# US 8,770,161 B2 · Valve lift device for a combustion engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,161 B2 - Document ID: US8770161B2 - Status: Granted - Kind: B2 - Application number: 13/641,609 - Filed: 2011-04-12 - Published: 2013-02-07 - Granted: 2014-07-08 - Earliest claimed: 2010-04-19 - Assignees: Scania CV AB - Applicants: Niclas Gunnarsson - Inventors: Niclas Gunnarsson - Web page: https://patentgrep.com/patent/US8770161B2 ## CPC - F01L 1/181: {Centre pivot rocking arms} - F01L 1/146: {Push-rods} - F01L 13/0036: {the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction} - F01L 13/0047: {the movement of the valves resulting from the sum of the simultaneous actions of at least two cams, the cams being independently variable in phase in respect of each other} - F01L 13/0063: {by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot} - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES ## Abstract A valve lift device for a combustion engine, a camshaft (5), a first unit (16) with a first contact device (9) in contact with a guide surface on the camshaft (5), a motion-transmitting mechanism converting the lifting movement of the unit (16) to a lift of at least one valve (3) of the combustion engine. An adjusting device (20-22) allows linear movements of the first unit (16) and hence of the first contact device (9) in a plane which is perpendicular to the camshaft's rotational axis (5a) between at least a first position of contact (9a1) with the guide surface (6) and a second position of contact (9a2) with the guide surface (6). ## Claims ### Claim 1 A valve lift device for a combustion engine, the valve lift device comprising: a camshaft having a rotational axis; a first guide surface on the camshaft, a first protruding portion on the first guide surface; a first unit comprising a first contact device in contact with the first guide surface, the first unit is configured and operable for undergoing a lifting movement when the first contact device comes into contact with the first protruding portion of the first guide surface; a motion-transmitting mechanism configured and operable for converting the lifting movement of the first unit for lifting at least one valve of the combustion engine; an adjusting device configured and operable for allowing linear movements of the first unit causing linear movement of the first contact device in a plane perpendicular to the camshaft's rotational axis, between at least a first contact position of the first contact device on the first guide surface and a second contact position of the first contact device on the guide surface; a second guide surface on the camshaft, a second protruding portion on the second guide surface; a second unit comprising a second contact device in contact with the second guide surface on the camshaft, the second unit is configured and operable for undergoing a lifting movement when the second contact device comes into contact with the second protruding portion of the second guide surface; wherein the first and second units are connected to the motion-transmitting mechanism in such a configuration that the one of the first and second units which at the time undergoes the higher lift of its guide surface transmits that lift to the valve; wherein one of the units is directly connected to the motion-transmitting mechanism and the other unit comprises a contact portion entering into engagement with a contact portion of the directly connected unit for lifting the directly connected unit when the other unit undergoes a higher lift of the respective guide surface thereof than the guide surface of the directly connected unit. ### Claim 2 (depends on 1) A valve lift device according to claim 1, wherein each of the first and the second guide surfaces have a respective periphery in contact with the first and second contact devices. ### Claim 3 (depends on 2) A valve lift device according to claim 2, wherein the first guide surface and the second guide surface are of identical peripheral shape. ### Claim 4 (depends on 1) A valve lift device according to claim 1, wherein the adjusting device comprises a pivotable control spindle which is parallel with the camshaft and is connected to the first unit via an articulated connection which is situated at a radial distance from the control spindle. ### Claim 5 (depends on 4) A valve lift device according to claim 4, wherein the adjusting device further comprises a power unit configured and operable for turning the control spindle to a selected rotational position, and a control unit which controls operation of the power unit on the basis of information concerning operation of the combustion engine. ### Claim 6 (depends on 1) A valve lift device according to claim 1, wherein the contact device of the second unit is always in contact with the second guide surface. ### Claim 7 (depends on 1) A valve lift device according to claim 1, wherein the valve lift device comprises a second adjusting device configured and operable for allowing linear movements of the second unit and of the second contact device in a plane which is perpendicular to the camshaft's rotational axis between at least two contact positions on the guide surface. ### Claim 8 (depends on 1) A valve lift device according to claim 1, wherein the contact devices each comprise a respective roller device configured and operable for rolling along the respective guide surfaces. ### Claim 9 A valve lift device for a combustion engine, the valve lift device comprising: a camshaft having a rotational axis; a first guide surface on the camshaft, a first protruding portion on the first guide surface; a first unit comprising a first contact device in contact with the first guide surface, the first unit is configured and operable for undergoing a lifting movement when the first contact device comes into contact with the first protruding portion of the first guide surface; a motion-transmitting mechanism configured and operable for converting the lifting movement of the first unit for lifting at least one valve of the combustion engine; an adjusting device configured and operable for allowing linear movements of the first unit causing linear movement of the first contact device in a plane perpendicular to the camshaft's rotational axis, between at least a first contact position of the first contact device on the first guide surface and a second contact position of the first contact device on the guide surface; a second guide surface on the camshaft, a second protruding portion on the second guide surface; a second unit comprising a second contact device in contact with the second guide surface on the camshaft, the second unit is configured and operable for undergoing a lifting movement when the second contact device comes into contact with the second protruding portion of the second guide surface; wherein the valve lift device comprises a second adjusting device configured and operable for allowing linear movements of the second unit and of the second contact device in a plane which is perpendicular to the camshaft's rotational axis between at least two contact positions on the guide surface.