Timing belt wheel for battery electric vehicle engine crankshaft and manufacturing method of timing belt wheel
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A pure electric vehicle, timing pulley technology, applied in belts/chains/gears, mechanical equipment, components with teeth, etc., can solve the problems of short service life, poor tooth strength, easy failure, etc. The effect of abrasiveness, improving strength and prolonging service life
Inactive Publication Date: 2016-01-13
TAIZHOU KECHENG AUTOMOBILE PARTS
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Abstract
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Problems solved by technology
The disadvantages of the existing car engine timing sprockets are: the strength of the teeth is poor, it is easy to fail, and the service life is short
Method used
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Embodiment 1
[0033] By weight, nickel powder 1.75, molybdenum powder 0.5, copper powder 1.5, chromium powder 1.7, manganese powder 1.0, graphite powder 0.8, cerium dioxide 0.2, stearic acid Zinc 0.05%, the rest is iron powder, the sum of each component is 100%; the corresponding process is green density 7.5g / cm3, sintering temperature 1200-1240℃, without tempering treatment.
[0034] After testing, the yield strength of the prepared powder metallurgy alloy is 575MPa, the tensile strength reaches 955MPa, the hardness is 98HRB, and the impact toughness is 31.3J / cm 2 .
Embodiment 2
[0036] The chromium and part of iron in the formula of Example 1 are achieved by adding fine particle Cr-Fe alloy powder with an average particle size of 4.65 μm to achieve the weight ratio.
[0037] After testing, the tensile strength of the prepared powder metallurgy alloy reaches 1212MPa, and the hardness is 31HRC.
Embodiment 3
[0039] By weight, nickel powder 1.75, molybdenum powder 0.5, copper powder 1.5, chromium powder 1.7, manganese powder 1.0, graphite powder 0.8, cerium dioxide 0.2, stearic acid Zinc 0.05%, molybdenum disulfide 0.5%, rare earth element La 0.6%, the rest is iron powder, the sum of each component is 100%; the corresponding process is green density 7.5g / cm 3 , Sintering temperature 1200-1240 ℃, without tempering treatment.
[0040] After testing, the yield strength of the prepared powder metallurgy alloy is 578MPa, the tensile strength reaches 962MPa, the hardness is 80-85HRA, and the impact toughness is 58J / cm 2 .
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Abstract
The invention discloses a timing belt wheel for a battery electric vehicle engine crankshaft. The timing belt wheel is a cylindrical gear body with powder metallurgy as a main body. The center of the gear body is provided with a center hole. A key groove is formed in the center hole. The outer peripheral wall of the gear body is provided with teeth formed in the center axis direction of the center hole. A flanged edge is arranged at the end of the gear body, integrally connected to the teeth and higher than the teeth. According to the improvement, the flanged edge is connected to tooth tops of the teeth through inclined edges; the bottom of the key groove is in an arc shape; and the surfaces of the teeth are provided with wear-proof composite layers. The invention further discloses a manufacturing method of the timing belt wheel for the battery electric vehicle engine crankshaft. The tooth structural strength is high, stress is low, and the service life is long.
Description
technical field [0001] The invention relates to an engine component and its manufacturing method, more specifically, the invention relates to a pure electric vehicle engine crankshaft timing pulley manufactured by powder metallurgy method and its manufacturing method. Background technique [0002] The crankshaft timing pulley of the pure electric vehicle engine is a cylindrical gear body with powder metallurgy as the main body. Teeth in the direction of the central axis. The defects of the existing car engine timing sprocket are: the strength of the teeth is relatively poor, easy to fail, and the service life is short. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pure electric vehicle engine crankshaft timing pulley that can significantly improve the strength of the teeth and prolong the service life. The present invention also provides this pure electric vehicle engine crankshaft ti...
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Application Information
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