Drive unit for a parking brake

Abstract

Drive unit (100) for controlling a parking lock (200) comprising: - a transmission (102) which is designed to transmit and / or translate a torque, - an electric motor (104) for generating the torque, - a metallic positioning element (106), wherein the gear (102) and / or the electric motor (104) are connected to the metallic positioning element (106), and - a plastic housing (114), wherein the drive unit (100) is encapsulated by the plastic housing (114), and the gear (102) and / or the electric motor (104) are oriented in the plastic housing (114) by means of the metallic positioning element (106), wherein the electric motor (104) has a first power transmission element (108), wherein the transmission (102) has a second power transmission element (110), and wherein the electric motor (104) and the transmission (102) are arranged on the metallic positioning element (106) such that the first force transmission element (108) and the second force transmission element (110) are in contact with each other, and wherein at least a part of the electric motor (104) and / or the transmission (102) is manufactured in one piece with at least a part of the metallic positioning element (106), wherein the first power transmission element (108) is a first gear, wherein the second power transmission element (110) is a second gear, wherein the two gears are spaced apart by the metallic positioning element (106) such that the first gear and the second gear mesh with each other, wherein a gear ratio between a speed of the transmission (102) and a speed of the electric motor (104) is between 1.1 and 10.

Description

[0001] The invention relates to a drive unit for controlling a parking lock and a method for producing a drive unit and a parking lock.

[0002] Electric parking locks are installed in a wide variety of vehicles today. The electric parking lock is specifically adapted to the specific characteristics of the respective vehicle type. This creates a multitude of options for positioning and contacting the drive unit of an electric parking brake. In conventional electric parking brakes, connection points are introduced into the plastic housing of the parking brake using a multi-component injection molding process. However, the positioning of the connection points, for example, inserts in an injection mold for a multi-component injection molding process, is subject to tolerances, so that the multi-component injection molding process must be adapted to the necessary tolerances for the electric parking brake, which is particularly costly.Alternatively, shafts can be mounted directly into the plastic housing, which also involve tolerances and can damage the plastic housing if overloaded. Furthermore, the simultaneous mounting of the electric parking brake drive elements in the plastic housing and its cover creates bearing tolerances, so the alignment and positioning of the electric parking brake drive elements relative to each other requires additional effort.

[0003] DE 44 44 136 A1 discloses a wired actuating device for remotely controlled actuating movements in a motor vehicle. The actuating device consists of a housing and an electric motor arranged therein with a downstream gearbox, as well as a control unit for the electric motor and a connection for the power supply and control lines. To achieve high functional reliability with simple assembly and minimal inventory, the control unit and the connection for the power supply and control lines are cast into a single component with a casting compound. The component acts as a cover and closes a housing shell in which the gearbox is located.

[0004] An electrically driven brake actuator is known from DE 10 2006 007 755 A1. The brake actuator comprises an electric motor for generating torque, a torque transmission device, and a torque output element. The torque is transmitted from the electric motor to the torque output element by means of at least one vibration-damping element.

[0005] WO 2004 / 044445 A2 discloses an electrically operated parking brake system and an actuator therefor. The actuator comprises a motor with a drive shaft and a transmission coupled to the drive shaft, the transmission providing at least one mechanical output of the actuator.

[0006] DE 40 25 505 A1 discloses a gearbox housing with multiple bearings for shafts. The gearbox housing is made of injection-molded plastic and at least partially comprises outer bearing rings, which are held at the center distance by at least one precision metal insert embedded in the injection-molded plastic housing.

[0007] DE 10 2016 209 783 A1 discloses a modular parking brake actuator for an electric drum brake system. A motor axis including a helical gear pinion and an axis of a spindle assembly including a helical gear coupled to the drive nut are arranged approximately at right angles to each other and define a single gear stage of the parking brake actuator.

[0008] DE 10 2016 216 717 A1 discloses a geared motor drive for an electromechanically actuated motor vehicle brake. The geared motor drive comprises a drive module containing an electric motor and a multi-stage transmission in a transmission housing. A bearing bracket is separately integrated into the transmission housing, which, as a core piece, incorporates the centering mounts for the electric motor, transmission shaft, and / or output gear, so that the external interfaces, for example, electrical and mechanical, of the transmission housing can be varied independently of the bearing device.

[0009] A motor-gearbox combination of a roller blind system is known from DE 102011 007 298 A1.

[0010] With the embodiments described below, an improved drive unit can be provided in an advantageous manner.

[0011] One aspect relates to a drive unit for controlling a parking lock, which drive unit has a transmission configured to transmit and / or translate a torque. The drive unit also has an electric motor for generating the torque. Furthermore, the drive unit has a metallic positioning element, with the transmission and / or the electric motor being connected to the metallic positioning element. Finally, the drive unit has a plastic housing, with the drive unit being encapsulated by the plastic housing and the transmission and / or the electric motor being oriented in the plastic housing by means of the metallic positioning element. Furthermore, the electric motor has a first power transmission element, with the transmission having a second power transmission element.The electric motor and the transmission are arranged on the metallic positioning element such that the first power transmission element and the second power transmission element are in contact with each other. At least a part of the electric motor and / or the transmission is manufactured in one piece with at least a part of the metallic positioning element. The first power transmission element is a first gear, and the second power transmission element is a second gear, wherein the two gears are spaced apart by the metallic positioning element such that the first and second gears mesh. A gear ratio between a speed of the transmission and a speed of the electric motor is between 1.1 and 10.

[0012] The advantage of this embodiment can be that by arranging the electric motor and / or the transmission on the metallic positioning element, the first and second power transmission elements can be arranged with low tolerances. Furthermore, the metallic positioning element can be easily adapted to a variety of electric motors and / or transmissions, so that the design is adaptable to a variety of parking locks. Furthermore, the electric motor, the transmission, and the power transmission elements can be positioned relative to one another using the metallic positioning element without the need for inserts, since the metallic positioning element can be secured to a possible plastic mold. This can have a cost-saving effect, in particular, since complex multi-component injection molds do not need to be produced.In addition, the service life of the drive unit can be improved because the small tolerances between the first and second power transmission element can reduce wear on the first and second power transmission element, since the metallic positioning element is able to position the first to the second power transmission element with low tolerances.

[0013] The transmission can be a gearbox that can absorb torque from an electric motor and transmit it to a parking brake. In particular, the gearbox can change the orientation of the force application or the orientation of the torque and ensure a transmission of the torque from a high speed to a low speed. For example, an electric motor has a first lateral axis, wherein the shaft to which the torque is to be applied is arranged orthogonal to the lateral axis. Furthermore, the drive unit can have a metallic positioning element that is designed to position the electric motor relative to the gearbox and, in particular, to position the first force transmission element and the second force transmission element relative to one another such that they can transmit a force or a torque from the electric motor to the gearbox.In an exemplary embodiment, the metallic positioning element is a stamped and / or milled part that has at least one bore and / or a bearing, to which the gear can be attached to the metallic positioning element by means of a force-fitting, material-fitting, and / or form-fitting connection, and the electric motor can be attached to the metallic positioning element by means of a form-fitting, force-fitting, and / or material-fitting connection. This can be done in particular in . Fig. 1 and is further explained in detail in the corresponding figure description.

[0014] Furthermore, the gearbox and / or the electric motor are connected to the metallic positioning element. For example, the gearbox has a torque input, which forms a shaft that can be positioned parallel to and at a defined distance from the drive shaft of the electric motor by means of the metallic positioning element. This arrangement connects the gearbox to the electric motor via the metallic positioning element. "Connected" can specifically mean that both the gearbox and the electric motor can be secured to the metallic positioning element by means of a screw connection or similar.

[0015] In addition, the electric motor can have a first power transmission element. The power transmission element can be, in particular, a gear or similar element designed to transmit torque to another element. Furthermore, the transmission can have a second power transmission element, which can also be a gear. Alternatively, the first and second power transmission elements can also be formed by a belt or chain drive. The distance between the first and second power transmission elements can be defined by the metallic positioning element, so that the power transmission between the first and second power transmission elements has only minimal play.In addition, the first power transmission element can be arranged on the electric motor, the electric motor being fixed to the metallic positioning element in such a way that the second power transmission element, which is fixed to the gearbox, is in a positive and / or non-positive connection with the first power transmission element, in particular in such a way that the connection between the first and the second power transmission element has a small tolerance. In other words, the gearbox has a gear, the electric motor also has a gear. These two gears can be spaced apart from one another, in particular by the metallic positioning element, in particular with a low tolerance, so that the first and the second gear engage with one another, which can have an advantageous effect on the manufacturing costs of the drive unit. This is shown in . Fig. 1 and is explained in detail in the corresponding figure description.

[0016] According to one embodiment, the metallic positioning element can have at least one bearing, which can be configured to accommodate at least part of the electric motor and / or the gearbox. In other words, the metallic positioning element can have, in particular, a bore and / or a bore provided with a ball, axial and / or radial bearing, in which part, in particular a shaft of an electric motor or a shaft of a gearbox, can be arranged. The bearing can be a ball roller bearing, a rolling bearing, a radial bearing and / or an axial bearing, which can be configured, in particular, to at least partially fix the electric motor to the metallic positioning element. Alternatively or additionally, the metallic positioning element can also have a bearing, in which an axle or a shaft of a gearbox can be arranged. The axle orThe gearbox shaft can be fixed to the metallic positioning element by means of a radial or axial bearing. This can have the particular advantage that the bearing allows the orientation of the shaft of the electric motor and / or gearbox to be clearly defined, thus significantly reducing the tolerance between a first and second power transmission element.

[0017] According to the invention, at least a part of the electric motor and / or the transmission is manufactured in one piece with at least a part of the metallic positioning element. In other words, the metallic positioning element can be directly molded onto the electric motor and / or the transmission, for example, by a casting or joining process. In one exemplary embodiment, the electric motor has a cover, with a recess provided on the cover of the electric motor that assumes the function of the metallic positioning element. In particular, at least one shaft or the like of the transmission can be secured to the metallic positioning element on the metallic positioning element, which is manufactured in one piece with the cover of the electric motor.This can be advantageous because the integral manufacture of the metallic positioning element with the electric motor and / or the gearbox can have a cost-saving effect, in particular reducing the manufacturing costs of the drive unit.

[0018] According to the invention, the drive unit has a plastic housing. The plastic housing can have at least one connecting element, wherein the metallic positioning element can have a connecting surface. Furthermore, the connecting surface can be connected to the connecting element. In other words, the drive unit is encapsulated in a plastic housing, wherein the gear unit and / or the electric motor can be oriented in the plastic housing by means of the metallic positioning element. The metallic positioning element can have a connecting surface, which is designed, for example, as a type of metallic web. Furthermore, the plastic housing can have a connecting element, such as a tab, into which the web of the metallic positioning element can engage, thus establishing a connection between the connecting surface and the connecting element.This connection between the connecting surface and the connecting element can be a plug-in connection, a bayonet lock, a clip connection, or any other form of conventional assembly connection. This can have the particular advantage of eliminating the need for inserts in a multi-component injection molding process, since positioning can be achieved using the metal positioning element with a simple clip or plug connection.

[0019] According to one embodiment, the connecting surface and the connecting element can be connected by means of a force-fitting, form-fitting, and / or material-fitting connection. In other words, the connection between the plastic housing and the metallic positioning element can be established by a clip connection, a hold-down connection, or by means of an ultrasonic welding process. In particular, a force-fitting connection between the connecting surface and the connecting element can offer the advantage that no additional components or assembly steps are required, since the connecting surface is positioned on the connecting element, for example, by holding it down.The advantage of a positive connection can be, in particular, that the connecting surface on the connecting element can be connected by means of a clip connection and thus the metallic positioning element can be detachably connected to the plastic housing and thus the assembly of the metallic positioning element is simplified.

[0020] According to one embodiment, the plastic housing can be designed in at least two parts, comprising a first and a second part. Both the first part and the second part of the plastic housing can have at least one connecting element. Furthermore, the first and second parts of the plastic housing can be connected by means of a force-fitting, form-fitting, and / or material-fitting connection. Furthermore, the first part and the second part of the plastic housing can fix the connecting surfaces of the metallic positioning element with at least one connecting element, in particular by holding them down.In other words, the plastic housing is designed in two parts, with an upper and a lower part. Both the upper and lower parts contain connecting elements into which the connecting surface of the metallic positioning element can engage, thus creating a positive connection between the metallic positioning element and the plastic housing. Alternatively, the connection between the plastic housing and the metallic positioning element can be established by a positive connection, such as a clip or bayonet connection, or by a material connection, which can be achieved, for example, by an ultrasonic welding process.The advantage of this embodiment can be, in particular, that a lower part of the plastic housing is positioned and the metallic positioning element with the gear and the electric motor is mounted in the lower part of the plastic housing. The upper part of the plastic housing can then be slipped over the metallic positioning element and the lower part of the plastic housing. This two-part embodiment can, in particular, have the advantage that the assembly of the metallic positioning element in the plastic housing is significantly simplified, since the metallic positioning element can first be positioned in the plastic housing and then the plastic housing can be closed with the second part. This embodiment is shown in FIG. Fig. 2 and explained in the corresponding figure description.

[0021] According to one embodiment, the plastic housing can have at least one plug, which is and / or can be connected to the electric motor. The plug can be a two-, three-, four-, or six-pin plug, or any other type of plug, which serves in particular to supply power to the electric motor. The plug can be provided as an insert in the plastic housing, or the plug can be formed by the plastic housing. This can have the particular advantage that the manufacturing costs of the drive unit can be significantly reduced by integrating the plug into the plastic housing, thus eliminating an assembly step.

[0022] According to one embodiment, the plastic housing can have an electronic interface, which can be configured to control the electric motor by means of signal transmission. The electronic interface can, in particular, be an interface that can have a CAN, LIN, MOST, FlexRay, or Ethernet contacting option, which can, in particular, be connected to an ECU or ECM. This can be particularly advantageous because the drive unit can be easily controlled via the electronic interface, which can be designed integrally with the plastic housing, thus reducing manufacturing costs and the number of components to be assembled.

[0023] According to the invention, the gear ratio between the speed of the transmission and the speed of the electric motor is between 1.1 and 10. In other words, the electric motor rotates faster or has a higher speed than the output shaft of the transmission. Surprisingly, it was found that the torque transmission efficiency is highest at a gear ratio between 5 and 8 between the transmission and the electric motor, thus resulting in savings in electronic energy required to operate the electric motor.

[0024] A further aspect relates to a method for producing a drive unit as described above and below, comprising the steps: - Establishing a connection between a metallic positioning element and an electric motor, - Contacting the metallic positioning element with a gear, - connecting a first power transmission element to the electric motor, - Establishing a connection between the second power transmission element and the gearbox, and - Establishing contact between the first and second force transmission elements.

[0025] In other words, a connection is established between the metallic positioning element and the electric motor, in particular by a screw connection or a spot weld. Alternatively, a component of the electric motor can also be designed integrally with the metallic positioning element, whereby the connection between the metallic positioning element and the electric motor can already be formed during the manufacturing process of the component of the electric motor.

[0026] In addition, the metallic positioning element can be contacted with the gearbox. This can be done, for example, by means of a screw or plug connection. In addition, the electric motor, in particular a shaft or axle of the electric motor, can be connected to a first power transmission element, for example by form-fitting or using a grub screw. Furthermore, a connection can be established between the second power transmission element and the gearbox, wherein the gearbox has a shaft on which the power transmission element can be arranged and fixed by means of form-fitting or a grub screw. Furthermore, contact can be established between the first and the second power transmission element, in particular by aligning the first to the second power transmission element, such that a form-fitting connection can arise between the two power transmission elements.This can in particular have the advantage that with the aid of the metallic positioning element and the contacting of the electric motor and the gear on the metallic positioning element, the smallest possible tolerance can be achieved between the first and the second force transmission element, in particular because the metallic positioning element is a rigid body which can be manufactured using low-tolerance manufacturing processes.

[0027] According to one embodiment, the method may comprise the step: - Adjusting the metallic positioning element depending on a first parameter for adapting the metallic positioning element to a variety of gears and - Individualizing the metallic positioning element depending on a second parameter to adapt the metallic positioning element to a variety of electric motors.

[0028] In other words, the metallic positioning element can be a parameterized CAD model, wherein the CAD model of the metallic positioning element and the corresponding drawings for the metallic positioning element can be modified depending on various parameters. A first parameter can modify the metallic positioning element such that it can be adapted to a variety of gear types. For example, the first parameter can modify a combination of different bores and / or bearings on the metallic positioning element so that different gear types can be defined at the bores. Furthermore, the method can comprise the step of customizing based on a second parameter, wherein the second parameter ensures that the metallic positioning element can be modified such that it is adapted to a variety of electric motors or electric motor types.This can be achieved, in particular, by inserting various bores and / or holes into the metallic positioning element. The advantage of this embodiment can be that the metallic positioning element can be adapted to a variety of gears and electric motors based on two parameters, thus significantly reducing the design effort, assembly effort, or even the manufacturing effort of the metallic positioning element and thus the drive unit.

[0029] According to the invention, the method further comprises the step: - Connecting the metallic positioning element to a plastic housing.

[0030] The connection between the plastic housing and the metallic positioning element can be achieved, in particular, by a material connection, for example, by means of an ultrasonic welding process, by a positive connection, for example, by a clip, and / or by a force-fitting connection, such as a screw connection. This can have the particular advantage that the metallic positioning element can be secured in the plastic housing in such a way that the electric motor and the transmission, as well as their connection via the power transmission elements, have a small tolerance and are positioned relative to one another, so that no additional assembly aids are required.

[0031] According to one embodiment, the method may comprise the step: - Adjusting the metallic positioning element depending on a third parameter to adapt the metallic positioning element to a variety of plastic housings.

[0032] In other words, the metallic positioning element can be a parameterized CAD model, which can have a third parameter that modifies the metallic positioning element such that it can be adapted to a variety of plastic housings or connection options with plastic housings. This can be particularly advantageous because the drive unit can be easily adapted to a variety of plastic housings, as the positioning between the electric motor and the gearbox does not have to be changed in order to adapt the drive unit to a variety of plastic housings, as this can be done using the third parameter of the metallic positioning element. This can be particularly advantageous because a large variety of electric motors and gearboxes can be used, thus resulting in cost savings.

[0033] According to one embodiment, the method may comprise the step: - Forming the plastic housing in dependence on a fourth parameter for forming at least one plug contact on the plastic housing, wherein the plug contact is designed for mounting the plastic housing in an assembly.

[0034] Alternatively or additionally, the plug contact can be configured to transmit a signal and / or energy to the electric motor. In other words, the plastic housing is also a parameterized CAD model, wherein the plastic housing can be modified depending on a fourth parameter such that a plug contact of the plastic housing is modified depending on the fourth parameter. For example, the type or shape of the plug contact is modified depending on the fourth parameter. The plug contact can be configured depending on an assembly to which the plastic housing can be attached. Furthermore, the plug contact can be configured to transmit a signal and / or energy to the electric motor so that it is supplied with energy and its direction of rotation and its speed can be controlled by means of a signal.This can be particularly advantageous because by changing the plug contact depending on a fourth parameter, the plastic housing can be adapted to a large number of different assemblies that are adjacent to the drive unit, which can lead to a reduction in manufacturing costs.

[0035] Another aspect is a parking lock, which comprises a drive unit as described above and below. A parking lock can, in particular, be an electric parking lock or parking brake.

[0036] Features and elements as described above and below may be features, elements and steps of the method as described above and below, and vice versa.

[0037] A further aspect of the invention relates to a program element which, when executed on a control unit of a manufacturing plant, for example an assembly robot, instructs the assembly robot to carry out steps of the method as described above and below.

[0038] A further aspect of the invention relates to a computer-readable medium on which a program element as described above and below is stored.

[0039] In the following, embodiments of the invention are described with reference to the figures. Fig. 1 shows a schematic view of a drive unit according to an embodiment. Fig. 2 shows a schematic view of a drive unit according to an embodiment. Fig. 3 shows a schematic view of a drive unit according to an embodiment. Fig. 4 shows a flowchart illustrating steps of a method for manufacturing a drive unit according to an embodiment.

[0040] The figures are merely schematic and not to scale. In the figures, identical, equivalent, or similar elements may be provided with the same reference numerals.

[0041] Fig. 1 shows a drive unit 100 of a parking lock 200. The drive unit 100 may have a transmission 102. The Fig. The transmission 102 shown in Figure 1 has a first shaft which includes the first power transmission element 110. The first shaft of the transmission 102 can, in particular, be aligned parallel to a shaft of the electric motor 104. The first power transmission element 108 is fixed to the electric motor 104. The transmission 102 can, as in Fig. 1, can be configured to change the orientation of the torque generated by the electric motor 104 by redirecting the torque by means of the gear box 102. The electric motor 104 is arranged relative to the gear box 102 by means of the metallic positioning element 106. The metallic positioning element 106 has, in particular, at least one bearing 112 on which the electric motor 104 and / or the gear box 102 can be arranged. Furthermore, the metallic positioning element 106 can have a connecting surface 118, wherein the connecting surface 118 is configured to engage a plastic housing 114 of the drive unit 100.

[0042] Fig. 2 shows a schematic representation of the drive unit 100, which has a plastic housing 114, wherein the plastic housing 114 can have a first part 119 and a second part 120. The first part 119 of the plastic housing 114 can be viewed as a type of cover. The second part 120 of the plastic housing 114 can be viewed as a type of lower part of the plastic housing 114. The electric motor 104 with the first power transmission element 108 and the transmission 102 with the second power transmission element 110 can be arranged in the second part 120 of the plastic housing 114 by means of the metallic positioning element 106. The plastic housing 114 can have a connecting element 116 in both the first part 119 and the second part 120, into which connecting element the metallic positioning element can be arranged. This can be achieved in particular by means of a connecting surface 118 on the metallic positioning element 106.In addition, the first part 119 of the plastic housing 114 can have a plug 122, wherein the plug 122 can be configured, in particular, to supply power to the electric motor 104. Both the first part 119 and the second part 120 of the plastic housing 114 can have an electronic interface 124, which can be configured to control the electric motor 104. The plug 122 and the electronic interface 124 can be configured as a single piece.

[0043] Fig. 3 shows a schematic sectional view of the drive unit 100, wherein the electric motor 104 and the gear 102 are arranged by means of the metallic positioning element 106 in the plastic housing 114, in particular in the lower part 120 of the plastic housing 114. As in Fig. 3, the electric motor 104 has a shaft which is arranged parallel to a first shaft of the transmission 102.

[0044] Fig. 4 shows a flowchart illustrating steps of a method for manufacturing a drive unit 100 according to an embodiment. Unless otherwise described, the drive unit 100 has the same elements and features as the drive unit of the Fig. 1 to 3.

[0045] The Fig.The step S1 shown in Figure 4 of establishing a connection between a metallic positioning element and an electric motor positions the metallic positioning element on the electric motor, in particular by means of a screw connection and / or by means of a spot-welded connection. The step S2 of contacting a second metallic positioning element with a gear can, in particular, form a connection between the metallic positioning element and the gear by means of a screw and / or plug connection. The step S3 of connecting a power transmission element to the electric motor can, in particular, describe a connection between a first power transmission element, such as a gear, and the electric motor.Furthermore, in a step for establishing a connection S4 between the second power transmission element and the transmission, a second power transmission element, such as a gear, can be connected to the transmission by means of a positive or non-positive connection, such as a grub screw. Furthermore, in a step for establishing contact S5 between the first and second power transmission elements, the first power transmission element can be aligned with the second power transmission element in such a way that a slight clearance can be set between the two power transmission elements.

[0046] According to one embodiment, the method may further comprise the step S6 of adapting the metallic positioning element depending on a first parameter. The first parameter may adapt the metallic positioning element to a plurality of transmissions, in particular by means of a parameterized CAD model. Furthermore, the method may comprise the step S7 of customizing the metallic positioning element depending on a second parameter, wherein the second parameter may adapt the metallic positioning element to a plurality of electric motors, in particular by means of a parameterized CAD model.

[0047] Furthermore, the method may comprise the step S8 of connecting the metallic positioning element to a plastic housing, wherein the metallic positioning element may be fixed to the plastic housing with a force-fitting, form-fitting and / or material-fitting connection.

[0048] Furthermore, the method may comprise the step S9 of adapting the metallic positioning element as a function of the third parameter, wherein the third parameter adapts the metallic positioning element such that it can be adapted to a plurality of plastic housings.

[0049] Furthermore, the method can comprise the step S10 of forming the plastic housing depending on a fourth parameter, wherein the fourth parameter modifies the plastic housing such that a plug contact can be formed, wherein the plug contact is designed for mounting the plastic housing in an assembly. Furthermore, the plug contact can be configured to transmit a signal or energy to the electric motor.

[0050] Additionally, it should be noted that "comprising" and "having" do not exclude other elements, and the indefinite articles "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features described with reference to one of the above embodiments can also be used in combination with other features of other embodiments described above. Reference signs in the claims are not to be considered as limitations.

Claims

[1] Drive unit (100) for controlling a parking lock (200) comprising: - a gearbox (102) which is designed to transmit and / or translate torque, - an electric motor (104) to generate the torque, - a metallic positioning element (106), wherein the gearbox (102) and / or the electric motor (104) are connected to the metallic positioning element (106), and - a plastic housing (114), wherein the drive unit (100) is encapsulated by the plastic housing (114), and the gearbox (102) and / or the electric motor (104) are oriented in the plastic housing (114) by means of the metallic positioning element (106), wherein the electric motor (104) has a first power transmission element (108), wherein the transmission (102) has a second power transmission element (110), and wherein the electric motor (104) and the gearbox (102) are arranged on the metallic positioning element (106) such that the first power transmission element (108) and the second power transmission element (110) are in contact with each other, and wherein at least a part of the electric motor (104) and / or the gearbox (102) is manufactured integrally with at least a part of the metallic positioning element (106), wherein the first power transmission element (108) is a first gear, wherein the second power transmission element (110) is a second gear, wherein the two gears are spaced apart by the metallic positioning element (106) so that the first gear and the second gear mesh, wherein a transmission ratio between a speed of the gearbox (102) and a speed of the electric motor (104) is between 1.1 and 10. [2] Drive unit according to claim 1, wherein the metallic positioning element (106) has at least one bearing (112) which is configured to accommodate at least a part of the electric motor (104) and / or the gearbox (102). [3] Drive unit according to one of the preceding claims, wherein the plastic housing (114) has at least one connecting element (116), wherein the metallic positioning element (106) has a connecting surface (118), and wherein the connecting surface (118) of the positioning element (106) is connected to the connecting element (116) of the plastic housing (114). [4] Drive unit according to claim 3, wherein the connecting surface (118) and the connecting element (116) are connected by means of a force-fit, form-fit and / or material-fit connection. [5] Drive unit according to one of claims 3-4, wherein the plastic housing (114) is designed in at least two parts with a first part (119) and a second part (120), wherein both the first part (119) and the second part (120) of the plastic housing (114) have at least one connecting element (116), wherein the first part (119) and the second part (120) of the plastic housing (114) are connected by means of a force-fit, form-fit and / or material-fit connection, wherein the first part (119) and the second part (120) of the plastic housing (114) fix the connecting surfaces of the metallic positioning element (106) with at least one connecting element (118), in particular by holding down. [6] Drive unit according to one of the preceding claims, wherein the plastic housing (114) has at least one plug (122) which is connected to and / or connectable to the electric motor (104). [7] Drive unit according to one of the preceding claims, wherein the plastic housing (114) has an electronic interface (124) which is configured to control the electric motor (104) by means of a signal transmission. [8] Method for manufacturing a drive unit according to any one of claims 1-7, comprising the steps: - Establishing a connection (S1) between a metallic positioning element and an electric motor, - Contacting (S2) the metallic positioning element with a gearbox, - Connecting (S3) a first power transmission element to the electric motor, - Establishing a connection (S4) between the second power transmission element and the gearbox, and - Establishing a contact (S5) between the first and second power transmission element, - Connecting (S8) the metallic positioning element to a plastic housing. [9] Method according to claim 8, comprising the step: - Adjusting (S6) the metallic positioning element as a function of a first parameter, for adapting the metallic positioning element to a variety of gearboxes, and - Individualizing (S7) the metallic positioning element depending on a second parameter, for adapting the metallic positioning element to a large number of electric motors. [10] Method according to one of claims 8-9, further comprising the step: - Adjusting (S9) the metallic positioning element depending on a third parameter, to adapt the metallic positioning element to a variety of plastic housings. [11] Method according to any one of claims 8-10, further comprising the step: - Forming (S10) the plastic housing depending on a fourth parameter, to form at least one plug contact on the plastic housing, wherein the plug contact is designed for mounting the plastic housing in an assembly, and / or wherein the plug contact is configured to transmit a signal and / or energy to the electric motor. [12] Parking lock comprising a drive unit according to any one of claims 1-7.

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