CN108972458B - Hand-held power tool - Google Patents
Hand-held power tool Download PDFInfo
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- CN108972458B CN108972458B CN201810538834.6A CN201810538834A CN108972458B CN 108972458 B CN108972458 B CN 108972458B CN 201810538834 A CN201810538834 A CN 201810538834A CN 108972458 B CN108972458 B CN 108972458B
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- securing
- securing element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Portable Power Tools In General (AREA)
- Gear Transmission (AREA)
Abstract
The invention relates to a hand-held power tool (100) having a gear (170) and a gear housing (110), having a drive shaft (119), wherein the drive shaft (119) is designed as a drive spindle (120) and the drive spindle (120) comprises at least one spindle bearing (234). It is proposed that the drive spindle (120) comprises at least one securing unit (300, 301, 302) having at least one first securing element (310,315,316), wherein the at least one securing unit (300, 301, 302) is designed for axially securing the drive spindle (120) and for forming an operative connection (400) with the transmission housing (110).
Description
Technical Field
The invention relates to a hand-held power tool having a safety unit.
Background
DE 10 2012 219 A1 discloses a hand-held power tool having a transmission and a transmission housing, which has a drive shaft, wherein the drive shaft is designed as a drive spindle and the drive spindle comprises at least one spindle bearing.
Disclosure of Invention
The invention is based on a hand-held power tool having a gear and a gear housing, which has a drive shaft, wherein the drive shaft is designed as a drive spindle and the drive spindle comprises at least one spindle bearing. It is proposed that the drive spindle comprises at least one securing unit having at least one first securing element, wherein the at least one securing unit is designed to axially secure the drive spindle and is operatively connected to the transmission housing. The functional connection between the safety unit and the transmission housing is to be understood as a connection via which the safety unit is connected to the transmission housing. In this case, the functional connection can be designed releasably or non-releasably. The operative connection can be established by force locking, form locking and/or material locking. Examples of operative connection structures for the safety unit and the transmission housing are a threaded connection, a clamping connection, a toothed connection, an adhesive connection and/or other connection types well known to those skilled in the art.
Within the scope of the present invention, "axial" means at least substantially parallel to at least one tool axis. The at least one tool axis is formed here by at least one axis of rotation of the tool receiver.
Within the scope of the invention, a spindle bearing is understood to be, for example, a rolling bearing, a plain bearing or other bearing types known to the person skilled in the art. The structure and operation of spindle bearings are known to those skilled in the art.
The invention makes it possible to increase the safety of the user when using the hand-held power tool. A disadvantage of the prior art is that the drive spindle can be released from the hand-held power tool in the event of a failure of the at least one spindle bearing. Loosening of the drive spindle in the event of a spindle bearing failure is an undesirable effect, in particular during operation of the hand-held power tool. The invention solves this problem and increases the robustness of the hand-held power tool.
According to a first embodiment, the at least one safety unit comprises a second safety element. The second securing element is designed as at least one component of the spindle bearing, in particular as an inner ring. The first securing element is provided for axially securing the drive spindle via the at least one component, in particular the inner ring, of the spindle bearing. In this case, the first securing element is configured to engage with the second securing element. Within the scope of the present invention, "fitting" means that the two components are coordinated with one another so that they can interact.
In a first embodiment, the first securing element is shaped in such a way that it counteracts an undesired axial movement of the drive spindle, in particular a parallel displacement of the drive spindle in the direction of the tool receiver, via the second securing element. The drive spindle is thus not able to be released from the transmission housing. The robustness of the hand-held power tool can thus be increased by means of a cost-effective solution.
The at least one component of the spindle bearing can additionally or alternatively also be an outer ring, at least one rolling element, for example at least one ball, at least one rolling cone, at least one needle or other rolling elements known to the person skilled in the art, or at least one rolling bearing cage, at least one sealing disk, at least one rolling bearing guide or at least one sliding bearing bush. Other components of the spindle bearing are well known to those skilled in the art.
In an advantageous embodiment, the drive spindle has an axial securing element in the form of an axial shoulder. The axial shoulder is provided for axially securing the spindle bearing. In addition to the axial shoulder, the drive spindle can also have at least one support flange. The axial shoulder is disposed adjacent to the at least one support flange.
The axial shoulder protects the main shaft bearing against parallel movement of the main shaft bearing via the at least one member of the main shaft bearing. Thereby ensuring greater safety for the user.
Particularly preferably, the first securing element is disk-shaped. Within the scope of the present invention, "disc-shaped" means that the first safety element is of substantially planar design and has at least one substantially planar surface. It is also conceivable for the first securing element to form a plurality of depressions, notches, openings and/or steps. A cost-effective and robust first safety element can be provided by the disc-shaped first safety element.
In a second embodiment, the at least one safety unit comprises a second safety element. The second securing element is designed as an at least substantially circumferential flange on the drive spindle. The first securing element is provided here for at least partially covering the at least substantially circumferential flange and axially securing the drive spindle. In the second embodiment, the drive spindle may also have a support flange. The at least substantially circumferential flange is arranged at an end region of the support flange. The first securing element is designed in such a way that it can at least partially cover the at least substantially circumferential collar, so that the drive spindle is secured against parallel displacement. This ensures a robust and reliable safety of the drive spindle.
Preferably, the first safety element is substantially pot-shaped. Furthermore, the first securing element is provided for at least partially enclosing the at least substantially circumferential flange. In the context of the present invention, "pot-shaped" means that the first safety element is shaped in the manner of a pot, wherein the manner of a pot may have at least one notch and/or opening. Thus ensuring a safe and robust fixation of the drive spindle against parallel movements.
In a third embodiment, a second securing element, which is configured as at least one component of the spindle bearing, in particular as an inner ring, forms a first securing unit together with the first securing element; the first securing element is designed to axially secure the drive spindle via a second securing element. In addition, a further second securing element forms a second securing unit with the further first securing element, the further second securing element being an at least substantially circumferential collar; the further first securing element is designed to at least partially cover the at least substantially circumferential flange and axially secure the drive spindle. The first and second securing units are provided for axially securing the drive spindle.
In this case, the first securing element of the first securing unit and the first securing element of the second securing unit again form a functional connection to the transmission housing. The first safety element and the second first safety element are again connected to the transmission housing in a force-fitting, form-fitting and/or material-fitting manner. The drive spindle comprises a second securing element of the first securing unit and a second securing element of the second securing unit. The drive spindle may also comprise at least one support flange, wherein the second securing element is formed on an end region of the at least one support flange.
The first and second safety units protect the drive spindle against undesired parallel movements. Thereby providing increased and less costly safety for the user.
Preferably, the first safety element and the second first safety element are constructed in one piece. By means of the integrated construction of the first and second first fuse elements, a robust, reliable and cost-effective fuse element is provided.
Advantageously, the first securing element has a notch. The first securing element can be connected to the transmission housing by means of the notches, in particular screwed to the transmission housing. The first securing element can be connected to the transmission housing by means of a connecting element via a slot. The connecting element is here a pin, screw, rivet or other connecting element well known to the person skilled in the art. Particularly preferably, the first securing element can be screwed to the transmission housing by means of screws. Other types of connections known to those skilled in the art for the connection of the first safety element to the transmission housing are also conceivable. For this purpose, the gear housing has corresponding notches for receiving the connecting elements. A reliable connection between the first safety element and the transmission housing is thus ensured.
Drawings
The invention is explained below on the basis of preferred embodiments. The figures that follow show:
fig. 1 is a schematic view of a hand-held power tool according to the invention with a safety unit;
fig. 2 shows a first embodiment of the hand-held power tool according to the invention in an enlarged sectional view;
fig. 3 is a perspective view of a hand-held power tool according to the invention, which has a first safety element connected to a gear housing;
FIG. 4 is a perspective view of the drive spindle of the first embodiment with an axial shoulder and a first safety element in the form of a disk;
fig. 5 shows a second embodiment of the hand-held power tool according to the invention in an enlarged sectional view;
fig. 6 shows a third embodiment of the hand-held power tool according to the invention in an enlarged sectional view.
Detailed Description
Fig. 1 shows an exemplary hand-held power tool 100 with a power-tool housing 105 and a handle 115. According to one specific embodiment, the hand-held power tool 100 can be mechanically and electrically connected to the battery pack 190 for a network-independent current supply. Fig. 1 shows a hand-held power tool 100 as an exemplary rechargeable battery drill driver. It should be noted, however, that the invention can be used in different hand-held power tools, so that the invention is not limited to battery-operated screwdriver machines, which have a drive spindle 120 as the drive shaft 119 and a transmission housing 110, and furthermore, that the invention is independent of whether the hand-held power tool 100 is electrically operable, i.e., is operated independently of the mains by means of the battery pack 190 or is operated independently of the mains, and/or is operable without electricity.
The machine tool housing 105 encloses, for example, an electric drive motor 180 and a transmission 170. Electric drive motor 180 is supplied with current from a battery pack 190. The transmission 170 connects the drive shaft 119, in particular the drive spindle 120, to the drive motor 180. The drive motor 180 is provided with a motor housing 185 and the gear 170 with the gear housing 110, for example. The transmission housing 110 and the motor housing 185 are arranged, for example, in the machine tool housing 105.
The transmission 170 is configured to transmit torque generated by the drive motor 180 to the drive spindle 120. According to one specific embodiment, the gear mechanism 170 comprises a planetary gear mechanism, which is designed with different gears or planetary stages and is driven in rotation by the drive motor 180 when the hand-held power tool 100 is in operation. Furthermore, the transmission 170 has a torque clutch 160.
The planetary gear set 170 with the torque clutch 160 is described in an exemplary manner in DE 10 2012 219 495A1. Reference is made herein to this document and its teachings in detail, and therefore a detailed discussion of the planetary transmission 170 having the torque clutch 160 is omitted.
The manual switch 195 operates the driving motor 180, whereby the driving motor 180 can be turned on and off. The drive motor 180 may be provided as any motor type, such as an electronically commutated motor or a dc motor. Preferably, the drive motor 180 is configured to be electronically controllable or adjustable in such a way that a reverse operation is possible and a desired rotational speed can be set. The working and construction of suitable drive means are sufficiently known to the person skilled in the art and are therefore not discussed here in detail.
The bearing assembly 130 rotatably supports the drive spindle 120 in the tool housing 105. In an embodiment, the drive spindle is provided with a tool receiver 140. The tool receiver 140 is arranged in the region of the end face 112 of the tool housing 105 and has, for example, a drill chuck 145. According to one embodiment, the bearing assembly 130 has at least two bearing locations 132,134. The at least two bearing points 132,134 are arranged in a region 299 behind the transmission 170 and are enclosed by the power-tool housing 105, see fig. 2. The at least two bearing points 132,134 are provided with at least two bearings: at least one stationary bearing 232 and at least one main shaft bearing 234, see fig. 2. The at least one stationary bearing 232 and the at least one spindle bearing 234 are provided for rotatably supporting the drive spindle 120.
The tool 150 may be received through the tool receiver 140. The tool receiver 140 may be molded onto the drive spindle 120 or may be connected thereto in a slip-on fashion. Fig. 1 shows, for example, a tool receiver 140, which is connected to the drive spindle 120 in the form of a kit by means of a fastening device 122 provided. Further, the axis of rotation of the tool receiver 140 constitutes at least one tool axis 280. The tool receiver 140 with the tool 150 is arranged in the front end region 290 of the hand-held power tool 100.
According to one specific embodiment, the hand-held power tool 100 has a torque clutch 160 as described above. The torque clutch 160 is provided with a torque adjusting device 168, for example. The torque adjustment device 168 is equipped with a torque adjustment sleeve 165 that can be actuated by a user of the hand-held power tool 100. The torque adjustment sleeve 165 serves to adjust the torque limit desired by the user via the torque clutch 160. The working and construction of the torque adjustment sleeve 165 and the torque adjustment device 168 are well known to the person skilled in the art and refer in detail to DE 10 2012 219 495A1.
The drive spindle 120 is equipped with a spindle locking device 250, for example. According to an embodiment, the spindle locking device 250 is arranged between the at least two bearing locations 132,134 and the transmission 170 in the axial direction of the drive spindle 120. The spindle locking device 250 is used to center the drive spindle 120 when the drive motor 180 is off. The manner of operation and construction of the spindle locking device 250 is well known to those skilled in the art.
Fig. 2 shows a first embodiment of a hand-held power tool 100 according to the invention in an enlarged sectional view 200. In this first embodiment, the drive spindle 120 has a securing unit 300 in the form of a first securing unit 301 with first securing elements 310,315. The first securing element 315 is disk-shaped in the first embodiment and comprises at least one substantially central opening 500 and a slot 510, see fig. 4. Furthermore, the first relief element 315 has a first and a second side 311,312 which are substantially flat.
The first securing unit 301 forms a functional connection 400 with the transmission housing 110 and axially secures the drive spindle 120. The first securing unit 301 prevents an undesired parallel displacement of the drive spindle 120 along the machine tool axis 280 in the direction of the front end region 290 of the hand-held power tool 100. The active connection 400 is formed in this embodiment by a force-fitting connection, in particular by a threaded connection 410 by means of a screw 411, see also fig. 3. To establish the functional connection 400, in particular the screw connection 410, the transmission housing 110 has a slot 111. The slot 111 receives a screw 411.
The spindle bearing 234 is a rolling bearing, in particular a ball bearing, in the first embodiment. The main shaft bearing 234 includes an inner ring 236, an outer ring 238, rolling bodies 240, and a sealing disk 242. The fixed bearing 232 is configured in this embodiment as a sliding bearing.
The first fuse unit 301 comprises second fuse elements 320,321. The second securing element 321 is in this embodiment an inner ring 236 of the spindle bearing 234. The first securing element 315 is adapted to the second securing element 321, i.e. the inner ring 236 of the spindle bearing 234, in such a way that the first securing element 315 prevents an undesired parallel displacement of the drive spindle 120 in the direction of the front end region 290 of the hand-held power tool 100 via the second securing element 321.
The drive spindle 120 has an axial securing element 330 in the form of an axial shoulder 331, see also fig. 4 for this purpose. The axial shoulder 331 is designed to secure the spindle bearing 234 against undesired parallel movements in the direction of the front end region 290 of the hand-held power tool 100. Additionally, the drive spindle 120 also has a support flange 340. An axial shoulder 331 is disposed between the support flange 340 and the inner ring 236 of the main shaft bearing 234.
Fig. 3 shows a perspective view of the hand-held power tool 100 according to the invention, wherein the first securing element 315 is connected to the transmission housing 110. The first safety unit 301, in particular the functional connection 400 between the first safety element 315 and the transmission housing 110, is in the first embodiment designed as a screw connection 410. The threaded connection 410 is established by the screw 411, the notch 510 of the first safety element 315 and the notch 111 of the transmission housing 110.
Fig. 4a shows a perspective view of drive spindle 120 with axial securing element 330, in particular axial shoulder 331. Fig. 4b shows a first safety element 315 in a first embodiment. The first securing element 315 is substantially disk-shaped and shows a substantially planar first surface 311. The drive spindle 120 passes substantially through the substantially central opening 500. The slot 510 is for receiving a screw 411 to establish a threaded connection 410 with the slot 111 of the transmission housing 110.
Fig. 5 shows a second exemplary embodiment of a hand-held power tool 100 according to the invention in an enlarged sectional view 200. The second embodiment comprises an alternative safety unit 300,302 with a second safety element 320, 322. The second securing element 322 is formed as an at least substantially circumferential collar 550 on the drive spindle 120. Furthermore, the second safety unit 302 comprises first safety elements 310,316. The first fuse element 316 is configured for at least partially enclosing an at least substantially circumferential flange 550. In the second embodiment, the drive spindle 120 likewise has a support flange 340. An at least substantially circumferential collar 550 is formed on the end region 551 of the support flange 340. First fuse element 302 is shaped to at least partially envelope at least substantially surrounding flange 550. The drive spindle 120 is thus secured against undesired parallel displacement in the direction of the front end region 290 of the hand-held power tool 100.
In the second embodiment, the first safety element 316 is substantially pot-shaped and has a substantially central notch 560. The drive spindle 120 is guided through a substantially central slot 560. The first securing element 316 is formed with a first radial extension 570, an axial extension 571 and a second radial extension 572 in order to form a pot-like shape. Thus, the first fuse element 316 may at least partially envelop the at least substantially circumferential flange 550.
In addition, the first security element 316 has first and second faces 371,372 that are substantially planar. It is contemplated that in an alternative embodiment, the substantially planar first and second faces 371,372 may also include embossments, additional openings, additional notches, or the like.
As already explained above in the first exemplary embodiment, in the second exemplary embodiment there is also an operative connection 400 between the safety units 300,302 and the transmission housing 110. In this case, the second securing unit 302 forms a functional connection 400 to the transmission housing 110 by means of a screw connection 410.
Fig. 6 shows a third embodiment of a hand-held power tool 100 according to the invention in an enlarged sectional view. The third embodiment includes a first fuse unit 301 and a second fuse unit 302. The first and second securing units 301,302 are provided for securing the drive spindle 120 against undesired parallel displacement in the direction of the front end region 290 of the hand-held power tool 100. As explained above, the first and second securing units 301,302 form a functional connection 400 with the transmission housing 110 in the form of a threaded connection 410.
The first safety unit 301 comprises a first safety element 315 and a first second safety element 321 and is implemented just like the safety units 300,301 according to fig. 2. The second safety unit 302 comprises a second first safety element 316 and a second safety element 322 and is implemented as the safety units 300,302 according to fig. 5.
The first and second securing elements 321, as explained above, are configured as inner rings 236 of the spindle bearing 234 and the second securing element 322 is configured as an at least substantially circumferential collar 550. Here, the at least substantially circumferential flange 550 is also arranged on the end region 551 of the support flange. Additionally, drive spindle 120 includes an axial securing element 330 in the form of an axial shoulder 331.
In the third embodiment, the first safety element 315 and the second first safety element 316 are formed in two parts. In an alternative embodiment, it is also conceivable for the first safety element 315 and the second first safety element 316 to be formed in one piece.
In the third embodiment, the substantially planar first face 311 of the first security element 315 faces the substantially planar second face 372 of the second first security element 316. Conversely, the substantially planar second face 312 of the first fuse element 315 faces away from the substantially planar first face 371 of the second first fuse element 316. In an alternative embodiment, other arrangements of first safety element 315 and second first safety element 316 are conceivable, so that alternative arrangements of the substantially planar surfaces exist.
Claims (7)
1. A hand-held power tool (100) having a transmission (170) and a transmission housing (110) and having a drive shaft (119), wherein the drive shaft (119) is designed as a drive spindle (120) and the drive spindle (120) comprises at least one spindle bearing (234), wherein the drive spindle (120) comprises at least one securing unit having at least one first securing element, wherein the at least one securing unit is designed for axially securing the drive spindle (120) and for forming an operative connection (400) with the transmission housing (110), characterized in that the hand-held power tool comprises at least one of the following features:
the at least one securing unit comprises a first securing unit comprising a first securing element and a second securing element, wherein the second securing element of the first securing unit is configured as an inner ring (236) of the spindle bearing (234), and the first securing element of the first securing unit is provided for axially securing the drive spindle (120) via the inner ring (236) of the spindle bearing (234);
the at least one securing unit comprises a second securing unit, which comprises a first securing element and a second securing element, the second securing element (320, 322) of which is designed as a circumferential collar (550) on the drive spindle (120) and the first securing element of which is provided for at least partially covering the collar (550) and acting on an end face of the collar facing the tool receiver of the drive spindle, in order to axially secure the drive spindle (120).
2. The hand-held power tool (100) according to claim 1, wherein the drive spindle (120) has an axial securing element (330) in the form of an axial shoulder (331), wherein the axial shoulder (331) is provided for axially securing the spindle bearing (234).
3. The hand-held power tool (100) according to claim 1 or 2, wherein the first safety element of the first safety unit is disk-shaped.
4. The hand-held power tool (100) according to claim 1, wherein the first securing element of the second securing unit is pot-shaped and is provided for at least partially covering the flange (550).
5. The hand-held power tool (100) according to claim 1 or 2, wherein the first securing element of the first securing unit and the first securing element of the second securing unit are integrally formed.
6. The hand-held power tool (100) according to claim 1 or 2, characterized in that the first securing element of the first securing unit and/or the first securing element of the second securing unit has a slot (510), wherein the first securing element of the first securing unit and/or the first securing element of the second securing unit can be connected to the transmission housing (110) by means of the slot (510).
7. The hand-held power tool (100) according to claim 6, characterized in that the first securing element of the first securing unit and/or the first securing element of the second securing unit can be screwed to the gear housing by means of the slot.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017209013.8A DE102017209013A1 (en) | 2017-05-30 | 2017-05-30 | Hand tool with a security unit |
| DE102017209013.8 | 2017-05-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108972458A CN108972458A (en) | 2018-12-11 |
| CN108972458B true CN108972458B (en) | 2023-03-14 |
Family
ID=64278753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810538834.6A Active CN108972458B (en) | 2017-05-30 | 2018-05-30 | Hand-held power tool |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108972458B (en) |
| DE (1) | DE102017209013A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018118196A1 (en) * | 2018-07-27 | 2020-01-30 | Festool Gmbh | Hand machine tools, in particular impact wrenches |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107424A (en) * | 2009-12-18 | 2011-06-29 | 罗伯特.博世有限公司 | Hand-guided power tool having a torque coupling |
| CN202239771U (en) * | 2011-10-18 | 2012-05-30 | 东莞市妙达电动工具制造有限公司 | Novel multifunctional electric impact drill |
| CN205497396U (en) * | 2015-02-19 | 2016-08-24 | 株式会社牧田 | Electric tool |
| WO2017064225A1 (en) * | 2015-10-15 | 2017-04-20 | Robert Bosch Gmbh | Hand-held power tool |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012219495A1 (en) * | 2012-10-25 | 2014-04-30 | Robert Bosch Gmbh | Hand tool with a torque coupling |
-
2017
- 2017-05-30 DE DE102017209013.8A patent/DE102017209013A1/en active Pending
-
2018
- 2018-05-30 CN CN201810538834.6A patent/CN108972458B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107424A (en) * | 2009-12-18 | 2011-06-29 | 罗伯特.博世有限公司 | Hand-guided power tool having a torque coupling |
| CN202239771U (en) * | 2011-10-18 | 2012-05-30 | 东莞市妙达电动工具制造有限公司 | Novel multifunctional electric impact drill |
| CN205497396U (en) * | 2015-02-19 | 2016-08-24 | 株式会社牧田 | Electric tool |
| WO2017064225A1 (en) * | 2015-10-15 | 2017-04-20 | Robert Bosch Gmbh | Hand-held power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017209013A1 (en) | 2018-12-06 |
| CN108972458A (en) | 2018-12-11 |
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