Bearing element in shock absorbers

SECTOR:

Industrial technology, damping technology, automotive, utility vehicles, mechanical engineering

PRODUCTS USED

KS Permaglide® plain bearing bush, design PAP … P203/P141

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.


BEARING ELEMENT WITH KS PERMAGLIDE® P203/P141 PLAIN BEARING BUSHES

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.

With the material composition KS 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.

In the case of chassis where maximum performance is required, shock absorbers are used with plain bearing bushes made from KS Permaglide® P141. KS 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 KS 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

MATERIAL DESCRIPTION FOR KS PERMAGLIDE® P203

KS Permaglide® P203 is a lead-free, environmentally friendly bearing material with a very high performance. Thanks to a special combination of bulking agents, high wear resistance is achieved while simultaneously maintaining very good emergency running behaviour. The material is therefore ideally suited to low-maintenance, grease or liquid-lubricated applications subject to more stringent requirements. Plain bearing bushes made from P203 are ready to install and have a smooth sliding surface. Plain bearings made from KS Permaglide® P203 are available on request.


ADVANTAGES OF KS 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

MATERIAL DESCRIPTION FOR KS PERMAGLIDE® P141

KS Permaglide® P141 is a lead-free bearing material that is used particularly in systems with liquid lubrication and a high degree of mixed friction. Grease as a lubricant is only recommended conditionally. Furthermore, P141 can also be used in dry running. The material is manufactured in a continuous sinter impregnation process. The bronze sliding layer is sintered in a specially adjusted sintering process on a steel base with an average pore volume of approx. 30%. In these cavities, a solid lubricant mass is impregnated and thermally treated.

KS Permaglide® P141 is characterised by a low friction value, very good emergency running properties and high resistance to flow erosion. Plain bearings made from P141 are particularly suitable for use in high-pressure injection pumps and as guide elements in shock absorbers. This material system meets the requirements of EU Directive 2000/53/EC (EU End of Life Vehicle Directive).

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