Drive arrangement and a vehicle with a drive arrangement

Abstract

The invention relates to a drive arrangement (10) having the features of claim 1 and to a vehicle having such a drive arrangement (10).

Description

[0001] R.415365

[0002] - 1 -

[0003] Description

[0004] title

[0005] drive arrangement and a vehicle with a drive arrangement

[0006] State of the art

[0007] The invention relates to a drive arrangement with features of claim 1 and a vehicle with such a drive arrangement.

[0008] In drive systems with an electric motor, heat is generated during operation. To prevent overheating of the drive system and especially the electric motor, this heat can be dissipated, for example, by means of a heat exchanger. A cooling circuit can be provided for this purpose, in which a coolant is circulated by a pump through the electric motor.

[0009] Depending on the driving situation, e.g., at low temperatures or during a cold start, it may be necessary to retain heat in the cooling circuit to reach operating temperature as quickly as possible. For this purpose, the heat exchanger can be bypassed.

[0010] DE 102016211 226 B3 discloses a lubricant supply for a drive train in an electrically powered motor vehicle. The lubricant supply includes a heat exchanger, wherein the flow through the heat exchanger can be controlled by means of a valve and a bypass line.

[0011] The disadvantage is that bypassing the heat exchanger is complex and not implemented in a cost- or energy-efficient manner. R.415365

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[0013] Disclosure of the invention

[0014] According to the invention, a drive arrangement for a vehicle, in particular a motor vehicle, is proposed. The drive arrangement comprises a cooling circuit in which a coolant is or can be circulated. The cooling circuit comprises an electric machine with a stator and a rotor, wherein the electric machine, the stator, and / or the rotor are or can be supplied with the coolant. The cooling circuit comprises a transmission. The transmission is configured for transmitting torque. The cooling circuit comprises a heat exchanger. The heat exchanger is configured for cooling the coolant. The cooling circuit comprises a bypass line. The bypass line is configured to bypass the heat exchanger. The cooling circuit comprises an electromagnetic 3 / 2-way valve. The 3 / 2-way valve is configured to move from a first position to a second position and / or vice versa.In the first position, the coolant is routed through the heat exchanger. In the second position, the coolant is routed through the bypass line. It is also conceivable that in the first position the coolant is routed through the bypass line and in the second position the coolant is routed through the heat exchanger, meaning the valve connections of the 3 / 2-way valve can be reversed.

[0015] The 3 / 2-way gun has in particular three ports and is designed to be convertible into two positions.

[0016] The coolant can be a fluid, a (cooling) liquid, especially oil.

[0017] This allows for a cost- and energy-efficient bypass of the heat exchanger using simple means.

[0018] The drive arrangement can, for example, be designed as an e-axle or form a component of an e-axle.

[0019] According to a further development of the drive arrangement, the 3 / 2-way valve can be designed such that the 3 / 2-way valve in the second position is operated by means of R.415365

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[0021] a constant current can be maintained on an electromagnetic coil of the 3 / 2-way valve.

[0022] This allows the 3 / 2-way valve to be reliably moved into the second position and / or held in the second position using simple means.

[0023] According to a further development of the drive arrangement, the 3 / 2-way valve can be designed in such a way that the 3 / 2-way valve can be held in the second position by means of a hydraulic force.

[0024] This allows the 3 / 2-way valve to be reliably moved into the second position and / or held in the second position using simple means.

[0025] According to a further development of the drive arrangement, the 3 / 2-way valve can be designed in such a way that the 3 / 2-way valve can be held in the second position without current.

[0026] This can further improve the energy efficiency of the 3 / 2-way valve.

[0027] According to a further development of the drive arrangement, the 3 / 2-way valve can be pre-tensioned into the first position by means of a spring of the 3 / 2-way valve.

[0028] This allows the 3 / 2-way valve to be moved into the first position and / or held in the first position using simple means and, in particular, without power. This further improves the energy efficiency of the 3 / 2-way valve.

[0029] According to a further development of the drive arrangement, the heat exchanger can be thermally coupled to an external cooling circuit. The external cooling circuit can be configured to dissipate heat externally.

[0030] This allows for further optimization of the efficiency of the cooling circuit and thus of the drive system. R.415365

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[0032] According to a further development of the drive arrangement, the cooling circuit can include a coolant pump. The coolant pump can be configured to circulate the coolant within the cooling circuit.

[0033] This allows the coolant to be circulated within the cooling circuit using simple means.

[0034] According to a further development of the drive arrangement, the cooling circuit can include at least one filter. The filter can be designed to filter the coolant.

[0035] This allows the coolant to be filtered using simple means, thus further optimizing the efficiency of the cooling circuit and therefore the drive system.

[0036] According to a further development of the drive arrangement, the cooling circuit can include a coolant reservoir. The coolant reservoir can be designed to store the coolant. The coolant reservoir can be configured as a coolant sump.

[0037] This allows the coolant to be stored using simple means.

[0038] According to the invention, a vehicle, in particular a motor vehicle, with a drive arrangement as described above is proposed.

[0039] Regarding the advantages achievable with the vehicle, reference is made to the relevant explanations concerning the drive arrangement. The measures described in connection with the drive arrangement and / or those explained below can be used for further vehicle development.

[0040] Embodiments of the invention are explained below with reference to the accompanying drawings. These show:

[0041] Figure 1 shows a schematic representation of a drive arrangement and R.415365

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[0043] Figure 2 shows a schematic sectional view of a 3 / 2-way valve of the actuator arrangement according to Figure 1 according to a first embodiment and

[0044] Figure 3 shows a schematic sectional view of the 3 / 2-way valve of the drive arrangement according to Figure 1 according to a second embodiment.

[0045] The drive assembly is designated by reference numeral 10 in Figure 1. The drive assembly 10 is designed for a vehicle, in particular a motor vehicle. The drive assembly 10 comprises a cooling circuit 12 in which a coolant is or can be conveyed.

[0046] The cooling circuit 12 comprises an electric machine 14 with a stator 16 and a rotor 18. The electric machine 14, the stator 16, and / or the rotor 18 are supplied with, or can be supplied with, the coolant. The cooling circuit 12 includes a gearbox 20. The gearbox 20 is configured to transmit torque. The gearbox 20 can also be supplied with the coolant. In this case, the coolant acts as a lubricant. The torque can be generated by the electric machine 14. The cooling circuit 12 includes a heat exchanger 22. The heat exchanger 22 is configured to cool the coolant. The cooling circuit 12 includes a bypass line 24. The bypass line 24 is configured to bypass the heat exchanger 22. The cooling circuit 12 includes an electromagnetic 3 / 2-way valve 26. The 3 / 2-way valve 26 is designed to be switchable from a first position to a second position and / or vice versa.In the first position, the coolant is routed through the heat exchanger 22. In the second position, the coolant is routed through the bypass line 24. The 3 / 2-way valve 26 can be positioned upstream of the heat exchanger 22 and / or upstream of the bypass line 24 in the direction of coolant flow.

[0047] The 3 / 2-way valve 26 can be designed such that the 3 / 2-way valve 26 can be held in the second position by means of a constant current supply to an electromagnetic coil 28 of the 3 / 2-way valve 26. R.415365

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[0049] The 3 / 2-way valve 26 can be designed such that the 3 / 2-way valve 26 can be held in the second position by means of a hydraulic force.

[0050] The 3 / 2-way valve 26 can be designed such that the 3 / 2-way valve 26 can be held in the second position when de-energized.

[0051] The 3 / 2-way valve 26 can include a spring 30. The 3 / 2-way valve 26 can be pre-tensioned into the first position by means of the spring 30.

[0052] The heat exchanger 22 can be thermally coupled to an external cooling circuit 31.

[0053] The cooling circuit 12 can include a coolant pump 32. The coolant pump 32 can be configured to circulate the coolant within the cooling circuit 12.

[0054] The cooling circuit 12 can include at least one filter 34. The filter 34 can be configured to filter the coolant. In this case, the cooling circuit 12 includes two filters 34. A first filter 34 is arranged upstream of the coolant pump 32 in the direction of coolant flow. A second filter 34 is arranged downstream of the coolant pump 32 in the direction of coolant flow. The coolant pump 32 is located between the two filters 34.

[0055] The cooling circuit 12 can include a coolant reservoir 36. The coolant reservoir 36 can be configured to store the coolant. The coolant reservoir 36 can be located upstream of the coolant pump 32 in the direction of coolant flow. The first filter 34 can be located between the coolant reservoir 36 and the coolant pump 32.

[0056] Figure 2 shows a schematic sectional view of the 3 / 2-way valve 26 of the drive arrangement 10 according to Figure 1 according to a first embodiment.

[0057] The illustrated 3 / 2-way valve 26 comprises three ports. A first port 38 is fluidically coupled to the bypass line 24. A second port 40 is fluidically coupled to the coolant pump 32. (R.415365)

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[0059] The second filter 34 is arranged between the second connection 40 and the coolant pump 32. A third connection 42 is fluidically coupled to the heat exchanger 22.

[0060] In this context, a fluidic connection or fluidic coupling means that a fluid (coolant) can flow between two fluidically coupled elements or between two elements in fluidic connection (e.g. first connection 38, second connection 40, third connection 42 and / or coolant pump 32).

[0061] The illustrated 3 / 2-way valve 26 comprises an electromagnetic coil 28 for generating a magnetic force. The 3 / 2-way valve 26 includes an armature 44 arranged within the coil 28 and movable by means of the magnetic force of the coil 28. The 3 / 2-way valve 26 includes a piston 46 that interacts with the armature 44. The piston 46 can be arranged on or connected to the armature 44. It is also conceivable that the piston 46 and the armature 44 can be designed as two separate parts that are not connected to each other. The 3 / 2-way valve 26 includes a valve disc 48. The valve disc 48 is arranged on the piston 46. The armature 44, the piston 46, and / or the valve disc 48 are movable.

[0062] In the first position (shown in Figure 2) of the 3 / 2-way valve 26, the armature 44, the piston 46 and / or the valve disc 48 are arranged such that the second port 40 and the third port 42 are fluidically coupled to each other. In the first position of the 3 / 2-way valve 26, the armature 44, the piston 46 and / or the valve disc 48 are arranged such that the first port 38 is fluidically decoupled from the second port 40 and / or the third port 42.

[0063] In the second position (not shown) of the 3 / 2-way valve 26, the armature 44, the piston 46 and / or the valve disc 48 are arranged such that the first port 38 and the second port 40 are fluidically coupled to each other. In the second position of the 3 / 2-way valve 26, the armature 44, the piston 46 and / or the valve disc 48 are arranged such that the third

[0064] - 8 -

[0065] The connection 42 is fluidically decoupled from the first connection 38 and / or the second connection 40.

[0066] The illustrated 3 / 2-way valve 26 is designed such that it can be held in the second position by means of a constant current applied to the electromagnetic coil 28 of the 3 / 2-way valve 26. By discontinuing the current to the coil 28, the 3 / 2-way valve 26 can be moved to the first position by means of the spring force (preload force) of the spring 30. To move the 3 / 2-way valve 26 to the second position, the coil 28 can be energized again. The illustrated 3 / 2-way valve 26 could be a pressure-balanced valve.

[0067] Figure 3 shows a schematic sectional view of the 3 / 2-way valve 26 of the actuator assembly 10 according to Figure 1, according to a second embodiment. The second embodiment differs from the first embodiment shown in Figure 2 in the following ways:

[0068] The 3 / 2-way valve 26 is designed such that it can be held in the second position by means of a hydraulic force. The hydraulic force can act on the valve disc 48 through the second port 40 and lock it in the second position of the 3 / 2-way valve 26. The 3 / 2-way valve 26 can thus be held in the second position without being de-energized. Energizing the coil 28 is not necessary for this. To move the 3 / 2-way valve 26 to the first position, the hydraulic force can be (briefly) reduced or interrupted, for example, by (briefly) stopping or reducing the coolant flow. It is also conceivable that a magnetic force is generated by the coil 28 to move the 3 / 2-way valve 26 to the first position (briefly), which moves the armature 44 to the left in Figure 3.The 3 / 2-way valve 26 shown may be a "self-sustained valve".

Claims

R.415365 - 9 - Claims 1. Drive arrangement (10) for a vehicle, in particular a motor vehicle, with a cooling circuit (12) in which a coolant is or can be conveyed, comprising: electric machine (14) with a stator (16) and a rotor (18), wherein the electric machine (14), the stator (16) and / or the rotor (18) are supplied or can be supplied with the coolant, a gearbox (20) for transmitting a torque, a heat exchanger (22) for cooling the coolant, a bypass line (24) for bypassing the heat exchanger (22), an electromagnetic 3 / 2-way valve (26), wherein the 3 / 2-way valve (26) is designed to be convertible from a first position in which the coolant is directed through the heat exchanger (22) to a second position in which the coolant is directed through the bypass line (24), and / or vice versa.

2. Drive arrangement (10) according to claim 1, characterized in that the 3 / 2-way valve (26) is designed such that the 3 / 2-way valve (26) can be held in the second position by means of a constant current supply to an electromagnetic coil (28) of the 3 / 2-way valve (26).

3. Drive arrangement (10) according to claim 1, characterized in that the 3 / 2-way valve (26) is designed such that the 3 / 2-way valve (26) can be held in the second position by means of a hydraulic force.

4. Drive arrangement (10) according to the preceding claim, characterized in that the 3 / 2-way valve (26) is designed such that the 3 / 2-way valve (26) is held in the second position when de-energized. R.415365 - 10 - can.

5. Drive arrangement (10) according to one of the preceding claims, characterized in that the 3 / 2-way valve (26) is pre-tensioned to the first position by means of a spring (30) of the 3 / 2-way valve (26).

6. Drive arrangement (10) according to one of the preceding claims, characterized in that the heat exchanger (22) is thermally coupled to an external cooling circuit (31).

7. Drive arrangement (10) according to one of the preceding claims, characterized in that the cooling circuit (12) comprises a coolant pump (32) for pumping the coolant within the cooling circuit (12).

8. Drive arrangement (10) according to one of the preceding claims, characterized in that the cooling circuit (12) comprises at least one filter (34), in particular two filters (34), for filtering the coolant.

9. Drive arrangement (10) according to one of the preceding claims, characterized in that the cooling circuit (12) comprises a coolant reservoir (36) for storing the coolant.

10. Vehicle, in particular motor vehicle, with a drive arrangement (10) according to one of the preceding claims.

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