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US 5,207,300 AGranted
Hydraulic, adjustable vibration damper for motor vehicles
AssigneeBoge GmbH
InventorsWalter Engel, Werner Sczepanski
Life of this patent
Estimating the term…
Abstract
Hydraulic, adjustable vibration damper, such as for motor vehicles, in which, parallel to the damping valves, there is a bypass whose control body can be closed by a simple hydraulically or pneumatically pressurized adjustment apparatus, and opened by the internal system pressure of the vibration damper. For this purpose, the control body is equipped with a pressure intensifier, whereby on its external circumferential surface, an annular surface is created by a smaller-diameter portion for the application of the system internal pressure.
Claims20
A hydraulic vibration damper with adjustable damping with a hydraulic cylinder filled with damping fluid, said vibration damper comprising:
- piston means comprising a piston fastened to a piston rod, said piston means being disposed in said hydraulic cylinder, said piston having valves, said piston dividing said cylinder into two chambers, said piston rod having a longitudinal axis;
- bypass means disposed to bypass damping fluid about said valves of said piston means, said bypass means having valve means, said valve means being disposed parallel to said valves of said piston, said valve means comprising at least one valve which is pressure controlled by a pressure medium originating externally of the vibration damper;
- means for providing said external pressure medium to said valve means;
- said at least one externally pressure-controlled valve comprising an orifice and a movable body, said movable body being disposed for opening and closing said orifice for bypassing damping fluid during adjusting operation of said vibration damper;
- said movable body being movable by said external pressure medium, said external pressure medium for being controlled by external pressure adjustment means;
- means for transmitting pressure disposed between said external pressure medium providing means and said movable body, said means for transmitting pressure being movable in said piston means;
- said movable body having an outermost circumferential surface;
- said outermost circumferential surface having a first outer cylindrical portion and a second outer cylindrical portion;
- said first outer cylindrical portion having a first diameter;
- said second outer cylindrical portion having a second diameter;
- said second diameter being smaller than said first diameter;
- said first outer cylindrical portion and second outer cylindrical portion being coaxial;
- at least a portion of said second outer cylindrical portion not being overlapped by any portion of said first outer cylindrical portion;
- said first outer cylindrical portion being disposed between said means for transmitting pressure and said at least a portion of said second outer cylindrical portion;
- said second outer cylindrical portion being configured to be selectively disposable to open and close said orifice;
- said outermost circumferential surface having a third outer portion;
- said third outer portion joining said first outer cylindrical portion and said second outer cylindrical portion;
- said third outer portion being configured to be acted upon by pressure from the damping fluid to assist in opening said orifice;
- and
- means for guiding said first outer cylindrical portion by said first outer cylindrical portion slidably moving within said means for guiding to thereby permit opening and closing of said orifice.
17 more elements
A hydraulic vibration damper with adjustable damping with a hydraulic cylinder filled with damping fluid, said vibration damper comprising:
- piston means comprising a piston fastened to a piston rod, said piston means being disposed in said hydraulic cylinder, said piston having valves, said piston dividing said cylinder into two chambers, said piston rod having a longitudinal axis;
- bypass means disposed to bypass damping fluid about said valves of said piston means, said bypass means having valve means, said valve means being disposed parallel to said valves of said piston, said valve means comprising at least one valve which is pressure-controlled;
- said at least one pressure-controlled valve comprising an orifice and a movable body, said movable body being disposed for opening and closing said orifice during adjusting operation of said vibration damper;
- said movable body being pressurized by a pressure medium, said pressure medium originating external to the hydraulic cylinder;
- means for conducting pressure of said pressure medium, originating external to the hydraulic cylinder, to said movable body;
- said movable body having an outermost circumferential surface;
- said outermost circumferential surface having a first outer cylindrical portion and a second outer cylindrical portion;
- said first outer cylindrical portion having a first diameter;
- said second outer cylindrical portion having a second diameter;
- said second diameter being smaller than said first diameter;
- said first outer cylindrical portion and second outer cylindrical portion being coaxial;
- at least a portion of said second outer cylindrical portion not being overlapped by any portion of said first outer cylindrical portion;
- said first outer cylindrical portion being disposed between said means for conducting pressure and said at least a portion of said second outer cylindrical portion;
- said second outer cylindrical portion being configured to be selectively disposable to cover said orifice;
- said outermost circumferential surface having a third outer portion;
- said third outer portion comprising an annular surface extending from said second outer cylindrical portion to said first outer cylindrical portion;
- said third outer portion being configured to be acted upon by pressure from the damping fluid to assist in opening said orifice;
- and
- means for guiding said first outer cylindrical portion by said first outer cylindrical portion slidably moving within said means for guiding to thereby permit opening and closing of said orifice.
16 more elements
Dependencies are inferred from the claim text.