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1. Classification of sealing motion forms: can be divided into static friction and dynamic friction

1. Static friction is the friction generated when an object has a tendency to move relative to the surface of an object. The static friction force changes with the external force acting on the object.

2. Dynamic friction is the friction generated when an object moves relative to the surface of an object. At this time, the tangential force that hinders the movement of the object is called dynamic friction.

2. Classification of seal friction contact form: it can be divided into sliding friction and rolling friction

1. Sliding friction is the friction when the seal contact surface is relatively sliding.

2. Rolling friction is the friction when the sealed object rolls along the contact surface under the action of torque.

3. Classification according to the friction and lubrication state of the sealing surface: it can be divided into dry friction, boundary friction, fluid friction and mixed friction