| 摘要 |
PURPOSE:To markedly reduce the length of an air pipe for a gear box by allowing the air pipe for the gear box into which a final reduction gear for the interlocking with a propeller shaft and a rear axle is accommodated to communicate to an engine air pipe which is opened into the upper part of a chassis. CONSTITUTION:In a baggy tricycle 10, the output of an engine E is transmitted onto a rear axle through a propeller shaft which penetrates through a propeller shaft cylinder 32 in a rear fork assembly, final drive gear in a gear boxy 40, and a final trailing gear. In this case, onto the part where the propeller shaft cylinder 32 is continuous to the gear box 40, a vent hole 42 communicating to the inner chamber of the gear box is formed onto the upper wall of the gear box 40. While, a vent hole part is formed onto the upper wall of the crankcase of the engine E, and one edge of an engine air pipe 70 made of rubber is fitted. The other edge of the air pipe 70 is fitted into the upper-rank branched pipe of a four-way pipe joint 72, and one edge of a gear-box air pipe 48 made of rubber is fitted into the lower-rank branched pipe, and the other edge is fitted into the vent hole 42.
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