Method for producing a cylindrical hollow body made of aluminum or of an aluminum alloy or of a light metal alloy, cylindrical hollow body, and vehicle transmission

Patent metadata

Field	Value
Publication number	US-12420333-B2
Application number	US-202117794682-A
Country	US
Kind code	B2
Filing date	Jan 21, 2021
Priority date	Jan 23, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A method for producing a cylindrical hollow body ( 20 ) made of aluminum, an aluminum alloy, or a light metal alloy, includes casting a hollow body ( 20 ) such that the hollow body ( 20 ) has an inner and an outer lateral surface ( 21, 22 ) and two axial end faces. The method also includes, during the casting process, making at least one defined notch ( 35, 35 ′) into one or more of the inner lateral surface ( 21 ), the outer lateral surface ( 22 ), and the two axial end faces.

First claim

The invention claimed is:

1. A method for producing a cylindrical hollow transmission shaft ( 20 ) of aluminum, an aluminum alloy, or a light metal alloy, the method comprising:
casting the hollow transmission shaft ( 20 ) such that the hollow transmission shaft ( 20 ) has an inner lateral surface ( 21 ), an outer lateral surface ( 22 ), and two axial end faces and such that at least one defined notch ( 35 , 35 ′) is molded into one or more of the inner lateral surface ( 21 ), the outer lateral surface ( 22 ), and the two axial end faces; and
after the casting, at least partially skimming ( 3 ) the one or more of the inner lateral surface ( 21 ), the outer lateral surface ( 22 ), and the two axial end faces at the at least one defined notch ( 35 , 35 ′),
wherein the at least one defined notch ( 35 , 35 ′) remains on the one or more of the inner lateral surface ( 21 ), the outer lateral surface ( 22 ), and the two axial end faces after the at least partially skimming ( 3 ).

2. The method of claim 1 , wherein the casting is a diecasting process ( 1 ).

3. The method of claim 1 , wherein the least partially skimming ( 3 ) comprises at least partially skimming ( 3 ) one or both of the inner lateral surface ( 21 ) and the outer lateral surface ( 22 ) of the hollow transmission shaft ( 20 ).

4. The method of claim 1 , wherein casting the hollow transmission shaft ( 20 ) comprises casting the hollow transmission shaft ( 20 ) such that the hollow transmission shaft ( 20 ) has internal toothing ( 24 ) in at least one portion ( 23 , 23 ′) of the inner lateral surface ( 21 ).

5. The method of claim 4 , wherein casting the hollow transmission shaft ( 20 ) comprises casting the hollow transmission shaft ( 20 ) such that the hollow transmission shaft ( 20 ) has the internal toothing ( 24 ) in each of two portions ( 23 , 23 ′) of the inner lateral surface ( 21 ).

6. The method of claim 1 , further comprising balancing the hollow transmission shaft ( 20 ).

7. The method of claim 1 , further comprising one or more of:
deburring the hollow transmission shaft ( 20 );
brushing the hollow transmission shaft ( 20 ); and
washing the hollow transmission shaft ( 20 ).

8. The method of claim 1 , wherein a depth of the at least one defined notch ( 35 , 35 ′) is no less than two millimeters.

9. The method of claim 1 , wherein the hollow transmission shaft ( 20 ) is installable within a vehicle transmission ( 29 ) to transmit torque.

10. The method of claim 9 , wherein:
casting the hollow body ( 20 ) comprises casting the hollow body ( 20 ) such that the hollow body ( 20 ) has internal toothing ( 24 ) in at least one portion ( 23 , 23 ′) of the inner lateral surface ( 21 ); and
the internal toothing ( 24 ) is configured to mesh with a toothed disk in the vehicle transmission ( 29 ).

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Ruhl Christian
• Boehm Helmut

Classifications

• B22D25/02

  by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)} · CPC title

• B22D15/005 Primary

  of rolls, wheels or the like (B22D19/16 takes precedence) · CPC title

• B23P15/14

  gear parts, e.g. gear wheels · CPC title

• B22D31/002

  Cleaning, working on castings · CPC title

• F16H57/032

  characterised by the materials used · CPC title