Multi-cylinder hydraulic piston device, a cylinder therefor, and

Details Multi-cylinder hydraulic piston device, a cylinder therefor, and Multi-cylinder hydraulic piston device, a cylinder therefor, and

1983-11-09

1989-01-24

Kyle, Deborah L.

Motors: expansible chamber type

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

Cylinders parallel to rotation axis

92 57, 92169, 148 166, 204 58, F01B 300

Patent

active

047994193

ABSTRACT:
A cylinder block for a multi-cylinder hydraulic or hydrostatic piston device is provided having a control layer comprising a sintered friction metal layer sintered onto the cylinder block under the simultaneous action of pressure and heat. The end surface of the cylinder block is first provided with an electrodeposited metal layer. The electrodeposited layer has a crystal lattice constant compatible with the sintered layer and the material of the cylinder block. The cylinder block is preferably made from steel or aluminum and the electrodeposited layer is preferably copper or nickel. After the friction metal layer, preferably bronze, is sintered onto the electrodeposited layer, the cylinder block is treated to improve the strength and wear characteristics of the cylinder block without injuring the sliding friction characteristics of the sintered friction metal layer. In the case of steel, the preferred treating process is gas nitriding, and in the case of aluminum or an aluminum alloy, the preferred treating process is anodizing.

REFERENCES:
patent: 1600961 (1926-09-01), Payne
patent: 2048578 (1934-02-01), Van Der Horst
patent: 2760925 (1952-03-01), Bryant
patent: 2933386 (1960-04-01), Pessel
patent: 3033183 (1962-05-01), Erickson
patent: 3080854 (1963-03-01), Wiggermann
patent: 3280758 (1966-10-01), Leeming et al.
patent: 3709107 (1973-01-01), Alger, Jr. et al.
patent: 3793195 (1974-02-01), Betts
patent: 3901740 (1975-08-01), Anderson et al.

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