Electrically controlled clutch booster and vehicle

Abstract

The application relates to the technical field of working machines, and provides an electric control clutch booster and a vehicle. The electric control clutch booster comprises a shell, a piston cylinder, a first piston, a second piston, a driving assembly and a push rod assembly. The inside of the shell is sequentially provided with a first cylinder barrel part and a second cylinder barrel part which are connected in communication in the axial direction. The piston cylinder is slidably sleeved in the first cylinder barrel part. The first piston is slidably sleeved in the second cylinder barrel part. The second piston is slidably sleeved in the piston cylinder. The one end of the piston cylinder close to the second cylinder barrel part is provided with a first opening. The air inlet cavity is arranged between the outer side wall of the second piston and the inner side wall of the first cylinder barrel part. The cavity structure is arranged in the second piston. The cavity structure is provided with a second opening. The first end of the second piston is provided with a valve piece. The application realizes the air inlet and exhaust actions and the half clutch action of the clutch booster through a mechanical structure. The displacement of the piston cylinder is controlled through the rotation angle of the clutch pedal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of working machines, in particular to an electric control clutch booster and a vehicle. BACKGROUND

[0002] The clutch is a commonly used component in mechanical transmission, which can separate or engage the transmission system at any time, and the clutch booster is used to help increase the output force of the clutch operating system and facilitate operation when the operated clutch is separated or engaged.

[0003] In the prior art, a hydraulic control gas booster clutch booster is generally used in the manual transmission type of commercial vehicles and heavy-duty trucks, and the booster assists in completing the clutch separation and engagement operation during shifting and starting. The existing electric control clutch booster generally uses an electromagnetic valve to control the booster inlet and exhaust.

[0004] However, the clutch booster in the prior art has poor reliability in controlling the inlet and exhaust by using an electromagnetic valve, and the electromagnetic valve in the clutch booster is usually used with hydraulic oil, which may cause system failure due to unqualified oil and incomplete air exhaust. SUMMARY

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides an electric control clutch booster and a vehicle, which completes the inlet and exhaust actions by a mechanical inlet and exhaust structure, improves the action accuracy of the inlet and exhaust, and realizes the inlet and exhaust actions and semi-clutch actions of the booster by a mechanical valve core structure, avoiding the drawbacks of using an electromagnetic valve to control the inlet and exhaust in the prior art, and effectively improving the reliability.

[0006] The present application provides an electric control clutch booster, comprising a housing, a piston cylinder, a first piston, a second piston, a driving assembly and a push rod assembly.

[0007] The inside of the housing is sequentially provided with a first cylinder portion and a second cylinder portion in communication in the axial direction, the piston cylinder is slidably sleeved in the first cylinder portion, the first piston is slidably sleeved in the second cylinder portion, and the side wall of the housing is provided with an air inlet and an exhaust port.

[0008] The second piston is slidably sleeved in the piston cylinder, and one end of the piston cylinder close to the second cylinder portion is provided with a first opening, the first end of the second piston extends out of the first opening, and the first opening is closed when the second piston is in a first position relative to the piston cylinder, and a first elastic member is arranged between the second end of the second piston and the piston cylinder.

[0009] An air inlet cavity is arranged between the outer sidewall of the second piston and the inner sidewall of the first cylinder part, the air inlet cavity is communicated with the air inlet, and the air inlet cavity is communicated with the inner cavity of the second cylinder part when the first opening is opened;

[0010] The second piston is internally provided with a cavity structure, the cavity structure is provided with a second opening, the second opening is arranged at the first end of the second piston, the sidewall of the piston cylinder and the second piston is provided with a corresponding exhaust passage, the exhaust passage is communicated with the cavity structure, and the exhaust passage is communicated with the exhaust port when the piston cylinder is in the second position relative to the shell;

[0011] The first end of the second piston is provided with a valve piece for plugging the second opening, and a second elastic member is arranged between the piston cylinder and the valve piece, the valve piece is separated from the second opening in a normal state;

[0012] The push rod assembly is connected with the first piston, and when the first piston is in the third position relative to the second piston, the push rod assembly extrudes the valve piece to the second opening, so that the valve piece seals the second opening, and when the first piston is in the fourth position relative to the second piston, the push rod assembly extrudes the second piston and the first elastic member, so that the second piston is separated from the first opening and the first opening is opened;

[0013] The driving assembly is in transmission connection with the piston cylinder, and is used for driving the piston cylinder to displace in the axial direction.

[0014] The electrically controlled clutch booster provided by the application further comprises an angle sensor and a control system, wherein,

[0015] The angle sensor is used for sensing the rotation angle of the clutch pedal;

[0016] The control system is electrically connected with the angle sensor and the driving assembly, and the control system is used for controlling the driving assembly to drive the axial displacement amount of the piston cylinder according to the rotation angle of the clutch pedal.

[0017] The electrically controlled clutch booster provided by the application further comprises a displacement sensor, the displacement sensor is used for obtaining the axial displacement amount of the piston cylinder, the displacement sensor is electrically connected with the control system, and the control system is used for controlling the driving assembly to start and stop according to the sensed displacement amount of the displacement sensor.

[0018] The electric control clutch booster provided by the application, the driving assembly comprises a driving part and a transmission part, the driving part is connected with the transmission part, the transmission part is sleeved in the first cylinder part in a slidable manner and abuts against one end of the piston cylinder away from the second cylinder part, so that the driving part drives the piston cylinder to slide along the inner wall of the first cylinder part through the transmission part;

[0019] The displacement sensor obtains the axial displacement of the piston cylinder by sensing the axial displacement of the transmission part.

[0020] The first elastic member is arranged between the second end of the second piston and the transmission part.

[0021] The electric control clutch booster provided by the application, the inner diameter of the first opening is smaller than the inner cavity diameter of the piston cylinder, and the outer periphery of the second piston is circumferentially provided with a first annular protrusion, the outer diameter of the first annular protrusion is smaller than the inner cavity diameter of the piston cylinder and larger than the inner diameter of the first opening.

[0022] The electric control clutch booster provided by the application, the outer periphery of the second piston is further provided with a second annular protrusion and a third annular protrusion, the second annular protrusion and the third annular protrusion are circumferentially arranged along the second piston, and the second annular protrusion and the third annular protrusion are in close fit with the inner wall of the piston cylinder; the second annular protrusion is arranged in a spaced manner with the first annular protrusion to form the air inlet cavity therebetween; and the third annular protrusion is arranged in a spaced manner with the second annular protrusion to form part of the exhaust passage therebetween.

[0023] The electric control clutch booster provided by the application, the push rod assembly comprises a push rod base and a push rod, the push rod base is arranged in and fixedly connected to the first piston; one end of the push rod base corresponds to the valve plate, and the other end is connected with the push rod.

[0024] The electric control clutch booster provided by the application, the electric control clutch booster further comprises an end cover, the end cover is fixedly connected to one end of the second cylinder part away from the first cylinder part; the push rod is arranged in the end cover and partially extends out of the end cover.

[0025] The electric control clutch booster provided by the application, the electric control clutch booster further comprises a third elastic member, the third elastic member is arranged in the second cylinder part, and the third elastic member acts on the first piston to balance the pushing force of the push rod assembly on the first piston (12).

[0026] The application further provides a vehicle comprising a clutch and an electric control clutch booster, the electric control clutch booster being any one of the electric control clutch boosters described above.

[0027] The technical scheme provided by the present application sets a mechanical intake structure, that is, an intake cavity is arranged between the outer sidewall of the second piston and the inner sidewall of the first cylinder part, and a first opening is arranged at the first end of the second piston; when the first opening is communicated with the inner cavity of the second cylinder part and high-pressure gas is introduced into the intake cavity, the clutch booster completes the intake action; the present application also sets a mechanical exhaust structure, that is, a cavity structure is arranged in the second piston, the sidewall of the piston cylinder and the sidewall of the second piston are provided with corresponding exhaust passages, and a second opening is arranged at the first end of the second piston; when the second opening is opened, the clutch booster completes the exhaust action; when the second opening is opened and the first opening is closed, the clutch booster is in the exhaust state; when the second opening is closed and the first opening is opened, the clutch booster is in the intake state; the present application completes the intake and exhaust actions through the mechanical intake and exhaust structure, and the opening and closing control of the first opening and the second opening improves the action accuracy of the intake and exhaust; when the clutch pedal is stopped in the middle of the reset, the first opening and the second opening are closed at the same time, the first piston is maintained at the current position, and the clutch booster realizes the half-clutch action; therefore, the present application realizes the intake and exhaust actions and the half-clutch action of the booster through the mechanical valve core structure. Furthermore, the electrically controlled clutch booster and the vehicle provided by the present application complete the intake and exhaust actions through the mechanical intake and exhaust structure, improve the action accuracy of the intake and exhaust, realize the intake and exhaust actions and the half-clutch action of the booster through the mechanical valve core structure, avoid the drawbacks of using the electromagnetic valve to control the intake and exhaust in the prior art, and effectively improve the reliability. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0029] Figure 1 is a structural schematic view of the clutch booster when the second piston is in the first position relative to the piston cylinder according to the embodiment of the present application;

[0030] Figure 2 is a structural schematic view of the clutch booster when the first piston is in the third position relative to the second piston according to the embodiment of the present application;

[0031] Figure 3 is a structural schematic view of the clutch booster when the first piston reaches the maximum displacement in the second cylinder part according to the embodiment of the present application;

[0032] Reference signs:

[0033] 1, drive part; 2, transmission part; 3, first elastic member; 4, second piston; 5, second elastic member; 6, valve plate; 7, end cover; 8, piston cylinder; 9, shell; 10, third elastic member; 11, push rod base; 12, first piston; 13, push rod; 14, exhaust passage; 15, air inlet cavity. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0039] The following will be described in conjunction with Figures 1 to 3 The present application provides an electrically controlled clutch booster system, which mainly comprises a housing 9, a piston cylinder 8, a first piston 12, a second piston 4, a driving assembly and a push rod 13 assembly. The inside of the housing 9 is sequentially provided with a first cylinder portion and a second cylinder portion which are in communication in the axial direction. The piston cylinder 8 is slidably sleeved in the first cylinder portion. The first piston 12 is slidably sleeved in the second cylinder portion. The diameter of the second cylinder portion is greater than that of the first cylinder portion. The side wall of the housing 9 is provided with an air inlet and an air outlet.

[0040] In the present embodiment, one end of the second piston 4 close to the second cylinder portion is the first end of the second piston 4, and the other end of the second piston 4 away from the piston cylinder 8 is the second end of the second piston 4. The second piston 4 is slidably sleeved in the piston cylinder 8, and the one end of the piston cylinder 8 close to the second cylinder portion is provided with a first opening. The first end of the second piston 4 protrudes out of the first opening, and the first opening is closed when the second piston 4 is in the first position relative to the piston cylinder 8. It should be noted that the first position refers to the farthest position that the second piston 4 can move in the direction of the first opening in the piston cylinder 8. In the first position, the second piston 4 abuts against and seals the first opening.

[0041] Further, the inner diameter of the first opening is smaller than the inner cavity diameter of the piston cylinder 8, and the outer periphery of the second piston 4 is circumferentially provided with a first annular protrusion. The outer diameter of the first annular protrusion is smaller than the inner cavity diameter of the piston cylinder 8 and greater than the inner diameter of the first opening. The first annular protrusion is used to seal the first opening when the second piston 4 is in the first position.

[0042] Specifically, a first elastic member 3 is arranged between the second end of the second piston 4 and the piston cylinder 8. The first elastic member 3 is compressed between the second end of the second piston 4 and the piston cylinder 8. When the first end of the second piston 4 and the valve plate 6 are not in contact, the first elastic member 3 can extrude the second end of the second piston 4, so that the second piston 4 closes the first opening.

[0043] AsFigure 1 As shown, in the present embodiment, the outer side wall of the second piston 4 and the inner side wall of the first cylinder portion are provided with an intake cavity 15, the intake cavity 15 is in communication with the intake port, and when the first opening is opened, the intake cavity 15 is in communication with the inner cavity of the second cylinder portion, and high-pressure gas is introduced into the intake cavity 15 from the intake port.

[0044] In the present embodiment, the second piston 4 is internally provided with a cavity structure, the cavity structure is provided with a second opening, the second opening is provided at the first end of the second piston 4, the side wall of the piston cylinder 8 and the second piston 4 is provided with a corresponding exhaust passage 14, the exhaust passage 14 is in communication with the cavity structure, and when the piston cylinder 8 is in the second position relative to the housing 9, the exhaust passage 14 is in communication with the exhaust port, and the exhaust port is provided at a fixed position of the housing 9.

[0045] Further, the outer periphery of the second piston 4 is provided with a second annular protrusion and a third annular protrusion, the second annular protrusion and the third annular protrusion are circumferentially arranged along the second piston 4, the second annular protrusion and the third annular protrusion are in sealing cooperation with the inner wall of the piston cylinder 8, the second annular protrusion is provided with a sealing ring at the cooperation position with the inner wall of the piston cylinder 8, so as to isolate the exhaust passage 14 and the external space, and the third annular protrusion is also provided with a sealing ring at the cooperation position with the inner wall of the piston cylinder 8, so as to isolate the exhaust passage 14 and the intake cavity 15 from each other; the second annular protrusion is spaced apart from the first annular protrusion to form the intake cavity 15 therebetween; and the third annular protrusion is spaced apart from the second annular protrusion to form part of the exhaust passage 14 therebetween.

[0046] In this way, compared with the electromagnetic valve control of the prior art, the present embodiment can complete the intake and exhaust actions through a mechanical intake and exhaust structure by means of the mechanical sealing control of the exhaust port, the intake port, the exhaust passage 14, the cavity structure in the second piston 4, the intake cavity 15, and the first opening and the second opening, thereby improving the action accuracy of the intake and exhaust, and avoiding the occurrence of the clutch booster failure problem caused by the failure of the electromagnetic valve structure; moreover, the present embodiment is provided with a pure mechanical intake and exhaust structure, and no hydraulic oil is used, thereby avoiding the occurrence of clutch operation system failures caused by unqualified oil products, incomplete air exhaust, and the like.

[0047] It should be noted that the exhaust port is provided at a fixed and pre-set position of the housing 9, and when the part of the exhaust passage 14 provided on the piston cylinder 8 is in communication with the exhaust port provided on the housing 9, the piston cylinder 8 is in the second position relative to the housing 9.

[0048] Specifically, in the present embodiment, the sealing ring can be a ring-shaped sealing ring or the like, and the type of the sealing ring is not specifically limited herein.

[0049] As shown in the drawings, Figure 2As shown, in the embodiment, the first end of the second piston 4 is provided with a valve piece 6 for plugging the second opening, and a second elastic member 5 is arranged between the piston cylinder 8 and the valve piece 6, one end of the second elastic member 5 is fixedly connected at a position between the side wall of the piston cylinder 8 and the first opening, and the other end of the second elastic member 5 is fixedly connected on one side of the valve piece 6, and in the normal state, the valve piece 6 is separated from the second opening, and it should be noted that the normal state of the second elastic member 5 refers to the state when the second elastic member 5 is not stretched or contracted.

[0050] In the embodiment, the push rod 13 assembly is connected with the first piston 12, and when the first piston 12 is in the third position relative to the second piston 4, the push rod 13 assembly extrudes the valve piece 6 to the second opening, so that the valve piece 6 seals the second opening, and when the first piston 12 is in the fourth position relative to the second piston 4, the push rod 13 assembly extrudes the second piston 4 and the first elastic member 3, so that the second piston 4 is separated from the first opening and the first opening is opened.

[0051] Further, the push rod assembly includes a push rod base 11 and a push rod 13, the push rod base 11 is arranged in and fixedly connected to the first piston 12, both ends of the push rod base 11 extend out of the first piston 12, one end of the push rod base 11 corresponds to the valve piece 6, and the other end of the push rod base 11 is connected with the push rod 13, and one end of the push rod 13 is embedded in the push rod base 11.

[0052] It should be noted that when the second piston 4 is driven by the driving assembly to move the piston cylinder 8, the first elastic member 3 drives the second piston 4 to move, so that the second piston 4 moves in the first cylinder portion together with the piston cylinder 8, when the first piston 12 is in the third position relative to the second piston 4, the first opening is in a closed state, one side of the valve piece abuts against one end of the push rod base 11, and the other side of the valve piece abuts against the second piston 4 to seal the second opening.

[0053] In the embodiment, the electric control clutch booster also includes an end cover 7, the end cover 7 is fixedly connected to the end of the second cylinder portion away from the first cylinder portion, and the side wall of the end of the second cylinder portion away from the first cylinder portion is also provided with a sealing ring in the circumferential inner portion, for sealing the inner cavity of the second cylinder portion, and one end of the push rod 13 away from the push rod base 11 is arranged in the end cover 7 and partially extends out of the end cover 7.

[0054] In the embodiment, one sealing ring is arranged between the outer wall of the piston cylinder 8 and the first cylinder portion and at both ends of the intake cavity 15 of the piston cylinder 8, respectively, for isolating the intake cavity 15 and the inner cavity of the second cylinder portion, and isolating the intake cavity 15 and the external space; and a sealing ring is also arranged between the outer wall of the first piston 12 and the inner wall of the second cylinder portion and close to the end of the end cover 7, for ensuring the stability of the air pressure in the inner cavity of the second cylinder portion when the first opening and the second opening are both closed.

[0055] In possible embodiments, a sealing ring can also be arranged between the outer wall of the first piston 12 and the inner wall of the second cylinder portion, close to one end of the end cover 7. The sealing ring can be a Y-shaped sealing ring, which is used for reciprocating high-pressure sealing and acts on the high-pressure part of the inner cavity of the second cylinder portion.

[0056] In the present embodiment, the driving assembly is in transmission connection with the piston cylinder 8 and is used to drive the piston cylinder 8 to axially displace by a set distance. The driving assembly includes a driving part 1 and a transmission part 2. The driving part 1 is connected with the transmission part 2. The transmission part 2 is slidably sleeved in the first cylinder portion and is fixedly connected to one end of the piston cylinder 8 away from the second cylinder portion. In this way, the driving part 1 drives the piston cylinder 8 to slide along the inner wall of the first cylinder portion through the transmission part 2.

[0057] Specifically, the driving part 1 can be a power output member such as an electric motor, and the transmission part 2 can be a structure such as a lead screw base. The specific types of the driving part 1 and the transmission part 2 are not limited herein.

[0058] In the present embodiment, the electrically controlled clutch booster further includes an angle sensor, a displacement sensor, and a control system. The angle sensor can be arranged on the clutch pedal control arm and is used to sense the rotation angle of the clutch pedal. The displacement sensor can be arranged on the periphery of the transmission part 2 and is used to obtain the axial displacement amount of the piston cylinder 8 driven by the transmission part 2. The control system is electrically connected with the angle sensor and the driving assembly. The angle sensor sends the sensed clutch pedal rotation angle signal to the control system. The control system calculates the preset axial displacement amount of the piston cylinder 8 according to the clutch pedal rotation angle signal. The control system sends the axial displacement signal of the piston cylinder 8 to the driving part 1. The driving part 1 correspondingly drives the transmission part 2 to move. The transmission part 2 in turn drives the piston cylinder 8 to axially displace. The preset axial displacement amount of the piston cylinder 8 and the rotation angle amount of the clutch pedal correspond one-to-one.

[0059] Further, the displacement sensor is electrically connected with the control system. When the angle sensor sends the clutch pedal rotation angle signal to the control system, the displacement sensor also simultaneously sends the sensed displacement amount signal of the piston cylinder 8 to the control system. When the sensed displacement amount signal of the piston cylinder 8 and the preset displacement amount signal of the piston cylinder 8 completely match, the control system controls the driving part 1 to stop. The control system is used to control the driving assembly to start and stop according to the sensed displacement amount of the displacement sensor. The control system is also used to control the driving assembly to drive the axial displacement amount of the piston cylinder 8 according to the rotation angle of the clutch pedal.

[0060] Specifically, one end of the transmission part 2 away from the driving part 1 is fixedly connected to the piston cylinder 8. The axial displacement of the transmission part 2 in the first cylinder portion and the axial displacement of the piston cylinder 8 in the first cylinder portion are kept synchronous. The displacement sensor obtains the axial displacement amount of the piston cylinder 8 by sensing the axial displacement amount of the transmission part 2.

[0061] In this way, the driving assembly in the embodiment is driven by the control system instead of directly driving the booster by the clutch pedal in the prior art, so that the pedal force is relatively small, the user experience is better and more comfortable, and the rotation stroke of the clutch pedal is smaller than that in the prior art, the stroke occupation space of the clutch pedal is reduced, the structure is more compact, and the arrangement is more reasonable.

[0062] In a possible embodiment, a snap ring is arranged between the circumference of the transmission part 2 and the end of the piston cylinder 8 away from the first opening, to prevent the transmission part 2 and the piston cylinder 8 from sliding out or separating from the first cylinder part.

[0063] In a possible embodiment, the end of the transmission part 2 close to the piston cylinder 8 has the same diameter as the piston cylinder 8, and the first elastic member 3 is arranged between the second end of the second piston 4 and the end of the transmission part 2 close to the piston cylinder 8.

[0064] In the embodiment, the electrically controlled clutch booster further comprises a third elastic member 10 arranged in the second cylinder part, one end of the third elastic member 10 abutting against the side wall of the second cylinder part, and the other end abutting against the first piston 12, the third elastic member 10 acting on the first piston 12 to balance the pushing force of the push rod assembly on the first piston 12.

[0065] In a possible embodiment, the valve piece 6 needs to achieve the plugging of the second opening, and the valve piece 6 can be spherical or other shapes, and the specific structure of the valve piece 6 is not limited here.

[0066] The following content describes the working process of the electrically controlled clutch booster in the embodiment of the application in detail. As shown in Figure 1 In the non-working state of the clutch booster, the end of the push rod 13 protruding out of the end cover 7 is connected with a yoke, the push rod 13 assembly continuously receives the pushing force from the yoke, the third elastic member 10 is in a compressed state, the elastic force of the third elastic member 10 applied to the first piston 12 and the pushing force of the push rod 13 assembly cancel each other out, and at this time, the first piston 12 stays in the second cylinder part close to the first cylinder part.

[0067] When the clutch pedal is rotated, i.e., the clutch booster starts to work, the angle sensor senses the rotation of the clutch pedal, and the control system controls the driving assembly to drive the piston cylinder 8 to move in the axial direction of the first piston 12 in the first cylinder part, and before the valve piece simultaneously contacts the push rod base 11 and the first end of the second piston 4, the second piston 4 is always in the first position relative to the piston cylinder 8, the first opening is closed, the second opening is open, and the clutch booster is in the exhaust state; as shown in Figure 2 When the valve piece simultaneously contacts the push rod base 11 and the first end of the second piston 4, the first piston 12 is in the third position relative to the second piston 4, and the second opening is sealed by the valve piece 6.

[0068] AsFigure 3 As shown, after the valve plate is simultaneously extruded by the push rod base 11 and the second piston 4, the push rod base 11 starts to push the second piston 4 to move relative to the piston cylinder 8 in a direction away from the first opening, the first piston 12 is in the fourth position relative to the second piston 4, the first opening is open, the second opening is closed, the high-pressure gas in the intake cavity 15 flows to the inner cavity of the second cylinder portion, the pressure of the inner cavity of the second cylinder portion increases, the first piston 12 is pushed by the high-pressure gas to slide in the direction of the end cover 7, that is, the first piston 12 is assisted, then, under the pushing action of the high-pressure gas, the sliding speed of the first piston 12 in the second cylinder portion is greater than the sliding speed of the second piston 4 in the first cylinder portion, that is, while the first piston 12 and the second piston 4 move in the same direction towards the end cover 7, the first piston 12 moves relative to the second piston 4 in the opposite direction, at this time, the second spring member 5 is elongated, the force of the push rod base 11 acting on the valve plate 6 is synchronously reduced, the force of the valve plate 6 acting on the first end of the second piston 4 is synchronously reduced, at the same time, the first elastic member 3 is continuously compressed because the piston cylinder 8 continuously moves, the force of the first elastic member 3 acting on the second end of the second piston 4 continuously increases, when the force of the first elastic member 3 acting on the second end of the second piston 4 is greater than the force of the valve plate 6 acting on the first end of the second piston 4, the second piston 4 moves relative to the piston cylinder 8 in a direction towards the first opening, until the second piston 4 reaches the first position relative to the piston cylinder 8, at this time, the second piston 4 seals the first opening, the first opening is closed, and the position of the first piston 12 at this time is moved a certain distance relative to the position of the first piston 12 in the non-working state of the clutch booster, and the first piston 12 is closer to the end cover 7 at this time. The above process continues to circulate until the clutch pedal is rotated to the maximum rotatable angle, at this time, the push rod 13 is displaced to the maximum set distance, and the clutch is completely separated.

[0069] When the clutch pedal is reset, the transmission portion 2 and the piston cylinder 8 move in the first cylinder portion in a direction away from the second cylinder portion, the valve plate 6 is separated from the first end of the second piston 4 under the resetting force of the second elastic member 5, the first opening is in a closed state, and the second opening is open, at this time, the high-pressure gas in the inner cavity of the second cylinder portion is sequentially discharged to the external environment through the cavity structure, the exhaust passage 14 and the exhaust port, the gas pressure in the inner cavity of the second cylinder portion decreases, and the first piston 12 slides in the direction of the first cylinder portion under the pushing force of the push rod 13 assembly.

[0070] When the clutch pedal is stopped in the middle of the return, the piston cylinder 8 stops moving, when the air pressure in the inner cavity of the second cylinder part is too small and the pushing rod 13 assembly has a large pushing force, the pushing rod 13 assembly pushes the first piston 12 to move quickly in the direction of the first cylinder part, the pushing rod base 11 presses the valve plate 6 again, at this time, the valve plate 6 seals the second opening, the second opening is closed, at this time, the inner cavity of the second cylinder part stops exhausting, the first piston 12 is maintained in a fixed position, and a half clutch state is formed;When the clutch pedal continues to return, the driving assembly drives the piston cylinder 8 to continue to move, the valve plate 6 is separated from the first end of the second piston 4 again under the action of the return force of the second elastic element 5, and is returned to the state in which the clutch booster is not working.

[0071] In the embodiment of the present application, the driving assembly is in transmission connection with the piston cylinder, the angle sensor senses the rotation angle of the clutch pedal, and then indirectly controls the driving assembly to drive the piston cylinder to move through the control system. Since the clutch pedal is not directly connected with the clutch booster (piston cylinder) in the embodiment of the present application, but the rotation amount of the clutch pedal is sensed through the angle sensor, and the piston cylinder is driven through the driving assembly, the stroke of the clutch pedal is relatively short, which overcomes the defects that the pedal force is large and the clutch pedal occupies a large space in the prior art.

[0072] In the embodiment of the present application, the first piston and the second piston are arranged in the housing, a mechanical air inlet structure is arranged in the embodiment of the present application, that is, an air inlet cavity is arranged between the outer side wall of the second piston and the inner side wall of the first cylinder part, a first opening is arranged at the first end of the second piston, when the first opening is communicated with the inner cavity of the second cylinder part and high-pressure gas is introduced into the air inlet cavity, the clutch booster completes the air inlet action;An exhaust structure is also arranged in the embodiment of the present application, that is, a cavity structure is arranged in the second piston, the side walls of the piston cylinder and the second piston are provided with corresponding exhaust passages, and a second opening is arranged at the first end of the second piston, when the second opening is opened, the clutch booster completes the exhaust action;When the second opening is closed and the first opening is opened, the clutch booster is in the exhaust state, and when the second opening is opened and the first opening is closed, the clutch booster is in the air inlet state, the air inlet and exhaust actions of the clutch booster are completed through the mechanical air inlet and exhaust structure in the embodiment of the present application, and the action accuracy of the air inlet and exhaust is improved through the opening and closing control of the first opening and the second opening;When the clutch pedal is stopped in the middle of the return, the first opening and the second opening are closed at the same time, the first piston is maintained in the current position, and the clutch booster realizes the half clutch action.

[0073] In the embodiment of the present application, the angle sensor senses the rotating angle of the clutch pedal, the control system, the angle sensor and the driving assembly are electrically connected, and the control system can control and adjust the axial displacement of the driving assembly driving the piston cylinder according to the rotating angle of the clutch pedal.

[0074] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrically controlled clutch servomotor characterized by comprising: The application relates to a piston cylinder device, which comprises a shell (9), a piston cylinder (8), a first piston (12), a second piston (4), a driving assembly and a push rod assembly, wherein: The inside of the shell (9) is sequentially provided with a first cylinder barrel part and a second cylinder barrel part which are in communication in the axial direction, the piston cylinder (8) is slidably sleeved in the first cylinder barrel part, the first piston (12) is slidably sleeved in the second cylinder barrel part, and the side wall of the shell (9) is provided with an air inlet and an air outlet; The second piston (4) is slidably sleeved in the piston cylinder (8), and one end of the piston cylinder (8) close to the second cylinder barrel part is provided with a first opening, the first end of the second piston (4) extends out of the first opening, and the first opening is closed when the second piston (4) is in a first position relative to the piston cylinder (8); a first elastic element (3) is arranged between the second end of the second piston (4) and the piston cylinder (8); An air inlet cavity (15) is arranged between the outer side wall of the second piston (4) and the inner side wall of the first cylinder barrel part, the air inlet cavity (15) is in communication with the air inlet, and the air inlet cavity (15) is in communication with the inner cavity of the second cylinder barrel part when the first opening is open; The inside of the second piston (4) is provided with a cavity structure, the cavity structure is provided with a second opening, the second opening is arranged at the first end of the second piston (4), the side wall of the piston cylinder (8) and the second piston (4) is provided with a corresponding air outlet channel (14), the air outlet channel (14) is in communication with the cavity structure, and the air outlet channel (14) is in communication with the air outlet when the piston cylinder (8) is in a second position relative to the shell (9); The first end of the second piston (4) is provided with a valve piece (6) for plugging the second opening, and a second elastic element (5) is arranged between the piston cylinder (8) and the valve piece (6), the valve piece (6) is separated from the second opening in a normal state; The push rod assembly is connected with the first piston (12), the push rod assembly extrudes the valve piece (6) to the second opening so that the valve piece (6) seals the second opening when the first piston (12) is in a third position relative to the second piston (4), and the push rod assembly extrudes the second piston (4) and the first elastic element (3) so that the second piston (4) is separated from the first opening and the first opening is open when the first piston (12) is in a fourth position relative to the second piston (4); The driving assembly is in transmission connection with the piston cylinder (8) and is used for driving the piston cylinder (8) to displace in the axial direction.

2. The electrically controlled clutch servomotor according to claim 1, characterized by Further comprising an angle sensor and a control system, wherein, The angle sensor is used for sensing the rotating angle of a clutch pedal; The control system is in electrical connection with the angle sensor and the driving assembly, and the control system is used for controlling the driving assembly to drive the axial displacement amount of the piston cylinder (8) according to the rotating angle of the clutch pedal.

3. The electrically controlled clutch servomotor according to claim 2, characterized by The displacement sensor is used to obtain the axial displacement of the piston cylinder (8), and is electrically connected with the control system, which is used to control the driving assembly to start and stop according to the sensed displacement of the displacement sensor.

4. The electrically controlled clutch servomotor according to claim 3, characterized by The driving assembly comprises a driving part (1) and a transmission part (2), the driving part (1) is connected with the transmission part (2), the transmission part (2) is slidably sleeved in the first cylinder part and abuts against one end of the piston cylinder (8) away from the second cylinder part, so that the driving part (1) drives the piston cylinder (8) to slide along the inner wall of the first cylinder part through the transmission part (2); The displacement sensor obtains the axial displacement of the piston cylinder (8) by sensing the axial displacement of the transmission part (2). The first elastic member (3) is arranged between the second end of the second piston (4) and the transmission part (2).

5. The electrically controlled clutch servomotor according to any one of claims 1 to 4, characterized by The inner diameter of the first opening is smaller than the inner cavity diameter of the piston cylinder (8), and the outer periphery of the second piston (4) is circumferentially provided with a first annular protrusion, the outer diameter of the first annular protrusion is smaller than the inner cavity diameter of the piston cylinder (8) and larger than the inner diameter of the first opening.

6. The electrically controlled clutch servomotor according to claim 5, characterized by The outer periphery of the second piston (4) is further provided with a second annular protrusion and a third annular protrusion, the second annular protrusion and the third annular protrusion are circumferentially arranged on the second piston (4), and the second annular protrusion and the third annular protrusion are in close contact with the inner wall of the piston cylinder (8); the second annular protrusion is arranged in a spaced manner with the first annular protrusion to form the air inlet cavity (15) therebetween; the third annular protrusion is arranged in a spaced manner with the second annular protrusion to form part of the exhaust passage (14) therebetween.

7. The electrically controlled clutch servomotor according to claim 1, characterized by The push rod assembly comprises a push rod base (11) and a push rod (13), the push rod base (11) is penetratingly and fixedly connected with the first piston (12); one end of the push rod base (11) corresponds to the valve plate (6), and the other end is connected with the push rod (13).

8. The electrically controlled clutch servomotor according to claim 7, characterized by Further comprising an end cover (7), the end cover (7) is fixedly connected to one end of the second cylinder part away from the first cylinder part; the push rod (13) penetrates the end cover (7) and partially extends out of the end cover (7).

9. The electrically controlled clutch servomotor of claim 1, wherein Further comprising a third elastic member (10), the third elastic member (10) is arranged in the second cylinder part, and the third elastic member (10) acts on the first piston (12) to balance the pushing force of the push rod assembly on the first piston (12).

10. A vehicle characterized by comprising: The clutch and the electrically controlled clutch booster are provided, and the electrically controlled clutch booster is the electrically controlled clutch booster according to any one of claims 1-9.

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