Electromechanical servo steering system having a spring-loaded bearing arrangement

Abstract

The invention relates to an electromechanical servo steering system having an electric servomotor with a motor shaft, which drives a shaft (10) meshing with a helical gear (12), wherein the shaft (10)is arranged in a gearbox (14) and the end of the shaft in the vicinity of the motor is mounted in a bearing arrangement (13) so as to be rotatable about an axis of rotation (100), and said shaft is mounted in the gearbox (14) so as to be pivotable about a pivot axis (22) lying perpendicular to the axis of rotation (100), and at least one spring element (23) is provided which axially pre-stressesa bearing element (19), which is pivotable together with the shaft (10) about the pivot axis (22), of the bearing arrangement (13) spring elastically against a bearing element (21), which is arrangedin a fixed position in the gearbox (14), of the bearing arrangement (13), wherein precisely two spring elements (23) are provided which are arranged opposite each other in the circumferential direction of the bearing arrangement (13).

Description

technical field [0001] The invention relates to an electromechanical servo steering system having the features of the preamble of claim 1 . Background technique [0002] In an electromechanical servo steering system, an electric motor generates a torque which is transmitted to a transmission and superimposed in the transmission with a steering torque provided by the driver. [0003] A typical electromechanical servo steering system includes an electric servo motor that will drive a worm shaft that engages a worm gear disposed on the steering shaft, wherein the worm gear is operatively connected to the input shaft of the steering transmission, and wherein , the worm shaft and the steering shaft are rotatably installed in the combined transmission housing. The worm shaft is connected to the motor shaft of the electric servo motor via a coupling. [0004] DE 10 2008 001 878 A1 discloses a pivot bearing for a worm gear drive, wherein the worm wheel is mounted by means of a car...

AI Technical Summary

Problems solved by technology

This configuration has been shown to be disadvantageous because the coupling is subjected to greater loads, as a result of which the coupling wears out more quickly over time and increases the tooth flank clearance with corresponding vibration noises

[0005] Furthermore, it is known to construct bearings with a large amount of play so that the required pivotability is possible

However, the problem with this approach is that differential thermal expansion occurs due to large component tolerances

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