Ball spline
US8141448B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2008 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Feb 23, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19744
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
First shoulder portions are formed on the outer periphery of the shaft such that the first spline grooves are interposed between the first shoulder portions adjacent to each other in a circumferential direction of the shaft. Second shoulder portions are formed on the inner periphery of the outer tube such that the second spline grooves are interposed between the second shoulder portions adjacent to each other in a circumferential direction of the outer tube. Main passages of spline-purpose ball circulation passages are formed with the first and second shoulder portions. Clearance are formed respectively between the first and second shoulder portions and the spline-purpose balls in a rotational direction of the screw shaft and the spline-purpose outer tube. The spline-purpose balls disposed in the main passages bear a clockwise torque and a counterclockwise torque transmitted between the screw shaft and the spline-purpose outer tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.