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.
Claims17
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 said base shaft and comprising a first, a second,
- and a third respective cam lobe, where each cam lobe is differently shaped from each of said other cam lobes;
- and
- first and second actuator bodies each associated with respective actuator pins, where each actuator pin is connected to a respective valve of a cylinder of the internal combustion engine and said first and second actuator bodies are configured to be moved when contacted by one of said first and third cam lobes aligned therewith and, which contact thereby lifts the valve associated with said first or second actuator body from a closed position to an open position,
- wherein said second cam lobe of said lobe pack is located between said first and third cam lobes and has a shape that does not move said first or second actuator bodies when aligned therewith via rotation of said camshaft, and that said second cam lobe is in common to both first and second actuator bodies, and
- wherein said lobe pack is configured to be axially moveable along said base shaft between a first position, in which said first actuator body is aligned with and contacted by said first cam lobe via rotation of said camshaft and said second actuator body is aligned with said second cam lobe, and a second position, in which said second actuator body is aligned with and contacted by said third cam lobe via rotation of said camshaft and said first actuator body is aligned with said second cam lobe.
An internal combustion engine including a valve drive for use with the internal combustion engine, wherein said valve drive comprises:
- a camshaft comprising:
- a base shaft configured to rotate about a longitudinal axis;
- and
- a lobe pack mounted on said base shaft and comprising a first, a second,
- and a third respective cam lobe, where each cam lobe is differently shaped from each of said other cam lobes;
- and
- first and second actuator bodies each associated with respective actuator pins, where each actuator pin is connected to a respective valve of a cylinder of the internal combustion engine and said first and second actuator bodies are configured to be moved when contacted by one of said first and third cam lobes aligned therewith and, which contact thereby lifts the valve associated with said first or second actuator body from a closed position to an open position,
- wherein said second cam lobe of said lobe pack is located between said first and third cam lobes and has a shape that does not move said first or second actuator bodies when aligned therewith via rotation of said camshaft, and that said second cam lobe is in common to both first and second actuator bodies, and
- wherein said lobe pack is configured to be axially moveable along said base shaft between a first position, in which said first actuator body is aligned with and contacted by said first cam lobe via rotation of said camshaft and said second actuator body is aligned with said second cam lobe, and a second position, in which said second actuator body is aligned with and contacted by said third cam lobe via rotation of said camshaft and said first actuator body is aligned with said second cam lobe.
A motor vehicle including an internal combustion engine and a valve drive for use with the internal combustion engine, wherein said valve drive comprises:
- a camshaft comprising:
- a base shaft configured to rotate about a longitudinal axis;
- and
- a lobe pack mounted on said base shaft and comprising a first, a second,
- and a third respective cam lobe, where each cam lobe is differently shaped from each of said other cam lobes;
- and
- first and second actuator bodies each associated with respective actuator pins, where each actuator pin is connected to a respective valve of a cylinder of the internal combustion engine and said first and second actuator bodies are configured to be moved when contacted by one of said first and third cam lobes aligned therewith and, which contact thereby lifts the valve associated with said first or second actuator body from a closed position to an open position,
- wherein said second cam lobe of said lobe pack is located between said first and third cam lobes and has a shape that does not move said first or second actuator bodies when aligned therewith via rotation of said camshaft, and that said second cam lobe is in common to both first and second actuator bodies, and
- wherein said lobe pack is configured to be axially moveable along said base shaft between a first position, in which said first actuator body is aligned with and contacted by said first cam lobe via rotation of said camshaft and said second actuator body is aligned with said second cam lobe, and a second position, in which said second actuator body is aligned with and contacted by said third cam lobe via rotation of said camshaft and said first actuator body is aligned with said second cam lobe.
Dependencies are inferred from the claim text.