A New Design of a Two-Stage Cycloidal Speed Reducer

Blagojević, M; Marjanović, Nenad; Djordjević, Nataša; Stojаnović, Blaža; Disic, A

doi:10.1115/1.4004540

Cited by 88 publications

(47 citation statements)

References 15 publications

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“…Geometric and kinematic properties of cycloidal speed reducers have been described thoroughly in the literature [8][9][10][11][12][13][14][15]. The stress-strain state of the elements of cycloidal speed reducers has also been analysed, as well as their efficiency [16,17,19].…”

Section: Introductionmentioning

confidence: 99%

“…A two-stage cycloidal speed reducer of a new design concept ( Fig. 1) was developed and presented in the papers [19,25]. While the cycloidal speed reducer of a traditional concept engages two cycloid discs mutually turned by an angle of 180° (in order to balance the dynamic forces) for each stage, the newly developed cycloidal speed reducer uses only one cycloid disc for each stage (with cycloid discs of both stages also mutually turned by 180°).…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Behaviour of a Two-Stage Cycloidal Speed Reducer of a New Design Concept

2018

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Traditional cycloidal speed reducers (with two cycloid discs per one stage, mutually turned by an angle of 180°) are well known for their remarkable dynamic stability. This paper analyses dynamic behaviour of a two-stage cycloidal speed reducer of a new concept, in which only one cycloid disc is used for each stage in order to further enhance its compactness. Lagrange's displacement equations have been used to develop independent dynamic models for both the first and the second stage (six degrees of displacement freedom for the first stage, and eight degrees of displacement freedom for the second stage). A normal force acting at the contact of the cycloid disc teeth and the corresponding ring gear roller has been taken as an excitation force. For the newly designed two-stage cycloidal speed reducer, systems of differential displacement equations of the first and second stage have been solved using the Matlab -Simulink software package. A comprehensive analysis of the obtained diagrams of elastic dynamic contact forces of the first and second stage has revealed a certain analogy. In terms of dynamics, the cycloid disc of the second stage behaves similarly to the cycloid disc of the first stage. Since these cycloid discs are mutually turned by an angle of 180°, it can be concluded that from the aspect of the cycloid disc load, the two-stage cycloidal speed reducer of a new design concept exhibits good dynamic balance and stability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Behaviour of a Two-Stage Cycloidal Speed Reducer of a New Design Concept

2018

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“…The empirical equation relating to machining tolerance with backlash and effective torque ripple was presented in [4] and a mathematical model that includes kinematics parameters and machining step to output moment calculations compared with experimental data was studied in [5]. Propositions of a cycloid generation with the elimination of lobes undercutting was proposed at [6][7][8][9][10][11]. There is also some work dedicated to the power loss and efficiency calculation [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental vibration test of the cycloidal gearbox with different working conditions

Wikło¹,

Olejarczyk²,

Kołodziejczyk³

et al. 2017

Vib. proced.

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Abstract. The article undertakes the problem of vibrations induced in the cycloidal gearbox. The gearbox was calculated, designed and tested by the article authors. To perform the test a testing bench was built. The bench includes electric motors, torque meters and application to control working parameters. The input engine works at constant velocity mode and the braking unit with constant torque mode. The test was made for different configuration of working parameters.

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“…Another approach for load analysis of the cycloid gear drives is the finite element method (FEM). It is the mostly applied method and can be found in some of the research papers, for example, Blagojevic et al (2011), Kim et al (2009), Li (2014) and Thube and Bobak (2012). However, the simulated results of the shared load and contact stress are strongly affected by the accuracy and the configuration of the element meshing because of the multiple contact tooth pairs.…”

Section: Introductionmentioning

confidence: 99%

A study on loaded tooth contact analysis of a cycloid planetary gear reducer considering friction and bearing roller stiffness

Huang

Tsai

2017

JAMDSM

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The cycloid planetary gear drives designed in the so-called RV-type play an important role in precision power transmission. Not only the high reduction ratio, but also the shock absorbability is the significant advantage. However, the load analysis of such the drive is complicated, because the contact problem of the multiple tooth pairs is statically indeterminate. The aim of the paper is thus to propose a computerized approach of loaded tooth contact analysis (LTCA) based on the influence coefficient method, either for the contact tooth pairs of the involute stage or of the cycloid stage. The contact points are determined based on the instant center of velocity in the model. On the other hand, the shared loads of multiple contact tooth pairs are calculated numerically with a set of equations according to the relations of deformation-displacement and load equilibrium. The coupled influences of the loads acting on the involute and the cycloid tooth pairs are also analyzed considering the friction on the contact tooth flanks as well as the stiffness of the supporting bearings for the cycloid discs. With an industrial example, the contact pattern with distributed contact stresses and the shared load of each contact tooth pair during operation are simulated with aid of the proposed approach. The transmitted torques on the crankshaft, the displacements of the main components and the efficiency of each stage calculated accordingly are also illustrated in the paper.

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A New Design of a Two-Stage Cycloidal Speed Reducer

Cited by 88 publications

References 15 publications

Dynamic Behaviour of a Two-Stage Cycloidal Speed Reducer of a New Design Concept

Dynamic Behaviour of a Two-Stage Cycloidal Speed Reducer of a New Design Concept

Experimental vibration test of the cycloidal gearbox with different working conditions

A study on loaded tooth contact analysis of a cycloid planetary gear reducer considering friction and bearing roller stiffness

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