Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1992-09-21
1993-07-27
Bertsch, Richard A.
Pumps
Expansible chamber type
Pumping member position controlled port
92153, F04B 704, F04B 3902
Patent
active
052306151
ABSTRACT:
A fuel injection pump for injecting compressed fuel to an engine through a reciprocative motion of a plunger includes a vertically-elongated plunger barrel, and a plunger having a shaft portion which is vertically and reciprocatively slidable along the inner space of the plunger barrel, at least one of the inner wall of the plunger barrel and the peripheral surface of the shaft portion of the plunger being formed with an oil groove for temporarily storing oil which ascends from a cam chamber through a reciprocative motion of the plunger, wherein the oil groove has at least two side walls one at the upper side of the oil groove and one at the lower side of the oil groove, and wherein lower side wall is downwardly slanted to return the stored oil to the cam chamber.
REFERENCES:
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patent: 1846282 (1932-02-01), Summers
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patent: 2333698 (1943-11-01), Bremser
patent: 2398798 (1946-04-01), Meyers
patent: 2791372 (1957-05-01), Abbatiello
patent: 3721163 (1973-03-01), Hill et al.
patent: 4067401 (1978-01-01), Schnell
patent: 4737086 (1988-04-01), Yamaguchi et al.
Nozaki Hiroaki
Unoki Ken
Yoshino Ryokiti
Bertsch Richard A.
McAndrews Roland
Zexel Corporation
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