Drum type gear coupling alignment method

Published: 2021-03-26

Drum-type gear couplings should be aligned. The accuracy of the alignment is related to the normal operation of the equipment, which is especially important for high-speed equipment.

The alignment method of the drum gear coupling is to adjust the base of the motor to make the reading values ​​of the dial indicator of the 4 phase points close to meet the allowable deviation value of the design and installation requirements, so as to realize the installation and alignment of the coupling.Drum gear couplingIt is a mechanical part that connects two shafts (the driving shaft and the driven shaft) to rotate together to transmit torque, and rotates together without disengaging in the process of transmitting motion and power.In addition, the drum gear coupling also has the functions of compensating the relative displacement of the two shafts, buffering and damping vibration, and protecting.High attention should also be paid to the installation and alignment of the coupling. Accurate alignment of the two shafts, that is, the center lines of the two shafts are completely on the same straight line, is difficult to achieve. Therefore, it is difficult for equipment that requires continuous operation to always maintain accurate alignment. .

The uneven thermal expansion of various parts, the deflection deformation of the shaft, the uneven wear of the bearing, the displacement of the equipment and the uneven sinking of the foundation, etc., are all factors that make it difficult to maintain the alignment of the two shafts. Therefore, in the equipment It is stipulated that there is an allowable deviation value for the centers of the two shafts during installation.From the perspective of assembly, as long as the coupling can reliably transmit torque, the greater the allowable deviation of the center of the two shafts, the easier the installation; but from the perspective of installation quality, the smaller the deviation of the center line of the two shafts, the operation of the equipment The better, the longer the service life.Therefore, the alignment accuracy should be improved so that the installation alignment accuracy value is better than the allowable deviation value.

When replacing bearings, gears, or other parts in a drum gear coupling for motors, gearboxes and other shafts, it is often necessary to disassemble the coupling. After the coupling and the shaft shoulder are positioned, The disassembly space for drawing the coupling will be very narrow. For example, the two ends of the coupling are processed separately to facilitate the disassembly of the coupling, and the coupling will not be deformed or damaged during the disassembly process.After the driving end and the driven end of the drum gear coupling are connected, the alignment mark is engraved in the axial direction of the flange cylindrical surface. When the coupling is disassembled and reinstalled, it is convenient to penetrate the hinge of the coupling connection. Hole bolts.

Drum-shaped gear couplings are evolved from the development of ordinary straight-tooth couplings. Drum-shaped gear couplings have various standards and series of products in many industries. They consist of two drum-shaped external gear sleeves and one For components such as the straight tooth inner gear ring, the torque is transmitted by the meshing of the inner and outer teeth, and the axis of the straight tooth inner ring gear of the drum-shaped outer gear sleeve is oscillated (called angular displacement) to compensate for the two transmission axes. The relative offset.The greater the bulge in the length of the tooth, the greater the angular displacement.From the perspective of bending strength and load-bearing capacity, the transmission torque of the drum gear coupling can be increased by 23% under the same working conditions.

The bulge in the tooth length direction makes the tooth pair contact better. Therefore, the drum gear coupling has the advantages of large transmission capacity, large angular displacement, stable transmission, high efficiency and long life.The drum gear coupling is composed of an inner 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. Drum-shaped gear couplings Large angular displacement can be allowed, tooth contact conditions can be improved, torque transmission ability can be improved, and service life can be prolonged. The contact state along the tooth width when the drum-shaped gear coupling has angular displacement.

The internal structure of the drum gear coupling is very complicated, and the materials used can meet the requirements of torque and speed.The drum gear coupling has high strength and toughness, good hardenability, no obvious temper brittleness, small deformation during quenching, high fatigue and multiple impact resistance after quenching and tempering, low temperature impact Good toughness, high creep strength and strength at high temperature.The lubricating oil of the drum-shaped gear coupling is sprayed into the small holes at the bottom of the gear teeth, and the oil enters the meshing surface under the action of centrifugal force to play the role of lubrication and cooling.The oil flows out from both sides of the tooth after passing through the meshing surface. With this type of lubrication, the oil flows continuously and the magazine flows out.

After we spray the lubricating oil, the pressure caused by the centrifugal force enters the gear tooth meshing surface, so it has a better lubrication and cooling effect, and is suitable for high-speed and heavy-duty occasions.The lubricating oil is injected from the nozzle. Because the lubricating oil is subjected to the centrifugal force to maintain the lubricating oil layer on the outer circle of the gear during rotation, this lubrication method will leave the magazine in the ring gear, and the heat dissipation effect of the oil flow is also poor, so only Suitable for occasions with low power and low speed.After we use it, we need to maintain it frequently before it can be used for a long time.