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    • Influences of Structure of Cylinder Head Bolt Coupling on Cylinder Hole Deformation of Diesel Aluminum Alloy Cylinder Block
    DOI：10.13949/j.cnki.nrjgc.2023.03.014
    Key Words:aluminum alloy cylinder block  cylinder head bolt preload  bolt hole  cylinder bore deformation  Fourier transform  evaluation index
    Author NameAffiliationE-mail
    BAO Yuzhuan* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650224， China 1987568689@qq.com 
    LEI Jilin Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650224， China  
    LI Weixian Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650224， China  
    DENG Wei* Yunnan Key Laboratory of Internal Combustion Engine， Kunming University of Science and Technology， Kunming 650224， China 1323364897@qq.com 
    SONG Guofu Kunming Yunnei Power Co.， Ltd.， Kunming 650217， China  
    LIU Kang Kunming Yunnei Power Co.， Ltd.， Kunming 650217， China  
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    Abstract:A cylinder head–gasket–block coupling model was presented and the numerical simulation method was used to determine the effects of changing the bolt hole design parameters on the key section of round cylinder hole deformation. And four evaluation indexes including the average roundness， cylindricity， coaxality， and light-leaking under the condition that the same cylinder head bolt pre-tightening force was applied to both cast iron cylinder and aluminum alloy cylinder. According to the study， there is almost no difference in the deformation trend of the key section between cast iron cylinders and aluminum alloy cylinders as shown in the Fourier transformation. The average roundness， cylindricity， and coaxality rose by 54.41%， 38.39%， and 27.08%， respectively， with little difference in light-leaking. In the case of aluminum alloy cylinders， a lower counterbore hole to bolt hole ratio led to less comprehensive deformation of each section and lower average roundness， cylindricity， and coaxality. However， the section below the main force section of the screw thread was less consistent in the extreme phase angle of the fourth-order Fourier deformation. When the counterbore depth was kept constant while the length of the screw thread was raised properly， the average roundness， cylindricity， and coaxality of cylinder holes decreased most dramatically. As the length of screw thread was kept constant while the counterbore depth was reduced， the average roundness， cylindricity， and coaxality of cylinder holes were the smallest， and decreased by 32.74%， 31.24%， and 39.34% respectively， compared with the original cylinder block.
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