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TM 220

- Friction of V-belts and flat belts on metal pulleys


Technical Description

This experimental unit enables experiments to be performed on belt drives and belt friction. The core of the unit is a cast iron pulley with grooves in its circumference for V-belts and flat belts. The pulley is mounted in ball bearings and is operated with a hand crank. The inertia of the pulley contributes to even rotation. The belts grip the pulley at an angle of contact from 30° to 180° in 15° steps. Two spring balances measure the tensile forces at each end of the belt. The belt tension can be precisely adjusted using a threaded spindle.

Learning Objectives / Experiments

- Influence of angle of contact, coefficient of friction and belt force (Eytelwein's rope friction formula)
- Comparison flat belt - V-belt
- Consequences of an incorrectly aligned belt


[1] Experiment on belt friction and belt drives
[2] Portable experimental unit with metal stand
[3] 1 flat belt, 1 V-belt, and 1 round belt
[4] Ball bearing mounted belt pulley with three different belt grooves
[5] Angle of contact of the belts 30°...180°, graduations 15°
[6] Force measurement using 2 spring balances 

Technical Data
Flat belt
- 15x2.2mm, leather/polyamide
- ISO 4184
- profile: SPZ
- 9.7x8.0mm, rubber/fabric
Round belt: 3mm, hemp 
Belt pulley
- D=300mm
- material: cast iron
Dynamometer: 100N ±1N, spring balance

Dimensions and Weight
l x w x h: 700 x 350 x 1050 mm
Weight: approx. 47 kg

Scope of Delivery
1 stand
1 flat belt
1 round belt
1 V-belt 
2 dynamometers
1 manual

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