A clutch slave cylinder for an automobile

Abstract

This application relates to the technical field of automotive clutches, and provides an automotive clutch slave cylinder. The automotive clutch slave cylinder includes a pump body, a normal piston, and a spare piston. The normal piston is movably disposed inside the pump body along the axial direction of the pump body; the spare piston is detachably connected to the inner wall of one end of the pump body; the spare piston can move along the axial direction of the pump body; wherein, the spare piston is used to disconnect the connection with the inner wall of the pump body when the normal piston leaks, and move along the axial direction of the pump body towards the other end of the pump body, so as to push the normal piston to move under the action of hydraulic pressure. The automotive clutch slave cylinder provided by this application improves the reliability of the automotive clutch slave cylinder through redundant setting of the piston, wins repair time for the sudden failure of the clutch, and improves the safety during the driving process of the vehicle.

Description

Technical Field

[0001] This application relates to the technical field of automotive clutches, and particularly to an automotive clutch slave cylinder. Background Art

[0002] An automotive clutch is a device that realizes the transmission or cut-off of engine power by controlling the contact or separation between the pressure plate and the driven plate. An automotive clutch slave cylinder is a component that realizes the separation and engagement of the clutch through hydraulic transmission.

[0003] In the automotive clutch slave cylinder in the related art, under the conditions of frequent use and aging of the sealing parts, the piston of the automotive clutch slave cylinder will leak during driving, resulting in insufficient pressure in the hydraulic system, thereby causing the clutch to fail to disengage and the vehicle to be unable to shift gears normally, affecting the driving safety of the vehicle. Summary of the Invention

[0004] An embodiment of this application provides an automotive clutch slave cylinder, which can improve the technical problem that the automotive clutch slave cylinder in the related art leaks during driving, resulting in the vehicle being unable to shift gears normally.

[0005] In a first aspect, an embodiment of this application provides an automotive clutch slave cylinder, including:

[0006] A pump body;

[0007] A common piston, which is movably arranged inside the pump body along the axial direction of the pump body; and

[0008] A spare piston, which is detachably connected to the inner wall of one end of the pump body; the spare piston can move along the axial direction of the pump body;

[0009] Wherein, when the common piston leaks, the spare piston disconnects the connection with the inner wall of the pump body and moves along the axial direction of the pump body towards the other end of the pump body to push the common piston to move under the action of hydraulic pressure.

[0010] The above technical solution in the embodiment of this application has at least the following technical effects:

[0011] In the embodiment of the present application, the slave cylinder of the automotive clutch drives the push rod through the common piston to push the clutch pressure plate, so as to disengage the clutch. When the common piston has internal leakage, the spare piston is released, and the spare piston moves to abut against the common piston, and the hydraulic pressure in the pump body acts on the spare piston, so that the spare piston pushes the common piston to move. With such a setting, the reliability of the slave cylinder of the automotive clutch is improved by the redundant setting of the piston, obtaining repair time for the sudden failure of the clutch, improving the safety during the driving of the vehicle, effectively ensuring the safety of the driver, and reducing the repair time and cost of the vehicle.

[0012] In some embodiments, the common piston, the spare piston and the inner wall of the pump body jointly form a first space; the spare piston and the inner wall of the pump body jointly form a second space; further included are:

[0013] A first oil inlet, which is arranged on the pump body; the output end of the first oil inlet is connected to the first space; and

[0014] A second oil inlet, which is arranged on the pump body; the output end of the second oil inlet is connected to the second space.

[0015] In some embodiments, further included are:

[0016] A reversing valve, which has an input end, a first output end and a second output end; the first output end is connected to the input end of the first oil inlet; the second output end is connected to the input end of the second oil inlet; and

[0017] A main oil pipe, the output end of which is connected to the input end of the reversing valve.

[0018] In some embodiments, a manual adjustment switch is further included, which is arranged on the vehicle operation console; the manual adjustment switch is electrically connected to the reversing valve; the manual adjustment switch is used to control the reversing valve.

[0019] In some embodiments, a leakage detection device is further included, which is arranged on the common piston; the leakage detection device is electrically connected to the reversing valve; the leakage detection device is used to send a signal to make the reversing valve reverse when the common piston leaks, so that the fluid enters the second space through the second oil inlet to push out the spare piston.

[0020] In some embodiments, an adsorption device is further included, which is arranged at one end of the pump body; the adsorption device is used to adsorb the spare piston to the inner wall at one end of the pump body.

[0021] In some embodiments, the common piston and the inner wall of the pump body together form a third space; the automotive clutch slave cylinder further includes:

[0022] An oil drain port, which is arranged at the other end of the pump body; the oil drain port communicates with the third space;

[0023] A check valve, the input end of which is connected to the output end of the oil drain port; and

[0024] An oil drain pipe, one end of which is connected to the output end of the check valve; the other end of the oil drain pipe is connected to the input end of the second oil inlet.

[0025] In some embodiments, it further includes a displacement sensor, which is arranged on the inner wall of the pump body; the displacement sensor is located in the second space; the displacement sensor is electrically connected to the reversing valve; the displacement sensor is used to detect the displacement distance of the standby piston, so as to obtain the fluid volume in the third space.

[0026] In some embodiments, it further includes:

[0027] A piston rod, which is arranged at the end of the common piston far from the standby piston; at least part of the piston rod protrudes from the pump body;

[0028] A dust cover, which is arranged at one end of the pump body; the dust cover is sleeved on the part of the piston rod protruding from the pump body; and

[0029] An oil blocking ring, which is arranged at the end of the dust cover far from the pump body; the inner wall of the oil blocking ring slides frictionally with the outer wall of the piston rod.

[0030] In some embodiments, it further includes a return spring, one end of which is arranged at the end of the common piston far from the standby piston; the other end of the return spring abuts against the inner wall of the other end of the pump body; the return spring is used to push the common piston so that the common piston moves towards one end of the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of the automotive clutch slave cylinder provided by the embodiment of the present application;

[0033] Figure 2 This is a schematic structural diagram of another perspective of the automotive clutch slave cylinder provided by the embodiments of the present application;

[0034] Figure 3 This is a sectional view of the automotive clutch slave cylinder provided by the embodiments of the present application;

[0035] Figure 4 is Figure 3 A schematic structural diagram of the common piston and the spare piston of the automotive clutch slave cylinder shown in the figure.

[0036] Among them, the reference numerals in the figure are as follows:

[0037] 1000, automotive clutch slave cylinder; 10, pump body; 101, first oil inlet; 102, second oil inlet; 103, first space; 104, second space; 105, third space; 20, common piston; 30, spare piston; 40, reversing valve; 50, main oil pipe; 60, manual adjustment switch; 70, leakage detection device; 80, adsorption device; 90, oil drain port; 100, check valve; 110, oil drain pipe; 120, displacement sensor; 130, piston rod; 140, dust cover; 150, oil blocking ring; 160, return spring; 170, guide rod; 180, first moving groove; 190, second moving groove; 200, air exchange port. Detailed implementation manners

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and do not limit the present application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0041] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0043] In the present application, "and / or" is merely an associative relationship describing associated objects, indicating that three relationships may exist; for example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0044] It should be noted that in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to give examples, illustrations, or explanations. Any embodiment or design solution described as "in some embodiments", "exemplarily", "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Precisely, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present relevant concepts in a specific manner, meaning that the specific features, structures, or characteristics described in combination with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0045] An automotive clutch is a device that realizes the transmission or cut-off of engine power by controlling the contact or separation between the pressure plate and the driven plate. The slave cylinder of an automotive clutch is a component that realizes the separation and engagement of the clutch through hydraulic transmission.

[0046] In the slave cylinder of an automotive clutch in the related art, in the case of frequent use and aging of the seal, the piston of the slave cylinder of the automotive clutch will leak during driving, resulting in insufficient pressure in the hydraulic system, thereby causing the clutch to be unable to separate and the vehicle to be unable to shift gears normally, affecting the safety of vehicle driving.

[0047] Based on this, in order to improve the technical problem in the related art that the vehicle cannot shift gears normally due to leakage of the automotive clutch slave cylinder during driving, the embodiments of the present application provide the following solutions.

[0048] Please refer to Figure 1 and Figure 3 , the embodiments of the present application provide an automotive clutch slave cylinder 1000. The automotive clutch slave cylinder 1000 includes a pump body 10, a normal piston 20 and a spare piston 30. The normal piston 20 is movably disposed inside the pump body 10 along the axial direction of the pump body 10; the spare piston 30 is detachably connected to the inner wall of one end of the pump body 10; the spare piston 30 can move along the axial direction of the pump body 10; wherein, the spare piston 30 is used to disconnect the connection with the inner wall of the pump body 10 when the normal piston 20 leaks, and move along the axial direction of the pump body 10 towards the other end of the pump body 10, so as to push the normal piston 20 to move under the action of hydraulic pressure.

[0049] It can be understood that the pump body 10 is a component used as an installation base, providing structural support and bearing the internal hydraulic pressure. The pump body 10 has a hollow cavity. The pump body 10 can be made of metal material, or can be made of plastic to reduce the weight of the pump body 10, but not limited thereto. The normal piston 20 is a component used to move along the axial direction of the pump body 10 under the push of hydraulic oil, convert hydraulic energy into mechanical thrust, and drive the push rod to push the clutch pressure plate. The piston is a cylinder and can be made of the same material as the pump body 10. At least one annular sealing ring made of rubber or polyurethane is sleeved on the normal piston 20 to prevent hydraulic oil leakage, maintain the system pressure, and ensure the hydraulic transmission efficiency. The spare piston 30 is a component used to maintain the function of the automotive clutch slave cylinder 1000 when the normal piston 20 has internal leakage. The spare piston 30 can have the same structure as the normal piston 20. The spare piston 30 can be adsorbed on the inner wall of one end of the pump body 10 by a magnet, or a buckle can be provided on the inner wall of the pump body 10 to snap the spare piston 30 on the inner wall of one end of the pump body 10, but not limited thereto.

[0050] As can be seen from the above, for the automotive clutch slave cylinder 1000 provided by the embodiments of the present application, the normal piston 20 drives the push rod to push the clutch pressure plate to separate the clutch. When the normal piston 20 has internal leakage, the spare piston 30 is released, so that the spare piston 30 moves to abut against the normal piston 20, and the hydraulic pressure in the pump body 10 acts on the spare piston 30, so that the spare piston 30 pushes the normal piston 20 to move. With such a setting, the reliability of the automotive clutch slave cylinder 1000 is improved by the redundant setting of the piston, time for maintenance is gained for the sudden failure of the clutch, the safety during the driving of the vehicle is improved, the safety of the driver is effectively guaranteed, and the maintenance time and cost of the vehicle are reduced.

[0051] In some embodiments, please refer to Figures 1 to 3 , the inner wall of the common piston 20, the spare piston 30 and the pump body 10 together form a first space 103; the inner wall of the spare piston 30 and the pump body 10 together form a second space 104; the automotive clutch slave cylinder 1000 further includes a first oil inlet 101 and a second oil inlet 102, the first oil inlet 101 is provided on the pump body 10; the output end of the first oil inlet 101 is connected to the first space 103; the second oil inlet 102 is provided on the pump body 10; the output end of the second oil inlet 102 is connected to the second space 104.

[0052] It can be understood that the end face of the common piston 20 facing the spare piston 30, the end face of the spare piston 30 facing the common piston 20 and the arc side face of the inner wall of the pump body 10 together form the first space 103. By injecting oil into the first space 103 through the first oil inlet 101, the common piston 20 can be pushed to move. The end face of the spare piston 30 far from the common piston 20, the arc side face of the inner wall of the pump body 10 and the end face of one end of the inner wall of the pump body 10 together form the second space 104. By injecting oil into the second space 104 through the second oil inlet 102, the spare piston 30 can be pushed to move to be spaced from the inner wall of the pump body 10 and move towards the other end of the pump body 10.

[0053] With such a setting, by injecting oil into the first space 103 through the first oil inlet 101, the common piston 20 can move along the axis direction of the pump body 10 without moving the spare piston 30; by injecting oil into the second space 104 through the second oil inlet 102, the spare piston 30 moves towards the common piston 20 until it abuts against the common piston 20 and pushes the common piston 20 to move. Before the spare piston 30 abuts against the common piston 20, the common piston 20 will not move relative to the pump body 10. In this way, the common piston 20 and the spare piston 30 can be independently controlled, the wear of the spare piston 30 can be reduced, the service life of the spare piston 30 can be extended, the maintenance frequency of the automotive clutch slave cylinder 1000 can be reduced, the maintenance cost can be reduced, and the reliability of the automotive clutch slave cylinder 1000 can be improved.

[0054] Optionally, in some embodiments, please refer to Figures 1 to 3 , the automotive clutch slave cylinder 1000 further includes a reversing valve 40 and a main oil pipe 50. The reversing valve 40 has an input end, a first output end and a second output end; the first output end is connected to the input end of the first oil inlet 101; the second output end is connected to the input end of the second oil inlet 102; the output end of the main oil pipe 50 is connected to the input end of the reversing valve 40.

[0055] It can be understood that the reversing valve 40 is a component that controls the flow direction of the fluid by changing the position of the valve core. The reversing valve 40 can be an electromagnetic reversing valve 40, which moves the valve core by controlling the on and off of the electromagnet; it can also be a manual reversing valve 40, which pulls the handle of the reversing valve 40 through a traction line to make the manual reversing valve 40 perform an action, but it is not limited to this. The main oil pipe 50 is a component used to connect the clutch master cylinder and transmit fluid. The main oil pipe 50 can be a steel pipe or a high-pressure rubber pipe, but it is not limited to this.

[0056] With such arrangement, the flow direction of the fluid is controlled by the reversing valve 40, so that the fluid input by the clutch master pump flows into the first space 103 or the second space 104, thereby controlling the movement of the normal piston 20 or the spare piston 30. This can optimize the utilization of the hydraulic system, control the movement of the normal piston 20 or the spare piston 30 according to actual needs, improve the utilization efficiency of the hydraulic system, reduce energy loss, effectively reduce fluid leakage, and improve the overall efficiency of the system.

[0057] Optionally, see Figure 1 and Figure 2 The automobile clutch cylinder 1000 further includes a manual adjustment switch 60 , which is disposed on the automobile operating console; the manual adjustment switch 60 is electrically connected to the reversing valve 40 ; and the manual adjustment switch 60 is used to control the reversing valve 40 .

[0058] It can be understood that the manual adjustment switch 60 is a device for sending a signal to the reversing valve 40. For example, when the reversing valve 40 adopts an electromagnetic reversing valve 40, the manual adjustment switch 60 may include a knob switch and a wire, which is electrically connected to the electromagnetic reversing valve 40 through the wire, and the knob switch is turned to different gears to control the valve core of the electromagnetic reversing valve 40 to move to different positions; or when the reversing valve 40 adopts a manual reversing valve 40, the manual adjustment switch 60 may adopt a lever and a connecting rope, by connecting the connecting rope to the manual reversing valve 40, the lever is moved to pull the manual reversing valve 40, and then the valve core of the reversing valve 40 is controlled to change direction, but it is not limited to this.

[0059] With such a setting, by manually adjusting the switch 60, the driver can actively control the reversing valve 40 to reverse, so that the fluid enters the first space 103 or the second space 104. In this way, when there is a long dead stroke due to the leakage of the automotive clutch slave cylinder 1000, the driver can step on the clutch pedal to make the fluid enter the first space 103, hold the clutch pedal and control the reversing valve 40 to reverse through the manual adjustment switch 60. Stepping on the clutch pedal again will make the fluid enter the second space 104, pushing the spare piston 30. The presence of fluid in the first space 103 prevents the spare piston 30 from abutting against the normal piston 20, shortening the strokes of the normal piston 20 and the spare piston 30, improving the driving controllability and comfort, effectively strengthening the emergency protection function of the automotive clutch slave cylinder 1000, enhancing driving safety, temporarily restoring the function of the clutch without immediately replacing the clutch slave cylinder, and reducing the maintenance cost and time.

[0060] In some embodiments, referring to Figures 1 to 3 , the automotive clutch slave cylinder 1000 further includes a leakage detection device 70. The leakage detection device 70 is disposed on the normal piston 20; the leakage detection device 70 is electrically connected to the reversing valve 40; the leakage detection device 70 is configured to send a signal to reverse the reversing valve 40 when the normal piston 20 leaks, so that the fluid enters the second space 104 through the second oil inlet 102 to push out the spare piston 30.

[0061] It can be understood that the leakage detection device 70 is used to detect whether the automotive clutch slave cylinder 1000 leaks. The leakage of the automotive clutch slave cylinder 1000 may be due to leakage of the pump body 10 or internal leakage of the common piston 20. The leakage detection device 70 may include a camera to collect images inside and outside the pump body 10, and use image processing technology to detect whether there are liquid beads formed by the fluid inside one end of the pump body 10 on the outer surface and joints of the pump body 10 and on the inner wall at the other end of the pump body 10. If there are liquid beads on the outer surface or joints of the pump body 10, it can be determined that the outer wall of the pump body 10 leaks. If there are liquid beads on the inner wall at the other end of the pump body 10, it can be determined that the common piston 20 leaks. Otherwise, the pump body 10 does not leak. Or the leakage detection device 70 may include a microphone. When the automotive clutch slave cylinder 1000 leaks, it will produce a whistling sound, a low-frequency vibration sound or a sound of bubble bursting, which is significantly different from the sound with stable frequency during normal operation. The sound inside and outside the pump body 10 can be collected by the microphone, and the collected sound segment is input into the leakage judgment model to determine whether there is leakage inside or outside the pump body 10. Among them, the leakage judgment model is obtained through machine learning training using the working data of multiple automotive clutch slave cylinders 1000. The working data used for training all include the working audio of the automotive clutch slave cylinder 1000 and the corresponding leakage situation, but are not limited thereto. The leakage detection device 70 may further include a buzzer or a warning light to prompt the driver that the automotive clutch slave cylinder 1000 leaks.

[0062] With such a setting, the leakage detection device 70 detects whether the automotive clutch slave cylinder 1000 leaks. When the automotive clutch slave cylinder 1000 leaks, a signal is sent to the reversing valve 40 to make the reversing valve 40 perform commutation, introduce the fluid into the second space 104, and push the standby piston 30 out to abut against the common piston 20, so as to prevent the fluid from leaking internally through the common piston 20 and then leaking to the outside of the pump body 10. It can monitor the leakage situation of the automotive clutch slave cylinder 1000 in real time and respond automatically, take emergency measures, maintain the pressure of the hydraulic system, ensure that the automotive clutch slave cylinder 1000 can work normally, improve driving safety, reduce losses caused by clutch failure of the vehicle, and extend the service life of the automotive clutch slave cylinder 1000.

[0063] Optionally, in some embodiments, please refer to Figures 1 to 3 , the automotive clutch slave cylinder 1000 further includes an adsorption device 80. The adsorption device 80 is arranged at one end of the pump body 10; the adsorption device 80 is used to adsorb the standby piston 30 to the inner wall at one end of the pump body 10.

[0064] It can be understood that the adsorption device 80 is a device for detachably connecting the spare piston 30 to the inner wall of one end of the pump body 10. For example, the adsorption device 80 may include an electromagnet. The spare piston 30 is made of a ferromagnetic material or includes an iron core. By arranging the electromagnet on the outer wall of one end of the pump body 10, the electromagnet is electrically connected to the reversing valve 40. When the electromagnet is powered on, a magnetic force is generated to adsorb the spare piston 30. When the spool of the reversing valve 40 moves to introduce fluid into the second space 104, the reversing valve 40 sends a signal to the electromagnet to cut off the power supply to release the spare piston 30. Or the adsorption device 80 may include a plurality of elastic members and a plurality of top blocks. By opening a plurality of grooves on the inner wall of one end of the pump body 10, one end of each of the plurality of elastic members is correspondingly arranged at the bottom of the groove. The length direction of the elastic member is the same as the depth direction of the groove. The plurality of top blocks are correspondingly arranged at the other end of the plurality of elastic members. At least a part of the top block protrudes from the groove. A plurality of card slots are opened on the spare piston 30. The number of card slots is the same as the number of grooves. When one end of the spare piston 30 abuts against the inner wall of one end of the pump body 10, the plurality of elastic members are compressed so that one end of each of the plurality of top blocks away from the elastic member is correspondingly clamped in the card slot, thereby fixing the spare piston 30. When the spool of the reversing valve 40 moves to introduce fluid into the second space 104, as the pressure in the second space 104 increases, the spare piston 30 compresses the plurality of elastic members, and the fluid can push out the spare piston 30, but it is not limited thereto.

[0065] With such an arrangement, the spare piston 30 is adsorbed on the inner wall of one end of the pump body 10 by the adsorption device 80. When the normal piston 20 has internal leakage, the spare piston 30 is released to activate this emergency measure, effectively avoiding mis-triggering and affecting the normal use of the automotive clutch, improving the stability and reliability of the automotive clutch slave cylinder 1000, enhancing the safety of vehicle driving, prolonging the service life of the spare piston 30, reducing the number of times of maintaining the spare piston 30, and reducing the cost of maintaining the spare piston 30.

[0066] Optionally, please refer to Figure 3 , the normal piston 20 and the inner wall of the pump body 10 together form a third space 105; the automotive clutch slave cylinder 1000 further includes an oil drain port 90, a check valve 100, and an oil drain pipe 110. The oil drain port 90 is arranged at the other end of the pump body 10; the oil drain port 90 communicates with the third space 105; the input end of the check valve 100 is connected to the output end of the oil drain port 90; one end of the oil drain pipe 110 is connected to the output end of the check valve 100; the other end of the oil drain pipe 110 is connected to the input end of the second oil inlet 102.

[0067] It can be understood that the end face of the end of the common piston 20 away from the spare piston 30, the arc-shaped side face of the inner wall of the pump body 10, and the end face of the other end together form a third space 105. The third space 105 is a low-pressure chamber relative to the first space 103. The oil drain port 90 is a component for discharging the fluid leaked into the third space 105. The oil drain port 90 is arranged on the pump body 10 on the side close to the ground along the gravity direction. The automotive clutch slave cylinder 1000 further includes a ventilation port 200. The ventilation port 200 is arranged on the pump body 10 on the side opposite to the oil drain port 90 along the gravity direction. The fluid in the third space 105 is discharged through the oil drain port 90, and the pressure in the third space 105 is balanced through the ventilation port 200, enabling the common piston 20 and the spare piston 30 to reset. The one-way valve 100 is a valve that allows the fluid to pass through only in a preset one-way direction. The one-way valve 100 is arranged between the oil drain port 90 and the oil drain pipe 110, and only allows the fluid in the third space 105 to be discharged and cannot flow back into the third space 105. The oil drain pipe 110 is a pipe for connecting the output end of the one-way valve 100 and the input end of the second oil inlet 102. The oil drain pipe 110 can be integrally formed on the pump body 10, or an external steel pipe or plastic pipe can be used, but it is not limited thereto.

[0068] With such a setting, by arranging the oil drain port 90 at one end of the pump body 10, connecting the input end of the one-way valve 100 to the output end of the oil drain port 90, connecting one end of the oil drain pipe 110 to the output end of the one-way valve 100, and connecting the other end of the oil drain pipe 110 to the input end of the second oil inlet 102, when internal leakage occurs in the common piston 20, the fluid in the first space 103 leaks into the third space 105, and the fluid in the third space 105 can be discharged into the second space 104 as the common piston 20 moves. In this way, it effectively avoids the situation where when internal leakage occurs in the automotive clutch slave cylinder 1000, the fluid stays in the first space 103 and the third space 105, resulting in insufficient hydraulic oil and insufficient pressure in the automotive clutch system, effectively improving the stability of the automotive clutch slave cylinder 1000, enhancing the fault response ability of the automotive clutch slave cylinder 1000, improving driving safety, and extending the service life of the automotive clutch system.

[0069] In some embodiments, please refer to Figure 3 , the automotive clutch slave cylinder 1000 further includes a displacement sensor 120. The displacement sensor 120 is arranged on the inner wall of the pump body 10; the displacement sensor 120 is located in the second space 104; the displacement sensor 120 is electrically connected to the reversing valve 40; the displacement sensor 120 is used to detect the displacement distance of the spare piston 30, and thus obtain the fluid volume in the third space 105.

[0070] It can be understood that the displacement sensor 120 is a sensor for detecting the displacement distance of the spare piston 30. When internal leakage occurs in the common piston 20, the fluid enters the third space 105 from the first space 103. The common piston 20 continues to move, and the fluid in the third space 105 is introduced into the second space 104 through the drain pipe 110. The fluid entering the second space 104 pushes the spare piston 30 to the other end of the pump body 10. According to the displacement distance of the spare piston 30, the volume of the fluid in the third space 105 can be calculated. When the volume of the fluid in the third space 105 reaches a preset value, a signal is sent to the reversing valve 40 to cause the reversing valve 40 to change the fluid flow direction to enter the second space 104 and push the spare piston 30. The displacement sensor 120 can be a resistive displacement sensor 120 or an optoelectronic displacement sensor 120, but is not limited thereto.

[0071] With such a setting, when internal leakage occurs in the automotive clutch slave cylinder 1000, the fluid enters the third space 105 from the first space 103 through the common piston 20. The common piston 20 continues to move and discharges the fluid in the third space 105 into the second space 104 through the drain pipe 110. When the displacement sensor 120 detects that the moving distance of the spare piston 30 reaches the preset value, it means that the volume of the fluid leaking from the first space 103 to the third space 105 reaches the preset value. The displacement sensor 120 sends a signal to the reversing valve 40 to move the valve core of the reversing valve 40, thereby causing the fluid to turn into the second space 104 and push the spare piston 30 to move, so as to prevent the fluid from continuing to enter the third space 105, prevent the automotive clutch slave cylinder 1000 from continuously leaking and causing clutch failure, return the leaked fluid to the hydraulic system for reuse, reduce the loss when the automotive clutch slave cylinder 1000 fails, reduce the maintenance cost of the automotive clutch slave cylinder 1000, and improve the response speed of the spare piston 30 when the automotive clutch slave cylinder 1000 fails, improving the reliability and safety of the automotive clutch slave cylinder 1000.

[0072] In some embodiments, please refer to Figures 1 to 3 , the automotive clutch slave cylinder 1000 further includes a piston rod 130, a dust cover 140, and an oil blocking ring 150. The piston rod 130 is disposed at one end of the common piston 20 away from the spare piston 30; at least a part of the piston rod 130 protrudes from the pump body 10; the dust cover 140 is disposed at one end of the pump body 10; the dust cover 140 is sleeved on the part of the piston rod 130 protruding from the pump body 10; the dust cover 140 is disposed at one end of the dust cover 140 away from the pump body 10; the inner wall of the oil blocking ring 150 slides and rubs against the outer wall of the piston rod 130.

[0073] It can be understood that the piston rod 130 is a structure for connecting the common piston 20 and the clutch push rod, and the piston rod 130 can be made of the same material as the common piston 20. The dust cover 140 is a component for covering the part of the piston rod 130 protruding from the pump body 10 to prevent sundries from adhering to the surface of the piston rod 130 and affecting the movement of the piston rod 130. The dust cover 140 can expand and contract along the axial direction of the pump body 10. The dust cover 140 can be made of rubber material or plastic material, but is not limited thereto. The oil blocking ring 150 is fixedly arranged at one end of the dust cover 140 away from the pump body 10, and the oil blocking ring 150 can be made of the same material as the dust cover 140. The oil blocking ring 150 is used to block the leaked fluid from flowing along the piston rod 130 to the clutch when the automotive clutch slave cylinder 1000 leaks.

[0074] With such an arrangement, by sleeving the dust cover 140 on the piston rod 130 and arranging the oil blocking ring 150 at one end of the dust cover 140 away from the pump body 10, when the automotive clutch slave cylinder 1000 leaks, it can prevent the power transmission of the clutch from being incomplete due to the fluid flowing along the piston rod 130 to the clutch, effectively improving the safety of vehicle driving. And the piston rod 130 can be lubricated by a small amount of leaked fluid, reducing the friction between the piston rod 130 and the pump body 10 and enhancing the driving experience of the vehicle.

[0075] Optionally, please refer to Figure 4 , a first moving groove 180 is formed along the axis of the common piston 20; a second moving groove 190 is formed along the axial direction of the piston rod 130; the automotive clutch slave cylinder 1000 further includes a guide rod 170, one end of the guide rod 170 is connected to one end of the standby piston 30 facing the common piston 20; the guide rod 170 can move along the axial direction of the common piston 20; at least a part of the guide rod 170 is inserted into the first moving groove 180; the outer wall of the guide rod 170 slides frictionally with the inner wall of the moving groove.

[0076] It can be understood that the guide rod 170 is a component for moving the standby piston 30 in a preset direction and can be made of the same material as the common piston 20. One end of the guide rod 170 can be provided with a thread. By forming a threaded hole at one end of the standby piston 30 facing the common piston 20, the guide rod 170 is threadedly connected to the standby piston 30; or one end of the guide rod 170 can be welded to the standby piston 30, but is not limited thereto. The guide rod 170 can move from the first moving groove 180 into the second moving groove 190.

[0077] With such a setting, one end of the guide rod 170 is connected to the spare piston 30, and the guide rod 170 can move into the moving groove along the length direction of the piston rod 130. The moving direction of the spare piston 30 can be determined, preventing the spare piston 30 from tilting or flipping inside the pump body 10, thereby avoiding internal leakage of the spare piston 30, improving the reliability of the spare piston 30, effectively enhancing the safety of the automotive clutch slave cylinder 1000, reducing the maintenance frequency of the vehicle, and decreasing the cost required for maintenance.

[0078] In some embodiments, referring to FIG. 3, the automotive clutch slave cylinder 1000 further includes a return spring 160. One end of the return spring 160 is disposed at the end of the normal piston 20 away from the spare piston 30; the other end of the return spring 160 abuts against the inner wall of the other end of the pump body 10; the return spring 160 is used to push the normal piston 20 so that the normal piston 20 moves towards one end of the pump body 10.

[0079] It can be understood that the return spring 160 is disposed inside the pump body 10 and is used to return the normal piston 20 or the spare piston 30 to the end of the pump body 10 away from the dust cover 140. The return spring 160 can be made of carbon spring steel or silicon manganese spring steel, but is not limited thereto.

[0080] With such a setting, by disposing the return spring 160 inside the pump body 10 and at the end of the normal piston 20 away from the spare piston 30, when the clutch is depressed, the normal piston 20 moves towards the dust cover 140, compressing the return spring 160. After the clutch is released, the return spring 160 expands and contracts to push the normal piston 20 back to one end of the pump body 10, which is beneficial to restoring the pressure of the hydraulic system, ensuring safety during vehicle driving. Moreover, since the return spring 160 is located inside the pump body 10, it is not likely to come into contact with impurities and be hindered from expanding and contracting, improving the reliability of the automotive clutch slave cylinder 1000 and reducing the time and cost for maintaining the automotive clutch slave cylinder 1000.

[0081] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A clutch cylinder for an automobile, characterized in that: include: Pump body; A common piston, wherein the common piston is movably disposed inside the pump body along the axial direction of the pump body; as well as A spare piston, the spare piston being detachably connected to the inner wall of one end of the pump body; the spare piston being able to move along the axial direction of the pump body; Wherein, the spare piston is used to disconnect from the inner wall of the pump body and move along the axial direction of the pump body toward the other end of the pump body when the common piston leaks, so as to push the common piston to move under the action of hydraulic pressure; The side of the common piston facing the spare piston, the side of the spare piston facing the common piston and the inner wall of the pump body together form a first space; the side of the spare piston away from the common piston and the inner wall of the pump body together form a second space; the automobile clutch sub-cylinder also includes: A first oil inlet, which is disposed on the pump body; an output end of the first oil inlet is connected to the first space; a second oil inlet, the second oil inlet being arranged on the pump body; an output end of the second oil inlet being connected to the second space; The side of the common piston away from the spare piston and the inner wall of the pump body together form a third space; the automobile clutch cylinder also includes: An oil discharge port, the oil discharge port being arranged at the other end of the pump body; the oil discharge port being connected to the third space; a one-way valve, wherein an input end of the one-way valve is connected to an output end of the oil discharge port; an oil drain pipe, one end of which is connected to the output end of the one-way valve; and the other end of which is connected to the input end of the second oil inlet; a reversing valve, the reversing valve having an input end, a first output end and a second output end; the first output end is connected to the input end of the first oil inlet; the second output end is connected to the input end of the second oil inlet; and A main oil pipe, wherein the output end of the main oil pipe is connected to the input end of the reversing valve.

2. The automobile clutch slave cylinder according to claim 1, characterized in that: It also includes a manual adjustment switch, which is arranged on the automobile operating console; the manual adjustment switch is electrically connected to the reversing valve; and the manual adjustment switch is used to control the reversing valve.

3. The automobile clutch slave cylinder according to claim 1, characterized in that: It also includes a leakage detection device, which is arranged on the common piston; the leakage detection device is electrically connected to the reversing valve; the leakage detection device is used to send a signal to make the reversing valve reverse when the common piston leaks, so that the fluid enters the second space through the second oil inlet to push out the spare piston.

4. The automobile clutch slave cylinder according to claim 1, characterized in that: It also includes an adsorption device, which is arranged at one end of the pump body; the adsorption device is used to adsorb the spare piston to the inner wall of one end of the pump body.

5. The automobile clutch slave cylinder according to claim 1, characterized in that: It also includes a displacement sensor, which is arranged on the inner wall of the pump body; the displacement sensor is located in the second space; the displacement sensor is electrically connected to the reversing valve; the displacement sensor is used to detect the displacement distance of the spare piston, and then obtain the fluid volume in the third space.

6. The automobile clutch slave cylinder according to claim 1, characterized in that: Also includes: A piston rod, the piston rod being arranged at an end of the common piston away from the spare piston; at least a portion of the piston rod protrudes from the pump body; A dust cover, the dust cover is arranged at one end of the pump body; the dust cover is sleeved on the portion of the piston rod protruding from the pump body; as well as An oil blocking ring is arranged at one end of the dust cover away from the pump body; the inner wall of the oil blocking ring slides and rubs against the outer wall of the piston rod.

7. The automobile clutch slave cylinder according to claim 6, characterized in that: The common piston is provided with a first moving groove along its own axis; the piston rod is provided with a second moving groove along its own axis; the automobile clutch cylinder also includes: A guide rod, one end of which is connected to one end of the spare piston facing the common piston; the guide rod can move along the axial direction of the common piston; at least part of the guide rod is inserted into the first movable groove; the outer wall of the guide rod slides and rubs with the inner wall of the movable groove; the guide rod can move along the first movable groove to the second movable groove.

8. The automobile clutch slave cylinder according to claim 1, characterized in that: It also includes a return spring, one end of which is arranged at the end of the common piston away from the spare piston; the other end of the return spring abuts against the inner wall of the other end of the pump body; the return spring is used to push the common piston to move the common piston toward one end of the pump body.

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