Hand-held power tool

Abstract

The invention relates to a hand-held power tool (100) having: a housing (102); 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. According to the invention, the intermediate shaft (120) has at least one bearing (200) and the radial spring system (350) sits against 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. It is proposed that the intermediate shaft have at least one bearing, wherein the radial spring system bears against the bearing.

[0009] The invention provides a handheld power tool with a percussion mechanism with high mass inertia, in which the radial spring system is non-rotatably connected to the striker, so that the radial spring system provides an additional striker mass. The CN 212330861 U lacks the intermediate shaft bearing, so that the percussion mechanism springs of the CN 212330861 U are not rotatable relative to the intermediate shaft. The handheld power tool can be designed as an electrically operated handheld power tool. The electrically operated handheld power tool can be designed as a mains-operated or battery-operated handheld power tool. For example, the handheld power tool can be designed as a rotary impact wrench.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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 protrude 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 being essentially parallel to the tool axis. Whereas “radial” should be understood as being essentially perpendicular to the tool axis. The radial spring system is a spring system that has spring elements arranged radially offset and / or in the circumferential direction 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 are possible. The majority of the spring elements can be arranged in the circumferential direction to the tool axis.The racket has at least one receptacle for the radial spring system. A number of receptacles for the radial spring system can correspond to the majority of the spring elements. The receptacle for the radial spring system can be pot-shaped, shell-like, or shaft-like. It is conceivable that the receptacle for the radial spring system can be pin-like, pin-like, or web-like, although other shapes are also conceivable. A combination for the receptacle for the radial spring system is also possible, such as a pot-like design 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, which increases the racket mass in order to increase the racket's mass inertia.The spring elements can be designed, for example, as spiral springs, barrel springs, conical springs, chimney springs, profile springs or as a combination thereof.

[0016] 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 attached. Both options increase the striker's mass inertia, as the striker mass is higher than with a single coil spring.

[0017] 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 holder. 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 support.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Alternatively, it is conceivable for the radial spring system to partially rest on the bearing disk. In this case, it would be possible for a first number of spring elements to rest on the bearing disk and a second number of spring elements to be arranged at a distance from the bearing disk. The second number of spring elements would rest on the bearing disk from a definable winding point during winding of the striker. This could then enable two radial spring systems. In one embodiment of the hand-held power tool, the planet carrier is at least partially designed as a bearing cover disk. The planet carrier and the bearing cover disk can be one-piece. The bearing cover disk is arranged in the direction of the drive motor. The bearing cover disk can be arranged opposite the bearing disk. The bearing cover disk is designed at least to support the rolling elements.The bearing cover plate can have a recess dependent on the rolling element, such as a cup-like recess for the rolling elements in balls, or a flat recess for rollers or needles. The bearing race and the bearing cover plate, together with the rolling elements, form the bearing.

[0024] 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.

[0025] The striker may have a contact element on an inner circumference. The contact element may be received by a neck of the intermediate shaft. The contact element may slide on the neck of the intermediate shaft.

[0026] 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 an end stop, the contact element is arranged radially between the intermediate shaft, in particular the neck of the intermediate shaft, and the retaining element. In one embodiment of the hand-held power tool, an air spring can be formed between the guide element and the neck of the intermediate shaft, at least during impact operation. If the striker is moved axially during impact operation, the air spring can be created in the first embodiment. The air spring can form an air chamber or an air cushion. The air spring can be formed radially between the neck of the intermediate shaft and an outer diameter of the striker. The air spring can then apply an additional spring force.

[0027] In one embodiment of the handheld power tool, the radial spring system comprises a plurality of first spring elements and a plurality of second spring elements. The plurality of first spring elements can be spring elements with a first spring rate, such as thick springs, for example. The plurality of second spring elements can be spring elements with a second spring rate, such as thin springs. The plurality of first spring elements and the plurality of second spring elements can have different spring rates, diameters, shapes, and / or spring characteristics. The plurality of first spring elements and the plurality of second spring elements can also be different spring types, such as a combination of coil springs and barrel springs.The number of the plurality of first spring elements and the plurality of second spring elements can each be even, such as four first spring elements and four second spring elements, two first spring elements and six second spring elements, although other suitable combinations are also conceivable. It is also conceivable for the plurality of first spring elements and the plurality of second spring elements to each be odd. The plurality of first spring elements and the plurality of second spring elements can each be arranged in the circumferential direction around the tool axis.

[0028] Alternatively, it is possible for the plurality of first spring elements and the plurality of second spring elements to be formed by the same spring elements. In this case, a different spring force can then be formed by a shoulder in the striker or the bearing disk, so that the respective spring rate is achieved by means of preloaded springs. In one embodiment of the handheld power tool, the plurality of first spring elements are arranged alternately with the plurality of second spring elements. In this case, a spring element of the plurality of first spring elements can follow a spring element of the plurality of second spring elements in the circumferential direction, and vice versa.

[0029] In one embodiment of the handheld power tool, at least two identical spring elements are adjacent to one another. The two identical spring elements can each be two spring elements of the plurality of first spring elements or two spring elements of the plurality of second spring elements. The two identical spring elements can be adjacent to the tool axis in the circumferential direction. If the spring receptacle is designed as an annular groove, the annular groove can be arranged in the circumferential direction of the tool axis so that it is concentric with the tool axis. A connecting element of the spring elements can be designed complementarily to the spring receptacle so that a connection can be established between the spring elements and the spring receptacle.

[0030] In one embodiment of the handheld power tool, the spring elements are arranged opposite one another. The spring elements can be arranged opposite one another radially to the tool axis.

[0031] Short description of the drawings

[0032] The invention is explained below using preferred embodiments. The drawings show:

[0033] Fig. 1 is a schematic view of a hand-held power tool according to the invention;

[0034] Fig. 2a shows a section of a longitudinal section of a percussion mechanism of the hand-held power tool in a first working state;

[0035] Fig. 2b shows the section of the longitudinal section of the percussion mechanism in a second working state;

[0036] Fig. 3a is a perspective view of the racket;

[0037] Fig. 3b shows a first cross-section of a striker of the striking mechanism;

[0038] Fig. 3c a second cross-section of the racket;

[0039] Description of the embodiments

[0040] 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.

[0041] 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.

[0042] 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.The impact mechanism 122 is connected to the intermediate shaft 120 and comprises a striker 300 and at least one radial spring system 350 rotatably connected to the striker 300. 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 Fig. 2). 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 formed 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, in the manner of 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 HEX type, is well known to those skilled in the art. However, the present invention is not limited to the use of HEX screwdriver bits; rather, other tool holders that appear appropriate to those skilled in the art can also be used, such as HEX 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.

[0043] 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 standing surface. 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.

[0044] 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.

[0045] The drive motor 114 comprises the drive shaft 116, wherein the drive shaft 116 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 here as a needle bearing, for example. 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 projects into the intermediate shaft 120 through the planetary gear 166. The drive shaft bearing 117 is arranged in the intermediate shaft 120. The impact mechanism 122 is connected to the drive motor 114 by means of the planetary gear 166. The impact mechanism 122 is designed 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 striking mechanism housing 123.The striking mechanism 122 comprises a striking mechanism cover 127, wherein the striking mechanism cover 127 closes off the striking mechanism 122 in the direction of the drive motor 114. The striking mechanism cover 127 is arranged between the drive motor 114 and the planetary gear 166. Here, the striking mechanism cover 127 and the gear cover 125 are, for example, integrally formed, with the striking mechanism cover 127 then forming the ring gear 129.

[0046] 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.

[0047] 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. 3). 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. 3). 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.

[0048] 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.

[0049] The radial spring system 350 rests on a bearing washer 210 of the bearing 200.

[0050] 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 210. 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.

[0051] The intermediate shaft 120 comprises a guide element 250. The striker 300 comprises a guide receptacle 330. The guide element 250 is intended to guide the striker 300 by means of the guide receptacle 330, at least during the impact operation of the impact mechanism 122. The intermediate shaft 120, in particular the planetary carrier 280, has the guide element 250 and forms it in the circumferential direction relative to the tool axis 102. The guide element 250 and the planetary carrier 280 are integral. The guide element 250 is formed here as a circumferential web. The guide receptacle 330 is integral with the striker 300 and formed as a circumferential groove. The guide receptacle 330 encloses the receptacles 302 for the spring elements 352 in the circumferential direction to the tool axis 102. In impact operation, the guide element 250 plunges into the guide receptacle 330 and thereby guides the striker 300 in the axial direction to the tool axis 102, see also Fig. 2b.

[0052] During impact operation, an air spring 360 can be formed between the guide element 250 and the spring retainer 330. When the striker 300 is moved axially during impact operation, the air spring 360 is created by forming an air chamber. The air spring 360 is created radially between the intermediate shaft 120 and an outer diameter of the striker.

[0053] 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).

[0054] 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.

[0055] Fig. 3 shows three views 410, 412, 414 of the striker 300 of the striking mechanism 122. Fig. 3a shows a perspective view 414 of the striker 300. The pot-shaped spring receptacles 302 into which the spring elements 352 can be inserted are shown; see Fig. 2. Fig. 3b shows a first cross-section 410 of the striker 300. The eight spring elements 352 are arranged in the circumferential direction of the tool axis 102. The eight spring elements 352 are of the same type. Furthermore, the eight spring elements 352 are arranged opposite one another. Between each two spring elements 352, a web 305 is formed in the striker 300, which contributes to a higher mass inertia of the striker 300; see also Figs. 2, 3a, 3c. The contact element 340 is sleeve-shaped. A second cross-section 412 of the striker 300 is shown in Fig. 3c.Here, the radial spring system 350 comprises a plurality of first spring elements 354 and a plurality of second spring elements 356. The majority of the first spring elements 354 have a first spring rate that is higher. The majority of the second spring elements 356 have a second spring rate that is lower. The majority of the first spring elements 354 and the majority of the second spring elements 356 are each shaped as spiral springs. Here, four first spring elements 354 and four second spring elements 356 are formed. The first and second spring elements 354, 356 are formed on the striker 300 in the circumferential direction relative to the tool axis 102. For this purpose, the striker 300 has a plurality of first spring receptacles 304 and a plurality of second spring receptacles 306.The majority of the first and second spring receptacles 304, 306 are each pot-shaped, wherein the majority of the first and second spring receptacles 304, 306 correspond to the majority of the first and second spring elements 354, 356. The majority of the first and second spring elements 354, 356 are arranged here such that at least one of the second spring elements 356 is arranged next to the first spring element 354 in the circumferential direction, and vice versa. In addition, one of the first spring elements 354 is arranged next to one of the first spring elements 354 in the circumferential direction. One of the second spring elements 356 is arranged next to one of the second spring elements 356 in the circumferential direction. One of the first spring elements 354 is arranged opposite one of the first spring elements 354. One of the first spring elements 356 is arranged opposite one of the second spring elements 356.

Claims

Claims 1. Hand-held power tool (100) with a housing (102), with a drive motor (114), with an intermediate shaft (120), wherein the intermediate shaft (120) can be driven by the drive motor (114), with an impact mechanism (122) which has a striker (300) and a radial spring system (350) which is rotationally connected to the striker (300), wherein the impact 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 impact mechanism (122), in particular the striker (300), and / or the intermediate shaft (120), characterized in that the intermediate shaft (120) has at least one bearing (200), wherein the radial spring system (350) bears against the bearing (200).

2. Hand tool (100) according to claim 1, 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).

3. Hand tool (100) according to claim 1 or 2, characterized in that the radial spring system (350) bears against a bearing disc (210) of the bearing (200).

4. Hand tool (100) according to claim 2 or 3, characterized in that the planet carrier (280) is at least partially designed as a bearing cover plate (240).

5. Hand tool (100) according to one of the preceding claims, characterized in that the intermediate shaft (120) has a guide element (250) and the striker (300) has a guide receptacle (330), wherein the guide element (250) is designed to guide the striker (300) by means of the guide receptacle (330) at least during an impact operation of the impact mechanism (122).

6. Hand tool (100) according to claim 5, characterized in that at least during the impact operation an air spring (360) can be formed between the guide element (250) and a neck (168) of the intermediate shaft (120).

7. Hand tool (100) according to one of the preceding claims, characterized in that the radial spring system (350) has a plurality of first spring elements (354) and a plurality of second spring elements (356).

8. Hand tool (100) according to claim 7, characterized in that the plurality of first spring elements (354) are arranged alternately with the plurality of second spring elements (356).

9. Hand tool (100) according to claim 7, characterized in that at least two similar spring elements (352, 354, 356) are adjacent to one another.

10. Hand tool (100) according to one of claims 7 to 9, characterized in that the spring elements (352, 354, 356) are arranged opposite one another.

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