# US 5,346,192 A · Hydraulic bearing with electromagnetically compensated chambers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,192 A - Document ID: US5346192A - Status: Granted - Kind: A - Application number: 08/014,964 - Filed: 1993-02-08 - Granted: 1994-09-13 - Earliest claimed: 1992-02-12 - Assignees: Firma Carl Freudenberg - Inventors: Uwe Weltin; Ulrich Freudenberg; Tillman Freudenberg - Web page: https://patentgrep.com/patent/US5346192A ## CPC - F16F 13/264: {comprising means for acting dynamically on the walls bounding a working chamber} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract A rubber bearing, in which a liquid-filled working chamber is bounded by an expanding member and by a compensating wall that is capable of moving back and forth in the direction of the working chamber, wherein the compensating wall consists at least partially of a material that is capable of being moved by magnetic forces and extends relatively movably with one partial area into an air gap between a pair of coils comprised of two mutually opposing magnetic coils, which are rigidly supported in two coil braces and are capable of receiving an electric alternating current. The magnetic fluxes of the magnetic coils in the air gap are superimposed upon the magnetic flux of at least one permanent magnet, and the magnetic coils synchronously receive an electric current in such a way that the magnetic flux generated by the permanent magnet is strengthened on one side of the compensating wall and weakened on the other side of the compensating wall. ## Claims ### Claim 1 A rubber bearing comprising: a liquid-filled working chamber bounded by a compensating wall comprised at least partially of a material that is capable of being moved by magnetic forces and capable of moving back and forth in the direction of said working chamber; a first magnetic coil and a second magnetic coil, each of which is capable of receiving an electric alternating current, wherein the first magnetic coil is oriented to generate a first alternating magnetic flux and the second magnetic coil is oriented to generate a second alternating magnetic flux; and a permanent magnet arrangement, comprising at least one permanent magnet, generating a permanent magnet magnetic flux, whereby said permanent magnet arrangement is oriented so that the first alternating magnetic flux strengthens the permanent magnet magnetic flux on one side of said compensating wall and the second alternating magnetic flux weakens the permanent magnet magnetic flux on an opposite side of said compensating wall. ### Claim 2 (depends on 1) The rubber bearing according to claim 1, wherein said liquid-filled working chamber is also bounded by a resilient expanding member. ### Claim 3 (depends on 2) The rubber bearing according to claim 2, wherein each of said first and second magnetic coils is rigidly supported in a coil brace. ### Claim 4 (depends on 3) The rubber bearing according to claim 3, wherein said permanent magnet arrangement comprises at least one partial magnet which is embedded in said compensating wall. ### Claim 5 (depends on 3) The rubber bearing according to claim 3, wherein said permanent magnet arrangement is comprised of two partial magnets each of which is combined with one of said first and second magnetic coils to make up a unit. ### Claim 6 (depends on 2) The rubber bearing according to claim 2, wherein said permanent magnet arrangement comprises at least one partial magnet which is embedded in said compensating wall. ### Claim 7 (depends on 2) The rubber bearing according to claim 2, wherein said permanent magnet arrangement is comprised of two partial magnets each of which is combined with one of said first and second magnetic coils to make up a unit. ### Claim 8 (depends on 7) The rubber bearing according to claim 7, wherein each of said units further comprises a coil brace for supporting said partial magnet and said magnetic coil. ### Claim 9 (depends on 8) The rubber bearing according to claim 8, wherein each of said coil braces comprises a magnetically attracted part. ### Claim 10 (depends on 7) The rubber bearing according to claim 7, wherein each of said partial magnets has a curved shape and supports one of said first and second magnetic coils. ### Claim 11 (depends on 2) The rubber bearing according to claim 2, wherein said compensating wall further comprises an annual partial area around its periphery which extends between said first and second magnetic coils. ### Claim 12 (depends on 1) The rubber bearing according to claim 1, wherein each of said first and second magnetic coils is rigidly supported in a coil brace. ### Claim 13 (depends on 12) The rubber bearing according to claim 12, wherein said permanent magnet arrangement comprises at least one partial magnet which is embedded in said compensating wall. ### Claim 14 (depends on 12) The rubber bearing according to claim 12, wherein said permanent magnet arrangement is comprised of two partial magnets each of which is combined with one of said first and second magnetic coils to make up a unit. ### Claim 15 (depends on 1) The rubber bearing according to claim 1, wherein said permanent magnet arrangement comprises at least one partial magnet which is embedded in said compensating wall. ### Claim 16 (depends on 1) The rubber bearing according to claim 1, wherein said permanent magnet arrangement is comprised of two partial magnets each of which is combined with one of said first and second magnetic coils to make up a unit. ### Claim 17 (depends on 16) The rubber bearing according to claim 16, wherein each of said units further comprises a coil brace for supporting said partial magnet and said magnetic coil. ### Claim 18 (depends on 17) The rubber bearing according to claim 17, wherein each of said coil braces comprises a magnetically attracted part. ### Claim 19 (depends on 16) The rubber bearing according to claim 16, wherein each of said partial magnets has a curved shape and supports one of said first and second magnetic coils. ### Claim 20 (depends on 1) The rubber bearing according to claim 1, wherein said compensating wall further comprises an annual partial area around its periphery which extends between said first and second magnetic coils.