Patent Description:
In the related art, a brake system equipped on a straddle-type vehicle has a hydraulic pressure control device mounted to the handlebar of the straddle-type vehicle. As for the brake system of the related art, a brake lever presses a master cylinder by a rider gripping the brake lever provided around the handlebar. Then, the pressure of the brake fluid that is supplied to the wheel cylinder of a vehicle wheel braking portion rises (see PTL <NUM>).

As for the straddle-type vehicle of the related art equipped with the brake system of the related art, a mechanical brake switch for brake lever posture detection is provided and a brake lamp is turned on based on the detection result of the brake switch. Specifically, the brake switch is provided near the brake lever, that is, near the handlebar. The brake switch is configured to be pressed by the brake lever with a rider gripping the brake lever with his or her hand. In addition, the brake switch is configured to output a signal when pressed or not pressed. In the straddle-type vehicle of the related art equipped with the brake system of the related art, the brake lamp is turned on after whether or not the brake is applied is determined based on the presence or absence of signal output from the brake switch.

In the straddle-type vehicle equipped with the brake system of the related art described above, the dedicated brake switch needs to be disposed near the handlebar so that whether or not the brake is applied is detected. In addition, in the straddle-type vehicle equipped with the brake system of the related art described above, a signal line connected to the brake switch needs to be routed near the handlebar. Accordingly, the brake system of the related art is problematic in that an increase in complexity arises around the handlebar of a straddle-type vehicle when the straddle-type vehicle is equipped with the brake system.

The present invention has been made in view of the above, and an object of the present invention is to obtain a hydraulic pressure control device mounted to the handlebar of a straddle-type vehicle and capable of suppressing an increase in complexity around the handlebar as compared with the related art when the straddle-type vehicle is equipped with a brake system including the hydraulic pressure control device. Another object of the present invention is to obtain a brake system provided with such a hydraulic pressure control device. Another object of the present invention is to obtain a straddle-type vehicle provided with such a brake system.

A hydraulic pressure control device according to the present invention is used in a brake system capable of executing anti-lock brake control and mounted to a handlebar of a straddle-type vehicle, as defined by independent claim <NUM>. The hydraulic pressure control device includes: a master cylinder-integrated base body where a piston mounting hole where a piston of a master cylinder is provided so as to be capable of reciprocating and an internal flow path as a part of a brake fluid flow path allowing the piston mounting hole and a wheel cylinder to communicate with each other are formed; a control valve opening and closing the internal flow path and adjusting pressure of a brake fluid supplied to the wheel cylinder from the master cylinder; a pressure sensor provided in the base body and detecting the pressure of the brake fluid between the control valve and the wheel cylinder in the internal flow path; and a control device controlling the opening and closing operation of the control valve based on a detection result of the pressure sensor, in which the control device is configured to output a control signal of a brake lamp of the straddle-type vehicle based on the detection result of the pressure sensor.

In addition, a brake system according to the present invention includes the hydraulic pressure control device according to the present invention.

In addition, a straddle-type vehicle according to the present invention includes the brake system according to the present invention.

The control device of the hydraulic pressure control device according to the present invention outputs the control signal of the brake lamp of the straddle-type vehicle based on the detection result of the pressure sensor used in controlling the pressure of the brake fluid supplied to the wheel cylinder. Accordingly, when the straddle-type vehicle is equipped with the brake system including the hydraulic pressure control device according to the present invention, a dedicated brake switch detecting whether or not the brake is applied is optional. Accordingly, a signal line connected to the brake switch is also optional when the straddle-type vehicle is equipped with the brake system including the hydraulic pressure control device according to the present invention. Accordingly, the hydraulic pressure control device according to the present invention is capable of suppressing an increase in complexity around the handlebar as compared with the related art when the straddle-type vehicle is equipped with the brake system including the hydraulic pressure control device.

Hereinafter, a hydraulic pressure control device according to the present invention, a brake system provided with the hydraulic pressure control device, and a straddle-type vehicle provided with the brake system will be described with reference to the drawings.

It should be noted that a case where the present invention is adopted for a bicycle (such as two-wheeled and three-wheeled vehicles) will be described below. Alternatively, the present invention may be adopted for a straddle-type vehicle other than a bicycle. The straddle-type vehicle means every vehicle ridden by a straddling rider. Examples of the straddle-type vehicle other than a bicycle include an automatic two-wheeled vehicle, an automatic three-wheeled vehicle, and a buggy using at least one of an engine and an electric motor as a drive source. In addition, the bicycle means every vehicle that can be propelled on the road by pedal effort. In other words, the bicycle includes ordinary, electrically assisted, and electric bicycles. In addition, the automatic two-wheeled or three-wheeled vehicle means a so-called motorcycle and the motorcycle includes an autobike, a scooter, and an electric scooter.

In addition, the following configuration, operation, and so on are examples and the hydraulic pressure control device, the brake system, and the straddle-type vehicle according to the present invention are not limited thereto. For example, in the following description, the brake system according to the present invention includes front wheel-side and rear wheel-side hydraulic pressure control devices for executing anti-lock brake control on front and rear wheels, respectively. However, the brake system according to the present invention may include only one of the front wheel-side hydraulic pressure control device and the rear wheel-side hydraulic pressure control device. In addition, the brake system according to the present invention may, for example, execute anti-lock brake control on both the front and rear wheels using one hydraulic pressure control device.

In addition, in the drawings, the same or similar members or parts are denoted by the same reference numerals or lack reference numerals. In addition, the illustration is simplified or omitted as appropriate regarding a detailed structure. In addition, redundant description is simplified or omitted as appropriate.

Equipping a bicycle with a brake system according to an embodiment will be described.

<FIG> is a side view illustrating a schematic configuration of the bicycle equipped with the brake system according to the embodiment of the present invention. <FIG> is a plan view illustrating the periphery of a handlebar of the bicycle equipped with the brake system according to the embodiment of the present invention. It should be noted that the left side of the page is the front of a bicycle <NUM> in <FIG>. In addition, in <FIG>, the upper side of the page is the front of the bicycle <NUM>. In addition, <FIG> illustrates a state where brake levers <NUM> are not gripped by a rider. In addition, in <FIG>, a front wheel-side hydraulic pressure control device <NUM> and a rear wheel-side hydraulic pressure control device <NUM> are illustrated in cross section in part.

The bicycle <NUM> equipped with a brake system <NUM> includes a frame <NUM>, a turning portion <NUM>, a saddle <NUM>, a pedal <NUM>, a rear wheel <NUM>, a rear wheel-side braking portion <NUM>, and a brake lamp <NUM>.

The frame <NUM> includes, for example, a head tube <NUM> axially supporting a steering column <NUM> of the turning portion <NUM>, a top tube <NUM> and a down tube <NUM> connected to the head tube <NUM>, a seat tube <NUM> connected to the top tube <NUM> and the down tube <NUM> and holding the saddle <NUM>, and a stay <NUM> connected to the upper and lower ends of the seat tube <NUM> and holding the rear wheel <NUM> and the rear wheel-side braking portion <NUM>.

The turning portion <NUM> includes, for example, the steering column <NUM>, a handle stem <NUM> held by the steering column <NUM>, a handlebar <NUM> held by the handle stem <NUM>, the brake levers <NUM> provided around the handlebar <NUM>, front forks <NUM> connected to the steering column <NUM>, a front wheel <NUM> rotatably held by the front forks <NUM>, and a front wheel-side braking portion <NUM>. The front forks <NUM> are provided on both sides of the front wheel <NUM>. One end of the front forks <NUM> is connected to the steering column <NUM>, and the other end of the front forks <NUM> is connected to the center of rotation of the front wheel <NUM>. In other words, the front wheel <NUM> is rotatably held between the pair of front forks <NUM>. It should be noted that the front fork <NUM> may be a front fork equipped with a suspension system.

The bicycle <NUM> according to the present embodiment includes the two brake levers <NUM>. Specifically, as illustrated in <FIG>, the brake system <NUM> includes the front wheel-side hydraulic pressure control device <NUM> for executing anti-lock brake control on the front wheel <NUM> and the rear wheel-side hydraulic pressure control device <NUM> for executing anti-lock brake control on the rear wheel <NUM>. The front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> include master cylinder-integrated base bodies <NUM> as will be described later. A hydraulic pressure control device provided with a master cylinder-integrated base body is mounted to a handlebar and has a configuration in which the piston of the master cylinder is pressed by a brake lever hand-gripped by a rider. Accordingly, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> are mounted to the handlebar <NUM>. The bicycle <NUM> includes the brake lever <NUM> for the front wheel-side hydraulic pressure control device <NUM> and the brake lever <NUM> for the rear wheel-side hydraulic pressure control device <NUM>.

In a case where both the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> are mounted to the handlebar <NUM>, one of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is provided around one grip portion <NUM> (grip portion <NUM> on the left side), which the rider grips with his or her left hand, of the handlebar <NUM>. In addition, the other of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is provided around the other grip portion <NUM> (grip portion <NUM> on the right side), which the rider grips with his or her right hand, of the handlebar <NUM>. Accordingly, when the bicycle <NUM> is equipped with the brake system <NUM> according to the present embodiment, the weight distribution of the attachment to the handlebar <NUM> in the left-right direction becomes more even than in the related art and the steerability of the bicycle <NUM> is improved as compared with the related art. It should be noted that <FIG> illustrates an example in which the rear wheel-side hydraulic pressure control device <NUM> is provided around the grip portion <NUM> that the rider grips with his or her left hand and the front wheel-side hydraulic pressure control device <NUM> is provided around the grip portion <NUM> that the rider grips with his or her right hand.

A power source unit <NUM> as a power source for the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is mounted to, for example, the down tube <NUM> of the frame <NUM>. The power source unit <NUM> may be a battery or a generator. Examples of the generator include a generator generating electricity by the bicycle <NUM> traveling (such as a hub dynamo generating electricity by the front wheel <NUM> or the rear wheel <NUM> rotating and a generator performing regenerative power generation as an electric motor of a drive source for the front wheel <NUM> or the rear wheel <NUM>) and a generator generating electricity from sunlight.

In other words, the bicycle <NUM> is equipped with the brake system <NUM> including at least the brake lever <NUM>, the front wheel-side braking portion <NUM>, the rear wheel-side braking portion <NUM>, the front wheel-side hydraulic pressure control device <NUM>, the rear wheel-side hydraulic pressure control device <NUM>, and the power source unit <NUM>. The brake system <NUM> is capable of executing anti-lock brake control on the front wheel <NUM> by controlling the pressure of the brake fluid of the front wheel-side braking portion <NUM> with the front wheel-side hydraulic pressure control device <NUM>. In addition, the brake system <NUM> is capable of executing anti-lock brake control on the rear wheel <NUM> by controlling the pressure of the brake fluid of the rear wheel-side braking portion <NUM> with the rear wheel-side hydraulic pressure control device <NUM>.

The brake lamp <NUM> emits light when at least one of the front wheel <NUM> and the rear wheel <NUM> is braked.

The configuration of the brake system according to the embodiment will be described.

<FIG> is a diagram illustrating a schematic configuration of the brake system according to the embodiment of the present invention.

As described above, the brake system <NUM> includes the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM>. The front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> include the master cylinder-integrated base bodies <NUM>. Specifically, as will be described in detail later, the base body <NUM> is formed with a piston mounting hole <NUM> where a piston <NUM> of a master cylinder <NUM> is provided so as to be capable of reciprocating. The master cylinder <NUM> is configured by the piston mounting hole <NUM> and the piston <NUM>. In addition, the base body <NUM> is formed with a wheel cylinder port <NUM> and an internal flow path <NUM> allowing the piston mounting hole <NUM> and the wheel cylinder port <NUM> to communicate with each other. In addition, the base body <NUM> is formed with a reservoir tank <NUM> for brake fluid storage connected to the piston mounting hole <NUM>.

The internal flow path <NUM> is a brake fluid flow path. The internal flow path <NUM> includes, for example, a first flow path <NUM>, a second flow path <NUM>, a third flow path <NUM>, and a fourth flow path <NUM>. The piston mounting hole <NUM> of the master cylinder <NUM> and the wheel cylinder port <NUM> communicate with each other via the first flow path <NUM> and the second flow path <NUM>. In addition, the inlet-side end portion of the third flow path <NUM> is connected to the middle portion of the second flow path <NUM>.

The front wheel-side braking portion <NUM> is connected via a liquid pipe <NUM> to the wheel cylinder port <NUM> of the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM>. The front wheel-side braking portion <NUM> includes a wheel cylinder <NUM> and a rotor <NUM>. The wheel cylinder <NUM> of the front wheel-side braking portion <NUM> is mounted to, for example, the front fork <NUM>. The wheel cylinder <NUM> of the front wheel-side braking portion <NUM> includes a piston portion (not illustrated) moving in conjunction with the pressure of the liquid pipe <NUM> and is connected to the outlet side of the second flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> via the liquid pipe <NUM> and the wheel cylinder port <NUM>. In other words, the wheel cylinder port <NUM> of the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM> is connected to the liquid pipe <NUM> communicating with the wheel cylinder <NUM> of the front wheel-side braking portion <NUM>. The rotor <NUM> of the front wheel-side braking portion <NUM> is held by the front wheel <NUM> and rotates together with the front wheel <NUM>. As a result of the movement of the piston portion of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM>, a brake pad (not illustrated) is pressed against the rotor <NUM> of the front wheel-side braking portion <NUM> and the front wheel <NUM> is braked.

The rear wheel-side braking portion <NUM> is connected via the liquid pipe <NUM> to the wheel cylinder port <NUM> of the base body <NUM> of the rear wheel-side hydraulic pressure control device <NUM>. The rear wheel-side braking portion <NUM> includes the wheel cylinder <NUM> and the rotor <NUM> as in the case of the front wheel-side braking portion <NUM>. The wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> is mounted to, for example, the stay <NUM>. The wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> includes a piston portion (not illustrated) moving in conjunction with the pressure of the liquid pipe <NUM> and is connected to the outlet side of the second flow path <NUM> of the rear wheel-side hydraulic pressure control device <NUM> via the liquid pipe <NUM> and the wheel cylinder port <NUM>. In other words, the wheel cylinder port <NUM> of the base body <NUM> of the rear wheel-side hydraulic pressure control device <NUM> is connected to the liquid pipe <NUM> communicating with the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM>. The rotor <NUM> of the rear wheel-side braking portion <NUM> is held by the rear wheel <NUM> and rotates together with the rear wheel <NUM>. As a result of the movement of the piston portion of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM>, a brake pad (not illustrated) is pressed against the rotor <NUM> of the rear wheel-side braking portion <NUM> and the rear wheel <NUM> is braked.

In other words, the internal flow path <NUM> formed in the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is a part of the brake fluid flow path that allows the piston mounting hole <NUM> and the wheel cylinder <NUM> to communicate with each other.

In addition, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> are provided with a control valve <NUM> opening and closing the internal flow path <NUM> and adjusting the pressure of the brake fluid supplied to the wheel cylinder <NUM>. The control valve <NUM> is provided in the base body <NUM>. In the present embodiment, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> include an inlet valve <NUM> and an outlet valve <NUM> as the control valve <NUM>.

The inlet valve <NUM> is provided between the outlet side of the first flow path <NUM> and the inlet side of the second flow path <NUM> and opens and closes the brake fluid flow between the first flow path <NUM> and the second flow path <NUM>. In other words, the inlet valve <NUM> opens and closes the part of the internal flow path <NUM> through which the brake fluid flowing from the piston mounting hole <NUM> to the wheel cylinder <NUM> passes. The outlet valve <NUM> is provided between the outlet side of the third flow path <NUM> and the inlet side of the fourth flow path <NUM> and opens and closes the brake fluid flow between the third flow path <NUM> and the fourth flow path <NUM>. The pressure of the brake fluid is controlled by the opening and closing operation of the inlet valve <NUM> and the outlet valve <NUM>.

In addition, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> include a first coil <NUM> as a drive source for the inlet valve <NUM> and a second coil <NUM> as a drive source for the outlet valve <NUM>. For example, when the first coil <NUM> is in a non-energized state, the inlet valve <NUM> opens the flow of the brake fluid in both directions. When the first coil <NUM> is energized, the inlet valve <NUM> is closed and shuts off the flow of the brake fluid. In other words, in the present embodiment, the inlet valve <NUM> is an electromagnetic valve that is open when not energized. In addition, the outlet valve <NUM> shuts off the flow of the brake fluid when, for example, the second coil <NUM> is in a non-energized state. When the second coil <NUM> is energized, the outlet valve <NUM> is opened and opens the flow of the brake fluid in both directions. In other words, in the present embodiment, the outlet valve <NUM> is an electromagnetic valve that is closed when not energized.

In addition, an accumulator <NUM> is formed in the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM>. The accumulator <NUM> is connected to the outlet side of the fourth flow path <NUM> and stores the brake fluid that has passed through the outlet valve <NUM>. In other words, the outlet valve <NUM> opens and closes the part of the internal flow path <NUM> through which the brake fluid flowing from the wheel cylinder <NUM> to the accumulator <NUM> passes.

In addition, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> include a pressure sensor <NUM> detecting the pressure of the brake fluid in the internal flow path <NUM>. The pressure sensor <NUM> is provided in the base body <NUM>. In the present embodiment, the pressure sensor <NUM> detects the pressure of the brake fluid that applies pressure to the wheel cylinder <NUM>. For example, the pressure sensor <NUM> communicates with the second flow path <NUM>.

In addition, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> include a control device <NUM> controlling the opening and closing operation of the control valve <NUM> based on the detection result of the pressure sensor <NUM>. It should be noted that each unit of the control device <NUM> may be arranged together or dispersedly. In addition, at least a part of the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and at least a part of the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> may be arranged together. The control device <NUM> may be configured to include, for example, a microcomputer and a microprocessor unit, may be configured to include what is updatable such as firmware, or may be configured to include, for example, a program module executed by a command from a CPU or the like. For example, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is configured as follows.

<FIG> is a block diagram illustrating the front wheel-side hydraulic pressure control device according to the embodiment of the present invention. In addition, <FIG> is a block diagram illustrating the rear wheel-side hydraulic pressure control device according to the embodiment of the present invention.

The detection result of the pressure sensor <NUM> is input to the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM>. In addition, in the present embodiment, the detection result of a front wheel-side vehicle wheel speed sensor <NUM> detecting the rotation speed of the front wheel <NUM> as a detection device detecting information on the traveling state of the bicycle <NUM> is input to the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM>. Then, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> determines whether the front wheel <NUM> is locked or the possibility of the front wheel <NUM> being locked based on the detection result of the front wheel-side vehicle wheel speed sensor <NUM>. In addition, in the present embodiment, the detection result of a rear wheel-side vehicle wheel speed sensor <NUM> detecting the rotation speed of the rear wheel <NUM> as a detection device detecting information on the traveling state of the bicycle <NUM> is input to the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM>. Then, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> determines whether the rear wheel <NUM> is locked or the possibility of the rear wheel <NUM> being locked based on the detection result of the rear wheel-side vehicle wheel speed sensor <NUM>.

The control device <NUM> includes an operation determination unit <NUM> and a control unit <NUM> as functional units. The operation determination unit <NUM> is a functional unit determining the opening and closing operation of the control valve <NUM>. Specifically, the operation determination unit <NUM> determines whether to open or close the inlet valve <NUM>. In addition, the operation determination unit <NUM> determines whether to open or close the outlet valve <NUM>. The control unit <NUM> is a functional unit controlling the opening and closing operation of the control valve <NUM>. Specifically, the control unit <NUM> controls the energization of the first coil <NUM> to turn the state of the inlet valve <NUM> into the state determined by the operation determination unit <NUM>. In addition, the control unit <NUM> controls the energization of the second coil <NUM> to turn the state of the outlet valve <NUM> into the state determined by the operation determination unit <NUM>.

In other words, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> controls the pressure of the brake fluid supplied to the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> and controls the braking force of the front wheel <NUM> by controlling the opening and closing operation of the inlet valve <NUM> and the outlet valve <NUM> of the front wheel-side hydraulic pressure control device <NUM>. In other words, the front wheel-side hydraulic pressure control device <NUM> controls the pressure of the brake fluid supplied to the wheel cylinder <NUM> of the front wheel-side braking portion <NUM>. In addition, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> controls the pressure of the brake fluid supplied to the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> and controls the braking force of the rear wheel <NUM> by controlling the opening and closing operation of the inlet valve <NUM> and the outlet valve <NUM> of the rear wheel-side hydraulic pressure control device <NUM>. In other words, the rear wheel-side hydraulic pressure control device <NUM> controls the pressure of the brake fluid supplied to the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM>.

For example, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> operates as follows. The braking of the front wheel <NUM> is initiated when the rider grips the brake lever <NUM> and the piston <NUM> of the master cylinder <NUM> of the front wheel-side hydraulic pressure control device <NUM> is pressed by the brake lever <NUM>. With the front wheel <NUM> braked, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> initiates anti-lock brake control when it is determined based on the detection result of the front wheel-side vehicle wheel speed sensor <NUM> that the front wheel <NUM> is or may be locked.

With the anti-lock brake control initiated, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> energizes the first coil <NUM>, closes the inlet valve <NUM>, and shuts off the brake fluid flow from the master cylinder <NUM> to the wheel cylinder <NUM> of the front wheel-side braking portion <NUM>. As a result, an increase in the pressure of the brake fluid of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> is suppressed. Meanwhile, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> energizes the second coil <NUM>, opens the outlet valve <NUM>, and allows the brake fluid to flow from the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> to the accumulator <NUM>. As a result, the pressure of the brake fluid of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> decreases. As a result, the lock of the front wheel <NUM> is released or avoided. When it is determined from the detection result of the pressure sensor <NUM> that the pressure of the brake fluid of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> has decreased to a predetermined value, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> closes the outlet valve <NUM> by de-energizing the second coil <NUM>, opens the inlet valve <NUM> by de-energizing the first coil <NUM> for a short time, and increases the pressure of the brake fluid of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM>. The control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> may increase or decrease the pressure of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> only once or may repeat the increase or decrease a plurality of times.

Here, as described above, the pressure sensor <NUM> detects the pressure of the brake fluid that is in the internal flow path <NUM> and applies pressure to the wheel cylinder <NUM>. Accordingly, the pressure sensor <NUM> is capable of directly detecting the brake fluid of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM>. Accordingly, by the pressure sensor <NUM> detecting the pressure of the brake fluid applying pressure to the wheel cylinder <NUM>, the front wheel-side hydraulic pressure control device <NUM> is capable of performing anti-lock brake control on the front wheel <NUM> with high accuracy.

With the anti-lock brake control completed and the brake lever <NUM> corresponding to the front wheel-side hydraulic pressure control device <NUM> returned, the inside of the master cylinder <NUM> of the front wheel-side hydraulic pressure control device <NUM> reaches atmospheric pressure and the brake fluid in the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> is returned. In addition, the front wheel-side hydraulic pressure control device <NUM> opens the outlet valve <NUM> with the anti-lock brake control completed and the brake lever <NUM> corresponding to the front wheel-side hydraulic pressure control device <NUM> returned. When the pressure of the brake fluid in the internal flow path <NUM> becomes lower than the pressure of the brake fluid stored in the accumulator <NUM> as a result, the brake fluid stored in the accumulator <NUM> is discharged to the outside of the accumulator <NUM> pumplessly (that is, without boosting). Then, the brake fluid discharged to the outside the accumulator <NUM> returns to the master cylinder <NUM> through the fourth flow path <NUM>, the outlet valve <NUM>, the third flow path <NUM>, the second flow path <NUM>, and the first flow path <NUM>. In addition, the surplus brake fluid that has returned to the master cylinder <NUM> is stored in the reservoir tank <NUM>.

Likewise, for example, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> operates as follows. The braking of the rear wheel <NUM> is initiated when the rider grips the brake lever <NUM> and the piston <NUM> of the master cylinder <NUM> of the rear wheel-side hydraulic pressure control device <NUM> is pressed by the brake lever <NUM>. With the rear wheel <NUM> braked, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> initiates anti-lock brake control when it is determined based on the detection result of the rear wheel-side vehicle wheel speed sensor <NUM> that the rear wheel <NUM> is or may be locked.

With the anti-lock brake control initiated, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> energizes the first coil <NUM>, closes the inlet valve <NUM>, and shuts off the brake fluid flow from the master cylinder <NUM> to the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM>. As a result, an increase in the pressure of the brake fluid of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> is suppressed. Meanwhile, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> energizes the second coil <NUM>, opens the outlet valve <NUM>, and allows the brake fluid to flow from the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> to the accumulator <NUM>. As a result, the pressure of the brake fluid of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> decreases. As a result, the lock of the rear wheel <NUM> is released or avoided. When it is determined from the detection result of the pressure sensor <NUM> that the pressure of the brake fluid of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> has decreased to a predetermined value, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> closes the outlet valve <NUM> by de-energizing the second coil <NUM>, opens the inlet valve <NUM> by de-energizing the first coil <NUM> for a short time, and increases the pressure of the brake fluid of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM>. The control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> may increase or decrease the pressure of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> only once or may repeat the increase or decrease a plurality of times.

Here, as described above, the pressure sensor <NUM> detects the pressure of the brake fluid that is in the internal flow path <NUM> and applies pressure to the wheel cylinder <NUM>. Accordingly, the pressure sensor <NUM> is capable of directly detecting the brake fluid of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM>. Accordingly, by the pressure sensor <NUM> detecting the pressure of the brake fluid applying pressure to the wheel cylinder <NUM>, the rear wheel-side hydraulic pressure control device <NUM> is capable of performing anti-lock brake control on the rear wheel <NUM> with high accuracy.

With the anti-lock brake control completed and the brake lever <NUM> corresponding to the rear wheel-side hydraulic pressure control device <NUM> returned, the inside of the master cylinder <NUM> of the rear wheel-side hydraulic pressure control device <NUM> reaches atmospheric pressure and the brake fluid in the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> is returned. In addition, the rear wheel-side hydraulic pressure control device <NUM> opens the outlet valve <NUM> with the anti-lock brake control completed and the brake lever <NUM> corresponding to the rear wheel-side hydraulic pressure control device <NUM> returned. When the pressure of the brake fluid in the internal flow path <NUM> becomes lower than the pressure of the brake fluid stored in the accumulator <NUM> as a result, the brake fluid stored in the accumulator <NUM> is pumplessly discharged to the outside of the accumulator <NUM>. Then, the brake fluid discharged to the outside the accumulator <NUM> returns to the master cylinder <NUM> through the fourth flow path <NUM>, the outlet valve <NUM>, the third flow path <NUM>, the second flow path <NUM>, and the first flow path <NUM>. In addition, the surplus brake fluid that has returned to the master cylinder <NUM> is stored in the reservoir tank <NUM>.

As described above, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> have a configuration in which the brake fluid released from the wheel cylinder <NUM> during the pressure decrease in the anti-lock brake control is stored in the accumulator <NUM> and the brake fluid in the accumulator <NUM> is pumplessly discharged to the outside of the accumulator <NUM>. The front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> configured as described above can be reduced in size as compared with a hydraulic pressure control device discharging the brake fluid in an accumulator to the outside of the accumulator using a pump, and the degree of freedom of mounting on the bicycle <NUM> is improved.

Here, in the hydraulic pressure control device of the related art that pumplessly discharges the brake fluid in the accumulator to the outside of the accumulator, the internal flow path returns the brake fluid in the accumulator to the master cylinder without passage through the outlet valve. The internal flow path of the hydraulic pressure control device of the related art includes a bypass flow path, one end of the bypass flow path is connected to the accumulator, and the other end of the bypass flow path is connected to the flow path between the master cylinder and the inlet valve. In addition, the bypass flow path of the internal flow path of the hydraulic pressure control device of the related art is provided with a check valve regulating the flow of the brake fluid from the master cylinder side to the accumulator side in order to prevent the brake fluid from flowing into the accumulator through the bypass flow path. On the other hand, the internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> has a configuration in which the brake fluid in the accumulator <NUM> cannot be returned to the master cylinder <NUM> without passage through the outlet valve <NUM>. In other words, the internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> has a configuration in which the brake fluid in the accumulator <NUM> cannot be returned to the piston mounting hole <NUM> (one configuration of the master cylinder <NUM>) formed in the base body <NUM> without passage through the outlet valve <NUM>. The internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> configured as described above does not require the bypass flow path and the check valve of the hydraulic pressure control device of the related art. Accordingly, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> configured as described above can be further reduced in size and the degree of freedom of mounting on the bicycle <NUM> is further improved.

It should be noted that at least a part of the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is configured as a control board <NUM> in the present embodiment. Specifically, in the present embodiment, the components of the operation determination unit <NUM> and the control unit <NUM> of the control device <NUM> are configured as the control board <NUM>. In other words, the control board <NUM> controls the opening and closing operation of the control valve <NUM>. In other words, the control board <NUM> is electrically connected to the first coil <NUM> and the second coil <NUM> and controls the energization of the first coil <NUM> and the second coil <NUM>.

Here, in the present embodiment, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> includes a signal output unit <NUM> as a functional unit outputting a control signal of the brake lamp <NUM> based on the detection result of the pressure sensor <NUM>. In other words, in the present embodiment, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is configured to output the control signal of the brake lamp <NUM> based on the detection result of the pressure sensor <NUM>.

Specifically, when the rider grips the brake lever <NUM> in order to brake the front wheel <NUM> and the piston <NUM> of the master cylinder <NUM> of the front wheel-side hydraulic pressure control device <NUM> is pressed by the brake lever <NUM>, the pressure of the brake fluid in the internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> rises as compared with a state where the brake lever <NUM> is not gripped by the rider. In other words, when the rider grips the brake lever <NUM> and the piston <NUM> of the master cylinder <NUM> of the front wheel-side hydraulic pressure control device <NUM> is pressed by the brake lever <NUM>, the pressure detected by the pressure sensor <NUM> of the front wheel-side hydraulic pressure control device <NUM> rises as compared with a state where the brake lever <NUM> is not gripped by the rider. At that time, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> outputs the control signal of the brake lamp <NUM>. Then, the bicycle <NUM> turns on the brake lamp <NUM> upon receiving the control signal of the brake lamp <NUM> output from the front wheel-side hydraulic pressure control device <NUM>.

Likewise, when the rider grips the brake lever <NUM> in order to brake the rear wheel <NUM> and the piston <NUM> of the master cylinder <NUM> of the rear wheel-side hydraulic pressure control device <NUM> is pressed by the brake lever <NUM>, the pressure of the brake fluid in the internal flow path <NUM> of the rear wheel-side hydraulic pressure control device <NUM> rises as compared with a state where the brake lever <NUM> is not gripped by the rider. In other words, when the rider grips the brake lever <NUM> and the piston <NUM> of the master cylinder <NUM> of the rear wheel-side hydraulic pressure control device <NUM> is pressed by the brake lever <NUM>, the pressure detected by the pressure sensor <NUM> of the rear wheel-side hydraulic pressure control device <NUM> rises as compared with a state where the brake lever <NUM> is not gripped by the rider. At that time, the control device <NUM> of the rear wheel-side hydraulic pressure control device <NUM> outputs the control signal of the brake lamp <NUM>. Then, the bicycle <NUM> turns on the brake lamp <NUM> upon receiving the control signal of the brake lamp <NUM> output from the rear wheel-side hydraulic pressure control device <NUM>.

In a straddle-type vehicle equipped with the hydraulic pressure control device of the related art in which the piston of the master cylinder is pressed by the brake lever gripped by a rider, a mechanical brake switch for brake lever posture detection is provided and the brake lamp is turned on based on the detection result of the brake switch. Specifically, the brake switch is provided near the brake lever, that is, near the handlebar. The brake switch is configured to be pressed by the brake lever with a rider gripping the brake lever with his or her hand. In addition, the brake switch is configured to output a signal when pressed or not pressed. In the straddle-type vehicle equipped with the hydraulic pressure control device of the related art, the brake lamp is turned on after whether or not the brake is applied is determined based on the presence or absence of signal output from the brake switch.

As described above, in the straddle-type vehicle equipped with the hydraulic pressure control device of the related art described above, a dedicated brake switch needs to be disposed near the handlebar so that whether or not the brake is applied is detected. In addition, in the straddle-type vehicle equipped with the hydraulic pressure control device of the related art described above, a signal line connected to the brake switch needs to be routed near the handlebar. Accordingly, an increase in complexity arises around the handlebar when the straddle-type vehicle is equipped with the hydraulic pressure control device of the related art described above, that is, the brake system provided with the hydraulic pressure control device.

On the other hand, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment outputs the control signal of the brake lamp <NUM> of the bicycle <NUM> based on the detection result of the pressure sensor <NUM> used in controlling the pressure of the brake fluid supplied to the wheel cylinder <NUM>. Accordingly, when the bicycle <NUM> is equipped with the brake system <NUM> including the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM>, a dedicated brake switch detecting whether or not the brake is applied is unnecessary. Accordingly, a signal line connected to the brake switch is also unnecessary when the bicycle <NUM> is equipped with the brake system <NUM> including the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM>. Accordingly, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment are capable of suppressing an increase in complexity around the handlebar <NUM> as compared with the related art when the bicycle <NUM> is equipped with the brake system <NUM>.

In addition, the mechanical brake switch is fragile. In addition, in a case where the signal line connected to the brake switch is routed near the handlebar, the rider's hand or the like is likely to be caught in the signal line. In view of this point, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment do not require a brake switch and a signal line connected to the brake switch, and thus the reliability of the bicycle <NUM> is also improved.

In addition, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment are easily mounted to the bicycle <NUM> and the degree of freedom of mounting on the bicycle <NUM> is improved since an increase in complexity around the handlebar <NUM> can be suppressed as compared with the related art. In addition, the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment is integrated with the master cylinder. In a case where the master cylinder <NUM> and the base body <NUM> are separate bodies, piping such as a liquid pipe connecting the master cylinder <NUM> and the base body <NUM> needs to be routed near the handlebar <NUM>. On the other hand, in a case where the base body <NUM> is a master cylinder-integrated base body, piping such as the liquid pipe does not have to be routed near the handlebar <NUM>. Accordingly, with the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment, the degree of freedom of mounting on the bicycle <NUM> is further improved and the reliability of the bicycle <NUM> is also further improved as compared with a case where the master cylinder <NUM> and the base body <NUM> are separate bodies.

In addition, in the present embodiment, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> outputs the control signal of the brake lamp <NUM> in the event of a decrease in the pressure of the brake fluid in the internal flow path <NUM> attributable to a change in the opening and closing state of the control valve <NUM>. In other words, the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> outputs the control signal of the brake lamp <NUM> when the pressure of the brake fluid of the wheel cylinder <NUM> has decreased as a result of anti-lock brake control. The control signal of the brake lamp <NUM> at the time when the pressure of the brake fluid of the wheel cylinder <NUM> has decreased as a result of the anti-lock brake control is a signal that can be distinguished from the control signal of the brake lamp <NUM> in a case where no anti-lock brake control is performed. As a result, how the brake lamp <NUM> of the bicycle <NUM> emits light can be changed depending on, for example, whether or not anti-lock brake control is performed during braking. For example, during braking, the bicycle <NUM> turns on the brake lamp <NUM> when no anti-lock brake control is performed and causes the brake lamp <NUM> to blink when anti-lock brake control is performed. By changing how the brake lamp <NUM> emits light depending on whether or not anti-lock brake control is performed during the braking of the bicycle <NUM> as described above, a vehicle traveling behind the bicycle <NUM> or the like is capable of knowing that the braking force of the bicycle <NUM> has changed. Accordingly, the safety of the bicycle <NUM> is improved by the control signal of the brake lamp <NUM> being output in the event of a decrease in the pressure of the brake fluid in the internal flow path <NUM> attributable to a change in the opening and closing state of the control valve <NUM>. It should be noted that the control signal of the brake lamp <NUM> output from the control device <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> may be used for control other than the light emission from the brake lamp <NUM>.

In addition, as illustrated in <FIG>, the brake lever <NUM> in the brake system <NUM> according to the present embodiment is in contact with the piston <NUM> of the master cylinder <NUM> in a state where the rider does not grip the brake lever <NUM> with his or her hand. Accordingly, when the rider begins to grip the brake lever <NUM>, the piston <NUM> of the master cylinder <NUM> immediately begins to be pressed by the brake lever <NUM>. In other words, when the rider begins to grip the brake lever <NUM>, the pressure of the brake fluid in the internal flow path <NUM> immediately begins to rise. Accordingly, in the brake system <NUM> configured in this manner, the delay between the initiation of the braking of the bicycle <NUM> by the rider and the light emission from the brake lamp <NUM> can be suppressed and the safety of the bicycle <NUM> is improved.

The configuration of the hydraulic pressure control device of the brake system according to the embodiment will be described.

It should be noted that the brake system <NUM> according to the present embodiment includes two hydraulic pressure control devices (the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM>). When the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> are mounted to the handlebar <NUM> of the bicycle <NUM>, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> have a shape that is inverted in the left-right direction. Accordingly, the front wheel-side hydraulic pressure control device <NUM> will be described below. In other words, the rear wheel-side hydraulic pressure control device <NUM> is the front wheel-side hydraulic pressure control device <NUM> that is inverted in the left-right direction. By the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> having the shape inverted in the left-right direction, the design of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is facilitated.

In addition, the configuration of the front wheel-side hydraulic pressure control device <NUM> will be described below while observing the front wheel-side hydraulic pressure control device <NUM> in a state where the front wheel-side hydraulic pressure control device <NUM> is mounted to the handlebar <NUM> of the bicycle <NUM> and the bicycle <NUM> travels straight.

<FIG> is a perspective view illustrating the front wheel-side hydraulic pressure control device according to the embodiment of the present invention. <FIG> is a perspective view in which the front wheel-side hydraulic pressure control device <NUM> is observed from the rear right side of the front wheel-side hydraulic pressure control device <NUM>. <FIG> is a vertical cross-sectional view of the front wheel-side hydraulic pressure control device according to the embodiment of the present invention. <FIG> is a bottom view illustrating the base body of the front wheel-side hydraulic pressure control device according to the embodiment of the present invention.

The front wheel-side hydraulic pressure control device <NUM> will be described below with reference to <FIG> and the above drawings.

The base body <NUM> of the front wheel-side hydraulic pressure control device <NUM> is, for example, a substantially rectangular parallelepiped member made of an aluminum alloy. It should be noted that each surface of the base body <NUM> may be flat, may include a curved portion, or may include a step. The reservoir tank <NUM>, an inlet valve mounting hole <NUM>, an outlet valve mounting hole <NUM>, the wheel cylinder port <NUM>, and the piston mounting hole <NUM> of the master cylinder <NUM> are formed in the base body <NUM>.

The reservoir tank <NUM> is formed in the base body <NUM> so as to be open on a first surface <NUM>. In other words, an opening portion <NUM> of the reservoir tank <NUM> is formed on the first surface <NUM>. The front wheel-side hydraulic pressure control device <NUM> is mounted to the bicycle <NUM> such that the opening portion <NUM> of the reservoir tank <NUM> is the upper portion of the reservoir tank <NUM> so that the inside of the reservoir tank <NUM> is maintained at atmospheric pressure. Accordingly, the first surface <NUM> is the upper surface of the base body <NUM>. It should be noted that the opening portion <NUM> of the reservoir tank <NUM> is covered with a lid <NUM>.

The inlet valve mounting hole <NUM> is a hole where the inlet valve <NUM> is provided so as to be capable of reciprocating. The inlet valve mounting hole <NUM> is formed in the base body <NUM> so as to be open on a second surface <NUM>, which is opposite to the first surface <NUM>. In other words, an opening portion <NUM> of the inlet valve mounting hole <NUM> is formed in the second surface <NUM>. The second surface <NUM> is the lower surface of the base body <NUM>. The inlet valve mounting hole <NUM> is formed in the base body <NUM> along, for example, the vertical direction. The first flow path <NUM> and the second flow path <NUM> of the internal flow path <NUM> illustrated in <FIG> communicate with the inlet valve mounting hole <NUM>. The flow of the brake fluid between the first flow path <NUM> and the second flow path <NUM> is opened and closed by the inlet valve <NUM> reciprocating in the inlet valve mounting hole <NUM>.

The outlet valve mounting hole <NUM> is a hole where the outlet valve <NUM> is provided so as to be capable of reciprocating. The outlet valve mounting hole <NUM> is formed in the base body <NUM> so as to be open on the second surface <NUM>. In other words, an opening portion <NUM> of the outlet valve mounting hole <NUM> is formed in the second surface <NUM>. The outlet valve mounting hole <NUM> is formed in the base body <NUM> along, for example, the vertical direction. The third flow path <NUM> and the fourth flow path <NUM> of the internal flow path <NUM> illustrated in <FIG> communicate with the outlet valve mounting hole <NUM>. The flow of the brake fluid between the third flow path <NUM> and the fourth flow path <NUM> is opened and closed by the outlet valve <NUM> reciprocating in the outlet valve mounting hole <NUM>.

As described above, the piston <NUM> of the master cylinder <NUM> is provided in the piston mounting hole <NUM> of the master cylinder <NUM> so as to be capable of reciprocating. The piston mounting hole <NUM> is formed in the base body <NUM> so as to be open on a third surface <NUM> connecting the first surface <NUM> and the second surface <NUM>. In other words, an opening portion <NUM> of the piston mounting hole <NUM> is formed in the third surface <NUM>. The third surface <NUM> is a side surface of the base body <NUM>. More specifically, in the case of the front wheel-side hydraulic pressure control device <NUM> provided around the grip portion <NUM> on the right side of the handlebar <NUM>, the third surface <NUM> is the right side surface of the base body <NUM>. In addition, in the case of the rear wheel-side hydraulic pressure control device <NUM> provided around the grip portion <NUM> on the left side of the handlebar <NUM>, the third surface <NUM> is the left side surface of the base body <NUM>.

The master cylinder <NUM> extends along the range of the handlebar <NUM> facing the master cylinder <NUM> in a plan view. In other words, in a plan view, the master cylinder <NUM> is formed on the base body <NUM> so as to extend substantially in the left-right direction. The wheel cylinder port <NUM> is formed in the base body <NUM> so as to be open on a fourth surface <NUM>, which is opposite to the third surface <NUM>.

In a state where the inlet valve <NUM> is provided in the inlet valve mounting hole <NUM>, a part of the inlet valve <NUM> protrudes from the opening portion <NUM> of the inlet valve mounting hole <NUM> to the outside of the inlet valve mounting hole <NUM>. In other words, in a state where the inlet valve <NUM> is provided in the inlet valve mounting hole <NUM>, a part of the inlet valve <NUM> protrudes downward from the second surface <NUM> of the base body <NUM>. The first coil <NUM>, which is the drive source for the inlet valve <NUM>, is provided so as to surround the part of the inlet valve <NUM> that protrudes downward beyond the base body <NUM>. In addition, the first coil <NUM> is electrically connected to the control board <NUM> via a terminal <NUM>.

In a state where the outlet valve <NUM> is provided in the outlet valve mounting hole <NUM>, a part of the outlet valve <NUM> protrudes from the opening portion <NUM> of the outlet valve mounting hole <NUM> to the outside of the outlet valve mounting hole <NUM>. In other words, in a state where the outlet valve <NUM> is provided in the outlet valve mounting hole <NUM>, a part of the outlet valve <NUM> protrudes downward from the second surface <NUM> of the base body <NUM>. The second coil <NUM>, which is the drive source for the outlet valve <NUM>, is provided so as to surround the part of the outlet valve <NUM> that protrudes downward beyond the base body <NUM>. In addition, the second coil <NUM> is electrically connected to the control board <NUM> via a terminal <NUM>.

The first coil <NUM>, the second coil <NUM>, and the control board <NUM> are stored in a housing <NUM> included in the front wheel-side hydraulic pressure control device <NUM>. The housing <NUM> is connected to the base body <NUM>. The housing <NUM> storing the first coil <NUM>, the second coil <NUM>, and the control board <NUM> disposed below the base body <NUM> is also disposed below the base body <NUM>.

In the hydraulic pressure control device of the related art provided with the master cylinder-integrated base body, the inlet valve mounting hole and the outlet valve mounting hole are formed in the base body so as to extend in a substantially horizontal direction with the hydraulic pressure control device mounted to the handlebar. In other words, in the hydraulic pressure control device of the related art provided with the master cylinder-integrated base body, the inlet valve mounting hole and the outlet valve mounting hole are open to the front, rear, or side of the straddle-type vehicle when the hydraulic pressure control device is mounted to the handlebar. Here, the housing storing the coil as the inlet valve drive source, the coil as the outlet valve drive source, and the control board controlling the energization of the coils is disposed so as to face the surface of the base body where the inlet valve mounting hole and the outlet valve mounting hole are open. In other words, as for the hydraulic pressure control device of the related art provided with the master cylinder-integrated base body, it is imperative to ensure a housing disposition space in front of, behind, or beside the hydraulic pressure control device in mounting the hydraulic pressure control device on the handlebar. However, the straddle-type vehicle is provided with the handlebar behind the mounting position of the hydraulic pressure control device. In addition, as for the straddle-type vehicle, various objects are also provided in front of and beside the mounting position of the hydraulic pressure control device. Accordingly, the hydraulic pressure control device of the related art provided with the master cylinder-integrated base body has a low degree of freedom of mounting on a straddle-type vehicle.

On the other hand, in the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM> according to the present embodiment, the inlet valve mounting hole <NUM> and the outlet valve mounting hole <NUM> are formed on the second surface <NUM>, which is the lower surface when the front wheel-side hydraulic pressure control device <NUM> is mounted to the handlebar <NUM> of the bicycle <NUM>. Accordingly, when the front wheel-side hydraulic pressure control device <NUM> according to the present embodiment is mounted to the handlebar <NUM> of the bicycle <NUM>, the first coil <NUM>, the second coil <NUM>, the control board <NUM>, and the housing <NUM> are disposed below the base body <NUM>. Here, in the straddle-type vehicle, there is a spatial margin in the vertical direction around the mounting position of the hydraulic pressure control device as compared with the front, rear, and side. Accordingly, the degree of freedom of mounting on the bicycle <NUM> is improved as compared with the related art with the front wheel-side hydraulic pressure control device <NUM> according to the present embodiment, that is, the rear wheel-side hydraulic pressure control device <NUM> according to the present embodiment.

Here, as is apparent from <FIG>, the direction of arrangement of the opening portion <NUM> of the inlet valve mounting hole <NUM> and the opening portion <NUM> of the outlet valve mounting hole <NUM> on the second surface <NUM> is along the direction of extension of the piston mounting hole <NUM> (direction in which the piston mounting hole <NUM> extends). Specifically, when the front wheel-side hydraulic pressure control device <NUM> mounted to the handlebar <NUM> of the bicycle <NUM> is observed from above or below, the direction of arrangement of the opening portion <NUM> of the inlet valve mounting hole <NUM> and the opening portion <NUM> of the outlet valve mounting hole <NUM> on the second surface <NUM> is along the direction of extension of the piston mounting hole <NUM> (direction in which the piston mounting hole <NUM> extends). It should be noted that "along" expressed in the present embodiment does not mean that two compared directions are exactly parallel. The two compared directions may be slightly tilted. For example, the inclination of the two directions may be less than <NUM>°.

In general, a hydraulic pressure control device provided with a master cylinder-integrated base body becomes large in the direction of extension of a piston mounting hole. In addition, in a straddle-type vehicle, there is a spatial margin around the mounting position of the hydraulic pressure control device in the left-right direction as compared with the front-rear direction. In other words, around the mounting position of the hydraulic pressure control device on the straddle-type vehicle, the spatial margin in the front-rear direction is the least of those in the front-rear, left-right, and vertical directions. Accordingly, in general, a hydraulic pressure control device provided with a master cylinder-integrated base body is mounted to the handlebar of a straddle-type vehicle such that the direction of extension of a piston mounting hole is along the left-right direction of the straddle-type vehicle in a plan view. In other words, in general, a hydraulic pressure control device provided with a master cylinder-integrated base body is mounted to the handlebar of a straddle-type vehicle such that the direction of extension of a piston mounting hole is along the handlebar in a plan view. As illustrated in <FIG>, the same applies to the front wheel-side hydraulic pressure control device <NUM> according to the present embodiment. At this time, the front wheel-side hydraulic pressure control device <NUM> having a configuration in which the direction of arrangement of the opening portion <NUM> of the inlet valve mounting hole <NUM> and the opening portion <NUM> of the outlet valve mounting hole <NUM> on the second surface <NUM> is along the direction of extension of the piston mounting hole <NUM> is capable of suppressing the width in the front-rear direction, in which the spatial margin is the least at the mounting position of the front wheel-side hydraulic pressure control device <NUM> of the bicycle <NUM>. Accordingly, the degree of freedom of mounting on the bicycle <NUM> is further improved with the front wheel-side hydraulic pressure control device <NUM> having the configuration, that is, the rear wheel-side hydraulic pressure control device <NUM> having the configuration.

As described above, in the present embodiment, the front wheel-side hydraulic pressure control device <NUM> includes the pressure sensor <NUM>. The pressure sensor <NUM> is provided in a pressure sensor mounting hole <NUM> formed in the base body <NUM>. The pressure sensor mounting hole <NUM> is formed in the base body <NUM> so as to be open on the second surface <NUM>. In other words, an opening portion <NUM> of the pressure sensor mounting hole <NUM> is formed in the second surface <NUM>. The pressure sensor mounting hole <NUM> is formed in the base body <NUM> along, for example, the vertical direction. The pressure sensor <NUM> and the control board <NUM> can be connected in the front-rear direction by the opening portion <NUM> of the pressure sensor mounting hole <NUM> being formed in the second surface <NUM>. Accordingly, by the opening portion <NUM> of the pressure sensor mounting hole <NUM> being formed in the second surface <NUM>, the front wheel-side hydraulic pressure control device <NUM> becoming large in the front-rear direction and the left-right direction can be suppressed even in a case where the pressure sensor <NUM> is provided in the base body <NUM>. Accordingly, as for the front wheel-side hydraulic pressure control device <NUM> in which the opening portion <NUM> of the pressure sensor mounting hole <NUM> is formed in the second surface <NUM>, that is, the rear wheel-side hydraulic pressure control device <NUM> in which the opening portion <NUM> of the pressure sensor mounting hole <NUM> is formed in the second surface <NUM>, the degree of freedom of mounting on the bicycle <NUM> is improved as compared with the related art even in a case where the pressure sensor <NUM> is provided in the base body <NUM>.

In addition, as is apparent from <FIG>, the direction of arrangement of the opening portion <NUM> of the inlet valve mounting hole <NUM>, the opening portion <NUM> of the outlet valve mounting hole <NUM>, and the opening portion <NUM> of the pressure sensor mounting hole <NUM> on the second surface <NUM> is along the direction of extension of the piston mounting hole <NUM> (direction in which the piston mounting hole <NUM> extends). Specifically, when the front wheel-side hydraulic pressure control device <NUM> mounted to the handlebar <NUM> of the bicycle <NUM> is observed from above or below, the direction of arrangement of the opening portion <NUM> of the inlet valve mounting hole <NUM>, the opening portion <NUM> of the outlet valve mounting hole <NUM>, and the opening portion <NUM> of the pressure sensor mounting hole <NUM> on the second surface <NUM> is along the direction of extension of the piston mounting hole <NUM> (direction in which the piston mounting hole <NUM> extends). The front wheel-side hydraulic pressure control device <NUM> configured as described above is capable of suppressing the width in the front-rear direction, in which the spatial margin is the least at the mounting position of the front wheel-side hydraulic pressure control device <NUM> of the bicycle <NUM>, when the base body <NUM> is provided with the pressure sensor <NUM>. Accordingly, with the front wheel-side hydraulic pressure control device <NUM> configured as described above, that is, the rear wheel-side hydraulic pressure control device <NUM> configured as described above, the degree of freedom of mounting on the bicycle <NUM> is further improved when the base body <NUM> is provided with the pressure sensor <NUM>. It should be noted that the opening portion <NUM> of the inlet valve mounting hole <NUM>, the opening portion <NUM> of the outlet valve mounting hole <NUM>, and the opening portion <NUM> of the pressure sensor mounting hole <NUM> on the second surface <NUM> do not necessarily have to be arranged in a straight line and may be arranged in a zigzag pattern.

In addition, in the present embodiment, the pressure sensor mounting hole <NUM>, the outlet valve mounting hole <NUM>, and the inlet valve mounting hole <NUM> are arranged in order of shorter distance from the wheel cylinder port <NUM>. As described above, in the present embodiment, the pressure sensor <NUM> detects the pressure of the brake fluid applying pressure to the wheel cylinder <NUM>. In such a case, the inlet valve mounting hole <NUM>, the outlet valve mounting hole <NUM>, the pressure sensor mounting hole <NUM>, and the wheel cylinder port <NUM> are arranged along the direction of flow of the brake fluid flowing through the internal flow path <NUM> from the piston mounting hole <NUM> of the master cylinder <NUM> toward the wheel cylinder port <NUM>. Accordingly, as for the front wheel-side hydraulic pressure control device <NUM> configured as described above, that is, the rear wheel-side hydraulic pressure control device <NUM> configured as described above, the internal flow path <NUM> from the inlet valve mounting hole <NUM> to the wheel cylinder port <NUM> can be given a simple shape and the manufacturing cost can be suppressed.

In addition, in the present embodiment, at least a part of a holding portion <NUM> of the brake lever <NUM> that the rider grips with his or her hand is integrally formed on the base body <NUM>. Although the configuration of the holding portion <NUM> is not particularly limited, the holding portion <NUM> in the present embodiment includes a pair of holding plates <NUM>. Holes <NUM> rotatably supporting a shaft portion <NUM> (see <FIG>) of the brake lever <NUM> are formed in the holding plates <NUM>. With the shaft portion <NUM> of the brake lever <NUM> inserted in the hole <NUM>, the pair of holding plates <NUM> movably sandwich the brake lever <NUM>. As a result, the brake lever <NUM> is swingably held by the holding portion <NUM>. In addition, one of the pair of holding plates <NUM> is formed integrally with the base body <NUM> on, for example, a fifth surface <NUM>, which is the front surface of the base body <NUM>. It should be noted that the other of the pair of holding plates <NUM> is fixed to the base body <NUM> by, for example, screwing. By at least a part of the holding portion <NUM> being integrally formed on the base body <NUM>, the number of components and assembly man-hours of the brake system <NUM> and so on can be reduced and the manufacturing cost of the brake system <NUM> can be suppressed as compared with a case where the holding portion <NUM> is formed separately from the base body <NUM>.

In addition, in the present embodiment, at least a part of a mounting portion <NUM> for mounting the base body <NUM> on the handlebar <NUM> is integrally formed on the base body <NUM>. Although the configuration of the mounting portion <NUM> is not particularly limited, the mounting portion <NUM> in the present embodiment includes a base portion <NUM> integrally formed on the base body <NUM> and a sandwiching portion <NUM> fixed to the base portion <NUM> by screwing or the like. The base portion <NUM> is formed integrally with the base body <NUM> on, for example, a sixth surface <NUM>, which is the back surface of the base body <NUM>. The base body <NUM> is fixed to the handlebar <NUM> by the handlebar <NUM> being sandwiched between the base portion <NUM> and the sandwiching portion <NUM> and the sandwiching portion <NUM> being fixed to the base portion <NUM>. By at least a part of the mounting portion <NUM> being integrally formed on the base body <NUM>, the number of components and assembly man-hours of the bicycle <NUM> equipped with the brake system <NUM> and so on can be reduced and the manufacturing cost of the bicycle <NUM> can be suppressed as compared with a case where the mounting portion <NUM> is formed separately from the base body <NUM>.

In addition, in the present embodiment, the accumulator <NUM> is formed in the base body <NUM> of the front wheel-side hydraulic pressure control device <NUM>. At this time, the accumulator <NUM> is disposed on the side opposite to the opening portion <NUM> of the piston mounting hole <NUM> with reference to a bottom portion <NUM> of the piston mounting hole <NUM>. In other words, the piston mounting hole <NUM> of the master cylinder <NUM> and the accumulator <NUM> are arranged in the left-right direction in a plan view. The front wheel-side hydraulic pressure control device <NUM> in which the accumulator <NUM> is formed in this manner is capable of suppressing the width in the front-rear direction, in which the spatial margin is the least at the mounting position of the front wheel-side hydraulic pressure control device <NUM> of the bicycle <NUM>. Accordingly, with the front wheel-side hydraulic pressure control device <NUM> in which the accumulator <NUM> is formed in this manner, that is, the rear wheel-side hydraulic pressure control device <NUM> in which the accumulator <NUM> is formed in this manner, the degree of freedom of mounting on the bicycle <NUM> is improved when the accumulator <NUM> is formed in the base body <NUM>. It should be noted that the accumulator <NUM> in the present embodiment is obtained by the opening portion of a hole open in the sixth surface <NUM> being blocked. However, this configuration of the accumulator <NUM> is merely an example. For example, the accumulator <NUM> may be formed by the opening portion of a hole open in the fourth surface <NUM> being blocked. In another example, the accumulator <NUM> may be formed by the opening portion of a hole open in the fifth surface <NUM> being blocked.

The effects of the hydraulic pressure control device according to the embodiment will be described.

The hydraulic pressure control device (front wheel-side hydraulic pressure control device <NUM> and rear wheel-side hydraulic pressure control device <NUM>) according to the present embodiment is used in the brake system <NUM> capable of executing anti-lock brake control and is mounted to the handlebar <NUM> of the bicycle <NUM>. The hydraulic pressure control device according to the present embodiment includes the base body <NUM>, the control valve <NUM>, the pressure sensor <NUM>, and the control device <NUM>. The base body <NUM> is formed with the piston mounting hole <NUM> where the piston <NUM> of the master cylinder <NUM> is provided so as to be capable of reciprocating and the internal flow path <NUM> as a part of the brake fluid flow path that allows the piston mounting hole <NUM> and the wheel cylinder <NUM> to communicate with each other. The control valve <NUM> opens and closes the internal flow path <NUM> and adjusts the pressure of the brake fluid supplied to the wheel cylinder <NUM>. The pressure sensor <NUM> is provided in the base body <NUM> and detects the pressure of the brake fluid in the internal flow path <NUM>. The control device <NUM> controls the opening and closing operation of the control valve <NUM> based on the detection result of the pressure sensor <NUM>. The control device <NUM> is configured to output the control signal of the brake lamp <NUM> of the bicycle <NUM> based on the detection result of the pressure sensor <NUM>.

The control device <NUM> of the hydraulic pressure control device according to the present embodiment configured as described above outputs the control signal of the brake lamp <NUM> of the bicycle <NUM> based on the detection result of the pressure sensor <NUM> used in controlling the pressure of the brake fluid supplied to the wheel cylinder <NUM>. Accordingly, when the bicycle <NUM> is equipped with the hydraulic pressure control device according to the present embodiment configured as described above, a dedicated brake switch detecting whether or not the brake is applied is unnecessary. Accordingly, a signal line connected to the brake switch is also unnecessary when the bicycle <NUM> is equipped with the hydraulic pressure control device according to the present embodiment configured as described above. Accordingly, the hydraulic pressure control device according to the present embodiment configured as described above is capable of suppressing an increase in complexity around the handlebar <NUM> as compared with the related art when the bicycle <NUM> is equipped with the hydraulic pressure control device according to the present embodiment.

<FIG> is a diagram illustrating a schematic configuration of a modification example of the brake system according to the embodiment of the present invention.

As described above, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> have the configuration in which the accumulator <NUM> stores the brake fluid released from the wheel cylinder <NUM> during the pressure decrease in the anti-lock brake control and the brake fluid in the accumulator <NUM> is pumplessly discharged to the outside of the accumulator <NUM>. The internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> realizing such a configuration is not limited to the configuration described above. For example, the internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> may be configured as illustrated in <FIG>.

Specifically, the internal flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> illustrated in <FIG> includes a bypass flow path <NUM> and a check valve <NUM> in addition to the configuration of the internal flow path <NUM> illustrated in <FIG>. One end of the bypass flow path <NUM> is connected to the accumulator <NUM>, and the other end of the bypass flow path <NUM> is connected to the first flow path <NUM>. The check valve <NUM> is provided on the bypass flow path <NUM> and regulates the brake fluid flow from the master cylinder <NUM> side to the accumulator <NUM> side. Also in the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> in which the internal flow path <NUM> is configured as described above, the accumulator <NUM> is capable of storing the brake fluid released from the wheel cylinder <NUM> during the pressure decrease in the anti-lock brake control and the brake fluid in the accumulator <NUM> can be pumplessly discharged to the outside of the accumulator <NUM> via the bypass flow path <NUM>.

<FIG> is a block diagram illustrating the modification example of the brake system according to the embodiment of the present invention. In addition, <FIG> is a side view illustrating a schematic configuration of a bicycle equipped with the modification example of the brake system according to the embodiment of the present invention.

In the front wheel-side hydraulic pressure control device <NUM> of the brake system <NUM> illustrated in <FIG>, the component of the operation determination unit <NUM> is configured as an operation determination control board <NUM> different from the control board <NUM>. Accordingly, in the front wheel-side hydraulic pressure control device <NUM> of the brake system <NUM> illustrated in <FIG>, the component of the control unit <NUM> is configured as the control board <NUM>. Likewise, in the rear wheel-side hydraulic pressure control device <NUM> of the brake system <NUM> illustrated in <FIG>, the component of the operation determination unit <NUM> is configured as the operation determination control board <NUM> different from the control board <NUM>. Accordingly, in the rear wheel-side hydraulic pressure control device <NUM> of the brake system <NUM> illustrated in <FIG>, the component of the control unit <NUM> is configured as the control board <NUM>. The operation determination control board <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the operation determination control board <NUM> of the rear wheel-side hydraulic pressure control device <NUM> are configurations used together. In addition, the operation determination control board <NUM> is stored at a part different from the housing <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the housing <NUM> of the rear wheel-side hydraulic pressure control device <NUM>. It should be noted that the signal output unit <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> is also configured as the operation determination control board <NUM>.

In other words, the operation determination control board <NUM> determines the opening and closing operation of the control valve <NUM> of the front wheel-side hydraulic pressure control device <NUM> and determines the opening and closing operation of the control valve <NUM> of the rear wheel-side hydraulic pressure control device <NUM> based on information on the traveling state of the bicycle <NUM>. In addition, the control board <NUM> of the front wheel-side hydraulic pressure control device <NUM> controls the opening and closing operation of the control valve <NUM> of the front wheel-side hydraulic pressure control device <NUM> based on the determination by the operation determination control board <NUM>. In other words, the control board <NUM> of the front wheel-side hydraulic pressure control device <NUM> controls the energization of the first coil <NUM> and the second coil <NUM> of the front wheel-side hydraulic pressure control device <NUM> based on the determination by the operation determination control board <NUM>. In addition, the control board <NUM> of the rear wheel-side hydraulic pressure control device <NUM> controls the opening and closing operation of the control valve <NUM> of the rear wheel-side hydraulic pressure control device <NUM> based on the determination by the operation determination control board <NUM>. In other words, the control board <NUM> of the rear wheel-side hydraulic pressure control device <NUM> controls the energization of the first coil <NUM> and the second coil <NUM> of the rear wheel-side hydraulic pressure control device <NUM> based on the determination by the operation determination control board <NUM>.

In the brake system <NUM> configured as described above, the operation determination control board <NUM> can be stored in a housing different from the housing <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the housing <NUM> of the rear wheel-side hydraulic pressure control device <NUM>. In other words, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> can be further reduced in size with the brake system <NUM> configured as described above and the degree of freedom of mounting of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> on the bicycle <NUM> is further improved. In addition, with the brake system <NUM> configured as described above, the number of signal lines connected to the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> can be reduced and an increase in complexity around the handlebar <NUM> can be further suppressed.

Here, as illustrated in <FIG>, the operation determination control board <NUM> is preferably mounted to the bicycle <NUM> at a position behind the handlebar <NUM>. As a result, a stone or the like hitting the housing for storing the operation determination control board <NUM> during the traveling of the bicycle <NUM> can be suppressed and the reliability of the brake system <NUM> is improved.

In addition, in a case where the bicycle <NUM> is equipped with an other device control board <NUM> as a control board of a device other than the brake system <NUM> as illustrated in <FIG>, the operation determination control board <NUM> is preferably formed integrally with the other device control board <NUM>. Here, the bicycle <NUM> illustrated in <FIG> includes a control board monitoring the charge amount of the power source unit <NUM>. Accordingly, in the bicycle <NUM> illustrated in <FIG>, the control board monitoring the charge amount of the power source unit <NUM> is used as the other device control board <NUM>. It should be noted that the other device control board <NUM> is not particularly limited insofar as it is a control board of a device other than the brake system <NUM>. For example, some straddle-type vehicles provided with an engine as a drive source are provided with an engine control unit. For example, the control board of the engine control unit may be used as the other device control board <NUM>.

By the brake system <NUM> being configured as described above, the manufacturing cost of the brake system <NUM> can be reduced as compared with a case where the operation determination control board <NUM> is manufactured as a dedicated control board. In addition, in a case where a detection device (such as the pressure sensor <NUM>) detecting the information that the operation determination control board <NUM> uses in determining the opening and closing operation of the control valve <NUM> and the other device control board <NUM> are connected by a signal line, the number of signal lines routed to the bicycle <NUM> can be reduced and the manufacturing man-hours and manufacturing cost of the bicycle <NUM> can be reduced as compared with a case where the operation determination control board <NUM> is manufactured as a dedicated control board.

The front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> illustrated in <FIG> include a pump <NUM> sending a brake fluid to the region between the master cylinder <NUM> (that is, the piston mounting hole <NUM>) and the inlet valve <NUM> in the internal flow path <NUM>. Specifically, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> illustrated in <FIG> are provided with the pump <NUM> on the bypass flow path <NUM> of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> illustrated in <FIG>. As for the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> configured as described above, the brake fluid stored in the accumulator <NUM> during pressure decrease in anti-lock brake control can be discharged to the outside of the accumulator <NUM> via the bypass flow path <NUM> by the pump <NUM> being operated.

With the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> configured as described above, the effects described above can be obtained except for the reduction in the sizes of the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> resulting from pumplessly discharging the brake fluid in the accumulator <NUM> out of the accumulator <NUM>.

In addition, as for the front wheel-side hydraulic pressure control device <NUM> configured as illustrated in <FIG>, the pressure of the brake fluid of the wheel cylinder <NUM> of the front wheel-side braking portion <NUM> can be increased and a braking force can be generated on the front wheel <NUM> by the inlet valve <NUM> being opened, the outlet valve <NUM> being closed, and the pump <NUM> being operated with the brake lever <NUM> not gripped by the rider. Likewise, as for the rear wheel-side hydraulic pressure control device <NUM> configured as illustrated in <FIG>, the pressure of the brake fluid of the wheel cylinder <NUM> of the rear wheel-side braking portion <NUM> can be increased and a braking force can be generated on the rear wheel <NUM> by the inlet valve <NUM> being opened, the outlet valve <NUM> being closed, and the pump <NUM> being operated with the brake lever <NUM> not gripped by the rider.

By generating a braking force on at least one of the front wheel <NUM> and the rear wheel <NUM> as described above, the bicycle <NUM> can be provided with, for example, an automatic brake function. In addition, by generating a braking force on at least one of the front wheel <NUM> and the rear wheel <NUM> as described above, the behavior of the bicycle <NUM> can be stabilized. For example, slip suppression can be achieved when the bicycle <NUM> turns.

Here, in a case where a braking force is generated on the front wheel <NUM> as described above, the pressure detected by the pressure sensor <NUM> increases in the front wheel-side hydraulic pressure control device <NUM>. Likewise, in a case where a braking force is generated on the rear wheel <NUM> as described above, the pressure detected by the pressure sensor <NUM> increases in the rear wheel-side hydraulic pressure control device <NUM>. Accordingly, the front wheel-side hydraulic pressure control device <NUM> and the rear wheel-side hydraulic pressure control device <NUM> preferably output the control signal of the brake lamp <NUM> in the event of an increase in the pressure detected by the pressure sensor <NUM> during the operation of the pump <NUM>. In a case where a braking force is generated on the vehicle wheel of the bicycle <NUM> as described above, the brake lamp <NUM> is incapable of emitting light, because the brake lever <NUM> is not gripped by the rider, by the method of the related art by which the brake lamp is turned on based on the detection result of the brake switch. However, by outputting the control signal of the brake lamp <NUM> with the pressure detected by the pressure sensor <NUM> increased during the operation of the pump <NUM>, the brake lamp <NUM> is capable of emitting light when a braking force is generated on the vehicle wheel of the bicycle <NUM> with the brake lever <NUM> not gripped by the rider. As a result, a vehicle traveling behind the bicycle <NUM> is capable of knowing that the braking force of the bicycle <NUM> has changed. Accordingly, the safety of the bicycle <NUM> is improved by outputting the control signal of the brake lamp <NUM> with the pressure detected by the pressure sensor <NUM> increased during the operation of the pump <NUM>.

Claim 1:
A hydraulic pressure control device (<NUM>, <NUM>) used in a brake system (<NUM>) capable of executing anti-lock brake control and mounted to a handlebar (<NUM>) of a straddle-type vehicle (<NUM>), the hydraulic pressure control device (<NUM>, <NUM>) comprising:
a master cylinder-integrated base body (<NUM>) where a piston mounting hole (<NUM>) where a piston (<NUM>) of a master cylinder (<NUM>) is provided so as to be capable of reciprocating and an internal flow path (<NUM>) as a part of a brake fluid flow path allowing the piston mounting hole (<NUM>) and a wheel cylinder (<NUM>) to communicate with each other are formed;
a control valve (<NUM>) opening and closing the internal flow path (<NUM>) and adjusting pressure of a brake fluid supplied to the wheel cylinder (<NUM>) from the master cylinder (<NUM>);
a pressure sensor (<NUM>) provided in the base body (<NUM>) and detecting the pressure of the brake fluid between the control valve (<NUM>) and the wheel cylinder (<NUM>) in the internal flow path (<NUM>); and
a control device (<NUM>) controlling the opening and closing operation of the control valve (<NUM>) based on a detection result of the pressure sensor (<NUM>),
characterized in that
the control device (<NUM>) is configured to output a control signal of a brake lamp (<NUM>) of the straddle-type vehicle (<NUM>) based on the detection result of the pressure sensor (<NUM>).