Drive for a swing-leaf door and method for pivoting a door leaf of a swing-leaf door
Patent Information
- Application Number
- EP2023736746
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-07-01
- Filing Date
- 2023-07-03
- Publication Date
- 2025-03-05
- Estimated Expiration
- 2043-07-03
Smart Images
Figure 1.1
Abstract
Description
[0001] Drive for a swing door and method for pivoting a door leaf of a swing door
[0002] The invention relates to a drive unit for a swing door, wherein the drive unit comprises the following: an electric motor with a motor shaft, in particular a servo motor, for pivoting a door leaf relative to a door frame; a control / regulation unit which is designed to bring the door leaf into a desired angular position by controlling and / or regulating the electric motor; and an electrically actuated brake.
[0003] Furthermore, the invention relates to a revolving door and a method for pivoting a door leaf of a revolving door.
[0004] Electric drive units for swing doors are used to electrically open and close swing doors. To open or close, the door leaf is moved to a desired angular position with the help of the drive unit's electric motor, allowing people to pass through the swing door. However, external influences, such as drafts or unintentional force from people, can change the angular position of the door leaf.
[0005] It is known from the prior art to continuously regulate the angular position of a door leaf with the aid of an electric motor so that the door leaf remains in the desired angular position. However, this has the disadvantage that the electric motor must constantly compensate for any small differences between the desired angular position and the current angular position, which may arise due to drafts or other forces. This results in increased power consumption and additional noise pollution, especially in sensitive areas such as hospitals, nursing homes, and libraries.
[0006] It is also known from the prior art to fix a door leaf in the desired angular position by means of a brake.
[0007] This is shown, for example, in US 3,470,653 A and US 7,310,911 B1. When the desired angular position of the door leaf is reached, the brake is supplied with electrical power, thereby locking the door leaf. To hold the door leaf in the desired angular position for an extended period, a continuous power supply to the brake is necessary, which increases energy consumption.
[0008] In view of these statements, it is therefore an object of the present invention to at least partially mitigate or even completely eliminate the disadvantages of the prior art. Preferably, the object of the present invention is to hold a door leaf in a desired angular position with low energy consumption and low noise emissions.
[0009] This object is achieved by a drive unit according to claim 1, by a swing door according to claim 13 and by a method according to claim 15. Preferred embodiments are specified in the dependent claims.
[0010] According to the invention, in a drive unit of the type mentioned at the outset, the brake is designed to generate a holding brake torque, preferably by friction, in a substantially currentless state and to exert it on the door leaf in order to hold the door leaf in the desired angular position in the event of a disturbance torque acting on the door leaf, and to generate a release brake torque which is reduced in comparison to the holding brake torque and to exert this on the door leaf in a current-energized state. In this way, the door leaf can be held in the desired angular position with only very little or no current or energy consumption. The door leaf is preferably only pivoted by the electric motor when the brake is energized, since in this state the electric motor only has to work against the release brake torque of the brake, which is preferably substantially 0 Nm.In the essentially de-energized state, the brake is preferably switched completely off-current, so that no electrical current flows through the brake and no energy is consumed by the brake. At the same time, the holding brake torque is generated by the brake. In one embodiment of the invention, however, it can also be provided that in the essentially de-energized state, an electrical quiescent current flows through the brake. However, such a quiescent current is many times lower than the electrical current that flows through the brake in the energized state. For example, the quiescent current can be a few mA, for example approximately 10 mA, while the current through the brake in the energized state is in the range between 0.1 A and 10 A, preferably between 0.1 A and 1 A or between 0.1 A and 0.5 A.In the essentially de-energized state, the brake is active and counteracts any disturbing torque acting on the door leaf, which can arise, for example, from drafts or accidental contact by people, so that the door leaf can be held in the desired angular position. In contrast to the present invention, in known drive units with electrically actuated brakes, these must be energized in order to hold the door leaf in a desired angular position, which results in significantly higher current or energy consumption if these doors are to be held in a desired angular position. In the energized state, the brake according to the invention only generates the release braking torque, which is lower than the holding braking torque and preferably corresponds essentially to 0 Nm, so that the door leaf can be pivoted by the electric motor.In the case of a release braking torque of 0 Nm, the door leaf is completely released by the brake.
[0011] However, due to tolerances and friction in bearings, a friction torque other than 0 Nm may be present. It is important that the release braking torque is smaller than the holding braking torque. Holding braking torque and release braking torque are torques generated by the brake when a disturbance torque acts on the door leaf or the brake. If no disturbance torque acts, no torque is generated by the brake. The holding braking torque and release braking torque therefore counteract any rotation of the door leaf, but do not cause any rotational movement on their own. If a disturbance torque acting on the door leaf exceeds the holding braking torque or the release braking torque, the door leaf will still be rotated. The brake can be switched into the energized and essentially de-energized state by the control / regulation unit.The target angular position of the door leaf can be seen relative to the door frame, whereby the counting direction can depend on the opening direction of the swing door. In this disclosure, an angular position of the door leaf of 0° is assumed when the swing door is closed. However, the angular position of 0° can in principle be assumed arbitrarily. When the swing door is open, according to this disclosure, the door leaf is in an angular position that is not equal to 0°. The target angular position can, depending on the maximum opening width of the swing door, lie in a range from 0° to 360°. Typical swing doors have a limited opening width. In such a case, the target angular position of the door leaf is therefore, for example, in a range from 0° to 180° or from 0° to 130°. The target angular position at which the door leaf is to be positioned can be freely selectable or adjustable.A set target angular position can be stored in a memory. In one example, the target angular position can be selectable or adjustable using a switch for opening and / or closing the swing door. In one example, a target angular position of the door leaf can be set to over 90° by pressing the switch. The door leaf is held in this position by the brake in the de-energized state. By pressing the switch again, the target angular position can be set back to 0°. Of course, several target angular positions, for example 20°, 90° and 170°, can also be provided. The target angular positions can be stored in a memory of the control / regulation unit and selected, for example, using a switch.It can also be provided that a detection sensor is set up to detect people in the area in front of the swing door and subsequently adjust the target angular position accordingly so that the swing door is opened. The holding brake torque and the release brake torque can be transmitted directly or indirectly from the brake to the door leaf. For example, the brake can transmit the holding brake torque and the release brake torque to the door leaf via the motor shaft or a transmission element. The holding brake torque holds the door leaf in the target angular position until a disturbance torque acting on the door leaf exceeds the holding brake torque. The holding brake torque can therefore also be referred to as a static braking torque because it holds the door leaf at rest in the event of a disturbance torque, i.e. it compensates for the disturbance torque.The electric motor is preferably a servo motor, in particular a brushless DC motor. A brushless DC motor is characterized by low noise generation and low maintenance requirements. The rotary movement of the electric motor can be transmitted directly from the shaft to the door leaf. However, the rotary movement of the electric motor can also be transmitted indirectly to the door leaf, for example via a gear and / or a transmission element. The transmission element is preferably a slide rod that can be slidably connected to a guide rail on the door leaf.
[0012] Directional information in this disclosure refers to the intended use of the drive unit in a swing door.
[0013] The brake is preferably an electrically controlled friction brake. Such a friction brake has an electrical winding which is designed to preferably axially displace a displaceably mounted pressing element having a first friction surface. The displaceably mounted pressing element can press a rotatably mounted driver element having at least one second friction surface against a pressing part having a third friction surface, such that the driver element is clamped between the pressing part and the pressing element and the holding brake torque is generated. In the de-energized state, the displaceably mounted pressing part is pressed against the driver element by a spring preload which can preferably be adjusted by means of one or more adjusting screws, and the driver element is then pressed against the pressing part. The spring preload can be generated by an adjustable spring.The driver element can be connected to the motor shaft so that the holding brake torque can be transmitted to the motor shaft. By energizing the electrical winding, the spring force is overcome, so that the pressure element exerts no or only a minimal force on the driver element. The driver element can rotate essentially freely when the brake is energized.
[0014] Alternatively, the brake can be designed as a form-fit brake, in particular as a toothed holding brake.
[0015] In a particularly preferred embodiment, the release braking torque is substantially equal to 0 Nm, so that the door leaf is completely released from the brake when energized. This allows the door leaf to be pivoted by the brake when energized without braking resistance. The release braking torque is less than 0.05 Nm, measured at the motor shaft, preferably less than 0.03 Nm, in particular less than 0.01 Nm.
[0016] In order to be able to hold the door leaf in the desired angular position on the one hand, but also to enable the swing door to open in the event of a power failure on the other, it is advantageous if the holding brake torque is in a range of 0.06 Nm to 4 Nm, preferably from 0.07 Nm to 2 Nm or from 0.08 Nm to 1 Nm or from 0.08 Nm to 0.85 Nm. The holding brake torque is measured on the motor shaft. The holding brake torque is preferably adjustable, for example using adjusting screws.
[0017] Special standards and regulations apply to escape routes and escape doors in buildings. Escape routes and escape doors must not pose any obstacles for people in the event of a fire and must therefore be easy to open. When the power is off, the holding brake torque is present which, measured at the motor shaft, is preferably a maximum of 0.85 Nm. As already described, the holding brake torque can be adjustable, in particular by means of one or more adjusting screws that change a spring force that generates the holding brake torque. The adjustability of the holding brake torque can at least be limited, for example to a maximum of 0.85 Nm. The holding brake torque serves to hold the door leaf in one position. However, in the event of a fire or a power failure, people can overcome such a holding brake torque without excessive effort by pushing the door open.Thus, a door equipped with the drive unit according to the invention does not represent an obstacle for escaping persons.
[0018] To reduce the resistance when pivoting the door leaf, it is advantageous if the control / regulation unit is configured to switch the electrically actuated brake to the energized state when the electric motor is controlled and / or regulated to bring the door leaf into the desired angular position. Therefore, in this embodiment, before the door leaf is pivoted by the electric motor, the brake is switched to the energized state so that it only transmits the release braking torque to the door leaf, which, as described above, is preferably substantially 0 Nm.
[0019] To hold the door leaf in the desired angular position, the control / regulation unit can be configured to switch the electrically actuated brake to the essentially de-energized state when the door leaf is in the desired angular position. In this embodiment, after the door leaf has been pivoted, the brake is switched to the essentially de-energized state so that it can transmit the holding brake torque to the door leaf.
[0020] A particularly preferred design embodiment results when the brake, preferably a friction surface, in particular a friction lining, is in preferably direct contact with a driver element that is connected to the motor shaft when de-energized. For this purpose, the brake can be arranged on the electric motor or adjacent to the electric motor, for example. The driver element is connected to the motor shaft in a rotationally fixed manner and can be accommodated in a gap in the brake. The brake can brake or hold the driver element when de-energized, so that the holding brake torque is generated and transmitted via the motor shaft. In a particularly preferred embodiment, the brake is flange-mounted on a non-drive side of the electric motor. The motor shaft is also guided out of the electric motor housing on the non-drive side.The non-drive side of the electric motor is opposite a drive side, which is connected directly or indirectly, for example, via a gear and / or a transmission element, to the door leaf. The motor shaft can be guided at least partially through the brake. However, it can also be provided that the brake is arranged, in particular flange-mounted, on the drive side of the electric motor.
[0021] In order to translate the torque or the speed of the electric motor, a gearbox, in particular an angular gearbox, can be provided which is connected to the motor shaft on an input side and can be connected to a transmission element for transmitting a rotary movement to the door leaf on an output side. The gearbox is preferably arranged on the drive side of the electric motor, in particular flange-mounted. The gearbox also translates the holding brake torque using the gearbox transmission ratio. In order to cope with tight installation situations, it is advantageous if the gearbox is designed as an angular gearbox. Such an angular gearbox can have an input side and an output side which are arranged at an angle other than 0°, for example substantially 90°, to one another. Bevel gears, for example, can be arranged inside the angular gearbox to deflect the force.An input gear shaft on the input side can be connected to the motor shaft of the electric motor. An output gear shaft on the output side can be connected to the door leaf directly or indirectly via the transmission element.
[0022] To enable manual opening of the swing door in the event of a power failure, it is advantageous if the gear is non-self-locking. Preferably, the gear is neither dynamically nor statically self-locking on the output side. Because it is non-self-locking, the gear can also be driven from the output side, i.e., by pivoting the door leaf. Self-locking means that the motor or gear shaft stops immediately when the electric motor is no longer supplied with power. Self-locking occurs when the pitch angle is smaller than the friction angle.
[0023] In one embodiment, a mounting plate is provided to which the electric motor, the gearbox, and / or the brake are attached. The attachment can be achieved, for example, by screwing, riveting, gluing, or welding. The drive unit, including the mounting plate, preferably has a maximum length of 200 mm to 500 mm, a maximum width of 50 mm to 80 mm, and a maximum height of 50 mm to 90 mm.
[0024] In order to be able to detect the position of the door leaf, it is advantageous if at least one sensor, for example a Hall sensor or a rotary encoder, is provided, with which a current angular position of the door leaf can be determined. The at least one sensor can be integrated into the electric motor. Preferably, three Hall sensors are provided, which are arranged in the electric motor. However, a rotary encoder, in particular an incremental encoder, can also be provided as a sensor. The rotary encoder can detect the position of the motor shaft or, if a gear is present, a gear shaft. The current angular position of the door leaf can be determined using the known geometry of the swing door. Other variables, for example an angular velocity and / or an angular acceleration of the door leaf, can also be determined from the current position of the door leaf.
[0025] It is particularly preferred if the control / regulation unit is designed to control the door leaf into the target angular position on the basis of the current angular position. For this purpose, a control loop can be provided which uses the target angular position as a reference variable and the current angular position as a feedback measured variable. The electrical current for the electric motor can serve as the manipulated variable. The control / regulation unit can also use derived variables, for example an angular velocity and / or an angular acceleration of the door leaf.
[0026] The object formulated above is also achieved by a revolving door which has a door frame, at least one door leaf, a drive unit of the type described and a transmission element, in particular a sliding rod, for transmitting a rotary movement from the drive unit to the door leaf or the door frame. The drive unit can be arranged on or in the door frame. However, the drive unit can also be arranged on the door leaf. In this case, it is advantageous if the drive unit is arranged in a housing. The door frame is preferably made of metal, plastic and / or wood. The door leaf can be hinged to the door frame. The door leaf is also preferably made of metal, plastic and / or wood. In one embodiment, the door leaf can be pivoted by at least 100° relative to the door frame.
[0027] To reduce noise pollution and for aesthetic reasons, it is preferred if the drive unit is accommodated essentially entirely within a receiving space in the door frame. Thus, the electric motor, the brake, and the control / regulation unit, as well as, if present, the gear unit, can be arranged in the receiving space. If a mounting plate is present, an opening in the receiving space can be adapted to the shape of the mounting plate, so that the mounting plate can close an insertion opening in the receiving space when the drive unit is inserted.
[0028] However, it can also be provided that the drive unit is mounted on the door leaf and transmits the power to the door frame via the transmission element, thus setting the door leaf in motion. As already mentioned, in this case, it is advantageous if the drive unit is housed in a housing.
[0029] The above-stated problem is also solved by a method for pivoting a door leaf of a swing door relative to a door frame. The method comprises the following steps:
[0030] Switching an electrically actuated brake into an energized state in which the brake is designed to generate a release braking torque that is reduced compared to a holding braking torque and to exert it on the door leaf;
[0031] Controlling and / or regulating an electric motor to bring the door leaf into a desired angular position;
[0032] Switching the brake into a substantially currentless state, in which the brake is designed to frictionally generate the holding brake torque and to exert it on the door leaf in order to hold the door leaf in the desired angular position in the event of a disturbance torque acting on the door leaf.
[0033] In order to bring the door leaf into a desired angular position, the steps can be carried out in the specified order. The steps are preferably carried out one after the other so that there is no overlap between the individual steps. While the electric motor is being controlled and / or regulated in order to bring the door leaf into a desired angular position, the brake can be switched to the energized state so that the brake can only exert the release braking torque, which is preferably 0 Nm, on the door leaf. Once the door leaf has been brought into the desired angular position by the electric motor, the brake is transferred to the essentially de-energized state in order to fix the door leaf. In the de-energized state, the brake can apply the holding braking torque in order to counteract undesired pivoting of the door leaf. Consequently, the electric motor no longer needs to be controlled and / or regulated in order to hold the door leaf in the desired angular position.For opening, for example, a target angular position of 60° to 120° can be specified. For closing, a target angular position of 0° can be specified. The control / regulation unit can specify the execution of the individual steps. The brake can be activated and / or deactivated by the control / regulation unit.
[0034] In the following, the invention is described with reference to figures, to which it is not intended, however, to be limited.
[0035] It shows :
[0036] Fig. 1 shows an open swing door in a front view;
[0037] Fig. 2 shows a section of a swing door with a drive unit in a door frame in a view from above;
[0038] Fig. 3 shows a further section of an opened swing door in a view from below;
[0039] Fig. 4 is a front view of a drive unit in a door frame, with the door frame cut open;
[0040] Fig. 5 shows a cutaway door frame with a drive unit in a side view;
[0041] Fig. 6 shows a door frame with a drive unit in plan view;
[0042] Fig. 7 is a partially exploded view of a drive unit on a swing door;
[0043] Fig. 8 shows the process steps for pivoting a door leaf; Fig. 9A shows a friction brake in cross section;
[0044] Fig. 9B a spring of the friction brake;
[0045] Fig . 9C the friction brake from the front ; and
[0046] Fig. 9D is a schematic exploded view of the friction brake.
[0047] Fig. 1 shows a free-standing revolving door 1 in the non-installed state with a door frame 2 and a door leaf 3 which is pivotally connected to the door frame 2 via two door hinges 4. The door frame 2 can also be referred to as a casing. Fig. 1 shows schematically that the revolving door 1 has a drive unit 5 which is arranged essentially completely within the door frame 2 and with which the door leaf 3 can be brought into a desired angular position cg or «2 for opening and closing. The drive unit 5 is arranged in a receiving space 13 of the door frame 2. The desired angular position ai represents a closed state of the revolving door 1 and corresponds to 0 °. The desired angular position «2 corresponds to an open state of the revolving door 1 and can be 100 °, for example. The desired angular positions cg and «2 can be stored in a memory (not shown).By pressing a switch 50, for example, cg or «2 can be selected as the target angular position, thereby opening or closing the swing door 1. Of course, other target angular positions can also be provided. «torque denotes a momentary angular position of the door leaf. Mstör denotes a disturbance torque acting on the door leaf 3. The disturbance torque M. S Door can be caused, for example, by drafts or other forces.
[0048] Fig. 2 shows a section of the swing door 1 with the drive unit 5 in the door frame 2 in an oblique view from above. The drive unit 5 has an electric motor 6, in particular a brushless DC motor serving as a servo motor 6a, a brake 7, a control / regulation unit 9 and a gear 10. The electric motor 6 can, for example, have three phases / external conductors and can be controlled and / or regulated accordingly by the control / regulation unit 9. A transmission element 8 is provided to transmit the rotary movement of the electric motor 6. The brake 7 is flange-mounted on the rear side of the electric motor 6, which can also be referred to as the non-drive side of the electric motor 6. The brake 7 can frictionally apply a holding brake torque M to the motor shaft 51, which will be described in more detail later. Haite (see Fig. 4). The motor shaft 51 is guided at least partially into the brake 7. In the illustration shown, the motor shaft 51 is guided through the brake 7. However, the motor shaft 51 can also end within the brake 7. The drive unit 5 with mounting plate 17 has, in the illustration shown, a length of 330 mm, a width of 66 mm and a height of 89 mm.
[0049] The transmission element 8 is formed in the illustration shown by a sliding rod 8a. The sliding rod 8a is connected at one end to an output gear shaft (not shown) of the gear 10 in a rotationally secure manner and is mounted at the other end in a sliding rail 11 which is arranged on an upper end face of the door leaf 3 and can be moved linearly. To guide the sliding rod 8a in the sliding rail 11, the sliding rod 8a has a sliding element 12, in particular a sliding block 12a, on the end facing the sliding rail 11, which can slide along the sliding rail 11. The sliding element 12 is rotatably mounted on the end of the sliding rod 8a facing the sliding rail 11. The door leaf 3 can be opened or closed by turning the sliding rod 8a.
[0050] The drive unit 5 is arranged completely within a receiving space 13 in the door frame 2, so that the electric motor 6, the brake 7, the control / regulating unit 9 and the gear 10 are not visible from the outside when the swing door 1 is installed. This can be clearly seen in Fig. 3, in which the open swing door 1 is shown in an oblique view from below. The receiving space 13 is located between two end faces 14 of the door frame 2. By arranging the electric motor 6, the brake 7 and the gear 10 within the door frame 2, audible noise is advantageously reduced and the appearance of the swing door 1 is made more appealing. In Fig. 4, the drive unit 5 is shown in a view from the front. The door frame 2 is shown in section. In the embodiment shown, the gear 10 is designed as an angular gear 10a.Angular gears are known from the prior art and their mode of operation will not be described in detail here. The gear 10 is preferably non-self-locking. The angular gear 10a has an input side 15 with an input gear shaft (not shown) and an output side 16 with an output gear shaft (not shown). The input side 15 or the input gear shaft and the output side 16 or the output gear shaft are arranged at an angle of approximately 90° to one another. The input gear shaft is connected to the motor shaft 51 of the electric motor 6. The output gear shaft is connected to the transmission element 8. The angular gear 10a converts a rotary movement about a horizontal axis of the motor shaft 51 into a vertical axis of the output gear shaft. This allows the electric motor to be arranged horizontally, so that the overall height of the swing door arrangement is reduced.
[0051] According to the invention, the drive unit 5 has a brake 7. The brake 7 is designed to generate, in a substantially currentless state, preferably frictionally, a holding brake torque M Ha ite to the door leaf 3 in order to hold the door leaf in a desired angular position cg, «2 when a disturbance torque Mstör acts on the door leaf 3. Furthermore, the brake 7 is designed to, in an energized state, a compared to the holding brake torque M Ha ite reduced release braking torque M F rei to the door leaf 3. The holding brake torque M Ha ite and the release braking torque M Frei are illustrated in Fig. 4. The holding brake torque M Ha ite can be, for example, 0.8 Nm, measured at the motor shaft 51. The release braking torque M Frei is preferably 0 Nm, so that the brake 7 releases the door leaf 3 in the energized state. Due to the holding brake torque M HaThis makes it possible to hold the door leaf 3 in the desired angular position cg, «2 without the electric motor 6 detecting deviations due to possible disturbing torques M S tor from the target angular position cg, «2 must compensate. Advantageously, the brake 7 transmits the compared to the release braking torque M Frei higher holding brake torque M Ha ite in the essentially currentless state, so that the energy consumption of the drive unit 5 is low.
[0052] The holding brake torque M Ha ite is only applied by the brake 7 when a disturbance torque M Sdoor acts on the door leaf 3 and is preferably created by frictional engagement. In the essentially currentless state, the brake 7 is preferably completely de-energized. In one embodiment, however, it can also be provided that in the essentially currentless state, a quiescent current flows through the brake 7, which, however, is significantly lower than the current flowing through the brake 7 in the energized state.
[0053] In order to bring the door leaf 3 into the desired angular position cg, «2, the control / regulation unit 9 can be configured to regulate the door leaf 3 into the desired angular position cg, «2 based on the current angular position «moment. The current angular position «moment of the door leaf 3 can be detected by means of a sensor (not shown), for example one or more Hall sensors in the electric motor or a rotary encoder on the motor shaft 51.
[0054] Fig. 8 shows the process steps for pivoting the door leaf 3. To pivot the door leaf 3, the brake 7 can first be switched to the energized state (step 101). In the energized state, the brake 7 only exerts the release braking torque M Frei and thereby releases the door leaf 3. Next, the door leaf 3 can be brought into the desired angular position «i, «2 by appropriate control and / or regulation (step 102). When the door leaf 3 is in the desired angular position «i, «2, the control and / or regulation can be deactivated and the brake 7 can be switched to the essentially currentless state (step 103).
[0055] In Fig. 7, the drive unit 5 is shown partially in an exploded view. In Fig. 7, a mounting plate 17 can be seen, to which parts of the drive unit 5 can be fastened. In particular, the gear unit 10 can be connected to the mounting plate 17, in particular screwed, riveted, glued or welded. In the exemplary embodiment shown, the mounting plate 17 has four screw through-holes 18 for the passage of screws 19, with which the gear unit 10 can be fastened to the mounting plate 17. The electric motor 6 is flange-mounted to the gear unit 10 on the drive side, and the brake 7 is in turn mounted to the opposite non-drive side. The screws 19 thus also fasten the electric motor 6 and the brake 7 indirectly to the mounting plate 17 via the gear unit 10.The mounting plate 17 furthermore has a through-hole 20 for the passage of the transmission output shaft or a connecting part (not shown) connected thereto, which can be connected to the transmission element 8. Fastening blocks 21 can be provided for fixing the mounting plate 17 to the door frame 2. The fastening blocks 21 can be screwed or riveted to the door frame 2 and to the mounting plate 17. The mounting plate 17 furthermore has an elongated recess 22 for at least partially accommodating the electric motor 6 and the brake 7 in order to reduce the structural volume and enable stable mounting.
[0056] In the illustrated embodiment, the drive unit 5 with mounting plate 17 has a length of 330 mm, a width of 66 mm, and a height of 89 mm. The drive unit 5 is designed to pivot a 180 kg door leaf 3 by 120° within 5 seconds.
[0057] Fig. 9A shows a brake 7 in the form of a friction brake 23 in a de-energized state. The friction brake 23 has a winding 24 from which wires 25 lead. The winding 24 can be energized with the help of the wires 25. The winding 24 is seated in a stator housing 26. The friction brake 23 can in particular be flange-mounted on the non-drive side of the electric motor 6. The motor shaft 51 (not shown) of the electric motor 6 can be guided through the friction brake 23. The motor shaft 51 can be connected in a rotationally fixed manner, preferably by form-fitting, to a driver element 28 through an opening 27. The driver element 28 can be arranged so as to be axially displaceable on the motor shaft 51. The driver element 28 forms a brake flange 29 which is arranged in a gap 30 of the brake 7. The friction brake 23 has an axially displaceable pressure element 31 which, in the de-energized state, presses the driver element 28 due to a spring force (see Fig.9B ) presses against a pressing part 32 of the friction brake 23 . An air gap 60 lies between the winding 24 and the pressing element 31 in the de-energized state. The pressing part 32 is part of the stator housing 26 or, just like the pressing element 31, is connected to it. The pressing element 31, the driver element 28 and the pressing part 32 each have friction surfaces which are in contact when the current is de-energized. Friction surfaces refer to surfaces which are in contact during braking. The friction surfaces can be formed by friction linings 33, as is the case in the illustration shown. The friction surfaces on the driver element 28 are arranged on both sides. In order to make the braking process quieter, the brake flange 29 can be made of plastic. Such a brake flange 29 does not require any friction linings 33.
[0058] When the winding 24 is energized, the pressing element 31 is pulled towards the winding 24 due to the resulting magnetic force against the spring force (see Fig. 9B), so that the air gap 60 is closed and a gap is created between the pressing element 31 and the driver element 28. Since the driver element 28 is axially displaceable on the motor shaft 51, it can also detach from the pressing part 32 and then rotate. In the energized state, the driver element 28 is released, so that only the release braking torque M Fre i, which is preferably substantially 0 Nm, is applied by the friction brake 23.
[0059] Fig. 9B shows a spring 34 in a recess 35, which presses the pressure element 31 against the driver element 28 when de-energized. The preload of the spring 34 can be adjusted using an adjusting screw 36. Several such springs 34 are preferably arranged along the circumference of the pressure element 31. This can be seen in Fig. 9C, which shows a front side of the brake 7. The opening 27 of the driver element 28 can be seen. The motor shaft 51 (not shown) can be connected to the driver element 28 by means of a positive connection 37.
Claims
Patent claims:
1. Drive unit (5) for a swing door (1), comprising: an electric motor (6), in particular a servo motor (6a), with a motor shaft (51) for pivoting a door leaf (3) relative to a door frame (2); a control / regulation unit (9) which is designed to bring the door leaf (3) into a desired angular position (cg, «2) by controlling and / or regulating the electric motor (6); and an electrically actuated brake (7), characterized in that the brake (7) is designed to generate a holding brake torque (M Ha ite) and exert it on the door leaf (3) in order to compensate for a disturbance torque (M S tör) to hold the door leaf (3) in the desired angular position (cg, «2), and in an energized state a compared to the holding brake torque (M Ha ite) reduced release braking torque (M Frei) to generate and exert on the door leaf (3).
2. Drive unit (5) according to claim 1, characterized in that the release braking torque (M Fre i) substantially corresponds to 0 Nm, so that the door leaf (3) is completely released from the brake (7) when energized.
3. Drive unit (5) according to claim 1 or 2, characterized in that the holding brake torque (M Ha ite) is in a range from 0.06 Nm to 4 Nm, preferably from 0.07 Nm to 2 Nm or from 0.08 Nm to 1 Nm or from 0.08 Nm to 0.85 Nm.
4. Drive unit (5) according to one of claims 1 to 3, characterized in that the brake (7) is a friction brake (23) or a form-lock brake, in particular a toothed brake.
5. Drive unit (5) according to one of claims 1 to 4, characterized in that the control / regulation unit (9) is designed to switch the electrically actuated brake (7) into the energized state when the electric motor (6) is controlled and / or regulated in order to bring the door leaf (3) into the desired angular position (cg, «2).
6. Drive unit (5) according to one of claims 1 to 5, characterized in that the control / regulation unit (9) is designed to switch the electrically actuated brake (7) to the currentless state when the door leaf (3) is in the desired angular position (cg, «2).
7. Drive unit (5) according to one of claims 1 to 6, characterized in that the brake (7), preferably a friction surface, in particular a friction lining, is in direct contact, preferably in the currentless state, with a driver element (28) which is connected to the motor shaft (51).
8. Drive unit (5) according to one of claims 1 to 7, characterized in that a gear (10), in particular an angular gear (10a), is provided, which is connected to the motor shaft (51) on an input side (15) and on an output side (16) can be connected to a transmission element (8) for transmitting a rotary movement to the door leaf (3).
9. Drive unit (5) according to claim 8, characterized in that the gear (1) is not self-locking.
10. Drive unit (5) according to one of claims 8 or 9, characterized in that a mounting plate (17) is provided to which the electric motor (6), the transmission (10) and / or the brake (7) is fastened.
11. Drive unit (5) according to one of claims 1 to 10, characterized in that at least one sensor, for example a Hall sensor or a rotary encoder, is provided with which a current angular position («moment) of the door leaf (3) can be determined.
12. Drive unit (5) according to claim 11, characterized in that the control / regulation unit (9) is designed to regulate the door leaf (3) on the basis of the instantaneous angular position («moment) into the S o 11 -angular position (eg, eg).
13. Swing door (1), comprising: a door frame (2), at least one door leaf (3), a drive unit (5) and a transmission element (8), in particular a sliding rod (8a), for transmitting a rotary movement from the drive unit (5) to the door leaf or the door frame, characterized in that the drive unit (5) is designed according to one of claims 1 to 12.
14. Swing door (1) according to claim 13, characterized in that the drive unit is substantially completely accommodated in a receiving space (13) of the door frame (2).
15. Method for pivoting a door leaf (3) of a swing door (1) relative to a door frame (2) with the following steps: Switching an electrically actuated brake (7) into an energized state in which the brake (7) has a braking torque (M Ha ite) reduced release braking torque (M Fre i) generates and exerts on the door leaf; Controlling and / or regulating an electric motor (6) in order to bring the door leaf (3) into a desired angular position (cg, «2); Switching the brake (7) into a substantially currentless state, in which the brake (7) preferably frictionally applies the holding brake torque (M Haite) and exerts it on the door leaf (3) in order to hold the door leaf (3) in the event of a disturbance torque (M S tör) in the desired angular position («i, «2).