Abstract: A fuel supply pump with a large fuel discharge amount and a tappet structure body, which are suitably used for an accumulated pressure-type fuel injection device that mechanically amplifies pressure, is provided. A fuel supply pump has a tappet structural body and a spring sheet, wherein a penetration portion for allowing passage of a lubricant or a fuel for lubrication therethrough by coordinating the tappet structure and the spring sheet is provided between a spring-holding chamber for holding a spring to be used for pulling up a plunger and a cam chamber for housing a cam to be used for moving the plunger up and down.

Abstract: 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.

Abstract: In a method for driving a solenoid proportional control valve (44) used for flow rate control of a common rail system pump adapted to regulate flow rate by regulating the duty ratio of a pulse voltage applied to a solenoid coil (F) of a solenoid (44E), when an operating condition liable to cause hysteresis in the operation of the solenoid proportional control valve (44) is present, the peak value or pulse width of the pulse voltage is temporarily increased to instantaneously boost the driving force of the solenoid (44E), thereby ensuring smooth operation of a piston (44C) and stabilizing the flow rate control.

Abstract: 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.

Abstract: In a fuel supply system (1), a fuel pressure regulating valve (11) disposed at a fuel outlet side of a low-pressure pump (3) in order to regulate the pressure of supply fuel from the low-pressure pump (3) to a predetermined pressure is housed inside a cylinder (31) such that a piston (32) is elastically urged by an elastic urging mechanism (33) toward a pressure receiving port (11A), the piston (32) is configured such that the pressure of the fuel at the fuel outlet side is regulated as a result of the piston opening/closing an overflow port (11B) disposed in a side wall portion of the cylinder (31) in response to the fuel pressure applied to the pressure receiving port (11A), a lubrication fuel outlet port (11C) for taking out fuel for lubrication is disposed in the side wall portion of the cylinder (31) at a position nearer to the pressure receiving port (11A) than the overflow port (11B), and lubricating-use fuel is taken out prior to the start of the pressure regulating operation.

Abstract: In a method for driving a solenoid proportional control valve (44) used for flow rate control of a common rail system pump adapted to regulate flow rate by regulating the duty ratio of a pulse voltage applied to a solenoid coil (F) of a solenoid (44E), when an operating condition liable to cause hysteresis in the operation of the solenoid proportional control valve (44) is present, the peak value or pulse width of the pulse voltage is temporarily increased to instantaneously boost the driving force of the solenoid (44E), thereby ensuring smooth operation of a piston (44C) and stabilizing the flow rate control.

Abstract: A fuel supply pump with a large fuel discharge amount and a tappet structure body, which are suitably used for an accumulated pressure-type fuel injection device that mechanically amplifies pressure, is provided. A fuel supply pump has a tappet structural body and a spring sheet, wherein a penetration portion for allowing passage of a lubricant or a fuel for lubrication therethrough by coordinating the tappet structure and the spring sheet is provided between a spring-holding chamber for holding a spring to be used for pulling up a plunger and a cam chamber for housing a cam to be used for moving the plunger up and down.

Abstract: A high flow rate fuel valve suitable for an accumulator fuel injection device by which a large amount of fuel is amplified using a piston and used and a fuel supply pump using the high flow rate fuel valve are provided. For this purpose, in a fuel supply pump with a fuel inlet valve and fuel outlet valve, the fuel inlet valve has a valve main body, a valve body received in the valve main body, an inlet chamber provided inside the valve main body, inlet holes, a seat portion where the valve body and part of valve main body are in contact with each other. The inlet holes are arranged in a non-radial pattern relative to the inlet chamber.

Abstract: A fuel supply pump, which is simple in construction and easy to produce and is capable of efficiently pressurizing a high flow rate of fuel, is provided. The fuel supply pump (50) includes a housing (52), a plunger barrel (53), a plunger (54) for pressurizing fuel, which is installed in the plunger barrel (53) so as to be allowed to move up and down, a cam (60) installed in rotation way below the plunger (54), a tappet structure body (6) installed between the cam (60) and the plunger (54) to transmitting the turning force, serving as a lifting force, from the cam shaft (3) to the plunger (54), a tappet structure body (6) installed between the cam (60) and the plunger (54) and provided for transmitting a upward or downward movement of the cam (60) caused by the rotation of the camshaft (3) to the plunger (54); and a return spring (68) for setting lowering force to the plunger (54), which is installed between the tappet structure body (6) and the plunger barrel (53).