WO2022069290A1 - Braking system for coupling to a drive train - Google Patents

Braking system for coupling to a drive train Download PDF

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Publication number
WO2022069290A1
WO2022069290A1 PCT/EP2021/075898 EP2021075898W WO2022069290A1 WO 2022069290 A1 WO2022069290 A1 WO 2022069290A1 EP 2021075898 W EP2021075898 W EP 2021075898W WO 2022069290 A1 WO2022069290 A1 WO 2022069290A1
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WO
WIPO (PCT)
Prior art keywords
working medium
retarder
bypass
working
medium circuit
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Application number
PCT/EP2021/075898
Other languages
German (de)
French (fr)
Inventor
Dieter Laukemann
Alexander Schreiber
Original Assignee
Voith Patent Gmbh
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Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2022069290A1 publication Critical patent/WO2022069290A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
    • B60T10/02—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope with hydrodynamic brake

Definitions

  • Braking system for coupling to a drive train
  • the invention relates to a brake system for coupling to a drive train.
  • the braking system includes a retarder, a closed working medium circuit with a cooler, a pressure equalizing tank and valves that can be controlled in such a way that the working medium volume in the retarder and thus the braking torque of the retarder can be regulated.
  • a mechanical seal is provided between the retarder shaft, on which a rotor and a pump are coupled in a rotationally fixed manner, and the retarder housing to seal off the brake systems from the environment.
  • the mechanical seal serves to separate and seal between the working medium circuit, in which the cooling water circulates, and the oil-lubricated drive train (boost).
  • DE 10 2009 058 341 A1 proposes a mechanical seal that has a barrier liquid channel through which a flow of coolant or barrier liquid is conducted in order to cool and lubricate the mechanical seal.
  • the working medium circuit for the retarder is connected to the vehicle cooling circuit and a vehicle water pump is provided, by means of which the cooling water, which is also the working medium of the retarder, is pumped into the circuit. Cooling of the GLRD is ensured if the vehicle water pump provides water throughput in the cooling system and thus in the sealing liquid line.
  • a corresponding cooling system is known, for example, from DE10 2006 054 615 A1.
  • the cooling system includes a mechanical seal that is cooled and/or lubricated by the cooling medium, with a cooling medium pump being provided for circulating the cooling medium in the cooling medium circuit and directly behind the cooling medium pump a cooling medium tap is provided, via which cooling medium is branched off from the cooling medium circuit.
  • the branched-off cooling medium is routed directly through the seal or past the seal in order to cool and/or lubricate it.
  • the cooling medium is returned to the cooling medium circuit in the direction of flow in front of or behind the working chamber of the retarder.
  • the object of this invention is to propose a retarder that is suitable for motor vehicles without an internal combustion engine.
  • a braking system with a hydrodynamic retarder comprising at least one rotor arranged on a shaft and one stator, which are arranged in a common housing and together form a toroidal working chamber which, for the braking operation of the retarder, is supplied with a working medium from a working medium circuit via a working medium inlet can be filled and emptied again for the non-braking operation of the retarder via a working medium outlet.
  • a bypass be provided, via which a sealing liquid channel of a mechanical seal arranged between the housing and the shaft is connected to the working medium circuit.
  • a fluid flow required for cooling and lubricating the mechanical seal is taken from the working medium circuit via the bypass and guided through the barrier liquid channel in the mechanical seal.
  • the bypass is preferably coupled to the working medium inlet, so that the working medium volume taken from the working medium circuit returns to the working medium circuit via the working chamber of the retarder.
  • the working medium inlet is a channel that is arranged in the central area of the toroidal working space, so that the return is possible without counter-pressure.
  • a discharge line is provided, via which a pump can be used to pump working medium out of the working chamber via a pressure line into the working medium circuit or back into the working chamber via a channel that can be shut off by a valve.
  • the working medium volume in the working space can be regulated by targeted control of the valve, with cooler working medium being able to be routed from the working medium circuit into the working space via a control valve if required. As a result, the residual water volume in the work area is regularly exchanged.
  • the bypass can be coupled to the discharge line, so that part of the working medium volume, which is pumped out of the working chamber by the pumping action of the retarder, is pumped through the bypass through the sealing liquid channel.
  • the bypass can be coupled to the pressure line, so that part of the working medium volume, which is conveyed out of the working chamber by the pumping action of the pump, is pumped through the sealing liquid channel via the bypass.
  • the bypass can preferably be a duct integrated into the housing, it also being possible for the duct to run from a line inside or outside the housing.
  • a check valve can be arranged in the bypass behind the sealing liquid channel, viewed in the direction of flow.
  • a pressure tank for receiving working medium is preferably provided in the working medium circuit, this being designed in such a way that the major part of the working medium can be stored in non-braking operation.
  • FIG. 1 shows a first embodiment of a braking system
  • FIG. 2 shows a second embodiment of a braking system
  • FIG. 1 and FIG. 2 show two different versions of a brake system with a retarder, the essential structure of both versions being identical.
  • the braking system comprises a retarder 1, a working medium circuit 15 and a controller 18.
  • the general structure of a retarder or water retarder is sufficiently described in the StdT, so that only the essential details are discussed here.
  • the shaft 16 that can be driven by the drive train 22 is rotatably mounted in the retarder housing, with the rotor 3 and the pump 7 being fastened to the shaft in a rotationally fixed manner.
  • the rotor 3 and the stator 2 form the toroidal working chamber 4, which can be filled with a working medium, cooling water, for the braking operation of the retarder 1 and can be emptied again for the non-braking operation of the retarder.
  • the working medium circuit 15 includes a cooler 19, a compensating volume 21, which can absorb the main working medium volume in non-braking operation, and controllable valves 10, 12 for controlling the working medium volume in the working chamber 4 of the retarder 1.
  • a small proportion of the working medium volume is required in non-braking operation in order to cool and lubricate the mechanical seal 23 and the working chamber 4 , this volume being controllable by means of the valve 10 .
  • valve 10 If valve 10 is closed, pump 7 Working medium is pumped out of the working space via the discharge line 6 and pumped back into the working medium circuit 15 at the appropriate pressure. When the valve 10 is switched to the open position, the working medium is pumped back into the working chamber 4 via the working medium inlet 5 .
  • the control valve 12 is switched regularly in the non-braking mode, so that a small volume of cool working medium reaches the working chamber 4 . Excess heated working medium is pumped back from the working chamber 4 into the working medium circuit 15 .
  • the braking power of the retarder is controlled via the control valve 12.
  • the working medium inlet 5 is connected to the inlet valve 14 and the working medium outlet 11 to the pressure control valve 13, the inlet valve 14 selectively blocking, partially releasing or completely releasing the flow path for the working medium in the working medium inlet 5 .
  • the inlet valve 14 and the pressure control valve 13 can be combined to form a common valve 12 .
  • the control takes place via a control which is connected to the compressed air system, in particular the vehicle compressed air system.
  • the pumping action of the retarder 1 is used to pump the working medium through the working medium circuit 15 so that working medium is constantly pumped through the cooler 19 during braking operation.
  • FIGS. 1 and 2 two solutions are proposed as to how the mechanical seal 23 between the shaft 16 and the retarder housing can be adequately cooled without the pumping capacity of an additional water pump.
  • the essential structure of a mechanical seal is characterized in that the mechanical seal 23 has two sealing elements 25, 26 and a sealing liquid channel 17 in between, so that a fluid-tight separation of the retarder interior, in which the working medium circulates, is guaranteed from the environment on the drive train side.
  • the sealing liquid channel 17 of the mechanical seal is integrated into the working medium circuit 15 via a bypass 24 .
  • the tap is at the discharge line 6, via which the residual water volume is pumped out of the working space 4. Due to the pumping effect of the retarder, there is always a certain pressure of the working medium at the tapping point of the discharge line 6 in the working chamber 4, which pressure varies depending on the speed and degree of filling of the retarder.
  • the working medium passes through the bypass 24a into the sealing liquid channel 17 and from there it is routed back into the working chamber 4 via the working medium inlet 5 .
  • the pressure line is tapped behind that of the pump 7.
  • the pressure of the working medium is determined by the pump 7 at this tapping point. This pressure also varies depending on the speed and degree of filling of the retarder, with the pressure increase by the pump 7 essentially depending on the shaft speed.
  • the working medium passes through the bypass 24 b into the sealing liquid channel 17 and from there it is routed back into the working chamber 4 via the working medium inlet 5 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a braking system having a hydrodynamic retarder, comprising at least one rotor located on a shaft and a stator which are located in a common housing and together form a toroidal working chamber which for the braking mode of the retarder can be filled with a working medium from a working medium circuit via a working medium inlet and can be emptied again via a working medium outlet for the non-braking mode of the retarder. According to the invention a bypass is provided, via which a sealing liquid conduit of a slide ring seal arranged between the housing and the shaft is connected to the working medium circuit.

Description

Bremssystem zur Koppelung mit einem Antriebsstrang Braking system for coupling to a drive train
Die Erfindung betrifft ein Bremssystem zur Koppelung mit einem Antriebsstrang. Das Bremssystem umfasst einen Retarder, einen geschlossenen Arbeitsmediumkreislauf mit einem Kühler, einem Druckausgleichsbehälter und Ventilen, die derart ansteuerbar sind, dass das Arbeitsmediumvolumen im Retarder und damit das Bremsmoment des Retarders regelbar ist. The invention relates to a brake system for coupling to a drive train. The braking system includes a retarder, a closed working medium circuit with a cooler, a pressure equalizing tank and valves that can be controlled in such a way that the working medium volume in the retarder and thus the braking torque of the retarder can be regulated.
Zur Abdichtung von Bremssystemen gegenüber der Umgebung ist zwischen Retarderwelle, an der ein Rotor und eine Pumpe drehfest gekoppelt sind, und dem Retardergehäuse eine Gleitringdichtung (GLRD) vorgesehen. In einem Wasserretarder dient die Gleitringdichtung (GLRD) zur Trennung und Abdichtung zwischen dem Arbeitsmediumkreislauf, in dem Kühlwasser zirkuliert, und dem ölgeschmierten Antriebsstrang (Hochtrieb). A mechanical seal (GLRD) is provided between the retarder shaft, on which a rotor and a pump are coupled in a rotationally fixed manner, and the retarder housing to seal off the brake systems from the environment. In a water retarder, the mechanical seal (GLRD) serves to separate and seal between the working medium circuit, in which the cooling water circulates, and the oil-lubricated drive train (boost).
Die Gleitringdichtung muss gegenüber der Abwärme im Bremsbetrieb des Retarders wie auch gegen zu hohe Reibung geschützt werden. In der DE 10 2009 058 341 A1 wird eine Gleitringdichtung vorgeschlagen, die einen Sperrflüssigkeitskanal aufweist, durch den ein Kühlmittelstrom oder Sperrflüssigkeit geführt wird, um die Gleitringdichtung zu kühlen und zu schmieren. The mechanical seal must be protected against the waste heat from the braking operation of the retarder as well as against excessive friction. DE 10 2009 058 341 A1 proposes a mechanical seal that has a barrier liquid channel through which a flow of coolant or barrier liquid is conducted in order to cool and lubricate the mechanical seal.
In einem Kraftfahrzeug ist der Arbeitsmediumkreislauf für den Retarder, an den Fahrzeugkühlkreislauf angeschlossen und es ist eine Fahrzeug-Wasserpumpe vorgesehen, mittels der das Kühlwasser, welches gleichzeitig das Arbeitsmedium des Retarders ist, im Kreislauf gepumpt wird. Die Kühlung der GLRD ist sichergestellt, wenn die Fahrzeug-Wasserpumpe im Kühlsystem, und damit in der Sperrflüssigkeitsleitung, für Wasserdurchsatz sorgt. In a motor vehicle, the working medium circuit for the retarder is connected to the vehicle cooling circuit and a vehicle water pump is provided, by means of which the cooling water, which is also the working medium of the retarder, is pumped into the circuit. Cooling of the GLRD is ensured if the vehicle water pump provides water throughput in the cooling system and thus in the sealing liquid line.
Ein entsprechendes Kühlsystem ist beispielsweise aus der DE10 2006 054 615 A1 bekannt. Das Kühlsystem umfasst eine mittels dem Kühlmedium gekühlte und/oder geschmierte GLRD wobei eine Kühlmediumpumpe zum Umwälzen des Kühlmediums im Kühlmediumkreislauf vorgesehen ist und unmittelbar hinter der Kühlmediumpumpe ein Kühlmediumabgriff vorgesehen ist, über welchen Kühlmedium aus dem Kühlmediumkreislauf abgezweigt wird. Das abgezweigte Kühlmedium wird direkt durch die Dichtung oder an der Dichtung vorbeigeleitet, um diese zu kühlen und/oder zu schmieren. Vom Sperrflüssigkeitskanal kommend wird das Kühlmedium dem Kühlmediumkreislauf in Strömungsrichtung vor oder hinter dem Arbeitsraum des Retarder wieder zugeführt. A corresponding cooling system is known, for example, from DE10 2006 054 615 A1. The cooling system includes a mechanical seal that is cooled and/or lubricated by the cooling medium, with a cooling medium pump being provided for circulating the cooling medium in the cooling medium circuit and directly behind the cooling medium pump a cooling medium tap is provided, via which cooling medium is branched off from the cooling medium circuit. The branched-off cooling medium is routed directly through the seal or past the seal in order to cool and/or lubricate it. Coming from the sealing liquid channel, the cooling medium is returned to the cooling medium circuit in the direction of flow in front of or behind the working chamber of the retarder.
Für E-Fahrzeuge mit Retarder besteht das Problem, dass eine separate Wasserpumpe einen relativ hohen Aufwand bedeuten würde und somit relativ teuer wäre. For e-vehicles with retarders, there is the problem that a separate water pump would mean a relatively high outlay and would therefore be relatively expensive.
Aufgabe dieser Erfindung ist es, einen Retarder vorzuschlagen, der für KFZ ohne Verbrennungsmotor geeignet ist. The object of this invention is to propose a retarder that is suitable for motor vehicles without an internal combustion engine.
Die Aufgabe wird erfindungsgemäß durch ein Bremssystem mit hydrodynamischem Retarder entsprechend dem unabhängigen Anspruch 1 gelöst. Weitere vorteilhafte Ausführungsformen der vorliegenden Erfindung finden sich in den Unteransprüchen. The object is achieved according to the invention by a braking system with a hydrodynamic retarder in accordance with independent claim 1 . Further advantageous embodiments of the present invention can be found in the dependent claims.
Vorgeschlagen wird ein Bremssystem mit einem hydrodynamischen Retarder, umfassend mindestens einen auf einer Welle angeordneten Rotor und einen Stator, die in einem gemeinsamen Gehäuse angeordnet sind und miteinander einen torusförmigen Arbeitsraum bilden, der für den Bremsbetrieb des Retarders über einen Arbeitsmediumeinlass mit einem Arbeitsmedium aus einem Arbeitsmediumkreislauf befüllbar und für den Nicht-Bremsbetrieb des Retarders über einen Arbeitsmediumauslass wieder entleerbar ist. Proposed is a braking system with a hydrodynamic retarder, comprising at least one rotor arranged on a shaft and one stator, which are arranged in a common housing and together form a toroidal working chamber which, for the braking operation of the retarder, is supplied with a working medium from a working medium circuit via a working medium inlet can be filled and emptied again for the non-braking operation of the retarder via a working medium outlet.
Erfindungsgemäß wird vorgeschlagen, dass ein Bypass vorgesehen ist, über den ein Sperrflüssigkeitskanal einer zwischen Gehäuse und Welle angeordneten Gleitringdichtung an den Arbeitsmediumkreislauf angeschlossen ist. Über den Bypass wird ein für die Kühlung und Schmierung der Gleitringdichtung erforderlicher Fluidstrom aus dem Arbeitsmediumkreislauf entnommen und durch den Sperrflüssigkeitskanal in der Gleitringdichtung geleitet. Vorzugsweise ist der Bypass mit dem Arbeitsmediumeinlass gekoppelt, so dass das dem Arbeitsmediumkreislauf entnommene Arbeitsmediumvolumen über den Arbeitsraum des Retarders in den Arbeitsmediumkreislauf zurückgelangt. Wie aus dem StdT bekannt ist der Arbeitsmediumeinlass ein Kanal der im Zentrumsbereich des torusförmigen Arbeitsraums angeordnet ist, so dass die Rückführung ohne Gegendruck möglich ist. According to the invention, it is proposed that a bypass be provided, via which a sealing liquid channel of a mechanical seal arranged between the housing and the shaft is connected to the working medium circuit. A fluid flow required for cooling and lubricating the mechanical seal is taken from the working medium circuit via the bypass and guided through the barrier liquid channel in the mechanical seal. The bypass is preferably coupled to the working medium inlet, so that the working medium volume taken from the working medium circuit returns to the working medium circuit via the working chamber of the retarder. As known from the StdT, the working medium inlet is a channel that is arranged in the central area of the toroidal working space, so that the return is possible without counter-pressure.
Weiterhin ist eine Abführleitung vorgesehen, über die wahlweise mittels einer Pumpe Arbeitsmedium aus dem Arbeitsraum über eine Druckleitung in den Arbeitsmediumkreislauf oder über einen mittels eines Ventils absperrbaren Kanal zurück in den Arbeitsraum pumpbar ist. Durch gezielte Ansteuerung des Ventils kann die Arbeitsmediumvolumen im Arbeitsraum geregelt werden, wobei bei Bedarf über ein Regelventil kühleres Arbeitsmedium aus dem Arbeitsmediumkreislauf in den Arbeitsraum geleitet werden kann. Dadurch erfolgt regelmäßig ein Austausch des Restwasservolumens im Arbeitsraum. Furthermore, a discharge line is provided, via which a pump can be used to pump working medium out of the working chamber via a pressure line into the working medium circuit or back into the working chamber via a channel that can be shut off by a valve. The working medium volume in the working space can be regulated by targeted control of the valve, with cooler working medium being able to be routed from the working medium circuit into the working space via a control valve if required. As a result, the residual water volume in the work area is regularly exchanged.
In einer ersten Ausführung kann der Bypass mit der Abführleitung gekoppelt sein, so dass ein Teil des Arbeitsmediumvolumens, welches durch die Pumpwirkung des Retarders aus dem Arbeitsraum gefördert wird, über den Bypass durch den Sperrflüssigkeitskanal gepumpt wird. In a first embodiment, the bypass can be coupled to the discharge line, so that part of the working medium volume, which is pumped out of the working chamber by the pumping action of the retarder, is pumped through the bypass through the sealing liquid channel.
In einer zweiten Ausführung kann der Bypass mit der Druckleitung gekoppelt sein, so dass ein Teil des Arbeitsmediumvolumens, welches durch die Pumpwirkung der Pumpe aus dem Arbeitsraum gefördert wird, über den Bypass durch den Sperrflüssigkeitskanal gepumpt wird. In a second embodiment, the bypass can be coupled to the pressure line, so that part of the working medium volume, which is conveyed out of the working chamber by the pumping action of the pump, is pumped through the sealing liquid channel via the bypass.
Vorzugsweise kann der Bypass ein in das Gehäuse integriert Kanal sein, wobei der Kanal auch von einer Leitung innerhalb oder außerhalb des Gehäuses verlaufen kann. Um die Fließrichtung durch den Kanal zu definieren kann im Bypass in Fließrichtung gesehen hinter dem Sperrflüssigkeitskanal ein Rückschlagventil angeordnet sein. lm Arbeitsmediumkreislauf ist vorzugsweise ein Druckbehälter zu Aufnahme von Arbeitsmedium vorgesehen, wobei dieser derart ausgelegt, dass im Nicht- Bremsbetrieb der wesentliche Anteil des Arbeitsmediums gespeichert werden kann. The bypass can preferably be a duct integrated into the housing, it also being possible for the duct to run from a line inside or outside the housing. In order to define the direction of flow through the channel, a check valve can be arranged in the bypass behind the sealing liquid channel, viewed in the direction of flow. A pressure tank for receiving working medium is preferably provided in the working medium circuit, this being designed in such a way that the major part of the working medium can be stored in non-braking operation.
Anhand der folgenden Ausführungsbeispiele wird die Erfindung unter Bezugnahme auf die Zeichnungen näher erläutert. On the basis of the following exemplary embodiments, the invention is explained in more detail with reference to the drawings.
Die Figuren zeigen im Einzelnen: The figures show in detail:
Fig.1 eine erste Ausführung eine Bremssystems 1 shows a first embodiment of a braking system
Fig.2 eine zweite Ausführung eines Bremssystems 2 shows a second embodiment of a braking system
Figur 1 und Figur 2 zeigen zwei unterschiedliche Ausführungen für ein Bremssystem mit Retarder, wobei der wesentliche Aufbau beider Ausführungen identisch ist. Das Bremssystem umfasst einen Retarder 1 , einen Arbeitsmediumkreislauf 15 und eine Steuerung 18. FIG. 1 and FIG. 2 show two different versions of a brake system with a retarder, the essential structure of both versions being identical. The braking system comprises a retarder 1, a working medium circuit 15 and a controller 18.
Der allgemeine Aufbau eines Retarders oder auch Wasserretarders ist im StdT ausreichend beschrieben, so dass hier nur auf die wesentlichen Details eingegangen wird. Die von Antriebsstrang 22 antreibbare Welle 16 ist im Retardergehäuse drehbar gelagert, wobei der Rotor 3 und die Pumpe 7 drehfest auf der Welle befestigt sind. The general structure of a retarder or water retarder is sufficiently described in the StdT, so that only the essential details are discussed here. The shaft 16 that can be driven by the drive train 22 is rotatably mounted in the retarder housing, with the rotor 3 and the pump 7 being fastened to the shaft in a rotationally fixed manner.
Der Rotor 3 und der Stator 2 bilden den torusförmiger Arbeitsraum 4, der für den Bremsbetrieb des Retarders 1 mit einem Arbeitsmedium, Kühlwasser, befüllbar und für den Nicht-Bremsbetrieb des Retarders wieder entleerbar ist. The rotor 3 and the stator 2 form the toroidal working chamber 4, which can be filled with a working medium, cooling water, for the braking operation of the retarder 1 and can be emptied again for the non-braking operation of the retarder.
Der Arbeitsmediumkreislauf 15 umfasst einen Kühler 19, ein Ausgleichsvolumen 21 , das im Nicht-Bremsbetrieb das wesentliche Arbeitsmediumvolumen aufnehmen kann, und ansteuerbare Ventile 10, 12 zur Regelung des Arbeitsmediumvolumens im Arbeitsraum 4 des Retarders 1 . Ein kleiner Anteil von Arbeitsmediumvolumen wird im Nicht-Bremsbetrieb benötigt, um die Gleitringdichtung 23 und den Arbeitsraum 4 zu kühlen und zu schmieren, wobei dieses Volumen mittels des Ventils 10 regelbar ist. Ist das Ventil 10 geschlossen, wird bei entsprechender Drehzahl der Pumpe 7 Arbeitsmedium über die Abführleitung 6 aus dem Arbeitsraum gepumpt und bei entsprechenden Druck zurück in den Arbeitsmediumkreislauf 15 gepumpt. Bei der Schaltung des Ventil 10 in die Offenstellung, wird das Arbeitsmedium über den Arbeitsmediumeinlass 5 zurück in den Arbeitsraum 4 gepumpt. The working medium circuit 15 includes a cooler 19, a compensating volume 21, which can absorb the main working medium volume in non-braking operation, and controllable valves 10, 12 for controlling the working medium volume in the working chamber 4 of the retarder 1. A small proportion of the working medium volume is required in non-braking operation in order to cool and lubricate the mechanical seal 23 and the working chamber 4 , this volume being controllable by means of the valve 10 . If valve 10 is closed, pump 7 Working medium is pumped out of the working space via the discharge line 6 and pumped back into the working medium circuit 15 at the appropriate pressure. When the valve 10 is switched to the open position, the working medium is pumped back into the working chamber 4 via the working medium inlet 5 .
Das Regelventil 12 wird im Nicht-Bremsbetrieb regelmäßig geschaltet, so dass ein geringes Volumen kühles Arbeitsmedium in den Arbeitsraum 4 gelangt. Überschüssiges erwärmtes Arbeitsmedium wird aus dem Arbeitsraum 4 zurück in den Arbeitsmediumkreislauf 15 gepumpt. The control valve 12 is switched regularly in the non-braking mode, so that a small volume of cool working medium reaches the working chamber 4 . Excess heated working medium is pumped back from the working chamber 4 into the working medium circuit 15 .
Im Bremsbetrieb wird die Bremsleistung des Retarders über das Regelventil 12 geregelt. Der Arbeitsmediumeinlass 5 ist mit dem Einlassventil 14 und der Arbeitsmediumauslass 11 mit dem Druckregelventil 13 verbunden, wobei das Einlassventil 14 den Strömungsweg für Arbeitsmedium im Arbeitsmediumeinlass 5 wahlweise versperrt, teilweise freigibt oder ganz freigibt. Das Einlassventil 14 und das Druckregelventil 13 können zu einem gemeinsamen Ventil 12 zusammengefasst werden. Die Ansteuerung erfolgt über ein Regelung die mit dem Druckluftsystem, insbesondere dem Fahrzeugdruckluftsystem, verbunden ist. In braking mode, the braking power of the retarder is controlled via the control valve 12. The working medium inlet 5 is connected to the inlet valve 14 and the working medium outlet 11 to the pressure control valve 13, the inlet valve 14 selectively blocking, partially releasing or completely releasing the flow path for the working medium in the working medium inlet 5 . The inlet valve 14 and the pressure control valve 13 can be combined to form a common valve 12 . The control takes place via a control which is connected to the compressed air system, in particular the vehicle compressed air system.
Die Pumpwirkung des Retarders 1 wird dazu genutzt das Arbeitsmedium durch den Arbeitsmediumkreislauf 15 zu pumpen, so dass im Bremsbetrieb ständig Arbeitsmedium durch den Kühler 19 gepumpt wird. The pumping action of the retarder 1 is used to pump the working medium through the working medium circuit 15 so that working medium is constantly pumped through the cooler 19 during braking operation.
Erfindungsgemäß werden, wie in den Figuren 1 und 2 dargestellt, zwei Lösungen vorgeschlagen, wie die Gleitringdichtung 23 zwischen Welle 16 und Retardergehäuse ohne die Pumpleistung einer zusätzlichen Wasserpumpe ausreichend gekühlt werden kann. Der wesentliche Aufbau einer Gleitringdichtung ist dadurch gekennzeichnet, dass die Gleitringdichtung 23 zwei Dichtelemente 25, 26 und einen dazwischen liegenden Sperrflüsssigkeitskanal 17 aufweist, so dass einen fluiddichte T rennung des Retarderinnenraums, in dem das Arbeitsmedium zirkuliert, gegenüber der Umgebung auf der Antriebsstrangseite gewährleitet ist. According to the invention, as shown in FIGS. 1 and 2, two solutions are proposed as to how the mechanical seal 23 between the shaft 16 and the retarder housing can be adequately cooled without the pumping capacity of an additional water pump. The essential structure of a mechanical seal is characterized in that the mechanical seal 23 has two sealing elements 25, 26 and a sealing liquid channel 17 in between, so that a fluid-tight separation of the retarder interior, in which the working medium circulates, is guaranteed from the environment on the drive train side.
In Figur 1 ist der Sperrflüssigkeitskanal 17 der Gleitringdichtung über einen Bypass 24 in den Arbeitsmediumkreislauf 15 integriert. Der Abgriff erfolgt an der Abführleitung 6, über die auch das Restwasservolumen aus dem Arbeitsraum 4 abgepumpt wird. Durch die Pumpwirkung des Retarders liegt an der Abgriffstelle der Abführleitung 6 im Arbeitsraum 4 immer ein bestimmter Arbeitsmediumdruck an, der je nach Drehzahl und Füllungsgrad des Retarders variiert. Durch den Bypass 24a gelangt das Arbeitsmedium in den Sperrflüssigkeitskanal 17 und von dort wird es über den Arbeitsmediumeinlass 5 zurück in den Arbeitsraum 4 geleitet. In FIG. 1, the sealing liquid channel 17 of the mechanical seal is integrated into the working medium circuit 15 via a bypass 24 . The tap is at the discharge line 6, via which the residual water volume is pumped out of the working space 4. Due to the pumping effect of the retarder, there is always a certain pressure of the working medium at the tapping point of the discharge line 6 in the working chamber 4, which pressure varies depending on the speed and degree of filling of the retarder. The working medium passes through the bypass 24a into the sealing liquid channel 17 and from there it is routed back into the working chamber 4 via the working medium inlet 5 .
In Figur 2 erfolgt der Abgriff an der Druckleitung hinter der der Pumpe 7. An dieser Abgriffstelle wird der Arbeitsmediumdruck von der Pumpe 7 bestimmt. Auch dieser Druck variiert je nach Drehzahl und Füllungsgrad des Retarders, wobei die Druckerhöhung durch die Pumpe 7 im Wesentlichen von der Wellendrehzahl abhängt.In FIG. 2, the pressure line is tapped behind that of the pump 7. The pressure of the working medium is determined by the pump 7 at this tapping point. This pressure also varies depending on the speed and degree of filling of the retarder, with the pressure increase by the pump 7 essentially depending on the shaft speed.
Durch den Bypass 24 b gelangt das Arbeitsmedium in den Sperrflüssigkeitskanal 17 und von dort wird es über den Arbeitsmediumeinlass 5 zurück in den Arbeitsraum 4 geleitet. The working medium passes through the bypass 24 b into the sealing liquid channel 17 and from there it is routed back into the working chamber 4 via the working medium inlet 5 .
Bezugszeichenliste Retarder Stator Rotor Arbeitsraum Arbeitsmediumeinlass Abführleitung Absaugpumpe Druckleitung Kanal Ventil Arbeitsmediumauslass Regelventile Druckregelventil Einlassventil Arbeitsmediumkreislauf Welle Sperrflüssigkeitskanal Regelung Kühler Temperatursensor Druckbehälter Antriebsstrang Gleitringdichtung Bypass Dichtelement außen Dichtelement innen List of reference symbols retarder stator rotor working chamber working medium inlet discharge line suction pump pressure line channel valve working medium outlet control valves pressure control valve inlet valve working medium circuit shaft sealing liquid channel control cooler temperature sensor pressure vessel drive train mechanical seal bypass sealing element outside sealing element inside

Claims

- 8 - Patentansprüche - 8 - Claims
1. Bremssystem mit hydrodynamischem Retarder (1 ), umfassend mindestens einen auf einer Welle (16) angeordneten Rotor (3) und einen Stator (2), die in einem gemeinsamen Gehäuse angeordnet sind und miteinander einen torusförmigen Arbeitsraum (4) bilden, der für den Bremsbetrieb des Retarders (1 ), über einen Arbeitsmediumeinlass (5), mit einem Arbeitsmedium aus einem Arbeitsmediumkreislauf (15) befüllbar und für den Nicht-Bremsbetrieb des Retarders über einen Arbeitsmediumauslass (11 ) wieder in den Arbeitsmediumkreislauf (15) entleerbar ist, dadurch gekennzeichnet, dass der Arbeitsmediumkreislauf (15) einen Bypass (24) umfasst , über den ein Sperrflüssigkeitskanal (17) einer zwischen Gehäuse und Welle (16) angeordneten Gleitringdichtung (23) an den Arbeitsmediumkreislauf (15) angeschlossen ist. 1. Brake system with hydrodynamic retarder (1), comprising at least one on a shaft (16) arranged rotor (3) and a stator (2), which are arranged in a common housing and together form a toroidal working space (4) for the braking operation of the retarder (1) can be filled with a working medium from a working medium circuit (15) via a working medium inlet (5) and can be emptied back into the working medium circuit (15) via a working medium outlet (11) for non-braking operation of the retarder, characterized characterized in that the working medium circuit (15) comprises a bypass (24) via which a sealing liquid channel (17) of a mechanical seal (23) arranged between the housing and the shaft (16) is connected to the working medium circuit (15).
2. Bremssystem nach Anspruch 1 , dadurch gekennzeichnet, dass der Bypass (24) mit dem Arbeitsmediumeinlass (5) gekoppelt ist. 2. Brake system according to claim 1, characterized in that the bypass (24) is coupled to the working medium inlet (5).
3. Bremssystem nach Anspruch 1 , dadurch gekennzeichnet, dass eine Abführleitung (6) vorgesehen ist, über die wahlweise mittels einer Pumpe (7) Arbeitsmedium aus dem Arbeitsraum (4) über eine Druckleitung (8) in den Arbeitsmediumkreislauf (15) oder über einen mittels eines Ventils (10) absperrbaren Kanals (9) zurück in den Arbeitsraum (4) pumpbar ist. 3. Brake system according to claim 1, characterized in that a discharge line (6) is provided, via which, optionally by means of a pump (7), working medium from the working chamber (4) via a pressure line (8) into the working medium circuit (15) or via a can be pumped back into the working chamber (4) by means of a channel (9) that can be shut off by a valve (10).
4. Bremssystem nach Anspruch 3, dadurch gekennzeichnet, dass der Bypass (24) mit der Abführleitung (6) gekoppelt ist. - 9 - Bremssystem nach Anspruch 3, dadurch gekennzeichnet, dass der Bypass (24) mit der Druckleitung (8) gekoppelt ist. Bremssystem nach Anspruch 1 , dadurch gekennzeichnet, dass der Bypass (24) ein in das Gehäuse integriert Kanal ist. Bremssystem nach Anspruch 1 , dadurch gekennzeichnet, dass im Bypass (24) hinter dem Sperrflüssigkeitskanal (17) ein Rückschlagventil angeordnet ist. Bremssystem nach Anspruch 1 , dadurch gekennzeichnet, dass im Arbeitsmediumkreislauf (15) ein Druckbehälter (21 ) zu Aufnahme von Arbeitsmedium vorgesehen ist. 4. Brake system according to claim 3, characterized in that the bypass (24) is coupled to the discharge line (6). - 9 - Braking system according to claim 3, characterized in that the bypass (24) is coupled to the pressure line (8). Braking system according to claim 1, characterized in that the bypass (24) is a channel integrated into the housing. Brake system according to Claim 1, characterized in that a check valve is arranged in the bypass (24) behind the sealing liquid channel (17). Brake system according to claim 1, characterized in that in the working medium circuit (15) a pressure vessel (21) is provided for receiving working medium.
PCT/EP2021/075898 2020-09-30 2021-09-21 Braking system for coupling to a drive train WO2022069290A1 (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
DE102006054615B3 (en) * 2006-11-17 2007-12-20 Voith Patent Gmbh Motor vehicle cooling system for cooling drive motor, has seal in hydrodynamic retarder cooled or lubricated using cooling medium e.g. water, that is branched off from cooling medium circuit by cooling medium knob
WO2010034493A1 (en) * 2008-09-26 2010-04-01 Voith Patent Gmbh Hydrodynamic machine and method for operating the same
DE102009058341A1 (en) * 2009-12-15 2011-06-16 Voith Patent Gmbh Hydrodynamic machine, in particular hydrodynamic retarder

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Publication number Priority date Publication date Assignee Title
DE2016711C3 (en) 1970-04-08 1980-06-12 Daimler-Benz Ag, 7000 Stuttgart Device for relieving and securing of and shaft seals in hydrodynamic brakes (retarders) for vehicles, in particular for motor vehicles
DE102009026721B4 (en) 2009-06-04 2022-06-15 Zf Friedrichshafen Ag Vehicle gearbox with secondary retarder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006054615B3 (en) * 2006-11-17 2007-12-20 Voith Patent Gmbh Motor vehicle cooling system for cooling drive motor, has seal in hydrodynamic retarder cooled or lubricated using cooling medium e.g. water, that is branched off from cooling medium circuit by cooling medium knob
WO2010034493A1 (en) * 2008-09-26 2010-04-01 Voith Patent Gmbh Hydrodynamic machine and method for operating the same
DE102009058341A1 (en) * 2009-12-15 2011-06-16 Voith Patent Gmbh Hydrodynamic machine, in particular hydrodynamic retarder

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