The WG drum gear coupling is a type of gear coupling, also known as the drum gear coupling. The so-called drum gear coupling is to make the external teeth into a spherical surface, with the center of the spherical surface on the gear axis. The side clearance of the teeth is larger than that of a general gear. Compared with the straight gear coupling, the WG drum gear coupling can allow a large angular displacement, improve the contact conditions of the teeth, and enhance the ability to transmit torque. To extend the service life, it features a contact state along the tooth width when angular displacement, and is composed of parts such as an internal gear ring with the same number of teeth and a flange half coupling with external teeth. The WG drum gear coupling is divided into two forms: Type I and Type II. Type I of the WG drum gear coupling is the type with a pressure cover, suitable for WG1-WG24. Its advantage lies in that the external teeth can be inspected and replaced by disassembling the pressure plate. The drawback is that the production process is complex, the weight is large and the price is high. The type II WG drum gear coupling is a type without a cover, suitable for WG1-WG14. Its advantage is its low price.
When the WG gear coupling is in operation, the two shafts generate relative angular displacement, and the tooth surfaces of the internal and external teeth periodically slide axially relative to each other, which inevitably leads to tooth surface wear and power consumption. Therefore, the gear coupling needs to operate under good sealing conditions. The radial dimension of the gear coupling is small and its load-bearing capacity is large. It is often used in the shafting transmission under low-speed and heavy-load working conditions. High-precision and dynamically balanced gear couplings can be used in high-speed transmission, such as the shafting transmission of gas turbines.
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