Drive device for a motor vehicle and motor vehicle

Abstract

The invention relates to a drive arrangement (10) for a motor vehicle, having: - at least one electric machine (12); - a transmission (14), by means of which the electric machine (12) can electrically drive the motor vehicle; - at least one shift element (16), by means of which at least one gear of the transmission (14) can be switched by actuating the shift element (16); - at least one circuit (20), which can be flowed through by a medium and has a first branch (22), which can be flowed through by the medium in order to cool and / or lubricate the electric machine (12) and / or the transmission (14), and a second branch (34), which can be flowed through by the medium in order to actuate the shift element (16); and - at least one electric pump (36) for conveying the medium through the first circuit (20). The drive arrangement further comprises a parking lock (42). The circuit has a third branch (44), which can be flowed through by the medium in order to actuate the parking lock (42).

Description

TECHNICAL FIELD

[0001] The application relates to a drive device for a motor vehicle, in particular a passenger car. Furthermore, the application relates to a motor vehicle, in particular a passenger car. BACKGROUND

[0002] From DE 10 2009 026 709 A1 a unit is known which has at least one shift element which is arranged in a transmission housing and which can be acted upon hydraulically by pressure medium from a pressure medium supply in order to engage and disengage at least one component of the transmission. SUMMARY

[0003] The task of the application is to provide a drive device for a motor vehicle and a motor vehicle having such a drive device, with which particularly advantageous drive device operation can be achieved.

[0004] The task is achieved by a drive device and a motor vehicle having the features described below.

[0005] A first aspect of the application relates to a drive device for a motor vehicle, which is preferably designed as a passenger car, in particular a passenger car. This means that the motor vehicle comprises the drive device in its finished state of manufacture and can be driven electrically, in particular purely electrically, by means of the drive device. In other words, it is preferably provided that the drive device is an electric drive system, by means of which the motor vehicle can be driven purely electrically, in particular. It is therefore preferably provided that the motor vehicle is designed as an electric vehicle, in particular a battery electric vehicle (BEV). The drive device comprises at least one electric machine and a transmission, by means of which the motor vehicle can be driven electrically, in particular purely electrically, by means of the electric machine. In order to achieve particularly high electrical power for the purely electric drive of the motor vehicle, it is preferably provided that the electric machine is designed as a high-voltage component, the voltage, in particular the operating voltage or the rated voltage, of which is preferably at least 48 volts, in particular at least 50 volts and more particularly at least 60 volts. The voltage, in particular the operating voltage or the rated voltage, of the electric machine is preferably in the range of several hundred volts. In order to drive the motor vehicle electrically by means of the electric machine, the electric machine is operated, for example, as a motor and thus as an electric motor. To this end, the electric machine is supplied with electrical energy or electrical current, which is provided, for example, by a motor vehicle energy store which is designed as a battery, in particular as a high-voltage battery (HV battery). This means that the gears can be engaged and disengaged. If a gear is engaged, the motor vehicle can be driven by means of the electric machine by means of the transmission and thus by means of the engaged gear. If a gear is disengaged, the motor vehicle cannot be driven by means of the electric machine by means of the gear. The drive device, in particular the transmission, has at least one shift element, by means of which the gears of the transmission can be switched by actuating the shift element. This means that the gears can be engaged and / or disengaged by actuating the shift element. In order to actuate the shift element, the shift element is supplied, as will be described in more detail below, with a preferably liquid medium or is acted upon by the medium.

[0006] The drive device also has at least one circuit through which the medium can flow. The medium is preferably a liquid, in particular oil, so that the medium is also referred to as hydraulic medium. The circuit can therefore also be referred to as a hydraulic circuit or a hydrodynamic circuit. The circuit has a first branch and a second branch, which is preferably at least partially separated from the first branch, in particular spatially and / or fluidically. The first branch can be flowed through by the medium in order to cool and / or lubricate the electric machine and / or the transmission. In other words, the electric machine and / or the transmission can be cooled and / or lubricated by means of the medium and by means of the first branch, in particular in that at least a part of the transmission and / or the electric machine is supplied or can be supplied with the medium via the first branch. The medium is therefore used as a cooling medium and / or a lubricating medium, in particular with respect to the cooling and / or lubrication of the electric machine or the transmission, i.e. the electric machine or the transmission can be supplied or is supplied with the medium via the first branch in order to cool and / or lubricate the electric machine or the transmission by means of the medium. The second branch can be flowed through by the medium in order to actuate the shift element. This means that the medium is used as an actuating medium with respect to the second branch and the shift element in order to actuate the shift element and thus the shift by means of the actuating medium. For this purpose, the shift element can be supplied or is supplied with the medium via the second branch. In particular, the shift element can be actuated by means of the medium in that the shift element is supplied with the medium and thus, in particular, subjected to the medium via the second branch. By subjecting the shift element to the medium, a switching part of the shift element can be moved, in particular translationally and / or relative to the transmission housing, in order to shift or cause a shift.

[0007] The drive device also comprises at least one electric pump for conveying the medium through the circuit. In other words, the electric pump is electrically operable. By means of the electrical operation of the pump, the medium is conveyed by means of the pump, wherein the medium can be conveyed through the circuit and thus the branches by means of the pump. The electric pump comprises, for example, a conveying element which is accommodated in a pump body and is movable, in particular rotatable, relative to the pump body. Furthermore, the electric pump comprises, for example, an electric motor which can be operated by means of electrical energy or an electrical current. The electric machine is operated in such a way that the electric motor can drive the conveying element, thereby moving it relative to the pump body, thereby conveying or being able to convey the medium by means of the conveying element.

[0008] In order to now achieve a very efficient drive operation, the drive has a parking lock which is provided in addition to the shift element, in particular. The parking lock has the function which has been known for a long time that the motor vehicle can be fixed by means of the parking lock in order to prevent an undesired roll-off, in particular when the motor vehicle is parked on a slope or a ramp. The motor vehicle has, for example, at least two wheels, also referred to as road wheels, which can be driven electrically by means of an electric machine in order to thereby drive the motor vehicle electrically. Here, the road wheels are ground contact elements by means of which the motor vehicle can be supported or supported on the ground in the vehicle vertical. If the motor vehicle is driven along the ground and the motor vehicle is supported on the ground in the vehicle vertical by means of the ground contact elements, the road wheels roll on the ground. Here, the transmission has, for example, a transmission output shaft by means of which the transmission can provide a drive torque. The drive torque is derived, for example, from a torque provided by the electric machine in order to drive the motor vehicle. The parking lock can now be switched, for example, between a locked state and an unlocked state. In the locked state, the transmission output shaft is fixed by means of the parking lock against a rotation relative to the transmission housing, whereby, in particular, the road wheels which are connected to the transmission output shaft for a continuous torque transmission are fixed against a rotation relative to the transmission housing. Thereby, the motor vehicle can be fixed in order to prevent an undesired roll-off. In the unlocked state, the parking lock releases the transmission output shaft and the wheels in order to allow a corresponding rotation relative to the transmission housing, so that the transmission output shaft and thereby the motor vehicle can be driven by the electric machine in the unlocked state. Thereby, the transmission output shaft is rotated relative to the housing. In particular in the locked state, the transmission output shaft is fixed by means of the parking lock in a form-fitting manner against a rotation relative to the housing.

[0009] In addition, the circuit has a third branch which can be flowed through by the medium in order to actuate the parking lock. This means that the medium can be conveyed by means of the pump through the circuit and thereby also through the third branch. By conveying the medium through the third branch, the parking lock is supplied with the medium and thereby actuated by means of the medium, wherein by actuating the parking lock it can be switched from the locked state into the unlocked state and / or from the unlocked state into the locked state. It is therefore provided according to the invention that at least three functions are implemented by means of one pump and by means of one circuit. A first function is the cooling and / or lubrication of the electric machine and / or the transmission by means of the first branch, in that the first branch is supplied with the medium by means of the pump or the medium is conveyed through the first branch by means of the pump. A second function is the actuation of the shift element, in that the second branch is supplied with the medium by means of the pump or the medium is conveyed through the second branch by means of the pump. A third function is the actuation of the parking lock, in that the third branch is supplied with the medium by means of the pump or the medium is conveyed through the third branch by means of the pump.

[0010] The shift element is switchable, for example, between an engaged state and a disengaged state. The shift element, for example, a switching portion thereof, is movable, in particular translationally and / or relative to the housing, between an engaged position, which results in the engaged state, and a disengaged position, which results in the disengaged state, in particular by actuating the shift element. In the engaged state, at least two components of the transmission, for example, are connected to one another rotationally, in particular in a form-fit manner, by means of the shift element, so that the components connected to one another rotationally by means of the shift element rotate together or simultaneously at the same angular velocity about a common axis of rotation relative to the housing, in particular when the transmission is driven by means of the electric machine. In the disengaged state, the shift element releases the components to allow a rotation of the components relative to one another about the axis of rotation, so that the components rotate or can rotate relative to one another in the disengaged state, in particular when the transmission is driven. The shift element is preferably designed as a self-sustaining shift element, which is held independently or automatically in the disengaged state and / or in the engaged state. It is also preferred that the parking lock is designed as a self-sustaining parking lock, which is held independently or automatically in the locked state and / or in the unlocked state. The invention is based, in particular, on the recognition that, in order to actuate the shift element, in order to actuate the parking lock and in order to cool and / or lubricate the electric machine and / or the transmission, there are similar or identical requirements with regard to the medium delivery, so that the requirements can be met by means of the same pump. With regard to the cooling and / or lubrication of the electric machine and / or the transmission, the pump delivers a medium and thus causes a volume flow or mass flow of the medium, which is used to cool and / or lubricate the electric machine and the transmission. The volume flow or mass flow is therefore also referred to as a cooling volume flow and / or a lubrication volume flow or also as a cooling mass flow and / or a lubrication mass flow. Here, a high volume flow at a low pressure level of, for example, 5 bar is advantageous with regard to actuating the shift element, actuating the parking lock and cooling and / or lubricating the transmission and / or the electric machine. Such a high volume flow at a low pressure level can be provided by the pump or can be achieved by means of the pump. In other words, the pump can provide a high volume flow of the medium at a low pressure level and deliver it through the branch, so that the cooling and / or lubrication of the electric machine and / or the transmission, the actuation of the shift element and the actuation of the parking lock can be realized in a manner that is advantageous in terms of the fewest possible parts and, in turn, in terms of construction space, weight and costs. In addition, with regard to the design of the sealing surfaces, only low sealing requirements are sufficient, for example with regard to the mounting of the pump in the housing, so that the three aforementioned functions can be exhibited in a very simple and low-cost manner. In addition, an additional separate pressure regulating slide for adjusting or regulating the pressure in the circuit, also referred to as the hydraulic circuit, can be dispensed with compared to common solutions, so that the number of parts and, in turn, the weight, the costs and the construction space requirement can be kept within a very small range. Furthermore, a low drive technology complexity can be maintained and a very high robustness and a very energy-efficient operation can be exhibited.

[0011] In a particularly advantageous embodiment of the application, the drive device comprises a valve element, by means of which, inter alia, the first branch and the second branch can be selectively supplied with the medium delivered by the pump. The valve element is switchable between a cooling state and an actuating state. The cooling state is a first switching state or a first switching state of the valve element, and the actuating state is a second switching state or a second switching state of the valve element. The valve element is preferably designed as an electrically switchable valve element, so that the valve element can preferably be switched from at least one of the switching states to the other switching state and / or from the other switching state to one of the switching states, so that the valve element is supplied with electrical energy or an electrical current. In the cooling state, the first branch is fluidically connected to the pump by means of the valve element and can thus be supplied with the medium delivered by the pump by means of the valve element, and the second branch is fluidically separated from the pump by means of the valve element. If, for example, the valve element is in the cooling state and at the same time the medium is delivered by means of the pump, the medium is delivered by means of the valve element into the first branch and through the first branch, so that in the cooling state the electric machine and / or the transmission are supplied with the medium and thus cooled and / or lubricated by means of the medium. However, the second branch and thus the shift element are inhibited from being supplied with the medium delivered by the pump, so that, inter alia, an actuation of the shift element does not take place. In the actuating state, however, the second branch is fluidically connected to the pump by means of the valve element, so that the second branch and thus the shift element can be supplied with the medium delivered by the pump by means of the valve element, and the first branch is fluidically separated from the pump by means of the valve element. In order to switch, for example, the shift element, the valve element is switched to the actuating state. If the medium is then delivered by means of the pump, the medium is delivered by means of the pump to the second branch and thus, inter alia, to the shift element by means of the valve element, so that the shift element is actuated. However, the delivery of the medium through the first branch by means of the pump does not take place. It is thus possible very simply to supply the shift element (second branch) and the first branch with the medium on demand. The valve element is preferably an electrohydraulic valve element.

[0012] In order to be able to actuate the parking lock in particular simply and with high energy efficiency, it is provided in a further design of the application that the valve element is switched to the actuating state in order to actuate the parking lock. This embodiment is based, inter alia, on the recognition that, during the period in which the parking lock is actuated or can be actuated by means of the medium, the cooling or lubrication, i.e. the delivery of the medium through the first branch by means of the pump, can be simply and without disadvantages deactivated or inhibited. It is thus possible to actuate the parking lock in a very simple and highly energy-efficient manner.

[0013] A further inventive embodiment is characterized in that a second valve element is provided in the second branch, in particular in addition to the valve element. The second valve element is thus arranged downstream of the first valve element and in particular upstream of the shift element in the flow direction of the medium flowing from the first valve element to the shift element. The second valve element can be switched between an engaged state and a disengaged state. The engaged state is also referred to as the first state, or the engaged state is the first state of the second valve element, wherein the disengaged state is the second state or also referred to as the second state of the second valve element. The second valve element is preferably designed as an electrically operated valve element or an electrically operated switching valve element, which can thus be switched from one of the states to the other and / or from the other to one, i.e. the second valve element is supplied or can be supplied with electrical energy or current. The second valve element can thus preferably be an electrically operated hydraulic valve element. In the engaged state, the shift element is in fluid communication with the first valve element via the second valve element, whereby the shift element can be supplied with the medium delivered by the pump via the valve elements, in particular during the first valve element is in the actuated state, whereby the shift element can be actuated to engage. In other words, in order to engage and in particular in order to move the shift element in the first direction and thus from the disengaged position to the engaged position, the second valve element is or will be switched to the engaged state and the first valve element is or will be switched to the actuated state.

[0014] In the disengaged state, the shift element is in fluid communication with the first valve element via the second valve element, whereby the shift element can be supplied with the medium delivered by the pump via the valve elements, in particular during the first valve element is in the actuated state, whereby the shift element can be actuated to disengage. In other words, in order to disengage and in particular in order to move the shift element in the second direction, which is opposite to the first direction, the second valve element is or will be switched to the disengaged state and the first valve element is or will be switched to the actuated state. On the one hand, the actuation of the shift element on demand can thus be realized in a simple and structurally space-saving, weight-saving and cost-saving manner, in order to be able to engage and disengage on demand, thus to engage and disengage. On the other hand, the third branch can be supplied with the medium delivered by the pump on demand by simply switching the valve element. In other words, the actuation of the parking lock on demand can be realized by simply switching the valve element. For example, the first valve element can be supplied with the medium delivered by the pump via a line element. For this purpose, the line element is in fluid communication with the pump on the one hand, in particular at one end, and with the first valve element on the other hand, in particular at the other end. Here, a second line element is preferably provided, which branches off from the first line element in particular at a branch point arranged downstream of the pump and upstream of the first valve element, wherein the parking lock can be supplied with the medium delivered by the pump via the second line element. It can be envisaged in particular that the second line element is part of or forms the third branch, so that for example the third branch branches off from the first line element at the branch point.

[0015] For example, the parking lock can thus be supplied with the medium delivered by the pump in a very simple manner in such a way that the first valve member is in the actuated state and the second valve member is in one of the states, in which, in one of the states of the second valve member, the actuation of the shift element, i.e. the movement of the shift element, is inhibited despite the delivery of the medium by means of the pump. Since the first branch is thus fluidically decoupled from the pump and the shift element is already in a state or position which can be caused by the state of the second valve member, such that the shift element is not actuated or moved in the case of the delivery of the medium by means of the pump, the medium delivered by the pump flows to and into the third branch and thus via the third branch to the parking lock, thereby actuating the parking lock. In other words, in the branch which is fluidically connected to the pump, which can be the third branch and the second branch, a sufficient pressure, also referred to as system pressure, can be built up, by means of which the parking lock can be acted upon in order to actuate it or move it. It can be irrelevant here whether the shift element, which is designed for example as a claw or claw clutch, is in the engaged state or the disengaged state and thus engaged or disengaged. In other words, it can be irrelevant whether the gear of the transmission is engaged or disengaged when the motor vehicle is stationary and the parking lock is in the locked state. However, it is advantageous at this point that the second valve member remains in its access state unchanged during the actuation of the parking lock, the second valve member being in this state before the actuation of the parking lock or before the parking lock is required to be actuated, so that the shift element, for example the switching part designed as a piston, is not moved, although the shift element is fluidically connected to the pump by means of the valve member and the medium is delivered by means of the pump. A sufficient volume flow and a sufficient pressure can thus be built up by means of the pump in order to actuate the parking lock, wherein the medium pressure acts on the shift element and can in particular be built up very quickly, i.e. without movement of the shift element. The background of this embodiment is also that the switching processes of the shift element and the parking lock do not usually take place simultaneously, so that both functions do not require the supply of the medium, for example oil, at the same time. This applies in particular to all three functions. This embodiment also allows the three functions to be implemented without the third locking state of the first valve member, which is technically particularly complex. The drive device can thus be operated on demand and with high energy efficiency in a very simple and low-cost manner.

[0016] A further embodiment is characterized in that the shift element is a positive shift element, in particular a claw or claw clutch. It has been found that the actuation of the positive shift element in particular can be very well combined with the actuation and cooling and / or lubrication of the parking lock, since the three functions have similar or at least substantially identical requirements with regard to the delivery of the medium which can be achieved by means of the pump.

[0017] In order to be able to operate the drive device on demand in a particularly simple and low-cost manner, it is provided in a further embodiment of the application that the pump is operable in a forward operating mode and in a reverse operating mode. Forward operation means, inter alia, that in the valve piece the delivery element is driven by means of the electric motor in such a way that the delivery element is moved in a first movement direction relative to the pump body. Reverse operation means, inter alia, that in the reverse operating mode the delivery element is driven by means of the electric motor in such a way that the delivery element is moved in a second movement direction opposite the first movement direction relative to the pump body. Forward operation is provided for delivering the medium from the pump to the partial branches. Thus, for example, the pump is operated in the forward mode in order to deliver the medium from the pump to the partial branches by means of the pump. In the forward operating mode, the medium delivered by means of the forward operating pump flows from the first port of the pump to the second port of the pump. The first line piece mentioned above, for example, is in fluid connection to the second port.

[0018] The reverse operation is provided for delivering the medium from at least a part of the third partial branch, in particular from at least a part of the second line piece, by means of the pump. In the reverse operating mode, the medium delivered by means of the reverse operating pump, in particular from the third partial branch, more particularly from the second line piece, flows from the second port of the pump to the first port of the pump, whereby the medium can be delivered from at least a part of the third partial branch or is delivered. In particular, it is possible, for example, to advantageously actuate, in particular to disengage, a parking lock by means of the reverse operation. Disengaging the parking lock means that the parking lock is switched from a locked state to an unlocked state. The switching of the parking lock from the unlocked state to the locked state is also referred to as the engagement of the parking lock.

[0019] In order to implement a particularly advantageous drive device operation in a particularly simple and energy-efficient manner, it is provided in a further embodiment of the application that the transmission has at least one second shift element in addition to the shift element. It is also conceivable that the transmission has a second gear in addition to the gear. The second gear is preferably switchable, i.e. can be engaged and disengaged. The second gear can be switched, for example, by actuating the second shift element. Thus, the second gear can be engaged and / or disengaged, for example, by actuating the second shift element.

[0020] In addition, the drive device preferably has a second circuit, which can be flowed through by the medium in order to actuate the second shift element. In other words, in order to actuate the second shift element, the medium is delivered through the second circuit. To this end, the drive device comprises a second electric pump, by means of which the medium can be delivered through the second circuit. The above and below explanations for the first pump can be immediately transferred to the second pump and vice versa.

[0021] It is particularly indicated here that it is advantageous if the second shift element is a frictional shift element, in particular a brake. The second shift element can be a disc clutch or a disc brake, for example.

[0022] This embodiment is based on the recognition that frictional shift elements require a higher medium pressure and a smaller medium volume flow than form-fit shift elements in order to switch, in particular close and / or keep closed, the frictional shift elements by means of the medium. Since the drive device preferably has a first circuit and a second circuit, two actuation functions can be assigned to the circuits. The first actuation function comprises actuating the first shift elements, actuating the parking lock and supplying the first branch with medium in order to thereby lubricate and / or cool the electric machine and / or the transmission. The second actuation function comprises actuating the second shift elements. The first actuation function can be implemented in such a way that a high first medium volume flow with a first low pressure is provided or generated by means of a first pump. The second actuation function can be implemented in such a way that a second medium volume flow with a second pressure, which is higher than the first pressure, but smaller than the first volume flow, is realized or provided by means of a second pump. In addition, it can be implemented that the second pump is only operated or delivers medium through the second circuit by means of the second pump when the second shift elements are switched or engaged or kept closed. Thereby, an energy-efficient operation will be ensured.

[0023] In order to be able to keep the costs, the space requirement and the weight very low in the end and thus to realize a very advantageous drive device operation, it is provided in a further design of the application that the drive device has a tank which is common to the pumps and the circuits, from which tank the medium can be delivered through the circuits by means of the pumps. The tank is thus formed by the medium or the medium can collect in the tank, for example.

[0024] A second aspect of the application relates to a motor vehicle, preferably designed as a car, in particular as a passenger car, comprising a drive device according to the first aspect of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] Further advantages, features and details of the application result from the following description of preferred embodiments and in conjunction with the drawings. The features mentioned in the description and the features combinations mentioned in the description above and the features mentioned in the following description of the drawings and / or shown in the drawings alone can be used not only in the respective combinations indicated, but also in other combinations or alone, without departing from the scope of the application. The drawings show:

[0026] Figure 1 schematic view of a drive device for a motor vehicle according to the application;

[0027] Figure 2 schematic view of a drive device;

[0028] Figure 3 schematic view of a drive device;

[0029] Figure 4 schematic view of a drive device;

[0030] Figure 5Another schematic diagram showing a portion of the drive unit. Detailed Implementation

[0031] In the figure, identical or functionally identical parts are labeled with the same reference numerals.

[0032] Figure 1 A portion of the drive unit 10 of a motor vehicle is shown in the schematic diagram. The motor vehicle is preferably designed as an automobile, especially a sedan. This means that the motor vehicle, in its manufactured state, has a drive unit 10 and can be driven by means of the drive unit 10, especially by pure electric drive. The drive unit 10 has, for example, Figure 1 The motor 12 shown in particular schematically and as shown in the figure Figure 1 The transmission 14, as illustrated in particular, allows the vehicle to be electrically driven, especially purely electrically, by means of an electric motor. The transmission has at least two switchable, disengaged gears, also referred to as gear positions, and distinguished from each other, for example, with respect to their transmission ratios that allow the vehicle to be driven by the electric motor 12. The transmission 14 and consequently the drive unit 10 have a first shift member 16 and an additionally provided second shift member 18. The first gear can be disengaged by actuating the shift member 16. The second gear can be disengaged by actuating the shift member 18. Preferably, when the first gear is engaged, the second gear is disengaged. Preferably, when the second gear is engaged, the first gear is disengaged. Therefore, the first gear can be switched using the shift member 16, and here, the second gear can be switched using the shift member 18.

[0033] The drive unit 10 includes a first circuit 20 through which a liquid medium, preferably designed as oil, can flow. The first circuit 20 includes a first branch 22 through which a medium can flow to cool and / or lubricate the motor 12 and the transmission 14. For this purpose, the branch 22 includes, for example, a first portion branch 24 through which a medium can flow, thereby supplying a medium to the motor 12 for cooling and / or lubrication. Figure 1It can be seen that the partial branch 24 is further split and thus has branches 26a, b, through which the medium can flow. Thus, for example, different partial regions of the electric machine 12 can be supplied with medium by means of the branches 26a, b and thus lubricated and / or cooled by means of the medium. In addition, the partial branch 22 comprises a second partial branch 28, by means of which the transmission 14 can be supplied with medium in order to cool and / or lubricate the transmission 14 by means of the medium by means of the partial branch 28. It can be seen that the partial branch 28 and the partial branch 24 are switched parallel to one another. Here, a cooler 30 for cooling medium is arranged in the partial branch 24. The cooler 30 is assigned a bypass line 32, which is connected to the partial branch 24 at two communication points. A first communication point of these is arranged in the partial branch 24 upstream of the cooler 30, and a second communication point is arranged in the partial branch 24 downstream of the cooler 30 and upstream of the electric machine 12. It is thus possible for at least a portion of the medium flowing through the partial branch 24 to be diverted from the partial branch 24 by means of the bypass line 32 at the first communication point and to be fed into the bypass line 32. The medium fed into the bypass line 32 flows through the bypass line 32 and thus bypasses the cooler 30 and is thus not cooled by means of the cooler 30. Here, a valve element 35, which is preferably designed as a thermostat valve, is preferably arranged in the partial branch 24, by means of which the quantity of medium flowing through the bypass line 32 and thus bypassing the cooler 30 can be adjusted, in particular as a function of the medium temperature.

[0034] In addition, the circuit 20 comprises a second branch 34, through which the medium can flow in order to actuate the shift element 16. This means that the shift element 16 can be supplied with medium by means of the second branch 34 in order to actuate the shift element 16 by means of the medium flowing through the second branch 34. In addition, the drive device 10 has an electric pump 36 assigned to the circuit 20, by means of which the medium can be conveyed through the circuit 20 by means of an operation, in particular an electric operation, of the pump 36. This means that the branches 22 and 34 can be supplied with medium by means of the pump 36. The pump 36 here comprises an electric motor 38 and a conveying element 40, which is arranged, for example, in a pump body of the pump 36. By supplying the electric motor 38 with electrical energy or current, the electric motor 38 is operated in such a way that the electric motor 38 drives the conveying element 40 and thus moves, in particular rotates, relative to the pump body.

[0035] In order to be able to implement a particularly advantageous and in particular energy-efficient drive 10 operation in a particularly advantageous manner with regard to weight, cost and installation space, the drive 10, in particular the transmission 14, comprises a parking lock 42. Here, the circuit 20 has a third branch 44, which can be spatially and / or fluidically separated from the branch 22 and / or the branch 34. Here, in order to actuate the parking lock 42, the branch 44 can be flowed through by the medium. In other words, in order to actuate and thus engage and / or disengage the parking lock 42, the parking lock 42 is supplied with the medium conveyed by the pump 36 via the branch 44. The parking lock 42 can be moved or switched between an engaged state, which is also referred to as a locked state, and a disengaged state, which is also referred to as an unlocked state.

[0036] The electric machine 12 can be operated in a motor manner and thus as an electric motor. The electric machine 12 in motor manner is thus a drive motor, which can provide a drive torque for driving the motor vehicle via its output shaft. The drive torque provided by the drive motor can be transmitted into the transmission 14, for example, by means of a first shaft, not shown, of the input shaft of the transmission, which is also referred to as the transmission input shaft. The transmission 14 also has a second shaft, not shown in the figures, which is an output shaft of the transmission, also referred to as the transmission output shaft. The respective drive torque provided by the drive motor via its output shaft can result in a drive torque, which is provided by the transmission 14 via its output shaft. Here, the respective drive torque provided by the drive motor is converted and thus transformed or converted into a drive torque by means of the engagement of the transmission 14 according to the transmission ratio of the engaged gear. In the engaged state, the parking lock 42 locks the output shaft of the transmission 14 in a form-fit manner in order to prevent a full rotation relative to the housing of the transmission 14, also referred to as the transmission housing, so that, for example, the motor vehicle can be secured against an undesired roll-off when it is parked on a slope. In the disengaged state, however, the parking lock 42 releases the output shaft in order to allow a free rotation, in particular, relative to the transmission housing, so that the output shaft can be rotated freely or in full rotations relative to the transmission housing in the disengaged state. In order to thus drive the motor vehicle by means of the electric machine, the parking lock 42 is in its disengaged state.

[0037] The drive device 10 comprises a first valve member 46, which is arranged, for example, in the circuit 20. By means of the valve member 46, the branches 22 and 34 can be supplied with the medium conveyed by the pump 36. Here, the valve member is switchable between a cooling state and an actuating state. In the engagement state, the first branch 22 is fluidically connected to the pump 36 by means of the valve member 46, so that the first branch can be supplied with the medium conveyed by the pump 36 by means of the valve member 46, but the second branch 34 is fluidically separated from the pump 36 by means of the valve member 46. In order to thus convey the medium by means of the pump 36 through the branch 22, the valve member 46 is switched into the cooling state. Here, the shift element 16 is inhibited from being supplied with the medium conveyed by the pump 36. In the actuating state, the second branch 34 is fluidically connected to the pump 36 by means of the valve member 46, so that in the actuating state the second branch 34 can be supplied with the medium conveyed by the pump 36 by means of the valve member 46, but the first branch 22 is fluidically separated from the pump 36 by means of the valve member 46. In order to thus actuate the shift element 16 and engage the first gear, the valve member 46 is switched into the actuating state. Here, the medium is inhibited from being conveyed by means of the pump 36 through the branch 22. In order to actuate the parking lock 42, the valve member 46 is in the actuating state.

[0038] In addition, the drive device 10 has a second valve member 48, which is arranged in the second branch 34 and which is switchable between an engagement state and a disengagement state. In the engagement state, the shift element 16 is fluidically connected to the first valve member 46 by means of the second valve member 48, so that in the engagement state the shift element 16 can be supplied with the medium conveyed by means of the pump 36 by means of the valve members 46, 48, if the valve member 46 is in the actuating state, so that the shift element 16 is thus actuated or can be actuated, i.e. the first gear is engaged. In the disengagement state, the shift element 16 is fluidically connected to the first valve member 46 by means of the second valve member 48, so that in the disengagement state the shift element 16 is thus supplied or can be supplied with the medium conveyed by the pump 36 by means of the valve members 46, 48, if the first valve member is in the actuating state, so that the shift element 16 is actuated or can be actuated, so that the first gear is disengaged.

[0039] It can be seen from Figure 1 that the shift element 16 has a housing 50, which is designed, for example, as a cylinder, and a piston 52, which is arranged in the housing 50 and which is movable in translation relative to the housing 50, and a piston rod 54, which is connected to the piston 52 and which is thus movable in translation relative to the housing 50 together with the piston 52. The piston 52 and the housing 50 delimit a first working chamber 56 and a second working chamber 58 of the shift element 16. The piston 52 and the piston rod 54 are along a longitudinal axis 60 of the shift element 16. Figure 1The working chamber 56, 58 is in fluid communication with the valve member 48 in the mounted state and is fluidically separated from the valve member 48 in the dismounted state. The working chamber 58 is in fluid communication with the valve member 48 in the mounted state and is fluidically separated from the valve member 48 in the dismounted state. Thus, when the valve member 46 is in the actuated state and the valve member 48 is in the mounted state and the medium is delivered by the pump 36, the medium is delivered by the valve members 46, 48 into the working chamber 58. This causes the piston 52 to move in a direction of movement, which extends parallel to the direction of movement and in which the working chamber 56 is located opposite the working chamber 58. Figure 1 A first direction, indicated by the arrow 62, is moved relative to the housing 50, in particular translationally, in order to mount the first gear. In order to dismount the first gear, the following is provided: When the medium is delivered by the pump 36, the valve member 48 is in its dismounted state and the valve member 46 is in its actuated state. Thus, the medium is delivered by the pump 36 through the valve members 46, 48 into the working chamber 56. As a result, the piston 52 is moved in a direction of movement, which extends parallel to the direction of movement and is opposite the first direction and in which the working chamber 58 is located opposite the working chamber 56. Figure 1 A second direction, indicated by the arrow 64, is moved relative to the housing 50, in particular translationally. The first gear is dismounted thereby. It can be seen that the piston 52 is a shifting portion of the shifting element 16, wherein the shifting portion can be moved in the first direction and in the second direction as required in order to mount and dismount the first gear as required.

[0040] The shifting element 16 is preferably a form-fit shifting element, in particular a claw, which is also referred to as a dog clutch. By actuating the shifting element 16, the shifting element 16 can be switched, for example, between an engaged state and a disengaged state. The shifting element can also be adjusted from the disengaged state into the engaged state, for example, by moving the piston 52 in the first direction. By moving the piston in the second direction, the shifting element is switched, for example, from the engaged state into the disengaged state. The valve members 46, 48 are preferably hydraulic electric valve members and can thus be switched between the actuated state and the de-energized state, or between the mounted state and the dismounted state, in an electric manner.

[0041] In order to convey the medium through the branch 22 by means of the pump 36, for example the first valve member 46 is switched into a cooling state. In order to actuate the shift element 16 by means of the pump 36, the valve member 46 is switched into an actuating state. The engaged state and the disengaged state of the valve member 48 are also referred to as states of the valve member 48. In order to actuate the parking lock 42, for example, within a very short time and thus, for example, to set from the engaged state into the disengaged state and / or from the disengaged state into the engaged state, for example the valve member 46 is switched into the actuating state and the valve member 48 is switched into a state which results in that the movement of the piston 52 or the actuation of the shift element 16 resulting therefrom is prevented when the valve member 46 is in the actuating state and the medium is conveyed by means of the pump 36. Thus, if the first gear is disengaged when the actuation of the parking lock 42 should take place, for example, the valve member 48 is switched into its disengaged state. But if the first gear is engaged when the actuation of the parking lock 42 should take place, for example, the valve member 48 is switched into its engaged state. It is thus possible to build up a medium pressure within a short time when the medium is conveyed by means of the pump 36, which pressure can be exerted on the piston 52, for example, by means of the valve members 46, 48, so that the parking lock 42 can be actuated by means of the pressure without the piston 52 having to move beforehand over a too great distance and at the same time, in particular, to one of its final positions. It can be seen that a third valve member 66, also referred to as switching slide, is arranged in the branch 44, the function of which will be described in more detail below. In particular, the switching slide is arranged downstream of the pump 36 and upstream of the parking lock 42 in the flow direction of the medium flowing through the branch 44.

[0042] The transmission 14 and thus the drive device 10 also comprises the shift element 18, which is designed here as a frictional shift element and thus, in particular, as a disc clutch. Here, the drive device 10 also has a second circuit 68, which is preferably at least partially separated from the circuit 20 in terms of the fluid and / or the location. Here, in order to actuate the shift element 18, the circuit 68 can be flowed through by the medium, by means of which, here, by actuating the shift element 18, a second gear can be engaged and / or disengaged. In addition, the drive device 10 comprises a second electric pump 70, which is provided in addition to the pump 36, by means of which the medium can be conveyed through the circuit 68. The pump 70 comprises a second electric motor 72 and a second conveying element 74, which is arranged in a second pump body of the pump 70 and can be moved, in particular rotated, relative to the second pump body. By moving the conveying element 74 relative to the second pump body, the medium is conveyed by means of the conveying element 74. The electric motor 72 is put into operation by supplying the electric motor 72 with electrical energy or electrical current. The operation of the electric motor 72 causes the electric motor 72 to drive the conveying element 74 so that the conveying element 74 is moved, in particular rotated, relative to the second pump body. In the circuit 68, a fourth valve member 76, which is designed as a controllable pressure-limiting valve, for example, is provided, by means of which the shift element 18 can be supplied with the medium conveyed by the pump 70.

[0043] It can be seen that a third valve member 66, also referred to as switching slide, is arranged in the branch 44, the function of which will be described in more detail below. In particular, the switching slide is arranged downstream of the pump 36 and upstream of the parking lock 42 in the flow direction of the medium flowing through the branch 44. Figure 1As seen in the image, the shift member 18 has a housing 78, for example designed as a cylinder, and a piston 80, the piston being particularly movably housed within the housing 78. The piston 80 can move along... Figure 1 The piston movement direction, indicated by the double arrow 82, is a translational movement relative to the housing 78. Additionally, the shift member 18 has a piston rod 84 connected to the piston 80 and thus movable relative to the housing 78 with the piston 80. Medium can be supplied to the working chamber 86 of the shift member 18 via a valve 76 and a pump 70, wherein the working chamber 86 is defined by the piston 80 and the housing 78. By supplying medium to the working chamber 86, the piston 80 extends parallel to the piston movement direction and... Figure 1 The piston moves relative to the housing 78 in the first actuation direction indicated by arrow 88. This, for example, closes the shift member or disc clutch. By moving the piston 80 relative to the housing 78 in the first actuation direction, the spring 90 of the shift member 18 is tensioned. For example, the spring 90 is supported or can be supported on the piston 80 on one side and on the housing 78 on the other side in the piston movement direction. By tensioning the spring 90, the spring 90 provides a spring force. With the aid of the spring force, the piston 80 can move towards the housing 78. Figure 1 The second actuation direction, indicated by arrow 92, extends parallel to the piston's direction of movement and is opposite to the first actuation direction, relative to housing 78. This, for example, disengages the disc clutch. Engaging the disc clutch, for example, engages the second gear. Engaging the disc clutch, for example, disengages the second gear.

[0044] For hydraulic actuation of the parking lock 42, it includes a hydraulic cylinder 94 comprising a housing 96 and a piston 98, also known as a locking piston. The locking piston is at least partially translatably disposed within and relative to the housing 96. The piston 98 and the housing 96 define an actuation chamber 100, within which a medium, for example, can be introduced via a branch 44 by means of a pump 36, thereby moving the locking piston relative to the housing 96 toward... Figure 1 The parking lock moves in the direction indicated by arrow 102. As a result, the parking lock 42 is hydraulically actuated and thus, for example, disengaged.

[0045] Furthermore, the hydraulic cylinder 94 includes a spring 104, which is mechanical in nature, engaging on one side with the locking piston and on the other side, at least indirectly, with the housing 96 and / or the transmission case. By moving the piston toward the first parking lock direction, the spring 104 is tensioned. Thus, the spring 104 provides a spring force, which is opposite to and in the direction of the first parking lock. Figure 1 The locking piston acts in the second direction indicated by arrow 106. With the help of the spring force provided by spring member 104, the locking piston can translate relative to the housing 96 in the second parking lock direction opposite to the first parking lock direction, thereby engaging the parking lock under spring actuation or spring force actuation.

[0046] The parking lock 42 comprises a locking element 108 which is movable relative to the housing 96 between a locking position and an unlocking position. In particular, the locking element 108 can be pivoted relative to the transmission housing or relative to the housing 96 between the locking position and the unlocking position about a pivot axis. If the parking lock 42 is engaged and the locking element 108 is in the locking position, the locking element 108 is inserted into a first recess 110 of the locking piston, whereby the locking element 108 cooperates with the locking piston in a form-fitting manner. Thereby, the locking piston is fixed by means of the locking element 108 in a form-fitting manner against a movement from an engaged position of the locking piston which results in an engaged state of the parking lock 42 to a disengaged position of the locking piston which results in a disengaged state of the parking lock 42, so that the parking lock 42 is reliably held in the engaged state. Here, the locking piston is translatable relative to the housing 96 between the engaged position and the disengaged position. If the locking piston is, for example, in the disengaged position, i.e. the parking lock 42 is disengaged, and the locking element 108 is in the locking position, the locking element 108 is inserted into a second recess 112 of the locking piston, so that the locking element 108 cooperates with the locking piston in a form-fitting manner. Thereby, the locking piston is held in the disengaged position by means of the locking element 108, in particular against a spring force provided by the spring element 104, and is thus locked in a form-fitting manner against a movement from the disengaged position to the engaged position.

[0047] In order to be able to move the locking piston from the engaged position to the disengaged position or vice versa and thus to be able to adjust the parking lock 42 from the engaged state to the disengaged state or vice versa, the locking element 108 is moved, in particular pivoted, from the locking position into the unlocking position. Thereby, the form-fitting cooperation of the locking element 108 with the locking piston is cancelled, so that the locking piston can be moved, in particular displaced, from the engaged position to the disengaged position or vice versa. By moving, in particular pivoting, the locking element 108 from the locking position into the unlocking position, a mechanical spring element 114 of the parking lock 42 is preferably tensioned, in particular compressed, so that a spring force is provided by this spring element 114 at least in the unlocking position. By means of the spring force provided by the spring element 114, the locking element 108 can be moved from the unlocking position into the locking position and thereby brought into engagement with the respective recess 110 or 112, in particular when the locking piston is in the engaged position or the disengaged position.

[0048] In order to now be able to move the locking element 108 as required, in particular against the spring force provided by the spring element 114, from the locking position into the unlocking position, the parking lock 42 comprises an actuator 116 which is preferably electrically and / or hydraulically operable. In Figure 2In the embodiment shown, the actuator 116 is designed as a stroke magnet. The stroke magnet has a housing and a moving part, which is moved at least partially out of the stroke magnet housing by supplying the stroke magnet with electrical energy. In this way, the locking element 108 is moved, in particular rotated, from the locking position into the unlocking position by means of the moving part. Alternatively or additionally, the parking lock 42 can have a further hydraulic cylinder 118, by means of which the locking element 108 can be moved hydraulically from the locking position into the unlocking position.

[0049] It can be clearly seen from Figure 1 that the shift element 18 is supplied with medium, in particular that medium is delivered into the working chamber 86. For this purpose, the delivery element 74 is moved, in particular rotated, relative to the pump body of the pump 70 by means of the electric motor 72 into a first pump direction, which is indicated by the arrow 120. Furthermore, it can be seen from Figure 2 and Figure 2 that the drive device 10 has a tank 122, which is shared by the pumps 36 and 70 and thus by the circuits 20 and 68, in which the medium is accommodated or can be accommodated. Furthermore, the drive device 10 has a filter 124, which is shared by the pumps 36, 70 and thus by the circuits 20, 68, which is arranged downstream of the tank 122 and upstream of the respective pump 36 or 70 in the flow direction of the medium flowing from the tank 122 to the respective pump 36 or 70. By means of the filter 124, the medium flowing from the tank 122 to the respective pump 36 or 70 is filtered. Here, the filter 124 is also referred to as a double filter. However, the filter 124 has at least or exactly one suction opening per pump 36 or 70, wherein these suction openings are separated from one another. Thus, for example, the pump 70 can take in medium from the tank 122 and deliver it to itself only via a first suction opening of the suction openings. Furthermore, the pump 36 can thus take in medium from the tank 122 and deliver it to itself only via a second suction opening of the suction openings, which is separated from the first suction opening. The function of the circuit 68, among other things, comprises supplying the shift element 18, which is designed as a brake, in particular as a disc brake or friction brake, with medium such that the excess medium is as small as possible. The medium, which is delivered to the valve element 76 by means of the pump 70 and via the valve element 76 to the shift element 18, for example, can accumulate at the tank edge of the valve element 76, whereby, among other things, a desired medium pressure is set, in particular adjusted, in the entire circuit 68. If the brake is switched or engaged, the pump 70, for example, continuously works against a pressure resistance, which is caused, among other things, by the engagement of the brake. The pump 70, for example, has a minimum number of revolutions, whereby an excess amount of medium is produced. The leakage flow, which is compensated by the excess amount, can be used, for example, for cooling the brake disc. Another part of the excess amount, if any, can be discharged to the tank 125. Furthermore, it can be seen in Figure 3 that a reservation for a damper is indicated with 126.

[0050] It can be clearly seen in Figure 3 that the shift element 18 is supplied with medium. It can also be clearly seen fromFigure 3 It is seen that the pump 36 supplies both the shift element 18 and the branch 22 for cooling and / or lubricating the electric machine 12 and the transmission 14 with medium. For this purpose, the pump 36 is operated in a positive operating mode, in which the electric machine 38 drives the delivery element 40 in such a way that the delivery element 40 is directed toward the pump body of the pump 36 in the first delivery element direction Figure 4 The first delivery element direction is indicated by the arrow 127. If the shift element 18 is actuated and thus activated, the supply of the branch 22 with the medium delivered by the pump 36 is interrupted for the duration of the activation of the shift element 18. The actuation principle is explained below. The switching of the valve element 48 into the engaged or disengaged state is dependent on whether the first gear is to be engaged or disengaged. The valve element 48 is first switched into its cooling state. The pump 36, in particular the delivery element 40, is set, for example, to its maximum number of revolutions. By means of the valve element 46, in particular by rapidly switching the valve element 46 from the cooling state into the activation state, the medium volume flow caused or achieved or delivered by the pump 36 is rapidly diverted from the branch 22 around the valve element 46 into the branch 34 and thus to the shift element 18, by which the shift element 18 can be activated or switched particularly quickly.

[0051] The following is explained with reference to Figure 5To illustrate the disengagement of the parking lock 42, the pump 36 is operated in its forward direction, so that the delivery element 40 is moved, in particular rotated, by the electric motor 38 in the first delivery element direction (arrow 127). As described above, the valve element 48 is switched into a state which results in that the movement of the piston 52 caused thereby is inhibited when the pump 36 delivers medium and the valve element 46 is in the active state. Therefore, to disengage the parking lock 42, the valve element 46 is switched into the active state. For example, a stroke magnet is energized, so that the locking piston is unlocked. The pump 36, which is preferably designed as an oil medium, for example, first delivers to the shift element 18 and to the switching slide. Since the piston 52 is not moved and thus the shift element 18 does not receive medium from the pump 36, a pressure builds up, which causes the switching slide to move, in particular from the initial position of the switching slide to its switching position. Thereby, in particular the supply line 128 of the branch 44 is fluidically connected to the active chamber 100 by the switching slide, whereby the locking piston is moved against the spring force provided by the spring element 104 into the disengaged position. Subsequently, the energization of the stroke magnet is switched off or ended, so that the locking piston is locked. It can be seen that the pump 36, in particular its pump body, has a first port Al and a second port A2. Through the port Al, the pump 36 is fluidically or connectable, for example, to the sump 122, so that the pump 36 can draw medium from the sump 122 through its port Al. Through the port A2, the valve element 46 can be supplied with the medium delivered by the pump 36, so that, for example, the port A2 is fluidically or connectable to the valve element 46. To this end, a first line element 130 is provided, which is fluidically connected, for example, on one side, in particular at one end, to the port A2 and on the other side or at the other end to the valve element 46. Here, the supply line 128 is a second line element, which is fluidically connected to the first line element 130 at the branch point A. In the flow direction of the medium flowing through the line element 130 and thus from the port A2 to the valve element 46, the branch point A is arranged downstream of the port A2 and thus downstream of the pump 36 and upstream of the valve element 46. It can be seen that the supply line 128 branches off from the line element 130 at the branch point A. It can also be seen that the parking lock 42 or the active chamber 100 can be supplied with the medium delivered by the pump 36 via the supply line 128 in order to disengage the parking lock 42, in particular thereby.

[0052] Finally, the engagement of the parking lock 42 will be illustrated in conjunction with Figure 5 the valve element 46, for example, is switched into the cooling state. The pump 36 is operated in its reverse direction. This means that the electric motor 38 drives the delivery element 40 in such a way that the delivery element 40 is moved in the second delivery element direction (arrow 128) and thus in the direction of the second end of the pump 36. As described above, the valve element 48 is switched into a state which results in that the movement of the piston 52 caused thereby is inhibited when the pump 36 delivers medium and the valve element 46 is in the active state. Therefore, to engage the parking lock 42, the valve element 46 is switched into the active state. For example, a stroke magnet is energized, so that the locking piston is unlocked. The pump 36, which is preferably designed as an oil medium, for example, first delivers to the shift element 18 and to the switching slide. Since the piston 52 is not moved and thus the shift element 18 does not receive medium from the pump 36, a pressure builds up, which causes the switching slide to move, in particular from the initial position of the switching slide to its switching position. Thereby, in particular the supply line 128 of the branch 44 is fluidically connected to the active chamber 100 by the switching slide, whereby the locking piston is moved against the spring force provided by the spring element 104 into the engaged position. Subsequently, the energization of the stroke magnet is switched off or ended, so that the locking piston is locked. It can be seen that the pump 36, in particular its pump body, has a first port Al and a second port A2. Through the port Al, the pump 36 is fluidically or connectable, for example, to the sump 122, so that the pump 36 can draw medium from the sump 122 through its port Al. Through the port A2, the valve element 46 can be supplied with the medium delivered by the pump 36, so that, for example, the port A2 is fluidically or connectable to the valve element 46. To this end, a first line element 130 is provided, which is fluidically connected, for example, on one side, in particular at one end, to the port A2 and on the other side or at the other end to the valve element 46. Here, the supply line 128 is a second line element, which is fluidically connected to the first line element 130 at the branch point A. In the flow direction of the medium flowing through the line element 130 and thus from the port A2 to the valve element 46, the branch point A is arranged downstream of the port A2 and thus downstream of the pump 36 and upstream of the valve element 46. It can be seen that the supply line 128 branches off from the line element 130 at the branch point A. It can also be seen that the parking lock 42 or the active chamber 100 can be supplied with the medium delivered by the pump 36 via the supply line 128 in order to disengage the parking lock 42, in particular thereby. ​The second conveying direction, indicated by arrow 132, opposite to the first conveying direction, is moved relative to the pump body of the pump 36, in particular rotated. In the forward operation, the medium conveyed by the pump 36 operated in the forward direction flows from the port Al to the port A2, whereas in the reverse operation, the medium conveyed by the pump 36 operated in the reverse direction flows from the port A2 to the port Al. By the reverse operation, the medium is conveyed out of the parking lock 42, in particular out of the actuation chamber 100, by the pump 36, or sucked or drawn off. The switching slide, also referred to as slide, which has already caused the movement of the switching slide from the initial position to the switching position by the switching pressure, which is applied to the switching slide when the parking lock 42 is disengaged, moves into the initial position, also referred to as base position, in particular by means of the spring force provided by the spring element 134. By moving the switching slide from the initial position to the switching position, in particular the mechanical spring element 134 is tensioned, whereby the spring element 134 provides the spring force, by means of which the switching slide is returned from the switching position to the initial position. In the initial position, the actuation chamber 100, also referred to as piston chamber, is fluidically connected to the sump 136 by the switching slide, so that the medium previously contained in the actuation chamber 100 can flow into the sump 136 and thus out of the actuation chamber 100 by the switching slide. As a result, the locking piston is moved, in particular displaced, from the disengaged position to the engaged position by means of the in particular mechanical spring element 104, whereby the parking lock 42 is engaged. It is apparent that the travel magnet is first energized or actuated in order to thereby allow the movement of the locking piston from the disengaged position to the engaged position to be caused or caused by the spring force of the spring element 104. If the locking piston has reached its engaged position, the energization of the travel magnet is ended or switched off, whereby the locking piston is again locked. The engagement of the parking lock 42 is preferably redundant, since the locking element 108 can be actuated by means of the actuator 116 and thus electrically and by means of the hydraulic cylinder 118 and thus hydraulically.

[0053] List of reference signs

[0054] 10 drive device

[0055] 12 electric machine

[0056] 14 transmission

[0057] 16 shift element

[0058] 18 shift element

[0059] 20 circuit

[0060] 22 branch

[0061] 24 partial branch

[0062] 26a, b leg

[0063] 28 partial branch

[0064] 30 cooler

[0065] 32 bypass line

[0066] 34 branch

[0067] 35 valve

[0068] 36 pump

[0069] 38 motor

[0070] 40 delivery member

[0071] 42 park lock

[0072] 44 branch

[0073] 46 valve

[0074] 48 valve

[0075] 50 housing

[0076] 52 piston

[0077] 54 piston rod

[0078] 56 working chamber

[0079] 58 working chamber

[0080] 60 double arrow

[0081] 62 arrow

[0082] 64 arrow

[0083] 66 valve

[0084] 68 circuit

[0085] 70 pump

[0086] 72 motor

[0087] 74 delivery member

[0088] 76 valve

[0089] 78 housing

[0090] 80 piston

[0091] 82 double arrow

[0092] 84 piston rod

[0093] 86 working chamber

[0094] 88 arrow

[0095] 90 spring member

[0096] 92 arrow

[0097] 94 hydraulic cylinder

[0098] 96 housing

[0099] 98 piston

[0100] 100 actuating chamber

[0101] 102 arrow

[0102] 104 spring element

[0103] 106 arrow

[0104] 108 locking element

[0105] 110 recess

[0106] 112 recess

[0107] 114 spring element

[0108] 116 actuating mechanism

[0109] 118 hydraulic cylinder

[0110] 120 arrow

[0111] 122 tank

[0112] 124 filter

[0113] 125 tank

[0114] 126 reserved position

[0115] 127 arrow

[0116] 128 supply line

[0117] 130 line element

[0118] 132 arrow

[0119] 134 spring element

[0120] 136 tank

[0121] A branch point

[0122] A1, A2 port

Claims

1. Drive arrangement (10) for a motor vehicle, having: - at least one electric machine (12); - a transmission (14) by means of which the electric machine (12) can electrically drive the motor vehicle; - at least one shift element (16) by means of which at least one gear of the transmission (14) can be shifted by actuating the shift element (16); - a first circuit (20) which can be flowed through by a medium and which has a first branch (22) which can be flowed through by the medium in order to cool and / or lubricate the electric machine (12) and / or the transmission (14) and a second branch (34) which can be flowed through by the medium in order to actuate the shift element (16); and - at least one first electric pump (36) for conveying the medium through the first circuit (20), characterized in that - a parking lock (42) is provided, wherein the first circuit has a third branch (44) which can be flowed through by the medium in order to actuate the parking lock (42), - with respect to the first electric pump (36) - the first electric pump (36) can be operated in a forward direction in order to convey the medium from the first electric pump (36) to the individual branches (22, 34, 44), in the forward direction, the medium conveyed by the first electric pump (36) in forward operation flows from a first port (Al) of the first electric pump (36) to a second port (A2) of the first electric pump (36), and - the first electric pump (36) can be operated in a reverse direction, in the reverse direction, the medium conveyed by the first electric pump (36) in reverse operation flows from the second port (A2) to the first port (Al), whereby the medium can be at least partially fed out of the third branch (44). - a first valve element (46) by means of which the first branch (22) and the second branch (34) can be supplied with the medium conveyed by the first electric pump (36), wherein the first valve element (46) can be switched between: - a cooling state, in which the first branch (22) is in fluid communication with the first electric pump (36) by means of the first valve element (46) and can thereby be supplied with the medium conveyed by the first electric pump (36) by means of the first valve element (46), and the second branch (34) is fluidically decoupled from the first electric pump (36) by means of the first valve element (46); and - an actuating state, in which the second branch (34) is in fluid communication with the first electric pump (36) by means of the first valve element (46) and can thereby be supplied with the medium conveyed by the first electric pump (36) by means of the first valve element (46), and the first branch (22) is fluidically decoupled from the first electric pump (36) by means of the first valve element (46). In order to actuate the parking lock (42), the first valve element (46) is switched into the actuating state. - a second valve element (48) which is arranged in the second branch (34) and which can be switched between: - a first state, in which the second valve element (48) fluidically decouples the second branch (34) from the first electric pump (36) and fluidically couples the second branch (34) to the first branch (22); and - a second state, in which the second valve element (48) fluidically couples the second branch (34) to the first electric pump (36) and fluidically decouples the second branch (34) from the first branch (22). ​ ​ ​ ​ ​ ​ ​ 2. The drive device (10) according to claim 1, characterized in that ​ ​ ​ 3. The drive device (10) according to claim 2, characterized in that ​ 4. The drive device (10) according to claim 2, characterized in that ​ - engaged state, in which the shift element (16) is in fluid communication with the first valve element (46) via the second valve element (48) and can be supplied with the medium delivered by the first electric pump (36) via the first valve element (46) and the second valve element (48), whereby the shift element (16) can be actuated to engage; and - disengaged state, in which the shift element (16) is in fluid communication with the first valve element (46) via the second valve element (48) and can be supplied with the medium delivered by the first electric pump (36) via the first valve element (46) and the second valve element (48), whereby the shift element (16) can be actuated to disengage.

5. The drive device (10) according to claim 3, characterized in that There is provided a second valve element (48) arranged in the second branch (34), which second valve element can be switched between: - engaged state, in which the shift element (16) is in fluid communication with the first valve element (46) via the second valve element (48) and can be supplied with the medium delivered by the first electric pump (36) via the first valve element (46) and the second valve element (48), whereby the shift element (16) can be actuated to engage; and - disengaged state, in which the shift element (16) is in fluid communication with the first valve element (46) via the second valve element (48) and can be supplied with the medium delivered by the first electric pump (36) via the first valve element (46) and the second valve element (48), whereby the shift element (16) can be actuated to disengage.

6. Drive device (10) according to one of the preceding claims 1 to 5, characterized in that The shift element (16) is a form-fit shift element.

7. Drive device (10) according to one of the preceding claims 1 to 5, characterized in that - the transmission (14) has at least one second shift element (18) arranged in addition to the shift element (16); - the drive device (10) has a second circuit (68) through which the medium can flow in order to actuate the second shift element (18); and - the drive device (10) has a second electric pump (70) for delivering the medium through the second circuit (68).

8. The drive device (10) according to claim 7, characterized in that The second shift element (18) is a frictional shift element.

9. The drive device (10) according to claim 7, characterized in that There is provided a tank (122) which is common to the first electric pump (36), the second electric pump (70) and the first circuit (20), the second circuit (68), from which tank the medium can be delivered through the first circuit (20), the second circuit (68) by means of the first electric pump (36), the second electric pump (70).

10. The drive device (10) according to claim 8, characterized in that There is provided a tank (122) which is common to the first electric pump (36), the second electric pump (70) and the first circuit (20), the second circuit (68), from which tank the medium can be delivered through the first circuit (20), the second circuit (68) by means of the first electric pump (36), the second electric pump (70).

11. Motor vehicle having a drive device (10) according to one of the preceding claims 1 to 10.

Images