cameroon gce intermediate level 2025 engineering drawing 2

 

Theme: Belt Tensioning Device

 

 

I – SET UP

 

The assembly drawing on page 4 is a device that is used to tension the belt in a mechanism. This can be in the engine of a vehicle as shown on the perspective drawing (figure 1).

 

II – DESCRIPTION AND FUNCTIONING

 

The assembly drawing of the mechanism is presented in two views. It consists of the belt tensioner 1 that is mounted on the body of the engine with the help of part 2. Part ? on which the belt slips is mounted on belt tensioner with the help of shaft 2 that is held in position by part 5.

Depending on the desired tension on the belt, the operator can regulate the belt tensioner by loosening the parts 2 that permit the tensioner to rotate.

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WORK REQUIRED

 

SECTION A: TECHNOLOGICAL STUDY (20 marks)

QUESTION 1: IDENTIFICATION AND FUNCTIONING OF PARTS (5 marks)

• 1.1 Give the name of pieces 2 and 5. (2 marks)
• 1.2 State the function of pieces 4 and 4′. (1 mark)
• 1.3 From the sectioning convention, determine the material from which pieces 4 and 6 are made. (2 marks)

QUESTION 2: DESIGNATION OF FASTENERS (5 marks)

• 2.1 Identify the fastener 8. (1.25 marks)
• 2.2 What is the meaning of the standard designation of the fastener 8: Screw CHe M4 – 8? (1.25 marks)
• 2.3 Identify the fastener 2. (1 mark)
• 2.4 Give the standard designation of piece 2. (2 marks)