Air-cooling type internal combustion engine and saddled vehicle having the same

An internal combustion engine, air-cooled technology, applied in the direction of mechanical equipment, air cooling, engine cooling, etc., can solve the problems of easy temperature rise, easy knocking, etc., achieve sufficient cross-sectional area, reduce exhaust resistance, and improve cooling performance Effect

Active Publication Date: 2014-04-09
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the compression ratio is increased, the temperature near the top dead center of the piston tends to rise, and knocking tends to occur

Method used

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  • Air-cooling type internal combustion engine and saddled vehicle having the same
  • Air-cooling type internal combustion engine and saddled vehicle having the same
  • Air-cooling type internal combustion engine and saddled vehicle having the same

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Embodiment Construction

[0095] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments.

[0096] figure 1 The saddled vehicle 1 in this embodiment is shown. figure 1 The saddled vehicle 1 shown is a scooter-type motorcycle. It should be noted that the straddle type vehicle of the present invention is not limited to the scooter type motorcycle 1 . The straddle type vehicle of the present invention may be other types of motorcycles such as so-called motor bicycle type, off-road type, and truck. Furthermore, the straddle type vehicle of the present invention means any vehicle in which a passenger straddles the vehicle, and is not limited to a two-wheeled vehicle. The saddled vehicle of the present invention may be a tricycle in which the direction of travel is changed by tilting the vehicle body, or may be other saddled vehicles such as ATV (All Terrain Vehicle).

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Abstract

The present invention relates to an air-cooling type internal combustion engine and a saddled vehicle having the same. The air-cooling type internal combustion engine includes a cylinder head body (100), the cylinder head body (100) including: a plurality of cooling fins (10); a cam chamber wall (20) defining a cam chamber (109); a combustion chamber wall (30) defining a combustion chamber (110); an intake duct (40) through which air intake into the combustion chamber (110) is to occur; an exhaust duct (50) through which exhaust from the combustion chamber (110) is to occur; and a cooling air duct (60) for allowing cooling air to pass through the cam chamber wall (20) and the combustion chamber wall (30). The cylinder head body (100) is integrally molded from an aluminum alloy by die casting. The cylinder head body (100) further includes a cam chain chamber (70) for accommodating a cam chain (113). When viewed in the cylinder axis direction (D1), the exhaust duct (50) extends in such a manner that the exhaust duct (50) becomes more distant from the cam chain chamber (70) when going from the inlet side toward the outlet side, and the exhaust duct (50) is formed so that an axis (50x) of the exhaust duct (50) is linear.

Description

technical field [0001] The present invention relates to internal combustion engines, and more particularly to air-cooled internal combustion engines. Furthermore, the present invention also relates to a saddled vehicle including an air-cooled internal combustion engine. Background technique [0002] In recent years, there has been an increasing desire to operate internal combustion engines at higher compression ratios in order to improve fuel efficiency. However, when the compression ratio is increased, the temperature near the top dead center of the piston tends to rise, and knocking tends to occur. [0003] In order to prevent such knocking, it is necessary to improve the cooling performance of the cylinder head. In general, an air-cooled internal combustion engine tends to have lower cooling performance than a water-cooled internal combustion engine. Therefore, especially in an air-cooled internal combustion engine, further improvement in cooling performance of the cyli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01P1/02
CPCF02F1/32F02F1/34F02F1/30
Inventor 铃木贵晴橘内透
Owner YAMAHA MOTOR CO LTD
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