Claims
- 1. A direct cylinder injected, internal combustion engine comprising a cylinder body defining at least one cylinder bore in which a piston reciprocates, a cylinder head affixed to an end of said cylinder body for closing said cylinder bore and defining with said piston and said cylinder bore a combustion chamber, a fuel injector having a nozzle for spraying fuel directly into said combustion chamber for combustion therein, at least one of said cylinder body and said cylinder head being provided with a cooling jacket therein, said fuel injector being inserted into a boss formed on said cylinder head so that said nozzle of said fuel injector is exposed to said combustion chamber, a water passage being formed in said cylinder head, at least a part of said boss being placed in said cooling water passage, and said cooling jacket and said cooling water passage being connected with each other by means of a bypass.
- 2. A direct cylinder injected, internal combustion engine as set forth in claim 1 wherein said engine further comprises a water pump for supplying cooling water and the cooling water is primarily supplied to said cooling jacket and then supplied to said cooling water passage.
- 3. A direct cylinder injected, internal combustion engine as set forth in claim 2 wherein said bypass exists in the proximity of said boss.
- 4. A direct cylinder injected, internal combustion engine as set forth in claim 2 wherein said bypass comprises a plurality of passes being disposed around said boss.
- 5. A direct cylinder injected, internal combustion engine as set forth in claim 2 wherein said engine further comprises a spark plug for firing the injected fuel, said spark plug being inserted into a boss formed on said cylinder head so that a spark gap of said spark plug is exposed to said combustion chamber, said fuel injector boss and said spark plug boss are connected with each other so as to make a wall that obstructs flow of the cooling water and said bypass forms a detour for the obstructed water flow.
- 6. A direct cylinder injected, internal combustion engine as set forth in claim 5 wherein an inlet portion of said bypass opens to the backwater that is made at said wall.
- 7. A direct cylinder injected, internal combustion engine as set forth in claim 6 wherein a dam is formed at least immediately ahead of an outlet of said bypass.
- 8. A direct cylinder injected, internal combustion engine as set forth in claim 1 wherein a heat exchanger medium is provided between the inside wall of said boss and said fuel injector.
- 9. A direct cylinder injected, internal combustion engine as set forth in claim 1 wherein a cooling cavity is provided between said boss and said fuel injector and said cooling cavity is connected with one of said cooling jacket and said cooling water sage.
- 10. A direct cylinder injected, internal combustion engine as set forth in claim 1 wherein said cylinder body comprises a plurality of vertically spaced, horizontally extending cylinder members, each cylinder member is provided with said bypass and the cooling water is supplied primarily to the lowermost cylinder member and then goes to upper cylinder members in sequence.
- 11. A direct cylinder injected, internal combustion engine as set forth in claim 1 wherein said engine operates on a two cycle crankcase compression principle and said fuel injector is disposed on the side of said exhaust port.
- 12. A direct cylinder injected, internal combustion engine as set forth in claim 1 wherein said engine operates on a four cycle principle.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-79459 |
Mar 1998 |
JP |
|
PRIORITY INFORMATION
[0001] This application is a divisional application of U.S. patent application Ser. No. 08/277,231 filed Mar. 26, 1999, the entire contents of which is hereby expressly incorporated by reference and also claims priority to Japanese Patent Application No. 10-79459, filed Mar. 26, 1998, the entire contents of which is hereby expressly incorporated by reference.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09277231 |
Mar 1999 |
US |
Child |
09968710 |
Oct 2001 |
US |