What is a slewing gear

Introduction of slewing gear parameters.

• Name and Code
• Basic parameters

Base circle (db, rb):

Involute circle

Addendum circle (d/ra):

A circle connecting the tooth tips of a gear

Dedendum circle (d/rf):

A circle connected at the bottom of the groove

Tooth thickness (si):

On the di circumference, one tooth or so,The arc length between the two tooth profiles.

Tooth groove width (ei):

On the d circumference, The arc length between the teeth.

Pitch (pi):

Pi=si+ei

Divided circle d (r):

Design gear on the divided circle of the reference circle, p=s+e.

Addendum height (hi):

Dedendum height (hf):

Tooth height h=ha+hf

1. Tooth No-Z
2. The perimeter of the divided circle-m, πd=zp, d=z(p/π）

Artificial regulation ：m= p/π can only take some simple values, called m. So：d=mz, r = mz/2.

The unit of modulus： mm

It is a basic parameter for the gear’s size, Same tooth no, different modulus, Same divided circle , different modulus