EP1133623A1 - Cooling circuit - Google Patents

Cooling circuit

Info

Publication number
EP1133623A1
EP1133623A1 EP99956017A EP99956017A EP1133623A1 EP 1133623 A1 EP1133623 A1 EP 1133623A1 EP 99956017 A EP99956017 A EP 99956017A EP 99956017 A EP99956017 A EP 99956017A EP 1133623 A1 EP1133623 A1 EP 1133623A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
cooling circuit
line
radiator
motor
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Withdrawn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
EP99956017A
Other languages
German (de)
French (fr)
Inventor
Roland Altvater
Walter Marte
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP1133623A1 publication Critical patent/EP1133623A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
    • 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
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • 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
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105—Using two or more pumps
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/04—Lubricant cooler
    • F01P2060/045—Lubricant cooler for transmissions
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/06—Retarder
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater

Definitions

  • the present invention relates to a cooling circuit for driving motor vehicles with a discharge line that connects the drive motor to at least one radiator, with a supply line that connects the radiator with the drive motor, with a thermostat inserted into the discharge line, and with one inserted into the supply line Circulation pump.
  • Coolant usually water
  • the coolant flows through the engine under the influence of a circulation pump and then passes through the thermostat, which supplies the coolant at a correspondingly high temperature to a radiator, in which the coolant is cooled by the air entering during the journey or supplied by a fan, after which it is assisted a circulation pump is returned to the engine.
  • the thermostat ensures that the coolant is fed back to the engine without flowing through the radiator.
  • a second radiator can be provided, the fan wheel of which is insufficiently cooled by the first radiator via a thermal Statschalter is switched on, so as to increase the cooling of the coolant.
  • the cooled water flowing through the two radiators is in turn fed to the drive motor to be cooled via the circulation pump.
  • a heat exchanger is often inserted into the cooling circuit before or after the motor. The temperature of the coolant
  • thermostat which regulates the coolant flow to the radiator and a bypass. With this regulation, the excess power loss is fed to the radiator.
  • the thermostat is often only partially open, which reduces the effect of the radiator.
  • the known type of installation of the heat exchanger takes the needs of the engine into account very well, but cannot be designed for the needs of a transmission and / or a retarder.
  • the transmission oil temperatures are permanently stable in transmissions with retarders only above certain temperatures.
  • the object of the present invention is to propose a cooling circuit in which the concerns of the transmission and / or retarder are taken into account in an optimal manner.
  • the proposal according to the invention to install the heat exchanger on the radiator side together with an associated circulating pump allows the coolant flow through the heat exchanger to be increased independently of the engine coolant flow and thus to be adapted to the gearbox requirements.
  • the transmission oil sump temperature can be set largely independently of the engine coolant temperature; this leads to a
  • the transmission loss power (i.e. the radiator power loss), which occurs cyclically or acyclically to the engine speed, can also be dissipated at engine idling speeds;
  • the circulation pump for the engine coolant can be designed for the needs of the engine cooling circuit, which enables a reduction in pump performance and a reduction in consumption;
  • the heat exchanger can be in one favorable operating point can be operated and thereby be designed smaller;
  • the heat exchanger can be integrated into the transmission housing, which saves further costs;
  • the coolant pump of the heat exchanger can act as an additional coolant pump when the thermostat is closed;
  • FIG. 1 shows an inventive cooling circuit of the series design
  • FIG. 2 shows a cooling circuit according to the invention of the design in parallel
  • Figure 3 shows an inventive cooling circuit of the series version.
  • FIG. 4 shows a cooling circuit according to the invention of an embodiment with a bypass.
  • 1 denotes the drive motor of a motor vehicle to be cooled, the power loss of which is designated Pvmot.
  • the discharge line of the motor is designated 3 and the usual thermostat 4, which supplies the coolant, generally water, heated to a corresponding temperature to a first cooler 6, from which it is supplied to the motor via the supply line 8 with the aid of a circulation pump 2 1 is fed back in a closed circuit.
  • the coolant generally water
  • the gear assigned to the motor is also designated 14, the power loss of which is designated P vge t, the converter, not shown, often assigned to the gear having a power loss of P VW and; 15 denotes the retarder assigned to the transmission, the power loss of which is designated P V retar is.
  • Transmission 14 and retarder 15 are also cooled by a coolant, the heated coolant, preferably oil, being fed in line 16 to a heat exchanger 10, which is used on the radiator side in the cooling circuit for the drive motor and which is used on the one hand by the Feed line 8 for the engine is penetrated and on the other hand by the discharge line 16 for gearbox and retarder.
  • the coolant for the gearbox and retarder emerging from the heat exchanger 10 flows through a line 12 and is returned to the gearbox 14 and the retarder 15 with the aid of a circulation pump 13.
  • a circulation pump 11 is provided behind the heat exchanger 10, viewed in the direction of flow, which flows into a connecting line
  • the heat exchanger is therefore arranged in front of the engine and on the one hand is penetrated by the supply line 8 for the engine, in which the coolant cooled by the radiator 6, possibly with the radiator 7 connected, flows in the direction of the engine 1.
  • the heat exchanger 10 is penetrated by the line 16, in which the coolant heated by the transmission and retarder flows.
  • the heat exchanger 10 is in turn penetrated on the one hand by the line 16 in which the coolant heated by the transmission 14 and by the retarder 15 flows; here, however, the heat exchanger 10 is used together with the circulation pump 11 in the connecting line 8 'between the feed line 8 to the drive motor and its discharge line 3.
  • the heat exchanger is also inserted in the cooling circuit before the drive motor.
  • the circulation pump 11 is here between the radiator 6 and the circulation pump 2 for the motor 1, i. H. used in the flow direction upstream of the heat exchanger in the supply line 8.
  • the heat exchanger 10 is penetrated by the transmission line 16 or retarder 15 through the discharge line 16.
  • the circulation pump 11 is omitted compared to FIG. 3.
  • the thermostat 4 can be bypassed with a bypass 20.
  • the coolant flow through the heat exchanger can be increased independently of the engine coolant flow; this type of cooling circuit is particularly suitable for commercial vehicles such as buses.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

The invention relates to a cooling circuit for the drive system of motor vehicles, notably buses, which comprises an exhaust line which connects the drive motor with at least one radiator, a supply line which connects the radiator to the drive motor, a thermostat positioned in the exhaust line and a circulating pump positioned in the supply line. On the radiator (6) side a heat exchanger (10) is provided for to which a circulating pump (11) is assigned. The heat exchanger is traversed on the one hand by the supply line (8, 8') for the motor (1) and on the other hand by a line (16) connected to the transmission (14) and possibly to the radiator (15) of the drive system.

Description

Kühlkreislauf Cooling circuit
Die vorliegende Erfindung betrifft einen Kühlkreislauf für den Antrieb von Kraftfahrzeugen mit einer Abfuhrleitung, die den Antriebsmotor mit mindestens einem Radiator verbindet, mit einer Zufuhrleitung, die den Radiator mit dem Antriebsmotor verbindet, mit einem in die Abfuhrleitung eingesetzten Thermostaten und mit einer in die Zufuhrleitung eingesetzten Umwälzpumpe.The present invention relates to a cooling circuit for driving motor vehicles with a discharge line that connects the drive motor to at least one radiator, with a supply line that connects the radiator with the drive motor, with a thermostat inserted into the discharge line, and with one inserted into the supply line Circulation pump.
Mit Verbrennungsmotoren betriebene Kraftfahrzeuge weisen üblicherweise einen mit Kühlmittel, üblicherweise Wasser, arbeitenden Kühlkreislauf auf, um den Antriebsmotor auf seine optimale Temperatur in der Grössenordnung von 85 °C zu halten. Das Kühlmittel durchfliesst unter dem Einfluss einer Umwälzpumpe den Motor und durchsetzt danach den Thermostaten, der das Kühlmittel bei entsprechend hoher Temperatur einem Radiator zuführt, in dem das Kühlmittel durch die während der Fahrt eindringende oder durch einen Lüfter zugeführte Luft abgekühlt wird, wonach es mit Hilfe einer Umwälzpumpe wieder zum Motor zurückgeführt wird. Solange das Kühlmittel unter einer vorgegebenen Temperatur liegt, sorgt der Thermostat dafür, dass das Kühlmittel ohne Durch- fliessen des Radiators unmittelbar dem Motor wieder zugeführt wird.Motor vehicles operated with internal combustion engines usually have a cooling circuit working with coolant, usually water, in order to keep the drive motor at its optimum temperature in the order of magnitude of 85.degree. The coolant flows through the engine under the influence of a circulation pump and then passes through the thermostat, which supplies the coolant at a correspondingly high temperature to a radiator, in which the coolant is cooled by the air entering during the journey or supplied by a fan, after which it is assisted a circulation pump is returned to the engine. As long as the coolant is below a predetermined temperature, the thermostat ensures that the coolant is fed back to the engine without flowing through the radiator.
Für besonders hohe Belastungen, z. B. bei einer Bergauffahrt mit geringer Geschwindigkeit, kann ein zweiter Radia- tor vorgesehen sein, dessen Lüfterrad bei nicht ausreichender Kühlung durch den ersten Radiator über einen Thermo- statschalter zugeschaltet wird, um so die Abkühlung des Kühlmittels zu verstärken. Das die beiden Radiatoren durch- fliessende abgekühlte Wasser wird über die Umwälzpumpe wiederum dem zu kühlenden Antriebsmotor zugeführt.For particularly high loads, e.g. B. when driving uphill at low speed, a second radiator can be provided, the fan wheel of which is insufficiently cooled by the first radiator via a thermal Statschalter is switched on, so as to increase the cooling of the coolant. The cooled water flowing through the two radiators is in turn fed to the drive motor to be cooled via the circulation pump.
Bei Antriebsmotoren mit Getrieben oder anderen Komponenten mit Verlustleistungen, deren Verlustleistung als Wärme über den Kühlkreislauf für den Antrieb abgeführt wird, wird oftmals ein Wärmetauscher vor oder nach dem Motor in den Kühl- kreislauf eingesetzt. Die Temperatur des Kühlmittels desIn drive motors with gearboxes or other components with power losses, the power loss of which is dissipated as heat via the cooling circuit for the drive, a heat exchanger is often inserted into the cooling circuit before or after the motor. The temperature of the coolant
Motors wird dabei durch den Thermostaten, der den Kühlmittelstrom zum Radiator und einen Bypass regelt, stabilisiert. Bei dieser Regelung wird die überschüssige Verlustleistung dem Radiator zugeführt.Motors is stabilized by the thermostat, which regulates the coolant flow to the radiator and a bypass. With this regulation, the excess power loss is fed to the radiator.
Oftmals ist der Thermostat nur teilweise geöffnet, wodurch die Wirkung des Radiators verringert wird. Die bekannte Einbauart des Wärmetauschers berücksichtigt die Belange des Motors bestens, kann jedoch nicht auf die Belange eines Getriebes und/oder eines Retarders ausgelegt werden. Die Getriebeöltemperaturen sind bei Getrieben mit Retardern erst oberhalb bestimmter Temperaturen dauerstabil.The thermostat is often only partially open, which reduces the effect of the radiator. The known type of installation of the heat exchanger takes the needs of the engine into account very well, but cannot be designed for the needs of a transmission and / or a retarder. The transmission oil temperatures are permanently stable in transmissions with retarders only above certain temperatures.
Aufgabe der vorliegenden Erfindung ist es, einen Kühlkreis- lauf vorzuschlagen, bei dem die Belange des Getriebes und/oder Retarders in optimaler Weise berücksichtigt werden.The object of the present invention is to propose a cooling circuit in which the concerns of the transmission and / or retarder are taken into account in an optimal manner.
Ausgehend von einem Kühlkreislauf der eingangs näher ge- nannten Art erfolgt die Lösung dieser Aufgabe mit den im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmalen; vorteilhafte Ausgestaltungen sind in den Unteransprüchen beschrieben.Starting from a cooling circuit of the type specified in the introduction, this object is achieved with the features specified in the characterizing part of claim 1; advantageous embodiments are described in the subclaims.
Durch den erfindungsgemässen Vorschlag, den Wärmetauscher auf der Radiatorseite zusammen mit einer zugeordneten Umwälzpumpe einzubauen, lässt sich der Kühlmittelstrom durch den Wärmetauscher unabhängig vom Motorkühlmittelstrom ver- grössern und dadurch an die Getriebebelange anpassen.The proposal according to the invention to install the heat exchanger on the radiator side together with an associated circulating pump allows the coolant flow through the heat exchanger to be increased independently of the engine coolant flow and thus to be adapted to the gearbox requirements.
Die Erfindung bietet insbesondere folgende Vorteile:The invention offers the following advantages in particular:
Die Getriebeölsumpftemperatur kann weitgehend unabhängig von der Motorkühlmitteltemperatur eingestellt werden; dies führt zu einerThe transmission oil sump temperature can be set largely independently of the engine coolant temperature; this leads to a
- Verringerung des Kraftstoffverbrauches durch erhöhte Motorkühlmitteltemperatur- Reduction of fuel consumption through increased engine coolant temperature
- Verringerung von Schadstoffen durch eine konstantere Motorkühlmitteltemperatur - Verkleinerung des Radiators durch eine höhere- Reduction of pollutants by a more constant engine coolant temperature - Reduction of the radiator by a higher
Motorkühlmitteltemperatur und dadurch Kosteneinsparung;Engine coolant temperature and thereby cost savings;
- die Getriebeverlustleistung (d. h. die Radiatorverlustleistung) , die zyklisch oder azyklisch zur Motordrehzahl auftritt, kann auch bei Motorleerlaufdrehzahlen abgeführt werden;- The transmission loss power (i.e. the radiator power loss), which occurs cyclically or acyclically to the engine speed, can also be dissipated at engine idling speeds;
- die Umwälzpumpe für das Motorkühlmittel kann auf die Belange des Motorkühlkreislaufes ausgelegt werden, wodurch eine Verringerung der Pumpenleistung und eine Verbrauchsreduktion ermöglicht wird; - durch den vom Getriebe aus steuerbaren Kühlmittelstrom durch den Wärmetauscher kann der Wärmetauscher in einem günstigen Betriebspunkt betrieben werden und dadurch kleiner ausgelegt werden;- The circulation pump for the engine coolant can be designed for the needs of the engine cooling circuit, which enables a reduction in pump performance and a reduction in consumption; - By the coolant flow controllable from the transmission through the heat exchanger, the heat exchanger can be in one favorable operating point can be operated and thereby be designed smaller;
- bei entsprechenden Kühlmittelströmen kann der Wärmetauscher in das Getriebegehäuse integriert werden, wodurch weitere Kosten eingespart werden;- With appropriate coolant flows, the heat exchanger can be integrated into the transmission housing, which saves further costs;
- auch im Leerlauf können grosse Wärmeleistungen aus dem Getriebe abgeführt werden;- Large heat outputs can be dissipated from the transmission even when idling;
- in der Ausführungsform Serie/Bypass kann die Kühlmittelpumpe des Wärmetauschers bei geschlossenem Thermostat als zusätzliche Kühlmittelpumpe wirken;- In the series / bypass embodiment, the coolant pump of the heat exchanger can act as an additional coolant pump when the thermostat is closed;
- diese Redundanz der Kühlmittelpumpen erhöht die Systemzuverlässigkeit insgesamt und die Spitzenleistung des Kühlsystems (so kühlt der Motor im Leerlauf nach Bergfahrten schneller ab) .- This redundancy of the coolant pumps increases the overall system reliability and the peak performance of the cooling system (this way, the engine cools down more quickly after driving uphill).
Im folgenden wird die Erfindung anhand der Zeichnung näher erläutert, in der vorteilhafte Ausführungsbeispiele dargestellt sind. Es zeigenThe invention is explained in more detail below with reference to the drawing, in which advantageous exemplary embodiments are shown. Show it
Figur 1 einen erfindungsgemässen Kühlkreislauf der Ausführung Serie,FIG. 1 shows an inventive cooling circuit of the series design,
Figur 2 einen erfindungsgemässen Kühlkreislauf der Ausführung parallel, undFigure 2 shows a cooling circuit according to the invention of the design in parallel, and
Figur 3 einen erfindungsgemässen Kühlkreislauf der Ausführung Serie.Figure 3 shows an inventive cooling circuit of the series version.
Figur 4 einen erfindungsgemäßen Kühlkreislauf einer Ausfüh- rung mit Bypass. In den Figuren sind gleiche Teile mit gleichen Bezugszeichen versehen. So bezeichnet 1 den zu kühlenden Antriebsmotor eines Kraftfahrzeuges, dessen Verlustleistung mit Pvmot bezeichnet ist. Die Abfuhrleitung des Motors ist mit 3 be- zeichnet und der übliche Thermostat mit 4, der das auf eine entsprechende Temperatur erhitzte Kühlmittel, im allgemeinen Wasser, einem ersten Kühler 6 zuführt, von dem es über die Zufuhrleitung 8 mit Hilfe einer Umwälzpumpe 2 dem Motor 1 im geschlossenen Kreislauf wieder zugeführt wird. Bis der Motor 1 seine Betriebstemperatur erreicht hat, sorgt derFIG. 4 shows a cooling circuit according to the invention of an embodiment with a bypass. In the figures, the same parts are provided with the same reference symbols. 1 denotes the drive motor of a motor vehicle to be cooled, the power loss of which is designated Pvmot. The discharge line of the motor is designated 3 and the usual thermostat 4, which supplies the coolant, generally water, heated to a corresponding temperature to a first cooler 6, from which it is supplied to the motor via the supply line 8 with the aid of a circulation pump 2 1 is fed back in a closed circuit. Until the engine 1 has reached its operating temperature, the
Thermostat dafür, dass das noch nicht ausreichend erwärmte Kühlmittel dem Motor über die Leitung 20 wieder zugeführt wird, ohne dass es den Radiator 6 durchsetzt.Thermostat for the fact that the coolant, which has not yet been sufficiently heated, is fed back to the engine via line 20 without passing through the radiator 6.
Mit 5 ist in den Figuren ferner ein Thermostatschalter für die Zuschaltung eines zweiten Radiators 7 bezeichnet, der für den Fall vorgesehen ist, dass die Kühlleistung des ersten Radiators 6 nicht ausreicht.5 in the figures also designates a thermostat switch for connecting a second radiator 7, which is provided in the event that the cooling capacity of the first radiator 6 is insufficient.
Mit 17 ist die übliche Heizung für das Kraftfahrzeug bezeichnet, die von einer parallel zur Abfuhrleitung 3 verlaufenden Heizleitung 19 und einer Umwälzpumpe 18 gespeist wird. Mit 9, 9' , 9' ' sind Rückschlagventile in den einzelnen Kühlmittelleitungen bezeichnet.With 17 the usual heating for the motor vehicle is designated, which is fed by a heating line 19 running parallel to the discharge line 3 and a circulation pump 18. With 9, 9 ', 9' 'check valves in the individual coolant lines are designated.
In den Figuren ist ferner das dem Motor zugeordnete Getriebe mit 14 bezeichnet, dessen Verlustleistung mit Pvget bezeichnet ist, wobei der nicht dargestellte, oftmals dem Getriebe zugeordnete Wandler eine Verlustleistung von PVWand aufweist; mit 15 ist der dem Getriebe zugeordnete Retarder bezeichnet, dessen Verlustleistung mit PVretar bezeichnet ist. Getriebe 14 und Retarder 15 werden ebenfalls durch ein Kühlmittel gekühlt, wobei das erwärmte Kühlmittel, vorzugsweise Öl, in der Leitung 16 einem Wärmetauscher 10 zugeführt wird, der auf Seiten des Radiators in den Kühlkreis- lauf für den Antriebsmotor eingesetzt ist und der einerseits von der Zufuhrleitung 8 für den Motor durchsetzt wird und andererseits von der Abfuhrleitung 16 für Getriebe und Retarder. Das aus dem Wärmetauscher 10 austretende Kühlmittel für Getriebe und Retarder durchströmt eine Leitung 12 und wird mit Hilfe einer Umwälzpumpe 13 dem Getriebe 14 und dem Retarder 15 wieder zugeführt.In the figures, the gear assigned to the motor is also designated 14, the power loss of which is designated P vge t, the converter, not shown, often assigned to the gear having a power loss of P VW and; 15 denotes the retarder assigned to the transmission, the power loss of which is designated P V retar is. Transmission 14 and retarder 15 are also cooled by a coolant, the heated coolant, preferably oil, being fed in line 16 to a heat exchanger 10, which is used on the radiator side in the cooling circuit for the drive motor and which is used on the one hand by the Feed line 8 for the engine is penetrated and on the other hand by the discharge line 16 for gearbox and retarder. The coolant for the gearbox and retarder emerging from the heat exchanger 10 flows through a line 12 and is returned to the gearbox 14 and the retarder 15 with the aid of a circulation pump 13.
Wie Figur 1 erkennen lässt, ist in Strömungsrichtung gesehen, hinter dem Wärmetauscher 10 eine diesem zugeordnete Umwälzpumpe 11 vorgesehen, die in eine VerbindungsleitungAs can be seen in FIG. 1, a circulation pump 11 is provided behind the heat exchanger 10, viewed in the direction of flow, which flows into a connecting line
8' eingesetzt ist, zusammen mit einem Rückschlagventil 9'', wobei diese Verbindungsleitung 8' die Zufuhrleitung 8 für den Antriebsmotor mit dessen Abfuhrleitung 3 verbindet. Bei dieser Ausführungsform Serie ist also der Wärmetauscher vor dem Motor angeordnet und wird einerseits von der Zufuhrleitung 8 für den Motor durchsetzt, in der das durch den Radiator 6 gegebenenfalls unter Zuschaltung des Radiators 7 abgekühlte Kühlmittel in Richtung Motor 1 fliesst. Andererseits wird der Wärmetauscher 10 von der Leitung 16, in der das vom Getriebe und Retarder erhitzte Kühlmittel fliesst, durchsetzt.8 'is used, together with a check valve 9' ', this connecting line 8' connecting the supply line 8 for the drive motor with its discharge line 3. In this series embodiment, the heat exchanger is therefore arranged in front of the engine and on the one hand is penetrated by the supply line 8 for the engine, in which the coolant cooled by the radiator 6, possibly with the radiator 7 connected, flows in the direction of the engine 1. On the other hand, the heat exchanger 10 is penetrated by the line 16, in which the coolant heated by the transmission and retarder flows.
Bei dem in Figur 2 dargestellten Ausführungsbeispiel einer Ausführungsform parallel wird der Wärmetauscher 10 wiederum einerseits von der Leitung 16 durchsetzt, in welcher das vom Getriebe 14 und vom Retarder 15 erhitzte Kühlmittel fliesst; hierbei ist jedoch der Wärmetauscher 10 zusammen mit der Umwälzpumpe 11 in der Verbindungsleitung 8' zwischen der Zufuhrleitung 8 zum Antriebsmotor und dessen Abfuhrleitung 3 eingesetzt.In the exemplary embodiment of an embodiment shown in parallel in FIG. 2, the heat exchanger 10 is in turn penetrated on the one hand by the line 16 in which the coolant heated by the transmission 14 and by the retarder 15 flows; here, however, the heat exchanger 10 is used together with the circulation pump 11 in the connecting line 8 'between the feed line 8 to the drive motor and its discharge line 3.
Auch bei der in Figur 3 schematisch dargestellten Ausführungsform Serie ist der Wärmetauscher vor dem Antriebsmotor in den Kühlkreislauf eingesetzt. Die Umwälzpumpe 11 ist hierbei zwischen dem Radiator 6 und der Umwälzpumpe 2 für den Motor 1, d. h. in Strömungsrichtung vor dem Wärmetauscher in die Zufuhrleitung 8 eingesetzt. Wie bei den bisherigen Ausführungsbeispielen wird auch hier der Wärmetauscher 10 andererseits durch die Abfuhrleitung 16 vom Getriebe 14 bzw. Retarder 15 durchsetzt.In the embodiment shown schematically in FIG. 3, the heat exchanger is also inserted in the cooling circuit before the drive motor. The circulation pump 11 is here between the radiator 6 and the circulation pump 2 for the motor 1, i. H. used in the flow direction upstream of the heat exchanger in the supply line 8. As in the previous exemplary embodiments, the heat exchanger 10, on the other hand, is penetrated by the transmission line 16 or retarder 15 through the discharge line 16.
Bei der Figur 4 dargestellten Ausführungsform entfällt gegenüber Figur 3 die Umwälzpumpe 11. Der Thermostat 4 kann jedoch in der gezeigten Ausführungsform mit einem Bypass 20 umgangen werden.In the embodiment shown in FIG. 4, the circulation pump 11 is omitted compared to FIG. 3. In the embodiment shown, the thermostat 4 can be bypassed with a bypass 20.
Durch den Einbau des Wärmetauschers zusammen mit einer Umwälzpumpe auf der Radiatorseite lässt sich also der Kühlmittelstrom durch den Wärmetauscher unabhängig vom Motorkühlmittelstrom vergrössern; diese Art von Kühlkreislauf eignet sich insbesondere für Nutzfahrzeuge wie Omnibusse.By installing the heat exchanger together with a circulation pump on the radiator side, the coolant flow through the heat exchanger can be increased independently of the engine coolant flow; this type of cooling circuit is particularly suitable for commercial vehicles such as buses.
Es lassen sich im Kühlkreislauf unterschiedliche Temperaturniveaus erreichen; hohe Temperatur für den Motor, niedrige Temperatur für das Getriebe. Es läßt sich eine sehr kostengünstige Anordnung erreichen, die auch an ein Fahrzeug nachrüstbar ist. BezugszeichenlisteDifferent temperature levels can be reached in the cooling circuit; high temperature for the engine, low temperature for the transmission. A very inexpensive arrangement can be achieved which can also be retrofitted to a vehicle. Reference list
I Motor 2 UmwälzpumpeI Motor 2 circulation pump
3 Abfuhrleitung3 discharge line
4 Thermostat4 thermostat
5 Thermostatschalter5 thermostat switches
6 Radiator 7 Radiator6 radiator 7 radiator
8, 8' Zufuhrleitung8, 8 'supply line
9, 9', 9'' Rückschlagventile 10 Wärmetauscher9, 9 ', 9' 'check valves 10 heat exchangers
II Umwälzpumpe 12 LeitungII Circulation pump 12 line
13 Umwälzpumpe13 circulation pump
14 Getriebe14 gears
15 Retarder15 retarders
16 Leitung 17 Heizung16 Line 17 heating
18 Umwälzpumpe18 circulation pump
19 Leitung19 management
20 Bypass 20 bypass

Claims

Patentansprüche claims
1. Kühlkreislauf für den Antrieb von Kraftfahrzeugen, mit einer Abfuhrleitung, die den Antriebsmotor mit mindestens einem Radiator verbindet, mit einer Zufuhrleitung, die den Radiator mit dem Antriebsmotor verbindet, mit einem in die Abfuhrleitung eingesetzten Thermostaten und mit einer in die Zufuhrleitung eingesetzten Umwälzpumpe, dadurch gekennzeichnet, dass auf der Seite des Radiators (6) und vor dem Motor (1) ein Wärmetauscher (10) vorgesehen ist, der einerseits von der Zufuhrleitung (8, 8') für den Motor (1) durchsetzt wird und anderseits von einer mit dem Getriebe (14) und ggf. dem Retarder (15) des Antriebs verbundenen Leitung (16) durchsetzt wird, die ihm das vom Getriebe und ggf. vom Retarder erhitzte Kühlmittel zuführt.1.cooling circuit for driving motor vehicles, with a discharge line that connects the drive motor to at least one radiator, with a supply line that connects the radiator with the drive motor, with a thermostat inserted into the discharge line and with a circulation pump inserted into the supply line, characterized in that on the side of the radiator (6) and in front of the motor (1) a heat exchanger (10) is provided which is penetrated on the one hand by the supply line (8, 8 ') for the motor (1) and on the other hand by one with the gear (14) and possibly the retarder (15) of the drive connected line (16) is passed through, which feeds him the coolant heated by the gear and possibly by the retarder.
2. Kühlkreislauf nach Anspruch 1, dadurch gekennzeichnet, daß dem Wärmetauscher (10) eine zweite Umwälzpumpe (11) zugeordnet ist.2. Cooling circuit according to claim 1, characterized in that the heat exchanger (10) is assigned a second circulating pump (11).
3. Kühlkreislauf nach Anspruch 1, dadurch gekennzeich- net, daß dem Wärmetauscher (10) ein Bypass (20) zugeordnet ist.3. Cooling circuit according to claim 1, characterized in that the heat exchanger (10) is assigned a bypass (20).
4. Kühlkreislauf nach Anspruch 2, dadurch gekennzeichnet, dass die dem Wärmetauscher (10) zugeordnete Um- wälzpumpe (11) in Strömungsrichtung gesehen, vor dem Wärmetauscher in der Zufuhrleitung (8) angeordnet ist ,4. Cooling circuit according to claim 2, characterized in that the circulating pump (11) assigned to the heat exchanger (10), viewed in the flow direction, is arranged in front of the heat exchanger in the feed line (8) is
5. Kühlkreislauf nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen der Zu- fuhrleitung (8) für den Motor (1) und der Abfuhrleitung (3) für den Motor (1) eine Verbindungsleitung (8') vorgesehen ist.5. Cooling circuit according to one of the preceding claims, characterized in that a connecting line (8 ') is provided between the supply line (8) for the motor (1) and the discharge line (3) for the motor (1).
6. Kühlkreislauf nach Anspruch 5, dadurch gekennzeich- net, dass die Umwälzpumpe (11) in die Verbindungsleitung (8') eingesetzt ist.6. Cooling circuit according to claim 5, characterized in that the circulating pump (11) is inserted into the connecting line (8 ').
7. Kühlkreislauf nach Anspruch 6, dadurch gekennzeichnet, dass der Wärmetauscher (10) von der Verbindungs- leitung (8') durchsetzt wird. 7. Cooling circuit according to claim 6, characterized in that the heat exchanger (10) is penetrated by the connecting line (8 ').
EP99956017A 1998-11-25 1999-11-19 Cooling circuit Withdrawn EP1133623A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19854389A DE19854389A1 (en) 1998-11-25 1998-11-25 Cooling circuit
DE19854389 1998-11-25
PCT/EP1999/008881 WO2000031387A1 (en) 1998-11-25 1999-11-19 Cooling circuit

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EP1133623A1 true EP1133623A1 (en) 2001-09-19

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DE (1) DE19854389A1 (en)
HU (1) HUP0104063A3 (en)
WO (1) WO2000031387A1 (en)

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DE19854389A1 (en) 2000-05-31
HUP0104063A3 (en) 2002-03-28
HUP0104063A2 (en) 2002-02-28
WO2000031387A1 (en) 2000-06-02

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