Pumps – Condition responsive control of pump drive motor – With plural separate drive motors for single pump unit
Patent
1998-11-12
2000-10-03
Thorpe, Timothy S.
Pumps
Condition responsive control of pump drive motor
With plural separate drive motors for single pump unit
417 441, 60431, F04B 4900, F04B 4906, F16D 3102
Patent
active
061264016
ABSTRACT:
A hybrid electric hydraulic drive system, having a first cylinder (75) having a left chamber (32) and a right chamber (34) separated by a piston (22). A second cylinder (76) has a single or sole chamber (74) for receiving hydraulic fluid with the second cylinder enclosing a second piston (78). The second cylinder is substantially equal in length to the first cylinder and is rigidly attached to the first cylinder. A pump (14) is fluidly connected to the left chamber (32) by a first fluid passage (16) and is fluidly connected to the right chamber (34) by a second fluid passage (18). A third fluid passage (80) is directly connected to the right chamber (34) and to the sole fluid chamber (74) of the second cylinder (76). A first rod (30) is connected to the piston (22) and a second rod (84) is connected to the second piston (78). The first and second rods are connected by a connecting element so the rods move in unison. The volume of the sole chamber (74) is equal to the volume of the first rod (30) with the total fluid capacity of the system remaining constant during operation. An encoder (36) is electrically connected to a controller (40) which is electrically connected to a servo electric motor (10) which drives the pump (14).
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Clarkson Douglas M.
Computer Graphics Systems Development Corporation
Gray Michael K.
Thorpe Timothy S.
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