External circulation ball screw
US10663042B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2018 |
| Grant date | May 26, 2020 |
| Priority date | — |
| Expiry date | Jul 20, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H25/2223
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An external circulation ball screw consisting of a screw shaft, a screw nut, a cover, two reflow members and multiple rolling members is disclosed. The screw nut defines a mounting groove on the outer perimeter and two return holes in the mounting groove. A first half-return channel on a first step in the mounting groove of the screw nut and a second half-return channel in a second step inside the cover constitute a return channel. Alternatively, a third step can be formed in the cover, or the screw nut can be configured to provide a mounting groove and a third step with return holes in the mounting groove. Thus, same size of reflow members can be used with different lengths of return channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.