Reibpassung

Reibpassung refers to a type of interference fit where the surfaces of two mating parts are designed with specific tolerances that cause them to be slightly oversized or undersized, respectively. This intentional mismatch in dimensions, when the parts are assembled, creates a compressive force between them. This compressive force is what generates the frictional resistance that holds the parts together. The amount of interference, which is the difference between the maximum size of the outer part and the minimum size of the inner part, or vice versa, dictates the strength of the joint.

The principle behind reibpassung relies on the elastic deformation of the mating components. When the outer part is heated or the inner part is cooled, or both are combined with appropriate pressure during assembly, the interference is overcome. Once assembled and the temperature equalizes, the natural tendency of the materials to return to their original dimensions creates significant outward pressure on the inner part and inward pressure on the outer part. This pressure, acting over the contact area, generates the frictional force that resists relative motion between the parts.

Reibpassung is commonly used in applications where a strong, rigid connection is required without the need for fasteners like bolts or rivets. Examples include fitting gears, pulleys, and bearings onto shafts, or assembling press-fit components in automotive and machinery industries. The design of reibpassung involves careful consideration of material properties, desired holding force, and the assembly process to ensure a reliable and durable connection.