EP2005008A2 - Linear driving mechanism - Google Patents
Linear driving mechanismInfo
- Publication number
- EP2005008A2 EP2005008A2 EP07711640A EP07711640A EP2005008A2 EP 2005008 A2 EP2005008 A2 EP 2005008A2 EP 07711640 A EP07711640 A EP 07711640A EP 07711640 A EP07711640 A EP 07711640A EP 2005008 A2 EP2005008 A2 EP 2005008A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- linear drive
- guide
- linear
- drive device
- ball
- 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
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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/082—Characterised by the construction of the motor unit the motor being of the slotted cylinder type
Definitions
- the invention relates to a linear drive device having a linear drive, which has a drivable to a linear output drive output member which is drivingly coupled or coupled via a coupling device with a on a linear guide in a direction parallel to the direction of the output movement slidably guided guide member coupled, wherein the coupling device at least a tension and compression stiff, on the one hand with the driven part and on the other hand connected to the guide member or connectable coupling member has.
- a linear drive device of this type known from EP 0 744 554 B1
- the driven part of a fluid-actuated linear drive is drivingly coupled in terms of drive with a guide part displaceably guided on a rod guide.
- the guide part makes the linear movement of the driven part directly with.
- a coupling device is present, which has a tension and compression stiff, but at the same time resiliently flexible coupling member, which is at one end to the drive part and the other end to the guide member pivotally mounted. Because of this bearing and the bending elasticity of the coupling member, the coupling device is able to play out any possible non-parallelism in the direction of movement of the driven part and of the guide part. venezen. The manufacturing cost of the coupling device is relatively large.
- the coupling member is tension-, pressure- and bending-resistant formed in a linear drive device of the type mentioned and connected via a respective ball joint device with the output part and the guide member or connectable.
- the two ball joint devices allow each other independent relative movements of the driven part and the guide member with respect to the coupling member, while ensuring a backlash in the direction of the output motion coupling between the output part and the added
- the coupling device is suitable for compensating any misalignment and angle errors which may possibly occur between the drive part of the linear drive and a guide part connected or connectable in operation, as a rule, with a load to be moved. occur or exist. This prevents retroactive forces from causing premature wear due to over-determination. At the same time a precise positioning of the guide member and a possibly associated load can be ensured by the absolutely play-free coupling in the direction of the output movement.
- the coupling device is particularly suitable for the field of servo-pneumatics, in which the positioning accuracy plays a special role. All in all, very low production costs can be achieved by the simple construction.
- the linear drive is expediently a fluid-actuated linear drive and, in particular, a pneumatic linear drive operated with compressed air.
- the linear drive expediently has its own linear guide for the output part, which is arranged, for example, on the outside of the drive housing, wherein it may be suitable for guiding a slide-like driven output part.
- the latter is especially relevant to a design as a rodless linear drive, in which the driven part moves exclusively along the drive housing and does not extend beyond its end faces.
- the coupling device can be used for direct attachment of its coupling element on the output part and / or on the guide part. forms his.
- a facilitated handling results from a design in which the coupling device has a base element for each preferably releasable attachment to the output part and on the guide part, wherein between each base element and the coupling member one of the two ball joint devices is interposed.
- the ball joint device preferably comprises a ball receptacle arranged on the coupling element and a bearing ball rotatable therein in all directions about its ball center, fastening means for direct or indirect connection to the stripping section or the guide part being arranged on the bearing ball.
- fastening means can be designed for example as a radially projecting from the bearing ball mounting shank, in particular with a fastening thread i5.
- the coupling member has at least in the region of its ball seats and preferably overall flat shape.
- the ball seat can be formed here by an opening of the coupling member whose peripheral boundary 2o surface forms a concave bearing surface corresponding to the ball for the bearing ball.
- the bearing surface is designed in particular comparable to an equatorial spherical zone.
- the bearing ball can be very easily inserted by pressing in the associated ball seat 5.
- This favors in particular a one-piece design of the coupling member, in particular as an injection molded part.
- the fastening means arranged on the bearing balls can point to the same side or to opposite sides.
- FIG. 1 shows a preferred first design of the linear drive device according to the invention in a front view
- FIG. 3 shows the linear drive device of Figure 1 in cross section along section line III-III
- Figure 4 shows the linear drive device of Figure 1 in a performed in the coupling device
- the linear drive device designated in its entirety by reference numeral 1 contains a linear drive 2 with a driven part 5 which, during operation of the linear drive 2, can be driven to a reciprocating linear output motion 4 which is indicated by a double arrow.
- the direction of the output movement 4 is predetermined by a first linear guide 3 belonging to the linear drive 2, which is exemplarily designed as a guide rail 3 a extending in the direction of the output movement 4.
- a first linear guide 3 belonging to the linear drive 2 which is exemplarily designed as a guide rail 3 a extending in the direction of the output movement 4.
- it is arranged on the outer circumference of the longitudinal shape, designated as the drive housing 6 housing of the linear drive 2. It can be made in one piece with this drive housing 6 as shown, although a realization as a separate component would be possible.
- the drive housing 6 houses in its interior all or part of the serving for driving the driven part 5 drive means 7.
- the linear drive 2 is a fluidbetätigter and in particular s a pneumatically actuated linear drive 2, a drive piston 8, in a along the drive housing 6 extending receiving space 12 is slidably mounted. It is equipped with sealing means 13, through which it cooperates sealingly with the wall of the receiving space 12, so that he lo the receiving space 12 axially divided into two working chambers 14 a, 14 b.
- the latter are controlled by not shown in detail, the wall of the drive housing 6 passing through fluid channels acted upon by pressure medium to axially displace the drive piston 8 in one or the other direction.
- the drive piston 8 is coupled in a motion-coupled manner to the output part 5 in such a manner that the latter participates synchronously in the linear motion of the drive piston 8 while carrying out the output motion 4.
- the linear drive 2 could be a working cylinder, in which the force transmission device 15 is formed by a piston rod passing through an end-side end wall of the drive housing 6, which acts on the output part 5 outside the drive housing 6 or forms it itself.
- the invention is preferably used in a so-called columnless linear drive 2, as is apparent from the drawing by way of example.
- the drive housing 6 is longitudinally slotted at one point of the circumference of the Aufnähmeschreibs 12, wherein through the longitudinal slot 16 belonging to the power transmission device 15 driver 17 passes through-0, which connects the drive piston 8 to the output member 5 drivingly. It can be covered by a cover 18 attached to the output part 5.
- the longitudinal slot 16 is covered by a sealing band 22 resting against its slot flanks from the inside. This is lifted in the region of the drive piston 8 in the lying between the two sealing 5 mittein 13 area by not shown in detail on the inside of the longitudinal slot to allow the passage of the driver 17 through the longitudinal slot 16.
- the linear drive 2 lo could, for example, also be an electric or an electro-fluidic linear drive.
- the output member 5 may be formed in particular slide-like. Conveniently, it surrounds the guide rail 3a of the first linear guide 3 in a clamp-like manner (see FIG. 3). i5 arranged on the output member 5 bearing means 23 cause the
- the bearing means 23 may be plain bearing means and / or rolling bearing means.
- a designated generally by reference numeral 24 coupling device 24 of the liner drive device 1 allows in the direction 20 of the output movement 4 - hereinafter also referred to as "axial direction" - a play-free MitnähmeVeritati with a further, second linear guide 25 in the longitudinal direction slidably guided guide member 26th
- the movement of the guide member 26 is referred to as a guide movement 27.
- the second linear guide 25 is formed so that the direction of movement of the guide movement 27 is parallel to the direction of movement of the driven movement 4. At least this is the claim in the realization of the overall arrangement. In practice, however, at least nimal deviations in the parallelism between output movement 4 and guide movement 27 can never be completely excluded due to manufacturing and assembly tolerances. These deviations, which can be described as misalignments and misalignments, can lead to increased wear and thus to a reduction in the service life given an overall rigid coupling of output part 5 and guide part 26.
- the coupling device 24 reduces or eliminates this problem by indeed in the axial direction causes a play-free driving coupling between the output part 5 and guide member 26, but otherwise permits relative movements between said components in order to compensate for any misalignment and angle errors automatically.
- the second linear guide 25 is a rod guide in the embodiment. It contains at least one and preferably at least two guide rods 25a, 25b, which run alongside one another in a parallel position, on which the guide part is movably guided in the longitudinal direction.
- Other designs for the second linear guide 25 are also possible. For example, it could be formed by one or more guide rails.
- the second linear guide 25 as well as the associated guide member 26 may for example be part of a machine or system with which the linear drive 2 is drivingly coupled by means of the coupling device 24 to provide a driving force.
- the linear drive 2 can be installed independently of the second linear guide 25.
- a support structure 28 is indicated, on which the second linear guide 25 is fixed independently of the linear drive 2 and which is formed for example by a machine frame on which the linear drive 2 can be mounted with its drive housing 6.
- the guide member 26 preferably forms a load carrier 32, so a component with which a load to be moved, of whatever kind, is connectable. It contains for fastening the load to be moved suitable fastening means 33, for example, among other things, a plurality of threaded holes.
- suitable fastening means 33 for example, among other things, a plurality of threaded holes.
- the load carrier may also be a separate component with respect to the guide part 26, which is fastened to the guide part 26, in whatever way.
- the second linear guide 25 extends at a distance alongside next to the linear drive 2.
- Output member 5 and guide member 26 are spaced apart in the direction of a direction indicated in Figure 3 by a dash-dotted line transverse axis 34. The latter, with the mutually parallel directions of movement of output part 5 and guide part 26, biases a main plane 35 of the linear drive device 1.
- the coupling device 24 includes a zugsteif, rigid and rigid trained coupling member 36 which is connected via a respective ball joint device 37 with both the output member 5 and the guide member 26 or can be connected. About this arrangement, the driving force is transmitted from the output member 5 to the guide member 26.
- the coupling member 36 is preferably oriented such that a straight connecting line 38 connecting the two ball joint devices 37 is oriented essentially parallel to the direction of the output movement 4. An at least light one However, skew is readily possible as well. It is expedient if the included between the connecting line 38 and the axial direction of the driven movement 4 angle is an acute angle, if there is an oblique arrangement.
- Each ball joint device 37 contains a ball receptacle 42 arranged or formed on the coupling member 36 and a bearing ball 43 mounted therein, the bearing enabling the ball ball 43 to rotate with respect to the ball receptacle 42 in all directions around its ball center 44.
- the coupling member 36 can be arbitrarily rotated or pivoted about the ball center 44 in the region of each ball joint device 37.
- Each bearing ball 43 is equipped with fastening means 45 for in particular releasable connection with the associated output member 5 or guide member 26.
- This fastening means 45 expediently include a radially projecting from the associated bearing ball 43 and in particular integrally formed with the bearing ball 43 mounting shank 46.
- the coupling member 36 has a flat shape at least in the region of at least one and preferably in the region of both ball receptacles.
- As optimal overall flat design of the coupling member 36 is considered, so practically as a plate element with any outer contour.
- it is provided in the region of the two spherical receptacles 42 with circularly contoured end sections, between which a narrower web section extends.
- the coupling member 36 is oriented so that its in Fig. 3 indicated by dash-dotted lines main plane 47 extends substantially parallel to the above-defined main plane 35. Due to existing misalignment between the two linear guides 3, 25 but other orientations are possible.
- the thickness of the coupling member 36 is expediently smaller, at least in the region of the ball receptacles 32, than the diameter of the associated ball bearing 43. This consequently protrudes beyond the coupling member 36 on both sides, as shown in FIGS. 4 and 5.
- the fastening means 45 are oriented transversely to the main extension plane 47 of the coupling member 36.
- the fastening means 35 starting from the main expansion plane 47, on the same side te.
- they can also be opposite to each other.
- the type of arrangement will be oriented, in particular, to the conditions of the association between output part 5 and guide part 26.
- the ball receptacle 42 is formed in the embodiment of an opening of the coupling member 36, the peripheral-side boundary surface forms the bearing surface 48 for the rotatably received bearing ball 43 or.
- the bearing ball 43 can not fall out, the bearing surface 48 is concave, corresponding to the ball curvature.
- it has the shape of a spherical zone symmetrical to the equatorial plane in the mathematical sense.
- the bearing ball 43 does not have to have a spherical shape in its entirety.
- the spherical shape can be limited to that section which, taking into account the possible rotational and pivoting angles always within the ball seat 42 remains.
- the bearing ball 43 is flattened on the side diametrically opposite the fastening means 45.
- the coupling member 36 at least in the area of the ball seat 42, expediently consists entirely of a synthetic material which has a certain elastic deformability
- the mounting of the bearing balls 43 in its ball seats 42 is particularly simple. It suffices to simply press the ball bearings 43 through one of the two loops of the ball holders 42, so that no separate fastening means are required. This allows a particularly cost-effective production.
- the coupling member 36 can be made in one piece, especially in such a design.
- each bearing ball 43 could be fastened directly to a matching counterpart of the driven part 5 and / or the coupling member 36.
- the coupling device 24 contains per ball joint device 37 a base element 52 which serves as an interface.
- Each bearing ball 43 is fastened via its fastening means 45 to a base element 52.
- One of the base elements 52 is then on suitable further attachment means 53 on
- the further fastening means 53 may in particular be fastening screws which can be passed through the base element 52 in order subsequently to be screwed to the driven part 5 or the guide part 26
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bearings For Parts Moving Linearly (AREA)
- Transmission Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200620005952 DE202006005952U1 (en) | 2006-04-12 | 2006-04-12 | Linear drive device |
PCT/EP2007/001566 WO2007118546A2 (en) | 2006-04-12 | 2007-02-23 | Linear driving mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2005008A2 true EP2005008A2 (en) | 2008-12-24 |
EP2005008B1 EP2005008B1 (en) | 2009-08-12 |
Family
ID=36710227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07711640A Expired - Fee Related EP2005008B1 (en) | 2006-04-12 | 2007-02-23 | Linear driving mechanism |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2005008B1 (en) |
CN (1) | CN101415953A (en) |
DE (2) | DE202006005952U1 (en) |
WO (1) | WO2007118546A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2765769C1 (en) * | 2018-10-17 | 2022-02-02 | Эйрбас Дефенс Энд Спейс, С.А. | Articulated mechanism and articulated orientation system containing this mechanism |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3464406D1 (en) * | 1984-04-10 | 1987-07-30 | Reinhard Lipinski | LINEAR TRANSPORTER |
DE29508663U1 (en) * | 1995-05-24 | 1995-08-17 | Festo Kg, 73734 Esslingen | Coupling device for linear drives |
US6253657B1 (en) * | 1999-12-22 | 2001-07-03 | Trw Inc. | Steering apparatus |
-
2006
- 2006-04-12 DE DE200620005952 patent/DE202006005952U1/en not_active Expired - Lifetime
-
2007
- 2007-02-23 DE DE502007001307T patent/DE502007001307D1/en active Active
- 2007-02-23 CN CNA2007800122312A patent/CN101415953A/en active Pending
- 2007-02-23 EP EP07711640A patent/EP2005008B1/en not_active Expired - Fee Related
- 2007-02-23 WO PCT/EP2007/001566 patent/WO2007118546A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007118546A3 * |
Also Published As
Publication number | Publication date |
---|---|
CN101415953A (en) | 2009-04-22 |
DE502007001307D1 (en) | 2009-09-24 |
EP2005008B1 (en) | 2009-08-12 |
WO2007118546A2 (en) | 2007-10-25 |
DE202006005952U1 (en) | 2006-07-06 |
WO2007118546A3 (en) | 2007-12-27 |
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