| 摘要 |
PURPOSE: To make a crack hardly occur in a weld part of a knotched section by molding a plate section inward in the radial direction in the vicinity of one end in the axial direction of a cylinder inner peripheral part integrally, providing a required number of knotched sections at inner peripheral fringe, and specifying the relation between a radius of curvature in a corner round section and width in the circumferential direction. CONSTITUTION: An annular plate section 4 is integrally molded inward in the radial direction in the vicinity of one end in the axial direction of a cylinder inner peripheral section 1 by using phenol resin as a material, knotched sections 5 for introducing lubricating oil are provided at four equal distances at its inner peripheral fringe, and groove sections 6 which communicate with the knotched sections 5 are radially provided on an outer end face 4a at four equal distances. A weld section exists in a plane of each groove section 6. The relation between radius R1 of a radius of curvature of a corner round section 8 provided at innermost corner of the knotched section 5 and width a in the circumferential direction of the knotched section 5 is as follows: R1 /a=0.22 to 0.30. The optimum shape and dimensional ratio for preventing the occurrence of crack are calculated based on the results of analysis. Consequently, it is possible to reduce stress generated in the weld part and the corner round section and prevent a crack from occurring in the weld part.
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