| 摘要 |
PURPOSE: To increase the sealability by devising dimensions of inner and outer shoulders restricting each annular groove for mounting a packing ring formed on outer periphery of a bottom member and a flow-out pipe in a pressure regulation valve arranged in a fuel distribution conduit of a fuel injection device. CONSTITUTION: A fuel distribution conduit 1 of a fuel injection device has a plurality of insertion connection parts 2 in which a fuel injection valve is mounted and a communicating hole 5 opened in a fuel distribution passage 3, and a flow-out connection part 11 is fixed on the coaxial line with the communicating hole 5. A pressure regulation valve 17 which flows fuel from a flow-out pipe 24 to a flow-out passage 16 when a greater pressure than an operation pressure is generated is arranged in a guide hole 6 and a hold hole 7 formed concentrically with the communicating hole 5. In this case, a diameter of an inner shoulder 27 restricting an annular groove 26 is smaller than that of an outer shoulder 28 and a diameter of an inner shoulder 32 restricting an annular groove 31 is smaller than that of an outer shoulder 33 in the annular grooves 26, 31 for mounting packing rings 29, 34 formed in the flow-out pipe 24 and a bottom member 23. |
