Method of manufacturing a valve sleeve
AssigneeJidosha Kiki Co., Ltd.
InventorsHiromi Kajikawa, Masao Sugita
Life of this patent
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Abstract
A method of manufacturing a valve sleeve which is combined with a valve rotor to form a hydraulic rotary valve comprises a first step of expanding one end of a cylindrical member, a second step of forming a plurality of axial grooves in the internal surface of the cylindrical member while leaving its opposite ends intact, and a third step of restoring the expanded portion to its original diameter which it assumes before the expanding step.
Claims11
A method of manufacturing a valve sleeve, comprising a first step of expanding one end of a cylindrical member hollow, a second step of forming a plurality of axial grooves in the internal surface of the cylindrical member leaving the opposite ends thereof intact, and a third step of restoring the expanded portion to its original diameter which it assumes before the expanding step.
Dependencies are inferred from the claim text.