| 摘要 |
A cap-like valve body 37 is fitted on an outer circumference of an end portion of a communicating pipe 35 that provides a communication between a plurality of silencing chambers formed in a muffler main-body. A compressed coil spring 39 is mounted between a flange 35b of the communicating pipe 35 and a flange 37d of the valve body 37. Communication holes 38 are formed in a cylindrical portion 37a of the valve body 37. When the valve body 37 receives the pressure of the exhaust gases at a pressure receiving surface 37b and moves along the axial direction against the biasing force of the spring 39, the exhaust gases within the communicating pipe 35 flow out of the communication holes 38 to the outside of the valve body 37.
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