Hydraulic adjustable shock absorber

Claim 1

A shock absorber for motor vehicles, said shock absorber comprising a cylinder assembly having an arrangement for varying damping of a piston assembly disposed therein, said piston assembly dividing said cylinder into at least two chambers, each for containing damping fluid, said shock absorber comprising: means for throttling said damping fluid when said damping fluid moves from one of said chambers into another; said piston assembly having a piston rod and piston; said piston rod having first means for attachment of said piston rod at one end thereof; said cylinder assembly having second means for attachment at a portion thereon other than said first means for attachment at said piston rod; means for bypassing damping fluid; means for accepting bypassed damping fluid; said bypassing means being disposed to bypass said damping fluid from one of said damping fluid-containing chambers to said accepting means; said bypassing means including valving means for regulating flow of said damping fluid in said bypassing means; said valving means including: an electromagnetically-displaceable component for effecting flow cross section in said valving means, said electromagnetically-displaceable component having a first and a second end surface means; electromagnetic means for displacing said electromagnetically-displaceable component, said electromagnetic means having means for connection to electrical controlling means; valve seat means including a stationary seating surface means and a first portion of said first end surface means of said electromagnetically-displaceable component; said first portion of said first end surface means for making contact with said stationary seating surface means; said electromagnetically-displaceable component being axially displaceable along a first axis; said seating surface means having at least one portion being disposed substantially at a right angle to said first axis; a second portion of said first end surface means of said electromagnetically-displaceable component being disposed within said first portion of said first end surface means and a predetermined distance (E) away from said first portion of said first end surface means, to form a cavity; and said second portion of said first end surface means to form said cavity being disposed to form during flow of fluid through said valving means a pressure reduction to assist in closing said electromagnetically-displaceable component against said valve seat means.