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Variable Valve Drive Having A Rocker Lever
| Content Provider | The Lens |
|---|---|
| Abstract | The present disclosure relates to a variable valve drive for a lifting valve, in particular for a charge-exchange valve of an internal combustion engine, which is periodically movable between a closed position and an open position indirectly by way of a cam via a rocker lever. The variable valve drive includes a switchable rocker lever arrangement for the actuation of the lifting valve, having a transmission rocker lever and a valve rocker lever which are mounted pivotably on different rocker lever axles which are each parallel to the camshaft axis. |
| Related Links | https://www.lens.org/lens/patent/010-245-230-421-838/frontpage |
| Language | English |
| Publisher Date | 2017-10-19 |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
| Jurisdiction | United States of America |
| Date Applied | 2017-04-12 |
| Applicant | Man Truck & Bus Ag |
| Application No. | 201715485572 |
| Claim | A variable valve drive for a lifting valve, in particular for a charge-exchange valve of an internal combustion engine, which is periodically movable between a closed position and an open position indirectly by way of a cam of a camshaft, comprising: a switchable rocker lever arrangement for the actuation of the lifting valve, having a transmission rocker lever and a valve rocker lever which are mounted so as to be pivotable on different rocker lever axles which are each parallel to a camshaft axis, wherein the valve rocker lever, at a first end, is in operative contact with the lifting valve and, at a second end, has a roller, wherein the transmission rocker lever, at a first end, is in engagement with a cam of a camshaft and, at a second end, is operatively connected, by way of a contour surface, to the roller of the valve rocker lever, in such a way that a rocking movement of the transmission rocker lever generates a rocking movement of the valve rocker lever, during which the roller of the valve rocker lever rolls on the contour surface; and an actuating device for the switching of the rocker lever arrangement, by way of which actuating device the contour surface can be rotated about the rocker lever axle of the transmission rocker lever by means of a planetary gearing, in order to generate a displacement of a rolling region of the roller of the valve rocker lever on the contour surface. The variable valve drive according to claim 1 , wherein the transmission rocker lever includes: at least one planet gear of the planetary gearing, which at least one planet gear is guided by a planet carrier element of the transmission rocker lever, wherein the planet carrier element has the first end which engages with a cam of the camshaft, and an internal gear of the planetary gearing, which internal gear has the contour surface on the outer circumference and engages into the at least one planet gear; and further comprising a sun gear of the planetary gearing connected rotationally conjointly to a shaft which can be rotated by the actuating device. The variable valve drive according to claim 2 , wherein the actuating device comprises an electrical, electromechanical, mechanical or hydraulic actuating unit, by means of which, for the adjustment of the valve lift, a rotational position of the shaft bearing the sun gear is adjustable. The variable valve drive according to claim 1 , wherein the contour surface has a first rolling region which forms in particular a base circle contour which generates no valve lift when the roller of the valve rocker lever rolls on the base circle contour, and has a second rolling region which adjoins the first rolling region and which has a ramp contour. The variable valve drive according to claim 4 , wherein the contour surface has a third rolling region which adjoins the second rolling region and which generates a valve position with maximum valve lift when the roller of the valve rocker lever rolls on the third rolling region. The variable valve drive the shaft bearing the sun gear according to claim 2 , wherein the actuating device is designed to vary a rotational position of the shaft bearing the sun gear in a continuously variable fashion. The variable valve drive the shaft bearing the sun gear according to claim 2 , wherein the actuating device is designed to vary a rotational position of the shaft bearing the sun gear into two predetermined positions, such that switching is possible between two different valve lifts. The variable valve drive according to claim 1 , wherein the transmission rocker lever is preloaded by way of a restoring spring such that the transmission rocker lever is pushed against the camshaft. The variable valve drive according to claim 5 , wherein the contour surface has a fourth rolling region, which adjoins the third rolling region and which forms a ramp contour, and a fifth rolling region, which adjoins the fourth rolling region, wherein the fifth rolling region has a constant radial spacing to the axis of the rocker lever axle of the transmission lever, which spacing is greater than the radial spacing of the third rolling region and greater than the radial spacing of the first rolling region. An arrangement comprising: at least two variable valve drives, each variable valve drive including, a switchable rocker lever arrangement for the actuation of the lifting valve, having a transmission rocker lever and a valve rocker lever which are mounted so as to be pivotable on different rocker lever axles which are each parallel to a camshaft axis, wherein the valve rocker lever, at a first end, is in operative contact with the lifting valve and, at a second end, has a roller, wherein the transmission rocker lever, at a first end, is in engagement with a cam of a camshaft and, at a second end, is operatively connected, by way of a contour surface, to the roller of the valve rocker lever, in such a way that a rocking movement of the transmission rocker lever generates a rocking movement of the valve rocker lever, during which the roller of the valve rocker lever rolls on the contour surface; and an actuating device for the switching of the rocker lever arrangement, by way of which actuating device the contour surface can be rotated about the rocker lever axle of the transmission rocker lever by means of a planetary gearing, in order to generate a displacement of a rolling region of the roller of the valve rocker lever on the contour surface, wherein the transmission rocker levers each have a common first rocker lever axis, the valve rocker levers each have a common second rocker lever axis, and the at least two variable valve drives have a common actuating device in the form of an electric motor, wherein the electric motor is operatively connected to a shaft which is coaxial with respect to the first rocker lever axis. A motor vehicle, in particular utility vehicle, having a having a variable valve drive comprising: a switchable rocker lever arrangement for the actuation of the lifting valve, having a transmission rocker lever and a valve rocker lever which are mounted so as to be pivotable on different rocker lever axles which are each parallel to a camshaft axis, wherein the valve rocker lever, at a first end, is in operative contact with the lifting valve and, at a second end, has a roller, wherein the transmission rocker lever, at a first end, is in engagement with a cam of a camshaft and, at a second end, is operatively connected, by way of a contour surface, to the roller of the valve rocker lever, in such a way that a rocking movement of the transmission rocker lever generates a rocking movement of the valve rocker lever, during which the roller of the valve rocker lever rolls on the contour surface; and an actuating device for the switching of the rocker lever arrangement, by way of which actuating device the contour surface can be rotated about the rocker lever axle of the transmission rocker lever by means of a planetary gearing, in order to generate a displacement of a rolling region of the roller of the valve rocker lever on the contour surface. |
| CPC Classification | Cyclically Operating Valves For Machines Or Engines CONTROLLING COMBUSTION ENGINES GEARING |
| Extended Family | 010-245-230-421-838 124-654-190-504-567 041-276-046-841-601 195-223-862-868-672 052-313-785-770-033 038-629-248-803-120 061-486-891-952-932 062-313-328-173-244 003-022-933-912-842 127-777-212-695-472 195-654-497-568-78X |
| Patent ID | 20170298786 |
| Inventor/Author | Pham Hai-son |
| IPC | F01L1/18 F01L1/047 F01L1/08 F01L1/20 F01L1/46 F16H37/12 |
| Status | Active |
| Owner | Man Truck & Bus Ag |
| Simple Family | 010-245-230-421-838 124-654-190-504-567 041-276-046-841-601 195-223-862-868-672 052-313-785-770-033 038-629-248-803-120 061-486-891-952-932 062-313-328-173-244 003-022-933-912-842 195-654-497-568-78X 127-777-212-695-472 |
| CPC (with Group) | F01L1/181 F01L1/12 F01L1/2411 F01L1/267 F01L13/0063 F01L2305/00 F01L1/047 F01L1/08 F01L1/20 F01L1/462 F02D13/02 F01L13/0026 F01L13/0047 F01L2820/032 F16H37/122 |
| Issuing Authority | United States Patent and Trademark Office (USPTO) |
| Kind | Patent Application Publication |
