Analysis of gear reducer transmission failure causes
Gear reducer gear fracture is the most serious situation in the whole mechanical engineering, mainly including overload fracture, fatigue fracture and random fracture. In this case, the broken tooth is usually located at the root of the gear, and the broken tooth is usually flat and rough.
Fatigue fracture refers to the fatigue crack that appears at the root of the gear under long cycle and high circumferential fatigue conditions, and its fracture can be divided into fatigue fracture surface and final fracture surface, and no plastic deformation occurs during the fatigue fracture. Fatigue fracture zone, fatigue fracture may occur at the end of the gear. Random fracture usually occurs at the root of the gear, but special cases occur elsewhere.
There are many measures to prevent gear fracture in order to reduce the stress concentration at the root, increase the fillet radius of the root, and eliminate the cutting marks in the root machining. The stiffness of the shaft and support can also be increased to reduce local stress, and treatments such as shot peening and cold rolling can be carried out to improve the tooth surface.
Adhesive wear mainly refers to lubrication. If the lubricant layer is thick, then the contact between metals will be reduced and there will be no wear. If the oil film temperature and pressure are the same, then the oil film viscosity is high and there is little wear. In the case of low speed, heavy load and maximum temperature, the oil film may be damaged in this case, most of the wear will occur except for the tooth surface of the gear. Wear can be improved by increasing surface hardness, reducing surface roughness and increasing lubricant viscosity.