Regulable vibration damper
View Patent ↗A regulable vibration damper may comprise a cylinder barrel that contains hydraulic fluid in a sealed manner, a piston that can be moved axially within the cylinder barrel along a cylinder barrel axis and that subdivides the cylinder barrel into two working chambers, a piston rod that is oriented parallel to the cylinder barrel axis and is connected to the piston, a valve assembly arranged at a fluid feed through to damp piston movement in an actuating direction, and a bypass duct between the two working chambers. The bypass duct may comprise a first throughflow cross section for a first throughflow direction, wherein the first throughflow cross section differs from a second throughflow cross section for a second throughflow direction. Further, the bypass duct may be formed, at least in part, by an outflow passage that is arranged on an exit side of a pilot valve for adjusting pilot pressure.
1. A regulable vibration damper comprising:
a cylinder barrel that contains hydraulic fluid in a sealed manner;
a piston that is movable axially within the cylinder barrel along a cylinder-barrel axis and that subdivides the cylinder barrel into two working chambers;
a piston rod that is oriented parallel to the cylinder-barrel axis and that is connected to the piston;
a valve assembly disposed at a fluid feed-through of the piston to damp piston movement in an actuating direction; and
a bypass duct disposed between the two working chambers, the bypass duct comprising a first throughflow cross section for a first throughflow direction, wherein the first throughflow cross section differs from a second throughflow cross section for a second throughflow direction, wherein the bypass duct comprises an outflow passage that is disposed on an exit side of a pilot valve for adjusting a pilot pressure,
wherein the outflow passage is a first outflow passage that connects the pilot valve to a first working chamber of the two working chambers, the regulable vibration damper further comprising a first valve arrangement that includes a first outflow-passage bypass throttle and a first one-way valve connected in parallel with the first outflow-passage bypass throttle, wherein a blocking direction of the first one-way valve is oriented into the bypass duct from the first working chamber, and
further comprising a second valve arrangement disposed in a second outflow passage that connects the pilot valve to a second working chamber of the two working chambers, the second valve arrangement comprising a second out-flow passage bypass throttle and a second one-way valve connected in parallel with the second out-flow passage bypass throttle, wherein a blocking direction of the second one-way valve is oriented into the bypass duct from the second working chamber.
2. The regulable vibration damper of claim 1 wherein the valve assembly comprises a valve disk, wherein in a closed valve position the valve disk is seated on a valve seat and at least partially covers the fluid feed-through, wherein in an open valve position the valve disk is at least partially spaced apart from the valve seat, wherein the valve assembly further comprises a pilot-control chamber, wherein the valve disk is prestressed into the closed valve position by virtue of the pilot-control chamber being subjected to the pilot pressure that is adjustable by the pilot valve.
3. A regulable vibration damper comprising:
a cylinder barrel that contains hydraulic fluid in a sealed manner;
a piston that is movable axially within the cylinder barrel along a cylinder-barrel axis and that subdivides the cylinder barrel into two working chambers;
a piston rod that is oriented parallel to the cylinder-barrel axis and that is connected to the piston;
a first valve assembly disposed at a first fluid feed-through of the piston to damp piston movement in a first actuating direction;
a second valve assembly disposed at a second fluid feed-through of the piston to damp piston movement in a second actuating direction; and
a bypass duct disposed between the two working chambers, the bypass duct comprising a first throughflow cross section for a first throughflow direction, wherein the first throughflow cross section differs from a second throughflow cross section for a second throughflow direction, wherein the bypass duct comprises a first outflow passage and a second outflow passage disposed on an exit side of a pilot valve for adjusting a pilot pressure,
further comprising:
a first valve arrangement disposed in the first outflow passage, which connects the pilot valve to the first working chamber, wherein the first valve arrangement comprises a first outflow-passage bypass throttle and a first one-way valve connected in parallel with the first outflow-passage bypass throttle, wherein a blocking direction of the first one-way valve is oriented into the bypass duct from the first working chamber, and
a second valve arrangement disposed in the second outflow passage, which connects the pilot valve to the second working chamber, wherein the second valve arrangement comprises a second outflow-passage bypass throttle and a second one-way valve connected in parallel with the second outflow-passage bypass throttle, wherein a blocking direction of the second one-way valve is oriented into the bypass duct from the second working chamber.
4. The regulable vibration damper of claim 3 wherein each of the first and second valve assemblies comprise a valve disk, wherein in a closed valve position the respective valve disk is seated on a valve seat and at least partially covers the respective fluid feed-through, wherein in an open valve position the respective valve disk is at least partially spaced apart from the valve seat, wherein each of the first and second valve assemblies further comprises a pilot-control chamber, wherein the valve disk is prestressed into the closed valve position by virtue of the respective pilot-control chamber being subjected to the pilot pressure that is adjustable by the pilot valve.