Method for bonding piston components

Patent metadata

Field	Value
Publication number	US-9566670-B2
Application number	US-201414266771-A
Country	US
Kind code	B2
Filing date	Apr 30, 2014
Priority date	Apr 30, 2013
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

An exemplary method of making a piston assembly may include providing a piston crown defining at least in part an upper combustion bowl surface. The piston crown includes at least one crown mating surface. The method further comprising moving the crown mating surface in proximity to a skirt mating surface defined by a piston skirt, wherein the crown and skirt cooperate to define a cooling gallery extending about a periphery of the crown. The method may further include bonding the crown and skirt together by initiating an electric current along a conductive path between the crown and skirt mating surfaces, the conductive path comprising at least one conductive material extending from the crown mating surface to the skirt mating surface.

First claim

What is claimed is:

1. A method, comprising:
providing a piston crown defining at least in part an upper combustion bowl surface, the piston crown including an inner crown mating surface and an outer crown mating surface;
moving the crown mating surfaces in proximity to an inner skirt mating surface and an outer skirt mating surface defined by a piston skirt,
bonding the crown and skirt together in a resistance brazing process wherein the crown and skirt cooperate to define a cooling gallery extending about a periphery of the crown, such that a first conductive path is formed to one side of the cooling gallery and a second conductive path is formed to another side of the cooling gallery by initiating an electric current along the first and second conductive paths between the crown and skirt mating surfaces to either side of the cooling gallery, the bonding steps including:
1) bonding the crown and skirt together through the first path which is defined by the inner crown mating surface and the inner skirt mating surface to form a first bond to the one side of the cooling gallery, which allows the second conductive path which is defined by the outer crown mating surface and the outer skirt mating surface to form to the another side of the cooling gallery, causing the conductive path to form on both sides of the cooling gallery; or
2) bonding the crown and skirt together through the second path which is defined by the outer crown mating surface and the outer skirt mating surface to form a second bond to the another side of the cooling gallery, which allows the first conductive path which is defined by the inner crown mating surface and the inner skirt mating surface to form to the one side of the cooling gallery, causing the conductive path to form on both sides of the cooling gallery.

2. The method of claim 1 , wherein bonding the crown and skirt together includes positioning a brazing material between the crown and skirt mating surfaces, the brazing material included in the conductive path.

3. The method of claim 1 , wherein bonding the crown and skirt together includes contacting the crown and skirt mating surfaces directly together such that the conductive path comprises the crown and skirt mating surfaces.

4. The method of claim 1 , further comprising maintaining a position of the crown and skirt with respect to the first and second conductive paths while heating at least one of a crown material, a skirt material, and a brazing material to a melt temperature associated with the at least one of the crown material, the skirt material, and the brazing material.

5. The method of claim 1 , wherein the first conductive path includes a first skirt mating surface in contact with a first crown mating surface, and the second conductive path includes a second skirt mating surface in contact with a second crown mating surface.

6. The method of claim 5 , further comprising initiating the electric current along the first conductive path and the second conductive path such that the electrical current passes as a differential current to both sides of the cooling gallery.

7. The method of claim 6 , wherein a first bond is formed along the first conductive path and a second bond is formed along the second conductive path.

Assignees

• Mahle Int Gmbh

Inventors

• Gabriel Dieter
• Rein Wolfgang

Classifications

• B23K2201/003

  Operations & Transport · mapped topic

• B23K11/14

  Projection welding · CPC title

• Y10T29/49266

  Gudgeon pin, wrist pin, piston pin, or boss therefor · CPC title

• Y10T29/49258

  with thermal barrier or heat flow provision · CPC title

• F02F2003/0038

  by brazing · CPC title