Theoretical Study of the Load Distribution on the Threads for Roller Screw Mechanisms of a Friction Type

Жданов, А. В.; Morozov, V. P.

doi:10.1016/j.proeng.2016.07.152

Cited by 16 publications

(11 citation statements)

References 5 publications

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“…Recently, planetary roller-screw mechanisms (RSM) have become widely used among executive mechanisms used for converting rotary movement into linear displacement [1][2][3][4][5][6]. In papers [2, 3, 6] we have shown methods for calculating the main technical characteristics of those mechanisms.…”

Section: Intruductionmentioning

confidence: 99%

“…The screw gear smoothness is the cause of decreased RSM vibroactivity and noise and makes those mechanisms promising for use. As for RSM, the closest analogues for the design models are planetary gear mechanisms [4,5] and rolling bearings [6,7] which vibrational processes have been studied sufficiently. However, the use of calculation procedures developed here and practical recommendations for the RSM vibrations reduction is unjustified, because of the changing characteristics and difference between screw mechanisms [8,9].…”

Section: Intruductionmentioning

confidence: 99%

“…The dependence of elastic deformation on the normal force (in case of linear contact of two bodies) is nonlinear [4]. In order to use in a linear equation system additional force caused by the undulation and vibrating the mechanism we will find the linear approximation by way of using direct linearization method.…”

Section: Vibroactivity Calculation Of Rsmmentioning

confidence: 99%

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Vibration decrease of electromechanical actuators based on roller screw mechanisms

et al. 2017

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Abstract. The reduction of the vibratory activity of the roller screw mechanism (RSM) for converting a rotational movement into a translational movement is discussed. A mathematical model of vibratory activity roller screw mechanisms on the basis of elastic compliances was developed. The resulting equation for calculating the natural frequencies of the basic RSM elements -screw, rollers and nut was obtained. It is proved that the RSM has a low vibroactivity that allows you to create mechatronic actuators, the maximum level of vibration does not exceed 60 to 62 dB, which is 11-16 dB below the level of vibratory activity gear mechanisms IntruductionRecently, planetary roller-screw mechanisms (RSM) have become widely used among executive mechanisms used for converting rotary movement into linear displacement [1][2][3][4][5][6]. In papers [2, 3, 6] we have shown methods for calculating the main technical characteristics of those mechanisms. At the same time, an important actuators characteristic, often determining the applicability of a particular mechanism, is its vibroactivity and, as a result, the noise generated. The screw gear smoothness is the cause of decreased RSM vibroactivity and noise and makes those mechanisms promising for use. As for RSM, the closest analogues for the design models are planetary gear mechanisms [4,5] and rolling bearings [6,7] which vibrational processes have been studied sufficiently. However, the use of calculation procedures developed here and practical recommendations for the RSM vibrations reduction is unjustified, because of the changing characteristics and difference between screw mechanisms [8,9]. Let us consider the mechanism option where the screw-rollers support interface is made with multistart threads and has end-capping geared rims. The mechanism structure (Fig.1) comprises screw 1 installed in bearings fixed in housing 2. On the screw and rollers geared rims 6 were cut. The screw is mating the thread rolls 3 through the thread and through the gear rims 6, and the rollers interact with the nut 4 thread. The casing is fixed to the base 5. The problems solved during RSM vibroactivity study are as follows: determining vibration sources, their frequencies and amplitudes, calculating the forced vibrations spectrum, determining the audio range vibration levels accounted for by the RSM casing. Materials and methodsOut of the many oscillation theory methods, the most suitable method for solving the tasks in hand is the dynamic compliance method. The method is as follows. The mechanism is divided into a number of simple subsystems. As for the RSM the following subsystems are distinguished: screw, rollers, nuts and housing (Fig. 2). 1 -screws and clips; 2 -roller and nuts; 3 -screw and toothed roller in the circuit; 4 -screw-on body X axis; 5 -the screw-on housing axis Y; 6 -the screw-on housing axis Z; 7 -a nut body on X-axis; 8 -a nut body on Y-axis; 9 -key -keyway; 10 -body-reliance on the X axis; 11 -body-reliance on the Y axis; 12 -body-reliance on the Z axis; 13 -body-suppor...

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Section: Intruductionmentioning

confidence: 99%

Section: Intruductionmentioning

confidence: 99%

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Vibration decrease of electromechanical actuators based on roller screw mechanisms

et al. 2017

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“…In recent years, there are many researches on PRSM, which are primarily focused on load distribution [1][2][3], parameter matching [4], friction and wear behaviours [5], axial stiffness [6][7] and kinematic analysis [8][9][10]. Instead, only few publications on the dynamic characteristic of the PRSM are mentioned.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model of Planetary Roller Screw Mechanism with Considering Torsional Degree of Freedom

Wan

et al. 2020

MATEC Web Conf.

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To predict accurately the dynamics performance of planetary roller screw mechanism, it is necessary to establish its streamline and engineering-compliant dynamic model, which is the basis of mechanical design and precision control of the system. In this paper, the relative displacement between roller and ring gear along the line of action is deduced and the relationship between nature frequencies and the number of rollers is discussed. Considering the torsional stiffness of all components and the thread mesh stiffness based on the Hertzian contact theory, the purely torsional model for planetary roller screw mechanism is presented to reveal the natural frequencies and vibration mode characteristics of the system. The results show that the natural properties of undamped system in planetary roller screw mechanism are mainly reflected by two typical vibration modes: rotational mode and roller mode.

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“…The transition to the single-block principle of construction provides an improvement of the drive operation and control, an increased reliability, even during failure of individual elements, a reduction in time and cost to get the object being controlled ready for operation, and a mass large saving, which is reduced not only by a reduction in the mass of the drives themselves, but due to the reduction of auxiliary fixing units and mechanically connected blocks. The use of self-locking actuators ensures a reliable neutralization of the failure effects of locking devices [9][10].…”

Section: Introductionmentioning

confidence: 99%

Control of mechatronic drives considering the type and number of the nonlinearities of a mechanical converter

et al. 2019

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In this article the particularities of the dynamics study of mechatronic drives that operate at low velocities are discussed; the origins of frictional self-exited oscillations to develop an algorithm for non-linearity correction are analyzed; a drive mathematical model and the qualitative picture of the self-exited oscillations regimes were presented for the three cases: a "system with clearance and friction-free"; a system without clearance with "dry friction" and a system with clearance and "dry friction". Therefore, an algorithm to compensate the frictional self-excited oscillations based on the feedback introduction for the sliding velocity of the linear motion output link was proposed.

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Theoretical Study of the Load Distribution on the Threads for Roller Screw Mechanisms of a Friction Type

Cited by 16 publications

References 5 publications

Vibration decrease of electromechanical actuators based on roller screw mechanisms

Vibration decrease of electromechanical actuators based on roller screw mechanisms

Dynamic Model of Planetary Roller Screw Mechanism with Considering Torsional Degree of Freedom

Control of mechatronic drives considering the type and number of the nonlinearities of a mechanical converter

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