Recirculating ball power steering system
US8360197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2011 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | May 2, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0454
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A power steering system includes an input shaft operatively connected to an input member, and a sector gear operatively connected to a pitman arm. A first ball screw is formed on the input shaft. A first ball nut circumscribes the first ball screw and is in torque-transfer communication therewith through a plurality of ball bearings. A first rack is rigidly attached to the first ball nut, and is meshed with the sector gear for torque transfer therewith. A second ball screw is not substantially coaxial with the first ball screw. A second ball nut circumscribes the second ball screw and is in torque-transfer communication with the second ball screw through the ball bearings. A second rack is meshed with the sector gear for torque transfer therewith. An electric motor is configured to selectively supply torque to the sector gear through the second ball screw.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.