Compact planetary drive transmission providing one-to-one drive ratio in either direction
US3954028A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1973 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Nov 5, 1993 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H3/663
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A compact low inertia planetary gearing system for use in tandem with a multispeed range transmission provides for transmitting drive to the range transmission in either a forward or a reverse direction with a one-to-one drive ratio in either direction. The drive direction determining gearing system includes input and output gears having an equal number of teeth but which are of differing diameter and thus have teeth of differing pitch. Planet gears which are compound pinion gears each have a first set of teeth engaging the larger diameter one of the input and output gears and each have a second set of teeth of reduced diameter which engage the other of the input and output gears through an idler gear, the teeth of the second set being equal in number to the teeth of the first set but being of finer pitch. A brake selectively locks the planet gear carrier against rotation to provide for drive in one direction while a clutch provides for locking up the several gears against relative rotation to provide for drive through the planetary gearing system in the opposite direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.