BS ISO 6336-3:2019 - Calculation of Load Capacity of Spur and Helical Gears

Calculation of Tooth Bending Strength

The BS ISO 6336-3:2019 standard is an essential document for professionals in the field of mechanical engineering, specifically those working with gear design and analysis. This standard provides a comprehensive methodology for calculating the load capacity of spur and helical gears, focusing on the critical aspect of tooth bending strength. Released on December 15, 2020, this document is a vital resource for ensuring the reliability and efficiency of gear systems.

Key Features

• Standard Number: BS ISO 6336-3:2019
• Pages: 66
• Release Date: December 15, 2020
• ISBN: 978 0 539 16357 5
• Status: Standard

Comprehensive Gear Analysis

This standard is part of a series that provides a detailed framework for the calculation of load capacity in gears. The focus of BS ISO 6336-3:2019 is on the bending strength of gear teeth, a critical factor in the overall performance and durability of gear systems. By adhering to the guidelines set forth in this document, engineers can ensure that their gear designs meet the necessary strength requirements, reducing the risk of failure and extending the lifespan of the gear system.

Why Tooth Bending Strength Matters

Tooth bending strength is a crucial parameter in gear design, as it determines the ability of a gear tooth to withstand the forces applied during operation. Inadequate bending strength can lead to tooth breakage, resulting in costly downtime and repairs. The BS ISO 6336-3:2019 standard provides a reliable method for calculating this strength, allowing engineers to design gears that are both efficient and robust.

Who Should Use This Standard?

This standard is indispensable for mechanical engineers, gear designers, and manufacturers who are involved in the design, analysis, and production of spur and helical gears. It is also a valuable resource for academic institutions and research organizations focused on advancing gear technology.

Benefits of Using BS ISO 6336-3:2019

• Enhanced Reliability: By following the guidelines in this standard, engineers can design gears with improved reliability, reducing the likelihood of unexpected failures.
• Increased Efficiency: Proper calculation of tooth bending strength ensures that gears operate efficiently, minimizing energy loss and maximizing performance.
• Cost Savings: Designing gears with adequate bending strength can prevent costly repairs and downtime, leading to significant cost savings over the lifespan of the gear system.
• Compliance: Adhering to international standards like BS ISO 6336-3:2019 ensures compliance with industry best practices and regulatory requirements.

Structure of the Document

The BS ISO 6336-3:2019 standard is structured to provide clear and concise guidance on the calculation of tooth bending strength. It includes detailed explanations, mathematical formulas, and illustrative examples to aid in the understanding and application of the concepts presented. With 66 pages of in-depth information, this document serves as a comprehensive guide for professionals in the field.

Conclusion

The BS ISO 6336-3:2019 standard is an invaluable tool for anyone involved in the design and analysis of spur and helical gears. By providing a reliable method for calculating tooth bending strength, this standard helps ensure the safety, efficiency, and longevity of gear systems. Whether you are an engineer, designer, or manufacturer, incorporating the guidelines of this standard into your work will enhance the quality and performance of your gear designs.

BS ISO 6336-3:2019

This standard BS ISO 6336-3:2019 Calculation of load capacity of spur and helical gears is classified in these ICS categories:

• 21.200 Gears

This document specifies the fundamental formulae for use in tooth bending stress calculations for involute external or internal spur and helical gears with a rim thickness s_R > 0,5 h_t for external gears and s_R > 1,75 m_n for internal gears. In service, internal gears can experience failure modes other than tooth bending fatigue, i.e. fractures starting at the root diameter and progressing radially outward. This document does not provide adequate safety against failure modes other than tooth bending fatigue. All load influences on the tooth root stress are included in so far as they are the result of loads transmitted by the gears and in so far as they can be evaluated quantitatively.

This document includes procedures based on testing and theoretical studies such as those of Hirt^{[ 11]}, Strasser^{[ 14]} and Brossmann^{[ 10]}. The results are in good agreement with other methods (References [5], [6], [7] and [12]). The given formulae are valid for spur and helical gears with tooth profiles in accordance with the basic rack standardized in ISO 53. They can also be used for teeth conjugate to other basic racks if the virtual contact ratio ?_?n is less than 2,5.

The load capacity determined on the basis of permissible bending stress is termed “tooth bending strength”. The results are in good agreement with other methods for the range, as indicated in the scope of ISO 6336-1.

If this scope does not apply, refer to ISO 6336-1:2019, Clause 4.