Hydrostatic pump and motor unit
US5497623A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1995 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jan 18, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2186
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved hydrostatic transmission which is compact, reliable and economical to manufacture, including a novel apparatus for reducing the speed of the input to the transaxle using both hydraulics and mechanical gearing; an improved differential which is stronger and less complicated than prior art designs; a more effective and efficient apparatus for braking the transaxle, an improved apparatus for hydraulically bypassing the hydrostatic transmission and a unique check valve arrangement for maintaining oil pressure within the hydrostatic transmission. Also, an apparatus is provided for diverting the hydraulic fluid to a sump by lifting a cylinder block from a running surface of the hydrostatic transmission to quickly drain the fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.