Pressure fluid supply and delivery apparatus
US6276133A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/76
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved pressure fluid supply and delivery apparatus is disclosed that has a pressure compensating function and yet a reduced loss in pressure. The apparatus includes a variable displacement hydraulic pump unit(10; 60, 61) having a plurality of fluid discharge ports(10a, 10b; 60a, 61a) independent each other and a common drive shaft. A plurality of fluid circuits (11, 12) are connected to the plural discharge ports (10a, 10b; 60a, 61a), respectively, and a plurality of fluid operated actuators (14, 16; 14, 14', 16, 16') are connected via respective operating valves (13, 15; 13, 13', 15, 15') to the plural fluid circuits (11, 12), respectively. Also included in the apparatus is a displacement control means (19, 20; 64, 64) operable in response to discharge pressures in the fluid discharge ports (10a, 10b; 60a. 61a) and load pressures in the actuators (14, 16; 14, 14', 16, 16') for controlling discharge fluid pressure of the variable displacement pump unit (10; 60, 61). A combining valve means (21) is disposed between the plural fluid circuits (11, 12), for blocking fluid communication between them when the plural fluid discharge ports (10a, 10b; 60a, 61a) have an equal pressure …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.