Investigation of the operating behaviour of planetary roller screws with different number of threads of spindle and nut

为了将旋转运动转换为轴向运动并将扭矩转换为进给力，使用了螺杆传动，例如滚珠螺杆传动，滑动螺纹螺钉或行星滚子螺钉（PRGT）。具有相同螺帽和主轴螺纹数的PRGT（标准PRGT）由于接触点数量多，因此具有较高的承载能力。然而，最小可能的整体领先是几何和技术上的限制。因此，在许多应用中具有优势的高扭矩力传动比是不可能的。对于螺帽和主轴螺纹数不同的PRGT (new -PRGT)，总引线可以减少到标准PRGT的八分之一，而不会损失负载能力。通过这种方式，更高的扭矩传动比是可能的，这允许使用更小的驱动电机，或消除变速箱。此外，还可以实现自约束设计，例如用于夹紧装置。由于这些特性，在许多应用中，new - prgt提供了滑动螺纹螺钉和液压执行器的替代方案。然而，new - prgt的整体领先取决于部件的运动学条件和作用于接触点的力。传动行为，不像其他螺杆传动，取决于条件在每个接触点。整个研究项目的目的是用数学方法描述新prgt的传输行为，并对其进行实验研究。在第一个研究阶段，开发了基于单接触点行为的PRGT运动比描述和PRGT传动行为的基本计算算法。Standard-和new - prgt也进行了实验测试。计算模型的验证表明了进一步的研究需求。在第二个项目阶段，将创建传输行为的整体模型。已经发展的运动学关系和计算接触点行为的方法通过整个部件的内部相互关系和与结果变量的相互作用来扩展。进一步的实验研究了新prgt的行为，以验证和优化假设和相关性。

For the conversion of rotational movements into axial movements and of torques into feed forces, screw drives, such as ball screw drives, sliding thread screws or planetary roller screws (PRGT) are used. PRGT with the same thread number of nut and spindle (Standard-PRGT) are characterized by their high load capacity due to a high number of contact points. The minimum possible overall lead, however, is geometrically and technically limited. Therefore, a high torque to force transmission ratio, as would be advantageous in many applications, is not possible. For PRGT with different thread number of the nut and spindle (Neu-PRGT), the overall lead can be reduced to one-eighth of that of a Standard-PRGT without loss of load capacity. In this way, higher torque to force transmission ratios are possible, which allow for the use of smaller drive motors, or the elimination of transmissions. Also, a self-restraining design, e.g. for use in clamping devices, can be achieved. As a result of these properties, Neu-PRGT offer an alternative to sliding thread screws and hydraulic actuators in many applications. However, the overall lead of Neu-PRGT is dependent on the kinematic conditions in the component and the forces acting in the contact points. The transmission behavior, unlike other screw drives, depends on the conditions in each contact point. The aim of the overall research project is to mathematically describe the transmission behavior of Neu-PRGT and to investigate it experimentally.In the first research period, basic calculation algorithms were developed for the description of the kinematic ratios of PRGT and for the transmission behavior of PRGT, considering the behavior of a single contact point. Standard- and Neu-PRGT were also tested experimentally. The validation of the calculation models showed further research requirements.In the second project phase an overall model of the transmission behavior is to be created. The already developed kinematic relationships and methods for the calculation of the contact point behavior are expanded for this purpose by the internal interrelations of the whole component and the interactions with resulting variables. Further experiments to investigate the behavior of Neu-PRGT are used to validate and optimize the assumptions and correlations.