Yamaha Hatsudoki Kabushiki Kaisha

Akitoshi Nakajima

Toshinori Inomori

Tsuneo Isobe

Tsuyoshi Kubota

Shinya Iwasaki

Hideki Fujiwara

Satoshi Kikuchi

A single-cylinder internal combustion engine includes a knock sensor mounted thereto to suppress a temperature increase of the knock sensor and at the same time detect knocking with high accuracy. The engine includes a cylinder block having a cylinder provided therein, and a cylinder head connected to the cylinder block. On a surface of the cylinder block and the cylinder head, one or more fins protruding from the surface are provided. On the surface of the cylinder block, a sensor mounting boss protruding from the surface and being continuous with a portion of the one or more fins is provided. A knock sensor arranged to detect knocking is mounted to the sensor mounting boss.

Internal combustion engine and straddle-type vehicle equipped with the engine

In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented, and the reliability of the knock sensor is improved. The engine includes a crankcase, a cylinder block connected to the crankcase, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, and a knock sensor mounted to the boss. Fins are provided on the cylinder block and the cylinder head. A heat insulation member is provided between the boss and the knock sensor.

In a single-cylinder internal combustion engine fitted with a knock sensor, a temperature increase of the knock sensor is suppressed and prevented and the reliability of the knock sensor is improved. The engine includes a crankcase accommodating a crankshaft, a cylinder block connected to the crankcase and including a cylinder provided therein, a cylinder head connected to the cylinder block, a sensor mounting boss provided on the cylinder block, a knock sensor arranged to detect knocking and mounted to the boss, a fan to guide air to at least the sensor mounting boss, and an air shroud.

A single-cylinder internal combustion engine includes a knock sensor mounted to apart other than a cylinder block to detect knocking. The engine includes a crankcase, a cylinder block, and a cylinder head connected by a bolt. A boss to mount the knock sensor is provided on the crankcase. A center of the boss is positioned on a same side of a cylinder axis as the bolt, when viewed in an axial direction of the boss.

A split type connecting rod has a simple structure that is capable of suppressing rotation of a metal bearing, and avoiding problems such as burning. The split type connecting rodholds a crank-pin through a metal bearingwhich has locking lugs. A bearing locking groovelocks at least one of the locking lugswhen the metal bearingrotates forward in the circumferential direction of a crank-pin hole. A bearing locking groovelocks at least one of the locking lugswhen the metal bearingrotates backward. The bearing locking groovesare deviated from each other in the circumferential direction.

Split type connecting rod

A motorcycle and specifically an improved compact air inlet device and filter assembly for a motorcycle. The air inlet device is provided with a relatively large volume but an irregular shape to permit positioning in the area over the engine and beneath the fuel tank. By utilizing a horseshoe-shaped filter element, however, a large filter surface area may be achieved so as to reduce service intervals and to ensure that the engine will operate without flow restriction for a long period of time even if the filter element is not serviced.

Growing community of inventors

Shizuoka, Japan

Akitoshi Nakajima