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Design of Linear Functional noncircular gear with High Contact Ratio Used in Continuously Variable Transmission

Chinese Journal of Mechanical Engineering 2023年第3期36卷 205-218页

作者： Yanan Hu Chao Lin Chunjiang He Yongquan Yu Zhiqin Cai State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China College of Mechanical and Electrical Engineering Binzhou UniversityBinzhou 256600China School of Aeronautics and Astronautics Xiamen UniversityXiamen 361005China

Continuously variable transmission(CVT)of noncircular gear has the technical advantages of large bearing capacity and high transmission efficiency.The key technology of CVT with noncircular gear has been broken through some countries,and is in the stage of deep application research.Although the characteristics and design methods of noncircular gear pairs have been continuously studied in China,the noncircular gear CVT is still in the preliminary exploration and research stage.The linear functional noncircular gear pair,whose transmission ratio is a linear function in the working section,to realize continuously variable transmission was the research object in this paper.According to the required transmission ratio in the working section,the transmission ratio function in the non-working section was constructed by using a polynomial.And then the influence of pitch curve parameters in the working section on which in the non-working section was also analyzed to obtain the pitch curve suitable for transmission of this gear pair.In addition,for improving the stability and bearing capacity of gear transmission,the noncircular gear pair transmission with high contact ratio was designed.Furthermore,the accurate value of the contact tooth length was calculated based on the gear principle and the characteristics of the involute tooth profile,from this the contact tooth length error was calculated by comparing the accurate value with its actual value obtained by the rolling experiment.Finally,an indirect method to verify the contact ratio by detecting the contact length error of the tooth profile was proposed.

关键词： Continuously variable transmission noncircular gear Pitch curve Contact ratio Contact tooth profile

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Cutting Force Fluctuation Suppression and Error Homogenization of noncircular gear Hobbing Based on the Tool Shifting Method

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 167-179页

作者： Dazhu Li Jiang Han Xiaoqing Tian Lian Xia Institute of Artificial Intelligence Anhui Polytechnic UniversityWuhu 241000China CIMS Institute Hefei University of TechnologyHefei 230009China

The current research on noncircular hobbing mainly focuses on the linkage model and motion realization.However,the intermittent cutting characteristics of hobbing would increase uncertainties in the manufacturing process.In this paper,a hobbing machining model with tool-shifting characteristics was proposed to solve the problems of cutting force fluctuation and inconsistency of tooth profile envelope accuracy at different positions of the pitch curve in noncircular gear hobbing.Based on the unit cutting force coefficient method,the undeformed chip volume generated by interrupted cutting was used to characterize the fluctuation trend of the hobbing force.The fluctuation characteristics of the cutting force generated by different hobbing models were compared and analyzed.Using the equivalent gear tooth and hob slotting numbers,an analysis model of the tooth profile envelope error of the noncircular gear was constructed.Subsequently,the tooth profile envelope errors at different positions of the pitch curve were compared and analyzed based on the constructed model.The transmission structure of the electronic gearbox was constructed based on the proposed hobbing model,and the hobbing experiment was conducted based on the selfdeveloped noncircular gear CNC hobbing system.This paper proposes a hobbing method that can effectively suppress the fluctuation of the peak and whole circumference cutting force and reduce the maximum envelope error of the whole circumference gear teeth.

关键词： noncircular gear gear hobbing Cutting force Envelope error Machining model

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