| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gas injection valve capable of varying injection pressure of fuel gas while opening a needle valve.SOLUTION: When hydraulic oil pressure is given to a hydraulic chamber 51, an annular piston 43 and a piston extension part 44 are moved upwards, and an outer peripheral surface of a distal end portion of a needle valve 5 is separated from an inner edge portion of an opening 3a of a seat part 3. A needle valve spring receiver 45 and the needle valve 5 incur single vibration under the masses thereof and spring loads of first and second springs 49 and 50, and a flow passage area between the outer peripheral surface of the distal end portion of the needle valve 5 and the inner edge portion of the opening 3a of the seat part 3 is increased/decreased in response to upward/downward movement of the needle valve 5. Therefore, even while fuel gas G is supplied under fixed pressure to a gas supply passage 33, injection pressure of the fuel gas G to be supplied through a gas injection passage 34 into a cylinder is varied.</p> |
