DE102008015686B4 - drive and device - Google Patents

Abstract

Drive, comprising at least one drive component and a central housing part (1),
a connection area (10) and a spring area (9) being formed in one piece on the housing part (1),
at least the connection area (10) being connected to the rest of the housing part (1) via the spring area (9),
the connection area (10) being provided for the non-positive connection, i.e. clamping connection, of the drive component
wherein the drive comprises a space (3) for gears, a space (2) for electric motor and a space (4) for electronics,
wherein the central housing part (1) at least partially delimits each spatial area (2, 3, 4),
whereby the electric motor can be fed, controlled and/or regulated by means of the electronics and the transmission can be driven by means of the electric motor,
wherein the drive component is a stator lamination stack of an electric motor part,
wherein the connection area (10) is designed as a torque support for the drive component,
a form-fitting connection, namely a feather key connection, being provided in such a way that if the force-fitting connection fails, the form-fitting connection occurs to prevent a rotary movement of the stator (17) against the central housing part (1), the deflection direction of the spring area (9) being provided radially to the rotor axis of a motor.

Description

The invention relates to a drive and a device.

From the DE 103 28 228 A1 a compact drive is known which contains an electric motor, a gearbox and the required electronics. A compact drive with small dimensions is made possible by a spatially favorable arrangement.

From the DE 10 2004 054 601 A1 a compact drive is known as the closest prior art.

From the DE 18 13 090 A a housing for electrical machines is known, in which the laminated stator core is held in a non-positive manner.

The object of the present invention is to make a compact drive producible with as few parts as possible.

According to the invention, the object is achieved with the drive according to the features specified in claim 1 and with the device according to the features specified in claim 11 .

Important features of the invention in the drive are that the drive comprises at least one drive component and a housing part, in particular a central housing part, with a connection area and a spring area being formed in one piece on the housing part, with at least the connection area being connected to the rest of the housing part via the spring area is.

The advantage here is that no further parts are required for clamping the stator in the housing part, but the housing part itself already has a spring area and connection area. This can be implemented as a respective clamping jaw, which protrudes from the housing part into the interior of the housing part. The housing-forming function for these clamping jaws, ie also for the connection area, can therefore be carried out by the housing part and other housing parts. Thus, the clamping jaws only have to fulfill the connection function and not the housing function towards the environment. This in turn is carried out by the remaining housing areas mentioned and other housing parts. The advantage here is that the intermediate area between the clamping jaws protruding into the interior and the remaining areas of the housing and further housing parts can be used for components such as electronic components or also other components. Despite the seemingly non-compact design of the housing at first glance, a very compact drive can be implemented overall because the housing function for the motor area and, for example, the electronics area can be implemented together, i.e. housing material can be saved. Due to the inwardly projecting design of the connection area, in particular of the clamping jaws, the best possible decoupling of the deformation area from other housing areas can also be achieved.

Another advantage of the invention is that the central housing part also has the function of cooling the engine and the transmission. Because at least one bearing of the rotor shaft and one bearing of the output shaft is mounted in the central housing part. The corresponding shaft sealing rings that seal the interior of the drive against the environment are also arranged adjacent and are at least also cooled to the environment via the central housing part. There is also electronics in the housing, which also has to be cooled, but depending on the operating status, has a different temperature level than the engine and the transmission. The central housing part at least partially delimits the spatial area of the electronics. Thus, although the cooling part, namely the central housing part, is exposed to different temperatures and, accordingly, to thermal expansion, it is used in the invention to form a clamping connection for the stator. To increase safety, a form fit is also provided, which is used if the force fit fails.

A thermal barrier to the electronics is also optionally provided in order to relieve the clamp connection from thermal stress.

In an advantageous embodiment, the connection area is provided for the non-positive connection, in particular a clamping connection, of the drive component. The advantage here is that no damage occurs when connecting the laminated stator core and the laminated stator core can therefore be connected, in particular clamped, without excessive forces but with a force that is sufficiently large to form a torque arm.

According to the invention, the drive component is a laminated stator core of an electric motor part. The connection area is provided to form a torque arm for the drive component. The advantage here is that a torque support can be introduced into the housing part, which is also provided for cooling the motor and the other components, such as electronics and gears. It is therefore advantageous that the heat generated by the stator can be spread over a much larger housing part than is necessary for a comparable motor. Although they are too to heat other components on the housing part; However, it has been found that at the various operating points of the drive, not all of the components have their maximum heat output at the same time. For example, the gearbox does not generate any heat when it is at a standstill, but the electronics do. At maximum speed and load, for example, the gear has its maximum heat output. The heat from the heat source present at the respective operating point is always spread out via the housing part.

In an advantageous embodiment, the drive comprises a space for the gear, a space for the electric motor and a space for the electronics, in particular the electronics feeding, controlling and/or regulating the electric motor and the electric motor driving the gear. The advantage here is that the electronics can be equipped with converter functionality. The motor can thus be speed-controlled or used for positioning purposes, in particular if an angular position sensor is provided which is connected to the motor shaft or a gear shaft.

In an advantageous embodiment, the housing part comprises at least one bearing seat for the bearing of the output shaft and one bearing seat for the bearing of the motor rotor on the output side. The advantage here is that the drive can be constructed very compactly and the bearing seats can be machined in one setting on the processing machine, ie the relative position to one another can be generated very precisely. Nevertheless, a deformation area is provided on this housing part. Since box-shaped reinforcements and further decoupling are also provided, the deformation has no further effect on the relative position mentioned.

In an advantageous embodiment, at least one shaft sealing ring is provided to seal off the transmission area from the environment and a shaft sealing ring to seal off the motor area from the transmission area. The advantage here is that the clamping jaws are so far decoupled from the housing part via the spring area that the running surfaces for shaft sealing rings are not deformed. Additional stiffening measures also contribute to this.

In an advantageous embodiment, at least one sealing surface is provided on the housing part, on which another housing part, in particular the housing cover, can be tightly connected. The advantage here is that the additional part can be used to cool the electronic components.

In an advantageous embodiment, the running surfaces for shaft sealing rings and/or sealing surfaces for seals are arranged and provided in such a way that the sealing function remains undisturbed even with elastic deflection of the spring area to produce the non-positive connection. The advantage here is that the distortions on the surface can be maintained below the tolerance band.

In an advantageous embodiment, the sealing surface is provided on the edge area of a box-shaped form of the housing part. The advantage here is that the box represents a reinforcement. Due to the fact that the box is provided on the housing area of the engine and the transmission, ie touches both, further reinforcement can be achieved, with these two housing areas representing a base plate for the box, so to speak.

In an advantageous embodiment, the box with the seal encompassing the sealing surface represents a heat barrier between the further housing part and that housing area of the central housing part which is adjacent to the laminated stator core of the motor. The advantage here is that the height of the box makes it possible to increase the heat transfer resistance with increasing height.

In an advantageous embodiment, the further housing part is designed as a heat sink, in particular with cooling ribs and/or cold fingers. The advantage here is that heat dissipation is improved and the housing part also cools the electronics and not the other components. The electronics can therefore be kept at a different temperature level than the other components. Parts of the electronics can be attached to the central housing part by means of metallic screws. However, the printed circuit board material actually represents a heat barrier to the electronic components. This means that a mechanical but no thermal connection is achieved at the attachment points.

Important features of the device are that it comprises at least one component and a housing part, with a connection area and a spring area being formed in one piece on the housing part,
at least the connection area being connected to the rest of the housing part via the spring area,
wherein the connection area is provided for the non-positive connection of the component.

The advantage here is that no further parts are required for the non-positive connection of the components in the housing part, but the housing part itself already has a spring area and connection area. This can be implemented as a clamping jaw, for example.

In an advantageous embodiment, the housing part is designed to be die-cast, in particular spatial areas, in particular for gears, for electronics and/or for the motor, are designed in such a way that a slide can be pulled out at the end of the casting process. The advantage here is that production can be carried out simply and inexpensively as a mass product.

In an advantageous embodiment, the pulling direction for a first spatial area, in particular the spatial area for accommodating electronics, is perpendicular to the pulling direction for at least one spatial area, in particular two spatial areas, in particular for the spatial area for the engine and transmission. The advantage here is that the stability and rigidity is improved.

According to the invention, the deflection direction of at least one spring area is provided radially to the rotor axis of a motor. The advantage here is that the stability and rigidity are improved. In addition, the deflection direction is such that the round stator can be clamped easily and without damage.

In an advantageous embodiment, the deflection is brought about by a pull rod or screw, which is provided perpendicular to the pulling directions of the or all slides. The advantage here is that the stability and rigidity is improved. In addition, the direction can be selected in the tangential direction to the stator and a simple clamped connection can thus be implemented. No special means are necessary, with the exception of the housing part and a screw with a nut to be inserted in the insertion groove or means that have a corresponding technical effect.

Further advantages result from the dependent claims. The invention is not limited to the combination of features of the claims. For the person skilled in the art, there are further meaningful combinations of claims and/or individual claim features and/or features of the description and/or the figures, in particular from the task and/or the task posed by comparison with the prior art.

• 1a zeigt ein zentrales Gehäuseteil des Antriebs in Draufsicht.
• 1b zeigt einen Schnitt entlang der Linie B-B aus 1a.
• 1c zeigt eine Schrägansicht des geöffneten zentralen Gehäuseteils.
• 1d zeigt weitere Details zur 1c, wobei ein Bereich des Gehäuseteils herausgebrochen dargestellt ist.
• 2a zeigt eine Draufsicht des zentralen Gehäuseteils mit eingebautem Motor.
• Die 2b zeigt einen Schnitt entlang der Linie C-C aus der 2a.
• Die 2c eine zugehörige Schrägansicht des geöffneten zentralen Gehäuseteils mit eingebautem Motor.
• Die 3a zeigt eine Draufsicht auf das zentrale Gehäuseteil mit eingebautem Motor in einer weiteren Ausführungsform der Erfindung.
• Die 3b zeigt einen Schnitt entlang der Linie B-B aus der 3a.

The invention will now be explained in more detail with reference to figures:

• 1a shows a central housing part of the drive in plan view.
• 1b shows a section along line BB 1a .
• 1c shows an oblique view of the opened central housing part.
• 1d shows more details about 1c , wherein a portion of the housing part is shown broken away.
• 2a shows a plan view of the central housing part with built-in motor.
• The 2 B shows a section along line CC from FIG 2a .
• The 2c an associated oblique view of the opened central housing part with built-in motor.
• The 3a Fig. 12 shows a plan view of the center housing with built-in motor in another embodiment of the invention.
• The 3b shows a section along line BB from FIG 3a .

At the in 1 housing part shown is the central housing part 1 of a compact drive. This includes an electric motor, a gearbox and the electronics required to control and regulate the drive, in particular with the functionality of a converter for speed-controlled operation of the motor. The arrangement of the exemplary embodiment enables optimal use of the installation space within the housing, since the individual components are arranged in an advantageous manner.

The central housing part satisfies the different requirements of the individual components. In particular, mechanical and thermal stresses arise during operation. In addition, individual sub-chambers inside must be stable and tightly separated from one another so that, for example, no gear oil penetrates into the area of the electric motor or even the electronics. Temperature differences and the resulting pressure differences put additional stress on the housing.

In the space intended for the gearbox, precisely machined seats are required for the bearings of the individual shafts. In the electronics area, i.e. the spatial area that is to accommodate the electronics, appropriate attachment points for attaching at least one printed circuit board must be provided and the area provided for the electric motor is designed in such a way that the electric motor can be seated in a torsion-proof manner.

The central housing part 1 is initially available as a cast part and is completely machined in all sub-areas before the assembly of individual components. All bearing seats for the shafts are therefore turned out, in particular finely machined. All holes for the attachment of circuit boards or covers are in the appropriate area chen inserted and provided with threads. The seat of the motor stator is turned out.

The one in the 1a illustrated top view shows the central housing part 1, which is designed as a one-piece cast part. The area visible from above is used for installing the electronic components, which are not shown in the figure.

In the 1a shown are the clamping jaws 8 according to the invention, which are incorporated in one piece into the central housing part. The clamping jaws 8 are separated from the central housing part 1 on three sides by gaps 13 , 19 . The fourth side of the jaws 8 is resiliently connected to the central body part. An insertion groove 11 , which is provided for receiving the clamping screw 14 , is worked into the clamping jaws 8 .

In the 1a the section line BB is shown, the view in which 1b is shown. The sectional image of 1b shows the central housing part 1, which partially encloses the spatial area for the stator 2 in a ring shape. The two clamping jaws 8 are connected to the central housing part 1 via the spring area 9 . This spring area 9 is followed by the connection area 10 for the non-positive connection to the stator core. When machining the space for the stator 2, it is turned to the dimensions of the stator. During turning, the two clamping jaws 8 are separated from one another by removing the material connecting the two. This creates the gap 13, which allows movement within the elastic deformation range of the two jaws.

The two working surfaces 12 are machined in such a way that contact surfaces for discs 15, which are pressed on by means of the screw head or the screw nut, are V-shaped, i.e. they are prepared with a negative angle for self-locking of the clamping screws 14.

The insertion groove 11 runs in a tangential direction to the motor axis, i.e. perpendicular to the radial and perpendicular to the axial direction, in connection with the clamping jaws 8 and the central housing part 1. It enables the two clamping jaws 8 to be pulled together by means of a clamping screw 14 and a nut inserted in the groove 16. Here, the gap 13 is reduced and the spatial area for the stator 2 is reduced in such a way that the stator is non-positively connected to the central housing part 1, in particular the connection areas 10 are operated as clamping connection elements.

The negative angle of the working surfaces 12 is adjusted in such a way that when the clamping jaws 8 are pulled together, the screw heads are prevented from slipping off and the bearing surface for the screw head is at its maximum. This enables the best possible connection between the clamping jaws 8 and the screw heads of the clamping screw 14 .

The machining surfaces 12 are designed and the profile in the spring area 9 on the side facing away from the space area for the stator is designed in such a way that potential fracture points in the central housing part 1 are avoided. In this case, changes in the tangential angle are not discontinuous in the course of the profile, but are carried out continuously. So the spring area merges into neighboring areas in a rounded manner.

The 1c shows the central housing part 1 in an oblique view. The spatial area for the stator 2 is difficult to see. In the foreground, the figure shows the spatial area for the transmission 3. The spatial area for the electronics 4 can be seen in the upper area of the figure. The seats of the bearings for the transmission shafts are shown in spatial area 3 of the transmission. The bearing seat for the rotor shaft bearing 5 is only partially visible. The bearing seats 6 for the intermediate shafts and the bearing seat 7 for the output shaft are also shown in this space 3 .

1d equals to 1c , With a better representation of the arrangement of the jaws 8, a portion of the housing part 1 in the 1d was shown broken out.

The one-piece connection of the clamping jaws 8 to the central housing part 1 can be clearly seen here. In the spring area 9, the material thickness is chosen so that the elastic deformation caused by the contraction of the clamping jaws is passed on to the central housing part only to a small extent. In the connection area 10, the material thickness is selected such that the forces applied by the clamping screw 14 are transferred in a targeted manner to the stator 17 to be held. An optimal connection is characterized by maximum holding power and minimum deformation of the central housing part 1. This is achieved when the clamping jaws 8 extend over at least one twelfth of the circumference of the stature, ie an angular range of at least 30° in the circumferential direction, in particular freely axially.

In the 1d you can see the bearing seats for the individual gear shafts. The bearing seat 5 for the rotor shaft bearing is machined both on the engine side and on the transmission side. Since here the spatial area for the stator 2 is opposed to the spatial area for the Transmission 3 has to be sealed, precise machining of the bearing seat for the rotor shaft bearing 5 is necessary.

The bearing seats 6 for the intermediate shaft bearing are offset laterally under the bearing seat for the rotor shaft bearing. These are also fully machined so that the corresponding shaft can be used directly.

You can also see the bearing seat 7 for the output shaft bearings. Here, too, the central housing part 1 is sealed off from the outside, which is why high accuracy is required for the machining of this bearing seat.

The final mechanical processing of the entire central housing part 1 is an essential prerequisite for the further assembly of the individual components, electric motor, transmission and electronics.

In the 2a-2c the central housing part 1 is shown with the stator 17 installed. The clamping screw 14 lying in the insertion groove 11 is provided with two washers 15 which rest on the working surface 12 . For bracing, the nut 16 is tightened with a specified moment, as a result of which the clamping jaws 8 deform elastically on the spring area 9 and the width of the gap 13 is reduced.

2a shows a top view, 2 B shows the section along the line CC of the central housing part 1 with the built-in stator 17, in which the rotor 18 is located.

The position and extent of the axial portion that is necessary to clamp the stator in the central housing part 1 depends on the size of the motor and thus on the maximum torque that must be supported by holding the stator 17 using the clamping jaws 8 . Furthermore, when dimensioning the clamping jaws 3, the mechanical load on the entire central housing part 1 must be taken into account.

In the sectional view of 2 B it can be seen that the width of the gap 13 has been reduced by tightening the clamping screw 14 . The elastic deformation in the spring area 9 of the clamping jaw 8 causes a displacement of the connection area 10 , which in turn causes a displacement of the working surface 12 . As a result, the angle of the V-shaped machined processing surfaces 12 is reduced to such an extent that the contact surface of the disk 15 is as large as possible and the self-locking effect, which fixes the clamping screw 14 in the insertion groove 11, is retained.

The 2c shows an oblique view of the central housing part 1 in which the electric motor consisting of the stator 17 and the rotor 18 and the transmission are already installed. Based on this view, the installation of the clamping screw 14, the washers 15 and the nut 16 and the associated self-locking effect, which prevents the clamping screw 14 from slipping upwards, is shown in an improved manner.

The axial area for the clamping jaws, i.e. the axial area over which the clamping jaws expand, is decoupled from the axial area of the bearing seats 5, 6, 7 via axial intermediate areas in such a way that the deformation of the spring areas does not affect the center distance of a gear stage.

In addition, the attachment points, in particular also those for attaching printed circuit boards to the housing part and/or for attaching other housing parts, such as covers and the like, are only shifted insignificantly. In particular, the displacements are so small that the seals are not impaired in their function.

Axially next to the machined bearing seats 5 and 7 there are also seats for shaft sealing rings and machined accordingly. Thus, the spatial area of the transmission is sealed against the spatial area of the motor in a lubricant-tight manner, in particular oil-tight. In addition, a sealing of the spatial area 3 for gears against the environment is provided.

Likewise, the sealing surface 20 is designed so wide and the inserted seal is designed such that despite the deformation of the sealing surface caused by the elastic deflection of the spring areas, the electronics area 4 and the motor area 2 remain sealed against the environment.

It is important for the bore 21 for connecting screws for connecting a housing cover to the central housing part 1 that it is positioned far enough away from the clamping jaws 8 that even with the elastic deflection of the clamping jaws 8 no significant displacements of the bore occur. For this purpose, the central housing part is box-shaped to delimit the electronics compartment area. This box is placed on the partially rounded housing area to delimit the spatial area of the stator and is made in one piece. A part of the box protrudes, so to speak, beyond the space for the stator and is therefore placed on the housing area to delimit the space for the transmission and is also designed in one piece with this housing area. The Bohrun Gen 21 are provided in the corner areas of the box and thus as far away as possible from the clamping jaws, which are provided via the spring area on the housing area to limit the spatial area of the stator.

The sealing surface 20 is provided on the edge portion of the box. Since the box itself is already a stiffened structure and the clamping jaws are only indirectly connected to the box via the spring area with the housing area to delimit the spatial area of the stator, the deformation of the sealing surface is only slight.

The bores 22 for connecting screws are provided for fastening electronic components and are made in thickenings which are connected to the box in such a way that the effect of the elastic deflection of the clamping jaws also remains sufficiently small and the fastening function for the electronic components thus remains undisturbed.

In further advantageous exemplary embodiments, the partial axial area in which the clamping jaws are provided is selected in such a way that the clamping jaws cover the entire axial area of the stator, in particular of the laminated core of the stator.

In further advantageous exemplary embodiments, two or more axial partial areas are designed as clamping jaws.

In further advantageous exemplary embodiments, the housing part is made of metal. Die-casting is particularly favorable here. If you choose an aluminum die-cast, the thermal conductivity is even improved.

3a shows the housing according to the invention in a further advantageous embodiment. The stator of the motor 17 is additionally held in a form-fitting manner by a sliding block 23 introduced into the gap 13 located between the clamping jaws.

In the sectional view of the 3b the mode of action of the slot nut 23 can be seen more clearly. The stator 17 of the motor contains an axially extending groove 24 in the area of the gap 13. The sliding block 23 is inserted into the gap 13 and fixed by the clamping screw 14 in the radial direction. When the clamping jaws 8 are tightened by the nut 16, the sliding block is additionally held in the tangential direction. This additional part enables both a non-positive connection of the stator 17 with the central housing part 1 by the clamping jaws and a positive connection. Safety is thus increased, since if the non-positive connection fails, the positive connection is used.

In a further embodiment, the slot nut 23 is conically shaped and connected to the clamping screw 14 by a slot. This makes it possible for the slot nut 23 to fit into the gap 13 with a precise fit.

reference list

1

central body part

2

Spatial area for stator

3

Space for gears

4

Room area for electronics

5

Bearing seat for rotor shaft bearings

6

Bearing seat for intermediate shaft bearing

7

Bearing seat for output shaft bearing

8th

jaw

9

spring range

10

connection area

11

insertion groove

12

processing area

13

gap

14

clamping screw

15

disc

16

Mother

17

stator

18

rotor

19

Split

20

sealing surface

21

Hole for connecting screws for housing cover

22

Hole for connecting screws for fastening electronic components

23

slot nut

24

groove

Claims (13)

Drive comprising at least one drive component and a central housing part (1), with a connection area (10) and a spring area (9) being integrally formed on the housing part (1), with at least the connection area (10) being connected via the spring area (9) to the remaining housing part (1) is connected, wherein the connection area (10) for non-positive locking Significant connection, i.e. clamp connection, of the drive component is provided, with the drive comprising a spatial area (3) for gears, a spatial area (2) for an electric motor and a spatial area (4) for electronics, with the central housing part (1) containing each spatial area (2, 3, 4) at least partially limited, the electric motor being able to be fed, controlled and/or regulated by means of the electronics and the transmission being able to be driven by means of the electric motor, the drive component being a laminated stator core of an electric motor part, the connection region (10) serving as a torque support for the drive component is formed, with a form-fitting connection, namely a feather key connection, being provided in such a way that if the force-fitting connection fails, the form-fitting connection occurs to prevent a rotary movement of the stator (17) against the central housing part (1), the deflection direction of the spring region ( 9) is provided radially to the rotor axis of a motor. drive after claim 1 , characterized in that a heat barrier is provided between the space (4) for the electronics and the central housing part (1). drive after claim 1 , characterized in that the space (4) for the electronics and the central housing part (1) are provided in a thermally conductive connection to dissipate heat from the electronics to the environment. Drive according to at least one of the preceding claims, characterized in that the housing part (1) comprises at least one bearing seat (7) for the bearing of the output shaft and one bearing seat (6) for the output-side bearing of the rotor (18) of the motor. Drive according to at least one of the preceding claims, characterized in that at least one shaft sealing ring is provided to seal off the gear area from the environment and a shaft sealing ring to seal off the motor area from the gear area. Drive according to at least one of the preceding claims, characterized in that at least one sealing surface (20) is provided on the housing part (1), on which another housing part (1), namely the housing cover, can be tightly connected. Drive according to at least one of the preceding claims, characterized in that the running surfaces for shaft sealing rings and/or sealing surfaces (20) for seals are arranged and provided in such a way that the sealing function remains undisturbed even with elastic deflection of the spring area (9) to produce the non-positive connection . Drive according to at least one of the preceding claims, characterized in that the sealing surface (20) is provided on the edge area of a box-shaped formation of the housing part (1). Drive according to at least one of the preceding claims, characterized in that the box with the seal surrounding the sealing surface (20) represents a heat barrier between the further housing part (1) and that housing area of the central housing part (1) which is adjacent to the stator core of the motor . Drive according to at least one of the preceding claims, characterized in that the further housing part (1) is designed as a heat sink with cooling ribs and/or cold fingers. Method for producing a device, comprising at least one component and a housing part (1), characterized in that a connection area (10) and a spring area (9) are integrally formed on the housing part (1), with at least the connection area (10) over the spring area (9) is connected to the rest of the housing part (1), the connection area (10) being provided for the frictional connection of the component, the housing part (1) being die-cast in the space area (2, 3, 4) required for installing the Transmission, the electronics and/or the motor are provided, are manufactured in such a way that a respective slide is pulled out at the end of the casting process, the pulling direction of the slide during die casting for a first spatial area (4), i.e. the spatial area for accommodating electronics, is perpendicular to the drawing direction of the slide during die casting for the space (2, 3) for the engine and transmission. procedure after claim 11 , characterized in that the deflection direction of at least one spring area (9) is provided radially to the rotor axis of a motor. procedure after claim 11 or 12 , characterized in that the deflection is effected by a tie rod or screw which is provided perpendicular to the pulling directions of the or all slides.

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