Hydraulic transmission with differential lock

Abstract

The utility model provides a kind of hydraulic gearbox with differential lock, including first shaft, second shaft, first bevel gear, second bevel gear, driven gear, two third bevel gears, locking ring, first elastic member, push disc, transmission gear and open-close drive assembly.Locking ring driven gear is axially sliding fit on driven gear, locking ring and driven gear have no relative rotation, and tooth can be engaged with first bevel gear.Push disc is fixedly connected with locking ring, and second outer tooth is engaged with first outer tooth transmission.Open-close drive assembly is used to drive transmission gear rotation, and push disc is moved towards driven gear side, to make tooth and first bevel gear engagement.Through the design of the first outer tooth of push disc and the second outer tooth of transmission gear are engaged transmission, power transmission is accurate and efficient, avoids the problem that push disc cannot synchronous response transmission gear action brings power transmission instability, and differential lock locking or unlocking failure, ensures stability and reliability in use process.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a hydraulic gearbox with a differential lock. Background Technology

[0002] Currently, traditional hydraulic gearboxes with differential locks typically employ a locking drive structure consisting of a "U-shaped groove on the outer periphery of the push block and a pin on the lever": when the handle is turned, the pin on the lever is inserted into the U-shaped groove of the push block, causing the push block to rotate and thus pushing the locking ring to mesh with the bevel gear on the half-shaft, thereby achieving synchronous rotation of the two half-shafts.

[0003] However, this structure has significant defects, such as poor reliability of power transmission. Specifically, the U-shaped groove and the pin are clearance fit. Under frequent operation or high torque conditions, the pin is prone to jamming or dislodging in the U-shaped groove, causing the push block to fail to respond synchronously to the handle's action, thus causing the differential lock to fail to lock or unlock. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a hydraulic transmission with a differential lock, so as to solve or at least alleviate one or more of the above-mentioned technical problems or other problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides a hydraulic transmission with a differential lock, comprising a first shaft and a second shaft coaxially arranged, a first bevel gear at one end of the first shaft and a second bevel gear at one end of the second shaft; a driven gear rotatably engaged on the first shaft and the second shaft, the driven gear being located between the first bevel gear and the second bevel gear; two third bevel gears rotatably mounted on the driven gear, the rotation axes of the third bevel gears being spatially perpendicular to the rotation axes of the driven gears, each of the third bevel gears meshing with the first bevel gear and the second bevel gear respectively; a locking ring mounted on the driven gear, movable along the axial direction of the driven gear and without relative rotation with the driven gear, the locking ring being located outside the first shaft, the locking ring having multiple teeth that can mesh with the first bevel gear;

[0006] A first elastic element applies elastic force to the locking ring, causing the locking ring to tend to move away from the driven gear; a push plate located outside the first shaft is movable along the axial direction of the first shaft, the push plate has an annular disc structure, the push plate is connected to the locking ring, and the outer peripheral wall of the push plate is provided with a first external tooth along its circumference; a transmission gear has a second external tooth on its outer peripheral wall along its circumference, the second external tooth meshing with the first external tooth; and an opening and closing drive assembly is used to drive the transmission gear to rotate and drive the push plate to move towards the driven gear, so that the teeth mesh with the first bevel gear.

[0007] Preferably, the driven gear has two first guide seats on its end face facing the locking ring, and the locking ring has two second guide seats. The second guide seats extend toward the driven gear and slide in cooperation with the corresponding first guide seats along the axial direction of the driven gear.

[0008] Preferably, the first guide seat is provided with a limiting groove, and the second guide seat is provided with a guide block, the guide block being slidably engaged in the corresponding limiting groove.

[0009] Preferably, the second guide seat is recessed in a direction away from the driven gear to form at least one receiving hole, and the end face of the driven gear facing the locking ring is provided with a plurality of grooves, each groove corresponding to one receiving hole; the number of the first elastic members corresponds to the number of the receiving holes, and the first elastic members are disposed in a corresponding pair of receiving holes and grooves.

[0010] Preferably, the number of the first elastic elements is four, and the four first elastic elements are arranged symmetrically in pairs along the center of the driven gear.

[0011] Preferably, the push plate has a plurality of first protrusions evenly distributed circumferentially on the end face away from the locking ring. Each first protrusion has a first inclined surface, which extends circumferentially along the push plate and spirals upward along the axis of the push plate. The opening and closing drive assembly includes a drive plate with an annular disc structure. The drive plate is located on the side of the push plate away from the locking ring. The end face of the drive plate facing the push plate has a plurality of second protrusions evenly distributed circumferentially. Each second protrusion has a second inclined surface, which extends circumferentially along the drive plate and spirals upward along the axis of the drive plate. The second inclined surface fits into the corresponding first inclined surface.

[0012] Preferably, the push plate is provided with annular reinforcing ribs, and the annular reinforcing ribs are respectively connected to each of the first protrusions.

[0013] Preferably, it further includes a housing, on which the first shaft and the second shaft are rotatably fitted. The driven gear, the locking ring, the first elastic element, the push plate, the transmission gear and the drive plate are all disposed inside the housing, and the drive plate and the housing are integrally formed.

[0014] Preferably, the opening and closing drive assembly further includes a handle disposed outside the housing, the handle being connected to the transmission gear.

[0015] Preferably, the opening and closing drive assembly further includes a second elastic element, which is used to apply elastic force to the handle so that the teeth remain separated from the first bevel gear.

[0016] The beneficial effects of this utility model are:

[0017] This utility model discloses a hydraulic transmission with a differential lock. Through a design where the first external tooth of the push plate meshes with the second external tooth of the transmission gear, power transmission is precise and efficient, transmitting rotational power with almost no loss. This avoids the instability in power transmission caused by the push plate's inability to respond synchronously to the transmission gear's movements, as well as the problems of differential lock locking or unlocking failure, ensuring stability and reliability during use. Because the first external tooth is directly machined on the outer circumference of the push plate, this integrated structural design effectively reduces the space occupied by the internal transmission structure of the transmission, making the overall structure of the transmission more compact. This solves the problem of the large size of existing transmissions due to complex transmission structures and large space requirements.

[0018] Meanwhile, by sliding the locking ring onto the driven gear, the movement trajectory of the locking ring can be precisely constrained, ensuring that the locking ring will not deviate or twist when moving along the axial direction of the driven gear. This ensures that the teeth of the locking ring and the grooves of the first bevel gear can be precisely aligned and meshed, thus avoiding the problem of locking failure. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0020] Figure 1 A schematic diagram of the structure of a hydraulic transmission with a differential lock provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure after the outer shell is hidden;

[0022] Figure 3 This is a schematic diagram of the structure of the push plate and the locking ring in action;

[0023] Figure 4 This is a schematic diagram of the locking ring structure;

[0024] Figure 5 This is a schematic diagram of the structure on the other side of the locking ring;

[0025] Figure 6 This is a schematic diagram of the push plate structure;

[0026] Figure 7 This is a schematic diagram of the structure in which the first external tooth and the second external tooth mate.

[0027] Figure 8 This is a schematic diagram of the driven gear on the side near the first shaft;

[0028] Figure 9 This is a schematic diagram of the structure in which the locking ring engages with the first bevel gear.

[0029] Figure 10 This is a schematic diagram of the structure when the teeth are separated from the first bevel gear.

[0030] Figure 11 for Figure 3 A cross-sectional schematic diagram under the condition;

[0031] Figure 12 This is a schematic diagram of the internal structure of the outer shell;

[0032] Figure 13 This is a schematic diagram of the drive disk structure;

[0033] Figure label:

[0034] 11. First shaft; 12. Second shaft; 13. First bevel gear; 14. Second bevel gear; 15. Driven gear; 151. First guide seat; 152. Limiting groove; 153. Groove; 16. Third bevel gear; 20. Locking ring; 21. Tooth; 22. Second guide seat; 23. Guide block; 24. Receiving hole; 30. First elastic element; 40. Push plate; 41. First external tooth; 42. First protrusion; 43. First inclined surface; 44. Annular reinforcing rib; 50. Transmission gear; 51. Second external tooth; 61. Drive plate; 62. Second protrusion; 63. Second inclined surface; 64. Handle; 65. Second elastic element; 70. Housing. Detailed Implementation

[0035] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0036] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] like Figure 1-13As shown, in one embodiment of this utility model, a hydraulic transmission with a differential lock is provided, including a first shaft 11, a second shaft 12, a first bevel gear 13, a second bevel gear 14, a driven gear 15, two third bevel gears 16, a locking ring 20, a first elastic element 30, a push plate 40, a transmission gear 50, and an opening / closing drive assembly. The first bevel gear 13, which does not rotate relative to it, is mounted at one end of the first shaft 11, and the second bevel gear 14, which also does not rotate relative to it, is mounted at one end of the second shaft 12. The driven gear 15 is rotatably engaged on the first shaft 11 and the second shaft 12. A power output assembly (not shown in the figures) is used to drive the driven gear 15 to rotate. The driven gear 15 is located between the first bevel gear 13 and the second bevel gear 14. The first shaft 11, the second shaft 12, the first bevel gear 13, the second bevel gear 14, and the driven gear 15 are arranged coaxially.

[0042] See Figure 8 Two third bevel gears 16 are rotatably mounted on the driven gear 15. The rotation axis of the third bevel gear 16 is spatially perpendicular to the rotation axis of the driven gear 15. Each third bevel gear 16 meshes with the first bevel gear 13 and the second bevel gear 14, respectively. When the equipment is running normally, power is transmitted to the third bevel gear 16 via the driven gear 15, and then the third bevel gear 16 drives the first bevel gear 13 and the second bevel gear 14 to rotate. If the resistance on both sides is different, the third bevel gear 16 will rotate around its own axis, realizing differential rotation between the first shaft 11 and the second shaft 12.

[0043] The locking ring 20 slides along the axial direction of the driven gear 15, with no relative rotation between the locking ring 20 and the driven gear 15. The locking ring 20 is sleeved on the outside of the first shaft 11, and its inner wall has multiple teeth 21 that can mesh with the first bevel gear 13. A first elastic element 30 is provided between the driven gear 15 and the locking ring 20, which always applies a spring force to the locking ring 20 in a direction away from the driven gear 15, keeping the teeth 21 of the locking ring 20 separated from the first bevel gear 13. The push plate 40 is also sleeved on the outside of the first shaft 11 and can move along the axial direction of the first shaft 11. The push plate 40 has an annular disc structure and is fixedly connected to the locking ring 20. The outer peripheral wall of the push plate 40 has first external teeth 41 along its circumference. The outer peripheral wall of the transmission gear 50 is provided with a second external tooth 51 along its circumference, and the second external tooth 51 meshes with the first external tooth 41 for transmission. The opening and closing drive assembly is used to drive the transmission gear 50 to rotate and drive the push plate 40 to move toward the driven gear 15 so that the teeth 21 mesh with the first bevel gear 13.

[0044] This embodiment discloses a hydraulic transmission with a differential lock. Through a design where the first external tooth 41 of the push plate 40 meshes with the second external tooth 51 of the transmission gear 50, power transmission is precise and efficient, transmitting rotational power with almost no loss. This avoids the instability in power transmission caused by the push plate 40's inability to respond synchronously to the movement of the transmission gear 50, as well as the problem of differential lock locking or unlocking failure, ensuring stability and reliability during use. Since the first external tooth 41 is directly machined on the outer periphery of the push plate 40, this integrated structural design effectively reduces the space occupied by the internal transmission structure of the transmission, making the overall structure of the transmission more compact. This solves the problem of the large size of transmissions in existing technologies due to complex transmission structures and large space requirements.

[0045] Meanwhile, by sliding the locking ring 20 onto the driven gear 15, the movement trajectory of the locking ring 20 can be precisely constrained, so that the locking ring 20 will not deviate or twist when it moves along the axial direction of the driven gear 15, ensuring that the teeth 21 and the tooth groove of the first bevel gear 13 can be precisely aligned and meshed, thus avoiding the problem of locking failure.

[0046] In one embodiment, the driven gear 15 has two first guide seats 151 on its end face facing the locking ring 20, and the locking ring 20 has two second guide seats 22. The second guide seats 22 extend toward the driven gear 15 and slide in engagement with the corresponding first guide seats 151 along the axial direction of the driven gear 15. The first guide seats 151 and the driven gear 15, as well as the second guide seats 22 and the locking ring 20, are all integrally formed. When the locking ring 20 moves axially along the driven gear 15 under the push of the pusher 40, the second guide seats 22 always slide under the constraint of the first guide seats 151. This effectively limits the radial offset of the locking ring 20 and avoids the problem of inaccurate meshing between the teeth 21 and the first bevel gear 13 due to the shaking of the locking ring 20. At the same time, the sliding engagement structure is simple and does not require additional complex positioning components, thus reducing manufacturing costs while ensuring guiding accuracy.

[0047] Furthermore, the first guide seat 151 is provided with a limiting groove 152, and the second guide seat 22 is provided with a guide block 23. The guide block 23 is slidably engaged in the corresponding limiting groove 152. The guide block 23 is embedded in the limiting groove 152, forming a surface-to-surface contact engagement, which can effectively prevent the locking ring 20 from twisting or tilting during movement. This ensures that the teeth 21 of the locking ring 20 are completely aligned with the tooth grooves of the first bevel gear 13, improving the smoothness of meshing and the reliability of locking, and thus improving the guiding accuracy.

[0048] In one embodiment, the second guide seat 22 is recessed in a direction away from the driven gear 15 to form two receiving holes 24. The end face of the driven gear 15 facing the locking ring 20 is provided with four grooves 153, each groove 153 corresponding to one receiving hole 24. The number of first elastic members 30 corresponds to the number of receiving holes 24, and the first elastic members 30 are disposed in the corresponding pair of receiving holes 24 and grooves 153. Through the cooperation of the receiving holes 24 and grooves 153, the first elastic members 30 are accurately positioned and fixed, preventing the first elastic members 30 from shifting or falling off during operation, ensuring that they always apply a stable elastic force to the locking ring 20, and ensuring the reliability of the locking ring 20's reset. At the same time, the structure of the receiving holes 24 and grooves 153 makes the installation of the first elastic members 30 not occupy additional space, and the connection between the first elastic members 30, the locking ring 20, and the driven gear 15 is more compact, saving installation space inside the gearbox.

[0049] In one embodiment, there are four first elastic elements 30, arranged symmetrically in pairs around the center of the driven gear 15. This structural design ensures that the locking ring 20 is subjected to uniform force, preventing the locking ring 20 from failing to reset in time due to uneven force distribution. Simultaneously, the uniform elastic force distribution also reduces frictional wear between the first guide seat 151 and the second guide seat 22, extending their service life.

[0050] In one embodiment, the push plate 40 has a plurality of first protrusions 42 evenly distributed circumferentially on the end face away from the locking ring 20. Each first protrusion 42 has a first inclined surface 43 extending circumferentially along the push plate 40 and spirally ascending along the axis of the push plate 40. The opening / closing drive assembly includes a drive disc 61 with an annular disc structure. The drive disc 61 is located on the side of the push plate 40 away from the locking ring 20. The end face of the drive disc 61 facing the push plate 40 has a plurality of second protrusions 62 evenly distributed circumferentially. Each second protrusion 62 has a second inclined surface 63 extending circumferentially along the drive disc 61 and spirally ascending along the axis of the drive disc 61. The second inclined surface 63 is in contact with the corresponding first inclined surface 43.

[0051] When the driven gear 15 drives the push plate 40 to rotate, the first inclined surface 43 of the first protrusion 42 engages with the second inclined surface 63 of the second protrusion 62, which is converted into axial movement of the push plate 40. This transmission structure requires only a small rotational driving force to push the push plate 40 to generate a large axial thrust. Combined with the efficient transmission of the first external tooth 41 of the push plate 40 and the second external tooth 51 of the transmission gear 50, it further reduces the force required to rotate the transmission gear 50 and improves the ease of operation. At the same time, the engagement of the helical inclined surfaces makes the movement speed of the push plate 40 uniform and controllable, avoiding rigid collision between the locking ring 20 and the first bevel gear 13 due to rapid movement, reducing wear on the teeth 21, and extending the service life of the locking components.

[0052] In one embodiment, the pusher plate 40 is provided with annular reinforcing ribs 44, which are connected to each of the first protrusions 42. The annular reinforcing ribs 44, the pusher plate 40, and the first protrusions 42 are integrally formed. During operation, the pusher plate 40 not only needs to transmit rotational power through the first external teeth 41, but also needs to withstand the axial thrust transmitted by the helical inclined plane, making it prone to deformation. The annular reinforcing ribs 44 connect all the first protrusions 42 into a whole, forming a rigid frame, which can effectively disperse the stress on the pusher plate 40, avoid the pusher plate 40 from breaking due to excessive force, and ensure the structural stability of the pusher plate 40.

[0053] In one embodiment, the hydraulic gearbox further includes a housing 70, on which the first shaft 11 and the second shaft 12 are rotatably fitted. The driven gear 15, locking ring 20, first elastic element 30, push plate 40, transmission gear 50, and drive plate 61 are all housed within the housing 70, with the drive plate 61 and housing 70 forming an integral structure. This integral design of the drive plate 61 and housing 70 provides greater structural rigidity compared to a detachable connection, effectively preventing displacement or wobbling of the drive plate 61 during operation. This ensures the precision of the fit between the first inclined surface 43 and the second inclined surface 63, thereby ensuring the stability of the push plate 40's movement. Simultaneously, it simplifies the assembly process and reduces manufacturing costs.

[0054] In one embodiment, the opening and closing drive assembly further includes a handle 64 disposed outside the housing 70. The handle 64 is fixedly connected to the transmission gear 50 and does not rotate relative to the transmission gear 50. The operator directly drives the transmission gear 50 to rotate via the external handle 64. The transmission gear 50 then drives the push plate 40 to rotate through the meshing of the second external tooth 51 and the first external tooth 41. The first inclined surface 43 on the push plate 40 cooperates with the second inclined surface 63 on the drive plate 61, thereby realizing the movement of the push plate 40 and the locking ring 20, thus realizing the locking and unlocking of the differential lock and improving the response speed of the equipment. At the same time, the operator can judge the locking status by the rotation angle of the handle 64, improving the accuracy of operation.

[0055] In one embodiment, the opening / closing drive assembly further includes a second elastic element 65, which applies a spring force to the handle 64 to keep the teeth 21 of the locking ring 20 separated from the first bevel gear 13. The second elastic element 65 allows the handle 64 to remain in a fixed position when not in operation, preventing the handle 64 from rotating on its own due to equipment vibration, preventing the differential lock from locking accidentally, and improving the safety of the gearbox operation.

[0056] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A hydraulic transmission with a differential lock, characterized in that, include: A first shaft (11) and a second shaft (12) are arranged coaxially. One end of the first shaft (11) is provided with a first bevel gear (13), and one end of the second shaft (12) is provided with a second bevel gear (14). Driven gear (15) is rotatably fitted on the first shaft (11) and the second shaft (12), and the driven gear (15) is located between the first bevel gear (13) and the second bevel gear (14); Two third bevel gears (16) are rotatably mounted on the driven gear (15). The rotation axis of the third bevel gear (16) is spatially perpendicular to the rotation axis of the driven gear (15). Each third bevel gear (16) meshes with the first bevel gear (13) and the second bevel gear (14), respectively. A locking ring (20) is provided on the driven gear (15), which can move along the axial direction of the driven gear (15) and has no relative rotation with the driven gear (15). The locking ring (20) is located outside the first shaft (11), and the locking ring (20) is provided with a plurality of teeth (21), which can mesh with the first bevel gear (13). A first elastic element (30) is used to apply elastic force to the locking ring (20) so that the locking ring (20) tends to move away from the driven gear (15); A push plate (40) is provided outside the first shaft (11) and can move along the axial direction of the first shaft (11). The push plate (40) has an annular disc structure and is connected to the locking ring (20). The outer peripheral wall of the push plate (40) is provided with a first external tooth (41) along its circumference. A transmission gear (50) has a second external tooth (51) on its outer peripheral wall along its circumference, the second external tooth (51) meshing with the first external tooth (41) for transmission; and The opening and closing drive assembly is used to drive the transmission gear (50) to rotate and drive the push plate (40) to move toward the driven gear (15) so that the teeth (21) mesh with the first bevel gear (13).

2. The hydraulic transmission with differential lock according to claim 1, characterized in that, The driven gear (15) has two first guide seats (151) on its end face facing the locking ring (20), and the locking ring (20) has two second guide seats (22). The second guide seats (22) extend toward the driven gear (15), and the second guide seats (22) slide in cooperation with the corresponding first guide seats (151) along the axial direction of the driven gear (15).

3. The hydraulic transmission with differential lock according to claim 2, characterized in that, The first guide seat (151) is provided with a limiting groove (152), and the second guide seat (22) is provided with a guide block (23). The guide block (23) slides in the corresponding limiting groove (152).

4. The hydraulic transmission with differential lock according to claim 2, characterized in that, The second guide seat (22) is recessed in a direction away from the driven gear (15) to form at least one receiving hole (24). The driven gear (15) has a plurality of grooves (153) on its end face facing the locking ring (20), and each groove (153) corresponds to one receiving hole (24). The number of the first elastic members (30) corresponds to the number of the receiving holes (24), and the first elastic members (30) are provided in a corresponding pair of receiving holes (24) and grooves (153).

5. The hydraulic transmission with differential lock according to claim 4, characterized in that, The number of the first elastic element (30) is four, and the four first elastic elements (30) are arranged symmetrically in pairs along the center of the driven gear (15).

6. The hydraulic transmission with differential lock according to any one of claims 1 to 5, characterized in that, The push plate (40) has a plurality of first protrusions (42) evenly distributed circumferentially on the end face away from the locking ring (20). The first protrusions (42) are provided with a first inclined surface (43). The first inclined surface (43) extends along the circumferential direction of the push plate (40) and is arranged in a spiral upward manner along the axis of the push plate (40). The opening and closing drive assembly includes a drive disk (61) with a ring-shaped disc structure. The drive disk (61) is located on the side of the push plate (40) away from the locking ring (20). The end face of the drive disk (61) facing the push plate (40) has a plurality of second protrusions (62) evenly distributed in the circumferential direction. The second protrusions (62) are provided with second inclined surfaces (63). The second inclined surfaces (63) extend along the circumferential direction of the drive disk (61) and are arranged in a spiral upward manner along the axis of the drive disk (61). The second inclined surfaces (63) are in contact with the corresponding first inclined surfaces (43).

7. The hydraulic transmission with differential lock according to claim 6, characterized in that, The push plate (40) is provided with annular reinforcing ribs (44), and the annular reinforcing ribs (44) are respectively connected to each of the first protrusions (42).

8. The hydraulic transmission with differential lock according to claim 6, characterized in that, It also includes a housing (70), the first shaft (11) and the second shaft (12) are rotatably fitted on the housing (70), the driven gear (15), the locking ring (20), the first elastic element (30), the push plate (40), the transmission gear (50) and the drive plate (61) are all located inside the housing (70), and the drive plate (61) and the housing (70) are integrally formed.

9. The hydraulic transmission with differential lock according to claim 8, characterized in that, The opening and closing drive assembly also includes a handle (64) disposed outside the housing (70), the handle (64) being connected to the transmission gear (50).

10. The hydraulic transmission with differential lock according to claim 9, characterized in that, The opening and closing drive assembly further includes a second elastic element (65) for applying elastic force to the handle (64) so ​​that the teeth (21) remain separated from the first bevel gear (13).

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