Wet clutch four-wheel drive transfer case and harvester

Abstract

The utility model relates to a wet clutch four-wheel drive transfer case and a harvester, which comprise a shell, a connecting piece, an inner driven piece, an outer driven piece, a piston piece, a plurality of outer friction plates and a plurality of inner toothed plates, and the connecting piece and the inner driven piece are coaxially arranged in the shell; the inner toothed plates coaxially sleeve the end, close to the connecting piece, of the inner driven piece, the outer friction plates coaxially sleeve the inner driven piece, the outer driven piece fixedly sleeves the end, close to the inner driven piece, of the connecting piece, one end of the outer driven piece is connected with the edges of the outer friction plates in a clamped mode, and the outer friction plates can slide in the axial direction of the outer driven piece. The piston piece coaxially sleeves the inner driven piece in a sliding manner, and a hydraulic cavity is formed between the piston piece and the shell; a hydraulic oil port communicated with the hydraulic cavity is formed in the shell, and hydraulic oil is injected into the hydraulic cavity through the hydraulic oil port so that the piston piece can be pushed to extrude the multiple outer friction plates and the multiple inner toothed plates. The mechanical four-wheel drive switching mechanism is reasonable in layout, small in occupied space, light in weight, capable of achieving quick switching of mechanical four-wheel drive and convenient to switch.

Description

Technical Field

[0001] The utility model relates to the technical field of harvesters, in particular to a wet clutch four-wheel drive transfer case and a harvester. Background Art

[0002] There are two types of mechanical four-wheel drive structures in the current domestic market: one is a transfer case + rear drive axle, which is a four-wheel drive structure directly connected by a transmission shaft but with reverse drag; the other is a transfer case + rear drive axle with a split case, which is connected by a transmission shaft, but the transmission shaft can be disconnected during the transition process. Both structures use a clutch sleeve shifting method, which makes shifting difficult. Utility Model Content

[0003] The utility model provides a wet clutch four-wheel drive transfer case and a harvester, aiming to solve the problems in the prior art.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A wet clutch four-wheel drive transfer case, comprising a housing, a connecting piece, an inner driven piece, an outer driven piece, a piston piece, a plurality of outer friction plates and a plurality of inner tooth plates, wherein the connecting piece and the inner driven piece are coaxially mounted in the housing, and their mutually close ends are connected by a connecting cylindrical pin, and their mutually distant ends extend to the outside of the housing, respectively, and can rotate around their own axes;

[0006] The plurality of inner tooth plates are respectively coaxially sleeved on one end of the inner follower close to the connecting member, and can rotate with the inner follower and can slide along the axial direction of the inner follower; the plurality of outer friction plates are respectively coaxially sleeved outside the inner follower, and are alternately and spaced with the plurality of inner tooth plates in sequence, and can rotate around the axial direction of the inner follower; the outer follower is fixedly sleeved on one end of the connecting member close to the inner follower, and one end of the outer follower is respectively clamped with the edges of the plurality of outer friction plates, and the plurality of outer friction plates can slide along the axial direction of the outer follower;

[0007] The piston member is coaxially slidably sleeved outside the inner follower, and its outer wall is slidably fitted with the outer shell, and a hydraulic cavity is formed between it and the outer shell; a hydraulic oil port connected to the hydraulic cavity is provided on the outer shell, and hydraulic oil is injected into the hydraulic cavity through the hydraulic oil port to push the piston member to squeeze the multiple outer friction plates and the multiple inner gear plates.

[0008] The beneficial effects of the utility model are as follows: during use, hydraulic oil is fed into the hydraulic cavity from the hydraulic oil port, and the hydraulic oil pushes the piston member to move along the axial direction of the inner driven member, so as to squeeze the multiple outer friction plates and the multiple inner gear plates so that the multiple outer friction plates and the multiple inner gear plates are squeezed and fitted with each other, so that the connecting member drives the inner driven member to rotate, thereby realizing the four-wheel drive combination;

[0009] When the multiple outer friction plates and the multiple inner gear plates are separated from each other, the connecting member and the outer driven member drive the multiple outer friction plates to rotate around the axial direction of the inner driven member, thereby realizing the combination of two drives.

[0010] The utility model has reasonable layout, small space occupation, light weight, can realize fast switching of mechanical four-wheel drive, and the switching is convenient.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the outer shell includes a clutch housing and a housing cover, both ends of the clutch housing are open, and the housing cover is fixedly installed at one open end of the clutch housing; the inner follower passes through the housing cover, and is rotatably connected to the housing cover through a support bearing; the connecting member is rotatably installed at the other open end of the clutch housing through two connecting bearings.

[0013] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the housing adopts a split structure, which is easy to assemble and thus easy to maintain later.

[0014] Furthermore, oil guide plates are respectively provided at the two connecting bearings corresponding to the other end of the clutch housing, and the two oil guide plates are fixedly connected to the other end of the clutch housing by multiple long screws; a shielding plate is also provided at the other end of the clutch housing near the external follower, and the corresponding oil guide plate is located between the shielding plate and the external follower.

[0015] The beneficial effects of adopting the above further solution are simple structure, reasonable design, utilizing the oil guide plate to guide the oil, and utilizing the shielding plate to shield the oil.

[0016] Furthermore, the piston member includes a hydraulic plunger and a pressure dividing plate, and the pressure dividing plate is coaxially sleeved on the inner follower, which can slide along the axial direction of the inner follower, and one end of which abuts against the corresponding outer friction plate or the inner gear plate; the hydraulic plunger is coaxially sleeved outside the inner follower, and its outer side slides with the housing cover and forms the hydraulic cavity between the housing cover; the hydraulic oil ports are distributed on the housing cover.

[0017] The beneficial effect of adopting the above further scheme is that during use, the hydraulic oil is sent into the hydraulic cavity from the hydraulic oil port, and the hydraulic oil pushes the hydraulic plunger to move along the axial direction of the inner follower, thereby pushing the pressure dividing plate to move to squeeze the multiple outer friction plates and the multiple inner gear plates so that the multiple outer friction plates and the multiple inner gear plates are squeezed and fitted with each other, so that the connecting member drives the inner follower to rotate, thereby realizing the four-wheel drive combination;

[0018] When the multiple outer friction plates and the multiple inner gear plates are separated from each other, the connecting member and the outer driven member drive the multiple outer friction plates to rotate around the axial direction of the inner driven member, thereby realizing the combination of two drives.

[0019] Furthermore, the hydraulic plunger is slidably connected to the housing cover via a plurality of elastic cylindrical pins.

[0020] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing elastic cylindrical pins to realize sliding connection between the hydraulic plunger and the housing cover, thereby ensuring stable movement of the hydraulic plunger.

[0021] Furthermore, a thrust ring is coaxially fixedly installed at one end of the inner follower close to the connecting member, and the thrust ring is fixedly connected to the inner follower through a plurality of spiral elastic pins; the plurality of outer friction plates and the plurality of inner tooth plates are located between the thrust ring and the pressure dividing plate, and the thrust ring abuts against the corresponding outer friction plates or the inner tooth plates; the plurality of outer friction plates and the plurality of inner tooth plates are provided with through holes, and a return spring is installed at the through hole, and the two ends of the return spring abut against the pressure dividing plate and the thrust ring respectively.

[0022] The beneficial effect of adopting the above further scheme is that during use, the hydraulic oil is sent into the hydraulic cavity from the hydraulic oil port, and the hydraulic oil pushes the hydraulic plunger to move along the axial direction of the inner follower, thereby pushing the pressure dividing plate to move to squeeze the multiple outer friction plates and the multiple inner gear plates so that the multiple outer friction plates and the multiple inner gear plates are pressed and fitted against each other, so that the connecting member drives the inner follower to rotate, thereby realizing the four-wheel drive combination, and at this time the return spring is in a compressed state;

[0023] When the hydraulic oil supply is stopped, the return spring rebounds by its own elastic force, so that the multiple outer friction plates and the multiple inner gear plates are separated from each other. At this time, the connecting member and the outer follower drive the multiple outer friction plates to rotate around the axial direction of the inner follower, realizing the combination of two drives;

[0024] The solution has a simple structure and a reasonable design, and uses a thrust ring to limit the movement of multiple outer friction plates and multiple inner gear plates.

[0025] Furthermore, the inner follower has a structure with one end being thick and the other end being thin, and the thick end is close to the connecting member; a groove is provided at the thick end of the inner follower, one end of the connecting member extends into the groove, and is connected to one end of the inner follower through the connecting cylindrical pin.

[0026] The beneficial effects of adopting the above further solution are simple structure, reasonable shape design of the inner follower, convenience for assembling various components, and convenience for matching between various components.

[0027] Furthermore, a locking nut is threadedly sleeved on one end of the connecting member, and a supporting plate is sleeved on one end of the connecting member, and two ends of the supporting plate are respectively abutted against the locking nut and the external follower.

[0028] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the use of locking nuts and support plates to limit the assembly of the external follower, which makes assembly convenient.

[0029] Furthermore, an annular groove is provided at one end of the outer follower, and one end of the inner follower extends into the annular groove; a thrust washer is also installed in the annular groove, and two sides of the thrust washer are respectively abutted against the inner side of the annular groove and the thrust ring.

[0030] The beneficial effects of adopting the above further solution are simple structure, reasonable shape design of the outer follower, and blocking by using thrust washers.

[0031] The utility model also relates to a harvester, comprising the wet clutch four-wheel drive transfer case as described above.

[0032] The beneficial effect of adopting the above further scheme is that the utility model also provides a harvester, which has a reasonable layout, occupies a small space, is light in weight, can realize rapid switching of mechanical four-wheel drive, and is easy to switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the utility model.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1. Long screw; 2. Oil guide plate; 3. Shielding plate; 4. Spiral elastic pin; 5. Return spring; 6. Lock nut; 7. O-ring; 8. Elastic washer; 9. Connecting bearing; 10. Bushing; 11. Elastic cylindrical pin; 12. Housing cover; 13. Output flange; 14. End disc; 15. Fixing screw; 16. Inner follower; 17. Clutch housing; 18. Oil seal; 19. Connecting cylindrical pin; 20. Hydraulic plunger; 21. Thrust washer; 22. Guide key; 23. Connecting piece; 24. Pressure dividing plate; 25. Support plate; 26. Outer friction plate; 27. Inner gear plate; 28. Thrust ring; 29. ​​Outer follower; 30. Hydraulic oil port. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment provides a wet clutch four-wheel drive transfer case, including a housing, a connecting member 23, an inner driven member 16, an outer driven member 29, a piston member, a plurality of outer friction plates 26 and a plurality of inner tooth plates 27, wherein the connecting member 23 and the inner driven member 16 are coaxially mounted in the housing, and their ends close to each other are connected by a connecting cylindrical pin 19, and the ends of the connecting member 23 and the inner driven member 16 far from each other extend to the outside of the housing, respectively, and can rotate around their own axes;

[0042] The plurality of inner tooth plates 27 are respectively coaxially sleeved on one end of the inner follower 16 close to the connecting member 23, and can rotate with the inner follower 16 and can slide along the axial direction of the inner follower 16; the plurality of outer friction plates 26 are respectively coaxially sleeved outside the inner follower 16, and are alternately and spaced with the plurality of inner tooth plates 27 in sequence, and can rotate around the axial direction of the inner follower 16; the outer follower 29 is fixedly sleeved on one end of the connecting member 23 close to the inner follower 16, and one end of the outer follower 29 is respectively engaged with the edges of the plurality of outer friction plates 26, and the plurality of outer friction plates 26 can slide along the axial direction of the outer follower 29;

[0043] The piston member is coaxially slidably sleeved outside the inner follower 16, and its outer wall is slidably fitted with the outer shell, and a hydraulic chamber is formed between it and the outer shell; a hydraulic oil port 30 connected to the hydraulic chamber is provided on the outer shell, and hydraulic oil is injected into the hydraulic chamber through the hydraulic oil port 30 to push the piston member to squeeze the multiple outer friction plates 26 and the multiple inner tooth plates 27.

[0044] During use, hydraulic oil is fed into the hydraulic cavity through the hydraulic oil port 30, and the hydraulic oil pushes the piston to move along the axial direction of the inner follower 16, so as to squeeze the multiple outer friction plates 26 and the multiple inner tooth plates 27 so that the multiple outer friction plates 26 and the multiple inner tooth plates 27 are pressed and fitted against each other, so that the connecting member 23 drives the inner follower 16 to rotate, thereby realizing the four-wheel drive combination;

[0045] When the multiple outer friction plates 26 and the multiple inner tooth plates 27 are separated from each other, the connecting member 23 and the outer follower 29 drive the multiple outer friction plates 26 to rotate around the axial direction of the inner follower 16 to achieve the two-wheel drive combination.

[0046] Preferably, in this embodiment, the inner follower 16 and the connecting member 23 are both cylindrical structures.

[0047] In addition, the outer follower 29 is preferably a cylindrical structure.

[0048] This embodiment has a reasonable layout, occupies a small space, is light in weight, and can realize fast switching of mechanical four-wheel drive, and the switching is convenient.

[0049] Example 2

[0050] On the basis of Example 1, in this embodiment, the housing includes a clutch housing 17 and a housing cover 12, both ends of the clutch housing 17 are open, and the housing cover 12 is fixedly installed at one open end of the clutch housing 17 by multiple screws; the inner follower 16 passes through the housing cover 12, and is rotatably connected to the housing cover 12 through a support bearing; the connecting member 23 is rotatably installed at the other open end of the clutch housing 17 through two connecting bearings 9.

[0051] The solution has a simple structure and a reasonable design. The shell adopts a split structure, which is easy to assemble and thus facilitate subsequent maintenance.

[0052] Preferably, in this embodiment, the clutch housing 17 is preferably a circular housing with one end being thick and the other end being thin.

[0053] In addition, the housing cover 12 is preferably a circular cover.

[0054] Preferably, in this embodiment, the housing cover 12 is fixedly connected to the clutch housing 17 by a plurality of bolts, and an elastic washer 8 is sleeved on each bolt, and the elastic washer 8 abuts against the clutch housing 17 and the nut of the bolt respectively.

[0055] Based on the above scheme, an output flange 13 is sleeved on one end of the inner follower 16 extending to the outside of the clutch housing 17, and a fixing screw 15 is threadedly connected on one end of the inner follower 16 extending to the outside of the clutch housing 17, and an end disc 14 is sleeved on the fixing screw 15, one end of the end disc 14 is pressed tightly against the output flange 13, and the nut end of the fixing screw 15 is pressed tightly against the end disc 14.

[0056] In addition, an oil seal 18 is installed between one end of the output flange 13 and the support bearing.

[0057] Example 3

[0058] On the basis of Example 2, in this embodiment, oil guide plates 2 are respectively provided at the other end of the clutch housing 17 corresponding to the two connecting bearings 9, and the two oil guide plates 2 are fixedly connected to the other end of the clutch housing 17 by multiple long screws 1; a shielding plate 3 is also provided at the other end of the clutch housing 17 near the external follower 29, and the corresponding oil guide plate 2 is located between the shielding plate 3 and the external follower 29.

[0059] The solution has a simple structure and a reasonable design. The oil guide plate 2 is used to guide the oil, and the shielding plate 3 is used to shield the oil.

[0060] Preferably, in this embodiment, the two oil guide plates 2 are preferably circular ring structures.

[0061] In addition, the shielding plate 3 is preferably a conical structure, with its thick end facing the outer follower 29 .

[0062] Example 4

[0063] On the basis of any one of Examples 2 to 3, in this embodiment, the piston member includes a hydraulic plunger 20 and a pressure dividing plate 24, and the pressure dividing plate 24 is coaxially sleeved on the inner follower 16, and can slide along the axial direction of the inner follower 16, and one end thereof abuts against the corresponding outer friction plate 26 or the inner gear plate 27; the hydraulic plunger 20 is coaxially sleeved outside the inner follower 16, and its outer side slides with the housing cover 12 and forms the hydraulic cavity between the housing cover 12; the hydraulic oil port 30 is distributed on the housing cover 12.

[0064] During use, hydraulic oil is fed into the hydraulic cavity through the hydraulic oil port 30, and the hydraulic oil pushes the hydraulic plunger 20 to move along the axial direction of the inner follower 16, thereby pushing the pressure dividing plate 24 to move to squeeze the multiple outer friction plates 26 and the multiple inner tooth plates 27 so that the multiple outer friction plates 26 and the multiple inner tooth plates 27 are pressed and fitted against each other, so that the connecting member 23 drives the inner follower 16 to rotate, thereby realizing the four-wheel drive combination;

[0065] When the multiple outer friction plates 26 and the multiple inner tooth plates 27 are separated from each other, the connecting member 23 and the outer follower 29 drive the multiple outer friction plates 26 to rotate around the axial direction of the inner follower 16 to achieve the two-wheel drive combination.

[0066] Preferably, in this embodiment, two steps are provided on the housing cover 12, and the hydraulic plunger 20 is thin at one end and thick at the other end, wherein the thin end slides in contact with one of the steps, and the thick end slides in contact with the other step.

[0067] Preferably, in this embodiment, O-rings 7 are respectively provided between the outer sides of both ends of the hydraulic plunger 20 and the side surfaces of the two steps to prevent leakage of hydraulic oil.

[0068] Preferably, in this embodiment, a step is provided on the inner follower 16 , and the pressure dividing plate 24 is slidably connected to the step via a guide key 22 .

[0069] Example 5

[0070] On the basis of Embodiment 4, in this embodiment, the hydraulic plunger 20 is slidably connected to the housing cover 12 via a plurality of elastic cylindrical pins 11 .

[0071] This solution has a simple structure and a reasonable design. The elastic cylindrical pin 11 is used to realize the sliding connection between the hydraulic plunger 20 and the housing cover 12, thereby ensuring the stable movement of the hydraulic plunger 20.

[0072] Based on the above solution, one end of the plurality of elastic cylindrical pins 11 is fixedly connected to the housing cover 12 respectively, and the other end is slidably connected to the guide holes on the housing cover 12 respectively.

[0073] Example 6

[0074] On the basis of any one of Examples 4 to 5, in this embodiment, a thrust ring 28 is coaxially fixedly installed at one end of the inner follower 16 close to the connecting member 23, and the thrust ring 28 is fixedly connected to the inner follower 16 through a plurality of spiral elastic pins 4; the plurality of outer friction plates 26 and the plurality of inner tooth plates 27 are located between the thrust ring 28 and the pressure dividing plate 24, and the thrust ring 28 abuts against the corresponding outer friction plates 26 or the inner tooth plates 27; the plurality of outer friction plates 26 and the plurality of inner tooth plates 27 are provided with through holes, and a return spring 5 is installed at the through hole, and the two ends of the return spring 5 abut against the pressure dividing plate 24 and the thrust ring 28 respectively.

[0075] During use, hydraulic oil is fed into the hydraulic cavity through the hydraulic oil port 30, and the hydraulic oil pushes the hydraulic plunger 20 to move along the axial direction of the inner follower 16, thereby pushing the pressure dividing plate 24 to move to squeeze the multiple outer friction plates 26 and the multiple inner tooth plates 27 so that the multiple outer friction plates 26 and the multiple inner tooth plates 27 are pressed and fitted against each other, so that the connecting member 23 drives the inner follower 16 to rotate, thereby realizing the four-wheel drive combination, and at this time the return spring is in a compressed state;

[0076] When the hydraulic oil supply is stopped, the return spring 5 rebounds by its own elastic force, so that the multiple outer friction plates 26 and the multiple inner tooth plates 27 are separated from each other. At this time, the connecting member 23 and the outer follower 29 drive the multiple outer friction plates 26 to rotate around the axial direction of the inner follower, realizing the combination of two drives;

[0077] This solution has a simple structure and a reasonable design, and uses a thrust ring 28 to limit the movement of multiple outer friction plates 26 and multiple inner tooth plates 27.

[0078] Preferably, in this embodiment, the thrust ring 28 is preferably a circular plate-shaped structure.

[0079] Based on the above solution, the thrust ring 28 is threadedly sleeved on the inner follower 16 .

[0080] In addition, two through holes are provided in the thrust ring 28 in a radial direction and opposite to each other. Preferably, there are two spiral elastic pins 4, which are respectively passed through the two through holes, and the opposite ends thereof are respectively inserted into the insertion holes on the inner follower 16. The two spiral elastic pins 4 are provided in this solution to prevent the thrust ring 28 from loosening and further increase the stability of the thrust ring 28.

[0081] Example 7

[0082] On the basis of the above embodiments, in this embodiment, the inner follower 16 has a structure with one end being thick and the other end being thin, and the thick end thereof is close to the connecting member 23; a groove is provided at the thick end of the inner follower 16, and one end of the connecting member 23 extends into the groove and is connected to one end of the inner follower 16 through the connecting cylindrical pin 19.

[0083] This solution has a simple structure, and the shape of the inner follower 16 is reasonably designed, which is convenient for assembling various components and facilitating the coordination between various components.

[0084] Based on the above solution, the corresponding end of the connecting member 23 is rotatably connected to the connecting cylindrical pin 19 through the shaft sleeve 10.

[0085] Example 8

[0086] On the basis of Example 7, in this embodiment, a locking nut 6 is threadedly sleeved on one end of the connecting member 23, and a support plate 25 is sleeved on one end of the connecting member 23, and both ends of the support plate 25 are respectively abutted against the locking nut 6 and the external follower 29.

[0087] This solution has a simple structure and a reasonable design. The locking nut 6 and the support plate 25 are used to limit the assembly of the external follower 29, which is convenient for assembly.

[0088] Example 9

[0089] On the basis of any one of Examples 7 to 8, in this embodiment, an annular groove is provided at one end of the outer follower 29, and one end of the inner follower 16 extends into the annular groove; a thrust washer 21 is also installed in the annular groove, and both sides of the thrust washer 21 are respectively abutted against the inner side of the annular groove and the thrust ring 28.

[0090] This solution has a simple structure, the shape of the outer follower 29 is reasonably designed, and the thrust washer 21 is used for blocking.

[0091] Example 10

[0092] On the basis of the above-mentioned embodiments, this embodiment also provides a harvester, including the wet clutch four-wheel drive transfer case as described above.

[0093] This embodiment also provides a harvester, which has a reasonable layout, occupies a small space, is light in weight, and can achieve rapid switching of mechanical four-wheel drive, and the switching is convenient.

[0094] The working principle of the utility model is as follows:

[0095] During use, hydraulic oil is fed into the hydraulic cavity through the hydraulic oil port 30, and the hydraulic oil pushes the hydraulic plunger 20 to move along the axial direction of the inner follower 16, thereby pushing the pressure dividing plate 24 to move to squeeze the multiple outer friction plates 26 and the multiple inner tooth plates 27 so that the multiple outer friction plates 26 and the multiple inner tooth plates 27 are pressed and fitted against each other, so that the connecting member 23 drives the inner follower 16 to rotate, thereby realizing the four-wheel drive combination, and at this time the return spring is in a compressed state;

[0096] When the hydraulic oil supply is stopped, the return spring 5 rebounds by its own elastic force, so that the multiple outer friction plates 26 and the multiple inner tooth plates 27 are separated from each other. At this time, the connecting member 23 and the outer follower 29 drive the multiple outer friction plates 26 to rotate around the axial direction of the inner follower to achieve the combination of two drives.

[0097] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0098] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wet clutch four-wheel drive transfer case, characterized in that: The invention comprises a housing, a connecting member (23), an inner follower (16), an outer follower (29), a piston member, a plurality of outer friction plates (26) and a plurality of inner tooth plates (27), wherein the connecting member (23) and the inner follower (16) are coaxially mounted in the housing, and their ends close to each other are connected by a connecting cylindrical pin (19), and their ends far away from each other extend to the outside of the housing, respectively, and can rotate around their own axes; The plurality of inner tooth plates (27) are respectively coaxially sleeved on one end of the inner follower (16) close to the connecting member (23), and can rotate with the inner follower (16) and can slide along the axial direction of the inner follower (16); the plurality of outer friction plates (26) are respectively coaxially sleeved outside the inner follower (16), and are alternately and spacedly distributed with the plurality of inner tooth plates (27) in sequence, and can rotate around the axial direction of the inner follower (16); the outer follower (29) is fixedly sleeved on one end of the connecting member (23) close to the inner follower (16), and one end of the outer follower (29) is respectively engaged with the edges of the plurality of outer friction plates (26), and the plurality of outer friction plates (26) can slide along the axial direction of the outer follower (29); The piston member is coaxially slidably sleeved outside the inner follower (16), and its outer wall is slidably fitted with the outer shell, and a hydraulic cavity is formed between it and the outer shell; the outer shell is provided with a hydraulic oil port (30) connected to the hydraulic cavity, and hydraulic oil is injected into the hydraulic cavity through the hydraulic oil port (30) to push the piston member to squeeze the multiple outer friction plates (26) and the multiple inner tooth plates (27).

2. The wet clutch four-wheel drive transfer case according to claim 1, characterized in that: The housing comprises a clutch housing (17) and a housing cover (12); both ends of the clutch housing (17) are open, and the housing cover (12) is fixedly mounted on one open end of the clutch housing (17); the inner follower (16) passes through the housing cover (12) and is rotatably connected to the housing cover (12) via a support bearing; the connecting member (23) is rotatably mounted on the other open end of the clutch housing (17) via two connecting bearings (9).

3. The wet clutch four-wheel drive transfer case according to claim 2, characterized in that: Oil guide plates (2) are respectively provided at the other end of the clutch housing (17) corresponding to the two connecting bearings (9), and the two oil guide plates (2) are fixedly connected to the other end of the clutch housing (17) by a plurality of long screws (1); a shielding plate (3) is also provided at the other end of the clutch housing (17) near the external driven member (29), and the corresponding oil guide plate (2) is located between the shielding plate (3) and the external driven member (29).

4. The wet clutch four-wheel drive transfer case according to claim 2, characterized in that: The piston member comprises a hydraulic plunger (20) and a pressure dividing plate (24); the pressure dividing plate (24) is coaxially sleeved on the inner follower (16) and can slide along the axial direction of the inner follower (16), and one end of the pressure dividing plate abuts against the corresponding outer friction plate (26) or the inner gear plate (27); the hydraulic plunger (20) is coaxially sleeved outside the inner follower (16), and its outer side slides against the housing cover (12) and forms the hydraulic cavity between the housing cover (12); the hydraulic oil port (30) is distributed on the housing cover (12).

5. The wet clutch four-wheel drive transfer case according to claim 4, characterized in that: The hydraulic plunger (20) is slidably connected to the housing cover (12) via a plurality of elastic cylindrical pins (11).

6. The wet clutch four-wheel drive transfer case according to claim 4, characterized in that: A thrust ring (28) is coaxially fixedly installed at one end of the inner follower (16) close to the connecting member (23), and the thrust ring (28) is fixedly connected to the inner follower (16) through a plurality of spiral elastic pins (4); a plurality of the outer friction plates (26) and a plurality of the inner tooth plates (27) are located between the thrust ring (28) and the pressure dividing plate (24), and the thrust ring (28) abuts against the corresponding outer friction plates (26) or the inner tooth plates (27); a plurality of the outer friction plates (26) and a plurality of the inner tooth plates (27) are provided with through holes, and a return spring (5) is installed at the through hole, and the two ends of the return spring (5) abut against the pressure dividing plate (24) and the thrust ring (28) respectively.

7. The wet clutch four-wheel drive transfer case according to claim 6, characterized in that: The inner follower (16) has a structure with one end being thick and the other end being thin, and the thick end is close to the connecting member (23); a groove is provided at the thick end of the inner follower (16), and one end of the connecting member (23) extends into the groove and is connected to one end of the inner follower (16) via the connecting cylindrical pin (19).

8. The wet clutch four-wheel drive transfer case according to claim 7, characterized in that: A locking nut (6) is threadedly sleeved on one end of the connecting member (23), and a supporting plate (25) is sleeved on one end of the connecting member (23), and two ends of the supporting plate (25) are respectively in contact with the locking nut (6) and the external follower (29).

9. The wet clutch four-wheel drive transfer case according to claim 7, characterized in that: An annular groove is provided at one end of the outer follower (29), and one end of the inner follower (16) extends into the annular groove; a thrust washer (21) is also installed in the annular groove, and two sides of the thrust washer (21) are respectively in contact with the inner side of the annular groove and the thrust ring (28).

10. A harvester, characterized in that: It comprises a wet clutch four-wheel drive transfer case as described in any one of claims 1 to 9.

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