DE10308886B3 - Actuator group for electromechanical brake has brake activating drive able to turn in fixed bearing - Google Patents

Abstract

The actuator group (110) includes a drive to activate a parking-brake effect, which can turn about an axis in the fixed bearing. As the drive turns round this axis, the crank lever arrangement is taken out of the rest position to that it can displace the operating member to operate the friction element upon which the braking effect depends.

Description

Background of the Invention

The invention relates to an actuator assembly for one electromechanical vehicle brake and a correspondingly equipped one Vehicle brake with a drive, a movable for actuating a friction element actuator and a transmission, the transmission on the input side via a Force input element with the drive and output side with the actuator is coupled, with the transmission also having a toggle lever arrangement has two arms, of which the first arm each with a floating bearing the actuator and is articulated to the force input member and the second Arm with the first arm over coupled a joint and by means of a defining a pivot axis Fixed bearing in one housing is articulated, and being used to activate the vehicle brake the force input member is linearly displaceable and thereby the toggle lever arrangement is deflectable from a rest position such that it is the actuator for actuation of the friction element shifted.

In the past, vehicle brakes were common formed such that hydraulically operated cylinder-piston arrangements via a Hydraulic circuit coupled directly to a hydraulic pressure source are, which if necessary by means of a brake booster via a Brake pedal is controllable. Such braking systems have, however the disadvantage that a relatively high Installation and parts effort 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 prone to errors, especially because they occur after a certain period of operation Leaks can lead to failure of the vehicle brake system. Therefore there are efforts to use vehicle brake systems that do not Hydraulic system require more. This is particularly useful electrically operated Vehicle brake systems, whereby in this context one also speaks of "brake-by-wire" brake systems. With such electrically operated Vehicle braking systems are commonly used Each vehicle wheel is assigned a brake unit that has a disc or drum brake and a brake piston. The brake piston serves as an actuator and presses 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 with regard to actuation force, actuation stroke, duration of operation etc. according to the type of activity of the brake pedal.

A purely electromechanically operated vehicle brake system and corresponding actuator assembly is off, for example WO 98/01682 A1 known. This prior art describes an actuator assembly of the type mentioned and one Correspondingly trained vehicle brake. The toggle assembly is by means of an electric drive from a rest position deflected and thereby the actuator and ultimately shifted the friction element. Via a floating saddle arrangement is achieved that the friction element together with an opposite Friction element presses on both sides of a brake disc and thus a braking effect leads. Besides one like that over however, it is also a brake pedal initiated braking effect required, a parking brake function, one speaks of Parking brake function to provide. To achieve this, looks WO 98/01682 A1 proposes that in addition to an introduction of force the electric drive, the toggle lever arrangement another Provides point for force application, 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 arrangement can be designed accordingly must and therefore with regard to the required installation space, the number of components and the assembly effort has disadvantages.

In contrast, it is an object of the present Invention, an actuator assembly of the type mentioned and a vehicle brake formed with such an actuator assembly To provide, in which a parking brake function under less technical effort is realizable.

Solution according to the invention

This object is achieved by an actuator assembly and a vehicle brake equipped with such an actuator assembly, the actuator assembly having a drive, an actuating element that can be moved to actuate a friction element, and a transmission, the transmission being coupled to the drive on the input side via a force input element and to the actuating element on the output side is further, the transmission has a toggle lever arrangement with two arms, of which the first arm is coupled in an articulated manner to the actuating member and to the force input member via a floating bearing, and the second arm is coupled to the first arm via a joint and by means of a pivot axis defining a pivot axis Fixed bearing is articulated in a housing, and wherein to activate the vehicle brake, the force input member is linearly displaceable and thereby the toggle lever arrangement can be deflected from a rest position such that it displaces the actuating member for actuating the friction element. In the actuator assembly according to the invention it is provided that the drive for activating a parking brake is pivotally mounted in the fixed bearing about the pivot axis and that when the drive is pivoted about the pivot axis the toggle lever arrangement can be deflected from the rest position such that it actuates the actuating element for actuating the friction element relocated.

In an ordinary braking operation during the Driving is in the actuator assembly according to the invention the drive is controlled in accordance with the brake actuation force exerted on the brake pedal and thereby moves the force input member. With the movement of the Force input member is the toggle assembly out of its rest position moves so that the actuator and with this the friction element moves. After releasing the brake pedal, i.e. after reducing the braking force to zero, moves the toggle lever arrangement back to its rest position and the The braking effect is canceled. For example, be the driver If the vehicle is off, the parking brake must be activated. A braking effect is not achieved via the drive of the actuator assembly brought about, but by swiveling the - in this case passive - drive around the swivel axis, which in turn causes the toggle lever arrangement their rest position is deflected and thereby the actuator and shifted the friction element to achieve a braking effect. If the parking brake is to be deactivated, the drive is activated in its original Position pivoted back about the pivot axis, so that the toggle lever arrangement is also back in its Rest position moves and the braking effect is released.

Advantageous configurations and developments of the invention

Swiveling the drive around the swivel axis can be either motor or mechanical. A motorized pivoting is useful, for example, 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 further development of the invention Parking brake mechanism can be provided, which without additional on the Vehicle electronics energy expenditure by one of the Actuator force to be applied by driver operable and correspondingly solvable is. Therefor can a parking brake lever known per se mechanically with the Actuator assembly to be coupled.

With regard to the design of the Gear is provided in a further development of the invention that on the first arm the floating bearing to the actuator and the floating bearing to the force input member in the area of the ends of the first arm are arranged and the joint to the second arm between the ends of the first arm, preferably in the middle. Furthermore, When designing the transmission, it should be provided that on the second Arm the joint to the first arm and the fixed bearing in each area one of the ends of the second arm are arranged. Arranging the bearings leads at the ends of the arms that the maximum arm length exploited and thus an optimal use of the available leverage at the same time compact design possible is. To make the transmission even more compact, is In a further development of the invention, the second Arm shorter than the first arm is formed.

The drive can be of various types be trained. An inexpensive and structurally relatively simple solution let yourself thereby achieve that the drive is designed as a linear drive is. Piezo drives, linear motors, for example, come as linear drives or the like in question. A structurally simple and inexpensive variant of the invention provides that the drive is a spindle drive with a drive spindle has, wherein the drive spindle rotated by an electric motor and is pivotally mounted in the fixed bearing about the pivot axis is. In this development 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 Ball circulation should be designed to keep friction losses low. The use of a spindle drive has the advantage that it is inexpensive, robust and is easy to maintain.

In principle, the drive can be used around the toggle lever arrangement from its rest position into a deflected position and from this deflected position back to its rest position move. However, a further development of the invention provides prestressing means forward, which push the toggle lever arrangement back into its rest position. at In this development of the invention, the drive is only used if the toggle lever arrangement is to be transferred from its rest position into a deflected position. Can be used as a preload For example, spring elements, rubber buffers or the like can be used.

With regard to the fixed bearing defining the pivot axis, which supports the second arm in the housing in an articulated manner and serves as a pivot point for the drive, in particular for the drive spindle when a spindle drive is used, it is provided in one exemplary embodiment of the invention that the housing has a bearing bore and one that se surrounding coaxial ring extension, the bore axis coinciding with the pivot axis. In order to implement the pivotable drive, it is provided in this exemplary embodiment of the invention that the drive can be pivoted about the pivot axis via at least one pivot lever, the at least one pivot lever being pivotably supported on the ring extension. When using an electric motor for the drive, it can be provided that the electric motor is accommodated in a motor housing on which the pivot levers engage.

The pivoting of the second arm can about the pivot axis in this embodiment of the invention constructively achieved in that in the bearing bore Bearing pin is pivotally mounted on which the second arm swiveling supports. Furthermore, in this development of the invention, that to form a joint connecting the two arms of the first arm at least one journal and the second arm one has at least one bearing bore receiving bore. in principle it is sufficient if the individual arms of the toggle lever arrangement as Single struts executed are. However, the knee lever arrangement is more stable, if the second arm with two, preferably separate, struts accomplished which is on both sides of the first arm. This can be a Torsion or buckling of the toggle lever arrangement are suppressed more effectively, what the reliability the actuator assembly according to the invention and a suitably equipped one Vehicle brake further increased.

With regard to the design of the individual joints can be provided for the formation of the the actuator with the first arm coupling floating bearing the actuator on the first arm-facing region is spherical and in a complementary trained receiving pan engages on the first arm and that a Tie rod holds both elements in mutual contact.

Furthermore, in this context further be provided that for the formation of the force input member with the first arm coupling floating bearing to the force input member its region facing the first arm is spherical and in a complementary trained receiving pan engages on the first arm.

A major advantage of having a the actuator assembly according to the invention equipped vehicle brake is that the swiveling the actuator assembly (motor-spindle unit) also to an essential Improves the efficiency of the vehicle brake leads because when actuated occurring transverse or lateral forces are compensated become. This pivotability of the actuator assembly is also for the self-releasing behavior the vehicle brake required. The underlying toggle lever geometry is theoretical free of lateral or lateral forces, so that the actuator assembly cannot be pivoted would. Indeed occur due to the play in the bearings in a conventional In practice, toggle lever geometry has lateral or lateral forces.

The invention is illustrated below by way of example of the accompanying figures. They represent:

1 is a schematic representation of the innovation actuator assembly with a toggle arrangement in the rest position;

2 a view accordingly 1 , in which 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 inventive actuator assembly in side view;

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

6 a sectional view of the embodiment according to 4 and 5 , cut out 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 Embodiments of the invention

In 1 the actuator assembly is shown schematically and generally with 10 designated. 1 shows the actuator assembly 10 in its initial position (rest position), ie no braking effect is initiated by actuating the brake pedal or by activating the parking brake. The actuator assembly 10 includes a drive 12 , This is designed with an electric motor 14 , one from the electric motor 14 according to the double arrow P _1, rotationally drivable threaded spindle 16 and one on the lead screw 16 arranged, with this in threaded engagement spindle nut 18 , The threaded spindle 16 is on a housing 20 via a fixed camp 22 pivotable about a pivot axis A and rotatable about its longitudinal axis according to arrow P ₁ .

The actuator assembly 10 also includes a toggle lever arrangement 24 executed gear. The toggle assembly 24 includes a first arm 26 and a second arm 28 , The first arm 26 is at one end in a hinge 30 um an axis orthogonal to the plane of the drawing can be pivoted on the spindle nut 18 stored. With its opposite end is the first arm 26 about a floating camp 32 mounted on a brake piston 34 so as to be pivotable 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 in 1 to 3 Control the friction element, not shown, either directly or indirectly, which then acts on a brake disk in a manner known per se, for example via a floating caliper arrangement.

If you turn back to the toggle arrangement 24 too, you can see that the second arm 28 at one end in the fixed camp 22 is pivotally mounted about the axis A and at its opposite end via a joint 38 pivotable with the first arm about a pivot axis B orthogonal to the plane of the drawing 26 connected is.

In the case of actuation of one with the actuator assembly 10 equipped vehicle brake is the electric motor 14 electrically controlled in accordance with the brake operating force on the brake pedal, so that its output shaft rotates. This turns the drive spindle 16 according to arrow P ₂ in 2 , With such a rotation, it shifts on the threaded spindle 16 threaded spindle nut 18 linearly 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 toggle arrangement 24 relocated. This displacement of the first arm of the toggle assembly 24 however, is subject to certain constraints. On the one hand, this can happen in the floating camp 32 articulated end of the first arm 26 due to the linear guidance 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 joint 38 with which the first arm 26 with the second arm 28 is articulated, only on the in 2 move the circular arc path K drawn with a chain line. This is because the second arm 28 with one end pivotable about the pivot axis A 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 path K. 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 its in 2 position shown in dashed lines in its in 2 solid and with 34 ' designated position. This means that by turning the threaded spindle 16 and a resulting 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 can be achieved, for example, by a complementary control of the motor 14 or by passive switching of the motor 14 and an effect of a corresponding restoring means can be achieved.

If you turn now 3 too, you can recognize one according to the braking situation 2 different constellation. 3 rather shows a possible position of the components of the actuator assembly 10 in the event of a parking brake effect.

Starting from the rest position according to 1 became the drive according to arrow P ₅ 12 by the angle α from its in 1 shown position pivoted about the pivot axis A out with Chen wesentli vertical alignment of the threaded spindle. This can be done, for example, by means of a parking brake mechanism, not shown, which is coupled to a parking brake lever in a manner known per se, or else by means of a motor. Even with such a swiveling of the drive 12 about the pivot axis A is the toggle lever arrangement 24 from their in 1 shown rest position shifted out. Again, those are related to 2 to take into account already described movement constraints, namely, on the one hand, the movement of the joint 38 connected end of the second arm 28 on the circular arc path K as well as the purely linear displacement of the with the joint 32 connected end of the first arm 26 along the arrow P ₄ . Due to these constraints of movement, such a pivoting of the drive shifts 12 around the swivel axis A the spindle nut 18 according to arrow P ₃ on the threaded spindle 16 , which is against a possibly low resistance of the motor 14 can rotate freely. Furthermore, the brake piston moves from its in 3 Starting position drawn in dashed lines 34 in his in 3 solid and with 34 ' designated braking position. This means that by swiveling the drive 12 around the pivot axis A, in 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 representation shown in the in 1 the starting position shown, the brake mechanism must be released accordingly. As already with reference to 2 explained, such a resetting movement can be achieved, for example, by pretensioning means or the like, which the actuator assembly 10 in their in 1 Preload the rest position shown.

After regarding 1 to 3 the basic principle of the ending has been explained, a possible constructive embodiment of the invention will be discussed below, it being noted in advance that this is merely a possible embodiment which does not conclusively describe the invention. In order to avoid repetitions, if possible, for compos with the same effect or of the same type same reference numerals as in the description of the 1 to 3 can be used, but prefixed with the number "1".

4 shows a side view of the new actuator assembly 110 and figures 5 and 6 issue sectional views along the VV and VI-VI cutting planes 4 in a housing 120 is the drive 112 pivoted about the axis A. The drive 112 includes an electric motor 114 , with a stator 140 and a rotor 142 , The rotor 142 is about a motor shaft 144 rotatable in a motor housing 146 stored. In detail, this bearing is made up of two ball bearings 148 and 150 reached, the ball bearing 148 directly in the stepped motor housing 146 and the ball bearing 150 in a specially designed housing cover 152 is included. The motor shaft 144 takes a central spindle 116 on which is rotatable with the motor shaft 144 connected is. In other words, the threaded spindle rotates when the motor moves 116 together with the motor shaft 144 ,

The engine case 146 has retaining pins on two opposite sides 154 on. On this holding pin 154 is a swivel lever 156 clamped. These swivel levers 156 extend parallel to the housing 120 out. The housing 120 has corresponding bearing journals 158 on which plain bearing bushes 160 are attached. On the plain bearing bushes 160 these encompass the swivel levers 156 such that they can be pivoted about the pivot axis A with little effort. This allows the motor housing 146 swivel around the swivel axis A. The extent of the pivoting is determined 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 can thereby prevent dirt or the like from entering this interior.

The bearing journals 158 are provided with a coaxial through hole, the axis of the hole coinciding with the swivel axis A. In this coaxial through hole there are further bushings 164 used, each with a bearing pin 166 pick up in stock. The bearing bolts 166 close essentially flush with the outside of the trunnions 158 , the plain bearing bushes 160 . 164 and the swivel lever 156 from. From this outside, however, they protrude into the interior of the housing 120 into it. Inside the housing is supported on the bearing pin 166 one swivel arm each 168 pivotable about the pivot axis A. The swivel arms 168 perform the function of the second arm 28 according to the 1 to 3 , These swivel arms 168 extend orthogonally to the swivel axis A. In the case of a position parallel to the direction, they have a coaxial bore with the swivel axis B parallel to the swivel axis A. In these bores of the swivel arms 168 are in turn plain bearing bushes 170 used. In the plain bearing bushes 170 grip corresponding bearing journals 172 , which extend coaxially, but in the opposite direction.

The bearing journals 172 are on one arm 126 molded, which is based on the bearing journal 172 again in the direction of the bearing bolts 166 extends. At the level of the bearing bolts 166 points the arm 126 a central hole 174 whose bore axis is orthogonal to the pivot axis A, but intersects it. On the arm 126 is like 6 can be seen, a spindle nut 118 attached, which is provided with an internal thread that fits into the external thread of the threaded spindle 116 engages thread. On the spindle nut 118 is a spherical intermediate piece 176 attached, which in a pan-shaped receiving part 178 is recorded and can slide in it. 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 recording part 178 pivot.

At that from the central hole 174 distal end of the arm 126 is another pan-shaped receiving part on this 180 attached, in which another spherical intermediate piece 182 intervenes. The intermediate piece 182 is in turn on a brake piston 184 appropriate. The brake piston 184 is also via a tie rod 186 on the arm 126 held. The tie rod lies there 186 on a holding disc 188 on, which is secured in a reduced-diameter section of the brake piston against sliding out. The brake piston 184 works with a friction element 190 together, which at its by the brake piston 184 facing away from a friction lining 192 having. This friction lining 192 can be brought into contact with a brake disc, not shown, when the brake is actuated, be it while the vehicle is moving or by activating the parking brake.

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

The related to 4 to 6 The embodiment of the invention described works as in the schematic illustration with reference to 1 to 3 be described. This means that in order to achieve a braking effect in normal operation of the brake the in the 4 to 6 Arrangement shown in the rest position by activating the electric motor 114 can be operated. The threaded spindle turns 116 so the spindle nut 118 on the threaded spindle 116 is shifted. This causes the arm to pivot 126 , whose pivoting movement is subject to the above-mentioned constraints: On the one hand, the poor 126 essentially linear with the brake piston 184 and can only move through the components 180 and 182 swivel realized joint. The other is the movement of the arm 126 a pivoting movement of the pivot axis B about the pivot axis A is imposed because the two pivot arms 168 only allow such a pivoting movement. Ultimately it comes to the in 2 deflection of the entire arrangement shown, so that the friction element 190 is shifted.

However, instead of an electrical control of the motor 114 the entire drive is pivoted about the pivot axis A, for example via a parking brake mechanism or via a motor drive for automatically actuating the parking brake, the motor housing pivots 146 due to the swivel mounting by means of the swivel lever 156 around the swivel axis A. The threaded spindle also swivels 116 around the pivot axis A, which in turn leads to a deflection of the arm 126 leads. With this deflection, the arm moves 126 on the one hand along the threaded spindle 116 , which forcibly rotates against a low motor resistance due to the deflection. This movement of the spindle nut 118 on the threaded spindle 116 however, it is not sufficient for the pivoting movement of the drive 112 to completely compensate the pivot axis A. Hence the swivel arms 168 and the arm 126 deflected under the movement constraints described several times above, so that in turn there is a linear displacement of the brake piston 184 and to achieve a braking effect. This braking effect is maintained for so long, again drive 112 and thus the threaded spindle 116 are pivoted. After swiveling back, for example after releasing the parking brake mechanism, the entire arrangement can then be in again 4 to 6 take the rest position shown.

7 shows a three-dimensional view of the in 4 to 6 Embodiment described 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 the arm 126 in his in 5 shown starting position clamps back. This engages on 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 mounting bracket. 7 finally shows a connector holder 199 for connecting motor connection cables.

Above was an actuator assembly for one electromechanical vehicle brake and a corresponding vehicle brake described which in a brake-by-wire vehicle brake system without the need for an additional hydraulic braking system can be used. This actuator assembly has the advantage that it is easy to implement mechanical Provides a parking brake function. Such a mechanical Design nevertheless allows the actuator assembly to be relatively compact to design so that opposite a conventional one Realization without parking brake function hardly any additional Space is required. Also the actuation of the actuator assembly according to the innovation in the case of activation of the parking brake is relatively simple.

Claims (18)

Actuator assembly ( 10 ; 110 ) for an electromechanical vehicle brake with - one drive ( 12 ; 112 ), - an actuating member movable for actuating a friction element (190) ( 34 ; 184 ) and - a gearbox ( 24 ), the gear ( 24 ) on the input side via a force input element ( 18 ; 118 ) with the drive ( 12 ; 112 ) and on the output side with the actuator ( 34 ; 184 ) is coupled, the transmission further comprising a toggle lever arrangement ( 24 ) with two arms ( 26 . 28 ; 126 . 168 ), of which the first arm ( 26 ; 126 ) via one floating bearing ( 32 . 30 ) with the actuator ( 34 ; 184 ) and with the force input link ( 18 ; 118 ) is articulated and the second arm ( 28 ; 168 ) with the first arm ( 26 ; 126 ) via a joint ( 38 ) coupled and by means of a fixed bearing defining a swivel axis (A) ( 22 ) in a housing ( 20 ; 120 ) is articulated, and the force input element () for activating the vehicle brake ( 18 ; 118 ) linearly displaceable and thereby the toggle lever arrangement ( 24 ) can be deflected from a rest position in such a way that it actuates the actuator ( 34 ; 184 ) to operate the friction element ( 190 ), characterized in that the drive ( 12 ; 112 ) to activate a parking brake effect in the fixed bearing ( 22 ) is pivotally mounted about the pivot axis (A) and that when the drive is pivoted ( 12 ; 112 ) around the swivel axis (A) the toggle lever arrangement ( 24 ) can be deflected from the rest position in such a way that it actuates the actuator ( 34 ; 184 ) to operate the friction element ( 190 ) shifted. Actuator assembly ( 10 ; 110 ) according to claim 1, characterized in that the drive ( 12 ; 112 ) is pivotable by means of a parking brake mechanism. Actuator assembly ( 10 ; 110 ) according to claim 1 or 2, 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 link ( 18 ; 118 ) in the area of 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. Actuator assembly ( 10 ; 110 ) according to one of the preceding claims, characterized in that on the second arm ( 28 ; 168 ) the joint ( 38 ) to the first arm ( 26 ; 126 ) as well as the fixed camp ( 22 ) each in the area of one of the ends of the second arm ( 28 ; 168 ) are arranged. Actuator assembly ( 10 ; 110 ) according to 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 ), the drive spindle ( 16 ; 116 ) by an electric motor ( 14 ; 114 ) is driven in rotation and in the fixed bearing ( 22 ) is pivotally mounted about the pivot axis (A). Actuator assembly ( 10 ; 110 ) according to claim 7, characterized in that the force input member as 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 push the toggle lever arrangement 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 coaxial ring extension surrounding it ( 158 ), the bore axis coinciding with the swivel axis (A). Actuator assembly ( 110 ) according to claim 10, characterized in that the drive ( 112 ) via at least one swivel lever ( 156 ) can be pivoted about the pivot axis (A), the at least one pivot lever ( 156 ) swiveling on the ring process ( 158 ) supports. Actuator assembly ( 110 ) according to claim 7 and 11, characterized in that the electric motor ( 114 ) in a motor housing ( 146 ) on which the swivel lever ( 156 ) attack. Actuator assembly ( 110 ) according to one of claims 10 to 12, characterized in that in the bearing bore at least one bearing pin ( 116 ) is pivotally mounted on which the second arm ( 168 ) pivotally supported. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that to form one of the two arms ( 126 . 168 ) connecting joint the first arm ( 126 ) at least one journal ( 172 ) and the second arm ( 168 ) the at least one bearing journal ( 172 ) has a receiving bore. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that the second arm ( 168 ) is designed with two, preferably separate, struts, which on both sides of the first arm ( 126 ) run. Actuator assembly ( 110 ) according to one of the preceding claims, characterized in that to form the actuator ( 184 ) with the first arm ( 126 ) coupling the floating bearing the actuator ( 184 ) on his first arm ( 126 ) spherical area ( 182 ) is formed and in a complementarily designed receptacle ( 180 ) on the first arm ( 126 ) engages and that a tie rod ( 186 ) both elements ( 126 . 184 ) holds in mutual investment. 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 the floating bearing the force input member ( 118 ) on his first arm ( 126 ) spherical area ( 176 ) is formed and in a complementarily designed receptacle ( 178 ) on the first arm ( 126 ) intervenes. Vehicle brake, in particular electromechanical vehicle brake, characterized by an actuator assembly ( 10 ; 110 ) according to one or more of the preceding claims.