F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/41.11
F15B 21/02 (2006.01) F04B 49/00 (2006.01) F04B 49/06 (2006.01) F04B 49/08 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1084810
APPLICATION OF: Kenneth K. Knapp FOR: HYDRAULIC CONTROLLER A B S T R A C T An electro-hydraulic control for a hydrostatic trans- mission to control a number of functions of the transmission or the pump or motor of the transmission. The transmission includes a variable displacement pump driving a fixed displacement motor along with the appropriate standard valving for control of the displacement of the pump and the high and low pressure conduits communicating hydraulic fluid between the pump and the motor. An electro-hydraulic control valve is supplied to port a varying pressure of fluid to the standard controller used to vary the displacement of the pump. The control valve includes a spool biased in one direction in a housing to port fluid from the charge pump of the transmission to the standard controller. A fluid chamber is in communication with the other end of the spool and with the fluid from the charge pump. A variable orifice communi- cates the fluid chamber with a drain. The size of the orifice is controlled by an electrical force positioning valve which receives a signal representative of the location of the swashplate of the pump. Depending upon the pressure of the fluid in the fluid chamber the control valve will directly vary the pressure ported from the charge pump to the standard controller. A needle roller has one end in contact with the end of the spool communicating with the fluid chamber. A high pressure signal is provided via a shuttle valve across the high and low pressure conduits of the transmission to the other end of the needle roller. Accordingly, the control valve is responsive to both the pump displacement and the highest pressure within the transmission thereby making it a torque limiting controller. Various modifications can be made within the spirit of the invention to control the fluid pressure within the fluid chamber and against the one end of the needle roller to change the function of the control valve.
294638
Corporation Eaton
Macrae & Co.
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