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US 8,770,161 B2Granted
Valve lift device for a combustion engine
AssigneeScania CV AB
InventorNiclas Gunnarsson
Life of this patent
Estimating the term…
Abstract
A valve lift device for a combustion engine, a camshaft (5), a first unit (16) with a first contact device (9) in contact with a guide surface on the camshaft (5), a motion-transmitting mechanism converting the lifting movement of the unit (16) to a lift of at least one valve (3) of the combustion engine. An adjusting device (20-22) allows linear movements of the first unit (16) and hence of the first contact device (9) in a plane which is perpendicular to the camshaft's rotational axis (5a) between at least a first position of contact (9a1) with the guide surface (6) and a second position of contact (9a2) with the guide surface (6).
Claims9
A valve lift device for a combustion engine, the valve lift device comprising:
- a camshaft having a rotational axis;
- a first guide surface on the camshaft, a first protruding portion on the first guide surface;
- a first unit comprising a first contact device in contact with the first guide surface, the first unit is configured and operable for undergoing a lifting movement when the first contact device comes into contact with the first protruding portion of the first guide surface;
- a motion-transmitting mechanism configured and operable for converting the lifting movement of the first unit for lifting at least one valve of the combustion engine;
- an adjusting device configured and operable for allowing linear movements of the first unit causing linear movement of the first contact device in a plane perpendicular to the camshaft's rotational axis, between at least a first contact position of the first contact device on the first guide surface and a second contact position of the first contact device on the guide surface;
- a second guide surface on the camshaft, a second protruding portion on the second guide surface;
- a second unit comprising a second contact device in contact with the second guide surface on the camshaft, the second unit is configured and operable for undergoing a lifting movement when the second contact device comes into contact with the second protruding portion of the second guide surface;
- wherein the first and second units are connected to the motion-transmitting mechanism in such a configuration that the one of the first and second units which at the time undergoes the higher lift of its guide surface transmits that lift to the valve;
- wherein one of the units is directly connected to the motion-transmitting mechanism and the other unit comprises a contact portion entering into engagement with a contact portion of the directly connected unit for lifting the directly connected unit when the other unit undergoes a higher lift of the respective guide surface thereof than the guide surface of the directly connected unit.
6 more elements
A valve lift device for a combustion engine, the valve lift device comprising:
- a camshaft having a rotational axis;
- a first guide surface on the camshaft, a first protruding portion on the first guide surface;
- a first unit comprising a first contact device in contact with the first guide surface, the first unit is configured and operable for undergoing a lifting movement when the first contact device comes into contact with the first protruding portion of the first guide surface;
- a motion-transmitting mechanism configured and operable for converting the lifting movement of the first unit for lifting at least one valve of the combustion engine;
- an adjusting device configured and operable for allowing linear movements of the first unit causing linear movement of the first contact device in a plane perpendicular to the camshaft's rotational axis, between at least a first contact position of the first contact device on the first guide surface and a second contact position of the first contact device on the guide surface;
- a second guide surface on the camshaft, a second protruding portion on the second guide surface;
- a second unit comprising a second contact device in contact with the second guide surface on the camshaft, the second unit is configured and operable for undergoing a lifting movement when the second contact device comes into contact with the second protruding portion of the second guide surface;
- wherein the valve lift device comprises a second adjusting device configured and operable for allowing linear movements of the second unit and of the second contact device in a plane which is perpendicular to the camshaft's rotational axis between at least two contact positions on the guide surface.
5 more elements
Dependencies are inferred from the claim text.