Promising rotation-translation converters

Sokolov, P. A.; Blinov, D. S.; Ryakhovskii, O. A.; Ochkasov, E. E.; Drobizheva, A. Yu.

doi:10.3103/s1068798x08100079

Cited by 18 publications

(7 citation statements)

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“…The number of the balls is equal to the number of the roller turns along the generatrix. 22 Thus, the axial load is transmitted through multiple contact areas at each side of the rollers. Due to the different radii of curvature in a pair of principal plane, the contacts between the nut/screw and the rollers can be described as ellipsoid-on-flat contacts, whose characteristics are formulated using Hertzian theory.…”

Section: Mechanical Structurementioning

confidence: 99%

An improved thermal estimation model of the inverted planetary roller screw mechanism

Qiao

Liu

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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The inverted planetary roller screw mechanism has recently become competitive in the electro-mechanical actuation system due to its high load-carrying capacity and small assembly size. However, a significant amount of heat at the frictional contact interfaces and power loss inside the electrical machine can be naturally generated in a compact and high-load inverted planetary roller screw mechanism system. The conductive heat leads to the temperature rise of inverted planetary roller screw mechanism components that subsequently results in thermal drift and error as well as the actuation accuracy degradation. An analytical approach is applied to calculate the friction torque of the contact pairs and support bearings in the inverted planetary roller screw mechanism system. As the thermal load, heat generation is derived from the friction in nut-roller-screw section and bearings. Then, the heat generation and convection boundary conditions are formulated to facilitate thermal behavior analysis. Finally, using the finite element method, steady-state and transient thermal-mechanical coupling analyses are performed to estimate the temperature distribution and thermal expansion of the inverted planetary roller screw mechanism components. Computational results reveal that operating conditions of rotation speed and external load have significant influence on the thermal characteristics of the inverted planetary roller screw mechanism. This study can serve as a foundation for modeling temperature field and analyzing coupled thermal-mechanical response of inverted planetary roller screw mechanism in electro-mechanical actuation system, which can be useful in determining thermal error compensation.

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Section: Mechanical Structurementioning

confidence: 99%

An improved thermal estimation model of the inverted planetary roller screw mechanism

Qiao

Liu

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Then, very few fundamental researches have been performed to improve the design and the lifetime calculation. Yet, as the PRS becomes interesting for critical application like actuators for the aeronautics, some work has been made in recent years to better understand its kinematics [2,3].…”

Section: Fig 1 Prs Main Componentsmentioning

confidence: 99%

“…A complete analysis of the PRS is provided by Velinsky et al [3]. This approach gives the global axial sliding speed considering the angular speed of the screw Eq.…”

Section: Dynamic Featuresmentioning

confidence: 99%

Wear Behavior of Martensitic Stainless Steel in Rolling-Sliding Contact for Planetary Roller Screw Mechanism: Study of the WC/C Solution

et al. 2016

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The planetary roller screw mechanism is used in the aeronautics industry for electro-mechanical actuators application. It transforms a rotational movement into a translation movement, and it is designed for heavy loads. The main components are made of martensitic stainless steel, and lubricated with grease. Like most usual rolling mechanisms, smearing and jamming can occur before the theoretical fatigue lifetime, especially in poor lubrication conditions. The actuated load is carried by small contacts between the threads of the screw, the rollers and the nut. The static single contact can be described as an ellipsoid on flat contact with high contact pressure (3-4 GPa). The motion consists of rolling with spin associated with side slip up to 10%. The aim of our study is to investigate the wear behavior of the WC/C coated contact for different operating and design parameters such as load, speed and slip ratio. The contact is simulated by a free rolling roller loaded on a rotating disk. A specific apparatus is used to create a contact with a side slip component, i.e. perpendicular to the rolling direction. The wheel rolling speed and the tangential force generated by the slip ratio are measured. The wear behavior of a WC/C carbon-based composite coating is investigated. It reveals progressive wear and cracking in the rolling direction, i. e. perpendicular to the sliding direction. A wear map has been drawn to establish the damage mode depending on the contact conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental simulation of rolling–sliding contact for application to planetary roller screw mechanism

Aurégan

Fridrici

Kapsa

et al. 2015

Wear

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Promising rotation-translation converters

Cited by 18 publications

References 0 publications

An improved thermal estimation model of the inverted planetary roller screw mechanism

An improved thermal estimation model of the inverted planetary roller screw mechanism

Wear Behavior of Martensitic Stainless Steel in Rolling-Sliding Contact for Planetary Roller Screw Mechanism: Study of the WC/C Solution

Experimental simulation of rolling–sliding contact for application to planetary roller screw mechanism

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