| Product | Accuracy Grade | Material | Tooth Surface Finish | Reference | | :--- | :--- | :--- | :--- | :--- | | Ground Spur Gear | (JIS B 1702-1:1998) | S45C Equivalent (e.g., EN 1.1191) | Ground | | | General Industrial Spur Gear | JIS N8 Grade (JIS B 1702-1:1998) | S45C Equivalent | Cut | | | General Industrial Spur Gear | JIS N9 Grade (JIS B 1702-1:1998) | CAC702 (Aluminum-Bronze) | Cut | |
For those interested in downloading the Jis B 1702-1 pdf, several online resources are available, including:
When looking through a specification table, a Grade 5 gear under the modern system roughly correlates to a Class 1 or Class 2 gear under the old 1976 system. Always verify the publication year on your engineering blueprints to avoid critical manufacturing errors. Critical Deviations Defined in JIS B 1702-1
The Jis B 1702-1 pdf provides a standardized framework for evaluating the accuracy of gear teeth, ensuring that they meet the required specifications for smooth and efficient operation. By adhering to this standard, manufacturers can: jis b 1702-1 pdf
JIS B 1702-1 is an important standard for gear manufacturers, as it provides a set of guidelines for designing and manufacturing high-quality gears. By following the standard, manufacturers can ensure that their gears meet the required performance and safety standards.
When analyzing a single gear flank using the criteria established in Part 1, the standard outlines three foundational, mandatory measurement elements: 1. Pitch Deviations (Single & Total Accumulated) Single Pitch Deviation ( fptf sub p t end-sub
This applies to the alignment of the tooth along its axis (crucial for helical gears). | Product | Accuracy Grade | Material |
Understanding JIS B 1702-1: The Standard for Gear Accuracy The standard is the primary Japanese Industrial Standard for classifying the accuracy of cylindrical involute gears. Established by the Japanese Standards Association (JSA), it provides the technical definitions and allowable deviation values for tooth flanks, ensuring precision in mechanical systems ranging from heavy industrial machinery to high-precision robotics. Overview of JIS B 1702-1:2016
For helical gears, this measures how much the tooth's lengthwise path (the helix) deviates from its intended path. It's crucial for ensuring even load distribution across the gear's face width.
When you see a gear product listed with a specification like "Accuracy Class JIS N9 (JIS B 1702-1:1998)," it tells you the manufacturer has measured the gear against the defined parameters of the standard and classified it as meeting N9-level precision. A higher grade like N7 indicates a more precise, likely more expensive part, suitable for high-performance applications. A lower grade like N12 is typical for less critical, lower-cost applications. By adhering to this standard, manufacturers can: JIS
JIS B 1702-1:1998 Cylindrical gears -- ISO system of accuracy
JIS B 1702-1 defines .
Once you acquire the official PDF, do not read it cover to cover. Skip to these critical tables:
The standard provides specific formulas to calculate the allowable tolerances for various deviations within these classes.
This standard is widely used across various industries—including automotive, aerospace, general machinery, and robotics—to ensure that gear components perform reliably, run quietly, and have a long operational life. It is the direct Japanese adoption of , which harmonizes Japan's gear standards with international specifications. Understanding and complying with this standard is essential for any engineer, designer, or manufacturer involved in gear production or procurement.