Transfer case and tractor using same

Abstract

The utility model discloses a transfer case and a tractor using the same, and belongs to the technical field of agricultural machinery, a transmission shaft of a case body is provided with a fast gear transmission gear, a slow gear transmission gear and a transmission output gear, a rear axle connecting disc is provided with a rear driving shaft, and the rear driving shaft is provided with a rear driving gear and a front driving inner gear. The front axle connecting disc is provided with a front driving shaft, the front driving shaft is provided with a front driving gear, a driving shifting fork sliding rod is connected into the sleeve in a sliding mode, the driving shifting fork sliding rod is connected with a driving shifting fork block provided with a driving shifting fork, the driving switching handle is hinged to the driving shifting fork sliding rod, and the power connecting disc is provided with a power input shaft. The power input shaft is sleeved with a fast and slow gear inner gear, a fast gear input gear and a slow gear input gear, the gear shifting fork guide rod is connected with a gear shifting fork sliding block provided with a gear shifting fork in a sliding mode, and the fast and slow gear handle is hinged to the gear shifting fork sliding block. The transfer case solves the problem that when a vehicle runs, the vehicle runs in a neutral gear due to bumping and shaking of an existing transfer case.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery technology, and relates to a transfer case and a tractor using the transfer case. Background Technology

[0002] Existing agricultural tractors mainly consist of a diesel engine, clutch, gearbox, and transfer case. The transfer case is the device that distributes the engine's power. On flat roads, the transfer case can output power to the rear axle (rear wheels) for driving; on rough roads, it can simultaneously output power to both the front and rear axles (front and rear wheels) for climbing. A current type of transfer case for a modified transport vehicle (application number: 202321750758.8) primarily uses a fast / slow gear lever to shift the gears, allowing them to engage with either the fast or slow gear transmission gears respectively. This ensures that the agricultural modified transport vehicle can use the fast gear for four-wheel drive on roads with gentle slopes and the slow gear for four-wheel drive on steeper roads. However, regardless of whether driving at high or low speeds, occasional bumps and vibrations can cause the dual gears of the fast and slow gears to shift, resulting in the fast gear input gear separating from the fast gear transmission gear or the slow gear input gear separating from the slow gear transmission gear, thus causing the vehicle to be driven in neutral. This requires the driver to manually shift gears again, posing a driving safety hazard. Utility Model Content

[0003] This utility model provides a transfer case and a tractor using the transfer case to solve the problem that existing transfer cases cause the fast gear input gear to separate from the fast gear transmission gear or the slow gear input gear to separate from the slow gear transmission gear due to bumps and vibrations when the vehicle is in motion.

[0004] To solve the above problems, the technical solution adopted by this utility model transfer case is as follows: It includes a housing with a power connection plate, a rear axle connection plate, and a front axle connection plate. The housing also includes a drive shaft, a sleeve, a shift fork guide rod, a fast / slow gear lever, and a drive switching lever. The drive shaft, the sleeve, and the shift fork guide rod are located inside the housing. The drive shaft is equipped with a fast gear transmission gear, a slow gear transmission gear, and a transmission output gear. The rear axle connection plate has a rear drive shaft extending into the housing. The rear drive shaft has a rear drive gear and a front axle drive gear. A drive internal gear is included, the front drive internal gear being slidable on the rear drive shaft, the rear drive gear meshing with the transmission output gear. The front axle connecting plate has a front drive shaft extending into the housing, the front drive shaft having a front drive gear adapted to the front drive internal gear. A drive shift fork slide rod is slidably connected within the sleeve, the drive shift fork slide rod having a drive shift fork block, the drive shift fork block having a drive shift fork engaging with the front drive internal gear, and the drive switching handle hinged to the drive shift fork slide rod. By operating the drive switching handle, the drive shift fork can control the disengagement and engagement of the front drive internal gear and the front drive gear. The power connection plate is provided with a power input shaft extending into the housing. Both the power input shaft and the rear drive shaft are splined shafts. A fast / slow gear internal gear, a fast gear input gear, and a slow gear input gear are mounted on the power input shaft. The fast gear input gear meshes with the fast gear transmission gear and is connected to the power input shaft by a fast gear bearing. The slow gear input gear meshes with the slow gear transmission gear. A slow gear bearing is provided between the power input shaft and the gear. The fast and slow gear internal gear is slidably mounted on the power input shaft. The fast and slow gear internal gear includes a fast gear input internal gear ring and a slow gear input internal gear ring. The fast gear input internal gear ring is adapted to the fast gear input gear, and the slow gear input internal gear ring is adapted to the fast gear input gear. A gear shift fork slider is slidably connected to the gear shift fork guide rod. The gear shift fork slider is provided with a shift fork that engages with the fast and slow gear internal gear. The fast and slow gear handle is hinged to the gear shift fork slider.

[0005] A more specific technical solution in the above technical solution is that the housing is further provided with a hinge seat, the middle part of the drive switching handle is hinged to the hinge seat, and one end of the drive switching handle is hinged to the drive shift fork slide rod.

[0006] Furthermore: the drive fork slide bar is provided with multiple drive bar limiting grooves, the sleeve is provided with a slide bar limiting column, the slide bar limiting column is provided with a slide bar limiting spring and a slide bar limiting steel ball, and the slide bar limiting spring pushes the slide bar limiting steel ball into one of the drive bar limiting grooves.

[0007] Furthermore: the gear shift fork guide rod is provided with multiple slider limiting grooves, the gear shift fork slider is provided with a slider limiting tube column, the slider limiting tube column is provided with a slider limiting spring and a slider limiting steel ball, and the slider limiting spring pushes the slider limiting steel ball into one of the slider limiting grooves.

[0008] Furthermore: the power input shaft is connected to the housing via a first bearing, the transmission shaft is connected to the housing via a second bearing, the rear drive shaft is connected to the housing via a third bearing, and the front drive shaft is connected to the housing via a fourth bearing.

[0009] A tractor including the aforementioned transfer case.

[0010] Furthermore: the rear end of the crankshaft of the diesel engine of the tractor is fixedly connected to the pressure plate of the clutch via a flywheel, the driven plate of the clutch is connected to the input shaft of the gearbox, and the output shaft of the gearbox is connected to the power input shaft of the transfer case via a universal joint drive shaft.

[0011] Due to the adoption of the above technical solution, this utility model has the following beneficial effects compared with the prior art: By mounting a fast / slow gear internal gear, a fast gear input gear, and a slow gear input gear on the power input shaft, and providing fast gear bearings and slow gear bearings respectively between the fast gear input gear and the power input shaft, it is ensured that the fast gear input gear and the slow gear input gear will not be displaced on the power input shaft; the fast / slow gear internal gear is slidably mounted on the power input shaft, and the power input shaft can drive the fast / slow gear internal gear to rotate. When the fast gear internal gear is in fast gear input mode... When the internal gear ring is engaged with the fast input gear, it is in the high gear position; when the slow input internal gear ring is engaged with the slow input gear, it is in the low gear position. Since the fast and slow input gears do not shift on the power input shaft, the fast input gear will not separate from the fast transmission gear or the slow input gear will not separate from the slow transmission gear due to bumps and vibrations when the tractor is running. Furthermore, the fast and slow internal gears will not disengage from the fast or slow input gears, effectively solving driving safety hazards and providing greater stability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the transfer case structure of this utility model.

[0013] Figure 2 yes Figure 1 Enlarged sectional view of region A in the middle.

[0014] Figure 3 yes Figure 1 Enlarged sectional view of region B in the middle.

[0015] Figure 4This is a schematic diagram of the transfer case in the fast rear-drive state of this utility model.

[0016] Figure 5 This is a schematic diagram of the transfer case in slow four-wheel drive mode according to this utility model.

[0017] In the diagram: 1. Housing; 11. Hinge; 12. Sleeve; 121. Slide rod limiting column; 122. Slide rod limiting spring; 123. Slide rod limiting ball; 2. Power connection plate; 21. Power input shaft; 22. Fast / slow gear internal gear; 221. Fast gear input internal gear ring; 222. Slow gear input internal gear ring; 23. Fast gear input gear; 231. Fast gear bearing; 24. Slow gear input gear; 241. Slow gear bearing; 3. Drive shaft; 31. Fast gear drive gear; 32. Slow gear drive gear; 33. Drive output gear; 4. Rear 41. Axle connecting plate; 42. Rear drive shaft; 43. Rear drive gear; 5. Front drive internal gear; 6. Front axle connecting plate; 51. Front drive shaft; 52. Front drive gear; 6. Fast / slow gear lever; 61. Gear shift fork guide rod; 611. Slider limit groove; 62. Gear shift fork slider; 621. Slider limit tube; 622. Slider limit spring; 623. Slider limit ball; 63. Gear shift fork; 7. Drive switching lever; 71. Drive shift fork slide rod; 711. Drive rod limit groove; 72. Drive shift fork block; 73. Drive shift fork. Detailed Implementation

[0018] The transfer case of this utility model will be further described in detail below with reference to the accompanying drawings and examples:

[0019] like Figures 1 to 3The transfer case shown includes a housing 1 with a power connection plate 2, a rear axle connection plate 4, and a front axle connection plate 5. The housing 1 also includes a drive shaft 3, a sleeve 12, a shift fork guide rod 61, a fast / slow gear lever 6, and a drive switching lever 7. The drive shaft 3, sleeve 12, and shift fork guide rod 61 are located inside the housing 1. The drive shaft 3 is equipped with a fast gear transmission gear 31, a slow gear transmission gear 32, and a transmission output gear 33. The rear axle connection plate 4 has a rear drive shaft 41 extending into the housing 1. The rear drive shaft 41 has a rear drive gear 42 and a front drive internal gear 43. The drive internal gear 43 can slide on the rear drive shaft 41. The rear drive gear 42 meshes with the transmission output gear 33. The front axle connecting plate 5 is provided with a front drive shaft 51 extending into the housing 1. The front drive shaft 51 is provided with a front drive gear 52 that is adapted to the front drive internal gear 43. A drive shift fork slide rod 71 is slidably connected in the sleeve 12. A drive shift fork block 72 is provided on the drive shift fork slide rod 71. A drive shift fork 73 that engages with the front drive internal gear 43 is provided on the drive shift fork block 72. The drive switching handle 7 is hinged to the drive shift fork slide rod 71. By turning the drive switch... Handle 7 allows shift fork 73 to control the disengagement and engagement of front drive internal gear 43 and front drive gear 52; power connection plate 2 is provided with power input shaft 21 extending into housing 1. Both power input shaft 21 and rear drive shaft 41 are splined shafts. A fast / slow gear internal gear 22, a fast gear input gear 23, and a slow gear input gear 24 are mounted on power input shaft 21. The fast gear input gear 23 meshes with the fast gear transmission gear 31 and is connected to the power input shaft 21 by a fast gear bearing 231. The slow gear input gear 24 meshes with the slow gear transmission gear 32 and is connected to the power input shaft 21 by a bearing 231. A slow-gear bearing 241 is provided between the input shafts 21 and 22. The fast / slow gear internal gear 22 is slidably mounted on the power input shaft 21. The fast / slow gear internal gear 22 includes a fast-gear input internal gear ring 221 and a slow-gear input internal gear ring 222. The fast-gear input internal gear ring 221 is adapted to the fast-gear input gear 23, and the slow-gear input internal gear ring 222 is adapted to the fast-gear input gear 23. A gear shift fork slider 62 is slidably connected to the gear shift fork guide rod 61. The gear shift fork slider 62 is provided with a shift fork 63 that engages with the fast / slow gear internal gear 22. The fast / slow gear handle 6 is hinged to the gear shift fork slider 62. The housing 1 is also provided with a hinge seat 11. The middle part of the drive switching handle 7 is hinged to the hinge seat 11, and one end of the drive switching handle 7 is hinged to the drive shift fork slide rod 71.In this example, the fast gear input gear 23 is a double gear. The fast gear input internal gear ring 221 of the fast and slow gear internal gear 22 can be fitted onto the small gear of the fast gear input gear 23. The large gear of the fast gear input gear 23 meshes with the fast gear transmission gear 31. The large gear of the fast gear input gear 23 has 24 teeth, the small gear of the fast gear input gear 23 has 15 teeth, the slow gear input gear 24 has 15 teeth, the fast gear input internal gear ring 221 and the slow gear input internal gear ring 222 of the fast and slow gear internal gear 22 both have 15 teeth, the fast gear transmission gear 31 has 22 teeth, the slow gear transmission gear 32 has 30 teeth, the transmission output gear 33 has 15 teeth, the rear drive gear 42 has 43 teeth, the front drive internal gear 43 has 17 teeth, and the front drive gear 52 has 17 teeth. The number of teeth of each gear can be adjusted according to requirements, which will not be described in detail here. The drive shift fork slide rod 71 is provided with multiple drive rod limiting grooves 711, and the sleeve 12 is provided with a slide rod limiting column 121. The slide rod limiting column 121 contains a slide rod limiting spring 122 and a slide rod limiting steel ball 123. The slide rod limiting spring 122 presses the slide rod limiting steel ball 123 into one of the drive rod limiting grooves 711. The gear shift fork guide rod 61 is provided with multiple slider limiting grooves 611, and the gear shift fork slider 62 is provided with a slider limiting column 621. The slider limiting column 621 contains a slider limiting spring 622 and a slider limiting steel ball 623. The slider limiting spring 622 presses the slider limiting steel ball 623 into one of the slider limiting grooves 611. The power input shaft 21 is connected to the housing 1 via a first bearing, the drive shaft 3 is connected to the housing 1 via a second bearing, the rear drive shaft 41 is connected to the housing 1 via a third bearing, and the front drive shaft 51 is connected to the housing 1 via a fourth bearing.

[0020] A tractor includes a transfer case as described above. The rear end of the crankshaft of the tractor's diesel engine is fixedly connected to the pressure plate of the clutch via a flywheel. The driven plate of the clutch is drivenly connected to the input shaft of the gearbox. The output shaft of the gearbox is connected to the power input shaft 21 of the transfer case via a universal joint drive shaft 3.

[0021] When driving on a flat road, shifting the fast / slow gear lever 6 causes the fast gear input internal gear ring 221 of the slow gear input gear 24 to engage with the fast gear input gear 23. The power input shaft 21 rotates, causing the fast / slow gear internal gear 22 to drive the fast gear input gear 23. The fast gear input gear 23 then drives the fast gear transmission gear 31 to rotate. The transmission shaft 3, along with the rotational speed of the fast gear transmission gear 31, drives the transmission output gear 33 to rotate. (It should be noted that the slow gear transmission gear 32 also rotates with the transmission shaft 3 at this time, although the slow gear transmission gear 32 meshes with the slow gear transmission gear 33...) The input gear 24 is also rotating, but a slow gear bearing 241 is provided between the slow gear input gear 24 and the power input shaft 21. The inner ring of the slow gear bearing 241 is fixedly connected to the power input shaft 21, and the outer ring of the slow gear bearing 241 is fixedly connected to the slow gear input gear 24. Therefore, the slow gear input gear 24 is in an idle state and will not affect the power input shaft 21. The transmission output gear 33 drives the rear drive gear 42 to rotate and the front drive inner gear 43 to rotate. The rear drive shaft 41 drives the rear wheels of the tractor to rotate. At this time, it is fast rear-wheel drive. Figure 4 As shown.

[0022] When driving on a road with a large incline, move the drive shift lever 7 to engage the front drive internal gear 43 with the front drive gear 52. Then move the fast / slow gear lever 6 to engage the slow gear input internal gear ring 222 of the fast / slow gear internal gear 22 with the slow gear input gear 24. The power input shaft 21 rotates, causing the fast / slow gear internal gear 22 to drive the slow gear input gear 24. The slow gear input gear 24 drives the slow gear transmission gear 32 to rotate. The transmission shaft 3 rotates with the speed of the slow gear transmission gear 32, driving the transmission output gear 33 to rotate. (It should be noted that the fast gear transmission gear 31 also rotates with the transmission shaft 3 at this time, although the fast gear input gear 23 is engaged with the fast gear transmission gear 31.) It is also rotating, but a fast gear bearing 231 is provided between the fast gear input gear 23 and the power input shaft 21. The inner ring of the fast gear bearing 231 is fixedly connected to the power input shaft 21, and the outer ring of the fast gear bearing 231 is fixedly connected to the fast gear input gear 23. Therefore, the fast gear input gear 23 is in an idle state and will not affect the power input shaft 21. The transmission output gear 33 drives the rear drive gear 42 to rotate and the front drive internal gear 43 to rotate. The rear drive shaft 41 drives the rear wheels of the tractor to rotate, and the front drive internal gear 43 drives the front drive gear 52. The front drive gear 52 drives the front drive shaft 51 to drive the front wheels of the tractor to rotate. At this time, it is a slow four-wheel drive. Figure 5 As shown.

Claims

1. A transfer case, comprising a housing having a power connection plate, a rear axle connection plate, a front axle connection plate, a drive shaft, a sleeve, a shift fork guide rod, a fast / slow gear lever, and a drive switching lever; the drive shaft, the sleeve, and the shift fork guide rod are disposed inside the housing; the drive shaft is provided with a fast gear transmission gear, a slow gear transmission gear, and a transmission output gear; the rear axle connection plate has a rear drive shaft extending into the housing; the rear drive shaft has a rear drive gear and a front drive internal gear; the rear drive gear meshes with the transmission output gear. The front axle connecting plate is provided with a front drive shaft extending into the housing. The front drive shaft is provided with a front drive gear adapted to the front drive internal gear. A drive shift fork slide rod is slidably connected within the sleeve. A drive shift fork block is provided on the drive shift fork slide rod. A drive shift fork fork is provided on the drive shift fork block, which is fitted with a drive shift fork that engages with the front drive internal gear. The drive switching handle is hinged to the drive shift fork slide rod. The power connecting plate is provided with a power input shaft extending into the housing. Both the power input shaft and the rear drive shaft are splined shafts. The characteristic feature is that: The power input shaft is fitted with a fast / slow gear internal gear, a fast gear input gear, and a slow gear input gear. The fast gear input gear meshes with the fast gear transmission gear and is connected to the power input shaft with a fast gear bearing. The slow gear input gear meshes with the slow gear transmission gear and is connected to the power input shaft with a slow gear bearing. The fast / slow gear internal gear is slidably mounted on the power input shaft. The fast / slow gear internal gear includes a fast gear input internal gear ring and a slow gear input internal gear ring. The fast gear input internal gear ring is adapted to the fast gear input gear, and the slow gear input internal gear ring is adapted to the fast gear input gear. A gear shift fork slider is slidably connected to the gear shift fork guide rod. The gear shift fork slider is provided with a shift fork that meshes with the fast / slow gear internal gear. The fast / slow gear handle is hinged to the gear shift fork slider.

2. The transfer case according to claim 1, characterized in that: The housing is also provided with a hinge seat, the middle part of the drive switching handle is hinged to the hinge seat, and one end of the drive switching handle is hinged to the drive shift fork slide rod.

3. The transfer case according to claim 2, characterized in that: The drive fork slide bar is provided with multiple drive bar limiting grooves, the sleeve is provided with a slide bar limiting column, and the slide bar limiting column is provided with a slide bar limiting spring and a slide bar limiting steel ball. The slide bar limiting spring pushes the slide bar limiting steel ball into one of the drive bar limiting grooves.

4. The transfer case according to claim 3, characterized in that: The gear shift fork guide rod is provided with multiple slider limiting grooves, and the gear shift fork slider is provided with a slider limiting tube column. The slider limiting tube column is provided with a slider limiting spring and a slider limiting steel ball. The slider limiting spring pushes the slider limiting steel ball into one of the slider limiting grooves.

5. The transfer case according to claim 4, characterized in that: Both the power input shaft and the rear drive shaft are splined shafts.

6. The transfer case according to claim 5, characterized in that: The power input shaft is connected to the housing via a first bearing, the drive shaft is connected to the housing via a second bearing, the rear drive shaft is connected to the housing via a third bearing, and the front drive shaft is connected to the housing via a fourth bearing.

7. A tractor, characterized in that: Includes the transfer case as described in any one of claims 1 to 6.

8. The tractor according to claim 7, characterized in that: The rear end of the crankshaft of the diesel engine of the tractor is fixedly connected to the pressure plate of the clutch via a flywheel. The driven plate of the clutch is drivenly connected to the input shaft of the gearbox. The output shaft of the gearbox is connected to the power input shaft of the transfer case via a universal joint drive shaft.

Images