Computation Method of Non-circular Gear Based on Seedling Needle Tip Point’s Static Trajectory in Transplanting Mechanism

doi:10.3901/JME.2016.01.064

Abstract

Abstract: A new design method of planetary gear train’s non-circular gear ratio of transplanting mechanism is presented by analyzing perfect seedling needle tip point’s static trajectory, aiming at the limitation of non-circular gear pitch curve’s design method in rice transplanter’s rotary mechanism at present. The transmission ratio between planet carrier and rotation velocity of planet gear is solved by analyzing seedling needle tip point’s static trajectory using the method of numerical analysis. The relationships of segmented transmission ratios, and the relationships between segmented transmission ratios and the transmission ratio between planet carrier and rotation velocity of planet gear are established by sectioning the transmission ratios of non-circular gear with a period of π on the basis of the symmetry of planetary gear train of rotary transplanting mechanism. Under the condition of total transmission ratios, the half spur gear assumption of non-circular gear is presented, and the problem of shortage of equations which are effective to solve the transmission ratios is solved. The correctness of computation method of non-circular gear based on seedling needle tip point’s static trajectory in transplanting mechanism is verified by three dimensional mode design and kinematics simulation of calculated non-circular gear trains.

Key words: non-circular gear, rice transplanter, seedling needle tip point’s trajectory

CLC Number:

TH112

LI Ge, YING Kongyue, ZHANG Jizhao, LI Jianfang, YU Gaohong, YE Yongsong, WANG Chan, LI Shiming. Computation Method of Non-circular Gear Based on Seedling Needle Tip Point’s Static Trajectory in Transplanting Mechanism[J]. Journal of Mechanical Engineering, 2016, 52(1): 64-71.

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