EP2307170A1 - Spanneinrichtung zum lösbaren befestigen eines teils auf einer welle - Google Patents
Spanneinrichtung zum lösbaren befestigen eines teils auf einer welleInfo
- Publication number
- EP2307170A1 EP2307170A1 EP09780838A EP09780838A EP2307170A1 EP 2307170 A1 EP2307170 A1 EP 2307170A1 EP 09780838 A EP09780838 A EP 09780838A EP 09780838 A EP09780838 A EP 09780838A EP 2307170 A1 EP2307170 A1 EP 2307170A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clamping device
- nut
- clamping
- push button
- piston
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B45/00—Means for securing grinding wheels on rotary arbors
- B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/16—Bushings; Mountings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
- F16D2001/0906—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using a hydraulic fluid to clamp or disconnect, not provided for in F16D1/091
Definitions
- Clamping device for releasably securing a part to a shaft
- the invention relates to a releasable attachment of a part, in particular a grinding wheel, provided on a shaft clamping device according to the preamble of claim 1.
- a clamping device of the type mentioned is known for example from DE 199 37 436 A1.
- This clamping device has a screwed onto a shaft clamping nut for clamping a part.
- a chamber is provided which contains a hydraulic pressure medium, for example silicone oil.
- a chamber switchable escape space for the hydraulic pressure medium is provided to take the clamping pressure of the part.
- the invention has for its object to further develop a screwed onto a shaft clamping device with hydraulic relaxation option.
- This object is achieved by a clamping device with the features of claim 1.
- This clamping device comprises a screwed onto a shaft clamping nut and an annular, to the plant on a part to be clamped, in particular a grinding wheel, provided load piston. Between the clamping nut the relative to this at least slightly axially displaceable load piston is filled with a hydraulic medium pressure chamber. The hydraulic medium can be relieved by switching the pressure chamber to an alternative space. The switching of the escape space is carried out by means of a push button, which has an annular shape and concentrically surrounds the shaft.
- the push button of the clamping device Due to the annular design of the push button forces and force changes, which act on the load piston and on the clamping nut, distributed symmetrically around the shaft in each operating state of the clamping device. This is especially true when pressing the push button, that is, in reducing the force acting on the clamped part mechanical pressure force by switching the escape space to the pressure chamber.
- the push button of the clamping device according to the invention also has a much larger actuating surface, whereby a lighter manual operation is possible or significantly larger actuation forces can be applied.
- the end facing away from the clamped part of the clamping nut is filled to a considerable extent, preferably more than 30%, by the push button.
- the push button and the clamping nut in a preferred embodiment designed as a helical spring spring is tensioned, which is arranged symmetrically to the axis of rotation of the clamping device.
- the push button acts in a preferred embodiment with an annular, concentric with the axis of rotation of the clamping device, provided for changing the volume of the escape space evasive piston together.
- the pressure surface of the bypass piston loaded in the axial direction is preferably smaller than half of the pressure surface of the load piston loaded in the same direction.
- the direction "axial" refers, unless otherwise stated, to the axis of symmetry of the clamping device, that is, to the longitudinal direction of the shaft.
- the push button has on the side facing away from the load piston preferably an annular circumferential groove, in which engages a cylinder jacket-shaped portion of the clamping nut.
- a clearance can be produced by actuating the push-button, in which locking body, in particular balls, can be arranged.
- locking body in particular balls
- a stop by the cylinder jacket-shaped section is preferably provided for the blocking bodies arranged in the free space.
- the lock bodies which can be arranged in different, mutually concentric annular spaces take, according to a first embodiment, at least 180 °, in particular at least 270 °, of the respective annular space.
- the blocking body are arranged approximately vollkugelig in the annular space.
- individual locking bodies are spaced from each other in the annular space, with portions of the push button serve the defined positioning of the locking body.
- the push button is in this embodiment preferably directly, that is not on additional parts, against the component which forms the cylinder jacket-shaped portion of the clamping nut, secured against rotation.
- the anti-rotation device can be realized in a simple manner by means of securing lugs integrally formed on the cylinder-jacket-shaped section, which engage in the annular peripheral groove of the push-button.
- the push button can be produced as a chipless formed sheet metal part.
- the clamping nut according to a preferred embodiment of several metal parts composed: A directly screwed onto the shaft, called a trunk nut part of the clamping nut is preferably produced by the extrusion process.
- the hull nut is designed as a machined metal part.
- the hull nut radially surrounding part of the clamping nut is preferably a non-cutting formed sheet metal part.
- the last-mentioned sheet-metal part which can advantageously also form the abovementioned cylinder jacket-shaped section, is preferably not rigidly connected to the hull nut.
- the load piston for example by means of a partial caulking, secured against rotation, but axially movable, connected.
- the load piston in turn is secured against rotation relative to the hull nut, for example by means of hexagonal contours, and at the same time displaceable in the axial direction relative to the hull nut.
- FIG. 1 shows a first embodiment of a clamping device in a first, locked operating state
- Fig. 2 shows the tensioning device according to Fig. 1 in transition to a second, dissolved operating state
- FIG. 3 shows the tensioning device according to FIG. 1 in the second, pressed operating state
- FIG. 4 shows a second embodiment of a tensioning device in one
- FIG. 5 shows a push button of the clamping device according to Fig. 4,
- Fig. 6 is a sleeve of the tensioning device according to Fig. 4, and
- Fig. 7 is a push button of FIG. 5 and the sleeve of FIG. 6 comprehensive arrangement. Detailed description of the drawing
- a generally designated by the reference numeral 1, shown in Figures 1 to 3 clamping device is provided for releasably securing a non-illustrated part, such as a grinding wheel on a device, also not shown.
- a non-illustrated part such as a grinding wheel on a device, also not shown.
- the clamping device 1 has a clamping nut 2 and an annular load piston 3, between which a pressure chamber 4 is formed, which is filled with a hydraulic pressure medium, such as hydraulic oil.
- the hydraulic pressure medium can be located either directly between the load piston 3 and the clamping nut 2 or in an annular disk-shaped hydraulic cushion, for example made of rubber or plastic.
- annular bypass piston 5 adjoins the pressure chamber 4.
- the blocking body 6 designed as balls abuts against this.
- the balls 6 take in the arrangement of Figure 1, also referred to as a blocking position, the same radial space as the bypass piston 5 a. Neither in the axial nor in the radial direction is a mobility of the balls 6 given. All balls 6 are located within an annular space 7, which is bounded by three parts, namely the bypass piston 5, a sleeve 8 and an annular push button 9. The balls 6 fill the annular space 7 almost completely, wherein a displacement of all balls 6 radially inward must be possible, as will be explained in more detail below with reference to Figures 2 and 3.
- the load piston 3 and the bypass piston 5 are pressurized in the opposite direction.
- the effective pressure surface of the bypass piston 5 is denoted by A ⁇ , the effective pressure surface of the load piston 3 with A L.
- the printing area ratio A K / A L in the present embodiment is approx. 0.2.
- Embodiments are also feasible in which the print area ratio A K / A L is up to 0.9.
- Preferred embodiments have a print area ratio A K / A L of not more than 0.5.
- the balls 6 In the axial direction, the balls 6 in the locking position of the clamping device 1 on the one hand by the escape piston 5 and on the other hand, that is, in the direction of a load piston 3 opposite end face 10 of the clamping device 1, positioned by a disc portion 11 of the sleeve 8.
- the balls 6 In the radial direction, the balls 6 are held outwardly by a skirt portion 12 of the sleeve 8 and inwardly by an outer rim 13 of the push button 9.
- the sleeve 8 is a component of the clamping nut 2 and is manufactured as a non-cutting formed sheet metal part. Another component of the clamping nut 2 is given by a so-called trunk nut 14, which is directly screwed onto the shaft, not shown.
- the sleeve 8 is secured against rotation by a partial flange 15, but axially movable, connected to the load piston 3.
- the annular push-button 9 has at its radially inner edge a facing away from the end face 10 inner board 16 which radially surrounds a tubular, provided with an internal thread core portion 17 of the body nut 14 radially.
- the push button 9 has an annular circumferential groove 18 which is open towards the end face 10.
- this groove 18 engages a cylindrical jacket-shaped portion 19, which is integrally formed on the disc portion 11 of the sleeve 8.
- Radially outside the groove 18, the push button 9 has a conical ramp 10, tapering towards the end face 10, which abuts against the disk section 11 and merges into the outer rim 13.
- the push button 9 is thus mounted axially displaceable within a limited stroke within the clamping nut 2.
- a spring 21 acting on the pushbutton 9 with an axial force is embodied as a helical spring surrounding the core section 17 and is clamped between the pushbutton 9 and an annular disk-shaped outer section 22 of the trunk nut 14 connected in one piece with the core section 17.
- the body nut 14 and thus the entire tensioning device 1 tends to become increasingly tight due to the forces acting on the machining processes Increasing the pressure in the pressure chamber 4 means.
- the annular pushbutton 9 is pressed inwards, that is to say in the direction of the pressure chamber 4, whereby an inner annular space 23 is created in which the balls 6 dodge.
- the displacement of the balls 6 from the annular space 7 in the inner annular space 23 is significantly effected by a conical end face 24 of the bypass piston 5, wherein the taper of the end face 24 of the taper of the ramp 20 is directed opposite.
- the function of the tensioning device 1 shown completely or partially in FIGS. 4 to 7 corresponds in principle to the exemplary embodiment according to FIGS. 1 to 3.
- the same reference numerals are used in both exemplary embodiments for parts which have the same or equivalent effect.
- each cage section 27 is arranged in the circumferential direction between two balls 6 and inclined relative to the axis of rotation, so that the annular groove 18 is interrupted several times, namely at each ball 6, and has an asymmetrical V-shape in cross-section.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Jigs For Machine Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810034647 DE102008034647A1 (de) | 2008-07-25 | 2008-07-25 | Spanneinrichtung zum lösbaren Befestigen eines Teils auf einer Welle |
PCT/EP2009/059310 WO2010010069A1 (de) | 2008-07-25 | 2009-07-20 | Spanneinrichtung zum lösbaren befestigen eines teils auf einer welle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2307170A1 true EP2307170A1 (de) | 2011-04-13 |
Family
ID=41110997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09780838A Withdrawn EP2307170A1 (de) | 2008-07-25 | 2009-07-20 | Spanneinrichtung zum lösbaren befestigen eines teils auf einer welle |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2307170A1 (de) |
DE (1) | DE102008034647A1 (de) |
WO (1) | WO2010010069A1 (de) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19937436A1 (de) | 1999-08-07 | 2001-02-08 | Schaeffler Waelzlager Ohg | Spanneinrichtung zum lösbaren Befestigen eines Teils auf einer Welle |
-
2008
- 2008-07-25 DE DE200810034647 patent/DE102008034647A1/de not_active Withdrawn
-
2009
- 2009-07-20 WO PCT/EP2009/059310 patent/WO2010010069A1/de active Application Filing
- 2009-07-20 EP EP09780838A patent/EP2307170A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2010010069A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010010069A1 (de) | 2010-01-28 |
DE102008034647A1 (de) | 2010-01-28 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20110225 |
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AX | Request for extension of the european patent |
Extension state: AL BA RS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SILL, KARL-FRANZ Inventor name: BAUER, HANS Inventor name: BAUER, JOERG |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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INTG | Intention to grant announced |
Effective date: 20140923 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20150203 |
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P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230523 |