Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1979-02-15
1981-09-01
Smith, Leonard E.
Pumps
Expansible chamber type
Pumping member position controlled port
417499, F02M 5944
Patent
active
042869315
ABSTRACT:
Cylindrical sleeve having a top portion of enlarged diameter which includes a control bore and which is clamped by an annular screw against a shoulder of a reception bore in the pump housing. An annular screw has, in a widened bore portion at least partially surrounding the top portion of the cylindrical sleeve, a pressure shoulder which is recessed relative to the end face of the annular screw presented to the suction chamber and which transmits the clamping force to the cylindrical sleeve. In a further refinement, the annular screw is provided with an annular extension which surrounds the cylindrical sleeve at a distance therefrom in the region of the control bore and whose inner wall forms a protection against impingement of the jet of fuel emerging from the control bore upon the termination of fuel delivery. A widened portion of the bore for receiving the valve member of the pressure valve is disposed in a second portion of the delivery bore which branches laterally, preferably at right angles, from a first portion of the delivery bore which extends coaxially of the longitudinal axis of the pump cylinder, and a screw plug is screwed into an extension of the said first portion. After the screw plug has been removed, the measuring sensor of a pre-stroke measuring device can be mounted onto the pump piston through the first portion of the delivery bore, and thus the dimension of the pre-stroke can be determined.
REFERENCES:
patent: 1757736 (1930-05-01), Pritchard
patent: 2160978 (1939-06-01), Mock
patent: 2545664 (1951-03-01), Johnson
patent: 3311062 (1967-03-01), Knapp et al.
patent: 3368491 (1968-02-01), Shook et al.
patent: 3759637 (1973-09-01), Vuaille
patent: 3989022 (1976-11-01), Pfister
Hafele Walter
Schenk Bernhard
Greigg Edwin E.
Robert & Bosch GmbH
Smith Leonard E.
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