Yamaha Hatsudoki Kabushiki Kaisha

Manabu Kai

Takashi Ashida

Akihiko Nakamura

Tokinari Nagao

Atsushi Sawabuchi

Mamoru Atsuumi

A vehicle includes a frame supporting an engine, a transmission including an input shaft and an output shaft, a driving device linked to the output shaft so that power is transmitted therebetween, and a supercharger including a rotation shaft linked to the output shaft so that power is transmitted therebetween. The supercharger is fixed to the frame.

Vehicle

A vehicle includes a transmission including an input shaft linked to a crankshaft of an engine so that power is transmitted therebetween, and an output shaft which is able to rotate at a rotational speed lower than a rotational speed of the input shaft. The snowmobile includes a driving device linked to the output shaft so that power is transmitted therebetween to generate a driving power, a supercharger including a rotation shaft linked to the output shaft so that power is transmitted therebetween, and a centrifugal clutch located between the crankshaft and the input shaft or between the output shaft and the rotation shaft.

A snowmobile has a structure that reduces and minimizes adverse affects of snow on a throttle motor. The snowmobile includes a snowmobile body including an engine room therein, an engine which is disposed inside the engine room, a throttle valve arranged to adjust intake air supplied to the engine, a throttle motor arranged to drive the throttle valve and disposed ahead of the engine, and an air box arranged to pass the intake air through toward the engine, disposed ahead of the engine and including a portion located ahead of the throttle motor.

Snowmobile

A land vehicle, such as a snowmobile, comprises a frame with an engine mounted to the frame. The frame is supported by at least one steerable member. The steerable member is controlled by a rider with a steering handle. The engine comprises a decompression mechanism to lower the compression ratio during starting, for instance. The decompression mechanism is actuated by an actuator mounted outside of an engine compartment in which the engine is mounted. The actuator can be a steering handle mounted lever. The decompression mechanism can be mounted on a cylinder head of the engine. In one arrangement that allows the mechanism to control compression in multiple cylinders, the mechanism can be mounted between adjacent exhaust ports of adjacent cylinders.

Decompression arrangement for land vehicle

An air/fuel ratio control for an internal combustion engine which adjusts the fuel supply amount in response to correction factors dependent upon altitude and engine speed and altitude and engine load. In this way, it is not necessary to provide over-enriching of the fuel/air ratio to avoid over-heating when high altitude or low atmospheric pressure conditions prevail.

Air-to-fuel ratio control unit for internal combustion engine

An engine operational control unit for an internal combustion engine which protects an engine in the event of abnormal condition of the throttle mechanisms by discontinuing operation of the ignition or the ignition and fuel injection dependent upon engine speed. In this way, the engine is protected from overheating if operating at a high speed, and from wetting or fouling of the spark plugs if operating at a lower speed, if abnormal conditions prevail.

Growing community of inventors

Shizuoka, Japan

Manabu Kai