Remote control modification for manually controlled...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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Details

138/74.11

F15B 11/00 (2006.01) B62D 5/09 (2006.01) F01B 25/02 (2006.01)

Patent

CA 2019542

A remote control modification (11) for a hydraulic steering system (13) of the type used to steer underground loaders and the like is disclosed. The remote control modification comprises a bidirectional, spring-loaded remote control valve (51) connected in parallel with the bidirectional, spring-loaded control valve (19) that normally responds to steering inputs created by the manual movement of a steering arm (25). The remote control valve (51) has outlet ports (75 and 77) that are smaller than the outlet ports (39 and 41) of the manual control valve (19). Movement of the piston of the remote control valve (51) is controlled by a slave hydraulic actuator (53). The flow of hydraulic fluid to the slave hydraulic actuator (53) is controlled by a solenoid-actuated valve (59). The solenoid (61) of the solenoid-operated valve (59), in turn, is controlled by a receiver (63) that responds to radio frequency control signals (105) generated by a remotely located transmitter (65). Located in the hydraulic lines between the solenoid-operated valve (59) and the slave hydraulic actuator (53) are restrictor/reverse bypass pressure relief valve combinations (55 and 57). Finally, preferably, the hydraulic line running to the larger capacity chamber of the slave hydraulic actuator (53), i.e., the non-shaft chamber, is coupled to the hydraulic return tank via a relief line that contains a manually adjustable restrictor valve (67).

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