Electric Actuator
US5554899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1994 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Apr 7, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2025/2075
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An electric actuator which is used for e.g. an arm of an industrial robot includes a composite shaft having a ball screw groove and a ball spline groove, a hollow motor through which the composite shaft extends, a ball screw nut fitted threadedly about the composite shaft and secured to a motor shaft, and a ball spline nut fitted about the composite shaft and secured to a motor housing. The ball spline nut, ball screw nut, and motor are arranged in the order mentioned as viewed from an attachment for a moving body which is provided at one end of the composite shaft. An angular-contact bearing which supports the motor shaft rotatably is situated closer to the ball screw nut than the motor is.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.