CN215596533U - Pneumatic travel control valve for vehicle seat - Google Patents

Abstract

The utility model discloses a pneumatic stroke control valve for a vehicle seat, which comprises a valve body, wherein the valve body is provided with an air inlet end, an air charging end and an air discharging end, an air inlet opening and closing mechanism is arranged on a communication path of the air inlet end and the air charging end to selectively open or close an air charging channel, and an air discharging opening and closing mechanism is arranged on the communication path of the air charging end and the air discharging end to selectively open or close an air discharging channel; when the control valve works, one of the inflation channel and the exhaust channel is in a conduction state, and the other one of the inflation channel and the exhaust channel is in a closed state. Through the control to the valve body subassembly, realize that the valve body aerifys and exhausts seat pneumatic spring, realize seat lift function to and trigger the valve body and aerify and realize pneumatic spring absorbing function at vehicle vibrations in-process.

Description

Pneumatic travel control valve for vehicle seat

Technical Field

The utility model relates to a pneumatic travel control valve for a vehicle seat.

Background

The existing automobile seat lifting control mechanism mainly has two forms, one is an electric lifting control mechanism, is applied to a passenger automobile seat, and mainly drives a gear to rotate by a motor, and the gear and a rack perform relative motion matching to achieve the purpose of lifting and descending the seat. The other type is a pneumatic control mechanism, is applied to commercial vehicle seats, and mainly realizes the lifting and the lowering of the seats by controlling the valve body to carry out inflation and deflation operation on a pneumatic spring below the seats by means of the air source pressure of the whole vehicle. At the present stage, the commercial vehicle provides higher requirements for the comfort and the operation convenience of the seat, but the existing seat mainly meets the height adjustment requirement and generally has no damping function.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a pneumatic stroke control valve for a vehicle seat.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a pneumatic travel control valve for a vehicle seat comprises a valve body, wherein the valve body is provided with an air inlet end, an air charging end and an air discharging end, an air inlet opening and closing mechanism is arranged on a communication path of the air inlet end and the air charging end to selectively open or close an air charging channel, and an air discharging opening and closing mechanism is arranged on a communication path of the air charging end and the air discharging end to selectively open or close an air discharging channel; when the control valve works, one of the inflation channel and the exhaust channel is in a conduction state, and the other one of the inflation channel and the exhaust channel is in a closed state.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat provided by the present invention, the intake opening/closing mechanism includes an intake air-tight valve chamber and an intake control valve chamber; the air inlet of the air inlet sealing valve cavity is communicated with the air inlet end and the air outlet and is communicated with the inflation end, an air inlet sealing gasket and a first resetting piece which are positioned at the air outlet are arranged in the air inlet sealing valve cavity, and the first resetting piece is used for resetting the air inlet sealing gasket; and an air inlet control rod for jacking the air inlet sealing gasket is arranged in the air inlet control valve cavity, and the air inlet control rod is arranged in the air inlet control valve cavity in a sliding manner.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat provided by the present invention, a first V-shaped gasket, a first gasket ring, and a third restoring member are further disposed in the intake control valve chamber, the first gasket ring is disposed at a first rod outlet of the intake control valve chamber, the first V-shaped gasket is disposed between the first gasket ring and the first rod outlet, a lower end of the intake control rod passes through the first gasket ring and the first V-shaped gasket ring and extends to or out of the first rod outlet, and the third restoring member is fitted over the intake control rod to restore the intake control rod.

In a preferred embodiment of the pneumatic stroke control valve for a vehicle seat according to the present invention, the intake control rod has a tapered rod structure, and the width of the side closer to the intake valve chamber is smaller.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat provided by the present invention, a relief hole is provided between the intake end and the intake sealing valve chamber.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat provided by the present invention, the exhaust opening and closing mechanism includes an exhaust seal valve chamber and an exhaust control valve chamber; an exhaust port of the exhaust sealing valve cavity is communicated with the exhaust end and an air inlet is communicated with the inflation end, an exhaust sealing gasket and a second reset piece which are positioned at the exhaust port are arranged in the exhaust sealing valve cavity, and the second reset piece is used for resetting the exhaust sealing gasket; an exhaust control rod used for jacking the exhaust sealing gasket is arranged in the exhaust control valve cavity, and the exhaust control rod is arranged in the exhaust control valve cavity in a sliding mode.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat provided by the present invention, a second V-shaped gasket, a second gasket ring, and a fourth reset member are further disposed in the exhaust control valve chamber, the second gasket ring is disposed at a second rod outlet of the exhaust control valve chamber, the second V-shaped gasket is disposed between the second gasket ring and the second rod outlet, a lower end of the exhaust control rod passes through the second gasket ring and the second V-shaped gasket ring and extends to or from the second rod outlet, and the fourth reset member is sleeved on the exhaust control rod to reset the exhaust control rod.

In a preferred embodiment of the pneumatic stroke control valve for a vehicle seat according to the present invention, the exhaust control rod has a tapered rod structure, and the width of the exhaust control rod decreases toward the exhaust seal valve chamber.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat according to the present invention, a T-shaped passage is provided in the valve body, and three ends of the T-shaped passage communicate with the intake end, the inflation end, and the exhaust end, respectively.

As a preferable embodiment of the pneumatic stroke control valve for a vehicle seat provided by the present invention, the control valve further includes a fixing bracket, a control cam, a control pressure lever, and an interlocking buckle, the fixing bracket is mounted on a seat supporting scissor bracket, the valve body is mounted on the fixing bracket, the control pressure lever is rotatably connected to the fixing bracket, the control cam is rotatably connected to the fixing bracket through the interlocking buckle, two ends of the control cam are respectively abutted against upper sides of two ends of the control pressure lever, and lower sides of two ends of the control pressure lever are respectively abutted against an intake opening/closing mechanism and an exhaust opening/closing mechanism of the valve body.

Compared with the prior art, the utility model has the following beneficial effects:

the valve body is provided with an air inlet end, an air charging end and an air discharging end, wherein an air inlet opening and closing mechanism is arranged on a communication path of the air inlet end and the air charging end to selectively conduct or close an air charging channel, and an air discharging opening and closing mechanism is arranged on a communication path of the air charging end and the air discharging end to selectively conduct or close an air discharging channel; when the control valve works, one of the inflation channel and the exhaust channel is in a conduction state, and the other one of the inflation channel and the exhaust channel is in a closed state. Through the control to the valve body subassembly, realize that the valve body aerifys and exhausts seat pneumatic spring, realize seat lift function to and trigger the valve body and aerify and realize pneumatic spring absorbing function at vehicle vibrations in-process.

Compared with the existing electric lifting mechanism, the control valve of the utility model reduces the number of parts, and reduces the weight and cost of the whole vehicle; the sealing performance and the connection reliability of the valve body are improved; the shock absorption function of the seat is realized, and the riding comfort requirements of a driver and passengers are met; simple structure, valve body control are accurate. Compared with the existing pneumatic control mechanism, the control valve has the advantages of good sealing performance, sensitive response, long service life, high reliability after long-time use, small volume, light weight and the like.

Drawings

In order to illustrate the present application or prior art more clearly, a brief description of the drawings needed for the description of the embodiments or prior art will be given below, it being clear that the drawings in the following description are some embodiments of the present application and that other drawings can be derived from them by a person skilled in the art without inventive effort.

Fig. 1 is a schematic structural view of a pneumatic stroke control valve for a vehicle seat of the present invention;

fig. 2 is a schematic structural view of an air stroke control valve for a vehicle seat of the present invention, in which one side of a fixing bracket is not shown;

FIG. 3 is an exploded schematic view of the pneumatic travel control valve for a vehicle seat of the present invention;

FIG. 4 is a schematic structural view of a valve body in an air stroke control valve for a vehicle seat according to the present invention;

FIG. 5 is a side view of the valve body of the present invention;

FIG. 6 is a cross-sectional view taken at A-A of FIG. 5;

FIG. 7 is a cross-sectional isometric view taken at A-A in FIG. 5.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

Referring to fig. 1 to 7, the embodiment provides a pneumatic travel control valve for a vehicle seat, which includes a valve body 1, a fixing bracket 2, a control cam 3, a control pressure rod 4 and an interlocking buckle 5, wherein the starting travel control valve is installed at the lower part of a seat cushion, specifically, two opening circular holes on the fixing bracket 2 are respectively installed on two cross beams of a scissors bracket, and when the seat rises or falls and fluctuates, the angle of the fixing bracket 2 changes along with the scissors bracket. The valve body 1 is installed on the fixing bracket 2, the control compression bar 4 is rotatably connected on the fixing bracket 2, the control cam 3 is rotatably connected on the fixing bracket 2 through the interlocking buckle 5, two ends of the control cam 3 are respectively in corresponding butt connection with upper sides of two ends of the control compression bar 4, and lower sides of two ends of the control compression bar 4 are respectively in butt connection with an air inlet opening and closing mechanism 14 and an air exhaust opening and closing mechanism 15 of the valve body 1. Therefore, when the angle of the fixing bracket 2 changes, the angle of the control cam 3 is driven to change, and the air inlet opening and closing mechanism 14 or the air exhaust opening and closing mechanism 15 is controlled through the transmission of the control pressure rod 4.

Referring to fig. 4-7, the valve body 1 has an air inlet 11, an air charging end 12 and an air discharging end 13, an air inlet opening/closing mechanism 14 is disposed on a communication path between the air inlet 11 and the air charging end 12 to selectively open or close an air charging channel (i.e., the air inlet 11 to the air charging end 12), and an air discharging opening/closing mechanism 15 is disposed on a communication path between the air charging end 12 and the air discharging end 13 to selectively open or close an air discharging channel (i.e., the air charging end 12 to the air discharging end 13); when the control valve works, one of the charging channel and the discharging channel is in a conducting state, and the other one is in a closed state.

Further, the intake opening and closing mechanism 14 includes an intake sealing valve chamber 141 and an intake control valve chamber 142 which are communicated with each other. The air inlet 1411 of the air inlet sealing valve cavity 141 is communicated with the air inlet end 11 and the air outlet 1412 to be communicated with the air charging end 12, an air inlet sealing gasket 1413 and a first restoring piece 1414 are arranged in the air inlet sealing valve cavity 141, wherein the air inlet sealing gasket 1413 is positioned at the air outlet 1412 and used for sealing the air outlet 1412; two ends of the first resetting piece 1414 are respectively abutted against the air inlet gasket 1413 and the air inlet 1411, and are used for resetting the air inlet gasket 1413 to the air outlet 1412. In specific implementation, when the air inlet gasket 1413 is forced to be pushed open and separated from the air outlet 1412, the air outlet 1412 is opened, and the air inlet end 11 and the air charging end 12 are communicated; when the air inlet gasket 1413 is not stressed any more, the first restoring member 1414 restores the air inlet gasket 1413 to abut and seal the air outlet 1412, i.e., closes the air outlet 1412 and separates the air inlet end 11 from the air charging end 12.

An air inlet control rod 1421 is arranged in the air inlet control valve cavity 142, and the air inlet control rod 1421 is slidably arranged in the air inlet control valve cavity 142 and used for ejecting the air inlet gasket 1413. Further, a first V-shaped sealing gasket 1422, a first sealing retainer ring 1423 and a third reset member 1424 are further arranged in the intake control valve cavity 142, the first sealing retainer ring 1423 is arranged at the first rod outlet 1425 of the intake control valve cavity 142, the first V-shaped sealing gasket 1422 is arranged between the first sealing retainer ring 1423 and the first rod outlet 1425, the first sealing retainer ring 1423 prevents the first V-shaped sealing gasket 1422 from being jacked up and changed in position when the pressure is high, and the design can meet the requirement of ensuring the sealing performance of the intake control valve cavity 142 and the valve body 1 when the intake control rod 1421 moves up and down. The lower end of the air inlet control rod 1421 passes through the first gasket 1423 and the first V-shaped gasket 1422 to extend to or beyond the first rod outlet 1425, the third resetting piece 1424 is sleeved on the air inlet control rod 1421 to reset the air inlet control rod 1421, and the upper end of the air inlet control rod 1421 passes through the first pressure rod port 1426 of the air inlet control valve cavity 142 and extends to protrude, so that the control pressure rod 4 applies force to the air inlet control rod 1421.

A pressure reducing hole is arranged between the air inlet end 11 and the air inlet sealing valve cavity 141, and the pressure reducing hole plays a role in reducing the pressure of an air source. The pressure relief vent diameter is preferably, but not limited to, 0.7mm, and may be provided in other diameter sizes.

The exhaust opening and closing mechanism 15 includes an exhaust seal valve chamber 151 and an exhaust control valve chamber 152. The exhaust port 1512 of the exhaust seal valve cavity 151 is communicated with the exhaust end 13 and the air inlet 1511 to be communicated with the inflation end 12, an exhaust seal gasket 1513 and a second resetting piece 1514 which are located at the exhaust port are arranged in the exhaust seal valve cavity 151, and two ends of the second resetting piece 1514 are respectively abutted to the exhaust seal gasket 1513 and the exhaust seal valve cavity 151 and used for resetting the air inlet seal gasket 1413 to the exhaust port 1512. In specific implementation, when the exhaust gasket 1513 is forced to be pushed open, the exhaust gasket is separated from the exhaust port 1512, that is, the exhaust port 1512 is opened, and the exhaust end 13 and the inflation end 12 are connected; when the inlet gasket 1413 is no longer under force, the second reset 1514 resets the outlet gasket 1513 against sealing the outlet 1512, i.e., closes the outlet 1512, blocking the outlet end 13 from the inlet end 12.

An exhaust control rod 1521 is arranged in the exhaust control valve cavity 152, and the exhaust control rod 1521 is arranged in the exhaust control valve cavity 152 in a sliding mode and used for jacking the exhaust sealing gasket 1513. Further, still be provided with second V type sealed 1522, second sealing ring 1523 and fourth piece 1524 that resets in the exhaust control valve chamber 152, second sealing ring 1523 sets up the second play pole mouth 1525 of exhaust control valve chamber 152, second V type sealed 1522 sets up between second sealing ring 1523 and the second play pole mouth 1525, and second V type sealed 1522 is by the jack-up position change when the effect of second sealing ring 1523 prevents that pressure is high, and the design can satisfy exhaust control rod 1521 guarantees when the up-and-down motion in the exhaust control valve chamber 152 and the leakproofness requirement of valve body 1. The lower end of the exhaust control rod 1521 passes through the second sealing retainer ring 1523 and the second V-shaped sealing gasket 1522 to extend to or out of the second rod outlet 1525, and the fourth resetting piece 1524 is sleeved on the exhaust control rod 1521 to reset the exhaust control rod 1521; the upper end of the exhaust control rod 1521 passes through the second pressure rod port 1526 of the exhaust control valve cavity 152 and extends and protrudes, so that the control pressure rod 4 can apply force to the exhaust control rod 1521.

The intake control rod 1421 has a tapered rod structure, and the width of the side closer to the intake sealed valve cavity 141 is smaller. Similarly, the exhaust control rod 1521 is a tapered rod structure, and the width of the side closer to the exhaust seal valve chamber 151 is smaller. So design, can grow with the outer diameter size of V type sealed pad (first V type sealed pad 1422 and the sealed 1522 of second V type) complex when pressing down, increase the axial seal effect, V type sealing washer when pressure increase, the outside expansion of both lips plays the effect of sealed benefit reinforcing.

A T-shaped or cross-shaped channel 16 is arranged in the valve body 1, the three ends of the T-shaped or cross-shaped channel are respectively communicated with the air inlet end 11, the air charging end 12 and the air discharging end 13, and if the cross-shaped channel has one end, one end is sealed. Due to the design, the internal structure of the valve body 1 is convenient to simplify, and the design of a miniature and compact structure is facilitated.

The working principle of the embodiment is as follows:

when the seat is operated to ascend, the ascending switch is buckled upwards, the control cam 3 is connected with the switch through a brake cable, the brake cable pulls the control cam 3 to change the angle, the control cam 3 presses down the control pressure rod, the rotation angle of the control pressure rod is changed, then the air inlet control rod is triggered to press down, the air inlet control rod pushes the air inlet sealing gasket 1413 of the air inlet sealing valve cavity 141 open, the air outlet 1412 is opened, high-pressure compressed air enters through the air inlet end 11, flows through the air outlet 1412 and finally flows out from the air charging end 12, the air charging end 12 is connected to an air spring at the lower part of the seat through a pipeline, the air spring is inflated to ascend, then the displacement of the seat integrally ascends, when the seat ascends to a certain height, the angle of the scissor bracket changes, meanwhile, the angle of the fixing bracket 2 and the control cam 3 is driven to change, and the control cam 3 and the control pressure rod are restored to a balanced state, the valve body 1 is not pressed down any more, the inflation is not carried out any more, the inflation process is stopped, and the seat does not rise any more.

When the seat is operated to descend, the descending switch is buckled downwards, the brake cable stretches out and is loosened, the reset spring connected with the control cam 3 is in a tensioned state, the angle of the control cam 3 is pulled to change reversely, the control cam 3 is pressed to the other end of the control pressure rod, the angle of the control pressure rod changes reversely, the exhaust control rod is triggered to press downwards, the exhaust control rod pushes the exhaust sealing gasket 1513 open, namely, the exhaust hole 1512 is opened, compressed air in the seat air spring enters through the inflating end 12, flows through the exhaust hole 1512 and is finally discharged outwards to the atmosphere, the seat descends under the action of gravity after the pressure in the pneumatic spring is reduced, when the seat descends to a certain height, the angle of the scissor bracket changes, the angle of the fixing bracket 2 and the angle of the control cam 3 is driven to change, the brake cable returns to the tensioned state again and the balance state of the reset spring, and the control cam 3 does not press downwards any more, the valve body 1 is no longer vented to the outside, the venting process is terminated and the seat is no longer lowered.

When the automobile runs on a bumpy road section, the seat integrally floats up and down, the control switch is not operated at the moment, but the angle of the fixing bracket 2 can be changed along with the change of the angle of the scissors support, the angle of the control cam 3 can be changed along with the change of the angle, the control pressure rod is pressed down, the valve body 1 can inflate and deflate the seat air spring, the bumpy state of the seat is relieved, and the seat shock absorption effect is achieved.

The pneumatic stroke control valve can realize the function of accurately controlling the lifting position of the seat and ensure the damping and buffering functions of the seat through the structural design of the valve body 1 component and the valve body 1 for controlling air intake and exhaust, and is suitable for a vehicle seat pneumatic pipeline assembly system.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the utility model and do not limit the scope of the utility model. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims (10)

1. The pneumatic travel control valve for the vehicle seat is characterized by comprising a valve body, wherein the valve body is provided with an air inlet end, an air charging end and an air discharging end, an air inlet opening and closing mechanism is arranged on a communication path of the air inlet end and the air charging end to selectively open or close an air charging channel, and an air discharging opening and closing mechanism is arranged on a communication path of the air charging end and the air discharging end to selectively open or close an air discharging channel; when the control valve works, one of the inflation channel and the exhaust channel is in a conduction state, and the other one of the inflation channel and the exhaust channel is in a closed state.

2. The pneumatic stroke control valve for a vehicle seat according to claim 1, wherein the intake opening and closing mechanism includes an intake air seal valve chamber and an intake air control valve chamber; the air inlet of the air inlet sealing valve cavity is communicated with the air inlet end and the air outlet and is communicated with the inflation end, an air inlet sealing gasket and a first resetting piece which are positioned at the air outlet are arranged in the air inlet sealing valve cavity, and the first resetting piece is used for resetting the air inlet sealing gasket; and an air inlet control rod for jacking the air inlet sealing gasket is arranged in the air inlet control valve cavity, and the air inlet control rod is arranged in the air inlet control valve cavity in a sliding manner.

3. The pneumatic stroke control valve for the vehicle seat according to claim 2, wherein a first V-shaped gasket, a first gasket ring, and a third reset member are further disposed in the intake control valve chamber, the first gasket ring is disposed at the first rod outlet of the intake control valve chamber, the first V-shaped gasket ring is disposed between the first gasket ring and the first rod outlet, the lower end of the intake control rod passes through the first gasket ring and the first V-shaped gasket ring and extends to or out of the first rod outlet, and the third reset member is sleeved on the intake control rod to reset the intake control rod.

4. The pneumatic stroke control valve for a vehicle seat according to claim 2, wherein the intake control rod has a tapered rod structure, and the width of the side closer to the intake seal valve chamber is smaller.

5. The pneumatic stroke control valve for a vehicle seat according to claim 2, wherein a relief hole is provided between the intake end and the intake sealing valve chamber.

6. The pneumatic stroke control valve for a vehicle seat according to claim 1, wherein the exhaust opening and closing mechanism includes an exhaust seal valve chamber and an exhaust control valve chamber; an exhaust port of the exhaust sealing valve cavity is communicated with the exhaust end and an air inlet is communicated with the inflation end, an exhaust sealing gasket and a second reset piece which are positioned at the exhaust port are arranged in the exhaust sealing valve cavity, and the second reset piece is used for resetting the exhaust sealing gasket; an exhaust control rod used for jacking the exhaust sealing gasket is arranged in the exhaust control valve cavity, and the exhaust control rod is arranged in the exhaust control valve cavity in a sliding mode.

7. The pneumatic stroke control valve for the vehicle seat according to claim 6, wherein a second V-shaped gasket, a second gasket ring, and a fourth reset member are further disposed in the exhaust control valve chamber, the second gasket ring is disposed at a second rod outlet of the exhaust control valve chamber, the second V-shaped gasket is disposed between the second gasket ring and the second rod outlet, a lower end of the exhaust control rod passes through the second gasket ring and the second V-shaped gasket ring and extends to or out of the second rod outlet, and the fourth reset member is sleeved on the exhaust control rod to reset the exhaust control rod.

8. The pneumatic stroke control valve for a vehicle seat according to claim 6, wherein the exhaust control rod has a tapered rod structure, and the width of the side closer to the exhaust seal valve chamber is smaller.

9. The pneumatic stroke control valve for a vehicle seat according to claim 1, wherein a T-shaped passage is provided in the valve body, and three ends thereof communicate with the intake end, the inflation end, and the exhaust end, respectively.

10. The pneumatic stroke control valve for the vehicle seat as claimed in claim 1, further comprising a fixing bracket, a control cam, a control rod and an interlocking buckle, wherein the fixing bracket is mounted on a seat supporting scissor bracket, the valve body is mounted on the fixing bracket, the control rod is rotatably connected to the fixing bracket, the control cam is rotatably connected to the fixing bracket through the interlocking buckle, two ends of the control cam are respectively abutted against upper sides of two ends of the control rod, and lower sides of two ends of the control rod are respectively abutted against an air inlet opening and closing mechanism and an air outlet opening and closing mechanism of the valve body.

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