Hand tool machine attachment

Abstract

A hand-held power tool device, in particular a hand-held screwdriver device, with at least one torque transmitter (12a-b) and at least one tool spindle (14a-b) which is mounted axially movably relative to the torque transmitter (12a-b) and which is rotationally fixed to the torque transmitter (12ab) in at least one displacement state and which is provided for actuating at least one switching element (16a-b) in the displacement state, which activates at least one drive unit (46a-b) driving the torque transmitter (12a-b), characterized by at least one motion simplification unit (20a-b) which is provided for simplifying at least one movement of the tool spindle (14a-b) relative to the torque transmitter (12ab), wherein the motion simplification unit (20a) has at least one friction element (28a) which is provided forat least in the displacement state to reduce friction between the tool spindle (14a) and the torque transmitter (12a).

Description

State of the art

[0001] DE 10 2012 218 272 A1 has already proposed a handheld power tool device, in particular a handheld screwdriver device, with at least one torque transmitter and at least one tool spindle which is mounted axially movable relative to the torque transmitter and which is connected to the torque transmitter in a rotationally fixed manner in at least one displacement state and which is intended to actuate at least one switching element in the displacement state which activates at least one drive unit driving the torque transmitter.

[0002] From US 7 740 369 B2 a hand-held power tool is known, comprising a tool holder which is movably received in a housing and which can be driven via a drive unit which can be switched on or off during an axial adjustment movement of the tool holder.

[0003] WO 2012 / 159 803 A1 describes a machine tool braking device with at least one mechanical braking unit, which has at least one braking element mounted rotatably about a rotation axis, and with at least one actuating unit for activating and / or deactivating the braking unit, which has at least one movably mounted actuating element. Disclosure of the invention

[0004] The invention is based on a hand-held power tool device, in particular a hand-held screwdriver device, with at least one torque transmitter and at least one tool spindle which is mounted so as to be axially movable relative to the torque transmitter and which is connected in a rotationally fixed manner to the torque transmitter in at least one displacement state and which is provided to actuate at least one switching element in the displacement state, which activates at least one drive unit driving the torque transmitter.

[0005] It is proposed that the handheld power tool device have at least one movement simplification unit, which is intended to simplify at least one movement of the tool spindle relative to the torque transmitter. A "handheld power tool device" should be understood in particular as a device which, at least in the assembled state, is at least partially integrated into a handheld power tool. A "handheld power tool" should be understood in particular as a workpiece-processing machine, advantageously a drill, a hammer drill and / or percussion hammer, a saw, a planer, a screwdriver, a milling machine, a grinder, an angle grinder, a gardening tool and / or a multi-function tool. In particular, the handheld power tool is designed as a portable power tool that can be transported by an operator without the need for a transport device.Particularly preferably, the hand-held power tool has a mass that is less than 40 kg, preferably less than 10 kg, and particularly preferably less than 5 kg. A “torque transmitter” is to be understood in particular as a unit that is intended to transmit at least one torque between at least two units. In particular, the torque transmitter is intended to be driven directly or indirectly by the drive motor and to be set in at least one rotary movement by the drive motor and to transmit the rotary movement to at least one further unit, in particular the tool spindle and / or the movement simplification unit. In particular, the torque transmitter is designed as a mechanical shaft.A “drive unit” should be understood in particular to mean an electrical and / or mechanical and / or pneumatic unit which, during operation, is advantageously provided for generating a rotary movement. Various drive units which appear appropriate to a person skilled in the art are conceivable. In particular, the drive unit has at least one drive motor and at least one gear unit. For example, it is conceivable that the drive motor is in continuous operation and that the switching element, in particular a mechanical one, is provided to connect the gear unit to the drive motor and thereby activate the drive unit. In particular, the switching element, in particular an electrical one, is provided to activate the drive motor and thereby activate the drive unit. The drive motor is advantageously designed in particular as an electric motor.A “tool spindle” should be understood in particular to mean a mechanical shaft that is intended to be driven directly or indirectly by the drive motor. In particular, the tool spindle is intended to accommodate at least one insert tool, in particular in a detachable manner. In particular, the tool spindle is intended to fasten the insert tool in a rotationally fixed manner. For example, the tool spindle has at least one contour, in particular a hexagonal contour, for the rotationally fixed fastening of the insert tool. Alternatively, it is conceivable for the tool spindle to have a magnetic bit holder for the rotationally fixed fastening of the insert tool. The phrase that the tool spindle is “rotatably” connected to the torque transmitter in at least one displacement state should be understood in particular to mean that a rotational movement of the tool spindle and a rotational movement of the torque transmitter are coupled to one another.In particular, “rotatably connected” should be understood to mean a connection which, averaged over a complete revolution, transmits a power flow with an unchanged torque, an unchanged direction of rotation and / or an unchanged speed. A “displacement state” should be understood in particular to mean a state in which the tool spindle is arranged relative to the torque transmitter at least with respect to an axial axis, in particular with respect to a rotational axis. In particular, in the at least one displacement state, at least one advantageous external force acts on the tool spindle, in particular one which triggers the displacement state. In particular, in the displacement state, the tool spindle is maximally displaced relative to the torque transmitter with respect to a force-free state of the tool spindle. A “switching element” should be understood in particular to mean an element which has at least two switching states.In particular, the switching element is provided to switch the drive motor between at least two operating states. In particular, the drive motor is activated in a first of the switching states, and deactivated in a second of the switching states. For example, the switching element could be designed as a mechanical, pneumatic, and / or hydraulic switching element. In particular, the switching element is designed as an electrical switching element. In particular, actuation of the switching element initiates at least one operating state in which at least one torque is transmitted between the tool spindle and the torque transmitter by means of the rotationally fixed connection.A "motion simplification unit" is understood, in particular, to mean a unit designed to effect at least a simple axial displacement of the tool spindle relative to the torque transmitter, at least in the displacement state. In particular, the motion simplification unit is designed to prevent at least a blockage of the axial displacement of the tool spindle relative to the torque transmitter, at least in the displacement state.

[0006] The inventive design of the handheld power tool device advantageously allows for precise and reliable torque transmission between the tool spindle and the torque transmitter, as well as facilitating axial displacement of the tool spindle relative to the torque transmitter. Furthermore, easy deactivation of the drive motor is advantageously achieved.

[0007] It is further proposed that the tool spindle at least partially surrounds the torque transmitter, in particular on at least one cross-sectional plane which is oriented at least substantially perpendicular to a rotational axis of the tool spindle and / or the torque transmitter. In particular, the tool spindle at least partially surrounds the torque transmitter at least in the displacement state. In particular, the tool spindle at least partially surrounds the torque transmitter at least in a force-free state of the tool spindle. Alternatively, it is conceivable for the torque transmitter to at least partially surround the tool spindle. It is also conceivable for the tool spindle and the torque transmitter to be mounted so as to at least partially engage with one another, wherein the tool spindle and the torque transmitter are arranged at least substantially the same distance from the rotational axis in the interlocking region.The phrase "at least partially" encompasses the torque transmitter should be understood in particular to mean that the tool spindle has at least one partial region that encompasses at least one partial region of the torque transmitter. The phrase "at least partially" encompasses the torque transmitter should be understood in particular to mean that the tool spindle surrounds the torque transmitter with respect to the axis of rotation, at least on the cross-sectional plane, over an angular range of more than 180°, in particular more than 270°, and advantageously more than 330°. This makes it possible to achieve advantageous mounting of the tool spindle relative to the torque transmitter, whereby torque can be transmitted between the tool spindle and the torque transmitter in an advantageously safe and precise manner.

[0008] It is also proposed that the motion-simplifying unit be designed to prevent direct contact between the tool spindle and the torque transmitter, at least in the radial direction. In particular, the motion-simplifying unit is designed to maintain a distance of more than 1 mm, in particular more than 2 mm, and advantageously more than 3 mm, between the tool spindle and the torque transmitter, at least in the radial direction. This advantageously reduces friction between the tool spindle and the torque transmitter and facilitates axial displacement.

[0009] It is further proposed that the motion-simplifying unit be designed to prevent direct contact between the tool spindle and the torque transmitter, at least in the direction of rotation. In particular, the motion-simplifying unit is designed to maintain a distance of more than 1 mm, in particular more than 2 mm, and advantageously more than 3 mm, between the tool spindle and the torque transmitter, at least in the direction of rotation. This advantageously prevents tilting of the tool spindle and the torque transmitter, and achieves precise torque transmission.

[0010] It is further proposed that the handheld power tool device comprise at least one spring element designed to release at least the displacement state upon release of a force triggering the displacement state. For example, the spring element could be designed as a torsion spring, a leaf spring, and / or a coil spring. Alternatively, other configurations of the spring element that would be deemed appropriate by a person skilled in the art are conceivable. This advantageously allows the tool spindle to return to a forceless state after release of the force triggering the displacement state, thus releasing the displacement state.

[0011] It is also proposed that the movement simplification unit comprise at least one friction element designed to reduce at least one friction between the tool spindle and the torque transmitter, in particular at least in the radial direction and / or in the circumferential direction, at least in the displacement state. A “friction element” is to be understood in particular as an element designed to convert at least one type of friction, in particular static friction and / or sliding friction, into at least one further type of friction, in particular rolling friction. In particular, the friction element is designed as a ball. Alternatively, the friction element could be designed as a roller. Likewise conceivable are further configurations of the friction element that would appear appropriate to a person skilled in the art. This advantageously facilitates movement of the tool spindle relative to the torque transmitter in a simple manner.

[0012] It is further proposed that the tool spindle and the torque transmitter form at least one raceway in which the friction element is movably mounted. A "raceway" should be understood in particular as a spatial object formed by the tool spindle and the torque transmitter, in which the friction element is movably mounted. In particular, the tool spindle and the torque transmitter form at least outer boundary surfaces of the raceway. In particular, the raceway is designed as an intermediate space between the tool spindle and the torque transmitter. As a result, the friction element can advantageously be movably mounted on a raceway defined by the tool spindle and the torque transmitter, whereby movement of the friction element can be facilitated.

[0013] It is further proposed that the motion-simplifying unit have at least one friction-reducing coating. In particular, the motion-simplifying unit has at least two coatings, each arranged on one of two components rubbing against one another, in particular on the tool spindle and the torque transmitter. In particular, the coating is intended to reduce at least one friction between the tool spindle and the torque transmitter. In particular, the coating comprises at least one material with a low coefficient of static and / or sliding friction, wherein the material is formed, for example, from polytetrafluoroethylene PTFE and / or molybdenum disulfide MoS2. Alternatively, other materials that appear appropriate to a person skilled in the art are conceivable. A “coating” is to be understood as a particularly firmly adhering layer of a substance that is applied to a surface of at least one component.In particular, the coating has a material thickness that is less than 10%, preferably less than 5%, and in particular less than 1% of a material thickness of the component to which the coating is applied. In particular, the coating has an at least substantially constant material thickness. In particular, the coating has a material thickness of less than 100 µm, in particular less than 50 µm, and advantageously less than 10 µm. An “at least substantially constant material thickness” should be understood in particular to mean a material thickness whose amount changes on the surface of the component by less than 20%, in particular by less than 10%, and advantageously by less than 5%. This can advantageously reduce friction and simplify movement.

[0014] The handheld power tool device according to the invention is not intended to be limited to the application and embodiment described above. In particular, the handheld power tool device according to the invention may have a number of individual elements, components, and units that differs from the number stated herein to fulfill a function described herein. drawing

[0015] 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 expediently consider the features individually and combine them into useful further combinations.

[0016] They show: Fig. 1 a hand-held power tool according to the invention with a hand-held power tool device according to the invention in a schematic representation, Fig. 2 a section of the hand tool according to the invention from Fig. 1 in a powerless state, Fig. 3 a section of the hand tool according to the invention from Fig. 1 in a displacement state, Fig. 4 a tool spindle according to the invention in a perspective view, Fig. 5 a torque transmitter according to the invention in a perspective view, Fig. 6 a section through the line VI-VI Fig. 3, Fig. 7 shows a further embodiment of a tool spindle and a torque transmitter, Fig. 8 shows a further embodiment of a tool spindle and a torque transmitter and Fig. 9 another embodiment of a tool spindle and a torque transmitter. Description of the embodiments

[0017] Fig. 1 shows a handheld power tool 34a according to the invention, which is designed as a handheld screwdriver, with a handheld power tool device 10a according to the invention, which is designed as a handheld screwdriver device. The handheld power tool device 10a has an energy storage device 38a arranged in a housing 36a of the handheld power tool 34a, which is designed as an accumulator. Furthermore, the handheld power tool device 10a has control electronics 40a and a switching element 16a, each of which is supplied with energy by the energy storage device 38a. The energy storage device 38a, the control electronics 40a, and the switching element 16a are part of an activation unit 44a of the handheld power tool device 10a. The activation unit 44a is arranged in a rear region of the housing 36a with respect to an axial direction 42a.

[0018] The handheld power tool device 10a has a drive unit 46a, which includes a drive motor 18a and a gear unit 48a. The drive motor 18a and the gear unit 48a are arranged one behind the other in the housing 36a along the axial direction 42a. The drive motor 18a and the gear unit 48a are directly connected to one another for transmitting a rotational speed and a torque. The drive motor 18a has a motor shaft 50a, which projects directly into the gear unit 48a and which forms a rotational axis 52a. The activation unit 44a is provided for controlling the drive unit 46a, in particular the drive motor 18a, and is electrically connected to the drive motor 18a (not further visible).

[0019] In an area facing away from the activation unit 44a with respect to the axial direction 42a, the handheld power tool device 10a has a torque transmitter 12a and a tool spindle 14a. The torque transmitter 12a is intended to be driven by the drive motor 18a of the drive unit 46a and to transmit a torque to the tool spindle 14a. The tool spindle 14a partially surrounds the torque transmitter 12a. When driven by the drive motor 18a, the tool spindle 14a and the torque transmitter 12a rotate about the rotational axis 52a. In addition, the handheld power tool device 10a has a further switching element 54a for transmitting a switching signal along the rotational axis 52a to the switching element 16a. The further switching element 54a is guided past the drive motor 18a over the entire drive unit 46a. The further switching element 54a is designed as a mechanical switching element 54a.The additional switching element 54a is formed by a slide switch. The additional switching element 54a is positively connected to the tool spindle 14a.

[0020] The tool spindle 14a is mounted axially movable relative to the torque transmitter 12a and is connected to the torque transmitter 12a in a rotationally fixed manner. A displacement state can be created by an axial displacement of the tool spindle 14a, which is aligned substantially parallel to the axial direction 42a. For example, the axial displacement of the tool spindle 14a is caused by an external force applied by an operator. The external force is caused by an operator pressing the hand-held power tool 34a against a workpiece to be machined in the axial direction 42a, with the tool spindle 14a being arranged in direct contact with the component to be machined. As a result, the tool spindle 14a is displaced relative to the axial direction 42a by a distance of less than 10 mm. Advantageously, the tool spindle 14a is displaced relative to the axial direction 42a by a distance in a range of 1 mm to 4 mm.By means of the further switching element 54a, which is positively connected to the tool spindle 14a, the tool spindle 14a actuates the switching element 16a in the displacement state, which activates the drive unit 46a driving the torque transmitter 12a. In the displacement state, the distance between the tool spindle 14a and the torque transmitter 12a is minimal, and the tool spindle 14a is non-rotatably connected to the torque transmitter 12a in the displacement state (see . Fig. 3).

[0021] To deactivate the drive motor 18a of the drive unit 46a, an axial displacement of the tool spindle 14a from the displacement state substantially parallel to the axial direction 42a is necessary until the tool spindle 14a is arranged in a force-free state (cf. Fig. 2). For this purpose, the handheld power tool device 10a comprises a spring element 26a, which is designed to release the displacement state upon release of a force triggering the displacement state. The spring element 26a is arranged between the tool spindle 14a and the torque transmitter 12a.

[0022] The handheld power tool device 10a has a motion simplification unit 20a, which is provided to simplify a movement of the tool spindle 14a relative to the torque transmitter 12a. The tool spindle 14a and the torque transmitter 12a form four intermediate spaces 56a, in which the motion simplification unit 20a is essentially arranged. The motion simplification unit 20a has four subregions (see FIG. Fig. 4 to Fig. 6). The four sub-regions of the motion simplification unit 20a are arranged essentially in a circle when viewed in a cross-sectional plane that is oriented essentially perpendicular to the rotation axis 52a (cf. Fig. 6). The motion simplification unit 20a has eight friction elements 28a, each of which is intended to reduce friction between the tool spindle 14a and the torque transmitter 12a in the displacement state. Two of the friction elements 28a, each designed as a ball, are arranged in one of the intermediate spaces 56a. It is conceivable that a respective one of the friction elements 28a arranged in one of the intermediate spaces 56a is firmly bound to a respective component forming the intermediate space 56a, in particular the tool spindle 14a and the torque transmitter 12a, for example by means of at least one bulge. The friction elements 28a are each intended to convert static friction and / or sliding friction between the tool spindle 14a and the torque transmitter 12a into rolling friction.

[0023] As an alternative to designing the movement simplification unit 20a with four sub-areas, it is conceivable that the movement simplification unit 20a has two sub-areas (cf. Fig. 8). Here, the tool spindle 14a and the torque transmitter 12a form two intermediate spaces 56a, in which the motion-simplifying unit 20a is essentially arranged. The motion-simplifying unit 20a has four friction elements 28a, with two of the friction elements 28a being arranged in each of the intermediate spaces 56a. Alternatively, further numbers of intermediate spaces 56a and friction elements 28a that would be deemed appropriate by a person skilled in the art are conceivable, in particular configurations with more than four intermediate spaces 56a.

[0024] In the following, only one of the gaps 56a and one of the friction elements 28a is described. The tool spindle 14a and the torque transmitter 12a form a track 30a in which the friction element 28a is movably mounted (see Fig. 4 to Fig. 6). The raceway 30a is formed by the intermediate space 56a. The tool spindle 14a and the torque transmitter 12a form lateral boundary surfaces of the raceway 30a, designed as raceway surfaces. The tool spindle 14a and the torque transmitter 12a each form a boundary surface of the raceway 30a with respect to the axial direction 42a. The tool spindle 14a and the torque transmitter 12a each form a boundary surface of the raceway 30a with respect to a radial direction 22a. The tool spindle 14a and the torque transmitter 12a each form a boundary surface of the raceway 30a with respect to a circumferential direction 24a.

[0025] The tool spindle 14a has two limiting elements 58a, each of which is provided to limit a movement of the movement simplification unit 20a with respect to the axial direction 42a, both in the displacement state and in the force-free state of the tool spindle 14a (cf. Fig. 2 and Fig. 3). The limiting elements 58a are provided to hold the friction element 28a on the track 30a and to prevent the friction element 28a from leaving the track 30a. Furthermore, the limiting elements 58a are provided to limit the axial displacement of the tool spindle 14a relative to the torque transmitter 12a. The track 30a has a predetermined, defined extent, which is aligned substantially parallel to the axial direction 42a and is limited by the encompassing bearing of the tool spindle 14a and the torque transmitter 12a. By means of a combination of the predetermined, defined extent of the track 30a and the limiting elements 58a, the friction element 28a can be held on the track 30a.

[0026] In the present exemplary embodiment, the tool spindle 14a and the torque transmitter 12a have concave curvatures in the region of the raceway 30a, which are provided for receiving the friction element 28a. As a result, the boundary surfaces of the raceway 30a are convexly shaped. Furthermore, the convexly shaped boundary surfaces of the raceway 30a are provided for guiding the friction element 28a with respect to the axial direction 42a. This can achieve a low probability of slippage occurring between the friction element 28a and the boundary surfaces of the raceway 30a. In addition, it can be achieved that the friction element 28a rolls on the raceway 30a instead of slipping. Furthermore, a low surface pressure between the boundary surfaces of the raceway 30a and the friction element 28a can be achieved.As an alternative to the convexly shaped boundary surfaces of the raceway 30a, it is conceivable that the boundary surfaces of the raceway 30a are flat and / or straight with respect to the axial direction 42a (cf. . Fig. 7 and Fig. 8).

[0027] By mounting the friction element 28a in the raceway 30a, direct contact between the tool spindle 14a and the torque transmitter 12a in the radial direction 22a and in the circumferential direction 24a is prevented (cf. Fig. 4 to Fig. 6). The motion simplification unit 20a is provided to prevent direct contact between the tool spindle 14a and the torque transmitter 12a in the radial direction 22a. Furthermore, the motion simplification unit 20a is provided to prevent direct contact between the tool spindle 14a and the torque transmitter 12a in the circumferential direction 24a. The friction element 28a is provided to effect contact between the tool spindle 14a and the torque transmitter 12a and to transmit torque between the torque transmitter 12a and the tool spindle 14a. Furthermore, the friction element 28a is provided to prevent direct contact between the tool spindle 14a and the torque transmitter 12a in the radial direction 22a and in the circumferential direction 24a.As an alternative to the friction element 28a configured as a ball, it is conceivable for the friction element 28a to be configured as a cylindrical roller, needle roller, tapered roller, barrel roller, and / or spherical roller. In each of the alternatives, a cage could be provided, each of which would be intended to maintain an orientation of the friction element 28a relative to the raceway 30a. Rolling surfaces of friction elements 28a configured as rollers would be aligned in the direction of rotation 24a. Such an alternative configuration of the friction element 28a could achieve advantageous surface pressure between the boundary surfaces of the raceway 30a and the friction element 28a.

[0028] In the present exemplary embodiment, the friction element 28a in the form of a ball has a diameter of essentially 1 mm. It is conceivable that a friction element 28a in the form of a ball with a different diameter is used during assembly. By increasing the diameter of the friction element 28a in the form of a ball, a low surface pressure between the boundary surfaces of the raceway 30a and the friction element 28a can be advantageously achieved, as well as simple assembly. By reducing the diameter of the friction element 28a in the form of a ball, a small space requirement and a large number of friction elements 28a per raceway 30a can be advantageously achieved. By increasing the number of friction elements 28a per raceway 30a, a low surface pressure between the boundary surfaces of the raceway 30a and the friction element 28a can be advantageously achieved, as well as a small space requirement.

[0029] In the displacement state, a force is transmitted between the torque transmitter 12a, the friction element 28a, and the tool spindle 14a under the influence of a torque. To achieve advantageous force transmission, a force between the friction element 28a and the boundary surfaces of the raceway 30a is oriented substantially perpendicular to the boundary surfaces of the raceway 30a. This can reduce the probability of slippage occurring between the friction element 28a and the boundary surfaces of the raceway 30a. Furthermore, it can be achieved that the friction element 28a rolls on the raceway 30a instead of slipping. The force is transmitted between the friction element 28a and the boundary surfaces of the raceway 30a in the form of a point transmission.To minimize wear and achieve the longest possible service life, the tool spindle 14a and the torque transmitter 12a have a hard and essentially smooth surface. The tool spindle 14a and the torque transmitter 12a are manufactured using a sintering process. In addition, the tool spindle 14a and the torque transmitter 12a are subjected to a hardening process. Furthermore, after the sintering process, the tool spindle 14a and the torque transmitter 12a are glass-bead peened in a further process step. It is also conceivable for the motion simplification unit 20a to have a friction-reducing coating. In this case, the friction element 28a could have the friction-reducing coating. Alternatively or additionally, the tool spindle 14a and / or the torque transmitter 12a could have the friction-reducing coating.

[0030] In Fig. 9 shows a further embodiment of the invention. The following descriptions and the drawings are essentially limited to the differences between the embodiments, whereby with regard to components with the same designation, in particular with regard to components with the same reference numerals, reference is also made to the drawings and / or the description of the other embodiments, in particular to the Fig. 1 to 8. To distinguish the embodiments, the letter a is added to the reference numerals of the embodiment in Fig. 1 to 8. In the example of the Fig. 9, the letter a is replaced by the letter b.

[0031] Fig.9 shows a further embodiment of a tool spindle 14b and a torque transmitter 12b, each part of a handheld power tool device 10b, in a perspective view. The handheld power tool device 10b, which is designed as a handheld screwdriver device, comprises the torque transmitter 12b and the tool spindle 14b, which is mounted axially movable relative to the torque transmitter 12b and which, in a displacement state, is connected in a rotationally fixed manner to the torque transmitter 12b and which, in the displacement state, is provided to actuate a switching element that activates a drive unit driving the torque transmitter 12b. The tool spindle 14b partially encompasses the torque transmitter 12b. The tool spindle 14b and the torque transmitter 12b form a plurality of intermediate spaces 56b in a contact area, which form a spline.The handheld power tool device 10b comprises a motion-simplifying unit 20b, which is intended to simplify a movement of the tool spindle 14b relative to the torque transmitter 12b. The motion-simplifying unit 20b is arranged in the gaps 56b. The motion-simplifying unit 20b has two friction-reducing coatings 32b, with a first of the coatings 32b being arranged on the tool spindle 14b and a second of the coatings 32b being arranged on the torque transmitter 12b. The coatings 32b are arranged on surfaces of the tool spindle 14b and the torque transmitter 12b that rub against each other.

Claims

[1] Hand tool device, in particular hand tool screwdriver device, with at least one torque transmitter (12a-b) and at least one tool spindle (14a-b) which is mounted axially movable relative to the torque transmitter (12a-b) and which is connected in at least one displacement state to the torque transmitter (12ab) in a rotationally fixed manner and which is provided, in the displacement state, to actuate at least one switching element (16a-b) which activates at least one drive unit (46a-b) driving the torque transmitter (12a-b), characterized byat least one movement simplification unit (20a-b) which is provided to simplify at least one movement of the tool spindle (14a-b) relative to the torque transmitter (12ab), wherein the movement simplification unit (20a) has at least one friction element (28a) which is provided to reduce at least one friction between the tool spindle (14a) and the torque transmitter (12a), at least in the displacement state. [2] Hand tool device according to one of the preceding claims, characterized by that the tool spindle (14a-b) at least partially encompasses the torque transmitter (12a-b). [3] Hand tool device according to one of the preceding claims, characterized by that the movement simplification unit (20a) is provided to avoid direct contact between the tool spindle (14a) and the torque transmitter (12a) at least in the radial direction (22a). [4] Hand tool device according to one of the preceding claims, characterized by that the movement simplification unit (20a) is provided to avoid direct contact between the tool spindle (14a) and the torque transmitter (12a) at least in the direction of rotation (24a). [5] Hand tool device according to one of the preceding claims, characterized by at least one spring element (26a) which is intended to release at least the displacement state as a result of a release of a force triggering the displacement state. [6] Hand tool device according to one of claims 1 to 5, characterized by that the friction element (28a) is designed as a ball. [7] Hand tool device according to one of the preceding claims, characterized by that the tool spindle (14a) and the torque transmitter (12a) form at least one track (30a) in which the friction element (28a) is movably mounted. [8] Hand tool device according to one of claims 1 to 5, characterized by that the movement simplification unit (20b) has at least one friction-reducing coating (32b). [9] Hand-held power tool with a hand-held power tool device (10a-b) according to one of claims 1 to 8.

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