Welded piston assembly
First Claim
1. A pre-finished assembly for making a piston, comprising:
- a lower part defining a longitudinal axis, the lower part having a skirt and forming a lower surface of a cooling gallery, the lower part having a radially inner bowl surface defining a lower part radially inner mating surface, the radially inner bowl surface extending from a radially innermost edge of the radially inner mating surface toward a center portion of the assembly, the lower part including a radially outer wall defining a radially outer mating surface; and
an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint, the upper part including a radially inner wall defining a lower surface extending radially to define an upper part radially inner mating surface, the radially inner wall defining a radially inwardly facing surface leading upwardly away from the upper part radially inner mating surface, the upper part including a radially outer wall defining an upper part radially outer mating surface;
wherein the upper part radially inner mating surface and the radially inner bowl surface of the lower part each define different radial widths.
1 Assignment
0 Petitions
Accused Products
Abstract
A pre-finished piston part is disclosed that may be used to form a piston assembly. A pre-finished piston may include a lower part defining a piston axis, the lower part having a skirt and forming a lower surface of a cooling gallery. The lower part may include a radially inner bowl surface defining a lower part radially inner mating surface. The pre-finished piston assembly may further include an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint. The upper part may include a radially inner wall defining a radially inner upper part mating surface. The radially inner wall may define a radially inwardly facing surface that defines a non-parallel angle with the radially inner bowl surface where the radially inner bowl surface meets the radially innermost edge of the radially inner mating surface.
35 Citations
20 Claims
-
1. A pre-finished assembly for making a piston, comprising:
-
a lower part defining a longitudinal axis, the lower part having a skirt and forming a lower surface of a cooling gallery, the lower part having a radially inner bowl surface defining a lower part radially inner mating surface, the radially inner bowl surface extending from a radially innermost edge of the radially inner mating surface toward a center portion of the assembly, the lower part including a radially outer wall defining a radially outer mating surface; and an upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint, the upper part including a radially inner wall defining a lower surface extending radially to define an upper part radially inner mating surface, the radially inner wall defining a radially inwardly facing surface leading upwardly away from the upper part radially inner mating surface, the upper part including a radially outer wall defining an upper part radially outer mating surface; wherein the upper part radially inner mating surface and the radially inner bowl surface of the lower part each define different radial widths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method of joining a pre-finished assembly, comprising:
-
providing a lower part defining a longitudinal axis, the lower part having a skirt and forming a lower surface of a cooling gallery, the lower part having a radially inner bowl surface defining a lower part radially inner mating surface, the lower part including a radially outer wall defining a radially outer mating surface; abutting the lower part against an upper part, the upper part having a radially outer bowl surface meeting the radially inner bowl surface at a radially inner joint, the upper part including a radially inner wall defining a lower surface extending radially to define an upper part radially inner mating surface, the radially inner wall defining a radially inwardly facing surface leading upwardly away from the upper part radially inner mating surface, the upper part including a radially outer wall defining an upper part radially outer mating surface; and welding the radially inner mating surfaces together, wherein the upper part radially inner mating surface and the radially inner bowl surface of the lower part each define different radial widths. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification