Tandem fuel pump assembly for internal combustion engine
US5190444A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Aug 21, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B23/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A tandem fuel pump assembly for internal combustion engines includes a housing having a fixed spring retainer mounted thereinside which supports a diaphragm pump biassing spring thereabove to force a diaphragm defining the movable lower wall of a first pumping chamber to reduce the volume thereof and eject fuel from an outlet thereof preferably through a fuel filter to the inlet of a second piston pumping chamber. A second biassing spring supported below the spring retainer forces a pumping piston downwardly to reduce the volume of the second pumping chamber and thereby eject fuel therefrom to an engine fuel rail for injection into the engine therefrom. The diaphragm and piston are mechanically connected by a pump stem through a lost motion connection to accommodate differing pumping strokes of the two pumps, so that a single tappet actuated by the engine camshaft mechanically raises the piston to cause movement thereof to fill the second piston pump chamber while the biassing spring of the piston pump pulls the diaphragm through the stem against the action of its biasing spring to fill the first chamber during the pumping stroke of the piston pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.