The position of the driven wheel when resting is determined by the engagement point Ee of the end of the driving wheel, which is located at the intersection of the top circles of the two wheels, so that changing the tip height of the end teeth of the driving wheel can change the position of the Ee. In order to facilitate the positioning of the driven wheel, when the gear is stopped, the gear teeth (or the tooth tips) are symmetrical to the connecting core line, and the tooth top height coefficient of the end gear of the driving wheel must be corrected. Let h*a1 be the tip height coefficient of the end gear of the driving wheel, and the tooth height coefficient of the gear teeth and the driven wheel of the driving wheel except the last tooth are standard values. The tooth tip interference and the head gear height of the driving wheel are the possibility that the leading tooth of the driving wheel can be prevented from entering the meshing by the top of the driven wheel before entering the meshing. The phenomenon is called the tooth. Top interference.
In order to avoid the interference of the tooth tip, the height coefficient of the tooth tip of the first tooth of the driving wheel must also be corrected. Generally, the top height coefficient of the first tooth of the driving wheel is equal to h*a1. The actual time ratio of the cold-rolled strip is Rt in the Rtp type, which is obtained by the imaginary driving wheel being full of teeth. In fact, the time ratio is related to the driving angle of the driving wheel. The driving angle of the driving wheel is the sum of the engaging angle B1 and the engaging angle B2. When optimizing the design of the sector gear mechanism, the first requirement must be the time ratio Rt. At the same time, the transmission should be considered to be stable, the gears are not cut, and the structure is compact. Due to the large number of institutional parameters and complicated calculations, each parameter has a mutual constraint on the design requirements. If a set of parameters is tried, it will not only take time and effort, but also can not find the direction of improving the design. Therefore, it is necessary to adopt optimized design. Method to obtain satisfactory results in a short period of time.
DC Motor
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