EP-4735309-A1 - ELECTROMECHANICAL BRAKE, BRAKING METHOD, AND USE THEREOF

EP4735309A1EP 4735309 A1EP4735309 A1EP 4735309A1EP-4735309-A1

Abstract

The invention relates to an electromechanical brake comprising an electric motor (1) which drives a spindle (3) that has a rotational profile (2) so as to advance the brake. The invention is characterized in that the brake is designed such that while the brake is being advanced, the spindle (3), which interacts with a pin element (5) under the effect of a spring force (F) that advances the brake, said pin element being connected via a force transmission element (4) and pressing against the rotational profile (2) of the spindle (3), and the rotational profile (2) of which has an incline (6), is rotated such that the pin element (5) is guided over the incline (6) such that an axial movement of the rotational element (4) is produced which interacts with a brake lining (7) such that the brake lining (7) is also axially moved so as to advance the brake.

Inventors

STURM, Sebastian
MARQUARD, Thimo
HAARMANN, Hannes
BUTENHOLZ, Hans-Christian

Assignees

Atek Drive Solutions GmbH

Dates

Publication Date: 20260506
Application Date: 20240627

Claims (1)

Patent claims Electromechanical brake, characterized: a.)with an electric motor (1) which drives a spindle (3) having a rotation profile (2) to apply the brake, the brake being designed in such a way that when the brake is applied, the spindle (3), whose rotation profile (2) has a slope (6), is rotated, the spindle (3) interacting with at least one force transmission element (4) which is subject to a spring force of a spring element (F) which applies the brake and which has a bolt element (5), so that the bolt element (5) is guided over the slope (6), so that an axial movement of the force transmission element (4) is brought about, which interacts with a brake pad (7), so that the brake pad (7) is also moved axially to apply the brake; or b.)with an electric motor (1) which drives a spindle (3) having a bolt element (5) to apply the brake, the brake being designed such that when the brake is applied the spindle (3) is rotated, the spindle (3) interacting with at least one force transmission element (4) which is subject to a spring force of a spring element (F) which applies the brake and has a rotation profile (2), the rotation profile (2) of which has a slope (6) so that the bolt element (5) is guided over the slope (6) so that an axial movement of the force transmission element (4) is brought about, which interacts with a brake pad (7) so that the brake pad (7) is also moved axially to apply the brake. Brake according to claim 1, characterized in that according to Variant a.) the spindle (3) has at least two rotation profiles (2) spaced apart from one another along its longitudinal axial extent or according to variant b.) the force transmission element (4) has at least two rotation profiles (2) spaced apart from one another along its longitudinal axial extent. Brake according to one of claims 1 to 2, characterized in that the force transmission element (4) interacts with the brake pad (7) by means of an automatic adjustment device (8). Brake according to claim 3, characterized in that the Brake is designed in such a way that according to variant a.) by means of position detection during operation a predefined position (P) between a bolt element (5) pressing on the rotation profile (2) of the spindle (3) and the rotation profile (2) of the spindle (3) is maintained or according to variant b.) by means of position detection during operation a predefined position (P) between a bolt element (5) pressing on the rotation profile (2) of the force transmission element (4) and the rotation profile (2) of the force transmission element (4) is maintained. Brake according to claim 4, characterized in that the Position detection is accomplished by moving the bolt element (5) against the slope (6) of the rotary profile (2) via the electric motor (1), so that at the point on the slope (6) at which the bolt element (5) has moved against the slope (6), the position of the bolt element (5) in relation to the slope (6) is detected by the resulting increased current consumption of the electric motor (1). Brake according to claim 4, characterized in that the Position detection is accomplished by means of a rotary encoder in such a way that the rotary encoder mounted on the electric motor (1) clearly determines the angular position of the electric motor (1) in every position and by fixing the force transmission element (4) in its rotational movement and by the rigid connection of the electric motor (1) to the spindle (3), the position of the spindle (3) relative to the bolt element (5) is clearly determined. Brake according to one of claims 1 to 6, characterized in that it is designed in such a way that according to variant a.) in a first operating mode when the spindle (3) is rotated at a certain rotational speed in one direction by means of the rotation profile (2) of the spindle (3), an axial relative movement of the bolt element (5) along the rotational profile (2) of the spindle (3) is realized, wherein the speed of the axial feed of the brake pad (7) interacting with the bolt element (5) is lower in comparison to the speed of the axial feed of the brake pad (7) interacting with the bolt element (5) when the spindle (3) is rotated in the opposite direction with the same rotational speed of the spindle (3) in a second operating mode, so that when the spindle (3) is rotated in the opposite direction, the bolt element (5) is guided over the slope (6) at a correspondingly higher speed of the axial feed of the brake pad (7) interacting with the bolt element (5), or according to variant b.) in a first operating mode When the spindle (3) is rotated at a certain rotational speed in one direction, the rotation profile (2) of the force transmission element (4) causes an axial relative movement of the bolt element (5) along the Rotation profile (2) of the force transmission element (4) is realized, wherein the speed of the axial feed of the brake pad (7) interacting with the bolt element (5) is lower in comparison to the speed of the axial feed of the brake pad (7) interacting with the bolt element (5) when the spindle (3) rotates in the opposite direction with the same rotation speed of the spindle (3) in a second operating mode, so that when the spindle (3) rotates in the opposite direction the bolt element (5) is guided over the slope (6) at a correspondingly higher speed of the axial feed of the brake pad (7) interacting with the bolt element (5). Brake according to claim 7, characterized in that it is designed in such a way that when the electric motor (1) is disconnected from the power, the brake is in the second operating mode if the bolt element (5) is in the predefined position (P) at the time the electric motor (1) is disconnected from the power. Brake according to one of claims 1 to 8, characterized in that the axial gradient of the slope (6) is at least partially at least 50, 55, 60, 65, 70, 75, 80, 85 or 90 degrees. .) Braking method, characterized in that a Brake according to one of claims 1 to 9 is used. .) Use of a slope (6) shown in one of claims 1 to 9 in a rotation profile (2) of a brake according to one of claims 1 to 9.

Description

Electromechanical brake, braking method and use The invention relates to an electromechanical brake, a braking method and a use. A large number of electromechanical brakes are known from the state of the art, which in many cases have an electric motor that drives a rotating screw drive with a spindle with a rotation profile to apply the brake. A distinction is made between service brakes with controlled application force and emergency and holding brakes with a predetermined application force, for example for the de-energized state. For emergency and holding brakes, a pre-tensioned spring assembly is often used for the application in the de-energized state. The emergency brake is held open against the force of an applying spring assembly, for example by electromagnets. For larger emergency brakes with high application forces, there are limitations in scaling due to the holding forces to be handled. When such brakes designed as service brakes are closed in an emergency, the masses of the brake components involved must be moved over the usually flatly rising rotation profile of the spindle, which takes a certain amount of time due to the system. The problem at hand is therefore that, in certain emergency situations, the times required may be too long to avoid major damage to the devices to be braked. The present invention is based on the object of designing a brake which, on the one hand, enables the controlled braking and release of rotating masses in the function of a service and holding brake and, on the other hand, serves or can serve as a fast-reacting emergency brake when opened. This object is achieved by an electromechanical brake according to the invention according to claim 1, a method according to claim 10 and a use according to claim 11. The electromechanical brake according to the invention is one which is characterized: a.)with an electric motor which drives a spindle having a rotation profile to apply the brake, wherein the brake is designed in such a way that when the brake is applied, the spindle, whose rotation profile has a slope, is rotated, wherein the spindle interacts with at least one spring force of a spring element, which has a bolt element, so that the bolt element is guided over the slope, so that an axial movement of the force transmission element is achieved, which interacts with a brake pad, so that the brake pad is also moved axially to apply the brake; or b.)with an electric motor, which drives a spindle having a bolt element to apply the brake, wherein the brake is designed in such a way that when the brake is applied, the spindle is rotated, wherein the spindle interacts with at least one spring element which is subject to a spring force applying the brake, a A force transmission element having a rotational profile, the rotational profile of which has a slope, so that the bolt element is guided over the slope, so that an axial movement of the force transmission element is accomplished, which interacts with a brake pad, so that the brake pad is also moved axially, applying the brake. Due to the slope, which has a very high longitudinal axial component in the radial course - with a continuous or non-continuous course - an axial feed of the brake can be achieved via a small rotary movement of the spindle, with correspondingly very short and generally shorter feed closing times compared to conventional electromechanical brakes. The use of the electromechanical service brake according to the invention with an emergency function that closes the brake quickly can be achieved by moving the force-transmitting bolts against the spring force in the contour of the brake that forms the spindle pitch in the open state to a starting point that is immediately behind the maximum of the spindle pitch of the service brake function and is held there by the function of the small, motor-side, electromagnetic brake that is then closed when the power is supplied. There, a second contour begins in the spindle that leads to a much larger pitch, the slope, of the rotary spindle contour and, when the power is interrupted, the forces of the brake spring that is thus compressed to the maximum force the brake to be applied much more quickly. The stopping point is selected in such a way that the high spring forces of the brake always use the second, much steeper profile of the spindle contour, the slope, while at the same time requiring low holding forces from the much smaller, also spring-loaded motor brake that opens when the power is interrupted. A brake designed in this way is suitable wherever either both functions (service brake and safety brake) or only the safety brake n are required to slow down masses from a movement or to keep them at a standstill. Even if the brake is only used as a safety brake, the guide contour 1, which is designed with a slight gradient, is used to tension the usually strong spring assembly when the machine to be braked is started up and is the prerequisite for optimizing