Jis B 1702-1 Pdf Info

Understanding Jis B 1702-1 Pdf: A Comprehensive Guide

Introduction

JIS B 1702-1 is a Japanese Industrial Standard (JIS) that outlines the specifications for spur and helical gears. The standard is divided into multiple parts, with Part 1 covering the basic requirements for spur and helical gears. In this blog post, we will provide an overview of JIS B 1702-1 and explore the contents of the standard.

What is Jis B 1702-1?

JIS B 1702-1 is a standard published by the Japanese Standards Association (JSA) that defines the requirements for spur and helical gears used in various applications, including industrial machinery, automotive, and aerospace. The standard covers the design, manufacturing, and inspection of gears to ensure their quality and performance.

Contents of Jis B 1702-1 Pdf

The JIS B 1702-1 standard covers the following topics:

  1. Scope: The standard applies to spur and helical gears with a pitch circle diameter of up to 1000 mm.
  2. Normative References: The standard references other JIS standards and international standards, such as ISO 1328-1.
  3. Terms and Definitions: The standard defines various terms related to gears, including pitch circle, tooth thickness, and gear ratio.
  4. Gear Tooth Profiles: The standard specifies the gear tooth profiles, including the tooth shape, pressure angle, and gear ratio.
  5. Gear Accuracy: The standard defines the accuracy grades for gears, including the permissible deviations for tooth thickness, pitch, and profile.
  6. Inspection: The standard outlines the inspection methods for gears, including visual inspection, measurement of tooth thickness, and gear tooth profile inspection.

Importance of Jis B 1702-1

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.

Applications of Jis B 1702-1

JIS B 1702-1 is widely used in various industries, including:

  1. Industrial Machinery: Gears are used in industrial machinery, such as conveyor belts, pumps, and gearboxes.
  2. Automotive: Gears are used in vehicles, including transmissions, differentials, and steering systems.
  3. Aerospace: Gears are used in aircraft and spacecraft, including engines, gearboxes, and transmission systems.

Conclusion

JIS B 1702-1 is a comprehensive standard that outlines the requirements for spur and helical gears. By understanding the contents of the standard, gear manufacturers can ensure that their products meet the required performance and safety standards. The standard is widely used in various industries, including industrial machinery, automotive, and aerospace.

Download Jis B 1702-1 Pdf

If you are interested in downloading the JIS B 1702-1 standard, you can visit the Japanese Standards Association (JSA) website or other online platforms that provide access to standards. However, please note that the standard is copyrighted, and you may need to purchase a copy or obtain permission to use it.

Additional Resources

Understanding JIS B 1702-1: The Standard for Gear Accuracy The JIS B 1702-1 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

The current version of this standard is JIS B 1702-1:2016, which officially replaced the older 1998 and 1976 editions. It is largely harmonized with the international standard ISO 1328-1:1995, allowing Japanese manufacturers to maintain global compatibility. Scope and Application

This part of the JIS B 1702 series specifically covers the "ISO system of flank tolerance classification". It applies to individual cylindrical gears rather than gear pairs. The standard defines: jis b 1702-1 pdf

Accuracy Grades: It describes 13 grades of gear accuracy, ranging from Grade 0 (the highest precision) to Grade 12 (the lowest).

Measurement Parameters: Accuracy is determined by evaluating specific deviations, including: Single Pitch Deviation ( fptf sub p t end-sub

): The difference between the actual measured pitch and the theoretical circular pitch.

Total Profile Deviation: Measures how closely the actual tooth profile matches the ideal involute curve.

Total Helix Deviation: Evaluation of the tooth trace or lead error. Technical Constraints

The tolerances outlined in JIS B 1702-1 apply to gears within specific geometric ranges: Reference Diameter ( ): 5 mm to 15,000 mm. Normal Module ( ): 0.5 mm to 70 mm. Number of Teeth ( ): 5 to 1,000. Helix Angle ( ): Up to 45°. Comparison with Related Standards

The JIS B 1702 series is divided into multiple parts to address different measurement methods and materials: Accuracy of Gears | KHK

The JIS B 1702-1 is a Japanese Industrial Standard that defines the accuracy and tolerance classification for cylindrical gears (spur and helical gears). It was last revised in 2016 and is technically aligned with the international standard ISO 1328-1. 🔩 Core Purpose

This standard provides the framework for classifying the quality of a gear based on its deviations. It is essential for engineers and manufacturers to ensure that gears fit correctly and perform predictably in machinery. 📋 Key Components

The standard focuses on four primary types of gear deviations:

Pitch Deviations: Differences in the distance between corresponding points on adjacent teeth.

Profile Deviations: Deviations of the actual tooth profile from the theoretical involute shape.

Helix Deviations: Variations in the tooth surface along the axial direction (lead error).

Tangential Composite Deviations: Combined errors measured as the gear rotates. 📊 Understanding Accuracy Grades

Grade System: Gears are assigned a numeric grade (typically 0 to 12).

Higher Precision: Lower numbers (e.g., Grade 0 or 1) indicate extremely high precision, used in aerospace or master gears.

Standard Industrial: Grades 6 through 9 are common for general industrial machinery.

Rough Work: Higher numbers indicate looser tolerances for less critical applications. 🔗 Where to Access the PDF Understanding Jis B 1702-1 Pdf: A Comprehensive Guide

The full document is protected by copyright and typically requires a purchase or a subscription.

Official Source: You can buy the official English or Japanese version through the Japanese Standards Association (JSA) Webdesk.

Previews & Guides: Technical summaries and calculation guides are often available via manufacturers like KHK Gears or Scribd for educational purposes.

📍 Key Anchor: This standard is part of a 3-part series; Part 2 covers radial composite deviations, and Part 3 specifically addresses injection-molded plastic gears.

JIS B 1702-1 standard, titled "Cylindrical gears — ISO system of flank tolerance classification — Part 1: Definitions and allowable values of deviations relevant to corresponding flanks of gear teeth"

, is the Japanese Industrial Standard that defines the accuracy and quality levels for cylindrical gears. Core Overview

Established to align Japanese manufacturing with international standards, JIS B 1702-1 is technically equivalent to ISO 1328-1

. It replaced the older 1976 version of the JIS gear accuracy standards to provide a more rigorous, mathematically defined classification system. Key Specifications & Classification Accuracy Grades : The standard defines 11 quality grades , ranging from (highest precision, typically for master gears) to

(lowest precision, for basic machinery). Note that grades 1 and 2 are often omitted in practical tables as they are rarely manufactured. Module Range : It covers gears with modules ranging from Diameter Range : Applicable to gears with pitch diameters up to

: Specifically addresses "corresponding flanks," meaning it focuses on the deviations of the tooth surfaces that actually come into contact during mesh. Primary Deviations Measured

The standard provides allowable values for several critical gear metrics: Single Pitch Deviation (

The difference between the actual pitch and the theoretical pitch. Total Cumulative Pitch Deviation ( cap F sub p The maximum deviation across all teeth in the gear. Total Profile Deviation ( cap F sub alpha The total error in the shape of the tooth profile. Total Helix Deviation ( cap F sub beta

The error in the alignment or "twist" of the tooth along its width. Transition from Old JIS (1976)

Users familiar with the "Old JIS" (JIS B 1702-1976) should note significant differences:

: The old system used Grades 0 through 9 (with 0 being the best). The new system (1702-1) aligns with ISO, where is far more precise than the old Grade 0. Calculation

: Tolerance values in 1702-1 are calculated using specific geometric formulas rather than fixed step tables, allowing for more precise scaling based on gear size. Where to Find the PDF

Because JIS standards are copyrighted intellectual property, the official full-text PDF is generally not available for free. You can obtain the official document through these authorized bodies: JSA (Japanese Standards Association) : The primary source for official JIS documents.

: Since it is identical to ISO 1328-1, the ISO version is often used interchangeably in international trade. Gear Manufacturers Scope : The standard applies to spur and

: Many Japanese gear companies (like KHK Gears) provide condensed versions of these tolerance tables in their technical catalogs for engineering reference. for a specific gear grade and module?

6. How to Find a Legitimate Copy (Action Steps)

If you need the PDF for professional use:

  1. Check your company’s internal document management system – Many ISO 9001 or JIS-certified companies already purchase and store a licensed PDF.
  2. Visit the JSA Web Store (https://webdesk.jsa.or.jp) – Search “JIS B 1702-1” → Purchase → Instant download.
  3. Use KIKAKU for free online reading (https://kikakurui.com) – Search the standard number; view each page as an image. No download, but fully legible for one-time reference.
  4. Request via interlibrary loan – Some engineering libraries keep physical copies, but PDFs are rarely loaned.
  5. Purchase from ISO (if you already have an ISO subscription) – Since it’s identical to ISO 1328-1:2013, you can use that document interchangeably.

Practical Application: Using the Standard in Manufacturing

You have the PDF. Now, how do you use it?

Step 1: Define the Gear Data You need: Module (m), Number of teeth (z), Reference diameter (d), Face width (b).

Step 2: Select the Grade Open your JIS B 1702-1 PDF to Section 5 (Classification). Decide the grade (usually 5, 6, 7, or 8).

Step 3: Calculate the Tolerance Values The PDF provides formulas. For example, the tolerance for single pitch deviation (fpt) might be calculated as fpt = 0.6 + 0.02m. Cross-reference this against the tables.

Step 4: Inspection Using a gear measuring machine (GMM), measure the actual gear. If the deviation is less than the PDF's table value, the gear passes.

2. Why Users Search for the PDF

Engineers and technicians seek the PDF version for several practical reasons:

3. The "Fα" (Profile Form Deviation)

This is the shape accuracy of the involute curve. The PDF includes complex formulas involving base circle radius. Do not try to memorize this; use the lookup tables.

2. Key Technical Papers & Documents

Instead of looking for the standard itself, look for these papers which interpret or utilize the standard. These are often available on university repositories or ResearchGate.

1. Overview of JIS B 1702-1

Title: Cylindrical gears — Accuracy of individual specifications — Part 1: Definitions and allowable values of deviations relevant to corresponding flanks of gear teeth

Committee: Japanese Industrial Standards Committee (JISC), Technical Committee on Machine Elements

Published Date (Current Version): Typically 2015 (confirmed/enacted in 2016). Older versions (e.g., 1998) are still referenced in legacy machinery.

Scope of the Standard: JIS B 1702-1 specifies the accuracy requirements for individual cylindrical gears (external and internal) with involute teeth. It defines:

Relationship to International Standards: Crucially, JIS B 1702-1 is technically identical to ISO 1328-1:2013 (and previously to ISO 1328-1:1995 for older revisions). This means that JIS accuracy grades correspond directly to ISO grades. This harmonization ensures global interchangeability of gear inspection data.

4. How to Access the Content Legally

If you need the actual standard for certification or legal compliance:

1. Table 1 – Tolerance Grades

This defines the allowable deviations. For example: