High-rotating-speed connecting shafting assembly, transmission and automobile

Abstract

The utility model discloses a high-rotating-speed connecting shaft system assembly which is arranged in a transmission shell, the transmission shell comprises a front shell, a middle shell and a rear shell which are connected, and the high-rotating-speed connecting shaft system assembly comprises a supported shaft and a supporting assembly used for supporting the supported shaft. The supported shaft comprises a first shaft and a second shaft which are coaxially connected, the supporting assembly comprises a first bearing, a second bearing and a third bearing which are sequentially distributed from front to back in the axial direction of the first shaft, and a high-speed oil seal is arranged at the end, away from the second bearing, of the first bearing; the high-speed oil seal and the first bearing are both connected with the front shell, the second bearing is connected with the middle shell, and the third bearing is connected with the rear shell. Two supported shafts are connected through an internal spline and an external spline which can be in clearance fit; the supporting assembly adopts an arrangement mode of three bearings, axial positioning of a supported shaft is achieved through structural design, and reliability and stability of power transmission in the gearbox are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of transmissions, and specifically relates to a high-speed connecting shaft assembly, transmission, and automobile. Background Technology

[0002] Electric vehicles have become a focus of automotive research and development due to their advantages such as energy saving and low emissions. For special working conditions, it is necessary to equip vehicles with transmissions that can operate without power interruption. Such transmissions require a power transmission shaft with a large axial length when inputting high speeds. However, an excessively long axial length is not conducive to machining. If bearings are used for positioning at both ends, the shaft system is prone to large deflection deformation, which affects the force on the bearings at both ends and causes uneven wear. At the same time, it will also affect the structural strength of related components, resulting in a decrease in the reliability and stability of the power transmission of the gearbox. Utility Model Content

[0003] The purpose of this invention is to provide a high-speed connecting shaft assembly, transmission, and automobile to solve the technical problem of reduced reliability and stability of power transmission in the transmission due to the easy deformation of long shafts in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A high-speed connecting shaft assembly is disposed within a transmission housing. The transmission housing includes a front housing, a middle housing, and a rear housing connected together. The high-speed connecting shaft assembly includes a supported shaft and a support assembly for supporting the supported shaft. The supported shaft includes a first shaft and a second shaft coaxially connected. The support assembly includes a first bearing, a second bearing, and a third bearing distributed sequentially from front to back along the axial direction of the first shaft. A high-speed oil seal is provided at the end of the first bearing away from the second bearing.

[0006] The high-speed oil seal and the No. 1 bearing are both connected to the front housing, the No. 2 bearing is connected to the middle housing, and the No. 3 bearing is connected to the rear housing.

[0007] This utility model also has the following technical features:

[0008] Specifically, the outer peripheral surface of the rear end of the first shaft is provided with an external spline, and the front end of the second shaft is provided with an internal spline hole that can be clearance-fitted with the external spline.

[0009] Furthermore, the No. 1, No. 2, and No. 3 bearings are all deep groove ball bearings.

[0010] Furthermore, the inner lip of the high-speed oil seal is interference-fitted with the journal of the first shaft.

[0011] Furthermore, a first retaining ring for axial positioning of the first shaft is sleeved on the first shaft, and a second retaining ring for axial positioning of the second shaft is sleeved on the second shaft.

[0012] Furthermore, the second retaining ring is limited by a bearing pressure plate sleeved on the second shaft.

[0013] Furthermore, the end of the third bearing furthest from the second bearing is connected to a bearing cap, which is connected to the rear housing.

[0014] This utility model also protects a transmission, including the above-mentioned high-speed connecting shaft assembly.

[0015] This utility model also protects an automobile, including the above-described high-speed connecting shaft assembly or the above-described transmission.

[0016] Compared with the prior art, this utility model has the following technical effects:

[0017] In the high-speed connecting shaft assembly provided by this utility model, the No. 1 shaft and the No. 2 shaft, which serve as the supported shafts, are connected by internal and external splines that can be clearance-fitted. This ensures transmission stability, effectively improves the coaxiality of the spline mating end faces, and reduces abnormal wear caused by off-center load. Finally, the power is transmitted to the rear transmission system through the shaft teeth of the No. 2 shaft. The support component in this utility model adopts a three-bearing arrangement, and the axial positioning of the supported shaft is achieved through structural design, ensuring the reliability and stability of power transmission in the gearbox. Attached Figure Description

[0018] Figure 1 This is a partial structural schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0020] 1-Front housing, 2-Middle housing, 3-Rear housing, 4-Supported shaft, 5-Support assembly, 6-High-speed oil seal, 7-First retaining ring, 8-Second retaining ring, 9-Bearing pressure plate, 10-Bearing cover; 41-Shaft No. 1, 42-Shaft No. 2; 51-Bearing No. 1, 52-Bearing No. 2, 53-Bearing No. 3. Detailed Implementation

[0021] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0022] The terms "upper," "lower," "front," and "rear" used in this utility model are for ease of description and simplification only, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "Inner" and "outer" refer to the inner and outer contours of the corresponding components, and should not be construed as limitations on this utility model. Furthermore, the ordinal numbers "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 indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0023] In this invention, unless otherwise stated, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Unless otherwise specified, all components in this utility model can be purchased from the market.

[0025] Example 1

[0026] Following the above technical solutions, such as Figure 1 As shown, this embodiment provides a high-speed connecting shaft assembly disposed within a transmission housing. The transmission housing includes a front housing 1, a middle housing 2, and a rear housing 3 connected together. The high-speed connecting shaft assembly includes a supported shaft 4 and a support assembly 5 for supporting the supported shaft 4. The supported shaft 4 includes a first shaft 41 and a second shaft 42 coaxially connected. The first shaft 41 is located in the front housing formed by the front housing 1 and the middle housing 2 and is used for torque speed. The second shaft 42 is located in the rear housing formed by the middle housing 2 and the rear housing 3 and has a gear structure. A high-speed oil seal is installed at the front end of the first shaft 41. Because there is no external load, the first shaft 41 does not undergo flexible deformation, and the runout at the high-speed oil seal can be completely controlled, reducing the risk of oil seal failure and making the system more stable and reliable.

[0027] The support assembly 5 includes a first bearing 51, a second bearing 52 and a third bearing 53 distributed sequentially from front to back along the first shaft 41. A high-speed oil seal 6 is provided at the end of the first bearing 51 away from the second bearing 52, and the high-speed oil seal 6 is also sleeved on the support shaft 4.

[0028] The high-speed oil seal 6 and the first bearing 51 are both connected to the front housing 1, the second bearing 52 is connected to the middle housing 2, and the third bearing 53 is connected to the rear housing 3.

[0029] The second bearing 52 is positioned by the middle housing 2, and the third bearing 53 is positioned by the rear housing 3.

[0030] In a preferred embodiment, the outer peripheral surface of the rear end of the first shaft 41 is provided with an external spline, and the front end of the second shaft 42 is provided with an internal spline hole that can clearance-fit the external spline. The clearance-fitting internal spline hole and external spline ensure transmission stability, effectively improve the coaxiality of the spline mating end faces, and reduce abnormal wear caused by off-center loading. Furthermore, an external spline is also provided on the outer peripheral surface of the front end of the first shaft 41, and the external spline at the front end and rear end of the first shaft 41 uses the same spline machining parameters. This eliminates the need for tool changes during the machining of the first shaft, and ensures that the spline parameters and length remain consistent, significantly improving the machining efficiency of individual parts.

[0031] As a preferred embodiment, the No. 1 bearing 51, the No. 2 bearing 52 and the No. 3 bearing 53 are all deep groove ball bearings.

[0032] As a preferred embodiment, the inner lip of the high-speed oil seal 6 is interference-fitted with the journal of the first shaft 41.

[0033] In a preferred embodiment, a first retaining ring 7 for axial positioning of the first shaft 41 is fitted onto the first shaft 41, and a second retaining ring 8 for axial positioning of the second shaft 42 is fitted onto the second shaft. The second retaining ring 8 is engaged in the retaining ring groove of the second bearing 52.

[0034] As a preferred embodiment, the second retaining ring 8 is limited by the bearing pressure plate 9 sleeved on the second shaft 42.

[0035] As a preferred embodiment, the end of the third bearing 53 away from the second bearing 52 is connected to a bearing cover 10, and the bearing cover 10 is connected to the rear housing 3.

[0036] In summary, through the above structural design, power is input from the front spline of the first shaft 41, transmitted to the second shaft 42 through spline engagement, and finally transmitted to the rear transmission system through the shaft teeth of the second shaft 42.

[0037] Example 2

[0038] This embodiment provides a transmission, including the high-speed connecting shaft assembly provided in Embodiment 1.

[0039] Example 3

[0040] This embodiment provides an automobile, including the high-speed connecting shaft assembly provided in this embodiment or the transmission provided in embodiment 2.

[0041] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

Claims

1. A high-speed connecting shaft assembly, disposed within a transmission housing, the transmission housing comprising a front housing (1), a middle housing (2), and a rear housing (3) connected together, characterized in that, The high-speed connecting shaft assembly includes a supported shaft (4) and a support assembly (5) for supporting the supported shaft (4); the supported shaft (4) includes a first shaft (41) and a second shaft (42) coaxially connected; the support assembly (5) includes a first bearing (51), a second bearing (52) and a third bearing (53) distributed sequentially from front to back along the axial direction of the first shaft (41); a high-speed oil seal (6) is provided at the end of the first bearing (51) away from the second bearing (52), and the high-speed oil seal (6) is also sleeved on the support shaft (4); The high-speed oil seal (6) and the first bearing (51) are both connected to the front housing (1), the second bearing (52) is connected to the middle housing (2), and the third bearing (53) is connected to the rear housing (3).

2. The rotational speed connecting shaft assembly as described in claim 1, characterized in that, The outer peripheral surface of the rear end of the first shaft (41) is provided with an external spline, and the front end of the second shaft (42) is provided with an internal spline hole that can be clearance-fitted with the external spline.

3. The rotational speed connecting shaft assembly as described in claim 1, characterized in that, The No. 1 bearing (51), No. 2 bearing (52), and No. 3 bearing (53) are all deep groove ball bearings.

4. The rotational speed connecting shaft assembly as described in claim 1, characterized in that, The inner lip of the high-speed oil seal (6) is in an interference fit with the journal of the first shaft (41).

5. The rotational speed connecting shaft assembly as described in claim 1, characterized in that, A first retaining ring (7) for axial positioning of the first shaft (41) is sleeved on the first shaft (41), and a second retaining ring (8) for axial positioning of the second shaft (42) is sleeved on the second shaft (42).

6. The rotational speed connecting shaft assembly as described in claim 5, characterized in that, The second retaining ring (8) is limited by the bearing pressure plate (9) sleeved on the second shaft (42).

7. The rotational speed connecting shaft assembly as described in claim 1, characterized in that, The end of the No. 3 bearing (53) away from the No. 2 bearing (52) is connected to a bearing cover (10), and the bearing cover (10) is connected to the rear housing (3).

8. A transmission, characterized in that, Includes the high-speed connecting shaft assembly as described in any one of claims 1 to 7.

9. A car, characterized in that, It includes the speed-connected shaft assembly as described in any one of claims 1 to 7 or the device as described in claim 8.

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