CN112936191A - Hand-held power tool - Google Patents
Hand-held power tool Download PDFInfo
- Publication number
- CN112936191A CN112936191A CN201911257473.9A CN201911257473A CN112936191A CN 112936191 A CN112936191 A CN 112936191A CN 201911257473 A CN201911257473 A CN 201911257473A CN 112936191 A CN112936191 A CN 112936191A
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- switching position
- elastic
- operating
- piece
- power tool
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- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000009471 action Effects 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Classifications
-
- 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
Abstract
The invention discloses a hand-held power tool, comprising: the gear shifting mechanism comprises a housing, a motor, an operating member, an output shaft and a transmission mechanism with a gear shifting ring gear, wherein the gear shifting ring gear can move between a first switching position and a second switching position. The electric drill also comprises an elastic piece and a stop piece arranged on the shell, and the stop piece can be abutted against the elastic piece to prevent the elastic piece from driving the speed-changing gear ring to move between the first switching position and the second switching position; when the external force applied to the elastic part by an operator through the operating part is greater than the elastic force of the elastic part, the elastic part can elastically deform to overcome the stopping action of the stopping part on the elastic part so as to drive the speed change gear ring to move from one of the first switching position and the second switching position to the other of the first switching position and the second switching position; when the external force applied to the elastic member is smaller than the elastic force of the elastic member, the elastic member abuts against the stop member to prevent the gear ring from being switched from one of the first and second switching positions to the other. The elastic piece is abutted against the stop piece, so that the mechanism of the whole machine is simpler.
Description
Technical Field
The invention relates to the technical field of electric tools, in particular to a handheld power tool.
Background
In the related art, a handheld power tool (e.g., an electric drill) generally has at least two gears, and when the two gears are switched, a shift wire needs to be pushed by a push button to realize the switching of the gears.
Furthermore, the gear shifting wire needs to be kept still at a certain gear, so that the hand-held power tool can continuously and stably work at the gear. However, the conventional hand-held power tool needs to be provided with a backstop elastic member so that the shift wire can be kept still in a certain gear. This results in a relatively complex construction of the gear shift assembly, a high number of parts, difficulties in safety and high costs.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to provide a hand-held power tool of simple construction.
A hand-held power tool comprising: a motor for outputting rotational power; a housing accommodating the motor; an operating member operatively movably disposed relative to the housing; an output shaft for coupling to a tool bit; a transmission mechanism including a speed change ring gear movable between a first switching position and a second switching position to enable the transmission mechanism to transmit the rotation speed of the motor to the output shaft at different gear ratios; the elastic piece is in transmission connection between the operating piece and the speed change gear ring; the hand-held power tool further comprises a stop piece arranged on the shell, and the stop piece can be abutted against the elastic piece to prevent the elastic piece from driving the speed change gear ring to be freely switched between a first switching position and a second switching position; when the external force applied to the elastic piece by an operator through the operating piece is greater than the elastic force of the elastic piece, the elastic piece can elastically deform to overcome the stopping action of the stop piece on the elastic piece, so that the gear shifting ring can be driven to move from one of the first switching position and the second switching position to the other of the first switching position and the second switching position; when the external force applied to the elastic element is smaller than the elastic force of the elastic element, the elastic element is abutted against the stop element to prevent the gear ring from being switched from one of the first switching position and the second switching position to the other of the first switching position and the second switching position.
Preferably, the elastic member includes a steel wire, the steel wire includes a free end for being coupled with the speed change ring gear, and both free ends of the steel wire are disposed on both sides of the axis of the output shaft.
Preferably, the elastic member drives the change gear ring to move between the first switching position and the second switching position along the axial direction of the output shaft under the action of the operating member.
Preferably, the housing includes a gear housing covering an outer periphery of the transmission mechanism and a main body portion covering at least a part of the motor and the gear housing.
Preferably, the main body portion is provided with a slot, and one of the main body portion and the operating member is provided with a guide rail, and the other of the main body portion and the operating member is provided with a guide groove, so that the operating member is slidably disposed in the slot.
Preferably, the operating member includes an operating plate at least partially exposed to the notch, and the main body further includes a base plate located between the operating plate and the gearbox housing, and the operating plate is slidably supported on the base plate.
Preferably, the operating part further comprises a clamping part fixed on the operating plate and used for clamping the elastic part, the clamping part comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are respectively located on two sides of the elastic part along the output axis.
Preferably, the operating part further comprises a clamping part fixed on the operating plate and used for clamping the elastic part, the clamping part is provided with a stop groove extending along the axial direction, and the base plate extends into the stop groove.
Preferably, the operating part further comprises a clamping part fixed on the operating plate and used for clamping the steel wire, the clamping part is provided with a stop groove extending along the axial direction, the stop part is arranged on the base plate and extends to the stop groove, and the elastic part is exposed out of the stop groove and can be abutted against the stop part.
Preferably, the elastic member is integrally formed by steel wires, the steel wires include free ends respectively located at two sides of the axis of the output shaft and used for being matched and connected with the speed change gear ring, and the steel wires are symmetrically arranged relative to the axis of the output shaft.
Preferably, the area of the operation plate is larger than the area of the notch. .
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
figure 1 is a perspective view of a power drill according to an embodiment of the present invention;
figure 2 is a schematic view in partial section of a power drill according to an embodiment of the present invention;
FIG. 3 is a schematic view of the transmission of FIG. 2 with a portion of the gearbox housing removed and with the wire moved to another position by the operating member;
figure 4 is a further schematic view in partial cross-section of a power drill according to an embodiment of the present invention;
figure 5 is a schematic illustration of a power drill according to an embodiment of the present invention with half of the half main housing removed;
FIG. 6 is an enlarged view at A in FIG. 3;
FIG. 7 is a schematic structural view of a steel wire;
FIG. 8 is a schematic view of the operating member;
FIG. 9 is a schematic view of the engagement of the operating member with the wire;
FIG. 10 is a schematic partial cross-sectional view taken along line A2-A2 of FIG. 5.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1-5, a hand-held power tool, particularly an electric drill 100, of the present invention includes a housing 10, a motor 20 disposed in the housing 10, the motor 20 being configured to output rotational power.
The hand-held power tool further comprises an output shaft 3 for receiving a tool bit, and a transmission mechanism 40, wherein the transmission mechanism 40 can transmit the rotation power of the motor 20 to the output shaft 3, and a chuck (not shown) is connected to the output shaft 3. The drill 100 also includes a battery pack 80 for providing a source of power. Preferably, the housing 10 includes a gear case housing 101 covering the periphery of the transmission mechanism 40, and a main housing 102 covering at least part of the motor 20 and the gear case housing 101 and having a half shape, and the main housing 102 includes a main body portion 1020 covering at least part of the motor 20 and the gear case housing 101 and extending in the axial direction of the output shaft 3, and a handle portion 1021 arranged at an angle to the main body portion 1020.
Preferably, the transmission mechanism 40 in this embodiment is a three-stage planetary gear train, and the first-stage planetary gear train includes a first-stage sun gear (not shown) on the drive shaft 21 of the motor 20, a plurality of first-stage planetary gears (not shown) engaged with the first-stage sun gear, a first-stage ring gear 411 fixedly arranged with respect to the housing and engaged with the first-stage planetary gears, and a first-stage planetary carrier (not shown) driven to rotate by the first-stage planetary gears. The second-stage planetary gear train comprises a second-stage sun gear (not shown) arranged on the first-stage planet carrier, a second-stage planet gear 421 meshed with the second-stage sun gear, a second-stage ring gear 423 meshed with the second-stage planet gear 421 and a second-stage planet carrier 424 driven to rotate by the second-stage planet gear 421. The third stage planetary gear train includes a third stage sun gear (not shown) disposed on the second stage planet carrier 424, a third stage planet gear (not shown) engaged with the third stage sun gear, a third stage ring gear (not shown) fixedly disposed with respect to the housing and engaged with the third stage planet gear, and a third stage planet carrier 431 driven to rotate by the third stage planet gear. The third stage carrier 431 transmits the rotational power to the output shaft 3.
Preferably, in the present embodiment, the third-stage planetary carrier 431 transmits power to the adaptor 44 through a flat-square structure (not shown in the figure), and the adaptor 44 transmits power to the output shaft 3 through the flat-square structure.
Referring to fig. 4, in order to change the rotational speed of the drive shaft 21 transmitted to the output shaft 3, the transmission mechanism is moved in the axial direction of the output shaft through the secondary ring gear 423 to change its own transmission ratio. Preferably, the secondary ring gear 423 is movable axially along the output shaft 3 between a first switching position close to the motor 20 and a second switching position away from the motor 20, when in the first switching position, the secondary ring gear 423 is fixed in a rotational direction with respect to the housing, and the secondary ring gear 423 is engaged with the second planet gears.
Preferably, in this embodiment, the primary ring gear 411 is fixedly disposed relative to the housing, and one end of the primary ring gear 411 close to the tool head is provided with a first fixing member 4110, one end of the secondary ring gear 423 close to the primary ring gear 411 is provided with a second fixing member 4230, and when the secondary ring gear 423 is located at the first switching position, the first fixing member 4110 is coupled to the second fixing member 4230 to fix the secondary ring gear 423 relative to the housing 10 in a rotation direction. When the secondary ring gear 423 is located at the second switching position, the secondary ring gear 423 is simultaneously meshed with the secondary planet gears 421 and 424 and rotates together with the secondary planet gears 421 and 424.
It should be noted that, in this embodiment, only one embodiment of the second-stage ring gear 423 that changes the transmission ratio of the transmission mechanism 40 by moving axially is shown, and it should be understood that other manners may be adopted for fixing the second-stage ring gear 423 with respect to the housing, and details are not described here.
Referring to fig. 2, 5 and 7, the power tool further includes an operating element 50 movably disposed in the housing, and the operating element drives the secondary ring gear 423 to move between a first switching position and a second switching position through an elastic element, that is, the operating element 50 switches between the first operating position (the position of the operating element shown by a dotted line in fig. 5) and the second operating position along the axial direction of the output shaft 3, and drives the elastic element to move along the axial direction of the output shaft, and the elastic element drives the secondary ring gear 423 to move between the first switching position and the second switching position along the axial direction of the output shaft. Preferably, the resilient member is a deformable steel wire 60. The wire 60 is substantially arcuate and symmetrically disposed with respect to the axis of the output shaft, and includes two free ends 61 coupled to the secondary ring gear 423. Preferably, the secondary ring gear 423 is provided with radial holes (not shown), two free ends of the radial holes are inserted into the radial holes, and the steel wire 60 moves axially along the output shaft under the action of the operating member 50 and drives the secondary ring gear 423 to move between the first switching position and the second switching position. It is understood that the wire 60 can also perform the pivotal movement under the action of the operating member 50, but at the same time can drive the secondary annular gear 423 to move between the first switching position and the second switching position, which will not be described in detail herein.
In this embodiment, in order to position the secondary ring gear 423 at the first switching position and the second switching position, the abutting member 100 is disposed on the housing, and when an external force applied to the steel wire 60 by an operator through the operating member 50 is greater than an elastic force of the steel wire 60, the steel wire 60 can elastically deform to overcome a stopping action of the stopping member 100 on the steel wire 60, so as to drive the secondary ring gear to move from one of the first switching position and the second switching position to the other of the first switching position and the second switching position; when the external force applied to the wire 60 is smaller than the elastic force of the wire itself, the wire 60 abuts against the stopper 100 to prevent the secondary ring gear 423 from being switched from one of the first switching position and the second switching position to the other of the first switching position and the second switching position. In this embodiment, it is preferable that the main body portion is provided with a slot 1024, one of the main body portion 1020 and the operation member 50 is provided with a guide rail, and the other is provided with a guide groove, so that the operation member 50 is slidably disposed in the slot 1024.
With continued reference to fig. 3 and 8-10, the operating member 50 includes an operating plate 501, the operating plate 501 is at least partially exposed from the slot 1024, guide rails 5011 are disposed on both sides of the operating plate 501, and the main body 1020 is provided with a guide groove 1023. The main body 1020 further includes a base plate 1022 located between the operating plate 501 and the gearbox housing 101, preferably, the base plate 1022 is horizontally disposed, and the operating plate 501 is slidably supported on the base plate 1022, so that the base plate 1022 is disposed, which not only allows the operation member 50 to move more smoothly, but also allows the main body 1020 to be structurally stronger and more reliable. In the present embodiment, the horizontal direction refers to a plane parallel to the X axis and perpendicular to the Y axis, taking the orientation shown in fig. 5 as an example.
Referring to fig. 8 and 9, the operating member 50 further includes a clamping portion 5012 fixed to the operating plate 501 for clamping the elastic member, the clamping portion 5012 includes a first clamping plate 5013 and a second clamping plate 5014, and the first and second clamping plates 5013 and 5014 are respectively located on both sides of the steel wire along the output axis. By providing the first clamping plate 5013 and the second clamping plate 5014 on both sides of the steel wire 60, the movement of the steel wire 60 along the axis of the output shaft by the operation member 50 is made smoother. The clamping portion 5012 is provided with a stopper slot 5015 extending in the axial direction, and the base plate 1022 extends into the stopper slot 5015. The mating between the base 1022 and the stop slot 5015 can also provide a guiding function for the operating member 50 when the operating member 50 is moved by an external force. The stopper 100 is disposed on the base plate 1022 and extends to the stopper slot 5015, and the wire 60 is exposed to the stopper slot 5015 and can abut against the stopper 100.
In this embodiment, in order to better enable the steel wire 60 to drive the secondary ring gear to move along the axial direction of the output shaft, the steel wire is substantially arched and includes a clamping section 62 connected with the clamping portion 5012 and an arc section 63 located between the clamping section 62 and the free end, the arc section 63 is configured to surround the periphery of the gearbox housing 101 in a shape matching manner, and when the operating element 50 drives the steel wire 60 to move under the action of an external force, the arc section 63 moves along the periphery of the gearbox housing 101. In addition, the above-mentioned clamping section 62 includes a stopper section 621 extending in the longitudinal direction to abut against the stopper 100.
Referring to fig. 1, in this embodiment, the area of the substrate 1022 is greater than the area of the notch 1024, and in addition, a collar 1025 matched with the notch in shape is further disposed at the notch of the notch 1024, so that the collar 1025 can not only play a role of beauty, but also prevent dust from entering the housing from the notch.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features.
In the description of the present invention, "a plurality" means two or more.
In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween.
In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A hand-held power tool comprising:
a motor for outputting rotational power;
a housing accommodating the motor;
an operating member operatively movably disposed relative to the housing;
an output shaft for coupling to a tool bit;
a transmission mechanism including a speed change ring gear movable between a first switching position and a second switching position to enable the transmission mechanism to transmit the rotation speed of the motor to the output shaft at different gear ratios; and
the elastic piece is in transmission connection between the operating piece and the speed change gear ring; the method is characterized in that: the hand-held power tool further comprises a stop piece arranged on the shell, and the stop piece can be abutted against the elastic piece to prevent the elastic piece from driving the speed change gear ring to be freely switched between a first switching position and a second switching position; when the external force applied to the elastic piece by an operator through the operating piece is greater than the elastic force of the elastic piece, the elastic piece can elastically deform to overcome the stopping action of the stop piece on the elastic piece, so that the gear shifting ring can be driven to move from one of the first switching position and the second switching position to the other of the first switching position and the second switching position; when the external force applied to the elastic element is smaller than the elastic force of the elastic element, the elastic element is abutted against the stop element to prevent the gear ring from being switched from one of the first switching position and the second switching position to the other of the first switching position and the second switching position.
2. The hand-held power tool of claim 1, wherein: the elastic piece comprises a steel wire, the steel wire comprises a free end which is used for being matched and connected with the variable-speed gear ring, and the two free ends of the steel wire are arranged on the two sides of the axis of the output shaft.
3. The hand-held power tool of claim 1, wherein: the elastic piece drives the speed-changing gear ring to move between a first switching position and a second switching position along the axial direction of the output shaft under the action of the operating piece.
4. The hand-held power tool of claim 1, wherein: the housing includes a gearbox housing wrapped around the transmission mechanism and a main body portion covering at least a portion of the motor and the gearbox housing.
5. The hand-held power tool of claim 4, wherein: the main body part is provided with a notch, one of the main body part and the operating part is provided with a guide rail, and the other of the main body part and the operating part is provided with a guide groove, so that the operating part can be arranged in the notch in a sliding mode.
6. The hand-held power tool of claim 5, wherein: the operating member comprises an operating plate at least partially exposed out of the notch, the main body part further comprises a base plate located between the operating plate and the gearbox shell, and the operating plate is slidably supported on the base plate.
7. The hand-held power tool of claim 6, wherein: the operating part is still including being fixed in the operation panel and being used for the clamping part of centre gripping elastic component, the clamping part includes first splint and second splint, just first, second splint are located the both sides of elastic component respectively along output axis.
8. The hand-held power tool of claim 6, wherein: the operating part is still including being fixed in the operation panel and being used for the clamping part of centre gripping elastic component, the clamping part is equipped with along the backstop groove of axial extension, the base plate extends to in the backstop groove.
9. The hand-held power tool of claim 7, wherein: the operating part is still including being fixed in the operation panel and being used for the clamping part of centre gripping steel wire, the clamping part is equipped with along the backstop groove of axial extension, the stop member set up in the base plate extends to the backstop groove, the elastic component expose in the backstop groove and can with the stop member butt.
10. The hand-held power tool of claim 1, wherein: the elastic piece is integrally formed by a steel wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911257473.9A CN112936191A (en) | 2019-12-10 | 2019-12-10 | Hand-held power tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911257473.9A CN112936191A (en) | 2019-12-10 | 2019-12-10 | Hand-held power tool |
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| Publication Number | Publication Date |
|---|---|
| CN112936191A true CN112936191A (en) | 2021-06-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911257473.9A Pending CN112936191A (en) | 2019-12-10 | 2019-12-10 | Hand-held power tool |
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| CN (1) | CN112936191A (en) |
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| CN1247120A (en) * | 1998-07-14 | 2000-03-15 | 松下电工株式会社 | Rotary tool with speed variating mechanism |
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| US20100132497A1 (en) * | 2008-12-02 | 2010-06-03 | Joachim Hecht | Handheld power tool with a shiftable gear |
| CN202278563U (en) * | 2011-10-08 | 2012-06-20 | 东莞百事得电动工具有限公司 | Impact drill |
| EP2551063A1 (en) * | 2011-07-27 | 2013-01-30 | C. & E. Fein GmbH | Switch device and machine tool with a switch device |
| CN203892478U (en) * | 2014-05-16 | 2014-10-22 | 东莞百事得电动工具有限公司 | Speed change device for speed change gearbox of electric tool |
| CN203892547U (en) * | 2014-05-16 | 2014-10-22 | 东莞百事得电动工具有限公司 | Speed change buffer device for speed change gearbox of electric tool |
| CN107237887A (en) * | 2017-07-01 | 2017-10-10 | 浙江亚特电器有限公司 | A kind of planetary gear roller box and electric tool |
| CN208468296U (en) * | 2018-06-26 | 2019-02-05 | 宁波汉浦工具有限公司 | A kind of electric tool based on small and special electric machine |
| CN110496994A (en) * | 2018-05-18 | 2019-11-26 | 宝时得科技（中国）有限公司 | Electric tool |
| CN211709215U (en) * | 2019-12-10 | 2020-10-20 | 苏州宝时得电动工具有限公司 | Hand-held power tool |
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2019
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| CN1247120A (en) * | 1998-07-14 | 2000-03-15 | 松下电工株式会社 | Rotary tool with speed variating mechanism |
| CN1411958A (en) * | 2001-10-06 | 2003-04-23 | 罗伯特·博施有限公司 | Two-stage speed variator device for converting electric tool |
| CN1419997A (en) * | 2001-11-16 | 2003-05-28 | 罗伯特·博施有限公司 | Shift device of multi-speed gear-box for electric machine tool |
| US20100132497A1 (en) * | 2008-12-02 | 2010-06-03 | Joachim Hecht | Handheld power tool with a shiftable gear |
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| CN203892547U (en) * | 2014-05-16 | 2014-10-22 | 东莞百事得电动工具有限公司 | Speed change buffer device for speed change gearbox of electric tool |
| CN107237887A (en) * | 2017-07-01 | 2017-10-10 | 浙江亚特电器有限公司 | A kind of planetary gear roller box and electric tool |
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