# What Is Velocity Ratio In Gears? Author: Lisa
Published: 12 Nov 2021

### The gear ratio of a transmission train

The gear ratio of a gear train is the ratio of the input gear's speed to the output gear's speed. The gear ratio can be calculated from the number of teeth on the gears.

### Fundamental Law of Gear-Tooth Action

The pitch point is called Point P and it is very important to the velocity ratio. The line between the centers is divided by a pitch point. The fundamental law of gear-tooth action is expressed in this expression.

The arm H is a frame in the imagined mechanism. The axis of gear is immobile. The imagined mechanism is an ordinary gear train.

### The Law of Gears in a Train

A train with two or more gears. It can be used to increase or decrease the output shaft's speed or Torque. The gear ratio is a calculation of the speed and Torque of the output gear.

The law of gearing states that the ratio of the two gears is always the same. The normal at the point of contact between the teeth of the gear is always passed through the pitch point. The point of contact between the gear circles is called the pitch point.

The number of teeth in the driver gear is called the gear ratio. It is used to calculate the Torque and Speed of the output shaft when it is connected using a gear train. The driver is the input gear where the Torque is applied.

The output gear is called a driven gear. Idler gears are used in between the driver and driven gears. The law of gears is stated.

Torque to input Torque is equal to the gear ratio in a gear train. If input Torque is known, that's a good thing. The output Torque can be calculated by taking the input Torque and dividing it by the gear ratio.

### The Velocity Ratio of an Inclined Plane

Work output is the same as work input for ideal or perfect machines. The ratio of distance travelled by effort to the distance travelled by load in a machine is called the svelte ratio. The machine has a force ratio of 5.

The distance moved by the load is five times the distance moved by the effort, and the load is five times the effort. The theoretical mechanical advantage of a system is the ratio of the force that performs the useful work to the force applied, assuming there is no friction in the system. The ratio of the distance moved by effort and load in the same time interval is called the vechicle ratio.

### Parameters of a Machine

A machine does a large work by using a small amount of effort. The configuration of a machine affects its performance. The dimensions and configurations of a machine are called parameters.

### A Gear Train Example

The gear trains are used in most mechanical applications. There are many information about the gear pairs. If a bunch of gear pairs is used in machinery, gear trains are obtained.

Take a look at the example. The proportion of rotation between the pinion and bigger gear is what the velocity ratio calculations are for. The relationship between the two is inverse.

The gear that is assembled to the input shaft and the smaller gear that is assembled shaft 2 are driving gears in the gear train example above. Other gears are not always driveable. The calculation can be used to find the train value.

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