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Engine

An engine and rotating part technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve problems such as enlargement

Active Publication Date: 2006-08-16
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this conventional engine has a problem that the space where the decompression device and the breather device are provided becomes large on the cylinder head side because the decompression device is provided on the sprocket for the cam chain on the camshaft inside, and the breather is provided on the outside of the sprocket

Method used

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Embodiment Construction

[0020] Embodiments of the present invention will be described below.

[0021] 1 to 7 show an embodiment of the invention.

[0022] First, its construction will be described. Reference numeral 11 in FIG. 1 denotes a single-cylinder four-stroke four-valve engine provided on a motorcycle as a saddle vehicle, and the engine 11 includes a cylinder head fixed to an upper portion of a cylinder block (illustration omitted). 16. A breather device 18, a decompression device 19 and a water pump device 20 are installed on the cylinder head 16.

[0023] More specifically, a camshaft 22 is rotatably provided on the cylinder head 16, the camshaft 22 is connected to a crankshaft (not shown) through a cam chain 23 serving as a wound (flexible) transmission belt, the camshaft 22 is The chain 23 rotates with the rotation of the crankshaft.

[0024] The camshaft 22 rotates so that the exhaust and intake valves 24, 25 are opened and closed with predetermined timing. The camshaft 22 is construct...

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PUM

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Abstract

It is an obj ect of the invention to provide an engine capable of making a space, in which a decompression device and a breather device are arranged, compact. In an engine 11 of the invention, a sprocket 32, around which a cam chain 23 is trained, is fixed to a camshaft 22, a breather rotating body 33 of a breather device 18 is fixed to an outside of the sprocket 32, the breather rotating body 33 comprises a cylindrical-shaped annular portion 33a, and a decompression device 19 is arranged inside the annular portion 33a.

Description

technical field [0001] The invention relates to an engine provided with a decompression device and a breather device. Background technique [0002] Generally, for an engine used for a vehicle, etc., a camshaft is provided on one side of the cylinder head for opening and closing the intake and exhaust valves, and a decompression device is provided along the axial direction of the camshaft for when When the combustion chamber needs to be compressed, open the intake valve or exhaust valve to release the pressure in the combustion chamber, so as to eliminate the resistance during compression. A ventilation device is arranged along the axial direction of the camshaft to separate oil and gas ( See, for example, JP-A-04-298617 and JP-A-05-156917). [0003] However, this conventional engine has a problem that the space where the decompression device and the breather device are provided becomes large on the cylinder head side because the decompression device is provided on the sproc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01M13/04
Inventor 井上隆司增田辰哉田中章太郎
Owner YAMAHA MOTOR CO LTD