hand tool

Abstract

A handheld power tool (100) is disclosed, comprising a main housing (200) having a longitudinal axis (202), a head housing (300) rotatably engaged with the main housing (200) to position the head housing (300) at multiple angles with respect to the longitudinal axis (202) of the main housing (200), a drive motor (114) having a drive shaft (116) and arranged in the main housing (200), and a linkage (400) defining a rotational axis (402) of the head housing (300) with respect to the main housing (200). It is proposed that the head housing (300) has a rotary impact mechanism (122).

Description

The present invention relates to a hand-held power tool according to the preamble of claim 1.Prior ArtEP 1 943 060 B1 discloses a hand-held power tool having a main housing and a head section.Disclosure of the InventionThe present invention is directed to a hand-held power tool having a main housing having a longitudinal axis, a head housing rotatably engaged with the main housing for locating the head housing at multiple angles with respect to the longitudinal axis of the main housing, a drive motor having a drive shaft and disposed in the main housing, and a linkage mechanism defining a rotational axis of the head housing with respect to the main housing. It is proposed that the head housing has a rotary percussion mechanism.The invention provides a hand-held power tool having the rotary impact mechanism disposed in the head housing, whereby an area of use for a user can be increased by the user being able to place the head housing at various angles to the main housing.The hand-held power tool can be designed as an electrically operated hand-held power tool. The electrically operated hand-held power tool can be designed as a mains-operated or as a battery-operated hand-held power tool. For example, the hand-held power tool can be designed as a rotary impact wrench.A housing of the hand-held power tool includes the main housing having the longitudinal axis and the head housing rotatably engaged with the main housing. The housing can be designed as a shell housing. In this case, the main housing and / or the head housing can each be designed as a shell housing having at least two half shells. The main housing may have a substantially cylindrical shape such that an axis of symmetry of the main housing may be the longitudinal axis of the main housing. The main housing has the drive motor. The head housing is rotatably engaged with the main housing. The head housing can be arranged on the main housing in an angular range of 90° to 180° relative to the longitudinal axis of the main housing.The drive motor can be designed as an electrically commutated drive motor, in particular as at least one electric motor. The drive motor is designed in such a way that it can be actuated via a manual switch. If the hand switch is operated by the user, the drive motor is switched on and the hand-held power tool is put into operation. If the manual switch is accordingly no longer actuated by the user, the drive motor is switched off. The drive motor is preferably electronically controllable and / or regulable in such a way that a reversing operation and a specification for a desired rotational speed can be realized. In the reversing mode, the drive motor can be switchable between a clockwise direction of rotation and a counterclockwise direction of rotation. To switch over the drive motor in the reversing mode, the hand-held power tool can have a rotation direction switching element, in particular a rotation direction switching device. The drive motor has the drive shaft, which can be driven accordingly. A rotational axis of the drive shaft may be coaxial with the longitudinal axis of the main housing. The drive shaft is mounted in the main housing by means of at least one drive shaft bearing. The drive motor can drive at least the rotary percussion mechanism and a tool holder by means of the drive shaft. The tool holder can be connected to the rotary percussion mechanism in a drive-related manner. The drive shaft bearing can be designed, for example, as a ball bearing, a rolling bearing or a sliding bearing. The drive shaft bearing is arranged at an end of the drive motor facing the tool holder. The drive shaft can have a further drive shaft bearing which is arranged on an end facing away from the drive motor. Thus, the drive shaft can then be rotatably mounted in the main housing by means of the drive shaft bearing and the further drive shaft bearing.The articulated gear is designed to transmit a rotation of the drive shaft to the rotary percussion mechanism. In addition, the articulation gear is configured to arrange the head housing relative to the main housing. The axis of rotation of the linkage may be transverse to the longitudinal axis of the main housing. The head housing may then be disposed about the axis of rotation of the linkage relative to the main housing.The rotary percussion mechanism is designed to be operated in a percussion mode. The rotary percussion mechanism generates high torque peaks during the percussion operation in order to thereby release tightly seated connecting means or to fasten connecting means. The rotary percussion mechanism has a club and a rotary percussion mechanism spring. The rotary percussion mechanism can be connected to the drive motor by means of the articulated gear. The rotary percussion mechanism can be designed, for example, as a V-groove percussion mechanism. The rotary percussion mechanism can be arranged between the drive motor and the tool holder. The rotary percussion mechanism has a rotary percussion mechanism housing in which the percussion mechanism and the rotary percussion mechanism spring are arranged. In addition, the rotary striking mechanism has a rotary striking mechanism cover. The rotary striking mechanism cover can close the rotary striking mechanism in the direction of the articulated transmission.The head housing can have the tool receptacle, which is designed as an inner tool receptacle, such as a bit receptacle, for example, and / or as an outer tool receptacle, such as a nut receptacle, for example. It is also conceivable for the tool holder to be designed as a drill chuck. The tool holder can hold insert tools, such as, for example, helical bits or socket wrench, so that a user can produce screw connections from a fastening element to a fastening carrier. The rotary percussion mechanism drives the tool holder. An axis of rotation of the tool holder can form a tool axis. In particular, "axial" is to be understood to mean substantially parallel to the longitudinal axis and / or to the tool axis. Whereas, "radial" is to be understood to mean substantially perpendicular to the longitudinal axis and / or to the tool axis.In addition, the hand-held power tool comprises an energy supply, wherein the energy supply is provided for battery operation by means of batteries, in particular hand-held power tool battery packs, and / or for grid operation. The power supply may be disposed in the main housing. In a preferred embodiment, the energy supply is designed for battery operation. In the context of the present invention, a "hand-held power tool battery pack" is intended to mean a connection of at least one battery cell and one battery pack housing. The handheld power tool rechargeable battery pack is advantageously designed for supplying energy to commercially available battery-operated handheld power tools. The at least one battery cell can be designed, for example, as a Li-ion battery cell having a rated voltage of 3.6 V. By way of example, the handheld power tool battery pack can comprise up to ten battery cells, wherein a different number of battery cells is also conceivable. An embodiment as a battery-operated hand-held power tool and also the operation as a mains-operated hand-held power tool are sufficiently known to the person skilled in the art, for which reason the details of the energy supply will not be discussed here.The hand-held power tool can have a control unit at least for controlling the drive motor. The control unit may be disposed in the main housing and / or in the head housing.In one embodiment of the hand-held power tool, the rotary percussion mechanism is connected to the articulated transmission. The rotary percussion mechanism is connected in terms of drive technology to the articulated transmission. In this case, the rotary percussion mechanism housing can be connected to a part of a link mechanism housing, such that the rotary percussion mechanism, in particular a rotary percussion mechanism housing, can be rotated about the axis of rotation of the link mechanism. Another part of the articulation housing may be connected to the main housing. The articulation gear comprises the articulation gear housing, which is arranged substantially between the main housing and the head housing.In one embodiment of the hand-held power tool, the rotary percussion mechanism has an intermediate shaft which is designed to engage with the articulated transmission. The drive shaft can drive the intermediate shaft via the articulated transmission. The striker and the rotary impact mechanism spring may be arranged circumferentially around the intermediate shaft. The striker can be mounted on the intermediate shaft by means of striking mechanism balls. In addition, the striking mechanism balls are designed to move the striking element at least partially, in particular axially, in the direction of the articulated gear mechanism. The club can be arranged in a position facing the tool holder or in a position facing the articulated gear. In the position facing the tool holder, the striker can abut a rear end of the tool holder by means of at least one striking cam. Here, for example, two striking cams are provided, wherein more than two striking cams are also conceivable. In the position facing the articulated gear, the striker can be arranged at a distance from the tool holder. The striking mechanism balls are designed to pull up the rotary striking mechanism from a triggering torque, which can be applied to the tool holder, in that the striking mechanism balls move, in particular displace, the striking mechanism from the position facing the tool holder counter to a spring force of the rotary striking mechanism spring into the position facing the articulated transmission. The performed spring force of the rotary impact mechanism spring is stored as the performed clamping work. As soon as the striker reaches the position facing the articulated transmission, the striker can be guided back into the position facing the tool holder by means of the rotary striking mechanism spring. In this case, the clamping work performed by the rotary percussion spring is released, as a result of which the striker is guided into the position facing the tool holder. The club can perform a rotational movement and an axial movement.In one embodiment of the hand-held power tool, the intermediate shaft has at least one crown wheel. The intermediate shaft can be connected to the crown gear in a form-fitting, force-fitting and / or firmly bonded manner. In this case, the intermediate shaft can have, for example, a pin or bolt and the crown gear can have a complementary receptacle. The pin or bolt can then engage in the complementary receptacle of the crown gear and produce a connection. It is possible for the intermediate shaft to form the crown gear, then to be integral. The crown gear is arranged on the intermediate shaft in a side facing the articulated transmission.In one embodiment of the hand-held power tool, the articulated gear has a crown gear which is designed to connect the rotary percussion mechanism to the drive motor in terms of drive technology. The crown gear can be arranged substantially within the articulation housing. The crown gear has at least one crown gear. It is possible for the crown gear to have two crown gears arranged opposite one another. The crown gear of the intermediate shaft is configured to engage with the crown gear of the articulated transmission.In one embodiment of the hand-held power tool, a gear mechanism is arranged in the main housing, which is designed to connect the drive motor to the articulated gear mechanism in a drive-driven manner. The transmission is arranged between the drive motor and the articulated transmission. The transmission can be designed as at least one planetary gear, wherein it can be shifted, for example. The planetary gear can have at least one planetary stage. In a shiftable transmission, it is possible to switch between at least two gear stages by means of at least one gear switching element, in particular a gear change-over switch. The transmission may include a transmission housing, wherein the transmission housing may be substantially disposed in the main housing.In one embodiment of the hand-held power tool, the gear mechanism has a transmission shaft which is designed to engage with the articulated gear mechanism. The transmission shaft can be designed as a transmission output shaft. The transmission shaft is configured to transmit the rotation of the drive shaft to the articulated transmission. The transmission shaft can have a planetary carrier. The planet carrier of the transmission shaft can then be an element of the transmission, in particular of the planetary transmission. The articulated gear housing has at least one opening, into which the transmission shaft can engage. The opening of the articulated transmission housing can be formed, for example, in the shape of a segment of a circle.In one embodiment of the hand-held power tool, the transmission shaft has at least one crown wheel. The crown gear of the transmission shaft is configured to engage with the crown gear and transmit rotations. The crown gear of the transmission shaft is formed on the transmission shaft at an end facing the crown gear transmission. The crown wheel of the transmission shaft can be connected to the transmission shaft in a form-fitting, force-fitting and / or materially integral manner. Here, the transmission shaft can have, for example, a pin or bolt which can receive the crown wheel. It is also conceivable that the crown wheel and the transmission shaft are integral. The planet carrier of the transmission shaft can be arranged, in particular designed, opposite the crown gear of the transmission shaft.In one embodiment of the hand-held power tool, the articulated gear mechanism has a servomotor which is designed to move the head housing about the axis of rotation to the main housing. The servomotor can be arranged substantially parallel to the axis of rotation of the articulated gear in the articulated gear, in particular the articulated gear housing. The actuator motor, after activation, can move and / or pivot the head housing relative to the main housing.In one embodiment of the hand-held power tool, the articulated gear mechanism has fixing magnets which are designed to fix the head housing relative to the main housing. The locking magnets can be arranged at least partially substantially within the articulated transmission housing. The fixing magnets can be arranged on the articulated gear housing in the circumferential direction to the axis of rotation of the articulated gear. The detent magnets allow a desired angle between the head housing and the main housing to be adjustable. In addition, the locking magnets may lock the head housing such that the head housing remains fixed relative to the main housing.In the main housing, the drive motor, the transmission, and the transmission shaft may be disposed substantially along the longitudinal axis of the main housing. The articulated gear can be arranged between the gear and the rotary percussion mechanism. The articulation gear is configured to connect the main housing to the head housing. The rotary percussion mechanism can be arranged between the articulated gear and the tool holder. The articulated transmission is designed to transmit the rotations of the transmission shaft to the rotary percussion mechanism, in particular the intermediate shaft.Brief Description of the DrawingsThe invention is explained below with reference to a preferred embodiment. The drawings show: FIG. 1 shows a schematic view of a hand-held power tool according to the invention; FIG. 2a is a schematic side view of a rotary percussion mechanism, a link mechanism and a gear mechanism; FIG. 2 bshows a longitudinal section of the schematic side view; FIG. 3 is a perspective view of the rotary percussion mechanism and the articulated gear mechanism with a servomotor; FIG. 4a is a perspective view of an intermediate shaft with a one-piece crown gear; FIG. 4 bshows an exploded view of the intermediate shaft with a two-piece crown gear;DESCRIPTION OF THE EMBODIMENTSFIG. 1 shows a hand-held power tool 100 according to the invention, wherein it is designed here as an exemplary battery-operated rotary impact wrench. The hand-held power tool 100 comprises an output shaft 124, a tool holder 150 and a rotary percussion mechanism 122, for example a rotary percussion mechanism. The hand-held power tool 100 has a housing 110 comprising a main housing 200 and a head housing 300. The main housing 200 has a longitudinal axis 202. The head housing 300 is rotatably engageable with the main housing 200 and is positionable at a plurality of angles relative to the longitudinal axis 202. The main housing 200 includes a handle 126. The main housing 200 includes a substantially cylindrical shape. The hand-held power tool 100 can be connected mechanically and electrically to a power supply for battery operation to form a power supply independent of the grid, so that the hand-held power tool 100 is designed as a battery-operated hand-held power tool 100. A handheld power tool rechargeable battery pack 130 is used here as the energy supply. However, the present invention is not limited to battery-operated hand-held power tools, but can also be used in grid-dependent, i.e. grid-operated, hand-held power tools.The main housing 200 includes a driving unit 111 disposed in the main housing 200. The drive unit 111 comprises an electrically commutated drive motor 114, which is supplied with current by the handheld power tool rechargeable battery pack 130, and a transmission 118. The transmission 118 is designed as at least one planetary transmission 166, see also FIG. 2, The drive motor 114 is designed such that it can be actuated, for example, via a manual switch 128, with the result that the drive motor 114 can be switched on and off. The drive motor 114 can advantageously be controlled and / or regulated electronically, so that a reversing operation, as well as a desired rotational speed, can be realized. For the reversing operation, the hand-held power tool 100 has a rotation direction switching element 121, which is designed as a rotation direction switcher. The rotation direction switching member 121 is configured to switch the drive motor 114 between a clockwise rotation direction and a counterclockwise rotation direction. The structure and the mode of operation of a suitable drive motor are sufficiently known to the person skilled in the art, for which reason they will not be discussed in more detail here.The transmission 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 transmission 118 is provided to convert rotation of the drive shaft 116 into rotation between the transmission 118 and the rotary impact mechanism 122. The transmission118 includes a transmission case 119 disposed in the main housing 200. A rotational axis of the drive shaft 116 may form the longitudinal axis 202 of the main housing 200.The rotary percussion mechanism 122 is designed to drive the output shaft 124. The tool holder 150 is provided on the output shaft 124. The tool holder 150 is preferably formed and / or formed on the output shaft 124, see also FIG. 2. the tool holder 150 is formed here as an internal hexagonal holder, in the manner of a bit holder, which is provided to receive an insert tool. FIGS. 2 and 3 show the tool holder 150 as an outer square holder. The insert tool is shaped in the manner of a screwdriver bit with a polygonal external coupling. However, the present invention is not limited to the use of HEX screwdriver bits, but other tool holders that appear expedient to the skilled person can also be used, such as nuts, HEX drills, SDS quick inserts or round shank drill chucks. In addition, the structure and the mode of operation of a suitable bit holder are sufficiently known to the person skilled in the art. An axis of rotation of the tool holder 150 forms a tool axis 302.The hand-held power tool 100 has a control unit 170 at least for controlling the drive unit 111, in particular the drive motor 114. The main housing 200 at least partially houses the control unit 170. The control unit 170 has a microprocessor, not shown in detail. In addition, the main housing 200 includes a power supply holder 160. The energy supply holding device 160 accommodates the handheld power tool rechargeable battery pack 130. The handheld power tool rechargeable battery pack 130 can be detached from the energy supply holding device 160 without tools.The hand-held power tool 100 comprises a link mechanism 400. The articulation gear 400 defines an axis of rotation 402 of the head housing 300 with respect to the main housing 200. The articulated gear 400 is provided to transmit a rotation of the drive shaft 116 to the rotary percussion mechanism 122. The articulation gear 400 locates the head housing 300 relative to the main housing 200. The axis of rotation 402 of the linkage 400 is transverse to the longitudinal axis 202 of the main housing 200. The rotary impact mechanism 122 is connected to the articulated gear mechanism 400 so that the articulated gear mechanism 400 drives the rotary impact mechanism 122. The articulation gear 400 comprises an articulation gear housing 410. The articulation housing 410 is substantially disposed between the main housing 200 and the head housing 300.The main housing 200 includes the drive motor 114, the transmission 118, and the transfer shaft 292, wherein the drive motor 114, the transmission 118, and the transfer shaft 292 are disposed substantially along the longitudinal axis 202 of the main housing 200. The articulated gear 400 is arranged between the gear 118 and the rotary percussion mechanism 122. The rotary impact mechanism 122 is arranged between the articulated gear 400 and the tool holder 150.FIG. 2 ashows a schematic side view of the rotary percussion mechanism 122, the articulated transmission 400 and the transmission 118. The drive motor 114, the drive shaft 116 and the energy supply holding device 160 are not shown in any more detail in FIGS. 2 and 3. The main housing 200 and the head housing 300 are not shown in detail here. The gear 118 is disposed in the main housing 200. The transmission 118 connects the drive motor 114 via the drive shaft 116 in terms of drive technology to the articulated transmission 400. For this purpose, the gear 118 is arranged between the drive motor 114 and the articulated gear 400. The transmission 118 is formed as the planetary transmission 166. The planetary gear 166 comprises at least one planetary stage 290. The planetary gear 166 also comprises planetary gears 282 and a ring gear 286, see also FIG. 2 b. The transmission 118 includes a transmission shaft 292. The transmission shaft 292 is provided to engage with the articulation gear 400. Here, the transmission shaft 292 is formed as a transmission output shaft. The transmission shaft 292 transmits the rotation of the drive shaft 116 to the linkage 400. The transmission shaft 292 comprises a planet carrier 280, see FIG. 2 b. The articulated gear housing 410 comprises an opening 412 into which the transmission shaft 292 engages, see also FIGS. 2 band 3.The articulation mechanism 400 comprises fixing magnets 420. The locking magnets 420 are provided to lock the head housing 300 relative to the main housing 200. Here, the locking magnets 420 are arranged substantially within the articulated gear housing 410 and on the articulated gear housing 410 in the circumferential direction to the rotational axis 402 of the articulated gear 400.FIG. 2 bshows a longitudinal section of the schematic side view. The rotary impact mechanism 122 comprises an intermediate shaft 120. The intermediate shaft 120 is provided to engage the articulation gear 400. The input shaft 116 drives the intermediate shaft 120 via the articulated transmission 400. The rotary impact mechanism 122 comprises an impact mechanism 500 and a rotary impact mechanism spring 520. The striker 500 and the rotary impact spring 520 are circumferentially disposed around the intermediate shaft 120. The striker 500 is mounted on the intermediate shaft 120 by means of striking mechanism balls 510. The intermediate shaft 120 comprises a circumferential shoulder 530. The circumferential shoulder 530 is shaped in the manner of a disk. The rotary impact mechanism spring 520 abuts against the circumferential shoulder 530. The intermediate shaft 120 includes a crown gear 540. Here, the crown gear 540 is integral with the intermediate shaft 120, see also FIG. 4 a. In FIG. 4 b, the crown gear 540 is two-piece with the intermediate shaft 120. The crown gear 540 is disposed on the intermediate shaft 120 in a side facing the knuckle 400.The articulation gear 400 comprises a crown gear 430. The crown gear 430 is provided for the purpose of connecting the rotary percussion mechanism 122 to the drive motor 114 in terms of drive technology. The crown gear 430 is substantially disposed inside the articulation case 410. The crown gear 430 includes at least one crown gear 432. The crown gear 540 of the intermediate shaft 120 engages with the crown gear 430, in particular the crown gear 432 of the crown gear 430. The transmission shaft 292 includes a crown gear 294. The crown gear 294 of the transmission shaft 292 is provided to engage with the crown gear 400 and transmit rotations. For this purpose, the crown gear 294 of the transmission shaft 292 is formed on the transmission shaft 292 at an end facing the crown gear 400. By way of example, the crown wheel 294 of the transmission shaft 292 is connected in a force-fitting manner to the transmission shaft 292. The transfer shaft 292 illustratively includes a pin 296 that receives the crown gear 294 of the transfer shaft 292. The planet carrier 280 of the transmission shaft 292 is disposed opposite to the crown gear 294 of the transmission shaft 292. The rotary impact mechanism 122 comprises an intermediate shaft bearing 550 which is designed to rotatably support the intermediate shaft 122. The intermediate shaft bearing 550 is here formed as a slide bearing, for example.FIG. 3 illustrates a perspective view of the rotary hammer 122 and the articulated gear 400 with a servomotor 560. Here, the articulated gear 400 comprises, by way of example, the actuating motor 560. The actuator 560 is provided to move the head housing 300 about the rotation axis 402 to the main housing 200. The servomotor 560 is arranged substantially parallel to the axis of rotation 402 of the articulated gear 400 in the articulated gear 400, in particular the articulated gear housing 410.FIG. 4 shows two embodiments of the intermediate shaft 122. FIG. 4a illustrates a perspective view of the intermediate shaft 122 with the integral crown gear 540. FIG. 4 bshows an exploded view of the intermediate shaft 122 with a two-piece crown gear 544. To receive crown gear 544, intermediate shaft 122 includes an example pin 542. In both embodiments, the crown gear 540, 544 is arranged on the intermediate shaft 122 in a side facing the articulated transmission 400.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedEP 1 943 060 B1

[0002]

Claims

A hand-held power tool (100) comprising a main housing (200) having a longitudinal axis (202), a head housing (300) rotatably engaged with the main housing (200) to locate the head housing (300) at multiple angles with respect to the longitudinal axis (202) of the main housing (200), a drive motor (114) having a drive shaft (116) and located in the main housing (200), a linkage (400) defining an axis of rotation (402) of the head housing (300) with respect to the main housing (200), characterized in that the head housing (300) comprises a rotary impact mechanism (122).Hand-held power tool (100) according to Claim 1, characterized in that the rotary percussion mechanism (122) is connected to the articulated transmission (400).Hand-held power tool (100) according to Claim 1 or 2, characterized in that the rotary percussion mechanism (122) has an intermediate shaft (120) which is designed to engage with the articulated transmission (400).Hand-held power tool (100) according to Claim 3, characterized in that the intermediate shaft (120) has at least one crown wheel (540).Hand-held power tool (100) according to one of the preceding claims, characterized in that the articulated gear mechanism (400) has a servomotor (560) which is designed to move the head housing (300) about the axis of rotation (402) to the main housing (200).Hand-held power tool (100) according to one of the preceding claims, characterized in that the articulated gear mechanism (400) has fixing magnets (420) which are designed to fix the head housing (300) relative to the main housing (200).Hand-held power tool (100) according to one of the preceding claims, characterized in that the articulated gear mechanism (400) has a crown gear mechanism (430) which is designed to connect the rotary percussion mechanism (122) to the drive motor (114) in terms of drive technology.Hand-held power tool (100) according to one of the preceding claims, characterized in that a gear mechanism (118) is arranged in the main housing (300), which gear mechanism is designed to connect the drive motor (114) to the articulated gear mechanism (400) in terms of drive technology.Hand-held power tool (100) according to Claim 8, characterized in that the gear mechanism has a transmission shaft (292) which is designed to engage with the articulated gear mechanism (400).Hand-held power tool (100) according to Claim 9, characterized in that the transmission shaft (292) has at least one crown wheel (294).

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