A two-range transfer case for a large off-road vehicle

Abstract

The utility model is suitable for vehicle transmission system technical field provides a kind of two large off-road vehicle stops and moves ware, including gearbox shell, the top of gearbox shell is provided with top cover, the upper end of gearbox shell is provided with input shaft, the lower of gearbox shell is provided with intermediate shaft in input shaft, the lower of gearbox shell is provided with output shaft in intermediate shaft, the intermediate shaft is provided with intermediate shaft high gear and intermediate shaft low gear;With pressure lubricating oil pump in input shaft rear end portion, and input shaft center oil way is bored through, so that the lubrication condition of the worst input shaft front and rear bearing is all forced lubrication by oil pump, lubrication is more reliable, improves gear bearing life;By being provided with gear shift mechanism, gear shift force is reduced while simplifying the structure of part, and manufacturing cost and manufacturing difficulty are reduced. Simultaneously, it is ensured that gear shift is portable and reliable.

Description

Technical Field

[0001] This utility model relates to vehicle transmission systems, and in particular to a two-speed transfer case for a large off-road vehicle. Background Technology

[0002] A transfer case is a gear transmission system. Its input shaft is directly or via a universal joint connected to the second shaft of the transmission, while it has several output shafts, each connected to a drive axle via a universal joint. In multi-axle drive vehicles, a transfer case is typically installed to distribute the power output from the transmission to each drive axle. The basic structure of a transfer case is also a gear transmission system; its input shaft is directly or via a universal joint connected to the second shaft of the transmission, while it has several output shafts, each connected to a drive axle via a universal joint.

[0003] Existing transfer cases often suffer from problems such as large size, heavy weight, insufficient lubrication, and inconvenient shifting. Especially for large off-road vehicles, when one drive wheel slips in complex off-road conditions, power cannot be effectively transmitted, and the vehicle is prone to getting into trouble. Utility Model Content

[0004] This utility model provides a two-speed transfer case for large off-road vehicles, aiming to solve the problems of existing transfer cases, such as large size, heavy weight, insufficient lubrication, and inconvenient shifting operation. Especially for large off-road vehicles, when one drive wheel slips in complex field conditions, power cannot be effectively transmitted, and the vehicle is prone to getting into trouble.

[0005] This utility model is implemented as follows: a two-speed transfer case for a large off-road vehicle includes a gearbox housing, a top cover at the top of the gearbox housing, an input shaft at the upper end of the gearbox housing, an intermediate shaft below the input shaft, and an output shaft below the intermediate shaft. The intermediate shaft has a high-gear and a low-gear, the input shaft has a high-gear and a low-gear, and the output shaft has an output gear. A high-low gear engagement sleeve is provided between the high-gear and low-gear on the input shaft. A built-in pressure lubricating oil pump is located at the rear end of the input shaft, and a central oil passage is drilled in the center of the input shaft. The outlet of the pressure lubricating oil pump is connected to the central oil passage.

[0006] Preferably, it also includes a shifting mechanism, which includes a shifting cylinder, the output end of which is fixedly connected to a shift fork shaft, a shift fork mounted on the shift fork shaft, and the bottom of the shift fork mounted on a high / low gear engagement sleeve.

[0007] The beneficial effect of adopting the above-mentioned further solution is to ensure the accuracy of power transmission.

[0008] Preferably, the shift cylinder has three air passage interfaces, which correspond to the three gears of the transfer case: neutral, high gear, and low gear.

[0009] The beneficial effect of adopting the above-mentioned further solution is that it reduces the ease of shifting while ensuring the reliability of shifting.

[0010] Preferably, the method further includes a front axle engagement mechanism, which includes a front axle engagement sleeve and a front axle shift fork for driving its movement. A front output shaft is mounted on one side of the output shaft in the gearbox housing. The front axle engagement sleeve is fitted onto the front output shaft, and the front axle shift fork is mounted on the front axle engagement sleeve. The front axle engagement sleeve is used to engage the front output shaft with the output shaft.

[0011] The beneficial effect of adopting the above-mentioned further solution is that when the rear wheels slip, the front axle engagement sleeve can engage the front output shaft and the output shaft, connect the second power output end of the transfer case, and output power through the front output shaft to ensure that the off-road vehicle can pass smoothly.

[0012] Preferably, the pressure lubricating oil pump includes an oil pump housing, an oil pump drive gear, an oil pump gear ring, and an oil pump cover.

[0013] The beneficial effects of adopting the above-mentioned further solutions are: improved lubrication conditions, and the ability to reduce the size of gears and bearings, thereby reducing the weight and volume of the entire device.

[0014] Preferably, the bearings supporting each shaft in the input shaft, intermediate shaft, and output shaft are tapered roller bearings.

[0015] The beneficial effects of adopting the above-mentioned further solutions are: the bearing adopts a full tapered bearing design, which reduces the wheelbase of the transmission and improves the meshing performance of the gears.

[0016] Preferably, the intermediate shaft high gear, intermediate shaft low gear, input shaft high gear, and input shaft low gear are all helical gears with large overlap and large helix angle.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: using helical high gears with large overlap and large helix angle, the structure is compact, the meshing is smooth, the noise is low, the transmission is smooth, and the weight of the transmission is reduced.

[0018] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model provides a two-speed transfer case for large off-road vehicles. By incorporating a pressure lubrication oil pump at the rear end of the input shaft and drilling through the central oil passage of the input shaft, the front and rear bearings of the input shaft, which experience the most severe lubrication conditions, are forcibly lubricated by the oil pump, resulting in more reliable lubrication and improved gear bearing life. Furthermore, the intermediate shaft high-speed gear, intermediate shaft low-speed gear, input shaft high-speed gear, and input shaft low-speed gear all utilize helical high-gear with high overlap and large helix angle, resulting in a compact structure, smooth meshing, low noise, and smooth transmission, while reducing the weight of the transmission. The included shifting mechanism reduces shifting force and simplifies the component structure, lowering manufacturing costs and difficulty. Simultaneously, it ensures easy and reliable shifting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 Figure 1 Schematic diagram of the installation structure of the input shaft and the built-in pressure lubricating oil pump.

[0021] In the diagram: 1. Gearbox housing; 2. Top cover; 3. Input shaft; 4. Intermediate shaft; 5. Output shaft; 6. Intermediate shaft high gear; 7. Intermediate shaft low gear; 8. Input shaft high gear; 9. Input shaft low gear; 10. Output gear; 11. Shift cylinder; 11a. Neutral interface; 11b. High gear interface; 11c. Low gear interface; 12. Shift fork shaft; 13. Shift fork; 14. Front axle shift fork; 15. Front output shaft; 16. Front axle engagement sleeve; 19. Oil pump housing; 20. Oil pump drive gear; 21. Oil pump gear ring; 22. Oil pump cover; 27. High / low gear engagement sleeve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Please see Figure 1-2This utility model provides a technical solution for a two-speed transfer case for a large off-road vehicle: a two-speed transfer case for a large off-road vehicle includes a gearbox housing 1, a top cover 2 at the top of the gearbox housing 1, an input shaft 3 at the upper end of the gearbox housing 1, an intermediate shaft 4 below the input shaft 3, an output shaft 5 below the intermediate shaft 4, a high gear 6 and a low gear 7 on the intermediate shaft 4, a high gear 8 and a low gear 9 on the input shaft 3, an output gear 10 on the output shaft 5, and a high / low gear engagement sleeve 27 between the high gear 8 and the low gear 9 on the input shaft 3;

[0024] The rear end of the input shaft 3 is equipped with a built-in pressure lubricating oil pump, and a central oil passage is drilled in the center of the input shaft 3. The outlet of the pressure lubricating oil pump is connected to the central oil passage.

[0025] Furthermore, it also includes a gear shifting mechanism, which includes a gear shifting cylinder 11, the output end of which is fixedly connected to a shift fork shaft 12, a shift fork 13 mounted on the shift fork shaft 12, and the bottom of the shift fork 13 mounted on a high / low gear engagement sleeve 27.

[0026] In this embodiment, a shifting mechanism is provided. To ensure the accuracy of power transmission, this mechanism is controlled by a shifting cylinder 11. When the transfer case is in neutral, the high / low gear engagement sleeve 27 is in the neutral position. Under the action of the shifting cylinder 11, the shift fork shaft 12 drives the shift fork 13, causing the high / low gear engagement sleeve 27 to move to the left and engage with the high gear 8 on the input shaft, completing the high gear shift. Similarly, under the action of the shifting cylinder 11, the shift fork shaft 12 drives the shift fork 13, causing the high / low gear engagement sleeve 27 to move to the right and engage with the low gear 9 on the input shaft, completing the high gear shift.

[0027] Typically, the shift cylinder 11 has three air passage interfaces, which correspond to the three gears of the transfer case: neutral 11a, high gear 11b, and low gear 11c.

[0028] In this embodiment, the shift cylinder 11 is provided with three air passage interfaces; the three gears of the transfer case, neutral, high gear and low gear, are controlled by three connectors, neutral interface 11a, high gear interface 11b and low gear 11c respectively. The shift cylinder 11 is used for shifting, which not only reduces the ease of shifting but also ensures the reliability of shifting.

[0029] Specifically, it also includes a front axle engagement mechanism, which includes a front axle engagement sleeve 16 and a front axle shift fork 14 that drives its movement. A front output shaft 15 is mounted on one side of the output shaft 5 in the gearbox housing 1. The front axle engagement sleeve 16 is fitted on the front output shaft 15, and the front axle shift fork 14 is mounted on the front axle engagement sleeve 16. The front axle engagement sleeve 16 is used to engage the front output shaft 15 with the output shaft 5.

[0030] In this embodiment, a front axle engagement mechanism is provided, which includes a front axle engagement sleeve 16 and a front axle shift fork 14 that drives its movement. When the rear wheel slips, the front axle engagement sleeve 16 can engage the front output shaft 15 and the output shaft 5, connecting the second power output end of the transfer case. Power is output through the front output shaft 15, ensuring that the off-road vehicle can pass smoothly.

[0031] In addition, the pressure lubricating oil pump includes an oil pump housing 19, an oil pump drive gear 20, an oil pump gear ring 21, and an oil pump cover 22.

[0032] In this embodiment, by providing a pressure lubricating oil pump, the gears and bearings can be forcibly lubricated, which can increase the service life of the gears and bearings by 2-3 times. Due to the use of the oil pump, the lubrication conditions are improved, and the size of the gears and bearings can be reduced, thereby reducing the weight and volume of the entire device.

[0033] In addition, the bearings supporting the input shaft 3, intermediate shaft 4 and output shaft 5 are tapered roller bearings.

[0034] In this embodiment, the bearings supporting the input shaft 3, intermediate shaft 4 and output shaft 5 are tapered roller bearings. The bearings adopt a full tapered bearing design, which reduces the wheelbase of the transmission and improves the meshing performance of the gears.

[0035] It should be noted that the intermediate shaft high gear 6, intermediate shaft low gear 7, input shaft high gear 8, and input shaft low gear 9 are all helical gears with large overlap and large helix angle.

[0036] In this embodiment, the intermediate shaft high gear 6, intermediate shaft low gear 7, input shaft high gear 8, and input shaft low gear 9 all adopt helical high gears with large overlap and large helix angle, resulting in a compact structure, smooth meshing, low noise, smooth transmission, and reduced transmission weight.

[0037] 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 and improvements 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 two-speed transfer case for a large off-road vehicle, characterized in that: The transmission includes a gearbox housing (1), a top cover (2) is provided at the top of the gearbox housing (1), an input shaft (3) is provided at the upper end of the gearbox housing (1), an intermediate shaft (4) is provided below the input shaft (3) of the gearbox housing (1), an output shaft (5) is provided below the intermediate shaft (4) of the gearbox housing (1), an intermediate shaft high gear (6) and an intermediate shaft low gear (7) are provided on the intermediate shaft (4), an input shaft high gear (8) and an input shaft low gear (9) are provided on the input shaft (3), an output gear (10) is provided on the output shaft (5), and a high-low gear engagement sleeve (27) is provided between the input shaft high gear (8) and the input shaft low gear (9) on the input shaft (3). The input shaft (3) is equipped with a built-in pressure lubricating oil pump at its rear end. A central oil passage is drilled in the center of the input shaft (3), and the outlet of the pressure lubricating oil pump is connected to the central oil passage.

2. The two-speed transfer case for a large off-road vehicle according to claim 1, characterized in that: It also includes a shifting mechanism, which includes a shifting cylinder (11), the output end of which is fixedly connected to a shift fork shaft (12), a shift fork (13) is mounted on the shift fork shaft (12), and the bottom of the shift fork (13) is mounted on a high and low gear engagement sleeve (27).

3. A two-speed transfer case for a large off-road vehicle according to claim 2, characterized in that: The shift cylinder (11) is provided with three air passage interfaces, which correspond to the three gears of the transfer case: neutral (11a), high gear (11b), and low gear (11c).

4. A two-speed transfer case for a large off-road vehicle according to claim 1, characterized in that: It also includes a front axle engagement mechanism, which includes a front axle engagement sleeve (16) and a front axle shift fork (14) that drives its movement. The gearbox housing (1) has a front output shaft (15) mounted on one side of the output shaft (5). The front axle engagement sleeve (16) is fitted on the front output shaft (15), and the front axle shift fork (14) is mounted on the front axle engagement sleeve (16). The front axle engagement sleeve (16) is used to engage the front output shaft (15) with the output shaft (5).

5. A two-speed transfer case for a large off-road vehicle according to claim 1, characterized in that: The pressure lubricating oil pump includes an oil pump housing (19), an oil pump drive gear (20), an oil pump gear ring (21), and an oil pump cover (22).

6. A two-speed transfer case for a large off-road vehicle according to claim 1, characterized in that: The bearings supporting the input shaft (3), intermediate shaft (4) and output shaft (5) are tapered roller bearings.

7. A two-range transfer case for a large utility vehicle as set forth in claim 1, characterized in that: The intermediate shaft high gear (6), intermediate shaft low gear (7), input shaft high gear (8), and input shaft low gear (9) are all helical gears with large overlap and large helix angle.

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