One-piece steel piston
First Claim
Patent Images
1. A one-piece piston that comprises:
- a top;
a pair of opposed pin bosses with pin bores formed therein;
a skirt having a top portion; and
a cooling gallery that is comprises an annular cavity formed in a side of the piston which annular cavity is closed by a flange that is continuous with the top of the piston and which flange has been displaced so that a peripheral terminal edge of the flange abuts the top portion of the skirt as to close the annular cavity and define a portion of the cooling gallery,said top, skirt and flange are all formed from a single blank.
2 Assignments
0 Petitions
Accused Products
Abstract
A one-piece steel piston that is made from a piston blank that includes a portion that configured and designed to be displaced to form a cooling gallery and ring belt. The piston blank can be formed by a casting or forging process. The portion that is designed and configured to be displaced is a flange that extends radially at the top of the piston blank. The flange is bent downward so that a peripheral edge of the flange contacts a top portion of the piston skirt. The peripheral edge of the flange and the top portion of the skirt can be welded together or provided with inter-engaging structures.
35 Citations
23 Claims
-
1. A one-piece piston that comprises:
-
a top; a pair of opposed pin bosses with pin bores formed therein; a skirt having a top portion; and a cooling gallery that is comprises an annular cavity formed in a side of the piston which annular cavity is closed by a flange that is continuous with the top of the piston and which flange has been displaced so that a peripheral terminal edge of the flange abuts the top portion of the skirt as to close the annular cavity and define a portion of the cooling gallery, said top, skirt and flange are all formed from a single blank. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
- 8. A piston blank from which a piston can be fabricated, said piston blank comprising a top portion, a skirt, a pair of opposed pin bosses and a flange extending radially outward from the top portion, said flange being configured to be displaced downward to contact a top portion of the skirt.
-
13. A method of fabricating a one-piece piston which comprises:
-
providing a piston blank having a top portion, a skirt, a pair of opposed pin bosses and a flange extending radially outward from the top portion; forming an annular cooling gallery under the flange; displacing the flange so that an outer peripheral edge of the flange contacts a top portion of the skirt and closes off the cooling gallery; and forming piston ring grooves in the flange. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
Specification