Abstract: A transmission for a skid-steering vehicle having two tracks or two sets of wheels in which power is transferred from one or more prime movers to the tracks or wheels through a gearbox is proportional to the sum of the input speeds and the difference between the output speeds is proportional to the difference between the input speeds, the internal gearing of the gearbox consisting of two only differential gearing sets each comprising three elements within connections between two of the elements of one of the differential set with two of the elements of the other differential set. A fully hydraulic drive is preferably provided between the prime mover and hydraulic motors driving the gearbox.

Abstract: A hydrostatic pad or slipper bearing that is hydrostatically balanced to provide a substantially frictionless bearing with negligible fluid leakage, for supporting a moving part, in which there is a stationary housing in a cylindrical recess in which is mounted a bearing pad movable in the recess and surrounded by a liquid seal, the outward face of the pad being shaped to bear on the moving part to be supported and having a recessed area in its outward face which is defined by sealing land. A passage through the pad provides a communication between the inward face of the pad and the recessed area. Within the housing is a cylindrical cavity containing a valve assembly which is connected in a manner that is free of back lash to the pad so that the valve moves with the pad. The cylindrical cavity is supplied with liquid under pressure the entry of which is controlled by the valve and also with a passage leading to an area of lower of pressure.

Abstract: A hydraulic pump for liquids of the type comprising a body, a cylinder rotor surrounded by and mounted in an external support, the body having an inlet port and an outlet port for the liquid to be pumped and the rotor carrying a plurality of equiangularly spaced cylinders which are disposed parallel to or radially extending from the rotor axis, pistons in the cylinders being caused to reciprocate as the rotor is rotating, by cam means such as a surface inclined to the rotor axis or by inclining the rotor axis itself in order to pump liquid. As the rotor rotates the cylinders are moved sequentially past the inlet port as the liquid is drawn into the cylinders and sequentially past the outlet port as the liquid is forced out of the cylinders by the actions of the pistons.