Welded engine block for small internal combustion engines

Patent metadata

Field	Value
Publication number	US-9581106-B2
Application number	US-201414569020-A
Country	US
Kind code	B2
Filing date	Dec 12, 2014
Priority date	Jul 9, 2013
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

A small air-cooled internal combustion engine includes an aluminum cylinder block, an aluminum cylinder head welded to the aluminum cylinder block, and a weld securing the aluminum cylinder block to the aluminum cylinder head, wherein a joint having a first length is formed between the aluminum cylinder block and the aluminum cylinder head and wherein the weld extends for a second length that is at least 25% of the first length.

First claim

What is claimed is:

1. A small air-cooled internal combustion engine, comprising:
an aluminum cylinder block;
an aluminum cylinder head; and
a weld securing the aluminum cylinder block to the aluminum cylinder head, wherein a joint having a first length is formed between the aluminum cylinder block and the aluminum cylinder head and wherein the weld extends for a second length that is between 30% and 70% of the first length.

2. The small air-cooled internal combustion engine of claim 1 , wherein the joint extends between an exterior surface of the aluminum cylinder block and the aluminum cylinder head and an interior surface the aluminum cylinder block and the aluminum cylinder head and wherein the weld extends from the exterior surface toward the interior surface.

3. The small air-cooled internal combustion engine of claim 1 , further comprising:
a valve seat welded to the aluminum cylinder head.

4. The small air-cooled internal combustion engine of claim 1 , further comprising:
an aluminum crankcase cover welded to the aluminum cylinder block.

5. The small air-cooled internal combustion engine of claim 1 , further comprising:
a valve seat locally alloyed into the aluminum cylinder head.

6. The small air-cooled internal combustion engine of claim 1 , further comprising:
an aluminum head plate welded to the aluminum cylinder head.

7. The small air-cooled internal combustion engine of claim 1 , further comprising:
a second aluminum cylinder head welded to the aluminum cylinder block.

8. The small air-cooled internal combustion engine of claim 1 , wherein the weld comprises a continuous circumferential weld formed around the joint between the aluminum cylinder block and the aluminum cylinder head.

9. The small air-cooled internal combustion engine of claim 1 , further comprising:
a push rod manifold including a plurality of guide tubes, wherein the push rod manifold is attached between the aluminum cylinder block and the aluminum cylinder head; and
a push rod positioned within each guide tube.

10. The small air-cooled internal combustion engine of claim 9 , wherein the push rod manifold is formed of plastic.

11. The small air-cooled internal combustion engine of claim 9 , wherein the push rod manifold includes a breather chamber.

12. The small air-cooled internal combustion engine of claim 9 , wherein the push rod manifold includes a carburetor adaptor.

13. The small air-cooled internal combustion engine of claim 1 , further comprising:
a pair of push rod tubes attached between the aluminum cylinder block and the aluminum cylinder head.

14. A small air-cooled internal combustion engine, comprising:
an aluminum cylinder block;
an aluminum cylinder head; and
a weld securing the aluminum cylinder block to the aluminum cylinder head, wherein a joint having a first length is formed between the aluminum cylinder block and the aluminum cylinder head, wherein the joint extends between an exterior surface of the aluminum cylinder block and the aluminum cylinder head and an interior surface of the aluminum cylinder block and the aluminum cylinder head, and wherein the weld extends from the exterior surface toward the interior surface for a second length that is between 30% and 70% of the first length.

15. The small air-cooled internal combustion engine of claim 14 , wherein the weld comprises a continuous circumferential weld formed around the joint between the aluminum cylinder block and the aluminum cylinder head.

16. The small air-cooled internal combustion engine of claim 14 , further comprising:
a valve seat welded to the aluminum cylinder head.

17. The small air-cooled internal combustion engine of claim 14 , further comprising:
an aluminum crankcase cover welded to the aluminum cylinder block.

18. The small air-cooled internal combustion engine of claim 14 , further comprising:
a valve seat locally alloyed into the aluminum cylinder head.

19. The small air-cooled internal combustion engine of claim 14 , further comprising:
an aluminum head plate welded to the aluminum cylinder head.

Assignees

• Briggs & Stratton Corp

Inventors

• Schenkel Jerry
• Greenlees Gary D
• Hoerig Claude
• Carlson Mike L

Classifications

• F02F1/04

  for air cooling · CPC title

• F02F1/28

  for air cooling · CPC title

• F02B2275/02

  Attachment or mounting of cylinder heads on cylinders · CPC title

• F02F7/0085

  Materials for constructing engines or their parts · CPC title

• F02B63/02

  for hand-held tools · CPC title