Engine ductile iron crankshaft

A nodular cast iron, engine technology, applied in the direction of the crankshaft, etc., can solve the problems of fatigue resistance and low bending resistance, and achieve the effect of enhancing the bending fatigue resistance and improving the fatigue strength

Active Publication Date: 2010-01-13
TIANRUN IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it is well known in the art that nodular cast iron has good comprehensive mechanical properties, its fatigue resistance and bending resistance are inferior to forged steel, so simply replace forged steel with nodular cast iron to produce crankshafts directly, and the structure of the crankshaft itself Without corresponding adjustments or changes, the ductile iron crankshaft produced in this way cannot meet the technical requirements of users

Method used

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  • Engine ductile iron crankshaft
  • Engine ductile iron crankshaft
  • Engine ductile iron crankshaft

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The cast iron is smelted in an induction furnace, and the chemical composition of the cast iron is as follows after being spheroidized with rare earth magnesium with Re:Mg>1:

[0025] C: 3.91%, Si: 2.3%, Mn: 0.48%, P: 0.03%, S: 2%, Cu: 0.55%.

[0026] The nodular cast iron treated above was cast into a WD615 crankshaft blank, the spheroidization level was 2, the ball diameter was 6, and the pearlite content was 91%.

[0027] After the above blank is machined, it is normalized in stages: heat preservation at 910-920°C for 30 minutes; furnace cooling to 820°C, heat preservation for 1 hour; air cooling after coming out of the furnace.

[0028] The size of the crankshaft after machining, the diameter d1 of the front journal 11 of the free end 1 and the diameter d2 of the inner journal 12 are 52.4mm and 53mm respectively. Compared with the same type of forged steel crankshaft, the diameter of the front journal 11 The diameter increases by 9.2%, and the diameter of the journ...

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Abstract

The present invention provides an engine crankshaft made of ductile iron for replacing a same type forged steel crankshaft. Compared with the same type forged steel crankshaft, the diameter of the front end shaft journal of the free end of the engine crankshaft made of ductile iron of the present invention is increased by 7-12%, the diameter of the inner end shaft journal is increased by 408%; the radius of the transition round angle at the connection place between the free end and the main shaft journal; the crank arms of the crankshaft made of ductile iron are symmetrically double lug shape extending to the outside from the left and the right, the maximum width of the double lug shape place is increased by 20-40% more than the maximum of corresponding part of same type forged steel crankshaft. The surface of the crankshaft made of ductile iron of the invention is processed with nitriding treatment by glow plasma; the increased transition round angle place, the main shaft journal and the connection rod journal are processed with rolling treatment. The life of the crankshaft made of ductile iron of the invention is equal to or higher than the life of the same type forged steel crankshaft.

Description

technical field [0001] The invention relates to an engine crankshaft, in particular to a ductile iron crankshaft. Background technique [0002] Modern heavy truck engine crankshafts, especially WD 615 series crankshafts, are mostly made of forged steel, such as No. 45 high-quality carbon steel or 42CrMo alloy steel. Although forged steel has excellent fatigue resistance and bending resistance, the processing technology of forged steel crankshaft is relatively complicated, with low production efficiency and high cost. Therefore, those skilled in the art have always expected to use ductile iron with better comprehensive mechanical properties to replace forged steel to produce crankshafts, especially WD 615 series crankshafts. Although it is well known in the art that nodular cast iron has good comprehensive mechanical properties, its fatigue resistance and bending resistance are inferior to forged steel, so simply replace forged steel with nodular cast iron to produce cranksh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C3/08
Inventor 王传杰侯波慈惟红
Owner TIANRUN IND TECH CO LTD
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