EP1050685B1 - Hydraulic linear slider - Google Patents

Abstract

A cylinder and working chamber are formed in the slide (10), and the piston (24) is fixed in relation to the housing (11). T slide has a prismatic form. The sliding guide (12) in the housing is manufactured by a casting process. The piston divides the cylinder into two separate working chambers (13,29), the volume increase of which leads to opposed movement of the slide. Hydrau fluid lines are led to the working chambers through the piston and piston rod connected to it.

Description

The invention relates to a Linearwegschieber according to the preamble of claim 1.

Linear path slider of the type mentioned are used as actuators in various facilities for the processing and processing of metallic materials and plastic or plastic composite materials. The tasks of these assemblies typically include pressing, forming, embossing, bending, crimping, punching, cutting, joining, joining presses and the execution of delivery functions with special requirements. The properties of the Linearwegschieber special requirements are made, including in particular a very high energy density, a very high guidance accuracy and a very high stiffness against shear forces and against rotation. Furthermore, they should have the most compact design possible and allow a standardized basic assembly a flexible, universal use. Furthermore, properties such as maintenance-free life, a robust construction for use in polluted environments, the possibility of any installation position, absolute tightness (e.g., overhead installation), and last but not least, low cost manufacturing are desirable.

Linear Wegschieber are known in various embodiments. Due to the required high energy density, it is preferably hydraulic devices. Basically, however, the concept of a pneumatically operated device is possible.

CH-A-604021 shows a known Linearwegschieber with the features of the preamble of Ansprüches 1, which is provided for performing rectilinear reciprocating movements with a respect to the housing rotationally fixed piston rod from a cylindrical tube and two within the cylindrical tube arranged at the ends Guide bushes and a guide piece attached to the cylindrical tube consists. In this case, the piston rod is disposed within a coaxially extending to this, a rotation of the guide piece preventing cylinder housing. At least one supply line is provided for the pressure medium, which is inserted centrally into the piston rod and through the rear guide bush and which serves as a support of a false floor, which is arranged between the two guide bushes and forms two cylinder chambers, the rear of which in the supply line trained opening can be filled with the pressure medium. This is a Linearwegschieber to be created, which has a rotationally secure in the radial direction of the piston rod, which is loaded by high tensile and compressive forces and can absorb high buckling stresses, and in which the pressure medium prevent the leaking sealing elements are largely protected from injury.

DE-A-32 41 233 describes a drive unit for pressure medium drives, should remain largely unchanged in the guide accuracy, sealing and performance even after prolonged operation. In order for this drive unit with a surrounding the pressure fluid cylinder cladding tube, which is secured to the piston rod and slidably held in a direction extending in the frame guide, can meet these requirements, on the outer surface and the inner surface of the cladding separate intermediate links of low-friction lubricant for lateral support the pressure medium cylinder provided on the frame-fixed guide. As a result, the sliding properties are to be improved on both surfaces of the cladding tube, so that the support can be made more direct and accurate.

A fluid-actuated feed unit is described in DE-A-5,609,091, which should have a compact design with precise guidance and simultaneous rotation of the feed part. This is achieved in that the feed part is formed at least along its guided in the housing length portion as a three-sided prismatic body, which is guided in the region of its three side surfaces in the housing, while the three transition areas are circulated between each two adjacent side surfaces. Due to this shape of the guided length portion of the feed part an extremely resilient rotation is to be achieved. The flat side surfaces of the prismatic body to ensure precise guidance.

Combinations of commercially available linear cylinders are particularly well-known as compact built-in modules, which are formed with rigid linear guide units by "saddling on" or by forming a constructional longitudinal combination.

From DE-GM 71 04 168 a hydraulically or pneumatically acting slider for moving or pivoting of blades, flaps or containers is known in which the hydraulic working spaces are formed in the punch of the device. To protect the piston rod of the device used in rough operation from dirt, stone chips and the like, it is surrounded by a protective sleeve. The slide is guided solely by the piston rod and therefore has no torsional rigidity. It is therefore suitable only for the absorption of linear forces.

Furthermore, hydraulic block cylinders are known, the housing having additional holes for guide rods, which are arranged parallel to the actual hydraulic cylinder. The piston rod head and one to usually a maximum of four guide rods are bolted together in a rigid top plate. This arrangement ensures flexural rigidity and security against twisting.

Furthermore, from DE 295 17 615 U1 a Linearwegschieber known with a slide which is mounted displaceably movable in a housing with a roller guide and against rotation, and with a hydraulic drive, which causes the sliding movement of the slide and which one in a cylinder to form a hydraulic Working space displaceably mounted piston has. Due to the only selective support of the slide on the rollers, however, the security against rotation and the possibility of receiving lateral forces are limited.

Furthermore, the Linearwegschieber on a relatively large axial length.

For the particularly high demands in the field of cutting tools, another embodiment of a Linearwegschiebers known (manufacturer: Heidel GmbH and Co. KG, Viersen, Germany). This is characterized by a prismatic slide with usually rectangular cross-section. The pusher core is guided with a cast housing by a special high-load Gleitführungstechnik completely backlash-free and maintenance-free (for life). The slider has a pocket, in the side of the axis of movement a special hydraulic cylinder is used. This hydraulic cylinder has a piston with two continuous piston rods or with a piston rod and a driving groove, which act on the end faces of the pocket in the slider and thus transmit the pressure forces for a forward and backward movement of the slider. The hydraulic special cylinder has a mounting flange on one longitudinal side, with the aid of which it is screwed to the valve body. For this purpose, the slider housing has an opening on its upper longitudinal side. The hydraulic oil connections are also located on this mounting flange. It is both a lateral as well as an upward connection with appropriate guidance of the pipes possible to meet different, cramped installation conditions. The Linearwegschieber described is characterized by its high-load capability and the precise sliding of the prismatic slide. Its use, however, is limited in some cases by the size and weight. Furthermore, a repair of Linearwegschiebers is relatively expensive.

The invention has for its object to achieve a more compact design with a reduced volume and a reduced weight at a Linearwegschieber of the type mentioned. At the same time the Linearwegschieber easier to repair and be flexible in its applicability. Last but not least, the production costs should also be reduced.

This object is achieved by the features specified in claim 1.

Accordingly, the Linearwegschieber invention is formed in such a way that the cylinder and the working space are arranged in the slide, that the piston is fixed relative to the housing, that the piston divides the cylinder into two separate work spaces whose volume increase in each case to an opposite movement of the Slider leads, wherein two supply lines are provided for the hydraulic fluid to the working chambers, which consist of a central, through bore in the piston rod and an additional central tube, which is arranged in the bore, via the central tube hydraulic fluid in the first working space at the bottom of the piston and via the bore hydraulic fluid is supplied to the second working space, wherein a housing closing the rear piston rod latch a sensor for detecting an end stop position for the slide and the piston rod latch a square basic shape, d It fits through the square opening at the back of the housing so that the piston rod can be inserted through the square opening in the interior of the housing into the area of a cylindrical extension, so that after rotation of the piston rod bolt by 45 ° this with its corners according to Art a bayonet fitting behind the cylinder over the wall projecting side centers of the rear square opening of the housing and the piston rod latch is secured in the housing position, and by means of a through the housing wall is locked to a corner of the piston rod bolt locking bolt, the housing having at its back a square opening which widens inwardly to a cylinder and the diameter of the cylinder between the length of one side of the square opening and the length of the Diagonal of the square opening lies.

Under a "cylinder" is not necessarily a cylinder in the mathematical sense, ie with circular cross-section to understand, but each bounded by parallel walls working space in which a piston whose cross section corresponds to the cross section of the working space, move parallel to the walls can. In addition to a mathematical cylindrical shape, the "cylinder" in the sense of the claims may in particular also have a cross section in the form of a regular polygon.

In the Linearwegschieber invention, the functions of the slide and the hydraulic drive are combined in one assembly. This is possible because the hydraulic drive is integrated in the slide itself. This measure results in numerous advantages. Thus, the omission of two separate components (slide, hydraulic drive) allows a more compact, slimmer design while saving volume. In addition, components are saved (e.g., cylinder bore housings and mounting flange), thus achieving high cost and weight savings. The elimination of joints where e.g. the mechanical application of pressure from the hydraulic drive to the slide takes place, leads to a further reduction of manufacturing costs and to avoid potential sources of error.

Furthermore, in the Linearwegschieber invention the arrangement of slide and hydraulic drive with high symmetry can be done by the cylinder and the piston are arranged on the central axis / axis of movement of the slider. This creates a centric and symmetrical force introduction, which avoids the occurrence of tilting moments. This leads to less parasitic stress and increases the reliability and longevity of the assembly. In Linearwegschiebern according to conventional design would have resulted in a corresponding symmetrical design to significantly larger designs with an unacceptable specific performance.

With the prismatic design of the slider high precision and high rigidity is achieved.

It is particularly advantageous if the sliding guide, which is arranged between the slide and the housing, is produced by a casting method. On the one hand, such a casting process leads to a high-quality sliding guide and at the same time is very cost-effective.

By dividing the cylinder into two separate working spaces through the piston, with an increase in the volume of the working spaces each leading to an opposite movement of the slide, it is possible by the inflow of hydraulic fluid and a pressure introduction into the corresponding working space both an active pre as well to bring about an active return movement of the slide. The fact that the piston bisects the existing cylinder space, an optimal utilization of this space is achieved at the same time.

It is also advantageous that the piston is arranged at the end of a piston rod which has a smaller diameter than the piston and which is guided on one side of the slider to the outside. The implementation of the piston rod is completely sealed, so that no hydraulic fluid can escape. In this arrangement, the piston divides the cylinder space into two working spaces, which may be referred to as lying on either side of the piston rod. A supply line for the hydraulic fluid in the respective working spaces affects on different sides of the piston and therefore leads to corresponding opposite forces on the slide.

To perform their function, the hydraulic work spaces must be provided with a supply line for a hydraulic fluid (e.g., oil). This supply line is arranged in the piston and in the piston rod connected to the piston. Such an arrangement makes use of the fact that the piston in the Linearwegschieber invention is on the one hand fixed and on the other hand forms part of the boundary walls of the working space. Therefore, the supply of the hydraulic fluid can be smoothly guided from an external terminal through the piston rod and the piston to the place of use (and back). This of course also applies if, as in the embodiment of the invention described above, two working spaces are formed within the slide.

In this case, in which two different working spaces are supplied with supply lines through the piston, these supply lines are arranged concentrically in the piston.

Furthermore, a sensor for detecting an end stop position is provided on the piston rod latch. As a result, it can be determined and monitored whether the slide is located at one of the attachment points. This information is usually important for the higher-level processing process, so that the precise detection of this state can be advantageously exploited to control the overall process.

Advantageous embodiments of the invention are characterized in the Unterausprüchen.

Furthermore, the piston is releasably connected to the housing, wherein as a connection type in particular a screw and / or bayonet connection comes into consideration. By detaching the piston from the housing maintenance and repair of Linearwegschiebers is possible. In this case, only one component is to be solved in order to simultaneously gain access to the hydraulic chamber and the slider. The maintenance of the Linearwegschiebers is thereby considerably simplified, which is reflected in lower operating costs and a longer life.

Fig. 1

eine Aufsicht auf den Linearwegschieber während eines Arbeitshubes;

Fig. 2

ein Detail der Aufsicht auf den Linearwegschieber;

Fig. 3

eine Rückansicht eines Linearwegschiebers mit einem Fußflansch;

Fig. 4

eine Rückansicht eines Linearwegschiebers mit Durchgangsbefestigungsschrauben;

Fig. 5

eine Rückansicht eines Linearwegschiebers mit einer Steck-Dreh-Zylinderstangen-Verriegelung;

Fig. 6

eine Ausgestaltung eines Linearschiebers mit teilweise nicht erfindungsgemäßen Merkmalen und mit einer Zylinderhülse, die in einem Sackloch des Schiebers angeordnet ist.

Embodiments of the invention are explained below with reference to the drawings. Show it

Fig. 1

a plan view of the Linearwegschieber during a working stroke;

Fig. 2

a detail of the plan view of the Linearwegschieber;

Fig. 3

a rear view of a Linearwegschiebers with a foot flange;

Fig. 4

a rear view of a Linearwegschiebers with passage fixing screws;

Fig. 5

a rear view of a Linearwegschiebers with a plug-in rotary cylinder rod lock;

Fig. 6

An embodiment of a linear slide with partially not inventive features and with a cylinder sleeve which is arranged in a blind hole of the slider.

In Fig. 1 is a plan view of a Linearwegschieber 100 according to the invention is shown, wherein in the upper half of the image, the housing 11, the slider 10, the piston and the piston rod are shown partially broken to make the inner structure recognizable. The Linearwegschieber 100 has a compact and substantially cuboidal design. It consists of a housing 11 having at its lower end a Fußflansch with holes 17 for mounting screws and dowels for mounting the Linearwegschiebers on a machine (see also Fig. 3). Further, a groove 18 for receiving a feather key on the mounting surface is arranged on the underside of the housing 11.

In the housing 11, the slider 10 is displaceably arranged in the direction of the longitudinal axis of the housing (horizontal in Fig. 1). The slider is preferably made with a square core. The slider 10 has an externally accessible mounting surface 16, in which one or more threaded holes 15 are embedded for the mounting screws. In this way, depending on the application, various elements can be connected to the slider 10. The slide 10 is mounted displaceably movable in the direction of its longitudinal axis and can move out of the housing 11 by the length of its working stroke. Typical strokes are between 30 to 100 mm, with special versions also up to 500 mm. The forces which the slider 10 must apply in the axial direction (longitudinal forces) are in the range of 10 kN (1 to) to 100 kN (10 to), in some cases up to 250 kN (25 to). As a result of eccentric loading of the slide during operation, the transverse forces on the slide may even amount to a multiple of the nominal compressive force. However, no appreciable bending or twisting of the slider should occur. These requirements are particularly high in cutting tools in which in the extended (working) position in the presence of said lateral forces a rigidity must be ensured, in which the lateral deflection is less than 0.02 mm.

To meet these high-load precision requirements contributes not least a special slide 12, which is arranged in the gap between the slider 10 and the housing 11. This sliding guide is preferably produced by a casting process.

The inventive feature of the Linearwegschiebers shown in Fig. 1 is that the hydraulic drive in the slide 10th is integrated. On the back of the slider 10, that is, on the mounting surface 16 opposite surface is a blind hole. The slide 10 forms together with the blind hole the cylinder of a hydraulic drive, wherein in the blind hole, a piston 24 is mounted with a piston rod 31 and defines the hydraulic working space 13 together with the blind hole.

At the back of the Linearwegschiebers 100, the supply lines 14 for the hydraulic fluid and an end stop sensor 19 are arranged. These elements are explained in more detail with reference to FIG. 2.

Fig. 2 shows an enlarged view of the structure of the integrated into the slide 10 hydraulic drive. In the illustration, the housing 11 has been covered and drawn in the upper part of the figure, a section along the central axis. From the slider 10, the section with the blind hole is shown substantially. In the blind hole, as described above, the piston 24 is movably supported (along the horizontal longitudinal axis in FIG. 2). The piston 24 has at its outer periphery a circumferential groove 25 in which a piston seal and guide belts are located. Between the piston 24 and the slider 10 thus a dense hydraulic working space 13 is formed.

The piston 24 is fixedly arranged at the end of a piston rod 31. The piston rod 31 is in turn fixedly connected to the housing 11 and is at the rear end on the rear wall of the housing 11, the so-called piston rod latch 32, out. On this protruding end of the piston rod 31, two oil connection flanges 14 are placed and locked with a tensioned clamping nut 22. Furthermore, the piston rod 31 has a central bore 27 along its longitudinal axis Bore 27 is closed at the rear end (on the right in FIG. 2) by the clamping nut 22. Furthermore, 31, two radial bores 21 are arranged at the rear, protruding from the housing 11 end of the piston rod 21, which come to rest under the oil connection flanges 14 and the introduction of hydraulic fluid into the central bore 27.

At the other end of the piston rod 31, to which the piston 24 is attached (left in Figure 2), the central bore 27 is continued with a smaller cross section through the piston and thereby forms the oil outlet 23 into the working space 13 inside. Furthermore, a tube 28 is arranged parallel to the central axis of the piston rod 31 as a central conduit for the hydraulic fluid. This leads at its front end sealed in the oil outlet 23 in the piston 24 and is sealed at its rear end (on the right in Fig. 2) with a seal 33 against the wall of the central bore 27. This results in a completely sealed supply line for hydraulic oil, which starts at the rear of the two oil connection flanges 14 and leads through the rear supply bore 21 for the hydraulic fluid and the interior of the tube 28 to the working space 13. By introducing hydraulic fluid along this path, a pressure is generated in the hydraulic working space 13. The device reacts to this pressure with a displacement of the slider 10 in the extension direction (on the left in FIG. 2, see arrow in FIG. 1).

With the device described so far can thus cause an extension of the slider 10 hydraulically. On the other hand, a return movement of the slide 10 would have to take place either passively or be effected by a negative pressure in the working space 13. In contrast, to improve the force development and controllability of the return movement of the slider 10 in the embodiment, a second hydraulic working space 29 provided. This second working space 29 is formed between the back of the piston 24, the exterior of the piston rod 31, the inner wall of the blind hole in the slider 10, and the front of a piston rod seal nut 30 (equipped with seal wipers and guide bands). This working chamber 29 thus has the shape of an annular gap around the piston rod 31 around.

The piston rod sealing nut 30 is fixedly connected to the slider 10 and arranged at the rear end at the entrance of the blind hole. It thus closes the blind hole except for a central opening through which the piston rod 31 is guided. The seal nut 30 is not flush with the end of the slider, but the latter has a projection 20 beyond the seal nut. This ensures that the supernatant 20 forms a stop for the fully retracted slide. The seal nut 30 is slidably movable around the piston rod 31 and sealed against it with seals. From the front of the two oil connection flanges 14, the front of the two radial bores 21 leads into an annular gap, which is formed between the outer wall of the tube 28 and the inner wall of the blind hole 27. This annular gap leads at its front end via a radial bore 26 through the piston rod 31 into the working space 29. Thus, hydraulic oil can be supplied to the working space 29 in this way. In this case causes an introduction of hydraulic oil pressure increase in the working chamber 29, which transmits via the sealing nut 30 as a withdrawal force to the slider 10. The slider 10 can thus be actively retracted.

The housing 11 is closed at its rear by the piston rod latch 32.

Furthermore, it has a central opening through which the piston rod 31 is guided. The piston rod latch 32 thus separates the inside of the Linearwegschiebers from the outside. In the piston rod latch 32 two preferably offset by 90 ° holes are also mounted, in one of the holes of the sensor 19 is seated for the end stop of the slider 10, and the second bore of the venting of the rear slide clearance is used. The use of the holes for the end position sensor or as a vent can optionally be done depending on the design specifications by the environment. The protruding end of the sensor 19 and the cable or plug connection are in the selected arrangement in a sheltered place and are therefore safe from damage. If the hole remains free as a vent, it can be closed with a sieve stopper. In addition, however, it can also be provided with an adsorber element to absorb even a small amount of leakage oil. In this way, complete freedom from contamination (for product parts) can be ensured by hydraulic leak oil.

In addition to the rear end position sensor 19, a shift rod with adjustable switching cam can be additionally attached to the slider 10 for detecting the front end position, which is guided by a further bore in the piston rod latch 32 to the rear and the switching cam is queried by another initiator.

The two oil ports 14 are designed as freely rotatable flanges and can therefore be pivoted for mounting in any direction. Both flanges are preferably identical. They may be provided with additional throttle screws for flow rate control.

The supply of hydraulic fluid to the working chambers 13 and 29 is preferably carried out in the manner shown by a central, continuous bore 27 in the piston rod 31, in addition, a central tube 28 is inserted with a seal to supply the main working space 13 at the piston crown. By choosing suitable piston rod diameter, a special rapid traverse behavior for the return stroke can also be constructively provided.

The housing 11 has no (lateral) openings or openings, which increases its rigidity and the manufacturing cost is reduced. The additional stiffness reserves can also be used to reduce the weight of the device. Furthermore, the lack of breakthroughs facilitates the casting technology introduction of the sliding guide 12 and their processing. The simplicity of the housing allows their production as extruded or extruded. The same blank tools can be used for different stroke lengths. The provision of special lengths is also possible by simply shortening the housing and slide of the next larger version.

FIGS. 3 to 5 show variants of the linear travel slide in the rear view.

Fig. 3 shows a version in which the housing 11 has a Fußflansch, which is provided with holes 17 for fastening screws and dowel pins. Alternatively or in addition to the illustrated and at Longitudinal side of the housing 11 arranged Fußflansch, the housing may also be provided with a front flange, which is preferably arranged on the outlet side of the slide.

Fig. 4 shows an alternative housing 11 without foot flange, which has in the side walls through holes 34 for through-mounting screws.

In Fig. 5, the fastening of the piston rod bolt 35 is shown. The housing 11 has at its rear a square opening which widens inwardly towards a cylinder, the diameter of the cylinder lying between the side and the diagonal of the square. The piston rod latch 35 has a square basic shape (with rounded corners) which fits straight through the square opening at the rear of the housing 11. The piston rod latch 35 can therefore be inserted through the square opening in the interior of the housing 11. As soon as it reaches the area of the cylindrical extension, it is rotated by 45 °, so that its corners 36 in the manner of a bayonet lock behind the projecting over the cylinder wall side centers of the rear square opening in the housing 11. In this position, the piston rod latch 35 therefore not out of the housing 11 out. By means of a locking screw 37, which leads through the wall of the housing 11 to a corner of the piston rod bolt 35, it is locked in this position. This arrangement has the advantage that by loosening a single screw 37 and the rotation of the piston rod bolt 35 by 45 °, the device can be dismantled. The kompiette Movable unit can be removed after loosening piston rod latch 35 (or 32) "backwards". The plug-in rotary connection described with the aid of Figure 5 can also be designed as a multi-toothing.

6, an embodiment of the Linearwegschiebers 100 with partially not inventive features in a partially broken plan view similar to FIG. 1 is shown. Elements which are identical in construction to the preceding embodiments are designated by the same reference numerals and need not be explained again.

An inventive feature of this embodiment is that the hydraulic cylinder is no longer formed directly from the inner wall of the blind hole of the slide, but by a separate cylinder sleeve 38. This is arranged in the blind hole and on the slide 10, for example by a screw connection attached. At its inlet opening, the cylinder sleeve 38 is closed by a sealing nut 30, so that the two hydraulic working chambers are completely formed in the cylinder sleeve 38.

Such an arrangement has the advantage that the hydraulic unit is completely stored in the cylinder sleeve 38 and therefore can be completely removed from the back of the inearwegschiebers 100 without the slide itself would have to be removed. Tools mounted on the slider, such as precisely aligned knives or the like, therefore, do not need to be removed. Thus, the risk of injury to the slide 12 is excluded by the distance. Furthermore, the hydraulic fluid is encapsulated in the cylinder sleeve 38 and therefore can the Do not contaminate installation site. Finally, the expansion of the blind hole of the slider 10 is avoided because the hydraulic pressure no longer acts directly on the slider 10. This is in view of the already tight tolerances of the slide gap of considerable advantage.

Further, in Fig. 6, the feature not according to the invention is shown that the hydraulic fluid is guided via two parallel supply lines 39 and 40 in the piston rod 31 to the rear or front working space.

reference numeral

10

pusher

11

casing

12

slide

13

working space

14

Oil flange

15

threaded hole

16

mounting surface

17

drilling

18

groove

19

End position sensor

20

head Start

21

radial bore

22

locknut

23

oil spill

24

piston

25

groove

26

oil spill

27

central hole

28

pipe

29

working space

30

packing nut

31

piston rod

32

Piston rod bolt

33

seals

34

Through Hole

35

Piston rod bolt

36

corner

37

locking screw

38

cylinder sleeve

39

Supply line to the working space 13

40

Supply line to the working space 29

100

Linearwegschieber

Claims (3)

1. A linear-travel slide (100), with a slide (10) which is mounted fixedly to rotation so as to be movably in displacement in a housing (11) by means of a sliding guide (12), and with a hydraulic drive which causes the displacement movement of the slide (10) and which has a piston (24) and a cylinder mounted on the latter so as to be moveable in displacement, with a hydraulic working space (13) being formed, a concentrically arranged supply line for a hydraulic fluid being led to the working spaces (13, 29) through the piston and a piston rod (31) connected to the piston (24), the two supply lines for the two working spaces (13, 29) being arranged concentrically in the piston rod (31), the cylinder and the working space (13) being arranged in the slide (10), the piston (24) being stationary with respect to the housing (11), the piston (24) subdividing the cylinder into two separate working spaces (13, 29), the increase in the volume of which leads in each case to an opposite movement of the slide (10), two supply lines for the hydraulic fluid to the working spaces (13, 29) being provided, which consist of a centric continuous bore (27) in the piston rod (31) and an additional central tube (28) which is arranged in the bore (27), hydraulic fluid being supplied to the first working space (13) at the bottom of the piston (24) via the central tube (28) and hydraulic fluid being supplied to the second working space (29) via the bore (27), characterized in that a piston-rod bolt (32, 35) closing off the housing (11) on the rear side has a sensor (19) for detecting a limit-stop position for the slide (10), and the piston-rod bolt (35) has a square basic shape which fits through a square orifice on the rear side of the housing (11) in such a way that the piston-rod bolt (35) can be pushed through the square orifice into the interior of the housing (11) into the region of a cylindrical widening, so that, after the rotation of the piston-rod bolt (35) through 45°, the latter comes to lie with its corners (36), in the manner of a bayonet fastening, behind the side centres of the rear square orifice of the housing (11) which project beyond the cylinder wall, and the piston-rod bolt (35) is secured in position in the housing (11) and is detained by means of a securing screw (37') led through the wall of the housing (11) to one corner of the piston-rod bolt (35), the housing (11) having on its rear side the square orifice which widens inwards into a cylinder, and the diameter of the cylinder lying between the length of one side of the square orifice and the length of the diagonal of the square orifice.
2. A linear-travel slide according to claim 1, characterized in that it contains a prismatic slide (10).
3. A linear-travel slide according to either one of claims 1 and 2, characterized in that the cylinder is formed by a cylinder sleeve (38) which is arranged in an orifice of the slide (10).

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