# US 10,369,859 B2 · Motor vehicle chassis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,369,859 B2 - Document ID: US10369859B2 - Status: Granted - Kind: B2 - Application number: 15/977,044 - Filed: 2018-05-11 - Published: 2018-09-13 - Granted: 2019-08-06 - Earliest claimed: 2015-11-13 - Assignees: Hoerbiger Automotive Komfortsysteme GmbH - Applicants: Hoerbiger Automotive Komfortsysteme GmbH - Inventors: Klaus Stolle; Gerhard Huber; Gisela Schleich; Jürgen Osterried; Peter Müller - Web page: https://patentgrep.com/patent/US10369859B2 ## CPC - B60G 17/0272: {the mechanical spring being a coil spring} - B60G 15/02: having mechanical spring - B60G 15/06: and fluid damper - B60G 17/0152: {characterised by the action on a particular type of suspension unit (B60G17/01941 takes precedence)} - B60G 2202/12: Wound spring - B60G 2202/30: Spring/Damper and/or actuator Units - B60G 2202/32: The spring being in series with the damper and/or actuator - B60G 2202/413: Hydraulic actuator - B60G 2500/30: Height or ground clearance - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) ## Abstract In a motor vehicle chassis, at least one wheel suspension, which comprises a spring in the form of a coil spring, has associated therewith a hydraulic height adjustment device having a cylinder-piston arrangement which acts on a base point of the coil spring. The cylinder-piston arrangement can be supplied by a decentral hydraulic aggregate which is associated with the relevant wheel and comprises a storage container for hydraulic fluid and a hydraulic pump driven by an electric motor. At least the electric motor of the hydraulic aggregate is situated within the coil spring. ## Claims ### Claim 1 A motor vehicle chassis comprising: a basic structure (1) and several one wheel suspension assemblies, wherein at least a first one wheel suspension assembly is provided with a spring (3), constructed as a coil spring (2), wherein furthermore a hydraulic height-positioning device is associated with the first one wheel suspension assembly, with, acting on a foot point (4) of the coil spring (2) and comprising a hydraulic working chamber (18), a cylinder-piston arrangement (20), which can be pressurized by a decentralized hydraulic aggregate (21) comprising a storage container (19) for hydraulic fluid and a hydraulic pump (25) driven by an electric motor (22), wherein at least the electric motor (22) of the hydraulic aggregate (21) is disposed within the coil spring (2), wherein the hydraulic working chamber (18) of the hydraulic cylinder-piston arrangement (20) annularly surrounds the electric motor (22) of the hydraulic aggregate (21) and/or its hydraulic pump (25); and wherein the hydraulic-fluid storage container (19) is constructed annularly, surrounds the electric motor (22) of the hydraulic aggregate (21) and/or its hydraulic pump (25), and has a volume that varies inversely relative to the volume of the hydraulic working chamber (18) of the cylinder-piston arrangement (20), and wherein the hydraulic working chamber is located below the hydraulic-fluid storage container in the cylinder-piston arrangement. ### Claim 2 (depends on 1) The motor vehicle chassis of claim 1, wherein the hydraulic pump (25) of the hydraulic aggregate (21) is also disposed within the coil spring (2). ### Claim 3 (depends on 1) The motor vehicle chassis of claim 1, wherein the hydraulic-fluid storage container (19) is also disposed within the coil spring (2). ### Claim 4 (depends on 1) The motor vehicle chassis of claim 1, wherein the hydraulic height-positioning device comprises a complex electrohydraulic positioning assembly (5) comprising the hydraulic aggregate (21) and the cylinder-piston arrangement (20). ### Claim 5 (depends on 4) The motor vehicle chassis of claim 4, wherein the electrohydraulic positioning assembly (5) comprises an adapter (6), in which the cylinder-piston arrangement (20) is integrated in such a way that no exposed hydraulic lines of any kind exist between the hydraulic pump (25) and the cylinder-piston arrangement (20). ### Claim 6 (depends on 5) The motor vehicle chassis of claim 5, wherein a pump housing of the hydraulic pump (25) is integrated in the adapter (6) in such a way that a pump rotor (26) rotates in a cavity (27) constructed in the adapter (6). ### Claim 7 (depends on 5) The motor vehicle chassis of claim 5, wherein the adapter (6) comprises a base member (7) and an actuating portion (8), which is guided displaceably thereon and is provided with a spring seat (9). ### Claim 8 (depends on 7) The motor vehicle chassis of claim 7, wherein the base member (7) comprises a housing portion (11) and an adapter core (12) received therein. ### Claim 9 (depends on 8) The motor vehicle chassis of claim 8, wherein hydraulic fluid ducts (30) are constructed in the separating face between the adapter core (12) and the housing portion (11). ### Claim 10 (depends on 7) The motor vehicle chassis of claim 7, wherein the cylinder-piston arrangement (20) comprises an annular working chamber (18) constructed between the base member (7) and the actuating portion (8). ### Claim 11 (depends on 7) The motor vehicle chassis of claim 7, wherein the base member (7) of the adapter (6) is joined to the basic structure (1) of the motor vehicle chassis. ### Claim 12 (depends on 5) The motor vehicle chassis of claim 5, wherein the hydraulic-fluid storage container (19) is integrated in the adapter (6). ### Claim 13 (depends on 1) The motor vehicle chassis of claim 1, wherein the hydraulic aggregate (21) is surrounded at least partly by a protective tube (33). ### Claim 14 (depends on 13) The motor vehicle chassis of claim 13, wherein the protective tube (33) is movable relative to the hydraulic aggregate (21).