Clutch

Abstract

The utility model belongs to the field of gear shifting, and discloses a clutch. Comprising an input shaft, a clutch outer hub arranged at the outer end of the input shaft in a sleeving mode and a piston installed in the clutch outer hub, a valve sleeve is arranged on one side of the clutch outer hub, a first oil hole and a second oil hole are formed in the valve sleeve, and a third oil hole communicated with the first oil hole and a fourth oil hole communicated with the second oil hole are formed in the clutch outer hub; when the oil pressure is smaller than the first preset pressure, oil enters the first oil hole and the second oil hole and enters the inner pressure cavity, and the oil pressure acts on an inner ring of the piston; when the oil pressure is equal to the first preset pressure, a part of oil enters the second oil hole and the fourth oil hole and enters the outer pressure cavity, the oil pressure acts on the inner ring and the outer ring of the piston, when the oil pressure is larger than the first preset pressure, the oil pressure is released to the atmosphere through the fifth oil hole, and different function requirements of the clutch in the low-torque section and the high-torque section are met. The technical problems that in the prior art, a clutch is slow in oil flushing at the low rotating speed and large in torque fluctuation at the low torque are solved.

Description

Technical Field

[0001] This utility model belongs to the field of gear shifting technology and relates to a clutch. Background Technology

[0002] In the automotive transmission field, the clutch, as the core torque transmission component between the engine and the transmission, directly determines the overall vehicle driving performance through its dynamic response characteristics and torque control precision. When a car is starting, the engine speed is at a low level. Due to insufficient fuel pressure, the clutch's fuel injection speed is slow during engagement, which prolongs the clutch's response time. A longer response time means that the engine's power cannot be transmitted to the transmission system in a timely and effective manner, thus affecting the vehicle's starting performance.

[0003] To meet the torque transmission requirements of the clutch under different operating conditions, it is usually necessary to increase the clutch gain. Clutch gain is the ratio of torque change (Δtorque) to pressure change (Δpressure). Gain is directly proportional to the area of ​​the hydraulic pressure acting on the piston; that is, the larger the gain, the greater the torque that can be transmitted per unit pressure. When the vehicle system is operating in the low torque range, due to the larger gain, even slight pressure fluctuations in the system can cause significant changes in torque transmission. These torque fluctuations are directly transmitted to the transmission system and wheels, leading to instability during vehicle operation. Utility Model Content

[0004] The purpose of this invention is to provide a clutch to address the shortcomings of the prior art.

[0005] This utility model is achieved by the following technical solution: A clutch includes an input shaft, a clutch hub sleeved on the outer end of the input shaft, and a piston installed in the clutch hub. A valve sleeve is provided on one side of the clutch hub, and a first oil hole and a second oil hole are provided in the valve sleeve. A third oil hole communicating with the first oil hole and a fourth oil hole communicating with the second oil hole are provided in the clutch hub. Oil enters the inner pressure chamber through the first oil hole and the third oil hole and acts on the inner ring of the piston. Oil enters the outer pressure chamber through the second oil hole and the fourth oil hole and acts on the outer ring of the piston.

[0006] Furthermore, the valve sleeve is also provided with a valve core and an elastic component. The elastic component is sleeved on one end of the valve core. When the oil pressure increases to the first preset pressure, the valve core moves axially against the elastic force of the elastic component, so that the oil in the first oil hole and the second oil hole are connected.

[0007] Furthermore, the outer hub of the clutch is connected to the friction plate assembly via a fixing member. One end of the friction plate assembly abuts against the piston, and the other end abuts against the back plate. The back plate is axially limited by a first retaining ring.

[0008] Furthermore, the friction plate assembly is connected to the output gear via a fixing member, and a bearing is provided inside the output gear, with the bearing and the output gear being interference-fitted.

[0009] Furthermore, a reset element is provided at the end of the bearing near the piston, and the reset element is sleeved on the input shaft.

[0010] Furthermore, a support plate is provided between the reset member and the bearing, with one end of the reset member abutting against the piston and the other end abutting against the support plate.

[0011] Furthermore, a fifth oil hole is provided inside the valve sleeve. The fifth oil hole is located on the side of the second oil hole away from the first oil hole, and the fifth oil hole is in communication with the atmosphere.

[0012] Furthermore, the piston is sealed to the input shaft via a first connecting member, and the piston is sealed to the clutch outer hub via a second connecting member and a third connecting member.

[0013] Furthermore, one end of the bearing is fixedly connected to the input shaft via a third retaining ring, and the other end of the bearing is fixedly connected to the input shaft via a fourth retaining ring.

[0014] Furthermore, the support plate is fixedly connected to the input shaft via a second retaining ring.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] This invention relates to a clutch that enables segmented control of the piston's working area. When the oil pressure is less than a first preset pressure, the oil enters the first and second oil holes into the inner pressure chamber. The oil pressure acts on the inner ring of the piston, reducing the oil volume and shortening the oil flow time, thus improving clutch response. At this time, the oil pressure working area on the piston is small, resulting in a small clutch gain value, thereby reducing torque fluctuations caused by system pressure fluctuations and improving driving comfort. When the oil pressure equals the first preset pressure, a portion of the oil enters the second and fourth oil holes into the outer pressure chamber. The oil pressure acts on the inner and outer rings of the piston, increasing the piston's working area and thus increasing the gain value, thereby increasing the system torque capacity. This can meet the different functional requirements of the clutch in the low-torque and high-torque ranges.

[0017] This utility model discloses a clutch that, when the oil pressure exceeds a first preset pressure, releases oil to the atmosphere through a fifth oil hole, thus functioning as a pressure relief valve. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a clutch according to the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the clutch outer hub in an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the oil circuit in an embodiment of the present invention where the oil pressure is less than the first preset pressure;

[0022] Figure 4 This is a schematic diagram of the oil circuit in an embodiment of the present invention, where the oil pressure is equal to the first preset pressure.

[0023] Figure 5 This is a schematic diagram of the oil circuit in an embodiment of the present invention where the oil pressure is greater than the first preset pressure.

[0024] Figure label:

[0025] 1-Input shaft; 2-Clutch outer hub; 3-Piston; 4-First connecting piece; 5-Second connecting piece; 6-Third connecting piece; 7-Friction plate assembly; 8-Output gear; 9-First retaining ring; 10-Back plate; 11-Reset piece; 12-Second retaining ring; 13-Third retaining ring; 14-Support plate; 15-Fourth retaining ring; 16-Elastic component; 17-Valve core; 18-Valve sleeve; 19-Bearing; 20-First oil hole; 21-Third oil hole; 22-Inner pressure chamber; 23-Second oil hole; 24-Fourth oil hole; 25-Outer pressure chamber; 26-Fifth oil hole. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, such as a process, method, system, product, or apparatus comprising a series of steps or units, are not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings:

[0029] Example 1

[0030] This utility model provides a clutch, such as Figure 1 As shown, the clutch includes an input shaft 1, a clutch hub 2 sleeved on the outer end of the input shaft 1, and a piston 3 installed inside the clutch hub 2. A valve sleeve 18 is provided on one side of the clutch hub 2. A first oil hole 20 and a second oil hole 23 are provided inside the valve sleeve 18. A third oil hole 21 is provided inside the clutch hub 2, which communicates with the first oil hole 20. A fourth oil hole 24 is provided inside the clutch hub 2, which communicates with the second oil hole 23. Oil enters the inner pressure chamber 22 through the first oil hole 20 and the third oil hole 21 and acts on the inner ring of the piston 3. Oil enters the outer pressure chamber 25 through the second oil hole 23 and the fourth oil hole and acts on the outer ring of the piston 3.

[0031] Specifically, a clutch includes an input shaft 1, a clutch outer hub 2, a piston 3, a first connecting member 4, a second connecting member 5, a third connecting member 6, a friction plate assembly 7, an output gear 8, a first retaining ring 9, a back plate 10, a reset member 11, a second retaining ring 12, a third retaining ring 13, a support plate 14, a fourth retaining ring 15, an elastic component 16, a valve core 17, a valve sleeve 18, and a bearing 19. The valve sleeve 18 has a first oil hole 20, a second oil hole 23, and a fifth oil hole 26. The clutch outer hub 2 has a third oil hole 21 and a fourth oil hole 24. The first oil hole 20 is connected to the third oil hole 21, allowing oil to flow into the inner pressure chamber 22. The second oil hole 23 is connected to the fourth oil hole 24, allowing oil to flow into the outer pressure chamber 25. The fifth oil hole 26 is connected to the atmosphere.

[0032] The piston 3 is sealed to the input shaft 1 through the first connecting member 4, and the piston 3 is sealed to the clutch outer hub 2 through the second connecting member 5 and the third connecting member 6.

[0033] In this embodiment, the first connecting member 4 is a first sealing ring, the second connecting member 5 is a second sealing ring, the third connecting member 6 is a third sealing ring, the reset member 11 is a reset spring, and the elastic member 16 is a spring.

[0034] The clutch outer hub 2 is fixedly connected to the input shaft 1 by welding. A first connecting piece 4, a second connecting piece 5, and a third connecting piece 6 are fitted onto the piston 3 before it is inserted into the clutch outer hub 2. The piston 3, the clutch outer hub 2, the first connecting piece 4, the second connecting piece 5, and the third connecting piece 6 form an inner pressure chamber 22 and an outer pressure chamber 25. Figure 2 As shown.

[0035] The outer circle of the clutch outer hub 2 is connected to the friction plate assembly 7 through a fixing member. In this embodiment, the fixing member is a spline. One end of the friction plate assembly 7 abuts against the piston 3, and the other end abuts against the back plate 10. The back plate 10 is axially limited by the first retaining ring 9.

[0036] The friction plate assembly 7 is connected to the output gear 8 via a fixing member. The output gear 8 is equipped with a bearing 19, which is interference-fitted with the output gear 8 to support the output gear 8.

[0037] A reset element 11 is provided at one end of the bearing 19 near the piston 3. The reset element 11 is sleeved on the input shaft 1. The left and right sides of the bearing 19 are fixed to the input shaft 1 by the third retaining ring 13 and the fourth retaining ring 15 respectively. The bearing 19 can ensure the relative rotation of the output gear 8 and the input shaft 1.

[0038] The support plate 14 is fixed to the input shaft 1 by the second retaining ring 12, and a reset member 11 is installed between the support plate 14 and the piston 3. The valve sleeve 18 is connected to the clutch outer hub 2, and the valve sleeve 18 is provided with a valve core 17 and an elastic member 16. Under the action of oil pressure and the elastic member 16, the valve core 17 can move left and right.

[0039] One clutch working principle: When piston 3 is subjected to oil pressure and squeezes friction plate assembly 7, the reset element 11 is compressed, and the torque is transferred from input shaft 1. Clutch outer hub 2 Friction plate group 7 When the oil pressure decreases, the piston 3 returns to its original position under the action of the return spring 11, and the friction plate group 7 is no longer squeezed, thus disconnecting the torque transmission.

[0040] like Figure 3As shown, the first preset pressure is set according to the elastic component. When the oil pressure is less than the first preset pressure, the oil enters the inner pressure chamber 22 through the first oil hole 20 and the third oil hole 21, acting on the inner ring of the piston 3. At this time, the volume of the inner pressure chamber 22 is relatively small, so even if the oil pressure is low, the flushing can be completed quickly. At the same time, because the oil action area is small, the clutch gain is small, and the torque fluctuation caused by pressure fluctuation is also small.

[0041] like Figure 4 As shown, when the oil pressure equals the first preset pressure, the valve core 17 pushes the elastic component 16 to move towards the end of the elastic component 16, and the first oil hole 20 and the second oil hole 23 are connected. A portion of the oil enters the second oil hole 23 and enters the external pressure chamber 25 through the fourth oil hole 24, acting on the outer ring of the piston 3. At this time, the inner and outer rings of the piston 3 are simultaneously subjected to oil pressure. The area of ​​the oil pressure acting on the piston increases, the clutch gain increases, and the torque capacity also increases.

[0042] like Figure 5 As shown, when the oil pressure is greater than the first preset pressure, the valve core 17 continues to squeeze the elastic component 16 and move towards the spring 16 end. At this time, the oil is discharged to the atmosphere through the fifth oil hole 26, which acts as a pressure limiting valve.

[0043] In summary, when the oil pressure is less than the first preset pressure, the oil enters the first oil hole 20 and the second oil hole 23 into the inner pressure chamber 22. The oil pressure acts on the inner ring of the piston 3, reducing the flushing volume, shortening the flushing time, and improving the clutch response. When the oil pressure equals the first preset pressure, a portion of the oil enters the second oil hole 23 and the fourth oil hole 24 into the outer pressure chamber 25. The oil pressure acts on the inner and outer rings of the piston 3, increasing the piston's working area and thus increasing the gain value, thereby improving the system's torque capacity and meeting the different functional requirements of the clutch in the low-torque and high-torque ranges. When the oil pressure exceeds the first preset pressure, it is released to the atmosphere through the fifth oil hole 26, acting as a pressure relief valve.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A clutch, characterized in that: The clutch includes an input shaft (1), a clutch hub (2) sleeved on the outer end of the input shaft (1), and a piston (3) installed in the clutch hub (2). A valve sleeve (18) is provided on one side of the clutch hub (2). A first oil hole (20) and a second oil hole (23) are provided in the valve sleeve (18). A third oil hole (21) is provided in the clutch hub (2) and communicates with the first oil hole (20). A fourth oil hole (24) is provided in the clutch hub (2) and communicates with the second oil hole (23). The oil enters the inner pressure chamber (22) through the first oil hole (20) and the third oil hole (21) and acts on the inner ring of the piston (3). The oil enters the outer pressure chamber (25) through the second oil hole (23) and the fourth oil hole and acts on the outer ring of the piston (3).

2. The clutch according to claim 1, characterized in that: The valve sleeve (18) is also provided with a valve core (17) and an elastic component (16). The elastic component (16) is sleeved on one end of the valve core (17). When the oil pressure increases to the first preset pressure, the valve core (17) moves axially against the elastic force of the elastic component (16), so that the oil in the first oil hole (20) and the oil in the second oil hole (23) are connected.

3. The clutch according to claim 1, characterized in that: The clutch outer hub (2) is connected to the friction plate assembly (7) through a fixing member. One end of the friction plate assembly (7) abuts against the piston (3) and the other end abuts against the back plate (10). The back plate (10) is axially limited by the first retaining ring (9).

4. The clutch according to claim 3, characterized in that: The friction plate assembly (7) is connected to the output gear (8) through a fixing member. The output gear (8) is provided with a bearing (19), and the bearing (19) is interference-fitted with the output gear (8).

5. The clutch according to claim 4, characterized in that: The bearing (19) is provided with a reset member (11) near the piston (3), and the reset member (11) is sleeved on the input shaft (1).

6. The clutch according to claim 5, characterized in that: A support plate (14) is provided between the reset member (11) and the bearing (19). One end of the reset member (11) abuts against the piston (3), and the other end abuts against the support plate (14).

7. The clutch according to claim 2, characterized in that: The valve sleeve (18) is also provided with a fifth oil hole (26), which is located on the side of the second oil hole (23) away from the first oil hole (20) and is connected to the atmosphere.

8. The clutch according to claim 1, characterized in that: The piston (3) is sealed to the input shaft (1) through the first connector (4), and the piston (3) is sealed to the clutch outer hub (2) through the second connector (5) and the third connector (6).

9. The clutch according to claim 5, characterized in that: One end of the bearing (19) is fixedly connected to the input shaft (1) via a third retaining ring (13), and the other end of the bearing (19) is fixedly connected to the input shaft (1) via a fourth retaining ring (15).

10. The clutch according to claim 6, characterized in that: The support plate (14) is fixedly connected to the input shaft (1) by the second retaining ring (12).

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