| 摘要 |
PURPOSE:To improve operation and fuel efficiency and remove harmful components from exhaust gas, by providing a fuel injection valve fitted with a swirler and located coaxially with an intake passage and by placing the fuel injection range of the valve in between the valve and a throttle valve which is at a low degree of opening. CONSTITUTION:A fuel injection valve 5 fitted with a swirler 20 for causing injected fuel to revolve is placed coaxially with an intake passage. The range 17 of fuel injection from the valve 5 is positioned so that the injected fuel does not directly collide against the wall of the intake passage. The swirler 20 is placed between an injection port and an orifice 22 and has many spiral grooves for causing the injected fuel to revolve. The atomized fuel rushes not in the central and peripheral regions A, C of the intake passage but in its intermediate region B. The fuel injection range 17 is fixed. Although the inclination of a throttle valve 4 changes, all the injected fuel collides against it up to a degree (20 deg.) of opening. When the degree of opening of the throttle valve 4 has risen to 40 deg. and 60 deg., the portion of the injected fuel outside the projected area of the throttle valve is sharply increased. As a result, an appropriate mixture is supplied in all stages of operation. |
