Bearing element in shock absorbers
SECTOR:
Industrial technology, damping technology, automotive, utility vehicles, mechanical engineering
PRODUCTS USED
FUNCTION
Shock absorbers absorb mechanical vibrational energy. Shock absorbers, coupled with springs, are installed on the chassis in order to ensure that vibrating masses are damped as quickly as possible. On motor vehicles, they represent a safety-relevant component in the form of hydraulic twin-tube dampers. Damping is carried by means of movement and internal friction of viscous fluids, usually oils, that flow from one working area to the other in the damper in accordance with the direction of movement of the vibration occurring. Mass-spring-damper systems are coordinated with one another, meaning that no undesired high amplitudes or uncontrollable vibrations are to result.
Application in shock absorber systems
Plain bearing requirements
From the asphalt road to the dirt track, from extremely low to very high temperatures, and, on top of that, load changes, wet conditions, dirt: shock absorber systems must prove themselves to be absolutely reliable under extremely various conditions. Space-saving and optimally coordinated plain bearings play a major role here. In order not to affect the damping characteristics, the friction values of the plain bearings have to be continuously low over the entire lifecycle. The plain bearings also have to be wear resistant, insensitive to edge loads and resistant to flow erosion.
Bearing element with Permaglide® P203 plain bearing bushes
With the material composition Permaglide® P203, a reliable plain bearing material has been created which fulfils the application's requirements. The material is designed as a low-maintenance and lead-free material and is approved for a temperature range from –200°C to 130°C. It is compatible with all types of oils and does not have a tendency to undesired swelling. The material has proved itself to be extremely suitable in shock absorbers, even in the case of inadequate lubrication, as well as in use on poor surfaces.
Bearing element with Permaglide® P141 plain bearing bushes
In the case of chassis where maximum performance is required, shock absorbers are used with plain bearing bushes made from Permaglide® P141. Permaglide® P141 is a high-performance material with a particularly high resistance to flow erosion and an operating temperature of up to 250°C. P141 therefore impresses in systems with liquid lubrication as well as – thanks to its self-lubricating PTFE matrix – in dry-running applications.
Bearing element with Permaglide® P180 plain bearing bushes
To improve comfort and achieve good NVH performance in vehicles (NVH = Noise, Vibration, Harshness), plain bearing bushes made from Permaglide® P180 are used in shock absorbers. Permaglide® P180 is a lead-free, high-performance material with outstanding tribological performance and a temperature range of –200 °C to 280 °C. P180 can be used for all manner of applications and functions well in systems with liquid lubrication as well as in dry-running applications.
The material P180 has lots of benefits for use in shock absorbers, for example:
- very low stick-slip tendency
- constant, low friction throughout the entire service life
- maximum load capacity and wear resistance, especially in the case of edge wear
- high erosion resistance
Bearing element with Permaglide® P203 plain bearing bushes
With the material composition Permaglide® P203, a reliable plain bearing material has been created which fulfils the application's requirements. The material is designed as a low-maintenance and lead-free material and is approved for a temperature range from –200°C to 130°C. It is compatible with all types of oils and does not have a tendency to undesired swelling. The material has proved itself to be extremely suitable in shock absorbers, even in the case of inadequate lubrication, as well as in use on poor surfaces.
Bearing element with Permaglide® P141 plain bearing bushes
In the case of chassis where maximum performance is required, shock absorbers are used with plain bearing bushes made from Permaglide® P141. Permaglide® P141 is a high-performance material with a particularly high resistance to flow erosion and an operating temperature of up to 250°C. P141 therefore impresses in systems with liquid lubrication as well as – thanks to its self-lubricating PTFE matrix – in dry-running applications.
Advantages of Permaglide® P180 plain bearings
- Very low stick-slip tendency
- Extremely resilient, especially with edge wear
- Low and constant friction value
- Very good wear resistance in dry running and wet running
- Can be used universally: suitable for rotary, oscillating and axial applications
- Excellent chemical resistance
- High resistance to erosion
- Largely resistant to swelling
- Compatible with all common dry-running steel shafts
ADVANTAGES OF PERMAGLIDE® P203 PLAIN BEARINGS
- Low wear
- Very good emergency running properties
- Insensitive to edge loads
- Insensitive to impact loads
- Good damping characteristics
- Good chemical resistance
ADVANTAGES OF PERMAGLIDE® P141 PLAIN BEARINGS
- Can be used universally
- Low friction values
- High wear resistance
- Resistant to erosion
- Extremely good performance in dry running as they are self-lubricating
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