| 摘要 |
A cap has a pair of L-shaped, flexible engaging arms that extend, from the end of a cap body opposite to the direction of fitting, in the direction of fitting with a distance away from the cap body. The distal ends of the engaging arms are connected by a pair of flexible connecting bridges to surround the outer periphery of the cap body with a distance away therefrom. The cap body is fitted into a cylindrical part of a cylinder head cover and engaging projections of the pair of engaging arms are engaged with an engaging recess in the outer periphery of the cylindrical part. The engaging arms are flexed to get away from the outer periphery of the cylindrical part by pushing circumferentially middle parts of the connecting bridges to come close to each other, so that the engaging projections are disengaged from the engaging recess.
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