Clutch booster

Abstract

The utility model discloses a clutch booster which comprises a main body part, a piston part, a cylinder cover part, a hydraulic control part and a gear shifting control part, the main body part is provided with an air pressure cavity and a hydraulic cavity, and the hydraulic control part is used for controlling the communication state of the air pressure cavity of the main body part and the outside. The piston part, the cylinder cover part, the hydraulic control part and the gear shifting control part are all arranged on the main body part, the piston part penetrates through the cylinder cover part and extends into the main body part, and the piston part is connected with the gear shifting control part; and the piston part and the hydraulic control part jointly separate an air pressure cavity and a hydraulic cavity of the main body part. According to the utility model, the defect of gear shifting operation when incomplete separation exists is overcome; and eccentric wear exists between the piston and the inner wall of the valve body air cavity of the main body part of the clutch booster.

Description

TECHNICAL FIELD

[0001] The utility model belongs to clutch booster technical field, concretely relates to a clutch booster. BACKGROUND

[0002] The clutch booster is mainly used for reducing the force required by the driver when stepping on the clutch pedal, so as to more easily control the clutch.

[0003] However, the existing clutch booster has insufficient response or insufficient assistance, which may not accurately and timely feedback the operation of the driver, at this time, the clutch separation process may become incomplete or lag, resulting in the problem of gear shifting operation when not completely separated; moreover, there is a problem of eccentric wear between the piston and the inner wall of the valve body air cavity of the main part of the clutch booster. UTILITY MODEL CONTENTS

[0004] In view of the above-mentioned deficiencies of the prior art, the utility model provides a clutch booster.

[0005] The utility model aims to realize the following technical scheme:

[0006] In the first aspect, a clutch booster is provided, comprising: a main part having a gas pressure cavity and a hydraulic cavity, a piston part, a cylinder cover part, a hydraulic control part and a gear shifting control part, wherein the hydraulic control part is used for controlling the communication state of the gas pressure cavity of the main part with the outside world, the piston part, the cylinder cover part, the hydraulic control part and the gear shifting control part are all arranged on the main part, the piston part extends to the main part through the cylinder cover part, the piston part is connected with the gear shifting control part, and the piston part and the hydraulic control part jointly separate the gas pressure cavity and the hydraulic cavity of the main part, and the cylinder cover part comprises:

[0007] The cylinder cover has a cylinder cover hole;

[0008] A bearing is fixedly arranged at the cylinder cover hole of the cylinder cover and sleeved on the outer peripheral wall of the piston part;

[0009] The push rod seat has a ball socket, and at least a part of the push rod seat is arranged in the inner side end of the piston part;

[0010] A first blocking part is arranged on the inner side wall of the piston part, and the first blocking part is in contact with the outer side wall of the push rod seat to prevent horizontal transverse movement of the push rod seat;

[0011] The push rod has a spherical head at one end and an outer side of the piston part at the other end;

[0012] a second blocking portion disposed on the inner side wall of the push rod seat, the second blocking portion being in contact with the spherical end of the push rod seat; and

[0013] a support ring disposed on the inner side wall of the piston portion near the left end, the support ring being fitted on the outer peripheral wall of the push rod by interference fit.

[0014] In some embodiments, the piston portion comprises:

[0015] a piston connected to the main body portion by a return spring;

[0016] a pull rod assembly comprising a pull rod and an injection molded portion disposed on the tail of the pull rod, the length of the pull rod extending horizontally and laterally, and the injection molded portion being engaged with the piston.

[0017] In some embodiments, the head of the pull rod comprises a guide section, a transition section, and a positioning section between the guide section and the transition section.

[0018] In some embodiments, the gear shift control portion comprises:

[0019] an internally axially hollow piston rod located on the periphery of the head of the pull rod assembly, at least a portion of the inner wall of the piston rod being connected to the head of the pull rod in a fitting manner, so that the piston rod and the pull rod form a kinematic coupling structure;

[0020] a piston cylinder located on the periphery of the piston rod, the piston cylinder having two laterally spaced apart openings, the two openings of the piston cylinder being respectively in communication with the first air inlet and the first air outlet of the main body portion, the piston cylinder and the piston rod having an air passage space therebetween, the two openings being located in the air passage space, and the piston rod controlling the communication state between the first air inlet of the main body portion and the air passage space by being in abutment with the openings via a sealing ring; and

[0021] an exhaust joint fixedly connecting the piston cylinder and the main body portion, the internal space of the exhaust joint being in communication with the internal space of the piston rod.

[0022] In some embodiments, the gear shift control portion further comprises:

[0023] a filter element disposed on the exhaust joint and in communication with the internal space of the exhaust joint;

[0024] an open diaphragm disposed on the filter element; and

[0025] an exhaust cap disposed on the exhaust joint, the exhaust cap covering the filter element and the open diaphragm internally.

[0026] In some embodiments, the hydraulic control portion comprises:

[0027] a hydraulic control piston in communication with the hydraulic cavity of the main body portion;

[0028] a spring seat below the hydraulic control piston;

[0029] a second spring connecting the hydraulic control piston with the spring seat;

[0030] a gas passage switch cooperating assembly, together with the hydraulic control piston, constituting a gas passage switch, the gas passage switch controlling the communication state between the gas pressure cavity of the main body portion and the second gas inlet;

[0031] the gas passage switch being in a first state or a second state based on the position state of the hydraulic control piston and the gas passage switch cooperating assembly.

[0032] In some embodiments, when the gas passage switch is in the first state, the gas pressure cavity of the main body portion is in the communication state with the second gas inlet, and gas enters the gas pressure cavity from the second gas inlet;

[0033] when the gas passage switch is in the second state, the gas pressure cavity of the main body portion is in the closed state with the second gas inlet, and gas enters the exhaust port of the main body portion from the gas pressure cavity.

[0034] In some embodiments, the clutch booster further comprises a sealing portion sealingly connecting the piston portion to the main body portion.

[0035] In some embodiments, the sealing portion uses a double Y-ring and O-ring structure to isolate the hydraulic cavity and the gas pressure cavity, the double Y-ring comprising a gas sealing Y-ring and an oil sealing Y-ring.

[0036] The utility model discloses the beneficial effects are: when operating clutch separates, the utility model discloses the structure design of whole type full -enclosed, the function of integrated gear control portion, realize in the function of original clutch help, increase the function of stroke control and provide auxiliary gas source for gear shifting mechanism, for clutch separation help, temporary cut off power, realize easy gear shifting, simultaneously realize the gas source supply of auxiliary branch under the condition of guaranteeing that clutch separates completely, provide gear shifting help gas source, avoid the gear shifting operation drawback when not separating completely, effectively guarantee the service life of gear shifting mechanism. The utility model discloses between clutch and clutch master pump, need not additional mechanical transmission element. Be applicable to hydraulic operation gas help formula clutch system and have high low gear switching demand's heavy truck, large and medium-sized passenger car and engineering car etc. commercial vehicle. The utility model discloses through the improvement design to cylinder cover portion, solved the problem of eccentric wear of piston and main body portion valve body gas cavity inner wall. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0038] Figure 1 is a structural schematic diagram of a clutch booster provided in an embodiment of the present application;

[0039] Figure 2 is a working state diagram of the clutch booster provided in an embodiment of the present application;

[0040] Figure 3 is a disengagement clutch separation state diagram of the clutch booster provided in an embodiment of the present application;

[0041] Figure 4 is a structural schematic diagram of a piston part provided in an embodiment of the present application;

[0042] Figure 5 is a structural schematic diagram of a sealing part and related parts provided in an embodiment of the present application;

[0043] Figure 6 is a structural schematic diagram of a gear shift control part and related parts provided in an embodiment of the present application;

[0044] Figure 7 is a structural schematic diagram of a hydraulic control part and related parts provided in an embodiment of the present application;

[0045] Figure 8 is a structural schematic diagram of a cylinder cover part and related parts provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0047] As Figures 1-3As shown, in an embodiment, a clutch booster is provided, which comprises a main body part 60, a piston part 10, a cylinder cover part 50, a hydraulic control part 40 and a shift control part 30, wherein the hydraulic control part 40 is used to control the communication state of the air pressure cavity of the main body part 60 with the outside, the piston part 10, the cylinder cover part 50, the hydraulic control part 40 and the shift control part 30 are all arranged on the main body part 60, the piston part 10 extends into the main body part 60 through the cylinder cover part 50, the piston part 10 is connected with the shift control part 30, and the piston part 10 and the hydraulic control part 40 jointly separate the air pressure cavity and the hydraulic cavity of the main body part 60.

[0048] The main body part 60 is mainly a valve body structure, which has an air pressure cavity and a hydraulic cavity as well as an air inlet, an air outlet and an exhaust port.

[0049] As Figure 8As shown, in some embodiments, the cylinder cover part 50 comprises: a cylinder cover 506, the length of the cylinder cover 506 extends along the vertical direction and has a cylinder cover hole at the middle position, the cylinder cover 506 is configured with a piston 101 in the cylinder cover hole, a self-lubricating bearing 505 is sleeved on part of the outer peripheral wall of the piston 101, the self-lubricating bearing 505 is fixedly arranged at the cylinder cover hole of the cylinder cover 506, the outer peripheral wall of the self-lubricating bearing 505 is in contact with the cylinder cover hole wall of the cylinder cover 506, a horizontally transversely extending slot is arranged on the inner side of the piston 101, the slot opening extends to the left end of the piston 101, a push rod seat 507 is arranged at the right end of the slot of the piston 101, the push rod seat 507 has a right-opening ball socket, the right end head of the push rod 501 is spherical and matched with the ball socket of the push rod seat 507, the left end head of the push rod 501 is located outside the piston 101, a steel wire retainer 508 (as a second blocking part) is arranged on the inner side wall of the push rod seat 507, the steel wire retainer 508 is in contact with the tapered part of the spherical end head of the push rod 501, preventing the push rod 501 from moving and falling off; a limit washer 509 and a shaft retainer 5010 (as a first blocking part) are arranged on the inner side wall of the piston 101 in a horizontally transverse and close-to-right-end manner, the limit washer 509 and the shaft retainer 5010 are in contact with the outer side wall of the push rod seat 507 to prevent the horizontal transverse movement of the push rod seat 507; the limit washer 509 is closer to the right end head of the push rod 501 than the shaft retainer 5010, and the limit washer 509 and the shaft retainer 5010 are both arranged around the outer periphery of the push rod 501, so that the arrangement of the limit washer 509 and the shaft retainer 5010 can prevent the axial movement of the push rod seat 507; a support ring 503 is arranged on the inner side wall of the piston 101 close to the left end, the support ring 503 is sleeved on the outer peripheral wall of the push rod 501 through interference fit, thereby reducing the angular deviation of the push rod 501; a dust-proof oil seal 504 is arranged between part of the outer peripheral wall of the piston 101 and the corresponding part of the inner peripheral wall of the cylinder cover 506, the dust-proof oil seal 504 is composed of rubber vulcanized on the framework, and the dust-proof oil seal 504 and the self-lubricating bearing 505 are fixed in the cylinder cover 506 through clearance fit, effectively preventing external impurities from entering the inside of the air pressure cavity, adjusting the original air-assisted piston part positioning structure to the cylinder cover 506 part, eliminating the lateral force of the assembly (combination of the piston 101 and the cylinder cover 506) during work at the cylinder cover 506 positioning and guiding part, effectively protecting the air-assisted piston 101 and the hydraulic piston 101 part seal from the influence of lateral force, thereby improving the service life of the assembly; the left end of the dust cover 502 is connected to the left end outer peripheral wall of the piston 101, and the right end is connected to the left end outer peripheral wall of the cylinder cover 506, the dust cover 502 is limited to be arranged outside the cylinder cover 506, the dust cover 502 is not directly communicated with the inside of the air pressure cavity, thereby eliminating the risk factors that impurities enter the inside of the air pressure cavity of the booster due to the damage of the dust cover 502, and improving the service life of the assembly.The push rod 501 is provided with a supporting ring 503 structure, which reduces the situation that the booster is not assembled in place due to the deflection of the push rod 501, and ensures that the deflection angle of the push rod 501 during use is within a controllable range, thereby reducing the decomposition of the output force of the booster and improving the output performance of the push rod 501. The push rod 501 is connected to the valve body of the main body part 60 through a return spring 603, and the length of the return spring 603 extends horizontally and transversely.

[0050] Application of the piston 101 and the cylinder cover 506 positioning structure: the lateral force generated by the push rod 501 during the operation of the assembly is well distributed on the guide parts of the cylinder cover 506 (main), the pneumatic booster piston 101 (auxiliary), and the hydraulic piston 101 (auxiliary) parts, forming a lever balance effect. Combined with the integral valve body and the integral piston 101, the lateral force generated during the operation of the assembly is effectively balanced and controlled, and the potential factor of the side wear between the pneumatic booster piston 101 and the inner wall of the valve cavity of the main body part 60 is solved.

[0051] As shown in Figure 4 some embodiments, the piston 101 adopts an integrated structure, the piston 101 has a clamping groove, the length of the pull rod assembly 102 extends horizontally and transversely, the left end of the pull rod assembly 102 has a clamping part, and the clamping part of the pull rod assembly 102 is gap-fitted with the clamping groove of the piston 101 to prevent the left and right movement of the pull rod assembly 102. Specifically, the pull rod assembly 102 is composed of a cold heading of the integral pull rod 1021 and an injection molding part 1022 (clamping part) made of polyformaldehyde material at the end, which ensures the straightness and strength of the pull rod assembly 102 and eliminates the risk of performance reduction of the assembly due to the falling of the pull rod 1021 and the injection molding part 1022. The head structure of the pull rod assembly 102 adopts a three-section structure design, which includes a guide section, a transition section, and a positioning section between the guide section and the transition section, increases the structure design of transition, positioning, and guidance, and eliminates the risk of performance reduction of the shift control valve due to assembly problems. The piston 101 is provided with a guide sleeve 104 and a Y-shaped ring 103 near the outer peripheral wall of the pull rod assembly 102. The piston 101 is connected to the main body part 60 through a return spring.

[0052] As shown in Figure 5As shown, in some embodiments, the sealing portion 20 seals the piston portion 10 to the main body portion 60. The sealing portion 20 adopts a Y-ring with a double-lip structure and uses a structure of double Y-rings and O-rings to isolate the hydraulic chamber from the pneumatic chamber. Specifically, the support gasket 201 is fitted onto the outer peripheral wall of the right end portion of the piston 101. The outer peripheral wall of the right end portion of the piston 101 is also fitted with an oil sealing Y-ring 202, a sealing pressure ring 204, and an air sealing Y-ring 206. A limit nut 205 is also threaded onto the outer peripheral wall of the right end portion of the piston 101. The limit nut 205, the air sealing Y-ring, and the other components are arranged in the following order from left to right: limit nut 205, air sealing Y-ring, and sealing pressure ring 206. The components include an O-ring 206, a sealing pressure ring 204, an oil-sealing Y-ring 202, and a support gasket 201. An O-ring 203 is fitted onto the sealing pressure ring 204 and contacts the inner wall of the hydraulic cavity of the main body 60. A limit nut 205 fixes the assembly position of the sealing pressure ring 204, thereby reducing the axial movement clearance of the oil-sealing Y-ring 202. This solves the risk of decreased sealing performance between the hydraulic and pneumatic cavities in the main body 60 due to excessive movement clearance when two or more components are fitted together. The Y-ring, with its double-lip structure design, increases the sealing effect and service life of the Y-ring, thus improving the service life of the main body 60.

[0053] like Figure 6 As shown, in some embodiments, the shift control part 30 includes a piston cylinder 303. An O-ring is disposed between the outer peripheral wall of the piston cylinder 303 and the inner peripheral wall of the valve body. The number of O-rings is two and they are arranged laterally at intervals. A piston rod 306 is disposed on the inner wall of the piston cylinder 303. The piston cylinder 303 has two openings arranged laterally at intervals. The two openings of the piston cylinder 303 are respectively connected to the first air inlet and the first air outlet of the main body part 60. There is a ventilation space between the piston cylinder 303 and the piston rod 306. The two openings are located in the ventilation space. The piston rod 306 controls the communication state between the first air inlet of the main body part 60 and the ventilation space by the sealing ring being in a docking state with the opening (moving the sealing ring, such as the O-ring, relative to the opening to block or open the opening).

[0054] The outer peripheral wall of the piston rod 306 is provided with O-rings between the inner peripheral wall of the piston cylinder 303, the number of O-rings is two and is arranged transversely, the O-rings are sleeved on the outer peripheral wall of the piston rod 306, the piston rod 306 is axially hollow inside, is located at the periphery of the head of the pull rod assembly 102, at least a part of the inner wall of the piston rod 306 is connected with the head of the pull rod, so that the piston rod 306 and the pull rod 1021 form a motion connection structure; the head of the pull rod assembly 102 is extended into the piston rod 306 from the piston cylinder 303, the outer peripheral wall of the pull rod assembly 102 is sleeved with O-rings 301 away from the head thereof and a positioning seat 302, the positioning seat 302 is connected with the inner wall of the valve body and contacts the left end of the piston cylinder 303, the piston cylinder 303 is threadedly connected on the valve body through an exhaust joint 307 (the exhaust joint 307 is located at the right end of the piston cylinder 303) to press and fix the positioning seat 302, thereby eliminating the risk of change in opening stroke of the shift control valve (the valve body where the shift control part 30 is located) caused by excessive axial play, and the internal space of the exhaust joint 307 communicates with the internal space of the piston rod 306; the outer peripheral wall of the pull rod assembly 102 is sleeved with two limiting washers 304 and two clamping retaining rings 305 near the head thereof, the two limiting washers 304 and the two clamping retaining rings 305 are arranged alternately, the clamping retaining rings 305 are tightly clamped with the pull rod assembly 102 through interference fit, so that the piston rod 306 and the pull rod assembly 102 form an integral whole; a filter element 308 is arranged in the right end of the exhaust joint 307 through clearance fit and communicates with the internal space of the exhaust joint 307, an open diaphragm 309 is arranged at the right end of the filter element 308 and is pressed against the open diaphragm 309 by interference fit of a fastening retaining ring 3011 with the exhaust joint 307, and an exhaust cap 3010 is fastened on the exhaust joint 307 through a buckle structure, the exhaust cap 3010 covers the filter element 308 and the open diaphragm 309 inside, thereby forming a shift control valve structure with a filter element 308 exhaust structure;

[0055] Through cooperation of the pull rod assembly 102 and the clamping retaining ring 305, the pull rod assembly 102 and the piston rod 306 form an integral whole, the movement distance of the piston rod 306 in the shift control part 30 is controlled by the running distance of the clutch booster cylinder piston 101, so that the working state of the shift control part 30 is controlled by the movement stroke of the cylinder piston 101;

[0056] Through structural design of the filter element 308 and the open diaphragm 309 and addition of an exhaust port to isolate external environmental impurities, the dustproof performance of the exhaust port structure of the shift control part 30 is further optimized and improved, the risk of early failure of a sealing element (such as an O-ring) caused by entry of external impurities into the shift control valve is eliminated, and the service life of the shift control part 30 is effectively improved;

[0057] As Figure 7As shown, in some embodiments, the hydraulic control part 40 comprises a hydraulic control piston 401 which is in communication with the hydraulic cavity of the main body part 60, the length of the hydraulic control piston 401 extends vertically and is provided with three sealing grooves on the side wall, in the order from top to bottom, a Y-shaped ring 402 is installed in the first sealing groove and the second sealing groove, and an O-shaped ring 403 is installed in the third sealing groove and is in interference fit with the inner cavity of the integrated valve body, thereby prolonging the service life of the hydraulic control part 40 through multiple sealing. The lower periphery of the hydraulic control piston 401 is provided with an air inlet seat 404 which is fixedly connected with the valve body where the hydraulic control part 40 is located and is provided with O-shaped rings at different positions vertically between the two; the lower end periphery of the hydraulic control piston 401 is provided with a valve 405 which is tightly attached to the air inlet seat 404 through a first spring 4013 which extends vertically in length, forming a static seal, and an air sealing Y-shaped ring 406 is fixed between the valve 405 and the air inlet seat 404; a spring seat 4012 is arranged below the air inlet seat 404, the valve 405 is on the movement path of the hydraulic control piston 401, the lower end of the first spring 4013 is connected with the spring seat 4012, the bottom surface of the spring seat 4012 is provided with an exhaust diaphragm 4011, and the bottom of the spring seat 4012 is provided with an exhaust pressing plate 409; the exhaust pressing plate 409 has a paper gasket 407 between the exhaust pressing plate 409 and the valve body where the hydraulic control part 40 is located, which isolates external impurities, and the exhaust pressing plate 409 is fixed on the valve body by tightening the bolt 408. The lower end of the hydraulic control piston 401 is connected with the spring seat 4012 through a second spring 4010. The air inlet seat 404, the valve 405 and the first spring 4013 are part of the gas channel switch matching assembly, and the gas channel switch matching assembly and the hydraulic control piston 401 together constitute a gas channel switch which controls the communication state between the gas pressure cavity of the main body part 60 and the second air inlet; the gas channel switch is in the first state or the second state based on the position state of the hydraulic control piston 401 and the gas channel switch matching assembly.

[0058] When the gas channel switch is in the first state, the gas pressure cavity of the main body part is in communication with the second air inlet, and gas enters the gas pressure cavity from the second air inlet;

[0059] When the gas channel switch is in the second state, the gas pressure cavity of the main body part is in closed state with the second air inlet, and gas enters the exhaust port of the main body part from the gas pressure cavity.

[0060] When the clutch is separated, the total pump pressure oil is input from the oil inlet to the B cavity, and acts on the integral piston 101 to generate a leftward thrust on the integral piston 101. At the same time, the hydraulic pressure of the B cavity acts on the hydraulic control piston 401 to move the hydraulic control piston 401 downward. When the hydraulic pressure gradually increases to overcome the spring force of the second spring 4010, the valve 405 is pushed downward to open the air inlet channel, and the compressed air flows into the air pressure cavity A cavity through the air inlet and the valve 405. Under the simultaneous action of the air pressure, the hydraulic pressure and the spring force of the return spring, the integrated piston 101 moves the push rod 501 to the left to output a thrust force, and the clutch is separated. At this time, the pull rod assembly 102 moves to the left with the integrated piston 101, drives the piston rod 306 to move to the left, and opens the air outlet channel, so that the compressed air in the air inlet of the gear shift control part flows to the auxiliary branch to meet the air demand of the gear shift mechanism.

[0061] When the clutch separation assist is released, the clutch pedal is released, and the hydraulic pressure of the oil inlet decreases. Under the action of the second spring 4010 and the air pressure reaction force, the hydraulic control piston 401 moves upward to close the air inlet channel and open the air outlet channel, and the compressed air is discharged from the air outlet to the atmosphere. At the same time, under the action of the clutch pressure plate return force, the push rod 501 drives the integrated piston 101 to return to the initial position, and the clutch separation is released. At this time, the pull rod assembly 102 moves to the right with the integrated piston 101, drives the piston rod 306 to move to the right, and closes the air outlet channel, so as to cut off the flow of compressed air in the air inlet of the gear shift control part to the auxiliary branch.

[0062] The air inlet channel: the air source enters the integral valve body from the air inlet 11, passes through the air inlet hole of the air inlet seat 404, forms an air inlet channel through the gap between the air inlet seat 404 and the hydraulic control piston 401 (at this time, the hydraulic control piston 401 forms a seal with the valve 405 to prevent air pressure from entering the air outlet through the valve 405), and finally enters the A cavity through the air inlet channel in the integral valve body.

[0063] The breathing channel: at this time, with the movement of the integrated piston 101 to the front under the action of the air pressure, the air in the front cavity C cavity is pushed to flow through the internal breathing channel in the integral valve body to the channel between the spring seat 412 and the exhaust diaphragm 411, and to the atmosphere;

[0064] Outlet channel: refers to the outlet (22) of the shift control part structure, as the integrated piston 101 moves to the left under the action of air pressure, thereby driving the pull rod assembly 102 to move to the left, the pull rod assembly 102 forms an integral whole with the piston rod 306 by embracing the shift ring 305, and moves to the left synchronously, when the O-ring on the piston rod 306 moves to a position beyond the outlet hole channel of the piston cylinder 303, the compressed air of the 12 outlet of the shift control part flows to the outlet hole of the piston cylinder 303 through the inlet hole of the piston cylinder 303, and flows to the auxiliary branch through the 22 outlet of the shift control part.

[0065] The above description is merely preferred embodiments of one or more embodiments of the present specification, and is not intended to limit one or more embodiments of the present specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification shall be included in the protection scope of one or more embodiments of the present specification.

Claims

1. A clutch booster, characterized by The application relates to a piston-cylinder assembly, which comprises a main body part with a pneumatic cavity and a hydraulic cavity, a piston part, a cylinder cover part, a hydraulic control part and a gear shift control part, wherein the hydraulic control part is used for controlling the communication state between the pneumatic cavity of the main body part and the outside world, the piston part, the cylinder cover part, the hydraulic control part and the gear shift control part are arranged on the main body part, the piston part extends into the main body part through the cylinder cover part, the piston part is connected with the gear shift control part, the piston part and the hydraulic control part jointly separate the pneumatic cavity and the hydraulic cavity of the main body part, the cylinder cover part comprises: a cylinder cover with a cylinder cover hole; a bearing fixedly arranged at the cylinder cover hole of the cylinder cover and sleeved on the outer peripheral wall of the piston part; a push rod base with a ball socket, at least a part of which is arranged in the inner side end of the piston part; a first blocking part arranged on the inner side wall of the piston part, which is in contact with the outer side wall of the push rod base to prevent horizontal transverse movement of the push rod base; a push rod with a spherical head at one end matched with the ball socket of the push rod base and with the other end located at the outer side of the piston part; a second blocking part arranged on the inner side wall of the push rod base, which is in contact with the spherical head of the push rod base; and a supporting ring arranged on the inner side wall of the piston part close to the left end, which is sleeved on the outer peripheral wall of the push rod through interference fit.

2. The clutch booster according to claim 1, characterized by The piston part comprises: a piston connected with the main body part through a return spring; a pull rod assembly comprising a pull rod and an injection molding part arranged at the tail of the pull rod, the length of the pull rod extends along the horizontal transverse direction, and the injection molding part is clamped with the piston.

3. The clutch booster according to claim 2, characterized in that The head of the pull rod comprises a guide section, a transition section and a positioning section between the guide section and the transition section.

4. The clutch booster according to claim 3, characterized in that The gear shift control part comprises: an internally axially hollow piston rod located at the periphery of the head of the pull rod assembly, at least a part of the inner wall of the piston rod is matched and connected with the head of the pull rod, so that the piston rod and the pull rod constitute a motion linkage structure; a piston cylinder located at the periphery of the piston rod, the piston cylinder has two horizontally spaced apart openings, the two openings of the piston cylinder are respectively communicated with the first air inlet and the first air outlet of the main body part, the piston cylinder and the piston rod have a ventilation space, the two openings are located in the ventilation space, and the piston rod controls the communication state between the first air inlet of the main body part and the ventilation space through the abutment state of the sealing ring and the opening; and an exhaust joint fixedly connecting the piston cylinder and the main body part, the inner space of the exhaust joint is communicated with the inner space of the piston rod.

5. The clutch booster according to claim 4, characterized in that The gear shift control part further comprises: a filter element arranged on the exhaust joint and communicated with the inner space of the exhaust joint; an open diaphragm arranged on the filter element; and an exhaust cap arranged on the exhaust joint, which covers the filter element and the open diaphragm inside.

6. The clutch booster of claim 1, wherein The hydraulic control part comprises: a hydraulic control piston communicated with the hydraulic cavity of the main body part; a spring seat located below the hydraulic control piston; a second spring connecting the hydraulic control piston and the spring seat; a gas passage switch matching assembly, together with the hydraulic control piston, forming a gas passage switch, the gas passage switch controlling the state of the gas pressure cavity of the main body part and the second gas inlet being in communication; the gas passage switch being in a first state or a second state based on the position state of the hydraulic control piston and the gas passage switch matching assembly.

7. The clutch booster according to claim 6, characterized in that: when the gas passage switch is in the first state, the gas pressure cavity of the main body part and the second gas inlet are in the state of being in communication, and gas enters the gas pressure cavity from the second gas inlet; when the gas passage switch is in the second state, the gas pressure cavity of the main body part and the second gas inlet are in the state of being closed, and gas enters the exhaust port of the main body part from the gas pressure cavity.

8. The clutch booster according to claim 1, characterized by Further comprising: a sealing part sealingly connecting the piston part on the main body part.

9. The clutch booster according to claim 8, characterized in that Further comprising: the sealing part using the structure of double Y-shaped rings and O-shaped rings to isolate the hydraulic cavity and the gas pressure cavity, the double Y-shaped rings including a gas sealing Y-shaped ring and an oil sealing Y-shaped ring.

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