Traditional versus improved designs for cycloidal speed reducers with a small tooth difference: The effect on dynamics

Hsieh, Chíu-Fan

doi:10.1016/j.mechmachtheory.2014.11.013

Cited by 50 publications

(31 citation statements)

References 21 publications

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“…Many works have been presented on the subject of the theoretical design of these cycloidal drives [4] [5], designing with machine tolerances [6], contact and stress analysis [7], and performance characteristics such as torque ripple and backlash [8] [9] as will be presented in Section 2. These works lay a solid foundation for a designer, providing the equations and design considerations for a cycloid.…”

Section: Cycloidal Drive Backgroundmentioning

confidence: 99%

Cycloidal Geartrain In-Use Efficiency Study

Farrell¹,

Holley²,

Bluethmann³

et al. 2018

Volume 5B: 42nd Mechanisms and Robotics Conference

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Currently, harmonic drives are the primary speed reducer for robotic applications where a high reduction in a small package is required. Cycloidal drives are an alternative option for high reduction, small package, use-cases with the advantage of a higher specific torque and the ability to customize and integrate the drive for the application. These compact style cycloidal drives have been well studied in theory and simulation for their performance, but very little data is available on their actual performance over time. This paper presents experimental data on performance of a cycloidal drive designed for a Lunar or Martian rover application. Burn-in time efficiency curves and torque/speed efficiency profiles are computed after running the drive through 129k output cycles (7.6M input cycles) over the course of 300+ hours of testing. The study finds that substantial burn-in time may be required for steady-state performance, but peak efficiencies of 81% can be achieved. Also, the efficiency is shown to be dependent on the torque through the actuator. This work demonstrates a customized cycloidal drive in a space application that is comparable to a harmonic drive in efficiency performance, with a 2x increase in specific torque, suggesting the application of cycloidal drives could grow tremendously in robotic designs.

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Section: Cycloidal Drive Backgroundmentioning

confidence: 99%

Cycloidal Geartrain In-Use Efficiency Study

Farrell¹,

Holley²,

Bluethmann³

et al. 2018

Volume 5B: 42nd Mechanisms and Robotics Conference

View full text Add to dashboard Cite

show abstract

“…Furthermore, the system dynamics analysis models of cycloidal speed reducers were developed and the accuracy of performance estimation was verified by experiments [25]. These techniques could be applied to other types of speed reducers including those with a few teeth difference, single-stage, and two-stage designs (such as RV reducer) to identify their shortcomings and advantages [26,27]. Besides, these techniques can also help to develop a new eccentric reducer for increasing the lifetime and lowering the usage cost.…”

Section: Introductionmentioning

confidence: 99%

Performance prediction method of cycloidal speed reducers

Hsieh

Fuentes-Aznar

2019

J Braz. Soc. Mech. Sci. Eng.

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The cycloidal speed reducer is used in industry universally. In order to know the influence of the design parameters on the reducer performance, this study proposes a prediction method which cannot only estimate the stability but also forecast the power loss to identify the performance differences of various designs. The design of reducers in this paper follows non-pin designs so that the transmission uses a cycloidal gear and a cycloid internal gear. Firstly, several design cases considering different number and pitch radii of output rollers are used to explain the prediction method and establish statistical math models in which the data is obtained from the reducer dynamic analysis. Then, the variation coefficient of kinematic and stress data is used to predict the stability (or vibrations risk) and efficiency (or power loss), respectively. The results indicate that the effect of the number of output rollers on the stability is greater than that of the pitch radius of the output rollers. Although increasing the number of output rollers may increase the risk of vibrations, the power loss of the speed reducer can be reduced. Besides, the proposed prediction method can also be applied to reducers with multi-cycloidal gears to investigate how non-pin designs affect their overall performance. The results confirm that the stability and efficiency is reduced significantly when the number of cycloidal gears is greater than two, and in such a case, the design of dual cycloidal gears is the best option.

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“…• kinematic error analysis and tolerance allocation [8], • new modifications of the transmission parts [9], • dynamic performance of modified geometrical design [10], • optimal oil level, lubricator sorts and their impact on the efficiency of the cycloidal transmission, and efficiency calculations considering exploitation and maintenance [9,11], • geometry of the discs and contact forces distribution from the perspective of theoretical efficiency [12].…”

Section: Introductionmentioning

confidence: 99%

Wear Assessment of Sliding Sleeves in a Single-Stage Cycloidal Drive

Żurowski¹,

Olejarczyk²,

Zaręba³

2019

Adv. Sci. Technol. Res. J.

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In the paper, the issue of sliding sleeves wear in a cycloidal transmission was addressed. The working model of a cycloidal drive was constructed and tested in the special rig, and its sleeves underwent detailed analysis afterwards. The sleeves were produced by the sintering technique out of Selfoil bronze with self-lubricating properties. In particular, their surface appearance, weight loss and dimensional changes were assessed; as additionally, the chemical content of the gearbox oil was analyzed. The differences in the sleeves wear were pointed out, related to their positions in the transmission.

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Traditional versus improved designs for cycloidal speed reducers with a small tooth difference: The effect on dynamics

Cited by 50 publications

References 21 publications

Cycloidal Geartrain In-Use Efficiency Study

Cycloidal Geartrain In-Use Efficiency Study

Performance prediction method of cycloidal speed reducers

Wear Assessment of Sliding Sleeves in a Single-Stage Cycloidal Drive

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