US 5,603,303 AGranted

High pressure fuel supply pump

AssigneeNippondenso Co., Ltd.

InventorsMasahiro Okajima, Kazuo Yamamoto, Hiroshi Inoue, Masaaki Katou, Hiroyuki Kano

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Abstract

A high pressure fuel supply pump comprises a cylinder, the upper part of which is exposed to the outside of a head cover that is a part of the engine housing, and is fixed to the head cover by means of bolts, not shown. The remaining portion of the high pressure fuel supply pump is received in an accommodation hole of the head cover. A pump cam 111 is mounted to a valve camshaft for driving a suction/exhaust valve and drives the high pressure fuel supply pump. The use of an exclusive shaft for pump driving only, a bearing member therefor, and the like is rendered unnecessary, which enables a reduction in the number of parts employed. Further, since the timing with which the pressurized fuel is discharged is controlled through the operation of a solenoid valve, the precision with which fuel injection is controlled is improved.

Claims16

Dependent claims

An internal combustion engine with a high pressure fuel supply pump, said engine comprising:

a housing of said engine, said housing having an accommodation hole;
and
an injector disposed on said housing for feeding fuel into a combustion chamber;
said engine having a camshaft;
and a common rail for feeding high pressure fuel to said injector;
said common rail located adjacent to said injector;
said fuel pump being disposed in said accommodation hole and comprising
a plunger movable reciprocally;
a first supporting member having an intake passage and a discharge passage for fuel, and having an inner wall forming a slide hole in which said plunger is reciprocally and slidably supported, said discharge passage communicating with said common rail and said fuel pump;
a pump cam for driving said plunger to enable reciprocal movement;
an urging means for urging said plunger to enable reciprocal movement;
a solenoid valve provided at one end of said slide hole for determining discharge timing of the fuel pressurized by the reciprocating movement of the said plunger,
wherein said common rail is disposed to be adjacent to said fuel pump and said discharge passage for feeding the high pressure fuel to said injector so that the length of said discharge passage is shortened and pulsation of the high pressure fuel discharged from said fuel pump is previously damped.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/533,913Filed 26 Sep 1995 · continuation
Priority: JP 6-9110628 Apr 1994
Granted: 18 Feb 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F02M 59/366
By variably-timed valves controlling fuel passages to pumping elements or overflow passages: valves being actuated electrically
F01L 1/053
Camshafts: overhead type
F02M 39/02
Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements: arrangements of fuel-injection…
F02M 63/0225
Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector;…:…