Radial piston pump
US6280162A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1999 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Jun 2, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/1075
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump includes a pump housing with a bore, an inlet and an outlet, a piston movable in the bore, and an inlet valve and an outlet valve which are formed by a cup seal. The piston has a portion of a large diameter and a portion of a small diameter, each of the portions extending through one of the cup seals, whereby a pump chamber is provided between the cup seals. In a first embodiment, the cup seal encompassing the large diameter is the inlet valve and the cup seal encompassing the small diameter is the outlet valve, and the cup seals are arranged in an annular radial groove provided in the bore. In another embodiment, the cup seal encompassing the large diameter is the outlet valve and the cup seal encompassing the small diameter is the inlet valve. Here the cup seals are arranged in an annular radial groove provided on the piston. For noise reduction purposes, the piston is tapered from the large diameter toward the small diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.