Cylindrical roller bearing type II 圆柱滚子轴承类型二：Double row cylindrical roller bearings 双列圆柱滚子轴承

双列圆柱滚子轴承有带圆柱或圆锥孔的多种设计。标准产品包括：

NNU   型轴承

NN   型轴承

NNUP 型轴承

Double row cylindrical roller bearings are available in various designs with cylindrical or tapered bores. Standard products include:

NNU   bearings

NN   bearings

NNUP bearings

特点和优势

*高承载能力

由于其第二排滚子，双列圆柱滚子轴承适用于较大的径向载荷。

*低摩擦（滚子端面/挡边接触区域）

开放式挡边设计，以及滚子端设计和表面光洁度，促进润滑油膜，从而降低摩擦并带来较高的基本额定载荷。

*使用寿命长

对数曲线轮廓减小了滚子/滚道接触处的边应力，并减少了对不对中和轴挠曲的灵敏性。

*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

双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。

Features and benefits

*High load carrying capacity

Due to their second row of rollers, double row cylindrical roller bearings are suitable for larger radial loads.

*Low friction (roller end/rib contact area)

The open rib design, as well as the roller end design and surface finish, promotes lubricant film, resulting in low friction and high basic load ratings.

*Long service life

The logarithmic profile reduces edge stresses at the roller/raceway contact and reduces sensitivity to misalignment and shaft deflection.

*Increased 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 double row cylindrical roller bearings are interchangeable. This facilitates mounting, disassembly and maintenance inspection.

*High speed capability

The cage design is suitable for high speeds, rapid acceleration and highest loads.