EP3164610A1 - Kolben und damit ausgestattete stellvorrichtung - Google Patents
Kolben und damit ausgestattete stellvorrichtungInfo
- Publication number
- EP3164610A1 EP3164610A1 EP14796715.2A EP14796715A EP3164610A1 EP 3164610 A1 EP3164610 A1 EP 3164610A1 EP 14796715 A EP14796715 A EP 14796715A EP 3164610 A1 EP3164610 A1 EP 3164610A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- clamping
- receiving groove
- groove
- magnetic tape
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 71
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000033001 locomotion Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
Definitions
- the invention relates to a piston for a fluid operated actuator, in particular for a fluidbetätigten linear actuator, having a one-piece piston body having in the region of its radial outer circumference coaxial to the longitudinal axis of the piston annular receiving groove with two mutually facing side groove flanks, in a used for position detection usable permanent magnet assembly is added.
- the invention further relates to a fluid operable adjusting device, which is in particular a fluid-operated linear drive and which is provided with a housing in which a piston is arranged linearly displaceable.
- a equipped with a piston of the aforementioned type actuator is known from DE 20 2005 005 508 Ul and is designed for example as a linear drive or shock absorber.
- the piston moves relative to a housing of the actuator, wherein the integrated into the piston permanent magnet assembly is available to allow by cooperating with external position detection means, a position detection of the piston.
- the piston In order to produce the piston inexpensively, it contains a one-piece piston body with a peripheral receiving groove into which the permanent magnet assembly is inserted.
- the latter consists of several curved shaped magnet segments, which are used during assembly of the piston from radially outward into the receiving groove.
- the production and assembly of the magnet segments is relatively expensive.
- the piston described in the aforementioned DE 20 2005 005 508 U1 is additionally equipped with a guide band having a ring structure, which is inserted into an annular retaining recess formed on the outer circumference of the piston body.
- the guide band is formed as a hollow cylindrical guide ring, which is interrupted at one point of its circumference, so that it can be temporarily expanded due to its elasticity during assembly.
- the radially outer surface of the guide band defines a guide surface which slidably engages the inner peripheral surface of the housing housing the piston so that the piston can perform a precisely guided linear movement relative to the housing.
- a piston for a working cylinder which is equipped for position detection with an annular permanent magnet.
- a multi-part construction of the piston body is provided.
- the piston body consists of two mutually attached to form the receiving groove piston elements which are coated in the region of the receiving groove with an elastomeric material to clamp the permanent magnet and to fix it in a gentle manner.
- EP 0 307 569 A2 describes a piston-cylinder assembly whose piston has a one-piece piston body on which a peripheral guide band interrupted at one point of its circumference is placed peripherally.
- the guide band has elastic properties and is in one on the outer circumference the piston body formed annular groove spring-like snapped.
- the piston body has at one point of its outer circumference via a recess in which a permanent magnet piece is inserted, which is covered by the guide band.
- the invention has for its object to provide measures that allow a cost-effective equipment of a piston with a usable for position detection permanent magnet assembly.
- the permanent magnet assembly consists of a bent into a ring structure elastic permanent magnetic magnetic tape having two in the circumferential direction of the receiving groove facing each other Bandendabitese and whose width is less than the distance between the two groove flanks of the receiving groove, wherein each of the two Bandendabitese is held by clamping in one of two adjacent to each other in the circumferential direction of the receiving groove clamping zones of the receiving groove, in which the piston body in each case at least one local narrowing of the receiving groove with respect to one of the groove flanks above and on the Side surface of the magnetic tape and Wegenden clamping projection has.
- the invention is further achieved in an operable with fluid actuator of the type mentioned in that it is equipped with a trained in the aforementioned sense piston.
- the permanent magnet arrangement used is an elastically bendable magnetic tape having permanent-magnetic properties, which is placed around the piston body for mounting on the piston body and thereby inserted into the receiving groove.
- the magnetic tape is positioned so that its two mutually facing Bandendabterrorisme come to rest in a clamping region of the piston body, in which the receiving groove has two adjacent clamping zones in the circumferential direction of the receiving groove.
- Each of the two band end sections is placed in one of the two clamping zones.
- Each clamping zone is characterized in that at least one of the two groove flanks of the receiving groove is provided with a clamping projection which projects beyond the associated groove flank.
- the width of the receiving groove in the region of each clamping projection is less than the clear distance between the two mutually facing groove flanks, which is greater than the width of the magnetic tape. Consequently, the magnetic tape can be easily inserted into the receiving groove by lying around or bending around the piston body in the areas outside of the clamping area, while the two Bandendabitese are pushed into the receiving groove with slight pressure during insertion into the respective associated clamping zone.
- the magnetic tape is applied laterally and clamped in the receiving groove. If the magnetic tape is fixed in this way in the receiving groove, the band end sections can no longer be unfolded, so that the piston can then be easily inserted into the housing of an associated adjusting device.
- the piston body is equipped with a plurality of clamping projections acting on the respectively assigned band end section.
- Clamping projections has. Per clamping zone so several, in the circumferential direction of the receiving groove spaced from each other arranged clamping projections are present. Particularly advantageous is an embodiment is considered in which in each clamping zone at least two and in particular exactly two in the circumferential direction of the receiving groove at a distance adjacent to each other arranged KlemmvorSprünge are provided, which are assigned to different groove flanks. Thus, if a first clamping projection is arranged on the one groove flank, the clamping projection spaced in the circumferential direction of the receiving groove in this respect is located on the opposite groove flank. It is very advantageous if none of these KlemmvorSprünge one opposite to the other groove edge associated clamping projection.
- the projected clear distance, measured in the longitudinal direction of the piston, between the two projections which are spaced apart in the circumferential direction of the receiving groove is smaller than the width of the magnetic tape.
- the band end section can be relatively easily threaded or pushed into the receiving groove from radially outward.
- the clear distance between each clamping projection and the opposite groove flank of the receiving groove is equal to or greater than the width of the magnetic tape.
- each clamping zone the distance measured in the circumferential direction of the receiving groove between the clamping projections arranged on different groove flanks is at least as great as the width of the magnetic tape, but at most twice the width of the magnetic tape. In this way one obtains a particularly reliable clamping effect.
- the clamping projections can be designed arbitrarily and can be structured, for example, knob-shaped. It is considered particularly expedient if the clamping projections are each formed rib-shaped with an elongated shape and each extending starting from the region of the groove base in the direction of the radial groove opening of the receiving groove.
- clamping projections are chamfered at their end facing the radial groove opening end to the associated groove flank. In this way, the clamped Bandendabites can very comfortably push into the receiving groove.
- the magnetic strip is preferably a strand body bent to the desired ring shape, the two strip end sections of which either rest loosely against one another or are arranged at a small distance from one another.
- the magnetic tape consists of a strand-shaped band body of an elastically deformable Kunststoffmateri- al, which is provided with permanent magnet means.
- the permanent magnet means are preferably ferromagnetic particles which are integrated in the band body and magnetized as required.
- the one-piece piston body is preferably made of a rigid material. This then applies correspondingly for the one-piece component of the piston body performing clamping projections.
- the piston body is made of metal, ceramic, glass or a hard plastic material.
- the piston body not only has a single clamping area provided with two adjacent clamping zones, but has two such clamping areas which are assigned to diametrically opposite circumferential areas of the piston body. In this way, there is a greater variability in the insertion of the magnetic tape in the receiving groove.
- the piston is equipped with a guide strip suitable for the linear guidance of the piston in a housing of an actuating device.
- the guide band is like the magnetic tape arranged coaxially to the piston body.
- the guide strip is expediently located in an annular holding recess formed in the piston body, which concentrically surrounds the annular receiving groove and which has a greater axial width than the receiving groove.
- the receiving groove opens with its radially outer groove opening in the recess bottom of the holding recess.
- a mounted in the retaining recess, annular structured guide tape encloses the magnetic tape radially outside and covers the magnetic tape expediently.
- the guide band is particularly easy to install on the piston body when it is inserted into a longitudinal axis of the piston koaxi ale annular retaining recess and is positively held in the radial direction with respect to the longitudinal axis of the piston direction in the retaining recess.
- the guide band has a ring structure in the assembled state, but overall is a finite, over two opposite Bandendab songse disposal strand body, which can be put around the piston body for mounting in the retaining recess simply.
- the two mutually facing recess flanks of the holding recess each have an undercut profiling, wherein they each have a radial retaining projection projecting in the direction of the opposing recess flank in the direction of the recess recess at a radial distance from the recess recess.
- the two holding projections are able to engage in a form-fitting manner with the facing side edge of the guide strip pressed into the holding recess and thereby hold the guide strip in a form-fitting manner in the radial direction of the piston.
- the guide band has elastically deformable properties, so that the holding projections can press under local deformation de guide band and to form a positive engagement in the respective associated side edge of the guide band.
- the guide band expediently has a rechtecki gene cross-section.
- FIG. 1 shows a longitudinal section through a preferred embodiment of the adjusting device according to the invention, which is equipped with a likewise advantageous embodiment of the piston according to the invention
- FIG. 3 shows a cross section through the piston according to section line III-III of Figure 1, wherein the remaining components of the adjusting device are not shown and wherein both the guide tape and the magnetic tape are indicated only by dashed lines,
- Figure 4 is a side view of the piston with a view in the radial direction according to arrow IV of Figure 2, wherein the dash-dotted framed neckline is also shown enlarged and enlarged and the guide band is not shown for clarity, and
- Figure 5 in a representation corresponding to Figure 4 representation, a further radial view of the piston with Viewing direction according to arrow IV, wherein here the guide band is shown in the assembled state.
- FIG. 1 shows a longitudinal section through an actuating device 1 that can be operated with fluid in an embodiment as a fluid-operated linear drive 1a.
- actuating device 1 that can be operated with fluid in an embodiment as a fluid-operated linear drive 1a.
- the scope of the invention is not limited to linear actuators, but also extends to all other types of usable in connection with fluid applications actuators, such as for use in Stoßdäm far away.
- the adjusting device 1 has a housing 2 which defines a housing chamber 3 extending in a linear manner and preferably having a circular cross-section, in which a piston 4 is arranged to be linearly displaceable back and forth.
- the longitudinal axis 5 of the piston 4 extends in the direction of movement of the piston 4 and preferably coincides with the longitudinal axis 6 of the housing chamber 3.
- the housing chamber 3 is closed at both end sides by a respective end wall 7a, 7b of the housing 2.
- the peripheral, radially outer boundary of the housing chamber 3 takes over a one-piece or multi-part tubular body 8 extending between the two end walls 7a, 7b, the inner surface of which defines a cylindrical piston running surface 9.
- the end walls 7a, 7b are expediently designed as a housing cover which is separate relative to the tubular body 8 and connected to the tubular body 8 by fastening means. However, it is also possible to form at least one of the end walls 7a, 7b in one piece with the tubular body 8.
- the radial outer contour of the piston 4 is adapted to the inner contour of the housing chamber 3, so that it slides along the piston running surface 9 during its linear movement.
- the piston 4 is provided at its radially outer circumference with a preferably cylindrical guide surface 10 which slidably rests against the piston running surface 9, so that the piston 4 undergoes a linear guide with respect to the housing 2 during its linear movement by the interaction between the guide surface 10 and the piston running surface 9 ,
- the housing chamber 3 is axially divided into two working spaces 12a, 12b, in each of which a lying outside the sectional plane of Figure 1 fluid channel opens, so that a controlled fluid admission of the two working spaces 12a, 12b is possible.
- the piston 4 can be driven to a linear movement relative to the housing 2 in the axial direction of the longitudinal axis 6.
- the fluid used for the operation of the adjusting device 1 is preferably compressed air.
- the use of another gaseous medium or a hydraulic medium is possible.
- the linear movement of the piston 4 can be tapped outside of the housing 2 on a force-tapping part 14 coupled in a motion-coupled manner to the piston 4.
- the latter is in the embodiment of a piston rod 15, which passes through at least one of the end walls 7b slidable under sealing and which is fixed with its lying within the housing chamber section 3 on the piston 4.
- the piston 4 and the piston rod 5 thus form a moving unit.
- the linear drive la is a rodless linear drive, wherein the piston 4, for example, magnetically with an outside of the Housing 2 slidably mounted Kraftabgriffsteil is motion coupled.
- the piston 4 has a preferably disk-shaped piston body 16.
- the piston body 16 has a piston body radial plane 16 a that is perpendicular to the longitudinal axis 5 of the piston 4.
- About the piston body 16 of the piston 4 is fixed to the piston rod 15 in the embodiment.
- the piston body 16 is circular-disk-shaped and is penetrated by a central fastening hole 17, with which it is plugged onto the piston rod 15.
- the piston body 16 is expediently a one-piece component. It is preferably made of a rigid material and is made in the embodiment of metal, in particular die-cast aluminum. As alternative materials for the piston body 16, for example, ceramic, glass or hard plastic may be mentioned, with composite materials are also possible.
- the piston body 16 carries in the region of its outer periphery to the longitudinal axis 5 concentric sealing means 18, which rest in the built-in adjusting device 1 state of the piston 4 on the piston running surface 9 slidably. They prevent a fluid transfer between the two working spaces 12a, 12b.
- the sealing means 18 consist of two sealing rings 18a, 18b which are fixed to the piston body 16 at an axial distance from each other.
- each sealing ring 18a, 18b held in a radially outwardly open mounting groove 19a, 19b, which are formed in the piston body 16 at its radially outer periphery.
- Each attachment groove 19a, 19b is arranged coaxially with the longitudinal axis 5.
- the guide surface 10 is expediently formed by the radially outwardly oriented outer circumferential surface of a guide band 22 having a ring structure which is fixed to the piston body 16 in the region of the radial outer circumference.
- the piston body 16 has in the region of its radial outer circumference via a coaxial to the longitudinal axis 5 annular retaining recess 23 into which the guide belt 22 dips radially and in which the guide belt 22 is held.
- the piston 4 is equipped with a permanent magnet arrangement 24, which can be used to detect the position of the piston 4.
- the permanent magnet assembly 24 is fixed in place on the piston 4 and makes its linear movement with.
- position detection means responsive to the magnetic field of the permanent magnet assembly 24 can be in operation of the actuator 1, the current axial position of the permanent magnet assembly 24 supporting Determine piston 4.
- the position detection means comprise, for example, one or more sensors, for example Hall sensors, and / or they belong to a displacement measuring system.
- the permanent magnet arrangement 24 expediently has an annular structure and is arranged coaxially to the longitudinal axis 5 on the piston body 16.
- the permanent magnet arrangement 24 is received in an annular receiving groove 25 of the piston body 16 formed in the region of the radial outer circumference of the piston body 16.
- This receiving groove 25 has a radially outwardly oriented, extending around the piston body 16 around extending slot-shaped groove opening 26 which is narrower in the axial direction of the piston 4 than the retaining recess 23.
- the receiving groove 25 is surrounded by the retaining recess 23 radially outside, wherein it opens with its groove opening 26 in the recess bottom 27 of the retaining recess 23.
- the recess base 27 is the radial base of the retaining recess 23.
- the radially oriented groove opening 26 of the receiving groove 25 opens into the holding recess 23 in the axially central region.
- an annular recess base section 27a, 27b which is preferably contoured in a cylindrical manner, adjoins axially on both sides of the slot opening 26.
- the arranged in the holding recess 23 guide belt 22 covers the slot opening 26 and consequently also arranged in the receiving groove 25 permanent magnet assembly 24th
- the retaining recess 23 for the guide strip 22 has two lateral recess flanks 28a, 28b facing each other in the axial direction of the longitudinal axis 5 of the piston 4 and facing one another. Each of these depression flanks 28 adjoins the depression base 27, with each depression being illustrated by way of example. Be flank 28a, 28b merges into one of the two recess base sections 27a, 27b.
- the holding recess 23 is open at the recess bottom 27 opposite radial side, ie radially outward.
- the receiving groove 25 for the permanent magnet arrangement 24 has a groove base 32, radially outwardly facing groove base surface, which lies opposite the groove opening 26 radially outward.
- the diameter of the groove bottom 32 is smaller than the diameter of the recess bottom 27.
- the receiving groove 25 has two in the axial direction of the longitudinal axis 5 spaced apart and at the same time facing each other lateral groove flanks 33a, 33b, which are hereinafter referred to better distinction as the first groove flank 33a and second groove flank 33b.
- the two groove flanks 33a, 33b go in the embodiment radially inward into the recess bottom 27 of the retaining recess 23 via.
- the clear distance between the two groove flanks 33a, 33b is smaller than the clear distance between the two recess flanks 28a, 28b.
- the receiving groove 25 preferably has an at least substantially rectangular cross-section.
- the guide band 22 has a ring structure in the state fixed in the holding recess 23. However, the ring structure is not completely self-contained, but has an interruption 34.
- the guide band 22 is a strand body of finite length, which has two mutually opposite Bandendabête 22a, 22b.
- the guide band is made as a linear extruded body, which is then bent, during assembly on the piston body 16, to the annular shape. This is facilitated by the fact that the guide band 22 has elastically deformable properties.
- the guide band 22 When assembled, the guide band 22 is wound around the piston body 16 coaxially and inserted into the holding recess 23, with its two band end portions 22a, 22b facing each other in the circumferential direction 23a of the holding recess 23.
- the circumferential direction 23a of the holding recess 23 is the direction about the longitudinal axis 5 and is indicated in Figure 3 by a double arrow.
- the facing each other in the circumferential direction of the holding recess 23 faces of the guide belt 22 are preferably chamfered across the entire width of the guide belt 22 away.
- the mutually facing beveled end faces of the two Bandendabitese 22a, 22b are preferably parallel to each other.
- the permanent magnet assembly 24 preferably consists of an elastic permanent magnetic magnetic tape 35 bent into a ring structure.
- the magnetic tape 35 is expediently of finite length and has two mutually opposite band end portions 35a, 35b.
- the magnetic tape 35 is made as a linear strand body, which is bent to the ring structure when it is mounted in the receiving groove 25.
- the magnetic tape 35 is thus bent around in its mounting on the piston body 16 expediently with simultaneous radial insertion into the receiving groove 25 to the piston body 16.
- This type of assembly suitably corresponds to that of the guide band 22nd
- This type of assembly is facilitated by the fact that the magnetic tape 35 has elastically deformable properties.
- the strand-shaped band body of an elastically deformable plastic material which is provided with permanent magnet means, which are responsible for the permanent magnetic properties of the magnetic tape 35.
- the permanent magnet means are, for example, ferromagnetic particles which are embedded in the strand-shaped band body in fine distribution during the production of the magnetic tape and subsequently magnetized.
- the circumferential direction 25a of the receiving groove 25 is the direction about the longitudinal axis 5 around and is indicated in Figure 3 by a double arrow. Between the two Bandendabitesen 35a, 35b is an interruption 36 of the ring structure of the magnetic tape 35, which manifests itself in particular in a small gap, so that the two Bandendabchae 35a, 35b in the circumferential direction 25a of the receiving groove 25 are opposed with a small distance.
- the circumferential direction 25a of the receiving groove 25 is the direction around the longitudinal axis 5 of the piston 4 around.
- the magnetic tape 35 has two longitudinal side surfaces 39a, 39b which, in the state mounted in the receiving groove 25, respectively face one of the groove flanks 33a, 33b.
- the guide band 22 in the inserted into the retaining recess 23 due to its elastic properties has the tendency to open in the region of the two Bandendabitese 22a, 22b and from the Garvertie- Fung 23 to solve, the guide belt 22 is held together due to appropriate fixation measures solely by the piston body 16 so that it retains its ring structure in which it is fixed in the retaining recess 23 over its entire length.
- the piston body 16 is formed in the region of the receiving groove 25 so that it holds the inserted into the receiving groove 25 magnetic tape 35 so that, despite the based on its elasticity widening tendency is arranged over its full length in the receiving groove 25 and in the region of the two Bandendabête 35a, 35b does not open.
- the presently described effect is achieved in the guide band 22 in that the two recess flanks 28a, 28b of the holding recess 23 in cross-section each have an undercut profiling, so that each recess flank 28a, 28b form-fitting with the respectively facing side edge 37a, 37b of the two in the axial direction the longitudinal axis 5 oriented side edges 37a, 37b of the guide belt 22 is engaged.
- the form-fit acts in a radial direction with respect to the longitudinal axis 5, so that the guide band 22 is held in the retaining recess 23 over its entire length by the profiled recess flanks 28a, 28b. It is expediently a releasable positive engagement to allow replacement of the guide band in case of need.
- the undercut profiling of the recess flanks 28a, 28b manifests itself per recess flank 28a, 28b, in particular in a holding projection 38a, 38b projecting in the direction of the respectively opposite recess flank 28b, 28a is arranged concentrically to the longitudinal axis 5 of the piston 4 and extends continuously in the circumferential direction of the retaining recess 23.
- Each of the two holding projections 38a, 38b is arranged with a radial distance with respect to the recess base 27 of the holding recess 23 with respect to the longitudinal axis 5, so that in the region of a respective recess flank 28a lying radially between a respective holding projection 38a, 38b and the recess base 27, 28b results in an annular self-contained retaining recess 43a, 43b, in which the guide strip 22 can engage and which is also arranged concentrically to the longitudinal axis 5 of the piston 4.
- the guide belt 22 preferably has a rectangular cross-section in the initial state not yet inserted into the holding recess 23.
- the width of the guide belt 22 is slightly larger in this initial state than the measured in the axial direction of the longitudinal axis 5 clear distance between the opposing retaining projections 38a, 38b. In this way it is achieved that the holding projections 38a, 38b are pressed in the inserted into the holding recess 23 state of the guide belt 22 under local deformation of the guide belt 22 in the respective associated side edge 37a, 37b.
- the displaced by the impressing material of the guide strip 22 engages in the retaining recesses 43 a, 43 b.
- the radial force is applied to the guide belt with radial force relative to the longitudinal axis 5. acts so that it is pressed in between the two holding projections 38a, 38b and clamped therein.
- the magnetic tape 35 is advantageously a clamping principle is used, in which the magnetic tape 35 is not clamped over its entire length away by the piston body 16, but only in some areas, and in particular at its two Bandendabêten 35a, 35b.
- the clamping fixation of the two band end sections 35a, 35b takes place independently of one another.
- the two band end portions 35a, 35b are not fixed to each other, but only on the piston body 16th
- the piston body 16 has at least one point of its peripheral outer circumference via a clamping region 44, on which the piston body 16 is formed so that it can hold the two Bandendabête 35a, 35b independently clamped in the receiving groove 25.
- the piston body 16 has two clamping zones 45a, 45b which are adjacent to one another in the circumferential direction 25a of the receiving groove 25 and which are designed to positively hold one of the band end sections 35a, 35b in each case.
- the magnetic tape 35 expediently has a constant width "B" over its entire length. This width B is in the axial direction of the longitudinal axis 5 of the piston 4 and between the both side surfaces 39a, 39b measured.
- the magnetic tape 35 desirably has a rectangular cross-sectional shape.
- the width B of the magnetic tape 35 is less than the clear distance AI between the two groove flanks 33a, 33b of the receiving groove 25. Consequently, the magnetic tape 35 in those areas of the receiving groove 25, in which opposite portions of the groove flanks 33a, 33b , with a slight play afflicted in the receiving groove 25 added.
- the piston body 16 has at least one clamping projection 46a, 47a protruding with respect to one of the two groove flanks 33a, 33b in the direction of the opposite groove flank 33b, 33a; 46b, 47b, which causes a local narrowing of the receiving groove 25.
- the local constriction ensures that the magnetic tape 35 is clamped in one or more places in the region of its two band end sections 35a, 35b in the receiving groove 25 and can not open.
- the constriction areas which can also be referred to as bottlenecks, are marked by arrows at 48.
- each clamping zone 45a, 45b only a single clamping projection whose distance to the opposite groove flank is slightly smaller than the width B of the magnetic tape 35, so that the clamping essentially results from the fact that the single clamping projection in the facing side surface 39a , 39b of the magnetic tape 35 is pressed.
- each clamping zone 45a, 45b it is also possible in each clamping zone 45a, 45b to arrange a plurality of clamping projections in the circumferential direction 25a of the receiving groove 25 at a distance from each other. For example can this multiple clamping projections on only one and thereby be formed on the same groove flank 33a, 33b.
- clamping zones 45a, 45b it is also possible, in one or both clamping zones 45a, 45b, to provide two clamping projections opposite to one another in the axial direction of the longitudinal axis 5 of the piston 4 on the two groove flanks 33a, 33b, which project towards each other and a constriction 48 for clamping the associated band end section 35a, Define 35b. In this case, only one or more pairs of such opposing clamping projections may be present per clamping zone 45a, 45b.
- the piston body 16 in each of the two clamping zones 45a, 45b has a plurality of clamping projections 46a, 47a, which are spaced apart from one another in the circumferential direction 25a of the receiving groove 25; 46b, 47b, ie via a plurality of clamping projections, which are arranged offset in the circumferential direction of the receiving groove 25 to each other.
- the clamping projections 46a, 47a; 46b, 47b in the respective clamping zone 45a, 45b are not each on the same groove flank 33a, 33b, but are arranged on different groove flanks 33a, 33b.
- a first clamping projection 46a, 46b is integrally formed on the first groove flank 33a and a second clamping projection 47a, 47b spaced therefrom in the circumferential direction 25a of the receiving groove 25 on the second groove flank 33b.
- a respective clamping projection 46a, 47a; 46b, 47b opposite region of the respective other groove flank 33a, 33b is preferably no clamping projection, where the respective groove flank 33a, 33b is designed as a clip projection-less.
- each band end portion 35a, 35b pressed into a pinching zone 45a, 45b has a slight wavy line in the circumferential direction 25a of the receiving groove 25 through the respective pinching zone 45a, 45b
- each clamping projection 46a, 47a; 46b, 47b and the opposite groove flank 33a, 33b measured clear distance A2 is smaller than the width B of the magnetic tape 35.
- This clear distance A2 is suitably the same size as the width B magnetic tape 35 or even in this regard may be slightly larger.
- the clamping effect results mainly from the fact that the magnetic tape 35 is meander-like deformed in each clamping zone 45a, 45b, that in particular in the clamping projections 46a, 47a; 46b, 47b adjacent areas with the groove flanks 33a, 33b is clamped.
- the clamping effect is based here essentially on the fact that the Bandendabitese 35a, 35b in the clamping portions 45a, 45b are forced by the alternately located on different groove flanks 33a, 33b KlemmvorSprünge in a meandering or wavy or at least curved longitudinal shape and due to the elasticity of the magnetic tape 35 the Have a tendency to deform back into their linear initial shape, so that they clamp in the receiving groove 25 transversely to its circumferential direction 25a. It has proved to be advantageous if, in the respective clamping zone 45a, 45b, the projected clear distance A3, measured in the longitudinal direction of the piston 4, between the two clamping projections 46a, 47a; 46b, 47b is smaller than the width B of the magnetic tape.
- each clamping zone 45a, 45b to measure the distance A4 measured in the circumferential direction of the receiving groove between the clamping projections 46a, 47a arranged on different groove flanks 33a, 33b; 46b, 47b so that it is at least as large as the width B of the magnetic tape and at most twice the width B of the magnetic tape.
- a further clamping region 44a of the described structure at at least one location spaced apart from the clamping region 44 in the circumferential direction of the piston body 16.
- This further clamping region 44a may then alternatively to the described clamping region 44 be used for fixing the two band portions 35a, 35b, when the magnetic tape 35 is inserted with a corresponding position in the receiving groove 25.
- even more such clamping regions can be present distributed along the circumference of the piston body 16, but the number of clamping regions will be kept as low as possible because they fundamentally complicate the insertion of the magnetic tape 35 due to the achieved clamping effect.
- the clamping projections 46a, 47a; 46b, 47b can basically be designed arbitrarily. It is important that they cause a local narrowing in the course of the receiving groove 25.
- each clamping projection 46a, 47a; 46b, 47b is formed according to Figures 2 and 3 rib-shaped with elongated shape and each extending from the region of the groove bottom 32 of the receiving groove 25 in the direction of the radial groove opening 26 of the receiving groove 25.
- the clamping projections 46a, 47a; 46b, 47b have at their radial slot opening 26 facing end portion a radially outward and to the associated groove flank 33a, 33b extending chamfer 49.
- the chamfers 49 form oblique guide surfaces which guide the respective band end section 35a, 35b into the receiving groove 25 in a targeted manner when the same is subjected to a pressing force during assembly from the radially outside.
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2014/003034 WO2016074691A1 (de) | 2014-11-12 | 2014-11-12 | Kolben und damit ausgestattete stellvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3164610A1 true EP3164610A1 (de) | 2017-05-10 |
EP3164610B1 EP3164610B1 (de) | 2017-10-18 |
Family
ID=51897237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP14796715.2A Active EP3164610B1 (de) | 2014-11-12 | 2014-11-12 | Kolben und damit ausgestattete stellvorrichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3164610B1 (de) |
KR (1) | KR20170082500A (de) |
CN (1) | CN107076179B (de) |
WO (1) | WO2016074691A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017115481B4 (de) * | 2017-07-11 | 2022-09-01 | Schaeffler Technologies AG & Co. KG | Doppelmagnethalterung für einen Kolben eines CSCs mit Sensor und Nehmerzylinder mit Doppelmagnethalterung |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3639868A (en) * | 1971-03-17 | 1972-02-01 | Bimba Mfg Co | Magnetic switch mounting means for a fluid motor unit |
DE2947516C2 (de) * | 1979-11-24 | 1981-09-03 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Kolben für berührungslose Abtastung der Kolbenstellung |
DE3731158A1 (de) * | 1987-09-17 | 1989-03-30 | Festo Kg | Kolben-zylinder-aggregat |
JP4063402B2 (ja) * | 1998-05-27 | 2008-03-19 | 株式会社アミテック | シリンダ位置検出装置 |
DE202005005508U1 (de) * | 2005-04-07 | 2005-06-02 | Festo Ag & Co. | Kolben und damit ausgestattete fluidbetätigte Stellvorrichtung |
DE202005010618U1 (de) * | 2005-07-06 | 2005-09-29 | Festo Ag & Co. | Kolben für einen Arbeitszylinder |
CN201062601Y (zh) * | 2007-07-27 | 2008-05-21 | 毛信强 | 二级缓冲活塞式气缸 |
DE102011120596A1 (de) * | 2011-12-08 | 2013-06-13 | Trw Automotive Gmbh | Kolben für eine doppeltwirkende Kolben-Zylinder-Einheit und hydraulische Servolenkung mit einem solchen Kolben |
-
2014
- 2014-11-12 WO PCT/EP2014/003034 patent/WO2016074691A1/de active Application Filing
- 2014-11-12 EP EP14796715.2A patent/EP3164610B1/de active Active
- 2014-11-12 CN CN201480082353.9A patent/CN107076179B/zh not_active Expired - Fee Related
- 2014-11-12 KR KR1020177007446A patent/KR20170082500A/ko not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2016074691A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN107076179B (zh) | 2018-11-30 |
KR20170082500A (ko) | 2017-07-14 |
EP3164610B1 (de) | 2017-10-18 |
CN107076179A (zh) | 2017-08-18 |
WO2016074691A1 (de) | 2016-05-19 |
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