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NOVÉ PRODUKTY
| What shock absorbers are for
Shock absorbers slow down the vibrations generated by wheels, axles and the chassis. Therefore, the technically correct name is vibration damper.
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In automobiles, vibration dampers are usually used as twin tube or mono tube shock absorbers. In both cases, the piston moves in a cylinder filled with oil. The piston forces the oil though orifices of different sizes, slowing the movement of the rod, and controlling the spring. |
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Functional principle of twin tube shock absorbers: With a Twin-Tube shock absorber, the piston works inside of an inner Tube. The space between the inner tube and the casing is used as an equalization chamber. Changes in volume due position of the piston rod change the oil level in the equalization chamber between the outer casing and inner Tube. Compression phase: When the car swings downwards in the direction to the road, the piston rod is moved downwards. The oil displaced by the piston rod is pressed into the equalization chamber between the Tubes via specially designed orifices in the compression valve at the lower end of the inner Tube. The resistance that is created through this valve creates the actual compression forces. Oil underneath the piston also flows upwards through the piston check valve with low resistance which also influences the damper characteristics. Rebound phase: When the car swings upwards, away from the road, the shock absorber is extended. The piston rod is extending outward from the housing. The rebound phase valve at the lower Tube resists the oil that flows downwards through the holes in the space above the Tube. Therefore the upward motion is slowed down. When the piston rod is pulled out of the case, its volume is balanced out by the oil that flows from the equalization chamber back into the inner tube through the compression check valve. |
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Functional principle of mono tube shock absorbers: With a one-piston shock absorber, the piston works directly in the damping case. Both, traction and also compression phase valve are integrated into the piston at the end of the piston rod. Depending on the velocity with which the shock absorber is compressed or extended, the forces rise. A characteristic is the separating piston that separates the oil from the gas space which is under strong pressure. The gas space balances the oil expansion with temperature differences and volume changes while the piston rod retracts. The separating piston thereby moves upwards and downwards. The gas pressure of 25-30 bar in the separating space is necessary in order to support the damping forces in direction of the pressure direction. Compression phase:When the car swings downwards in the direction to the road, the piston rod is moved downwards. The compression phase valve on the top of the valve resists the oil that streams upwards through holes. Therefore, the downward movement is slowed down. The separating piston is thereby lowered by the same degree as the piston retreats downwards. The gas pressure underneath the separating piston thereby prevents the oils from foaming above the piston. Rebound phase:When the car swings upwards, away from the road, the shock absorber is extended. Thereby, the piston rod is moving out of the damping case. The rebound phase valve at the lower piston resists the oil that flows downwards through the holes in the space above the piston. Therefore the upward motion is slowed down. |
Advantages of a KW coilover spring strut at one glance:
- Optimally adjusted KW suspension for any car class and any use – comfortable, sporty or performance-oriented
- High-quality components for long durability
- Innovative technology of the separately adjustable rebound- and compression damping
- Use of double-pipe technology, therefore separate adjustment of the damping forces for target-oriented influence of the car body vibrations and drive dynamics
- Pre-set suspension with all component parts, vehicle-specific certificate and plain assembly instruction
- Low weight
- noise-absorbing composite material reduces vibration sounds and isolates rolling noises from the car body
- absolutely corrosion-resistant
- Compression buffer/additional spring made of high-quality elastomer synthetic
- Integrated dust cap, protection from dirt, stone-chipping and splash water
- Highly resilient and low wear susceptibility
- Allows pre-stressing the main spring over the entire adjustment range
- Minimal total height and optimal force closure
- Weight- and construction space optimised spring constructions
- Multi-level tempering process (annealing, shot blasting, jigging, UV-test, phosphate coating, EPS coating) for optimal durability and minimised jigging characteristics
- noise-absorbing effect
- 100% corrosion-resistant in all environments
- Dirt-resistant trapezoid thread allows easy adjustment even when spring is pre-stressed
- noise-absorbing effect
- Visually appealing and unlimited durability
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Aluminium strut mount
 Adjustable strut mount made of high-strength aluminium are optionally available (where technically expedient) in our Clubsport suspensions. A special sealing system prevents the intrusion of dirt and splash water into the free-of-play pre-stressed uniball bearings and therefore prevents corrosion and wear.
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Polyamide ring nut
 The extremely light spring plates which are made of polyamide composite material are absolute corrosion-resistant and due to a trapezoid thread they can be even easily adjusted when the strut is pre-stressed.
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KW "inox-line" in detail
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| The salt spray test: In cooperation with the Technical University of Esslingen, a total of 9 products from 6 different manufacturers were subjected to quality testing in December of 2002 in the form of a salt spray durability test in accordance with DIN 50021 SS. The object of this testing was to compare corrosion resistance of the various systems under consideration of environmental influences such as salt water. During the test simulation of over 480 hours, the samples were inspected at regular intervals, whereby the corrosion resistance of piston rods and threaded struts were evaluated, as well as the adjustability of the aluminium spring collars. Participants/Products:
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| For each vehicle class and for every operational use, KW offers the optimal adjusted suspension, from comfortable, to sporty or performance-oriented. This demanding objective can only be achieved with the innovative, patented KW technology with an individually adjustable rebound- and compression damping. For this reason, we base our damping developments on double-pipe technology. With our 2-way pressure valve technology two, basically incompatible characteristics – dynamics & driving comfort – can be uniquely combined. Our Variant 3 allows adjusting the rebound damping forces completely separately from the compression adjustment. This allows optimising the vehicle connection to the road if required. The determining factor for the overall adjustment is the fact that the compression- and rebound forces have no relation to each other – in other words: an alteration of the compression damping does not necessarily also involve an alteration of the rebound damping. |
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KW technology in detail
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KW 7-post dyno
The 7-post drive dynamics test stand provides testing facilities in the laboratory which ideally support subjective tests on the road and on the race track. The tests supersede a large part of the elaborate test drives which are performed in order to check the engine- or vehicle durability. Most of all for newly developed cars or such vehicles for which there is not any suspension concept available yet, those stages of development are very important. 4-post mode  Contact: Klaus Frank, Driving Dynamics / Damping Development |
