| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner tube structure for an internal combustion engine double tube, eliminating the possibility of forming a gap between inner and outer shaft ends even when adopting the construction of radially superimposing the shaft ends of tubular members each section-shaped with a flat portion and a curved portion combined. SOLUTION: The inner tube structure for the internal combustion engine double tube comprises the plurality of tubular members 2 joined together in the tube-axial direction. In a joint portion 3 between the tubular members 2, the shaft end 2c of one tubular member 2 is fitted to the inside of the shaft end 2d of the other tubular member 2 and the shaft ends 2c, 2d are each section-shaped with the flat portion 2a and the curved portion 2b combined. As a restricting means for restricting the deformation of one tubular member 2 to the inside of the flat portion 2a, a reinforcing member 4 is provided on the joint portion 3 for contacting the flat portion 2a of one tubular member 2 at its inside to support the flat portion 2a in the radial direction of the tubular member 2. COPYRIGHT: (C)2007,JPO&INPIT
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