Fluid operated oscillation damper

A fluid operated oscillation damper with an electromagnetically controlled valve unit for varying the damping force of said oscillation damper, said valve unit comprising a plurality of fluidic and electromagnetic valve unit components, at least part of said fluidic and electromagnetic valve unit components being accommodated within a valve unit compartment of said oscillation damper, said valve unit compartment being confined by compartment confining means, said compartment confining means comprising at least two housing units, one of said housing units being a basic housing unit attached to a part of said oscillation damper, a further one of said housing units being a cover unit attached to said basic housing unit, said cover unit being nonreleasably connected by nonreleasable connection means with said basic housing unit;

• said basic housing unit and said cover unit having a common axis, said cover unit accommodating an annular electromagnetic coil around said axis and an axially movable armature member inside a central space surrounded by said annular electromagnetic coil;
• said electromagnetic coil being provided with ferromagnetic core means substantially following a path substantially toroidally extending around said annular electromagnetic coil, said ferromagnetic core means comprising a ferromagnetic flange portion provided axially adjacent said annular electromagnetic coil and said basic housing unit;
• and
• said ferromagnetic core means further comprising a ferromagnetic jacket surrounding said annular electromagnetic coil and integral with a ferromagnetic end wall adjacent an end face of said annular electromagnetic coil remote from said ferromagnetic flange portion, said ferromagnetic jacket providing a portion of said cover unit nonreleasably connected to said basic housing unit.

A fluid operated oscillation damper with an electromagnetically controlled valve unit for varying the damping force of said oscillation damper, said valve unit comprising a plurality of fluidic and electromagnetic valve unit components, at least part of said fluidic and electromagnetic valve unit components being accommodated within a valve unit compartment of said oscillation damper, said valve unit compartment being confined by compartment confining means, said compartment confining means comprising at least two housing units, one of said housing units being a basic housing unit (431) attached to a part of said oscillation damper, a further one of said housing units being a cover unit, said cover unit being connected by connection means with said basic housing unit;

• said basic housing unit and said cover unit having a common axis, said cover unit accommodating an annular electromagnetic coil around said axis and an axially movable armature member inside a central space surrounded by said annular electromagnetic coil;
• said electromagnetic coil being provided with enveloping wall means substantially following a path extending substantially toroidally around said annular electromagnetic coil, said enveloping wall means comprising an annular intermediate wall member around and substantially orthogonal with respect to said common axis and located axially adjacent a transition zone between said annular electromagnetic coil and said basic housing unit;
• said enveloping wall means further comprising a jacket surrounding a radially outward face of said annular electromagnetic coil and integral with an end wall portion adjacent an end face of said annular electromagnetic coil remote from said annular intermediate wall member, said jacket providing a portion of said cover unit.