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Vibration-reducing type engine crankcase of motorcycle

A technology for crankcases and motorcycles, used in engine components, machines/engines, mechanical equipment, etc., can solve problems such as low tensile strength, and achieve the effects of improved structural strength, reduced weight, and increased heat dissipation area

Inactive Publication Date: 2009-04-08
重庆镁业科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: improve the structure of the existing motorcycle engine crankcase, design and manufacture a shock-absorbing motorcycle engine crankcase by using magnesium alloy materials, and overcome the high temperature creep and low tensile strength of magnesium alloy materials to reduce the vibration and noise of the motorcycle, reduce its weight, reduce its fuel consumption, and improve its ride comfort

Method used

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  • Vibration-reducing type engine crankcase of motorcycle
  • Vibration-reducing type engine crankcase of motorcycle
  • Vibration-reducing type engine crankcase of motorcycle

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Embodiment Construction

[0014] Taking the shock-absorbing motorcycle engine crankcase of the present invention which is die-cast with AZ91D magnesium alloy for LC150 / 125 models as an example, the improved structure of the present invention will be described in detail in conjunction with the accompanying drawings.

[0015] On the combined surface of the left crankcase body (see Figure 1), there is a 4mm-wide reinforcing rib near A bolt hole c and B bolt hole d, and between No. 1 front suspension hole f and crankshaft hole e There is a 5mm wide reinforcing rib between them, and a 5mm wide reinforcing rib is set at the No. 2 front suspension hole g, between the starting shaft hole q, the positioning pin hole n on the closing surface and the No. 2 rear suspension hole i Each is provided with a 4.5mm wide reinforcing rib.

[0016] On the cover surface of the left crankcase (see Figure 2), the wall thickness of the box within the radius of 100mm around the crankshaft hole e is 5mm, and the wall thickness o...

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Abstract

The invention belongs to combustion engine crank box, which is a crank box for the vibration damping motorcycle engine, made up of left crank box and the right crank box, the character lies in: the left and the right crank boxes use magnesium alloy to be cast and formed, the thickness of the box wall is 3.5-6mm, several reinforcing ribs with width of 3-5mm are arranged on the box surface and the cover. Compared to the gearing aluminum alloy crank box, when the structure intensity of the box is upgraded, the heat irradiating area is also increased, it can reduce the high temperature creep, the mechanical intensity of the magnesium alloy crank box in the high temperature environment is not affected; the experience to the same motorcycle LC125 testifies, the crank box of the invention caters all the demands of engine, and the weight is reduced, thus it can save 0.4l oil per hundred kilometers, the average heat vibration and noise only the 1 / 3 of the traditional crank box.

Description

1. Technical field [0001] The invention belongs to a crankcase of a combustion engine, in particular to a crankcase of a motorcycle engine. 2. Background technology [0002] Magnesium alloy materials have light specific gravity, good specific strength and rigidity, strong shock absorption performance, and good processing performance and thermal conductivity; for example, the shock absorption capacity of magnesium alloy AZ91D under a load of 35MPa is 25 times that of aluminum alloy A380. Therefore, magnesium alloy materials have been widely used in aerospace, transportation, information and communication industries. In the motorcycle manufacturing industry, magnesium alloys have been used in practical applications such as front and rear hubs, tail covers, and even engine side covers to reduce the weight of the car body and reduce fuel consumption. However, magnesium alloy materials creep under high temperature conditions above 150°C, reducing mechanical properties, and at th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F7/00
Inventor 曾德友章宗和罗章瑜周峰魏霞
Owner 重庆镁业科技股份有限公司
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