What is Multi-Plate Clutch?- Diagram, and Working

What is Multi Plate Clutch?

The Multi Plate Clutch uses multiple clutch plates to make contact with the engine flywheel to transfer power between the engine shaft and the transmission shaft. A multi-plate clutch used in automobiles and machinery where high torque output is required.

It is a type of clutch that transmits more power from the engine to the transmission shaft of an automobile vehicle and also, makes up for the torque loss due to slippage. Multiple clutches consist of more than three discs or plates so that they can provide more torque output.

Multi-plate clutches are used in heavy vehicles with racing cars and motorcycles for transmitting high torque. As compared to single plate clutches, these are smooth and easy to operate due to their assembly of friction surface’s contact. It may be used where the space is very limited.

Read more About: What is Single plate Clutch?

Multi-Plate Clutch Diagram

Multi Plate Clutch Diagram
Diagram of Multi-Plate Clutch

Parts of Multi Plate Clutch

The components of all the clutches used in automobile vehicles are almost the same. But with some modifications, so let’s discuss the main parts of different types of multi-plate clasps used.

  1. Pressure Plate
  2. Clutch Plate
  3. Thrust Spring
  4. Clutch Paddle
  5. Inner Splined Sleeves
  6. Flywheel
  7. Diaphragm Spring
Parts of Multi-Plate Clutch
  • Pressure Plate: A plate attached to the splined sleeves which further connected to the pedal fulcrum. Such that when the clutch pedal pressed, the sleeves attached to the pedal fulcrum move outward, which in turn drives the pressure plate attached with this splined sleeve.
  • Clutch Plate: It is a metallic plate having frictional lines at its outer surfaces. It uses frictional contact with the flywheel to transmit power between the engine shaft and the transmission shaft.
  • Thrust Springs: These are springs used behind the pressure plate, and the stiffness of these springs is used by the pressure plate to maintain frictional contact with clutch plates, which in turn supports the clutch engagement.
  • Clutch Pedal: A clutch pedal operated by the driver of the vehicle used to control the engagement and disengagement of the clutch.
  • Splined Shaft & Inner Splined Sleeves: An outer splined transmission input shaft over which the complete clutch assembly. That includes clutch plates, pressure plates, inner splined sleeve, the clutch casing place and rotates with it.
  • Flywheel: It is part of the engine. We can also consider it as part of the clutch system as the transmission of power from the engine output shaft to the transmission shaft obtain by the frictional contact between a clutch and the flywheel of an engine.
  • Diaphragm Spring: In the diaphragm type clutch system, the thrust springs used in the spring type clutch replace with a single diaphragm type spring.

Construction of Multi Plate Clutch:

The multi-plate clutches construction is similar to a single plate clutches except for the number of clutches plates. The total number of clutch plates divides into two sets in which one from each set is alternatively arranges.

One set of the plate slides in grooves on the flywheel and the other one slides on splines on the pressure plate hub. These plates are reliably pressed by a strong coil spring and assembled in a drum. A Multi-Plate clutch works in the same way as the single-plate clutch by operating the clutch pedal.

As the number of clutch plates increases, the friction surfaces will also be increases. The increase in friction surface increases the capacity of the clutch to transmit more torque for the same size. The multi-plate clutches of small size transmit approximately the same torque as single-plate clutches of twice the diameter.

Working of Multi Plate Clutch

Engagement of Clutch

  • During the engaged position of the clutch, i.e., when the clutch pedal is not pressed.
  • The thrust springs do not move due to which the stiffness provided by these springs maintains the pressure over the pressure, the plate having friction lines on its inner surface.
  • Due to this pressure over the pressure surface, the frictional contact between the friction lines of the pressure plate and the friction lines of multiple clutch plates is maintained due to which frictional force is applied over the flywheel.
  • Due to this frictional force, the frictional contact between the various clutch plates and the wheel is supported, which in turn finally provides clutch engagement.

Disengagement of Clutch

  • When the clutch pedal is pressed, the fulcrum attached at its inner end rotates due to which the inner splined sleeve through which the pressure plate connects moves outward, which in turn applies pressure over the thrust springs.
  • Due to this force, the thrust springs move, which in turn releases the tension over the pressure plate, and finally, the frictional force between the pressure plate, clutch plate, and flywheel is removed.
  • For the reason that the removal of the frictional force, frictional contact between the pressure plate, clutch plate, and flywheel breaks, and finally the disengagement of the clutch obtained.

Types of Multi-Plate Clutch

These are various types of Multi-plate Clutches

  • Spring Type Multi Plate Clutch
  • Diaphragm Type Multi Plate Clutch
  • Hydraulic Operated or Automatic Transmission Clutch
  • Wet Multi Plate Clutch
  • Dry Multi Plate Clutch

1. Spring Type Multi Plate Clutch

Spring Type Multi-Plates Clutching the clutch, a cover attaches with a flywheel of engine use inside which the multiple clutch plates, pressure plates, thrust bearing, etc. packed. The clutch plates place over each other and mount over a splined shaft.

2. Diaphragm Type Multi Plate Clutch

It is the modified version of the spring-type multi-plates clutch. In which the thrust springs places circularly from the spring type clutch replace with a special crown-shape finger type spring called diaphragm spring.

3. Hydraulic Operated or Automatic Transmission Clutch

It is the modern type of clutches uses in vehicles fitted with automatic transmission, in this type of clutches a hydraulic device having highly compressed fluid operates with the accelerator pedal coupled with the multi-plate clutches.

The engagement and disengagement of the clutch obtained by the output given by the hydraulic device, which controls with the acceleration pedal.

4. Wet Multi Plate Clutch

Wet clutches, in general, have multiple clutch plates (in cars) and have a supply of oil to lubricate and cool the components. This type of clutch is located inside the engine casing.

The wet clutches are greatly amplified and therefore can cope with much higher torque inputs. Wet clutches are generally smaller in size.

The noise level in wet clutches is less when compares to dry clutches. The presence of oil between plates helps in managing the noise.

Wear and tear are very much less in the wet clutch. In a wet clutch, the lubricating oil keeps surfaces clean and provides smoother performance and longer life.

Wet clutches provide a better coefficient of friction, as the surface area increases due to the presence of multiple plates.

5. Dry Multi Plate Clutch

A Dry Clutch is a type of clutch that is not bathed in liquid (oil) and uses friction to engage. This type of clutch has its plate outside the engine casing. Usually, the dry clutch is larger to increase the surface area of the friction plate for optimal air cooling because it does get hot due to friction of the plate.

The level of noise in the dry clutch is more and keeps increasing as the clutch continues to undergo wear and tear.

Dry clutches have a single frictional surface to transmit the power between two plates. Therefore, they do not have a much better coefficient of friction.

In the dry clutch, the lubricant does not applies and hence the torque transmitting of these clutches is better. Dry clutches do not have an oil supply and are generally single-plate.

Application of Multi-Plate Clutch

  • It can be used in industrial machines and automobiles where high performance is required.
  • Due to the compact gearbox and high acceleration is required and the criteria for torque transfer are maximum, it can be used in motorcycle or drag racing races, as well as in F1 vehicles.
  • Due to the compact gearbox design, it can be used in ships, trucks, and locomotives.
  • It is suitable for heavy types of machines such as bulldozers, excavators, tanks and caterpillars, and others because the multi-disc clutch is heavy and produces high power. Because of this, the heavy machine parts easily lift heavyweights.
  • The multi-plate lock is used in heavy commercial vehicles to transmit high torque.
  • The multi-disc clutch is used where the required space in which the clutch has to be installed is much less than with motorcycles and scooters.

Advantages & Disadvantages of Multi-Plate Clutch

Advantages of Multi-Plate Clutch

  • Since the multi-plate clutches consist of more clutch plates, the ability to transmit the torque is quite high.
  • This type of clutch is small. Due to its compact size, the multi-disc clutch is suitable for all types of vehicles around the globe. Since the motorcycles and scooters only have limited space, the multi-plate clutch can be easily installed due to its compact size.
  • Compared to the single-disc clutch, the diameter of the multi-disc clutch is smaller than that of the single-disc clutch. Because of this function, the multi-disc clutch can be used in many sports such as racing and others.
  • The multi-plate clutches have many friction surfaces. Since the torque transmission depends on the number of friction surfaces, the torque is higher with the multi-disc clutch than with the single-disc clutch.
  • Because of the advantage of a higher torque rate, the multi-plate clutches can easily be used in heavy vehicles which are mainly used for commercial purposes.
  • Compared to a single-disc clutch, the multi-disc clutch helps the engine achieve better acceleration.
  • A force is required to depress the clutch pedal to make the clutch operational. Less pedal force is required to operate a multi-plate clutch.

Disadvantages of Multi-Plate Clutch

  • The weight of the multi-plate clutch is heavy and therefore not suitable for all-time use.
  • The cost of the multi-plate clutch, along with its maintenance work, is very high. So it is not good for the multi-plate clutch users on a budget.
  • Users have to spend additional money on the cooling medium. Because of this disadvantage, the maintenance cost automatically becomes high.
  • They heat up quickly.
  • Multi-plate clutches are heavy.
  • Multi-plate clutches are too expensive.

FAQs.

What is Multi-plate Clutch?

The Multi Plate Clutch uses multiple clutch plates to make contact with the engine flywheel to transfer power between the engine shaft and the transmission shaft. A multi-plate clutch is used in automobiles and machinery where high torque output is required.

What are the parts of Multi Plate Clutch?

Parts of Multi-Plate Clutch:

  1. 1.Pressure Plate
  2. 2.Clutch Plate
  3. 3.Thrust Spring
  4. 4.Clutch Paddle
  5. 5.Inner Splined Sleeves
  6. 6.Flywheel
  7. 7.Diaphragm Spring

What are the types of multi-plate clutch?

These are various types of Multi-plate Clutches

  1. Spring Type Multi-Plate Clutch
  2. Diaphragm Type Multi-Plate Clutch
  3. Hydraulic Operated or Automatic Transmission Clutch
  4. Wet Multi-Plate Clutch
  5. Dry Multi-Plate Clutch

What are the advantages of a multi plate clutch?

Advantages of Multi-Plate Clutch:

  • High torque transmission capacity.
  • Multi Plate Clutch has very compact size.
  • It decreases the weight of the clutch.
  • It is very much suitable for heavy vehicles.
  • It decreas the effort to put on pedals to operate the clutch.
  • It increases the acceleration.

What is difference between single and multi-plate clutch?

Difference between Single Plate Clutch and Multi Plate Clutch. As the name suggests, single plate clutch consists of a clutch plate whose both sides are coated with a frictional material. The multi-Plate clutch consists more than one clutch plate. Torque transmitting capacity is less.

How does a multi disc clutch work?

A Multi-Plate clutch works in the same way as the single-plate clutch by operating the clutch pedal. As the number of clutch plates increases, the friction surfaces will also be increases. The increase in friction surface increases the capacity of the clutch to transmit more torque for the same size.

What are the disadvantages of a multi plate clutch?

Disadvantages of Multi-Plate Clutch:

  • The weight of the multi-plate clutch is heavy so it is not suitable for all-time use.
  • The cost of the multi-plate clutch along with its maintenances is very expensive. …
  • As the number of frictional surfaces is more than the single-plate clutch, so more heat can also be generated.

What controls multi plate clutches?

Which is better dry or wet clutch?

Unlike dry clutches, wet clutches are covered in engine oil, which allows the clutch plates to cool. Because of this, wet clutches can sustain more abuse than dry clutches. Another reason wet clutches are a more popular choice is because they’re quieter at idle, which makes them better for stop-and-go traffic.

Which type of clutch is used in two-wheeler?

The multi-plate clutch is the most common clutch used in two-wheeler bikes.

Why do motorcycles use multi-plate clutches?

It gets complicated with bikes because space is so tight in across the frame 4-cylinder engines. If you were to have just two clutch plates, they would have to be massive to have enough surface area to create the friction necessary to transmit the power. So, most bikes have multi-plate clutches.

Why multi-plate wet clutches are widely used in motorcycles?

A multiplate clutch is more commonly used in two wheelers. The reason behind this is that two-wheeler engines are small and compact and are generally light in weight. To get minimum slip and maximum transmission of power, the frictional force between flywheel and clutch plate must be optimum.

What is a wet multi disc clutch?

A wet multi-plate clutch is an assemblage of steel driven plates and compound organic resin friction plates housed in a drum and spinning concentrically on a shaft. With respect to a “wet” clutch, the assembly is cooled by a limited amount of oil.

What is semi centrifugal clutch?

The semi-centrifugal clutch consists of levers and clutch springs and are arranged equally on the pressure plate. Springs of the clutch are designed to transmit the torque at normal engine speed and the centrifugal force helps in torque transmission at a higher speed.

What is a wet clutch?

Wet clutches are widely used in motorcycles and dirt bikes. The term simply means the clutch is lubricated with oil, as opposed to a dry clutch. Friction plays a big role in proper clutch operation.

Is a slipper clutch necessary?

They are not necessary as such but it’s a new clutch tech and who doesn’t like new tech. The slipper clutch makes the clutch pull lighter and improves downshifts. A slipper clutch limits the torque when you downshift that is applied to the rear wheel through the chain or belt drive.

Why do cars not have wet clutches?

On a car, the engine and gearbox run a separate sump, and the clutch sits in between as a dry unit. Being dry has the advantage of a better friction coefficient and not contaminating any oil. It’s cheaper too. Oil bath clutches are quieter, and better cooled.

In which clutch the pressure plate is used?

The clutch pressure plate is an important part of your manual vehicle’s clutch system. It is a heavy metal plate that is controlled by springs and a lever. Its main purpose is to apply pressure to the primary clutch plate (or clutch disc), holding it against the engine flywheel.

Do wet clutches last longer?

A wet clutch is called wet because it is actually wet with engine oil. The engine oil provides cooling as well as lubrication between the clutch cage and mating parts. Generally, a wet clutch will have a longer life and will take more abuse from the rider.