| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw loosening prevention structure preventing looseness at high temperatures even if a member forming a male screw and a member forming a female screw have different thermal expansion coefficients, having a simple configuration and achieving good efficiency of fastening work. SOLUTION: An inner peripheral face 4e of a wall part 4d of an oil filter storage part 4 with a low thermal expansion coefficient is arranged on an outer peripheral face 8e of a flange part 8c in a casing 8 with a high thermal expansion coefficient, opposing to the radial direction. When the temperature is increased by operation of an internal combustion engine, contact bonding force between a tip face 4c of the oil filter storage part 4 and a lower face 8d of the flange part 8c is declined due to a difference of the thermal expansion coefficients between the casing 8 and the oil filter storage part 4, leading to reduction or disappearance of the axial force of the casing 8. However, the inner peripheral face 4e on the oil filter storage part 4 side is brought into contact with the outer peripheral face 8e on the casing 8 side so as to achieve fastening. Thus, even when loosening prevention force by the axial force is declined or disappears during temperature rise, additional loosening prevention force is generated. COPYRIGHT: (C)2009,JPO&INPIT
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