Abstract
The invention relates to a machine tool, in particular a hand held machine tool, which has a tool receiving device that is movable, in particular in an oscillating manner, around an output shaft. The tool receiving device is designed to hold a tool device on the machine tool in such a manner that the output shaft and a tool rotation axis substantially coincide. The tool receiving device has at least one torque transmission region and a holding device. In order to transmit a driving force to the tool device, the torque transmission region has at least two output area regions that are arranged at a distance from said output shaft and each have a multiplicity of surface points. Here, the tangent planes to said surface points are inclined in regard to an axial plane which includes said output shaft. Furthermore, the tangent planes are inclined in regard to a radial plane which extends perpendicularly to the output shaft. In this way, the output torque is transmitted reliably to the tool device by the machine tool via the tool receiving device.
Claims
1. A machine tool, and in particular a hand guided machine tool having a tool receiving device which is movable around an output shaft, and in particular which is movable in an oscillating manner around the output shaft, wherein said tool receiving device is adapted to hold a tool device in such a manner on the machine tool that the output shaft and a tool rotating axis are substantially coincident, wherein said tool receiving device comprises at least one torque transmission region and a holding device, wherein said torque transmission region has at least two output area regions being spaced apart from the output shaft for transmitting a driving force to the tool device, each output area region having a plurality of surface points, wherein tangent planes to these surface points are inclined relative to an axial plane which includes the output shaft, wherein said tangent planes are inclined relative to a radial plane extending perpendicular to the output shaft, and wherein a normal to one of the tangent planes is oriented in a radial direction toward the output shaft.
2. The machine tool according to claim 1, wherein at least one, preferably a plurality, and particularly preferably all of these output area regions are at least in sections substantially planar.
3. The machine tool according to claim 1, wherein at least one, preferably a plurality, and preferably all of these output area regions are at least partially curved.
4. The machine tool according to claim 1, wherein that this torque transmission region has at least a first upper boundary plane and at least a second lower boundary plane, wherein these boundary planes are disposed substantially perpendicular to said output shaft, that these boundary planes are spaced apart, and that each of these output area regions is disposed between one of these first upper boundary planes and one of these lower second boundary planes.
5. The machine tool according to claim 4, wherein a large number, preferably all of these output area regions extend between one single first upper boundary plane and one single second upper lower boundary plane.
6. The machine tool according to claim 1, wherein the torque transmission region has a plurality of output area regions which are arranged rotationally symmetrical around the output shaft.
7. The machine tool according to claim 1, wherein at least two, preferably several, of these output area regions are arranged symmetrically to a plane of symmetry, that the output shaft is located in this plane of symmetry, and that more preferably these output area regions are arranged substantially contiguously.
8. The machine tool according to claim 1, wherein this torque transmission region has a side wall, and that this side wall extends from the output shaft spaced radially, and that this side wall comprises the output area regions.
9. The machine tool according to claim 8, wherein said side wall extends substantially closed radially around the output shaft.
10. The machine tool according to claim 1, wherein all of the normals of these tangent planes are oriented in the radial direction toward to the output shaft.
11. The machine tool according to claim 1, wherein between one of these tangent planes and this radial plane the angle α is enclosed, wherein said radial plane is perpendicular to the output shaft, that the angle α is preferably less than 90 degrees, and more preferably less than 80 degrees and particularly preferably less than 75 degrees, and more preferably that the angle α is larger than 0 degrees, and more preferably larger than 45 degrees and particularly preferably larger than 60 degrees, and more preferably that the angle is in a range from 62.5 degrees to 72.5 degrees.
12. The machine tool according to claim 1, wherein between one of these tangent planes and this axial plane, wherein the output shaft is located in this axial plane, the angle β is included such that the angle β is preferably less than 90 degrees, and more preferably less than 70 degrees and particularly preferably less than 65 degrees, and that more preferably the angle β is larger than 0 degrees, more preferably larger than 15 degrees and particularly preferably larger than 30 degrees, and that more preferably the angle β is substantially 30 degrees, 45 degrees or 60 degrees.
13. The machine tool according to claim 1, wherein this torque transmission region has an even number of the output area regions, preferably 4 or more, more preferably 8 or more, and particularly preferably 16 or more and, preferably 64 or less, more preferably 48 or less and particularly preferably 32 or less.
14. The machine tool according to claim 1, wherein the output area regions are essentially star-shaped, and that preferably they are arranged in the form of a star-shaped polygon, the polygon having 4 or more corners.
15. The machine tool according to claim 1, wherein the machine tool has an encoding device, that this encoding device comprises at least a first cross-sectional area, that this encoding device has a first extension substantially in the direction perpendicular to this cross-sectional area, and preferably that this first extension is directed in the direction of said output shaft.
16. The machine tool according to claim 16, wherein one of these encoding devices or several of these encoding devices are arranged with a rotational symmetry around this output shaft.
17. The machine tool according to claim 16, wherein the shape of at least one, preferably all, encoding devices is selected from a group of shapes comprising at least: a polygon having a plurality of corners, a circle, an ellipse, an arc with a variable or a constant radius, or a combination of several of these shapes.
18. The machine tool according to claim 1, wherein this holding device comprises at least one device selected from a group of devices or that this holding device comprises a combination of several of these devices selected from the group of devices, and that this group includes in particular the following devices: a screw device, a tie bean device, a hook means a clip device, a ratchet device, a bayonet closure device, a device with locking projections, and a device with ball sections and blocking sections, and in particular with spherical cap recesses.
19. The machine tool system with a machine tool according to claim 1 with a tool receiving device which holds a tool device on the machine tool such that the output shaft of the machine tool and a tool axis of rotation coincide substantially.
20. The machine tool system according to claim 20, wherein the holding device has at least one effective area for transmitting a force acting on the tool device and, wherein, in a direction along the output shaft, on the side facing away from the machine tool the holding device is limited by a holding device boundary surface, and that the tool device comprises a tool connection region and a tool axis of rotation, wherein the tool connecting region comprises at least one side wall and the tool connecting region extends in the axial direction between a first orthogonal plane and a second orthogonal plane, these planes being disposed orthogonal to the tool axis of rotation, said side wall being spaced radially from the tool axis of rotation and having an axial extension in the direction of the tool axis of rotation, and that the holding device exerts a force on the tool device in the region of the effective area, and that this force has at least one component in the direction of the tool axis of rotation.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0086] The following figures show various features and embodiments of the invention and they are partially in a schematic form, wherein a combination of the individual features and the embodiments beyond the figures is also possible.
[0087] Here, the following is showed:
[0088] FIG. 1 shows a side view (FIG. 1a) and a plan view (FIG. 1 b) of a torque transmission region with two output surface regions,
[0089] FIG. 2 shows a side view of a torque transmission region with output area regions, which extend between boundary planes,
[0090] FIG. 3 shows a plan view (FIG. 3a) and a side view (FIG. 3b) of a torque transmission region with the two output surface areas, which are disposed abutting one another,
[0091] FIG. 4 shows a plan view (FIG. 4a) and a side view (FIG. 4b) of a section of a torque transmission region and the inclination of an output surface area to the angle β,
[0092] FIG. 5 shows a sectional view of a torque transmission region and the inclination of a drive surface area at the angle a,
[0093] FIG. 6 shows a perspective view of a torque transmission region with a star-shaped arrangement of the output surface areas around the output shaft,
[0094] FIG. 7 shows a plan view (FIG. 7a) and a side view (FIG. 7b) of a torque transmission region with a star-shaped arrangement of the output surface areas,
[0095] FIG. 8 shows two sectional views of torque transmission regions with different encoding devices,
[0096] FIG. 9 shows a sectional view of a machine tool system,
[0097] FIG. 10 shows a plan view of the profile of the side wall of the tool device which has the tool drive surface regions,
[0098] FIG. 11 shows perspective views of contact areas (FIG. 11 a, point contact; FIG. 11b, line contact; FIG. 11c, surface contact) between the output surface areas and the tool drive surface regions,
[0099] FIG. 12 shows perspective views of differently curved output surface areas,
[0100] FIG. 13 shows a sectional view of a tool device which is held on the machine tool by means of a screw device,
[0101] FIG. 14 shows a sectional view of a tool device which is held on the machine tool by means of a tie bar device and a nut member,
[0102] FIG. 15 shows side view of a machine tool with a tool device,
[0103] FIG. 16 shows a plan view (from below) of an embodiment of the torque transmission region of the machine tool,
[0104] FIG. 17 shows a sectional view of one embodiment of torque transmission region of the machine tool.
DETAILED DESCRIPTION
[0105] The FIG. 1 shows two views of a torque transmission region 9 of a tool receiving device (FIG. 1a a front view, FIG. 1b a plan view). This torque transmission region 9 has two output area regions 9a, on each of which a plurality of surface points 9b are shown. The torque transmission region 9 is adapted to transmit the driving forces of the machine tool to a tool device (not shown). The machine tool drives the tool device in a rotating oscillating manner, thereby the tool device oscillates around the output shaft 2, which substantially coincides with the tool axis of rotation. The output shaft 2 is a fictional, geometrical axis.
[0106] The FIG. 2 shows a torque transmission region 9 of a machine tool, this is adapted to transmit the driving forces from the machine tool to the tool device (not shown). The torque transmission region 9 has two output area regions 9a. On each output area region 9a several area points 9b are shown. The output area regions 9a each extend between an upper boundary plane 13 and a lower boundary plane 14, wherein the upper boundary planes coincide in one boundary plane 13. The boundary planes 13/14 are arranged perpendicular to the output shaft 2. By means of the machine tool, the tool device (not shown) is rotationally driven oscillating around the output shaft 2.
[0107] The FIG. 3 shows two views of a torque transmission region 9 of a machine tool (FIG. 3a plan view, FIG. 3b front view). The torque transmission region 9 is provided for transmitting the driving forces from a machine tool to a tool device (not shown), the tool device is driven in rotationally oscillating manner around the output shaft 2. In each case, two output area regions 9a are positioned abutting against each other, and several of these output area regions 9a are arranged rotationally symmetrical around the output shaft 2. The output shaft 2 is a fictional, geometrical axis. The output area regions 9a extend between a single upper boundary plane 13 and a single lower boundary plane 14. In each case, two output area regions 9a are connected to two further output area regions 9a by means of a connecting region 9c. By the abutting arrangement of the output area regions 9a, these can support each other, and a particularly stable torque transmission region 9 is enabled. Due to the rotationally symmetric arrangement of the output area regions 9a, it is possible to offset the tool device in discrete steps around the output shaft, thus a more flexible use of the machine tool is possible.
[0108] The FIG. 4 shows two views of a section of torque transmission region 9 of the machine tool (FIG. 4a plan view, FIG. 4b front view). An axial plane 15 includes the output shaft 2. A tangent plane 17 is tangent to the output area region 9a in a surface point 9b. The tangent plane 17 includes the acute angle β with the axial plane 15.
[0109] The FIG. 5 shows a sectional view of a torque transmission region 9 of a machine tool. The torque transmission region 9 has a plurality of output area regions 9a. A tangent plane 17 is tangent to one of these output area regions 9a in a surface point 9b. A radial plane 16 is arranged orthogonal to the output shaft 2. The radial plane 16 includes the acute angle α with the tangent plane 17.
[0110] The FIG. 6 shows a tool receiving device 1 in a three-dimensional illustration. The torque transmission region 9 has a plurality of output area regions 9a. These output area regions 9a are arranged rotationally symmetrical in a star-shaped manner around the output shaft 2. A tool device (not shown) can be held at the machine tool by the hook device 4a/b. The output area regions 9a are arranged in such a way that a surface normal 18 to one of these output area regions 9a faces in the direction to the output shaft 2. It follows that the torque transmission region 9 is designed primarily as a recess with a star-shaped profile. The output area regions 9a are arranged contiguously and they extend radially closed around the output shaft 2. By this arrangement, a particularly stable torque transmission region 9 is made possible, which allows a uniform application from the driving forces of the machine tool to the tool device (not shown).
[0111] The FIG. 7 shows a torque transmission region 9 of a tool receiving device of a hand guided machine tool, wherein the FIG. 7a shows a plan view of the tool receiving device and the FIG. 7b shows a front view of the tool receiving device. A tool device (not shown) can be hold at a torque transmission region 9 by means of the hook device 4a/b. For this purpose, the hook device 4a/b can be moved in opposite directions. The torque transmission region 9 has a plurality of output surface areas 9a, these are arranged radially closed circumferential to the output shaft 2 and they are arranged star-shaped. A surface normal 18 on one of these output area regions 9a is oriented away from the output shaft 2. By such an arrangement of the output area regions 9a, a particularly simple tool receiving device can be achieved.
[0112] The FIG. 8 shows two partial sectional views of the torque transmission regions 9 of a tool receiving device of a hand guided machine tool, wherein in this figure different encoding device 19 are shown. The FIG. 8a shows a torque transmission region 9 with a plurality of output area regions 9a. The output area regions 9a are arranged in a star-shaped manner around the output shaft 2 and they are radially spaced therefrom. In the area of the output shaft 2, a encoding device 19a is arranged as a raised portion, while this encoding device 19a is adapted to engage into a recess in the tool device (not shown). The encoding device 19a is arranged circular and rotationally symmetric to the output shaft 2. The FIG. 8b shows a torque transmission region 9 with a plurality of output area regions 9a. The output area regions 9a are arranged in a star-shaped manner around the output shaft 2 and radially spaced to it. In the area of the output shaft 2, an encoding device 19b is arranged as a recess, thereby this encoding device 19b is adapted that a raised portion of a tool device (not shown) engages in it.
[0113] The FIG. 9 shows a machine tool system or a processing system comprising a tool receiving device 1 and a tool device 8. The tool device 8 is accommodated in the tool receiving device 1 in such a manner that the output shaft 2 and the fictive, geometric tool axis of rotation 8b are coincident. The tool device 8 has a tool attachment region 8a, which extends between a first orthogonal plane 8c and a second orthogonal plane 8d. The tool driving area region 8f is disposed between the first orthogonal plane 8c and the second orthogonal plane 8d. The first orthogonal plane 8c limits the tool attachment region 8a on the machine tool side facing in the direction of the tool axis of rotation 8b, the second orthogonal plane 8d limits the tool attachment region 8a on the side facing away from the machine tool side. The tool driving region 8f is provided for the transmission of the driving forces from the machine tool to the tool device 8 and it extends in the axial direction in the region 8g. For this purpose, the tool driving region 8f comprises at least in sections, the negative form of the output area region 9a, thus enabling a form fit connection between the tool device 8 and the tool receiving device 1. The tool device 8 has a tool encoding device 8e, wherein the first hook device 4a and the second hook device 4b of the holding device 4 grip through it. The hook devices 4a/b apply in the region of the operating area 4c a holding force effect 4h on the tool device 8. The tool device 8 is held by the holding force effects 4h on the machine tool. By the double inclination around the angle α and the angle β (not shown) of the output area regions 9a of the torque transmission region 9, the tool device 8 is held free from backlash in the tool receiving device 1. The holding force effects 4h are applied indirectly by the clamping device. 3 The hook devices 4a/b of the holding device 4 are mounted rotatably around the hook pivot point 4d. The clamping device 3 contacts by means of the moving member 6 the holding device 4. By the design of the guiding recess 5e, the sum of the holding force effects 4h is enlarged in regard to the clamping force 3a, and it allows a particularly secure holding of the tool device 8 in the tool receiving device 1.
[0114] The FIG. 10 shows the progression of the tool side wall 8i, which has the tool driving area regions 8f The tool driving area regions 8f are arranged in a star-shaped manner around the tool axis of rotation 8b, and they are partly conjugated to the output area regions 9a of the torque transmission region (not shown). The tool side wall 8i extends in the region of the tool driving area regions 8f between a first distance r1 and second distance r2 to the tool axis of rotation 8b. The tool driving area regions 8f have it selves tool surface points 8h. Due to the progression of the tool driving area regions 8f, which has been adapted to the output area regions 9a of the torque transmission area (not shown), a form fit transmission of the driving forces from the machine tool to the tool device 8 is made possible allowing that very large driving forces are transmitted securely.
[0115] The FIG. 11 shows various contact regions 20a, 20b, 20c between the tool driving area regions 8f and the output area regions 9a of the torque transmission region 9. Here, the form and the type of the shape of the two driving/output surface regions 8f/9a and their interaction depends on these contact regions 20a, 20b, 20c. The FIG. 11a shows a point shaped contact region 20a, wherein this contact region 20a has a circular extension or an elliptical extension. A point shaped contact area 20a is particularly insensitive to an inaccurate positioning of the tool device in regard to the machine tool, as this can be caused by tolerances in the manufacture of the tool device. The FIG. 11b shows a line shaped contact region 20b, wherein this contact region 20b has a large extension along the line of contact 21, and transverse to this it has a small extension. A line shaped contact region 20b provides a larger contact area compared to the point shaped contact region 20a, and larger driving forces can be transmitted from the machine tool to the tool device. The FIG. 11c shows an area shaped contact region 20c. The area shaped contact region 20c provides a larger contact area compared to a line shaped contact region 20b, and therefore, larger driving forces can be transmitted from the machine tool to the tool device. Compared to a point shaped contact 20a region, a line shaped contact region 20b and an area shaped contact region 20c require a higher accuracy, both in the production of the tool driving area region 8f and in the production of the output area region 9a as well as in the positioning of the tool device on the machine tool. The output area region 9a and tool driving area region 8f can be coordinated in such a manner that an area contact (FIG. 11c) or a linear contact (FIG. 11b) is made only upon the transmission of substantial driving forces, for example during the operation of the machine tool with the rated power.
[0116] The FIG. 12 shows different sections of an output area region 9a. Not shown is a planar output area region, such an output area region is a further preferred embodiment. The FIG. 12a shows an unidirectionally curved section of an output area region 9a. This section of the output area region 9a can be described by means of straight lines a and curved grid gridlines bI. The curved grid lines bI have a constant radius of curvature RI. Such an output area region 9a corresponds in sections to a cylinder jacket surface. As far as several different radii of curvature RI are provided, it corresponds to a conical surface (not shown). In this case, the size of the radius of curvature RI can be chosen in such a way that the output area region 9a changes in the transmission of the driving forces in sections to a plane, or that it adapts to the opposite surface (not shown), so that the tool driving area region 8f cooperates with which these for the transmission of the driving forces. The FIG. 12B shows a section of an output area region 9a with a bidirectional curvature. This section of the output area region 9a can be described by the curved grid lines bI and by the curved grid lines bII. The grid lines bI have a constant radius of curvature RI and the grid lines bII have a constant radius of curvature RII. For the special case that the first radius of curvature RI and the second radius of curvature RII are the same size, such an output area region 9a corresponds to a spherical surface. The FIG. 12b shows an output area region 9a with different radii of curvature RI and RII. In this case, the size of the radii of curvature RI and RII can be chosen such that the output area region 9a changes, at least partially, during the transmission of the driving forces into a plane, or that it adapts to the tool driving area region 8f (not shown), with which it cooperates for the transmission of the driving forces. The FIG. 12c shows a section of the output area region 9a with a bidirectional curvature. This section of the output area region 9a can be described by the grid lines bI having a constant radius of curvature RI and by the grid lines bIa having a variable radius of curvature RIa. In such an output surface portion 9a, also all grid lines can have a variable radius of curvature (not shown). The size of the radii of curvature RIa and RII can be selected so that the output area 9a changes in the transmission of driving forces in sections to a plane, or that it adapts to the tool driving area region 8f (not shown), with which it cooperates for the transmission of the driving forces. In the FIG. 12, concave curved output area region 9a are shown, the above mentioned considerations can be transferred to the convex curved output area regions, accordingly. Advantageously, a concave to convex pairing of the tool driving area region 8f and the output area region 9a is chosen, or convex to concave, respectively, since in this way large driving forces can be transmitted, or a convex to convex pairing or flat to convex pairing is chosen, because in this way a simple positioning of the tool device can be achieved.
[0117] The FIG. 13 shows a tool device 8, which is fixed to the machine tool (not shown) by means of a screw device (fixing screw 9d, washer 9e, nut member 9f). The tool device 8 has an operating region 8j to act on a workpiece or on a workpiece arrangement. The driving forces are transmitted from the tool driving area region 8f to this operating region 8j by means of the tool connection region 8k. The tool device 8 is held on the machine tool by means of the fixing screw 9d, wherein it applies its force action on the tool device 8 by the washer. The transmission of the driving forces from the machine tool to the tool device 8 is achieved substantially by the form fit engagement of the torque transmission region 9 and the tool driving area region 8f. The tool device 8 is held in such a way on the machine tool that the tool axis of rotation 8b and the output shaft 2 substantially coincide. The tool device 8 is rotationally driven to oscillate around the output shaft 2.
[0118] The FIG. 14 shows a tool device 8, which is fixed on the machine tool (not shown) by a further screw device (tie bar device 9g, washer 9e, nut member 9f). The tool means 8 has an operating region 8j to act on a workpiece or on a workpiece arrangement. From the tool driving area, 8f the driving forces are transmitted to this operating region 8j by means of the tool connection region 8k. In this case, the tool device 8 is held on the machine tool by the nut member 9f and the tie bar device 9g, which apply their force action on the tool device 8 by the washer 9e. The transmission of the driving forces of the machine tool on the tool device 8 is achieved substantially by the form fit engagement of the torque transmission region 9 and the tool driving area region 8f. The tool device 8 is held in such a way on the machine tool that the tool axis of rotation 8b and the output shaft 2 substantially coincide. The tool device 8 is rotationally oscillating driven around the output shaft 2.
[0119] The FIG. 15 shows a machine tool system comprising a tool device 8, which is received in a machine tool 22. The tool device 8 has a tool attachment region 8a, by which it is connected to the machine tool 22. The machine tool 22 has an output spindle 22a, which guides the driving forces to the tool device 8, and in particular to the tool connecting region 8a. The output spindle 22a moves around the output shaft 2, in particular rotationally oscillating, thereby the tool device 8 is also set in a similar motion. The tool device 8 has an operating region 8j, which is adapted to act on a workpiece or on a workpiece arrangement (not shown). The driving forces of the machine tool 22 are transmitted from the tool attachment region 8a to the operating region 8j by the tool connection region 8k. The machine tool 22 has an operating lever 22b, which is adapted to enable a change of the tool device 8.
[0120] The FIG. 16 and the FIG. 17 show a torque transmission region 9 of a machine tool in different views. The FIG. 16 shows a view from below and the FIG. 17 shows a sectional view of the side view of the torque transmission region 9. In this case, a view from below should be understood in that it is seen to the torque transmission region 9 from the direction from which the tool device is inserted into the machine tool. The torque transmission region 9 of the machine tool is illustrated in the FIG. 16 and in the FIG. 17 as a star-shaped polygon with rounded corners, while the below mentioned relationships can also be applied, at least mutatis mutandis, to other forms of such a torque transmission region 9.
[0121] In the bottom view, the FIG. 16, the rounded corners (transition regions 9h) of the polygon can be seen. A so-called arm of the polygon is formed by two output area regions 9a and a transition region 9h. Here, such a transition region 9h should be preferably understood as a rounding having a variable radius or a constant radius. Further preferably, such a transition region 9h abuts tangentially to one of the or to both of the output area regions 9a. Further preferably, the variable or the constant radius of such a transition region 9h is selected from a range between 0.25 mm and 10 mm, preferably it is selected from a range between 1 mm and 5 mm, and more preferably it is selected from a range between 2.5 mm and 4 mm. The individual arms of the polygon are offset to each other by an equidistant angle k12. Preferably, here this, preferably equidistant, angle k12 results from the relationship: Full circle/(number of arms)=k12; for the present case 360 degrees/12=30 degrees. Preferably, by the equidistant angular k12, it is possible to accommodate the tool device (not shown) in different rotational positions in this torque transmission region 9, and thus to accommodate it in the machine tool. In the present case, the tool device can be offset against the torque transmission region 9 in discrete steps of 30 degrees.
[0122] The torque transmission region 9 has a machine tool cover surface section 9i. In this machine tool cover surface section is arranged a, preferably circular, recess having a diameter k10. This recess having the diameter k10 is adapted to receive a connecting device (not shown) and to cooperate with it, respectively. By means of the connection device, the tool device (not shown) is held on the machine tool. Further preferably, forms differing from the circular shape are also possible for this recess. Preferably, this recess (not shown) is constructed as a sort of a through recess or a blind hole recess with or without a threaded portion, or as a passageway for the holding device (not shown).
[0123] The diameters of k2 and k3 describe the inner diameters of the torque transmission region. In a preferred embodiment, the inner diameter k2 is preferably selected from a range between 30 mm and 36 mm, preferably it is selected from a range between 32 mm to 34 mm, and more preferably the inner diameter k2 is substantially 33.35 mm (+/−0.1 mm).
[0124] In a preferred embodiment, the inner diameter k3 is preferably selected from a range between 22 mm and 27 mm, preferably it is selected from a range between 24 mm to 26 mm, and more preferably the inner diameter k3 is substantially 25 mm (+/−0.1 mm).
[0125] The distance k1 defines the distance of the two output area regions 9a, which are parallel to each other in this view (in a spatial view, the output area regions 9a are still inclined to each another). Compared with a screw head (for example, an hexagonal bar), the distance k1 corresponds to a key length.
[0126] In a preferred embodiment, this key length k1 is preferably selected from a range between 26 mm and 30 mm, preferably it is selected from a range between 27 mm and 29 mm, and more preferably, the key length is substantially 28.4 mm (+/−0.1 mm).
[0127] The diameter of 25 indicates a reference diameter for the torque transmission region 9 of the machine tool. In a preferred embodiment, the reference diameter 25 is preferably selected from a range between 31 mm and 33 mm, preferably it is selected from a range between 31, 5 mm and 32.5 mm, and more preferably the reference diameter 25 is substantially 32 mm (+/−0.1 mm). In this case, the reference diameter 25 should be construed further preferably as a nominal dimension of the torque transmission region 9 and be defined in the direction of the output shaft in a certain height.
[0128] In the sectional view, the FIG. 17, the cross-sectional area of the torque transmission region 9 can be seen particularly well. In this case, the torque transmission region 9 is designed primarily as a blind hole. Said recess is tapered in the direction of the output shaft 2 in the upward direction and is has substantially the shape of a truncated cone. The cross-sectional surface of this truncated cone has preferably the form, which is illustrated in the FIG. 16, of a polygon with rounded corners, wherein said cross-sectional area are arranged orthogonal to the output shaft 2.
[0129] It has been found that particularly long lifetimes can be achieved for these torque transmission region 9 as well as for this tool device 1, which is accommodated into it, if certain transitions are rounded, in particular those to the output area regions 9a or between them. Such a rounding should be understood in that the transition to the output area regions has a constant radius or a variable radius.
[0130] Further preferably, the variable radius or the constant radius of such a region as well as of the transition region 9h is selected from a range between 0.25 mm and 10 mm, preferably it is selected between 1 mm and 5 mm, and more preferably it is selected between 2.5 mm and 4 mm.
[0131] The output area regions 9a are inclined in the illustration of the FIG. 17 by the angle k13 in regard to an imaginary vertical line (parallel to the output shaft 2). In a preferred embodiment, this angle is selected from a range between 10 degrees and 30 degrees, preferably it is selected from a range between 17.5 degrees and 22.5 degrees, and more preferably the angle is substantially 20 degrees k13 (+/−0.5 degrees).
[0132] The diameter k2 preferably indicates the area of the torque transmission region 9, from which the output surface areas 9a (from below in the direction of the output shaft 2) extend substantially in a straight line. After this straight line progression, the output surface areas 9a proceed, preferably into the radius k9 and then into the machine tool cover surface section 9i.
[0133] In a preferred embodiment, the output surface areas 9 extend at a height (a direction parallel to the output shaft 2) at least for the measure k14 substantially in a straight line. A straight line according to the invention should be understood in that it has no significant curvature, preferably in an unloaded state, further preferably also in a loaded state. Preferably, the measure k14 is selected from a range between 1, 5 mm and 10 mm, preferably it is selected from a range between 2 mm and 6 mm, more preferably the measure k14 is substantially 4 mm (+/−0.5 mm). Preferably, the measure k14 should be understood as the shortest linear course to the output area regions 2.
[0134] In a preferred embodiment, the torque transmission region 9 comprises a depth k11, preferably the depth is k11 is selected from a range between 3.5 mm and 10 mm, more preferably it is selected from a range between 4.5 mm and 8 mm, and most preferably the depth k11 is substantially 6.5 mm (+/−1 mm).
LIST OF REFERENCE SIGNS
[0135] 1 tool receiving device of a hand guided machine tool [0136] 2 output shaft [0137] 3 clamping device [0138] 3a clamping force [0139] 4 holding device [0140] 4a first hook means [0141] 4b second hook means [0142] 4c holding area [0143] 4d hook rotation point [0144] 4g holding device boundary area [0145] 4h holding force effect [0146] 5e guiding recess [0147] 6 moving member [0148] 8 tool device [0149] 8a tool attachment region [0150] 8b tool axis of rotation [0151] 8c first orthogonal plane [0152] 8d second orthogonal plane [0153] 8e tool encoding device [0154] 8f tool driving area region [0155] 8g axial extension of the tool driving surface area [0156] 8h tool surface point [0157] 8i tool side wall [0158] 8j operating region [0159] 8k tool connection region [0160] 9 torque transmission region [0161] 9a output area region [0162] 9b surface point [0163] 9c connecting region [0164] 9d fastening screw [0165] 9e washer [0166] 9f nut member [0167] 9g tie bar device [0168] 9h transition region (arranged between the two output area regions) [0169] 9i machine tool cover surface section [0170] 13 upper boundary plane [0171] 14 lower boundary plane [0172] 15 axial plane [0173] 16 radial plane [0174] 17 tangent plane [0175] 18 surface normal to an output area region [0176] 19 encoding device [0177] 19a elevated encoding device [0178] 19b encoding device with a recess [0179] 20a point shaped contact region [0180] 20b line shaped contact region [0181] 20c area shaped contact region [0182] 21 line of contact between the tool driving area region and the output area region [0183] 22 machine tool [0184] 22a output spindle [0185] 22b operating lever [0186] 25 reference diameter for the torque transmission region [0187] α first angle [0188] β second angle [0189] r1 first distance of the tool side wall to the tool axis of rotation [0190] r2 second distance of the tool side wall to the tool axis of rotation [0191] RI first radius of curvature of a surface area output [0192] RIa variable radius of curvature of an output area region [0193] RII second radius of curvature of an output area region [0194] a straight extending grid line of an output area region [0195] bI first curved grid line of an output surface area [0196] bII second curved grid line of an output surface area [0197] bIa third grid line with a variable curvature of an output surface area [0198] k1 key length, distance of parallel output surface areas [0199] k2 first inner diameter [0200] k3 second inner diameter [0201] k10 diameter of the recess in the machine tool cover surface section [0202] k11 depth of the torque transmission region [0203] k12 polygon angle [0204] k13 angle between the output area region and the parallel to the output shaft [0205] k14 linear progression curve of the output area region
