Tooth coupling and straight tooth coupling

The gear coupling is composed of internal gear ring with the same number of teeth and flange half coupling with external teeth. The external gear is divided into straight gear and drum gear. The so-called drum gear is to make the external gear into a spherical surface. The center of the spherical surface is on the gear axis. The backlash between the teeth is larger than that of ordinary gears. The drum gear coupling can allow greater angular displacement (relative to the straight gear coupling), improve the contact condition of the teeth, improve the ability to transmit torque, and extend the service life. When the gear coupling is working, the two shafts will produce relative displacement, and the tooth surfaces of the internal and external teeth will periodically make axial relative sliding, which will inevitably lead to tooth surface wear and power loss. Therefore, the gear coupling needs to work under the condition of good lubrication and sealing.

The gear coupling has small radial size and large bearing capacity. It is commonly used for shafting transmission under low speed and heavy load conditions, such as metallurgy, mining, lifting and transportation industries, and also for petroleum, chemical, general machinery and other industries. The high-precision and dynamically balanced gear coupling can be used for high-speed transmission, such as the shafting transmission of gas turbine. As the angular compensation of the drum gear coupling is greater than that of the straight gear coupling, the drum gear coupling is widely used at home and abroad, and the straight gear coupling should not be used as much as possible.