KR20060124015A - Tire pressure control system - Google Patents

Abstract

An air pressure control apparatus of a tire is provided to prevent the performance of the brake from dropping due to the low air pressure of the tire and prevent the flat tire from connecting the accident by injecting the air in the tire through the air inlet and outlet unit while traveling. An air pressure control apparatus of a tire comprises a pneumatic system unit(10) equipped at the vehicle to generate the air necessary to keep the pneumatic condition of tires(T) at the proper condition and to flow and discharge the air; a pneumatic condition sensing unit(20) installed at a tire wheel to check the pneumatic condition of the tire where the air is inflowed or discharged by the pneumatic system unit; a system control unit(30) receiving the pneumatic condition of the tire from the pneumatic condition sensing unit, displaying the condition through the monitor, and supplying the power to the pneumatic system unit; and an air inlet/outlet unit(40) detachably mounted at the tire wheel to receive the air from the pneumatic system unit and to flow the air in the tire and discharge the air from the tire.

Description

Tire pressure control system {Tire pressure control system}

1 is an overall configuration diagram of a tire inflation pressure control apparatus according to the present invention.

2 is a block diagram of a tire inflation pressure control apparatus according to the present invention;

3 is a pneumatic circuit diagram of a tire inflation pressure control apparatus according to the present invention.

Figure 4 is a schematic plan view showing a pneumatic system in the tire pressure control device according to the present invention.

Figure 5 is a schematic cross-sectional view showing a state in which the air inlet and outlet means mounted on the tire wheel in the tire pressure control device according to the present invention.

Figure 6 is an exploded perspective view showing an exploded air inlet and outlet means in the tire pressure control device according to the present invention.

Explanation of symbols on the main parts of the drawings

10: pneumatic system part 11: regulator

12 compressor 13 pressure switch

14 filter 15 tank

16: valve unit 16a: inlet valve

16b: outlet valve 18: pressure sensor

20: air pressure state detection means 30: system control means

31: signal processor 32: electronic control device

33: ultra-compact processing unit 34: signal input and output board

35: notebook computer 36: power supply

40: air inlet and outlet means 41: disc

42: flange 43: coupling (sleeve)

44: body 45: ball bearing

46: rotating body (spool) 47: sealing member

48: closing cap T: tire

W: Tire Wheel WN: Wheel Nozzle

BT: Tightening Bolt NT: Wheel Nut

The present invention relates to a tire inflation pressure control device, and in particular, more precise and reliable tire inflation pressure monitoring by inspecting the performance of the tire inflation pressure monitoring system that detects the warning of the driver by detecting the presence of an abnormal air pressure condition of each tire while the vehicle is stopped or driving. The present invention relates to a tire inflation pressure control device that enables to develop a system and to control the inflation pressure of each tire while the vehicle is stopped or driving.

Recently, the ubiquitous revolution has been blowing in automobile tires. Smart tires, also known as smart tires, which actively detect dangers and guarantee driver safety, have entered the commercialization stage.

The smart tires currently required by the automotive industry are divided into two categories. First, check the air pressure by yourself to let the driver know that the air is missing, and no matter how hard tires are used after shipment, you should be able to easily check the manufacturing information.

On the other hand, when driving a car, it can be found that the tire air pressure is lowered, which is caused by the natural friction of rubber, nailing, trauma, and valve failure due to the resistance caused by natural friction as the car is driven, rather than the tire itself. This is most often due to air being exhausted for some reason.

Such a lack of tire pressure leads to abnormal wear of the tire, deterioration of the brake performance, economic loss such as puncture of the tire, etc., in particular, a threat to the safety of drivers and passengers during high-speed driving.

Therefore, drivers have to pay much attention to maintain the tire air pressure at an appropriate level, and there is a cumbersome problem of periodically performing the air pressure test.

The tire pressure monitoring system (TPMS) is a tire pressure monitoring system (TPMS) that informs the driver in real time of the temperature and air pressure in the tire through a sensor mounted in the tire in order to alleviate such inconvenience from the driver.

However, while the research and development of the tire pressure monitoring system is being actively conducted, there is no test device capable of verifying the durability and reliability of the tire pressure monitoring system.

In addition, when the tire inflation pressure of the running car is insufficient, the tire inflation pressure monitoring system warns the driver, the driver has a cumbersome problem of taking emergency measures such as turning on the emergency light, reducing the speed of the car and standing the car on the shoulder. .

The present invention has been proposed to solve the above problems, the object of which is to develop a more precise and stable tire pressure monitoring system by verifying all the durability and reliability of the tire pressure monitoring system while the vehicle is driving or stopping. To provide a tire pressure control device.

Another object of the present invention is to provide a tire inflation pressure control device that can eliminate the hassle of injecting air into a tire after stopping a vehicle when the running tire pressure of the automobile is insufficient.

Still another object of the present invention is to provide a tire inflation control device which can prevent the performance of a brake from being deteriorated or the tire from being flattened and connected to a traffic accident by lowering the inflation pressure of the tire while the vehicle is driving.

Still another object of the present invention is to provide a tire inflation pressure control device which detects an inflation pressure of individual tires when the vehicle is stopped or while driving, and controls the tire in an appropriate state when the inflation pressure of the tire is low.

It is still another object of the present invention to provide a tire inflation pressure control device that allows impurities to be removed before air enters the tire and precisely controls the amount of air introduced into the tire.

Still another object of the present invention is to provide a tire inflation pressure control device which can prevent a safety accident by cutting off the power supply when a problem occurs in the power source due to external factors while the vehicle is driving.

Tire pressure control device of the present invention for achieving the above object, the pneumatic system unit for generating the air required to maintain the air pressure state of the tire mounted on the vehicle to the proper state to allow the air to flow into or out of the tire; A pneumatic state detection means mounted on a tire wheel and configured to detect a pneumatic state of a tire into which air is introduced or leaked by the pneumatic system unit while the vehicle is being driven or stopped; System control means for receiving the air pressure state of the tire from the air pressure state detection means as a predetermined signal and displaying the same through a monitor, and supplying power to the pneumatic system unit; And an air inflow and outflow means detachably provided on the tire wheel to receive air from the pneumatic system unit and allow air to flow in or out of the tire while the vehicle is running or stopped. Characterized in that comprises a.

In addition, the pneumatic system unit, the user to set the air pressure regulator; A plurality of compressors for generating air required for four tires of an automobile; If the air pressure is equal to or higher than the value set by the regulator, the contact with the compressor is cut off and the operation of the compressor is stopped. If the air pressure is lower than the value set by the regulator, the contact with the compressor is connected to operate the pressure switch. ; A filter for removing impurities in the air generated by the compressor; A tank for storing air from which impurities are removed from the filter; A valve unit connected to the tank, the valve unit comprising one or more inlet valves for introducing air into each tire and one or more outlet valves for outflowing air from the tires; And a pressure sensor for detecting the air pressure state of the tire and displaying the same through a monitor and comparing the signal detected by the air pressure state detection means to verify the reliability of the air pressure state detection means. It is preferable to comprise a.

In addition, it is effective that the inlet valve comprises a first inlet valve for introducing a large amount of air at high speed and a second inlet valve for introducing a small amount of air at low speed.

In addition, the outlet valve is preferably composed of a first outlet valve for outflowing a large amount of air at high speed, and a second outlet valve for outflowing a small amount of air at low speed.

In addition, it is effective that the inlet valve and the outlet valve are made of a solenoid valve.

The pneumatic condition detecting means may include a pneumatic sensor mounted on a tire wheel of a vehicle to detect pneumatic pressure of individual tires and transfer the pneumatic pressure of the tire to the system control means by a predetermined signal. desirable.

In addition, the signal is a short-range wireless signal or a wired signal, it is effective to be transmitted to the electronic control unit (ECU) of the system control means.

The system control unit may include an electronic control unit (ECU), a micro processing unit (MPU), and a signal input / output unit for receiving a signal from the air pressure state detection unit and converting the signal into various data values. A signal processor including a board; A notebook computer for visually displaying the signal processed by the signal processor; A power supply for supplying power required during the driving test; And a circuit breaker for shutting off the power supply when a problem occurs in the power supply. It is preferable to comprise a.

In addition, the air inlet and outlet means, the disk is fastened by a mechanical fastening method to the tire wheel (disk) to rotate integrally with the wheel; A flange fastened to one surface of the disk to rotate integrally with the disk and having a conduit so as to communicate with the air pressure detecting means; A body coupled to the flange by a predetermined coupling and having a conduit configured to allow air to flow in or out; And a rotating body fastened to the flange and provided in the coupling so as to rotate integrally with the flange and having a conduit formed so that the conduit formed on the body and the conduit formed on the flange communicate with each other. It is effective to comprise a.

In addition, it is preferable that bearings are provided at both ends of the coupling.

In addition, it is effective that the bearing is a ball bearing.

In addition, the coupling is preferably a sleeve (sleeve).

In addition, it is effective that a sealing member is further included between the rotating body and the body.

Moreover, it is preferable that the said rotating body is a spool.

Hereinafter, a tire air pressure control device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 are views for showing a tire inflation pressure control apparatus according to the present invention, Figure 1 is an overall configuration of the tire inflation pressure control apparatus according to the present invention, Figure 2 is a block of the tire inflation pressure control apparatus according to the present invention Figure 3 is a pneumatic circuit diagram of the tire inflation pressure control apparatus according to the present invention, Figure 4 is a schematic plan view showing a pneumatic system part in the tire inflation pressure control apparatus according to the present invention, Figure 5 is an air inlet in the tire inflation pressure control apparatus according to the present invention And a schematic cross-sectional view showing a state in which the outlet means is mounted on the tire wheel, FIG. 6 is an exploded perspective view showing the air inflow and outflow means in the tire air pressure control device according to the present invention.

As shown in FIG. 1, the tire inflation pressure control apparatus according to the present invention includes a pneumatic system unit 10, a pneumatic state sensing means 20, a system control means 30, and an air inflow and outflow means 40. .

The pneumatic system unit 10 is mounted on a vehicle as shown in FIG. 1 to generate the air necessary for maintaining the air pressure state of the tire T in a proper state so that the air flows into or out of the tire T. As shown in FIG. 2, a regulator 11, a compressor 12, a pressure switch 13, a filter 14, a tank 15, a valve unit 16, and a pressure sensor 18 are included. Is done.

The regulator 11 is for setting the air pressure by the user as shown in FIG. 2, and the opening and closing operation of the pressure switch 13 to be described later is performed according to the air pressure set in the regulator 11.

In addition, the compressor (12) is connected to the pressure switch 13 to be described later, as shown in Figure 4 is to generate the air necessary for the tire, to supply sufficient air to the four tires It is preferable to be provided in plurality.

In addition, the pressure switch 13 stops the operation of the compressor 12 by breaking the contact with the compressor 12 when the air pressure is equal to or greater than the value set by the regulator 11, as shown in FIG. If the air pressure is less than or equal to the value set by the regulator 11, the contact with the compressor 12 is connected to operate the compressor 12.

In FIG. 4, reference numeral 13a denotes a pressure gauge.

On the other hand, the filter 14 is to remove impurities in the air generated in the compressor 12, as shown in Figure 2 or 3, the tank 15 is the impurities are removed from the filter 14 It is to store air.

In addition, the valve unit 16 is connected to the tank 15, as shown in Figure 2 or 3, and one or more inlet valve (16a) for introducing air to each tire and for outgoing air from the tire Consists of at least one outlet valve (16b), the inlet valve (16a) is composed of a first inlet valve for introducing a large amount of air at high speed and a second inlet valve for introducing a small amount of air at low speed The outflow valve 16b includes a first outflow valve for outflowing a large amount of air at a high speed and a second outflow valve for outflowing a small amount of air at a low speed.

Such inlet valve 16a and outlet valve 16b are preferably made of a solenoid valve.

That is, the valve unit 16 in the present invention consists of a total of four solenoid valves in each tire as shown in FIG. 3 and consists of a total of 16 solenoid valves, as shown in FIG. It is directly connected to the signal processing unit 31 of the tire. If the air pressure control of the tire is operated by the air inlet valve and the outlet valve using only one solenoid valve, it is possible to accurately control the air pressure of the tire regardless of the precise control. There will be no.

On the other hand, the pressure sensor 18 is to verify the reliability of the air pressure state detection means 20 to be described later by detecting the air pressure state of the tire and displayed on the monitor as shown in Figure 2, the individual air pressure of each tire It is mounted on each tire to detect the condition.

As described above, by integrating the components constituting the pneumatic system unit 10 in one place, it is possible to solve the problem of miniaturization and weight reduction of the equipment.

In addition, as shown in FIG. 1, the pneumatic condition detecting means 20 is mounted on a tire wheel and tires T inflowed or outflowed by the pneumatic system unit 10 while the vehicle is running or stopped. To detect the pneumatic state of the tire, the pneumatic state of the tire (T) comprises a pneumatic sensor for transmitting to the system control means 30 to be described later by a predetermined signal.

That is, as shown in FIG. 5, the pneumatic sensor 20 is attached to the nozzles WN of the four tire wheels W, respectively, to detect the air pressure state flowing in or out through the nozzle WN. .

The signal is a short-range wireless signal such as radio frequency (RF), infrared (IR), Bluetooth, and the like, and is transmitted to an electronic control unit (ECU) 32 of the system control means 30 to be described later. .

In addition, the pneumatic state detection means 20 may be connected to the system control means 30 to be described later in a wired manner to detect the pneumatic state of the tire to be transmitted as an electrical signal to the system control means 30 to be described later.

Meanwhile, as shown in FIG. 1, the system control means 30 receives the pneumatic state of the tire T from the pneumatic state detection means 20 as a predetermined signal and displays it on a monitor of the notebook computer 35. A signal processor 31 for supplying power to the pneumatic system unit 10; Notebook computer 35; A power supply unit 36; And a circuit breaker (not shown).

As shown in FIG. 2, the signal processor 31 receives an signal from the air pressure state detecting means 20 and converts the signal into various data values. A micro processing unit (MPU) 33, a signal input / output board 34, and the like.

In addition, the notebook computer 35 is for visually displaying a signal processed by the signal processing unit 31 as shown in FIG. 1, and the power supply unit 36 is for supplying power required while driving.

The main power supply of the tire pneumatic pressure control device according to the present invention uses a DC 12V battery, but the battery is mainly used only for the compressor, and thus cannot be used simultaneously with the pneumatic sensor and the solenoid valve.

An error occurs in the measured value of the pneumatic sensor due to various noises generated during operation of the compressor, so that a separate power supply unit is used.

In addition, the tire pressure control device according to the present invention requires a separate AC line. Accordingly, an inverter is used to receive the battery power and convert the battery into AC.

The tire air pressure control device of the present invention is controlled by using a notebook computer in a car interior while driving a car. In order to prevent the notebook battery's own battery from being discharged and down, AC power is supplied to the notebook computer using the inverter. Will be supplied.

In addition, the circuit breaker (not shown) is to cut off the power supply when a problem occurs in the power supply unit 36, and when a problem occurs in the power supply unit 36 due to external factors while driving the vehicle, This is to prevent accidents that can cause damage.

That is, wireless signals such as radio frequency (RF), infrared ray (IR), Bluetooth, and the like transmitted from the pneumatic sensor 20 of the pneumatic state sensing means are mounted inside the vehicle as shown in FIG. 1. Data values are transmitted to the 32, and the electronic control device 32 is ready to send the pressure, temperature, tire condition, and various alarm signals received from the pneumatic sensor 20 to the micro arithmetic processing device 33. Will be

The micro arithmetic unit 33 is prepared to transmit the various data values received from the electronic control device 32 to the display device or notebook computer 35.

Meanwhile, the signal input / output board 34 uses NI USB Digital I / O Board, NI USB DAQ Board, and Digital I / O Signal Conditioner Board of National Instruments, which are already commercially available and widely used.

As shown in FIG. 2, the NI USB Digital I / O Board is connected to the notebook computer 35 by USB and operates the Digital I / O Signal Conditioner Board.

In addition, the NI USB DAQ Board is connected to the notebook computer 35 by USB and receives the value of the pressure sensor 18 of the pneumatic system unit 10.

In addition, the Digital I / O Signal Conditioner Board is connected to the NI USB Digital I / O Board to operate and serves to operate the solenoid valve.

On the other hand, as shown in Figure 1, the air inlet and outlet means 40 is detachably provided on the wheel of the tire (T) is provided with air from the pneumatic system unit 10 receives the air from the tire (while driving or stopping the vehicle ( A disk 41 for inflowing air into or out of the tire T, as shown in FIG. 5 or 6; Flange 42; Body 44; And a rotating body 46.

As shown in FIG. 5, the disk 41 is fastened by a mechanical fastening method, that is, by a fastening bolt BT, to the wheel nut NT formed on the tire wheel W and rotated integrally with the wheel W. As shown in FIG. It is to be made of a lightweight material such as aluminum.

In addition, as shown in Figure 5, the flange 42 is fastened to one surface of the disk 41 by a fastening bolt (BT) is integrally rotated with the disk 41 and the pneumatic state detection means 20 and As shown in Fig. 6, the conduit 42a is formed to communicate with, and functions as a rotating shaft of the air inflow and outflow means.

In addition, the body 44 is coupled to the flange 42 and the predetermined coupling (coupling) 43, as shown in Figure 5 or 6, and the conduit 44a is formed so that air flows in or out As the pipe line 44a, a pneumatic pipe is fitted to communicate with the compressor 12.

5 or 6, the bearing 45 is provided at both ends of the coupling 43, so that the body 44 is fixed even if the flange 42 and the coupling 43 rotate. Will remain intact.

In this case, the bearing 45 is preferably a ball bearing, and the coupling 43 is effectively made of a sleeve.

In addition, the upper end of the body 44, as shown in Figure 5 by covering the closing cap 48 to prevent the air from leaking to the outside, it is possible to prevent foreign matters from entering the body 44 will be.

Meanwhile, as shown in FIG. 5 or 6, the rotating body 46 is provided in the coupling 43 so as to be engaged with the flange 42 and integrally rotate with the flange 42 and the body 44. The pipe line 46a is formed so that the pipe line 44a formed in the above) and the pipe line 42a formed on the flange 42 communicate with each other, and the rotating body 46 is preferably a spool.

In addition, as shown in FIG. 5, the rotor 46 and the body 44 further include a sealing member 47, such as an o-ring or a gasket, to allow air to leak to the outside. Can be prevented.

Air inflow and outflow means 40 made in this way can be employed in all kinds of vehicles by being detachably provided on the tire wheel (W), even when the car is running due to the air inflow and outflow means 40 There is an effect that can maintain the pneumatic state of the proper state.

Referring to the operation of the tire pressure control device of the present invention having the configuration as described above are as follows.

As shown in Fig. 2, the user sets an appropriate level of air pressure in the regulator 11, and then the contact of the pressure switch 13 when the air pressure of the tire is higher than or equal to the value set in the regulator 11 when driving or stopping a vehicle. The compressor 12 is disconnected and the operation of the compressor 12 is stopped, and the air in the tire is discharged to the outside by the air inlet and outlet means 40 through the outlet valve 16b that is the solenoid valve. If the air pressure is less than the value set in the regulator 11, the contact of the pressure switch 13 is connected to the compressor 12 to operate the compressor 12, the air generated by the operation of the compressor 12 Passing through the inlet valve (16a) consisting of a solenoid valve connected to each tire individually to be introduced into the tire by the air inlet and outlet means (40).

At this time, the air pressure state in each tire is detected by a pneumatic sensor, which is an air pressure state detecting means 20 mounted on the wheel of each tire T, as shown in FIG. It is visually displayed on the monitor of 35).

On the other hand, as shown in Figure 2 to verify the reliability of the pneumatic state detection means 20, by connecting the pressure sensor 18 provided in the pneumatic system unit 10 to each tire to detect the tire pressure state Then, the system control means 30 causes the tire pressure state to be visually displayed on the monitor of the notebook computer 35.

As described above, by comparing the signal sensed by the pneumatic condition detecting means 20 and the signal sensed by the pressure sensor 18, a more precise and reliable tire air pressure monitoring system may be developed.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

According to the tire inflation pressure control apparatus of the present invention as described above, all the durability and reliability of the tire inflation pressure monitoring system by comparing the signal sensed by the pressure sensor with the signal sensed by the pneumatic condition detection means while the vehicle is running or stopped. By verifying this, it is possible to develop a more accurate and stable tire pressure monitoring system.

In addition, when the running tire pressure of the car is insufficient, the air inflow and outflow means by introducing air into the tire to stop the hassle of having to inject air into the tire after stopping the vehicle.

In addition, by introducing air into the tire by the air inflow and outflow means while the car is running, the air pressure of the tire is lowered, thereby reducing the performance of the brake or preventing the tire from being punctured and connected to a traffic accident.

In addition, by installing a pneumatic sensor to each of the tire wheels to detect the air pressure state of the individual tires when the vehicle is stopped or running, there is an effect that can be controlled to an appropriate state when the air pressure of the tire is low.

In addition, a filter is provided to remove impurities before air enters the tire, and two solenoid valves for introducing air to the tire at high speed and low speed and two solenoid valves for exhausting air from the tire at high speed and low speed are provided. By connecting to the tire has an effect that can precisely control the amount of air flowing into or out of the tire.

In addition, by providing a circuit breaker in the system control means has an effect that can prevent the safety accident by cutting off the power supply when a problem occurs in the power source due to external factors while the vehicle is driving.

Claims (14)

A pneumatic system unit mounted on an automobile to generate air necessary for maintaining an air pressure state of a tire to allow the air to flow into or out of the tire; A pneumatic state detection means mounted on a tire wheel and configured to detect a pneumatic state of a tire into which air is introduced or leaked by the pneumatic system unit while the vehicle is being driven or stopped; System control means for receiving the air pressure state of the tire from the air pressure state detection means as a predetermined signal and displaying the same through a monitor, and supplying power to the pneumatic system unit; And Removably provided to the tire wheel is provided with air from the pneumatic system unit comprises an air inlet and outlet means for introducing air into or out of the tire while driving or stopping the vehicle Tire pressure control device. The method of claim 1, The pneumatic system unit, A regulator for setting air pressure by the user; A plurality of compressors for generating air required for four tires of an automobile; If the air pressure is equal to or higher than the value set by the regulator, the contact with the compressor is cut off and the operation of the compressor is stopped. If the air pressure is lower than the value set by the regulator, the contact with the compressor is connected to operate the pressure switch. ; A filter for removing impurities in the air generated by the compressor; A tank for storing air from which impurities are removed from the filter; A valve unit connected to the tank, the valve unit comprising one or more inlet valves for introducing air into each tire and one or more outlet valves for outflowing air from the tires; And And a pressure sensor for detecting an air pressure state of the tire and displaying the same through a monitor and comparing the signal detected by the air pressure state detecting means to verify the reliability of the air pressure state detecting means. Tire pressure control device. The method of claim 2, The inlet valve, A first inlet valve for introducing a large amount of air at high speed and a second inlet valve for introducing a small amount of air at low speed Tire pressure control device. The method of claim 2, The outlet valve, A first outlet valve for outflowing a large amount of air at high speed and a second outflow valve for outflowing a small amount of air at low speed Tire pressure control device. The method of claim 2, The inlet valve and outlet valve, Consisting of solenoid valve Tire pressure control device. The method of claim 1, The air pressure state detection means, And a pneumatic sensor mounted on each of the tire wheels of the vehicle to detect an air pressure state of an individual tire and transmitting the air pressure state of the tire to the system control means by a predetermined signal. Tire pressure control device. The method of claim 6, The signal is a short range wireless signal or a wired signal, which is transmitted to an electronic control unit (ECU) of the system control means. Tire pressure control device. The method of claim 1, The system control means, It includes an electronic control unit (ECU), a micro processing unit (MPU) and a signal input / output board for converting the signal from the air pressure state detection means into various data values A signal processor; A notebook computer for visually displaying the signal processed by the signal processor; A power supply for supplying power required during the driving test; And It includes a circuit breaker for shutting off the power supply when a problem occurs in the power supply Tire pressure control device. The method of claim 1, The air inlet and outlet means, A disk fastened to a tire wheel by a mechanical fastening method and integrally rotating with the wheel; A flange fastened to one surface of the disk to rotate integrally with the disk and having a conduit so as to communicate with the air pressure detecting means; A body coupled to the flange by a predetermined coupling and having a conduit configured to allow air to flow in or out; And A rotating body provided in the coupling to be integrally rotated with the flange and integrally rotating with the flange, the rotating body having a conduit formed so that the conduit formed on the body and the conduit formed on the flange communicate with each other. Tire pressure control device. The method of claim 9, At both ends of the coupling, With bearing Tire pressure control device. The method of claim 10, The bearing is characterized in that the ball bearing Tire pressure control device. The method of claim 9 or 10, The coupling is, Characterized in that the sleeve (sleeve) Tire pressure control device. The method of claim 9, Between the rotating body and the body, Sealing member is further included Tire pressure control device. The method of claim 9, The rotating body, Characterized in that the spool (spool) Tire pressure control device.

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