Electric power steering apparatus
US7025169B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 2005 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | May 10, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19744
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An electric power steering apparatus comprises a ball nut rotationally driven by an electric motor through a gear train and having a female thread groove formed in the inner periphery thereof, a rack shaft disposed through the ball nut on the axis thereof and having a male thread groove so formed in its outer periphery as to face to the female thread groove, a ball screw mechanism having a number of circulation balls interposed between the female thread groove and the male thread groove, and a housing for holding the ball nut rotatably through the bearing. An elastic member is interposed between the housing and the ball nut in order to permit the ball nut to make a predetermined displacement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.