Power plants – Pressure fluid source and motor – Servo-motor having externally operated control valve sets...
Patent
1998-01-21
2000-09-19
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Servo-motor having externally operated control valve sets...
60443, 91376R, F16D 3102, F15B 910
Patent
active
061194565
ABSTRACT:
A displacement control device for a hydraulic unit includes: an actuator for applying operator input force to a movable member for varying displacement of the unit; a control valve having a spool and a sleeve displaceable with respect to each other, one of these being coupled with the movable member and the other being coupled with the actuator, the control valve being capable of generating a control signal based upon the relative displacement of the spool and sleeve; a servo which is operatively connected to the movable member and receives the control signal so as to move the movable member and change the fluid displacement of the unit in response to the control signal; and a bias coupling connecting the spool and the sleeve of the control valve. Thus, a preload force is interposed between and the spool and the sleeve such that relative displacement between the spool and the sleeve takes place when the feedback force exceeds the preload force. Thus, the sleeve moves synchronously with the spool until the feedback force exceeds the preload force. Thereafter, the spool and sleeve move relative to each other so as to generate the control signal to the servo and supplement the operator input force in moving the movable member and thereby varying the fluid displacement of the unit.
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Sauer-Sunstrand, Series 40 Axial Piston Pumps Technical Information, Bulletin BLN-9989 Rev. C, Apr. 1997.
Sauer-Sundstrand, Series 40 M46-Axial Piston Pumps and Motors Service Parts Manual, Bulletin BLN-2-41650 Rev. A, Jul. 1990.
Sauer-Sundstrand, Series 20 Axial Piston Pumps and Motors Technical Information, Bulletin BLN-9565 Rev. O, Feb. 1990.
Lingenfelter Gary R.
Louis Joseph E.
Lopez F. Daniel
Sauer Inc.
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