Generic free-piston engine with transformer valve assembly for reducing throttling losses

US6863507B1 · kind B1 · utility

Assignee

• Mannesmann Rexroth AG · DE

Inventors

• Rudolf Schaeffer · Marktheidenfeld, DE
• Joerg Dantlgraber · Lohr, DE

Key dates

• Filing date: Nov 6, 2000
• Grant date: Mar 8, 2005
• Expiry date: Nov 6, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/025
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

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.