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 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.



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.



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.


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.


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.

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.


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.



Our team of technical experts offer industry-leading consultation services, equipment sales and support and with a wealth of project management and technical experience, we plan and deliver. We work with you to ensure a smooth project from design specification to onsite installation. Our impartial guidance and multi-supplier approach mean we are focused on finding you the best solution meaning you can be confident in both our services and products.

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