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US 12,331,820 B2Granted
Method of making an interaxle differential unit and an annular case
AssigneeArvinMeritor Technology, LLC
InventorsJoseph Melekian, Bin Hu, Nagaraja Gargeshwari
Life of this patent
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Abstract
A method of making an interaxle differential unit. The method may include piercing a workpiece and then ring roll forging the workpiece to form an annular case that is a seamless ring. The annular case may be heat treated before installing an interaxle differential unit gear nest inside the annular case.
Claims20
A method of making an interaxle differential unit, the method comprising:
- piercing a workpiece to form a through hole;
- ring roll forging the workpiece to form an annular case that is a seamless ring that comprises an outer side and an inner side that is disposed opposite the outer side and faces toward a center axis, wherein ring roll forging the workpiece to form the annular case comprises forming the outer side and the inner side to form a cross sectional profile, and wherein forming the cross sectional profile includes increasing an inside diameter of the inner side between a first end surface of the annular case and a second end surface of the annular case that is disposed opposite the first end surface such that at least a portion of the inner side has a larger diameter than a first opening that is encircled by the first end surface and a second opening that is encircled by the second end surface;
- heat treating the annular case;
- and
- installing an interaxle differential unit gear nest inside the annular case.
2 more elements
A method of making an interaxle differential unit, the method comprising:
- piercing a workpiece to form a through hole;
- ring roll forging the workpiece to form an annular case that is a seamless ring, wherein the annular case includes a first end surface that encircles a first opening, a second end surface that encircles a second opening, a first enlarged lip that extends from the first end surface, a second enlarged lip that extends from the second end surface, a part-spherical surface that extends from the first enlarged lip, and an annular groove that extends from the second enlarged lip to the part-spherical surface, wherein the first opening has a larger diameter than the second opening, wherein the annular groove is axially positioned closer to the second end surface than to the first end surface;
- heat treating the annular case;
- and
- installing an interaxle differential unit gear nest inside the annular case.
2 more elements
Dependencies are inferred from the claim text.