Patent GB-224902-A (GB)
Title: Improvements in and relating to hydraulic transmission apparatus
IPC: F16H39/02
Filed: 1924-11-12
Abstract: 224,902. Universal Engineering Corporation, (Assignees of Robson, J.). Nov. 12, 1923, [Convention date]. Stroke, varying. - Hydraulic variable-speed, power-transmission mechanisms specially applicable to self-propelled vehicles, and of the type comprising a pump delivering liquid to a motor, are provided with means for providing flexibility in the connections between the pump and motor and for collecting and returning leakage. The ball ends of pressure and suction pipes 53, 82, Fig. 7, are disposed in two-part sockets and spring-pressed washers 57 are provided, the sockets being rigid with cylinders 60, 79 free to slide over hollow plungers 61, 77, Fig. 4, which at their lower ends are balljointed to the motor. Flexible covers 86, 87 are provided, together with chains 89 and stops 93 for limiting the oscillating movement of the cylinders. Leakage is collected by pumps 216, Fig. 1, and delivered to a tank 183, which also receives oil leaving the motor casings through expansion. The pump and motors are of the kind described in Specifications 13894/07, 13895/07, and 13897/07. The Specification as open to inspection under Sect. 91 (3) (a) comprises also means for controlling the pump, cooling means, and means for maintaining a definite pressure in the suction conduit to prevent air from being drawn into the mechanism in the event of a leak. The pump control comprises manual and servomotor means and pressure-actuated automatic means. At each end of the vehicle is a handwheel connected through gearing and linkwork to one end of a lever 120, Fig. 11 (Cancelled), the other end of which is connected to the valve 106 of a servomotor 105, the piston of which adjusts the pump swashplate. A piston 152, Fig. 5 (Cancelled), is arranged in the connections between the handwheel and lever 120, so that if the handwheel is released, the swashplate is moved into the neutral position. As the valve 106 is operated, liquid supplied from a pump 177, Fig. 1, is admitted to one side of the servomotor piston, the other side being put into communication with the interior of the pump casing. The piston is thus moved assisted by an enlargement 106 or 107 on the valve acting on the piston rod. In order to enable the swashplate to be moved to its neutral position by manual effort only when the driving engine is stopped, a by-pass may be opened between the end chambers 205, 206, Fig. 15 (Cancelled), of a valve device connected by ducts 213, 214 to the pressure and suction ports of the pump. The fulcrum of the lever 120 is carried by a rod 123, Fig. 12 (Cancelled), acted on by a spring 167 and b liquid entering through ports 132 which are each connected to one of the pump ports. Pressure is maintained in the suction pipes by a connection 202, Fig. 15 (Cancelled), from a lowpressure auxiliary pump 188, branches controlled bv valves 209, 210 leading through ducts 213, 214 to the main pump ports. In an alternative form, connected valves and adjustable screw stops 237, Fig. 20 (Cancelled), are provided. A countershaft 193 drives an air compressor and a fan 197 for forcing air through the engine radiator 200 and to the tank 183. This subject-matter does not appear in the Specification as accepted.