Hand-held power tool

Abstract

The invention relates to a hand-held power tool (100) having: a housing (110); a drive motor (114); an intermediate shaft (120), wherein the intermediate shaft (120) can be driven by the drive motor (114); a striking mechanism (122) which has a striking tool (300) and a radial spring system (350) that is rotationally fixed to the striking tool (300), wherein the striking mechanism (122) can be at least partially driven by the intermediate shaft (120); and a tool holder (150) for receiving a work tool (140), wherein the tool holder (150) can be driven by means of the striking mechanism (122), in particular the striking tool (300), and / or the intermediate shaft (120), wherein the intermediate shaft (120) has at least one bearing (200) against which the radial spring system (350) sits. It is proposed that the hand-held power tool (100) has a rotation-coupling element (500) which is designed to couple at least the striking tool (300) to the bearing (200).

Description

[0001] Description

[0002] title

[0003] hand tool

[0004] The present invention relates to a hand-held power tool according to the preamble of claim 1.

[0005] State of the art

[0006] From CN 212330861 U an impact wrench with a drive motor for driving a drive shaft and an output shaft that can be coupled to a tool holder, as well as an impact mechanism, is known.

[0007] Disclosure of the invention

[0008] The present invention is based on a hand-held power tool with a housing, with a drive motor, with an intermediate shaft, wherein the intermediate shaft can be driven by the drive motor, with an impact mechanism which has a striker and a radial spring system connected to the striker in a rotationally fixed manner, wherein the impact mechanism can be driven at least partially by the intermediate shaft, and with a tool holder for receiving an insert tool, wherein the tool holder can be driven by means of the impact mechanism, in particular the striker, and / or the intermediate shaft, wherein the intermediate shaft has at least one bearing against which the radial spring system rests. It is proposed that the hand-held power tool have a torsional drive which is designed to couple at least the striker to the bearing.

[0009] The invention provides a handheld power tool with a high-inertia percussion mechanism in which the radial spring system is non-rotatably connected to the striker, thus providing additional striker mass. CN 212330861 U lacks the torsional drive to synchronize the radial spring system with the striker.

[0010] The handheld power tool can be designed as an electrically powered handheld power tool. The electrically powered handheld power tool can be designed as a mains-powered or battery-powered handheld power tool. For example, the handheld power tool can be designed as an impact wrench.

[0011] The housing of the handheld power tool is designed to at least partially accommodate the tool holder, the drive motor, the intermediate shaft, and the impact mechanism. The housing can be designed as a shell housing with two half-shells.

[0012] The drive motor can be designed as an electrically commutated drive motor, in particular as at least one electric motor. The drive motor is configured such that it can be actuated via the handset. If the handset is actuated by a user, the drive motor is switched on and the handheld power tool is put into operation. If the handset is no longer actuated by the user, the drive motor is switched off. Preferably, the drive motor can be electronically controlled and / or regulated such that reversing operation and a specification for a desired rotational speed can be implemented. In reversing operation, the drive motor can be switchable between a clockwise direction of rotation and a counterclockwise direction of rotation. To switch the drive motor in reversing operation, the handheld power tool can have a direction of rotation switching element, in particular a direction of rotation switch.

[0013] The drive motor is designed to drive the intermediate shaft. For this purpose, the drive motor and the intermediate shaft are connected to one another. The intermediate shaft is arranged between the drive motor and the tool holder. The intermediate shaft can have a gear unit. The gear unit can be designed as at least one planetary gear, wherein it can, for example, be switchable. The planetary gear can have at least one planetary stage. With a switchable transmission, switching between at least two gear stages can take place by means of at least one gear switching element, in particular a gear switch. The gear unit can have a gear cover. The gear cover is designed to cover the gear unit from the drive motor, in particular to at least partially close it. The gear cover can be arranged between the planetary gear, in particular the planetary stage, and the drive motor.The gear unit, in particular the planetary gear, can have a ring gear. Here, for example, the ring gear and the gear cover can be integral.

[0014] The impact mechanism is designed to be operated in impact mode. During impact mode, the impact mechanism generates high torque peaks in order to loosen or tighten stuck fasteners. The impact mechanism comprises the impactor and the radial spring system connected to the impactor in a rotationally fixed manner. The impact mechanism can be connected to the drive motor via the gear unit of the intermediate shaft. The impact mechanism can be designed, for example, as a rotary impact mechanism or a V-groove impact mechanism. The impact mechanism is driven by the intermediate shaft. The impact mechanism can be arranged between the drive motor and the tool holder. The impact mechanism has an impact mechanism housing in which the impactor and the radial spring system are arranged. The impact mechanism also has an impact mechanism cover. The impact mechanism cover can seal off the impact mechanism towards the drive motor.The impact mechanism cover can be arranged between the drive motor and the tool holder, in particular the intermediate shaft, and especially the gear unit. It is possible for the impact mechanism cover and the gear cover to be integral, so that the impact mechanism cover forms the ring gear.

[0015] The striker and the radial spring system can be arranged circumferentially around the intermediate shaft. The striker can be mounted on the intermediate shaft by means of impact mechanism balls. In addition, the impact mechanism balls are designed to move the striker at least partially, in particular axially, in the direction of the drive motor. The striker can be arranged in a position facing the tool holder or in a position facing the drive motor. In the position facing the tool holder, the striker can rest against a rear end of the tool holder by means of at least one impact cam. Here, for example, two impact cams are provided, although more than two impact cams are also conceivable. In the position facing the drive motor, the striker can be arranged at a distance from the tool holder.The impact mechanism balls are designed to wind up the impact mechanism from a triggering torque that can be applied to the tool holder. The impact mechanism balls move, in particular shift, the striker from the position facing the tool holder against a spring force of the radial spring system to the position facing the drive motor. The spring force exerted by the radial spring system is stored in the radial spring system as performed clamping work. As soon as the striker reaches the position facing the drive motor, the striker can be guided back to the position facing the tool holder by means of the radial spring system. The performed clamping work of the radial spring system is released, whereby the striker is guided into the position facing the tool holder. The striker can perform a rotational movement and an axial movement.

[0016] The drive motor has a drive shaft. The drive shaft is mounted in the housing by means of at least one drive shaft bearing. The drive motor can drive the intermediate shaft, the gear unit, the impact mechanism and / or the tool holder by means of the drive shaft. The drive shaft bearing can be designed, for example, as a ball bearing, a rolling bearing or a plain bearing. The drive shaft bearing is arranged at an end of the drive motor facing the tool holder. The drive shaft can protrude into the intermediate shaft through the gear unit. The drive shaft bearing can be arranged in the intermediate shaft such that the drive shaft is mounted in the intermediate shaft by means of the drive shaft bearing. The drive shaft can have a further drive shaft bearing arranged at an end facing away from the drive motor.The drive shaft can then be rotatably mounted in the housing by means of the drive shaft bearing and the additional drive shaft bearing. It is possible for the drive shaft to extend into the gear cover and / or engage with the gear cover. The handheld power tool can have a tool axis. A rotational axis of the drive shaft can form the tool axis. In particular, "axial" should be understood as essentially parallel to the tool axis. Whereas "radial" should be understood as essentially perpendicular to the tool axis.

[0017] The radial spring system is a spring system that has spring elements arranged radially offset and / or circumferentially relative to the tool axis. The radial spring system comprises a plurality of spring elements. For example, two, three, four, or more than four, such as eight, spring elements may be possible. The majority of the spring elements can be arranged circumferentially relative to the tool axis. The striker has at least one receptacle for the radial spring system. The number of receptacles for the radial spring system can correspond to the plurality of spring elements. The receptacle for the radial spring system can be pot-shaped, shell-shaped, or shaft-shaped. It is conceivable that the receptacle for the radial spring system can be pin-shaped, stud-shaped, or web-shaped, although other shapes are also conceivable.A combination for the mount for the radial spring system is also possible, such as a pot-shaped mount with a pin, so that at least one of the spring elements can be guided in the circumferential direction of the spring element and essentially within the spring element. A web can be formed between any two adjacent spring elements, increasing the striker's mass to increase the striker's mass inertia. The spring elements can be designed, for example, as spiral springs, barrel springs, conical springs, chimney springs, profile springs, or a combination thereof.

[0018] The radial spring system is connected to the striker in a rotationally fixed manner, so that the radial spring system rotates with the striker. The radial spring system can be connected to the striker in a form-fitting, force-fitting and / or material-fitting manner. The spring elements can be accommodated via the receptacles for the spring elements of the radial spring system and can be inserted, pressed in, pressed on or glued, for example. If the receptacle is cup-shaped, the respective spring element can be inserted. If the receptacle is pin-shaped, the respective spring element can be clipped on. Both options increase the mass inertia of the striker, as the striker mass is higher than with a single coil spring. The tool holder can be designed as an internal tool holder, such as a bit holder, and / or as an external tool holder, such as a socket.It is also conceivable for the tool holder to be designed as a drill chuck. The tool holder can accommodate insert tools, such as screw bits or socket wrenches, allowing a user to create screw connections between a fastener and a fastener carrier.

[0019] In addition, the handheld power tool comprises a power supply, wherein the power supply is provided for battery operation by means of batteries, in particular handheld power tool battery packs, and / or for mains operation. In a preferred embodiment, the power supply is designed for battery operation. In the context of the present invention, a “handheld power tool battery pack” is understood to mean a combination of at least one battery cell and a battery pack housing. The handheld power tool battery pack is advantageously designed to supply energy to commercially available battery-operated handheld power tools. The at least one battery cell can, for example, be a Li-ion battery cell with a nominal voltage of 3.6 V. For example, the handheld power tool battery pack can comprise up to ten battery cells, although a different number of battery cells is also conceivable.An embodiment as a battery-operated hand tool as well as operation as a mains-operated hand tool are sufficiently known to the person skilled in the art, which is why the details of the power supply will not be discussed here.

[0020] The handheld power tool may have a control unit for controlling at least the drive motor. The control unit may be arranged in the housing, for example, in a handle of the handheld power tool or in an area of ​​a power supply interface.

[0021] The bearing of the intermediate shaft enables the radial spring system to be arranged so that it can rotate relative to the intermediate shaft in the striking mechanism housing. The radial spring system is then connected to the striker in a rotationally fixed manner and is simultaneously rotatable relative to the intermediate shaft. The bearing of the intermediate shaft can, for example, be designed as a needle bearing, a barrel bearing, a roller bearing, a plain bearing, or a ball bearing. The radial spring system rests against the bearing. “Resting” here should be understood as being in direct and immediate contact. The bearing of the intermediate shaft is in direct and immediate contact with the bearing, in particular with at least one element of the bearing. The radial spring system rests against the bearing of the intermediate shaft in such a way that when the radial spring system rotates, the bearing of the intermediate shaft also rotates at least partially. This enables the striking mechanism spring to rotate relative to the intermediate shaft by means of the bearing.

[0022] The torsional drive is designed such that when the striker rotates, the radial spring system rotates along with the radial system. The torsional drive can be designed to at least partially engage with the striker, at least during impact operation. The torsional drive is engaged and coupled to the striker, at least during impact operation. The torsional drive can be arranged substantially within the impact mechanism, in particular the impact mechanism housing. A plurality of torsional drives can be provided, such as two or three torsional drives. The torsional drive can extend axially to the tool axis within the impact mechanism. For example, the torsional drive can be designed in the manner of a pin, a web, an edge, a projection, or a bolt. For example, the torsional drive can also be shaped in the manner of a thread, a ring gear, or a crown gear.

[0023] In one embodiment of the handheld power tool, the torsional drive is arranged radially, particularly relative to the tool axis, between the intermediate shaft and the impact mechanism housing. The torsional drive can be arranged axially between the planetary gear and the output shaft. The torsional drive can extend axially along the tool axis. It is possible for the torsional drive to extend at least partially in the circumferential direction around the tool axis.

[0024] In one embodiment of the handheld power tool, the intermediate shaft has at least one planetary carrier, with the bearing arranged between the radial spring system and the planetary carrier. The intermediate shaft is part of the planetary gear system. The planetary gear system has planetary gears and at least one planetary carrier. The at least one planetary carrier supports the planetary gears rotatably relative to the intermediate shaft. The bearing is arranged axially between the at least one planetary carrier and the radial spring system.

[0025] In one embodiment of the handheld power tool, the radial spring system rests against a bearing disk of the bearing. The radial spring system rests directly and immediately against the bearing disk. The bearing disk is arranged towards the tool holder. The bearing disk is designed to enable a different rotational speed than the intermediate shaft for an element resting against the bearing disk. The bearing disk can be designed as a disk or a ring. The bearing has rolling elements, which can be designed, for example, as balls, needles, or rollers. The bearing disk is arranged axially between the rolling elements and the radial spring system. The bearing disk can be essentially disk-shaped or annular. Furthermore, the bearing disk can be essentially flat, although this depends on the rolling elements.If the rolling elements are designed as balls, the bearing disc can have a cup-like receptacle for the balls. If the rolling elements are designed as rollers or needles, the bearing disc can be flat.

[0026] Alternatively, it is conceivable for the radial spring system to partially rest against the bearing disc. In this case, a first number of spring elements rests against the bearing disc, while a second number of spring elements is arranged at a distance from the bearing disc. The second number of spring elements would rest against a definable winding point during the racket's winding. This would then enable two radial spring systems.

[0027] In one embodiment of the handheld power tool, the planetary carrier is at least partially formed as a bearing cover plate. The planetary carrier and the bearing cover plate can be integral. The bearing cover plate is arranged in the direction of the drive motor. The bearing cover plate can be arranged opposite the bearing race. The bearing cover plate is designed at least to support the rolling elements. The bearing cover plate can have a receptacle dependent on the rolling elements, such as a shell-like receptacle for the rolling elements in the case of balls, or a flat receptacle in the case of rollers or needles. The bearing race and the bearing cover plate, together with the rolling elements, form the bearing.

[0028] In one embodiment, the bearing, in particular the bearing disk, has at least one retaining element designed to retain the rolling elements of the bearing. The retaining element is provided to radially retain the rolling elements of the bearing. The design of the retaining element depends on the configuration of the bearing, in particular the bearing disk, the rolling elements, and the bearing cover disk. The retaining element can be arranged, in particular radially, between the tool axis and the rolling elements. The retaining element prevents the rolling elements from falling radially toward the tool axis. The retaining element can be designed as a shoulder, an edge, a projection, a web, a collar, or a shoulder. It is possible for the bearing, in particular the bearing disk, to form the retaining element. This would then result in the bearing disk and the retaining element being integral.

[0029] In one embodiment, the intermediate shaft, in particular the bearing cover plate, has a radial stop for the rolling elements of the bearing on an outer circumference. The radial stop can be arranged radially, in particular to the tool axis, opposite the retaining element of the bearing disk. The radial stop is designed to radially retain the rolling elements of the bearing. The radial stop represents a radial limitation for the rolling elements of the bearing. The radial stop can be formed at least partially in the circumferential direction to the tool axis. In addition, the radial stop can extend at least partially axially. The radial stop can be designed in the manner of an edge, a projection, a web, or the like. The radial stop can be connected to the intermediate shaft, in particular the bearing cover plate, in a form-fitting, force-fitting, and / or material-fitting manner.It is possible for the intermediate shaft, in particular the bearing cover plate, to form the radial stop, so that they are a single piece. The rolling elements can be arranged radially, in particular to the tool axis, between the retaining element and the radial stop. The striker can have a contact element on an inner circumference. The contact element can be accommodated by a neck of the intermediate shaft. The contact element can slide on the neck of the intermediate shaft.

[0030] In one embodiment of the hand-held power tool, the striker has at least one guide element designed to accommodate the torsional drive. The striker can form the guide element so that they are a single piece. It is possible for the guide element of the striker and the striker to be two-piece, so that they are connected to one another in a form-fitting, force-fitting, and / or material-locking manner. The guide element of the striker can be arranged in the circumferential direction relative to the tool axis. Furthermore, the guide element of the striker can extend axially, in particular relative to the tool axis. The guide element of the striker can be designed in the manner of a groove, a recess, or in the manner of a rail, a web, or a gear. The guide element of the striker can at least partially encompass the torsional drive so that the bearing can rotate the radial spring system with the striker at the same rotational speed via the torsional drive.At least during impact operation, the torsional drive can be in contact with the guide element of the striker. The guide element can have two contact webs designed to guide the torsional drive along with the striker in the circumferential direction. It is conceivable that a plurality of guide elements of the striker are provided. In this case, the number of guide elements of the striker corresponds to the number of torsional drives.

[0031] In one embodiment, the contact element of the striker engages an inner circumference of the retaining element of the bearing, in particular the bearing disk, during impact operation. When the striker reaches its end stop, the contact element is arranged radially between the intermediate shaft, in particular the neck of the intermediate shaft, and the retaining element.

[0032] In one embodiment of the hand-held power tool, the striker has at least one rotational receptacle which is designed to accommodate the rotational drive, at least during impact operation. The striker can form the rotational receptacle so that they are one-piece. The rotational receptacle can be pot-shaped, shaft-like, or bowl-like, for example. In a first position of the striker, the rotational drive can be arranged substantially outside the rotational receptacle. In a second position of the striker, the rotational drive can be inserted into the rotational receptacle. In this case, the rotational receptacle can largely accommodate the rotational drive. The rotational receptacle and the guide element of the striker can be arranged axially to one another and / or in the circumferential direction to the tool axis. The rotational receptacle and the guide element of the striker can be arranged coaxially to the tool axis, substantially within the impact mechanism housing.The racket can form both the guide element of the racket and the torsional drive so that they are one piece.

[0033] In one embodiment of the handheld power tool, the bearing forms the torsional drive. In particular, the bearing disc can form the torsional drive. This allows the bearing, in particular the bearing disc, and the torsional drive to be integrally formed.

[0034] In one embodiment, the retaining element for the rolling elements of the bearing and the torsional drive are integral. Furthermore, the bearing disc and the torsional drive can be arranged at an angle, in particular substantially perpendicular, to each other.

[0035] In an alternative embodiment, the striker forms the torsional driver, and the bearing forms the torsional receiver. In this alternative embodiment, the torsional driver of the striker and the torsional receiver of the bearing are configured such that they can interact.

[0036] In one embodiment of the handheld power tool, the torsional drive is arranged between two spring elements of the radial spring system. The radial spring system has the majority of spring elements arranged in the circumferential direction relative to the tool axis. The torsional drive can be arranged between two of the spring elements in the circumferential direction relative to the tool axis.

[0037] In one embodiment of the handheld power tool, two torsional drives are provided, which are arranged opposite one another, particularly relative to the tool axis, in the impact mechanism. The two torsional drives can be of the same type, such as two pins, two webs, or two bolts. The two torsional drives are arranged essentially within the impact mechanism housing. Furthermore, the neck of the intermediate shaft can be arranged radially between the two torsional drives.

[0038] Short description of the drawings

[0039] The invention is explained below using a preferred embodiment. The drawings show:

[0040] Fig. 1 is a schematic view of a hand-held power tool according to the invention;

[0041] Fig. 2a shows a section of a longitudinal section of a percussion mechanism of the hand-held power tool in a first working state;

[0042] Fig. 2b shows the section of the longitudinal section of the percussion mechanism in a second working state;

[0043] Fig. 3 shows a section of a further longitudinal section of the striking mechanism with a torsional drive according to the invention;

[0044] Fig. 4 a perspective longitudinal section of the striking mechanism with the torsional drive;

[0045] Fig. 5a is a perspective view of the racket;

[0046] Fig. 5b a perspective view of a bearing disc with the torsional drive;

[0047] Fig. 6 shows a section of a longitudinal section of the striking mechanism with an alternative embodiment of the torsional drive;

[0048] Description of the Embodiments Fig. 1 shows a handheld power tool 100 according to the invention, wherein it is designed here as an exemplary cordless impact wrench. The handheld power tool 100 comprises an output shaft 124, a tool holder 150 and an impact mechanism 122, e.g., a rotary or rotating impact mechanism. The handheld power tool 100 has a housing 110 with a handle 126. The handheld power tool 100 can be mechanically and electrically connected to a power supply for battery operation to form a mains-independent power supply, so that the handheld power tool 100 is designed as a battery-operated handheld power tool 100. A handheld power tool battery pack 130 serves as the power supply here. However, the present invention is not limited to battery-operated handheld power tools, but can also be applied to mains-dependent, i.e., mains-operated, handheld power tools.

[0049] The housing 110 comprises a drive unit 111 and the impact mechanism 122, wherein the drive unit 111 and the impact mechanism 122 are arranged in the housing 110. The drive unit 111 comprises an electrically commutated drive motor 114, which is supplied with power by the handheld power tool battery pack 130, and a gear unit 118. The gear unit 118 is designed as at least one planetary gear 166, see also Fig. 2. The drive motor 114 is configured such that it can be actuated, for example, via a handset 128, so that the drive motor 114 can be switched on and off. Advantageously, the drive motor 114 is electronically controllable and / or regulated, so that reversing operation and a desired rotational speed can be realized. For reversing operation, the handheld power tool 100 has a rotation direction switching element 121, which is designed as a rotation direction switch.The rotation direction switching element 121 is designed to switch the drive motor 114 between a clockwise rotation direction and a counterclockwise rotation direction. The structure and operation of a suitable drive motor are well known to those skilled in the art, which is why they will not be discussed in detail here.

[0050] The gear unit 118 is connected to the drive motor 114 via a drive shaft 116. The drive shaft 116 is mounted in the housing 110 by means of a motor-side bearing (not shown in detail). The gear unit 118 is provided to convert a rotation of the drive shaft 116 into a rotation between the gear unit 118 and the percussion mechanism 122 via an intermediate shaft 120. This conversion preferably takes place such that the intermediate shaft 120 rotates relative to the drive shaft 116 with increased torque but at a reduced rotational speed (see also Fig. 2). The intermediate shaft 120 at least partially drives the percussion mechanism 122. The gear unit 118 has a gear housing 119 arranged in the housing 110. The hand-held power tool 100 comprises a tool axis 102, wherein a rotational axis of the drive shaft 116 forms the tool axis 102.

[0051] The impact mechanism 122 is connected to the intermediate shaft 120 and comprises a striker 300 and at least one radial spring system 350 connected to the striker 300 in a rotationally fixed manner. The impact mechanism 122 generates sudden rotational impulses of high intensity during impact operation (see also Fig. 2). The intermediate shaft 120 comprises a bearing 200 (see also Figs. 2 to 4). The radial spring system 350 is rotatably mounted on the bearing 200. These sudden rotational impulses are transmitted to the output shaft 124, for example a work spindle, via the striker 300. The impact mechanism 122 comprises an impact mechanism housing 123, although the impact mechanism 122 can also be arranged in another suitable housing, such as the gear housing 119. The impact mechanism 122 is designed to drive the output shaft 124. A tool holder 150 is provided on the output shaft 124. Preferably, the tool holder 150 is molded and / or formed on the output shaft 124.Preferably, the tool holder 150 is arranged in an axial direction 132 pointing away from the drive unit 111. The tool holder 150 is designed here as a hexagon socket, similar to a bit holder, which is intended to receive an insert tool 140. The insert tool is shaped like a screwdriver bit with a polygonal external coupling 142. The type of screwdriver bit, for example, of the H EX type, is well known to those skilled in the art. However, the present invention is not limited to the use of H EX screwdriver bits; rather, other tool holders that appear appropriate to those skilled in the art can also be used, such as H EX drills, SDS-Quick insert tools, or round-shank drill chucks. Furthermore, the structure and function of a suitable bit holder are well known to those skilled in the art. The handheld power tool 100 comprises a rotational drive 500.The torsional drive 500 is provided to couple at least the striker 300 to the bearing 200 (see also Figs. 3 to 6). The torsional drive 500 is provided to rotate the radial spring system 350 along with the striker 300 during rotation of the striker 300. During impact operation, the torsional drive 500 is at least partially immersed in the striker. Furthermore, during impact operation, the torsional drive 500 is coupled to the striker 300. The torsional drive 500 is arranged essentially within the impact mechanism 122, in particular the impact mechanism housing 123. The torsional drive 500 extends axially to the tool axis 102 within the impact mechanism 122.

[0052] The handheld power tool 100 has a control unit 170 at least for controlling the drive unit 111, in particular the drive motor 114. The housing 110 at least partially accommodates the control unit 170. The control unit 170 has a microprocessor (not shown in detail). The housing 110 also comprises a power supply holding device 160. The power supply holding device 160 accommodates the handheld power tool battery pack 130 and forms a base 162 with a base. The handheld power tool battery pack 130 can be detached from the power supply holding device 160 without tools. The housing 110 also has the handle 126 and the power supply holding device 160. The handle 126 can be grasped by the user. In one embodiment, the power supply holding device 160 is arranged on the handle 126. The hand tool 100 can be parked using the stand 162.

[0053] Fig. 2a shows a longitudinal section 400 of the impact mechanism 122 of the handheld power tool 100 in a first operating state 402. In the first operating state 402, the striker 300 is arranged towards the tool holder 150. Figs. 2a and 2b show the impact mechanism 122, the intermediate shaft 120, the gear unit 118, and the output shaft 124, with the intermediate shaft 120 partially forming the gear unit 118 here, by way of example. The intermediate shaft 120 is arranged between the drive motor 114 and the tool holder 150; the drive motor 114 and the tool holder 150 are not shown here. The gear unit 118 is designed as the planetary gear 166, with a planetary stage being formed here, by way of example. In addition to the gear housing 119, the gear unit 118 comprises a gear cover 125. Here, the gear cover 125 is provided to at least partially close the gear unit 118 from the drive motor 114.The gear cover 125 is arranged between the planetary gear 166 and the drive motor 114. The planetary gear 166 also includes a ring gear 129, wherein the ring gear 129 and the gear cover 125 are, for example, integrally formed. The intermediate shaft 120 has an intermediate shaft bearing 164. The gear cover 125 includes a receptacle for the intermediate shaft bearing 164, such that the receptacle for the intermediate shaft bearing 164 accommodates the intermediate shaft bearing 164. The intermediate shaft bearing 164 enables the intermediate shaft 120 to rotate relative to the gear cover 125.

[0054] The drive motor 114 comprises the drive shaft 116, which is mounted in the housing 110 by means of a drive shaft bearing 117. The drive shaft 116 is not shown in Fig. 2. The drive shaft bearing 117 is designed, for example, as a needle bearing. Here, the drive shaft bearing 117 is arranged at an end of the drive motor 114 facing the tool holder 150. The drive shaft 116 extends into the intermediate shaft 120 through the planetary gear 166. The drive shaft bearing 117 is arranged in the intermediate shaft 120.

[0055] The impact mechanism 122 is connected to the drive motor 114 via the planetary gear 166. The impact mechanism 122 is configured here as a V-groove impact mechanism. The impact mechanism 122 is arranged between the drive motor 114 and the tool holder 150. The striker 300 and the radial spring system 350 are arranged in the impact mechanism housing 123. The impact mechanism 122 comprises an impact mechanism cover 127, wherein the impact mechanism cover 127 closes off the impact mechanism 122 in the direction of the drive motor 114. The impact mechanism cover 127 is arranged between the drive motor 114 and the planetary gear 166. Here, the impact mechanism cover 127 and the gear cover 125 are, for example, integrally formed, with the impact mechanism cover 127 then forming the ring gear 129.

[0056] The striker 300 is mounted on the intermediate shaft 120 by means of impact mechanism balls 310. The impact mechanism balls 310 are provided to move the striker 300 at least partially in the direction of the drive motor 114. Fig. 2a shows the striker 300 in a position facing the tool holder 150. The striker 300 can also be arranged in a position facing the drive motor 114, see Fig. 2b. In the position facing the tool holder 150, the striker 300 rests against a rear end of the tool holder 150, i.e., against the output shaft 124, by means of two impact cams 312, although this is not shown in detail. In the position facing the drive motor 114, the striker 300 is arranged at a distance from the tool holder 150.

[0057] In the radial spring system 350, spring elements 352 are arranged radially offset from the tool axis 102 and circumferentially relative to the tool axis 102. The radial spring system 350 has a plurality of spring elements 352, with eight spring elements 352 being provided, for example (see also Fig. 5). The striker 300 comprises receptacles 302 for the spring elements 352 of the radial spring system 350. A number of receptacles 302 for the radial spring system 350 corresponds to the plurality of spring elements 352. Here, the receptacles 302 for the radial spring system 350 are cup-shaped. A web 305 is formed between each two adjacent spring elements 352 (see Fig. 5). The spring elements 352 are, for example, shaped as spiral springs. The radial spring system 350 is connected to the striker 300 in a rotationally fixed manner, wherein the spring elements 352 and the receptacles 302 for the spring elements 352 are connected at least in a form-fitting manner.Here, the spring elements 352 are each inserted into one of the receptacles 302 for the spring elements 352 of the radial spring system 350.

[0058] The bearing 200 of the intermediate shaft 120 arranges the radial spring system 350 rotatably relative to the intermediate shaft 120 in the percussion mechanism housing 123. The bearing 200 of the intermediate shaft 120 is designed, for example, as a needle bearing 202 with needles 222 as rolling elements 220. The radial spring system 350 bears against the bearing 200. The intermediate shaft 120 comprises a planet carrier 280 of the planetary gear 166. The bearing 200 is arranged between the radial spring system 350 and the planet carrier 280. In addition to the planet carrier 280, the planetary gear 166 also has planet gears 282, with the planet carrier 280 rotatably supporting the planet gears 282 relative to the intermediate shaft 120 by means of a bolt 284. The bearing 200 is arranged axially between the planet carrier and the radial spring system 350. The radial spring system 350 rests against a bearing disk 210 of the bearing 200.

[0059] The bearing disk 210 is arranged in the direction of the tool holder 150. For example, the bearing disk 210 is formed as a disk. The bearing disk 210 is arranged axially between the rolling elements 220 and the radial spring system 350. Furthermore, one side of the bearing disk 210 is essentially flat, so that the needles 222 lie flat against the bearing disk 210. The planet carrier 280 is at least partially formed as a bearing cover disk 240 of the bearing 200. For example, the planet carrier 166 and the bearing cover disk 240 are integral. Furthermore, the bearing cover disk 240 is arranged in the direction of the drive motor 114. In addition, the bearing cover disk 240 is arranged opposite the bearing disk 210. The bearing cover disk 240 supports the rolling elements 220 and accommodates them flatly. The bearing 200 is formed by the bearing disc 210, the bearing cover disc 240 and the rolling elements 220.The bearing 200, in particular the bearing disk 210, comprises a retaining element 244. The retaining element 244 is provided to radially retain the rolling elements 220 of the bearing 200. The retaining element 244 is arranged radially between the tool axis 102 and the rolling elements 220 and is formed as a circumferential shoulder 245. The bearing disk 210 and the retaining element 244 are integral here. Here, the bearing cover disk 240 has a radial stop 246 designed to retain the rolling elements 220. The radial stop 246 is formed as a circumferential web and is integral with the bearing cover disk 240. The radial stop 246 is arranged radially between the rolling elements 220 and the impact mechanism housing 123.

[0060] The bearing cover plate 240 forms the radial stop 246, so that they are one piece.

[0061] The striker 300 includes a contact element 340 on an inner circumference, wherein the contact element 340 is received by a neck 168 of the intermediate shaft 120. The contact element 340 is designed to slide on the neck 168 of the intermediate shaft 120. During impact operation, the contact element 340 of the striker 300 engages an inner circumference 201 of the retaining element 244 of the bearing 200, in particular the bearing disk 210 (see also Fig. 2b).

[0062] Fig. 2b shows a section of the longitudinal section 400 of the striking mechanism 122 in a second operating state 404. In the first operating state 404, the striker 300 is arranged in the direction of the drive motor 114. When the striker 300 reaches its end stop, the contact element 340 is arranged radially between the intermediate shaft 120, in particular the neck 168 of the intermediate shaft 120, and the retaining element 244.

[0063] Fig. 3 shows a detail of a further longitudinal section 420 of the percussion mechanism with a torsional drive 500 according to the invention, wherein the percussion mechanism 122 is shown in the first working state 402. The torsional drive 500 is arranged radially, in particular to the tool axis 102, between the intermediate shaft 120 and the percussion mechanism housing 123. In addition, the torsional drive 500 is arranged axially between the planetary gear 166 and the output shaft 124. The torsional drive 500 extends axially along the tool axis 102. By way of example, two torsional drives 500 are formed here, which are shaped like a pin 502, see also Figs. 4 and 5. The two torsional drives 500 are arranged in the circumferential direction to the tool axis 102. The striker 300 comprises at least one guide element 320, see also Figs. 4 and 5. The guide element 320 of the striker 300 is intended to receive the rotational drive 500, see also Fig. 4.For example, the striker 300 here forms the guide element 320 so that they are a single piece. The guide element 320 of the striker 300 is arranged in the circumferential direction relative to the tool axis 102 and extends axially, in particular relative to the tool axis 102 (see also Figs. 4 and 5). For example, the guide element 320 of the striker 300 is formed in the form of two contact webs 322. Here, two guide elements 320 are formed for each torsional drive 500 (see also Figs. 4 and 5). The guide element 320 of the striker 300 at least partially encompasses the torsional drive 500. During impact operation, the torsional drive 500 bears against the guide element 320 of the striker 300. The striker 300 further comprises at least one rotational receptacle 330. The rotational receptacle 330 is intended to accommodate the rotational driver 500, at least during the striking operation. The striker 300 forms the rotational receptacle 330 so that they are integrally formed.For example, the rotational receptacle 330 is shaped like a shaft 332. In a first position of the striker 300, the rotational drive 500 is arranged substantially outside the rotational receptacle 330. Typically, the striking mechanism 122 is in the first working state 402, see also Fig. 4. In a second position of the striker 300, the rotational drive 500 is immersed in the rotational receptacle 330, although this is not shown in detail. The rotational receptacle 330 and the guide element 320 of the striker 300 are arranged axially relative to one another and coaxially with the tool axis 102, essentially within the impact mechanism housing 123. The striker 300 is integrally formed with the guide element 320 and the rotational drive 330. The number of rotational receptacles 330 corresponds to the number of rotational drives 500. Two rotational receptacles 330 are provided here, for example. The bearing 200, in particular the bearing disk 210, forms the rotational drive 500.In addition, the retaining element 244 for the rolling elements 220 of the bearing 200 and the torsional drive 500 are integrally formed. Furthermore, the bearing disk 210 and the torsional drive 500 are arranged at an angle, in particular substantially perpendicular, to one another. Fig. 4 shows a perspective longitudinal section 430 of the percussion mechanism 122 with the torsional drive 500, wherein the percussion mechanism 122 is shown in the first operating state 402. The two torsional drives 500 are substantially located within the percussion mechanism housing 123, with the neck 168 of the intermediate shaft 120 being arranged radially between the two torsional drives 500.

[0064] Fig. 5a shows a perspective view 414 of the striker 300. The torsional driver 500 is arranged between two spring elements 352 of the radial spring system 350, whereby the spring elements 352 are not shown here. Shown are the spring receptacles 302, into which the spring elements are inserted in an assembled state of the striking mechanism 122. Fig. 5b shows a perspective view 440 of the bearing disk 210 with the torsional driver 500. The two pin-shaped torsional drivers 500, 502 are arranged opposite one another.

[0065] Fig. 6 shows a detail 450 of a longitudinal section of the striking mechanism 122 with an alternative embodiment of the torsional drive 500. The striking mechanism 122 is shown in the first operating state 402. The torsional drive 500 is designed here in the manner of a ring gear 504. The bearing disk 210 and the torsional drive 500 as the ring gear 504 are arranged at an angle to one another and are integral. The guide element 320 of the striker 300 is designed in the manner of a gear 324. The torsional drive 500 as the ring gear 504 can engage positively in the guide element 320 as the gear 324. The torsional receptacle 330 is designed here in the manner of an annular groove 334.

Claims

Claims 1 . Hand-held power tool (100) with a housing (110), with a drive motor (114), with an intermediate shaft (120), wherein the intermediate shaft (120) can be driven by the drive motor (114), with a percussion mechanism (122) which has a striker (300) and a radial spring system (350) which is rotationally connected to the striker (300), wherein the percussion mechanism (122) can be driven at least partially by the intermediate shaft (120), and with a tool holder (150) for receiving an insert tool (140), wherein the tool holder (150) can be driven by means of the percussion mechanism (122), in particular the striker (300), and / or the intermediate shaft (120), wherein the intermediate shaft (120) has at least one bearing (200) against which the radial spring system (350) rests, characterized by a rotational driver (500) which is designed to drive at least the striker (300) to be coupled to the bearing (200).

2. Hand tool (100) according to claim 1, characterized in that the rotational drive (500) is arranged radially between the intermediate shaft (120) and a percussion mechanism housing (122).

3. Hand tool (100) according to claim 1 or 2, characterized in that the intermediate shaft (120) has at least one planet carrier (280), wherein the bearing (200) is arranged between the radial spring system (350) and the planet carrier (280).

4. Hand tool (100) according to one of claims 1 to 3, characterized in that the radial spring system (350) bears against a bearing disc (210) of the bearing (100).

5. Hand tool (100) according to claim 3 or 4, characterized in that the planet carrier (280) is at least partially designed as a bearing cover plate (240).

6. Hand tool (100) according to one of the preceding claims, characterized in that the striker (300) has at least one guide element (320) which is designed to receive the rotational drive (500).

7. Hand tool (100) according to claim 6, characterized in that the striker (300) has at least one rotational receptacle (330) which is designed to receive the rotational driver (500) at least during an impact operation.

8. Hand tool (500) according to one of the preceding claims, characterized in that the bearing (200) forms the rotational drive (500).

9. Hand tool (100) according to one of the preceding claims, characterized in that the rotational drive (500) is arranged between two spring elements (352) of the radial spring system (350).

10. Hand tool (100) according to one of the preceding claims, characterized in that two rotational drivers (500) are provided, which are arranged opposite one another in the impact mechanism (122).

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