Tapered Roller Thrust Bearing

Thrust tapered roller bearings are high-performance rolling bearings specifically designed for composite working conditions involving heavy unidirectional axial loads + minor radial loads. Through the precise coordination between tapered rollers and tapered raceways, they achieve simultaneous transmission of axial and radial forces, combining high load-carrying capacity, radial positioning accuracy, and impact resistance. Adopting a modular structural design, the product can adapt to the composite load requirements of different industrial scenarios, and serves as a core component for "simplifying support systems and improving operational stability" in fields such as automotive transmission, construction machinery, and general equipment.​

I. Product Positioning and Core Value​

1. Market Positioning​

As the "composite load expert" in the thrust roller bearing family, this product fills the market gap where "pure axial bearings cannot bear radial forces and pure radial bearings have insufficient axial load-carrying capacity". It provides an integrated support solution for mechanical systems that need to cope with both types of loads. It can replace the combined solution of "thrust cylindrical roller bearings + radial bearings", reducing the number of installed bearings and lowering the structural complexity of equipment.​

2. Core Value​

Load Adaptability: As the only type of thrust bearing capable of withstanding both heavy axial loads (from several tons to hundreds of tons) and minor radial loads (≤1/5 of the axial load), it does not require additional matching with radial bearings.​

Positioning Accuracy: Models with radial flanges can achieve precise radial positioning of the shaft, with a radial runout error of ≤0.02mm, ensuring the accuracy of the transmission system.​

Working Condition Tolerance: The tapered structure and guided flange design enable the bearing to withstand impact loads and variable loads, making it suitable for harsh working conditions such as vibration and jolting.​

II. Precision Structure and Design Highlights​

1. Structural Composition (5 Core Components)​

The structure of this product is optimized around "composite load transmission" and "operational stability", and the materials and processes of key components have undergone strict screening:​

Shaft Washer (Tight Ring): Made of high-carbon chromium bearing steel (GCr15SiMn), it undergoes integral quenching (hardness HRC60-64) and precision grinding. Its inner bore forms an interference fit with the shaft, and the taper and surface finish (Ra≤0.4μm) of the tapered raceway on the end face perfectly match the rollers, ensuring uniform load transmission.​

Housing Washer (Loose Ring): It adopts the same material and heat treatment process as the shaft washer. Its outer circle forms a transition fit with the bearing housing. Some models (TT series) integrate radial flanges, and the surface finish of the flange inner bore is Ra≤0.8μm, which is used to limit the radial runout of the shaft and improve positioning accuracy.​

Tapered Rollers: Designed in a "truncated cone" shape, with guided flanges at the large end (to prevent axial displacement of the rollers). The roller surface undergoes ultra-precision grinding (Ra≤0.2μm) to ensure the line contact accuracy with the raceways. For some heavy-duty models, the rollers are made of carburized bearing steel (20CrNiMo) to enhance impact toughness.​

Cage: Two material options are available - brass cages (suitable for high-precision, high-temperature working conditions such as automotive gearboxes) manufactured by integral machining with a pocket accuracy of IT6 grade; stamped steel cages (suitable for general industrial scenarios) treated with surface phosphating for excellent rust resistance.​

Spacer Ring (Optional): Used in double-row thrust tapered roller bearings (e.g., TTB series), made of bearing steel or engineering plastics. Its function is to separate the two rows of rollers, ensure uniform load distribution, and adjust the internal clearance of the bearing (clearance range: 0.05-0.15mm).​

2. Design Highlights​

Optimized Tapered Contact: The taper angle of the raceways and rollers (usually 10°-15°) is optimized through mechanical calculations. This ensures that the contact stress is evenly distributed (maximum contact stress ≤3000MPa) during the transmission of axial and radial loads, avoiding local wear.​

Reinforced Guided Flanges: The thickness of the guided flanges at the large end of the rollers is 15% greater than the industry standard. The contact surface between the guided flanges and the flanges of the shaft washer/housing washer is polished, reducing the friction coefficient (≤0.002) and improving impact resistance.​

Separable Structure: The shaft washer, housing washer, and roller-cage assembly can be disassembled independently, facilitating installation, maintenance, and replacement, especially suitable for on-site maintenance of large-scale equipment.​

III. Product Series and Key Parameters​

1. Main Product Series​

This product covers 3 major series, adapting to the full-range composite load requirements from light-duty to heavy-duty scenarios:​

2. Key Performance Parameters (Core Indicators for Selection)

IV. Application Scenarios and Industrial Applications​

Relying on the dual advantages of "composite load bearing + radial positioning", this product is widely used in core equipment across multiple industries:​

Transportation Field:​

Automotive Gearboxes: Withstand axial forces (10-50kN) generated by gear meshing and minor radial forces (2-10kN), adapt to variable loads during gear shifting, and ensure smooth power transmission.​

Truck Differentials: Support the composite load of the half-shaft, withstand impacts caused by road bumps, and ensure synchronized rotation of wheels through radial positioning accuracy.​

Construction Machinery Field:​

Excavator Swing Reducers: Bear axial forces (50-150kN) of the swing mechanism and radial forces (10-30kN) from the machine body sway. The impact-resistant design adapts to the vibration conditions of excavation operations.​

Loader Gearboxes: Cope with load fluctuations during material shoveling and loading. The double-row TTB series can adapt to the composite load requirements of ultra-heavy loaders (load capacity ≥50 tons).​

General Industrial Field:​

Heavy-Duty Gearboxes: Provide simultaneous support for axial and radial loads of the output shaft, replace the "thrust + radial" bearing combination, and simplify the gearbox structure.​

Vertical Mixers: Support the axial pressure (5-20kN) of the mixing shaft and radial vibration loads (1-5kN), ensuring stable rotation of the mixing paddles.​

Precision Equipment Field:​

CNC Lathe Spindles: Provide axial positioning and radial auxiliary support at low speeds (500-1500r/min), with an end runout error of ≤0.03mm to ensure machining accuracy.​

Printing Machine Press Rolls: Withstand axial forces (3-10kN) from imprinting and radial runout of the rolls, ensuring clear and non-offset printed patterns.​

V. Summary of Product Advantages​

Integrated Support for Composite Loads: A single set of products can withstand both axial and radial loads without matching other bearings, simplifying equipment structure and reducing procurement and installation costs.​

High-Precision Radial Positioning: The radial flange design of the TT series enables precise positioning of the shaft with small radial runout errors, ensuring the accuracy of the transmission system.​

Strong Tolerance to Harsh Working Conditions: Reinforced guided flanges and optimized tapered contact enhance resistance to impact and variable loads, making it suitable for harsh environments such as vibration and jolting.​

Full-Scenario Series Coverage: From the light-duty TTF series to the heavy-duty TTB series, it meets different load requirements and is suitable for applications in automotive, engineering, industrial and other fields.​

Convenient Installation and Maintenance: The separable structure facilitates maintenance, and standardized dimensions are compatible with general installation tools, reducing maintenance difficulty and downtime.

Hot Tags: tapered roller thrust bearing, China tapered roller thrust bearing manufacturers, suppliers, factory