Piston pump
US6146115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1999 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Jul 28, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/126
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A piston pump which is intended particularly for use in a slip-controlled hydraulic vehicle brake system. To increase a pumping volume of the piston pump at low pumping pressure, the piston pump includes a body embodied preferably as an annular body which is attached axially displaceably to the piston. The body increases a cross- sectional area of the piston and is axially acted upon by a spring element. At low pressure, the piston pump pumps with the entire cross-sectional area of the piston and the body while conversely at a higher pumping pressure, the body is held back counter to the force of the spring element and does not move together with the piston so that then the piston pumps only with its own cross-sectional area. The piston pump of the invention has the advantage of improved pressure buildup dynamics when the pumping pressure at the onset of pumping is low.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.