• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A fuel injection pump for internal combustion engines having an electromagnetic final control element, which in order to adjust the end or onset of injection engages a control slide, located in the pump interior. Via a control shaft, the final control element chamber is hermetically sealed off from the pump interior in order to keep water contained in the fuel from reaching current-carrying parts of the final control element. As a result, fluid communication exists only via the bearing gap of the slide bearing of the control shaft and the bearing gap functions as a throttle. The throttle forms a water separator, which further reduces the concentration of water in the already small quantity of fuel reaching the final control element chamber through the throttle.
    公开号:SU1570656A3
    申请号:SU884355145
    申请日:1988-02-12
    公开日:1990-06-07
    发明作者:Фельманн Вольфганг；Хефер Гераль；Юнгер Дитер；Карле Антон；Лауфер Хельмут
    申请人:Роберт Бош Гмбх (Фирма)；
    IPC主号:
    专利说明:

    There is an internal cavity 2, which is filled with fuel from the feed pump and in which the discharge section is a pump consisting of a sleeve 3 and a plunger 5 with filling slots 13, a distribution groove 59 with a reference channel 16 and an axial channel 14. At a plunger and a cut-off channel j are fitted with a time control body 20 which is driven by an electromagnetic control mechanism located in the control cavity 22, which is isolated from the internal cavity and communicates with it only through an annular gap 35 formed by the shaft 29 of the driving part and the sliding bearing. The regulated flow of fuel into the control cavity leads to a decrease in the flow of water into it, which makes it possible to increase the reliability of the electromagnetic control mechanism and the pump as a whole. 1 hp f-ly, 2 silt,
    The invention relates to mechanical engineering, in particular to engine-building, and can be used in fuel-injection equipment for internal combustion engines, more specifically in high-pressure distribution-type fuel pumps.
    The chain of the invention is to increase the service life of the pump.
    Fig. 1 shows a fuel pump, a general view in longitudinal section on - a diagram of switching the pump to the top: link system
    The fuel pump includes a housing 1 in which an internal cavity 25 is made filled with fuel under pressure. In the internal cavity 2 there is an injection section of the pump consisting of a sleeve 3 fixed in the head 4 and a plunger 5 installed in the sleeve 3 with the possibility of simultaneous rotational and return translational movements under the action of the drive shaft 6, the roller holder 7 and the end cam disc 8o. The drive shaft 6 simultaneously drives the feed pump 9, which feeds fuel through the feed pipe 10 o from the fuel tank 11 into the internal cavity 2 of the pump0; The pressure in the cavity 2 is determined by a pressure reducing valve (not shown), which sets this pressure depending on the revolutions at the water shaft 6, and the higher, the higher the revolutions
    v The pump is equipped with a hydraulic regulator 12 injection, hydraulically connected with an internal cavity 2 and
    0
    five
    0
    five
    five
    0
    five
    the supply line 10, and its working member is connected with the roller holder 7, converting the pressure change in the cavity 2 into the rotation of the roller holder 7. Thus, the start of injection of the fuel pump of the pump with increasing speed moves in the direction of advance.
    In the plunger 5 there are made filling longitudinal grooves 13 and an axial channel 14 communicating with a distribution groove 15 and a cut-off radial channel 16. In the head of the pump 4 there is a suction channel 17 in which an electromagnetic valve 18 is installed. Plunger 5 and bushing 3 form a working cavity 19 of the pump, which communicates with the internal cavity 2 when the suction stroke of the plunger 5 through the channel 17 and one of the filling grooves 13 and is filled with fuel0 On the plunger 5 in the cut-off zone Nala 16 exiting the cavity 2, is movable along the axis of channel 16 and overlapping .20 body controlling flow quantity of fuel injected by the plunger 5 under high pressure. For axial movement of the control body 20, an electric control mechanism 21 is provided, which is located in the control cavity 22 bounded by a casing 23 connected to the pump housing 1 to form a wall 24 "between the control cavity 21 and the internal cavity 2.
    The control mechanism consists of a core 25 of a rotating magnet 26, which is excited by a coil 27 on
    5-15
    U-shaped core 28. An anchor 25 of a rotating magnet 26 is connected to a driving part, which is made in the form of a shaft 29, one end of which is rigidly connected to the bark 25, and an eccentric 30, which cooperates with the fuel consumption control body 20, is made on the other end, ensuring the latter moves along the axis of the plunger 5. The shaft 29 of the driving part is housed in a sliding bearing formed by the inflow 31 of the housing 23 and the bearing bush 32 mounted in the opening of the inflow 31. The inflow 31 of the bearing is located in the opening 33, control cavity 22 from the internal cavity 20. The opening 33 is sealed relative to the tide 31 by the sealing ring 34, the ball 29 of the driving part is located in the bearing sleeve 32 with an annular gap 35, the control cavity 22 is connected with the fuel pipe 36 leading to the fuel tank 11, through a check valve 37 opening to the side of the drain. The internal cavity 2 is also communicated with the drain through the throttle 38,
    When the pump is running, the feed pump 9 supplies fuel from the tank 11 to the internal cavity 2 of the pump. The pressure of the fuel in the cavity 2 is maintained at 3-8 bar, and its surplus (up to 30 l / h) through the throttle 38 is drained into the tank 11. From the cavity 2, the fuel periodically enters the working cavity 19 and then through the axial channel 14, the distribution groove 15 is supplied by the plunger 5 to the engine cylinders. In addition, the fuel from the cavity 2 enters the control cavity 22 only through an annular gap 35 between the drive shaft 29 and the slide bearing sleeve 32. The size of this gap is 2-3 µm, which provides 30 cm of fuel into the control cavity. h This ratio of fuel flow into the control cavity 22 and the internal cavity results in
    566
    that the concentration of water in the fuel of the control cavity is 10% of the concentration of water in the fuel of the internal cavity 2 of the pump0 A relatively small amount of water precipitates due to very little turbulence at the bottom of the control cavity 22 and cannot affect the current-carrying parts of the electromagnetic control mechanism 21, which increases the duration pump service in general ,,
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    I. High-pressure fuel pump for an internal combustion engine, comprising a housing with an internal cavity filled with fuel under pressure, a working cavity of the pump limited by the plunger and communicated with the internal cavity during the suction stroke of the plunger located in the internal cavity of the housing
    control unit for the amount of fuel injected by the plunger under high pressure, the control cavity in which the electric control mechanism is located and which is separated from the internal cavity by the wall, and the driving part connecting the control mechanism with the control body and made in the form of a shaft installed with a gap in a sliding bearing, with the control cavity on the one hand communicating with the drain cavity, and on the other hand with the internal cavity through the gap formed between the driving part
    and a sliding bearing, the sliding bearing is located in the wall separating the control cavity and the internal cavity of the housing, characterized in that, in order to increase the service life of the pump, the control cavity is made isolated from the internal cavity.
    2, Pump according to claim 1, characterized in that a check valve is installed in the connection between the control cavity and the drain, opening in the direction of the drain
    38
    Editor I. Derbak
    Compiled by V. Dolgov Tehred L. Serdyukova
    Order 1461
    Circulation 441
    VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5
    Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101
    FIG. 2
    Proofreader A. Obruchar
    Subscription
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    同族专利:
    公开号 | 公开日
    JPS63201332A|1988-08-19|
    US4873956A|1989-10-17|
    GB2202281A|1988-09-21|
    KR880010232A|1988-10-07|
    GB2202281B|1991-04-03|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB697616A|1950-07-05|1953-09-23|Cav Ltd|Regulating means for liquid fuel injection pumps for internal combustion engines|
    DE2929176C2|1979-07-19|1986-08-14|Robert Bosch Gmbh, 7000 Stuttgart|Distributor fuel injection pumps for internal combustion engines|
    DE3004035C2|1980-02-05|1988-08-04|Robert Bosch Gmbh, 7000 Stuttgart, De|
    JPS56141028A|1980-04-04|1981-11-04|Nippon Denso Co Ltd|Electrical control device for injection pump|
    JPS57135232A|1981-02-13|1982-08-20|Nissan Motor Co Ltd|Electronic controlling device for fuel injection of internal combustion engine|
    JPH0348344B2|1982-04-19|1991-07-24|Toyota Motor Co Ltd|
    GB8326354D0|1983-10-01|1983-11-02|Lucas Ind Plc|Fuel pumping apparatus|
    DE3430654A1|1984-08-21|1986-03-06|Robert Bosch Gmbh, 7000 Stuttgart|FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES|
    DE3739198C1|1987-11-19|1989-05-03|Bosch Gmbh Robert|Fuel injection pump for internal combustion engines|DE3739198C1|1987-11-19|1989-05-03|Bosch Gmbh Robert|Fuel injection pump for internal combustion engines|
    US4977882A|1988-08-26|1990-12-18|Diesel Kiki Co., Ltd.|Distributor type fuel injection pump|
    DE3928718A1|1989-08-30|1991-03-07|Bosch Gmbh Robert|FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES|
    DE3943299A1|1989-12-29|1991-07-04|Bosch Gmbh Robert|FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES|
    DE4019642A1|1990-06-20|1992-01-02|Bosch Gmbh Robert|FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES|
    DE4116644A1|1991-05-22|1992-11-26|Kloeckner Humboldt Deutz Ag|FUEL INJECTION DEVICE FOR DIESEL INTERNAL COMBUSTION ENGINES|
    FR2915242B1|2007-04-23|2009-07-03|Inst Francais Du Petrole|METHOD FOR CONTROLLING COMBUSTION OF A DIESEL ENGINE|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19873704578|DE3704578A1|1987-02-13|1987-02-13|FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES|
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