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Engine

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

Active Publication Date: 2009-07-29
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] Figures 1 to 7 Examples of the present invention are shown.

[0022] First, to describe its construction, figure 1 The reference numeral 11 in the reference number represents the single-cylinder four-stroke four-valve engine that is arranged on the motorcycle as a saddle-shaped vehicle, and the engine 11 includes a cylinder head 16 fixed on the upper part of the cylinder block (omitted from the illustration), and the cylinder head 16 is equipped with Ventilation device 18, decompression device 19 and water pump device 20.

[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 ope...

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PUM

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Abstract

An object of the present invention is to provide an engine capable of compacting the space provided with the decompression device and the breather device. In the engine (11) of the present invention, the sprocket (32) that is surrounded by the cam chain (23) is fixed on the camshaft (22), and the ventilation rotating body (33) of the ventilation device (18) is fixed on the sprocket ( 23), the ventilation rotating body (33) includes a cylindrical annular portion (33a), and the decompression device (19) is arranged in 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 Patents(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