Patent GB-1089165-A (GB)
Title: Improvements in or relating to internal-combustion tractive rail vehicles
IPC: B61C17/12
Filed: 1966-01-14
Abstract: 1,089,165. Controlling locomotives. RHEINSTAHL HENSCHEL A.G. Jan. 14, 1966 [May 24, 1965], No. 1901/66. Heading B7H. In a locomotive driven by an internal-combustion engine through transmission means including respective hydraulic couplings for driving the vehicle in each direction and providing hydraulic braking, filling of the respective circuits and regulation of the engine speed is controlled from a hand wheel through a pneumatic control system arranged such that the hand wheel must be returned to the " zero " position before the locomotive can be restarted after being brought to a halt by hydraulic braking. When the vehicle is moving a gear pump 30 driven from a transmission shaft provides sufficient oil pressure to retain a spring- loaded pressure-actuated relay valve 34 in a position where air from a pressure reservoir 1 pressurizes a relay valve 7 which connects a regulating valve 2 operated by the hand wheel 6 to a speed-regulating device 8 controlling the engine speed through spring-loaded adjusting means 10, and to a relay valve 24 allowing air supplied from the reservoir 1 through an adjustable transmission-lock valve 23 to pressurize either of valve 25, 26 controlling filling of respective hydraulic torque converters 28, 29 depending on the position of an impulse valve 22 which is operated by air from one of pressbutton valves 20, 21 depressed by a cam 19 upon initial rotation of the hand wheel 6 in either direction. As the vehicle comes to rest after being hydraulically braked by filling the coupling 28, 29 corresponding to the direction of travel opposite to that in which the vehicle was moving, the pressure generated by the gear pump 30 falls until the valve 34 cuts-off the air supply from the reservoir 1 and exhausts the supply line to the valve 7 through a vent 53, whereupon the valve 7 cuts-off communication with the regulating valve 2 and vents the speedregulating device 8 and the valve 24 so that the engine idles and both torque converters 28, 29 are emptied. To restart the vehicle the hand wheel 6 must first be rotated to the "zero " position so that a cam 12 depresses a pressbutton valve 14, to supply air to an impulse valve 51 which pressurizes the relay valve 7 through a two-way valve 18 and restores communication from the regulating valve to the regulating device 8 and valve 24. As soon as the vehicle is moving and pressure from the gear pump 30 is sufficient to operate the valve 34, the impulse valve 15 is restored to its initial position by air supplied through the valve 34. An adjustable restriction 55 prevents actuation of the impulse valve 15 when the valve 14 is depressed instantaneously by rotating the hand wheel 6 through the " zero " position to apply the brakes. A second hand wheel 6<SP>1</SP> on the other side of the vehicle cab is linked to the hand wheel 6 by a chain 4 and sprockets 3. A current transmitter and a magnetic valve, or a mechanical transmitter and valve may replace the gear pump 30 and pressure-actuated valve 34. In another embodiment, two hand wheels spaced diagonally of the driving cab are not linked mechanically but actuate duplicate control valves, the pneumatic system being modified such that control can be effected by only one hand wheel at any given moment.