Basic Technology

Advantages and Disadvantages of Chain Drives

len Alfred Ajibola -30th May, 2020 @ 09:38 AM

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



What are Chain Drives?

Before we look into the advantages and disadvantages of chain drives, it will be a good idea if we first understood what they really are.

A chain drive is simply defined as a mechanism that transmits power mechanically from a machine's engine to its wheel through an endless rotating chain.


Examples of machines that utilizes the chain drive mechanism include tractors, bicycles and chain saws.

Note: Based on the respective uses of the chain drive, they can be classified into three types. These are:

  • Power Transmission Chains

  • Load Lifting Chains

  • Hauling Chains

Please read the introduction to chain drives and its types here.

 

Advantages of Chain Drives

  1. They have a very high efficiency (at about 99%).
  2. They transmit larger load with higher power than belt drives.
    Please read on belt drives here.
  3. They work fine at different temperatures, including wet conditions.
    You can read on the concepts of heat and temperature here.
  4. They produce less stress on the shafts. This is because they make use of sprockets which are lighter than pulleys as seen in belt drives.
  5. The rate at which they are checked for maintenance is low.
    Please read more on maintenance here.
  6. They are positive non-sail drives.
  7. With regards to the size of the machine, they occupy less space and are more compact when compared to belt drives.
  8. They can be used for both long and short distance activities.
  9. They are not prone to catching fire.
  10. They can withstand abrasive conditions without being cut.
  11. A single chain can drive a number of sprockets.
  12. Compared to gear drives, they are simplier and less expensive.

 

Disadvantages of Chain Drives

  1. They are expensive than belt drives.
  2. They require lubrication for optimum performance.
    You can read on the concepts of force and motion here.
  3. The driving shaft and the driven shaft must be always perfectly aligned.
  4. Their alignment must be precise if they are to work effectively.
  5. Most chain drives generate noise while in operation.
  6. They are not suitable for non-parallel shafts.

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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