EP0957270A2 - Pivot drive for actuating a fitting - Google Patents

Abstract

The shaft - vane unit (3) comprises a core part, produced from a fibreglass-reinforced plastic with high strength and on all surface areas forming a limitation of a chamber (16) is provided with a covering of rubber-elastic plastic, out of which sealing lips (28',28'') are formed in one piece. Dividing walls (14) on their upper and lower sides on both sides of a circulating seal (20) are provided with a nose formation (49). These formations engage in matching cavities in the face wall of the housing (2).

Description

The invention relates to a rotary actuator for actuating a valve with a cylindrical, two-part sealed housing and one in it coaxial shaft-wing unit, which with a coaxial shaft of the actuating valve can be coupled torque-proof and from one side in the Housing mounted shaft and two with respect to their parallel to the axis of rotation The central planes running through the shaft are offset by 180 ° and with the shaft connected wings, which are each over the entire height of an interior of the housing and with a radially outer end face to an inner extend cylindrical surface of the housing, the housing two fixed radial and parallel to the axis of rotation partition planes offset by 180 ° to the shaft has, each over the entire height of the interior of the housing and from the inner cylindrical surface of the housing to an outer Shell surface of the shaft and extend the interior of the housing together with divide the wings into four compartments, two of which are not adjacent Chambers through the shaft penetrating channels are interconnected, and furthermore two adjacent chambers each with an inflow and outflow connection are provided, which can be alternately connected to a pressure medium source are.

Rotary Vane Actuators" der Firma Reuter Manufacturing bekannt. Auch wenn sich der bekannte Schwenkantrieb angeblich sowohl für eine hydraulische als auch eine pneumatische Betätigung eignen soll, stellt insbesondere bei einer pneumatischen Betätigung die Abdichtung der Kammern im Bereich der sich drehenden Flügel aufgrund der sehr niedrigen Viskosität von Luft ein erhebliches Problem dar. Dieses Dichtheitsproblem ist deshalb um so schwerwiegender, weil bei einer pneumatischen Betätigung derartiger Schwenkantriebe der Druck des Fluids nach Erreichen der jeweiligen Endlage des Antriebs bis zur nächsten Betätigung aufrechterhalten bleibt. Aus diesem Grunde führen Leckageraten, die bei einer nur kurzzeitigen Druckbeaufschlagung eventuell noch akzeptabel wären, über einen längeren Zeitraum betrachtet zu nicht mehr hinnehmbaren Druckluftverlusten. In der Praxis haben sich daher die bekannten Drehflügelschwenkantriebe insbesondere wegen ihrer unbefriedigenden Abdichtung im Bereich der Flügelstirnseiten, die mit Hilfe von mehreren in Nuten eingelegten Dichtstreifenelementen erfolgt, für eine pneumatische Betätigung nicht durchsetzen können. Lediglich bei einer hydraulischen Betätigung konnte eine zufriedenstellende Dichtigkeit erzielt werden. Doch auch hier liegt ein erheblicher Nachteil der bekannten Schwenkantriebe in ihrer vergleichsweise aufwendigen und teuren Herstellung.Such a device, which is referred to as a swing-wing swivel drive, is, for example, from the prospectus

Rotary Vane Actuators "from Reuter Manufacturing. Even if the known swivel drive is said to be suitable for both hydraulic and pneumatic actuation, the sealing of the chambers in the area of the rotating vanes, particularly in the case of pneumatic actuation, is due to the very low viscosity This tightness problem is all the more serious because with pneumatic actuation of such swivel drives, the pressure of the fluid is maintained after the respective end position of the drive has been reached until the next actuation short-term pressurization might still be acceptable, viewed over a longer period of time to unacceptable compressed air losses. In practice, therefore, the known rotary swing actuators have become particularly popular because of their unsatisfactory sealing h of the wing end faces, which is carried out with the aid of several sealing strip elements inserted in grooves, for pneumatic actuation. Satisfactory tightness could only be achieved with hydraulic actuation. But here too there is a considerable disadvantage of the known rotary actuators in their comparatively complex and expensive manufacture.

Pneumatic swivel drives, which are provided with only one wing and therefore allow comparatively large swivel angles, also belong to the prior art. With regard to the sealing problem, such swivel drives have, for example, in the general catalog Pneumatic part-turn actuators, edition 08/95, of Dietrich Schwabe Gesellschaft für Steuer-Regel-Armaturentechnik mbH "on pages 1, 2 and 5, have comparable disadvantages to the double leaf part-turn actuators listed above. The entire sealing set consists of two leaf seals, two Spring plates, two shaft seals and other sealants, which together form a set of wearing parts. Furthermore, in the case of rotary actuators of this type, it is very disadvantageous that, due to the single-wing design, considerable transverse forces act on the wing shaft, which result in increased wear.

Furthermore, so-called pneumatic double-piston swivel drives are known, such as those found in the brochure Top-class part-turn actuators "from bar pneumatic control systems GmbH emerge. Such part-turn actuators, which are either single-acting (with spring return) or double-acting, are based on a rack-and-pinion principle, each with a self-centering piston guide in the housing Pneumatic actuation has been tried and tested for a long time due to its very low leakage rates. These drives also have excellent wear resistance due to the sliding bearing of all moving parts, which results in absolute maintenance-free operation. However, these known drives are comparatively complicated in their construction and therefore expensive to manufacture.

The invention has for its object a rotary actuator for actuating a Propose valve that is very low for pneumatic actuation Has leakage rate and is still simple and inexpensive can be made.

Starting from a rotary actuator of the type described at the beginning, this is Object achieved according to the invention in that each wing on opposite Sides is provided with two sealing lips made of a rubber-elastic material each along the inner surface of the housing and the inside of one have upper and a lower end wall of the housing extending sections, each with the sealing lips of opposite wings that on the same Side of the median plane of the shaft-wing unit are arranged by means of the outer Shell surface of the shaft outgoing and along the inside of the upper and the lower end wall extending sections formed in itself are, and that each partition with a self-contained, along the outer Shell surface of the shaft, the upper and lower end walls of the housing and the inner circumferential surface of the housing extending seal from a rubber-elastic material is provided.

Due to the closed design of the two sealing lips on the wings in conjunction with the seals, which are also designed to be self-contained The partition walls have an excellent sealing effect, which is the case with a Pneumatic actuation of the swivel drive is readily permitted after it has been reached the end position of the drive system pressure even over a very long Maintain period. The leakage rate is in the invention Swivel drive extremely low. Nevertheless, this is when it is actuated, i.e. one turn the frictional torque to be overcome by the shaft-vane unit low, especially if the sealing lips are provided with a suitable lubricant be, whereby the sealing effect can be increased again.

Due to the fact that at one end of the shaft from one wing to the opposite Wing-running sealing lips is used simultaneously with the sealing of the chambers a seal between the shaft bushings is also created. Additional Sealants, for example in the form of separate sealing rings, are for this reason completely unnecessary in the swivel drive according to the invention.

The partition walls are also sealed in a very simple manner by inserting them of self-contained circumferential seals in the corresponding End faces of the partitions. These are then simply between the wave and the respective inner surface of the housing used in the axial direction, whereupon the cylindrical housing is completed by the second part. Because of The one-piece design of the partition seal will cause any leaks from avoided beforehand.

The swivel drive according to the invention can thus be very simple and inexpensive manufacture and is also characterized by an almost wear-free Operation off, so that there are only very low running costs.

It is particularly advantageous if those sections of the sealing lips which are mounted in the Condition of the shaft-wing unit on the inside of the upper or lower one Fitting the front wall of the housing when the shaft-wing unit is not assembled have a distance from each other that is greater than the distance of Inner sides of the upper and lower end walls of the housing from each other.

During assembly, the sealing lips are thus on the interacting with them Sealing surfaces and thus on the inside of the upper and lower end wall pressed on the housing so that there is a secure seal.

The aforementioned advantages are also achieved when such sections of the Sealing lips in the assembled state of the shaft-wing unit on the inner Shell surface of the housing is in contact, in the unassembled state of the shaft-wing unit have a distance from each other that is larger than the inner diameter of the housing is.

Overall, in such a case the shaft-wing unit is in the assembled state on all sides through the boundary surfaces of the housing by a certain amount compressed, so that there is an overall excellent sealing effect.

A further improvement in the sealing effect can be achieved in that the Run out sealing lips with sharp edges.

The particularly critical transition area between the outer surface of the Shaft, the end face of the partition facing this and its upper or lower end face can be sealed particularly advantageously if that of the outer Shell surface of the shaft outgoing sections of the sealing lips each one have trumpet-shaped fillet on the seals of the partitions in Area of a transition from an end of the partition facing the shaft are adapted to an upper or lower end face of the partition. Especially in connection with a sharp-edged design of the sealing lips thus a sealing of this corner area that is also suitable for shaft rotation.

If the channels are assigned at their two ends to one side surface of the Adjoin the wing, the greatest possible swivel range of the wing can be achieved.

A particularly advantageous construction of the shaft-wing unit is according to the invention in that it consists of a core part made of a glass fiber reinforced Plastic is made with high strength and a limitation at all Chamber-forming surface areas with a casing made of a rubber-elastic Plastic is provided, from which the sealing lips are molded in one piece are.

The shaft-wing unit can be particularly inexpensive in this way Manufacture injection molding process, the core part being manufactured in a first operation and this in a second step with the rubber-elastic plastic is encapsulated. A separate and time-consuming individual assembly of the sealing lips, at there is no need to guarantee their exact fit anyway with such a construction.

If the wings have a web running around their end faces, at the Edges of the sealing lips are inevitably a tangential Distance between the two self-sealing lips. That way, at a good seal when pressurized from one side of a wing with a self-reinforcing sealing effect due to the chamber pressure be achieved.

The partitions are advantageously in the form of a circular segment or in cross section triangular and connectable to the housing. In this way can use the partitions on both sides as end stops for the wings serve as well when installing the rotary actuator in a simple way with the Housing are firmly connected.

Installation can be carried out particularly efficiently if the partitions are on their top or bottom on both sides of the circumferential seal a nose are provided, which in adapted recesses in the associated end wall of the housing.

From a manufacturing point of view, it is particularly favorable if the housing is made of two cup-shaped housing half is assembled.

The two cup-shaped housing halves can be made absolutely identical, if each half of the housing runs in the central plane of a partition Has inflow and outflow channel, with one chamber only via one completely overflow channel arranged next to the center line of the assigned partition connected is. By creating identical parts in this way the individual production numbers increase, which results in a cost reduction.

Developing the invention further, it is proposed that each partition on both sides their center line each with an outgoing from the assigned chamber and is provided with a pocket adjacent to the inner lateral surface of the housing, into which the overflow channel opens.

With such a configuration, it is not necessary to start the overflow channel from an alignment of the partition aligned with the central plane of the partition In and outflow channel, to be led away laterally, so that the overflow channel is very short can be executed.

The shaft of the shaft-wing unit is torque-proof outside the housing connected to an arm, the pivoting movement of two stop elements is limited, which can be positively coupled to the housing, it is not more required that the fixed partitions fulfill this stop function.

If the stop elements are circular segment shaped and on their outer surface have a toothing with a corresponding toothing inner lateral surface of an annular housing part adapted to the stop elements can be brought into engagement - with appropriate training Toothing - a very fine adjustment of the stop elements and thus an exact Realize adaptation of the quarter turn actuator to the valve to be operated with it. Such a form fit by means of the interlocking teeth can be picked up at any time and in the shifted position of the stop elements restore.

Finally, it is proposed according to the invention that on the stop elements Micro switch for feedback of the position of the rotary actuator can be attached are, the microswitches are actuated by the arm. Microswitch and With such a design, stop elements are always automatically in a correct arrangement to each other.

Fig. 1

eine Draufsicht auf einen Schwenkantrieb mit entferntem oberem Gehäuseteil;

Fig. 2

einen Schnitt durch den Schwenkantrieb gemäß Fig. 1 in einer Ebene senkrecht zur Drehachse der Wellen-Flügel-Einheit;

Fig. 3

die Wellen-Flügel-Einheit des Schwenkantriebs gemäß den Fig. 1 und 2;

Fig. 4

einen Längsschnitt entlang der Linie IV - IV durch die Wellen-Flügel-Einheit gemäß Fig. 3;

Fig. 5

einen Querschnitt entlang der Linie V - V durch die Wellen-Flügel-Einheit gemäß Fig. 3;

Fig. 6

eine Draufsicht auf die Wellen-Flügel-Einheit gemäß Fig. 3 und

Fig. 7

eine Draufsicht auf den Schwenkantrieb gemäß Fig. 2 mit Arm und zwei Anschlagelementen.

The invention is explained in more detail below using an exemplary embodiment which is shown schematically in the drawing. It shows:

Fig. 1

a plan view of a rotary actuator with the upper housing part removed;

Fig. 2

a section through the rotary actuator of Figure 1 in a plane perpendicular to the axis of rotation of the shaft-wing unit.

Fig. 3

the shaft-wing unit of the swivel drive according to Figures 1 and 2.

Fig. 4

a longitudinal section along the line IV - IV through the wave-wing unit according to FIG. 3;

Fig. 5

a cross section along the line V - V through the shaft-wing unit according to FIG. 3;

Fig. 6

a plan view of the shaft-wing unit according to FIG. 3 and

Fig. 7

a plan view of the rotary actuator shown in FIG. 2 with arm and two stop elements.

The rotary actuator 1 shown in FIGS. 1 and 2 for actuating a valve consists of a closed, cylindrical housing 2 and one therein coaxial shaft-wing unit 3. This is with a not shown The coaxial shaft of the valve to be operated can be coupled in a torque-proof manner, for which purpose 1 and 2 rotary actuator shown on such a valve, from the Stub shaft protrudes, is attached.

The shaft-wing unit 3 consists of a bearing on both sides in the housing 2 Shaft 4 and two wings 5 connected to it in one piece Wings 5 are arranged offset from one another by 180 ° and run parallel to the Axis of rotation 6 of shaft 4.

As can be seen from FIG. 2, the housing 2 consists of an upper housing half 7 and composed of a lower housing half 8. Both wings 5 extend each over the entire height 9 of a cylindrical interior 10 of the housing 2nd

As can again be seen in FIG. 1, the wings 5 each extend with a radially outer end face 11 to an inner cylindrical Shell surface 12 of the housing 2, this shell surface 12 of both housing halves 7 and 8 is formed (see FIG. 2).

In addition, two fixed, radially aligned and with respect to the housing their center planes 13 running parallel to the axis of rotation 6 of the shaft 4 Partitions 14 arranged offset by 180 ° are provided. These partitions 14 extend each also over the entire height 9 of the interior 10 of the Housing 2. Their extension also extends from the inner cylindrical surface 12 of the housing 2 up to an outer lateral surface 15 of the shaft.

As can be seen very clearly from Fig. 1, divide the two partitions 14 and the two wings 5, the interior 10 of the housing 2 in four chambers 16a, 16b, 16c and 16d.

The two non-adjacent chambers 16a and 16c are not one in FIG. 1 visible channel connected to each other, which runs inside a rib 17. The Rib 17 is located above one that divides the interior 18 of the shaft 4 Partition 18. An interconnecting the other two chambers 16b and 16d The channel runs in a rib, which is arranged below the partition 18 and therefore cannot be seen in FIG. 1 (cf. FIGS. 3 to 5).

The cross-section of the two partition walls 14 is essentially triangular or circular segment-shaped. In the area of its central plane there is a circumferential groove 19 arranged, in which a one-piece, also circumferential seal 20 is inserted. This seal 20 is sliding against the cylindrical outer surface 15 of the shaft 4. Furthermore, the seal 20 provides a sealing closure between the partition 14 and the upper end face 21, the lower end face 22 and the cylindrical inner lateral surface 12 of the housing 2 ago. At the latter sealing points there are no relative movements between the components to be sealed on. The seal 20 is made of a rubber-elastic material, preferably made of polyurethane, and due to their inherent elasticity under certain prestressing can be inserted into the groove 19.

Both partitions 14 are on both sides of their central plane 13 with one of the associated chamber 16 outgoing and to the inner lateral surface 12 of the housing adjacent pocket 23a, 23b. 23c and 23d. In the pocket 23d the partition 14 arranged on the left in FIG. 1 opens an overflow channel 24d is adjacent to the central plane 13 of the associated partition 14 and from a feed Outflow channel 25 of the lower housing half 8 starts. The inflow and outflow channel 25 can be alternately connected to a pressure medium source or the environment.

As can be seen from FIG. 2, one is identical below the inflow and outflow channel 25 trained inflow and outflow channel 26 available. Since both housing halves 7 and 8 are of identical design, the associated overflow channel 24a is located not shown in the figures, with respect to the overflow channel 24d on the other Side of the central plane 13 of the partition wall 14, so that a loading or Venting of this chamber 23a is possible. On the inflow and outflow channels 25 and 26 opposite side of the housing are for ventilation of the chambers 23b and 23c no such channels are required because of an overflow can take place via the channels running through the shaft 4.

The two housing halves 7 and 8 are made of a glass fiber reinforced polyamide material manufactured and are held together with the help of screws and nuts 26.

3 to 5 that each wing 5 on opposite sides 27 'and 27' 'with two sealing lips 28' and 28 '' made of a rubber-elastic material is provided. Each of the sealing lips 28 'and 28' 'has sections 29', 30 'and 31', those along the inner lateral surface 12 of the housing 2 of the inner sides 21 and 22 the upper and lower end walls of the housing 2 and the outer surface 15 of the shaft 4 run. Each of the sealing lips 28 'and 28' 'is self-contained; both sealing lips 28 'and 28' 'are both to the axis of rotation of the shaft parallel center plane 32 symmetrically as well as to a perpendicular to the axis of rotation 6 the central plane 33 running the shaft 4.

As can be seen in particular from FIGS. 4 and 5, there is the shaft-wing unit 3 from a core part 34 of a glass fiber reinforced polyamide material with high Strength and a sheathing 35 applied thereon by injection molding made of a rubber-elastic polyurethane material. From this casing 35 are the sealing lips 28 'and 28' 'formed in one piece.

From Fig. 5 it can also be seen that the outer surface 15 of the shaft 4 outgoing sections 31 'and 31' 'of the sealing lips 28' and 28 '' each have a trumpet-shaped fillet to which the seals 20 of the Partitions 14 in the area of the transitions from the shaft to an upper or lower Face of the partition 14 are adapted. Except for the all around sharp-edged trained line at the tip of the sealing lips is always a line contact of the sealing surfaces coming into contact with one another. For this reason is the pronounced rounding of the seals 20 of the partitions 14 or corresponding trumpet-shaped rounding of the lateral surface 15 of the Shaft 4 for a good sealing effect of comparatively great importance.

In Fig. 4 it is further shown that the wings 5 one on the end faces have circumferential web 36, on the edges of which the sealing lips are arranged are. After the injection molding of the shaft-wing unit including of the casing 35 have the opposite sections 30 'and 31 'of the sealing lip 28 a distance which is greater than the clear height 9 of the interior 10 of the housing 2. Furthermore, the diameter of the shaft-wing unit larger in the area of the opposite sections 29 'of the sealing lip 28 than the inside diameter of the interior 10 of the housing 2. The two above Statements of course also apply to the corresponding ones, but in sections of the sealing lip 28 not shown in the drawing. In this way is always for a secure installation of both sealing lips on the interacting with them Contact areas.

In FIG. 5, the channels 37 intersecting in a plan view are still for connection opposite chambers 16 shown, each extending within a rib 17. The ribs 17 are connected in one piece to a partition 18.

From Figures 4 and 6 it can be seen that the shaft-wing unit 3 in Area of the mouth of the channels 37 recesses 38 for an unobstructed Has gas change. In the upper area is the shaft 4 of the shaft-wing unit 3 provided with an internal toothing 39 into which an arm 40 shown in FIG is provided with a corresponding external toothing for this purpose is. The arm 40 thus rotates synchronously with the shaft-wing unit 3 and limits whose further rotation the moment he hits one of his abutment surfaces 41 strikes one of the stop surfaces 42 of the stop elements 43.

To the end position of the valve actuated with the swivel arm according to the invention To be able to adjust on site, the stop elements 43 are circular segment-shaped formed and provided on their outer lateral surface with a toothing 44. This toothing can be engaged with a corresponding toothing 45 bring that on an inner circumferential surface 46 of an annular housing part 47 is located. The ring-shaped housing part 47 is integral with the housing halves 7 and 8 trained to reduce production costs due to large quantities to let (see Fig. 2).

Known from the prior art can be used on the stop elements 43 Attach microswitch 48 to report the position of the rotary actuator. These microswitches 48 are actuated by the arm 40 when it reaches its end position reached. In Fig. 1 it is finally shown that each partition 14 on both sides its median plane 13 with a top and bottom Nose 49 is provided, which engages in a corresponding pocket, which in the two housing halves 7 and 8 are formed, but not in FIGS. 1 and 2 are shown.

Claims (14)

Rotary actuator for actuating a valve with a cylindrical, two Parts of existing closed housing and a coaxially mounted therein Shaft-wing unit with a coaxial shaft to be operated Armature is torque-proof and can be coupled on both sides in the housing mounted shaft and two with respect to their parallel to the axis of rotation of the The central planes running through the shaft are offset by 180 ° and with the There are connected wings, each over the entire height of one Interior of the housing and with a radially outer end face extend to an inner cylindrical surface of the housing, wherein the housing two fixed radial and with respect to their offset parallel to the axis of rotation of the shaft center planes by 180 ° arranged partition walls, each of which extends over the entire height the interior of the housing and the inner cylindrical surface of the housing to an outer surface of the shaft and the interior of the housing together with the wings in four chambers subdivide, each of which two non-adjacent chambers across the shaft penetrating channels are interconnected, and wherein further two adjacent chambers each with an inflow and outflow connection are that can be alternately connected to a pressure medium source, characterized in that each wing (5) on opposite sides (27 ', 27' ') with two sealing lips (28', 28 '') made of a rubber-elastic material is provided, each along the inner lateral surface (12) of the housing (2) and the inner sides (21, 22) of an upper and a lower end wall of the Have housing (2) extending sections (29 ', 30', 29 '', 30 ''), each the sealing lips (28 ', 28' ') of opposite wings (5) on the same Side (27 ', 27' ') of the central plane of the shaft-wing unit (3) are arranged, by means of the outer circumferential surface (15) of the shaft (4) and along the inside (21, 22) of the upper and lower end wall Sections (31 ', 31' ') are self-contained, and that each Partition (14) with a self-contained along the outer surface (15), the shaft (4), the upper and the lower end wall of the housing (2) and the inner lateral surface (12) of the housing (2) extending Seal (20) is provided from a rubber-elastic material. Swivel drive according to claim 1, characterized in that the sealing lips (28 ', 28' ') run out with sharp edges. Swivel drive according to claim 1 or 2, characterized in that the of the outer lateral surface (15) of the shaft (4) outgoing and in a longitudinal section through the shaft (4) opposite sections (31 ', 31' ') of the sealing lips (28 ', 28' ') together form a trumpet-shaped fillet to which the seals (20) of the partitions (14) in the region of a transition from one the shaft (4) facing the end face of the partition (14) to an upper or the lower end face of the partition (14) are adapted. Swivel drive according to one of claims 1 to 3, characterized in that the channels (37) at their two ends on a side surface of the associated Adjacent wing (5). Swivel drive according to one of claims 1 to 4, characterized in that the shaft-wing unit (3) consists of a core part (34) consisting of a glass fiber reinforced plastic is made with high strength, and on all with surface areas forming a boundary of a chamber (16) a casing (35) made of a rubber-elastic plastic is provided, from which the sealing lips (28 ', 28' ') are formed in one piece. Device according to one of claims 1 to 5, characterized in that the wings (5) have a web (36) running around their ends whose edges the sealing lips (28 ', 28' ') are arranged. Swivel drive according to one of claims 1 to 6, characterized in that that the partitions (14) in the form of a circular segment or triangular in cross section are and are positively connected to the housing (2). Swivel drive according to one of claims 1 to 7, characterized in that the partitions (14) on both sides of their top and bottom the circumferential seal (20) are each provided with a nose (49) which in engage adapted recesses in the associated end wall of the housing (2). Swivel drive according to one of claims 1 to 8, characterized in that the housing (2) is composed of two cup-shaped housing halves (7, 8) is. Swivel drive according to claim 9, characterized in that each housing half (7, 8) one running in the central plane (13) of a partition (14) Has inflow and outflow channel (25) with a chamber (16) exclusively over a completely next to the central plane (13) of the assigned partition (14) arranged overflow channel (24) is connected. Swivel drive according to claim 10, characterized in that each partition (14) on both sides of their central plane (13) each with one of the assigned Chamber (16) outgoing and to the inner lateral surface (12) of the housing (2) adjacent pocket (23) is provided, in which the overflow channel (24) opens. Swivel drive according to one of claims 1 to 11, characterized in that the shaft (4) of the shaft-wing unit (3) outside the housing (2) torque-proof connected to an arm (40), the pivoting movement is limited by two stop elements (43) which form-fit with the Housing (2) can be coupled. Swivel drive according to claim 12, characterized in that the stop elements (43) are in the form of a segment of a circle and have one on their outer lateral surface Have teeth (44) with a corresponding toothing (45) on an inner lateral surface (46) one adapted to the stop elements (43) annular housing part (47) can be brought into engagement. Swivel drive according to claim 12 or 13, characterized in that the stop elements (43) switch (48) for feedback of the position of the Swivel drive (1) can be fastened, the switches (48) being removed from the arm (40) can be actuated.

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