Honda Motor Co., Ltd.

Kazutake Koyama

Hideaki Takada

Tatsuya Kuroda

Yutaka Kubota

Teruyuki Saitoh

Yutaka Tabata

Masahiro Yonemura

A plastic fuel tank having polyethylene layers is disclosed. The polyethylene layer positioned as the outermost layer of the plastic fuel tank is a high-density polyethylene layer admixed with an ultraviolet inhibitor for minimizing transmission of ultraviolet light.

Plastic fuel tank

A plastic fuel tank is disclosed including polyethylene layers laminated respectively onto an upper surface and a lower surface of an ethylene/vinyl alcohol layer for preventing fuel seepage. The outermost polyethylene layer laminated onto the upper surface is a high-density polyethylene layer colored black so as to minimize transmission of ultraviolet light.

A vertical internal combustion engine E has a crankshaftenclosed in a crank chamber, a belt-drive transmission mechanismheld in a belt chamberand including a rubber beltfor transmitting power of the crankshaftto a camshaftin a valve train, and a transmission casedefining the belt chamber. The belt chambercommunicates with the crank chamberby way of vent holesand, the transmission caseis provided with an internal wall Wdisposed between the vent holesandand the beltin the belt chamberto deflect the flow of an oil-containing gas flowing from the crank chamberinto the belt chambersuch that the oil-containing gas flows in directions deviating from a direction toward the belt. The beltis lubricated with oil in the oil-containing gas. The beltis prevented from being excessively exposed to the oil-containing gas from the crank chamberto extend its life.

Vertical internal combustion engine provided with belt-drive transmission mechanism

A vertical internal combustion engine includes a crankshaft enclosed in a crank chamber, a belt-drive transmission mechanism held in a belt chamber and including a rubber belt for transmitting power of the crankshaft to a camshaft included in a valve train, and a transmission case defining the belt chamber. The transmission case has a lower case between the crank chamber and the belt chamber. The belt has a part extending over the crank chamber, and the lower case is disposed to screen the part of the belt from the crank chamber. The belt is lubricated by oil in oil-containing gas from the crank chamber. Thus the oil containing gas is prevented from excessively contacting the rubber belt, so that the life of the belt is extended.

A vertical internal combustion engine E is incorporated into an outboard motor or the like. The vertical internal combustion engine E includes a crankshaftenclosed in a crank chamber, and a belt-drive transmission mechanismincluding a rubber beltfor transmitting power of the crankshaftto a camshaft, and held in a belt chamber. The belt chamberis isolated from the crank chamberby a lower caseof a transmission caseholding the belt-drive transmission mechanismtherein such that the flow of an oil-containing gas from the crank chamberdeviates from a direction toward the belt. The beltis lubricated with oil injected concentratedly into the belt chamberthrough jet nozzlesdisposed in the belt chamber. Thus the excessive exposure of the beltto the oil-containing gas from the crank chamber can be avoided, the life of the belt can be extended and the belt is lubricated properly.

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Wako, Japan

Kazutake Koyama