CN215847908U - Electric tool and electric tool chuck - Google Patents

Abstract

The utility model discloses an electric tool and an electric tool chuck, wherein the electric tool comprises: the chuck body is used for clamping a workpiece; the output shaft is used for transmitting torque to enable the chuck main body to rotate, the output shaft and the chuck main body are connected and limited through a connecting hole, and an axial connecting groove is formed in one end, inserted into the chuck main body, of the output shaft; the axial limiting piece is positioned inside the chuck main body and is connected with the chuck main body and the axial connecting groove; the connecting hole is of a first shape on a first section, the connecting hole is of a second shape on a second section, and the first shape is the same as the shape of the axial connecting groove on the first section. The electric tool replaces a key locking chuck in an angle drill type large-torque output tool, so that a user can conveniently and quickly replace accessories; compare in the threaded connection of ordinary hand tight chuck, the connecting hole has first shape and second shape, connects the reliability height, can bear bigger output torsion.

Description

Electric tool and electric tool chuck

Technical Field

The utility model relates to the technical field of electric tools, in particular to an electric tool and an electric tool chuck.

Background

The rotary electric tool generally refers to a tool that functions by rotation of a working accessory, such as a drill or a power screwdriver. The existing electric tool chuck structure causes that the accessories are troublesome to disassemble, and the chuck connection is not reliable enough. Therefore, it is desirable to provide an electric tool and an electric tool chuck to solve the above-mentioned technical problems in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide an electric tool which is convenient for a user to replace an accessory more conveniently and quickly and has high connection reliability.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the present invention provides an electric tool including:

the chuck body is used for clamping a workpiece;

the output shaft is used for transmitting torque to enable the chuck main body to rotate, the output shaft and the chuck main body are connected and limited through a connecting hole, and an axial connecting groove is formed in one end, inserted into the chuck main body, of the output shaft;

the axial limiting piece is positioned inside the chuck main body and is connected with the chuck main body and the axial connecting groove;

the connecting hole is of a first shape on a first section, the connecting hole is of a second shape on a second section, and the first shape is the same as the shape of the axial connecting groove on the first section.

In a preferred embodiment of the electric power tool, the second shape is a combination of the first shape and a third shape penetrating the first shape.

As a preferable mode of the above electric power tool, the connection hole includes a first connection hole and a second connection hole, and the first connection hole forms the second shape in the second section and the second connection hole in the second section; the chuck body rear end is equipped with card and portion, first connecting hole is followed the direction of output shaft runs through card and portion, and at least part passes the chuck body, the second connecting hole is located card and portion.

In a preferred embodiment of the power tool, the second connection hole has the same geometric center as the first connection hole, and at least one side of the second connection hole has a width larger than a diameter of the first connection hole.

As a preferable technical solution of the above electric tool, the output shaft is provided with a limiting portion, and the limiting portion is connected to the second connecting hole.

As a preferable aspect of the above electric power tool, the stopper portion includes:

the limiting base is abutted against the rear end face of the clamping part;

and the limiting convex block is arranged on the limiting base and locked with the second connecting hole.

As a preferable aspect of the above electric power tool, the chuck body further includes: a rotating sleeve assembly rotatable relative to the chuck body to move the jaws between a first position and a second position, the jaws moving to the second position with a maximum spacing between the inner sides of the jaws.

As a preferable aspect of the above electric power tool, the rotary sleeve assembly includes:

the rotating sleeve is positioned outside the chuck body and is rotationally connected with the chuck body;

the locking wheel is located inside the chuck body and fixedly connected with the rotating sleeve, an internal thread is arranged on the inner side of the locking wheel, and an external thread meshed with the internal thread is arranged on the outer side of the clamping jaw.

As a preferable technical solution of the above electric power tool, when the clamping jaw moves to the second position or the third position between the first position and the second position, the axial limiting member is detachably connected to the axial connecting groove; when the chuck is located at the third position, the interval between the inner sides of the clamping jaws is larger than or equal to the diameter of the axial limiting piece.

Another object of the present invention is to provide a power tool chuck that can be locked and unlocked more easily and quickly than the prior art, and has high connection reliability.

In order to realize the purpose, the utility model adopts the following technical scheme:

a power tool chuck comprising:

the chuck body is connected with the output shaft and used for clamping a workpiece; the output shaft is used for transmitting torque to enable the chuck main body to rotate, the output shaft and the chuck main body are connected and limited through a connecting hole, and an axial connecting groove is formed in one end, inserted into the chuck main body, of the output shaft;

the axial limiting piece is positioned inside the chuck main body and is connected with the chuck main body and the axial connecting groove;

the connecting hole is of a first shape on a first section, the connecting hole is of a second shape on a second section, and the first shape is the same as the shape of the axial connecting groove on the first section.

Compared with the prior art, the utility model has the beneficial effects that:

the electric tool and the electric tool chuck provided by the utility model can replace a key locking chuck in an angle drill type large-torque output tool, so that a user can replace an accessory more conveniently and quickly; compared with the threaded connection of a common hand-tightening chuck, the connecting hole has the first shape and the second shape, so that the connection is more reliable, and larger output torque can be borne.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

FIG. 1 is a schematic diagram of a power tool chuck according to an embodiment of the present invention;

FIG. 2 is a schematic view of a power tool according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2 according to an embodiment of the present invention;

fig. 4 is an exploded view of the power tool according to the embodiment of the present invention.

Reference numerals:

100. a chuck body;

101. a first connection hole; 102. a second connection hole; 103. a card and a portion; 104. a clamping jaw; 105. rotating the sleeve; 106. a locking wheel; 107. a first cross-section; 108. a second cross-section;

200. an output shaft;

201. a limiting base; 202. a limiting bump; 203. an axial connecting groove;

300. an axial stop.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The connecting hole is arranged at the bottom of the double flat position grooves, and the outer edge of the connecting hole is intersected with the clamping part. In the prior art, a drill body, a clamping jaw and a nut are arranged in an electric tool, and the nut is rotated to drive the clamping jaw to move forwards or backwards so as to clamp or release a drilling tool.

The electric tool often needs to frequently detach the working accessories in order to mount different working accessories, the chuck needs to be frequently operated because the working accessories are mounted on the chuck, and the chuck and the output shaft of the conventional electric drill are generally screwed by threads. The disadvantages of this fastening connection are: the device is only suitable for the working conditions of light load and small torque force; the connection of the collet to the output shaft is not sufficiently reliable. Another connection method for the chuck and the working accessory in the prior art is as follows: the chuck can be locked by an additional part, such as a key, so that the chuck is not convenient to use, and the additional part is easy to lose in the using process.

Example one

In order to solve the above technical problems in the prior art, as shown in fig. 1 to 4, the present embodiment provides an electric tool, which includes a chuck main body 100, an output shaft 200 and an axial limiting member 300, wherein the chuck main body 100 is used for clamping a workpiece, the output shaft 200 is used for transmitting torque to rotate the chuck main body 100, the output shaft 200 and the chuck main body 100 are connected and limited through a connecting hole, and an axial connecting groove 203 is formed at one end of the output shaft 200 inserted into the chuck main body 100. The axial stop member 300 is located inside the chuck body 100, and the axial stop member 300 connects the chuck body 100 and the axial connecting groove 203. The connection hole has a first shape in the first cross section 107 and a second shape in the second cross section 108, the first shape being the same as the shape of the axial connection groove 203 in the first cross section 107.

The first section 107 may be any section within the chuck body 100, and the first section 107 in this embodiment is perpendicular to the output shaft 200, which may be understood as a cross section of the chuck body 100. Specifically, the first cross-section 107 is a cross-section of the collet body 100 between the ends of the axial coupling slot 203. The shape of the connection hole in the first cross section 107 is the same as the shape of the axial connection groove 203 in the first cross section 107. The second cross section 108 may be any cross section external to the chuck body 100, with the second cross section 108 in this embodiment also being perpendicular to the output shaft 200.

Further, as shown in fig. 1, the connection holes include a first connection hole 101 and a second connection hole 102, and the first connection hole 101 is used to connect the head of the output shaft 200, i.e., the output shaft 200 is inserted into the first connection hole 101. Further, the first connection hole 101 has a first shape in the first cross section 107, the shape of the first connection hole 101 in the second cross section 108 and the shape of the second connection hole 102 in the second cross section 108 form a second shape, that is, the first connection hole 101 and the second connection hole 102 are communicated with each other in the second cross section 108.

Alternatively, the cartridge body 100 is provided at a rear end thereof with a card engaging portion 103, the first connection hole 101 penetrates the card engaging portion 103 in a direction of the output shaft 200 and at least partially penetrates the cartridge body 100, and the second connection hole 102 is provided in the card engaging portion 103. That is, the first connection hole 101 is a through hole inside the cartridge body 100, and the first connection hole 101 and the second connection hole 102 communicate at the engagement portion. Further, the second section 108 is located between a front end surface of the card and portion 103, which is connected to a rear end of the cartridge body 100, and a rear end surface, which is directed rearward of the cartridge body 100, and is perpendicular to the output shaft 200. Thus, the shape of the first connection hole 101 in the second cross section 108 and the shape of the second connection hole 102 in the second cross section 108 form a second shape.

Furthermore, the connecting hole can be of a double-flat structure or a single-flat structure. When the connecting holes are of a double-flat-position structure, the first connecting hole 101 is a flat-position hole, and the second connecting hole 102 is a quadrilateral hole or a flat-position hole; when the connection holes are of a single-flat structure, the first connection hole 101 is a circular hole or an elliptical hole, and the second connection hole 102 is a quadrangular hole or a flat hole. The connection holes in this embodiment are preferably of a single-flat structure, and specifically, the first connection holes 101 are circular holes, and the second connection holes 102 are flat holes.

Further, the second connection hole 102 is the same as the geometric center of the first connection hole 101, i.e., the first connection hole 101 and the second connection hole 102 are coaxially disposed. And the width of at least one side of the second connection hole 102 is greater than the diameter of the first connection hole 101, so that the output shaft 200 and the chuck body 100 are connected and limited through the connection hole.

In this embodiment, the output shaft 200 is provided with a limiting portion, and the limiting portion is connected to the second connecting hole 102. Under this structure, the head of output shaft 200 is connected spacingly with first connecting hole 101, and spacing portion on the output shaft 200 is connected spacingly with second connecting hole 102, realizes that output shaft 200 is spacing with being connected of chuck main body 100.

Specifically, as shown in fig. 4, the limiting portion includes a limiting base 201 and a limiting projection 202, the limiting base 201 abuts against the rear end face of the card portion 103, and the limiting projection 202 is disposed on the limiting base 201 and locked with the second connecting hole 102. With this structure, the limit protrusion 202 is inserted into the second connection hole 102, and is limited and locked by the sidewall of the second connection hole 102. Optionally, the limiting base 201 and the limiting projection 202 are integrally formed, so that the processing and the forming are convenient.

Optionally, the limiting base 201 is annular and is sleeved on the output shaft 200. Preferably, the limit base 201 and the output shaft 200 are integrally formed. Since the second connection hole 102 in this embodiment is a flat hole, the limiting protrusion 202 is adaptively configured as a rectangular protrusion, and two side edges of the rectangular protrusion abut against two opposite side walls of the second connection hole 102, it can be understood that, for convenience of processing, the outer circumferential surface of the limiting protrusion 202 is an arc surface and is coplanar with the outer circumferential surface of the limiting base 201.

In this embodiment, the chuck body 100 further includes a rotating sleeve 105 assembly and the plurality of jaws 104, the rotating sleeve 105 assembly being rotatable relative to the chuck body 100 to move the jaws 104 between a first position and a second position, the plurality of jaws 104 being fully retracted within the interior cavity of the chuck body 100 when the jaws 104 are moved to the first position, i.e., the spacing between the interior sides of the plurality of jaws 104 is minimized. When the jaws 104 are moved to the second position, the plurality of jaws 104 assume a fully open position with maximum spacing between the inner sides of the plurality of jaws 104.

Further, the rotating sleeve 105 assembly includes a rotating sleeve 105 and a locking wheel 106, wherein the rotating sleeve 105 is located outside the chuck body 100 and is rotationally connected with the chuck body 100; the locking wheel 106 is located inside the chuck body 100 and is fixedly connected to the rotating sleeve 105, the locking wheel 106 has an internal thread on the inside, and the jaws 104 have an external thread on the outside for engaging with the internal thread. Under the structure, a user rotates the rotating sleeve 105 to drive the locking wheel 106 to rotate synchronously, and the locking wheel 106 drives the clamping jaw 104 to move between the first position and the second position through threaded connection, so that the clamping jaw 104 is opened and contracted.

Further, when the clamping jaw 104 moves to the second position or a third position between the first position and the second position, the axial limiting member 300 is detachably connected with the axial connecting groove 203. It should be noted that, when the chuck is located at the third position, the interval between the inner sides of the plurality of clamping jaws 104 is greater than or equal to the diameter of the axial limiting member 300, so that the axial limiting member 300 is placed into the axial connecting groove 203 from the opening of the plurality of clamping jaws 104 at the third position. It will be appreciated that any position between the first position and the second position that satisfies the above definition may be the third position, i.e., the plurality of jaws 104 are not fully open when in the third position.

Optionally, the axial connecting groove 203 is a threaded hole, and the axial limiting member 300 is a screw, and the form of the screw and the threaded hole is simple and reliable.

Compared with the prior art, the electric tool provided by the embodiment enables a user to lock and unlock the chuck more conveniently and rapidly by arranging the rotating sleeve 105. The structure of this embodiment also allows the connection of the collet and the output shaft 200 to be completed while the collet is loosened. The fitting structure of the axial stopper 300 and the coupling hole ensures the reliability of the connection of the collet and the output shaft 200 in a high torque tool, making the collet body 100 more easily detachable from the output shaft 200, and at the same time, the connection structure of the collet and the output shaft 200 ensures the bearing of the torque to which the collet is subjected even when the working attachment is frequently replaced by using the rotary sleeve 105.

Example two

The embodiment provides an electric tool, which comprises a chuck main body 100, an output shaft 200 and an axial limiting member 300, wherein the chuck main body 100 is used for clamping a workpiece, the output shaft 200 is used for transmitting torque to enable the chuck main body 100 to rotate, the output shaft 200 and the chuck main body 100 are connected through a connecting hole for limiting, and one end, inserted into the chuck main body 100, of the output shaft 200 is provided with an axial connecting groove 203. The axial stop member 300 is located inside the chuck body 100, and the axial stop member 300 connects the chuck body 100 and the axial connecting groove 203. The connection hole has a first shape in the first cross section 107 and a second shape in the second cross section 108, the first shape being the same as the shape of the axial connection groove 203 in the first cross section 107.

Further, the second shape is a combined shape of the first shape and a third shape, the third shape penetrating the first shape. That is, the second shape includes a third shape and the first shape, and the third shape is divided into two by the first shape.

Specifically, the first section 107 may be any section inside the chuck body 100, and the first section 107 in the present embodiment is perpendicular to the output shaft 200, which may be understood as a cross section of the chuck body 100. The shape of the connection hole in the first cross section 107 is the same as the shape of the axial connection groove 203 in the first cross section 107. The second cross section 108 may be any cross section external to the chuck body 100, with the second cross section 108 in this embodiment also being perpendicular to the output shaft 200.

Further, the connection holes include a first connection hole 101 and a second connection hole 102, and the first connection hole 101 is used to connect the head of the output shaft 200, that is, the output shaft 200 is inserted into the first connection hole 101. Further, the first connection hole 101 has a first shape in the first cross section 107, the first connection hole 101 has the same shape as the first shape in the second cross section 108, the second connection hole 102 has a third shape in the second cross section 108, and the shape of the first connection hole 101 in the second cross section 108 and the third shape form the second shape, that is, the first connection hole 101 and the second connection hole 102 are communicated with each other in the second cross section 108.

Alternatively, the cartridge body 100 is provided at a rear end thereof with a card engaging portion 103, the first connection hole 101 penetrates the card engaging portion 103 in a direction of the output shaft 200 and at least partially penetrates the cartridge body 100, and the second connection hole 102 is provided in the card engaging portion 103. That is, the first connection hole 101 is a through hole inside the cartridge body 100, and the first connection hole 101 and the second connection hole 102 communicate at the engagement portion. Further, the second section 108 is located at the catch portion 103 and perpendicular to the output shaft 200, so that the shape of the first connection hole 101 at the second section 108 and the shape of the second connection hole 102 at the second section 108 form a second shape.

Furthermore, the connecting hole can be of a double-flat structure or a single-flat structure. When the connecting holes are of a double-flat-position structure, the first connecting hole 101 is a flat-position hole, and the second connecting hole 102 is a quadrilateral hole or a flat-position hole; when the connection holes are of a single-flat structure, the first connection hole 101 is a circular hole or an elliptical hole, and the second connection hole 102 is a quadrangular hole or a flat hole. The connection holes in this embodiment are preferably of a single-flat structure, and specifically, the first connection holes 101 are circular holes, and the second connection holes 102 are flat holes.

Further, the second connection hole 102 is the same as the geometric center of the first connection hole 101, i.e., the first connection hole 101 and the second connection hole 102 are coaxially disposed. And the width of at least one side of the second connection hole 102 is greater than the diameter of the first connection hole 101, so that the output shaft 200 and the chuck body 100 are connected and limited through the connection hole.

In this embodiment, the output shaft 200 is provided with a limiting portion, and the limiting portion is connected to the second connecting hole 102. Under this structure, the head of output shaft 200 is connected spacingly with first connecting hole 101, and spacing portion on the output shaft 200 is connected spacingly with second connecting hole 102, realizes that output shaft 200 is spacing with being connected of chuck main body 100.

Specifically, the limiting portion includes a limiting base 201 and a limiting projection 202, the limiting base 201 abuts against the rear end face of the card portion 103, and the limiting projection 202 is disposed on the limiting base 201 and locked with the second connecting hole 102. With this structure, the limit protrusion 202 is inserted into the second connection hole 102, and is limited and locked by the sidewall of the second connection hole 102. Optionally, the limiting base 201 and the limiting projection 202 are integrally formed, so that the processing and the forming are convenient.

Optionally, the limiting base 201 is annular and is sleeved on the output shaft 200. Preferably, the limit base 201 and the output shaft 200 are integrally formed. Since the second connection hole 102 in this embodiment is a flat hole, the limiting protrusion 202 is adaptively configured as a rectangular protrusion, and two side edges of the rectangular protrusion abut against two opposite side walls of the second connection hole 102, it can be understood that, for convenience of processing, the outer circumferential surface of the limiting protrusion 202 is an arc surface and is coplanar with the outer circumferential surface of the limiting base 201.

In this embodiment, the chuck body 100 further includes a rotating sleeve 105 assembly and the plurality of jaws 104, the rotating sleeve 105 assembly being rotatable relative to the chuck body 100 to move the jaws 104 between a first position and a second position, the plurality of jaws 104 being fully retracted within the interior cavity of the chuck body 100 when the jaws 104 are moved to the first position, i.e., the spacing between the interior sides of the plurality of jaws 104 is minimized. When the jaws 104 are moved to the second position, the plurality of jaws 104 assume a fully open position with maximum spacing between the inner sides of the plurality of jaws 104.

Further, the rotating sleeve 105 assembly includes a rotating sleeve 105 and a locking wheel 106, wherein the rotating sleeve 105 is located outside the chuck body 100 and is rotationally connected with the chuck body 100; the locking wheel 106 is located inside the chuck body 100 and is fixedly connected to the rotating sleeve 105, the locking wheel 106 has an internal thread on the inside, and the jaws 104 have an external thread on the outside for engaging with the internal thread. Under the structure, a user rotates the rotating sleeve 105 to drive the locking wheel 106 to rotate synchronously, and the locking wheel 106 drives the clamping jaw 104 to move between the first position and the second position through threaded connection, so that the clamping jaw 104 is opened and contracted.

Further, when the clamping jaw 104 moves to the second position or a third position between the first position and the second position, the axial limiting member 300 is detachably connected with the axial connecting groove 203. It should be noted that, when the chuck is located at the third position, the interval between the inner sides of the plurality of clamping jaws 104 is greater than or equal to the diameter of the axial limiting member 300, so that the axial limiting member 300 is placed into the axial connecting groove 203 from the opening of the plurality of clamping jaws 104 at the third position. It will be appreciated that any position between the first position and the second position that satisfies the above definition may be the third position, i.e., the plurality of jaws 104 are not fully open when in the third position.

Optionally, the axial connecting groove 203 is a threaded hole, and the axial limiting member 300 is a screw, and the form of the screw and the threaded hole is simple and reliable.

Compared with the prior art, the electric tool provided by the embodiment enables a user to lock and loosen the chuck more conveniently and rapidly by arranging the rotary sleeve. The structure of this embodiment can also complete the connection of the chuck and the output shaft while the chuck is loosened. The matching structure of the axial limiting part and the connecting hole ensures the connection reliability between the chuck and the output shaft of the large-torque tool, so that the chuck main body is easier to detach from the output shaft.

EXAMPLE III

The embodiment provides an electric tool chuck, which comprises a chuck main body 100 and an axial limiting member 300, wherein the chuck main body 100 is connected with an output shaft 200 of an electric tool and used for clamping a workpiece, the output shaft 200 is used for transmitting torque to enable the chuck main body 100 to rotate, the output shaft 200 and the chuck main body 100 are connected and limited through a connecting hole, and one end, inserted into the chuck main body 100, of the output shaft 200 is provided with an axial connecting groove 203. The axial stop member 300 is located inside the chuck body 100, and the axial stop member 300 connects the chuck body 100 and the axial connecting groove 203. The connection hole has a first shape in the first cross section 107 and a second shape in the second cross section 108, the first shape being the same as the shape of the axial connection groove 203 in the first cross section 107.

Specifically, the first section 107 may be any section inside the chuck body 100, and the first section 107 in the present embodiment is perpendicular to the output shaft 200, which may be understood as a cross section of the chuck body 100. The shape of the connection hole in the first cross section 107 is the same as the shape of the axial connection groove 203 in the first cross section 107. The second cross section 108 may be any cross section external to the chuck body 100, with the second cross section 108 in this embodiment also being perpendicular to the output shaft 200.

Further, the connection holes include a first connection hole 101 and a second connection hole 102, and the first connection hole 101 is used to connect the head of the output shaft 200, that is, the output shaft 200 is inserted into the first connection hole 101. Further, the first connection hole 101 has a first shape in the first cross section 107, the shape of the first connection hole 101 in the second cross section 108 and the shape of the second connection hole 102 in the second cross section 108 form a second shape, that is, the first connection hole 101 and the second connection hole 102 are communicated with each other in the second cross section 108.

Alternatively, the cartridge body 100 is provided at a rear end thereof with a card engaging portion 103, the first connection hole 101 penetrates the card engaging portion 103 in a direction of the output shaft 200 and at least partially penetrates the cartridge body 100, and the second connection hole 102 is provided in the card engaging portion 103. That is, the first connection hole 101 is a through hole inside the cartridge body 100, and the first connection hole 101 and the second connection hole 102 communicate at the engagement portion. Further, the second section 108 is located at the catch portion 103 and perpendicular to the output shaft 200, so that the shape of the first connection hole 101 at the second section 108 and the shape of the second connection hole 102 at the second section 108 form a second shape.

Furthermore, the connecting hole can be of a double-flat structure or a single-flat structure. When the connecting holes are of a double-flat-position structure, the first connecting hole 101 is a flat-position hole, and the second connecting hole 102 is a quadrilateral hole or a flat-position hole; when the connection holes are of a single-flat structure, the first connection hole 101 is a circular hole or an elliptical hole, and the second connection hole 102 is a quadrangular hole or a flat hole. The connection holes in this embodiment are preferably of a single-flat structure, and specifically, the first connection holes 101 are circular holes, and the second connection holes 102 are flat holes.

Further, the second connection hole 102 is the same as the geometric center of the first connection hole 101, i.e., the first connection hole 101 and the second connection hole 102 are coaxially disposed. And the width of at least one side of the second connection hole 102 is greater than the diameter of the first connection hole 101, so that the output shaft 200 and the chuck body 100 are connected and limited through the connection hole.

In this embodiment, the output shaft 200 is provided with a limiting portion, and the limiting portion is connected to the second connecting hole 102. Under this structure, the head of output shaft 200 is connected spacingly with first connecting hole 101, and spacing portion on the output shaft 200 is connected spacingly with second connecting hole 102, realizes that output shaft 200 is spacing with being connected of chuck main body 100.

Specifically, the limiting portion includes a limiting base 201 and a limiting projection 202, the limiting base 201 abuts against the rear end face of the card portion 103, and the limiting projection 202 is disposed on the limiting base 201 and locked with the second connecting hole 102. With this structure, the limit protrusion 202 is inserted into the second connection hole 102, and is limited and locked by the sidewall of the second connection hole 102. Optionally, the limiting base 201 and the limiting projection 202 are integrally formed, so that the processing and the forming are convenient.

Optionally, the limiting base 201 is annular and is sleeved on the output shaft 200. Preferably, the limit base 201 and the output shaft 200 are integrally formed. Since the second connection hole 102 in this embodiment is a flat hole, the limiting protrusion 202 is adaptively configured as a rectangular protrusion, and two side edges of the rectangular protrusion abut against two opposite side walls of the second connection hole 102, it can be understood that, for convenience of processing, the outer circumferential surface of the limiting protrusion 202 is an arc surface and is coplanar with the outer circumferential surface of the limiting base 201.

In this embodiment, the chuck body 100 further includes a rotating sleeve 105 assembly and the plurality of jaws 104, the rotating sleeve 105 assembly being rotatable relative to the chuck body 100 to move the jaws 104 between a first position and a second position, the plurality of jaws 104 being fully retracted within the interior cavity of the chuck body 100 when the jaws 104 are moved to the first position, i.e., the spacing between the interior sides of the plurality of jaws 104 is minimized. When the jaws 104 are moved to the second position, the plurality of jaws 104 assume a fully open position with maximum spacing between the inner sides of the plurality of jaws 104.

Further, the rotating sleeve 105 assembly includes a rotating sleeve 105 and a locking wheel 106, wherein the rotating sleeve 105 is located outside the chuck body 100 and is rotationally connected with the chuck body 100; the locking wheel 106 is located inside the chuck body 100 and is fixedly connected to the rotating sleeve 105, the locking wheel 106 has an internal thread on the inside, and the jaws 104 have an external thread on the outside for engaging with the internal thread. Under the structure, a user rotates the rotating sleeve 105 to drive the locking wheel 106 to rotate synchronously, and the locking wheel 106 drives the clamping jaw 104 to move between the first position and the second position through threaded connection, so that the clamping jaw 104 is opened and contracted.

Further, when the clamping jaw 104 moves to the second position or a third position between the first position and the second position, the axial limiting member 300 is detachably connected with the axial connecting groove 203. It should be noted that, when the chuck is located at the third position, the interval between the inner sides of the plurality of clamping jaws 104 is greater than or equal to the diameter of the axial limiting member 300, so that the axial limiting member 300 is placed into the axial connecting groove 203 from the opening of the plurality of clamping jaws 104 at the third position. It will be appreciated that any position between the first position and the second position that satisfies the above definition may be the third position, i.e., the plurality of jaws 104 are not fully open when in the third position.

Optionally, the axial connecting groove 203 is a threaded hole, and the axial limiting member 300 is a screw, and the form of the screw and the threaded hole is simple and reliable.

Compared with the prior art, the electric tool provided by the embodiment enables a user to lock and loosen the chuck more conveniently and rapidly by arranging the rotary sleeve. The structure of this embodiment can also complete the connection of the chuck and the output shaft while the chuck is loosened. The matching structure of the axial limiting part and the connecting hole ensures the connection reliability between the chuck and the output shaft of the large-torque tool, so that the chuck main body is easier to detach from the output shaft.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An electric power tool, characterized by comprising:

the chuck body is used for clamping a workpiece;

the output shaft is used for transmitting torque to enable the chuck main body to rotate, the output shaft and the chuck main body are connected and limited through a connecting hole, and an axial connecting groove is formed in one end, inserted into the chuck main body, of the output shaft;

the axial limiting piece is positioned inside the chuck main body and is connected with the chuck main body and the axial connecting groove;

the connecting hole is of a first shape on a first section, the connecting hole is of a second shape on a second section, and the first shape is the same as the shape of the axial connecting groove on the first section.

2. The power tool of claim 1, wherein the second shape is a combination of the first shape and a third shape that extends through the first shape.

3. The power tool according to claim 1, wherein the connection hole includes a first connection hole and a second connection hole, the first connection hole forming the second shape at the second section and the second connection hole at the second section; the chuck body rear end is equipped with card and portion, first connecting hole is followed the direction of output shaft runs through card and portion, and at least part passes the chuck body, the second connecting hole is located card and portion.

4. The power tool of claim 3, wherein the second connection hole has the same geometric center as the first connection hole, and at least one side of the second connection hole has a width greater than a diameter of the first connection hole.

5. The power tool of claim 4, wherein the output shaft is provided with a limiting portion, and the limiting portion is connected with the second connecting hole.

6. The power tool according to claim 5, wherein the stopper portion includes:

the limiting base is abutted against the rear end face of the clamping part;

and the limiting convex block is arranged on the limiting base and locked with the second connecting hole.

7. The power tool of claim 1, wherein the chuck body further comprises: a rotating sleeve assembly rotatable relative to the chuck body to move the jaws between a first position and a second position, the jaws moving to the second position with a maximum spacing between the inner sides of the jaws.

8. The power tool of claim 7, wherein the rotary sleeve assembly comprises:

the rotating sleeve is positioned outside the chuck body and is rotationally connected with the chuck body;

the locking wheel is located inside the chuck body and fixedly connected with the rotating sleeve, an internal thread is arranged on the inner side of the locking wheel, and an external thread meshed with the internal thread is arranged on the outer side of the clamping jaw.

9. The power tool of claim 7, wherein said axial stop member is removably coupled to said axial coupling slot when said jaw is moved to said second position or a third position between said first position and said second position; when the chuck is located at the third position, the interval between the inner sides of the clamping jaws is larger than or equal to the diameter of the axial limiting piece.

10. A power tool chuck, comprising:

the chuck body is connected with the output shaft and used for clamping a workpiece; the output shaft is used for transmitting torque to enable the chuck main body to rotate, the output shaft and the chuck main body are connected and limited through a connecting hole, and an axial connecting groove is formed in one end, inserted into the chuck main body, of the output shaft;

the axial limiting piece is positioned inside the chuck main body and is connected with the chuck main body and the axial connecting groove;

the connecting hole is of a first shape on a first section, the connecting hole is of a second shape on a second section, and the first shape is the same as the shape of the axial connecting groove on the first section.

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