Pumps – Expansible chamber type – Distributor movement adjustable
Patent
1978-04-03
1981-05-26
Freeh, William L.
Pumps
Expansible chamber type
Distributor movement adjustable
417222, F01B 1304
Patent
active
042695740
ABSTRACT:
A fluid device of the axial piston type having high and low pressure operating passages, one of which may be an inlet and the other an outlet, depending upon the pumping and motoring function of the device. The device is of the variable displacement type having a rotatable cylinder barrel with each end of a plurality of pistons being disposed for reciprication within cylinder bores in the cylinder barrel. The cylinder barrel has cylinder ports successively communicating each of the cylinder bores with arcuate inlet and outlet passages formed in a valve face disposed at one end of the cylinder barrel. The other ends of the pistons extend from the other end of the cylinder barrel and include spherical balls and socket joints which are drivingly engaged by an inclined thrust plate assembly disposed to impart the reciprical stroking movement to the pistons within the cylinder bores as the cylinder barrel is rotated. In one example of the invention means are provided for laterally supporting the cylinder barrel on a drive shaft. The lateral support means is in the form of a coaxial annular land which engages the cylinder barrel at the piston projecting end thereof. The annular land has a lateral centerline spaced axially outwardly from the point of intersection of the shaft axis and the general plane of the locus of the centers of the spherical balls on the projecting ends of the pistons, and the point of intersection is located in a plane between the plane of the ball centers and the valve plate end of the cylinder barrel. The disclosure includes a novel thrust plate assembly technique including a novel displacement control mechanism which is operatively coupled to the thrust plate assembly.
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patent: 3698287 (1972-10-01), Martin
patent: 3868889 (1975-03-01), Bobier
patent: 3911792 (1975-10-01), Heyl
patent: 3933083 (1976-01-01), Weisonback
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