Fuel injection system of engine for models

Abstract

A fuel injection system having no fuel leakage and a high speed response includes both an outlet opening of a fuel supply passage 44 and an inlet opening 59 of an injection passage 56 are provided facing to a communication space 54 formed on the one end face of a valve box 51. A diaphragm 62 seals the communicating space of a valve box 51. A ridge 64 of the diaphragm 62 shuts the supply passage and injection passage. A valve body 70 driven by a solenoid coil 65 is combined with the diaphragm 62. The valve body 70 is pressed by a plate spring 71. While a current is not supplied to the solenoid coil 65, the plate spring 71 presses the valve body 70, and the ridge 64 of the diaphragm 62 closes the inlet opening 59 of the injection passage 56. Fuel is not injected. While a current is supplied to the solenoid coil 65, the valve body 70 is attracted toward a magnetic core 66. The ridge 64 leaves from the valve box 51, and the injection passage 56 is communicated to the supply passage 55 through the communication space 54. Fuel is injected. The valve body 70 does not receive resistance force from fuel, and a small force of the solenoid coil is sufficient for functioning. Fuel does not enter into the box 53, therefore fuel does not leak from a hole 69 for guiding a power supply wire 68 to the outside.