Basic Technology

Belt and Pulley Drives: Types of belt in belt drives

len Alfred Ajibola -3rd March, 2020 @ 1:07 PM

Topics in Basic Technology

Definitions of technology and their explanations Examples of technology Forms of technology explained with their differences Types of chain drive Types of belt drive Types of Ceramics Advantages and Disadvantages of Chain Drives Len Academy Questions for Basic Technology JSS3, 2nd Term Len Academy Basic Technology Questions, JSS3 Belt and Pulley Drives: Types of belt in belt drives Refrigerator as an electromechanical device, its parts and operations What is chain drive? Classification of chain drive What are Belt Drives? Advantages and Disadvantages of Belt Drives Type of Lines in Technical Drawings Len Academy questions for Basic Technology, JSS2, 2nd Term Len Academy questions for Basic Technology JSS2, 2nd Term, Part 2 What is Maintenance? Types of Maintenance Hardwood and Softwood - Characteristics and Examples What are Ceramics? Characteristics of Ceramics


Academic Questions in Basic Technology

Please click here to see all Questions and Answers

The _____ functions to remove excess heat from the refrigerator.

  • A. Evaporator

  • B. Compressor

  • C. Condenser

  • D. Expansion Valve

  • E. Thermostat

  • F. Defrost System

A fluid or gas that runs through the compartments of a refrigerator is termed _____.

  • A. Water vapor

  • B. Liquid vapor

  • C. Frost

  • D. Refrigerant

  • E. Compressed water

  • F. Evaporated water

Current flows through a path called _____.

  • A. Electricity

  • B. Electric Route

  • C. Electrolysis

  • D. Transformer

  • E. High Tension

  • F. Electric Circuit

Googles are safety wears.

  • A. True

  • B. False

Which of the following is false concerning advanced ceramics?

  • A. They can be made from metallic oxides

  • B. They are very hard and durable

  • C. They are corrosion resistant

  • D. They are fired in the presence of oxygen

  • E. They are fired at a very high temperature of about 1700oC

  • F. They can be made from non-oxides such as carbides and borides

A thin continuous line is used for representing the followings except _____.

  • A. Intersections

  • B. Hatching lines

  • C. Long breaks

  • D. Diagonal line used to state plane surfaces

  • E. Leader lines

  • F. Back section lines

Inverted toothed chain drive - Len Academy

With regards to chain drives, the diagram above is a/an _____ chain.

  • A. Roller

  • B. Silent

  • C. Leaf

  • D. Flat-top

  • E. Detachable

  • F. Acceleration

A type of chain drive commonly used in bicycles is the _____ chain.

  • A. Roller

  • B. Silent

  • C. Leaf

  • D. Flat-top

  • E. Detachable

  • F. Acceleration



Belt and Pulley Drives:

The belt drives are frictional drives that transmit mechanical energy on a dry surface from one shaft to another in a pulley-like system. An instance of a belt drive is shown in the image below.

Belt Drive - Len Academy


For the belt drive to work properly, both sides of the shaft must be dry and separated by some distance.

Please read on the advantages and disadvantages of belt drives here.

Note: Either shafts (also referred to as the pulleys) on which the belt drives are attached do not necessarily need to rotate at the same speed; neither must they be of the same size.

You can read on chain drives here.


The tension between both sides of the belt will depend heavily on the angle of contact. To this end, the tight side of the belt drive is always below while the slack (or loose) side stays above. They are shown in the image below.

Slack and Tight sides in a Belt Drive - Len Academy

You can read on angles here.


The area of belt having a lesser tension (less tightly stretched) is generally referred to as the slack side while that having a higher tension (more tightly stretched) is termed the tight side. You can think of tension as the level of tightness at which something is stretched.

Please read on the concepts of force and motion here.


In belt drives, mechanical power is usually transmitted from the driving pulley to the driven pulley via a rotational motion. Since belt drives are used in conjunction with pulleys, some of the mechanisms or machines that utilizes belt drives include:


Types of belt in belt drives

The belts used in machines utilizing the belt drive system can be of the following types:

Belt Types in Belt Drive - Len Academy


  1. Flat Belts: These belts are somewhat rectangular in shape; and they bring about rotational movement over long distances; and with a very low noise. The flat belts have an efficiency of about 98%.
    Please read on motion and speed here.

  2. Vee Belts: They are used with grooved pulleys and can allow for high speed and rotation. They are relatively common because of their low cost and numerous size ranges.
    You can attempt Len Academy basic technology questions for JSS2 here.

  3. Circular Belts: These belts are circular in shape. They can also be used with the grooved pulleys.

  4. Cylindrical Belts: These belts are looped and flat. They are often used in milling machines.

Materials used in making the various kinds of belt drives include rubber, plastic, fabric, leather and other synthetic materials.

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Amazing facts in Basic Technology

Rubber bands - Len Academy

Rubber bands last longer when refrigerated

Lighter was invented before matches

Johann Wolfgang Dobereiner was credited with the invention of lighter in 1826 while the match was made 3 years later

Volkswagen group of companies own some of the top cars of the world. These are Audi, Bentley, Bugatti, Ducati, Lamborghini and Porsche


Notable points in Basic Technology

Arrowhead Lines - Len Academy

Arrowhead lines are lines with pointed edges at one or both ends. The pointed edges are in the form of an arrow.

Arrowhead lines are used:

  • At the end of dimensional lines.

  • As measurement lines.

Please read more on types of line here.

A thin continuous line could be a straight or curved line. However, the main point to remember is this: 'it is a tiny line with no dot or dashes within it'.

_______________________

A thin continuous line is used for representing the followings:

  • Projection lines

  • Hatching lines

  • Construction lines

  • Short center lines

  • Measurement lines

  • Diagonal lines used to state plane surfaces

  • Intersections

  • Leader lines

  • Backside section lines

Any action that involves the servicing, checking, replacing and repairing of an equipment, object or device is termed maintenance.

Maintenance has two main goals. These are:

  1. To prevent a breakdown

  2. To repair the breakdown

 

Below are the types of maintenance:

  • Preventive maintenance

  • Corrective maintenance

  • Predictive maintenance

  • Periodic maintenance

  • Reinforcement

  • Overhaul

Please read more on maintenance here.

 

Softwoods are often derived from coniferous trees, that is: trees with needle-like leaves, and whose seeds are covered in cones.

Below are some characteristics of softwood:

  • Most softwood have lower densities than hardwood (weighs lower).

  • In terms of price, they are often less expensive than hardwood.

  • Their growth rate is faster than hardwood.

  • Most softwood do not shed their needle-like leaves during the year. However, the softwood 'larch' and 'cypress' are exceptions.

  • They are less fire resistant.

Please read on hardwood and softwood here

The diagram below shows the various types of line in technical drawing, their description and general application:

Type of Lines - Len Academy

Please read more on the types of line in technical drawing here