Multi-part piston construction for an opposed-piston engine
AssigneeGeneral Atomics Aeronautical Systems, Inc.
InventorRyan G. MacKenzie
Life of this patent
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Abstract
A piston for an internal combustion opposed-piston engine includes a crown part, a skirt part, and an outer part. The crown part includes a first ring belt region for supporting compression rings and an end surface shaped to form a combustion chamber with an end surface of an opposing piston. The skirt part includes a sidewall and a wristpin bore with a first opening and a second opening formed in the sidewall. The outer part includes a second ring belt region for supporting oil control rings. The crown part is joined to an upper end of the sidewall with one or more welding seams. The outer part is joined to a lower end of the sidewall with a welding seam.
Claims16
A method of making a piston for an opposed-piston engine, comprising:
- providing a crown part comprising a circumferentially-extending compression ring belt region with one or more ring grooves, an end surface shaped to define a combustion chamber with an end surface of an opposing piston of the opposed-piston engine, a bowl in the end surface, and notches in the end surface which open into the bowl through a peripheral edge of the crown part, the bowl having a longitudinal axis, the notches being spaced along the longitudinal axis of the bowl so as to be situated at opposed locations on the peripheral edge;
- providing a skirt part comprising a first end, a second end, and a wristpin bore with a wristpin bore axis;
- providing an outer part comprising a circumferentially-extending oil ring belt region with one or more ring grooves;
- registering the crown part with respect to the skirt part such that there is a predetermined orientation between the longitudinal axis of the bowl and the wristpin bore axis;
- joining the crown part to the first end of the skirt part with one or more first weld seams;
- and
- joining the second end of the skirt part to the outer part with a second weld seam.
Dependencies are inferred from the claim text.