Slewing bearing with external gear vs slewing bearing with internal gear

The slewing bearing is a large bearing that can withstand the combined load and can withstand large axial, radial loads and overturning moments. The slewing bearing usually has a mounting hole, an internal gear or an external gear, lubricating oil holes and a sealing device, so that the design of the main body is compact, the guiding is simple, and the maintenance is easy. There are toothless slewing bearings, slewing bearing with external gear and slewing bearing with internal gear. Slewing bearings are widely used in large-scale rotary devices such as lifting machinery, mining machinery, construction machinery, port machinery, ship machinery, and high-precision radar machinery and missile launchers. At the same time, we can design, develop and produce various special structure slewing bearings according to the specific requirements of users.

This is the content table of the article：

—  What is slewing bearing with external gear?

—  What is slewing bearing with internal gear?

—  Different specification and structure of them

—  Summary

What is slewing bearing with external gear？ 

It is a slewing bearing with a tooth on the outer ring. It is a large bearing that can withstand the combined load and can withstand large axial, radial and overturning moments. Generally, it has mounting holes, internal gears or external gears, lubricating oil holes and sealing devices, which makes the mainframe design compact, easy to guide and easy to maintain. The slewing bearing is also called the slewing bearing, and some people also call it: the rotary support and the gyro support. Widely used in: truck cranes, railway cranes, port cranes, marine cranes, metallurgical cranes, container cranes, excavators, filling machines, and CT standing wave therapy devices, nautical instruments, radar antenna mounts, missile launchers, tanks , robots, and rotating restaurants.

What is slewing bearing with internal gear？ 

It is a slewing bearing with a toothed inner ring. It is also capable of withstanding large loads of combined loads and can withstand large axial, radial and overturning moments. It also has mounting holes, internal gears or external gears, lubricating oil holes and sealing devices, which makes the mainframe design compact, easy to guide and easy to maintain. The slewing bearing is also called the slewing bearing, and some people also call it: the rotary support and the gyro support. Widely used in: truck cranes, railway cranes, port cranes, marine cranes, metallurgical cranes, container cranes, excavators, filling machines, and CT standing wave therapy devices, nautical instruments, radar antenna mounts, missile launchers, tanks , robots, and rotating restaurants.

Different specification and structure of them 

The inner and outer teeth of the slewing ring are directly opened in the inner ring or the outer ring, and are usually processed by a gear hobbing machine or a gear shaping machine. If the working environment load is high, the contact stress is high, and quenching treatment is required.

The overall appearance of the internal gear type is relatively neat, and the gear and the slewing bearing do not need to be equipped with a safety cover, and the gear has better dust resistance. The filling lubricant is kept for a long time, and the internal tooth meshing has a low transmission contact stress, a small amount of wear, and a long service life.

External gears are easy to machine and can make maximum use of the limited space of the slewing ring. If a malfunction occurs, it is easy to make a diagnosis, and the gear meshing check is also easy. Due to the large diameter of the ring gear pitch circle, a larger gear ratio can be obtained, and the circumferential force and torque on the pinion gear are greatly reduced.

Summary

Slewing bearings are widely used in the real industry and are called “machine joints”. Their main applications are widely used in: truck cranes, railway cranes, port cranes, marine cranes, metallurgical cranes, container cranes, excavators. , filling machines, and CT standing wave therapy devices, nautical instruments, radar antenna mounts, missile launchers, tanks, robots, and rotating restaurants. Construction machinery is the most widely used place for slewing bearings, such as earthmoving machinery, excavators, disintegration machines, stacker reclaimers, graders, road rollers, strong boring machines, rock drilling machines, roadheaders, etc. Others include concrete machinery, feeding machinery, lifting machinery, engineering vessels, special vehicles, light industrial machinery, and marine cranes. Of course, the application range of slewing bearings has been gradually expanded, and equipment platforms such as port equipment, metallurgical equipment, and drilling platforms have begun to use slewing bearings instead of original bearings.