A compact transfer case

Abstract

This utility model discloses a compact transfer case. A drive shaft is horizontally installed inside the case, and its right end is rotatably connected to the case. A drive bevel gear is coaxially rotatably connected to the right side of the drive shaft, and a driven bevel gear meshes with the drive bevel gear. The driven bevel gear is connected to an output shaft extending to the outside of the case. A transmission gear sleeve is fitted in the middle of the drive shaft, and a power gear meshes with the outer wall of the transmission gear sleeve. A secondary transmission gear is coaxially rotatably connected to the left end of the drive shaft, and its left end is rotatably connected to the case. A gear hub sleeve meshes with the outer side of the secondary transmission gear, and a shift fork is installed on the outer side of the gear hub sleeve. The shift fork is connected to a shift fork adjustment device, which can drive the shift fork to slide left and right. A transmission engagement tooth is provided on the left end of the transmission gear sleeve, and the shift fork adjustment device can drive the gear hub sleeve to slide to the right so that the gear hub sleeve meshes with the transmission engagement tooth. This utility model makes the transfer case maintenance work easier by setting a secondary transmission gear at the end of the drive shaft.

Description

Technical Field

[0001] This utility model relates to the field of transfer case technology, specifically a compact transfer case. Background Technology

[0002] A transfer case is an important mechanical transmission device, mainly used to distribute power from the engine or transmission to different drive shafts or working mechanisms. It is widely used in automobiles, construction machinery, agricultural machinery, and other fields. Its core function is to switch and distribute power through internal gear meshing and shift fork mechanisms. During the operation of the transfer case, the shift fork changes the gear meshing state by moving the gear hub sleeve, thereby achieving the switching of different drive modes.

[0003] However, the existing transfer case design has certain problems with the fit between the shift fork and the geared hub sleeve. During long-term use, friction and impact between the shift fork and the geared hub sleeve can lead to accelerated wear of the hub sleeve, and even poor meshing, thus affecting the transfer case's transmission efficiency and reliability. Furthermore, when the geared hub sleeve is damaged, the existing transfer case structure makes replacement and repair difficult, often requiring the disassembly of numerous parts, increasing maintenance costs and time, and potentially significantly impacting the normal operation of the equipment. Therefore, optimizing the transfer case's structural design, improving the service life of the geared hub sleeve, and simplifying its replacement and repair process have become urgent technical problems to be solved. Utility Model Content

[0004] The purpose of this invention is to provide a compact transfer case to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a compact transfer case, comprising a case body, a drive shaft horizontally mounted inside the case body, the right end of the drive shaft being rotatably connected to the case body, a drive bevel gear being coaxially rotatably connected to the right side of the drive shaft, a driven bevel gear meshing with the drive bevel gear, an output shaft extending to the outside of the case body being connected to the driven bevel gear, a transmission gear sleeve being sleeved in the middle of the drive shaft, a power gear meshing with the outer wall of the transmission gear sleeve, a secondary transmission gear being coaxially rotatably connected to the left end of the drive shaft, the left end of the secondary transmission gear being rotatably connected to the case body, a gear hub sleeve meshing with the outer side of the secondary transmission gear, a shift fork being mounted on the outer side of the gear hub sleeve, a shift fork adjustment device being connected to the shift fork, the shift fork adjustment device being able to drive the shift fork to slide left and right, a transmission engagement tooth being provided on the left end of the transmission gear sleeve, the shift fork adjustment device being able to drive the gear hub sleeve to slide to the right through the shift fork so that the gear hub sleeve meshes with the transmission engagement tooth.

[0006] Furthermore, a shaft hole one is provided on the left side of the housing, and a shaft hole two is provided on the side of the housing. A bearing sleeve is provided in the shaft hole one, and a first bearing is installed in the bearing sleeve. The left end of the secondary transmission gear is connected to the inner ring of the first bearing. A retaining ring groove is provided on the inner side of the shaft hole one, and a retaining ring is installed in the retaining ring groove. The retaining ring fits against the left side of the bearing sleeve. A second bearing is installed in the shaft hole two, and the right end of the second drive shaft is connected to the inner ring of the second bearing. A bearing end cap that is fixedly connected to the housing is provided on the outer side of the shaft hole two.

[0007] Furthermore, both the first and second bearings are tapered roller bearings.

[0008] Furthermore, the shift fork adjustment device includes an adjustment rod that is slidably connected to the housing. An electromagnetic actuator is installed on the outside of the housing, and the output end of the electromagnetic actuator is connected to the adjustment rod.

[0009] Furthermore, a first sealing groove is provided on the outer wall of the bearing sleeve, and a first sealing element is installed in the first sealing groove. A second sealing groove is provided on the side of the bearing end that fits against the housing, and a second sealing element is installed in the second sealing groove.

[0010] Furthermore, a pin is integrally connected to the left end of the drive shaft, and a mating pin hole is opened on the right side of the auxiliary transmission gear to cooperate with the pin. The outer side of the pin is keyed to the mating pin hole.

[0011] Furthermore, a lifting pin hole is provided on the left side of the auxiliary transmission gear.

[0012] Compared with the prior art, the beneficial effects of this utility model are: By setting a secondary transmission gear that can be detached from the drive shaft at one end, and in conjunction with the shaft hole on the housing, it is convenient to inspect and replace components such as the gear hub sleeve, shift fork, and secondary transmission gear.

[0013] A good seal is formed by the bearing sleeve installed inside the shaft hole and the first seal. At the same time, the snap ring and the bearing sleeve can be easily installed and fixed, and are easy to disassemble and repair. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] In the diagram: 1. Housing; 2. Drive shaft; 3. Drive bevel gear; 4. Driven bevel gear; 5. Output shaft; 6. Transmission gear sleeve; 7. Power gear; 8. Secondary transmission gear; 9. Gear hub sleeve; 10. Shift fork; 11. Shift fork adjustment device; 101. Adjusting rod; 102. Electromagnetic actuator; 12. Transmission mating gear; 13. Shaft hole one; 14. Bearing sleeve; 15. First bearing; 16. Snap ring; 17. Shaft hole two; 18. Second bearing; 19. Bearing end cover; 20. First sealing groove; 21. Second sealing groove; 22. Pin; 23. Mating pin hole; 24. Lifting pin hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1 As shown, this embodiment provides a compact transfer case. The compact transfer case includes a housing 1. A drive shaft 2 is horizontally mounted inside the housing 1. The right end of the drive shaft 2 is rotatably connected to the housing 1. A drive bevel gear 3 is sleeved on the right side of the drive shaft 2. The inner side of the drive bevel gear 3 is keyed to the drive shaft 2 to form a coaxial rotation. A driven bevel gear 4 meshes with the drive bevel gear 3. An output shaft 5 extending to the outside of the housing 1 is connected to the driven shaft 2. A transmission gear sleeve 6 is sleeved in the middle of the drive shaft 2, forming a rotatable connection with the drive shaft 2. The outer wall of the transmission gear sleeve 6 has external teeth that mesh with a power gear 7. A secondary transmission gear 8 is coaxially rotatably connected to the left end of the drive shaft 2. The left end of the secondary transmission gear 8 is rotatably connected to the housing 1. A gear hub sleeve 9 meshes with the outer side of the secondary transmission gear 8. A shift fork 10 groove is formed on the outer side of the gear hub sleeve 9. The shift fork 10 is installed in the groove of the shift fork 10. The shift fork 10 is connected to the shift fork adjustment device 11. The shift fork adjustment device 11 can drive the shift fork 10 to slide left and right. The left end of the transmission gear sleeve 6 is provided with a transmission engagement tooth 12. The shift fork adjustment device 11 can drive the gear hub sleeve 9 to slide to the right through the shift fork 10. When the gear hub sleeve 9 slides to the right, the inner teeth of the gear hub sleeve 9 mesh with the transmission engagement tooth 12. By shifting the gear hub sleeve 9 through the shift fork 10, the transmission gear sleeve 6 is linked with the secondary transmission gear 8, thereby causing the power gear 7 to drive the drive shaft 2 to rotate, thereby causing the drive shaft 2 to drive the drive bevel gear 3 and the passive bevel gear 4 to transmit power to the output shaft 5.

[0018] In this embodiment, a shaft hole 13 is provided on the left side of the housing 1, and a shaft hole 17 is provided on the side of the housing 1. A bearing sleeve 14 is provided in the shaft hole 13, and the outer wall of the bearing sleeve 14 is clearance-fitted with the shaft hole 13. A first bearing 15 is installed in the bearing sleeve 14. The left end of the auxiliary transmission gear 8 passes through the inner ring of the first bearing 15. A snap ring groove is provided on the inner side of the shaft hole 13, and a snap ring 16 is installed in the snap ring groove. The snap ring 16 fits against the left side of the bearing sleeve 14, and the snap ring 16 prevents the bearing sleeve 14 from coming out. A second bearing 18 is installed in the shaft hole 17, and the right end of the drive shaft 2 passes through the inner ring of the second bearing 18. A bearing end cap 19, which is fixedly connected to the housing 1, is provided on the outer side of the shaft hole 17.

[0019] In this embodiment, the first bearing 15 and the second bearing 18 are tapered roller bearings.

[0020] In this embodiment, the shift fork adjustment device 11 includes an adjustment rod 101, which is slidably connected to the housing 1. An electromagnetic actuator 102 is installed on the outside of the housing 1. The output end of the electromagnetic actuator 102 is connected to the adjustment rod 101. The adjustment action of the shift fork 10 is completed by the electromagnetic actuator 102, which is faster and more accurate, and reduces the wear caused by the shifting teeth.

[0021] In this embodiment, a first sealing groove 20 is provided on the outer wall of the bearing sleeve 14, and a first sealing element is installed in the first sealing groove 20. A second sealing groove 21 is provided on the side of the bearing end that is in contact with the housing 1, and a second sealing element is installed in the second sealing groove 21. The first sealing element and the second sealing element can be rubber sealing rings, which are formed by compression to form a seal.

[0022] In this embodiment, a pin 22 is integrally connected to the left end of the drive shaft 2, and a mating pin hole 23 that mates with the pin 22 is opened on the right side of the auxiliary transmission gear 8. The outer side of the pin 22 is keyed to the mating pin hole 23. By setting the pin 22 at the left end of the drive shaft 2 and keying it to the auxiliary transmission gear 8, the mating pin hole 23 on the auxiliary transmission gear 8 further reduces the weight of the auxiliary transmission gear 8, making it convenient for later maintenance, replacement and disassembly operations.

[0023] In this embodiment, a lifting pin hole 24 is provided on the left side of the auxiliary transmission gear 8, which facilitates the removal of the auxiliary transmission gear 8. A handle can be welded to the left side wall of the bearing sleeve 14 to facilitate the removal of the bearing sleeve 14.

[0024] Through the above structural design, the compact transfer case of this utility model has the following advantages: When overhauling the transfer case, the retaining ring 16 can be removed with tools, and the bearing sleeve 14 and the first bearing 15 in the shaft hole 13 can be taken out and installed and replaced in the lifting pin hole 24 on the secondary transmission gear 8. After removing the secondary transmission gear 8, the gear hub sleeve 9 can be removed from the shift fork 10 and taken out from the shaft hole 13. Compared with the whole disassembly and repair, this method is more convenient for the maintenance of the power transmission structure such as the gear hub sleeve 9 and the secondary transmission gear 8. At the same time, the secondary transmission gear 8 can be replaced, which is more cost-effective than repairing the drive shaft 2.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A compact transfer case, comprising a housing (1), characterized in that: A drive shaft (2) is horizontally installed inside the housing (1). The right end of the drive shaft (2) is rotatably connected to the housing (1). A drive bevel gear (3) is coaxially rotatably connected to the right side of the drive shaft (2). A passive bevel gear (4) is meshed with the drive bevel gear (3). An output shaft (5) extending to the outside of the housing (1) is connected to the passive bevel gear (4). A transmission gear sleeve (6) is sleeved in the middle of the drive shaft (2). A power gear (7) meshes with the outer wall of the transmission gear sleeve (6). A secondary transmission gear (8) is coaxially rotatably connected to the left end of the drive shaft (2). The left end of the auxiliary transmission gear (8) is rotatably connected to the housing (1). The outer side of the auxiliary transmission gear (8) is meshed with a gear hub sleeve (9). A shift fork (10) is installed on the outer side of the gear hub sleeve (9). The shift fork (10) is connected to a shift fork adjustment device (11). The shift fork adjustment device (11) can drive the shift fork (10) to slide left and right. The left end of the transmission gear sleeve (6) is provided with a transmission engagement tooth (12). The shift fork adjustment device (11) can drive the gear hub sleeve (9) to slide to the right through the shift fork (10) so that the gear hub sleeve (9) meshes with the transmission engagement tooth (12).

2. A compact transfer case according to claim 1, characterized in that: The left side of the housing (1) is provided with a shaft hole 1 (13), and the side of the housing (1) is provided with a shaft hole 2 (17). A bearing sleeve (14) is provided in the shaft hole 1 (13), and a first bearing (15) is installed in the bearing sleeve (14). The left end of the auxiliary transmission gear (8) is connected to the inner ring of the first bearing (15). A retaining ring (16) groove is provided on the inner side of the shaft hole 1 (13), and a retaining ring (16) is installed in the retaining ring (16) groove. The retaining ring (16) fits against the left side of the bearing sleeve (14). A second bearing (18) is installed in the shaft hole 2 (17), and the right end of the drive shaft (2) is connected to the inner ring of the second bearing (18). A bearing end cap (19) is provided on the outer side of the shaft hole 2 (17) and is fixedly connected to the housing (1).

3. A compact transfer case according to claim 2, characterized in that: The first bearing (15) and the second bearing (18) are tapered roller bearings.

4. A compact transfer case according to claim 1, characterized in that: The shift fork adjustment device (11) includes an adjustment rod (101), which is slidably connected to the housing (1). An electromagnetic actuator (102) is installed on the outside of the housing (1), and the output end of the electromagnetic actuator (102) is connected to the adjustment rod (101).

5. A compact transfer case as in claim 2, wherein: The outer wall of the bearing sleeve (14) is provided with a first sealing groove (20), and a first sealing element is installed in the first sealing groove (20). A second sealing groove (21) is provided on the side of the bearing end that is in contact with the housing (1), and a second sealing element is installed in the second sealing groove (21).

6. A compact transfer case as in claim 1, wherein: The left end of the drive shaft (2) is integrally connected with a pin (22), and the right side of the auxiliary transmission gear (8) is provided with a mating pin hole (23) that mates with the pin (22). The outer side of the pin (22) is keyed to the mating pin hole (23).

7. A compact transfer case as in claim 1, wherein: The left side of the auxiliary transmission gear (8) is provided with a lifting pin hole (24).

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