Adjustable hydraulic release bearing and hydraulic system

Abstract

The invention relates to the technical field of automobile parts, and discloses an adjustable hydraulic release bearing and a hydraulic system. Comprising a hydraulic cylinder and a sliding sleeve, the hydraulic cylinder comprises a base, an inner cylinder barrel and an outer cylinder barrel, the inner cylinder barrel and the outer cylinder barrel are connected to the base, a hydraulic cavity is formed between the inner cylinder barrel and the outer cylinder barrel, one end of the sliding sleeve is slidably connected into the hydraulic cavity, and a cooling structure is arranged on the hydraulic cylinder and comprises a cooling channel arranged in the outer cylinder barrel and a refrigeration box; the refrigeration box is communicated with an output pipe and a return pipe, and the output pipe and the return pipe are both communicated with the cooling channel; a sealing piece is arranged at the end, located in the hydraulic cavity, of the sliding sleeve, and the two sides of the sealing piece abut against the side walls of the inner cylinder barrel and the outer cylinder barrel correspondingly. The cooling channel is formed in the outer cylinder barrel of the hydraulic cylinder, and a medium in the cooling channel circulates through the refrigeration box, so that the temperature of the hydraulic cylinder is reduced, and the problem of oil leakage of the hydraulic cylinder caused by damage of a sealing piece due to high temperature is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts, and in particular to an adjustable hydraulic release bearing and a hydraulic system. Background Art

[0002] Release bearings are essential components in automotive transmission systems. Their primary function is to connect and disconnect the vehicle's engine and transmission system through axial movement, enabling smooth starting, shifting, and stopping. They also protect the vehicle's transmission system from overloads. Hydraulic release bearings are a new type of bearing widely used in industrial manufacturing and locomotive transportation. Compared to traditional bearings, they offer advantages such as reduced wear and a longer lifespan.

[0003] Since the hydraulic release bearing is easily affected by high temperature, the seals of the hydraulic release bearing will age and wear, which can easily cause oil leakage, resulting in incomplete clutch separation, further aggravating the temperature increase, and ultimately leading to damage to the hydraulic release bearing and clutch; at the same time, the hydraulic release bearing is prone to overloading when in contact with the clutch pressure plate spring, affecting the life of the hydraulic release bearing and easily generating noise. Summary of the Invention

[0004] In order to improve the problem that the hydraulic release bearing is easily affected by high temperature, which causes aging and wear of the seals of the hydraulic release bearing and thus oil leakage, the present application provides an adjustable hydraulic release bearing and a hydraulic system.

[0005] The adjustable hydraulic release bearing and hydraulic system provided in this application adopt the following technical solutions: A hydraulic system includes a hydraulic cylinder and a sleeve. The hydraulic cylinder includes a base and an inner cylinder and an outer cylinder connected to the base. A hydraulic chamber is formed between the inner cylinder and the outer cylinder. One end of the sleeve is slidably connected to the hydraulic chamber. A cooling structure is provided on the hydraulic cylinder. The cooling structure includes a cooling channel provided in the outer cylinder, and a refrigeration box. The refrigeration box is connected to an output pipe and a return pipe, and both the output pipe and the return pipe are connected to the cooling channel. A seal is provided on one end of the sleeve located in the hydraulic chamber, and both sides of the seal abut against the side walls of the inner cylinder and the outer cylinder, respectively.

[0006] By adopting the above technical solution, under the action of liquid pressure, the sleeve reciprocates along the hydraulic chamber, and at the same time drives the movement of the seal. Due to the long-term operation of the clutch, the temperature rises, and through the transfer of heat, the temperature of the hydraulic cylinder rises. Under high temperature, the seal and the inner wall of the hydraulic chamber rub against each other, causing aging and wear of the seal. By providing a cooling channel in the outer cylinder barrel of the hydraulic cylinder and realizing the circulation of the medium in the cooling channel through the refrigeration box, the temperature of the hydraulic cylinder is reduced, and damage to the seal caused by high temperature is avoided, and oil leakage in the hydraulic cylinder is avoided.

[0007] Optionally, a sealing sleeve is provided between the inner cylinder and the sliding sleeve, and a mounting groove is provided on the circumferential side of the outer wall of the inner cylinder. The sealing sleeve is sleeved on the inner cylinder and fixed in the mounting groove. A plurality of sealing convex rings are provided on the circumference of the sealing sleeve close to the sliding sleeve, and the sealing convex rings abut against the side wall of the sliding sleeve.

[0008] By adopting the above technical solution, when the sleeve moves in the hydraulic chamber and the sleeve is subjected to uneven force, an unbalanced load phenomenon will occur, resulting in wear between the sleeve and the inner wall of the hydraulic chamber, reducing the service life of the hydraulic cylinder and the sleeve. By arranging a sealing sleeve between the sleeve and the inner cylinder, on the one hand, the stability of the sleeve is guaranteed, and when the sleeve is unbalanced, the offset of the sleeve is reduced, the contact between the sleeve and the inner wall of the hydraulic chamber is reduced, and wear is avoided; on the other hand, the sealing between the sleeve and the inner wall of the hydraulic chamber is increased, and the oil leakage problem is reduced; a number of sealing convex rings are arranged on the contact surface between the sealing sleeve and the sleeve to reduce the contact area between the sealing sleeve and the sleeve, thereby reducing friction, which is beneficial to the sliding of the sleeve and increases the reliability of the seal.

[0009] Optionally, a compression spring and a dust cover are provided on the circumferential side of the hydraulic cylinder, the dust cover is provided outside the compression spring, a platform is provided on the end of the sliding sleeve away from the hydraulic cylinder, a fixing groove 1 is provided on the side of the platform close to the hydraulic cylinder, a fixing groove 2 is provided on the base, the two ends of the compression spring are respectively clamped in the fixing groove 1 and the fixing groove 2, a connecting groove 1 is provided on the circumferential side of the platform, a connecting groove 2 is provided on the circumferential side of the base, and the two ends of the dust cover are respectively sleeved in the connecting groove 1 and the connecting groove 2.

[0010] By adopting the above technical solution, a compression spring is arranged between the sleeve and the hydraulic cylinder. When the sleeve moves into the hydraulic cylinder, the compression spring is compressed and the elastic potential energy increases. When the sleeve moves out of the hydraulic cylinder, the elastic potential energy of the compression spring is released, driving the sleeve to move, thereby reducing the pressure of the hydraulic oil delivered to the hydraulic chamber, making it easier for the driver to step on the clutch pedal. By providing a dust cover, dust is prevented from entering the hydraulic chamber, thereby increasing the service life of the hydraulic cylinder.

[0011] Optionally, a clamping portion is provided on the sealing member, and a clamping groove is provided on the end surface of one end of the sliding sleeve located in the hydraulic cylinder, and the clamping portion is clamped in the clamping groove.

[0012] By adopting the above technical solution, the clamping portion is clamped in the clamping groove, thereby increasing the stability of the connection between the sealing member and the sliding sleeve and preventing the sealing member from falling off.

[0013] Optionally, a limiting groove is provided on the outer side wall of the inner cylinder, a limiting ring is provided in the limiting groove, and the limiting ring is used to limit the maximum displacement of the sliding sleeve.

[0014] By adopting the above technical solution, the maximum displacement of the sliding sleeve is limited by the limit ring, thereby preventing the sliding sleeve from slipping out of the hydraulic cavity.

[0015] Optionally, an oil inlet interface and an exhaust interface are provided on the base, and both the oil inlet interface and the exhaust interface are connected to the hydraulic cavity. The oil inlet interface is connected to an oil inlet pipe, and the exhaust interface is connected to an exhaust pipe, and a control valve is provided on the exhaust pipe.

[0016] By adopting the above technical solution, when in use, hydraulic oil is delivered to the hydraulic chamber through the oil inlet pipe, the control valve is opened to discharge excess air in the hydraulic chamber, and then the control valve is closed to ensure that the hydraulic chamber wall is filled with hydraulic oil. At the same time, the presence of air in the hydraulic chamber is avoided, which may lead to problems such as unstable power transmission of the hydraulic cylinder and local overheating.

[0017] An adjustable hydraulic release bearing includes a release bearing, which is installed on a hydraulic system and is used to abut against a clutch pressure plate. The release bearing includes an outer ring, an inner ring, balls and a retaining frame. The balls are arranged between the inner ring and the outer ring and constrained by the retaining frame. One end of the outer ring is installed on a sliding sleeve, and the other end of the outer ring is sleeved on a sealing ring. One end of the sealing ring abuts against the surface of the inner ring.

[0018] By adopting the above technical solution, the release bearing is driven to move by the hydraulic system, and the release bearing presses the clutch pressure plate to achieve clutch separation. By providing a sealing ring between the inner ring and the outer ring, dust is prevented from entering the release bearing and affecting its rotation, which is beneficial to increasing the service life of the release bearing.

[0019] Optionally, an elastic connecting member is provided between the outer ring and the sliding sleeve, and the elastic connecting member includes a base plate, and elastic plate 1 and elastic plate 2 are respectively provided on the inner and outer sides of the base plate, the base plate abuts against the platform, and a protrusion is provided on the side of the platform away from the hydraulic cylinder, a groove 1 is provided on the inner side of the protrusion, and the elastic plate 1 is clamped in the groove 1, a connecting portion is provided at one end of the outer ring close to the sliding sleeve, a groove 2 is provided on the inner side of the connecting portion, and the elastic plate 2 is clamped in the groove 2, and an elastic gasket is provided between the outer ring and the protrusion.

[0020] By adopting the above technical solution, the outer ring is connected to the sliding sleeve through an elastic connecting member and an elastic gasket. By arranging elastic plate 1 and elastic plate 2 on the elastic connecting member, when the release bearing is overloaded, the connecting portion on the outer ring squeezes the elastic plate 2 on one side, and the raised portion squeezes the elastic plate 1 on the other side, thereby adjusting the offset of the release bearing and avoiding damage to the release bearing.

[0021] Optionally, an extension ring is provided on the inner ring, and the extension ring abuts against the clutch pressure plate. The outer wall of the extension ring protrudes outward to form a plurality of guide parts. A slide groove is provided on the side wall of the inner ring, and the guide part is slidably connected in the slide groove. An adjusting member is provided between the extension ring and the inner ring, and a groove is formed on the inner side of the guide part. The adjusting member is provided in the groove, one end of the adjusting member is rotatably connected to the inner ring, and the middle part of the adjusting member is threadedly connected to the extension ring.

[0022] By adopting the above technical solution, there is a difference in the distance between the release bearing and the clutch pressure plate, and an extension ring is set to abut the clutch pressure plate. By adjusting the position of the extension ring, the applicable range of the hydraulic release bearing is increased; a guide part is set on the extension ring. On the one hand, the guide part slides along the slide groove to limit the relative rotation of the extension ring and the inner ring. On the other hand, the guide part can increase the structural strength of the extension ring.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a cooling channel on the outer cylinder of the hydraulic cylinder and circulating the medium in the cooling channel through the refrigeration box, the temperature of the hydraulic cylinder can be reduced to avoid damage to the seals caused by high temperature, which may lead to oil leakage in the hydraulic cylinder.

[0024] 2. The outer ring is connected to the sliding sleeve through an elastic connector and an elastic gasket. By arranging elastic plate 1 and elastic plate 2 on the elastic connector, when the release bearing is overloaded, the connecting portion on the outer ring squeezes elastic plate 2 on one side, and the guide portion squeezes elastic plate 1 on the other side, thereby adjusting the offset of the release bearing and avoiding damage to the release bearing.

[0025] 3. Due to the difference in the distance between the release bearing and the clutch pressure plate, an extension ring is set to abut against the clutch pressure plate, and the position of the extension ring is adjusted to increase the applicable range of the hydraulic release bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the adjustable hydraulic release bearing and hydraulic system of this application.

[0027] Figure 2 It is a top view of the adjustable hydraulic release bearing of the present application.

[0028] Figure 3 yes Figure 2 Cross-section of AA.

[0029] Figure 4 This is an enlarged view of part B in convex 3.

[0030] Figure 5 It is a structural diagram of the connection between the separation bearing and the shaft sleeve of the present application.

[0031] Figure 6 It is a structural schematic diagram of the connection between the release bearing and the extension ring of the present application.

[0032] Figure 7 It is a structural diagram of the elastic connector of this application.

[0033] Figure numerals: 1, release bearing; 11, inner ring; 111, slide groove; 12, outer ring; 121, connection part; 122, second clamping groove; 13, retaining frame; 14, ball; 15, sealing ring; 2, hydraulic cylinder; 21, base; 211, second fixing groove; 212, second connecting groove; 213, oil inlet interface; 214, exhaust interface; 22, inner cylinder; 221, limit groove; 222, mounting groove; 23, outer cylinder; 24, hydraulic chamber; 25, oil inlet pipe; 26, exhaust pipe; 261, control valve; 27, drop Temperature channel; 28. Sealing sleeve; 281. Sealing convex ring; 29. ​​Limiting ring; 3. Sliding sleeve; 31. Platform; 32. Raised part; 33. Fixing groove 1; 34. Clamping groove 1; 35. Connecting groove 1; 36. Clamping groove; 4. Elastic connecting part; 41. Bottom plate; 42. Elastic plate 1; 43. Elastic plate 2; 5. Elastic gasket; 6. Extension ring; 61. Guide part; 62. Adjusting part; 7. Sealing part; 71. Clamping part; 8. Refrigeration box; 81. Output pipe; 82. Return pipe; 9. Dust cover; 10. Compression spring. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further explained below with reference to specific illustrations.

[0035] Reference Figure 1-4 The hydraulic system includes a hydraulic cylinder 2 and a sleeve 3. The hydraulic cylinder 2 is an integrally formed structure. The hydraulic cylinder 2 includes a base 21 and an inner cylinder 22 and an outer cylinder 23 connected to the base 21. A hydraulic chamber 24 is formed between the inner cylinder 22 and the outer cylinder 23. One end of the sleeve 3 is slidably connected to the hydraulic chamber 24. A cooling structure is provided on the hydraulic cylinder 2. The cooling structure includes a cooling channel 27 arranged in the outer cylinder 23, and a refrigeration box 8. The cooling channel 27 is arranged around the inner circumference of the outer cylinder 23. The cooling channel 27 is used to fill cold air or cooling water. The refrigeration box 8 is connected to an output pipe 81 and a return pipe 82, and the output pipe 81 and the return pipe 82 are both connected to the cooling channel 27; one end of the sleeve 3 located in the hydraulic chamber 24 is connected to a seal 7, and both sides of the seal 7 are respectively abutted against the side walls of the inner cylinder 22 and the outer cylinder 23.

[0036] When in use, the refrigeration box 8 realizes the circulation of the medium in the cooling channel 27 through the output pipe 81 and the return pipe 82, thereby reducing the temperature of the hydraulic cylinder 2, preventing the seal 7 from being damaged by high temperature, and avoiding oil leakage in the hydraulic cylinder 2.

[0037] A sealing sleeve 28 is provided between the inner cylinder 22 and the sliding sleeve 3. A mounting groove 222 is provided on the circumferential side of the outer wall of the inner cylinder 22. The sealing sleeve 28 is sleeved on the inner cylinder 22 and fixed in the mounting groove 222. A plurality of sealing convex rings 281 are provided along the circumference of the side of the sealing sleeve 28 close to the sliding sleeve 3. The sealing convex rings 281 abut against the side wall of the sliding sleeve 3.

[0038] During use, when the sleeve 3 moves in the hydraulic chamber 24, due to the uneven force on the sleeve 3, the sleeve 3 will be unbalanced, affecting the stability of the sliding motion, causing wear between the sleeve 3 and the inner wall of the hydraulic chamber 24, and reducing the service life of the hydraulic cylinder 2 and the sleeve 3. By arranging a sealing sleeve 28 between the sleeve 3 and the inner cylinder 22, on the one hand, the stability of the sleeve 3 is guaranteed, and when unbalanced, the offset of the sleeve 3 is reduced, the contact between the sleeve 3 and the inner wall of the hydraulic chamber 24 is reduced, and wear is avoided; on the other hand, the sealing between the sleeve 3 and the inner wall of the hydraulic chamber 24 is increased, and oil leakage between the sleeve 3 and the hydraulic chamber 24 is avoided; a number of sealing convex rings 281 are arranged on the contact surface between the sealing sleeve 28 and the sleeve 3 to reduce the contact area between the sealing sleeve 28 and the sleeve 3, thereby reducing friction, which is beneficial to the sliding of the sleeve 3 and at the same time increases the reliability of the seal.

[0039] A compression spring 10 and a dust cover 9 are provided on the circumferential side of the hydraulic cylinder 2. The dust cover 9 is provided outside the compression spring 10. A platform 31 is provided on the end of the sleeve 3 away from the hydraulic cylinder 2. The platform 31 extends toward the outside of the sleeve 3. A fixing groove 1 33 is provided on the side of the platform 31 close to the hydraulic cylinder 2, and a fixing groove 2 211 is provided on the base 21. The two ends of the compression spring 10 are respectively clamped in the fixing groove 1 33 and the fixing groove 2 211; a connecting groove 1 35 is provided on the circumferential side of the platform 31, and a connecting groove 2 212 is provided on the circumferential side of the base 21. The two ends of the dust cover 9 are respectively sleeved in the connecting groove 1 35 and the connecting groove 2 212.

[0040] During use, the sleeve 3 moves into the hydraulic cylinder 2, the compression spring 10 is compressed, and the elastic potential energy increases. When the sleeve 3 moves out of the hydraulic cylinder 2, the elastic potential energy of the compression spring 10 is released, driving the sleeve 3 to move, thereby reducing the pressure of the hydraulic oil delivered to the hydraulic chamber 24, making it easier for the driver to step on the clutch pedal; by providing a dust cover 9, dust is prevented from entering the hydraulic chamber 24, thereby increasing the service life of the hydraulic cylinder 2.

[0041] A clamping portion 71 is provided on the seal 7, and a clamping groove 36 is provided on the end surface of the sleeve 3 at one end inside the hydraulic cylinder 2. The connecting portion 121 is clamped in the clamping groove 36 to increase the stability of the connection between the seal 7 and the sleeve 3 and prevent the seal 7 from falling off.

[0042] A limiting groove 221 is provided on the outer wall of the inner cylinder 22 , and a limiting ring 29 is disposed in the limiting groove 221 . The limiting ring 29 is used to limit the maximum displacement of the sliding sleeve 3 to prevent the sliding sleeve 3 from slipping out of the hydraulic chamber 24 .

[0043] An oil inlet interface 213 and an exhaust interface 214 are provided on the base 21. The oil inlet interface 213 and the exhaust interface 214 are both connected to the hydraulic chamber 24. The oil inlet interface 213 is connected to an oil inlet pipe 25, and the oil inlet pipe 25 is connected to an external hydraulic pump; the exhaust interface 214 is connected to an exhaust pipe 26, and a control valve 261 is provided on the exhaust pipe 26.

[0044] During use, hydraulic oil is delivered to the hydraulic chamber 24 through the oil inlet pipe 25, the control valve 261 is opened to discharge the excess air in the hydraulic chamber 24 from the exhaust pipe 26, and then the control valve 261 is closed to ensure that the wall of the hydraulic chamber 24 is filled with hydraulic oil, while avoiding the presence of air in the hydraulic chamber 24, which may cause problems such as unstable power transmission and local overheating of the hydraulic cylinder 2.

[0045] Reference Figure 1-3 , an adjustable hydraulic release bearing, including a release bearing 1, which is installed on a hydraulic system. The release bearing 1 is used to abut against the clutch pressure plate. The release bearing 1 is installed on the hydraulic system, and the movement of the release bearing 1 is driven by the hydraulic system. The release bearing 1 includes an outer ring 12, an inner ring 11, balls 14 and a retainer 13. The balls 14 are arranged between the inner ring 11 and the outer ring 12 and constrained by the retainer 13. One end of the outer ring 12 is installed on the sliding sleeve 3, and the other end of the outer ring 12 is sleeved on the sealing ring 15. One end of the sealing ring 15 abuts against the surface of the inner ring 11 to prevent dust from entering the release bearing 1 and affecting the rotation of the release bearing 1, which is beneficial to increasing the service life of the release bearing 1.

[0046] Reference Figure 5 and Figure 7 An elastic connecting member 4 is provided between the outer ring 12 and the sleeve 3, and the elastic connecting member 4 includes a bottom plate 41, and an elastic plate 1 42 and an elastic plate 2 43 are respectively provided on the inner and outer sides of the bottom plate 41, and the elastic plate 1 42 and the elastic plate 2 43 are tooth-shaped, and the bottom plate 41 abuts against the platform 31, and a protrusion 32 is provided on the side of the platform 31 away from the hydraulic cylinder 2, and a groove 1 34 is provided on the inner side of the protrusion 32, and the elastic plate 1 42 is clamped in the groove 1 34. A connecting portion 121 is provided at one end of the outer ring 12 close to the sleeve 3, and a groove 2 122 is provided on the inner side of the connecting portion 121, and the elastic plate 2 43 is clamped in the groove 2 122; when the release bearing 1 is overloaded, the connecting portion 121 on the outer ring 12 squeezes the elastic plate 2 43 on one side, and the protrusion 32 squeezes the elastic plate 1 42 on the other side, thereby adjusting the offset of the release bearing 1 and avoiding damage to the release bearing 1.

[0047] An elastic gasket 5 is provided between the outer ring 12 and the raised portion 32. The elastic gasket 5 is clamped in the gap between the outer ring 12 and the raised portion 32. On the one hand, the elastic gasket 5 plays a shock-absorbing role, and on the other hand, it limits the outer ring 12 from approaching the platform 31, ensuring that the elastic plate 2 43 is clockwise connected to the card slot 2 122.

[0048] Reference Figure 3 and Figure 6 An extension ring 6 is provided on the inner ring 11, and the extension ring 6 is used to abut against the clutch pressure plate. The outer wall of the extension ring 6 protrudes outward to form a plurality of guide parts 61, and a groove is formed on the inner side of the guide part 61. A slide groove 111 is provided on the side wall of the inner ring 11, and the guide part 61 is slidably connected in the slide groove 111. An adjusting member 62 is provided between the extension ring 6 and the inner ring 11, and the adjusting member 62 is provided in the groove. One end of the adjusting member 62 is rotatably connected to the inner ring 11, and the middle part of the adjusting member 62 is threadedly connected to the extension ring 6.

[0049] Since there is a difference in the distance between the release bearing 1 and the clutch pressure plate, an extension ring 6 is provided and its position is adjusted so that it abuts against the clutch pressure plate, thereby increasing the applicable range of the hydraulic release bearing 1; a guide portion 61 is provided on the extension ring 6. On the one hand, the guide portion 61 slides along the slide groove 111 to limit the relative rotation between the extension ring 6 and the inner ring 11; on the other hand, the guide portion 61 can increase the structural strength of the extension ring 6.

[0050] The implementation principle of the adjustable hydraulic release bearing in the embodiment of the present application is: before use, first empty the hydraulic chamber 24, open the control valve 261 on the exhaust pipe 26, and repeatedly step on the clutch pedal to inject hydraulic oil into the hydraulic chamber 24 and fill it with hydraulic oil, discharge the excess air in the hydraulic chamber 24, and close the control valve 261.

[0051] During normal use, based on the characteristics of liquid pressure transmission, when the clutch pedal is stepped on, hydraulic oil is injected into the hydraulic cylinder 2 through the hydraulic system. Under the action of liquid pressure, the seal 7 and the sleeve 3 are driven to move, thereby driving the movement of the release bearing 1. The release bearing 1 squeezes the clutch pressure plate to disengage the clutch.

[0052] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hydraulic system, characterized in that: The invention comprises a hydraulic cylinder (2) and a sleeve (3). The hydraulic cylinder (2) comprises a base (21) and an inner cylinder barrel (22) and an outer cylinder barrel (23) connected to the base (21). A hydraulic chamber (24) is formed between the inner cylinder barrel (22) and the outer cylinder barrel (23). One end of the sleeve (3) is slidably connected to the hydraulic chamber (24). The hydraulic cylinder (2) is provided with a cooling structure. The cooling structure comprises a cooling channel (27) arranged in the outer cylinder barrel (23), and a refrigeration box (8). The refrigeration box (8) is connected with an output pipe (81) and a return pipe (82). Both the output pipe (81) and the return pipe (82) are connected with the cooling channel (27). A sealing member (7) is provided at one end of the sleeve (3) located in the hydraulic chamber (24). Both sides of the sealing member (7) are respectively in contact with the side walls of the inner cylinder barrel (22) and the outer cylinder barrel (23).

2. The hydraulic system according to claim 1, characterized in that: A sealing sleeve (28) is arranged between the inner cylinder (22) and the sliding sleeve (3); a mounting groove (222) is provided on the circumferential side of the outer wall of the inner cylinder (22); the sealing sleeve (28) is sleeved on the inner cylinder (22) and fixed in the mounting groove (222); a plurality of sealing convex rings (281) are arranged on the circumference of the sealing sleeve (28) on one side close to the sliding sleeve (3); the sealing convex rings (281) abut against the side wall of the sliding sleeve (3).

3. The hydraulic system according to claim 1, characterized in that: A compression spring (10) and a dust cover (9) are arranged on the circumferential side of the hydraulic cylinder (2), and the dust cover (9) is arranged outside the compression spring (10). A platform (31) is arranged on the end of the sliding sleeve (3) away from the hydraulic cylinder (2), and a fixing groove (33) is provided on the side of the platform (31) close to the hydraulic cylinder (2). A fixing groove (211) is provided on the base (21), and the two ends of the compression spring (10) are respectively clamped in the fixing groove (33) and the fixing groove (211). A connecting groove (35) is provided on the circumferential side of the platform (31), and a connecting groove (212) is provided on the circumferential side of the base (21). The two ends of the dust cover (9) are respectively sleeved in the connecting groove (35) and the connecting groove (212).

4. The hydraulic system according to claim 1, characterized in that: The sealing member (7) is provided with a clamping portion (71), and a clamping groove (36) is provided on the end surface of one end of the sliding sleeve (3) located inside the hydraulic cylinder (2), and the clamping portion (71) is clamped in the clamping groove (36).

5. The hydraulic system according to claim 1, characterized in that: A limiting groove (221) is provided on the outer wall of the inner cylinder (22), a limiting ring (29) is arranged in the limiting groove (221), and the limiting ring (29) is used to limit the maximum displacement of the sliding sleeve (3).

6. The hydraulic system according to claim 1, characterized in that: The base (21) is provided with an oil inlet interface (213) and an exhaust interface (214); the oil inlet interface (213) and the exhaust interface (214) are both in communication with the hydraulic chamber (24); the oil inlet interface (213) is connected to an oil inlet pipe (25); the exhaust interface (214) is connected to an exhaust pipe (26); and a control valve (261) is provided on the exhaust pipe (26).

7. An adjustable hydraulic release bearing, comprising a release bearing (1), wherein the release bearing (1) is mounted on a hydraulic system according to any one of claims 1 to 6, characterized in that: The release bearing (1) comprises an outer ring (12), an inner ring (11), a ball (14) and a retaining frame (13); the ball (14) is arranged between the inner ring (11) and the outer ring (12) and is restrained by the retaining frame (13); one end of the outer ring (12) is mounted on the sliding sleeve (3); the other end of the outer ring (12) is sleeved on a sealing ring (15); one end of the sealing ring (15) abuts against the surface of the inner ring (11).

8. The adjustable hydraulic release bearing according to claim 7, characterized in that: An elastic connecting member (4) is arranged between the outer ring (12) and the sliding sleeve (3), and the elastic connecting member (4) comprises a bottom plate (41), and an elastic plate 1 (42) and an elastic plate 2 (43) are arranged on the inner and outer sides of the bottom plate (41), respectively. The bottom plate (41) is in contact with the platform (31), and a protrusion (32) is arranged on the side of the platform (31) away from the hydraulic cylinder (2), and a clamping groove 1 (34) is provided on the inner side of the protrusion (32), and the elastic plate 1 (42) is clamped in the clamping groove 1 (34). A connecting member (121) is arranged at one end of the outer ring (12) close to the sliding sleeve (3), and a clamping groove 2 (122) is provided on the inner side of the connecting member (121), and the elastic plate 2 (43) is clamped in the clamping groove 2 (122). An elastic gasket (5) is arranged between the outer ring (12) and the protrusion (32).

9. The adjustable hydraulic release bearing according to claim 7, characterized in that: An extension ring (6) is arranged on the inner ring (11), and the extension ring (6) abuts against the clutch pressure plate. The outer wall of the extension ring (6) protrudes outward to form a plurality of guide parts (61). A slide groove (111) is arranged on the side wall of the inner ring (11), and the guide part (61) is slidably connected in the slide groove (111). An adjustment member (62) is arranged between the extension ring (6) and the inner ring (11), and a groove is formed on the inner side of the guide part (61). The adjustment member (62) is arranged in the groove. One end of the adjustment member (62) is rotatably connected to the inner ring (11), and the middle part of the adjustment member (62) is threadedly connected to the extension ring (6).

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