Welded engine block for small internal combustion engines
View Patent ↗A small air-cooled internal combustion engine includes an aluminum cylinder block and an aluminum cylinder head welded to the aluminum cylinder block.
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.