Product Type: Four-Row Tapered Roller Bearing

1. Overview

The 3806/558.8 four-row tapered roller bearing stands as a high-performance component, uniquely engineered for heavy-duty machinery. Its outstanding load-bearing and impact-resistant properties make it an ideal solution for vital industrial equipment.

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2. Basic Dimensions

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3. Structural Features

Component Composition: An advanced composite raceway design — comprising two double-raceway inner rings, one double-raceway outer ring, and two single-raceway outer rings — ensures outstanding stability.
Clearance Adjustment: Precision spacers built between the inner and outer rings allow flexible clearance adjustment to suit a wide range of operating conditions.
Load-Bearing Advantage: Structural optimization delivers exceptional load capacity, easily accommodating large radial loads along with certain axial loads at the same time.

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4. Load-Carrying Capacity

Radial Load Capacity: The bearing provides 2.5–3.5 times the radial load capacity of single-row tapered roller bearings, maintaining high reliability even in extreme heavy-load working scenarios.
Load Type Adaptability: It excels at bearing combined radial and axial loads (mainly radial loads) and stands firm against heavy loads and impacts in harsh industrial working conditions.

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5. Performance Characteristics

Limiting Speed: Owing to the structural design that creates sliding contact between the rib and roller end face, four-row tapered roller bearings generate higher friction during operation. Therefore, their limiting speed is relatively lower than that of other bearings of the same size, such as four-row cylindrical roller bearings.
Axial Load Capacity: Although single-row tapered roller bearings can only withstand axial loads in one direction, four-row tapered roller bearings are specially designed to support heavy axial loads from both directions. This bidirectional performance ensures precise axial positioning of the shaft and effective control of thrust generated during rolling. It should be noted that while providing excellent bidirectional thrust resistance, the bearing mainly carries heavy radial loads, making it ideal for complex combined load environments like rolling mills.

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6. Material & Manufacturing

Heat Treatment: Special heat treatment process applied to enhance hardness, wear resistance, and fatigue life.

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7. Application Fields

Primary Application: Core usage focuses on work rolls and backup rolls in rolling mills, fully meeting the harsh operating requirements of the rolling industry.
Other Applications: It is suitable for diverse heavy-duty mechanical devices such as cranes, mining machinery and wind turbines, effectively enduring high loads and impact loads in complex working environments.