EP0371841A1 - Kühlkreis einer Brennkraftmaschine eines Kraftwagens - Google Patents

Kühlkreis einer Brennkraftmaschine eines Kraftwagens Download PDF

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Publication number
EP0371841A1
EP0371841A1 EP89403089A EP89403089A EP0371841A1 EP 0371841 A1 EP0371841 A1 EP 0371841A1 EP 89403089 A EP89403089 A EP 89403089A EP 89403089 A EP89403089 A EP 89403089A EP 0371841 A1 EP0371841 A1 EP 0371841A1
Authority
EP
European Patent Office
Prior art keywords
pipe
valve member
valve
pump
fluid
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
EP89403089A
Other languages
English (en)
French (fr)
Other versions
EP0371841B1 (de
Inventor
Michel Leborne
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 EP0371841A1 publication Critical patent/EP0371841A1/de
Application granted granted Critical
Publication of EP0371841B1 publication Critical patent/EP0371841B1/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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a liquid cooling circuit, such as water, of an internal combustion engine of a motor vehicle.
  • Such circuits are generally known comprising a pump for supplying coolant to the engine having an outlet connected to the engine and an inlet connected on the one hand to a radiator for cooling the liquid by a pipe whose downstream end comprises a thermostat. with valve the opening of which occurs when the temperature of the fluid reaches a predetermined upper threshold value and on the other hand to an expansion vessel by another pipe comprising a valve member whose opening ensures the flow of the fluid only in the expansion tank to pump direction.
  • the closed position of the thermostat valve makes it possible to deactivate a part of the circuit when the engine is cold, in particular that relating to the circulation of the fluid leaving the cylinder head of the engine and going to the pump via the radiator so as to accelerate the temperature rises of the liquid in the engine and in the exchanger device (air heater) used for heating the passenger compartment of the vehicle.
  • the heating performance in the passenger compartment of the vehicle is improved in particular in cold weather, at low engine speeds and loads.
  • the object of the present invention is to eliminate the above drawback by proposing a cooling circuit for an internal combustion engine of the type described in the preamble of claim 1 and characterized in that the downstream end part of the other pipe opens downstream of the thermostat valve and in that the valve member is disposed at one end of the other pipe, and opens when the vacuum at the inlet of the pump reaches a threshold value slightly lower than a vacuum value producing the cavitation of the liquid.
  • the valve member is arranged in the connection part of the above-mentioned other pipe at the bottom of the expansion tank.
  • valve member is housed in a cylindrical body integral at one of its ends with the bottom of the expansion tank and at its other opposite end from the other pipe coaxially with the latter and is held against its seat d sealing made at the bottom of the expansion vessel by a spring mounted prestressed between the valve member and a retaining wall with passage openings for the fluid integral with the opposite end of the cylindrical body.
  • valve member is arranged in the aforementioned opening part of the other pipe.
  • valve member is housed in a body integrated in the thermostat body and held in abutment against its sealing seat by a prestressed spring parallel to the prestressed spring for holding the aforementioned valve against its seat. sealing.
  • valve member is in the form of a flat ring coaxially surrounding the retaining spring of the thermostat valve and the sealing seat of the valve member is made in one piece with the valve seat. .
  • the aforementioned opening part is an annular chamber produced in a bulge of the downstream end of the pipe connecting the radiator to the pump.
  • the reference 1 designates an internal combustion engine of a motor vehicle comprising a cylinder block (not shown) surmounted by a cylinder head 2 with outlet connector 3.
  • a pipe 4 connects an outlet of the cylinder head 2 at the inlet of a radiator 5 for cooling an engine fluid.
  • the radiator outlet 5 is connected to an inlet pipe 6a of a pump 6 via a pipe 7, the outlet of the pump 6 being connected to the cylinder block of the engine 1 via a line 8 for injecting engine coolant.
  • a permanent bypass or bypass pipe 9 connects an outlet of the cylinder head 2 to the pump 6.
  • a pipe 10 connects the outlet of the cylinder head 2 to the inlet of a heat exchanger device (air heater) 11 for heating of the passenger compartment of the vehicle and the outlet of which is connected to a pipe 12 which is connected in communication with the fluid to the pipe 9.
  • An air-engine oil exchanger device 13 is connected to the outlet of the cylinder head 2 by a pipe 14 and to its outlet connecting in communication with the fluid to the pipe 7 via a pipe 15.
  • An expansion vessel 16 is connected by a pipe 17 to the outlet of the cylinder head 2 and to its outlet connected to the inlet pipe 6a of the pump 6 via line 18.
  • a thermostat device 19 blocking the passage of the fluid in the pipe 7 towards the tubing 6a for temperature values of the fluid in the pipe 7 less than a predetermined value, for example 80 ° C.
  • the pipe 18 has, at one upstream or downstream, from its ends a valve member whose open position allows the fluid to flow only in the direction of the expansion tank 16 towards the pump 6.
  • valve member 20 is disposed in a downstream end portion of the pipe 18 preferably opening, when the valve member 20 is open, downstream of the valve of the thermostat device 19
  • the arrival of the fluid coming from the expansion tank 16 is located upstream of the thermostat device 19 and the end of the pipe 18 is extended by a through part 21 in which the sealing seat is located. 22 of the valve member 20 which is held in the closed position in abutment against the seat 22 downstream of this seat by a pre-stressed spring 23 disposed in the terminal portion of the through part parallel to the direction of flow of the fluid in the tubing inlet 6a of the pump 6.
  • the arrival of the fluid coming from the expansion tank 16 is located downstream of the thermostat device 19 and the end part of the pipe 18 is extended by the through part 21 comprising the spring 23 also parallel to the direction of flow of the fluid in the tube 6a and maintaining the valve member 20 in the closed position against its sealing seat 22 which is thus located downstream of the thermostat device 19.
  • FIG 4 shows in detail a particular embodiment of the arrangement corresponding to that shown in Figure 2.
  • the downstream end portion of the pipe 7 has a bulge 7a in which is defined the through portion 21 in the form of chamber annular disposed coaxially to the longitudinal axis of the inlet pipe 6a and in fluid communication with the pipe 18 by means of a radial opening 7b produced in the bulge 7a and opening outwardly, the downstream end of the pipe 18 can be fitted into the orifice 7b.
  • the annular chamber 21 thus comprises a dome-shaped part defining an internal annular wall 7c of the pipe 7 and an external annular wall 7d for connection to the pipe 6a.
  • a frustoconical opening is defined against which abuts, by means of a seal J1, a portion of the upper part in frusto-cone 24a of the body 24 of the device thermostat 19.
  • the part 24a is surmounted by an upper terminal structure with three ribs 24b arranged at 120 degrees with respect to each other and converging in the pipe 7 into a common central part in the form of a cap 25 to which they are connected.
  • the upper face of the frusto-conical part 24a has three orifices 24a1 allowing the passage of the fluid in the pipe 7 to the inlet pipe 6a when the valve 26 of the thermostat device 19 is released from its sealing seat formed in the frusto-conical part 24a just downstream from holes 24a1.
  • the thermostat device 19 is of the thermostatic capsule 27 type, known per se, in the form of a generally cylindrical body arranged coaxially with the pipe 6a while extending on either side of the connection plane of the pipe 7 to the pipe. 6a.
  • the valve 26 consists of a metal plate in the form of a washer 26a coaxial with the longitudinal axis of the tube 6a and integral with the body of the capsule 27.
  • the circular end part of the plate 26a is embedded in a joint d sealing 26b, the external part of which ensuring the tight sealing of the orifices 24a1 is of frustoconical shape.
  • the body 24 has a cylindrical wall 24c connecting to the frustoconical wall 24a by means of an annular plane wall 24d perpendicular to the wall 24c.
  • the wall 24c ends in an external annular rim 24c embedded in an annular seal 28 between the pipe 7 and the pipe 6a.
  • the body 24 further comprises in its lower part three branches 24f, only one of which is shown in Figure 4, and arranged at 120 degrees from each other.
  • Each branch ends in a cup-shaped part 24f1 against which the end turn of a pre-stressed spring 29 bears, the opposite end turn of which rests in the seal 26b so as to keep the seal 26b in pressure pressed against the valve sealing seat 26 in the closed position thereof.
  • the annular wall 24d has orifices 24d1 for the passage of the fluid in the pipe 18 towards the tube 6a and acts as a sealing seat for the valve-forming member 20 in the form flat ring coaxially surrounding the spring 29. It is thus understood that the sealing seat of the valve 26 and the sealing seat of the valve member are made in one piece.
  • the valve member 20 has on its upper face an annular sealing gasket 30.
  • the valve member 20 is disposed in a body 31 generally in shape of cylindrical ring integrated in the cylindrical wall 24c while being integral with the latter.
  • the body 31 has a lower spring retaining rim 23 mounted in this way prestressed between this rim and the valve member 20, parallel to the spring 29.
  • the valve member 20 is located downstream of the valve sealing seat 26 .
  • the valve 26 of the thermostat device 19 is closed so that the fluid passage circuits comprising respectively the line 4, the radiator 5, the line 7 and the line 14, the exchanger 13, the line 15 is out of service.
  • the valve member remains closed and the fluid circuit comprising the line 17, the expansion tank 16 and line 18 is out of service. In this way, there is a rapid rise in temperature in the engine and in the exchanger 11.
  • the vacuum at pump inlet reaches a given threshold value slightly lower than the depression causing the fluid to cavitate.
  • valve member 20 opens, the spring 23 being calibrated in correspondence with the threshold value, and puts in communication the additional fluid circuit formed by the pipe 17, the expansion tank 16 and the pipe 18 , in addition to the permanent bypass 9 and the pipe circuit 10, exchanger 11, pipe 12, with the inlet manifold 6a of the pump 6.
  • the two curves in solid lines A ′ and B ′ represent respectively the inlet and outlet pressures of the pump with a conventional thermostat device.
  • the body 27 is lowered with the valve 26, thus authorizing the flow of the fluid in the pipe 7 towards the tubing 6a through the orifices 24a1.
  • FIG. 6 represents another embodiment of the invention, the operating principle of which also makes it possible to obtain the curves A and B of FIG. 7 and according to which the valve member 20 is disposed at the upstream end of the driving 18 in the part of connection of this pipe to the bottom 16a of the expansion tank 16. More specifically, the valve member 20 is housed in a cylindrical body 32 secured to one of its ends of the bottom 16a of the tank 16 and to its other opposite end from the upstream end of the pipe 18 coaxially with the latter.
  • valve member 20 is held against its sealing seat formed in the bottom 16a of the vessel 16 by the spring 23 mounted prestressed between the member 20 and a retaining wall 33 with orifices 33a for passage of the fluid contained in the vessel 16, the retaining wall 33 being integral with the end of the body 32 secured in the pipe 18.
  • the pipe 18 opens directly downstream of the valve 26 of the thermostat device 19.
  • the valve member 20 is sensitive to the depression in the same way as for the valve member described in FIG. 4 or in FIG. 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)
EP19890403089 1988-11-28 1989-11-08 Kühlkreis einer Brennkraftmaschine eines Kraftwagens Expired - Lifetime EP0371841B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8815530A FR2639675B1 (fr) 1988-11-28 1988-11-28 Circuit de refroidissement d'un moteur a combustion interne d'un vehicule automobile
FR8815530 1988-11-28

Publications (2)

Publication Number Publication Date
EP0371841A1 true EP0371841A1 (de) 1990-06-06
EP0371841B1 EP0371841B1 (de) 1992-07-08

Family

ID=9372326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890403089 Expired - Lifetime EP0371841B1 (de) 1988-11-28 1989-11-08 Kühlkreis einer Brennkraftmaschine eines Kraftwagens

Country Status (3)

Country Link
EP (1) EP0371841B1 (de)
DE (1) DE68902043T2 (de)
FR (1) FR2639675B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613998B1 (de) * 1993-03-01 1997-08-20 Automobiles Peugeot Kühlungseinrichtung einer Brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2007831A (en) * 1977-11-10 1979-05-23 Berliet Automobiles Cooling system for an internal combustion engine
DE3143749A1 (de) * 1981-11-04 1983-05-11 Magirus-Deutz Ag, 7900 Ulm Vorrichtung zur absicherung des wasserdruckes im kuehlwasserkreislauf einer brennkraftmaschine
US4461342A (en) * 1982-04-29 1984-07-24 Avrea Walter C Method and apparatus for automatically refilling a leaking liquid cooling system as an engine operates by utilizing a radiator and a remote coolant reservoir
EP0157167A1 (de) * 1982-07-15 1985-10-09 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Kühlkreis für Brennkraftmaschinen
FR2600117A1 (fr) * 1986-06-14 1987-12-18 Volkswagen Ag Dispositif de refroidissement de moteur a combustion interne a reservoir d'expansion en deux compartiments

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2007831A (en) * 1977-11-10 1979-05-23 Berliet Automobiles Cooling system for an internal combustion engine
DE3143749A1 (de) * 1981-11-04 1983-05-11 Magirus-Deutz Ag, 7900 Ulm Vorrichtung zur absicherung des wasserdruckes im kuehlwasserkreislauf einer brennkraftmaschine
US4461342A (en) * 1982-04-29 1984-07-24 Avrea Walter C Method and apparatus for automatically refilling a leaking liquid cooling system as an engine operates by utilizing a radiator and a remote coolant reservoir
EP0157167A1 (de) * 1982-07-15 1985-10-09 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Kühlkreis für Brennkraftmaschinen
FR2600117A1 (fr) * 1986-06-14 1987-12-18 Volkswagen Ag Dispositif de refroidissement de moteur a combustion interne a reservoir d'expansion en deux compartiments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0613998B1 (de) * 1993-03-01 1997-08-20 Automobiles Peugeot Kühlungseinrichtung einer Brennkraftmaschine

Also Published As

Publication number Publication date
FR2639675B1 (fr) 1991-03-22
EP0371841B1 (de) 1992-07-08
FR2639675A1 (fr) 1990-06-01
DE68902043T2 (de) 1993-03-04
DE68902043D1 (de) 1992-08-13

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