KR20080037512A - Rotary valve for regulating tire pressure - Google Patents

Abstract

A rotary valve for regulating tire pressure is provided to increase and decrease the internal air pressure of a tire to be adequate for traveling condition and road condition during travel of a vehicle. A rotary valve for regulating tire pressure comprises a rotor(30) rotating with a tire and a wheel assembly and formed with an air passage(31) connected to the interior of the tire, a stator(40) formed with a compressed air passage(41) and a decompressed air passage(42) connected to the air passage, a compression valve(50), and a decompression valve(60). The compression valve includes a first spring(52) and a ball(53) embedded in a first port(51) connected to the compressed air passage. The decompression valve includes a second spring(63) and a valve spool(64) embedded in a second port(61) connected to the decompressed air passage.

Description

ROTARY VALVE FOR REGULATING TIRE PRESSURE

The present invention relates to a rotary valve for adjusting tire air pressure, and in particular, to adjust the tire's internal air pressure with a simple and reliable structure to suit driving conditions and road conditions while the vehicle is being driven, driving stability, rolling resistance, comfort, and traction of the vehicle. The present invention relates to a rotary valve for adjusting tire pressure, which can improve performance.

A tire is a performance component that supports the load of a vehicle and is deeply involved in all movements of the vehicle, such as acceleration and deceleration. The performance of such a tire is greatly influenced by the internal air pressure. For example, EP 147008, U.S. 6943673, U.S. 6941989, U.S. 6498967 and the like have been proposed to control the air pressure of a vehicle while driving. These technologies have been partially applied to agricultural vehicles, commercial vehicles, trucks, buses, and military vehicles for many years in North America, and have been developed for the purpose of increasing mileage of vehicles, increasing work efficiency, and preventing accidents.

In addition, Korean Patent No. 580529 describes a vehicle's behavior posture by actively adjusting the air pressure on the tires provided on the left and right wheels when the vehicle posture becomes unstable due to the action of centrifugal force during turning. The technique which stabilizes and is able to aim at more stable running is proposed.

In these technologies, most of the overall system configuration and external form is determined by the most important element, the rotary valve unit, which depends on the form or application vehicle or conditions of use.

For example, FIG. 1A shows an example of a rotary valve employed in a conventional tire pneumatic control system, and a circuit diagram thereof is shown in FIG. 1B, which includes a check valve function by itself, and a tire according to system control. The internal air pressure can be pressurized or reduced in pressure.

That is, in the case of the tire air pressure control system, the rotary valves FL and FR for controlling the air pressure of the front left and right tires, the rotary valves RL and RR for controlling the air pressure of the rear left and right tires, and the motor M Air compressor C, air tank AT, a plurality of directional valves and the like.

By the way, the rotary valve has a rubber diaphragm (D) having a very complicated shape inside the rotor (R) and the stator (S) which rotates together with the tire and the wheel assembly. Only when the vacuum is applied, the diaphragm D is lifted to reduce the internal air pressure of the tire. Therefore, when the air line is damaged, there are disadvantages in that the vacuum is not well formed and the reaction is slow.

The present invention has been made in consideration of the above-mentioned conventional problems, and according to the driving conditions and road conditions during the driving of the vehicle, by adjusting the tire's internal air pressure with a simple and reliable structure, the steering stability, rotational resistance, comfort, traction of the vehicle An object of the present invention is to provide a rotary valve for adjusting tire pressure, which can improve performance and the like.

The rotary valve for adjusting the tire pressure of the present invention for achieving the above object comprises: a rotor installed to rotate together with the tire and the wheel assembly, the rotor having an air passage communicating with the inside of the tire; A stator having a pressurized air passage and a reduced pressure air passage communicating with the air passage of the rotor; A pressurizing valve having a first port communicating with the pressurized air flow path and an air compressor, the pressure port selectively opening and closing the first port according to an elastic force of a built-in first spring, an internal air pressure of a tire, and an air pressure of an air compressor; And a second port for communicating the reduced pressure air passage and the air compressor, and an atmospheric pressure port for allowing the outside of the reduced pressure air passage to communicate with the outside. Characterized in that it comprises; a pressure reducing valve to selectively open and close according to the air pressure of.

According to the rotary valve for adjusting the tire pressure according to the present invention configured as described above, it is possible to pressurize and depressurize the internal air pressure of the tire if only high pressure compressed air is provided without the need for a complicated structure such as a diaphragm for pressurization and pressure reduction. Therefore, the structure can be simplified. In addition, since the air line is not complicated and there is no need to form a vacuum, durability is improved, so that the reaction is quick, and tire performances such as adjustment stability, rolling resistance, and running stability of the vehicle can be improved.

According to the present invention, as shown in Figs. 3 and 4, the internal air pressure of the tire Pt, the pressure of the compressed air produced by the air compressor Pc, the cross-sectional area of the ball of the pressure valve Ak, the spring of the first spring If the constant is JS1, the first spring displacement is 1, the spring constant of the second spring is JS2, the second spring is displacement is 2, the left cross-sectional area of the spool valve is AS and the right cross-sectional area of the spool valve is ASr. The dynamics of the force acting on the pressure reducing valve are as follows. In particular, the force generated by the spring can be expressed as

_Elastic force of the first spring (force): _フ Ｋ _s1 = Ｋs1 * ｘ1

_Elastic force (force) of the second spring: _{FF Ｋs2} = Ｋs2 * ２2

In addition, when the pressure P acts on area A, since the force acting here is represented by the product of A * P, it can be expressed as follows.

_FPC = PCC * ASR (force of compressed air in the air compressor acting on the spool valve)

F _Pt = _Pt * Asl (Force of internal air pressure of tire acting on spool valve)

Where Ａｓｌ = Ａｓｒ (The left and right areas of the spool are the same)

The pressurization procedure performed in the system can be described as follows through FIGS. 2 and 3.

The air pressure of the compressed air produced by the air compressor is Pc, the internal air pressure of the tire is Pt, the spring force F _Ｋs1 of the first spring generated by the spring constant Ｋs1 and the displacement ｘ1, and the product of the unit area and the working pressure described above With this in mind, the pressurization works as follows.

In other words, the ON / OFF valve 55 provided on the second port 61 side of the pressure regulating unit (PCC) 80 is shut off, so that the first port 51 side of the pressure regulating unit (PCC) is blocked. When the installed ON / OFF valve 54 is opened, the air pressure of the compressed air produced by the air compressor 70 is not applied to the pressure reducing valve 60 of the second port, but the pressure valve of the first port 51 ( 50), air pressure is applied.

At this time, the air compressor 70, the compressed air forces (F _Pt) acting on the force (F _Pc), the internal air pressure of a tire to see than 53 acting on the ball 53 of the pressure valve (50) produced in the If the force of the spring force F _Ｋs1 acting on the ball 53 by the first spring 52 is small, that is, when the following relationship is established, the pressure valve is opened to supply compressed air into the tire.

F _{Pc> Pt} + _{F F Ks1}

Then, when the ON / OFF valve 54 is cut off, the supply of compressed air through the first port is cut off, so the magnitude of the force is changed so that the ball 53 of the pressure valve is moved to the right. It is closed so that the internal air pressure of the tire maintains a constant pressure.

_Pt F + _{F Ks1> F Pc}

The decompression procedure can be described as follows through FIGS. 2 and 4.

Considering that the air pressure of the air compressor is Pc, the tire internal air pressure is Pt, the spring force generated by the spring constant Vs2 and the displacement V2 is _Fss2 , and the product of the unit area and the working pressure is expressed as a force. Works together.

The ON / OFF valve 54 provided on the side of the first port 51 is blocked to block the pressure acting inside the tire. On the other hand, the ON / ON valve 55 provided on the second port 61 side is opened to allow the compressed air to be delivered to the valve spool 64 of the pressure reducing valve.

At this time, the force due to the compressed air (F _Pc) If this larger than the sum of the force (F _Pt) and spring force (F _Ks2) generated by internal tire pressure, the valve spool 64 by the magnitude relation of the power As shown in FIG. 4, the opening O and the atmospheric pressure port 62 formed on one side of the valve spool 64 coincide with each other, thereby reducing the air pressure in the tire.

F _{Pc> Pt} + _{F F Ks2}

Thereafter, when the ON / OFF valve 55 is shut off, the valve spool 64 moves to the right, and the atmospheric pressure port 62 is closed, and the air pressure inside the tire maintains a constant state.

_Pt F + _{F Ks2> F Pc}

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

2 shows a rotary valve for adjusting the tire pressure according to the present invention.

The tire air pressure regulating rotary valve 20 according to the present invention includes a rotor 30, a stator 40, a pressure valve 50, and a pressure reducing valve 60.

The rotor 30 is installed to rotate together with the tire and wheel assembly 10. For example, the rotor 30 has an air passage 31 passing through the center thereof, and the air passage 31 communicates with the inside of the tire.

The stator 40 is installed outside the rotor 30, and the pressurized air flow passage communicating with the air flow passage 31 of the rotor 30 even while the rotor 30 rotates together with the tire and wheel assembly 10. 41 and a reduced pressure air passage 42 are provided. As such a structure, for example, a slip ring structure can be employed.

The stator 40 is provided with a pressure valve 50 and a pressure reducing valve 60, the pressure valve 50 is the agent for communicating the pressurized air flow path 41 and the air compressor 70 of the stator 40 One port 51 is provided. In addition, the pressure reducing valve 60 has a second port 61 for communicating the reduced pressure air passage 42 and the air compressor 70 of the stator 40, and the atmospheric pressure for passing the outside of the reduced pressure air passage 42 to the outside. A port 62 is provided.

The supply of compressed air from the air compressor 70 to the first port 51 and the second port 61 may be performed through the pressure regulating unit 80.

The pressure valve 50 opens and closes the first port 51 to supply the compressed air supplied from the air compressor 70 when the first port 51 is opened to the inside of the tire to increase the internal air pressure of the tire. The inside of the ball 53 is elastically embedded by the first spring 52 therein. Therefore, according to the magnitude of the elastic force of the first spring 52 acting on the ball 53, the force by the internal air pressure of the tire and the force by the air pressure of the air compressor 70, the ball 53 is the first The port 51 is selectively opened and closed.

In addition, the pressure reducing valve 60 is configured to reduce the air pressure inside the tire by discharging air inside the tire to the outside when opening the atmospheric pressure port 62 by opening and closing the atmospheric pressure port 62. The valve spool 64 is elastically embedded by the second spring 63 inside. Therefore, the valve spool having an opening O at one side according to the magnitude of the elastic force of the second spring 63 acting on the valve spool, the force by the tire internal air pressure, and the force by the air pressure of the air compressor 70 ( 64 selectively opens and closes the atmospheric pressure port 62.

For example, as shown in FIG. 3, when the tire is stretched in accordance with the driving condition and the road surface condition while the vehicle is traveling, the internal air pressure of the tire is rapidly changed. In this case, ON / connected to the second port 61 side. The on-off valve 55 shuts off and stops supply of compressed air, and the on / off valve 54 connected to the first port 51 side is opened to allow the compressed air to be supplied into the tire.

At this time, when the force (F _Pc) by the compressed air is greater than the resultant force of the force (F _Pt) and the agent of the first spring the spring force (F _Ks1) generated by internal tire pressure, the pressure of the ball valve type, as follows: The valve 50 is opened to supply compressed air into the tire.

F _{Pc> Pt} + _F F _Ks1

That is, the force generated by the air pressure of the air compressor (70) (F _Pc) is greater than the sum of the first spring 52, the elastic force (F _Ks1) and force (F _Pt) generated by the internal air pressure of the tire At this time, the first spring 52 is compressed toward the pressurized air passage 41 by the ball 53 under the pressure of the compressed air, so that the pressurized air passage 41 is in communication with the air compressor 70 and compressed into the tire. Air can be supplied. On the other hand, the cross-sectional area of the elastic force (F _Ks1) and viewed by the tire inner pressure of the force (F _Pc), the first spring 52 is generated in the cross-sectional area of the ball 53 by the air pressure of the air compressor (70), (Ab) when that is less than the resultant force of the force (F _Pt) occurs in the first spring first port 51 by the restoring force of the 52 is closed. Thus, from the air compressor 70, the supply of compressed air to the tire is cut off .

On the other hand, as shown in FIG. 4, when the elastic force generated by the second spring 63 of the pressure reducing valve (60) F _Ks2 La, _{F Pt} + F _Ks2> when it satisfies _{F Pc,} the atmospheric pressure port (62 ) Is closed. At this time, the first port is closed by the ON / OFF valve 54.

On the other hand, the pressure reducing valve 60 is F _Pc> F _Pt + F is satisfied a _Ks2, the atmospheric pressure port (62) and the opening (O) of the valve spool the air is discharged from the tire internal communication with reduced internal pneumatic tires do. At this time, the first port is blocked by the ON / OFF valve 54.

That is, the force _FPC generated by the air pressure Pc of the air compressor 70 acting on the cross-sectional area of the valve spool 64 is applied to the elastic force _FFS2 of the second spring 63 and the cross-sectional area of the valve spool. greater time than the resultant force of the force (F _Pt) by the internal air pressure of the tire to act, whereby the second spring 63 is compressed into the reduced pressure air flow path 42 by the valve spool 64 receives the pressure of the compressed air, the pressure The air passage 42, the opening O of the valve spool, and the atmospheric pressure port 62 communicate with each other to allow air to be discharged from the inside of the tire to the outside. On the other hand, when a force (F _Pc) caused by the air pressure of the air compressor 70 is smaller than the resultant force of the elastic force (F _Ks2) and force (F _Pt) of a tire inner pressure of the second spring 63, the second The atmospheric pressure port 62 is closed by the restoring force of the spring 63, so that air is discharged from the tire.

Therefore, in the tire valve for regulating tire air pressure according to the present invention, if only a high-pressure compressed air and ON / OFF valve is provided without the need for a complicated structure such as a diaphragm for pressurization and depressurization, Decompression is possible.

1: A is sectional drawing which shows the example of the conventional tire pneumatic pressure regulating rotary valve.

1B is a circuit diagram illustrating an example of a conventional tire pressure control system.

2 is a cross-sectional view showing a rotary valve for adjusting tire pressure according to the present invention.

3 is a view showing an operating state of the pressure valve.

4 is a view showing an operating state of the pressure reducing valve.

<Description of Drawing>

10: tire and wheel assembly, 20: rotary valve,

30: rotor, 31: air flow path,

40: stator, 41: pressurized air flow path,

42: reduced pressure air flow path, 50: pressure valve,

51: first port, 52: first spring,

54: pressurized side ON / OK valve, 55: decompression side ON / OFF valve,

60: pressure reducing valve, 61: second port,

62: atmospheric pressure port, 63: second spring,

70: air compressor, 80: pressure regulating unit (PCB),

JS1: first spring constant, JS2: second spring constant,

ｘ1: first spring displacement, ｘ2: second spring displacement,

AB: Cross section of check valve ball, AS: Left cross section of spool valve,

AS: Right sectional area of the spool valve,

Where Ａｓｌ = Ａｓｒ (The left and right cross-sectional areas of the spool valve are the same)

PC: Air pressure of the air compressor, Pt: Internal air pressure of the tire,

F _Ｋs1: Spring force by the first spring (F _１ss1 = Ｋss1 * ｘ1),

F _bs2: Spring force by the second spring (F _bs2 = bs2 * 2),

_FPC : The force that the compressed air of the air compressor pushes the valve ( _FPC = PC * ASR),

_Pt F: force of the tire internal pressure is acting on the valve _{(F Pt} = _Pt * Asl)

Claims (2)

A rotor 30 installed to rotate together with the tire and wheel assembly 10 and having an air passage 31 communicating with the inside of the tire; A stator 40 having a pressurized air passage 41 and a reduced pressure air passage 42 communicating with the air passage 31; The first spring 52 and the ball 53 are built in the first port 51 communicating with the pressurized air flow passage 41, and the first spring acting in the opposite direction to the ball 53 ( 51) in accordance with the balance between the elastic force _{(F Ks1)} and the force due to the internal air pressure of the tire _{(F Pt)} resultant force _{(F Pt} + _{F Ks1)} and force _{(F Pc)} by the compressed air of the air compressor 70 of the A pressure valve 50 for opening and closing the first port 51; And A second spring 63 and a valve spool 64 are embedded in the second port 61 communicating with the reduced pressure air passage 42, and an atmospheric pressure port 62 is formed at one side of the second port 61. An opening O is formed at one side of the valve spool 64 such that the elastic force F _FS2 of the second spring 63 acting in the opposite direction with respect to the valve spool 64 and the internal air pressure of the tire. (F _Pt) resultant force (F _Pt + F _Ks2) and in the second port 61 of the valve spool 64 in accordance with the balance between the force (F _Pc) by the compressed air of the air compressor 70 of the Rotary valve for adjusting the air pressure of the tire, characterized in that it comprises a; pressure reducing valve (60) to selectively match the atmospheric pressure port (62) and the opening (O). The method of claim 1, The force applied to the ball 53 of the pressure valve 50 When satisfied with the _Pt F + _{F Ks1> F Pc} is the first port 51 is closed, and F _{Pc> Pt} + _{F F} if they meet the _Ks1 is the first port 51 is opened and compressed air is supplied into the tire; Force applied to the valve spool 64 of the pressure reducing valve 60 When satisfied with the _Pt F + _{F Ks2> F Pc} the atmospheric pressure port 62 is closed, F _{Pc> Pt} + _{F F} if they meet the _Ks2 the atmospheric pressure port (62) and the opening (O) that match the rotary valve for adjusting the tire air pressure characterized in that the internal air pressure of the tire pressure.

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