System with a lubricating oil circuit and a cooling oil circuit

Abstract

The invention relates to an oil reservoir (10) for a system (100) having a lubricating oil circuit (S) and a cooling oil circuit (K), to a system (100) equipped with such an oil reservoir, such as a vehicle driveline having a lubricating oil circuit (S) and a cooling oil circuit (K), and to a method for operating said system. The system (100) can thus be configured more simply, more space-savingly, more inexpensively and / or more weight-savingly, or correspondingly in such a way that the system (100) comprises an oil reservoir (10) which is designed to distribute oil (1) into the lubricating oil circuit (S) and the cooling oil circuit (K).

Description

Field of the Invention

[0001] The present invention relates to an oil reservoir for a system having a lubricating oil circuit and a cooling oil circuit, in particular for a vehicle powertrain having a transmission and / or bearings lubricated with oil from the lubricating oil circuit and an electric motor cooled with oil from the cooling oil circuit. The present invention also relates to a system having a lubricating oil circuit and a cooling oil circuit, in particular a vehicle powertrain having a transmission and / or bearings lubricated with oil from the lubricating oil circuit and an electric motor cooled with oil from the cooling oil circuit. The present invention also relates to a method for operating such a system. Background Art

[0002] Single-speed and multi-speed transmissions are usually lubricated by splash lubrication. The rotating components of such a transmission are immersed in oil and distribute it within the transmission housing. By using oil guiding components and oil collectors, the oil can be specifically fed to different lubrication points.

[0003] For cooling, the rotor and / or stator of an electric motor can also be equipped with a cooling oil circuit.

[0004] An electric motor having a rotor and a stator cooled by a cooling oil circuit is known from DE 10 2014 110 778 A1. In this case, the cooling oil circuit includes an oil reservoir and an oil pump. The oil reservoir has a bottom and at least one side wall. At the bottom of the oil reservoir, a plurality of oil outlets are embedded simultaneously. Through at least one of the oil outlets, the cooling oil can flow to the stator. Furthermore, an overflow element is formed that is raised relative to the bottom and defines an opening that is aligned with one of the oil outlets and through which the cooling oil can flow to the rotor. The cooling oil is pumped into the oil reservoir by the oil pump.

[0005] An electric motor having a rotor and a stator oil-cooled by a cooling oil circuit is also known from DE 10 2013 226 851 A1. In this case, the rotor has a hollow corrugated rotor shaft and rotor shaft bearings. A part of the oil branched off from the cooling oil circuit is used for the cooling and lubrication of the rotor shaft bearings. The cooling oil of the cooling oil circuit is pumped through the hollow shaft-shaped rotor shaft and along the rotor shaft bearings. In order to protect the bearing rolling elements from excessive oil immersion, an overflow can be provided in the bearing area.

[0006] However, systems known in the prior art having a lubricating oil circuit and a cooling oil circuit have not been optimally designed. Thus, in systems known in the prior art having a lubricating oil circuit and a cooling oil circuit, the lubricating oil circuit and the cooling oil circuit are configured separately from each other in a conventional manner. As a result, such systems typically have a complex and / or space-consuming structure, separate amounts of oil, and / or at least partially duplicated components. Thus, systems known in the prior art having a lubricating oil circuit and a cooling oil circuit, such as a vehicle drive system having a single-speed or multi-speed transmission lubricated by the lubricating oil circuit and an electric motor cooled by the cooling oil circuit, are typically complex, space-consuming, expensive, and / or very heavy. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to construct and improve the above-mentioned system having a lubricating oil circuit and a cooling oil circuit such that it can be configured and / or operated more simply, more space-savingly, and / or weight-savingly.

[0008] The technical problem proposed by the present invention is solved by an oil reservoir for a system having a lubricating oil circuit and a cooling oil circuit, a system having a lubricating oil circuit and a cooling oil circuit, in particular a vehicle drive system having a transmission and / or bearings lubricated by the lubricating oil circuit, and a method for operating such a system.

[0009] The oil reservoir is particularly designed to distribute oil to the lubricating oil circuit and the cooling oil circuit.

[0010] Thus, the amount of oil can be used for both the lubricating oil circuit and the cooling oil circuit. Thereby, components such as oil collectors, oil pipelines, and possibly pumps can be optimized and / or reduced. As a result, the entire system can be simplified, and for example, the structural space and / or weight can be reduced, and / or it can be manufactured and / or operated inexpensively.

[0011] The oil reservoir can in particular be designed for a system, such as a vehicle drive train, which has a transmission and / or bearings lubricated by the lubricating oil circuit, in particular transmission bearings, and an electric motor cooled by the cooling oil circuit. For example, the oil reservoir can be designed for a system, such as a vehicle drive train, which includes a single-speed or multi-speed transmission lubricated by the lubricating oil circuit and includes a rotor and / or stator of an electric motor cooled by the cooling oil circuit.

[0012] In one embodiment of the oil reservoir, the oil reservoir is designed to supply oil mainly or preferentially to the oil circuit, in particular the lubricating oil circuit. Thus, the function of the main or preferential oil path can be ensured, and for example, sufficient lubrication or oil injection at the position of the transmission bearings (or as an alternative, always sufficient cooling) can be ensured.

[0013] In another embodiment of the oil reservoir, the oil reservoir has a first oil sump and a second oil sump. In this case, the first oil sump is designed to supply one of the oil circuits, and the second oil sump is designed to supply the other of the oil circuits. In particular, the first oil sump is used to supply the lubricating oil circuit, and the second oil sump is designed to supply the cooling oil circuit. Thus, the oil can be distributed to the two oil circuits in a simple manner.

[0014] The first oil sump and the second oil sump can each particularly have a bottom and at least one side wall.

[0015] In another embodiment of the oil reservoir, the second oil sump and at least one oil outlet are embedded in the bottom of the first oil sump. In this case, in particular, on the bottom of the first oil sump, an overflow element is formed that is raised relative to the bottom of the first oil sump. The overflow element can in particular have a height that is lower than at least one side wall of the first oil sump. When a specific oil level is reached in the first oil sump, particularly a liquid level corresponding to the height of the overflow element, the oil particularly flows from the first oil sump over the overflow element into the second oil sump. Thus, the oil can in particular be distributed to the two oil circuits in a simple manner. In this case, the oil circuit associated with the first oil sump, such as the lubricating oil circuit, is mainly or preferentially supplied through at least one oil outlet. Thus, a minimum oil quantity in the main or preferential oil circuit, for example for bearings, particularly for lubricating the transmission bearings, can be ensured. When the minimum oil quantity in the main or preferential oil circuit is exceeded, for example for lubricating the transmission bearings (which can be adjusted by the height of the overflow element), then oil can also be supplied to the secondary oil circuit, such as the cooling oil circuit.

[0016] For example, oil can be input into one of the oil circuits, particularly the lubricating oil circuit, from the first oil sump through at least one oil outlet of the first oil sump. In particular, the oil can be supplied from the first oil sump to the lubricating oil circuit through at least one oil outlet of the first oil sump. In this case, at least one oil outlet can in particular also be referred to as a lubricating oil outlet. In this way, the lubricating oil circuit is preferentially supplied with oil. For example, sufficient lubrication or oil injection at the position of the transmission bearings, for example, can always be ensured.

[0017] On the other hand, if the minimum oil quantity in the main or preferential oil circuit is exceeded, for example for lubrication (or alternatively for cooling), then a part of the oil from the first oil sump, particularly through the overflow element, flows into the second oil sump and is provided for the secondary oil circuit, for example for cooling (or alternatively for lubrication). The oil from the second oil sump can then be supplied to the secondary oil circuit, for example for cooling (or alternatively for lubrication), by a oil pump, for example.

[0018] In particular, the oil from the second oil reservoir can supply the cooling oil circuit. In this case, the oil pump can in particular also be referred to as a cooling oil pump. In this case, the cooling oil circuit is secondarily supplied with oil due to the lubricating oil circuit, for example in order to always ensure sufficient lubrication or oil injection at the transmission bearing positions.

[0019] In another embodiment of the oil reservoir, the bottom of the second oil reservoir is configured to sink relative to the bottom of the first oil reservoir. Thus, the oil suction volume of the second oil reservoir can be increased.

[0020] In another embodiment of the oil reservoir, at least one side wall of the oil reservoir, in particular of the first oil reservoir of the oil reservoir, is designed to receive the oil transmitted by a wheel for transmitting oil of a transmission gear, in particular a gear of a gear set, such as a transmission gear. For example, for this purpose, at least one side wall of the oil reservoir, in particular of the first oil reservoir of the oil reservoir, can have a slope and / or curvature that extends at least partially in a direction that is inclined substantially outwardly with respect to the inner cavity of the oil reservoir. Thus, the oil reservoir can receive the oil conveyed by at least one oil transmission wheel in a simple manner, and thus, for example, the first oil reservoir is filled.

[0021] In another embodiment of the oil reservoir, the overflow element forms a section of at least one side wall of the second oil reservoir. Thus, the structure of the oil reservoir can be simplified and / or the mechanical stability of the oil reservoir can be improved.

[0022] In another embodiment of the oil reservoir, the second oil reservoir is a suction container for the oil pump. Thus, the oil pump can be supplied with oil in a controlled manner. By using the second oil reservoir as a suction container for the oil pump, the air content of the oil sucked in by the oil pump (for example, compared to the oil sucked in from an oil sump or a collecting container that is turbulent during operation in the lower region of the transmission) can be significantly reduced. Thus, the functionality of the pump and the supplied oil circuit (such as the cooling oil circuit) is improved. In addition, by using the second oil reservoir as a suction container for the oil pump, it can be ensured that the oil pump does not draw cold oil with a poor viscosity (for example, from an oil sump or a collecting container in the lower region of the transmission) at low operating temperatures and convey it into an oil circuit, such as a cooling oil circuit, where the oil cannot flow back quickly enough due to its poor viscosity caused by its temperature and thus, for example, is drawn from an oil sump or a collecting container in the lower region of the transmission and thus, for example, can no longer supply the lubricating oil circuit.

[0023] The second oil reservoir can in particular have a pump interface for connecting the second oil reservoir to the suction side of the oil pump. The pump interface can for example be configured in the side wall of the second oil reservoir. For example, the pump interface serves as a transition position to the suction section of the oil pump. For example, the pump interface can be designed in the form of a pipe joint. Thus, the second oil reservoir can be connected to the oil pump in a simple manner.

[0024] In another embodiment of the oil reservoir, the second oil reservoir further comprises at least one oil drain port. The at least one oil drain port can in particular be embedded in the bottom of the second oil reservoir. For example, the at least one oil drain port is designed as an opening which is in particular relatively small, for example in the form of a hole. By means of the at least one oil drain port, the oil in the second oil reservoir can be conveyed to the oil sump or the oil collector during system shutdown, for example in the lower region of the transmission. Thus, it can be ensured that during system shutdown, the oil located in the second oil reservoir flows out and is available for subsequent system restart, for example for lubricating bearings. In order to ensure sufficient supply of the oil pump during system operation, the at least one oil drain port should be significantly smaller than the pump connection, or the at least one oil drain port only allows an oil flow rate which is significantly lower than that of the pump connection.

[0025] The system can in particular comprise at least one oil reservoir constructed as described above.

[0026] The system can in particular comprise a transmission and / or bearings lubricated with oil from the lubricating oil circuit, in particular transmission bearings, and an electric motor cooled with oil from the cooling oil circuit. For example, the system can be a vehicle driveline. The transmission can be, for example, a transmission with splash lubrication or dry sump lubrication.

[0027] In one embodiment of the system, the system is a vehicle driveline, in particular for an electric vehicle and / or a hybrid vehicle, which electric vehicle and / or hybrid vehicle comprises a single-speed or multi-speed transmission lubricated with oil from the lubricating oil circuit and a rotor and / or stator of an electric motor cooled with oil from the cooling oil circuit. In this case, the rotor of the electric motor can in particular have a hollow shaft-shaped rotor shaft and / or at least one rotor shaft bearing. In particular, the oil from the second oil reservoir, in particular by means of an oil pump, can be pumped through at least one hollow shaft, for example through the hollow shaft drive shaft of the transmission and / or through the hollow shaft-shaped rotor shaft, and / or reach at least one rotor shaft bearing.

[0028] In another embodiment of the system, the oil from the first oil reservoir can be conveyed, in particular through at least one oil outlet of the first oil reservoir, into one of the oil circuits, in particular the lubricating oil circuit, and the oil from the second oil reservoir can be conveyed into the other of the oil circuits, in particular the cooling oil circuit.

[0029] In another embodiment of the system, the system has an oil pump. In particular, the oil from the second oil reservoir can be drawn out by means of the oil pump. For example, the oil from the second oil reservoir can be fed into the other of the oil circuits, in particular the cooling oil circuit, by means of the oil pump. Here, the oil pump can also be referred to as a cooling oil pump. For example, by means of the oil pump, in particular the cooling oil pump, the oil is pumped and guided through at least one hollow shaft, for example through the hollow shaft-shaped drive shaft of the transmission and / or through the hollow shaft-shaped rotor shaft of the electric motor, and can thus be used, for example, for cooling the electric motor.

[0030] In another embodiment of the system, the system has at least one oil transfer wheel. The at least one oil transfer wheel can in particular be a transmission gear, for example a transmission gear of a gear set. In this case, the oil reservoir, in particular the first oil sump of the oil reservoir, can be filled with oil by means of the at least one oil transfer wheel. For example, the oil reservoir, in particular the first oil sump of the oil reservoir, can be filled with oil by receiving the oil conveyed by the at least one oil transfer wheel, for example through a side wall section of the oil reservoir or of the first oil sump.

[0031] In another embodiment of the system, the system has an oil collector. In this case, in particular the oil from the lubricating oil circuit and the oil from the cooling oil circuit can be collected in the oil collector. Furthermore, in particular the oil from the oil collector is conveyed by means of at least one oil transfer wheel into the oil reservoir, in particular into the first oil sump of the oil reservoir.

[0032] In particular, the lower part of the at least one oil transfer wheel is arranged in the oil collector. The upper part of the at least one oil transfer wheel can in particular be arranged above the oil reservoir, in particular above at least one oil collecting side wall of the first oil sump of the oil reservoir. Thus, during operation of the system, the at least one oil transfer wheel can dip into the oil located in the oil collector, and the oil is conveyed upwards by a rotational movement and into the oil reservoir, in particular into the first oil sump of the oil reservoir.

[0033] The method can in particular be designed for operating a system configured as described above.

[0034] In particular, in the method, the oil reservoir, in particular the first oil sump of the oil reservoir, is filled with oil from the oil collector by means of at least one oil transfer wheel, in particular a gear, for example a transmission gear of a wheel set. This can be done, for example, by collecting the oil conveyed by the at least one oil transfer wheel by means of the side wall of the oil reservoir, in particular of the first oil sump of the oil reservoir.

[0035] At least a part of the oil can be supplied from the oil reservoir, in particular from the first oil sump of the oil reservoir, to one of the oil circuits, in particular the lubricating oil circuit. In particular, at least a part of the oil from the first oil sump of the oil reservoir can be supplied to one of the oil circuits, in particular the lubricating oil circuit, via at least one oil outlet.

[0036] When a specific oil level is reached in the oil reservoir, in particular in the first oil sump of the oil reservoir, a part of the oil, in particular by means of an oil pump, for example is fed into another oil circuit, in particular the cooling oil circuit, from the second oil sump. In particular, when a specific oil level is reached in the first oil sump, in particular the oil level corresponding to the height of the overflow element, a part of the oil from the first oil sump is introduced via the overflow element into the second oil sump, and from the second oil sump, in particular by means of an oil pump, into another oil circuit, in particular the cooling oil circuit.

[0037] In particular, after passing through the lubricating oil circuit and the cooling oil circuit, the oil can be re-collected from the lubricating oil circuit and the cooling oil circuit into the oil collector.

[0038] Therefore, the above-mentioned disadvantages are avoided and the corresponding advantages are achieved.

[0039] There are now various feasible solutions to design and improve the oil storage device according to the invention, the system according to the invention, and the method according to the invention in an advantageous manner. The present invention provides a system having a lubricating oil circuit and a cooling oil circuit, in particular a vehicle drive train, which vehicle drive train has a transmission and / or bearings lubricated with oil from the lubricating oil circuit, and an electric motor cooled with oil from the cooling oil circuit, wherein the system has the aforementioned oil storage device. The present invention also provides a method for operating this system. According to the invention, the oil storage device, in particular the first oil storage tank of the oil storage device, is filled with oil from the oil collector by means of at least one oil delivery wheel, at least a part of the oil from the oil storage device, in particular from the first oil storage tank of the oil storage device, is input into one of the oil circuits, in particular the lubricating oil circuit, and when a specific oil level is reached in the oil storage device, in particular in the first oil storage tank of the oil storage device, in particular by means of an oil pump, a part of the oil is input into another oil circuit, in particular the cooling oil circuit, and the oil from the lubricating oil circuit and the oil from the cooling oil circuit are again collected in the oil collector. Description of the Drawings

[0040] In the following, some preferred embodiments of the oil storage device, the system, and the method according to the invention are explained in more detail with reference to the drawings. In the drawings:

[0041] Figure 1 A schematic diagram showing an embodiment of the system according to the invention, which system is equipped with a lubricating oil circuit and a cooling oil circuit, and which system is equipped with an embodiment of the oil storage device according to the invention.

[0042] Figure 2 A schematic cross-sectional view showing a specific embodiment of the system according to the invention, which system has a lubricating oil circuit and a cooling oil circuit, and which system is equipped with a specific embodiment of the oil storage device according to the invention,

[0043] Figure 3 A schematic perspective view showing another specific embodiment of the system according to the invention, which system has a lubricating oil circuit and a cooling oil circuit, and which system is equipped with a specific embodiment of the oil storage device according to the invention having a different shape.

[0044] Figure 4 and 5 showing Figure 3 a schematic perspective view of the embodiment of the oil storage device according to the invention shown in

[0045] Figure 6FIG. 0 is a schematic cross-sectional view of another specific embodiment of the system according to the present invention, the system having a lubricating oil circuit and a cooling oil circuit. Specific Embodiment

[0046] Figure 1 FIG. 6 shows an embodiment of a system 100 according to the present invention, for example, a vehicle drivetrain, which includes a transmission 20 with bearings (especially transmission bearings 21) lubricated by a lubricating oil circuit S, an electric machine 30 having a rotor 31 cooled by a cooling oil circuit K, and an embodiment of an oil reservoir 10 according to the present invention, and Figure 1 FIG. 8 shows the principle of distributing oil to the lubricating oil circuit S and the cooling oil circuit K according to the present invention and the principle of oil delivery according to the present invention.

[0047] Figure 1 FIG. 12 shows that the oil reservoir 10 is designed to distribute the oil 1 to the lubricating oil circuit S and the cooling oil circuit K. In this case, the oil reservoir 10 preferentially supplies the oil 1 to the lubricating oil circuit S. To this end, the oil reservoir 10 has a first oil sump 11 for supplying oil to the lubricating oil circuit S and a second oil sump 12 for supplying oil to the cooling oil circuit K. The first oil sump 11 and the second oil sump 12 each have a bottom 11a, 12a and at least one side wall 11b, 12b.

[0048] Figure 1 FIG. 16 shows that the second oil sump 12 and at least one oil outlet 13 are embedded in the bottom 11a of the first oil sump 11. Here, the oil 1 first enters the lubricant circuit S from the first oil sump 11 through at least one oil outlet 13. Here, the oil 1 is guided or dripped through at least one oil outlet 13 onto the transmission bearing 21 arranged below, and is received by an oil collector 101 arranged below the transmission bearing 21. Thus, oil injection of the transmission bearing 21 can be achieved in a simple manner.

[0049] Figure 1It shows that on the bottom 11a of the first oil storage tank 11, there is an overflow element 14 (in the form of a flange) that is raised relative to the bottom of the first oil storage tank 11 and thus also relative to at least one oil outlet 13. This overflow element 14 simultaneously forms a section of at least one side wall 12b of the second oil storage tank 12. The bottom 12b of the second oil storage tank 12 is formed deeper than or at a lower level than the bottom 11a of the first oil storage tank 11. When a specific oil level N corresponding to the height H of the overflow element 14 is reached in the first oil storage tank 11, the oil can overflow from the first oil storage tank 11 via the overflow element 14 into the second oil storage tank 12. The second oil storage tank 12 serves as the suction area or suction container of the oil pump 15. In this case, the second oil storage tank 12 has, for example, a pump connection for connecting the second oil storage tank 12 to the suction side or suction channel of the oil pump 15, which can be formed in the form of a pipe joint, for example. In this way, the oil pump 15 can supply the oil 1 in a controlled manner, and the oil 1 is pumped from the second oil storage tank 12 through the hollow shaft-shaped rotor shaft 32 by means of the oil pump 15 and thus especially into the space outside the transmission, i.e., the space of the rotor shaft, for cooling the components of the electric motor. If the oil level N in the first oil storage tank 11 drops again such that it no longer exceeds the height H of the overflow element 14, the oil 1 is again only provided for the lubricating oil circuit S. Therefore, the oil 1 can be easily distributed to the lubricating oil circuit S and the cooling oil circuit K, where the lubricating oil circuit S is preferentially supplied with the oil 1. Here, the priority of the lubricating oil circuit S can be adjusted by the height H of the overflow element 14.

[0050] Figure 1 It shows that the rotor 31 of the electric motor 30 is arranged on the hollow shaft-shaped rotor shaft 32 and is rotatably supported by the rotor shaft bearing 31b. Here, the rotor 31 is oil-cooled by the cooling oil circuit K, and the oil 1 is pumped from the second oil storage tank 12 through the hollow shaft-shaped rotor shaft 32 by means of the oil pump 15.

[0051] Figure 1 It also shows that the oil 1 from the lubricating oil circuit S and the oil 1 from the cooling oil circuit K are collected in the oil collector 101.

[0052] Figure 1 It also shows that the lower part of at least one oil-transferring driving gear 22 of the gear set of the transmission 20 is arranged in the oil collector 101 and the upper part is arranged above the side wall 11b of the oil storage tank 10 (especially the first oil storage tank 11 of the oil storage tank 10). Therefore, at least one oil-transferring driving gear 22 is immersed in the oil 1 located in the oil storage tank 101, and the oil 1 is carried upward by the rotational movement and is conveyed (for example, brought in by the blades) into the first oil storage tank 11 of the oil storage tank 10 and thus fills the oil 1.

[0053] Figure 2Shows a specific embodiment of the system 100 according to the present invention, such as a vehicle powertrain, which includes a transmission 20 with bearings (especially transmission bearings 21) lubricated by a lubricating oil circuit S, a motor 30 with a rotor 31 cooled by a cooling oil circuit K, and a specific embodiment of the oil reservoir 10 according to the present invention. In Figure 2 The embodiment of the system 100 and the oil reservoir 10 according to the present invention shown in Figure 1 differs basically only in the specific exemplary construction and layout of the components combined

[0054] As Figure 1 a supplement, Figure 2 shows that the side wall 11b of the oil reservoir 10, especially the side wall 11b of the first oil storage tank 11 of the oil reservoir 10, is designed to collect the oil conveyed by at least one oil transmission gear 22. In this case, the side wall 11b of the oil reservoir 10, especially the side wall 11b of the first oil storage tank 11 of the oil reservoir 10, especially has a slope and / or curvature that extends substantially obliquely outward relative to the interior of the oil reservoir 10 and the first oil storage tank 11 of the oil reservoir 10, and extends near the outer diameter of at least one oil transmission gear 22 and extends substantially parallel to it. Therefore, the oil 1 conveyed by at least one oil transmission gear 22 can be collected in a simple manner through the side wall 11b of the oil reservoir 10, especially the side wall 11b of the first oil storage tank 11 of the oil reservoir 10, and thus the oil reservoir 10, especially the first oil storage tank 11 of the oil reservoir 10, is filled.

[0055] As Figure 1 a supplement, Figure 2 also shows that the second oil storage tank 12 has a pump interface 12c for connecting the second oil storage tank 12 to the suction side 15a of the oil pump 15 in particular, and the pump interface 12c is designed in the form of a pipe joint in the side wall of the second oil storage tank 12.

[0056] Figure 3 Shows another specific embodiment of the system 100 according to the present invention, such as a vehicle powertrain, which includes a transmission 20 with transmission bearings 21 lubricated by oil from a lubricating oil circuit S, and a motor (not shown) oil-cooled by a cooling oil circuit K, and another specific embodiment of the oil reservoir 10 according to the present invention. In Figure 3 The embodiment of the system 100 and the oil reservoir 10 according to the present invention shown in Figure 1 and 2 differs basically only in the specific exemplary construction and layout of the components combined

[0057] As Figure 1 and 2 a supplement, Figure 3It is shown that oil 1 is input through the pressure side 15b of an oil pump 15 into a hollow shaft-shaped drive shaft and the rotor shaft (not shown) of a motor for oil cooling thereof.

[0058] As a schematic perspective view, Figure 4 and 5 it is shown Figure 3 an embodiment of an oil reservoir according to the present invention as shown in

[0059] As Figure 3 and Figure 4 a supplement to Figure 5 it is shown that the second oil reservoir 12 further includes at least one oil drain port 12d. The at least one oil drain port 12d may in particular be embedded in the bottom of the second oil reservoir 12. Through the at least one oil drain port 12d, the oil 1 present in the second oil reservoir 12 when the system stops operating can be input into the second oil reservoir 12 again. Thus, it can be ensured that the oil 1 present during the stop of the system in the second oil reservoir 12 flows away and can be used again for lubricating the gearbox bearings for subsequent restart of the system. Figure 4 It is shown that in order to ensure sufficient supply of the oil pump 15 during system operation, at least one oil drain port 12d is significantly smaller than the pump connection 12c, and in particular only allows a significantly lower oil flow rate than the pump connection 12c.

[0060] Figure 6 It is shown another specific embodiment of a system 100 according to the present invention, in particular a vehicle powertrain, which includes a transmission 20 lubricated by a lubricating oil circuit, a rotor 31 of a motor 30 cooled by a cooling oil circuit K, and an embodiment of an oil reservoir 10 according to the present invention. In Figure 6 the difference between the embodiment of the system 100 and the oil reservoir 10 according to the present invention shown in Figures 1 to 3 is basically only in the specific exemplary construction and layout of the components combined

[0061] Figure 6 In particular, it is shown that in a specific embodiment, the oil 1 passing through the pressure side 15b of the oil pump 15 is axially introduced into the hollow shaft-shaped drive shaft 25 of the transmission 20 through a cooling oil passage 24 integrated in the gearbox housing part 23, and is guided through the hollow shaft-shaped rotor shaft 32 of the rotor 31 of the motor 30 which is axially connected to the drive shaft 25. In order to control the cooling oil circuit K, the hollow shaft-shaped drive shaft 25 of the transmission 20 is equipped with baffles and / or can-shaped baffles, especially at its end (where the oil 1 is axially introduced).

[0062] List of reference numerals

[0063] 1 Oil

[0064] 10 Oil reservoir

[0065] 11 First oil storage tank

[0066] 11a Bottom of the first oil storage tank

[0067] 11b Side wall of the first oil storage tank

[0068] 12 Second oil storage tank

[0069] 12a Bottom of the second oil storage tank

[0070] 12b Side wall of the second oil storage tank

[0071] 12c Pump connection

[0072] 12d Oil drain port

[0073] 13 Oil outlet

[0074] 14 Overflow element

[0075] 15 Oil pump

[0076] 15a Suction side of the oil pump

[0077] 15b Pressure side of the oil pump

[0078] 20 Transmission

[0079] 21 Transmission bearing

[0080] 22 Transmission gear

[0081] 23 Transmission housing part

[0082] 24 Cooling oil passage

[0083] 25 Drive shaft

[0084] 30 Motor

[0085] 31 Rotor

[0086] 32 Rotor shaft

[0087] 31b Rotor shaft bearing

[0088] 100 System

[0089] 101 Oil collector

[0090] S Lubricating oil circuit

[0091] K Cooling oil circuit

[0092] H Height of the overflow element

[0093] N Oil level

Claims

1. An oil reservoir (10) for a system having a lubricating oil circuit (S) and a cooling oil circuit (K), the system having a transmission (20) and / or bearings (21) lubricated with oil from the lubricating oil circuit (S), and an electric motor (30) cooled with oil from the cooling oil circuit (K), characterized in that, The oil reservoir (10) is designed to distribute oil (1) into the lubricating oil circuit (S) and the cooling oil circuit (K), wherein the oil reservoir (10) is designed to preferentially supply oil (1) to the lubricating oil circuit (S), wherein the oil reservoir (10) has a first oil storage tank (11) and a second oil storage tank (12), wherein the first oil storage tank (11) is designed to supply oil to the lubricating oil circuit (S), and the second oil storage tank (12) is designed to supply oil to the cooling oil circuit (K), wherein the first oil storage tank (11) and the second oil storage tank (12) each have a bottom (11a, 12a) and at least one side wall (11b, 12b), wherein the second oil storage tank (12) and at least one oil outlet (13) are embedded in the bottom (11a) of the first oil storage tank (11), wherein an overflow element (14) raised relative to the bottom (11a) of the first oil storage tank (11) is formed on the bottom (11a) of the first oil storage tank (11), wherein when the oil level corresponding to the height (H) of the overflow element (14) is reached in the first oil storage tank (11), the oil (1) is introduced from the first oil storage tank (11) over the overflow element (14) into the second oil storage tank (12), wherein the overflow element is located inside the first oil storage tank and simultaneously forms a section of at least one side wall of the second oil storage tank.

2. The oil storage device (10) according to claim 1, characterized in that, The bottom (12a) of the second oil storage tank (12) is configured to sink relative to the bottom (11a) of the first oil storage tank (11).

3. The oil storage device (10) according to claim 2, characterized in that, At least one side wall (11b) of the first oil storage tank (11) of the oil reservoir (10) is designed to receive the oil (1) transmitted by at least one oil transfer wheel.

4. The oil storage device (10) according to claim 1, characterized in that, The overflow element (14) forms a section of at least one side wall (12b) of the second oil storage tank (12).

5. The oil reservoir (10) according to claim 1, characterized in that The second oil storage tank (12) is a suction container for the oil pump (15), wherein the second oil storage tank (12) has a pump interface (12c) for connecting the second oil storage tank (12) to the suction side (15a) of the oil pump (15), wherein the pump interface (12c) is constructed in the side wall (12b) of the second oil storage tank (12).

6. The oil storage device (10) according to claim 1, characterized in that, The second oil storage tank (12) has at least one oil drain port (12d), wherein at least one oil drain port (12d) is embedded in the bottom (12b) of the second oil storage tank (12).

7. A system (100) having a lubricating oil circuit (S) and a cooling oil circuit (K), the system having a transmission (20) and / or a bearing (21) lubricated by oil of the lubricating oil circuit (S), and an electric motor (30) cooled by oil of the cooling oil circuit (K), characterized in that The system (100) has an oil reservoir (10) according to any one of the preceding claims 1 to 6.

8. The system (100) according to claim 7, characterized in that, The system (100) has an oil pump (15), the oil pump being a cooling oil pump, wherein the oil (1) can be pumped out of the second oil storage tank (12) by means of the oil pump (15).

9. The system (100) according to claim 7 or 8, characterized in that, The oil (1) can be input into the lubricating oil circuit (S) from the first oil storage tank (11) through at least one oil outlet (13) of the first oil storage tank (11), and the oil (1) can be input into the cooling oil circuit (K) from the second oil storage tank (12).

10. The system (100) according to claim 7, characterized in that, The system (100) has at least one oil transfer wheel (22), which is a transmission gear, wherein the first oil storage tank (11) of the oil reservoir (10) can be filled with oil (1) by means of at least one oil transfer wheel (22).

11. The system (100) according to claim 7, wherein, The system (100) comprises an oil collector (101), wherein oil (1) from a lubricating oil circuit (S) and oil (1) from a cooling oil circuit (K) can be collected in the oil collector (101), and wherein the oil (1) from the oil collector (101) is conveyed to a first oil reservoir (11) of the oil reservoir (10) via at least one oil transfer vessel (22).

12. The system (100) according to claim 7, characterized in that The system is a vehicle transmission comprising a single-speed transmission or a multi-speed transmission (20) lubricated by oil from a lubricating oil circuit (S) and a rotor (31) and / or a stator (32) of an electric machine (30) cooled by oil from a cooling oil circuit (K).

13. A method for operating a system (100) according to one of claims 7 to 12, characterized in that - filling the first oil reservoir (11) of the oil reservoir (10) with oil (1) from the oil collecting tank (101) via at least one oil tanker (22), - feeding at least a portion of the oil (1) from the first oil reservoir (11) of the oil reservoir (10) into the lubricating oil circuit (S) in the oil circuit, wherein when a specific oil level (N) is reached in the first oil reservoir (11) of the oil reservoir (1), a portion of the oil (3) is fed into the cooling oil circuit (K) by means of an oil pump (15), and The oil (1) from the lubricating oil circuit (S) and the oil (1) from the cooling oil circuit (K) are collected in the oil collector (101).

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