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The Bicycle as a System

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Yuki He

on 15 April 2013

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Transcript of The Bicycle as a System

Brakes and Steering The Bicycle as a System Describe the subsystem that your group researched.
What is its function within the bicycle system? The subsystem our group has researched is Brakes & Steering. The function of brakes within the bicycle system is that brakes are designed to increase friction allowing the rider to slow down or stop the bicycle. There are 3 main types of brakes. The first brake is the coaster brake. The coaster brake is used by reversing the motion on the pedals. The second brake is called a Caliper Brake, it is used by pulling on levers which pull cables, forcing pads or shoes against the inner rim of the front or rear wheel. The third brake is the Drum and Disc Brakes. The drum brakes work by applying friction from a pad inside an enclosed drum. The drum is part of the hub of a wheel. The Disc Brakes work like caliper brakes, with a separate disc attached to the hub. The main benefit is that the disc is away from the wheel spray and consequently any liquid, dirt or other materials. Both of these brake systems adds weight to the bicycle, but drum brakes are much heavier. Steering is the control of where the bicycle is moving towards. The steering depends on the speed of the bicycle including the angle relationship of its frames and wheels. Your position, of the bike and front wheel make a huge difference when turning since a bicycle is in a constant state of imbalance. It is very easy to start a turn by taking advantage of the beginning of a fall and transforming it into a turn. Speed: mountain bike =lower amount of speed due to friction on wheel’s tire : road bike= greater amount of speed due to less friction on wheel’s tire
Safety: the wheel should be secured to the back frame of the bike and should cause no wobbling. The gears and drivers on a bike should be tightened and secured on the frame so the gears and drivers don’t fall out. Mountain bikes have strong brakes and if pull hard you can throw yourself over so it is quite a risk
Comfort: the comfort of the wheel should be smooth and clean while you ride the gears are connect to the wheel chain of the bike the chain should act smooth. The frames are build to feel strong and sturdy
Durability: a wheel with strong spokes can long last the wheels life span the gears and drivers are made a rock hard steel so the gears can be reused on a different bike. The durability of the frame of the bike is made with strong materials which expand the life span of the bike
Drivers and gears: by switching the gears on a bike you can change the speed your going
Frames and materials: a light frame causes a greater amount of speed on a bike and heavier frame slows it down Complete the table below to identify the following: Parts: Coaster Brake, Caliper Brakes, & Drum and Disc Brakes
Function: Coaster brake work by reversing the motion on pedals. Caliper Brakes work by pulling on the lever that pulls cables, forcing pads, or shoes against the inner rim in the front or rear wheel. Drum brakes work by applying friction from a pad inside an enclosed drum. Disc brakes works like caliper brakes but with a separate disc attached to the hub.
Input: For the coaster brake, the mechanism is inside the hub of the wheel, which creates friction and slowing the bike. For the caliper brakes, riders place gentle pressure on the brakes. The drum brakes generates heat and warning labels appear on the outside of the hub. The disc brakes is away from the wheel spray therefore liquid, dirt, or any other materials.
Output: Coaster brakes lock up or skid the rear wheel when it's engaged. Caliper brakes can perform better in wet weather because it takes twice the distance to stop than on dry land. Drum and Disc brakes add more weight to the bicycle. Could any part of this bicycle be made of a different material and still help the bicycle carry out its function? All brakes have the same function, to increase the amount of friction, allowing the rider to slow down and eventually stop. Rim brakes are made of leather or rubber, disc and drum brakes are heavy brakes that are usually made of steel or iron and caliper brakes are made of lightweight materials such as aluminum. All of these brakes are made of different materials but they still provide the same function. Can any one part of the bicycle carry
out the job of the whole bicycle? Explain your answer. No, we don't think that one part could carry out the job of the whole bicycle. This is because the gears and wheels and other parts are important and without them the bicycle will not operate properly. The gears job is to help increase the needed to push or pull something. Furthermore without the frames, gears, brakes, steering and etc, the bike will not operate the way it should. Can you take a part from another bicycle and use it to replace a part in this bicycle and still have the bicycle carry out its function? The answer is no because bicycles come in different sizes. For example if you compare a child’s bike to an adult's bike, the adult bike is much bigger than the child’s. Therefore if you replace the pieces with one another, one would be too big or too small for the bike. Because it won't fit onto/into the bike, it can't carry out the same function. Complete the table to indicate
how the subsystem affects the bicycle's
speed, safety, comfort, and durability Name the parts of the bicycle's subsystem. If you don't know the name of a part, make up the name
Tell what function each part has and how it contributes to the subsystem
For the bicycle subsystem to work, what input must be receive?
What, if any output does the subsystem produce? Could some parts of the bicycle be arranged differently so that the system will still carry out its function? Explain your answer. Does the bicycle require symmetry among any of its parts? If so, describe the symmetry. What will happen to the bicycle if one part, such as a spoke, breaks? What if all the spokes on a wheel break? Is it useful to think of a bicycle as a system? Justify your answer. Yes, a bicycle does require symmetry because the wheel has to be a perfect circle, and if the wheel is not a perfect circle, it will not function properly. The pedals also have an inverse symmetry, which means that if you rotate the pedals, it will always go back to it's original position. It depends on the parts of the bicycle you switch. For an example on an adult bike if you switch the back tire with the front tire the bike will still function properly. If you switch the seat with the handle bars therefore it won’t work. That’s why it depends on the parts you switch. Yes we think of a bicycle as a system because a bicycle is made of many subsystems, and each subsystem has its own job. For example, brakes slow down the bike and the wheels move the bike. Each part/subsystem of the bike has its own job that another subsystem can't do. When all the subsystems are working together, it creates a working bicycle. Brakes and Steering Video If one spoke breaks, the structure of the wheel will be weaker than if none of the spokes are broken. If all the spokes on the wheel break then the hold of the wheel is very likely to not withstand the bikes weight.
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