EP3129618A1 - Unité modulaire composée d'un piston et d'une buse de pulvérisation d'huile pour un moteur à combustion interne - Google Patents

Unité modulaire composée d'un piston et d'une buse de pulvérisation d'huile pour un moteur à combustion interne

Info

Publication number
EP3129618A1
EP3129618A1 EP15734564.6A EP15734564A EP3129618A1 EP 3129618 A1 EP3129618 A1 EP 3129618A1 EP 15734564 A EP15734564 A EP 15734564A EP 3129618 A1 EP3129618 A1 EP 3129618A1
Authority
EP
European Patent Office
Prior art keywords
piston
oil
cooling
spray nozzle
structural unit
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.)
Withdrawn
Application number
EP15734564.6A
Other languages
German (de)
English (en)
Inventor
Timo Linke
Rainer Scharp
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3129618A1 publication Critical patent/EP3129618A1/fr
Withdrawn legal-status Critical Current

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 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/10—Cooling by flow of coolant through pistons

Definitions

  • the present invention relates to a structural unit with a piston and a Anspritzdüse for cooling oil for an internal combustion engine, wherein the piston has a piston head and a piston skirt, wherein the piston head has a piston crown with a lower surface, a circumferential ring portion and in the region of the ring section a circumferential cooling channel with at least a feed opening for cooling oil, wherein the Olspritzjet nozzle is provided below the piston skirt.
  • the cooling of the piston takes place by injecting cooling oil from the piston shaft end in the direction of the at least one feed opening for cooling oil in the cooling channel.
  • the cooling oil penetrates into the cooling channel and causes there in a conventional manner a cooling of the piston, in particular in the region of the piston head.
  • DE 10 2006 056 01 1 A1 proposes providing three injection nozzles for cooling oil, two of which supply
  • the cooling oil jet for cooling the lower surface of the piston crown is spread wide, so that its cooling effect is insufficient, in particular because the path of the cooling oil jet from the connecting rod or of structures is at least partially blocked in the interior of the piston.
  • German patent application 10 2013 013 962.7 proposes to provide only an oil spray nozzle and a beam splitter in the interior of the piston, which targeted a part of the cooling oil discharged from the Olspritzteilüse on the lower surface of the piston.
  • the object of the present invention is thus to develop a generic piston so that an effective and technically easy oil cooling of both the cooling channel and the lower surface of the piston crown is achieved.
  • the solution consists in that a first nozzle for injecting a first cooling oil jet aligned with the at least one feed opening is provided, that an outer area of the lower surface of the piston head is designed as a guide surface for cooling oil, that a second nozzle for generating a second directed on the guide surface Is provided cooling oil jet, so that the second cooling oil jet meets a defined starting point, such that it is deflected starting from the starting point in the direction of the guide surface and the resulting cooling oil flows along the guide surface in the direction of the lower surface of the piston crown.
  • the inventively provided assembly with causes the amount of cooling oil of both the first and the second cooling oil jet is individually adjustable, so that there is sufficient cooling oil available for both the cooling channel and the lower surface of the piston crown. Due to this optimization of the amount of cooling oil of the two cooling oil jets, a particularly effective cooling of the piston is achieved with technically simple means.
  • the center axis of the first Olspritzdüse is aligned parallel to the central axis of the piston.
  • the center axis of the second nozzle is inclined with respect to the central axis of the piston, so that it encloses an acute angle ⁇ with the first nozzle so that it is ensured that during the process velvet piston stroke reaches the largest possible amount of cooling oil in the cooling channel or directed to the guide surface.
  • the first oil spray nozzle has a larger nozzle cross-section than the second oil spray nozzle, that is, the first cooling oil jet comprises a larger amount of cooling oil than the second cooling oil jet.
  • the cooling channel can absorb a larger amount of cooling oil than can be deflected at the defined starting point of the guide surface in the direction of the lower surface of the piston crown.
  • the distance of the defined starting point of the guide surface from the central axis of the piston is 1, 2 to 1, 6 times the outer radius of a small connecting rod eye of a connecting rod received in the interior of the piston. This ensures that the second cooling oil jet is directed safely past the small connecting rod eye during the entire piston stroke and completely impinges on the guide surface at the defined starting point.
  • the cooling oil from the second cooling oil jet is guided particularly effectively along the guide surface and the lower surface of the piston crown.
  • the lower surface encloses an angle ⁇ with the horizontal, wherein the difference angle ⁇ relative to the angles ⁇ and ⁇ is between 0 angular degree and 15 angular degree, ie. the angle ⁇ should not be more than 15 angular degrees smaller or larger than the angle ß.
  • the guide surface merges at a defined point into the lower surface, in particular continuously, in order to prevent the flow of cooling oil from being prevented by a flow obstacle.
  • the piston according to the invention preferably has a thermally decoupled piston shaft. This measure has the effect that the thermal expansion in the region of the piston skirt facing the piston head is significantly lower than in the case of a piston with a piston skirt connected to the piston head. Furthermore, this type of piston allows a piston fine contour with low crown in the piston head facing the region of the piston skirt. This causes a good leadership behavior of the piston in all temperature ranges during engine operation.
  • a preferred development of the piston according to the invention provides that the piston skirt has two piston hubs which are interconnected via two inner surfaces having treads and that the inner surface is connected exclusively to the tread on the pressure side of the piston via a connecting web with the lower surface of the piston crown.
  • Such a connection of the piston stem to the lower surface of the piston crown on the pressure side leads to a reduction of piston noise during engine operation. Since the piston stem is not connected on the counter-pressure side, it is particularly flexible during engine operation, whereby the seizure safety is improved.
  • the assembly according to the invention can be realized with all common piston types, in particular with one-piece piston, piston from at least two permanently interconnected components, box piston, piston with closed cooling channel and piston with downwardly open, closed with a closure element cooling channel. Pistons of a piston main body and a piston ring element are particularly preferred.
  • Figure 1 shows an embodiment of a piston for a structural unit according to the invention in section
  • Figure 2 is an illustration of the piston of Figure 1, rotated by 90 °;
  • Figure 3 is an illustration of an embodiment of the assembly according to the invention with a piston according to Figures 1 and 2;
  • FIG. 4 shows an enlarged partial view of the assembly according to FIG. 3 with a small connecting rod eye of a connecting rod received in the piston;
  • Figure 5 is a bottom view of the piston of Figure 1 with a representation of the flow of the cooling oil.
  • Figures 1 and 2 show an embodiment of a piston 10 for a structural unit 100 according to the invention.
  • the piston 10 may, as is well known, forged or cast as a one-piece blank, wherein the cooling channel is introduced by machining in the blank.
  • the piston 10 is composed of a piston main body 31 and a piston ring member 32, which may be cast or forged in a conventional manner and which are connected to each other via a weld 33, for example by electron beam welding or laser welding.
  • Weld 33 is arranged in the exemplary embodiment in a wall region of the combustion bowl.
  • the piston body 31 and the piston ring member 32 are made in the embodiment of a steel material. But they can also be made of a light metal material or a combination of both materials.
  • the piston 10 has a piston head 1 1 with a combustion bowl 13 having a piston head 12, a peripheral land 14 and a peripheral ring portion 15 with annular grooves for receiving piston rings (not shown).
  • a circumferential, downwardly open cooling channel 16 is provided which is closed by a closure element 17.
  • the closure element 17 is formed as integral with the piston main body 31, circumferential collar, the free End rests against the inner surface of the piston ring member 32.
  • the closure element 17 is provided with a feed opening 18 for cooling oil.
  • the piston 10 further comprises a piston head 1 1 thermally decoupled piston shaft 21 with piston bosses 22 and hub bores 23 for receiving a piston pin (not shown).
  • the piston bosses 22 are connected via hub connections 24 to the lower surface 12 a of the piston crown 12.
  • the piston hubs 22 are connected to each other via running surfaces 25a, 25b.
  • On the pressure side DS of the piston 10 the inner surface 26a of the tread 25a is connected to the lower surface 12a of the piston crown 12 via a connecting web 27.
  • the inner surface 26b of the tread 25b is not connected to the lower surface 12a of the piston crown 12.
  • the inner surface 26b is spaced from the piston head 12, so that a through opening 28 is formed in the direction of the cooling channel 16.
  • FIGs 3 to 5 show an embodiment of an assembly 100 according to the invention with a piston 10 according to Figures 1 and 2.
  • the cooling of the assembly 100 is indicated by arrows indicating the flow of the cooling oil.
  • a connecting rod 50 is additionally shown, the small connecting rod 51 received in the interior of the piston 10.
  • the piston pin is not shown for reasons of clarity.
  • an outer region of the lower surface 12a of the piston head 12 is formed as a guide surface 37.
  • the lower surface 12a of the piston head 12 at a defined point P in the exemplary embodiment steadily, merges into the guide surface 37.
  • the guide surface 37 is formed opposite the lower surface 12a with respect to the central axis M less steep.
  • the guide surface 37 includes in the embodiment with a perpendicular to the central axis M of the piston 10 extending horizontal H an angle ⁇ of 15 degrees angle to 55 degrees.
  • the lower surface 12a includes with the horizontal H an angle ß, which in the embodiment is greater than the angle ⁇ .
  • the angle ß should also deviate at most 15 degrees from the angle ⁇ .
  • the guide surface 37 and the Base surface 12a together include an angle ⁇ of a maximum of 15 degrees.
  • the guide surface 37 is arcuate.
  • a defined starting point A is formed, at which the imaginary extension of the guide surface 37 bears tangentially.
  • the guide surface 37 starts at the defined starting point A and ends at the defined point P.
  • the distance L of the defined starting point A from the central axis M of the piston 10 is 1, 2 times to 1.6 times the outer radius R of the small connecting rod 51 ,
  • the structural unit 100 has, in addition to the piston 10, two oil spray nozzles 35, 36 which are arranged below the piston shaft 21.
  • the central axis 35a of the first Olspritzdüse 35 is aligned parallel to the central axis M of the piston 10 and the supply port 18 and serves to supply the cooling channel 16 with cooling oil.
  • the center axis 36a of the second oil spray nozzle 36 is inclined with respect to the center axis M of the piston 10 and aligned with the guide surface 37, in the embodiment on the defined starting point A of the guide surface 37, so that it forms an acute angle with the first Olspritzdüse 35 ,
  • the second oil nozzle 36 thus serves to cool the guide surface 37 and the lower surface 12a of the piston head 12 with cooling oil.
  • the first oil spray nozzle 35 has a larger nozzle cross section than the second oil spray nozzle 36, that is, the first cooling oil jet K1 emitted by the first oil spray nozzle comprises a larger amount of cooling oil than the second cooling oil jet K2 emitted by the second oil spray nozzle.
  • the respective optimal amount of cooling oil ⁇ which both the cooling passage 16 on the one hand and the guide surface 37 and the lower surface 12a can.
  • the first cooling oil jet K1 emitted by the first oil injection nozzle 35 impinges on the supply opening 18 for cooling oil formed in the closure element 17 of the cooling channel 16, so that the cooling channel 16 continuously with a sufficient quantity of cooling oil is supplied.
  • the cooling oil can flow out of the cooling channel 16 again via an outlet opening 18 '(see FIG.
  • the second cooling oil jet K2 emitted by the second oil injection nozzle 36 meets the defined starting point. point A of the guide surface 37. Due to the dimensions described above, the second cooling oil jet is deflected in an optimal manner in the direction of the guide surface 37.
  • the cooling oil flow impinging on the guide surface 37 in this manner now flows along the guide surface 37 and subsequently along the lower surface 12a of the piston crown.
  • the flow of cooling oil flows along the entire lower surface 12a of the piston crown 12 until it runs on the inner surface 26a of the running surface 25a in the direction of the crankcase.

Landscapes

  • 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)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne une unité modulaire (100) comprenant un piston (10) et une buse de pulvérisation d'huile (35) pour l'huile de refroidissement d'un moteur à combustion interne. Le piston comporte une tête (11) et une tige (21), la tête (11) comportant un fond (12) pourvu d'une face inférieure (12a), une partie annulaire périphérique (15) et, dans la zone de la partie annulaire (15), un canal de refroidissement (16) périphérique comprenant au moins une ouverture d'amenée (18) pour l'huile de refroidissement, la buse de pulvérisation d'huile (35) étant disposée au-dessous de la tige de piston (21). Selon l'invention, une première buse de pulvérisation d'huile (35) est destinée à produire un premier jet d'huile de refroidissement (K1) orienté sur l'ouverture ou les ouvertures d'amenée (18). Une zone extérieure de la surface inférieure (12a) du fond (12) du piston est réalisée sous la forme d'une surface de guidage (37) pour l'huile de refroidissement. Une deuxième buse de pulvérisation d'huile (36) est destinée à produire un deuxième jet d'huile de refroidissement (K2) orienté sur la surface de guidage (37), de telle manière que le deuxième jet d'huile de refroidissement (K2) atteint un point de départ défini (A), de telle sorte qu'il est dévié du point de départ défini (A) en direction de la surface de guidage (37), et que le courant d'huile de refroidissement résultant circule le long de la surface de guidage (37) en direction de la surface inférieure (12a) du fond (12) du piston.
EP15734564.6A 2014-04-11 2015-04-09 Unité modulaire composée d'un piston et d'une buse de pulvérisation d'huile pour un moteur à combustion interne Withdrawn EP3129618A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014005364.4A DE102014005364A1 (de) 2014-04-11 2014-04-11 Baueinheit aus einem Kolben und einer Ölspritzdüse für einen Verbrennungsmotor
PCT/EP2015/000749 WO2015154877A1 (fr) 2014-04-11 2015-04-09 Unité modulaire composée d'un piston et d'une buse de pulvérisation d'huile pour un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP3129618A1 true EP3129618A1 (fr) 2017-02-15

Family

ID=53524712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15734564.6A Withdrawn EP3129618A1 (fr) 2014-04-11 2015-04-09 Unité modulaire composée d'un piston et d'une buse de pulvérisation d'huile pour un moteur à combustion interne

Country Status (4)

Country Link
US (1) US10260452B2 (fr)
EP (1) EP3129618A1 (fr)
DE (1) DE102014005364A1 (fr)
WO (1) WO2015154877A1 (fr)

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DE102014010528A1 (de) 2014-07-18 2016-02-18 Mahle International Gmbh Pleuel sowie Baueinheit aus einem Kolben und einem Pleuel
JP6439751B2 (ja) 2016-06-03 2018-12-19 トヨタ自動車株式会社 ピストン冷却装置
JP6780530B2 (ja) * 2017-02-15 2020-11-04 株式会社豊田自動織機 ピストンの冷却装置
DE102018128564A1 (de) * 2018-11-14 2020-05-14 Man Energy Solutions Se Kolben und Zylinder einer Brennkraftmaschine
DE102018220193A1 (de) 2018-11-23 2020-05-28 Mahle International Gmbh Ölzuführelement und Kolben einer Brennkraftmaschine
US10895191B2 (en) * 2019-06-07 2021-01-19 Bendix Commercial Vehicle Systems Llc Fluid compressor and method of operating a fluid compressor to reduce oil carryover by a compressor piston assembly
DE102019122877B4 (de) * 2019-08-27 2021-08-19 Man Energy Solutions Se Kolben einer Brennkraftmaschine
CN117028054A (zh) * 2023-07-25 2023-11-10 滨州渤海活塞有限公司 内腔冷却活塞
US12312992B2 (en) * 2023-10-20 2025-05-27 Toyota Jidosha Kabushiki Kaisha Control device for internal combustion engine

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Also Published As

Publication number Publication date
US20170030292A1 (en) 2017-02-02
US10260452B2 (en) 2019-04-16
DE102014005364A1 (de) 2015-10-29
WO2015154877A1 (fr) 2015-10-15

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