Bosch Automotive Systems Corporation

Bosch Corporation

Kazuya Kubota

Norio Matsuda

Nobuo Aoki

Noriyuki Kobayashi

Tetsuya Kuwayama

Takeshi Terada

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.

Fuel supply pump and tappet structure body

In a fuel supply devicein which high-pressure fuel in the inside of a common railwhich accumulates the high-pressure fuel supplied from a fuel pumpunder pressure is supplied to an internal combustion engine by fuel injection valves, and the fuel pumpincludes a plurality of high-pressure plungerstowhose high-pressure-fuel injection timings are shifted from each other, a portion or all of high-pressure pipestowhich connect fuel outlet portsPtoPof high-pressure plungerstowith the common railare connected with each other by connection pipestothus 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.

Fuel supply device

In a method for driving a solenoid proportional control valve () 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 (E), when an operating condition liable to cause hysteresis in the operation of the solenoid proportional control valve () is present, the peak value or pulse width of the pulse voltage is temporarily increased to instantaneously boost the driving force of the solenoid (E), thereby ensuring smooth operation of a piston (C) and stabilizing the flow rate control.

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Saitama, Japan

Kazuya Kubota