Abstract
Method for generating non-circular gear with addendum modification and its application in transplanting mechanism
Highlights
A non-circular gear pair can transmit variable rotations between two shafts
This research proposed a method to obtain the non-circular gear pitch curve by fitting control points and applied this pitch curve optimal design method to the optimal design of a rotary potted seedling transplanting mechanism, which successfully solved the difficulties in the development of rotary transplant equipment
If the non-circular gear pitch curve has a negative radius of curvature and the absolute value of the radius of curvature is less than the radius of the pitch circle of the cutter, tooth profile distortion will occur
Summary
Non-circular gear tooth profiles, and the level of optimal design of non-circular gears has been significantly improved. Wu et al.[15] established a motion model between a rack-shaped cutter and a non-circular rack, proposed a method of sequentially extracting the envelope points of the tooth profile and designed a non-circular gear of a rice planter based on the fully convex pitch curve. Li et al.[23] proposed a method for solving the non-circular gear tooth profile using the normal isometric family curves of the pitch curve and the tooth profile of the shaper cutter and quantified the degree of tooth undercut of non-circular gears. This research proposed a method to obtain the non-circular gear pitch curve by fitting control points and applied this pitch curve optimal design method to the optimal design of a rotary potted seedling transplanting mechanism, which successfully solved the difficulties in the development of rotary transplant equipment This method can theoretically realize the pitch curve design of non-circular gears with any transmission ratio. The tooth profile of the non-circular gear is enveloped by a series of tooth profiles from the gear cutter
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