Tool holder

Abstract

To provide a tool holder for driven tools with a simple structure for tools that are rarely replaced. [Solution] In a tool holder provided with a housing 2, a shaft 5, and a tool housing 6, the shaft 5 is provided with a drive connection part 9 at its rear end 5b, the drive connection part 9 is formed to be driven by a drive transmission part of a support device 4, the pressure chamber 12 is connected to a pressure generating device 14 via a pressure medium connection part 13, and the pressure chamber 12 is capable of achieving a fitted connection between the contact area 11 and the connection area 7a of the tool 7 by deformation of the contact area 11 with respect to the connection area 7a.

Description

Technical Field

[0001] The present invention relates to a tool holder according to the preamble of claim 1.

Background Art

[0002] A tool holder having a housing and a shaft rotatably supported therein enables holding a tool that rotates during machining of a workpiece. A tool holder having a guided and rotating tool is also called a driven tool, and by this name, it is distinguished from a tool that is fixedly arranged on the tool holder and merely guided by the tool holder. A driven tool can be used for tool rotation axes for axial and radial machining, and for combinations thereof.

[0003] Since a driven tool is used, for example, for complete machining, in addition to rotation, milling, drilling or other machining is also possible. A normal driven tool is a tool holder that also has a rotatably arranged milling cutter, hob cutter, thread milling cutter, gear cutter, center drill, chamfer cutter, thread tapping die, reamer or, in some cases, a round saw. Complete machining of a workpiece is possible by machining the workpiece that rotates or is fixedly held and the fixed and driven tool. A lathe having a fixed, driven and guided tool can manufacture products having various shapes based on bar-shaped materials without reclamping the workpiece.

[0004] In known driven tools, the connection between the tool holder and the tool is formed by a collet chuck, particularly an ER collet chuck. Here, the tool holder includes, at the front end of a shaft rotatably supported in a housing, a truncated or conical housing opening or collet chuck housing, and, within the housing opening or collet chuck housing, a radially notched sleeve or collet chuck having a truncated or conical shape and a central hole for housing the tool shaft. In the art, the truncated is often referred to as a cone or conical shape. To clamp the tool fitted into the central hole, the collet chuck is pressed into the collet chuck housing by a union nut that can be screwed onto the male threads of the shaft, the central hole is tightened, and the shaft of the tool is fitted into the collet chuck, and the collet chuck is fitted into the shaft.

[0005] To position and guide a fixed and driven tool, the tool machine includes a drum-shaped and / or column-type support device having a housing for the tool holder. The support device is movable relative to the workpiece to be machined together with the tool holder positioned therein. Support devices also exist in which the tool holder is positioned by a cylinder pin.

[0006] In a Swiss-type lathe, the rod-shaped material to be machined is clamped to the rotating machine spindle and guided by a guide bush. During machining of the rod-shaped material, it is positioned so that the machining by the tool takes place as close to the guide bush as possible. This ensures optimal protection of the rod-shaped material from deformation, particularly deflection, throughout the machining process. For highly complex applications, in addition to fixed tools for rotation, drivable tools with individual axes are also used to machine non-rotating rod-shaped materials or workpieces.

[0007] Swiss-type lathes are used, for example, for the manufacture of small metal components known as décortage. Such small components are manufactured, for example, for the watch or pharmaceutical industry, as well as for microtechnology and micromechanics. The guided, rotating tools used in the manufacture of these small components often have a small diameter laterally to the tool axis, and therefore the joints between the tool holder and the tool need to be small and precisely formed. The small and precise formation of the collet chuck housing, collet chuck, the male threads of the shaft, and the female threads of the union nut is extremely complex.

[0008] Patent Document 1 describes a machining center having a revolving head, the machining center having tool holders for drivable tools arranged in mounting holes. Each tool holder includes a housing, in which a shaft is rotatably supported via two spaced-apart rotary bearings. Between the two rotary bearings, a rotor is positioned on the shaft, and a stator for a drive motor is positioned in the housing.

[0009] At the front end of the shaft facing the tool, the shaft is equipped with a truncated or conical collet chuck housing. This collet chuck housing, together with a union nut, houses a collet chuck that allows the shaft portion of the tool to be fitted into the collet chuck and the collet chuck to be fitted into the shaft.

[0010] Known tool holders are complexly formed, requiring complex machining steps for their manufacture. The complex structure is designed to allow for frequent replacement of the clamped tool with minimal effort and minimal wear on the collet chuck and the tool used.

[0011] In tool machines with support devices for many driven tools, individual tools can remain in the tool holder for a very long time. If the driven tools are rarely replaced in the tool holder due to infrequent use or their high quality, the known high manufacturing cost of tool holders is not justified. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] German Patent Application Publication No. 102004044187 Specification [Overview of the Initiative] [Problems that the invention aims to solve]

[0013] The problem addressed by the present invention is to find a tool holder for a driven tool with a simple structure for tools that are rarely replaced. [Means for solving the problem]

[0014] The problem is solved by the features of claim 1. Dependent claims describe advantageous embodiments that solve another problem.

[0015] The tool holder according to the present invention comprises a positioning connector for positioning in a support device of a machining tool, and a shaft extending along the shaft axis. The tool holder includes a tool housing at the front end of the shaft for clamping the connection range of a tool. The shaft is supported in the housing by a rotational support so as to be rotatable about the shaft axis. The rotational support of the shaft includes front and rear rotational bearings, of which the front rotational bearing is located closer to the front end of the shaft than the rear rotational bearing. The shaft has a drive connector at the rear end, opposite to the front end, which is formed to be driveable by a drive transmission unit of the support device after the tool holder has been placed in the support device. The tool housing comprises a contact range into which the connection range of the tool to be clamped can be contacted, and a pressure chamber formed concentrically with respect to the shaft axis and capable of being filled with a pressure medium. The pressure chamber is connected to a pressure generating device on the shaft via a pressure medium connector. The pressure generating device is located in a range extending from the front end of the shaft to the front rotational bearing. The pressure chamber enables a mating connection between the contact area and the tool's connection area by deformation of the contact area relative to the connection area, both within the tool's connection area adjacent to the contact area and within the pressure generated in the pressure chamber by the pressure generator.

[0016] Preferably, oil or, in some cases, grease (lubricating oil) is used as the pressure medium.

[0017] The formation according to the present invention of a pressure chamber, a pressure medium connector, and a pressure generating device, which are positioned within the contact area and filled with a pressure medium, is essentially less complex than the manufacturing of the components required for a tool holder known from the prior art, namely the truncated collet chuck housing, the ER collet chuck, the union nut, and the threaded portion required for clamping. In addition to being less complex to manufacture, the solution according to the present invention has the advantage of being shorter in configuration because the pressure generating device is positioned in a range that extends from the front end of the shaft to the forward rotating bearing. In a tool holder with a collet chuck, the union nut protrudes beyond the shaft.

[0018] In one advantageous configuration, the pressure chamber comprises at least two pressure chamber ranges formed concentrically with respect to the shaft axis, and spaced relatively apart from each other in the direction of the shaft axis. The pressure chamber ranges enable a mating coupling to be achieved in at least two pressure chamber ranges by deformation of the contact range relative to the connection range, between the contact range and the tool connection range, at the pressure generated in the pressure chamber by the pressure generator. In some cases, instead of a pressure chamber having at least two pressure chamber ranges, at least two pressure chambers are provided that enable a desired deformation of the contact range.

[0019] In a preferred embodiment, the pressure generator comprises a pressure generating hole having a threaded portion on the shaft and a pressure bolt that can be screwed into the pressure generating hole. The pressure medium filled in the pressure chamber and the pressure medium connection portion allows the pressure required for a mating connection to be achieved in the pressure chamber by screwing in the pressure bolt. In configurations with more than one pressure chamber, the pressure chambers can be connected to one common pressure generator or, optionally, to one individual pressure generator each.

[0020] In order to prevent the pressure medium from leaking in the pressure bolt, a pressure generating device according to a particularly advantageous embodiment includes a sealing piston at the end of the pressure bolt facing the pressure medium connection portion in a range where the pressure generating hole does not have a threaded portion. In some cases, a pressure piston is arranged between the pressure bolt and the sealing piston.

[0021] In another preferred embodiment, the pressure chamber is connected to a sealable venting device via a venting connection formed in the shaft, and the sealable venting device is arranged in a range extending from the front end of the shaft to the front rotary bearing.

[0022] An advantageous venting device includes, in the shaft, a venting hole having a threaded portion and a venting bolt that can be screwed into the venting hole having the threaded portion. After filling the pressure medium, when the venting bolt is screwed in, air or pressure fluid can exit through the outlet passage of the venting bolt. When the screwed-in venting bolt contacts the constriction of the venting hole with a sealing range at its tip, the venting hole is sealed and contains only the pressure medium in the pressure chamber, the pressure medium connection portion, and the venting connection portion. Therefore, the pressure required for the fitting connection can be smoothly achieved by the pressure generating device without interference from the compressible (compressible) remaining air.

[0023] In a preferred embodiment, the axes of the venting device, the venting connection portion, and the pressure medium connection portion extend along a common straight line that intersects, particularly, the shaft axis. When filling the pressure medium through the pressure medium connection portion, the shaft can be oriented to fill the pressure medium connection portion, the pressure chamber, and the venting connection portion so that the pressure medium rises.

[0024] Since the axis of the hole of the pressure generating device extends tangentially to a circle centered on the shaft axis, the hole can extend over a longer length in the shaft compared to a radially oriented hole.

[0025] The access parts to the pressure generating holes and the vent holes are preferably arranged such that both access parts are located above the pressure chamber at an appropriate shaft position. After complete filling with the pressure medium, at the access part to the upward-facing pressure generating hole, the pressure bolt is preferably inserted into the pressure generating hole together with the sealing piston and especially the pressure piston. Subsequently, the vent bolt is screwed on.

[0026] In a particularly preferred embodiment, the tool receiving part comprises, in the contact range, a cylindrical hole formed concentrically with the shaft axis in the shaft, and a cylindrical contact surface in the hole facing towards the shaft axis. This embodiment is configured to accommodate the connection range of the tool in the form of a cylindrical shaft part, and the opening surrounded by the contact surface is such that the tool shaft part can be inserted into the opening surrounded by the contact surface, and at the pressure generated in the pressure chamber by the pressure generating device, a fitting connection can be achieved by deformation of the contact range with respect to the tool shaft part between the contact range and the connection range of the tool, and has a diameter adapted to the diameter of the tool shaft part to be fitted in.

[0027] In other embodiments, the tool receiving part comprises, in the contact range, a cylindrical end range formed concentrically with the shaft axis, and a cylindrical contact surface in the cylindrical end range facing away from the shaft axis. This embodiment is configured to accommodate the connection range of the tool in the form of a cylindrical shaft part, and the cylindrical contact surface facing away from the shaft axis is such that the tool can slide through the cylindrical part formed by the contact surface, and at the pressure generated in the pressure chamber by the pressure generating device, a fitting connection can be achieved by deformation of the contact range with respect to the cylindrical hole of the tool to be fitted in between the contact range and the connection range of the tool, and has a diameter adapted to the diameter of the cylindrical hole of the tool to be fitted in.

[0028] In an advantageous configuration, the contact area is formed in a sleeve coupled to the shaft. The sleeve borders (adjacent to) the pressure chamber with respect to the connection area of ​​the tool to be clamped, and is tightly coupled to the shaft at its end face. In particular, the pressure chamber is formed in the sleeve as a recess positioned away from the contact surface.

[0029] In one configuration having at least two pressure chamber ranges, a separation is formed between at least two pressure chamber ranges, which can be formed, for example, by the web of the shaft, or by a range of sleeves that have no recess or a recess that is not very deep. The separation ensures that the sleeve deforms less there when pressure is applied, or more within the pressure chamber range. The greater deformation in at least two spaced-apart ranges improves the accuracy of aligning the fitted tool.

[0030] An advantageous tool holder includes an adapter following the contact area, which is adapted to the connection area of ​​the tool facing away from the contact area. When the adapter is fitted between the contact area of ​​the tool holder and the connection area of ​​the tool, the pressure generated in the pressure chamber by the pressure generator allows for deformation of the adapter relative to the connection area of ​​the tool to be clamped, and this deformation enables a mating coupling of the contact area via the adapter to the connection area of ​​the tool to be clamped.

[0031] According to another preferred embodiment, the positioning connector includes at least one connecting surface for positioning in a support device of a machining tool, the connecting surface being able to contact a positioning surface of the support device for positioning a tool holder. The connecting surface can be formed on a portion of the housing, particularly on the cylindrical outer surface of the housing, which is able to contact a positioning surface of the support device, particularly on the cylindrical inner surface. The connecting surface can be formed, for example, as the inner surface of a hole or as the outer surface of a pin, the hole or pin being formed in the positioning connector, and the support device correspondingly having a pin or hole as a positioning surface.

[0032] If the positioning connector is positioned on the positioning surface of the support device with its connecting surface, the tool holder, particularly the positioning connector, is fixed to the support device by a coupling element. To achieve a holding force between the coupled parts, the tool holder includes an engagement range for the coupling element, which, in engagement with the engagement range, is capable of achieving a holding force between the tool holder and the support device. If the coupling element is a bolt, the engagement range is preferably a hole, which may optionally have a female thread. The bolt is capable of contacting the opening of the hole with its bolt head and being screwed into the threaded portion of the support device. In some cases, the bolt head is in contact with the hole in the support device and is screwed into the threaded portion of the tool holder.

[0033] Preferably, the tool holder and support device are formed such that a drive connection at the rear end of the shaft of the tool holder, which is fixed to the support device, engages with a drive transmission portion of the support device. In one advantageous embodiment, the drive connection of the tool holder is formed as a gear, which meshes with a driveable gear of the support device after the tool holder is fixed to the support device.

[0034] The present invention will be described with reference to the drawings based on two embodiments, but the present invention is not limited to these embodiments. [Brief explanation of the drawing]

[0035] [Figure 1] This is a perspective view of a tool holder having a tool clamped inside a cylindrical contact surface. [Figure 2] Figure 1 is a perspective view of a tool holder with a cut-off area. [Figure 3] Figure 1 is a perspective view of a tool holder with a cut-off area. [Figure 4] Figure 1 is a perspective view of a tool holder with a cut-off area. [Figure 5] This is a view of the end face of the tool holder according to Figure 1, showing the cut-off area. [Figure 6] This is a perspective view of a tool holder having a tool clamped on the outside of a cylindrical contact surface. [Figure 7] This is a front perspective view of a support device having a fitted tool holder. [Figure 8] This is a rear perspective view of a support device with a tool holder. [Modes for carrying out the invention]

[0036] Figures 1 to 5 show a tool holder 1 according to the present invention having a housing 2 with a positioning connector 3 for positioning as shown in Figures 7 and 8 in a support device 4 of a processing machine. The tool holder 1 includes a shaft 5 extending along the shaft axis. The tool holder 1 includes a tool housing 6 at the front end 5a of the shaft 5 that clamps the connection range of a tool 7.

[0037] The shaft 5 is supported in the housing 2 by a rotation support so as to be rotatable about the shaft axis. The rotation support of the shaft 5 includes a front rotation bearing 8a and a rear rotation bearing 8b, of which the front rotation bearing 8a is located closer to the front end 5a of the shaft 5 than the rear rotation bearing 8b. The shaft 5 has a drive connection 9, preferably in the form of a gear, at its rear end 5b, which faces away from the front end 5a. As shown in Figure 8, the drive connection 9 or gear is formed at the rear end 5b of the shaft 5 so that the drive connection can be driven by the drive transmission unit 10 of the support device 4, particularly the gear to be driven, after the tool holder 1 is placed in the support device 4.

[0038] The tool housing 1 includes a contact area 11 to which the connection area 7a of the tool 7 to be clamped can make contact, and a pressure chamber 12 having two pressure chamber areas 12a formed concentrically with respect to the shaft axis and capable of being filled with a pressure medium. The pressure chamber areas 12a are arranged to be spaced apart from each other in the direction of the shaft axis and are connected to a pressure generating device 14 on the shaft 5 via a pressure medium connection area 13. The pressure generating device 14 is located in an area extending from the front end 5a of the shaft 5 to the front rotating bearing 8a.

[0039] In the illustrated embodiment, the pressure generating device 14 includes a pressure generating hole 14a having a threaded portion in the shaft 5 and a pressure bolt 14b that can be screwed into the pressure generating hole 14a. To prevent leakage of the pressure medium at the pressure bolt 14b, the pressure generating device 14 preferably includes a pressure piston 14c and a seal piston 14d at the end of the pressure bolt 14b facing the pressure medium connection portion 13 in the non-threaded portion of the pressure generating hole 14a. The pressure medium filling the pressure chamber range 12a and the pressure medium connection portion 13 allows the pressure required for the mating connection to be achieved in the pressure chamber range 12a by screwing in the pressure bolt 14b.

[0040] In the illustrated embodiment, the pressure chamber range 12a is connected to a sealable venting device 16 via a venting connection 15 formed on the shaft 5, and the sealable venting device 16 is positioned in a range extending from the front end 5a of the shaft 5 to the forward rotating bearing 8a. The venting device 16 comprises a threaded vent hole 16a on the shaft 5 and a venting bolt 16b that can be screwed into the vent hole 16a. After filling with pressure medium, when the venting bolt 16b is screwed in, air or pressure fluid can escape through the outlet passage of the venting bolt 16b. When the screwed-in venting bolt 16b contacts the constricted portion of the vent hole 16a with its sealing range at its tip, the vent hole 16a is sealed, and since the pressure chamber range 12a, pressure medium connection 13 and venting connection 15 contain only pressure medium, the pressure generator 14 can smoothly achieve the pressure required for the mating coupling without interference.

[0041] In the illustrated embodiment, the axes of the venting device 16, the venting connection 15, and the pressure medium connection 13 extend along a common straight line intersecting the shaft axis. When filling the pressure medium through the pressure medium connection, the shaft 5 can be adjusted to orient itself to fill the pressure medium connection 13, the pressure chamber range 12a, and the venting connection 15 so that the pressure medium rises.

[0042] Since the axis of the pressure generating hole 14a extends tangentially to a circle centered on the shaft axis, the hole can extend over a longer length on the shaft 5 compared to a radial hole. The access portions to the pressure generating hole 14a and the vent hole 16a are preferably positioned so that both access portions are located above the pressure chamber range 12a at an appropriate shaft position. After complete filling with the pressure medium, the pressure bolt 14b is inserted into the pressure generating hole 14a at the upward-facing access portion to the pressure generating hole 14a, together with the seal piston 14d and the pressure piston 14c. Subsequently, the vent bolt 16b is screwed in.

[0043] The pressure chamber range 12a achieves a fitted connection between the contact range 11 and the connection range 7a of the tool 7 by deformation of the contact range 11 relative to the connection range 7a, in the connection range of the tool 7 adjacent to the contact range 11 and in the pressure generated in the pressure chamber range 12a by the pressure generator 14. Preferably, oil or, in some cases, grease (lubricating oil) is used as the pressure medium.

[0044] The tool holders shown in Figures 1 to 5, 7 and 8 include a cylindrical hole 11a formed in the shaft 5 concentrically with respect to the shaft axis within the contact area 11, and a cylindrical contact surface in the hole facing the shaft axis. The cylindrical hole 11a, or the cylindrical contact surface formed by the inner surface, is configured in the form of a cylindrical shaft to accommodate the connection area 7a of the tool 7.

[0045] The tool holder 1 shown in Figure 6 comprises a cylindrical end range 11b formed concentrically with respect to the shaft axis within the contact range 11, and a cylindrical contact surface within the cylindrical end range that faces away from the shaft axis. The cylindrical end range 11b, or the cylindrical contact surface formed by the outer surface, is configured in the form of a cylindrical through-hole or cylindrical hole to accommodate the connection range 7a of the tool 7. The cylindrical contact surface facing away from the shaft axis has a diameter that matches the diameter of the cylindrical hole of the tool 7 into which it is to be fitted, so that the tool 7 can be pushed in across the cylindrical portion formed by the contact surface. The pressure generated in the pressure chamber range 12a by the pressure generator 14 causes deformation of the contact range 11 relative to the connection range 7a of the tool 7, thereby achieving a mating connection between the contact range 11 and the connection range 7a of the tool 7.

[0046] The tool schematically shown in Figure 6 extends away from the ring-shaped tool connection portion in the connection range 7a or cross-section, and is formed, for example, as a circular saw blade. A pressure generating device 14 is fitted into the end face of the cylindrical end range 11b. The venting device is located on the shaft 5, for example, between the tool connection portion and the positioning connection portion 3.

[0047] In both embodiments shown in Figures 1 to 8, a contact surface is formed on the sleeve 17 coupled to the shaft 5. The sleeve 17 defines (is adjacent to) the pressure chamber range 12a with respect to the connection range 7a of the tool 7 to be clamped, and is tightly coupled to the shaft 5 at its end face. In particular, the pressure chamber range 12a is formed in the sleeve 17 as a recess positioned opposite to the contact surface.

[0048] The positioning connection portion 3 includes a portion of the housing 2, which is used as a connection surface 18 for positioning the tool holder 1 on a positioning surface 19 formed by a hole in the support device 4. The connection surface 18 may also include the inner surface of the hole that interacts with the pin 20 of the support device 4 for positioning. The positioned tool holder 4 is fixed to the support device 4 by, for example, two fixing bolts 21.

Claims

1. A tool holder (1) comprising a housing (2) equipped with a positioning connection portion (3) for positioning in a support device (4) of a processing machine, a shaft (5) extending along the shaft axis and rotatably supported in the housing (2) by a rotation support portion, wherein the rotation support portion of the shaft (5) includes front and rear rotation bearings (8a, 8b), and the front rotation bearing (8a) is located closer to the front end portion (5a) of the shaft (5) than the rear rotation bearing (8b), and a tool housing portion (6) located at the front end portion (5a) of the shaft (5) for clamping the connection range (7a) of a tool (7), The shaft (5) is provided with a drive connection portion (9) at its rear end (5b) facing away from the front end portion (5a), and the drive connection portion is formed to be driven by the drive transmission portion (10) of the support device (4) after the tool holder (1) is positioned in the support device (4), and the tool housing portion (6) is provided with a pressure chamber (12) that is formed concentrically with respect to the shaft axis and can be filled with a pressure medium in a contact area (11) where the connection area (7a) of the tool (7) to be clamped can come into contact, and the pressure chamber is provided on the shaft (5) with a pressure medium A tool holder (1) is connected to a pressure generating device (14) via a body connection portion (13), the pressure generating device (14) is positioned in a range extending from the front end portion (5a) of the shaft (5) to the front rotating bearing (8a), and the pressure chamber (12) is characterized in that a fitted connection can be achieved between the contact area (11) and the connection area (7a) of the tool (7) by deformation of the contact area (11) relative to the connection area (7a) in the connection area (7a) of the tool (7) adjacent to the contact area (11), and in the pressure generated in the pressure chamber by the pressure generating device (14).

2. The tool holder (1) according to claim 1, wherein the pressure chamber comprises at least two pressure chamber ranges (12a) formed concentrically with respect to the shaft axis, the pressure chamber ranges are arranged relatively far apart from each other in the direction of the shaft axis, and a fitting-type coupling can be achieved between the contact range (11) and the connection range (7a) of the tool (7) by the pressure generated in the pressure chamber (12) by the pressure generating device (14) through deformation of the contact range (11) with respect to the connection range (7a) in the at least two pressure chamber ranges (12) - the tool holder (1).

3. The tool holder (1) according to claim 1 or 2, wherein the pressure generating device (14) comprises a pressure generating hole (14a) having a threaded portion and a pressure bolt (14b) that can be screwed into the threaded portion of the shaft (5), and the pressure medium filled into the pressure chamber (12) and the pressure medium connecting portion (13) can achieve the pressure necessary for a fitting-type connection in the pressure chamber (12) by screwing in the pressure bolt (14b).

4. The tool holder (1) according to claim 1 or 2, characterized in that the pressure chamber (12) is connected to a sealable venting device (16) via a venting connection portion (15) formed on the shaft (5), and the sealable venting device (16) is arranged in a range extending from the front end portion (5a) of the shaft (5) to the front rotating bearing (8a).

5. The tool holder (1) according to claim 4, wherein the venting device (16) comprises a venting hole (16a) having a threaded portion and a venting bolt (16b) that can be screwed into the threaded portion, and after filling with pressure medium, air or pressure medium can be released from the venting connection portion (15) by screwing in the venting bolt (16b), and as a result, after the venting bolt (16b) is fully screwed in, only pressure medium is contained in the pressure medium connection portion (13), the pressure chamber (12), and the venting connection portion (15), and the pressure required for the mating connection can be achieved by the pressure generating device (14).

6. The tool holder (1) according to any one of claims 1 to 5, characterized in that the tool housing portion (6) comprises a cylindrical hole (11a) formed in the shaft (5) concentrically with respect to the shaft axis within the contact area (11), and a cylindrical contact surface in the hole facing the shaft axis.

7. The tool holder (1) according to any one of claims 1 to 5, characterized in that the tool housing portion (6) comprises a cylindrical end portion (11b) formed concentrically with respect to the shaft axis in the contact area (11), and a cylindrical contact surface in the cylindrical end portion that faces away from the shaft axis.

8. The tool holder (1) according to claim 6 or 7, characterized in that the contact area is formed in the sleeve (17), the sleeve (17) defines the pressure chamber (12) with respect to the connection area (7a) of the tool (7) to be clamped, and is tightly coupled to the shaft (5) at its end face side.

9. The tool holder (1) according to claim 8, characterized in that the pressure chamber (12) is formed as a recess in the sleeve (17).

10. The tool holder (1) according to any one of claims 1 to 9, wherein the tool holder (1) includes an adapter connected to the contact area (11), the connection area (7a) of the tool (7) to be clamped is capable of contacting the adapter, and the pressure generated in the pressure chamber (12) by the pressure generator (14) is capable of causing deformation of the adapter with respect to the connection area (7a) of the tool (7) to be clamped, and thereby achieving a fitted coupling of the contact area (11) to the connection area (7a) of the tool (7) to be clamped via the adapter.

11. The tool holder (1) according to any one of claims 1 to 10, characterized in that the positioning connection portion (2) includes at least one connecting surface (18), the connecting surface being able to contact the positioning surface (19) of the support device (4) for positioning the tool holder (1).

12. The tool holder (1) according to claim 11, wherein the tool holder (1) includes an engagement range for a coupling element (21), and the coupling element (21) is capable of achieving a holding force between the tool holder (1) and the support device (4) in engagement with the engagement range.

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