Hydraulic pump
US5992296A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Dec 18, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B43/084
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a hydraulic pump, an elastic sealing member for performing sealing between a cylinder and a slide piston reciprocating in the cylinder is provided in the front end side of the slide piston and along the inner circumferential surface of the cylinder so that the elastic sealing member receives a compression force from a front end surface of the slide piston in a compression stroke of the slide piston and swells into a pump chamber because of elastic deformation due to the compression force to thereby reduce the volume of the pump chamber. Accordingly, the elastic deformation of the elastic sealing member in the compression stroke is used to increase the discharge quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.