Tractor power reversing and power high-low gear transmission device

Abstract

The utility model discloses a power reversing and high-low gear transmission device of a tractor. The power reversing and high-low gear transmission device comprises a hydraulic oil way system, a transmission mechanism and a box body, the transmission mechanism is arranged in the box and comprises a reverse gear transmission mechanism, a low-speed gear transmission mechanism, a high-speed gear transmission mechanism and an output transmission mechanism. The high-speed gear comprises a first transmission shaft, a driving transmission gear, a first clutch and a first gear, wherein the first clutch enables the first gear to be detachably combined with the shaft. The low-speed gear comprises a second transmission shaft, a driven transmission gear, a second clutch and a second gear, and the second gear is meshed with the first gear. The reverse gear comprises a third transmission shaft, a middle transition shaft, a driven transmission gear, a third clutch and a third gear, and the middle transition gear is meshed with the first gear and the third gear to achieve reverse gear. The output transmission mechanism comprises a mounting shaft and two connecting shafts which are respectively connected with the first transmission shaft and the mounting shaft. The second transmission shaft and the third transmission shaft are arranged on the two sides of the first transmission shaft respectively, the middle transition shaft is arranged below, and the installation shaft is arranged at the bottommost position.

Description

Technical Field

[0001] This utility model is a tractor power reversing and power high and low gear transmission device. Background Technology

[0002] The main working principle of a power shift transmission is to use a friction clutch (mostly wet, multi-plate) as the load-bearing shifting mechanism to perform power shifting. During the shifting process, the clutch slip control continuously transmits power, ensuring that power is not interrupted during the change of transmission ratio, thereby reducing shifting time and improving shifting quality.

[0003] Existing power shift transmissions employ four wet clutches and a secondary gearbox with engagement sleeves, and utilize a hydraulic control system to achieve uninterrupted gear shifting. However, existing power shift transmissions have certain drawbacks, primarily their complex structure. For example, the four gears in a power shift require four wet clutches for control, resulting in complex manufacturing, high costs, and a relatively long axial dimension. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a tractor power reversing and power high and low gear transmission device.

[0005] A tractor power reversing and high / low gear transmission device includes a hydraulic circuit system, a transmission mechanism, and a housing. The transmission mechanism is installed inside the housing and includes a reverse transmission mechanism, a low-speed transmission mechanism, a high-speed transmission mechanism, and an output transmission mechanism.

[0006] The high-speed transmission mechanism includes a first transmission shaft, which is rotatably connected to the housing. A drive transmission gear, a first clutch, and a first gear are coaxially mounted on the first transmission shaft. The drive transmission gear is fixedly connected to the first transmission shaft. The first clutch includes a first part and a second part. The first part is fixedly connected to the first transmission shaft, and the second part is fixedly connected to the first gear. The first gear is rotatably connected to the first transmission shaft.

[0007] The low-speed transmission mechanism includes a second transmission shaft, which is rotatably connected to the housing. A driven transmission gear, a second clutch, and a second gear are coaxially mounted on the second transmission shaft. The driven transmission gear is fixedly connected to the second transmission shaft and meshes with the driving transmission gear. The second clutch includes a first part and a second part. The first part is fixedly connected to the second transmission shaft, and the second part is fixedly connected to the second gear. The second gear is rotatably connected to the second transmission shaft and meshes with the first gear.

[0008] The reverse gear transmission mechanism includes a third transmission shaft and an intermediate transition shaft. The third transmission shaft and the intermediate transition shaft are rotatably connected in the housing. The third transmission shaft is coaxially connected to a driven transmission gear, a third clutch, and a third gear. The driven transmission gear is fixedly connected to the third transmission shaft and meshes with the driving transmission gear. The third clutch includes a first part and a second part. The first part is fixedly connected to the third transmission shaft, and the second part is fixedly connected to the third gear. The intermediate transition shaft is coaxially connected to a transition gear, which meshes with the first gear and the third gear.

[0009] The output transmission mechanism includes a mounting shaft, an input shaft, and an output shaft. The mounting shaft is fixedly connected to the housing. The input shaft is rotatably connected to the first transmission shaft on the same axis. The output shaft is rotatably connected to the mounting shaft on the same axis. The input shaft is fixedly connected to the first gear. The output shaft and the input shaft are driven by a gear mechanism. The output shaft is used to transmit power to the wheels.

[0010] The second and third drive shafts are located on both sides of the first drive shaft, the intermediate transition shaft is located below the first and third drive shafts, and the mounting shaft is located below the first drive shaft.

[0011] The hydraulic circuit system includes a working circuit system and a lubrication circuit system. The working circuit system is used to control the disengagement or engagement of the first clutch, the second clutch, and the third clutch.

[0012] Furthermore, the driving gear is fixedly connected to the first drive shaft, the driven gear to the second drive shaft, and the driven gear to the third drive shaft via a spline structure.

[0013] Furthermore, the first drive shaft, the second drive shaft, and the third drive shaft are all rotatably connected to the housing via bearings.

[0014] Furthermore, rubber rings are provided between the second part of the first clutch and the first gear, between the second part of the second clutch and the second gear, and between the second part of the third clutch and the third gear.

[0015] Furthermore, multiple sealing rings are provided between the first part of the first clutch and the first drive shaft, between the first part of the second clutch and the second drive shaft, and between the first part of the third clutch and the third drive shaft.

[0016] Furthermore, a vibration damper is sleeved at the front end of the first drive shaft via a spline structure, and a sealing ring is provided between the vibration damper and the first drive shaft.

[0017] Furthermore, both ends of the second and third drive shafts are installed in end caps, which are installed in pre-set inner holes in the housing. Sealing rings are provided between the end caps and the inner wall of the inner hole, between the end caps and the second drive shaft, and between the end caps and the third drive shaft.

[0018] Furthermore, the end caps are fixedly connected to the housing by bolts.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0020] This transmission structure uses three wet clutches, combined with electro-hydraulic control, to simultaneously realize power reversal and power high and low gear shifting, without interrupting power during the shifting process.

[0021] In this transmission structure, all three clutches are interchangeable and are located before the main gearbox. The structure employs a spatial three-shaft design, which is compact and can effectively shorten the overall wheelbase.

[0022] In this transmission structure, the hydraulic oil circuits of the three clutches are respectively arranged in the gearbox body, the oil bearing seat, the reverse gear rear end cover, the low gear rear end cover, and the three shafts, and the oil circuit arrangement is smooth.

[0023] This power reversing and high / low gear shifting section is located at the front end of the main and auxiliary transmission sections of the tractor gearbox. Its scalable design can be applied to the front end of tractor gearboxes of other horsepower ranges to meet the power reversing and shifting needs of different gears.

[0024] With button controls, the driver can switch directions and power gears via buttons, making operation convenient, comfortable, simple and effortless. It can significantly improve the user's operating environment, increase comfort during work, and meet the market's demand for simplified operation. Attached Figure Description

[0025] Figure 1 This is an external schematic diagram of a tractor power reversing and high / low gear transmission device;

[0026] Figure 2 yes Figure 1 Sectional view at point AA;

[0027] Figure 3 yes Figure 1 Sectional view at point BB;

[0028] Figure 4 This is a diagram showing the positional relationships of the transmission mechanism inside the housing;

[0029] Figure 5 This is an external schematic diagram of a tractor's power reversing and high / low gear transmission device from another angle. Detailed Implementation

[0030] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0031] like Figure 1-5 As shown, the components are: 1. Shock absorber; 2. First drive shaft; 3. Sealing ring; 4. First sealing ring; 5. Oil-filled bearing housing; 6. Drive gear; 7. Second sealing ring; 8. Upper front cover; 9. First clutch; 10. Rubber ring; 11. First gear; 13. Input shaft; 14. Housing; 15. Output shaft; 18. Needle roller bearing; 19. Mounting shaft; 20. Set screw; 21. Plug; 22. Inspection window cover; 23. Third sealing ring; 24. Mounting shaft front end cover; 25. Driven gear; 26. Second clutch; 27. Fourth sealing ring; 8. Low gear. Front cover 28, second drive shaft 29, bushing 30, front cover of third drive shaft 31, third drive shaft 32, third clutch 33, fifth sealing ring 34, front cover of intermediate transition shaft 35, second gear 36, sixth sealing ring 37, rear cover of second drive shaft 38, screw plug 39, sealing ring 40, third gear 41, rear cover of third drive shaft 42, transition gear 43, intermediate transition shaft 44, second bearing 45, first bearing 46, third bearing 48, fourth bearing 49, first working oil passage 1 401, First lubrication oil passage 1402, Second working oil passage 501, Second lubrication oil passage 502, Return oil passage 503, Third working oil passage 201, Third lubrication oil passage 202, Fourth working oil passage 901, Fourth lubrication oil passage 902, First lubrication hole 1101, First forced lubrication oil passage 1403, Second forced lubrication oil passage 2401, Third forced lubrication oil passage 1901, Fourth forced lubrication oil passage 1501, Fifth working oil passage 2901, Fifth lubrication oil passage 2902, Sixth Working oil passage 3801, sixth lubricating oil passage 3802, seventh working oil passage 2601, seventh lubricating oil passage 2602, second lubrication hole 3601, first milling flat structure 4401, first support rib 1404, eighth working oil passage 3201, eighth lubricating oil passage 3202, ninth working oil passage 4201, ninth lubricating oil passage 4202, tenth working oil passage 3301, tenth lubricating oil passage 3302, third lubrication hole 4101, second support rib 1405, second milling flat structure 3501;

[0032] A tractor power reversing and power high / low gear transmission device, which mainly consists of the above-mentioned parts;

[0033] like Figure 1 The first drive shaft 2 passes through the drive gear 6, the first clutch 9, and the first gear 11 from left to right.

[0034] The outer circle of one end of the first gear 11 is coaxially mounted in the inner hole of the third bearing 48, and the third bearing 48 is coaxially mounted in the inner hole of the housing 14 and is used for axial positioning.

[0035] The outer circumference of the other end of the first gear 11 is provided with an external spline, which meshes with the inner hole of the friction plate of the first clutch 9 through the spline. A rubber ring 10 is provided on the external spline of the first gear 11.

[0036] The other end of the first drive shaft 2 is coaxially fitted with the fourth bearing 49, the oil bearing seat 5, the oil seal and the retaining ring for the oil seal limiting hole, and the vibration damper 1.

[0037] The outer circle of the first drive shaft 2 engages with the spline of the inner hole of the shock absorber 1, and the outer circle of the shock absorber 1 is fixedly mounted on the engine by bolts.

[0038] The outer circle of the first drive shaft 2 meshes with the spline of the inner hole of the drive gear 6.

[0039] The oil-lubricated bearing seat 5 is fixed to the housing 14 by bolts.

[0040] Three second sealing rings 7 are provided between the inner hole of one end of the first clutch 9 and the outer circle of the first drive shaft 2, and the inner hole of one end of the first clutch 9 engages with the spline of the outer circle of the first drive shaft 2.

[0041] The inner hole of the oil-lubricated bearing seat 5 is coaxially fitted with three sealing rings 3 on the outer circle of the first drive shaft 2.

[0042] The outer circle of the oil-bearing seat 5 and the inner hole of the housing 14 are fitted with a first sealing ring 4 for sealing the hydraulic oil in the working oil passage and the lubrication oil passage.

[0043] The inner hole at one end of the first gear 11 meshes with the outer spline at one end of the input shaft 13.

[0044] Specifically, the housing 14 has a first working oil passage 1401 and a first lubricating oil passage 1402; the oil bearing seat 5 has a second working oil passage 501, a second lubricating oil passage 502, and a return oil passage 503; the first drive shaft 2 has a third working oil passage 201 and a third lubricating oil passage 202; both the working and lubricating oil passages of the first drive shaft 2 are sealed with screw plugs (21); and the first clutch 9 has a fourth working oil passage 901 and a fourth lubricating oil passage 902. The working oil passages and lubricating oil passages of the housing 14, the oil bearing seat 5, the first drive shaft 2, and the first clutch 9 are interconnected.

[0045] The first gear 11 has several first lubrication holes 1101 at one end of the spline, which are used to provide sufficient lubrication channels for the friction plates inside the clutch.

[0046] like Figure 2The outer circle of one end of the mounting shaft 19 is coaxially mounted in the hole at one end of the output shaft 15, and a needle roller bearing 18 is installed on the outer circle of the mounting shaft 19 and the inner hole of the output shaft 15.

[0047] The other end of the mounting shaft 19 is coaxially installed in one end hole of the mounting shaft front cover 24 and fixed to the mounting shaft front cover 24 by set screws 20. The mounting shaft front cover 24 is coaxially fixed to the corresponding hole of the housing 14 by bolts.

[0048] The outer circle of the front end cover 24 of the mounting shaft and the inner hole of the housing 14 are equipped with a third sealing ring 23.

[0049] Specifically, the housing 14 has two interconnected first forced lubrication channels 1403, the front end cover 24 of the mounting shaft has a second forced lubrication channel 2401, and the mounting shaft 19, the output shaft 15, and the auxiliary transmission shaft have a third forced lubrication channel 1901 and a fourth forced lubrication channel 1501, respectively, for lubrication of the needle roller bearings on the output shaft 15 and the auxiliary transmission shaft.

[0050] like Figure 3 One end of the second drive shaft 29 passes through the driven drive gear 25, the second clutch 26, the second gear 36, and the second bearing 45 from left to right.

[0051] The other end of the second drive shaft 29 is coaxially mounted with a bushing 30 and a first bearing 46. The low-end front cover 28 is fixed to the housing 14 by bolts for axial positioning.

[0052] The rear end is axially limited by the second bearing 45. A set of bearings is provided between the second gear 36 and the second transmission shaft 29.

[0053] A fourth sealing ring 27 is arranged between the outer circle of one end of the low-gear front cover 28 and the inner hole of the gearbox body.

[0054] The rear end cover 38 of the second drive shaft is coaxially installed in the gearbox body bore where the second drive shaft 29 is located.

[0055] A sixth sealing ring 37 is installed between the outer circle of one end of the rear end cover 38 of the second drive shaft and the inner hole of the gearbox body.

[0056] Two sealing rings 40 are installed between the inner hole of the rear end cover 38 of the second drive shaft and one end of the second drive shaft 29.

[0057] Three second sealing rings 7 are provided between the inner hole of one end of the second clutch 26 and the outer circle of the second drive shaft 29.

[0058] The inner hole at the other end of the second clutch 26 engages with the outer spline of the second drive shaft 29.

[0059] Specifically, the second drive shaft 29 has a fifth working oil passage 2901 and two fifth lubrication oil passages 2902, which are sealed with plugs 39. The rear end cover 38 of the second drive shaft has a sixth working oil passage 3801 and a sixth lubrication oil passage 3802. The second clutch 26 also has a seventh working oil passage 2601 and a seventh lubrication oil passage 2602. The second gear 36 has several radial second lubrication holes 3601 on its external spline at one end, providing sufficient lubrication channels for the internal friction plates of the clutch. The working oil passages and lubrication oil passages of the second drive shaft 29, the rear end cover 38, and the second clutch 26 are interconnected. Figure 4 The housing 14 has two first support ribs 1404 on the side where the second clutch 26 is installed, which can provide support when assembling the second clutch 26.

[0060] like Figure 3 One end of the third drive shaft 32 passes sequentially from left to right through the driven drive gear 25, the third clutch 33, the third gear 41, and the second bearing 45.

[0061] The other end of the third drive shaft 32 is fitted with a bushing 30 and a first bearing 46 in sequence. The front end cover 31 of the third drive shaft is fixed to the housing 14 by bolts for axial positioning.

[0062] The rear end is axially limited by the second bearing 45. A set of bearings is provided between the third gear 41 and the third transmission shaft 32.

[0063] One end of the third gear 41 is provided with an external spline, which meshes with the inner hole of the friction plate of the third clutch 33 through the spline.

[0064] A rubber ring 10 is provided on the external spline of the third gear 41.

[0065] Three second sealing rings 7 are provided between the inner hole of one end of the third clutch 33 and the outer circle of the third transmission shaft 32.

[0066] The inner hole at the other end of the third clutch 33 engages with the outer spline of the third drive shaft 32.

[0067] The outer circle of the third transmission shaft 32 meshes with the spline of the inner hole of the driven transmission gear 25.

[0068] A fourth sealing ring 27 is arranged between the outer circle of one end of the front cover 31 of the third drive shaft and the inner hole of the gearbox body.

[0069] The rear end cover 42 of the third drive shaft is coaxially installed in the internal bore of the gearbox body where the third drive shaft 32 is located.

[0070] A sixth sealing ring 37 is installed between the outer circle of one end of the rear end cover 42 of the third drive shaft and the inner hole of the gearbox body.

[0071] Two sealing rings 40 are installed between the inner hole of the rear end cover 42 of the third drive shaft and one end of the third drive shaft 32.

[0072] Specifically, the third drive shaft 32 is provided with an eighth working oil passage 3201 and two eighth lubrication oil passages 3202, and the working oil passages are sealed and plugged with screw plugs 39.

[0073] The rear end cover 42 of the third drive shaft has a ninth working oil passage 4201 and a ninth lubrication oil passage 4202. The third clutch 33 also has a tenth working oil passage 3301 and a tenth lubrication oil passage 3302.

[0074] The third gear 41 has several radial third lubrication holes 4101 on its external spline.

[0075] The working oil passages and lubrication oil passages of the third drive shaft 32, the rear end cover 42 of the third drive shaft, and the third clutch 33 are interconnected.

[0076] like Figure 4 The housing 14 has two second support ribs 1405 on the side where the third clutch 33 is installed, which can provide support when the third clutch 33 is assembled.

[0077] like Figure 2 The intermediate transition shaft 44 passes through the inner hole of the transition gear 43 from left to right.

[0078] Both ends are supported on the gearbox body wall.

[0079] A set of bearings is installed between the intermediate transition shaft 44 and the transition gear 43.

[0080] Retaining rings are used for mounting holes between bearings.

[0081] The front cover 35 of the intermediate transition shaft is fixed to the housing 14 by bolts.

[0082] Specifically, one end of the intermediate transition shaft 44 is provided with a first milling flattening structure 4401, and the inner hole of the front end cover 35 of the intermediate transition shaft is provided with a second milling flattening structure 3501 to prevent the intermediate transition shaft 44 from axial movement and circumferential rotation.

[0083] During power reversal and power high / low gear ranges, the driving transmission gear 6 meshes with two driven transmission gears 25.

[0084] The second gear 36 meshes with the first gear 11.

[0085] The third gear 41 meshes with the transition gear 43.

[0086] The transition gear 43 meshes with the first gear 11.

[0087] Working principle: When the high power gear is needed, the driver presses the high power gear control button on the control panel in the cab. The solenoid valve provides hydraulic oil with a certain pressure. The hydraulic oil with a certain pressure passes through the oil passage of housing 14, oil passage of bearing seat 5, oil passage of first drive shaft 2, and oil passage of first clutch 9, and then pushes the piston to press the friction plate, so that the internal spline of the friction plate engages with the external spline of the first gear 11, thereby engaging the first clutch 9.

[0088] Power from the engine is transmitted to the input shaft 13 via the shock absorber 1, the first drive shaft 2, the first clutch 9, and the first gear 11. It is then transmitted to the output shaft 15 via a gear pair of the main transmission, and finally to the rear wheels of the tractor via the auxiliary transmission, the crawler gear, and other transmission devices.

[0089] When the low-power gear is needed, the driver presses the low-power gear control button on the control panel in the cab. At this time, the high-power clutch immediately cuts off the pressurized oil, and the friction plates of the high-power clutch disengage under the pressure relief of the oil. Then, the electronically controlled solenoid valve supplies hydraulic oil with a certain pressure. The hydraulic oil with a certain pressure passes through the oil passage 38 of the rear end cover of the second drive shaft, the oil passage 29 of the second drive shaft, and the oil passage of the second clutch 26, and pushes the piston to press the friction plates, so that the internal spline of the friction plates engages with the external spline of the second gear 36, thereby engaging the second clutch 26.

[0090] Power from the engine is transmitted to the input shaft 13 via the shock absorber 1, the first drive shaft 2, the driving gear 6, the driven gear 25, the second drive shaft 29, the second clutch 26, the second gear 36, and the first gear 11. Then, it is transmitted to the output shaft 15 through a gear pair of the main transmission, and then to the rear wheels of the tractor through the auxiliary transmission, the creep gear, and other transmission devices.

[0091] When power reversing is required, the driver presses the power reversing control button on the control panel in the cab. At this time, the low-gear clutch immediately cuts off the pressurized oil, and the friction plates of the low-gear clutch disengage under the pressure relief. Then, the electronically controlled solenoid valve supplies hydraulic oil with a certain pressure. This pressurized hydraulic oil passes through the oil passages of the third drive shaft rear end cover 42, the third drive shaft 32, and the third clutch 33, pushing the piston to press against the friction plates. This causes the internal splines of the friction plates to engage with the external splines of the third gear 41, thereby engaging the third clutch 33. Power from the engine is transmitted to the input shaft 13 via the shock absorber 1, the first drive shaft 2, the driving gear 6, the driven gear 25, the third drive shaft 32, the third clutch 33, the third gear 41, the transition gear 43, and the first gear 11.

[0092] Then, it is transmitted to the output shaft 15 through a certain gear pair of the main transmission, and then to the rear wheels of the tractor through the secondary transmission, the crawler gear, and other transmission devices.

[0093] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tractor power reversing and high / low gear transmission device, characterized in that, The hydraulic circuit system, transmission mechanism, and housing are provided. The transmission mechanism is installed inside the housing and includes a reverse gear transmission mechanism, a low-speed gear transmission mechanism, a high-speed gear transmission mechanism, and an output transmission mechanism. The high-speed transmission mechanism includes a first transmission shaft, which is rotatably connected to the housing. A drive transmission gear, a first clutch, and a first gear are coaxially mounted on the first transmission shaft. The drive transmission gear is fixedly connected to the first transmission shaft. The first clutch includes a first part and a second part. The first part is fixedly connected to the first transmission shaft, and the second part is fixedly connected to the first gear. The first gear is rotatably connected to the first transmission shaft. The low-speed transmission mechanism includes a second transmission shaft, which is rotatably connected to the housing. A driven transmission gear, a second clutch, and a second gear are coaxially mounted on the second transmission shaft. The driven transmission gear is fixedly connected to the second transmission shaft and meshes with the driving transmission gear. The second clutch includes a first part and a second part. The first part is fixedly connected to the second transmission shaft, and the second part is fixedly connected to the second gear. The second gear is rotatably connected to the second transmission shaft and meshes with the first gear. The reverse gear transmission mechanism includes a third transmission shaft and an intermediate transition shaft. The third transmission shaft and the intermediate transition shaft are rotatably connected in the housing. The third transmission shaft is coaxially connected to a driven transmission gear, a third clutch, and a third gear. The driven transmission gear is fixedly connected to the third transmission shaft and meshes with the driving transmission gear. The third clutch includes a first part and a second part. The first part is fixedly connected to the third transmission shaft, and the second part is fixedly connected to the third gear. The intermediate transition shaft is coaxially connected to a transition gear, which meshes with the first gear and the third gear. The output transmission mechanism includes a mounting shaft, an input shaft, and an output shaft. The mounting shaft is fixedly connected to the housing. The input shaft is rotatably connected to the first transmission shaft on the same axis. The output shaft is rotatably connected to the mounting shaft on the same axis. The input shaft is fixedly connected to the first gear. The output shaft and the input shaft are driven by a gear mechanism. The output shaft is used to transmit power to the wheels. The second and third drive shafts are located on both sides of the first drive shaft, the intermediate transition shaft is located below the first and third drive shafts, and the mounting shaft is located below the first drive shaft. The hydraulic circuit system includes a working circuit system and a lubrication circuit system. The working circuit system is used to control the disengagement or engagement of the first clutch, the second clutch, and the third clutch.

2. The tractor power reversing and high / low gear transmission device according to claim 1, characterized in that, The driving gear is fixedly connected to the first drive shaft, the driven gear to the second drive shaft, and the driven gear to the third drive shaft via a spline structure.

3. The tractor power reversing and high / low gear transmission device according to claim 1, characterized in that, The first drive shaft, second drive shaft, and third drive shaft are all rotatably connected to the housing via bearings.

4. The tractor power reversing and high / low gear transmission device according to claim 1, characterized in that, Rubber rings are provided between the second part of the first clutch and the first gear, between the second part of the second clutch and the second gear, and between the second part of the third clutch and the third gear.

5. A tractor power reversing and high / low gear transmission device according to claim 1, characterized in that, Multiple sealing rings are provided between the first part of the first clutch and the first drive shaft, between the first part of the second clutch and the second drive shaft, and between the first part of the third clutch and the third drive shaft.

6. A tractor power reversing and high / low gear transmission device according to claim 1, characterized in that, A vibration damper is sleeved at the front end of the first drive shaft via a spline structure, and a sealing ring is provided between the vibration damper and the first drive shaft.

7. A tractor power reversing and high / low gear transmission device according to claim 1, characterized in that, Both ends of the second and third drive shafts are installed in end caps. The end caps are installed in the inner holes of the housing. Sealing rings are provided between the end caps and the inner wall of the inner hole, between the end caps and the second drive shaft, and between the end caps and the third drive shaft.

8. A tractor power reversing and high / low gear transmission device according to claim 7, characterized in that, The end caps are fixedly connected to the housing with bolts.

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