Single-row Tapered Roller Bearing

Single row cylindrical roller bearings are a widely used type of rolling bearings in the mechanical field. Their structure has significant separable characteristics, including an outer ring and an inner ring component composed of an inner ring, a group of conical rollers, and a basket-shaped cage. The outer ring and the inner ring component can be separated, and according to the ISO standard, the same model of the outer ring or inner ring component can achieve international interchangeability. This structural design provides a foundation for subsequent installation, maintenance, and other operations. In terms of working principle, the extension line of the raceway of this type of bearing converges at the same point as the bearing axis. This design enables the bearing to achieve real rolling during operation, thereby having the advantage of low friction torque; at the same time, its axial load capacity is closely related to the contact angle α, which is usually between 10° and 30°. As the contact angle increases, the axial load capacity also increases accordingly, which can better adapt to the load requirements of different working conditions. In terms of performance advantages, single row cylindrical roller bearings first demonstrate ease of installation, as the inner ring and outer ring can be installed separately, and the outer ring has interchangeability, greatly reducing the operational difficulty during installation and disassembly; secondly, the clearance adjustment is flexible. During installation and use, both radial and axial clearances can be adjusted arbitrarily, and the bearing can be made more rigid through pre-integration installation, thus meeting the specific performance requirements of different equipment during operation. In terms of application fields, this type of bearing plays an important role in multiple industries: in the automotive industry, it is often used in components such as car rear axle hubs and transmission shafts, which can effectively withstand the vehicle's own weight and the radial and axial forces generated during driving, ensuring the smooth rotation of the wheels; in the industrial machinery field, such as large machine tools and high-power reducers, it can withstand the radial and axial forces generated during gear meshing, ensuring the smooth operation of the transmission system; in the energy field, whether it is a wind turbine that withstands complex loads caused by wind loads, or a drilling rig in extreme conditions, single row cylindrical roller bearings can operate stably, providing support for the normal operation of related equipment.

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Product Introduction

1. Product Definition and Core Principle

A single-row tapered roller bearing is a separable radial-thrust bearing with conical rolling elements. The inner ring and rolling elements form a separable inner ring assembly via a cage, while the outer ring exists independently. Inner ring assemblies and outer rings of the same model can achieve international universal interchangeability. The extension lines of its conical raceways all converge at the same point on the bearing axis, ensuring that the rolling elements achieve true rolling without sliding, thereby reducing friction loss and operating noise.

The core advantage of this type of bearing lies in its ability to withstand combined radial and unidirectional axial loads simultaneously. The axial load-carrying capacity increases with the increase of the contact angle (usually 10°-30°, and up to 25°-29° for large contact angle models). The size of the contact angle can be judged by the calculation coefficient e; a larger e value indicates better adaptability to bearing axial loads.

2. Core Performance Characteristics

Feature Category	Technical Details and Advantages	Implementation Principle
Low-Friction Operation	Small friction torque, low temperature rise, and low noise	Optimized rib design + ultra-high surface finish promote the formation of hydrodynamic lubricating oil film and reduce rib wear
Long Service Life	Strong stress resistance, low sensitivity to misalignment and shaft deflection	Cambered raceway design optimizes load distribution and reduces the stress peak at the end of rolling elements; the dimensional accuracy of rolling elements reaches the micron level, ensuring uniform load distribution
Easy Installation	The inner ring assembly or outer ring can be installed separately, improving maintenance and inspection efficiency	The inner ring assembly is completely separable from the outer ring, and components of the same model are interchangeable
Reliable Operation	Good preload stability and low vibration level	High consistency of rolling element profiles ensures accurate preload; optimized surface treatment enhances oil film adhesion
Adjustable Rigidity	Preload can be applied through paired installation to meet the requirements of high-rigidity equipment	Two bearings are installed in opposite directions or with the same name ends facing each other, and preload is achieved by adjusting the clearance

3. Explanation of Key Technical Parameters

Taking the typical model LM 48548 A/510 (SKF Explorer class) as an example, the core parameters are as follows:

Parameter Category	Parameter Symbol	Value	Description
Basic Dimensions	d (Bore Diameter)	34.925 mm	Datum diameter for inner ring assembly
	D (Outer Diameter)	65.088 mm	Maximum diameter of the outer ring
	T (Total Width)	18.034 mm	Overall axial width of the bearing
	B (Inner Ring Width)	18.288 mm	Axial dimension of the inner ring assembly
	C (Outer Ring Width)	13.97 mm	Axial dimension of the outer ring
Load-Carrying Performance	C (Dynamic Load Rating)	58 kN	Limit of constant dynamic load that the bearing can withstand
	C₀ (Static Load Rating)	57 kN	Limit of static load that the bearing can withstand
	α (Contact Angle)	14.083°	Determines axial load-carrying capacity, corresponding to calculation coefficient e=0.37 and load coefficient Y=1.6
Operating Parameters	Reference Speed	8500 r/min	Recommended speed for long-term stable operation
	Limiting Speed	10000 r/min	Maximum speed limit for short-term operation

4. Typical Models and Application Scenarios

Under different working condition requirements, various model series of single-row tapered roller bearings have clear adaptation directions. Among them, the 32020-32030 series focuses on medium-heavy load and medium-high speed working conditions. Relying on stable load-carrying performance and speed adaptability, it is widely used in equipment such as automobile transmission systems, injection molding machines, granulators, and new energy vehicle drive shafts, and can cope with the continuous combined load requirements during equipment operation.

The LM 48500 series focuses on precision transmission and low-noise requirements. Its rolling element profile accuracy and surface treatment process are more superior, which can effectively reduce operating noise and improve transmission accuracy. Therefore, it is often used in scenarios with strict requirements on operating stability and accuracy, such as high-end machine tool spindles and precision conveying equipment.

The large contact angle Type B models have a larger contact angle (usually 25°-29°), so their axial load-carrying capacity is significantly improved. They are more suitable for combined load scenarios dominated by axial loads, such as rolling mill housings, crusher rotors, and large boiler fan shafts. While withstanding large axial forces, they can also take into account the radial load-carrying requirements to ensure long-term stable operation of the equipment.

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