Application of WG type drum gear coupling:

The tooth profile curve of the WG drum gear coupling produced by the machinery manufacturer is an involute, its pressure Angle is 20 degrees, the number of teeth is generally 30-80, and the material is generally 45# steel or ZG310-570. The coupling transmission parts can transfer a large torque, and allow a large offset, installation accuracy requirements are not high, but high quality, high cost, widely used in heavy machinery. It is composed of two outer sleeves with inner teeth and flange and two inner sleeves with outer teeth. Torque transmission depends on internal and external teeth meshing. The tooth profile curve of the gear is involute, and the meshing Angle is 20 degrees.

WG type drum gear coupling working principle:

Warg-type drum gear coupling can transfer relatively large torque, and allow a large offset, for the installation of the accuracy of the two half coupling with outer teeth, two with inner teeth of the shell, the connection bolt is characterized by the tooth shape of the involute, generally Z=30-80 outer tooth apex ellipsoid, and after meshing with the inner teeth after the appropriate top and side gap, Large combined displacement is allowed. Oil is stored in the housing to lubricate the meshing gear. Due to the meshing transmission, the transmission torque is large, the manufacturing is difficult and the cost is high. Gear coupling is made up of the same number of teeth inner ring and flange half coupling with outer teeth and other parts. The outer teeth are divided into straight teeth and drum teeth. The so-called drum teeth is to make the outer teeth into a sphere. The center of the sphere is on the axis of the gear, and the clearance of the tooth side is larger than that of the general gear. Drum-tooth couplings allow for larger angular displacement (relative to straight tooth couplings), can improve tooth contact conditions, improve the ability to transfer torque, prolong service life. The tooth coupling consists of two outer coats with inner teeth and flanges and two inner sleeves with outer teeth. Torque transmission depends on internal and external teeth meshing. The tooth profile curve of the gear is involute, and the meshing Angle is 20°. This kind of coupling can transfer a large torque, and allow a large offset, installation accuracy requirements are not high, often used in heavy machinery. Two shells with inner teeth, two sleeves with outer teeth, the same number of teeth, the outer teeth into a spherical top of the waist drum teeth. The sleeve is connected with the shaft by a key, and the two shells are connected by bolts. Both ends are sealed and the cavity stores lubricating oil. Application for heavy duty transmission. The disadvantage is bulky structure and high cost.

To sum up:

The connection of WG drum gear coupling can be realized through a single key connection to connect the hub. For the coupling transmission, this connection mode is used in the working condition of medium low speed and small power, so the hub resistance is usually safe. However, in the case of high speed and high power, due to the limited extrusion resistance of materials between the key and the keyway, and the large stress concentration of the keyway, which is easy to fatigue, it is necessary to increase the diameter of shaft and the key connection specification greatly, resulting in the increase of the structural size of shafting parts. If double key connection is adopted, it will increase the dividing error of keyway and increase the difficulty of hub alignment. There are many large flue gas turbine units in China, which use keyless gear coupling for shaft connection.