Hydraulic piston machine having sheathing plastic material for reducing friction
AssigneeDanfoss A/S
InventorsEgon Kristensen, Lars Martensen, Sten Jensen Olesen
Life of this patent
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Abstract
A hydraulic piston machine is disclosed, having a cylinder body, which has at least one cylinder, in which a piston is arranged to move back and forth and bears by way of a slide shoe against a control surface, and having a pressure plate which holds the slide shoe in engagement with the control surface. It is desirable to be able to operate such a machine also with a fluid that has no or only poor lubricating properties. To that end, the pressure plate and/or the control surface is provided with a layer of a friction-reducing plastics material at least in one of the regions with which in operation they rub against other parts.
Claims10
A hydraulic piston machine having a cylinder body having at least one cylinder in which a piston is arranged to move back and forth, the piston bearing by way of a slide shoe against a control surface, and having a pressure plate which holds the slide shoe in engagement with the control surface, at least one of the pressure plate and a swash plate having the control surface having a layer of a friction-reducing plastics material with at least one of the pressure plate and the swash plate being sheathed in the friction-reducing plastics material.
A machine according to claim 3, in which the pressure plate is bevelled proximate its edge on its side facing towards the cylinder body.
Dependencies are inferred from the claim text.