EP1152856A1

EP1152856A1 - Device for detachably connecting a tool

Info

Publication number: EP1152856A1
Application number: EP00909159A
Authority: EP
Inventors: Benno Spors; Andree Fritsch; Uwe Kretzschmann
Original assignee: Komet Praezisionswerkzeuge Robert Breuning GmbH
Current assignee: Komet Praezisionswerkzeuge Robert Breuning GmbH
Priority date: 1999-02-19
Filing date: 2000-02-12
Publication date: 2001-11-14
Also published as: JP2002537127A; AU3153900A; WO2000048776A1; US6619896B1; DE19907026A1

Abstract

The tool has a tool shank (which may be hollow) (14), whilst the machine spindle has a connecting sleeve (20) containing a recess (18) to accommodate the tool shank. A clamping mechanism (22) is located in the area between the tool shank (14) and the connecting sleeve (20). This mechanism has at least one clamping element (24''), with radial movement, which acts as a wedge drive, providing axial clamping movement between the tool shank (14) and connecting sleeve (20). The clamping mechanism comprises an actuating nut (26), which screws onto an exterior thread (28) on the connecting sleeve (20) and is coaxial in relation to the spindle axis. During the clamping procedure, the axial movement of the actuating nut can be converted into the radial movement of the clamping element (24''), with the help of at least one connecting link (30'').

Description

Device for releasably connecting a tool to a machine spindle

description

The invention relates to a device for releasably connecting a tool to a machine spindle, with a tool shaft protruding on the tool, with a connecting sleeve projecting on the spindle coaxial to the spindle axis, having a recess for receiving the tool shaft, and with one in the area between the tool shaft and Connecting sleeve engaging clamping mechanism which has at least one substantially radially movable clamping element, the radial movement of which, preferably in the manner of a wedge gear, can be converted into an axial clamping movement between the tool shank and the connecting sleeve. The connecting sleeve does not have to be arranged directly on the machine sleeve. It can also be arranged on an adapter piece which can be detachably connected to a machine spindle. On the other hand, the tool shank does not have to be arranged directly on the tool. It can be formed by an adapter piece connected to the tool.

The clamping mechanism engaging in the area between the tool shank and the connecting sleeve has the task of connecting the tool to the machine spindle in a rotationally fixed manner with the aid of the at least one radially movable clamping element. When the clamping element is actuated with the aid of a suitable actuating mechanism, its radial movement is converted into an axial clamping movement between the tool shank and the connecting sleeve. This results in a conical bracing and / or a flat surface bracing between the mutually facing clamping surfaces of the tool shank and the connecting sleeve. To actuate the clamping mechanism, pull rods are used, for example, which engage through the machine spindle and into the tool shank which are operated from the machine side. It is also known to actuate the clamping elements by means of screws or plungers which can be actuated radially from the outside. This type of actuation has the disadvantage that a predetermined orientation of the spindle is necessary in order to access the actuation screws. This disadvantage affects especially multi-spindle heads.

Proceeding from this, the object of the invention is to improve the known device of the type specified at the outset in such a way that the clamping mechanism can be actuated independently of the machine without requiring a special alignment of the spindle.

To achieve this object, the combination of features specified in claim 1 is proposed. Advantageous refinements and developments of the invention result from the dependent claims.

The solution according to the invention is based on the idea that the clamping mechanism comprises an actuating nut which is screwed onto an external thread of the connecting sleeve coaxial to the spindle axis and whose axial movement during the clamping process can be implemented in the radial movement of the clamping element with the interposition of at least one intermediate element. This measure ensures that the clamping mechanism can be actuated in the circumferential direction via the actuating nut regardless of the orientation of the spindle. The intermediate member is advantageously designed as a wedge gear. In order to achieve a flat surface tension between the tool shank and the connecting sleeve, it is advantageous if the tool shank is delimited at its root by a radially projecting annular surface against which the connecting sleeve with its free face can be pressed under the action of the clamping mechanism.

A preferred embodiment of the invention provides that the at least one clamping element is designed as a radially guided clamping bolt in a guide bore penetrating the sleeve wall of the connecting sleeve, which has a wedge surface at its end projecting outward beyond the guide bore, and that the intermediate member is on the outside the connecting sleeve between the actuating nut and the clamping bolt is non-rotatably arranged, axially displaceable intermediate ring which has a wedge surface which is in contact with the wedge surface of the clamping bolt and is complementary thereto. The wedge surface of the tensioning element and / or of the intermediate member is expediently subdivided into a feed slope that is steeper with respect to the direction of displacement of the intermediate member, and a flatter tension slope. The wedge surfaces of the intermediate ring can be delimited by two side guide surfaces facing each other in the circumferential direction, axially parallel, laterally overlapping the protruding end of the clamping bolt and thereby securing against rotation for the intermediate member, the intermediate ring expediently outside the wedge surfaces delimited by the side guide surfaces on the outer surface of the connecting sleeve is guided axially. An axial support bearing designed as a sliding or rolling bearing can be arranged in the joint area between the actuating nut and the intermediate ring. This facilitates the axial displacement of the intermediate ring by the actuating nut. Furthermore, the actuating nut can carry a ring arm that overlaps axially on the outside on the outside, which can be integrally formed on the actuating nut or connected as a separate part to it, in particular screwed, glued, soldered or shrunk on. In order to facilitate the release process, it is advantageous if the ring arm has a driver which engages behind the intermediate ring on a ring shoulder facing away from the actuating nut. The risk of pollution from the outside is reduced if a sleeve-fixed ring cover projecting radially beyond the connecting sleeve is arranged on the side of the guide bores axially opposite the actuating nut. The ring cover can be axially overlapped on its peripheral surface by the ring arm of the actuating nut. A further improvement in this regard can be achieved if a radially acting sealing ring is arranged between the ring cover and the ring arm. In order to ensure that the clamping bolt is secured against rotation in the guide bores, it is advantageous if the clamping bolt has, on its guide surface opposite the wedge surface, a radially oriented guide groove which is engaged by a guide pin which projects parallel to the axis of the ring cover.

According to a further preferred embodiment of the invention, the clamping bolt has a conical shoulder which rests against an inner cone on the tool shank side. In addition, the tool shank can have a transverse bore, in which at least one pendulum pin carrying the inner cone is slidably arranged. In order to achieve flat surface bracing, it is advantageous if the inner cone on the tool shank side and the cone shoulder on the clamping bolt side have an axial offset that acts in the clamping direction during the clamping process. According to a preferred embodiment of this embodiment variant, the clamping mechanism has two identically designed clamping bolts, which are guided radially in one of the diametrically opposite guide bores of the connecting sleeve and can be displaced by the actuating nut via the intermediate ring provided with two diametrically opposed wedge surfaces, each of which has an inwardly facing conical shoulder engage the inside cone of the pendulum pin.

Another advantageous embodiment of the invention provides that the at least one clamping element is designed as a clamping claw, which One end has an anchor part which can be supported on an inner shoulder of the connecting sleeve and at its other end a claw part which engages in a cavity of the tool shank and can be pivoted there into an inner recess, the claw part and the boundary wall of the inner recess having wedge surfaces which are complementary to one another and over which the Radial movement of the claw section can be converted into an axial clamping movement between the tool shank and the connecting sleeve. In this case, the intermediate member is designed as a non-rotatably arranged plunger inside the connecting sleeve and the tool shaft, which has a complementary wedge surface abutting against an inner wedge surface of the clamping claw and which is axially displaceable indirectly via the actuating means between a release position and a clamping position. The actuating nut is expediently coupled to the plunger via a cross bolt which passes through at least one elongated hole of the connecting sleeve which is aligned axially parallel, the cross bolt being able to reach through an elongated hole which is aligned essentially axially parallel in the clamping claw. Advantageously, at least two clamping claws of the type mentioned, which are arranged at equal angular distances from one another in the circumferential direction, are provided. Otherwise, the plunger can at the same time be designed as an ejector effective during the loosening process, which for this purpose can have an ejector head resting against an inner surface of the tool shaft.

A preferred embodiment of the invention provides that the ends of the transverse bolt are mounted in a non-rotatable thrust ring on the connecting sleeve and axially displaceably guided by the actuating nut. The thrust ring can have two diametrically opposed recesses for receiving the cross pin ends, wherein the thrust ring that crosses over the cross pin ends on the outside can be connected to the cross pin ends via a radial pin. A further advantageous embodiment of the invention provides that the actuating nut has an annular extension which extends axially over the thrust ring and which can be rigidly connected on the side of the transverse bolt axially opposite the fastening nut to a pull ring which takes the transverse bolt in the release direction. A support bearing designed as an axial sliding or rolling bearing can be arranged both between the actuating nut and the thrust ring and between the pull ring and the thrust ring.

A special solution variant of the invention provides that the thrust ring has a thread which cooperates with a thread of the actuating nut and is coaxial with the actuating nut. The thrust ring expediently has an external thread which interacts with an internal thread of the actuating nut. The thrust ring and a pull ring arranged on the side of the cross bolt axially opposite the actuating nut can be rigidly connected to one another.

It is also advantageous in this embodiment variant that the wedge surface of the ram and / or the associated wedge surface of the clamping claw has a steeper infeed slope and flatter clamping slope with respect to the direction of displacement of the ram.

A preferred embodiment of the invention provides that the clamping claws are arranged in a centering cage with axial play, which has two pistons which are connected to one another by webs and engage in a cylinder recess of the tool shank and the connecting sleeve. The webs can be designed as coolant tubes penetrating the pistons and acted upon with cooling lubricant.

The invention is explained in more detail below on the basis of the exemplary embodiments shown schematically in the drawing. Show it 1 shows a section through a tool coupling with actuating nut, an external wedge ring and clamping elements which can be displaced radially via the wedge ring;

2a and b are a plan view and a sectional view of the actuating nut;

2c shows a section through a driver ring that can be connected to the actuating nut;

3a and b are a sectional view and a top view of the wedge ring according to FIG. 1;

4a and b show a top view and a section of an annular cover of the coupling device according to FIG. 1;

5a and b show two different side views (partly in section) of one of the tensioning elements of the coupling device according to FIG. 1;

6a and b show a side view and a sectional illustration of the pendulum pin of the coupling device according to FIG. 1;

FIGS. 7a and b show a longitudinal section and a cross section through a coupling device for FIGS

Tools with internal clamping elements which can be actuated via an actuating nut and a crossbar;

7c shows the actuating mechanism according to FIG. 7a in a partially sectioned illustration; 8a to d each a clamping mechanism in a half representation corresponding to FIG. 7a with different design variants of the actuating mechanism having an actuating nut and a crossbar;

9a shows the tensioning mechanism according to FIG. 7a with a further embodiment variant of the actuating mechanism having an actuating nut and a crossbar;

9b shows a cross section through FIG. 9a;

9c, d and e three different side views of the tensioning mechanism of the coupling device according to FIG. 9a in a partially sectioned illustration.

The coupling devices shown in the drawing are intended for connecting tools 10 or tool adapters to a preferably rotating machine spindle 12 or a spindle adapter 12 '. For this purpose, the tool 10 has an axially projecting tool shank 14, while a connecting sleeve 20 projecting coaxially to the spindle axis 16 and having a recess 18 for receiving the tool shank 14 is formed on the machine spindle 12 or on the spindle adapter 12 '. To establish the connection, a clamping mechanism 22 is provided which engages in the area between the tool shaft 14 and the connecting sleeve 20 and which has at least one essentially radially movable clamping element 24 ', 24 ", the radial movement of which in the manner of a wedge gear into an axial clamping movement between the tool shaft 14 and connecting sleeve 20. The tensioning mechanism 22 comprises an actuating nut 26 which is screwed onto an external thread 28 of the connecting sleeve coaxial with the spindle axis 16 and whose axial movement during the tensioning process is at least interposed an intermediate member 30 ', 30 "in the radial movement of the at least one clamping element 24', 24" can be implemented. In all of the exemplary embodiments shown in the drawing, the intermediate member 30 ', 30 "forms a wedge gear, as will be explained in more detail below. In all exemplary embodiments, interventions 32', 32" for key actuation, in particular grooves, are formed on the outside of the actuating nut 26 32 'for a hook wrench or bores 32 "for a pin wrench. In addition, the outer circumferential surface can be provided with knurling 33 or cord for better gripping.

In the exemplary embodiments shown in the drawing, the tool shank 14 is delimited at its root by a radially projecting annular surface 34 against which the connecting sleeve 20 can be pressed with its free end face 36 under the action of the clamping mechanism 22 in the manner of a flat surface bracing.

In the exemplary embodiment of a tool coupling shown in FIGS. 1 to 7, two clamping elements 24 ″ designed as clamping bolts are provided, which are guided radially in two guide bores 38 diametrically opposite one another on the connecting sleeve 20 and penetrating the sleeve wall, and which run radially on the latter the relevant guide bore 38 projecting end have a wedge surface 40 ', 40 ". The intermediate member 30 'is designed here as an axially displaceable intermediate ring which is arranged on the outside of the connecting sleeve 20 between the actuating nut 26 and the clamping bolt 24' and which is an axially displaceable intermediate ring which bears against the wedge surface 40 ', 40 "of the clamping bolt 24' and is complementary to this wedge surface 42 ', 42 ". The wedge surfaces of the tensioning element 24 'and the intermediate link 30' are subdivided into a feed slope 40 'or 42' which is steeper with respect to the direction of displacement of the intermediate link 30 'and flatter tension slope 40 ", 42". As can be seen in particular from FIGS. 3a and b, the wedge surfaces 42 ', 42 "of the annular intermediate member 30' delimited by two side guide surfaces 46 facing each other in the circumferential direction and aligned axially parallel and laterally overlapping the radially projecting end 44 of the tensioning element 24 'and thereby securing against rotation for the intermediate member 30'. Outside the wedge surfaces 42 ′, 42 ″ delimited by the side guide surfaces 46, the annular intermediate member 30 ′ is axially guided with a cylindrical surface 48 on the outer surface of the connecting sleeve 42. As can be seen above all in FIG Actuating nut 26 and the annular intermediate member 30 'arranged a support bearing 50 formed as an axial roller bearing.

The actuating nut 26 carries a ring arm 52 axially overlapping the outside of the annular intermediate member 30 ', which has a catch 55 which engages behind the intermediate member 30' on an annular shoulder 54 facing away from the actuating nut 26 and which is connected in a rotationally fixed manner, preferably screwed, to the actuating nut 26 at point 56, is glued, soldered or molded. In order to prevent dirt from entering the guide bores 38, on the side of the guide bores 38 opposite the actuating nut 26 there is a sleeve-fixed ring cover 58 which projects radially beyond the connecting sleeve 20 and is axially overlapped on its circumferential surface by the ring arm 52 of the actuating nut 26. To further improve the sealing effect, a radially acting sealing ring 60 is arranged between the ring cover 58 and the ring arm 52.

As can be seen from FIGS. 5a and 5b in connection with FIG. 1, the bolt-shaped tensioning elements 24 'on their guide surface 62 opposite the wedge surface 40', 40 "have a radially aligned guide groove 64 into which an axially parallel via the ring cover 58 protruding guide pin 66. The bolt-shaped clamping elements 24 'also have an inner cone 68 against the tool shaft side. cone extension 70. The two inner cones 68 are arranged on a pendulum pin 72, which is arranged displaceably in a transverse bore 74 of the tool shank 14. In order to achieve the aforementioned flat surface bracing, the inner cones 68 of the pendulum pin 72 and the cone extensions 70 on the clamping element side have an axial offset acting in the clamping direction during the clamping process.

To release the tool 10 from the spindle adapter 12 ', the actuating nut 26 shown in FIG. 1 in the clamping position is loosened by rotating about the spindle axis 16 until the clamping elements 24' with their conical extensions 70 extend radially outward from the inner cones 68 of the pendulum pin 72 can be pushed. In this position, the tool shaft 14 can be pulled axially out of the recess 18 in the connecting sleeve 20. The coupling of another tool is carried out in the reverse order, in that the tool shaft 14 of the tool 10 in question is inserted into the recess 18 of the connecting sleeve 20 with the actuating nut 16 loosened, and then the actuating nut 26 is moved into FIG. 1 by moving the intermediate member 30 ' shown clamping position is brought.

In the exemplary embodiments of a tool coupling shown in FIGS. 7 to 9, the clamping elements 24 "are designed as clamping claws which have an anchor part 82 which can be supported on an inner shoulder 80 of the connecting sleeve 20 at their one axial end and one in a cavity 84 of the at the other axial end Has claw part 88 engaging tool shaft 14 and pivotable there into an inner recess 86. The claw part 88 and the boundary wall of the inner recess 86 have mutually complementary wedge surfaces 90, 92, via which the radial movement of the claw part 88 into an axial clamping movement between the tool shaft 14 and the connecting sleeve 20 In these embodiments, the intermediate member 30 "can be implemented as inside the connecting sleeve 20 and the tool shaft 14 are arranged in a non-rotatably arranged plunger which has a complementary wedge surface 96 ', 96 "bearing against an inner wedge surface 94', 94" of the clamping claw 24 "and which is axially displaceable indirectly via the actuating nut 26 between a release position and a clamping position. The actuating nut 26 is coupled to the ram-shaped intermediate member 30 "by means of a transverse bolt 102 which extends through axially parallel elongated holes 98, 100 in the boundary wall 20 and in the claw-shaped clamping elements 24". In the exemplary embodiments shown in FIGS. 7 to 9, two diametrically opposite one another claw-shaped clamping elements 24 "are provided.

In the exemplary embodiments shown in FIGS. 7 to 9, the tool shank 14 is designed as a hollow cone which can be inserted into the correspondingly conically shaped recess 18 of the connecting sleeve 20. The tool shank 14 is delimited in the region of its root by an annular surface 34 against which the end face 36 of the connecting sleeve 20 bears in the clamped state of the tool 10. In order to be able to release the non-positive connection between the tool shaft 14 and the connecting sleeve 20 when the tool is changed, the intermediate member 30 ″ designed as a plunger is at the same time designed as an ejector that is effective during the loosening process 106 on.

In the exemplary embodiments shown in FIGS. 7 to 9, the cross bolt 102 is supported with its ends 108 in a non-rotatable manner on the outer surface of the connecting sleeve 20 and is pushed axially displaceably via the actuating nut 26. 7a, 8a, 8c and 9a, the thrust ring can have two diametrically opposite recesses 112 for receiving the transverse pin ends 108. In the case of FIGS. 8b and d, the cross-bore ends 108 overlap on the outside Thrust ring 110 each connected to the transverse bore ends 108 via a radial pin 114.

7a to c, the thrust ring 110 also has an external thread 118 which interacts with a further thread 116 of the actuating nut 26 and is rigidly connected to a pull ring 120 arranged on the side of the transverse bolt 102 axially opposite the actuating nut. With these measures it is achieved that the cross bolt is carried axially via the actuating nut both in the tensioning direction and in this direction.

In the exemplary embodiments shown in FIGS. 8 a to d and 9, the actuating nut has an annular extension 122 that extends axially over the thrust ring 110. The ring extension is connected on the side of the cross bolt 102 axially opposite the actuating nut to a pull ring 120 which takes the cross bolt in the release direction. A support bearing 124 designed as a roller bearing is arranged between the actuating nut 26 and the thrust ring 110. In the case of FIGS. 8c and d there is also a support bearing 126 designed as a roller bearing between the pull ring 120 and the thrust ring 110, whereas in the case of FIGS. 8a, 8b and 9a support bearings 126 'designed as a slide bearing are arranged between the pull ring 120 and the thrust ring 110 are.

The inner wedge surfaces 94 ', 94 "of the claw-shaped clamping elements 24" on the one hand and the associated wedge surfaces 96', 96 "of the push-shaped intermediate member 30" have a steeper bevel 94 ', 96' and flatter clamping bevel 94 with respect to the direction of displacement of the intermediate member 30 " ", 96" on.

As can be seen from FIGS. 9b to e, the clamping claws 24 "can be arranged in a centering cage 128 with axial play, which centering Cage has two pistons 136, 138 connected to one another by coolant tubes 130, each engaging in a cylinder recess 132, 134 of the tool shank 14 and the connecting sleeve 20. The coolant tubes 130 penetrating the pistons can be acted upon by a cooling lubricant via a central bore 140 in the machine spindle 12. The piston 138 is sealed against the spindle-side cylinder recess 134 by a radial seal 139 (cf. FIGS. 9a, c, e).

7a, 8a to d and 9a, the coupling devices are shown in their clamping position. To release the coupling device, the actuating nut is rotated, for example, via the engagements 32 ', 32 "in the release direction, so that it moves together with the cross bolts 102 and the intermediate member 32" in the direction of the tool shank. The claw parts 88 of the claw-shaped clamping elements 24 ″ are moved radially inward via a spring ring 144 inserted into the circumferential groove 142 until their wedge surfaces 92 release the displacement path for the tool shaft 14. At the same time, the tool shaft 14 is released from the connecting sleeve 20 via the ejector head 106 The replacement of a new tool is carried out in the reverse order in that, with the actuating nut 26 loosened, the tool 10 with its tool shaft 14 is first inserted into the recess 18 of the connecting sleeve 20. If the actuating nut is then actuated in the clamping direction, the claw parts reach 88 into the inner recess 86 of the tool shank under the wedge action of the intermediate member 30 "until the wedge surfaces 90, 92 are pressed against one another with axial bracing.

In summary, the following can be stated: The invention relates to a device for releasably connecting a tool 10 to a machine spindle 12. The tool has an optionally hollow tool shaft 14, while the machine spindle has a connecting sleeve 20 with a recess 18 for receiving the tool - shaft. In the area between the tool shaft 14 and the connecting sleeve 20 there is a clamping mechanism 22 which has at least one essentially radially movable clamping element 24 ″, the radial movement of which can preferably be converted into an axial clamping movement between the tool shaft 14 and the connecting sleeve 20 in the manner of a wedge gear. The clamping mechanism According to the invention comprises an actuating nut 26 which is screwed onto an external thread 28 of the connecting sleeve 20 which is coaxial with the spindle axis and whose axial movement can be converted into the radial movement of the clamping element 24 "during the clamping process with the interposition of at least one intermediate member 30".

Claims

claims

1. Device for releasably connecting a tool (10) to a machine spindle (12), with a tool shank (14) protruding from the tool, with one on the spindle (12) coaxial to the spindle axis

(16) protruding, a recess (18) for receiving the tool shank (14) having connection sleeve (20) and with a clamping mechanism (22) engaging in the area between tool shank (14) and connection sleeve (20), which has at least one essentially have radially movable clamping element (24 ', 24 "), the radial movement of which, preferably in the manner of a wedge gear, can be converted into an axial clamping movement between the tool shank (14) and the connecting sleeve (20), characterized in that the clamping mechanism (22) is an actuating nut (26) which is screwed onto an external thread (28) of the connecting sleeve (20) coaxial with the spindle axis (16) and whose axial movement during the clamping process with the interposition of at least one intermediate element (30 ', 30 ") into the radial movement of the clamping element (24' , 24 ") can be implemented.

2. Device according to claim 1, characterized in that the intermediate member (30 ', 30 ") forms a wedge gear.

3. Apparatus according to claim 1 or 2, characterized in that the tool shank (14) is limited at its root by a radially projecting ring surface (34) against which the connecting sleeve (20) with its free end face (36) under the action of Clamping mechanism can be pressed.

4. Device according to one of claims 1 to 3, characterized in that the at least one clamping element (24 ') than in one Sleeve wall of the connecting sleeve (20) penetrating guide bore (38) radially guided clamping bolt is formed, which has a wedge surface (40 ', 40 ") projecting outward beyond the guide bore (38), and that the intermediate member (30') as On the outside of the connecting sleeve (20) between the actuating nut (26) and the clamping bolt (24 '), there is an axially displaceable intermediate ring which is non-rotatably arranged and which lies against the wedge surface (40', 40 ") of the clamping bolt (24 '), to this complementary wedge surface (42 ', 42 ").

5. The device according to claim 4, characterized in that the wedge surface (40 ', 40 ", 42', 42") of the clamping element (24 ') and / or the intermediate member (30') in a with respect to the direction of displacement of the intermediate member (30th ) steeper infeed bevel (40 ', 42') and flatter tension bevel (40 ", 42").

6. Apparatus according to claim 4 or 5, characterized in that the wedge surfaces (42 ', 42 ") of the intermediate ring (30') by two in the circumferential direction facing each other, axially parallel, the radially projecting end (44) of the clamping bolt ( 24 ') are laterally overlapping lateral guide surfaces (46) which form an anti-rotation device for the intermediate member (30').

7. The device according to claim 6, characterized in that the intermediate ring (30 ') is guided axially outside the wedge surfaces (42', 42 ") delimited by the side guide surfaces (46) on the outer surface of the connecting sleeve (20).

8. Device according to one of claims 4 to 7, characterized in that in the joint area between the actuating nut (26) and the intermediate ring (30 ') has an axial support bearing (50) designed as a sliding or rolling bearing.

9. Device according to one of claims 4 to 8, characterized in that the actuating nut (26) carries an intermediate ring (30 ') on the outside axially overlapping ring arm (52) which is either molded or attached to the actuating nut (26) .

10. The device according to claim 9, characterized in that the ring arm (52) has an intermediate ring (30 ') on an actuating nut (26) facing away from the annular shoulder (54) engaging driver (55).

11. Device according to one of claims 4 to 10, characterized in that on the actuating nut (26) axially opposite side of the guide bores (38) a sleeve cover (58) projecting radially beyond the connecting sleeve (20) is arranged.

12. The apparatus according to claim 11, characterized in that the ring cover (58) is axially overlapped on its circumferential surface by the ring arm (52) of the actuating nut (26).

13. The apparatus of claim 11 or 12, characterized in that between the ring cover (58) and ring arm (52) is a radially acting

Sealing ring (60) is arranged.

14. Device according to one of claims 11 to 13, characterized in that the clamping bolt (24 ') on its the wedge surface (40', 40 ") opposite guide surface (62) has a radially aligned Guide groove (64) into which engages a guide pin (66) projecting axially parallel over the ring cover (58).

15. Device according to one of claims 4 to 14, characterized in that the clamping bolt (24 ') has a conical shoulder (70) which bears against an inner cone (68) on the tool side.

16. The apparatus according to claim 15, characterized in that the tool shank has a transverse bore (74) in which at least one pendulum bolt (72) carrying the inner cone (68) is arranged displaceably.

17. The apparatus according to claim 16, characterized in that the tool shaft-side inner cone (68) and the clamping pin-side tapered shoulder (70) have an axial offset acting in the clamping direction in the clamping process.

18. Device according to one of claims 15 to 17, characterized in that the clamping mechanism has two identically designed, diametrically opposite guide bores (38)

Connection sleeve (20) has radially guided clamping bolts (24 ') which can be displaced by the actuating nut (26) over the intermediate ring (30') provided with two diametrically opposed wedge surfaces (42 ', 42 ") and which have an inwardly facing tapered shoulder (70 ) engage in an end-side inner cone (68) of the pendulum pin (72).

19. Device according to one of claims 1 to 3, characterized in that the at least one clamping element (24 ") is designed as a clamping claw, which at one end has an anchor part (20) which can be supported on an inner shoulder (80) of the connecting sleeve (20). 82) and at its other end one into a cavity (84) of the Tool shaft (14) engaging and there in an inner recess (86) pivotable claw portion (88), the claw portion (88) and the boundary wall of the inner recess (86) have mutually complementary wedge surfaces (90,92) over which the radial movement the claw section (88) in an axial clamping movement between

Tool shaft (14) and connecting sleeve (20) can be implemented, and that the intermediate member (30 ") is designed as a non-rotatably arranged plunger inside the connecting sleeve (20) and the tool shaft, which plunger rests against an inner wedge surface (94 ', 94") the clamping claw (24 ") has a complementary wedge surface (96 ', 96") and is axially displaceable indirectly via the actuating nut (26) between a release position and a clamping position.

20. The apparatus according to claim 19, characterized in that the actuating nut (20) is coupled via a through at least one axially parallel elongated hole (98) of the connecting sleeve (20) cross bolt (102) with the push-shaped intermediate member (30 ").

21. The apparatus according to claim 20, characterized in that the cross bolt (102) extends through an essentially axially parallel elongated hole (100) in the clamping element (24 ").

22. Device according to one of claims 19 to 21, characterized in that at least two clamping elements (24 ") arranged in the circumferential direction at equal angular intervals from one another and designed as clamping claws are provided.

23. Device according to one of claims 19 to 22, characterized in that the intermediate member (30 ") is simultaneously designed as an ejector effective in the release process.

24. The device according to claim 23, characterized in that the intermediate member (30 ") has an ejector head (106) abutting against an inner surface (104) of the tool shank (14).

25. Device according to one of claims 20 to 24, characterized in that the transverse bolt (102) with its ends (108) in a on the connecting sleeve (20) non-rotatably and via the actuating nut (26) axially displaceably guided thrust ring (110) is.

26. The apparatus according to claim 25, characterized in that the thrust ring (110) has two diametrically opposite recesses (112) for receiving the transverse pin ends (108).

27. The apparatus according to claim 25, characterized in that the thrust ring (110) on the outside overlapping the transverse pin ends (108) is connected via a radial pin (114) to the transverse pin ends (108).

28. The apparatus according to claim 25 or 26, characterized in that the actuating nut (26) has a thrust ring (110) axially overlapping ring extension (122).

29. The device according to claim 28, characterized in that the ring extension (122) on the actuating nut (26) axially opposite side of the cross pin (102) is rigidly connected to the cross pin (102) in the loosening direction pulling ring (120).

30. Device according to one of claims 25 to 29, characterized in that between the actuating nut (26) and the Thrust ring (110) a support bearing (124) designed as an axial sliding or rolling bearing is arranged.

31. The device according to claim 29 or 30, characterized in that between the pull ring (120) and the push ring (110) as an axial

Support bearing (126, 126 ') designed for sliding or rolling bearings is arranged.

32. Device according to one of claims 25 to 27, characterized in that the thrust ring (110) with a thread (116)

Actuating nut (20) cooperating thread (118) coaxial to the actuating nut (20).

33. Apparatus according to claim 32, characterized in that the thrust ring (110) has an external thread (118) cooperating with an internal thread (116) of the actuating nut (20).

34. Apparatus according to claim 32 or 33, characterized in that the thrust ring (110) and one on the actuating nut (26) axially opposite side of the transverse bolt (102) arranged pull ring (120) are rigidly connected to each other.

35. Device according to one of claims 19 to 34, characterized in that the wedge surface of the intermediate member (30 ") and / or the associated wedge surface of the tensioning element (24") a steeper with respect to the displacement direction of the intermediate member (30 ") 94 ', 96') and flatter tension bevels (94 ", 96").

36. Device according to one of claims 19 to 35, characterized in that the clamping elements (24 ") are arranged in a centering cage (128) with axial play, the two by webs (130) with each other connected pistons (136, 138) engaging in a cylinder recess (132, 134) of the tool shank (14) and the connecting sleeve (20).

37. Apparatus according to claim 36, characterized in that the webs (130) are designed as coolant tubes which can be acted upon by the pistons (136, 138) and which can be acted upon with cooling lubricant.