What Is Semi Centrifugal Clutch? – Construction, Working, Diagram

Explore the concept, diagram, construction, and working of semi-centrifugal clutches, their advantages and disadvantages, and the range of applications such as lawnmowers, go-karts, small tractors, and power tools.

What Is Semi Centrifugal Clutch?

Semi Centrifugal Clutch Diagram
Semi-Centrifugal Clutch Diagram

The Semi Centrifugal Clutch used in high-powered engines and racing car engines where clutch disengagements require appreciable and tiresome drivers’ effort. The power is transmitted partly by clutch springs and remaining by the centrifugal action of an extra weight provided in the system. The Springs are designed to transmit the torque at lower engine speeds, And Centrifugal force assists in torque transmission at higher engine speeds.

Centrifugal Clutch Video

Construction of Semi Centrifugal Clutch

Construction of Semi Centrifugal Clutch
Construction of Semi Centrifugal Clutch
  1. Three hinged and weighted levers and three clutch springs alternately arranged at equal space on the pressure plate(only one lever and clutch spring are shown in the figure).
  2. The flywheel is fitted to the engine crankshaft.
  3. The clutch plate is mounted on the splines of the clutch shaft.
  4. The pressure plate is freely supported on the clutch shaft.

⭐ Read More Articles – What Is Centrifugal Clutch?

Working of Semi Centrifugal Clutch

Working of Semi Centrifugal Clutch
Working of Semi Centrifugal Clutch

When the engine is at low speed the spring keeps the clutch engaged to transmit power, the weighted levers do not have any pressure on the pressure plate. When the engine is at high speed the weights fly off and levers exert pressure on the pressure plate which keeps the clutch firmly engaged to transmit high torque.

Thus instead of having more stiff springs for keeping the clutch engaged firmly at high speeds, they are less stiff because of the centrifugal forces of weighted levers, so the driver may not get any strain in operating the clutch. when the engine speed decreases, the weights fall and the weighted levers do not exert any pressure on the pressure plate only spring pressure is exerted on the pressure plate to keep the clutch engaged.

Clutch springs exert pressure on the pressure plate at low engine speeds. At high speeds, the centrifugal force developed by the rotation of weighted levers exerts pressure on the pressure plate.

Advantages Of Semi Centrifugal Clutch

  1. Smooth engagement and disengagement.
  2. Gradual increase in torque as engine speed increases.
  3. Simple and reliable design.
  4. Low maintenance.
  5. Suitable for small and medium-sized internal combustion engines.
  6. Cost-effective compared to other types of clutches.
  7. Can handle higher loads and speeds than other types of clutches of similar size.
  8. Can be used in a wide range of applications such as lawnmowers, go-karts, small tractors, power tools, and other small machinery.

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Disadvantages Of Semi Centrifugal Clutch

  1. Automatically disengaging at low engine speeds.
  2. Only at high speeds, centrifugal force is sufficient to keep the clutch in the engaged position.
  3. Springs has transmitted torque at low engine speeds.
  4. Centrifugal forces operate only at high engine speeds to transmit torque.

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Applications Of Semi Centrifugal Clutch

Semi-centrifugal clutches are commonly used in small and medium-sized internal combustion engines. They are typically found in applications such as lawnmowers, go-karts, and small tractors.

They are also used in some power tools and other small machinery. The semi-centrifugal clutch design allows for smooth engagement and disengagement of the engine and transmission and provides a gradual increase in torque as the engine speed increases.

⭐ Read More Articles – What Is Single Plate Clutch?

FAQ’s

What Is Clutch?

It is the most important part of the engine in an automobile. A clutch uses to transfer rotating motion or torque from one shaft to another shaft when requires. The torque developed by the engine at the initial speed is very low. Therefore it is impossible to start the engine under load.

What Is Centrifugal Clutch?

centrifugal clutch is a type of clutch that uses centrifugal force to connect two concentric shafts, with the driving shaft nested inside the driven shaft. In the fully centrifugal type of clutches, the springs are eliminated altogether and only the centrifugal force is used to apply the required pressure for keeping the clutch in the engaged position.

What Is Semi Centrifugal Clutch?

Semi Centrifugal Clutches are used in high-powered engines and racing car engines where clutch disengagements require appreciable and tiresome drivers’ effort. The power is transmitted partly by clutch springs and remaining by the centrifugal action of an extra weight provided in the system. The Springs are designed to transmit the torque at lower engine speeds, And Centrifugal force assists in torque transmission at higher engine speeds.

What is the purpose of a centrifugal clutch?

A centrifugal clutch is a mechanical device used on a powered rotary appliance. Typically used with a combustion engine, the clutch can be used to automatically transfer torque from drives to powered devices, which gives a “soft start” without any load engagement.

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