Honda Motor Co., Ltd.

Yutaka Kubota

Hideaki Takada

Tatsuya Kuroda

Kazutake Koyama

Akira Amano

Kazuyoshi Sato

Hiroshi Watanabe

Wataru Shimazaki

Mounting port, provided adjacent to a cooling water passageway, has a hole opening from the passageway for mounting an anode metal in the passageway. Lid member, which closes the outer end of the hole, has a head portion formed at its outer end and an externally threaded portion engageable with an internally threaded portion of the hole with a sealing member sandwiched therebetween. The lid member having the anode metal fixed thereto is inserted in and attached to the port with the threaded portions engaging with each other with a sealing tape sandwiched therebetween. Space is defined between an outer end portion of the port and an outer end portion of the lid member between the head portion and the externally threaded portion so that part of the sealing member protruding from between the threaded portions can be received in the space.

Sacrificial electrode mounting structure

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.

Gaskets are placed in joints between adjacent nonferrous metal engine members of a water-cooled engine for an outboard motor, such as a cylinder block, a cylinder head, a crankcase, a mount case and an oil pan, to seal the joints. Each of the gaskets has a base member formed of a stainless steel. The surfaces of the base member are coated with electrochemical corrosion preventing films formed by applying a liquid containing flakes of an aluminum alloy or a zinc alloy and a silicate resin in films and baking the films of the liquid. The electrochemical corrosion preventing films are coated with sealing films formed by applying a liquid containing aluminum flakes and a silicate resin to the electrochemical corrosion preventing films and baking the films of the liquid. The gaskets are prevented from electrochemically corroding despite potential difference between each gasket and the adjacent engine members.

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Wako, Japan

Yutaka Kubota