Pumps – Diverse pumps – Including rotary nonexpansible chamber type
Patent
1987-09-28
1988-12-27
Freeh, William L.
Pumps
Diverse pumps
Including rotary nonexpansible chamber type
417222, 92 122, F04B 2310, F04B 2314, F04B 128
Patent
active
047937742
ABSTRACT:
A variable displacement piston pump (10) including a plurality of axially aligned pumping cylinders (24) with a drive shaft (40) extending there between having a tiltable swash plate (30) disposed in a relatively dry cavity at one end of the drive shaft (40) for operating the pumping cylinders, and a reaction thrust plate (38) on the other end of the drive shaft (40), for providing reaction force in the drive shaft (40) opposite that provided by the swash plate (30). An inlet shaft seal (72) prevents fluid, which enters the pump at the inlet port (12), from filling the mounting housing (17) and submerging the mount shaft (44) portion of rotating assembly (16) and its supported swash plate (30). Two needle roller bearings (67) support the swash plate (30) and transmit torque from the drive coupling (19) to the swash plate (30). A high pressure fluid restrictor (70) meters hydraulic control fluid to the two needle bearings (67 ).
REFERENCES:
patent: 2620733 (1952-12-01), Overbeke
patent: 3058297 (1962-10-01), Tolley
patent: 3183844 (1965-05-01), Pitt et al.
patent: 3498227 (1970-03-01), Kita
patent: 3873240 (1975-03-01), Leduc et al.
patent: 4072444 (1978-02-01), Kaiser
patent: 4149830 (1979-04-01), Woodruff
patent: 4174191 (1979-11-01), Roberts
patent: 4281971 (1981-08-01), Kouns
patent: 4710107 (1987-12-01), Kanies
Bradt Howard J.
Croke Steven B.
Allied-Signal Inc.
Freeh William L.
Massung Howard G.
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