Positive control for hydrostatic motors, especially radial pisto

Details Positive control for hydrostatic motors, especially radial pisto Positive control for hydrostatic motors, especially radial pisto

1979-08-17

1982-10-05

Freeh, William L.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Means varies cyclic relation between reciprocating member...

91492, F01B 106

Patent

active

043523196

ABSTRACT:
The invention relates to a positive control especially radial piston motors for hydrostatic motors. Such control, while permitting a large range of rotational speed, is capable of avoiding disturbances in the oil flow occurring during coverage of the edges of includes slide valves and provides optimum smoothness of operation of the hydrostatic drive. It is the object of each slide valve to control the connection between an associated working cylinder and the inflow and outflow of the pressure medium. It is a further object of the slide valve to establish connection between the associated working cylinder and a pressure equalizing conduit, at least during coverage of a first pair of control edges, i.e. in a phase during which the working cylinder is cut off both from the pressure medium intake and from the pressure medium outlet. For this purpose the slide valve is provided with a second pair of control edges. The arrangement is such that two cylinder spaces each with oppositely moving working pistons are short-circuited via a pressure equalizing channel common to all equalizing conduits, particularly when the number of working cylinders arranged in a ring around the rotational axis is uneven. During normal operation the drive for the slide valve and the drive for the working piston are offset in circumferential direction one with respect to the other by about 90.degree..

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