Acceleration-compensated locking mechanism for electromechanical service brakes, electromechanical service brakes, and method for activating the locking mechanism.

Abstract

This relates to a locking mechanism for use in electromechanical service brakes. [Solution] A locking mechanism (01) for locking the movement of an electromechanical service brake, particularly a release movement that reduces the clamping force between two friction mating parts, preferably for use in an automobile, particularly in a passenger car, comprising a locking bolt (03) arranged to engage with an electromechanical service brake locking member (02) to lock the movement of the electromechanical service brake when the locking mechanism (01) is in a locked state, and to release the locking member (02) when the locking mechanism (01) is in an unlocked state, further comprising an actuator (04), particularly an electromagnetic linear actuator (05) or linear drive, for displacing the locking bolt (03) between a locked state and an unlocked state.

Description

Technical Field

[0001] The present invention relates to a locking mechanism for use in an electromechanical service brake, preferably for use in an automobile. Further, the present invention relates to an electromechanical service brake having a locking mechanism, and a method of operating the locking mechanism.

Background Art

[0002] To embody a parking brake function in an electromechanical service brake, various technical solutions are known in the prior art. Patent Document 1 describes a method of operating a parking brake facility integrated in an electromechanical service brake. For operation of the parking brake, when the vehicle is stopped, the electromechanical service brake is operated by its brake actuator and locked by a locking mechanism at the operated position, whereby the release movement is locked. The locking mechanism includes a locking pawl and a ratchet wheel coupled to the brake actuator. To lock, the movement of the locking pawl is released by a locking bar and then the locking pawl engages with the ratchet wheel. The unlocking of the locking pawl and the operation of the locking pawl are each embodied by an electromagnet. At this time, the locking bar ensures that the locking pawl does not accidentally engage with the ratchet wheel, which can be caused by vibrations, for example, during driving operation. The disadvantage of this solution is that the cost is high. This is because two actuators are required for operation of the locking mechanism, which involves an increase in costs related to cable wiring, control technology, and design space.

[0003] Patent Document 2 describes an alternative locking mechanism for locking an electromechanical service brake. A locking bolt is configured to move linearly for engagement with a ratchet wheel. A linear actuator is controlled to lock the ratchet wheel, thereby displacing the locking bolt to a position that locks the ratchet wheel against the spring force of a return spring. This spring force is selected to be such that unintended displacement of the locking bolt is reliably prevented when external acceleration acts on the mechanism. Overcoming such a strong spring force when activating the locking mechanism requires a powerful linear actuator, which is disadvantageous in terms of cost, design space, mass, and power demand. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] German Patent Application Publication No. 10224688 [Patent Document 2] DE10234848 [Overview of the project] [Problems that the invention aims to solve]

[0005] The object of the present invention is to provide a locking mechanism, an electromechanical service brake, and a method for activating the locking mechanism, which overcome the drawbacks of the prior art described above. [Means for solving the problem]

[0006] The locking mechanism according to the present invention having the constituent elements of claim 1, the electromechanical service brake having the constituent elements of claim 9, and the method for activating the locking mechanism according to the present invention having the constituent elements of claim 10 have the advantage that external acceleration does not cause an unintended transition of the locking mechanism to a locked state. In this case, the locking mechanism according to the present invention has the advantage of being mechanically simple to configure, especially without additional actuator devices. Furthermore, there is no need for a particularly powerful actuator, which preferably results in lower costs with respect to the design of electronic and / or electrical components. Accordingly, the locking mechanism according to the present invention has the advantage of being compact and lightweight. Therefore, the electromechanical service brake having the locking mechanism according to the present invention is also preferably simple and compact to configure.

[0007] A locking mechanism according to the present invention for locking the movement of an electromechanical service brake, particularly the release movement that reduces the clamping force between two friction mating parts, preferably for use in automobiles, particularly in passenger cars, includes a locking bolt arranged to engage with a locking member of an electromechanical service brake to lock the movement of the electromechanical service brake when the locking mechanism is in a locked state, and to release the locking member when the locking mechanism is in an unlocked state. The locking mechanism further includes an actuator, particularly an electromagnetic linear actuator or linear drive, for displacing the locking bolt between a locked state and an unlocked state.

[0008] According to the present invention, the lever mechanism is designed in particular in a mass-compensated manner to couple an actuator with a lock bolt, and the effective lever length of the lever mechanism for the lock bolt and the effective lever length for the actuator are a ratio such that the inertial forces acting on the lock bolt, the actuator, and / or the lever mechanism are compensated for based on an external acceleration acting on the lock mechanism, and the lock bolt remains unlocked regardless of the value and / or direction of the external acceleration, starting from the unlocked state. External acceleration is understood in this case to be acceleration that occurs when the vehicle is in operation and acts from the outside on the wheel and all components of the wheel, namely the electromechanical service brake and consequently on the lock mechanism. Such external acceleration can occur, for example, when passing over a pothole and / or when driving over the corner of a curb. In this case, the acceleration can occur in the range of at least 10 to a maximum of 100 times the acceleration due to gravity. Forces of varying magnitudes act on these components, depending on the mass of the components accelerated by the external acceleration. Such a force is referred to as inertial force in this case. The term mass force is also commonly used in engineering. This inertial force is compensated for by the lever mechanism according to the present invention. The lock bolt is preferably supported so as to be able to move in a straight line. When the lock mechanism is locked, the lock bolt is inserted into the lock member, and when it is unlocked, the lock bolt is removed from the lock member. The lock member of the lock mechanism is preferably a ratchet wheel that is non-rotatably coupled to the spindle drive of an electromechanical service brake, thereby allowing the rotation of the spindle drive to be locked by the lock mechanism. The lever mechanism is preferably designed so that the lock mechanism remains stable from the perspective of external acceleration even when it is locked, thereby maintaining the locked state from the starting point even under external acceleration.In this case, the friction partners are understood to be the brake pads and brake discs in the case of a disc brake embodiment, or the brake shoes and brake drum in the case of a drum brake embodiment. The friction partners are relatively movable and are configured to generate braking force. The release movement is understood to be the relative movement of the friction partners that reduces the clamping force between them, and consequently the braking force. In other words, an electromechanical service brake is released by the release movement. As the actuator, an electromagnetic linear actuator is preferably used in the lock mechanism according to the present invention, because it is particularly simple to configure and can be easily controlled. In this case, the armature, which is capable of linear motion, is displaceable by electromagnetic force and is coupled to a lever mechanism.

[0009] A preferred development of the locking mechanism according to the present invention is described in the dependent claims.

[0010] In a first preferred embodiment of the locking mechanism, there may be a single oscillating lever rotatably supported about a rotation axis, to which a locking bolt and an actuator are pivoted on opposite sides with respect to the rotation axis, thereby generating moments in opposite directions with respect to the rotation axis as inertial forces acting on the locking bolt, the actuator, particularly the movable armature, and the oscillating lever based on external acceleration. The oscillating lever is also known as a two-arm lever, enabling a mechanically preferred and simple embodiment of the locking mechanism. The oscillating lever has a rotation axis and pivot points for other components, in this case the locking bolt and the actuator, on two different sides of the lever with respect to the rotation axis. Since external acceleration generates inertial forces in the same direction, the inertial forces acting on the oscillating lever on opposite sides with respect to the rotation axis as inertial forces generate moments in opposite directions with respect to the rotation axis.

[0011] In another embodiment of the locking mechanism, which is a preferred development of the above embodiment, the effective lever length of the oscillating lever for the lock bolt and the effective lever length for the actuator are in a ratio such that opposing moments generate moment equilibrium with respect to the axis of rotation. The value of the inertial force depends on the mass of each accelerated component and the value of the external acceleration. Accordingly, the inertial forces acting on the lock bolt and the actuator are in a fixed ratio with respect to each other, because the external acceleration acts equally on the lock bolt and the actuator. This ratio is kept constant even when the locking mechanism is in operation. By appropriately adjusting and selecting the effective lever length depending on the mass of the lock bolt and the movable or accelerated mass of the actuator, it is possible to achieve moments of equal value. Based on the opposing directions of action of each moment, moment equilibrium is achieved under moments of equal value. Therefore, the oscillating lever on which these moments act, and consequently the locking mechanism, remain stationary regardless of the value of the external acceleration.

[0012] In another preferred embodiment of the locking mechanism, there may be a damping means that dampens the movement of the locking mechanism, which may be pivotally mounted on the lock bolt, actuator, or lever mechanism. The damping means more preferably contributes to suppressing unintended movement of the lock bolt. For example, based on manufacturing tolerances, perfect moment equilibrium is practically impossible to achieve. The effect of the remaining residual moment can be technically and easily reduced by the damping means. In this application, the damping means can have a high damping ratio, for this application does not require high dynamics of the desired movement of the locking mechanism. The damping means may be preferably and easily configured as a friction damper, particularly integrated into the support of the lever mechanism, for example, as a linear guide for a lock bolt with high sliding friction, or as a rotational support for a rotating shaft with high friction. The damping means may also be pivotally mounted on the lever mechanism as an additional component, for example, as a fluid damper.

[0013] In another preferred embodiment of the locking mechanism, there may be a spring means, which may be pivotally supported on the lock bolt, actuator, or lever mechanism, that applies an initial stress to the locking mechanism toward an unlocked state. The spring means preferably acts as a simple means to move the actuator from an actuated state to a deactuated state, and consequently the locking mechanism from a locked state to an unlocked state, thereby allowing for the application of a simpler actuator, which clearly simplifies the actuator. Under inertial forces that are not fully compensated, the spring means preferably acts to ensure the prevention of unintended movement of the locking mechanism, since the spring means acts against residual moments acting particularly on the lever mechanism. Based on the fact that the inertial forces are substantially compensated in this case, the spring means preferably can have a low spring constant. The spring means is particularly space-efficient and therefore preferred to be integrated into the actuator, for example, as a coil spring acting on the armature and / or lock bolt. Preferably, in an electromagnetic linear actuator, a spring mechanism generates a spring force that resists the magnetic force, thereby pulling the linear actuator back when it is not energized. Alternatively, the spring mechanism may be arranged concentrically around the lock bolt, or it may be arranged as an additional component in the lever mechanism. The spring mechanism may be configured in various designs, for example, as a compression coil spring, a tension coil spring, or a leaf spring.

[0014] In yet another embodiment of the locking mechanism, which preferably develops the above embodiments, the spring means may have a spring force that is 1.3 times, preferably 1.2 times, and more preferably 1.1 times, the minimum mechanically required restoring force resulting from tolerances and / or friction. A spring force selected in this manner has the advantage of enabling reliable return of the locking mechanism from the locked state to the unlocked state. The return of the locking mechanism by the spring means has the further advantage of being a passive process that does not require precise control, which preferably reduces the cost for actuators and control technology. In this case, friction in the lever mechanism and / or actuator in particular may act to resist the return. There is a further advantage that the spring force is smaller compared to the prior art, and therefore only an actuator with a low operating force is required.

[0015] In another preferred embodiment of the locking mechanism, the direction of motion of the lock bolt and the direction of motion of the actuator for displacing the lock bolt between the unlocked and locked states may be arranged parallel to each other. This parallel alignment of the lock bolt's direction of motion and the actuator's direction of motion ensures that inertial forces based on external acceleration act preferably similarly on the lock bolt and the actuator with respect to their respective directions of motion. That is, the inertial force acting on the lock bolt and the inertial force acting on the actuator act in the same relative proportions parallel to the direction of motion and perpendicular to the direction of motion. This holds true regardless of the direction of external acceleration. Consequently, there is the advantage that compensation for inertial forces acts regardless of the direction of external acceleration.

[0016] In yet another embodiment of the locking mechanism, which is an alternative to the above embodiment, the direction of motion of the lock bolt and the direction of motion of the actuator for displacing the lock bolt between the unlocked and locked states may be bent at an angle to each other, with the angle bisector of this angle being parallel to the principal direction of action of external acceleration. This embodiment may be preferred depending on a given and / or limited design space. The principal direction of action is understood here to be the direction of action of external acceleration that occurs with the greatest frequency and / or value when operating. With respect to a vehicle, it is advantageous that the principal direction of action of external acceleration can be adjusted perpendicular to the direction of motion of the vehicle. For example, when passing over a pothole in the road, an external acceleration directed vertically upward acts on the wheel and on the electromechanical service brake having the locking mechanism according to the present invention. With respect to such a principal direction of action, the direction of motion of the lock bolt and the direction of motion of the actuator are adjusted symmetrically so that the inertial force generated in this principal direction of action is compensated by the lever mechanism. In this embodiment, spring means and / or damping means are particularly preferred because, in this way, unintended displacement of the lock bolt is suppressed under the imperfect compensation of the primary direction of action and associated inertial forces and external acceleration in substantially different directions of action.

[0017] Furthermore, the present invention relates to an electromechanical service brake, preferably in an automobile, particularly in a passenger car, for use, and especially as a parking brake, which includes at least the locking mechanism according to the present invention. In a preferred embodiment, the electromechanical service brake has a spindle drive that can convert rotational driving motion into translational motion, which is transmitted to the brake pads. Or can be transmitted in this way. The spindle drive can thus apply a pressing force to the brake pads on the brake disc. For preferred and simple integration of a parking brake function into the electromechanical service brake, the service brake includes the locking mechanism according to the present invention. For this purpose, a ratchet wheel as a locking member may be non-rotatably coupled to the spindle nut of the spindle drive, so that when a braking force is applied, i.e., when the brake is applied, the ratchet wheel is locked by a locking bolt, thereby locking the rotation of the spindle nut, and consequently the axial motion of the spindle drive, in particular the release of the brake.

[0018] Furthermore, the present invention relates to a method for operating a locking mechanism to lock the movement of an electromechanical service brake for use in an automobile, particularly in a passenger car, particularly a release movement to reduce the clamping force between two friction mating parts, and includes a locking bolt arranged to engage with a locking member of an electromechanical service brake to lock the movement of the electromechanical service brake when the locking mechanism is in a locked state, and to release the locking member when the locking mechanism is in an unlocked state, and further includes an actuator, particularly an electromagnetic linear actuator or linear drive, for displacing the locking bolt between a locked state and an unlocked state.

[0019] According to the present invention at this time, based on an external acceleration acting on the locking mechanism, inertial forces acting on the locking bolt, on the actuator, and / or in particular on the lever mechanism designed in a mass compensation manner and coupling the actuator to the locking bolt are compensated by the effective lever lengths for the locking bolt and the effective lever length for the actuator of the lever mechanism so as to be maintained in the unlocked state regardless of the value and / or direction of the external acceleration starting from the state where the locking bolt is unlocked.

[0020] To avoid unnecessary repetition, regarding the advantages of the service brake according to the present invention and the advantages of the method according to the present invention for operating the locking mechanism, refer to the above description regarding the locking mechanism.

[0021] The components disclosed with respect to the device are considered to be disclosed with respect to the method and are claimable, and vice versa.

[0022] Other advantages, components, and details of the present invention will become apparent from the following description of the preferred embodiments of the present invention and from reference to the drawings.

Brief Description of the Drawings

[0023] [Figure 1] It is a schematic diagram showing an electromechanical service brake based on the prior art. [Figure 2a] It is a cross-sectional view showing a normal actuator of the locking mechanism. [Figure 2b] It is a cross-sectional view showing a normal actuator of the locking mechanism. [Figure 3] It is the locking mechanism of the present invention in the first embodiment. [Figure 4] It is the locking mechanism of the present invention in the second embodiment.

Modes for Carrying Out the Invention

[0024] Components that are identical or have the same function are given the same reference numeral in each drawing.

[0025] Figure 1 shows a schematic diagram of an electromechanical service brake 20 with a parking brake function based on prior art. An embodiment based on the form of a floating caliper brake is preferred. Here, the brake disc 18 and brake pad 17 act as friction mating surfaces. For the sake of simplicity in the drawing, a second brake pad is not shown. A spindle drive 13 having a spindle nut 14 and a spindle 15 is configured as a translation-rotation-transmission device, converting the rotation of the spindle nut 14 into the translational motion of the spindle 15, which causes the brake pad 17 to contact the brake disc 18 and generate braking force. The driving moment is applied to the spindle nut 14 by an electric motor 16.

[0026] To integrate the parking brake function, the electromechanical service brake 20 has a locking mechanism 21. A ratchet wheel is non-rotatably coupled to a spindle nut 14 as a locking member 02. A lock bolt 03 is coupled to the armature 11 of a linear actuator 05. When the coil 12 is energized, the armature 11 and consequently the lock bolt 03 are displaced so that the lock bolt 03 engages with the locking member 02, which is manufactured as a ratchet wheel, in a locking manner. A spring member 10 applies an initial stress to the armature 11 and the lock bolt 03, which is in the unlocked state of the locking mechanism 21, thereby displacing the armature 11 and the lock bolt 03 to an initial position where, when the coil 12 is not energized, the lock bolt 03 is positioned to release the locking member 02, which is manufactured as a ratchet wheel, and holds in that position. To prevent unintended displacement of the armature 11 and the lock bolt 03, the spring means 10 has a high spring constant.

[0027] Figures 2a and 2b illustrate an electromagnetic actuator 04, which is fabricated here as a linear actuator 05. Such a linear actuator 05 is commonly used in a locking mechanism 21 based on the prior art and in a locking mechanism 01 according to the present invention. The linear actuator 05 includes an armature 11 and a coil 12 surrounding the armature 11. The armature 11 is linearly movable between an actuated position and a deactuated position of the linear actuator 05. Here, Figure 2a shows the deactuated position. Figure 2b shows the actuated position. Due to the magnetic material of the armature 11, which has a high density, it has a high mass. When an external acceleration a acts on the linear actuator 05, a high inertial force T acts on the armature 11 due to its high mass. Thus, such an inertial force T can displace the armature 11 from the deactuated position to the actuated position of the linear actuator 05 against the spring force of the spring means 10. Therefore, it is clear that external acceleration a can cause unintended operation of the lock mechanism 01, which is coupled to or operated via the linear actuator 05.

[0028] Figure 3 shows a locking mechanism 01 according to the present invention in a first embodiment. The locking member 02 is configured as a ratchet and is non-rotatably coupled to a spindle nut (not shown) of an electromechanical service brake. When the locking mechanism 01 is in the unlocked state shown, the locking bolt 03 is disengaged, that is, the locking bolt 03 is not engaged with the locking member 02, and the locking member 02 is rotatable in both directions. The locking bolt 03 is coupled by a swinging lever 07 to an actuator 04 configured as a linear actuator 05. The locking bolt 03 is supported so as to be linearly movable, and the support portion of the locking bolt 03 allows the locking bolt 03 to move in a direction of motion D parallel to the direction of motion E of the linear actuator 05. Preferably, the support portion of the locking bolt 03 may include a buffer 09, which may be configured as, for example, a friction buffer, thereby acting a frictional force against the displacement of the locking bolt 03.

[0029] A spring mechanism 10 is configured as a component of the actuator 04, thereby spring-biasing the lock mechanism 01 in the direction of the unlocked state and applying an initial stress. The lock bolt 03, the oscillating lever 07, and the actuator 04 or the armature 11 of the actuator 04 constitute the lever mechanism 06. At this time, the oscillating lever 07 is supported so as to be rotatable about the rotation axis 08. The oscillating lever 07 has a lever length r1 with respect to the lock bolt 03. With respect to the actuator 04, the oscillating lever 07 has a lever length r2. The action of an external acceleration a generates an inertial force F1 acting on the lock bolt 03 and an inertial force F2 acting on the actuator 04. The inertial forces F1 and F2 generate moments M1 and M2 acting on the oscillating lever 07 in opposite directions with respect to the rotation axis 08. In this example, the armature 11 of actuator 04 has a greater mass than the lock bolt 03, and therefore the value of the inertial force F2 is greater than the value of the inertial force F1. The lever length r1 is greater than the lever length r2. The lever lengths r1 and r2 have a ratio of lengths such that the opposite moments M1 and M2 are equal. Therefore, moment equilibrium is achieved at the oscillating lever 07. Consequently, the lever mechanism 06 remains stationary under the action of the external acceleration a, and this does not cause displacement of the lock bolt 03.

[0030] Figure 4 shows a second embodiment of the lock mechanism 01 according to the present invention. Unlike the drawing in Figure 2, the lock bolt 03 and the linear actuator 05 are bent relative to each other at an angle b with respect to the directions of motion D and E, respectively. Here, angle b represents the angle between the directions of motion D and E of the lock bolt 03 and the linear actuator 05. An external acceleration a acts on the lock mechanism 01 in the principal direction of action H. The lock bolt 03 and the linear actuator 05 are aligned such that the angle bisector G of angle b is parallel to the principal direction of action H. Therefore, under the external acceleration a in the principal direction of action H, moment equilibrium is brought about at the oscillating lever 07 with respect to the rotation axis 08.

[0031] External acceleration in a direction of action different from the principal direction of action H may generate an effective residual moment in the oscillating lever 07 with respect to the rotation axis 08, based on an imperfect equilibrium of moments. The spring means 10 is configured such that the spring force of the spring means 10 holds the locking mechanism 01 in an unlocked state against the action of such a residual moment, thereby preventing the action of such a residual moment from leading to the displacement of the lock bolt 03 from the unlocked state to the locked state of the locking mechanism 01. [Explanation of Symbols]

[0032] 01 Locking Mechanism 02 Locking component 03 Lock bolt 04 Actuator 05 Linear Actuator 06 Lever Mechanism 07 Swivel Lever 08 Rotation axis 09 Buffer means 10 Spring mechanism a. External acceleration b angle E direction of movement D Motion direction F1,F2 Inertia force Angle bisector of G H Main direction of action M1, M2 Moments r1, r2 Lever length

Claims

1. A locking mechanism (01) for locking the movement of an electromechanical service brake, particularly a release movement that reduces the clamping force between two friction mating parts, preferably for use in an automobile, particularly in a passenger car, comprising a locking bolt (03) arranged to engage with a locking member (02) of the electromechanical service brake to lock the movement of the electromechanical service brake when the locking mechanism (01) is in a locked state, and to release the locking member (02) when the locking mechanism (01) is in an unlocked state, further comprising an actuator (04), particularly an electromagnetic linear actuator (05) or linear drive, for displacing the locking bolt (03) between a locked state and an unlocked state, A locking mechanism characterized in that the lever mechanism (06) is designed in particular to be mass-compensated, coupling the actuator (04) with the lock bolt (03), and the effective lever length (r1) of the lever mechanism (06) with respect to the lock bolt (03) and the effective lever length (r2) with respect to the actuator (04) are in a ratio such that the inertial forces (F1, F2) acting on the lock bolt (03), the actuator (04), and / or the lever mechanism (06) are compensated based on an external acceleration (a) acting on the lock mechanism (01), and the lock bolt (03) is maintained in an unlocked state regardless of the value and / or direction of the external acceleration (a), starting from the unlocked state.

2. A locking mechanism (01) for an electromechanical service brake according to claim 1, comprising a oscillating lever (07) rotatably supported about a rotation axis (08), wherein the lock bolt (03) and the actuator (04) are pivotally supported thereon on different sides with respect to the rotation axis (08), so that the inertial forces (F1, F2) acting on the lock bolt (03), the actuator (04), and the oscillating lever (07) based on the external acceleration (a) generate moments (M1, M2) in opposite directions with respect to the rotation axis (08).

3. The locking mechanism (01) for an electromechanical service brake according to claim 2, characterized in that the effective lever length (r1) of the oscillating lever (07) with respect to the lock bolt (03) and the effective lever length (r2) of the actuator (04) are in a ratio such that the opposite moments (M1, M2) generate moment equilibrium with respect to the rotation axis (08).

4. A locking mechanism (01) for an electromechanical service brake according to any one of claims 1 to 3, characterized in that it has a buffering means (09) pivotally supported on the locking bolt (03), the actuator (4), or the lever mechanism (06) for buffering the movement of the locking mechanism (01).

5. A locking mechanism (01) for an electromechanical service brake according to any one of claims 1 to 4, characterized in that it has a spring means (10) pivotally supported on the locking bolt (03), the actuator (04), or the lever mechanism (06) that applies an initial stress to the locking mechanism (01) to an unlocked state.

6. The locking mechanism (01) for an electromechanical service brake according to claim 5, characterized in that the spring means (10) has a spring force that is 1.3 times, preferably 1.2 times, and more preferably 1.1 times, the minimum mechanically required restoring force resulting from tolerance and / or friction.

7. A locking mechanism (01) for an electromechanical service brake according to any one of claims 1 to 6, characterized in that the direction of motion (D) of the locking bolt (03) for displacing the locking bolt (03) between an unlocked state and a locked state and the direction of motion (E) of the actuator (04) are arranged parallel to each other.

8. A locking mechanism (01) for an electromechanical service brake according to any one of claims 1 to 6, characterized in that the direction of motion (D) of the locking bolt (03) and the direction of motion (E) of the actuator (04) for displacing the locking bolt (03) between an unlocked state and a locked state are bent and arranged to form an angle (b) with respect to each other, and the angle bisector (G) of the angle (b) is arranged parallel to the main direction of action (H) of the external acceleration (a).

9. An electromechanical service brake, preferably for use in automobiles, particularly in passenger cars, and functioning particularly as a parking brake, comprising a locking mechanism (01) according to any one of claims 1 to 8.

10. A method for operating a locking mechanism (01) for locking the movement of an electromechanical service brake for use in an automobile, particularly a passenger car, particularly for a release movement that reduces the clamping force between two friction mating parts, the method comprising a locking bolt (03) arranged to engage with an electromechanical service brake locking member (02) to lock the movement of the electromechanical service brake when the locking mechanism (1) is in a locked state, and to release the locking member (02) when the locking mechanism (01) is in an unlocked state, and further comprising an actuator (04), particularly an electromagnetic linear actuator (05) or linear drive, for displacing the locking bolt (03) between a locked state and an unlocked state, A method characterized in that the inertial forces (F1, F2) acting on the lock bolt (03), the actuator (04), and / or a lever mechanism (06) which is particularly designed in a mass-compensated manner to couple the actuator (04) with the lock bolt (03) are compensated by the lever mechanism (06) effective lever length (r1) for the lock bolt (03) and the effective lever length (r2) for the actuator (04), so that the lock bolt (03) is kept unlocked regardless of the value and / or direction of the external acceleration (a), starting from the unlocked state.

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