Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1982-01-12
1983-11-29
Smith, Leonard E.
Pumps
Expansible chamber type
Pumping member position controlled port
417501, F04B 704
Patent
active
044178573
ABSTRACT:
A piston pump, for use for example for operating auxiliary mechanisms in motor vehicles, has a piston 1 which is reciprocated in a cylinder 2 by an eccentric 20 and a return spring 18. The cylinder 2 has an outlet valve 23, and inlet openings 4 in its side wall. Instead of moving the piston 1 so far downwards in the suction stroke of the pump that the piston head 6 L is below the inlet openings 4 to allow fluid to flow into the pump chamber 10, the piston is provided with a peripheral groove 13 and openings 11 in its side wall. The openings 11 lead to a recess 17 in the piston head and hence to the pump chamber 10. The groove 13 moves into communication with the inlet openings 4 at two separate times in each to and fro movement of the piston, that is in each pumping cycle, so that the fluid being pumped can only flow into the pump chamber from the inlet openings 4 during these two times. This arrangement provides a more accurate control of the pump output in dependence upon its speed than does the prior arrangement in which the pump chamber 10 is in direct communication with the inlet openings 4 when the piston is at bottom dead-center.
REFERENCES:
patent: 1651670 (1927-12-01), Carrey
patent: 1760171 (1930-05-01), Schoene
patent: 1901817 (1933-03-01), Neidl
patent: 2415618 (1947-02-01), West
patent: 2595738 (1952-05-01), Walker
patent: 2853229 (1958-09-01), Dolz
Pierburg GmbH & Co. KG
Smith Leonard E.
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