WO2014107979A1 - 喷射阀的电控喷油器 - Google Patents

喷射阀的电控喷油器 Download PDF

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Publication number
WO2014107979A1
WO2014107979A1 PCT/CN2013/085524 CN2013085524W WO2014107979A1 WO 2014107979 A1 WO2014107979 A1 WO 2014107979A1 CN 2013085524 W CN2013085524 W CN 2013085524W WO 2014107979 A1 WO2014107979 A1 WO 2014107979A1
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WO
WIPO (PCT)
Prior art keywords
orifice
oil
hole
wide
orifice plate
Prior art date
Application number
PCT/CN2013/085524
Other languages
English (en)
French (fr)
Inventor
肖亨琳
张传斌
Original Assignee
无锡开普机械有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2013100090840A external-priority patent/CN103047062A/zh
Priority claimed from CN 201320013346 external-priority patent/CN203098110U/zh
Application filed by 无锡开普机械有限公司 filed Critical 无锡开普机械有限公司
Publication of WO2014107979A1 publication Critical patent/WO2014107979A1/zh

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027Electrically actuated valves draining the chamber to release the closing pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/008Arrangement of fuel passages inside of injectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168Assembling; Disassembling; Manufacturing; Adjusting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/007Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
    • F02M63/0071Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059 characterised by guiding or centering means in valves including the absence of any guiding means, e.g. "flying arrangements"

Definitions

  • the invention relates to an electronically controlled fuel injector of a diesel engine, in particular to an electronically controlled injector which is sprayed wide.
  • the electronically controlled injector In the high-pressure common rail system, the electronically controlled injector is the most critical and complex component. It is based on the signal from the ECU. It controls the needle wide body by the electromagnetic wide opening and closing, and the high-pressure fuel in the common rail. Spray into the combustion chamber of the engine.
  • the structure of various electronically controlled injectors is similar, but the shape difference is large, which consists of electromagnetic wide, control orifice, control piston and fuel injection nozzle.
  • the seal between the guide cymbal and the orifice plate is important, especially the sealing of the orifice in the core and the orifice plate, if a sealing ball and a cone seal are used.
  • the throttling cone is difficult to machine and difficult to machine.
  • An object of the present invention is to overcome the deficiencies in the prior art and to provide an injection-controlled electronically controlled injector which can reduce the difficulty of processing, improve the sealing performance and productivity.
  • the electronically controlled injector of the injection port has an injector oil hole in the injector body, and an oil inlet port on the injector body oil hole and the injector body.
  • a lining ring and a guiding stern are arranged in the injector body, and the guiding squat is located below the lining ring, and a guiding squat oil hole and an armature guiding hole are formed on the guiding sill, and the guiding sill is disposed below the guiding sill
  • the hole diameter of the oil inlet orifice is smaller than the diameter of the oil inlet hole of the orifice plate, the diameter of the oil inlet orifice is smaller than the diameter of the oil hole, and the oil inlet hole of the orifice plate is connected with the oil inlet orifice, and the oil inlet section
  • the flow hole is connected with the connecting oil hole, the connecting oil hole is connected with the control room, the control room is connected with the oil hole of the throttle plate, the oil hole of the throttle plate is connected with the oil return orifice, and the hole of the oil return orifice is Less than the aperture of the oil hole under the orifice plate, a control piston sleeve is arranged below the orifice plate, and a control piston sleeve oil hole is opened on the control piston sleeve to control the oil hole of the piston sleeve and the oil inlet hole of the orifice plate Connected, the oil body hole of the injector is connected with the oil hole of the control piston sleeve
  • the upper end surface of the control piston selectively blocks the lower end portion of the oil hole of the orifice plate, and the electromagnet is fixed at the upper end of the injector body by an electromagnet tight cap, and the electromagnet has an electromagnetic spring, in the electromagnetic
  • An armature is connected to the lower end of the ⁇ spring, an armature flow channel is formed on the armature, an armature rod is welded on the armature, and the armature rod is slidably inserted into the guide hole of the armature rod of the guide sley, along the axis of the armature rod
  • An armature oil passage is opened, and an adjustment ball is fixed at a lower end portion of the armature rod, and a control flat is arranged in the guide seat below the armature rod, and a spherical recess is provided on the upper end surface of the control flat, in the injector body
  • the lower end is fixed with a nozzle tight cap, a needle body is installed in the nozzle cap,
  • An intermediate body is installed in the mouth tight cap, and an intermediate oil hole is opened in the intermediate body, the oil hole of the injector body is connected with the oil hole of the intermediate body, and the oil hole of the intermediate body is connected with the oil hole of the needle body body, and is fixed on the intermediate body.
  • a ejector Under the body a ejector is arranged in the end, the lower end of the ram is opposite to the upper end of the shank, the upper end of the ram is opposite to the lower end of the control piston, and the ejector guide block is sleeved on the outer end of the ejector at the top a pressure regulating spring is arranged on the ejector rod below the rod guiding block, and the lower end portion of the regulating spring is opposite to the lower end convex ring of the ejector rod; the lower end surface of the control flat is a plane, and the upper end surface of the orifice plate is opened and vented
  • the pressure ring groove, the outer ring groove and the guide groove, the outer ring groove is sleeved outside the pressure relief ring groove, the outer ring groove and the pressure relief ring groove communicate with each other through the guide groove, the pressure relief ring groove and the oil return throttle
  • the hole is selectively connected, and the outer ring groove is connected
  • a spring adjusting washer is disposed in the electromagnet, and an upper end portion of the electromagnetic spring is offset from the spring adjusting washer.
  • a pressure regulating gasket is sleeved on the ejector rod below the ram guide block, and the upper end portion of the pressure regulating spring is opposite to the pressure regulating gasket.
  • the upper end surface of the armature rod is 0. 04-0. 06 ⁇ .
  • the matching gap between the armature rod and the armature guiding hole of the guiding truss is
  • the invention reduces processing difficulty and improves sealing and productivity.
  • Figure 1 is a schematic view showing the overall structure of the present invention.
  • Figure 2 is a partial enlarged view of the present invention.
  • Figure 3 is a schematic view showing the structure of the guide wide seat in the present invention.
  • FIG. 4 is a schematic view showing the structure of a control piston sleeve in the present invention. detailed description
  • the injector body oil hole 11.1 and the injector body 11 are mounted on the fuel injector body 11
  • the oil inlet interface is connected, and a lining ring 5 and a guiding pedestal 6 are arranged in the injector body 11, and the guiding pedestal 6 is located below the lining ring 5.
  • the guiding pedestal 6 is provided with a guiding wide seat oil hole 6. 1 and an armature guiding hole, an orifice plate 9 is arranged below the guiding wide seat 6, and a control chamber 28, an oil inlet orifice 27, an orifice plate oil inlet hole are opened on the orifice plate 9 29.
  • the hole diameter of the oil inlet orifice 27 is smaller than the aperture of the orifice hole oil inlet hole 29, and the oil inlet orifice 27
  • the hole diameter is smaller than the hole diameter of the connecting oil hole 30, the orifice plate oil inlet hole 29 communicates with the oil inlet orifice 27, the oil inlet orifice 27 communicates with the connection oil hole 30, and the connection oil hole 30 communicates with the control chamber 28, and the control
  • the chamber 28 communicates with the orifice plate lower oil hole 25, and the orifice plate lower oil hole 25 communicates with the oil return orifice 24, and the oil return orifice 24 has a smaller diameter than the orifice plate lower oil hole 25.
  • control piston sleeve 10 Below the orifice plate 9
  • the control piston sleeve 10, the control piston sleeve 10 is provided with a control piston sleeve oil hole 26, the control piston sleeve oil hole 26 is connected with the orifice plate oil inlet hole 29, the injector body oil hole 11.1 and the control piston
  • the oil hole 26 is connected, and a control piston 34 is slidably inserted into the control piston sleeve 10.
  • the upper end surface of the control piston 34 selectively blocks the lower end portion of the orifice hole lower oil hole 25 at the upper end of the injector body 11.
  • the electromagnet 1 is fixed to the electromagnet tight cap 3, the electromagnet 1 has an electromagnetic wide spring 4, the armature 7 is connected to the lower end of the electromagnetic spring 4, and the armature runner 7 is opened on the armature 7. 7 is welded with an armature rod 21, and the armature rod 21 is slidably inserted into the guide rod guiding hole of the guiding wide seat 6, and an armature rod oil passage is opened in the armature rod 21 along the axial direction thereof.
  • the adjusting ball 20 is provided with a control flat 8 in the guiding wide seat 6 below the armature rod, the upper end surface of the control flat 8 is provided with a spherical recess 33, and the fuel nozzle tight cap 18 is fixed at the lower end of the injector body 11.
  • the needle wide body 17 is mounted in the nozzle tight cap 18, and the needle wide body oil hole is opened in the needle wide body 17.1, and the needle width is installed in the needle wide body 17, above the needle wide body 17.
  • the intermediate oil hole is connected to the intermediate oil hole 15.1, the intermediate body is connected with the intermediate oil hole 15.1.
  • the oil hole 15.1 is in communication with the needle wide body oil hole 17.1, and the positioning pin 16 is fixed on the intermediate body 15; the ejector pin 14 is disposed in the lower end of the injector body 11, and the lower end portion of the ejector pin 14 and the needle
  • the upper end portion of the wide body 17 abuts, the upper end portion of the jack 14 abuts against the lower end portion of the control piston 34, and the top rod guide block 19 is sleeved on the outer end of the top rod 14, and the jack 14 below the jack guide block 19
  • a pressure regulating spring 13 is disposed thereon, and a lower end portion of the pressure regulating spring 13 abuts against a convex ring at a lower end of the jack 14; the lower end surface of the control flat 8 is a flat surface, and is opened at an upper end surface of the orifice plate 9
  • the pressure relief ring groove 23, the outer ring groove 22 and the flow guiding groove 21, the outer ring groove 22 is slee
  • a spring adjusting spacer 2 is provided in the electromagnet 1, and the upper end portion of the electromagnetic wide spring 4 is opposed to the spring adjusting spacer 2.
  • a pressure regulating pad 12 is sleeved on the jack 14 below the jack guide block 19, and the upper end of the pressure regulating spring 13 abuts against the pressure regulating pad 12.
  • the upper end surface of the armature 7 is 0. 04-0. 06mm.
  • the matching gap between the armature rod 21 and the armature guiding hole of the guiding wide seat 6 is
  • the lower end surface of the control panel 8 i.e., the sealing plane
  • the annular sealing surface of the orifice plate 9 have a hardness of 58 to 64 HRC, a flatness of less than 0.009, and a surface roughness of RaO.
  • the high-pressure fuel enters the control chamber 28 through the oil inlet orifice 27 of the orifice plate 9 and enters the needle wide body through the intermediate oil hole 15.1. 17, wherein the pressure-receiving cross-section of the control piston 34 is larger than the compression cross-section of the needle width, and the pressure of the pressure-regulating spring 13 causes the needle width to be pressed against the needle wide body, so that the needle wide body 17 is closed.
  • the electromagnetic pole 1 When the ECU sends a signal, the electromagnetic pole 1 is energized to open, the armature 7 and the armature rod 21 move up under the suction force, so that the control flat 8 also moves upward under the pressure, and the high pressure fuel flows out through the oil return orifice 24, Then, through the pressure relief ring groove 23, the oil is returned to the wide seat oil hole 6.1, so that the pressure of the control chamber 28 is reduced, and the needle width is still subjected to the upward pressure of the high pressure fuel and is greater than the pressure of the pressure regulating spring 13, and then the needle width is wide. Open, high pressure fuel is sprayed from the orifice.

Abstract

一种柴油机喷射阀的电控喷油器,在喷油器体(11)内开设有喷油器体油孔(11.1),喷油器体油孔(11.1)与喷油器体(11)上的进油接口连通,在喷油器体(11)内设有衬环(5)与导向阀座(6),导向阀座(6)位于衬环(5)的下方,在导向阀座(6)上开设有导向阀座油孔(6.1),在导向阀座(6)的下方设有节流孔板(9),在节流孔板(9)上开设有控制室(28)、进油节流孔(27)、节流孔板进油孔(29)、连接油孔(30)、回油节流孔(24)与节流孔板下油孔(25),在节流孔板(9)的下方设有控制活塞套(10),在控制活塞套上开设有控制活塞套油孔(26);控制平阀(8)的下端面为平面,在节流孔板(9)的上端面开设有泄压环槽(23)、外环槽(22)与导流槽(21),外环槽(22)套在泄压环槽(23)的外部,泄压环槽(23)与回油节流孔(24)选择性连通。所述电控喷油器降低了加工难度,提高了密封性和生产率。

Description

喷射闽的电控喷油器
技术领域
本发明涉及一种柴油机的电控喷油器,尤其是一种喷射阔的电控喷 油器。
背景技术
由于电控高压共轨燃油喷射系统与传统机械式燃油系统相比,具有 降低发动机噪音、 降低排放、 提高经济性、 可靠性高等显著优势, 因此 在国外得到了广泛应用。 在国内, 由于排放法规的要求不断提升, 高压 共轨系统已成为必然的选择。
在高压共轨系统中, 电控喷油器是最关键和复杂的一个部件, 它是 根据 ECU发出的信号, 通过电磁阔的开启和关闭来控制针阔体, 将共轨 管中的高压燃油喷入发动机的燃烧室。 现在各种电控喷油器的结构相 识, 只是外形相差较大, 都是由电磁阔、 控制节流孔、 控制活塞和喷油 嘴组成。
在电控喷油器中, 导向闽座和节流孔板之间的密封很重要, 尤其 是闽芯与节流孔板中的节流孔的密封,如果采用密封球和锥面式的密 封, 节流锥孔的加工难度非常大, 很难加工。
发明内容
本发明的目的是克服现有技术中存在的不足,提供一种可以降低 加工难度、 提高密封性和生产率的喷射闽的电控喷油器。
按照本发明提供的技术方案, 所述喷射闽的电控喷油器, 在喷油 器体内开设有喷油器体油孔,喷油器体油孔与喷油器体上的进油接口 连通,在喷油器体内设有衬环与导向闽座,导向闽座位于衬环的下方, 在导向闽座上开设有导向闽座油孔与衔铁杆导向孔,在导向闽座的下 方设有节流孔板, 在节流孔板的上开设有控制室、进油节流孔、 节流 孔板进油孔、 连接油孔、 回油节流孔与节流孔板下油孔, 进油节流孔 的孔径小于节流孔板进油孔的孔径,进油节流孔的孔径小于连接油孔 的孔径, 节流孔板进油孔与进油节流孔连通, 进油节流孔与连接油孔 连通, 连接油孔与控制室连通, 控制室与节流孔板下油孔连通, 节流 孔板下油孔与回油节流孔连通,回油节流孔的孔径小于节流孔板下油 孔的孔径, 在节流孔板的下方设有控制活塞套, 在控制活塞套上开设 有控制活塞套油孔, 控制活塞套油孔与节流孔板进油孔连通, 喷油器 体油孔与控制活塞套油孔连通, 在控制活塞套内滑动插接有控制活 塞, 控制活塞的上端面选择性封堵节流孔板下油孔的下端部, 在喷油 器体的上端通过电磁铁紧帽固定有电磁铁, 电磁铁内具有电磁闽弹 簧, 在电磁闽弹簧的下端部连接有衔铁, 在衔铁上开设有衔铁流道, 在衔铁上焊接有衔铁杆,衔铁杆滑动插接在导向闽座的衔铁杆导向孔 内, 在衔铁杆内沿着其轴向开设有衔铁杆油道, 在衔铁杆的下端部固 定有调整球, 在衔铁杆下方的导向闽座内设有控制平闽, 控制平闽的 上端面设有球面凹陷, 在喷油器体的下端固定有喷油嘴紧帽, 在喷油 嘴紧帽内安装有针闽体, 在针闽体内开设有针闽体油孔, 在针闽体内 安装有针闽, 在针闽体上方的喷油嘴紧帽内安装有中间体, 在中间体 内开设有中间体油孔, 所述喷油器体油孔与中间体油孔连通, 中间体 油孔与针闽体油孔连通, 在中间体上固定有定位销; 在喷油器体的下 端内设有顶杆, 顶杆的下端部与针闽体的上端部相抵, 顶杆的上端部 与控制活塞的下端部相抵, 在顶杆的上端外部套接有顶杆导向块, 在 顶杆导向块下方的顶杆上设有调压弹簧,调压弹簧的下端部与顶杆下 端凸环相抵; 所述控制平闽的下端面为平面, 在节流孔板的上端面开 设有泄压环槽、 外环槽与导流槽, 外环槽套在泄压环槽的外部, 外环 槽与泄压环槽通过导流槽连通,泄压环槽与所述的回油节流孔选择性 连通, 外环槽与导向闽座油孔相接; 所述控制平闽的下端面选择性封 堵回油节流孔的回油出口端。
在电磁铁内设有弹簧调整垫片,所述电磁闽弹簧的上端部与弹簧 调整垫片相抵。
在顶杆导向块下方的顶杆上套接有调压垫片,所述调压弹簧的上 端部与调压垫片相抵。
所述衔铁杆的上端面低于衔铁的上端面为 0. 04-0. 06匪。
所述衔铁杆与导向闽座的衔铁杆导向孔的配合间隙为
0. 005-0. 007匪。
本发明降低了加工难度, 提高了密封性和生产率。
附图说明
图 1是本发明的整体结构示意图。
图 2是本发明的局部放大图。
图 3是本发明中导向阔座的结构示意图。
图 4是本发明中控制活塞套的结构示意图。 具体实施方式
下面结合具体实施例对本发明作进一歩说明。
如图所示, 该喷射阔的电控喷油器, 在喷油器体 11内开设有喷油 器体油孔 11. 1, 喷油器体油孔 11. 1与喷油器体 11上的进油接口连通, 在喷油器体 11内设有衬环 5与导向阔座 6,导向阔座 6位于衬环 5的下 方, 在导向阔座 6上开设有导向阔座油孔 6. 1与衔铁杆导向孔, 在导向 阔座 6的下方设有节流孔板 9, 在节流孔板 9的上开设有控制室 28、进 油节流孔 27、节流孔板进油孔 29、连接油孔 30、回油节流孔 24与节流 孔板下油孔 25, 进油节流孔 27的孔径小于节流孔板进油孔 29的孔径, 进油节流孔 27的孔径小于连接油孔 30的孔径, 节流孔板进油孔 29与 进油节流孔 27连通, 进油节流孔 27与连接油孔 30连通, 连接油孔 30 与控制室 28连通, 控制室 28与节流孔板下油孔 25连通, 节流孔板下 油孔 25与回油节流孔 24连通, 回油节流孔 24的孔径小于节流孔板下 油孔 25的孔径, 在节流孔板 9的下方设有控制活塞套 10, 在控制活塞 套 10上开设有控制活塞套油孔 26,控制活塞套油孔 26与节流孔板进油 孔 29连通, 喷油器体油孔 11. 1与控制活塞套油孔 26连通, 在控制活 塞套 10内滑动插接有控制活塞 34,控制活塞 34的上端面选择性封堵节 流孔板下油孔 25的下端部,在喷油器体 11的上端通过电磁铁紧帽 3固 定有电磁铁 1, 电磁铁 1内具有电磁阔弹簧 4, 在电磁阔弹簧 4的下端 部连接有衔铁 7, 在衔铁 7上开设有衔铁流道 7. 1, 在衔铁 7上焊接有 衔铁杆 21, 衔铁杆 21滑动插接在导向阔座 6的衔铁杆导向孔内, 在衔 铁杆 21内沿着其轴向开设有衔铁杆油道 21. 1, 在衔铁杆的下端部固定 有调整球 20, 在衔铁杆下方的导向阔座 6内设有控制平阔 8, 控制平阔 8的上端面设有球面凹陷 33, 在喷油器体 11的下端固定有喷油嘴紧帽 18,在喷油嘴紧帽 18内安装有针阔体 17,在针阔体 17内开设有针阔体 油孔 17. 1,在针阔体 17内安装有针阔,在针阔体 17上方的喷油嘴紧帽 18内安装有中间体 15,在中间体 15内开设有中间体油孔 15. 1,所述喷 油器体油孔 11. 1与中间体油孔 15. 1连通, 中间体油孔 15. 1与针阔体 油孔 17. 1连通, 在中间体 15上固定有定位销 16; 在喷油器体 11的下 端内设有顶杆 14, 顶杆 14的下端部与针阔体 17的上端部相抵, 顶杆 14的上端部与控制活塞 34的下端部相抵,在顶杆 14的上端外部套接有 顶杆导向块 19, 在顶杆导向块 19下方的顶杆 14上设有调压弹簧 13, 调压弹簧 13的下端部与顶杆 14下端凸环相抵;所述控制平阔 8的下端 面为平面, 在节流孔板 9的上端面开设有泄压环槽 23、 外环槽 22与导 流槽 21, 外环槽 22套在泄压环槽 23的外部, 外环槽 22与泄压环槽 23 通过导流槽 21连通,泄压环槽 23与所述的回油节流孔 24选择性连通, 外环槽 22与导向阔座油孔 6. 1相接; 所述控制平阔 8的下端面选择性 封堵回油节流孔 24的回油出口端。泄压环槽 23的内圆与回油节流孔 24 的回油出口端外圆之间的节流孔板 9上端面区域为节流孔板 9的环形密 封面。
在电磁铁 1内设有弹簧调整垫片 2, 所述电磁阔弹簧 4的上端部与 弹簧调整垫片 2相抵。
在顶杆导向块 19下方的顶杆 14上套接有调压垫片 12,所述调压弹 簧 13的上端部与调压垫片 12相抵。 所述衔铁杆 21的上端面低于衔铁 7的上端面为 0. 04-0. 06mm。 所述衔铁杆 21与导向阔座 6的衔铁杆导向孔的配合间隙为
0. 005-0. 007mm。
控制平阔 8的下端面(即密封平面)和节流孔板 9的环形密封面的 硬度为 58~64HRC, 平面度小于 0. 0009, 表面粗糙度为 RaO. 1。
高压燃油由喷油器体的喷油器体油孔 11. 1进入, 然后通过节流孔 板 9的进油节流孔 27进入控制室 28以及通过中间体油孔 15. 1进入针 阔体 17内, 而控制活塞 34的受压横截面大于针阔的受压横截面, 再加 上调压弹簧 13的压力就使针阔压紧在针阔体上,使针阔体 17处于关闭 状态; 当 ECU发出信号, 电磁阔 1通电开启, 衔铁 7与衔铁杆 21在吸 力作用下上移, 这样, 控制平阔 8在压力下也向上移动, 高压燃油就通 过回油节流孔 24流出, 再通过泄压环槽 23向导向阔座油孔 6. 1回油, 这样控制室 28的压力减小, 而针阔仍然受到高压燃油向上的压力且大 于调压弹簧 13的压力, 这时针阔开启, 高压燃油由喷孔喷出。 当 ECU 再次发出信号, 电磁阔 1断电关闭,衔铁 7与衔铁杆 21在电磁阔弹簧 4 的压力作用下下移, 将控制平阔 8再次压紧在节流孔板 9上, 回油节流 孔 24被堵住, 控制室 28的压力恢复, 控制活塞 34在压力作用下向下 移动, 顶住顶杆 14, 将针阔压紧在针阔体 17上, 针阔体 17再次关闭, 喷油结束。

Claims

权 利 要 求
1. 一种喷射阔的电控喷油器, 其特征是: 在喷油器体 (11) 内开设有 喷油器体油孔 (11.1), 喷油器体油孔(11.1) 与喷油器体 (11) 上 的进油接口连通,在喷油器体(11)内设有衬环(5)与导向阔座(6), 导向阔座 (6) 位于衬环 (5) 的下方, 在导向阔座 (6) 上开设有导 向阔座油孔 (6.1) 与衔铁杆导向孔, 在导向阔座 (6) 的下方设有 节流孔板 (9), 在节流孔板 (9) 的上开设有控制室 (28)、 进油节 流孔(27)、节流孔板进油孔(29)、连接油孔 (30)、回油节流孔 (24) 与节流孔板下油孔(25), 进油节流孔(27) 的孔径小于节流孔板进 油孔 (29) 的孔径, 进油节流孔 (27) 的孔径小于连接油孔 (30) 的孔径, 节流孔板进油孔 (29) 与进油节流孔 (27) 连通, 进油节 流孔 (27) 与连接油孔 (30) 连通, 连接油孔 (30) 与控制室 (28) 连通, 控制室 (28) 与节流孔板下油孔 (25) 连通, 节流孔板下油 孔 (25) 与回油节流孔 (24) 连通, 回油节流孔 (24) 的孔径小于 节流孔板下油孔(25) 的孔径, 在节流孔板 (9) 的下方设有控制活 塞套 (10), 在控制活塞套 (10) 上开设有控制活塞套油孔 (26), 控制活塞套油孔 (26) 与节流孔板进油孔 (29) 连通, 喷油器体油 孔 (11.1) 与控制活塞套油孔 (26) 连通, 在控制活塞套 (10) 内 滑动插接有控制活塞 (34), 控制活塞 (34) 的上端面选择性封堵节 流孔板下油孔 (25) 的下端部, 在喷油器体 (11) 的上端通过电磁 铁紧帽(3)固定有电磁铁(1), 电磁铁(1)内具有电磁阔弹簧(4), 在电磁阔弹簧 (4) 的下端部连接有衔铁 (7), 在衔铁 (7) 上开设 有衔铁流道(7.1), 在衔铁(7)上焊接有衔铁杆(21), 衔铁杆(21) 滑动插接在导向阔座 (6) 的衔铁杆导向孔内, 在衔铁杆 (21) 内沿 着其轴向开设有衔铁杆油道(21.1), 在衔铁杆的下端部固定有调整 球 (20), 在衔铁杆下方的导向阔座 (6) 内设有控制平阔 (8), 控 制平阔 (8) 的上端面设有球面凹陷 (33), 在喷油器体 (11) 的下 端固定有喷油嘴紧帽(18),在喷油嘴紧帽(18)内安装有针阔体(17), 在针阔体 (17) 内开设有针阔体油孔(17.1), 在针阔体(17) 内安 装有针阔, 在针阔体 (17) 上方的喷油嘴紧帽 (18) 内安装有中间 体 (15), 在中间体 (15) 内开设有中间体油孔 (15.1), 所述喷油 器体油孔 (11.1) 与中间体油孔 (15.1) 连通, 中间体油孔 (15.1) 与针阔体油孔(17.1)连通, 在中间体(15)上固定有定位销(16); 在喷油器体 (11) 的下端内设有顶杆 (14), 顶杆 (14) 的下端部与 针阔体(17) 的上端部相抵, 顶杆 (14) 的上端部与控制活塞 (34) 的下端部相抵, 在顶杆 (14) 的上端外部套接有顶杆导向块 (19), 在顶杆导向块 (19) 下方的顶杆 (14) 上设有调压弹簧 (13), 调压 弹簧(13) 的下端部与顶杆(14)下端凸环相抵; 所述控制平阔 (8) 的下端面为平面, 在节流孔板 (9) 的上端面开设有泄压环槽 (23)、 外环槽 (22) 与导流槽 (21), 外环槽 (22) 套在泄压环槽 (23) 的 外部, 外环槽 (22) 与泄压环槽 (23) 通过导流槽 (21) 连通, 泄 压环槽 (23) 与所述的回油节流孔 (24) 选择性连通, 外环槽 (22) 与导向阔座油孔 (6.1) 相接; 所述控制平阔 (8) 的下端面选择性 封堵回油节流孔 (24) 的回油出口端。
2. 如权利要求 1所述的喷射阔的电控喷油器,其特征是:在电磁铁(1) 内设有弹簧调整垫片 (2), 所述电磁阔弹簧(4) 的上端部与弹簧调 整垫片 (2) 相抵。
3. 如权利要求 1所述的喷射阔的电控喷油器, 其特征是: 在顶杆导向 块(19) 下方的顶杆 (14) 上套接有调压垫片 (12), 所述调压弹簧
(13) 的上端部与调压垫片 (12) 相抵。
4. 如权利要求 1所述的喷射阔的电控喷油器, 其特征是: 所述衔铁杆
(21) 的上端面低于衔铁 (7) 的上端面为 0.04-0.06腿。
5. 如权利要求 1所述的喷射阔的电控喷油器, 其特征是: 所述衔铁杆
(21)与导向阔座(6)的衔铁杆导向孔的配合间隙为 0.005-0.007mm。
PCT/CN2013/085524 2013-01-10 2013-10-18 喷射阀的电控喷油器 WO2014107979A1 (zh)

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