LOCKING STRUCTURE FOR SCREW-COVER OF MACHINE

PROBLEM TO BE SOLVED: To provide a locking structure for a screw-cover of a machine for tightening up the joint faces of a housing and the screw-cover, and locking the screw-cover by the frictional force of a pressure-contact face. SOLUTION: A retention hole 11a is provided for retaining an outer-ring of a bearing at the end of the housing 11. An internal thread 11b of a first thread part and a cylindrical contact part 11c having a larger internal diameter than the internal diameter of the internal thread 11b are formed in the axially outward direction. On the outside periphery of the screw cover 16, there are provided an external thread 16a and a press-fit part having a larger diameter than the inside diameter of the cylindrical contact part 11c. The press-fit part is formed in a conically tapered part 16b. When the screw cover 16 is screwed in the housing 11, the tapered face of the conically tapered part 16b and the inside face of the cylindrical contact part 11c are brought into pressure contact to each other, and both the contact faces are tightened up to lock the screw cover 16 by the frictional force of the pressure-contact face. Thus, the screw cover does not become loose by vibration of the housing. COPYRIGHT: (C)2007,JPO&INPIT