Injection rate control cam
This patent describes a cam for controlling the injection rate of fuel in a fuel injection system of an engine. The fuel injection system including a cyclically operating unit injector having a body, an injector plunger mounted for reciprocating movement in the injector body between an advanced position and a retracted portion to pump into the engine during each cycle a variable quantity of fuel up to a maximum quantity under rated engine conditions, and a drive train for converting rotational movement of the cam into reciprocating movement of the pumping plunger depending on the profile of the cam. The cam profile comprises at least a plunger retraction segment and a plunger advancement segment for controlling the velocity if injector plunger retraction and advancement, respectively, the plunger advancement segment including a pre-injection subsequent shaped to cause an initial quantity of fuel to be injected into the engine during each cycle at rated engine conditions while the pre-injection subsegment is in contact with the drive train, and an injection subsegment following the pre-injection subsegment.
- Assignee:
- Cummins Engine Co., Inc., Columbus, IN (USA)
- Patent Number(s):
- US 4962743; A
- Application Number:
- PPN: US s 7-362266
- OSTI ID:
- 6451820
- Resource Relation:
- Patent File Date: 6 Jun 1989
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method for building or repairing rotary injection fuel pump piston cylinders
Fuel injection system for internal combustion engines