TOPICS CALENDAR BUYER'S GUIDE AGMA

Tooth Root

TECHNICAL ARTICLES | 2022-04-25

Tooth Root Bending Strength of Shot-Peened Gears Made of High-Purity Steels up to the VHCF Range

Standardized methods, like AGMA 2001-D04 or ISO 6336 for the calculation of the load carrying capacities of gears are intentionally conservative to ensure broad applicability in industrial practice. However, new applications and higher requirements often demand more detailed design calculations nowadays; for example: long operating lives in wind power gearboxes or fewer gear stages and higher speeds in e-mobility applications result in higher load cycles per tooth in a gearbox.

TECHNICAL ARTICLES | 2022-02-23

Effect of the ISO 6336-3:2019 Standard Update on the Specified Load Carrying Capacity Against Tooth Root Breakage of Involute Gears

A calculation-based study of different variants with regard to contact ratio and tooth root geometry to compare the results from the 2019 version of ISO 6336 to the previous version, released in 2006.

TECHNICAL ARTICLES | 2021-05-01

Material Properties and Tooth Root Bending Strength of Shot Blasted, Case Carburized Gears with Alternative Microstructures

Selected results of research project concerning the above mentioned material properties and tooth root bending strength.

INDUSTRY NEWS | 2021-02-22

Fatigue Strength and Service Calculation of Gears

Bevel gear design is well-established. Flank geometry optimization is used worldwide to ensure satisfactory low-noise emis...

TECHNICAL ARTICLES | 2019-09-01

A Precise Prediction of the Tooth Root Stresses for Involute External Gears with Any Fillet Geometry under Consideration of the Exact Meshing Condition

This paper shows a method to calculate the occurring tooth root stress for involute, external gears with any form of fillets very precisely within a few seconds.

TECHNICAL ARTICLES | 2017-05-01

Inclusion-Based Bending Strength Calculation of Gears

Reduced component weight and ever-increasing power density require a gear design on the border area of material capacity. In order to exploit the potential offered by modern construction materials, calculation methods for component strength must rely on a deeper understanding of fracture and material mechanics in contrast to empirical-analytical approaches.

TECHNICAL ARTICLES | 2016-11-01

Calculation of the Tooth Root Strength of Worm Wheel Teeth Based on Local Stresses

How local stresses obtained from FEA can be used to determine fatigue strength of worm wheel teeth.

TECHNICAL ARTICLES | 2016-06-01

Worm Gear Efficiency Estimation and Optimization

This paper outlines the comparison of efficiencies for worm gearboxes with a center distance ranging from 28 - 150 mm that have single reduction from 5 to 100:1. Efficiencies are calculated using several standards (AGMA, ISO, DIN, BS) or by methods defined in other bibliographic references. It also deals with the measurement of torque and temperature on a test rig — required for the calibration of an analytical model to predict worm gearbox efficiency and temperature. And finally, there are examples of experimental activity (wear and friction measurements on a blockon- ring tribometer and the measurements of dynamic viscosity) regarding the effort of improving the efficiency for worm gear drivers by adding nanoparticles of fullerene shape to standard PEG lubricant

INDUSTRY NEWS | 2015-04-14

AKGears Unveils Latest Tooth Root Fillet Optimization Software

AKGears recently introduced the only commercially available tooth root fillet optimization software that defines the tooth root fillet pr...

TECHNICAL ARTICLES | 2014-06-01

Calculation of Tooth Root Load Carrying Capacity of Beveloid Gears

In this paper, two developed methods of tooth root load carrying capacity calculations for beveloid gears with parallel axes are presented, in part utilizing WZL software GearGenerator and ZaKo3D. One method calculates the tooth root load-carrying capacity in an FE-based approach. For the other, analytic formulas are employed to calculate the tooth root load-carrying capacity of beveloid gears. To conclude, both methods are applied to a test gear. The methods are compared both to each other and to other tests on beveloid gears with parallel axes in test bench trials.

INDUSTRY NEWS | 2014-05-01

Industry News

The complete Industry News section from the May 2014 issue of Gear Technology.

TECHNICAL ARTICLES | 2013-06-01

Tooth Root Optimization of Powder Metal Gears - Reducing Stress from Bending and Transient Loads

This paper will provide examples of stress levels from conventional root design using a hob and stress levels using an optimized root design that is now possible with PM manufacturing. The paper will also investigate how PM can reduce stresses in the root from transient loads generated by abusive driving.

INDUSTRY NEWS | 2005-04-13

New North American Subsidiary for Atlanta GmbH

Atlanta GmbH in Bietingheim-Bissingen, Germany, announced the formation of its new North American subsidiary, Atlanta Drive Systems Inc.,...

TECHNICAL ARTICLES | 2000-11-01

Design Against Tooth Interior Fatigue Fracture

In a modern truck, the gear teeth are among the most stressed parts. Failure of a tooth will damage the transmission severely. Throughout the years, gear design experience has been gained and collected into standards such as DIN (Ref. 1) or AGMA (Ref. 2). Traditionally two types of failures are considered in gear design: tooth root bending fatigue, and contact fatigue. The demands for lighter and more silent transmissions have given birth to new failure types. One novel failure type, Tooth Interior Fatigue Fracture (TIFF), has previously been described by MackAldener and Olsson (Refs. 3 & 4) and is further explored in this paper.

TECHNICAL ARTICLES | 1988-05-01

Tooth Root Stresses of Spiral Bevel Gears

Service performance and load carrying capacity of bevel gears strongly depend on the size and position of the contact pattern. To provide an optimal contact pattern even under load, the gear design has to consider the relative displacements caused by deflections or thermal expansions expected under service conditions. That means that more or less lengthwise and heightwise crowning has to be applied on the bevel gear teeth.

TECHNICAL ARTICLES | 1985-07-01

Influence of Relative Displacements Between Pinion and Gear on Tooth Root Stresses of Spiral Bevel Gears

The manufacturing quality of spiral bevel gears has achieved a very high standard. Nevertheless, the understanding of the real stress conditions and the influences. of certain parameters is not satisfactory.