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KHK Worm Gears Catalogue

KHK Worm Gears Catalogue

Product catalog summary

Overview: This document provides comprehensive specifications and guidelines for selecting and using KHK stock worm gears and worm wheels. It covers catalog numbers, material types, special characteristics, efficiency, self-locking features, and precision standards.

Specifications: Catalog numbers are structured based on material type, module, and thread specifications. Worms are made from materials like SCM440 and S45C, while worm wheels use materials such as CAC702 and MC901. The document details available modules and reduction ratios for different gear types.

Special Characteristics: Feature icons indicate compliance with standards like RoHS, and characteristics such as being re-machinable, heat-treated, or injection molded. Efficiency of worm gear pairs varies from 30% to 90% based on assembly conditions and lubrication.

Efficiency and Self-Locking: Efficiency tables are provided for various worm gear pairs at different RPMs. The self-locking feature is influenced by factors like material, lead angle, and lubrication.

Selection and Assembly: The document advises on selecting mating gears based on helix and thread compatibility, emphasizing gear strength and proper mounting distances to achieve specified backlash.

Precision Standards: KHK establishes precision grades for worms and worm wheels, with allowable errors defined for different module sizes. Tables detail tooth profile and lead errors, as well as overall length tolerances.

Application Hints: Users are advised to read application hints carefully and contact KHK for clarifications. Specific cautions are provided for reboring and assembling to ensure optimal performance and safety.

Specifications and Design Considerations: The document discusses handling thrust forces and the importance of proper assembly, recommending appropriate bearings and securing methods to prevent shifting.

Assembly and Orientation: Proper assembly minimizes friction. Steps are outlined to verify orientation, ensuring the worm axis is perpendicular and centered on the worm wheel face width.

Duplex Worm Gears: Allow for backlash adjustment by axially shifting the worm. A formula for calculating backlash changes is provided, along with explanations of the unique tooth profile.

Assembly Cautions: Align arrows on the worm and worm wheel to ensure proper orientation. Incorrect assembly can lead to increased center distance and improper gear engagement.

Specifications of Worms and Worm Wheels: Detailed specifications for various modules, including precision grade, material, heat treatment, and tooth hardness. Dimensions and allowable torques for different catalog numbers are listed.

Application Examples and Adjustments: Examples of applications using SW Worms and BG Worm Wheels are provided, along with methods for backlash adjustment using screws and shims.

Product Characteristics and Cautions: Cautions on product characteristics, such as axial thrust forces and the importance of following specified tolerances, are included. Recommendations for secondary operations and proper orientation during assembly are highlighted.

Procedures and Cautions: Emphasizes reading the 'Caution on Performing Secondary Operations' section before modifications. Gear teeth are induction hardened, restricting secondary operations on tooth areas.

Allowable Torques: Tables show allowable worm wheel torques for different catalog numbers and RPMs, critical for ensuring durability and performance.

Recommendations: Follow specified guidelines for secondary operations and use recommended tools and procedures to maintain gear integrity and performance.

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