# US 10,309,273 B2 · Variable valve duration/variable valve lift system and engine provided with the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,273 B2 - Document ID: US10309273B2 - Status: Granted - Kind: B2 - Application number: 15/266,912 - Filed: 2016-09-15 - Published: 2017-04-20 - Granted: 2019-06-04 - Earliest claimed: 2015-10-16 - Assignees: Hyundai Motor Company; Kia Motors Corporation - Applicants: Hyundai Motor Company; Kia Motors Corporation - Inventors: Kyung Mo Kim - Web page: https://patentgrep.com/patent/US10309273B2 ## CPC - F01L 13/0021: {by modification of rocker arm ratio} - F01L 1/053: overhead type - F01L 1/18: Rocking arms or levers - F01L 1/181: {Centre pivot rocking arms} - F01L 1/26: characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder (with coaxial valves F01L1/28) - F01L 1/267: {with means for varying the timing or the lift of the valves} - F01L 1/46: Component parts, details, or accessories, not provided for in preceding subgroups - F01L 13/00: Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations - F01L 13/0026: {by means of an eccentric} - F02D 13/0207: {changing valve lift or valve lift and timing} - F01L 2001/0535: {Single overhead camshafts [SOHC]} - F01L 2001/467: {Lost motion springs} - F01L 2013/10: {Auxiliary actuators for variable valve timing} - F01L 2305/00: Valve arrangements comprising rollers - Y02T 10/12: Improving ICE efficiencies - F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A variable valve duration/variable valve lift system may include a camshaft, a first cam portion including a first cam, into which the camshaft is inserted and of which a relative phase angle of the first cam with respect to the camshaft is variable, an inner bracket transmitting rotation of the camshaft to the first cam portion, a slider housing into which the inner bracket is rotatably inserted, a first rocker arm having a first end contacting the first cam, a rocker shaft to which the first rocker arm is rotatably connected, a solenoid valve configured to selectively supply hydraulic pressure, a position controller configured to selectively change a position of the slider housing, a first bridge connected to a second end of the first rocker arm and to which a first valve is connected, and a valve lift disposed within the first bridge. ## Claims ### Claim 1 A variable valve duration/variable valve lift system, comprising: a camshaft; a first cam portion including a first cam, into which the camshaft is inserted and of which a relative phase angle of the first cam with respect to the camshaft is variable; an inner bracket transmitting rotation of the camshaft to the first cam portion; a slider housing into which the inner bracket is rotatably inserted; a first rocker arm having a first end contacting the first cam; a rocker shaft to which the first rocker arm is rotatably connected; a solenoid valve configured to selectively supply hydraulic pressure; a position controller configured to selectively change a position of the slider housing according to the selective supplying of the hydraulic pressure supplied from the solenoid valve; a first bridge connected to a second end of the first rocker arm and to which a first valve is connected; and a valve lift disposed within the first bridge for changing valve lift of the first valve according to supplying of the hydraulic pressure supplied from the solenoid valve. ### Claim 2 (depends on 1) The variable valve duration/variable valve lift system of claim 1, wherein a control hydraulic line is formed on the rocker shaft; and wherein the solenoid valve and the position controller are fluidically-communicated with the control hydraulic line. ### Claim 3 (depends on 2) The variable valve duration/variable valve lift system of claim 2, wherein the position controller comprises: a controller housing on which a master valve hole is formed; and a master valve inserted into the master valve hole and moved according to the supplying of the hydraulic pressure from the solenoid valve to change a relative position of the slider housing with respect to the camshaft. ### Claim 4 (depends on 3) The variable valve duration/variable valve lift system of claim 3, wherein a lock pin hole is formed on the controller housing, and the position controller comprises: a lock pin disposed within the lock pin hole and selectively connectable to the master valve according to the supplying of the hydraulic pressure from the solenoid valve; and a return spring disposed within the lock pin hole and elastically supporting the lock pin. ### Claim 5 (depends on 4) The variable valve duration/variable valve lift system of claim 4, wherein a valve groove into which the lock pin is selectively inserted is formed on the master valve. ### Claim 6 (depends on 3) The variable valve duration/variable valve lift system of claim 3, wherein the controller housing is mounted to support the rocker shaft. ### Claim 7 (depends on 1) The variable valve duration/variable valve lift system of claim 1, wherein the valve lift comprises: a screw on which a screw oil hole connected to the first rocker arm is formed; a plunger slidable within the first bridge and on which a plunger oil hole communicated with the screw oil hole is formed; a plunger lock pin slidable within the first bridge and selectively connectable to the plunger according to supplying of hydraulic pressure from the plunger oil hole; a plunger return spring disposed within the first bridge and pushing against the plunger lock pin for the plunger lock pin to be connected to the plunger; a lost motion spring disposed within the first bridge and elastically supporting the plunger; and a swivel foot connecting the plunger with the screw. ### Claim 8 (depends on 1) The variable valve duration/variable valve lift system of claim 1, wherein a first slot and a second slot are formed on the inner bracket, and the first cam portion comprises a wheel on which a wheel key is formed and connected to the first cam, and wherein the variable valve duration/variable valve lift system further comprises: a connecting pin connected to the camshaft; a first slider pin on which a pin slot, where the wheel key is slidably inserted thereto along a length direction of the wheel key, is formed, the first slider pin being rotatably inserted into the first slot; and a second slider pin on which a pin hole, where the connecting pin is slidably inserted thereto along a length direction of the connecting pin, is formed, the second slider pin being rotatably inserted into the second slot. ### Claim 9 (depends on 8) The variable valve duration/variable valve lift system of claim 8, further comprising a bearing disposed between the slider housing and the inner bracket. ### Claim 10 (depends on 8) The variable valve duration/variable valve lift system of claim 8, further comprising: a first roller connected to a first end of the first rocker arm and contacting the first cam; and a first bridge connected to a second end of the first rocker arm, wherein two first valves are connected to the first bridge. ### Claim 11 (depends on 8) The variable valve duration/variable valve lift system of claim 8, further comprising an outer shaft on which a guide slot is formed, and to which the camshaft is inserted, wherein the first cam is connected to the outer shaft. ### Claim 12 (depends on 8) The variable valve duration/variable valve lift system of claim 8, further comprising: a second cam portion including a second cam connected to the camshaft through the guide slot; and a second rocker arm rotatably connected to the rocker shaft, a first end of which contacts the second cam and a second end of which is connected with a second valve. ### Claim 13 (depends on 12) The variable valve duration/variable valve lift system of claim 12, further comprising: a second roller connected to the first end of the second rocker arm and contacting the second cam; and a second bridge connected to the second end of the second rocker arm, and wherein two second valves are connected to the second bridge. ### Claim 14 An engine comprising: a camshaft; a first cam portion including a first cam, into which the camshaft is inserted, and of which a relative phase angle of the first cam with respect to the camshaft is variable; an inner bracket transmitting rotation of the camshaft to the first cam portion; a slider housing in which the inner bracket is rotatably inserted; a first rocker arm including a first end contacting the first cam; a rocker shaft to which the first rocker arm is rotatably connected; a solenoid valve configured to selectively supply hydraulic pressure; a position controller configured to selectively change a position of the slider housing according to the supplying of the hydraulic pressure supplied from the solenoid valve; a first bridge connected to a second end of the first rocker arm and to which a first valve is connected; and a valve lift disposed within the first bridge to change valve lift of the first valve according to the supplying of the hydraulic pressure supplied from the solenoid valve. ### Claim 15 (depends on 14) The engine of claim 14, wherein the valve lift comprises: a screw on which a screw oil hole connected to the first rocker arm is formed; a plunger slidable within the first bridge and on which a plunger oil hole fluidically-communicated with the screw oil hole is formed; a plunger lock pin slidable within the first bridge and selectively connectable to the plunger according to supplying of hydraulic pressure from the plunger oil hole; a plunger return spring disposed within the first bridge and pushing against the plunger lock pin for the plunger lock pin to be connected to the plunger; a lost motion spring disposed within the first bridge and elastically supporting the plunger; and a swivel foot connecting the plunger with the screw. ### Claim 16 (depends on 14) The engine of claim 14, wherein a control hydraulic line is formed on the rocker shaft; and wherein the solenoid valve and the position controller are fluidically-communicated with the control hydraulic line, and wherein the position controller comprises: a controller housing on which a master valve hole is formed; and a master valve inserted into the master valve hole and moved according to the supplying of the hydraulic pressure from the solenoid valve to change a relative position of the slider housing with respect to the camshaft. ### Claim 17 (depends on 16) The engine of claim 16, wherein a lock pin hole is formed on the controller housing; and a valve groove into which the lock pin is selectively inserted is formed on the master valve, and wherein the position controller comprises: a lock pin disposed within the lock pin hole and selectively connectable to the master valve according to the supplying of the hydraulic pressure from the solenoid valve; and a return spring disposed within the lock pin hole and elastically supporting the lock pin. ### Claim 18 (depends on 14) The engine of claim 14, wherein a first slot and a second slot are formed on the inner bracket; and the first cam portion comprises a wheel on which a wheel key is formed and connected to the first cam, and wherein the engine further comprises: a connecting pin connected to the camshaft; a first slider pin on which a pin slot, where the wheel key is slidably inserted thereto along a length direction of the wheel key, is formed, the first slider pin being rotatably inserted into the first slot; and a second slider pin on which a pin hole, where the connecting pin is slidably inserted thereto along a length direction of the connecting pin, is formed, the second slider pin being rotatably inserted into the second slot. ### Claim 19 (depends on 18) The engine of claim 18, further comprising an outer shaft on which a guide slot is formed and to which the camshaft is inserted, wherein the first cam is connected to the outer shaft. ### Claim 20 (depends on 19) The engine of claim 19, further comprising: a second cam portion including a second cam connected to the camshaft through the guide slot; and a second rocker arm rotatably connected to the rocker shaft, a first end of which contacts the second cam and a second end of which is connected with a second valve. ### Claim 21 (depends on 14) The engine of claim 14, further comprising an upper bracket connecting the camshaft to a cylinder head, wherein a stopper for limiting movement of the slider housing is formed on the upper bracket.