Double Row Tapered Roller Bearings
What is Double Row Tapered Roller Bearings
Double row tapered roller bearings are the unsung heroes in the world of industrial machinery, providing robust performance and unparalleled durability. They are engineered with a double row of tapered rollers, allowing them to handle combined radial and axial loads effectively. This unique design not only enhances load-bearing capacity but also ensures a longer lifespan for the machinery they support.
Benefits of Double Row Tapered Roller Bearings
Load-Bearing Capacity
One of the primary advantages of double row tapered roller bearings is their superior load-bearing capacity. The double row design allows them to support both radial and axial loads, making them ideal for heavy-duty applications. This capability ensures stable and reliable performance even under high-stress conditions.
Longevity and Reliability
These bearings are known for their longevity and reliability, which are critical in industrial applications. The robust design and high-quality materials used in their construction ensure a long service life, reducing the need for frequent replacements. Reliable performance translates to fewer operational disruptions and lower maintenance costs.
Cost-Effectiveness
Although double row tapered roller bearings may have a higher initial cost compared to other bearing types, their long-term benefits make them cost-effective. The extended lifespan and reduced maintenance requirements result in significant cost savings over time. Investing in high-quality bearings ultimately leads to lower total ownership costs and higher operational efficiency.
Product Features In order to obtain low friction torque, high rigidity, and good rotation accuracy of the bearing, steel balls with small outer diameters are used. The use of hollow shafts ensures light weight and space for wiring. Thin-walled bearings realize an extremely thin bearing section.
Product Features In order to obtain low friction torque, high rigidity, and good rotation accuracy of the bearing, steel balls with small outer diameters are used. The use of hollow shafts ensures light weight and space for wiring. Thin-walled bearings realize an extremely thin bearing section.
In the past 40 years, new mechanical parts have gradually emerged around the world. It consists of inner and outer rings, rolling elements, etc. The slewing bearings produced in my country are mainly introduced by the Tianjin Construction Machinery Research Institute designated by the Ministry of Machinery Industry in the early 1980s.
According to whether the ring has ribs or not, it can be divided into single row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double row cylindrical roller bearings such as NNU and NN. The bearing is a structure in which the inner ring and the outer ring can be separated.
Sliding bearings have neither inner and outer rings nor rolling elements, and are generally made of wear-resistant materials. Commonly used in low speed, light load and mechanical rotating parts that are difficult to lubricate and maintain.
When the outer ring is particularly thick, it is installed in groups on the stationary shaft to become the bearing of the support roller.
According to the force, it is divided into one-way thrust ball bearings and two-way thrust ball bearings. One-way thrust ball bearing can bear one-way axial load. Two-way thrust ball bearing can bear two-way axial load, in which the shaft ring is matched with the shaft.
Thrust Spherical Roller Bearings
Thrust ball bearing composition: Thrust ball bearing consists of three parts: seat washer, shaft washer and steel ball cage assembly. The shaft washer matched with the shaft and the seat ring matched with the housing.
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Mechanical Behavior of Double-Row Tapered Roller Bearing Under Combined External Loads and Angular Misalignment
In practical engineering applications, single-row tapered roller bearings are usually assembled into double-row bearings to adapt to heavy-load conditions. The characteristics of double-row tapered roller bearings largely determine the operating safety and stability of the machinery. Therefore, the characteristics of double-row tapered roller bearings largely determine the operating safety and stability of the machinery. The mechanical behavior of double-row tapered roller bearings is discussed by extending the three-degree-of-freedom mathematical model. A comprehensive analysis method for double-row tapered roller bearings under combined loads and angular misalignment. At the same time, centrifugal loads are considered based on the three-degree-of-freedom theory. Unlike other studies, this paper takes external loads and angular misalignment as so-called mixed input parameters to study the torque resistance, contact load and fatigue life of double-row tapered roller bearings under different loads. At the same time, the influence of external loads, axial pre-deformation, bearing speed and angular misalignment on the characteristics of double-row tapered roller bearings is discussed through comprehensive calculation. The results show that angular misalignment and axial pre-deformation have a great influence on torque; the contact state between the roller and the inner ring of the bearing, and the contact state between the roller and the guide rib of the bearing are greatly affected by the above factors; the fatigue life of the double-row tapered roller bearing depends largely on the bearing speed, external load and angular misalignment. The analysis method and results reveal several important aspects of the double-row tapered roller bearing in application, which is helpful for the selection, design and assembly of bearings.
Classification of Tapered Roller Bearings
Single row tapered roller bearings have an outer ring, an inner ring assembly of which the inner ring and a set of tapered rollers are enclosed by a basket cage. The outer ring can be separated from the inner ring assembly.
According to the ISO tapered roller bearing dimension standard, the outer ring or inner ring assembly of any standard type of tapered roller bearing should be able to achieve international performance with the same type of outer ring or inner ring assembly. exchange. That is to say, the outer ring of the same type must comply with the ISO492 (GB307) regulations in addition to the external dimensions and tolerances, and the cone angle of the inner ring component and the diameter of the component cone must also comply with the relevant regulations for interchangeability.
Generally, the taper angle of the outer ring raceway of a single-row tapered roller bearing is between 10° and 19°, which can bear the combined effect of axial load and radial load at the same time. The larger the cone angle, the greater the ability to bear the axial load. Bearings with large taper angle, post code plus B, taper angle between 25°~29°, it can bear large axial load. In addition, single row tapered roller bearings can adjust the size of the clearance during installation.
The outer ring (or inner ring) of a double row tapered roller bearing is a single piece. The small end faces of the two inner rings (or outer rings) are similar, and there is a spacer in the middle. The clearance is adjusted by the thickness of the spacer. The thickness of the spacer can also be used to adjust the pre-interference of the double-row tapered roller bearing.
Four-row tapered roller bearing, the performance of this type of bearing is basically the same as that of double-row tapered roller bearing, but the radial load is larger than that of double-row tapered roller bearing, and the limit speed is slightly lower. It is mainly used for heavy machinery.
Double Row Tapered Roller Bearings Size Chart
|
SL |
Bearing |
d |
D |
B |
r |
Basic Dynamic |
Basic Static |
Limiting |
Oil |
Mass (kg) |
|
1 |
30203 |
15 |
35 |
11 |
0.6 |
20800 |
20700 |
10000 |
14000 |
0.081 |
|
2 |
30204 |
20 |
42 |
14 |
1 |
27000 |
27200 |
8700 |
12000 |
0.127 |
|
3 |
30205 |
25 |
52 |
15 |
1 |
31500 |
33700 |
7500 |
10000 |
0.156 |
|
4 |
30206 |
30 |
62 |
18 |
1 |
41500 |
44800 |
6500 |
8700 |
0.236 |
|
5 |
30207 |
35 |
72 |
17 |
1.5 |
55100 |
60900 |
5600 |
7400 |
0.344 |
|
6 |
30208 |
40 |
80 |
18 |
1.5 |
62900 |
69200 |
5000 |
6700 |
0.434 |
|
7 |
30209 |
45 |
85 |
19 |
1.5 |
67200 |
77400 |
4600 |
6100 |
0.502 |
|
8 |
30210 |
50 |
90 |
20 |
1.5 |
76500 |
91700 |
4300 |
5700 |
0.566 |
|
9 |
30211 |
55 |
100 |
21 |
2 |
94600 |
113000 |
3900 |
5200 |
0.732 |
|
10 |
30212 |
60 |
110 |
22 |
2 |
106000 |
127000 |
3500 |
4700 |
0.945 |
Double Row Tapered Roller Bearings Installation
Installing double row tapered roller bearings, each bearing components must be installed in the correct order. Component to a letter recognition. All parts of the same bearings are marked with the same serial number, so if you want to install several bearings, there is no risk of confusion parts.
In most applications, rolling mill, the load on the outer direction is constant, so that only about a quarter of the outer ring raceway under load. Therefore, the side of the outer ring is divided into four regions, labeled with I to IV. Load area I also met with a mark out of the loop through the outer surface of the cable.
Bearing first installed, it is usually placed in the area I load direction. Chocks reinstalled, the outer ring should be rotated 90 degrees so that the next area to withstand loads. If necessary, detailed installation instructions can be provided together with the bearing.
Installing smaller TDI bearing structure, attention should be relatively thin intermediate zone does not occur due to compressional deformation, for example, tighten the bearing cap screws. This will cause the bearing axial clearance is too small or too high preload. Therefore, it is recommended to provide suitable bearing in the bearing cover the width of the socket, this kind of bearing into the bearing housing.
Design Features of Double Row Tapered Roller Bearings
Structural Components
Double row tapered roller bearings consist of an inner and outer ring, each with tapered raceways, and a double row of tapered rollers. The rollers are arranged in such a way that they converge at a single point on the bearing axis. This design allows the bearings to support large radial and axial loads simultaneously.
Materials Used in Manufacturing
The materials used in manufacturing these bearings are crucial for their performance and durability. High-quality alloy steels are commonly used due to their strength and resistance to wear and fatigue. Advanced heat treatment processes further enhance the hardness and toughness of these materials, ensuring the bearings can withstand harsh operating conditions.
Design Innovations for Enhanced Durability
Recent innovations in bearing design focus on improving load distribution and reducing friction. Enhanced cage designs and optimized roller geometries contribute to better performance and longer service life. Additionally, the use of advanced coatings and surface treatments can significantly enhance wear resistance and reduce maintenance requirements.
What Is the Difference Between Double Row Tapered Roller Bearings and Four Row Tapered Roller Bearings
Double row tapered roller bearings and four row tapered roller bearings belong to rolling bearings, the difference lies in the structure and application occasions.
The structure of double row tapered roller bearing is composed of two outer rings, two inner rings and a group of rollers, wherein the rollers are arranged in double rows. The fault tolerance rate is high, the bearing capacity is large, and it is suitable for the occasion of radial and axial load at the same time.
The structure of four row tapered roller bearings is composed of four outer rings, four inner rings and a group of rollers, which are arranged into four rows, its density, bearing capacity is more powerful than double row tapered roller bearings, suitable for bearing greater radial and axial loads.
Double row tapered roller bearings are mainly used in automobiles, machine tools, light machinery and other applications, while four row tapered roller bearings are suitable for metallurgy, mining, cranes, ships and other heavy machinery and equipment applications.
In addition to the differences in the number and structure of rollers, there are also some differences in installation and maintenance between double row tapered roller bearings and four row tapered roller bearings. Because of the more complex structure of four row tapered roller bearings, more care is needed in installation and maintenan.
Tapered roller bearings are uniquely designed to manage both radial and axial loads due to their tapered geometry. The inner and outer raceways are also tapered, forming a conical surface along which the rollers move. This design allows the roller axes to converge at a point on the bearing's main axis, which enables the bearings to handle loads in multiple directions more efficiently than bearings designed to handle radial or axial loads alone.
The mechanics of tapered roller bearings are sophisticated yet highly effective. When a load is applied, the tapered rollers distribute the load evenly across the bearing, accommodating both radial and axial forces simultaneously. The larger end of each roller contacts the cone, while the smaller end contacts the cup. This arrangement allows the bearing to support heavy radial loads and significant thrust loads in one direction. The angle of the cone, typically between 10 and 16 degrees, is crucial as it determines the ratio of radial to axial load the bearing can support.
The ability to handle combined loads makes tapered roller bearings invaluable in applications such as gearboxes, where rotational speeds and directional forces vary significantly. Moreover, the design's ability to deal with misalignment and shock loads adds to the robustness, making tapered roller bearings a preferred choice for tough industrial environments.
The effective distribution of forces across the rollers reduces wear and extends the life of the bearing, making tapered roller bearings a cost-effective choice for many critical applications. Understanding these mechanics is essential for engineers and technicians as they design and maintain machinery that demands high levels of reliability and efficiency.
Our Factory
Linqing Tuocheng Bearing Co., Ltd. was established in June 2002 and is located in Panzhuang Town, Linqing City, Liaocheng City, Shandong Province. It has been committed to the research and development, production, sales and service of high-quality bearings. Each bearing produced by the company is developed from the requirements of safety, high temperature resistance and wear resistance. The company's products are exported to more than a dozen countries such as Russia, Lithuania, Iran, and Dubai. During the development of the company, a team of talents with reasonable structure, proficient business, superb technology, courage to develop and innovate and high loyalty has been created. The company firmly believes that the value of the brand itself lies in quality, and it is necessary to establish an honest and responsible system for users in order to produce bearing products with market competitiveness. Professional and technical personnel strictly check the whole process from factory inspection to product safety inspection to ensure first-class product quality. Our mission is to provide consumers with high-quality bearings to ensure customer satisfaction and rights. In the future, the company will continue to break the routine and surpass itself, develop new technologies and new functional products, make high-tech humanization, promote the upgrading of the industry, and make positive contributions to the development of society and economy.
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