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Question:

Is the diameter of the belt wheel in the triangle belt a diameter or a trough?

Is the diameter of the belt wheel in the triangle belt a diameter or a trough?

Answer:

For the tower wheel, you can view it as a few different belt wheels. The base diameter is not measured. In GB/T10412, the lowest value of the groove depth on the base line and the depth minimum below the base line, you can refer to the standard
In general, the minimum value of the groove depth in the outer diameter of the base line is the base diameter, and the bottom of the trough is twice the base diameter and the bottom of the trough is also the diameter of the base. But it's not always true, because it's possible that the designer has to design the outside diameter or the bottom diameter not the minimum. So, you can do both of the above, and then you get two base diameters, and then you take the arithmetic mean, and you can use the spectrum as a reference.
V-belt drive many of the computation, such as, speed ratio, center distance, the benchmark parameters such as length, pulley Angle are calculated using benchmark diameter of pulley, the so-called benchmark actually refers to the effective diameter of the transmission diameter, the diameter is not the bottom of the channel is neither a pulley diameter size, similar to the gear or sprocket pitch circle diameter.

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