Fuel injection pump
US5478213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1994 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Mar 7, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/36
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection pumping apparatus has a cam (9) actuated reciprocable plunger (13) housed in a bore (11) into which fuel flows from a fuel supply (7,14). An outlet (12) extends from a pumping chamber (13A) defined by the plunger and bore. A spill passage (19) communicates the pumping chamber with a spill valve (16) so that fuel from the pumping chamber which flows through the passage and spill valve (20) flows into a cylinder (21) containing a resiliently biased piston (17). The fuel which flows into the cylinder is returned to the pumping chamber during outward movement of the plunger and the fuel supply (14,7) ensures that the pumping chamber is completely filled with fuel. A safety valve (30,31) allows fuel to escape from the cylinder (21) in the event that the piston (17) sticks in the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.