Product Description

 

Product Description

 

RU228(G)

Bearings Model Boundary Dimensions Shoulder height Basic load rating(radial) Relation between the mounting holes Weight
ID  OD  PCD  B  Oil hole rmin Inner ring Outer ring
d D dp B d1 ds Dh Cr/kN Cor/kN PCD1 mounting holes PCD2 mounting holes kg
RU228(G) 115 240 178 28 3.1 1.5 161 195 80.3 135 139 12-M8 through 217 12-ф9 throug ф14 counterbore depth 8.6 6.8

 

RU series(Integrated Inner/Outer Ring type) Since the mounting holes are provided, the model does not require a presser flange or housing. In addition, because it has an integrated inner/outer ring structure and is equipped with washers, its performance is minimally affected by the mounting procedure, ensuring stable rotation accuracy and torque. 

 

 

Crossed Roller Bearings:

 

Cross Roller Bearings are a type of roller bearing with high rotation accuracy capable of bearing loads in every direction. Because it has orthogonally arranged cylindrical rollers, it can bear loads in every direction. This lets 1 crossed roller bearing replace more than 1 ball bearing, thus saving the space required by ball bearings, lowering the associated material costs.

Key benefits of cross roller bearings:
High load capacity: cross roller bearings are designed to heavy loads in compact spaces 
Unique Design: rollers arranged perpendicular to the axis of rotation which ensures smooth and precise operation through rigidity and accuracy
Durability: highly durable and built to last minimizing downtime and maintenance costs
 

Applications:

Crossed roller bearings are commonly used in precision machinery, robotics, CNC machines, and semiconductor manufacturing equipment.

 

Types Cross Roller Bearings:
 1. RA series

 2. RB series

 3. RU series

 4. SX series

 5. XU series

 6. XSU series

 7. XR/JXR series

 8. CRBF series

 9. CRBS series

10.CRBH series

11.CRBT series

 

 

Technical parameter of precision cross cylindrical roller bearings :

RA series:

TYPE Inner diameter Outer diameter Pitch diameter Height Chamfer Shoulder size   Basic rated load(Radial)   Weight
  d D Dpw B r ds Dh Cr Kn Cor Kn KG
RA 5008 50 66 57 8 0.5 53.5 60.5 5.1 7.19 0.08
RA 6008 60 76 67 8 0.5 63.5 70.5 5.68 8.68 0.09
RA 7008 70 86 77 8 0.5 73.5 80.5 5.98 9.8 0.1
RA 8008 80 96 87 8 0.5 83.5 90.5 6.37 11.3 0.11
RA 9008 90 106 97 8 0.5 93.5 100.5 6.76 12.4 0.12
RA 10008 100 116 107 8 0.5 103.5 110.5 7.15 13.9 0.14
RA 11008 110 126 117 8 0.5 113.5 120.5 7.45 15 0.15
RA 12008 120 136 127 8 0.5 123.5 130.5 7.84 16.5 0.17
RA 13008 130 146 137 8 0.5 133.5 140.5 7.94 17.6 0.18
RA 14008 140 156 147 8 0.5 143.5 150.5 8.33 19.1 0.19
RA 15008 150 166 157 8 0.5 153.5 160.5 8.82 20.6 0.2
RA 16013 160 186 172 13 0.8 165 179 23.3 44.9 0.59
RA 17013 170 196 182 13 0.8 175 189 23.5 46.5 0.64
RA 18013 180 206 192 13 0.8 185 199 24.5 49.8 0.68
RA 19013 190 216 202 13 0.8 195 209 24.9 51.5 0.69
RA 20013 200 226 212 13 0.8 205 219 25.8 54.7 0.71

RB series:

Model No. Outer dimension (mm) Installation dimension (mm) Rated load (Kn) Weight
d D B/C Rmin da Da C C0 kg
RB2008 20 36 8 0.5 23.5 30.5 3.23 3.1 0.04
RB2508 25 41 8 0.5 28.5 35.5 3.63 3.83 0.05
RB3571 30 55 10 0.6 37 47 7.35 8.36 0.12
RB3510 35 60 10 0.6 41 51.5 7.64 9.12 0.13
RB4571 40 65 10 0.6 47.5 57.5 8.33 10.6 0.16
RB4510 45 70 10 0.6 51 61.5 8.62 11.3 0.17
RB5013 50 80 13 0.6 57.4 72 16.7 20.9 0.27
RB6013 60 90 13 0.6 68 82 18 24.3 0.3
RB7013 70 100 13 0.6 78 92 19.4 27.7 0.35
RB8016 80 120 16 0.6 91 111 30.1 42.1 0.7
RB9016 90 130 16 1 98 118 31.4 45.3 0.75
RB10016 100 140 16 1 109 129 31.7 48.6 0.83
RB1571 100 150 20 1 113 133 33.1 50.9 1.45
RB11012 110 135 12 0.6 117 127 12.5 24.1 0.4
RB11015 110 145 15 0.6 122 136 23.7 41.5 0.75
RB11571 110 160 20 1 120 143 34 54 1.56
RB12016 120 150 16 0.6 127 141 24.2 43.2 0.72
RB12571 120 180 25 1.5 133 164 66.9 100 2.62
RB13015 130 160 15 0.6 137 152 25 46.7 0.72
RB13571 130 190 25 1.5 143 174 69.5 107 2.82
RB14016 140 175 16 1 147 162 25.9 50.1 1
RB14571 140 200 25 1.5 154 185 74.8 121 2.96
RB15013 150 180 13 0.6 157 172 27 53.5 0.68

RB15571 150 210 25 1.5 164 194 76.8 128 3.16
RB15030 150 230 30 1.5 173 211 100 156 5.3
RB16571 160 220 25 1.5 173 204 81.7 135 3.14
RB17571 170 220 20 1.5 184 198 29 62.1 2.21
RB18571 180 240 25 1.5 195 225 84 143 3.44
RB19571 190 240 25 1 202 222 41.7 82.9 2.99
RB20571 200 260 25 2 215 245 84.2 157 4
RB20030 200 280 30 2 221 258 114 200 6.7
RB20035 200 295 35 2 225 270 151 252 9.6
RB22571 220 280 25 2 235 265 92.3 171 4.1
RB24571 240 300 25 2.5 256 281 68.3 145 4.5
RB25571 250 310 25 2.5 265 290 69.3 150 5
RB25030 250 330 30 2.5 269 306 126 244 8.1
RB25040 250 355 40 2.5 275 326 195 348 14.8
RB30571 300 360 25 2.5 315 340 76.3 178 5.9
RB30035 300 395 35 2.5 322 368 183 367 13.4
RB30040 300 405 40 2.5 326 377 212 409 17.2
RB35571 350 400 20 2.5 363 383 54.1 143 3.9
RB40035 400 480 35 2.5 422 459 156 370 14.5
RB40040 400 510 40 2.5 428 479 241 531 23.5
RB45571 450 500 25 1 464 484 61.7 182 6.6
RB50571 500 550 25 1 514 534 65.5 201 7.3
RB50040 500 600 40 2.5 526 572 239 607 26
RB50050 500 625 50 2.5 536 587 267 653 41.7
RB60040 600 700 40 3 627 673 264 721 29
RB70045 700 815 45 3 731 777 281 836 46
RB80070 800 950 70 4 836 900 468 1330 105
RB90070 900 1050 70 4 937 1001 494 1490 120
RB1000110 1000 1250 110 5 1057 1171 1220 3220 360
RB1250110 1250 1500 110 5 1308 1423 1350 3970 440

RU series:

Designation

Size

Shoulder dimension

Basic Load rating

Quality

Model

d

D

Dpw

B

rmin

ds  Dh

Cr
kN

Cor
kN

Kg

RU28

10 52 27.3 8 0.3 24 29.5 29 24 0.12

RU42

20 70 41.5 12 0.6 37 47 7.35 8.35 0.29

RU66

35 95 66 15 0.6 59 74 17.5 22.3 0.62

RU85

55 120 85 15 0.6 79 93 20.3 29.5 1

RU124(G)
RU124X

80 165 124 22 1 114 134 33.1 50.9 2.6

RU148(G)
RU148X

90 210 148 25 1.5 133 162 49.1 76.8 4.9

RU178(G)
RU178X

115 240 178 28 1.5 161 195 80.3 135 6.8

RU228(G)
RU228X

160 295 227.5 35 2 208 246 104 173 11.4
RU297(G)
RU297X
210 380 297.3 40 2.5 272 320 156 281 21.3
RU445(G)
RU445X
350 540 445.4 45 2.5 417 473 222 473 3504

 

Packaging & Shipping

Packing:

Please contact us for more pictures of different packing.

Universal Packing

Without any logo on bearings or packing.

JDZ Packing

With our brand JDZ on bearings and packing.

Customized Packing

Depends on buyer’s requirements.

Original Brand Packing

Bearing and packing are both original. Please contact us for pictures.

 

QUALITY ASSURANCE

100% Quality inspection to ensure the bearings are with good quality before shipping. 

Company Profile

 

 

ZheJiang CZPT Precision Bearing Co.,Ltd. was founded by ZheJiang Defa Bearing Co.,Ltd, factory is located in ZheJiang province, China. 
We are a bearing manufacturer integrating the research, development and sales of bearings, with a floor area of 18,000 square meters and a plant area of 8,800 square meters. Equipped with modern production equipment and advanced detection instruments. 

We can provide all types bearings and OEM service according to customers’ requirements. 

Our products are widely used in the automobile, agricultural, textile production, mining, printing and packing industries, in addition to various applications at airports, in air-conditioning systems, conveying devices, ships ad so on. Our products are being exported to more than 50 countries and regions overseas including Singapore, Thailand, Iran, Turkey, Poland, Italy, England, France, Russia, Germany, the United States, Australia, Argentina, Brazil as well as other countries and regions all over the world.

We are a trusted and reliable bearing supplier, choose us to be your good partner!

More choices

 

FAQ

1. Q: Are you trading company or manufacturer ?
   A: We have our own factory , our type is factory + trade.

2. Q: Could you accept OEM and customize?
    A: Yes, we can customize products according to your sample or drawing.

3. Q: How long is your delivery time? 
    A: If stock, within 7 days to ship or based on your order quantity.

4. Q: Could you supply sample for free? 
    A: Yes, we can offer the sample for free,do you mind to buy a “ticket” for her?

More details, please contact with us. Thanks for your time!

 

 

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Standard or Nonstandard: Standard
Feature: High Speed, Vacuum, Antimagnetic, Cold-Resistant, Corrosion-Resistant, Heat-Resistant
Sealing Gland: Non-Seal
Rolling-Element Number: Single-Row
Roller Type: Straight Raceway
Material: Bearing Steel
Samples:
US$ 0.1/Piece
1 Piece(Min.Order)

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Request Sample

Customization:
Available

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Customized Request

slewing bearing

What Role do Seals and Enclosures Play in Protecting Slewing Bearings from Contaminants?

Seals and enclosures play a crucial role in safeguarding slewing bearings from contaminants, moisture, and other external factors that can lead to premature wear and damage. Here’s how seals and enclosures contribute to the protection of slewing bearings:

  • Contaminant Exclusion:

Seals and enclosures create a physical barrier that prevents contaminants like dust, dirt, sand, and particles from entering the bearing’s internal components. This exclusion minimizes abrasive wear and preserves the integrity of the rolling elements and raceways.

  • Moisture and Corrosion Prevention:

Seals and enclosures provide a shield against moisture and water ingress, crucial in preventing corrosion and rust formation on bearing surfaces. Corrosion-resistant seals are particularly valuable in marine and humid environments.

  • Chemical and Chemical Vapor Resistance:

Specialized seals and enclosures can offer resistance to chemicals, acids, and corrosive substances that might be present in the operating environment. This protection prevents chemical damage to the bearing’s components.

  • Lubrication Retention:

Seals and enclosures help retain the lubricant within the bearing, preventing it from leaking out and ensuring consistent lubrication for smooth operation. This is essential for reducing friction and wear.

  • Prevention of Solid Particle Contamination:

Seals and enclosures block solid particles from entering the bearing chamber, reducing the risk of particle-induced wear, surface damage, and premature failure.

  • Temperature Regulation:

Some seals and enclosures offer thermal insulation, which helps regulate the operating temperature of the bearing. This can be crucial in applications with extreme temperature variations.

  • Enhanced Longevity:

By protecting the bearing from contaminants and adverse environmental conditions, seals and enclosures contribute to the extension of the bearing’s operational life, reducing the need for frequent replacements.

  • Sealing Types:

Seals can come in various types, including lip seals, labyrinth seals, and specialized designs. The choice of seal depends on the application’s requirements and the level of protection needed.

  • Proper Installation and Maintenance:

Proper installation and regular inspection of seals and enclosures are essential to ensure their effectiveness. Damaged or worn seals should be promptly replaced to maintain protection.

In summary, seals and enclosures serve as a critical defense mechanism for slewing bearings against contaminants, moisture, and harmful substances. They contribute to the bearing’s reliability, performance, and overall longevity in various operating environments.

slewing bearing

How does Preload Affect the Performance and Stability of Slewing Bearings?

Preload is a critical factor that can significantly impact the performance and stability of slewing bearings. It involves applying a controlled axial force to the bearing components before assembly. Here’s how preload affects slewing bearings:

  • Reduced Internal Clearance:

Applying preload reduces the internal clearance between the rolling elements and raceways. This minimizes play or clearance in the bearing, enhancing its rigidity and reducing the potential for rolling element skidding during operation.

  • Improved Stiffness:

Preloaded slewing bearings exhibit higher stiffness due to the elimination of internal clearance. This improved stiffness is crucial in applications requiring precise positioning, such as robotics and high-precision machinery.

  • Enhanced Load Distribution:

Preload improves the load distribution among rolling elements, minimizing stress concentrations and promoting uniform load sharing. This is especially important in applications with varying loads and forces.

  • Reduced Vibrations:

By eliminating internal clearance and minimizing rolling element movements, preloaded bearings experience reduced vibrations during operation. This contributes to smoother and more stable equipment performance.

  • Precise Positioning:

Preload ensures minimal movement within the bearing during rotational changes, making it suitable for applications where precise positioning and accurate motion control are essential.

  • Resistance to External Loads:

Preloaded bearings are better equipped to handle external forces and shocks without significant deformation or misalignment, maintaining consistent performance even under varying conditions.

  • Reduced Wear:

With reduced internal clearance and controlled movement, preloaded bearings experience less wear and fatigue. This extends their service life and reduces the frequency of maintenance.

  • Limitations:

However, excessive preload can lead to increased friction, heat generation, and potential damage. It’s essential to apply the right amount of preload according to manufacturer recommendations and application requirements.

In summary, preload in slewing bearings enhances rigidity, load distribution, and stability, making them suitable for applications that demand precise movement and control. Properly applied preload ensures optimal performance and extends the operational life of the bearing.

slewing bearing

Can you Explain the Differences Between Single-Row and Double-Row Slewing Bearings?

Single-row and double-row slewing bearings are two common configurations with distinct characteristics. Here are the key differences between them:

  • Design:

A single-row slewing bearing consists of one row of rolling elements positioned between the inner and outer rings. In contrast, a double-row slewing bearing has two rows of rolling elements.

  • Load-Carrying Capacity:

Double-row slewing bearings generally have a higher load-carrying capacity compared to single-row bearings. The presence of two rows of rolling elements enables them to handle heavier axial, radial, and moment loads.

  • Stiffness:

Double-row bearings offer higher stiffness due to the additional row of rolling elements. This stiffness can be advantageous in applications where precise positioning and resistance to deflection are crucial.

  • Compactness:

Single-row slewing bearings are typically more compact and have a smaller profile compared to double-row bearings. This compact design can be advantageous in applications with limited space.

  • Cost:

Single-row slewing bearings are generally more cost-effective compared to double-row bearings. The increased complexity and higher load capacity of double-row bearings can result in higher manufacturing costs.

  • Applications:

Single-row slewing bearings are suitable for applications with moderate loads and rotational requirements, where compactness is important. Examples include small cranes, excavators, and material handling equipment. Double-row slewing bearings are often used in larger and heavier machinery, such as construction equipment, wind turbines, and heavy-duty cranes.

  • Performance Trade-offs:

While double-row bearings offer higher load capacity and stiffness, they may also introduce higher friction and slightly reduced rotational efficiency compared to single-row bearings due to the presence of additional rolling elements.

In summary, the choice between single-row and double-row slewing bearings depends on factors like load requirements, available space, and desired stiffness. Each configuration has its own advantages and trade-offs, allowing engineers to tailor their selection to the specific needs of the application.

China Good quality Chrome Steel Cross Roller Slewing Bearing Ru228 Ru178 Slewing Bearing   bearing bronzeChina Good quality Chrome Steel Cross Roller Slewing Bearing Ru228 Ru178 Slewing Bearing   bearing bronze
editor by CX 2024-05-09

Slewing bearings

As one of the slewing bearings manufacturers, suppliers, and exporters of mechanical products, We offer slewing bearings and many other products.

Please get in touch with us for details.

Manufacturer supplier exporter of slewing bearings.

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