News & Events

The role and install tips of the car flywheel

Update:03 Sep 2020

The car flywheel is a large disc-shaped part mounted on […]

The car flywheel is a large disc-shaped part mounted on the rear end of the crankshaft of the engine. It has a large moment of inertia. It has the following functions to store part of the energy of the engine's work stroke to overcome the resistance of other strokes and make the crankshaft rotate evenly . Through the clutch installed on the flywheel, the engine and the automobile transmission system are connected.

The role of the car flywheel:

1. Flywheel, a disk-shaped component with a very large running inertia, acts like an energy storage. For a four-stroke engine, work is done once every four piston strokes, that is, only the work stroke is done;

2. The three strokes of exhaust, intake and compression basically consume work. Therefore, the external output torque of the crankshaft changes periodically, and the crankshaft speed is not necessarily stable. To improve this situation, a flywheel is installed at the rear end of the crankshaft;

3. The flywheel has a large operating inertia. Because the work done by each cylinder of the engine is discontinuous, of course the engine speed also changes. When the engine speed increases, the kinetic energy of the flywheel is added to store the energy; when the engine speed decreases, the kinetic energy of the flywheel is reduced and the energy is released. The flywheel can be used to reduce speed fluctuations in the engine's rotation process.

Matters needing attention when installing the flywheel

(1) When installing the flywheel, the center line of the inner hole of the flywheel positioning circle and the center of the crankshaft spindle axis must be within the specified coaxiality tolerance range.

(2) The bolts used to fix the flywheel must be tightened in two crossovers during installation, and finally reach the specified torque to avoid loosening of the bolts during use.

(3) Before the flywheel is installed, the large diameter of the crankshaft and the end face of the flange, the threaded holes, and the positioning pin holes must be cleaned so that there is no residual dirt on the joint surface of the flywheel and the crankshaft to prevent excessive swing after the flywheel is installed.

(4) After the working surface of the flywheel is ground, it will inevitably cause the flywheel to lose its balance. Therefore, the flywheel should be checked and adjusted for dynamic balance to prevent the flywheel from vibrating when it rotates and accelerate the wear of all parts of the engine.

(5) After installation, you must check whether the timing mark on the flywheel is aligned.