A hydrodynamic gearbox

Abstract

The utility model discloses a kind of hydraulic gearbox, including hydraulic torque converter, box and the turbine shaft being arranged in box, forward clutch, reverse clutch, high-speed clutch, one clutch, two clutches and three clutches;Hydraulic torque converter includes: cover wheel, pump wheel, turbine, guide wheel, turbine spline sleeve, oil inlet axle sleeve and lock clutch, lock clutch includes: end plate, friction plate, spacer, piston, guide pin and bumper assembly;The utility model is to avoid intermediate link energy loss in the hydraulic torque converter of hydraulic gearbox Lock clutch is increased, avoid the impact caused when lock clutch is combined, increase bumper assembly, when entering coupling area, lock clutch is combined, engine is directly connected with turbine shaft Reduce intermediate link energy loss effectively reduce energy consumption, and the structure of hydraulic gearbox is more compact.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to a hydraulic gearbox. Background Technology

[0002] With the development of my country's logistics economy, forklifts are becoming more widely used, and the design and manufacturing of forklift transmission components are gradually maturing. Hydraulic transmissions are increasingly widely used in forklifts. The torque converter in a hydraulic transmission mainly consists of three components: a pump impeller, a turbine, and a guide wheel. The torque converter relies on the swirling of oil to transmit power, resulting in low power transmission efficiency, typically less than 80%. Some of the energy output from the engine is consumed in the churning of the oil, leading to ineffective power transmission to the drive wheels, significant efficiency loss, and low fuel economy.

[0003] Referring to the Chinese patent publication CN206092866U entitled "Multi-gear hydraulic transmission gearbox for engineering vehicles", this multi-gear hydraulic transmission gearbox for engineering vehicles includes a hydraulic torque converter, an oil pump assembly, and a housing. The inner cavity of the housing is provided with a reverse gear group, a second and third gear group, and an output gear group arranged in a staggered triangular pattern and connected to each other. The hydraulic torque converter is connected to the reverse gear group. The oil pump assembly is mounted on the outer wall of the housing and is connected to the reverse gear group and the second and third gear groups through an oil circuit. The hydraulic torque converter of this gearbox can only transmit power by the swirl of oil, resulting in low power transmission efficiency. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this utility model is to provide a hydraulic transmission in which the engine directly transmits power to the turbine by engaging a lock-up clutch in the medium-to-high speed range, thereby improving transmission efficiency, while the shock generated during the lock-up process is absorbed by a damper assembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulic transmission includes a hydraulic torque converter, a housing, and a turbine shaft disposed within the housing, a forward clutch, a reverse clutch, a high-speed clutch, a first-gear clutch, a second-gear clutch, and a third-gear clutch.

[0007] The hydraulic torque converter includes: a cover wheel, a pump wheel, a turbine, a guide wheel, a turbine spline sleeve, an oil inlet bushing, and a lock-up clutch. The lock-up clutch includes: an end plate, friction plates, partition plates, a piston, a guide pin, and a damper assembly.

[0008] The cover wheel is used to receive the torque transmitted by the engine. The pump wheel is fixedly connected to the cover wheel. The cover wheel is connected to the turbine spline sleeve through a bearing. The guide wheel is splinedly connected to the oil inlet sleeve. The pump wheel is connected to the oil inlet sleeve through a bearing. The turbine is fixed on the turbine spline sleeve. The turbine shaft is splinedly connected to the turbine spline sleeve. The empty sleeve is fitted on the oil inlet sleeve. The end plate is fixedly connected to the cover wheel. The cover wheel has a spline on its circumferential inner side. The cover wheel has a piston chamber for the piston on its radial inner side. The partition plate and the piston are splinedly connected to the circumferential inner side of the cover wheel. The partition plate and the piston are sleeved on the guide pin and can move axially relative to the guide pin. One end of the guide pin is installed on the inner side of the cover wheel. The end plate is fixedly fitted on the other end of the guide pin. Friction plates and partition plates are alternately arranged between the end plate and the piston. The inner spline of the friction plate is connected to a damper assembly. The damper assembly is splinedly connected to the turbine spline sleeve. The damper assembly is used to absorb the torque variation between the cover wheel and the turbine spline sleeve when the above-mentioned lock-up clutch is in the engaged state.

[0009] The forward clutch, reverse clutch, high-speed clutch, first gear clutch, second gear clutch, and third gear clutch are located below the turbine shaft and are connected to the turbine shaft drive.

[0010] In some embodiments, the buffer assembly includes an active plate, a spring, and a driven plate. The active plate is spline-connected to the friction plate and can rotate synchronously with the friction plate. The driven plate is spline-connected to the turbine spline sleeve and can rotate synchronously with the turbine spline sleeve. The spring is installed between the active plate and the driven plate.

[0011] In some embodiments, the cover wheel is connected to the turbine spline sleeve via bearing A. Bearing A and the driven plate are arranged side by side, and a spacer is provided between them to fix the position of the driven plate.

[0012] In some embodiments, a connecting plate is fixedly connected to the outer side of the shield wheel away from the pump wheel. The connecting plate is annular, and a shaft head flange is fixedly connected to the center of the annular ring. The shaft head flange is used to connect the output shaft of the engine.

[0013] In some embodiments, the outer edge of the pump wheel and the outer edge of the cover wheel are fixedly connected by hexagonal bolts A, and a sealing ring A is installed on the inner side of the connection between the two.

[0014] In some embodiments, the system further includes a PTO output gear, a PTO intermediate shaft gear, and a PTO input gear. The PTO input gear is connected to the pump wheel drive, the PTO intermediate shaft gear meshes with the PTO input gear, and the PTO intermediate shaft gear meshes with the PTO output gear.

[0015] In some embodiments, the system further includes an oil pump, with the PTO intermediate shaft gear connected to the oil pump, the hydraulic torque converter located on one side of the PTO input gear, and the oil pump located on the other side of the PTO input gear and connected to the oil inlet sleeve.

[0016] In some embodiments, the PTO output gear, the PTO intermediate shaft gear, and the PTO input gear are arranged sequentially from top to bottom.

[0017] In some embodiments, the pump wheel is connected to the oil inlet bushing via bearing B, bearing B is fitted with a bearing housing, the pump wheel is fixedly connected to the bearing housing, the bearing housing is provided with a spline, and the PTO input gear is connected to the spline of the bearing housing.

[0018] In some embodiments, the forward clutch is located below the turbine shaft and is connected to the turbine shaft for transmission. The first gear drive shaft is coaxial with the forward clutch, and the first gear clutch is located below the first gear drive shaft. The second gear clutch and the reverse clutch are located below the forward clutch. The second gear clutch is located between the first gear clutch and the reverse clutch. The high-speed clutch is located below the reverse clutch. The third gear clutch is located below the second gear clutch. The output gear is located below the first gear clutch. The output flange is located on the side of the output gear away from the third gear clutch. The idler gear is located below the high-speed clutch.

[0019] This utility model has the following beneficial effects:

[0020] This utility model discloses a hydraulic torque converter in a hydraulic transmission with a lock-up clutch. By employing a wet multi-plate clutch structure and a damper assembly, power is directly transmitted to the turbine when the engine is in the medium-to-high speed range by engaging the lock-up clutch, improving transmission efficiency, reducing oil churning losses in the torque converter, and enhancing the torque converter's power responsiveness. To avoid the impact caused by the lock-up clutch engagement, a damper assembly is added to absorb the impact during the lock-up process. When entering the coupling region, the lock-up clutch engages, and the engine directly connects to the turbine shaft, reducing energy losses in intermediate stages and effectively reducing energy consumption. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the hydraulic transmission in an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the hydraulic torque converter in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. PTO output gear; 2. PTO intermediate shaft gear; 3. Hydraulic torque converter; 4. PTO input gear; 31. Pump wheel; 32. Turbine; 33. Seal A; 34. Hex bolt A; 35. End plate; 36. Friction plate; 37. Partition plate; 38. Piston; 39. Guide pin; 310. Seal B; 311. Cover wheel; 312. Buffer assembly; 3121. Driving plate; 3122. Driven plate; 313. Seal C; 314. Connecting plate; 315. Pad plate 316. Bolt; 317. Spacer; 318. Turbine spline sleeve; 319. Sealing ring A; 320. Bearing A; 321. O-ring A; 322. Hex bolt B; 323. Guide wheel; 324. Bearing housing pad; 325. Hex bolt C; 326. Bearing B; 327. Sealing ring B; 328. Bearing housing; 329. Oil inlet bushing; 330. Shaft head flange; 21. Oil pump; 5. Turbine shaft; 7. First gear drive shaft gear; 16. Output gear; 17. Idler gear. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0026] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] refer to Figures 1-2The hydraulic transmission of this utility model embodiment includes a hydraulic torque converter 3, a housing and a turbine shaft 5 disposed in the housing, a forward clutch, a reverse clutch, a high-speed clutch, a first gear clutch, a second gear clutch and a third gear clutch.

[0030] The hydraulic torque converter 3 includes: a cover wheel 311, a pump wheel 31, a turbine 32, a guide wheel 323, a turbine spline sleeve 318, an oil inlet bushing 329, and a lock-up clutch. The lock-up clutch includes: an end plate 35, a friction plate 36, a partition plate 37, a piston 38, a guide pin 39, and a damper assembly 312.

[0031] The cover wheel 311 is used to receive the torque transmitted by the engine. The pump wheel 31 is fixedly connected to the cover wheel 311. The cover wheel 311 is connected to the turbine spline sleeve 318 through a bearing. The guide wheel 323 is splinedly connected to the oil inlet sleeve 329. The pump wheel 31 is connected to the oil inlet sleeve 329 through a bearing. The turbine 32 is fixed on the turbine spline sleeve 318. The turbine shaft 5 is splinedly connected to the turbine spline sleeve 318 and is loosely fitted on the oil inlet sleeve 329. The end plate 35 is fixedly connected to the cover wheel 311. The cover wheel 311 has a spline on its circumferential inner side. The piston chamber of the piston 38 is provided on the radial inner side of the cover wheel 311. The partition 37 and the piston 38 are connected to the cover wheel 311. The inner spline connection is provided, and the partition plate 37 and piston 38 are sleeved on the guide pin 39, which can move axially relative to the guide pin 39. One end of the guide pin 39 is installed inside the cover wheel 311, and the end plate 35 is fixedly sleeved on the other end of the guide pin 39. The friction plate 36 and the partition plate 37 are alternately arranged between the end plate 35 and the piston 38. The inner spline connection of the friction plate 36 is a damper assembly 312. The damper assembly 312 is splinedly connected to the turbine spline sleeve 318. The damper assembly 312 is used to absorb the torque variation between the cover wheel 311 and the turbine spline sleeve 318 when the lock-up clutch is in the engaged state.

[0032] The forward clutch, reverse clutch, high-speed clutch, first gear clutch, second gear clutch and third gear clutch are located below the turbine shaft 5 and are connected to the turbine shaft 5 for transmission.

[0033] In this embodiment, the forward clutch gear and the forward clutch hub gear are combined through a friction plate assembly to form a forward clutch KF. The forward clutch gear meshes with the turbine shaft for transmission. When the forward clutch is engaged, the forward clutch gear and the forward clutch hub gear are engaged and rotate synchronously. The first gear drive shaft gear 7 is fixedly connected to the forward clutch hub gear and rotates synchronously. The first gear clutch gear meshes with the first gear drive shaft gear 7 for transmission. The first gear clutch gear and the first gear clutch hub gear are combined through a friction plate assembly to form a first gear clutch K1. When the first gear clutch is engaged, the first gear clutch gear and the first gear clutch hub gear are engaged and rotate synchronously. The first gear clutch hub gear meshes with the output gear 16 for transmission. The output gear 16 is fixedly connected to the output flange outside the housing and rotates synchronously. The reverse clutch gear meshes with the turbine shaft for transmission. The reverse clutch gear and the reverse / second gear clutch hub gear are combined through a friction plate assembly to form a reverse clutch KR. When the reverse clutch is engaged, the reverse clutch gear and the reverse / second gear clutch hub gear... The first gear clutch hub gear engages and rotates synchronously with the reverse / second gear clutch hub gear. The third gear clutch hub gear and output gear 16 are connected via a friction plate assembly to form the third gear clutch K3. When the third gear clutch is engaged, the third gear clutch hub gear and output gear 16 are engaged and rotate synchronously. The reverse / second gear clutch hub gear and first gear clutch hub gear are connected via a friction plate assembly to form the second gear clutch K2. When the second gear clutch is engaged, the reverse / second gear clutch hub gear and first gear clutch hub gear are engaged and rotate synchronously. The forward clutch hub gear engages and rotates synchronously with the reverse / second gear clutch hub gear. The high-speed / third gear clutch gear and third gear clutch hub gear are connected via a friction plate assembly to form the high-speed clutch KFH. When the high-speed clutch is engaged, the high-speed / third gear clutch gear and third gear clutch hub gear are engaged and rotate synchronously. The high-speed / third gear clutch gear engages and rotates synchronously with the idler gear 17, and the idler gear 17 engages and rotates synchronously with the forward clutch gear.

[0034] In this embodiment and some other embodiments, the forward clutch is located below the turbine shaft 5 and is connected to the turbine shaft 5 for transmission. The first gear drive shaft 7 is coaxially arranged with the forward clutch, and the first gear clutch is located below the first gear drive shaft 7. The second gear clutch and the reverse clutch are located below the forward clutch, and the second gear clutch is located between the first gear clutch and the reverse clutch. The high-speed clutch is located below the reverse clutch, the third gear clutch is located below the second gear clutch, the output gear 16 is located below the first gear clutch, the output flange is located on the side of the output gear 16 away from the third gear clutch, and the idler gear 17 is located below the high-speed clutch.

[0035] In this embodiment and some other embodiments, the buffer assembly 312 includes an active plate 3121, a spring, and a driven plate 3122. The active plate 3121 is spline-connected to the friction plate 36 and can rotate synchronously with the friction plate 36. The driven plate 3122 is spline-connected to the turbine spline sleeve 318 and can rotate synchronously with the turbine spline sleeve 318. The spring is installed between the active plate 3121 and the driven plate 3122.

[0036] In this embodiment and some other embodiments, the cover wheel 311 is connected to the turbine spline sleeve 318 via bearing A320. Bearing A and driven plate 3122 are arranged side by side, and a spacer 317 is provided between them to fix the position of driven plate 3122.

[0037] In this embodiment and some other embodiments, a connecting plate 314 is fixedly connected to the outer side of the cover wheel 311 away from the pump wheel 31. The connecting plate 314 is annular, and a shaft head flange 330 is fixedly connected to the center of the annulus. The shaft head flange 330 is used to connect the output shaft of the engine. The connecting plate 314 is fixedly connected to the shaft head flange 330 by bolts 316, and a gasket 315 is placed between the bolts 316 and the connecting plate 314. The inner circumferential side of the shaft head flange 330 abuts against the turbine spline sleeve 318, and a sealing ring A319 is provided at the abutment. The outer circumferential side of the shaft head flange 330 abuts against the inner circumferential side of the cover wheel 311, and an O-ring A321 is provided at the abutment. The turbine 32 is fixed to the turbine spline sleeve 318 by hexagonal bolts B322.

[0038] In this embodiment and some other embodiments, the outer edge of the pump wheel 31 and the outer edge of the cover wheel 311 are fixedly connected by hexagonal bolts A34, and a sealing ring A33 is installed on the inner side of the connection between the two.

[0039] In this embodiment and some other embodiments, the hydraulic gearbox further includes a PTO output gear 1, a PTO intermediate shaft gear 2, and a PTO input gear 4. The PTO input gear 4 is connected to the pump wheel 31 for transmission. The PTO intermediate shaft gear 2 meshes with the PTO input gear 4 for transmission, and the PTO intermediate shaft gear 2 meshes with the PTO output gear 1 for transmission.

[0040] In this embodiment and some other embodiments, the hydraulic transmission also includes an oil pump 21, the PTO intermediate shaft gear 2 is connected to the oil pump 21, the hydraulic torque converter 3 is located on one side of the PTO input gear 4, and the oil pump 21 is located on the other side of the PTO input gear 4 and is connected to the oil inlet sleeve 329.

[0041] In this embodiment and some other embodiments, the PTO output gear 1, the PTO intermediate shaft gear 2, and the PTO input gear 4 are arranged sequentially from top to bottom.

[0042] In this embodiment and some other embodiments, the pump wheel 31 is connected to the oil inlet sleeve 329 via bearing B326. A bearing housing 328 is fitted onto bearing B326, and the pump wheel 31 is fixedly connected to the bearing housing 328. The bearing housing 328 is provided with a spline, and the PTO input gear 4 is splinedly connected to the bearing housing 328. In this embodiment, the pump wheel 31 and the bearing housing 328 are fixedly connected by hexagonal bolts C325 and a bearing housing pad 324. A sealing ring B327 is installed in the gap between the inner circumference of the bearing housing 328 and the oil inlet sleeve 329. In this embodiment, bearing B326 is a cylindrical roller bearing.

[0043] In this embodiment, a sealing ring B310 is installed in the gap between the outer peripheral side of the piston 38 and the piston cavity, and a sealing ring C313 is installed in the gap between the inner peripheral side of the piston 38 and the piston cavity.

[0044] The transmission principle of the hydraulic torque converter in the hydraulic gearbox of this embodiment:

[0045] Power output route when the locking structure is not activated: Connecting plate 314 → Pump wheel 31 → Guide wheel 323 → Turbine 32 → Turbine spline sleeve 318 → Turbine shaft 5;

[0046] When the locking structure is activated, the power output route is: connecting plate 314 → pump wheel 31 → friction plate 36, partition plate 37 → shock absorber assembly 312 → turbine spline sleeve 318 → turbine shaft 5.

[0047] When the lock-up is not engaged: the engine drives the torque converter connecting plate 314 to rotate, which transmits power to the pump wheel 31. The pump wheel 31 transmits energy to the turbine 32 through the oil by rotating. The guide wheel 323 is set between the pump wheel 31 and the turbine 32 to increase the torque. Finally, the power is transmitted to the turbine shaft 5 through the turbine spline sleeve 318.

[0048] When the lock-up is engaged: the engine drives the torque converter connecting plate 314 to rotate, transmitting power to the pump wheel 31. At this time, the hydraulic oil pushes the piston 38 to move, pressing the friction plate 36 and the partition plate 37 together, so that the pump wheel 31 is connected to the damper assembly 312. The damper assembly 312 transmits power directly to the turbine spline sleeve 318 through the internal spline, and finally transmits the power to the turbine shaft 5.

[0049] Advantages of the hydraulic transmission in this embodiment of the utility model:

[0050] Reduce energy consumption and improve fuel economy;

[0051] Compact structure;

[0052] Improve the response speed of the torque converter.

[0053] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A hydraulic transmission, characterized in that, Includes a hydraulic torque converter (3), a housing and a turbine shaft (5) installed inside the housing, a forward clutch, a reverse clutch, a high-speed clutch, a first-gear clutch, a second-gear clutch and a third-gear clutch; The hydraulic torque converter (3) includes: a cover wheel (311), a pump wheel (31), a turbine (32), a guide wheel (323), a turbine spline sleeve (318), an oil inlet bushing (329), and a lock-up clutch. The lock-up clutch includes: an end plate (35), a friction plate (36), a partition plate (37), a piston (38), a guide pin (39), and a damper assembly (312). The cover wheel (311) is used to receive the torque transmitted by the engine. The pump wheel (31) is fixedly connected to the cover wheel (311). The cover wheel (311) is connected to the turbine spline sleeve (318) through a bearing. The guide wheel (323) is splinedly connected to the oil inlet sleeve (329). The pump wheel (31) is connected to the oil inlet sleeve (329) through a bearing. The turbine (32) is fixed on the turbine spline sleeve (318). The turbine shaft (5) is splinedly connected to the turbine spline sleeve (318) and is loosely fitted on the oil inlet sleeve (329). The end plate (35) is fixedly connected to the cover wheel (311). The cover wheel (311) has a spline on its circumferential inner side. The piston chamber of the piston (38) is provided on the radial inner side of the cover wheel (311). The partition (37) and the piston (38) are connected to the cover wheel (311). The inner spline of the circumferential side of the clutch is connected, and the partition (37) and piston (38) are sleeved on the guide pin (39) and can move axially relative to the guide pin (39). One end of the guide pin (39) is installed inside the cover wheel (311), and the end plate (35) is fixedly sleeved on the other end of the guide pin (39). The friction plate (36) and the partition (37) are alternately arranged between the end plate (35) and the piston (38). The inner spline of the friction plate (36) is connected to the damper assembly (312). The damper assembly (312) is spline connected to the turbine spline sleeve (318). The damper assembly (312) is used to absorb the torque variation between the cover wheel (311) and the turbine spline sleeve (318) when the above-mentioned lock-up clutch is in the connected state. The forward clutch, reverse clutch, high-speed clutch, first gear clutch, second gear clutch and third gear clutch are located below the turbine shaft (5) and are connected to the turbine shaft (5) for transmission.

2. A hydraulic transmission as described in claim 1, characterized in that, The buffer assembly (312) includes an active plate (3121), a spring, and a driven plate (3122). The active plate (3121) is splinedly connected to the friction plate (36) and can rotate synchronously with the friction plate (36). The driven plate (3122) is splinedly connected to the turbine spline sleeve (318) and can rotate synchronously with the turbine spline sleeve (318). The spring is installed between the active plate (3121) and the driven plate (3122).

3. A hydraulic transmission as described in claim 2, characterized in that, The cover wheel (311) is connected to the turbine spline sleeve (318) via bearing A (320). Bearing A (320) and driven plate (3122) are arranged side by side, and a spacer (317) is provided between them to fix the position of driven plate (3122).

4. A hydraulic transmission as described in claim 1, characterized in that, A connecting plate (314) is fixedly connected to the outer side of the cover wheel (311) away from the pump wheel (31). The connecting plate (314) is annular, and a shaft head flange (330) is fixedly connected to the center of the annular ring. The shaft head flange (330) is used to connect the output shaft of the engine.

5. A hydraulic transmission as described in claim 1, characterized in that, The outer edge of the pump wheel (31) is fixedly connected to the outer edge of the cover wheel (311) by a hexagonal bolt A (34), and a sealing ring A (33) is installed on the inner side of the connection between the two.

6. A hydraulic transmission as described in claim 1, characterized in that, It also includes a PTO output gear (1), a PTO intermediate shaft gear (2), and a PTO input gear (4). The PTO input gear (4) is connected to the pump wheel (31) for transmission. The PTO intermediate shaft gear (2) meshes with the PTO input gear (4) for transmission. The PTO intermediate shaft gear (2) meshes with the PTO output gear (1) for transmission.

7. A hydraulic transmission as described in claim 6, characterized in that, It also includes an oil pump (21), a PTO intermediate shaft gear (2) connected to the oil pump (21), a hydraulic torque converter (3) located on one side of the PTO input gear (4), and an oil pump (21) located on the other side of the PTO input gear (4) and connected to the oil inlet bushing (329).

8. A hydraulic transmission as described in claim 6, characterized in that, The PTO output gear (1), PTO intermediate shaft gear (2), and PTO input gear (4) are arranged from top to bottom.

9. A hydraulic transmission as described in claim 6, characterized in that, The pump wheel (31) is connected to the oil inlet bushing (329) through the bearing B (326). The bearing B (326) is fitted with a bearing housing (328). The pump wheel (31) is fixedly connected to the bearing housing (328). The bearing housing (328) is provided with a spline. The PTO input gear (4) is connected to the bearing housing (328) by the spline.

10. A hydraulic transmission as described in claim 1, characterized in that, The forward clutch is located below the turbine shaft (5) and is connected to the turbine shaft (5) for transmission. The first gear transmission shaft (7) is coaxial with the forward clutch. The first gear clutch is located below the first gear transmission shaft (7). The second gear clutch and the reverse clutch are located below the forward clutch. The second gear clutch is located between the first gear clutch and the reverse clutch. The high-speed clutch is located below the reverse clutch. The third gear clutch is located below the second gear clutch. The output gear (16) is located below the first gear clutch. The output flange is located on the side of the output gear (16) away from the third gear clutch. The idler gear (17) is located below the high-speed clutch.

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