Electrically-operated power steering apparatus
US5685390A · kind A · utility
26Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1995 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Mar 10, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19781
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electrically-operated power steering apparatus comprises a steering shaft, a rack shaft capable of linear movement for turning a steering running wheel a, rack-pinion gear for coupling the steering shaft with the rack shaft, and a ball screw mechanism including a screw groove formed on the rack shaft, a rotary ball screw nut fitted on the rack shaft, and plural balls positioned in a rolling path. The plural balls are comprised of bulbs of a larger diameter and balls of a smaller diameter, which are alternately arranged, and the smaller diameter is within a defined range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.