JPWO2021161553A5 - - Google Patents

Claims (6)

A main room, a sub-chamber partitioned by the main room and a partition wall, a plurality of communication passages provided in the partition wall and communicating the main room and the sub-chamber, and a central axis or the central axis of the sub-chamber. It is provided with a spark plug provided in the vicinity for igniting the air-fuel mixture in the sub-chamber and a fuel injection valve for injecting fuel into the main room, and is formed in the sub-chamber by ignition of the air-fuel mixture in the sub-chamber. A sub-chamber spark ignition engine that ignites the air-fuel mixture in the main chamber by injecting a flame into the main chamber through the communication passage.
The passage is
A swirl flow generation communication passage formed at an angle inclined with respect to the central axis of the sub chamber and generating a swirl flow in the sub chamber by compressed air from the main chamber.
A fuel inflow passage that is formed at an angle different from that of the swirl flow generation communication passage with respect to the direction toward the central axis of the sub chamber and supplies fuel from the main chamber side to the sub chamber is included.
The sub-chamber spark ignition engine, characterized in that the fuel inflow communication passage is located in the fuel injection range from the fuel injection valve. The swirl flow generation communication passage and the fuel inflow communication passage are formed on one end side of the sub chamber, and the spark plug is formed on the other end side of the sub chamber.
The swirl flow generation communication passage and the fuel inflow communication passage are formed so as to be inclined from one end side toward the other end side toward the sub chamber from the main chamber, and are an extension of the fuel inflow communication passage. The position where the line reaches the sub-chamber wall surface, which is the surface of the partition wall on the sub-chamber side, is on the other end side of the position where the extension line of the swirl flow generation communication passage reaches the sub-chamber wall surface. The sub-chamber spark ignition engine according to claim 1. The other end side of the sub-chamber wall surface is a cylindrical inner wall surface formed in a cylindrical shape.
The sub-chamber spark ignition engine according to claim 2, wherein the extension line of the fuel inflow passage reaches the cylindrical inner wall surface. A reduced-diameter inner wall surface is formed on one end side of the sub-chamber wall surface with respect to the cylindrical inner wall surface, in which the cross-sectional area gradually decreases from the other end side toward the one end side. The sub-chamber spark ignition engine according to claim 3. The aspect according to any one of claims 2 to 4, wherein a recess is formed on one end side of the partition wall on the main chamber side, and the fuel inflow communication passage is formed in the recess. Sub-chamber spark ignition engine. The sub-chamber spark ignition engine according to claim 5, wherein the recess is provided with a receiving surface on which the direct-injection fuel from the fuel injection valve collides.