Slewing Ring
We produce single-row ball, two-row ball,cross-rolling pole, three-row pole altogether 8 series,more than 2000 specifications of slewing rings. The executing standards of our products are JG/T66-1999,JG/T67-1999,JG/T68-1999 and JB/T2300-1999. We can also map and design the non-standarded seals according to the requirements of our customers.
   Slewing Ring Principle   ( back to top )

single-row ball slewing ring
three-row pole slewing ring
cross-rolling poleslewing ring
two-row ball slewing ring

       1. Selection of frame type

        Common slewing ring classifies into four types: single-row ball, two-row ball,cross-rolling pole, three-row pole

        According to our experience and calculation, we have conclusion as follows:

  • Bearing capacity of single-row ball slewing is more than cross-row pole with same figure dimension.
  • Below 160 ton meters load of incline moment, adopts single-row ball slewing bearing can get higher quality & price rate than threw-row pole slewing bearing,that is principal selection.While when incline moment is longer than 160 tons meters, should consider three row pole slewing bearing.

        2.Selection of single-row slewing bearing series

        Domestically, at present single-row slewing bearing has specifications of 3 series:HS series and 01 series.
     
        New clients usually don’t know how to choose, we think each series has its own adantage, we analyze as bellows:


        Types and specifications of our Slewing Rings

 Types

The Max.Dia.
of raceway 

The Max.Dia.
of Rolling Part 

The max
Module of Gear 

 singe row ball Slewing Rings

5000mm 

80mm

32mm

 Single-row Crossed Roller Slewing Rings

2500mm

60mm

25mm

 Dual Row Ball Slewing Rings

4500mm 

60mm

25mm

 Double-row Four-point slewing Rings

5000mm

60mm

 32mm

 Tri-row Roller Slewing Rings

5000mm

60mm

 40mm

  Compare parameter of three series( take outer tooth with roll center diamter of 1250 as example)

series

weight Kg

steel ball diameter mm

center diameter of roll path mm

roll path capacity N

Install bolt hole

QW1250*40

388

40

1250

3696800

32-ø26

011*35*1250

420

35

1250

3291100

40-ø26

HSW1250*40

490

40

1250

3696800

36-ø22

a.HS series single-row slewing bearing is the continue of the history. Before eighty of the last centenary, national main type is cross-roll pole, , it was gradually instead by slewing bearing. In order to avoid mainframe’s measurement being influenced, we design HS series single-row slewing bearing with outer figure same as former cross-row pole but inner construction changes to single-row type. It is characterized by large dimension, for example: weight of HSN1250.40 is 470Kg,while QNA 1250.40 with same carrying capacity is 388Kg, so HS series cost more resource and the production cost of making HS series is 10% more than Q series with same carrying capacity, and also not as good as some products abroad. Hence, to save cost and resource, should avoid use HS series. Considering change slewing bearing would change mainframe’s relative measurement also, new design shouldn’t use HS series anymore. b.01 series single-row slewing bearing is slewing bearing series which bases on axletree recommended by former Mechanical Ministry in 1984.Number of its install bolt hole are much , fair, but rolling path parameter resists unfair matching, take 011.45.1400 and 011.35.1400 slewing bearing as example, its outer dimension is as same as its installing dimension, and production cost is same too, but 011.45.1400 uses steel ball with diameter of 45mm, while 011.23.1400 uses stell ball with diameter of 35mm, hence the latter’s carrying capacity reduces 22%.So when use 01 series single-row bearing, should select bigger steel ball. c.Q series single-row slewing bearing is referenced on 01 series slewing bearing’s parameter by Construction Ministry in 1986, its section size is more close with lighter weight and fine price & price rate.

   Slewing Ring Method No.   ( back to top )

《JG/T66-1999》Numbering of slewing bearing

1.
 No teeth slewing bearing consists of outside gear inner ring and inside gear outer ring with the same ball track center diameter.The plug and oil-hole is located on the outer ring.

2.  The ball track center diameter size series of crossed roller slewing bearing is exactly the same as single-row ball slewing bearing . The roller diameter of crossed roller slewing bearing and single-row ball slewing bearing is different. Refer to the following.

Ball dia. Of Q type

20

25

32

40

50

60

Roller dia. Of J type

14

18

22

28

36

45

   Slewing Ring Calculation   ( back to top )
Calculation of Type-choosing of Slewing Ring
 

Single-row ball slewing ring

1.Calculating the rated dead content

Co = f ·D·d

Co-----the rated dead content, N
f ------dead content coefficient,110N/mm2
D -------rollgang central diameter ,mm
d ------- steel-ball nominal diameter,mm
2. Calculating the equivalent axial load based on the assembled outer load

Cp = P + 4370 M/D + 3.44 Fr

  Formula:Cp ——equivalent axial load ,N
M ——total capsizal moment,N·m
P ——total axial force ,N
Fr——total radial force,N Three-row pole slewing ring
3. Calculating safety factors

fs = Co / Cp

Formular:values of fs can be selected from the following table

Three-row pole slewing ring

1.Calculating the rated dead content

Co = f ·D·d

Formula:
Co-----the rated dead content, N
f ------dead content coefficient,147N/mm2
D -------rollgang central diameter ,mm
d ------- upper-row pole diameter,mm
2. Calculating the equivalent axial load based on the assembled outer load
 

Cp = P + 4500 M/D

Formula:
Cp-------equivalent axial load ,N
M--------total capsizal moment,N·m
P---------total axial force ,N
  
3. Calculating safety factors

fs = Co / Cp

Formular:values of fs can be selected from the following table


Table1 Safety Factors of Slewing Ring
Working Types Working Features Related Machinery fs
Light-duty not always in full load,balanced slewing and small impact autolifts,reclaimers,non-port wheel cranes 1.00~1.25
Medium not always in full load,quicker slewing and with impact tower cranes,ship cranes, track cranes 1.20~1.35
Heavy-duty always in full load,quick slewing and strong impact single grabbing excavators,grabbing cranes,port cranes,container cranes 1.30~1.60

Extra-heavy

always in full load,strong impact and unfavourable working conditions reclaiming bucket excavators,tunneling dibbles,metallurgical cranes,marine operation platform cranes 1.60~2.00


   Slewing Ring Use&Range   ( back to top )

Rotary is all the support needed between the two parts relative to bear the axial rotation and at the same time, and radial force and overturning moment of the machinery-based components. Its basic function is to be fixed bolts used in machinery and equipment of the upper and lower bearings, and a power-transmission, and machinery and equipment between the two parts of the relative rotation. Slewing bearings are generally installed with a hole in gear, or gear, lubrication and seal holes, a compact, light weight, structural steel and good, smooth operation and high precision, secure, reliable and so on.

Slewing bearings and bearing the same, with both rolling and rolling of the Ring Road, but it compared with the general Rolling, there are many differences, there are the following:

① rotary bearing the larger size, its diameter is usually in the 0.4-10 meters, and some as large as 40 meters in diameter.
② slewing bearings in general should bear several aspects of the load, not only have to bear axial force, the radial force, but also bear the larger overturning moment. Therefore, often supported from a rotating sets of ordinary Rolling role.
③ rotary bearing the functioning of the lower rate, usually 50 to / minutes. On many occasions, the rotary bearing no continuous operation, but only from the perspective of the rotation, or the so-called swing bearings.
④ in materials and manufacturing processes, such as heat treatment, slewing bearings and roller bearing a great difference.
⑤ Usually, slewing bearings on the drive with a rotation of the ring gear and dust with the seal.
⑥ installed in different ways, unlike ordinary slewing ring bearing in mind that sets installed in the shaft and bearing boxes, but will be fixed by screws in the upper and lower bearings on.

Rotary is supporting the basic machinery and equipment parts, the national economy in various sectors of the application of a very wide range, the products are widely used in engineering machinery, port machinery, metallurgical machinery, mining machinery, oil machinery, chemical machinery, medical equipment, shipbuilding, machinery, Light industrial machinery, environmental protection machinery, entertainment equipment, transport machinery and military equipment and other industries. Rotary is now supporting the increasing use of the energy conservation and environmental protection projects, such as wind turbine needs of a variety of sophisticated slewing bearings supporting.
Radius of the production companies, including single-volleyball, cross-roller, three rows column, dual-volleyball, double row ball, two-Rotary, the Yaogu-Kazakh Ceftiofur-eight categories were more than 1,500 kinds of specifications in support of the Rotary In the areas within the extensive use of.

Applications range

Company products are mainly for excavators, tower cranes, cars cranes and crawler cranes matching, also used in other construction machinery, engineering machinery, and port machinery, metallurgical machinery, and light industrial machinery, and other fields, over the years for the domestic construction machinery and The main construction machinery manufacturer Xugong, Yuchai, Sanyichonggong, in the re-Branch, Liugong, Ha workers, such as built-choice, and bulk exports to the United States, Canada, Japan, Italy, Southeast Asia, the Middle East and other countries and Region.

Rotary is all the support needed between the two relatively Rotary also bear axial force at the same time, radial force and overturning moment of the mass of the mechanical components. In addition to building machinery and construction machinery supporting, but also widely used in port machinery, metallurgical machinery, light industrial machinery, wind power and military equipment, etc.

 Excavators

Tower crane 

Truck Crane  

 

   Slewing Ring   ( back to top )

The Main Types and Specifications of Slewing Ring


Types of Slewing Ring The Max. Dia of Raceway The Max. Dia of Rolling Part The Max. Module of Gear
Single-row Ball Slewing Ring 5000mm 80mm 32mm
Dual-row Ball Slewing Ring 4500mm 60mm 25mm
Single-row Cross-roller Slewing Ring 2500mm 60mm 25mm
Tri-row Roller Slewing Ring 5000mm 60mm 40mm
Double-row Four-point Slewing Ring As per customers demands.
Dual Slewing Ring
Convex-roller Slewing Ring
Half-type Slewing Ring



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