DE102017116435A1 - Linear drive with back rigid chain - Google Patents

Abstract

The present invention relates to a linear drive comprising a drive motor, a screw driven by the drive motor with helices and a first backstep chain, wherein the first back rigid chain has engagement means which engage with the helical groove to drive the first back stiffener chain. There is further provided a second back stiffener chain, the second back stiffener chain also having engagement means equally engaged with the helical groove of the auger to drive the second back stiffener chain in synchronism with the first back stiffener chain.

Description

The present invention relates to a linear drive comprising a drive motor, a screw driven by the drive motor with a helical groove and a first backstiffened chain, wherein the first back stiff chain has engagement means which engage with the helical groove to drive the first back stiffener chain.

From the publication DE 202 21 581 U1 an actuator is known in which a back-rigid chain is moved by means of a spindle driven by a motor. These actuators are used when opening and closing window sashes. The electric motor used is provided with a gear and drives an arranged in extension of the engine spindle. In this case, the back-rigid chain is arranged in the actuating element mainly in extension of the electric motor along the spindle, with which the chain is engaged. The lifting movement of this actuating element takes place substantially perpendicular to the spindle axis, wherein the back-rigid chain is deflected by the electric motor and guided to the outside, where the chain is then connected to the element to be actuated. This configuration results in a very slim shape of the actuator at a considerable length.

Another type of linear acting lifting drive is in the publications JP 2011/137514 A and JP 2011/144874 A shown, wherein two chain strands are brought together in the manner of a zipper principle and rigidly wedged into each other. The chains are driven by a sprocket which, depending on the positioning of the motor, can engage in different ways in the chain strands. In this case, the sprocket on a Fußkreisdurchmesser, which is greater than the width or the height of the associated motor. A sub-strand of the chain is deflected into a chain depot, which runs meandering on the side of the engine. The engagement in the chains takes place by means of a directly engaging in corresponding openings between the side plates sprocket or engaging in laterally projecting pin Triebstockrad.

From the publication EP 1859977 A2 For example, an actuation mechanism for a sun visor is known, which is moved by means of two chain strands. The chain strands are attached to two sides of the panel and are each driven by a worm. Since the two worms are driven by a motor, the helices of the worm are formed in opposite directions, whereby the two chain strands are deflected only after the engagement of the respective worm.

Known in the prior art linear drives with back rigid chain are relatively complex both in their construction, require a large amount of space and are also characterized by the use of special components.

It is therefore an object of the present invention to provide a linear drive of the type mentioned, which is inexpensive to produce and versatile with a simple and compact design and the use of standardized components.

In the linear drive according to the invention, a second back-rigid chain is provided, wherein the second back-rigid chain engagement means which are also engaged with the helical groove of the worm to drive the second back-rigid chain synchronously to the first back-stiffened chain. The paired arrangement of two back-stiff chains in a linear drive standardized, rigid push chains can be used and absorb the transverse forces acting in the linear drive. In this case, the engagement of the first and second back stiffener chain with corresponding engagement means in the helical groove of the same screw allows a synchronous drive, wherein the linear drive further manages with a single drive motor and a single driven screw. The limitation of the drive unit to a drive motor and a drivable screw for the first and second back stiff chain also reduces the space required for a linear drive according to the invention. In addition to the pairwise arrangement of the first and second spine chains in engagement with the helical groove of the worm, in addition to these two spine chains, further spine-resistant chains can be brought into engagement with the helical groove of the worm by means of corresponding engagement means and synchronously with the first and second drives in the linear drive according to the invention second back-stiffened chain to be driven.

In a preferred embodiment of the linear drive, the first back stiffener chain and the second back stiffener chain have alternating inner chain links and outer chain links interconnected by means of link pins, the stud axes of the link pins of the first backstep chain and the second backstep chain being guided in a common plane extending along or parallel to the geometric axis of the screw. Accordingly, the two back-rigid chains, starting from the region of engagement with the drive motor drivable screw to the connection to the actuated element no longer deflected out of this plane out, so that there is the possibility to apply along this plane directly over the helical groove of the screw thrust , Independent of the possibility of applying a thrust force in the direction of the plane running along or parallel to the geometric axis of the screw via the drive drivable by the drive motor, the leadership of the first and second spine chain in this common plane is also suitable for achieving a compact design, since the back stiff chains can move very close along the drive unit from drive motor and worm.

For secure reception of the transverse forces acting on the linear drive in different directions, the rigid rear side of the first backstay chain and the rigid back side of the second backstop chain can be arranged on different sides of the plane.

Conveniently, a rigid connecting element is provided, wherein the ends of the first back-rigid chain and the second back-rigid chain are connected to the connecting element. The pairwise arrangement of the first and second back stiffened chains on the connecting element not only allows the secure absorption of transverse forces, but also a bias of the first and second back stiffener chains to each other, wherein the bias acting in the two backrest chains bias can be adjusted individually. The provision of such a rigid connecting element facilitates the use of such a linear drive for stage or lifting devices, in which an unintentional occurrence of high shear forces is possible.

A particular embodiment of the linear drive according to the invention provides that the first back stiffener chain and the second back stiffener chain are guided outside of the screw and with their engagement means at least partially along the drive motor, wherein the core diameter of the screw is greater than twice the distance of the motor axis the motor outer sides, where the first back stiffener chain and the second back stiffener chain are guided along. This means that the area occupied by the drive motor of the linear drive is at least partially used at the same time also by the first and second backstep chain, whereby the linear drive, based on a specific chain length of the backrest chain, makes do with a total overall length. As a result, not only a guide and stiffening of the backstiffened chain perpendicular to the geometric axis of the screw is unnecessary, but it can also be a drive of the back-rigid chain along the screw.

Due to the fact that the back stiffener chains do not have to be deflected in such an embodiment in a shear force transmitting area, the wear of the linear drive can be kept low. Such a linear drive according to the invention enables the replacement of hydraulic or pneumatic cylinders by an electrically actuated drive motor. Under the core diameter of the screw in this context, the base or foot diameter of the introduced helical groove to understand. Furthermore, there are various ways in which the back stiff chains can come into engagement with their engagement means with the screw. The joint axes of the back-rigid chains can be aligned exactly perpendicular to the screw axis or at a distance offset from this axis.

In order to achieve a large reduction in length of such a linear drive, it is provided according to a variation that the first and second back stiffener chain over a length of the drive motor can be guided, which corresponds to at least 50% of the length, preferably at least 80% of the length of the drive motor. A considerable reduction in length occurs in particular when the thrust force is applied away from the drive motor, because then the non-pressurized length of the back-rigid chains can extend along the drive motor and does not lead to an overall extension of the linear drive.

In a further embodiment, a chain depot for the first spine chain and the second spine chain can be provided laterally along the drive motor, wherein the chain depots are each formed with at least two adjacent, preferably parallel, portions of the first spine chain or the second spine chain , These chain depots can each be designed as a total depot or as an intermediate depot for the first and second spine chains. In this case, the remote end of the back-rigid chains is preferably fastened in the region of the chain depots. Depending on the size and length of the drive motor, there are considerable storage capacities for the back stiff chain in the respective chain depots. Although this design may lead to a slightly wider configuration of the linear drive, but the overall length can be considerably shortened when retracted chains of the back stiff chains. Therefore, sections of the first and second spine chains, whose lengths correspond to at least 1.5 times the length of the drive motor, can advantageously be accommodated in the chain depots. The back-stiff chains are therefore in the chain depots meandering back and forth, which can also be done multiple times.

To limit the required designs for the linear drive and for the use of conventional drive motors, the geometric Axial of the worm be arranged coaxially to the motor axis, wherein the worm has an outer diameter which is greater than twice the distance of the motor axis to the motor outer side, on which one of the two back stiffener chains is guided along.

Since many commercially available drive motors have too high a speed and too little torque, the drive motor may be provided with a gear which is coupled to the worm. Preferably, the transmission leads to a reduction of the rotational movement and an increase in the torque, with common ratios of 4: 1 or 6: 1.

The worm drivable by the drive motor transmits by means of the helical groove, the force of the drive motor on the first and second back-rigid chain. So that the back-rigid chains are exposed to as little wear as possible, a reduction in friction can be achieved by a suitable choice of material of the screw. Conveniently, therefore, the worm may comprise a sleeve-shaped worm body and a non-rotatable drive shaft connected thereto. The screw body can thereby be made of a low-cost, easily machined material, such as a plastic, wherein the friction properties of the screw body can be selected according to the engagement means of the two back-rigid chains. Further, the screw body can be easily replaced with a problematic wear by a new screw body, which in turn is rotatably connected to the drive shaft.

In order to enable the use of common back stiffer chains, it is provided in particular that the first back stiffener chain and the second back stiffener chain at least at predetermined intervals and at least laterally projecting laterally projecting chain pins as engagement means such that a protruding part of the chain pin with the screw engaged is or can be brought. As a result, back-stiff chains can be used, in which only at least some of the chain pins are made longer. All other components of such conventional back stiffener chains can be maintained in a similar manner and require no adjustment.

In addition, it can be provided that the engagement means comprise elements for reducing friction in the form of at least one rotatable roller or a sliding shoe, which engage in the helical groove of the worm. Sliding shoes may for example have the shape of a key or the cross-sectional shape of an ellipse. Also, a height-convex feather key shape or elliptical shape can be used. All side surfaces can be made spherical. The rollers can be ball bearings or even ball bearings. The use of sintered rollers, which may be soaked in a lubricant, is also possible.

In a further embodiment, it is provided that the engagement means Elemtene for slip compensation in the form of several juxtaposed on a protruding chain pin rotatable rollers and / or a conical roller and a helical groove adapted thereto have. Due to differences in speed over the worm radius, slippage occurs at the contact points between roller and worm. If several shorter rollers are attached to an extended bolt, each roller will have a different speed. The slip is significantly reduced. With the aid of conicity on the rollers and the worm speed differences are compensated.

In a particular embodiment, it is provided that the first back stiffener chain and the second back stiffener chain are guided in the region of the screw in each case by means of a guide rail which has in each case one rear side facing away from the engagement sides of the chain and two outwardly facing sides. For such guide rails low-friction materials can be used and the guide rail itself be formed interchangeable. These guide rails offer the possibility of a targeted guidance and support of the first and second back-rigid chain, for example in a chain depot. The guide rails may also have rollers or wheels to reduce friction or be formed by rollers or wheels.

For the use of the linear drive according to the invention as an independent unit for different applications and as a replacement for hydraulic or pneumatic linear actuators, it is advantageous if the linear drive is a compact unit and designed as a self-supporting construction, which can be used independently of the corresponding application conditions as a modular module , For this purpose, it is provided according to a variant that a support structure with a base body and a first back stiffening chain and the second back stiffener chain bridging, arranged on the base body bearing plate is configured, wherein on one side of the bearing plate, the screw is mounted. The main body further allows the arrangement of the linear drive in various installation situations.

Furthermore, the support structure can bridge the backrest chains bridging front panel at the front end of the body and an end plate at the rear end of the base body, which are arranged substantially parallel to the bearing plate, and corresponding side parts, wherein the front plate, the bearing plate and the end plate are interconnected by means guided on the screw and the drive motor side parts of the base body. The front panel forms, possibly together with corresponding guide rails, an outlet for the actuating ends of the first and second backstifte chains, while all other components of the linear drive according to the invention within the support structure and are arranged protected. As a result, the possibly occurring by the Anbringsituation the linear drive forces can be absorbed and passed to the drive motor and the screw. The front panel can also be used as a second bearing plate for the screw.

In a compact embodiment of the linear drive, a cover may be provided which covers the open longitudinal sides of the support structure, wherein the worm, the drive motor and possibly the chain depots or the laterally guided on the screw and the drive motor sections of the first and second back-rigid chain between Base and cover are arranged. To prevent the entry of dirt, the bushings of the two back-rigid chains can be provided from the housing with specially shaped brushes. These brushes could also relubricate the back stiff chains including the friction reducing elements.

Furthermore, position elements which can be detected by means of one or more sensors can be attached to the first and second backstep chain, wherein the position elements are, for example, clipped into the backstacked chains. Such position elements can be used as reference points of the linear drive according to the invention, with the aid of which a subdivision of the entire drive path and an electronic control can be made possible.

In a further embodiment, the worm drivable by the drive motor with helical groove is designed as a hollow screw, wherein the first and second rigid back chain are passed through the hollow screw parallel to each other and driven by the inner helical groove. Such a hollow screw in addition to the other embodiments of the linear drive according to the invention allows a very narrow design.

In a further embodiment of the linear drive according to the invention, the first back stiffener chain can be connected to a first drive unit with drivable screw and the second back stiffener chain to a second drive unit with drivable screw, wherein the first back stiffener chain and second back stiffener chain driven synchronously and via a rigid connecting element connected to each other. As a connecting element, the platform could serve a lifting system at the corners of which at least the first and second back-rigid chain are fastened torsionally stiff to each other.

• 1 eine Seitenansicht eines erfindungsgemäßen Linearantriebs,
• 2 eine perspektivische Seitenansicht des Linearantriebs aus 1, wobei eine seitliche Abdeckung weggelassen worden ist,
• 3 die Seitenansicht des Linearantriebs aus 1 ohne Abdeckung,
• 4 eine geschnittene Seitenansicht des Linearantriebs aus 1,
• 5 eine Seitenansicht der wesentlichen Funktionsbestandteile des Linearantriebs,
• 6 eine vergrößerte Ansicht der Funktionsbestandteile entsprechend 4,
• 7 eine geschnittene Seitenansicht der Schnecke und der beiden rückensteifen Ketten,
• 8 eine vergrößerte Detailansicht des Ausschnitts VII aus 7,
• 9 eine geschnittene Seitenansicht einer anderen Ausführungsform der Schnecke und eines Eingriffsmittels der rückensteifen Ketten, und
• 10 eine vergrößerte perspektivische Darstellung eines Innenkettenglieds mit einem eingesetzten Positionierelement, wobei die vordere Innenlasche als durchsichtiges Element dargestellt ist.

In the following, an embodiment of the present invention will be explained in more detail with reference to drawings. Show it:

• 1 a side view of a linear drive according to the invention,
• 2 a perspective side view of the linear drive 1 wherein a side cover has been omitted,
• 3 the side view of the linear actuator 1 without cover,
• 4 a sectional side view of the linear drive 1 .
• 5 a side view of the essential functional components of the linear drive,
• 6 an enlarged view of the functional components accordingly 4 .
• 7 a sectional side view of the screw and the two back-stiff chains,
• 8th an enlarged detail view of the section VII 7 .
• 9 a sectional side view of another embodiment of the screw and an engagement means of the back stiffener chains, and
• 10 an enlarged perspective view of an inner chain link with an inserted positioning, wherein the front inner flap is shown as a transparent element.

The in 1 illustrated linear actuator 1 includes an elongated, cuboid housing 2 , as well as a first back stiff chain 3.1 and a second back stiff chain 3.2 which are stiffened in opposite pivot directions. At that the back stiff chains 3.1 and 3.2 opposite lower end of the housing 2 is a condyle 4 with ball joint for swivel mounting of the linear drive 1 intended. Instead of such a condyle 4 with ball joint can at the bottom 6 of the housing 2 numerous other mounting options for the linear drive 1 be provided, in addition to a pivotal attachment and a rigid attachment is possible. Also an immediate attachment to the housing 2 is conceivable. The back-stiff chains 3.1 and 3.2 drive at the front end, so the front 5 of the housing 2 , in and out. Next to the bottom 6 of the housing 2 bolted condyle 4 there is an electronic connection socket 7 for powering the linear drive 1 , The housing 2 includes next to the front panel 8th on the front side 5 and an end plate 9 on the bottom 6 also a cover 10 attached to a body 11 of the housing 2 screwed on.

The housing 2 includes a support structure, in addition to the front panel 8th and the end plate arranged parallel thereto 9 also the basic body 11 belongs. This is good in the perspective side view of the linear drive 1 in 2 to recognize. Furthermore, the load-bearing structure of the linear drive counts 1 also one between the front panel 8th and the end plate 9 arranged bearing plate 12 that are parallel and spaced from the front panel 8th and end plate 9 between the two side panels 13 and 14 of the basic body 11 extends. The side parts 13 . 14 are frontally with the front panel 8th and the end plate 9 as well as laterally with the bearing plate 12 screwed. The side parts 13 . 14 extend over the entire length between the front panel 8th and the end plate 9 , The cover 10 Accordingly, it serves merely to protect the components of the linear drive arranged within the support structure and described in more detail below 1 , Also on the back of the support structure, a corresponding cover 10 be arranged.

In the case 2 are an electric drive motor 15 and one with the drive motor 15 connected gearbox 16 arranged. The drive unit from drive motor 15 and gear 16 is between the bearing plate 12 and the end plate 9 arranged. These are drive motor 15 and gear 16 together by means of a flange 17 on the bearing plate 12 attached. The attachment of the drive motor 15 together with the gearbox 16 therefore takes place only on one side of the bearing plate 12 , for example by means of screws. The drive motor 15 is via corresponding electrical connections and electrical lines (not shown) to the electrical connection socket 7 on the end plate 9 connected. The gear 16 has in the present case a reduction of 4: 1, but other reductions are possible, for. Eg 6: 1 or 10: 1.

The from the front panel 8th escaping back stiffening chains 3.1 and 3.2 are at their projecting ends with a rigid connecting element 18 connected. Because the first back stiff chain 3.1 and the second back stiff chain 3.2 are stiffened in opposite pivot directions, allows the connection on the rigidly to the two backrest chains 3.1 and 3.2 fastened connecting element 18 in addition to that for a linear drive 1 necessary axial stiffness and the absorption of shear forces. To drive the two back-rigid chains 3.1 and 3.2 is between the front panel 8th and the bearing plate 12 a snail 19 Arranged over the gearbox 16 and the drive motor 15 is driven. The snail 19 is rotatably mounted, both in the bearing plate 12 as well as in the front panel 8th each a ball bearing for storage of the screw 19 is provided.

The snail 19 is constructed in two parts and comprises a screw body 20 and a drive shaft 21 extending through the sleeve-shaped screw body 20 extends and rotatably connected to this, see also 5 and 9 , The snail body 20 is made of a softer material than the drive shaft 21 , where both plastic with good sliding properties and softer metals, such as brass, can be used. The snail 19 has on its lateral surface or its outer circumference a circumferential helical groove 22 with a predetermined slope. The spiral groove 22 has a substantially rectangular cross-section. The drive shaft 21 is non-rotatable with the gear shaft 23 connected.

In the in 5 the embodiment shown is the motor axis A _M including the transmission axis A _G coaxial to the screw axis A _S arranged. A staggered arrangement is possible, but needs the space requirements of the linear drive 1 suffice. The diameter D _S the snail 19 is relatively large, so the outer circumference of the screw 19 the outer circumference of the drive motor 15 towered over, see also 6 , This must be at least on the sides of the drive motor 15 be the case, the first back-stiffened chain 3.1 and the second back-stiff chain 3.2 are facing. The snail 19 , or the screw body 20 , has a core diameter D _K on, which is also larger than the associated dimension of the drive motor 15 with gear 16 on the two back-stiff chains 3.1 and 3.2 facing sides.

With the two back-stiff chains 3.1 and 3.2 These are roller chains made of alternating inner chain links 24 and outside chain links 25 are constructed. In addition, there are between those in inner chain links 24 and the outside chain links 25 reinforcing tabs 26 arranged at the two back-stiffened chains 3.1 and 3.2 are each arranged in different pivot directions and ensure that at a substantially straight alignment of the backrest chains 3.1 and 3.2 a thrust force is safely transferable. In the other pivoting direction are the inner chain links 24 and the outer chain links 25 pivotable against each other.

To the outside chain links 25 each include the chain pin 27.1 and 27.2 , Production-related are all ends of the chain pins 27.1 and 27.2 at least slightly over, however, are the chain pins 27.1 much longer than the chain pins 27.2 trained so that they are in the direction of the snail 19 pointing side to form an intervention area 28 protrude. Accordingly, the engagement areas 28 in the spiral groove 22 the snail 19 engage while the shorter chain pins 24.2 not in the helical groove 22 can intervene. In the present embodiment, every second link pin is 27.1 executed so extended. The slope of the helical groove 22 corresponds approximately to the pitch of the back stiff chains 3.1 and 3.2 , For a good engagement between the snail 19 and the back-stiff chains 3.1 and 3.2 it is sufficient if every second chain pin 27.1 is extended.

The back-stiff chains 3.1 and 3.2 are aligned so that they are upright in the two side panels 13 . 14 of the basic body 11 are guided along. In the present embodiment, therefore, the chain longitudinal axes K _L the first back stiff chain 3.1 and the second back-stiff chain 3.2 parallel to the motor axis A _M , Transmission axis A _G and screw axis A _S aligned. In the intervention area 28 between the two back-stiff chains 3.1 . 3.2 and the snail 19 stand the bolt axes B _{1 of} the chain pin 27.1 essentially exactly perpendicular to the screw axis A _S , The back-stiff chains 3.1 and 3.2 be inside the case 2 once deflected, see also 6 , so in the area of the two side panels 13 and 14 of the basic body 11 one chain depot each 29 formed. In the present embodiment of the linear drive 1 exist the chain depots 29 each of two mutually parallel chain strands and the associated deflection. In the retracted state of the linear drive 1 is located in the chain depots 29 therefore each one chain length of the backrest chain 3.1 and 3.2 greater than 1.5 times the total length of drive motor drive unit 15 and gear 16 ,

The deflection of the back stiff chains 3.1 and 3.2 naturally takes place about the axes of the chain pins in the respective pivoting direction of the back-rigid chains 3.1 and 3.2 so the back-resistant chains 3.1 and 3.2 essentially in a plane (a plane perpendicular to the plane of the drawing 5 on the chain longitudinal axes K _L runs and there parallel to the motor axis A _M , the transmission axis A _G and the screw axis A _S is aligned). Like any necklace, the two back-stiff chains can do the same 3.1 and 3.2 in the chain joints have a game, so that the above presentation is an idealized approach. As a result, the arrangement of the two back-rigid chains leads 3.1 . 3.2 to that the front area, ie the actual operating area of the back-stiff chains 3.1 . 3.2 , centrally guided and only at the bottom of the case 2 is offset to the outside.

As in particular in the 2 The front panel is easy to recognize 8th two window openings 31 on, through which the two stiffened chains 3.1 . 3.2 can move in and out. Next can be in 2 and the 3 recognize that the side panels 13 and 14 of the basic body 11 from the inside have a recessed groove structure, so that the back-rigid chains 3.1 . 3.2 can move within this groove structure. The utility structure is at the lower end of the housing 2 configured such that in this recessed groove structure the chain depots 29 form. Within this recessed groove structure guide rails can be used both at the bottom and at the side walls 32 (please refer 4 ) are introduced with a low coefficient of friction, with the respective underside and the front and back sides of the back-rigid chains 3.1 and 3.2 come to the plant. These guide rails 32 can be designed interchangeable.

Based on 4 , a longitudinal section through the side part 14 of the basic body 11 to expose the second back stiffener chain 3.2 , is further to realize that the last link of the back-rigid chain 3.2 that within the chain depot 29 is arranged with a bolt 33 on the side panel 14 is attached. Furthermore, a chain sensor 34 provided over which the positions of the back-stiff chain 3.2 can be determined and the drive motor 15 can be switched off when reaching the end position. The chain sensor 34 can via a corresponding electrical connection cable (not shown) to the connector socket 7 be connected to transmit the respective signals. In 10 is an inner chain link 24 shown in between the rollers 35 of the inner chain link a positioning element 36 is embedded. The positioning element 36 has a plastic holder 37 and a cylindrical permanent magnet 38 on. The plastic holder 37 is the space between the rollers 35 adapted and resiliently clipped into this space. The positioning element 36 is located on an inner chain link 24 that is both an end position and / or an intermediate position of the linear drive 1 can specify. The chain sensor 34 detects the permanent magnet 38 and optionally switches the drive motor 15 from.

The following describes the mode of action and operation of the above-described linear drive according to the invention 1 with two back-stiff chains 3.1 . 3.2 explained in more detail.

The linear drive 1 has such a design and performance that make it possible the linear drive according to the invention 1 to be used for certain applications as an alternative to hydraulic and pneumatic cylinders. The two back-stiff chains 3.1 . 3.2 are at theirs on the front panel 8th protruding ends via the connecting element 18 firmly connected to each other, wherein the connecting element 18 through corresponding safety bolts 30 with those at the end of the back-stiff chains 3.1 . 3.2 protruding inner chain links 24 is fixed torsion-free. Because the first back stiff chain 3.1 and the second back stiff chain 3.2 by the appropriate orientation of the stiffening tabs 26 can only move in each case in different pivot directions, causes the connecting element 18 a stiff connection of the two back-stiff chains 3.1 . 3.2 , whereby not only a linear movement of the interconnected first and second back stiff chains 3.1 and 3.2 in the direction of the motor axis A _M , the transmission axis A _G and the screw axis A _S is ensured, but also the absorption of lateral forces and an increase of the means of the linear drive according to the invention 1 movable load is possible. Next allows the fixation of the connecting element 18 by means of the safety bolts 30 on the first back-stiff chain 3.1 and the second back-stiff chain 3.2 the application of a preload in the back stiff chains 3.1 . 3.2 ,

The linear drive according to the invention 1 allows alternatively to hydraulic or pneumatic cylinders, the application of a thrust force on an element to be moved. This is the connecting element 18 connected to a correspondingly actuated element, such as stage and lifting devices, but also windows, doors or gates, etc. The 1 to 4 show a substantially retracted position of the linear drive 1 , The lower end of the linear drive 1 is done with the help of the condyle 4 with ball joint attached to a dedicated axle. The condyle 4 with ball joint allows pivoting in two axes, similar to that known in the arrangement of hydraulic and pneumatic cylinders. Instead of elaborate hydraulic or pneumatic circuits, this electrically powered linear drive needs 1 only be connected to the power supply and possibly control electronics. The connection socket serves for this purpose 7 , In use, the drive motor drives 15 with its motor shaft via the reduction of the gearbox 16 the snail 19 at. By the rotation of the screw 19 become the back stiff chains 3.1 and 3.2 by means of the engagement of the longer chain pins 27.1 in the spiral groove 22 out of the case 2 moved out or in. Accordingly, with the connecting element 18 connected element actuated. The operation of the drive motor 15 takes place until the corresponding desired length of the back-rigid chains 3.1 . 3.2 is extended. By the self-locking of the snail 19 is for the linear drive according to the invention 1 a brake mechanism is not mandatory. The arrangement of the back stiff chains 3.1 and 3.2 in the chain depots 29 takes place during retraction and extension of the back-rigid chains 3.1 . 3.2 automatically, because the chain joints of the back-stiff chains 3.1 . 3.2 through the stiffening tabs 26 just let it move in a swivel direction.

Because the two unloaded ends of the back stiff chains 3.1 and 3.2 laterally on the drive unit of drive motor 15 , Gearbox 16 and the flange 17 be passed, ie in the area between the bearing plate 12 and the end plate 9 , and the unloaded links of the back stiff chains 3.1 . 3.2 in the chain depots 29 be recorded, a considerable stroke can be realized without the housing 2 must have a long length. Only for the storage and guidance of the back stiff chains 3.1 . 3.2 requires the housing 2 a certain width and height. Due to the compact design of the housing 2 open up for a linear drive according to the invention 1 with two stiffened back-stiff chains 3.1 . 3.2 completely new and varied applications. The modular design of the linear drive 1 offers meaningful solutions for a wide variety of applications, without the need for special designs. The special interaction of the diameter D _S the snail 19 the intervention areas 28 the back-stiff chains 3.1 . 3.2 and the outer dimensions of the drive unit from the drive motor 15 and gear 16 allows the significant advantages of the invention, electrically driven linear drive 1 , The two backrest chains can do this 3.1 and 3.2 run in the thrust region in a single plane, so that in the thrust area, in particular on a deflection and an offset of the back-rigid chains 3.1 . 3.2 can be waived. A deflection is rather in the unloaded sections of the back-rigid chains 3.1 . 3.2 in the field of chain depots 29 , ie side of the drive motor 15 and the transmission 16 ,

In the 7 illustrated snail 19 shows compared to the in the 1 to 6 shown embodiment, a slightly deeper helical groove 22 on. The ones with this deeper spiral groove 22 engaged chain pins 27.1 the first and second back stiff chain 3.1 and 3.2 are designed accordingly longer. On the opposite the outside chain links 25 protruding portion of the chain pin 27.1 are each three rotatable rollers 39 positioned and by means of a lock washer 40 secured. The roles 39 stand with the driven flank of the helical groove 22 in contact and act as elements to reduce friction. Rolls are used 39 from correspondingly low-friction materials, For example, plastic or lubricant-impregnated porous materials (eg sintered rollers). As in the 7 and 8th shown, is preferably a subdivision into several roles 39 so that they also serve as an anti-slip element at the same time as those inside the helical groove 22 depending on the diameter present different speeds at least partially compensate. This allows the wear on the rollers 39 reduce accordingly. The in the 7 and 8th illustrated variant may be alternative to the back-rigid chains 3.1 and 3.2 as well as the snail 19 be used from the previous embodiment.

Based on 9 is another alternative of a friction and slip engagement of the operating range of the back stiffener chains 3.1 and 3.2 to the embodiment of the 7 and 8th shown. Instead of three juxtaposed rolls 39 becomes a single role in this embodiment 41 used, which rotatably on the protruding chain pin 27.1 is arranged. The role 41 is conical and engages in a corresponding trapezoidal helical groove 22 one. The conical role 41 serves as an element for reducing friction. Due to the conical shape of the roll 41 and the adapted shape of the helical groove 22 At the same time, this construction serves as a slip compensation element because of the conical roller 41 the speed differences within the helical groove 22 compensate.

LIST OF REFERENCE NUMBERS

1

linear actuator

2

casing

3.1

first back stiff chain

3.2

second back stiff chain

4

joint head

5

front

6

bottom

7

socket

8th

front panel

9

endplate

10

cover

11

body

12

bearing plate

13

side panel

14

side panel

15

drive motor

16

transmission

17

flange

18

connecting member

19

slug

20

screw body

21

drive shaft

22

helical

23

gear shaft

24

Inner link

25

Outer chain link

26

reinforcing tabs

27.1 and 27.2

chain pins

28

engagement area

29

chain depot

30

safety bolt

31

Window breakthrough

32

guide rail

33

bolts

34

chain sensor

35

role

36

positioning

37

Plastic holder

38

permanent magnet

39

role

40

lock washer

41

conical role

M _A

Distance to the outside of the engine

K _L

chain longitudinal axis

A _M

motor axis

A _G

Drive shaft

A _S

screw axis

D _K

core diameter

D _S

Screw diameter

B _A

pin axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The 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

• DE 20221581 U1 [0002]
• JP 2011137514 A [0003]
• JP 2011144874 A [0003]
• EP 1859977 A2 [0004]

Claims (12)

Linear drive (1) with a drive motor (15), a drive by the drive motor (15) driven screw (19) with helical groove (22) and a first back stiffener chain (3.1), wherein the first back stiffener chain (3.1) engaging means, with the Spiral groove (22) are engaged to drive the first back stiffener chain (3.1), characterized in that a second back stiffener chain (3.2) is provided, wherein the second back stiffener chain (3.2) comprises engagement means, which also with the helical groove (22 ) of the worm (19) are engaged in order to drive the second back-rigid chain (3.2) in synchronism with the first backstiffened chain (3.1). Linear drive (1) to Claim 1 , characterized in that the first back stiffener chain (3.1) and the second back stiffener chain (3.2) have mutually alternating inner chain links (24) and outer chain links (25) interconnected by means of link pins (27.1, 27.2), the pin axles (B _A ) the chain pin (27.1,27.2) of the first backstiffened chain (3.1) and the second backstiffened chain (3.2) are guided in a common plane which extends along or parallel to the geometric axis (A _S ) of the screw (19). Linear drive (1) to Claim 2 , characterized in that the rigid back side of the first backstiffened chain (3.1) and the rigid back side of the second backstep chain (3.2) are arranged on different sides of the common plane. Linear drive (1) according to one of Claims 1 to 3 , characterized in that a rigid connecting element (18) is provided and the ends of the first back stiffener chain (3.1) and the second back stiffener chain (3.2) are connected to the connecting element (18). Linear drive (1) according to one of Claims 1 to 4 , characterized in that the first back stiffener chain (3.1) and the second back stiffener chain (3.2) on the outside of the screw (19) and with their engagement means at least partially along the drive motor (15) are guided, wherein the core diameter (D _K ) of the screw (19) each greater than twice the distance of the motor axis (A _M ) to the motor outer sides, at which the first back stiffener chain (3.1) and the second back stiffener chain (3.2) are guided along. Linear drive (1) to Claim 5 , characterized in that laterally along the drive motor (15) is provided in each case a chain depot (29) for the first back stiffener chain (3.1) and the second back stiffener chain (3.2), wherein the chain depots (29) each with at least two adjacent, preferably parallel, portions of the first back-stiffened chain (3.1) or the second back-stiffening chain (3.2) are formed. Linear drive (1) according to any one of the preceding claims, characterized in that a transmission (16) is provided, and the drive motor (15) by means of the transmission (16) with the worm (19) is coupled. Linear drive (1) according to one of the preceding claims, characterized in that the worm (19) has a sleeve-shaped worm body (20) and a non-rotatably connected thereto drive shaft (21). Linear drive (1) according to one of the preceding claims, characterized in that the first back stiffener chain (3.1) and the second back stiffener chain (3.2) at least at predetermined intervals and at least laterally projecting laterally projecting chain pins (27.1) as engagement means such that a protruding Part of the chain pin (27.1) with the screw (19) is engaged or can be brought. Linear drive (1) according to one of the preceding claims, characterized in that the engagement means comprise elements for reducing friction in the form of at least one rotatable roller (35,41) or a sliding shoe, which engage in the helical groove (22) of the worm (19) , Linear drive (1) according to one of the preceding claims, characterized in that the first back stiffener chain (3.1) and the second back stiffener chain (3.2) in the region of the screw (19) are each guided by a guide rail (32), each one of Side facing away from the side and has two outwardly facing sides. Linear drive (1) according to one of the preceding claims, characterized in that a support structure with a base body (11) and a first back stiffener chain (3.1) and second back stiffener chain (3.2) bridging, on the base body (11) arranged bearing plate (12 ) is provided, wherein on one side of the bearing plate (12), the screw (19) is mounted.

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