Results 241 to 250 of about 23,834 (285)
Some of the next articles are maybe not open access.
Churning power loss of the intermediate gearbox in a helicopter under splash lubrication
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2021Based on computational fluid dynamics, a two-phase flow model was established to calculate the churning power loss of the spiral bevel gears under splash lubrication. The error between the simulation results and experiment results is only 7.04%. Taking a certain helicopter as an example, the churning power loss of the intermediate gearbox is ∼2.6051 ...
Fengxia Lu +4 more
openaire +1 more source
An experimental investigation of windage and oil churning power losses of gears and discs
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2022This study presents comparable sets of churning and windage power loss measurements of a gear. Measurements are performed under windage (air only) and churning (immersion in oil up to a certain level) to quantify load-independent power losses of a family of spur and helical gears along with representative discs.
M Handschuh, A Guner, A Kahraman
openaire +1 more source
Churning power losses of a gearbox with spiral bevel geared transmission
Tribology International, 2019Abstract To predict the churning power losses in a gearbox with spiral bevel geared transmission, based on the Computational Fluid Dynamics (CFD) method, a numerical simulation model for the splash lubrication of the intermediate gearbox of a helicopter including gear box housing, a spiral bevel gear pair and an oil guide device is established and ...
Xiaozhou Hu +4 more
openaire +1 more source
Oil Churning Power Losses of a Gear Pair: Experiments and Model Validation
Journal of Tribology, 2009This paper presents the results of an experimental study on load-independent (spin) power losses of spur gear pairs operating under dip-lubricated conditions. The experiments were performed over a wide range of operating speed, temperature, oil levels, and key gear design parameters to quantify their influence on spin power losses.
S. Seetharaman +3 more
openaire +1 more source
Materials Today: Proceedings, 2020
Abstract Worm gears have very high total power losses due to high sliding motion and strong reduction ratio resulting in low efficiency. It is currently assumed that the total power loss (TPL) is caused by the load dependent losses; it is not caused by any non-load dependent losses.
Hardik G. Chothani, Kalpesh D. Maniya
openaire +1 more source
Abstract Worm gears have very high total power losses due to high sliding motion and strong reduction ratio resulting in low efficiency. It is currently assumed that the total power loss (TPL) is caused by the load dependent losses; it is not caused by any non-load dependent losses.
Hardik G. Chothani, Kalpesh D. Maniya
openaire +1 more source
Numerical Modeling of Churning Power Loss of Gear System Based on Moving Particle Method
Tribology Transactions, 2019Churning power losses are an important portion of transmission load-independent power losses, especially in high-speed condition and dip-lubricated gearboxes with high immersion depth.
Dong Guo +4 more
openaire +1 more source
Tribology International, 2021
Abstract To study the influence of dynamic flight attitudes on the splash lubrication performance and churning power losses of the intermediate spiral bevel gearbox in a helicopter, a three-dimensional (3D) simulation model consisting of a spiral bevel gear pair, two bearing caps with oil guide holes and the housing is established, and CFD ...
Xiaozhou Hu +3 more
openaire +1 more source
Abstract To study the influence of dynamic flight attitudes on the splash lubrication performance and churning power losses of the intermediate spiral bevel gearbox in a helicopter, a three-dimensional (3D) simulation model consisting of a spiral bevel gear pair, two bearing caps with oil guide holes and the housing is established, and CFD ...
Xiaozhou Hu +3 more
openaire +1 more source
Forschung im Ingenieurwesen, 2016
Energy efficiency represents one of the most relevant trends in many fields, including the sector of power transmissions and gears, which are involved whenever power has to transmitted and transformed. For instance, in the automotive industry, gearboxes can contribute to the overall efficiency of the system and promote lower fuel consumption and ...
CONCLI, FRANCO, GORLA, CARLO
openaire +1 more source
Energy efficiency represents one of the most relevant trends in many fields, including the sector of power transmissions and gears, which are involved whenever power has to transmitted and transformed. For instance, in the automotive industry, gearboxes can contribute to the overall efficiency of the system and promote lower fuel consumption and ...
CONCLI, FRANCO, GORLA, CARLO
openaire +1 more source
Development of an analytical model to estimate the churning power losses of a spiral bevel gear
Tribology International, 2020Abstract A quasi-analytical model based on fluid mechanics is established to estimate the no-load power losses of a spiral bevel gear with splash lubrication. The no-load losses are defined as the sum of churning power loses and windage power losses.
Y. Dai, F. Ma, X. Zhu, B. Ouyang
openaire +1 more source
Determination of oil distribution and churning power loss of gearboxes by finite volume CFD method
Tribology International, 2017Abstract Sufficient oil supply of all machine elements in gearboxes is usually required to avoid damage and to reduce friction during operation. However, dip lubrication and injection lubrication always result in hydraulic gear power losses. Especially in high-speed and dip-lubricated gearboxes with high oil levels, churning losses can represent a ...
Hua Liu +3 more
openaire +1 more source