forging new generations of engineers. brakes friction & braking friction: a force that opposes...
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![Page 1: Forging new generations of engineers. Brakes Friction & Braking Friction: A force that opposes motion, it prevents the sliding between two surfaces that](https://reader036.vdocuments.us/reader036/viewer/2022081811/5697bf991a28abf838c91902/html5/thumbnails/1.jpg)
Forging new generations of engineers
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Brakes
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Friction & Braking
• Friction: A force that opposes motion, it prevents the sliding between two surfaces that are in contact.
• Amount of friction depends upon:– surface material– surface finish– force, acting upon the surfaces
• By using friction, brakes slow down or stop a rotating object.
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Braking Action
• Brakes slow down a moving object by converting the kinetic energy of motion into another form.
• Most braking systems convert this kinetic energy into heat.
• The brake is cooled by moving air.
• If a brake becomes too hot, it will begin to lose its efficiency. This is called fade.
• Good brake design includes methods for adequate cooling of the brakes.
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Brakes
• There are many different types of braking systems. Some of the more common types are:– Disc– Mechanical– Hydraulic– Pneumatic
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Disc Brakes
• A friction pads is pressed against both sides of a rotating disc.
• This type of brake is commonly found on the front wheels of cars.
• They have good air flow around the brake which quickly dissipates heat.
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Disc Brake
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Mechanical Brakes
• Braking action is applied by physical force without the aid of hydraulics or pneumatics.
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Hydraulics & Pneumatics
• Hydraulic and Pneumatic systems are closely related. Both use cylinders to produce a linear motion at varying speeds and forces.
• Hydraulics uses a fluid, hydraulic oil.• Pneumatics uses air.• Advantage of hydraulics is that oil can’t be
compressed.
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Hydraulic - Pneumatic System
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Hydraulic Brake