Bearings for marine reduction gears

**Bearings for Marine Reduction Gears** Home > Bearing Knowledge > The Use of Bearings for Marine Reduction Gears *Source: China Bearing Network | Time: May 14, 2014* --- Marine reduction gears play a critical role in ship propulsion systems, and the proper selection of bearings is essential to ensure smooth and reliable operation. Bearings in these systems must handle both radial and axial loads while maintaining high efficiency and durability under harsh marine conditions. In the coupling shaft system, the driving end is supported by a spherical roller bearing (designated as the locating bearing), while the other end uses a cylindrical roller bearing (known as the floating bearing). This configuration allows the shaft to transmit torque effectively while minimizing the impact of minor weight and gear forces. The bearing size is typically chosen based on visual inspection rather than detailed calculations, with larger bearings often used to enhance load capacity. The input shaft is supported by two spherical roller bearings that manage the radial load caused by gear meshing. During normal operation, the thrust load is primarily handled by a thrust spherical roller bearing. Additionally, the left bearing supports any reverse axial load that may occur. To ensure consistent performance, the thrust spherical roller bearing should be adjusted using small clearance or a tension spring for preloading. This helps prevent the rollers from losing contact with the raceway when the load fluctuates. Unlike the thrust bearing, the radial direction of the thrust spherical roller bearing is not supported within the housing, meaning it does not carry radial loads. This design ensures that the bearing remains focused on handling axial forces only. On the output shaft, both radial and axial loads must be carefully managed. Two spherical roller bearings support the radial load, while a thrust spherical roller bearing handles the axial load generated during the ship’s movement. The smaller axial load during retraction is carried by a secondary thrust bearing. These two thrust bearings are set with minimal axial clearance and preloaded to maintain stability without radial support in the housing. --- **Related Bearing Knowledge:** - Bearing Selection and Application Considerations - Heat Treatment Process and Techniques for Bearings - Common Terminology and Definitions in Rolling Bearings - Classification of Rolling Bearings - Insulation Bearings: Types and Applications --- This article was originally published on China Bearing Network. For more information, visit [China Bearing Network](http://www.chinabearing.net). Previous: Slewing Bearing Layout Next: Thrust Spherical Roller Bearing

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