Reciprocating hydraulic motors

Details Reciprocating hydraulic motors Reciprocating hydraulic motors

1977-10-04

1979-07-24

Hafer, Robert A.

Tool driving or impacting

Impacting devices

With means for rotating tool

173134, 91300, B25D 900

Patent

active

041619897

ABSTRACT:
A reciprocating hydraulic motor, for example for a rotary percussive drilling head, includes a piston and cylinder having a piston face exposed to the pressure in a compression chamber which is connected through ports controlled by the piston to a supply pressure at one end portion of its stroke, and to exhaust at an opposite end portion of the stroke, while between these end portions of the stroke is a compression/expansion travel during which the compression chamber is closed and the liquid in it alternately expands over a higher range of pressure and is compressed over a lower range of pressure.
For returning the piston, in the direction in which liquid is compressed, one of two opposed faces of the piston is exposed to the pressure in a biasing chamber which communicates permanently with a constant pressure supply while the other communicates with the compression chamber.

REFERENCES:
patent: 3044452 (1962-07-01), McCrory et al.
patent: 3055441 (1962-09-01), Morrison
patent: 3780622 (1973-12-01), Vogel
patent: 4028995 (1977-06-01), Salmi et al.
patent: 4034817 (1977-07-01), Okada

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