EP0989303A1 - Schmierpumpe einer Brennkraftmaschine - Google Patents

Schmierpumpe einer Brennkraftmaschine Download PDF

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Publication number
EP0989303A1
EP0989303A1 EP99402312A EP99402312A EP0989303A1 EP 0989303 A1 EP0989303 A1 EP 0989303A1 EP 99402312 A EP99402312 A EP 99402312A EP 99402312 A EP99402312 A EP 99402312A EP 0989303 A1 EP0989303 A1 EP 0989303A1
Authority
EP
European Patent Office
Prior art keywords
pinion
pump
shaft
rotation
control shaft
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
EP99402312A
Other languages
English (en)
French (fr)
Other versions
EP0989303B1 (de
Inventor
Gabriel Plassat
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen 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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0989303A1 publication Critical patent/EP0989303A1/de
Application granted granted Critical
Publication of EP0989303B1 publication Critical patent/EP0989303B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/02—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for several machines or pumps connected in series or in parallel

Definitions

  • the invention relates to an oil pump for lubrication of an internal combustion engine.
  • the invention relates more particularly to a pump external gear oil with variable displacement.
  • the displacement of an oil pump is determined and measured under standard operating conditions of the engine.
  • the oil pump provides a oil flow proportional to engine speed.
  • the pump imposes a high oil delivery rate, which may cause cause too high a pressure in the lubrication.
  • the flow and pressure of the oil discharged by the pump are generally oversized compared to engine requirements under normal conditions so ensure good engine lubrication in extreme conditions where the engine speed is high, or when the lubricating oil is cold and therefore more viscous.
  • this oversized flow presents the disadvantage of unnecessarily increasing the power consumed by the pump.
  • Document FR 2 711 739 describes a pump for lubrication for internal combustion engine whose displacement, and therefore the power it consumes, decrease when the discharge pressure exceeds a threshold value.
  • This pump has two gears, one of which is mounted sliding in the pump body in one direction parallel to its axis of rotation. Means of recall and hydraulic actuator supplied with oil discharged by the pump exert an antagonistic action on the movable pinion so to vary the mesh length of the two pinions in depending on the value of the discharge pressure of the pump. Variation of the pump engagement length thus makes it possible to adapt the displacement of the pump to the needs of the engine.
  • An object of the present invention is to provide a oil pump for the lubrication circuit of a internal combustion, overcoming all or part of the disadvantages of the prior art noted above.
  • the oil pump for lubrication circuit of an internal combustion engine has a housing comprising a suction port and a discharge orifice opening into an internal recess in which are arranged a pinion driving integral in rotation of a drive shaft and a driven pinion mounted on a driven shaft, the pinions being and able to mesh mutually to transfer oil from the suction port towards the discharge port, the pump comprising at least a second pair of gears driving and driving meshing mutually mounted respectively on the shafts of control and led, and maneuvering means suitable for disengage or make rotational the second pinion leading and control shaft, depending on the pressure of pump discharge.
  • the maneuvering means automatically ensure the rotational separation of the second driving gear and drive shaft when the pump discharge pressure is greater than one determined pressure, and make the rotation integral second pinion leading from the drive shaft when the pump discharge pressure is less than this pressure.
  • the second driving pinion is mounted freely in rotation on the control shaft, the means maneuver comprising a key movable radially by relation to the motor shaft in a bore or passage formed in the body of the pinion and extending into the body of the shaft control, return means urging the key in a rotational securing position of the second pinion leading from the drive shaft, a feed hole being formed in the body of the housing and / or in the pinion and / or in the control tree, to relate the oil driven back with the key so that when the pressure of pump discharge exceeds a determined pressure, the key is moved in its corridor so as to make disconnect in rotation the second driving pinion and the shaft of ordered.
  • the supply drilling is formed in a wall of the pump housing and extends longitudinally in the body of the control shaft for lead into the keyway, the return means being made up of a compression spring supported by a of its ends on the bottom of the corridor provided for the key and by its other end on the key.
  • the driving pinions are mounted side by side on the control shaft, drilling oil supply opening into a radial groove formed on the control shaft and / or in the body of one to less drive gables, at the side faces adjacent of the two driving pinions, to spare a film oil between them and prevent entrainment in rotation of the second pinion leading through the first pinion leading when the second pinion is disengaged in rotation of the control shaft.
  • the invention relates to a gear oil pump. intended for supplying the lubrication circuit of a internal combustion engine.
  • the pump conventionally comprises a housing 1 comprising a suction port and a discharge port opening into an interior recess in which are arranged a driving pinion 2 and a driven pinion 3.
  • the pinion leading 2 is integral in rotation with a control shaft 10 or motor shaft rotated from the crankshaft.
  • the driven pinion 3 is in turn integral in rotation with a shaft led 11 mounted free in rotation in the housing 1 of the pump.
  • the axes of rotation of the pinions driving 2 and driving 3 are parallel and arranged so that the pinions 2, 3 mesh with each other to transfer oil from the orifice suction to the discharge port, i.e. from upstream E downstream S as shown in Figures 1 and 2.
  • the pump comprises a second pair pinions driving 4 and driven 5 mounted respectively on the control shafts 10 and led 11. Furthermore, the pump is provided with maneuvering means 6 to 9 suitable for, selectively, to separate or to make rotationally integral the second pinion 4 leading from the control shaft 10, depending on the pump discharge pressure.
  • the two driving pinions 2, 4 are mounted side by side on the control shaft 10, the second driving pinion 4 being mounted freely in rotation on this shaft 10.
  • the two pinions leds 3, 5 are mounted side by side on the driven shaft 11 of so as to mesh respectively with the two pinions 2, 4 leading.
  • the two driven pinions 3, 5 are mounted free in rotation on the driven axis 11.
  • the driven pinion 3 which meshes with the first gear 2 driving is linked in rotation with the driven shaft 11, that is to say that the pinions of the first pair of pinions are rigidly linked in rotation with their shaft 10, 11 respective.
  • the maneuvering means 6 to 9 comprise a key 8 radially movable relative to the control shaft 10 in a bore or passage formed in the body of the pinion 4 and extending into the body of the control shaft 10.
  • a compression spring 9 is arranged at the bottom of the corridor provided for the key 8.
  • the compression spring 9 is supported by one of its ends on the bottom of the corridor, inside the second pinion leading 4.
  • the other end of the spring 9 is supported on a first end of the key 8.
  • a drilling hole 6, 7 intended to put in relation the oil discharged with the second end of the key 8 is formed in a wall of the housing 1 of the pump and extends longitudinally in the body of the control shaft 10 to lead into the keyway 8.
  • the stiffness of the spring 9 is determined so that, when the pump discharge pressure is lower at a determined pressure Pmax, the key 8 is in a position in its corridor in which it makes solidarity in rotation of the second driving pinion 4 and the control shaft 10. In other words, the displacement of the pump is ensured by the first pair 2, 3 and the second pair 4, 5 of pinions.
  • the value of the pressure Pmax above which the second driving pinion 4 is no longer rotated by the control shaft 10 is easily determined as a function engine operating characteristics and pump.
  • a radial groove 12 can be formed on the control shaft 10 at the side faces adjacent two driving gears 2, 4. Drilling supply 6, 7 of the oil opens into the radial groove 12 so that part of the oil that passes through the duct supply 6, 7 forms an oil film between the two pinions 2, 4 leading. This oil film thus prevents entrainment in friction rotation of the second pinion 4 by the first pinion 2 when the second pinion 4 is separated in rotation from the control shaft 10.
  • the oil pump according to the invention is of a simple structure, because it involves a small number of parts.
  • the mechanism for varying the displacement of the pump as a function of the pressure of backflow can be applied to existing pumps, without impose large changes and without increasing their size.
  • the invention cannot be limited to the example described above. So other modes of realization within the reach of the skilled person also enter in the context of the invention.
  • the means of operation (movable key, return spring and conduit oil supply) of the different drive gears can be shaped to separate these driving pinions from the tree control at different pressure values of pump discharge. In this way, the oil pump adapts its displacement more finely to the needs of the engine.
  • the radial groove designed to provide an oil film between two adjacent drive gables can be formed also on the side faces of the sprocket (s) concerned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP19990402312 1998-09-22 1999-09-22 Schmierpumpe einer Brennkraftmaschine Expired - Lifetime EP0989303B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9811793A FR2783575B1 (fr) 1998-09-22 1998-09-22 Pompe a huile pour circuit de lubrification d'un moteur a combustion interne
FR9811793 1998-09-22

Publications (2)

Publication Number Publication Date
EP0989303A1 true EP0989303A1 (de) 2000-03-29
EP0989303B1 EP0989303B1 (de) 2002-10-09

Family

ID=9530688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990402312 Expired - Lifetime EP0989303B1 (de) 1998-09-22 1999-09-22 Schmierpumpe einer Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0989303B1 (de)
DE (1) DE69903393D1 (de)
FR (1) FR2783575B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1087138A3 (de) * 1999-09-25 2002-07-10 Bayerische Motoren Werke Aktiengesellschaft Innenzahnradpumpen umfassendes Pumpenaggregat
EP1211419A3 (de) * 2000-11-30 2003-10-15 Robert Bosch Gmbh Vorrichtung zum Fördern von Flüssigkeiten, insbesondere Kraftstoff
DE102004022362A1 (de) * 2004-05-06 2005-12-01 Audi Ag Schaltbare mehrstufige Ölpumpe
DE102004024217B3 (de) * 2004-05-15 2006-03-16 Audi Ag Schaltbare mehrstufige Ölpumpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1796814A (en) * 1924-05-24 1931-03-17 Western Electric Co Pump
DE4134219A1 (de) * 1990-10-29 1992-04-30 Volkswagen Ag Zahnradpumpe mit veraenderbarem foerdervolumen
DE4317645A1 (de) * 1993-05-27 1994-12-01 Iav Motor Gmbh Regelbare Zahnradpumpe
JPH10153108A (ja) * 1996-11-25 1998-06-09 Nissan Diesel Motor Co Ltd ギヤ駆動式のオイルポンプ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711739B1 (fr) 1993-10-26 1995-11-24 Renault Pompe de lubrification pour moteur à combustion interne.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1796814A (en) * 1924-05-24 1931-03-17 Western Electric Co Pump
DE4134219A1 (de) * 1990-10-29 1992-04-30 Volkswagen Ag Zahnradpumpe mit veraenderbarem foerdervolumen
DE4317645A1 (de) * 1993-05-27 1994-12-01 Iav Motor Gmbh Regelbare Zahnradpumpe
JPH10153108A (ja) * 1996-11-25 1998-06-09 Nissan Diesel Motor Co Ltd ギヤ駆動式のオイルポンプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 098, no. 011 30 September 1998 (1998-09-30) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1087138A3 (de) * 1999-09-25 2002-07-10 Bayerische Motoren Werke Aktiengesellschaft Innenzahnradpumpen umfassendes Pumpenaggregat
EP1211419A3 (de) * 2000-11-30 2003-10-15 Robert Bosch Gmbh Vorrichtung zum Fördern von Flüssigkeiten, insbesondere Kraftstoff
DE102004022362A1 (de) * 2004-05-06 2005-12-01 Audi Ag Schaltbare mehrstufige Ölpumpe
DE102004022362B4 (de) * 2004-05-06 2006-02-02 Audi Ag Schaltbare mehrstufige Ölpumpe
DE102004024217B3 (de) * 2004-05-15 2006-03-16 Audi Ag Schaltbare mehrstufige Ölpumpe

Also Published As

Publication number Publication date
FR2783575B1 (fr) 2002-03-08
DE69903393D1 (de) 2002-11-14
FR2783575A1 (fr) 2000-03-24
EP0989303B1 (de) 2002-10-09

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