US Patent 10508580 Combined heat exchanger and exhaust silencer

The present invention relates to a combined heat exchanger and exhaust silencer for a vehicle, comprising a bypass valve configured to: in a first state, allow a flow path for exhaust gas to be open from an inlet to an outlet via an at least partly perforated bypass pipe, and in a second state, close said flow path, whereby at least a main portion of said exhaust gas is forced through a second flow channel comprising a heat exchanger pipe. The second flow channel is formed by an annular space between an at least partly perforated second pipe and an at least partly perforated third pipe. A sound absorbing material surrounds the bypass pipe and the third pipe, and is further arranged inside the second pipe.