Valve mechanism for at least two simultaneously actuable valves
AssigneeGeneral Motors Corporation
InventorFritz Heimburg
Life of this patent
Estimating the term…
Abstract
A pair of adjacent valves (intake or exhaust) are operated by a single cam lobe on an engine camshaft via a bucket tappet, the arrangement being such that both the bucket tappet and the valves are rotatable during engine operation to reduce wear thereof. Preferably, a hydraulic lash adjuster is operatively associated with the bucket tappet and with a thrust member engaging the free stem ends of the valves.
Claims4
Valve gear for at least two valves of an internal combustion engine to be operated simultaneously on longitudinal axes, wherein the valve gear comprises a thrust device which is common to all valves and displaceable on an axis by a cam shaft and against which the valves abut by their valve stems so that displacement of the thrust device causes corresponding displacement of the valves, characterized in that the camshaft (18) includes a single cam (19) that is seated on the thrust device (11) eccentrically relative to its axis (17) causing rotation of the thrust device (11) about its axis (17) when the thrust device (11) is displaced, the thrust device (11) is axially symmetrical, and the valve stems (7,8) each abut against the thrust device (11) at positions centered on points offset from the longitudinal axes (12, 13) of the valves causing rotation of the valves (1,2) about their longitudinal axis (12, 13) when the valves are displaced.
Valve gear including a hydraulic play-compensating device for at least two valves of an internal combustion engine to be operated simultaneously on longitudinal axes, wherein the valve gear comprises a thrust device which is common to all valves and displaceable on an axis by a camshaft and against which the valves abut by their valve stems, characterized in that the camshaft (18) includes a single cam (19) that is seated on the thrust device (11) eccentrically relative to its axis (17), the thrust device (11) is axially symmetrical, the valve stems (7,8) each abut against the thrust device (11) at positions centered on points offset from the longitudinal axes (12, 13) of the valves, and the thrust device (11) includes a cup tappet (21) operatively located for abutment against the cam (19) of the camshaft (18) said cup tappet being guided axially in a wall (16) of the engine, a thrust piece (29) operatively located in said cup tappet (21), and a tappet clearance compensator (22) operatively positioned between the cup tappet (21) and the thrust piece (29), and wherein said thrust piece (29) has a central spherical segment-shaped surface (28) for abutment against a corresponding spherical segment surface (27) of said tappet clearance compensator (22).
Dependencies are inferred from the claim text.