Drive with absolute position detection

Abstract

The present invention relates to a drive for a sash of a window, door, or the like, comprising a housing, a motor, a gear unit housed in the housing for driving an output shaft for opening and / or closing the sash, wherein the output shaft is rotationally fixed to an output gear of the gear unit, and a sensor unit for detecting the position of the output gear, wherein the sensor unit has at least one sensor wheel which is effectively coupled to the output gear, and a sensor for detecting a rotational movement of the at least one sensor wheel. The circumference of the at least one sensor wheel corresponds essentially to the length of a circular arc of the output gear, which the output gear traces when the sash moves from the open position to the closed position and / or vice versa.

Description

[0001] The present invention relates to a device, in particular for a sash of a window, a door or the like, comprising a housing, a motor, a gear unit housed in the housing for driving an output shaft for opening and / or closing the sash, wherein the output shaft is rotationally fixed to an output wheel of the gear unit, and a sensor unit for detecting the position of the output wheel, wherein the sensor unit has at least one sensor wheel which is coupled to the output wheel in a drive-effective manner, and a sensor for detecting a rotational movement of the at least one sensor wheel.

[0002] In automatic revolving doors, the door position is typically detected using microswitches, a combination of permanent magnets, or a Hall-effect sensor array, often in conjunction with a pulse disc, particularly one that is optically readable. However, in the event of a power outage and subsequent restoration of power, automatic revolving door operators using these conventional encoders lose the door's position data. Consequently, a time-consuming learning cycle must be performed before the door can be used again. This requires moving the door to a predefined position to enable relative position detection, or, alternatively, calibration after a power outage. During this time, the door cannot be used. This is particularly inconvenient during peak pedestrian traffic and also poses a safety risk.

[0003] In addition to the relative encoders mentioned, there are also absolute encoders (also called absolute value encoders or absolute rotary encoders), which are usually mounted directly on the drive motor. This eliminates the need for the learning cycles mentioned earlier. However, absolute encoders typically have multiple gears and sensors to operate over a wide rotational speed range. Consequently, they are relatively expensive. Furthermore, these absolute encoders have the disadvantage of requiring considerable installation space.

[0004] From DE 10 2018 206 578 A1, a drive is known which has a sensor wheel that is effectively coupled to the output wheel and a sensor for detecting a rotational movement of at least one sensor wheel. More precisely, the sensor wheel is not directly coupled to the output wheel, but rather meshes with an external toothing of the axle connection of the door leaf. However, a realistic implementation of such a drive appears difficult. Furthermore, the disclosed drive cannot detect the door position with high precision.

[0005] The invention therefore aims to create a drive with absolute position detection that overcomes the aforementioned disadvantages. In particular, the drive should allow for precise detection of the absolute door position and be easy to implement, especially requiring as little installation space as possible so that existing drives can be retrofitted accordingly. Furthermore, the drive should be comparatively inexpensive to manufacture.

[0006] According to the invention, this problem is solved by a drive having the features of claim 1 and by a window or a door having the features of claim 10.

[0007] Preferred embodiments of the drive according to the invention are shown in the dependent claims, the description and the drawings.

[0008] The drive according to the invention is characterized in that the circumference of the at least one sensor wheel essentially corresponds to the length of a circular arc of the output wheel, which the output wheel traces when the wing moves from the open position to the closed position and / or vice versa.

[0009] Since the sensor wheel is effectively (directly) coupled to the output wheel by, for example, meshing with it, the sensor wheel essentially completes a full rotation around its own axis during a movement of the wing from the open position to the closed position (and / or vice versa).

[0010] The term "essentially" with regard to the length of the circumference of the sensor wheel or the circular arc of the output wheel is understood to mean a deviation from a circular arc length that corresponds to ± 15°, preferably ± 10°, particularly preferably ± 5°, and most preferably ± 3°. Therefore, an "essentially complete revolution" is understood to mean a revolution of 360° ± 15°, preferably ± 10°, particularly preferably ± 5°, and most preferably ± 3°.

[0011] Preferably, the rotation angle of the sensor wheel remains below 360° during movement of the door leaf, as this allows for simple and absolute detection of the door position. Particularly preferably, the rotation angle of the sensor wheel is exactly 360° when the door is opened or closed; that is, the circumference of the sensor wheel preferably corresponds exactly to a 180° rotation of the driven wheel. This fully utilizes the circumference of the sensor wheel for position detection of the driven wheel. However, such accuracy is hardly achievable in practice due to backlash or other tolerance deviations. Therefore, the sensor wheel is preferably rotated by a maximum of 355° when the door is opened or closed to account for such tolerances.

[0012] The sensor unit is advantageously located inside the housing, but it can also be located outside.

[0013] The gear unit preferably comprises several stages, for example a helical gear stage as an input stage and two subsequent spur gear stages, wherein the last spur gear is connected to the output shaft and thus represents the output gear.

[0014] The motor can be located inside the housing, or it can be located outside the housing (especially on the front). It can be connected to the housing directly or via an adapter (e.g., screwed on).

[0015] The drive is preferably an automatic revolving door drive.

[0016] Overall, the drive according to the invention provides a simple, compact, and cost-effective solution for detecting the absolute position of a door. It is sufficient to calibrate the drive once during installation and to record the "zero position" or starting position. This position is then stored. The sensor unit can then (after calculation with the zero position) always clearly indicate the position of the window or door sash – even after a power failure.

[0017] In one embodiment, when the wing moves from the open position to the closed position and / or vice versa, the sensor wheel undergoes a substantially complete rotation (maximum).

[0018] In other words, the circumference of at least one sensor wheel in this embodiment essentially corresponds to the length of the circular arc of the output wheel, which the output wheel traces when the wing moves from the open position to the closed position and / or vice versa. To be able to detect an absolute position, a maximum of one complete rotation is advantageously performed. A slightly smaller rotation, e.g., by 350°, should also be included. With this dimensional relationship between the sensor wheel and the output wheel, a (essentially) maximum resolution of the rotational movement of the output wheel can be achieved. The door position can therefore be detected with high precision in this embodiment.

[0019] In a preferred embodiment of the drive, the circumference of the sensor wheel is essentially 24 / 36, preferably essentially 19 / 36, particularly preferably essentially ½, of the circumference of the output wheel.

[0020] Since the present drive is advantageously designed such that when the door moves from the closed to the open position (or vice versa), the output wheel rotates by a maximum of 180° or 190°, the circumference of the sensor wheel should correspond to at least 1 / 2, preferably at least 19 / 36, of the circumference of the output wheel in order to detect an absolute door position. Preferably, the entire circumference of the sensor wheel is utilized, so that the circumference of the sensor wheel is a maximum of 19 / 36 or 1 / 2 of the circumference of the output wheel. Particularly preferably, the circumference of the sensor wheel is substantially 19 / 36 or 1 / 2 of the circumference of the output wheel, thus allowing for a certain degree of play.

[0021] Depending on the mounting method and linkage type, the rotation angle of the output shaft can be up to 240° when the door is opened 180°. Therefore, the circumference of the sensor wheel is advantageously at least 24 / 36 of the circumference of the output wheel, preferably substantially 24 / 36 of the circumference of the output wheel. This ensures that the sensor wheel essentially rotates 360° when the output shaft or output wheel is rotated by 240°.

[0022] Furthermore, embodiments are conceivable in which the circumference of the sensor wheel is essentially 20 / 36, 21 / 36 or 22 / 36 of the circumference of the output wheel.

[0023] In one embodiment, the output wheel is coupled to the at least one sensor wheel via a friction-fit and / or positive-fit connection to provide a drive.

[0024] Both the sensor wheel and the driven wheel can be meshing wheels, for example, meshing spur gears. However, it is also conceivable that the driven wheel is a spur gear, while the sensor wheel has a rubber ring around its circumference, designed to be in frictional contact with the driven wheel.

[0025] In another embodiment, the sensor wheel is designed as a spur gear, bevel gear, helical gear, crown gear and / or rack.

[0026] If the sensor wheel is designed as a rack, the circumference of at least one rack is understood to be the length of the rack segment by which it shifts when the wing moves from the open to the closed position or vice versa. That is, the length of this segment essentially corresponds to the length of a circular arc traversed by the output wheel when the wing moves from the open to the closed position or vice versa. The linear displacement of the rack is detected by the sensor of the sensor unit. A Hall sensor, in particular, can be used to detect this linear displacement.

[0027] The sensor wheel can be manufactured from plastic as an injection-molded part, making it particularly cost-effective.

[0028] In another embodiment, the sensor unit has several sensor wheels.

[0029] In a preferred embodiment, the sensor unit or sensor wheel is arranged between the output shaft and the motor.

[0030] There is usually enough space here to mount the sensor wheel, so there is no need to enlarge the drive unit or its housing. The drive unit can still be designed to be compact.

[0031] In the depth direction of the drive, i.e., in a direction that runs essentially perpendicular to the line connecting the motor and the output shaft (i.e., the longitudinal direction), the axis of the sensor wheel is preferably arranged as close as possible to one of the longitudinally extending housing sides. It is particularly preferred that the axis of the sensor wheel is arranged closer to one of these housing sides than all the spur gears of the transmission unit.

[0032] In a preferred embodiment, the sensor is designed as a Hall sensor.

[0033] The Hall sensor is designed to detect the movement of the sensor wheel equipped with a magnet, preferably a rotary movement. In other words, a magnet is preferably arranged / attached to the sensor wheel, and its rotation is detected by a Hall sensor. In principle, other sensor devices besides a magnet in combination with a Hall sensor are also conceivable, which are suitable for detecting a rotary movement (of the sensor wheel), for example, a potentiometer. However, Hall sensors have the advantage that they can be operated without contact and therefore do not exhibit any wear in this respect. Depending on the design, the Hall sensor can be configured to detect a linear movement of the sensor wheel (e.g., in the form of a rack and pinion).

[0034] In another embodiment, the sensor is housed in a sensor housing of the sensor unit and the sensor wheel is rotatably arranged on the sensor housing, wherein the sensor wheel is in particular cup-shaped.

[0035] The sensor wheel is rotatably mounted on the sensor housing. It is advantageously secured axially by clipping or snapping into an undercut in the sensor housing. To extend the running surface and thus increase operational reliability, the sensor wheel can also be cup-shaped.

[0036] The sensor housing is preferably permanently connected to the drive housing. Part of the sensor housing can protrude into the drive housing, while another part protrudes from it, for example, to allow for the connection of data cables or similar components to the sensor. The sensor housing can be clamped to the housing (e.g., using a nut). For this purpose, an external thread can be provided on the outside of the sensor housing.

[0037] In principle, the sensor housing can be formed by part of the gearbox housing.

[0038] In a particularly preferred embodiment of the drive, the housing has two housing sides extending substantially in the longitudinal direction of the drive, which are substantially opposite each other in the depth direction of the housing, and the gear unit has a helical gear stage with a worm and a helical gear. The axis of rotation (hereinafter referred to simply as the axis) of the sensor wheel is arranged closer to the housing side that is further away from the axis of rotation (hereinafter referred to simply as the axis) of the helical gear in the depth direction.

[0039] This arrangement allows for a particularly large amount of installation space for the sensor wheel, especially in the depth direction. Consequently, the diameter of the sensor wheel can be made comparatively large. This, in turn, enables a particularly high-resolution position detection of the rotation angle of the output wheel (or the opening angle of the door).

[0040] In another embodiment, the drive also has an energy storage device, wherein the energy storage device is arranged on a side of the output shaft opposite the motor.

[0041] This creates sufficient installation space within the housing for the sensor unit. Furthermore, this arrangement simplifies the design and manufacturing of the drive and enables a modular construction, allowing the drive to be manufactured and sold even without the energy storage devices.

[0042] In one embodiment, the drive also includes an evaluation unit and / or a control unit.

[0043] In the sensor unit, the sensor detects the rotation angle of the rotatable sensor wheel. The opening angle of the door or window sash can be calculated from this rotation angle using the ratio of the sensor wheel's size to the driven wheel's size, or the ratio between the sensor wheel's circumference and the length of the driven wheel's arc traced during the sash's opening or closing movement. The mathematical equations required for this calculation can be stored in the evaluation unit. The evaluation unit is connected to the sensor unit to receive the detected rotation angle of the sensor wheel during the sash movement. The evaluation unit can be a programmable logic controller (PLC) connected to the sensor unit. Depending on the design, the sensor and evaluation unit can be connected via cable or wirelessly to transmit the rotation angle.In principle, it is also conceivable that the evaluation unit is integrated into the sensor unit.

[0044] The control unit is designed to receive the opening angle of the door or window sash determined by the evaluation unit and to control the opening and / or closing movement of the sash accordingly. Especially with fully or semi-automated doors, knowledge of the door or window position is advantageous, if not essential, for controlling the opening or closing movement, in addition to the opening or closing command, for safety reasons and for precise operation. This ensures, for example, that the door or window opens to a predefined opening angle and closes completely.

[0045] The invention is described below by way of example with reference to the drawings. The drawings show (schematically) Fig. 1 a first embodiment of the drive according to the invention in perspective view; Fig. 2 the first embodiment of the drive according to the invention neglecting the housing and the energy storage device; Fig. 3 the first embodiment of the drive according to the invention neglecting a covering housing part in a top view; Fig. 4 a partial view of the first embodiment of the drive according to the invention neglecting a covering housing part in a bottom view; Fig. 5 a section of a sectional view of the first embodiment of the drive according to the invention along the longitudinal direction of the drive; Fig. 6 Fig. 5 , wherein different components are hatched differently for better distinguishability; Fig. 7 the sensor unit of the first embodiment of the drive according to the invention in perspective view; Fig. 8 a section of a sectional view of a second embodiment of the drive according to the invention along the longitudinal direction of the drive, wherein the section shows in particular the sensor unit; Fig. 9 a third embodiment of the drive according to the invention neglecting a covering housing part in a top view; Fig. 10 a partial view of the third embodiment of the drive according to the invention neglecting a covering housing part in a bottom view; Fig. 11 a section of a sectional view of the third embodiment of the drive according to the invention along the longitudinal direction of the drive.

[0046] Fig. 1 Figure 1 shows a first embodiment of the drive 10 according to the invention in a perspective view. The drive 10 has a housing 12, which essentially encloses components of the drive 10, such as the gear unit 16. The housing 12 serves in particular to protect these components from external influences (dust, moisture, etc.). In this case, the housing 12 consists of several housing parts that are screwed together. The motor 14 and the energy storage device 50 of the drive 10 are connected to the housing.

[0047] Fig. 2 Figure 1 shows the first embodiment of the drive 10 according to the invention, neglecting the housing 12 and the energy storage device 50. The motor 14, which is generally designed as an electric motor, drives the output shaft 18 coupled to the gear unit 16 via the gear unit 16, so that a drive torque generated by the motor 14 is transmitted to the output shaft 18 in order to pivot a linkage (not shown) coupled to the output shaft 18 in such a way that a door or window sash coupled to the linkage is moved from a closed position to an open position (and vice versa).

[0048] The gear unit 16 is designed as a reduction gearbox, meaning that the torque provided by the motor 14 is increased by the gear unit 16, while the speed provided by the motor 14 is reduced by the gear unit 20. For this purpose, the gear unit comprises a worm gear stage and several, in this case two, spur gear stages. More precisely, the gear unit has a worm 26, which is driven by the motor shaft 142. The worm 26 meshes with a helical gear 24, which is rotationally fixed to a first pinion 25. The first pinion 25 meshes with a first spur gear 22, which is rotationally fixed to a second pinion 23. The second pinion 23, in turn, is effectively connected to the output gear 10 (second spur gear).

[0049] A cam slide 19, in this embodiment a symmetrical cam disk 19, is mounted on the output gear 20. The output gear 20 and the cam disk 19 are fixedly connected to each other. The output shaft 18, in turn, is rotationally fixed to the cam disk 19.

[0050] The sensor unit 30 is in Fig. 2 not shown.

[0051] Fig. 3 The first embodiment of the drive 10 according to the invention is shown in a top view, neglecting a covering housing part. Apart from the aforementioned covering housing part, the housing 12 is in Fig. 3 However, it has been shown.

[0052] In addition to the in Fig. 2 The components shown are in Fig. 3 Furthermore, parts of the sensor unit 30 of the drive 10 according to the invention are shown.

[0053] The sensor unit 20 is visibly arranged within the housing 12 for the gear unit 16. The sensor unit has, in particular, a sensor wheel 32 which meshes with the output wheel 20 and is thus effectively coupled to it for drive purposes, so that the position of the output wheel 20 can be derived from the position of the sensor wheel 32. In other words, the sensor wheel 20 engages with the output wheel 20 for position detection. In this first embodiment, the sensor wheel is designed as a spur gear. However, a bevel gear design is also conceivable, for example. Furthermore, engagement of the two wheels via toothing is not strictly necessary. A frictional coupling can also be used.

[0054] The sensor wheel rotates around axis 320. In the depth direction T of the drive, axis 220 of the first spur gear 22, axis 200 of the output gear 20, axis 240 of the helical gear 24, and axis 320 are arranged in this order (or vice versa). In the longitudinal direction L, the motor 14, the gear unit 16, and the energy storage device 50 are arranged in this order (or vice versa). Axis 320 of the sensor wheel 32 is located in the longitudinal direction L between axis 240 of the helical gear 24 and axis 200 of the output gear 20. Therefore, the (usually unused) installation space between the output gear 20 and the helical gear 24 is optimally utilized.

[0055] Fig. 4 shows a partial view of the first embodiment of the drive 10 according to the invention, neglecting a covering housing part in a bottom view.

[0056] It can be seen that the cam disc 19 has two running surfaces for left- and right-hand rotation (depending on the mounting method). Symmetrical cam discs 19, like the one shown, can be rotated by a maximum of 180°, while asymmetrical cam discs 19 can be rotated by, for example, 190° or 170°. The cam disc 19 rests against an outer circumferential surface of the roller 63, so that the roller 63 can roll on the running surface of the cam disc 19 during operation. The roller 63 is rotatably mounted on a pivot lever 60, which is pivotally attached to a housing 12 of the door drive 10 about a pivot axis 62. In addition to the roller 63, a support 65 for the energy storage device 50 in the form of a coiled compression spring is attached to the pivot lever 60, more precisely at a coupling point between the pivot lever 60 and the roller 63. With this setup, the strength of the tension of the spiral compression spring is adjusted depending on the position of the cam disk 19.The energy storage device 50 can be charged and discharged in a known manner by moving the cam disk 19.

[0057] Fig. 4 Figure 3 further shows the sensor wheel 32 and how it is coupled to the output wheel 20, namely by the toothing 322 of the sensor wheel 32 and the toothing 202 of the output wheel 20. The size ratio of sensor wheel 32 to output wheel 20 is also shown. Fig. 4 Clearly recognizable. The sensor wheel 32 is significantly smaller than the output wheel 20. In particular, the circumference of the sensor wheel 32 is dimensioned such that it essentially corresponds to the length of a circular arc of the output wheel 20, which the output wheel 20 traces when the wing moves from the open position to the closed position and / or vice versa. The sensor wheel 32 therefore advantageously has as many teeth as are arranged on the output wheel 20 over the area to be detected, so that the sensor wheel 20 is always rotated by a maximum of one revolution over the area to be detected. This ensures the best accuracy of the position detection and a cost-effective implementation.

[0058] Advantageously, the entire opening and closing movement of the door is detected, during which the output shaft is rotated by up to 180°. For this purpose, the sensor wheel 32 has (approximately) half the number of teeth (or half the circumference) of the output wheel 20. In this case, the toothing of the 322 of the sensor wheel 32 has 37 teeth, while the toothing 202 of the output wheel 20 has exactly twice the number of teeth. Accordingly, when the door leaf moves from the open position to the closed position and / or vice versa, an essentially complete rotation of the sensor wheel 32 can occur.

[0059] Fig. 5 Figure 1 shows a section of a sectional view of the first embodiment of the drive 10 according to the invention along the longitudinal direction L of the drive 10. The focus here is particularly on the sensor unit 30. Although not clearly evident from Fig. 5 The sensor wheel 32, which is removable, is rotatably mounted on the sensor housing 38, which surrounds the sensor 36, in the first embodiment of the drive 10. In the axial direction, i.e., along the axis 320, the sensor wheel 32 is secured by clipping or snapping into an undercut of the sensor housing 38, or is axially displaceable and connected to the sensor housing 38. The sensor wheel 32 has a cup-shaped design. This allows the running surface of the sensor wheel 32 to be extended, thus increasing overall functional reliability.

[0060] A magnet 40 is attached to the sensor wheel 32, and its rotation can be detected by the sensor 36, preferably a Hall sensor. Accordingly, the sensor 36 is configured to detect a rotational movement of the magnet 40. In this embodiment, the sensor 36 is mounted on a circuit board 37, which is also housed in the sensor casing 38.

[0061] The sensor housing 38 is fixedly connected to the housing 12 of the gearbox unit 16. In the illustrated embodiment, part of the sensor housing 38 projects into the housing 12, while another part projects out of the housing 12. This allows data and / or power cables to be easily connected to the sensor 38. The sensor housing 38 can be attached to the housing 12, for example, by means of a nut 39. For this purpose, an external thread can be provided on the outside of the sensor housing 38 (not shown).

[0062] Fig. 6 shows Fig. 5 , where different components are hatched differently for better differentiation.

[0063] Fig. 7 Figure 1 shows a perspective view of the sensor unit 30 of the first embodiment of the drive 10 according to the invention. It is particularly evident how the toothing 322 of the cup-shaped sensor wheel 32 engages with the toothing 202 of the output wheel 20. Furthermore, the fastening of the sensor wheel 32 to an undercut of the sensor housing 38 via several locking lugs 324 is clearly visible. The nut 39 for fastening the sensor housing 38 to the housing 12 via a thread is also shown.

[0064] Fig. 8 Figure 1 shows a section of a sectional view of a second embodiment of the drive 10 according to the invention along the longitudinal direction of the drive 10, the section showing in particular the sensor unit 30. In fact, the second embodiment differs from the first embodiment only in the construction of the sensor unit 30. Here, part of the housing 12 forms the sensor housing 38. In other words, a separate sensor housing is not necessary. In this embodiment, the sensor wheel 32 is thus rotatably mounted (directly) on a part of the housing 12. Furthermore, in this embodiment, the circuit board 37, on which the sensor 36 is arranged, is arranged (directly) on the housing, e.g., screwed and / or glued to it. By eliminating a separate sensor housing 38, the costs for the drive 10 can be reduced even further with the second embodiment.

[0065] Fig. 9 A third embodiment of the drive 10 according to the invention is shown in a top view, neglecting a covering housing part. Apart from the aforementioned covering housing part, the housing 12 is in Fig. 9 However, it has been shown.

[0066] In the third embodiment, the sensor wheel 32, or the entire sensor unit 30, is arranged within the housing 12 for the gear unit 16. The sensor wheel 32 is designed as a spur gear and meshes with the output gear 20, thus being effectively coupled to it for drive purposes. In this respect, the third embodiment does not differ from the first embodiment. This also applies to the essential components of the drive 10.

[0067] The third embodiment of the drive 10 differs from the first embodiment in particular with regard to the arrangement of the sensor wheel 32 (or the entire sensor unit 30) and the components of the gear unit 16.

[0068] In the first embodiment, the sensor wheel 32 is offset in the depth direction T relative to the worm gear 26, or rather, positioned closer to the longitudinally extending housing side L that is further away from the worm gear 26. In the third embodiment, the sensor wheel 32 is positioned closer to the longitudinally extending housing side L that is closer to the worm gear 26. This positioning of the sensor wheel 32 in the third embodiment is made possible by positioning the first spur gear 22 closer to the other longitudinally extending housing side L than in the first embodiment. In particular, in the third embodiment, the first spur gear 22 is positioned closer to the longitudinally extending housing side L that is further away from the worm gear 26. This creates sufficient space on the opposite side of the housing 12 for the sensor wheel 32.The sensor wheel 32 is arranged (in the depth direction T) accordingly opposite the worm gear 24 and the first spur gear 22. Furthermore, in the third embodiment, the worm 26 and the sensor wheel 32 overlap when viewed in the height direction (perpendicular to the longitudinal direction L and the depth direction T). In the [reference to figure] Fig. 9 In the top view shown, the sensor wheel 32 is positioned below the worm gear 26.

[0069] In this embodiment, the sensor wheel 32 or the sensor unit 30 is provided with more space than in the first embodiment. The sensor wheel 32 can therefore be made larger (especially with regard to its diameter).

[0070] Fig. 10 shows a partial view of the third embodiment of the drive 10 according to the invention, neglecting a covering housing part in a bottom view. Fig. 10 It can be seen that in the third embodiment of the drive 10, in the depth direction T, the axis 320 of the sensor wheel 32, the axis 200 of the output wheel 20 and the axis 240 of the helical wheel 24 (or the axis 220 of the first spur gear 22) are arranged in this order.

[0071] In order to provide more space for the sensor wheel 32 or the sensor unit 30 than in the first embodiment, the axis 320 of the sensor wheel 32 is advantageously arranged closer to the housing side extending in the longitudinal direction L, which is further away from the axis 240 of the screw wheel 24 in the depth direction T.

[0072] The arrangement of the sensor wheel 32 or the sensor unit 30 in the third embodiment allows for the realization of virtually all mounting and linkage configurations. This is because, in the third embodiment, the sensor wheel 32 can be designed with such a large diameter that its circumference is advantageously at least, and particularly substantially, 24 / 36 of the circumference of the output wheel 20. If the sensor wheel 32 rotates 360°, the output wheel 20 (or the output shaft) 18 can then be rotated substantially 240° (or vice versa).

[0073] The cam disc 19 is, in this case, an asymmetrical cam disc 19. In principle, however, the cam disc 19 can also be symmetrical. Furthermore, solutions are conceivable in which no cam disc 19 is used at all.

[0074] Fig. 11 Figure 1 shows a section of a sectional view of the third embodiment of the drive according to the invention along the longitudinal direction L of the drive. It is clearly visible that in the vertical direction H, the sensor unit 30 is arranged below the worm gear 26. The sensor wheel 32 is supported in this case by a ball bearing 72. Other bearing types are also conceivable. For example, the sensor wheel 32 can be mounted in a plain bearing. This type of support allows the sensor wheel 32 to operate with exceptional durability and wear resistance. Furthermore, it enables it to absorb axial forces very effectively. Bezugszeichenliste

[0075] 10 Drive 12 Housing 14 Motor 142 Motor shaft 16 Gear unit 18 Output shaft 19 Cam disc 20 Output gear 200 Output gear axle 202 Output gear teeth 22 First spur gear 220 First spur gear axle 23 Second pinion 24 Helical gear 240 Helical gear axle 25 First pinion 26 Worm gear 32 Sensor wheel 36 Sensor 37 Circuit board 38 Sensor housing 320 Sensor wheel axle 322 Sensor wheel teeth 324 Detent lug 39 Nut 40 Magnet 50 Energy storage 60 Swivel lever 62 Swivel shaft 63 Roller 65 Abutment T Depth direction L Longitudinal direction

Claims

1. Drive (10) for a sash of a window, door or the like, comprising a housing (12), a motor (14), a gear unit (16) housed in the housing (12) for driving an output shaft (18) for opening and / or closing the sash, wherein the output shaft (18) is rotationally fixed to an output wheel (20) of the gear unit (16), and a sensor unit (30) for detecting the position of the output wheel (20), wherein the sensor unit (30) comprises at least one sensor wheel (32) which is effectively coupled to the output wheel (20) for driving, and a sensor (36) for detecting a rotational movement of the at least one sensor wheel (32), characterized by the fact that the circumference of at least one sensor wheel (32) essentially corresponds to the length of a circular arc of the output wheel (20), which the output wheel (20) traces when the wing moves from the open position to the closed position and / or vice versa.

2. Drive (10) according to claim 1, wherein, during a movement of the wing from the open position to the closed position and / or vice versa, a maximum of one substantially complete revolution of the sensor wheel (32) takes place.

3. Drive (10) according to claim 1 or 2, wherein the circumference of the sensor wheel (32) corresponds substantially to 24 / 36, preferably substantially to 21 / 36, particularly preferably substantially to ½, of the circumference of the output wheel (20).

4. Drive (10) according to one of the preceding claims, wherein the output wheel (20) is coupled to the at least one sensor wheel (32) via a friction-fit and / or positive-fit connection in a drive-effective manner.

5. Drive (10) according to one of the preceding claims, wherein the sensor wheel (32) is designed as a spur gear, bevel gear, helical gear, crown gear and / or rack.

6. Drive (10) according to one of the preceding claims, wherein the sensor wheel (32) is arranged between the output shaft (18) and the motor (14).

7. Drive (10) according to one of the preceding claims, wherein the sensor (36) is designed as a Hall sensor.

8. Drive (10) according to one of the preceding claims, wherein the sensor (36) is housed in a sensor housing (38) of the sensor unit and the sensor wheel (32) is rotatably arranged on the sensor housing (38), wherein the sensor wheel (32) is in particular cup-shaped.

9. Drive (10) according to one of the preceding claims, wherein the housing (12) has two housing sides extending substantially in the longitudinal direction of the drive (10) which are substantially opposite each other in the depth direction of the housing (12), and wherein the gear unit (16) has a helical gear stage with a worm (26) and a helical gear (24), wherein the axis of rotation (320) of the sensor wheel (32) is arranged closer to the housing side which is arranged further away in the depth direction from the axis of rotation (240) of the helical gear 24.

10. Window or door with a pivotally mounted sash and a drive (10) according to one of claims 1 to 9 for opening and / or closing the sash.

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