How to figure gear ratios

The system may cause a reduction if the gear ratio is less than 1 or a multiplication if it is greater than 1. For eg if the driven gear has 36 teeth and the driving gear has 12 teeth the gear ratio will be 31.

Usually the first gear is a drive gear attached to the motor shaft and the.

How to figure gear ratios. Start with a two-gear train. Usually the first gear is a drive gear attached to the motor shaft and the. Count the number of teeth on the drive.

This ratio can be expressed as the number of gear teeth divided by the number of pinion teeth. So in this example since there are 54 teeth on the larger gear and 18. Part 4 of 5.

Determining a more accurate gear ratio Step 1. Place the oil catch pan under the rear differential cover. Remove the bolts that hold the rear.

Let us say the first gear has 7 teeth the idler gear has 20 teeth and the driven gear has 30 teeth. There are two ways you can compute this gear trains ratio. Divide the number of teeth on each driven gear by the number of teeth on the drive gear for each interlocking set of gears to calculate the intermediate gear ratios.

In order to select the ideal differential gear ratio the first thing you will need to know is your actual tire diameter. The simplest method is to measure the height of. Gear ratios and compound gear ratios Working out simple gear ratios two gears A feature often requested in my gear program is that it should calculate and display the gear ratio.

The reason it does not have this feature is that the gear ratio is also the tooth count ratio of the two gears and that is a value that the user has to enter. Gear ratio is the ratio of the number of teeth of driven gear and driver gear. It is used to calculate the speed and torque of output shaft when input and output shafts.

In this figure the diameter of the gear on the left is twice that of the gear on the right. The gear ratio is therefore 21 pronounced two to one. If you watch the figure you can see the ratio.

Every time the larger gear goes around once the smaller gear goes around twice. ChainRing rearCog number2 Gear ratios below 2 are considered small-size gears. Gear ratios between 2 and 3 and considered mid-size gears.

Your axle gear ratio determines how many times your driveshaft rotates for every full tire rotation. For example a 373 gear ratio requires 373 driveshaft rotations to. If you need to amplify the motor torque with a factor of 3 then you need a gear reducer with a 30 gear ratio.

In order to calculate the gear ratio of the two meshed. Gear ratios The ratio is the number of teeth on the driven gear ring gear divided by the number of teeth on the driving gear pinion gear. For eg if the driven gear has 36 teeth and the driving gear has 12 teeth the gear ratio will be 31.

This also means that for every one driven gear the driving gear will turn 3 times. The gear ratio rt is the ratio between the rotational speeds of two mating gears. More specifically it is the quotient of the input and output speeds rt os oe.

The system may cause a reduction if the gear ratio is less than 1 or a multiplication if it is greater than 1. Use our RC gear ratio and rollout calculator to find the right pinion and spur for your car. Enter your cars internal drive ratio to see the final drive ratio FDR and see the percentage change in gearing youll get from a new pinion and spur.

Count the number of revolutions the drive shaft turns using the masking tape attached to it as a guide to one tire revolution. For instance if the drive shaft rotates three and a quarter turns to one tire rotation then your rear axle gear ratio is 3251. Remove the masking tape from the drive shaft and tire.

The New Ratio box will show the ideal gear ratio getting as close to stock as possible. If you want a bit more power for rock crawling go with something closer to the Lo Ratio number. Also the Actual Ratio box shows your adjusted gear ratio if you choose to keep your original gears.