Machine component composed of metal and rubber and manufacturing method of the same

A protective cover for a bearing device, the protective cover being a machine component composed of metal and rubber, wherein the machine component is formed by applying a thermoset resin adhesive to a surface of a metal component of a predetermined shape, and vulcanizing and adhering a rubber of a predetermined shape to part of the surface of the metal component by metal molding, the protective cover comprising:

• a seal as the rubber, which is vulcanized and adhered to an outer peripheral surface of a cup-shaped stainless-steel main body as the metal component;
• wherein the metal component comprises;
• at a maximum outer diameter part of the main body, a first cylindrical part;
• a second cylindrical part that is smaller in diameter than the first cylindrical part and is connected to an end edge of the first cylindrical part;
• a first disc part that is substantially perpendicular to the first cylindrical part;
• a third cylindrical part that is smaller in diameter than the second cylindrical part and is connected to an end edge of the first disc part;
• a second disc part that is substantially perpendicular to the first cylindrical part;
• and
• a fourth cylindrical part that is smaller in diameter than the third cylindrical part and is connected to an end edge of the second disc part;
• wherein the first disc part is disposed between the second cylindrical part and the third cylindrical part, the second disc part is disposed between the third cylindrical part and the fourth cylindrical part, the seal is in contact with at least the second cylindrical part, the seal does not cover the first disc part, the first cylindrical part has an outer peripheral surface that is to be pushed into an outer ring of the bearing device, and a range of the thermoset resin adhesive applied to the surface of the metal component before the metal molding covers only a joint surface relative to the seal.