You might have been hypnotised by the movement of the windscreen wiper on a rainy day. Although the first windscreen wiper, invented by Mary Anderson, was manually operated, today, this movement is carried out by an electric motor as it is shown in the picture:

Source: https://img.youtube.com/vi/ZIfMXxENeZY/0.jpg  (16/03/2022)

1. Write the names of the indicated elements and explain how the assembly works.

2. Write the names of the marked items (1, 2 and 3) in the following diagram of the view of a windscreen wiper motor. What is the function of element 3?

 

We have found similar image in English that teachers could use to adapt this exercise.

Sketch of a windshield washer

Source: https://pdfcoffee.com/qdownload/limpiaparabrisas-word-4-pdf-free.html (18/02/2022)

3. In the worm gear mechanism shown in the figure, the gear has 14 cogs .

a) At what speed does the gear turn when the engine rotates at 3000 rpm?

b) How many cogs should the gear have, so that when the engine rotates at 3000 rpm, the axis on which the gear is mounted rotates at 100 rpm?

 

Source: https://blogsaverroes.juntadeandalucia.es/iesbellavista/files/2015/05/EJERCICIOS_RESUELTOS_MECANISMOS_PARTE_2.pdf (18/03/2022)