Generic free-piston engine with transformer valve assembly for reducing throttling losses
AssigneeMannesmann Rexroth GmbH
InventorsRudolf Schaeffer, Joerg Dantlgraber
Life of this patent
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Abstract
A free-piston engine directed to reduced throttling losses at minimum expenditure is provided. The free-piston engine has an engine piston, and a hydraulic piston co-operating with the engine piston. The engine piston may receive application of a force in the direction of compression via a hydraulic cylinder. A pressure in a high-pressure accumulator means or a low-pressure accumulator may be communicated to the hydraulic cylinder via a switchover valve. Between the hydraulic cylinder and the switchover valve is a valve assembly including a control piston. A connection to the high-pressure accumulator means may be controlled open with the aid of the control land of the control piston.
Claims12
Free-piston engine having an engine piston and a hydraulic piston cooperating with the engine piston, to which hydraulic piston a pressure in a high-pressure accumulator means or in a low-pressure accumulator is capable of being applied with the aid of a switchover valve, wherein between said hydraulic piston and said switchover valve a transformer valve assembly including a control piston is arranged, wherein a connection to said high-pressure accumulator means is capable of being controlled open via a control land of said control piston, and that said control piston receives application of a pressure in a hydraulic cylinder and the force of a control spring in a closing direction, and an output pressure from the switchover valve or a pressure from said high-pressure accumulator means in an opening direction, wherein a stroke of said control piston in the opening direction is limited by a stop before termination of the stroke of said hydraulic piston.
Dependencies are inferred from the claim text.