Pendulum assembly for a crankshaft pendulum having cast-in near net shape hardened inserts

Patent metadata

Field	Value
Publication number	US-9995367-B2
Application number	US-201514808610-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 24, 2015
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

A pendulum crankshaft for an internal combustion engine includes a pendulum crankshaft having pendulum crank rolling path inserts that are cast into the component during the casting process. The rolling path inserts are positioned in a mold prior to casting. By including the rolling path inserts in the component during the molding process, the need to press the rolling path insert into the component after the component is cast is thus avoided, thereby eliminating the resulting stresses that would otherwise result. Machining and subsequent heat treatment are unnecessary. The component can be one or both of the crankshaft pendulum and the pendulum carrier. The rolling path may be formed from a metal such as sintered powdered metal. The flowable material may be a metal such as iron. The resulting component is free of stress regions, such as on the carrier strap, that normally result from methods that involve press-fitting the rolling path insert into the component.

First claim

What is claimed is:

1. A method of producing a crankshaft pendulum assembly for an internal combustion engine, the method comprising:
forming a mold for a crankshaft pendulum assembly component, said component being selected from the group consisting of a pendulum carrier and a crankshaft pendulum;
forming a rolling path insert;
positioning said rolling path insert in said mold; and
subsequently injecting flowable material into said mold to form said component.

2. The method of producing a crankshaft pendulum assembly of claim 1 , wherein said rolling path insert is formed from a metal selected from the group consisting of sintered powdered metal and hardened steel.

3. The method of producing a crankshaft pendulum assembly claim 1 , wherein said flowable material is a molten metal.

4. The method of producing a crankshaft pendulum assembly claim 1 , wherein said flowable material is molten iron.

5. The method of producing a crankshaft pendulum assembly of claim 1 , wherein each of said components includes a pair of said rolling path inserts.

6. A method of producing a crankshaft pendulum assembly for an internal combustion engine, the method comprising:
forming a mold for a crankshaft pendulum assembly component;
forming a rolling path insert;
positioning said rolling path insert in said mold; and
subsequently injecting flowable material into said mold to form said component.

7. The method of producing a crankshaft pendulum assembly of claim 6 , wherein said crankshaft pendulum assembly component is a crankshaft pendulum.

8. The method of producing a crankshaft pendulum assembly of claim 6 , wherein said crankshaft pendulum assembly component is a pendulum carrier.

9. The method of producing a crankshaft pendulum assembly of claim 6 , wherein said rolling path insert is formed from a metal selected from the group consisting of sintered powdered metal and hardened steel.

10. The method of producing a crankshaft pendulum assembly claim 6 , wherein said flowable material is a molten metal.

11. The method of producing a crankshaft pendulum assembly claim 6 , wherein said flowable material is molten iron.

12. The method of producing a crankshaft pendulum assembly of claim 6 , wherein each of said components includes a pair of said rolling path inserts.

Assignees

• Ford Global Tech Llc

Inventors

• Chottiner Jeffrey Eliot
• Ostrander Paul Edward

Classifications

• B22C9/22 Primary

  Moulds for peculiarly-shaped castings · CPC title

• C21D9/0062

  Heat-treating apparatus with a cooling or quenching zone · CPC title

• F16F15/283 Primary

  for engine crankshafts · CPC title

• B22F5/007

  of moulds · CPC title

• B22C9/101

  Permanent cores · CPC title