# US 10,502,128 B2 · Hydraulic module with switch valve for controlling a hydraulic fluid flow of a connecting rod for an internal combustion engine with variable compression and connecting rod > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,128 B2 - Document ID: US10502128B2 - Status: Granted - Kind: B2 - Application number: 15/955,925 - Filed: 2018-04-18 - Published: 2018-11-08 - Granted: 2019-12-10 - Earliest claimed: 2017-05-04 - Assignees: ECO Holding 1 GmbH - Applicants: ECO Holding 1 GmbH - Inventors: Alexander Mudra; Dietmar Schulze; Wolfgang Rupp - Web page: https://patentgrep.com/patent/US10502128B2 ## CPC - F02B 75/045: {by means of a variable connecting rod length} - F02D 15/02: by alteration or displacement of piston stroke - F15B 11/16: with two or more servomotors - F15B 13/027: {Check valves} - F15B 15/06: for mechanically converting rectilinear movement into non- rectilinear movement - F16C 7/06: Adjustable connecting-rods - F16K 11/07: with cylindrical slides - F16K 15/142: {the closure elements being shaped as solids of revolution, e.g. toroidal or cylindrical rings} - F16K 15/145: {the closure elements being shaped as a solids of revolution, e.g. cylindrical or conical} - F15B 2211/30505: Non-return valves, i.e. check valves - F15B 2211/30525: Directional control valves, e.g. 4/3-directional control valve - F15B 2211/3059: having multiple valves for multiple output members - F15B 2211/41509: being connected to a pressure source and a directional control valve - F15B 2211/41545: being connected to multiple output members - F15B 2211/7107: the output members being mechanically linked - F16C 2360/22: Internal combustion engines - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - 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 hydraulic module with a switch valve for controlling a flow of a hydraulic fluid in a connecting rod for an internal combustion engine with variable compression with an eccentric element adjustment arrangement for adjusting an effective connecting rod length, wherein the eccentrical element adjustment arrangement includes a first cylinder and a second cylinder configured as hydraulic chambers, wherein a first inlet is provided for feeding the hydraulic fluid into the first cylinder and a second inlet is provided for feeding the hydraulic fluid into the second cylinder, wherein a first outlet is provided for draining the hydraulic fluid from the first cylinder and a second outlet is provided for draining the hydraulic fluid from the second cylinder wherein a first check valve is associated with the first cylinder and a second check valve is associated with the second cylinder. ## Claims ### Claim 1 A hydraulic module with a switch valve for controlling a flow of a hydraulic fluid in a connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment arrangement for adjusting an effective connecting rod length, wherein the eccentrical element adjustment arrangement includes a first cylinder and a second cylinder configured as hydraulic chambers, wherein a first inlet is provided for feeding the hydraulic fluid into the first cylinder and a second inlet is provided for feeding the hydraulic fluid into the second cylinder, wherein a first outlet is provided for draining the hydraulic fluid from the first cylinders and a second outlet is provided for draining the hydraulic fluid form the second cylinder, wherein a first check valve is associated with the first cylinder and a second check valve is associated with the second cylinder, wherein the first check valve is arranged in the first inlet and facilitates feeding the hydraulic fluid into the first cylinder and prevents draining the hydraulic fluid from the first cylinder, wherein the second check valve is arranged in the second inlet and facilitates feeding the hydraulic fluid into the second cylinder and prevents draining the hydraulic fluid from the second cylinder, wherein the switch valve includes a piston which is displaceable into a first switching position or a second switching position, and wherein the first cylinder and the second cylinder are connected so that hydraulic fluid is conductible in the first switching position from the first cylinder into the second cylinder, and wherein a supply conduit from the switch valve into a bearing shell of the connecting rod includes a second aperture configured as a second throttle through which the hydraulic fluid can drain in a throttled manner and is suction feedable in a throttled manner in the first switching position. ### Claim 2 (depends on 1) The hydraulic module according to claim 1, wherein the hydraulic fluid is conductible in the second switching position from the second cylinder into the first cylinder. ### Claim 3 (depends on 1) The hydraulic module according to claim 1, wherein the outlet of the second cylinder includes at least one first aperture configured as a throttle. ### Claim 4 (depends on 1) The hydraulic module according to claim 1, wherein at least one of the first check valves or the second check valve or the at least one first aperture is integrated into the switch valve. ### Claim 5 (depends on 4) The hydraulic module according to claim 4, wherein at least one of the first check valve and the second check valve includes an essentially annular band element with a circumference and configured as a closure element, wherein the essentially annular band element envelops the housing of the switch valve at least partially with the circumference and is at (east partially supported at the housing and closes at least one opening of the housing in a closed position of the check valve. ### Claim 6 (depends on 5) The hydraulic module according to claim 5, wherein the at least one first check valve and the at least one second check valve opens in a radially outward direction. ### Claim 7 (depends on 1) The hydraulic module according to claim 1, wherein the switch valve is configured as a 3/2 way valve. ### Claim 8 (depends on 1) The hydraulic module according to claim 1, wherein the first inlet and the first outlet of the first cylinder is configured as a conduit in the switch valve, or wherein the second inlet and the second outlet of the second cylinder is configured as a conduit in the switch valve. ### Claim 9 (depends on 1) A connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment device for adjusting an effective connecting rod length with a hydraulic module according to claim 1. ### Claim 10 A hydraulic module with a switch valve for controlling a flow of a hydraulic fluid in a connecting rod for an internal combustion engine with variable compression with an eccentrical element adjustment arrangement for adjusting an effective connecting rod length, wherein the eccentrical element adjustment arrangement includes a first cylinder and a second cylinder configured as hydraulic chambers, wherein a first inlet is provided for feeding the hydraulic fluid into the first cylinder and a second inlet is provided for feeding the hydraulic fluid into the second cylinder, wherein a first outlet is provided for draining the hydraulic fluid from the first cylinders and a second outlet is provided for draining the hydraulic fluid form the second cylinder, wherein a first check valve is associated with the first cylinder and a second check valve is associated with the second cylinder, wherein the first check valve is arranged in the first inlet and facilitates feeding the hydraulic fluid into the first cylinder and prevents draining the hydraulic fluid from the first cylinder, wherein the second check valve is arranged in the second inlet and facilitates feeding the hydraulic fluid into the second cylinder and prevents draining the hydraulic fluid from the second cylinder, wherein the switch valve includes a piston which is displaceable into a first switching position or a second switching position, and wherein the first cylinder and the second cylinder are connected so that hydraulic fluid is conductible in the first switching position from the first cylinder into the second cylinder, wherein a supply conduit of the switch valve includes a second aperture configured as a second throttle through which the hydraulic fluid can drain in a throttled manner and is suction feedable in a throttled manner in the first switching position and wherein a third check valve is provided in the supply conduit parallel to the second aperture wherein the third check valve facilitates feeding hydraulic fluid into the switch valve and prevents an outflow of the hydraulic fluid. ### Claim 11 (depends on 10) The hydraulic module according to claim 10, wherein the third check valve includes an essentially annular band element configured as a closure element which is at least partially supported at a housing of the switch valve and which closes at least one first opening of the housing in a closed position of the check valve. ### Claim 12 (depends on 11) The hydraulic module according to claim 11, wherein the check valve is arranged in an interior of the housing of the switch valve and opens in a radially inward direction. ### Claim 13 (depends on 11) The hydraulic module according to claim 11, wherein the essentially annular band element includes a radial bore hole that is configured as the second aperture and arranged on a circumference of the essentially annular band element. ### Claim 14 (depends on 11) The hydraulic module according to claim 11, wherein the essentially annular band element (46) includes a notch that is oriented towards a circumference of the essentially annular band element (46) and configured as the second aperture (19). ### Claim 15 (depends on 11) The hydraulic module according to claim 11, wherein the housing includes a notch oriented towards a circumference of the band element and configured as the second aperture. ### Claim 16 (depends on 10) The hydraulic module according to claim 10, wherein the aperture and the third check valve are provided as a combined element. ### Claim 17 (depends on 10) The hydraulic module according to claim 10, wherein the third check valve is configured as a ball check valve and arranged in the housing of the switch valve and the housing includes a notch that extends parallel to a hydraulic fluid path of the check valve and that is configured as the second aperture.