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US 10,371,024 B2Granted
Variable duration valve system
Assignee2575168 Ontario Inc.
InventorJohn David Jeffery
Life of this patent
Estimating the term…
Abstract
A valve assembly selectively varies the timing of the valves in an internal combustion engine cycle by way of a first and second camshaft. Each valve has a shuttle portion and a valve portion. Upper and lower cam followers on the shuttle portion engage with first and second cams on each of the first and second camshafts to move the valve between an open and closed position with reference to a valve seat on an engine block.
Claims8
A valve assembly comprising:
- a valve, which moves between an open and closed position with reference to a valve seat on an engine block, having a valve portion and a shuttle portion, wherein the valve portion has a valve stem and a valve head and the shuttle portion has a body with opposing sides, an upper cam follower on one side of the body, and a lower cam follower on the other side of the body;
- a first and second cam on a first camshaft for opening the valve;
- a first and second cam on a second camshaft for closing the valve;
- wherein the first cam on the first camshaft engages the lower cam follower to initiate the opening movement of the valve, and the second cam on the first camshaft engages the upper cam follower to control the opening movement of the valve;
- and wherein the first cam on the second camshaft engages the upper cam follower to initiate the closing movement of the valve, and the second cam on the second camshaft engages the lower cam follower to control the closing movement of the valve;
- and wherein the valve has a first magnet target corresponding to the open position and a second magnet target corresponding to the closed position that magnetically engage with a magnet to releasably retain the valve in the open or closed position.
3 more elements
Dependencies are inferred from the claim text.