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Hydraulics in a Car

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Shan Grewal

on 1 January 2015

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Transcript of Hydraulics in a Car

Car Systems
Cars are so expensive because of their complex systems. A majority of these systems use fluids and hydraulics such as the braking systems, and even the steering system.
Airflow Around
a Car
Most standard cars use their aerofoil shape to control airflow around it to maximize speed

Formula One Cars
F1 cars move so fast that it’s hard to keep the wheels on the ground so F1 cars direct air to keep it down
This is called down force
A front wing raises wind and it is able to smoothly pass across the aerofoil design
The rear wing bends the airflow up and away

Disc Brakes
There are a pair of discs which are connected to the car’s wheels
There is a caliper that surrounds part of the discs
When the driver pushes the brake pedal, he/she applies pressure to a master cylinder
The master cylinder is filled with oil (brake fluid)
When pressure is applied to the cylinder, the master cylinder is forced to release the oil, which runs through a pipe connected to the calipers
The oil applies pressure to the caliper, which in return, squeezes and grabs the disc brake
The disc brake stops moving, which causes the tire stops moving and the car stops moving
Without hydraulics (the oil) or hydraulic pressure, there is nothing to squeeze the caliper, so nothing to stop the discs and the tires
Larger vehicles use air to activate the calipers because water has a faster flow rate, less cohesion and viscosity, turning the disc brake system into a pneumatic system, rather than a hydraulic system
Do you want a homework pass?
Power Steering Pump
Answer one of the following questions to win a homework pass:
*limit to 1 homework pass per student
*Entire class gets 2 chances to get the correct answer
1. What problems does airflow cause to F1 cars?

2.What is the main reason larger vehicles use air to activate calipers?

3. What type of energy does the shock absorber receive, and what type does it give off?
Shock Absorbers
• The shock absorber can be found near the wheel, and is connected to a spring
• Without shock absorbers, the springs’ movement cannot be controlled
• Shock absorbers reduce the size of rapid bouncing motion by turning kinetic energy from the vibratory motions into heat energy that can be spread out and terminated through hydraulic fluids
• When the car goes over a bump, the spring experiences kinetic energy
• The kinetic energy is transferred to the shock absorber, causing it to quickly contract
• The hydraulic fluid inside the shock absorber, collects the kinetic energy, then quickly turns it into heat energy, and then releases the heat energy to the pistons, which are a whole different part
• When the hydraulic fluid is done this, there is no more energy in the shock absorber, causing it to expand once again, into its original shape
• Steering fluid enter the power steering pump when the steering wheel is turned
• The power steering pump forcefully pushes the steering fluid towards a Rack & Pinion
• The steering fluid adds pressure to the left or right side of the Rack & Pinion
• The Rack & Pinion is connected to the wheels, so it pushes one wheel forward, causing the car to turn
• For example, if the driver wants to make a right turn, he/she would turn the steering wheel to the right. This would cause the steering fluid to enter the power steering pump, which pushes the fluid to the left side of the Rack & Pinion, causing the left wheel to move forward, so the car goes right.
Homework passes were generously donated by Neha
 The radiator is essentially a box made of copper in the front of the engine, with a pipe sticking out and a fan
The radiator is used to cool a liquid which is a “coolant” or antifreeze
The car needs the coolant/antifreeze to keep the piston from overheating
The pipe is connected to a block surrounding the piston
The antifreeze passes through the pipe, in the block
Since the antifreeze passes through the block, it is able to make the block cool down
Since the piston sits in the cool block, the piston also gets cooler
The antifreeze circulates around the block
A water pump pushes the antifreeze, and helps circulate the liquid faster throughout the system, by increasing the flow rate of the antifreeze
The hood of the car contains many (but not all) of the car's systems
Hydraulics in a Car
Shan Grewal
Manvir Chima
Neha Devgun

Airflow around regular cars
Airflow around a F1 car
Standard Disk Brake system
Standard Power Steering Pump System
Standard shock absorber
The radiator has to keep the piston cool
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