Adjustable driving device for vehicle maintenance

Abstract

The utility model provides an adjustable driving device for vehicle maintenance, which mainly comprises a cylinder body, a piston body and a piston rod, an inner cavity of the cylinder body is divided into an upper cavity and a lower cavity, the adjustable driving device further comprises a stroke adjusting mechanism, the stroke adjusting mechanism comprises an airflow main channel, a channel opening and closing valve and a plurality of stroke adjusting channels, and each stroke adjusting channel is communicated with the inner cavity of the cylinder body. The channel opening and closing valve is used for controlling opening and closing of the stroke adjusting channel; the air inlet and outlet switching mechanism comprises an air inlet channel, an air outlet channel and an air pressure elastic switching assembly, the cylinder body is provided with an air source channel communicated with the lower cavity, the air pressure elastic switching assembly is used for controlling and switching the air source channel to be communicated with the air inlet channel or the air outlet channel, and the airflow main channel is communicated with the air pressure elastic switching assembly; and the descending end point pressure relief mechanism comprises a positioning piece, a pressure relief piece and a pressure relief rod, and when the positioning piece abuts against the pressure relief rod, the pressure relief rod retreats, and the pressure relief channel is communicated with the pressure relief opening. The device is suitable for abnormal sound overhaul of vehicles with different chassis heights.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle repair technical field especially is related to a adjustable drive device for vehicle repair. BACKGROUND

[0002] At present, in the vehicle repair field, when the automobile parts damage will appear abnormal sound, especially individual abnormal sound appears in the bumpy environment condition, it is difficult to determine the abnormal sound position. At present, the following several detection methods are used for detection, one is to adopt manual shaking vehicle detection, which needs multiple people to cooperate, time-consuming and laborious, two is to adopt the way of road test, the repair personnel drive the vehicle to the bumpy special ground to drive detection abnormal sound, which is high in cost and also difficult to determine the specific position.

[0003] Therefore, the market begins to appear through the special detection device for detecting vehicle, which mainly supports the vehicle chassis underside through the simulation device, and reciprocating vibration up and down, simulates the state of vehicle in the bumpy environment, and then detects and determines the abnormal sound condition.

[0004] However, the chassis of the vehicle is different according to the different vehicles, and the cylinder in the actual use process is difficult to meet the repair operation of different vehicles, so it needs to be improved. UTILITY MODEL CONTENTS

[0005] In view of the problems existing in the prior art, the utility model aims at providing a adjustable drive device for vehicle repair, which can be used for abnormal sound repair of vehicles with different chassis heights.

[0006] In order to solve the above problems, the utility model adopts the following technical scheme.

[0007] A kind of adjustable drive device for vehicle repair, including cylinder body, piston body and piston rod, the piston body is coaxially connected with piston rod, the piston body is slidably arranged in cylinder body and separates the inner cavity of cylinder body into upper cavity and lower cavity, characterized by further comprising:

[0008] Stroke adjusting mechanism, the stroke adjusting mechanism includes airflow main channel, channel opening and closing valve piece and several block stroke adjusting channels, each stroke adjusting channel is communicated with the inner cavity of the cylinder body and is arranged along the sliding direction of the piston body, the channel opening and closing valve piece is used to control the communication of any one block stroke adjusting channel and the airflow main channel;

[0009] The air inlet-outlet switching mechanism comprises an air inlet channel, an air outlet channel, and an air pressure elastic switching component, the air inlet channel is used for input of compressed air, the air outlet channel is used for output of compressed air, the cylinder body is provided with an air source channel in communication with the lower cavity, the air pressure elastic switching component is used for controlling switching of the air source channel in communication with the air inlet channel or the air outlet channel, and the air flow main channel is in communication with the air pressure elastic switching component for linkage control of air inlet-outlet switching operation of the air pressure elastic switching component.

[0010] The downstroke end pressure relief mechanism comprises a positioning member, a pressure relief member, and a pressure relief rod, the positioning member is arranged on the piston rod, the pressure relief member is provided with a pressure relief channel and a pressure relief port, the pressure relief channel is in communication with the air flow main channel, and the pressure relief rod is used for opening and closing operation of the pressure relief channel and the pressure relief port, when the positioning member abuts against the pressure relief rod, the pressure relief rod retreats and the pressure relief channel is in communication with the pressure relief port.

[0011] The stroke adjusting mechanism, the air inlet-outlet switching mechanism, and the downstroke end pressure relief mechanism are matched with the cylinder to achieve the effect of adjustable cylinder extension and retraction stroke. In the initial state, compressed air enters through the air inlet channel, under the cooperation of the air inlet-outlet switching mechanism, compressed air enters the lower cavity of the cylinder body from the air source channel, and the compressed air drives the piston body to move upward. When the piston body moves upward to the stroke adjusting channel of the set opening position and is in communication with the lower cavity, the lower cavity is in communication with the air flow main channel, and the compressed air enters the pressure relief channel through the air flow main channel to press the pressure relief rod, so that the downstroke end pressure relief mechanism is in a closed state, and at the same time, the compressed air enters the air pressure elastic switching component through the air flow main channel, the compressed air entering the air pressure elastic switching component controls the air source channel to be in communication with the air outlet channel, and the compressed air in the lower cavity is discharged. Until the piston body moves downward to the end, the positioning member on the piston rod abuts against the pressure relief rod, the pressure relief rod retreats, and then the compressed air in the pressure relief channel is discharged, that is, the compressed air in the air flow main channel and the air pressure elastic switching component in communication with the air flow main channel is discharged together, and under the elastic recovery of the air pressure elastic switching component, the air source channel is converted to be in communication with the air inlet channel, the above steps are repeated, and then the reciprocating operation of the cylinder is realized. Then, according to the actual vehicle maintenance needs, the stroke adjusting channel of different gears can be adjusted, and then the stroke adjustable mode of the driving device is realized, and then the vehicle with different chassis heights is used for abnormal sound maintenance.

[0012] Preferably, the air inlet and outlet switching mechanism further comprises a shaped base, the air inlet channel, the air outlet channel and the air pressure elastic switching assembly are arranged in the shaped base; the air pressure elastic switching assembly comprises an elastic member, a switching valve core, an air pressure cavity and a sliding switching cavity, the air pressure cavity and the sliding switching cavity are arranged in the shaped base and are sealed and separated by the end of the switching valve core, the switching valve core is slidingly installed in the sliding switching cavity for controlling the air inlet channel or the air outlet channel to communicate with the air source channel, the air pressure cavity communicates with the air flow main channel, and the elastic member is used for elastic return of the switching valve core.

[0013] Preferably, the elastic member and the air pressure cavity are arranged at the two axial ends of the switching valve core, and the elastic member is arranged as a compression spring, and when the air outlet channel is in the air outlet state, the compression spring is in an elastic compression state.

[0014] Preferably, the elastic member and the air pressure cavity are arranged at the same side of the switching valve core, and the elastic member is arranged as a tension spring, and when the air outlet channel is in the air outlet state, the tension spring is in an elastic tension state.

[0015] Preferably, the switching valve core is provided with a mounting groove for mounting the elastic member.

[0016] Preferably, the sliding switching cavity comprises a first cavity, a second cavity and a third cavity arranged in sequence, the first cavity communicates with the air outlet channel, the second cavity communicates with the air source channel, and the third cavity communicates with the air inlet channel; the switching valve core comprises a valve rod, a first sealing part, a second sealing part and a third sealing part arranged coaxially, the first sealing part is used for separating the first cavity and the air pressure cavity, the second sealing part is used for separating the first cavity and the second cavity, the third sealing part is used for separating the second cavity and the third cavity, and the second cavity communicates with any one of the first cavity and the third cavity.

[0017] Preferably, the shaped base comprises a shaped body, a first side plate and a second side plate, the air inlet channel, the air outlet channel, the air source channel and the sliding switching cavity are in the shaped body, and the first side plate and the second side plate are arranged at the two sides of the shaped body to seal the two ends of the sliding switching cavity, wherein the air pressure cavity is arranged in the first side plate.

[0018] Preferably, a sliding groove is arranged in the first side plate, an air pressure top plate is slidingly and sealingly arranged in the sliding groove, and the air pressure cavity and the switching valve core are arranged at the two sides of the air pressure top plate.

[0019] Preferably, the number of the channel opening and closing valve pieces is consistent with the number of the stroke adjusting channels, the stroke adjusting mechanism is arranged on a forming block, the airflow main channel and each stroke adjusting channel are formed on the forming block, the forming block is further provided with mounting holes for mounting the channel opening and closing valve pieces, and the mounting holes are coaxially arranged with each stroke adjusting channel.

[0020] Preferably, the forming base and the forming block are sealingly connected through a sealing pipe piece, and the pressure relief piece and the forming block are sealingly connected through an external pipeline.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] 1. The stroke adjusting mechanism, the air inlet and outlet switching mechanism and the downward terminal pressure relief mechanism are arranged to cooperate with the cylinder to realize the effect of adjustable cylinder telescopic stroke, the air inlet and outlet switching mechanism and the downward terminal pressure relief mechanism are used to realize automatic linkage reciprocating operation, the stroke adjusting structure is used to realize the use of different stroke heights of the cylinder, and then the vehicle with different chassis heights is used for abnormal sound maintenance.

[0023] 2. The stroke adjusting mechanism, the air inlet and outlet switching mechanism and the downward terminal pressure relief mechanism are used to realize linkage automatic reciprocating operation through ingenious structural design and simple forming structure, the structure is simple and ingenious, and the whole pneumatic linkage structure is stable. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is a structure schematic view of the adjustable driving device of the embodiment of the application.

[0025] Fig. 2 It is a sectional structure schematic view of the adjustable driving device of the embodiment of the application.

[0026] Fig. 3 It is a local sectional structure schematic view of the adjustable driving device of the embodiment of the application.

[0027] Explanation of reference numerals in the drawing:

[0028] 1, cylinder; 2, piston body; 3, piston rod; 4, upper cavity; 5, lower cavity; 6, main air flow channel; 7, channel opening and closing valve; 8, stroke adjusting channel; 9, air inlet channel; 10, air outlet channel; 11, air source channel; 12, positioning member; 13, pressure relief member; 14, pressure relief rod; 15, pressure relief channel; 16, pressure relief port; 17, switching valve core; 171, valve rod; 172, first sealing part; 173, second sealing part; 174, third sealing part; 18, air pressure cavity; 19, sliding switching cavity; 191, first cavity; 192, second cavity; 193, third cavity; 20, mounting groove; 21, shaped body; 22, first side plate; 23, second side plate; 24, sliding groove; 25, air pressure top plate; 26, shaped block; 27, mounting hole; 28, sealing pipe. DETAILED DESCRIPTION

[0029] The following will be described in detail in combination with the accompanying drawings Figs. 1-3 The application is further described in detail.

[0030] The embodiment of the application discloses an adjustable driving device for vehicle maintenance. Referring to Figs. 1-3 , comprising a cylinder 1, a piston body 2 and a piston rod 3, the piston body 2 is coaxially connected with the piston rod 3, the piston body 2 is slidingly arranged in the cylinder 1 and divides the inner cavity of the cylinder 1 into an upper cavity 4 and a lower cavity 5, further comprising:

[0031] A stroke adjusting mechanism, the stroke adjusting mechanism comprises a main air flow channel 6, a channel opening and closing valve 7 and a plurality of stroke adjusting channels 8, each stroke adjusting channel 8 is in communication with the inner cavity of the cylinder 1 and is arranged along the sliding direction of the piston body 2, the channel opening and closing valve 7 is used to control the communication between any one stroke adjusting channel 8 and the main air flow channel 6;

[0032] An air inlet and outlet switching mechanism, the air inlet and outlet switching mechanism comprises an air inlet channel 9, an air outlet channel 10 and an air pressure elastic switching assembly, the air inlet channel 9 is used for the input of compressed air, the air outlet channel 10 is used for the output of compressed air, the cylinder 1 is provided with an air source channel 11 in communication with the lower cavity 5, the air pressure elastic switching assembly is used to control the communication between the air source channel 11 and the air inlet channel 9 or the air outlet channel 10, the main air flow channel 6 is in communication with the air pressure elastic switching assembly to link and control the air inlet and outlet switching operation of the air pressure elastic switching assembly;

[0033] and a downstroke end pressure relief mechanism, the downstroke end pressure relief mechanism comprising a positioning member 12, a pressure relief member 13 and a pressure relief rod 14, the positioning member 12 being fixed to the piston rod 3, the pressure relief member 13 being provided with a pressure relief passage 15 and a pressure relief port 16, the pressure relief passage 15 being in communication with the airflow main passage 6, the pressure relief rod 14 being used for opening and closing operation of the pressure relief passage 15 and the pressure relief port 16, when the positioning member 12 abuts against the pressure relief rod 14, the pressure relief rod 14 retreats and the pressure relief passage 15 is in communication with the pressure relief port 16. Specifically, the positioning member 12 in the present example is provided as a disc coaxially fixed to the piston rod 3.

[0034] Specifically, the air inlet and outlet switching mechanism further comprises a shaped base, the air inlet passage 9, the air outlet passage 10 and the air pressure elastic switching assembly are all installed in the shaped base; the air pressure elastic switching assembly comprises an elastic member (not shown in the figure), a switching valve core 17, an air pressure cavity 18 and a sliding switching cavity 19, the air pressure cavity 18 and the sliding switching cavity 19 are both opened in the shaped base and are sealed and separated by the end portion of the switching valve core 17, the switching valve core 17 is slidingly installed in the sliding switching cavity 19 for controlling the air inlet passage 9 or the air outlet passage 10 to be in communication with the air source passage 11, the air pressure cavity 18 is in communication with the airflow main passage 6, and the elastic member is used for elastic return of the switching valve core 17.

[0035] In the present example, the elastic member and the air pressure cavity 18 are separately arranged at the two axial ends of the switching valve core 17, and the elastic member is provided as a compression spring, when the air outlet passage 10 is in the air outlet state, the compression spring is in the elastic compression state.

[0036] In another example, the elastic member and the air pressure cavity 18 are both arranged at the same side of the switching valve core 17, and the elastic member is provided as a tension spring, when the air outlet passage 10 is in the air outlet state, the tension spring is in the elastic tension state.

[0037] The switching valve core 17 is provided with a mounting groove 20 for mounting the elastic member.

[0038] Specifically, the sliding switching cavity 19 includes a first cavity 191, a second cavity 192 and a third cavity 193 arranged in sequence, the first cavity 191 is communicated with the exhaust passage 10, the second cavity 192 is communicated with the air source passage 11, and the third cavity 193 is communicated with the air inlet passage 9; the switching valve core 17 includes a valve stem 171, a first sealing part 172, a second sealing part 173 and a third sealing part 174 arranged coaxially, the first sealing part 172 is used to separate the first cavity 191 and the air pressure cavity 18, the second sealing part 173 is used to separate the first cavity 191 and the second cavity 192, and the third sealing part 174 is used to separate the second cavity 192 and the third cavity 193, the second cavity 192 is communicated with any one of the first cavity 191 and the third cavity 193; when the second sealing part 173 seals and separates the first sealing cavity and the second sealing cavity, the third sealing part 174 is positioned, so that the compressed air enters the air source passage 11 from the air inlet passage 9 and then enters the lower cavity 5 of the cylinder body 1; when the third sealing part 174 separates the second sealing cavity and the third sealing cavity, the second sealing part 173 is positioned, and the compressed air in the lower cavity 5 starts to be discharged from the exhaust passage 10.

[0039] Specifically, the shaped base includes a shaped body 21, a first side plate 22 and a second side plate 23, the air inlet passage 9, the exhaust passage 10, the air source passage 11 and the sliding switching cavity 19 are all in the shaped body 21, the first side plate 22 and the second side plate 23 are arranged on the two sides of the shaped body 21 to seal the two ends of the sliding switching cavity 19, wherein the air pressure cavity 18 is arranged in the first side plate 22, a connecting passage (not marked in the figure) communicated with the airflow main passage 6 is arranged on the shaped base, a transition passage (not marked in the figure) for connecting the connecting passage and the air pressure cavity 18 is arranged on the first side plate 22, and a shaping hole (not marked in the figure) is further arranged on the first side plate 22 for the convenience of shaping, and the first side plate 22 can be sealed by a plugging piece (not shown in the figure) subsequently.

[0040] Further, a sliding groove 24 is arranged in the first side plate 22, and an air pressure top plate 25 is sealingly arranged in the sliding groove 24, and the air pressure cavity 18 and the switching valve core 17 are arranged on the two sides of the air pressure top plate 25.

[0041] Specifically, the number of the passage opening and closing valve 7 is consistent with the number of the stroke adjusting passage 8, the stroke adjusting mechanism is arranged on a shaped block 26, the airflow main passage 6 and each stroke adjusting passage 8 are shaped on the shaped block 26, the shaped block 26 is further provided with a mounting hole 27 for mounting the passage opening and closing valve 7, and the mounting hole 27 is coaxially arranged with each stroke adjusting passage 8, in the embodiment, the passage opening and closing valve 7 is a knob valve and is screwed into the mounting hole 27, and the stroke adjusting passage 8 is closed or opened by screwing. Specifically, the number of the passage opening and closing valve 7 and the stroke adjusting passage 8 in the embodiment is 2.

[0042] Further, the forming base is sealingly connected with the forming block 26 through a sealing pipe 28, and the pressure relief member 13 is sealingly connected with the forming block 26 through an external pipeline (not shown in the figure).

[0043] The implementation principle of the adjustable driving device for vehicle maintenance in the embodiment of the application is as follows:

[0044] The entire driving device is placed under the chassis of the vehicle to be maintained, and the upper end of the piston rod 3 is abutted against the chassis of the vehicle, so that the air inlet channel 9 of the driving device is supplied with air.

[0045] In the air inlet state, compressed air enters through the air inlet channel 9, the switching valve core 17 is under the action of the elastic member, the air pressure chamber 18 is not under pressure, the second sealing part 173 seals and separates the first sealing chamber and the second sealing chamber, the third sealing part 174 is in a position allowing, so that the compressed air enters the air source channel 11 from the air inlet channel 9 and then enters the lower chamber 5 of the cylinder body 1, and the compressed air drives the piston body 2 to move upward.

[0046] When the piston body 2 moves upward to the stroke adjustment channel 8 at the set opening gear position and communicates with the lower chamber 5, the lower chamber 5 communicates with the airflow main channel 6, the compressed air enters the pressure relief channel 15 through the airflow main channel 6 to press the pressure relief rod 14, so that the downward end point pressure relief mechanism is in a closed state, and at the same time, the compressed air enters the air pressure chamber 18 of the air pressure elastic switching assembly through the airflow main channel 6, the compressed air entering the air pressure chamber 18 drives the air pressure top plate 25 to slide, and then drives the switching valve core 17 to slide, so that the third sealing part 174 separates the second sealing chamber and the third sealing chamber, the second sealing part 173 is in a position allowing, and the compressed air in the lower chamber 5 begins to be discharged from the air outlet channel 10.

[0047] Until the piston body 2 moves downward to the end point, the positioning member 12 on the piston rod 3 abuts against the pressure relief rod 14, so that the pressure relief rod 14 retreats, and then the compressed air in the pressure relief channel 15 is discharged, that is, the compressed air in the airflow main channel 6 and the air pressure chamber 18 connected therewith is discharged together, the switching valve core 17 is under the action of the elastic member, the air pressure chamber 18 is not under pressure, the second sealing part 173 seals and separates the first sealing chamber and the second sealing chamber, the third sealing part 174 is in a position allowing, so that the compressed air enters the air source channel 11 from the air inlet channel 9 and then enters the lower chamber 5 of the cylinder body 1, and the compressed air drives the piston body 2 to move upward, and the above steps are repeated to realize the reciprocating stretching and contracting of the driving device to drive the vehicle to reciprocate in the form of vibration.

[0048] When the stroke needs to be adjusted, all the channel opening and closing valves 7 are closed to close the stroke adjustment channels 8 of all the gears, and the corresponding stroke adjustment channel 8 is adjusted and opened according to the selected suitable stroke height.

[0049] The above merely is a preferred specific implementation manner of the present application; however, the protection scope of the present application is not limited thereto. Any person skilled in the art, within the technical range disclosed by the present application, according to the technical scheme and improvement concept of the present application, makes equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. An adjustable driving device for vehicle maintenance, comprising a cylinder body (1), a piston body (2) and a piston rod (3), the piston body (2) is coaxially connected with the piston rod (3), the piston body (2) is slidably arranged in the cylinder body (1) and separates the inner cavity of the cylinder body (1) into an upper cavity (4) and a lower cavity (5), characterized in that, Also comprising: a stroke adjustment mechanism, which comprises an airflow main passage (6), a passage opening and closing valve (7), and a plurality of stroke adjustment passages (8), each of the stroke adjustment passages (8) is in communication with the inner cavity of the cylinder body (1) and is arranged along the sliding direction of the piston body (2), and the passage opening and closing valve (7) is used to control the communication between any one of the stroke adjustment passages (8) and the airflow main passage (6); an air inlet and outlet switching mechanism, which comprises an air inlet passage (9), an air outlet passage (10), and an air pressure elastic switching assembly, the air inlet passage (9) is used for the input of compressed air, the air outlet passage (10) is used for the output of compressed air, the cylinder body (1) is provided with an air source passage (11) in communication with the lower cavity (5), the air pressure elastic switching assembly is used to control the switching of the air source passage (11) in communication with the air inlet passage (9) or the air outlet passage (10), and the airflow main passage (6) is in communication with the air pressure elastic switching assembly to link the air inlet and outlet switching operation of the air pressure elastic switching assembly; and a descending terminal point pressure relief mechanism, which comprises a positioning piece (12), a pressure relief piece (13), and a pressure relief rod (14), the positioning piece (12) is arranged on the piston rod (3), the pressure relief piece (13) is provided with a pressure relief passage (15) and a pressure relief port (16), the pressure relief passage (15) is in communication with the airflow main passage (6), and the pressure relief rod (14) is used for the opening and closing operation of the pressure relief passage (15) and the pressure relief port (16), when the positioning piece (12) abuts against the pressure relief rod (14), the pressure relief rod (14) retreats and the pressure relief passage (15) is in communication with the pressure relief port (16).

2. The adjustable drive apparatus for vehicle inspection according to claim 1, characterized by The air inlet and outlet switching mechanism further comprises a shaped base, and the air inlet passage (9), the air outlet passage (10), and the air pressure elastic switching assembly are arranged in the shaped base; The air pressure elastic switching assembly comprises an elastic piece, a switching valve core (17), an air pressure cavity (18), and a sliding switching type cavity (19), the air pressure cavity (18) and the sliding switching type cavity (19) are arranged in the shaped base and are sealed and separated by the end of the switching valve core (17), the switching valve core (17) is slidingly installed in the sliding switching type cavity (19) to control the communication between the air inlet passage (9) or the air outlet passage (10) and the air source passage (11), the air pressure cavity (18) is in communication with the airflow main passage (6), and the elastic piece is used for the elastic return of the switching valve core (17).

3. The adjustable drive apparatus for vehicle servicing according to claim 2, wherein The elastic piece and the air pressure cavity (18) are arranged at the two axial ends of the switching valve core (17), and the elastic piece is arranged as a compression spring, when the air outlet passage (10) is in the air outlet state, the compression spring is in the elastic compression state.

4. The adjustable drive apparatus for vehicle inspection according to claim 2, wherein The elastic member and the air pressure cavity (18) are arranged on the same side of the switching valve core (17), and the elastic member is arranged as a tension spring, which is in an elastic tension state when the exhaust passage (10) is in an exhaust state.

5. An adjustable drive unit for a vehicle service according to any one of claims 3 or 4, characterized in that The switching valve core (17) is provided with a mounting groove (20) for mounting the elastic member.

6. The adjustable drive apparatus for vehicle servicing according to claim 2, wherein The sliding switching cavity (19) comprises a first cavity (191), a second cavity (192) and a third cavity (193) arranged in sequence, the first cavity (191) is communicated with the exhaust passage (10), the second cavity (192) is communicated with the air source passage (11), and the third cavity (193) is communicated with the air inlet passage (9); the switching valve core (17) comprises a valve stem (171), a first sealing part (172), a second sealing part (173) and a third sealing part (174) arranged coaxially, the first sealing part (172) is used to separate the first cavity (191) and the air pressure cavity (18), the second sealing part (173) is used to separate the first cavity (191) and the second cavity (192), and the third sealing part (174) is used to separate the second cavity (192) and the third cavity (193), and the second cavity (192) is communicated with any one of the first cavity (191) and the third cavity (193).

7. The adjustable drive apparatus for vehicle servicing according to claim 2, wherein The forming base comprises a forming body (21), a first side plate (22) and a second side plate (23), the air inlet passage (9), the exhaust passage (10), the air source passage (11) and the sliding switching cavity (19) are all arranged in the forming body (21), and the first side plate (22) and the second side plate (23) are arranged on the two sides of the forming body (21) to seal the two ends of the sliding switching cavity (19), wherein the air pressure cavity (18) is arranged in the first side plate (22).

8. The adjustable drive apparatus for vehicle servicing of claim 7, wherein, The first side plate (22) is provided with a sliding groove (24), and an air pressure top plate (25) is sealingly arranged in the sliding groove (24), and the air pressure cavity (18) and the switching valve core (17) are arranged on the two sides of the air pressure top plate (25).

9. The adjustable drive apparatus for vehicle servicing of claim 2, wherein, The number of the passage opening and closing valve members (7) is consistent with the number of the stroke adjusting passages (8), the stroke adjusting mechanism is arranged on a forming block (26), the air flow main passage (6) and each stroke adjusting passage (8) are formed on the forming block (26), the forming block (26) is further provided with a mounting hole (27) for mounting the passage opening and closing valve member (7), and the mounting hole (27) is coaxially arranged with each stroke adjusting passage (8).

10. The adjustable drive apparatus for vehicle servicing of claim 9, wherein, The forming base and the forming block (26) are sealingly connected through a sealing pipe member (28), and the pressure relief member (13) and the forming block (26) are sealingly connected through an external pipeline.

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