Cylindrical roller bearing type three 圆柱滚子轴承类型三：
Four-row cylindrical roller bearings 四列圆柱滚子轴承
四列圆柱滚子轴承可提供多种不同的设计。
带圆柱孔或圆锥孔
开式或密封
四列圆柱滚子轴承几乎全部用于轧钢机架、轧光机和辊压机的轧辊颈。由于这些轴承通常以过盈配合安装在轧辊颈上，四列圆柱滚子轴承特别适合轧钢速度高的轧钢机应用。
由于四列圆柱滚子轴承只能承载径向载荷，所以它们与深沟槽或角接触球轴承一起安装，或者与承受轴向载荷的圆锥滚子轴承（径向或推力设计）一起安装。
Four-row cylindrical roller bearings are available in a number of different designs.
With cylindrical or tapered bore
Open or sealed
Four-row cylindrical roller bearings are used almost exclusively on roll necks in rolling stands, calenders and roller mills. As these bearings are usually mounted on the roll necks with an interference fit, four-row cylindrical roller bearings are particularly suitable for rolling mill applications with high rolling speeds.
As four-row cylindrical roller bearings can only carry radial loads, they are mounted in conjunction with deep groove or angular contact ball bearings or with tapered roller bearings (radial or thrust design) for axial loads.
特点和优势
*非常高的承载能力
由于滚子数量众多，四列圆柱滚子轴承适用于非常重的径向载荷。
*低摩擦（滚子端面/挡边接触区域）
开放式挡边设计与滚子端设计和表面光洁度有利于润滑油膜成形，从而导致较低的摩擦。
*使用寿命长
滚子对数曲线轮廓减小了滚子/滚道接触处的边缘应力，对数曲线轮廓还有利于轴承承受不对中和轴挠曲。
*提高运行可靠性
滚子和滚道接触面的表面处理有利于流体动压润滑油膜的形成。
*可分离和互换
四列圆柱滚子轴承的分离组件是可互换的。这样便于安装、拆卸和维护检验。
*高速能力
保持架设计适用于高速、快速加速和最高载荷。
*低横截面高度
四列圆柱滚子轴承的低横截面高度允许使用与滚子直径相比较大的滚子颈直径。
Features and Benefits
*Very high load carrying capacity
Due to the large number of rollers, four-row cylindrical roller bearings are suitable for very heavy radial loads.
*Low friction (roller end/rib contact area)
The open rib design together with the roller end design and surface finish favours lubricant film formation, resulting in lower friction.
*Long service life
The logarithmic roller profile reduces edge stresses at the roller/raceway contact and helps the bearing withstand misalignment and shaft deflection.
*Improved operational reliability
The surface treatment of the roller and raceway contact surfaces promotes the formation of a hydrodynamic lubricant film.
*Separable and interchangeable
The separable components of four-row cylindrical roller bearings are interchangeable. This facilitates mounting, dismounting and maintenance inspection.
*High-speed capability
The cage design is suitable for high speeds, rapid acceleration and highest loads.
*Low cross-sectional height
The low cross-sectional height of four-row cylindrical roller bearings allows the use of a larger roller neck diameter compared to the roller diameter.