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How The Coupling Works

Ningbo E.H Hydraulic Co.,Ltd | Updated: Jun 27, 2017

Coupling varieties, types, specifications a lot, in the correct understanding of the variety, type, specifications on the basis of their own, according to the needs of the transmission to select the coupling, the first has been developed from the standard for the choice of coupling, There are dozens of couplings developed for international and standard labels. Most of these standard couplings are universal couplings, universal couplings, each coupling has its own characteristics and suitable range, basic To meet the needs of a variety of conditions, under normal circumstances, designers do not need to design their own coupling, only in the existing standard coupling can not meet the needs of their own design when the coupling. Standard coupling easy to buy, the price than the design of non-standard coupling to be much cheaper. In the many standard coupling, the right choice for their own needs the best coupling, related to the mechanical product shaft drive work performance, reliability, service life, vibration, noise, energy saving, transmission efficiency, transmission accuracy, Economy and a series of problems, but also related to the quality of mechanical products. Designers in the selection of coupling should be based on the shaft from the shaft drive and the need to select the coupling, Scrow-on Couplings should avoid simply consider the main and driven side coupling selection coupling.

Select the coupling factor to consider

(A) mechanical characteristics of the power machine

Power machine to work machine, through one or several different varieties of type, the size of the coupling will be the main and driven together to form a shaft drive system. In the mechanical transmission, the power machine is nothing more than the motor, the internal combustion engine and the gas turbine. Due to the different working principle and mechanism of the power machine, the mechanical characteristics of the machine are quite different, and some of the operation is stable, and some have the impact of running, Scrow-on Couplings the influence of the transmission system is different. According to the mechanical characteristics of the power machine, the power machine is divided into four categories.

The mechanical characteristics of the power machine have a certain impact on the entire transmission system, different types of power machine, because of its different mechanical properties, should select the corresponding power factor Kw, select the best coupling for the system. The type of power machine is the basic factor in selecting the variety of couplings. The power of the power machine is one of the main basis for determining the size of the coupling, which is proportional to the torque of the coupling. Fixed mechanical products in the power transmission system are mostly motor, running mechanical products transmission system (such as ships, all kinds of vehicles, etc.) in the power engine for the internal combustion engine, when the power machine for the cylinder number of different internal combustion engine, you must consider the torsional vibration Transmission system, Scrow-on Couplings the impact of such factors and the number of internal combustion engine, the cylinder is related to the normal work. At this time should generally use the elastic coupling to adjust the natural frequency of the shaft to reduce the torsional vibration amplitude, thereby damping, cushioning, protection of transmission parts to improve the performance and improve the stability of the output power.

(B) the load category

Due to the different structure and materials, the coupling capacity of the mechanical products for each mechanical product is very different. The load category is mainly for the working load of the machine impact, vibration, Scrow-on Couplings forward and reverse, braking, Scrow-on Couplings frequent start and other reasons to form different types of load.

The load type of the transmission system is the basic basis for selecting the coupling type. Impact, vibration and torque changes in the larger working load, should be selected with flexible components of the flexible coupling that is elastic coupling to buffer, vibration, compensation axis offset, improve the transmission system performance. Starting frequent, positive and negative, the torque is normal when the normal smooth operation of the torque several times, is overloading work, will inevitably shorten the life of the elastic components of the coupling, the coupling only allows short-term overload, The overload shall not exceed 2 to 3 times the nominal torque, ie [Tmax] ≥ 2 to 3T n.

Low-speed operating conditions should be avoided only for small and medium power coupling, such as: flexible sleeve pin coupling, core-type flexible coupling, polygonal rubber coupling, tire coupling, etc .; need to control the overload Safety protection of the shaft, should use the safety coupling; load changes and a large impact, vibration of the shaft system, should choose a flexible component and cushioning and vibration effect better elastic coupling. Elastic Couplings with Elastic Couplings Elastic Couplings with Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings Elastic Couplings

(C) the permissible speed of the coupling

The allowable speed range of the coupling is determined by calculation based on the allowable linear velocity and maximum outer edge dimension of the coupling material. Different materials and varieties, specifications of the coupling allowable speed range is not the same, change the coupling material can increase the coupling allowable speed range, the material for the steel allowable speed is greater than the material for the cast iron allowable speed. For the n> 5000r / min working conditions of the coupling, should consider the outer edge of the coupling centrifugal force and elastic components such as deformation factors, and should be balanced. High-speed should not use non-metallic elastic components elastic coupling, high-speed deformation of the formation of flexible components, should use high-precision flexible coupling, the current foreign high-speed coupling is nothing more than diaphragm coupling and High precision drum gear coupling. Universal coupling

(D) the relative displacement of the coupling of the two axes

Couplings of the coupling shaft due to manufacturing errors, assembly error, installation error, shaft load and deformation, base deformation, bearing damage, temperature changes (thermal expansion, cold shrink), the relative movement between components And the relative displacement. Under normal circumstances, the relative displacement of the two axes is difficult to avoid, but under different conditions of the shaft drive generated by the displacement direction, that is, axial (x), radial (y), angle (α) and displacement The size is different. Only flexible couplings have the ability to compensate for the relative displacement of the two axes, Scrow-on Couplings so a large number of flexible couplings are selected in practical applications. Rigid couplings do not have compensation performance, the scope of application is limited, so the amount is very small. Corner (α) The only large shaft transmission should use universal coupling, axial movement, and need to control the axial displacement of the shaft drive, should be used diaphragm coupling; only the accuracy is very High choice of rigid coupling

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