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

Abstract

Door drive (20) for one door leaf, comprising - a roller chain (24) driven by a motor (22), - a gear (26) that deflects the roller chain (24), - a locking unit (28) formed from - a drive unit (30) permanently connected to the roller chain (24), - a door connection (33) for connection with a door leaf, - a connecting element (32) extending along the roller chain (24), which is pivotably mounted at its first end via a first pivot bearing (34) on the drive unit (30) and at its second opposite end via a second pivot bearing (36) pivotably mounted on the door connection (33), 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 gear (26) on an equal circumferential half of the gear (26) and thereby assume an over-center position relative to each other with respect to a direction of movement of the roller chain (24) into 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 swing-sliding doors.

[0002] Door drives for motor vehicles or rail vehicles are generally known. These known door drives allow the door to be automatically moved between an open and a closed position, with the passage being open in the open position and blocked in the closed position.

[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 is movable between an open and a closed position. The drive unit has at least one electric motor with gearbox and an endless toothed belt to which the door leaf is attached via carriers on a track. The sliding door has a locking device with which the movable door leaf can be locked or unlocked, the locking device acting on the motor shaft of the drive motor.

[0004] A swing-sliding door for vehicles is also known from DE 197 35181 A1. A door leaf can be swung out of a door opening by means of a pivoting mechanism and moved into an open position next to the door opening by means of a sliding drive. The pivoting mechanism and the sliding drive are moved by a planetary gear system, which can be driven by a single drive motor. The safety of this drive system could be improved.

[0005] 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 mechanism with door drives positioned 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.

[0006] Another disadvantage is that installing an additional locking system is complex and costly.

[0007] The object of the present invention is to provide an alternative door drive for a door leaf of a sliding or swing-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 effort required for maintenance and servicing should also be minimal. It is also an object of the invention to propose a vehicle equipped with a corresponding door drive.

[0008] According to the invention, the problem is solved by a door drive with the features of claim 1, a double-leaf door with the features of claim 11 and a vehicle with the features of claims 12 or 13.

[0009] According to the invention, a door drive for a door leaf comprises a roller chain driven by a motor, which is deflected by a gear. A locking unit, movable along with the roller chain, is attached to each door leaf and simultaneously moves the attached door leaf. For this purpose, the locking unit has a drive unit fixedly connected to the roller chain, a door connection for linking it to the door leaf, and a connecting element extending along the roller chain. The connecting element is pivotally mounted at its first end on the drive unit via a first pivot bearing and at its second, opposite end, pivotally mounted on the door connection via a second pivot bearing. Through its connection to the door connection, the locking unit also acts as a drive unit for the door leaf.

[0010] By means of the roller chain, the locking unit or connecting element is moved into the area of ​​the gear when moving from an open to a closed position. The first pivot bearing, which connects the connecting element to the drive 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 hinge and is arranged behind the first pivot bearing in this direction of movement, is still located in the linearly extending section of the roller chain in front of the gear. In the end position, the two pivot bearings are positioned such that they are in an over-center position relative to each other.This is achieved by positioning the gear's axis of rotation next to an imaginary line extending 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 gear's center point, 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. To open the door leaf, the gear must first be rotated back until both pivot bearings are again above the imaginary center line.

[0011] In a particularly advantageous embodiment, the gear is designed as a drive pinion for the roller chain. Alternatively, a corresponding drive pinion can be provided at another point along the roller chain; it is also conceivable to use several drive pinions that engage with the roller chain at different points.

[0012] The locking mechanism can preferably be further improved by providing the connecting element with a recess open towards the gear. In the closed position of the locking unit, this recess abuts a retaining element connected to the gear, effectively preventing linear retraction of the connecting element. The recess is preferably located adjacent to the first pivot bearing and is designed as a semicircular recess that, in its end position, abuts a cylindrical retaining element projecting from the gear. The semicircular recess and the cylindrical retaining element are matched to each other with respect to their radius and diameter, respectively.

[0013] In a particularly advantageous embodiment, the connecting element, extending from the second pivot bearing towards the first pivot bearing, initially has a straight section, followed by a second straight section angled towards the gear. The semicircular recess is located in the transition area between the two straight sections and directly adjacent to the second pivot bearing.

[0014] The connecting element can preferably be formed by two side parts aligned parallel to each other and extending along the roller chain, which are connected to each other by a pivotable connecting bolt. The two side parts are thus each located on one side of the roller chain, with the roller chain situated between the two side parts. The connecting bolt is located on the side of the roller chain opposite the sprocket and is oriented transversely to the direction of movement of the roller chain; it simultaneously serves as the second pivot bearing.

[0015] In a particularly preferred embodiment, additional bolts are located between the two side parts. The side parts are wider or taller than the width or height of the roller chain, so that the bolt(s) and the connecting bolt can extend past the roller chain. Alternatively, separate individual retaining sections can be provided, extending in the direction away from the gear and featuring receptacles for the bolt(s) and the connecting bolt.

[0016] The first pivot bearing is attached to at least one chain link of the roller chain, preferably via a spring-loaded fastener connected to chain links of the roller chain. Such a spring-loaded fastener has, for example, laterally projecting flat tabs by which the chain link can be connected to external elements, in this case, the pivot bearing. Only one, but preferably two, lateral flat tabs may be provided.

[0017] In a particularly advantageous embodiment, an actuator is provided that is positioned so close to the gear that it can be contacted by the drive unit during its movement along the circumference of the gear in the direction of the closed position. The actuator can, for example, be designed as a rotatably mounted lever that is pivoted or rotated by contact with the drive unit. This rotational movement can be used, for example, to drive another component or to actuate a switch.

[0018] Preferably, the actuator can drive a locking bolt that can serve as an additional lock for the door leaf. In the end position, the locking bolt is thus pushed into a corresponding opening or behind a retaining element in the door frame and securely locks the door or door leaf in the doorway.

[0019] The actuator has a contact area for contact with the drive unit and a drive lever, the drive lever being driven by the rotary movement of the actuator to drive the locking bolt. 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, extending along the longitudinal direction of the roller chain.

[0020] In a particularly advantageous embodiment, the contact area faces the gear and is fork-shaped with two prongs. The drive unit has a drive pin that, during movement around the gear, is guided between the prongs, thus driving the actuator along during further movement. In the starting position, i.e., the open position, the fork-shaped contact area is oriented obliquely tangentially to the gear, so that the drive pin can be guided between the prongs from above and, during the return movement, out of them again.

[0021] Preferably, the roller chain can have at least one, and possibly several, tensioning elements along its length, allowing the chain to be adjusted. The tensioning element facilitates adjustment, particularly when installing two door leaves. The adjustable tensioning element allows the end stops to be set in both the open and closed positions. This is important because the door leaves must be precisely aligned in their respective end positions. Due to manufacturing tolerances and varying installation situations, subsequent adjustment of the end positions after installation of the door assembly using the tensioning element is highly advantageous. Furthermore, the tensioning element can also compensate for changes that occur over an extended period of vehicle operation.Firstly, the roller chains themselves can lengthen or stretch, and secondly, the car body can also deform during journeys due to torsion, braking and acceleration.

[0022] The end positions can also be adjusted, or additionally adjusted, via elongated holes through which the various components of the door drive are connected. In particular, attaching the door leaves to the drive unit via elongated holes is advantageous, as this ensures that the main closing edges of the door leaves meet correctly in the closed position.

[0023] 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 these.

[0024] 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 made of Fig. 1 in closed position, Fig. 3: A detailed view of one drive side of the door drive, Fig. 4: a detailed view of the drive side 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 Fig. 3 of the door drive without motor and bearing housing in the locked state, Fig. 7: the door drive in perspective view. Fig. 8: a detailed view of a drive unit,

[0025] The figures show a door drive 20 for a door leaf (not shown). This is preferably arranged above a door opening (also not shown). A motor 22 drives a roller chain 24, the roller chain 24 being deflected via a gear 26 in the illustrated embodiment.

[0026] A locking unit 28, which moves with the roller chain 24, is arranged on the roller chain 24. The locking unit 28, in turn, has a drive unit 30 fixedly 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 ensured.

[0027] In the illustrated embodiment, the gear 26 is designed as a driving pinion, which is driven by the motor 22.

[0028] Shown is a connecting element 32 extending along the roller chain 24, which is pivotably mounted at its first end on the drive 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. 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 and 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 each other with respect to a direction of movement of the roller chain 24 in an open position. This end position is particularly advantageous in Fig. Figure 6 shows a dashed center line M, 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 from this center line.

[0029] Especially the Fig. 4, Fig. 5 to Fig. Figure 6 illustrates 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 adjacent to the first pivot bearing 34 has a recess 38 which, in the closed position of the locking unit 28, rests against a retaining element 40 connected to the gear 26.

[0030] 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 axle of the rotation axis of the gear 26. In the illustrated embodiment, the connecting element 32 is angled in the region of the recess 38 towards the gear 26, which is advantageous with regard to the holding forces in the locked state and also with regard to the insertion of the recess 38 onto the retaining element 40.

[0031] 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 drive unit 30 during its movement along the circumference of the gear 26 in the direction of the closed position. The actuator 50 is rotatably mounted, has a contact area 52 for contact with the drive 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.

[0032] In the illustrated embodiment, the actuator 50 is V-shaped and forms an angle of approximately 90° between the contact area 52 and the drive lever 54, with the rotatable bearing axis being located in the area of ​​the intersection points of the two legs, the contact area 52 and the drive lever 54.

[0033] In the illustrated embodiment, the contact area faces the gear 26 and is fork-shaped with two fork tines 70. The drive unit 30 has a drive pin 72 which, during movement around the gear 26, is guided between the fork tines 70 and thus drives the actuator 50 along during further movement. In the starting position, i.e., the open position, the fork-shaped contact area is oriented obliquely towards the approaching drive unit 30, so that the drive pin 72 can be guided between the fork tines 70 from above and, during the return movement, out of them again.

[0034] As the door leaf closes, the follower unit 30 moves into its end position, thereby engaging the actuator 50, which moves the locking bolt 56 into its locked 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.

[0035] 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 each other and each extending along the roller chain 24 on one side of the roller chain 24. The side parts 42 are connected to each other via a pivotable connecting bolt 44, which is arranged on the side of the roller chain 24 opposite the gear 26 and is oriented transversely to the direction of movement of the roller chain 24. In the illustrated embodiment, the connecting bolt 44 is arranged on the outside of the circulating roller chain 24, which runs between the two side parts 42 and below the connecting bolt 44. The connecting bolt 44 forms the second pivot bearing 36 with the door connection 33.

[0036] For added stability, the two side parts 42 are connected to each other by two further bolts 60, which are arranged parallel to the connecting bolt 44. Depending on the design variant, there may be only one or more additional bolts 60.

[0037] The door connection 33 extends parallel to the roller chain 24 and can be connected to the door leaf via a suitable connection.

[0038] Fig. Figure 8 shows a detailed view of the drive unit 30. This has a spring lock 62 with flat tabs 64, which are connected to each other via two axes 66.

[0039] The invention is not limited to the described embodiments, but also includes further embodiment variants which are covered by the claims. Reference sign 20 Door drive 22 Engine 24 roller chain 26 gear 28 locking unit 30 drive unit 32 Connecting element 33 Door connection 34 first swivel bearing 36 second swivel bearing 38 Exclusion 40 retaining 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 fork tines 72 drive bolts M Center line V connecting line

Claims

[1] Door drive (20) for one door leaf, comprising - a roller chain (24) driven by a motor (22), - a gear (26) that deflects the roller chain (24), - a locking unit (28) formed from - a drive unit (30) permanently connected to the roller chain (24), - a door connection (33) for connection with a door leaf, - a connecting element (32) extending along the roller chain (24), which is pivotably mounted at its first end via a first pivot bearing (34) on the drive unit (30) and at its second opposite end via a second pivot bearing (36) pivotably mounted on the door connection (33), 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 gear (26) on an equal circumferential half of the gear (26) and thereby assume an over-center position relative to each other with respect to a direction of movement of the roller chain (24) 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 by, that the connecting element (32) adjacent to the first pivot bearing (34) has a recess (38) which, in the closed position of the locking unit (28), rests against a retaining 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 retaining element (40) has a circular outer circumference with a diameter corresponding to the recess (38), wherein the connecting element (32) is angled in the area of ​​the recess (38) in the direction of the gear (26). [5] Door drive (20) according to one of claims 1 to 4, characterized by, that the connecting element (32) has two side parts (42) aligned parallel to each other and extending along the roller chain (24) on one side of the roller chain (24), which are connected to each other via a pivotable connecting bolt (44), wherein the connecting bolt (44) is arranged on the side of the roller chain (44) opposite the gear (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 attached 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 via a spring lock (48) to chain links (46) of the roller chain (24). [8] Door drive (20) according to one of claims 1 to 7, characterized by, that an actuator (50) is arranged so close to the gear (26) that it can be contacted by the drive 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 , that the actuator (50) is rotatably mounted, has a contact area (52) for contact with the drive unit (30) and a drive lever (54), wherein the drive lever (54) drives a locking bolt (56) by the rotary 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 any one of claims 1 to 11. [13] Vehicle with a double-leaf door according to claim 12.

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