Patent Description:
There are many application scenarios requiring switching mechanism in the power system of new energy vehicles, such as gear shifting, splitting, locking, parking, etc. An electromagnetic clutch is a preferred choice to realize the function of switching mechanism. With the continuous development of the new energy vehicle industry, the performance requirements of the electromagnetic clutch are becoming higher. However, conventional electromagnetic clutches have many disadvantages such as complex overall structure, incompactness, large occupied space, fewer applicable scenarios, limited layout space and installation position, which affect the spatial configuration of various components in the power system of the new energy vehicle to a certain extent.

<CIT> provides a locking structure of a differential mechanism. The locking structure comprises an electromagnetic clutch, wherein the electromagnetic clutch is arranged on an output half shaft on one side of the differential mechanism in a sleeving mode, the electromagnetic clutch comprises a movable locking disc and a fixed locking disc, the fixed locking disc is fixedly connected with a differential mechanism shell, and movable end face teeth and fixed end face teeth which can be engaged with each other are arranged on the movable locking disc and the fixed locking disc respectively. The movable locking disc only sleeves the output half shafts in an axial sliding mode, the electromagnetic clutch drives the movable locking disc to move axially after being powered on, and the movable end face teeth are engaged with the fixed end face teeth, so that the output half shafts and the differential mechanism shell are locked, and the two output half shafts of the differential mechanism and the differential mechanism shell are at the same rotating speed.

<CIT> provides a monostable electromagnetic clutch, which comprises a movable assembly and a magnetic assembly, an elastic component is arranged on the movable assembly, the movable assembly can penetrate through the magnetic assembly, the magnetic assembly can generate electromagnetic force under the condition of being electrified, and under the action of the electromagnetic force and the elastic force of the elastic component, the monostable electromagnetic clutch is driven to rotate. And the movable component can do reciprocating motion in the magnetic component.

<CIT> provides a differential system. The differential system includes a differential and a differential splitting mechanism. The differential includes a differential outer shell and a differential inner shell. The differential outer shell is used to communicate with the differential. The upper-level transmission structure of the gear is transmission connected; the differential cutting mechanism includes a cutting clutch, a first end face tooth and a second end face tooth. The first end face tooth is arranged between the differential case and the differential inner case. And it is movably connected with the differential housing, so that the first end face tooth moves axially relative to the differential case and rotates synchronously, and the second end face tooth is fixedly connected with the differential inner case; the cutting clutch is connected with the first end face tooth by The first end face tooth is driven to move axially relative to the second end face tooth, and the first end face tooth and the second end face tooth are controlled to engage or separate.

<CIT> provides coupling for rotationally connecting actuating shafts (<NUM>; <NUM>) of weave machines (<NUM>) and weaving looms (<NUM>), comprising at least one first clutch element (<NUM>) integral with the said shaft (<NUM>) of the weave machine (<NUM>) and a second clutch element (<NUM>) integral with the shaft (<NUM>) of the weaving loom (<NUM>), said second clutch element (<NUM>) comprising a disk (<NUM>) movable coaxially, owing to the thrusting action of associated means (<NUM>), for engagement with said first clutch element (<NUM>), there also being provided fixed means (<NUM>;15a) for recalling said disk (<NUM>) in the axial direction in order to cause disengagement thereof from the first clutch element (<NUM>) integral with the shaft of the weave machine (<NUM>), said disk (<NUM>) having first means (11b) and second means (lid) for engagement with corresponding means (21b) of the first clutch element (<NUM>) and with means (15d) of said second clutch element (<NUM>), respectively.

In view of the above background, the present disclosure provides a monostable electromagnetic clutch to overcome the above problems or at least partially solve the above problems.

In order to achieve the above object, the present disclosure adopts the following technical solutions.

A monostable electromagnetic clutch, comprising a movable member, a magnetic assembly, a fixed disc, and a plurality of iron cores, wherein the magnetic assembly is connected to the fixed disc, the iron cores cross through the magnetic assembly and are connected to the fixed disc, the movable member is provided thereon with an spring member, and under an action of an electromagnetic force of the magnetic assembly and an spring force of the spring member, the movable member can reciprocate at a side of the magnetic assembly to keep the movable member and the iron cores in an engaged state or a disengaged state.

Preferably, a side of the movable member close to the magnetic assembly is provided with a plurality of counterbores, a shape of the counterbore matches a shape of an end face of the iron core, so that the end face of the iron core can be embedded in the counterbore, and the spring member is disposed on the other side of the movable member.

Preferably, the movable member is a movable disc, and the counterbores are disposed on a side of the movable disc close to the magnetic assembly.

Preferably, the spring member is a position-returning spring assembly, and the position-returning spring assembly may be a linear spring, a nonlinear spring, or a spring assembly composed of linear and nonlinear springs.

Preferably, the magnetic assembly comprises an electromagnetic coil wrapped around a periphery of the iron core and a coil bobbin, and the coil bobbin is used to fix the electromagnetic coil.

Preferably, a periphery of the iron core is further provided with a flange, and the electromagnetic coil and the coil bobbin are provided between the flange and the fixed disc.

Preferably, the iron core has a cylindrical shape, and the magnetic assembly is provided around the periphery of the iron core.

Preferably, the flange is provided around the periphery of the iron core, and the magnetic assembly is provided between the flange and the fixed disc.

Preferably, the iron core is connected to the fixed disc via a fixing pin.

Preferably, the monostable electromagnetic clutch comprises two magnetic assemblies, two iron cores, two fixing pins, one fixed disc and a plurality of spring members.

The advantages and beneficial effects of the present disclosure are as follows.

The present disclosure adopts a modular design, and the movable member, fixed disc, magnetic assembly, spring member, iron cores, etc. are integrated into an electromagnetic clutch basic unit. The structural design of the present disclosure is flexible and compact, and can be combined in a different way according to different applications and different structural spaces. The electromagnetic clutch basic units can be used separately, or a plurality of electromagnetic clutch basic units can be combined freely, and after combination, they can be freely arranged in a variety of installation positions and spaces as required. Regarding the distribution space, they can be distributed evenly, symmetrically or asymmetrically according to actual needs, and the use of space can be fully optimized.

By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to a person of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiments, and should not be considered as a limitation to the present disclosure. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:.

In the drawings: <NUM>. fixed disc; <NUM>. iron core; <NUM>. fixing pin; <NUM>. coil bobbin; <NUM>. electromagnetic coil; <NUM>. movable member; <NUM>. spring member; <NUM>. bearing; <NUM>. thrust disc; <NUM>. anti-rotation pin; <NUM>. anti-rotation pin; <NUM>. end-toothed disc; <NUM>. outer differential case; <NUM>. inner differential case; <NUM>. pressing ring; <NUM>. half axle gear; <NUM>. planetary gear shaft; <NUM>. planetary gear; <NUM>. half axle gear; <NUM>. flange; <NUM>. counterbore; <NUM>. magnetic assembly.

In order to make the objectives, technical solutions, and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be described clearly and completely in conjunction with specific embodiments of the present disclosure and corresponding drawings. Obviously, the embodiments described herein are only part of the embodiments of the present disclosure, rather than all of the embodiments. Based on these embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without paying creative work shall fall within the protection scope of the present disclosure.

The technical solutions of embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. As shown in <FIG>, the monostable electromagnetic clutch according to the present disclosure comprises: a movable member <NUM>, a magnetic assembly <NUM>, a fixed disc <NUM>, and a plurality of iron cores <NUM>. The magnetic assembly <NUM> is connected to the fixed disc <NUM>, and the iron cores <NUM> cross through the magnetic assembly <NUM> and are connected to the fixed disc <NUM>. The movable member <NUM> is provided thereon with an spring member <NUM>. The magnetic assembly <NUM> can generate an electromagnetic force when it is energized. Under the action of the electromagnetic force of the magnetic assembly <NUM> and the spring force of the spring member <NUM>, the movable member <NUM> can reciprocate at a side of the magnetic assembly <NUM> to keep the movable member <NUM> and the iron cores <NUM> in an engagement state or a disengagement state. When the magnetic assembly is energized, the movable member <NUM> is attracted to a position close to the iron cores <NUM> under the action of electromagnetic force (see <FIG>) to realize the engagement of the electromagnetic clutch. When the magnetic assembly is not energized, the movable member <NUM> returns to its original position under the spring force of the spring member <NUM>, as shown in <FIG>. At this moment, the movable member <NUM> does not connect to the iron cores <NUM>, and the electromagnetic clutch is disengaged.

In an embodiment of the present disclosure, as shown in <FIG>, a plurality of counterbores <NUM> is provided at a side of the movable member <NUM> close to the magnetic assembly <NUM>. The shape of the counterbores <NUM> matches the shape of an end face of the iron core <NUM>, so that the end face of the iron core <NUM> can be embedded in the counterbores <NUM>. When the end face of the iron cores is embedded in the counterbores, the electromagnetic clutch is in an engaged state, and when they are not embedded, the electromagnetic clutch is in a disengaged state. The working flow of this embodiment is as follows. When the magnetic assembly <NUM> is not energized, referring to <FIG>, the movable member <NUM> is not embedded in the iron core, and the electromagnetic clutch is in a disengaged or disconnected state. When the magnetic assembly <NUM> is energized, referring to <FIG>, the electromagnetic force generated at this moment attract the movable member <NUM> to a position close to the iron cores <NUM>. At this moment, the spring member <NUM> at the other side of the movable member <NUM> is stretched, and the electromagnetic force is greater than the spring force to keep the electromagnetic clutch in an engaged state. Upon the magnetic assembly is de-energized, the electromagnetic force disappears, and the movable member <NUM> will return to the state of the electromagnetic clutch shown in <FIG> again, and the cycle repeats itself in this way. Preferably, in order to further improve the stability of connection, in an embodiment of the present disclosure, the iron core <NUM> is connected to the fixed disc <NUM> via a fixing pin <NUM>.

In an embodiment of the present disclosure, the movable member <NUM> is designed to have a disc-shaped structure to save space. Namely, it is designed as a movable disc. The counterbores <NUM> are provided on a side of the movable disc close to the magnetic assembly <NUM> and correspond to the position of the end face of the iron cores <NUM>, and the spring member <NUM> is provided at the other side of the movable disc.

In an embodiment of the present disclosure, the spring member <NUM> is preferably a position-returning spring assembly, which may be a linear spring, a non-linear spring, or a spring assembly composed of linear and non-linear springs.

In an embodiment of the present disclosure, the magnetic assembly <NUM> comprises an electromagnetic coil <NUM> wrapped around a periphery of the iron core and a coil bobbin <NUM>, and the coil bobbin <NUM> is used to fix the electromagnetic coil <NUM>.

In an embodiment of the present disclosure, the periphery of the iron core <NUM> is further provided with a flange <NUM>. The electromagnetic coil <NUM> and the coil bobbin <NUM> are provided between the flange <NUM> and the fixed disc <NUM>, and the magnetic assembly <NUM> is clamped by the flange <NUM> to prevent it from falling off. More preferably, the iron core <NUM> is designed to have a cylindrical shape, the magnetic assembly <NUM> is provided around the periphery of the iron core <NUM>, and the flange <NUM> is provided around the periphery of the iron core <NUM>. The surrounding flange <NUM> can better clamp the magnetic assembly <NUM> between the flange <NUM> and the fixed disc <NUM>.

In a preferred embodiment of the present disclosure, a monostable electromagnetic clutch basic unit comprises two magnetic assemblies <NUM>, two iron cores <NUM>, two fixing pins <NUM>, one fixed disc <NUM> and a plurality of spring members <NUM>. In this embodiment, the electromagnetic clutch basic unit has fewer parts, is simple in structure and does not occupy much space. The electromagnetic clutch basic units can be applied separately, or a plurality of electromagnetic clutch basic units can be combined freely. Their application scenarios include but are not limited to the following scenarios.

Referring to <FIG>, in this embodiment, two electromagnetic clutch basic units are symmetrically arranged to form a symmetrical electromagnetic clutch structure. The fixed disc <NUM> and the movable member <NUM> are integrated into one integral part. This embodiment can be applied to the situation where the circumferential space is limited to a certain extent and the axial space is smaller.

Referring to <FIG> and <FIG>, in this embodiment, the example <NUM> is specifically applied to the disconnect function. In this embodiment, the electromagnetic clutch in example <NUM> is sleeved at a side of a differential. The movable member <NUM> is connected to an thrust disc <NUM> via a bearing <NUM>, so that the movable assembly of the electromagnetic clutch body can only move linearly in the axial direction. At the same time, in order to limit the rotation and movement in other degrees of freedom of the movable assembly of the electromagnetic clutch body, in this embodiment, the movable member <NUM> is also provided thereon with an anti-rotation pin <NUM> and an anti-rotation pin <NUM>, which are fixed and restrict the movable assembly to move only axially. The thrust disc <NUM> and an end-toothed disc <NUM> are connected by bolts, pins or flange on the thrust disc <NUM>/ the end-toothed disc <NUM>. The connecting part crosses through the differential case. The outer edge of the end-toothed disc is provided with an external spline, the differential case is provided with corresponding an internal spline slot, and during the rotation of the differential, the end face gear is driven to transmit rotation speed and torque via the spline connection.

As shown in <FIG>, an inner differential case <NUM> is provided thereon with end face teeth which can mesh with end face teeth on the end-toothed disc <NUM>. A spring assembly is provided between the end-toothed disc <NUM> and a pressing ring <NUM>. When the electromagnetic clutch is in a disengaged state, the spring assembly between the end-toothed disc <NUM> and the pressing ring <NUM> enables the end face teeth on the end-toothed disc <NUM> and the end face teeth on the inner differential case <NUM> in a disengaged state. At this moment, the inner differential case operates independently, and the outer differential case cannot transmit energy to a half axle gear <NUM> and a half axle gear <NUM>.

When an excitation current is supplied to the electromagnetic coil <NUM>, the electromagnetic clutch is engaged, and the movable member <NUM> moves toward the electromagnetic coil <NUM>. The movable member <NUM> pushes the thrust disc <NUM> via the bearing <NUM>, and the thrust disc <NUM> pushes the end-toothed disc <NUM> to move toward the inner differential case <NUM> via the connecting part until the end-toothed disc <NUM> connects to the end face teeth of the inner differential case <NUM>. The movable assembly stops upon moving to a position-limiting device on an outer differential case <NUM> and the thrust disc <NUM>. At this moment, the differential lock is in an engaged state. In the engaged state, there is no relative movement between the inner differential case <NUM> and the outer differential case <NUM>. At this moment, the torque and rotation speed transmitted to the outer differential case are transmitted to the inner differential case <NUM> via the end-toothed disc <NUM>, and the torque and rotation speed are further transmitted to the half axle gear <NUM> and the half axle gear <NUM> via a planetary gear <NUM> and a planetary gear shaft <NUM>.

Claim 1:
A monostable electromagnetic clutch, comprising a movable member (<NUM>), a magnetic assembly (<NUM>), a fixed disc (<NUM>), and a plurality of iron cores (<NUM>), characterized in that:
the magnetic assembly (<NUM>) is connected to the fixed disc (<NUM>), the iron cores (<NUM>) cross through the magnetic assembly (<NUM>) and are connected to the fixed disc (<NUM>), the movable member (<NUM>) is provided thereon with an spring member (<NUM>), and under an action of an electromagnetic force of the magnetic assembly (<NUM>) and an spring force of the spring member (<NUM>), the movable member (<NUM>) can reciprocate at a side of the magnetic assembly (<NUM>) to keep the movable member (<NUM>) and the iron cores (<NUM>) in an engaged state or a disengaged state.