Your Professional Slewing Ring Bearing Manufacturer in China!
Our company was founded in 1986 and had been focusing on exporting high bearing ever since. We have a stock warehouse and provide a variety of stock bearings. For special and rare ones, we can distribute the goods to the agents in the country of origin of each brand, and the MOQ is as low as 1 set. We also have the ability to provide customers with professional bearing solutions. We work with professional bearing manufacturers and have invested over 300 million in upgrading product formulas.
Why Choose Us
01/
Rich Experience
There are nearly 40 years of bearing support and industrial service experience in our factory.
02/
Wide Market
Our products have been exported to North America, Europe, the Middle East, Brazil, South Africa, and Mexico and were well acknowledged by clients worldwide.
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Timely Delivery
Our warehouse is one of the largest product inventory warehouses. We can guarantee direct and timely delivery, and at the same time, we ensure that you get original sources of goods. If special bearings are not stocked, we can allocate cargo from the agents of original countries such as Sweden, Germany, the U.S.A., and Japan.
04/
Diverse Products
We have conventional various ball, roller, and needle bearings. And we can also provide some uncommon bearings such as non-standard bearings, linear bearings, automobile bearings, and giant bearings, as well as bearing tools such as bearing heaters, etc.
05/
Advanced Equipment
The production line of our factory is fully equipped, including manufacturing and testing machinery. We have an annual output of 5 million sets of bearings. We will check the production equipment regularly to ensure that we can produce higher-quality bearings.
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Global Shipping
Our products can be shipped from China to every corner of the world by sea, roadway and air. We ensure that every customer's order arrives on time.
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NR1.14.0544.201-3PPN Crossed Roller Bearing
*NR1.14.0544.201-3PPN Bearing . *Dimensions: 474x614x56 mm . *Weight: 38 kg. *If you wants to know Add to Inquiry -
RB 30025 UU CC0 P5 Crossed Roller Bearing
*RB 30025 UU CC0 P5 Bearing . *Dimensions: 300x360x25 mm . *Weight: 5.9 kg. *If you wants to know Add to Inquiry -
0457XRN060 Crossed Roller Bearing
*0457XRN060 Bearing . *Dimensions: 457.2x609.6x63.5 mm . *Weight: 57.1 kg. *If you wants to know Add to Inquiry -
9O-1Z30-0678-1037 Slewing Bearing
9O-1Z30-0678-1037 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z25-0384-0102 Slewing Bearing
9O-1Z25-0384-0102 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z20-0344-1075 Slewing Bearing
9O-1Z20-0344-1075 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z14-0280-0138 Slewing Bearing
9O-1Z14-0280-0138 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z16-0310-0976 Slewing Bearing
9O-1Z16-0310-0976 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z12-0222-1233 Slewing Bearing
9O-1Z12-0222-1233 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z12-0220-0532 Slewing Bearing
9O-1Z12-0220-0532 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z16-0195-1385 Slewing Bearing
9O-1Z16-0195-1385 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry -
9O-1Z20-0308-0912 Slewing Bearing
9O-1Z20-0308-0912 Slewing Bearing is a gearless slewing bearing (crossed roller slewing bearing), Add to Inquiry
Introduction of Slewing Ring Bearing
A slewing bearing or slewing ring (also called a turntable bearing) is a rotational rolling-element bearing that typically supports a heavy but slow-turning or slowly-oscillating loads in combination (axial, radial and moment loads), often a horizontal platform. Compared to a "normal" ball bearing, the rings are quite wide and usually have holes drilled in them to provide fixation to a structure. Seals can be provided between the rings to protect the rolling elements. Compared to other rolling-element bearings, slewing bearings are relatively thin section and require that the structure to which they are bolted is stiff enough so that under load predefined limits of distortion are not exceeded.
Different Types of Slewing Ring Bearing
01/
The Internal Gear Type
The internal gear type is slewing bearing with a toothed inner ring, the gear and the slewing bearing do not need to be equipped with a safety cover, and the gear has better dust resistance. The filling lubricant is kept for a long time, and the internal tooth meshing has a low transmission contact stress, a small amount of wear, and a long service life.
02/
The External Gear Type
The external gear type is slewing bearing with a tooth on the outer ring. It is a large bearing that can withstand the combined load and can withstand large axial, radial and overturning moments. This kind of structure is easy to machine and can make maximum use of the limited space of the slewing ring. If a malfunction occurs, it is easy to make a diagnosis, and the gear meshing check is also easy. Due to the large diameter of the ring gear pitch circle, a larger gear ratio can be obtained, and the circumferential force and torque on the pinion gear are greatly reduced.
03/
Single Row Ball Slewing Bearing
The single row ball slewing bearing is a four-point contact bearing, which has only one row of steel balls. They could bear axial load, radial load and tilting moment at the same time. One row four point contact balls slewing rings are composed of two seat rings, which design in compact structure and lightweight, steel ball contact with the circular raceway at four points.
04/
Single Row Crossed Roller Slewing Bearing
The single-row crossed roller slewing ring is composed of two seat-rings. It features compact in design, light in weight, high precision, and small fitting clearance. As the rollers are 1:1cross arranged, it is suitable for high precision mounting and capable to bear axial force, resultant moment and considerable large radial force. The single row crossed roller slewing bearing axial and radial clearance is smaller than single row ball slewing bearing. The rotating is not so flexible as the one-row ball bearings, usually, it is used for some higher precision applications.
05/
Double-Row Ball Slewing Bearing
The double row ball slewing bearing has two-row steel balls for structure, it has a bigger load capacity comparing to single row type slewing bearing and better safety factor. Double row ball slewing ring has three seat rings, the steel ball and the spacing block can be directly arranged into the upper and lower races, two rows of upper and lower steel balls with different diameter are fitted according to the stress condition. Double row different ball slewing bearing ring's axial and radial size are relatively large and solid in structure, so it is usually used in diameter tower cranes, truck mounted cranes.
06/
Three-Row Roller Slewing Bearing
The three-row roller slewing bearing has three-row raceway, the rolling element is steel roller. This structure could bear the heaviest load comparing to other structure bearing type. Three-row roller slewing ring is equipped with seat-rings, upper orbit. Neither orbit and radial orbit is separated individually, it makes a load of each row of the rollers can be confirmed, making it can undertake all kinds of the load simultaneously.
Benefits of Slewing Ring Bearings
All-Round Load Capacity
The best part of using slewing ring bearings in any system is that they provide 360 degrees of joint support, even when used for complex load-bearing systems. The bearings allow for a concurrent movement on multiple axes.
Shiftless Bearings
When these bearings get made, you will observe that they happen to be without a shaft/ spindle, which works as an advantage. The bearing is now an enhancement in the bearing motion and gives more space to the system's other components.
Increase in Load Capacity
You will find an automatic increase in the bearings' load-carrying capacity because of the design change. They are now capable of handling heavy loads during movement efficiently.
The Right Amount of Stiffness
The slewing ring bearings can facilitate a wide range of motions because of the high material stiffness. It is the ideal amount that is ample enough to provide support for the rigid ball bearing applications
Lesser Friction
Since the components are fewer because there aren't any shafts or spindles, you will find lesser friction that these ball bearings will impose on the movement even with heavy loads. The freedom of movement is another aspect that gives the upper hand in providing optimum efficiency. The life of the bearings gets comparatively increased because of the above factors and surrounding components.
More Service Life
The durability of such bearings increases due to the reduction in friction. The load-bearing capacity is adjusted to ensure that it reduces the stress on the bearings and the adjacent components. With the number of components decreasing, you will find that the system will last longer and have lesser maintenance issues.
Four Ways to Drive a Slewing Ring Bearing
The success of slewing ring bearings directly correlates to how the system is driven, therefore, it is important to know what options are available. When working with rotating or turntable applications, the slewing ring bearings can be driven in the following four ways.
External Gear
Most slewing ring manufacturers offer a geared option. The mating gear for any slewing ring should be made of a material that is softer than the actual gear itself. For example, a slewing ring that uses a gear made from anodized aluminum would ideally have a mating gear made of POM. Aside from the fact that POM is softer than anodized aluminum, this specific combination would make the system completely dry-running, which is an added bonus. In comparison, a slewing ring that uses both a gear and a mating gear made of aluminum, or any other metal, is ideal for intermittent movements. However, metal gears require constant lubrication, which is costly, time-consuming and messy. If a slewing ring uses a mating gear made from steel, the gear should be made of the same material in order to avoid damaging the slewing ring.
External Belt
T10 is the most cost-effective belt and is available in a variety of widths. It can also handle up to 175 pounds of tension. AT10 is a slightly more expensive option, as it can handle up to 290 pounds of tension. HTD8M is the most expensive of the three options because it offers additional features such as lower clearance and extremely quiet operation. HTD8M can handle up to 85 pounds of tension.
Worm Gear
Combining standard slewing rings with a worm gear, worm shaft and housing, the unit can be coupled directly to a DC or stepper motor using our motor mount kits for industry standard motor frame sizes. These units can be easily used in both horizontal and vertical configuration, as there are both symmetrical and asymmetrical models. Three sizes are offered in low cost, standard and high-end versions to suit the specific requirements of the application.
Drive-Plate Coupling
A drive-plate coupling connects to a motor that is assembled directly to the slewing ring. We offer a drive-plate accessory that mounts to the motor without using a gear or belt, making coupling the drive system even easier. The drive plate is available in aluminum for sizes up to 100 millimeters. For sizes larger than 150 millimeters, the drive plate comes in stainless steel so that it can handle the higher amounts of force permissible for these sizes.
The Reasons of Poor Slewing Ring Bearing Performance
Overloading
When subjected to extreme loads beyond the design capabilities of a bearing, performance suffers, and parts wear out more quickly, a result of factors like too much torque, high velocities when in operation, or sudden changes to the load.
Misalignment
With excessive vibrations caused by misalignment of the bearing, performance suffers and adds to stress on the motor, which can then lead to failure resulting from fatigue.
Improper Lubrication
An insufficient or excessive amount, or poor quality, of lubricant, causes poor bearing performance due to excess friction, which can result in overheating, leading to premature motor failure.
Improper Installation
When not installed appropriately, uneven forces cause excessive loads, resulting in worse bearing performance due to premature deterioration often instigated by overheating.
High Temperatures
When operating, electric motors generate heat that causes thermal expansion and, above a critical temperature, degradation of lubricant, negatively affecting bearing performance and lifespan.
Electric Current
Factors like static and improper grounding can produce stray voltage where it shouldn't be, affecting bearing performance when the voltage discharges by arcing through the bearings, causing pitting on the bearing's surfaces and degrading the lubricant.
Contamination
Debris, dirt, dust, and other contaminants can affect bearing performance by causing greater abrasion and wear.
Aging
Like any moving component within a mechanical device, bearings are affected by wear due to age, which can lead to heightened friction and higher noise levels, eventually leading to a breakdown.
Steps for Selecting a Slewing Ring Bearing
Step 1
Determine what is required of your application in terms of load, speed, accuracy, torque, environment, coatings, mounting arrangements, and lubrication. Early consultation with your bearing manufacturer will help assure selection of a bearing that provides the necessary features to meet your requirements.
Step 2
Determine all maximum bearing loads, being sure to include all dynamic and static loads imposed on the bearing. Consider all applied forces to the bearing and gear—not only at rated and working loads, but also loads imposed during:
Extreme weather conditions
Impact or testing
Assembly or disassembly
All other situations
These loads in turn must be simplified into the forces acting at the bearing's center.
Step 3
Multiply the resultant bearing forces by the applicable service factor (SF). Application service factors are based on a number of considerations. The primary considerations are the frequency of use at higher vs. normal loads and potential for extreme or impact loads. These factors may be superseded by customer specification, finite element analysis (FEA), or regulations by certifying authorities.
Step 4
If an integral gear is desired, determine the required gear capacity. As with bearing loads, consider all conditions that would generate potential gear loads. Examples include dynamic loads while working vs static loads; loads on incline; and overload testing. Consider also the duty cycle at each of these conditions.
Step 5
Determine the preferred mounting arrangement, considering the pinion and gear location. Consider the requirements for installation and continued maintenance of the bearing and retaining bolts. Slewing bearings can be designed to suit a number of mounting arrangements.
Step 6
Review available bearing styles and cross-sections.
Step 7
Make a preliminary selection by comparing the resultant operating bearing forces, including service factor (SF), to the bearing's rating curve. In order for a bearing to be appropriate for a given application, all required resultant force combinations should fall below the curve. Assure all extreme load conditions fall below the bearing's rating curve. If extreme load condition is static and only occurs several times during the bearing's service life, do not include the service factor. Otherwise, include the service factor. The maximum thrust rating of a bearing should exceed 3 times the maximum operating thrust force on the bearing, regardless of the moment force at that condition. These criteria are due to concern for rigidity of the supporting structure and ability to properly distribute the load around the bearing's diameter. If the bearing desired does not meet these criteria, contact the bearing manufacturer for assistance.
Step 8
Check the gear size, quality, and rating for suitability. View a sample gear rating chart, from Bearings. The chart's gear tooth rating (Fz) indicates the maximum allowable tangential gear tooth load for normal slewing bearing applications.
Step 9
Finally, confirm that the bearing you select meets all of your design requirements. Consult with bearing and other component manufacturers, and submit a completed specification data sheet to the bearing manufacturer to confirm proper bearing selection. Ultimately, the responsibility for choosing the appropriate bearing rests with the equipment designer.
Six Steps to Save Slewing Ring Bearings
Grease Regularly
Apply a liberal shot of extreme-pressure grease to the fittings around the bearing's circumference at intervals recommended in the operator's manual.
Purge with Grease
Pump greases into the bearing until you see old grease squeeze past the seal. Purged grease can help carry any contaminants out of the bearing.
Inspect the Grease
Rub some of the purged grease between your thumb and forefinger. If you see or feel grit or metal chips in it, there may be a bearing problem.
Honor Load Charts
Even slight overloads can dimple the bearing race. One 1/1000 of an inch depression will worsen with subsequent loads and cause eventual failure.
Avoid Repetitive, Heavy Loads
Lifting with the boom and undercarriage in the same position, such as repetitive curbside digging with an excavator, can put a dimple in the bearing race close to the uneven load. If possible, change the angle of approach from job to job.
Predict Failure and Repair the Bearing
If the turning torque of the bearing increases substantially, or if you notice a clicking or grinding noise when rotating the structure, grease the unit and have some of the purged lubricant analyzed for wear metals.
Our Factory
Our factory offer standard the thin-section bearings, cross roller bearings, slewing bearing etc. With over 40 years of experience, we can design and manufacture various bearings with inner diameters ranging from 30mm to 6,000mm. Our precision grade can reach class P4 (ABEC7) or higher. We have bearings in stock or half-made rings ready for further production most of the time.
Ultimate FAQ Guide to Slewing Ring Bearing
Q: Is it Possible to Refurbish Bearings?
A: Yes, but it depends. To attempt to rehabilitate a bearing product is, in most cases and for most tiny bearings, an economically inefficient endeavor. On the other hand, there is the possibility of economic advantages for bearings with six inches and greater bore sizes and larger. Specifically, suitable for refurbishment bearings include slewing rings, cylindrical roller bearings, and spherical roller bearings. However, in addition to the amount of wear accumulated, numerous other aspects are involved in this costly choice. Other factors include maintenance cycles, lubrication, environmental concerns, and more.
Q: How does a slewing ring bearing work?
A: In a slewing ring bearing, either the inner ring or outer ring will incorporate a gear mechanism where the teeth of a drive interact with the teeth of the gear. This interaction will translate the output of the drive into motion around or inside the gear.
Q: How do I know which bearing to use?
A: First, know the type and amount of bearing load that your application will place on the bearing. Small-to-medium-sized loads usually work best with ball bearings. Heavy load applications usually work best with roller bearings. Determine the rotational speed of your application.
Q: How do you measure a slewing ring?
A: It is recommended to measure the tilt clearance of the slewing ring. The tilt clearance is measured between the lower adjacent structure and the slewing bearing fastened to the upper adjacent structure. The measuring point should be as close as possible to the raceway system to keep the influence of lowed formation.
Q: What is the torque of a slewing bearing?
A: The nominal torque required to drive a slewing ring bearing is: Mnom = Mw + Mr, where Mw the resistance from the seals and Mr the moment from the rolling resistance is.
Q: What are the components of slewing bearing?
A: Its components include inner and outer rings, rolling elements, taper pins, mounting holes, seals, load plugs, taper pins, gears, oil nozzles, and part numbers.
Q: What makes bearings faster?
A: The maximum speed can be increased by use of a high speed lubricant and also with a high speed retainer. Rubber contact seals will reduce the maximum bearing speed. High precision bearings will run at higher speeds thanks to the superior roundness and finish of the balls and bearing rings.
Q: What is the minimum distance between bearings?
A: For most applications, 00075 to0010" (three quarters to one thousandth of an inch) of clearance per inch of shaft diameter is a reasonable starting point.
Q: Which bearings last longer?
A: In aggressive environments, full ceramic bearings will last significantly longer than steel bearings, but how long can depend on the chemicals in contact with the bearings, the temperature, the presence of contamination and the speed and load.
Q: Can I use old bearings?
A: Yes, you can clean them, regrease them and put them back.
Q: Can bearings get rusty?
A: With improper lubricant application, you can expect your bearings to rust and corrode easily. Metal materials are used for bearings due to their durability and tensile strength. Some bearings can resist corrosion due to chromium. Others, however, resist corrosion through thin oxide films.
Q: Can bearings dry out?
A: When the dropping point is reached, the bearing begins to bleed, the grease runs dry and eventually failure occurs. Mechanical Wring-out. Some types of rolling-element bearings are more prone to oil separation. Spherical roller bearings would be such an example.
Q: Can you over lubricate a bearing?
A: Over lubrication can cause excess heat build-up, bearing seal damage, clean up issues and increased downtime. Surplus grease in a bearing cavity will cause the rollers or balls to slide rather than turn, pushing and churning the grease out of the way.
We're well-known as one of the leading slewing ring bearing manufacturers and suppliers in China. If you're going to buy high quality slewing ring bearing with competitive price, welcome to get more information from our factory.
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