Ball screw device and steering system
US10502296B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2017 |
| Grant date | Dec 10, 2019 |
| Priority date | — |
| Expiry date | Apr 18, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H25/2204
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A cylindrical retainer configured to retain balls in a rollable manner is provided inside a ball screw nut. The retainer has retainer grooves each having a shape of an elongated hole that extends in an axial direction of a ball screw shaft so as to be inclined at a predetermined angle. A first end of the ball screw nut and a first end of the retainer, which is one of two ends of the retainer that is closer to the first end of the ball screw nut, are spaced away from each other by a distance. The terminal end of the retainer groove closest to the second end of the retainer and a ball that is closest to the second end of the ball screw nut are spaced away from each other by a distance. The distance is set equal to or larger than the distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.