DE102010047515B4 - Power transmission device - Google Patents

Abstract

Power transmission device (I) with a housing (10) in which several pairs of meshing gears (16, 18) are mounted, which form different gears of the power transmission device, an oil sump (20) being arranged in a lower part of the housing (10). and an area of the housing is exposed to oil splashes during operation of the gears of the power transmission device (I) by lower gears (18) of the gears immersed in the oil (O) in the oil sump (20), the oil level (L1, L2) in the oil sump (20 ) is regulated during gear shifting movements with oil level regulating means (100; 300), at least one of which is arranged on a switching element (22, 24; 22) which moves during gear shifting movements and thereby directs oil, characterized in that an oil collecting tank (30). the housing (10) is connected, which has an upper oil inlet (32) in the area of the housing, which, during operation of the gears of the power transmission device, causes oil splashes due to lower gears (18) of the gears immersed in the oil (O) in the oil sump (20). is exposed, and has a lower outlet (34) for returning the oil (O) collected in the tank to the oil sump (20), the above-mentioned oil level regulating means (100; 300) serves to feed the oil to the above-mentioned upper oil inlet (32).

Description

TECHNICAL PART

The subject of the invention is a power transmission device for a motor vehicle according to the preamble to claim 1. The invention also relates to a motor vehicle.

BACKGROUND

In conventional gearboxes/power transmission devices, the lower gears in the various gears in the transmission normally rotate with their peripheral portion immersed in the oil in the oil sump in the gearbox housing to lubricate and cool the loaded gears in the various gears during operation . In direct operation, i.e. H. However, when the input shaft and the output shaft of the transmission are coupled to each other in a gear ratio of 1:1, the lower gears in the affected gear are not loaded, so that direct lubrication and cooling of these gears is not required. When these gears are immersed in the oil in the oil sump, energy is consumed due to immersion losses. Since more than 90% of the driving takes place in direct gear mode, these losses due to rotational resistance are large in the long term.

One way to reduce such immersion losses is to use a “dry sump,” whereby oil is pumped from a storage tank located below and used to spray the effective gears. The dripping oil can then flow back into the tank through openings in the bottom of the sump. This requires the use of an energy-consuming pump and special nozzles for spraying the gears.

SE 530 695 C2 describes a transmission in which the normal oil level for operation with the gears of the transmission in direct gear operation is temporarily reduced to a level at which the lower gears in the affected gear rotate essentially without contact with the oil in the oil sump. When you shift into another gear, the oil level is raised back to normal. For this purpose, the transmission housing is connected to an oil collection tank which has an upper oil inlet in the area of the housing which, when operating with gears of the transmission, is exposed to oil splashes from the lower gears immersed in the oil sump, and a lower outlet for returning the oil in the tank collected oil to the oil sump. The outlet can be closed in direct gear operation to lower the oil level and has a valve unit that can be controlled between an open and a closed state depending on the operating position of the transmission.

A problem with such a solution is that, for example, in the event of a cable break or other trouble with the valve unit, it gets stuck in the open or closed position, with the oil level regulation function not working, which can lead to increased energy consumption in direct operation when the valve unit remains open, or This means that there is no lubrication and cooling of the loaded gears during the transition from direct gear operation to engaging a gear because the valve unit remains closed so that the oil level does not increase to the normal level.

JP 2009 - 180 281 A , DE 10 2007 021 686 A1 and DE 60 2006 000 814 T2 each disclose power transmission devices according to the preamble of claim 1.

OBJECT OF THE INVENTION

An object of the present invention is to achieve a power transmission device which enables the oil level in the oil sump of this power transmission device to be regulated in various operating positions in a robust and reliable manner.

SUMMARY OF THE INVENTION

These and other objects that emerge from the description below are achieved by a power transmission device and a motor vehicle of the type specified at the outset, which also has the features specified in the characterizing part of the appended independent claims 1 and 9.

Preferred embodiments of the power transmission device are described in the appended dependent claims 2-8.

According to the invention, the objects are achieved by means of a power transmission device having a housing in which a plurality of pairs of meshing gears are mounted corresponding to different gears of the power transmission device, an oil sump being arranged in a lower part of the housing and a portion of the housing in operation the gears of the power transmission device are exposed to oil splashes from lower gears of the gears immersed in the oil in the oil sump. The oil level in the oil sump is regulated during gear shifting movements by an oil level regulating agent is formed from switching elements that move during the switching movements.

This enables the oil level in the oil sump of the power transmission device to be regulated in a robust and reliable manner in various operating positions. Consequently, the oil level can be controlled in a robust and reliable manner and without electrical influence in the gear shifting movement for operation in different gears so that when operating in gears with low load on the gears, the oil level is lower so that the lower gears can rotate with less resistance and if necessary, for example in direct gear operation, can rotate essentially without contact, and that when the gears are under high load, the oil level is higher, so that the lower gears can spray oil to lubricate and cool the loaded gears. When changing gears, for example from direct gear or from gears with low gear load to gears with high gear load, the oil level increases so that the loaded gears can be lubricated and cooled.

According to an embodiment of the power transmission device, the above-mentioned gears include a direct gear between an input shaft and an output shaft, wherein the above-mentioned oil level regulating means is formed in the direct gear movement. As a result, the oil level during the gear shifting movement for direct gear operation can be lowered robustly and reliably and without electrical influence, so that the lower gears can rotate essentially without contact in direct gear operation. Furthermore, the oil level can be increased when engaging gears so that the loaded gears can be lubricated and cooled.

According to an embodiment of the power transmission device, the above-mentioned oil level regulating means includes a first element which is arranged on a first switching element. By arranging an element on a switching element that moves during the gear shifting movement, steering and/or collection of oil is made possible, for example in direct gear operation.

According to an embodiment of the power transmission device, the above-mentioned oil level regulating means includes a second element which serves to form the above-mentioned oil level regulating means together with the above-mentioned first element. As a result, the first and second elements can, for example, form a composite element in direct gear movement, which directs and / or collects oil in direct gear operation, whereby the oil level drops so that the lower gears can rotate essentially without contact.

According to an embodiment of the power transmission device, the above-mentioned second element is arranged on a second switching element. As a result, the above-mentioned oil level regulating means is formed in that the switching elements and consequently the first and second elements move relative to one another during the gear shifting movement, so that the oil level is lowered when the direct gear is engaged. This results in a simple formation of a steering element of the two elements by using switching elements which, for example, move closer to one another during direct gear movements to engage the direct gear.

According to an embodiment of the power transmission device, the above-mentioned second element is fixedly arranged in the housing. As a result, the above-mentioned oil level regulating means is formed by the element arranged on the switching element moving relative to the fixed element. Thus, an element can, for example, be arranged fixedly in the power transmission housing, with the first element connected to the switching element, for example during the direct gear movement for direct gear operation, moving relative to the fixedly arranged element, so that an oil level regulating means for steering and / or collecting oil is formed and that Oil level drops. This results in fewer moving elements.

According to an embodiment of the power transmission device not according to the invention, the above-mentioned oil level regulating means serves to form a collecting device. This eliminates the need for a separate collection tank to which the oil is directed, allowing for a more compact solution because the collection container formed is located in the power transmission housing.

According to an embodiment of the power transmission device, the above-mentioned oil level regulating means serves to constitute a steering device. This allows the oil to be directed away in direct gear operation, for example, so that the oil level drops during the transition to direct gear operation.

According to the invention, an oil collection tank is connected to the housing, which has an upper oil inlet in the area of the housing which, during operation, in the gears of the power transmission device is exposed to oil splashes from lower gears of the gears immersed in the oil in the oil sump, and a lower outlet for Return of the of oil collected in the tank into the oil sump, the above-mentioned oil level regulating means serving to direct the oil to the above-mentioned upper oil inlet. This enables an efficient way of removing oil in direct operation.

According to an embodiment of the power transmission device, the above-mentioned oil inlet, the above-mentioned outlet and the above-mentioned oil level regulating means are designed such that the oil outflow capacity through the outlet in direct operation is less than the oil inflow capacity through the oil inlet. This means that there is no need to close the outlet that can be opened, such as a valve or the like.

ILLUSTRATION DESCRIPTION

• zeigt schematisch eine Seitenansicht eines Kraftfahrzeuges;
• zeigt schematisch einen Querschnitt durch eine Kraftübertragungsvorrichtung gemäß einer ersten Ausführungsform der Erfindung in einer statischen Ruheposition;
• zeigt schematisch die Kraftübertragungsvorrichtung gemäß bei gerade eingelegtem Direktgang;
• zeigt schematisch die Kraftübertragungsvorrichtung gemäß in einer späteren Betriebsposition, wobei das Ölniveau im Ölsumpf der Kraftübertragungsvorrichtung abgesenkt ist;
• zeigt schematisch einen Querschnitt durch eine Kraftübertragungsvorrichtung gemäß einer nicht beanspruchten Ausführungsform;
• zeigt schematisch eine Draufsicht eines Ölniveauregulierungsmittels der Kraftübertragungsvorrichtung gemäß der ersten Ausführungsform in in einer inaktiven Position und
• zeigt einen Schnitt A-A des Ölniveauregulierungsmittels in ;
• zeigt schematisch eine Draufsicht des Ölniveauregulierungsmittels in in einer aktiven Position und
• zeigt einen Schnitt A-A des Ölniveauregulierungsmittels in ;
• zeigt schematisch eine Draufsicht eines Ölniveauregulierungsmittels der Kraftübertragungsvorrichtung gemäß der nicht beanspruchten Ausführungsform in in einer inaktiven Position und
• zeigt einen Schnitt B-B des Ölniveauregulierungsmittels in ;
• zeigt schematisch eine Draufsicht des Ölniveauregulierungsmittels in in einer aktiven Position und
• zeigt einen Schnitt B-B des Ölniveauregulierungsmittels in ;
• zeigt schematisch eine Draufsicht eines Ölniveauregulierungsmittels gemäß einer zweiten Ausführungsform der vorliegenden Erfindung in einer inaktiven Position und
• zeigt einen Schnitt C-C des Ölniveauregulierungsmittels in ; und
• zeigt schematisch eine Draufsicht des Ölniveauregulierungsmittels in in einer aktiven Position und
• zeigt einen Schnitt C-C des Ölniveauregulierungsmittels in .

The present invention may be better understood from the following detailed description and the accompanying drawings. The same reference numerals refer to the same parts throughout the various views:

• shows schematically a side view of a motor vehicle;
• shows schematically a cross section through a power transmission device according to a first embodiment of the invention in a static rest position;
• shows schematically the power transmission device according to with direct gear currently engaged;
• shows schematically the power transmission device according to in a later operating position, with the oil level in the oil sump of the power transmission device being lowered;
• shows schematically a cross section through a power transmission device according to an unclaimed embodiment;
• shows schematically a top view of an oil level regulating means of the power transmission device according to the first embodiment in in an inactive position and
• shows a section AA of the oil level regulator in ;
• shows schematically a top view of the oil level regulating means in in an active position and
• shows a section AA of the oil level regulator in ;
• shows schematically a top view of an oil level regulating means of the power transmission device according to the unclaimed embodiment in in an inactive position and
• shows a section BB of the oil level regulating agent in ;
• shows schematically a top view of the oil level regulating means in in an active position and
• shows a section BB of the oil level regulating agent in ;
• shows schematically a top view of an oil level regulating means according to a second embodiment of the present invention in an inactive position and
• shows a section CC of the oil level regulating agent in ; and
• shows schematically a top view of the oil level regulating means in in an active position and
• shows a section CC of the oil level regulating agent in .

DESCRIPTION OF EMBODIMENTS

In a side view of a motor vehicle 1 is shown. The vehicle 1 in this example consists of a tractor unit 2 and a semi-trailer 3. The vehicle can be a heavy vehicle such as a truck or a bus. The vehicle can also be a passenger car. The vehicle 1 has a power transmission device according to one of the following embodiments.

The show schematically a cross section through a power transmission device I in different positions according to a first embodiment of the present invention and shows schematically a cross section through a power transmission device II according to an unclaimed embodiment.

shows schematically the power transmission device I in a static rest position, with direct gear currently engaged and in a later direct gear operating position in which the oil level in the oil sump of the power transmission device I was lowered.

The power transmission device I, II includes a housing 10 in which two parallel shafts 12, 14 equipped with gears, an upper main shaft 12 and a lower secondary shaft 14, are rotatably mounted. The main shaft 12 can have input and output shafts, not shown be coupled together at the ends of the power transmission device I, II. A plurality of gears for different gears of the power transmission device are mounted on the main axis, of which a gear 16 is shown, which is arranged to engage with the associated driving gear (drive wheel), which is mounted on the side shaft 14, of which a gear 18 is shown. That in the Gear pair 16, 18 shown forms one of several gears of the power transmission device I; II.

The power transmission device I, II includes an oil sump 20 arranged in the lower part of the housing 10. The lower gear 18 is immersed for a few centimeters in the oil O in the oil sump in order to lubricate and cool the gears in all gears during operation.

The power transmission device also includes switching elements such as switching forks, of which a switching element 22 is shown. The shift forks are used to move clutch sleeves, not shown, back and forth during a gear shift movement, so that different gears are engaged. The switching element 22 therefore serves to bring gears for the desired gear into engagement with one another when shifting gears, with a gear shifting movement being carried out. When engaging and disengaging the direct gear, a direct gear movement occurs, with the switching element 22 serving to move clutch sleeves back and forth so that the input shaft and the main shaft 12 of the power transmission device are coupled together and decoupled.

The term switching element here means any part of the power transmission device that moves with the gear shifting movement in different gears, such as direct gear. Shifting elements therefore include shift forks, control shafts connected to shift fingers used to act on the shift forks, shift pins, etc.

In order to significantly reduce the immersion losses, which also occur when the immersed gears rotate in direct gear mode and there is a direct power transmission between the input and output shafts with a gear ratio of 1:1 and the rotating gears in the gears are therefore not loaded, whereby Since lubrication and cooling are not required, the power transmission device according to the present invention has the oil level regulating means 100, 200 and 300 (see, for example, and .

The oil level in the oil sump 20 is regulated during direct gear movements with the above-mentioned oil level regulating means 100, 200 and 300, which are formed with the switching element 22 moving during direct gear movements, so that when the direct gear is engaged, the normal level L1 of the oil in the oil sump 20 is at a level L2 lowers, in which the lower side shaft drive wheel can rotate essentially without contact with the oil in the sump, with the oil level being returned to the normal level L1 as soon as a gear is engaged.

The power transmission device I according to the first embodiment in has an oil collection tank 30 which is connected to the power transmission housing 10 and has an upper oil inlet 32 in the area of the housing which, during operation of the gears of the power transmission device I, is exposed to oil splashes by the lower gear 18 of the gears immersed in the oil O in the oil sump 20 and has a lower outlet 34 for returning the oil O collected in the tank to the oil sump 20, the above-mentioned oil level regulating means 100 serving to supply the oil O to the above-mentioned upper oil inlet 32 in direct operation.

The and show schematically a top view or a section AA of the oil level regulating means 100 of the power transmission device I according to the first embodiment in , with direct gear not engaged, and the and show schematically a top view or a section AA of the oil level regulating agent in in direct gear operation, ie with direct gear engaged, so that the input shaft and the main shaft 12 are coupled together.

The oil level regulating means 100 of the power transmission device according to the first embodiment has a first element 110 arranged at a first switching element 22 and a second element 112 arranged at a second switching element 24.

The second element 112 serves to form the above-mentioned oil level regulating means 100 together with the above-mentioned first element 110. The first element 110 is connected to the first switching element 22 via a connection 110a and the second element 112 is connected to the second switching element 24 via a connection 112a and the elements are arranged so that they move during a direct gear movement, ie when the direct gear is engaged. by moving the switching elements relative to each other, so that they form a steering device 120 which is related on the upper oil inlet is arranged so that oil is directed through the oil inlet into the oil collection tank.

The lower gear 18 is used as a paddle wheel for transporting oil O from the oil sump 20 to the oil collection tank 30 located next to it, the oil inlet opening 32 of which is placed on the wall 11, which when the gear 18 rotates in the in direction shown is very exposed to oil splashes. The respective elements are preferably designed with such a curvature that, when they are brought together in direct operation, the supply of oil O to the oil collection tank is significantly improved.

The above-mentioned oil inlet 32, the outlet 34 and the first and second elements 110, 112 for directing the oil in the direct transmission operation are designed so that in the direct transmission operation, when the first and the second elements 110, 112 form a steering device 120, the oil outflow capacity through the outlet 34 is less than the oil inflow capacity through the oil inlet 32, the oil level in the oil sump drops to a level at which the lower gears can rotate essentially without contact.

As soon as a gear is engaged, the first element 110 and the second element 112 move away from each other due to the movement of the switching elements 22, 24, so that a gap is formed between them and the oil is not supplied to the oil collection tank 30 and the outflow capacity through outlet 34 is higher than the inflow capacity of the oil O through oil inlet 32, so that the oil level in the oil sump 20 rises to the level L1, whereby the lower gears 18 can cause oil splashes during rotation to lubricate and cool the loaded gears.

shows schematically a cross section through a power transmission device II according to an unclaimed embodiment. The power transmission device according to the unclaimed embodiment differs from the first embodiment, among other things, in that there is no oil collecting tank therein.

The and show schematically a top view or a section BB of the oil level regulating means 200 of the power transmission device II according to the unclaimed embodiment in , in which direct gear is not engaged, and the and show schematically a top view or a section BB of the oil level regulating means 200 in in direct gear operation, ie with direct gear engaged, so that the input shaft and the main shaft 12 are coupled together.

The oil level regulating means 200 of the power transmission device II according to the unclaimed embodiment shown in Figs , and shown has a first element 210 arranged on a first switching element 22 and a second element 212 arranged on a second switching element 24.

The second element 212 serves to form the above-mentioned oil level regulating means 200 together with the above-mentioned first element 210. The first element 210 is connected to the first switching element 22 via a connection 210a and the second element 212 is connected to the second switching element 24 via a connection 212a and the elements 210, 212 move during a direct switching movement, i.e. H. when direct gear is engaged, by moving the switching elements 22, 24 relative to each other so that they form a collecting device 220, which is arranged so that oil that is sprayed during rotation is collected in the collecting device 220 formed.

As soon as a gear is engaged, the first element 210 and the second element 212 are moved away from each other by the movement of the shift elements 22, 24, forming a gap between them, so that the oil O collected by the elements 210, 212 into the Oil sump 20 flows back down and no oil is collected by the elements 210, 212, the oil O flowing back into the oil sump 20 and the oil level in the oil sump rises to level L1, so that the lower gears produce oil splashes during rotation to lubricate and cool the loaded ones can create gears.

The and show schematically a plan view or a section CC of the oil level regulating means 300 of the power transmission device according to a second embodiment of the present invention, in which the direct gear is not engaged, and the and show schematically a top view or a section CC of the oil level regulating means 300 in in direct gear operation, ie with direct gear engaged, so that the input shaft and the main shaft 12 are coupled together.

The oil level regulating means 300 of the power transmission device according to the second embodiment shown in Figs and is shown, has a first element 310, which is arranged at a first switching element 22, and a second element 312, which is fixedly arranged in the power transmission housing 10 for example on a wall or on another fixed part of the power transmission housing 10.

The second element 312 serves to form the above-mentioned oil level regulating means 300 together with the above-mentioned first element 310. The first element 310 is connected to the first switching element 22 via a connection 310a and the second element 312 is firmly connected in the housing via a connection 312a, so that the first element 310 moves during a direct gear movement, ie when the direct gear is engaged, by the movement of the first switching element 22 moves to the fixed second element 312, so that the first and second elements together form a steering device 320 for oil. According to one variant, the oil is fed through the oil inlet into an oil collection tank, for example according to , directed.

Alternatively, in a direct motion movement, the first element 310 may be configured together with the fixed second element 312 according to an embodiment not according to the invention so that the two elements form a collecting device in which oil according to the function described with reference to , and is described is collected.

As soon as a gear is engaged, the oil level in the oil sump rises to level L1, with the lower gears spraying oil during rotation to lubricate and cool the loaded gears in the first embodiment according to , and . H. in the steering device, or in the unclaimed embodiment according to , and can generate.

Various embodiments of the oil level regulating means 100, 200 and 300 have been described above. The actual idea of the invention is to regulate the oil level in the oil sump during a direct gear movement with oil level regulating means which are formed by switching elements that move during gear shifting movements. Accordingly, any suitable oil level control means that utilizes gear shifting motions may be used.

According to a variant, a single element can be arranged on a switching element so that it is acted upon during the direct gear movement in direct gear operation and it forms a steering device which serves to direct the oil, for example, into a collecting tank. This can be achieved, for example, by the element rotating during the above-mentioned gearshift movement between an oil-directing position in direct gear operation and a passive position in other operation.

According to a variant not according to the invention, the first and second elements can form a collecting device in gear operation, into which oil is filled all the time during the rotation of the lower gears and which consequently overflows, so that the oil level is maintained and the loaded gears are lubricated and cooled become. According to an embodiment of the invention, the first and second elements can also be arranged so that they are acted upon during the direct gear movement, so that they form a steering device by forming an opening in the collecting device during the gear shifting movement through which oil flows, for example Channel into, for example, a separate collection tank is diverted so that oil that is filled into the collecting device is continuously drained and the oil level drops so that the lower unloaded gears can rotate essentially without contact.

The oil level regulating means according to embodiments of the present invention may be connected to the switching element in any suitable manner and may be spatially disposed at any suitable location in the housing of the power transmission device according to embodiments of the present invention.

Above, a direct gear power transmission device has been described with reference to figures. However, any power transmission device can be used to regulate the oil level in the oil sump based on gear shifting movements, with the oil level regulating means being formed during the gear shifting movement.

According to an embodiment of the present invention, the oil level regulating means is arranged on the shift element so that the steering of oil is based on gears, so that the oil level is regulated based on the load on the gears.

In gears where the load on the gears is low, the oil level regulating agent is formed during the gear shifting movement, so that the oil level is reduced considerably and only the oil required to lubricate and cool the lightly loaded gears is sprayed with the lower gears. In gears where the load on the gears is high, the oil level regulating agent is formed during the gear shifting movement, so that the oil level is essentially maintained and is required to lubricate and cool the heavily loaded gears Oil is sprayed with the lower gears. In the direct gear power transmission device, as described above, the oil level regulating means is formed in the gear shifting movement, so that the oil level is reduced and substantially no oil is splashed with the lower gears for lubrication and cooling of the substantially unloaded gears.

Here, several elements can belong to the oil level regulating means, which are arranged following different switching elements and have different effects on the gear shifting movements for engaging different gears, so that the oil level is regulated with the oil level regulating means on the basis of gear shifting movements, with gears with high loads on the gears lead to a high oil level and gears with low load lead to a low oil level.

Claims (9)

Power transmission device (I) with a housing (10) in which several pairs of meshing gears (16, 18) are mounted, which form different gears of the power transmission device, an oil sump (20) being arranged in a lower part of the housing (10). and an area of the housing is exposed to oil splashes during operation of the gears of the power transmission device (I) by lower gears (18) of the gears immersed in the oil (O) in the oil sump (20), the oil level (L1, L2) in the oil sump (20 ) is regulated during gear shifting movements with oil level regulating means (100; 300), at least one of which is arranged on a switching element (22, 24; 22) which moves during gear shifting movements and thereby directs oil, characterized in that an oil collecting tank (30). the housing (10) is connected, which has an upper oil inlet (32) in the area of the housing, which, during operation of the gears of the power transmission device, causes oil splashes due to lower gears (18) of the gears immersed in the oil (O) in the oil sump (20). is exposed, and has a lower outlet (34) for returning the oil (O) collected in the tank to the oil sump (20), the above-mentioned oil level regulating means (100; 300) serves to feed the oil to the above-mentioned upper oil inlet (32). Power transmission device according to Claim 1 , in which the above-mentioned gears include a direct gear between an input shaft and an output shaft, the above-mentioned oil level regulating means (100; 300) being formed during the direct gear shifting movement. Power transmission device according to Claim 1 or 2 , wherein the above-mentioned oil level regulating means (100; 300) includes a first element (110; 310) which is arranged at a first switching element (22). Power transmission device according to Claim 3 , wherein the above-mentioned oil level regulating means (100; 300) includes a second element (112; 312), which together with the above-mentioned first element (110; 310) forms the above-mentioned oil level regulating means (100; 300). Power transmission device according to Claim 4 , wherein the above-mentioned second element (112) is arranged at the second switching element (24). Power transmission device according to Claim 4 , wherein the above-mentioned second element (312) is fixedly arranged in the housing (10). A power transmission device according to any one of the preceding claims, wherein said oil level regulating means (100; 300) constitutes an oil steering device (120; 320). Power transmission device according to one of Claims 1 until 7 , wherein the above-mentioned oil inlet (32), the outlet (34) and the oil level regulating means (100; 300) are designed such that in direct operation the outflow capacity of the oil (O) through the outlet (34) is less than the inflow capacity of the oil (O) through the oil inlet (32). Motor vehicle with a power transmission device according to one of the above claims.

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