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Wheel
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January 29, 2020
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January 30, 2020
A wheel is a disc- or circle-shaped mechanical device. Its main purpose is to allow things to roll.
In other words, the wheel spins, and objects on the wheels move more easily along the ground. It is a simple machine.
Basic structure of wheel:
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1. The rim is the “outer edge of a wheel, holding the tire.” 2. It makes up the outer circular design of the wheel on which the inside edge of the tire is mounted on vehicles such as automobiles. |
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1. The hub is the centre of the wheel, and typically houses a bearing, and is where the spokes meet. 2. A hub less wheel is a type of wheel with no centre hub. 3. More specifically, the hub is actually almost as big as the wheel itself. |
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1. A spoke is one of some number of rods radiating from the centre of a wheel, connecting the hub with the round traction surface. 2. The term originally referred to portions of a log which had been split lengthwise into four or six sections. |
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1. The rims of wire wheels are connected to their hubs by wire spokes. 2. Although these wires are generally stiffer than a typical wire rope. 3. Wire wheels are used on most bicycles and still used on many motorcycles. |
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1. A tire is a ring-shaped covering that fits around a wheel rim to protect it. 2. It enables better vehicle performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground. |
History:
Wheels through the ages:
- As shown in the illustration, early Homo sapiens realised that round objects could be easily moved by rolling them.
- Their descendants advanced this rolling technique into the transportation of large objects on cylindrical logs.
- The invention of the wheel and axle allowed a rolling log to be placed through a hole in a wheel to create a cart.
- Chariot racing was influential in the evolution of the spoked wheel as they allowed chariots to move much faster.
- The invention of air-filled rubber tyres allowed wheels to be much faster, sturdier and stronger, ultimately redefining transportation.
Uses of Wheel:
- Wheels are used in cars, airplanes, wheelchairs, bicycles, trains, skateboards, etc.
- The wheel also has other applications. Watermills, for example, use water wheels—large structures with a series of blades along the rim—to generate hydropower.
- In the past, watermills powered textile mills, sawmills, and gristmills. Today, similar structures called turbines are used to generate wind and hydroelectric power.
- The gyroscope is a navigational instrument that consists of a spinning wheel and a pair of gimbals. Modern versions of this tool are used in compasses and accelerometers.
- In farming, there were many uses such as wheelbarrows and in cloth making, the spinning wheel allowed the conversion of raw materials to yarn and string.
Interesting Facts:
- The back wheel of a bicycle is propelled by cog wheels. The cog wheels and a chain turn the back wheel around. If you change gears, the bicycle wheels turn slower or faster.
- A wheel with teeth is called a gear. The teeth are called cogs.
- The earliest wheels were used as potter’s wheels. They were invented in Mesopotamia about 5,500 years ago.
- The wheelbarrow—a simple cart with a single wheel—was invented by the ancient Greeks.
- Wheels make life easier by allowing you to accomplish something for a longer period of time. When you turn a wheel that has an axle, the axle will also turn. The larger the wheel the easier it will turn due to the shorter distance of the axle turn.
- Wheels bring a mechanical advantage by allowing you to turn something heavy through the use of an axle that is attached to the heavy item. They require a lot of force to turn the axle so that the wheels move very fast.
- The earliest civilization that is known to use the wheel was found as evidence in an area known then as Samaria in 4,000 B.C., but is known as Iraq today.
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