# US 5,341,866 A · Method for the incorporation of a component into a piston

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- Number: US 5,341,866 A
- Document ID: US5341866A
- Status: Granted
- Kind: A
- Application number: 07/796,436
- Filed: 1991-11-22
- Granted: 1994-08-30
- Earliest claimed: 1989-08-26
- Assignees: AE Piston Products Limited
- Inventors: Robert Munro
- Web page: https://patentgrep.com/patent/US5341866A

## CPC

- F02F 3/00: Pistons
- F16J 1/16: with gudgeon-pin; Gudgeon-pins
- F16J 9/22: Rings for preventing wear of grooves or like seatings
- F05C 2201/021: Aluminium
- F05C 2201/0448: Steel
- F05C 2203/0882: Carbon, e.g. graphite
- Y10T 29/49249: Piston making
- Y10T 29/49256: with assembly or composite article making
- Y10T 29/49265: Ring groove forming or finishing
- Y10T 29/49266: Gudgeon pin, wrist pin, piston pin, or boss therefor
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A porous body is formed and joined to the component by sintering a metal powder to the component. The porous body and component are placed into a piston casting die. Molten metal is poured into the die such that the porous body becomes infiltrated with the molten metal and the molten metal is allowed to solidify. The porous body may be formed by sintering loose metal powder to the component, or by forming a separate body by die pressing of metal powder and which body may be subsequently sintered and joined to the component.

## Claims

### Claim 1

A method for the incorporation of a component into a piston, the method comprises the steps of forming and joining a porous body to the component by sintering a metal powder to the component, placing the porous body and component into a piston casting die, pouring molten metal into the die such that said porous body becomes infiltrated with said molten metal and allowing said molten metal to solidify.

### Claim 2 (depends on 1)

A method according to claim 1 wherein the component is one or more selected from the group consisting of piston ring groove reinforcement, piston crown, combustion bowl, gudgeon pin boss bore reinforcements.

### Claim 3 (depends on 1)

A method according to claim 1 wherein said porous body is a separate body formed from a metal powder.

### Claim 4 (depends on 1)

A method according to claim 1 wherein said forming and joining of said porous body is by sintering a loose metal powder to said component.

### Claim 5 (depends on 1)

A method according to claim 1 wherein said porous body is formed from either a ferrous based powder or a copper based powder.

### Claim 6 (depends on 1)

A method according to claim 1 wherein said porous body is infiltrated by squeeze casting of the molten metal.

### Claim 7 (depends on 1)

A method according to claim 1 wherein said porous body is infiltrated by a vacuum or reduced pressure casting technique.

### Claim 8 (depends on 4)

A method according to claim 4 wherein said loose metal powder is located in a die.

### Claim 9 (depends on 3)

A method according to claim 3 wherein said metal powder is located in a die.

### Claim 10 (depends on 9)

A method according to claim 9 wherein said metal powder is die pressed in said die prior to said sintering.