Patent ID: 9657615
Date: 2017-05-23
CPC Classifications: F01N

Claim:
1. A silencer for an internal combustion engine, said silencer comprising: a main body, said main body including an outer tube closed at front and rear ends thereof, wherein an exhaust connection tube to which an exhaust pipe extending from an engine side is connected and a discharge pipe for discharging exhaust gas to the outside therethrough are connected to the outer tube, respectively, and a first partition wall and a second partition wall provided in order from an upstream side in the main body such that an inside of the main body is partitioned into a first chamber and a resonance chamber by the first partition wall and is partitioned into the resonance chamber and a second chamber by the second partition wall, and wherein a conduit is supported on the first partition wall and the second partition wall, wherein the conduit has a downstream end portion configured from a tubular member including a conduit discharge port which extends through the main body and discharges exhaust gas to outside, wherein the tubular member includes a resonance communication hole which communicates with the resonance chamber and an upstream side communication hole and a downstream side communication hole which communicate with the second chamber, and wherein a closing portion which closes an exhaust path at an intermediate location of the tubular member, or a throttle portion which throttles the exhaust path, is provided between the upstream side communication hole and the downstream side communication hole in an inside of the tubular member.