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WO2020098179A1 - Injecteur de carburant à piston et moteur à combustion interne - Google Patents

Injecteur de carburant à piston et moteur à combustion interne Download PDF

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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
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2019/076980
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English (en)
Chinese (zh)
Inventor
孙海东
郭永青
向桂蓉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Olahmotors Co Ltd
Original Assignee
Shanghai Olahmotors Co Ltd
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
Application filed by Shanghai Olahmotors Co Ltd filed Critical Shanghai Olahmotors Co Ltd
Publication of WO2020098179A1 publication Critical patent/WO2020098179A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/04—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure using fluid, other than fuel, for injection-valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type

Definitions

  • the present disclosure relates to the technical field of internal combustion engines, for example, to a plunger injector and an internal combustion engine.
  • the present disclosure proposes a plunger injector and an internal combustion engine, which can reduce the leakage problem while increasing the injection pressure.
  • 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.
  • FIG. 1 is a schematic structural diagram of a plunger injector provided in an embodiment.
  • 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.
  • the fluid to be injected is fuel Examples.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first reset device 4 is a first elastic member.
  • the first elastic member is a spring.
  • the axis of the first elastic member is collinear with the axis of the upper plunger 3.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the specific embodiment also provides an internal combustion engine, including the plunger injector.
  • 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de carburant à piston, lequel injecteur comprend : un corps (1), le corps (1) comportant un trou de piston, une entrée (5) d'un fluide devant être injecté, une ouverture d'injection (6), et une entrée d'huile de lubrification (7) ; un piston inférieur (2) monté de manière coulissante dans le trou de piston, l'extrémité inférieure du piston inférieur (2) étant configurée pour ouvrir ou fermer l'ouverture d'injection (6) ; une chambre d'injection (8) formée entre l'extrémité inférieure du piston inférieur (2) et la paroi interne du trou de piston, ladite entrée (5) et l'ouverture d'injection (6) étant toutes deux configurées pour être en communication avec la chambre d'injection (8) ; un piston supérieur (3) monté de manière coulissante dans le trou de piston ; une chambre d'huile de lubrification (9) formée entre l'extrémité inférieure du piston supérieur (3), l'extrémité supérieure du piston inférieur (2), et la paroi interne du trou de piston ; une première valve unidirectionnelle (10), l'entrée d'huile de lubrification (7) étant configurée pour être en communication avec la chambre d'huile de lubrification (9) au moyen de la première valve unidirectionnelle (10) ; et un premier dispositif de réinitialisation (4) configuré pour délivrer une force au piston supérieur (3) pour le déplacer vers le bas. L'invention concerne également un moteur à combustion interne, lequel moteur comprend l'injecteur de carburant à piston. L'injecteur de carburant à piston et le moteur à combustion interne peuvent réduire le problème de fuites tout en augmentant la pression d'injection.
PCT/CN2019/076980 2018-11-14 2019-03-05 Injecteur de carburant à piston et moteur à combustion interne Ceased WO2020098179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811351642.0A CN109209710B (zh) 2018-11-14 2018-11-14 一种柱塞喷油器及内燃机
CN201811351642.0 2018-11-14

Publications (1)

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

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PCT/CN2019/076980 Ceased WO2020098179A1 (fr) 2018-11-14 2019-03-05 Injecteur de carburant à piston et moteur à combustion interne

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CN (1) CN109209710B (fr)
WO (1) WO2020098179A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119554166A (zh) * 2024-12-02 2025-03-04 一汽解放汽车有限公司 喷射器、发动机及车辆

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109209710B (zh) * 2018-11-14 2024-05-28 上海华羿汽车系统集成有限公司 一种柱塞喷油器及内燃机
CN109695566B (zh) * 2019-01-18 2024-12-03 王淑平 一种柱塞泵的密封润滑结构

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012145A1 (fr) * 1995-09-12 1997-04-03 Diesel Technology Company Pompe d'injection de carburant dotee d'une soupape de commande a solenoide
CN101871391A (zh) * 2010-05-31 2010-10-27 北京航空航天大学 压燃式内燃机用油焦浆泵和喷射器的润滑清洁方法及装置
CN103443440A (zh) * 2011-01-31 2013-12-11 大陆汽车有限公司 用于高压泵的泵单元
CN104251203A (zh) * 2013-06-26 2014-12-31 现代自动车株式会社 用于通用油路系统的高压泵的润滑装置
CN105587452A (zh) * 2016-02-05 2016-05-18 成都威特电喷有限责任公司 双通道低压油内循环油路电控单体泵
CN108533430A (zh) * 2018-05-07 2018-09-14 梁跃中 一种柴油机超高压燃油泵结构
CN109209710A (zh) * 2018-11-14 2019-01-15 上海华羿汽车系统集成有限公司 一种柱塞喷油器及内燃机
CN209067392U (zh) * 2018-11-14 2019-07-05 上海华羿汽车系统集成有限公司 一种柱塞喷油器及内燃机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB696993A (en) * 1950-12-05 1953-09-09 Motorpal A fuel-injection pump for internal-combustion engines
CN2528948Y (zh) * 2002-04-08 2003-01-01 江苏常发集团 单体柱塞式喷油泵及安装该喷油泵的柴油机
CN204677346U (zh) * 2015-04-30 2015-09-30 哈尔滨工程大学 常闭型机电复合式高压油泵
JP6406195B2 (ja) * 2015-09-18 2018-10-17 株式会社デンソー ポンプ
CN107956617A (zh) * 2016-10-18 2018-04-24 上海夏雪科技有限公司 内燃机的燃料喷射系统

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012145A1 (fr) * 1995-09-12 1997-04-03 Diesel Technology Company Pompe d'injection de carburant dotee d'une soupape de commande a solenoide
CN101871391A (zh) * 2010-05-31 2010-10-27 北京航空航天大学 压燃式内燃机用油焦浆泵和喷射器的润滑清洁方法及装置
CN103443440A (zh) * 2011-01-31 2013-12-11 大陆汽车有限公司 用于高压泵的泵单元
CN104251203A (zh) * 2013-06-26 2014-12-31 现代自动车株式会社 用于通用油路系统的高压泵的润滑装置
CN105587452A (zh) * 2016-02-05 2016-05-18 成都威特电喷有限责任公司 双通道低压油内循环油路电控单体泵
CN108533430A (zh) * 2018-05-07 2018-09-14 梁跃中 一种柴油机超高压燃油泵结构
CN109209710A (zh) * 2018-11-14 2019-01-15 上海华羿汽车系统集成有限公司 一种柱塞喷油器及内燃机
CN209067392U (zh) * 2018-11-14 2019-07-05 上海华羿汽车系统集成有限公司 一种柱塞喷油器及内燃机

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119554166A (zh) * 2024-12-02 2025-03-04 一汽解放汽车有限公司 喷射器、发动机及车辆
CN119554166B (zh) * 2024-12-02 2025-10-31 一汽解放汽车有限公司 喷射器、发动机及车辆

Also Published As

Publication number Publication date
CN109209710B (zh) 2024-05-28
CN109209710A (zh) 2019-01-15

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