Grinding machine with a cooling air wheel

Abstract

The invention relates to a grinding machine (11) having a machine housing (15) and a drive motor (12), in particular an electric drive motor, positioned in the machine housing (15) for the rotary and / or oscillatory driving of a tool receptacle (14) to which a disk tool (90) can be detachably fastened, wherein the drive motor (12) has a motor shaft (12C), which is mounted on at least one motor bearing (12E) so as to be rotatable with respect to the machine housing (15) about a motor axis (M), and a cooling air wheel (60), which has a holding portion (64) by means of which the cooling air wheel (60) is coupled in movement, or connected for conjoint rotation, to the motor shaft (12C) of the drive motor (12), wherein the cooling air wheel (60) is positioned between a stator (12A) of the drive motor (12) and the tool receptacle (14), wherein the cooling air wheel (60) has a fan portion (61) having a directional component that is parallel to the motor axis (M), and having fan blades (63) for generating a cooling air flow. According to the invention, the cooling air wheel (60) has, on its side facing away from the stator (12A) of the drive motor (12), between the fan blades (63) of the fan portion (61) and the holding portion (64), a cooling air wheel receiving space (67) which extends at a radial distance from the motor axis (M) around a shaft receptacle (65), provided on the holding portion (64), of the cooling air wheel (60) for the motor shaft (12C) or around a shaft body connected for conjoint rotation to the motor shaft (12C), wherein a component held in a stationary manner on the machine housing (15) and / or a drive component which is or can be driven by the drive motor (12) and is positioned between the cooling air wheel (60) and the tool receptacle (14) engages in the cooling air wheel receiving space (67).

Description

[0001] Grinding machine with a cooling air wheel

[0002] The invention relates to a grinding machine with a machine housing and a drive motor, in particular an electric one, arranged in the machine housing for rotating and / or oscillatingly driving a tool holder to which a disk tool can be detachably fastened, wherein the drive motor has a motor shaft mounted on at least one motor bearing so as to be rotatable about a motor axis with respect to the machine housing and a cooling air wheel which has a holding section by means of which the cooling air wheel is motion-coupled or rotationally fixedly connected to the motor shaft of the drive motor, wherein the cooling air wheel is arranged between a stator of the drive motor and the tool holder, wherein the cooling air wheel has a fan section extending with a directional component parallel to the motor axis and having fan blades for generating a cooling air flow.

[0003] Such a grinding machine is described, for example, in DE 10 2015 121 305 A1. The known grinding machine comprises a tool holder and a disc tool. A fan wheel is arranged between the tool holder and the drive motor. A motor bearing for supporting the motor shaft is provided between the tool holder and the drive motor.

[0004] Although the well-known sander is relatively compact and low-profile, it is advantageous to have a vacuum cleaner for dust removal from the sander.

[0005] Further grinding machines are described in DE 196 29 989 C2 and DE 199 63 831 A1. Based on this, the object of the present invention is to provide an improved grinding machine, in particular a grinding machine with a compact design.

[0006] To achieve the object, in a grinding machine of the type mentioned at the outset, it is provided that the cooling air wheel has, on its side facing away from the stator of the drive motor, a cooling air wheel receiving space between the fan blades of the fan section and the holding section, which cooling air wheel receiving space extends at a radial distance with respect to the motor axis around a shaft receiving space of the cooling air wheel for the motor shaft provided on the holding section or around a shaft body connected to the motor shaft in a rotationally fixed manner, wherein a component held stationary on the machine housing and / or a drive component driven or drivable by the drive motor, which is arranged between the cooling air wheel and the tool holder, engages in the cooling air wheel receiving space.

[0007] The cooling air wheel receiving space is preferably annular and / or advantageously extends in a ring shape, in particular in a circular ring shape, around the motor shaft and / or the holding section.

[0008] The cooling air wheel receiving chamber forms a component of the cooling air wheel.

[0009] The cooling air wheel receiving space is arranged on the cooling air wheel, in particular on a front side of the cooling air wheel and / or on the side of the cooling air wheel through which a rotational axis of the cooling air wheel passes.

[0010] The cooling air wheel receiving space and the stator of the drive motor are preferably arranged on opposite sides of the cooling air wheel.

[0011] The shaft mount is designed, for example, as a through-hole through which the motor shaft passes or can pass. A holder, such as a clamp holder, for holding the motor shaft can be arranged in the shaft mount. The motor shaft is preferably held in a clamp fit. The drive motor preferably drives the tool holder directly or via a gear and / or an eccentric bearing. Thus, the motor shaft can be connected to the tool holder in a rotationally fixed manner or can drive the tool holder via a gear or eccentric bearing.

[0012] The drive component driven or drivable by the drive motor, which engages in the cooling air wheel receiving space, is preferably a drive component different from the motor shaft and / or is movable relative to the motor shaft.

[0013] The cooling air wheel has a cooling air wheel receiving space facing the tool holder and / or facing away from the drive motor, which is provided and designed to receive further components, for example the tool holder or a connection between the tool holder and the cooling air wheel, in particular its connection to the motor shaft.

[0014] For example, the cooling air wheel has a bell shape or a truncated cone shape, by means of which the cooling air wheel forms the cooling air wheel receiving space on its side facing away from the drive motor and / or opposite to the drive motor and / or on its side facing the tool holder.

[0015] The holding section serves, for example, to non-rotatably hold the cooling air wheel on the motor shaft or to non-rotatably hold it on a component that is non-rotatably connected to the motor shaft. The component can, for example, be a receiving element for a gear and / or an eccentric bearing, which is arranged between the output of the drive motor and the tool holder.

[0016] The component fixedly mounted on the machine housing preferably comprises a cover that completely or partially closes a motor housing in which the drive motor is mounted. For example, the cover serves to hold or support the drive motor in the motor housing. The cover can seal the motor housing tightly or hermetically. However, it is also possible for the cover to be permeable to air, for example, for cooling air intended for cooling the drive motor, or to allow air or cooling air to pass through.

[0017] The cover can close the engine compartment on its own. However, it is also possible for another component, such as an air duct element, a cover body, an air duct wall, or the like, to close the engine compartment together with the cover.

[0018] No motor bearing can be arranged on the cover to support the rotation of the motor shaft relative to the machine housing.

[0019] In an advantageous embodiment, the cover can have a locking function for closing the motor accommodation space and / or a stiffening or reinforcement of the machine housing.

[0020] It is possible that the cover does not completely seal the engine compartment, but only partially or essentially seals it. Other components may also be provided for sealing in addition to the cover.

[0021] It is possible, for example, for the cover to form or comprise an air guide body. Guide contours for guiding or directing air, in particular cooling air, can be provided on the cover.

[0022] Advantageously, the grinding machine has a dust removal chamber in which the tool holder is arranged, wherein the dust removal chamber is provided and configured to extract dust from the disc tool. Dust can be extracted from the dust removal chamber when the disc tool is arranged on the tool holder and a workpiece is being machined with the grinding machine.

[0023] It is advantageous if the cover separates the motor housing from the dust removal chamber, in which the tool holder, in particular also at least a portion of the disc tool, is arranged and accommodated. When the disc tool is attached to the tool holder, it engages at least partially in the dust removal chamber.

[0024] The grinding machine preferably has a seal for engagement with the disc tool. The dust removal chamber is defined, for example, by the seal, which at least partially engages a side of the disc tool facing the machine housing of the grinding machine when the disc tool is attached to the tool holder.

[0025] For example, the cover is designed as a kind of bulkhead or closure wall so that dust that occurs, for example, in the area of ​​the tool holder when machining a workpiece using the grinding machine does not penetrate into the motor housing space or is at least prevented from doing so.

[0026] The cover is preferably designed and intended to close the engine compartment dust-tight.

[0027] It is advantageous if the component fixedly mounted on the machine housing comprises or is formed by a bearing support with a bearing receptacle for holding the at least one motor bearing. The bearing support is firmly connected to the machine housing, for example, held in a form-fitting manner and / or screwed, or is, for example, part of the machine housing.

[0028] Preferably, the bearing support is or forms a structural unit that is separate from the machine housing. Thus, the bearing support can be mounted on the machine housing, for example, by screwing it or the like. It is advantageous if the machine housing and the bearing support have matching, form-fitting contours, for example, a receiving recess on the machine housing in which the bearing support can be held in a form-fitting manner.

[0029] The bearing bracket is firmly connected to the machine housing, for example held in a form-fitting manner and / or in particular detachably held or fastened by means of fastening means, in particular screwed and / or riveted and / or adhesively bonded to the machine housing. The fastening means comprise, for example, screws, screw receptacles, through-openings for screws, rivets, adhesive or the like. The bearing bracket can also be connected to the machine housing in a clamp fit. In this embodiment, for example, clamping contours are provided on the bearing bracket and machine housing for clamping the bearing bracket to the machine housing. Through-openings for screws and / or screw receptacles can be provided on the bearing bracket and / or machine housing in order to screw the bearing bracket to the machine housing.

[0030] The bearing support preferably has a projection through which the motor axis extends, which projects into or engages the interior of the machine housing. For example, the bearing support is dome-shaped or has a dome that engages the machine housing. The bearing support for the motor bearing is arranged on the projection, particularly its free end area.

[0031] The bearing support preferably has an outer peripheral edge or outer peripheral edge region, which has an outer peripheral wall and from which the particularly dome-like projection protrudes. The outer peripheral wall is aligned, for example, with a portion of the machine housing that is located directly adjacent to the outer peripheral wall when the bearing support is mounted on the machine housing. The outer peripheral edge region is preferably located outside the machine housing when the bearing support is attached to the machine housing.

[0032] The outer peripheral edge region and the projection of the bearing support, in particular the dome, have longitudinal extensions extending parallel to the motor axis, wherein the longitudinal extension of the projection is greater, in particular preferably at least twice as large, preferably at least 2.5 times or approximately 2.5 times as large, more preferably at least three times as large, than the longitudinal extension of the outer peripheral edge region. In relation to the overall height or height of the grinding machine starting from the tool holder or the disk tool, the respective longitudinal extension could also be referred to as the vertical extension.

[0033] The projection of the bearing support is preferably entirely or at least substantially, for example, at least 80% or 90% of its longitudinal length parallel to the motor axis, accommodated in the cooling air wheel arranged between the bearing support and the drive motor. Preferably, the outer peripheral wall region is arranged outside this cooling air wheel.

[0034] The bearing carrier can, for example, form the aforementioned cover or have the cover.

[0035] Mounting the drive motor in the motor housing is possible, for example, via a mounting opening located opposite the bearing support and / or the cover, with the motor housing extending between the mounting opening and the bearing support. The mounting opening is preferably closable or is closed by a housing cover.

[0036] It is possible, for example, that the cover or the bearing support, particularly if the cover or bearing support forms part of the machine housing, protrudes radially inwards in the direction of the motor shaft in the manner of a collar.

[0037] The cover or bearing carrier protrudes, so to speak, from an outer circumference of the cooling air wheel into its cooling air wheel receiving space.

[0038] Advantageously, the at least one drive component engaging in the cooling air wheel receiving space comprises or is formed by the at least one motor bearing. The cooling air wheel receiving space enables the motor bearing arranged closer to the tool holder or between the tool holder and the stator of the drive motor to be arranged on a side of the motor shaft facing away from the stator within the cooling air wheel receiving space. The bearing holder arranged on the cover or bearing carrier is arranged at least partially or entirely within the cooling air wheel receiving space. Thus, the motor bearing can also be arranged entirely or partially in the cooling air wheel receiving space.

[0039] The at least one engine bearing arranged in the cooling air wheel receiving space is preferably arranged between, on the one hand, the holding section of the cooling air wheel and, on the other hand, the gear or eccentric bearing.

[0040] The at least one drive component engaging in the cooling air wheel receiving space advantageously comprises or is formed by a gear and / or an eccentric bearing for driving the tool holder. Thus, it is possible for the gear and / or the eccentric bearing to be arranged entirely or partially in the cooling air wheel receiving space.

[0041] The motor shaft or a receiving element arranged on the motor shaft in a rotationally fixed manner preferably has a receptacle for the gear and / or the eccentric bearing. The receiving element is arranged, for example, on a side of the motor shaft facing away from the drive motor or on a longitudinal end region of the motor shaft facing away from the drive motor.

[0042] The receptacle for the gear or eccentric bearing is preferably accommodated entirely or partially in the cooling air wheel receiving space. For example, the receptacle may have a bell shape or a trough shape. The receptacle may, for example, form or include a bearing receptacle for the eccentric bearing and / or for holding the eccentric bearing.

[0043] The bearing support advantageously engages in the cooling air wheel receiving space or protrudes parallel to the motor axis into the cooling air wheel receiving space. For example, the bearing support can have a support structure for supporting and holding the motor bearing, which support structure engages in the cooling air wheel receiving space. The support structure can, for example, be a so-called open structure, for example formed by discrete and spaced-apart struts and / or supports, or can have such struts or supports. However, the support structure can also advantageously be a closed or wall-like support structure. The support structure is preferably formed by a wall body or has a wall section or wall body.

[0044] The support structure is advantageously bell-shaped or dome-shaped.

[0045] It is advantageous if the bearing carrier engages into the cooling air wheel receiving space to at least 20%, preferably to at least 30%, even more preferably to at least 50% or at least 60% of its longitudinal extent parallel to the motor axis and / or parallel to the motor axis.

[0046] The at least one drive component engaging in the cooling air wheel receiving space and / or the bearing support receiving space can also comprise or be formed by a dust air wheel for generating a dust air flow, wherein, by means of the dust air wheel, dust generated during the machining of a workpiece by the grinding machine can be conveyed away from the tool holder and / or the or a disc tool arranged on the tool holder.

[0047] The dust air wheel is arranged, for example, in the aforementioned dust removal chamber.

[0048] A type of sandwich construction or layered construction is advantageous, in which the cover or the bearing carrier is arranged between the cooling air wheel and the dust air wheel.

[0049] The dust-air wheel is preferably rigidly connected to the motor shaft or coupled to a rotary drive. The dust-air wheel can, for example, be arranged and / or held on the aforementioned receiving element, which is rigidly connected to the motor shaft.

[0050] The dust-absorbing air wheel advantageously has a dust-absorbing air wheel receiving space for the gear and / or the eccentric bearing. The dust-absorbing air wheel receiving space is advantageously arranged in the cooling air wheel receiving space and / or the bearing support receiving space. The dust-absorbing air wheel receiving space is preferably open toward the tool holder and / or in the direction of the tool holder and / or in a direction opposite to the drive motor.

[0051] It is advantageous if the at least one drive component engaging in the cooling air wheel receiving space and / or the bearing support receiving space and / or the dust air wheel receiving space comprises or is formed by a gear and / or an eccentric bearing for driving the tool holder.

[0052] It can be provided that at least two receiving spaces of the cooling air wheel receiving space and / or the bearing support receiving space and / or the dust-extracting air wheel receiving space at least partially engage with one another. In this case, a respective receiving space can be entirely accommodated in another receiving space or can only extend partially into the other receiving space. In the receiving space accommodating another receiving space, for example, a contour or partition wall delimiting the accommodated receiving space can also be arranged. For example, the bearing support receiving space and / or the dust-extracting air wheel receiving space is arranged in the cooling air wheel receiving space. Opposite boundary contours of the respective receiving spaces delimiting a respective receiving space, for example walls, narrow sides of fan wheels or the like, which engage with one another, preferably have matching geometries and / or geometric profiles.The boundary contours are preferably located directly opposite each other.

[0053] It is possible for at least one receiving space of the cooling air wheel receiving space, the bearing support receiving space, and the dust air wheel receiving space to be arranged entirely or partially in another receiving space of the cooling air wheel receiving space, the bearing support receiving space, and the dust air wheel receiving space, or to have a common intersection surface with this other receiving space. For example, a section of the dust air wheel receiving space facing the drive motor can extend into the bearing support receiving space. Both the section of the dust air wheel receiving space and a section of the bearing support receiving space that receives it can extend into the cooling air wheel receiving space. All receiving spaces can therefore have regions in a common intersection plane or intersection surface.

[0054] At least two components of the cooling air wheel, bearing support and dust air wheel preferably have sections, in particular annular sections, in a common sectional plane through which the motor axis passes vertically.

[0055] Advantageously, a receptacle for the gear or the eccentric bearing is accommodated at least partially or entirely in the cooling air wheel receptacle space and / or the bearing support receptacle space and / or the dust air wheel receptacle space, wherein the receptacle is arranged on the motor shaft or a receptacle element arranged on the motor shaft in a rotationally fixed manner. An exemplary configuration can provide that the receptacle is at least partially arranged in the dust air wheel receptacle space, and the dust air wheel receptacle space is in turn at least partially accommodated in the bearing support receptacle space, wherein the bearing support receptacle space is at least partially accommodated in the cooling air wheel receptacle space.

[0056] Fan blades are arranged on the fan section of the cooling air wheel to generate the cooling air flow. These fan blades can be arranged, for example, on a wall or supporting wall surrounding the cooling air wheel accommodation space. However, the cooling air wheel accommodation space does not have to be completely or partially closed off by such a wall.

[0057] It is also possible for the fan blades to be held between supports of the cooling air wheel that are spaced apart from one another with respect to the motor axis, and to completely or at least partially delimit the cooling air wheel receiving space on the circumference with respect to the motor axis. This results in an at least partially open construction, in which the fan blades are held, for example, on the supports, which are in particular annular or ring-shaped, and which are spaced apart from the motor axis. The rings or annular supports can have different diameters with respect to the motor axis. This means, for example, that the fan blades can be held at a smaller radial distance from the motor axis by one ring or annular support near the drive motor, and at a greater distance from the drive motor with respect to the motor axis, they can be held at a greater radial distance from the motor axis.

[0058] The fan section of the cooling air wheel, in particular the supporting wall, is inclined in a plane along which the motor axis runs, preferably at an oblique inclination obliquely to the motor shaft or motor axis and / or has a stepped contour. The plane is, for example, a radial plane or radial plane and / or parallel to the motor axis. The oblique inclination of the fan section or the supporting wall is, for example, approximately 10° to 80°, more preferably approximately 20° to 70°, even more preferably approximately 30° to 60°, even more preferably approximately 35° to 55°, and particularly preferably approximately 40° to 50°. It is therefore possible for the fan section to run relatively steeply with respect to the motor shaft or motor axis. This results in a particularly pronounced bell shape of the fan section.

[0059] The cooling air wheel and / or the cooling air wheel receiving space and / or a wall surrounding the cooling air wheel receiving space and / or a side of the fan blades facing the motor axis and / or an envelope of the cooling air wheel on its side facing the cooling air wheel receiving space relative to the motor axis is preferably bell-shaped and / or has at least one step. The wall supports, for example, the fan blades or is the supporting wall supporting the fan blades.

[0060] For example, the envelope relative to the motor axis defines an inner circumferential contour of the cooling air wheel relative to the motor axis. The envelope is defined, for example, entirely or partially by sides of the fan blades facing the motor axis, in particular narrow sides. It is further advantageous if the dust-generating air wheel has an inclined profile and / or at least one step on its side facing the cooling air wheel receiving space, wherein the inclined profile or step corresponds or correlates with the inclined profile or step of the cooling air wheel and / or the cooling air wheel receiving space and / or the wall surrounding the cooling air wheel receiving space.

[0061] Opposite sections of the cooling air wheel and / or the bearing support and / or the dust air wheel can, for example, have corresponding inclined profiles and stepped profiles. Thus, for example, a stepped section can have steps that correspond to the profile of an adjacent inclined section.

[0062] The fan blades can have at least one slant.

[0063] When the grinding machine is in operation, the cooling air wheel rotates in one direction around a rotation axis of the cooling air wheel, preferably around the motor axis.

[0064] A fan blade can, for example, be inclined in a direction of rotation and / or with respect to a direction of rotation in which the cooling air wheel rotates during operation of the grinding machine.

[0065] One or more fan blades preferably have an oblique inclination with respect to the motor axis

[0066] The fan blades are inclined at an angle relative to a direction of rotation in which they can be driven by the drive motor. Such an inclination can, for example, be a first inclination.

[0067] A fan blade can also have an oblique inclination relative to a plane radial to the motor axis, in which the motor axis or the rotational axis of the cooling air wheel runs. Such an oblique inclination can, for example, be a second oblique inclination. The fan blades can be obliquely inclined, particularly in radial planes and / or to planes in which the motor axis runs entirely.

[0068] A fan blade can have only one of the aforementioned first and second inclinations. Furthermore, it is possible for a fan blade to have both of the aforementioned inclinations. The inclinations can overlap one another and / or be arranged one behind the other with respect to a flow direction in which a portion of the cooling air flow flows along a respective fan blade.

[0069] Between differently inclined sections of a fan blade, an interlacing and / or twisting and / or a twist can be provided. The differently inclined sections can be interlaced and / or twisted and / or twisted within themselves. The inclined inclinations can run in at least two different dimensions and / or spatial directions and can merge into one another in an interlaced, twisted, or twisted manner.

[0070] It is advantageous if the fan blades are inclined at an angle relative to the motor axis or have inclined sections relative to the motor axis. The inclined angle can be an inclined angle in a single direction, i.e., for example, the fan blades have an inclined angle in the direction of rotation in which the fan wheel rotates. Furthermore, a fan blade can also have an inclined angle in or relative to a plane along or in which the motor axis runs entirely. A combination of both of the aforementioned inclined angles is also possible for a given fan blade.

[0071] The at least one oblique inclination, in particular the first and / or second oblique inclination, is preferably at least 5°, more preferably at least 10°, even more preferably at least 15° or 20°, even more preferably at least 25° or 30°. The at least one oblique inclination, in particular the first and / or second oblique inclination, is preferably at most 70°, even more preferably at most 60°, even more preferably at most 50° or at most 45°.

[0072] The first and second inclinations are preferably different from each other and / or have different angles of inclination.

[0073] The fan blades preferably have at least two different inclinations, wherein the inclinations are different with respect to their direction of inclination and / or their angle of inclination.

[0074] The fan blades have upstream blade leading edges or inlet edges or leading edges in the direction of rotation and downstream blade trailing edges or trailing edges or in the direction of rotation.

[0075] A portion of the cooling air flow flows, for example, past a leading edge of a respective fan blade in the direction of a trailing edge of the fan blade.

[0076] The fan blades of the cooling air wheel thus have a blade leading edge, from which a portion of the cooling air flow flows along the respective fan blade and / or at which a portion of the cooling air flow engages the respective fan blade. This portion of the cooling air flow flows radially outward at the blade trailing edge, away from the respective fan blade relative to the rotational axis of the cooling air wheel or the motor axis.

[0077] A leading blade edge, or leading edge, or leading edge in the direction of rotation is advantageously arranged in front of the trailing blade edge, or trailing edge, or leading edge in the direction of rotation. This can be achieved, for example, by each fan blade having at least one oblique inclination with respect to one or the direction of rotation around which the cooling air wheel rotates. Advantageously, the leading edge of each fan blade is spaced longitudinally from the trailing edge of the blade relative to the motor axis and / or parallel to the motor axis.

[0078] It is advantageously provided that the blade leading edge and the blade trailing edge of a respective fan blade do not overlap with respect to the motor axis and / or parallel to the motor axis.

[0079] It is advantageously provided that the at least one fan blade or all fan blades are designed such that a deflection of the cooling air flow from a flow direction approximately parallel to the motor axis or axis of rotation of the cooling air wheel, in which the cooling air flow flows into the cooling air wheel, into a direction transverse, in particular approximately at right angles transverse, to the motor axis or axis of rotation of the cooling air wheel, in which the cooling air flow flows out of the cooling air wheel, is brought about entirely or substantially, preferably at least 80%, even more preferably at least 90%, by the at least one fan blade or the fan blades.

[0080] A redirection of the flow direction of the cooling air flow in the cooling air wheel preferably takes place away from a hub or a center of the cooling air wheel, preferably entirely or substantially, preferably at least 80%, even more preferably at least 90%, by the at least one fan blade or blades. In this embodiment, the hub or the center of the cooling air wheel contributes to a maximum of 20%, preferably a maximum of 10%, or not at all, in the redirection of the cooling air flow.

[0081] It is advantageously provided that the blade leading edge and / or blade trailing edge of the at least one fan blade is substantially straight.

[0082] Furthermore, it is advantageous if an intermediate section of the at least one fan blade, between its blade leading edge and its blade trailing edge, has an arcuate shape and / or oblique inclination with respect to a plane parallel to the rotational axis of the cooling air wheel or the motor axis and traversed by the rotational axis or motor axis. The arcuate shape or oblique inclination is advantageously configured such that a radially inner region of the intermediate section with respect to the motor axis or the rotational axis of the cooling air wheel is arranged in front of a radially outer region of the intermediate section in the direction of rotation of the cooling air wheel.

[0083] A directional component of the blade leading edge in the radial direction with respect to the motor axis or rotational axis of the cooling air wheel is preferably greater than the directional component of the blade trailing edge in the radial direction with respect to the motor axis or rotational axis of the cooling air wheel.

[0084] The blade leading edge preferably extends substantially radially with respect to the motor axis or rotational axis of the cooling air wheel or at an angle of maximum 30° with respect to an axis radial to the motor axis or rotational axis of the cooling air wheel.

[0085] It is advantageous if, on the one hand, the motor axis or the rotational axis of the cooling air wheel and, on the other hand, the blade leading edge of a fan blade of the cooling air wheel or the blade leading edges of all fan blades of the cooling air wheel are at right angles to each other or at an angle between 80° and 100°.

[0086] In particular, the leading edge of a fan blade of the cooling air wheel or the leading edges of all fan blades of the cooling air wheel are not parallel to the motor axis or the rotational axis of the cooling air wheel.

[0087] A directional component of the blade trailing edge parallel to the motor axis or rotational axis of the cooling air wheel is preferably greater than the directional component of the blade leading edge parallel to the motor axis or rotational axis of the cooling air wheel.

[0088] The blade trailing edge preferably runs substantially parallel to, or at an inclination of, the motor axis or the rotational axis of the cooling air wheel. A respective inlet region of a fan blade preferably forms an axial section. The axial section essentially serves to generate a cooling air flow parallel to the motor axis or along the motor axis or the rotational axis of the cooling air wheel. The axial section forms, so to speak, an inlet region of a fan blade. The axial section extends behind the leading edge of a fan blade.

[0089] Each outlet area of ​​a fan blade preferably forms a radial section. The radial section essentially serves to generate a cooling air flow that flows radially toward the motor axis or the rotational axis of the cooling air wheel. The radial section extends toward the blade trailing edge and ends at the blade trailing edge.

[0090] In principle, it is possible for the inlet area of ​​a fan blade to run approximately parallel to the motor axis or the rotational axis of the cooling air wheel. This can result in a main flow direction essentially along the rotational axis of the cooling air wheel and / or an axial fan function.

[0091] However, such an axial fan function can also be easily achieved with the following advantageous design of the fan blades.

[0092] Preferably, the axial section or inlet region of a fan blade, at which the blade leading edge is arranged, already has an oblique inclination with respect to the direction of rotation around which the cooling air wheel rotates. It is therefore advantageous if the inclination of a fan blade behind its blade leading edge has a directional component in the direction of rotation that is greater than a directional component of this inclination parallel to the axis of rotation of the cooling air wheel. The fan blade is therefore gently inclined behind its blade leading edge, at which part of the cooling air flow flows along the fan blade. This measure counteracts turbulence in the cooling air flow, particularly in the inlet region into the cooling air wheel.

[0093] The radial section and the axial section of a fan blade can have different inclinations with respect to the direction of rotation of the cooling air impeller. The radial section and the axial section of a fan blade can have continuously merging inclinations or be interlaced.

[0094] It is advantageous for the outlet region of a fan blade or radial section to have an oblique inclination with a smaller directional component in the direction of rotation than the inlet region or axial section of a fan blade. In other words, for example, the axial section is inclined more gently with respect to the direction of rotation than the radial section.

[0095] Between adjacent fan blades, an inlet flow cross-section and an outlet flow cross-section are defined for the passage of a portion of the cooling air flow, which flows in between the fan blades through the inlet flow cross-section and out again from the space between the fan blades through the outlet flow cross-section. The respective flow cross-section can be limited by the supporting wall of the cooling air wheel and a component opposite the supporting wall, in particular a wall. An advantageous concept provides for the inlet flow cross-section to be larger than the outlet flow cross-section. This measure can contribute to accelerating the cooling air flow.

[0096] A blade leading edge of a fan blade is preferably arranged closer to the drive motor than a blade trailing edge of the fan blade.

[0097] Advantageously, a section of a respective fan blade that is closer to the drive motor with respect to the motor axis is arranged in the direction of rotation in front of a section of this fan blade that is further away from the drive motor.

[0098] The cooling air wheel preferably has a ribbed structure in the region of the holding section. The ribbed structure has multiple ribs. The ribs run, for example, parallel to the motor axis or are oriented parallel to the motor axis. The ribs can, for example, be provided to generate the cooling air flow or contribute to generating the cooling air flow. It is also possible for the ribs to be support ribs or to be functionally designed as support ribs.

[0099] The fan blades of the cooling air wheel, for example, have free narrow sides facing away from the motor axis.

[0100] A preferred concept or an independent invention in connection with the features mentioned above or the preamble of claim 1 provides that the cooling air impeller is designed as an axial-radial fan impeller or diagonal fan impeller. The axial-radial fan impeller or diagonal fan impeller can, for example, convey the cooling air flow from the drive motor from a direction approximately parallel to the motor axis, radially outward relative to the motor axis. For example, it is provided that the cooling air impeller is designed to deflect the cooling air flow such that the cooling air flow flows out of the machine housing radially outward relative to the motor axis.

[0101] Advantageously, the cooling air wheel is provided with outlet openings of the grinding machine, in particular of the machine housing, radially outward relative to the motor axis or rotational axis of the cooling air wheel. The flow direction of the cooling air flow is preferably such that cooling air flows into the machine housing from a side facing away from the tool holder, flows through the motor, is sucked in by the cooling air wheel, and is expelled radially outward relative to the motor axis from the machine housing or grinding machine.

[0102] The cooling air flow is thus preferably redirected exclusively from a direction parallel to the motor axis to a direction radial to the motor axis by the cooling air impeller. Other air guiding means for redirecting the cooling air flow are possible but not absolutely necessary. The cooling air impeller advantageously forms the only means for redirecting the cooling air flow from a direction parallel to the motor axis to a direction radial to the motor axis. To redirect the cooling air flow, the fan impeller advantageously has a hub wall, in particular formed by the supporting wall or provided on the supporting wall. The hub wall is, for example, conical or bell-shaped.

[0103] However, it is also possible to provide a directional deflection of the cooling air flow from a wall that is fixed relative to the machine housing and parallel to the motor axis, radial to the motor axis, and on or next to which the cooling air wheel is located. This wall can represent an additional measure provided in addition to the directional deflection of the cooling air flow by the cooling air wheel.

[0104] It is advantageously provided that, with respect to the motor axis or in the direction of the motor axis, a height of the cooling air wheel receiving space is at least 50%, preferably at least 60%, more preferably at least 70% of the total height of the cooling air wheel.

[0105] It is preferably provided that the maximum area of ​​a cross-section of the cooling air wheel receiving space penetrated vertically by the motor axis is at least 40%, preferably at least 50%, even more preferably at least 60% of a maximum cross-sectional area of ​​the entire cooling air wheel penetrated vertically by the motor axis.

[0106] It is advantageous that, with respect to the motor axis, a height of the dust air wheel receiving space is at least 50%, preferably at least 60%, more preferably at least 70% of the total height of the dust air wheel.

[0107] It is preferably provided that the maximum area of ​​a cross-section of the dust air wheel receiving space penetrated vertically by the motor axis is at least 40%, preferably at least 50%, even more preferably at least 60% of a maximum cross-sectional area of ​​the entire dust air wheel penetrated vertically by the motor axis.

[0108] The measure explained below represents an independent invention in connection with the preamble of claim 1 or the initially mentioned embodiment of the grinding machine, which, however, can also represent an advantageous embodiment of the invention and / or embodiment of the grinding machine explained so far.

[0109] It is provided that the cooling air wheel and / or the bearing carrier are at least partially arranged in a tapered section of the machine housing, wherein the tapered section extends around the motor axis between a section of the machine housing having the tool holder and a section of the machine housing opposite the tool holder, and has a smaller diameter relative to the motor axis than these sections or one of these sections. For example, the section of the machine housing facing the disc tool or the tool holder has a larger diameter in order to provide the dust removal space above the disc tool. The section opposite this and further away from the tool holder can serve, for example, as a handle section or as a hand rest.For example, this section further away from the tool holder projects in front of the tapered section in the working direction so that an operator can grasp a part of the machine housing and reach into the tapered section. The tapered section is, for example, tubular or roughly cylindrical. The tapered section forms, for example, a recess or an engagement contour into which an operator can reach, for example, with his fingertips. For example, the holding section of the cooling air wheel is arranged wholly or partially in the tapered section of the machine housing. However, it can also be provided that the fan section is accommodated wholly or at least partially in the tapered section of the machine housing.

[0110] An outer circumferential contour or envelope of the cooling air wheel or the bearing carrier, for example, has a contour that correlates with and / or is designed similarly to a transition section between the tapered section and the section of the machine housing having the tool holder. An advantageous embodiment provides that the fan section, in particular the fan blades, engage in the tapered section of the machine housing, in particular that an envelope of the fan blades, in an area engaging in the tapered section of the machine housing, has an outer circumferential contour that correlates with an inner circumferential contour of the machine housing or is adapted to the course of the inner circumferential contour. For example, the fan blades therefore engage in the tapered section of the machine housing.

[0111] For example, the machine housing has its smallest diameter at the tapered section. The tapered section serves, for example, to accommodate the drive motor, or the drive motor is located or housed in the tapered section of the machine housing.

[0112] An embodiment of the invention is explained below with reference to the drawings. They show:

[0113] Figure 1 is a perspective oblique view of a hand-held power tool with a dust collection container,

[0114] Figure 2 shows the oblique view of the hand-held power tool according to Figure 1, but with a connected suction hose,

[0115] Figure 3 shows the hand-held machine tool according to Figure 2 from below,

[0116] Figure 4 is a side view of the hand-held power tool according to the preceding figures, partly in section,

[0117] Figure 5 is a perspective oblique view of a section through a front part of the hand-held power tool according to Figure 1, approximately along a section line AA in Figure 1, Figure 6 is a sectional view similar to Figure 5, but through the hand-held power tool according to Figure 2 and directly from above, approximately along a section line BB in Figure 2,

[0118] Figure 7 is an exploded view of the hand-held power tool according to the preceding figures,

[0119] Figure 8 is a perspective oblique view of a dust air wheel of the hand-held power tool,

[0120] Figure 9 shows a longitudinal section through a front part of the hand-held power tool according to the preceding figures, approximately corresponding to the sectional view according to Figure 4,

[0121] Figure 10 shows a bearing carrier, a motor bearing and a drive motor of the hand-held power tool,

[0122] Figure 11 is a perspective oblique view of a dust collection device with a clamping device for connection to the hand-held power tool,

[0123] Figure 12 is a perspective oblique view of a suction hose with a clamping device for connection to the hand-held power tool,

[0124] Figure 13 is a partial rear view of the hand-held power tool according to the preceding figures with the clamping device of the dust collection container shown in Figures 11 or 12 in the clamping position (the dust collection container is otherwise not shown),

[0125] Figure 14 shows the view according to Figure 13 with the clamping device in the release position, Figure 15 shows a variant of the hand-held power tool according to the preceding figures with a closure device for closing an external air inlet,

[0126] Figure 16 is a perspective detailed view of the variant according to Figure 15, wherein an upper and rear part of the hand-held power tool are not shown,

[0127] Figure 17 is a perspective detail view from below of a variant of the hand-held power tool with a further locking device, approximately corresponding to a detail D in Figure 15,

[0128] Figure 18 is a sectional view through the detail according to Figure 17, approximately along a section line CC shown in Figure 6, with the locking device in the closed position,

[0129] Figure 19 shows the sectional view according to Figure 18, but with the locking device in the open position,

[0130] Figure 20 shows the hand-held power tool according to Figure 1 with its upper side placed on a base,

[0131] Figure 21 Hand-held power tool in the position shown in Figure 20, but without energy storage and dust collection container, and

[0132] Figure 22 shows the hand-held machine tool in the position according to Figure 20, but from the front and without a dust collection container and a smaller disc tool.

[0133] A hand-held power tool 10 according to the drawing is configured, for example, as a grinding machine 11. The hand-held power tool 10 has a drive motor 12, the output of which rotates about a motor axis M and drives a gear 13, for example, an eccentric gear, oscillation gear, or the like, which in turn drives a tool holder 14 in a rotational and / or eccentric and / or hypercycloidal manner.

[0134] The drive motor 12 is an electric drive motor. The drive motor 12 has, for example, a stator 12A and a rotor 12B.

[0135] The tool holder 14 rotates about a tool axis W or is driven or drivable in rotation about a tool axis W.

[0136] For example, the tool axis W and the motor axis M are eccentric to each other.

[0137] The gear 13 is or comprises, for example, an eccentric gear or eccentric bearing 13A.

[0138] The drive motor 12 and the gear 13 form a drive train 13B or at least parts of a drive train 13B, which is accommodated in a machine housing 15 of the hand-held power tool 10.

[0139] The hand-held power tool 10 is a hand-held power tool, or one that is to be guided or guided manually by an operator. Accordingly, the operator can freely guide the hand-held power tool along a workpiece surface WO, for example, forward in a main working direction HA or backward against the main working direction HA or transverse to the main working direction HA.

[0140] The machine housing 15 has a drive section 16 that houses the drive motor 12 and the transmission 13, thus the drive train. The drive section 16 has, for example, a motor mount 16A for accommodating the drive motor 12.

[0141] A handle section 17, which, for example, has or is formed by a hand rest, is arranged on the drive section 16. The handle section 17 or the hand rest is suitable for gripping with an operator's hand and / or for supporting an operator's hand.

[0142] A handle 18 protrudes from the drive section 16, for example, opposite to the main working direction HA. The handle section 17 and the handle 18 are arranged, for example, on a front section or front side 19 and a rear section or rear side 20 of the machine housing 15 with respect to the main working direction HA.

[0143] The tool holder 14 and / or the tool axis W and / or the motor axis M are located approximately in the region of a longitudinal center plane 23 extending from the front 19 to the rear 20 of the hand-held power tool 10. The handle section 17 is arranged on an upper side 24 of the hand-held power tool 10, while the tool holder 14 is arranged on a lower side 25 opposite the upper side 24. The lower side 25 is provided for guiding the hand-held power tool 10 along the workpiece surface WO or lies opposite the workpiece surface WO during operation of the hand-held power tool 10.

[0144] The hand-held power tool 10 is preferably a battery-operated or rechargeable hand-held power tool. The concepts explained below regarding dust removal, drive train design, and optimized attachment or a dust collection device could also be readily implemented in a mains-powered hand-held power tool. In this case, the hand-held power tool 10 would have, for example, a connecting cable for connection to a power supply network.

[0145] An energy storage connection 26 for an electrical energy storage device 27, for example a battery pack, is arranged slightly off-center with respect to the longitudinal center plane 23.

[0146] The energy storage connection 26 is provided, for example, on a holding section 26A of the machine housing 15. The holding section 26A extends between the drive section 16 and an end region of the handle 18 remote from the drive section 16.

[0147] A through-opening 18A is provided between the handle 18 and the holding part 26A. A hand grasping the handle 18 can engage the through-opening 18.

[0148] The tool holder 14 is arranged within and / or below a cover 30, which extends from the drive section 16 to the underside 25 of the hand-held power tool 10. The cover 30 defines a dust removal chamber 31, which is provided for collecting and removing dust generated during the machining of the workpiece surface WO.

[0149] For example, a disc tool 90, in particular a grinding tool, can be releasably attached to the tool holder 14. For this purpose, the disc tool 90 has, for example, a drive holder 91. The drive holder 91 and the tool holder 14 comprise, for example, bayonet contours / or rotary drive contours and / or a screw connection or the like.

[0150] The disc tool 90 has a processing surface 92, for example, a grinding surface or polishing surface, wherein the grinding surface can also be formed by an abrasive that can be detachably attached to the disc tool 90. Inlet openings 93 into which air can flow are arranged on the processing surface 92. For example, a dust-laden air stream, i.e., a dust air stream S, can flow through the inlet openings 93 toward the dust removal chamber 31, wherein the dust air stream S can flow out through outlet openings 94, which are fluidly connected to the inlet openings 93, on a mounting side 95 of the disc tool 90 opposite the processing surface 92 and intended for mounting on the handheld power tool 10.

[0151] An annular seal 31A or sealing sleeve surrounds the dust removal chamber 31. The seal 31A is held, for example, by the machine housing 15 and rests against the mounting side 95 of the disk tool 90. The outlet openings 94 are arranged in an interior space surrounded by the seal 31A.

[0152] It is possible for the dust removal chamber 31 to be vacuumed, for example, using an STA vacuum cleaner. In this case, actively generating a dust air flow by the hand-held power tool 10 is not necessary, but possible.

[0153] In the present case, however, the hand-held power tool 10 or grinding machine 11 has an active generation of the dust air flow or is designed to actively generate the dust air flow. Arranged within the dust removal chamber 31 is a dust air wheel 32, which is driven or drivable by the drive motor 12. For example, the dust air wheel 32 is arranged at the output of the drive motor 12.

[0154] The dust air wheel 32 can support the dust air flow S even when the vacuum cleaner STA is connected to the dust removal connection 33.

[0155] The dust air wheel 32 thus generates a dust air flow S or supports its flow.

[0156] The dust air wheel 32 is rotationally fixedly connected to a motor shaft 12C of the drive motor 12, which represents the output of the drive motor 12. The drive motor 12 or the motor shaft 12C rotates in a direction of rotation DR.

[0157] The dust air wheel 32 rotates in the direction of rotation DR, so that the dust air flow S flows through the dust removal chamber 31 with the direction of rotation DR and flows into the dust removal connection 33.

[0158] The dust air wheel 32 and optionally the vacuum cleaner STA generate an air flow that sucks in particles, dust, or the like, which arise, for example, during the machining of the workpiece surface WO, through the inlet openings 93 of the disc tool 90. The dust air flow S thus generated flows from the outlet openings 94 into the dust removal chamber 31, where the dust air wheel 32 conveys it further toward the dust removal connection 33.

[0159] The dust removal connection 33 is designed, for example, as a removal connection pipe 34 or a removal connection nozzle 35 or has a connection pipe 34 or a connection nozzle 35.

[0160] The dust removal connection 33 is preferably arranged approximately tangentially with respect to the dust air wheel 32.

[0161] The dust removal connection 33 is advantageously arranged off-center with respect to the longitudinal center plane 23, for example close to the longitudinal side 23. Thus, the dust air or the dust air flow S flows out of the dust removal chamber 31 eccentrically to the tool axis W and tangentially to the same.

[0162] A dust removal device 50 can be connected to the dust removal connection 33.

[0163] In principle, the hand-held power tool 10 or grinding machine 11 can also be operated without a dust removal device 50, in which case the dust air flow S is blown out into the environment via the dust removal connection 33.

[0164] The dust removal device 50 is, for example, a dust removal device 50A in the form of a suction hose 70A or a dust removal device 50B in the case of a dust collection device 70.

[0165] Both dust removal devices 50A and 50B can collect dust flowing through the dust removal port 33. For example, the STA vacuum cleaner can collect dust. Furthermore, the dust collection device 70 can collect dust.

[0166] Both dust removal devices 50A and 50B can be selectively connected to the dust removal connection 33 and, for this purpose, have a tubular connecting body 51A or 51B. The connecting bodies 51A or 51B can be plugged onto the dust removal connection 33, for example, the removal connection pipe 34, along a plug-in axis ST or can be removed from the dust removal connection 33 by a pulling movement.

[0167] Both dust removal devices 50A and 50B are sometimes also generally referred to as dust removal device 50 in the following description.

[0168] The connecting bodies 51 A, 51 B are also generally referred to as connecting bodies 51, in particular when the same or similar components are present in both dust removal devices 50 A, 50 B or connecting bodies 51 A, 51 B.

[0169] The connecting bodies 51 A and 51 B are equipped with clamping devices 52 with which the dust removal devices 50 A and 50 B are connected to the dust removal connection

[0170] 33 can be clamped.

[0171] For the connecting body 51A, a variant shown in Figures 2 and 3 is also possible, which does not require a clamping device 52. In particular, this embodiment without a clamping device 52 is optionally conceivable if the following optional measure, a form-fitting contour, is provided on the tubular connecting body 51A.

[0172] In addition, as an optional measure, at least one form-locking contour 56A is provided, which projects radially inward into the connecting body 51 A or 51 B and engages with at least one counter-form-locking contour 36 on the connecting pipe

[0173] 34 or connecting piece 35. For example, two or more form-fitting contours 56A can be provided on opposite sides and / or at an angular distance with respect to a longitudinal extension or longitudinal extension axis of the connecting body 51A or 51B.

[0174] The at least one counter-form-locking contour 36 is arranged radially outside a flow cross-section of the dust removal connection 33. For example, the counter-form-locking contour 36 is configured as an arrangement of form-locking receptacles and / or form-locking projections or the like.

[0175] When the at least one form-locking contour 56A engages the at least one counter-form-locking contour 36, the dust removal device 50 is fixed in a tensile-resistant manner, for example, opposite to the plug-in axis ST, along which the dust removal device 50 can be plugged onto the dust removal connection 33.

[0176] The at least one form-locking contour 56A and the at least one counter-form-locking contour 36 advantageously form an anti-twist device, in particular in conjunction with a form-locking contour 56B, which will be explained in more detail below and which, in the case of the dust collection device 70, is provided on its connecting body or close to its connecting body 51B.

[0177] The clamping device 52 enables the dust removal device 50 to be held particularly well on the dust removal connection 33. The clamping device 52 is adjustable between a clamping position KS, in which a receiving cross-section 55 of the connection body 51 is narrowed, and a release position FS, in which the receiving cross-section 55 is so large that the dust removal device 50 can be removed from the dust removal connection 33 along the plug-in axis ST.

[0178] Advantageously, the receiving cross-section 55 in the release position FS is so large that the form-locking contour 56A can also disengage from the counter-form-locking contour or the counter-form-locking contours 56. The form-locking contour 56A is designed, for example, as a form-locking projection that projects into the receiving cross-section 55.

[0179] It is also possible that in the release position FS the receiving cross-section 55 is so large that the form-locking contour 56A is rotatable relative to the at least one form-locking contour 56, so that the form-locking contours 56 and 56A can be brought into a rotational position such that they can be displaced past one another along the plug-in axis ST.

[0180] The clamping device 52 has a clamp 53. The clamp 53 can be formed, for example, by sections of the connecting body 51A or 51B.

[0181] The clamp 53 can also be a clamp surrounding the connecting body 51 A or 51 B and separate from the connecting body 51 A or 51 B, for example in the form of a clamping clip, in a manner not shown.

[0182] The clamp 53 has, for example, clamping legs 54 which, in a position moved towards each other, narrow the receiving cross-section 55 and, in a position moved away from each other, enlarge the receiving cross-section 55.

[0183] An actuating element 57X in the form of a pivot lever 57 serves to actuate the clamping device 52. The pivot lever 57 is pivotably mounted about a pivot axis SA on the connecting body 51 or close to the connecting body 51 by means of a pivot bearing 57A.

[0184] For example, the pivot bearing 57A has one or more axle bodies 57B that engage with bearing receptacles 57C of the pivot lever 57.

[0185] Thus, the pivot lever 57 is pivotably mounted on the axle body 57B about the pivot axis SA by means of the bearing mounts 57C.

[0186] The pivot lever 57 has a pivot arm 57D that can be grasped by an operator and projects from the pivot bearing 57A. The pivot arm 57D has an actuating contour 57E in the area of ​​the pivot bearing 57A, for example, close to the bearing receptacle 57C. The actuating contour 57E includes an eccentric contour 57F that runs eccentrically to the pivot axis SA. Thus, when the pivot lever 57 is adjusted between a release actuation position FB assigned to the release position FS, in which the pivot lever 57 protrudes from the connecting body 57, into a clamping actuation position KB assigned to the clamping position KS, sections of the eccentric actuation contours 57B which are increasingly eccentrically spaced further from the pivot axis SA engage with a support section of the connecting body 51 provided for supporting the actuation contours 57B in order to actuate and / or linearly adjust a tie rod 58.The support part of the connecting body 51 is provided, for example, on the outer circumference of the connecting body 51 or the pipe body or is formed by this outer circumference.

[0187] The tie rod 58 passes through the two clamps 53 in the area of ​​the free end portions of the clamping legs 54. The tie rod 58 has, for example, a bolt portion 58A extending between a support head 58B and a driving head 58C. The bolt portion 58A passes through openings 54A at the free end portions of the clamping legs 54.

[0188] The support head 58B rests on the outside of the clamping leg 54, which is further away from the pivot lever 57. The driving head 58C rests near the pivot lever 57 on the axle body 57B, which has a receptacle 57I penetrated by the bolt portion 58A.

[0189] Thus, when the eccentric contour 57C rests on the connecting body 51 upon actuation of the pivot lever 57 from the release actuation position FB into the clamping actuation position KB, a tensile force ZK acts on the tie rod 58, which actuates the support head 58B in the direction of the pivot lever 57, thereby narrowing the receiving cross-section 55 so that the connecting body 51A or 51B clamps to the dust removal connection 33, for example, the outer circumference of the connecting pipe 34. This ensures an optimal clamp fit and hold of the respective dust removal device 50A, 50B on the dust removal connection 33.

[0190] When the clamping device 52 is moved from the clamping position KS to the release position FS, it is an option for the tie rod 58, for example, to act as a thrust element, for example by means of the support head 58B. If the support head 58B or a driving contour arranged close to it drives the clamping leg 54, on which the support head 58B is arranged, from the other clamping leg 54, which is close to the driving head 58C, the two clamping legs 54 are moved away from each other in the sense of an enlargement of the receiving cross-section 55, for example by a thrust force SK.

[0191] Alternatively or in addition to actuating the clamping device 52 from the clamping position KS toward the release position FS, a spring device 57J can also be provided, for example, an elastic block-shaped body, a coil spring, or the like. The spring device 57J is arranged, for example, between the clamping legs 54 or their free end regions and is supported on the clamping legs 54. The spring device 57J is penetrated, for example, by the bolt portion 58A of the tension rod 58.

[0192] The swivel arm 57C has a receiving contour 57G, for example a trough-like depression, into which the connecting body 51 in the

[0193] Clamping actuation position KB engages and / or in which the connecting body 51 is received in the clamping actuation position KB. Thus, the pivot arm 57D nestles, so to speak, against the connecting body or its tubular shape. However, in the clamping actuation position KB, a grip projection 57H suitable for gripping by an operator protrudes from the connecting body 51, so that the operator can conveniently grasp the pivot lever 57 by the grip projection 57H for actuation and / or pivoting in the direction of the release actuation position FB.

[0194] The connecting body 51B of the dust collection device 70 is arranged on a support body 71, which serves to support a dust collection container 75. The dust collection container 75 is held on a further support body 72. The support bodies 71, 72 are adjustable relative to one another, for example pivotally mounted on one another, for example by means of a pivot bearing 73. Both support bodies 71 and 72 have through-openings 71A and 72A for the dust air flow S, wherein the through-opening 71A of the support body 71 is fluidly connected to the connecting body 51. When the support bodies 71, 72 are adjusted away from one another, the through-opening 72A of the dust collection container 75, which is significantly larger than the through-opening 71A, becomes free and through which the dust collection container 75 can be emptied. The support body 71 thus forms, for example, a cover for the passage opening 72A of the support body 72.

[0195] However, it is also possible to remove the dust collection device 70 from the dust removal connection 33 for emptying, so that dust retained in the dust collection container 75 can be emptied through the connection body 51 B.

[0196] The support bodies 71, 72 can be fixed to one another by means of a fixing device 74, for example a clamping device, locking device, or the like, so that they lie flat against one another and a flow connection is established between the connecting body 51 and the dust collection container 75, but the passage opening 72A is closed. The fixing device 74 can also be referred to as a support body fixing device. Accordingly, the clamping device or locking device can be a support body clamping device or a support body locking device.

[0197] The dust collection container 75 has a cubic or block-shaped configuration. For example, the dust collection container 75 has opposing side walls 75A, 75B, which can form, for example, upper and lower side walls. Longitudinal side walls 75C extend between the side walls 75A, 75B. The support body 72 is arranged, for example, on a front wall 75D. On a side facing away from the support body 72, the dust collection container 75 is delimited or closed by a rear wall 75E. The rear wall 75E can, for example, have sections 75F and 75G that are angled to one another. Thus, apart from the opening in the support body 72 or the connecting body 51, there is no opening in the dust collection container 75.

[0198] The dust collection container 75 preferably consists of a filter material, for example textile material or the like.

[0199] A support body 77, for example made of wire or the like, serves to hold the dust collection container 75 in an open or elongated shape. The support body 77 is preferably arranged in the interior of the dust collection container 75. Support body sections of the support body 77 are preferably located approximately in the region of the inner edges of the dust collection container 75. The dust collection container 75 is advantageously clamped by the support body 77.

[0200] The support body 77 is held on the support body 72 and extends away from it with a support body longitudinal section 77A.

[0201] In the area of ​​the rear wall 75D, a support body transverse section 77B of the support body 77 is provided, which protrudes from the support body longitudinal section 77A. The support body 72 and the support body transverse section 77B, together with the support body longitudinal section 77A connecting the two components, form a U-shaped configuration. A support body section 77C protrudes from the support body transverse section 77B to the side wall 75B and is connected to the support body 72 by means of a support body section 77D and a support body section 77E. The support body sections 77B and 77D run approximately parallel to one another, as do the support body sections 77A and 77D. For example, the support body sections 77A and 77B as well as the support body sections 77D and 77E are approximately L-shaped.

[0202] No element of the support body 77 is provided on the side of the dust collection container 75 associated with the handle 18, so that an operator, when gripping the handle 18 and / or attaching or removing the energy storage device 27 to the energy storage connection 26, can, so to speak, engage in a soft section 75M of the dust collection container 75 without the support body 77 being in the way.

[0203] The dust collection device 70 can be easily connected to the dust removal connection 33 by providing a plug-in guide 80 and / or an anti-rotation contour 81 to guide and hold the dust collection device 70 in a rotationally secure manner with respect to the plug-in axis ST at the dust removal connection 33. The plug-in guide 80 comprises a plug-in guide contour 80A. The plug-in guide contour 80A and the anti-rotation contour 81 are arranged on the dust collection device 70, in particular on its connection body 51B.

[0204] A plug-in guide contour 80B interacting with the plug-in guide contour 80A and an anti-rotation contour 81B interacting with the anti-rotation contour 81 are arranged on the dust removal connection 33. For example, the plug-in guide contour 80B and the anti-rotation contour 81B are formed by an end face or end wall surrounding the external air inlet 40.

[0205] In the case of the suction hose 70A, a firm hold achievable by means of the clamping device 52 enables, for example, an operator to grasp the suction hose 70A, which is connected to the connecting body 51A, if necessary, in order to move the grinding machine 11 along the workpiece surface WO. The suction hose 70A has the connecting body 51A at one longitudinal end and a connecting body 51C at an opposite longitudinal end for connection to the vacuum cleaner STA.

[0206] In the case of the dust collection device 70, the clamping fit of the connecting body 51B on the dust removal connection 33 also proves advantageous because it allows for a quick change or replacement of the dust collection device 70. In particular, this also allows the dust removal device 50B to simultaneously close an external air inlet 40, explained below, which remains open when the dust removal device 50A or the suction hose 70A is connected.

[0207] The external air inlet 40 is arranged next to the dust removal connection 33 and close to the dust removal connection 33 and allows external air F to flow into the dust removal chamber 31. The external air inlet 40 is therefore arranged on the rear side 20 of the machine housing 50, as seen with respect to the main working direction HA. An external air duct 40A, on which the external air inlet 40 is arranged, extends from the rear side 20 of the machine housing 50 and / or on the rear side of the dust removal chamber 31. The external air inlet 40 and an inlet opening 40B for the flow of external air F into a receiving chamber 32A, in which the dust air wheel 32 is arranged, are fluidly connected to one another via the external air duct 40A.

[0208] External air F flowing in through the external air inlet 40 flows through the external air duct 40A and flows into the dust removal chamber 31 via the inlet opening 40B.

[0209] The external air duct 40A advantageously extends substantially over the entire transverse width or at least 50% or 60% of the transverse width of the dust removal chamber 31 and / or the machine housing 15 in the region of the dust removal chamber 31 transversely to the longitudinal center plane 23.

[0210] While the dust removal connection 33 runs parallel or at an inclination of less than 30° degrees, preferably less than 20° degrees, even more preferably less than 10° degrees / to the longitudinal center plane 23, the external air inlet 40 runs transversely to the longitudinal center plane 23, for example approximately at a right angle transversely.

[0211] The arrangement of the external air inlet 40 is advantageously such that the external air F flowing into the external air inlet 40 flows through the dust removal chamber 31 in an almost completely rotary manner, picking up dust and particles, before flowing into the dust removal connection 33 as a dust air stream S. In any case, the dust air wheel 32 can convey the external air F flowing in through the external air inlet 40 through the almost complete dust removal chamber 31, namely in a rotary movement or flow movement flowing around the tool axis W, before the dust exhaust air stream S flows out of the dust removal chamber 31 through the dust removal connection 33.

[0212] A flow of external air F through the external air inlet 40 is particularly desirable when the suction hose 70A and thus the vacuum cleaner STA is connected. This avoids an undesirable negative pressure situation, i.e., a sufficient dust air flow S can always flow through the dust removal connection 33 without the vacuum cleaner STA or a flow measuring device or pressure measuring device present there detecting an excessive negative pressure, which would lead to the vacuum cleaner STA being switched off. If the vacuum cleaner STA delivers an insufficient dust air flow S, there is a risk that dust could enter the area around the hand-held power tool 10 or grinding machine 11 to an unacceptable extent. The vacuum cleaner STA should therefore be able to generate the dust air flow S as constantly as possible.

[0213] If, however, the dust collection device 70 is connected to the dust removal connection 33, the external air F flowing into the external air inlet 40 would reduce the conveying capacity of the dust air wheel 32, so that the dust air flow S could be too low. Therefore, it is advantageous to completely or at least partially close the external air inlet 40 when the dust collection device 70 is arranged at the dust removal connection 33.

[0214] The dust collection device 70 has a closure part 42A, which serves to close the external air inlet 40 and forms part of a closure device 41A.

[0215] The plug-in guide contour 80A and / or the anti-rotation contour 81 of the dust collection device 70 are advantageously formed or provided by the closure part 42A or are arranged on the closure part 42A. It is also possible for the closure part 42A to form the plug-in guide contour 80A and / or the anti-rotation contour 81.

[0216] When the dust collection device 70 is connected to the dust removal connection 33, the external air inlet 40 should be closed. The closure section 42A already reaches in front of the external air inlet 40 when the dust collection device 70 is plugged into the dust removal connection 33 and closes it. The closure section 42A has, for example, a wall-like shape and closes the external air inlet 40 when the dust collection device 70 is attached to the dust removal connection 33. At the same time, the closure section 42A forms the already indicated positive locking contour 56B, which represents the anti-rotation contour 81 or positive locking contour acting at least with respect to a rotation relative to the plug-in axis ST. Thus, the plug-in guide contour 80B on the external air inlet 40 forms a counter positive locking contour 36B for the positive locking contour 56B.

[0217] However, it is also advantageous, both in the embodiments illustrated in the drawings and in any grinding machine according to the invention, if a closure device for closing an external air inlet can be used independently of the connection of a dust collection container and / or if a closure device enables adjustment of the flow cross-section of the external air inlet, for example, by providing a type of control valve or comprising a control valve. With such a closure device, the external air inlet can not only be fully opened or fully closed, but also assume intermediate positions between an open position and a closed position.

[0218] Such greater flexibility with regard to closing an external air inlet is offered by a closure device 41B, which serves to close an external air inlet 140. The external air inlet 140, like the external air inlet 40, is arranged on the rear side 20 of the grinding machine 11. However, the external air inlet 140 extends approximately across a transverse width of the rear side 20 and penetrates the longitudinal center plane 23. The external air inlet 140 is open towards the underside 25 and / or in an orientation towards the machining surface 92 of the disk tool 90, and can therefore suck dust from the surroundings of the hand-held power tool 10 and the grinding machine 11 into the dust removal chamber 31. If, for example, dust remains on the workpiece surface WO when the grinding machine 11 is guided in the main working direction HA, this dust can be sucked in via the external air inlet 140. So there is a kind of “vacuum cleaner function” here.The external air inlet 140 can also be closed if necessary, for example, when using the dust collection device 70. For this purpose, a closure device 41B is provided, which has a closure member 42B suitable for closing the external air inlet 140 or for opening it. The closure member 42B is designed, for example, in the manner of a roller or formed by a rotating body 43. The closure member 42B is arranged next to the external air duct 40A or arranged on the external air duct 40A. Advantageously, the closure member 42B extends approximately over the entire longitudinal extent of the external air duct 40A.

[0219] The closure member 42B or the rotating body 43 is rotatably mounted on a bearing holder 44 of the machine housing 15, wherein it or it is adjustable between an open position OP, in which the external air inlet 140 is open, and a closed position SP, in which the external air inlet 140 is closed.

[0220] The closure member 42B has, for example, a cylindrical peripheral wall or closure wall 42C, which can be adjusted by rotating the closure member 42B in front of the inlet opening 40B, through which the external air F can flow into the receiving chamber 32A, wherein the closure wall 42C then closes the inlet opening 40B, and can be adjusted away from the inlet opening 40B, so that the inlet opening 40B is free for the flow of external air F. Intermediate positions of the closure member 42B are possible, in which the closure wall 42C only partially closes the inlet opening 40B.

[0221] When the closure member 42B is in the open position OP, external air F can flow through the closure member 42B through an inlet opening 42D and an outlet opening 42E. In this open position OP, the inlet opening 42D is opposite the external air duct 40A, and the outlet opening 42E is opposite the inlet opening 40B.

[0222] It should be mentioned that the closure member 42B can also assume, for example, intermediate positions between its open position OP and its closed position SP, so that the amount of external air F flowing through the external air inlet 140 can be adjusted.

[0223] The closure member 42B can also be referred to or viewed as a valve member of a control valve.

[0224] To actuate the rotating body 43 or the closure member 42B, an actuating element 45 configured in the manner of a handle can be provided, for example. The actuating element 45 has, for example, an actuating projection 45A that can be clamped with two fingers of an operator.

[0225] As an alternative to the actuating element 45, an actuating element 46 intended for actuation with a tool or auxiliary means may also be provided on the closure member 42B. The actuating element 46 has a slot 46A, which can be actuated, for example, with a screwdriver, a coin, or the like, in order to adjust the closure member 42B between its closed position SP and its open position OP.

[0226] The actuating elements 45 or 46 are preferably provided on an end face of the closure member 42B which is remote from the axis of rotation of the closure member 42B.

[0227] A further alternative for actuating the closure member 42B is a schematically illustrated motorized and / or electric and / or electrically driven actuator 47, for example, an electric motor, an electromagnet, or the like. The actuator 47 can be actuated or controlled, for example, by an electrical switch and / or a sensor 48. The sensor 48 is connected, for example, to a controller 120 of the hand-held power tool 10, which generates control commands, in particular for the actuator 47, based on signals from the sensor 48.

[0228] The sensor 48 detects, for example, the presence of the dust collection device 70 at the dust removal connection 33. Thus, if, for example, the dust collection device 70 is plugged into the dust removal connection 33, the sensor 48 can detect this and control the actuator 47 to move the closure member 42B into its closed position SP. The sensor 48 is, for example, a pressure sensor, an electrical switch, a proximity sensor, or the like. Of course, an RFID sensor, a magnet, a Hall sensor, an optical sensor, or the like can also be provided.

[0229] Furthermore, it is conceivable for a schematically illustrated actuating element 49, for example an actuating projection, to protrude from the closure member 42B, which can be actuated when the dust collection device 70 is connected to the dust removal connection 33 in order to actuate the closure member 42B toward its closed position SP. For example, a type of driving fork, into which a driving projection on the dust collection device 70 engages, is possible as the actuating element 49. Thus, it is also possible for the dust collection device 70 to carry the closure device 41B or the closure member 42B toward the open position OP when it is removed from the dust removal connection 33.

[0230] Placing the grinding machine 11 or hand-held power tool 10 on its upper side 24 is very easy, regardless of whether the dust collection device 70 is attached to the dust removal connection 33 or not. In both situations, the grinding machine 11 can be placed and supported with its upper side 24, for example, on the workpiece surface WO, without tipping sideways, for example, toward one of the long sides 21 or 22.

[0231] A support contour arrangement 28 is provided for this purpose. The support contour arrangement 28 comprises the handle section 17 and a support contour arranged on the free end region of the energy storage connection 26 or the handle 18, for example a projection 29. The projection 29 is provided at a transverse distance from the longitudinal center plane 23. Thus, when the grinding machine 11 or hand-held power tool 10 with the dust collection device 70, when this is fastened to the dust removal connection 33, is placed on its upper side 24 on the base, for example the workpiece surface WO, it is supported on the base or the workpiece surface WO with the handle section 17, the support contour or the projection 29 and a support contour 29A provided on an edge between the rear wall 75D and the side wall 75A of the dust collection container 75.

[0232] However, if the dust collection device 70 is removed from the dust removal connection 33, it is also possible to place or set down the machine housing 15 with its upper side 24 on the ground or the workpiece surface WO in a tilt-proof manner. The hand-held power tool 10 and / or the machine housing 15 then rests, for example, with the support contour 29, the handle section 17, and a support contour 29B at the free end region of the handle 18 on the ground or the workpiece surface WO.

[0233] The support contour pairings 29, 29B or 29, 29A are arranged on opposite sides of the longitudinal center plane 23 and also have a longitudinal distance with respect to the handle section 17, so that a stable three-point support of the hand-held power tool 10 or grinding machine 11 with and without the dust collection device 70 arranged on the machine housing 15 on the substrate or workpiece surface WO is always possible.

[0234] A bearing support 150 is provided to close the motor mount 16A or the motor mount space 16C providing the motor mount 16A. The bearing support 150 forms a cover 150A.

[0235] The bearing support 150 is designed, for example, as a wall body 157 or has a wall body 157.

[0236] The bearing support 150 or wall body 157 has, for example, a wall section or a wall 151 which closes the motor mount 16A or the motor mount space 16C.

[0237] The rotor 12B of the drive motor 12 is mounted on the motor shaft 12C. The motor shaft 12C is rotatably mounted relative to the machine housing 15 on a motor bearing 12D and a motor bearing 12E. The motor bearing 12D and the motor bearing 12E are arranged on opposite sides of the rotor 12B or the motor shaft 12C.

[0238] A bearing mount 16B for the motor mount 12D is arranged in the region of the upper side 24 of the machine housing 15 and / or on a side of the machine housing 15 opposite the tool holder 14. The bearing mount 16B is arranged, for example, on the motor mount 16A.

[0239] The motor bearing 12E is held on a bearing mount 155 of the bearing support 150. The bearing support 150 and / or the wall body 157 forms a support structure 160 that supports the bearing mount 155. The support structure 160 extends with a directional component parallel to the motor axis M in the direction of the tool holder 14.

[0240] The bearing support 155 is approximately centrally located on the bearing support 150 or the wall

[0241] 151. An annular bearing retaining element 156, for example made of steel or the like, is arranged in the bearing receptacle 155, which receives the motor bearing 12E. It would be readily possible to support the motor bearing 12E directly on the bearing receptacle 155, i.e., the bearing retaining element 156 would not be present.

[0242] Around the bearing support 155, the bearing carrier 150 has screw openings

[0243] 152, through which screws 153 can be inserted, which can be screwed into the machine housing 17. These screws 153, as well as form-fitting contours on the bearing support 150, which engage in a form-fitting manner with matching form-fitting contours of the machine housing 15, hold the bearing support 150 stationary relative to the machine housing 15. Thus, the motor bearing 12E is also stationary relative to the machine housing 15.

[0244] The screw openings 152 are arranged relatively close to the motor axis M. For example, the screw openings 152 are spaced from an outer circumference 161 of the bearing carrier 150 by an outer radial distance RA and from an inner circumference 162 of the bearing support 155 by an inner radial distance RI. It can be seen that the radial distances RA and RI differ only slightly from each other, for example, a maximum of 20% or 30% or at most 40%.

[0245] The bearing support 150 has a channel section 154 on a side facing the rear side 20 of the machine housing 15, in which the external air channel 40A is formed.

[0246] Furthermore, the receiving chamber 32A for the dust air wheel 32 is provided on a side of the bearing carrier 150 facing away from the motor receiving space 16C.

[0247] The wall 151 is, for example, curved or dome-shaped, so that it forms a bearing carrier receiving space 158 which forms the receiving chamber 32A and / or is suitable for receiving the dust air wheel 32.

[0248] The bearing support receiving space 158 or the receiving chamber 32A for the dust air wheel 32 is fluidly connected to the dust discharge connection 33. For example, the receiving chamber 32A is fluidly connected to the discharge connection pipe 34.

[0249] The bearing support 150 is made, for example, of metal or another solid or rigid material. Thus, the bearing support 150 can, for example, have receptacles 159 for supporting a protective body 38. The receptacles 159 are arranged, for example, on the outer circumference of the wall 151.

[0250] For example, locking projections 38A of the protective body 38 can engage into the receptacles 159. For example, the receptacles 159 comprise locking receptacles 159A for the locking projections 38A and / or, in particular, grooves 159B extending annularly around the motor axis M, into which annular retaining projections or retaining contours 38B of the protective body 38 can engage and engage when the protective body 38 is mounted on the bearing carrier 150.

[0251] The receptacles 159 are arranged, for example, on an outer peripheral wall 163 of the bearing support 150. The outer peripheral wall 163 is provided, for example, on an outer peripheral edge 164 or outer peripheral edge region 164R of the bearing support 150. The outer peripheral edge region 164R does not extend into the interior of the machine housing 15.

[0252] The support structure 160 forms a projection 165 or has a projection 165 that projects beyond the outer peripheral edge 164 of the bearing support 150. It can be seen, in particular, in Figure 10 that a longitudinal extension HE165 of the projection 165 parallel to the motor axis M is significantly greater than a longitudinal extension HE164 of the outer peripheral edge 164 or outer peripheral edge region 164R parallel to the motor axis M.

[0253] The protective body 38, indicated schematically in Figure 4 and shown somewhat reduced in size in Figure 7, serves to protect a radial outer circumference of the plate tool 90, for example a cushion of the plate tool 90. The protective body 38 protects the plate tool 90 in particular when working in inner corner areas if narrow sides or peripheral sides of the plate tool 90 would strike against an obstacle. The protective body 38 then strikes this obstacle so that the plate tool 90, which is arranged behind the protective body 38 with respect to the obstacle, is not damaged. The protective body 38 is designed, for example, in the manner of an annular or partially annular peripheral wall, an apron or the like.

[0254] The motor bearings 12D and 12E are preferably rolling bearings, in particular roller bearings or ball bearings.

[0255] Near the motor bearing 12E, the motor shaft 12C has a receiving element 12F, which is connected to the motor shaft 12C in a rotationally fixed manner or can be integral with the motor shaft 12C. The motor bearing 12E is designed, for example, to support the motor shaft 12C and / or the receiving element 12F and / or to mount it rotatably with respect to the motor axis M.

[0256] The receiving element 12F has a receptacle 12G in which the gear 13, for example in the form of the eccentric bearing 13A, is received. The eccentric bearing 13A or gear 13 is held by a holding body 12H, which is screwed to the receiving element 12F, for example by means of screws 121.

[0257] The eccentric bearing 13C is, for example, a rolling bearing, in particular a ball bearing or roller bearing. The eccentric bearing 13C is eccentric with respect to the motor axis M, with the tool axis W having an eccentric distance e from the motor axis M.

[0258] The tool holder 14, for example a bolt section 14C of the tool holder 14, is received, for example, on a holder 13B of the eccentric bearing 13A or gear 13, in particular in a press fit and / or by means of an adhesive bond and / or the like.

[0259] The tool holder 14 is designed for rotationally driving the plate tool 90 with respect to the tool axis W. The tool holder 14 comprises, for example, a rotationally driving section 14A, on the outer circumference of which a rotationally driving contour 14B is arranged. The rotationally driving contour 14B fits positively into a rotationally driving contour 96 on the drive holder 91 of the plate tool 90, so that the rotationally driving contours 14B and 96 as a whole can connect the plate tool 90 to the holding body 12H in a rotationally fixed manner with respect to the tool axis W.

[0260] Furthermore, the tool holder 14 has a screw holder 14D into which a fastening screw 98, which can be pushed through a through opening 99 of the plate tool 90, can be screwed, so that the plate tool 90 can be connected or is connected to the tool holder 14 in a tensile manner with respect to the tool axis W.

[0261] A cooling air wheel 60 is arranged between the dust air wheel 32 and the drive motor 12.

[0262] The cooling air wheel 60 is arranged between the drive motor 12 and the bearing support 150. The bearing support 150 separates the dust removal chamber 31 from the motor housing 16C. The bearing support 150 can also be referred to as a bulkhead or have a bulkhead that separates the dust removal chamber 31 from the motor housing 16C or separates the dust removal chamber 31 from the further interior of the machine housing 15.

[0263] The cooling air wheel 60 is connected to the motor shaft 12C in a rotationally fixed manner. The cooling air wheel 60 serves to generate a cooling air flow K, which flows into the machine housing 15 via inlet openings 15A, flows through the motor receiving space 16C, flows around and / or through the drive motor 12, and then flows out of the machine housing 15 via outlet openings 15B.

[0264] The inlet openings 15A are advantageously arranged apart and away from the tool holder 14 and thus from the plate tool 90, for example at the longitudinal end region of the handle 18.

[0265] The outflow openings 15B are advantageously arranged on the front side 19 of the machine housing 15 above the dust removal chamber 31 and / or in an outflow direction approximately corresponding to the main working direction HA, so that dust lying on the workpiece surface WO in the main working direction HA can be blown away by the cooling air flow K.

[0266] Advantageously, outlet openings 15B are also provided transversely to the main working direction HA. This measure advantageously reduces the flow resistance for the cooling air flow K and / or enables better air purging of the working area around the hand-held power tool 10.

[0267] The cooling air wheel 60 has a fan section 61. The fan section 61 comprises a supporting wall 62, from which fan blades 63 protrude and / or on which fan blades 63 are arranged.

[0268] The fan blades 63 can also be arranged, for example, on the motor axis

[0269] M spaced-apart annular supports 262, preferably having different diameters, which can be provided instead of the supporting wall 62 or in addition to the supporting wall 62. The supports 262 are shown schematically.

[0270] The supporting wall 62 protrudes from a holding section 64 of the cooling air wheel 60 or is arranged on the holding section 64.

[0271] The holding section 64 has a shaft receptacle 65, designed, for example, as a through-opening, for receiving the motor shaft 12C. The holding section 64 is designed, for example, as a cylindrical section or a holding cylinder.

[0272] Ribs 66 advantageously protrude from the holding section 64, which serve, for example, as support ribs and / or contribute to generating or directing the cooling air flow K. The ribs 66 are advantageously oriented parallel to the motor axis M. Flat sides of the ribs 66 advantageously extend parallel to the motor axis M.

[0273] The cooling air impeller 60 forms an axial-radial fan or diagonal fan. The fan blades 63 are inclined relative to the motor axis M.

[0274] The fan blades 63 have axial sections 63A and radial sections 63B.

[0275] The axial sections 63A can serve to ensure that the cooling air flow K flows through and around the drive motor 12. The axial sections 63A ensure an axial flow direction of the cooling air flow K approximately parallel to the motor axis M or along the motor axis M on an intake side of the cooling air wheel 60. The cooling air flow K is, so to speak, sucked in through the axial sections 63A.

[0276] The axial sections 63A of the fan blades 63 merge into the radial sections 63B in the manner of an interlacing.

[0277] The radial sections 63B advantageously ensure that the cooling air flow K is blown out or conveyed away radially with respect to the motor axis M, so that the cooling air flow K flows out of the motor accommodation space 16C via the outlet openings 15B. The axial sections 63A carry a volume of the cooling air flow K in the direction of the radial sections 63B.

[0278] With respect to the direction of rotation DR, the axial sections 63A are relatively gently inclined. With respect to the direction of rotation DR, the axial sections 63A preferably have an inclination of, for example, 30° to 50°, in particular an inclination of approximately 45°. The axial sections 63A preferably also have this inclination with respect to the motor axis M, which is simultaneously the axis of rotation of the cooling air wheel 60.

[0279] With respect to the direction of rotation DR, the axial sections 63A are inclined slightly flatter than the radial sections 63B.

[0280] The fan blades 63 have leading blade edges or leading edges 63C or leading edges in the direction of rotation DR and rear blade edges or trailing edges 63D or trailing edges in the direction of rotation DR.

[0281] The blade leading edge 63C is advantageously arranged in front of the blade trailing edge 63D in the direction of rotation DR.

[0282] For example, the leading edge 63C runs essentially radially to the motor axis M. The trailing edge 63D, on the other hand, runs essentially parallel to the motor axis M.

[0283] The fan blades 63, in particular the radial sections 63B, can also be provided to accelerate the cooling air flow K, in particular such that, for example, a high differential pressure can be generated, in particular in a diffuser of the hand-held power tool 10 that adjoins the radial sections and surrounds the cooling air wheel 60. For example, it is provided that an inlet flow cross-section 63E, which extends between fan blades 63 arranged one behind the other in the direction of rotation DR and / or adjacent thereto, between their inlet edges 63C, is larger than an outlet flow cross-section 63F, which is delimited, among other things, by the outlet edges 63D of these fan blades 63. The following description reveals measures due to which the grinding machine 11 is particularly compact with respect to its extension parallel to the tool axis W or motor axis M, even though it has a dust-generating air wheel 32 in its drive train 13B.

[0284] Furthermore, the cooling air wheel 60 and the bearing support 150 are preferably designed such that they can engage into a tapered section 16D of the machine housing 15. The drive motor 12, for example, is accommodated in the tapered section 16D. The tapered section 16D extends between the handle section 17 and the cover 30 and can, for example, be grasped by an operator. In particular, an operator's fingers can engage in the tapered section 16D when the operator's hand rests on the handle section 17. Furthermore, the reach-through opening 18A is arranged next to the tapered section 16D. Thus, the tapered section 16D advantageously contributes to an enlargement of the reach-through opening 18A.

[0285] The dome-like or approximately frustoconical wall 151, on the upper side of which the cooling air wheel 60 nestles, contributes to a particularly compact design and / or low construction with respect to the motor axis M or tool axis W.

[0286] It is advantageously provided that the mutually facing sides of the cooling air wheel 60 and the wall 151 are designed to match each other and / or have matching geometric shapes and / or contours.

[0287] Likewise adapted to the wall 151, namely to its underside, is the dust air wheel 32, which on its upper side facing the wall 151 also has a dome-like or approximately truncated cone-like contour at least on a section opposite the wall 151.

[0288] The cooling air wheel 60, in particular the supporting wall 62, has an overall approximately bell-shaped and / or dome-shaped and / or approximately truncated cone-shaped configuration. On a side of the supporting wall 62 facing away from the fan blades 63, the supporting wall 62 defines a cooling air wheel receiving space 67. The cooling air wheel receiving space 67 allows for the arrangement of multiple components.

[0289] For example, the bearing support 150 is at least partially arranged in the cooling air wheel receiving space 67. In particular, the wall section or the wall 151 extends into the cooling air wheel receiving space 67. Thus, a bulkhead separating the dust removal space 31 from the motor receiving space 16C in the form of the bearing support 150 is arranged in the cooling air wheel receiving space 67 or an interior space of the cooling air wheel 60.

[0290] The wall section or wall 151 has, at least in the region of the cooling air wheel receiving space 67, an approximately bell-shaped configuration corresponding to the shape of the supporting wall 62 in the region of the wall 151. For example, flat sides of the wall section or wall 151 and the supporting wall 62 lie flatly opposite one another.

[0291] Furthermore, the engine mount 12E is arranged in the cooling air wheel receiving space 67. The engine mount 12E is completely accommodated in the cooling air wheel receiving space 67. The engine mount 12E is held on a section of the bearing carrier 150 arranged in the cooling air wheel receiving space 67, namely on the bearing receptacle 155.

[0292] Furthermore, the gear 13 and / or the eccentric bearing 13A is at least partially accommodated in the cooling air wheel receiving space 67.

[0293] The holding body 12H, which holds the gear 13 or eccentric bearing 13A, is also at least partially accommodated in the cooling air wheel receiving space 67.

[0294] The holding body 12H and / or the gear 13 and / or the eccentric bearing 13A protrude at least partially in front of the cooling air wheel receiving space 67 on a side facing away from the drive motor 12. Nevertheless, a large part, for example approximately half, of the holding body 12H and / or the gear 13 and / or the eccentric bearing 13A extends parallel to the motor axis M into the cooling air wheel receiving space 67. Finally, a part of the dust air wheel 32 is also arranged in the cooling air wheel receiving space 67. For example, a holding section 32B of the dust air wheel 32 extends into the cooling air wheel receiving space 67. A fan section 32C, adjacent to the holding section 32B and on which fan blades 32D are arranged, protrudes in front of the cooling air wheel receiving space 67. The fan blades 32D serve to generate an air flow relative to the motor axis M or the tool axis W, which forms a component of the dust air flow S.

[0295] The dust air wheel 32 is held on the receiving element 12F in a rotationally fixed manner with respect to the motor axis M.

[0296] The dust air wheel 32 has a receptacle 32E for the receiving element 12F of the motor shaft 12C. The receiving element 12F passes through the receptacle 32E or is held in the receptacle 32E, in particular held in a rotationally fixed manner.

[0297] The receptacle 32E forms a dust air wheel receiving space 32G, for example for receiving the gear 13.

[0298] The dust air wheel 32 has a balancing section 32F, which serves, for example, to compensate for imbalances caused by the eccentric bearing of the tool holder 14.

[0299] The dust air wheel 32 further engages an interior space or a passage opening of an air guide body 37. The air guide body 37 is designed, for example, as a disc or as a disc-shaped body.

[0300] The air guide body 37 is sandwiched between the seal 31A and the bearing support 150. The seal 31A thus serves to hold the air guide body 37 to the bearing support 150.

[0301] The seal 31A is held to the bearing support 150, for example, with screws 32L. A cover body 39 is arranged on the bearing support 150 on a side facing away from the dust removal chamber 31. The cover body 39 has an annular plate portion 39A surrounding a through-opening 39C into which the wall portion or wall 151 engages.

[0302] A wall section 39B protrudes from the plate section 39A, which covers and closes the channel section 154.

[0303] Furthermore, the cooling air wheel 60 is also arranged in the passage opening 39C or engages in the passage opening 39C. The cover body 39, in particular the plate section 39A, also serves to direct the cooling air flow K. For example, the cooling air flow K can flow along a side of the plate section 39A facing away from the dust air wheel 60 and is directed from this side radially outward relative to the motor axis M in the direction of the outlet openings 15B.

[0304] Receptacles 39D are arranged on the plate section 39A, for example, on the side along which the cooling air flow K flows. Support ribs or support sections 15C of the machine housing 15 can engage positively in the receptacle 39D, so that the cover body 39 is held positively on the machine housing 15, for example, to prevent rotation relative to the motor axis M and / or to reinforce the machine housing 15.

[0305] The hand-held power tool 10 advantageously has a lighting device 100. The lighting device 100 comprises, for example, an annular support 101 on which lighting elements, in particular LEDs, are arranged.

[0306] The assembly of the lighting device 100 is simple in that the lighting device 100 is clamped between the cover body 39 and the air guide body 37. The cover body 39 and / or the air guide body 37 are preferably resiliently flexible, so that vibrations emanating, for example, from the drive train 13B have little or no effect on the lighting device 100. The lighting device 100 is fixed radially with respect to the motor axis M by means of the components holding it, for example, the cover body 39 and / or the air guide body 37 and / or the bearing support 150.

[0307] Advantageously, the lighting device 100 is received in a groove provided by the components holding it, for example the cover body 39 and / or the air guide body 37 and / or the bearing carrier 150.

[0308] Furthermore, the assembly is also very simple because the bearing support 150, when fastened to the machine housing 15 with the screws 153, fixes the components arranged between the bearing support 150 and the machine housing 15, including the cover body 39 and the air guide body 37, as well as the lighting device 100, which may be clamped between these two aforementioned bodies 39 and 37, with respect to the machine housing 15.

[0309] Using a connecting cable 102, the lighting device 100 can be connected to a controller 120 of the hand-held power tool 10, shown schematically in the drawing. A switch 103 is used to turn the lighting device 100 on and off. The switch 103 can be connected directly to the connecting cable 102 or to the controller 120.

[0310] The controller 120 is advantageously arranged in the handle 18. The controller 120 is expediently arranged between the inlet openings 15A and the drive motor 12, so that the cooling air flow K flowing in via the inlet openings 15A can cool the controller 120.

[0311] A further switch 121 is used to switch the drive motor 12 on and off. The switch 121 is advantageously arranged on the front side 19 of the machine housing 15, in particular directly below or next to the handle section 12, so that an operator can easily grasp and actuate the switch 121.

Claims

Claims 1. Grinding machine (11) with a machine housing (15) and a drive motor (12), in particular an electric one, arranged in the machine housing (15) for rotating and / or oscillatingly driving a tool holder (14) to which a disk tool (90) can be detachably fastened, wherein the drive motor (12) has a motor shaft (12C) mounted on at least one motor bearing (12E) relative to the machine housing (15) about a motor axis (M) and a cooling air wheel (60) having a holding section (64) by means of which the cooling air wheel (60) is connected in a movement-coupled or rotationally fixed manner to the motor shaft (12C) of the drive motor (12), wherein the cooling air wheel (60) is arranged between a stator (12A) of the drive motor (12) and the tool holder (14), wherein the cooling air wheel (60) has a fan section (61) extending with a directional component parallel to the motor axis (M) and having fan blades (63) for generating a cooling air flow, characterized in that the cooling air wheel (60) has, on its side facing away from the stator (12A) of the drive motor (12), between the fan blades (63) of the fan section (61) and the holding section (64), a cooling air wheel receiving space (67), which extends at a radial distance with respect to the motor axis (M) around a shaft receptacle (65) of the cooling air wheel (60) for the motor shaft (12C) provided on the holding section (64) or around a shaft body connected in a rotationally fixed manner to the motor shaft (12C), wherein a (15) stationary component and / or a drive component driven or drivable by the drive motor (12), which is arranged between the cooling air wheel (60) and the tool holder (14), engages in the cooling air wheel receiving space (67).

2. Grinding machine (11) according to claim 1, characterized in that the component held stationary on the machine housing (15) comprises a cover (150A) which completely or at least partially closes a motor receiving space (16C) in which the drive motor (12) is arranged.

3. Grinding machine (11) according to claim 2, characterized in that the cover (150A) separates the motor receiving space (16C) from a dust removal space (31) in which the tool holder (14), in particular the disc tool (90), is received, wherein the dust removal space (31) is provided and designed to extract dust from the disc tool (90).

4. Grinding machine (11) according to one of the preceding claims, characterized in that the component held stationary on the machine housing (15) has or is formed by a bearing carrier (150) with a bearing receptacle (155) for holding the at least one motor bearing (12E).

5. Grinding machine (11) according to one of the preceding claims, characterized in that the at least one drive component engaging in the cooling air wheel receiving space (67) comprises or is formed by the at least one motor bearing (12E).

6. Grinding machine (11) according to claim 5, characterized in that the at least one motor bearing (12E) arranged in the cooling air wheel receiving space (67) is arranged between the gear (13) or the eccentric bearing (13A) and the holding section (64) of the cooling air wheel (60).

7. Grinding machine (11) according to one of the preceding claims, characterized in that the cover (150A) or the bearing support (150) has a bearing support receiving space (158) for at least one drive component driven or drivable by the drive motor (12).

8. Grinding machine (11) according to one of the preceding claims, characterized in that the at least one drive component engaging in the cooling air wheel receiving space (67) and / or the bearing support receiving space (158) comprises or is formed by a dust air wheel (32) for generating a dust air flow, by means of which, during the machining of a workpiece by the Dust generated by the grinding machine (11) can be conveyed away from the disc tool (90).

9. Grinding machine (11) according to claim 8, characterized in that the dust air wheel (32) has a dust air wheel receiving space (32G) for the gear (13) and / or the eccentric bearing (13A), which is open in particular to the tool holder (14).

10. Grinding machine (11) according to claim 8 or 9, characterized in that the dust air wheel (32), in particular at least partially in the cooling air wheel receiving space (67), is firmly connected to the motor shaft (12C) or is coupled to the motor shaft by means of a rotational drive.

11. Grinding machine (11) according to one of the preceding claims, characterized in that the at least one drive component engaging in the cooling air wheel receiving space (67) and / or the bearing support receiving space (158) and / or the dust air wheel receiving space (32G) comprises or is formed by a gear (13) and / or an eccentric bearing (13A) for driving the tool holder (14).

12. Grinding machine (11) according to one of the preceding claims, characterized in that at least two receiving spaces of the cooling air wheel receiving space (67) and / or the bearing support receiving space (158) and / or the dust air wheel receiving space (32G) engage with one another and / or at least one receiving space of the cooling air wheel receiving space (67) and the bearing support receiving space (158) and the dust air wheel receiving space (32G) is arranged entirely or partially in another receiving space of the cooling air wheel receiving space (67) and the bearing support receiving space (158) and the dust air wheel receiving space (32G) or has a common cutting surface with this other receiving space and / or two components of the cooling air wheel (60) and the bearing support (150) and the dust air wheel (32) have, in particular, annular sections in a cutting plane through which the motor axis (M) passes vertically.

13. Grinding machine (11) according to one of the preceding claims, characterized in that a receptacle (12G) for the gear (13) or the eccentric bearing (13A) is at least partially or largely or entirely accommodated in the cooling air wheel accommodating space (67) and / or the bearing support accommodating space (158) and / or the dust air wheel accommodating space (32G), wherein the receptacle (12G) is arranged on the motor shaft (12C) or on a accommodating element (12F) arranged on the motor shaft (12C) in a rotationally fixed manner.

14. Grinding machine (11) according to one of the preceding claims, characterized in that the fan blades (63) are held between supports (262) of the cooling air wheel (60) which are spaced apart from one another with respect to the motor axis (M) and completely or at least partially delimit the cooling air wheel receiving space (67) on the circumference with respect to the motor axis (M).

15. Grinding machine (11) according to one of the preceding claims, characterized in that the fan section (61) has a supporting wall (62) on which the fan blades (63) are held and / or from which the fan blades (63) protrude, wherein the supporting wall (62) completely or at least partially surrounds the cooling air wheel receiving space (67) circumferentially with respect to the motor axis (M).

16. Grinding machine (11) according to one of the preceding claims, characterized in that the fan section (61), in particular the supporting wall (62), is inclined obliquely to the motor axis (M) in a plane in which the motor axis (M) runs and / or has a step contour.

17. Grinding machine (11) according to one of the preceding claims, characterized in that the cooling air wheel (60) and / or the cooling air wheel receiving space (67) and / or a wall surrounding the cooling air wheel receiving space (67), in particular a supporting wall (62) carrying the fan blades (63), and / or a side of the fan blades (63) facing the motor axis (M) and / or an envelope of the cooling air wheel (60) on its side facing the cooling air wheel receiving space (67) is bell-shaped with respect to the motor axis (M) and / or has at least one step.

18. Grinding machine (11) according to one of the preceding claims, characterized in that the fan blades (63) are inclined obliquely with at least one oblique inclination with respect to the motor axis (M), in particular in a vertical viewing direction laterally onto the motor axis (M) and / or with respect to a direction of rotation in which the cooling air wheel (60) rotates during operation of the grinding machine, or have sections inclined obliquely with at least one oblique inclination with respect to the motor axis (M), wherein the at least one oblique inclination with respect to the motor axis and / or the and / or the oblique inclination with respect to the direction of rotation is a maximum of 45 degrees, preferably a maximum of 40 degrees, even more preferably a maximum of 35 degrees, and / or a minimum of 5°, even more preferably a minimum of 10°, even more preferably a minimum of 15°.

19. Grinding machine (11) according to one of the preceding claims, characterized in that the cooling air wheel (60) in the region of the holding section (64) has a rib structure with a plurality of ribs, in particular oriented parallel to the motor axis (M) and / or designed as support ribs.

20. Grinding machine (11) according to one of the preceding claims or the preamble of claim 1, characterized in that the cooling air wheel (60) is designed as an axial-radial fan wheel or diagonal fan wheel. 21 . Grinding machine (11) according to one of the preceding claims, characterized in that the cooling air wheel (60) rotates in a direction of rotation (DR) during operation of the grinding machine and a portion of the cooling air flow (K) flows past a blade leading edge (63C) of a respective fan blade (63) in the direction of a blade trailing edge (63D) of the fan blade (63), wherein the blade leading edge (63C) is arranged behind the blade trailing edge (63D) in the direction of rotation (DR) and / or the fan blade (63) has at least one oblique inclination with respect to the direction of rotation (DR) between the blade trailing edge (63C) and the blade trailing edge (63D) and / or the blade leading edge (63C) extends radially with respect to the motor axis (M) or at an angle of maximum 30° to a radial direction and / or the blade trailing edge (63D) extends parallel to the motor axis (M) or at an angle of maximum 30° to a motor axis (M) extends cylindrically and / or a section of the blade trailing edge (63D) closer to the drive motor (12) is arranged in the direction of rotation (DR) in front of a section of the blade trailing edge (63D) further away from the drive motor (12).

22. Grinding machine (11) according to one of the preceding claims, characterized in that with respect to the motor axis (M) or in the direction of the motor axis (M), a height of the cooling air wheel receiving space (67) is at least 50%, preferably at least 60%, more preferably at least 70% of the total height of the cooling air wheel (60) and / or that the maximum area of a cross section of the cooling air wheel receiving space (67) through which the motor axis (M) passes vertically is at least 40%, preferably at least 50%, more preferably at least 60% of a maximum cross-sectional area of the entire cooling air wheel (60) through which the motor axis (M) passes vertically.

23. Grinding machine (11) according to the preamble of claim 1 or one of the preceding claims, characterized in that the cooling air wheel (60) is arranged at least partially in a waisted section (16D) of the machine housing (15), wherein the waisted section (16D) extends along the motor axis (M) between a section (16D) of the machine housing (15) having the tool holder (14) and a section (17) of the machine housing (15) opposite the tool holder (14) and protrudes less far than at least one of the sections (16D) in front of the motor axis (M).

24. Grinding machine (11) according to claim 23, characterized in that the fan section (61), in particular the fan blades (63), engages in the waisted section (16D) of the machine housing (15), in particular that an envelope of the fan blades (63) in a region engaging in the waisted section (16D) of the machine housing (15) has an outer peripheral contour (161) which correlates with an inner peripheral contour of the machine housing (15) or is adapted to the course of the inner peripheral contour.

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