초록 ▼

In a fuel supply device 1 in which high-pressure fuel in the inside of a common rail 2 which accumulates the high-pressure fuel supplied from a fuel pump 6 under pressure is supplied to an internal combustion engine by fuel injection valves, and the fuel pump 6 includes a plurality of high-pressure

In a fuel supply device 1 in which high-pressure fuel in the inside of a common rail 2 which accumulates the high-pressure fuel supplied from a fuel pump 6 under pressure is supplied to an internal combustion engine by fuel injection valves, and the fuel pump 6 includes a plurality of high-pressure plungers 61 to 64 whose high-pressure-fuel injection timings are shifted from each other, a portion or all of high-pressure pipes 11 to 14 which connect fuel outlet ports 6P1 to 6P4 of high-pressure plungers 61 to 64 with the common rail 2 are connected with each other by connection pipes 30 to 33 thus establishing a state in which the high-pressure fuel from substantially one high-pressure plunger is supplied using the plurality of high-pressure pipes whereby the elevation of fuel pressures in the inside of the high-pressure pipes can be suppressed.

대표청구항 ▼

The invention claimed is: 1. A fuel supply device (1) comprising: a fuel pump (6); a common rail (2) which accumulates a high-pressure fuel which is supplied from the fuel pump (6) under pressure; and a fuel injection valve (3) which is capable of supplying the high-pressure fuel accumulated in the

The invention claimed is: 1. A fuel supply device (1) comprising: a fuel pump (6); a common rail (2) which accumulates a high-pressure fuel which is supplied from the fuel pump (6) under pressure; and a fuel injection valve (3) which is capable of supplying the high-pressure fuel accumulated in the inside of the common rail (2) to an internal combustion engine, the fuel pump (6) including a plurality of high-pressure generating portions (61, 62, 66 67) whose high-pressure-fuel injection timings are shifted from each other, wherein the fuel supply device (1) includes a plurality of high-pressure pipes (11 to 14) which are provided corresponding to the plurality of high-pressure generating portions (61, 62, 66, 67) and connect fuel outlet ports (6P1 to 6P4) of the corresponding high-pressure generating portions (61, 62, 66, 67) with corresponding inlet ports (2P1 to 2P4) of the common rail (2), and a connection pipe (30 to 33) which connects at least two or more high-pressure pipes (11, 12, 12, 13, 13, 14) out of the plurality of high-pressure pipes (11 to 14) with each other in the vicinity of the corresponding fuel outlet ports (6P1 to 6P4); characterized in that: each of the high-pressure pipes (11 to 14) is provided between one inlet port (2P1 to 2P4) and only one of the outlet ports (6P1 to 6P4), wherein each of the high-pressure pipes (11 to 14) is directly connected to only one high-pressure generating portion (61, 62, 66, 67) via the corresponding fuel outlet port (6P1 to 6P4) and an outlet valve (V3, V4) arranged in the fuel pump (6); and the connection pipe (30 to 33) is arranged to directly connect the at least two or more high-pressure pipes (11 to 14) with each other between the both ends of each of the at least two or more high-pressure pipes (11 to 14).