EP0767299A2 - Thermostatic valve for the cooling circuit of an internal combustion engine - Google Patents

Thermostatic valve for the cooling circuit of an internal combustion engine Download PDF

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Publication number
EP0767299A2
EP0767299A2 EP96115636A EP96115636A EP0767299A2 EP 0767299 A2 EP0767299 A2 EP 0767299A2 EP 96115636 A EP96115636 A EP 96115636A EP 96115636 A EP96115636 A EP 96115636A EP 0767299 A2 EP0767299 A2 EP 0767299A2
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EP
European Patent Office
Prior art keywords
valve
short
circuit
expansion element
throttle
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
EP96115636A
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German (de)
French (fr)
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EP0767299A3 (en
EP0767299B1 (en
Inventor
Barbu Frunzetti
Peter Leu
Heinz Lemberger
Gerhart Huemer
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Bayerische Motoren Werke AG
Behr Thermot Tronik GmbH
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Bayerische Motoren Werke AG
Behr Thermot Tronik GmbH
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Application filed by Bayerische Motoren Werke AG, Behr Thermot Tronik GmbH filed Critical Bayerische Motoren Werke AG
Publication of EP0767299A2 publication Critical patent/EP0767299A2/en
Publication of EP0767299A3 publication Critical patent/EP0767299A3/en
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Publication of EP0767299B1 publication Critical patent/EP0767299B1/en
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    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed

Definitions

  • the invention relates to a thermostatic valve of the type specified in the preamble of claim 1.
  • thermostatic valves are common and are known to be used in series engines to control the respective liquid cooling circuit.
  • the expansion element is essentially heated via the inner coolant circulation at least until the main valve begins to open.
  • the heated coolant flowing to the thermostat from an inlet channel of the short-circuit line of the inner coolant circuit, which is openly controlled by the short-circuit valve, is directed according to DE-A 31 38 368 via openings in the short-circuit valve to the expansion element to promote the control quality.
  • the invention has for its object to improve a thermostat of the type described in such a way that its effect on the expansion element of the thermostatic valve is increased when there is a direct flow or flow when the coolant circulates substantially (short-circuit operation).
  • a thermostat with a short-circuit valve controlling the flow cross section at the mouth of an inlet channel of the short-circuit line it is proposed that the mouth of the inlet channel is assigned a nozzle surrounding the short-circuit valve as an additional device with an outflow opening directed towards the expansion element.
  • the advantage of this configuration is in particular the simple design of the nozzle.
  • the additional device comprises a throttle valve with throttle openings, which is guided in an elastically flexible manner and acts on an inlet channel of the short-circuit line, and a nozzle of simple design enclosing the short-circuit valve on the expansion side an outlet opening directed towards the expansion element.
  • the additional device elastically resiliently pressurizes an inlet channel of the short-circuit line guided releasing throttle valve with throttle openings, wherein the short-circuit valve has openings directed towards the expansion element such that the short-circuit valve closes the throttle openings of the throttle valve from a predetermined opening stroke of the main valve (Fig. 3, 4, 5).
  • a thermostatic valve 1 for the cooling circuit of a liquid-cooled internal combustion engine not shown in each case, shown in FIGS. 1 to 4, comprises an expansion element 2, which serves as a servomotor of a main valve 3 in an external coolant circuit for regulating the temperature of the coolant.
  • This arrangement serves that the short-circuit valve 10 in a predetermined In a manner controlled by the opening stroke of the main valve 3 caused by the expansion element 2, a flow cross section of an inlet channel 11 of a short-circuit line 11 'of the inner coolant circuit closes.
  • the short-circuit valve 10 which is usually relatively slightly spaced from the mouth 12 of the inlet channel 11 in the open position - such as in Figure 1 - the flow of the heated coolant with internal coolant circulation or in short-circuit operation from a direct action of the direct action of the expansion element 2 is reached in a short way significantly.
  • an additional device for directing an increased effectiveness of the coolant flow of the inner coolant circulation downstream of the short-circuit valve 10, which is in an open position, onto the expansion element 2 provided.
  • the mouth 12 of the inlet channel 11 is a nozzle 13 enclosing the short-circuit valve 10 as an additional device with an on the expansion element 2 directed outflow opening 14 assigned as a flow control device.
  • a throttle valve 16 with throttle openings 15, which releases the supply duct 11 of the short-circuit line 11 'under elastic pressure, is provided as an additional device, the throttle valve 16 slidingly guided on the extension 9 having a nozzle 17 surrounding the short-circuit valve 10 on the expansion element side is assigned as a further part of the additional device with an outlet opening 18 directed towards the expansion element 2.
  • the throttle openings 15 in the throttle valve 16, which is known to serve as a warm-up valve, can be closed by the plate-like short-circuit valve 10 from a predetermined opening stroke of the main valve 3.
  • each thermostatic valve 1 is equipped according to the invention with a pot-shaped throttle valve 20 as an additional device, each throttle valve 20 having throttle openings 19 arranged in a bottom region 23 adjacent to the pot wall 22.
  • the short-circuit valve 10 designed according to the invention as a poppet valve and guided to the pot wall 22 with a relatively small circumferential clearance, has the openings 21 provided close to a concentrically arranged guide bush 24.
  • the short-circuit valve 10 comprises a sealing ring 25 which leads to the pot wall 22 with relatively no circumferential play and which is connected to a centrally arranged guide bushing 26 via a cone section 27, which advantageously has the effective effect Flow directs to openings 21 arranged in the transition region from the conical section 27 and the guide bush 26.
  • the improved direct inflow or flow around the expansion element 2 in short-circuit operation or in the case of internal coolant circulation with a coolant temperature increased by means of a throttled flow can advantageously be used with a thermostat 1 for map-controlled cooling, for which the expansion element 2 is additionally equipped with an electric heating device 31.
  • This can advantageously be operated in an energy-saving manner due to the fact that the expansion or rinsing of the expansion element increases the effectiveness according to the invention.
  • FIG. 5 shows a preferably simple embodiment of an additional device formed according to the invention from a throttle valve 28 and a short-circuit valve 10, both valves 10, 28 each being designed in the manner of a plate.
  • the valves 10, 28, for example on a housing extension 29 of an expansion element which is supported in a known manner via the control pin on the machine side, are arranged such that they can move relative to one another in such a way that the throttle valve 28 slides on a guide bush 30 facing away from the expansion element on the short-circuit valve 10.
  • the throttle valve 28 assigned to the inlet duct 11 has throttle openings 19 arranged on a pitch circle near the duct wall, whereas the short-circuit valve 10, in contrast, has openings 21 arranged radially inward near the guide bush 30.
  • a targeted flow against the expansion element along its housing extension 29 is additionally achieved with the advantage of rapid heating of the expansion element (not shown) containing a wax element.

Abstract

The thermostatic valve has a main valve (3) and a short-circuit valve (10). The short-circuit valve is allocated an additional device (13) to increase the efficiency of the coolant flow deflected onto the expansion element (2) which regulates the main valve. A short-circuit valve controls the flow cross-section at the mouth (12) of a supply channel (11) of the short-circuit pipe (11'). The mouth has a nozzle (13) enclosing the short-circuit valve and serving as an extra device with an outlet opening (14) directed towards the expansion element.

Description

Die Erfindung bezieht sich auf ein Thermostatventil der im Oberbegriff des Patentanspruches 1 angegebenen Bauart.The invention relates to a thermostatic valve of the type specified in the preamble of claim 1.

Derartige Thermostatventile sind üblich und dienen bekanntlich in Serienmotoren der Steuerung/Regelung des jeweiligen Flüssigkeits-Kühlkreislaufes. Bei aufgrund von relativ kaltem Kühlmittel geschlossenem Hauptventil zum Vorlauf eines Kühlers im äußeren Kühlmittelumlauf ist das Dehnstoffelement im wesentlichen zumindest bis zum Öffnungsbeginn des Hauptventils über den inneren Kühlmittelumlauf erwärmt. Das dem Thermostat aus einem vom Kurzschlußventil offen gesteuerten Zulaufkanal der Kurzsschlußleitung des inneren Kühlmittelumlaufes zuströmende, erwärmte Kühlmittel ist gemäß der DE-A 31 38 368 über im Kurzschlußventil angeordnete Öffnungen auf das Dehnstoffelement gelenkt zur Förderung der Regelgüte.Such thermostatic valves are common and are known to be used in series engines to control the respective liquid cooling circuit. When the main valve is closed due to relatively cold coolant for the forward flow of a cooler in the outer coolant circulation, the expansion element is essentially heated via the inner coolant circulation at least until the main valve begins to open. The heated coolant flowing to the thermostat from an inlet channel of the short-circuit line of the inner coolant circuit, which is openly controlled by the short-circuit valve, is directed according to DE-A 31 38 368 via openings in the short-circuit valve to the expansion element to promote the control quality.

Der Erfindung liegt die Aufgabe zugrunde, einen Thermostaten der eingangs beschriebenen Bauart derart zu verbessern, daß bei im wesentlichen innerem Kühlmittelumlauf (Kurzschlußbetrieb) dessen Wirkung auf das Dehnstoffelement des Thermostatventils bei direkter Um- bzw. Anströmung gesteigert ist.The invention has for its object to improve a thermostat of the type described in such a way that its effect on the expansion element of the thermostatic valve is increased when there is a direct flow or flow when the coolant circulates substantially (short-circuit operation).

Diese Aufgabe ist mit dem Patentanspruch 1 gelöst. Mit der Erfindung einer Zusatzvorrichtung zur Lenkung einer in der Wirksamkeit verbesserten Kühlmittel-Strömung des inneren Kühlmittelumlaufes stromab des in einer Offenstellung befindlichen Kurzschlußventils auf das Dehnstoffelement ist für dieses durch eine gezielt konzentrische Umströmung einerseits und/oder durch eine gesteigerte Kühlmitteltemperatur des über Drosselöffnungen zuströmenden Kühlmittels andererseits eine verzögerte Erwärmung vermieden und mit dem damit rascheren Ansprechverhalten eine weiter verbesserte Regelgüte erzielt.This object is achieved with patent claim 1. With the invention of an additional device for directing a coolant flow which is more effective of the internal coolant circulation downstream of the short-circuit valve in an open position on the expansion element is avoided for this by deliberately concentric flow on the one hand and / or by an increased coolant temperature of the coolant flowing through throttle openings on the other hand and a further improved control quality is achieved with the more rapid response behavior .

Zwar könnte das Ansprechverhalten eines nach dem eingangs geschilderten Stand der Technik ungünstig umströmten Dehnstoffelementes mittels eines beispielsweise aus der DE-A 42 33 913 bekannten elektrischen Heizelementes ebenfalls verbessert werden, jedoch erübrigt sich dieser Aufwand in vorteilhafter Weise mit der Erfindung. Mit der Erfindung ist somit zum einen eine frühzeitige und intensive Erwärmung des Dehnstoffelementes aus dem inneren Kühlmittelumlauf erreicht, und andererseits kann eine für das Dehnstoffelement vorgesehene Heizeinrichtung für eine kennfeldgesteuerte Kühlung energiesparend betrieben werden.Although the response behavior of an expansion element which is unfavorably flowed around according to the prior art described at the outset could also be improved by means of an electrical heating element known for example from DE-A 42 33 913, this effort is advantageously dispensed with with the invention. With the invention, on the one hand, an early and intensive heating of the expansion element from the inner coolant circulation is achieved, and on the other hand, a heating device provided for the expansion element can be operated in an energy-saving manner for map-controlled cooling.

In einer ersten Ausgestaltung der Erfindung wird für einen Thermostaten mit einem an der Mündung eines Zulaufkanals der Kurzschlußleitung den Strömungsquerschnitt steuernden Kurzschlußventil vorgeschlagen, daß der Mündung des Zulaufkanals eine das Kurzschlußventil umschließende Düse als Zusatzvorrichtung mit einer auf das Dehnstoffelement gerichteten Ausströmöffnung zugeordnet ist. Der Vorteil dieser Ausgestaltung liegt insbesondere in der einfachen Gestaltung der Düse.In a first embodiment of the invention, for a thermostat with a short-circuit valve controlling the flow cross section at the mouth of an inlet channel of the short-circuit line, it is proposed that the mouth of the inlet channel is assigned a nozzle surrounding the short-circuit valve as an additional device with an outflow opening directed towards the expansion element. The advantage of this configuration is in particular the simple design of the nozzle.

In einer zweiten Ausgestaltung der Erfindung wird für einen in der P 44 26 435 offenbarten Thermostaten vorgeschlagen, daß die Zusatzeinrichtung ein einen Zulaufkanal der Kurzschlußleitung druckbeaufschlagt elastisch nachgiebig geführt freigebendes Drosselventil mit Drosselöffnungen umfaßt, sowie eine dem Drosselventil dehnstoffseitig das Kurzschlußventil umschließende Düse von einfacher Gestaltung mit einer auf das Dehnstoffelement gerichteten Austrittsöffnung.In a second embodiment of the invention, it is proposed for a thermostat disclosed in P 44 26 435 that the additional device comprises a throttle valve with throttle openings, which is guided in an elastically flexible manner and acts on an inlet channel of the short-circuit line, and a nozzle of simple design enclosing the short-circuit valve on the expansion side an outlet opening directed towards the expansion element.

In einer dritten Ausgestaltung der Erfindung wird für einen weiteren, gemäß der P 44 26 435 gestalteten Thermostat vorgeschlagen, daß die Zusatzvorrichtung ein einen Zulaufkanal der Kurzschlußleitung druckbeaufschlagt elastisch nachgiebig geführt freigebendes Drosselventil mit Drosselöffnungen umfaßt, wobei das Kurzschlußventil auf das Dehnstoffelement gerichtete Druchbrechungen derart angeordnet aufweist, daß das Kurzschlußventil ab einem vorbestimmten Öffnungshub des Hauptventils die Drosselöffnungen des Drosselventils verschließt (Fig. 3, 4, 5).In a third embodiment of the invention, it is proposed for a further thermostat designed according to P 44 26 435 that the additional device elastically resiliently pressurizes an inlet channel of the short-circuit line guided releasing throttle valve with throttle openings, wherein the short-circuit valve has openings directed towards the expansion element such that the short-circuit valve closes the throttle openings of the throttle valve from a predetermined opening stroke of the main valve (Fig. 3, 4, 5).

Bevorzugte Ausbildungen der dritten erfindungsgemäßen Ausgestaltung sind in weiteren Ansprüchen beschrieben. Deren Vorteil ist die Möglichkeit einer relativ niedrigen Bauweise verbunden mit geringem Einbauraum.Preferred embodiments of the third embodiment according to the invention are described in further claims. Their advantage is the possibility of a relatively low construction combined with a small installation space.

Anhand in der Zeichnung dargestellter, bevorzugter Beispiele ist die Erfindung beschrieben. Es zeigt

  • Figur 1 ein übliches Thermostatventil mit einer erfindungsgemäß einem Zulaufkanal einer Kurzschlußleitung zugeordneten Düse als eine Zusatzvorrichtung,
  • Figur 2 ein mit einem zusätzlichen Drosselventil ausgerüstetes Thermostatventil mit einer dem Drosselventil zugeordneten Düse als eine Zusatzvorrichtung, und
  • Figuren 3 und 4 jeweils ein Thermostatventil mit zusätzlichem Drosselventil als eine Zusatzvorrichtung und einem dessen Drosselöffnungen steuernden Kurzschlußventil mit zu den Drosselöffnungen versetzt angeordneten Durchbrechungen in Richtung des Dehnstoffelementes, sowie
  • Figure 5 ein jeweils als Tellenventil gestaltetes Kurzschluß-und Drosselventil.
The invention is described with reference to preferred examples shown in the drawing. It shows
  • FIG. 1 shows a conventional thermostatic valve with a nozzle according to the invention assigned to an inlet channel of a short-circuit line as an additional device,
  • 2 shows a thermostatic valve equipped with an additional throttle valve with a nozzle assigned to the throttle valve as an additional device, and
  • Figures 3 and 4 each have a thermostatic valve with an additional throttle valve as an additional device and a short-circuit valve controlling its throttle openings with openings arranged offset to the throttle openings in the direction of the expansion element, and
  • Figure 5 a short-circuit and throttle valve each designed as a plate valve.

Ein in den Figuren 1 bis 4 jeweils dargestelltes Thermostatventil 1 für den Kühlkreislauf einer nicht näher gezeigten, flüssigkeitsgekühlten Brennkraftmaschine umfaßt ein Dehnstoffelement 2, das als Stellmotor eines Hauptventils 3 in einem äußeren Kühlmittelumlauf der Temperaturregelegung des Kühlmittels dient. Das bei 4 maschinenseitig in einen Deckel 5 abgestützt angeordnete Dehnstoffelement 2 weist am entgegengesetzten Ende einen Steuerstift 6 auf, der über einen U-förmigen Bügel 7 mit dem Hauptventil 3 in Antriebsverbindung steht.A thermostatic valve 1 for the cooling circuit of a liquid-cooled internal combustion engine, not shown in each case, shown in FIGS. 1 to 4, comprises an expansion element 2, which serves as a servomotor of a main valve 3 in an external coolant circuit for regulating the temperature of the coolant. The expansion element 2, which is supported at 4 on the machine side in a cover 5, has a control pin 6 at the opposite end, which is in drive connection with the main valve 3 via a U-shaped bracket 7.

Der in einer balken- oder sternförmig gestalteten Traverse 8 geführte Antriebsbügel 7 weist einen den Steuerstift 6 aufnehmenden Fortsatz 9 auf, der am Außenumfang ein zum Antriebsbügel 7 hin elastisch nachgiebig verlagerbares Kurzsschlußventil 10 trägt. Diese Anordnung dient dazu, daß das Kurzschlußventil 10 in vorbestimmter Weise über den durch das Dehnstoffelement 2 bewirkten Öffnungshub des Hauptventils 3 gesteuert einen Strömungsquerschnitt eines Zulaufkanals 11 einer Kurzschlußleitung 11' des inneren Kühlmittelumlaufes verschließt.The drive bracket 7, which is guided in a bar-shaped or star-shaped crossmember 8, has an extension 9 which receives the control pin 6 and which carries on the outer circumference a short-circuit valve 10 which can be displaced elastically and resiliently toward the drive bracket 7. This arrangement serves that the short-circuit valve 10 in a predetermined In a manner controlled by the opening stroke of the main valve 3 caused by the expansion element 2, a flow cross section of an inlet channel 11 of a short-circuit line 11 'of the inner coolant circuit closes.

Das üblicherweise in Offenstellung von der Mündung 12 des Zulaufkanals 11 relativ gering beabstandete Kurzschlußventil 10 - wie z.B. in Figur 1 - lenkt die Strömung des erwärmten Kühlmittels bei innerem Kühlmittelumlauf bzw. bei Kurzschlußbetrieb von einer auf kurzem Weg erreichten, direkten Beaufschlagung des Dehnstoffelementes 2 deutlich ab.The short-circuit valve 10, which is usually relatively slightly spaced from the mouth 12 of the inlet channel 11 in the open position - such as in Figure 1 - the flow of the heated coolant with internal coolant circulation or in short-circuit operation from a direct action of the direct action of the expansion element 2 is reached in a short way significantly.

Zur Erzielung einer direkten An- bzw. Umströmung des Dehnstoffelementes 2 bei jedem Thermostatventil 1 gemäß den Figuren 1 bis 4 ist jeweils eine Zusatzvorrichtung zur Lenkung einer in der Wirksamkeit gesteigerten Kühlmittel-Strömung des inneren Kühlmittelumlaufes stromab des in einer Offenstellung befindlichen Kurzschlußventils 10 auf das Dehnstoffelement 2 vorgesehen.In order to achieve a direct inflow or flow around the expansion element 2 in each thermostatic valve 1 according to FIGS. 1 to 4, an additional device for directing an increased effectiveness of the coolant flow of the inner coolant circulation downstream of the short-circuit valve 10, which is in an open position, onto the expansion element 2 provided.

Bei dem in Figur 1 gezeigten Thermostatventil 1 mit dem an der Mündung 12 des Zulaufkanals 11 der Kurzschlußleitung 11' den Strömungsquerschnitt steuernden, tellerartigen Kurzschlußventil 10 ist erfindungsgemäß der Mündung 12 des Zulaufskanals 11 eine das Kurzschlußventil 10 umschließende Düse 13 als Zusatzvorrichtung mit einer auf das Dehnstoffelement 2 gerichteten Ausströmöffnung 14 als Strömungslenkvorrichtung zugeordnet.In the thermostatic valve 1 shown in FIG. 1 with the plate-like short-circuit valve 10 controlling the flow cross-section at the mouth 12 of the inlet channel 11 of the short-circuit line 11 ', according to the invention the mouth 12 of the inlet channel 11 is a nozzle 13 enclosing the short-circuit valve 10 as an additional device with an on the expansion element 2 directed outflow opening 14 assigned as a flow control device.

Bei dem in Figur 2 dargestellten Thermostatventil 1 ist erfindungsgemäß als Zusatzvorrichtung ein den Zulaufkanal 11 der Kurzschlußleitung 11' druckbeaufschlagt elastisch nachgiebig geführt freigebendes Drosselventil 16 mit Drosselöffnungen 15 vorgesehen, wobei dem auf dem Fortsatz 9 gleitbeweglich geführten Drosselventil 16 dehnstoffelementseitig eine das Kurzschlußventil 10 umschließende Düse 17 als weiteres Teil der Zusatzvorrichtung mit einer auf das Dehnstoffelement 2 gerichteten Austrittsöffnung 18 zugeordnet ist. Die Drosselöffnungen 15 in dem bekanntermaßen als Warmlaufventil dienenenden Drosselventil 16 sind ab einem vorbestimmten Öffnungshub des Hauptventils 3 durch das tellerartig gestaltete Kurzschlußventil 10 verschließbar.In the thermostatic valve 1 shown in FIG. 2, according to the invention, a throttle valve 16 with throttle openings 15, which releases the supply duct 11 of the short-circuit line 11 'under elastic pressure, is provided as an additional device, the throttle valve 16 slidingly guided on the extension 9 having a nozzle 17 surrounding the short-circuit valve 10 on the expansion element side is assigned as a further part of the additional device with an outlet opening 18 directed towards the expansion element 2. The throttle openings 15 in the throttle valve 16, which is known to serve as a warm-up valve, can be closed by the plate-like short-circuit valve 10 from a predetermined opening stroke of the main valve 3.

Auch bei den Thermostatventilen 1 der Figuren 3 und 4 bilden jeweils Drosselöffnungen 19 in einem den Zulaufkanal 11 der Kurzschlußleitung 11' druckbeaufschlagt freigebenden Drosselventil 20 als jeweilige Zusatzvorrichtung den jeweiligen Strömungsquerschnitt, wobei das jeweilige Kurzschlußventil 10 jedes Thermostatventils 1 auf das Dehnstoffelement 2 gerichtete Druchbrechungen 21 derart angeordnet aufweist, daß jedes Kurzschlußventil ab einem vorbestimmten Öffnungshub des Hauptventils 3 die Drosselöffnungen 19 jedes zusätzlich als Warmlaufventil wirkenden Drosselventils 20 verschließt.Also in the case of the thermostatic valves 1 of FIGS. 3 and 4, throttle openings 19 in a throttle valve 20 which releases the inlet channel 11 of the short-circuit line 11 'as a respective additional device form the respective flow cross-section, the respective short-circuit valve 10 of each thermostatic valve 1 directed toward the expansion element 2 in such a way arranged that each short-circuit valve closes the throttle openings 19 of each throttle valve 20 additionally acting as a warm-up valve from a predetermined opening stroke of the main valve 3.

Gemäß den Figuren 3 und 4 ist jedes Thermostatventil 1 erfindungsgemäß mit einem topfartig gestalteten Drosselventil 20 als Zusatzvorrichtung ausgerüstet, wobei jedes Drosselventil 20 in einem der Topfwandung 22 benachbarten Bodenbereich 23 angeorndete Drosselöffnungen 19 aufweist.According to FIGS. 3 and 4, each thermostatic valve 1 is equipped according to the invention with a pot-shaped throttle valve 20 as an additional device, each throttle valve 20 having throttle openings 19 arranged in a bottom region 23 adjacent to the pot wall 22.

Bei dem Thermostatventil 1 nach Figur 3 weist das erfindungsgemäß als Tellerventil gestaltete, mit relativ kleinem Umfangspiel zur Topfwandung 22 geführt angeordnete Kurschlußventil 10 die vorgesehenen Durchbrechungen 21 eng benachbart einer konzentrisch angeordneten Führungsbuchse 24 auf. Die nahe der Führungsbuchse 24, die der kippfreien gleitbeweglichen Anordnung des Kurzschlußventils 10 auf dem Fortsatz 9 dient, angeordneten Durchbrechungen 21 von entsprechendem Querschnitt sind auf diese Weise von den nahe der Topfwandung 22 vorgesehenen Drosselöffnungen 19 von entsprechendem Strömungsquerschnitt ausreichend radial beabstandet, so daß das Kurzschlußventil 10 stirnseitig mit einem äußeren Ringbereich die Drosselöffnungen 19 sicher verschließt, wie dies das mit strichlierten Linien dargestellte Kurzschlußventil 10 in Schließstellung veranschaulicht.In the thermostatic valve 1 according to FIG. 3, the short-circuit valve 10, designed according to the invention as a poppet valve and guided to the pot wall 22 with a relatively small circumferential clearance, has the openings 21 provided close to a concentrically arranged guide bush 24. The openings 21 of appropriate cross-section arranged near the guide bushing 24, which serves for the tilt-free sliding arrangement of the short-circuit valve 10 on the extension 9, are in this way sufficiently radially spaced from the throttle openings 19 provided near the cup wall 22, so that the short-circuit valve 10 securely closes the throttle openings 19 at the end with an outer ring region, as illustrated by the short-circuit valve 10 shown in dashed lines in the closed position.

Gegenüber dem Thermostatventil 1 der Figur 3 umfaßt beim Thermostatventil 1 der Figur 4 das Kurzschlußventil 10 einen mit relativ keinem Umfangsspiel zur Topfwandung 22 geführten Dichtring 25, der mit einer zentrisch angeordneten Führungsbuchse 26 über einen Kegelabschnitt 27 in Verbindung steht, der in vorteilhafter Weise die wirksame Strömung zu im Übergangsbereich von Kegelabschnitt 27 und Führungsbuchse 26 angeordneten Durchbrechungen 21 lenkt.Compared to the thermostatic valve 1 of Figure 3, in the thermostatic valve 1 of Figure 4, the short-circuit valve 10 comprises a sealing ring 25 which leads to the pot wall 22 with relatively no circumferential play and which is connected to a centrally arranged guide bushing 26 via a cone section 27, which advantageously has the effective effect Flow directs to openings 21 arranged in the transition region from the conical section 27 and the guide bush 26.

Die erfindungsgemäß verbesserte direkte An- bzw. Umströmung des Dehnstoffelementes 2 im Kurzschlußbetrieb bzw. bei innerem Kühlmittelumlauf mit über eine gedrosselte Strömung gesteigerter Kühlmitteltemperatur ist vorteilhaft anwendbar bei einem Thermostaten 1 zur kennfeldgesteuerten Kühlung, wofür das Dehnstoffelement 2 zusätzlich mit einer elektrischen Heizeinrichtung 31 ausgerüstet ist. Diese kann aufgrund der erfindungsgemäß in der Wirksamkeit gesteigerten An- bzw. Umspülung des Dehnstoffelementes vorteilhaft energiesparend betrieben werden.The improved direct inflow or flow around the expansion element 2 in short-circuit operation or in the case of internal coolant circulation with a coolant temperature increased by means of a throttled flow can advantageously be used with a thermostat 1 for map-controlled cooling, for which the expansion element 2 is additionally equipped with an electric heating device 31. This can advantageously be operated in an energy-saving manner due to the fact that the expansion or rinsing of the expansion element increases the effectiveness according to the invention.

Eine bevorzugt einfache Ausgestaltung einer erfindungsgemäß aus einem Drosselventil 28 und einem Kurzschlußventil 10 gebildeten Zusatzvorrichtung zeigt Figur 5, wobei beide Ventile 10, 28 jeweils tellerartig gestaltet sind. Die beispielsweise auf einem Gehäusefortsatz 29 eines in bekannter Weise über den Steuerstift maschinenseitig abgestützten Dehnstoffelementes schiebebeweglich angeordneten Ventile 10, 28 sind relativ zueinander derart beweglich angeordnet, daß das Drosselventil 28 auf einer am Kurzschlußventil 10 vom Dehnstoffelement abgewandt angeorndeten Führungsbuchse 30 gleitet. Das dem Zulaufkanal 11 zugeordnete Drosselventil 28 weist auf einem kanalwandnahen Teilkreis angeordnete Drosselöffnungen 19 auf, wogegen das Kurzschlußventil 10 demgegenüber radial einwärts nahe der Führungsbuchse 30 angeordnete Durchbrechungen 21 aufweist. Damit ist zur freien Umströmung des Umfangsrandes des Kurzschlußventils 10 über die Durchbrechungen 21 zusätzlich eine gezielte Anströmung des Dehnstoffelementes entlang seines Gehäusefortsatzes 29 erzielt mit dem Vorteil einer schnellen Erwärmung des ein Wachselement beinhaltenden Dehnstoffelementes (nicht gezeigt).FIG. 5 shows a preferably simple embodiment of an additional device formed according to the invention from a throttle valve 28 and a short-circuit valve 10, both valves 10, 28 each being designed in the manner of a plate. The valves 10, 28, for example on a housing extension 29 of an expansion element which is supported in a known manner via the control pin on the machine side, are arranged such that they can move relative to one another in such a way that the throttle valve 28 slides on a guide bush 30 facing away from the expansion element on the short-circuit valve 10. The throttle valve 28 assigned to the inlet duct 11 has throttle openings 19 arranged on a pitch circle near the duct wall, whereas the short-circuit valve 10, in contrast, has openings 21 arranged radially inward near the guide bush 30. In order for free flow around the peripheral edge of the short-circuit valve 10 via the openings 21, a targeted flow against the expansion element along its housing extension 29 is additionally achieved with the advantage of rapid heating of the expansion element (not shown) containing a wax element.

Claims (7)

Thermostatventil für den Kühlkreislauf einer Brennkraftmaschine, - bei dem ein Dehnstoffelement (2) ein Hauptventil (3) eines äußeren Kühlmittelumlaufes regelt, und - über den Öffnungshub des Hauptventiles (3) gesteuert ein Kurzschlußventil (10) einen Strömungsquerschnitt einer Kurzschlußleitung (11') des inneren Kühlmittelumlaufes elastisch nachgiebig geführt verschließt, wobei - das gegebenenfalls mit hubverschließbaren Öffnungen ausgerüstete Kurzschlußventil (10) in Offenstellung zur Lenkung einer wirksamen Kühlmittelströmung des inneren Kühlmittelumlaufes auf das Dehnstoffelement (2) dient, dadurch gekennzeichnet, - daß dem Kurzschlußventil (10) eine Zusatzvorrichtung (13; 16, 17; 21 in 10, 19 in 20; 21 in 10, 19 in 28) zur Wirkungssteigerung der auf das Dehnstoffelement (2) gelenkten Kühlmittel-Strömung zugeordnet ist. Thermostatic valve for the cooling circuit of an internal combustion engine, - In which an expansion element (2) regulates a main valve (3) of an external coolant circulation, and - Controlled via the opening stroke of the main valve (3), a short-circuit valve (10) closes a flow cross section of a short-circuit line (11 ') of the inner coolant circuit in an elastically flexible manner, whereby - The short-circuit valve (10), which is optionally equipped with stroke-closable openings, is used in the open position to direct an effective coolant flow of the inner coolant circulation onto the expansion element (2), characterized, - That the short-circuit valve (10) is associated with an additional device (13; 16, 17; 21 in 10, 19 in 20; 21 in 10, 19 in 28) to increase the effectiveness of the coolant flow directed to the expansion element (2). Thermostatventil nach Anspruch 1, - mit einem an der Mündung (12) eines Zulaufkanals (11) der Kurzschlußleitung (11') den Strömungsquerschnitt steuernden Kurzschlußventil (10), dadurch gekennzeichnet, - daß der Mündung (12) des Zulaufkanals (11) eine das Kurzschlußventil (10) umschließende Düse (13) als Zusatzvorrichtung mit einer auf das Dehnstoffelement (2) gerichteten Ausströmöffnung (14) zugeordnet ist (Figur 1). Thermostatic valve according to claim 1, - With a short-circuit valve (10) controlling the flow cross-section at the mouth (12) of an inlet channel (11) of the short-circuit line (11 '), characterized, - That the mouth (12) of the inlet channel (11) is a short-circuit valve (10) enclosing nozzle (13) as an additional device with an on the expansion element (2) directed outflow opening (14) is assigned (Figure 1). Thermostatventil nach Anspruch 1,
dadurch gekennzeichnet, - daß die Zusatzvorrichtung ein einen Zulaufkanal (11) der Kurzschlußleitung (11') druckbeaufschlagt elastisch nachgiebig geführt freigebenes Drosselventil (16) mit Drosselöffnungen (15) umfaßt, sowie - eine dem Drosselventil (16) dehnstoffelementseitig zugeordnete, das Kurzschlußventil (10) umschließende Düse (17) mit einer auf das Dehnstoffelement (2) gerichteten Austrittsöffnung (18) (Figur 2). Thermostatic valve according to claim 1,
characterized, - That the additional device includes a supply channel (11) of the short-circuit line (11 ') pressurized elastically yielding released throttle valve (16) with throttle openings (15), and - One of the throttle valve (16) on the expansion element side, the short circuit valve (10) enclosing nozzle (17) with an on the expansion element (2) directed outlet opening (18) (Figure 2). Thermostatventil nach Anspruch 1,
dadurch gekennzeichnet, - daß die Zusatzvorrichtung ein einen Zulaufkanal (11) der Kurzschlußleitung (11') druckbeaufschlagt elastisch nachgiebig geführt freigebendes Drosselventil (20, 28) mit Drosselöffnungen (19) sowie - im Kurzschlußventil (10) auf das Dehnstoffelement (2) gerichtete Druchbrechungen (21) derart angeordnet umfaßt, daß - das Kurzschlußventil (10) ab einem vorbestimmten Öffnungshub des Hauptventils (3) die Drosselöffnungen (19) des jeweiligen Drosselventils (20, 28) verschließt (Figuren 3, 4, 5). Thermostatic valve according to claim 1,
characterized, - That the additional device a supply channel (11) of the short-circuit line (11 ') pressurized elastically yielding releasing throttle valve (20, 28) with throttle openings (19) and - In the short-circuit valve (10) on the expansion element (2) directed openings (21) arranged such that - The short-circuit valve (10) closes the throttle openings (19) of the respective throttle valve (20, 28) from a predetermined opening stroke of the main valve (3) (Figures 3, 4, 5). Thermostatventil nach Anspruch 4,
dadurch gekennzeichnet, - daß ein topfartig gestaltetes Drosselventil (20) der Zusatzvorrichtung in einem der Topfwandung (22) benachbarten Bodenbereich (23) angeorndete Drosselöffnungen (19) aufweist, und - daß das als Tellerventil gestaltete, mit relativ kleinem Umfangsspiel zur Topfwandung (22) geführt angeordnete Kurzschlußventil (10) benachbart einer konzentrisch angeordneten Führungsbuchse (24) vorgesehene Durchbrechungen (21) aufweist (Figur 3). Thermostatic valve according to claim 4,
characterized, - That a pot-shaped throttle valve (20) of the additional device in one of the pot wall (22) adjacent bottom region (23) has arranged throttle openings (19), and - That designed as a poppet valve, with a relatively small circumferential clearance to the pot wall (22) arranged short-circuit valve (10) adjacent to a concentrically arranged guide bush (24) provided openings (21) (Figure 3). Thermostatventil nach Anspruch 4,
dadurch gekennzeichnet, daß - daß ein topfartig gestaltetes Drosselventil (20) der Zusatzvorrichtung in einem der Topfwandung (22) benachbarten Bodenbereich (23) angeordnete Drosselöffnungen (19) aufweist, und - daß das Kurzschlußventil (10) einen mit relativ kleinem Umfangsspiel zur Topfwandung (22) geführten Dichtring (25) umfaßt, der - mit einer zentrisch angeordneten Führungsbuchse (26) über einen Kegelabschnitt (27) in Verbindung steht, der - die wirksame Strömung zu im Übergangsbereich von Kegelabschnitt (27) und Führungsbuchse (26) angeordneten Durchbrechungen (21) lenkt. Thermostatic valve according to claim 4,
characterized in that - That a pot-shaped throttle valve (20) of the additional device in one of the pot wall (22) adjacent bottom region (23) has throttle openings (19), and - That the short-circuit valve (10) includes a relatively small circumferential clearance to the pot wall (22) sealing ring (25) - With a centrally arranged guide bush (26) via a cone section (27) in connection - The effective flow directs in the transition region of the conical section (27) and guide bushing (26) arranged openings (21). Thermostatventil nach einem oder mehreren der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß - das Dehnstoffelement (2) mit einer zusätzlichen Heizeinrichtung (31) ausgerüstet ist. Thermostatic valve according to one or more of claims 1 to 6,
characterized in that - The expansion element (2) is equipped with an additional heating device (31).
EP96115636A 1995-10-05 1996-09-30 Thermostatic valve for the cooling circuit of an internal combustion engine Expired - Lifetime EP0767299B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19537068A DE19537068A1 (en) 1995-10-05 1995-10-05 Thermostatic valve for the cooling circuit of an internal combustion engine
DE19537068 1995-10-05

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EP0767299A2 true EP0767299A2 (en) 1997-04-09
EP0767299A3 EP0767299A3 (en) 1998-08-19
EP0767299B1 EP0767299B1 (en) 2003-07-30

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WO2004046516A1 (en) * 2002-11-16 2004-06-03 Daimlerchrysler Ag Thermostatic valve for a cooling system of an internal combustion engine
EP2090763A1 (en) * 2008-02-14 2009-08-19 Peugeot Citroen Automobiles SA Engine cooling circuit

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DE19824422A1 (en) * 1998-05-30 1999-12-02 Bayerische Motoren Werke Ag Thermostat valve for coolant circuit of internal combustion engine

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WO2004046516A1 (en) * 2002-11-16 2004-06-03 Daimlerchrysler Ag Thermostatic valve for a cooling system of an internal combustion engine
US7096831B2 (en) 2002-11-16 2006-08-29 Daimlerchrysler Ag Thermostatic valve for a cooling system of an internal combustion engine
EP2090763A1 (en) * 2008-02-14 2009-08-19 Peugeot Citroen Automobiles SA Engine cooling circuit
FR2927660A1 (en) * 2008-02-14 2009-08-21 Peugeot Citroen Automobiles Sa ENGINE COOLING CIRCUIT

Also Published As

Publication number Publication date
EP0767299A3 (en) 1998-08-19
DE19537068A1 (en) 1997-04-10
EP0767299B1 (en) 2003-07-30
ES2203663T3 (en) 2004-04-16
DE59610625D1 (en) 2003-09-04

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