# Gear ratio and torque relationship

### Gear train - Wikipedia

Assume the smaller gear is driven by a motor producing X units of power. This energy How do I calculate gear teeth from given gear ratio, torque and speed?. Motor Torque x gear ratio = torque at the wheel . this by rpm using gears and how it will affect torque any relationship is there for this one any on tell me. torque axis moment arm acceleration gear ratio newton – Si unit of force meaningful only in relation to a particular axis, so we speak of the torque about the.

## Gear train

We now have two separate meshes: You can think of the output speed as the input speed times the product of transmitting teeth divided by the product of receiving teeth: So our setup now looks as follows: Our 3 Gear Chain Enabled a Significant Speed Reduction Once we understand how the speed is reduced through the gear chain, calculating the transfer of torque is simple: As the output speed of the gear chain decreases, the system can deliver more torque.

If you browse our product catalogue, you can see that for similar motors for example our XX as the Gear Ratio increases, the Rated Torque increases, and the Rated Speed decreases.

An important note is to remember that the speed depends on the level of required torque. The Rated Speed is at the Rated Torque, and other values can be read from the Typical Performance characteristics graphs. If the load is constant, a better way of thinking about it is not to consider the torque as an output of the motor but as an input to the system.

## Application Notes

With our known load at the output gear, we actually work backwards to find what load motor is seen by the motor. From there we can read the Typical Performance Characteristics and estimate the speed of the motor and other details such as the current draw.

Essentially, the larger gear turns slower. The third gear in the picture has 42 teeth. The idler gear serves to make both the drive gear and the driven gear rotate in the same direction, but confers no mechanical advantage.

Belt drives[ edit ] Belts can have teeth in them also and be coupled to gear-like pulleys. Special gears called sprockets can be coupled together with chains, as on bicycles and some motorcycles. Again, exact accounting of teeth and revolutions can be applied with these machines. Valve timing gears on a Ford Taunus V4 engine — the small gear is on the crankshaftthe larger gear is on the camshaft.

### AB : Introductory Gear Equations - Precision Microdrives

The crankshaft gear has 34 teeth, the camshaft gear has 68 teeth and runs at half the crankshaft RPM. The small gear in the lower left is on the balance shaft.

For example, a belt with teeth, called the timing beltis used in some internal combustion engines to synchronize the movement of the camshaft with that of the crankshaftso that the valves open and close at the top of each cylinder at exactly the right time relative to the movement of each piston.

A chain, called a timing chain, is used on some automobiles for this purpose, while in others, the camshaft and crankshaft are coupled directly together through meshed gears. Regardless of which form of drive is employed, the crankshaft-to-camshaft gear ratio is always 2: Automotive applications[ edit ] Illustration of gears of an automotive transmission Automobile drivetrains generally have two or more major areas where gearing is used.

Gearing is employed in the transmissionwhich contains a number of different sets of gears that can be changed to allow a wide range of vehicle speeds, and also in the differentialwhich contains the final drive to provide further speed reduction at the wheels.