A dual mass flywheel works by decreasing shaking when shifting the gears of a high-performance luxury car or a light-duty truck with a manual transmission and diesel engine. Dual mass flywheels work best when the engine is starting up and shutting down. Because dual mass flywheels allow for easier shifting, they contribute to improved fuel efficiency. They also help reduce transmission damage from prolonged use.
One kind of dual mass flywheel consists of springs, cushions, and a primary and secondary flywheel. It is made with a friction wheel between the two flywheels. The purpose of the friction ring is to lessen harm to the transmission from torque overload. Because it is a weaker part of the dual mass flywheel, the friction wheel deteriorates if it undergoes large amounts of engine torque load. Damper springs are located on the center support bearing of the two flywheels, working to absorb shock.
Another type of dual mass flywheel is made using planetary gears. Utilizing planetary gearing reduces the amount of fuel that is consumed because it decreases the idling revolutions per minute. It also assists with ease of driving and shifting. This type of dual mass flywheel is used with engines with substantial vibration at low RPM.