Hand-held power tool

Abstract

The invention relates to a hand-held power tool with a drive unit which comprises a spindle unit, and with a locking unit for locking a spindle unit which is mounted, in particular, rotatably about a drive axis. It is proposed that the drive unit, in particular the spindle unit, can be oriented, in particular can be precentred, with respect to the locking unit, in particular by means of a magnetic force.

Description

[0001] Description

[0002] The invention relates to hand-held power tools according to the preamble of claim 1.

[0003] State of the art

[0004] DE 10 2013 212 250 A1 describes a spindle locking device with at least one locking unit, which comprises at least one movably mounted locking element for locking a spindle in at least one direction and which comprises at least one operating element for actuating the locking element, wherein the spindle locking device has a movement activation unit for pre-tensioning the locking element in an unactuated position of the operating element in the direction of a locking position of the locking element.

[0005] Disclosure of the invention

[0006] The invention is based on the object of improving a hand-held power tool using simple design measures.

[0007] The object is achieved with a hand-held power tool having a drive unit comprising a spindle unit and having a locking unit for locking a spindle unit, in particular one mounted so as to be rotatable about a drive axis.

[0008] 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 locking torque.

[0009] In particular, 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 and / or a mechanical force. When aligned or pre-centered by means of a magnetic force, the drive unit, in particular the spindle unit, can be (pre-)adjusted by means of a cogging torque or a change in the magnetic resistance depending on the rotational position of the spindle unit (rotor) relative to the stator or the locking unit. When aligned by means of a mechanical force, the drive unit, in particular the spindle unit, can be rotated by means of a contact or a force applied by the locking unit. In particular, the drive unit, in particular the spindle unit, can be rotated in such a way that the locking unit can engage with the drive unit, in particular the spindle unit, or lock it.

[0010] The drive unit, in particular the spindle unit, can be aligned with respect to the locking unit, in particular aligned or pre-centered in such a way that the drive unit, in particular the spindle unit, can be moved from an unlocked state to a locked state by means of the locking unit, in particular while avoiding further alignment of the drive unit, in particular the spindle unit.

[0011] A handheld and / or hand-guided power tool, and preferably an electric planer or an electric grinder, is preferably considered as a handheld power tool. It goes without saying that other handheld power tools that appear appropriate to a person skilled in the art are also considered. The handheld power tool can have a drive unit for directly or indirectly driving an accessory device, in particular a bolt-shaped one, preferably a drilling or milling tool. The drive unit can have a spindle unit, in particular one that is movably mounted about a drive axis. The spindle unit can have a drive shaft element and an output shaft element. The drive shaft element can be designed as a motor shaft. The drive shaft element can be connected to the output shaft element, in particular in a rotationally fixed and / or positively locking and / or non-positively locking manner, and / or can be arranged coaxially.The handheld power tool can have a control or regulating unit for controlling or regulating the handheld power tool, in particular the drive unit. The handheld power tool can have a tool holder for receiving an accessory device. The tool holder can be rotatably mounted about an output axis. The tool holder can be driven by means of the drive unit, for example in order to operate the accessory device. For this purpose, the handheld power tool can have a gear unit. The gear unit can transmit a movement of the drive unit to the tool holder. To operate the handheld power tool, an actuating element can be provided which can be actuated, in particular actuated in such a way as to put the handheld power tool, in particular the drive unit, into an operating state.In an actuated state, for example, the drive unit can be placed into an operating state, in particular to drive the accessory device.

[0012] A locking unit is understood, in particular, to be a unit that blocks a movement of the spindle unit, in particular by means of a positive and / or non-positive connection. The locking unit can limit a movement, in particular a rotational movement, of the spindle unit. The locking unit can surround the drive unit, in particular in a locked state, in the circumferential direction around the drive axis, in particular completely.

[0013] In particular, the hand-held power tool can have an alignment unit which aligns the spindle unit relative to the locking unit, in particular by means of a magnetic and / or mechanical force.

[0014] As a result, the drive unit, in particular the spindle unit, can be aligned relative to the locking unit in a resting state (stationary) or non-driven state such that the locking unit can be moved from an unlocked state to a locked state. Conventional locking units have the disadvantage that a spindle unit must sometimes be aligned, which is complex, in order to be moved from an unlocked state to a locked state by means of the locking unit. Even with a locking unit that aligns the spindle unit, there is no guarantee that the spindle unit will be moved into a locked state.

[0015] In this case, the cogging torques of the drive unit are to be used to pre-center the spindle unit relative to the locking unit. In particular, the spindle unit is to be pre-centered, particularly by means of the cogging torques, in such a way that the locking unit locks the spindle unit, in particular engages around it, without moving or twisting the spindle unit. 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 up to approximately + / - 4 degrees. In particular, a spindle unit with a hexagon socket results in good engagement between the locking unit and the spindle unit.

[0016] Cogging torque is particularly evident in a drive unit with a permanent magnet. Rotating the spindle unit in a non-energized state induces the cogging phenomenon, which creates the sensation of periodic, unsteady rotation.

[0017] The locking action is caused by the attraction of each permanent magnet of the spindle unit towards the tooth poles. The number of poles is made of magnetic material and protrudes towards the spindle unit. The locking torque results from the resulting torque of the spindle unit relative to the tooth poles. The magnitude and direction of the locking torque periodically depend on the rotational position of the spindle unit relative to the drive stator. A period is determined by the lowest common multiple of the number of magnetic poles (permanent magnets) and the number of tooth poles. For example, the period is 30 degrees (= 360° / 12) when four magnetic poles and six tooth poles are used.Depending on the rotational position, the drive unit has periodic equilibrium positions in which the net cogging torque T is zero and the clockwise torque balances the counterclockwise torque. The equilibrium positions include stable equilibrium positions and unstable equilibrium positions, which alternate, for example, every 15 degrees.

[0018] If the spindle unit is deflected in a position other than the stable or unstable equilibrium positions, the cogging torque forces the spindle unit into the nearest stable equilibrium positions.

[0019] Every drive unit with permanent magnets (magnetic motors) generates a cogging torque. Brushless drive units, in particular, use permanent magnets with a high magnetic force to generate a greater cogging torque.

[0020] The subclaims specify further expedient developments of the hand-held power tool according to the invention.

[0021] It may be expedient for the drive unit, in particular the spindle unit, to be arranged in a position aligned with the locking unit in a rest state. A rest state is understood to mean, in particular, an equilibrium position of the drive unit, in particular the spindle unit, relative to a drive stator. This allows the rest state of the drive unit or spindle unit to be aligned with the locking unit in order to optimally position the spindle unit for the locking unit and thus easily achieve a locked state.

[0022] It may further be expedient for the drive unit, in particular the spindle unit, to be arranged in a position aligned with the locking unit in a plurality of rest states, wherein more than 30%, in particular more than 40%, preferably more than 45%, preferably more than 50%, of the rest states of the drive unit, in particular the spindle unit, are arranged in a position aligned with the locking unit. It may furthermore be expedient for the drive unit, in particular the spindle unit, to be arranged in a position aligned with the locking unit in a plurality of rest states, wherein more than 30%, in particular more than 40%, preferably more than 45%, preferably more than 50%, of the rest states of the drive unit, in particular the spindle unit, are arranged in a position aligned with 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 aligned position in 6 of the 12 rest states. Preferably, the drive unit, in particular the spindle unit, is arranged in a position to be aligned in 6 of the 12 rest states.

[0024] It may further be expedient for the drive unit, in particular the spindle unit or a drive stator, to have a permanent magnet. In particular, a permanent magnet is a body that generates a magnetic field in its surroundings and maintains it over a long period of time. The permanent magnet is preferably made of a material such as iron, cobalt, nickel, certain ferrites, or an alloy or a combination thereof. The permanent magnet can maintain a magnetic field, in particular a permanent one, without having to consume electrical power. The permanent magnet can have one or more north and south poles on its surface. It is understood that a person skilled in the art will select the permanent magnets used for the purpose of the present invention.

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

[0026] Furthermore, it may be expedient for the drive unit, in particular the drive stator or the spindle unit, to have a laminated core with a winding slot, wherein the winding slot extends parallel and / or rectilinearly to the drive axis. The drive stator and / or the spindle unit can have a single or a plurality of winding slots. The winding slots can be designed to receive an electrical conductor, such as a wire, in particular an insulated wire, or a stranded wire, to form a coil. It is understood that the winding slots can be provided to form a single or a plurality of pole shoes. The pole shoe has a high permeability. The pole shoe can be provided to allow magnetic field lines to emerge and distribute them in a defined shape by means of a permanent magnet or a winding.This allows a magnetic excitation field to be distributed in a circular segment shape onto the drive rotor by a pole shoe.

[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 may be expedient for the spindle unit to have a flat area to limit movement of the spindle unit when the locking unit is in a locked state. In particular, the number of flat areas is smaller than the number of the drive unit.

[0029] Furthermore, it may be expedient for the flat area to have a flat surface. The flat surface can be bounded in the circumferential direction around the drive axis by a first boundary edge and a second boundary edge.

[0030] It is further proposed that the spindle unit have a flat region for limiting a movement of the spindle unit when the locking unit is in a locked state. In particular, the flat region has a flat surface. The surface can be limited, in particular in the radial direction to the drive axis, by an inner limiting circle around the drive axis. The surface can be limited, in particular in the radial direction to the drive axis, by an outer limiting circle around a drive axis. The surface can be limited in the circumferential direction around the drive axis by a first radial plane and by a second radial plane.The first radial plane may have an angle of more than 35°, in particular more than 40°, preferably more than 50°, preferably more than 60°, particularly preferably more than 80°, and / or less than 150°, in particular less than 110°, preferably less than 90°, preferably less than 70°, particularly preferably less than 50°, to the second radial plane.

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

[0032] It is proposed that the flat area have two, four, six, or eight flat surfaces. The flat surfaces can be arranged side by side. Any two adjacent surfaces can be bounded in the circumferential direction by a common boundary edge. The flat surfaces can form a square, hexagon, or octagonal receptacle.

[0033] The number of flat areas can be smaller than the number of winding slots in the drive stator. Ideally, the spindle unit can have a number of flat areas that corresponds to the number of winding slots. Cogging torques depend on the number of slots on the stator.

[0034] It is further proposed that the flat region, in particular a flat surface of the flat region, be aligned substantially parallel to a movement axis of the locking unit in a rest state of the drive unit, in particular the spindle unit. In an aligned position, the flat region, in particular a flat surface of the flat region, is arranged parallel to a / the movement axis of the locking unit.

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

[0036] It may be expedient for the locking unit to have a locking element with a first locking region and a second locking region angled relative to the first locking region. Furthermore, it may be expedient for the first locking region to have a first locking edge, in particular a straight one, and for the second locking region to have a second locking edge, in particular a straight one, wherein the first locking edge is angled relative to the second locking edge.

[0037] Furthermore, it may be expedient for the locking element to be movably mounted relative to the spindle unit along a movement axis which is arranged transversely, in particular perpendicularly, to the drive axis.

[0038] Furthermore, it may be expedient for a cut transversely, in particular perpendicularly, to the movement axis to cut the blocking element, in particular the first blocking area.

[0039] It is proposed that the spindle unit has a flat area for limiting a movement of the spindle unit in a locking state of the locking unit.

[0040] Furthermore, it may be expedient for the flat region to have a flat surface which is delimited in the circumferential direction around the drive axis by a first boundary edge and by a second boundary edge, wherein the first boundary edge abuts the first blocking region in a blocking state and / or the second boundary edge abuts the second blocking region in a blocking state.

[0041] It is further proposed that the flat region has a flat surface delimited by an inner limiting circle and an outer limiting circle around a drive axis, wherein the locking element, in particular the first locking region, is arranged at a height between the inner limiting circle and the outer limiting circle in an unlocked state, in particular viewed along a movement axis (BA). A section transverse, in particular perpendicular, to the movement axis can intersect the first locking region and the flat region, in particular two flat surfaces of the flat region, of the spindle unit in an unlocked state.It may be expedient for the outer boundary circle to have an outer diameter relative to a maximum movement of the blocking element along the movement axis of greater than 1, in particular greater than 1.2, preferably greater than 1.4, preferably greater than 1.6, particularly preferably greater than 1.8, and / or of less than 2.2, in particular less than 2.0, preferably less than 1.8, preferably less than 1.6.

[0042] Furthermore, it may be expedient for the flat area to have a flat surface which, in a locked state, is overlapped by the locking unit in the circumferential direction around the drive axis by less than 60%, in particular less than 50%, preferably less than 40%, and particularly preferably less than 30%. This allows a particularly compact locking unit to be achieved by movably mounting the spindle unit or the flat area only in the overlap required to ensure the locked state, thus eliminating the need for a large displacement movement.

[0043] Furthermore, it may be expedient for the spindle unit to be rotatably mounted in a locked state within an angular range of, in particular, more than 5°, preferably more than 10°, preferably more than 15°, particularly preferably more than 20°, and / or in particular less than 50°, preferably less than 45°, preferably less than 40°, particularly preferably less than 35°. This allows for a particularly compact locking unit to be achieved.

[0044] It is proposed that the locking unit has a further locking element with a first locking area and a second locking area angled relative to the second locking area.

[0045] It is further proposed that the locking element and the further locking element are arranged on two opposite sides.

[0046] In a further development of the invention, it is proposed that the locking unit is arranged in a drive state of the spindle unit relative to the spindle unit, in particular a direction of rotation of the spindle unit, in such a way that a transfer of the locking unit from an unlocked state to a locked state is prevented and / or damage is reduced.

[0047] Particularly in a drive unit in a drive state, the locking unit may be actuated, for example due to incorrect operation (misuse) of the handheld power tool. Due to the drive state of the drive unit, the spindle unit, in particular the flat area, may strike the locking unit, in particular a locking element. Depending on the direction of rotation of the spindle unit, either a recoil in the form of a return impulse can be exerted on the locking unit counter to the movement axis of the locking unit, or an impact or impulse can be exerted essentially transversely, in particular perpendicularly, to the movement axis of the locking unit. In the first case, the locking unit is merely "thrown back," and rattling occurs upon continued actuation of the locking unit. In this case, the locking unit is simply returned to the unlocked state due to the force acting counter to the movement axis.In the latter case, however, the spindle unit can "eat into" the locking unit due to the force exerted, causing damage. This can impair the locking function of the locking unit.

[0048] It may be expedient for the locking unit to have a return element for returning the locking unit, in particular when the spindle unit is in a drive state. It may be expedient for the return element to be arranged on the locking unit in such a way that a transition of the locking unit from an unlocked state to a locked state during an operating state of the spindle unit is prevented. It may be expedient for the return element to extend transversely, in particular perpendicularly, to a movement axis of the spindle unit. In particular, the return element is designed as a stop. This can ensure that a torque of the spindle unit leads to a movement of the return element counter to the movement axis. 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 opposite the second locking element. Preferably, the return element is arranged on the first locking element. In particular, the return element delimits the first locking element, in particular along a movement axis of the locking unit. Preferably, the return element and the first locking element are formed integrally. This allows for a particularly compact design.

[0049] It may be expedient for the first locking element and the second locking element to be spaced apart from the spindle unit at different distances, in particular along the movement axis. It may be expedient for the first locking element to be at a first distance from the spindle unit in an unlocked state. It may be expedient for the second locking element to be at a second distance from the spindle unit, in particular from an axis. It may be expedient for the second distance to be greater than the first distance. It may be expedient for the second locking element to be set back from a first locking element along a movement axis of the locking unit. This can ensure that a rotational movement of the spindle unit strikes against the return element.

[0050] In this case, a rotational movement of the drive unit is only intended in one direction of rotation.

[0051] It may be expedient for a movement of the spindle unit in a locked state in the direction of movement, in particular in the direction of rotation, to be limited by a first locking region. It may be expedient for a movement of the spindle unit in a locked state counter to the direction of movement, in particular counter to the direction of rotation, to be limited by a 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 the functions and, on the other hand, a secure locking function of the locking unit to be achieved in a particularly compact and reliable manner.

[0052] It may be expedient for the spindle unit, in particular an axis of the spindle unit, to be arranged in a locked state between the first locking element, in particular a first locking region of the first locking element, and the second locking element, in particular a first locking region of the second locking element.

[0053] It may be expedient for the first locking region of the first locking element to be spaced apart from the first locking region of the second locking element, particularly along a 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.

[0054] It may be expedient for the spindle unit to have a flat region with a plurality of surfaces, wherein the locking elements, in a locked state, in particular viewed along the movement axis, are arranged substantially between a first surface and a further surface facing away from the first surface, in particular a maximum extent of these surfaces. The first surface and the further surface can be arranged on mutually opposite sides of the spindle unit. In particular, the first surface is arranged parallel to the further surface and / or arranged at a distance from it. This allows a particularly compact design of the locking unit to be achieved.

[0055] Short description of the drawings

[0056] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also conveniently consider the features individually and combine them into useful further combinations. Here, Fig. 1 shows a perspective view of a hand-held power tool.

[0057] Fig. 2 is a perspective view of another

[0058] hand tool,

[0059] Fig. 3 is a perspective view of a spindle unit,

[0060] Fig. 4 is a sectional view through the spindle unit from Fig. 3 and

[0061] Fig. 5 to 9 each show a sectional view through the hand tool,

[0062] Fig. 10 two exemplary sectional views through the locking unit,

[0063] Fig. 11 two further sectional views through the locking unit,

[0064] Fig. 12 further sectional views through the locking unit.

[0065] In the following figures, identical components are provided with the same reference numerals.

[0066] Fig. 1 and Fig. 2 show a hand-held power tool 11 for manually machining a workpiece. The hand-held power tool 11 is designed as an electric planer (Fig. 2) or an electric grinder (Fig. 1) and is hand-held and / or hand-guided. It is understood that other hand-held power tools 11 that would be deemed appropriate by a person skilled in the art are also suitable. The hand-held power tool 11 has a drive unit 13 for directly or indirectly driving an accessory device (not shown), in particular a bolt-shaped and / or disc-shaped accessory device, preferably a drilling or milling tool. The drive unit 13 has a spindle unit 15 that is movably mounted about a drive axis A and that has a drive shaft element 17 designed as a motor shaft and an output shaft element 19 designed as a tool holder 21.The drive shaft element 17 is connected to the output shaft element 19 in a rotationally fixed and / or form-fitting and / or force-fitting manner and is arranged coaxially therewith. The handheld power tool 11 has a control or regulating unit for controlling or regulating the drive unit 13. The handheld power tool 11 has a tool holder 21 for receiving an accessory device, which is mounted rotatably about an output axis. The tool holder 21 is designed to be drivable by means of the drive unit 13 in order to operate the accessory device. The handheld power tool 11 can have a gear unit (not shown or not present) for transmitting a movement of the drive unit 13 to the tool holder 21. To operate the handheld power tool 11, an actuating element 23 is provided, which can be actuated, in particular actuated in such a way as to put the handheld power tool 11, in particular the drive unit 13, into an operating state.In an actuating state, the drive unit 13 is placed in an operating state to drive the accessory device.

[0067] The handheld power tool 11 has a locking unit 27 for locking a spindle unit 15 mounted for rotation about a drive axis A. The locking unit 27 locks movement of the spindle unit 15 by means of a positive connection of the locking unit 27 to the spindle unit 15. The locking unit 27 limits rotational movement of the spindle unit 15 in a locked state. In a locked state, the locking unit 27 completely surrounds the drive unit 13 in the circumferential direction U around the drive axis A.

[0068] The spindle unit 15 can be aligned or pre-centered relative to the locking unit 27. The spindle unit 15 can be aligned or pre-centered relative to the locking unit 27 by means of a magnetic and / or mechanical force. The spindle unit 15 is aligned or pre-centered relative to the locking unit 27 in such a way that the spindle unit 15 can be moved from an unlocked state to a locked state by means of the locking unit 27, avoiding further alignment of the spindle unit 15.

[0069] In a rest state, the spindle unit 15 is arranged in a position aligned with the locking unit 27.

[0070] The spindle unit 15 is arranged in a position aligned with the locking unit 27 in a plurality of rest states, wherein 50% of the rest states of the spindle unit 15 are arranged in a position aligned with the locking unit 27 (Figs. 6 to 7).

[0071] The spindle unit 15 is arranged in a position to be aligned with the locking unit 27 in a plurality of rest states, with 50% of the rest states of the spindle unit 15 being arranged in a position to be aligned with the locking unit 27 (Fig. 5). The spindle unit 15 has 12 rest states. The spindle unit 15 is arranged in an aligned position in 6 of the 12 rest states and in a position to be aligned in 6 of the 12 rest states.

[0072] The spindle unit 15 includes a permanent magnet 101. The permanent magnet 101 maintains a permanent magnetic field. It is understood that a person skilled in the art will select the permanent magnets used for the purpose of the present invention.

[0073] The drive stator or spindle unit 15 has a laminated core with a plurality of winding slots 103, wherein the, in particular each, winding slot extends parallel and rectilinearly to the drive axis A. The winding slots 103 are designed to receive an electrical conductor known to a person skilled in the art, such as in the form of an insulated wire to form a coil.

[0074] The drive stator or spindle unit 15 has 4, 6, 8, 10, 12 or 18 winding slots 103.

[0075] The spindle unit 15 has a flat area 31 for limiting a movement of the spindle unit 15 in a locked state of the locking unit 27.

[0076] The flat area 31 has a flat surface 35 which is delimited in the circumferential direction U around the drive axis A by a first boundary edge 87 and by a second boundary edge 89.

[0077] The flat region 31 has a flat surface 35, which is delimited in the radial direction to the drive axis A by an inner limiting circle 91 and an outer limiting circle 93 around a drive axis A. The surface 35 is delimited in the circumferential direction U around the drive axis A by a first radial plane RE1 and by a second radial plane RE2. The first radial plane RE1 forms an angle of 60° with the second radial plane RE2. The flat region 31 is formed on the spindle unit 15 or the output shaft element 19.

[0078] The flat area 31 has 2, 4, 6, or 8 flat surfaces 35 arranged side by side. Each two adjacent surfaces 35 are bounded in the circumferential direction U by a common boundary edge. The flat surfaces 35 form a hexagonal receptacle.

[0079] A number of flat areas 31 is smaller than a number of winding slots 103 in the drive stator.

[0080] In a resting state of the spindle unit 15, two flat surfaces 35 of the flat area 31 are aligned substantially parallel to a movement axis BA of the locking unit 27. In an aligned position, two flat surfaces 35 of the flat area 31s are arranged parallel to one / the movement axis BA of the locking unit 27. In a non-aligned position, each flat surface 35 of the flat area 31s is angled relative to the movement axis BA of the locking unit 27.

[0081] The locking unit 27 has a locking element 45, which is movably mounted relative to the spindle unit 15 in a direction perpendicular to the spindle unit 15. The movement axis BA of the locking element 45 intersects a drive axis A and is arranged perpendicular to this drive axis A.

[0082] The locking unit 27 has a locking element 45 with a first locking area 47 and with a second locking area 49 angled relative to the first locking area 47.

[0083] The first locking region 47 has a linear first locking edge 47a, and the second locking region 49 has a linear second locking edge 49a. The first locking edge 47a is angled relative to the second locking edge 49a. The locking element 45 is movably mounted relative to the spindle unit 15 along a movement axis BA, which is arranged perpendicular to the drive axis A.

[0084] A section perpendicular to the movement axis BA intersects the locking element 45, in particular the first locking region 47, and the flat region in an unlocked state in each rotational position of the spindle unit 15.

[0085] The spindle unit 15 has a flat area 31 for limiting a movement of the spindle unit 15 in a locked state of the locking unit 27.

[0086] The flat region 31 has a flat surface 35, which is delimited in the circumferential direction U around the drive axis A by a first boundary edge 61 and by a second boundary edge 63. The first boundary edge 61 abuts the first blocking region 47 in a locked state (Fig. 8) and the second boundary edge 63 abuts the second blocking region 49 in a locked state (Fig. 9).

[0087] The flat area 31 has a flat surface 35, which is delimited by an inner limiting circle 91 and an outer limiting circle 93 around a drive axis A. The first locking area 47, when viewed along a movement axis (BA) in an unlocked state, is arranged at a height between the inner limiting circle 91 and the outer limiting circle 93. A cut (S) transverse, in particular perpendicular, to the movement axis can intersect the first locking area and the flat area, in particular two flat surfaces of the flat area, of the spindle unit in an unlocked state.

[0088] The outer limiting circle 93 has an outer diameter of approximately 1.8 relative to a maximum movement of the locking element 45 along the movement axis BA.

[0089] In a locked state, the flat area 31 has a flat surface 35, which overlaps the locking unit 27 in the circumferential direction U around the drive axis A by less than 40%. In a locked state, the spindle unit 15 is mounted for rotation within an angular range of approximately 35°.

[0090] The locking unit 27 has a further locking element 71 with a first locking region and a second locking region angled relative to the second locking region. The locking element 45 and the further locking element 71 are arranged on two opposite sides. Preferably, the first locking element is arranged opposite the further or second locking element.

[0091] In a drive state of the spindle unit, the locking unit is arranged relative to a direction of rotation of the spindle unit in such a way that a transition of the locking unit from an unlocked state to a locked state is prevented and damage is reduced. The locking unit has a return element 81 for returning the locking unit in a drive state of the spindle unit. The return element 81 is arranged on the locking unit in such a way that a transition of the locking unit from an unlocked state to a locked state during an operating state of the spindle unit is prevented. The return element 81 extends substantially perpendicular to the movement axis of the spindle unit. The return element 81 is designed as a stop. The return element 81 is arranged on the first locking element and delimits the first locking element along a movement axis BA of the locking unit.The return element 81 and the first locking element are formed in one piece.

[0092] In particular, if the drive unit actuates the locking unit, for example due to incorrect operation (misuse) of the handheld power tool while the drive unit is rotating, the spindle unit, in particular the flat area, can strike the locking unit, in particular a locking element, due to the drive state of the drive unit. Depending on the direction of rotation of the spindle unit, either a recoil in the form of a return impulse counter to the movement axis of the locking unit or an impact or impulse essentially transverse, in particular perpendicular, to the movement axis of the locking unit can be exerted on the locking unit. In the first case, the locking unit is merely "thrown back" and, if the locking unit is continued to be actuated, a rattling noise occurs (Fig. 10a). In this case, the locking unit is merely returned to the unlocked state due to the force acting counter to the movement axis.In the latter case, however, the spindle unit can "eat into" the locking unit due to the force acting on it, thereby damaging it (Fig. 10b). Therefore, proper installation of the locking unit relative to the spindle unit is essential. In particular, Poka Yoke is used to prevent incorrect installation, so the locking unit features an asymmetrically designed tongue element to prevent incorrect installation. The tongue element can be coupled to the C-shaped actuating element, which only engages the tongue element when it is correctly positioned (Fig. 11).

[0093] The first locking element and the second locking element are spaced apart from the spindle unit at different distances along the movement axis. In an unlocked state, the first locking element is spaced apart from the spindle unit by a first distance, and the second locking element is spaced apart from the spindle unit by a second distance from an axis, the second distance being greater than the first distance. The second locking element is set back from a first locking element along a movement axis of the locking unit.

[0094] In this case, a rotational movement of the drive unit is only intended in one direction of rotation D.

[0095] A movement of the spindle unit in a locked state in the direction of rotation D is limited by a first locking range. A movement of the spindle unit in a locked state opposite to the direction of rotation D is limited by a second locking range. The first locking range of the first locking element is angled relative to the second locking range. The first locking range is arranged substantially between the return element 81 and the second locking range. An axis A of the spindle unit 13 is arranged in a locked state between the first locking range of the first locking element 47 and the first locking range of the second locking element 75.

[0096] The first locking region 47 of the first locking element 45 is spaced apart from the first locking region 75 of the second locking element 71 along a movement axis BA of the locking unit 27. The first locking region 47 of the first locking element 45 is arranged parallel to the first locking region 75 of the second locking element 71.

[0097] The spindle unit has a flat region with a plurality of surfaces, wherein the locking elements, in a locked state, in particular viewed along the movement axis BA, are arranged substantially between a first surface and a further surface facing away from the first surface, in particular a maximum extent of these surfaces. The first surface and the further surface can be arranged on mutually opposite sides of the spindle unit. In particular, the first surface is arranged parallel to the further surface and / or arranged at a distance from it. This allows a particularly compact design of the locking unit to be achieved.

[0098] Fig. 12 shows a section through the spindle unit. The section shows the toothed poles of the drive stator and the permanent magnets 101 of the spindle unit. The rest position RP is arranged parallel to the movement axis BA.

[0099] Fig. 12a shows a section through the drive unit. The arrangement of the drive stator relative to the spindle unit corresponds to the arrangement shown in Fig. 12.

[0100] In Fig. 12b and 12c, the rest position RP is pivoted by +30 degrees and -30 degrees relative to the movement axis BA.

Claims

Claims 1 . Hand-held power tool with a drive unit (13) having a spindle unit (15) and with a locking unit (27) for locking a spindle unit (15), in particular one mounted so as to be rotatable about a drive axis (A), 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. Hand tool according to claim 1, characterized in that the drive unit (13), in particular the spindle unit (15), is arranged in a rest state in a position aligned with the locking unit (27).

3. Hand tool according to one of the preceding claims, characterized in that the drive unit (13), in particular the spindle unit (15), is arranged in a position aligned with the locking unit (27) in a plurality of rest states, wherein more than 30%, in particular more than 40%, preferably more than 45%, preferably more than 50%, of the rest states of the drive unit (13), in particular the spindle unit (15), are arranged in a position aligned with the locking unit (27). Hand-held power tool according to one of the preceding claims, characterized in that the drive unit (13), in particular the spindle unit (15), is arranged in a position to be aligned with respect to the locking unit (27) in a plurality of rest states, wherein more than 30%, in particular more than 40%, preferably more than 45%, preferably more than 50%, of the rest states of the drive unit (13), in particular the spindle unit (15), are arranged in a position to be aligned with respect to the locking unit (27). Hand-held power tool according to one of the preceding claims, characterized in that the spindle unit (15) has a permanent magnet (101).Hand-held power tool according to one of the preceding claims, characterized in that the spindle unit (15) has a flat region (31) for limiting a movement of the spindle unit (15) in a locked state of the locking unit (27), wherein the flat region (31) has a flat surface (35) which is limited by an inner limiting circle (91) and an outer limiting circle (93) around a drive axis (A), wherein the locking element (45), in particular the first locking region (47), is arranged at a level between the inner limiting circle (91) and the outer limiting circle (93) when viewed along a movement axis (BA) in an unlocked state.Hand tool according to one of the preceding claims, characterized in that the outer boundary circle (93) has an outer diameter relative to a maximum movement of the locking element (45) along the movement axis (BA) of greater than 1, in particular greater than 1.2, preferably greater than 1.4, preferably 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, preferably less than 1.

6. Hand tool according to one of the preceding claims, characterized in that the flat region (31) has a planar surface (35). which overlaps the drive axis (A) by less than 60%, in particular less than 50%, preferably less than 40%, particularly preferably less than 30%, in the circumferential direction (U) by the locking unit (27). Hand-held power tool according to one of the preceding claims, characterized in that the spindle unit (15) is rotatably mounted in a locked state in an angular range of in particular more than 5°, preferably more than 10°, preferably more than 15°, particularly preferably more than 20°, and / or in particular less than 50°, preferably less than 45°, preferably less than 40°, particularly preferably less than 35°. 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) with a first locking region (47) and with a second locking region (49) angled relative to the first locking region (47).Hand-held power tool according to one of the preceding claims, characterized in that the locking unit (27) has a further locking element (71) with a first locking region (73) and a second locking region (75) angled relative to the first locking region (73), wherein the locking element (45) and the further locking element (71) are arranged on opposite sides. 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), in a drive state of the spindle unit (15), is arranged relative to the spindle unit (15), in particular a direction of rotation of the spindle unit (15), in such a way that a transfer of the locking unit (27) from an unlocked state to a locked state is prevented and / or damage is reduced.Hand tool according to claim 1, characterized in that the locking unit (27) has a return element (81) for returning the. Locking unit (27), in particular in a drive state of the spindle unit (15), wherein the return element (81) is arranged on the locking unit in such a way that a transfer of the locking unit from an unlocked state to a locked state during an operating state of the spindle unit is prevented, wherein the return element (81) extends transversely, in particular perpendicularly, to a movement axis (BA) of the spindle unit (27). Hand-held power tool according to one of the preceding claims, characterized in that the locking unit (27) has a first locking element (45) and a second locking element (71), in particular arranged opposite the first locking element (45), wherein the first locking element (45) and the second locking element (71) are spaced at different distances from the spindle unit (15).Hand-held power tool according to one of the preceding claims, characterized in that a movement of the spindle unit (15) in a locked state in the direction of movement, in particular in the direction of rotation, is limited by a first locking region (47), and / or that a movement of the spindle unit (15) in a locked state counter to the direction of movement, in particular counter to the direction of rotation, is limited by a second locking region (49) and / or that the spindle unit (35), in particular an axis (A) of the spindle unit (35), in a locked state is arranged between the first locking element (45), in particular a first locking region (47) of the first locking element (45), and the second locking element (71), in particular a first locking region (75) of the second locking element (71).

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