Machining tool for manufacturing radial bearings, and manufacturing apparatus and manufacturing method using the same

A radial bearing manufacturing apparatus with a bearing hole inner surface finishing tool, the inner surface finishing tool comprising:

• a tool shaft main body member defining a hollow storage section;
• a rotatable core piece member having a circular cross-section and provided inside the hollow storage section of the tool shaft main body;
• and
• a plurality of rollable machining members disposed about the rotatable core piece member, each of the roll machining members having a circular cross-sectional roll machining surface in contact with an outer circumference surface of the rotatable core piece member,
• where the rotatable core piece member is movable at least in a radial direction and in an axially tilted direction with respect to a central axis of the tool shaft main body member.

A radial bearing manufacturing method using a radial bearing finishing tool, the radial bearing finishing tool comprising:

• a tool shaft main body member defining a hollow storage section;
• a rotatable core piece member provided inside the hollow storage section of the tool shaft main body;
• and a plurality of rollable machining members disposed about the rotatable core piece member, each of the roll machining members having a circular cross-sectional roll machining surface in contact with an outer circumference surface of the rotatable core piece member, the method comprising the steps of:
• providing the rotatable core piece member in the hollow storage section of the tool shaft main body member in a manner freely movable in a radial direction and in a tilted axial direction against a central axis of the tool shaft main body member;
• inserting the radial bearing finishing tool into a bearing hole to be formed in a bearing member;
• providing a rotational movement to the rotatable core piece member to thereby rotate each of the plurality of roll machining members at a uniform velocity to cause movements to the rotatable core piece member in the radial direction and in tilted axial directions against the central axis of the tool shaft main body member;
• and
• centering the plurality of roll machining members by the movements of the rotatable core piece member about the central axis of the bearing hole to finish an inner circumference surface of the bearing hole.