WO2018184171A1 - Piston destiné à être utilisé dans un cylindre de moteur et moteur à piston - Google Patents

Piston destiné à être utilisé dans un cylindre de moteur et moteur à piston Download PDF

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Publication number
WO2018184171A1
WO2018184171A1 PCT/CN2017/079584 CN2017079584W WO2018184171A1 WO 2018184171 A1 WO2018184171 A1 WO 2018184171A1 CN 2017079584 W CN2017079584 W CN 2017079584W WO 2018184171 A1 WO2018184171 A1 WO 2018184171A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
engine
recess
fuel
cylinder
Prior art date
Application number
PCT/CN2017/079584
Other languages
English (en)
Chinese (zh)
Inventor
程明军
Original Assignee
上海长辛实业有限公司
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
Application filed by 上海长辛实业有限公司 filed Critical 上海长辛实业有限公司
Priority to PCT/CN2017/079584 priority Critical patent/WO2018184171A1/fr
Priority to CN201780004850.0A priority patent/CN108495991A/zh
Publication of WO2018184171A1 publication Critical patent/WO2018184171A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/26—Pistons  having combustion chamber in piston head

Definitions

  • Piston and piston engine for use in engine cylinders
  • the present invention relates to a piston engine, and more particularly to a piston for use in an engine cylinder having a recess provided at the top.
  • the compression-ignition engine is an internal combustion engine that does not rely on spark ignition, but relies on high temperature and high pressure in the cylinder at the end of compression to cause spontaneous combustion of the mixture.
  • Patent document CN101761415A discloses a recessed diesel piston and a compression ignition engine which, after the fuel is injected into the recess, is unfavorable for fuel-air mixing due to an unreasonable spatial distribution of the fuel beam and a short distance to the piston wall. The fuel is not burned enough, and the exhaust pollutants are discharged more; and it is prone to knocking. If these defects are not desired, the engine compression ratio can only be reduced accordingly, which will reduce the power and thermal efficiency of the engine.
  • the technical problem to be solved by the present invention is to provide a piston and a piston engine for use in an engine cylinder. They can improve the combustion efficiency of the fuel, suppress the occurrence of knocking, and ultimately improve the power and thermal efficiency of the engine.
  • the piston for use in an engine cylinder of the present invention provides a technical solution: a piston for use in an engine cylinder, comprising a recess formed by recessing from the top surface inward, the overall space of the recess being in the shape of a truncated cone, ie
  • the inner diameter of the recess gradually decreases from the bottom surface to the mouth portion, and the ratio of the diameter of the upper bottom of the circular table to the outer diameter of the piston is 0.25 to 0.55; the ratio of the diameter of the lower bottom of the circular table to the outer diameter of the piston is ⁇ 0.4.
  • the angle between the bottom edge of the trapezoidal section of the truncated cone and the side is ⁇ 60°.
  • the piston engine of the present invention comprises a cylinder, a piston sleeved in the cylinder wall and a fuel injector facing the piston, wherein the nozzle of the injector forms a fuel injection cone angle ⁇ 60°;
  • the piston comprises a recess formed by recessing from the top surface, the overall space of the recess being in the shape of a truncated cone, that is, the inner diameter of the recess is gradually reduced from the bottom surface to the mouth portion, and the diameter of the upper bottom of the circular table is
  • the ratio of the outer diameter of the piston is 0.25 to 0.55; the ratio of the diameter of the lower bottom of the circular table to the outer diameter of the piston is ⁇ 0.4.
  • the angle between the bottom edge of the trapezoidal section of the truncated cone and the side is ⁇ 60°.
  • the round table-shaped recess has a more reasonable spatial distribution of the fuel beam after the fuel is injected, and the distance to the piston wall is longer, which is more conducive to fuel air.
  • Figure 1 is a cross-sectional view of a piston engine of the present invention
  • Figure 2 is a partial enlarged view of Figure 1;
  • Figure 3 is a dimensional relationship diagram of a notch of the piston of the present invention.
  • Figure 4 is a schematic view showing the intake process of the engine of the present invention.
  • Figure 5 is a schematic illustration of the exhaust process of the engine of the present invention.
  • FIG. 1 to 3 which is a piston engine of the present invention, comprising a cylinder and a fuel injector 4, the combustion chamber of the cylinder is surrounded by a cylinder wall 2, a cylinder head 1 and a piston 3 sleeved in the cylinder wall.
  • the injector 4 is located in the middle of the cylinder head 1 and faces the outlet of the top recess of the piston 3.
  • the cylinder head is provided with an air inlet 11, an intake valve 111, an exhaust port 12, and an exhaust valve 121 for injection.
  • the oil jets from the device form a cone angle of 5.
  • a recess 30 is formed in the top surface of the piston 3, which is in the shape of a truncated cone.
  • the oil jet cone angle is larger and coincides with the truncated cone shape of the recess of the present invention.
  • the working principle of the piston engine of the present invention is as follows: the piston reciprocates relative to the cylinder wall, the intake valve moves up and down with respect to the intake port, and the exhaust valve moves up and down with respect to the exhaust port, and these movements coordinate with each other to form an inlet and outlet Gas process.
  • the distribution of the high temperature zone that is, the angle 6 in the process of inlet and exhaust, respectively, is to directly ignite the fuel injected at the end of the compression stroke without requiring a special ignition device. There is also no need for a larger compression ratio to compress the fuel.
  • the nozzle of the injector ejects fuel to the notch of the piston in the combustion chamber to form a fuel beam; the bottom surface of the notch having a trapezoidal shape and a truncated cone shape as a whole A high temperature zone is formed at an angle with the side surface, and the fuel beam injected from the nozzle is in contact with the air in the high temperature zone.
  • the temperature in the high temperature zone is greater than the ignition point of the fuel, the fuel is ignited and ignited, and then enters the power stroke, and the cycle is repeated. , generating power. Therefore, the present invention can directly ignite a fuel having a relatively high ignition point without requiring a special ignition device, and does not require a high compression ratio to compress the fuel while avoiding misfire of the engine.
  • the distance from the fuel jet to the inner side wall of the piston is longer, so that the space distribution of the fuel jet in the recess before combustion is more Uniform, more conducive to the combustion of fuel and air, improve combustion efficiency and reduce emissions of exhaust pollutants.
  • the outlet of the notch is small, in addition to being able to store part of the thermal energy and reduce the consumption of fuel, the instantaneous impact force on the piston is reduced at the moment when the fuel is ignited and burned, thereby reducing or reducing the occurrence of knocking.
  • the compression ratio of the engine can be appropriately increased to increase the power and thermal efficiency of the engine while prolonging the life of the engine.
  • the two-stroke engine structure is somewhat different from the four-stroke engine structure, it is a piston engine. Therefore, the piston structure is applicable to all piston engines, including two-stroke, four-stroke, rotary piston engines and the like. engine.

Abstract

La présente invention concerne un piston (3) destiné à être utilisé dans un cylindre de moteur et un moteur à piston qui est pourvu dudit piston (3), le piston (3) comprenant: un évidement (30) qui est formé d'une surface supérieure à une concavité interne, l'espace global de l'évidement (30) étant une forme de cône tronqué, le rapport du diamètre de fond supérieur du cône tronqué au diamètre externe du piston étant de 0,25 à 0,55, et le rapport du diamètre de fond inférieur du cône tronqué au diamètre externe du piston est ≥ 0,4. Le moteur n'a plus besoin d'un dispositif d'allumage spécial, tandis que le carburant est brûlé plus complètement, et l'efficacité de combustion est plus élevée; de plus, la taille d'une sortie de l'évidement (30) empêche la production de cliquetis, ce qui peut augmenter en conséquence la puissance et l'efficacité thermique du moteur.
PCT/CN2017/079584 2017-04-06 2017-04-06 Piston destiné à être utilisé dans un cylindre de moteur et moteur à piston WO2018184171A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2017/079584 WO2018184171A1 (fr) 2017-04-06 2017-04-06 Piston destiné à être utilisé dans un cylindre de moteur et moteur à piston
CN201780004850.0A CN108495991A (zh) 2017-04-06 2017-04-06 用于发动机气缸内的活塞及活塞式发动机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/079584 WO2018184171A1 (fr) 2017-04-06 2017-04-06 Piston destiné à être utilisé dans un cylindre de moteur et moteur à piston

Publications (1)

Publication Number Publication Date
WO2018184171A1 true WO2018184171A1 (fr) 2018-10-11

Family

ID=63344683

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/079584 WO2018184171A1 (fr) 2017-04-06 2017-04-06 Piston destiné à être utilisé dans un cylindre de moteur et moteur à piston

Country Status (2)

Country Link
CN (1) CN108495991A (fr)
WO (1) WO2018184171A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083330A (en) * 1976-09-23 1978-04-11 R. A. Lister & Company Limited Piston for an internal combustion engine
JPH07150944A (ja) * 1993-12-02 1995-06-13 Toyota Motor Corp 直噴式ディーゼルエンジンの燃焼室構造
JPH07189701A (ja) * 1993-12-27 1995-07-28 Hino Motors Ltd 内燃機関用ピストン
JPH1182028A (ja) * 1997-08-29 1999-03-26 Toyota Motor Corp 筒内噴射式火花点火内燃機関
EP0971107A2 (fr) * 1998-07-08 2000-01-12 Isuzu Ceramics Research Institute Co., Ltd. Moteur à combustion à préchambre et à gaz avec compresseur du carburant gazeux
CN2911212Y (zh) * 2006-06-28 2007-06-13 江苏常发实业集团有限公司 小型单缸直喷式水冷柴油机的缩口型燃烧室
CN103397951A (zh) * 2013-08-06 2013-11-20 江苏常工动力机械有限公司 一种活塞燃烧室结构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201001562D0 (en) * 2010-01-29 2010-03-17 Ricardo Uk Ltd Direct injection diesel
CN205823471U (zh) * 2016-05-19 2016-12-21 庆铃汽车（集团）有限公司 一种发动机活塞结构
CN206860305U (zh) * 2017-04-06 2018-01-09 上海长辛实业有限公司 用于发动机气缸内的活塞及活塞式发动机

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4083330A (en) * 1976-09-23 1978-04-11 R. A. Lister & Company Limited Piston for an internal combustion engine
JPH07150944A (ja) * 1993-12-02 1995-06-13 Toyota Motor Corp 直噴式ディーゼルエンジンの燃焼室構造
JPH07189701A (ja) * 1993-12-27 1995-07-28 Hino Motors Ltd 内燃機関用ピストン
JPH1182028A (ja) * 1997-08-29 1999-03-26 Toyota Motor Corp 筒内噴射式火花点火内燃機関
EP0971107A2 (fr) * 1998-07-08 2000-01-12 Isuzu Ceramics Research Institute Co., Ltd. Moteur à combustion à préchambre et à gaz avec compresseur du carburant gazeux
CN2911212Y (zh) * 2006-06-28 2007-06-13 江苏常发实业集团有限公司 小型单缸直喷式水冷柴油机的缩口型燃烧室
CN103397951A (zh) * 2013-08-06 2013-11-20 江苏常工动力机械有限公司 一种活塞燃烧室结构

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