Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1998-12-01
2000-12-19
Leung, Philip H.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
417218, 4172222, F04B 126
Patent
active
061620246
ABSTRACT:
A preferred constant horsepower, variable volume hydraulic pump (10) includes a wobble plate (22) coupled with interior end of the pump drive shaft (18) configured for sequentially stroking a plurality of pistons (28,30) received in respective cylinders (42,44) included as part of a nonrotatable barrel (24). A shifting mechanism (74) axially shifts the barrel (24) in accordance with the output pressure in order to change the stroke length of the pistons (28,30) in the cylinders (42,44) and thereby change the flow rate through the pump (10). The shifting mechanism (74) is configured to lower the flow rate as the output pressure increases in order to maintain a constant horsepower demand for maximizing the flow volume for a given horsepower.
REFERENCES:
patent: 3657970 (1972-04-01), Kobayashi et al.
patent: 3712758 (1973-01-01), Lech et al.
Campbell Thor
Leung Philip H.
SPX Corporation
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