EP2791553A1 - Procédé permettant d'ajuster le niveau d'un fluide dans une partie de boîtier - Google Patents

Procédé permettant d'ajuster le niveau d'un fluide dans une partie de boîtier

Info

Publication number
EP2791553A1
EP2791553A1 EP12780753.5A EP12780753A EP2791553A1 EP 2791553 A1 EP2791553 A1 EP 2791553A1 EP 12780753 A EP12780753 A EP 12780753A EP 2791553 A1 EP2791553 A1 EP 2791553A1
Authority
EP
European Patent Office
Prior art keywords
housing
level
fluid
pressure
pump
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Withdrawn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
EP12780753.5A
Other languages
German (de)
English (en)
Inventor
Wolfgang Rebholz
Juergen Legner
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 EP2791553A1 publication Critical patent/EP2791553A1/fr
Withdrawn legal-status Critical Current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
    • F16H57/0409—Features relating to lubrication or cooling or heating characterised by the problem to increase efficiency, e.g. by reducing splash losses
    • 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
    • F16H57/0447—Control of lubricant levels, e.g. lubricant level control dependent on temperature
    • 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
    • F16N—LUBRICATING
    • F16N19/00—Lubricant containers for use in lubricators or lubrication systems
    • F16N19/006—Maintaining oil level

Definitions

  • the invention relates to a device for adjusting a fluid level in a housing portion according to the closer defined in the preamble of claim 1.
  • a device for adjusting the oil level in a transmission which has at least two separate transmission housing chambers or housing areas which are partially filled with oil and partly with air and between which an oil exchange is possible, is known from EP 0 406 649 A1.
  • air is forced into a first gear housing chamber in which there is a tendency for oil accumulation, so that oil is displaced from the first gear housing chamber and fed into a second gear housing chamber.
  • the air pump or the pump device is located in an air channel, which connects the two gear housing chambers together.
  • the first gear housing chamber is hermetically sealed to the outside.
  • the oil level in the first transmission housing chamber is to be lowered via the device to a defined fluid level level to avoid power losses caused by oil splashing of arranged in the first gear housing chamber rotating components.
  • the fluid level or the oil level in the first gear housing chamber adjusts depending on the performance of the air pump, wherein the oil level in the first gear housing chamber is also dependent on the oil viscosity, flow resistance and the capacity of the pump device.
  • the pump is to be provided with a correspondingly high delivery rate in order to be able to lead the oil level in the first transmission housing chamber to a defined fluid level even at high viscosity of the oil.
  • the dimensioning of the air pump to be provided as a function of unfavorable operating states results in the oil level being lowered below the defined fluid level due to the non-variable speed-dependent delivery rate of the air pump and possibly all of the oil from the first gear housing chamber into the second transmission housing chamber is guided, so that with increasing operating time of the air pump and air from the first gear housing chamber is conveyed into the second gear housing chamber.
  • the introduced via the air pump in the second gear housing chamber air is before consuming the oil in the direction of a gear pump through which, for example, the gearbox is supplied with oil, to deposit over complex measures from the oil to the functioning of the gear pump affecting phenomena, such as cavitation or like to avoid.
  • the present invention is therefore based on the object to provide a device for adjusting a fluid level in a housing area available to be avoided over the unwanted air pockets in the fluid in a simple manner.
  • the inventive device for adjusting a fluid level in a housing portion which is connected to a further housing portion for the exchange of fluid and which is in operative connection with a pressure side of a pump device, with increasing internal pressure in the housing portion, which is changeable on the pump side, increasingly fluid from the housing portion in the further housing portion is convertible, is formed with a device whose operating state varies depending on the fluid level, wherein in the case of a defined Fluid Hällstandsmillions in the housing area, the internal pressure in the housing area is adjustable via the device to a pressure level equivalent to the defined Fluid circulllstandslomi.
  • the defined fluid level in the housing area is always set via the device according to the invention in the housing area, since the pump-side pressure in the housing area, in whose dependence the level varies in the housing area, via the device in a simple manner on the Level at which the defined or desired fluid filling Level is.
  • a higher pressure is preferably regulated in the housing area via the device when the fluid to be led out of the housing area in the direction of the further housing area has, for example, a high viscosity, as at low operating temperatures.
  • a lower pressure is preferably regulated in the housing area via the device when the fluid is present, for example, due to higher operating temperatures with a lower viscosity.
  • the fluid level set via the device according to the invention in the housing area is also independent of the fluid quantity currently flowing into the housing area, since the device only sets the pressure in the housing area to the equivalent pressure level when the defined fluid level is reached.
  • the pump device can be designed as a plunger, gear or centrifugal pump, preferably as a piston air pump, depending on the respective application.
  • a check valve is provided between the housing region and the pressure side of the pump device, a backflow of fluid from the housing region in the direction of the pump device is reliably avoided in a simple manner.
  • the suction side of the pump device is connected to the further housing region, which is a structurally simple way a closed system, via the entry of dirt particles and the like is avoided with little effort.
  • a suction side of the pump device is additionally or additionally connected to an environment of the housing region and if a filter device is provided between the suction side and the environment, an operation of the device according to the invention is ensured, for example due to a constant suction-side pressure, the air supply with corresponding structural conditions Low cost feasible and preferably prevents the entry of dirt particles and the like through the air filter.
  • the device has a float valve which has a floating depending on the Fluidyogllstandes in the housing area floating body, which is connected to a valve housing movable in the valve slide, above the defined level in the housing area the pressure side the pump device is separated from a low-pressure region and is connected to the fluid level level when it is present.
  • the pump device is automatically switched to short circuit on the device upon reaching the defined Fluid Stahlllstandsrises and deactivated the effect of promotional pumping device to the pressure in the housing area in a simple manner until the defined fluid level in the housing area is exceeded again.
  • the low-pressure region is the suction side of the pump device.
  • the device can be arranged in areas of known systems without complex design measures in which sufficient installation space is available for the device. If the defined level of fluid level corresponds to a filling level of the housing area, to which rotatable components arranged in the interior of the housing area are arranged substantially completely above the fluid, unnecessary splashing losses are reliably avoided.
  • the figure shows a device 1 for adjusting a fluid level in a housing portion 2, which is connected to a further housing portion 3 via a line 4 and which is in operative connection with a pressure side 5 of a pump device 6.
  • a device 1 for adjusting a fluid level in a housing portion 2 which is connected to a further housing portion 3 via a line 4 and which is in operative connection with a pressure side 5 of a pump device 6.
  • fluid which in the present case is hydraulic fluid, is increasingly transferred from the housing area 2 into the further housing area 3 transferable.
  • the housing portion 2 is designed substantially pressure-tight, whereby a pump-side conveying air into the interior 7 of the housing portion 2 and above the level of the fluid in the housing portion 2 leads to an increase in the pressure in the housing area.
  • the line 4 branches off below the filling level of the fluid in the housing area 2 in the direction of the further housing area 3. With As pressure increases in the interior 7 of the housing region 2, fluid is forced out of the housing region 2 in the direction of the further housing region 3.
  • the operating state varies depending on the fluid level in the housing portion 2. If a defined level of fluid level 9 is present in the housing area 2, the internal pressure in the housing area 2 is equivalent via the device 8 to a fluid level level 9 that is defined
  • the device 8 is formed in the embodiment shown in the figure with a float valve 10, which has a depending on the Fluid Strukturllstandes in the housing portion 2 movable float 1 1.
  • the float 1 1 is fixedly connected to a valve housing 12 movably arranged valve spool 13.
  • About the valve spool 13 is above the defined fluid level 9, the pressure side 5 of the pump device 6 of a low pressure region 15, which is the suction side of the pump device 6, separated and connected in the presence of the defined Fluid Strukturllstands stipulates with the low pressure region or the suction side 15.
  • the pump device 6 is executed in the embodiment of the device 1 shown in the figure as a piston air pump, which is driven by a plunger 1 6, which slides on an eccentric 17.
  • the eccentric is in this case made in one piece with a gear 18, whereby the eccentric 17 raises and lowers the plunger 1 6 with rotating gear 18.
  • a piston 19 of the pump device 6 is moved. If the piston 19 is guided in the direction of the toothed wheel 18, air is drawn in via a first check valve 20 of the pump device 6. Depending on the respective application, the air is either sucked in from the environment of the housing region 2 via a filter device 24 or removed from the air space of the further housing region 3. If the plunger 16 has reached its lowest point together with the piston 19 by means of a corresponding eccentric actuation, the plunger 16 together with the piston 19 is moved away from the gear 18 via the eccentric 17. moves, which leads to a closing of the first check valve 20.
  • the float valve 10 of the device 8 is arranged in the present case in the housing portion 2 and the valve spool 13 closes the bypass line 23 in the presence of fluid levels in the housing portion 2 above the defined Fluid Hällstandsni- veaus. As soon as the defined fluid level level 9 is reached, the bypass line 23 is opened by the float valve 10 and there is a connection between the pressure side 5 and the suction side 15 of the pump device 6. The pressure or air pressure which arises in the housing region 2 is dependent on the flow resistance of the hydraulic fluid flowing back in the region of the line 4. If the housing region 2 is arranged lower than the further housing region 3, which in the present case represents an oil tank of a transmission device, the geodetic difference between the fluid level in the housing portion 2 and the Fluid Stahlll- in the other housing area 3 to overcome.
  • the pressure in the interior 7 of the housing area 2 is set to a pressure value equivalent to the defined fluid level level 9 and the defined fluid level level 9 is adjusted.
  • the device 1 ensures that regardless of the flow resistance in the region of the line 4 at promotional pump device 6 always set the fluid level level 9 in the housing area. In addition, it is also avoided that excess air enters the hydraulic fluid, since the fluid level in the housing portion 2 is never lowered by the pump device 6 to a level to which air is conducted from the housing portion 2 in the direction of the further housing portion 3 via the line 4.
  • the defined fluid level level 9 corresponds to a level to which rotating components arranged in the housing area 2 do not submerge in the hydraulic fluid volume present in the housing area 2, thus avoiding splashing losses in a simple manner.
  • hydrostatic units which are usually filled completely with oil.
  • the rotating components cause without corresponding reduction of the fluid level considerable losses, since the hydraulic systems are usually arranged such that the hydrostatic units are lower than the oil level in the oil tank.
  • Splash losses are caused by a corresponding increase in the pressure in the housing of a hydrostatic device. see unit with simultaneous lowering of the fluid level in a simple way reduced or avoided.
  • the housings of hydrostatic units are therefore usually completely filled with hydraulic fluid, since leakage oil flows back into the housing.
  • the excess amount of the feed pump is passed into the pump housing, while hydraulic motors in addition to the amount of leakage oil often also the flushing oil is introduced into the housing.
  • the device according to the invention in particular the embodiment of the device 1 shown in the figure in combination with electric motors and generators, which are cooled and lubricated with spray oil. Since the rotors run in the air space and no oil is allowed to pass in the gap between rotors and starters, it is advantageous if oil from the engine and generator receiving housings is transported in the manner described above.
  • a relatively constant fluid level in the housing area is independent of the respective design of the housing portion and the other housing portion and also independently of the current amount flowing back into the housing area and the flow resistance of the returning hydraulic fluid from the housing area in the other housing area adjustable.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne un dispositif (1) permettant d'ajuster le niveau d'un fluide dans une partie de boîtier (2) qui est reliée à une autre partie de boîtier (3) pour l'échange d'un fluide et qui coopère avec un côté pression (5) d'un système de pompe (6). Plus la pression interne dans la partie de boîtier (2), pouvant être modifiée côté pompe, augmente, plus la quantité de fluide pouvant être transférée de la partie de boîtier (2) dans l'autre partie de boîtier (3) augmente. Selon l'invention, un dispositif (8) dont l'état de fonctionnement varie en fonction du niveau de fluide permet, en présence d'un niveau de fluide défini (9) dans la partie de boîtier (2), d'ajuster la pression interne dans la partie de boîtier (2) à une valeur de pression équivalant au niveau de fluide défini.
EP12780753.5A 2011-12-13 2012-11-05 Procédé permettant d'ajuster le niveau d'un fluide dans une partie de boîtier Withdrawn EP2791553A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011088363A DE102011088363A1 (de) 2011-12-13 2011-12-13 Vorrichtung zum Einstellen eines Fluidfüllstandes in einem Gehäusebereich
PCT/EP2012/071786 WO2013087292A1 (fr) 2011-12-13 2012-11-05 Procédé permettant d'ajuster le niveau d'un fluide dans une partie de boîtier

Publications (1)

Publication Number Publication Date
EP2791553A1 true EP2791553A1 (fr) 2014-10-22

Family

ID=47116001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12780753.5A Withdrawn EP2791553A1 (fr) 2011-12-13 2012-11-05 Procédé permettant d'ajuster le niveau d'un fluide dans une partie de boîtier

Country Status (3)

Country Link
EP (1) EP2791553A1 (fr)
DE (1) DE102011088363A1 (fr)
WO (1) WO2013087292A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017202693B3 (de) 2017-02-20 2018-03-01 Magna powertrain gmbh & co kg Getriebe mit unterbrechungsfreier Schmierung
DE102019103877A1 (de) 2019-02-15 2020-08-20 Joma-Polytec Gmbh Pumpvorrichtung für ein Getriebe und Getriebe mit einer solchen Pumpvorrichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4529061A (en) * 1984-01-23 1985-07-16 Deere & Company Fluid level control system
CH675758A5 (fr) * 1987-04-02 1990-10-31 Walter Baiker Dipl Ing
US4915193A (en) 1989-07-03 1990-04-10 Deere & Company Air/oil level control for transmission lubrication
DE10132739A1 (de) * 2001-07-05 2003-01-16 Deere & Co Entlüftungseinrichtung für ein Getriebegehäuse
SE530965C2 (sv) * 2007-03-02 2008-11-04 Scania Cv Abp Smörjanordning, växellåda och sätt att smörja en växellåda
DE102008055632B4 (de) * 2008-11-03 2012-05-16 Aerodyn Engineering Gmbh Verfahren zur Schmierung eines Getriebes
DE102009045426A1 (de) * 2009-10-07 2011-04-14 Zf Friedrichshafen Ag Anordnung zum Ausgleich von Ölniveaus in Gehäuseteilen eines Getriebes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013087292A1 *

Also Published As

Publication number Publication date
DE102011088363A1 (de) 2013-06-13
WO2013087292A1 (fr) 2013-06-20

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