B - Operations – Transporting – 61 – H
Patent
B - Operations, Transporting
61
H
105/26
B61H 11/08 (2006.01) B61C 9/14 (2006.01)
Patent
CA 1199834
"ABSTRACT" RAIL VEHICLE" An adhesion drive rail vehicle comprises a prime mover 1, a hydrostatic transmission 24 to power at least one driven wheel or axle of the vehicle, and a control circuit 26 to control the transmission circuit 24; the transmission circuit 24 incorporating a hydraulic motor 10 provided at the or each driven wheel or axle, a variable output pump 21 biased to a drive condition, and at least one throttle valve 3A, 3B, to control vehicle braking, located in a fluid transmission line 23, 28, of the transmission circuit 24 extending from the pump 21 to the motor(s) 10 and being operable by a disproportional area actuator 2A, the control circuit incorporating control means 6 for the variable output pump 21 and at least one driver operated speed control device 14, 15, movable in a first mode to cause acceleration of the vehicle by sending a variable pressure signal to the pump control means 6 whereby the pump 21 comes on stroke, while the driver operated speed control device 14, 15, is movable in a second mode to cause retardation of the vehicle to send a variable pressure signal to the disproportional area actuator 2A, to adjust the throttle valve 3A to induce back pressure in the return line from the motor(s) 10, a feed back loop monitoring the regenerated pressure and permitting the throttle valve 3A to continue to close as the flow through the valve 3A reduces under the influence of the actuator 2A, at a driver selected braking pressure, until the vehicle comes to rest.
437396
Gyro Mining Transport Limited
Meredith & Finlayson
LandOfFree
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