Views:0 Author:Site Editor Publish Time: 2021-04-30 Origin:Site
A dry clutch is one motorcycles part with a plate outside the engine casing. Dry clutch uses friction to engage and has no need for lubricant. Due to the increased friction, dry clutch tends to overheat quickly. To counter the problem, dry clutch has a large surface area to allow for optimal air cooling. Because dry clutch is not awash with oil, dry clutches deliver increased power to the rear wheel and less drag to the engine.
l How does dry clutch work?
l What are the advantages of dry clutch?
l What should be required when designing a dry clutch?
In a vehicle, we operate the dry clutch by pressing the dry clutch to peddle for disengagement of gears. Then springs get compressed and the pressure plate moves backwards. Now the clutch plate becomes free between the pressure plate and flywheel. Due to this now the dry clutch is getting disengaged and able to shift the gear. This makes flywheel to rotate as long as the engine is running and the dry clutch shaft speed reduces slowly and then it stops rotating. As long as the clutch peddle is pressed, the dry clutch is said to be disengaged, otherwise, dry clutch remains engaged due to the spring forces. After releasing the clutch pedal, the pressure plate comes back to its original position and dry clutch is again engaged.
In a normal condition a dry clutch is engaged with the engine. When a rider presses the clutch lever for changing gears, the coil springs in the dry clutch are compressed and the pressure plate expands which allows the stake of dry clutch plates to move independently. The stake of dry clutch is arranged in such a manner that friction plate and steel plate alternate. It makes the engine and dry clutch to move at different speeds. Ultimately the dry clutch disengages power to the transmission which allows rider to shift the gears.
l Dry clutch is very easy to replace as it is outside the case of the bike.
l Oil does not need to circulate for dry clutch, which ultimately eliminates reduction in loss of horse power due to oil circulation in dry clutch. It is the biggest reason why it is used in racing bikes.
l You can use friction modified oils in dry clutch.
l Dry clutch is easier to use but with shorter life.
l Dry clutch has smooth engagement and minimum shock during the engagement.
l Dry clutch can be engaged and disengaged when the machine is running since they have no jaw or teeth.
l Dry clutch is easy to operate.
l Dry clutch has ability to transmit partial power.
l Dry clutch can act as a safety device. They slip when the torque exceeds a safe value, thus safeguards the machine.
What should be required when designing a dry clutch?
l The actual contact surface of the dry clutch is the friction lining. Linings are subjected to severe rubbing during a machine run. There are many factors that decide the material for lining is viable or not. However, the lining material should have certain qualities.
l The materials of dry clutch should have a relatively high and uniform coefficient of friction under all service conditions.
l The materials of dry clutch have high resistance to wear.
l The materials of dry clutch should withstand a high compressive load.
l The materials of dry clutch should be chemically inert, oil and moisture have no effect on them.
l The materials of dry clutch should rapidly dissipate the heat generated, which have high heat conductivity.
l The materials of dry clutch should have excellent compatibility with cast iron facing.
l The coefficient of friction of contact surface of dry clutch should be high enough to hold the load with a minimum amount of axial force. It should not require an external force to carry the burden.
l The moving parts of the dry clutch should be lightweight to minimize the inertia load at high speed.
l Heat generated at contacting surface of dry clutch should dissipate rapidly.
l Dry clutch should have provision for taking up the wear of contact.
l Guard the projecting parts of dry clutch by covering and provide a provision for easy repair.
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