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Four-air valve motorcycle engine valve clearance adjustment structure

A technology for engine valve and clearance adjustment, which is applied to engine components, machines/engines, mechanical equipment, etc., and can solve problems such as poor repeatability, low adjustment accuracy, and large elastic deformation of parts

Inactive Publication Date: 2008-11-05
JIANGMEN SINO HONGKONG BAOTIAN MOTORCYCLE INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this traditional valve clearance adjustment structure are: the repeatability of each adjustment is poor, the adjustment accuracy is mainly controlled by the operator, the subjectivity is strong, and the adjustment accuracy is relatively low; in addition, the transmission chain of this traditional valve clearance adjustment structure Long, the elastic deformation of each part is large, the rigidity is poor, and it is easy to produce large distortion when the movement law of the follower is transmitted to the valve
Especially when the engine is running at high speed, the inertial force caused by the high-speed movement will excite the vibration of the transmission mechanism and generate additional vibration load, thereby aggravating the dynamic deformation of the valve mechanism and affecting the performance of the engine

Method used

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  • Four-air valve motorcycle engine valve clearance adjustment structure
  • Four-air valve motorcycle engine valve clearance adjustment structure
  • Four-air valve motorcycle engine valve clearance adjustment structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: a kind of four-valve motorcycle engine valve clearance adjustment structure such as figure 2 shown, including:

[0016] - the cam 7 in the middle of the engine cylinder,

[0017] ——The intake rocker arm 8 is positioned on and moves around the intake rocker shaft 9, the active end of the intake rocker arm 8 is connected to the engine cam 7, and the output end of the intake rocker arm 8 is as follows image 3 As shown, it is a Y-shaped bifurcation, and the ends of the two bifurcations respectively drive an intake valve stem 14, and the upper top of the intake valve stem 14 is fixed with a threaded connection. Valve clearance adjusting gasket 10. The output end of the intake rocker arm 8 is arc-shaped and directly contacts the upper plane of the intake valve clearance adjustment gasket 10, and the surface roughness of the contact surface between them is Ra0.050.

[0018] ——The exhaust rocker arm 11 is positioned on and moves around the exhaust rocker shaf...

Embodiment 2

[0019] Embodiment 2: a kind of four-valve motorcycle engine valve clearance adjustment structure such as Figure 4 As shown, it is mainly on the basis of the above-mentioned embodiment 1, mainly changing the contact mode between the intake and exhaust valve rocker arms and the intake and exhaust valve clearance adjustment gaskets. details as follows:

[0020] Take the intake valve transmission structure as an example (the exhaust valve transmission structure is similar), such as Figure 5 As shown, the upper top of the intake valve rod 14 is fixed with mortise and rivet interference fit-an intake valve clearance adjustment gasket 10 with a corresponding specific height with a hemispherical top surface according to different intake valve clearance requirements. The output end of the intake rocker arm 8 cooperates with the spherical shape of the intake valve clearance adjustment gasket 10 to be provided with a semi-concave spherical pit, so that the output end of the intake roc...

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PUM

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Abstract

A four-valve motorcycle engine valve clearance adjusting structure comprises a valve rocker with one end driven by cam; output end of the valve rocker drives the valve rod; upper end of the valve rod is installed with valve clearance adjusting gasket; output end of the valve rocker is directly contacted with the valve clearance adjusting gasket to drive the valve rod. The present invention skillfully uses the different thicknesses of the corresponding valve clearance adjusting gaskets to adjust the clearance between the rocker and the valve according to the valve clearances between each valve. This structure leads the transmission mechanism of the motorcycle to be simpler and compacter, the transmission link of the movement rule be less and is able to reduce the elastic deformation and transferring error of the whole mechanism. Because the valve rocker which is directly transfers with the output end of the valve rocker is a valve rocker with better rigidity and intensity, the rigidity of the whole transmission mechanism is greatly improved, the additional vibration load is greatly reduced; the invention is able to improve the rotating speed, increase the power and is good for improving the motivity of the whole generator.

Description

technical field [0001] The invention relates to a valve clearance adjustment structure of a motorcycle engine, in particular to a valve clearance adjustment structure of a small-sized forced air-cooled four-valve motorcycle engine. Background technique [0002] The gas distribution mechanism is the key component for the drive and operation of the engine's intake and exhaust moving parts, which directly affects the engine's charging efficiency, pumping loss, and air exchange quality, so it has a great impact on the engine's power, economy, and emission performance. Impact. [0003] The traditional motorcycle engine valve clearance adjustment structure is generally as follows: figure 1 As shown, the cam 5 drives the valve rocker arm 4 that moves around the rocker shaft 3, and the other end of the valve rocker arm 4 is provided with an internally threaded through hole, and the valve adjusting screw 1 matching the internally threaded hole is screwed into the internally threaded...

Claims

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Application Information

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IPC IPC(8): F01L1/20
Inventor 庾永曦
Owner JIANGMEN SINO HONGKONG BAOTIAN MOTORCYCLE INDAL
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