JPH0214465U

JPH0214465U -

Info

Publication number: JPH0214465U
Application number: JP9092688U
Authority: JP
Priority date: 1988-07-11
Filing date: 1988-07-11
Publication date: 1990-01-30

Description

[Brief explanation of drawings]

第１図は第２図の吐出量制御装置の拡大側面断
面図、第２図は加圧燃料供給制御装置の側面断面
図、第３図は第２図の―線に沿つてみた燃料
供給ポンプの断面図、第４図はデイーゼル機関の
全体図、第５図は吐出量制御装置の別の実施例の
拡大側面断面図、第６図はプランジヤの吐出行程
と溢流制御弁の閉弁時期との関係を示す線図であ
る。４０……燃料溢流通路、４１……燃料溢流室、
４２……溢流制御弁、４６……加圧ピストン、４
７……ピエゾ圧電素子、４８……加圧室、５０…
…加圧ピン、５２……背圧室、５４，６０……燃
料流出孔、７０……逆止弁、７２……可変絞りポ
ート、７３……固定絞り。 Figure 1 is an enlarged side sectional view of the discharge amount control device in Figure 2, Figure 2 is a side sectional view of the pressurized fuel supply control device, and Figure 3 is the fuel supply pump seen along the line - in Figure 2. 4 is an overall view of the diesel engine, FIG. 5 is an enlarged side sectional view of another embodiment of the discharge amount control device, and FIG. 6 is the discharge stroke of the plunger and the closing timing of the overflow control valve. FIG. 40...Fuel overflow passage, 41...Fuel overflow chamber,
42... Overflow control valve, 46... Pressurizing piston, 4
7... Piezo piezoelectric element, 48... Pressurizing chamber, 50...
... Pressure pin, 52 ... Back pressure chamber, 54, 60 ... Fuel outflow hole, 70 ... Check valve, 72 ... Variable throttle port, 73 ... Fixed throttle.

Claims

[Scope of utility model registration request]

A discharge amount control device that controls the discharge amount of the fuel supply pump by branching a fuel overflow passage from the pressurized fuel passage of the fuel supply pump and controlling the amount of fuel overflowing from the fuel overflow passage. , comprising an overflow control valve that connects the fuel overflow passage to a valve port opening into the fuel overflow chamber and controls the opening and closing of the valve port, and urges the overflow control valve in the closing direction of the valve port. A back pressure chamber is formed at the end of the overflow control valve on the opposite side of the fuel overflow chamber, and a compression spring provided in the back pressure chamber causes the overflow control valve to move in the opening direction of the valve port. and a check valve that allows the fuel to flow only from the fuel overflow chamber to the back pressure chamber, and a fuel connected to the back pressure chamber through a throttle arranged in parallel with the check valve. Supply pump discharge rate control device.