Patent ID: 8667940
Filing Date: 2014-03-11
Classification: F01L,F01M

Abstract:
1. An engine assembly comprising: an engine block; a cylinder head coupled to the engine block; a first lubrication system including a first pump in communication with the engine block and providing a first fluid to the engine block; and a second lubrication system isolated from the first lubrication system and including a second pump in communication with the cylinder head and providing a second fluid to the cylinder head, further comprising a first valve supported by the cylinder head, a second valve supported by the cylinder head, a hydraulic valve actuation mechanism in communication with the second lubrication system for receiving the second fluid from the second pump at a first operating pressure and engaged with the first valve and operable to displace the first valve between open and closed positions, a camshaft supported on the cylinder head, a mechanical valve lift mechanism engaged with the second valve and the camshaft and operable to displace the second valve between open and closed positions, wherein the cylinder head defines a first pressurized fluid reservoir in communication with the fluid outlet of the hydraulic valve actuation mechanism and for supplying the second fluid at a second operating pressure lower than the first pressure to the mechanical valve lift mechanism to lubricate the mechanical valve lift mechanism with the second fluid exiting the hydraulic valve actuation mechanism.