The development and status quo of gear couplings and the causes of wear failures

　　With the development of machinery industry and science and technology, higher requirements are put forward for coupling.It must not only meet the requirements of high speed, heavy load, and high precision, but also meet the requirements of smooth operation and high transmission efficiency.Long service life and simple maintenance requirements.With the development of machinery industry and science and technology, the requirements for couplings are getting higher and higher.It must not only meet the requirements of high speed, heavy load, and high precision, but also meet the requirements of stable operation and high transmission efficiency.Long service life and simple maintenance requirements.In order to meet the needs of the market and different transmission systems, many new gearboxes have been developed to meet this demand.In recent years, the gear coupling industry has developed rapidly and the standardization level is also high. There are only more than 90 coupling regulations in the industry.With so many specifications, it will undoubtedly play a great role in promoting the application and consumption of couplings, and at the same time provide advanced technology for the market, and reliable quality guarantees the quality of coupling products.The number of gear coupling specifications far exceeds that of foreign advanced industries.Since they are presented in the form of samples of consumer manufacturers, there are very few established or industrial specifications.And the technical level of the coupling, whether it is the structure type, technical parameters and performance indicators, they mostly reach the level of similar foreign products.However, there is a big gap in product processing accuracy, quality and service life, and some can only reach the level of the 80s.The reason is related to the way, scope and management of the organization of consumption; second, the processing equipment is outdated, the consumption efficiency is low, and the processing accuracy is poor. Before the 20s, the consumption of anthracite in my country was consumed by manufacturers, and there was no professional coupling manufacturer.However, after the 80s, the consumption of couplings gradually moved to the market and developed very rapidly, forming a group of large and small professional consumer manufacturers with an annual output value of more than 20 billion US dollars.

　　Wear is a common defect of gear couplings.During operation, there is relative sliding between the inner gear ring and the outer gear ring of the coupling, which is the basic cause of wear.Other causes of coupling wear are:

　　Poor manufacturing process

　　The tooth profile error of the inner and outer ring of the coupling with good processing technology is small, and the rotating torque transmitted by the coupling can be evenly distributed on each tooth; the gear ring of the coupling with poor processing technology is not uniformly stressed, resulting in excessive force on individual teeth .This can cause wear and tear, and in severe cases can lead to tooth fracture.

　　Poor lubrication

　　Since the two rotating parts connected to the gear coupling have axial movement during rotation, the coupling must have good lubrication.Poor lubrication or lubrication loss will inevitably increase the friction between the inner and outer teeth of the coupling, and long-term operation will cause the wear of the coupling.

　　Improper use of materials or improper surface heat treatment process

　　Tooth surface coupling is usually carried out to improve its surface hardness and wear resistance.However, due to improper heat treatment process, insufficient hardness of the inner and outer tooth surfaces of the coupling, and poor wear resistance of the inner and outer tooth contact surfaces, resulting in coupling wear.

　　Installation deviation

　　When the unit is installed, the end face of the drive shaft and the center of the driven shaft will deviate.When the deviation exceeds the allowable range of the gear coupling, the main oil pump will form a conical swing with the turbine rotor, resulting in the main oil pump bushing and thrust.The tiles even bear the load of the hydraulic adjustment system.

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