Door drive for one door leaf with roller chain and locking unit

Abstract

The invention relates to a door drive (20) for a door leaf, comprising - a roller chain (24) driven by a motor (22), - a gear wheel (26) deflecting the roller chain (24), - a first locking unit (28) formed from - a carrier unit (30) firmly connected to the roller chain (24), - a door connection (33) for connection to a door leaf, - a connecting element (32) extending along the roller chain (24), which is pivotally mounted at its first end on the driver unit (30) via a first pivot bearing (34) and at its second opposite end on the door connection (33) via a second pivot bearing (36). The first locking unit (28) is arranged such that, in a closed state, the two pivot bearings (34, 36) are arranged in an end position on the gearwheel (26) on a same circumferential half of the gearwheel (26) and thereby assume an over-center position relative to one another with respect to a direction of movement of the roller chain (26) in an open position.

Description

[0001] The present invention relates to a door drive for a door leaf, in particular for a vehicle door of a public transport vehicle. The invention is particularly suitable for single-leaf or double-leaf sliding or pivoting-sliding doors.

[0002] Door drives for motor vehicles or rail vehicles are well known. These drive systems can automatically move doors between an open and a closed position, with the open position opening a passage and the closed position blocking the passage.

[0003] For example, DE 10 2014 101 036 A1 discloses an automatic sliding door with a drive unit and at least one movable door leaf. The door leaf can be moved between an open and a closed position. The drive unit has at least one electric motor with a gearbox and an endless toothed belt, to which the door leaf is attached via carriers on one strand. The sliding door has a locking device with which the movable door leaf can be locked or unlocked. The locking device acts on the motor shaft of the drive motor.

[0004] In most cases, the door drives are located in the upper portal area and usually consist of toothed belts or spindle drives. Combining a locking device with door drives located there is often difficult and unreliable in the long run. Furthermore, the usable space above the door openings is significantly reduced, which is a disadvantage.

[0005] A further disadvantage is that installing an additional locking system is complex and expensive.

[0006] The object of the present invention is to create an alternative door drive for a door leaf of a sliding or pivoting sliding door that is as simple and compact as possible, yet still functions reliably over the long term. Furthermore, the door drive should be suitable for securely locking the door opening and be usable with single-leaf or double-leaf doors. In particular, the maintenance and repair costs should be minimal. Furthermore, the object of the invention is to propose a vehicle with a corresponding door drive.

[0007] According to the invention, the object is achieved by a door drive having the features of claim 1, a double-leaf door having the features of claim 11 and a vehicle having the features of claims 12 or 13.

[0008] Accordingly, a door drive according to the invention for a door leaf has a motor-driven roller chain that is deflected by a gear. A locking unit is attached to this roller chain for each door leaf, which locking unit can be moved with the roller chain and simultaneously moves the door leaf attached to it. For this purpose, the locking unit has a driver unit firmly connected to the roller chain, a door connection for connection to the door leaf, and a connecting element extending along the roller chain, which is pivotally mounted at its first end on the driver unit via a first pivot bearing and at its second opposite end on the door connection via a second pivot bearing. Due to the connection to the door connection, the locking unit also acts as a drive unit for the door leaf.

[0009] By moving the roller chain, the locking unit or the connecting element is moved into the area of the gear when moving from an open position to a closed position. The first pivot bearing, which connects the connecting element to the driver unit, moves along the outer circumference of the gear, starting from a straight roller chain path, preferably by at least approximately 95°, preferably approximately 100° around the gear. In the end position, which corresponds to the closed position of the door leaf, the second pivot bearing, which pivotally connects the connecting element to a door connection and is arranged behind the first pivot bearing in this direction of movement, is still in the linearly extending area of the roller chain in front of the gear. In the end position, the two pivot bearings are positioned such that they assume an over-dead center position relative to one another.This is achieved by positioning the gear's axis of rotation next to an imaginary connecting line between the two pivot bearings. In other words, the first pivot bearing is located below a center line of the gear that runs parallel to the linear section of the roller chain and through the center of the gear, while the second pivot bearing is still above this center line. In this position, moving the roller chain in the opposite direction, i.e. towards the open position, is not possible by pulling on the door leaf or the connecting element. In order to open the door leaf, the gear must first be turned back far enough until both pivot bearings are again above the imaginary center line.

[0010] In a particularly advantageous design variant, the gear is designed as a drive pinion for the roller chain. Alternatively, a corresponding drive pinion can be provided at another location along the roller chain; it is also conceivable to use multiple drive pinions that engage the roller chain at different points.

[0011] The locking action can preferably be further improved by the connecting element having a recess open toward the gearwheel, which, in the closed position of the locking unit, abuts against a retaining element connected to the gearwheel, effectively preventing a linear retraction of the connecting element. The recess is preferably arranged adjacent to the first pivot bearing and is designed as a semicircular recess, which, in the end position, abuts against a cylindrical retaining element protruding from the gearwheel. The semicircular recess and the cylindrical retaining element are coordinated with one another in terms of their radius and diameter.

[0012] In a particularly advantageous embodiment, the connecting element initially has a straight section extending from the second pivot bearing toward the first pivot bearing, followed by a second straight section angled toward the gear. The semicircular recess is located in the transition area between the two straight sections and directly adjacent to the second pivot bearing.

[0013] The connecting element can preferably be formed by two parallel side parts extending along the roller chain, which are connected to each other via a pivoting connecting pin. The two side parts are thus each located on one side of the roller chain, with the roller chain located between the two side parts. The connecting pin is arranged on the side of the roller chain opposite the gear and is aligned transversely to the direction of movement of the roller chain; it also serves as the second pivot bearing.

[0014] In a particularly preferred embodiment, additional bolts are located between the two side parts. The side parts are wider or higher than the width or height of the roller chain, respectively, so that the bolt(s) and the connecting bolt can extend past the roller chain. Alternatively, separate individual holding sections can be provided, extending in the direction away from the gear and having receptacles for the bolts and the connecting bolt.

[0015] The first pivot bearing is attached to at least one link of the roller chain, preferably via a spring clip connected to the links of the roller chain. Such a spring clip, for example, has laterally protruding flat plates, via which the chain link can be connected to external elements, in this case, to the pivot bearing. Only one, but preferably two, lateral flat plates can be provided.

[0016] In a particularly advantageous embodiment, an actuator is provided that is arranged so close to the gear that it can be contacted by the driver unit during its movement along the circumference of the gear toward the closed position. The actuator can be designed, for example, as a rotatably mounted lever that is pivoted or rotated by contact with the driver unit. This rotational movement can be used, for example, to drive another component or to operate a switch.

[0017] Preferably, the actuator can drive a locking bolt, which can serve as an additional locking mechanism for the door leaf. In the end position, the locking bolt is pushed into a corresponding opening or behind a retaining element in the door frame, securely locking the door or door leaf in the doorway.

[0018] The actuator has a contact area for contact with the driver unit and a drive lever, wherein the drive lever drives the locking bolt through the rotary movement of the actuator. Preferably, the contact area and the drive lever form an angle of approximately 90° in the direction of the gear. The actuator is arranged next to the gear in an extension of the longitudinal direction of the roller chain.

[0019] In a particularly advantageous design variant, the contact area faces the gear and is fork-shaped with two fork tines. The driver unit has a driving pin that is guided between the fork tines during the movement around the gear, thus driving the actuator along during the further movement. In the initial position, i.e., the open position, the fork-shaped contact area is aligned diagonally tangentially to the gear, so that the driving pin can be guided between the fork tines from above, so to speak, and out of them again during the return movement.

[0020] The roller chain can preferably have at least one, or if necessary several, tensioning elements along its length, by means of which the roller chain can be adjusted. The tensioning element facilitates adjustment, particularly when there are two door leaves during assembly. The end stops in the open and closed positions can be set using the adjustable tensioning element. This is important because the door leaves must be precisely aligned in their respective end positions. Due to manufacturing tolerances and different installation situations, subsequent adjustment of the end positions after installation of the door element using the tensioning element is very advantageous. In addition, the tensioning element can also be used to compensate for changes that occur during extended vehicle operation.On the one hand, the roller chains themselves can lengthen or stretch, and on the other hand, the car body can also deform during travel due to torsion, braking and acceleration.

[0021] Adjustment of the end positions can also be achieved, or additionally, via elongated holes that connect the various components of the door drive. Attaching the door leaves to the driver unit via elongated holes is particularly advantageous, as this ensures that the main closing edges of the door leaves meet properly in the closed position.

[0022] The invention is explained in more detail with reference to the following figures. The figures show only preferred embodiments and are not intended to limit the invention to them.

[0023] They show: Fig. 1: a door drive according to the invention for a double-leaf door in the open position, Fig. 2: the door drive according to the invention Fig. 1 in closed position, Fig. 3: a detailed view of a drive side of the door drive, Fig. 4: a detailed view of the drive side from Fig. 3 of the door drive without motor and bearing housing, Fig. 5: a detailed view of the drive side Fig. 3 of the door drive without motor and bearing housing in an intermediate position, Fig. 6: a detailed view of the drive side from Fig. 3 of the door drive without motor and bearing housing in locked state, Fig. 7: the door drive in perspective view. Fig. 8: a detailed view of a driver unit,

[0024] The figures show a door drive 20 for a door leaf (not shown). This drive is preferably arranged above a door opening (also not shown). A motor 22 drives a roller chain 24, which, in the illustrated embodiment, is deflected by a gear 26.

[0025] A locking unit 28 is arranged on the roller chain 24 and moves with the roller chain 24. The locking unit 28, in turn, has a driver unit 30 firmly connected to the roller chain 24 and a door connection 33 for connection to a door leaf. In the illustrated embodiment, two locking units 28 are shown, each connected to a door connection 33 and each driving a door leaf. Because both locking units 28 are attached to the same roller chain 24, synchronous movement of the two door leaves is always reliably guaranteed.

[0026] In the embodiment shown, the gear 26 is designed as a driving pinion which is driven by the motor 22.

[0027] Shown is a connecting element 32 extending along the roller chain 24, which is pivotally mounted with its first end on the driver unit 30 via a first pivot bearing 34 and with its second opposite end on the door connection 33 via a second pivot bearing 36. According to the invention, the two locking units 28 are arranged on the roller chain 24 such that, in a closed state, both pivot bearings 34, 36 are arranged in an end position on the gear 26 on the same circumferential half of the gear 26. This arrangement causes the locking units 28 to assume an over-center position relative to one another with respect to a direction of movement of the roller chain 24 into an open position. This end position is particularly Fig. 6. A dashed center line M is shown, which runs through the axis of rotation of the gear 26. Also shown is a solid connecting line V between the two pivot bearings 34, 36, which is arranged parallel and offset to this center line.

[0028] In particular, the Fig. 4 to 6 illustrate the function of the door drive 20 according to the invention starting from an open position ( Fig. 4) via an intermediate position, Fig. 5) into a closed position or end position ( Fig. 6). It can be seen that the connecting element 32 has a recess 38 adjacent to the first pivot bearing 34, which, in the closed position of the locking unit 28, rests against a holding element 40 connected to the gear 26.

[0029] In the illustrated embodiment, the recess 38 is semicircular, and the retaining element 40 has a circular outer circumference with a diameter corresponding to the recess 38. The retaining element 40 is designed as a laterally projecting stub shaft of the rotational axis of the gear 24. In the illustrated embodiment, the connecting element 32 is angled in the direction of the gear 26 in the region of the recess 38, which is advantageous with regard to the holding forces in the locked state and also with regard to the placement of the recess 38 on the retaining element 40.

[0030] The figures further illustrate that an actuator 50 and a locking bolt 56 together form an additional locking unit 58. For this purpose, the actuator 50 is arranged so close to the gear 26 that it can be contacted by the driver unit 30 during its movement along the circumference of the gear 26 toward the closed position. The actuator 50 is rotatably mounted, has a contact area 52 for contact with the driver unit 30, and a drive lever 54 for driving the locking bolt 56. The drive lever 54 thus drives the locking bolt 56 through the rotational movement of the actuator 50.

[0031] In the embodiment shown, the actuator 50 is V-shaped and encloses an angle of approximately 90° between the contact area 52 and the drive lever 54, wherein the rotatable bearing axis is arranged in the area of the intersection points of the two legs, the contact area 52 and the drive lever 54.

[0032] In the illustrated embodiment, the contact area faces the gear 26 and is fork-shaped with two fork tines 70. The driver unit 30 has a driver pin 72, which is guided between the fork tines 70 during the movement around the gear 26 and thus drives the actuator 50 along during the further movement. In the initial position, i.e., the open position, the fork-shaped contact area is oriented obliquely toward the approaching driver unit 30, so that the driver pin 72 can be guided from above between the fork tines 70 and out of them again during the return movement.

[0033] When the door leaf closes, the driver unit 30 moves to the end position, driving the actuator 50 with it, which moves the locking bolt 56 into its closed position. In the end position, the locking unit 28 is in the over-center position, and the locking bolt 56 additionally locks the door leaf.

[0034] Fig. Figure 7 shows the essential components of the door drive in a perspective view. It can be seen that the connecting element 32 has two side parts 42 aligned parallel to one another and extending along the roller chain 24 on one side of the roller chain 24. The side parts 42 are connected to one another via a pivotable connecting pin 44, wherein the connecting pin 44 is arranged on the side of the roller chain 24 opposite the gear 26 and is aligned transversely to the direction of movement of the roller chain 24. In the illustrated embodiment, the connecting pin 44 is arranged on the outside of the revolving roller chain 24; the roller chain 24 runs between the two side parts 42 and below the connecting pin 44. The connecting pin 44 forms the second pivot bearing 36 with the door connection 33.

[0035] For additional stability, the two side parts 42 are connected to each other via two additional bolts 60, which are arranged parallel to the connecting bolt 44. Depending on the design variant, only one or several additional bolts 60 may be provided.

[0036] The door connection 33 extends parallel to the roller chain 24 and can be connected to the door leaf via a suitable connection.

[0037] Fig. 8 shows a detailed view of the driver unit 30. This has a spring closure 62 with flat tabs 64, which are connected to each other via two axes 66.

[0038] The invention is not limited to the described embodiments, but also includes further embodiments that are covered by the claims. Reference symbol 20 door drive 22 Engine 24 roller chain 26 gear 28 Locking unit 30 Driver unit 32 connecting element 33 Door connection 34 first pivot bearing 36 second pivot bearing 38 recess 40 Holding element 42 side panels 44 connecting bolts 50 actuator 52 Contact area 54 drive levers 56 locking bolts 58 Additional locking unit 60 bolts 62 spring lock 64 flat tabs 66 axes 70 forks 72 driving pins M center line V connecting line QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2014 101 036 A1

[0003]

Claims

[1] Door drive (20) for a door leaf, comprising - a roller chain (24) driven by a motor (22), - a gear wheel (26) deflecting the roller chain (24), - a locking unit (28) formed from - a carrier unit (30) firmly connected to the roller chain (24), - a door connection (33) for connection to a door leaf, - a connecting element (32) extending along the roller chain (24), which is mounted with its first end pivotably on the driver unit (30) via a first pivot bearing (34) and with its second opposite end pivotably on the door connection (33) via a second pivot bearing (36), wherein the locking unit (28) is arranged such that, in a closed state, both pivot bearings (34, 36) are arranged in an end position on the gearwheel (26) on an identical circumferential half of the gearwheel (26) and thereby assume an over-center position relative to one another with respect to a direction of movement of the roller chain (26) into an open position. [2] Door drive (20) according to claim 1, characterized by that the gear (26) is designed as a drive pinion. [3] Door drive (20) according to claim 1 or claim 2, characterized bythat the connecting element (32) has a recess (38) adjacent to the first pivot bearing (34) which, in the closed position of the locking unit (28), bears against a holding element (40) connected to the gear (26). [4] Door drive (20) according to claim 3, characterized by that the recess (38) is semicircular and the holding element (40) has a circular outer circumference with a diameter corresponding to the recess (38), wherein the connecting element (32) is angled in the direction of the gear wheel (26) in the region of the recess (38). [5] Door drive (20) according to one of claims 1 to 4, characterized byin that the connecting element (32) has two side parts (42) which are aligned parallel to one another and each extend on one side of the roller chain (24) along the roller chain (24), which are connected to one another via a pivotable connecting pin (44), wherein the connecting pin (44) is arranged on the side of the roller chain (44) opposite the gear wheel (26) and is aligned transversely to the direction of movement of the roller chain (24) and forms the second pivot bearing (36). [6] Door drive (20) according to one of claims 1 to 5, characterized by that the first pivot bearing (34) is fastened to at least one chain link (46) of the roller chain (24). [7] Door drive (20) according to claim 6, characterized by that the first pivot bearing (34) is connected to chain links (46) of the roller chain (24) via a spring lock (48). [8] Door drive (20) according to one of claims 1 to 7, characterized bythat an actuator (50) is arranged so close to the gear (26) that it can be contacted by the driver unit (30) during its movement along the circumference of the gear (26) in the direction of the closed position. [9] Door drive (20) according to claim 7 or claim 8, characterized by in that the actuator (50) is rotatably mounted, has a contact area (52) for contact with the driver unit (30) and a drive lever (54), wherein the drive lever (54) drives a locking bolt (56) by the rotational movement of the actuator (50). [10] Door drive (20) according to claim 9, characterized by that the locking bolt (56) forms an additional locking unit (58). [11] Double-leaf door with a door drive (20) according to one of claims 1 to 10, characterized by that two locking units (28) are arranged on a single roller chain (24), each of which is connected to a different door leaf via its door connection (33). [12] Vehicle with a door drive according to one of claims 1 to 11. [13] Vehicle with a double door according to claim 12.

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