Patent ID: 6318322
Filing Date: 2001-11-20
Classification: F01L

Abstract:
Valve drive (1) of an internal combustion engine including the following:the valve drive (1) includes a hydraulic support element (2), a finger lever (18) and a cam (25) of a camshaft (26) or a plurality of these structural parts;the support element (2) includes a housing (3) that is installed into a cam-side bore (4) of a cylinder head (5), so that a pressure piston (7) that is axially movable relative to the housing (3) and located in a bore (6) of the housing (3) projects with its head (8) beyond the cylinder head (5) in the direction of the cam, whereby between a bore-side bottom (9) of the housing (3) and a bore-side web (11) of the pressure piston (7), a high pressure chamber (12) for hydraulic medium is formed, where the high-pressure chamber (12) being closeable by a closing body (13) of a check valve (14) attached to the web (11) in the direction toward a supply chamber (44) or a supply line enclosed by the pressure piston (7);the finger lever (18) is constructed as a beam and includes lateral surfaces (23, 20) near the cam and away from the cam, whereby it acts via a first end (22) of the lateral surface (20) away from the cam on at least one gas exchange valve in a direction of stroke and is supported via a second end (19) of the lateral surface (20) away from the cam on the head (8) of the pressure piston (7) so that it can move by pivoting;the cam (25) acts on a contact section (24) that lies between the ends (22, 19) of the cam-side lateral surface (23) of the finger lever (18); characterized in thatthe valve drive (1) is provided with means for compulsory opening of the check valve (14) of the support element (2) during contact of a base circle (.alpha.) of the cam (25) on the finger lever (18), comprising a slide (27), a separate lever (28) and a signal path (29) located on the cam (25), whereby the slide (27) is arranged in the support element (2) and includes a first end (35) that projects axially beyond the head (8) and with another end (34) impinges the closing body (13) of the check valve (14), the first end (35) contacts the separate lever (28), which contacts the signal path (29) on one end and on the other end, is pivotably attached to the second end (19) of the finger lever (18) or the cylinder head (5).