# US 10,865,847 B2 · Damping valve comprising a direction-dependent pilot opening cross-section for a vibration damper > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,847 B2 - Document ID: US10865847B2 - Status: Granted - Kind: B2 - Application number: 16/319,144 - Filed: 2017-06-19 - Published: 2019-08-29 - Granted: 2020-12-15 - Earliest claimed: 2016-07-21 - Assignees: ZF Friedrichshafen AG - Applicants: Zf Friedrichshafen AG - Inventors: Harun Tucovic; Oswald Lichtlein; Eberhard Simon; Helmut Baalmann - Web page: https://patentgrep.com/patent/US10865847B2 ## CPC - F16F 9/3484: {characterised by features of the annular discs per se, singularly or in combination} - F16F 9/3488: {characterised by features intended to affect valve bias or pre-stress} - F16K 3/029: {with two or more gates} - F16K 3/10: with special arrangements for separating the sealing faces or for pressing them together - F16F 2226/048: Welding - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} ## Abstract A damping valve includes a valve body has at least one through-flow channel for each flow direction of a damping medium through the valve body. Each through-flow channel connects an inlet to an outlet. a valve disk covers the through-flow channels at the outlet opening the valve disk has a first volume flow of the damping medium through the valve body, at least one pre-orifice in the valve disk and at least one pre-orifice throttle arrangement is arranged at least indirectly adjoining the valve disk and adapted to at least partially cover or open the pre-orifice depending on the flow direction of a damping medium. The pre-orifice throttle arrangement includes multiple structural component parts arranged coaxial to one another, at least two of the structural component parts are inseparably connected to one another. ## Claims ### Claim 1 A damping valve, comprising: an inlet opening; an outlet opening a valve body having at least one through-flow channel for each flow direction of a damping medium through the valve body, wherein each through-flow channel connects the inlet opening to the outlet opening; at least one valve disk configured to cover the at least one through-flow channel for each flow direction at the outlet opening, wherein the at least one valve disk is configured for a first volume flow of the damping medium through the valve body; at least one pre-orifice formed in the at least one valve disk; at least one pre-orifice throttle arrangement arranged at least indirectly adjoining the at least one valve disk and configured to at least partially cover or open the at least one pre-orifice depending on the flow direction of a damping medium, and comprises: a plurality of structural component parts arranged coaxial to one another, wherein at least two of the plurality of structural component parts are inseparably connected to one another, wherein the pre-orifice throttle arrangement comprises: a radially outer spacer ring; a radially inner spacer ring; a first springing cover disk inseparably connected to the radially outer spacer ring by a bonding engagement and/or positive engagement; and a second springing cover disk. ### Claim 2 (depends on 1) The damping valve according to claim 1, wherein the first springing cover disk and the radially outer spacer ring are welded together. ### Claim 3 (depends on 1) Damping valve according to claim 1, wherein the pre-orifice throttle arrangement is formed such that an annular space, which is axially limited on one side by the first springing cover disk, is arranged between the radially inner spacer ring and the radially outer spacer ring, wherein the first springing cover disk at least partially extends radially over the radially inner spacer ring and the radially outer spacer ring. ### Claim 4 (depends on 1) The damping valve according to claim 1, wherein the second springing cover disk has a fastening portion proximate its center and an adjoining spring portion proximate its periphery, wherein the second springing cover disk is arranged in the pre-orifice throttle arrangement such that the fastening portion axially contacts the radially inner spacer ring and the adjoining spring portion projects into an annular space. ### Claim 5 (depends on 1) The damping valve according to claim 1, wherein an axial thickness of the radially outer spacer ring is equal to or greater than a sum of an axial thicknesses of the radially inner spacer ring and second springing cover disk. ### Claim 6 A Damping valve, comprising: an inlet opening; an outlet opening a valve body having at least one through-flow channel for each flow direction of a damping medium through the valve body, wherein each through-flow channel connects the inlet opening to the outlet opening; at least one valve disk configured to cover the at least one through-flow channel for each flow direction at the outlet opening, wherein the at least one valve disk is configured for a first volume flow of the damping medium through the valve body; at least one pre-orifice formed in the at least one valve disk; at least one pre-orifice throttle arrangement arranged at least indirectly adjoining the at least one valve disk and configured to at least partially cover or open the at least one pre-orifice depending on the flow direction of a damping medium, and comprises: a plurality of structural component parts arranged coaxial to one another, wherein at least two of the plurality of structural component parts are inseparably connected to one another, wherein the pre-orifice throttle arrangement comprises: a radially outer spacer ring; a radially inner spacer ring; a first springing cover disk inseparably connected to the radially inner spacer ring by a bonding engagement and/or positive engagement; and a second springing cover disk. ### Claim 7 (depends on 6) The damping valve according to claim 6, wherein the first springing cover disk and the radially inner spacer ring are welded together. ### Claim 8 (depends on 6) Damping valve according to claim 6, wherein the pre-orifice throttle arrangement is formed such that an annular space, which is axially limited on one side by the first springing cover disk, is arranged between the radially inner spacer ring and the radially outer spacer ring, wherein the first springing cover disk at least partially extends radially over the radially inner spacer ring and the radially outer spacer ring. ### Claim 9 (depends on 6) The damping valve according to claim 6, wherein the second springing cover disk has a fastening portion proximate its center and an adjoining spring portion proximate its periphery, wherein the second springing cover disk is arranged in the pre-orifice throttle arrangement such that the fastening portion axially contacts the radially inner spacer ring and the adjoining spring portion projects into an annular space. ### Claim 10 (depends on 6) The damping valve according to claim 6, wherein an axial thickness of the radially outer spacer ring is equal to or greater than a sum of an axial thicknesses of the radially inner spacer ring and second springing cover disk. ### Claim 11 A vibration damper comprising: a damping valve, comprising: an inlet opening; an outlet opening a valve body having at least one through-flow channel for each flow direction of a damping medium through the valve body, wherein each through-flow channel connects the inlet opening to the outlet opening; at least one valve disk configured to cover the at least one through-flow channel for each flow direction at the outlet opening, wherein the at least one valve disk is configured for a first volume flow of the damping medium through the valve body; at least one pre-orifice formed in the at least one valve disk; at least one pre-orifice throttle arrangement arranged at least indirectly adjoining the at least one valve disk and configured to at least partially cover or open the at least one pre-orifice depending on the flow direction of a damping medium, and comprises: a plurality of structural component parts arranged coaxial to one another, wherein at least two of the plurality of structural component parts are inseparably connected to one another, wherein the pre-orifice throttle arrangement comprises: a radially outer spacer ring; a radially inner spacer ring; a second springing cover disk; and a first springing cover disk inseparably connected to one of the radially outer spacer ring and the radially inner spacer ring by a bonding engagement and/or positive engagement.