Mannesmann Boge Gmbh

Fichtel & Sachs Ag

Metin Ayyildiz

Holger Kirchner

Wolfgang Dohrmann

Jorg Schmitz

An impact absorber for decelerating a vehicle during a collision with an obstacle by hydraulic damping forces and pneumatic spring forces includes two tubes that are telescopically displaceable one inside the other. An internal tube of the two tubes is closed off to the outside by a base. A gas space subjected to high pressure is disposed adjacent said base and interacts with a first liquid space via a separating piston which is axially guided in the internal tube in a sealed manner. The first liquid space is hydraulically connected to a second liquid space via a throttle opening through an intermediate wall attached inside the internal tube. A working piston attached to a piston rod is guided in the internal tube in a sealing manner and interacts via the piston rod with a third liquid space in an external one of the two tubes. A control which can be connected to two chambers is provided to extend the impact absorber or to return it to a normal position.

Impact absorber

An impact damper includes two tubes which are slidable one in the other for braking a vehicle impact against an obstacle by hydraulic damping forces and pneumatic spring forces. The inner tube is closed off by a bottom. A gas chamber containing a high pressure gas cushion is arranged adjacent to the bottom and bounded by a separating piston that is guided sealingly and displaceably in the inner tube. A first fluid chamber is arranged between the separating piston and a partition fixed in the inner tube and provided with choke openings. A second fluid chamber is formed by the outer tube and connected to the first fluid chamber via the partition. The outer tube has a tapering region directed away from the partition, and a deformation element dividing the second fluid chamber into two part chambers.

Impact damper

An impact absorber for decelerating a vehicle impacting on an obstacle, which impact absorber includes two tubes which can be displaced one inside the other in the manner of a telescope. The inner tube is closed off from the outside by a base and has a highly pressurized gas space and a first fluid space. A second fluid space is arranged in the outer tube and is hydraulically connected to the first fluid space via a restriction formed by a restricting aperture in an intermediate wall fixed in the inner tube. The outer tube has, in the end region, a plastic disk which melts at a predetermined temperature and as a result counteracts an explosion of the impact absorber in the event of a fire by reducing the pressure.

Impact-absorbing bumper mount with two telescoping tubes, in particular for motor vehicles, to decelerate a vehicle via damping forces when the vehicle strikes an obstacle, whereby a work piston is guided in a sealed manner in one of the tubes, and with which, in addition to a weight reduction, it is also possible to simplify the fabrication process, reduce costs and achieve sufficient corrosion protection. The invention teaches that this problem can be solved by tubes which have recesses on their inside and outside, and which are coated with a polymeric material.

Impact absorbing bumper mount and method of making

An impact-absorbing shock absorber with two telescoping tubes, in particular for motor vehicles, for decelerating, as a result of hydraulic damping forces and pneumatic spring forces, a vehicle which collides with an obstacle, has an inner tube closed by a bottom, a gas chamber adjacent to the bottom and containing a gas cushion at high pressure, a separating piston guided in a sealed manner so that it can move inside the inner tube, a first fluid chamber, a partition which has throttle openings, and a second fluid chamber which is connected via the throttle openings of the partition to the first fluid chamber. Above a defined energy absorption threshold, the partition is can be displaced from its original installed position toward the gas chamber, with an accompanying change in the shape of the inner tube.

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Koln, Germany

Metin Ayyildiz