Patent ID: 9062581
Filing Date: 2015-06-23
Classification: F01N

Abstract:
1. An exhaust-gas muffler comprising: a relief valve provided between two of a plurality of exhaust-gas chambers formed in a casing such that exhaust gas is allowed to sequentially flow therethrough, the two of the plurality of exhaust-gas chambers being an upstream exhaust-gas chamber on an upstream side and a downstream exhaust-gas chamber on a downstream side in a flow direction of the exhaust gas, the relief valve comprising: the relief valve being configured to open when pressure of the upstream exhaust-gas chamber is a predetermined value or higher, and the seal member being made of a metal mesh material and formed into a disc shape to cover an exit of the gas passage; a pair of guide members fastened to opposite sides of the open end of the gas passage, each guide member of the pair of guide members having a U-shaped configuration with an open end portion of the U-shaped configuration fastened to the open end of the gas passage and a closed end portion of the U-shaped configuration extending away from the open end of the gas passage; and a spring case fastened to the shutter member and configured to receive a coil portion of the spring, the spring case having a pair of protruding portions that respectively protrude within the U-shaped configuration of the pair of guide members to guide opening and closing actions of the shutter member, and to come in contact with the closed end portions of the pair of guide members to restrict movement of the shutter member.