Radial piston hydrostatic machine with a first sweeping-displace

Details Radial piston hydrostatic machine with a first sweeping-displace Radial piston hydrostatic machine with a first sweeping-displace

1997-12-12

2000-06-06

Freay, Charles G.

Pumps

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

Radial cylinders

F04B 104

Patent

active

060710861

ABSTRACT:
A radial piston hydrostatic machine having a first fluid displacement stage and a second fluid displacement stage, the machine having an outer housing structure for defining an internal chamber, a drive-shaft supported in the housing and operatively connected to a cylinder-barrel located within the internal chamber, the cylinder-barrel having a number of radial cylinders and each cylinder containing a piston operatively connected to a surrounding annular track-ring, the cylinder-barrel and pistons defining a rotating-group and where the rotating-group is positioned in a sub-chamber generally defined axially by the width of the track-ring and radially by the radial distance between the cylinder-barrel and surrounding track-ring. The volume space between adjacent pistons defined as cells and fluid distribution means in the housing comprising two or more ducts lying axially adjacent the rotating-group and generally radially inwards of said track-ring to communicate with the sub-chamber to provide a first stage pumping motion when the track-ring is eccentric in position in relation to the cylinder-barrel in order to "prime" the second stage piston reciprocating assembly in the cylinder-barrel. The invention further allows more than one hydrostatic machine to be driven by the same drive-shaft whereby the drive-shaft can be extended to pass through the machine without problems arising because the low-pressure fluid passages are restricted in size.

REFERENCES:
patent: 2105454 (1938-01-01), Ferris
patent: 2818707 (1958-01-01), Sturm
patent: 3010405 (1961-11-01), Tomell
patent: 4505652 (1985-03-01), Burgdorf et al.
patent: 4555223 (1985-11-01), Budecker et al.
patent: 4686829 (1987-08-01), Thoma et al.
patent: 4975025 (1990-12-01), Yamamura et al.
patent: 5046931 (1991-09-01), Runkle
patent: 5482442 (1996-01-01), Blair et al.
patent: 5626465 (1997-05-01), Thoma

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