Fuel pump and fuel feeding device using the fuel pump
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 20, 2004
Grant Date -
Feb 13, 2003
app pub date -
Sep 9, 2002
filing date -
Mar 14, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fuel injection pump includes a plurality of plungers and a cam shaft having a plurality of drive cams (31, 32) corresponding to the plungers. The cam shaft is rotated by a power from the outside so as to reciprocate the plurality of plungers by the corresponding drive cams, and fuel is pressurized and force-fed in the forward stroke of each plunger. All or a part of the drive cams (31, 32) are installed with the phase thereof shifted, and the cam lobes (31a, 32a) of the drive cams are formed asymmetrical so that the amount of displacement of the plungers relative to a unit cam rotating angle is reduced in the forward stroke more than in the backward stroke of the plunger. Thus, the pressure variation in a common rail is reduced, the pressure resistance of the entire system is lowered, and the drive torque is reduced so as to reduce the load and noise of a drive system.
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