DE102018221835A1 - Bandage for a motor vehicle transmission - Google Patents

Abstract

The invention relates to a bandage (28) for insertion into a transmission housing (26) of a motor vehicle transmission with two bearings (32) of two transmission shafts (14, 30), to each of which a spur gear (22, 23) of a gear stage is coupled, the Bandage (28) is designed to be arranged in sections around the bearings (32) in order to determine a maximum distance between the bearings (32) and thus the gear shafts (14, 30); a length of the bandage (28) is constant in response to the application of force; and an expansion coefficient of a material of the bandage (28) is less than an expansion coefficient of a material of the gear housing (26). The present invention further relates to an electric vehicle transmission (16) with such a bandage (28).

Description

The present invention relates to a bandage for a vehicle transmission and an electric vehicle transmission with such a bandage.

Helical gear units have advantages in the relatively simple construction, since few moving parts are used and the externally toothed spur gears are comparatively easy to manufacture. One disadvantage is the small translation, which can be done in one step. In addition, a spur gear is larger and therefore also heavier than, for example, a planetary gear with the same transmission power. In order to represent large translations with a pair of spur gears, the circumference of at least one gear is kept small, whereas the circumference of the second gear is kept large. The degree of coverage, that is to say the number of teeth in mesh, becomes smaller the smaller at least one of the meshed gears is. It must therefore be ensured that the individual teeth always come into engagement.

Gears that are used to transmit rotary movements and torques (power transmission) from an input shaft to an output shaft must be dimensionally stable with respect to radial forces that act on a gearwheel in particular when transmitting power. It is therefore known to represent larger translations with at least two gear pairs. However, such transmissions have relatively high transmission losses. Furthermore, such gears are less suitable for weight-relevant applications, such as racing, since the representation by means of at least two pairs of gearwheels is weight-intensive.

In general, it is desirable to make gearwheels light in order to keep the overall weight of the gearbox low. Weight reduction usually goes hand in hand with a loss of dimensional stability. Particularly in the case of light-weight gearboxes under high load, it is known that all parts involved in the power transmission deform elastically, as a result of which tooth meshing disorders can be caused. In particular when using electric drive machines that can reach very high speeds, for example in the range of 20,000 revolutions per minute, the gears are exposed to enormous loads.

When operating an electric vehicle, the temperature rises, which can range from several 10 ° C to 100 ° C, among other things due to the high mechanical load in the transmission. In lightweight gearboxes, it is known to combine different materials in order to save weight. The different materials in the gearbox can have different expansion coefficients, so that the distances between the individual gearbox components can change as the temperature rises or falls. If a center distance between two meshing gears increases, this can lead to tooth meshing problems. A relative change in the center distance per temperature stroke can result from a difference between the coefficient of expansion of the gear housing material (for example light metal) and the coefficient of expansion of the gear material (for example steel).

To counteract this, it is known to provide toothing by means of large teeth and so-called involute toothing, which can tolerate deviations in the center distance. However, gearboxes of this type have relatively high gearbox losses.

Against this background, the object of the present invention is to provide an approach for weight reduction or for minimizing transmission losses. In particular, a transmission or an electric vehicle transmission is to be created which, due to its properties in terms of low weight and high stability, is also suitable for use in electric motorsport at very high speeds and drive power.

To achieve this object, the invention relates in a first aspect to a bandage for insertion into a transmission housing of a motor vehicle transmission with two bearings of two transmission shafts, to which a spur gear of a gear stage is coupled, respectively
the bandage is designed to be arranged in sections around the bearings in order to determine a maximum distance between the bearings and thus the gear shafts;
a length of the bandage is constant in response to the application of force; and
an expansion coefficient of a material of the bandage is less than an expansion coefficient of a material of the gear housing.

• zwei Stirnrädern, die zusammen eine Gangstufe bilden;
• zwei Getriebewellen, an die jeweils ein Stirnrad angekoppelt ist;
• zwei Lagerungen zum Lagern der Getriebewellen; und
• einer Bandage nach einem der vorherigen Ansprüche.

In a further aspect, the invention relates to an electric vehicle transmission, with:

• two spur gears that together form a gear stage;
• two gear shafts, to each of which a spur gear is coupled;
• two bearings to support the gear shafts; and
• a bandage according to one of the preceding claims.

Preferred embodiments of the invention are described in the dependent claims. It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination indicated in each case, but also in other combinations or on their own without departing from the scope of the present invention.

A maximum distance between the gear shafts is determined by arranging the bandage around the bearings of the gear shafts. The bandage is placed around the two positions. The length of the bandage remains constant when force is applied. The bandage does not expand or only minimally under the influence of force, so it is rigid in the direction of a tensile force. This allows the maximum distance between the transmission shafts to be determined. A form of the bandage can be variable in an axial projection, in particular in response to a laterally acting force lying in an axial projection plane. An expansion coefficient of a material of the bandage is less than an expansion coefficient of a material of the gear housing. This can reliably ensure that the gears of a gear stage remain in engagement even when the temperature changes. In particular, even if temperature swings of up to over 100 ° C are run through. The gear shafts are usually mounted in the gear housing. If the gear housing is made of a different material than the spur gears on the gear shafts, it usually has a different coefficient of thermal expansion. If the gear housing expands more than the spur gears, there may be a tooth meshing problem. The length of the bandage can also change due to temperature changes. However, this changes the distance between the gear shafts to a lesser extent than if the gear shafts were mounted directly in the gear housing. The drum keeps the spur gears together even when the temperature changes. The reliability and stability of such a vehicle transmission are increased. It becomes possible to use very small teeth and to realize large translations. Losses are reduced. A highly efficient transmission can be created. Furthermore, the material of a gear housing can be chosen almost freely by such a bandage, so that the gear housing can be of weight-optimized design without having to take into account an expansion coefficient of the material for the gear housing. A light metal housing can also be used for very small teeth. The entire gearbox can thus be weight-optimized. The advantages mentioned above are particularly pronounced when using the bandage in an electric vehicle transmission.

In a preferred embodiment, a width of the bandage varies in sections along the bandage, the bandage preferably being designed to be arranged with a section of increased width around the bearings of the gear shafts. As a result, the bandage can be optimized in weight. Furthermore, the narrower sections simplify insertion into a gear housing, since lines, supply channels or the like can be passed more easily.

In a preferred embodiment, the bandage is designed to be arranged in sections around bearings that have a distance between the centers of the bearings in the range from 14.50 cm to 20.00 cm, preferably in the range from 17.00 cm to 18.50 cm , and particularly preferably in the range from 17.50 cm to 18.00 cm. In particular, the bandage has a corresponding length or dimensioning. By choosing a radial distance in the range of 14.5 cm to 20 cm, a high gear ratio can be achieved. Particularly with high gear ratios and large radial distances, the probability of tooth interference disorders is increased, so that the bandage can be used advantageously here. By choosing a radial distance in the range of 17.0 cm to 18 cm, a high gear ratio can be achieved, whereby the drum can be dimensioned smaller and thus optimized in weight. By choosing a radial distance in the range of 17.5 cm to 18.0 cm, a compromise can be found between gear ratio in one gear step and stability or weight of the drum.

In a preferred embodiment, the bandage is made of metal, in particular case-hardened steel. Additionally or alternatively, the bandage is made of CFRP fibers. Additionally or alternatively, the bandage is designed as an integral component. By forming the bandage from metal, in particular from case-hardened steel, it can be ensured in a simple manner that the expansion coefficient of the bandage is less than an expansion coefficient of a material of the transmission housing. Furthermore, the bandage can be made mechanically stable. The bandage can be optimized in weight by forming the bandage from CFRP. CFRP offers very good efficiency in terms of stability and weight. The formation of the bandage as an integral component can further simplify the manufacture of the bandage and enable it to be cost-effective.

In a preferred embodiment, the bandage is designed to be arranged in sections around bearings that have a ratio of the diameter of the bearings in the range of 1, 5 to 2.5, preferably in the range from 1.9 to 2.1, and particularly preferably from 2. In particular, the bandage has a corresponding length and width. By forming the bandage to be arranged around bearings with a ratio of the diameter of the bearings in the range of 1.5 to 2.5, the bandage can be used for shafts of gear ratios with a high ratio, which are used in particular in electric vehicle transmissions for racing. By forming the bandage to be arranged around bearings with a ratio in the range from 1.9 to 2.1, additional stability can be ensured with a high transmission ratio. With a high gear ratio, strong forces act on the shafts and especially the shaft bearings, so that sufficiently large and robust shaft bearings must be used. By designing the bandage to be arranged around bearings with a ratio of the diameter of the bearings of 2, a compromise between weight and stability can be found with a large transmission ratio, since sufficiently large and stable shaft bearings are used without dimensioning the shaft bearings too large.

In a preferred embodiment, an expansion coefficient of the material of the bandage is less than an expansion coefficient of light metal, preferably aluminum Al or magnesium magnesium, and / or of alloys which contain light metal, preferably aluminum Al or magnesium magnesium. This makes the bandage particularly suitable for lightweight gearboxes in which the above-mentioned materials are used.

In an advantageous embodiment of the electric vehicle transmission according to the invention, a gear ratio is greater than 5.5, in particular greater than 8.0, and particularly preferably equal to 8.9. Alternatively or in addition, the two spur gears have a module in the range from 1.0 mm to 1.8 mm, preferably in the range from 1.0 mm to 1.53 mm, and particularly preferably from 1.51 mm. By choosing a gear ratio greater than 5.5, a high gear ratio can be achieved with just one pair of gears. With a gear ratio of greater than 8.0, a torque or speed gear ratio can be represented in a wide range with only one gear arrangement. For example, a high transmission ratio of the torque of a high-torque electrical machine can be achieved. Furthermore, a high reduction in the speed of an electrical machine can take place. A high gear ratio is particularly advantageous for racing cars that are designed for top speed and lightweight construction. Racing cars are preferably equipped with light electrical machines that reach high speeds. A gear ratio of 8.9 represents a compromise between a quick start and an achievable maximum speed depending on the speed of the electrical machine. Furthermore, a gear ratio of 8.9 results in an advantageous ratio of weight and gear ratio. By choosing a module in the range from 1.0 mm to 1.8 mm, the rolling losses on the gear teeth and thus the transmission losses can be kept low. By choosing the module in the range from 1.0 mm to 1.53 mm, a preferred range can be found that allows sufficient power to be transmitted by means of the gear teeth without having to accept high gear losses. By choosing a module of 1.51 mm, a preferred compromise between manufacturability of the gearwheel, transmission of sufficient driving force / torque and reduction of the transmission losses can be found.

In a further advantageous embodiment, the electric vehicle transmission has a transmission housing made of light metal. The bandage is pressed into the gear housing. As an alternative or in addition, the bandage is cast into a casting of the gear housing. Alternatively or additionally, the bandage is extrusion-coated with lightweight materials, in particular plastic and / or fiber composite. By pressing the bandage into the gear housing, the manufacture of a gear housing including the bandage can be simplified. Furthermore, for example, the gear housing can be bought in or prepared in another workshop, which can simplify logistics. Pouring the bandage into a casting of the gear housing can simplify the manufacture of the gear housing, since there is no need for press-in or screwing tools. By overmoulding the bandage with lightweight materials, in particular plastic and / or fiber composite, the fit of the bandage in the transmission housing can be improved. Furthermore, the bandage or the gear housing can be sealed here in a technically simple and efficient manner. The bandage and the housing can be sealed using O-rings or a surface seal.

In a further advantageous embodiment, the electric vehicle transmission has a further bandage described above. The bandages are designed to accommodate bearings of the gear shafts on both axial sides of the spur gears. By providing a further bandage, the stability of the gear arrangement for the gear stage can be further improved. The first bandage is arranged on one axial side of the spur gears, the further bandage is arranged on the other axial side of the spur gears. Furthermore, it is conceivable to make the two bandages correspondingly smaller, so that the electric vehicle transmission can be optimized in weight.

The module m is the ratio between the pitch circle diameter of the gear and the number of teeth of the gear. The pitch circle diameter is the diameter of an invisible cylinder that runs through the center of the teeth. The pitch circle is defined as a circle, the center of which lies on the gear axis which runs through the pitch point of the gear teeth. This pitch point is located between the root of the gear tooth (root circle diameter) and the head of the gear tooth (tip circle diameter). The module is therefore a measure of the distance between two adjacent gear teeth. In the present case, the gear wheel diameter is to be understood in particular as the tip circle diameter. The coefficient of expansion is a measure of a change in the dimensions of a material or component in response to a change in temperature. The coefficient of expansion is substance-specific. With most materials, the dimensions increase with increasing temperature. A bandage is to be understood here as a closed or revolving band.

CFRP is to be understood as carbon fiber reinforced plastic or carbon fiber reinforced plastic (shortened carbon fiber, carbon or carbon). CFRP is a composite material in which carbon fibers are embedded in a plastic matrix. The matrix is used to connect the fibers and to fill the gaps. This creates a robust and light material that is used in particular in motorsport. Epoxy resin is usually chosen as the matrix. However, other thermosets or thermoplastics are also possible as the matrix material.

• 1 eine schematische Darstellung eines Elektrofahrzeugs mit einem Elektrofahrzeuggetriebe;
• 2 eine schematische Darstellung eines Antriebsstrangs für ein Elektrofahrzeug mit einer erfindungsgemäßen Bandage;
• 3 eine schematische Darstellung einer erfindungsgemäßen Bandage und eine Zahnradanordnung mit einem Zahnrad und einem Ritzel, die an Getriebewellen angeordnet sind;
• 4 einen schematischen Ausschnitt eines Antriebsstrangs mit einer erfindungsgemäßen Bandage;
• 5 eine perspektivische Ansicht einer Bandage gemäß der vorliegenden Anmeldung; und
• 6 eine weitere perspektivische Ansicht einer Bandage gemäß der vorliegenden Anmeldung.

The invention is described and explained in more detail below on the basis of a few selected exemplary embodiments in conjunction with the accompanying drawings. Show it:

• 1 a schematic representation of an electric vehicle with an electric vehicle transmission;
• 2nd a schematic representation of a drive train for an electric vehicle with a bandage according to the invention;
• 3rd a schematic representation of a bandage according to the invention and a gear arrangement with a gear and a pinion, which are arranged on gear shafts;
• 4th a schematic section of a drive train with a bandage according to the invention;
• 5 a perspective view of a bandage according to the present application; and
• 6 another perspective view of a bandage according to the present application.

In the 1 is a schematic of an electric vehicle 10th with drive wheels 12 , one with the drive wheels 12 operatively connected drive shaft 14 and a powertrain 15 shown. The representation corresponds to a section in a top view. The relevant components are enlarged and not shown to scale.

The drivetrain 15 has an electric vehicle transmission 16 with a pair of gears, an electrical machine 18th and a differential 20th on. The electrical machine 18th is operatively connected to a pinion 22 that meshes with an output gear 23 stands and forms the gear pair. pinion 22 and driven gear 23 are designed as spur gears. The pinion 22 can also be called a drive gear. The output gear 23 is at the gear foot 24th rotationally fixed with the differential 20th connected. Through the differential 20th can provide a driving force to the drive wheels 12 to get redirected. The pinion 22 , the driven gear 23 and the differential 20th are in a gearbox 26 added.

During an acceleration process in a drive mode, drive power from the electrical machine is in the drive train 18th provided and to the drive wheels 12 headed to the electric vehicle 10th to accelerate. So it becomes a power transmission path from the electrical machine 18th over the pinion 22 , the driven gear 23 and the differential 20th to the drive wheels 12 provided. The power transmission path can be the drive wheels 12 Driving power from the electrical machine 18th provide.

In a pushing operation, i.e. when the electric vehicle 10th at least part of the kinetic energy of the electric vehicle can be braked 10th via the power transmission path in the drive train 15 of the electrical machine 18th to provide. The electrical machine 18th is driven for recuperation via the power transmission path. The electrical machine 18th is used as a dynamo and converts the kinetic energy of the electric vehicle 10th into electrical energy. The converted energy can be stored in batteries, capacitors or other means for storing energy, not shown here, and if necessary, that is when the electric vehicle 10th to be accelerated again the electrical machine 18th are fed.

In a sailing business, that is when the electric vehicle 10th essentially no power is transmitted through the power transmission path, neither is to be accelerated nor decelerated.

In the 2nd is a schematic representation of the powertrain 15 for an electric vehicle 10th with a bandage according to the invention 28 shown. The drivetrain 15 corresponds essentially to that in 1 drive train shown. The output shaft 30th of the electrical machine 18th and the drive shaft 14 are collectively referred to as gear shafts. In the example shown, the drive train points 15 only one gear step by means of the pinion 22 and the driven gear 23 is formed. High forces act here, especially when the drive train 15 to be used for an electric motorsport vehicle. Furthermore, a high gear ratio can be achieved in one gear stage. Accordingly, the powertrain 15 , and particularly the various materials used in the drivetrain 15 are installed, go through a high temperature range during operation.

The electric vehicle transmission 16 Weight-optimized, especially if it was designed for use in motorsport. The gearbox 26 is made of a light metal, such as aluminum or magnesium. The heavily loaded spur gears, i.e. the pinion 22 and the driven gear 23 , are preferably made of case-hardened steel. Through the bandage 28 it can be ensured that an expansion of the gear housing 26 does not cause the two spur gears to move so far away from each other that the teeth of the toothing mesh poorly or not at all.

For this are in the bandage 28 Bearings 32 arranged to the gear shafts (output shaft 30th and drive shaft 14 ) and a maximum center distance between the output shaft 30th and the drive shaft 14 to determine. The bandage 28 has an expansion coefficient that is less than an expansion coefficient of a material of the transmission housing 26 . The bandage 28 does not grow with the gear housing when the temperature rises 26 With. The temperature-related expansion or shrinkage of the bandage and the gear housing are different. The sprocket teeth 22 or the output gear 23 stay engaged. The use of the bandage 28 is particularly advantageous if the pinion 22 and the driven gear 23 have small modules, for example in the range from 1.0 mm to 1.8 mm, preferably in the range from 1.0 mm to 1.53 mm and particularly preferably from 1.51 mm. The tooth height, i.e. the distance between a tooth base and a tooth head, is small compared to a gear wheel diameter of the driven gear wheel 23 .

In the 3rd is a bandage schematically 28 according to the present application and a gear arrangement with an output gear 23 and a pinion 22 shown with the pinion 22 on the output shaft 30th is arranged. The output gear 23 is on the drive shaft 14 arranged. The gear arrangement of the spur gears (pinion 22 and driven gear 23 ) has a high translation in the embodiment shown, in particular a translation in the above-mentioned areas. Furthermore, the gear arrangement, in particular in relation to the diameter of the driven gear 23 , a small module, in particular a module in the above range.

Through the bandage 28 can be prevented that the teeth of the toothing of the gear arrangement no longer interlock after an increase in temperature. In particular, the bandage can be selected by appropriate selection of the expansion coefficient of the material 28 blocking of the gear arrangement can also be prevented since the bandage 28 can expand when heated. Furthermore, it can also be guaranteed that when cooling, ie when the pinion 22 or the output gear 23 because of the coefficient of expansion, the teeth stay engaged as the bandage 28 can also contract.

In the 4th is a schematic section of a drive train 15 with a bandage 28 shown according to the present application. The bandage, the pinion 22 and the driven gear 23 are not drawn to scale. The bandage 28 is about storage 32 (Gear shaft bearings) arranged on which the output shaft 30th or the drive shaft 14 are stored. The output shaft 30th and the drive shaft 14 are called gear shafts. It is a transmission path from the electric machine 18th via the output shaft 30th to the rotationally fixed with the output shaft 30th connected pinion 22 continue to the output gear 23 , which rotates with the drive shaft 14 is connected.

The drive shaft 14 can drive power to a differential, not shown 20th or directly on the drive wheels, not shown 12 transfer. Furthermore, it is conceivable that the driven gear 23 rotatably on an outside of the differential 20th is arranged, the differential 20th Drive power via the drive shaft 14 on the drive wheels, not shown 12 transmits.

Transmission of drive power through the drive power transmission path described above acts on the transmission shafts 30th , 14 a force in this example in the direction of illustration upwards on the output shaft 30th and down on the drive shaft 14 works. The gear shafts 14 , 30th are in storage 32 added to counteract the force described above, so that the pinion 22 and the driven gear 23 stay engaged. By providing the bandage 28 resistance to this force described above can be improved. in particular, a retraction of the pinion 22 or the output gear 23 be counteracted due to this force.

5 shows a perspective view of a bandage 28 according to the present application. The bandage 28 has a first substantially rectilinear section 34 and a second substantially rectilinear section 36 on. The bandage also shows 28 a third section 38 in the form of a partial hollow cylinder and a fourth section 40 in the form of a partial hollow cylinder. The sections 34 , 36 , 38 , 40 are essentially arranged in the embodiment shown such that the center points of the sections are on one plane. It goes without saying that other geometries can also be provided. The ratio of the radii of the partial wood cylinders as well as the length of the bandage 28 , especially in relation to the width of the bandage 28 are chosen for better presentation and are not to be understood as restrictive.

In 6 is a perspective view of a bandage 28 shown according to the present application. The bandage 28 corresponds essentially to that in 5 shown bandage 28 . The first paragraph 34 and the second section 36 are narrower than the third section 38 and the fourth section 40 . The third and fourth section 38 , 40 have essentially the same width. It goes without saying that the widths of the sections can also be different in each case. In particular, the widths in relation to weight, expected maximum force on the bandage 28 and size of the shaft bearings 32 to get voted.

The invention has been described and explained comprehensively with reference to the drawings and the description. The description and explanation are to be understood as examples and not restrictive. The invention is not limited to the disclosed embodiments. Other embodiments or variations will occur to those skilled in the art using the present invention, as well as upon a detailed analysis of the drawings, the disclosure, and the following claims.

In the claims, the words "comprise" and "with" do not exclude the presence of further elements or steps. The undefined article "a" or "an" does not exclude the existence of a plurality. A single element or a single unit can perform the functions of several of the units mentioned in the claims. The mere mention of some measures in several different dependent claims is not to be understood to mean that a combination of these measures cannot also be used advantageously.

Reference symbol list

10th

Electric vehicle

12

drive wheel

14

drive shaft

15

Powertrain

16

Electric vehicle transmission

18th

electrical machine

20th

differential

22

pinion

23

Output gear

24th

Gear foot

26

Gear housing

28

bandage

30th

Output shaft

32

storage

34

first section

36

second part

38

third section

40

fourth section

Claims (10)

Bandage (28) for insertion into a transmission housing (26) of a motor vehicle transmission with two bearings (32) of two transmission shafts (14, 30), to each of which a spur gear (22, 23) of a gear stage is coupled, whereby the bandage (28) is designed to be arranged in sections around the bearings (32) in order to establish a maximum distance between the bearings (32) and thus the gear shafts (14, 30); a length of the bandage (28) is constant in response to the application of force; and an expansion coefficient of a material of the bandage (28) is less than an expansion coefficient of a material of the gear housing (26). Bandage (28) after Claim 1 , A width of the bandage (28) in sections along the Bandage varies, the bandage (28) preferably being designed to be arranged with a section (38, 40) of increased width around the bearings of the transmission shafts. Bandage (28) according to any one of the preceding claims, wherein the bandage (28) is designed to be arranged in sections around bearings (32) which a distance from the center of the bearings (32) in the range of 14.50 cm to 20, 00 cm, preferably in the range from 17.00 cm to 18.50 cm, and particularly preferably in the range from 17.50 cm to 18.00 cm. Bandage (28) according to one of the preceding claims, wherein the bandage (28) is formed from metal, in particular from case-hardened steel; is made of CFRP fibers; and or is designed as an integral component. Bandage (28) according to one of the preceding claims, wherein the bandage (28) is designed to be arranged in sections around bearings (32) which have a ratio of the diameter of the bearings (32) in the range from 1.5 to 2.5 , preferably in the range from 1.9 to 2.1, and particularly preferably from 2. Bandage (28) according to any one of the preceding claims, wherein an expansion coefficient of the material of the bandage (28) is less than an expansion coefficient of light metal, preferably aluminum Al or magnesium Mg, and / or of alloys containing light metal, preferably aluminum Al or magnesium Mg. Electric vehicle transmission (16), with: two spur gears (22, 23) which together form a gear stage; two gear shafts (14, 30), to each of which a spur gear (22, 23) is coupled; two bearings (32) for supporting the gear shafts (14, 30); and a bandage (28) according to one of the preceding claims. Electric vehicle transmission (16) after Claim 7 , wherein a gear ratio is greater than 5.5, preferably greater than 8.0, and particularly preferably equal to 8.9; and / or the two spur gears (22, 23) have a module in the range from 1.0 mm to 1.8 mm, preferably in the range from 1.0 mm to 1.53 mm, and particularly preferably from 1.51 mm. Electric vehicle transmission (16) according to one of the Claims 7 to 8th with a gear housing (26) made of light metal, the bandage (28) being pressed into the gear housing (26); is glued into the gear housing (26); is screwed to the gear housing (26); is cast into a casting of the gear housing (26); and / or is encapsulated with lightweight materials, in particular plastic and / or fiber composite. Electric vehicle transmission (16) according to one of the Claims 7 to 9 with another bandage (28) according to one of the Claims 1 to 6 The bandages (28) are designed to receive bearings (32) of the gear shafts (14, 30) on both axial sides of the spur gears (22, 23).

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