Mountainous area logging truck and transfer case thereof

Abstract

The utility model discloses a kind of mountain area wood cutting transport vehicles and its transfer case, including box body component and input component, intermediate component, output component and shift fork component, wherein, input component, including input shaft, input gear is fixedly arranged on input shaft;Intermediate component, including intermediate shaft and intermediate shaft gear, first gear and second gear, first gear and input gear meshing transmission;Output component, front output shaft and rear output shaft are connected by gear-and-clutch transmission, third gear and fourth gear are all empty sleeve on front output shaft, gear sleeve is installed on front output shaft, third gear and intermediate shaft gear meshing transmission, fourth gear and second gear meshing transmission;Shift fork component, for driving gear sleeve axial sliding to make gear sleeve and third gear or fourth gear engagement.In the scheme, not only high power gear shifting of transfer case can be realized in transfer case, but also stable switching of front and rear axle can be realized by setting gear-and-clutch and by external oil supply.

Description

Technical Field

[0001] This utility model belongs to the field of transfer case technology, and in particular relates to a logging transport vehicle for mountainous areas and its transfer case. Background Technology

[0002] Vehicles operating in mountainous areas typically face complex road conditions, requiring a certain level of off-road capability. Transfer cases offer more flexible power options to adapt to different road conditions. Common transfer case disengagement mechanisms include manual shift forks, hydraulic shift forks, and electronically controlled multi-plate clutches. Mechanical shift forks, driven manually or hydraulically, push gear sleeves to disengage or engage the front and rear drive axles, achieving the transfer case disengagement function. This type of structure has low efficiency, a low success rate in switching between front and rear drive axles, and is prone to component damage, requiring a high level of driver skill. Electronically controlled multi-plate clutches, on the other hand, use sensor signals to determine whether to disengage the clutch friction plates to cut off power. This type of structure generally has lower load-bearing capacity, requires frequent friction plate replacements, and has high maintenance costs. Furthermore, existing transfer cases typically lack high / low gear shifting functionality, making it impossible to switch between high and low speeds while driving. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a logging transport vehicle for mountainous areas and its transfer case. By setting a gear sleeve and shift fork components in the transfer case, the high and low power shifting of the transfer case is realized. By setting a dog clutch and controlling the engagement and disengagement of the front output shaft and the rear output shaft through external oil supply, the stable switching of the front and rear axles is realized.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A transfer case for a logging transport vehicle in mountainous areas includes a case body component and an input component, an intermediate component, an output component, and a shift fork component disposed within the case body component. The input component includes an input shaft, on which an input gear is fixedly mounted; The intermediate component includes an intermediate shaft and an intermediate shaft gear, a first gear, and a second gear arranged sequentially from front to back on the intermediate shaft. The first gear meshes with the input gear for transmission. The output components include a front output shaft, a third gear, a gear sleeve, a fourth gear, a jaw clutch, and a rear output shaft. The front output shaft and the rear output shaft are connected by a jaw clutch. The third gear and the fourth gear are loosely fitted on the front output shaft. The gear sleeve is mounted on the front output shaft in a manner that allows axial movement but not circumferential rotation. The gear sleeve is located between the third gear and the fourth gear. The third gear meshes with the intermediate shaft gear for transmission, and the fourth gear meshes with the second gear for transmission. The shift fork assembly is used to drive the gear sleeve to slide axially so that the gear sleeve engages with the third or fourth gear.

[0005] Preferably, the jaw clutch includes a spring baffle, a spring, a first piston, and a spring seat. The spring baffle is fixedly mounted on the front output shaft, and the spring seat is mounted on the front output shaft in a manner that allows axial movement but not circumferential rotation. The spring seat is connected to the rear output shaft via a jaw clutch. The spring is disposed between the spring baffle and the spring seat. The first piston is connected to the spring seat and can drive the spring seat to move axially to engage or disengage with the rear output shaft.

[0006] Preferably, the shift fork assembly includes a hydraulic cylinder, a second piston, a shift fork shaft, a shift fork shaft sleeve, a shift fork pull rod, and a shift fork. The hydraulic cylinder is mounted on the housing assembly, and a first oil port and a second oil port are provided on the side wall of the hydraulic cylinder. An installation space for mounting the shift fork shaft is provided between the hydraulic cylinder and the housing assembly. One side of the shift fork shaft sleeve is connected to the hydraulic cylinder, and the other side of the shift fork shaft sleeve is connected to the housing assembly. A second piston is fixedly arranged on the shift fork shaft. One end of the shift fork shaft is mounted on the hydraulic cylinder in an axially movable manner, and the other end of the shift fork shaft passes through the shift fork shaft sleeve, extends out of the installation space, and is fixedly connected to the upper end of the shift fork pull rod. The second piston is located inside the hydraulic cylinder and between the first oil port and the second oil port. The lower end of the shift fork pull rod is fixedly connected to the shift fork, and the shift fork is connected to the gear sleeve and can drive the gear sleeve to slide axially.

[0007] Preferably, the housing component includes a front housing, a rear housing, a front output end cover, and a rear output end cover. The front housing and the rear housing are fixedly connected. The front output end cover is installed on the front housing, and the rear output end cover is installed on the rear housing. The two ends of the front output shaft are supported on the front housing by the sixth bearing and the seventh bearing, respectively, and the two ends of the rear output shaft are supported on the rear output end cover by the eighth bearing and the ninth bearing, respectively.

[0008] Preferably, the first piston of the jaw clutch is axially movable and mounted on the rear output end cover. An oil filling space is provided between the first piston and the rear output end cover, and the rear output end cover is provided with a third oil port for injecting oil into the oil filling space.

[0009] Preferably, the front end of the front output shaft is provided with a front output flange via a spline, and the rear end of the rear output shaft is provided with a rear output flange via a spline.

[0010] Preferably, the input gear is integrally formed with the input shaft, the intermediate shaft gear is integrally formed with the intermediate shaft, and the first gear and the second gear are respectively heat-fitted onto the intermediate shaft.

[0011] Preferably, the front end of the input shaft is supported on the housing component by the first and second bearings, and the rear end of the input shaft is supported on the housing component by the third bearing; the two ends of the intermediate shaft are supported on the housing component by the fourth and fifth bearings, respectively.

[0012] Preferably, the system also includes an oil injection pipe assembly, which is mounted on the housing assembly.

[0013] A logging transport vehicle for mountainous areas includes a transfer case as described above.

[0014] This utility model, by adopting the above technical solution, has the following beneficial effects: 1. By setting the disengagement structure as a jaw clutch, the structure is simple. The engagement and disengagement of the jaw clutch are controlled by the first piston pushed by the external oil supply, thereby realizing the switching between two-wheel drive and four-wheel drive. The success rate of switching between the front and rear drive axles can reach 100%. The parts are not easily damaged, the load-bearing capacity is extremely strong, the reliability is higher, and there is no relative movement after engagement, resulting in high power transmission efficiency. At the same time, the jaw clutch is easy to repair and replace, and the maintenance cost is low. 2. By setting up a shift fork assembly and a gear sleeve on the front output shaft, the shift fork of the shift fork assembly controls the operation of the gear sleeve, thereby controlling the switching between high-speed and low-speed gears and increasing the vehicle's adaptability to different road conditions. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation thereof.

[0016] Figure 1 Here is a schematic diagram of the transmission structure of this utility model (where (1) is a schematic diagram of the transfer case; (2) is a schematic diagram of the cross-sectional structure of AA in (1); and (3) is a schematic diagram of a partial cross-sectional structure of (1)). Figure 2 This is a structural schematic diagram of the box-type components; Figure 3 This is a structural schematic diagram of the input component; Figure 4 This is a structural diagram of the intermediate component; Figure 5 This is a schematic diagram of the output component; Figure 6 This is a structural diagram of the shift fork component; in, I. Housing components; II. Input components; III. Intermediate components; IV. Output components; V. Shift fork components; VI. Oil injection pipe components; 1. Front housing; 2. Rear housing; 3. Front output end cover; 9. Input shaft; 91. Input shaft gear; 10. Intermediate shaft; 101. Intermediate shaft gear; 11. First gear; 12. Second gear; 15. Front output flange; 17. Front output shaft; 19. Third gear; 20. Fourth gear; 21. Spring baffle; 22. Spring; 23. Rear output shaft end cover; 24. 1. Rear output shaft; 27. First piston; 29. ​​Spring seat; 30. Gear sleeve; 33. Cylinder body; 35. Second piston; 37. Shift fork shaft; 38. Shift fork shaft sleeve; 39. Shift fork pull rod; 40. Shift fork; 41. Positioning shaft; 43. Positioning sleeve; 44. Seventh bearing; 45. Sixth bearing; 46. Eighth bearing; 47. Ninth bearing; 48. First oil port; 49. Second oil port; 50. Third oil port; 51. First bearing; 52. Second bearing; 53. Third bearing; 54. Fifth bearing. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] For ease of description, in this utility model, the end of the power input transfer case is referred to as the front, and the other end as the rear.

[0026] like Figures 1 to 6 As shown, this utility model discloses a transfer case for a logging transport vehicle in mountainous areas, including a case body component I and an input component II, an intermediate component III, an output component IV, and a shift fork component V disposed within the case body component I.

[0027] like Figure 2 As shown, the housing component I includes a front housing 1, a rear housing 2, a front output end cover 3, and a rear output end cover 25. The front housing 1 and the rear housing 2 are fixedly connected. The front output end cover 3 is installed on the front housing 1, and the rear output end cover 25 is installed on the rear housing 2.

[0028] like Figure 3 As shown, input component II includes an input shaft 9, on which an input gear 91 is fixedly mounted. Specifically, the input gear 91 is integrally formed with the input shaft 9. The front end of the input shaft 9 is supported on the housing component I by a first bearing 51 and a second bearing 52, and the rear end of the input shaft 9 is supported on the housing component I by a third bearing 53. More specifically, in this design, the first bearing 51 and the second bearing 52 are ball bearings, and the third bearing 53 is a cylindrical bearing. A hydraulic motor is mounted on the front end of the input shaft 9 and inputs power into the input component II. The forward or reverse rotation of the hydraulic motor controls the forward and reverse movement of the transfer case.

[0029] like Figure 4 As shown, intermediate component III includes an intermediate shaft 10 and an intermediate shaft gear 101, a first gear 11, and a second gear 12 arranged sequentially from front to back on the intermediate shaft 10. The first gear 11 meshes with the input gear 91 for transmission. Specifically, the intermediate shaft gear 101 is integrally formed with the intermediate shaft 10, and the first gear 11 and the second gear 12 are respectively heat-fitted onto the intermediate shaft 10. The two ends of the intermediate shaft 10 are supported on the housing component I by a fourth bearing and a fifth bearing 54, respectively. More specifically, in this design, the fourth bearing and the fifth bearing 54 are cylindrical bearings.

[0030] like Figure 5 As shown, output component IV includes a front output shaft 17, a third gear 19, a gear sleeve 30, a fourth gear 20, a jaw clutch, and a rear output shaft 24. The front output shaft 17 and the rear output shaft 24 are connected by a jaw clutch. The third gear 19 and the fourth gear 20 are loosely fitted on the front output shaft 17. The gear sleeve 30 is mounted on the front output shaft 17 in a manner that allows axial movement but not circumferential rotation. The gear sleeve 30 is located between the third gear 19 and the fourth gear 20. The third gear 19 meshes with the intermediate shaft gear 101, and the fourth gear 20 meshes with the second gear 12. The two ends of the front output shaft 17 are supported on the front housing 1 by the sixth bearing 45 and the seventh bearing 44, respectively. The two ends of the rear output shaft 24 are supported on the rear output end cover 25 by the eighth bearing 46 and the ninth bearing 47, respectively. Specifically, the sixth bearing 45, the seventh bearing 44, the eighth bearing 46, and the ninth bearing 47 are needle roller bearings. The front end of the front output shaft 17 is provided with a front output flange 15 via a spline, and the rear end of the rear output shaft 24 is provided with a rear output flange via a spline.

[0031] In this design, the shift fork component V is used to drive the toothed sleeve 30 to slide axially so that the toothed sleeve 30 engages with the third gear 19 or the fourth gear 20.

[0032] like Figure 5 As shown, the jaw clutch includes a spring baffle 21, a spring 22, a first piston 27, and a spring seat 29. The spring baffle 21 is fixedly mounted on the front output shaft 17, and the spring seat 29 is mounted on the front output shaft 17 in a manner that allows axial movement but not circumferential rotation. Specifically, the spring seat 29 can be fixedly mounted on the front output shaft 17 via a spline. The spring seat 29 is connected to the rear output shaft 24 via a jaw clutch. The spring 22 is disposed between the spring baffle 21 and the spring seat 29. The first piston 27 is connected to the spring seat 29 and can drive the spring seat 29 to move axially to engage or disengage with the rear output shaft 24.

[0033] like Figure 6 As shown, the shift fork component V includes a hydraulic cylinder 33, a second piston 35, a shift fork shaft 37, a shift fork bushing 38, a shift fork pull rod 39, and a shift fork 40. The hydraulic cylinder 33 is mounted on the housing component I. A first oil port 48 and a second oil port 49 are provided on the side wall of the hydraulic cylinder 33. An installation space for mounting the shift fork shaft 37 is provided between the hydraulic cylinder 33 and the housing component I. One side of the shift fork bushing 38 is connected to the hydraulic cylinder 33, and the other side of the shift fork bushing 38 is connected to the housing component I. The second piston 35 is fixedly arranged on the shift fork shaft 37. One end of the shift fork shaft 37 is axially movable and mounted on the hydraulic cylinder 33. The other end passes through the shift fork bushing 38 and extends out of the installation space, and is fixedly connected to the upper end of the shift fork pull rod 39. The second piston 35 is located in the oil cylinder 33 and between the first oil port 48 and the second oil port 49. Thus, injecting oil into the first oil port 48 or the second oil port 49 can push the second piston 35 to move axially, thereby driving the shift fork shaft 37, the shift fork pull rod 39 and the shift fork 40 to move axially. The lower end of the shift fork pull rod 39 is fixedly connected to the shift fork 40. The shift fork 40 is sleeved on the positioning shaft 41, and the positioning shaft 41 is fixed on the housing component I. The shift fork 40 is connected to the toothed sleeve 30 and can drive the toothed sleeve 30 to slide axially. The first piston 27 of the jaw clutch is axially movable and mounted on the rear output end cover 25. There is an oil filling space between the first piston 27 and the rear output end cover 25. The rear output end cover 25 is provided with a third oil port 50 for injecting oil into the oil filling space. Injecting oil into the third oil port 50 can push the first piston 27 to move axially, thereby driving the spring seat 29 to move axially. The spring 22 is compressed, causing the spring seat 29 to disengage from the rear output shaft 24. When the third oil port 50 is drained, the first piston 27 is reset under the action of the spring 22, and the spring seat 29 is connected to the rear output shaft 24.

[0034] Generally, the transfer case also includes a lubrication pipe assembly VI, which is mounted on the case assembly I. The lubrication pipe assembly VI is used to lubricate the various components of the transfer case.

[0035] The specific implementation method of the transfer case provided by this utility model is as follows: 1. The forward and reverse movement of the transfer case is controlled by the forward or reverse rotation of the hydraulic motor; 2. Gear Shifting Operation: Input shaft 17 meshes with first gear 11 for transmission, intermediate shaft 10 meshes with third gear 19 for transmission, forming the low-speed gear of the transfer case; second gear 12 meshes with fourth gear 20 for transmission, forming the high-speed gear of the transfer case. When pressurized oil enters and is maintained at the first port 48 of cylinder body 31 in shift fork assembly V, it pushes second piston 35 and shift fork 40, causing gear sleeve 30 to slide to the side of fourth gear 20. At this time, fourth gear 20 is fixed to front output shaft 17 through gear sleeve 30, and the transfer case is in high-speed gear. When oil is discharged from the first port 48 of cylinder body 31 in shift fork assembly V, pressurized oil enters and is maintained at the second port 49, pushing second piston 35 and shift fork 40, causing gear sleeve 30 to slide to the side of third gear 19. At this time, third gear 19 is fixed to front output shaft 17 through gear sleeve 30, and the transfer case is in low-speed gear.

[0036] 3. Disengagement Principle: The front output shaft 17 is fixed to the spring seat 29 via a spline, and the spring seat 29 is connected to the rear output shaft 24 via a jaw clamp. Under normal conditions, the jaw clamp between the spring seat 29 and the rear output shaft 24 engages, and the front output shaft 17 and the rear output shaft 24 rotate synchronously, providing output to both the front and rear axles of the transfer case, achieving four-wheel drive. Pressurized oil enters through the third oil port 50 of the rear output end cover 23, pushing the first piston 27 and compressing the spring 22. At this point, the jaw clamp between the spring seat 29 and the rear output shaft 24 disengages, the front axle of the transfer case outputs power normally, and the rear axle has no power output, achieving two-wheel drive. After the pressurized oil is released from the third oil port 50, the spring seat 29 resets by compressing the spring 22, and the front output shaft 17 and the rear output shaft 23 reconnect, restoring the vehicle to four-wheel drive.

[0037] This utility model also discloses a logging transport vehicle for mountainous areas, including a transfer case as described above.

Claims

1. A transfer case for a logging transport vehicle in mountainous areas, comprising a case body component (I) and an input component (II), an intermediate component (III), an output component (IV), and a shift fork component (V) disposed within the case body component (I), characterized in that, The input component (II) includes an input shaft (9) on which an input gear (91) is fixedly mounted. The intermediate component (III) includes an intermediate shaft (10) and an intermediate shaft gear (101), a first gear (11) and a second gear (12) arranged sequentially from front to back on the intermediate shaft (10). The first gear (11) and the input gear (91) mesh and drive each other. The output component (IV) includes a front output shaft (17), a third gear (19), a gear sleeve (30), a fourth gear (20), a dog clutch, and a rear output shaft (24). The front output shaft (17) and the rear output shaft (24) are connected by a dog clutch. The third gear (19) and the fourth gear (20) are both loosely fitted on the front output shaft (17). The gear sleeve (30) is mounted on the front output shaft (17) in a manner that allows axial movement but not circumferential rotation. The gear sleeve (30) is located between the third gear (19) and the fourth gear (20). The third gear (19) meshes with the intermediate shaft gear (101) for transmission, and the fourth gear (20) meshes with the second gear (12) for transmission. The shift fork component (V) is used to drive the toothed sleeve (30) to slide axially so that the toothed sleeve (30) engages with the third gear (19) or the fourth gear (20).

2. The transfer case of a logging transport vehicle in mountainous areas according to claim 1, characterized in that, The jaw clutch includes a spring baffle (21), a spring (22), a first piston (27), and a spring seat (29). The spring baffle (21) is fixedly mounted on the front output shaft (17). The spring seat (29) is mounted on the front output shaft (17) in a manner that allows axial movement but not circumferential rotation. The spring seat (29) is connected to the rear output shaft (24) via a jaw clutch. The spring (22) is disposed between the spring baffle (21) and the spring seat (29). The first piston (27) is connected to the spring seat (29) and can drive the spring seat (29) to move axially to engage or disengage with the rear output shaft (24).

3. The transfer case of a logging transport vehicle in mountainous areas according to claim 1, characterized in that, The shift fork assembly (V) includes a hydraulic cylinder (33), a second piston (35), a shift fork shaft (37), a shift fork bushing (38), a shift fork lever (39), and a shift fork (40). The hydraulic cylinder (33) is mounted on the housing assembly (I). A first oil port (48) and a second oil port (49) are provided on the side wall of the hydraulic cylinder (33). An installation space for mounting the shift fork shaft (37) is provided between the hydraulic cylinder (33) and the housing assembly (I). One side of the shift fork bushing (38) is connected to the hydraulic cylinder (33), and the other side of the shift fork bushing (38) is connected to the housing assembly (I). (37) has a second piston (35) fixedly arranged on it. One end of the shift fork shaft (37) is mounted on the oil cylinder (33) in an axially movable manner. The other end of the shift fork shaft (37) passes through the shift fork shaft sleeve (38) and extends out of the installation space and is fixedly connected to the upper end of the shift fork pull rod (39). The second piston (35) is located in the oil cylinder (33) and between the first oil port (48) and the second oil port (49). The lower end of the shift fork pull rod (39) is fixedly connected to the shift fork (40). The shift fork (40) is connected to the toothed sleeve (30) and can drive the toothed sleeve (30) to slide axially.

4. The transfer case of a logging transport vehicle for mountainous areas according to claim 1, characterized in that, The housing component (I) includes a front housing (1), a rear housing (2), a front output end cover (3), and a rear output end cover (25). The front housing (1) and the rear housing (2) are fixedly connected. The front output end cover (3) is installed on the front housing (1), and the rear output end cover (25) is installed on the rear housing (2). The two ends of the front output shaft (17) are supported on the front housing (1) by the sixth bearing (45) and the seventh bearing (44), respectively. The two ends of the rear output shaft (24) are supported on the rear output end cover (25) by the eighth bearing (46) and the ninth bearing (47), respectively.

5. The transfer case of a logging transport vehicle for mountainous areas according to claim 4, characterized in that, The first piston (27) of the jaw clutch is axially movable and mounted on the rear output end cover (25). An oil filling space is provided between the first piston (27) and the rear output end cover (25). The rear output end cover (25) is provided with a third oil port (50) for injecting oil into the oil filling space.

6. The transfer case of a logging transport vehicle in mountainous areas according to claim 1, characterized in that, The front end of the front output shaft (17) is provided with a front output flange (15) via a spline, and the rear end of the rear output shaft (24) is provided with a rear output flange via a spline.

7. The transfer case of a logging transport vehicle for mountainous areas according to claim 1, characterized in that, The input gear (91) is integrally formed with the input shaft (9), the intermediate shaft gear (101) is integrally formed with the intermediate shaft (10), and the first gear (11) and the second gear (12) are respectively heat-fitted onto the intermediate shaft (10).

8. The transfer case of a logging transport vehicle in mountainous areas according to claim 1, characterized in that, The front end of the input shaft (9) is supported on the housing component (I) by the first bearing (51) and the second bearing (52), and the rear end of the input shaft (9) is supported on the housing component (I) by the third bearing (53); the two ends of the intermediate shaft (10) are supported on the housing component (I) by the fourth bearing and the fifth bearing (54) respectively.

9. The transfer case of a logging transport vehicle in mountainous areas according to claim 1, characterized in that, It also includes an oil injection pipe assembly (VI), which is mounted on the housing assembly (I).

10. A logging transport vehicle for mountainous areas, characterized in that, Includes a transfer case as described in any one of claims 1-9.

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