The tooth length is the length from the dedendum to the top of the tooth : The tooth length is obtained by the following formula. The addendum length is the length from the pitch circle diameter of the tooth shape to the top of the tooth : The addendum length of a general spur gear is obtained by the following formula. Calculation of the addendum length, ha, and the tooth depth, h
The center distance is the distance between the shafts of a pair of gears.Ī=(Z 1+Z 2)×m/2=(17+34)×1.0/2=25.5 (mm) 3.
The center distance is also calculated by using the basic elements. The pitch circle diameter of the large gear :ĭ 2＝m×Z 2＝1.0×34=34 (mm) 2. The pitch circle diameter of the small gear : The pitch circle diameter is calculated by using the basic elements shown above. Let’s see the processes to examine the shape of the gears from these basic elements.ġ. Table 2-1 Basic elements of gears determined temporarily Basic element Designing a gear’s basic shape (by hand calculation method)īasic elements of gears temporarily determined in the previous chapter are shown below.
