Wet clutch with one-way valve

Abstract

The utility model relates to a wet clutch with a one-way valve, which solves the technical problems that oil in an oil cavity of the existing wet clutch is difficult to discharge quickly after a gear is taken off, or the structure is more complicated. The clutch support is sleeved on a rotating shaft, the piston is arranged in the clutch support, the spring and the friction plate group are positioned on one side of a piston inner cavity in the piston, and the oil duct is arranged in the clutch support and communicated with a clutch oil cavity. A one-way valve is arranged outside the piston far away from the rotating shaft; the other end of the one-way valve is communicated with the clutch oil cavity; when the clutch oil cavity is pressurized, oil liquid enters the clutch oil cavity from the oil duct and enters the one-way valve, and the one-way valve is closed; when the clutch oil cavity is decompressed, the spring resets and pushes the piston to reset, oil close to the rotating shaft is discharged out of the oil channel, the one-way valve is opened, and oil away from the rotating shaft is discharged out of the one-way valve and flows to one side of the inner cavity of the piston.

Description

Technical Field

[0001] The utility model relates to a clutch in a gearbox, in particular to a wet clutch with a one-way valve. Background Art

[0002] As the core component of the gearbox of a high-horsepower tractor, the wet clutch is the bridge for power transmission between the engine and the gearbox. The working principle of the wet clutch is as follows: when the wet clutch needs to start working, the oil chamber is filled with oil to hydraulically push the piston to press the friction plate group to make it combine, thereby realizing power transmission; when the wet clutch needs to stop working, the oil in the oil chamber is discharged, so that the piston quickly resets, thereby cutting off power transmission.

[0003] Figure 1 The figure shows a commonly used wet clutch, including: a clutch support 04 sleeved on the rotating shaft, a piston 01 arranged in the clutch support 04, a spring 02 and a friction plate group 03 located on one side of the piston inner cavity in the piston 01, and an oil channel 06 arranged in the clutch support 04 and connected to the clutch oil chamber 05. The disadvantage is that after the oil in the oil chamber is partially discharged, the wet clutch will continue to rotate under the action of inertia, so that part of the oil is thrown to the oil chamber away from the rotating shaft side, and because the oil channel for discharging the oil is located on the side of the oil chamber close to the rotating shaft, it is difficult to discharge the oil away from the other side of the rotating shaft. If the oil in the oil chamber cannot be completely discharged in time, the piston cannot be reset in time, and then there are problems such as the gear position of the wet clutch cannot be removed and the friction plate group is abnormally worn.

[0004] To solve this problem, Chinese patent CN107269743 A discloses a wet clutch power output device and a tractor. The wet clutch power output device provided by the patent includes a clutch hub, an intermediate hub, a first piston, a pressure plate, a clutch assembly and a brake assembly. When the hydraulic oil enters the piston cavity through the oil inlet hole, it pushes the first piston to squeeze the clutch assembly, the clutch is engaged, and the power input shaft drives the clutch load to rotate synchronously through the clutch assembly; when the hydraulic oil 1 is drained, the first piston is reset, and the first piston does not squeeze the clutch assembly at this time, and the clutch is separated. When the clutch is separated, the hydraulic oil pushes the second piston to squeeze the brake assembly and brake the clutch load, which can realize the braking of the power output system and prevent the power output shaft from continuing to rotate under the inertia F after the clutch is separated. However, the wet clutch structure provided by the patent is relatively complex.

[0005] Chinese patent CN110431327A discloses a wet clutch assembly, including: a clutch drum; a clutch chamber, which is formed inside the clutch drum; a clutch actuating piston, which is movably arranged inside the clutch drum and is configured to be actuated by means of hydraulic pressure in the clutch chamber; and a fluid pipeline, which at least partially extends through the clutch actuating piston, and the fluid pipeline is connected to the fluid of the clutch chamber for filling the clutch chamber via the fluid pipeline. However, the main problem solved by the patent is the low-cost design of the wet clutch, and there is no design related to oil discharge. Utility Model Content

[0006] The utility model aims to solve the technical problems that the oil in the clutch oil chamber of the existing wet clutch is difficult to be quickly discharged after the gear is disengaged, or the structure is relatively complicated, and to provide a wet clutch with a one-way valve.

[0007] In order to achieve the above purpose, the technical solutions provided by the utility model are as follows:

[0008] A wet clutch with a one-way valve comprises: a clutch support sleeved on a rotating shaft, a piston arranged in the clutch support, a spring and a friction plate group located on one side of a piston inner cavity in the piston, and an oil passage arranged in the clutch support and connected to the clutch oil cavity;

[0009] Its special features are:

[0010] A one-way valve is provided at the outer side of the piston away from the rotating shaft;

[0011] One end of the one-way valve is connected to the inner cavity of the piston, and the other end is connected to the clutch oil cavity;

[0012] When the clutch oil chamber is pressurized, oil enters the clutch oil chamber from the oil passage and enters the one-way valve, which closes;

[0013] When the clutch oil chamber is depressurized, the spring resets and pushes the piston to reset, causing the oil close to the rotating shaft to be discharged from the oil channel and the one-way valve to open. The oil away from the rotating shaft is discharged from the one-way valve to flow to one side of the piston inner cavity.

[0014] Further, the one-way valve includes a valve body;

[0015] A steel ball is arranged in the inner cavity of the valve body and can move along the inner cavity of the valve body;

[0016] A small hole is provided at one end of the valve body, and the diameter of the small hole is smaller than the diameter of the steel ball; the size of the other end of the valve body is larger than the diameter of the steel ball, and a retainer is provided near the other end to limit the steel ball; the retainer is provided with a flow hole for oil circulation. If the retainer is not provided, other means of limiting can be used to prevent the steel ball from slipping out of the inner cavity of the valve body and allow liquid to pass through;

[0017] One end of the valve body faces the piston inner cavity during assembly, and the other end faces the clutch oil cavity.

[0018] Furthermore, the one-way valve includes a press-fitting port arranged at the other end of the valve body, the press-fitting port is a ring-shaped part, and the connection part between the press-fitting port and the valve body is an outer cone structure, the major diameter of the outer cone is larger than the inner diameter of the valve body, and the minor diameter is smaller than the inner diameter of the valve body; the distance from the connection part between the retainer and the valve body to the other end of the valve body is larger than the length of the press-fitting port, so as to accommodate the entire press-fitting port to be pressed into the interior of the valve body;

[0019] When assembling the check valve, the press-fit port is crimped into the valve body to expand the valve body, thereby enlarging the outer diameter of the check valve and fixing it in the piston.

[0020] Furthermore, the one-way valve includes protruding teeth arranged on the outer periphery of the valve body, and the protruding teeth are used for a tight connection between the one-way valve and the piston; the protruding teeth are a corrugated serrated structure arranged on the outer wall of the valve body.

[0021] Furthermore, there are at least two one-way valves.

[0022] Furthermore, there are four one-way valves, which are evenly distributed along the circumference of the piston and are used to balance the oil pressure.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] 1. The utility model is a wet clutch with a one-way valve. By arranging a one-way valve on the piston, the problem that the oil in the clutch oil chamber of the wet clutch is difficult to be quickly discharged after the gear is disengaged is solved, and the problem that the piston cannot be reset in time, which leads to the problem that the gear cannot be disengaged and the friction plate group is abnormally worn.

[0025] 2. The utility model provides a wet clutch with a one-way valve. The one-way valve is arranged at the edge of the clutch oil chamber away from the rotating axis, which is easy to install and has good sealing performance. The one-way valve is arranged on the piston corresponding to the edge position. The structure design is simple, the installation is convenient, and it is compatible with different types of wet clutches. It has certain scalability and low cost.

[0026] 3. The utility model is a wet clutch with a one-way valve. When the gear is engaged, the one-way valve will be in a completely closed state under the action of oil pressure, which can ensure the normal oil-filled clutch engagement. When the gear is disengaged, the one-way valve without the effect of oil pressure will be in an open state, and part of the oil in the clutch oil chamber away from the rotating shaft will be quickly discharged through the one-way valve. The working state of the one-way valve is cleverly controlled by oil pressure, so that the oil in the clutch oil chamber after the gear is disengaged can be quickly discharged without affecting the normal operation of the wet clutch, which fundamentally solves the problem of untimely piston resetting and inability to disengage the gear, thereby ensuring the accuracy and safety of the gear operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an existing wet clutch;

[0028] Figure 1 The reference numerals are as follows: 01-piston; 02-spring; 03-friction plate assembly; 04-clutch support; 05-clutch oil chamber; 06-oil channel.

[0029] Figure 2 It is a structural schematic diagram of a wet clutch with a one-way valve of the utility model;

[0030] Figure 3 It is a schematic diagram of the oil filling process of the embodiment of the utility model;

[0031] Figure 4 It is a schematic diagram of the oil discharge process of the embodiment of the utility model;

[0032] Figure 5 It is a structural schematic diagram of a one-way valve in an embodiment of the utility model;

[0033] Figure 6 It is a schematic diagram of the assembly of the one-way valve in the embodiment of the utility model.

[0034] Figure 2-Figure 6 The reference numerals are as follows: 1-piston; 2-spring; 3-friction plate group; 4-clutch support; 5-clutch oil chamber; 6-oil channel; 7-check valve, 71-steel ball, 72-valve body, 73-retaining frame, 74-pressing port, 75-protruding tooth. DETAILED DESCRIPTION

[0035] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] See also Figure 2 , a wet clutch with a one-way valve, comprising: a piston 1, a spring 2, a friction plate group 3, a clutch support 4, a clutch oil chamber 5, an oil channel 6, and a one-way valve 7;

[0037] The clutch support 4 is sleeved on the rotating shaft, and the piston 1 is arranged in the clutch support 4; the spring 2 and the friction plate group 3 are arranged on one side of the piston inner cavity in the piston 1;

[0038] The oil passage 6 is arranged in the clutch support 4 and communicates with the clutch inner cavity;

[0039] One side of the piston inner cavity of the piston 1 is connected to the friction plate group 3, and the other side forms a clutch oil chamber 5 with the clutch support 4;

[0040] Four one-way valves 7 are arranged on the outer side of the piston 1 away from the rotating axis and are evenly distributed along the circumference of the piston 1;

[0041] The one-way valve 7 includes a steel ball 71, a valve body 72, a retainer 73, a press-fitting port 74, and a protruding tooth 75;

[0042] The steel ball 71 is disposed in the inner cavity of the valve body 72 and can move along the inner cavity of the valve body;

[0043] One end of the valve body 72 is closed, with a small hole in the center, the diameter of which is smaller than the diameter of the steel ball 71, and the other end is open, with a size larger than the diameter of the steel ball 71;

[0044] The retainer 73 is arranged in the inner cavity of the valve body near the other end, and is used to limit the steel ball 71 to prevent it from falling out of the inner cavity of the valve body; the retainer 73 is provided with a flow hole for oil flow;

[0045] One end of the valve body 72 is in communication with the piston inner cavity, and the other end is in communication with the clutch oil chamber 5;

[0046] The press-fitting port 74 is provided at the other end of the valve body 72, and the protruding teeth 75 are provided at the outer periphery of the valve body 72;

[0047] The press-fitting port 74 is a metal annular part, and the connection portion between the press-fitting port 74 and the valve body 72 is an outer cone structure, the major diameter of the outer cone is larger than the inner diameter of the valve body 72, and the minor diameter is smaller than the inner diameter of the valve body 72; the distance from the connection portion between the retainer 73 and the valve body 72 to the other end of the valve body 72 is larger than the length of the press-fitting port 74;

[0048] When assembling the one-way valve 7, the press-fitting port 74 welded on the valve body 72 is crimped and installed into the inner cavity of the valve body 72, so that the valve body 72 expands and expands, thereby enlarging the outer diameter of the one-way valve 7, thereby fixing it in the piston 1, and engaging with the inner wall of the valve body 72 through the protruding teeth 75, thereby improving the installation strength between the one-way valve 7 and the piston 1 and making them fit tightly.

[0049] In other embodiments of the utility model, an annular groove for accommodating the press-fitting port 74 may be opened inwardly at the other end of the valve body 72 (in this case, the size of the press-fitting port 74 is adapted to the annular groove, rather than the inner diameter of the valve body 72). During assembly, the press-fitting port 74 welded on the valve body 72 is crimped into the annular groove of the valve body 72, thereby causing the valve body 72 to expand and expand, thereby achieving the same effect.

[0050] The cross-sectional area design of the one-way valve 7 in the utility model mainly depends on the oil discharge requirements of the pipeline, the size of the wet clutch, the size and distribution of the oil channel, etc., and is selected according to actual needs;

[0051] The number of the one-way valves 7 is generally designed to be evenly distributed (symmetrically distributed) along the circumference, mainly to balance the oil pressure and ensure that the force on the piston is balanced.

[0052] refer to Figure 5-Figure 6 , the principle of the utility model is as follows:

[0053] A one-way valve is set on the piston, and its position is at the edge of the clutch oil chamber away from the rotating axis. The working state of the one-way valve is determined by the oil pressure when the wet clutch is working:

[0054] When the wet clutch is working, the one-way valve 7 is in a closed state under the action of oil pressure, so the clutch oil chamber can be filled with oil and pressure can be built up. Under the action of oil pressure, the piston 1 presses the friction plate group 3, and the wet clutch is fully engaged and starts to transmit power.

[0055] When the wet clutch is closed, the clutch oil chamber loses pressure. At this time, the one-way valve 7 will open, and the part of the oil that is thrown to the side of the wet clutch oil chamber away from the rotating shaft under the action of inertia will be quickly discharged through the one-way valve. In this way, the wet clutch can quickly disengage and stop transmitting power, ensuring the accuracy and safety of gear operation.

[0056] refer to Figure 3-Figure 4 The specific working process of the embodiment of the utility model is as follows:

[0057] When the gear is engaged, the oil enters the clutch oil chamber 5 from the oil channel 6 and enters the one-way valve 7. The one-way valve 7 is closed under the action of oil pressure; the clutch oil chamber 5 continues to be filled with oil, the volume of the clutch oil chamber 5 expands, and the piston 1 pushes the spring 2 under the action of oil to tighten the friction plate group 3; when the piston 1 completely compresses the friction plate group 3, the gear is engaged.

[0058] When shifting gears, the oil pressure in the wet clutch is removed, and the spring 2, which has lost the effect of the oil pressure, rebounds and resets, pushing the piston 1 to reset, so that the oil close to the rotating shaft is discharged from the oil channel 6; after the oil pressure in the wet clutch is removed, the one-way valve 7 loses the effect of the oil and opens, and the remaining oil away from the rotating shaft is thrown to the side of the clutch oil chamber 5 away from the rotating shaft due to the inertial rotation, and will be discharged from the clutch oil chamber 5 through the opened one-way valve 7, and the piston 1 can be quickly reset, and the shifting of gears is completed.

[0059] The above description is only an embodiment of the utility model, and is not intended to limit the scope of protection of the utility model. Any equivalent structural transformation made by using the contents of the utility model specification and drawings, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the utility model. For ordinary technicians in this field, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A wet clutch with a one-way valve, comprising: A clutch support (4) sleeved on a rotating shaft, a piston (1) disposed in the clutch support (4), a spring (2) and a friction plate group (3) located on one side of a piston inner cavity in the piston (1), and an oil passage (6) disposed in the clutch support (4) and communicating with a clutch oil cavity (5); Features: A one-way valve (7) is provided on the outer side of the piston (1) away from the rotating shaft; One end of the one-way valve (7) is in communication with the inner cavity of the piston, and the other end is in communication with the clutch oil cavity (5); When the clutch oil chamber (5) is pressurized, oil enters the clutch oil chamber (5) from the oil passage (6) and enters the one-way valve (7), and the one-way valve (7) is closed; When the clutch oil chamber (5) is depressurized, the spring (2) is reset and pushes the piston (1) to reset, so that the oil near the rotating shaft is discharged from the oil passage (6), and the one-way valve (7) is opened, and the oil away from the rotating shaft is discharged from the one-way valve (7) and flows to one side of the piston inner chamber.

2. A wet clutch with a one-way valve according to claim 1, characterized in that: The one-way valve (7) comprises a valve body (72); A steel ball (71) is arranged in the inner cavity of the valve body (72) and can move along the inner cavity of the valve body; A small hole is provided at one end of the valve body (72), and the diameter of the small hole is smaller than the diameter of the steel ball (71); the size of the other end of the valve body (72) is larger than the diameter of the steel ball (71), and a retaining frame (73) is provided near the other end to limit the position of the steel ball (71); and the retaining frame (73) is provided with a flow hole for oil circulation; During assembly, one end of the valve body (72) faces the piston inner cavity, and the other end faces the clutch oil cavity (5).

3. A wet clutch with a one-way valve according to claim 2, characterized in that: The one-way valve (7) includes a press-fitting port (74) arranged at the other end of the valve body (72); the press-fitting port (74) is an annular part, and the connection portion between the press-fitting port and the valve body (72) is an outer cone structure, the major diameter of the outer cone is larger than the inner diameter of the valve body (72), and the minor diameter is smaller than the inner diameter of the valve body (72); the distance from the connection portion between the retaining frame (73) and the valve body (72) to the other end of the valve body (72) is greater than the length of the press-fitting port (74).

4. A wet clutch with a one-way valve according to claim 3, characterized in that: The one-way valve (7) comprises a protruding tooth (75) arranged on the outer periphery of the valve body (72), and the protruding tooth (75) is used for a tight connection between the one-way valve (7) and the piston (1).

5. A wet clutch with a one-way valve according to claim 4, characterized in that: There are at least two one-way valves (7).

6. A wet clutch with a one-way valve according to claim 5, characterized in that: There are four one-way valves (7) which are evenly distributed along the circumference of the piston (1).

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