JP-7856058-B2 - Internal combustion engine

Inventors

• 立花 三奈
• 鈴木 雄貴
• 土屋 富久

Assignees

• トヨタ自動車株式会社

Dates

Publication Date

20260511

Application Date

20230616

Claims (3)

1. An engine body having a combustion chamber in which an intake air and a mixture of gaseous fuel are burned, A fuel injection valve for injecting the gaseous fuel into the combustion chamber, A spark plug that ignites the aforementioned fuel mixture, It is equipped with, The engine body has a housing hole for housing the fuel injection valve and a connecting passage between the housing hole and the combustion chamber. The spark plug is located on the top dead center side with respect to the central axis of the fuel injection valve. The aforementioned communication passage is located on the bottom dead center side with respect to the central axis of the fuel injection valve. The central axis of the communication passage is inclined with respect to the central axis of the fuel injector such that it is located towards the bottom dead center direction as it approaches the injection direction of the fuel injector . The fuel injection valve has an injection port for the gaseous fuel, When the opening on the receiving hole side of the communication passage is projected onto the fuel injection valve in the direction the opening faces, the injection port is located outside the projection range of the opening. Internal combustion engine.
2. The fuel injection valve is equipped with a needle valve that opens and closes the injection port, The needle valve has a diamond-like carbon film on the portion facing the injection port. The internal combustion engine according to claim 1 .
3. The internal combustion engine according to claim 1, wherein the angle formed by the central axis of the communication passage and the central axis of the fuel injection valve, on the side of the gaseous fuel injection direction and the bottom dead center direction, is 45 degrees or less.

Description

This invention relates to an internal combustion engine. The internal combustion engine described in Patent Document 1 comprises a combustion chamber, an intake port, and an exhaust port. The combustion chamber is the space where the fuel-intake mixture burns. The intake port is a passage for guiding the intake air into the fuel chamber. The exhaust port is a passage for guiding the exhaust from the combustion chamber to the outside. Furthermore, the internal combustion engine described in Patent Document 1 also comprises a fuel injector and a spark plug. The fuel injector injects fuel directly into the combustion chamber without passing through the intake port. The spark plug ignites the fuel-intake mixture. Japanese Patent Application Publication No. 6-108851 Figure 1 is a schematic diagram of an internal combustion engine.Figure 2 is an end view of the fuel injection valve.Figure 3 is an enlarged end view of the cylinder head near the communication passage. The following describes one embodiment of an inductor component with reference to the drawings. Note that the drawings may show enlarged versions of components for ease of understanding. The dimensional ratios of the components may differ from those shown in the actual components or in other drawings. <Overall Configuration of an Internal Combustion Engine> As shown in Figure 1, the internal combustion engine E comprises an engine body 10. The engine body 10 consists of a cylinder block 11 and a cylinder head 12. The cylinder block 11 has cylinders 11A. Cylinders 11A are cylindrical spaces. Cylinders 11A are open at the end face of the cylinder block 11. Although only one set of cylinders 11A and their related configurations is shown in Figure 1, the internal combustion engine E has multiple cylinders 11A and their related configurations. The cylinder head 12 is connected to the end face of the cylinder block 11. The cylinder head 12 has a recess 12A, an intake port 12B, and an exhaust port 12C. The recess 12A is recessed on the end face of the cylinder head 12. The recess 12A is a roughly hemispherical space. The opening diameter of the recess 12A is the same as the inner diameter of the cylinder 11A. The recess 12A faces the cylinder 11A. These recesses 12A and cylinder 11A constitute a single combustion chamber R. The combustion chamber R is the space where the intake air and the mixture of gaseous fuel are burned. The intake port 12B is a passage for intake air supplied to the combustion chamber R. The first end of the intake port 12B is connected to the recess 12A. The second end of the intake port 12B is connected to an intake pipe (not shown). The exhaust port 12C is a passage for exhaust air discharged from the combustion chamber R. The first end of the exhaust port 12C is connected to the recess 12A. The second end of the exhaust port 12C is connected to an exhaust pipe (not shown). The internal combustion engine E comprises a piston 13, an intake valve 14, an exhaust valve 15, and a spark plug 16. The piston 13 is located within cylinder 11A. The piston 13 reciprocates within cylinder 11A in response to the combustion of the fuel-air mixture in the combustion chamber R. Although not shown in the diagram, the piston 13 is connected to the crankshaft via a connecting rod. The connecting rod and crankshaft convert the reciprocating motion of the piston 13 into rotational motion. In the following description, the direction of motion of the piston 13 when the fuel-air mixture in the combustion chamber R is compressed is referred to as the top dead center direction (UP), and the opposite direction is referred to as the bottom dead center direction (DW). The intake valve 14 is mounted on the cylinder head 12. The intake valve 14 opens and closes the first end of the intake port 12B. The intake valve 14 operates in synchronization with the reciprocating motion of the piston 13. The exhaust valve 15 is also mounted on the cylinder head 12. The exhaust valve 15 opens and closes the first end of the exhaust port 12C. The exhaust valve 15 operates in synchronization with the reciprocating motion of the piston 13. The spark plug 16 is mounted on the cylinder head 12. The spark plug 16 is located between the intake port 12B and the exhaust port 12C. The tip of the spark plug 16 is located within the recess 12A. The spark plug 16 ignites the fuel-air mixture in the combustion chamber R by spark discharge. The spark plug 16 ignites the fuel-air mixture in sync with the reciprocating motion of the piston 13. The internal combustion engine E is equipped with a fuel injector 20. The fuel injector 20 is mounted on the cylinder head 12. The fuel injector 20 injects gaseous fuel directly into the combustion chamber R, bypassing the intake port 12B. An example of gaseous fuel is hydrogen. As shown in Figure 2, the fuel injector 20 comprises a cylindrical body 21 and a needle valve 22. The cylindrical body 21 is generally cylindrical in shape. The first central axi