Drum-toothed coupling is easily damaged by dry friction

There is dry friction between the tooth surfaces of the coupling:
If there is dry friction between the tooth surfaces of the coupling, it is necessary to carry out some relevant mechanical analysis on the drum gear coupling. We need to use the numerical method to calculate the additional force of the gear and carry out the experimental verification through the rotor simulation test bench. The results show that the existence of dry friction makes the additional force of the coupling change. As an important part of rotary machinery, the coupling not only plays the role of connecting two shaft segments to transfer torque, but also can compensate the error caused by installation, manufacturing and thermal deformation. Compared with other couplings, it has the characteristics of small volume, large transfer torque, etc., and has been widely used. However, in the process of transferring torque, there will be various vibration and wear. Especially in the case of high speed rotation vibration and wear serious.

The white vibration of drum gear coupling is summarized as follows:
Through a large number of tests and mechanical analysis of torsional and bending motion of the coupling shafting of drum gear coupling, the white excited vibration of the coupling is systematically summarized, and it is pointed out that the main reason for the excited vibration is the nonlinear stiffness of the coupling transmission parts. Friction of tooth surface; The misalignment of the inner and outer gears and the special structure of the floating body. In addition, Yamauchi, Aiya et al. made a nonlinear analysis of the bending vibration of the half-coupling system under the effect of friction on the tooth surface. From previous studies, it can be seen that the friction force on the tooth surface of the drum type coupling is the main cause of its wear and vibration. The additional force and torque of gear are calculated by numerical method. The additional torque of drum teeth is measured and compared with the calculated results. The meshing characteristic of the inner and outer gears of the coupling is multi-tooth meshing. Some teeth may be detoothed when the relative displacement of the inner and outer gears occurs. The modeling method and assumption of the mechanical model is to discrete the gear teeth along the axial direction and divide them into M segment elements, the width of each segment element is b, where b=BlM and B is the width of the teeth. In order to simplify the calculation, it is assumed that when the JTH segment element of the outer teeth is deformed in contact with the inner teeth, its deformation is equivalent to the normal of the contour of the dividing circle. The meshing tooth pair of each segment unit is regarded as a spring that is independent of each other and does not affect each other. The meshing stiffness is taken as an average value k, and the continuity of materials is ignored. Tooth error, deformation and original clearance are equivalent to the dividing circle treatment.

To sum up:
Mechanical manufacturers in the design of the drum gear coupling process, the relatively simple method is to design the drum curve of the coupling as an arc, our manufacturers will be the corresponding processing hob track circle called the drum circle, the radius is the radius of the drum circle. The drum curve of the coupling transmission is also designed to be composed of several circular arcs of different radii. The purpose is not only to meet the strength requirements, but also to reduce the thickness of the internal and external teeth due to the clearance requirements. The curvature radius of the tooth profile curve on the tooth profile on the dividing cylinder section. On the dividing cylinder section, the tooth profile curve can be elliptic or hyperbolic according to different processing methods, and the curvature radius of each point on it is changed.