Slewing Rings for Precise Positioning
Schaeffler Group Industrial (INA/FAG) develops and manufactures slewing rings with outside diameters of up to 4,000 mm that ensure optimal rotor blade adjustment and wind tracking of the nacelle. Due to their design, these slewing rings can transmit radial and axial loads as well as tilting moments. Available as single or double-row four point contact bearings, with or without gear teeth on the inner or outer rings, they enable precise angular adjustment under different loading conditions.
Wind turbines must adjust themselves to varying wind conditions. Tower and rotor blades need to be aligned in such a way that they can optimally utilize the wind conditions without being exposed to excessive stresses that might cause damage to them. So the tower and blade adjustment is vitally important for the cost-effective operation of wind turbines.
Blade adjustment (pitch bearings)
In order to control the power output of the wind turbine, the blade angle must always be optimally adjusted to the wind speed via the rotary motion of the blade bearing. Thus the blade adjustment controls the rotor speeds so as to enable power generation that is as consistent as possible. Very high loads occur in some instances from the dynamic load of the rotor blades. These loads must be transferred securely via the raceways and the screw connections of the blade bearings into the rotor hub. Single or double-row four point contact bearings with or without gear teeth on the inner or outer rings are used here.
Yaw bearing (azimuth bearing)
A slewing ring is also required in order to adjust the position of the nacelle to the wind direction. The wind load and the dynamic inertia forces are transferred via the raceways and the screw connections into the tower head. Single or double-row four point contact bearings with or without gear teeth on the inner or outer rings are used here.
Calculation ensures increased quality and reliability
Schaeffler Group Industrial has state-of-the-art software and calculation tools to assure the highest quality and reliability of its bearings and slewing rings. Schaeffler’s BEARINX® software can be used to model and calculate all bearing types, complex shafts, shaft systems and even complete gearboxes. The support reactions, the internal loads in the rolling bearings, the comparative stresses of the shafts and the most important parameters are calculated and presented in tabular and diagrammatic form. Obviously, the internal load distribution in the bearing is also precisely calculated – including the contact pressure taking into account the rolling element profile. Based on the individual rolling contact loads, BEARINX® determines the calculated bearing life more precisely than ever before. For even more detailed analysis, FEM calculations can be used to determine the influence of the adjacent construction on the rolling bearings and vice versa. The CABA3D software enables the dynamic analysis of rolling bearings. Taking into account all the degrees of freedom, the force and movement curves of the rolling elements and rings are determined, from which results (e.g. for frictional energy) can be calculated for each time period. CABA3D can thus be used, for instance, to calculate the frictional energy transmitted and the acceleration behavior of the rolling elements when they enter the load zone.
舍弗勒集团工业（冰核/ FAG ）开发和制造回转环外径达四千毫米，确保最佳的转子叶片调整和风能跟踪吊舱。由于其设计，这些回转环可以传输径向和轴向负载以及倾斜的时刻。可作为单一或双排四点接触轴承，带或不带齿轮的内部或外圈，他们能够精确的角度调整在不同负荷条件。
风力涡轮机必须使自己适应不同的风力条件。塔和旋翼桨叶需要加以调整以这样一种方式，他们可以最大限度利用风能的条件下受到过度强调指出，可能损坏他们。因此，塔和刀片的调整是极为重要的成本效益运作的风力涡轮机。
叶片调整（沥青轴承）
为了控制输出功率的风力发电机，叶片角度必须始终调整到最佳风速通过转动叶片轴承。因此，刀片调整控制转子速度，从而使发电是一致的。非常高负荷出现在某些情况下的动态负载转子叶片。这些负荷必须移交安全通过滚和螺钉连接的刀片轴承的转子枢纽。单或双排四点接触轴承带或不带齿轮的内部或外圈是用在这里。
偏航轴承（轴承方位）
阿回转支承还要求，以便调整的立场，发动机短舱的风向。在风荷载和动态惯性力转移通过滚和螺钉连接到塔头。单或双排四点接触轴承带或不带齿轮的内部或外圈是用在这里。
确保计算增加的质量和可靠性
舍弗勒集团工业已经国家最先进的软件和计算工具，以保证最高的质量和可靠性，其轴承和回转环。舍弗勒的BEARINX软件可用于计算模型和所有轴承类型，复杂的竖井，竖井系统，甚至完整的变速箱。支持的反应，内部负荷的滚动轴承，比较强调的轴和最重要的参数计算，并以表格和图表的形式。显然，内部负荷分配的同时也正是计算-包括接触压力考虑到滚动要素的配置文件。基于个人滚动接触载荷， BEARINX ®确定了轴承寿命计算更精确地比以往任何时候。对于更详细的分析，有限元计算结果可以用来确定的影响，邻近的建设的滚动轴承，反之亦然。该软件使CABA3D的动态分析滚动轴承。考虑到所有的自由度，部队和运动曲线滚动的内容和戒指有决心，从结果（如摩擦能源）可以计算出每个时期。 CABA3D因此可以使用，例如，计算摩擦能量传送和加速性能的滚动内容时，他们进入负荷区。
