EP4084932A1 - Compresseur de ressort - Google Patents

Compresseur de ressort

Info

Publication number
EP4084932A1
EP4084932A1 EP21765832.7A EP21765832A EP4084932A1 EP 4084932 A1 EP4084932 A1 EP 4084932A1 EP 21765832 A EP21765832 A EP 21765832A EP 4084932 A1 EP4084932 A1 EP 4084932A1
Authority
EP
European Patent Office
Prior art keywords
contact surface
pockets
shaped contact
projections
pressure piece
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
Application number
EP21765832.7A
Other languages
German (de)
English (en)
Other versions
EP4084932B1 (fr
Inventor
Martin Stark
Thomas BRAKHAGE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hazet Werk Hermann Zerver GmbH and Co KG
Original Assignee
Hazet Werk Hermann Zerver GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hazet Werk Hermann Zerver GmbH and Co KG filed Critical Hazet Werk Hermann Zerver GmbH and Co KG
Publication of EP4084932A1 publication Critical patent/EP4084932A1/fr
Application granted granted Critical
Publication of EP4084932B1 publication Critical patent/EP4084932B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/30—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs
    • B25B27/302—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs coil springs other than torsion coil springs
    • B25B27/304—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same positioning or withdrawing springs, e.g. coil or leaf springs coil springs other than torsion coil springs by compressing coil springs

Definitions

  • the invention relates to a spring compressor according to the features of patent claim 1 .
  • EP 1 591 207 B1 discloses an internal tensioner for tensioning a helical compression spring, which has a tensioning drive with a threaded spindle and two tensioning plates that are inserted between the coils of the helical compression spring to be tensioned.
  • the clamping plates have contact surfaces adapted to the helical compression spring.
  • One of the two clamping plates has an opening on the edge so that the threaded spindle can grip the clamping plate from the side.
  • the other clamping plate has a central opening with a contact surface for a pressure piece.
  • the pressure piece has a spherical cap-shaped surface, so that a certain deflection between the pressure piece and the clamping plate is possible.
  • helical compression springs do not generally run in a straight line, but are slightly curved. As a result, the windings of the springs do not run parallel to one another either, with the result that the clamping plates are not parallel to one another at the beginning either.
  • the spherical cap shape ensures a certain balance in the area of the two clamping plates.
  • EP 1 905 545 B1 also discloses a spring tensioner for helical compression springs, with a socket in the form of a segment of a sphere for a pressure piece on the outside of a tensioning plate.
  • the clamping plate has a ring of indentations and projections.
  • Two radially projecting abutment bodies are provided on the pressure piece for engaging in the depressions.
  • the anti-twist device requires additional axial and radial space.
  • the invention is based on the object of demonstrating a spring tensioner which allows limited pivoting of the tensioning plate relative to the tensioning device arranged on the inside and at the same time allows the use of a pressure piece which is as compact as possible and has a short length.
  • the spring tensioner comprises a tensioning device that can be inserted axially into a helical spring that is to be tensioned.
  • the spring compressor includes a first and a second clamping plate.
  • the clamping plates can be coupled to the clamping device at a distance from one another.
  • the tightening device has a drive end with the second tightening plate disposed adjacent the drive end.
  • the second clamping plate has an opening for receiving the clamping device.
  • the clamping device also has a pressure piece which can be displaced along the clamping device under the action of an actuator in order to adjust the distance between the clamping plates.
  • the pressure piece presses axially onto the second clamping plate.
  • the power is transmitted via a dome-shaped contact surface between the pressure piece and the clamping plate.
  • the anti-twist device has projections and pockets for receiving the projections.
  • the projections and the pockets are located in the dome-shaped contact surface itself and interrupt it in the circumferential direction, so that the dome-shaped contact surface is composed of a plurality of dome-shaped contact surface regions which are separate from one another.
  • the dome-shaped contact surface areas are larger overall in the circumferential direction than the circumferential area in which the projections and the pockets are arranged.
  • the axial length of the pressure piece can be reduced. Only a very limited range of lengths is needed to simultaneously perform multiple functions.
  • the first function is the power transmission from the pressure piece to the second clamping plate via the dome-shaped contact surface areas. There is no transmission of force via the pockets and projections, but only via the dome-shaped contact surface areas or via the only dome-shaped contact surface overall.
  • the second function is the anti-twist device.
  • the pockets are arranged either in the pressure piece or in the second clamping plate. Both the pockets and the projections are so large that the dome-shaped contact surface areas are completely separated from one another.
  • the axial length of the dome-shaped contact surface is used completely for the anti-twist protection, in that the projections and pockets not only adjoin the dome-colored contact surface areas in the axial direction, but also completely penetrate them in the axial direction.
  • the anti-rotation device can be dimensioned relatively small because no compressive forces are transmitted in the axial direction via the anti-rotation device.
  • the dome-shaped contact surface areas are not individual line contacts, but that the dome-shaped contact surface areas are circumferential areas that extend for several degrees within a single axial plane, so that the abutment between the pressure piece and the clamping plate is as full-surface as possible, which in turn contributes to an even power transmission and to avoiding stress peaks in the components.
  • the third function that is fulfilled in the area of the contact surfaces is the compensation function for the angular positions between the pressure piece and the clamping plate.
  • the clamping plates are preferably forged components, while the pressure piece is manufactured as a turned or milled component. Indentations distributed over the circumference can be introduced more easily than projections on the pressure piece, since this would require greater removal of material adjacent to the projections.
  • the pockets are deeper than the projections are high.
  • the protrusions reach into the pockets.
  • the corresponding information on depth and height should be understood in such a way that when the pressure piece and the second clamping plate are axially aligned, a gap remains between the surfaces of the pockets and the projections.
  • the gap between the pockets and the projections is much larger than is required for pure assembly.
  • the play resulting from the gap also exists in the axial direction of the clamping device, so that the clamping plate can be bent to a limited extent relative to the pressure piece by moving along the dome-shaped contact surface without contact between the projections and pockets. Angling is only possible to a limited extent.
  • the opening in the second backing plate has a diameter that increases as the distance from the dome-shaped contact surface increases. In particular, the diameter is conically widened, for example with an opening angle of 10°-15°. This means that the clamping plate can be swiveled by 5°-7.5° in any direction. So that there is no contact between a spindle of the clamping device and the clamping plate when the clamping plate is pivoted, the pressure piece can have a shaft which penetrates the opening along its entire length. The shank encloses the spindle of the clamping device. The size and shape of a gap between the shank and the opening determines how far the chuck can be angled.
  • the first clamping plate at the other end of the clamping device can also be coupled to the clamping device so that it can pivot axially with respect to the latter.
  • An abutment with a spherical segment-shaped contact surface can be arranged on the spindle, or spherical segment-shaped contact surface areas can be formed, combined with an anti-twist device to prevent the clamping plate from twisting relative to the spindle.
  • each spherical cap-shaped contact surface having a different center point in the sense of different bowl-shaped depressions.
  • the spherical cap-shaped contact surfaces preferably extend over an angular range of at least 15° in each case.
  • the angular range refers to the circumferential direction around the longitudinal axis of the clamping device.
  • the individual contact surface areas preferably extend over 20°-40° in the case of 6 contact surface areas.
  • the number of contact surface areas or pockets and depressions is preferably between 2 and 12, in particular between 4 and 12, with 6 pockets being particularly preferred.
  • the spherical cap-shaped contact areas between the projections do not necessarily have to be identical in size to the spherical cap-shaped contact surfaces between the pockets.
  • the spherical cap-shaped contact surface areas between the projections are larger than the spherical cap-shaped contact surface areas between the pockets.
  • the pockets are slightly wider than the projections, which is at the expense of the spherical cap-shaped contact surface areas. In total, however, the Contact surface areas larger than the non-contact surface areas occupied by the pockets and projections.
  • the spherical segment-shaped contact surface areas can be of the same length in the axial direction or to extend over an angular area of the same size in the axial direction of the tensioning device or the pressure body.
  • the contact surface area on the clamping plate can have a shorter axial length than the contact surface area on the pressure body.
  • the pressure body acts as the inner part (ball) and the clamping plate as the outer part (spherical shell).
  • the clamping plate slides on the inner pressure body, so that the inner pressure body is in contact with the clamping plate in different axial sections, depending on the angular position.
  • the pressure body as a smaller component and as a rotating component is easier to process in terms of surfaces. Larger spherical cap-shaped contact surface areas can be produced more easily here.
  • the spring tensioner according to the invention has a multifunctional area on the pressure piece, as a result of which the pressure piece can be designed to be significantly shorter, more compact and also simpler. It is also cheaper to manufacture and fulfills the same functions as more complex designs that have separate functional areas.
  • Figure 1 shows a spring compressor according to the invention in the installed position
  • FIG. 2 shows a longitudinal section along the line II-II of FIG. 1;
  • FIG. 3 shows detail III of FIG. 2
  • FIG. 4 shows a pressure piece of the spring tensioner in a side view
  • Figure 5 is a section along line V-V of Figure 4.
  • FIG. 6 shows the pressure piece of FIG. 4 in a perspective view
  • FIG. 7 shows the thrust piece of FIG. 4 in an axial view
  • FIG. 8 shows the second tensioning plate of the spring tensioner in a side view
  • FIG. 9 shows the clamping plate of FIG. 8 in a perspective view of its outside
  • FIG. 10 shows the clamping plate of FIG. 8 in an axial view of its outside
  • FIG. 11 shows a section along the line XI-XI of FIG. 10 and an enlarged representation of the partial area A;
  • FIG. 12 shows a view of the contact surface of the clamping plate of FIG. 8 in the axial direction
  • FIG. 13 shows a side view of the spring tensioner with the second tensioning plate, partly in section with axial alignment
  • FIG. 14 shows the spring tensioner according to FIG. 13 in the angled position of the second tensioning plate relative to the tensioning device.
  • FIGS. 1 and 2 show a spring tensioner 1 which is inserted into a helical compression spring 2 in a side view and in a longitudinal section.
  • the spring tensioner 1 comprises a tensioning device 3 and a first and second tensioning plate 4, 5.
  • the first tensioning plate 4 has an opening 6 open on the peripheral side for the engagement of the tensioning device 3.
  • the lower tensioning plate 5 has a central opening 7, into which the tensioning device 3 is used.
  • the clamping plates 4, 5 each have mutually facing contact surfaces 8, 9 for the coils of the helical compression spring 2. On the contact surfaces 8, 9 opposite outer surfaces of the clamping plates 4, 5, the clamping device 3 has devices to exert pressure on the clamping plates 4, 5, to tension the helical compression spring 2.
  • a pressure piece 10 is used for this purpose, which is shown in FIG. 3 in an enlarged view in cross section.
  • the pressure piece 10 can be displaced in the longitudinal direction on a threaded spindle 11 of the clamping device 3 .
  • a clamping nut 12 as an actuator is in engagement with the threaded spindle 11 .
  • the pressure piece 10 is supported on the clamping nut 12 via an axial bearing 13 on the clamping nut 12 .
  • the pressure piece 10 is displaced axially.
  • the pressure piece 10 does not rotate. It is guided via a link guide 14.
  • a sliding block 16 which is arranged in a groove 15 of the threaded spindle 11 running in the longitudinal direction of the threaded spindle 11 , is in engagement with a shank 17 of the pressure piece 10 .
  • FIG. 4 to 7 show the pressure piece 10 in different representations and Figures 8 to 12 the second clamping plates 5.
  • the pressure piece 10 is used to transmit a compressive force to the second clamping plate 5.
  • the compressive force is transmitted via a spherical cap-shaped contact surface 19, the geometric position of which is shown in Figure 11 is shown.
  • FIG. 11 shows a section through the second clamping plate 5 along the line XI-XI in FIG. 10.
  • FIG. 11 shows the sectional plane on the left in the image plane and the detail A in the image plane on the right in an enlarged representation.
  • the spherical cap-shaped contact surface 19 in the area of the second clamping plate 5 borders on the opening 7 that widens in a funnel shape.
  • FIGS. 9 to 11 It can also be seen from FIGS. 9 to 11 that the contact surface 19 is completely interrupted several times. There are a total of six projections 20 distributed evenly over the circumference in the contact surface 19, which rise radially inwards beyond the spherical segment-shaped contact surface 19. As a result, the contact surface 19 is divided into individual contact surface regions 21 of the same size.
  • FIG. 10 shows the size ratio of the contact surface areas 21 to the projections 20. The projections 20 are significantly narrower or extend over a smaller peripheral area than the contact surface areas 21. FIG. Overall, therefore, the remaining contact area
  • FIGS. 4 to 7 show the pressure piece 10 with said pockets 22.
  • the pressure piece 10 also has a spherical cap-shaped contact surface 23 which corresponds to the contact surface 21 of FIG.
  • the circle 25 drawn in Figure 11 defines the position of the spherical cap-shaped contact surface 19. With an exact axial alignment of the pressure piece 10 and the second clamping plate 5, the center point 26 of the circle 25 drawn in Figure 11 is also in the center of the contact surface 23 of a pressure piece 10 arranged there The circle 25 is of course only the cross-section through the spherical cap-shaped surface.
  • FIG. 4 shows that the contact surface 23 is divided by the pockets 22 into contact surface regions 24 arranged separately from one another.
  • the contact surface areas 24 in the pressure piece 10 are somewhat shorter when viewed in the circumferential direction (FIG. 7).
  • the contact surface areas 24 are slightly longer in the axial direction of the pressure piece 10 than the contact surface areas 21 of the clamping plate 5.
  • the contact surface areas 24 border on the shank 17, which has a reduced diameter.
  • An opening 27 for receiving the sliding block 16 is arranged in the shank 17. It is a radial hole.
  • the contact surface areas 24 and the pockets 22 are located on or in a circumferential collar in the transition to an essentially cylindrical base body 28 that is larger than the shaft 17.
  • the compressive force is transmitted from the clamping nut 12 to the contact surface areas 24 via the base body 28.
  • the base body 28 accommodates a shank section of the clamping nut 12 (FIG. 3). As a result, the pressure body 10 is guided.
  • FIG. 7 shows, in an axial view from the direction of the shank 17 with the narrower diameter, that the pockets 22 occupy approximately half of the entire peripheral area, while the remaining peripheral area is accounted for by the contact surface areas 24 .
  • the pockets 22 are wider than the projections 19 so that the lower clamping plate 5 can be displaced relative to the pressure piece 10 without stresses being built up in the axial direction in the area of the pockets 22 or in the area of the projections 20 as a result of mutual contact.
  • FIG. 3 shows the mutual engagement of projections 20 in the pockets 22. It can be seen that with the axial orientation shown, no contact occurs between the projections 20 and the pockets 22.
  • the contact surface areas of both components are located outside of the sectional plane of FIGS. 2 and 3, although they touch there.
  • the pockets 22 not only have sufficient depth, but also have sufficient length. If, for example, the clamping plate 5 were pivoted clockwise to the right in the image plane of Figure 3, the projection 20 on the left in the image plane would be able to move freely upwards within the pocket 22, while in the same way the projection 20 on the right in the image plane would move within the another bag 22 is shifted down. The movement comes to an end when the conical inner wall 29 of the opening 7 on the outside 30 of the shaft 17 comes to rest.
  • FIGS. 13 and 14 show another sectional plane through said spring tensioner 1.
  • the spring tensioner 1 and the second tensioning plate 5 are aligned exactly axially in FIG.
  • the contact surfaces 19, 23 of the second clamping plate 5 and the pressure piece 10 are in contact with one another.
  • the projections and grooves are not visible in this sectional plane.
  • FIG. 14 shows a situation in which the longitudinal axis LA1 of the clamping device 3 deviates by an angle of 5° in relation to the longitudinal axis LA2 of the opening 7 in the second clamping plate 5.
  • the shank 17 is shifted to the left in the plane of the drawing and abuts and abuts the inner wall 29 of the opening 7 on the left-hand side in the plane of the drawing Gap 31 in opening 7 becomes asymmetrical.
  • the end of the pan movement has been reached. In this position there is no contact between the pockets and the projections.
  • the pressure piece 10 acts to transmit pressure and to compensate for angles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un compresseur de ressort doté d'un dispositif de compression (3), qui peut être inséré axialement dans un ressort hélicoïdal (2) à comprimer, et ayant des première et seconde plaques de compression (4, 5), qui peuvent être accouplées au dispositif de compression (3) à une certaine distance l'une de l'autre, la seconde plaque de compression (5) présentant une ouverture (7) destinée à recevoir le dispositif de compression (3), un élément de pression (10) pouvant être déplacé le long du dispositif de compression (3) sous l'effet d'un actionneur pour régler la distance entre les plaques de compression (4, 5), une surface de contact en forme de calotte (19) pour la transmission de force et un moyen anti-rotation étant formés entre l'élément de pression (10) et la seconde plaque de compression (5) afin d'empêcher une rotation de l'élément de pression (10) par rapport à la plaque de compression (5), le moyen anti-rotation ayant des saillies et des logements destinés aux saillies (20). Les saillies et logements coupent la surface de contact en forme de calotte dans la direction circonférentielle et la divisent en régions de surface de contact qui sont séparées les unes des autres, les régions de surface de contact en forme de calotte étant au total plus grandes dans la direction circonférentielle que la région circonférentielle dans laquelle sont agencés les saillies et les logements.
EP21765832.7A 2020-10-21 2021-08-12 Compresseur de ressort Active EP4084932B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202020106011.2U DE202020106011U1 (de) 2020-10-21 2020-10-21 Federspanner
PCT/DE2021/100689 WO2022083815A1 (fr) 2020-10-21 2021-08-12 Compresseur de ressort

Publications (2)

Publication Number Publication Date
EP4084932A1 true EP4084932A1 (fr) 2022-11-09
EP4084932B1 EP4084932B1 (fr) 2024-01-31

Family

ID=73460302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21765832.7A Active EP4084932B1 (fr) 2020-10-21 2021-08-12 Compresseur de ressort

Country Status (5)

Country Link
EP (1) EP4084932B1 (fr)
CN (1) CN115135453B (fr)
DE (1) DE202020106011U1 (fr)
ES (1) ES2978943T3 (fr)
WO (1) WO2022083815A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202021104272U1 (de) 2021-08-09 2021-08-17 GEDORE Holding GmbH Federspanner
DE102021120678A1 (de) 2021-08-09 2023-02-09 GEDORE Holding GmbH Federspanner

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733723A1 (de) * 1986-10-10 1988-04-21 Kleinbongartz & Kaiser Werkzeu Federnspanner
DE20101841U1 (de) * 2001-02-03 2001-05-31 Hazet-Werk Hermann Zerver GmbH & Co. KG, 42857 Remscheid Spannvorrichtung für Schraubenfedern
DE10361597B3 (de) * 2003-12-24 2005-06-30 Klann-Spezial-Werkzeugbau-Gmbh System zum Spannen einer Schraubenfeder
DE202004006807U1 (de) * 2004-04-28 2004-07-15 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Innenspanner zum Spannen einer Schraubendruckfeder
DE102006017287B4 (de) * 2006-04-12 2021-03-25 Litens Automotive Gmbh Spanner für einen Endlostrieb
DE202006014999U1 (de) * 2006-09-28 2006-11-23 Hazet-Werk Hermann Zerver Gmbh & Co. Kg Federspanner für Schraubenfedern
DE202021104272U1 (de) * 2021-08-09 2021-08-17 GEDORE Holding GmbH Federspanner

Also Published As

Publication number Publication date
ES2978943T3 (es) 2024-09-23
EP4084932B1 (fr) 2024-01-31
CN115135453A (zh) 2022-09-30
DE202020106011U1 (de) 2020-10-30
WO2022083815A1 (fr) 2022-04-28
CN115135453B (zh) 2023-08-04

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