# How are planetary gear teeth calculated?

## How are planetary gear teeth calculated?

To make calculating planetary gear ratios as simple as possible, note the number of teeth on the sun and ring gears. Next, add the two numbers together: The sum of the two gears’ teeth equals the number of teeth on the planetary gears connected to the carrier.

## How do you calculate torque of a planetary gearbox?

1. Input torque = (60*voltage*current)/ (2*22/7*input speed) 2. Output torque = (60*voltage*current)/ (2*22/7*output speed) 3. Holding torque = Output torque – Input torque.

What is the point of planetary gears?

Generally, planetary gears are used as speed reducers. They are used to slow down motors and increase the torque.

### What causes planetary gears to fail?

Planetary gearbox are exposed to high speed reduction mostly because of their capability and compact size. Faulty design is not only the reason for gearbox failure, manufacturing and material handling can be one. In planetary gearbox, noise is usually no worse, and often better than standard gear-and-pinion reducers.

### Do planetary gears increase torque?

A planetary gearhead takes a high-speed, low-torque input, say from an electric motor, then increases torque and reduces speed at the output by the gearhead ratio.

How do you know if a planetary gear is bad?

If there is buzzing, clunking, humming noise A buzzing, clicking, humming, roaring noise from inside the transmission is usually a symptom of a bad bearing, planetary gears damage, or other internal problem. A buzzing could also come from a bad internal sealing surface, a seal, or low transmission fluid due to a leak.

## How is the ratio of planetary gear calculated?

(Note: The calculator converts under the assumption that one unit of the gearbox is fixed (sun, planet carrier and annulus gear), therefore does not rotate). The overall demultiplication of multi stage planetary gear units is calculated by multiplying the ratios of the single stages. The number of teeth of the planets has no effect on the ratio.

## How are the teeth of the planets determined?

Their number of teeth depends on the demultiplication of the gearbox. The planets are merely seen as a “bridge” between the sun gear and annulus gear. Below, you can perform calculations with custom values ​​ (calculation starts with ENTER or TAB).

How is the tooth contact calculated in zar5?

The ZAR5 planetary gearing calculation program calculates the geometry and strength of sun, planet and ring gear (spur or helical, involute teeth) according to ISO 6336, ISO 1328, DIN 3960, 3961, 3967 and 3990. ZAR5 calculates the tooth contact for gear pair sun-planet and planet-ring gear.

### What are the different types of planetary gears?

A simple planetary gear consists of a ring gear, a sun gear, and multiple planet gears, where typically the sun is the input and the planet carrier is the output. A compound planetary gear consists of multiple simple planetary gears in so-called “Stages”. Please choose which type you want to generate below.