Valve for a hydraulic drive apparatus
US6968684B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2003 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Dec 10, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Y2200/223
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved valve for use in a hydrostatic drive apparatus for a vehicle such as a zero turn vehicle. For each hydraulic drive system in the vehicle, a valve is located between the high and low pressure sides of the closed hydraulic circuit connecting the hydraulic pump and motor. The valve opens when the pressure rise rate in the high pressure side reaches a set level to minimize pressure spikes in the high pressure side and thus improve performance of the vehicle. A valve block may be used to mount the valve, and a second valve may also be included therein to connect the two pressure sides of the hydraulic circuit in a similar manner when the vehicle is operated in reverse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.