Optimization Design of RV Reducer Crankshaft Bearing

Huang, Jian; Li, Chaoyang; Chen, Bingkui

doi:10.3390/app10186520

Cited by 11 publications

(8 citation statements)

References 29 publications

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“…Based on the structural parameters of the RV reducer and the force equilibrium, F can be expressed as follows, and the detailed calculation process can be seen in [ 23 ].

…”

Section: Methodsmentioning

confidence: 99%

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An Investigation of the Contact Fatigue Characteristics of an RV Reducer Crankshaft, Considering the Hardness Gradients and Initial Residual Stress

Shao

Tang

et al. 2022

Materials

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The crankshaft is one of the core components of a Rotate Vector (RV) reducer. The fatigue life of the RV reducer is severely hindered by fatigue failure on the eccentric cylindrical surface of the crankshaft. The hardness gradients and residual stress in the crankshaft, associated with machining operations, exert an enormous impact on the rolling contact fatigue (RCF). In this work, a finite element method (FEM)-based three-dimensional elasto-plastic contact model is established to calculate the stress–strain field by taking hardness gradients and initial residual stress into account. The RCF characteristics of an RV reducer crankshaft is investigated by applying modified Fatemi–Socie (FS) multiaxial fatigue criterion. The results indicate that initial residual stress plays an influential role in the fatigue damage by altering the distribution of the maximum normal stress near the contact surface. The modified FS fatigue criterion could better consider the effect of initial residual stress and the shear stress, which significantly improves the prediction accuracy of the contact fatigue life model. The contact fatigue performance could be considerably improved by designing appropriate shot peening parameters to obtain optimized residual stress distribution. Therefore, the technique presented may serve as an important guideline for the anti-fatigue design of an RV reducer crankshaft.

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“…Based on the structural parameters of the RV reducer and the force equilibrium, F can be expressed as follows, and the detailed calculation process can be seen in [ 23 ].

…”

Section: Methodsmentioning

confidence: 99%

“…The load fluctuation of three cylindrical roller bearings in the same cycloid gear are found to have a phase difference of 120°. According to Harris et al [ 24 ], the equivalent load of cylindrical roller bearings can be calculated as [ 23 ]:

…”

Section: Methodsmentioning

confidence: 99%

An Investigation of the Contact Fatigue Characteristics of an RV Reducer Crankshaft, Considering the Hardness Gradients and Initial Residual Stress

Shao

Tang

et al. 2022

Materials

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“…The authors analyzed the effect of design parameters on performance and solved and obtained the Pareto optimal solution. Huang et al (2020) developed an optimization design for RV reducer crankshaft bearing by taking the bearing fatigue life as a goal. Moreover, they analyzed the parameters regarding the bearing geometry and the profile of the inside crowned roller.…”

Section: Multi-objective Optimized Design For Modified Cycloid-pin Ge...mentioning

confidence: 99%

Multi-objective optimized design for modified cycloid-pin gear drive mechanism based on load-bearing capacity

GAO,

ZHANG,

et al. 2024

JAMDSM

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Rotate vector (RV) reducers are typical deceleration elements that moderate and increase torsion. They are widely applied in industrial robots and automatic machinery with the superiorities of compact structure, high precision, and overload resistance performance. However, the RV reducers also have disadvantages, such as low bearing capacity and short service life. As the core drive mechanism in an RV reducer, the bearing capacity for a cycloid-pin gear drive system directly affects the performance of the entire deceleration system. Therefore, the bearing capacity of an RV reducer should be improved by increasing the capacity of a cycloid-pin gear. In this paper, the design of a cycloid-pin gear is optimized to improve its bearing capacity. The tooth profile equations for cycloid gear and the meshing gap are derived based on the gear meshing principle. The bearing capacity for cycloid-pin gear is modeled by combining the contact strength theory with the multi-tooth contact bearing analysis. The effects of eccentricity, the radius of pin tooth distribution circle, pin teeth number, pin tooth radius, cycloid thickness, modification value of moved distance and equidistance on total volume, contact stress, and torsional stiffness are systematically researched. Then, a single-, double-, and three-objective optimization model is proposed based on the load-bearing capacity for cycloid-pin gear by taking these three factors as the objective function. Moreover, the parameters are optimized with the genetic algorithm, and the analyses for three optimizations are compared and discussed. The theoretical models are confirmed by the simulation analysis through ANSYS software. The results show that the bearing capacity for the cycloid-pin gear system can be largely enhanced after optimization.

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“…Scholars have done a lot of research on RV reducers, the most important research contents are as follows: the tooth profile modification optimization of the cycloidal gear of the reducer, 14–17 the finite element analysis of the dynamic performance, 18–20 and the development of the new type structural reducer. 21–23 Li et al 24 proposed a meshing contact analysis approach for RV cycloidal-pin gear transmission using the RV cycloidal-pin gear pair transmission as an example.…”

Section: Introductionmentioning

confidence: 99%

“…It is necessary to systematically study its transmission structure, vibration characteristics, and process optimization design, and carry out vibration tests, providing important guidance and practical value for engineering applications. [10][11][12][13] Scholars have done a lot of research on RV reducers, the most important research contents are as follows: the tooth profile modification optimization of the cycloidal gear of the reducer, [14][15][16][17] the finite element analysis of the dynamic performance, [18][19][20] and the development of the new type structural reducer. [21][22][23] Li et al 24 proposed a meshing contact analysis approach for RV cycloidal-pin gear transmission using the RV cycloidal-pin gear pair transmission as an example.…”

Section: Introductionmentioning

confidence: 99%

Analysis and experimental study on vibration characteristics of the RV reducer

Wang

Fang

et al. 2023

Advances in Mechanical Engineering

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RV reducers are commonly employed in precision transmissions, such as robot joints, owing to their multi-tooth contact characteristics, strong impact resistance, and low backlash. A finite element modal analysis of the RV reducer was conducted in this study to reduce the influence of RV vibration on the transmission performance and improve its transmission characteristics. The transmission characteristics are analyzed according to the transmission characteristics and principles. Combined with the theoretical basis of modal analysis, the finite element analysis method was used to analyze the main transmission components, and the natural frequencies and vibration modes of each main component were obtained. A modal analysis of the input shaft and cycloidal gear was performed, and the natural frequencies and vibration modes were obtained. The vibration patterns of the RV reducer, as well as the input shaft and cycloidal gear, were analyzed comprehensively. The distribution of each order frequency and deformation of the components can be determined by analyzing the frequency and array distribution of the components. An RV reducer transmission performance test platform was established to verify the accuracy of the simulation. Vibration signals under three different working conditions were collected, and the accuracy of the simulation was verified by analyzing the frequency signal, which provided important guidance for the design and optimization of the subsequent RV reducer.

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Optimization Design of RV Reducer Crankshaft Bearing

Cited by 11 publications

References 29 publications

An Investigation of the Contact Fatigue Characteristics of an RV Reducer Crankshaft, Considering the Hardness Gradients and Initial Residual Stress

An Investigation of the Contact Fatigue Characteristics of an RV Reducer Crankshaft, Considering the Hardness Gradients and Initial Residual Stress

Multi-objective optimized design for modified cycloid-pin gear drive mechanism based on load-bearing capacity

Analysis and experimental study on vibration characteristics of the RV reducer

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