ELGOTEX-WA filament wound bushes, water‑resistant
Features
In contrast to the standard design of ELGOTEX, ELGOTEX-WA is specially developed for use in water as well as salt water and sea water. Shipbuilding is an important area of application. Furthermore, ELGOTEX-WA is also highly suitable for use in marine engineering, hydromechanical steel structures and water power generation as well as in pumps and turbines.
The specific characteristic of ELGOTEX-WA lies in the specific matching of fibre and matrix to the particular operating conditions. The inner sliding layer contains a polymer/PTFE sliding filament that is embedded together with fillers and solid lubricants in a resin matrix. This is hydrophobic and dimensionally stable. The backing, which is reinforced by means of glass fibre, ensures the necessary strength of the bush. The thickness of the sliding layer and backing layer is specifically designed in accordance with the requirements of the application and thus of the wear limit.
Microsection of the sliding layer of an ELGOTEX-WA filament wound bush
Availability
ELGOTEX-WA filament wound bushes have the suffix WA.
ELGOTEX filament wound bushes with special dimensions up to an outside diameter Do = 1 200 mm, special tolerance classes or in the form of segment bearings are possible and may be available by agreement from Schaeffler.
Technical data for ELGOTEX-WA
Maintenance-free ELGOTEX filament wound bushes have the following mechanical and physical characteristics, see table.
Slight settling of the material occurs during running-in.
ACHTUNG
In the production of ELGOTEX-WA filament wound bushes, defects (pores) and fraying may occur in the PTFE due to the production process. These cannot be prevented by technological measures and do not represent any impairment of the function.
For information on the rating life, please consult the Schaeffler engineering service.
Characteristics of ELGOTEX-WA
Characteristic | ||||
|---|---|---|---|---|
Maximum pv value** | pv | 1,2 N/mm2 · m/s | ||
Permissible specific | Static | pmax | 150 N/mm2 | |
Rotary, oscillating | 50 N/mm2 | |||
Certified specific bearing load in accordance | 15 N/mm2 | |||
Permissible sliding velocity | v | 0,024 m/s | ||
Permissible operating temperature | ϑ | –20 °C to +130 °C | ||
Coefficient of friction | μ | 0,05 to 0,15 | ||
Operating life behaviour with: | ||||
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| Dry running | +++ | ||
Grease and oil lubrication | + | |||
Media lubrication, water lubrication | +++ | |||
Definition of the symbols: | |
+++ | Very good |
+ | Adequate |
**The maximum permissible bearing load as a function of velocity is determined by means of pv diagrams, ➤ Figure.
pv diagram
Certification
The rudder bearing is a safety-relevant component and must therefore be monitored by classification companies such as Lloyd, Lloyds Register, DNV or Germanischer Lloyd. For this reason, the bearing positions, the bearing itself and its design must be certified before mounting.
On the basis of a specification issued by Germanischer Lloyd, Schaeffler has completed a comprehensive programme of testing in this direction. This has fully demonstrated the functional capability of the plain bearings. For INA plain bearings with ELGOTEX-WA, the performance capability in salt water has been certified in accordance with MCM-0112 from Germanischer Lloyd, ➤ Figure and ➤ Figure.
This approval is valid for:
- rudder carrier bearings
- shaft bearings
- pintle bearings
- bearings for stabilisers.
Schaeffler is the first manufacturer to receive approval from this classification company for a maximum specific bearing load on the plain bearing of 15 N/mm2.
Application for rudder bearing
ELGOTEX filament wound bush
Ordering designation
Water-resistant ELGOTEX-WA filament wound bushes are matched to the specific application. For available sizes, please place an enquiry with Schaeffler on the basis of the following ordering designation, ➤ Figure.
Structure of the designation
RS (on one side)
2RS (on both sides) ·
