Product Type: Four-Row Tapered Roller Bearing

1. Overview

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2. Basic Dimensions

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3. Structural Features

Component Composition: The component consists of two double-raceway inner rings, one double-raceway outer ring, and two single-raceway outer rings.
Clearance Adjustment: Precise clearance tuning is achieved through spacers installed between the inner and outer rings.
Load-Bearing Advantage: Via structural optimization, the component is capable of simultaneously bearing large radial loads and a certain magnitude of axial loads.

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4. Load-Carrying Capacity

Radial Load Capacity: 2.5–3.5× single-row tapered roller bearings’ radial capacity, reliable under high loads.
Load Type Adaptability: Suitable for combined radial+axial loads (radial primary) + endures heavy/impact loads in harsh working conditions.

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5. Performance Characteristics

Limiting Speed: The structural design, especially the sliding contact between the rib and the roller end, leads to higher operational friction in four-row tapered roller bearings. Consequently, their limiting speed is relatively lower in comparison with similar-sized bearings, including four-row cylindrical roller bearings.
Axial Load Capacity: Unlike single-row tapered roller bearings that can only withstand axial loads in a single direction, the four-row structure is specially constructed to handle heavy bidirectional axial loads. This ability allows for precise axial shaft positioning and effective control of thrust during the rolling process. Importantly, while performing strongly in bidirectional thrust, it mainly supports heavy radial loads, ideal for complex combined load applications in 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

Target Application: Primarily targets work rolls and backup rolls in rolling mills.
Diverse Applications: Also ensures robust performance in other heavy-duty machinery like cranes, mining equipment, and wind turbines, where enduring high and impact loads is a key operational challenge.