Direct contact
Harald Nitzschke +49 (0) 7303 92874 - 0 nitzschke@ttv-gmbh.de
| Profile | Design | Resilience | Temperature Range | Sliding Speed limit | Friction coefficient | limit value (dry) | limit value (oil) |
|---|---|---|---|---|---|---|---|
 |
GETRO-1W - ROHS | 140 N/mm2 | -195°C to +280°C | 5 m/s | 0.03 - 0.18 | 4.3 N/mm2 × m/s | 50 N/mm2 × m/s |
 |
GETRO-1T | 140 N/mm2 | -195°C to +280°C | 10 m/s | 0.03 - 0.18 | 4.3 N/mm2 × m/s | 60 N/mm2 × m/s |
 |
GETRO-1D - ROHS | 140 N/mm2 | -195°C to +280°C | 3 m/s | 0.04 - 0.40 | 3.8 N/mm2 × m/s | 50 N/mm2 × m/s |
 |
GETRO-1B (TU-B) | 140 N/mm2 | -195°C to +280°C | 5 m/s | 0.03 - 0.18 | 4.3 N/mm2 × m/s | 50 N/mm2 × m/s |
 |
GETRO-1S (DI)- ROHS | 140 N/mm2 | -195°C to +280°C | 2.5 m/s | 0.04 - 0.20 | 3.6 N/mm2 × m/s | 50 N/mm2 × m/s |
The GETRO-1X bearings are encapsulated sliding bearings made of a three-layer composite produced from a steel strip, a sintered-on porous bronze layer and a surface sliding layer made of PTFE. This type of bushing has a low friction coefficient and protection against wear and corrosion, and can be used without oil. The low manufacturing costs and top-of-the-range technical foundations mean that these bushings are used in a variety of different kinds of sliding applications, such as in textile manufacturing machinery, hydraulic systems and automotive machinery as well as agricultural and forestry machinery. This type of bushing can also be used in the food and pharmaceutical industries as well as in various industrial sectors.
Rolled dry sliding bushing GETRO-1T
The GETRO-1T consists of a specially developed PTFE surface sliding layer and is particularly suited to applications with high PV ratings, such as transmission oil pumps.
This type of bearing is primarily used in hydraulic systems or for boundary lubrication, and in medium or high-pressure transmission oil pumps (P = 16 – 25 Mpa, V = 3,5 – 5 m/s). The friction coefficient and the wear and shock-resistant properties have undergone additional improvements. With hydrodynamic lubrication, the PV limit was reached at 120 N/mm² m/s. These sliding bushings are used in transmission pumps as well as in piston pumps and vane pumps.
Rolled dry sliding bushing GETRO-1D-ROHS
The 1D bearing is particularly suitable for linear or axial movements. This type of bushing is particularly wear-resistant and can retain lubricant well, even if it has a long service life. It also simultaneously protects the mating surfaces from wear and tear.
This type of bushing is generally used as a piston ring in shock absorbers for cars and motor cycles and for various hydraulic cylinders, hydraulic motors and pneumatic components.
Rolled dry sliding bushing GETRO-1B (TU-B)
The GETRO-1B bushings consist of a PTFE layer sintered onto a bronze strip. These bushings are corrosion-resistant and are suited to high-temperature applications that can be carried out without the use oil requiring long operating cycles.
This type of bearing is used radially or axially, particularly in the steel and cement industries. The GETRO-1B bearings can be used in panels as bridge bearings, as the thick inner surface sliding layer can withstand a load of up to 140 N/mm².
Rolled dry sliding bushing GETRO-1S (DI)-ROHS
GETRO-1S sliding bushings are oil-resistant, acid-resistant, alkali-resistant and salt-water-resistant.
Furthermore, the PTFE surface sliding layer is lead-free, meaning that this type of bushing can be used for applications in the food industry, for alkali-flow measuring devices, in pharmaceutical machinery, printing machinery, in chemical engineering and in the shipping industry.
Conclusion: PTFE sintered bearings can generally run dry. The PTFE layer (polytetrafluoroethylene) has very good sliding properties even without external lubrication. This is why rolled dry sliding bushings (PTFE) also function without any oil or grease in extreme environments.
The lubricant depots in GETRO-090 and -092 provide optional support and improve the lubricating effect under normal conditions. However, they are not absolutely necessary for the bearing to function.
Outer diameter:
After pressing in, measure the outer diameter in accordance with ISO 3547 (Test A). A device clamps the PTFE sliding bushing in two shell halves and applies controlled pressure. This allows you to check whether the bearing is within the specified tolerances and is seated without tension. The PTFE bearing will only run without play if the outer diameter is correct.
Inner diameter:
Measure the inner diameter only after pressing in (ISO 3547, Test C). Please use 3-point measuring devices or air gauges for this. The inner diameter cannot be reliably determined before pressing in because the PTFE dry sliding bushing is still malleable and not fixed in place.
Why is this important?
Rolled PTFE dry sliding bushings are usually used in heavily loaded machines. Even small dimensional deviations can lead to uneven loading, high wear, or even failure. By checking the dimensions carefully, you can ensure that the rolled dry sliding bushing will operate reliably and safely even at extreme temperatures.
For special requirements, we offer rolled PTFE dry sliding bushings with other carrier materials:
Important: The PTFE sliding layer may contain additives, such as lead (Pb), to improve emergency running properties. However, there are lead-free variants available, such as the ttv-1S PtFE sliding bushing.
This standard specifies exactly how to measure inner and outer diameters and what the permissible tolerances are. If you adhere to this standard, the PTFE dry sliding bushings will fit precisely, be easy to replace, and run reliably.
The PTFE layer ensures that friction remains very low and the PTFE bearing hardly wears at all. This is why PTFE dry sliding bushings function perfectly even without oil or grease.
However, if you are using very high loads or speeds and reaching the technical limits, a small amount of lubricant can extend the service life of the PTFE dry sliding bushing.
Important:
If you adhere to these limits, the PTFE dry sliding bushings will operate reliably even without relubrication.
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