Piston crown to raise compression ratio
AssigneeFord Global Technologies, LLC
InventorsJonathan Patrick JEFFRIES, Brian Denis ARMSTRONG, Thomas Jeremy KOSTRZEWSKI
Life of this patent
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Abstract
A piston includes a crown having a deck, a spark recess, an exhaust valve recess, and an intake valve recess. The piston also includes a wedge disposed on the crown extending from the exhaust valve recess and the intake valve recess toward the spark recess above the deck. The wedge is a planar wedge disposed at an angle substantially parallel to an associated exhaust valve received by the exhaust valve recess. The crown is symmetrical about a piston center line.
Claims14
A piston comprising:
- a crown having a deck, a spark recess, an exhaust valve recess, and an intake valve recess;
- and
- a wedge disposed on the crown extending from the exhaust valve recess and the intake valve recess toward the spark recess above the deck at an angle substantially parallel to an associated exhaust valve received by the exhaust valve recess, the crown being symmetrical about a piston center line.
An engine comprising:
- an engine block and cylinder head defining a cylinder;
- and
- a piston disposed within the cylinder having a symmetric dome crown including a wedge extending from an intake valve recess and an exhaust valve recess sloping above a deck toward a center of the crown parallel to an exhaust valve being received by the exhaust valve recess and an arcuate ramp disposed between the valve recesses tangent to the deck and the wedge.
A dome piston having a crown symmetric about a center line, each half of the crown comprising:
- a deck;
- an intake valve relief and an exhaust valve relief each extending below the deck to a planar wedge extending from the valve reliefs above the deck to an apex;
- a spark plug recess at the apex;
- and
- an arcuate ramp disposed between the valve reliefs and extending tangentially between the deck and the wedge.
Dependencies are inferred from the claim text.