Kawasaki Jukogyo Kabushiki Kaisha

Atsushi Ueshima

Yoshiharu Matsuda

Takahiro Ono

Ryo Iwata

Hidenori Shinonaga

A crankcase for a multiple-cylinder four-cycle engine, including an upper crankcase and a lower crankcase which are joined to each other at a joint surface; a separating wall which is integrally cast with the upper crankcase and the lower crankcase to extend from the joint surface toward the opposite side of the joint surface and are configured to define crank chambers corresponding to adjacent cylinders; and a crank journal bearing hole which is formed on the separating wall and is configured to support a crankshaft. At least the separating wall formed in the upper crankcase has a thickness that increases from the joint surface of the crankcase to a region near a deepest portion of the crank journal bearing hole and decreases from the region near the deepest portion of the crank journal bearing hole toward the opposite side of the joint surface of the crankcase.

Crankcase, method of casting a crankcase, and a multiple-cylinder four-cycle engine comprising the crankcase

A vehicle combustion engine includes an engine cylinder block having an exhaust port defined in a front surface area thereof and fluidly connected with an exhaust tube. A transmission is arranged rearwardly of a crankcase. The vehicle combustion engine also includes at least one of an oil filter for filtering oil and an oil cooler for cooling the oil, which is positioned outside the cylinder block and the crankcase, but close to a lower portion of the cylinder block at a location rearwardly of the cylinder block.

Vehicle combustion engine

An exhaust system of an engine of a motorcycle, including an exhaust pipe configured to extend in one of an upward direction and a downward direction from an exhaust port formed at a front portion of a cylinder head of the engine and to then be bent to extend in an opposite direction to form a bent portion at a location in front of the engine.

Exhaust system of engine of motorcycle

There is provided an in-line multicylinder combustion engine of a type, in which the length and the width of the combustion engine can be reduced; which can be assembled compact in size with its center of gravity lowered in position; in which mass centering in the combustion engine can be accomplished, The engine (E) includes a crankshaft (), an input shaft () and an output shaft (). The crankshaft () is connected with the input shaft () through a clutch gear (). An imaginary plane (H) containing respective axes () of the crankshaft () and the input shaft () lies substantially horizontally, while the axis () of the output shaft () is positioned above the imaginary plane (H). An electric generator () having a drive gear () is positioned adjacent the center of gravity (G) defined between the crankshaft () and the output shaft (), with its generator longitudinal axis (C) positioned above another imaginary plane (M) connecting between the respective axes () of the crankshaft () and the output shaft (). The drive gear () of the electric generator () is meshed with the clutch gear ().

In-line multicylinder combustion engine

There is provided a lubricating device for a motorcycle combustion engine, which allows the motorcycle to exhibit a desired banking angle and also to have a lower center of gravity. The lubricating device is designed to supply a lubricant oil to an in-line multicylinder combustion engine (E) mounted on a motorcycle frame structure (FR) and having a crankcase (CR) and includes a main gallery () formed in a lower portion of the crankcase (CR) and journal oiling passages () branched off from the main gallery () for supplying the lubricant oil towards crank journals () of a crankshaft () of the engine. The main gallery () has opposite end portions () inclined to extend outwardly upwardly.

Growing community of inventors

Akashi, Japan

Atsushi Ueshima