Distributor-type fuel injection pump having injection rate control function for internal combustion engines
This patent describes a distributor-type fuel injection pump for an internal combustion engine having a plurality of cylinders and a plurality of fuel injection valves for injecting fuel into respective ones of the cylinders. The fuel injection pump includes a plunger arranged for concurrent reciprocating and rotative motion in response to rotation of the engine to perform pressure delivery and distribution of fuel into the cylinders of the engine. The plunger has a first portion and a second portion having different diameters from each other, a first pump working chamber defined by the first portion, and a second pump working chamber defined by the second portion. Fuel delivery passageways are arranged for communication with the first pump working chamber and lead to respective ones of the fuel injection valves of the engine. A communication passageway is arranged for communicating the second pump working chamber with the fuel delivery passageways and a drain passageway is arranged for communicating the communication passageway with a zone under a lower pressure of the pump.
- Assignee:
- Diesel Kiki Co. Ltd., Tokyo
- Patent Number(s):
- US 4655183
- OSTI ID:
- 6635838
- Resource Relation:
- Patent File Date: Filed date 12 Sep 1985
- Country of Publication:
- United States
- Language:
- English
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