The structure of the drum gear coupling

Published: 2021-03-20

Drum-type gear couplings are rigid-flexible couplings, with radial, axial and angular axis deviation compensation capabilities. Compared with CL-type straight gear couplings, it has a compact structure, small turning radius, It has the advantages of large carrying capacity, high transmission efficiency, low noise and long maintenance period. GICL, GIICL series drum gear couplings are especially suitable for low-speed and heavy-duty working conditions, such as metallurgy, mining, lifting and transportation industries, and also suitable for shafting transmissions of various machinery such as petroleum, chemical, and general machinery.

Good lubrication is a necessary guarantee for the safe and reliable operation of the drum gear coupling, as well as a necessary condition for reducing wear.

Drum type gear couplingIt is composed of internal gear ring with the same number of teeth and flange half coupling with external teeth.The external teeth are divided into straight teeth and drum teeth. The so-called drum teeth means that the external teeth are made into a spherical surface. The center of the spherical surface is on the gear axis. The tooth side clearance is larger than that of ordinary gears. Drum-shaped gear couplings Large angular displacement can be allowed, the contact conditions of the teeth can be improved, the torque transmission ability can be improved, and the service life can be extended.The contact state along the tooth width when there is an angular displacement.

Under the conditions of sufficient tooth root bending strength and tooth surface contact strength, the tooth width should be determined with a larger degree of overlap, and the tooth width should not be increased blindly to avoid unnecessary increase in the structural size.The general tooth width factor is 8-14.The minimum tooth width should be determined by the allowable root stress, and the width required for the displacement of the force point along the tooth width caused by the inclination of the shafts should also be considered.

At the bottom of the tooth groove of the external gear, an oil hole communicating with the oil collecting groove is drilled, and the centrifugal force generated by the high-speed operation of the drum-shaped gear coupling is used to spray the oil into the meshing part of the internal and external teeth to make it fully lubricated.Conducive to the operation of the coupling and prolong its service life.

The gear coupling is composed of an internal gear ring with the same number of teeth and a flange half coupling with external teeth.The external teeth are divided into straight teeth and drum teeth. The so-called drum teeth means that the external teeth are made into a spherical surface. The center of the spherical surface is on the gear axis. The tooth side clearance is larger than that of ordinary gears. The drum-shaped tooth coupling can Allows a larger angular displacement (compared to the straight tooth coupling), which can improve the contact conditions of the teeth, increase the torque transmission capacity, and extend the service life.When the gear coupling is working, the two shafts produce relative displacement, and the tooth surfaces of the internal and external teeth periodically slide relative to each other in the axial direction, which will inevitably cause tooth surface wear and power loss. Therefore, the gear coupling needs to be well lubricated and sealed. Work in the state.

The torsional vibration of the gear coupling is analyzed and researched. The torsional vibration of the gear coupling is analyzed by using the Fourier series solution method and the gap, damping, and excitation force as parameters. The torsional vibration of the gear coupling is then analyzed; A large number of tests have been carried out on the axial vibration of the gear coupling connecting shaft system, and the main reason for the axial vibration is qualitatively explained. It is pointed out that the axial vibration is mainly caused by the misalignment and the frictional force of the tooth surface. Larger axial movement will occur when there is no axial restoring force or thrust bearing.

Vibration analysis is one of the techniques for predicting coupling misalignment. It can judge the gradual change trend of the equipment state, but when judging whether a piece of equipment is in a misalignment state, it needs to have a lot of past data and examples for reference, and there are differences. The problem is the bearing, lubricating oil, coupling, or the fixed connection, so there are certain limitations.Infrared photography technology can distinguish overheated parts such as bearings, motor housings, couplings, etc. when the equipment is in poor condition, and determine the alignment error of the coupling, and combine it with other prediction technologies such as vibration analysis. , Its effect will be better.

Through experiments on high-speed rotating steam turbine generators and blowers, the bending vibration caused by the gear coupling is briefly explained; under the conditions of different parameters such as unbalance, lubrication conditions, clearance, error, and load, etc. The gear coupling connecting shaft system has been subjected to a bending vibration test; in addition, the bending vibration of the half coupling system is analyzed under the action of dry friction on the tooth surface. The vibration of the gear coupling is mainly related to the internal and external vibrations. Gear misalignment is related to tooth surface friction, and special attention should be paid to tooth surface lubrication in the case of high-speed rotation.