PURPOSE: To simplify a construction and enable the assembly of the construction by holding a spacer between the one end of a bent inner tube and the one end of a bent outer tube.
CONSTITUTION: A spacer 10 is positioned between a pair of bulged parts 5 and 6 of a bent inner tube 1, and held between the outer surface of the bent inner tube 1 and the inner surface of a bent outer tube 3. The one end 4 of the bent inner tube 1 is therefore connected to the one end 7 of the bent outer tube 3 so that they can be moved in axial direction relatively to each other through the spacer 10. By this, the one end 4 of the bent inner tube 1 is free over the spacer 10, and thus the one end 4 of the bent inner tube 1 can be heat-deformed along its axial direction by exhaust gas. Then, because the spacer 10 is held between the pair of bulged parts 5 and 6 of the bent inner tube 1, a displacement caused at the one end 4 of the bent inner tube 1 provides the same function as the spacer 10 is fixed to the one end 4 of the bent inner tube 1. Thus the construction of a sliding part at the one end of the bent inner tube 1 and bent outer tube 3 can be simplified.
INOMATA TOMOHISA
AMADA KATSUMI
