Coupling shaft hole matching standard

　　Standard of shaft hole fit

　　In the process of maintenance or installation of mechanical equipment, it is often encountered that the coupling hole and the shaft center are too tight.It is often difficult or impossible to disassemble the coupling.In response to this kind of problem, our method is to reduce the basic deviation of shaft elongation through various couplings, so as to reduce the waste of manpower and material resources in the maintenance of mechanical equipment.According to the "Machine Design Manual", the matching requirements of the coupling hole and the shaft are as follows: Diameter d≤mm≤6≤30, >30≤50, >50 Matching code: H7≤J6, H7≤K6, H7/M8 Note: 1.It is appropriate to use H7≤R6, or H7/N6 under heavy load, forward and reverse, shock, vibration and other situations. 2.2. When using H7/R6 or H7/M6 to match the coupling hole with the motor or reduction shaft, process the hole according to the configuration deviation.According to the above regulations, the fit between the coupling hole and the shaft with d>50 mm should be H7/M6.Heavy load, shock, and vibration should be H7≤R6, the actual maintenance is the same.For example, the coupling hole fit between the reducer and the roller shaft is H7≤R6, which is an interference fit, such as the conveyor roller table of the billet continuous casting in the steelmaking plant, the coupling hole between the reducer and the roller shaft and the roller Shaft matching.During use, the rolls undergo high-temperature baking, abrasion and spray cooling, and the replacement time is not long.At this time, the outer gear sleeve of the coupling may have been disassembled and continue to be used, but it cannot be disassembled because it is too tight and must be replaced with a roller.Since the coupling is provided in a complete set of equipment, even if only a part of the coupling assembly is used, a complete set of costs is required.In this way, the cost of spare parts consumption is particularly high.The shaft deviation of the coupling is changed from the original R6 to the current G6, so that the original interference fit is changed to the current clearance fit, which does not affect the use of the equipment, but also reduces the maintenance cost of the equipment.In fact, the selection of the inner hole of the coupling and the shaft center is a very complicated and important task.In the future life, we can choose the fit of the inner hole of the coupling and the shaft according to the above method.

　　There is lubrication inside the linear spring pin coupling bushing, which is prone to lubrication.The linear springs are arranged in an orderly manner in the cup sleeve and must not be secondary springs.There is a space between the spring plate and the cover plate to store grease and make up for the loss of grease.The half coupling is equipped with a sleeve higher than the spring pin to reduce profit concentration, prevent the pin hole from collapsing, and increase the service life of the coupling.

　　In order to improve the matching compensation of the linear spring pin and withstand the starting shock, variable load shock and absorbing vibration, the matching compensation ability is adjusted by changing the number, length and diameter of the straight line.The oil film is formed by filling the oil in the coupling spring and the hole in the spring pin to reduce wear and increase damping, thereby achieving the purpose of compensating and absorbing vibration.

　　The flexible element of the coupling should not be used for axial adjustment.The gasket set on the high-performance coupling is used to deal with length errors during installation.Couplings with a diameter less than 6 inches (152 mm) usually allow a length error of +062 inches (+1.58 mm), while a coupling with a diameter greater than 6 inches (152 mm) allows a length error of +0.125 inches (+3.2 mm) ).The gasket should be evenly distributed on both ends to maintain the integrity of the flange guide rod.

　　The matched surface roughness refers to the small processing surface distance, small peak value, and uneven grooves and valleys.There are many types, types and specifications of the fitter.On the basis of a correct understanding of the concept of varieties, types, specifications, etc., choose the fitter according to the needs of the transmission system.They are first selected from the fitters that have been developed as standard.At present, there are more than ten kinds of standard adapters in our country, most of which are universal adapters.Each fitter has its own characteristics and scope of application, and can basically meet the needs of various working conditions.Under normal circumstances, the designer does not need to design the fitter by himself.Only when the existing standard fits cannot meet the needs of designing their own fits.Standard couplings are easy to purchase.

　　The surface roughness of the coupling refers to the small spacing and small peak and valley roughness of the machined surface.The distance between the two peaks and valleys is very small (less than 1 mm), which is difficult to distinguish with the naked eye, which is a micro geometric error.The smaller the surface roughness, the smoother the surface.The surface roughness has a great influence on the performance of mechanical parts.

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