Automobile clutch booster

Abstract

The present application relates to clutch booster technical field, specifically, relate to a kind of automobile clutch booster.Solve the problem that existing technology must be continuously stepped on pedal when clutch shifting, improve the practicability of equipment.The structure includes shell, the side of shell is equipped with oil inlet, the other side of shell is equipped with push rod, oil cavity is equipped in shell inside near oil inlet side, gas cavity is equipped in shell inside near push rod side, first piston is connected between gas cavity and oil cavity, first piston is fixedly connected with push rod, shell is also equipped with air inlet pipe, air inlet pipe side wall is connected with gas cavity, control structure for controlling when oil cavity oil pressure rises and maintaining the state of gas cavity is transferred, and when oil cavity oil pressure continues to rise and then drops, control stops the control structure for controlling gas cavity gas supply.The present application does not need to be always stepped on clutch when clutch shifting, reduces the driving burden of driver, improves the driving experience of driver, and has strong practicability.

Description

Technical Field

[0001] This invention relates to the field of clutch booster technology, and more specifically, to an automotive clutch booster. Background Technology

[0002] A car clutch booster is an automotive accessory that works on hydraulic or pneumatic principles to reduce the force required by the driver when pressing the clutch pedal, thereby increasing the responsiveness and comfort of the clutch pedal.

[0003] The existing automotive clutch booster works as follows: when the driver depresses the clutch pedal, hydraulic oil activates the piston inside the booster, causing the pneumatic booster to compress gas and pass it through a push rod to separate or engage the clutch disc and flywheel, thus assisting in gear shifting.

[0004] While this method enables power-assisted clutch shifting, it still presents the following problems: Because the clutch disc and flywheel are disengaged by pressing the pedal, and engagement is controlled by releasing the pedal, the pedal must be continuously depressed during each gear shift. Releasing the pedal during this process can lead to shift failure, increasing the driver's workload. Summary of the Invention

[0005] This invention proposes an automotive clutch booster, which solves the problem that in the prior art, the clutch booster requires continuous foot pedal operation during gear shifting, thus improving the practicality of the device.

[0006] The technical solution of the present invention is as follows:

[0007] An automotive clutch booster includes a housing.

[0008] The housing has an oil inlet on one side and a push rod on the other side. An oil chamber is located inside the housing near the oil inlet, and an air chamber is located inside the housing near the push rod. A first piston connects the air chamber and the oil chamber, and the first piston is fixedly connected to the push rod. An air inlet pipe is also provided on the housing. The side wall of the air inlet pipe is connected to the air chamber, and the bottom of the air inlet pipe is connected to the oil chamber. A second piston is located inside the air inlet pipe. The air inlet pipe also has a control structure for maintaining air supply to the air chamber when the oil pressure in the oil chamber rises, and for stopping air supply to the air chamber when the oil pressure in the oil chamber continues to rise and then falls.

[0009] Furthermore, the control structure includes a control component, the intake pipe is provided with a sliding cavity and a control cavity, a sliding hole is connected between the sliding cavity and the control cavity, the second piston is slidably connected to both the sliding cavity and the sliding hole, the control component abuts against the second piston, an adjusting component is slidably connected to the control component, and a limiting component is also slidably connected to the side wall of the control cavity, the limiting component abuts against the adjusting component or the control component.

[0010] Furthermore, the control component includes a first sliding rod, which is slidably connected to the control cavity. A contact plate is fixed to the end of the first sliding rod, and the contact plate abuts against the bottom of the control cavity. The contact plate is provided with a plurality of first air guide holes. The projection surface of each first air guide hole along the central axis of the control cavity falls outside the projection surface of the sliding hole along the central axis of the control cavity. A first limiting plate is provided on the side of the control cavity away from the sliding hole. A plurality of second air guide holes are provided on the first limiting plate. A limiting plate is fixed on the first sliding rod. A first limiting spring is also sleeved on the first sliding rod. The two ends of the first limiting spring are fixedly connected to the limiting plate and the first limiting plate, respectively.

[0011] Furthermore, a first limiting block is fixed on the first sliding rod. The first limiting block has a hemispherical structure. The adjusting member is disposed between the first limiting block and the abutment plate. The adjusting member is slidably connected to the first sliding rod. A first limiting bolt is also provided between the adjusting member and the abutment plate. The first limiting bolt is fixedly connected to the first sliding rod. A second limiting spring is also sleeved on the first sliding rod. The two ends of the second limiting spring are fixedly connected to the first limiting block and the adjusting member, respectively. The adjusting member has a disc-shaped structure. An abutment part is fixed to the end of the adjusting member away from the first sliding rod. The cross-section of the abutment part is an isosceles triangular structure.

[0012] Furthermore, a first sliding groove is provided on the side wall of the control cavity, and a second sliding groove is provided near the control cavity side of the first sliding groove. The cross-sections of the first sliding groove and the second sliding groove are both circular. The cross-sectional diameter of the second sliding groove is smaller than that of the first sliding groove. A second limiting plate is fixed inside the first sliding groove. The limiting member includes a second limiting rod. The second limiting rod is slidably connected to the second limiting plate. A second limiting bolt is provided at the end of the second limiting rod away from the second sliding groove. The second limiting bolt abuts against the second limiting plate.

[0013] Furthermore, a sliding block is fixed on the second limiting rod, the sliding block is slidably connected to the first sliding groove, a third limiting spring is sleeved on the second limiting rod, the two ends of the third limiting spring are fixedly connected to the sliding block and the second limiting plate respectively, a second limiting block is fixed on the side of the second limiting rod near the control cavity, the second limiting block is provided with a limiting inclined surface, the limiting inclined surface abuts against the abutting part.

[0014] Furthermore, the sliding cavity is provided with a third sliding groove on the side near the control cavity and a fourth sliding groove on the side away from the control cavity. The cross-sections of the third and fourth sliding grooves are both circular. The diameter of the cross-section of the third sliding groove is larger than the diameter of the cross-section of the fourth sliding groove. The second piston is slidably connected to both the third and fourth sliding grooves. A fourth limiting spring is sleeved on the second piston. The two sides of the fourth limiting spring are fixedly connected to the third sliding groove and the second piston, respectively.

[0015] Furthermore, the second piston is provided with several sealing grooves, and each sealing groove is fixed with a first sealing rubber, which abuts against the inner wall of the fourth sliding groove.

[0016] Furthermore, the air chamber is provided with a spring groove, and the spring groove is provided with a fifth limiting spring. The first piston includes a piston rod, and a second sealing rubber is fixed to the outside of the piston rod. The second sealing rubber is slidably connected to the oil chamber. A sliding plate is fixed to the end of the piston rod, and the sliding plate is slidably connected to the air chamber. The two ends of the fifth limiting spring are respectively fixedly connected to the spring groove and the sliding plate.

[0017] Furthermore, a protective sleeve is fixed to the outside of the push rod, and the other end of the protective sleeve is fixedly connected to the housing. The protective sleeve is made of rubber material.

[0018] The working principle and beneficial effects of this invention are as follows:

[0019] The working process of this embodiment is as follows: When the foot pedal is in a light pressing state, hydraulic oil enters the oil chamber through the oil inlet. Due to the increase in oil pressure in the oil chamber, the second piston is pushed to move towards the control component. At this time, the control component moves away from the sliding hole. At this time, the limiting component enters between the first limiting block and the adjusting component. At this time, gas enters the air chamber from the air inlet pipe. The air pressure in the air chamber increases and pushes the first piston to extend, causing the clutch disc to disengage from the flywheel, thus realizing clutch shifting. Even if the pedal is released at this time, the limiting component still abuts against the first limiting block, and clutch shifting can continue. When the pedal is pressed down, the limiting component passes through the adjusting component under the action of the limiting inclined surface and the abutment part. At this time, the pedal is released, and under the action of the first limiting spring, the control component moves towards the sliding hole. The adjusting component moves towards the first limiting block under the action of the limiting component. At this time, under the action of the abutment part, the limiting component passes through the adjusting component and the first limiting block. The abutment plate seals the sliding hole, and gas cannot enter the air chamber. As the oil pressure in the oil chamber decreases, the first piston drives the push rod to retract. At this time, the clutch disc and the flywheel are reconnected, and clutch shifting is completed.

[0020] This invention features an oil inlet, a push rod, and an air intake pipe on the housing. A control structure ensures that the push rod extends while the oil pressure in the oil chamber rises and then decreases. When the oil pressure continues to rise and then falls, the control stops supplying air to the air chamber, causing the push rod to retract. This invention replaces the existing design that directly uses oil pressure to control the air intake pipe. Even if the oil pressure drops after the push rod extends due to hydraulic pressure, the control structure ensures that the push rod remains extended. Only when the oil pressure rises and then falls can the push rod retract. This invention eliminates the need to constantly depress the clutch during gear shifting, reducing the driver's workload and improving the driving experience, making it highly practical. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the existing technology;

[0023] Figure 2 This is a schematic diagram of the overall structure of this embodiment;

[0024] Figure 3 This is a schematic diagram of the control cavity structure in this embodiment. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the structure of the second piston in this embodiment;

[0026] Figure 5 This is a schematic diagram of the control cavity structure in this embodiment. Figure 2 ;

[0027] Figure 6 This is a schematic diagram of the connection structure of the push rod in this embodiment.

[0028] In the picture:

[0029] 1. Housing; 11. Oil chamber; 12. Air chamber; 121. Spring groove; 122. Fifth limiting spring; 2. Inlet pipe; 21. Sliding chamber; 211. Fourth sliding groove; 212. Third sliding groove; 22. Control chamber; 221. Sliding hole; 23. First sliding groove; 24. Second sliding groove; 3. First piston; 31. Push rod; 32. Protective sleeve; 33. Sliding plate; 34. Second sealing rubber; 35. Piston rod; 4. Second piston; 41. Sealing groove; 411. First sealing rubber; 42. Fourth limiting spring; 5. Control Components; 51. Abutment plate; 511. First air guide hole; 52. First sliding rod; 521. Second limiting spring; 53. First limiting block; 54. First limiting plate; 541. First limiting spring; 55. Limiting plate; 551. Second air guide hole; 56. First limiting bolt; 6. Limiting component; 61. Second limiting rod; 62. Sliding block; 63. Second limiting plate; 64. Second limiting bolt; 65. Second limiting block; 651. Limiting inclined surface; 66. Third limiting spring; 7. Adjusting component; 71. Abutment part; 8. Oil inlet. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 2-6 As shown, this embodiment proposes an automotive clutch booster, whose structure includes a housing 1. In this embodiment, an oil inlet 8 is located on one side of the housing 1, a push rod 31 is located on the other side of the housing 1, an oil chamber 11 is located inside the housing 1 near the oil inlet 8, and an air chamber 12 is located inside the housing 1 near the push rod 31. A first piston 3 is connected between the air chamber 12 and the oil chamber 11, and the first piston 3 can be used to isolate the oil chamber 11 and the air chamber 12. The first piston 3 is fixedly connected to the push rod 31, and an air intake pipe 2 is located on the housing 1. The side wall of the air intake pipe 2 is connected to the air chamber 12, used to guide the gas from the air intake pipe 2 into the air chamber 12. The bottom of the air intake pipe 2 is connected to the oil chamber 11, used to push the second piston 4 to move when the oil pressure increases. The second piston 4 is located inside the air intake pipe 2, used to isolate the control chamber 22 and the oil chamber 11, preventing hydraulic oil from entering the control chamber 22. The control structure is installed inside the air intake pipe 2 to control the air supply to the air chamber 12 when the oil pressure in the oil chamber 11 rises, and to stop supplying air to the air chamber 12 when the oil pressure in the oil chamber 11 continues to rise and then falls.

[0032] The control structure in this embodiment includes a control component 5, a sliding cavity 21 and a control cavity 22 disposed within the intake pipe 2, and a sliding hole 221 connected between the sliding cavity 21 and the control cavity 22 to guide gas from the control cavity 22 into the sliding cavity 21. The sliding cavity 21 and the sliding hole 221 are simultaneously slidably connected to the second piston 4, the control component 5 abuts against the second piston 4, an adjusting component 7 is slidably disposed on the control component 5, and a limiting component 6 is slidably disposed on the side wall of the control cavity 22, abutting against the adjusting component 7 or the control component 5. This design allows for control of the movement of the first piston 3 by increasing the oil pressure within the oil chamber 11, making the control of the first piston 3's movement less strenuous.

[0033] In this embodiment, the control component 5 includes a first sliding rod 52, which is slidably connected to the control cavity 22. A contact plate 51 is fixedly disposed at the end of the first sliding rod 52 and abuts against the bottom of the control cavity 22. A plurality of first air guide holes 511 are disposed on the contact plate 51 to facilitate the introduction of gas into the gas chamber 12. The projection plane of each first air guide hole 511 along the central axis of the control cavity 22 falls outside the projection plane of the sliding hole 221 along the central axis of the control cavity 22, to facilitate the introduction of gas into the gas chamber 12. A first limiting plate 54 is disposed on the side of the control cavity 22 away from the sliding hole 221. A plurality of second air guide holes 551 are disposed on the first limiting plate 54 to introduce gas. A limiting plate 55 is fixedly disposed on the first sliding rod 52, and a first limiting spring 541 is sleeved on the first sliding rod 52. The limiting plate 55 and the first limiting plate 54 are simultaneously fixedly connected to both ends of the first limiting spring 541. In this embodiment, the first limiting spring 541 ensures that the limiting plate 55 automatically abuts against the sliding hole 221 without external force, preventing gas from flowing into the air chamber 12. This embodiment may have a gap between the sliding hole 221 and the second piston 4. When the second piston 4 pushes the control member 5 away from the sliding hole 221, the gas from the intake pipe 2 passes through the first air guide hole 511, the sliding hole 221, and the sliding chamber 21, then enters the air chamber 12, assisting the first piston 3 in pushing outwards. However, when the control member 5 abuts against the sliding hole 221, the sliding hole 221 is sealed by the control member 5, preventing gas from flowing into the air chamber 12.

[0034] In this embodiment, an air outlet valve can also be provided on the side of the air chamber 12 away from the push rod 31. By setting a preset air pressure value, when the air pressure in the air chamber 12 reaches a value greater than the preset air pressure value, the air outlet valve will open, which will make it easier for the push rod 31 to return to its original position when the oil pressure in the oil chamber 11 drops.

[0035] In this embodiment, the first limiting block 53 is fixedly mounted on the first sliding rod 52, and the first limiting block 53 has a hemispherical structure. This design allows the limiting block to pass smoothly through the first limiting block 53 when it contacts the arc-shaped surface of the first limiting block 53, but when it contacts the flat surface of the first limiting block 53, it is limited by the flat surface and cannot move forward. An adjusting member 7 is provided between the first limiting block 53 and the abutment plate 51. The adjusting member 7 is slidably connected to the first sliding rod 52. A first limiting bolt 56 is provided between the adjusting member 7 and the abutment plate 51, and the first limiting bolt 56 is fixedly connected to the first sliding rod 52. A second limiting spring 521 is sleeved on the first sliding rod 52. The two ends of the second limiting spring 521 are fixedly connected to the first limiting block 53 and the adjusting member 7, respectively, to ensure that the adjusting member 7 remains away from the abutment plate 51, so that the limiting block can enter between the first limiting block 53 and the adjusting member 7 without external force. The adjusting member 7 has a disc-shaped structure, and the abutment portion 71 is fixedly disposed at the end of the adjusting member 7 away from the first sliding rod 52. The cross-section of the abutment portion 71 is an isosceles triangle. In this embodiment, the abutment portion 71 adopts an isosceles triangle cross-section, so that both sides of the abutment portion 71 are provided with sliding inclined surfaces. When the limiting block contacts the abutment portion 71, under the influence of the sliding inclined surfaces, the limiting block can retract and pass through the abutment portion 71. When the limiting block passes through the first limiting block 53, its retraction will drive the adjusting member 7 closer to the abutment disc 51. At this time, the first limiting block 53 can pass through the abutment portion 71 and the adjusting member 7.

[0036] In this embodiment, the first sliding groove 23 is disposed on the side wall of the control cavity 22, and the second sliding groove 24 is disposed on the side of the first sliding groove 23 near the control cavity 22. Both the first sliding groove 23 and the second sliding groove 24 have circular cross-sections, with the diameter of the second sliding groove 24 being smaller than that of the first sliding groove 23. This is to prevent the limiting block from extending too far into the control cavity 22, which could cause the limiting block to jam the control component 5 and affect its normal operation. The second limiting plate 63 is fixedly disposed within the first sliding groove 23. The limiting component 6 includes a second limiting rod 61, which is slidably connected to the second limiting plate 63. A second limiting bolt 64 is disposed at the end of the second limiting rod 61 away from the second sliding groove 24, and abuts against the second limiting plate 63 to prevent the limiting block from extending too far into the control cavity 22. In this embodiment, the movement of the control component 5 can be controlled by controlling the displacement of the limiting block.

[0037] In this embodiment, the sliding block 62 is fixedly mounted on the second limiting rod 61, and the sliding block 62 is slidably connected to the first sliding groove 23. The third limiting spring 66 is sleeved on the second limiting rod 61 to ensure that the limiting block is always in the extended state under the action of the third limiting spring 66, ensuring that the limiting block is in contact with the control component 5 or the adjusting component 7. The two ends of the third limiting spring 66 are fixedly connected to the sliding block 62 and the second limiting plate 63, respectively. The second limiting block 65 is fixedly mounted on the side of the second limiting rod 61 near the control cavity 22. The limiting inclined surface 651 is mounted on the second limiting block 65 and abuts against the abutting part 71. The second limiting block 65 used in this embodiment adopts a right-angled trapezoidal structure. When the right-angled side of the second limiting block 65 contacts the arc-shaped surface on the first limiting block 53, the second limiting block 65 generates a force away from the control cavity 22, so that the second limiting block 65 can retract, making it convenient for the first limiting block to pass through. When the straight edge of the second limiting block 65 comes into contact with the straight edge of the first limiting block 53, the force that prevents the second limiting block 65 from moving away from the control cavity 22 is insufficient. At this time, under the action of the limiting member 6, the control member 5 cannot continue to move.

[0038] In this embodiment, the third sliding groove 212 is located on the side of the sliding cavity 21 near the control cavity 22, and the fourth sliding groove 211 is located on the side of the sliding cavity 21 away from the control cavity 22. Both the third and fourth sliding grooves 212 and 211 have circular cross-sections, with the diameter of the third sliding groove 212 being larger than that of the fourth sliding groove 211, to prevent the second piston 4 from disengaging from the sliding cavity 21. The second piston 4 is slidably connected to both the third and fourth sliding grooves 212 and 211. A fourth limiting spring 42 is sleeved on the second piston 4, with its two sides fixedly connected to the third sliding groove 212 and the second piston 4, respectively. The design of the fourth limiting spring 42 in this embodiment ensures that when the oil pressure in the oil chamber 11 decreases, the second piston 4 can move away from the control cavity 22 under the action of the fourth limiting spring 42, helping to close the intake pipe 2 and supply air to the air chamber 12.

[0039] In this embodiment, several sealing grooves 41 are provided on the second piston 4, and a first sealing rubber 411 is fixedly provided on each sealing groove 41, with the first sealing rubber 411 abutting against the inner wall of the fourth sliding groove 211. This design of the first sealing rubber 411 isolates the gas in the oil chamber 11 and the control chamber 22, preventing hydraulic oil from overflowing into the control chamber 22 and affecting subsequent control of the clutch.

[0040] In this embodiment, the air chamber 12 is provided with a spring groove 121, and the fifth limiting spring 122 is disposed in the spring groove 121 to reset after shifting. The first piston 3 includes a piston rod 35, which is slidably connected to the oil chamber 11. A sliding plate 33 is fixedly disposed at the end of the piston rod 35 and is slidably connected to the air chamber 12. The two ends of the fifth limiting spring 122 are fixedly connected to the spring groove 121 and the sliding plate 33, respectively. A second sealing rubber 34 is fixedly fixed to the outside of the piston rod 35 and is slidably connected to the oil chamber 11. This design allows the piston rod 35 to automatically reset via the fifth limiting spring 122 after the air supply to the air chamber 12 is stopped.

[0041] In this embodiment, the protective sleeve 32 is fixedly installed outside the push rod 31, and the other end of the protective sleeve 32 is fixedly connected to the housing 1. The protective sleeve 32 is made of rubber material. The protective sleeve 32 can prevent dust, dirt and moisture from entering the interior, protect the push rod 31 and other components, and extend their service life. In addition, the rubber material has good flexibility and wear resistance, can absorb vibration and reduce noise, thereby improving overall performance and driving experience.

[0042] The working process of this embodiment is as follows: When the foot pedal is in a light pressing state, hydraulic oil enters the oil chamber 11 through the oil inlet 8. Due to the increase in oil pressure in the oil chamber 11, the second piston 4 is pushed to move towards the control component 5. At this time, the control component 5 moves away from the sliding hole 221. At this time, the limiting component 6 enters between the first limiting block 53 and the adjusting component 7. At this time, gas enters the air chamber 12 from the air inlet pipe 2. The air pressure in the air chamber 12 increases and pushes the first piston 3 to extend, causing the clutch disc to disengage from the flywheel, thus realizing clutch shifting. Even when the pedal is released, the limiting member 6 remains in contact with the first limiting block 53, allowing for continued clutch shifting. When the pedal is depressed, the limiting member 6, under the action of the limiting inclined surface 651 and the abutment part 71, passes through the adjusting member 7. Releasing the pedal causes the control member 5 to move towards the sliding hole 221 under the action of the first limiting spring 541. The adjusting member 7, driven by the limiting member 6, moves towards the first limiting block 53. At this point, under the action of the abutment part 71, the limiting member 6 passes through the adjusting member 7 and the first limiting block 53. The abutment plate 51 seals the sliding hole 221, preventing gas from entering the air chamber 12. As the oil pressure in the oil chamber 11 decreases, the first piston 3 retracts the push rod 31, reconnecting the clutch disc to the flywheel and completing the clutch shift. This makes shifting easier.

[0043] In this embodiment, gear shifting can also be achieved by pressing the pedal firmly, but the pedal should be released after the shift is complete. This makes gear shifting more convenient and faster.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automobile clutch booster, comprising a housing (1), characterized in that, one side of the housing (1) is provided with an oil inlet (8), the other side of the housing (1) is provided with a push rod (31), the housing (1) is provided with an oil cavity (11) near the oil inlet (8), the housing (1) is provided with an air cavity (12) near the push rod (31), the air cavity (12) and the oil cavity (11) are connected by a first piston (3), the first piston (3) is fixedly connected with the push rod (31), the housing (1) is further provided with an air inlet pipe (2), the side wall of the air inlet pipe (2) is connected with the air cavity (12), the bottom of the air inlet pipe (2) is connected with the oil cavity (11), the air inlet pipe (2) is provided with a second piston (4), and the air inlet pipe (2) is provided with a control structure for controlling the state of air supply to the air cavity (12) when the oil pressure of the oil cavity (11) rises, and for controlling the stop of air supply to the air cavity (12) when the oil pressure of the oil cavity (11) continues to rise and then falls; the control structure comprises a control piece (5), the air inlet pipe (2) is provided with a sliding cavity (21) and a control cavity (22), the sliding cavity (21) and the control cavity (22) are connected by a sliding hole (221), the second piston (4) is slidably connected with the sliding cavity (21) and the sliding hole (221), the control piece (5) abuts against the second piston (4), the control piece (5) is slidably connected with an adjusting piece (7), and the side wall of the control cavity (22) is further provided with a limiting piece (6) in sliding connection, the limiting piece (6) abuts against the adjusting piece (7) or the control piece (5).

2. The power booster for automotive clutch according to claim 1, wherein the control piece (5) comprises a first sliding rod (52), the first sliding rod (52) is slidably connected with the control cavity (22), the end of the first sliding rod (52) is fixedly provided with an abutting disc (51), the abutting disc (51) abuts against the bottom of the control cavity (22), the abutting disc (51) is provided with a plurality of first air guide holes (511), the projection of each first air guide hole (511) on the center axis direction of the control cavity (22) falls outside the projection of the sliding hole (221) on the center axis direction of the control cavity (22), the control cavity (22) is provided with a first limiting plate (54) away from the sliding hole (221), the first limiting plate (54) is provided with a plurality of second air guide holes (551), the first sliding rod (52) is fixedly provided with a limiting disc (55), and the first sliding rod (52) is further sleeved with a first limiting spring (541), and the two ends of the first limiting spring (541) are fixedly connected with the limiting disc (55) and the first limiting plate (54) respectively.

3. The automobile clutch booster according to claim 2, wherein The first sliding rod (52) is further fixed with a first limiting block (53), the first limiting block (53) is a hemispherical structure, the adjusting part (7) is arranged between the first limiting block (53) and the abutting disc (51), the adjusting part (7) is in sliding connection with the first sliding rod (52), the first limiting bolt (56) is further arranged between the adjusting part (7) and the abutting disc (51), the first limiting bolt (56) is fixedly connected with the first sliding rod (52), the first sliding rod (52) is further sleeved with a second limiting spring (521), the two ends of the second limiting spring (521) are fixedly connected with the first limiting block (53) and the adjusting part (7) respectively, the adjusting part (7) is a disc structure, the adjusting part (7) is fixedly provided with an abutting portion (71) away from the first sliding rod (52), the abutting portion (71) is an isosceles triangular structure in cross section.

4. The power booster for automotive clutch according to claim 3, wherein The control cavity (22) is further provided with a first sliding groove (23) on the side wall, the first sliding groove (23) is provided with a second sliding groove (24) close to the side of the control cavity (22), the cross sections of the first sliding groove (23) and the second sliding groove (24) are circular structures, the cross section diameter of the second sliding groove (24) is smaller than that of the first sliding groove (23), the first sliding groove (23) is fixedly provided with a second limiting plate (63), the limiting part (6) comprises a second limiting rod (61), the second limiting rod (61) is in sliding connection with the second limiting plate (63), the second limiting rod (61) is provided with a second limiting bolt (64) away from the second sliding groove (24), and the second limiting bolt (64) abuts against the second limiting plate (63).

5. The automobile clutch booster according to claim 4, wherein The second limiting rod (61) is further fixedly provided with a sliding block (62), the sliding block (62) is in sliding connection with the first sliding groove (23), the second limiting rod (61) is sleeved with a third limiting spring (66), the two ends of the third limiting spring (66) are fixedly connected with the sliding block (62) and the second limiting plate (63) respectively, the second limiting rod (61) is fixedly provided with a second limiting block (65) close to the side of the control cavity (22), the second limiting block (65) is provided with a limiting inclined surface (651), and the limiting inclined surface (651) abuts against the abutting portion (71).

6. The power booster for automotive clutch according to claim 1, wherein The sliding cavity (21) is provided with a third sliding groove (212) close to the side of the control cavity (22), and is provided with a fourth sliding groove (211) away from the side of the control cavity (22), the cross sections of the third sliding groove (212) and the fourth sliding groove (211) are circular structures, the diameter of the cross section of the third sliding groove (212) is greater than that of the fourth sliding groove (211), and the second piston (4) is in sliding connection with the third sliding groove (212) and the fourth sliding groove (211) simultaneously, the second piston (4) is sleeved with a fourth limiting spring (42), and the two sides of the fourth limiting spring (42) are fixedly connected with the third sliding groove (212) and the second piston (4) respectively.

7. A clutch booster for a vehicle according to claim 6, wherein The second piston (4) is provided with a plurality of sealing grooves (41), and each of the sealing grooves (41) is fixed with a first sealing rubber (411) which is in abutment with the inner wall of the fourth sliding groove (211).

8. The power booster for automotive clutch according to claim 1, wherein The air cavity (12) is provided with a spring groove (121), the spring groove (121) is provided with a fifth limiting spring (122), the first piston (3) comprises a piston rod (35), the piston rod (35) is fixedly provided with a second sealing rubber (34), the second sealing rubber (34) is in sliding connection with the oil cavity (11), the end of the piston rod (35) is fixedly provided with a sliding plate (33), the sliding plate (33) is in sliding connection with the air cavity (12), and the two ends of the fifth limiting spring (122) are fixedly connected with the spring groove (121) and the sliding plate (33) respectively.

9. The power booster for automotive clutch according to claim 1, wherein The push rod (31) is further fixedly provided with a protective sleeve (32), one end of the protective sleeve (32) is fixedly connected with the shell (1), and the protective sleeve (32) is composed of rubber material.

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