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Crankshaft of automobile engine

An automobile engine and crankshaft technology, applied in the crankshaft and other directions, can solve the problem of not being able to adapt to the load of a large-displacement automobile engine, and achieve the effects of good mechanical properties, high toughness and fatigue strength, and cost reduction.

Inactive Publication Date: 2009-01-14
CHERY AUTOMOBILE CO LTD
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  • Abstract
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Problems solved by technology

However, the mechanical property of its highest grade and best performing ductile iron is the tensile strength σ b >900MPa, yield strength σ s ≥600MPa, elongation δ≥2%, still cannot fully meet the load requirements of the crankshaft, especially the load of large-displacement automobile engines

Method used

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  • Crankshaft of automobile engine

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Embodiment approach

[0014] In order to achieve the above object, the technical solution taken by the present invention and its corresponding specific implementation are as follows:

[0015] The automobile engine crankshaft provided by the present invention adopts cast iron material, and the key is that the cast iron material adopts a material strengthening process. The method is that ordinary nodular cast iron becomes Aube nodular cast iron through austempering heat treatment, and its matrix structure is upper bainite and residual austenitic Tensile body, the spheroidization grade of the as-cast rough is 1 to 2 grades, and the diameter of graphite balls is above 6 grades.

[0016] High-strength, high-toughness Aubeite nodular cast iron has superior comprehensive mechanical properties, and at the same time, the cost is lower than steel, and the blank manufacturing and cutting are convenient. Its material performance index is: tensile strength σ b >1050MPa, yield strength σ s ≥750MPa, elongation ...

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Abstract

An engine crankshaft of automobile is prepared from cast iron material. It features that material intensifying process is applied on said cast iron material i.e. utilizing isothermal hardening heat treatment to process normal graphite cast iron to be austenit-bainite graphite cast iron and making cast-state blank bailing grade be 1-2 grade as well as making graphite ball diameter be above 6grade.

Description

technical field [0001] The present invention relates to an automobile chassis, and more particularly, the present invention relates to an automobile engine crankshaft. Background technique [0002] The crankshaft is one of the most important parts in the crank-and-rod machinery of an automobile engine. It cooperates with the connecting rod to convert the combustion gas pressure acting on the top of the piston into the power of the crank rotation, which is then transmitted to the transmission mechanism of the chassis. At the same time, drive the gas distribution mechanism and other auxiliary devices, such as fans, water pumps, generators, etc. Due to the variable-speed reciprocating motion of the piston, the rotational motion of the crankshaft and the compound motion of the connecting rod, each component, especially the crankshaft, is subject to high-frequency, alternating tension, compression, shear, torsion, vibration, friction and other complex stresses. When these stress...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C3/06
Inventor 朱航徐弋谦
Owner CHERY AUTOMOBILE CO LTD
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