Hello Buddies..!! Happy to see you here. Well, I have a Quick question for you. Yeah, have you ever come up with a situation like when you are Riding your Motorcycle at Higher Speeds and Encountered a sharp Cornering 🙁 ?? If Yes, What would you do immediately?? The Obvious reaction would be Hard Braking and Downshift to the Lower Gear by 1-2, Right?? What happens when this situation comes when you are riding a Motorcycle which doesn’t have Slipper Clutch. Well, you will end up with a lot of friction in the clutch which will ultimately damage the clutch, Gearbox and be putting yourself at Risk which arises because of Engine Braking Force.
Here comes the situation where we need SLIPPER CLUTCH ( Back Torque Limiter Clutch) which avoids these bad scenarios. This Slipper Clutch is designed in such a way that it helps by allowing the clutch to partially slips until your engine speed matches with your own speed.
STANDARD CLUTCH VS SLIPPER CLUTCH
How Does a Standard Clutch Works:
On very early Machines the engine is connected to the rear wheel directly. So whenever you want to change the gear you need to stop the Engine. So later clutch was introduced into the motorcycles. The transmission is connected to the rear wheel through drive mechanism usually chain or belt. The clutch separates the running engine from the rear wheel to rotate. The clutch transmits the power to the rear wheel via gearbox thus by connecting the crankshaft and the transmission. So whenever you pull the clutch it will disengage the running engine and the rear wheel and make the engine run freely. In this moment the clutch also helps in allowing to change the gear ratios according to the speed.
Technical Working of Clutch:
Imagine a circular Friction plate is connected to the Crankshaft and a steel plate is connected to the gearbox. The friction plate rotates along with the crankshaft and it is pushed against the steel plate and thus making the steel plate to rotate which in turn makes the rear wheel to rotate thus transferring the power from transmission to rear wheel.
The friction plate and the steel plate are pushed against each other by clutch springs. When you pull the lever in you can slacken the pressure from the springs thus by creating a slight gap and Slip will occur allowing the engine to rotate freely without rotating the Gearbox shaft. In the Modern bikes instead of this two plates, a set of gear shaft’s steel plates are sandwiched between the crank shaft’s friction plates. In the Modern bikes instead of this two plates, a set of gear shaft’s steel plates are sandwiched between the crank shaft’s friction plates.
Slipper Clutch is usually placed in high displacement Motorcycles. I’ll let you know what actually happens, In high compression engines some amount of charge is produced during the compression stroke and the crankshaft has to fight against the charge to push the piston up which produces resistance in the form of Engine Braking or Back Torque. When the rider decelerates or downshift, the engine braking gets more pronounced.
The reason this happens because the rpm of the engine and the rear wheel doesn’t match. Its found that when you enter a corner and downshift to the taller gear ( Taller Gear always rotates slower than smaller gear) the rpm of the rear wheel will be higher than the Engine rpm and due to this resistance will be offered by the engine ( Engine Braking).
The function of the slipper clutch is quite similar to the simple friction clutch but major role of slipper clutch happens when you let off the throttle while cornering and downshifting to the lower gear and when the rear wheel tries to roll faster than the engine, then the slipper clutch allows a certain amount of slippage in the opposite direction letting the rear wheel to spin relatively freely from the engine drag. This slipper clutch allows the partial slip until the engine speed matches the rear wheel speed.
Image Source: www.zigwheels.com
The Slip is very crucial in the slipper clutch design. We cannot see any change in the bikes equipped with the slipper clutch if the slip is not arranged well.
Advantages of Slipper Clutch:
- The slipper clutch prevents the wheel locking when the Engine Braking occurs when you downshift to lower gears.
- Slipper clutch reduces the sudden forces in the gearbox and eventually reduces the wear and tear of the gearbox.
- This technology reduces the stress and pressure on the suspension by absorbing the Engine Braking force. This leads to comfort and confidence in riding especially when cornering.
- One can concentrate on other things like braking, body poster rather than concentrating on the clutch operations.
Disadvantages of Slipper Clutch:
There are no considerable disadvantages of slipper clutch practically but we need attention on some aspects:
- In some cases, the installation of slipper clutch will be more critical mechanically.
- we cannot find desired results if slipper clutch not installed properly
- Sometimes Engine Braking is required to bring the bike to the standstill position which is completely against the Slipper Clutch Technology.
Latest Bikes Equipped with Slipper Clutch:
1. Kawasaki Ninja 300:
2. DUKE 390:
3. KTM RC 390:
4. Dominar 400:
Do watch this Video for Visual understanding of Slipper Clutch
Hope you people got enough information on Slipper Clutch. If you have any doubts do comment below.
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