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Impact damper for motor vehicles, the impact damper having two tubes which can be pushed one inside the other, the inner tube consisting of a first and second fluid chamber and a gas chamber separated from the first fluid chamber by a separating piston. A third fluid chamber, separated from the seco

Impact damper for motor vehicles, the impact damper having two tubes which can be pushed one inside the other, the inner tube consisting of a first and second fluid chamber and a gas chamber separated from the first fluid chamber by a separating piston. A third fluid chamber, separated from the second fluid chamber by a work piston can extend the tubes relative to one another by changing the pressure within the fluid chambers.

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A system for increasing impact absorbtion ability between a motor vehicle and an obstacle, said system comprising: a motor vehicle with a bumper and an impact damper disposed between the bumper and the motor vehicle, said impact damper comprising an inner tube and an outer which can be pushed one in

A system for increasing impact absorbtion ability between a motor vehicle and an obstacle, said system comprising: a motor vehicle with a bumper and an impact damper disposed between the bumper and the motor vehicle, said impact damper comprising an inner tube and an outer which can be pushed one into the other, said inner tube having a first end disposed away from said outer tube, and said inner tube comprising: a work piston, the work piston having a first side disposed towards the first end of said inner tube and a second side opposite the first side; a piston rod connecting said work piston to said outer tube, a first fluid chamber disposed adjacent the first side of said work piston; a second fluid chamber disposed adjacent the second side of said work piston; means for pressurizing at least said first fluid chamber; electrically controlled control valve means disposed between said first and second fluid chambers for placing said first and second fluid chambers in communication with one another, said control valve means being configured for opening and closing the communication to control flow of fluid between said first and second fluid chambers; said impact damper having a base configuration of said inner and outer tubes and an extended configuration of said inner and outer tubes, said inner and outer tubes being configured to be extended from the base configuration, a defined axial distance with respect to one another, into the extended configuration when said communication is opened between the first fluid chamber and the second fluid chamber, said impact damper being configured for adsorbing a first impact energy in the base configuration and a second impact energy in said extended configuration, the second impact energy being greater than the first impact energy; means for electrically controlling the control valve means to open and close the communication between the first and second fluid chambers; means for electrically operating said means for controlling to extend said impact damper into the extended configuration under predetermined operating conditions of the motor vehicle; said impact damper comprises mounting brackets for mounting said impact damper to the motor vehicle; a fluid supply reservoir for supplying fluid to said first and second fluid chambers; pump means for supplying fluid from the fluid reservoir to said impact damper; said outer tube having a first and disposed away from the inner tube; said piston rod extending from the second side of said work piston to the first end of said outer tube; said piston rod comprising a longitudinal passage extending from said control valve means to the first end of said outer tube; said longitudinal passage being configured to be connected to said pump means for passage of fluid therethrough; said longitudinal passage further comprising means for electrically connecting said control valve means to said means for controlling said control valve means; said means for controlling said control valve means further comprising means for controlling said pump means; said impact damper in said base configuration has a first length, said impact damper in said extended configuration has a second length, and said second length is about 100 mm longer than said first length; said predetermined speed of the motor vehicle is about 8 km/hr; said impact damper in said base configuration is configured for absorbing an impact energy between the motor vehicle and the obstacle at impact speeds of up to about 8 km/hr; and said impact damper in said extended configuration is configured for absorbing an impact energy between the motor vehicle and the obstacle at impact speeds of up to about 15 km/hr.