Section 4 Transmission systems
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules for the Classification of Air Cushion Vehicles, July 2022 - Chapter 4 Machinery - Section 4 Transmission systems

Section 4 Transmission systems

Parent topic: Chapter 4 Machinery

4.1 General requirements

4.1.1 The requirements of SSC Rules, Pt 11, Ch 2, 1 General requirements apply, except where modified by this Section.

4.1.2 Shafts transmitting torque to propulsion and lift fans are to be suitably supported. Drive belt pulley shafts are to be sufficiently sized and supported to absorb lateral bending forces and minimise deflection of the shaft at all operating loads and speeds.

4.1.3 Suitable measures are to be provided to isolate the engine crankshaft from lateral forces arising from the transmission arrangement.

4.1.4 Suitable means are to be provided to absorb axial thrust forces from lift fans and air propellers.

4.1.5 Rolling element bearings are to be sealed against the ingress of water and airborne contaminants.

4.1.6 Where drive belts are used for power transmission the following requirements are applicable:

  1. belts with positive traction are to be used;

  2. belt tensioning devices are to be provided with suitable securing and locking arrangements;

  3. belt alignment is to be within the belt manufacturer’s design tolerance.

4.1.7 Drive arrangements for propellers and lift fans, outside of the enclosed machinery space, are to be protected from foreign objects and airborne sand/grit.

4.1.8 Guards are to be installed around all exposed drive arrangements.

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