# Help Zone

### Student Question

Secondary II âą 1yr.

Hello,

I can't figure out what the motion transfer mechanisms are used for and what the mechanisms are. Can you help me please!

Thanks a lot!

Science

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## Explanations (1)

• Explanation from Alloprof

Explanation from Alloprof

This Explanation was submitted by a member of the Alloprof team.

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Team Alloprof âą 1yr.

Thank you for your question! đ

Motion transfer mechanisms are used to transmit a movement, such as rotation, for example, to another part of an object, without changing the nature of the movement. In order for a motion transfer mechanism to be a motion transfer mechanism, the movement must remain of the same type,i.e., a rotation must transmit a rotation.

Note: It is possible to have an intermediate member between the motor organ and the driven member.

There are five transfer systems that you must know of:

• Friction wheels

This system is made up of two or more wheels that are in contact. Their rotation is transmitted thanks to the friction between the wheels. This system is similar to a toothless gear, as it is possible to see in the image below,

• Pulleys and belts

This system is composed of a rotating pulley that drives the belt and transmits the rotation to a second pulley. Friction is very important for this system to transmit movement; without it, it is impossible to turn the belt. This system is shown in the image below.

• Gears (toothed wheels)

This system is made up of two or more gears (toothed wheels) that transmit a rotational movement by pressing on each other. Gears are similar to friction wheels except that they don't need friction to operate; the cogs (the âteethâ on the wheels) solve this problem. This system is shown in the image below:

• Toothed wheels and chains

This system is similar to gears, except that there is a transition member, the toothed chain. The movement is transmitted through the chain between different toothed wheels. The principle behind this system is similar to that of pulleys and belts, except that they are gears. The system is shown in the following image.

• Wheels and worm screws

This system is made up of a gear and a screw, which has a helical thread. The screw is nested in the gearâs cogs and it turns ceaselessly, which is why it is said to be endless. This system is shown in the image below.

If you have any other questions, don't hesitate to ask them on the forums! đ