Title: Variable hydraulic pumping apparatus

Abstract: A hydraulic pumping apparatus including a cylindrical housing member having an open upper end closed by a cover held in place by a snap ring. A rotor is rotatably supported in the housing and in turn supports a plurality of pistons which are parallel to the axis of rotation of the rotor. The novelty resides in the swash plate assembly which includes an off-the-shelf bearing comprising two parallel plates with all bearings sandwiched therebetween with one of the plates engaging the pistons. An integral plastic ring member is disposed within the annular opening of the upper thrust plate of the bearing assembly and includes trunnions extending laterally in opposite directions for disposition in grooves in the cover member for changing the angle of inclination of the bearing assembly. An adjustment member extends through the cover for engaging the upper thrust plate of the bearing assembly to change the angle of the inclination thereof.

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Inventors: Wood, Robert A. R. (West Vancouver, CA, US)

Application Number: 461355
Filing Date: 1974-04-16
Publication_date: 1976-02-03
Assignee: Teleflex Incorporated (North Wales, PA)
Primary Class(es): 92/12.2 91/504
Other Classes:
US Patent Ref:

2345446	Mar, 1944	Baker	91/505.
2842068	Jul, 1958	Sundin	417/269.
3266434	Aug, 1966	McAlvay	417/222.
3739691	Jun, 1973	Bobier	91/506.
3803987	Apr, 1974	Knapp	91/506.

Other Refs:
Primary Examiner: Freeh, William L.
Assistant Examiner: LaPointe, G. P.
Attorney: McGlynn and Milton