Ball Slewing Bearing In Stock

Slewing bearing steel ball size and roller size

When choosing a slewing bearing and a slewing bearing, the first factor is the carrying capacity, the load capacity, or in layman’s terms, the load capacity. The size of the load is determined by the diameter and quantity of the rolling element steel balls or balls. In a word, the larger the rolling element, the more the number, the stronger the bearing capacity. Secondly, point contact has stronger load capacity than line contact.

At the beginning of the design, for the calculation of the load capacity, the diameter of the rolling elements should be estimated first. Generally speaking, four-point contact ball bearings, crossed roller bearings, and three-row roller bearings have the following calculation techniques:

Four-point ball bearing steel ball diameter, assembly height × 0.375, and secondly, hole center diameter – hole diameter – 12 – rotation center diameter, compare the two, and choose the smaller value.

The number of pieces is calculated as, the diameter of the center of rotation × π÷ the diameter of the steel ball = the number of pieces

Double row ball bearing × 2 can be.

Crossed roller bearing hole center diameter-diameter-15-rotation center diameter (30 for 2 meters, 50 for 4 meters)

Three-row roller structure bearing, thicker ring height ÷ 5.2, and then select it in combination with the roller group arrangement.

In the design and selection stage, whether it is a precision slewing bearing, a large ladle slewing bearing in a steel mill, a bucket turbine bearing, a high-speed rotating slewing bearing, or a large crane bearing, a crane slewing bearing, and various working conditions For the slewing ring bearing, the working conditions determine everything.

Heavy-duty precision large bearings are required, and three-row roller structure bearings are generally selected.

It is necessary to control the precision well, and the precision is not easy to lose. Crossed roller bearings are selected because they are in line contact.

High-speed slewing bearing is required, four-point contact ball bearing is selected, and integral cage, PTFE cage, or copper cage or steel cage is used.

Need precise pointing, precise positioning and stop-and-go, vertical installation, inclined installation, ball bearings are preferred.

When installing, pay attention to the direction of the taper pin, the size of the spigot, the lubrication system and the anti-corrosion effect.

Usually, the slewing bearing can have external teeth and internal teeth, and the tooth shape can be helical, half-tooth, or the tooth surface can be quenched, and the tooth surface can be quenched and tempered. Specially stated in the drawing.

Then, the subject of this article, talk about the gear accuracy grade of the slewing bearing and the feasibility, necessity and practicability of gear grinding.

You should know that the reason why the rotary slewing bearing is used as a rotating mechanism is that it is easy to maintain and maintain, and the other is to use the low-speed and heavy-load characteristics of the slewing bearing. Most equipment cannot obtain high precision, high precision, high speed and high load through the slewing bearing. In other words, the slewing bearing itself, as a precision component, is actually a customized product.

Gear accuracy grades are usually indicated by 10/9/8, and 7/6/5 generally require grinding. The grinding process is to achieve precise meshing and precise pointing and positioning. Most do not need to grind the teeth because of the high cost of grinding them.

Regarding the slewing bearing, it is usually said that there are ordinary products and precision products. There are four grades of P0, P6, P5, and P4. The actual custom high-precision slewing bearing is basically higher than the P4. Ordinary bearings and high-precision slewing bearings, from the standard implementation, the slewing ring bearing is JB/T2300, most of which are rough turning and finishing. The slewing bearing is JB/T10471, most of which are CNC finishing and grinding. The technical indicators of precision slewing bearings are clearly decomposed, and are classified into categories from dimensional tolerance, runout, clearance, gear accuracy and the implementation standards of all components.

In terms of application, slewing bearings are basically stupid and bulky mechanical equipment, such as tower cranes, cranes and mixer trucks.

The precision slewing bearing is also relatively demanding equipment life and reliability requirements.