1. Mechanical transmission

Mechanical transmission is a way to transfer or convert a movement.

We can convert a circular motion to another circular motion with another size or another direction.

This movement will be expressed in the number of rotations within a time unit. Two categories can be distinguished.


1.1 Circular movement to circular movement


The first way to transfer or convert a circular motion is by a  belt transmission. 

In the picture we notice a Vee belt . 

This belt will pull itself into the Vee groove. 


The second picture shows a notched belt.

The notched belt transmission promotes the grip and so reduces the losses on the system.

A well known example of this type of mechanism is the power transmission in the car’s engine.



Another category in circular motion is the chain transmission.

This is a different way of transmission, here the belt is replaced by a chain which now grips over the chain wheel. There are no slips, so there are no losses.


This way of transmission is used in traditional bicycles to transfer or convert the movement of the pedals to the wheel.




The third type, is the gear wheel mechanism. We can separate them into two groups. The first group has parallel shafts with.

the straight cog wheels the internal cogging wheels
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The second group has crossing shafts with

conical cog wheels helix cog wheels the worm wheel transmission
wiel wiel2 womwiek

Machines and engines are an example of these transfers.

1.2 Circular movement to linear movement

We can also convert a circular movement into a linear movement. We notice two types.

The crank-connecting rod  mechanism

The crank-connecting rod mechanism is used in a traditional petrol engine.  

cilinder cilinder2

The gear rack mechanism

The last type of transmission is the gear rack mechanism. We can use this type transmission for opening gates, for example.



Thanks to Industrial Products, Brussels Power Transmission and Solid Edge and TECHNA.NL and LEGO.


Made by Klaas Driemaeker and Mohammad Ali Nodeh.