The clutch and brake units are the devices that are mounted between the gears and engines of cars. They are connected with a transmission system, which helps transmit the energy from the clutch and brake units to the engines and wheels, in order to control the movements of the cars.
From the exterior of the clutch and brake units, which are the parts that show inside the car, the clutch and brake are extended to a pedal respectively along with the accelerator, in order to let the driver to control the car by stepping on these pedals.
From the interior construction of the car, the clutch and the brake are set beside the engine and the wheels. They are connected to the pedals with the push rods, and transmit the instructions to the engine and the wheels with the transmission system.
This unit as well as the accelerator are the three main elements that facilitates the starting and stopping of a car. They have interrelation with each other, but each of them plays different roles in the movements of a car.
Among these three elements, the clutch and brake cannot only work as the same unit, but also be separated as individual parts, depending on whether it is a manual or automatic car.
For the manual car, the clutch and brake units work together. As for the automatic car, the controlling force of the clutch is automatic, and the driver only have to control the movements of the car with the brake and the accelerator.
For those who have no experience of driving a car, they are only able to tell from two of the three pedals. One is the brake, which is used to slow or stop the movements of the wheels, and the other is the accelerator, which is used to actuate the movements of the wheels.
However, not only the brake and the accelerator are important, the clutch, which is used to start or stop the car, is also indispensable in the systems.
Although both the clutch and the brake have the ability to stop the movements of the car, they are not the same thing, since their direct receivers and the operation functions of them are different.
In other words, because the brake is mainly used for producing friction directly to the rotor and the drum on the front and rear wheels, and the clutch drives the crankshaft that penetrates through the engine and the gear instead, the direct receivers of the former and the latter are not the same.
In addition, the brake is dedicated to absorb the kinetic energy, and transform the kinetic energy into heat, so as to produce friction on the wheels. In contrast, as the clutch is able to start the movement of the car, in that situation, it would rather deliver power to drive the gears for transmitting the kinetic energy to the car.
The formation of a clutch and brake unit can be divided into the clutch system and the brake system, as what they are directly connected with are different from each other, which makes their configuration vary as well.
● brake system
As the brake system is actuated by transforming the kinetic energy into heat to product friction on the wheels. The kinetic energy is the hydraulic force, which usually comes from oil.
Therefore, behind the brake pedal and the push rod, there is a vacuum booster. On the other side of the vacuum booster, the hydraulic system consists of a fluid reservoir, a master cylinder, and several fluid lines.
The fluid reservoir is applied to store the oil, and once vacuum booster receive the pressure from the brake pedal, the oil would be released from the reservoir and pressurized through the master cylinder. After that the master cylinder would distribute the pressurized oil out from the fluid lines.
When the pressurized oil flows through the front and rear wheels, with the spinning of the wheels, the heat as well as the friction would be produced, and this stop the movements of the wheels.
● clutch system
The clutch is comprised of three main parts, including the flywheel, the clutch disc, and the pressure plate spring system. These parts are attached to each other and supported by the crankshaft in the middle.
When the car is operated, the power would be disengaged, while the power is engaged once the car stops to move. These are done with the interaction of the three parts.
To actuate the movement of a car, the three parts of the clutch would be driven by the motor to rotate, and the spring of the pressure plate makes it move forward in order not to push the clutch disc and keep the normal movements of the car.
When the car is about to stop, the spring causes the pressure plate to move backward to give pressure to the clutch disc. Once the clutch disc is compressed on the flywheel, it would produce friction, and thus disengage the power to the transmission system, so as to make the car stop.
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