Piston assembly

摘要

A piston assembly and a method of making the same. Exemplary piston assemblies may include a piston crown having a ring belt portion defining a cooling gallery, and a strut extending away from the ring belt portion to define a wrist pin bore. The piston may further include a piston skirt assembly secured to the strut. The piston skirt assembly may include two separate portions that each have a closure plate formed integrally with the portion, with the closure plate generally enclosing the cooling gallery. Exemplary methods of assembling a piston may include providing a piston crown having a ring belt portion defining a cooling gallery and a strut extending away from the ring belt portion to define a wrist pin bore. The methods may further include forming a piston skirt assembly having two portions having a closure plate integrally formed therewith, and securing the skirt to the crown.

主权项

1. A piston assembly, comprising:
a piston crown, including:
a ring belt portion defining at least in part a cooling gallery; anda strut extending away from the ring belt portion to define a wrist pin bore; and a separately formed piston skirt assembly secured to the strut, the piston skirt assembly including two skirt portions, each of the skirt portions having a closure plate integrally formed with the skirt portion, the closure plates cooperating to generally enclose the cooling gallery the skirt portions each having radially outer portions, the radially outer portions defining respective cylindrical outer surfaces configured to engage a cylinder bore, the radially outer portions extending upwardly to meet a radially outer end of their respective closure plates, the radially outer ends of the closure plates engaged with the ring belt portion; wherein the crown defines first mating surfaces extending along the strut; wherein a first one of the skirt portions defines a second mating surface, and a second one of the skirt portions defines a third mating surface, and the second and third mating surfaces are each fixedly secured to respective first mating surface; and wherein the first, second, and third mating surfaces each extend in a direction substantially parallel to a longitudinal axis of the crown.