Electro-hydraulic wet clutch and transmission system

Abstract

An electro-hydraulic wet clutch, comprising an input transmission member (10), an output transmission member (20), a clutch assembly (50), a piston (60), an outer hub (40), and a lubrication oil pathway (102). A lubrication cavity (902) is formed between the clutch assembly and the piston, the piston is provided with a piston lubrication oil outlet hole, the input transmission member and the output transmission member are coaxially arranged, the clutch assembly comprises a first portion and a second portion, the input transmission member is fixed to the first portion, the outer hub is respectively fixedly connected to the second portion and the output transmission member, the piston is movably arranged to engage or disengage the clutch assembly, and the outer hub is provided with a second lubrication oil outlet hole (h). When the clutch assembly is engaged, the lubrication oil pathway is communicated with the lubrication cavity by means of the piston lubrication oil outlet hole, and the piston lubrication oil outlet hole is aligned with or partially staggered from the second lubrication oil outlet hole. The electro-hydraulic wet clutch can constantly maintain a sufficiently large oil passageway with the second lubrication oil outlet hole throughout the entire process of mutual wear and tear between the first portion and the second portion of the clutch assembly. Also provided is a transmission system.

Description

Electro-hydraulic wet clutch and transmission system TECHNICAL FIELD

[0001] The present application relates to the technical field of wet clutch structure, in particular to an electro-hydraulic wet clutch and transmission system. BACKGROUND

[0002] The clutch is a very important component in the mechanical transmission system, which is used to transmit and cut off the power from the engine to the gearbox and power output device, and prevent the parts from being damaged when the transmission system and power output device are overloaded. It is widely used in the fields of agricultural machinery, engineering machinery and hybrid electric vehicles. The wet clutch is a clutch that uses oil to cool the friction surface. The heat generated by sliding friction during engagement can be carried away by the cooling oil at any time, thereby effectively controlling the temperature of the friction surface and significantly reducing the wear of the friction surface. It is widely used in the transmission systems of agricultural machinery, engineering machinery and hybrid electric vehicles.

[0003] In a wet clutch, the wet clutch is lubricated through a lubricating hole. TECHNICAL PROBLEM

[0004] As the friction plate and the steel plate of the wet clutch wear out, the lubricating hole may be closed or partially closed due to the increase of the gap between the friction plate and the steel plate caused by wear, which changes the position of the lubricating hole and causes the lubricating oil to be unable to enter the lubricating hole or the amount of lubricating oil to be insufficient, thereby causing the transmission system to heat up. TECHNICAL SOLUTION

[0005] Therefore, the present application provides an electro-hydraulic wet clutch and transmission system, which can ensure sufficient size of the lubricating hole of the clutch assembly before and after the first part and the second part of the clutch assembly wear out, thereby greatly improving the performance of agricultural machinery, engineering machinery and hybrid electric vehicles.

[0006] An electro-hydraulic wet clutch comprises an input transmission member, an output transmission member, a clutch assembly, a piston, an outer hub and a lubricating oil passage; wherein the input transmission member and the output transmission member are coaxially arranged, the clutch assembly comprises a first part and a second part, the input transmission member is fixedly connected to the first part, the outer hub is fixedly connected to the second part and the output transmission member respectively, and the piston is movably arranged to push the first part and the second part to be close or to separate the first part and the second part, so as to make the clutch assembly engage or separate; a lubricating cavity is formed between the clutch assembly and the piston, N piston lubricating oil outlet holes are formed on the piston, a second lubricating oil outlet hole is arranged on the outer hub, the piston lubricating oil outlet holes can be connected with or disconnected from the lubricating oil passage through the second lubricating oil outlet hole; when the clutch assembly engages, the lubricating oil passage is connected to the lubricating cavity through n1 piston lubricating oil outlet holes, part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole when the clutch assembly is in a non-wearing state, and the part staggered with the second lubricating oil outlet hole is away from the input transmission member, or the n1 piston lubricating oil outlet holes are aligned with the second lubricating oil outlet hole, or part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole, and the part staggered with the second lubricating oil outlet hole is close to the input transmission member; wherein N is a positive integer greater than or equal to 2; n1 is a positive integer greater than or equal to 1 and less than or equal to N.

[0007] In an embodiment, when the clutch assembly separates, the lubricating oil passage is connected to the lubricating cavity through n2 piston lubricating oil outlet holes, the total cross-sectional area of the n1 piston lubricating oil outlet holes is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes; wherein n2 is a positive integer greater than or equal to 1 and less than N; when the clutch assembly engages and part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole, the cross-sectional area of the part of the n1 piston lubricating oil outlet holes aligned with the second lubricating oil outlet hole is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes.

[0008] In an embodiment, first and second piston lubricating oil outlet holes are formed on the piston, and the first and second piston lubricating oil outlet holes are selectively connected with the lubricating oil passage or simultaneously connected with the lubricating oil passage; when the clutch assembly separates, the lubricating oil passage is selectively connected to the lubricating cavity through the first and second piston lubricating oil outlet holes; when the clutch assembly engages, the lubricating oil passage is selectively connected to the lubricating cavity through the first and second piston lubricating oil outlet holes or simultaneously connected to the lubricating cavity through the first and second piston lubricating oil outlet holes.

[0009] In an embodiment, the cross-sectional area of the first piston lubricating oil outlet hole is smaller than the cross-sectional area of the second piston lubricating oil outlet hole; when the clutch assembly separates, the lubricating oil passage is connected to the lubricating cavity through the first piston lubricating oil outlet hole; when the clutch assembly engages, the lubricating oil passage is connected to the lubricating cavity through the second piston lubricating oil outlet hole.

[0010] In an embodiment, when the lubricating oil passage is communicated with the lubricating cavity through the second piston lubricating oil outlet hole, the second piston lubricating oil outlet hole is partially misaligned with the second lubricating oil outlet hole, and the part misaligned with the second lubricating oil outlet hole and the first piston lubricating oil outlet hole are located on two sides of the lubricating oil passage, respectively, and the cross-sectional area of the part of the second piston lubricating oil outlet hole aligned with the second lubricating oil outlet hole is greater than the cross-sectional area of the first piston lubricating oil outlet hole; or, when the lubricating oil passage is communicated with the lubricating cavity through the second piston lubricating oil outlet hole, the second piston lubricating oil outlet hole is aligned with the second lubricating oil outlet hole; or, when the lubricating oil passage is communicated with the lubricating cavity through the second piston lubricating oil outlet hole, the second piston lubricating oil outlet hole is partially misaligned with the second lubricating oil outlet hole, and the part misaligned with the second lubricating oil outlet hole and the first piston lubricating oil outlet hole are located on the same side of the lubricating oil passage, respectively, and the cross-sectional area of the part of the second piston lubricating oil outlet hole aligned with the second lubricating oil outlet hole is greater than the cross-sectional area of the first piston lubricating oil outlet hole.

[0011] In an embodiment, the electro-hydraulic wet clutch further comprises a brake assembly, the brake assembly comprising a third part and a fourth part, the third part being fixedly connected to the output transmission member, and the fourth part being fixedly connected to the mounting box; the side of the piston is provided with a sliding member, the sliding member being used for abutting against the side of the brake assembly, so that the third part and the fourth part are tightly attached when the clutch assembly is separated, and the third part and the fourth part are separated when the clutch assembly is engaged, thereby making the brake assembly engaged or separated; when the clutch assembly is separated and the brake assembly is engaged, the lubricating oil passage is communicated with the lubricating cavity through the n2 piston lubricating oil outlet holes; when the clutch assembly is engaged and the brake assembly is separated, the lubricating oil passage is communicated with the lubricating cavity through the n1 piston lubricating oil outlet holes, the n1 piston lubricating oil outlet holes are partially misaligned with or aligned with the second lubricating oil outlet hole, and when the n1 piston lubricating oil outlet holes are partially misaligned with the second lubricating oil outlet hole, the cross-sectional area of the part of the n1 piston lubricating oil outlet holes aligned with the second lubricating oil outlet hole is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes.

[0012] In an embodiment, the lubricating oil passage enters the output transmission member along the side of the output end of the output transmission member, and then passes through the output transmission member and the outer hub in the direction parallel to the axis of the output transmission member and the direction perpendicular to the axis of the output transmission member, respectively, to be communicated with the lubricating cavity and the brake assembly, respectively.

[0013] In an embodiment, the clutch assembly further comprises an inner hub, the inner hub being fixedly connected to the input transmission member, the clutch assembly being movably connected to the inner hub in the axial direction, the first part being fixedly connected to the inner hub in the circumferential direction, and the second part being fixedly connected to the outer hub in the circumferential direction; the piston comprises a piston sleeve, the piston sleeve being sleeved on the outer hub, and an elastic assembly is arranged between the piston and the inner hub, the elastic assembly being used for providing a force for driving the first part and the second part of the clutch assembly to be separated.

[0014] In an embodiment, the piston lubricating oil outlet holes are spaced apart on the piston sleeve.

[0015] Based on the same concept of the foregoing application, the application further provides a transmission system, which can be provided with the electro-hydraulic wet clutch as described above. Advantages

[0016] The electro-hydraulic wet clutch, the transmission system and the agricultural machinery provided by the application are provided with a plurality of piston lubrication oil outlet holes, when the clutch assembly is engaged, n1 piston lubrication oil outlet holes are aligned or partially staggered with the second lubricating oil outlet hole, so that the first part and the second part of the clutch assembly can always maintain a large enough oil passage with the second lubricating oil outlet hole during the whole process of mutual wear, thereby greatly improving the performance of agricultural machinery, engineering machinery and hybrid electric vehicles. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Fig. 1 and Fig. 2 respectively schematically show the overall structure of the electro-hydraulic wet clutch of the embodiment of the application from different perspectives.

[0019] Fig. 3 schematically shows the overall cross-sectional structure of the electro-hydraulic wet clutch of the embodiment of the application.

[0020] Fig. 4 schematically shows the oil distribution structure of the embodiment of the application.

[0021] Fig. 5 schematically shows the influence of piston movement on the first piston lubrication oil outlet hole and the second piston lubrication oil outlet hole in the embodiment of the application.

[0022] Fig. 6 schematically shows the structure of the clutch assembly in the embodiment of the application.

[0023] Fig. 7 schematically shows the structure of the elastic assembly in the embodiment of the application.

[0024] Fig. 8 schematically shows the structure of the brake assembly in the embodiment of the application.

[0025] Fig. 9 schematically shows the first pressure relief mechanism in the embodiment of the application.

[0026] Fig. 10 schematically shows the second pressure relief mechanism in the embodiment of the application.

[0027] Fig. 11 schematically shows the second structure of the sliding member in the embodiment of the application.

[0028] Fig. 12 schematically shows the cross-sectional structure of Fig. 11.

[0029] Figure 13 schematically shows the effect of piston movement on the second pressure relief mechanism in an embodiment of the application.

[0030] Figure 14 schematically shows a third pressure relief mechanism in an embodiment of the application.

[0031] Figure 15 schematically shows a third structure of the slide in an embodiment of the application.

[0032] Figure 16 schematically shows the cross-sectional structure of Figure 15.

[0033] Figure 17 schematically shows the effect of piston movement on the third pressure relief mechanism in an embodiment of the application. Embodiments of the application

[0034] Certain embodiments of the application will now be described in detail with reference to the drawings. It is obvious that the described embodiments are only some of the embodiments of the application and do not limit the application in any way. As a person of ordinary skill in the art will readily recognize from the disclosure herein, other embodiments that are widely different from those described herein, but that incorporate the various features of the application are also within the scope of the application.

[0035] In the description of the application, unless otherwise clearly specified and limited, the terms "set", "have", "install", "connect" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium. The specific meanings of the above terms can be understood according to the specific circumstances by those of ordinary skill in the art.

[0036] The terms "upper", "inner", "one side", "two sides", "inner side", "side", "outer side" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0037] The terms "first", "second", "third", "fourth" and the like are only used to distinguish similar attributes of elements, and do not indicate or imply relative importance or a particular order.

[0038] The term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, in addition to the listed elements, other elements that are not explicitly listed can also be included.

[0039] As shown in FIGS. 1-4, the electro-hydraulic wet clutch of the embodiment of the present application comprises an input transmission member 10, an output transmission member 20, a clutch assembly 50, a piston 60, an outer hub 40 and a lubricating oil passage 102; wherein the input transmission member 10 and the output transmission member 20 are coaxially arranged, the clutch assembly 50 comprises a first part and a second part, the input transmission member 10 is fixedly connected to the first part, the outer hub 40 is fixedly connected to the second part and the output transmission member 20 respectively, and the piston 60 is movably arranged to push the first part and the second part to be close or to be separated, so as to make the clutch assembly 50 engage or separate; a lubricating cavity 902 is formed between the clutch assembly 50 and the piston 60, N piston lubricating oil outlet holes are formed on the piston 60, a second lubricating oil outlet hole h is arranged on the outer hub 40, the piston lubricating oil outlet holes can be communicated with or disconnected from the lubricating oil passage 102 through the second lubricating oil outlet hole h; when the clutch assembly 50 engages, the lubricating oil passage 102 is communicated with the lubricating cavity 902 through n1 piston lubricating oil outlet holes, part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole h when the clutch assembly 50 is in a non-wearing state, and the part away from the input transmission member 10 is staggered with the second lubricating oil outlet hole h, the n1 piston lubricating oil outlet holes are aligned with the second lubricating oil outlet hole h when the clutch assembly 50 is in a wearing state, or part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole h, and the part close to the input transmission member 10 is staggered with the second lubricating oil outlet hole h. When the clutch assembly 50 separates, the lubricating oil passage 102 is communicated with the lubricating cavity 902 through n2 piston lubricating oil outlet holes; when the clutch assembly 50 engages and part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole h, the cross-sectional area of the part of the n1 piston lubricating oil outlet holes aligned with the second lubricating oil outlet hole h is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes; wherein N is a positive integer greater than or equal to 2; n1 is a positive integer greater than or equal to 1 and less than or equal to N; n2 is a positive integer greater than or equal to 1 and less than N; the total cross-sectional area of the n1 piston lubricating oil outlet holes is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes.

[0040] The electro-hydraulic wet clutch of the embodiment of the present application is provided with a plurality of piston lubricating oil outlet holes, one or more piston lubricating oil outlet holes are communicated with lubricating oil when the clutch assembly 50 engages, so as to increase the lubricating oil flow passage cross-sectional area of the piston 60, thereby increasing the lubricating oil flow rate flowing into the clutch assembly 50. Since the n1 piston lubricating oil outlet holes are partially staggered or aligned with the second lubricating oil outlet hole h when the clutch assembly 50 engages, the first part and the second part of the clutch assembly 50 can always maintain a large enough oil passage with the second lubricating oil outlet hole h throughout the whole process of mutual wear of the first part and the second part, thereby greatly improving the performance of agricultural machinery, engineering machinery and hybrid electric vehicles.

[0041] As shown in FIG. 3 and FIG. 4, in an embodiment, the first piston lubrication oil outlet hole i and the second piston lubrication oil outlet hole j are formed on the piston 60, and the first piston lubrication oil outlet hole i and the second piston lubrication oil outlet hole j are selectively or simultaneously communicated with the lubricating oil passage 102; when the clutch assembly 50 is separated, the lubricating oil passage 102 is selectively communicated with the lubricating cavity 902 through the first piston lubrication oil outlet hole i and the second piston lubrication oil outlet hole j; when the clutch assembly 50 is engaged, the lubricating oil passage 102 is selectively communicated with the lubricating cavity 902 through the first piston lubrication oil outlet hole i and the second piston lubrication oil outlet hole j or simultaneously communicated with the lubricating cavity 902 through the first piston lubrication oil outlet hole i and the second piston lubrication oil outlet hole j.

[0042] As shown in FIG. 3 and FIG. 4, in an embodiment, the sectional area of the first piston lubrication oil outlet hole i is smaller than the sectional area of the second piston lubrication oil outlet hole j; when the clutch assembly 50 is separated, the lubricating oil passage 102 is communicated with the lubricating cavity 902 through the first piston lubrication oil outlet hole i; when the clutch assembly 50 is engaged, the lubricating oil passage 102 is communicated with the lubricating cavity 902 through the second piston lubrication oil outlet hole j.

[0043] As shown in FIG. 5, in an embodiment, when the lubricating oil passage 102 is communicated with the lubricating cavity 902 through the second piston lubrication oil outlet hole j, part of the second piston lubrication oil outlet hole j is misaligned with the second lubrication oil outlet hole h, and the part misaligned with the second lubrication oil outlet hole h and the first piston lubrication oil outlet hole i are respectively located on two sides of the second lubrication oil outlet hole h, the sectional area of the part of the second piston lubrication oil outlet hole j aligned with the second lubrication oil outlet hole h is greater than the sectional area of the first piston lubrication oil outlet hole i; or, when the lubricating oil passage 102 is communicated with the lubricating cavity 902 through the second piston lubrication oil outlet hole j, the second piston lubrication oil outlet hole j is aligned with the second lubrication oil outlet hole h; or, when the lubricating oil passage 102 is communicated with the lubricating cavity 902 through the second piston lubrication oil outlet hole j, part of the second piston lubrication oil outlet hole j is misaligned with the second lubrication oil outlet hole h, and the part misaligned with the second lubrication oil outlet hole h and the first piston lubrication oil outlet hole i are respectively located on the same side of the second lubrication oil outlet hole h, the sectional area of the part of the second piston lubrication oil outlet hole j aligned with the second lubrication oil outlet hole h is greater than the sectional area of the first piston lubrication oil outlet hole i.

[0044] As shown in FIGS. 1-3, in an embodiment, the electro-hydraulic wet clutch further comprises a brake assembly 80; the brake assembly 80 comprises a third part and a fourth part, the third part is fixedly connected to the output transmission member 20, the fourth part is fixedly connected to the mounting box, the side of the piston 60 is provided with a sliding piece 61, the sliding piece 61 is used to abut against the side of the brake assembly 80, so that the third part and the fourth part are tightly attached when the clutch assembly 50 is separated, and the third part and the fourth part are separated when the clutch assembly 50 is engaged, so as to make the brake assembly 80 engage or separate; when the clutch assembly 50 is separated and the brake assembly 80 is engaged, the lubricating oil passage 102 is communicated with the lubricating cavity 902 through n2 piston lubricating oil outlets; when the clutch assembly 50 is engaged and the brake assembly 80 is separated, the lubricating oil passage 102 is communicated with the lubricating cavity 902 through n1 piston lubricating oil outlets, the n1 piston lubricating oil outlets are partially staggered or aligned with the second lubricating oil outlet h, when the n1 piston lubricating oil outlets are partially staggered with the second lubricating oil outlet h, the cross-sectional area of the part of the n1 piston lubricating oil outlets aligned with the second lubricating oil outlet h is greater than the total cross-sectional area of the n2 piston lubricating oil outlets; wherein N is a positive integer greater than or equal to 2; n2 is a positive integer greater than or equal to 1 and less than N; n2 is a positive integer greater than or equal to 1 and less than or equal to N; the total cross-sectional area of the n1 piston lubricating oil outlets is greater than the total cross-sectional area of the n2 piston lubricating oil outlets. Therefore, the flow can be reasonably distributed according to the friction heat generation of the clutch assembly and the brake assembly, the reliability of the wet clutch is improved, and the complexity of the structure and assembly of the wet clutch is not increased, and the wet clutch can always have a large enough oil passage with the second lubricating oil outlet h throughout the whole process of mutual wear of the clutch plate and the clutch friction plate, so as to ensure that the wet clutch always has sufficient oil flow during the engagement process. Specifically, the free end of the sliding piece 61 is sleeved with a brake return elastic member 64, and the brake return elastic member 64 is a spring structure.

[0045] As shown in FIG. 4, in an embodiment, the cross-sectional area of the first piston lubricating oil outlet i is A1, and the through flow is Q1; the cross-sectional area of the second piston lubricating oil outlet j is A2, and the through flow is Q2; the cross-sectional area of the first lubricating oil outlet f of the lubricating oil passage 102 is A3, and the through flow is Q3; the through flow of the lubricating oil inlet hole b of the lubricating oil passage 102 is Q; then when the clutch assembly 50 is separated:

[0046] ;

[0047] ;

[0048] then

[0049] ;

[0050] ;

[0051] Q3≥Q 3min wherein Q 3min is the minimum lubrication flow required for the heat dissipation of the brake assembly 80;

[0052] When the clutch assembly (50) is engaged:

[0053] ;

[0054] ;

[0055] then

[0056] ;

[0057] ;

[0058] Q2≥Q 2min wherein Q 2min is the minimum lubrication flow required for the heat dissipation of the clutch assembly 50.

[0059] For example: let Q = 20 L / min, A1 = 2 mm 2 , A2 = 20 mm 2 , A3 = 3 mm 2 , Q 2min = 17.14 L / min,

[0060] Q 3min = 2.56 L / min, then when the clutch is disengaged: Q1 = 12.48 L / min, Q3 = 7.52 L / min > 2.56 L / min, and when the clutch is engaged: Q2 = 18.29 L / min > 17.14 L / min, Q3 = 1.71 L / min.

[0061] Specifically, two lubrication oil outlets are arranged on the piston 60, the lubrication oil outlet with a larger cross-sectional area is used to pass lubricating oil when the electro-hydraulic wet clutch is engaged, and the lubrication oil outlet with a smaller cross-sectional area is used to pass lubricating oil when the electro-hydraulic wet clutch is disengaged, so that the flow can be reasonably distributed according to the friction heat generation of the clutch assembly 50, and the reliability of the wet clutch is improved. The lubrication oil outlet with a larger cross-sectional area on the piston 60 can always maintain a large enough oil passage with the second lubrication oil outlet h during the whole process of mutual abrasion between the first part, i.e., the clutch plate 51, and the second part, i.e., the clutch friction plate 52, so as to ensure that the wet clutch always has sufficient oil flow during the engagement process. Therefore, the flow can be reasonably distributed according to the friction heat generation of the clutch assembly 50, and the stability of the wet clutch is improved, and the complexity of the structure and assembly of the wet clutch is not increased.

[0062] In an embodiment not shown, when the clutch assembly 50 is separated, the lubricating oil path 102 is communicated with the lubricating cavity 902 through the first piston lubricating oil outlet hole i or the second piston lubricating oil outlet hole j, and when the clutch assembly 50 is engaged, the lubricating oil path 102 is communicated with the lubricating cavity 902 through the first piston lubricating oil outlet hole i and the second piston lubricating oil outlet hole j simultaneously. Two lubricating oil outlet holes are arranged on the piston, and when the electro-hydraulic wet clutch is engaged, the two lubricating oil outlet holes are communicated with the lubricating oil, and when the electro-hydraulic wet clutch is separated, only one lubricating oil outlet hole is communicated with the lubricating oil, so that the flow rate can be reasonably distributed according to the friction heat generated by the clutch assembly, and the reliability of the electro-hydraulic wet clutch is improved

[0063] As shown in FIG. 3, in an embodiment, the clutch assembly 50 further comprises an inner hub 30, the inner hub 30 is fixedly connected to the input transmission member 10, the clutch assembly 50 is movably connected to the inner hub 30 along the axial direction, the first part is fixedly connected to the inner hub 30 along the circumferential direction, and the second part is fixedly connected to the outer hub 40 along the circumferential direction; the piston 60 comprises a piston sleeve 65, the piston sleeve 65 is sleeved on the outer hub 40, and the elastic assembly 70 is arranged between the piston 60 and the inner hub 30, and the elastic assembly 70 is used to provide a force for driving the first part and the second part of the clutch assembly 50 to separate.

[0064] As shown in FIG. 3, in an embodiment, the piston lubricating oil outlet holes are arranged on the piston sleeve 65. This arrangement is easy to process and manufacture, and has a simple structure, which facilitates the connection of different piston lubricating oil outlet holes to the outer hub 40 and the lubricating cavity 902.

[0065] As shown in FIG. 3 and FIG. 4, in an embodiment, the lubricating oil path 102 enters the output transmission member 20 along the output end side of the output transmission member 20, and then passes through the output transmission member 20 and the outer hub 40 along the direction parallel to the axis of the output transmission member 20 and the direction perpendicular to the axis of the output transmission member 20 respectively to be communicated with the lubricating cavity 902 and the brake assembly 80. Specifically, the above-mentioned lubricating oil path 102 has a simple and compact structure, is easy to process and manufacture, and can improve the flow efficiency of each oil path respectively.

[0066] As shown in FIG. 6, in an embodiment, the first part is a clutch plate 51, the second part is a clutch friction plate 52, and the clutch assembly further comprises a first elastic member 53, a positioning member 54, and a separation elastic member 55; wherein the clutch plate 51, the clutch friction plate 52, and the first elastic member 53 are alternately movably sleeved on the inner hub 30, the outer periphery of the clutch plate 51 is circumferentially embedded in the outer hub 40, and the inner periphery of the clutch friction plate 52 is circumferentially embedded in the outer hub 40; or the positioning member 54 is penetratingly arranged in the clutch plate 51 or the clutch friction plate 52 along the direction parallel to the axis of the input transmission member 10, the two ends of the positioning member 54 are respectively fixedly connected to the side portions of the inner hub 30 and the outer hub 40, the two ends of the positioning member 54 are sleeved with a first elastic support member 56, the first elastic support member 56 is used to pre-tighten the end portions of the positioning member 54, and the separation elastic member 55 is arranged between two adjacent clutch plates 51 or two adjacent clutch friction plates 52.

[0067] The side of the clutch assembly 50 close to the inner hub 30 is sequentially provided with an adjusting plate 57 and a first elastic stop ring 58 from inside to outside. Specifically, the clutch plate 51 and the adjusting plate 57 are steel plates, the first elastic member 53 is a wave spring, the positioning member 54 is a positioning rubber rod, the separation elastic member 55 is a separation spring, and the first elastic support member 56 is a pre-tightening spring. Specifically, the wave spring is arranged between the clutch plate 51 and the clutch friction plate 52, when the wet clutch is separated, the clutch plate 51 and the clutch friction plate 52 are completely and uniformly separated, the rotation of the output transmission member 20 can be quickly stopped, and the stability and reliability of the separation process are improved. The positioning rubber rod and the separation spring are arranged in the circumferential direction of the clutch plate 51, the positioning rubber rod can improve the coaxiality between the clutch plates 51, improve the stability of the engagement and separation process of the clutch assembly 50, and the separation spring can make the separation process more uniform, complete and improve the separation response speed. It is easily understood that in some embodiments not shown, the type and position of the first elastic member 53 between the clutch plate 51 and the clutch friction plate 52 can be adjusted according to the actual situation, and the positioning member 54 and the separation elastic member 55 on the clutch plate 51 can also be arranged on the clutch friction plate 52 or other positions of the clutch plate 51.

[0068] Specifically, assuming that the thickness of the clutch plate 51 is h1, the thickness of the clutch friction plate 52 is h2, the average gap between the clutch plate 51 and the clutch friction plate 52 in the separation state of the clutch assembly 50 is λ, and the thickness H of the adjusting plate 57 is H = h1 + h2 + λ, the adjusting plate 57 can be replaced by a pair of clutch plate 51 and clutch friction plate 52, and the thickness of the adjusting plate 57 can also be set as the sum of the thicknesses and average gaps of multiple pairs of clutch plate 51 and clutch friction plate 52, so as to improve the output torque of the entire wet clutch to adapt to higher power agricultural machinery, vehicles or engineering machinery.

[0069] As shown in FIG. 7, in an embodiment, the elastic assembly 70 comprises a return spring 71, an elastic piece baffle 72 and a second elastic baffle 73; wherein the return spring 71 is movably sleeved on the piston 60 along the axial direction of the output transmission member 20, and the elastic piece baffle 72 and the second elastic baffle 73 are fixedly sleeved on the outer hub 40 from inside to outside. Specifically, the return spring 71 is in a spring structure. The elastic assembly with the above structure is easy to arrange and install, simple and compact in structure, and facilitates the application of elastic force to the piston 60 to stably and reliably realize the resetting of the piston 60.

[0070] As shown in FIG. 8, in an embodiment, the third part of the brake assembly 80 is a brake piece 81, the fourth part of the brake assembly 80 is a brake friction piece 82, and the brake assembly 80 further comprises a second elastic piece 83; wherein the brake piece 81, the brake friction piece 82 and the second elastic piece 83 are alternately movably sleeved on one end of the outer hub 40 away from the inner hub 30, and the outer side of the brake assembly 80 is provided with a third elastic baffle 84 fixedly sleeved on the outer hub 40. Specifically, the brake piece 81 is a steel piece, and the second elastic piece 83 is a wave spring. Specifically, the wave spring is arranged between the brake piece 81 and the brake friction piece 82, and when the wet clutch is engaged, the brake piece 81 and the brake friction piece 82 are completely and uniformly separated, which reduces the energy loss of the brake assembly 80 and improves the transmission efficiency during the engagement process.

[0071] As shown in FIGS. 3 and 4, in an embodiment, the working oil passage 101 enters the output transmission member 20 along the end of the output transmission member 20, and then passes through the output transmission member 20 and the outer hub 40 in the direction parallel to the axis of the output transmission member 20 and the direction perpendicular to the axis of the output transmission member 20 to be communicated with the working oil cavity 901, i.e., the position close to the inner side of the outer hub 40. Specifically, the working oil passage 101 is arranged in the above manner, which is simple and compact in structure, easy to process and manufacture, and can respectively improve the flow efficiency of each oil passage.

[0072] As shown in FIGS. 3 and 4, specifically, the outer hub 40 comprises a first outer hub 41 and a second outer hub 42 fixedly connected with each other.

[0073] As shown in FIG. 3, in an embodiment, the inner hub 30 is provided with a mounting sleeve 31, the clutch assembly 50 is sleeved on the mounting sleeve 31, and the mounting sleeve 31 is provided with lubricating holes 32 at intervals. The lubricating holes 32 arranged at intervals on the mounting sleeve 31 can further realize uniform lubrication and cooling of the clutch assembly 50.

[0074] As shown in FIG. 3, in an embodiment, the sliding piece 61 is arranged along the direction parallel to the axis of the output transmission member 20, the sliding piece 61 is symmetrically arranged relative to the axis of the output transmission member 20, the second elastic support 62 is sleeved on the sliding piece 61, the second elastic support 62 is a pre-tightening spring, the pre-tightening spring is used to pre-tighten the sliding piece 61, so that the sliding piece 61 is always connected to the outer hub 40. Specifically, the sliding piece 61 can also serve as a positioning piece between the piston 60 and the brake assembly 80, the piston 60 and the first outer hub 41 are positioned and connected through the sliding piece 61, the pre-tightening spring is matched on the sliding piece 61 to pre-tighten the sliding piece 61, the sliding piece 61 is always connected to the piston 60 and the first outer hub 41, the coaxiality between the piston 60 and the first outer hub 41 can be improved, and the reciprocating motion of the piston 60 is stable, reliable and without inclination.

[0075] As shown in FIG. 3, in an embodiment, the input transmission member 10 is sleeved with the first bearing 11, the first bearing 11 is embedded in the bearing seat 12, the bearing seat 12 is fixedly connected to the first part of the box body, the outer hub 40 is sleeved with the second bearing 43, the second bearing 43 is fixedly connected to the second part of the box body, the output transmission member 20 is sleeved with the third bearing 21, the third bearing 21 is fixedly connected to the third part of the box body, and the first part of the box body, the second part of the box body and the third part of the box body are sequentially fixedly connected.

[0076] To realize the assembly of the electro-hydraulic wet clutch: (1) weld the first outer hub 41 and the second outer hub 42 together by an electronic speed welder, install a sealing ring on the piston 60 and the second outer hub 42, install a pre-tightening spring matched with the sliding piece 61 on the second outer hub 42, install the sliding piece 61 into the piston 60, and realize positioning through the sliding piece 61; (2) use a tool to compress the return elastic piece 71, install the elastic piece baffle 72, and then install the second elastic baffle 73 for axial limiting; (3) install the fourth bearing 13, i.e. the thrust needle bearing, on the inner hub 30, match the inner hub 30 with the second outer hub 42, alternately install the clutch plate 51, the first elastic piece 53 and the clutch friction plate 52, install the positioning piece 54 and the matched separation elastic piece 55, install the adjusting plate 57, use a tool to compress, and then install the first elastic baffle 58 for axial limiting; (4) alternately install the brake plate 81, the second elastic piece 83 and the brake friction plate 82 on the second outer hub 42, use a tool to compress, and then install the third elastic baffle 84 for axial limiting; (5) embed the first bearing 11 into the bearing seat 12, the first bearing 11 is a deep groove ball bearing, the input transmission member 11 (i.e. the input shaft) is matched with the first bearing 11, and the bearing seat 12 is connected with the first part of the box; (6) install the second bearing 43 on the second part of the box, the second bearing 43 is a first cylindrical roller bearing, the second outer hub 42 is matched with the second bearing 43, the second part of the box is connected with the first part of the box, and the input transmission member 10 is connected with the inner hub 30 through splines; (7) install the third bearing 21 on the third part of the box, the third bearing 21 is a second cylindrical roller bearing, the inner ring of the second cylindrical roller bearing is installed into the output transmission member 20 (i.e. the output shaft), the third part of the box is connected with the second part of the box, and the output transmission member 20 is connected with the second outer hub 42 through splines. Therefore, the three parts of the wet clutch are fixed on the box, the part boxes are connected in sequence, the assembly of the wet clutch is indirectly realized, the assembly difficulty of the wet clutch is reduced, and the assembly precision and reliability of the wet clutch are improved.

[0077] As shown in FIGS. 3-5, specifically, the working principle of the electro-hydraulic wet clutch of the embodiment of the application is as follows: the shaft-shaped input transmission member 10 is always provided with input rotation speed and input torque by the engine, the input transmission member 10 is connected with the inner hub 30 through the spline and drives the inner hub 30 to rotate, the inner hub 30 is embedded with the clutch friction plate 52 along the circumferential direction through the spline groove and the spline fitting structure and drives the clutch friction plate 52 to rotate. When the working oil cavity 901 is filled with oil, the piston 60 extrudes the clutch assembly 50, at this time, the clutch friction plate 52 and the clutch plate 51 are tightly attached along the axial direction and drive the clutch plate 51 to rotate, and the clutch plate 51 is embedded in the first outer hub 41 in the outer hub 40 along the circumferential direction through the spline and the spline groove fitting structure and drives the first outer hub 41 to rotate, the first outer hub 41 and the second outer hub 42 are connected together through the electronic speed welding, the second outer hub 42 is connected with the shaft-shaped output transmission member 20 through the spline and the spline groove fitting structure and drives the output transmission member 20 to rotate and output the rotation speed and torque. When the working oil cavity 901 is discharged, under the action of the return elastic member 71, the piston 60 returns to the initial position, the clutch friction plate 52 and the clutch plate 51 are separated under the action of the first elastic member 53, and the clutch friction plate 52 cannot transmit the rotation speed and torque to the clutch plate 51. The sliding member 61 extrudes the brake assembly 80 under the action of the piston 60 returning to the original position, at this time, the brake plate 81 and the brake friction plate 82 are tightly attached along the axial direction, and the brake plate 81 is braked by the brake friction plate 82 because the brake friction plate 82 has been circumferentially limited by the box. The brake plate 81 is connected with the second outer hub 42 through the spline and the spline groove fitting structure and brakes the second outer hub 42, and the second outer hub 42 is connected with the output transmission member 20 through the spline and the spline groove fitting structure and brakes the output transmission member 20. In this way, when the wet clutch is separated, the brake can be implemented synchronously, the output transmission member 20 is stopped, and the generation of undesirable operation is prevented. When the working oil cavity 901 is filled with oil, the sliding member 61 is separated from the brake plate 81 with the piston 60, the brake plate 81 and the brake friction plate 82 are also separated under the action of the second elastic member 83, and the brake effect is not generated, which has no influence on the transmission efficiency of the wet clutch.

[0078] In order to realize the engagement of the wet clutch, the working oil needs to be introduced into the working oil cavity 901 to make the piston 60 move, at this time, the clutch plate 51 and the clutch friction plate 52 will be tightly attached. When the wet clutch is separated, the piston 60 returns to the initial position, and the brake plate 81 and the brake friction plate 82 will be tightly attached. A large amount of heat will inevitably be generated in the clutch plate 51 and the clutch friction plate 52 during the engagement process, and a part of heat will also be generated in the brake plate 81 and the brake friction plate 82 during the braking process, at this time, sufficient lubricating and cooling oil is needed to improve the friction environment and dissipate heat. In order to realize the movement of the piston 60 and the lubrication and cooling of the clutch plate 51 and the clutch friction plate 52 and the brake plate 81 and the brake friction plate 82, the working oil hole and the lubricating and cooling oil hole need to be respectively arranged.

[0079] The setting of the working oil hole and the lubricating and cooling oil hole can be seen from Fig. 4. In order to realize the movement of the piston 60, the working oil enters the working oil hole a of the output shaft, flows into the working oil cavity 901 through the working oil hole c of the output shaft and the working oil hole d of the outer hub, and thus the movement of the piston 60 can be realized. In order to realize the lubrication and cooling of the clutch plate 51 and the clutch friction plate 52 and the brake plate 81 and the brake friction plate 82, part of the lubricating and cooling oil enters the lubricating oil hole b, flows into the first piston lubricating oil hole i or the second piston lubricating oil hole j through the second output shaft lubricating oil hole g and the second lubricating oil hole h, and thus the lubrication and cooling of the clutch assembly 50 can be realized; another part of the lubricating and cooling oil flows into the first output shaft lubricating oil hole e and the first lubricating oil hole f, and thus the lubrication and cooling of the brake assembly 80 can be realized.

[0080] The influence of the movement of the piston 60 on the piston lubricating oil hole can be seen from Fig. 5. The sectional area of the first piston lubricating oil hole i is much smaller than that of the second piston lubricating oil hole j. When the wet clutch is separated, the clutch plate 51 and the clutch friction plate 52 are not engaged, the heat generated is less, and thus the required lubricating and cooling oil flow is less; and the brake plate 81 and the brake friction plate 82 are engaged, the heat generated is more, and thus the required lubricating and cooling oil flow is more.

[0081] When the working oil cavity 901 is not filled with working oil, the piston stroke is 0, part of the lubricating and cooling oil flows into the first piston lubricating oil hole i through the second lubricating oil hole h, at this time, more part of the lubricating and cooling oil flows to the brake assembly 80, and less part of the lubricating and cooling oil flows to the clutch assembly 50, and thus the large amount of heat generated when the brake plate 81 and the brake friction plate 82 are engaged can be taken away, and the increase of the torque of the clutch plate 51 and the clutch friction plate 52 caused by the excessive oil between them can be prevented, and the braking effect of the wet clutch on the output shaft can be affected. When the wet clutch is engaged, the clutch plate 51 and the clutch friction plate 52 are engaged, the heat generated is more, and thus the required lubricating and cooling oil flow is more; and the brake plate 81 and the brake friction plate 82 are not engaged, the heat generated is less, and thus the required lubricating and cooling oil flow is less. When the wet clutch is engaged, the working oil cavity 901 is filled with working oil, the total gap between the clutch plate 51 and the clutch friction plate 52 is α, at this time, the piston stroke is △ = α, part of the lubricating and cooling oil flows into the second piston lubricating oil hole j through the second lubricating oil hole h, at this time, more part of the lubricating and cooling oil flows to the clutch assembly 50, and less part of the lubricating and cooling oil flows to the brake assembly 80, and thus the large amount of heat generated when the clutch plate 51 and the clutch friction plate 52 are engaged can be taken away, and the increase of the torque of the brake plate 81 and the brake friction plate 82 caused by the excessive oil between them can be prevented, and the power transmission efficiency of the wet clutch can be affected.

[0082] When the clutch plate 51 and the clutch friction plate 52 are worn after engagement, the total gap between the clutch plate 51 and the clutch friction plate 52 will be larger, and the piston stroke will also be larger. Assuming that the total wear amount is δ, the piston stroke at this time is △ = α + δ. Since the second piston lubrication oil outlet hole j is not offset to completely coincide with the second lubrication oil outlet hole h when the total wear amount δ is 0, but a certain stroke is reserved. Therefore, after the clutch plate 51 and the clutch friction plate 52 are worn, the piston stroke △ will gradually increase, and the second piston lubrication oil outlet hole j will gradually offset to a position completely coinciding with the second lubrication oil outlet hole h. As the total wear amount δ increases, the piston stroke △ further increases, and the second piston lubrication oil outlet hole j will offset to the other side of the second lubrication oil outlet hole h. During the entire process of the mutual wear of the clutch plate 51 and the clutch friction plate 52 during engagement, the second piston lubrication oil outlet hole j is always coincident with the second lubrication oil outlet hole h, that is, there is always an oil passage for transmitting lubricating cooling oil, and the cross-sectional area of the oil passage is always larger than that of the first piston lubrication oil outlet hole i. In this way, there is always sufficient flow to take away a large amount of heat generated during engagement of the clutch plate 51 and the clutch friction plate 52, thereby ensuring the stability of the wet clutch.

[0083] Therefore, two lubrication oil outlet holes are provided on the piston 60, the lubrication oil outlet hole with a larger cross-sectional area is oil-conducting when the wet clutch is engaged, and the lubrication oil outlet hole with a smaller cross-sectional area is oil-conducting when the wet clutch is separated. In this way, the flow can be reasonably distributed according to the friction heat generated by the clutch assembly 50 and the brake assembly 80, the reliability of the electro-hydraulic wet multi-plate clutch is improved, the lubrication oil outlet hole with a larger internal size on the piston 60 can always maintain a large enough oil passage with the second lubrication oil outlet hole h during the entire process of mutual wear of the clutch plate 51 and the clutch friction plate 52, and sufficient oil flow can be ensured during the engagement process of the wet clutch, thereby improving the stability of the wet clutch.

[0084] As shown in FIGS. 3 and 4, specifically, when the wet clutch is engaged, the working oil enters the working oil chamber 901, and the working oil rotates in the working oil chamber 901 to generate a centrifugal force, and the centrifugal force of the working oil generates a dynamic pressure on the piston 60. When the wet clutch is separated, most of the working oil is discharged from the working oil chamber 901, but a small part of the working oil is not discharged. The dynamic pressure generated by the working oil will push the piston 60 to move, so that the gap between the clutch plate 51 and the clutch friction plate 52 becomes smaller or even tightens, which undoubtedly affects the separation effect and causes the generation of adverse operation.

[0085] To eliminate the influence of the part of working oil, as shown in FIG. 9, FIG. 10 and FIG. 14, specifically, the wet clutch is provided with a pressure relief assembly 100, the pressure relief assembly 100 comprises a first pressure relief oil hole 110, a second pressure relief oil hole 120, a blocking piece 130 and a pressure relief elastic piece 140, wherein the first pressure relief oil hole 110 and the working oil cavity 901 are communicated, the blocking piece 130 is movably arranged between the first pressure relief oil hole 110 and the second pressure relief oil hole 120; the pressure relief elastic piece 140 is used to provide an elastic force to drive the blocking piece 130 to move, so as to realize that when the clutch assembly 50 is engaged, the blocking piece 130 is at a position to realize that the first pressure relief oil hole 110 and the second pressure relief oil hole 120 are blocked with each other, and when the clutch assembly 50 is separated, the blocking piece 130 is at a position to realize that the first pressure relief oil hole 110 and the second pressure relief oil hole 120 are communicated with each other or blocked with each other.

[0086] As shown in FIG. 9, in an embodiment, the outer hub 40 is provided with a receiving cavity 150, the receiving cavity 150 is provided with a positioning column 160, the blocking member 130 is movably arranged in the receiving cavity 150, and the two ends of the pressure relief elastic member 140 abut against the blocking member 130 and the positioning column 160 respectively; the second pressure relief oil hole 120 is arranged on the positioning column 160, and the first pressure relief oil hole 110 is arranged on the outer hub 40 close to the outer side of the piston 60; the second pressure relief oil hole 120 is coaxially arranged with the first pressure relief oil hole 110. In an embodiment, the blocking member 130 is a spherical structure, and the end of the second pressure relief oil hole 120 is provided with a conical surface structure 121 matched with the spherical structure to ensure the blocking effect. Specifically, the pressure relief elastic member 140 is a pressure relief spring. When the working oil cavity 901 is filled with oil, the working oil enters from the first pressure relief oil hole 110, at this time, the acting force F1 of the working oil is much greater than the rebound force F2 of the pressure relief elastic member 140, so as to push the blocking member 130 of the spherical structure to extrude the pressure relief elastic member 140 and abut against the conical surface structure 121 inside the second pressure relief oil hole 120, so that the blocking member 130 blocks the second pressure relief oil hole 120 to prevent the working oil in the working oil cavity 901 from leaking. When the working oil in the working oil cavity 901 leaks, a small part of the working oil generates a dynamic pressure to push the blocking member 130 close to the second pressure relief oil hole 120. At this time, the blocking member 130 cannot abut against the conical surface structure 121, otherwise the excess working oil cannot be discharged. In order to meet the above requirements, the pressure relief elastic member 140 has an acting force F21 when the blocking member 130 blocks the first pressure relief oil hole 110, the pressure relief elastic member 140 has an acting force F22 when the pressure relief ball blocks the second pressure relief oil hole 120, and the pressure relief working oil has an acting force F1', which should satisfy F21 < F1' < F22. In this way, the pressure relief ball neither blocks the first pressure relief oil hole 110 nor blocks the second pressure relief oil hole 120, and the excess working oil will flow out from the second pressure relief oil hole 120. Therefore, when the wet clutch is separated, the working oil can be completely discharged, the dynamic pressure generated by the centrifugal force of the working oil on the piston 60 is eliminated, the clutch assembly 50 is completely separated, and the generation of poor work is prevented. It can be understood that in some embodiments not shown, the above pressure relief structure can also be arranged at other positions of the outer hub 40, so that the excess working oil in the working oil cavity 901 can be discharged when the working oil leaks, and the axis of the mounting cavity 150 can be arranged at various angles intersecting the axis of the output transmission member 20.

[0087] As shown in FIGS. 10-12, in an embodiment, the outer side of the piston 60 is provided with a sliding member 61 slidingly connected to the outer hub 40, the blocking member 130 is a blocking ring provided on the sliding member 61, the first pressure relief oil hole 110 and the second pressure relief oil hole 120 are coaxially provided on both sides of the sliding member 61, the sliding member 61 is provided with an annular transition oil leakage groove 63, when the clutch assembly 50 is separated, the elastic assembly 70 replaces the pressure relief elastic assembly 140 to drive the piston 60 to move the blocking ring on the sliding member 61 so that the annular transition oil leakage groove 63 is respectively communicated with the first pressure relief oil hole 110 and the second pressure relief oil hole 120, and when the clutch assembly 50 is engaged, the piston 60 moves the blocking ring on the sliding member 61 to block the first pressure relief oil hole 110 and the second pressure relief oil hole 120.

[0088] As shown in FIG. 13, when the clutch assembly 50 is separated, i.e., the piston stroke Δ is 0, the working oil in the working oil chamber 901 flows out through the first pressure relief oil hole 110, the annular transition oil leakage groove 63 on the sliding member 61 and the second pressure relief oil hole 120, which can avoid the influence of dynamic pressure on the separation effect of the wet clutch. When the clutch assembly 50 is engaged, i.e., the piston stroke is Δ = α, the brake return elastic member 64 pushes the sliding member 61 to move axially with the piston 60, at this time the first pressure relief oil hole 110 is blocked by the blocking ring on the sliding member 61, which ensures that there is a large enough pressure in the working oil chamber 901. Considering the wear of the clutch assembly 50, i.e., the piston stroke is Δ = α + δ, the position of the sliding member 61 is offset, but the first pressure relief oil hole 110 is still blocked by the sliding member 61 to ensure that there is a large enough pressure in the working oil chamber 901. Assuming that the width of the first pressure relief oil hole 110 along the axial direction of the sliding member 61 is d4, the width z of the annular transition oil leakage groove 63 along the axial direction of the sliding member 61 should satisfy z = d4, and the length y of the blocking ring should satisfy: y ≥ α + [δ], wherein [δ] is the maximum wear of the clutch assembly 50.

[0089] As shown in FIGS. 14-16, in an embodiment, the outer side of the piston 60 is provided with a sliding member 61 slidingly connected to the outer hub 40, the blocking member 130 is a blocking ring provided on the sliding member 61, the first pressure relief oil hole 110 is provided in the outer hub 40 close to the outer side of the piston 60, the second pressure relief oil hole 120 is provided in the sliding member 61, the sliding member 61 is provided with an annular transition oil leakage groove 63, and the second pressure relief oil hole 120 is communicated with the annular transition oil leakage groove 63; when the clutch assembly 50 is separated, the elastic assembly 70 replaces the pressure relief elastic assembly 140 to drive the piston 60 to move the blocking ring on the sliding member 61 so that the transition oil leakage groove 63 is communicated with the first pressure relief oil hole 110; when the clutch assembly 50 is engaged, the piston 60 moves the blocking ring on the sliding member 61 to block the first pressure relief oil hole 110 and the second pressure relief oil hole 120. Specifically, the second pressure relief oil hole 120 penetrates along the axial line of the sliding member 61 to be communicated with the annular transition oil leakage groove 63.

[0090] As shown in Fig. 17, when the clutch assembly 50 is separated, i.e. the piston stroke Δ is 0, the working oil in the working oil chamber 901 flows out through the first oil drain hole 110, the annular transition oil drain groove 63 and the second oil drain hole 120, which can avoid the influence of dynamic pressure on the separation effect of the wet clutch. When the clutch assembly 50 is engaged, i.e. the piston stroke is Δ = α, the brake return elastic member 64 pushes the sliding member 61 to move axially along with the piston 60, at this time the first oil drain hole 110 is blocked by the sliding member 61, so as to ensure that there is a large enough pressure in the working oil chamber 901. Considering the wear of the clutch assembly 50, i.e. the piston stroke is Δ = α + δ, the position of the sliding member 61 is offset, but the first oil drain hole 110 is still blocked by the sliding member 61, so as to ensure that there is a large enough pressure in the working oil chamber 901. The width of the annular groove on the sliding member 61 along the axial direction of the sliding member 61 is z, and the width of the first oil drain hole 110 along the axial direction of the sliding member 61 is d4, so z = d4 is met. The cross-sectional area d5 of the second oil drain hole 120 is equal to the size of the inner diameter of the first oil drain hole 110, i.e. d5 = d4. The blocking member 130 is a blocking ring arranged on the sliding member 61, and the length y of the blocking ring should meet the condition: y ≥ α + [δ], wherein [δ] is the maximum wear.

[0091] Based on the same concept as the foregoing embodiments, the embodiments of the present application also provide a transmission system, which can be provided with the electro-hydraulic wet clutch as described in the foregoing embodiments.

[0092] According to the above embodiments, it can be seen that the electro-hydraulic wet clutch and the transmission system disclosed by the present application can increase the lubricating oil flow into the clutch assembly by arranging a plurality of piston lubricating oil outlet holes on the piston, one or more of which are in communication with the lubricating oil when the clutch assembly is engaged and the brake assembly is separated, so as to increase the lubricating oil flow passage cross-sectional area of the piston and thereby increase the lubricating oil flow into the clutch assembly. Since the n1 piston lubricating oil outlet holes are aligned or partially misaligned with the second lubricating oil outlet hole when the clutch assembly is engaged, the first part and the second part of the clutch assembly can always maintain a large enough oil passage with the second lubricating oil outlet hole throughout the mutual wear process, thereby greatly improving the performance of agricultural machinery, engineering machinery and hybrid electric vehicles.

[0093] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements within the technical range disclosed by the present application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An electro-hydraulic wet clutch characterized by, The clutch assembly (50) and the piston (60) form a lubricating cavity (902) therebetween, the piston (60) is provided with N piston lubricating oil outlet holes, the outer hub (40) is provided with a second lubricating oil outlet hole (h), the piston lubricating oil outlet holes can be communicated with or disconnected from the lubricating oil passage (102) through the second lubricating oil outlet hole (h); When the clutch assembly (50) is engaged, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through n1 piston lubricating oil outlet holes, part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole (h) when the clutch assembly (50) is in a non-wearing state, and the part away from the input transmission member (10) is staggered with the second lubricating oil outlet hole (h), the n1 piston lubricating oil outlet holes are aligned with the second lubricating oil outlet hole (h) when the clutch assembly (50) is in a wearing state, or part of the n1 piston lubricating oil outlet holes is staggered with the second lubricating oil outlet hole (h), and the part close to the input transmission member (10) is staggered with the second lubricating oil outlet hole (h); Wherein, N is a positive integer greater than or equal to 2; n1 is a positive integer greater than or equal to 1 and less than or equal to N. When the clutch assembly (50) is separated, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through n2 piston lubricating oil outlet holes, the total cross-sectional area of the n1 piston lubricating oil outlet holes is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes; wherein, n2 is a positive integer greater than or equal to 1 and less than N; When the clutch assembly (50) is engaged and n1 piston lubricating oil outlet holes are partially staggered with the second lubricating oil outlet hole (h), the cross-sectional area of the part of the n1 piston lubricating oil outlet holes aligned with the second lubricating oil outlet hole (h) is greater than the total cross-sectional area of the n2 piston lubricating oil outlet holes.

2. The electro-hydraulic wet clutch of claim 1, wherein, The piston (60) is provided with a first piston lubricating oil outlet hole (i) and a second piston lubricating oil outlet hole (j), the first piston lubricating oil outlet hole (i) and the second piston lubricating oil outlet hole (j) are selectively or simultaneously communicated with the lubricating oil passage (102); ​ 3. The electro-hydraulic wet clutch of claim 2, wherein, ​ When the clutch assembly (50) is separated, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the first piston lubricating oil outlet hole (i) and the second piston lubricating oil outlet hole (j) alternatively; when the clutch assembly (50) is engaged, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the first piston lubricating oil outlet hole (i) and the second piston lubricating oil outlet hole (j) alternatively or simultaneously.

4. The electro-hydraulic wet clutch of claim 3, wherein, The cross-sectional area of the first piston lubricating oil outlet hole (i) is smaller than that of the second piston lubricating oil outlet hole (j); when the clutch assembly (50) is separated, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the first piston lubricating oil outlet hole (i); when the clutch assembly (50) is engaged, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the second piston lubricating oil outlet hole (j).

5. The electro-hydraulic wet clutch of claim 4, wherein, When the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the second piston lubricating oil outlet hole (j), part of the second piston lubricating oil outlet hole (j) is misaligned with the second lubricating oil outlet hole (h), and the part misaligned with the second lubricating oil outlet hole (h) and the first piston lubricating oil outlet hole (i) are located on the two sides of the lubricating oil passage (102) respectively, and the cross-sectional area of the part of the second piston lubricating oil outlet hole (j) aligned with the second lubricating oil outlet hole (h) is greater than that of the first piston lubricating oil outlet hole (i); or, When the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the second piston lubricating oil outlet hole (j), the second piston lubricating oil outlet hole (j) is aligned with the second lubricating oil outlet hole (h); or, When the lubricating oil passage (102) is communicated with the lubricating cavity (902) through the second piston lubricating oil outlet hole (j), part of the second piston lubricating oil outlet hole (j) is misaligned with the second lubricating oil outlet hole (h), and the part misaligned with the second lubricating oil outlet hole (h) and the first piston lubricating oil outlet hole (i) are located on the same side of the lubricating oil passage (102) respectively, and the cross-sectional area of the part of the second piston lubricating oil outlet hole (j) aligned with the second lubricating oil outlet hole (h) is greater than that of the first piston lubricating oil outlet hole (i).

6. The electro-hydraulic wet clutch of claim 2, wherein, The wet clutch further comprises a brake assembly (80), the brake assembly (80) comprises a third part and a fourth part, the third part is fixedly connected to the output transmission member (20), and the fourth part is fixedly connected to the mounting box body; The side of the piston (60) is provided with a sliding piece (61), the sliding piece (61) is used for abutting against the side of the brake assembly (80), so that the third part is tightly attached to the fourth part when the clutch assembly (50) is separated, and the third part is separated from the fourth part when the clutch assembly (50) is engaged, so as to make the brake assembly (80) engaged or separated; When the clutch assembly (50) is separated and the brake assembly (80) is engaged, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through n2 piston lubricating oil outlet holes; When the clutch assembly (50) is engaged and the brake assembly (80) is separated, the lubricating oil passage (102) is communicated with the lubricating cavity (902) through n1 piston lubricating oil outlet holes, n1 piston lubricating oil outlet holes are partially misaligned or aligned with the second lubricating oil outlet hole (h), when n1 piston lubricating oil outlet holes are partially misaligned with the second lubricating oil outlet hole (h), the cross-sectional area of the part of n1 piston lubricating oil outlet holes aligned with the second lubricating oil outlet hole (h) is greater than the total cross-sectional area of n2 piston lubricating oil outlet holes.

7. The electro-hydraulic wet clutch of claim 6, wherein, The lubricating oil passage (102) enters the output transmission member (20) along the output end side of the output transmission member (20), and is sequentially communicated with the lubricating cavity (902) and the brake assembly (80) through the output transmission member (20) and the outer hub (40) along the direction parallel to the axis of the output transmission member (20) and the direction perpendicular to the axis of the output transmission member (20) respectively.

8. The electro-hydraulic wet clutch of claim 1, wherein, The clutch assembly (50) further comprises an inner hub (30), the inner hub (30) is fixedly connected to the input transmission member (10), the clutch assembly (50) is movably connected to the inner hub (30) along the axial direction, the first part is fixedly connected to the inner hub (30) along the circumferential direction, and the second part is fixedly connected to the outer hub (40) along the circumferential direction. The piston (60) comprises a piston sleeve (65), the piston sleeve (65) is sleeved on the outer hub (40), and an elastic assembly (70) is arranged between the piston (60) and the inner hub (30), the elastic assembly (70) is used for providing a force for driving the first part and the second part of the clutch assembly (50) to be separated.

9. The electro-hydraulic wet clutch of claim 8, wherein, The piston lubricating oil outlet holes are arranged on the piston sleeve (65) in an interval manner.

10. A transmission system characterized by, The transmission system is provided with the electro-hydraulic wet clutch as claimed in any one of claims 1 to 9.

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