Ball screw mechanism and steering system
US10246122B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2017 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | May 29, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H25/24
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball screw mechanism that allows a reduction in contact and friction between a retainer and a nut is provided. In a ball screw mechanism, a nut is threadedly engaged with a screw groove of a rack shaft through balls retained in a retainer groove of a retainer, and an axial force is applied to the rack shaft in accordance with rotation of the nut. The nut includes a uniform diameter portion having a uniform inside diameter and enlarged diameter portions each having an inside diameter larger than that of the uniform diameter portion. The enlarged diameter portions are provided at opposite axial ends of a region on an inner circumferential surface of the nut. The region faces the retainer groove and retainer ends adjoining to opposite axial ends of the retainer groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.