Hand-held power tool

Abstract

The present invention relates to a handheld power tool (100) having a housing (110), a drive unit (111), an impact mechanism (122) drivable by the drive unit (111), and a tool receiving portion (150) for receiving an insert tool (140), wherein the tool receiving portion (150) is at least partially drivable by means of the impact mechanism (122). The present invention proposes that the handheld power tool (100) has a spacer element (200) configured to space the insert tool (140) from the housing (110).

Description

Technical Field

[0001] This invention relates to a handheld machine tool. Background Technology

[0002] A handheld machine tool having a drive unit, a housing, an impact mechanism and a tool receiving section is known from the prior art. Summary of the Invention

[0003] This invention relates to a handheld power tool having a housing, a drive unit, an impact mechanism drivable by the drive unit, and a tool receiving section for receiving an insert tool, wherein the tool receiving section is at least partially drivable by means of the impact mechanism. The invention proposes that the handheld power tool include a spacer element configured to space the insert tool away from the housing.

[0004] This invention provides a handheld machine tool in which the robustness of the tool receiver is improved. The tool receiver in a handheld machine tool is a common site of defects, especially breakage, under high loads. This can occur, related to the type of insert tool used, where the insert tool slides back and forth during operation of the tool receiver. This results in suboptimal torque transmission in the impact mechanism and uneven load on the tool receiver. This can lead to load spikes, which, over time, can cause defects or breakage of the tool receiver. This invention solves this problem.

[0005] Handheld machine tools can be configured as electrically powered handheld machine tools. Here, electrically powered handheld machine tools can be configured as either grid-connected or battery-powered handheld machine tools. For example, handheld machine tools can be configured as screwdrivers, drilling screwdrivers, rotary impact screwdrivers, hammers, drill hammers, or impact drilling screwdrivers.

[0006] The housing of the handheld machine tool is configured to at least partially receive the drive unit, impact mechanism, and tool receiving section. The housing may be configured as a cover housing with two half-shells.

[0007] The handheld machine tool has a drive unit. The drive unit includes a drive motor and a transmission. The drive motor can be an electronically commutated drive motor. The drive motor can particularly be configured as at least one electric motor. The transmission can be configured as at least one planetary gear transmission, wherein the planetary gear transmission can, for example, be switchable. The drive motor is configured such that it can be operated by a manual switch. If the user operates the manual switch, the drive motor is turned on and the handheld machine tool is put into operation. If the user accordingly stops operating the manual switch, the drive motor is turned off. Preferably, the drive motor can be electronically controlled and / or regulated to enable reverse operation and pre-setting of a desired rotational speed. In reverse operation, the drive motor can switch between clockwise and counterclockwise rotational directions. To switch the drive motor in reverse operation, the handheld machine tool can have a rotational direction switching element, particularly a rotational direction switching switch.

[0008] The handheld machine tool has an impact mechanism. During operation, the impact mechanism generates a high torque peak, thereby loosening or tightening jammed or fastened connections, or performing drilling. The impact mechanism can be connected to a drive motor via a transmission. The impact mechanism can be configured as, for example, a rotary impact mechanism, a locking impact mechanism, a rotating impact mechanism, a V-groove impact mechanism, or a hammering mechanism. The transmission and / or impact mechanism can have an intermediate shaft. For example, the intermediate shaft can receive planetary gears from the transmission. Furthermore, the intermediate shaft can at least partially drive the impact mechanism. The impact mechanism can have an impact mechanism housing and / or an impact mechanism cover. Additionally, the impact mechanism can have at least one impactor or hammer and at least one impact mechanism spring. Here, the impactor and impact mechanism spring can be substantially arranged within the impact mechanism housing. The impactor includes at least one impact protrusion. Exemplarily, two or three impact protrusions can be provided. The impact mechanism spring can be exemplary configured as a helical spring, a barrel spring, a conical spring, a chimney spring, or a non-circular spring.

[0009] The handheld power tool has a tool receiving section. The tool receiving section can be configured as an inner tool receiving section (e.g., a bit receiving section) and / or an outer tool receiving section (e.g., a socket receiving section). The tool receiving section can receive insert tools, such as screwdriver bits, socket wrenches, or insert sockets, allowing the user to establish a threaded connection between the fastening element and the fastening carrier. An impact mechanism is configured to drive an output shaft. The output shaft is configured to drive the tool receiving section. The tool receiving section has at least one anvil protrusion at its end facing the impact mechanism and / or drive unit. Here, the impactor of the impact mechanism is configured to rotate the anvil protrusion in the circumferential direction by means of the impact protrusion and thereby drive the tool receiving section. For example, the tool receiving section may have two or three anvil protrusions.

[0010] Additionally, the handheld machine tool includes a power supply device configured for battery operation and / or grid operation using a battery pack, particularly a handheld machine tool battery pack. In a preferred embodiment, the power supply device is configured for battery operation. Within the scope of this invention, "handheld machine tool battery pack" should be understood as a combination of at least one battery cell and a battery pack housing. The handheld machine tool battery pack is advantageously configured to supply power to commercially available battery-operated handheld machines. At least one battery cell is configured, for example, as a lithium-ion battery cell with a rated voltage of 3.6V. For example, a handheld machine tool battery pack may include up to ten battery cells, although other numbers of battery cells are also contemplated. Embodiments of handheld machines as battery-operated and as grid-operated are well known to those skilled in the art, and therefore details of the power supply device are not discussed here.

[0011] The handheld power tool has at least one control unit for controlling the drive motor. The control unit may be located in the housing, for example, in the handle of the handheld power tool or in the area of ​​the power supply interface.

[0012] The spacer element is configured to space the insert tool from the housing. Here, the spacer element spaces the insert tool such that, when connected to the tool receiver, the insert tool is spaced from the housing and substantially does not contact the housing during operation of the handheld machine tool. The spacer element is exemplarily configured as a spacer retainer. The spacer element can be exemplarily configured as annular, disc-shaped, or plate-shaped.

[0013] In one embodiment of the handheld machine tool, a spacer element can be mounted on the tool receiver. The spacer element can be mounted such that the tool receiver can be used substantially unobstructed when using the spacer element. The spacer element can be connected to the tool receiver, for example, by form-locking and / or force-locking.

[0014] In one embodiment of the handheld machine tool, the spacer element has a receiving portion for a tool receiving portion. The receiving portion for the tool receiving portion may have an inner receiving portion for the tool receiving portion. The inner receiving portion for the tool receiving portion may have a shape corresponding to the tool receiving portion. By arranging the spacer element on the tool receiving portion using the inner receiving portion of the spacer element, optimal torque transmission from the tool receiving portion to the insert tool can be achieved.

[0015] In one embodiment of a handheld machine tool, the tool receiving section has a transition section, wherein a receiving section of a spacer element can be arranged on the transition section. The receiving section of the spacer element is configured such that it receives the transition section. The receiving section of the spacer element and the transition section are constructed corresponding to each other. Here, the inner receiving section of the spacer element is constructed corresponding to the transition section. The tool receiving section additionally has a torque transmission section or a drive section. The torque transmission section is constructed for transmitting torque to an insert tool. The torque transmission section can be polygonal, such as quadrilateral. For example, the torque transmission section can be constructed substantially cubically. Furthermore, the tool receiving section can have an output section. The output section can terminate at an anvil protrusion. The output section can be constructed, for example, cylindrical. The output section is constructed for transmitting the rotational motion received by the anvil protrusion to the transition section. The transition section can be arranged between the torque transmission section and the output section.

[0016] In one embodiment of the handheld machine tool, the transition section has a radius ranging from 3 mm to 8 mm. This radius is optimized to improve the stability and robustness of the transition section. Preferably, the radius is formed in the range of 5 mm to 7 mm.

[0017] In one embodiment of the handheld machine tool, the receiving portion of the spacer element has a polygonal section. The polygonal section of the receiving portion of the spacer element is polygonal, such that it is constructed corresponding to the torque transmission section. Here, the polygonal section enables the spacer element to at least form-fit against the tool receiving portion, and particularly at least partially against the torque transmission section. The polygonal section can be constructed, for example, in the form of a cube, hollow cube, cuboid, or hollow cuboid. The polygonal section can be oriented towards the tool receiving portion or towards the insert tool.

[0018] In one embodiment of the handheld machine tool, the receiving portion of the spacer element has a cylindrical section. The cylindrical section of the receiving portion of the spacer element is configured such that it corresponds to the output section. The cylindrical section enables the spacer element to at least form-fit against the tool receiving portion. The cylindrical section can be configured toward the drive unit.

[0019] In one embodiment of the handheld machine tool, the spacer element has an abutment element configured to receive an insertable tool. The abutment element can be configured, for example, as an abutment surface of the spacer element. When the insertable tool is connected to the tool receiver, the abutment element can be arranged in a direction away from the drive unit. The abutment element can be connected to the spacer element. Alternatively, the abutment element and the spacer element can be integral. Both the spacer element and the abutment element can be made of an elastic material. Both the abutment element and the spacer element can be used to dampen vibrations during operation of the handheld machine tool. The abutment element can be exemplary configured as a disc or annular shape.

[0020] In one embodiment of the handheld machine tool, the spacer element can be arranged spaced apart from the housing and / or the impact mechanism housing on the tool receiving section. The spacer element can be arranged spaced apart on the tool receiving section such that, during operation of the handheld machine tool, especially the tool receiving section, the spacer element does not contact the housing and / or the impact mechanism housing.

[0021] The invention is also based on a spacer element used in the handheld machine tool described above. Attached Figure Description

[0022] The present invention will now be described with reference to preferred embodiments. These are illustrated in the following figures: Figure 1 : A schematic diagram of a handheld machine tool according to the present invention; Figure 2a Side view of a handheld machine tool with spacer elements; Figure 2b Side view of a handheld machine tool with connected spacer elements; Figure 3 A partial longitudinal section of the tool receiving section of a handheld machine tool with connected spacer elements. Detailed Implementation

[0023] Figure 1 A handheld power tool 100 according to the present invention is shown, configured as an exemplary battery-powered rotary impact screwdriver 100. The handheld power tool 100 includes a tool receiving section 150. The handheld power tool 100 has a housing 110 with a handle 126. The handheld power tool 100 is configured as a battery-powered handheld power tool 100 so that it can be mechanically and electrically connected to a power supply device for battery operation without relying on grid power. A battery pack 130 is used here as the power supply device. However, the present invention is not limited to battery-powered handheld power tools, but can also be applied to grid-dependent, i.e., grid-operated handheld power tools.

[0024] The housing 110 includes a drive unit 111. The drive unit 111 is disposed within the housing 110. The drive unit 111 includes an electrically commutated drive motor 114 and a transmission 118, the drive motor being powered by a handheld machine tool battery pack 130. The transmission 118 is configured as at least one planetary gear transmission. The drive motor 114 is configured such that it can be operated, for example, by a manual switch 128, enabling the drive motor 114 to be turned on and off. Advantageously, the drive motor 114 can be electronically controlled and / or regulated, enabling reverse operation and a desired rotational speed. For reverse operation, the handheld machine tool 100 has a rotation direction switching element 121, configured as a rotation direction switching switch. The rotation direction switching element 121 is configured to switch the drive motor 114 between clockwise and counterclockwise rotation directions. The structure and operation of suitable drive motors are well known to those skilled in the art and therefore will not be discussed in detail here.

[0025] The housing 110 at least partially receives the drive motor 114, the transmission device 118, and the tool receiving part 150. Here, the housing 110 is formed as a cover housing having two half-shells 112.

[0026] A handheld power tool 100 configured as a battery-powered rotary impact screwdriver includes an impact mechanism 122, particularly a rotary impact mechanism 122, which has an intermediate shaft 120. Both the rotary impact mechanism 122 and the intermediate shaft 120 are arranged within a housing 110. The rotary impact mechanism 122 includes an impact mechanism housing 123, although it can also be arranged in other suitable housings, such as a transmission housing 119. The rotary impact mechanism 122 includes an impactor and an impact mechanism spring, which are not shown in detail. The impactor and impact mechanism spring are substantially arranged within the impact mechanism housing 123. The impactor has two impact protrusions, not shown in detail. The rotary impact mechanism 122 is configured to drive an output shaft 124. The handheld power tool 100 includes a tool axis 102, where the axis of rotation of the output shaft 124 constitutes the tool axis 102. The output shaft 124 is configured to drive a tool receiver 150. The tool receiver 150 is provided on the output shaft 124. Preferably, the tool receiving portion 150 is formed and / or constructed on the output shaft 124. Preferably, the tool receiving portion 150 is arranged in an axial direction 132 away from the direction pointed to by the drive unit 111. The tool receiving portion 150 or the output shaft 124 includes two anvil protrusions 164 at the end toward the rotary impact mechanism 122 and / or the drive unit 111, see also Figure 3The impactor of the rotary impact mechanism 122 is configured to rotate the anvil protrusion in the circumferential direction by means of the impact protrusion and thereby drive the tool receiver 150 or the output shaft 124. The tool receiver 150 is here formed as an outer tool receiver 152, such as a socket receiver. The tool receiver 150 is configured to receive an insert tool 140, such as a socket wrench or a plug socket.

[0027] The handheld power tool 100 has at least a control unit 170 for controlling the drive unit 111, particularly the drive motor 114. The housing 110 at least partially receives the control unit 170.

[0028] Furthermore, the housing 110 includes a power retention device 160. The power retention device 160 receives the handheld machine tool battery pack 130 and forms a support leg 162 thereon with a standing surface. The handheld machine tool battery pack 130 can be released from the power retention device 160 without tools. Additionally, the housing 110 has a handle 126 and the power retention device 160. The handle 126 can be gripped by a user. In one embodiment, the power retention device 160 is arranged on the handle 126. The handheld machine tool 100 can be placed on the support leg 162.

[0029] Figure 2 shows a side view 300 of the handheld power tool 100. Here, Figure 2a A side view 300 showing a spacer element 200 is shown. Figure 2b A side view 300 of a handheld power tool 100 with a connected spacer element 200 is shown. The handheld power tool 100 includes the spacer element 200. The spacer element is configured to space an insert tool 140 from a housing. The spacer element 200 spaces the insert tool 140 such that the insert tool 140, when connected to a tool receiver 150, is spaced from the housing 110 and does not substantially contact the housing, at least during operation of the handheld power tool 100. Exemplarily, the spacer element 200 is here formed as an annular spacer retainer. The spacer element 200 can be mounted on the tool receiver 150. Here, the spacer element 200 can be connected to the tool receiver 150 at least in a form-locking manner. The spacer element 200 includes a receiving portion 210 for the tool receiver 150, wherein the receiving portion 210 is configured as an inner receiving portion 212 for the tool receiver 150. Here, the inner receiving portion 212 for the tool receiver 150 includes a shape corresponding to the tool receiver 150.

[0030] The tool receiving section 150 includes a transition section 230. A receiving section 210 of the spacer element 200 can be arranged on the transition section 230, wherein the receiving section 210 of the spacer element 200 is shaped such that it receives the transition section 230. Furthermore, the receiving section 210 of the spacer element 200 and the transition section 230 are shaped correspondingly to each other. The tool receiving section 150 includes a torque transmission section 240, or drive section. The torque transmission section 240 is configured to transmit torque to the insert tool 150. Here, the torque transmission section is shaped as a polygon, such as a quadrilateral, and substantially as a cube. The tool receiving section 150 includes an output section 250. The output section 250 terminates in the anvil protrusion 164, see also... Figure 3 Here, the output section 250 is, for example, shaped as a cylinder. A transition section 230 is arranged between the torque transmission section 240 and the output section 250. The transition section 240 includes a radius 232 ranging from 3 mm to 8 mm.

[0031] Spacer element 200 includes abutment element 220. Abutment element 220 is configured to receive insert tool 150 such that insert tool 150 abuts against abutment element 220 during operation of handheld power tool 100. Here, abutment element 220 is exemplarily formed as abutment surface 222. When insert tool 140 is connected to tool receiving portion 150, abutment element 220 is arranged in a direction away from drive unit 111. Spacer element 200 forms abutment element 220 here, such that they are integral. Here, spacer element 200 and abutment element 220 are made of elastic material. Abutment element 220 is formed, for example, disc-shaped. Spacer element 200 can be arranged spaced apart from housing 110 and / or impact mechanism housing 123 on tool receiving portion 150.

[0032] Figure 3A partial longitudinal section 310 of a handheld power tool 100 having a connected spacer element 200 is shown. The receiving portion 210 of the spacer element 200 includes a polygonal segment 214. Here, the polygonal segment 214 of the receiving portion 210 of the spacer element 200 is polygonal, such that it is shaped to correspond to the torque transmission segment 240. The polygonal segment 214 can at least partially abut against the torque transmission segment 240 in a form-locking manner in the connected state. Exemplarily, the polygonal segment 214 is shaped as a hollow cube and is shaped in a direction toward the tool receiving portion 150 or toward the insert tool 140. The receiving portion 210 of the spacer element 200 includes a cylindrical segment 216. The cylindrical segment 216 of the receiving portion 210 of the spacer element 200 is shaped such that it is shaped to correspond to the output segment 250. Here, the cylindrical section 214 enables the spacer element 200 to abut against the output section 250 of the tool receiving section 150 at least in a form-locking manner. Here, the cylindrical section 216 is formed in the direction toward the drive unit 111.

Claims

1. A handheld power tool (100) comprising a housing (110), a drive unit (111), an impact mechanism (122) drivable by said drive unit (111), and a tool receiving section (150) for receiving an insert tool (140), wherein, The tool receiving unit (150) can be driven at least partially by means of the impact mechanism (122). The feature is that it has a spacer element (200) configured to space the insert tool (140) from the housing (110).

2. The handheld machine tool (100) according to claim 1, characterized in that, The spacer element (200) can be mounted on the tool receiving part (150).

3. The handheld machine tool (100) according to claim 1 or 2, characterized in that, The spacer element (200) has a receiving section (210) for the tool receiving section (150).

4. The handheld machine tool (100) according to claim 3, characterized in that, The tool receiving section (150) has a transition section (230), wherein the receiving section (210) of the spacer element (200) can be arranged on the transition section (230).

5. The handheld machine tool (100) according to claim 4, characterized in that, The transition section (230) has a radius (232) in the range of 3 mm to 8 mm.

6. The handheld machine tool (100) according to any one of claims 2 to 5, characterized in that, The receiving part (210) of the spacer element (200) has a polygonal section (214).

7. The handheld machine tool (100) according to any one of claims 2 to 6, characterized in that, The receiving portion (210) of the spacer element (200) has a cylindrical section (216).

8. The handheld machine tool (100) according to any one of the preceding claims, characterized in that, The spacer element (200) has a contact element (220) configured to receive the insertable tool (140).

9. The handheld machine tool (100) according to any one of the preceding claims, characterized in that, The spacer element (200) can be arranged on the tool receiving part (150) at a distance from the housing (110) and / or the impact mechanism housing (123).

10. A spacer element (200) for use in a handheld machine tool (100) according to any one of claims 1 to 9.

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