Brian P Barker

US Patent:

49342517, Jun 19, 1990

Filed:

Dec 16, 1988

Appl. No.:

7/285849

Inventors:

Brian P. Barker - Ventura CA

Assignee:

Allied-Signal Inc. - Morris Township, Morris County NJ

International Classification:

F01B 1304

US Classification:

91486

Abstract:

A hydraulic axial piston motor or pump (8) of the type in which a rotor (10) has an odd-numbered plurality of cylinder ports (30) with which the arcuate ports (40,42) of a port plate (36) successively register. The port plate (36) is provided with fluid exchange ports (44,46) through which cylinders (16) communicate with a hydraulic capacitance system (81,82,84,86,93). The capacitance system (81,82,84,86,93) urges fluid into each cylinder (16) of the rotor (10) through an exchange port (44) after the associated cylinder port (30) has departed from registration with one arcuate port (40) but before the associated piston (14) has reached its bottom-dead-center position (72), and receives fluid from each cylinder through an exchange port (46) after the associated piston has begun its compression stroke but before the cylinder port has begun to register with a second arcuate port (42). Urging fluid into each cylinder eliminates cavitation effects that would otherwise result from having too large a decompression zone (68- 67), while receiving fluid from each cylinder prevents excessive pressurization that would otherwise result from having too large a precompression zone (67). The invention thus enables the use of arcuate ports (40,42) which subtend the more limited angular ranges required to provide a pump or motor that operates with a constant number of high-pressure cylinders and, consequently, with a constant clamping force between the rotor (10) and the port plate (36).

US Patent:

53256697, Jul 5, 1994

Filed:

Jul 22, 1992

Appl. No.:

7/918467

Inventors:

Brian P. Barker - Ventura CA
James L. Coakley - Fillmore CA

Assignee:

Pneumo Abex Corporation - Oxnard CA

International Classification:

F16D 3102

US Classification:

60428

Abstract:

A low breakout power transfer unit for transferring power between first and second hydraulic systems includes first and second pump/motor units to allow fluid flow between the first and second pump/motor units and the first and second hydraulic systems, respectively. The transfer unit includes a detection device for sensing fluid flow demand in the hydraulic systems and values for automatically isolating the pump/motor units from the hydraulic systems when the detection means senses substantially no fluid flow demands in a hydraulic system. The transfer unit includes a bypass device for each pump/motor unit for recirculating pumped fluid in excess of fluid flow demand.