A series of problems will occur in the transmission process of gears. There are many kinds of gears. The general structure of gears includes gear tooth surface, normal surface, addendum circle, tooth groove, end face, root circle, base circle, scale circle, gear fracture and assembly error due to plastic deformation of tooth surface that may occur in gear transmission. So what caused this error?

Plastic deformation of tooth surface occurs during gear operation. When the gear structure material is soft and the transmitted working load changes greatly, the plastic deformation of the tooth surface is easy to occur. Under the interaction of excessive friction between tooth surfaces, the different stresses in contact with tooth surfaces will exceed the extrusion yield strength limit of other materials, and the tooth surface materials can enter a plastic development state, resulting in the plastic flow of tooth surface metal. As a result, a concave groove is formed on the tooth surface of the driving through gear near the pitch line, while a convex edge is formed on the tooth surface of the driven gear near the pitch line, thus damaging the tooth profile. Sometimes, there is no "flash burr" on the driven tooth surface of the selected gear in some data types. In severe cases, the extruded metal will fill the top clearance as metal, which will cause severe vibration, and even time bending or fracture may occur, affecting the normal meshing and transmission of the gear system.

Manufacturing error: typical errors commonly encountered in gear processing, such as eccentricity, pitch error, basic pitch error and tooth profile error. Gear deformation caused by fixing error and internal stress of heat treatment. When the gear error is large, it will cause slight inertial interference of the gear transmission, which will make the gear transmission rotate slowly and quickly, and cause impact, vibration and noise when the gear pair is engaged.

Gear fracture: In gear transmission, the driving force and reaction force of driven gear interact on each other's gear through contact points. Even if there is no impact load, under the action of alternating load, fatigue cracks are easy to occur when the stress is concentrated, and fatigue fracture occurs at the root of the tooth. In addition, due to manufacturing and installation errors, quenching cracks, grinding crack damage and too thin tooth thickness after severe wear, fracture may occur at any part of the gear teeth.

Assembly error: due to the assembly information technology and assembly design methods, the contact of one end or the straightness deviation of the gear shaft will cause uneven load bearing capacity of different gears, resulting in the overload of individual gear teeth, causing local early wear, and even not causing gear teeth fracture in serious cases. The imbalance of gears will cause huge impact, vibration and noise.

The above is an introduction to the faults of gear transmission. If you need gear processing, please consult the iHF Hefa gear manufacturer.