Bearing units for accessory tools

Abstract

The invention relates to a bearing unit for an accessory tool, in particular a disc-shaped accessory tool, for reducing the bearing notch of the accessory tool. The invention provides that the bearing unit is arranged to abut against the accessory tool and to hold the accessory tool on both sides.

Description

Technical Field

[0001] The invention relates to a bearing unit for an accessory tool, in particular a disc-shaped accessory tool. Background Art

[0002] No. 2,726,493 discloses a reducing ring for a grinding wheel, which is provided for connection with a grinding wheel in order to operate the grinding wheel on machines having different outer diameters. Summary of the invention

[0003] The object of the invention is to improve a bearing unit for an accessory tool by means of simple structural design measures.

[0004] This object is achieved by means of a bearing unit for an accessory tool, in particular a disk-shaped accessory tool, which serves to reduce the bearing recess of the accessory tool.

[0005] According to the invention, the bearing unit is provided for abutting against an accessory tool and for holding the accessory tool on both sides.

[0006] In accessory tools having a bearing recess for fastening and / or mounting on a machine, the bore diameter is adapted to the diameter of a driven unit of a machine tool, in particular a driven shaft. In order to use the accessory tool on a machine tool, accessory tools having, for example, the same properties and different bore diameters are produced for the corresponding driven shafts of the machine tool. In the case of a large number of machine tools and different driven shafts, it is uneconomical and resource-intensive to produce accessory tools for the corresponding driven shafts of the machine tool.

[0007] In order to reduce the number of approximately identical products with different bearing openings, the invention provides for the use of a bearing unit which is designed to adapt the bearing opening of a corresponding accessory tool to the output unit or to reduce the bearing opening. For environmental protection, in principle, an accessory tool with a maximum bearing opening can be provided, which is adapted to the output unit of the machine tool by means of the bearing unit.

[0008] The bearing unit allows the accessory tool to be matched particularly reliably to the machine tool, whereby, on the one hand, in particular the production costs and the required sales space can be reduced and, on the other hand, the user-friendliness can be increased.

[0009] The bearing unit is in particular designed to be reusable. Preferably, the bearing unit is designed as a bearing adapter.

[0010] Preferably, the bearing unit is designed to reduce the radial extension, in particular the diameter, of the bearing recess.

[0011] The bearing unit according to the invention can be used to prevent unwanted removal of the bearing unit when replacing an accessory tool by connecting the bearing unit to the accessory tool in such a way that the bearing unit remains on the accessory tool and / or can be separated from the accessory tool by means of a tool, such as a screwdriver.

[0012] In particular, the bearing unit according to the invention cannot be removed from the accessory tool without tools. Preferably, the bearing unit is arranged on the accessory tool and / or connected to the accessory tool in such a way that the bearing unit is secured against removal by the force of one or more fingers of a normal operator. This prevents the bearing unit from being accidentally removed from the accessory tool when the accessory tool is removed from the machine tool.

[0013] Preferably, the risk of unintentional detachability is greater when the bearing unit can be held on the attachment tool without tool detachment. When the attachment tool is assembled by guiding the driven shaft through the borehole, the bearing unit can also be prevented from accidentally falling out or at least made more difficult by the present invention.

[0014] The unnoticed loss of a bearing unit can lead to an unsafe mounting of the accessory tool on the machine tool and thus to a significant safety risk.

[0015] The bearing unit can be provided in particular as an extension, in particular an axial extension, for holding the accessory tool on both sides at the bearing notch. Preferably, the bearing unit can be provided for delimiting the bearing notch of the accessory tool. Preferably, the bearing unit can be provided for limiting the extension, in particular the axial extension, of the accessory tool. Further preferably, the bearing unit can be provided for limiting the extension, in particular the radial extension, of the accessory tool. Further preferably, the bearing unit can be provided for delimiting the bearing notch. Preferably, the bearing unit can be designed to rest directly on the accessory tool.

[0016] A “connected state” is to be understood in particular to mean a state in which the bearing unit is connected to the accessory tool.

[0017] For the purpose of better understanding, the bearing unit and the accessory tool can each have an axis which, in the connected state of the bearing unit and the accessory tool, coincide, are in particular parallel, preferably concentric. The axes each constitute a geometric axis which, for example, serves as an auxiliary axis for at least partially forming or projecting a geometric body.

[0018] The accessory tool can be configured as a grinding wheel, a grinding stone, a splitter, a grinding disc or other products that appear meaningful to a person skilled in the art.

[0019] The bearing unit can at least partially form a bearing bushing. The bearing unit can at least partially form at least one bearing flange.

[0020] “Both sides” are to be understood as meaning two sides of the accessory tool which face away from one another and which, in particular, at least in sections, define the thickness of the accessory tool.

[0021] Further expedient embodiments of the bearing unit according to the invention are described below.

[0022] It may be expedient for the bearing unit to have a radial extension which is greater than the radial extension of the bearing recess of the accessory tool. Particularly preferably, the bearing unit may be provided to cover the accessory tool, in particular on both sides. The bearing unit may be designed in particular to be C-shaped in cross section in an axial plane. In this way, in particular in the region of the bearing recess, a particularly reliable protection of the accessory tool may be provided, so that the contour and the surface delimiting the bearing recess of the accessory tool are particularly reliably protected.

[0023] Furthermore, it can be expedient if the bearing unit has an axial extension which is greater than the axial extension of the bearing recess of the accessory tool. The bearing unit can be arranged on the accessory tool in particular such that the bearing unit protrudes on both sides relative to the accessory tool. This makes it possible to support the inner surface of the accessory tool, in particular on the drive unit, which allows an optimized force transmission in order to operate the accessory tool preferably with reduced vibrations.

[0024] Furthermore, it may be expedient for the bearing unit to have a first flange-shaped section and a second flange-shaped section. The flange-shaped section may extend in a radial direction. The flange-shaped section may cover the accessory tool. The flange-shaped section may be arranged on opposite sides of the accessory tool. The flange-shaped section may limit the extension of the bearing unit in an axial direction. The first and / or second flange-shaped section may be configured to directly abut against the first and / or second side surface of the accessory tool. The flange-shaped section extends in a radial direction. The flange-shaped section may be configured to abut against the accessory tool in a manner of the entire surface. The flange-shaped section may be configured as a bearing flange. The two flange-shaped sections may be connected to each other by means of a cylindrical section in at least one operating state, in particular in an operating state in which the bearing unit is running on the accessory tool. As a result, the bearing unit may be particularly reliably connected to the accessory tool.

[0025] Furthermore, it can be expedient for the bearing unit to have a first and / or second cylindrical section. The first and / or second cylindrical section can be provided to delimit the bearing notch. The first and / or second cylindrical section can have an inner side, in particular an inner side with an inner surface, which is provided to delimit the bearing notch. The first and / or second cylindrical section can have an outer side, in particular an outer side with an outer surface, which is provided to abut against or be supported on an accessory tool. The cylindrical section can be designed as a bearing bushing. As a result, the bearing unit can be held particularly reliably on the bearing unit.

[0026] The invention proposes that the cylindrical section protrudes by a distance (t) on the side of the accessory tool facing away from the flange-shaped section in the connected state. The distance can be greater than 1 mm, preferably greater than 2 mm, and more preferably greater than 3 mm. As a result, the bearing unit can be used on accessory tools with different thicknesses. As a result, resources can be saved.

[0027] Furthermore, it is proposed that the first and / or second cylindrical section is formed in one piece with the first and / or second flange-shaped section. This ensures that the bearing unit cannot be accidentally disassembled.

[0028] It is further proposed that the bearing unit is constructed in one piece. The two flange-shaped sections can in particular be constructed in one piece. Preferably, the bearing unit can be made of plastic. As a result, the bearing unit can be particularly flexible and reusable.

[0029] It can be expedient for the bearing unit to have a first bearing element and a second bearing element, which are connected to each other, in particular force-locked, form-locked and / or material-locked. The first bearing element can be composed of a first flange-shaped section and a first cylindrical section. The second bearing element can be composed of a second flange-shaped section and a second cylindrical section. The first bearing element can be composed of plastic in particular. Preferably, the second bearing element can be composed of metal. The bearing unit, in particular the first and / or second bearing element, can be configured as a circular arc segment or an annular shape. As a result, the bearing unit can be connected to the machine tool in a particularly reliable and tolerance-optimized manner.

[0030] Furthermore, it can be expedient for the bearing unit, in particular the first bearing element and / or the second bearing element, to be arranged in the bearing recess of the accessory tool in such a way that a clearance fit is produced, thereby ensuring that, for example, when the first bearing element is disassembled, the second bearing element does not remain in the bearing recess.

[0031] Furthermore, it can be expedient for the second bearing element to be connectable to the first bearing element, in particular to be insertable, in such a way that the second bearing element expands the first bearing element in such a way that the first bearing element can be connected to the accessory tool in a force-locking manner. Thus, the first bearing element can, for example, preload the second bearing element in such a way that the bearing unit can be held on the accessory.

[0032] In addition, it can be in accordance with the purpose that the bearing unit, in particular the first bearing element, has a radially inwardly protruding protrusion. The protrusion can be arranged in the radial direction on the side of the bearing unit, in particular the first bearing element, facing away from the bearing flange. The protrusion can be set to limit the minimum radial extension of the bearing unit. The protrusion can be set to center the bearing unit and / or the accessory tool on the machine tool during the receiving process. The protrusion can have a chamfer, in particular a centering chamfer. The protrusion can limit the locking groove in the axial direction in particular. The protrusion can be set as a stop for the second bearing element, in particular the second bearing bushing. The protrusion can determine the receiving position of the second bearing element. The protrusion can be constructed in such a way that the protrusion prevents the bearing unit, in particular the second bearing element, from being accidentally loosened or disassembled relative to the first bearing element during the receiving process of the bearing unit and / or the accessory tool on the machine tool. "Receiving process" should be understood as a process in which the bearing unit and / or the accessory tool are received on the machine tool. The projection can extend in the radial direction in such a way that it at least partially grips the second bearing element, in particular the bearing sleeve of the second bearing element. Thus, during the receiving process of the bearing unit on the handheld power tool and the corresponding insertion process, it can be prevented that, for example, the output shaft of the handheld power tool acts on the second bearing element and pulls the second bearing element off the accessory tool.

[0033] Furthermore, it can be expedient for the bearing unit to be designed as a circular ring. The bearing unit can be designed in particular to be C-shaped in a radial plane. This allows a particularly reliable force distribution to be achieved.

[0034] The present invention proposes that the bearing unit is constructed in the shape of a circular arc segment. The bearing unit, in particular the bearing element, extends around most of the periphery in an axial plane. The bearing unit, in particular at least one bearing element, extends around the axis of the bearing unit in an axial plane by more than 240°, in particular more than 270°, preferably more than 300°, further preferably more than 315°, and particularly preferably more than 330°. The bearing unit, in particular at least one bearing element, extends around the axis of the bearing unit in an axial plane by less than 355°, in particular less than 330°, preferably less than 300°, and further preferably less than 270°. As a result, the bearing unit can be removed in a particularly advantageous and non-destructive manner.

[0035] Furthermore, it is proposed that the bearing unit, in particular the bearing element, has a lower engagement recess. The lower engagement recess is provided for loosening or separating the bearing unit, in particular the bearing element, from an accessory tool. In order to loosen or separate the bearing unit from the accessory tool, a tool, such as a screwdriver, can be engaged in the lower engagement recess, for example, in order to pry the bearing unit out of the bearing notch. As a result, the bearing unit can be disassembled in a particularly advantageous manner, for example, by means of a tool thereof.

[0036] The lower engagement groove can be designed as a bulge, which forms a cavity between the bearing unit and the accessory tool. The cavity can be delimited by the bearing unit and the accessory tool.

[0037] The invention further relates to a system comprising an accessory tool and a bearing unit received on the accessory tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Further advantages are derived from the following description of the drawings. Embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain features in a plurality of combinations. It will also be appropriate for a person skilled in the art to consider the features individually and combine them into other meaningful combinations. Here is shown:

[0039] Figure 1 A view of an exemplary accessory tool with an exemplary bearing unit,

[0040] FIG. 2 is a perspective view of a bearing unit according to the invention consisting of a bottom view and a top view and a cross-sectional view of the bearing unit,

[0041] 3 shows a perspective view of a further development of a bearing unit according to the invention, from a bottom view, and a sectional view of the bearing unit.

[0042] In the following figures, identical components are provided with the same reference numerals. DETAILED DESCRIPTION

[0043] The drawing relates to an accessory tool 11 designed as a dividing disc for dividing workpieces. The dividing disc can be used universally and is particularly suitable for processing workpieces made of cellulose, such as grass, bushes or roots, wood, plastic or composites. Alternatively, the dividing disc can also be suitable for processing, for example, metal, rock or composites. However, the invention is not limited to dividing discs, but can also be used in other accessory tools 11 that appear to be sensible to the person skilled in the art, such as grinding wheels, grinding stones and / or diamond discs.

[0044] The accessory tool 11 is provided for detachable reception on a rotationally driven, commercially available machine tool (not shown). The accessory tool 11 can be received in a receiving device known to a person skilled in the art and designed to receive the accessory tool 11, in particular in a receiving device of an output unit of a machine tool, in particular a handheld machine tool, with a rotational and / or translational working motion acting on a workpiece to be machined. For example, a translational feed can be introduced into the tool, in which the operator of the machine tool exerts a force on the machine tool, in particular on the machine tool housing.

[0045] Here, not only fixed machine tools, such as table circular saws corresponding to application DE 102010042016 or US 2062969 A, but also mobile machine tools, such as hand-held circular saws corresponding to application DE 3740200 A1 or backpack-type free cutters corresponding to application DE 19616764 A1 are suitable as machine tools. Alternatively, hand-held circular saws or angle grinders are also suitable.

[0046] Figure 1 A disk-shaped accessory tool 11 with a bearing unit 13 is shown. The accessory tool 11 is designed as a saw blade and has a plurality of cutting teeth 15 on the circumference. The cutting teeth 15 are provided to form a cutting edge in a rotational movement about the rotation axis Ra of the accessory tool 11, by means of which a workpiece can be machined. Alternatively or additionally, the accessory tool 11 can be designed as a grinding wheel, a grinding stone, a split disc, a grinding disc or another product that appears to be appropriate to a person skilled in the art.

[0047] The accessory tool 11 has a bearing recess 17 for fastening and / or mounting on a machine tool. The bearing recess 17 is designed as a bore diameter and is matched to the diameter of the output shaft of the machine tool output unit. The bearing recess 17 is circular.

[0048] In order to use the accessory tool 11 on a driven shaft having, for example, a smaller diameter than the bore diameter of the bearing slot 17, the bearing slot 17 can be reduced by means of a bearing unit 13. The bearing unit 13 is provided for being inserted into the bearing slot 17 in order to reduce the bearing slot at least partially in diameter. As a result, the bearing unit 13 can be designed to be reusable. The bearing unit 13 is configured as a bearing adapter. The bearing unit 13 is provided for being adjacent to the accessory tool 11 and for holding the accessory tool 11 on both sides (FIG. 2).

[0049] The bearing unit 13 is arranged on the accessory tool 11 and / or is connected to the accessory tool in such a way that the bearing unit 13 is secured against removal by the action of force of one or more fingers of a normal operator.

[0050] The bearing unit 13 is provided for holding the axial extension of the accessory tool 11 on both sides at the bearing slot 17. The bearing unit 13 is provided for delimiting the bearing slot 17 of the accessory tool 11. The bearing unit 13 is provided for limiting the axial extension of the accessory tool 11. The bearing unit 13 is provided for limiting the radial extension of the accessory tool 11. The bearing unit 13 is designed for direct contact with the accessory tool 11.

[0051] The bearing unit 13 and the bearing slot 17 of the accessory tool 11 can be arranged coaxially relative to each other. The bearing unit 13 is arranged at least in sections in the bearing slot 17. The bearing slot 17 can extend at least in sections in the axial plane Ae relative to the accessory axis Za of the accessory tool 11, which is configured as the rotation axis Ra, around the bearing unit 13. The bearing unit 13 can have a bearing axis La, and the accessory tool 11 can have an accessory axis Za, which coincide in the connected state of the bearing unit 13 and the accessory tool 11.

[0052] The bearing unit 13 has at least in sections a bearing bushing 21 and at least in sections a first bearing flange 23a and a second bearing flange 23b. The bearing flanges 23a, 23b extend around the bearing bushing 21. The bearing flanges 23a, 23b extend in the radial direction. The bearing unit 13 is configured as a C-shape in the radial plane Re in a sectional view ( Figure 2c , 3b ). The bearing flanges 23a, 23b limit the radial extension of the bearing unit 13. The bearing flanges 23a, 23b delimit the bearing bushing 21. The bearing flanges 23a, 23b are arranged on the sides of the bearing bushing 21 facing away from each other. The bearing flanges 23a, 23b protrude relative to the accessory tool 11 in the radial direction of the accessory axis Za. The first bearing flange 23a abuts against the first side surface 25 of the accessory tool 11. The second bearing flange 23b abuts against the second side surface 27 of the accessory tool 11 facing away from the first side surface 25. The first side surface 25 and the second side surface 27 of the accessory tool 11 form the strength or thickness D of the accessory tool 11 at least in the area around the bearing notch 17.

[0053] The bearing flanges 23a, 23b each have a radial extension which is greater than the radial extension of the bearing recess 17 of the accessory tool 11. The bearing flanges 23a, 23b are provided for covering the accessory tool 11 on both sides. The bearing unit 13 is c-shaped in cross section along the axial plane Ae.

[0054] The bearing unit 13, in particular the bearing flanges 23a, 23b, has an axial extension which is greater than the axial extension of the bearing recess 17 of the accessory tool 11. The bearing flanges 23a, 23b are arranged on the accessory tool 11 such that the bearing unit 13 protrudes on both sides relative to the accessory tool 11. The bearing flanges 23a, 23b each have an inner surface 29, 31 which bears against the side surfaces 25, 27 of the accessory tool 11. The bearing flanges 23a, 23b are provided for bearing against the accessory tool 11 over the entire surface.

[0055] The two bearing flanges 23a, 23b are connected to one another in at least one operating state, in particular in an operating state in which the bearing unit 13 is operated on the accessory tool 11, by means of a bearing bushing 21. The bearing bushing 21 is provided for connecting the bearing flanges 23a, 23b to one another.

[0056] The bearing bushing 21 and the two bearing flanges 23a, 23b are designed as one piece (FIG. 2). The bearing bushing 21 is formed by a cylindrical section of the bearing unit 13, which delimits the bearing notch 17. The cylindrical section has an inner side with an inner surface 33, which is provided for delimiting the bearing notch 17. The cylindrical section has an outer side with an outer surface 35, which is provided for abutting against the accessory tool 11 or for being supported on the accessory tool. In this case, the bearing unit 13 is made of a material.

[0057] The bearing unit 13 is constructed as a one-piece. The bearing unit 13 is constructed in the shape of a circular arc segment. The bearing unit 13 extends more than 300° and less than 355°, for example 350°, around the axis of the bearing unit 13 in the axial plane Ae. The bearing unit 13 extends in a c-shaped manner in the radial plane Re. Here, the bearing unit 13 has a first end 37 and a second end 39 opposite to the first end 37. The two ends 37, 39 limit the extension scale of the bearing unit 13. The two ends 37, 39 are constructed so as to be spaced apart from each other that one of the ends 37, 39 can be pivoted in the direction of the bearing axis La, for example, so that the end 37 does not contact the opposite end 39. As a result, the bearing unit 13 can be pulled out of the bearing slot 17 in a particularly simple manner by pulling one of the ends 37, 39.

[0058] Furthermore, the bearing unit 13 has two lower engagement grooves 41. The lower engagement grooves 41 are arranged on the ends 37, 39 of the bearing unit 13. The lower engagement grooves 41 are provided for removing or separating the bearing unit 13 from the accessory tool 11 by means of a tool, such as a screwdriver, in that a screwdriver engages in the lower engagement grooves 41 in order to pry the bearing unit 13 out of the bearing notch 17.

[0059] The lower engagement groove 41 is designed as a bulge, which forms a cavity 43 between the bearing unit 13 or the bearing flanges 23a, 23b and the accessory tool 11. The cavity 43 is bounded by the bearing flanges 23a, 23b, the bearing bushing 21 and the accessory tool 11. The lower engagement groove 41 is formed by a local increase in the bearing flange 23.

[0060] The bearing unit 13 can be constructed in two parts. The bearing unit 13 is constructed in a circular ring shape. The bearing unit 13 can have two bearing elements 51, 53, which respectively have bearing flanges 23a, 23b and bearing bushings 21a, 21b (Figure 3). The first bearing element 51 has a first bearing bushing 21a and a first bearing flange 23a constructed as one piece. The second bearing element 53 has a second bearing bushing 21b and a second bearing flange 23b constructed as one piece. The first bearing element 51 is made of plastic. The second bearing element 53 is made of metal.

[0061] The bearing bushings 21a, 21b and the bearing flanges 23a, 23b are designed at least substantially similarly to the bearing bushings 21 and the bearing flanges 23a, 23b of the bearing unit 13 designed as one piece ( Figures 2a to 2c ). The bearing unit 13 has a first and a second bearing bushing 21a, 21b. The first and the second bearing bushing 21a, 21b are provided for delimiting the bearing slot 17. Similar to FIG. 2 , the first bearing bushing 21a has an outer side with an outer surface, which is provided for delimiting the bearing slot 17. Similar to FIG. 2 , the second bearing bushing 21b has an inner side with an inner surface, which is provided for abutting against the accessory tool 11 or being supported on the accessory tool.

[0062] The bearing elements 51 , 53 , in particular the bearing bushings 21 a , 21 b of the bearing elements 51 , 53 , interact with one another in the connected state and form the bearing unit 13 .

[0063] The first bearing bushing 21a and the second bearing bushing 21b are connected to each other in a force-locking and / or form-locking manner. In the case of a form-locking connection, the second bearing bushing 21b of the second bearing element 53 can be connected to the first bearing bushing 21a of the first bearing element 51. The form-locking connection can be achieved by means of a latching connection 57. The second bearing bushing 21b has a latching protrusion 59 on the side of the second bearing element 53 that faces away from the second bearing flange 23b. The first bearing bushing 21a has a latching groove 61 on the side facing the first bearing flange 23a. The latching protrusion 59 is configured as a latching heightened portion extending in the radial direction of the bearing axis La. The latching groove 61 is configured as a latching recessed portion extending in the radial direction of the bearing axis La. The latching protrusion 59 is configured to be embedded in the latching groove 61 and secure the bearing elements 51, 53 to prevent axial movement.

[0064] In the case of a force-locking connection, the first bearing element 51 is arranged in the bearing recess 17 of the accessory tool 11 in such a way that a clearance fit is produced, thereby ensuring that, for example, the first bearing element 51 is not held in the bearing recess 17 when the second bearing element 53 is removed. As a result, the second bearing element 53 can be connected to the first bearing element 51, in particular can be inserted, in such a way that the second bearing element 53 expands the first bearing element 51 in such a way that the first bearing element 51 is held in the bearing recess 17 with the accessory tool 11 in a force-locking manner. As a result, the second bearing element 53 can, for example, preload the first bearing element 51 in such a way that the bearing unit 13 is held on the accessory tool 11.

[0065] In the connected state, the second bearing bushing 21b protrudes by a distance t on the side of the accessory tool 11 facing away from the bearing flanges 23a, 23b. This distance can be greater than 1 mm, preferably greater than 2 mm, more preferably greater than 3 mm. As a result, the bearing unit 13 can be used on accessory tools 11 of different thicknesses.

[0066] The first bearing element 51 has three lower engagement grooves 41. These lower engagement grooves 41 are designed similarly to the lower engagement grooves 41 in FIG.

[0067] The first bearing element 51 has a protrusion 81 protruding radially inward. The protrusion 81 is arranged on the side of the first bearing element 51 facing away from the bearing flange 23a in the radial direction. The protrusion 81 is provided to limit the minimum radial extension of the bearing unit 13. The protrusion 81 is provided to center the bearing unit 13 and / or the accessory tool 11 on the machine tool during the receiving process. The protrusion 81 has a chamfer 83 configured as a centering chamfer. The protrusion 81 delimits the locking groove in the axial direction. The protrusion 81 can be provided as a stop for the second bearing bushing 21b of the second bearing element 53. The protrusion 81 determines the receiving position of the second bearing element 53. The protrusion 81 is configured in such a way that the protrusion 81 prevents the second bearing element 53 from being unintentionally loosened relative to the first bearing element 51 during the receiving process of the bearing unit 13 and / or the accessory tool 11 on the machine tool. The projection 81 can extend in the radial direction in such a way that the projection 81 at least partially grips the bearing sleeve 21b of the second bearing element 53. Thus, during the receiving process and the corresponding insertion process of the bearing unit 13 on the machine tool, it can be prevented that, for example, the output shaft of the machine tool acts on the second bearing element 53 and pulls it off the accessory tool 11.

Claims

1. A bearing unit for an accessory tool (11), the bearing unit being used to reduce a bearing notch (17) of the accessory tool (11), characterized in that: The bearing unit (13) is configured to be adjacent to the accessory tool (11) and to hold the accessory tool (11) on both sides, wherein the bearing unit (13) has a first bearing element (51) and a second bearing element (53), the first bearing element and the second bearing element being connected to each other, wherein the second bearing element (53) can be connected to the first bearing element (51) in such a way that the second bearing element (53) expands the first bearing element (51) in such a way that the first bearing element (51) can be connected to the accessory tool (11) in a force-locking manner.

2. The bearing unit according to claim 1, characterized in that: The bearing unit (13) has a radial extension which is greater than the radial extension of the bearing slot (17) of the accessory tool (11).

3. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) has an axial extension which is greater than the axial extension of the bearing slot (17) of the accessory tool (11).

4. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) has a first flange-shaped section and a second flange-shaped section.

5. The bearing unit according to claim 4, characterized in that: The bearing unit (13) has a first cylindrical section and / or a second cylindrical section.

6. The bearing unit according to claim 5, characterized in that In the connected state, the first cylindrical section and / or the second cylindrical section protrudes by a distance (t) on a side of the accessory tool (11) facing away from the respective flange-shaped section.

7. The bearing unit according to claim 5, characterized in that: The first cylindrical section and / or the second cylindrical section are formed integrally with the first flange-shaped section and / or the second flange-shaped section.

8. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) has a lower embedding groove (41).

9. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) is arranged in the bearing recess (17) of the accessory tool (11) in such a way that a clearance fit is produced.

10. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) has a protrusion (81) protruding radially inward.

11. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) is configured in the shape of a circular ring.

12. The bearing unit according to claim 1 or 2, characterized in that: The bearing unit (13) is configured in the shape of a circular arc segment.

13. The bearing unit according to claim 8, characterized in that The first bearing element (51) and / or the second bearing element (53) has the lower embedding groove (41).

14. The bearing unit according to claim 1, characterized in that The accessory tool (11) is a disc-shaped accessory tool.

15. The bearing unit according to claim 1, characterized in that The first bearing element and the second bearing element are connected to one another in a force-fitting, form-fitting and / or material-fitting manner.

16. The bearing unit according to claim 1, characterized in that The first bearing element (51) and / or the second bearing element (53) are arranged in the bearing recess (17) of the accessory tool (11) in such a way that a clearance fit is produced.

17. The bearing unit according to claim 1, characterized in that The second bearing element (53) can be inserted into the first bearing element (51) in such a way that the second bearing element (53) expands the first bearing element (51) in such a way that the first bearing element (51) can be connected to the accessory tool (11) in a non-positive manner.

18. The bearing unit according to claim 1, characterized in that The first bearing element (51) has a protrusion (81) protruding radially inwardly.

19. A system comprising an accessory tool (11) and a bearing unit (13) received on the accessory tool (11), characterized in that The bearing unit is a bearing unit (13) according to any one of claims 1 to 18.

Images