Tractor double-wet clutch power reversing mechanism

Abstract

The utility model discloses a tractor double wet clutch power reversing mechanism, and belongs to the technical field of tractor gearboxes. The mechanism comprises an engine input shaft, a hollow shaft, a duplicate gear shaft, a reverse transmission gear, a forward transmission gear and a reversing gear. The engine input shaft and the hollow shaft are of a coaxial lap joint cantilever supporting structure, a first-stage gear and a second-stage gear are fixedly connected to the duplicate gear shaft, and the reversing gear is meshed with the forward transmission gear and the second-stage gear. Transmission of power to the reverse transmission gear or the forward transmission gear is controlled through the first wet clutch and the second wet clutch correspondingly, and the reversing function of forward gear, reverse gear and neutral gear is achieved. The utility model has the advantages of compact structure, few parts and high transmission efficiency, and is suitable for a power reversing system of a tractor gearbox.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tractor gearbox technical field, especially is involved a tractor double wet clutch power reversing mechanism. BACKGROUND

[0002] The wet clutch power reversing structure of the existing tractor gearbox usually adopts the support mode that the central shaft is fixed on the box body through bearings at both ends. Two transmission gears are arranged on the shaft, and only one transmission gear participates in and transmits power when the tractor advances or reverses. The traditional layout has the following inherent defects: 1) the number of required gears and bearings is large, resulting in complex structure and high cost; 2) the transmission chain is long, and the transmission efficiency is lost; 3) the axial space is large, which is not conducive to the compact design of the gearbox. SUMMARY

[0003] In view of the problems in the prior art, the utility model provides the following technical scheme:

[0004] A tractor double wet clutch power reversing mechanism, the double wet clutch includes a first wet clutch and a second wet clutch, which comprises:

[0005] An engine input shaft is supported on a gearbox housing at one end, and the first wet clutch and the second wet clutch are installed on the engine input shaft;

[0006] A hollow shaft is supported on the gearbox housing at one end and movably sleeved on the other end of the engine input shaft;

[0007] A double gear shaft is supported on the gearbox housing at both ends and parallel to the engine input shaft axis, and a first-stage gear and a second-stage gear are coaxially connected to the double gear shaft;

[0008] A reverse transmission gear is movably sleeved on the engine input shaft and engaged with the first-stage gear;

[0009] A forward transmission gear is coaxially connected to the hollow shaft;

[0010] A reversing gear is simultaneously engaged with the forward transmission gear and the second-stage gear;

[0011] The driving end of the first wet clutch is coaxially connected to the engine input shaft, and the driven end is coaxially connected to the reverse transmission gear; the driving end of the second wet clutch is coaxially connected to the engine input shaft, and the driven end is coaxially connected to the forward transmission gear.

[0012] Further, the wheel shaft axis of the reversing gear is parallel to the engine input shaft axis.

[0013] Further, the wheel shaft of the reversing gear is supported on the gearbox housing.

[0014] Further, the hollow shaft is coaxial with the engine input shaft.

[0015] Further, the hollow shaft is connected to the transmission.

[0016] Further, the hollow shaft is rotatably connected to the engine input shaft through a bearing assembly.

[0017] Further, the hollow shaft is rotatably connected to the engine input shaft through two bearings.

[0018] Further, one end of the engine input shaft is supported by two bearings relative to the transmission housing.

[0019] The utility model discloses a beneficial effect:

[0020] Compact structure: through the innovative double cantilever support design, the number of bearing, bearing seat and other support elements is greatly reduced, and the axial size of the mechanism is significantly reduced.

[0021] Fewer parts, lower cost: the entire reversing mechanism only needs 5 gears, compared with the prior art, the total number of parts is greatly reduced, and the manufacturing cost and assembly complexity are reduced.

[0022] High transmission efficiency: the forward gear is a direct gear, the power transmission path is the shortest, and the efficiency is the highest; the reverse gear only transmits through a first idler, and the energy loss is small.

[0023] High reliability: the simplified structure means that the potential failure points are reduced, and the wet clutch works stably, has good heat dissipation and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings forming part of the present utility model are used to provide further understanding of the present utility model, and the illustrative embodiments of the present utility model and the description thereof are used to explain the present utility model and do not constitute undue limitation on the present utility model, and other related drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a schematic diagram of the transmission structure of the present utility model.

[0026] Reference numerals in the drawings: 1 - engine input shaft, 2 - reverse transmission gear, 3 - first wet clutch, 4 - second wet clutch, 5 - forward transmission gear, 6 - reversing gear, 7 - second stage gear, 8 - first stage gear, 9 - double gear shaft, 10 - hollow shaft. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other in the case of no conflict.

[0028] The utility model will be explained in detail below with reference to the drawings and in combination with the embodiments.

[0029] As shown in the figure, the utility model discloses a tractor double wet clutch power reversing mechanism, the double wet clutch includes first wet clutch 3 and second wet clutch 4, comprising:

[0030] Engine input shaft 1, one end is supported on the gearbox housing, and first wet clutch 3 and second wet clutch 4 are installed on engine input shaft 1;

[0031] Hollow shaft 10, one end is supported on the gearbox housing, and the other end is movably sleeved on the other end of engine input shaft 1 and is rotatably connected through a bearing assembly;The hollow shaft 10 is connected and outputs power to the gearbox;

[0032] Double gear shaft 9, both ends are supported on the gearbox housing and parallel to the engine input shaft 1, and the first-stage gear 8 and the second-stage gear 7 are coaxially connected on the double gear shaft 9;

[0033] Reverse transmission gear 2, movably sleeved on engine input shaft 1 and meshing transmission connection with first-stage gear 8;

[0034] Forward transmission gear 5, coaxially connected on hollow shaft 10;

[0035] Reversing gear 6, meshing transmission connection with forward transmission gear 5 and second-stage gear 7 simultaneously;

[0036] The first wet clutch 3 is used for controlling the transmission of power to the reverse transmission gear 2, that is, the first wet clutch 3 is used for controlling the power transmission of the engine input shaft 1 and the reverse transmission gear 2, on-off;Specifically, the driving end of the first wet clutch 3 is coaxially connected with the engine input shaft 1, and the driven end is coaxially connected with the reverse transmission gear 2, when the first wet clutch 3 is in the locking state that the driving end and the driven end are in the position, the engine input shaft 1 and the reverse transmission gear 2 are driven through the first wet clutch 3;When the first wet clutch 3 is in the loosening state that the driving end and the driven end are off the position, the power transmission between the engine input shaft 1 and the reverse transmission gear 2 is also disconnected;

[0037] The second wet clutch 4 is used to control the transmission of power to the forward transmission gear 5, that is, the second wet clutch 4 is used to control the on-off of the power transmission between the engine input shaft 1 and the forward transmission gear 5. Specifically, the driving end of the second wet clutch 4 is coaxially fixed with the engine input shaft 1, and the driven end is coaxially fixed with the forward transmission gear 5. When the second wet clutch 4 is in the locked state of the driving end and the driven end being in position, the engine input shaft 1 and the forward transmission gear 5 are driven through the second wet clutch 4. When the second wet clutch 4 is in the unlocked state of the driving end and the driven end being out of position, the power transmission between the engine input shaft 1 and the forward transmission gear 5 is also disconnected.

[0038] Similarly, when the first wet clutch 3 and the second wet clutch 4 are both in the unlocked state (out of position), the power transmission is interrupted, that is, the neutral gear.

[0039] Further, the wheel shaft axis of the reversing gear 6 is parallel to the engine input shaft 1.

[0040] Further, the wheel shaft of the reversing gear 6 is supported on the gearbox housing.

[0041] Further, the hollow shaft 10 is coaxial with the engine input shaft 1.

[0042] The first wet clutch 3 and the second wet clutch 4 are integrated in the gearbox hydraulic system and are accurately controlled by an electro-hydraulic control unit.

[0043] Working principle:

[0044] Forward gear: the control system instructs the first wet clutch 3 to separate and the second wet clutch 4 to combine. The engine power is directly driven to the output of the forward transmission gear 5 and the hollow shaft 10 through the engine input shaft 1 and the second wet clutch 4. At this time, the power does not pass through the reverse path, and the reversing gear 6, the second gear 7, the first gear 8 and the reverse transmission gear 2 are idling.

[0045] Reverse gear: the control system instructs the second wet clutch 4 to separate and the first wet clutch 3 to combine. The engine power drives the reverse transmission gear 2 through the engine input shaft 1 and the first wet clutch 3. The power is sequentially transmitted from the reverse transmission gear 2 → the first gear 8 → the second gear 7 → the reversing gear 6 → the forward transmission gear 5, and finally reversely drives the hollow shaft 10 to output. The output direction is opposite to that of the forward gear because the transmission path passes through the reverse transmission gear 2, the double gear (the second gear and the first gear), the reversing gear 6 and the forward transmission gear 5 three times.

[0046] Neutral gear: when the first wet clutch 3 and the second wet clutch 4 are both separated, the power transmission is interrupted.

[0047] The engine input shaft 1 as the input end and the hollow shaft 10 as the output end are on the same axis, the engine input shaft 1 and the hollow shaft 10 adopt a cantilever support structure and are overlapped with each other, two driving gears of a clutch are connected and interacted through double gear (first stage gear, second stage gear) and a reversing gear, and the reversing is realized by two wet clutches.

[0048] Based on the above scheme, we improved the existing shuttle reversing gearbox, and made a physical prototype. The mechanism has been successfully assembled on multiple tractor chassis, and strict function and durability verification tests have been completed. The test results show that the shifting of the reversing mechanism is smooth and impact-free, the transmission efficiency is significantly improved, the compactness of the structure reaches the expected target, and the feasibility and superiority of the technical scheme are fully verified.

[0049] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A tractor double wet clutch power shift mechanism, said double wet clutch comprising a first wet clutch and a second wet clutch, characterized by, The application relates to a transmission device of a vehicle, which comprises the following parts: an engine input shaft (1) supported at one end on a transmission case, a first wet clutch and a second wet clutch installed on the engine input shaft (1); a hollow shaft (10) supported at one end on the transmission case and movably sleeved at the other end on the engine input shaft (1); a double gear shaft (9) supported at two ends on the transmission case and parallel to the engine input shaft (1), and coaxially fixed with a first-stage gear (8) and a second-stage gear (7); a reverse transmission gear (2) movably sleeved on the engine input shaft (1) and engaged with the first-stage gear (8); a forward transmission gear (5) coaxially fixed on the hollow shaft (10); a reversing gear (6) simultaneously engaged with the forward transmission gear (5) and the second-stage gear (7); the driving end of the first wet clutch (3) is coaxially fixed with the engine input shaft (1), and the driven end is coaxially fixed with the reverse transmission gear (2); the driving end of the second wet clutch (4) is coaxially fixed with the engine input shaft (1), and the driven end is coaxially fixed with the forward transmission gear (5). The wheel shaft of the reversing gear (6) is parallel to the engine input shaft (1). The wheel shaft of the reversing gear (6) is supported on the transmission case. The hollow shaft (10) is coaxial with the engine input shaft (1). The hollow shaft (10) is connected with the transmission case. The hollow shaft (10) is rotatably connected with the engine input shaft (1) through a bearing assembly. The hollow shaft (10) is rotatably connected with the engine input shaft (1) through two bearings. The engine input shaft (1) is supported through two bearings between one end and the transmission case.

2. A tractor double wet clutch power shift mechanism according to claim 1, characterised in that, ​ 3. A tractor double wet clutch power shift mechanism according to claim 1, wherein ​ 4. A tractor double wet clutch power shift mechanism according to claim 1, wherein ​ 5. A tractor double wet clutch power shift mechanism according to claim 1, wherein ​ 6. A tractor double wet clutch power shift mechanism according to claim 1, wherein ​ 7. A tractor double wet clutch power shift mechanism according to claim 1 wherein, ​ 8. A tractor double wet clutch power shift mechanism according to claim 1, wherein ​

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