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The purpose of this study is to explore the U-shaped relationship between ambidextrous leadership and employee silence by examining power distance orientation as a boundary condition and role stress and relational energy as mediators.

The authors tested the theoretical model with 212 matched samples collected across three-wave-data from 21 companies and branches in China.

Results revealed that ambidextrous leadership showed a U-shaped relationship with employee silence through role stress and relational energy. Moreover, the authors found that the curvilinear relationship was more significant for employees higher in power distance orientation.

Organizations should be aware of the negative side of ambidextrous leadership as well as its stimulation on employee silence. The leaders should pay more attention to subordinates and judge whether they are under too much stress, as well as treat employees more cautiously in both work and non-work situations.

This study provides a first step to the understanding of curvilinear influence of ambidextrous leadership through investigating the mediating effects of role stress and relational energy, and integrating the moderating role of power distance orientation in the process.

The purpose of this paper is to examine the effect of psychological contract breach on destructive by developing a moderated mediation model. The model focuses on the mediating role of moral identity and moral disengagement and the moderating role of moral belief.

This study conducted a three-wave questionnaire survey and used 377 matched-sample data to test the hypotheses. PROCESS bootstrapping program in SPSS and confirmatory factor analysis in AMOS software were adopted in this study.

Results reveal that psychological contract breach has a positive effect on destructive leadership behavior, and the relationship is mediated by moral identity and moral disengagement; moral belief not only moderates the relationship between psychological contract breach and destructive leadership behavior, but also moderates the mediation effect of moral identity and moral disengagement.

First, this study enriches the destructive leadership behavior literature by verifying psychological contract breach as an antecedent. Second, this study discusses the role of morality in the formation mechanism of destructive leadership behavior by testing the mediating effect of moral identity and moral disengagement and the moderating effect of moral belief.

This paper aims to solve the lubrication failures in the turning arm bearing of RV reducer, give some help in perfecting the bearing structure design and provide theoretical basis for the reducer’s performance improvement.

The paper establishes a mixed lubrication analysis model to study performance parameters. According to the discretization of parameters and iteration of equations, numerical simulation and theoretical analysis are achieved in computational process.

Considering influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing, the mixed lubrication analysis model is established to study the ratio of oil film thickness, pressure distribution and maximum von Mises stress in different speeds, temperatures and fillets. The results of mixed lubrication show that reasonable round corner modification, increase in temperature and speed, decrease of surface roughness and lubricant types can improve the lubrication performance.

The mixed lubrication analysis model is established to study the influences of contact load, real rough surface and realistic geometry of RV reducer turning arm roller bearing. Different speed, temperature, lubricant and fillet modification are also considered in the research to analyze oil film thickness, pressure distribution and maximum von Mises stress. These studies can optimize structural design of bearing and direct engineer operations.

The purpose of this paper is to study the elastohydrodynamic lubrication point contact problem with bio-based oil as lubricants for an isothermal case. The simulation of the problem is analyzed on smooth and rough asperity.

The modified Reynolds equation is discretized using finite difference and multigrid method with full approximation scheme (FAS), applied for its solution with varying load and speed.

This paper traces out the comparison of minimum and central film thickness with the standard formulation of Hamrock and Dowson. The effect of longitudinal roughness on surfaces is investigated by means of numerical simulations.

The results obtained are comparable with the standard results, and are shown by graphs and tables. Bio-based products bring out an alternative source of lubricant to reduce energy crises.

The purpose of this study is to systematically analyze the wear of cylindrical needle bearings in rotary vector reducers under temperature rise and identify the influencing factors.

Based on the dynamic characteristics of the RV-20E reducer, the time-varying contact force of the cylindrical needle bearing and the entrainment speed of the inner and outer raceways were calculated. A mixed elastohydrodynamic lubrication model of the needle bearing, considering friction and temperature rise, was established using a dynamic rough tooth surface model. The model solved for the oil film thickness, contact stress and wear conditions of the bearing raceway contact area. The effects of the number of rolling needles, the diameter of rolling needles and surface strength on the wear characteristics were analyzed.

The results of this study show that the oil film thickness, oil film pressure and surface scratches of cylindrical needle bearings exhibit an uneven, patchy distribution under the combined effects of friction and temperature rise. When the radius of the rolling needle is less than 1.44 mm, inner ring wear is less than outer ring wear. Conversely, when the radius exceeds 1.44 mm, inner ring wear is greater. The optimal rolling needle radius is 1.6 mm. Increasing the number of rolling needles and enhancing the yield strength of the contact surface significantly extend bearing life.

This study provides valuable recommendations for optimizing bearing structural parameters and material characteristics in the design of rotary vector reducers.

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2024-0242/