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    • 35. 发明专利
    • SCREW TIGHTENING UNIT
    • JPH0960556A
    • 1997-03-04
    • JP23780195
    • 1995-08-23
    • MITSUBISHI HEAVY IND LTD
    • KODAMA TOSHIO
    • F02F3/00F16B31/06F16B33/02F16B35/02
    • PROBLEM TO BE SOLVED: To prevent a fatigue crack from being generated from an internal thread bottom, by providing a slit along the axial center of an external thread in a side thereof, in the case of applying a fluctuating load to act from an internal thread side, in a tightening unit of the external/internal thread. SOLUTION: A piston crown 1 and a piston rod are connected by a bolt 5 and a nut 6 by interposing an internal metal 2 and a piston inner pipe. Here, a tightening unit is constituted by an external thread (bolt) 5 and an internal thread 7. In the case of applying a fluctuating load (gas pressure) 8 from the side of the internal thread 7, generation of a fatigue crack in a bottom part of the internal thread 7 is prevented by a slit 10 ground in a tightening part to the internal thread 7 of the bolt 5. That is, cross directional rigidity of the bolt 5 is weakened by the slit 10, so as to average peak stress of the internal thread 7 by force 9 transmitted from the gas pressure 8. Simultaneously with providing the slit 10 in an end part of the bolt 5, when rigidity of a bolt main unit is formed equal to rigidity of a thread ridge, the peak stress can be reduced to, for instance, about 1/1.5.