Ball screw actuator
US4590816A · kind A · utility
Inventor
Key dates
| Filing date | Jan 30, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Jan 30, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19781
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid-powered differential ball screw actuator with torque-transmitting helical ball-carrying races. The actuator includes a body with an interior first ball race and first and second ends; a first stop stationary with respect to the body for engaging and limiting travel of balls along the first ball race toward the first end; and output shaft rotatably supported within the body and having an exterior second ball race; a second stop stationary with respect to the shaft for engaging and limiting travel of balls along the second ball race toward the first end; and a piston reciprocally mounted within the body for application of fluid pressure to produce movement of the piston toward the first or second end. The piston has a sleeve coaxially receiving the shaft, with a third ball race cvonfronting and corresponding to the first ball race to form an outer set of races and a fourth ball race confronting and corresponding to the second ball race to form an inner set of races. The third and fourth ball races extend over a sufficient axial length of the sleeve projecting beyond the first and second stops, respectively, toward the first end, as measured with the piston positioned at its e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.