F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
F15B 15/24 (2006.01) F15B 11/15 (2006.01) F15B 15/04 (2006.01) F15B 15/28 (2006.01) F15B 21/08 (2006.01)
Patent
CA 2476032
A hydraulic drive system comprises a hydraulic actuator comprising a piston that is reciprocable between two cylinder heads for actuating a machine. A flow switching device reverses the direction of hydraulic fluid flow to and from chambers on opposite sides of the piston. The piston stops at the end of each piston stroke when a shuttle valve associated with the piston opens to allow hydraulic fluid to flow between the piston chambers cancelling the differential pressure that acts on the piston to cause reciprocal movement. In preferred embodiments, a controller is programmed to determine when the piston has reached the end of each piston stroke based upon at least one of hydraulic pump speed, hydraulic fluid pressure, or elapsed time, with each of these measured during each piston stroke. When the controller determines that the piston has reached the end of a piston stroke, it sends an electronic signal to command the flow switching device to reverse the direction of hydraulic fluid flow.
Brook Thomas
Harper Greg
Noble Stephen
Gowling Lafleur Henderson Llp
Westport Power Inc.
Westport Research Inc.
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