Providing the crucial steering and manoeuvrability of any vessel – the fitted rudder or rudders are an essential part of continued operation.

围绕舵产生的力与血管的尺寸和速度成比例 - 在大容器的巡航血管的情况下,通过轴承支撑到船舶结构的巨大载荷。给定高负荷,几乎连续旋转在一个方向上或其他 - 良好的润滑是必不可少的

Rudders

Rudders are most usually sited at the aft end of a vessel and depending on design may be a single blade aft of a propeller, or twin blades mirrored along the centreline of the vessel.

在移动的同时保持大海的转向过程或旋转容器的努力大,大部分舵系统都是液压驱动和控制的。Rudderstock直径可以在船舶较大的休闲船上仅在休闲船上的几厘米中变化,在船上的情况下超过1.5米。

舵载荷通过轴承支撑,从而舵的重量以及鲁德斯托克顶部和底部的旋转和侧载。

Fitted bearing

安装轴承可以是水或油脂润滑 - 配有各种类型的密封,以防止海水或磨料进入轴承或润滑脂润滑剂逸出到海中。

Two main types of rudder seal are fitted in the majority of installations:

  • Face seal – where the sealing interface is in an axial direction along the rudderstock, and the rotating part of the seal contacts a static seat housed within the rudder trunk.
  • Lip seal – where the sealing interface is in a radial direction with the rotating rudderstock liner rotating relative to lip seals contained within the rudder trunk.

在这两种情况下,良好的性能和长寿依赖于正确的润滑,对齐和定期检查。

Maintaining

保持轴承和密封件的良好润滑是最大限度地利用设备的寿命。看到过多的磨损或过早失败的大多数问题是由于缺乏正确的润滑 - 润滑脂润滑系统依赖于密封件以保持轴承周围的油脂。

Classification Society Surveyors will want to see records of rudder bearing clearance values. A rapid increase or values above acceptable limits will trigger conditions being imposed and require docking.

Through the life of the vessel, bearing wear will occur naturally but in cases where bearing wear within acceptable limits will affect seal function – grease can be lost contributing to pollution and accelerated wear. In such cases we have previously supported customers with bespoke higher tolerance seals to maximise remaining bearing life.

舵密封调查

Within a rudder seal survey, AtZ would gather all available operating information from the vessel, before planning a more detailed inspection. This would include:

  • Onboard monitoring data and drawing review
  • Hydraulic and control system inspection
  • Checking bearing clearance (where possible afloat / in dock)
  • Checking lubrication log and estimating any leakage rates
  • 论系统状况和剩余寿命的结论
  • Support required parts, service or upgrade proposal

A full and detailed survey of the rudderstock bearings and rudderstock liners could usually only be completed in dry dock with partial or full removal of the rudder.

In the case rudders are removed, we would always recommend a full bearing inspection with replacement as required and replacement of all seals.


FAQ’s

润滑脂消耗很高,但我们有可接受的间隙 - 这是一个问题吗?

Yes – grease is escaping into the sea, and whether EAL or mineral based this is unacceptable.
Grease escaping is evidence that the seals have failed, are damaged, or are incapable of operating with the bearing clearances imposed.
Seals must be replaced with new items and in the case of increased bearing clearance, should be with a seal capable of operating with the full range of rudderstock movement.
这通常可以与活动服务一起完成,但是对系统设计和访问的审查需要从ATZ提供完整的提案。

我们想改为EAL润滑脂和液压油 - 这是一款直的交换吗?

No – each part of the rudder system needs to be considered for compatibility first. A system flush may be required and some seals and other equipment might need to be changed for a compatible material.
ATZ可以查看系统并告知升级所需步骤。

我们的船只是新建立的,虽然所有人都出现,我们在舵的大海中有一些不寻常的噪音?

We have seen many cases in which equipment has been installed with no or poor alignment accounting for loaded parameters of the vessel.
An urgent review of the system together with an alignment check in service would be the best course of action to identify root cause. In some cases, it may also be possible to conduct a bearing clearance survey in service.

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