Multi-input transfer case

Abstract

The utility model discloses a multi-input transfer case, which belongs to the technical field of engineering machinery and comprises a shell, an input shaft assembly and an output shaft assembly, the input shaft assembly and the output shaft assembly are arranged in the shell, the input shaft assembly comprises a first input bearing gear and a second input shaft gear which are sleeved on an input shaft, and a boss is coaxially arranged on one side of the first input shaft gear. In the mounted state, the second input shaft gear is rotatable about the input shaft. Due to the fact that the first input shaft gear with the boss is arranged, the first input shaft gear can be adjusted to be in the best meshing state in the assembling process, and then the second input shaft gear is in butt joint with the boss after being adjusted to be in the best meshing state. The first input shaft gear and the second input shaft gear can reach the optimal meshing state after being assembled, and the assembling efficiency and the transmission effect can be effectively improved.

Description

Technical Field

[0001] This utility model relates to a multi-input transfer case, belonging to the field of engineering machinery technology. Background Technology

[0002] High-speed wheeled excavators are a major piece of equipment in the construction machinery field, playing a vital role in construction, urban development, and disaster relief. Because the excavator's power unit is located in the upper structure, and the upper structure needs to rotate 360° during operation, the engine's power transmission system cannot directly transmit power to the drive axle of the lower structure. Instead, the machine's movement is primarily achieved through the engine driving a hydraulic travel motor to power the transfer case. The transfer case then drives the drive shaft to power the front and rear axles. The transfer case, located between these two structures, is a key core component of the high-speed wheeled excavator's chassis transmission system. The transfer case features a horizontally arranged hydraulic motor with four inputs and two outputs, satisfying the spatial arrangement of the high-speed wheeled excavator's chassis transmission system. The transfer case incorporates high and low gear shifting control, enabling it to transmit power at two different speed ratios, simultaneously providing the dual output requirements of maximum vehicle speed and maximum traction under the same power input unit conditions. The internal high and low gear structure of the transfer case is crucial for achieving these functional output requirements.

[0003] In existing four-input, two-output transfer cases, the input shaft large gear and input shaft small gear in the input shaft assemblies on both sides are connected by internal and external splines. There is a limiting angle between the internal spline teeth of the input shaft large gear and its own external teeth, and their machining processes are unrelated. This results in the input shaft large gear and input shaft small gear not being able to freely install their internal and external splines when the high-speed gears are in the optimal meshing position. Furthermore, the input shaft large gear needs to be rotated one full turn for each gear to be paired, which significantly affects the assembly efficiency of the entire transfer case. Additionally, the assembled gears may not necessarily reach the optimal meshing point during transmission. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-input transfer case that aims to optimize the meshing state of the assembled gears.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] This utility model provides a multi-input transfer case, including a housing;

[0007] The housing contains an input shaft assembly and an output shaft assembly that are mutually connected in a transmission manner.

[0008] The input shaft assembly includes an input shaft and a first input shaft gear and a second input shaft gear coaxially mounted on the input shaft.

[0009] A boss is coaxially provided on one side of the first input shaft gear, and the second input shaft gear is detachably connected to the boss;

[0010] In the installed state, the second input shaft gear can rotate around the input shaft. This allows the first input shaft gear to be assembled first, and then the second input shaft gear to be adjusted and assembled according to the actual meshing state. This ensures that both the first and second input shaft gears achieve optimal meshing after assembly, effectively improving assembly efficiency and transmission performance.

[0011] Furthermore, the boss is connected to the second input shaft gear by a plurality of circumferentially distributed fixing bolts. The plurality of fixing bolts provide a stable connection between the boss and the second input shaft gear, resulting in a robust structure and convenient installation.

[0012] Furthermore, the boss is annular and integrally formed with the first input shaft gear. The integrally formed first input shaft gear and boss have good structural strength, which can ensure the operational stability of the transfer case.

[0013] Furthermore, the output shaft assembly includes an output shaft and a first output shaft gear and a second output shaft gear sleeved on the output shaft;

[0014] The first output shaft gear meshes with the second input shaft gear; the second output shaft gear meshes with the first input shaft gear.

[0015] Furthermore, the output shaft is fitted with first bearings corresponding to the first output shaft gear and the second output shaft gear respectively;

[0016] The first output shaft gear and the second output shaft gear are sleeved on the corresponding first bearing.

[0017] Furthermore, the inner bore of the second input shaft gear is in clearance fit with the outer circle of the input shaft. Due to this clearance fit, the second input shaft gear can rotate freely during installation, facilitating the operator to adjust its meshing state.

[0018] Furthermore, the first bearing is an oil-free bearing.

[0019] Furthermore, a shift fork is provided between the first output shaft gear and the second output shaft gear to connect the first output shaft gear or the second output shaft gear to the output shaft.

[0020] Furthermore, the diameter of the first input shaft gear is larger than that of the second input shaft gear.

[0021] Furthermore, the diameter of the first output shaft gear is larger than that of the second output shaft gear.

[0022] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0023] This invention provides a multi-input transfer case. A boss is provided on one side of the first input shaft gear, and a second input shaft gear, also mounted on the input shaft, is detachably engaged with the boss. During installation, the first input shaft gear can be adjusted to its optimal meshing state first, and then the second input shaft gear can be adjusted to its optimal meshing state before being engaged and fixed with the boss. In this invention, both the first and second input shaft gears achieve optimal meshing after assembly, effectively improving assembly efficiency and transmission performance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the internal structure of a multi-input transfer case provided in an embodiment of this utility model;

[0025] Reference numerals: 1. Housing; 2. Boss; 3. First input shaft gear; 4. Second bearing; 5. First output shaft gear; 6. Output shaft; 7. First bearing; 8. Spline sleeve; 9. Second output shaft gear; 10. Input shaft; 11. Second input shaft gear. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., 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.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances. Example

[0029] This embodiment describes a multi-input transfer case, including: housing 1, input shaft assembly and output shaft assembly.

[0030] like Figure 1 As shown, the input shaft assembly and the output shaft assembly are housed within the housing 1 and are interconnected for transmission. The input shaft assembly includes an input shaft 10 and a first input shaft gear 3 and a second input shaft gear 11 coaxially mounted on the input shaft 10. A second bearing 4 is sleeved near the end of the input shaft 10, allowing the input shaft 10 to be rotatably mounted within the housing 1 via the second bearing 4. A coaxially mounted boss 2 is fixed to one side of the first input shaft gear 3. The second input shaft gear 11 has at least a first state and a second state; in the first state, the second input shaft gear 11 can rotate around the input shaft 10, and in the second state, the second input shaft gear 11 is detachably engaged with the boss 2. Therefore, during assembly, the first input shaft gear 3 can be adjusted to the optimal meshing state first, and then the second input shaft gear 11 can be adjusted to the optimal meshing state before being engaged and fixed with the boss 2. In this invention, both the first input shaft gear 3 and the second input shaft gear 11 can achieve optimal meshing after assembly, which can significantly improve assembly efficiency and transmission effect.

[0031] In this embodiment, the diameter of the first input shaft gear 3 is larger than that of the second input shaft gear 11; that is, the first input shaft gear 3 is a large gear, and the second input shaft gear 11 is a small gear. Correspondingly, the output shaft assembly includes an output shaft 6 and a first output shaft gear 5 and a second output shaft gear 9 mounted on the output shaft 6. The first output shaft gear 5 is a large gear, and the second output shaft gear 9 is a small gear. Therefore, in this embodiment, the first output shaft gear 5 meshes with the second input shaft gear 11, and the second output shaft gear 9 meshes with the first input shaft gear 3.

[0032] For example, the boss 2 is connected to the second input shaft gear 11 by a plurality of circumferentially distributed fixing bolts. The plurality of fixing bolts can be evenly stressed, thereby stably fixing the boss 2 and the second input shaft gear 11.

[0033] Furthermore, the inner hole of the second input shaft gear 11 is in clearance fit with the outer circle of the input shaft 10.

[0034] In a preferred embodiment, the boss 2 is annular and integrally formed with the first input shaft gear 3 and the input shaft 10. The integrally formed structure of the first input shaft gear 3, the input shaft, and the boss 2 is stable and can also ensure the stability of the second input shaft gear 11 with which the boss 2 is connected.

[0035] It should be added that the output shaft 6 is fitted with first bearings corresponding to the first output shaft gear 5 and the second output shaft gear 9, respectively. The first output shaft gear 5 and the second output shaft gear 9 are fitted onto the corresponding first bearings 7.

[0036] Furthermore, it should be noted that both ends of the input shaft 10 are connected to external power input devices, and both ends of the output shaft 6 are connected to external power output devices, resulting in a total of four inputs and two outputs. A splined sleeve 8 is slidably mounted on the output shaft 6 between the first output shaft gear 5 and the second output shaft gear 9. The splined sleeve 8 is used to connect a shift fork mechanism that matches the first output shaft gear 5 and the second output shaft gear 9. The splined sleeve 8 can slide on the input shaft 10 via spline guidance, thereby allowing gear shifting to be adjusted via the shift fork mechanism.

[0037] In summary, the application process of the multi-input transfer case provided in this embodiment involves the following steps:

[0038] During assembly, first install one side of the input shaft assembly, then mate and fix the second input shaft gear 11 of that side's input shaft assembly with the boss 2. Next, assemble the output shaft assembly, and then assemble the other side's input shaft assembly. After adjusting the optimal meshing position of each gear, finally use fixing bolts to mate and fix the second input shaft gear 11 of the other side with the boss 2. Because the inner hole of the second input shaft gear 11 has a small clearance fit with the outer circle of the input shaft 10, the axial alignment of all parts on the entire input shaft assembly is effectively ensured, and the assembly efficiency of the entire transfer case is also effectively improved. Example

[0039] The difference between this embodiment and embodiment 1 is that the boss 2 in this embodiment is a symmetrical arc-shaped platform structure. The two arc-shaped platforms are also integrally formed with the first input shaft gear 3 and the input shaft 10. The same number of fixing bolts are set on the two arc-shaped platforms, which can also realize the docking with the second input shaft gear 11. However, compared with the ring structure boss 2 in embodiment 1, the weight is reduced and the raw material cost is reduced. Example

[0040] The difference between this embodiment and Embodiment 1 is that in this embodiment, the diameter of the first input shaft gear 3 is smaller than that of the second input shaft gear 11, i.e., the first input shaft gear 3 is a small gear and the second input shaft gear 11 is a large gear. Correspondingly, the first output shaft gear 5 is a small gear and the second output shaft gear 9 is a large gear. Similarly, in this embodiment, the first output shaft gear 5 meshes with the second input shaft gear 11, and the second output shaft gear 9 meshes with the first input shaft gear 3.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-input transfer case, characterized in that, Includes the casing; The housing contains an input shaft assembly and an output shaft assembly that are mutually connected in a transmission manner. The input shaft assembly includes an input shaft and a first input shaft gear and a second input shaft gear coaxially mounted on the input shaft. A boss is coaxially provided on one side of the first input shaft gear, and the second input shaft gear is detachably connected to the boss; In the installed state, the second input shaft gear is capable of rotating around the input shaft.

2. The multi-input transfer case according to claim 1, characterized in that, The boss is connected to the second input shaft gear by a plurality of circumferentially distributed fixing bolts.

3. The multi-input transfer case according to claim 1, characterized in that: The boss is annular and is integrally formed with the first input shaft gear.

4. The multi-input transfer case according to claim 1, characterized in that: The output shaft assembly includes an output shaft and a first output shaft gear and a second output shaft gear sleeved on the output shaft; The first output shaft gear meshes with the second input shaft gear; the second output shaft gear meshes with the first input shaft gear.

5. The multi-input transfer case according to claim 4, characterized in that: The output shaft sleeve is provided with first bearings corresponding to the first output shaft gear and the second output shaft gear respectively; The first output shaft gear and the second output shaft gear are sleeved on the corresponding first bearing.

6. The multi-input transfer case according to claim 1, characterized in that: The inner hole of the second input shaft gear is clearance-fitted with the outer circle of the input shaft.

7. The multi-input transfer case according to claim 5, characterized in that: The first bearing is an oil-free bearing.

8. The multi-input transfer case according to claim 4, characterized in that: A shift fork is provided between the first output shaft gear and the second output shaft gear to connect the first output shaft gear or the second output shaft gear to the output shaft.

9. The multi-input transfer case according to claim 1, characterized in that: The diameter of the first input shaft gear is larger than that of the second input shaft gear.

10. The multi-input transfer case according to claim 4, characterized in that: The diameter of the first output shaft gear is larger than that of the second output shaft gear.

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