Hand-held power tool

Abstract

The invention relates to a hand-held power tool, comprising a drive unit having a spindle unit, and a locking unit for locking the spindle unit, which is mounted in particular so as to be rotatable about a drive axis. According to the invention, the drive unit, in particular the spindle unit, can be oriented, in particular pre-centered, relative to the locking unit, in particular by means of magnetic force.

Description

Technical Field

[0001] The invention relates to a hand-held power tool according to the preamble of claim 1 . Background Art

[0002] DE 10 2013 212 250 A1 describes a spindle locking device having at least one locking unit, which includes at least one movably supported locking element for locking the spindle in at least one direction, and includes at least one operating element for operating the locking element, wherein the spindle locking device has a motion activation unit for pretensioning the locking element in the direction of a locking position of the locking element in an unoperated position of the operating element. Summary of the invention

[0003] The object of the present invention is to improve a hand-held power tool by means of simple structural measures.

[0004] This object is achieved by means of a hand-held power tool comprising a drive unit with a spindle unit and a spindle unit for locking, in particular rotatably mounted about a drive axis.

[0005] It is proposed that the drive unit, in particular the spindle unit, can be aligned, in particular pre-centered, relative to the locking unit, in particular by means of a magnetic force, preferably by means of a cogging torque.

[0006] The drive unit, in particular the spindle unit, can be oriented, in particular pre-centered, in particular with respect to the locking unit, in particular by means of magnetic force and / or mechanical force. When oriented or pre-centered by means of magnetic force, the drive unit, in particular the spindle unit, can be (pre-)adjusted by means of a cogging torque or a change in magnetic resistance according to the rotational position of the spindle unit (rotor) relative to the stator or the locking unit. When oriented by means of mechanical force, the drive unit, in particular the spindle unit, can be twisted by means of contact or force action through the locking unit. In particular, the drive unit, in particular the spindle unit, can be twisted in such a way that the locking unit can engage in the drive unit, in particular the spindle unit, or lock the drive unit, in particular the spindle unit.

[0007] The drive unit, in particular the spindle unit, can be oriented relative to the locking unit, in particular oriented or pre-centered such that the drive unit, in particular the spindle unit, can be brought from the unlocked state into the locked state by means of the locking unit, in particular while avoiding a different orientation of the drive unit, in particular the spindle unit.

[0008] As a handheld machine tool, a handheld and / or hand-guided handheld machine tool and preferably an electric planer or electric grinder are preferably considered. Of course, other handheld machine tools that seem meaningful to a person skilled in the art can also be considered. The handheld machine tool can have a drive unit for indirectly or directly driving an accessory device, preferably a drilling or milling tool, in particular a bolt-shaped accessory device. The drive unit can have a spindle unit that is movably supported, in particular around a drive axis. The spindle unit can have a drive shaft element and an output shaft element. The drive shaft element can be configured as a motor shaft. The drive shaft element can be connected to the output shaft element in a particularly torsionally fixed and / or form-locked and / or force-locked manner and / or coaxially arranged. The handheld machine tool can have a control or adjustment unit for controlling or adjusting the handheld machine tool, in particular the drive unit. The handheld machine tool can have a tool receiving portion for receiving an accessory device. The tool receiving portion can be rotatably supported around the output axis. The tool receiving portion can be driven by means of a drive unit, for example, in order to operate the accessory device. For this purpose, the handheld machine tool can have a transmission unit. The transmission unit can transmit the movement of the drive unit to the tool receiving part. In order to operate the handheld power tool, an operating element can be provided, which can be operated, in particular can be operated so as to put the handheld power tool, in particular the drive unit, into an operating state. In the operating state, for example, the drive unit can be put into the operating state, in particular to drive an accessory device.

[0009] A locking unit is to be understood in particular as a unit which locks the movement of the spindle unit, in particular by means of a form-locking and / or force-locking connection. The locking unit can limit the movement, in particular the rotational movement, of the spindle unit. The locking unit can, in particular in the locked state, completely surround the drive unit in a circumferential direction about the drive axis.

[0010] In particular, the hand-held power tool can have an orientation unit which orients the spindle unit relative to the locking unit, in particular by means of magnetic and / or mechanical forces.

[0011] As a result, the drive unit, in particular the spindle unit, can be aligned relative to the locking unit in a rest state (stationary) or non-driven state, such that the locking unit can be moved from the unlocked state into the locked state.

[0012] Conventional locking units have the disadvantage that the spindle unit must sometimes be oriented in a complex manner in order to be placed in the locked state from the unlocked state by means of the locking unit. Even when the locking unit of the spindle unit is oriented, it cannot be ensured that the spindle unit is placed in the locked state.

[0013] At present, the cogging torque of the drive unit should be utilized in order to be able to pre-center the spindle unit relative to the locking unit. In particular, the spindle unit should be pre-centered, in particular by means of the cogging torque, in such a way that the locking unit locks, in particular surrounds, the spindle unit without moving or twisting the spindle unit. The movement or twisting of the spindle unit can be limited to a predetermined angular range, within which the spindle unit can be locked by means of the locking unit. The angular range can vary within a tolerance range of, for example, up to + / - 4 degrees. In particular, in the case of spindle units with hexagonal receptacles, a good engagement of the locking unit with the spindle unit is achieved.

[0014] Cogging torques occur in particular in drive units with permanent magnets. In this case, the rotation of the spindle unit in the unexcited state induces a locking phenomenon, which produces a feeling of periodic jerky rotation.

[0015] The locking is formed by the attraction of the permanent magnets of the spindle unit, in particular each permanent magnet, in the direction of the tooth poles. The tooth poles are made of magnetic material and protrude toward the spindle unit. Here, the cogging torque is generated by the resultant torque of the spindle unit relative to the tooth poles. The magnitude and direction of the cogging torque are periodically related to the rotational position of the spindle unit relative to the drive stator. The period is determined according to the least common multiple of the number of magnetic poles (permanent magnets) and the number of tooth poles. For example, when four magnetic poles and six tooth poles are used, the period is 30 degrees (=360° / 12).

[0016] Depending on the rotational position, the drive unit has a periodic equilibrium position in which the net cogging torque T is zero and the torque in the clockwise direction balances the torque in the counterclockwise direction. The equilibrium position includes a stable equilibrium position and an unstable equilibrium position that alternate, for example, every 15 degrees.

[0017] If the spindle unit deflects in a position other than a stable or unstable equilibrium position, the cogging torque forces the spindle unit into the nearest stable equilibrium position.

[0018] Every drive unit (electromagnetic motor) with permanent magnets generates a cogging torque. In particular, permanent magnets with high magnetic force are used in brushless drive units in order to generate a large cogging torque.

[0019] The dependent claims reveal further advantageous developments of the hand-held power tool according to the invention.

[0020] It can be expedient for the drive unit, in particular the spindle unit, to be arranged in a position oriented relative to the locking unit in the rest state. The rest state is to be understood in particular as an equilibrium position of the drive unit, in particular the spindle unit, relative to the drive stator. As a result, the rest state of the drive unit or the spindle unit can be oriented toward the locking unit in order to optimally position the spindle unit for the locking unit and to enable the locking state to be realized in a correspondingly simple manner.

[0021] Furthermore, it may be expedient for the drive unit, in particular the spindle unit, to be arranged in a plurality of stationary states in a position oriented relative to the locking unit, wherein more than 30%, in particular more than 40%, preferably more than 45%, advantageously more than 50% of the stationary states of the drive unit, in particular the spindle unit, are arranged in a position oriented relative to the locking unit.

[0022] Furthermore, it may be expedient for the drive unit, in particular the spindle unit, to be arranged in a plurality of stationary states in a position to be oriented relative to the locking unit, wherein more than 30%, in particular more than 40%, preferably more than 45%, advantageously more than 50% of the stationary states of the drive unit, in particular the spindle unit, are arranged in the position to be oriented relative to the locking unit.

[0023] Furthermore, it may be expedient for the drive unit, in particular the spindle unit, to have 12 rest states. In particular, the drive unit, in particular the spindle unit, is arranged in an oriented position in 6 of the 12 rest states. Preferably, the drive unit, in particular the spindle unit, is arranged in a position to be oriented in 6 of the 12 rest states.

[0024] Furthermore, it can be expedient for the drive unit, in particular the spindle unit or the drive stator, to have a permanent magnet. In particular, a permanent magnet is a body around which a magnetic field is generated and maintained for a long time. Preferably, the permanent magnet is made of a material, such as iron, cobalt, nickel, certain ferrites or alloys or a combination thereof. A permanent magnet can maintain a magnetic field, in particular a permanent magnetic field, without consuming electrical power. A permanent magnet can have one or more north and south poles on its surface. Of course, a person skilled in the art selects the permanent magnet used for the purpose of the present invention.

[0025] This ensures that the spindle unit is aligned in a predefined position relative to the locking unit.

[0026] Furthermore, it can be expedient for the drive unit, in particular the drive stator or the spindle unit, to comprise a laminated core with winding slots, wherein the winding slots extend parallel and / or linearly relative to the drive axis. The drive stator and / or the spindle unit can have a single or multiple winding slots. The winding slots can be configured to receive electrical conductors, such as in particular insulated wires or litz wires to form coils. Of course, the winding slots can be provided to form a single or multiple pole shoes. The pole shoes have a high magnetic permeability. The pole shoes can be provided to allow the magnetic field lines to flow out and be distributed in a defined form by means of permanent magnets or windings. As a result, the excitation field can be distributed to the drive rotor in a circular segment shape through the pole shoes.

[0027] It may be expedient for the drive unit, in particular the drive stator or the spindle unit, to have 4, 6, 8, 10, 12 or 18 winding slots.

[0028] Furthermore, it can be expedient if the spindle unit has flat regions for limiting the movement of the spindle unit in the locked state of the locking unit. In particular, the number of flat regions is smaller than the number of drive units.

[0029] Furthermore, it may be expedient for the flat region to have a flat surface. The flat surface may be delimited in the circumferential direction about the drive axis by a first delimiting edge and a second delimiting edge.

[0030] In addition, it is proposed that the spindle unit has a flat area for limiting the movement of the spindle unit in the locked state of the locking unit. In particular, the flat area has a flat surface. The surface can be bounded by an inner limiting circle around the drive axis, especially in a radial direction relative to the drive axis. The surface can be bounded by an outer limiting circle around the drive axis, especially in a radial direction relative to the drive axis. The surface can be bounded by a first radial plane and a second radial plane in a circumferential direction around the drive axis. The first radial plane can have an angle greater than 35°, particularly greater than 40°, preferably greater than 50°, advantageously greater than 60°, particularly preferably greater than 80°, and / or less than 150°, particularly less than 110°, preferably less than 90°, advantageously less than 70°, particularly preferably less than 50° with the second radial plane.

[0031] The flat region can be formed on the spindle unit, in particular on the output shaft element.

[0032] It is proposed that the flat region has two, four, six or eight flat surfaces. These flat surfaces can be arranged one after another. In each case two mutually adjacent surfaces can be bounded by a common limiting edge in the circumferential direction. The flat surfaces can form a quadrangular, hexagonal or octagonal receiving portion.

[0033] The number of flat regions can be less than the number of winding slots in the drive stator. Ideally, the spindle unit can have a number of flat regions that correspond to the number of winding slots. The cogging torque is related to the number of slots on the stator.

[0034] Furthermore, it is proposed that in the stationary state of the drive unit, in particular the spindle unit, the flat region, in particular the flat surface of the flat region, is oriented substantially parallel to the movement axis of the locking unit. In the oriented position, the flat region, in particular the flat surface of the flat region, is arranged parallel to the movement axis of the locking unit.

[0035] It may be expedient for the locking unit to have a locking element which is mounted movably relative to the spindle unit in a direction transverse to, in particular perpendicular to, the spindle unit. The movement axis of the locking element may intersect the drive axis and may in particular be arranged perpendicular to the axis.

[0036] It may be expedient if the locking unit has a locking element which has a first locking region and a second locking region which is angled with respect to the first locking region.

[0037] Furthermore, it may be expedient if the first locking region has a first locking edge, which is in particular a straight line, and the second locking region has a second locking edge, which is in particular a straight line, wherein the first locking edge is at an angle to the first locking edge.

[0038] Furthermore, it may be expedient for the locking element to be mounted so that it can move relative to the spindle unit along a movement axis which is arranged transversely, in particular perpendicularly, to the drive axis.

[0039] Furthermore, it may be expedient if a section transversely, in particular perpendicularly, to the axis of movement intersects the locking element, in particular the first locking region.

[0040] It is proposed that the spindle unit has a flat region for limiting the movement of the spindle unit in the locked state of the locking unit.

[0041] Furthermore, it may be expedient for the flat region to have a flat surface which is delimited in a circumferential direction about the drive axis by a first limiting edge and a second limiting edge, wherein the first limiting edge in the locked state abuts against the first locking region and / or the second limiting edge in the locked state abuts against the second locking region.

[0042] It is further proposed that the flat region has a flat surface which is bounded by an inner and outer bounding circle about the drive axis, wherein the locking element, in particular the first locking region, is arranged in the unlocked state, in particular viewed along the axis of movement (BA), at a height between the inner and outer bounding circle. In the unlocked state, a section transversely, in particular perpendicularly, to the axis of movement can intersect the first locking region and the flat region, in particular the second flat surface of the flat region, of the spindle unit.

[0043] It may be expedient if the outer limiting circle has an outer diameter relative to the maximum movement of the locking element along the movement axis that is greater than 1, in particular greater than 1.2, preferably greater than 1.4, advantageously greater than 1.6, particularly preferably greater than 1.8, and / or less than 2.2, in particular less than 2.0, preferably less than 1.8, advantageously less than 1.6.

[0044] Furthermore, it can be expedient if the flat region has a flat surface which, in the locked state, is overlapped by the locking unit in the circumferential direction about the drive axis by less than 60%, in particular less than 50%, preferably less than 60%, advantageously less than 40%, particularly preferably less than 30%. This makes it possible to achieve a particularly compact locking unit, in that the spindle unit or the flat region is movably mounted only in the overlap required to ensure the locked state, so that large translational movements can be omitted.

[0045] Furthermore, it can be expedient if the spindle unit is mounted in the locked state so that it can rotate within an angular range of, in particular, more than 5°, preferably more than 10°, advantageously more than 15°, particularly preferably more than 20°, and / or in particular less than 50°, preferably less than 45°, advantageously less than 40°, particularly preferably less than 35°. This makes it possible to achieve a particularly compact locking unit.

[0046] It is proposed that the locking unit has a further locking element which has a first locking region and a second locking region which is angled with respect to the second locking region.

[0047] Furthermore, it is proposed that the locking element and the further locking element are arranged on two sides that lie opposite one another.

[0048] In a development of the invention, it is provided that in the driven state of the spindle unit the locking unit is arranged relative to the spindle unit, in particular to its rotational direction, so that a changeover of the locking unit from the unlocked state into the locked state is prevented and / or damage is reduced.

[0049] In particular, when the drive unit is currently in the driving state, the locking unit may be manipulated, for example, due to incorrect operation (misuse) of the handheld power tool. Here, due to the driving state of the drive unit, the spindle unit, in particular the flat area, may collide with the locking unit, in particular the locking element. Here, depending on the rotation direction of the spindle unit, the recoil is applied to the locking unit in the form of a reverse pulse against the axis of motion of the locking unit, or the impact or pulse is applied substantially transversely, in particular perpendicularly, to the axis of motion of the locking unit. In the first case, the locking unit is only "thrown back" and vibrates when the locking unit is continuously manipulated. Here, due to the force acting against the axis of motion, the locking unit only returns to the unlocked state. In the latter case, on the contrary, the spindle unit may be "stuck" into the locking unit due to the force and the locking unit may be damaged accordingly. This may deteriorate the locking function of the locking unit.

[0050] It can be expedient for the locking unit to have a retraction element for retracting the locking unit, in particular in the driven state of the spindle unit. It can be expedient for the retraction element to be arranged on the locking unit so that during the operating state of the spindle unit, a changeover of the locking unit from the unlocked state to the locked state is prevented. It can be expedient for the retraction element to extend transversely, in particular perpendicularly, to the axis of motion of the spindle unit. In particular, the retraction element is designed as a stop. It can thereby be ensured that the torque of the spindle unit leads to a movement of the retraction element counter to the axis of motion.

[0051] It may be expedient for the locking unit to have a first locking element. It may be expedient for the locking unit to have a second locking element. Preferably, the first locking element is arranged relative to the second locking element. Preferably, the retraction element is arranged on the first locking element. In particular, the retraction element limits the first locking element, in particular along the axis of movement of the locking unit. Preferably, the retraction element and the first locking element are designed in one piece. This allows a particularly compact design.

[0052] It can be expedient for the first locking element and the second locking element to be spaced differently relative to the spindle unit, in particular along the axis of movement. It can be expedient for the first locking element to have a first distance relative to the spindle unit in the unlocked state. It can be expedient for the second locking element to have a second distance relative to the spindle unit, in particular the axis. It can be expedient for the second distance to be greater than the first distance. It can be expedient for the second locking element to be retracted relative to the first locking element along the axis of movement of the locking unit. This can ensure that the rotational movement of the spindle unit stops against the retraction element.

[0053] Currently, the rotational movement of the drive unit is provided only in one direction of rotation.

[0054] It can be expedient if, in the locked state, the movement of the spindle unit in the direction of movement, in particular the direction of rotation, is limited by the first locking region. It can be expedient if, in the locked state, the movement of the spindle unit counter to the direction of movement, in particular the direction of rotation, is limited by the second locking region. In particular, the first locking region is angled relative to the second locking region. Preferably, the first locking region is arranged substantially between the return element and the second locking region. This allows, on the one hand, a separation of functions and, on the other hand, a safe locking function of the locking unit to be achieved in a particularly compact and reliable manner.

[0055] It may be expedient for the spindle unit, in particular the axis of the spindle unit, to be arranged in the locked state between a first locking element, in particular the first locking region of the first locking element, and a second locking element, in particular the first locking region of the second locking element.

[0056] It may be expedient if the first locking region of the first locking element is spaced apart from the first locking region of the second locking element, in particular along the movement axis of the locking unit. In particular, the first locking region of the first locking element is arranged parallel to the first locking region of the second locking element.

[0057] It can be expedient if the spindle unit comprises a flat region with a plurality of faces, wherein the locking element is arranged in the locked state, in particular viewed along the axis of movement, essentially between a first face and a further face facing away from the first face, in particular the maximum extension of the face. The first face and the further face can be arranged on sides of the spindle unit facing away from each other. In particular, the first face is arranged parallel to and / or spaced apart from the further face. This allows a particularly compact design of the locking unit to be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Further advantages are derived from the following description of the drawings. Embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain features in a number of combinations. It will also be appropriate for a person skilled in the art to consider the features individually and combine them into other meaningful combinations. Here is shown:

[0059] Figure 1 : A stereoscopic view of a handheld machine tool;

[0060] Figure 2 : A three-dimensional view of another handheld machine tool;

[0061] Figure 3 : A three-dimensional view of the spindle unit;

[0062] Figure 4 : Figure 3 A sectional view of the spindle unit;

[0063] Figures 5 to 9 : A cross-sectional view of a handheld machine tool;

[0064] FIG. 10 : Two exemplary cross-sectional views of a locking unit;

[0065] Fig.11 : Two further cross-sectional views of the locking unit;

[0066] Fig.12 : Another cross-sectional view of the locking unit.

[0067] In the following figures, identical components are provided with the same reference numerals. DETAILED DESCRIPTION

[0068] exist Figure 1 and Figure 2 1 shows a handheld machine tool 11 for manual or hand-operated workpiece processing. The handheld machine tool 11 is handheld and / or hand-guided as an electric planer ( Figure 2 ) or electric grinder ( Figure 1 ). Of course, other portable power tools 11 that seem meaningful to a person skilled in the art can also be considered. The portable power tool 11 has a drive unit 13 for indirectly or directly driving a bolt-shaped and / or disc-shaped accessory device (not shown), preferably a drilling or milling tool. The drive unit 13 has a spindle unit 15 movably supported around a drive axis A, the spindle unit having a drive shaft element 17 configured as a motor shaft and an output shaft element 19 configured as a tool receiving portion 21. The drive shaft element 17 is connected to the output shaft element 19 in a rotationally fixed and / or form-locked and / or force-locked manner and is arranged coaxially with the output shaft element. The portable power tool 11 has a control or regulating unit for controlling or regulating the drive unit 13. The portable power tool 11 has a tool receiving portion 21 for receiving an accessory device, which is rotatably supported around the output axis. The tool receiving portion 21 can be constructed to be driven by the drive unit 13 in order to operate the accessory device. The handheld power tool 11 may have a transmission unit (not shown or not present) for transmitting the movement of the drive unit 13 to the tool receiving part 21. For operating the handheld power tool 11, an operating element 23 is provided, which can be operated, in particular can be operated so as to put the handheld power tool 11, in particular the drive unit 13, into an operating state. In the operated state, the drive unit 13 is put into an operating state in order to drive an accessory device.

[0069] The handheld power tool 11 has a locking unit 27 for locking the spindle unit 15 rotatably supported about the drive axis A. The locking unit 27 locks the movement of the spindle unit 15 by means of a positive connection between the locking unit 27 and the spindle unit 15. The locking unit 27 limits the rotational movement of the spindle unit 15 in the locked state. The locking unit 27 completely surrounds the drive unit 13 in the circumferential direction U about the drive axis A in the locked state.

[0070] The spindle unit 15 can be oriented or pre-centered relative to the locking unit 27. The spindle unit 15 can be oriented or pre-centered relative to the locking unit 27 by means of magnetic forces and / or mechanical forces. The spindle unit 15 is oriented or pre-centered relative to the locking unit 27 in such a way that the spindle unit 15 can be brought from an unlocked state into a locked state by means of the locking unit 27 while avoiding a further orientation of the spindle unit 15. The spindle unit 15 is arranged in a position oriented relative to the locking unit 27 in the stationary state.

[0071] The spindle unit 15 is arranged in a plurality of resting states in a position oriented relative to the locking unit 27, wherein 50% of the resting states of the spindle unit 15 are arranged in a position oriented relative to the locking unit 27 ( Figure 6 to Figure 7 ).

[0072] The spindle unit 15 is arranged in a plurality of resting states in a position to be oriented relative to the locking unit 27, wherein 50% of the resting states of the spindle unit 15 are arranged in the position to be oriented relative to the locking unit 27 ( Figure 5 ).

[0073] The spindle unit 15 has 12 rest states. In 6 of the 12 rest states, the spindle unit 15 is arranged in an oriented position and in 6 of the 12 rest states, it is arranged in a position to be oriented.

[0074] The spindle unit 15 has a permanent magnet 101. The permanent magnet 101 maintains a permanent magnetic field. Of course, a person skilled in the art selects the permanent magnet used for the purpose of the present invention.

[0075] The drive stator or spindle unit 15 has a laminated core with a plurality of winding slots 103 , wherein the winding slots, in particular each winding slot, extend parallel and straight relative to the drive axis A. The winding slots 103 are designed to receive electrical conductors known to those skilled in the art, such as in the form of insulated wires, to form coils.

[0076] The drive stator or spindle unit 15 has 4, 6, 8, 10, 12 or 18 winding slots 103 .

[0077] The spindle unit 15 has a flat region 31 for limiting the movement of the spindle unit 15 in the locked state of the locking unit 27 .

[0078] The flat region 31 has a flat surface 35 which is delimited in the circumferential direction U about the drive axis A by a first delimiting edge 87 and a second delimiting edge 89 .

[0079] The flat region 31 has a flat surface 35 which is bounded in a radial direction relative to the drive axis A by an inner bounding circle 91 and an outer bounding circle 93 about the drive axis A. The surface 35 is bounded in a circumferential direction U about the drive axis A by a first radial plane RE1 and a second radial plane RE2. The first radial plane RE1 has an angle of 60° with respect to the second radial plane RE2.

[0080] The flat region 31 is formed on the spindle unit 15 or on the output shaft element 19 .

[0081] The flat region 31 has 2, 4, 6 or 8 flat surfaces 35 arranged one behind the other. In each case two adjacent surfaces 35 are delimited by a common delimiting edge in the circumferential direction U. The flat surfaces 35 form a hexagonal receptacle.

[0082] The number of flat regions 31 is smaller than the number of winding slots 103 in the drive stator.

[0083] In the stationary state of the spindle unit 15, the two flat surfaces 35 of the flat region 31 are oriented substantially parallel to the movement axis BA of the locking unit 27. In the oriented position, the two flat surfaces 35 of the flat region 31s are arranged parallel to the movement axis BA of the locking unit 27. In the non-oriented position, each flat surface 35 of the flat region 31s is angled relative to the movement axis BA of the locking unit 27.

[0084] The locking unit 27 has a locking element 45 which is mounted movably relative to the spindle unit 15 in a direction perpendicular to the spindle unit 15. A movement axis BA of the locking element 45 intersects the drive axis A and is arranged perpendicular thereto.

[0085] The locking unit 27 has a locking element 45 which has a first locking region 47 and a second locking region 49 which is angled relative to the first locking region 47 .

[0086] The first locking region 47 has a first locking edge 47a which is designed as a straight line, and the second locking region 49 has a second locking edge 49a which is designed as a straight line. The first locking edge 47a is at an angle with respect to the second locking edge 49a.

[0087] The locking element 45 is mounted so as to be movable relative to the spindle unit 15 along a movement axis BA arranged perpendicular to the drive axis A.

[0088] In every rotational position of the spindle unit 15 , a section plane perpendicular to the movement axis BA intersects the locking element 45 in the unlocked state, in particular the first locking region 47 and the flattened region.

[0089] The spindle unit 15 has a flat region 31 for limiting the movement of the spindle unit 15 in the locked state of the locking unit 27 .

[0090] The flat region 31 has a flat surface 35 which is delimited by a first delimiting edge 61 and a second delimiting edge 63 in the circumferential direction U about the drive axis A. The first delimiting edge 61 abuts against the first locking region 47 in the locked state ( Figure 8 ), and the second limiting edge 63 abuts against the second locking area 49 in the locked state ( Fig. 9 ).

[0091] The flattened region 31 has a flat surface 35 which is bounded by an inner bounding circle 91 and an outer bounding circle 93 about the drive axis A. The first locking region 47 is arranged in the unlocked state at a height between the inner bounding circle 91 and the outer bounding circle 93, as viewed along the axis of movement (BA). A section (S) transversely, in particular perpendicularly, to the axis of movement can intersect the first locking region and the flattened region of the spindle unit, in particular the two flat surfaces of the flattened region, in the unlocked state.

[0092] The outer limiting circle 93 has an outer diameter of approximately 1.8 in relation to the maximum movement of the locking element 45 along the movement axis BA.

[0093] In the locked state, the flat region 31 has a flat surface 35 which is overlapped by the locking unit 27 in the circumferential direction U about the drive axis A by less than 40%.

[0094] In the locked state, the spindle unit 15 is mounted so that it can rotate within an angular range of approximately 35°.

[0095] The locking unit 27 has another locking element 71, which has a first locking area and a second locking area angled relative to the second locking area. The locking element 45 and the other locking element 71 are arranged on two sides opposite to each other. Preferably, the first locking element is arranged opposite to the other locking element or the second locking element.

[0096] In the driving state of the spindle unit, the locking unit is arranged in such a way relative to the rotation direction of the spindle unit that the locking unit is prevented from switching from the unlocked state to the locked state and damage is reduced. The locking unit has a retraction element 81 for returning the locking unit in the driving state of the spindle unit. The retraction element 81 is arranged on the locking unit in such a way that the locking unit is prevented from switching from the unlocked state to the locked state during the operating state of the spindle unit. The retraction element 81 extends substantially perpendicular to the axis of motion of the spindle unit. The retraction element 81 is configured as a stop. The retraction element 81 is arranged on the first locking element and delimits the first locking element along the axis of motion BA of the locking unit. The retraction element 81 and the first locking element are constructed in one piece.

[0097] In particular, if the drive unit is actuated, for example, due to incorrect operation (misuse) of the hand-held power tool while the drive unit is rotating, the spindle unit, in particular the flat region, can collide with the locking unit, in particular the locking element, due to the drive state of the drive unit. Depending on the direction of rotation of the spindle unit, a recoil in the form of a return pulse can be applied to the locking unit in the opposite direction to the axis of motion of the locking unit or an impact or pulse can be applied substantially transversely, in particular perpendicularly, to the axis of motion of the locking unit. In the first case, the locking unit is merely "thrown back" and vibrates ( Fig.10a). In this case, the locking unit is only returned to the unlocked state due to the force acting against the axis of motion. In the latter case, on the other hand, the spindle unit can be "stuck" into the locking unit due to the force acting and the locking unit can be damaged accordingly ( Fig.10b ). Therefore, care should be taken to ensure that the locking unit is correctly mounted relative to the spindle unit. In particular, when using a Poka Yoke, incorrect mounting should be prevented, so that the locking unit has an asymmetrically constructed tongue element, which should prevent incorrect mounting. The tongue element can be coupled to a C-shaped actuating element, which only receives the tongue element when the tongue element is correctly in the correct position ( Fig.11 ).

[0098] The first locking element and the second locking element are spaced differently relative to the spindle unit along the axis of movement. In the unlocked state, the first locking element has a first distance from the spindle unit and the second locking element has a second distance from the spindle unit toward the axis, wherein the second distance is greater than the first distance. Here, the second locking element is moved back relative to the first locking element along the axis of movement of the locking unit.

[0099] In the present case, the rotational movement of the drive unit is provided only in the direction of rotation D.

[0100] In the locked state, the movement of the spindle unit in the direction of rotation D is limited by the first locking area. In the locked state, the movement of the spindle unit against the direction of rotation D is limited by the second locking area. The first locking area of ​​the first locking element is angled relative to the second locking area. The first locking area is arranged substantially between the return element 81 and the second locking area.

[0101] In the locked state, the axis A of the spindle unit 13 is arranged between the first locking region of the first locking element 47 and the first locking region of the second locking element 75 .

[0102] The first locking area 47 of the first locking element 45 is spaced apart from the first locking area 75 of the second locking element 71 along the movement axis BA of the locking unit 27. The first locking area 47 of the first locking element 45 is arranged parallel to the first locking area 75 of the second locking element 71.

[0103] The spindle unit comprises a flat region with a plurality of faces, wherein the locking element is arranged in the locked state, in particular viewed along the axis of movement BA, essentially between a first face and a further face facing away from the first face, in particular the maximum extension of the face. The first face and the further face can be arranged on sides of the spindle unit facing away from each other. In particular, the first face is arranged parallel to the further face and / or spaced apart. This allows a particularly compact design of the locking unit to be achieved.

[0104] Fig.12A section through a spindle unit is shown. The section shows the tooth poles of the drive stator and the permanent magnets 101 of the spindle unit. In this case, the rest position RP is arranged parallel to the axis of movement BA.

[0105] exist Fig.12a The arrangement of the drive stator relative to the spindle unit corresponds to Fig.12 The arrangement.

[0106] exist Figure 12b and Fig.12c In FIG. 1 , the rest position RP is pivoted by +30 degrees and -30 degrees relative to the movement axis BA.

Claims

1. A handheld machine tool, comprising: a drive unit (13) having a spindle unit (15), and a locking unit (27) for locking the spindle unit (15), in particular a spindle unit which is rotatably mounted about a drive axis (A), It is characterized in that the drive unit (13), in particular the spindle unit (15), can be aligned, in particular pre-centered, relative to the locking unit (27), in particular by means of a magnetic force, preferably by means of a cogging torque.

2. The handheld power tool according to claim 1, characterized in that The drive unit (13), in particular the spindle unit (15), is arranged in a stationary state in a position oriented relative to the locking unit (27).

3. The hand-held power tool according to claim 1, characterized in that The drive unit (13), in particular the spindle unit (15), is arranged in a plurality of stationary states in a position oriented relative to the locking unit (27), wherein more than 30%, in particular more than 40%, preferably more than 45%, advantageously more than 50% of the stationary states of the drive unit (13), in particular the spindle unit (15), are arranged in a position oriented relative to the locking unit (27).

4. The hand-held power tool according to claim 1, characterized in that The drive unit (13), in particular the spindle unit (15), is arranged in a plurality of stationary states in a position to be oriented relative to the locking unit (27), wherein more than 30%, in particular more than 40%, preferably more than 45%, advantageously more than 50% of the stationary states of the drive unit (13), in particular the spindle unit (15), are arranged in a position to be oriented relative to the locking unit (27).

5. The hand-held power tool according to claim 1, characterized in that The spindle unit (15) has a permanent magnet (101).

6. The hand-held power tool according to claim 1, characterized in that The spindle unit (15) has a flat area (31) for limiting the movement of the spindle unit (15) in the locked state of the locking unit (27), wherein the flat area (31) has a flat surface (35) which is bounded by an inner limiting circle (91) and an outer limiting circle (93) around the drive axis (A), wherein the locking element (45), in particular the first locking area (47), is arranged at a height between the inner limiting circle (91) and the outer limiting circle (93) when viewed along the movement axis (BA) in the unlocked state.

7. The hand-held power tool according to claim 1, characterized in that The outer limiting circle (93) has an outer diameter relative to the maximum movement of the locking element (45) along the movement axis (BA) that is greater than 1, in particular greater than 1.2, preferably greater than 1.4, advantageously greater than 1.6, particularly preferably greater than 1.8, and / or less than 2.2, in particular less than 2.0, preferably less than 1.8, advantageously less than 1.

6.

8. The hand-held power tool according to claim 1, characterized in that The flat region (31) has a flat surface (35) which is overlapped by the locking unit (27) in a circumferential direction (U) around the drive axis (A) by less than 60%, in particular less than 50%, preferably less than 40%, particularly preferably less than 30%.

9. The hand-held power tool according to claim 1, characterized in that The spindle unit (15) is supported in a locked state so as to be rotatable within an angular range of, in particular, greater than 5°, preferably greater than 10°, advantageously greater than 15°, particularly preferably greater than 20°, and / or in particular less than 50°, preferably less than 45°, advantageously less than 40°, particularly preferably less than 35°.

10. The hand-held power tool according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that The locking unit (27) has a locking element (45) having a first locking area (47) and a second locking area (49) which is angled relative to the first locking area (47).

11. The hand-held power tool according to claim 1, characterized in that The locking unit (27) has a further locking element (71) having a first locking area (73) and a second locking area (75) which is angled relative to the first locking area (73), wherein the locking element (45) and the further locking element (71) are arranged on opposite sides of each other.

12. The hand-held power tool according to the preamble of claim 1, in particular according to any one of the preceding claims, characterized in that The locking unit (27) is arranged relative to the spindle unit (15), in particular relative to the rotational direction of the spindle unit (15), in a driven state of the spindle unit (15) so as to prevent the locking unit (27) from switching from an unlocked state to a locked state and / or to reduce damage.

13. The handheld power tool according to claim 1, characterized in that The locking unit (27) has a retraction element (81) for retracting the locking unit (27), in particular in a driven state of the spindle unit (15), wherein the retraction element (81) is arranged on the locking unit so as to prevent the locking unit from switching from an unlocked state to a locked state during an operating state of the spindle unit, wherein the retraction element (81) extends transversely to, in particular perpendicularly to, an axis of movement (BA) of the spindle unit (27).

14. The hand-held power tool according to claim 1, characterized in that The locking unit (27) has a first locking element (45) and a second locking element (71) which is arranged in particular opposite the first locking element (45), wherein the first locking element (45) and the second locking element (71) are spaced differently relative to the spindle unit (15).

15. The hand-held power tool according to claim 1, characterized in that In the locked state, the movement of the spindle unit (15) along the movement direction, in particular the rotational direction, is limited by the first locking area (47), and / or in the locked state, the movement of the spindle unit (15) opposite to the movement direction, in particular the rotational direction, is limited by the second locking area (49), and / or the spindle unit (35), in particular the axis (A) of the spindle unit (35), in the locked state is arranged between the first locking element (45), in particular the first locking area (47) of the first locking element (45), and the second locking element (71), in particular the first locking area (75) of the second locking element (71).

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