CN110291311B

CN110291311B - Vehicle transmission with isolated fluid spaces

Info

Publication number: CN110291311B
Application number: CN201880011273.2A
Authority: CN
Inventors: 尼科·格哈特; 克里斯蒂安·安茨特; 赖纳·卡斯坦
Original assignee: Magna Pt & CoKg GmbH
Current assignee: Magna Pt & CoKg GmbH
Priority date: 2017-02-09
Filing date: 2018-01-31
Publication date: 2023-06-27
Anticipated expiration: 2038-01-31
Also published as: DE102017102527A1; WO2018145963A1; CN110291311A; EP3580478A1

Abstract

The invention relates to a vehicle transmission (10) having a transmission housing (12), a plurality of shafts (20, 22, 24) which are rotatably mounted on the transmission housing (12), and a plurality of wheel sets (25) which are mounted on the shafts (20, 22, 24), wherein a fluid sump (30) is formed in a bottom region of the transmission housing (12), wherein a fluid space (40) is provided adjacent to the fluid sump (30), which is delimited by the fluid sump (30) and is designed to receive fluid from the fluid sump (30) and to calm the received fluid. The fluid space (40) is open upwards and has a fluid inlet section (B) via which fluid can enter the fluid space (40) from above, wherein a fluid-calming device (66) is arranged in the fluid inlet section (B) and calms the fluid entering the fluid inlet section (B) from above before the fluid continues to flow towards the bottom section (A) of the fluid space (40).

Description

Vehicle transmission with isolated fluid spaces

Technical Field

The invention relates to a vehicle transmission having a transmission housing, a plurality of shafts rotatably mounted thereon, and a plurality of wheel sets mounted on the shafts, wherein a fluid sump is formed in a bottom region of the transmission housing, wherein a fluid space is provided adjacent to the fluid sump, said fluid space being spaced apart from the fluid sump and being configured for receiving fluid exiting the fluid sump and for calming the fluid received.

Background

Such a vehicle transmission is known, for example, from DE 103 08 560b 4. In this known vehicle transmission, a container is provided laterally on the inside of the transmission housing next to the oil sump, which serves as an oil reservoir for the hydraulic device, wherein the transmission housing has a raised dividing wall provided next to the oil sump, behind which a housing opening is formed on the transmission housing, which is closed by a cover, and wherein the container is opened upwards and is filled with spray oil via an upper opening.

A lubrication oil circuit of an internal combustion engine is known from DE 100 62 5501, which has a refill container that is connected to the lubrication oil circuit via a refill line and a return line. An adjusting element is provided in the refill circuit, which adjusting element is controlled in dependence on the amount of oil in the lubricating oil circuit. The return line for returning the lubricating oil to the refill container and to the refill line cooperates with the adjusting element jointly such that the oil flow through the refill line is greater than the oil flow through the return line when required.

Document DE 100 51 356a1 discloses a transmission for a reciprocating piston internal combustion engine, having 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, which is operatively connected to the oil pump.

A transmission for a motor vehicle is known from DE 10 214 107 659a1, in which a fluid charging system has a pump and a fluid sump and at least one fluid reservoir. The fluid reservoir comprises a first fluid outflow opening into the fluid sump. The first fluid outflow opening may be controlled in relation to a state variable.

Document DE 10 215 107 815a1 discloses a further transmission for a motor vehicle, wherein the transmission has a fluid charging system. The fluid loading system includes at least one fluid sump. The transmission has a first clutch. The fluid loading system comprises at least one first fluid loading device which is designed to controllably load the first clutch with fluid from the fluid sump. The first fluid loading device has at least one first leak and at least one first pump. The first pump is operable in at least one pumping direction and at least one suction direction. The first leak contains at least one first fluid reservoir. The first fluid reservoir is designed to suppress the suction of air in the suction direction when the first pump is operating.

Disclosure of Invention

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 at the beginning by: the fluid space is open upwards and has a fluid entry section via which fluid can enter the fluid space from above, wherein a fluid calming device is provided in the fluid entry section, which calms the fluid entering the fluid entry section from above before continuing to flow towards the bottom section of the fluid space.

By means of measures for calming the fluid entering the fluid space in the upper fluid entry section before it reaches the bottom section of the fluid space, the entering fluid can be better calmed and if necessary degassed.

The fluid sedation device is preferably configured to slow the incoming fluid to cause: the fluid preferably enters the bottom section of the fluid space from the fluid calming device along the inner wall of the fluid space. In particular, by means of a fluid sedation device: the fluid does not substantially drip into the bottom section, but can flow into the bottom region, for example, at the side walls, so that the fluid located in the bottom region does not swirl or foam unnecessarily.

In the bottom section of the fluid space, the suction of the fluid is preferably carried out by means of a pump. By the measure that the bottom zone is particularly calm and the fluid contained therein is degassed, it can be ensured that: the fluid pumped by the pump is well suited for subsequent use in a hydraulic device, for example for operating a clutch or for operating a transmission component. Because foaming fluid can cause pressure irritation, this can be disadvantageous, inter alia, in connection with pressure control, i.e. pressure control which is preferably applied when operating a clutch of a motor vehicle transmission.

The bottom section of the fluid space is preferably sealed against the fluid sump and preferably defines a minimum fluid level or minimum liquid level of fluid within the fluid space. The minimum liquid level is preferably arranged below the fluid entry section.

It is also generally possible that the fluid space is sealed from the fluid sump up to the fluid entry section.

As a whole, it is possible to fill the separate fluid spaces, which are preferably high and have a narrow upper part. The fluid contained in the fluid space can be sedated and degassed by structural measures, in particular a sedative device.

The minimum liquid level in the fluid space is preferably above a level at which suction of the fluid by the pump takes place.

It is common to be able to introduce more fluid into the overall system through the fluid space if necessary without increasing the fluid level in the fluid sump and causing splash losses.

More precisely, this can be achieved by a fluid space, if appropriate: the fluid pan is at a lower level than the wheel set during operation so that no splash losses occur.

The terms "upper" and "lower" are currently understood to mean that gravity is oriented from top to bottom. The term "open upwards" thus means: the fluid arranged in the area of the opening of the fluid space drops downwards due to gravity.

Sedative fluid the term is based on: reducing the velocity of the fluid in the region and/or reducing the chaotic movement of the fluid within the region, more precisely, in particular with respect to the fluid state above the fluid entry section.

The fluid-calming device is preferably designed such that the fluid entering toward the fluid space is deflected at least once, preferably at least twice and particularly preferably at least three times, in a labyrinth manner before it reaches the bottom section of the fluid space. Particularly preferred is a helical or convoluted guidance of the fluid in the fluid-calming device, wherein the fluid is deflected at least once, preferably at least twice and particularly preferably at least three times, before entering the bottom section of the fluid space.

The diversion of the fluid can take place substantially in a radial plane. In a further embodiment, the diversion of the fluid takes place in the axial direction, that is to say in the following manner: such that fluid flows once in the axial direction and once in the opposite axial direction. It is particularly preferred that the combination of radial and axial steering is such that a type of convoluted guiding of the fluid is performed.

Overall, it is preferably possible by means of the fluid-calming device to keep the "foam" of the fluid in the bottom section of the fluid space to a minimum. Preferably, the surface of the fluid in the bottom section is as calm as possible and not so foaming.

It is furthermore generally preferred that the leakage feedback device is arranged such that it does not induce turbulence in the sedated region, i.e. preferably outside the "foam".

The hydraulic device for lubricating the wheel set and/or the bearings of the wheel set can be designed in particular as an injection lubrication device, in which the fluid is pumped by means of a pump and is then directed specifically via a channel toward the bearing and/or the junction point of the wheel set.

Said aim is particularly perfectly achieved.

According to a particularly preferred embodiment, the fluid-calming device has a plurality of ribs which protrude into the cross section of the fluid entry section.

The cross section of the fluid entry section corresponds to a cross section through the fluid entry section in a direction transverse to the direction of gravity. Preferably, the cross section is arranged along a horizontal direction. By means of the rib, it is possible to realize: the fluid entering the fluid space becomes sedated before it reaches the bottom region of the fluid space.

In this case, it is preferred if the plurality of ribs has at least one first side rib which projects from one side of the fluid entry section into the cross section of the fluid entry section and at least one second side rib which projects from the opposite side of the fluid entry section into the cross section of the fluid entry section.

In this way it is possible to realize: the sedation of the fluid can be achieved as independently as possible of the entry angle at which the fluid reaches the fluid entry section from above.

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

This is achieved in such a way: the fluid cannot reach directly from above the fluid entry section into the bottom section of the fluid space, i.e. not on a direct "fluid channel". More precisely, by means of the fluid-calming device thus configured, it is possible to achieve: the fluid is caught at the side ribs and then flows downward or out of the side ribs in a targeted manner into the bottom region. The downward flow in the bottom region can take place at a lower speed by the fluid than in the case where the fluid can reach the region of the bottom section directly from above the inflow entry section.

According to another preferred embodiment, at least one of the plurality of ribs extends obliquely upwards from one side of the fluid entry section, such that the rib forms a fluid launder.

By this measure, a collection of fluid is already carried out in the region of the fluid sedation device, which fluid is thus already able to degas in the region of the fluid sedation device. The evolved bubbles and/or foam can escape upward through inherent buoyancy. Preferably, the fluid that has been partially or completely degassed then flows away from the ribs, in which the fluid flows over the edges of the launder and then along the side walls of the fluid space into the bottom section.

It is furthermore advantageous if at least one rib is arranged offset in the axial direction from at least one further rib, so that the fluid entering the fluid-calming device is deflected at least once in the axial direction.

The ribs can be inclined in this case relative to the horizontal and longitudinal axes in order to be able to achieve a targeted axial deflection.

In this case, it is particularly preferred if the fluid-retaining device is designed such that the fluid is deflected at least once in the axial direction and at least once in the radial direction, i.e. in the radial plane, such that a type of cyclotron labyrinth guidance is achieved.

It is furthermore advantageous if at least one rib is associated with a transmission housing section of the transmission housing, wherein at least one further rib is associated with a clutch housing section of the transmission housing.

In particular, if the ribs are arranged offset in the axial direction, a fluid-retaining device can be realized in an advantageous manner in terms of construction, since the fluid-retaining device then consists of sections which are produced independently of one another, i.e. for example of a transmission housing section and a clutch housing section of the transmission housing, wherein the transmission housing section and the clutch housing section are screwed to one another via a sealing flange.

According to a further preferred embodiment, the fluid space has a fluid entry section having a fluid entry section cross section, wherein the fluid space has a capturing section above the fluid entry section having a capturing cross section which is larger than the fluid entry section cross section.

In this way it is possible to realize: a relatively large opening for accommodating fluid exiting from the transmission housing area associated with the fluid sump can be achieved.

In other words, a relatively large amount of injection fluid can be received from the fluid sump region, which is captured on a relatively large capture section and subsequently enters a fluid entry section of narrower or smaller cross-section.

In this embodiment, the fluid sedation device can also be implemented without ribs. Preferably, the ribs can be omitted when a rapid filling of the fluid space is required. In the case of the elimination of ribs, it is preferable to ensure by means of the fluid-calming device that: the oil, together with the "foam" that it may have if present, already causes sedation itself, preferably by a correspondingly selected vertical height of the fluid space.

In this case, it is preferred if the fluid space has a bottom section with a bottom cross section that is larger than the fluid inlet section cross section.

In this way it is possible to realize: the provision of a relatively large volume for the fluid in the region of the bottom section, while the entry into the fluid space can only be achieved via a relatively small cross section, which is defined by the fluid entry section.

Preferably, the bottom cross section is larger than the capture cross section. However, the capture cross-section can also be greater than the bottom cross-section in some embodiments.

It is furthermore advantageous if the fluid space is delimited upwards by a screen.

In this case it is possible to realize: only "clean", i.e. fluid filtered by the screen reaches the fluid space.

This can further increase the functionality of the pump which pumps fluid from the bottom section of the fluid space.

Generally, the fluid space may be filled by at least one of the following filling possibilities: the area from above that is filled via the injection fluid and/or below the minimum filling level of the fluid space is filled with fluid from the fluid supply.

Filling from above via the injection fluid can be assisted, for example, by: in the upper region of the transmission housing, a so-called fluid divider (fluidihose) or fluid "catcher" is provided, by means of which fluid which is sprayed upwards during operation can be guided in a targeted manner into the fluid space or into the region of a catching section of the fluid space.

A further possibility of filling is preferably carried out in the region below the minimum filling level of the fluid space, more precisely by means of the fluid coming out of the fluid supply.

The fluid coming out of the fluid supply device can in particular be a fluid which is conducted back from the actuator and/or from the lubrication device of the hydraulic device, but can also be a leakage fluid which is conducted back from, for example, a pump, a baffle or the like.

In general, the fluid space can be formed in different ways, for example by means of an inherent container which is inserted into the transmission housing and can be produced, for example, from plastic or metal. However, it is also generally conceivable for the fluid space to be formed by a section of the transmission housing and a component which is connected to the transmission housing from the outside. In this case, it is preferable if the fluid space thus formed outside the transmission housing is connected via a corresponding interface to the housing interior or to another component of the vehicle transmission.

It is particularly preferred that the fluid space is formed by the transmission housing and at least one fluid space side wall inserted into the transmission housing.

Thereby, the fluid space can be formed in a simple manner. In some cases, the fluid space side wall can also be formed by a part of the transmission housing, that is to say is formed in one piece with the transmission housing.

The fluid space side wall, like for example a container provided internally or externally on the transmission housing, can also be manufactured from plastic or from a metallic material.

The method can realize the following steps: if necessary, more fluid is introduced into the system, while the fluid level in the wheel set region does not increase during operation, since the fluid space can accommodate an additional fluid volume. An increased robustness with respect to the foaming level of the high gas fraction (air fraction) or of the transmission fluid is preferably produced. In this way, an improvement in adjustability and, if appropriate, in all driving states can be achieved if the fluid sucked out of the fluid space is used, for example, for an actuator of a clutch or a transmission component. Furthermore, if necessary, a reduction in oil aging can occur, more precisely by a smaller air content in the tribological system. Furthermore, an improvement in the service life of the pressure sensor in the same hydraulic circuit can be achieved if necessary, since the pressure sensor may be subjected to pressure peaks due to air bubbles (air bubbles).

The vehicle transmission can in particular be an automated vehicle transmission, but can also be a transmission with manual shifting. In an automated transmission, the vehicle transmission can be an automated gear change transmission with a single separating clutch between the internal combustion engine and the actual transmission. However, the drive motor can also comprise an electric drive unit, either as a pure electric vehicle or as a hybrid vehicle. Further, the vehicle transmission can be a dual clutch transmission. Preferably, the hydraulic device has a pump which pumps fluid from a bottom section of the fluid space. The hydraulic device preferably comprises an actuator for actuating a transmission component, for example a shifting clutch, and/or an actuator for actuating at least one clutch, which is arranged as a starting clutch and a separating clutch in front of the vehicle transmission and is preferably accommodated in a section of the transmission housing.

It is to be understood that the features mentioned before and still to be elucidated below can be used not only in the respectively given combination, but also in other combinations or alone, without departing from the scope of the invention.

Drawings

Embodiments of the present invention are illustrated in the accompanying drawings and described in detail in the following description. The drawings show:

a schematic cross-sectional view of a vehicle transmission according to one embodiment of the invention is shown in figure 1,

fig. 2 shows a schematic cross-sectional view of a vehicle transmission according to another embodiment of the invention.

Detailed Description

In fig. 1, a motor vehicle transmission 10 is shown by way of example in schematic form, which can be an automated gear-change transmission or a dual clutch transmission.

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

The input shaft arrangement 20 is rotatably mounted in the transmission housing 12, which can be, for example, a single input shaft, but can also be formed by two shafts (inner shaft and hollow shaft) 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 one another via a wheel set, as is known per se, wherein the wheel set can preferably be shifted into the power flow by means of a shifting clutch in order to shift gears of the vehicle transmission 10 in this way. The vehicle transmission 10 preferably has five or more forward gears and at least one reverse gear. Preferably, the vehicle transmission 10 has exactly 6, 7, 8 or 9 forward gears.

The

output shafts

22, 24 are coupled with a differential 26 that is housed in the transmission housing 12. The differential 26 is in turn coupled to the driven shaft 28, i.e. for distributing the absorbed power to the driven shaft 28, as is known per se in the prior art.

A fluid 29 is contained in the transmission housing 12 and a fluid sump 30 is formed in the bottom region of the transmission housing 12. Fig. 1 shows a bottom shell level 32, which can be arranged above the lowermost section of the wheel set in the stationary state of the vehicle transmission 10. In operation, the bottom shell level 32 is preferably disposed below the lowermost section of the wheel set. Differential 26 is preferably sealed with respect to fluid sump 30. There can be a self fluid sump in the differential 26, however, it can also be that a self fluid is contained therein, which fluid is not in contact with the fluid 29 exiting the fluid sump.

A fluid space 40 is also formed in the transmission housing 12. The fluid space 40 is delimited with respect to the fluid sump 30 and serves to contain fluid exiting from the fluid sump in order, on the one hand, to reduce the sump liquid 32 during operation. On the other hand, fluid space 40 is used to calm the fluid so that fluid can be pumped from fluid space 40 by hydraulic means.

The fluid space 40 is currently delimited by a bottom section 41, which is formed by the transmission housing 12. Furthermore, the fluid space 40 is delimited by a first side wall section 42, which is likewise formed by the transmission housing 12. The second side wall section 44, which is arranged at a distance from the outer wall of the transmission housing 12, can be formed as part of the transmission housing 12, i.e. for example cast integrally therewith. However, the second side wall section 44 can also be formed by a separate component which is inserted into the transmission housing 12.

Furthermore, fig. 1 schematically shows a rear wall section 46, which can be formed, for example, by a wall of the transmission housing extending transversely to the

shafts

20, 22, 24. The other wall section can be formed, for example, by a transmission cover or the like, which is not shown in fig. 1.

The second side wall section 44 extends from the bottom section 41 initially upwards over a first relatively short vertical section 48. The first vertical section 48 then transitions into a first horizontal section 50, which is oriented toward the first side wall section 42. The first horizontal section 50 transitions into a second vertical section 52 which runs parallel to the first side wall section 42 or is oriented in a tapering manner in this respect. The second vertical section 52 is also connected to a second horizontal section 54 that extends from the second vertical section 52 away from the first sidewall section 42.

The second horizontal section 54 forms an upper side of the fluid space 40 to define a maximum liquid level 56 of the fluid space 40.

The fluid space 40 is divided in the vertical direction by the

side wall sections

42, 44 into a bottom section a, a fluid inlet section B and a capturing section C. The capturing section C leaves from the upper side of the fluid space 40 and is substantially defined with respect to its cross section by the second horizontal section 54. From the capturing section C, the cross-section of the fluid space 40 tapers towards a fluid entry section B, which is smaller than the cross-section of the capturing section C.

From the fluid entry 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 entry section B.

Also shown in fig. 1, a first pump suction point 58 and a second pump suction point 60 are provided inside the bottom section a of the fluid space 40. Furthermore, a leakage feedback device 62 is provided inside the bottom section a, via which, for example, a baffle device from the hydraulic device or a leakage flow from the pump can be returned directly into the fluid space 40. Since the fluid contained in the hydraulic device, which is generated as leakage fluid, is not doped with gas, the leakage fluid can be directly introduced into the bottom section a of the fluid space 40 without causing a collection of gas or the like there. Furthermore, the leakage quantity is relatively small, so that no turbulence or other disturbance of the fluid is induced in the interior of the bottom section a.

Preferably, the pump suction points 58, 60 and the leakage feedback device 62 are located below a minimum level 64 of the fluid space 40. The minimum liquid level 64 is defined by the fill level of the fluid space 40, which is not lower in any normal operating mode of the vehicle transmission. Above the minimum level 64, for example, an overflow 65 can be provided in the second side wall section 44, via which fluid rising above the minimum level 64 can be conducted back into the fluid sump 30. However, the overflow opening 65 can also be omitted and the overflow can be formed only by the upper edge of the second side wall section 44, in particular by the upper edge of the catching section C.

In the fluid entry section B, a fluid-retaining device 66 is provided, which is currently embodied as a rib-retaining device.

Fluid sedation device 66 has a plurality of first ribs 68 disposed one above the other, which extend from second sidewall section 44 into fluid entry section B, more precisely, into section B at an angle α, which may lie, for example, in the range of 5 ° +.alpha.ltoreq.70 °. Furthermore, fluid sedation device 66 includes a plurality of second ribs 70, which are also disposed vertically offset above one another, as are ribs 68. The second rib 70 likewise extends obliquely upward at an angle β, which can be the same as the angle α or can lie in a similar range.

The second rib 70 extends from the first sidewall section 42 into the fluid entry section B, more precisely towards the first sidewall section 42.

First rib 68 and second rib 70 overlap one another in overlap region 72 such that a substantial portion, or preferably the entire portion, of the cross section of fluid entry section B is covered by first rib 68 and/or second rib 70 in an axial top view.

In fig. 1, it can be seen that the oil 76 is sprayed upwards during operation of the motor vehicle due to the direction of rotation of the

shafts

20, 22. The injected oil reaches the area above the capturing section C. If necessary, this can be aided by a fluid slicer 78, which is schematically illustrated in fig. 1.

The capturing section C can be bounded up by a fluid screen 80 such that fluid entering the capturing section C is first screened and thereby cleaned before entering the capturing section C.

In an alternative embodiment of the vehicle transmission shown in fig. 1,

ribs

68, 70 can also be omitted. In this variant, it is particularly preferred that the catching section C has a larger cross section in a vertical plan view than the intermediate fluid-calming section B. It is furthermore preferred that the bottom section a of the fluid space 40 has a larger cross section in a vertical plan view than the fluid entry section B, so that the capturing section C has a larger cross section above the fluid entry section B and the bottom section a in turn has a larger cross section than the fluid entry section B.

Fig. 2 shows an alternative embodiment of a vehicle transmission, which generally corresponds to the embodiment shown in fig. 1 with regard to terms of construction and function. Accordingly, like elements are denoted by like reference numerals. The differences are substantially elucidated hereinafter.

In the vehicle transmission 10' shown in fig. 2, it is initially determined that the transmission housing 12 is composed of a transmission housing section 12A and a clutch housing section 12B, wherein these

housing sections

12A, 12B are connected to one another via circumferential flanges. The clutch housing section 12B and the transmission housing section 12A follow one another in the axial direction such that the flange sections are oriented substantially radially.

Furthermore, fluid entry section B contains a fluid sedation device 66 'in the form of a sedation rib device having at least one rib 68' that is disposed offset in the axial direction from at least one other rib 70 'such that fluid entering fluid sedation device 66' is diverted at least once in the axial direction.

The ribs 68 'and 70' are preferably associated with different housing sections, i.e., the rib 68 'is associated with the clutch housing section 12B, for example, while the other rib 70' is associated with the transmission housing section 12A.

As shown in fig. 2, the fluid introduced into the fluid-calming section B meanders here in a cyclotron fashion to the base section a, to be precise preferably on a curved surface, so that good degassing of the fluid flowing out via the ribs is achieved.

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

Also shown in fig. 2, the rib 70' extends to the upper end of the fluid entry section B such that the rib 70' defines a maximum level 56' up to which fluid can be introduced into the fluid space 40. The fluid then begins to overflow into the fluid sump 30 via the upper edge of the rib 70', as is shown by the further arrow in fig. 2. Accordingly, the upper edge of the rib 70 'is indicated at 65' in FIG. 2, as the rib then forms a type of overflow.

Preferably, at least one rib is formed by the transmission housing section 12A, while at least one other rib is formed by the clutch housing section 12B. The individual housing sections can thereby be produced more simply in terms of construction, more precisely, for example, by means of a simpler casting mold.

Claims

1. A vehicle transmission (10) having a transmission housing (12), a plurality of shafts (20, 22, 24) which are rotatably mounted on the transmission housing (12), and a plurality of wheel sets (25) which are mounted on the shafts (20, 22, 24), wherein a fluid sump (30) is formed in a bottom region of the transmission housing (12), wherein a fluid space (40) is provided adjacent to the fluid sump (30), which is delimited by the fluid sump (30) and which is designed to receive fluid from the fluid sump (30) and to calm the received fluid,

it is characterized in that the method comprises the steps of,

the fluid space (40) is open upwards and has a fluid entry section (B) via which fluid can enter the fluid space (40) from above, wherein a fluid calming device (66) is provided in the fluid entry section (B), which calms the fluid entering the fluid entry section (B) from above before the fluid continues to flow towards the bottom section (a) of the fluid space (40), wherein the fluid calming device (66) has a plurality of ribs (68, 70) which extend into the cross section of the fluid entry section (B), wherein at least one rib of the plurality of ribs (68, 70) extends obliquely upwards from one side of the fluid entry section (B) such that the ribs (68, 70) form a fluid flow channel, wherein at least one first side rib (68) is arranged offset in the axial direction from at least one second side rib (70) such that the fluid entering the fluid calming device (66) always turns in the axial direction at least once in relation to the fluid entry section.

2. The vehicle transmission of claim 1, wherein the plurality of ribs (68, 70) have at least one first side rib (68) extending into the cross-section of the fluid entry section (B) from one side of the fluid entry section (B) and at least one second side rib (70) extending into the cross-section of the fluid entry section (B) from an opposite side of the fluid entry section (B).

3. The vehicle transmission according to claim 2, characterized in that the first side rib (68) and the second side rib (70) overlap one above the other such that a substantial part of the cross section of the fluid entry section (B) is covered in an axial plan view by the first side rib and/or the second side rib (68, 70).

4. The vehicle transmission of claim 1, wherein at least one first side rib is associated with a transmission housing section (12A) of the transmission housing (12), and wherein at least one second side rib is associated with a clutch housing section (12B) of the transmission housing (12).

5. The vehicle transmission according to claim 1, characterized in that the fluid space (40) has a fluid entry section (B) with a fluid entry section cross section, wherein the fluid space (40) has a capturing section (C) above the fluid entry section (B) with a capturing cross section that is larger than the fluid entry section cross section.

6. The vehicle transmission according to claim 5, characterized in that the fluid space (40) has a bottom section (a) with a larger bottom cross section than the fluid entry section cross section.

7. The vehicle transmission of claim 1, wherein the fluid space (40) is bounded upwardly by a screen (80).

8. The vehicle transmission according to claim 1, characterized in that the fluid space (40) is fillable by at least one of the following filling possibilities: the area from above that is filled by means of the injection fluid (76) and/or that is below the minimum filling level (64) of the fluid space (40) is filled by means of the fluid exiting from the fluid supply (62).

9. The vehicle transmission of claim 1, wherein the fluid space (40) is formed by the transmission housing (12) and at least one fluid space sidewall (44) inserted into the transmission housing (12).