Reinforced pistons
AssigneeAe PLC
InventorsRobert Munro, Roger A. Day
Life of this patent
Estimating the term…
Abstract
A reinforced piston is provided for an internal combustion engine. The uppermost piston ring groove is as close as possible to the crown of the piston. At least the lower surface of the groove is defined by an en-cast insert and overlying this is a portion of the crown reinforced by fibres, thus allowing this portion to be thin and the spacing between the ring groove and the upper surface of the crown to be minimized. The reinforced crown portion also holds the insert against axial separating movement. The crown can be provided with a combustion bowl whose entrance is reinforced by the fibres.
Claims18
A piston for an internal combustion engine formed of a light metal or metal alloy and comprising:
- a crown having an upper surface,
- a ring band extending around the crown and including at leat two piston ring grooves,
- each of said at least two piston ring grooves having upper and lower generally radially extending surfaces,
- one of said piston ring grooves being closely adjacent said crown and having at least the lower radially extending surface thereof formed by a wear-resistant insert which is cast into the piston,
- at least a portion of the crown including a fibre reinforcement which contacts the insert and which is between the insert and an upper surface of the crown said at least a portion of the crown being of minimum axial thickness, to prevent the separation of said insert from the crown in an axial direction while allowing the upper piston ring groove to be close to the upper surface of the crown.
Dependencies are inferred from the claim text.