Rolling Needle And Thrust Cylindrical Roller Composite Bearing

The needle roller and thrust cylindrical roller composite bearing is the core sub-type of needle roller and thrust composite bearings. Through the coaxial integration of the radial needle roller unit and the axial thrust cylindrical roller unit, it achieves "radial load + medium to high axial load" composite bearing capacity within a compact space. It is particularly suitable for transmission scenarios with large axial loads and strict space requirements, and is a key supporting component for high-load demands in small and medium-sized precision machinery.

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Product Introduction

Needle and thrust cylindrical roller combined bearings are composite bearings designed specifically for scenarios requiring "compact space + medium-to-high axial loads". By coaxially integrating a radial needle roller unit and an axial thrust cylindrical roller unit, they achieve "simultaneous bearing of radial and axial loads". Serving as core components for high-load transmission in small and medium-sized precision machinery, they replace traditional split bearing combinations and optimize equipment structures.

1. Core Positioning: Addressing the Pain Points of "Limited Space + High Loads"

Scenario Adaptation: Focus on transmission scenarios with large axial loads (5-50kN) and limited installation space, such as servo motor output shafts, washing machine dehydration shafts, and agricultural machinery gearboxes. Compared with traditional split bearings (needle roller + thrust bearings), they save over 35% of axial space and more than 30% of radial space.

Value Positioning: The "integrated structure" simplifies assembly (reducing the number of parts by 40%) and improves precision (radial runout ≤0.01mm), while balancing high load-bearing capacity and low loss. It meets the demand for "small size and high performance" bearings in automation, home appliances, agricultural machinery and other fields.

2. Core Structure: Two Units Cooperating with Clear Responsibilities

Adopting a rigid "radial-axial" integrated connection, the two units bear loads specifically:

Radial Needle Roller Unit: Consists of high-hardness needle rollers (HRC60-62, diameter 2-8mm) and a metal cage. Some models have no inner ring (requiring shaft journal hardness ≥HRC58). It transmits radial loads through line contact, with a radial rated dynamic load of 15-80kN. Its size is 30%-40% smaller than that of split needle roller bearings.

Axial Thrust Cylindrical Roller Unit: Comprises cylindrical rollers (diameter 3-10mm) and ultra-precision ground thrust washers (flatness ≤0.005mm). It bears axial forces through line contact, with an axial rated dynamic load of 5-50kN-2-3 times higher than that of thrust ball bearings, and has stronger impact resistance.

Auxiliary Structure: Some models are equipped with double-sided rubber seals (nitrile rubber) or dust covers to prevent impurity intrusion and retain lubrication, extending the maintenance cycle to 2000-5000 hours.

3. Core Performance: Four Advantages Meeting Demands

High Load-Bearing Capacity: The maximum axial rated dynamic load reaches 50kN, and it can withstand short-term impacts of 1.5-2 times the rated load, adapting to medium-to-high load scenarios such as washing machine centrifugal force and motor axial thrust.

High Precision: With radial tolerance grade P5-P6, radial runout ≤0.01mm and axial movement ≤0.008mm, it ensures precise equipment transmission (e.g., servo motor positioning accuracy).

Low Loss: The friction coefficient under grease lubrication is ≤0.0025, and the operating temperature rise is 8-12℃ lower than that of split bearings, reducing energy consumption by 5%-8%.

Space-Saving: The axial thickness is ≤20mm (when bearing 20kN), only 57% of that of split combinations; the radial size is 60%-70% of that of cylindrical roller bearings with the same load-bearing capacity, adapting to the installation of compact components.

4. Typical Scenarios: Core Applications in Four Fields

Application Field	Key Component	Example Adaptable Model	Core Load-Bearing Requirement
Industrial Precision Transmission	600W-5kW Servo Motor Output Shaft	INA KZT Series	Radial Torque + Axial Thrust (5-15kN)
Heavy-Duty Home Appliance Components	≥10kg Drum Washing Machine Dehydration Shaft	Domestic RNAX-T Series	Radial Centrifugal Force (8-12kN) + Axial Water Pressure (10-15kN)
Agricultural & Construction Machinery	Small Tractor Gearbox	SKF NX-T Series	Shifting Radial Load (20-35kN) + Shifting Axial Force (15-25kN)
Automotive Transmission Auxiliary	New Energy Vehicle Reducer	SKF NX-T Series	Radial Load (25-40kN) + Shifting Axial Force (15-20kN)

5. Key Selection Tips: Three "Checks" and One "Customization"

Check Loads: Different models correspond to radial loads of 15-80kN and axial loads of 5-50kN (e.g., INA KZT Series has an axial load of 8-30kN, while SKF NX-T Series has an axial load of 10-50kN).

Check Sizes: It is compatible with shaft diameters of 12-60mm, with radial dimensions of 8-35mm and axial dimensions of 10-28mm. The size must match the equipment installation space.

Check Working Conditions: Choose sealed models for dusty environments, high-temperature grease models for high temperatures (≤150℃), and stainless steel models for food-grade scenarios.

Choose Customization: Cages (brass/engineering plastic) and lubrication methods (grease/oil lubrication) can be customized to meet the needs of special equipment.

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