Device to reduce pulsations on a hydrostatic positive displaceme

Details Device to reduce pulsations on a hydrostatic positive displaceme Device to reduce pulsations on a hydrostatic positive displaceme

1998-02-16

2000-09-12

Freay, Charles G.

Pumps

Expansible chamber type

Having pulsation dampening fluid receiving space

60469, 91487, 91489, F04B 1100, D01B 1304

Patent

active

061168718

ABSTRACT:
This invention relates to a device to reduce pulsations on a hydrostatic positive displacement unit, such as an axial piston machine or a radial piston machine which can be used both as a pump and as a motor. The direction of rotation of the positive displacement unit is reversible and at least one piston is mounted so that it can move longitudinally in a cylinder bore forming a cylinder chamber. The device has a buffer element which can be brought into communication with the cylinder chamber by a connecting channel. It is possible to further optimize the reversing action of the cylinder chambers from the inlet side to the outlet side and to effectively minimize pulsations in a broad bandwidth of operating conditions by increasing the capacity of the buffer element compared to the capacity of an oil-filled buffer element and/or by providing at least one additional connecting channel which connects the cylinder chamber with the buffer element or with a control nodule of the positive displacement unit, whereby a throttling device is located in the other connecting channel. The buffer element may be a hydropneumatic buffer.

REFERENCES:
patent: 2474512 (1949-06-01), Bechtold et al.
patent: 3804125 (1974-04-01), Sonneman
patent: 3956969 (1976-05-01), Hein
patent: 5171134 (1992-12-01), Morgart et al.
patent: 5538401 (1996-07-01), Schaffner et al.
patent: 5572919 (1996-11-01), Ishizaki

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