EP2785941B1 - Door actuator - Google Patents

Description

The present invention relates to a door operator, in particular a door closer, for operating a door.

Door actuators are to be understood in particular as door closers, servo door closers and door drives. In door closers, an energy store is usually preloaded by manually operating the door leaf. By unloading the energy store, the door can be closed again without manual operation. The door closers are either attached directly to the door leaf, on a door frame or on the wall. When attached to the door leaf, a linkage is attached to the output shaft of the door closer. The force is transferred to the wall or frame via this linkage. When the door closer is installed on the frame or on the wall, the force is transferred to the door leaf via the linkage. Alternatively, it is also possible to connect the output shaft coaxially to the axis of rotation of the door. The problem with previously known door actuators with a cam drive is often the mounting of the cam with the output shaft in the limited space between the opening piston and the damping piston or closing piston.

A door operator according to the preamble of claim 1 is known from the US 5,901,412 A and from the DE 298 25 208 U1 known.

It is an object of the present invention to provide a door actuator which can be assembled as simply as possible with inexpensive manufacture. It is also an object of the present invention to provide an assembly method for the door operator.

The object is achieved by the features of the independent claims. The subclaims relate to preferred developments of the invention.

The object is thus achieved by a door actuator for opening and / or closing a door, comprising a housing, an output shaft with a cam disk and a piston guided in the housing, which abuts the cam disk. The output shaft comprises a first axle shaft mounted in the housing. The axle shaft is connected in a rotationally fixed manner to the cam disk by means of a first plug connection. The cam disk and the first piston are designed in particular for converting a rotary movement of the output shaft into a linear movement of the piston. In the event that the door actuator is designed as a door closer, the force of a closer spring acts on the first piston, for example. Alternatively, for example for a door drive, the piston can also be moved hydraulically and the output shaft can thus be set in rotation via the cam disk. According to the invention, the assembly of the door actuator is facilitated in that complementary parts of the first plug connection are formed on the axle shaft and on the cam disk. This means that the cam disc can be inserted first and then the axle shaft can be inserted.

Furthermore, the object is achieved in that the output shaft comprises a second axle shaft mounted in the housing and rotationally fixedly connected to the cam disk, the first and the second axle shaft being arranged on opposite sides of the cam disk. By using two axle shafts, the cam disk is supported on two opposite sides in the housing. At least one of the two axle shafts protrudes outwards through the housing, so that, for example, a linkage for transmitting power to the door leaf or to the frame can be mounted on this axle shaft.
Both axle shafts preferably protrude outwards, so that, depending on the opening direction of the door, the linkage can be mounted either on the first axle shaft or on the second axle shaft.

It is also provided according to the invention that the second axle shaft is connected to the cam disk in a rotationally fixed manner by means of a second plug connection. The output shaft thus consists of three separate components, namely the cam disk, the first axle shaft and the second axle shaft.

The first and / or second plug connection preferably represents a positive connection between the cam disk and the first or second axle shaft. In addition to this positive connection, the axle shafts can also be connected to the cam disk in a non-positive and / or positive manner.

For this purpose, welding, preferably resistance welding, gluing or pressing of the components, is provided in particular.

In a preferred embodiment it is provided that the first plug-in connection comprises a first extension on the first axle shaft and a recess in the cam disk which is complementary to the first extension. Alternatively, the first plug connection can have a first extension on the cam disk and a first recess complementary to the first extension in the first axle shaft.

The same design is preferably also provided for the second plug connection. For example, the second plug connection can preferably comprise a second extension on the second axle shaft and a second recess in the cam disk that is complementary to the second extension. Alternatively, the second plug connection comprises a second extension on the cam disk and a second recess complementary to the second extension in the second axle shaft.

An extension complementary to the recess is to be understood to mean that the extension can be inserted into the recess and thus enables a form fit between the axle shaft and cam disk in the direction of rotation of the output shaft.

Furthermore, each of the two plug connections can preferably comprise a plurality of extensions and, accordingly, a plurality of recesses. The extensions and recesses can be arranged on the axle shafts as well as in the cam disc.

In addition, it is preferably provided that the first extension and / or the second extension is designed as a polygon or with an oval cross section. When using several extensions for a plug connection, the individual extensions can also be designed as pins with a round cross section. The recesses are each designed so that the extensions can be inserted and a positive connection is created.

It is also preferably provided that the door actuator comprises a second piston guided in the housing. The first piston and the second piston are arranged on opposite sides of the cam disk and the first piston is fixedly connected to the second piston. In particular, the two pistons are connected to one another by a plurality of, in particular two or four, webs.

It is particularly preferably provided that a diameter of the cam disk, in particular the narrowest diameter of the cam disk, measured perpendicular to the output shaft, is greater than a clear distance between two webs, also measured perpendicular to the output shaft.

Particularly when the cam disk has to be mounted between the first and the second piston, it is particularly advantageous that the first axle shaft and / or the second axle shaft only after the cam disk has been positioned in the cam disc are inserted. The cam disk can thus be inserted laterally between the first and second pistons and the axle shafts are then inserted into the cam disk from above and below.

Furthermore, a damping piston is preferably provided, which is guided in a cylindrical cavity in the second piston, the damping piston resting on the cam disk. This damping piston dampens in particular a closing movement of the door leaf.

The first and the second axle shaft are preferably designed as identical components.

The outer side of the first axle shaft and / or the outer side of the second axle shaft particularly preferably has a polygon. This polygonal connection is used to assemble the boom. The force is transmitted from the door closer to the door leaf or frame via the linkage. In particular, the polygonal connection is designed as a square. The geometry of the first plug connection and / or the second plug connection is such that when the first axle shaft and / or the second axle shaft is inserted, a defined position of the lateral edges of the polygon with respect to the position of the cam disk is created. In particular, when mounting the axle shafts, the position of the connecting square is given parallel or at a certain angle to the cam.

The axle shafts are preferably manufactured as cold extruded parts, turned parts, milled parts, forged parts or cast parts. The cam disc is preferably manufactured as a stamped part, laser-cut part, profile part, cold extrusion part, sintered part, cast part or milled part.

The following advantageous configurations relate primarily to the design of the door operator as a door closer. However, these advantageous configurations can also be applied to other door actuators, for example door drives: the door actuator, in particular designed as a door closer, comprises the first piston (opening piston) guided in the housing, which abuts the cam disk on a first side, and one on the first Piston (opening piston) acting energy store for storing a closing energy for the door. In addition, the door actuator includes the damping piston, which is guided in the cylindrical cavity of the second piston (cylinder element) and bears against the cam disk on a second side. This second piston (cylinder element) is firmly connected to the first piston (opening piston). The guidance of the first piston (opening piston) in the housing means in particular that an outer surface of the first piston (opening piston) bears against an inner surface of the housing, so that the first piston (opening piston) is guided in a linearly movable manner in the housing. Likewise, in particular, an outer surface of the damping piston bears against an inner surface of the cylindrical cavity, so that the damping piston is guided in a linearly movable manner in the second piston (cylinder element). The fixed connection between the second piston (cylinder element) and the first piston (opening piston) means in particular that the second piston (cylinder element) has no degree of freedom compared to the first piston (opening piston).

The problem with the known door actuators with cam was often that the pistons tilt minimally in their guidance. The consequence of this is that a greater effort is required to move the pistons. In particular when opening the door and thus when moving the first piston (opening piston) against the closer spring, this minimal tilting of the piston has a negative effect in previously known arrangements. In the embodiment presented here, the first piston (opening piston) is supported on the damping piston by means of the additional second piston (cylinder element). This reduces the minimum tilting of the first piston (opening piston) and thus improves the efficiency of the door operator.

In a preferred embodiment it is provided that the energy store comprises at least one closer spring. The closer spring is designed in particular as a compression spring. In a preferred embodiment, one end of the closer spring is supported directly against the end of the first piston (opening piston) facing away from the cam disk. The other end of the closer spring is supported against the housing, in particular against an end cover of the housing.

In addition, it is preferably provided that a compression spring is arranged between a side of the damping piston facing away from the cam disk and the housing. A first end of the compression spring is supported against the damping piston.

The other end of the compression spring is supported in particular against a further end cover in the housing.

In a preferred embodiment it is provided that the first piston (opening piston) comprises a first pressure roller which bears against the cam disk. The first pressure roller is rotatably supported in the first piston (opening piston). The first pressure roller thus enables low-friction power transmission between the first piston (opening piston) and the cam disk.

In addition, the damping piston preferably comprises a second pressure roller which bears against the cam disk. The second pressure roller is rotatably supported in the damping piston. The second pressure roller enables low-friction power transmission between the damping piston and the cam disk.

Instead of the first and / or the second pressure roller, corresponding friction surfaces can preferably also be formed on the first piston (opening piston) and / or damping piston for power transmission to the cam disk.

In a preferred embodiment it is provided that an outer surface of the second piston (cylinder element) is guided in the housing. In particular, the outer surface of the second piston (cylinder element) is cylindrical. The second piston (cylinder element) is thus supported inwards relative to the damping piston. On the outside, the second piston (cylinder element) is guided in a linearly movable manner in the housing and is therefore also supported in relation to the housing. Because the second piston (cylinder element) is fixed is connected to the first piston (opening piston), this double support of the second piston (cylinder element) also stabilizes the first piston (opening piston) and thus prevents tilting of the first piston (opening piston), which improves the efficiency of the door closer.

In addition, it is preferably provided that the output shaft with the cam disk is arranged between the first piston (opening piston) and the second piston (cylinder element). Since the first piston (opening piston) is firmly connected to the second piston (cylinder element) and the cam disk is located between the two components, the first piston (opening piston) is supported on both sides of the cam disk.

Furthermore, it is preferably provided that the second piston (cylinder element) and the first piston (opening piston) are made together in one piece. In particular, it is provided that the first piston (opening piston) and the second piston (cylinder element) are connected to one another via the plurality of webs. In particular, two or four webs are provided. The cam disk is located between these webs or the output shaft extends. In the case of one-piece production, in particular the first piston (opening piston), the second piston (cylinder element) and all the webs are made together from one piece. Alternatively, it is preferably also provided that the first piston (opening piston) and the second piston (cylinder element) are manufactured separately and connected to one another via webs.

The outside diameter of the second piston (cylinder element) particularly preferably corresponds to the outside diameter of the first piston (opening piston). As a result, the second piston (cylinder element) and the first piston (opening piston) can be guided in a cylindrical bore in the housing with a constant diameter.

Furthermore, a check valve is preferably located in the damping piston. The check valve comprises in particular a spring-loaded ball. Furthermore, this check valve enables, in particular, the release of excess pressure from a side of the damping piston facing away from the cam disk to the unpressurized space between the first piston (opening piston) and damping piston.

A further check valve is preferably provided in the first piston (opening piston). This check valve also preferably comprises a spring-loaded ball. This further check valve enables pressure relief from the receiving space of the closer spring to the pressure-free space between the first piston (opening piston) and damping piston.

A hydraulic damping space is preferably formed in the housing on the side of the damping piston facing away from the cam disk.

1. (i) Bereitstellen einer Kolbenbaugruppe, umfassend einen ersten Kolben und einen zweiten Kolben, wobei der erste Kolben über zumindest zwei Stege mit dem zweiten Kolben fest verbunden ist;
2. (ii) Einlegen einer Nockenscheibe zwischen den ersten Kolben und den zweiten Kolben auf einer ersten Seite der zwei Stege;
3. (iii) Einstecken eines ersten Achsschaftes von einer zweiten Seite der zwei Stege, zwischen den beiden Stegen hindurch;
4. (iv) Zusammenfügen einer ersten Steckverbindung, wobei ein erster Anteil der ersten Steckverbindung am ersten Achsschaft und ein zum ersten Anteil komplementärerer zweiter Anteil der ersten Steckverbindung an der Nockenscheibe ausgebildet sind.

The invention further comprises an assembly method for a previously described door operator, comprising the following steps in a given order:

1. (i) providing a piston assembly comprising a first piston and a second piston, the first piston being fixedly connected to the second piston via at least two webs;
2. (ii) inserting a cam between the first piston and the second piston on a first side of the two lands;
3. (iii) inserting a first axle shaft from a second side of the two webs, between the two webs;
4. (iv) assembling a first plug connection, a first part of the first plug connection being formed on the first axle shaft and a second part of the first plug connection which is more complementary to the first part being formed on the cam disk.

The first part of the connector is in particular the extension. The second part of the plug connection is in particular the recess in the cam disk. The advantageous configurations described in the context of the door actuator according to the invention are correspondingly advantageously applied to the assembly method according to the invention.

Figur 1

einen erfindungsgemäßen Türbetätiger gemäß einem Ausführungsbeispiel,

Figur 2

den erfindungsgemäßen Türbetätiger gemäß dem Ausführungsbeispiel ohne Gehäuse,

Figur 3

einen Öffnungskolben (erster Kolben) mit Zylinderelement (zweiter Kolben) des erfindungsgemäßen Türbetätigers gemäß dem Ausführungsbeispiel,

Figur 4

einen Dämpfungskolben des erfindungsgemäßen Türbetätigers gemäß dem Ausführungsbeispiel,

Figur 5

eine Schnittansicht durch Öffnungskolben (erster Kolben) und Dämpfungskolben des erfindungsgemäßen Türbetätigers gemäß dem Ausführungsbeispiel,

Figur 6

eine dreiteilige Abtriebswelle mit Nockenscheibe des erfindungsgemäßen Türbetätigers gemäß dem Ausführungsbeispiel in Explosionsdarstellung,

Figur 7

die Abtriebswelle mit Nockenscheibe im montierten Zustand in einer Detailansicht, und

Figur 8

eine Schnittansicht der Darstellung aus Figur 7.

The invention will now be described in more detail using an exemplary embodiment. It shows:

Figure 1

a door actuator according to the invention according to an embodiment,

Figure 2

the door actuator according to the invention according to the embodiment without a housing,

Figure 3

an opening piston (first piston) with a cylinder element (second piston) of the door actuator according to the invention according to the exemplary embodiment,

Figure 4

a damping piston of the door actuator according to the invention according to the embodiment,

Figure 5

2 shows a sectional view through the opening piston (first piston) and damping piston of the door actuator according to the invention in accordance with the exemplary embodiment,

Figure 6

a three-part output shaft with cam disk of the door actuator according to the invention according to the embodiment in an exploded view,

Figure 7

the output shaft with cam in the assembled state in a detailed view, and

Figure 8

a sectional view of the representation Figure 7 .

In the following, the door actuator, designed as a door closer 1, is based on the Figures 1 to 8 explained in detail.

Figure 1 shows the door closer 1. The door closer 1 comprises an essentially cylindrical housing 2. The two front ends of the housing 2 are closed by means of a first cover 4 and a second cover 5. An output shaft 3 of the door closer 1 projects from the housing 2. For example, a linkage is fastened to this output shaft 3. The force is then transmitted to the door leaf or to the wall or door frame via this linkage.

In Figure 2 the housing 2 of the door closer 1 is hidden. As in Figure 2 can be seen, the door closer 1 furthermore comprises a cam disk 6 which is connected to the output shaft 3 in a rotationally fixed manner. On one side of this cam disk 6 there is an opening piston 7 (first piston). The opening piston 7 is mounted in the housing 2 so as to be linearly movable. For this purpose, the outer surface of the opening piston 7 is in contact with the housing 2. On the other side of the cam disk 6 there is a cylinder element 8 (second piston). The cylinder element 8 is firmly connected to the opening piston 7 via four webs 9. In particular, the opening piston 7, the cylinder element 8 and the webs 9 are made together in one piece.

The opening piston 7 comprises a first pressure roller 12 (see. Figure 3 ). This first pressure roller 12 is rotatably mounted in the opening piston 7 by means of a first pressure roller axis 11. The opening piston 7 bears against the cam disk 6 by means of this first pressure roller 11. In the cylinder element 8 is a Damping piston 16 (s. Figure 4 ) linearly movable. This damping piston 16 includes the in Figure 2 Second pressure roller 14 to be seen. With this second pressure roller 14, the damping piston 16 bears against the cam disk 6.

A closer spring 10 (energy store) is located on the side of the opening piston 7 facing away from the cam disk 6. The closer spring 10 is designed as a compression spring and is supported at one end against the opening piston 7 and at the other end against the housing 2, in particular against the second cover 5.

The cam disk 6 is connected in a rotationally fixed manner to the output shaft 3 or is made in one piece with the output shaft 3. The cam 6 is heart-shaped. By opening the door leaf, the output shaft 3 is set in rotation. As a result, the cam disk 6 also rotates. The cam disk 6 presses the opening piston 7 in the in Figure 2 shown position to the right. As a result, the closer spring 10 is compressed. When the door closes, the closer spring 10 relaxes and presses the opening piston 7 to the left. As a result, the cam disk 6 is set in rotation. At the same time, the damping piston 16 with the second pressure roller 14 has a damping effect on the rotary movement of the cam disk 6.

Figure 3 shows the opening piston 7 and the cylinder element 8. According Figure 3 a cylindrical cavity 15 is formed in the cylinder element 8. In this cylindrical cavity 15, the damping piston 16 (see. Figure 4 ) guided linearly. Of Furthermore, the outer surface of the cylinder element 8 is also cylindrical. The outer surface of the cylinder element 8 lies against the housing 2. As a result, the cylinder element 8 is also guided so as to be linearly movable relative to the housing 2.

Furthermore shows Figure 3 a first outer diameter 26 of the cylinder element 8 and a second outer diameter 27 of the opening piston 7. In a preferred embodiment, the first outer diameter 26 is equal to the second outer diameter 27, so that the cylinder element 8 and the opening piston 7 in a cylindrical bore in the housing 2, preferably with a constant diameter can be performed. Furthermore, the opening piston 7 has an opening piston length 28. The cylinder element 8 has a cylinder length 29. The opening piston 7 is guided in a linearly movable manner over the entire opening piston length 28 in the housing 2. The cylinder element 8 is guided in a linearly movable manner in the housing 2 over the entire cylinder length 29. The distance 31 is formed between the opening piston 7 and the cylinder element 8. The webs 9 extend over this distance 31 and the cam disk 6 is arranged at this distance 31. The opening piston length 28 and the cylinder length 29 preferably comprise at least 50% of the distance 31, in particular at least 75% of the distance 31.

Figure 4 shows the damping piston 16. The damping piston 16 is subdivided into a guide portion 17 and a pressure roller portion 18. The guide portion 17 has a damping piston length 30. Furthermore, the guide portion 17 has a cylindrical outer surface designed. The damping piston 16 is guided in a linearly movable manner, in particular, over the entire length of the damping piston 30 in the cylindrical cavity 15 of the cylinder element 8. The pressure roller portion 18 is formed as an extension on the guide portion 17. In this pressure roller portion 18, the second pressure roller 14 is rotatably supported in the damping piston 16 via a second pressure roller axis 13. Furthermore, the damping piston 16 has a cavity. A compression spring 19 is located in this cavity. A first end of the compression spring 19 is supported in the interior of the damping piston 16 against the damping piston 16. The other end of the compression spring 19 is supported against the housing 2, in particular against the first cover 4.

Figure 5 shows a sectional view through the opening piston 7, the cylinder element 8 and the damping piston 16. In this illustration, the damping piston 16 is inserted in the cylinder element 8.

Furthermore shows Figure 5 a first check valve 20 in the damping piston 16. The first check valve 20 is fastened via a first bushing 21 and a first pin 22 in the damping piston 16. The first check valve 20 enables pressure relief from the side of the damping piston 16 facing away from the cam disk 6 to the unpressurized space between the damping piston 16 and the opening piston 7.

A second check valve 23 is located in the opening piston 7. The second check valve 23 is mounted in the opening piston 7 via a second bushing 24 and a second pin 25. The second check valve 23 enables pressure relief from the side of the opening piston 7 facing away from the cam disk 6 to the unpressurized space between the opening piston 7 and the damping piston 16.

Due to the firm and rigid connection between the opening piston 7 and the cylinder element 8, the opening piston 7 is supported on the one hand against the damping piston 16 and on the other hand the opening piston 7 is twice against the housing 2, namely directly via the opening piston 7 and indirectly via the cylinder element 8 , supported. This largely prevents the opening piston 7 from tilting and thus improves the efficiency of the door closer 1.

The Figures 6 , 7 and 8 show the output shaft 3 with cam 6 of the door closer 1 in detail. In Figure 6 the three-part output shaft 3 is shown in an exploded view. Figure 7 shows the output shaft 3 in detail in the assembled state. Figure 8 shows a section of the representation Figure 7 .

The output shaft 3 is composed of the cam disk 6, a first axle shaft 32 and a second axle shaft 33. The first axle shaft 32 comprises a first extension 38 at one end. A connection 40 is formed at the other end of the first axle shaft 32. A linkage is mounted on the connection 40.

The second axle shaft 33 comprises a second extension 39 at one end. At the other end, the second axle shaft 33 comprises a further connection 40. This further connection 40 can alternatively to the connection 40 on the first axle shaft 32 can also be used to assemble a linkage.

The two axle shafts 32, 33 are each made in one piece. In the exemplary embodiment presented here, the two axle shafts 32, 33 are designed as identical components.

The cam disk 6 comprises a first recess 36 and a second recess 37. The two recesses 36, 37 are formed on opposite sides of the cam disk 6. As with the Figures 7 and 8 can be seen, the first recess 36 is formed together with the second recess 37 as a through hole in the cam disk 6.

The first extension 38 forms a first plug connection 34 together with the first recess 36. The second extension 39 forms a second plug connection 35 together with the second recess 37. For this purpose, the first extension 38 and the second extension 39 are each formed as a square with rounded corners . Correspondingly, the first recess 36 and the second recess 37 are designed as an inner square with rounded corners. The design of the extensions 38, 39 and the recesses 36, 37 can have further shapes such as, for example, a polygon or a polygon or a polygonal shape, the extensions 38, 39 being correspondingly coordinated with the recesses 36, 37.

As the Figures 7 and 8 show, the two axle shafts 32, 33 are inserted into the cam 6. This creates a positive connection between the two plug connections 34, 35 two axle shafts 32, 33 and the cam disk 6 in the direction of rotation of the output shaft 3.

Furthermore, the Figures 7 and 8 a first axle cover 41 and a second axle cover 42. The first and second axle covers 41, 42 are components of the housing 2. In each of these two axle covers 41, 42 one of the axle shafts 32, 33 is mounted so as to be rotatable.

Furthermore shows Figure 8 that the length of the extensions 38, 39 or the thickness of the cam disk 6 is selected such that the two extensions 38, 39 do not touch each other inside the cam disk 6.

In Figure 6 a narrowest diameter 44 of the cam disk is shown perpendicular to the output shaft 3. Figure 3 shows a clear distance 43 between two webs, also measured perpendicular to the output shaft 3. In the exemplary embodiment shown here, the first piston 7 (opening piston) is connected to the second piston 8 (cylinder element) via the four webs 9. The cam 6 is located between these four webs. Due to the fact that the diameter 44 of the cam disk 6 is larger than the clear distance 43 between two webs 9, an output shaft with a cam disk manufactured in one piece could not be installed here. This shows the advantage of the three-part output shaft according to the invention.

Reference list

1

Door closer / door operator

2nd

casing

3rd

Output shaft

4th

first lid

5

second lid

6

Cam disc

7

Opening piston (first piston)

8th

Cylinder element (second piston)

9

Walkways

10th

NO spring (energy storage)

11

first pressure roller axis

12th

first pressure roller

13

second pressure roller axis

14

second pressure roller

15

cylindrical cavity

16

Damping piston

17th

Leadership share

18th

Pressure roller portion

19th

Compression spring

20th

first check valve

21

first socket

22

first pen

23

second check valve

24th

second socket

25th

second pen

26

first outer diameter

27

second outer diameter

28

Opening piston length

29

Cylinder length

30th

Damping piston length

31

distance

32

first axle shaft

33

second axle shaft

34

first connector

35

second connector

36

first recess

37

second recess

38

first extension

39

second extension

40

connection

41

first axle cover

42

second axle cover

43

clear distance to the second web

44

diameter

Claims (8)

1. A door actuator (1) for opening and/or closing a door, comprising

   • a housing (2),

   • an output shaft (3) with a cam disc (6), and

   • a first piston (7), which is guided in a housing (2) and rests on the cam disc (6),

   • wherein the output shaft (3) comprises a first axle shaft (32) supported in the housing (2), and

   • wherein the first axle shaft (32) is torque-proof connected to the cam disc (6) by means of a first plug-in connection (34),

   characterized in that
   the output shaft (3) comprises a second axle shaft (33), which is supported in the housing (2) and torque-proof connected to the cam disc (6), wherein the first and the second axle shafts (32, 33) are disposed on opposite sides of the cam disc (6), wherein the second axle shaft (33) is torque-proof connected to the cam disc (6) by means of a second plug-in connection (35).
2. The door actuator (1) according to claim 1,
   characterized in

   • that the first plug-in connection (34) comprises a first extension (38) at the first axle shaft (32) and a first recess (36) in the cam disc (6), which is complementary to the first extension (38), or in that the first plug-in connection (34) comprises a first extension (38) at the cam disc (6) and a first recess (36) in the first axle shaft (32), which is complementary to the first extension (38), and/or

   • that the second plug-in connection (35) comprises a second extension (39) at the second axle shaft (33) and a second recess (37) in the cam disc (6), which is complementary to the second extension (39), or in that the second plug-in connection (35) comprises a second extension (39) at the cam disc (6) and a second recess (37) in the second axle shaft (33), which is complementary to the second extension (39).
3. The door actuator according to claim 2, characterized in that the first extension (38) and/or the second extension (39) are/is configured as a polygon or with an oval cross-section.
4. The door actuator according to any of the preceding claims, characterized by a second piston (8) guided in the housing (2), wherein the first piston (7) and the second piston (8) are disposed on opposite sides of the cam disc (6), and wherein the first piston (7) is firmly connected to the second piston (8).
5. The door actuator according to claim 4, characterized by a several, in particular two of the four bridges (9) between the first piston (7) and the second piston (8) for connecting the first piston to the second piston (8).
6. The door actuator according to claim 5, characterized in that a diameter of the cam disc (6), in particular the narrowest diameter (44) of the cam disc (6), measured vertically to the output shaft (3) is larger than a clear distance (43) between two bridges (9), measured vertically to the output shaft (3).
7. The door actuator according to any of the claims 4 to 6, characterized by a dampening piston (16), which is guided in a cylindrical hollow space (15) in the second piston (8), wherein the dampening piston (16) rests on the cam disc (6).
8. A mounting method for a door actuator (1) according to any of the preceding claims, comprising the following steps in the specified order:

   • providing a piston sub-assembly, comprising a first piston (7) and a second piston (8), wherein the first piston (7) is firmly connected to the second piston (8) by means of at least two bridges (9),

   • inserting a cam disc (6) between the first piston (7) and the second piston (8) on a first side of the two bridges (9),

   • inserting a first axle shaft (32) from a second side of the two bridges (9), passing through between the two bridges (9), and

   • joining a first plug-in connection (34), wherein a first portion (38) of the first plug-in connection (34) is formed at the first axle shaft (32) and a second portion (36) of the first plug-in connection (32), which is complementary to the first portion (38), is formed at the cam disc (6).

Images