WO2018145963A1

WO2018145963A1 - Vehicle transmission with delimited fluid chamber

Info

Publication number: WO2018145963A1
Application number: PCT/EP2018/052321
Authority: WO
Inventors: Nico Gerhardt; Christian Anzt; Reiner Castan
Original assignee: GETRAG B.V. & Co. KG
Priority date: 2017-02-09
Filing date: 2018-01-31
Publication date: 2018-08-16
Also published as: CN110291311B; DE102017102527A1; CN110291311A; EP3580478A1

Abstract

The invention relates to a vehicle transmission (10) comprising a transmission housing (12), a plurality of shafts (20, 22, 24) which are rotatably mounted on the transmission housing (12), and a plurality of gear sets (25) which are mounted on the shafts (20, 22, 24). A fluid sump is formed in a base region of the transmission housing (12), and a fluid chamber (40) is arranged adjacently to the fluid sump (30), said fluid chamber being bound from the fluid sump (30) and being designed to receive fluid from the fluid sump (30) and stir the received fluid. The fluid chamber (40) is open towards the top and has a fluid inlet portion (B) via which fluid can enter from the top into the fluid chamber (40). The fluid inlet portion (B) is equipped with a fluid stirring device (66) which stirs fluid entering the fluid inlet portion (B) from the top before the fluid flows further in the direction of a base portion (A) of the fluid chamber (40).

Description

Vehicle transmission with delimited fluid space

The present invention relates to a vehicle transmission having a transmission housing, with a plurality of shafts, which are rotatably mounted on the transmission housing, and with a plurality of wheelsets, which are mounted on the shafts, wherein formed in a bottom region of the transmission housing, a fluid sump with a fluid space adjacent to the fluid sump being defined from the fluid sump and configured to receive fluid from the fluid sump and calm the fluid ingested.

Such a vehicle transmission is, for example, from the document DE 103 08 560 B4 known. In this known vehicle transmission, a container is arranged laterally next to the oil sump within the transmission housing, which serves as an oil reservoir for a hydraulic arrangement, wherein the transmission housing has a arranged next to the oil sump, high-level partition, behind which on the transmission housing, a housing opening is formed, which a cover is closed, and wherein the container is open at the top and is filled through the upper opening with spray oil.

From the document DE 100 62 550 A1 a lubricating oil circuit of an internal combustion engine is known, with a refill container which is connected via a refill line and a return line to the lubricating oil circuit. In the refill line is arranged depending on the amount of oil in the lubricating oil circuit controlled actuator. The return line for returning lubricating oil in the refill and the refill line are matched together with the actuator so that, if necessary, the oil flow through the refill line is greater than the oil flow through the return line.

[0004] Document DE 100 51 356 A1 discloses a transmission of a reciprocating internal combustion engine with an oil sump and an oil pump associated with the oil sump for a main oil circuit, wherein at least one additional oil reservoir is associated with the oil sump and is operatively connected to the oil pump.

From the document DE 10 214 107 659 A1 a transmission for a motor vehicle is known, in which a Fluidbeaufschlagungssystem has a pump and a fluid sump and at least one fluid reservoir. The fluid reservoir includes a first fluid drain into the fluid sump. The first fluid drain is controllable depending on a state variable.

The document DE 10 215 107 815 A1 discloses a further transmission for a motor vehicle, wherein the transmission has a Fluidbeaufschlagungssystem. The fluid delivery system includes at least one fluid sump. The transmission has a first clutch. The fluid delivery system includes at least a first fluid delivery device configured to controllably apply fluid from the fluid sump to the first clutch. The first Fluidbeaufschla- device has at least a first leakage and at least a first pump. The first pump is operable in at least one pumping direction and in at least one suction direction. The first leakage includes at least a first fluid reservoir. The first fluid reservoir is arranged to suppress suction of air during operation of the first pump in the suction direction.

Against this background, it is an object of the invention to provide an improved motor vehicle transmission. The above object is achieved in the vehicle transmission mentioned above in that the fluid space is open at the top and has a fluid inlet portion, can enter through the fluid from above into the fluid space, wherein in the fluid inlet portion, a fluid calming means is arranged, from the top Fluid entering the fluid inlet section calms before proceeding toward a bottom portion of the fluid space.

By the measure to calm the entering into the fluid space fluid in an upper fluid inlet portion before it enters the bottom portion of the fluid space, the incoming fluid can be even better calmed and possibly degassed.

The fluid calming means is preferably adapted to decelerate the entering fluid and guide it preferably to pass from the fluid calming means along inner walls of the fluid space into the bottom portion of the fluid space. In particular, it is achieved by the fluid calming device that the fluid substantially does not drip into the bottom section but, for example, can flow into the bottom section on a side wall, so that fluid located in the bottom section is not unnecessarily swirled or foamed.

In the bottom portion of the fluid space is preferably a suction of fluid by means of a pump. By the measure that the bottom area is particularly calm and the fluid contained therein is degassed, it can be ensured that the fluid drawn in by the pump is well suited for subsequent use in a hydraulic arrangement, for example for actuating a clutch or for actuating transmission components. For a foamed fluid can lead to pressure irritation, which may be disadvantageous especially in a pressure control, as it is preferably used in the actuation of a clutch of a motor vehicle transmission.

The bottom portion of the fluid space is preferably sealed from the fluid sump and preferably defines a minimum fluid level or a Minimum level of fluid within the fluid space. The minimum level is preferably arranged below the fluid inlet section.

In general, it is also possible that the fluid space is sealed to above the fluid inlet portion relative to the fluid sump.

Overall, it can be achieved that a separate fluid space, which is preferably formed high and narrower above, is selectively fillable. The fluid contained in the fluid space can be calmed and degassed by design measures, in particular a calming device.

The minimum level within the fluid space is preferably higher than a level at which suction of fluid by a pump occurs.

Generally, more fluid can be introduced into the overall system through the fluid space, if necessary, without a fluid level in the fluid sump rising and leading to splashing losses.

Rather, can be achieved by the fluid space, if necessary, that during operation, a level of the fluid sump below the wheelsets, so that no splashing losses occur.

The terms "top" and "bottom" are present to be understood that the gravitational force is directed from top to bottom. The term "open-topped" thus means that fluid, which is arranged in the region of the opening of the fluid space, drips down due to gravity.

The term fluid calming refers to either decreasing the velocity of fluid in that region and / or reducing chaotic movements of the fluid within that region, particularly in comparison to the fluid condition above the fluid inlet portion. The fluid calming device is preferably designed so that the fluid entering in the direction of the fluid space is maze-like at least once, preferably at least twice and more preferably at least three times deflected before it enters the bottom portion of the fluid space. Particularly preferred is a helical or cyclotron-like guidance of the fluid within the fluid calming device, wherein the fluid is deflected at least once, preferably at least twice and more preferably at least three times before it reaches the bottom portion of the fluid space.

The deflection of the fluid can be carried out substantially in a radial plane. In a further embodiment, the deflection of the fluid takes place in the axial direction, that is to say in such a way that the fluid flows once in an axial direction and once in an opposite axial direction. Particularly preferred is a combination of a radial and an axial deflection, such that a kind of cyclotron-like guidance of the fluid takes place.

Overall, it is preferably possible by means of the fluid calming device, to keep a "foam crown" of the fluid in the bottom portion of the fluid space low. Preferably, the surface of the fluid in the bottom section is largely calm and little foamed.

In general, it is further preferred if a leakage return is arranged so that it can not lead to a turbulence of the calmed area, so preferably outside of the "foam crown".

A hydraulic system for lubricating the wheelsets and / or for lubricating bearings of the wheelsets may be designed in particular as injection lubrication, wherein fluid sucked by a pump and then directed via channels towards bearings and / or points of engagement of the wheelsets.

The object is thus completely solved. According to a particularly preferred embodiment, the fluid calming device has a plurality of ribs which protrude into the cross section of the fluid inlet section.

The cross section of the fluid inlet section corresponds to a section through the fluid inlet section in a direction transverse to a gravitational direction. Preferably, the cross section is provided in the horizontal direction. By the ribs can be achieved that the entering into the fluid space fluid is calmed down before it reaches the bottom portion of the fluid space.

It is preferred if the plurality of ribs have at least one first side rib, which protrudes from one side of the fluid inlet portion in the cross section of the fluid 'inlet portion, and at least one second side rib, which from an opposite side of the fluid inlet portion in protrudes the cross section of the fluid inlet portion.

In this way it can be achieved that a calming of the fluid can be achieved largely independently of the entry angle at which the fluid enters the fluid inlet section from above.

In this case, it is further particularly preferred if the first side rib and the second side rib overlap such that a predominant part, in particular the entire part, of the cross section of the fluid inlet section is covered in an axial plan view by the first and / or the second side rib is, wherein particularly preferably due to the overlap of the first side rib and the second side rib, a bottom portion of the fluid space in an axial plan view of the fluid inlet portion is not visible from above.

In this way it is achieved that fluid can not get directly from above the fluid inlet portion in the bottom portion of the fluid space, so not on a direct "trajectory". Rather, can be achieved by such a trained Fluidbehuhigungseinrichtung that the fluid catches on the side ribs and then flows down from the side ribs targeted down into the bottom area or flows. The downflow into the bottom region can take place at a lower velocity of the fluid than in the case where the fluid could pass directly from above the fluid inlet section into the region of the bottom section.

According to another preferred embodiment, at least one rib of the plurality of ribs extends obliquely upward from the side of the fluid inlet portion, so that the rib forms a fluid groove.

As a result of this measure, an accumulation of fluid already takes place in the area of fluid control, which consequently can already degas in the area of the fluid calming device. Separated gas bubbles and / or foam can escape through its own buoyancy upwards. Preferably, the - partially or completely degassed - fluid then flows out of the channel, in which it flows over an edge of the channel and then passes along a side wall of the fluid space in the bottom portion.

Furthermore, it is altogether advantageous if at least one rib is arranged offset in the axial direction to at least one further rib, such that fluid entering the fluid calming device is deflected at least once in the axial direction.

The ribs can be inclined relative to a horizontal plane and a longitudinal axis in order to achieve the axial deflection targeted.

It is particularly preferred if the fluid calming device is designed so that the fluid is deflected at least once in the axial direction and at least once in the radial direction, that is, within a radial plane, so that a kind cyclotron-like labyrinth guide is achieved. Further, it is generally advantageous if at least one rib is associated with a gear housing portion of the gear housing, wherein at least one further rib is associated with a coupling housing portion of the gear housing.

In particular, in an axially staggered arrangement of these ribs Fluidberuhigungseinnchtung this be constructively low realized, since the Fluidberuhigungseinnchtung then composed of sections that are made separately, so for example, a gear housing section and a coupling housing portion of the gear housing, wherein the gear housing section and the Clutch housing section are screwed together via a sealing flange.

According to a further preferred embodiment, which constitutes a separate invention in conjunction with the preamble of claim 1, the fluid space has a fluid inlet section, which has a fluid inlet section cross section, wherein the fluid space above the fluid inlet section has a collecting section, which has a collecting cross section has, which is larger than the fluid inlet portion cross-section.

In this way it can be achieved that a relatively large opening for receiving fluid from that region of the transmission housing can take place, which is associated with the fluid sump.

In other words, a relatively large amount of spray fluid can be taken from the fluid sump region, which is collected via the relatively large collecting section and then enters the narrower or smaller cross-section fluid inlet section.

In this embodiment, which represents a separate invention in conjunction with the preamble of claim 1, a Fluidberuhigungseinnchtung be realized without ribs. Preferably, the ribs can be omitted if a quick filling of the fluid space is required. In case of an omission of the ribs is through a fluid calming device preferably ensures that the oil, together with its optionally present "foam crown", already leads to calming, preferably by a correspondingly selected vertical height of the fluid space.

It is preferred if the fluid space has a bottom portion which has a bottom cross section which is larger than the fluid inlet portion cross section.

In this way it can be achieved that a relatively large volume of fluid is provided in the region of the bottom portion, whereas an entry into the fluid space can be made exclusively via a relatively small cross section, which is defined by the fluid inlet portion.

It is preferred if the bottom cross section is larger than the collecting cross section. However, in some embodiments, the collecting cross-section may be larger than the bottom cross-section.

Further, it is advantageous if the fluid space is bounded above by a sieve.

In this case, it can be achieved that only "clean", ie. sifted fluid passes.

In this way, the functionality of a pump can be further increased, which sucks fluid from the bottom portion of the fluid space.

[0049] In general, the fluid space can be filled to at least one of the following filling possibilities: from above via spray fluid and / or in a region below a minimum fill level of the fluid space by means of fluid from a fluid supply device. The filling from above via spray fluid can be assisted, for example, by arranging a so-called fluid planer or a fluid catcher in an upper region of the transmission housing, by means of which fluid spraying upwards in the process is directed into the fluid space or into the fluid space ., In the region of the collecting portion of the fluid space can be performed.

The other possibility of filling is preferably carried out in a region below the minimum level of the fluid space, by means of fluid from a fluid supply device.

The fluid from the fluid supply device may be in particular from an actuator and / or a lubrication arrangement of a hydraulic system recycled fluid, but may also be leakage fluid, for example, from pumps, diaphragms, etc. is returned.

In general, the fluid space can be formed in various ways, for example. Through its own container which is inserted into the transmission housing and the example. Can be made of a plastic or a metal. In general, however, it is also conceivable to form the fluid space through a portion of the gear housing and by an externally attached to the gear housing component. In this case, it is preferable if the fluid space formed outside of the transmission housing is connected via corresponding interfaces with the housing interior or other components of the vehicle transmission.

It is of particular advantage if the fluid space is formed by the transmission housing and at least one fluid space side wall inserted into the transmission housing.

As a result, the fluid space can be formed in a simple manner. In some cases, the fluid space side wall may also be formed by a part of the transmission housing, that is to say be formed in one piece with the transmission housing. The fluid space side wall, as well as, for example, a container which is provided inside or outside of the transmission housing, be made of plastic, or of a metal material.

Overall, it can be achieved that possibly more fluid is introduced into the system without a fluid level in a wheel set area increases during operation, since the fluid space can accommodate additional fluid volume. The result is preferably an increase in robustness against high gas fractions (air fractions) or degrees of foaming of the transmission fluid. In this way, an improvement of the controllability can be achieved, possibly an improvement of the function and the comfort in all driving situations, provided that the fluid sucked from the fluid space is used, for example, for an actuator of a clutch or transmission components. Furthermore, there may be a reduction in oil aging due to a lower proportion of air in the tribulogical system. Furthermore, if necessary, an improvement in the service life of pressure sensors in the same hydraulic circuit can be achieved since pressure sensors may possibly experience pressure peaks due to gas bubbles (air bubbles).

The vehicle transmission may in particular be an automated vehicle transmission, but may also be a transmission with a manual circuit. In an automated transmission, the vehicle transmission may be an automated manual transmission with a single disconnect between an internal combustion engine and the actual transmission. However, the drive motor may also include an electric drive unit, either as a pure electric vehicle or as a hybrid vehicle. Furthermore, the vehicle transmission may be a dual-clutch transmission. It is preferred if a hydraulic arrangement has a pump which sucks fluid from the bottom section of the fluid space. The hydraulic arrangement preferably includes an actuator for actuating transmission components, such as. Clutches, and / or an actuator for actuating at least one clutch, which is arranged as a starting and separating clutch in front of the vehicle transmission and is preferably received in a portion of the transmission housing.

It is understood that the features mentioned above and those yet to be explained not only in the combination specified in each case, but also in other combinations or alone, without departing from the scope of the present invention.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:

Fig. 1 is a schematic cross-sectional view of a vehicle transmission according to

an embodiment of the invention.

Fig. 2 is a schematic cross-sectional view of a vehicle transmission according to

a further embodiment of the invention.

In Fig. 1, a motor vehicle transmission 10 is shown in schematic form, which may be an automated transmission or a dual-clutch transmission, to give examples.

The vehicle transmission 10 has, in a manner known per se, a transmission housing 12 which has a lower side 14 and an upper side 16. The transmission housing 12 is formed as a multi-part housing. 1 shows an axial plan view of a part of the transmission housing which can be connected to another part of the transmission housing by means of a flange 18, for example with a transmission housing cover.

In the gear housing 12, an input shaft assembly 20 is rotatably mounted, which may be, for example, a single input shaft, but also by two shafts (inner shaft and hollow shaft) may be formed when the motor vehicle transmission 10 has a dual-clutch transmission. Further, a first output shaft 22 and a second output shaft 24 are rotatably supported in the transmission housing 12. The shafts 20, 22, 24 are connected to each other via wheelsets, as is known per se, wherein the wheel sets are preferably switchable by means of clutches in the power flow in order to switch in this way, gear stages of the vehicle transmission 10. The vehicle transmission 10 preferably has five and more forward gear ratios and at least one Reverse gear on. The vehicle transmission 10 preferably has exactly 6, 7, 8 or 9 forward gear speeds.

The output shafts 22, 24 are coupled to a differential 26 received in the transmission housing 12. The differential 26 is in turn coupled to output shafts 28, thus serving to distribute the power absorbed to these output shafts 28, as is known per se in the prior art.

In the gear housing 12, a fluid 29 is contained and forms a fluid sump 30 in a bottom portion of the gear housing 12. In Fig. 1, a sump level is shown at 32, which are arranged in a resting state of the vehicle transmission 10 above a lowermost portion of the wheelsets can. In operation, the sump level 32 is preferably located below the lowermost portion of the wheelsets. The differential 26 is preferably sealed from the fluid sump 30. In the differential 26 may be a separate fluid sump, but it may also be a separate fluid contained therein, which does not come into contact with the fluid 29 from the fluid sump.

In the transmission housing 12, a fluid space 40 is further formed. The fluid space 40 is delimited from the fluid sump 30 and serves to receive fluid from the fluid sump, in order to lower the sump level 32 during operation. On the other hand, the fluid space 40 serves to calm fluid, such that fluid from the fluid space 40 can be sucked in by a hydraulic arrangement.

The fluid space 40 is presently limited by a bottom portion 41 which is formed by the transmission housing 12. Furthermore, the fluid space 40 is limited by a first side wall portion 42, which is also formed by the transmission housing 12. A second side wall portion 44, which is arranged at a distance from the outer wall of the transmission housing 12, may be formed as part of the transmission housing 12, that is, for example, so that it may be integrally cast. However, the second side wall portion 44 may also be formed by a separate component which is inserted into the transmission housing 12. Further, a rear wall portion 46 is shown schematically in Fig. 1, which may be formed, for example, by a transverse to the shafts 20, 22, 24 extending wall of the transmission housing. Another wall section may, for example, be formed by a gear cover or the like, which is not shown in FIG. 1, however.

The second side wall portion 44 extends from the bottom portion 41 initially over a first relatively short vertical portion 48 upwards. The first vertical section 48 then merges into a first horizontal section 50 that is oriented toward the first side wall section 42. The first horizontal section 50 merges into a second vertical section 52 that is parallel to the first side wall section 42 or that is tapered therewith. The second vertical portion 52 is further connected to a second horizontal portion 54 extending from the second vertical portion 52 in the direction away from the first side wall portion 42.

The second horizontal section 54 forms an upper side of the fluid space 40 and consequently defines a maximum level 56 of the fluid space 40.

The fluid space 40 is divided by the side wall portions 42, 44 in the vertical direction into a bottom portion A, a fluid inlet portion B and a catching portion C. The catching portion C starts from the top of the fluid space 40 and is substantially defined in cross section by the second horizontal portion 54. Starting from the collecting section C, the cross section of the fluid space 40 tapers in the direction towards the fluid inlet section B whose cross-section is smaller than the cross section of the collecting section C.

Starting from the fluid inlet section B, the cross section of the fluid space 40 increases again, since the cross section of the bottom section A is generally larger than the cross section of the fluid inlet section B.

FIG. 1 also shows that, within the bottom section A of the fluid space 40, a first pump suction point 58 and a second pump suction point 58 are provided. point 60 are arranged. Furthermore, a leakage return 62 is arranged within the bottom section A, via which, for example, leakage fluid can flow directly back from a diaphragm arrangement of a hydraulic arrangement or from a pump into the fluid space 40. Since the fluid contained in the hydraulic system, which is obtained as a leakage fluid, is not interspersed with gas, this leakage fluid can be introduced directly into the bottom portion A of the fluid chamber 40, without there could come to an accumulation of gas or the like. In addition, the leakage quantities are relatively small, so that no turbulence or other disturbance of the fluid within the bottom section A can be caused.

Preferably, the Pumpenansaugpunkte 58, 60 and the leakage return 62 are below a minimum level 64 of the fluid chamber 40. The minimum level 64 is defined by a level of the fluid chamber 40, which is not exceeded in any normal operation of the vehicle transmission. Above the minimum level 64, for example, an overflow opening 65 can be provided in the second side wall section 44, via which fluid, which rises above the minimum level 64, can be guided back into the fluid sump 30. However, the overflow opening 65 may also be omitted and an overflow may be formed solely by the upper edge of the second side wall portion 44, in particular by the upper edge of the collecting section C.

In the fluid inlet section B, a fluid calming device 66 is arranged, which in the present case is designed as a rib calming device.

The fluid calming device 66 has a plurality of stacked first ribs 68 extending from the second sidewall portion 44 into the fluid inlet portion B, at an angle a, for example, in a range 5 ° to 70 ° can lie. Furthermore, the fluid calming device 66 includes a plurality of second ribs 70, which are arranged in the vertical direction, as well as the ribs 68, staggered thereto one above the other. The second ribs 70 also extend obliquely upward at an angle β, which may be equal to the angle α or which may be in a similar range. The second ribs 70 extend from the first sidewall portion 42 into the fluid inlet portion B, toward the first sidewall portion 42.

The first ribs 68 and the second ribs 70 overlap in an overlap region 72 such that a predominate or, preferably, an entire portion of the cross-section of the fluid entry section B in an axial plan view from the first ribs 68 and / or the second ribs 70 is covered.

In Fig. 1 it can be seen that during operation of the motor vehicle due to the directions of rotation of the shafts 20, 22 spray oil 76 is sprayed upward. This spray oil passes in an area above the collecting section C. Optionally, this can be supported by a fluid planer 78, which is indicated schematically in Fig. 1.

The catching portion C may be defined upwardly by a fluid sieve 80 such that the fluid entering the catching portion C is first screened and thus cleaned before entering the catching portion C.

In an alternative embodiment of the vehicle transmission shown in Fig. 1, the ribs 68, 70 can also be omitted. In this variant, it is particularly preferable that the catching portion C in a vertical plan view has a larger cross section than a middle fluid calming portion B. Further, it is preferable that the bottom portion A of the fluid space 40 has a larger cross section in vertical plan view than the fluid inlet portion B. in that the collecting section C has a larger cross section above the fluid inlet section B and a bottom section A in turn has a larger cross section than the fluid inlet section B.

Fig. 2 shows an alternative embodiment of a vehicle transmission, which generally corresponds in construction and operation of the embodiment shown in Fig. 1. The same elements are therefore identified by the same reference numerals. The following section essentially explains the differences. 2, the transmission housing 12 is composed of a gear housing section 2A and a coupling housing section 12B, wherein these housing sections 12A, 12B are interconnected via a circumferential flange. The clutch housing portion 12B and the gear housing portion 12A are in the axial direction one behind the other, so that the flange portion is oriented substantially radially.

Furthermore, the fluid inlet section B comprises a fluid calming device 66 'in the form of a calming rib arrangement, which has at least one rib 68' which is arranged in the axial direction offset to at least one further rib 70 ', such that the fluid calming device 66' is arranged in the fluid calming device 66 '. entering fluid is deflected at least once in the axial direction.

The rib 68 'and the rib 70' are preferably assigned to different housing sections, so for example, the rib 68 'the coupling housing portion 12 B, and another rib 70' the gear housing portion 12 A.

As shown in FIG. 2, the fluid introduced into the fluid calming section B winds cyclotronically in the direction of the bottom section A, preferably over curved surfaces, so that a good venting of the air flowing away via the ribs is achieved Fluids is achieved.

The ribs 68 ', 70' may each be formed as straight ribs, but are preferably curved ribs, which may for example also be formed by curved housing sections.

It is further shown in FIG. 2 that a rib 70 'extends to the upper end of the fluid inlet section B, such that this rib 70' defines a maximum level 56 ', up to which fluid can be introduced into the fluid space 40. Subsequently, the fluid begins to overflow over the upper edge of the rib 70 'into the fluid sump 30, as shown by a further arrow in Fig. 2. Accordingly, the top edge the rib 70 'in Fig. 2 with 65', since this rib then forms a kind of overflow opening.

As mentioned, at least one rib is preferably formed by the gear housing portion 12A, and at least one further rib by the coupling housing portion 12B. As a result, the individual housing sections can be made structurally simpler, by simpler molds, to give an example.

Claims

claims

A vehicle transmission (10) comprising a transmission housing (12) having a plurality of shafts (20, 22, 24) rotatably supported on the transmission housing (12) and a plurality of wheelsets (25) attached to Shafts (20, 22, 24) are mounted, wherein in a bottom region of the transmission housing (12) a fluid sump (30) is formed, wherein adjacent to the fluid sump (30), a fluid space (40) is arranged, of the fluid sump (30 ) and adapted to receive fluid from the fluid sump (30) and calm the fluid received, characterized in that the fluid space (40) is open at the top and has a fluid inlet section (B) above the fluid from above into the fluid space (40), wherein in the fluid inlet section (B) a fluid calming device (66) is arranged, which calms the fluid entering from above into the fluid inlet section (B), before moving further in the direction of a bottom section (A) of the fluid chamber (FIG. 40) reached.

2. Vehicle transmission according to claim 1, characterized in that the fluid calming device (66) has a plurality of ribs (68, 70) which protrude into the cross section of the Fluideintrittsabschnitt.es (B).

3. Vehicle transmission according to claim 2, characterized in that the plurality of ribs (68, 70) have at least one first side rib (68) which projects from one side of the fluid inlet section (B) in the cross section of the fluid inlet section (B), and at least one second side rib (70) protruding from an opposite side of the fluid inlet portion (B) in the cross section of the fluid inlet portion (B).

4. Vehicle transmission according to claim 3, characterized in that the first

Side rib (68) and the second side rib (70) overlap, such that a is covered in an axial plan view of the first and / or the second side rib (68, 70) is covered over part of the cross section of the fluid inlet portion (B).

5. A vehicle transmission according to any one of claims 2-4, characterized in that at least one rib of the plurality of ribs (68, 70) extends obliquely upward from the side of the fluid inlet portion (B), so that the rib (68, 70) forms a fluid channel.

6. Vehicle transmission according to one of claims 1-5, characterized in that at least one rib (68 ') offset in the axial direction to at least one further rib (70') is arranged, such that in the Fluidberuhigungseinrichtung (66 ') entering fluid is deflected at least once in the axial direction.

7. Vehicle transmission according to one of claims 2-6, characterized in that at least one rib is associated with a gearbox housing section (12A) of the gearbox housing section (12), at least one further rib being associated with a coupling housing section (12B) of the gearbox housing (12).

8. Vehicle transmission according to one of claims 1-7 or according to the preamble of claim 1, characterized in that the fluid space (40) has a fluid inlet section (B), which has a fluid inlet section cross-section, wherein the fluid space (40) above of the fluid inlet portion (B) has a catching portion (C) having a catching cross section larger than the fluid inlet portion cross section.

9. Vehicle transmission according to claim 8, characterized in that the fluid space (40) has a bottom portion (A) having a bottom cross section which is larger than the fluid inlet portion cross section.

10. Vehicle transmission according to one of claims 1-9, characterized in that the fluid space (40) is bounded above by a sieve (80).

11. A vehicle transmission according to any one of claims 1-10, characterized in that the fluid space (40) can be filled to at least one of the following Bef Impossible: from above via spray fluid (76) and / or in a range below a minimum level (64) the fluid space (40) by means of fluid from a fluid supply device (62).

12. Vehicle transmission according to one of claims 1 - 1 1, characterized in that the fluid space (40) is formed by the transmission housing (12) and at least one in the transmission housing (12) inserted fluid space side wall (44).