Gear coupling

The gear coupling is a commonly used mechanical part in gear reducers for transmitting torque. It consists of two parts: the driving shaft and the driven shaft. Most power machines are connected to the working machine through it. When the gear coupling is under load, the tooth surfaces generate friction and heat due to the slight reciprocating motion. This is particularly evident under high-speed conditions. If the lubrication is improper, the tooth surfaces will rapidly wear out or even fuse together. Therefore, the condition of lubrication must not be ignored during design.
The lubrication methods of the gear coupling generally include the following three types:
Oil storage type lubrication. The lubricating oil is sprayed in through the nozzle. Due to the centrifugal force during rotation, the lubricating oil maintains a certain layer on the outer circumference of the gear. This lubrication method will cause the oil to remain on the gear ring and the heat dissipation effect of the oil flow is poor. Therefore, it is only suitable for situations with low power and low speed. There is another type of non-flowing oil storage lubrication method, which is to inject the lubricating grease into the interior and seal it, and then replace it regularly.
2. Gravity-fed lubrication. The lubricating oil is sprayed through a nozzle, flows through the side clearance of the gears, and exits through small holes in the sleeve. This lubrication method mainly serves the purpose of cooling and is difficult to form an oil film. The tooth surface wears out faster than in the following high-pressure lubrication.
3. Strong lubrication. The lubricating oil is sprayed into the small holes at the bottom of the gear teeth. The oil is then drawn into the meshing surface by centrifugal force, serving both lubrication and cooling purposes. After passing through the meshing surface, the oil flows out from both sides of the teeth. This type of lubrication ensures continuous circulation of the oil flow, and contaminants are discharged along with it. Moreover, the sprayed lubricating oil, under the effect of centrifugal force, creates a certain pressure and enters the meshing surface of the gear teeth, thus achieving a better lubrication and cooling effect. It is suitable for high-speed and heavy-load applications.