초록 ▼

Vibration damper, in particular for motor vehicles, including a work cylinder, a work piston fastened to a piston rod and dividing the work cylinder into two work chambers, possibly an equalization chamber and a piston rod guide which seals the piston rod against the atmosphere, whereby the work cha

Vibration damper, in particular for motor vehicles, including a work cylinder, a work piston fastened to a piston rod and dividing the work cylinder into two work chambers, possibly an equalization chamber and a piston rod guide which seals the piston rod against the atmosphere, whereby the work chambers are filled with a magnetorheological fluid to which an electric coil can be applied. In the event of a failure or malfunction of the electric coil, it must be possible to achieve a safe damping force, by having at least one permanent magnetic field which acts on the magnetorheological fluid.

대표청구항 ▼

A vibration damper for damping vibrations of a suspension of a motor vehicle, said vibration damper comprising: a cylinder; a first end apparatus and a second end apparatus, said cylinder being disposed between said first end apparatus and said second end apparatus; means, provided at said first end

A vibration damper for damping vibrations of a suspension of a motor vehicle, said vibration damper comprising: a cylinder; a first end apparatus and a second end apparatus, said cylinder being disposed between said first end apparatus and said second end apparatus; means, provided at said first end apparatus of said vibration damper, for connecting said vibration damper to the body of a motor vehicle; means, provided at said second end apparatus of said vibration damper, for connecting said vibration damper to the suspension of a motor vehicle; damping fluid disposed within said cylinder; a piston rod projecting into said cylinder, said piston rod being movable axially within said cylinder; means for sealing said piston rod with respect to the atmosphere; a piston disposed on said piston rod, said piston dividing said cylinder into a first chamber and a second chamber; means for providing fluid communication between said first chamber and said second chamber; said damping fluid comprising a magnetorheological fluid increasing in viscosity in response to the application of at least one magnetic field thereto; said means for providing fluid communication between said first chamber and said second chamber comprising at least one flow channel; said at least one flow channel comprising: a depth in the direction of flow of said damping fluid in said at least one flow channel; a cross section, said cross section being substantially transverse to the direction of flow of said damping fluid; said cross section comprising: a first dimension; and a second dimension; and said first dimension of said cross section varies along said second dimension of said cross section; and means for providing at least one variable magnetic field to said magnetorheological fluid in said cross section to change the viscosity of said magnetorheological fluid in a selected portion of said cross section of said at least one flow channel.