scholarly journals Experimental study of the contribution of gear tooth finishing processes to friction noise

2017 ◽  
Vol 115 ◽  
pp. 70-77 ◽  
Author(s):  
S. Jolivet ◽  
S. Mezghani ◽  
M. El Mansori ◽  
R. Vargiolu ◽  
H. Zahouani
Keyword(s):  
Experimental Study ◽  
Gear Tooth ◽  
Friction Noise ◽  
Finishing Processes

scholarly journals Aspects of the Internal Gear Honing Process

2018 ◽  
Vol 70 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Rares Lupas ◽  
Livia Dana Beju
Keyword(s):  
Experimental Study ◽  
Gear Tooth ◽  
Modern Method ◽  
Cylindrical Gears ◽  
Gear Honing ◽  
Geometric Precision ◽  
Surface Precision ◽  
Finishing Processes ◽  
Internal Gear ◽  
State Of Art

Abstract The paper analyzes the process of internal honing of cylindrical gears, a new and modern method of finishing the gear tooth flanks. At the beginning, the kinematics of the process is being analyzed. By realizing the state of art, we were able to identify the main features of the process, its advantages in terms of surface precision and quality, the residual stresses and the wear of the flanks compared with other finishing processes. An experimental study of the geometric precision, the shape of the flanks and the roughness for honed surfaces compared to the unfinished ones, highlighted the value and the need of this process.

Estimation of Gear Friction Coefficient using Directional Parameter of Tooth Surface

2021 ◽  
pp. 1-27
Author(s):  
Junichi Hongu ◽  
Ryohei Horita ◽  
Takao Koide
Keyword(s):  
Friction Coefficient ◽  
Contact Surface ◽  
Gear Tooth ◽  
Correction Term ◽  
Tooth Surface ◽  
Oil Film ◽  
Tooth Surfaces ◽  
Frictional Coefficients ◽  
Finishing Processes ◽  
The Relationship

Abstract This study proposes a modification of the Matsumoto equation using a directional parameter of tooth surfaces to adapt various gear finishing processes. The directional parameters of a contact surface, which affect oil film formations, have been discussed in the field of tribology; but this effect has been undetermined on the meshing gear tooth surfaces having directional machining marks. Thus, this paper investigates the relationship between the gear frictional coefficients and the directional parameters (based on ISO25178) of their tooth surfaces with the various finishing processes; and modifies the Matsumoto equation by introducing a new directional parameter to augment the various gear finishing processes. Our findings indicate that through optimizing the coefficient of the correction term the include the new directional parameter, the calculated friction values using the modified Matsumoto equation correlate more highly to the experimental friction values than that using the unmodified Matsumoto equation.

Theoretic and Experimental Study on the Accuracy of Gears by Generative Electrochemical Mechanical Finishing

2011 ◽  
Vol 487 ◽  
pp. 268-272
Author(s):  
Gui Bing Pang ◽  
D.M. Li ◽  
Wen Ji Xu ◽  
X. Adayi ◽  
L. Yang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gear Tooth ◽  
Dimensional Accuracy ◽  
Thickness Direction ◽  
Gear Teeth ◽  
Cylindrical Gears ◽  
Working Performance

Gears’ accuracy has important influences on its working performance and life. Electrochemical mechanical finishing (ECMF) was applied to finish cylindrical gears. The influence of the generative type of ECMF was studied theoretically and experimentally on the shape of gear teeth, and on the dimensional accuracy between teeth, and that in the tooth thickness direction. The results indicate that the generative type of ECMF can improve the accuracy between teeth, as well, the dimensional accuracy of gear tooth and that in the thickness direction may be also improved.

Properties and performances of fabrics made from bio-based and degradable polylactide acid/poly (hydroxybutyrate- co-hydroxyvalerate) (PLA/PHBV) filament yarns

2016 ◽  
Vol 87 (20) ◽  
pp. 2464-2474 ◽  
Author(s):  
XX Huang ◽  
XM Tao ◽  
ZH Zhang ◽  
P Chen
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Polyamide 6 ◽  
Air Permeability ◽  
Filament Yarn ◽  
Thermal And Mechanical Properties ◽  
Knitted Fabrics ◽  
Polylactide Acid ◽  
Finishing Processes ◽  
Single Jersey

This paper reports a comparative experimental study of single jersey knitted fabrics made from a novel bio-based and degradable polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) multi-filament yarn, together with polylactide acid , Cupro, polyethylene terephthalate (PET) and polyamide 6 (PA 6) multi-filament yarns. Their structures, mechanical, thermal and surface properties and performances as well as anti-bacterial behavior are measured and compared. It has been found that the polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) filament yarn has adequate thermal and mechanical properties for normal textile and coloration/finishing processes. The Young's modulus of polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) multi-filament yarn is the lowest among all the candidates investigated except for polyamide 6 (PA 6). The dyed polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) fabric has the highest softness rating among all the fabrics. Single jersey knitted fabrics from the polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) filament yarn have a bursting strength, extension and recovery that satisfy the industrial requirement. In addition, after fully relaxation, the dyed polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) knitted fabrics exhibit an outstanding pilling resistance, favorable snagging property, as well as good air permeability, Qmax and smoother surface. Finally, this study has led to a discovery of excellent anti-bacterial performance of 100% polylactide acid/poly (hydroxybutyrate-co-hydroxyvalerate) (PLA/PHBV) fabrics against staphylococcus aureus, klebsiella pneumoniae, candida albicans according to AATCC100-2012.

scholarly journals Design and Experimental Study of the Rolling Enhanced Acoustic System for Gear Tooth Surface

2021 ◽  
Author(s):  
Yan Jiang ◽  
Bo Zhao
Keyword(s):  
Residual Stress ◽  
Experimental Study ◽  
Gear Tooth ◽  
Tooth Surface ◽  
Acoustic System ◽  
Innovative Design ◽  
Experimental Platform ◽  
Series Of Experiments ◽  
Working Performance ◽  
Rolling Technology

Abstract Parameters of gear flanks, such as roughness, hardness, and residual stress, impact their working performance. Therefore, it is essential to optimize these parameters for increasing gears’ life. Thus, this study combined the meshing theory and the ultrasonic surface rolling technology, and presented an innovative design to realize ultrasonic burnishing. First，the dimensions of the ultrasonic burnishing device with two nodes integrated with a gear at the bottom were calculated using frequency equations by a numerical method. Second the correctness of the calculating results was verified by simulations and experiments. Third, the influence of the ratio between the width and diameter of the gear on the acoustic system was studied. Finally, experimental platform of the rolling enhanced acoustic system for gear tooth surface is built successfully. A series of experiments were conducted, and the results showed that the roughness decreased and the hardness and the residual stress improved. Therefore, this design provided a new theory and technology to machine complicated surfaces such as gear flanks.

Simulation and Optimization of Gear Form Grinding

2009 ◽  
Author(s):  
Francesco Rosa ◽  
Carlo Gorla
Keyword(s):  
Gear Tooth ◽  
Transmission Error ◽  
Tool Geometry ◽  
Noise Emission ◽  
Good Efficiency ◽  
Simulation And Optimization ◽  
Form Grinding ◽  
Disk Tool ◽  
Tooth Flank ◽  
Finishing Processes

Nowadays, the basic requirements of gear transmissions are not limited only to the more usual ones (like resistance, reliability ...), but often include also good efficiency and low vibration and noise emissions. Supporting structures, gear macro and micro geometry and textures are the key-points in the design of a geared system that fulfil the latter two requirements. The expected results can be obtained only if the gears actually meet the design specifications: this is one of the main reasons for the improvement and the optimization of the finishing processes, like shaving and grinding. A great deal of work has been done on defining the gear tooth flank topology that minimizes gear transmission error and consequently its noise emission, but usually, the practical realization of this micro-geometry is not taken into account. The actually available axes of the grinding machines and their laws of motion limit, in fact, the obtainable flank topology, and then it is often difficult to determine the optimal machine tool settings. In the paper, first it is presented a method to simulate gear form grinding with a disk tool; then a strategy to determine the combination of tool geometry and axes’ motions that best fulfil the gear design geometrical requirements is presented and discussed.

Experimental Study on Friction Noise of Dry Rough Surfaces

2008 ◽  
Author(s):  
H. Ben Abdelounis ◽  
A. Le Bot ◽  
H. Zahouani ◽  
J. Perret-Liaudet
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Sound Pressure Level ◽  
Sound Pressure ◽  
Pressure Level ◽  
Light Pressure ◽  
Sliding Speed ◽  
Friction Noise ◽  
Dry Contact ◽  
Flat Contact

This paper presents an experimental study of the friction noise, between two rough and dry surfaces. Two different geometries of contact have been studied: flat-flat contact and sphere-flat contact. The domain of interest is the dry contact under light pressure where the roughness is the dominant cause of noise. In agreement with some other studies, it has been observed that the sound pressure level Lp (dB) is a logarithmic function of the surface roughness and the sliding speed. However, the exponent of the logarithmic law between sound pressure level and surface roughness largely depends on the topography of the sliding surfaces. On the other hand, the exponent of the law between sound pressure level and sliding speed depends on the contact geometry.

Sign in / Sign up

Export Citation Format

Share Document