EP0371841B1 - Kühlkreis einer Brennkraftmaschine eines Kraftwagens - Google Patents

Kühlkreis einer Brennkraftmaschine eines Kraftwagens Download PDF

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Publication number
EP0371841B1
EP0371841B1 EP19890403089 EP89403089A EP0371841B1 EP 0371841 B1 EP0371841 B1 EP 0371841B1 EP 19890403089 EP19890403089 EP 19890403089 EP 89403089 A EP89403089 A EP 89403089A EP 0371841 B1 EP0371841 B1 EP 0371841B1
Authority
EP
European Patent Office
Prior art keywords
pump
valve
duct
thermostat
pipe
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.)
Expired - Lifetime
Application number
EP19890403089
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English (en)
French (fr)
Other versions
EP0371841A1 (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.
  • EP-A-O 157 167 describes a cooling circuit comprising the characteristics set out in the preamble of claim 1.
  • the present invention proposes, with respect to the above prior document, a cooling circuit according to which the thermostat and the valve member form a compact unit and therefore compact.
  • valve member is arranged at the downstream end of the pipe, is housed with the pre-stressed spring calibrated at the threshold value in a body integrated in the body of the thermostat so that the retaining spring the member is parallel to the valve retaining spring, is located in an annular chamber formed in a bulge in the downstream end of the pipe connecting the radiator to the pump and is in the form of a flat ring coaxially surrounding the spring of holding, the sealing seat of the valve member and the sealing seat of the thermostat valve being formed in the body of the thermostat.
  • 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 fluid communication to the pipe 7 by a pipe 15.
  • An expansion tank 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 pipe 6a for temperature values of the fluid in the pipe 7 less than a predetermined value, for example 80 ° C.
  • the pipe 18 comprises, at one, upstream or downstream, of its ends, a valve member the open position of which 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 prestressed spring 23 disposed in the end 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 arranged 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 thermostat device 19.
  • Part 24a is surmounted by an upper terminal structure with three ribs 24b arranged at 120 degrees relative to each other and converging in line 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 fluid in the pipe 7 towards 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 capsule ends at its upper part with respect to FIG. 4 by a rod 27a, the free end of which bears on the cap 25 and on which the body of the capsule is capable of moving coaxially with the longitudinal axis of the tubing 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 24e 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)

Claims (1)

1. Kreislauf zum Kühlen durch eine Flüssigkeit wie Wasser einer Brennkraftmaschine (1) eines Kraftfahrzeugs, derjenigen Gattung mit einer Pumpe (6), die einen durch eine Leitung (8) mit dem Motor (1) verbundenen Auslass und einen Einlass (6a) hat, der einerseits mit einem Kühler (5) zur Kühlung der Flüssigkeit durch eine Leitung (7) verbunden ist, deren unterstromiges Ende einen Thermostat (19) mit einem, in Abstützung gegen seinen Dichtungssitz durch eine vorgespannte Feder (29) gehaltenen Ventil (26) aufweist, dessen Offnen dann stattfindet, wenn die Temperatur des strömungsfähigen Mittels einen vorbestimmten höheren Schwellenwert erreicht und andererseits mit einem Ausdehnungsgefäss (16) durch eine andere Leitung (18) verbunden ist, welche ein gegen seinen Dichtungssitz durch eine vorgespannte Feder (23) gehaltenes Ventilglied (20) umfasst und dessen Oeffnung die Strömung des fliessfähigen Mittels nur in der Richtung vom Ausdehnungsgefäss (16) zur Pumpe (6) hin gewährleistet, wobei der unterstromige Endteil der anderen Leitung (18) stromabwärts von dem Ventil (26) des Thermostats (19) mündet und wobei das Ventilglied (20) an einem der Enden der das Ausdehnungsgefäss (16) mit dem Einlass (6a) der Pumpe (6) unmittelbar verbindenden Leitung (18) angeordnet ist, und sich öffnet, um das Fliessen der Flüssigkeit von dem Ausdehnungsgefäss (16) zur Pumpe (6) hin zu gestatten, wenn der Unterdruck am Einlass der Pumpe (6) einen Schwellenwert erreicht, der etwas niedriger als ein eine Kavitation der Flüssigkeit erzeugende Unterdruckwert ist, dadurch gekennzeichnet, dass das Ventilglied (20) an dem unterstromigen Ende (21) der Leitung (18) angeordnet ist, mit der auf dem Schwellenwert geeichten vorgespannten Feder (23) in einem in dem Körper (24) des Thermostats (19) eingegliederten Körper (31) derart untergebracht ist, dass die Feder (23) zum Halten des Gliedes (20) mit der Feder (29) des Ventils (26) parallel ist, in einer, in einem Wulst (7a) des unterstromigen Endes der den Kühler (5) mit der Pumpe (6) verbindenden Leitung (7) ausgebildeten ringförmigen Kammer gelegen ist, und als die Haltefeder (29) koaxial umgebenden Flachring gestaltet ist, und dass der Dichtungssitz des Ventilgliedes (20) und der Dichtungssitz des Thermostatsventils (26) in dem Körper (24) des Thermostats (19) ausgebildet sind.
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
FR8815530 1988-11-28
FR8815530A FR2639675B1 (fr) 1988-11-28 1988-11-28 Circuit de refroidissement d'un moteur a combustion interne d'un vehicule automobile

Publications (2)

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

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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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702244B1 (fr) * 1993-03-01 1995-04-21 Peugeot Dispositif de refroidissement pour un moteur à combustion interne.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2408722A1 (fr) * 1977-11-10 1979-06-08 Berliet Automobiles Circuit de refroidissement perfectionne pour un moteur a combustion interne
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
DE3226508C2 (de) * 1982-07-15 1985-12-12 Bayerische Motoren Werke AG, 8000 München Kühlkreis für Brennkraftmaschinen
DE3718697C2 (de) * 1986-06-14 1997-06-19 Volkswagen Ag Kühlanordnung für eine Brennkraftmaschine eines Fahrzeugs

Also Published As

Publication number Publication date
DE68902043D1 (de) 1992-08-13
EP0371841A1 (de) 1990-06-06
FR2639675B1 (fr) 1991-03-22
FR2639675A1 (fr) 1990-06-01
DE68902043T2 (de) 1993-03-04

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