Y type planetary gearing
US4850247A · kind A · utility
Inventor
Key dates
| Filing date | Jan 5, 1987 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Jan 5, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S475/904
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A Y type planetary gearing consists basically of three central gears, a sun gear and two ring gears, and a number of identical planet gears. The three central gears have a common central axis and a number of teeth different from each other. Each planet gear has a uniform tooth profile in the longitudinal direction. The Y type planetary gearing of this invention has three important characteristics: (1) each planet gear is able to mesh simultaneously with the three central gears, (2) each pair of gears satisfy the law of conjugate gear-tooth action to provide uniform rotary motion, and (3) the planet gears are able to work properly without a carrier. Consequently, the disclosed Y type planetary gearing is compact in structure, small in size, low in cost, and capable of providing a high speed ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.