High-Pressure Angle Gears: Comparison to Typical Gear Designs

Handschuh, Robert F.; Zakrajsek, Andrew J.

doi:10.1115/1.4004458

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…The value of this angle influences the generated internal stresses [18]. Gears with a large pressure angle are used in the aerospace industry [19] and show high bending strength of the tooth at the base. Gears with a small pressure angle are characterized by a quiet operation and a high contact ratio [20].…”

Section: Figurementioning

confidence: 99%

Preliminary issues in the reverse engineering of an spur gear with non-standard geometric parameters

Konecki

Wojtkowiak

Talaśka

2022

Preprint

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The paper presents issues related to an attempt to recreate the geometry of an involute spur gear with non-standard geometric parameters such as: module m = 4.98 mm, radial clearance factor c* = 0.383, addendum modification y = 0.795, profile shift x = 0.0695, profile angle α = 26.325° and with straight teeth, made in the 6 degree IT, using conventional techniques and measuring instruments. In the process of recreating the geometry of the tested gear, a completely different set of parameters was obtained: m = 5 mm, c* = 0.418, y = 0.81, x = 0.0143, α = 26.806°. The correctness of the reconstructed geometry was assessed by comparing the position of the contour of the involute of the nominal gear with the contour of the involute of the reconstructed gear, establishing that the error value ∆e along the radius leading tangent to the base circle of the restored gear was 0.0054 mm. However, the most important stage of this work is to demonstrate that two involute gears with straight teeth can be identical despite using different geometric parameters in most of them (including, in particular, different modules m and different nominal profile angles α). A formula was derived to calculate the exact value of the profile shift for a new, alternative set of geometric parameters with a different module. A matrix was developed that allows making calculations to derive two identical gears with alternative sets of geometric parameters. Therefore, a proper and valid alternative set of geometric parameters was adopted for the reproduced gear for which the modulus was m = 5 mm, together with c* = 0.380, y = 0.793, x = 0.0325, α = 26.784°. The paper also outlines further research plans.

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Section: Figurementioning

confidence: 99%

Preliminary issues in the reverse engineering of an spur gear with non-standard geometric parameters

Konecki

Wojtkowiak

Talaśka

2022

Preprint

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“…If speed ratio is not specified, the lowest speed ratio is advisable to reduce the maximum fillet stress. Robert F. Handschuh et, al., [19] examined high-pressure angle gearing for possible use in space mechanism applications. Tests were conducted in the NASA GRC Spur Gear Test Facility for 3.18 module (8-diametral pitch), 28 tooth, 20-degree pressure angle gear, 2.12 module (12-diametral pitch), 42 tooth, 25-degree pressure and 1.59 module (16diametral pitch), 56 tooth, 35-degree pressure angle gears were tested.…”

Section: Literature Reviewmentioning

confidence: 99%

A Review on Bending Strength of Asymmetric Gear

G¹

2021

IJRASET

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Gear is a mechanical rotating toothed part which meshes with other similar toothed parts to transmit torque and power. Gear tends to play a very vital role in all industries. This article reviews the methodology used to investigate bending strength of asymmetric spur gear; Finite Element Method (FEM), Numerical Calculation and Investigational Techniques were usually carried out in order to understand the bending strength of spur gear. Works and experiment from the literature were studied, and their findings were extracted to understand the methods used. Next stage is to simulate the gear using Finite Element Method (FEM) in order to get the analysis of gear strength. The most important stage is to put the gears to physical experiment or testing facilities to determine and validate all data from the numerical calculation and FEM method. Therefore, this review article highlights importance of asymmetric gear in chronological order so that reader may obtain an overview of contribution of various researchers in development of gears having least bending stress. Keywords: Symmetric gear, Asymmetric gear, Bending stress and FEM.

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“…The first trend refers to the optimization around the involute curve focusing on the selection of its optimal parameters or the introduction of optimal profile modifications (i.e., tip and root reliefs). The main objectives of the optimization are the minimization of the weight and the volume of the gears [6][7][8], the increase of their efficiency and load capacity [9][10][11] and the improvement of their dynamic and NVH characteristics (mainly through optimal profile modifications) [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Development of a free-form tooth flank optimization method to improve pitting resistance of spur gears

et al. 2022

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Although steel involute gears are the standard solution for gear transmissions, they tend to suffer from poor pitting resistance. Pitting typically occurs when the gear tooth flanks have high equivalent curvature at the contact point and/or when the equivalent curvature is not constant across the contact path leading to high contact pressures and the development of surface fatigue. In this paper a new optimization method is presented to produce spur gear tooth flanks with improved pitting performance compared to involute ones. The tooth flanks are represented as B-spline curves, the control points of which are the variables for the optimization problem. The constraints were designed to ensure that all the examined profiles satisfy the law of gearing and do not contain any cusps or C1 discontinuities. Deterministic and stochastic algorithms were implemented and both closed and open path of contact gear sets were examined to determine the optimum tooth profile. The optimization results show that the maximum equivalent curvature of the optimum profiles is reduced by 83% compared to the corresponding standard profiles, while the deviation from the mean value is reduced by 98%. Both the standard and the optimized gears where examined comparatively also through finite element analysis. For the case selected the maximum contact pressure developed on the optimized gear set was 77% of the respective maximum contact pressure on the standard gear set whereas the corresponding deviation from the mean value was 5%. At the same time, the bending stresses developed in the optimized gear are slightly lower than those in the standard one.

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High-Pressure Angle Gears: Comparison to Typical Gear Designs

Cited by 11 publications

References 2 publications

Preliminary issues in the reverse engineering of an spur gear with non-standard geometric parameters

Preliminary issues in the reverse engineering of an spur gear with non-standard geometric parameters

A Review on Bending Strength of Asymmetric Gear

Development of a free-form tooth flank optimization method to improve pitting resistance of spur gears

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