Air-cooled internal combustion engine and saddle-riding vehicle equipped with the same
An internal combustion engine, air-cooled technology, used in air cooling, mechanical equipment, machines/engines, etc., can solve problems such as easy knocking and easy temperature rise, achieve sufficient cross-sectional area, reduce exhaust resistance, and improve cooling. Effect
Active Publication Date: 2017-09-22
YAMAHA MOTOR CO LTD
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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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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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There is provided an air-cooling type internal combustion engine including a cylinder head body which has a cooling air duct with a sufficient cross-sectional area and which can be suitably molded by die casting. An air-cooling type internal combustion engine according to the present invention 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 o 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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IPC IPC(8): F01P1/02
CPCF02F1/30F02F1/32F02F1/34
Inventor 铃木贵晴橘内透
Owner YAMAHA MOTOR CO LTD