Fuel injector pump for a unit fuel injector
US4054248A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M57/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A jerk-type fuel injector - pump unit is provided with a two-stage plunger rotatably and reciprocably journaled in the cylinders of a two-stage bushing to provide therewith a primary chamber for pumping fuel for injection and a secondary chamber for pumping fuel, with an annular fuel chamber encircling the bushing, the bushing having conventional upper and lower main fill and bypass ports in communication with the primary chamber as controlled by the first stage of the two-stage plunger with each port sequentially closable and operable by spaced helical lands on the first stage of the plunger to effect beginning and ending of injection during the pumping stroke of the plunger to discharge fuel through an outlet at the lower end of the bushing for injection into the cylinder of an engine, the bushing further having secondary port means and a lower flow control passage means, each opening at one end into said secondary chamber with flow therethrough controlled by the second stage of the plunger, the second stage of the plunger being of a larger external diameter than the diameter of the first stage and sized relative thereto so that the cross-sectional working area of the primary cha…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.