AGMA 04FTM10-2004
大型船用齿轮的故障调查和更换

The Failure Investigation and Replacement of a Large Marine Gear

标准号

AGMA 04FTM10-2004

发布日期

2004年

实施日期

废止日期

无

中国标准分类号

J17

发布单位

US-AGMA

适用范围

The three Carrier Vertical Strike (CVS) platforms in service with the UK Royal Navy (RN) provide the platform and facilities for the command and control of maritime and joint forces. They are 209m in length, displace 22,000 tonnes and have a complement of 685 ship's company and 386 Air Group personnel. Powered by four 18MW Olympus gas turbines, they are capable of 28kts (see Figure 1). The CVS class was originally designed to carry large numbers of anti-submarine helicopters and to be protected from air attack by the Sea Dart weapons system. Sea dart has now been removed and the flight deck extended to increase the space available for parking aircraft. These versatile ships now deploy regularly with RAF Harrier GR7 strike aircraft aboard, as part of a mixed air group that can be tailored to operational needs. Air groups also include Sea Harrier FA2s, providing air defence, Sea King, Merlin and Chinook helicopters. With these capabilities, the high value of the CVS platform has been demonstrated in many events since the 1980’s. Each CVS is fitted with two main propulsion gearboxes, the largest and most complex in RN service, designed and manufactured by David Brown, now part of the Textron group. The triple reduction, reversing, double helical tandem design transmits power from either one or two Olympus gas turbines to a fixed pitch propeller. Manoeuvring ahead and astern is achieved by means of fluid couplings and for high power ahead operation drive is transmitted through two SSS clutches. The gearbox weighs 170 tonnes and contains 19 gear elements, the largest being the main wheel, which is 3m in diameter and weighs 22 tonnes (see Figure 2). In December 1999, during the Chief Engineer's supercession inspection of HMS INVINCIBLE’s stbd gearbox, ship's staff identified damage to a number of teeth on the main wheel. A full dye penetrant non-destructive examination (NDE) of the main wheel by David Brown revealed cracks originating from surface pits in 11 teeth. These varied in length up to a maximum of 30cm - see Figure 3.