SILENCER

原文（中文）

A silencer includes: an external shell member having a silencer chamber; and an internal pipe disposed in the silencer chamber. The external shell member has an external shell opening formed in a peripheral wall, and the internal pipe has a pipe opening is formed in a peripheral wall. The internal pipe includes a projection protruding radially outwards from the peripheral wall of the internal pipe. The projection is provided along the circumference of the pipe opening about the axis of the pipe opening. A sensor is positioned so as to plug the pipe opening. The silencer includes a cap covering the external shell opening. The cap is joined to a portion of the external shell member around the external shell opening and to the projection of the internal pipe. An outer radius dimension of the projection is set smaller than an inner radius dimension of the external shell member.