| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide heating piping having high layout performance, and reducing a heat loss of a forward pipe and a return pipe, by constituting an outer peripheral surface of the forward pipe so as to be adjacent to the return pipe. <P>SOLUTION: This heating piping has the forward pipe 10 connected between a water-cooled engine 90 and a front heater 91 for heating air and making hot water flow in the front heater 91, and the return pipe 11 making the hot water flowed out of the front heater 91 flow in the water-cooled engine 90. The forward pipe 10 and the return pipe 11 are formed in a substantially circular shape in a passage cross section, and are composed of a double tube structure for arranging the forward pipe 10 on the inner peripheral side of the return pipe 11. Thus, the layout performance is enhanced, and the heat loss of the forward pipe and the return pipe can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
