Fluid supply system for a transmission system for a motor vehicle

Abstract

Fluid supply device (6) for a transmission device (1) for a motor vehicle, in particular for an electric drive axle of a motor vehicle, wherein the fluid supply device (6) has a pump device (11) designed for conveying fluid, in particular oil, through at least one fluid line (7) of the fluid supply device (6), wherein at least one outlet opening (13, 16), in particular a nozzle, associated with at least one area to be supplied, in particular a gear section, is connected to the fluid line (7) by a supply line (12, 18), wherein a valve device (14, 17) is designed to open the supply line (12, 18) in a first supply state at a first fluid pressure in the fluid line (7) and to at least partially close the supply line (12, 18) in a second supply state at a second fluid pressure in the fluid line (7) that is higher than the first fluid pressure.

Description

[0001] The invention relates to a fluid supply device for a transmission device for a motor vehicle, in particular for an electric drive axle of a motor vehicle, wherein the fluid supply device has a pump device designed to convey fluid, in particular oil, through at least one fluid line of the fluid supply device, wherein at least one outlet opening, in particular a nozzle, assigned to at least one area to be supplied, in particular a toothed section, is connected to the fluid line by a supply line.

[0002] Fluid supply devices for transmission systems of motor vehicles, which have a pump device through which fluid, for example oil, is guided in a targeted manner through a fluid line to at least one outlet opening, are generally known from the prior art. For example, the pump device can be specifically designed to guide the fluid to an area to be supplied, in particular a toothed section, of a gearwheel, in order to supply the meshing of two meshing gearwheels with the fluid, for example, to lubricate and cool it. Described transmission systems can assume different states during their operation, for example, depending on a rotational speed of the components of the transmission system, in particular of the described gearwheels.

[0003] For this purpose, it is also known from the prior art that at least one wheel, for example, the ring gear of a differential gear, is used to distribute fluid from a sump within the transmission, in particular to project it onto the points to be supplied. However, this form of distribution requires a sufficient rotational speed of the wheel, so that an additional supply is necessary when the motor vehicle is stationary or traveling at relatively low speeds. This is ensured, for example, by the pump device described above.

[0004] However, this means that the fluid pumped from the outlet opening described is also discharged by the pump device at higher speeds, so that due to the supply then also present by centrifuging the fluid, a double supply is ultimately provided to the area additionally supplied through the outlet opening, in particular to a gear section. Since the pump device is usually intended to supply a large number of points or devices, it is not possible to switch the pump device off at higher speeds. However, the double supply to the gear point reduces the efficiency of the transmission device, or such an operating state does not fully utilize the achievable efficiency.

[0005] The invention is based on the object of specifying a fluid supply device for a transmission device which is improved compared to the prior art and in which the efficiency is improved, in particular in operating conditions with a comparatively higher speed.

[0006] The object is achieved by a fluid supply device having the features of claim 1. Advantageous embodiments are the subject of the subclaims.

[0007] As described, the invention relates to a fluid supply device for a transmission device for a motor vehicle. The fluid supply device is generally designed to supply the transmission device or a section within the transmission device with fluid. The fluid used is, in particular, oil, or is understood within the scope of this description. Specifically, the fluid supply device can be provided for an electric drive axle of a motor vehicle or be designed to supply fluid thereto.

[0008] The fluid supply device has a pump device which is designed to convey fluid through at least one fluid line of the fluid supply device. The fluid line is connected via at least one supply line to at least one outlet opening through which the fluid can be guided to an area to be supplied, in particular a toothed section, in order to lubricate and / or cool it, for example. The fluid line can also be guided as desired through the transmission device, in particular in order to supply further supply points within the transmission device. The supply points can also be supplied through outlet openings from the fluid line, wherein outlet openings can also be provided which are formed directly on the fluid line, ie in particular without a valve device.

[0009] The invention is based on the finding that a valve device is provided which is designed to open the supply line in a first supply state at a first fluid pressure in the fluid line and to at least partially close the supply line in a second supply state at a second fluid pressure in the fluid line which is higher than the first fluid pressure. In the valve device, it can therefore be provided in an initial state at no and / or low pressure that the valve device, i.e. in particular the fluid line, is opened or “open”. Starting from the initial state, the valve device can at least partially change to the closed state when the pressure increases. When the pressure drops starting from the second fluid pressure, the fluid line can be opened further again accordingly.This makes it possible to implement targeted supply states through the fluid supply system, ensuring sufficient supply to the supply points, especially the gearing section, while preventing double supply or double lubrication to improve the efficiency of the transmission system. For example, while maintaining the same pump output, other consumers can be more heavily oiled without the pump system having to deliver more power.

[0010] To this end, the invention proposes implementing a first supply state in which the supply line is open, i.e. the fluid line is connected to the outlet opening, such that the fluid can pass from the fluid line through the supply line to the outlet opening and can leave the outlet opening to supply the area to be supplied, in particular the toothed section. In addition to a toothed section, an electrical machine, bearings or other components can also be provided as the area to be supplied. The first supply state is implemented in particular by the valve device when the fluid pressure assumes a first fluid pressure which is lower than the second fluid pressure. If the fluid pressure in the supply line increases, in particular above the described second fluid pressure, the valve device closes the supply line at least partially.In this case, it can be provided in particular that from a certain fluid pressure, e.g. from a third fluid pressure which is higher than the second fluid pressure, the valve device completely closes the supply line.

[0011] Accordingly, the implementation of the supply states can be coordinated with the mechanisms that ensure the distribution of fluid within the transmission device in the respective operating states of the transmission device. If, for example, there is a higher fluid pressure in the supply line at comparatively higher speeds or rotational speeds, the additional supply via the outlet opening can be shut off by closing the valve device in order to avoid placing additional strain on the pump device and instead to utilize the fact that the area to be supplied, in particular the gearing section, is already sufficiently supplied by oil being thrown off in this operating state. Therefore, the efficiency of the fluid supply device or of the transmission device comprising the fluid supply device is advantageously increased compared to a dual fluid supply.

[0012] In the fluid supply device, it can further be provided that the fluid supply device has at least one rotating component, in particular a wheel, in particular a ring gear of a differential gear, or is coupled to such a component, in particular a wheel, which is designed to convey fluid from a fluid sump into the region to which the at least one outlet opening is assigned, wherein in the second supply state, a quantity of fluid conveyed by the rotating component is sufficient to supply the region at least partially, in particular completely. As described above, targeted use is made of the fact that in the second supply state at least one component of the transmission device or the fluid supply device conveys fluid from the fluid sump into the region that is assigned to the outlet opening.Therefore, the amount of fluid delivered through the outlet opening into this area, especially onto the toothed section, can be reduced.

[0013] If the amount of fluid pumped by the rotating component is sufficient to supply the corresponding area, the valve device can be closed and the supply of fluid through the outlet opening can also be completely stopped. In addition to the fully open state and the fully closed state, at least one or more transitional states are possible in which the valve device is partially open, so that the amount of fluid made available to supply the area is provided partly by centrifugation and partly from the outlet opening. An oil sump, for example, a wet sump or a dry sump, can be understood or provided as a fluid sump. The supply of the area with fluid by centrifugation of a wheel immersed in the sump can also be referred to as "passive lubrication."

[0014] In a further development of the fluid supply device, the fluid supply device can be designed to execute the first state at a first driving speed of a motor vehicle having the fluid supply device and the second state at a second driving speed of the motor vehicle having the fluid supply device that is higher than the first driving speed. The fluid supply device can be coupled, for example, to a control unit of the motor vehicle or mechanically to the motor vehicle such that the fluid supply device can react to different driving speeds of the motor vehicle. For example, a direct mechanical coupling of the pump device of the fluid supply device to a drive device of the motor vehicle, for example an electric motor, can be provided.Furthermore, transmission elements, for example gears and the like, can establish the correlation between the driving speed and the fluid supply device, in particular the relationship between the driving speed and the amount of fluid thrown off, through the rotational speed of the transmission elements or at least one transmission element.

[0015] For example, at comparatively low driving speeds of the motor vehicle, a correspondingly comparatively low fluid pressure, for example the previously described first fluid pressure, can prevail in the fluid line. Since in such an operating state the supply through passive lubrication is usually not sufficient, the supply is ensured through the outlet opening. If the driving speed increases, the fluid pressure usually also increases, for example above the previously described second fluid pressure. Since at such comparatively higher driving speeds a supply through centrifugation of the fluid usually at least begins or is at least partially sufficient to supply the corresponding area, the amount of fluid made available through the outlet opening can be at least proportionally reduced.

[0016] In other words, at least two supply operating regions can be formed, for example, a first supply operating region in which the supply to the region associated with the outlet opening is ensured exclusively by fluid provided through the outlet opening. In addition, at least one second supply operating region can be formed, namely when the region associated with the outlet opening is supplied exclusively by centrifuged fluid.Between the described supply operating ranges, a transitional operating range can be provided in which the supply takes place proportionally, for example starting from the first supply operating range in a, in particular continuous, transition into the second supply operating range by, in particular continuous, closing of the valve device, for example via the rotational speed of at least one component of the transmission device, in particular the rotational speed of a drive shaft or a drive wheel of a drive device, or the driving speed.

[0017] The fluid supply device can be further developed such that the first supply state is implemented in a first speed range, in particular 0-30% of a maximum speed, of a shaft, in particular a drive shaft of an electric machine or an intermediate shaft, of a transmission device having the fluid supply device, and the second supply state is implemented in a second speed range that is higher than the first speed range, in particular 30-100% of a maximum speed. In this case, it can be taken into account, in particular, that the various components of the transmission device also have different fluid supply requirements at different speeds.

[0018] It can also be taken into account that the supply of centrifuged fluid increases at higher speeds. Accordingly, at higher speed ranges, for example above the second speed range or in the second speed range of the maximum speed, the supply of fluid through the outlet opening can be reduced or shut off. A complete shutdown can occur, for example, above 70% of the maximum speed, so that a transition range can be provided between the first supply state, which results from the valve device being fully open between 0 and 30%, and the second supply state, which results from the valve device being fully closed between 70% and 100% of the maximum speed, in which the valve device is partially open. The corresponding ranges or their limits can be determined, for example, by simulation or experiment.

[0019] The described valve device of the fluid supply device can, in principle, be designed as desired. In one embodiment, the valve device can be designed as a mechanical valve device or as an electromechanical or electromagnetic valve device. For example, the valve device can be designed as a mechanical valve device, which opens or closes mechanically depending on the fluid pressure in the supply line. The mechanical valve device can, in particular, have a valve body that is preloaded against a spring device. The spring device is compressed more or less in response to the pressure prevailing in the supply line, so that the valve body closes the opening in the valve more or less. Alternatively, electromechanical and / or electromagnetic valve devices can be provided.These are designed to specifically adjust the degree of opening or closing of the valve device depending on a control signal, for example, a voltage applied to the valve device or a current supplied to the valve device. Opening and closing can occur, for example, depending on a fluid pressure in the fluid line, specifically detected by a pressure sensor.

[0020] In particular, if the valve device is designed as a mechanical valve device, it can be provided that the valve device has at least one spring device, in particular a wave spring, which is designed to transmit an opening force to a valve body, in particular a ball or a plate or a cone, of the valve device against a compressive force acting on the valve body in the supply line. In other words, the compressive force due to the fluid pressure prevailing in the supply line acts on the valve body from one side, namely from the side of the valve body facing the pump device, wherein the compressive force tends to move the valve body into the closed position.In the opposite direction, i.e. on the side of the valve body facing the outlet opening, the opening force caused by the spring device acts on the valve body, which tends to move the valve body into the open position.

[0021] In other words, the described spring device creates an opening force and the described compressive force creates a closing force on the valve body. Accordingly, as the fluid pressure in the fluid line increases, the compressive force becomes increasingly greater than the opening force, so that the valve body is moved further towards the closed position while compressing the spring device. In the individual supply states, a force equilibrium therefore results, since the opening force increases when the spring device is compressed. The spring device and the valve body can be designed such that the opening state or the closing state and the transition state can be specifically adjusted so that the supply of the toothed section or generally of the area to be supplied associated with the outlet opening is ensured in all operating states of the fluid supply device or the transmission device.

[0022] In the fluid supply device, it can further be provided that the pump device has a pump drive device or that the pump device can be coupled or is coupled to a drive device of a transmission device having the fluid supply device. In the first described variant, the pump device can have an independent pump drive device, i.e., it can be driven or operated separately from the drive device of the transmission device, for example, an electric machine. Advantageously, the speed of the pump device can thus be adjusted in any operating state, independently of the operating state of the transmission device or the motor vehicle.

[0023] Alternatively, it can be provided that the pump device can be coupled or is coupled to a drive device of the transmission device. For example, the pump device can be mechanically coupled to a drive shaft of a drive device, in particular an electric machine, of the transmission device. In this case, the pump device depends on the current operating state of the drive device of the transmission device. Advantageously, no separate control of the pump device is required for this, but rather the operating state of the pump device results from the operating state of the transmission device. Therefore, the fluid pressure is also coupled to the operating states of the transmission device, so that the appropriate supply state can always be set by the fluid supply device due to the mechanical coupling of the pump device.

[0024] In a further embodiment of the fluid supply device, at least two supply lines, each with at least one outlet opening, can be connected to the fluid line, wherein the supply lines can be connected to the fluid line by means of different valve devices. This makes it possible for at least two areas to be supplied with different outlet openings, which are connected to the fluid line via different supply lines. In addition to an embodiment in which one supply line is connected to one outlet opening, at least one supply line can also be connected to at least two outlet openings.

[0025] The different valve devices provided for connecting the supply lines to the fluid line can be designed differently.

[0026] For example, at least one first valve device can be provided with at least one first spring device and / or at least one first valve body and / or a first opening diameter of the valve device. For the at least one further supply line, at least one second valve device can be provided with at least one second spring device and / or at least one second valve body and / or a second opening diameter of the valve device. The individual valve parameters of the different valve devices can be determined depending on the supply requirements of the areas associated with the outlet openings of the supply lines.For example, a first region associated with a first exhaust port can be formed by a toothed mesh between an intermediate shaft and a differential gear, and a second region associated with a second exhaust port can be formed by a toothed mesh between the intermediate shaft and a drive shaft. In principle, the toothed meshes or toothed sections, or generally the areas to be supplied, can be selected arbitrarily.

[0027] In addition to the fluid supply device, the invention relates to a transmission device, in particular an electric axle drive, comprising at least one previously described fluid supply device. In addition to the fluid supply device, the transmission device has, for example, at least one drive device, which can be designed as an electric machine. Furthermore, the transmission device can have a drive shaft driven by the drive device. Furthermore, the transmission device can have a differential, which can be connected to the drive shaft, for example, via an intermediate shaft.

[0028] Furthermore, the invention relates to a drive train having a previously described transmission device and / or a previously described fluid supply device. Furthermore, the invention relates to a motor vehicle having a previously described drive train and / or a previously described transmission device and / or at least one previously described fluid supply device.

[0029] In addition, the invention relates to a method for controlling the operation of a fluid supply device for a transmission device for a motor vehicle, in particular for an electric drive axle of a motor vehicle, wherein the fluid supply device has a pump device designed to convey fluid, in particular oil, through at least one fluid line of the fluid supply device, wherein at least one outlet opening, in particular a nozzle, assigned to at least one area to be supplied, in particular a toothed section, is connected to the fluid line by a supply line, wherein a valve device opens the supply line in a first supply state at a first fluid pressure in the fluid line and at least partially closes the supply line in a second supply state at a second fluid pressure in the fluid line that is higher than the first fluid pressure.The method can be carried out in particular by means of a previously described fluid supply device or with a transmission device which has such a fluid supply device.

[0030] All advantages, details and features described with regard to the fluid supply device are fully transferable to the transmission device, the drive train, the motor vehicle and the method.

[0031] The invention is explained below using exemplary embodiments with reference to the figures. The figures are schematic representations and show: Fig. 1 shows a schematic diagram of a transmission device with a fluid supply device for a motor vehicle; Fig. 2 a schematic diagram of a section of the fluid supply device of Fig. 1; and Fig. 3 a schematic diagram of a valve device for a fluid supply device of Fig. 1, Fig. 2.

[0032] Fig. 1 shows an embodiment of a transmission device 1 for a motor vehicle (not shown in detail). The transmission device 1 can be designed, for example, as an electric axle drive for a drive train of a motor vehicle. The transmission device 1 has, for example, a drive device 2, which can be designed as an electric machine. Connected to the drive device 2 is a drive shaft 3, which is coupled via an intermediate shaft 4 to a wheel 5, for example, a ring gear of a differential gear. Details of the design of the transmission device 1 can be changed within the scope of the present description, in particular with regard to the intermediate shaft 4, the drive shaft 3, or the wheel 5.

[0033] The transmission device 1 further comprises a fluid supply device 6, which provides a fluid line 7 through which fluid, in particular oil, can be conveyed to various supply points 8-10. The number of supply points 8-10 and their arrangement within the transmission device 1 can be selected as desired. To supply the individual supply points 8-10 with fluid, the fluid supply device 6 comprises a pump device 11, which can convey the fluid through the fluid line 7. The pump device 11 can be driven by a separate drive device or, as shown in dashed lines, can be mechanically coupled to the drive shaft 3 of the drive device 2.

[0034] In the exemplary embodiment shown, a first supply line 12 is arranged on the fluid line 7 and connects the fluid line 7 to a first outlet opening 13. A first valve device 14 is arranged in the first supply line 12 between the first outlet opening 13 and the fluid line 7. The first valve device 14 is designed to open the first supply line 12 depending on a fluid pressure within the fluid line 7, so that fluid from the fluid line 7 can reach the supply point 8 through the first outlet opening 13. For example, the first supply point 8 is formed in a toothed section between a wheel 15 arranged on the intermediate shaft 4 and the previously described wheel 5. As described, the supply points 8-10 can be selected as desired. Furthermore, a supply point 9 is shown as an example, which can be supplied directly from the fluid line 7, in particular without a valve.The supply point 9 can, for example, be assigned to the differential carrier.

[0035] A further supply point 10 can be supplied, for example, through an optional second outlet opening 16, which is designed to connect a second supply line 18 to the fluid line 7 via a second valve device 17. In other words, when the second valve device 17 is open, fluid from the fluid line 7 can pass through the second supply line 18 to the second outlet opening 16 and from there supply the supply point 10.

[0036] In addition to the fluid supply provided by the fluid supply device 6 via the pump device 11, fluid can be pumped from a sump by the wheel 15 - or alternatively, any other wheel or transmission element of the transmission device 1. For example, the pump device 11 also pumps the fluid from the sump into the fluid line 7. Purely by way of example, an arrow 19 shows that, in particular above a certain speed of the wheel 15, the wheel 15 absorbs oil from the sump (not shown in detail) and spins it off in the transmission device 1 or generally distributes it in the transmission device 1. Through this mechanism, which can also be referred to as "passive oiling", the fluid is also guided, for example, to the supply point 8, as shown by the arrow 19.

[0037] The fluid supply device 6 is particularly designed to reduce or completely terminate the fluid supply via the first outlet opening 13 in an operating state in which the fluid supply is ensured by the wheel 15 or the centrifugation of fluid. This reduces the power consumption of the pump device 11, so that the efficiency of the transmission device 1 is improved. In particular, this prevents double lubrication of the supply point 8. For example, with the pump output remaining constant, other consumers can be more intensively lubricate without the pump device 11 having to deliver more power. The description can be applied analogously to the valve device 17.

[0038] As described, the pump device 11 conveys the fluid from the sump into the fluid line 7, which is shown, for example, in a schematic perspective view in Fig. 2. If the valve device 14, 17 is open, the fluid flows through the supply line 12, 18 to the outlet opening 13, 16. If the valve device 14, 17 is closed, the outlet opening 13, 16 is separated from the fluid line 7. Intermediate or transitional states in which the valve device 14, 17 is partially open are also possible.

[0039] Fig.3 shows an exemplary schematic embodiment of the valve device 14, 17. The valve device 14, 17 can fundamentally be designed as a mechanical, electromagnetic, or electromechanical valve. In the embodiment shown, a spring device 20 is provided, which exerts an opening force on a valve body 22 according to arrow 21. In other words, the spring device 20 places the valve body 22 in an open position. A pressure force, shown as arrow 23, acts on the valve body 22, which can be designed, for example, as a sphere, cone, cuboid, or any other desired shape, in the fluid line 7 due to the fluid pressure prevailing there.

[0040] As can be seen, the pressure force according to arrow 23 counteracts the opening force according to arrow 21. Depending on the fluid pressure prevailing in the fluid line 7, the valve device 14, 17 is therefore closed more or less, so that the corresponding supply line 12, 18 and thus the outlet opening 13, 16 can be completely closed, partially closed, partially open, or completely open.

[0041] In particular, this can be coupled to an operating state of the transmission device 1, for example via a driving speed of a motor vehicle having the transmission device 1, via a rotational speed of at least one of the transmission elements, for example the drive shaft 3 or the intermediate shaft 4. For example, the pump device 11 can be controlled as a function of the operating state of the transmission device 1. If the pump device 11 is, for example, mechanically coupled to the drive shaft 3, the rotational speed of the pump device 11 and thus the pumped quantity of fluid into the delivery line 7 and thus the fluid pressure in the fluid line 7 result directly from the operating state of the transmission device 1. Alternatively, the pump device 11 can also be coupled to the intermediate shaft 4 or the shaft of the wheel 5.

[0042] This means that in a first supply operating range, for example at a first fluid pressure in the fluid line 7, the valve device 14, 17 is open and, for example at low engine speeds and / or low driving speeds, the supply point 8, 10 is supplied via the first outlet opening 13 or the second outlet opening 16. If the driving speed or the engine speed increases, the fluid pressure in the fluid line 7 also increases, so that the valve device 14, 17 closes at least partially and thereby reduces the supply of fluid through the outlet opening 13, 16. If the fluid pressure in the fluid line 7 is above a defined fluid pressure, the valve device 14, 17 can be completely closed, since in this case the fluid supply via the centrifugation of the fluid with the wheel 5 is sufficient.

[0043] Although the function of the first valve device 14 was previously described analogously to the second valve device 17, these valve devices can be designed or constructed differently. For example, the opening cross-sections, the spring rates, the spring characteristics, the dimensions of the valve bodies 22, and the like can be selected differently. This allows the amount of fluid from the outlet openings 13, 16 to be directly matched to the requirements of the supply points 8, 10 in different operating states, for example, so that the valve devices 14, 17 open or close in different operating ranges or remain open or closed for different lengths of time depending on the driving speed or the rotational speed of the transmission device 1.

[0044] The advantages, details, and features described with reference to the individual figures can be combined with one another as desired, are interchangeable, and are transferable to one another. The description is also transferable to the method, drivetrain, and motor vehicle described herein, which may have a transmission device 1 shown with all the advantages, details, and features. Reference symbol 1 Gearbox 2 drive device 3 drive shaft 4 Intermediate shaft 5 wheel 6 Fluid supply device 7 Fluid line 8-10 supply point 11 Pumping device 12 first supply line 13 first outlet opening 14 first valve device 15 wheels 16 second outlet opening 17 second valve device 18 second supply line 19 Arrow 20 Spring device 21 Arrow 22 valve body 23 Arrow

Claims

[1] Fluid supply device (6) for a transmission device (1) for a motor vehicle, in particular for an electric drive axle of a motor vehicle, wherein the fluid supply device (6) has a pump device (11) designed to convey fluid, in particular oil, through at least one fluid line (7) of the fluid supply device (6), wherein at least one outlet opening (13, 16), in particular a nozzle, assigned to at least one area to be supplied, in particular a toothed section, is connected to the fluid line (7) by a supply line (12, 18), characterized bya valve device (14, 17) which is designed to open the supply line (12, 18) in a first supply state at a first fluid pressure in the fluid line (7) and to at least partially close the supply line (12, 18) in a second supply state at a second fluid pressure in the fluid line (7) which is higher than the first fluid pressure. [2] Fluid supply device (6) according to claim 1, characterized by in that the fluid supply device (6) has at least one wheel (5), in particular a ring gear of a differential gear, or is coupled to such a wheel (5), which is designed to convey fluid from a fluid sump into the area to which the at least one outlet opening (13, 16) is assigned, wherein in the second supply state a quantity of fluid conveyed by the wheel (5) is sufficient to supply the area at least partially, in particular completely. [3] Fluid supply device (6) according to claim 1 or 2, characterized by in that the fluid supply device (6) is designed to execute the first supply state at a first driving speed of a motor vehicle having the fluid supply device (6) and the second supply state at a second driving speed of the motor vehicle having the fluid supply device (6) which is higher than the first driving speed. [4] Fluid supply device (6) according to one of the preceding claims, characterized byin that the fluid supply device (6) is designed to carry out the first supply state in a first speed range, in particular 0-30% of a maximum speed, of a shaft, in particular a drive shaft (3) of an electric machine or an intermediate shaft (4), of a transmission device (1) having the fluid supply device (6) and the second supply state in a second speed range which is higher than the first speed range, in particular 30-100% of a maximum speed. [5] Fluid supply device (6) according to one of the preceding claims, characterized by that the valve device (14, 17) is designed as a mechanical valve device (14, 17) or as an electromechanical or electromagnetic valve device (14, 17). [6] Fluid supply device (6) according to one of the preceding claims, characterized bythat the valve device (14, 17) has at least one spring device (20), in particular a wave spring, which is designed to transmit an opening force to a valve body (22), in particular a ball or a plate or a cone, of the valve device (14, 17) against a pressure force acting on the valve body (22) in the supply line (12, 18). [7] Fluid supply device (6) according to one of the preceding claims, characterized by that the pump device (11) of the fluid supply device (6) has a pump drive device or that the pump device (11) can be or is coupled to a drive device (2) of a transmission device (1) having the fluid supply device (6). [8] Fluid supply device (6) according to one of the preceding claims, characterized bythat at least two supply lines (12, 18), each having at least one outlet opening (13, 16), are connected to the fluid line (7), wherein the supply lines (12, 18) can be connected to the fluid line (7) by means of various valve devices (14, 17). [9] Transmission device (1), in particular electric axle drive, comprising at least one fluid supply device (6) according to one of the preceding claims. [10] Drive train comprising a transmission device (1) according to the preceding claim and / or at least one fluid supply device (6) according to one of claims 1 to 8. [11] Motor vehicle, comprising a drive train according to the preceding claim and / or a transmission device (1) according to claim 9 and / or at least one fluid supply device (6) according to one of claims 1 to 8. [12] Method for controlling the operation of a fluid supply device (6) for a transmission device (1) for a motor vehicle, in particular for an electric drive axle of a motor vehicle, wherein the fluid supply device (6) has a pump device (11) designed to convey fluid, in particular oil, through at least one fluid line (7) of the fluid supply device (6), wherein at least one outlet opening (13, 16), in particular a nozzle, assigned to at least one area to be supplied, in particular a toothed section, is connected to the fluid line (7) by a supply line (12, 18), characterized byin that a valve device (14, 17) opens the supply line (12, 18) in a first supply state at a first fluid pressure in the fluid line (7) and at least partially closes the supply line (12, 18) in a second supply state at a second fluid pressure in the fluid line (7) that is higher than the first fluid pressure.

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