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engine and vehicle

An engine and valve mechanism technology, applied in engine components, machines/engines, mechanical equipment, etc., to solve problems such as camshaft enlargement

Active Publication Date: 2017-12-08
YAMAHA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that the camshaft including the decompression mechanism becomes larger in the axial direction

Method used

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  • engine and vehicle
  • engine and vehicle
  • engine and vehicle

Examples

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Embodiment Construction

[0036] Hereinafter, a vehicle 1 according to the embodiment will be described with reference to the drawings. figure 1 is a side view of the vehicle 1 . The vehicle 1 is a scooter type motorcycle. The vehicle 1 includes a vehicle body 2 , front wheels 3 , rear wheels 4 , handlebars 5 , and seats 6 . The vehicle body 2 includes a flat step 2a. The vehicle body 2 supports front wheels 3 and rear wheels 4 . The handlebar 5 and the seat 6 are attached to the vehicle body 2 . The flat step 2 a is arranged in front of and below the seat 6 .

[0037] Vehicle 1 includes engine 7 of the embodiment. figure 2 is a partial sectional view of the engine 7 . Such as figure 2 As shown, the engine 7 includes a crankshaft 11 , a crankcase 12 , a cylinder block 13 , a cylinder head 14 and a head cover 19 . The cylinder block 13 is connected to the crankcase 12 . The cylinder block 13 may be integral with the crankcase 12, or may be a separate body. The cylinder block 13 accommodates ...

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Abstract

A decompression mechanism is disposed between both ends of a cam shaft in the axial direction of the cam shaft. The decompression mechanism includes a weight and a decompression cam. The weight is supported in a rotatable manner on the cam shaft. The decompression cam switches between a state of coming into contact with a valve mechanism and a state of not coming into contact with the valve mechanism in response to the rotation of the weight. The weight includes an inner ring contact portion. The inner ring contact portion is disposed in line with an inner ring of a bearing in the axial direction of the cam shaft. The inner ring contact portion is located on the inside in the radial direction of the inner peripheral surface of an outer ring of the bearing.

Description

technical field [0001] The present invention relates to an engine and a vehicle including a decompression mechanism. Background technique [0002] When starting the engine, the engine needs to be rotated by external force until the start is completed. For example, there are methods of turning it by starting a motor and / or turning it by a recoil starter. On the other hand, during the compression stage of the engine, the air in the cylinder is compressed, so the resistance to rotation increases. In order to reduce such resistance, there is known a decompression mechanism for reducing the pressure in the cylinder during the compression stage when the engine is rotated by external force. [0003] For example, the decompression mechanism disclosed in Japanese Patent Application Laid-Open No. 2008-128171 includes a decompression cam that is switched between an active state and a decommissioned state by rotation of a counterweight. The decompression mechanism is supported by a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L13/08
CPCF01L1/053F01L1/181F01L1/20F01L13/085F01L2001/0476F01L2001/0535F01L2305/00F01L2820/035
Inventor 桥本秀明原千寻
Owner YAMAHA MOTOR CO LTD