Patent ID: 6910550

Claim:
A muffler arrangement for an internal combustion engine of a portable handheld work apparatus, the muffler arrangement comprising: said engine including a cylinder having an exhaust-gas stub through which exhaust gas is discharged during operation of the engine; said engine further including a cooling air blower for generating a cooling air flow; a muffler including a muffler housing partitioned into an inlet space and an outlet space; said muffler further including an exhaust-gas inlet opening into said inlet space and connected to said exhaust-gas stub adjacent said cylinder; said muffler further including an exhaust-gas outlet for conducting exhaust gas out of said outlet space; an outer cover mounted on said muffler housing and said outer cover and said muffler housing conjointly delimiting an air channel extending along a side of said muffler; said air channel having a first end for receiving a component of said cooling air flow generated by said cooling air blower independently of a flow of said exhaust gas and having a second end where the cooling air flow component exits; feed means for conducting a jet of said exhaust gas from said exhaust-gas outlet into said air channel so as to cause said jet of exhaust gas to flow at a spaced relationship to all sidewalls of said air channel and be surrounded by said cooling air flow component in such a manner that said jet is a core flow and said cooling air flow component is a jacket flow surrounding said core flow; and, said feed means including a plurality of exhaust-gas outlets for conducting exhaust gas into said air channel.