Distributed drive reduction bearing structure

Abstract

The utility model relates to vehicle speed reducer technical field, concretely is a kind of distributed drive reduction bearing structure, including speed reducer body, and speed reducer body includes the input assembly, transmission assembly and output assembly that engage in turn, and input assembly is one level driving gear shaft, and one level driving gear shaft is connected with a motor shaft through spline, and motor shaft drives one level driving gear shaft transmission, and the side wall of one level driving gear shaft is equipped with angular contact ball bearing and first cylindrical roller bearing.The utility model is equipped with angular contact ball bearing and first cylindrical roller bearing on the side of speed reducer, and no longer be equipped with bearing on motor shaft, shorten the axial dimension of motor shaft, so that the space utilization of distribution bridge motor shaft side is improved, reach the purpose that distribution bridge light weight, simplify structure, meet the requirement of large torque, high speed simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of vehicle reducer technology, specifically a distributed drive reduction bearing structure. Background Technology

[0002] Planetary gear reducers are key components widely used in industrial transmission systems. They are also prevalent in the drive systems of new energy vehicles, primarily converting the high-speed, low-torque output of an electric motor into the low-speed, high-torque power required by the wheels. In electric vehicles, planetary gear reducers are typically deeply integrated with the drive motor. Their compact structure and efficient transmission characteristics significantly improve energy utilization and driving range. The bearing arrangement directly affects the reducer's load-bearing capacity, operational stability, lifespan, and efficiency.

[0003] Existing planetary gear reducers have bearings on both sides of the motor shaft and the reducer, which increases the axial dimension and requires reserved installation space on both sides of the motor shaft and the reducer, which conflicts with the lightweight and miniaturization requirements of new energy vehicles.

[0004] In addition, existing technologies also place bearings in the inner ring of the planetary carrier, which significantly increases cost, complexity and maintenance burden while improving rigidity and precision, and the contradictions are prominent in high-speed and highly integrated scenarios. Utility Model Content

[0005] The purpose of this invention is to change the arrangement structure of the reducer bearings, solve the problem of structural redundancy in the planetary gear reducer, improve the internal space utilization of the reducer, make its structure more compact and stable, achieve the goal of lightweighting, and at the same time meet the requirements of high torque and high speed.

[0006] The present invention adopts the following technical solution: A distributed drive reduction bearing structure is disclosed, wherein the input component is a primary drive gear shaft, the primary drive gear shaft is connected to a motor shaft via a spline, the motor shaft drives the primary drive gear shaft, and the side wall of the primary drive gear shaft is provided with an angular contact ball bearing and a first cylindrical roller bearing.

[0007] Furthermore, the transmission assembly includes a primary driven gear and a secondary driving gear shaft fixedly connected by a spline, and the secondary driving gear shaft is provided with a first tapered roller bearing on each side.

[0008] Furthermore, the output component consists of a secondary driven gear and a planetary gear assembly. The planetary gear assembly includes planetary gears, a planet carrier, and a sun gear shaft. The secondary driven gear is interference-fitted with the sun gear shaft. One end of the sun gear shaft meshes with the planetary gears. The planetary gears mesh with the gear rings on the planet carrier.

[0009] Furthermore, two second tapered roller bearings are spaced apart on the shaft wall of the sun gear shaft, and the two second tapered roller bearings are respectively located on both sides of the second-stage driven gear. Two deep groove ball bearings are also spaced apart on the shaft wall of the sun gear shaft, and the two deep groove ball bearings are respectively located on both sides of the planet carrier. A second cylindrical roller bearing is provided inside the planet carrier.

[0010] Furthermore, the deep groove ball bearing is interference-fitted onto the shaft wall of the sun gear shaft.

[0011] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages: 1. This utility model has a bearing on only one side of the reducer, and no bearing on the motor shaft. This shortens the axial dimension of the motor shaft, improves the space utilization on the side of the distributed bridge motor shaft, and achieves lightweighting and structural simplification of the distributed bridge. At the same time, the bearing on the reducer side adopts angular contact ball bearings and first cylindrical roller bearings. The angular contact ball bearings can be used to bear the left and right axial forces, and the first cylindrical roller bearings can be used to bear the radial forces, thus meeting the requirements of high torque and high speed at the same time.

[0012] 2. The bearing in the inner ring of the planetary carrier of this utility model is a cylindrical roller bearing. Compared with the prior art, the planetary gear set structure of the planetary reducer is more compact and stable, which is conducive to shortening the radial dimension of the planetary gear set of the reducer and improving the radial load-bearing capacity and impact resistance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 Sectional view along the AA direction.

[0015] The following are the labels in the figure: 10 for the first-stage drive gear shaft, 11 for the four-point angular contact ball bearing, 12 for the first cylindrical roller bearing, 20 for the first-stage driven gear, 30 for the second-stage drive gear shaft, 31 for the first tapered roller bearing, 40 for the second-stage driven gear, 50 for the sun gear shaft, 51 for the second tapered roller bearing, 52 for the deep groove ball bearing, 60 for the planetary gear, 70 for the planet carrier, 71 for the second cylindrical roller bearing, and 80 for the gear ring. Detailed Implementation

[0016] The specific implementation of the present invention will now be described with reference to the accompanying drawings.

[0017] Reference Figure 1 and Figure 2A distributed drive reduction bearing structure includes a reducer body, which comprises an input component, a transmission component, and an output component. The input component is a primary drive gear shaft 10, one end of which is connected to the motor shaft of a drive motor via a spline. The other side is equipped with a four-point angular contact ball bearing 11 and a first cylindrical roller bearing 12, shortening the axial dimension of the motor shaft and improving the space utilization on one side of the distributed bridge motor shaft. The four-point angular contact ball bearing 11 bears lateral axial forces, and the first cylindrical roller bearing 12 bears radial forces. Both bearings are locked with anti-loosening nuts on the same side to prevent axial movement. The motor shaft of the drive motor drives the primary drive gear shaft 10 to rotate.

[0018] Reference Figure 1 and Figure 2 The transmission assembly consists of a primary driven gear 20 and a secondary driving gear shaft 30. The primary driven gear 20 meshes with one end of the primary driving gear 10, and the primary driven gear 20 and the secondary driving gear shaft 30 are fixedly connected by a spline. Pairs of first tapered roller bearings 31 are provided on both sides of the secondary driving gear shaft 30 to withstand axial and radial forces. The primary driving gear shaft 10 drives the primary driven gear 20 to rotate, thereby driving the secondary driving gear shaft 30 to rotate.

[0019] Reference Figure 1 and Figure 2 The output assembly consists of a secondary driven gear 40 and a planetary gear assembly. The secondary driven gear 40 meshes with the secondary driving gear shaft 30. The planetary gear assembly includes planetary gears 60, a planet carrier 70, and a sun gear shaft 50. One end of the sun gear shaft 50 meshes with the planetary gear 60, and the other end is interference-fitted with the secondary driven gear 40. The planetary gear 60 meshes with the ring gear 80 on the planet carrier 70. Second tapered roller bearings 51 are respectively provided on both sides of the secondary driven gear 40 on the shaft wall of the sun gear shaft 50. Deep groove ball bearings 50 are respectively provided on both sides of the planet carrier 70 on the shaft wall of the sun gear shaft 50.

[0020] The planetary carrier 70 houses a second cylindrical roller bearing 71 without an inner ring. The end of the sun gear shaft 50 serves as the inner ring raceway, making the planetary gear assembly structure of the reducer more compact and stable, and helping to shorten the radial dimension of the planetary gear assembly. The second-stage driving gear shaft 30 drives the second-stage driven gear 40 to rotate, which in turn drives the sun gear shaft 50 to rotate. The sun gear shaft 50 then drives the planetary gears 60, thereby causing the planetary carrier 70 to rotate.

[0021] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A distributed drive reduction bearing structure, comprising a reducer body, wherein the reducer body includes an input component, a transmission component, and an output component that are sequentially meshed, characterized in that: The input component is a primary drive gear shaft, which is connected to a motor shaft via a spline. The motor shaft drives the primary drive gear shaft. An angular contact ball bearing and a first cylindrical roller bearing are provided on the side wall of the primary drive gear shaft.

2. The distributed drive reduction bearing structure according to claim 1, characterized in that: The transmission assembly includes a primary driven gear and a secondary driving gear shaft fixedly connected by a spline, and a first tapered roller bearing is provided on both sides of the secondary driving gear shaft.

3. The distributed drive reduction bearing structure according to claim 1, characterized in that: The output component consists of a secondary driven gear and a planetary gear assembly. The planetary gear assembly includes planetary gears, a planet carrier, and a sun gear shaft. The secondary driven gear is interference-fitted with the sun gear shaft. One end of the sun gear shaft meshes with the planetary gears. The planetary gears mesh with the gear rings on the planet carrier.

4. The distributed drive reduction bearing structure according to claim 3, characterized in that: The sun gear shaft has two second tapered roller bearings spaced apart on its shaft wall, which are located on both sides of the second-stage driven gear. The sun gear shaft also has two deep groove ball bearings spaced apart on its shaft wall, which are located on both sides of the planet carrier. The planet carrier contains second cylindrical roller bearings.

5. The distributed drive reduction bearing structure according to claim 4, characterized in that: The deep groove ball bearing is interference-fitted onto the shaft wall of the sun gear shaft.

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