slewing bearing manufacturer made in china

Slewing Bearing

Slewing bearing is a kind of large bearing with special structure that can bear large axial load, radial load and overturning moment and other comprehensive loads at the same time.

Under normal circumstances, the slewing ring bearing itself is equipped with mounting holes, lubricating oil and sealing devices, which can meet the different needs of various types of hosts working under various working conditions; on the other hand, the slewing ring bearing itself has a compact structure and can guide the rotation.

With the characteristics of convenience, easy installation and easy maintenance, it is widely used in large-scale rotary devices such as lifting and transportation machinery, excavators, construction machinery, port machinery, wind power generation, medical equipment, radar and missile launchers.

basic structure

A slewing ring bearing is usually composed of four major components: inner ring, outer ring, rolling elements, and spacer blocks. Because the core component adopts slewing bearing, it can bear axial force and radial force at the same time. There are many forms, but the structure and composition are basically the same.

From left and right are (upper part): 1. Outer ring (with or without teeth) 2. Sealing belt 3. Rolling body (ball or roller) 4. Oil filler

From left and right are (lower part): 1. Plug 2. Taper pin 3. Inner ring (with or without teeth) 4. Spacer block or cage 5. Mounting hole (wire hole or smooth hole)

01 series slewing bearing

The single-row four-point contact ball slewing bearing is composed of four parts: inner ring, outer ring, steel ball and spacer block. radial force. Construction machinery such as rotary conveyor, welding manipulator, small and medium-sized crane and excavator can be selected.

02 series slewing bearing

The double-row ball slewing ring bearing has three races, and the steel balls and spacers can be directly discharged into the upper and lower raceways. According to the stress conditions, two rows of steel balls with different diameters are arranged.

This kind of open assembly is very convenient, and the bearing angle of the upper and lower arc raceways is 90°, which can bear a large axial force and tipping moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed.

The axial and radial dimensions of the double-row reducing ball slewing bearing are relatively large and the structure is tight. It is especially suitable for loading and unloading machinery such as tower cranes and truck cranes that require medium or larger diameters.

Series Slewing Bearings

The single-row cross-roller slewing bearing consists of two races, with compact structure, light weight, high manufacturing precision, small assembly clearance, and high requirements for installation accuracy. Force, tipping moment and larger radial force are widely used in lifting and transportation, construction machinery and military products.

Series Slewing Bearings

Three-row roller slewing bearings have three races with separate upper and lower and radial raceways, so that the load on each row of rollers can be determined exactly. It can bear various loads at the same time, and is the one with the largest bearing capacity among the four products.

The axial and radial dimensions are large and the structure is firm. It is especially suitable for heavy machinery requiring large diameters, such as bucket wheel excavators, wheel Cranes, marine cranes, port cranes, molten steel running table and large tonnage truck cranes and other machinery.

Light Series Slewing Bearings

Lightweight slewing bearing has the same structural form as ordinary slewing bearing, light weight and flexible rotation. Widely used in food machinery, filling machinery, environmental protection machinery and other fields.

HS Series Slewing Bearings

The single-row four-point contact ball slewing bearing is composed of two races, with a compact structure, and the steel ball contacts the arc raceway at four points. Mainly used in truck cranes, tower cranes, excavators, pile drivers, construction vehicles, radar scanning equipment and other machines that are subjected to overturning moment, vertical axial force, and horizontal inclination force.

HJ series slewing bearing

The single-row cross-roller slewing bearing consists of two races, with compact structure, high manufacturing precision, small assembly clearance, and high requirements for installation accuracy. Overturning moment and large radial force are widely used in transportation, construction machinery and military products.

Other series of slewing bearings

■ Single-row four-point contact ball slewing bearings (QU, QW, QN series)

■ Four-point contact slewing bearing (VL series)

■ Four-point contact slewing bearing (VS series)

■ Four-point contact slewing bearing (V series)

■ Single Row Crossed Roller Slewing Bearings (XS Series)

■ Single Row Crossed Roller Slewing Bearings (X Series)

Code composition
Code notation for slewing bearing

The composition of the code

The bearing code consists of the basic code and the rear code.

The composition of the basic code

The basic code is divided into three parts, the front part is the code of the structure type and the transmission type, the middle part is the diameter of the rolling element (for bearings with more than two rows of rolling elements, the maximum rolling element diameter), and the rear part is the diameter of the rolling center of gravity (for two rows of rolling elements) The bearing of the above rolling elements is the diameter of the largest rolling center of gravity)

1. The structural type code shall be in accordance with the rules in Table 1.

01 Four-point contact ball bearing; 02 Double-row reducing ball bearing; 11 Interspersed cylindrical roller bearing; 13 Three-row cylindrical roller bearing.

2. The transmission type code shall be in accordance with the rules in Table 2.

0 toothless type; 1 small module of involute cylindrical gear external teeth; 2 large module of involute cylindrical gear external teeth; 3 small module of involute cylindrical gear internal teeth; 4 involute cylindrical gear The inner teeth have a larger modulus.

3. Basic code compilation rules

When the basic code is arranged, the structure type code and the transmission type code are written consecutively, and the front part, the middle part and the rear part are separated by .

Folding Tolerance Clearance
The tolerances and clearances of the slewing bearings conform to JB/T 10471 “Rolling Bearings – Slewing Bearings”, and the tolerances and clearances of the slewing bearings for wind turbines conform to JB/T 10705 “Rolling Bearings – Wind Turbine Bearings”.

If the customer has other special requirements for size, tolerance and clearance, the corresponding products can be provided according to the operating conditions and user requirements.

folding cage
The cage types used in slewing bearings have different structural types such as integral cage type, segmented cage or isolated cage. The integral cage or segmented cage is made of 20-gauge steel or ZL102 cast aluminum alloy. The isolation cage is made of polyamide 1010 resin, ZL102 cast aluminum alloy or QA110-3-1.5 aluminum bronze. With the continuous development of the material industry, nylon GRPA66.25 has also been popularized and applied in the design of segmented cages.

Applied Materials
Materials for rings and rolling elements

Under normal circumstances, the rolling elements of the slewing bearing are made of carbon-chromium bearing steel which is hardened as a whole. The grade is made of GCr15 or GCr15SiMn steel; the slewing bearing ring is made of surface hardened steel. When the user has no special requirements, it is generally made of 50Mn steel, but sometimes in order to meet the needs of the host in some special applications The specific conditions of use select other grades of surface hardened steel, such as 42CrMo, 5CrMnMo and so on.

material for cage

Cages for slewing bearings have integral, segmented, spacer block and other structural forms. The integral and segmented cages are made of 20-gauge steel or ZL102 cast aluminum alloy. The spacer block type is made of polyamide 1010 resin, ZL102 cast aluminum alloy, etc.

material for sealing ring

The material used for the sealing ring of the slewing bearing is made of oil-resistant rubber or nitrile rubber.

The codes of the ferrule material and the supply status of the blank are as specified in the table. In the table, “T” means that the blank of the ring is supplied in a quenched and tempered state, and “Z” means that the blank of the ring is supplied in a normalized state.

code

01

02

03

04

05

06

Material and blank state

45BT

45BZ

42CrMoT

42CrMoZ

5CrMnMoT

5CrMnMoZ

code

07

08

09

10

11

12

Material and blank state

42SiMnT

42SiMnZ

45MnT

45MnZ

50MnT

50MnZ

The diameter of the center circle of the rolling element is 3150mm, the diameter of the ball is 75mm, the gear modulus is m=20mm, the ring material is 50Mn, and the blank material is the normalized state.