Non-circular gear planetary gear train design method based on kinematics mapping
A technology of non-circular gears and planetary gear trains, which is applied in the field of machinery and can solve problems such as the difficulty in designing rotating mechanisms
Active Publication Date: 2018-02-02
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problem that the design of the existing rotating mechanism is difficult, and propose a non-circular gear planetary gear train design method based on kinematics mapping. Through the method of kinematics mapping, two sets of The four-bar mechanism can form two closed trajectories, and then take points on the two closed trajectories and use cubic non-uniform B-spline interpolation to obtain the angular displacement curve, and obtain the total transmission ratio curve through the angular displacement curve, and carry out transmission ratio distribution; Calculating the pitch curves of two pairs of non-circular gears with two-stage transmission ratio
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[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0061] Such as figure 1 and 2 As shown, the non-circular gear planetary gear train design method based on kinematics mapping, using the method of kinematics mapping to obtain two sets of four-bar mechanisms; two closed trajectories formed by two sets of four-bar mechanisms, take points and obtain a complete angular displacement curve through three non-uniform B-spline interpolation; obtain the total transmission ratio curve through the angular displacement curve, and carry out transmission ratio distribution; obtain the pitch curves of two pairs of non-circular gears through the two-stage transmission ratio, details as follows:
[0062] Step 1. Construct the non-circular gear planetary gear train, including the planet carrier 3 and the transplanting arm 6, and the first-stage driving wheel 4, the first-stage driven wheel 2, the second-stage driving wh...
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The invention discloses a non-circular gear planetary gear train design method based on kinematics mapping. An existing method for reverse engineering of a transplanting mechanism is large in difficulty and complex in optimization process. By means of a kinematics mapping method, two closed tracks formed by two sets of four-bar mechanisms can be obtained through five given posture points, then points are marked on the two closed tracks, an angular displacement curve is obtained through three times of non-uniform B spline interpolation, and a total drive ratio curve is obtained through the angular displacement curve, so that drive ratio distribution is carried out; and pitch curves of two pairs of non-circular gears are obtained through two-stage drive ratios. Optimization adjustment is carried out through the points on the two closed tracks, the coupling correlativity is low, adjustability is higher, and the transplanting track optimizing process is simpler and more convenient.
Description
technical field [0001] The invention belongs to the technical field of machinery and relates to a transplanting machine, in particular to a design method of a non-circular gear planetary gear train based on kinematics mapping. Background technique [0002] Pot seedling transplanting is an important way to improve agricultural economic benefits. The use of transplanting machines has greatly improved the labor productivity of agriculture, planting, especially seedlings, reduced labor intensity, improved the overall level of agricultural mechanization, and pushed agricultural production to a new era. [0003] The slideway mechanism is easy to realize a special trajectory, and the design is flexible and convenient, but its structure is complicated, the cost is high, and the efficiency is low. Although the rotating mechanism is difficult to design, it has the advantages of simple structure, low cost and high efficiency. The rotary mechanism on the market is used as an alternati...
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IPC IPC(8): F16H1/28A01C11/00A01C11/02G06F17/50
CPCA01C11/006A01C11/02F16H1/28G06F30/17
Inventor 孙良王振飞
Owner ZHEJIANG SCI-TECH UNIV