Causes of coupling damage

Published: 2020-11-22

Coupling damage happens from time to time. What are the reasons for the rigidity and damage of drum gear couplings?Let's take a look together.

Drum-shaped gear couplings are rigid, flexible, and inelastic, so they are not suitable for machinery that requires damping, cushioning, and two-axis alignment.

1. Strong carrying capacity.Under the same outer diameter of the inner gear sleeve and the large outer diameter of the coupling, the load-bearing capacity of the drum gear coupling is 15-20% higher than that of the straight gear coupling on average.

2. The tooth end of the outer gear sleeve is in the shape of a horn, which makes the assembly and disassembly of the inner and outer teeth very convenient.

3. The drum-shaped tooth surface makes the contact conditions of the inner and outer teeth avoid the disadvantages of squeezing the edge of the straight tooth and stress concentration under the condition of angular displacement. At the same time, it reduces the friction and wear of the tooth surface, reduces the noise, and maintains it. The cycle is long.

4. Large angular displacement compensation.When the radial displacement is equal to zero, the allowable angular displacement of the spur gear coupling is 1°, and the allowable angular displacement of the drum-shaped gear coupling is 1°30. Under the same modulus, number of teeth, and width, the drum The angular displacement of the profile gear is larger than that of the straight tooth.

Drum gear couplingReason for damage:

1. When using couplings, the equipment in the shafting system, such as diesel engines, gearboxes, shafting and high-elastic couplings, must complement each other in design and use, and the level of design and manufacturing is relatively high. , The quality of the ship designed in this way is also very high.

2. The main reason is that the vibration damper of the main engine has sunk, which makes the shafting of the coupling appear asymmetry, thereby increasing the additional torque, which makes the highly elastic coupling in use When there is a breakage accident due to fever.

3. Because the use range of couplings is relatively wide, they are widely used in many industries.It may be improperly used in specific situations, or it may be used without consideration, which will also cause the coupling to be damaged during use.

The plum coupling is processed by machining methods such as turning, milling, and broaching, and then undergoes overall heat treatment.In order to determine sufficient mechanical strength, there is another type of claw plate on the market that is a casting, which can be mass-produced without processing loss.Couplings are also called couplings.A mechanical component used to firmly connect the driving shaft and the driven shaft in different mechanisms to rotate together and transmit motion and torque.Sometimes it is also used to connect shafts and other parts (such as gears, pulleys, etc.).It is often composed of two halves, which are connected by keys or tight fits, respectively, and fastened to the ends of the two shafts, and then the two halves are connected in some way.The coupling can also compensate for the offset (including axial offset, radial offset, angular offset or comprehensive offset) between the two shafts due to deformation or thermal expansion when manufacturing and installation are not working; and Alleviate impact and absorb vibration.Most of the commonly used couplings have been standardized or standardized. Under normal circumstances, it is only necessary to correctly select the type of coupling and determine the type and size of the coupling.When necessary, the load capacity of the vulnerable links can be checked and calculated; when the speed is high, the centrifugal force of the outer edge and the deformation of the elastic element need to be checked, and the balance check and so on are required.

Couplings have double-end tooth profile, single-end tooth profile, jaw type, leaf spring type, disc spring, cross slide type and roller chain type.Because of the different types, some are lubricated with lubricating oil, and some are lubricated with grease.The main coupling of the steel mill rolling mill refers to the cross slide universal coupling, which is a component of the rolling equipment, and the working conditions are harsh.The semicircular connecting copper slider will work under severe impact load and high pressure (the deflection angle of the connecting rod is often greater than 120), therefore, the plane and arc surface of the slider will be severely worn.

In addition, for flexible and toothed couplings, some are lubricated with grease.That is, when the coupling is working, it can be lubricated due to the squeeze of grease.When assembling, grease is applied to ensure sufficient lubrication inside.The grease used in the high-speed device must not separate the oil and soap under the action of centrifugal force, otherwise the coupling oil leakage will reduce the lubrication effect.At the same time, multi-efficiency is required, that is, heat resistance and fixed cold resistance when working at low temperatures.