A valve drive
AssigneeScania CV AB
InventorHans GÖRANSSON
Life of this patent
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Abstract
A valve drive comprising a camshaft with base shaft, a lobe pack mounted on the base shaft and comprising three cam lobes. Two actuator bodies are associated with two actuator pins each connected to a valve of a cylinder of the engine. The lobe pack is axially displaceable along the base shaft so as to for each actuator body change cam lobe aligned therewith. A middle cam lobe has a shape leaving an actuator body aligned therewith uninfluenced thereby. In a first position of the lobe pack a first of the actuator bodies is aligned with and hit and moved by a first cam lobe and the other, second actuator body is aligned with the middle cam lobe, and in a second position the second actuator body is aligned with and hit and moved by a third cam lobe and the first actuator body is aligned with the middle cam lobe.
Claims19
A valve drive for use in an internal combustion engine comprising:
- a camshaft comprising:
- a base shaft configured to rotate about a longitudinal axis;
- and
- a lobe pack mounted on the base shaft and comprising at least two differently shaped cam lobes;
- two actuator bodies associated with two actuator pins, in which each pin is connected to a valve of a cylinder of the engine and each actuator body is configured to be moved when hit by a said cam lobe aligned therewith and by that lift at least one said valve between a closed and open positions;
- and
- an arrangement controllable to displace the lobe pack axially along the base shaft so as to for each actuator body change cam lobe aligned therewith,
- wherein the lobe pack comprises three cam lobes of which a second, middle cam lobe has a shape leaving an actuator body aligned therewith uninfluenced thereby by rotation of the camshaft, and that this middle cam lobe is in common to both actuator bodies, and
- wherein the arrangement is configured to displace the lobe pack between a first position, in which a first of said actuator bodies is aligned with and hit and moved by a first said cam lobe by rotation of the camshaft and the other, second actuator body is aligned with said middle cam lobe, and a second position, in which the second actuator body is aligned with and hit and moved by a third said cam lobe by rotation of the camshaft and the first actuator body is aligned with the middle cam lobe.
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An internal combustion engine comprising a valve drive for use in an internal combustion engine, said valve drive comprising:
- a camshaft comprising:
- a base shaft configured to rotate about a longitudinal axis;
- and
- a lobe pack mounted on the base shaft and comprising at least two differently shaped cam lobes;
- two actuator bodies associated with two actuator pins, in which each pin is connected to a valve of a cylinder of the engine and each actuator body is configured to be moved when hit by a said cam lobe aligned therewith and by that lift at least one said valve between a closed and open positions;
- and
- an arrangement controllable to displace the lobe pack axially along the base shaft so as to for each actuator body change cam lobe aligned therewith,
- wherein the lobe pack comprises three cam lobes of which a second, middle cam lobe has a shape leaving an actuator body aligned therewith uninfluenced thereby by rotation of the camshaft, and that this middle cam lobe is in common to both actuator bodies, and
- wherein the arrangement is configured to displace the lobe pack between a first position, in which a first of said actuator bodies is aligned with and hit and moved by a first said cam lobe by rotation of the camshaft and the other, second actuator body is aligned with said middle cam lobe, and a second position, in which the second actuator body is aligned with and hit and moved by a third said cam lobe by rotation of the camshaft and the first actuator body is aligned with the middle cam lobe.
A motor vehicle comprising a valve drive for use in an internal combustion engine, said valve drive comprising:
- a camshaft comprising:
- a base shaft configured to rotate about a longitudinal axis;
- and
- a lobe pack mounted on the base shaft and comprising at least two differently shaped cam lobes;
- two actuator bodies associated with two actuator pins, in which each pin is connected to a valve of a cylinder of the engine and each actuator body is configured to be moved when hit by a said cam lobe aligned therewith and by that lift at least one said valve between a closed and open positions;
- and
- an arrangement controllable to displace the lobe pack axially along the base shaft so as to for each actuator body change cam lobe aligned therewith,
- wherein the lobe pack comprises three cam lobes of which a second, middle cam lobe has a shape leaving an actuator body aligned therewith uninfluenced thereby by rotation of the camshaft, and that this middle cam lobe is in common to both actuator bodies, and
- wherein the arrangement is configured to displace the lobe pack between a first position, in which a first of said actuator bodies is aligned with and hit and moved by a first said cam lobe by rotation of the camshaft and the other, second actuator body is aligned with said middle cam lobe, and a second position, in which the second actuator body is aligned with and hit and moved by a third said cam lobe by rotation of the camshaft and the first actuator body is aligned with the middle cam lobe.
Dependencies are inferred from the claim text.