| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical bearing member capable of sufficiently showing lubricating function by maintaining lubricating oil filled in oil reserving blind grooves for a long time, and to provide a manufacturing method of the cylindrical bearing member capable of efficiently mass-producing the oil reserving blind grooves inside a cylindrical member at low costs. SOLUTION: In this cylindrical bearing member 100, a plurality of oil reserving blind grooves 112 provided in the inner peripheral surface of the cylindrical member 110, which is formed without a buss-like joint, are provided with a plurality of grooving projections HP1 in the peripheral surface of an end thereof, and a plurality of diameter enlarging slits HP2 are respectively formed by using a hollow die pin HP provided along the longitudinal direction of the pin and a diameter enlarging center pin EP to be inserted and drawn inside the hollow die pin HP. COPYRIGHT: (C)2006,JPO&NCIPI |
