DE29719801U1 - linear actuator - Google Patents

Description

Applicant:

company

Aumüller Aumatic GmbH Steinerne Furt 58 a D-86167 Augsburg

Representative:

Patent attorneys
Dipl.-Ing. H.-D. Ernicke Dipl.-Ing. Klaus Ernicke Schwibbogenplatz 2b D-86153 Augsburg

Date:

File:

06.11.1997
877-14 he/she

DESCRIPTION Linear actuator

The invention relates to a linear drive for windows, skylights, flaps or the like with the features in the preamble of the main claim.

Such a linear drive is known from practice. It consists of a housing that is essentially cylindrical in shape, in which various internal parts of the drive and the end closure parts are attached. The drive is attached using screws that are screwed in from the outside and engage threads on the internal parts. This type of attachment requires increased processing and assembly effort. It is correspondingly expensive. In addition, the structure is complicated and not very economical.

It is therefore an object of the present invention to provide a better and more economical linear drive.

The invention solves this problem with the features in the main claim.
The advantage of attaching the various drive parts to the housing using a press connection is that it requires significantly less machining, assembly work and costs. Cutting threads and assembling the parts with precise holes is no longer necessary.

A particularly advantageous feature is a form-fitting press connection that can absorb particularly high support forces and, if designed accordingly, also allows for anti-rotation protection. The preferred design with a recess on the parts to be attached to the housing and one or more press lugs on the housing wall requires particularly little construction and assembly effort. In addition,

Such a form-fitting press connection has the advantage that it centers itself and compensates for any tolerances. In addition, an axial clamping seat can be created, which ensures a particularly secure and largely play-free connection between the drive and driven parts.

Alternatively, the press connection can also be force-fit. An adhesion-enhancing surface or insert

Î improves the power transmission. The insert can also be designed as an adhesive layer. The strength of the force-locking connection is created by the pressing force and any accompanying small deformation of the housing wall. The pressing force can also activate the adhesive if necessary.

The press connection according to the invention also allows an axial through hole to be made at the rear end of the housing, through which an eyebolt or a cable can be guided. This axial cable routing is particularly easy and cost-effective to install. In addition, the cable loads are minimal.

In the embodiment as a form-fitting press connection, the recess is designed as an annular groove that runs around at least some of the area. This means that the parts can be mounted in the housing in any rotational position. The press lugs are then inserted from the outside and fix the parts in the desired position. In the design according to the invention, a rotation lock in the form of a locking pin can be attached, which is inserted through a drilled press lug and fixed in a counterbore on the inner part. The rotation lock can be attached to any point in the connection area after the parts have been mounted.

Further advantageous embodiments of the invention are specified in the subclaims.

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The invention is illustrated by way of example and schematically in the drawings. In detail:

Figure 1: a linear drive in side view,

Figure 2: a longitudinal section through the representation of Figure 1;

Figure 3: a linear drive in longitudinal section and in extended position

Figure 4: an enlarged and broken

Longitudinal section of the press connection between housing and holder,

Figure 5: a broken variant of Figure 4 with a force-fitting press connection,

Figure 6: a cross section through the linear drive according to Figure 1-4 in the area of the press connection and

Figure 7: a cross section through the linear drive according to Figure 5 in the area of the press connection.

Figure 1 shows a side view from the outside of a linear drive (1) which contains an elongated, preferably cylindrical housing and several drive parts (4) arranged therein. The housing (2) is closed at both ends by axially inserted closure parts (3). At one end, a rod (11) protrudes from the housing (2) which can be moved forwards and backwards by the drive parts (4). It can carry a suitable fitting (e.g. eye) at the end. An eyebolt (17) can be mounted at the rear end.

As Figures 2 to 7 show in detail, the locking parts (3) and the drive parts (4) are in the housing

(2) is fixed by a press connection (5). In the embodiment of Figures 5 and 7, this can be a force-locking connection. In the embodiment of Figures 2-4 and 6, it is a form-locking press connection (5). Alternatively, combinations with form-locking/force-locking are also possible.

&iacgr;&ogr; The drive parts (4) consist, for example, of a motor (10) and a flanged gear, which is connected to the rod (11) or a spindle via a coupling (16). The motor (10) and spindle (11) are held together with the coupling in a holder (13) and are guided circumferentially at least in places (see Figures 6 and 7) in the housing (2). The spindle (11) also has a suitable nut and runs against a spring assembly (12) at the back.

As Figures 4 and 5 show in detail, the holder (13) consists of two rings (20, 21) between which the bearing (14) is clamped. One ring (20) is assigned to the motor (10) and the other ring (21) to the spindle (11). The coupling (16) is arranged inside. It is preferably designed as a plug-in coupling and consists of a tongue on the motor (10) that is essentially rectangular in cross-section and that engages in a correspondingly matching counter-opening on the spindle (11).

The positive press connection (5) is formed in Figures 2-4 and 6 by one or more recesses (6) on the closure parts (3) and the drive parts (4), in particular the receptacle (13). The recesses (6) are located on the circumference of the parts. They are preferably designed as an annular groove (6) that runs around at least some of the area. The annular groove (6) can be chamfered at the edges.

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Press lugs (7) in the wall of the housing (2) engage in the recesses or ring grooves (6) and are pressed into the recesses or ring grooves (6) from the outside. To do this, a suitable pressing tool is pressed against the housing wall, which forms the press lugs inwards. This can be a suitable stamp, for example. The chiseled press lugs (7) center themselves in the recesses (6) or ring grooves.

As Figures 1, 6 and 7 show, at each connection point several pressing lugs (7) are arranged in a row in a ring shape around the circumference of the housing (2). As a result, several pressing lugs (7) are in engagement with the ring groove. Figure 1 also shows the appearance of the pressing lugs (7) as point-shaped caulking of the housing wall.

The two end closure parts (3) are also connected by a positive and/or non-positive press connection

(5). In the preferred embodiment, the drive parts (4) fix the holder (13). For this purpose, each of the two rings (20, 21) has an annular groove (6) into which the press lugs (7) engage. The press connections (5) are arranged on both sides of the centrally clamped bearing (14). This fastening makes the bearing seat on the housing safer and more stable. Alternatively, other components of the drive parts (4), e.g. the motor housing, etc., can also be fixed in the manner mentioned.

In the preferred embodiment, the housing (2), the closure parts (3) and the drive parts (4) are rotationally symmetrical. The inner parts (3,4) are adapted in their outer contour to the inside of the housing. Figure 6 shows this construction. A rotation lock can be provided to support the rotary drive forces. In

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In the preferred embodiment, the anti-rotation device consists of a locking pin (8) which is inserted through one of the press lugs (7) into a counterbore (9) on the holder (13). For this purpose, after the press connections (5) have been attached, the bore (9) can be placed through the press lug (7). The locking pin (8) is then simply inserted and positively locks the holder (13) against the housing (2).

Figures 5 and 7 show a variant of the linear drive (1) with a force-locking press connection (5). Here, the housing wall (2) is pressed against the internal parts (3,4,13,20,21) to be fastened by the press lugs (7). A force-locking friction connection is created at the deformation and contact point. The press lugs (7) can be present in greater numbers here to increase the holding force. They can also be linear or ring-shaped.

To increase the holding force of the friction connection, the parts to be fastened (3, 4, 13, 20, 21) and/or the inner housing wall (2) can have a friction-enhancing surface (23) at least in the area of the connection point. This can be roughened, for example. Alternatively or additionally, an adhesion-enhancing insert (22) can also be present at the connection point. This can be, for example, flocking, a fabric, a rubber layer or the like. In a further modification, the insert (22) can also be an adhesive layer. An adhesive that is only activated under pressure and hardens or sets is recommended. This means that the parts can still be assembled without hindrance before the press connection (5) is created.

Even with the force-fit press connections (5) according to Figures 5 and 7, a rotation lock in the form of the locking pin (8) or in another suitable

training must be available. In a variation of the design shown, the force-locking and form-locking connection types can also be swapped or combined with one another.

Figure 7 shows another variant in the cross-sectional design of the parts to be connected (3,4,13,20,21). These have several segments (24) on the outside of the circumference, with which they are attached to the inner wall of the housing.

(2) in the area of the connection points. There are recesses between the segments (24). Figure 6 shows the other design, in which there is full-surface contact and guidance on the circumference.

At one closure part (3), the rod or spindle (11) emerges through an opening with a suitable sealing arrangement. The other closure part (3) can also have a through opening (18), which optionally has an internal thread. Here, for example, a rear fitting part, e.g. an eyebolt (17), can be screwed in as shown in Figure 2. A cable (19) to the motor (10) can also be inserted axially through the opening (18).

Modifications of the embodiment shown are possible in various ways. Instead of or in addition to the holder (13), other drive parts (4) can also be fixed with a press connection (5). The holder (13) can also be designed differently and, for example, only be provided with a press connection (5). The drive parts (4) can also be designed in any suitable way. Instead of the point-shaped press lugs (7), linear impressions or caulking can also be present. There or in addition to a circumferential, all-round alignment of the recesses (6) and the associated press lugs (7),

an axial alignment must also be present. Instead of prepared recesses in the ring grooves (6), the drive parts (4) can also have at least partially deformable outer areas that give way under the pressing pressure and into which the pressing lugs (7) can form.

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LIST OF REFERENCE SYMBOLS

1 linear actuator 2 Housing 3 Closure parts 4 Drive parts 5 Press connection 6 Recess, annular groove 7 Press wart, point pressing 8th Locking pin 9 drilling 10 Engine / gear 11 Rod, spindle 12 Feather 13 Recording 14 camp 15 Longitudinal axis 16 coupling 17 Eyebolt 18 Passage opening 19 Cable 20 ring 21 ring 22 inlay 23 surface 24 segment

Claims (13)

ti···* - 11 CLAIMS FOR PROTECTION 1.) Linear drive for windows, skylights, flaps or the like, consisting of a housing in which internal parts of the drive and the end closure parts are fastened, characterized in that the fastening is designed as a press connection (5). 2.) Linear drive according to claim 1, characterized in that a positive-fit press connection (5) is provided. 3.) Linear drive according to claim 1 or 2, characterized in that the parts (3, 13) to be fastened in the housing (2) have at least one circumferential recess (6) into which one or more externally attached pressing lugs (7) of the housing (2) engage in a form-fitting manner. 4.) Linear drive according to claim 1, 2 or 3, characterized in that the recess (6) is designed as an annular groove which runs around at least part of the circumference. 5.) Linear drive according to claim 1 or one of the following, characterized in that the pressing lugs (7) are designed as point-shaped caulkings of the housing wall. 6.) Linear drive according to claim 1 or one of the following, characterized in that several pressing lugs (7) are arranged in a row in a ring shape around the circumference of the housing (2). 35 7.) Linear drive according to claim 6, characterized in that the drive parts (4) are held in a receptacle (13) with a bearing (14), with press connections (5) being arranged on both sides of the bearing (14). 8.) Linear drive according to claim 1 or one of the following, characterized in that the press connection (5) has a rotation lock with a locking pin (8). 9.) Linear drive according to claim 8, characterized in that the locking pin (8) is arranged in a pressing lug (7) and a bore (9) of the part to be fastened (3,13). 10.) Linear drive according to claim 1 or one of the following, characterized in that an axial through-opening (18) for receiving a cable is provided on an end closure part (3). (19) or an eyebolt (17). 11.) Linear drive according to claim 1 or one of the following, characterized in that the press connection (5) is force-fitting, whereby an adhesion-increasing surface (23) or insert (22) is provided between the housing (2) and the parts to be fastened (3, 13). 12.) Linear drive according to claim 11, characterized in that the insert (22) is designed as an adhesive layer. 13.) Linear drive according to claim 1 or one of the following, characterized in that the parts to be fastened (3, 13) have a segmented (24) circumference.