Valve mechanisms
AssigneeJaguar Cars Limited
InventorBryan N. V. Parsons
Life of this patent
Estimating the term…
Abstract
A valve mechanism includes a poppet type valve, a valve lever pivotally mounted at one end and attached at the other end to the end of the stem of the valve, the valve lever defines a track in which is located a drive pin and a drive mechanism is arranged to drive the drive pin in oscillatory manner; the track has a first portion which, when the valve is closed is engaged by the drive pin and coincides with the path of the drive pin, and a second portion which diverges from the path of the drive pin so that when engaged by the drive pin movement of the drive pin will cause the valve lever to move, opening and closing the valve. Preferably the mean position of oscillation of the drive pin is adjustable so that the duration and amplitude of valve opening may be varied.
Claims21
A valve mechanism comprising;
- a valve having a valve stem which is located for axial movement in a valve guide and a valve head adapted at one extreme of movement of the valve to locate against and close a valve seat;
- a valve lever pivotally mounted at one end and attached adjacent the other end to the end of the valve stem remote from the valve head;
- said valve lever defining a track;
- a drive pin permanently engaging said track and drive means to drive said drive pin in oscillatory manner;
- said track having a first portion which, when the valve is closed, is engaged by the drive pin and coincides with the path of the drive pin and a second portion which diverges from the path of the drive pin, so that engagement of the second portion by the drive pin will cause the valve lever to move to positively open and close the valve.
Dependencies are inferred from the claim text.