Welded engine block for small internal combustion engines

Patent metadata

Field	Value
Publication number	US-9863363-B2
Application number	US-201414326185-A
Country	US
Kind code	B2
Filing date	Jul 8, 2014
Priority date	Jul 9, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A small air-cooled internal combustion engine includes an aluminum cylinder block and an aluminum cylinder head welded to the aluminum cylinder block.

First claim

What is claimed is:

1. A small air-cooled internal combustion engine, comprising:
a die-cast aluminum cylinder block having a gas porosity of 0.30 milliliters per 100 grams of aluminum or less; and
an aluminum cylinder head welded to the aluminum cylinder block.

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

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

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

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

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

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

8. 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.

9. The small air-cooled internal combustion engine of claim 8 , wherein the pushrod manifold is formed of plastic.

10. The small air-cooled internal combustion engine of claim 8 , wherein the pushrod manifold includes a breather chamber.

11. The small air-cooled internal combustion engine of claim 8 , wherein the pushrod manifold includes a carburetor adaptor.

12. 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.

13. A small air-cooled internal combustion engine, comprising:
a substantially-sealed engine block including a die-cast aluminum cylinder block having a gas porosity of 0.30 milliliters per 100 grams of aluminum or less.

14. The small air-cooled internal combustion engine of claim 13 , wherein the substantially-sealed engine block includes an aluminum cylinder head welded to the aluminum cylinder block; and wherein the substantially-sealed engine block does not include a head gasket positioned between the aluminum cylinder head and the aluminum cylinder block.

15. The small air-cooled internal combustion engine of claim 14 , wherein the substantially-sealed engine block further includes an aluminum crankcase cover welded to the aluminum cylinder block; and
wherein the substantially-sealed engine block does not include a crankcase gasket positioned between the aluminum crankcase cover and the aluminum cylinder block.

16. The small air-cooled internal combustion engine of claim 15 , wherein the substantially-sealed engine block does not include an oil fill tube.

17. The small air-cooled internal combustion engine of claim 14 , 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.

18. The small air-cooled internal combustion engine of claim 17 , wherein the pushrod manifold is formed of plastic.

19. The small air-cooled internal combustion engine of claim 17 , wherein the pushrod manifold includes an integrated breather chamber.

20. The small air-cooled internal combustion engine of claim 17 , wherein the push rod manifold includes a carburetor adaptor.

21. A small air-cooled internal combustion engine, comprising:
a die-cast aluminum cylinder block having a gas porosity of 0.30 milliliters per 100 grams of aluminum or less; and
an aluminum cylinder assembly welded to the aluminum cylinder block.

22. The small air-cooled internal combustion engine of claim 21 , wherein the aluminum cylinder assembly includes an aluminum cylinder bore and an aluminum cylinder head welded to the aluminum cylinder bore.

23. The small air-cooled internal combustion engine of claim 22 , further comprising:
a pair of push rod tubes attached between the aluminum cylinder block and the aluminum cylinder head.

24. The small air-cooled internal combustion engine of claim 22 , further comprising:
a push rod manifold including at least two 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.

25. The small air-cooled internal combustion engine of claim 21 , further comprising:
a second aluminum cylinder assembly welded to the aluminum cylinder block.

26. The small air-cooled internal combustion engine of claim 25 , wherein the second aluminum cylinder assembly includes a second aluminum cylinder bore and a second aluminum cylinder head welded to the second aluminum cylinder bore.

Assignees

• Briggs & Stratton Corp

Inventors

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

Classifications

• F02F7/0034

  Built from sheet material and welded casings · CPC title

• F02F7/0039 Primary

  Casings for small engines, especially with crankcase pumps · CPC title

• F02B63/02

  for hand-held tools · CPC title

• F02F1/045

  Attachment of cylinders to crankcase · CPC title