Slewing Gear Ring Bearing Drive

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Slewing Gear Ring Bearing & Slewing Gear  Drive

Rotary gears are usually divided into two types, one is the rotary gear support bearing, the other is the rotary gear drive
Slewing gear support bearings are composed of an inner ring and an outer ring, usually one of which contains the gear. Together with the connecting holes on the two rings, they are easily and quickly wired through the adjacent link components for optimized power transmission. Slewing gear bearing raceways combined with rolling elements and cages are designed to withstand loads acting individually or in combination in any direction.
Rotary gears can be used in various industries such as aerospace, heavy equipment, industrial machinery, medical systems, mining, oil and gas, etc., and are the key to many industries and play a vital role.
The slewing gear support bearing is different from ordinary bearings, the difference is that it has a gear that can adjust the rotation. The machine transmits and adjusts the direction of the mechanical products fixed on the slewing bearing through the dynamic sensing system installed on the slewing gear bearing. and take advantage of special constructs:

It maintains the overall balance, effectively guarantees the radial force generated in the work, and ensures the balance.

The rotary gear drive is a kind of turntable fixed in the gear box, which can safely bear the radial and axial load force, and drives the rotation of the turntable through the rotation of the turbine. Rotary gear drive is a gearbox composed of gears, bearings, seals, casings and motors.
The rotary gear drive is a modification of the worm drive mechanism. It dates back to the Renaissance period, when the Greek mathematician Pappus devised a worm drive. Da Vinci also used the slewing gear drive trim in many of its machines.


The driving force of the rotary gear drive comes from the rotational force given by the motor to the worm, and the gear on the worm is adjusted by the gear on the electric turntable. This combination mode reduces the rotation speed of the turntable, increases the torque, and can drive heavier objects.
Slewing gear drives can be applied to solar trackers, wind turbines, elevators, hydraulic machinery, telescopic arms, cranes and other equipment.

Slewing Bearing Processing Manufacturer

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Slewing bearing rolling element

The rolling elements of the slewing ring are made of anti-friction bearing steel. Such materials will be produced according to the company’s standard regulations, and through strict chemical composition analysis of the materials, relevant reports will be printed out. In order to ensure the same quality, the production standard batches will be strictly monitored during the licensing process. LDB slewing bearing rolling body is regularly audited and inspected to ensure the high quality pass rate of the product.

Slewing Ring Washer/Cage

The gaskets and cages of the slewing bearing are mostly made of polyamide. Such a cage can maintain the equidistant rotation of each rolling element during the rotation of the rolling elements, preventing the rolling elements from running safely and reliably. Polyamide gasket cages produced by LDB slewing bearings are of consistently high quality. In certain bearings, metal spacers and cages are also used.

Slewing ring raceway

For the slewing bearing raceway of rolling elements, LDB relies on precise machining and unique engineering principles to keep the rolling elements stable in motion.

Manufacturing process of LDB slewing bearing raceway – car pin

The runway after turning is quenched on a re-quenching machine to increase the hardness of the runway, and the slewing bearing runway after quenching is polished to a certain smoothness.

Slewing Ring Seals

When designing the raceway system of LDB’s large slewing bearing, lip seal kits are designed on both the upper and lower sides. These seals have two main functions: 1. Prevent dust, moisture and other particles from entering the bearing and cause wear and damage; 2. The seals separate the raceway and the bearing ring.

Slewing ring seals are available in a variety of materials and types. The type and material of the seal depends on the shape of the bearing and the surrounding service environment. The slewing bearing of mechanical engineering adopts a simple lip design, which has a better sealing effect. In special circumstances, however, different groove designs are used. The slewing bearing working in a particle-rich environment, with a simple design, is ineffective, and it is easy for grease to flow out of the seal, affecting the slewing bearing operation, and there will be a certain degree of wear. For example, working in ultraviolet and high oxygen content environments will be affected. Therefore, the seals of LDB slewing bearings will be made of different materials according to customer needs, and it is recommended to use specially designed seals, and during the installation process, the seals should be filled with grease.

Slewing Bearing Gear Drive

LDB slewing bearings can have two types of internal gears and external gears, both of which are spur gear operation modes. As well as special gear structures, helical gears and turbine gears, toothless slewing bearings can also be produced according to customer requirements.

Gear hardening

For the most part, the teeth are in their natural state, as are the rings themselves. The strength characteristics of the gear teeth are the strength characteristics of the base metal. If the application requires additional strength and wear resistance, the gear teeth are induction hardened. Hardening of the teeth will increase the wear and strength properties to the desired level. Depending on the pitch diameter and module of the gear, the teeth are induction hardened or rotationally hardened. To avoid metallurgical gaps with unhardened material in the transition zone, the teeth are hardened primarily at the root of each tooth. In addition to improving the load-carrying capacity of the tooth surface, it also increases the strength at the tooth root. Tooth spacing hardened hardened microsections.

Bearing Ring

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A bearing ring is an annular part of a radial rolling bearing with one or several raceways.

Bearing rings are divided into: bearing inner ring, bearing ring with raceway on the outer surface; bearing outer ring, bearing ring on the inner surface of the raceway; tapered inner ring, inner ring of tapered roller bearings; tapered outer ring, tapered outer ring outer ring of roller bearings; double raceway tapered inner ring, double raceway tapered roller bearing inner ring; double raceway tapered outer ring, double raceway tapered roller bearing outer ring; wide inner ring, in A bearing inner ring widened at one or both ends to improve the guidance of the shaft in its bore or to provide additional locations for mounting fasteners or seals; a keyed inner ring, a grooved ball bearing inner ring with all or part of the shoulder removed ; Locked outer ring, a grooved ball bearing outer ring with all or part of the shoulder removed; Stamped outer ring, stamped from a thin sheet metal, sealed at one end (sealed stamped outer ring) or open at both ends, generally directed toward the center roll Outer ring of needle bearings; flanged outer ring, bearing outer ring with flanges; self-aligning outer ring, outer ring with spherical outer surface to accommodate permanent angular displacement between its axis line and the bearing seat axis line ; Self-aligning outer race, used for aligning the ring between the outer ring and the seat hole, has a spherical inner surface that matches the spherical outer surface of the outer ring; outer spherical surface, the outer surface of the bearing outer ring is a part of the spherical surface; The front rib of the conical outer ring, the rib on the front of the raceway of the conical outer ring, is used to guide the roller and bear the thrust of the large end face of the roller; the middle retaining ring, the bearing ring with double raceway, such as the double raceway cone The middle integral rib of the inner ring.

Production steps of bearing rings

  1. Bearing ring forging: If over-burning, overheating, and internal cracking into reticulated carbides occur during the forging process, the toughness and strength of the ring will be reduced. Therefore, it is necessary to strictly control the processing temperature, cyclic heating and post-forging heat dissipation conditions (such as spray cooling), etc., especially after the final forging of larger varieties of ferrules, the temperature is above 700 ℃, and they should not be stacked and placed.
  2. Heat treatment of bearing rings: Close monitoring of heat treatment equipment is an important work in the workshop. Monitoring equipment reliability. Important temperature control equipment such as instruments and thermocouples must be closely monitored to ensure accurate and reliable measurement data; those with errors exceeding the standard should be replaced in time, and it is strictly forbidden to operate with illness.
  3. Monitoring of bearing ring grinding process. The finished imported bearing rings are not allowed to have grinding burns and grinding cracks, especially the matching surface of the inner ring screwdriver must not have burns. If the ferrules are pickled, they should be fully inspected, and the burnt products should be removed. Those with severe burns that cannot be repaired or those that fail to be repaired should be scrapped. The ferrules with grinding burns are not allowed to enter the assembly process.
  4. Bearing ring identification management, after the steel is put into storage and before the ring grinding, each process must be strictly managed, and strictly distinguish between GCR15 and GCR15SIMN two different materials and products.

Depending on the application and purpose of the LDB large diameter bearing, different materials are used for the bearing rings. These standards are made of tempered alloy steel and are specified by our own company standard (LN), derived from DIN EN 10083-1. For applications requiring additional properties, special materials such as chrome-nickel steel for low temperature environments are used.

The chemical composition, the handling of the material during the formation of the raw material and the mechanical properties of the base material are specified in the company standards. To ensure consistent quality, each raw material is monitored during manufacturing according to the testing criteria defined in the LDB standard.

Regular audits of suppliers ensure compliance with delivery specifications.

Various certificates are available for raw materials according to DIN EN 10204, as required by the scope of testing and documentation.

On request, provide all documentation required for component or system certification or classification.

Large Diameter Slewing Bearings

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LDB high quality large diameter slewing bearing

The high-quality large-diameter slewing bearing produced by LDB leads the world, and has more than 20 years of experience in the design, development and customization of large-diameter ball bearings. LDB’s high-quality service has won unanimous praise from customers.

LDB oversized bearing combination

The range of oversized bearings currently produced by LDB includes large diameter slewing ring bearings, single row bearings, double row four point bearings, triple row ball bearings, and also offers a variety of custom designed special bearings.

The slewing ring bearings produced by LDB include external, internal and gearless bearings. Among them, the bearing with gear needs to be determined according to the actual situation.

Multifunctional application of LDB large slewing ring bearing

The large diameter bearings produced by LDB are used in various fields, and different designs meet different needs. This includes construction machinery such as excavators and drilling rigs, as well as mining, construction and offshore wind turbines.

LDB one-stop bearing solution

LDB offers a range of system solutions. The large diameter slewing bearing of LDB is perfectly combined with the LDB slewing drive. According to customer requirements, we provide corresponding electric or hydraulic motor control technology, so that customers can choose more easily and quickly.

LDB large slewing bearing high quality, high reliability

All components of large slewing rings produced by LDB meet the highest standards in terms of functionality and are able to meet customer needs even under extreme conditions. LDB implements a strict management program to ensure product reliability and long service life.

Unified quality management system

The LDB large slewing bearing is a trademark of excellent quality. In order to maintain high standards, LDB adopts advanced management methods, and strictly controls each development and production process, and all production processes are assembled in the computer data on file. This allows full control, monitoring and traceability. Processes are continuously improved through various assessments.

LDB large diameter slewing bearing adopts high quality raw materials

All components of LDB large diameter bearings are made of raw materials of the highest quality standards. Raw material parts are provided by qualified suppliers and audited regularly. For special raw materials, we manage production with standards that exceed the industry.

In addition to the use of 42CrMo4 alloy for large slewing ring bearings, polymer spacers are usually used for the cage between the bearing balls. However, brass alloy or steel is used as the material in extra large bearings, which can prevent corrosion and wear.

Wind Power Bearing Manufacturer

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Wind power bearing manufacturer | LDB

In addition to innovative solutions for pitch and yaw bearings, the main focus is on the development of main bearings. LDB wind turbine bearings play a crucial role in its role as a global market leader in slewing bearings. Intensive research and development has led to the successful deployment of LDB wind turbine bearing products in wind power plants (onshore and offshore) around the world.

The Wind drive

Limited resources and rising energy prices pose global challenges. At LDB wind turbine bearings, we are addressing this challenge by developing groundbreaking solutions.

In order to make progress in providing environmentally friendly energy, we are installing increasingly efficient wind power plants around the world, which are now able to compete with fossil energy resources. LDB wind turbine bearings are a strong and progressive partner in the field of onshore and offshore systems. We constantly seek innovation and breakthroughs, so that our customers can not only become part of the new energy era, but also promote the development of the new energy era, and make important contributions to ensuring a more environmentally friendly future.

Carbon dioxide free (CO2) energy obtained through wind power generation is becoming more and more important.Since the establishment of the industry, the company’s commitment to renewable energy has made it a reliable partner for all major wind power plant manufacturers.

Slewing Bearing Installation Surface

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Mechanical machining of the bearing connection surfaces on the connecting structure is required . The mounting position of slewing bearings must correspond to that shown in the drawing. If a transporting cross was delivered, it has to be removed before installation.

The corrosion protection can be removed with an alkaline cleaner. Cleaner must be prevented from coming into contact with the seals or the raceway. Remove the protective coating from the upper and the lower mounting surfaces of the slewing bearing as well as from the gear.

The corrosion protection can easily be removed, for example, using a biodegradable alkaline cleaner.

Rapid removal of the corrosion protection and low environmental impact.

The unhardened zone between the beginning and the end of the hardened region of the raceway is marked with an “S” on the inner or outer diameter of each bearing ring. On the gear ring, the hardness gap is marked on the axial surface. Wherever possible, the hardness gap “S” must be positioned outside the main load-carrying areas. If the main working area for the application is known, then the hardness gap of the ring loaded on the circum-ference must also be positioned outside the main load-carrying area.

The bearing must be completely screwed on for commissionings and test runs. Sufficient load / moment loan must be applied to avoid a slip-stick effect on the anti-friction bearing bodies.

Gearing

Entanglement hazard due to exposed gear

  • Keep hands away from moving parts

The backlash is adjusted relative to the three gear teeth marked in green and should be 0.03 – 0.04 x module.After the final tightening of the bearing,the backlash should be rechecked over the entire circumference. A tip edge radius and a tip relief must be provided on the pinion.

Slewing Bearing Installation&Storage

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Slewing Bearing Installation

LDB Slewing Bearing offers an extensive slewing bearing service

Slewing Bearing InstallationTransport and handling

Danger of life by overhead load

  • Do NOT step underneath the load
  • Use suitable slings
  • Use suitable lifting devices
  • Suitable transport tap hole are stated in the bearing drawing

Slewing bearings, like any other part of a machine, require careful handling. They should always be ransported and stored in horizontal position. For safe handling of bearings which include transport holes, high tensile lifting eye bolts must be used. In special cases an internal cross bracing (transporting cross) is required. The bearing weight must be indicated on the crate or pallet. Impact loads, particularly in a radial direction, must be avoided.

Slewing bearings Delivery condition

  • Raceway system

The slewing bearings are delivered filled with one of the greases unless no special lubricant and special grease quantities are required.

  • External contours

The external contours of the bearings (except for holes) have Cortec VCI corrosion protection applied.

  • Gearing

The gearing is not greased. The corrosion protection is applied as for the external contours.

Slewing Bearings Storage

Sensitive surface

  • Do not open the packing with a sharp blade
  • Surface may be damaged

Approx. 6 months in roofed storage areas. Approx. 12 months in enclosed, temperature-controlled areas (temperature > 12 °C ). Outside storage is not allowed.

If required, other corrosion protection agents and types of packaging can be used, e.g. long-term packaging for up to 5 years.

Longer storage periods will necessitate special preservation. After the slewing bearing has been stored for a relatively long time, an increased frictional torque may be observed caused by the suction adhesion of the sealing lip. Careful lifting of the sealing lip with a blunt object around the entire circumference and several clockwise and counterclockwise rotations of the slewing bearing through 360 degrees will reduce the frictional torque to normal.

Slewing bearings Installation

Risk of skin irritation caused by preservative

  • Safety gloves must be worn for removal
  • Pay attention to the producer’s data

Entrapment hazard when putting the load down

  • Location control before putting tazhe load down
  • Mind the staff

A flat mounting surface free of grease and oil is essential for the upper and lower ring to seat firmly. Welding beads, burrs, excessive paint and other irregularities must be removed prior to installation. The bearing rings must be completely supported by the connecting structure.

LDB Slewing bearings  recommends conducting a check on the mounting surfaces with a leveling instrument or laser equipment (this service can be provided by LDB). The flatness values should not exceed the values shown in table 1. To avoid larger deviations and the occurrence of peaks in smaller sectors, any deviation in the range of 0°–180° may only rise evenly once and fall again.

How to maintain the slewing bearing during use?

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We know that the quality of the slewing bearing itself is the main factor affecting the service life of the bearing, but no, because in addition to the quality of the bearing, there is also a very important issue, that is, the maintenance and maintenance of the bearing during its use, but, How to maintain the slewing bearing during use?

Lubrication of slewing bearing

Slewing Bearings

1. Lubrication

(1) Reduce friction and wear. In the mutual contact parts of the rings, rolling elements and cages that constitute the bearing, metal contact is prevented, and friction and wear are reduced.

(2) Extend the fatigue life. The rolling fatigue life of the bearing is extended when the rolling contact surface is well lubricated during rotation. Conversely, if the oil viscosity is low and the lubricating oil film thickness is not good, it will be shortened.

(3) Discharge frictional heat and cooling. The oil circulation method, etc., can use oil to discharge heat generated by friction or heat from the outside, and cool it. Prevent the bearing from overheating and prevent the aging of the lubricating oil itself.

(4) Others. It also has the effect of preventing foreign matter from entering the inside of the bearing, or preventing rust and corrosion.

2. Lubrication method

Bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication.

Cleaning of slewing bearing

1. Selection of cleaning materials

As the cleaning agent, cleaning agent and kerosene are generally used. In addition, pay attention to sealing the cleaning agent when not in use to avoid the entry of external magazines and contaminating the cleaning agent. In the case of inattentiveness, cleaning the bearing with the contaminated cleaning agent will not only not have a cleaning effect, but will contaminate the bearing and cause the bearing to be polluted. Running brings stress.

2. Cleaning precautions

(1) The disassembled bearing is cleaned, divided into coarse cleaning and fine cleaning, and placed in the container respectively, first put on the bottom of the metal mesh, so that the bearing does not directly contact the dirt of the container.

(2) During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, so be careful. In the rough cleaning oil, use a brush to remove grease and adhesions. After it is roughly clean, transfer to the fine cleaning.

(3) Fine cleaning is to carefully clean the bearing while rotating in the cleaning oil.

slewing bearings

Maintenance of slewing bearing

1. Maintenance method

(1) Check the state of the raceway surface, rolling surface, and mating surface, the wear of the cage, the increase of bearing clearance, and the damage and abnormality irrelevant to the decrease of dimensional accuracy.

(2) For small ball bearings, support the inner ring horizontally with one hand, and rotate the outer ring to check whether it is smooth. For separable bearings such as tapered roller bearings, the rolling elements and the raceway surface of the outer ring can be inspected separately.

2. Maintenance precautions

(1) In order to judge whether the disassembled bearing can be used, it should be checked after the bearing is cleaned.

(2) Special tools and disassembly steps and techniques should be used for bearing disassembly to avoid damage to the bearing due to the disassembly of the bearing for maintenance, which is not worth the loss.

(3) Since large bearings cannot be rotated by hand, pay attention to checking the appearance of rolling elements, raceway surfaces, cages, rib surfaces, etc. The higher the importance of the bearing, the more careful inspection is required.

The above is the summary of how to maintain and maintain the slewing bearing during the use of the slewing bearing. It can be seen that the maintenance skills in the use of the slewing bearing include lubrication, cleaning, and maintenance.

Bearing lubrication should pay attention to the selection of appropriate lubricants, pay attention to the distinction between coarse and fine washing when cleaning, and pay attention to disassembly, rotation and other issues when overhauling.

Light slewing bearings & Medium slewing bearings

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Light slewing bearings & Medium slewing bearings

LDB manufactures many types and variants of slewing rings. The most common bearings in stock or with short lead times are:

  • Single row four-point contact ball slewing bearing
  • Single row crossed cylindrical roller slewing ring

These standard slewing bearings are described on the following pages and their performance data are listed in the relevant product tables.

LDB also manufactures various other types of slewing rings. For more information on these bearings, please contact LDB Application Engineering Services.

Single ball slewing bearings

Light slewing bearings

  • with an external gear
  • with an internal gear
  • without a gear

Medium slewing bearings

  • with an external gear
  • with an internal gear
  • without a gear gear

Single roller slewing bearings

Medium roller slewing bearings

  • with an external gear
  • with an internal gear
  • without a gear

Ball Bearing Manufacturer

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Ball Bearing Manufacturer

Ball bearing is a kind of bearing, which places spherical steel balls between the inner steel ring and the outer steel ring, and transmits them by rolling, so as to reduce the friction in the process of movement and improve the mechanical power. The ball bearing cannot bear too much weight. It is often seen in light industry.

slewing bearing

The design of a ball bearing consists of four basic units:
Ball: The ball is made of high-chromium steel, with certain rolling properties and strength, and the hardness is between 61-65;Inner ring and outer ring: together form the main components of the ball bearing, the inner ring is inside and the outer ring is outside. During the movement, the inner ring and the outer ring form a concentric shaft rolling;
Cage: The cage is to fix the gap between the inner ring and the outer ring of the balls, to ensure that the balls do not contact each other during the rolling process, and to fully exert the sliding of the balls  effect.

Assembly
Advantages of ball bearings
LDB Ball bearings have significant energy savings, depending on the sophisticated motion characteristics of
the ball bearings. The friction force of the ball bearing is much smaller than that of the sliding bearing, which reduces the consumption of frictional resistance; the size of the ball bearing is standardized, the maintenance is convenient, and the installation and disassembly are convenient; the LDB ball bearing has a compact structure, light weight, and is used for small industrial equipment; the precision of LDB the ball bearing can be Adjusted according to demand, large load, small wear and long
service life.