Automatic drive for a revolving door and revolving door

Abstract

The invention relates to an automatic drive 1 for a revolving door, in particular for a smoke and / or fire protection door. The automatic drive 1 comprises an electric drive unit 3, which is configured to actively pivot the revolving door from its closed position to its open position and / or to hold it in its open position when installed; a gearbox 5, which couples the electric drive unit 3 to a rotatably mounted output shaft 7 of the automatic drive 1; and a reset device 9 with a non-electrical energy storage device 51. The reset device 9 is configured to actuate the revolving door in the direction of its closed position when installed. The non-electrical energy storage device 51 is coupled to the output shaft 7 via a component 49 movable perpendicular to the axis of rotation A of the output shaft 7, and the movable component 49 is mounted on a roller bearing.Furthermore, the present invention relates to a revolving door with such an automatic drive 1.

Description

[0001] The present invention relates to an automatic drive for a revolving door and a revolving door with such an automatic drive.

[0002] Automatic operators for revolving doors, especially smoke and fire doors, typically have a reset mechanism with an energy storage device to reliably close the door even in the event of a power failure. When the door is opened, the energy storage device (usually in the form of a coil spring) is charged to provide the energy needed to subsequently close the door. Such reset mechanisms must be particularly reliable to ensure the door closes at all times—even in the event of a power failure. To achieve this, the movement of the reset mechanism's components must be particularly low-friction.

[0003] The document DE 10 2014 207 217 B3 relates to a revolving door drive, comprising a housing, a closer element rotatably mounted in the housing and coupled to a door leaf or a frame, a motor, in particular an electric motor, for driving the closer element, and a displaceable transmission element for transmitting a drive force from the motor to the closer element. The transmission element has a first toothed section and a separate second toothed section, and a first gearwheel drivingly connected to the motor meshes with the first toothed section, and a second gearwheel drivingly connected to the closer element meshes with the second toothed section. The transmission element is designed as a flat toothed bar.

[0004] The document DE 10 2007 002 650 A1 relates to a swing door actuator having a closer section. The closer section comprises an output shaft on which a cam plate is mounted in a rotationally fixed manner, as well as a pressure roller. A closer spring presses the pressure roller against a run-off surface of the cam plate by means of an operative connection. The pressure roller is arranged with respect to an axial center of the output shaft such that the pressure roller is moved along a path when a swing door coupled to the output shaft is opened or closed. Because the path runs past the axial center of the output shaft and due to the design of the run-off surface of the cam plate, a very similar or identical torque is applied to the output shaft for a given opening angle of the swing door in different operating modes of the swing door actuator.The rotary wing drive also has a drive motor that is operatively connected to the output shaft.

[0005] The document DE 10 2015 202 830 B3 relates to a door drive, in particular a revolving door drive, comprising a housing, an output shaft rotatably mounted in the housing and coupled to a door leaf or a frame, a motor for driving the output shaft, and a spring unit that is tensioned during a respective opening movement of the door leaf and released during a respective closing movement of the door leaf to provide a closing torque. The output shaft is driven by the motor via a rack, which, on the one hand, can be actuated by the motor via a multi-stage gear and, on the other hand, meshes with a toothing of the output shaft.

[0006] The document US 2015 / 0 114 176 A1 relates to a rotary drive for a leaf, in particular a door, a window or the like.

[0007] The document DE 10 2022 200 954 A1 relates to a drive for a door or a window, comprising a housing, a rotatably mounted on the housing

[0008] Output shaft with a cam disc, an electric motor with a gear for driving the output shaft from a closed position in an opening direction to open the door or window, a roller that rolls on the rotating cam disc during operation, a pivot lever that is pivotally connected to the housing about a pivot axis, the roller being rotatably mounted on the pivot lever, and an energy storage unit for driving the output shaft from an open position in a closing direction to close the door or window, the energy storage unit comprising an energy storage device having a longitudinal axis and a movable first abutment facing the roller, as well as a second abutment facing away from the roller, on which the energy storage device is supported, the roller transmitting force between the cam disc and the movable first abutment of the energy storage unit.wherein the cam disc and the energy storage unit are arranged on opposite sides with respect to the pivot lever, and wherein the movable first abutment of the energy storage unit is rotatably and non-displaceably coupled to the pivot lever at a coupling point and is thereby guided by the pivot lever on a circular path.

[0009] The document DE 10 2020 125 098 A1 relates to a method for pivoting a leaf, in particular a door leaf or a window leaf, from a closed position at an opening angle of 0° to an open position at an opening angle greater than 0° and / or from the open position at the opening angle greater than 0° to the closed position at the opening angle of 0° by means of a leaf torque, wherein the leaf torque comprises a manual torque, in particular generated by a person, and a drive torque, wherein the drive torque is generated by means of a drive device with a drive module, a closer module and a control module, wherein the drive module comprises an electrical machine comprising one, in particular a single, stator and one, in particular a single, rotor, wherein the closer module has an energy storage device, in particular a mechanical one,The control module comprises a control device, wherein the drive torque comprises a machine torque generated directly or indirectly by the electric machine and a closing torque generated by the closing module. The machine torque is greater than 0 Nm at at least one of the opening angles greater than 0°. Furthermore, a drive device is provided for carrying out the method.

[0010] Against this background, it is an object of the present invention to provide an automatic drive for a revolving door which has a particularly efficient and reliable return device.

[0011] This object is achieved by an automatic drive for a revolving door having the features of claim 1. Advantageous further developments for such an automatic drive can be found in the dependent claims.

[0012] According to the present invention, an automatic drive for a revolving door, in particular for a smoke and / or fire door, comprises an electric drive unit which, in the assembled state, is designed to actively pivot the revolving door from its closed position to its open position and / or to hold it in its open position, a gear which couples the electric drive unit to a rotatably mounted output shaft of the automatic drive, and a return device with a non-electrical energy store. The return device is designed, in the assembled state, to urge the revolving door towards its closed position. The non-electrical energy store is coupled to the output shaft via a component which is movable perpendicular to the axis of rotation of the output shaft. The movable component is mounted on roller bearings.The movable component is supported by at least one roller-mounted roller, in particular by at least two and preferably by at least three roller-mounted rollers. The roller-mounted roller for supporting the movable component has a radially encircling running surface, which is shaped opposite to and bears against a corresponding axially extending running surface of the movable component. This enables particularly reliable guidance of the movable component. The running surface of the movable component transversely, in particular perpendicularly, to the axial direction of movement of the movable component is convexly shaped. The corresponding running surface of the roller-mounted roller for supporting the movable component transversely, in particular perpendicularly, to the axial direction of movement of the movable component is concavely shaped.

[0013] Such a design is particularly reliable and robust. In particular, a rolling bearing has the advantage of being more efficient than a plain bearing, as there is less friction. Compared to oil- or grease-lubricated plain bearings, a rolling bearing is also less prone to failure over extended periods of operation.

[0014] The movable component is preferably designed as a piston. This piston is mounted for axial movement, particularly with play, along a bore within a corresponding piston housing of the automatic drive. This design makes it possible to use parts from conventional door closers in an automatic drive to create a corresponding reset device. Door closer parts are manufactured in larger quantities and are therefore less expensive than parts specifically developed for automatic drives.

[0015] Furthermore, the non-electrical energy storage device is preferably provided at least partially, in particular completely, within the bore of the piston housing. This configuration results in reliable fixation and guidance of the energy storage device components.

[0016] The non-electrical energy storage device is preferably a mechanical energy storage device. In particular, it is designed in the form of an axially acting helical spring acting on the movable component. Such a design is particularly robust and reliable.

[0017] Preferably, the movable component has an axially extending rack section that is in permanent engagement with a pinion of the output shaft. Such a rack section enables a particularly reliable and robust coupling of the translational movement of the movable component with the rotational movement of the output shaft.

[0018] Preferably, the rack section of the movable component is mounted transversely to the axial direction of movement of the movable component between the pinion of the output shaft and the roller bearings. This enables a particularly robust yet compact design.

[0019] Preferably, the roller axes of the roller bearings are aligned transversely, in particular perpendicularly, to the axial direction of movement of the movable component and / or parallel to each other. Such a configuration is comparatively simple to implement and particularly stable.

[0020] Preferably, the roller-bearing rollers are spaced apart from one another in the axial direction of movement of the movable component, and in particular, are arranged in a common plane. Such a design is particularly compact and robust.

[0021] Preferably, the rollers mounted on roller bearings for supporting the movable component are each rigidly connected to a gear housing of the automatic drive in a translationally rigid manner. Alternatively or additionally, the rollers mounted on roller bearings for supporting the movable component are each fixed via a needle bearing sleeve and a corresponding cylindrical pin. This type of design is particularly robust and reliable.

[0022] The electric drive unit preferably comprises an electric motor, in particular in the form of a currentless magnetic electric motor, whose motor axis is aligned particularly transversely, preferably perpendicularly, to the axial direction of movement of the movable component. Such a configuration is particularly reliable and low-wear. Alternatively or additionally, the electric motor is preferably designed to act as a generator when the revolving door pivots toward its closed position, in order to dampen the closing movement of the revolving door. Therefore, no hydraulic fluid is required for the damping effect of the automatic drive.

[0023] Preferably, the transmission is designed as a multi-stage transmission, with the first stage being a toothed belt or spur gear stage. Such a design is particularly efficient, yet compact, compared to the use of a worm gear.

[0024] According to the invention, a revolving door, in particular a smoke and / or fire door, comprises a door frame, a door leaf pivotably suspended relative to the door frame between a closed position and an open position, an automatic drive according to one of the preceding claims, and a linkage or a lever with a sliding block and a sliding rail. The automatic drive is either fixed to the door frame and coupled to the door leaf via the linkage or the lever with the sliding block and the sliding rail, or fixed to the door leaf and coupled to the door frame via the linkage or the lever with the sliding block and the sliding rail.

[0025] Such a revolving door benefits from the advantages described above, which are achieved by the respective automatic drive.

[0026] Preferably, the non-electrical energy storage device of the return device is designed to be charged with energy by an opening movement of the door leaf, which is caused or at least supported by the electric drive unit, and to pivot the door leaf back into its closed position with the aid of the charged energy after it has been released.

[0027] The invention will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 an automatic drive for a revolving door according to a first embodiment of the present invention without housing and panels from above; Fig. 2 the automatic drive Fig. 1 from diagonally below; Fig. 3 the automatic drive Fig. 1 with housings and covers shown in a longitudinal section along the output shaft; Fig. 4 the automatic drive Fig. 1 with housings and covers shown in a cross-section at the level of the output shaft; Fig. 5 the automatic drive Fig. 1 with mounted lever; Fig. 6 on the left the driven gear of the last gear stage, on the top right the output shaft with its pinion and on the bottom right the moving component of the automatic drive from Fig. 1; Fig. 7 a modification of the automatic drive from Fig. 1 with mounted rods; and Fig. 8 left the driven gear of the last gear stage, top right the output shaft with its pinion and bottom right the moving component of the automatic drive from Fig. 7.

[0028] In the Fig. 1 and Fig. 2 shows an automatic drive 1 for a revolving door, in particular for a smoke and / or fire door, with housings and panels not shown.

[0029] The automatic drive 1 has an electric drive unit 3, which is coupled to an output shaft 7 via a gear 5. Furthermore, a reset device 9 is coupled to the output shaft 7. To control the electric drive unit 3, the automatic drive 1 further comprises a control unit 11. All of these components are mounted, in particular via housings, on a base body 13, which is designed to fasten the automatic drive 1 to a door leaf or a door frame of the respective revolving door.

[0030] The electric drive unit 3 comprises a brushless DC motor with a motor axis M (cf.: Fig. 3). The transmission 5 comprises three interconnected gear stages 15, 17, and 19. A drive shaft 21 of the electric drive unit 3, which is mounted rotatably about the motor axis M, is rotationally coupled to a pulley 25 via a toothed belt 23 to form the first gear stage 15 in the form of a toothed belt gear stage. The belt 23 can in particular be designed as a toothed belt. The pulley 25 is rotationally fixedly connected to a first pinion 26, and both are mounted rotatably about a first rotation axis R1. This first pinion 26 meshes with a first gear 27, which is mounted rotatably about a second rotation axis R2, to form the second gear stage 17 in the form of a helical spur gear stage.

[0031] The first gear 27 is rotationally coupled to a second pinion 29. To form the third and final gear stage 19 in the form of a spur gear stage, this second pinion 29 meshes with a straight-toothed intermediate gear 31, which itself meshes with a second gear 33. The intermediate gear 31 is rotatably mounted about a third rotation axis R3. The second gear 33 is rotatably mounted about a fourth rotation axis R4 via a rolling bearing 35 in the form of a ball bearing on a sleeve 37 of a housing cover of the gear housing 39.

[0032] The second gear 33 comprises a central funnel-shaped projection 41 (cf.: Fig. 4), in the neck of which a central recess 34 is formed, which is designed in the opposite direction to a pinion 43 formed on the output shaft 7 (cf.: Fig. 6, Fig. 8). The second gear 33 is pushed onto the output shaft 7. The teeth of the pinion 43 of the output shaft 7 are machined on the side facing the second gear 33 to reduce the tooth height (by machining) in order to create an axial stop for the second gear 33. Thus, the second gear 33 is rotationally fixedly coupled to the pinion 43 and consequently to the output shaft 7, forming a spline. The output shaft 7 is rotatably mounted relative to the gear housing 39 via a lower roller bearing and an upper roller bearing 45, each in the form of a needle bearing, so that a rotational axis A of the output shaft 7 coincides with the fourth rotational axis R4 (cf.: Fig. 3). The motor axis M, the rotation axes R1 to R3 and the rotation axis R4 or the rotation axis A are spaced apart from one another, in particular along a common plane, but aligned parallel to one another.

[0033] The lower roller bearing 45 of the output shaft 7 is provided on the previously described sleeve 37 of the gear housing 39 in the same plane (i.e. at the same height) as the roller bearing 35 of the second gear 33 (cf.: Fig. 4). Thus, the rolling bearing 35 of the second gear 33 surrounds the lower rolling bearing 45 of the output shaft 7, forming a particularly compact design. Alternatively, the rolling bearing 35 of the second gear 33 could also surround the upper rolling bearing 45 of the output shaft 7. The designations lower rolling bearing 45 and upper rolling bearing 45 refer to the Fig. 4 shows the orientation of the automatic drive 1.

[0034] Due to this special design, a preferred housing height of 70 mm must be maintained.

[0035] In the embodiment described here, the second gear 33 functions as the driven gear of the last gear stage 19 within the meaning of the present invention. It should be noted that in a case where a transmission 5 with only a single gear stage is to be provided, this single gear stage would also be considered the last gear stage within the meaning of the present invention.

[0036] The drive shaft 21 of the electric drive unit 3 is rotationally fixedly coupled to the output shaft 7 via the gear 5 in a predetermined fixed transmission ratio, whereby the electric drive unit 3, when mounted on a revolving door, can actively pivot the door and / or hold it in a specific position, in particular in its open position.

[0037] In order to automatically pivot the revolving door into its closed position, the automatic drive 1 shown here includes the return device 9.

[0038] The specific structural design and functioning of this reset device 9 is described in more detail below.

[0039] How particularly good in Fig. As can be seen in Figure 1, the reset device 9 implemented here comprises a movable component 49 and a mechanical, non-electrical energy storage device 51 in the form of a helical spring. One (left) end of the helical spring 51 is supported on a spring plate 53, the axial position of which can be adjusted via a worm gear 55. The other (right) end of the helical spring 51 presses against the movable component 49 perpendicular to the rotational axis A of the output shaft 7. The preload of the helical spring 51 can be adjusted via a screw movement on the worm gear 55.

[0040] The movable component 49 is designed in the present case as a piston or in the manner of a piston, which together with the coil spring 51 is located in a bore within a corresponding piston housing 57 (cf.: Fig. 3). The piston housing 57 is a piston housing 57 in which the movable component 49 is movably mounted perpendicular to the rotational axis A of the output shaft 7. The movable component 49 preferably has a clearance of 0.1 to 0.2 mm relative to the inner surface of the piston housing 57 and can be grease-lubricated. The control unit 11 is attached to the base body 13 via the piston housing 57.

[0041] To support the movable component 49, three roller-bearing rollers 59 are provided, arranged side by side along the axial direction of movement of the movable component 49 and aligned parallel to one another. The roller axes RA1 to RA3 of the roller-bearing rollers 59 are all aligned perpendicular to the axial direction of movement of the movable component 49 and are spaced apart from one another in a common plane. They are each rigidly connected to the gear housing 39 via a needle roller sleeve 60a and a corresponding cylindrical pin 60b (cf.: Fig. 4). The radially encircling running surfaces 59a of the roller-bearing-mounted rollers 59 are each shaped in a manner diametrically opposed to a corresponding running surface 49a on the movable component 49 and bear against it. Specifically, the running surface 49a of the movable component 49 is convex transversely, in particular perpendicularly, to the axial direction of movement of the movable component 49, and the running surfaces 59a of the roller-bearing-mounted rollers 59 are correspondingly concavely shaped. This enables a particularly reliable and stable mounting of the movable component 49.

[0042] As an alternative to the embodiment shown with three roller bearings 59 arranged in one plane, more or fewer roller bearings 59, which in particular do not necessarily have to be located in a single plane, can also be provided to support the movable component 49.

[0043] For coupling with the pinion 43 of the output shaft 7, the movable component 49 has an opening 61 through which the pinion 43 of the output shaft 7 extends. The movable component 49 has an axially extending rack section 63 along the inner wall of this opening 61. The teeth of this rack section 63 are in permanent engagement with the teeth of the pinion 43 of the output shaft 7 in order to couple the movable component 49, and thus the return device 9, to the output shaft 7 via a rack gear 65 thus formed.

[0044] The following describes the integration of the automatic drive 1 described above into a revolving door, in particular into a smoke and / or fire door.

[0045] A revolving door with a corresponding automatic drive 1 comprises a door frame and a door leaf pivotably suspended relative to the door frame. The door leaf can be pivoted between a closed position and an open position. The previously described automatic drive 1 is fixed or attached to one of the door frame and the door leaf via its base body 13. Depending on the specific application, either an upper or a lower end of the output shaft 7 is connected in a rotationally fixed manner to a first end 67a of a lever 67 (cf.: Fig. 5). The second end 67b of the lever 67 is rotatably coupled to a sliding block (not shown). Said sliding block is slidably mounted along a sliding rail (not shown), which is fixed or secured to the other of the door frame and the door leaf.

[0046] The functioning of the described automatic drive 1 in such a revolving door, in particular in a corresponding smoke and / or fire door, will now be briefly described.

[0047] Initially, the door leaf is in its closed position, thus closing the opening of the revolving door framed by the door frame. At this point, the automatic drive 1 is in the position shown in the Fig. Condition shown in 1 to 3.

[0048] In order to pass through the revolving door, the door leaf is pivoted from its closed position to its open position by a corresponding control of the electric drive unit 3. During this opening movement, the output shaft 7 rotates with its pinion 43 about the axis of rotation A. Via the rack and pinion gear 65 formed, which acts between the pinion 43 of the output shaft 7 and the movable component 49, this rotary movement of the output shaft 7 results in a translational movement of the movable component 49 perpendicular to the axis of rotation A of the output shaft 7 (to the left in the Fig. 1 to 3). This in turn leads to a compression of the coil spring 51 and thus to a charging of it with potential energy.

[0049] A driving force of the drive unit 3, which is generated for opening and / or subsequently keeping the revolving door open, is transmitted via the gear 5 to the output shaft 7.

[0050] As soon as the door leaf is released, in particular by the motor of the electric drive unit 3 no longer being energized, the coil spring 51, using the previously absorbed potential energy, pushes the movable component 49 perpendicular to the axis of rotation A of the output shaft 7 back into its original position (i.e. to the right into the Fig. 1 to 3).

[0051] Due to the rack and pinion gear 65, this leads to a rotation of the output shaft 7 in the direction opposite to the previous rotation and thus to a pivoting of the door leaf back into its closed position.

[0052] The intermediate gear 31 of the last gear stage 19 of the transmission 5 creates the installation space required for the free movement of the movable component 49. In particular, the intermediate gear 31 enables the further gear stages 15 and 17 of the transmission 5 as well as the electric drive unit 3 to be moved away from the output shaft 7 (into the Fig. 1 to 3 to the right).

[0053] The roller bearings 59, on the other hand, serve to support the axially movable component 49 with as little friction as possible, yet still reliably. A rolling bearing is subject to less friction than a plain bearing.

[0054] This creates a particularly space-saving, reliable and cost-effective overall design.

[0055] In particular, the revolving door formed can be designed to open automatically each time the door is passed through and to close automatically again immediately. Such doors are known, for example, from hospitals, wherein a separate button can be provided to activate the electric drive unit 3 to open the revolving door. With such a configuration, the energy storage device 51 of the resetting device 9 is charged or tensioned each time the door is opened. When the door is closed, the motor of the drive unit 3 can be operated as a generator, thereby braking or dampening the closing movement. This eliminates the need for a separate damping hydraulic system. Before closing, the revolving door can, under certain circumstances, be held open for a predetermined period by the drive unit 3 or a holding device. It would also be conceivable for the drive unit 3 to hold the revolving door open permanently.

[0056] Finally, it should be noted that in the embodiment described above, the driven gear 33 of the last gear stage 19, the pinion 43 of the output shaft 7 and the movable component 49 Fig. 6. Specifically, the pinion 43 of the output shaft 7 is designed to be rotationally irregular. The recess 34 in the second gear 33 and the opening 61 with the rack section 63 in the movable component 49 are designed to be correspondingly irregular, in particular wave-shaped. This specific design of the Fig. 6 shown components is based on the Fig. 5, the automatic drive 1 is tailored to the use shown in a revolving door with a lever 67, a sliding block (not shown), and a sliding rail (not shown). This irregular shape allows the torque characteristic of the automatic drive 1 to be adapted to the requirements of such revolving doors in a particularly simple and reliable manner.

[0057] Alternatively to the Fig. In addition to the coupling shown in Figure 5 by means of a lever 67 with a sliding block and a sliding rail, embodiments are also possible in which the automatic drive 1 is coupled to the door frame or the door leaf via a rod 69.

[0058] For example, see Fig. As shown in Figure 7, such a linkage 69 comprises, for example, a first arm 71, which is coupled at its first end 71a in a rotationally fixed manner to the output shaft 7 and at its second end 71b, opposite the first end 71a, via a pivot joint to a first end 73a of a second arm 73. The second end 73b of the second arm 73, opposite the first end 73a, is coupled via a further pivot joint to a foot 75 of the linkage 69. The foot 75 is designed to be immovably attached to the door frame or door leaf in order to couple the automatic drive 1 thereto.

[0059] In order to obtain an advantageous torque characteristic in such a configuration with a linkage 69, the pinion 43 of the output shaft 7 is preferably designed to be rotationally symmetrical. Accordingly, the recess 34 in the second gear 33 is also designed to be rotationally symmetrical, and the rack section 63 in the opening 61 of the movable component 49 is designed to be uniform, in particular straight. Such a configuration is exemplified in Fig. 8 shown.

[0060] Through the specific choice of design or by simply exchanging the three in the Fig. 6 and Fig. 8, the formed automatic drive 1 can be adapted to the specifically intended use (i.e. either with a slide-rail mounted lever 67 or with a rod 69) without a complex adaptation of the other components of the automatic drive 1.

[0061] Finally, it should be noted that, in light of the above description of the exemplary embodiments, a person skilled in the art will readily conjure up a multitude of obvious combinations and / or equivalent modifications thereof. Such combinations may not be explicitly described herein, but are nevertheless encompassed by the scope of the appended claims. List of reference symbols 1 automatic drive 3 electric drive unit 5 gearboxes 7 Output shaft 9 Reset device 11 Control unit 13 basic bodies 15 first gear stage 17 second / middle gear stage 19 third / last gear stage 21 Drive shaft 23 belts 25 pulley 26 first pinion 27 first gear 29 second pinion 31 intermediate gear 33 second / driven gear 34 recess 35 Rolling bearing of the second gear 33 37 sleeve 39 Gearbox housing 41 lead 43 Pinion of the output shaft 7 45 lower and upper rolling bearings 49 moving component / piston 49a Running surface along the movable component 49 51 Energy storage / coil spring 53 spring plates 55 worm gears 57 piston housing 59 roller bearings 59a Running surface along the roller bearing 59 60a needle sleeve 60b cylinder bolt 61 Breakthrough 63 Rack section 65 rack and pinion gears 67 levers 67a first end 67b second end 69 rods 71 first arm 71a first end 71b second end 73 second arm 73a first end 73b second end 75 feet A axis of rotation of the output shaft M motor axle R1 first rotation axis R2 second rotation axis R3 third rotation axis R4 fourth rotation axis RA1 first roller axis RA2 second roller axis RA3 third roller axis

Claims

[1] Automatic drive (1) for a revolving door, in particular for a smoke and / or fire door, the automatic drive (1) comprising: an electric drive unit (3) which, in the assembled state, is designed to actively pivot the revolving door from its closed position to its open position and / or to hold it in its open position; a transmission (5) which couples the electric drive unit (3) to a rotatably mounted output shaft (7) of the automatic drive (1); and a reset device (9) with a non-electrical energy store (51); wherein the return device (9) is designed to act on the revolving door in the direction of its closed position when mounted, wherein the non-electrical energy storage device (51) is coupled to the output shaft (7) via a component (49) movable perpendicular to the axis of rotation (A) of the output shaft (7), and the movable component (49) is mounted on roller bearings wherein the movable component (49) is supported by at least one roller bearing (59), in particular by at least two and preferably by at least three roller bearing rollers (59), wherein the roller bearing (59) for supporting the movable component (49) has a radially encircling running surface (59a) which is shaped opposite to a corresponding axially extending running surface (49a) of the movable component (49) and bears against it, characterized by , that the running surface (49a) of the movable component (49) is convex transversely, in particular perpendicularly, to the axial direction of movement of the movable component (49) and the corresponding running surface (59a) of the roller-bearing roller (59) for supporting the movable component (49) is concavely shaped transversely, in particular perpendicularly, to the axial direction of movement of the movable component (49). [2] Automatic drive (1) according to claim 1, wherein the movable component (49) is designed as a piston which is mounted axially movable, in particular with play, along a bore within an associated piston housing (57) of the automatic drive (1). [3] Automatic drive (1) according to claim 2, wherein the non-electrical energy storage device (51) is provided at least partially, in particular completely, in the bore of the piston housing (57). [4] Automatic drive (1) according to one of the preceding claims, wherein the non-electrical energy storage device (51) is a mechanical energy storage device, which is designed in particular in the form of an axially acting helical spring (51) which acts on the movable component (49). [5] Automatic drive (1) according to one of the preceding claims, wherein the movable component (49) has an axially extending rack portion (63) which is in permanent engagement with a pinion (43) of the output shaft (7). [6] Automatic drive (1) according to claim 5, wherein the rack section (63) of the movable component (49) is held transversely to the axial direction of movement of the movable component (49) between the pinion (43) of the output shaft (7) and the roller-bearing rollers (59). [7] Automatic drive (1) according to one of the preceding claims, wherein the roller axes (RA1, RA2, RA3) of the roller-bearing rollers (59) are aligned transversely, in particular perpendicularly, to the axial direction of movement of the movable component (49) and / or parallel to one another. [8] Automatic drive (1) according to one of the preceding claims, wherein the roller bearing mounted rollers (59) are spaced apart from each other in the axial direction of movement of the movable component (49), and in particular in a common plane. [9] Automatic drive (1) according to one of the preceding claims, wherein the rollers (59) mounted on roller bearings for supporting the movable component (49) are each rigidly connected in a translational manner to a gear housing (39) of the automatic drive (1), and / or wherein the rollers (59) mounted on roller bearings for supporting the movable component (49) are each fixed via a needle sleeve (60a) and a corresponding cylinder bolt (60b). [10] Automatic drive (1) according to one of the preceding claims, wherein the electric drive unit (3) comprises an electric motor, in particular in the form of a currentless magnetic electric motor, the motor axis (M) of which is aligned in particular transversely, preferably perpendicularly, to the axial direction of movement of the movable component (49), and / or which is designed to act as a generator when the revolving door is pivoted in the direction of its closed position in order to dampen a closing movement of the revolving door. [11] Automatic drive (1) according to one of the preceding claims, wherein the transmission (5) is designed as a multi-stage transmission, wherein the first stage (15) is designed as a toothed belt or spur gear stage. [12] Revolving door, in particular smoke and / or fire door, comprising: a door frame; a door leaf pivotally mounted relative to the door frame between a closed position and an open position; an automatic drive (1) according to one of the preceding claims; and a rod (69) or a lever (67) with a sliding block and a sliding rail; wherein the automatic drive (1) is either fixed to the door frame and coupled to the door leaf via the rod (69) or the lever (67) with the sliding block and the sliding rail, or fixed to the door leaf and coupled to the door frame via the rod (69) or the lever (67) with the sliding block and the sliding rail. [13] Revolving door according to claim 12, wherein the non-electrical energy storage device (51) of the return device (9) is designed to be charged with energy by an opening movement of the door leaf, which is caused or at least supported by the electric drive unit (3), and to pivot the door leaf back into its closed position with the aid of the charged energy after it has been released.

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