Remanufactured prechamber device and method

Patent metadata

Field	Value
Publication number	US-10184387-B2
Application number	US-201715418437-A
Country	US
Kind code	B2
Filing date	Jan 27, 2017
Priority date	Jan 27, 2017
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A prechamber ignition assembly for an internal combustion engine includes a base attached to a remanufactured prechamber ignition device at a base weld interface. The remanufactured prechamber ignition device includes a new tip formed of a tip material, and a root formed of a root material, with a used body formed of a body material disposed therebetween. The new tip is bonded to the used body at a tip weld interface and the root is bonded to the used body at a root weld interface.

First claim

What is claimed is:

1. A method of making a prechamber ignition device for an internal combustion engine, the method comprising:
receiving a used prechamber assembly removed from service in the internal combustion engine, the prechamber assembly including a used prechamber device having a body structured for positioning at least partially within an engine cylinder, and a base coupled to the body for mounting the prechamber assembly in the internal combustion engine;
decoupling the used prechamber device from the base at least in part by cutting through a base weld attaching the used prechamber device to the base;
removing a used tip from the body, the used tip defining at least one ignition outlet;
attaching a new tip to the body in place of the used tip, the new tip being formed of a tip material compatible for welding with a body material of the body; and
forming at least one new ignition outlet in the new tip.

2. The method of claim 1 wherein attaching the new tip to the body includes depositing tip material in a molten form onto the body material such that the tip material is mixed with and metallurgically bonds to the body material at a tip weld interface.

3. The method of claim 2 wherein depositing tip material in a molten form further includes melting powdered tip material in a powder metal spray plume directed toward the body of the prechamber device.

4. The method of claim 2 further comprising positioning a form within the body prior to the depositing of the tip material such that a portion of the form protrudes from the body, and wherein the depositing of the tip material further includes depositing the tip material onto the body such that the protruding portion of the form is covered by the deposited tip material.

5. The method of claim 4 further comprising molding the deposited tip material about the form, and removing the form from the body to produce an inner surface of the new tip shaped in a mirror image of the shape of the form.

6. The method of claim 5 wherein the form has a bottle shape and the inner surface of the new tip is shaped in a mirror image of a narrow end of the bottle shape.

7. The method of claim 1 wherein the tip material includes a nickel-chromium alloy or a stainless steel, and the body material includes a nickel-chromium alloy or a stainless steel, salvaged from the used prechamber device.

8. A method of making a prechamber ignition device for an internal combustion engine, the method comprising:
receiving a used prechamber assembly removed from service in the internal combustion engine, the prechamber assembly including a used prechamber device having a body structured for positioning at least partially within an engine cylinder, and a base coupled to the body for mounting the prechamber assembly in the internal combustion engine;
removing a used tip from the body, the used tip defining at least one ignition outlet;
attaching a new tip to the body in place of the used tip, the new tip being formed of a tip material compatible for welding with a body material of the body;
wherein attaching the new tip to the body includes depositing tip material in a molten form onto the body material such that the tip material is mixed with and metallurgically bonds to the body material at a tip weld interface; and
forming at least one new ignition outlet in the new tip.

9. The method of claim 8 further comprising decoupling the used prechamber device from the base at least in part by cutting through a base weld attaching the used prechamber device to the base.

Assignees

• Caterpillar Inc

Inventors

• Graham Curtis
• Luick Kegan
• Cavanaugh Daniel
• Hatfield Darryl

Classifications

• B23K26/211

  with interposition of special material to facilitate connection of the parts · CPC title

• B23K1/00

  Soldering, e.g. brazing, or unsoldering (B23K3/00 takes precedence) · CPC title

• B23K26/60

  Preliminary treatment · CPC title

• B23K26/0006

  taking account of the properties of the material involved (B23K26/32, B23K26/40 take precedence) · CPC title

• B23K2101/003

  Pistons · CPC title