Silencer

Abstract: A silencer 20 includes an external shell member 31 having a silencer chamber SP defined therein and an internal pipe 51 disposed in the silencer chamber SP. The external shell member 31 has an external shell opening 60 formed in a peripheral wall thereof, and the internal pipe 51 has a pipe opening 68 is formed in a peripheral wall thereof. The internal pipe 51 includes a cylindrical projection 69 protruding radially outwards from the peripheral wall of the internal pipe 51. The projection 69 is provided along the circumference of the pipe opening 68 about the axis of the pipe opening 68. An oxygen sensor 64 is positioned so as to plug the pipe opening 68. The silencer 20 includes a cap 72 that covers the external shell opening 66. The cap 72 is joined to a portion of the external shell member 31 around the external shell opening 66 and to the projection 69 of the internal pipe 51. An outer radius dimension d1 of the projection 69 is set smaller than an inner radius dimension d2 of the external shell member 31.

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