Exhaust silencer and communicating pipe thereof

A communicating pipe used for an exhaust silencer having a plurality of damping chamber;

• the plurality of damping chambers having an uppermost-stream damping chamber an exhaust gas inlet for directly introducing exhaust gas of the internal combustion engine, and lowermost-stream damping chamber having an exhaust gas outlet for discharging the exhaust gas, the communicating pipe being used for intercommunicating a predetermined chambers of the plurality of the damping chambers, comprising:
• an end plate provided at least to a lower-stream end;
• and
• a large number of communicating holes provided to a predetermined position on an outer circumference corresponding to the chamber to be intercommunicated,
• the end plate on the lower-stream end being a hollow plate dented toward inside, wherein a total opening area of the communicating holes on the communicating pipe open to the uppermost-stream damping chamber is smaller than respective total opening area of the communicating holes open to lower-stream damping chamber.