Abstract: A motor vehicle servo steering system control for flow rate to the hydraulic steering cylinder mechanism utilizes a flow regulating bypass valve between the inlet and outlet of the system pump. A throttle bore device in the pump outlet is adjustable as to bore position to effect a variable operating pressure differential on the flow regulating valve bypass of the pump. The purpose of the arrangement is to effect as constant as possible a rate of flow to the steering servo cylinder mechanism at any given speed but with lowering of rate of flow when pump speed is increasing with engine speed. Accordingly, the invention provides a generally uniformly varying decrease in the amount of steering assist which a vehicle driver receives with increase in vehicle speed so as to convey a safer sense of road reaction at high speeds than would otherwise occur.

Abstract: A hydraulic governor valve coordinates the flow of crop material to a processing unit with the rate of processing of material therein. A gear driven pump is powered by the processing unit in direct relation therewith to drive a conveyor hydraulic motor. The flow responsive governor valve diverts flow to a reservoir when the processing unit is overloaded and to the conveyor motor otherwise to coordinate delivery of crop material with processing of same.

Abstract: A fluid operated reciprocatable device has an outer, usually fixed, member nd an inner relatively movable member joined by a resilient member e.g., of rubber. The outer member is closed at one end so as to form an enclosure into which fluid under pressure can be admitted so as to displace the inner member in a given axial direction relative to the outer member. When a pulsating pressure is applied to the fluid the inner member vibrates axially in accordance with the pulses. The resilient member is proportioned so that its dimension in the axial direction is large in comparison with the thickness between the outer and inner members, e.g. 4 times larger. The properties of the resilient member are chosen so that it acts not only as a seal between the outer and inner members to contain fluid, but as a return spring whereby the inner member is returned, between fluid pulses, from an axially displaced position.

Abstract: An improvement in a control system, including a brake device, for a vehicle having a hydrostatic transmission which includes a hydrostatic pump and a hydrostatic motor. The hydraulic control circuit includes a control pump, a high pressure conduit, a low pressure conduit, differential pressure regulator valve means and a directional control valve means interposed in the high and low pressure conduits and a fixed orifice means interposed in the low pressure conduit upstream from the differential pressure regulator valve. The improvement takes the form of an adjustable orifice means interposed in a branch conduit, between the high and low pressure control conduits downstream from the fixed orifice means, with the adjustable orifice means permitting the adjustment of the pressure differential between the high and low pressure control conduits.

Abstract: A base frame with four wheels, two of which are powered by separate hydraulic motors connected in series so that the fluid flowing through one motor then flows through the other. A speed control is provided whereby the constant output of a hydraulic pump either passes entirely through the motors or is partially bypassed around the pump.

Abstract: A hydraulic circuit comprises a first tank elevated above a second tank and openly communicating therewith by a conduit adapted to continuously maintain the second tank at full capacity with a hydraulic fluid. The hydraulic fluid is pumped out of the second tank and to a work system wherefrom it is recircuited back through a filtering system, retained in the first tank. Upon malfunctioning of the filtering system to prevent the egress of hydraulic fluid therethrough, the increased pressure level of the recircuited hydraulic fluid will function to open a directional control check valve in the second tank to by-pass the conduit normally communicating hydraulic fluid from the first tank to the second tank.

Abstract: A cavitation suppressor for use in a hydraulic system, the cavitation suppressor serving to prevent excessive pressure in the system by bypassing hydraulic fluid around a mixing section to reduce the need for aspiration of additional fluid from a reservoir. The cavitation suppressor also prevents dissolved air in the system from coming out of solution. It includes inlet, mixing and outlet sections, and fluid bypass means communicating the inlet section with the outlet section.