DE10327406A1 - Hydraulic system for power shift transmission has low and high pressure pumps with switch over valve for shift elements to set hydraulic circuit - Google Patents
Hydraulic system for power shift transmission has low and high pressure pumps with switch over valve for shift elements to set hydraulic circuit Download PDFInfo
- Publication number
- DE10327406A1 DE10327406A1 DE2003127406 DE10327406A DE10327406A1 DE 10327406 A1 DE10327406 A1 DE 10327406A1 DE 2003127406 DE2003127406 DE 2003127406 DE 10327406 A DE10327406 A DE 10327406A DE 10327406 A1 DE10327406 A1 DE 10327406A1
- Authority
- DE
- Germany
- Prior art keywords
- pressure pump
- low
- pressure
- high pressure
- hydraulic system
- 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- Withdrawn
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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
-
- 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
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
Abstract
Description
Die vorliegende Erfindung betrifft ein Hydrauliksystem für ein Lastschaltgetriebe gemäß dem Oberbegriff des Patentanspruchs 1. Des weiteren betrifft die Erfindung ein Verfahren zum Betreiben des erfindungsgemäßen Hydrauliksystems.The The present invention relates to a hydraulic system for a power shift transmission according to the generic term of claim 1. Furthermore, the invention relates to a method for operating the hydraulic system according to the invention.
Nach dem Stand der Technik werden Lastschaltgetriebe mit hydraulisch betätigten Schaltelementen überwiegend mittels Konstantpumpen mit hydraulischer Energie versorgt, wobei die Pumpe direkt vom Motor des Fahrzeugs angetrieben wird. Dies führt dazu, dass der Volumenstrom drehzahlabhängig schwankt. Der Ölstrom wird einerseits benötigt, um den Drehmomentwandler und die Getriebeschmierung zu versorgen, wozu ein geringer Druck und ein hoher Volumenstrom erforderlich sind. Andererseits wird ein hoher Druck benötigt, um die Schaltelemente zu betätigen und sicher geschlossen zu halten, wobei in diesem Fall ein geringer Volumenstrom ausreicht. Deswegen wird nach dem Stand der Technik die Pumpe so ausgelegt, dass im mittleren Drehzahlbereich ausreichend Öl zur Verfügung steht. Hierbei wird der gesamte Ölstrom auf das Niveau des Hochdrucks vorgespannt.To The prior art are power shift with hydraulic actuated Switching elements predominantly powered by constant displacement pumps with hydraulic energy, where the pump is driven directly by the engine of the vehicle. This leads to, that the volume flow fluctuates depending on the speed. The oil flow is one hand, to power the torque converter and gearbox lubrication, which requires a low pressure and a high volume flow are. On the other hand, a high pressure is needed to the switching elements to press and to keep it securely closed, in which case a lower one Volume flow is sufficient. Therefore, according to the prior art The pump is designed so that sufficient oil is available in the medium speed range. in this connection becomes the entire oil flow biased to the level of high pressure.
Dies führt in nachteiliger Weise dazu, dass bei hoher Drehzahl überschüssiges Öl vom Hochdruckbereich in den Niederdruckbereich und von dort in den Getriebesumpf einfach abgedrosselt wird. Dadurch entstehen große Drosselverluste, die den Wirkungsgrad des Getriebes negativ beeinflussen.This leads in disadvantageous way that at high speed excess oil from the high pressure area into the low-pressure area and from there into the transmission sump easily is throttled. This results in large throttle losses that the Effectively influence the efficiency of the transmission.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Hydrauliksystem für ein Lastschaltgetriebe anzugeben, welches die genannten Nachteile des Standes der Technik vermeidet. Zudem soll der Energiebedarf sowie der Steuerungsaufwand möglichst niedrig gehalten werden. Des weiteren soll ein Verfahren zum Betreiben des erfindungsgemäßen Hydrauliksystems angegeben werden.Of the present invention is based on the object, a hydraulic system for a Specify power shift transmission, which the mentioned disadvantages of Prior art avoids. In addition, the energy needs and the control effort as possible kept low. Furthermore, a method for operating the hydraulic system according to the invention be specified.
Diese Aufgabe wird für eine Hydrauliksystem durch die Merkmale des Patentanspruchs 1 gelöst. Ein Verfahren zum Betreiben des erfindungsgemäßen Hydraulikkreises ist Gegenstand der Patentansprüche 7 und 8. Weitere Ausgestaltungen und Vorteile gehen aus den entsprechenden Unteransprüchen hervor.These Task is for a hydraulic system solved by the features of claim 1. One Method for operating the hydraulic circuit according to the invention is the subject of the claims 7 and 8. Further embodiments and advantages will be apparent from the corresponding dependent claims out.
Demnach wird ein Hydrauliksystem vorgeschlagen, welches zwei Pumpen umfasst, wobei eine Pumpe als Niederdruckpumpe und die zweite Pumpe als Hochdruckpumpe ausgebildet ist, wobei die Pumpen jeweils in einen Hydraulikkreis integriert sind. Für jedes Schaltelement ist ein Umschaltventil vorgesehen, mittels dessen der Hydraulikkreis der Niederdruckpumpe oder der Hochdruckpumpe als Hydraulikversorgung der Schaltelemente, insbesondere während der Befüllung eingestellt wird.Therefore a hydraulic system is proposed which comprises two pumps, one pump being a low-pressure pump and the second pump being a high-pressure pump is formed, wherein the pumps each in a hydraulic circuit are integrated. For each Switching element is provided a switching valve, by means of which the hydraulic circuit of the low pressure pump or the high pressure pump as hydraulic supply of the switching elements, in particular during the filling is set.
Vorzugsweise wird die Niederdruckpumpe vom Motor angetrieben; die Hochdruckpumpe wird bevorzugterweise elektrisch angetrieben.Preferably the low pressure pump is driven by the engine; the high pressure pump is preferably driven electrically.
Gemäß der Erfindung saugt die Niederdruckpumpe Öl aus dem Reservoir und fördert dieses in das System, wobei über ein Druckbegrenzungsventil der Niederdruck begrenzt wird. Der Wert des Niederdruckes ist so eingestellt, dass er nur wenig über dem höchsten Druckbedarf der nachgeschalteten Verbraucher liegt, was zu einer Reduzierung der Verluste führt. Die Niederdruckpumpe kann in vorteilhafter Weise als einfache Zahnradpumpe ausgeführt werden, wodurch die Herstellungskosten reduziert werden.According to the invention the low pressure pump sucks oil from the reservoir and promotes this in the system, being over a pressure relief valve is limited to the low pressure. The value The low pressure is set so that it is only slightly above the highest pressure requirement the downstream consumer, resulting in a reduction the losses leads. The low-pressure pump can advantageously as a simple gear pump accomplished which reduces manufacturing costs.
Die zweite Pumpe, die als Hochdruckpumpe ausgeführt ist, entnimmt Öl aus dem Reservoir und spannt dieses auf den von den Schaltelementen benötigten Hochdruck vor. Durch das Vorsehen der zweiten Pumpe kann die erste Pumpe kleiner gehalten werden. Erfindungsgemäß kann die zweite Pumpe durch den elektrischen Antrieb im unteren Antriebsmotordrehzahlbereich die prinzipielle Unterdeckung des Schmier-Ölstroms durch eine erhöhte Fördermenge ausgleichen; im oberen Drehzahlbereich kann die zweite Pumpe in ihrer Fördermenge zurückgenommen werden, um die Verluste weiter zu minimieren; nicht benötigtes Öl wird in den Niederdruckkreiszurückgegeben.The second pump, which is designed as a high pressure pump, removes oil from the Reservoir and tensions this on the high pressure required by the switching elements in front. By providing the second pump, the first pump can be smaller being held. According to the invention, the second pump by the electric drive in the lower drive motor speed range the principal undercover of the lubricating oil flow through an increased output balance; in the upper speed range, the second pump in their flow rate withdrawn to further minimize losses; Unused oil will be in the low pressure circuit is returned.
Bei Befüllung des Leervolumens eines Schaltelementes wird über ein 3/2-Wegeventil Öl aus dem Niederdruckkreis entnommen. Bei einer Druckhöhe in der Zuführung zwischen dem Befülldruck und dem Niveau des Niederdrucks wird das Ventil umgeschaltet und die weitere Betätigung des Schaltelementes erfolgt mit dem von der Hochdruckpumpe gelieferten Hochdruck, so dass aus dem Hochdruckkreis nur noch die Leckage des Schaltelementes gedeckt werden muss.at filling the void volume of a switching element is via a 3/2-way valve oil from the Low pressure circuit taken. At a pressure level in the feeder between the filling pressure and the level of low pressure, the valve is switched and the further operation the switching element takes place with that supplied by the high-pressure pump High pressure, so that from the high pressure circuit only the leakage of Switching element must be covered.
Im Gegensatz zu anderen vorgeschlagenen Lösungen findet die Umschaltung unmittelbar statt, ohne das Niederdruckniveau auf den Wert des Hochdrucks anzuheben; dadurch wird die Spontaneität der Schaltungen erhöht.in the Unlike other proposed solutions, the switch finds immediately, without the low pressure level on the value of the high pressure to raise; This increases the spontaneity of the circuits.
Im Rahmen einer bevorzugten Ausführungsform der Erfindung werden Druckspitzen, die eventuell in der Zuleitung zum Steuerorgan entstehen können, über eine erfindungsgemäß vorgeschaltete Blende geeigneter Größe abgedämpft. Beim Abschalten des Schaltelementes wird die Umschalteinrichtung über eine Feder wieder in ihren Ausgangszustand versetzt.in the Frame of a preferred embodiment The invention will be pressure peaks, possibly in the supply line can arise to the control organ, over a According to the invention upstream aperture suitable size attenuated. At the Switching off the switching element, the switching device via a Spring returned to its original state.
Gemäß einer besonders vorteilhaften Ausführungsform der vorliegenden Erfindung ist vorgesehen, dass die zweite Pumpe (Hochdruckpumpe) aus dem Niederdruckkreis statt aus dem Reservoir Öl ansaugt. Durch diese Anordnung entfällt die Installation eines zweiten Druck-Filterelementes. Hierbei entnimmt die zweite Pumpe entsprechend ihrem Hubvolumen Öl aus dem Niederdruckkreis und spannt das Öl auf den Hochdruck weiter vor.According to one particularly advantageous embodiment The present invention provides that the second pump (High-pressure pump) from the low pressure circuit instead of sucking from the reservoir oil. By this arrangement is omitted the installation of a second pressure filter element. This takes the second pump according to its stroke volume oil from the low pressure circuit and tense the oil on the high pressure ahead.
Eine weitere Ausführungsform sieht vor, dass der Niederdruckkreis vor der Umschaltung auf das Hochdruckniveau gebracht wird, wobei die Umschaltung während der Kupplungsbefüllung bzw. während der Modulation des Niederdrucks durchgeführt wird.A another embodiment provides that the low pressure circuit before switching to the High pressure level is brought, wherein the switching during the clutch filling or during the modulation of the low pressure is performed.
Die Erfindung wird im folgenden anhand der beigefügten Figuren beispielhaft näher erläutert.The The invention will be explained in more detail below with reference to the accompanying figures by way of example.
Es stellen dar:It represent:
Der allgemeine Aufbau und die Funktionsweise von Hydraulikkreisen sind dem Fachmann bestens bekannt. Hier soll daher nur auf Besonderheiten der vorliegenden Erfindung eingegangen werden.Of the general structure and operation of hydraulic circuits are well known to the skilled person. Here should therefore only on special features of the present invention.
In
Wenn
z. B. das Schaltelement
Um
Druckspitzen, die eventuell in der Zuleitung zum Steuerorgan entstehen
können
abzudämpfen,
ist erfindungsgemäß vor dem
Ventil
Wie
aus
- 11
- NiederdruckpumpeLow pressure pump
- 22
- Hochdruckpumpehigh pressure pump
- 33
- Wandlerconverter
- 44
- Schaltelementswitching element
- 55
- Umschaltventilswitching valve
- 66
- Blendecover
- 77
- Reservoirreservoir
- 88th
- Druckventilpressure valve
- 99
- Kupplungsventilclutch valve
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003127406 DE10327406A1 (en) | 2003-06-18 | 2003-06-18 | Hydraulic system for power shift transmission has low and high pressure pumps with switch over valve for shift elements to set hydraulic circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE2003127406 DE10327406A1 (en) | 2003-06-18 | 2003-06-18 | Hydraulic system for power shift transmission has low and high pressure pumps with switch over valve for shift elements to set hydraulic circuit |
Publications (1)
Publication Number | Publication Date |
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DE10327406A1 true DE10327406A1 (en) | 2005-02-03 |
Family
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Family Applications (1)
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DE2003127406 Withdrawn DE10327406A1 (en) | 2003-06-18 | 2003-06-18 | Hydraulic system for power shift transmission has low and high pressure pumps with switch over valve for shift elements to set hydraulic circuit |
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Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006099947A1 (en) * | 2005-03-22 | 2006-09-28 | Zf Friedrichshafen Ag | Method and device for controlling the oil supply of an automatic gearbox and a starting element |
EP1865236A1 (en) * | 2006-06-09 | 2007-12-12 | Robert Bosch Gmbh | Hydraulically actuated continuously variable transmission for a vehicular drive line provided with an internal combustion engine |
US7487866B2 (en) | 2005-06-28 | 2009-02-10 | Volkswagen Ag | Hydraulic circuit for a transmission of a motor vehicle |
WO2009018808A1 (en) * | 2007-08-07 | 2009-02-12 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Hydraulic arrangement for an automatic transmission |
DE102008040667A1 (en) * | 2008-07-24 | 2010-01-28 | Zf Friedrichshafen Ag | Hydraulic system of a transmission device with a transmission main pump and an additional pump |
WO2010067189A1 (en) * | 2008-12-12 | 2010-06-17 | Toyota Jidosha Kabushiki Kaisha | Hydraulic control apparatus and hydraulic control method |
US20120055146A1 (en) * | 2009-05-05 | 2012-03-08 | Michael Baraga | Drive train device |
EP2441985A3 (en) * | 2010-10-12 | 2012-07-04 | Hyundai Motor Company | Oil supply system of automatic transmission |
US8266986B2 (en) | 2010-01-19 | 2012-09-18 | GM Global Technology Operations LLC | Transmission hydraulic control system having a dual element pump |
US8347618B2 (en) | 2009-05-13 | 2013-01-08 | Deere & Company | Dual pump hydraulic system |
CN101871543B (en) * | 2009-04-23 | 2013-01-09 | 昆明物理研究所 | Parallel time-delay pressure-reducing valve |
US8402993B2 (en) | 2010-05-10 | 2013-03-26 | GM Global Technology Operations LLC | Hydraulic fluid cooling system for a dual clutch automatic transmission |
US8413437B2 (en) | 2009-12-08 | 2013-04-09 | GM Global Technology Operations LLC | Transmission hydraulic control system having independently controlled stator cooling flow |
CN103133688A (en) * | 2011-11-29 | 2013-06-05 | 现代自动车株式会社 | Hydraulic pressure control apparatus for automatic transmission |
US8475336B2 (en) | 2009-07-30 | 2013-07-02 | GM Global Technology Operations LLC | Hydraulic control system for a dual clutch transmission |
US8613681B2 (en) | 2009-11-19 | 2013-12-24 | GM Global Technology Operations LLC | Transmission hydraulic control system having clutch compensator feed override |
KR101394038B1 (en) * | 2012-09-03 | 2014-05-12 | 현대자동차 주식회사 | Oil pressure supply system of automatic transmission |
US8844392B2 (en) | 2010-06-09 | 2014-09-30 | Gm Global Technology Operations, Llc | Electro-hydraulic and electro-mechanical control system for a dual clutch transmission |
US8915076B2 (en) | 2011-01-12 | 2014-12-23 | Gm Global Technology Operations, Llc | Transmission hydraulic control system having flow augmentation |
US8942901B2 (en) | 2010-12-09 | 2015-01-27 | Gm Global Technology Operations, Llc | Method of controlling a hydraulic control system for a dual clutch transmission |
US8967351B2 (en) | 2012-08-14 | 2015-03-03 | Gm Global Technology Operations, Llc | Transmission clutch piston compensator feed circuit |
US9175764B2 (en) | 2011-11-29 | 2015-11-03 | Hyundai Motor Company | Hydraulic pressure control apparatus for automatic transmission |
DE102005029963B4 (en) | 2005-06-28 | 2018-10-11 | Volkswagen Ag | Hydraulic circuit for a transmission of a motor vehicle |
DE102015012345B4 (en) | 2015-09-22 | 2022-01-20 | Daimler Ag | Equipment system for a motor vehicle drive train |
US20220112906A1 (en) * | 2020-10-14 | 2022-04-14 | Fte Automotive Gmbh | Pump unit for clutch actuation |
-
2003
- 2003-06-18 DE DE2003127406 patent/DE10327406A1/en not_active Withdrawn
Cited By (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101147014B (en) * | 2005-03-22 | 2010-07-21 | Zf腓德烈斯哈芬股份公司 | Method and device for controlling the oil supply of an automatic gearbox and a starting element |
WO2006099947A1 (en) * | 2005-03-22 | 2006-09-28 | Zf Friedrichshafen Ag | Method and device for controlling the oil supply of an automatic gearbox and a starting element |
US7951043B2 (en) | 2005-03-22 | 2011-05-31 | Zf Friedrichshafen Ag | Method and device for controlling the oil supply of an automatic gearbox and a starting element |
JP2008536060A (en) * | 2005-03-22 | 2008-09-04 | ツェットエフ、フリードリッヒスハーフェン、アクチエンゲゼルシャフト | Method and apparatus for controlling the oil supply to automatic transmissions and starting elements |
US7487866B2 (en) | 2005-06-28 | 2009-02-10 | Volkswagen Ag | Hydraulic circuit for a transmission of a motor vehicle |
DE102005029964B4 (en) | 2005-06-28 | 2018-10-11 | Volkswagen Ag | Hydraulic circuit for a transmission of a motor vehicle |
DE102005029963B4 (en) | 2005-06-28 | 2018-10-11 | Volkswagen Ag | Hydraulic circuit for a transmission of a motor vehicle |
CN101490445B (en) * | 2006-06-09 | 2013-01-23 | 罗伯特·博世有限公司 | Hydraulically actuated continuously variable transmission for a vehicular drive line provided with an internal combustion engine |
WO2007141323A1 (en) * | 2006-06-09 | 2007-12-13 | Robert Bosch Gmbh | Hydraulically actuated continuously variable transmission for a vehicular drive line provided with an internal combustion engine |
EP1865236A1 (en) * | 2006-06-09 | 2007-12-12 | Robert Bosch Gmbh | Hydraulically actuated continuously variable transmission for a vehicular drive line provided with an internal combustion engine |
WO2009018808A1 (en) * | 2007-08-07 | 2009-02-12 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Hydraulic arrangement for an automatic transmission |
US8141355B2 (en) | 2007-08-07 | 2012-03-27 | Schaeffler Technologies AG & Co. KG | Hydraulic system for an automatic transmission |
DE102008040667A1 (en) * | 2008-07-24 | 2010-01-28 | Zf Friedrichshafen Ag | Hydraulic system of a transmission device with a transmission main pump and an additional pump |
WO2010067189A1 (en) * | 2008-12-12 | 2010-06-17 | Toyota Jidosha Kabushiki Kaisha | Hydraulic control apparatus and hydraulic control method |
US8845488B2 (en) | 2008-12-12 | 2014-09-30 | Toyota Jidosha Kabushiki Kaisha | Hydraulic control apparatus and hydraulic control method |
CN101871543B (en) * | 2009-04-23 | 2013-01-09 | 昆明物理研究所 | Parallel time-delay pressure-reducing valve |
US8955316B2 (en) * | 2009-05-05 | 2015-02-17 | Daimler Ag | Drive train device |
US20120055146A1 (en) * | 2009-05-05 | 2012-03-08 | Michael Baraga | Drive train device |
US8347618B2 (en) | 2009-05-13 | 2013-01-08 | Deere & Company | Dual pump hydraulic system |
DE102010028635B4 (en) * | 2009-05-13 | 2021-04-15 | Deere & Company | Double pump hydraulic system for a vehicle |
US8475336B2 (en) | 2009-07-30 | 2013-07-02 | GM Global Technology Operations LLC | Hydraulic control system for a dual clutch transmission |
US8613681B2 (en) | 2009-11-19 | 2013-12-24 | GM Global Technology Operations LLC | Transmission hydraulic control system having clutch compensator feed override |
US8413437B2 (en) | 2009-12-08 | 2013-04-09 | GM Global Technology Operations LLC | Transmission hydraulic control system having independently controlled stator cooling flow |
US8266986B2 (en) | 2010-01-19 | 2012-09-18 | GM Global Technology Operations LLC | Transmission hydraulic control system having a dual element pump |
US8402993B2 (en) | 2010-05-10 | 2013-03-26 | GM Global Technology Operations LLC | Hydraulic fluid cooling system for a dual clutch automatic transmission |
US8844392B2 (en) | 2010-06-09 | 2014-09-30 | Gm Global Technology Operations, Llc | Electro-hydraulic and electro-mechanical control system for a dual clutch transmission |
EP2441985A3 (en) * | 2010-10-12 | 2012-07-04 | Hyundai Motor Company | Oil supply system of automatic transmission |
US9765885B2 (en) | 2010-12-09 | 2017-09-19 | GM Global Technology Operations LLC | Method of controlling a hydraulic control system for a dual clutch transmission |
US8942901B2 (en) | 2010-12-09 | 2015-01-27 | Gm Global Technology Operations, Llc | Method of controlling a hydraulic control system for a dual clutch transmission |
US8915076B2 (en) | 2011-01-12 | 2014-12-23 | Gm Global Technology Operations, Llc | Transmission hydraulic control system having flow augmentation |
US9175764B2 (en) | 2011-11-29 | 2015-11-03 | Hyundai Motor Company | Hydraulic pressure control apparatus for automatic transmission |
CN103133688A (en) * | 2011-11-29 | 2013-06-05 | 现代自动车株式会社 | Hydraulic pressure control apparatus for automatic transmission |
US8967351B2 (en) | 2012-08-14 | 2015-03-03 | Gm Global Technology Operations, Llc | Transmission clutch piston compensator feed circuit |
KR101394038B1 (en) * | 2012-09-03 | 2014-05-12 | 현대자동차 주식회사 | Oil pressure supply system of automatic transmission |
DE102015012345B4 (en) | 2015-09-22 | 2022-01-20 | Daimler Ag | Equipment system for a motor vehicle drive train |
US20220112906A1 (en) * | 2020-10-14 | 2022-04-14 | Fte Automotive Gmbh | Pump unit for clutch actuation |
US11719239B2 (en) * | 2020-10-14 | 2023-08-08 | Fte Automotive Gmbh | Pump unit for clutch actuation |
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