Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Honda Giken Kabushiki Kaisha

Musashi Seimitsu Industry Co., Ltd.

Hitoshi Yokotani

Yoshitsugu Gokan

Hiroatsu Inui

Hiroshi Sotani

Yoshitaka Nukada

Toru Kisaichi

Yosuke Hoi

Koji Inose

Go Morita

Shinya Koyama

Kohei Matsuura

Yutaka Inomoto

Takaaki Shomura

Ryuji Tsuchiya

Yoshio Izumi

Shinichiro Keyaki

Masaru Odajima

Michio Asumi

Kazuhiko Tomoda

Yasuhiro Morimoto

Yuichi Moriyama

Michio Izumi

Yusuke Takaishi

Satoshi Okayama

Teppei Maeda

Hiroyasu Yoshizawa

Yusuke Tomioka

Kosuke Sakasai

Jumpei Katsuta

Teruhisa Okamoto

A power unit has an internal combustion engine and a first auxiliary machine. The internal combustion engine includes a crankshaft and a balancer shaft. The first auxiliary machine operates on rotational power generated in the internal combustion engine. The first auxiliary machine is driven by rotational power of the balancer shaft.

Power unit

A vehicle includes a front wheel, a rear wheel, and a power unit. The power unit is disposed between the front wheel and the rear wheel in a front-rear direction of the vehicle. An internal combustion engine and a compressor are modularized. The compressor is configured to operate on rotational power generated in the internal combustion engine. The internal combustion engine includes a crankshaft and an output shaft. Rotation axes of the crankshaft and the output shaft are parallel to each other and extend in the front-rear direction of the vehicle. The compressor is disposed on one side of the crankshaft in a left-right direction. The output shaft is disposed on the other side of the crankshaft in the left-right direction.

Vehicle

An oil passageway structure for IC engines includes a generator provided on one end side of a crankshaft, a generator cover that covers the generator and is fixed to an engine crankcase, a protective cover provided outside the generator cover and a water pump attached to an outer surface of the protective cover and having a drive shaft coaxially connected to one end of the crankshaft. The generator cover includes oil passageways that supply engine oil from the crankcase to the generator, and a generator cover-side guide portion that flows out engine oil collected from a generator housing space housing the generator toward the protective cover, and the protective cover includes a protective cover-side guide portion that guides and supplies the engine oil flowing out from the generator cover-side guide portion to the drive shaft of the water pump.

Oil passageway structure for internal combustion engines

A cylinder head of an internal combustion engine includes a first exhaust port section having an upstream inlet opened and closed by a first exhaust valve, a second exhaust port section having an upstream inlet opened and closed by a second exhaust valve, and a collective exhaust port section into which the first and second exhaust port sections merge at downstream ends thereof. In a fixing structure for an exhaust gas sensor, the sensor is fixed to the collective exhaust port section with its sensing tip in the port section. An exhaust gas guide part is formed, at a position upstream of the sensor, on an internal wall of the port section, opposite the internal wall to which the sensor is fixed, so as to bulge out to guide exhaust gas toward the sensor, whereby exhaust gas is effectively intermixed and directed to the sensor with resultant increased sensing accuracy.

Fixing structure for exhaust gas sensor of internal combustion engine

An intake port is configured such that a center position of an intake upstream side opening is offset to one side in a juxtaposition direction of intake downstream side openings with respect to a center position between the intake downstream side openings in the juxtaposition direction as viewed in plan of a cylinder head. An injector is configured such that a fuel injection center axial line is inclined to the other side in the juxtaposition direction with respect to a center axial line of the intake upstream side opening as viewed in plan of the cylinder head.

Internal combustion engine

An internal combustion engine can include a first ignition plug disposed on the inner side of a range surrounded by a plurality of intake valves and a plurality of exhaust valves with a cylinder head viewed in parallel to a cylinder axial line and standing uprightly along the cylinder axial line. A second ignition plug is inclined with respect to the cylinder axial line on the outer side of the range. The second ignition plug is disposed on the opposite side to a valve driving mechanism with respect to the cylinder axial line on the outer side of the range.

An internal combustion engine including a transmission for transmitting power from a crankshaft to an output shaft through speed change, with the speed change in the transmission being performed by the driving of a speed change electric motor through a speed change drive mechanism, wherein power transmission control means for controlling the transmission of power from the crankshaft to the transmission is provided at one end of the crankshaft, and at least a part of the speed change electric motor and the speed change drive mechanism is disposed on the outside of the power transmission control means. This configuration of the internal combustion engine is reduced in size because of the layout of the speed change drive mechanism and the speed change electric motor.

To provide a clutch release mechanism which can restrain vibrations of a ball while allowing the ball to be loosely fitted when it is not in operation to ensure the engaged state of a clutch. A clutch release mechanism is configured in such a manner that a gap is defined between a clutch cam plate or a receiving plate and a ball unit so that the ball unit can slide between the clutch cam plate and the receiving plate. An urging spring is provided for urging the ball unit in the direction of being slid toward the clutch cam plate. A C-ring for restricting the ball unit from coming out from a boss member is attached to the peripheral portion of the boss member.

Clutch release mechanism

To enhance the responsiveness of a relief valve, to lower the height of an engine, and to remove foreign matter entrapped in oil. A cylindrical relief valve for a dry sump type engine is disposed in parallel to a main gallery which is disposed in parallel to a crank shaft. Alternatively, the relief valve is disposed in an oil tank. Furthermore, a strainer for straining oil recovered in the oil tank is provided in the oil tank.

Lubricating apparatus for dry sump type engine

An oil jet device for piston cooling in which no press-fitting device is required, and the O-ring is prevented from being broken. A filter plug is inserted into an oil passage opening from the crank journal of a crankcase toward the side of the lower portion of the cylinder, and the crank journal is sealed by a plain bearing being abutted against the filter plug. The oil passage is formed by ring-shaped feed paths formed in the ring-shape on the bearing portions on the plain bearing and the crankcase.

Oil jet device for piston cooling

To provide a system for lubricating an engine for a personal watercraft, which is capable of simplifying an oil piping structure. An oil pump driven by a crankshaft of an engine and a relief valve for controlling a discharge pressure of the oil pump are provided in an oil tank provided on an extension of the crankshaft of the engine. Suction/discharge passages and the like for the oil pump are provided integrally with a tank main body. An oil filter in communication with the oil pump is provided in an upper portion of the oil tank, and communication passages for the oil filter are provided integrally with the oil tank. The oil filter is aligned with an opening of a deck. The tank main body covers drive chambers for accessories such as an ACG, a balancer shaft, and a starter motor of the engine.

System for lubricating engine for personal watercraft

To provide a structure for stably supporting an engine in which front and rear portions of the engine are elastically supported. A drive pulley of a V-belt type transmission is mounted on an end portion of a crank shaft of the engine. A driven pulley of the V-belt type transmission is mounted to an input shaft of a gear box. The engine and the gear box are separately supported on the body side. A crank case of the engine is supported on the body side through a front side elastic mount and a rear side elastic mount disposed at front and rear portions. A ring bushing is fitted in a front side body mounting portion provided on a front portion of the crank case, and a mount rubber is fitted in a rear side body mounting portion. The front side elastic mount of the front side body mounting portion is higher in hardness than the rear side elastic mount of the rear side body mounting portion.

Engine supporting device for a vehicle

To make an intake apparatus and the inside of a boat body less likely to be contaminated with oil and to make an electric apparatus less likely to suffer from any trouble. A four-cycle engine having a head cover in which a breather exit is formed is carried in a boat body, and an oil storage portion when the boat is capsized is formed from the head cover. An upper face of the head cover is positioned close to and extends along a ceiling of the boat body, and the breather exit is provided above an upper face of oil stored in the head cover when the boat is capsized. A connection portion of the intake apparatus to a breather pipe is disposed below the breather exit. The head cover has a water drain path formed therein which connects to a plug mounting-dismounting hole and is opened to a peripheral face of the head cover rearwardly of the hole with respect to an advancing direction of the boat body. A water drain flow path is formed at a lowermost end portion of a bearing surface for a plug.

Saddle type small-sized boat

An arrangement for removably attaching a drive shaft of a track belt to an output shaft of a transmission allows the drive shaft to be mounted and removed easily and rapidly with respect to the output shaft. A driving pulley of a V-belt transmission is mounted on the right end of a crankshaft of an engine. A gear box is disposed proximately on the right side of a driven pulley of the transmission. An input shaft of the gear box supports the driven pulley. An input shaft, an idle shaft, and a final shaft are disposed in the gear box. The outer periphery of the output shaft is sealed with a seal. The output shaft is formed as a hollow shaft projecting and opening to one side of the gear box. The inner surface of the hollow output shaft is splined, and one end of the drive shaft is inserted into the hollow portion of the output shaft. Further, splines formed on the outer periphery of the one end of the drive shaft are brought into engagement with the splines formed on the inner surface of the output shaft. Thus, the splined connection permits rotation of the output shaft to be transmitted to the drive shaft, while allowing the drive shaft to be easily mounted to or removed from the output shaft.

Power transmission system

A power transmission system for a snowmobile reduces the weight thereof, and allows a streamlined body to be obtained. A drive side pulley of a V-belt transmission is mounted on a right end of a crankshaft of an engine. A gear box is disposed on the right side of a driven side pulley of the V-belt transmission at a position near the driven side pulley. The driven side pulley is fastened to an input shaft. Thus, the V-belt transmission and gear box are disposed on the same right side of the engine, so that the connecting shaft for connecting the V-belt transmission to the gear box is shortened and the weight thereof is reduced. Further, the V-belt transmission and the engine are disposed between a pair of right and left main frames, and the gear box is disposed outside of the right main frame, to thereby shorten a distance between the right and left main frames.

Growing community of inventors

Saitama, Japan

Hitoshi Yokotani