Method of making the body of a hydraulic master cylinder
AssigneeNissin Kogyo Co., Ltd.
InventorYukikazu Miyashita
Life of this patent
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Abstract
A master cylinder body including a cylindrical-shaped inner section of uniform wall thickness formed as by die-casting and an outer section cast on the inner section around the periphery thereof. The extreme simplicity in configuration of the inner section enables it to be formed with no casting defects such as shrinkage cavities which may result in oil leakage therethrough. The inner section and the outer one cast thereon become solidly fused together at the cylindrical interface therebetween as long as the materials used are of the same metallurgical type. Formation of a multitude of annular or helical ridges on the outer periphery of the inner body section further ensures the solid interconnection between the two body sections.
Claims4
A method of making the body of a hydraulic master cylinder comprising the steps of:
- forming a cylindrically shaped inner body section of substantially uniform wall thickness at all parts thereof, having a cylinder bore therein;
- casting an outer body section on said inner body section around the outer periphery thereof said outer body section having an oil reservoir intergrally formed therein, from a material substantially the same as that of said inner body section, whereby, said inner and outer body sections fuse to one another at the cylindrical interface therebetween and forming port means through said outer and inner body sections for communication between the interior of said reservoir and the cylinder bore of said inner body section.
Dependencies are inferred from the claim text.