Section 3 Materials
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 11 Transmission Systems - Chapter 1 Gearing - Section 3 Materials

Section 3 Materials

Parent topic: Chapter 1 Gearing

3.1 Requirements and specifications

3.1.1 Components for gearboxes are to be in accordance with the Rules for the Manufacture, Testing and Certification of Materials, July 2022 (hereinafter referred to as the Rules for Materials).

3.1.2 Manufacturer’s certificates for forgings may be accepted where the transmitted power does not exceed 220 kW, see Ch 1, 3.1 General 3.1.3.(b) of the Rules for Materials.

3.1.3 In the selection of materials for pinions and wheels, consideration is to be given to their compatibility in operation. Except in the case of low reduction ratios, for gears of through-hardened steels, provision is also to be made for a hardness differential between pinion teeth and wheel teeth. For this purpose, the specified minimum tensile strength of the wheel rim material is not to be more than 85 per cent of that of the pinion.

3.1.4 Gear wheel and rim forgings with a specified minimum tensile strength not in excess of 760 N/mm2 may be made in carbon-manganese steel. Gear wheel or rim forgings where the specified minimum tensile strength is in excess of 760 N/mm2, and all pinion or pinion sleeve forgings are to be made in a suitable alloy steel.

3.1.5 Forgings for couplings, quill shafts and gear wheel shafts are to comply with the requirements of Pt 11, Ch 2 Shafting Systems.

Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.