WO2020098179A1 - Plunger fuel injector and internal combustion engine - Google Patents

Plunger fuel injector and internal combustion engine Download PDF

Info

Publication number
WO2020098179A1
WO2020098179A1 PCT/CN2019/076980 CN2019076980W WO2020098179A1 WO 2020098179 A1 WO2020098179 A1 WO 2020098179A1 CN 2019076980 W CN2019076980 W CN 2019076980W WO 2020098179 A1 WO2020098179 A1 WO 2020098179A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
lubricating oil
hole
wall
chamber
Prior art date
Application number
PCT/CN2019/076980
Other languages
French (fr)
Chinese (zh)
Inventor
孙海东
郭永青
向桂蓉
Original Assignee
上海华羿汽车系统集成有限公司
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 CN201811351642.0 external-priority
Application filed by 上海华羿汽车系统集成有限公司 filed Critical 上海华羿汽车系统集成有限公司
Publication of WO2020098179A1 publication Critical patent/WO2020098179A1/en

Links

Images

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
    • F02M47/04Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure using fluid, other than fuel, for injection-valve actuation
    • 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
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10Other injectors with elongated valve bodies, i.e. of needle-valve type

Abstract

A plunger fuel injector, comprising: a body (1), wherein the body (1) is provided with a plunger hole, an inlet (5) of a fluid to be injected, an injection opening (6), and a lubricating oil inlet (7); a lower plunger (2) slidably fitted in the plunger hole, wherein the lower end of the lower plunger (2) is configured to open or close the injection opening (6); an injection chamber (8) formed between the lower end of the lower plunger (2) and the inner wall of the plunger hole, wherein said inlet (5) and the injection opening (6) are both configured to be in communication with the injection chamber (8); an upper plunger (3) slidably fitted in the plunger hole; a lubricating oil chamber (9) formed between the lower end of the upper plunger (3), the upper end of the lower plunger (2), and the inner wall of the plunger hole; a first one-way valve (10), wherein the lubricating oil inlet (7) is configured to be in communication with the lubricating oil chamber (9) by means of the first one-way valve (10); and a first resetting device (4) configured to provide a force to the upper plunger (3) for moving downwards. Also provided is an internal combustion engine comprising the plunger fuel injector. The plunger fuel injector and the internal combustion engine can reduce the problem of leakage while increasing injection pressure.

Description

柱塞喷油器及内燃机Plunger injector and internal combustion engine
本申请要求申请日为2018年11月14日、申请号为201811351642.0的中国专利申请的优先权,该申请的全部内容通过引用结合在本申请中。This application requires the priority of a Chinese patent application with an application date of November 14, 2018 and an application number of 201811351642.0. The entire contents of this application are incorporated by reference in this application.
技术领域Technical field
本公开涉及内燃机技术领域,例如涉及一种柱塞喷油器及内燃机。The present disclosure relates to the technical field of internal combustion engines, for example, to a plunger injector and an internal combustion engine.
背景技术Background technique
近年来,一方面,为了应对日益严苛的排放要求,柴油机的喷射压力越来越高,超高压喷射带来更好的燃油雾化效果,同时也带来了喷油器的泄露和磨损问题。另一方面,甲醇、乙醇及二甲醚等代用燃料在内燃机上也获得了一定的研究和应用,并有迅速扩大的趋势。但是,这些代用燃料以及包括汽油在内的这些低粘度流体,在使用相关技术中的喷油器进行高压喷射时,因为粘度低,泄露大,自润滑性能差,使得喷射压力的提高越来越困难,柱塞和柱塞孔的磨损比使用柴油时要厉害得多,影响喷油器的可靠性和耐久性。In recent years, on the one hand, in order to cope with the increasingly stringent emission requirements, the injection pressure of diesel engines is getting higher and higher, and ultra-high pressure injection brings better fuel atomization effect, but also brings about leakage and wear problems of injectors . On the other hand, alternative fuels such as methanol, ethanol, and dimethyl ether have also received certain research and application in internal combustion engines, and there is a trend of rapid expansion. However, these alternative fuels and these low-viscosity fluids including gasoline, when using high-pressure injection of related art fuel injectors, because of low viscosity, large leakage, and poor self-lubricating performance, the injection pressure is increasing. Difficult, the wear of the plunger and plunger hole is much more severe than when using diesel, which affects the reliability and durability of the injector.
发明内容Summary of the invention
本公开提出了一种柱塞喷油器及内燃机,可以在提高喷射压力的同时减轻泄露问题。The present disclosure proposes a plunger injector and an internal combustion engine, which can reduce the leakage problem while increasing the injection pressure.
一实施例提供的一种柱塞喷油器,包括:本体,所述本体上设置有柱塞孔、待喷射流体入口、喷射口和润滑油入口;下柱塞,滑动配合于所述柱塞孔中,所述下柱塞的下端设置为打开或者关闭所述喷射口;由所述下柱塞的下端与所述柱塞孔的内壁之间形成的喷射室,所述待喷射流体入口和所述喷射口均设置为与所述喷射室连通;上柱塞,滑动配合于所述柱塞孔中;由所述上柱塞的下端、所述下柱塞的上端和所述柱塞孔的内壁之间形成的润滑油腔;第一单向阀,所述润滑油入口设置为通过所述第一单向阀与所述润滑油腔连通;以及第一复位装置,设置为给所述上柱塞提供下行的力。An embodiment provides a plunger injector, including: a body provided with a plunger hole, a fluid inlet to be sprayed, an injection port, and a lubricating oil inlet; a lower plunger, which is slidingly fitted to the plunger In the hole, the lower end of the lower plunger is set to open or close the spray port; the spray chamber formed between the lower end of the lower plunger and the inner wall of the plunger hole, the fluid inlet to be sprayed and The injection ports are all set to communicate with the injection chamber; an upper plunger slidingly fits in the plunger hole; a lower end of the upper plunger, an upper end of the lower plunger and the plunger hole A lubricating oil cavity formed between the inner walls of the; a one-way valve, the lubricating oil inlet is arranged to communicate with the lubricating oil cavity through the first one-way valve; and a first reset device is arranged to The upper plunger provides downward force.
附图说明BRIEF DESCRIPTION
图1是一实施方式提供的柱塞喷油器的结构示意图。FIG. 1 is a schematic structural diagram of a plunger injector provided in an embodiment.
附图标记:Reference mark:
1、本体;2、下柱塞;3、上柱塞、4、第一复位装置;5、待喷射流体入口;6、喷射口;7、润滑油入口;8、喷射室、9、润滑油腔;10、第一单向阀;11、第二弹性件;12、限位凸起、13、限位面;14、回油室;15、回油出口。1. Body; 2. Lower plunger; 3. Upper plunger; 4. First reset device; 5. Fluid inlet to be sprayed; 6. Injection port; 7. Lubricant inlet; 8. Injection chamber, 9. Lubricant Cavity; 10, first check valve; 11, second elastic member; 12, limit protrusion, 13, limit surface; 14, oil return chamber; 15, oil return outlet.
具体实施方式detailed description
在本申请的描述中,需要理解的是,术语“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本申请和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请的限制。In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying the referred device Or the element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.
本具体实施方式提供了一种柱塞喷油器,该柱塞喷油器设置为向内燃机主体中喷射燃油、甲醇、乙醇及二甲醚等燃料,本具体实施中以待喷射流体为燃油为例进行介绍。This specific embodiment provides a plunger injector that is configured to inject fuel, methanol, ethanol, and dimethyl ether into the body of the internal combustion engine. In this specific implementation, the fluid to be injected is fuel Examples.
如图1所示,本具体实施方式提供的柱塞喷油器包括本体1、下柱塞2、上柱塞3和第一复位装置4,本体1上设置有柱塞孔、待喷射流体入口5、喷射口6和润滑油入口7。下柱塞2和上柱塞3均沿柱塞孔的轴向精密滑动配合于柱塞孔中,精密滑动配合是指下柱塞2和上柱塞3的外径分别等于或者略小于柱塞孔的内径,在能满足下柱塞2和上柱塞3沿柱塞孔滑动的前提下,下柱塞2和上柱塞3与柱塞孔间的间隙尽可能小。在一实施例中,下柱塞2的轴线和上柱塞3的轴线共线。下柱塞2位于上柱塞3的下方,下柱塞2的下端与柱塞孔的内壁之间形成喷射室8,待喷射流体入口5和喷射口6均与喷射室8连通,下柱塞2的下端设置为打开或者关闭喷射口6。为了便于控制,待喷射流体入口5优选为通过单向阀或者电磁阀与喷射室8连通。待喷射流体入口5处也可以不设置任何阀,而是通过待喷射流体的压力控制喷射。在一实施例中,下柱塞2的下端为呈锥形,喷射口6的内部轮廓与下柱塞2的下端的外部轮廓相匹配,下柱塞2的下端与喷射口6之间形成针阀。上柱塞3的下端、下柱塞2的上端和柱塞孔的内壁之间形成润滑油腔9,润滑油入口7通过第一单向阀10与润滑油腔9连通,润滑油腔9内的润滑油设置为在柱塞喷油器喷射时给下柱塞2提供向下运动的力。下柱塞2和上柱塞3与柱塞孔间的间隙尽可能小,可以避免润滑油和燃油间的相互泄露。第一复位装置4设置为给上柱塞3提供下行的力,其中下行即为沿柱塞孔向下运动,即第一复位装置4设 置为给上柱塞3提供向靠近下柱塞2的方向运动的力。As shown in FIG. 1, the plunger injector provided in this embodiment includes a body 1, a lower plunger 2, an upper plunger 3, and a first reset device 4. The body 1 is provided with a plunger hole and a fluid inlet to be injected 5. Injection port 6 and lubricating oil inlet 7. Both the lower plunger 2 and the upper plunger 3 are precisely slidingly fitted into the plunger hole along the axial direction of the plunger hole, and the precision sliding fit means that the outer diameters of the lower plunger 2 and the upper plunger 3 are equal to or slightly smaller than the plunger respectively The inner diameter of the hole, as long as the lower plunger 2 and the upper plunger 3 slide along the plunger hole, the gap between the lower plunger 2 and the upper plunger 3 and the plunger hole is as small as possible. In one embodiment, the axis of the lower plunger 2 and the axis of the upper plunger 3 are collinear. The lower plunger 2 is located below the upper plunger 3, a spray chamber 8 is formed between the lower end of the lower plunger 2 and the inner wall of the plunger hole, and the fluid inlet 5 and the spray port 6 to be sprayed are in communication with the spray chamber 8, the lower plunger The lower end of 2 is set to open or close the injection port 6. For easy control, the fluid inlet 5 to be sprayed is preferably communicated with the spray chamber 8 through a check valve or a solenoid valve. There may not be any valve at the inlet 5 of the fluid to be sprayed, but the injection is controlled by the pressure of the fluid to be sprayed. In an embodiment, the lower end of the lower plunger 2 is tapered, the inner contour of the injection port 6 matches the outer contour of the lower end of the lower plunger 2, and a needle is formed between the lower end of the lower plunger 2 and the injection port 6 valve. A lubricating oil chamber 9 is formed between the lower end of the upper plunger 3, the upper end of the lower plunger 2 and the inner wall of the plunger hole. The lubricating oil inlet 7 communicates with the lubricating oil chamber 9 through the first check valve 10. The lubricating oil is set to provide a downward movement force to the lower plunger 2 when the plunger injector is injecting. The gap between the lower plunger 2 and the upper plunger 3 and the plunger hole is as small as possible to avoid mutual leakage between the lubricating oil and the fuel. The first reset device 4 is configured to provide a downward force to the upper plunger 3, wherein the downward motion is to move downward along the plunger hole, that is, the first reset device 4 is configured to provide the upper plunger 3 with a force closer to the lower plunger 2 Directional force.
本实施方式提供的柱塞喷油器具有两个柱塞,且两个柱塞与柱塞孔的内壁之间限定出通过第一单向阀10与润滑油入口连通的润滑油腔9,润滑油腔9中的润滑油的压力能够随待喷射流体压力的变化而变化,以使得下柱塞2的两个端面所承受的压力大致相等,且由于下柱塞2与柱塞孔精密配合,使得下柱塞2与柱塞孔之间只有非常小的环形间隙,理论上可以保证喷射室8中的燃油和润滑油腔9中的润滑油压力平衡,不会发生渗漏和掺混现象,可以在提高燃料的喷射压力的同时避免泄露的问题;同时,柱塞在上下运动过程中,润滑油腔9的内壁上残留的润滑油可以保证对柱塞和柱塞孔内壁间进行有效润滑。The plunger injector provided in this embodiment has two plungers, and a lubricating oil chamber 9 communicating with the lubricating oil inlet through the first check valve 10 is defined between the two plungers and the inner wall of the plunger hole, lubricating The pressure of the lubricating oil in the oil chamber 9 can be changed with the change of the pressure of the fluid to be injected, so that the pressures received by the two end faces of the lower plunger 2 are approximately equal, and because the lower plunger 2 and the plunger hole are precisely matched, As a result, there is only a very small annular gap between the lower plunger 2 and the plunger hole. Theoretically, the pressure of the fuel in the injection chamber 8 and the lubricating oil in the lubricating oil chamber 9 can be balanced, and leakage and mixing will not occur. The problem of leakage can be avoided while increasing the fuel injection pressure; at the same time, the lubricating oil remaining on the inner wall of the lubricating oil chamber 9 during the up and down movement of the plunger can ensure effective lubrication between the plunger and the inner wall of the plunger hole.
本具体实施方式中,第一复位装置4为第一弹性件。在一实施例中,第一弹性件为弹簧,当第一弹性件为弹簧时,第一弹性件的轴线与上柱塞3的轴线共线。第一弹性件为弹簧时,第一弹性件第一端与上柱塞3的上端面抵接,第一弹性件第二端与柱塞孔的内壁面抵接。为了利于针阀的有效关闭和润滑油的吸取,柱塞喷油器还包括第二弹性件11,第二弹性件11设置为给下柱塞2提供下行的力,即第二弹性件11设置为给下柱塞2提供向远离上柱塞3的方向运动的力。在一实施例中,第二弹性件11为弹簧,第二弹性件11的轴线与下柱塞2的轴线共线。第二弹性件11的第一端抵接下柱塞2的上端面,第二弹性件11的第二端抵接柱塞孔的内壁。第一弹性件的预紧力大于第二弹性件11的预紧力。第一弹性件和第二弹性件11的预紧力是指第一弹性件和第二弹性件11在喷油器处于未工作状态时分别所提供的弹力。下柱塞2下行的力由第二弹性件11和润滑油腔9中的润滑油压力提供,第二弹性件11的预紧力通常较小,润滑油腔9中的润滑油压力与喷射室8中的燃油压力仍能保持基本相等。In this specific embodiment, the first reset device 4 is a first elastic member. In an embodiment, the first elastic member is a spring. When the first elastic member is a spring, the axis of the first elastic member is collinear with the axis of the upper plunger 3. When the first elastic member is a spring, the first end of the first elastic member contacts the upper end surface of the upper plunger 3, and the second end of the first elastic member contacts the inner wall surface of the plunger hole. In order to facilitate the effective closing of the needle valve and the absorption of lubricating oil, the plunger injector also includes a second elastic member 11, which is arranged to provide a downward force to the lower plunger 2, that is, the second elastic member 11 is provided The lower plunger 2 is provided with a force to move away from the upper plunger 3. In an embodiment, the second elastic member 11 is a spring, and the axis of the second elastic member 11 is collinear with the axis of the lower plunger 2. The first end of the second elastic member 11 abuts the upper end surface of the lower plunger 2, and the second end of the second elastic member 11 abuts the inner wall of the plunger hole. The preload force of the first elastic member is greater than the preload force of the second elastic member 11. The pretension of the first elastic member and the second elastic member 11 refers to the elastic forces provided by the first elastic member and the second elastic member 11 respectively when the fuel injector is in an inoperative state. The downward force of the lower plunger 2 is provided by the lubricating oil pressure in the second elastic member 11 and the lubricating oil chamber 9, the preload force of the second elastic member 11 is usually small, the lubricating oil pressure in the lubricating oil chamber 9 and the injection chamber The fuel pressure in 8 can still be kept substantially equal.
柱塞喷油器还包括限位装置,限位装置设置为限定上柱塞3下行的最低点。限位装置的结构不限,为了简化结构,本具体实施方式中限位装置包括设置在柱塞孔的内壁或上柱塞3中上的限位凸起12及设置于上柱塞3或柱塞孔的内壁上设置,且设置为与限位凸起12抵接的限位面13。本具体实施方式中,限位凸起12为设置在柱塞孔内壁上的限位挡圈,上柱塞3的下端面为限位面13;或者也可以使上柱塞3的中部或者下部形成台阶面,该台阶面作为限位面13。限位挡圈可拆卸地安装在柱塞孔内壁上的凹槽中,限位挡圈也可以与柱塞孔的内壁为一体结构。在其他实施方式中,也可以使限位凸起12设置于在上柱塞3上端面上,限位面13为设置在柱塞孔内壁上的台阶面。The plunger injector also includes a limit device, which is set to define the lowest point of the downward movement of the upper plunger 3. The structure of the limit device is not limited. In order to simplify the structure, the limit device in this specific embodiment includes a limit protrusion 12 provided on the inner wall of the plunger hole or the upper plunger 3 and a limit protrusion 12 provided on the upper plunger 3 or column The inner wall of the plug hole is provided, and is provided as a limiting surface 13 which is in contact with the limiting protrusion 12. In this specific embodiment, the limit protrusion 12 is a limit stop ring provided on the inner wall of the plunger hole, and the lower end surface of the upper plunger 3 is the limit surface 13; or the middle or lower portion of the upper plunger 3 may also be used A step surface is formed, and this step surface serves as a limit surface 13. The limit stop ring is detachably installed in the groove on the inner wall of the plunger hole, and the limit stop ring may also be integrated with the inner wall of the plunger hole. In other embodiments, the limiting protrusion 12 may be provided on the upper end surface of the upper plunger 3, and the limiting surface 13 is a stepped surface provided on the inner wall of the plunger hole.
限位装置使得上柱塞3下行至下行的最低点后不再继续下行,而下柱塞2仍继续运下行一微小距离后才到达下柱塞2的下行最低点,因而润滑油腔9的体积略微增加,压力降低,第一单向阀10打开以向润滑油腔9补充在泵油过程中泄露的润滑油。限位装置还可以有效避免上柱塞3与柱塞孔精密配合的部分与润滑油入口7连通的情况发生。The limit device makes the upper plunger 3 continue to descend after descending to the lowest point of the downward movement, and the lower plunger 2 still continues to travel a small distance before reaching the lowest point of the downward movement of the lower plunger 2, so the lubricating oil chamber 9 The volume increases slightly, the pressure decreases, and the first check valve 10 opens to replenish the lubricating oil chamber 9 with the lubricating oil that leaked during the pumping process. The limit device can also effectively avoid the situation where the part where the upper plunger 3 and the plunger hole are precisely matched communicates with the lubricating oil inlet 7.
如图1所示,上柱塞3的上端与柱塞孔的内壁之间形成回油室14,回油室14上设置有润滑油出口,从上柱塞3与柱塞孔的微小环形间隙中渗出的微量润滑油可以从润滑油出口流回到发动机润滑系统。As shown in FIG. 1, an oil return chamber 14 is formed between the upper end of the upper plunger 3 and the inner wall of the plunger hole. The oil return chamber 14 is provided with a lubricating oil outlet, and a small annular gap from the upper plunger 3 and the plunger hole The trace amount of lubricating oil that oozes out can flow from the lubricating oil outlet back to the engine lubricating system.
本具体实施方式还提供了一种内燃机,包括上述柱塞喷油器。The specific embodiment also provides an internal combustion engine, including the plunger injector.
以下结合图1,简要介绍本具体实施方式提供的柱塞喷油器的工作原理:The following briefly describes the working principle of the plunger injector provided in this specific embodiment in conjunction with FIG. 1:
当高压燃油从待喷射流体入口5进入喷射室8后,会对下柱塞2产生一个向上的推力,当压力超过喷油器起喷压力后,下柱塞2克服第二弹性件11的预紧力向上抬升,这时,针阀开启,燃油从喷射口6喷出雾化,开始预喷。同时,因为下柱塞2向上抬起,使得润滑油腔9中的润滑油压力升高,润滑油腔9中的润滑油推动上柱塞3克服第一弹性件的预紧力向上抬升,针阀开启行程进一步加大,喷油速度加快,进入主喷阶段。由于第一弹性件的预紧力比第二弹性件11的要大得多,所以润滑油腔9中的润滑油压力与喷射室8中的燃油压力仍基本相等。在下柱塞2两端压力均衡的情况下,且由于下柱塞2与柱塞孔精密配合,使得下柱塞2与柱塞孔之间只有非常小环形间隙,理论上可以保证喷射室8中的燃油和润滑油腔9中的润滑油压力平衡,不会发生润滑油和燃油渗漏和掺混现象,可以在提高燃料的喷射压力的同时避免泄露的问题;同时,下柱塞2在上下运动过程中,下柱塞2与柱塞孔内壁间的微小环形缝隙中残留的润滑油可以保证对下柱塞2和柱塞孔内壁间进行有效润滑。When the high-pressure fuel enters the injection chamber 8 from the fluid inlet 5 to be injected, it will generate an upward thrust on the lower plunger 2. When the pressure exceeds the injection pressure of the injector, the lower plunger 2 overcomes the pre-preparation of the second elastic member 11 The tight force lifts upwards. At this time, the needle valve opens and the fuel is sprayed from the injection port 6 to atomize and start pre-injection. At the same time, because the lower plunger 2 is lifted upward, the pressure of the lubricating oil in the lubricating oil chamber 9 rises, and the lubricating oil in the lubricating oil chamber 9 pushes the upper plunger 3 to overcome the pretension of the first elastic member, and the needle The valve opening stroke is further increased, the fuel injection speed is accelerated, and the main injection stage is entered. Since the preload of the first elastic member is much greater than that of the second elastic member 11, the lubricating oil pressure in the lubricating oil chamber 9 and the fuel pressure in the injection chamber 8 are still substantially equal. When the pressure at both ends of the lower plunger 2 is equalized, and because the lower plunger 2 and the plunger hole are precisely matched, there is only a very small annular gap between the lower plunger 2 and the plunger hole, which can theoretically be guaranteed in the spray chamber 8 The pressure of the lubricating oil in the fuel and lubricating oil chamber 9 is balanced, leakage and mixing of lubricating oil and fuel will not occur, and the problem of leakage can be avoided while increasing the fuel injection pressure; at the same time, the lower plunger 2 is up and down During the movement, the lubricating oil remaining in the tiny annular gap between the lower plunger 2 and the inner wall of the plunger hole can ensure effective lubrication between the lower plunger 2 and the inner wall of the plunger hole.
喷油结束时,喷射室8燃油压力急剧降低,第一弹性件推动上柱塞3下行,润滑油腔9中的润滑油压力和第二弹性件11的弹力共同推动下柱塞2下行,在下柱塞2到达最低点使得针阀关闭之前,限位挡圈抵接并阻止上柱塞3继续向下运动,这时,因为下柱塞2在第二弹性件11的弹力作用下继续向下运行一个微小行程以关闭针阀,润滑油腔9的容积增大,润滑油压力降低,发动机润滑系统产生的低压润滑油可以从润滑油入口7推开第一单向阀10进入润滑油腔9,补充喷油期间因为微量渗漏损失的少量润滑油。从上柱塞3与柱塞孔内壁的微小环形间隙中渗出的微量润滑油可以从润滑油出口流回到发动机润滑系统。At the end of the injection, the fuel pressure in the injection chamber 8 drops sharply. The first elastic member pushes the upper plunger 3 downward. The lubricating oil pressure in the lubricating oil chamber 9 and the elastic force of the second elastic member 11 jointly push the lower plunger 2 downward. Before the plunger 2 reaches the lowest point so that the needle valve closes, the limit stop ring abuts and prevents the upper plunger 3 from continuing to move downward, at this time, because the lower plunger 2 continues to move downward under the elastic force of the second elastic member 11 Run a small stroke to close the needle valve, the volume of the lubricating oil chamber 9 increases, the lubricating oil pressure decreases, and the low-pressure lubricating oil generated by the engine lubrication system can push the first check valve 10 from the lubricating oil inlet 7 into the lubricating oil chamber 9 , To replenish a small amount of lubricating oil lost due to trace leakage during fuel injection. A small amount of lubricating oil oozing from the tiny annular gap between the upper plunger 3 and the inner wall of the plunger hole can flow back to the engine lubrication system from the lubricating oil outlet.

Claims (10)

  1. 一种柱塞喷油器,包括:A plunger injector includes:
    本体(1),所述本体(1)上设置有柱塞孔、待喷射流体入口(5)、喷射口(6)和润滑油入口(7);A body (1), the body (1) is provided with a plunger hole, a fluid inlet (5) to be injected, an injection port (6), and a lubricating oil inlet (7);
    下柱塞(2),滑动配合于所述柱塞孔中,所述下柱塞(2)的下端设置为打开或者关闭所述喷射口(6);A lower plunger (2) slidingly fitted in the plunger hole, the lower end of the lower plunger (2) is set to open or close the injection port (6);
    由所述下柱塞(2)的下端与所述柱塞孔的内壁之间形成的喷射室(8),所述待喷射流体入口(5)和所述喷射口(6)均设置为与所述喷射室(8)连通;A spray chamber (8) formed between the lower end of the lower plunger (2) and the inner wall of the plunger hole, the fluid inlet (5) to be sprayed and the spray port (6) are both provided as The spray chamber (8) is in communication;
    上柱塞(3),滑动配合于所述柱塞孔中;The upper plunger (3) slidingly fits in the plunger hole;
    由所述上柱塞(3)的下端、所述下柱塞(2)的上端和所述柱塞孔的内壁之间形成的润滑油腔(9);A lubricating oil chamber (9) formed between the lower end of the upper plunger (3), the upper end of the lower plunger (2) and the inner wall of the plunger hole;
    第一单向阀(10),所述润滑油入口(7)设置为通过所述第一单向阀(10)与所述润滑油腔(9)连通;以及A first check valve (10), the lubricating oil inlet (7) is provided to communicate with the lubricating oil chamber (9) through the first check valve (10); and
    第一复位装置(4),设置为给所述上柱塞(3)提供下行的力。The first reset device (4) is configured to provide a downward force to the upper plunger (3).
  2. 根据权利要求1所述的柱塞喷油器,还包括限位装置,所述限位装置设置为限定所述上柱塞(3)下行的最低点。The plunger injector according to claim 1, further comprising a limiter device, the limiter device being arranged to define a lowest point of the downward movement of the upper plunger (3).
  3. 根据权利要求2所述的柱塞喷油器,其中,所述限位装置包括设置于所述柱塞孔的内壁或所述上柱塞(3)上的限位凸起(12),及设置于所述上柱塞(3)或所述柱塞孔的内壁,且设置为与所述限位凸起(12)抵接的限位面(13)。The plunger injector according to claim 2, wherein the limiting device includes a limiting protrusion (12) provided on the inner wall of the plunger hole or the upper plunger (3), and It is arranged on the inner wall of the upper plunger (3) or the plunger hole, and is arranged as a limiting surface (13) which is in contact with the limiting protrusion (12).
  4. 根据权利要求3所述的柱塞喷油器,其中,The plunger injector according to claim 3, wherein
    所述限位凸起(12)为设置在所述柱塞孔内壁上的限位挡圈,所述限位面(13)为所述上柱塞(3)的下端面或者所述限位面(13)为设置于所述上柱塞(3)的中部或下部的台阶面。The limit protrusion (12) is a limit stop ring provided on the inner wall of the plunger hole, and the limit surface (13) is the lower end surface of the upper plunger (3) or the limit position The surface (13) is a stepped surface provided in the middle or lower part of the upper plunger (3).
  5. 根据权利要求1至4任一项所述的柱塞喷油器,其中,所述第一复位装置(4)为位于所述上柱塞(3)的顶端和所述柱塞孔的内壁之间的第一弹性件。The plunger injector according to any one of claims 1 to 4, wherein the first resetting device (4) is located between the top end of the upper plunger (3) and the inner wall of the plunger hole The first elastic piece.
  6. 根据权利要求5所述的柱塞喷油器,还包括第二弹性件(11),所述第二弹性件(11)设置为给所述下柱塞(2)提供下行的力。The plunger injector according to claim 5, further comprising a second elastic member (11) arranged to provide a downward force to the lower plunger (2).
  7. 根据权利要求6所述的柱塞喷油器,其中,所述第一弹性件的预紧力大于所述第二弹性件(11)的预紧力。The plunger injector according to claim 6, wherein the preload force of the first elastic member is greater than the preload force of the second elastic member (11).
  8. 根据权利要求1至4任一项所述的柱塞喷油器,还包括由所述上柱塞(3)的上端与所述柱塞孔的内壁之间形成的回油室(14),所述回油室(14)上设置有润滑油出口。The plunger injector according to any one of claims 1 to 4, further comprising an oil return chamber (14) formed between the upper end of the upper plunger (3) and the inner wall of the plunger hole, A lubricating oil outlet is provided on the oil return chamber (14).
  9. 根据权利要求1至4任一项所述的柱塞喷油器,还包括电磁阀或者第二单向阀,所述待喷射流体入口(5)通过所述电磁阀或者所述第二单向阀与所述喷射室(8)连通。The plunger injector according to any one of claims 1 to 4, further comprising a solenoid valve or a second one-way valve, and the fluid inlet (5) to be injected passes through the solenoid valve or the second one-way valve The valve communicates with the injection chamber (8).
  10. 一种内燃机,包括根据权利要求1至9任一项所述的柱塞喷油器。An internal combustion engine including a plunger injector according to any one of claims 1 to 9.
PCT/CN2019/076980 2018-11-14 2019-03-05 Plunger fuel injector and internal combustion engine WO2020098179A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811351642.0 2018-11-14
CN201811351642.0A CN109209710A (en) 2018-11-14 2018-11-14 A kind of plunger fuel injector and internal combustion engine

Publications (1)

Publication Number Publication Date
WO2020098179A1 true WO2020098179A1 (en) 2020-05-22

Family

ID=64995588

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/076980 WO2020098179A1 (en) 2018-11-14 2019-03-05 Plunger fuel injector and internal combustion engine

Country Status (2)

Country Link
CN (1) CN109209710A (en)
WO (1) WO2020098179A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109209710A (en) * 2018-11-14 2019-01-15 上海华羿汽车系统集成有限公司 A kind of plunger fuel injector and internal combustion engine

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012145A1 (en) * 1995-09-12 1997-04-03 Diesel Technology Company Fuel injection pump having a solenoid operated control valve
CN101871391A (en) * 2010-05-31 2010-10-27 北京航空航天大学 Lubrication and cleaning method of oil coke slurry pump and ejector for compression-ignition internal combustion engine, and device thereof
CN103443440A (en) * 2011-01-31 2013-12-11 大陆汽车有限公司 Pump unit for a high-pressure pump
CN104251203A (en) * 2013-06-26 2014-12-31 现代自动车株式会社 Lubrication apparatus of high pressure pump for common rail system
CN105587452A (en) * 2016-02-05 2016-05-18 成都威特电喷有限责任公司 Electric unit pump with two-channel low-pressure oil internal circulation oil path
CN108533430A (en) * 2018-05-07 2018-09-14 梁跃中 A kind of diesel engine super-pressure vehicle fuel pump structure
CN109209710A (en) * 2018-11-14 2019-01-15 上海华羿汽车系统集成有限公司 A kind of plunger fuel injector and internal combustion engine
CN209067392U (en) * 2018-11-14 2019-07-05 上海华羿汽车系统集成有限公司 A kind of plunger fuel injector and internal combustion engine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012145A1 (en) * 1995-09-12 1997-04-03 Diesel Technology Company Fuel injection pump having a solenoid operated control valve
CN101871391A (en) * 2010-05-31 2010-10-27 北京航空航天大学 Lubrication and cleaning method of oil coke slurry pump and ejector for compression-ignition internal combustion engine, and device thereof
CN103443440A (en) * 2011-01-31 2013-12-11 大陆汽车有限公司 Pump unit for a high-pressure pump
CN104251203A (en) * 2013-06-26 2014-12-31 现代自动车株式会社 Lubrication apparatus of high pressure pump for common rail system
CN105587452A (en) * 2016-02-05 2016-05-18 成都威特电喷有限责任公司 Electric unit pump with two-channel low-pressure oil internal circulation oil path
CN108533430A (en) * 2018-05-07 2018-09-14 梁跃中 A kind of diesel engine super-pressure vehicle fuel pump structure
CN109209710A (en) * 2018-11-14 2019-01-15 上海华羿汽车系统集成有限公司 A kind of plunger fuel injector and internal combustion engine
CN209067392U (en) * 2018-11-14 2019-07-05 上海华羿汽车系统集成有限公司 A kind of plunger fuel injector and internal combustion engine

Also Published As

Publication number Publication date
CN109209710A (en) 2019-01-15

Similar Documents

Publication Publication Date Title
US2871796A (en) Pilot injection pump
EP0890736B1 (en) Injector
JP4825842B2 (en) Fuel pump
WO2020098179A1 (en) Plunger fuel injector and internal combustion engine
WO2020098180A1 (en) Plunger device and internal combustion engine
US20190078542A1 (en) Device for metering fuel
GB1453111A (en) Fuel injector for an internal combsution engine
US5979415A (en) Fuel injection pump with a hydraulically-spill valve
CN105673282A (en) Pressure-balanced valve type common-rail fuel injector
US20090184183A1 (en) Fuel injection device for an internal combustion engine
US6634569B2 (en) Pressure-controlled injector for injecting fuel
CN103644061A (en) Self-relieving non-return-oil oil atomizer and refitting method of same
US20120012681A1 (en) Fuel injector having balanced and guided plunger
CN111226033A (en) Injector for metering liquid and gaseous fuels
GB2367330A (en) Common-rail fuel injector
CN209067392U (en) A kind of plunger fuel injector and internal combustion engine
US3446440A (en) Double injection system with one nozzle
CN205592051U (en) Fuel injector
CN205605345U (en) Pressure balance valve formula common rail injector
US2287702A (en) Fuel injection device
EP2420667A1 (en) Fuel injector with damper volume and method for controlling pressure overshoot
JP2017101621A (en) Relief valve device and high-pressure pump using the same
CN110925123A (en) Device for metering gaseous and liquid fuels and method for operating the device
CN205955884U (en) Diesel oil is rail system sprayer altogether
CN109372658A (en) A kind of gas injector and its working method of gas engine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19883531

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19883531

Country of ref document: EP

Kind code of ref document: A1