CN101280794A

CN101280794A - Fluid operated linear motor

Info

Publication number: CN101280794A
Application number: CNA2008100913194A
Authority: CN
Inventors: K·斯托尔; S·戈格尔; R·巴克泽克
Original assignee: Festo SE and Co KG
Current assignee: Festo SE and Co KG
Priority date: 2007-04-05
Filing date: 2008-04-03
Publication date: 2008-10-08
Anticipated expiration: 2028-04-03
Also published as: CN101280794B; EP1978263A3; DE102007016431A1; EP1978263B1; EP1978263A2

Abstract

The linear drive has a housing defining a tubular peripheral wall extending between front-sided connection walls. One of the connection walls is formed by a base wall of an end cap. The cap encloses an axially immovably fixed expansion element, where the element carries an axially upstream collision surface for a piston at a front side of the connection wall. A tube section axially overlaps the element without axially supporting a radially outward piece, where the element is fixed at the housing in an area lying axially behind a front side of the element.

Description

Fluid-operated Linear actuator

Technical field

The present invention relates to a kind of fluid-operated Linear actuator, it comprise be used for can linearly moving piston shell, this shell is with the form of two terminal termination walls and tubular peripheral wall, at least one termination wall is made of the diapire of terminating cover, the sidewall of terminating cover limits a length part and itself and another length pipe member adjacency partly that limits perisporium of perisporium, terminating cover is around obturator, obturator leans against on its sidewall in inside and leans against on its diapire, this obturator with respect to terminating cover axially immovably fastening, this obturator is showed the approximal surface that is used for piston in its front side, and approximal surface is in the front portion that axially is positioned at the termination wall.

Background technique

Announce under the situation of the Linear actuator of disclosed such known fluid operation in EP 0837248 B2 number at European patent, shell is made up of pipe member and two terminating covers that are arranged on its end, obturator is placed in each terminating cover and in its front side towards the piston of Linear actuator has circular element, and this circular element has the approximal surface that is used for piston.Obturator is in radially extending to the shell recess, and this shell recess is defined by the bag shape portion in the termination wall and the end face of pipe member.Because this pipe member has relatively large wall thickness, thereby has caused a large amount of needs for material, the result has caused the high cost of production and relative heavier weight of Linear actuator.

Announce in DE 10141560 C2 numbers at D.B.P. and to disclose a kind of Linear actuator with the wall thickness that reduces.The termination wall separates with the pipe member of shell, and in this case, the termination wall is made up of the integrated type end plate of outer cover of relative heavy wall, and this end plate of outer cover directly limits the approximal surface of piston.When being expected at, the shell of Linear actuator uses in the corrosive medium and must be manufactured with better quality the time, although the characteristics in this design help economical production in others, but because the required relative wide variety of materials of end plate is still relatively costly.

The Linear actuator of announcing described in the 44 16 726 C2 number at D.B.P. really makes whole casing may have the wall thickness of relative thin.Yet because this is complete integrated type shell, therefore manufacturing is an extremely strict process and needs investment cost greatly aspect manufacturing machine and personnel.

U. S. Patent the 4th, 312 discloses a kind of drive cylinder No. 264, and this drive cylinder has cylinder barrel, and cylinder barrel extends on two cylinder caps fully and sealed by end plate.Cylinder cap is attached on the end plate.

U. S. Patent the 2nd, 518 discloses a kind of drive cylinder No. 787, and it has two sleeves that surround each other coaxially, and sleeve has the end cap of assembling on them in the end.Attached in order to carry out, be provided with closure member, inner sleeve leans against on the closure member via snap ring and closure member passes the end cap that has outside attachment nut and screws on.

Summary of the invention

Free-revving engine of the present invention is, for the Linear actuator of the type that begins to mention, provides the measure that may carry out more economic manufacturing.

In order to achieve this end, pipe member is assemblied on the obturator, but axially do not leaning against above it, keeping some axial distance and have the centering effect simultaneously at radially outer, obturator is secured on the shell in the part at the rear portion that axially is arranged in its front side.

Therefore, no longer need pipe member working on the obturator to secure it on the shell in the end.Attached front side in addition the position that betide it towards piston of obturator on shell.Therefore, pipe member can make its wall thickness just be reduced to enough to guarantee against the degree of the necessary intensity of pressure.This relates to the saving of material and alleviating of weight.Because specific service condition must be when forming such as the high-quality material of stainless steel or similar material, this potential saving (alleviating) is very important when shell.Be under the situation of same piston diameter, to have reduced total outside dimensions of shell according to another advantage of attachment means of the present invention.When keeping the same external diameter of shell, may have than piston diameter bigger under the prior art situation, and this allows higher steering force.At last, because also there is the simplification of assembling aspect in the effect of the centering of obturator.

In addition, other favourable development of the present invention limits in independent claims.

Preferably, obturator only is attached on the terminating cover.In this case, pipe member does not play any effect aspect the shell in that obturator is fastened to.This causes and may especially simply assemble, and this is because pipe member can be secured on the element of construction that comprises terminating cover and obturator that had before assembled.

Except the centering measure, will not be favourable with the obturator cooperation if pipe member only is attached on the sidewall of terminating cover.In this case, produce airtight welding joint by laser bonding especially.Wherein, pipe member and will to join that terminating cover on the pipe member is made up of stainless steel to will be especially favourable.

In principle, may adhesively be attached to obturator on the terminating cover or be fixed on the terminating cover with some alternate manner to provide convolution to connect.Yet, more particularly, consider the possibility that needs separable joint, preferably between two members, have screws.

In order to produce screws, obturator may have at least one tapped hole, uses tapped hole, by with the attachment screw cooperation, obturator can be connected with terminating cover, is screwed into attachment screw from the outside and its head is leaned against on the outside of terminating cover.In this case, its direct or indirect adjacency is possible all.When attachment screw during simultaneously also as retaining mechanism, consider indirect adjacency especially, retaining mechanism is used for Linear actuator outside attached on housing exterior.For this purpose, for example, consider to be used for the retainer of footing attached (foot attachment) or joggle attached (joggle attachment).

Only can use an attachment screw or simultaneously several attachment screw obturator is fastened on the terminating cover that is associated.In this case, especially axially be screwed into attachment screw.

Be designed to have at Linear actuator under the situation of the cylinder that is attached to the piston rod on the piston, comprise that at least one sub-component of terminating cover and obturator makes piston rod pass its extension in the mode of sliding.In this case, using attachment screw that obturator and terminating cover are interconnected will be favourable, attachment screw encirclement piston rod and with the form of hollow screw.And this hollow screw also can have one or more structural members simultaneously, these structural members are to comprise one or more in the group of sliding bearing (plain bearing) face, seal ring and ribbon toroid (strip ring), and these structural members lean against on the outer circumferential face of piston rod.Hollow screw is provided preferably with all these three kinds of structural members, and when one in these structural members wearing and tearing taking place, releasable screw is attached to be guaranteed to change fast.

Fluid line preferably also extends through obturator and is used for the in check fluid actuated of piston.This fluid line is provided with the port in the outside of shell, can utilize this port to connect fluid line to be used for supply and to remove operating fluid via proper port mechanism.These port mechanisms preferably are not the members of obturator and can be provided on the sleeve shape port element with necessary total length, the sleeve shape port element is with combination in the opening of airtight mode in the wall of terminating cover, for example, by be welded on top or brazing in the above.Therefore, inner sealing mechanism must not arranged at obturator and between around its shell.

Linear actuator of the present invention makes that whole casing may be designed to have identical wall thickness.Aspect this, may take the extremely thin member of wall so that economical with materials is arranged and the possibility greatly of weight reduction.Because obturator and the complete block of environment are opened, it can be made up of the physical property less material more relatively poor than steel (for example, aluminium material or polymer material and more particularly plastic material).In this regard, also may utilize the light especially material of weight.

Particularly advantageously make Linear actuator have following design: in this design, in mode according to the present invention, two termination walls are made up of terminating cover, terminating cover is provided with obturator, and independent pipe member is in extension between two terminating covers and axially be assemblied in radially outward a distance on two obturators.Under the situation of two terminating covers, can be identical in the measure of end attachment tubes linear element.About the attachment means between terminating cover and obturator, can consider multiple different possibility, for example, it is possible using the screws of hollow screw on distolateral, and it is attached at the different screw of relative distolateral employing, for example, install the outside of using retainer to be used for Linear actuator simultaneously.

Can produce terminating cover by the system of revolving or by deep punch method, especially when terminating cover is made of metal.

Description of drawings

Hereinafter, will at length explain the present invention referring to accompanying drawing.

Fig. 1 is the front portion perspective view sideling from the preferred work example of fluid-operated Linear actuator.

Fig. 2 shows the Linear actuator of Fig. 1 with the perspective view of observing obliquely from behind.

Fig. 3 is the side view of Linear actuator, and wherein part shows the part of the attachment means between terminating cover and the obturator with analysing and observe.

Fig. 4 analyses and observe the longitudinal section along the part that the hatching IV-IV among Fig. 2 is intercepted.

Fig. 5 is the front view of the Linear actuator watched of the direction of the arrow V in Fig. 1.

Fig. 6 is the rear view of the Linear actuator watched in the direction of the arrow VI of Fig. 2.

Embodiment

Be designated 1 Linear actuator on the whole and drive by fluid dynamic, driven medium may be liquid medium or gaseous medium.Medium is pressurized air preferably.

Linear actuator 1 has elongated shell 2, shell 2 have preceding termination wall 3 and back termination wall 4 and between them at axially extended tubular peripheral wall 5.Preferably, shell 2 is cylindricality on the whole and is cylindrical especially.

Be provided with piston 7 in the inside of shell, piston 7 slides on the direction neutral line ground of the longitudinal axis 6 of shell 2, and it connects with the driving output 8 motion ground that can contact from the outside of shell 2.Output driving part 8 is piston rod 8a preferably, the part that termination wall 3 extended and it is positioned at the outside of shell 2 before it passed in outside direction is provided with male thread 12 or some other attachment means, the fastening separably thereon member that will be shifted or locate (for example, the part of machine).

Piston 7 along slided by the piston hole that inner face limited of perisporium 5 surface 13 and be provided with around sealing mechanism 14, its axially-spaced (contact with piston hole surface 13) preceding work chamber 15 by mode with fluid-tight and after work chamber 16.

Shell 2 is opened and extended through to

fluid line

17 and 18 in each

work chamber

15 and 16, pipeline is opened to the outside of shell 2 at port one 9, and therefore illustrated fluid pipe-line 21 may engage with suitable bindiny mechanism 22 in separable mode.

Utilize supply and discharging by the in check driving fluid of

fluid line

17 and 18, piston 7 and the output driving part 8 that therefore connects with its motion ground can be actuated to carry out linear motion 23 in the direction of axis 6, are represented by double-head arrow.

Shell 2 only is made up of three members.They be preceding terminating cover 24, back terminating cover 25 and separate with them and between them at axially extended pipe member 26.Terminating

cover

24 and 25 is bowl-shape or cup-shaped, each has diapire 27 and another ring-type or sleeve shape sidewall 28, diapire 27 crosses longitudinal axis 6 and extends and constitute the preceding termination wall 3 and back termination wall 4 that is associated, and sidewall 28 and diapire 27 adjacency are especially via the transition portion adjacency of bending.

The diameter of the pipe member 26 preferably diameter with sidewall 28 is identical.Pipe member 26 it the two ends contiguous engagement to respective front ends connect cover 24 with the opposite faces of sidewall 28 of back terminating cover 25.The wall thickness of terminating cover 24 and terminating cover 25 is preferably identical throughout with the wall thickness of pipe member 26, takes to have the structure of relatively thin wall.In work embodiment, if piston external diameter is about 125mm, then wall thickness is in the scope of about 1.8mm.Preferably adopt metal (particularly stainless steel) as being used for the material of terminating cover 24 with terminating cover 25 and pipe member 26 with good physical properties.Can cut predetermined length as pipe member 26 from tubing.Can make terminating cover 24 and terminating cover 25 in the mode of economy by deep draw or the system of revolving.

Using stainless steel to make may use in containing the environment of corrosive medium.This will be applied to the application of (for example) medicine and food-processing industry, and wherein Linear actuator is regularly exposed to the erodibility cleaning substance.For piston rod 8a, by the same token, will adopt stainless steel, promptly antirust steel (rust-proof steel).

The perisporium 5 of shell 2 is limited by the sleeve shape or the circular side wall 28 of pipe member 26 and two terminating

covers

24 and 25 with engaging.In this case, piston hole surface 13 only is positioned on the pipe member 26.

Basically

independent casing component

24,25 and 26 is bonded together securely and unites in inseparable mode especially.Especially use by airtight 32 joints that produce that are welded to connect as the ring-type contiguous engagement between the member.Consider laser bonding especially, wherein unite these members and need not circumferentially externally supplying welding consumables in airtight mode.

In the inside of shell 2, be provided with by the preceding obturator 23 of preceding terminating cover 24 sealings with by the back obturator 34 of back terminating cover 25 sealings.Obturator 33 and 34 is axially facing toward the diapire 27 that is associated and is radially leaning against on the sidewall 28 that is associated.Each

obturator

33 and 34 is made up of and material that preferably weight is lighter more cheap than all the other materials of shell.In this example, it may be aluminium material or polymer material, especially plastic material.

Each

obturator

33 and 34 length (as measured in the direction of longitudinal axis 6) are slightly greater than the terminating cover 24 that is associated and 25 the degree of depth (measured in identical direction).Therefore, each obturator 33 extends beyond terminating

cover

24 and 25 certain distances " x " and extends to slightly in the pipe member 26 of adjacency in a side relative with diapire 27 with 34.

Obturator

33 and 34 this protrude length part and cross shape in the size of longitudinal axis 6 at it and make that about at radially slightly outwards outstanding pipe member 26, it carries out centering function.Therefore, even before utilizing welding operation 32 package shells 2, may be in this

way terminating cover

24 and 25 with pipe member 26 between produce centering and accurately coaxial the aligning and need not complicated centering operation.

Obturator

33 and 34 constitutes mechanical mechanism, and it defines

work chamber

15 and 16 on the axial opposite side of piston 7.Each

obturator

33 and 34 front side (axial vane surface is to piston 7) have approximal surface 35, and when finishing linear motion 23, piston 7 limits its end position near approximal surface 35 adjacency.Approximal surface 35 can be provided on the independent adjacent body, and separately adjacent body is arranged at preferably on the integrated

type obturator

33 and 34, for example, is fastened to the buffer element of obturator 33 and 34.Yet in work embodiment, its front-end face by

corresponding obturator

33 and 34 directly forms.

Each obturator 33 with 34 with respect to the terminating

cover

24 and 25 that is associated at axial restraint.All attachment means that are provided for this purpose are arranged in

obturator

33 and 34 these parts towards diapire 27 adjacency that are associated, and under current situation, (obturator 33 and 34) front portion directly is made of approximal surface 35.Attachment means only limits to this part, and the front-end face of obturator 33 (towards piston 7) and being not used in is attached on the shell especially.

Preferably, each

obturator

33 and 34 only is fixed on its terminating

cover

24 and 25 on every side.Pipe member 26 does not participate in this attached.Only be connected and cause axially firmly being connected between pipe member 26 and

obturator

33 and 34 by firm between pipe member 26 and terminating

cover

24 and 25, pipe member 26 with firm the

connection obturator

33 and 34 that is associated is fastened on the pipe member 26 between terminating

cover

24 and 25.

The assembling Linear actuator 1 during, at first, be mutually related terminating

cover

24 and 25 with

obturator

33 and 34 formation corresponding units, its be assembled in together and in firm mode axially secured to one another.Then, pipe member 26 at axial slip, axially is being connected with sidewall 28 on obturator 33 and the 34 length parts of protruding above sidewall 28 securely.Yet, only when comprising that the piston 7 and the sub-component 7 of output driving part 8 just carry out this operation after putting into wherein.

In principle, each

terminating cover

24 and 25 be incorporated into it in

obturator

33 and 34 between may have and engage relative convolution with interlocking and engage.For example in fact, these members may be with adhesion in conjunction with or weld together.

Yet, preferably provide interlocking to engage as attached basis, it is indicating more rational production.This is the situation of work example.In this case, each

obturator

33 and 34 remains on terminating

cover

24 and 25 firmly by attachment means 36, and attachment means 36 leans against on the terminating

cover

24 and 25 that is associated and is assemblied in

obturator

33 and 34.

On this basis, (for example) can be expected by the function that joggle engages

obturator

33 and 34 being fastened on the sidewall 28 of periphery around it.

Different therewith, the work example provides screw to connect.Be provided at least one attachment screw 37 as attachment means 36, the thread spindle 39 of attachment screw 37 passes terminating

cover

24 and 25 from the outside wall split shed 38 inserts and is screwed in the hole 42 of band box thread obturator 33 and 34.The head 40 of attachment screw 37 (it is wideer than axle 39) adjacency on the outside of terminating

cover

24 and 25.

The hole 42 of band box thread is preferably in axially (promptly in the direction of longitudinal axis 6) extension, and attachment screw 37 is passed diapire 27 and extended.It is attached that sidewall 28 need not to be used for this type of screw.Attachment means 36 only

termination wall

3 and 4 with the

obturator

33 and 34 that is associated between work and not with sidewall 28 cooperation.

May be in an advantageous manner near the front side of shell forward the central opening 45 (piston rod 8a passes this central opening 45 and extends) in the obturator 33 be provided with box thread and may be with the form of tapped hole 42.In this case, adopt hollow screw 37a as attachment screw 37, it is before slippage is gone up and passed the wall opening 38 that is associated and be screwed into to piston rod 8a coaxially in the opening 45 in the obturator 33.

Advantageously, hollow screw 37a plays the effect of plain bearing surfaces 46 simultaneously so that piston rod 8a moves in the above, and in the past work chamber 15 and ribbon toroid 48 run off and prevent that dirt from entering to avoid fluid thereby be provided with seal ring 47.These three members surround piston rod 8a in each case coaxially and play the effect of sliding bearing mechanism in its periphery.Seal ring 47 and ribbon toroid 48 can be united sealing and the ribbon toroid for combination.Plain bearing surfaces 46 may be the member that is anchored on the sliding bearing sleeve pipe among the hollow screw 37a.

A place or many places take place to carry out the quick replacing of hollow screw 37a possibly under the situation of wearing and tearing on one of them at these members.

Above-mentioned member may only partly be provided among the hollow screw 37a and remaining part (for example) in the filling main body 33 that is associated.

Be located at the inner face cooperation of seal ring 52 and opening 45 around the thread spindle 39 of hollow screw 37a and avoid undesirable fluid to spill.

On the rear side of Linear actuator 1, around longitudinal axis 6, be distributed with some tapped holes 42, tapped hole 42 is filled in the main body 34 in the back and is being formed with certain axial depth, in each case, is screwed in it as the attachment screw 37 of standard element.In this example, provide four attachment screw 37, it is placed in position, virtual foursquare angle, and virtual foursquare center is on longitudinal axis 6.

Above-mentioned four rear portion attachment screw 37 can be carried out multiple function, and this is because they constitute outer retainer 53, and it is applicable to the outside attached of Linear actuator 1, and externally lean against propelling back terminating cover 25 on the diapire 25 securely.The substrate that attachment screw 37 is passed retainer 52 extends, and the head 40 of attachment screw 37 is pushed against on the substrate.

In this example, retainer 53 is so-called pivot flange, and it makes the joggle bearing connect may be used for Linear Driving.Yet, as an alternative, may use retainer 53 with different designs, for example, so-called footing attachment component utilizes the footing attachment component rigidity to be installed on the member.

In order to be defined for retainer and/or to be used for directly outside attached attachment interface, tapped hole 42 also can be located in

obturator

33 and 34, its have the wall opening 38 of aligning and be not mainly used in provide terminating

cover

24 and 25 and

obturator

33 and 34 between firmly or permanent joining.In Fig. 1, the diapire 27 of preceding terminating cover 24 represent this situation with dot and dash line, that is to say preferably have even distribution around central opening 45.

If terminating

cover

24 and 25 has circular cross-section and if the

obturator

33 and 34 that is associated also is circular, on the periphery of

obturator

33 and 34, also may provide complementary screw thread with

obturator

33 and 34 of may screwing at the interior Zhou Shanghe of sidewall 28 so, and need not directly arrive terminating

cover

24 and 25 interior independent attachment screw.

The

fluid line

17 and 18 that extends from port one 9 passes

obturator

33 and 34 extensions and open in its front side 35 towards piston 7 that are associated.Therefore, each

fluid line

17 and 18 partly extends in

obturator

33 and 34 and partly passes the sidewall 28 that is associated and extend.Preferably, above-mentioned port one 9 is formed in the sleeve shape connecting element 54, sleeve shape connecting element 54 is inserted in the opening 55 in the sidewall 28 and is fixed on here in the mode of sealing, for example, by between material, having airtight combination, for example, the use is welded to connect or brazing engages as combination.On this connecting element 54, also be provided with bindiny mechanism 22, for example, with the form (as shown in the figure) of box thread or to insert the form (not shown) that engages.

Be provided with ring-type or frame shape packing ring or sealing between each diapire 27 and the

obturator

34 and 35 that is associated, it engages ground around all wall openings 38 that are formed in this diapire 27.This is used to be avoided undesirable leakage.In this case, in the transition zone 51 between connecting element 54 and the

obturator

33 and 34 that is associated, it also is feasible not having indivedual sealings.Under the situation of schematic structure, may allow obturator 33 radially contacting with the operating fluid that flows around it with 34.

In transition portion 51, obturator periphery preferably smooth so that obtain retention mechanism, it has been avoided because the connecting element 54 of adjacency and with respect to terminating

cover

24 and 25 rotations with it.Therefore, always there is rectangular relative positioning in the length that is mutually related in (on the one hand)

obturator

33 and 34 fluid conduit systems 17 that extend in connecting element 54 of neutralization (on the other hand) and 18 with it between partly.Avoid also being convenient to being screwed into of hollow screw 37a and back-outing in this mechanism of out of position rotation.

Though under the situation of work example, two

termination walls

3 and 4 are located on the terminating

cover

24 and 25 that holds

obturator

33 and 34, obviously other design also is possible, in other design, the respective design characteristics be limited to shell 2 only one distolateral on.

In this actual example, sidewall 28 circumferentially is being welded on the pipe member 26 incessantly with air tight manner.Therefore, do not need extra sealing.At the position of welding joint 32 inner radial,

obturator

33 and 34 may show that groove 57 is so that remove the heat that is produced in the welding operation process on every side.

In order to obtain further reducing of weight, piston rod can be a hollow.In this case, male thread 12 may be a part of inserting or be screwed into the bolt-like member in the hollow piston rod.

According to principle of the present invention, also may on shell 2, produce very level and smooth outside, this very big advantage really aspect cleaning.Because (if needs) may produce shell under the situation of not carrying out metal cutting, therefore, the economic manufacturing is possible.

Except be used for attached necessary wall opening 38 in diapire, two terminating covers 24 may be identical with 25 in design.They may be produced as identical primary element, then, must cut (stamp out) to this primary element in the position of necessity.

Claims

1. fluid-operated Linear actuator, comprise shell (2), described shell (2) limits two terminal termination walls (3 and 4) and tubular peripheral wall (5) and holds can linearly moving piston (7), at least one termination wall (3 and 4) is made of the diapire (27) of terminating cover (24 and 25), the sidewall (28) of described terminating cover (24 and 25) limits length part of described perisporium (5) and itself and limits another length of described perisporium (5) pipe member (26) adjacency partly, described terminating cover (24 and 25) is around obturator (33 and 34), described obturator (33 and 34) leans against described sidewall (28) and goes up and lean against on the described diapire (27) of described terminating cover (24 and 25) in inside, described obturator with respect to described terminating cover (25) axially immovably fastening, described obturator is showed the approximal surface (35) that is used for described piston (7) in its front side, described approximal surface (35) is in the front portion that axially is positioned at described termination wall (3 and 4), it is characterized in that, described pipe member (26) is enclosed within on the described obturator (33 and 34), but axially do not leaning against on the described obturator (33 and 34), keep certain distance and have the centering effect simultaneously at radially outer, described obturator (33 and 34) is fastened on the described shell (2) in the part at the rear portion that axially is arranged in its front side.

2. Linear actuator according to claim 1 is characterized in that, described obturator (33 and 34) is attached to, and especially only is attached to, on the described terminating cover of described shell (2) (24 and 25).

3. Linear actuator according to claim 2 is characterized in that, described obturator (33 and 34) is screwed onto on the described terminating cover (24 and 25).

4. according to claim 2 or 3 described Linear actuators, it is characterized in that, described obturator (33 and 34) is attached on the described terminating cover (24 and 25) by attachment means (36), and described attachment means (36) is assembled in the described obturator (33 and 34) and leans against on the described terminating cover (24 and 25).

5. Linear actuator according to claim 4 is characterized in that, described attachment means (36) works between the described termination wall (3 and 4) of described terminating cover (4 and 25) and described obturator (33 and 34).

6. Linear actuator according to claim 5 is characterized in that, described attachment means (36) only works between the described termination wall (3 and 4) of described terminating cover (24 and 25) and described obturator (33 and 34) and do not cooperate with described sidewall (28).

7. according to each described Linear actuator in the claim 4 to 6, it is characterized in that, at least one tapped hole (42) is formed in the described obturator (33 and 34) and attachment screw (37) is screwed in the described hole, and described screw extends through the described wall of described terminating cover (24 and 25) and makes head (40) lean against on the outside of described terminating cover (24 and 25) from the outside.

8. Linear actuator according to claim 7, it is characterized in that, at least one tapped hole is extending axially in described obturator (33 and 34), and attachment screw (37) is screwed in the described tapped hole (42) and makes the head (40) of attachment screw (37) externally lean against on the described termination wall (3 and 4), and described attachment screw is used for described obturator (33 and 34) is axially being rested on described termination wall (3 and 4).

9. Linear actuator according to claim 8, it is characterized in that, described shell (2) has the longitudinal axis (6) that extends at the center with respect to described shell, described longitudinal axis (6) makes that some tapped holes (42) distribute around described longitudinal axis (6) in described filling main body (33 and 34), and the attachment screw (37) of passing described termination wall (the 3 and 4) extension of described terminating cover (24 and 25) is screwed in the described tapped hole (42) and maybe can be screwed in the described tapped hole (42).

10. according to each described Linear actuator in the claim 7 to 9, it is characterized in that, utilize described at least one attachment screw (37), simultaneously, be applicable to that the attached retainer (53) of described Linear actuator (1) externally is fixed on the described shell (2).

11. Linear actuator according to claim 10 is characterized in that, described retainer (53) is designed to attached pivotally described Linear actuator (1).

12. according to each described Linear actuator in the claim 7 to 11, it is characterized in that, be located at the piston rod (8a) on the described piston (7), the described terminating cover (24) that described piston rod (8a) extends through at least one obturator (33) and is associated with it, the opening (45) of described obturator (33) has box thread, described piston rod (8a) passes described opening (45) and extends, described attachment screw (37) is screwed in the described opening (45), around described piston rod (8a) and be the form of hollow screw (37a), described screw makes its head (40) externally lean against on the described termination wall (27) of described terminating cover (24) coaxially.

13. Linear actuator according to claim 12 is characterized in that, described hollow screw (37a) has plain bearing surfaces (46) and/or seal ring (47) and/or the ribbon toroid (48) that is used for described piston rod (8a).

14. according to each described Linear actuator in the claim 1 to 13, it is characterized in that, described obturator (33 and 34) has the fluid line (17 and 18) that passes it and extend, described fluid line is opened to the work chamber (15 and 16) that is positioned between described obturator (33 and 34) and the described piston (7) on the one hand, and described fluid line is open at the place, outside of described terminating cover (24 and 25) via port (19) at other direction.

15. Linear actuator according to claim 14, it is characterized in that, go up or therein with the mode attachment sleeve shape connecting element (54) of sealing at the wall opening (55) of described terminating cover (24 and 25), described sleeve shape connecting element (54) limits described port (19) and has bindiny mechanism (22), such as connecting thread, to connect fluid pipe-line (21).

16. Linear actuator according to claim 15 is characterized in that, described connecting element (54) engages by convolution in airtight mode and is connected with the described wall of described terminating cover (24 and 25), especially, engages by welding joint or brazing.

17., it is characterized in that described pipe member (26) joins on the described sidewall (28) of described terminating cover (24 and 25) securely according to each described Linear actuator in the claim 1 to 16.

18. Linear actuator according to claim 17 is characterized in that, described pipe member (26) is soldered on the described sidewall (28) of described terminating cover (24 and 25), especially, passes through laser bonding.

19. according to claim 17 or 18 described Linear actuators, it is characterized in that the described sidewall (28) that described pipe member (26) only joins described terminating cover (24 and 25) to is gone up and do not have direct attachment means between described obturator (33 and 34) and described pipe member (26).

20., it is characterized in that described pipe member (26) has identical wall thickness throughout with described at least one terminating cover (24 and 25) according to each described Linear actuator in the claim 1 to 19.

21., it is characterized in that described pipe member (26) is made up of stainless steel with described at least one terminating cover (24 and 25) according to each described Linear actuator in the claim 1 to 20.

22., it is characterized in that described at least one obturator (33 and 34) is made up of aluminium material or polymer material according to each described Linear actuator in the claim 1 to 21.

23. according to each described Linear actuator in the claim 1 to 22, it is characterized in that, described shell (2) is formed by two terminating covers (24 and 25) with at the pipe member (26) of centre setting, and described two terminating covers (24 and 25) are provided with obturator (33 and 34).

24. according to each described Linear actuator in the claim 1 to 23, it is characterized in that, piston rod (8a) on described piston (7), described bar especially are made up of stainless steel and are passed at least one terminating cover (24) and the described obturator (33) that is associated with it and extending.

25., it is characterized in that described shell (2) is cylindricality and particularly columniform form according to each described Linear actuator in the claim 1 to 24.

26., it is characterized in that described terminating cover (24 and 25) is system of revolving or deep draw member according to each described Linear actuator in the claim 1 to 25.