Hydrostatic braking power converter
AssigneeKarl Schaeff GmbH & Co., Maschinenfabrik
InventorHans Schaeff
Life of this patent
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Abstract
A braking power converter for trucks, busses, trailers, semitrailers and cars as a long-term brake, with oil as the working fluid and an oil cooler, wherein one or more high-pressure reciprocating pumps, which can control the transporting capacity up to zero transport, are driven continuously by the vehicle proportionately to the travelling speed, and an oil flow is compressed to a high pressure of roughly 300 to 900 bar during the braking operation, subsequently relieved of pressure and thereby heated up, after which the heated oil flow is recooled in the oil cooler.
Claims10
A hydrostatic braking energy converter of the retarder type for installation in self-propelled or pulled vehicles, comprising:
- a compact converter housing unit integrating at least a hydraulic displacement pump (1-5, 50) having an inlet suction duct (6) and an outlet delivery pressure duct (7), a pressure relief valve (8) normally seated to close said pressure duct, and a return line (17) leading from the pressure relief valve to the suction duct (6) of the pump, the components being connected in series and forming a closed hydraulic circuit, the displacement pump having reciprocating pistons (3), and control means (64, 65) for varying down to zero delivery and for high pressure delivery in the range of about 300 to 900 bar, the displacement pump having a drive shaft adapted to be coupled to a drive of the vehicle by means of a step-up gearing, and for being driven by the vehicle's thrust energy during braking to convert the thrust energy into heat;
- an oil cooler (19) connected via loop lines (18, 20) extending externally from the converter housing unit, and wherein a thermostat-controlled by-pass valve (15, 16) is connected to the loop lines to prevent fluid flow to the oil cooler until the oil within the converter housing is heated;
- and
- a blower means (25) which may cause air to flow through the oil cooler when the displacement pump is being driven during braking.
The converter as set forth in claim 11, wherein the displacement pump includes one of radially and axially reciprocating pistons and is of double-action type, with two shaft ends and connecting flanges at its casing for attachment and installation between one of two axle and shaft sections, especially in a symmetrical manner.
Dependencies are inferred from the claim text.