Control plate of a hydraulic machine and hydraulic machine
AssigneeDanfoss A/S
InventorsStig Kildegaard Andersen, Poul Erik Hansen, Olaf Worm
Life of this patent
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Abstract
A control plate (18) of a hydraulic machine is described, the control plate (18) includes a body (21), an arrangement of openings (22, 23), and a contact face (24). In order to operate a hydraulic machine with a low noise level the body (21) is made of a plastic material. The control plate may be used as port plate or as valve plate.
Claims16
A control plate for slidably engaging a pressure plate of a hydraulic machine, the control plate comprising a body, an arrangement of openings, and a contact face, wherein the body is made of a flat plastic material, wherein the plastic material is a fibre reinforced plastic material, wherein the fibre reinforced plastic material includes fibres arranged in layers, and wherein the layers are stacked in a direction perpendicular to the contact face.
The control plate according to 3, wherein the plastic material comprises a fibre content of at least 55%.
A control plate for slidably engaging a pressure plate of a hydraulic machine, the control plate comprising a body, an arrangement of openings, and a contact face, wherein the body and the contact face are made from a plurality of fibre reinforced prepreg layers and wherein a fibre reinforced prepreg layer forming the contact face is parallel to the contact face.
A control plate for slidably engaging a pressure plate of a hydraulic machine, the control plate comprising a body, an arrangement of openings, and a contact face, wherein the body and the contact face are made of a plastic material reinforced by fibres, and wherein at least in a thickness region adjacent the contact face more than 50% of the fibres include an angle with the contact face of less than 30°.
Dependencies are inferred from the claim text.