JPS61169772U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is an overall view of one embodiment of the present invention, FIG. 2 is a side view including a partial cross section showing details of the rack shaft components of the device shown in FIG. 1, and FIG. FIG. 3 is a cross-sectional view showing details of a threaded portion. [Explanation of symbols of main parts], 1...Handle, 5
...Pinion shaft, 7...Rack shaft, 8...Electric motor, 20
...housing, 30...second housing, 3...ball screw mechanism, 10...gear mechanism, 40...ball nut, 40a...screw groove, 41...ball, 7b...groove, 42...ball circulation path, 33, 34...ball bearing.

Claims (1)

[Claims for Utility Model Registration] 1. A pinion shaft that rotates together with the steering handle and has a pinion part, a rack part that meshes with the pinion part, and a ball screw part provided coaxially with the rack part. a rack shaft that has a shaft and moves in the axial direction;
a ball nut supported by a bearing within the housing and engaged with the ball screw portion via a ball;
In the power steering system for a vehicle, the ball nut is supported by two ball bearings whose outer circumferential surface forms part of a curved surface, and whose inner circumferential surface forms a part of the curved surface. An electric power steering device characterized in that the threaded groove provided in the screw groove has two turns or less in a portion where a ball rolls and has the ability to apply an external force. 2. The housing is divided into a first housing that holds the pinion shaft and the rack part of the rack shaft, and a separate second housing that holds the ball nut and the electric motor, and both the first and second housings are connected to form the housing. An electric power steering device according to claim 1 of the utility model registration form.