Overview: The document provides comprehensive technical specifications and guidelines for spur gears, focusing on types, materials, configurations, and application hints. It covers gear characteristics, heat treatment, and assembly recommendations.

Specifications: Spur gears are available in various modules and materials such as SCM415, S45C, and SUS303, each offering unique properties like rust resistance. Types include ground, hubless, and thin face spur gears. Precision grades are defined by JIS standards, with specific grades for different gear types.

Procedures: Guidelines for selecting mating gears, considering gear strength, and performing secondary operations like reboring and keyway slotting are provided. Proper backlash and parallel shaft alignment during assembly are emphasized.

Standards and Norms: Gear precision is defined by JIS B 1702-1:1998 standards. Heat treatment specifications, such as carburizing and induction hardening, are included to enhance gear strength and durability.

Recommendations: Users should compute gear strength based on actual usage conditions and consider factors like starting torque. Methods to secure gears to shafts, such as keyways and set screws, are suggested.

Key Data from Tables: Tables list gear types with modules, materials, heat treatment methods, and precision grades. Guidelines for calculating bending strength and surface durability are provided, with examples of potential failures due to insufficient strength.

Application Hints: Proper assembly is crucial to avoid noise and wear. Examples of applications include automatic packing machines and electric wire winders.

Critical Information: The document stresses the importance of careful gear selection and assembly to ensure optimal performance and longevity. Adhering to specified heat treatment processes is crucial to prevent complications and maintain gear precision.

Product Characteristics and Cautions: Keyway dimensions adhere to JIS (Js9) tolerance. Allowable torques are calculated based on assumed usage conditions. Secondary operations are restricted due to the carburizing process.

Ground Spur Gears and Pinion Shafts: Detailed tables list specifications for ground spur gears and pinion shafts, including keyway dimensions, allowable torque, backlash, and weight.

Center Distance and Assembly: Tables for calculating center distance when meshing gears with different numbers of teeth and profile shifts are included, along with formulas for determining assembly distances.

Additional Notes: Adhering to specified conditions is crucial, and secondary operations on precision-finished gears should be avoided. KHK's system for quick modification of stock gears is available.