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250.15.0475.013 ring bearing

UWE 250.15.0475.013 ring bearing is a kind of single row four point contact ball slewing bearing without tooth which is composed of two seat rings,which design in compact structure and light weight, steel ball contact with the circular raceway at four points; it can bear the axial force, radial force and the tilting moment at the same time. UWE Single-row four point contact ball ring has the features of compact in design, and light in weight. The balls roll on the circular race at four points, so it can undertake the axial force, radial force and tipping moment at the same time. This series of four point contact ball bearings are suitable in many engineering machinery, such as rotary conveyor welding operation machine, small cranes, small and medium-sized excavators,slewing conveyer, welding manipulator, light and medium duty crane, and other construction machinery.

For details,please contact jennny.zhang.bearing@gmail.com

250.15.0400.013 trailer bearing/truck turntable

UWE 250.15.0400.013 trailer bearing/truck turntable bearing is a kind of single row four point contact ball slewing bearing without tooth which is composed of two seat rings,which design in compact structure and light weight, steel ball contact with the circular raceway at four points; it can bear the axial force, radial force and the tilting moment at the same time. UWE Single-row four point contact ball ring has the features of compact in design, and light in weight. The balls roll on the circular race at four points, so it can undertake the axial force, radial force and tipping moment at the same time. This series of four point contact ball bearings are suitable in many engineering machinery, such as rotary conveyor welding operation machine, small cranes, small and medium-sized excavators,slewing conveyer, welding manipulator, light and medium duty crane, and other construction machinery.

For details,please contact jennny.zhang.bearing@gmail.com

250.15.0375.013 UWE turntable bearing

UWE turntable bearing 250.15.0375.013 is a kind of single row four point contact ball slewing bearing without tooth which is composed of two seat rings,which design in compact structure and light weight, steel ball contact with the circular raceway at four points; it can bear the axial force, radial force and the tilting moment at the same time. UWE Single-row four point contact ball ring has the features of compact in design, and light in weight. The balls roll on the circular race at four points, so it can undertake the axial force, radial force and tipping moment at the same time. This series of four point contact ball bearings are suitable in many engineering machinery, such as rotary conveyor welding operation machine, small cranes, small and medium-sized excavators,slewing conveyer, welding manipulator, light and medium duty crane, and other construction machinery.

For details,please contact jennny.zhang.bearing@gmail.com

250.15.0300.013 UWE slew ring/turntable bearing

WE turntable bearing 250.15.0300.013  is a kind of single row four point contact ball slewing bearing without tooth which is composed of two seat rings,which design in compact structure and light weight, steel ball contact with the circular raceway at four points; it can bear the axial force, radial force and the tilting moment at the same time. UWE Single-row four point contact ball ring has the features of compact in design, and light in weight. The balls roll on the circular race at four points, so it can undertake the axial force, radial force and tipping moment at the same time. This series of four point contact ball bearings are suitable in many engineering machinery, such as rotary conveyor welding operation machine, small cranes, small and medium-sized excavators,slewing conveyer, welding manipulator, light and medium duty crane, and other construction machinery.

For details,please contact jennny.zhang.bearing@gmail.com

slewing bearing 250.14.0400.013

UWE slewing bearing 250.14.0400.013  is a kind of single row four point contact ball slewing bearing without tooth which is composed of two seat rings,which design in compact structure and light weight, steel ball contact with the circular raceway at four points; it can bear the axial force, radial force and the tilting moment at the same time. UWE Single-row four point contact ball ring has the features of compact in design, and light in weight. The balls roll on the circular race at four points, so it can undertake the axial force, radial force and tipping moment at the same time. This series of four point contact ball bearings are suitable in many engineering machinery, such as rotary conveyor welding operation machine, small cranes, small and medium-sized excavators,slewing conveyer, welding manipulator, light and medium duty crane, and other construction machinery.

For details,please contact jennny.zhang.bearing@gmail.com

UWE slewing bearing/ slewing ring 250.14.0300.013

UWE slewing bearing 250.14.0300.013 is a kind of single row four point contact ball slewing bearing without tooth which is composed of two seat rings,which design in compact structure and light weight, steel ball contact with the circular raceway at four points; it can bear the axial force, radial force and the tilting moment at the same time. UWE Single-row four point contact ball ring has the features of compact in design, and light in weight. The balls roll on the circular race at four points, so it can undertake the axial force, radial force and tipping moment at the same time. This series of four point contact ball bearings are suitable in many engineering machinery, such as rotary conveyor welding operation machine, small cranes, small and medium-sized excavators,slewing conveyer, welding manipulator, light and medium duty crane, and other construction machinery.

Yaw Ring For Wind Turbine

The yaw ring is the crucial part in the yaw system of the wind turbines, and its function is equivalent to the large sliding bearing.. It is located at the bottom of the nacelle seat, connected with tower by bolts, supporting nacelle by means of the sliding surface, and it is meshed with four sets of yawing reducer, driven by a yaw motor to the nacelle to get overall slow rotation.The typical design life of yaw gear rings is 20 years, due to the special installation position/maintenance difficulty and high cost of replacement, higher requirements and manufacturing accuracy is needed.UWE yaw ring is a large ring gear, the material is QT alloy steel; according to the requirements of yaw ring,the module is generally between 10 ~ 20 and tooth surface requires hardening, the hardness of the general requirements is above 50HRC.

UWE general manager was interviewed by CBN

UWE bearing attended the Hannover Mess 2015 from April 13 to April 17.
During the exhibition, UWE bearing general manager Mr. Xie was interviewed by China Business News mentioning that   "Most of UWE customers are domestic market, we hope that we could learn new and advanced technology by attending this exhibition, on the one hand we are aim to develop overseas market." 
Hannoer Mess offered great chance for Chinese companies to open eyesight,learn technology and get communications.
During the messe, UWE got nearly 150 foreign customers coming to see our slewing bearings, and they showed great interests in UWE bearings, especially for the zinc coating and painting. The exhibition offered great paltform for both supplier and customers.
UWE also will keep attending and learning for bright future.

Wind Power Hits Record High In China’s Coal Hub

Following a continuous surge in capacity levels over the past half decade, the northern Chinese coal hub of Shanxi province posted a record level of wind power generation in the second half of January.

china wind turbinesAccording to official data, wind power comprised a total of 14% of electricity generation in Shanxi province on January 18, 2015, with the full day wind power generation amount reaching 69.26 gigawatt-hours in total.

On the same day, the contribution made by wind power to the grid in Shanxi province reached a record-breaking high of 3.698 gigawatts at 12:24 in the afternoon.

As of the end of last year, Shanxi province’s installed wind power capacity had reached a total of 4.85 gigawatts, making it the second-largest electricity source within the province.

In 2014, the full year wind power generation amount was 7.524 terawatt-hours, while the average annual usage time for wind power modules was 1912.1 hours.

Shanxi’s increasing usage of wind power and other sources of renewable energy is particularly noteworthy given its status as one of China’s most polluted provinces, chiefly as a result of the prominence of the local coal mining industry and its importance to the country’s overall energy supply.

The province’s urban centres are notorious for the severity of their air pollution, with Linfen frequently cited by World Bank assessments of air quality as the most polluted city on the planet.

In addition to expanding installed wind power capacity, Shanxi province is also striving to deal with the problem of intermittent generation and increase usage efficiency, via the development of a province-wide automated control system based on forecasts of air patterns.

The system is expected by the local government to achieve an increase in wind power absorption by the grid of as much as 23%.

Wind power isn’t Shanxi’s sole source of renewable energy. As of the end of last year, Shanxi’s installed solar power capacity was 405 MW, while in 2014 its solar power generation amount reached 315.1 gigawatt-hours, with an average generation time of 1518.4 hours.

Renewable energy currently accounts for roughly 9% of province-wide installed power capacity.

support for wind energy solutions

UWE manufactured new slewing bearings used for small wind turbines with the rolling central diameter 802mm and 422mm. UWE is engaged in all wind energy solutions to everyone.

英文版

Wire-race bearings application

Stratosphere observatory for infrared astronomy.
An aluminum three-row wire-race roller bearing with a bolted steel gear ring for the rough adjustment of the telescope was applied. The telescope is in the rear of a converted Boeing 747.During the flight, a sort of “sliding roof” opens to enable the telescope to make astronomic observations in the infrared range.
Optical telescopes
Three-row wire-race roller bearing was designed for telescopes. The bearing rings are made of aluminium.The bearings enable the adjustment of the M2 mirror.In addition,a surface-hardened three-row precision bearing was supplied to adjust the M3 mirror.Astronomic faculties use these telescopes for their extensive research.
Articulated buses
Hybrid-type four-point bearing was manufactured for the articulation of buses, consisting of a wire race bearing part and a surface-hardened part.The majority of the articulated buses are referred to as pushers, i.e. the engine and entire drive unit are located in the rear section, in the trailer.This concept puts a lot of specific requirements on the articulation, such as buckling stability, for instance, which is achieved by means of a complicated electronically-controlled damping system.

UWE Wire-race Bearing Components

Wire races:Hardened or naturally hardened steels
Rolling elements:Bearing steel, also corrosion-resistant
Bearing rings:aluminium
Surface: corrosion-proof
• Steel normalized or hardened and tempered
Surface: corrosion-proof
• Stainless steel, selection as required(e.g. acid-resistant steels)
• Special steels, selection as required(e.g. magnetoresistive steels)
• Bronze(e.g. seawater-resistant bronze)
Rolling elements
• Bearing steel, also corrosion-resistant
Gear rings
• The material can be selected as for the bearing rings.
• The gearing cut into the ring can be hardened.
Material combinations
• Material combinations in one bearing are also possible (e.g. rings of aluminium and gear ring of hardened and tempered steel).
Design and dimensioning

Wire-race bearing special designs

There are few special types for UWE wire-race bearing
Four-row wire-race roller bearing
Particularly designed to transmit loads due to the different expansion behaviour of the outer and inner companion structure or to prevent radial clearance in this context.
Hybrid-type three-row wire-race roller bearing
The raceways of the outer ring are surface hardened, the raceways of the inner rings have a wire filling. Particularly designed to compensate raceway tilts due to the expansion of the inner companion structure.
Hybrid-type four-point wire-race ball bearing
The raceways of the inner ring are surface hardened, the raceways of the outer ring have a wire filling. Particularly designed to enable the necessary cast design to act at the same time as outer ring.
Four-point wire-race ball bearing
With integrated 4-way slip ring and retaining ring with spring suspension system. Particularly designed for the transmission of electric current and limitation of the frictional torque in case of a major deformation of the companion structure. Furthermore equipped with earthing plugs to compensate the potential between the bearing rings.
Three-wire race bearing
With integrated ring motor. Particularly designed to integrate the drive into the bearing.
Segmented wire-race ball bearing
Particularly designed for limited available space.

ship crane slewing ring

Key Specifications/Special Features of UWE ship slewing rings:
Inner diameter: 600- 4500 mm
Outer diameter: 700 - 5000 mm
Width: 56-300mm
Tooth processing module:M7-M25
Gear machining accuracy:<0.1
Max. Tapping diameter:M60
Gear optition: extenal gears,internal gears,no gears 
Rolling element: ball or rollers
Rolling element material: Chrome steel GCr15 or GCr15SiMn
Ring Material: 42CrMo, 50Mn, steel 45#
Seal: NBR
Normalizing hardness: 187HB-241HB
Quench & temper hardness: 229HB-269HB
Raceway hardness after quenching: 55HRC-62HRC
Sevice:OEM Service Offered/Design Service Offered/Buyer Label Offered

UWE ship crane slewing ring includes double row ball slewing ring, four-point contact ball slewing ring and three row roller slewing ring.Large size three row roller slewing ring is often selected for heavy duty deck crane, four-point contact ball or double row ball slewing ring are often selected for light duty deck cranes.Large shipboard crane with a three row roller slewing ring. The high load capacity and compact proportions of this type of slewing ring are ideally matched to the mast and base block proportions of the crane.Deep sea fishing vessels use ball slewing rings for shipboard cranes and net handling equipment.
UWE slewing rings are widely used in kinds of cranes, such as tower cranes, ship deck cranes, mobile cranes, railway cranes and so on.

Yaw and Pitch Rolling Bearing Design Types

Modern wind turbines use large slewing rings at the root of each blade to enable pitch angle changes and thus aerodynamic performance and load control. Yaw bearings are used for angular realignment of the nacelle into the predominant wind direction. These applications require long periods in nearly stationary positions with large stochastic loads. Due to this demanding load environment and the fact that bearings exist in the critical load path, their design becomes critical to the safety and reliability of most turbine designs.
Large wind turbines (those rated at more than 250 kW) use ball or roller bearings with special configurations for blade retention pitch bearing and yaw bearing locations. The bearings consist of two ring-rolled forgings forming the outer and inner raceways and a complement of either balls or rollers. The inner and outer continuous-ring forgings have mounting holes that allow the bearing to be bolted directly to the supporting structures. The balls or rollers are inserted into the bearing through a radial cylindrical hole in one of the rings. The hole then is closed using a removable loading plug con-toured to the ball path or roller path surface. 
It is common practice to cut a spur gear integral with one of the bearing rings, especially for the yaw bearing application. Individual plastic spacers or thin section cage arc segments are used to separate the balls. The spacers are cylindrical with a hemispherical end. The individual rollers in the cross-roller bearing are separated by plastic, saddle-shaped spacers. The rollers in the cross-roller bearing alternate in their orientation to carry load.
The inner and outer rings are hardened from 250 to 300 Brinell hardness (HB). This is referred to as the “core hardness” of the ring. This core hardness should provide adequate core yield and fatigue strength, yet remain at a hardness low enough to facilitate machining of the rings, gear teeth, and mounting-bolt holes. The actual ball or roller path (rolling contact surface) is induction heated, quenched, and tempered to provide a hard surface or “case.” The surface hardness of the raceway is a minimum of 58 HRC (Rockwell C scale hardness). The depth of the hardened case is defined as the depth to a hardness of 50 HRC.
The two-row, eight-point contact ball bearing type is more costly to manufacture than the single-row, four-point contact ball bearing. In addition to having a second row of balls and separators, the two-row bearing must be repeatedly assembled and disassembled during manufacture to accurately measure and match the internal diametral clearance or preload of the two ball rows.
The main advantages of the eight-point contact ball bearing, as compared to the four-point contact ball bearing, are:
• Lower ball loads;
• Lower Hertz stresses;
• Less required case depth; and
• Increased fatigue life.

Bearing Design Criteria-wind turbine slewing ring

The proper design of a yaw or pitch bearing must satisfy five design criteria and the miscellaneous considerations listed below. Each of the following criterion is addressed in detail in this guide.
1. Bearing fatigue life (rolling contact fatigue)
2. Bearing static capacity
3. Adequate case depth and core hardness
4. Adequate lubrication (surface failure)
5. Friction torque
6. Miscellaneous
A. External bolting
B. Cages or separators
C. Integral seals
The relationships used in the method for determining the basic dynamic capacity in oscillation, life adjustment factors, and equivalent load are supplied in Section 4.

Effective Lubrication for Wind Power Bearing

A meaningful oil film thickness cannot be generated in a slowly and intermittently moving (oscillating) grease-lubricated yaw or pitch bearing. Therefore a clean grease with good boundary lubrication additives (especially for oscillating conditions) should be selected on the basis of experience for use in wind turbine yaw and pitch bearings. A seal system (integral or external) also is essential for achieving satisfactory operation.
A fretting-corrosion type of raceway and rolling element surface failure commonly is encountered in yaw and pitch bearings. The fretting corrosion appears as elliptical or rectangular footprints at ball or roller spacing in the bearing. The markings are tiny corrosion pits caused by the lubricant being forced out of the contact area (by a small load increase) and then not being able to re-enter the contact zone. The unprotected surface then is subject to corrosion pitting. Most grease rated for oscillation use can coat the rolling contact surfaces and maintain corrosion protection. In extreme cases, coating the raceways is an option. A TDC coating increases the bearing cost significantly but provides increased protection.
One manufacturer of wind turbine yaw and pitch bearings suggests using the Hertz contact stress limits given in Table 16 as means to limit fretting-corrosion types of failures.

Wind Power Generator Slewing Ring Cages or Separators

Most yaw and pitch bearings are supplied with plastic spacers between each rolling element. A four-point contact ball bearing has cylindrical spacers with hemispherical indented ends. The cross roller bearing has plastic saddle-type spacers, which conform to the two adjacent rollers with axes of rotation 90 degrees apart. The ball spacers for larger balls (50-mm diameter and larger) often have a steel-plate reinforcement cast into the plastic.
Use of segmented cages is very rare for yaw and pitch bearings. The opening that the cage requires between the raceways significantly reduces the available load-carrying ball path. The bearing manufacturer should be consulted about spacer design. The spacer material also must be compatible with the selected lubricant.