scholarly journals Study on the Virtual Test for Reliability for Contact Stress of Gear Tooth Face

2012 ◽  
Author(s):  
Yanyan Shi ◽  
Haochuan Li ◽  
Ge Zang ◽  
Shuangfeng Wu ◽  
Shi Ji
Keyword(s):  
Contact Stress ◽  
Gear Tooth ◽  
Virtual Test

Dynamic Analysis of Gear Mesh for Gear Pump Based on ANSYS Workbench

2013 ◽  
Vol 706-708 ◽  
pp. 1290-1293 ◽  
Author(s):  
Lei Zhao ◽  
Qing Qing Lv ◽  
Li Quan Yang
Keyword(s):  
Contact Stress ◽  
Gear Tooth ◽  
Corrosion Damage ◽  
Structure Design ◽  
Gear Pump ◽  
Three Dimension ◽  
Tooth Contact ◽  
Gear Teeth ◽  
Gear Mesh ◽  
Ansys Workbench

Based on the FEA software ANSYS Workbench, the soft body dynamics performance of the gear pump gear mesh of a hydraulic pump company was analyzed. In the practical engineering applications, gear pump gear teeth are effected by alternating pressure in the two working cavity. It can cause pitting corrosion damage for gear tooth, and even cause tooth crack and fracture. At first, a three dimension finite element models of the gear pump gear teeth was established. In the start-up process, the gear pump tooth mesh deputy of tooth contact stress strain and dynamic characteristics of gear teeth was analyzed. Obtain the velocity curves, acceleration curve and tooth contact stress and strain dynamic curves of the tooth of gear pump. Providing a new analysis method for gear pump of gear Structure design and having a practical application value.

Study on Analysis of Certain Artillery’s Planetary Transmission Design Based on ANSYS

2014 ◽  
Vol 940 ◽  
pp. 108-111
Author(s):  
Ren Bin Zhou ◽  
Xue Bing Liao ◽  
Jie Min Yang ◽  
Yong Feng Zhang
Keyword(s):  
Contact Stress ◽  
Design Method ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Direct Proportion ◽  
General Design ◽  
Transmission Design ◽  
Planetary Transmission ◽  
Gear Wheels

When designing certain artillery’s planetary transmission of fluid gearbox, it is hard to calculate by general design method, because the plant frame is abnormity three-dimensional entity, and the plants distortion affects the contact stress of joggled gear tooth. In this paper, by the APDL language programmer, the three-dimensional entity of certain artillery’s planetary transmission is established; the finite three-dimensional contact is analyzed by ANSYS; the plants distortion affects is discussed by the choice of the constant FTOLN and FKN, the influence is analyzed that the plant frame’s distortion to the stress of joggled gear wheels, as a result, the planet frame’s transmutation quantity is direct proportion with the gear wheel’s most joggled stress by ANSYS.

Mathematical models of hobs for conjugate-curve gears having three contact points

2014 ◽  
Vol 229 (13) ◽  
pp. 2402-2411 ◽  
Author(s):  
Yan’e Gao ◽  
Bingkui Chen ◽  
Dong Liang
Keyword(s):  
Mathematical Models ◽  
Contact Stress ◽  
Gear Tooth ◽  
Load Capacity ◽  
Point Contact ◽  
Curvature Radius ◽  
Circular Arc ◽  
Normal Section ◽  
Contact Points ◽  
Tooth Surfaces

Conjugate-curve gears are the gears which are point contact and the locus curves of the contact points are conjugate curves. The contact pattern of the conjugate-curve gear tooth surfaces are convex to concave, which reduces the contact stress of the tooth surfaces due to the small value of the relative curvature radius at the contact point. The tubular tooth surfaces of the conjugate-curve gears have one pair of conjugate curves. To decrease the running-in time and increase the load capacity, the conjugate-curve gears having three pairs of conjugate curves are designed. The contact stress of the tooth surfaces having three contact points is much smaller than that of the tubular tooth surfaces in the computer contact analysis. For the further study of the performance of the conjugate-curves gears having three contact points, hobs are considered to manufacture the gears. Two mismatched rack cutters having three contact points are applied for the design of hobs. The working edge in the normal section profile of the rack cutter for the hob generating the pinion is a circular arc and the working edges in the normal section of the rack cutter for the hob generating the gear are two parabolic curves that are tangent to the convex circular arc. By applying the designed rack cutter profiles, the principle of coordinate transformation, the differential geometry theory, and the theory of gearing, mathematical models of the hobs are established. To verify the proposed tooth profile and the hobs, the experimental cutting trials and the load capacity test are carried out. The final accuracy of the gear satisfies the design requirements. The results demonstrate the feasible of the proposed design method.

scholarly journals Influence of Optimal Tooth Modifications on Dynamic Characteristics of a Vehicle Gearbox

2019 ◽  
Vol 16 (1) ◽  
pp. 6319-6331
Author(s):  
Najeeb Ullah ◽  
T. Cong ◽  
B. Huan ◽  
H. Yucheng
Keyword(s):  
Contact Stress ◽  
Gear Tooth ◽  
Transmission Error ◽  
Optimum Level ◽  
Contact Pattern ◽  
Gear Noise ◽  
Tooth Modification ◽  
Proposed Modification ◽  
The Impact ◽  
Central Gear

Considering the practical problems of gear noise and vibration, this work focuses on the gearbox of the electric vehicle as the research object to analyse the impact of gear micro-tooth modification. First of all, the effort centres itself on minimising the contact stress and making the load distribution better by implementing the tooth modification on both upper and central speed phases. The procedural analysis of gear tooth modification is executed to make the contact pattern better, so edge contact has been avoided and the load is distributed over a wide area of the tooth for both upper and central gear sets. The contact pattern is positioned in the centre of teeth and contact stress is lowered by 20% to 837 MPA. Then, the peak to peak transmission error is decreased under three proposed modification approaches. Also, contact and bending safety factors are improved as a result of tooth modification. Meanwhile, it was noticed by performing dynamic analysis that right bearings of both upper and central phases have a higher radial response for first two orders which is further decreased to an optimum level as a result of micro-tooth modification strategies.

Influence of Linear Profile Modification and Loading Conditions on The Dynamic Tooth Load and Stress of High-Contact-Ratio Spur Gears

1991 ◽  
Vol 113 (4) ◽  
pp. 473-480 ◽  
Author(s):  
Chinwai Lee ◽  
Hsiang Hsi Lin ◽  
Fred B. Oswald ◽  
Dennis P. Townsend
Keyword(s):  
Computer Simulation ◽  
Contact Stress ◽  
Dynamic Load ◽  
Applied Load ◽  
Gear Tooth ◽  
Load Force ◽  
Loading Conditions ◽  
Contact Ratio ◽  
Profile Modification ◽  
Root Stress

This paper presents a computer simulation for the dynamic response of high-contact-ratio spur gear transmissions. High contact ratio gears have the potential to produce lower dynamic tooth loads and minimum root stress but they can be sensitive to tooth profile errors. The analysis presented in this paper examines various profile modifications under realistic loading conditions. The effect of these modifications on the dynamic load (force) between mating gear teeth and the dynamic root stress is presented. Since the contact stress is dependent on the dynamic load, minimizing dynamic loads will also minimize contact stresses. This paper shows that the combination of profile modification and the applied load (torque) carried by a gear system has a significant influence on gear dynamics. The ideal modification at one value of applied load will not be the best solution for a different load. High-contact-ratio gears were found to require less modification than standard low-contact-ratio gears. High-contact-ratio gears are more adversely affected by excess modification than by under modification. In addition, the optimal profile modification required to minimize the dynamic load (hence the contact stress) on a gear tooth differs from the optimal modification required to minimize the dynamic root (bending) stress. Computer simulation can help find the design tradeoffs to determine the best profile modification to satisfy the conflicting constraints of minimizing both the load and root stress in gears which must operate over a range of applied loads.

Influence of Different Gear Generation Methods on Contact Stress Analysis of Spur Bevel Gears in PSD

2013 ◽  
Vol 448-453 ◽  
pp. 3476-3480
Author(s):  
Xin Peng Hu ◽  
Jing Wen Yan ◽  
Yan Liu ◽  
Chao Xu ◽  
Ji Xin Wang
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Contact Stress ◽  
Gear Tooth ◽  
Axial Direction ◽  
Element Model ◽  
Bevel Gears ◽  
Power Split ◽  
Curve Method ◽  
Coarse Meshes

This paper summarizes three methods of gear tooth profile generation. Geometry coordinate positions on their profile are compared. A detailed finite element model of mating gear pairs, containing fine meshes and coarse meshes, is presented. Contact stress analysis of three finite element models are conducted to investigate the influence of different generation methods on contact stress. Then, a spur bevel gears pair in Power Split Device is generated by CATIA Law Curve method, and contact stress under the special operating condition is analyzed. The results show few differences of three methods in geometry coordinate positions and tooth contact stress, and the displacement of spur bevel gear in axial direction may cause uneven stress distribution.

scholarly journals Analytical and Experimental Study of Gear Surface Micropitting Due to Variable Loading

2015 ◽  
Vol 750 ◽  
pp. 96-103 ◽  
Author(s):  
Hui Long ◽  
I.S. Al-Tubi ◽  
M.T.M. Martinze
Keyword(s):  
Wind Turbine ◽  
Contact Stress ◽  
Experimental Testing ◽  
Gear Tooth ◽  
Tooth Surface ◽  
Variable Loading ◽  
Wind Turbine Gearbox ◽  
Load Variation ◽  
Tooth Surfaces ◽  
Thickness Variations

This paper presents an investigation of the effect of load variation on gear tooth surface micropitting, for an application in planet gears in a wind turbine gearbox. To study the effect of load variation, two methods are employed: an experimental testing of gear micropitting under variable loading and a probabilistic analysis of gear contact stress and specific lubricant film thickness variations using the ISO Technical Report ISO/TR 15144-1:2010. The load variation of wind turbine gearbox is derived from SCADA (Supervisory Control and Data Acquisition) data recorded in operation. Both experimental and analytical results show that high levels of contact stress, load variations and repeated load cycles are determinant factors for the initiation and propagation of micropitting of gear tooth surfaces.

Tooth Profile Modifications for Optimum Dynamic Load in Spur Gears Based on Pseudo-Interference Stiffness Estimation Method

2005 ◽  
Author(s):  
Monsak Pimsarn ◽  
Kazem Kazerounian
Keyword(s):  
Contact Stress ◽  
Gear Tooth ◽  
Estimation Method ◽  
Spur Gear ◽  
Rigid Body Dynamics ◽  
Gear System ◽  
Hertzian Contact ◽  
Bending Fatigue ◽  
Gear Mesh ◽  
Hertzian Contact Stress

A systematic methodology combining optimization, three dimensional analytical rigid body dynamics and a novel method, namely, Pseudo-Interference Stiffness Estimation method (PISE) [1]- [2], is proposed to dramatically reduce gear design time and improve the spur gear system dynamic performance. The main aim of this methodology is to search for the pro les of tooth crowning and shaving that eventually lead to the optimum dynamic tooth load in the gear mesh. An example of the detailed design study is numerically investigated. The results show that the dynamic tooth load can be reduced to up to 50 percent of its original value. However, this reduction is only valid at the operating ranges of the design load and design speed. It is also found that the effect of pro le modi cation on the dynamic response of the gear system was mostly observed to be a reduction in the peak dynamic tooth load at the resonance speed. Later, the investigation of gear tooth durability was conducted to validate an improvement of gear life. The rating factors given in AGMA publication, Hertzian contact stress, bending fatigue stress, ash temperature and PV index are employed in gear durability determination. The results show that, with the reduction of 50 percent in dynamic tooth load, the reductions in PV index, bending fatigue, Hertzian contact stress, and ash temperature can be achieved up to 64, 58, 28 and 39 percent, respectively.

scholarly journals Times Three Dimensional Spur Gear Static Contact Investigations Using Finite Element Method

2016 ◽  
Vol 10 (5) ◽  
pp. 145 ◽  
Author(s):  
Ahmed Mohammed Abdelrhman ◽  
Haidar F. AL-Qrimli ◽  
Husam M. Hadi. ◽  
Roaad K. Mohammed ◽  
Hakim S. Sultan
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Element Model ◽  
Spur Gear ◽  
Industrial Applications ◽  
Tooth Surface ◽  
Surface Strength ◽  
Static Contact

<p>A gear is a critical component and can be found in many industrial applications. This investigation develops a three dimensional finite element spur gear model to calculate the contact stress on the gear tooth surfaces. Contact stress is one of the main factors that is used to decide the gears tooth surface strength. In addition there are other important factors such as frictional forces and micro-pits that influence the gear tooth surface. Different analytical techniques have been used to calculate the contact stress of the gear surfaces namely; Hertzian theory and AGMA standards. The analytical results have been compared to the numerical analysis to verify the spur gear finite element model.</p>

Fatigue and Life Prediction

2005 ◽  
pp. 293-309
Keyword(s):  
Fatigue Life ◽  
Stress Analysis ◽  
Fatigue Failure ◽  
Contact Stress ◽  
Life Prediction ◽  
Gear Tooth ◽  
Gear Train ◽  
Tooth Surface ◽  
Bending Stress ◽  
Surface Durability

Abstract This chapter summarizes the various kinds of gear wear and failure and how gear life in service is estimated and discusses the kinds of flaws in material that may lead to premature gear fatigue failure. The topics covered are alignment, gear tooth, surface durability and breakage of gear tooth, life determined by contact stress and bending stress, analysis of gear tooth failure by breakage after pitting, and metallurgical flaws that reduce the life of gears. The chapter briefly reviews some components in the design and structure of each gear and/or gear train that must be considered in conjunction with the teeth to enhance fatigue life.

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