Motor assembly system with built-in speed reducer

Abstract

The invention belongs to the technical field of motors and discloses a motor assembly system with a built-in speed reducer. A motor comprises a motor body and a speed reducer; the speed reducer is built in a cavity of the motor; a motor rotor spline sleeve is connected with an input shaft of the speed reducer; and an output shaft of the speed reducer is connected with a working machine. The motorassembly system with the built-in speed reducer has the advantages that the torque density is high, the power density is high, the power transmission capacity is high, the structure is compact, the floor space is small, and the motor assembly system with the built-in speed reducer is suitable for electric driven vehicles and other power equipment with large reduction ratio. The motor assembly system with the built-in speed reducer has the advantages that the transmission efficiency is high, the structure is compact, the power density is high, the torque density is high, and the motor assemblysystem with the built-in speed reducer is suitable for various electric driving devices.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a motor assembly system with a built-in reducer. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Due to the outstanding characteristics of large-scale centralized production, long-distance economic transmission, and intelligent automatic control, electric energy has become the main energy source for human production and activities. Correspondingly, the application of electric drive devices is becoming more and more extensive. The motor is the power component of the electric drive device. It has a series of advantages such as high working efficiency, no pollution to the environment, low working noise, convenient use and control, reliable operation, low price, and firm structure. Therefore, it is used in industrial and agricultural production, transportation, Widely used in national defense, comm...

AI Technical Summary

Problems solved by technology

Most of the existing technical solutions make the motor and the reducer into independent transmission. The disadvantage is that it occupies a large working space. Under some conditions with high requirements for actual space, this independent transmission solution is greatly limited.

[0006] (2) For vehicles driven by in-wheel motors, in-wheel motors and reducers are located inside the wheels, which belong to the unsprung mass. The existing integration of the inner rotor high-speed motor and the wheel-side reducer with independent in-wheel motors inevitably increases the unsprung mass. The increase of the unsprung mass greatly reduces the handling and stability of the vehicle, and also affects the acceleration performance of the vehicle to a certain extent. Therefore, reducing the increase of the unsprung mass caused by the integrated system of the hub motor is the current application research of the hub motor core direction

[0007] (3) For vehicles driven by in-wheel motors, due to the unstable working conditions of the in-wheel motors, harsh working environment, and poor heat dissipation conditions, it is easy to cause the in-wheel motors to heat up. The heating of the in-wheel motors will seriously affect the working efficiency of the motor and the service life of the motor. Part of the heat will be transferred to the reducer, causing the temperature rise of the reducer lubricating oil, which will affect the transmission efficiency of the reducer and the service life of the reducer lubricating oil, increase the maintenance cost of the hub motor assembly, and reduce the reliability

The existing cooling and lubrication methods for hub motor assemblies are independent cooling of the motor shell and independent lubrication of the reducer. This method has great limitations in controlling the temperature of the hub motor assembly, and there is still a lot of room for improvement in its technical methods

[0008] (4) For vehicles driven by in-wheel motors, considering the driving and braking requirements of the vehicle, in addition to the motor and reducer, the in-wheel motor assembly also needs to arrange a braking device. The existing independent transmission method of the motor and reducer leads to The space between the motor and the motor is not fully utilized. In order to make full use of the internal space of the wheel and reduce the size of the assembly, the braking device can only be arranged between the motor and the rim, and the independently arranged reducer has a large radial size, so Disc brakes only

This method of brake device arrangement has two disadvantages: 1. The brake device can only be located between the rim and the motor, which reduces the flexibility of the arrangement of the hub motor assembly. At the same time, due to the large outer diameter of the motor, the brake device The space in which it is located is relatively airtight and the air flow is poor, which is not conducive to the cooling of the brake device, resulting in thermal decay, which affects the safety of the vehicle

2. The brake device can only use disc brakes. The cost of disc brakes is higher than that of drum brakes, which increases the production cost of the hub motor assembly and reduces the scope of application of the hub motor assembly. Mining vehicles with greater demand should first consider drum brakes

[0012] (2) Reducing the unsprung mass can effectively improve the handling and stability of the vehicle, and also increase the acceleration performance of the vehicle to a certain extent. The unsprung mass mainly includes the mass of the tire rim, the mass of the motor, the mass of the reducer, and the mass of the braking device , under the premise of ensuring the reliability of the overall structure, a feasible way to reduce the unsprung mass is to use high-strength materials, but this will undoubtedly increase the production cost of the hub motor assembly, which is not conducive to its industrialization. Therefore, the unsprung mass The reduction must also start with the collaborative optimization of the hub motor assembly

The layout of the hub motor is mainly the arrangement of the motor, reducer, and braking device, but the arrangement and combination of the three is limited by many aspects, which cannot effectively solve the problem of flexible layout of the hub motor. Therefore, it is necessary to consider A new form of arrangement

Images