EP0624719A1 - Druckbegrenzungsvorrichtung in einem Schmierkreislauf einer Brennkraftmaschine - Google Patents

Druckbegrenzungsvorrichtung in einem Schmierkreislauf einer Brennkraftmaschine Download PDF

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Publication number
EP0624719A1
EP0624719A1 EP94401051A EP94401051A EP0624719A1 EP 0624719 A1 EP0624719 A1 EP 0624719A1 EP 94401051 A EP94401051 A EP 94401051A EP 94401051 A EP94401051 A EP 94401051A EP 0624719 A1 EP0624719 A1 EP 0624719A1
Authority
EP
European Patent Office
Prior art keywords
spring
pressure
piston
shutter member
return
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Withdrawn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
EP94401051A
Other languages
English (en)
French (fr)
Inventor
Guy Dardelet
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0624719A1 publication Critical patent/EP0624719A1/de
Withdrawn legal-status Critical Current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
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity

Definitions

  • the present invention relates to a device for limiting the pressure in a lubrication circuit of an internal combustion engine, so as to limit the pressure of the oil discharged into the circuit by a pump driven in rotation by the engine.
  • Relief valves generally include a hollow body disposed at the inlet of the return pipe which contains a movable shutter member (such as a piston, a ball or even a valve) which is permanently biased by a spring against a stop. or a seat provided at one of the open ends of the body, against the hydraulic pressure exerted on the active face of the organ.
  • a movable shutter member such as a piston, a ball or even a valve
  • Such an arrangement has a certain number of drawbacks, and in particular a relatively large size and noise.
  • the action of the return spring tends to cause the shock of the shutter member on its seat or on its stop when it is closed, and this shock is all the more violent as the stiffness of the spring is strong.
  • a spring of fairly low stiffness which then requires having a spring of great length to keep the same threshold value.
  • the present invention therefore relates to a simple embodiment of such a device for limiting the pressure in a lubrication circuit, making it possible to remedy the drawbacks of the prior art, while ensuring both a reduced bulk and the elimination of all noisiness.
  • the pressure limiting device of oil in a pressurized lubrication circuit of an internal combustion engine includes a discharge valve adapted to close a return line connecting the discharge line of the pump to the suction line of that -ci or to a reservoir, this valve comprising a body containing a shutter member urged to close by a return spring.
  • the pressure limiting device is characterized in that a second return spring acts on the shutter member in the direction opposite to said first return spring.
  • the shutter member rests in the closed position against the second spring, the second spring then constituting an elastic stop for the shutter member.
  • the shutter member is formed by a piston mounted to slide in a corresponding cylindrical bore, this piston being subjected to the antagonistic action of two helical springs of pressure s extending between the ends of the bore and the piston.
  • the first helical spring recalling the piston in its closed position has a stiffness much greater than that of the second spring, which makes it possible to obtain an extremely compact device.
  • a device for limiting the pressure in a lubrication circuit which essentially comprises a discharge valve 1.
  • This valve 1 comprises a hollow body 2 containing a shutter member such as a piston 3 mounted sliding in a corresponding cylindrical bore 4.
  • the bore is provided with an inlet orifice 10 communicating with the discharge pipe of the oil pump not shown, and with an outlet orifice 9 communicating with a return pipe to the oil tank or to the suction line of the pump.
  • the inlet orifice 10 opens at one end of the bore 4 and the thrust of the pumped oil is exerted on one of the transverse faces of the piston 3 delimiting a pressure chamber 6.
  • the outlet orifice 9 opens into the side wall of the bore and can be masked by the piston 3 when the latter occupies its closed position in the bore 4.
  • a first helical spring 7 of high stiffness acts on the face of the piston opposite to the pressure chamber 6, to return the piston 3 to its closed position.
  • a second spring 8 of low stiffness is arranged in the pressure chamber 6 and constitutes an elastic stop for the piston 3 subjected to the thrust of the spring 7.
  • the operating mode of the oil pressure limiting device is as follows.
  • the active face of the piston 3 subjected to the hydraulic pressure action always has the same surface, in fact the spring 8 is permanently in contact with the piston 3, and this, unlike the devices according to the prior art where the shutter members come to bear against fixed seats.
  • This arrangement therefore eliminates the sudden variations in thrust due to the separation of the obturator member from its seat, causing untimely beating of the spring 7 and of the piston 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)
EP94401051A 1993-05-14 1994-05-11 Druckbegrenzungsvorrichtung in einem Schmierkreislauf einer Brennkraftmaschine Withdrawn EP0624719A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9305821A FR2705403B1 (fr) 1993-05-14 1993-05-14 Dispositif de limitation de la pression dans un circuit de lubrification de moteur.
FR9305821 1993-05-14

Publications (1)

Publication Number Publication Date
EP0624719A1 true EP0624719A1 (de) 1994-11-17

Family

ID=9447127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401051A Withdrawn EP0624719A1 (de) 1993-05-14 1994-05-11 Druckbegrenzungsvorrichtung in einem Schmierkreislauf einer Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0624719A1 (de)
FR (1) FR2705403B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005851A1 (en) 1996-08-02 1998-02-12 Ford Global Technologies, Inc. Device for limiting the oil pressure in the lubricating oil circuit of an internal combustion engine
EP0909884A1 (de) * 1997-10-16 1999-04-21 TCG UNITECH Aktiengesellschaft Druckregelungsventil
WO2008070712A1 (en) * 2006-12-05 2008-06-12 General Electric Company System, method, and computer software code for controlling engine warm up of a diesel powered system
CN106015668A (zh) * 2016-05-31 2016-10-12 柳州柳工挖掘机有限公司 一种比例卸荷阀
CN113074029A (zh) * 2021-04-14 2021-07-06 浙江尔格科技股份有限公司 一种机油泵减压阀及使用该减压阀的内燃机用机油泵

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674268A (en) * 1949-10-29 1954-04-06 Standard Thompson Corp Device for controlling the communication between a pressure tank and the atmosphere
EP0110289A1 (de) * 1982-12-06 1984-06-13 Deere & Company Ausgleichventil
FR2649775A1 (fr) * 1989-07-12 1991-01-18 Peugeot Clapet anti-retour en particulier pour un circuit de liquide sous pression dans un moteur a combustion interne
FR2673677A1 (fr) * 1991-03-06 1992-09-11 Renault Procede de lubrification pour moteur a combustion interne et dispositif pour sa mise en óoeuvre.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674268A (en) * 1949-10-29 1954-04-06 Standard Thompson Corp Device for controlling the communication between a pressure tank and the atmosphere
EP0110289A1 (de) * 1982-12-06 1984-06-13 Deere & Company Ausgleichventil
FR2649775A1 (fr) * 1989-07-12 1991-01-18 Peugeot Clapet anti-retour en particulier pour un circuit de liquide sous pression dans un moteur a combustion interne
FR2673677A1 (fr) * 1991-03-06 1992-09-11 Renault Procede de lubrification pour moteur a combustion interne et dispositif pour sa mise en óoeuvre.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005851A1 (en) 1996-08-02 1998-02-12 Ford Global Technologies, Inc. Device for limiting the oil pressure in the lubricating oil circuit of an internal combustion engine
DE19631296C2 (de) * 1996-08-02 1999-06-10 Ford Global Tech Inc Vorrichtung zur Begrenzung des Öldrucks in dem Schmierölkreislauf einer Verbrennungskraftmaschine
EP0909884A1 (de) * 1997-10-16 1999-04-21 TCG UNITECH Aktiengesellschaft Druckregelungsventil
WO2008070712A1 (en) * 2006-12-05 2008-06-12 General Electric Company System, method, and computer software code for controlling engine warm up of a diesel powered system
CN106015668A (zh) * 2016-05-31 2016-10-12 柳州柳工挖掘机有限公司 一种比例卸荷阀
CN106015668B (zh) * 2016-05-31 2018-09-18 柳州柳工挖掘机有限公司 一种比例卸荷阀
CN113074029A (zh) * 2021-04-14 2021-07-06 浙江尔格科技股份有限公司 一种机油泵减压阀及使用该减压阀的内燃机用机油泵

Also Published As

Publication number Publication date
FR2705403B1 (fr) 1995-06-23
FR2705403A1 (fr) 1994-11-25

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