Automobile clutch booster

Abstract

The invention relates to the technical field of clutch boosters, in particular to an automobile clutch booster. The problem that in the prior art, when clutch gear shifting is conducted on a booster, a pedal must be continuously stepped on is solved, and the practicability of equipment is improved. An oil inlet is formed in one side of the shell, a push rod is arranged on the other side of the shell, an oil cavity is formed in the side, close to the oil inlet, in the shell, an air cavity is formed in the side, close to the push rod, in the shell, a first piston is connected between the air cavity and the oil cavity, the first piston is fixedly connected with the push rod, an air inlet pipe is further arranged on the shell, and the side wall of the air inlet pipe is connected with the air cavity. And a control structure is arranged in the air inlet pipe, and is used for controlling the gas transmission state of the gas cavity after the oil pressure of the oil cavity is increased and controlling the gas transmission to the gas cavity to be stopped when the oil pressure of the oil cavity is continuously increased and then reduced. When clutch gear shifting is carried out, the clutch does not need to be treaded by a foot all the time, the driving burden of a driver is relieved, the driving experience of the driver is improved, and high practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of clutch boosters, and more specifically, to an automotive clutch booster. Background Art

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

[0003] The operation of the existing automotive clutch booster is as follows: When the driver steps on the clutch pedal, the internal piston of the booster is activated by hydraulic oil, causing the pneumatic booster to compress gas and separate or engage the clutch disc and the flywheel through a push rod to assist in shifting gears.

[0004] Although this can assist in automotive clutch shifting, there are still the following problems: Since the separation of the clutch disc and the flywheel is controlled by stepping on the pedal, and the combination is controlled by releasing the pedal. Therefore, every time a clutch shift is performed, the driver must continuously step on the pedal. If the pedal is released during this process, it may cause a shifting failure, increasing the driver's driving burden. Summary of the Invention

[0005] The present invention provides an automotive clutch booster, which solves the problem that the pedal must be continuously stepped on during clutch shifting in the prior art, and improves the practicality of the device.

[0006] The technical solution of the present invention is as follows: An automotive clutch booster includes a housing. An oil inlet is provided on one side of the housing, a push rod is provided on the other side of the housing, an oil chamber is provided near the oil inlet side inside the housing, a gas chamber is provided near the push rod side inside the housing, a first piston is connected between the gas chamber and the oil chamber, the first piston is fixedly connected to the push rod, an air inlet pipe is further provided on the housing, the side wall of the air inlet pipe is connected to the gas chamber, the bottom of the air inlet pipe is connected to the oil chamber, a second piston is provided inside the air inlet pipe, and a control structure is provided inside the air inlet pipe for controlling the state of continuously supplying gas to the gas chamber when the oil pressure in the oil chamber rises, and for controlling the stop of supplying gas to the gas chamber when the oil pressure in the oil chamber continues to rise and then drops.

[0007] Further, the control structure includes a control member. A sliding chamber and a control chamber are provided inside the air inlet pipe. A sliding hole is connected between the sliding chamber and the control chamber. The second piston is simultaneously slidably connected to the sliding chamber and the sliding hole. The control member abuts against the second piston. An adjusting member is slidably connected to the control member. A limiting member is further slidably connected to the side wall of the control chamber. The limiting member abuts against the adjusting member or the control member.

[0008] Further, the control member includes a first sliding rod, which is slidably connected to the control cavity. An abutting disc is fixed to the end of the first sliding rod, and the abutting disc abuts against the bottom of the control cavity. A plurality of first air guide holes are provided on the abutting disc, and the projection planes of the first air guide holes along the central axis direction of the control cavity fall outside the projection plane of the sliding hole along the central axis direction of the control cavity. A first limiting plate is provided on the side of the control cavity away from the sliding hole, and a plurality of second air guide holes are provided on the first limiting plate. A limiting disc is fixed to the first sliding rod, and a first limiting spring is further sleeved on the first sliding rod. Two ends of the first limiting spring are respectively fixedly connected to the limiting disc and the first limiting plate.

[0009] Further, a first limiting block is also fixed to the first sliding rod. The first limiting block has a hemispherical structure. The adjusting member is arranged between the first limiting block and the abutting disc. The adjusting member is slidably connected to the first sliding rod. A first limiting bolt is further provided between the adjusting member and the abutting disc. The first limiting bolt is fixedly connected to the first sliding rod. A second limiting spring is further sleeved on the first sliding rod. Two ends of the second limiting spring are respectively fixedly connected to the first limiting block and the adjusting member. The adjusting member has a disc-shaped structure, and an abutting portion is fixed to the end of the adjusting member away from the first sliding rod. The cross-section of the abutting portion is an isosceles triangle structure.

[0010] Further, a first sliding groove is also provided on the side wall of the control cavity. A second sliding groove is provided on the side of the first sliding groove close to the control cavity. The cross-sections of the first sliding groove and the second sliding groove are both circular structures. The cross-sectional diameter of the second sliding groove is smaller than the cross-sectional diameter of the first sliding groove. A second limiting plate is fixed in the first sliding groove. The limiting member includes a second limiting rod, which 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, and the second limiting bolt abuts against the second limiting plate.

[0011] Further, a sliding block is also fixed to 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. Two ends of the third limiting spring are respectively fixedly connected to the sliding block and the second limiting plate. A second limiting block is fixed to the side of the second limiting rod close to the control cavity, and a limiting inclined surface is provided on the second limiting block. The limiting inclined surface abuts against the abutting portion.

[0012] Further, a third sliding groove is provided on the side of the sliding cavity close to the control cavity, and a fourth sliding groove is provided on the side of the sliding cavity away from the control cavity. The cross-sections of the third sliding groove and the fourth sliding groove are both circular structures. The diameter of the cross-section of the third sliding groove is larger than that of the cross-section of the fourth sliding groove. The second piston is slidably connected to both the third sliding groove and the fourth sliding groove at the same time. A fourth limiting spring is sleeved on the second piston, and both sides of the fourth limiting spring are fixedly connected to the third sliding groove and the second piston respectively.

[0013] Further, a plurality of sealing grooves are provided on the second piston, and a first sealing rubber is fixed on each of the sealing grooves. The first sealing rubber abuts against the inner wall of the fourth sliding groove.

[0014] Further, a spring groove is provided in the air cavity, and a fifth limiting spring is provided in the spring groove. The first piston includes a piston rod, and a second sealing rubber is fixed outside the piston rod. The second sealing rubber is slidably connected to the oil cavity. A sliding plate is fixed at the end of the piston rod, and the sliding plate is slidably connected to the air cavity. Both ends of the fifth limiting spring are fixedly connected to the spring groove and the sliding plate respectively.

[0015] Further, a protective sleeve is also fixed outside 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.

[0016] The working principle and beneficial effects of the present invention are as follows: The working process of this embodiment: When the foot pedal is in a lightly pressed state, the hydraulic oil enters the oil cavity through the oil inlet. Since the oil pressure in the oil cavity increases, the second piston is pushed towards the control member. At this time, the control member moves away from the sliding hole. At this time, the limiting member enters between the first limiting block and the adjusting member. At this time, the gas enters the air cavity from the intake pipe, and the increased air pressure in the air cavity pushes the first piston to extend and move, driving the clutch disc to disengage from the flywheel, and clutch shifting can be achieved. Even if the foot pedal is released at this time, the limiting member still abuts against the first limiting block, and clutch shifting can still continue; when the foot pedal continues to be pressed down, the limiting member passes through the adjusting member under the action of the limiting inclined surface and the abutting portion. At this time, the foot pedal is released, and under the action of the first limiting spring, the control member moves towards the sliding hole direction, and the adjusting member moves towards the first limiting block under the drive of the limiting member. At this time, under the action of the abutting portion, the limiting member passes through the adjusting member and the first limiting block, and the abutting disc seals the sliding hole, and the gas cannot enter the air cavity. As the oil pressure in the oil cavity decreases, the first piston drives the push rod to retract, and at this time, the clutch disc is reconnected to the flywheel to complete clutch shifting.

[0017] The present invention provides an oil inlet, a push rod, and an air inlet pipe on the housing. Through a control structure, it ensures that after the oil pressure in the oil chamber rises, the air chamber is in an air supply state to ensure the extension of the push rod. When the oil pressure in the oil chamber continues to rise and then drops, the control stops supplying air to the air chamber, causing the push rod to retract. The present invention replaces the prior art design that directly uses oil pressure to control whether the air inlet pipe admits air. After the push rod is extended by oil pressure, even if the oil pressure drops, the control structure can ensure that the push rod remains in the extended state. Only when the oil pressure continues to rise and then drops can the push rod retract. When performing clutch shifting, the present invention does not require the driver to keep stepping on the clutch all the time, reducing the driver's driving burden and improving the driver's driving experience, with strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0019] Figure 1 is a schematic structural diagram of the prior art; Figure 2 is a schematic diagram of the overall structure of this embodiment; Figure 3 is a schematic structural diagram of the control chamber in this embodiment Figure 1 ; Figure 4 is a schematic diagram of the structure of the second piston in this embodiment; Figure 5 is a schematic structural diagram of the control chamber in this embodiment Figure 2 ; Figure 6 is a schematic diagram of the connection structure of the push rod in this embodiment.

[0020] In the figure: 1. Housing; 11. Oil chamber; 12. Air chamber; 121. Spring groove; 122. Fifth limit spring; 2. Air 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 limit spring; 5. Control member; 51. Contact disc; 511. First air guide hole; 52. First sliding rod; 521. Second limit spring; 53. First limit block; 54. First limit plate; 541. First limit spring; 55. Limit disc; 551. Second air guide hole; 56. First limit bolt; 6. Limiting member; 61. Second limit rod; 62. Sliding block; 63. Second limit plate; 64. Second limit bolt; 65. Second limit block; 651. Limit inclined surface; 66. Third limit spring; 7. Adjusting member; 71. Contact portion; 8. Oil inlet. Detailed implementation manners

[0021] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0022] As Figures 2 to 6 shown, this embodiment proposes an automotive clutch booster, the structure of which includes a housing 1. The oil inlet 8 in this embodiment is arranged on one side of the housing 1, the push rod 31 is arranged on the other side of the housing 1, the oil chamber 11 is arranged inside the housing 1 near the oil inlet 8 side, the air chamber 12 is arranged inside the housing 1 near the push rod 31 side, the first piston 3 is connected and arranged 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 the air inlet pipe 2 is arranged on the housing 1. The side wall of the air inlet pipe 2 is connected to the air chamber 12 to introduce the gas in the air inlet pipe 2 into the air chamber 12. The bottom of the air inlet pipe 2 is connected to the oil chamber 11 to push the second piston 4 to move when the oil pressure increases. The second piston 4 is arranged inside the air inlet pipe 2 to isolate the control chamber 22 and the oil chamber 11 and prevent the hydraulic oil from entering the control chamber 22. The control structure is arranged inside the air inlet pipe 2 to control to maintain the air supply state to the air chamber 12 when the oil pressure in the oil chamber 11 rises, and to control to stop supplying air to the air chamber 12 when the oil pressure in the oil chamber 11 continues to rise and then drops.

[0023] The control structure in this embodiment includes a control member 5, a sliding chamber 21 and a control chamber 22 are arranged inside the air inlet pipe 2, a sliding hole 221 is connected and arranged between the sliding chamber 21 and the control chamber 22 to introduce the gas from the control chamber 22 into the sliding chamber 21. The sliding chamber 21 and the sliding hole 221 are both slidably connected to the second piston 4, the control member 5 abuts against the second piston 4, the adjusting member 7 is slidably arranged on the control member 5, the limiting member 6 is slidably arranged on the side wall of the control chamber 22, and the limiting member 6 abuts against the adjusting member 7 or the control member 5. Such a design enables the movement of the first piston 3 to be controlled by increasing the oil pressure in the oil chamber 11, making it more labor-saving to control the movement of the first piston 3.

[0024] The control member 5 in this embodiment includes a first sliding rod 52. The first sliding rod 52 is slidably connected to the control cavity 22. The abutting disc 51 is fixedly arranged at the end of the first sliding rod 52, and the abutting disc 51 abuts against the bottom of the control cavity 22. A number of first air guide holes 511 are arranged on the abutting disc 51 to facilitate the introduction of gas into the air cavity 12. The projection plane of each first air guide hole 511 along the central axis direction of the control cavity 22 falls outside the projection plane of the sliding hole 221 along the central axis direction of the control cavity 22 to facilitate the introduction of gas into the air cavity 12. The first limiting plate 54 is arranged on the side of the control cavity 22 away from the sliding hole 221. A number of second air guide holes 551 are arranged on the first limiting plate 54 to introduce gas. The limiting disc 55 is fixedly arranged on the first sliding rod 52. The first limiting spring 541 is sleeved on the first sliding rod 52, and both the limiting disc 55 and the first limiting plate 54 are fixedly connected to both ends of the first limiting spring 541. In this embodiment, the first limiting spring 541 enables the limiting disc 55 to automatically abut against the sliding hole 221 without being affected by other external forces, ensuring that gas does not flow into the air cavity 12. In this embodiment, a gap can be provided 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 in the intake pipe 2 passes through the first air guide hole 511, the sliding hole 221, and the sliding cavity 21, and then enters the air cavity 12 to help the first piston 3 to eject. When the control member 5 abuts against the sliding hole 221, since the sliding hole 221 is sealed by the control member 5, gas cannot flow into the air cavity 12.

[0025] In this embodiment, an air outlet valve can also be provided on the side of the air cavity 12 away from the push rod 31. By presetting the air pressure value for air outlet, when the air pressure in the air cavity 12 is greater than the preset air pressure value, the air outlet valve opens, facilitating the return of the push rod 31 when the oil pressure in the oil cavity 11 drops.

[0026] In this embodiment, the first limiting block 53 is fixedly arranged on the first sliding rod 52, and the first limiting block 53 is of a hemispherical structure. Such a design enables the limiting block to smoothly pass through the first limiting block 53 when the limiting block contacts the arc surface of the first limiting block 53, while when the limiting block contacts the plane on the first limiting block 53, restricted by the plane, the limiting block is blocked and cannot move forward. An adjusting member 7 is arranged between the first limiting block 53 and the abutting disc 51. The adjusting member 7 is slidably connected to the first sliding rod 52. The first limiting bolt 56 is arranged between the adjusting member 7 and the abutting disc 51, and the first limiting bolt 56 is fixedly connected to the first sliding rod 52. The second limiting spring 521 is sleeved on the first sliding rod 52, and the two ends of the second limiting spring 521 are respectively fixedly connected to the first limiting block 53 and the adjusting member 7, so as to ensure that the adjusting member 7 keeps away from the abutting disc 51, enabling the limiting block to enter between the first limiting block 53 and the adjusting member 7 without external force. The adjusting member 7 is of a disc-shaped structure, and the abutting portion 71 is fixedly arranged at the end of the adjusting member 7 away from the first sliding rod 52. The cross-section of the abutting portion 71 is of an isosceles triangle structure. In this embodiment, the cross-section of the adopted abutting portion 71 is of an isosceles triangle structure, so that sliding inclined surfaces are arranged on both sides of the abutting portion 71. When the limiting block contacts the abutting portion 71, under the influence of the sliding inclined surfaces, the limiting block can be received and pass through the abutting portion 71. When the limiting block passes through the first limiting block 53 and then retreats, it will drive the adjusting member 7 to approach the abutting disc 51. At this time, the first limiting block 53 can pass through the first limiting block 53 and the adjusting member 7 through the abutting portion 71.

[0027] In this embodiment, the first sliding groove 23 is arranged on the side wall of the control cavity 22, and the second sliding groove 24 is arranged on the side of the first sliding groove 23 close to the control cavity 22. The cross-sections of the first sliding groove 23 and the second sliding groove 24 are both of circular structures, and the cross-section diameter of the second sliding groove 24 is smaller than that of the first sliding groove 23, so as to prevent the limiting block from penetrating too deeply into the control cavity 22, resulting in the limiting block jamming the control member 5 and affecting the normal operation of the control member 5. The second limiting plate 63 is fixedly arranged in the first sliding groove 23. The limiting member 6 includes a second limiting rod 61. The second limiting rod 61 is slidably connected to the second limiting plate 63. The second limiting bolt 64 is arranged at the end of the second limiting rod 61 away from the second sliding groove 24, and the second limiting bolt 64 abuts against the second limiting plate 63, so as to prevent the limiting block from penetrating too deeply into the control cavity 22. In this embodiment, the movement of the control member 5 can be controlled by controlling the displacement of the limiting block.

[0028] In this embodiment, the sliding block 62 is fixedly arranged on the second limiting rod 61. The sliding block 62 is slidably connected with the first sliding groove 23. The third limiting spring 66 is sleeved on the second limiting rod 61 to ensure that under the action of the third limiting spring 66, the limiting block is always in the extended state, ensuring that the limiting block contacts the control member 5 or the adjusting member 7. The two ends of the third limiting spring 66 are respectively fixedly connected with the sliding block 62 and the second limiting plate 63. The second limiting block 65 is fixedly arranged on the second limiting rod 61 close to the control cavity 22 side. The limiting inclined surface 651 is arranged on the second limiting block 65. The limiting inclined surface 651 abuts against the abutting portion 71. The second limiting block 65 adopted in this embodiment has a right trapezoidal structure. When the right-angle side of the second limiting block 65 contacts the arc surface on the first limiting block 53, the second limiting block 65 generates a force away from the control cavity 22, enabling the second limiting block 65 to contract, facilitating the passing of the first limiting block. When the straight side of the second limiting block 65 abuts against the straight side of the first limiting block 53, the force that can move the second limiting block 65 away from the control cavity 22 does not exist. At this time, under the action of the limiting member 6, the control member 5 cannot move further.

[0029] In this embodiment, the third sliding groove 212 is arranged on the sliding cavity 21 close to the control cavity 22 side, and the fourth sliding groove 211 is arranged on the sliding cavity 21 away from the control cavity 22 side. The cross-sections of both 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 larger than the diameter of the cross-section of the fourth sliding groove 211 to prevent the second piston 4 from detaching from the sliding cavity 21. The second piston 4 is simultaneously slidably connected with the third sliding groove 212 and the fourth sliding groove 211. The fourth limiting spring 42 is sleeved on the second piston 4. The two sides of the fourth limiting spring 42 are respectively fixedly connected with the third sliding groove 212 and the second piston 4. The design of the fourth limiting spring 42 adopted in this embodiment ensures that after the oil pressure in the oil cavity 11 drops, under the action of the fourth limiting spring 42, the second piston 4 can move away from the control cavity 22 to help close the air inlet pipe 2 for supplying air to the air cavity 12.

[0030] In this embodiment, a plurality of sealing grooves 41 are arranged on the second piston 4. The first sealing rubber 411 is fixedly arranged in each sealing groove 41. The first sealing rubber 411 abuts against the inner wall of the fourth sliding groove 211. Such a design of the first sealing rubber 411 isolates the gas in the oil cavity 11 and the control cavity 22, preventing the hydraulic oil from overflowing into the control cavity 22 and affecting the subsequent control of the clutch.

[0031] In the air chamber 12 of this embodiment, a spring groove 121 is provided, and a fifth limiting spring 122 is arranged in the spring groove 121 to reset automatically after the gear shift is completed. The first piston 3 includes a piston rod 35, the piston rod 35 is slidably connected to the oil chamber 11, a sliding plate 33 is fixedly arranged at the end of the piston rod 35, the sliding plate 33 is slidably connected to the air chamber 12, and 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 fixed outside the piston rod 35, and the second sealing rubber 34 is slidably connected to the oil chamber 11. Such a design enables the piston rod 35 to be automatically reset through the fifth limiting spring 122 after the air supply to the air chamber 12 is stopped.

[0032] In this embodiment, the protective sleeve 32 is fixedly arranged outside the push rod 31, the other end of the protective sleeve 32 is fixedly connected to the housing 1, and 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 the service life. In addition, the rubber material has good flexibility and wear resistance, can absorb vibration and reduce noise, thereby improving the overall performance and driving experience.

[0033] The working process of this embodiment: When the foot pedal is in the light step state, the hydraulic oil enters the oil chamber 11 through the oil inlet 8. Since the oil pressure in the oil chamber 11 increases, the second piston 4 is pushed towards the control member 5. At this time, the control member 5 moves away from the sliding hole 221. At this time, the limiting member 6 enters between the first limiting block 53 and the adjusting member 7. At this time, the gas enters the air chamber 12 from the air inlet pipe 2. The increased air pressure in the air chamber 12 pushes the first piston 3 to extend and move, driving the clutch disc away from the flywheel, and the clutch gear shift can be realized. Even if the foot pedal is released at this time, the limiting member 6 still abuts against the first limiting block 53, and the clutch gear shift can still be continued; When the foot pedal continues to be stepped on, the limiting member 6 passes through the adjusting member 7 under the action of the limiting inclined surface 651 and the abutting portion 71. At this time, the foot pedal is released, and under the action of the first limiting spring 541, the control member 5 moves towards the sliding hole 221. The adjusting member 7 moves towards the first limiting block 53 under the drive of the limiting member 6. At this time, under the action of the abutting portion 71, the limiting member 6 passes through the adjusting member 7 and the first limiting block 53, and the abutting disc 51 seals the sliding hole 221, and the gas cannot enter the air chamber 12. As the oil pressure in the oil chamber 11 decreases, the first piston 3 drives the push rod 31 to retract. At this time, the clutch disc is reconnected to the flywheel, and the clutch gear shift is completed. The gear shift operation is easier.

[0034] In this embodiment, the gear shift can also be directly realized by stepping on the foot pedal heavily, but the foot pedal is released after the gear shift is completed. The gear shift operation is more convenient and fast.

[0035] The above are only the 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 principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vehicle clutch booster, comprising a housing (1), characterized in that: An oil inlet (8) is provided on one side of the housing (1), and a push rod (31) is provided on the other side of the housing (1). An oil chamber (11) is provided in the housing (1) near the oil inlet (8). An air chamber (12) is provided in the housing (1) near the push rod (31). A first piston (3) is connected between the air chamber (12) and the oil chamber (11). The first piston (3) is fixedly connected to the push rod (31). An air intake pipe (2) is also provided on the housing (1). The side wall of the air intake pipe (2) is connected to the air chamber (12). The bottom of the air intake pipe (2) is connected to the oil chamber (11). A second piston (4) is provided in the air intake pipe (2). A control structure is provided in the air intake pipe (2) for controlling the air chamber (12) to maintain the air supply state when the oil pressure in the oil chamber (11) rises, and for controlling the air chamber (12) to stop supplying air when the oil pressure in the oil chamber (11) continues to rise and then drops.

2. The automobile clutch booster according to claim 1, characterized in that: The control structure comprises a control member (5); a sliding chamber (21) and a control chamber (22) are provided in the intake pipe (2); a sliding hole (221) is connected between the sliding chamber (21) and the control chamber (22); the second piston (4) is slidingly connected to the sliding chamber (21) and the sliding hole (221); the control member (5) abuts against the second piston (4); an adjusting member (7) is slidingly connected to the control member (5); a slidingly connected limiting member (6) is also provided on the side wall of the control chamber (22); the limiting member (6) abuts against the adjusting member (7) or the control member (5).

3. The automobile clutch booster according to claim 2, characterized in that: The control member (5) comprises a first sliding rod (52), the first sliding rod (52) being slidably connected to the control chamber (22), an abutment plate (51) being fixed to the end of the first sliding rod (52), the abutment plate (51) abutting against the bottom of the control chamber (22), a plurality of first air guide holes (511) being provided on the abutment plate (51), the projection surface of each of the first air guide holes (511) along the central axis direction of the control chamber (22) falling on the sliding hole (221) along the control chamber (22). ), a first limit plate (54) is provided on the control cavity (22) at a side away from the sliding hole (221), a plurality of second air guide holes (551) are provided on the first limit plate (54), a limit disk (55) is fixed on the first sliding rod (52), a first limit spring (541) is also sleeved on the first sliding rod (52), and two ends of the first limit spring (541) are fixedly connected to the limit disk (55) and the first limit plate (54), respectively.

4. The automobile clutch booster according to claim 3, characterized in that: A first limit block (53) is also fixed on the first sliding rod (52), and the first limit block (53) is a hemispherical structure. The adjusting member (7) is arranged between the first limit block (53) and the abutment plate (51), and the adjusting member (7) is slidably connected to the first sliding rod (52). A first limit bolt (56) is also provided between the adjusting member (7) and the abutment plate (51), and the first limit bolt (56) is fixedly connected to the first sliding rod (52). A second limit spring (521) is also sleeved on the first sliding rod (52), and the two ends of the second limit spring (521) are respectively fixedly connected to the first limit block (53) and the adjusting member (7). The adjusting member (7) is a disc-shaped structure, and an abutment portion (71) is fixed to the end of the adjusting member (7) away from the first sliding rod (52), and the cross section of the abutment portion (71) is an isosceles triangle structure.

5. The automobile clutch booster according to claim 4, characterized in that: A first sliding groove (23) is further provided on the side wall of the control cavity (22); a second sliding groove (24) is provided on the side of the first sliding groove (23) close to the control cavity (22); the cross sections of the first sliding groove (23) and the second sliding groove (24) are both circular structures; the cross section diameter of the second sliding groove (24) is smaller than the cross section diameter of the first sliding groove (23); a second limiting plate (63) is fixed in the first sliding groove (23); the limiting member (6) comprises a second limiting rod (61); the second limiting rod (61) is slidably connected to the second limiting plate (63); a second limiting bolt (64) is provided on the end of the second limiting rod (61) away from the second sliding groove (24); the second limiting bolt (64) abuts against the second limiting plate (63).

6. The automobile clutch booster according to claim 5, characterized in that: A sliding block (62) is also fixed on the second limiting rod (61), and the sliding block (62) is slidably connected to the first sliding groove (23). A third limiting spring (66) is sleeved on the second limiting rod (61), and two ends of the third limiting spring (66) are respectively fixedly connected to the sliding block (62) and the second limiting plate (63). A second limiting block (65) is fixed on the side of the second limiting rod (61) close to the control chamber (22), and a limiting inclined surface (651) is provided on the second limiting block (65), and the limiting inclined surface (651) abuts against the abutting portion (71).

7. The automobile clutch booster according to claim 2, characterized in that: A third sliding groove (212) is provided on the side of the sliding cavity (21) close to the control cavity (22), and a fourth sliding groove (211) is provided on the side of the sliding cavity (21) away from the control cavity (22). The cross sections of the third sliding groove (212) and the fourth sliding groove (211) are both circular structures. The diameter of the cross section of the third sliding groove (212) is larger than the diameter of the cross section of the fourth sliding groove (211). The second piston (4) is slidingly connected to the third sliding groove (212) and the fourth sliding groove (211) at the same time. A fourth limit spring (42) is sleeved on the second piston (4), and two sides of the fourth limit spring (42) are fixedly connected to the third sliding groove (212) and the second piston (4) respectively.

8. The automobile clutch booster according to claim 7, characterized in that: The second piston (4) is provided with a plurality of sealing grooves (41), each of the sealing grooves (41) being fixed with a first sealing rubber (411), the first sealing rubber (411) being in contact with the inner wall of the fourth sliding groove (211).

9. The automobile clutch booster according to claim 1, characterized in that: A spring groove (121) is provided in the air cavity (12), a fifth limit spring (122) is provided in the spring groove (121), the first piston (3) comprises a piston rod (35), a second sealing rubber (34) is fixed outside the piston rod (35), the second sealing rubber (34) is slidably connected to the oil cavity (11), a sliding plate (33) is fixed to the end of the piston rod (35), the sliding plate (33) is slidably connected to the air cavity (12), and two ends of the fifth limit spring (122) are respectively fixedly connected to the spring groove (121) and the sliding plate (33).

10. The automobile clutch booster according to claim 1, characterized in that: A protective sleeve (32) is also fixed outside the push rod (31), the other end of the protective sleeve (32) is fixedly connected to the housing (1), and the protective sleeve (32) is made of rubber material.

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