EP0785344A1 - Aufsteckbare Kühlungsöldüse - Google Patents

Aufsteckbare Kühlungsöldüse Download PDF

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Publication number
EP0785344A1
EP0785344A1 EP97420004A EP97420004A EP0785344A1 EP 0785344 A1 EP0785344 A1 EP 0785344A1 EP 97420004 A EP97420004 A EP 97420004A EP 97420004 A EP97420004 A EP 97420004A EP 0785344 A1 EP0785344 A1 EP 0785344A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
nozzle
cooling
piston
nozzle body
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.)
Granted
Application number
EP97420004A
Other languages
English (en)
French (fr)
Other versions
EP0785344B1 (de
Inventor
Yves Bontaz
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.)
Bontaz Centre SA
Original Assignee
Bontaz Centre SA
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 Bontaz Centre SA filed Critical Bontaz Centre SA
Publication of EP0785344A1 publication Critical patent/EP0785344A1/de
Application granted granted Critical
Publication of EP0785344B1 publication Critical patent/EP0785344B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the piston cooling nozzles for an internal combustion engine are used to spray a cooling fluid such as oil against the piston bottom, that is to say against the piston face external to the explosion chamber. , or in a piston gallery.
  • the piston cooling nozzles usually used are attachments, fixed to the crankcase and communicating with a coolant supply orifice.
  • the position of the nozzle must be precisely determined, to precisely determine the impact of the jet of coolant on the piston bottom or in the piston gallery.
  • a known technique consists in providing a one-piece nozzle body, limited by a bearing face and by an opposite fixing face, provided with an axial bore intended to be crossed by a screw for the fluid supply and fixing valve.
  • the axial hole communicates with a transverse hole connected to a coolant outlet injection pipe.
  • the valve screw is shaped and adapted to hold the nozzle body in abutment by its bearing face against the peripheral zone of a fluid supply orifice formed in the wall of the crankcase, and to transmit the coolant. at the entrance of the transverse hole.
  • the screw valve is screwed into a threaded end portion of a cooling pipe opening out through the fluid supply orifice.
  • Centering and rotation locking means make it possible to position the nozzle body in the engine cylinder.
  • these centering and locking means comprise a ball engaged in corresponding housings of the casing and of the nozzle body.
  • Such a one-piece cooling nozzle body is metallic, and can be produced by machining a metal block, or by molding followed by repeat machining. In all cases, it is a complex form of part, leading to a high production cost.
  • the clearance required between the valve screw and the tapped bore of the crankcase which receives it introduces uncertainty into the final position of the nozzle and into the position of the impact of the coolant jet on the bottom of piston.
  • the means of centering and locking in rotation significantly increase the volume and manufacturing cost of the nozzle.
  • Also known from document DE-A-34 16 076 is a piston cooling nozzle in which the nozzle body is held by a fixing plate fixed by screws passing through two holes in the plate.
  • the fixing plate has a central projection penetrating inside the nozzle body. This method of attachment is very different from a screw-valve, and requires additional machining in the crankcase wall.
  • the problem proposed by the present invention is to design a new structure of a screw-valve sprinkler for piston cooling which can be produced in a much less expensive way than the known structures, while fulfilling all of the centering and blocking functions. in rotation for precise positioning of the nozzle in the engine cylinder, and while increasing the orientation accuracy and the reproducibility of the jet of cooling fluid projected on the piston bottom.
  • the piston cooling nozzle body has a complex shape intended to perform multiple functions: certain shaped parts are intended to fulfill the functions of centering and blocking the rotation of the nozzle body in the engine cylinder; other shaped parts are intended to fulfill the function of conduction of the coolant and the seal function between the nozzle body and the crankcase wall, as well as the function of formation and direction of the jet of coolant cooling.
  • the idea is to provide the functions of centering and blocking in rotation by the nozzle parts ensuring the functions of fluid conduction and sealing.
  • a piston cooling nozzle for an internal combustion engine comprises a nozzle body pierced with an axial channel communicating with a transverse bore connected to a cooling fluid outlet injection duct, the nozzle body being shaped to be fixed to the cylinder wall and to seal the axial channel with a fluid supply orifice for the introduction of the fluid cooling in the nozzle, with means for centering and locking in rotation for positioning the nozzle body in a cylinder of the engine;
  • the nozzle body comprises a cylindrical sleeve of revolution, coaxial with the axial channel, the outside diameter of the sleeve being adapted for its force introduction into the fluid supply orifice itself cylindrical of revolution;
  • the coolant outlet injection pipe comprises two opposite lateral reference faces, shaped to constitute reference faces capable of cooperating with positioning stops both when bending the pipe and when positioning the nozzle in the engine .
  • the external surface of the sleeve comprises a knurled portion with straight knurling, or with cross knurling.
  • a piston cooling nozzle 1 is an attached piece on the cylinder crankcase wall 2, inside the engine, shaped to take coolant circulating in a pipe of cooling 3 and to project the cooling fluid into the engine cylinder against the bottom 4 of the piston 5, that is to say against the face of the piston which is external to the explosion chamber 6.
  • the nozzle 1 comprises a nozzle body 7 pierced with an axial channel 8 communicating with a transverse bore 9 connected to a coolant outlet injection pipe 10.
  • the coolant outlet injection pipe 10 is a curved tube, one end 11 of which is fitted in the transverse bore 9 of the nozzle body 7, and the other end of which is directed towards the piston 5.
  • the piston 5 is shown in its extreme lower operating position, and the cooling fluid jet is illustrated by the dashed line 13. It is understood the advantage of good orientation accuracy and concentration of the jet 13 of coolant, to strike the piston 5 in a suitable zone favoring the distribution of the coolant on the bottom 4 of the piston, whatever the position of the piston 5 along its stroke.
  • FIGS. 1 to 3 illustrate on a larger scale the nozzle 1 of FIG. 4.
  • the correct positioning of the nozzle 1 and of the jet 13 is ensured by using as a reference the conduit itself of injection outlet cooling fluid 10.
  • the cooling fluid outlet injection duct 10 comprises two opposite lateral reference faces 18 and 19, visible in FIG. 3, constituted by the lateral faces of a straight portion 28 of the duct 10 to be suitably shaped to constitute reference faces.
  • These reference lateral faces 18, 19 can cooperate with positioning stops 20 and 21 of a fitting tool, with both during the bending of the conduit 10 during its manufacture and during the positioning of the nozzle 1 in the engine.
  • the positioning stops 20 and 21 come to bear at the outlet of the conduit 10 against the reference lateral faces 18 and 19, leaving a small minimum clearance. It is thus possible to achieve better reproducibility in positioning the impact of the jet 13.
  • the nozzle body 7 comprises a cylindrical sleeve 14 of revolution, coaxial with the axial channel 8.
  • the outside diameter of the sleeve 14 is suitable for its introduction by force in the fluid supply orifice 15 of the cylinder casing 2.
  • the fluid supply orifice 15 is itself cylindrical of revolution.
  • the outer surface of the sleeve 14 comprises a knurled portion 16, which can advantageously be an intermediate portion along the length L of the sleeve 14.
  • the knurled portion 16 when used, may include straight knurling. Alternatively, the knurled portion 16 may include cross knurling, as illustrated in FIG. 2.
  • the external surface of the sleeve 14 may include a cylindrical portion 16 that is smooth with tolerances allowing a tight fit. For example, good results are obtained with a hole of diameter 9 +0.09 -0 mm and a sleeve 14 of diameter 9.11 -0.04 -0 mm.
  • the portion 16 of the outer surface of the sleeve 14 may include a protrusion made by longitudinal or circular deformation.
  • annular groove 22 which limits the length of the portion 16 of the external surface of the sleeve engaged with the wall of the orifice d fluid supply 15.
  • the nozzle body 7 is devoid of any other means ensuring the attachment of the nozzle in the cylinder casing 2, and ensuring its blocking in rotation about its axis.
  • These two fixing and rotation blocking functions are provided by the sleeve 14 forcibly engaged in the fluid supply orifice 15 of the cylinder casing 2.
  • the adaptation of the sleeve 14 in the fluid supply orifice 15, and its guidance by the positioning stops 20 and 21, make it possible to improve the positioning accuracy of the nozzle, by the fact that no play is left between the sleeve 14 and the fluid supply orifice 15, and by the fact that the guidance is the same during the two operations of final forming of the conduit 10 and insertion of the nozzle 1 into the engine.
  • the end of the sleeve 14 has a conical chamfer 17, adapted to facilitate penetration into the fluid supply orifice 15, limiting the risks of degradation of the wall of the fluid supply orifice 15 and facilitating the assembly.
  • the presence of the force-fitted part 16 ensures high mechanical rigidity of the nozzle assembly in the cylinder casing 2, while ensuring sufficient sealing to prevent the exit of coolant between the sleeve 14 and the orifice fluid supply 15.
  • An internal combustion engine can thus advantageously comprise cooling nozzles 1 according to the invention, as described above, fixed in the piston chamber or chambers and adapted to each project the cooling fluid in a concentrated jet on the bottom 4 d '' a piston 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Air Bags (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Surgical Instruments (AREA)
  • Insulators (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Nozzles (AREA)
EP97420004A 1996-01-18 1997-01-08 Aufsteckbare Kühlungsöldüse Expired - Lifetime EP0785344B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9600698A FR2743847B1 (fr) 1996-01-18 1996-01-18 Gicleur de refroidissement a emmanchement
FR9600698 1996-01-18

Publications (2)

Publication Number Publication Date
EP0785344A1 true EP0785344A1 (de) 1997-07-23
EP0785344B1 EP0785344B1 (de) 2002-09-04

Family

ID=9488345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97420004A Expired - Lifetime EP0785344B1 (de) 1996-01-18 1997-01-08 Aufsteckbare Kühlungsöldüse

Country Status (7)

Country Link
EP (1) EP0785344B1 (de)
AT (1) ATE223557T1 (de)
DE (2) DE785344T1 (de)
ES (1) ES2183109T3 (de)
FR (1) FR2743847B1 (de)
HK (1) HK1001410A1 (de)
PT (1) PT785344E (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1591640A1 (de) * 2004-04-29 2005-11-02 de Pretto, Alain Kühlungsdüse für die Heissstelle eines Kolbens einer Kraftfahrzeugbrennkraftmaschine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004049174B4 (de) * 2004-10-08 2014-11-13 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Spritzdüse zur Kühlung eines Kolbens einer Brennkraftmaschine
DE102005006439B4 (de) * 2005-02-12 2014-06-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Spritzdüse zur Kühlung eines Kolbens einer Brennkraftmaschine
DE102011077506A1 (de) * 2011-06-14 2012-12-20 Bayerische Motoren Werke Aktiengesellschaft Schraubverbindung für eine Ölspritzdüse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991769A (en) 1959-04-27 1961-07-11 Gen Motors Corp Piston and piston cooling means
FR2259981A1 (de) 1974-02-06 1975-08-29 Perkins Engines Ltd
DE2532132A1 (de) * 1975-07-18 1977-02-03 Kloeckner Humboldt Deutz Ag Kuehloelversorgung der kolben von hubkolben-brennkraftmaschinen
DE3416076A1 (de) 1983-06-22 1985-01-10 Tatra N.P., Kopřivnice Spritzduese zum bespritzen eines kolbens mit oel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991769A (en) 1959-04-27 1961-07-11 Gen Motors Corp Piston and piston cooling means
FR2259981A1 (de) 1974-02-06 1975-08-29 Perkins Engines Ltd
DE2532132A1 (de) * 1975-07-18 1977-02-03 Kloeckner Humboldt Deutz Ag Kuehloelversorgung der kolben von hubkolben-brennkraftmaschinen
DE3416076A1 (de) 1983-06-22 1985-01-10 Tatra N.P., Kopřivnice Spritzduese zum bespritzen eines kolbens mit oel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1591640A1 (de) * 2004-04-29 2005-11-02 de Pretto, Alain Kühlungsdüse für die Heissstelle eines Kolbens einer Kraftfahrzeugbrennkraftmaschine
FR2869641A1 (fr) * 2004-04-29 2005-11-04 Pretto Alain De Gicleur de refroidissement d'un point chaud d'un piston de moteur de vehicule automobile ou analogue

Also Published As

Publication number Publication date
FR2743847B1 (fr) 1998-02-27
HK1001410A1 (en) 1998-06-19
DE69715055D1 (de) 2002-10-10
DE69715055T2 (de) 2003-04-30
EP0785344B1 (de) 2002-09-04
DE785344T1 (de) 1998-01-29
PT785344E (pt) 2003-01-31
FR2743847A1 (fr) 1997-07-25
ATE223557T1 (de) 2002-09-15
ES2183109T3 (es) 2003-03-16

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