Ball screw
US6439072B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1999 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | May 19, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18648
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball nut 30 has a dowel 60 for circulating balls 50. A cage type retainer 40 is disposed between a screw shaft 20 and the ball nut 30 which engages with the screw shaft 20 through the ball 50. The retainer 40 is provided with a plurality of elongated holes 42 at a peripheral surface thereof to extend to an axial direction thereof so as to separate the balls 50 from one another in a peripheral direction thereof and to hold the balls therein to be free to roll. The distance of a space between the screw shaft 20 and the cage type retainer 40 is set to be smaller than that of a space between the dowel 60 and the cage type retainer 40 n the radial direction of the screw shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.