| 摘要 |
<p>PURPOSE:To shorten the length of a water passage leading to an exhaust pipe from a water tank as well as to secure a sufficient amount of water as the water tank by setting up an engine in the lower part of a main frame, while forming this main frame into hollowness, and using this hollow part as the water tank. CONSTITUTION:Cooling water in a water tank T is poured into each of exhaust pipes 14, 15, 18 and 19 extending out of an engine 5, whereby exhaust gas is colled. With this operation, a pressure pulsation state in each exhaust pipe is adjusted aright, thus any possible power drop is ameliorated. In this case, the engine 5 is set up in the lower part of a symmetrical pair of main frames 1 extending to the rear from a head pipe 2. Then each main frame 1 is formed into hollowness, and this hollow part is formed into the water tank T. For example, a front part of the main frame 1 is reinforced with a box structural gusset 38, and an interval between respective upper parts of symmetrical pivot plates 6 connected to the rear part is connected by an upper cross pipe 39. In addition, respective members are formed into hollowness each and interconnected with each other, through which the water tank T is formed as a whole.</p> |
