Method for gradually relieving pressure in a hydraulic system utilizing reverse fluid flow through a pump of the system
US8001751B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2007 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Dec 20, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D75/20
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of gradually relieving pressure in a hydraulic system of a work machine, wherein a pump in fluid communication with the hydraulic system and a fluid reservoir, is operable for pressurizing fluid from the reservoir and pumping the pressurized fluid into the hydraulic system, wherein the pump is restrictive to fluid flow therethrough when not operating, and the hydraulic system includes at least one valve in fluid communication with the work element configured for receiving the pressurized fluid. The valve is controllably operable in at least two operating modes, including a first mode wherein the pressurized fluid can pass therethrough between the pump and the work element or elements, and a second mode wherein the fluid is prevented from passing between the pump and the work element. The method includes operating the valve or valves in the first mode for at least a predetermined time period while the pump is not operating, to allow at least some of any of the pressurized fluid in the work element to flow through the hydraulic system and gradually drain through the pump to the reservoir so as to reduce any pressure in the hydraulic system and the work element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.