Toyota Jidosha Kabushiki Kaisha

Yoshiyuki Tamaki

Shizuo Sasaki

Daisaku Sawada

Keiso Takeda

Masaki Mitsuyasu

Nobuhiko Koga

Eiji Hashimoto

A fuel injection valve with improved fuel atomization which has a valve body, a needle valve accommodated in the valve body for opening and closing a fuel path at a sealing portion, and a metering member provided at a front end of the valve body and having a plurality of nozzle holes for metering a fuel and determining the fuel-injecting direction. The fuel injection valve comprises an inner wall of the valve body located downstream of the sealing portion which is shaped to be gradually contiguous to an upstream side surface of the metering member, and an intermediate surface of the needle valve for connecting the sealing portion and the most-downstream side bottom surface of the needle valve with each other forming the fuel path sloped inward in the downstream direction in association with the inner wall for introducing the fuel into the nozzle holes formed in the metering member when the needle valve is in an open state, wherein the intermediate surface of the needle valve being shaped in such a manner that a virtual intersecting line of a virtual linear extension of the intermediate surface and the upstream side surface of the metering member is positioned outside of a virtual circle circumscribing the upstream side openings of the nozzle holes formed in the metering member when the needle valve is in an open state.

Fuel injection valve

A fuel injector for an internal combustion engine includes a valve body which has a nozzle at one end. A stopper plate is located at the other end of the valve body and has a path for communicating between the upstream and the downstream sides of said stopper plate itself. A needle valve is slidably disposed in the valve body for opening and closing the nozzle. A lift stopper is fixed to the needle valve for limiting the stroke of the needle valve in association with the stopper plate and has at least one path for communicating between the upstream and downstream sides of the lift stopper itself. A first needle guide is fixed to the needle valve at the downstream side of the lift stopper and has at least one path for communicating the upstream and the downstream sides of the first needle guide itself. A second needle guide is fixed to the needle valve at the upstream side of the lift stopper and has at least one path for communicating the upstream and the downstream sides of the second needle guide itself. The second needle guide guides the needle valve so that the needle valve is correctly moved, along the center axis, in association with the first needle guide.

Fuel injector for an internal combustion engine

A fuel injection valve includes a fuel swirl generation device, a main fuel injection hole having a comparatively large diameter, and a subsidiary fuel injection hole having a comparatively small diameter. The inclination of the main fuel injection hole with respect to an axis of the fuel injection valve is small so that a fuel swirl remains in the fuel injected therethrough. The inclination of the subsidiary fuel injection hole is great so that the swirl operates so as to push out the fuel through the subsidiary fuel injection hole. The fuel injected through the main fuel injection hole spreads due to the centrifugal force acting on the swirling fuel without depending on an intake gas swirl. The fuel injected through the subsidiary fuel injection hole has a strong penetrating force and can reach the vicinity of a spark plug. This improves ignition without depending on an intake gas swirl. Thus, good combustion is obtained over an entire operation range of a direct fuel injection type engine.

Fuel swirl generation type fuel injection valve and direct fuel

An internal combustion engine comprising a fuel injector for injecting fuel directly into a cylinder and a calculating device for calculating a calculated amount of fuel to be injected on the basis of an engine operating state. The fuel injector injects all of the calculated amount of fuel during a compression stroke when the calculated amount of fuel is smaller than a predetermined first amount of fuel, and injects a part of the calculated amount of fuel during an approximately first half of an intake stroke and injects a remaining part of the calculated amount of fuel during a compression stroke when the calculated amount of fuel is equal to or larger than a predetermined second amount of fuel which is larger than the predetermined first amount of fuel.

Internal combustion engine

In a direct fuel injection type spark ignition internal combustion engine, fuel is assisted in evaporation by a squish flow. The engine includes a squish portion for generating the squish flow, a spark plug located adjacent to a center of a cylinder, and a fuel injector. The squish portion is enlarged so as to closely oppose the spark plug at the opening end of the squish portion. The fuel injector is located at a closed end of the squish portion and injects at least one portion of the fuel onto either one of two squish portion defining surfaces defining the squish portion therebetween. Evaporation of the fuel injected onto and adhering to the squish portion defining surface is promoted by the squish flow before being ignited by the spark plug.

Growing community of inventors

Susono, Japan

Yoshiyuki Tamaki