Patent Description:
For motor vehicles (especially commercial vehicles), an original tire inflating valve is often loaded with a tire pressure gauge (<FIG>) for measuring a tire pressure, a sensor for monitoring a tire pressure (<FIG>), and a cap type external sensor (<FIG>), an automatic tire reinflating device (<FIG>) and an inflation extension tube (<FIG>), etc. Presently, these loading devices (as shown in <FIG>) are carried by a welded external inflating valve, or (as shown in <FIG>) are directly mounted on the mouth of the tire inflating valve. The external inflating valve is directly connected to the original tire inflating valve. In the attached drawings <NUM> to <NUM> for description of prior art, A1 represents the loaded functional device, such as barometers, sensors, etc.; A2 represents the valve core in the external inflating valve; A3 is the welding part, and A4 is a built-in rubber flat gasket of an external loading part, and A5 is a push rod of an external loading part.

In the above structure, the connection between the external inflating valve and the original tire inflating valve is to push the valve core of the original tire inflating valve by a push rod A5 of the external connection part (<FIG>) , so that the tire air source can introduce into the loading part, which will produce an obvious failure (<FIG>): Firstly, the main sealing function of the cone B1 of the original tire inflating valve core cavity is abandoned, and the sealing is achieved only relying on the inflating valve mouth and the built-in rubber flat gasket A4 of the external loading part. According to the sealing principle of the inflating valve, the PTFE pressure-resistant sealing ring of the valve core is combined with the conical surface provided in the inflating valve core cavity to achieve effective sealing and prevent the leakage of tire pressure. The above-mentioned sealing through the inflating valve mouth easily causes chronic tire pressure leakage due to the processing shape and roughness of the mouth and the permanent compression and deformation of the rubber flat washer; secondly, the inner spring of the valve core is in a state of extreme compression for a long time, and the yielding deformation dysfunctions the check valve of the valve core.

In summary, the valve cores are in a normally open state after the above loading parts are connected to the inflating valve (the sealing functions of the sealing cone defined by the inflating valve is abandoned), which causes the defects of failure of sealing functions and inconvenient operation of inflating valve, etc..

In addition, for the external inflating valve, one part is for one purpose, and the loading function is single, the inflating and deflating are inconvenient, and the applicability is poor. Welding is often used for connection, and the processing technology is complicated, and the reliability is poor.

Further attention is drawn to <CIT>, disclosing a pressure contact switch for monitoring the inflation pressure of tires comprises a piston subjected on one side to the pressure of the air in the tire and on the other side to the force of an opposing calibrated spring. A rod coaxial with the piston is formed with an inclined cam surface to push back a contact slide capable of sliding in a first bore. The rod is also formed with a guide and stop for a locking slide capable of sliding in a second bore having an axis perpendicular to that of the first bore. The two slides are urged at all times by springs in directions towards the intersection of the two bores.

The present invention aims to solve the technical problem of providing a multifunctional external inflating valve which is capable of avoiding problems of external inflating valves in the part, and effectively preventing tire pressure leakage. To this end, the present invention adopts the technical solution as defined by claim <NUM>.

On the basis of the technical solution, the present invention can also adopt the following further technical solutions, or combines and uses the further technical solutions:
The side surface connecting part is a connecting hole or threaded connecting column. A sealing ring accommodation groove is formed in the opening of the connecting hole. A through hole is formed in the threaded connecting column to pass through the axial middle hole from the side surface.

The hole cavity of the main body comprises an inner cylinder portion. The valve core is mounted in a core holder. The core holder is mounted in the position of the inner cylinder of the hole cavity of the main body in an interference fit manner. The valve core is mounted in the core holder.

The external inflating valve is provided with a core sealing ring, and the core sealing ring is mounted in a core sealing ring clamping groove to achieve sealing of the tail part of the valve core.

A main cylinder and a clamping part are arranged at the rear part of the valve core and used for cooperating with the core holder to fix the valve core on the main body. A transition section is arranged at the front part of the main cylinder, and the transition section forms a mounting channel of the sealing ring after the valve core is assembled. The core holder is provided with an inner cylindrical surface, and the inner cylindrical surface and the main cylinder of the valve core are in clearance fit with mutual rotation. The outer conical surface of the valve core is arranged at the front end of the transition section.

A minimum cylinder end is arranged at the front end of the outer conical surface of the valve core. An outer cone formed by the outer conical surface of the valve core comprises a small-diameter end and a large-diameter end, and an annular groove is formed in the large-diameter end of the outer cone.

An "O"-shaped sealing ring is mounted in the position of a step at the front end of the inner cylinder in the hole cavity of the main body, to achieve secondary sealing of the mouth of the original tire inflating valve with the external inflating valve. The front end of the core holder after mounted is generally flush with the step.

Another technical problem to be solved by the present invention is to provide a mounting method of a loading device of an inflating valve. To this end, the present invention adopts the following technical solutions:
the mounting method of the loading device of the inflating valve, comprising steps of disassembling the valve core of the original tire inflating valve, and connecting outer threads of the original tire inflating valve with inner threads of the hole cavity of any one of the multifunctional external inflating valves. Due to the length of the transition section of the valve core, the front end of the valve core and a portion where the core conical surface sealing rubber pipe is arranged can be inserted into a part where a valve core is originally arranged, of the original tire inflating valve. The core conical surface sealing rubber pipe is capable of reclining on a conical hole sealing surface of an inflating valve hole cavity. Therefore, an original sealing effect of the external inflating valve with the original tire inflating valve is achieved.

The loading device comprises a tire gauge, a sensor for monitoring tire pressure, a cap type external sensor, an automatic tire reinflating device and an inflation extension tube.

A vehicle tire (and rim) inflating valve is an accessory mounted according to standards, and has functions of filling, discharging and sealing air (or liquid) for a tire. The original tire inflating valve is loaded with the external inflating valve for carrying a pressure gauge, a tire pressure and temperature monitoring sensor, an automatic tire reinflating device, an inflation extension tube, etc., aiming at adding functions such as convenience in inflation and deflation, maintenance of tire pressure, and tire pressure and temperature monitoring. By adopting the external inflating valve of the present invention, sealing and self-sealing of a sealing conical surface of an original inflating valve hole cavity can be achieved by means of an end part core assembly, and tire pressure leakage can be effectively prevented.

Meanwhile, the multifunctional external three-way inflating valve of the present invention is capable of loading functional parts such as different connectors, pressure gauges, sensors and automatic reinflating devices, so function diversity is sufficiently achieved. Due to interfaces in two directions, a gas (or liquid) can be charged or flows out in two directions conveniently. Meanwhile, the distance between a loading structure and the axis of the inflating valve is closer, and the dynamic balance performance is improved.

Referring to <FIG> and <FIG>, and also referring to <FIG> and <FIG>, an external inflating valve provided in this example, comprising a three-way through main body <NUM>, a connecting hole <NUM> with metric threads (or NPT sealing tube threads) and a sealing ring accommodation groove <NUM> (used for connecting loading bodies) are arranged on a side surface of the main body <NUM>, the sealing ring accommodation groove <NUM> is located in the opening of the connecting hole <NUM>, and the groove is <NUM>-<NUM> in depth.

The connecting hole <NUM> is arranged in the middle of the main body <NUM>, and the wall thickness of a position, corresponding to the connecting hole <NUM>, of the main body <NUM> is larger than the wall thickness of the main body with a hole cavity <NUM> and also larger than the wall thickness of the main body with a valve core <NUM>. The inner diameter of the position, corresponding to the connecting hole <NUM>, of the main body <NUM> is smaller than the inner diameter of the hole cavity <NUM>. When mounted, loading parts such as a TPMS sensor assembly <NUM> are mounted on the side surface connecting hole <NUM> of the main body <NUM> in a threaded connection manner, being sealed with an "O"-shaped sealing ring <NUM> and fastened with an thread sealant <NUM> (other loading parts are similarly connected). Therefore, a series of processing and inspection process that a sensor is mounted and fixed through spinning processing after a sensor base is welded with an external inflating valve is avoided. In addition, the loading parts are closer to the axis of the inflating valve, and the dynamic balance performance is improved.

A hole cavity <NUM> is formed in the front end of the main body <NUM>, the hole cavity <NUM> is internally provided with 8V1 inner threads <NUM> used for being connected with an original tire inflating valve <NUM>, and specifically, the inner threads <NUM> are in threaded connection with outer threads <NUM> of the original tire inflating valve <NUM>.

A valve core <NUM> is arranged at the front end of the external inflating valve. The valve core <NUM> is mounted in a core holder <NUM>. A core sealing ring <NUM> is mounted in a core sealing ring clamping groove <NUM> to achieve sealing of the tail part of the valve core <NUM>. Specifically, the core sealing ring clamping groove <NUM> is arranged on a side surface of the valve core <NUM>, and the core sealing ring <NUM> is located between the valve core <NUM> and the core holder <NUM>.

The valve core <NUM> is provided with a main cylinder <NUM> with a diameter of <NUM>-<NUM>. A clamping part <NUM> is arranged at the rear part of the main cylinder <NUM> and is used for cooperating with the core holder <NUM> to fix the valve core <NUM> on the main body <NUM>. A transition section <NUM> with a diameter of <NUM> is arranged at the front part of the main cylinder <NUM>, and the transition section <NUM> forms a mounting channel <NUM> of a sealing ring <NUM> after the valve core <NUM> is assembled. The core holder <NUM> is provided with an inner cylindrical surface <NUM> of <NUM>±<NUM>, and the inner cylindrical surface <NUM> is in clearance fit with the main cylinder <NUM> of the valve core <NUM> in mutual rotation. An outer conical surface of the valve core is arranged at the front end of the transition section <NUM>.

The core holder <NUM> is mounted in the position of an inner cylinder <NUM> of a hole cavity <NUM> of the main body in an interference fit manner. The inner cylinder <NUM> is of <NUM>-<NUM> in diameter. The front portion, comprising the outer conical surface, of the valve core <NUM> protrudes out of the front end of the hole cavity <NUM> of the main body. A core conical surface sealing rubber pipe <NUM> is mounted on the outer conical surface of the valve core and used for sealing the valve core <NUM> and a conical hole sealing surface <NUM> of a tire inflating valve inner hole cavity. Therefore, an original sealing effect of the external inflating valve with the original tire inflating valve is achieved under the action of mounting torque.

A minimum cylinder end with a diameter of <NUM>-<NUM> is arranged at the front end of the outer conical surface of the valve core <NUM>. The diameter of a small-diameter end <NUM> of an outer cone formed by the outer conical surface of the valve core <NUM> is <NUM>-<NUM>, the diameter of a large-diameter end <NUM> is <NUM>-<NUM>, an angle is <NUM> degrees, a groove <NUM> with a diameter of <NUM>*<NUM> is formed in the large-diameter end of the outer cone, and the length of the groove and the outer cone in the axial direction of the external inflating valve is <NUM>. A central hole <NUM> with a diameter of <NUM>-<NUM> is formed in the valve core <NUM> in a through manner.

An "O"-shaped sealing ring <NUM> is mounted in the position of a step <NUM> at the front end of the inner cylinder <NUM> in the hole cavity <NUM> of the main body, to achieve secondary sealing of the mouth of the original tire inflating valve with the external inflating valve. The front end of the core holder <NUM> after mounted is generally flush with the step <NUM>.

The tail end of the main body <NUM> is processed and formed according to sizes of the hole cavity and threads of a standard inflating valve, and a common valve core <NUM> and a protective cap <NUM> are mounted thereon.

The core conical surface sealing rubber pipe <NUM> is made of a polytetrafluoroethylene material, and the "O"-shaped sealing ring is made of a silicone rubber or hydrogenated nitrile rubber. Sizes of the core conical surface sealing rubber pipe <NUM> are that the outer diameter is <NUM>±<NUM>, the wall thickness is <NUM>, the length is <NUM>±<NUM>, and the distance between the core conical surface sealing rubber pipe <NUM> mounted on the valve core and the core holder <NUM> is <NUM>-<NUM>.

During mounting, the valve core of the original tire inflating valve is disassembled, then the external inflating valve of the present invention is mounted on the original tire inflating valve <NUM>. Due to the length of the transition section <NUM> of the valve core <NUM>, the front end of the valve core <NUM> and a portion where the core conical surface sealing rubber pipe <NUM> is arranged can be inserted into a part where a valve core is originally arranged. The core conical surface sealing rubber pipe <NUM> is capable of reclining on a conical hole sealing surface <NUM> of an inflating valve hole cavity. With a mounting torque <<NUM> N. m, the valve core <NUM>, the core conical surface sealing rubber pipe <NUM> and the conical hole sealing surface <NUM> of the inflating valve hole cavity are in a mutual rotation and gradual compression process. When the torque is gradually increased, the valve core is rotated and presses vertically in the core holder, and is mounted in place when the mounting torque is <NUM>-<NUM> N. m, and the conical hole sealing surface <NUM> of the tire inflating valve hole cavity and the core conical surface sealing rubber pipe <NUM> are sealed to achieve the original sealing effect of the external inflating valve with the original tire inflating valve. In addition, due to distance fit of the step <NUM> and the outer conical surface of the valve core <NUM>, the "O"-shaped sealing <NUM> is also compressed by the end part of the original tire inflating valve and the step <NUM> to achieve secondary sealing at the moment. Therefore, not only is a good sealing effect achieved, that is, original sealing functions and effects can be achieved by the inflating valve, but also the total mass is relatively low.

Referring to <FIG>, <FIG> and <FIG>, and also referring to <FIG>, in this example, compared with Example <NUM>, sealing of the tail part of the valve core <NUM> is modified, others are identical to those of Example <NUM>, and mark numbers of Example <NUM>, identical to those of Example <NUM>, represent same meanings.

For sealing of the tail part of the valve core <NUM>, the core sealing ring <NUM> is mounted in the core sealing ring clamping groove <NUM> to achieve sealing of the tail part of the valve core <NUM>. Specifically, the core sealing ring clamping groove <NUM> is arranged on the tail end surface of the valve core, and the core sealing ring <NUM> is located between the tail end of the valve core <NUM> and a step <NUM> in the external inflating valve main body.

Referring to <FIG>, and also referring to <FIG> and <FIG>, in this example, a connecting threaded column <NUM> with metric threads (or NPT sealing tube threads) is arranged on a side surface of the external inflating valve main body <NUM>, and is used for connecting loading bodies, and in addition, a through hole <NUM> of <NUM>-<NUM> is formed in the threaded column.

Other parts of this example are the same as those of Example <NUM>.

Other parts of this example are the same as those of Example <NUM>. The following are results verified by type tests, taking Example <NUM> as an example:.

A product qualified in a room temperature test together with fixtures and ethanol for test are put into a cryogenic box at (minus <NUM> to <NUM>), compressed air of constant pressure of <NUM> Mpa at a low temperature is introduced in the test for <NUM> hours, and observation of <NUM> seconds shows that no bubble is caused. A product qualified in a low temperature test together with fixtures are put into a high-temperature cabinet at <NUM>+<NUM> for <NUM> hours, taken out and soaked into water of (<NUM>±<NUM>), compressed air of constant pressure of <NUM> Mpa is introduced, and observation of <NUM> seconds shows that no bubble is caused.

Claim 1:
A multifunctional external inflating valve having a front portion adapted to be connected to an original tire inflating valve (<NUM>) and having an opposing tail end, wherein the multifunctional external inflating valve comprises an inflating valve body provided with a three-way through main body (<NUM>); the main body being provided with an axial middle hole and a middle side surface connecting part (<NUM>), the middle side surface connecting part penetrating a side surface of the main body (<NUM>) to connect the axial middle hole; and the side surface connecting part (<NUM>) being used for connecting a loading device (<NUM>);
a valve core (<NUM>) is arranged in the axial middle hole, and the valve core is provided with a valve core body; and
a hole cavity (<NUM>) is formed in the front portion of the axial middle hole of the main body (<NUM>), and the hole cavity (<NUM>) is provided with internal threads (<NUM>) adapted to be connected to the original tire inflating valve (<NUM>), characterized in that:
an outer conical surface is arranged on the front portion of the valve core (<NUM>), the front portion of the valve core and the outer conical surface protrudes out of a front end of the hole cavity (<NUM>) of the main body (<NUM>), a core conical surface sealing rubber pipe (<NUM>) is mounted on the outer conical surface of the valve core (<NUM>) and used for sealing the valve core (<NUM>) and a conical hole sealing surface (<NUM>) of the original tire inflating valve (<NUM>) inner hole cavity, an axial through hole is formed in the valve core (<NUM>); and
a tail end of the main body (<NUM>) is processed and formed according to sizes of a hole cavity and internal threads of a standard inflating valve, and a common valve core (<NUM>) is mounted thereon.