Development of a Modeling System for Involute Spur Gears Considering Backlash, Profile Modification, and Crowning

The tooth profile modification can generally choose straight line modification, parabolic modification and arc modification. In order to accurately determine the tooth profile modification curves, basing on analysis of the vibration that effected by transmission error, a pair of gears meshing process is simulated with FEM approach. Aiming at reducing the fluctuation of transmission error, the transmission error curves of straight line modification, parabolic modification and arc modification with the same modification parameters are plotted, and the best modifications curve is obtained. The research shows that the approach is accurate to choose the best modification curve, and reduce the fluctuation of transmission error greatly. The approach illustrated in this paper provides a new way for designing the noiseless gears.

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Effect of profile modification on the performance of spur gears in isothermal mixed-EHL regime using load-sharing concept

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650118806802 ◽

2018 ◽

Vol 233 (6) ◽

pp. 936-948 ◽

Cited By ~ 1

Author(s):

Masoud Kimiaei ◽

Saleh Akbarzadeh

Keyword(s):

Wear Rate ◽

Power Transmission ◽

Elastohydrodynamic Lubrication ◽

Load Sharing ◽

Spur Gears ◽

Gear Teeth ◽

Profile Modification ◽

Model Based ◽

Mechanical Element ◽

The Cost

Spur gears are one of the most important tools for power transmission in the industry and thus can be considered a key mechanical element. As a result of power transmission, gears might fail or experience wear and fatigue. So the improvement in the design and modification of tooth profile of gears can significantly reduce friction loss and wear of the gear teeth and therefore it increases the useful life, improves the quality, and reduces the cost. The purpose of this study is to show the influence of addendum modification on the tribological performance of spur gears which are operating in the mixed elastohydrodynamic lubrication. In this paper, a model based on the load-sharing concept is employed to study the effect of changing addendum modification on the performance of spur gears, the amount of wear rate, and the lubricant film thickness. To this end, a model based on the load-sharing concept is employed which takes the geometry and lubricant properties as input and predicts the friction coefficient, load carried by fluid film and asperities, efficiency, and wear rate as output.

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Tooth Load Sharing in High-Contact Ratio Spur Gears

Journal of Mechanisms Transmissions and Automation in Design ◽

10.1115/1.3258674 ◽

1985 ◽

Vol 107 (1) ◽

pp. 11-16 ◽

Cited By ~ 21

Author(s):

A. H. Elkholy

Keyword(s):

Contact Stress ◽

Applied Load ◽

Normal Load ◽

Closed Form Solution ◽

Load Sharing ◽

Form Solution ◽

Spur Gears ◽

Contact Ratio ◽

Profile Modification ◽

The Individual

A closed-form solution is presented for calculating the load sharing among meshing teeth in high contact ratio gearing (HCRG). The procedure is based upon the assumption that the sum of the tooth deflection, profile modification and spacing error at each of two or three pairs of contacts are all equal. It is also assumed that the sum of the normal loads contributed by each of two or three pairs of contacts is equal to the maximum normal load. Once the individual loads are determined, the tooth fillet stress, contact stress may be determined from the applied load and tooth geometry. An experimental example appears to verify the method.

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