DE10362213A1 - Actuator assembly in particular for an electromechanical vehicle brake and vehicle brake with such an actuator assembly - Google Patents

Abstract

The invention relates to an actuator assembly (110), in particular for an electromechanical vehicle brake, with a drive (112), a for actuating a friction element (192) movable actuator (184) and a transmission, wherein the transmission with the drive (112) and with the actuator (184) is coupled, further wherein the transmission has a toggle assembly with two arms (126, 168). The invention provides that the drive (112) for activating a parking brake effect in the fixed bearing is pivotally mounted about the pivot axis and that upon pivoting of the drive (112) about the pivot axis, the toggle lever assembly is deflected from the rest position, that they the actuator (184) displaces to actuate the friction element (192).

Description

Background of the invention

The The invention relates to an actuator assembly according to the preamble of claim 1, in particular for an electromechanical vehicle brake, and a suitably equipped Vehicle brake.

In In the past, vehicle brakes were usually designed to that hydraulically operated Cylinder-piston arrangements over a hydraulic circuit directly coupled to a hydraulic pressure source are, which optionally by means of a brake booster on a Brake pedal is controlled. However, such brake systems have the disadvantage that a relatively high Installation and parts cost is required to the hydraulic system to install and reliable to operate. About that In addition, such fully hydraulic vehicle brake systems are relatively maintenance-intensive and error prone, especially because occurring after a certain period of operation Leaks can lead to a failure of the vehicle brake system. Therefore There are efforts to use vehicle brake systems, which no Hydraulic system require more. This is especially useful electrically operated Vehicle brake systems, which in this context also speaks of "brake-by-wire" -Bremsanlagen. In such electrically operated Vehicle brake systems is usually each vehicle wheel is assigned a brake unit which has a disk or drum brake and a brake piston comprises. The brake piston serves as an actuator and pushes a friction element on the brake disc or brake drum. The brake piston can be controlled either hydraulically, pneumatically or electrically become. In any case, the control is determined in terms of operating force, operating stroke, duration of operation etc. according to the type of operation the brake pedal.

State of the art

A purely electromechanically actuated Vehicle brake system and corresponding actuator assembly is for example, from WO 98/01682 known. This state of the art describes an actuator assembly of the type described and a correspondingly formed vehicle brake. The toggle lever arrangement is by means of an electric drive from a rest position deflected and thereby the actuator and ultimately displaces the friction element. About a floating caliper arrangement is achieved that the friction element together with an opposite Frictional element presses on both sides of a brake disc and thus to a braking effect leads. In addition to such over however, it is also a brake pedal initiated braking action required, a parking brake function, it is also called Parking brake function to provide. To achieve this, see WO 98/01682 that in addition to a force on the electric drive, the toggle lever assembly another Point for force introduction provides, at which a parking brake force can be initiated, for example, via a manually operated brake lever is applied. However, this has the consequence that the toggle lever assembly must be designed according to constructive and thus in terms the required installation space, the number of components and the assembly work Disadvantages.

The problem underlying the invention

It is in contrast An object of the present invention is an actuator assembly of the type described at the beginning and one with such an actuator assembly to provide a trained vehicle brake, in which a parking brake function can be realized with less technical effort.

Inventive solution

These Task is accomplished by an actuator assembly with the features of Claim 1 and one equipped with such actuator assembly Vehicle brake released.

Advantageous embodiments and further developments of invention

According to the invention, it can be provided that the actuator assembly has a drive, an actuating element movable for actuating a friction element, and a transmission, wherein the transmission is coupled on the input side to the drive via a force input element and to the actuating element on the output side, wherein the transmission further comprises a toggle lever arrangement with two arms has, of which the first arm via a respective movable bearing with the actuator and with the force input member is pivotally coupled and the second arm to the first arm coupled via a hinge and articulated by means of a pivot axis defining a fixed bearing in a housing, and wherein the Activate the vehicle brake, the force input element linearly displaceable and thereby the toggle lever assembly is such a deflected from a rest position that it displaces the actuator for actuating the friction element. In the actuator assembly according to the invention it is provided that the drive for activating a parking brake in the fixed bearing is pivotally mounted about the pivot axis and that in a Ver pivoting the drive about the pivot axis, the toggle lever assembly is deflected from the rest position, that it displaces the actuator for actuating the friction element.

In a common one Braking operation during the ride is in the actuator assembly according to the invention of Drive is driven in accordance with the force exerted on the brake pedal brake actuation force and moves the force input member therethrough. With the movement of Force input member is the toggle lever assembly out of its rest position moves, so that the actuator and moves with this the friction element. After releasing the brake pedal, i.e. after reducing the braking force to the value zero, moves the toggle lever assembly back to its rest position and the Braking effect is canceled. For example, be the driver Vehicle off, so an activation of the parking brake is required. In this case, a braking effect is not on the drive of the actuator assembly brought about, but by a pivoting of - in this case passive - drive about the pivot axis, which in turn the toggle lever assembly off its rest position is deflected and thereby the actuator and displaces the friction member to achieve a braking effect. If the parking brake should be disabled, then the drive in his original Position swung back around the pivot axis, so that the toggle lever assembly back into their Resting position moves and the braking effect is canceled.

The Pivoting the drive about the pivot axis can either motor or mechanically. A motorized pivoting offers itself For example, then, when the parking brake automatically in certain operating situations of the motor vehicle is activated, e.g. after switching off the engine. For a mechanical pivoting can in a development of the invention, a parking brake mechanism be provided, which without additional on the Vehicle electronics applied energy expenditure by one of the Driver applied actuation force operable and correspondingly solvable is. Therefor can a known parking brake lever mechanically with the Actuator assembly be coupled.

Regarding the configuration of the transmission is in a development of the invention provided that on the first arm, the movable bearing to the actuator and the movable bearing to the force input member in each case in the region of the ends the first arm are arranged and the joint to the second arm between the ends of the first arm, preferably in the middle, is arranged. Furthermore, it can be provided in the embodiment of the transmission, that on the second arm, the joint to the first arm and the fixed bearing are each arranged in the region of one of the ends of the second arm. Arranging the bearings at the ends of the arms results in the maximum arm's length exploited and thus making the best use of available leverage at the same time compact design possible is. To make the transmission even more compact, is provided in a development of the invention that the second Arm shorter as the first arm is formed.

Of the Drive can be designed in various ways. An inexpensive and constructively relatively simple solution let yourself achieve that the drive is designed as a linear drive is. As a linear drive, for example, piezo drives, linear motors or the like. In question. A structurally simple and inexpensive variant of the invention provides that the drive a spindle drive with a drive spindle has, wherein the drive spindle rotatably driven by an electric motor is and pivotally mounted in the fixed bearing about the pivot axis is. In this embodiment of the invention can also be provided be that the force input member as displaceable on the drive spindle Spindle nut is formed. The spindle nut can with a Recirculating ball be designed to minimize friction losses. The use of a spindle drive has the advantage that this cost-effective available, robust and easy to maintain.

Basically The drive can be used to move the toggle assembly out of its position Rest position in a Auslenkstellung and from this Auslenkstellung back to move to their rest position. A development of the invention However, provides biasing means which the toggle lever assembly in their Rest position back pushing. In this embodiment of the invention, the drive is only then used when the toggle lever assembly from its rest position is to be converted into a deflection position. As a biasing agent can For example, spring elements, rubber buffers or the like. Be used.

With regard to the swivel axis defining the fixed bearing, which articulates the second arm in the housing and serves as a pivot point for the drive, in particular for the drive spindle when using a spindle drive, is provided in one embodiment of the invention that the housing is a bearing bore and having a surrounding coaxial annular extension, wherein the bore axis coincides with the pivot axis. To realize the pivotable drive, the invention is provided in this embodiment that the drive is pivotable about at least one pivot lever about the pivot axis, wherein the at least one pivot lever pivotally on the annular extension supports. When using an electric motor for the drive can be provided that the electric motor is accommodated in a motor housing, on which attack the pivot lever.

The Pivoting of the second arm about the pivot axis can at this embodiment the invention be achieved structurally that in the bearing bore a bearing pin is pivotally mounted, on which the second arm pivotally supported. Furthermore, it can be provided in this development of the invention, that for forming a joint connecting the two arms of the first arm at least one journal and the second arm a the Has at least one journal receiving bore. in principle it is sufficient if the individual arms of the toggle lever arrangement as Single struts running are. However, one achieves a higher stability of the toggle lever assembly, if the second arm with two, preferably separated, struts accomplished is, which run on both sides of the first arm. This can be a Tordieren or buckling of the toggle lever assembly can be effectively suppressed what the reliability the actuator assembly according to the invention and a suitably equipped one Vehicle brake further increased.

Regarding the structural design of the individual joints can be provided be that for the training of the actuator with the first Arm coupling bearing the actuator is formed spherically at its area facing the first arm and in a complementary one trained receiving pan engages the first arm and that one Tie rod holds both elements in mutual contact.

Further can be further provided in this context, that for training of the power input member to the first arm coupling floating bearing the force input member at its the first arm facing area spherical is formed and in a complementary trained receiving pan engages the first arm.

One significant advantage of equipped with the actuator assembly according to the invention Vehicle brake is that the pivoting of the actuator assembly (Motor spindle unit) also to a substantial improvement the efficiency of the vehicle brake results because occurring during actuation Transverse or lateral forces compensated become. This pivotability of the actuator assembly is also responsible for the self-release behavior the vehicle brake required. Although the underlying toggle geometry is theoretical free of lateral or lateral forces, so that a pivoting of the actuator assembly is not required would. Indeed occur due to the existing in the camps game at a usual Toggle geometry in practice but transverse or lateral forces.

Brief description of the figures

The Invention will be described below by way of example with reference to the accompanying Figures explained. They show:

1 a schematic representation of the actuator assembly according to the invention with a toggle lever assembly in the rest position;

2 a view accordingly 1 in which, however, the toggle lever arrangement is deflected to achieve a braking effect;

3 a view accordingly 1 in which the drive is pivoted to achieve a parking brake action;

4 an embodiment of an actuator assembly according to the invention in side view;

5 a sectional view of the embodiment according to 4 , cut along the cutting plane V-V out 4 ;

6 a sectional view of the embodiment according to 4 and 5 , cut along the cutting plane VI-VI 4 , and

7 a three-dimensional view of a vehicle brake unit, which with the actuator assembly according to the 4 to 6 Is provided.

Detailed description of embodiments according to the invention

In 1 the actuator assembly according to the invention is shown schematically and generally with 10 designated. 1 shows the actuator assembly 10 in its initial position (rest position), ie it is neither a braking effect initiated by actuation of the brake pedal nor by activating the parking brake. The actuator assembly 10 includes a drive 12 , This is designed with an electric motor 14 , one of the electric motor 14 according to the double arrow P ₁ rotatably driven threaded spindle 16 and one on the threaded spindle 16 arranged, with this threaded threaded spindle nut 18 , The threaded spindle 16 is on a housing 20 about a camp 22 about a pivot axis A pivotally mounted and about its longitudinal axis according to arrow P ₁ rotatably mounted.

The actuator assembly 10 further includes a toggle assembly 24 executed gear. The toggle lever arrangement 24 includes a first arm 26 and a second arm 28 , The first arm 26 is with one end in a joint 30 about an orthogonal to the plane axis pivotally mounted on the spindle nut 18 stored. With its opposite end is the first arm 26 about a floating bearing 32 on a brake piston 34 pivotally mounted about an axis orthogonal to the plane of the drawing. The brake piston 34 is linear in a piston guide 36 guided. About the brake piston 34 can be a in 1 to 3 not shown friction element either directly or indirectly trigger, which then engages in a row in a conventional manner, for example via a floating caliper assembly on a brake disc.

Turning back to the toggle lever assembly 24 to, you realize that the second arm 28 at its one end in the camp 22 is pivotally mounted about the axis A and at its opposite end via a hinge 38 about an orthogonal to the plane of pivot axis B pivotally connected to the first arm 26 connected is.

In case of actuation of one with the actuator assembly 10 equipped vehicle brake is the electric motor 14 electrically driven according to the brake operating force on the brake pedal, so that the output shaft rotates. This causes the drive spindle to rotate 16 according to arrow P ₂ in 2 , With such a rotation, the displaced on the threaded spindle 16 thread-guided spindle nut 18 linear according to arrow P ₃ in the upward direction. Through this linear movement of the spindle nut 18 along the threaded spindle 16 becomes the first arm 26 the knee lever assembly 24 relocated. This displacement of the first arm of the toggle lever assembly 24 is subject to certain constraints. For one, this can be in the floating bearing 32 articulated end of the first arm 26 due to the linear guide of the brake piston 34 in the piston guide 86 only move in a linear direction according to arrow P ₄ . On the other hand, the pivot axis B of the on the first arm 26 arranged joints 38 with which the first arm 26 with the second arm 28 articulated, only on the in 2 move with a dashed line drawn arc of a circle K. This is because the second arm 28 with its one end about the pivot axis A pivotally in the fixed bearing 22 is stored, so that with the joint 38 connected other end of the second arm 28 must move on the circular arc K must. This for a displacement of the spindle nut 18 on the drive spindle 16 compulsive movement of the first arm 26 ultimately leads to a displacement of the brake piston 34 from his in 2 dashed position shown in his in 2 solid and with 34 ' designated position. This means that by a rotation of the threaded spindle 16 and thereby causing displacement of the spindle nut 18 along the threaded spindle 16 a displacement of the brake piston 34 and thus an actuation of the brake can be achieved.

A complementary return movement, for example, by a complementary control of the motor 14 or by a passive switching of the motor 14 and an effect of a corresponding return means can be achieved.

Turning now 3 to, one recognizes one of the brake situation according to 2 deviating constellation. 3 rather shows a possible position of the components of the actuator assembly 10 according to the invention in the case of a parking brake effect.

Starting from the rest position according to 1 became according to arrow P ₅ the drive 12 by the angle α from its in 1 shown position with a substantially vertical orientation of the threaded spindle 16 pivoted about the pivot axis A out. This can be done for example by a parking brake mechanism, not shown, which is coupled to a parking brake lever in a conventional manner, or motorized. Even with such a pivoting of the drive 12 about the pivot axis A is the toggle lever assembly 24 from her in 1 shifted out of rest position shown. Again, with reference to 2 already described movement constraints to take into account, namely on the one hand, the movement of the joint 38 connected end of the second arm 28 on the circular arc K as well as the purely linear displacement of the joint 32 connected end of the first arm 26 along the arrow P. ₄ Due to this BEWE movement constraints shifts in such a pivoting of the drive 12 about the pivot axis A, the spindle nut 18 according to arrow P ₃ on the threaded spindle 16 , this being against a possibly low resistance of the motor 14 can rotate freely. Furthermore, the brake piston shifts from his in 3 dashed lined initial position 34 in his in 3 solid and with 34 ' designated braking position. This means that by pivoting the drive 12 around the pivot axis A turn a displacement of the brake piston 34 inside the piston guide 36 can be achieved and thus a braking effect can be achieved.

To the actuator assembly 10 from the in 3 shown representation in the in 1 due to the initial position shown, the brake mechanism is to be solved accordingly. As already related to 2 explained, such a return movement, for example, by biasing means or Like. Be achieved which the actuator assembly 10 in her in 1 pretension shown rest position.

After referring to 1 to 3 the basic principle of the invention has been explained, will be discussed below on a possible constructive embodiment of the invention, it being noted in advance that this is only a possible embodiment, which does not exhaustively describe the invention. To avoid repetition should, if possible, for the same effect or the same components the same reference numerals as in the description of 1 to 3 be used, but preceded by the number "1".

4 shows a side view of the actuator assembly according to the invention 110 and 5 and 6 each show sectional views along the cutting planes V-V and VI-VI 4 in a housing 120 is the drive 112 pivotally mounted about the axis A. The drive 112 includes an electric motor 114 , with a stator 140 and a rotor 142 , The rotor 142 is over a motor shaft 144 rotatable in a motor housing 146 stored. Specifically, this storage is via two ball bearings 148 and 150 achieved, with the ball bearing 148 directly in the stepped motor housing 146 and the ball bearing 150 in a separately formed housing cover 152 is included. The motor shaft 144 centrally takes a threaded spindle 116 on which rotatably with the motor shaft 144 connected is. In other words, the threaded spindle rotates during a motor movement 116 together with the motor shaft 144 ,

The motor housing 146 has retaining pins on two opposite sides 154 on. At this holding pin 154 is in each case a pivot lever 156 clamped. These pivoting levers 156 extend parallel to the direction of the housing 120 out. The housing 120 has corresponding bearing pin 158 on which plain bearing bushes 160 are plugged. On the plain bearing bushes 160 enclose these around the pivot lever 156 such that they are pivotable about the pivot axis A with little effort. This allows the motor housing 146 to pivot about the pivot axis A. The degree of pivoting is provided by a flexible bellows 162 limited, which between the housing 120 and the motor housing 146 is arranged. Furthermore, this flexible bellows ensures that the interior of the housing 120 is encapsulated and thus penetration of dirt or the like. Can be prevented in this interior.

The journals 158 are provided with a coaxial through-hole, wherein the bore axis coincides with the pivot axis A. In this coaxial through hole are more plain bearing bushes 164 used, each having a bearing pin 166 store stock. The bearing bolts 166 Close substantially flush with the outsides of the trunnions 158 , the plain bearing bushes 160 . 164 and the pivot lever 156 from. From this outside, however, they protrude into the interior of the housing 120 into it. Inside the housing supports the bearing pin 166 one swivel arm each 168 pivotable about the pivot axis A. The swivel arms 168 fulfill the function of the second arm 28 according to the 1 to 3 , These swivel arms 168 extend orthogonal to the pivot axis A. They have in direction parallel position on a coaxial bore with the pivot axis A parallel to the pivot axis B on. In these holes of the swivel arms 168 are again plain bearing bushes 170 used. In the plain bearing bushes 170 engage corresponding journals 172 which extend coaxially, but in opposite directions.

The journals 172 are on an arm 126 molded, which, starting from the bearing pin 172 turn in the direction of the bearing pin 166 extends. At the height of the bearing bolts 166 shows the arm 126 a central hole 174 on, the bore axis is orthogonal to the pivot axis A, but this intersects. On the arm 126 is like 6 it can be seen, a spindle nut 118 mounted, which is provided with an internal thread, in the external thread of the threaded spindle 116 threadedly engages. At the spindle nut 118 is a spherically formed intermediate piece 178 mounted, which in a pan-shaped receiving part 178 is included and can slide in this. The recording part 178 is on the arm 126 attached. Thus, the spindle nut can be 118 relative to the arm 126 by sliding the intermediate piece 176 in the receiving part 178 pivot.

At the one of the central hole 174 distant end of the arm 126 is at this another pan-shaped receiving part 180 attached, in which another spherical spacer 182 intervenes. The intermediate piece 182 is again on a brake piston 184 appropriate. The brake piston 184 is also via a tie rod 186 on the arm 126 held. This is the tie rod 186 on a holding disc 188 which is secured in a reduced diameter portion of the brake piston against sliding out. The brake piston 184 acts with a friction element 190 together, which at his from the brake piston 184 facing away from a friction lining 192 having. This friction lining 192 can when an operation of the brake, either while driving the vehicle or by activating the parking brake, brought into contact with a brake disc, not shown who the.

It should be noted that the brake piston 184 with movement in a receiving opening of the housing 120 is absorbed and can shift in this linear.

The referring to 4 to 6 described embodiment of the invention works as in the schematic representation with reference to 1 to 3 described. This means that to achieve a braking effect in normal operation of the brake in the 4 to 6 at rest shown arrangement by activating the electric motor 114 can be operated. The threaded spindle rotates 116 , so the spindle nut 118 on the threaded spindle 116 is relocated. As a result, the arm pivots 126 , Whose pivotal movement is subject to the above-mentioned constraints: First, the arm must 126 essentially linear with the brake piston 184 can move along and only through that through the components 180 and 182 pivoting realized joint. The other is the movement of the arm 126 imposes a pivoting movement of the pivot axis B about the pivot axis A, since the two pivot arms 168 only allow such a pivoting movement. Finally it comes to the in 2 shown deflection of the entire assembly, so that the friction element 190 is relocated.

However, instead of an electrical control of the engine 114 the entire drive is pivoted about the pivot axis A, for example via a parking brake mechanism or via a motor drive for automatic actuation of the parking brake, so the motor housing pivots 146 due to the pivotable mounting by means of the pivot lever 156 about the pivot axis A. It also pivots the threaded spindle 116 about the pivot axis A, which in turn leads to a deflection of the arm 126 leads. At this deflection, the arm moves 126 on the one hand along the threaded spindle 116 which forcibly rotates against a small motor resistance due to the displacement. This movement of the spindle nut 118 on the threaded spindle 116 is not enough, however, to the pivoting movement of the drive 112 to completely compensate for the pivot axis A. Therefore, also the swivel arms 168 and the arm 126 deflected under the above-described multiple motion constraints, so that in turn to a linear displacement of the brake cylinder housing 184 and to achieve a braking effect. This braking effect is maintained as long as the drive 112 and thus the threaded spindle 116 are pivoted. After swinging back, for example after releasing the parking brake mechanism, then the entire arrangement can be back in 4 to 6 assume the rest position shown.

7 shows a three-dimensional view of the in 4 to 6 described embodiment in a possible installation situation. It should be noted that the actuator assembly 110 in this illustration on a floating caliper arrangement 194 is appropriate. In 7 is also a return spring 196 shown which arm 126 in his in 5 back to the initial position shown. This engages the arm side in a receiving bore of a spring pin 198 who also in 5 can be seen. At its other end is the return spring 196 fixed to the housing in a receiving lug. 7 finally shows a plug receptacle 199 for connecting motor connection cables.

above was an actuator assembly for an electromechanical vehicle brake and a corresponding one Vehicle brake described which in a brake-by-wire vehicle brake system without the requirement of an additional one hydraulic brake system can be used. The actuator assembly according to the invention has the advantage of being easy to implement with mechanical Means a parking brake function offers. Such a mechanical Embodiment still allows the actuator assembly according to the invention relatively compact design, so that opposite a conventional one Realization without parking brake function hardly additional Space is required. Also, the control of the actuator assembly according to the invention in the case of activation of the parking brake is relatively easy.

Claims (21)

Actuator assembly ( 10 ; 110 ) with - a drive ( 12 ; 112 ), - one for actuating a friction element ( 192 ) movable actuator ( 34 ; 184 ) and - a transmission ( 24 ), whereby the transmission ( 24 ) on the input side via a force input element ( 18 ; 118 ) with the drive ( 12 ; 112 ) and the output side with the actuator ( 34 ; 184 ), wherein further the transmission is a knee lever assembly ( 24 ) with two arms ( 26 . 28 ; 126 . 168 ), characterized in that the drive ( 12 ; 112 ) in a camp ( 22 ) is pivotally mounted about a pivot axis (A) and that when pivoting the drive ( 12 ; 112 ) about the pivot axis (A) the knee lever assembly ( 24 ) is deflectable from a rest position so that they the actuator ( 34 ; 184 ) for actuating the friction element ( 192 ) relocated. Actuator assembly ( 10 ; 110 ) according to claim 1, characterized in that the drive ( 12 ; 112 ) for activating a parking brake effect in the fixed bearing ( 22 ) is pivotally mounted about the pivot axis (A). Actuator assembly ( 10 ; 110 ) according to claim 1 or 2, characterized in that a first arm ( 26 ; 126 ) via one movable bearing ( 32 . 30 ) with the actuator ( 34 ; 184 ) and with the force input element ( 18 ; 118 ) is hinged and a second arm ( 28 ; 168 ) with the first arm ( 26 ; 126 ) via a joint ( 38 ) and by means of a pivot axis (A) defining a fixed bearing ( 22 ) in a housing ( 20 ; 120 ) is articulated. Actuator assembly ( 10 ; 110 ) according to one of the preceding claims, characterized in that for activating the vehicle brake, the force input element ( 18 ; 118 ) linearly displaceable and thereby the toggle lever arrangement ( 24 ) is deflectable from a rest position so that they the actuator ( 34 ; 184 ) for actuating the friction element ( 192 ) relocated. Actuator assembly ( 10 ; 110 ) according to one of the preceding claims, characterized in that the drive ( 12 ; 112 ) Is pivotable by means of a parking brake mechanism. Actuator assembly ( 10 ; 110 ) according to claim 3 and one of the preceding claims, characterized in that on the first arm ( 26 ; 126 ) the floating bearing ( 32 ) to the actuator ( 34 ; 184 ) and the floating bearing ( 30 ) to the force input element ( 18 ; 118 ) in each case in the region of the ends of the first arm ( 26 ; 126 ) are arranged and the joint ( 38 ) to the second arm ( 28 ; 168 ) between the ends of the first arm ( 26 ; 126 ), preferably in the middle, is arranged. Actuator assembly ( 10 ; 110 ) according to claim 3 and one of the preceding claims, characterized in that the on the second arm ( 28 ; 168 ) the joint ( 38 ) to the first arm ( 26 ; 126 ) as well as the camp ( 22 ) in each case in the region of one of the ends of the second arm ( 28 ; 168 ) are arranged. Actuator assembly ( 10 ; 110 ) according to claim 3 and one of the preceding claims, characterized in that the second arm ( 28 ; 168 ) shorter than the first arm ( 26 ; 126 ) is trained. Actuator assembly ( 10 ; 110 ) according to one of the preceding claims, characterized in that the drive ( 12 ; 112 ) is designed as a linear drive. Actuator assembly ( 10 ; 110 ) according to one of the preceding claims, characterized in that the drive ( 12 ; 112 ) a spindle drive with a drive spindle ( 16 ; 116 ), wherein the drive spindle ( 16 ; 116 ) by an electric motor ( 14 ; 114 ) is rotationally driven and in the 22 ) is pivotally mounted about the pivot axis (A). Actuator assembly ( 10 ; 110 ) according to claim 10, characterized in that the force input member than on the drive spindle ( 16 ; 116 ) displaceable spindle nut ( 18 ; 118 ) is trained. Actuator assembly ( 110 ) according to one of the preceding claims, characterized by biasing means ( 196 ), which urge the toggle lever assembly into its rest position. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that the housing ( 120 ) a bearing bore and a surrounding coaxial annular extension ( 158 ), wherein the bore axis coincides with the pivot axis (A). Actuator assembly ( 110 ) according to claim 13, characterized in that the drive ( 112 ) via at least one pivot lever ( 156 ) is pivotable about the pivot axis (A), wherein the at least one pivot lever ( 156 ) pivotable on the ring extension ( 158 ) is supported. Actuator assembly ( 110 ) according to claim 10 and 14, characterized in that the electric motor ( 114 ) in a motor housing ( 146 ) is received, on which the pivot lever ( 156 attack). Actuator assembly ( 110 ) according to claim 3 and one of claims 13 to 15, characterized in that in the bearing bore at least one bearing pin ( 116 ) is pivotally mounted, on which the second arm ( 168 ) is supported pivotally. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that to form one of the two arms ( 126 . 168 ) connecting the first arm ( 126 ) at least one journal ( 172 ) and the second arm ( 168 ) one the at least one journal ( 172 ) receiving bore has. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that the second arm ( 168 ) with two, preferably separate, struts ( 168 ) which is on both sides of the first arm ( 126 ). Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that for the formation of the actuator ( 184 ) with the first arm ( 126 ) coupling bearing the actuator ( 184 ) on his first arm ( 126 ) facing spherical area ( 182 ) is formed and in a complementarily shaped receiving pan ( 180 ) on the first arm ( 126 ) and that a tie rod ( 186 ) both elements ( 126 . 184 ) in mutual contact. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that for the formation of the force input member ( 118 ) with the first arm ( 126 ) coupling bearing the force input element ( 118 ) on his first arm ( 126 ) facing spherical area ( 176 ) is formed and in a complementarily shaped receiving pan ( 178 ) on the first arm ( 126 ) intervenes. Vehicle brake, in particular electromechanical vehicle brake, characterized by an actuator assembly ( 10 ; 110 ) according to one of the several of the preceding claims.