Multi-piston hydraulic pump for a free piston engine

Details Multi-piston hydraulic pump for a free piston engine Multi-piston hydraulic pump for a free piston engine

1996-06-28

2001-06-05

Koczo, Michael (Department: 3746)

Pumps

Motor driven

Fluid motor

C123S0460SC

Reexamination Certificate

active

06241488

ABSTRACT:

The present invention relates to a multi-piston hydraulic pump for a free-piston engine, comprising two engine pistons mounted on a common piston rod which is also fitted with pin-shaped pistons of the hydraulic pump at a radial distance from the piston rod, and mounting blocks for the hydraulic pump pistons extend from the engine piston rod at a distance from each other and the free ends of the hydraulic pistons point in opposite directions.
This type of free-piston engine with its multi-piston hydraulic pump is prior known from the Patent publication U.S. Pat. No. 4,097,198. An object of the invention is to improve this prior known mechanism in view of optimizing the space utilization of a hydraulic pump and, thus, for reducing the overall length of an engine.
This object is achieved by the invention on the basis of the characterizing features set forth in the appended claim 1.
The invention is further capable of achieving the additional advantage that the mounting blocks of hydraulic pump pistons can be used as pistons for the scavenger pumps of engine cylinders.


REFERENCES:
patent: 2503152 (1950-04-01), Ekblom
patent: 2739671 (1956-03-01), Edge et al.
patent: 3089305 (1963-05-01), Hobbs
patent: 3149773 (1964-09-01), Cudahy
patent: 3986796 (1976-10-01), Moiroux et al.
patent: 4087205 (1978-05-01), Heintz
patent: 4097198 (1978-06-01), Herron
patent: 4128083 (1978-12-01), Bock

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