Yamaha Hatsudoki Kabushiki Kaisha

Takamitsu Suzuki

Minoru Yonezawa

Manabu Kobayashi

Kazuo Uchiyama

Takeshi Iwanami

A valve trains drive assembly for a V-type engine which includes a balancing shaft. The valve train includes a flexible transmitter between a crankshaft sprocket and one of two camshafts in the cylinder heads as well as a sprocket around the balancing shaft. Each of the camshafts that are driven directly by the crankshaft then drive the opposed camshaft within each cylinder head via a transmission. The transmissions within each cylinder head between camshafts may be located at the forward or at the rear end thereof. Both the intake camshafts, or both the exhaust camshafts, or a combination thereof may be directly driven by the crankshaft sprocket. An improved breather oil separator is positioned between the balancing shaft and an induction system.

Camshaft operating system

An improved compact induction system for a V type engine including a pair of plenum chambers disposed in the valley of the V. The plenum chambers are shorter than the respective cylinder banks and serve high speed intake passages of the respective cylinder bank and some longer, low speed intake passages of the adjacent cylinder bank and some low speed intake passages of the other cylinder bank. All of the low speed intake passages have the same length.

Induction system for V type engine

Several embodiments of supercharged V-type engines wherein at least one plenum chamber is provided that is disposed adjacent at least one of the banks of the cylinders. A supercharger is positioned at the transmission end of the engine and is interconnected with the plenum chamber through a relatively short conduit. In some embodiments, the supercharger is driven from the transmission and in other embodiments, the supercharger is driven from the opposite end of the engine. In one embodiment, there are a pair of plenum chambers, each disposed above a respective cylinder bank.

Supercharged motor vehicle

An improved induction system for a V type engine having angularly disposed cylinder banks that is comprised of a pair of plenum chambers that are disposed in side by side relationship between the cylinder banks. Intake passages extend at right angles from each plenum chamber through the other plenum chamber and serve an intake port of the opposed cylinder bank. The plenum chambers are staggered relative to each other so as to provide a void at one end of the engine in which an accessory is positioned. An intake device supplies air to the plenum chambers and it extends beneath them and is connected by fasteners which are accessible through removable covers of each of the plenum chambers.

Intake system for V type engine

Two embodiments of compact high performance induction systems for V type engines that include pairs of plenum chambers that extend over the respective cylinder banks. First pairs of runners extend from an inlet opening in each plenum chamber to an outlet opening that communicates with the cylinder of the opposite bank. Second pairs of intake passages are provided which extend from inlet openings in the respective plenum chambers to outlet openings in the cylinders of the adjacent cylinder head. The first intake passages have portions that extend through the other plenum chambers and the second intake passages communicate with the cylinders through these intermediate portions. The intermediate portions are curved and in one embodiment the second intake passages are tangential to these curved portions and in the other embodiment they are radial to it.

Engine induction system

A driving arrangement for a motor vehicle having a transversely disposed V-type four camshaft internal combustion engine. The camshafts are all driven in timed relationship with the crankshaft with a first flexible transmitter being operative to drive the intake camshafts of each cylinder bank at the same end of the engine from the crankshaft. The exhaust camshafts of each bank are driven by the intake camshafts at the opposite end of the engine.

Growing community of inventors

Iwata, Japan

Takamitsu Suzuki