Motor direct-drive automobile electric power steering (EPS) device

Abstract

The invention discloses a motor direct-drive automobile electric power steering (EPS) device and aims at changing the worm and the worm wheel driving modes of the traditional EPS system of an automobile steering gear and using the driving mode of an output shaft of a motor direct-drive assembly as a substitute so as to overcome a series of defects of the old type driving mode. The motor direct-drive automobile EPS device comprises a motor and is characterized in that an assembly output shaft passes through the center of the motor; one end of the output shaft is connected with an assembly input shaft through a torque rod, and the other end of the output shaft is connected with a universal joint; the motor is also connected with an EPS control module through conducting wires and a plug; and the EPS control module is the control module of the electric power steering system of the automobile steering gear. The invention is mainly used as the automobile electric power steering device.

Description

technical field [0001] The invention relates to a power steering device, more specifically, relates to a motor direct drive electric power steering device for automobiles. Background technique [0002] The existing automobile steering gear electric power steering system (abbreviated as EPS) adopts a DC motor to drive the worm, the worm drives the worm gear, and the worm gear drives the output shaft of the assembly (the worm gear and the output shaft are connected as one), and its disadvantages are: 1. The connection between the DC motor shaft and the worm is the way of matching the inner spline and the outer spline. Since the motor and the worm are produced by different manufacturers, due to the limitation of the equipment and technology level of each manufacturer, both the inner spline and the outer spline exist. The precision is not high, so the spline fit between the motor shaft and the worm is loose or tight. When the fit between the splines is loose, the EPS assembly of...

AI Technical Summary

Problems solved by technology

[0002] The existing automobile steering gear electric power steering system (abbreviated as EPS) adopts a DC motor to drive the worm, the worm drives the worm gear, and the worm gear drives the output shaft of the assembly (the worm gear and the output shaft are connected as one), and its disadvantages are: 1. The connection between the DC motor shaft and the worm is the way of matching the inner spline and the outer spline. Since the motor and the worm are produced by different manufacturers, due to the limitation of the equipment and technology level of each manufacturer, both the inner spline and the outer spline exist. The precision is not high, so the spline fit between the motor shaft and the worm is loose or tight. When the fit between the splines is loose, the EPS assembly often makes a "click" sound when turning the steering wheel.

2. Due to the worm gear reduction device, during the process of returning the steering wheel, the rotation of the motor will be reflected as a large load on the output shaft, which hinders the returning of the steering wheel

Therefore, the return effect of this EPS assembly is not ideal

3. Due to the low transmission efficiency of the worm gear, the efficiency of the motor is relatively low

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