Table of Contents

## How do you calculate the number of teeth in gear ratio?

The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).

**How do you calculate gear torque ratio?**

Divide the diameter of the output gear by the diameter of the input gear. Multiply the torque of the motor by the gear ratio to get the output torque. For example, a motor that puts out 10 lb. -feet of torque used with a gear reducer with a 10:1 gear ratio will give you 100 lb.

### How do you calculate gear velocity ratio?

Gear Velocity Ratios Velocity ratios are calculated by dividing the driver gear by the driven gear. The driver gear or pulley is the one connected to the power – e.g. the pedals on a bicycle or the motor. To calculate the speed of the driven gear – multiply the speed of the driver gear by the velocity ratio.

**How do you find the gear ratio on a rack and pinion?**

Instead of counting the number of teeth in each gear, measure the distance the rack moves in inches. Measure the distance from the end of the rack to an arbitrary point, turn the pinion one full revolution and then measure the distance again. The difference between the two is the gear ratio.

#### How do I choose a gear ratio?

The conventional procedure for selecting gear ratios is to pick ratios that run the engine rpm to redline at the end of the medium and longest straights, and pick the lower gear ratios to minimize the rev drop at each shift. This method minimizes the number of shifts per lap.

**What are the bumps on a gear called?**

It’s called an involute and it looks like a hill with a plateau at the top. It has been a standard part of gears ever since.

## Does a higher gear ratio mean more torque?

In general, a lower final drive ratio will lead to less torque at the wheels but a higher top speed. Meanwhile, a higher ratio will result in the opposite, i.e. more torque at the wheels but a lower top speed. Remember, this is done without any change to the power and torque of the engine.

**What is the best gear ratio for torque?**

A 4.30 ratio will give you better low end acceleration but also lower gas mileage. A 3.73 ratio will still provide decent acceleration but will also provide a tad better mileage plus give you a higher top end speed.

### Is gear ratio equal to velocity ratio?

One of the important concepts is the velocity ratio, which is the ratio of the rotary velocity of the driver gear to that of the driven gears. If the 15-tooth gear is the driving gear and the 30-teeth gear is the driven gear, their velocity ratio is 2.

**Which gear has highest velocity ratio?**

The largest LEGO gear is the 40t, while the smallest is the 8t, thus, the highest ratio we can obtain is 8:40, or 1:5. you can use a multistage reduction system, called a geartrain.

#### How do you determine the number of teeth on a pinion?

The calculation uses the number of teeth in the ring gear and divides it by the number of teeth in the pinion gear to provide you with a “[result] to 1” ratio. For example, if the pinion gear has 41 teeth, and the ring gear has 11 teeth, the ratio would be calculated as 41/11, which is equal to 3.73 = 3.73:1.

**Can a rack drive a pinion?**

Rack and pinion systems can operate in one of two ways: with the pinion (including gearbox and motor) moving and the rack stationary, or with the pinion assembly stationary and the rack moving. Rack and pinion drive systems do have backlash, due to the meshing of gear teeth.