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High pressure fuel supply pump
| Details |
Inventors: Okajima, Masahiro; Yamamoto, Kazuo; Inoue, Hiroshi; Katou, Masaaki; Kano, Hiroyuki;
Assignee: Nippondenso Co., Ltd. (Kariya, JP)
Primary Examiner: Moulis; Thomas N.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman IP Group of Pillsbury Madison & Sutro LLP
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. |
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DETAILED DESCRIPTION The present invention was conceived in order to solve the above-mentioned problem, the object thereof being to provide a high pressure fuel supply pump which is compact and in which the fuel-discharging timing can be controlled with high precision.
In one preferred mode of the present invention, a high pressure fuel supply pump connected to a valve camshaft of an internal combustion engine having a housing at which an accommodation hole is formed, said fuel pump disposed in the accommodation hole, has a plunger moving 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 the plunger is reciprocally and slidably supported; a pump cam driving the plunger to enable reciprocal movement; an urging means for urging the plunger toward the side of the pump cam; and a solenoid valve provided at one end of the slide hole for determining discharge timing of the fuel pressurized by the reciprocating movement of the plunger.
In other preferred mode of the present invention, a high pressure fuel supply pump further has an end face of the plunger, the inner wall of the first supporting member, and an end face of the solenoid valve, the fuel is introduced from the intake passage into the fuel pressurization chamber and pressurized by the reciprocating movement of the plunger.
The high pressure fuel supply pump is accommodated in the housing of the engine and the plunger is driven by the pump cam mounted on the valve camshaft, whereby a camshaft exclusively used for driving the high pressure fuel supply pump becomes unnecessary.
This results in the advantages that the mass of the portion of the high pressure fuel supply pump that is exposed to the exterior of the engine housing is reduced, thereby increasing the degree of freedom with which the loading space thereof can be utilized.
In addition, the number of the parts used is decreased and consequently, as a result of the high pressure fuel supply pump being easily fabricated, the number of manufacturing process steps decreases and the manufacturing cost can be advantageously reduced
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Cooking 
