CN212887454U

CN212887454U - Power tool and accessory thereof

Info

Publication number: CN212887454U
Application number: CN202021509618.8U
Authority: CN
Inventors: 郑悦; 钟红风; 张士松; 孙益民
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2019-07-25
Filing date: 2020-07-27
Publication date: 2021-04-06
Anticipated expiration: 2030-07-27
Also published as: WO2021012531A1; CN112276870A

Abstract

The utility model provides a power tool, which comprises a main shell; a motor accommodated in the main housing; the chuck comprises a chuck shell, a chuck core body and a plurality of clamping jaws, wherein the chuck core body is arranged in the chuck shell and driven by a motor shaft, the clamping jaws are arranged on the chuck core body, the chuck shell is fixedly arranged relative to the main shell, and the chuck shell is provided with a chuck interface part; the accessory comprises an accessory shell and an accessory body at least partially contained in the accessory shell, the accessory shell is provided with an accessory interface part in interference fit with the chuck interface part, the accessory body is movably arranged relative to the accessory shell, the accessory body comprises an input part and an output part, and when the accessory interface part is matched with the chuck interface part, the input part can be clamped by a clamping jaw, so that the rotary power of the motor can be transmitted to the output part. The problem of power tool and annex be connected inconvenient, unstable is solved. The present invention provides an accessory for mating with a tool.

Description

Power tool and accessory thereof

Technical Field

The utility model relates to a power tool technical field, in particular to power tool and annex thereof.

Background

Power tool functional accessories are now extremely versatile and varied. After the functional accessories are combined with the power tool, different working condition requirements can be met; for example, to improve the accessibility of the tool, an eccentric attachment can be attached to the original tool, such that the output shaft of the attachment is closer to the workpiece than the tool spindle; for example, in order to increase the rotational speed of the output shaft, a speed increasing mechanism accessory can be added, so that the rotational speed of the output shaft of the accessory is higher than that of the tool spindle; for example, to slow the rotational speed of the output shaft, a reduction mechanism attachment may be added such that the rotational speed of the output shaft of the attachment is lower than the rotational speed of the tool spindle, and so on.

For a power tool with a three-jaw chuck, a working head is usually clamped by three jaws of the chuck, such as a drill bit, and the working head can be drilled after being clamped by the jaws of the chuck, such as a batch head, and can be screwed after being clamped by the jaws of the chuck. When the existing chuck is installed on a working head and works, the outer shell of the chuck rotates along with the core body of the chuck. If a further functional accessory as described above is to be attached to a power tool having such a chuck, the following is generally used: the mode is that the three-jaw chuck is detached from the power tool, and then the functional accessory is matched and connected with the power tool main body; the second mode is that the chuck does not need to be detached from the power tool, but the accessory is connected with the machine body shell by adopting a connecting mechanism, and then the clamping jaws are fixedly connected with the transmission shaft of the accessory in a clamping way; the third mode is to directly clamp the claw and the transmission shaft of the accessory to prevent shaking, and the accessory shell is held by hands to stop rotation when in use.

In the first mode, the disassembly and the assembly of the chuck are time-consuming and troublesome in operation; the connecting mechanism of the second mode needs to span the distance of the chuck and then is connected with the main case, so that the size is large, and the miniaturization of the structure is not facilitated; the operation mode of the third mode is to prevent shaking and to use hands to support, which is not only not humanized but also has potential safety hazard.

In order to solve the above problems in the prior art, there is a need for an improved functional accessory and power tool.

Disclosure of Invention

Based on the technical problem stated above, the utility model provides a modified power tool.

The utility model provides a power tool, it includes:

a main housing;

the chuck comprises a chuck shell, a chuck core body which is arranged in the chuck shell and driven by the motor to rotate, a plurality of jaws which are arranged on the chuck core body, and a driving piece which is in threaded connection with the jaws, wherein the jaws can move between a mutually close position and a mutually separated position relative to the core body; the chuck shell is fixedly arranged relative to the main shell, and is provided with a chuck interface part;

the accessory comprises an accessory shell and an accessory body at least partially contained in the accessory shell, the accessory shell is provided with an accessory interface part used for being matched and connected with the chuck interface part, the accessory body is movably arranged relative to the accessory shell, the accessory body comprises an input shaft input part and an output shaft output part connected with the input shaft input part, when the accessory interface part is matched and connected with the chuck interface part, the input shaft input part can be clamped by the plurality of clamping claws, and therefore the power of the motor can be transmitted to the output shaft output part through the input shaft input part.

By adopting the technical scheme, the chuck shell does not rotate, and the chuck interface part is matched and connected with the accessory interface part, so that tools and fasteners are not used, the accessory is simple in structure and convenient to operate, and the miniaturization of the whole machine is facilitated; the input part is fixed by the clamping jaw, so that the output coaxiality of the chuck core body and the accessory body is ensured, and the transmission is stable.

Preferably, the power tool comprises a mode shift mechanism operable to shift the power tool between a chuck mode and a drill mode; when the power tool is in a chuck mode, the motor drives one of the chuck core and the driver to rotate relative to the other so as to move the plurality of jaws relative to the chuck core to clamp the input shaft input or release the input shaft input; when the power tool is in a drill mode, the plurality of jaws clamp the input shaft input portion and can continuously output power for the output shaft output portion.

Preferably, when the power tool is in the chuck mode, the chuck core is fixed relative to the chuck housing and the motor drives the driver to move relative to the chuck core to drive the jaws relative to the core between the mutually closed position and the mutually open position.

Preferably, the power tool further comprises an output planetary gear train which is at least partially arranged in the chuck shell and at least partially overlapped with the jaws in the axial direction of the motor shaft, wherein the output planetary gear train comprises output planetary gears arranged on the chuck core body and an output gear ring arranged on the periphery of the output planetary gears, when the power tool is in the chuck mode, the output gear ring can drive the driving part to rotate relative to the core body under the driving of the motor, and when the power tool is in the drill mode, the output planetary gears can drive the chuck core body to rotate so that the jaws can continuously provide power for the input part.

Preferably, the driving member is a nut sleeve arranged on the outer side of the plurality of jaws.

Preferably, the cartridge housing includes a mating end coupled to the main housing, the mating end and the cartridge interface being stepped such that an outer peripheral surface of the cartridge interface is closer to a centerline of the cartridge body than an outer peripheral surface of the mating end.

By adopting the technical scheme, the power tool is provided with a chuck mode, so that the accessory can be fixed or released more conveniently; and the drilling mode of the power tool ensures the stable power source of the accessory.

Preferably, the accessory interface portion has a main body, and at least one connector disposed inside the main body; the chuck interface part is provided with at least one second connecting piece, when the accessory interface part is matched and connected with the main body, the first connecting piece and the second connecting piece are fixed, and the peripheral surface of the annular main body does not exceed the height of the peripheral surface of the matching end.

In one embodiment, the accessory interface portion comprises at least one first connection portion, the collet interface portion comprises a second connection portion corresponding to the first connection portion, one of the first and second connection portions is configured as a projection, and the other of the first and second connection portions is configured as a recess that mates with the projection.

By adopting the technical scheme, the accessory can be conveniently connected to the chuck shell by matching the convex block with the concave notch, the assembly and disassembly are convenient, and the positioning is accurate; of course, other structures capable of connecting and positioning the accessory and the chuck are also within the scope of the invention, such as a buckle, a positioning pin, etc.

The utility model also provides an accessory which can be detachably matched and connected with the chuck of the power tool, and the power tool comprises a main shell; a motor accommodated in the main housing; the chuck comprises a chuck shell, a chuck core body which is arranged in the chuck shell and driven by the motor, a plurality of clamping jaws which are arranged on the chuck core body, and a driving piece which is in threaded connection with the plurality of clamping jaws, wherein the plurality of clamping jaws can move between a mutually close position and a mutually separated position relative to the core body; the cartridge housing is fixedly disposed relative to the main housing, the cartridge housing is provided with a cartridge interface portion, the accessory includes:

an accessory housing provided with an accessory interface for mating with the collet interface;

the accessory comprises an accessory body, wherein the accessory body is movably arranged relative to an accessory shell, the accessory body comprises an input shaft input part and an output shaft output part which are connected with each other, the input shaft input part is used for being clamped by the plurality of clamping jaws when the accessory connecting part is matched and connected with the chuck connecting part, and therefore power of the motor can be transmitted to the output shaft output part through the input shaft input part.

By adopting the technical scheme, the accessory is convenient to connect and operate, the connecting structure is simple, and the miniaturization of the whole machine is more facilitated.

Preferably, the accessory body further comprises a transmission mechanism disposed between the input and output portions, the movement of the input portion being transmitted to the output portion by the transmission mechanism.

Preferably, the input portion is arranged in parallel with the output portion. By adopting the technical scheme, the position of the output part can be changed, and the accessibility is improved.

In another alternative embodiment, the input and output have a speed differential when rotating.

In yet another alternative embodiment, the transmission mechanism is provided as a speed reducer.

By adopting the technical scheme, the accessory can play a role in changing the transmission ratio.

The utility model also discloses an installation method of the power tool, the power tool comprises a main shell; a motor accommodated in the main housing; the chuck comprises a chuck shell, a chuck core body which is arranged in the chuck shell and driven by the motor, an accommodating hole which is positioned in the chuck core body, and a plurality of clamping jaws which are arranged on the chuck core body and surround the accommodating hole, wherein the clamping jaws can move between a mutually close position and a mutually separated position relative to the core body, the chuck shell is fixedly arranged relative to the main shell, and the chuck shell is provided with a chuck interface part; an accessory including an accessory housing and an accessory body movably disposed relative to the accessory housing, the accessory housing having an accessory interface portion for interference mating with the collet interface portion, the input shaft input being clampable by the plurality of jaws when the accessory interface portion is mated with the collet interface portion, thereby enabling power from the motor to be transferred through the input shaft input to the output shaft output, the method comprising the steps of: the method comprises the following steps: judging whether the input part of the input shaft can be inserted into the accommodating hole, if so, turning to the third step; if not, continuing the step two; step two: separating the plurality of jaws from each other; step three: inserting an input shaft input into the receiving hole, and simultaneously connecting the accessory interface part with the chuck interface part; step four: the plurality of jaws are brought together to clamp the input shaft input.

Preferably, the power tool comprises a mode shift mechanism operable to shift the power tool between a chuck mode and a drill mode; when the power tool is in a chuck mode, the chuck core is selectively fixed relative to the chuck housing, and the motor drives the driving member to rotate relative to the chuck core, so that the clamping jaws can move relative to the chuck core to clamp the input shaft input part or release the input shaft input part; when the power tool is in a drilling mode, the plurality of clamping jaws clamp the input shaft input part and can continuously output power for the output shaft output part; before the second step or the fourth step before the plurality of clamping jaws are mutually separated or mutually close, the power tool is set to a chuck mode, and then the motor is rotated to drive the clamping jaws to move.

Compared with the prior art, the utility model has the advantages of it is following:

1) the chuck shell does not rotate, the chuck interface is matched with the accessory interface, the accessory connection operation is convenient, the connection structure is simple, and the miniaturization of the whole machine is facilitated;

2) the power tool does not need to be supported by hands in the using process, and is stable to operate;

3) the chuck and the accessories adopt a universal interface, and the power tool chuck can be adapted to various accessories, so that a new idea is provided for widening the application scene of the power tool.

Drawings

FIG. 1 is a perspective view of an attachment of the present invention;

FIG. 2 is a perspective view of the power tool of the present invention;

FIG. 3 is a cross-sectional schematic view of the power tool of FIG. 2 with the accessory attached;

FIG. 4 is a partial cross-sectional schematic view of another embodiment of a power tool with an accessory attached in a drill mode;

fig. 5 is a partial cross-sectional schematic view of the power tool of fig. 4 with the accessory mated in a chuck mode.

The relevant elements in the figures are numbered correspondingly as follows:

100. the power tool comprises a power tool body 1, a chuck, 10, jaws, 11, a chuck core body 12, a chuck shell 13, notches, 14, screws, 15, a chuck interface part 16, a first bearing 17, a second bearing 18, a nut sleeve 19, a locking part 2, an accessory, 20, an input shaft 21, a speed reducer 22, an output shaft 23, an accessory interface part 24, a lug 25, an accessory shell 3, a motor 4, a transmission mechanism 41, a reduction gearbox shell 5 and a main shell.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a functional accessory 2 for attachment to a chuck 1 of a power tool 100, in particular, the accessory 2 is provided as an offset accessory, the accessory 2 comprising an accessory housing 25 and an accessory body at least partially received in the accessory housing 25, the accessory body in particular comprising an input shaft 20, an output shaft 22, and a speed reducer 21 (shown in fig. 3) positioned between the input shaft 20 and the output shaft 22, an accessory interface 23 is provided on the accessory housing 25, the accessory interface 23 including at least one tab 24, certainly, a plurality of bumps 24 may also be provided, in this embodiment, the accessory interface 23 includes four bumps 24 arranged along the peripheral direction of the accessory interface, the whole accessory body can rotate relative to the accessory housing 25, and the rotation of the input shaft 20 is transmitted to the output shaft 22 through the speed reducer 21, so as to achieve the purpose of reducing the transmission ratio.

As shown in fig. 2 and 3, there is provided a power tool 100 including: a main housing 5; a motor 3 accommodated in the main casing 5, the motor 3 having a motor shaft; a power source for providing power to the motor 3, where the power source is a dc power source, and a lithium battery pack is adopted, which is a technology well known to those skilled in the art and will not be described in detail, and it is understood that in other embodiments, other modes may be adopted to provide power to the motor 3; the

chucks

1 and 1 are driven by the motor shaft of the motor 3, however, a transmission mechanism 4 can be arranged between the motor 3 and the chucks 1, and the transmission mechanism 4 is generally arranged as a speed reducing mechanism, which is well known to those skilled in the art and will not be described in more detail.

Specifically, the chuck 1 comprises a chuck shell 12, a chuck core body 11, an accommodating hole positioned in the chuck core body 11, a plurality of jaws 10 arranged around the accommodating hole, and a driving member in threaded connection with the jaws 10; the chuck core body 11 is driven by a motor shaft of the motor 3, and the number of the claws 10 is three and is distributed along the circumferential direction of the chuck core body 11; the cartridge housing 12 is fixed relative to the main housing 5 of the power tool 100; in the embodiment, the main shell 5 and the chuck shell 12 are fixedly installed through screws 14; the driving piece is a nut sleeve 18 arranged on the outer side of the jaw 10, the accommodating hole is used for inserting a working head or an accessory input shaft, and the jaw 10 is used for clamping the working head or the input shaft.

With continued reference to fig. 2, the chuck housing 12 is provided with a chuck interface 15, the chuck housing includes a mating end connected to the main housing 5, the chuck interface 15 and the mating end form a step surface, and an outer peripheral surface of the chuck interface 15 is closer to a center line of the chuck relative to an outer peripheral surface of the mating end, that is, the outer peripheral surface of the chuck interface 15 is recessed toward the center line of the chuck relative to the outer peripheral surface of the mating end. The accessory interface 23 comprises an annular body for being sleeved on the outer periphery of the collet interface 15, the protrusion 24 is disposed on the inner peripheral surface of the annular body, the collet interface 15 comprises at least one recess 13, and in this embodiment, the collet interface 15 comprises a plurality of recesses 13 disposed along the circumferential direction of the collet interface 15. The notches 13 are used for being in interference fit with the protruding blocks 24 in a one-to-one correspondence manner, so that the accessory 2 is prevented from falling and loosening in the working process of the power tool, and the safety is improved. Of course, it is contemplated by those skilled in the art that the arrangement of the recesses 13 and the projections 24 may be reversed, with the projections 24 being disposed on the collet interface 15 and the recesses 13 being disposed on the accessory interface 23. In this embodiment, except for the chuck interface 15, the outer peripheral surface of the other part of the chuck housing is substantially a smooth curved surface, and by disposing the interface 15 to be recessed relative to the outer peripheral surface of the mating end, when the accessory is externally connected to the chuck housing, the recess and the protrusion are fixedly connected, the outer peripheral surface of the annular main body does not exceed the height of the outer peripheral surface of the mating end, and the outer peripheral surface of the mating end and the outer peripheral surface of the annular main body are substantially on the same curved surface, so that a smooth transition can be formed therebetween.

The power tool 100 includes a drill mode and a chuck mode, and the power tool further includes a mode switching mechanism (not shown) operable to switch the power tool between the chuck mode and the drill mode; when the power tool 100 is in the drill mode, the cartridge body 11 is rotatable relative to the cartridge housing 12, and the nut sleeve 18 rotates with the jaws 10 and the cartridge body 11; the power of the motor 3 is transmitted to the chuck core body 11 through a motor shaft, so that the chuck core body 11 and the nut sleeve 18 rotate together to drive the jaws 10 to continuously output power in a fixed form; when the power tool 100 is in a chuck mode, the chuck core body 11 can be fixed relative to the chuck shell 12 under the action of the mode switching mechanism, the power of the motor 3 is transmitted to the nut sleeve 18 through the motor shaft, so that the nut sleeve 18 is driven to rotate, the jaws 10 connected with the nut sleeve 18 move axially, the jaws 10 fix the input shaft 20 through clamping, or the nut sleeve 18 rotates in the opposite direction to drive the jaws 10 to move axially in the opposite direction to release the fixation of the input shaft 20; it can be understood that, in the present embodiment, the output shaft 22 and the input shaft 20 are two shafts arranged in parallel, one end of the input shaft 22 close to the motor is provided with an input part, the clamping jaw clamps the input part to transmit the power of the motor to the input shaft, and one end of the output shaft far from the motor is provided with an output part, so that the power can be transmitted through the output part. It will be appreciated that in other embodiments the attachment may comprise only one shaft, i.e. the input and output portions are both ends of the same shaft. It is worth mentioning here that the chuck in this embodiment is an automatic chuck, i.e. the jaws of the chuck are driven by the power of a motor to move between a locking position, in which they are moved towards each other, and a release position, in which they are moved away from each other.

As shown in fig. 3, a first bearing 16 is provided between one end of the cartridge body 11 remote from the motor 3 and the cartridge interfacing portion 15, and a second bearing 17 is provided between the other end of the cartridge body 11 close to the motor 3 and the reduction gear housing 41 of the power tool 100; the arrangement of the first bearing 16 can reduce the abrasion between the chuck core body 11 and the chuck interface part 15, the arrangement of the second bearing 17 can reduce the abrasion between the chuck core body 11 and the reduction gearbox shell 41, at the moment, the outer ring of the first bearing 16 is fixedly arranged with the chuck interface part 15, the inner ring of the first bearing 16 is fixedly arranged with the chuck core body 11, the outer ring of the second bearing 17 is fixedly arranged with the chuck core body 11, and the inner ring of the second bearing 17 is fixedly arranged with the reduction gearbox shell 41; meanwhile, since the cartridge body 11 and the cartridge housing 12 are relatively rotatably fixed, the first bearing 16 and the second bearing 17 support the cartridge body 11 in common.

The power tool is fitted with the offset accessory 2 shown in fig. 1, the input shaft 20 of the accessory 2 in this embodiment extends parallel to the output shaft 22, through the axis of the output shaft 22 closer to the top surface of the main housing 5 than the axis of the input shaft 20; in the present embodiment, since the input shaft 20 is coaxial with the axis of the cartridge body 11, the axis of the output shaft 22 is closer to the top surface of the main housing 5 than the axis of the cartridge body 11; the power tool output shaft is translated relative to the power tool by mating with an offset attachment 2. Specifically, since the axis of the output shaft 22 is close to the top surface of the tool main housing 5, when the receiving portion at the free end of the output shaft 22 is connected with the working head, the working head can be close to a workpiece to be machined, and the working head cannot be close to the workpiece to perform work due to interference of the distance from the top surface of the main housing 5 to the axis of the output shaft, the power tool equipped with the biasing accessory 2 is compared with a power tool with only a three-jaw chuck, and the accessibility is improved due to the fact that the position of the final output shaft is changed relative to the position of the machine body.

The offset attachment 2 in the present embodiment is used for the speed reducer 21, and is capable of reducing the rotational speed output from the chuck core 11 and transmitting the reduced rotational speed to the output shaft 22, thereby performing a speed reduction function.

Of course, those skilled in the art can conceive that the biasing function and the deceleration function of the accessories can be respectively realized by arranging different accessories, and when the requirements are met by different working conditions, the operators can select to install different functional accessories according to the requirements. In addition, the functional attachment may also include attachments that convert rotational motion into other forms of motion, such as converting rotational motion into yaw motion, linear reciprocating motion, rotational reciprocating motion, and the like.

Fig. 4 and 5 show two different modes of operation, respectively, of another embodiment of a power tool, differing from the previous embodiment in that in the chuck mode, the nut sleeve is fixed and the chuck body is rotated relative to the nut sleeve to move the drive jaws between the locked and released positions. Specifically, the mode switching mechanism includes an operable locking member 19. As shown in fig. 4, when the power tool 100 is in the drill mode, the cartridge body 11 is not fixed, the nut sleeve 18 is not locked, and the power of the motor 3 is transmitted to the cartridge body 11 through the motor shaft, so that the cartridge body 11 rotates to drive the jaws 10 to continuously output power in a fixed form; as shown in fig. 5, when the power tool 100 is in the chuck mode, the nut sleeve 18 is fixed by the locking member 19, the power of the motor 3 is transmitted to the chuck body 11 through the motor shaft to rotate the chuck body 11 and the jaws 10, and since the nut sleeve 18 does not rotate, the jaws 10 rotate while moving forward to clamp the input shaft 20, or the chuck body 10 rotates in the opposite direction to rotate the jaws 10 in the opposite direction to move backward to release the fixed input shaft 20; it should be noted that the chuck mode of the power tool 100 in this embodiment is automatic because the chuck housing 12 is fixed to the main housing 5.

With continued reference to fig. 3, the power tool 100 further includes an output planetary gear train disposed within the chuck, the output planetary gear train including output planet gears 60 disposed on the chuck core 11 and an output ring gear 61 disposed on the outer periphery of the output planet gears 60. When the power tool 100 is in the drilling mode, the output gear 61 is fixed relative to the main housing 5 or the chuck housing 12 under the action of the mode switching mechanism, and the output planetary gear 60 drives the core 11 and the clamping jaws 10 in the core 11 to rotate under the driving of the motor 3, so that power is transmitted to the output part of the accessory; when the power tool 100 is in the chuck mode, the mode switching mechanism releases the fixation of the output ring gear 61 and fixes the core body 11 with respect to the main housing 5 or the chuck housing 12, and at this time, the output ring gear 61 can be rotated with respect to the main housing 5 or the chuck housing 12 by the driving of the motor 3 and transmits power to the driving member (the nut sleeve 18) to rotate the nut sleeve 18 with respect to the jaws, thereby achieving the opening or closing of the jaws. In the embodiment, the output planetary gear train is arranged in the chuck, so that the output planetary gear train not only can play a role of speed reduction in the drilling mode, but also cannot increase the axial length of the whole machine along the motor due to the existence of the output planetary gear train. The arrangement mode enables the structure of the tool to be short, short and compact, so that the whole machine body is not too long even the tool is externally connected with an accessory, and compared with the prior art, the tool is better in operability after the accessory is externally connected.

The installation method of the power tool of one embodiment comprises the following steps:

the method comprises the following steps: judging whether the input part can be clamped by the clamping jaws 10 or not by inserting the input part into the accommodating holes among the clamping jaws 10 tentatively, if so, turning to the third step; if not, continuing the step two;

step two: separating the jaws 10 from each other, and stopping the jaws 10 when they are released to be able to be inserted into the input portion;

step three: inserting the input portion into the receiving hole while mating the accessory interface portion 23 with the collet interface portion 15;

step four: the jaws 10 are brought together to grip the input.

In another embodiment, the mode shifter is operated to shift the power tool to the chuck mode before the jaws 10 are moved apart or together, and the motor is rotated to move the jaws apart or together.

Specifically, when the power tool 100 is operated to be in the drill mode, the switch of the power tool 100 is turned on, and the protrusion 24 is engaged with the recess 13, so that the relative rotation is not possible, and at this time, the motor 3 of the power tool 100 transmits the rotational power to the speed reducer 4, the chuck core 11, the jaws 10, the input portion, the accessory speed reducer 21, and the output portion in sequence, thereby achieving the working purpose; when it is desired to remove the attachment 2 from the power tool 100, the power tool 100 is operated in the chuck mode to disengage the jaws 10 from each other to enable the input to be released, and then the power tool 100 is held in one hand and the attachment 2 is held in the other hand and pulled hard to disengage them.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A power tool, comprising:

a main housing;

a motor accommodated in the main housing;

an accessory removably coupled to the chuck, the accessory including an accessory housing and an accessory body at least partially received in the accessory housing, the accessory housing having an accessory interface portion for coupling to the chuck interface portion, the accessory body being movably disposed relative to the accessory housing, the accessory body including an input portion and an output portion coupled to the input portion, the input portion being grippable by the plurality of jaws when the accessory interface portion is coupled to the chuck interface portion, thereby enabling power from the motor to be transferred through the input portion to the output portion.

2. The power tool of claim 1, wherein: the power tool includes a mode shift mechanism operable to shift the power tool between a chuck mode and a drill mode; when the power tool is in the chuck mode, the motor rotates one of the chuck core and the driver relative to the other so as to move the jaws relative to the chuck core to clamp the input portion or release the input portion; when the power tool is in the drill mode, the jaws are able to grip the input and to continue to output power to the output.

3. The power tool of claim 2, wherein: when the power tool is in the chuck mode, the chuck core is fixed relative to the chuck housing and the motor drives the driver to move relative to the chuck core to drive the jaws relative to the core between a position in which the jaws are drawn together and a position in which the jaws are separated from each other.

4. The power tool of claim 1, wherein: the chuck shell comprises a matching end connected with the main shell, a step is formed between the matching end and the chuck interface part, and the peripheral surface of the chuck interface part is closer to the center line of the chuck core body relative to the peripheral surface of the matching end.

5. The power tool of claim 4, wherein: the accessory interface portion has an annular body and at least one first connector disposed inside the annular body; the chuck interface portion has at least one second connector, and when the accessory interface portion is mated with the chuck interface portion, the first connector is fixed with the second connector, and the peripheral surface of the annular body does not exceed the height of the peripheral surface of the mating end.

6. An accessory for removably coupling with a chuck of a power tool, the power tool including a main housing; a motor accommodated in the main housing; the chuck comprises a chuck shell, a chuck core body which is arranged in the chuck shell and driven by the motor, a plurality of clamping jaws which are arranged on the chuck core body, and a driving piece which is in threaded connection with the plurality of clamping jaws, wherein the plurality of clamping jaws can move between a mutually close position and a mutually separated position relative to the core body; the chuck housing is fixed relative to the main housing and is provided with a chuck interface, and the accessory comprises:

the accessory comprises an accessory body which is movably arranged relative to an accessory shell, the accessory body comprises an input part and an output part which are connected with each other, the input part is used for being clamped by the plurality of clamping claws when the accessory interface part is matched and connected with the chuck interface part, and therefore the power of the motor can be transmitted to the output part through the input part.

7. The accessory of claim 6, wherein: the accessory body further comprises a transmission mechanism arranged between the input part and the output part, and the motion of the input part is transmitted to the output part through the transmission mechanism.

8. The accessory of claim 7, wherein: the central axis of the input part is arranged in parallel with the central axis of the output part.

9. The accessory of claim 7, wherein: the input portion and the output portion have a speed difference when rotating.

10. The accessory of claim 7, wherein: the transmission mechanism is arranged as a speed reducer.