Electromechanical drive unit for a bistable contactor

Abstract

The invention relates to an electromechanical drive device (1) for a bistable contactor for driving a movable contact unit (5) of the contactor, comprising: - a piston (3) that can be mechanically connected to the movable contact unit (5), which has an open position in an off state of the contactor and a closed position in an on state of the contactor, - a spring-lever system (6) acting on the piston (3), and - a mechanical actuating unit (7) acting on the spring-lever system (6), which can be driven by an electric motor to change the switching state, wherein the drive unit (1) is designed to provide a spring-assisted locking mechanism for the contactor to maintain the respective switching state and a spring-assisted switching mechanism for the contactor to change the switching state, wherein the spring-lever system (6) is designed to provide the locking mechanism to mechanically lock the piston (3) in the respective position, and wherein the actuating unit (7) is designed to provide the switching mechanism to actuate levers (9, 11, 13) of the spring-lever system (6) under preload of respective springs (10, 12, 14) of the spring-lever system (6) to move the piston (3).

Description

[0001] The invention relates to an electromechanical drive device for a bistable contactor for driving a movable contact unit of the contactor. The invention also relates to a contactor for a high-voltage electrical system of a motor vehicle.

[0002] The focus here is on bistable contactors or bistable high-voltage relays, which can be used particularly in the high-voltage electrical systems of electrified vehicles. Such high-voltage electrical systems typically contain interconnected high-voltage components. These components can include, for example, a high-voltage energy storage system and high-voltage consumers that are powered by the energy storage system. In the event of a fault, such as a vehicle accident, the high-voltage electrical system is generally switched to an intrinsically safe state and de-energized.For this purpose, high-voltage connections of the high-voltage energy storage system can be electrically connected to the high-voltage consumers via contactors, whereby the contactors can have an on state to supply energy to the high-voltage consumers and can be switched off to provide the intrinsically safe state.

[0003] Bistable contactors can maintain their respective switching states without an external power supply. The switching states are therefore stable. Only for switching, i.e., changing between switching states, does the contactor require an external power supply, typically from the vehicle's low-voltage electrical system. Such a contactor is described, for example, in DE 10 2009 002 018 A1. However, bistable contactors have the disadvantage that, due to their stable on-state, they cannot automatically switch to the off-state and thus to a fail-safe state in the event of a low-voltage power supply failure. Furthermore, automotive applications place high demands on contactors regarding switching speeds, arcing, and shock resistance.

[0004] The object of the present invention is to provide a bistable contactor for a high-voltage electrical system of a motor vehicle, which has high switching speeds and low energy consumption and which can be easily transferred into a fail-safe state.

[0005] This problem is solved according to the invention by an electromechanical drive device and a contactor with the features according to the respective independent claims. Advantageous embodiments of the invention are the subject of the dependent claims, the description, and the figures.

[0006] An electromechanical drive unit according to the invention for a bistable contactor serves to drive a movable contact unit of the contactor. The drive unit comprises a piston that can be mechanically connected to the movable contact unit. The piston has an open position when the contactor is off and a closed position when the contactor is on. The drive unit also includes a spring-lever system acting on the piston and a mechanical actuating unit, which acts on the spring-lever system and is electrically driven to change the switching state. The drive unit is designed to provide a spring-assisted locking mechanism for the contactor to maintain the respective switching state and a spring-assisted switching mechanism for the contactor to change the switching state.The spring-lever system is designed to provide the locking mechanism, mechanically locking the piston in its respective position. The actuating unit is designed to provide the switching mechanism, actuating the levers of the spring-lever system under preload from their respective springs to change the piston's position.

[0007] The invention also relates to a bistable contactor for a high-voltage electrical system of a motor vehicle for connecting two high-voltage components of the motor vehicle. The bistable contactor has a stationary contact unit, a movable contact unit, and an electromechanical drive unit according to the invention, wherein the piston is mechanically connected to the movable contact unit. The stationary contact unit and the movable contact unit form a switching device of the contactor. The movable contact unit can, for example, have a switching bridge which, together with the piston, moves linearly between a first position corresponding to the open position of the piston, in which the movable contact unit is arranged at a distance from the stationary contact unit, thereby switching the contactor off or on.is open, and can be moved to a second position corresponding to the closing position of the piston, in which the movable contact unit contacts the stationary contact unit and thereby the contactor is switched on or closed.

[0008] The bistable contactor is a contactor that does not require an energy supply to maintain its current switching state. To hold the switching state, the contactor's drive unit provides the mechanical locking mechanism for the movable contact unit. The contactor only requires an energy supply for switching, i.e., for changing the switching state. For switching, the drive unit provides the switching mechanism for the movable contact unit.

[0009] The drive unit comprises a piston that is rigidly connected to the movable contact unit, for example via a connecting rod. The movable contact unit is thus translationally movable together with the piston. The drive unit can, for example, have a housing in which the piston and the spring-lever system are arranged. A housing wall can have a passage for the connecting rod associated with the piston in order to mechanically connect it to the movable contact unit. Thus, conventional bistable contactors can be easily retrofitted with the drive unit by mechanically connecting the movable contact unit of the conventional contactor to the connecting rod of the drive unit according to the invention.

[0010] The locking and movement of the piston is achieved mechanically via a spring-lever system. To lock the piston, the unpowered actuating unit, which is in its rest position, holds the system in place. To move the piston, the system is electromechanically actuated. For this purpose, the drive unit includes an electric motor, which is only supplied with energy when the contactor switches to drive the actuating unit. The electric motor can be controlled, for example, by a control unit such as a microcontroller in a vehicle. During switching, the electrically driven actuating unit actuates levers of the spring-lever system, which in turn pre-tension the springs of the spring-lever system. These pre-tensioned springs store energy, which is released when the actuating unit returns to its rest position and the springs relax, thus moving the piston.The actuating force provided by the actuator, which moves the lever, is thus converted by the spring-lever system into a restoring force that moves the piston. Due to the spring-assisted switching, the switching speed is therefore not a function of the rotational speed of the electric motor, but rather of the restoring force of the springs. This advantageously allows for high switching speeds, thereby minimizing arcing at the contact units.

[0011] It is advantageous if the electromechanical drive unit includes an emergency power supply unit designed to temporarily power the electric motor in the event of a failure of the standard power supply, thereby switching the contactor into a fail-safe state. The fail-safe state, in this context, refers specifically to the contactor being switched off. The emergency power supply is activated, for example, in the event of a failure of the low-voltage electrical system and is used to enable the contactor to be switched off. The emergency power supply unit can, for instance, consist of a capacitor or a low-voltage battery. The emergency power supply only needs to provide the switching operation, as the off state can be maintained purely mechanically by the interlocking mechanism.For this purpose, the microcontroller can provide positioning, communication and strategy in the event of a failure of the standard power supply.

[0012] In one embodiment of the invention, the spring-lever system comprises an activation lever, spring-mounted by an activation spring, for spring-assisted movement of the piston from the open position to the closed position; a return lever, spring-mounted by a return spring, for spring-assisted movement of the piston from the closed position to the open position; and a locking lever, spring-mounted by a locking spring, for spring-assisted locking of the piston. In particular, the locking spring, designed as a compression spring, is clamped between a housing of the electromechanical drive unit and the locking lever; the activation spring, also designed as a compression spring, is clamped between the piston and the activation lever; and the return spring, designed as a tension spring, is clamped between the piston and the return lever. In the unactuated, spring-relieved state of each lever, the corresponding spring is at least partially relaxed.In the actuated, spring-loaded state of each lever, the corresponding spring is pre-tensioned and thus compressed in the case of a compression spring and extended in the case of a tension spring. In the actuated state of each lever, the restoring force of the corresponding spring acts on the respective lever and / or piston, which moves the respective lever and / or piston when the spring releases.

[0013] In one embodiment of the drive unit, the locking lever for providing the locking mechanism has a blocking position, provided by the at least partially relaxed locking spring and held by the actuating unit in its rest position, for at least indirectly locking the piston in the respective position. Specifically, in the blocking position, the locking lever is positively connected to the piston in the open position when the device is switched on, and positively connected to the activation lever, which holds the piston in the closed position, when the device is switched off. Thus, in the switched-off state, the locking lever locks the piston directly, and in the switched-on state, it does so indirectly via the activation lever.For this purpose, the locking lever can have a first locking area for forming the positive connection with the piston and a second locking area for forming the positive connection with the activation lever.

[0014] To provide the switching mechanism, the driven actuating unit is designed, in a preparatory phase, to actuate at least one lever of the spring-lever system corresponding to the respective switching state change, in order to provide a release position for the locking lever and to pre-tension at least one spring corresponding to the respective switching state change. The actuated spring-lever system is designed, in a switching phase following the preparatory phase, to move the piston by releasing the tension of the at least one pre-tensioned spring.

[0015] To switch the contactor, the locking lever is moved, at least indirectly, from the locked position to an unstable release position by the actuating unit, under preload of the locking spring. To switch on the contactor, the locking lever, which locks the piston in the open position, is temporarily moved to the release position, particularly by the actuating lever operated by the actuating unit. For example, the locking lever has a snap-hook-shaped end section with a chamfered sliding surface for the activation lever and a second locking area designed as an undercut. The activation lever is designed to actuate the locking lever by sliding over the sliding surface. Actuating the activation lever also preloads the activation spring.Once the piston is released by the locking lever, the activation spring relaxes, moving the piston from the open position to the closed position. Here, the piston is mechanically locked by the locking lever blocking the actuated activation lever. For example, the activation lever can be positioned within the undercut of the snap-hook-like end section of the locking lever, creating a snap-fit ​​connection that provides the mechanical locking mechanism.

[0016] To disengage, the locking lever, which secures the piston in the closed position, is temporarily moved to the release position by the actuating unit under tension of the locking spring. Simultaneously, the actuating unit actuates the return lever, thereby tensioning the return spring. As soon as the piston is released by the locking lever, the return spring relaxes, moving the piston from the closed position to the open position. Here, the piston is mechanically locked again by the locking lever, which has returned to its blocking position.

[0017] In a further development of the invention, the actuating unit comprises a rotatable camshaft with a shaft, a cam, and a driver eccentrically arranged on the cam and oriented along the shaft. The cam is designed to actuate the locking lever, and the driver is designed to actuate the activation lever and the return lever. The levers are arranged axially offset from one another, particularly along the camshaft. The shaft runs centrally through the cam. The cam has a partially circular contour with a bulge. The bulge forms a rounded projection of the cam. The cam is designed to actuate the locking lever. For example, the locking lever has a sliding surface for the cam of the actuating unit.In the locked position, the cam rests against the locking lever, away from the projection on the sliding surface, thus exerting a holding force on the locking lever. The locking lever is actuated by the actuating unit, i.e., moved from the locked position to the released position, by the rounded projection sliding over the sliding surface as the camshaft rotates. In addition to the cam, the locking lever can also be actuated by the activation lever.

[0018] The driver is designed to actuate the activation lever and the return lever. The driver can, for example, be a round rod oriented perpendicular to a surface of the cam and parallel to the shaft. The electric motor is specifically designed as a stepper motor and is configured to perform one full rotation of the camshaft, providing a switching cycle for the contactor. A switching cycle comprises moving the contactor from the off state to the on state and back to the off state. The rotational movement of the camshaft provided by the electric motor is converted into the translational movement of the piston via the lever-spring system.

[0019] The embodiments and advantages presented with reference to the drive device according to the invention apply accordingly to the contactor according to the invention.

[0020] Further features of the invention will become apparent from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown in the figures alone, are not only usable in the combinations specified, but also in other combinations or on their own.

[0021] The invention will now be explained in more detail with reference to a preferred embodiment and the drawings. The drawings show: Fig. 1 a schematic representation of a design of a drive device for a contactor in a first view; Fig. 2 a schematic representation of the drive unit in a second view; Fig. 3 a schematic perspective view of subcomponents of the drive unit; and Fig. 4a-4j Illustrations of the drive unit during a switching cycle of the contactor.

[0022] In the figures, identical and functionally equivalent elements are provided with the same reference symbols.

[0023] Fig. 1 and Fig. Figure 2 shows different views of an electromechanical drive unit 1 for a bistable contactor in a sectional view. The bistable contactor can, for example, electrically connect high-voltage components of a high-voltage electrical system in a motor vehicle. The drive unit 1 has a housing 2 in which a piston 3 is arranged. The piston 3 is rigidly connected to a movable contact unit 5 of the contactor via a connecting rod 4. A spring-lever system 6 is also arranged in the housing 2, by means of which the piston 3 can be moved between an open position of the piston 3, in which the movable contact unit 5 is spaced apart from a stationary contact unit of the contactor, and a closed position of the piston 3, in which the movable contact unit 5 makes electrical contact with the stationary contact unit.In the closed position of piston 3, the contactor has an on state that establishes a current-carrying electrical connection between the high-voltage components. In the open position of piston 3, the contactor has an off state that interrupts the electrical connection between the high-voltage components. The spring-lever system 6 can be actuated by an actuating unit 7, which, as shown in . Fig. Figure 3 shows that it can be driven by an electric motor 8, for example a stepper motor that can be controlled by a microcontroller and supplied with electrical energy by a low-voltage electrical system of the motor vehicle.

[0024] The spring-lever system 6 has an activation lever 9, which is connected to the piston 3 via an activation spring 10. The activation spring 10 is a compression spring, which can be compressed by the actuated activation lever 9 to pre-tension the piston. The spring-lever system 6 also has a return lever 11, which is connected to the piston 3 via a return spring 12. The return spring 12 is a tension spring, which can be extended by the actuated return lever 11 to pre-tension the piston. Finally, the spring-lever system 6 has a locking lever 13, which is connected to the housing 2 via a locking spring 14. The locking spring 14 is a compression spring, which can be compressed by the actuated locking lever 13 to pre-tension the piston. The levers 9, 11, 13 are single-sided levers 9, 11, 13 and are rotatably mounted on the housing 2.Actuation of the respective lever 9, 11, 13 means a rotation of the lever 9, 11, 13 around the pivot point or fulcrum located at the housing-side end of the respective lever 9, 11, 13.

[0025] The actuating unit 7 has a camshaft 15 rotatable by the electric motor 8, with a shaft 16, a cam 17, and a driver 18 in the form of a round bar arranged on the cam 17. The levers 9, 11, 13 are arranged axially offset along the shaft 16, so that when the camshaft 15 is rotated, the locking lever 13 is actuated by the cam 17, and the activation lever 9 and the return lever 11 are actuated by the driver 18. The locking lever 13 has a chamfered first sliding surface 19a for the cam 16. The activation lever 9 and the return lever 11 each have sliding surfaces 20, 21 for the driver 18.When the cam 17 slides over the sliding surface 19a of the locking lever 13 and when the driver 18 slides over the sliding surfaces 20, 21 of the activation lever 9 and the return lever 111, the actuating unit 7 exerts a force against the restoring force of the spring 10, 12, 14 belonging to the respective lever 9, 11, 13 on the respective lever 9, 11, 13 and thus actuates it under preload of the respective spring 10, 12, 14.

[0026] Fig. 4a to Fig. Figures 4j show the drive unit 1 during a switching cycle of the contactor, wherein in the Fig. 4a to Fig. 4j the return spring 12 and the locking spring 14 are not shown for the sake of clarity. Fig. Figure 4a shows the drive unit 1 in the off state of the contactor. In the off state, the electric motor 8 is also switched off and therefore receives no power. The actuating unit 7 has a first rest position in which the cam 17 and the partially relaxed locking spring 14 hold the locking lever 13 in a blocking position. In this blocking position, the locking lever 13 mechanically locks the piston 3 in the open position. For this purpose, the locking lever 13 has a first locking area 22, which is designed here as a projection and which forms a positive-locking connection with a corresponding locking area of ​​the piston 3 in the closing direction R1 of the piston 3. The activation lever 9 is unactuated and the activation spring 10 is at least partially relaxed. The return spring 12 is relaxed due to the open position of the piston 3.

[0027] In Fig. Figure 4b shows a preparatory phase during the change of the contactor from the off state to the on state, i.e., when the contactor is switched on. The actuating unit 7 is driven by the electric motor 8, and the camshaft 15 is rotated through a specific angular range. As the camshaft 15 rotates, the driver 18 actuates the activation lever 9 and moves it in the closing direction R1 of the piston 3. When the activation lever 9 is actuated, it slides over a chamfered second sliding surface 19b of the locking lever 13 and, under the preload of the locking spring 14, moves the locking lever 13 from the locked position to a release position. The sliding surfaces 19a, 19b of the locking lever 13 are arranged axially adjacent to each other in the extension direction of the shaft 16, so that the locking lever 13 can be actuated via the cam 17 as well as via the activation lever 9 which is axially offset to the cam 17, depending on the switching phase within the switching cycle.Furthermore, when actuated, the activation lever 9 pre-tensions the activation spring 10.

[0028] Fig. Figure 4c shows a switching phase following the preparation phase when the contactor changes from the off state to the on state. The actuating unit 7 continues to be driven by the electric motor 8, and the camshaft 15 is rotated further by a specific angular range. The switching phase occurs as soon as the locking lever 13 reaches the release position, in which the positive locking connection between the locking lever 13 and the piston 3 is released. The piston 3, together with the activation lever 9, which is further actuated by the driver 18, can then move from the open position in the closing direction R1 to the closed position (here, pressed) by the sudden release of the activation spring 10. At the same time, the activation lever 11 also terminates the actuation of the locking lever 13 by leaving the sliding surface 19a.Thus, by releasing the locking spring 14, the locking lever 13 can return to the blocked position, thereby holding the activation lever 9 in the actuated state. This causes the piston 3 to move, as shown in . Fig. As shown in Figure 4d, the contactor is locked in the closed position. In this locked closed position, the contactor is in the on state. The locking lever 13 has a second locking area 23, which engages the activation lever 9 in a positive-locking connection in the opening direction R2. In the on state, the actuating unit 7 has a second rest position, and the electric motor 8 is switched off again. The locking lever 13 has a snap-hook-shaped area at its end, which forms the sliding surface 19b and the second locking area 23.

[0029] Fig. 4e and Fig. Figures 4f show partial phases of a preparation phase during the change of the contactor from the on state to the off state, i.e., when the contactor is switched off. The actuating unit 7 is driven by the reactivated electric motor 8, and the camshaft 15 is rotated further by a specific angular range. As the camshaft 15 rotates, the driver 18 actuates the return lever 11 and moves it in the opening direction R2 of the piston 3. This pre-tensions the return spring 12 (not shown here), which is attached to the piston 3 when it is blocked in the closed position, via the return lever 11. Fig. 4g and Fig. Figure 4h shows further sub-phases of the preparation phase during the change of the contactor from the on state to the off state. The actuating unit 7 is further driven by the electric motor 8, and the camshaft 15 is rotated further by a specific angular range. During this process, the driver 18 actuates the return lever 11, further stretching the return spring 12, and the cam 17 actuates the locking lever 13 by sliding a projection 17a of the cam 17 over the sliding surface 19a of the locking lever 13, thereby applying a force to the locking lever 13 that opposes the restoring force of the locking spring 14 (not shown here). This moves the locking lever 13 out of the locked position by compressing the locking spring 14, as shown in Figure 4h. Fig. 4h shown, the activation lever 9 and thus the piston 3 free.

[0030] In a Fig. 4i and Fig. In the switching phase shown in 4j, which follows the preparation phase when switching off, the return spring 12, which is pre-tensioned by the return lever 11, can relax again due to the released piston 3, so that the piston 3 is moved, here pulled, from the closed position to the open position by the restoring force of the return spring 12 in the opening direction R2. Fig. Figure 4j shows a fail-safe state of the contactor, in which the contactor is deactivated. The projection 17a of the cam 17 blocks the locking lever 13 from returning to the locking position until the piston 3 has reached its final open position. Then the projection 17a of the cam 17 releases the locking lever 13, allowing it to return to its locked position due to the restoring force of the locking spring 14. Fig. 4a shows the blocking position reversed and mechanically locks the piston 3. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2009 002 018 A1

[0003]

Claims

[1] Electromechanical drive device (1) for a bistable contactor for driving a movable contact unit (5) of the contactor, comprising: - a piston (3) that can be mechanically connected to the movable contact unit (5), which has an open position in an off state of the contactor and a closed position in an on state of the contactor, - a spring-lever system (6) acting on the piston (3), and - a mechanical actuating unit (7) acting on the spring-lever system (6), which can be driven by an electric motor to change the switching state, wherein the drive unit (1) is designed to provide a spring-assisted locking mechanism for the contactor to hold the respective switching state and a spring-assisted switching mechanism for the contactor to change the switching state, wherein the spring-lever system (6) is designed to mechanically lock the piston (3) in the respective position to provide the locking mechanism, and wherein the actuating unit (7) is designed to actuate levers (9, 11, 13) of the spring-lever system (6) under preload of respective springs (10, 12, 14) of the spring-lever system (6) to move the piston (3). [2] Electromechanical drive device (1) according to claim 1, characterized by, that the electromechanical drive device (1) has an emergency power supply unit which, in the event of a failure of a standard power supply of an electric motor (8) driving the actuating unit (7) for changing the switching state, is designed to temporarily supply the electric motor (8) with energy to bring the contactor into a fail-safe state. [3] Electromechanical drive device (1) according to claim 2, characterized by that the emergency power supply unit has a capacitor or a low-voltage battery. [4] Electromechanical drive device (1) according to any one of the preceding claims, characterized by, that the spring-lever system (6) has an activation lever (9) spring-mounted by means of an activation spring (10) for spring-assisted movement of the piston (3) from the open position to the closed position, a return lever (11) spring-mounted by means of a return spring (12) for spring-assisted movement of the piston (3) from the closed position to the open position and a locking lever (13) spring-mounted by means of a locking spring (14) for spring-assisted locking of the piston (3). [5] Electromechanical drive device (1) according to claim 4, characterized by, that the locking spring (14) designed as a compression spring is clamped between the locking lever (13) and a housing (2) of the electromechanical drive unit (1), the activation spring (10) designed as a compression spring is clamped between the pistons (3) and the activation lever (9), and the return spring (12) designed as a tension spring is clamped between the pistons (3) and the return lever (11). [6] Electromechanical drive device (1) according to claim 4 or 5, characterized by , that - to provide the locking mechanism of the locking levers (13) has a blocking position provided by the at least partially relaxed locking spring (14) and held by the actuating unit (7) in a rest position for at least indirectly locking the piston (3) in the respective position, and - to provide the switching mechanism, the electrically driven actuating unit (7) is designed to actuate at least one lever (9, 11, 13) of the spring-lever system (6) corresponding to the change to the respective switching state in a preparation phase to provide a release position of the locking lever (13) and to pre-tension at least one spring (10, 12, 14) corresponding to the change to the respective switching state, and the actuated spring-lever system (6) is designed to move the piston (3) by releasing the at least one pre-tensioned spring (10, 12, 14) in a switching phase following the preparation phase. [7] Electromechanical drive device (1) according to claim 6, characterized by, that the locking lever (13) in the locking position is positively connected to the piston (3) which is in the open position in the switching-on state and in the switching-off state is positively connected to the activation lever (9) which holds the piston (3) in the closed position. [8] Electromechanical drive device (1) according to claim 7, characterized by , that the locking lever (13) has a first locking area (22) for forming the positive locking connection with the piston (3) and a second locking area (23) for forming the positive locking connection with the activation lever (9). [9] Electromechanical drive device (1) according to claim 8, characterized by, that the locking lever (13) has a snap-hook shaped end section which has a chamfered sliding surface (19b) for the activation lever (9) and the second locking area (23) designed as an undercut, wherein the activation lever (9) is designed to actuate the locking lever (13) by sliding over the sliding surface (19b) and to enter into a snap connection with the locking lever (13) by being positioned in the undercut, providing the mechanical locking. [10] Electromechanical drive device (1) according to any one of claims 4 to 9, characterized by, that the actuating unit (7) has a camshaft (15) rotatable by an electric motor (8) of the drive unit (1) with a shaft (16), a cam (17) and a driver (18) arranged eccentrically on the cam (17) and oriented along the shaft (16), wherein the cam (17) is designed to actuate the locking lever (13) and the driver (18) is designed to actuate the activation lever (9) and the return lever (11). [11] Electromechanical drive device (1) according to claim 10, characterized by , that the electric motor (8) is designed as a stepper motor and is designed to perform one full revolution of the camshaft (15) in order to provide a switching cycle of the contactor. [12] Electromechanical drive device (1) according to claim 10 or 11, characterized by , that the locking lever (13) has a sliding surface (19a) for the cam (17) of the actuating unit (7). [13] Contactor for a high-voltage electrical system of a motor vehicle for connecting two high-voltage components of the motor vehicle, comprising: - a stationary contact unit, - a movable contact unit (5), - an electromechanical drive device (1) according to one of the preceding claims, wherein the piston (3) is mechanically rigidly connected to the movable contact unit (5).

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