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US 7,409,938 B2Granted
Valve drive of an internal combustion engine comprising a cylinder head
AssigneeAudi AG
InventorStefan Dengler
Life of this patent
Estimating the term…
Abstract
The invention relates to a valve drive of an internal combustion engine, comprising at least one camshaft whereon at least one cam carrier is arranged in a rotationally fixed and axially displaceable manner. Means for applying axial tension are formed between the at least one camshaft and the at least one cam support, thereby enabling the at least one cam support to be fixed in an axial manner.
Claims10
A valve drive of an internal combustion engine comprising:
- a cylinder head with at least one camshaft on which at least one cam carrier is mounted so as to be nonrotatable and axially displaceable,
- the at least one cam carrier having at least one cam on which at least two different cam travel paths are configured,
- the at least one cam carrier, for the purpose of bearing the at least one camshaft, being enclosed in at least one camshaft bearing rigidly mounted on a cylinder head,
- means for axially displacing at least one cam carrier in relation to the at least one camshaft between a first axial position and at least one second axial position, wherein
- in the first axial position of the cam carrier, a first contact surface rigidly mounted on a first cam carrier is in contact with a first contact surface rigidly mounted on a cylinder head,
- in the second axial position of the cam carrier, a second contact surface rigidly mounted on a cam carrier is in contact with a second contact surface rigidly mounted on a cylinder head, and
- means for applying an axial tensioning force are configured between camshaft and cam carrier, the axial tensioning force displacing the cam carrier in the area of the first axial position in the direction of the first axial position, and in the area of the second axial position in the direction of the second axial position.
4 more elements
A camshaft of an internal combustion chamber provided with a cylinder head, comprising:
- a shaft mounted on said cylinder head for rotation about the axis thereof;
- at least one cam carrier nonrotatably mounted on said shaft and displaceable axially, including a cylindrical section journaled in said cylinder head and a pair of opposed surfaces engageable with abutment surfaces of said cylinder head to restrict the axial displacement of said cam carrier in first and second axially spaced positions, at least one cam section having at least two different cam surface profiles, and a section provided with a helical groove cooperable with a member selectively insertable in said groove effective to impart axial displacement of said cam carrier between said first and second positions as said shaft is rotated;
- means cooperative with said cam carrier effective to impart axial displacement of said carrier member between said first and second position in a direction opposite of the direction of movement imparted by said helical groove;
- and
- means mounted on one of said shaft and cam carrier and cooperative with the other thereof for trippably retaining said cam carrier in one of said first and second positions.
2 more elements
Dependencies are inferred from the claim text.