Product Type: Four-Row Tapered Roller Bearing

1. Overview

The 381992 four-row tapered roller bearing is a high-performance unit dedicated to heavy-duty machinery. Boasting superior load-bearing capacity for heavy and impact loads, it serves as an optimal selection for essential industrial equipment.

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2. Basic Dimensions

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3. Structural Features

Component Composition: Adopting an advanced composite raceway structure with two double-raceway inner rings, one double-raceway outer ring and two single-raceway outer rings, the bearing ensures high stability.
Clearance Adjustment: Precision spacers are installed between inner and outer rings for flexible clearance control, making it adaptable to a wide range of operating scenarios.
Load-Bearing Advantage: Thanks to structural optimization, it features extraordinary load capacity and can bear heavy radial loads and certain axial loads at the same time.

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4. Load-Carrying Capacity

Radial Load Capacity: Offering 2.5–3.5 times higher radial load capacity than single-row tapered roller bearings, it maintains reliable performance even in extreme high-load applications.
Load Type Adaptability: It demonstrates outstanding performance under combined radial and axial loads (mainly radial loads) and withstands heavy loads and impacts in severe working conditions.

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5. Performance Characteristics

Limiting Speed: Owing to the sliding contact between the rib and roller end, four-row tapered roller bearings show increased friction in operation, resulting in a lower limiting speed relative to similar-size bearings.
Axial Load Capacity: In contrast to single-row tapered roller bearings limited to unidirectional axial loads, the four-row configuration is engineered to manage heavy bidirectional axial loads. This capability provides precise axial positioning and effectively controls thrust generated during rolling. Since it sustains heavy radial loads as the primary load, it is well suited for complex applications.

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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: It's a specialized component engineered for rolling mill work roll and backup roll assemblies, which is optimized to meet the stringent high-precision and heavy-load requirements inherent to European rolling mill configurations.
Other Applications: Beyond its primary rolling mill application, the component is shown to be widely adaptable to heavy-duty machinery such as cranes, mining equipment, and wind turbines, where its superior load-resistant properties are critical to operational reliability.