Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Takanori Osuka

Hiroatsu Inui

Toshifumi Osawa

Masaaki Negoro

Hiroshi Tadokoro

Toshio Yamamoto

Masaki Cho

Masashi Koyanagi

Ryuichi Abe

Masahiko Nakatsuka

Tomiyuki Sasaki

Tomoyuki Takewaka

Atsuo Hojo

Norihiko Sasaki

Tsuyoshi Arima

Shuichi Ochiai

Junichi Ishida

Yuki Takano

Tomokazu Nomura

Yosuke Ariga

Seiichi Nishihira

Hiroatu Inui

A cylinder head cover structure of a vehicle which can shorten a longitudinal length of a vehicle while avoiding the restriction on the layout of an engine. A motorcycle includes a vehicle body frame, an engine which is mounted on the vehicle body frame in a suspended manner and includes a cylinder head cover and a radiator which is arranged in front of the engine and behind a front wheel. A recessed portion which is recessed toward a rear side of the vehicle is formed in the cylinder head cover so as to allow a lower portion of the radiator to enter the recessed portion.

Cylinder head cover structure of miniaturized vehicle

An engine for a vehicle can include an oil pan coupled to a lower portion of a crankcase, and a partition wall configured to partition a crank chamber in the crankcase and the oil pan. The partition wall can be disposed on the crankcase, and can include openings configured to return oil from a crank chamber side to an oil pan side. Bridges are configured to suppress back flow of the oil from the oil pan side to the crank chamber side. The bridges can be fixedly disposed below the openings so as to cover at least part of the openings from below.

Engine for a vehicle

An internal combustion engine includes an intake passage structure. The engine is configured such that a cylinder head is formed integrally with an intake manifold portion. A cylinder central axis is oriented parallel to an extending direction of an intake passage, when viewed in a side view. An injector is arranged such that it does not interfere with peripheral components, including the intake passage and a throttle body. The injector is disposed in the intake manifold portion such that a leading end thereof is oriented towards the intake valve of the cylinder head. The intake passage on the upstream side of an injector attachment position is offset from the injector in a width-direction of the internal combustion engine.

Intake passage structure for internal combustion engine, and engine and vehicle incorporating same

A motorcycle includes an engine configured to expel an exhaust from combustion chambers of cylinders in a cylinder head through exhaust ports. Each of the cylinders is provided with a recessed portion provided in an exhaust passage wall surface in a central portion of an exhaust passage of a corresponding exhaust port. This makes it possible to maintain flow rate and flow velocity of the exhaust gas, and to decrease exhaust loss. As a result, it is possible to increase engine torque by use of a simple structure. In addition, no restriction is imposed on the layout of parts around the engine, because the recessed portions are provided in the exhaust ports.

Cylinder head for an internal combustion engine, engine incorporating the cylinder head, and method of making same

A torque shock or vibrations caused by the rotary inertia of a hydrostatic continuously variable transmission is reduced to improve ride quality of a vehicle when excessive torque occurs in a torque transmission path between a crankshaft and a drive wheel. A motorcycle includes a hydrostatic continuously variable transmission rotatably driven by torque of a crankshaft of an internal combustion engine. A rear wheel is rotatably driven by torque from the transmission. A torque damper absorbs excessive torque occurring in a torque transmission path from the crankshaft to the rear wheel. The torque dampers include an input side torque damper disposed in an input side torque transmission path between the crank shaft and the transmission and an output side torque damper disposed in an output side torque transmission path between the transmission and the rear wheel.

Vehicle provided with torque damper

An internal combustion engine includes an oil storage structure defining an oil storage chamber provided for storing oil therein. The engine is configured such that a crankcase cover, covering a clutch mechanism, is joined to a crankcase for forming an oil storage chamber. The oil storage structure is applied to an engine having a vertically split crankcase, and is configured to prevent the clutch mechanism from dipping into stored oil so that clutch disengagement performance is not affected, and reliability of the liquid-tight sealing performance is extended. The crankcase cover is formed with a partition wall extending along the outer circumference of the clutch mechanism. The partition wall splits a space between the crankcase and the crankcase cover into two chambers. Of these chambers, a chamber separate from a clutch mechanism is used as the oil storage chamber, which is formed only by a lower crankcase and the crankcase cover.

Oil storage structure for engine, engine incorporating same, and vehicle incorporating same

A reed valve having a plate shaped support substrate with a valve hole formed in a central section passing through in a plate thickness direction is provided. A flexible plate-shaped reed covering the valve hole at one surface of the support substrate and having one end in a longitudinal direction that is fixed to the support substrate. The support substrate has a rib extending along a center line in a longitudinal direction of the inside of the valve hole, to divide the valve hole into two spaces. A surface of the rib opposite to the reed is positioned on substantially the same plane as a surface of the support substrate to which the rib is attached, and is adjacent to the reed.

Reed valve and reed valve assembly

A lubricating structure for an OHC internal combustion engine including a cam holder, wherein an oil feed path for feeding a lubricant to an upper end of a valve stem is formed integrally with the cam holder so as to project therefrom.

Lubricating structure of OHC internal combustion engine

To provide a bearing device for a rotary shaft which can further restrain the damage to a sliding bearing, by determining the position of a parting surface of the sliding bearing taking into account the position of the maximum pressure of an oil film. A bearing device includes a pair of sliding bearings for rotatably bearing a crankshaft of an internal combustion engine, and an oil supply passage for supplying a lubricating oil into clearances between the crankshaft and the sliding bearings. The sliding bearings are composed of bearing halves bisected at a parting surface located on a flat plane, substantially orthogonal to the direction of the maximum pressure of the oil films, formed of the lubricating oil in the clearances. The bearing device is applicable to an internal combustion engine including a cylinder having an inclined cylinder axis, which reduces the vibration and noise of the internal combustion engine.

Growing community of inventors

Saitama, Japan

Takanori Osuka