Pumps – Expansible chamber type – Pumping member position controlled port
Patent
1996-02-26
1997-02-11
Thorpe, Timothy
Pumps
Expansible chamber type
Pumping member position controlled port
417500, 91227, F04B 3910, F01L 2102
Patent
active
056014210
ABSTRACT:
A valveless, double acting, positive displacement fluid transfer device is operable either as a pump when driven by a power source, or as a motor when the fluid working portion is driven by fluid under pressure through the inlet and outlet ports of the device. The device is based upon the principle of a plunger and cylinder which are angularly offset from a rotary shaft, and connected to the rotary shaft by radial arm and a spherical bearing. The plunger simultaneously rotates and reciprocates as the rotary shaft revolves, due to the plunger stroke varying cyclically due to the angular offset, as the plunger rotates within the cylinder. The plunger includes separate internal inlet and outlet passages therethrough, which cyclically communicate with an inlet port and an opposite coaxial outlet port in the cylinder to provide both suction and discharge with each plunger stroke. Various improvements in durability and manufacturing economy are provided, such as a split spherical bearing shell and a negative draft seal retainer for ease of manufacture and assembly, and a lubrication pocket for the spherical bearing for durability.
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Litman Richard C.
Thorpe Timothy
Wicker William
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