CN217964826U - Drill chuck and power tool - Google Patents

Abstract

The present disclosure relates to the field of machining technology, and more particularly, to a drill chuck and a power tool. The drill chuck is characterized in that a plurality of clamping jaw grooves are formed in the front body, and the clamping jaw grooves are uniformly distributed around the axial direction of the front body, so that uniform force application of the clamping jaws to a drilling tool is facilitated after the clamping jaws are installed, stability and safety of the drilling tool in the using process are guaranteed, the guide directions of the clamping jaw grooves are arranged along the radial direction of the front body, so that the clamping jaws can directionally move under the driving of the rear body under the limitation of the corresponding clamping jaw grooves, and the clamping jaws move along the radial direction of the front body, so that the diameter range of the drilling tool for increasing the adaptation of the drill chuck is facilitated, the length of the clamping jaws is facilitated to be shortened, and the overall axial length of the drill chuck is facilitated to be reduced.

Description

Drill chuck and power tool

Technical Field

The present disclosure relates to the field of machining technology, and more particularly, to a drill chuck and a power tool.

Background

Drill chucks are indispensable fixtures for machining and power tools. The drill chuck is used as a clamp for holding a drilling tool (the drilling tool can be a drill bit, a screw tap and the like) to work in mechanical processing or electric tools. The drill chuck is generally small in size and specification, is convenient to detach from the power shaft, and is relatively low in cost compared with a large-scale clamp. The drill chuck mainly comprises three types, namely a hand-fastening drill chuck, a spanner drill chuck, a self-fastening drill chuck and the like; the inventor finds that the clamping jaw of the drill chuck drives the drill chuck through the rear body, so that the clamping jaw moves along the axial direction of the drill chuck, and the whole length of the drill chuck is longer; in addition, the drill chuck also limits the maximum diameter of a drilling tool which can be installed by the drill chuck, so that the diameter range of the drilling tool which is suitable for the drill chuck is smaller.

It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

The purpose of the disclosed embodiment is to provide a drill chuck and a power tool, aiming at solving the problem that the clamping jaw of the drill chuck discovered by the inventor is driven by a rear body more, so that the clamping jaw moves along the axial direction of the drill chuck, and the whole length of the drill chuck is longer; in addition, the drill chuck also limits the maximum diameter of a drill tool which can be installed on the drill chuck, so that the drill chuck is applicable to the technical problem of small diameter range of the drill tool.

In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows: there is provided a drill chuck comprising:

the clamping jaws are multiple in number;

the front body is provided with a plurality of clamping jaw grooves which are evenly distributed around the axis of the front body, the guiding directions of the clamping jaw grooves are arranged along a first direction, the first direction is perpendicular to the axis of the front body, and the clamping jaws are limited in the clamping jaw grooves in a sliding mode; and

a rear body for driving the jaws in a first direction in the jaw slots to enable the jaws to move away from or towards the axis of the front body.

Further, the drill chuck further comprises a clutch assembly configured to enable the relative fixation between the front body and the rear body or the relative rotation between the front body and the rear body.

Further, the first direction is parallel to a radial direction of the precursor body, and a guiding direction of the jaw groove is parallel to the radial direction of the precursor body; one end face of the clamping jaw is provided with a first plane thread, and one end face of the rear body is provided with a second plane thread matched with the first plane thread so that the clamping jaw can move along a first direction when the rear body rotates relative to the front body.

Further, the first plane threads are plane rectangular threads, and the second plane threads are plane rectangular threads.

Furthermore, the drill chuck further comprises an end cover, the end cover is fixedly connected with the end face of one end of the front body, the front body is provided with an axial accommodating hole, the rear body is limited in the axial accommodating hole through the end cover, the end cover is provided with a first through hole, and the other end, opposite to the rear body, of the rear body penetrates through the first through hole.

Further, the rear body is provided with a first shaft shoulder, a plurality of rolling bodies are arranged between the end face of the first shaft shoulder and the end face of the end cover, and the rolling bodies are located in the axial accommodating holes; at least one of an end surface of the first shoulder and an end surface of the end cap is in contact with the rolling body.

Furthermore, the jaw groove comprises a first limiting part, a second limiting part and a third limiting part which are sequentially communicated, the width of the axial section of the first limiting part is greater than that of the axial section of the second limiting part, and the width of the axial section of the second limiting part is less than that of the axial section of the third limiting part;

the clamping jaw comprises a first sub-part, a second sub-part and a third sub-part which are sequentially connected, the first sub-part is matched with the first limiting part, the second sub-part is matched with the second limiting part, and the third sub-part is matched with the third limiting part.

Further, the clutch assembly includes a first clutch configured to be rotatable in synchronization with the front body and a second clutch configured to be rotatable in synchronization with the rear body;

the first joint and the second joint have a joint state which enables the front body and the back body to keep relatively fixed;

the first joint and the second joint are separated from each other to enable relative rotation between the front body and the rear body.

Further, the first joint and the second joint are configured to be switched between the joint state and the separation state by decreasing or increasing a pitch.

Further, the first adapter is circumferentially fixed to the front body, the first adapter is axially fixed to the front body, the second adapter is circumferentially fixed to the back body, and the second adapter is axially movable along the back body.

Further, the first adapter is circumferentially fixed to the front body, the first adapter is movable in the axial direction of the front body, the second adapter is circumferentially fixed to the rear body, and the second adapter is axially fixed to the rear body.

Further, the drill chuck further comprises an elastic resetting piece, wherein the elastic resetting piece is configured to enable the first joint piece and the second joint piece to have a tendency of switching from the separation state to the joint state;

the first joint has an inner side and an outer side which are opposite, the second joint has an inner side and an outer side which are opposite, the inner side of the first joint is opposite to the inner side of the second joint, the surface of the inner side of the first joint is provided with a first tooth structure, and the surface of the inner side of the second joint is provided with a second tooth structure which is meshed with the first tooth structure;

the elastic resetting piece is positioned on the outer side of the first joint, or the elastic resetting piece is positioned on the outer side of the second joint.

Further, the drill chuck further comprises a clutch rotating sleeve, wherein the front body, the rear body and the clutch rotating sleeve are coaxially arranged, and the clutch rotating sleeve is configured to be capable of rotating relative to the rear body so as to change the distance between the first engaging piece and the second engaging piece.

Further, the surface of the inner side of the first joint also has a plurality of rolling grooves, and the groove depth of the rolling grooves is gradually increased from one end to the other end; the rolling groove accommodates a ball; the rotation of the clutch rotating sleeve can make the ball move between one end and the other end of the rolling groove in a reciprocating mode so as to enable the first engaging piece and the second engaging piece to be engaged or separated.

Further, a concave-convex limiting structure is arranged between the end cover and the first joint, so that the first joint moves axially relative to the end cover, and the first joint and the end cover are fixed in the circumferential direction, wherein the concave-convex limiting structure comprises: the first lug and the first groove are arranged on the end cover, and the second lug and the second groove are arranged on the first joint, the first lug extends into the second groove, and the second lug extends into the first groove.

Further, the periphery of the front body is provided with one emergency hole, or the periphery of the front body is symmetrically provided with a plurality of emergency holes.

The present disclosure also provides a power tool, comprising: the driving shaft and the drill chuck; the driving shaft is connected with the rear body and used for driving the rear body to rotate.

Furthermore, the end surface of the rear end of the rear body is provided with a mounting shaft hole or a handle-shaped structure; the mounting shaft hole is matched with the driving shaft or the handle-shaped structure is matched with the driving shaft so as to drive the drill chuck to rotate through the driving shaft.

Furthermore, the mounting shaft hole is a threaded hole or a hole with a polygonal cross section;

the handle-shaped structure is provided with external threads or the cross section of the handle-shaped structure is polygonal.

The utility model provides a drill chuck and power tool's beneficial effect mainly lies in:

according to the drill chuck, the front body is provided with the plurality of clamping jaw grooves which are uniformly distributed around the axis of the front body, so that uniform force application of the clamping jaws to a drill tool is facilitated after the clamping jaws are installed, the stability and the safety of the drill tool in the using process are ensured, the guide directions of the clamping jaw grooves are arranged along the radial direction of the front body, so that the clamping jaws can directionally move under the driving of the rear body under the limitation of the corresponding clamping jaw grooves, and the clamping jaws move along the radial direction of the front body, so that the diameter range of the drill tool for increasing the adaptation of the drill chuck is facilitated, the length of the clamping jaws is facilitated to be shortened, and the whole axial length of the drill chuck is facilitated to be reduced.

Drawings

To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural view (semi-sectional view) of a drill chuck in one or more embodiments of the present disclosure;

FIG. 2 is a schematic diagram of the structure of a precursor in one or more embodiments of the disclosure;

FIG. 3 is a top view of the precursor of FIG. 2;

FIG. 4 is a bottom view of the precursor of FIG. 2;

FIG. 5 is an axial cross-sectional view of a precursor body in one or more embodiments of the disclosure;

FIG. 6 is a schematic illustration (in cross-section) of the construction of the rear body in one or more embodiments of the present disclosure;

FIG. 7 is a top view of a rear body in one or more embodiments of the present disclosure;

FIG. 8 is a front view of a jaw in one or more embodiments of the present disclosure;

FIG. 9 is a left side view of the jaw of FIG. 8;

FIG. 10 is a bottom view of the jaws of FIG. 8;

fig. 11 is a schematic structural diagram of a first clutch in one or more embodiments of the present disclosure;

FIG. 12 is a cross-sectional view of a roller slot at a first joint in one or more embodiments of the present disclosure;

fig. 13 is a structural view of a second clutch in one or more embodiments of the present disclosure;

FIG. 14 is a schematic structural view of a clutch rotating sleeve in one or more embodiments of the present disclosure;

FIG. 15 is a schematic structural view from another perspective of a clutched rotating sleeve in one or more embodiments of the present disclosure;

FIG. 16 is another schematic structural view of a drill chuck in one or more embodiments of the present disclosure;

FIG. 17 is a schematic structural view of a back body of the drill chuck of FIG. 16;

FIG. 18 is a top view of the rear body of FIG. 17;

FIG. 19 is a schematic structural view of an end cap according to one or more embodiments of the present disclosure;

fig. 20 is another schematic structural view of the first joiner in one or more embodiments of the present disclosure;

fig. 21 is a top view of the first adapter of fig. 20;

fig. 22 is another schematic structural view of a second bond in one or more embodiments of the present disclosure;

fig. 23 is still another schematic view of the second jointer of fig. 22.

Reference numerals referred to in the above figures are detailed below:

100. a clamping jaw; 102. a jaw slot; 103. a precursor; 104. a rear body; 105. a first planar thread; 106. a second planar thread; 107. a first limiting part; 108. a second limiting part; 109. a third limiting part; 110. a first sub-section; 111. a second sub-section; 112. a third sub-section; 113. an end cap; 114. an axial receiving bore; 115. a drill receiving hole; 116. a first shoulder; 117. a second shoulder; 118. a rolling body; 119. a first jointer; 120. a second bond; 121. a first tooth structure; 122. a second tooth structure; 123. an elastic reset member; 124. a clutch rotating sleeve; 125. rolling a groove; 126. a ball bearing; 127. a bump structure; 128. a fourth via hole; 129. a rear top cover; 130. a spline; 131. a spline groove; 132. a clamp spring; 133. a limiting step; 134. a first bump; 135. a first groove; 136. a second bump; 137. a second groove; 138. a circular through hole; 139. an emergency hole; 200. and (5) installing the shaft hole.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings, which are used for convenience in describing and simplifying the disclosure, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the disclosure.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

In order to explain the technical solution of the present disclosure, the following detailed description is made with reference to the specific drawings and examples.

Referring to FIG. 1, in one or more embodiments, the present disclosure provides a drill chuck comprising: a jaw 100, a front body 103 and a rear body 104; the number of the clamping jaws is multiple; the front body 103 is provided with a plurality of clamping jaw grooves 102, the plurality of clamping jaw grooves 102 are uniformly distributed around the axis of the front body 103, namely the plurality of clamping jaw grooves are uniformly distributed around the circumference of the front body, the guiding direction of the clamping jaw grooves 102 is arranged along a first direction, the first direction is perpendicular to the axis of the front body, and the clamping jaws are limited in the clamping jaw grooves 102 in a sliding manner; the rear body 104 is used to drive the jaws in a first direction in the jaw slots 102 to enable the jaws to move away from or towards the axis of the front body 103.

According to the drill chuck provided by the disclosure, the front body 103 is provided with the plurality of clamping jaw grooves 102, and the plurality of clamping jaw grooves 102 are uniformly distributed around the axis of the front body 103, so that after the clamping jaws are installed, uniform force application of the clamping jaws to a drilling tool is facilitated, and the stability and the safety of the drilling tool in the using process are ensured. The guiding direction of the clamping jaw grooves 102 is arranged along the radial direction of the front body 103, so that the clamping jaws can directionally move under the limit of the clamping jaw grooves 102 under the driving of the rear body 104, the clamping jaws move along the radial direction of the front body 103, the diameter range of a drill tool matched with the drill chuck is favorably enlarged, the length of the clamping jaws is favorably shortened, and the axial length of the drill chuck is favorably reduced.

Referring to fig. 2 to 5, in some embodiments, the plurality of jaw slots 102 are arranged in one-to-one correspondence with the plurality of jaws, that is, the number of jaw slots 102 is equal to the number of jaws; a jaw is installed in a jaw slot 102; the jaw slot 102 is used for guiding the movement of the jaw, so that the jaw can move along the guiding direction of the jaw slot 102, namely the jaw moves along the radial direction of the front body 103; the plurality of clamping jaws can be driven by the rear body 104 to synchronously approach the axis of the front body 103 or synchronously depart from the axis of the front body 103, so that the plurality of clamping jaws can move away from each other to realize the loosening of the drilling tool or the plurality of clamping jaws can move close to each other to realize the clamping of the drilling tool. The rear body 104 rotates around the axis of the rear body 104 itself relative to the front body 103 to drive the plurality of jaws to move the plurality of jaws in the radial direction of the front body 103.

In one embodiment, the first direction is parallel to the radial direction of the front body, the guiding direction of the jaw slot 102 is arranged along the radial direction of the front body 103, and the rear body 104 is used for driving the jaws to move along the radial direction of the front body 103 in the jaw slot 102 so as to enable the jaws to move away from or close to the axis of the front body 103.

Referring to FIG. 1, in some embodiments, the drill chuck further includes a clutch assembly; the clutch assembly is configured to enable relative fixation between the front body 103 and the rear body 104 or relative rotation between the front body 103 and the rear body 104; when the clutch component enables the front body 103 and the rear body 104 to be relatively fixed, the locking of the drilling tool on the front body 103 is facilitated, the forward rotation and the reverse rotation of the drill chuck can be realized, and the drilling tool is not easy to loosen under the condition of the forward rotation and the reverse rotation of the drill chuck. In one embodiment, when the back body 104 rotates forward relative to the front body 103, the back body 104 realizes the clamping action of the clamping jaws on the drilling tool, and when the front body 103 and the back body 104 rotate forward simultaneously, the locking force of the clamping jaws on the drilling tool is increased, so that the drill chuck has a self-tightening function; the drilling tool is provided with a front end and a rear end which are opposite, the front end of the drilling tool processes objects to be processed, the rear end of the drilling tool is inserted into the drill chuck, the rear end of the drilling tool is clamped through a plurality of clamping jaws of the drill chuck, the drilling tool is detachably fixed on the drill chuck, and therefore the drilling tool and the drill chuck can rotate together. When the drill tool is installed on the drill chuck and is observed from the back end of the drill tool to the front end of the drill tool, the clockwise rotation direction of the drill chuck is the forward rotation direction of the drill chuck, and the anticlockwise rotation direction of the drill chuck is the reverse rotation direction of the drill chuck. When the rear body 104 rotates along the forward rotation direction of the drill chuck, the plurality of clamping jaws clamp the drilling tool; the rear body 104 is rotated in the reverse direction of the drill chuck to cause the plurality of jaws to perform a loosening operation on the drill. The bidirectional rotation of the drill chuck can be realized through the clutch combination, so that the drilling tool can work bidirectionally.

Referring to fig. 3 and 4, in one embodiment, the number of the jaw slots 102 is 3, and the corresponding central angle between two adjacent jaw slots 102 in the 3 jaw slots 102 is 60 degrees.

Referring to fig. 1 and 5, in some embodiments, the jaw slot 102 is oriented in a direction parallel to the radial direction of the front body 103; one end face of the clamping jaw is provided with a first plane thread 105, and one end face of the back body 104 is provided with a second plane thread 106 which is matched with the first plane thread 105 so as to enable the clamping jaw to move along the radial direction of the front body 103 when the back body 104 rotates relative to the front body 103. The jaws have opposite front and rear ends, with a first planar thread 105 on the end face of the rear end of the jaws. The rear body 104 has opposite front and rear ends, and the second planar thread 106 is located on the end face of the front end of the rear body 104. In one embodiment, the drill chuck has front and back directions of the components, and the drill is installed from the front end of the drill chuck. The first plane thread 105 on the clamping jaw is meshed with the second plane thread 106 on the back body 104, so that when the back body 104 rotates relative to the front body 103, the rotation of the back body 104 is converted into the linear motion of the clamping jaw along the clamping jaw groove 102 through the first plane thread 105 and the second plane thread 106; the first plane threads 105 are plane rectangular threads, the second plane threads 106 are plane rectangular threads, conversion between rotary motion and linear motion can be well achieved through the plane rectangular threads, and transmission efficiency is improved.

Referring to fig. 1, in some embodiments, the jaw slot 102 includes a first limiting portion 107, a second limiting portion 108 and a third limiting portion 109 which are sequentially communicated, the width of the axial cross section of the first limiting portion 107 is greater than that of the axial cross section of the second limiting portion 108, and the width of the axial cross section of the second limiting portion 108 is less than that of the axial cross section of the third limiting portion 109; the clamping jaw comprises a first sub-part 110, a second sub-part 111 and a third sub-part 112 which are connected in sequence, wherein the first sub-part 110 is matched with the first limiting part 107, the second sub-part 111 is matched with the second limiting part 108, and the third sub-part 112 is matched with the third limiting part 109. Through the design of the clamping jaw grooves 102 and the clamping jaws, the clamping jaws are limited on the clamping jaw grooves 102, the clamping jaws are guaranteed to move along the radial direction of the front body 103, and the clamping jaws are not prone to shaking in the clamping jaw grooves 102.

Referring to fig. 1, in some embodiments, the drill chuck further includes an end cap 113, the end cap 113 is fixedly connected to an end surface of one end of the front body 103, the front body 103 has an axial receiving hole 114, the rear body 104 is retained in the axial receiving hole 114 by the end cap 113, the end cap 113 has a first through hole, and the opposite end of the rear body 104 passes through the first through hole. The front body 103 also has a drill receiving hole 115 connected to the axial receiving hole 114 for insertion of a drill and clamping of the drill by the jaws. The front body 103 has an axial receiving hole 114 and a drill receiving hole 115 in this order from the rear end to the front end of the front body 103. A stepped surface is formed between the axial receiving hole 114 and the drill receiving hole 115 to limit the rear body 104, so that the rear body 104 is limited on the front body 103 by the cooperation of the stepped surface of the front body 103 and the end cover 113.

In one embodiment, the end cap 113 is detachably and fixedly connected to the end surface of the rear end of the front body 103 by screws.

Referring to fig. 6, in some embodiments, the rear body 104 has a first shoulder 116, a plurality of rolling elements 118 are disposed between an end face of the first shoulder 116 and an end face of the end cap 113, and the rolling elements 118 are located in the axial receiving holes 114; at least one of the end surface of the first shoulder 116 and the end surface of the end cap 113 is in contact with the rolling bodies 118. The rolling bodies 118 are arranged to facilitate the rotation of the rear body 104 relative to the front body 103, and the rear body 104 is axially fixed to the front body 103 under the cooperation of the end caps 113 and the rolling bodies 118, that is, the rear body 104 does not move axially relative to the front body 103, but the rear body 104 can rotate relative to the front body 103.

Referring to fig. 1, in one embodiment, the rolling elements 118 are balls, and the material of the balls is steel, that is, the rolling elements 118 are steel balls; the end face of the first shoulder 116 and the end face of the end cap 113 are in contact with the uniform rolling elements 118.

It should be noted that in some other embodiments, the rolling elements 118 may also be needles, which are needle rollers in a needle bearing. In some other embodiments, a plurality of rolling elements 118 may be mounted on a cage to provide spacing between the plurality of rolling elements 118, the plurality of rolling elements 118 and the cage forming a thrust bearing.

Referring to fig. 1, 11, 13 and 13, in some embodiments, the clutch assembly includes a first clutch 119 and a second clutch 120, the first clutch 119 configured to rotate synchronously with the front body 103 and the second clutch 120 configured to rotate synchronously with the rear body 104; the first joint 119 and the second joint 120 have a joint state that enables the front body 103 and the rear body 104 to be relatively fixed; the first joint 119 and the second joint 120 are also separated from each other so that the front body 103 and the rear body 104 can rotate relative to each other. The connection or disconnection between the back body 104 and the front body 103 is realized through the first connector 119 and the second connector 120, namely when the first connector 119 is connected with the second connector 120, the back body 104 and the front body 103 can synchronously rotate to realize the bidirectional rotation of the drill chuck, and when the first connector 119 is disconnected with the second connector 120, the back body 104 can rotate relative to the front body 103, thereby realizing the clamping or releasing of the drill by the back body 104 driving the clamping jaws.

In some embodiments, the first joint 119 and the second joint 120 are configured to be switched between the joint state and the separation state by decreasing or increasing the distance, and when the distance between the first joint 119 and the second joint 120 decreases to a first set value, the first joint 119 is joined to the second joint 120; when the distance between the first joint 119 and the second joint 120 gradually increases, that is, when the distance is greater than or equal to the second set value, the first joint 119 and the second joint 120 are separated, that is, disconnected.

Referring to fig. 1, in some embodiments, first adapter 119 is circumferentially fixed to front body 103, first adapter 119 is axially fixed to front body 103, second adapter 120 is circumferentially fixed to rear body 104, and second adapter 120 is axially movable along rear body 104 such that a change in the distance between first adapter 119 and the second adapter 120 is achieved by axial movement of second adapter 120 relative to rear body 104 along rear body 104 to effect engagement or disengagement between first adapter 119 and second adapter 120. In one embodiment, the first adapter 119 is screwed to the front body 103 together with the end cap 113. The second joint sub 120 has a second through hole, the hole wall of the second through hole has a spline, the back body 104 has a spline groove 131 matching with the spline 130 on the second joint sub 120, the second joint sub 120 is sleeved on the back body 104, thus the circumferential fixation between the second joint sub 120 and the back body 104 is realized through the matching of the spline and the spline groove 131, and the second joint sub 120 can move along the axial direction of the back body 104.

It should be noted that in some other embodiments, the first adapter 119 is integrated with the end cap 113; in other embodiments, the first adapter 119, the end cap 113 and the front body 103 are of a unitary structure. In some other embodiments, the second through hole is a kidney-shaped hole, and the rear body 104 has a cross-sectional shape matching the kidney-shaped hole, so that the second joint member 120 can move along the axial direction of the rear body 104.

Referring to fig. 16, 17, 18, 19, and 20, in some other embodiments, the first adapter 119 is circumferentially fixed with the front body 103, the first adapter 119 is capable of moving in the axial direction of the front body 103, the second adapter 120 is circumferentially fixed with the back body 104, and the second adapter 120 is axially fixed with the back body 104. A concave-convex limiting structure is arranged between the end cover and the first joint, so that the first joint moves axially relative to the end cover, and the first joint and the end cover are circumferentially fixed; wherein, unsmooth limit structure includes: the end cover comprises a first lug 134 and a first groove 135 which are arranged on the end cover, and a second lug 136 and a second groove 137 which are arranged on the first joint, wherein the first lug extends into the second groove, the second lug extends into the first groove, one surface of the end cover facing the first joint is provided with a plurality of first lugs extending along the axial direction of the end cover, the first lugs are uniformly arranged at intervals along the circumferential direction of a set circle, the center of the set circle is concentric with the center of the end cover, and a first groove is formed between two adjacent first lugs. The outer side of the first joint is provided with a plurality of second lugs extending along the axial direction of the first joint, the second lugs are uniformly arranged at intervals along the circumferential direction of a set circle, the center of the set circle is concentric with the center of the first joint, and a second groove is formed between every two adjacent second lugs; the first adapter is coaxially disposed with the end cap. The first adapter and the end cap are provided with smooth circular through holes 138 for the back body to pass through.

Referring to fig. 1, in some embodiments, the drill chuck further comprises an elastic reset member 123, the elastic reset member 123 is configured to have a tendency to switch from a separated state to an engaged state between the first engaging member 119 and the second engaging member 120; the first joint element 119 has opposite inner and outer sides, the second joint element 120 has opposite inner and outer sides, the inner side of the first joint element 119 is opposite to the inner side of the second joint element 120, and the surface of the inner side of the first joint element 119 has a first tooth structure 121, and the surface of the inner side of the second joint element 120 has a second tooth structure 122 engaged with the first tooth structure 121; the first tooth structure 121 and the second tooth structure 122 may be in the form of face teeth, such that when the first tooth structure 121 is engaged with the second tooth structure 122, an engaged state between the first engaging sub 119 and the second engaging sub 120 is achieved, and when the first tooth structure 121 is completely separated from the second tooth structure 122, a separated state between the first engaging sub 119 and the second engaging sub 120 is achieved.

Referring to fig. 1, in some embodiments, the elastic restoring member 123 is located at an outer side of the second engaging member 120. The elastic restoring member 123 is sleeved on the rear body 104. The elastic restoring member 123 is a wave spring.

Referring to fig. 16, in some other embodiments, the elastic restoring member 123 is positioned outside the first engaging member 119. Specifically, the elastic restoring element 123 is located between the first engaging element 119 and the end cap 113, and the elastic restoring element is sleeved on the rear body. When the end cover and the first joint are circumferentially fixed through the concave-convex limiting structure and can move along the axial direction of the precursor, the first convex block still extends into the second groove and the second convex block still extends into the first groove when the elastic resetting piece separates the first joint from the second joint.

In some embodiments, the drill chuck further comprises a clutch collar 124, the front body 103, the rear body 104 and the clutch collar 124 being coaxially arranged, the clutch collar 124 being configured to be rotatable relative to the rear body 104 to vary the spacing between the first clutch 119 and the second clutch 120.

Referring to fig. 11, 12, 15, 20 and 21, in some embodiments, the surface of the inner side of the first joint 119 further has a plurality of rolling grooves 125, and the plurality of rolling grooves 125 are uniformly arranged around a circle having a center passing through the center of the first joint 119 on the surface of the inner side of the first joint 119. The first joint 119 and the second joint 120 are both sheet-shaped. The groove depth of the rolling groove 125 gradually increases from one end to the other end. The direction of the groove depth is parallel to the axial direction of the rear body 104. The rolling groove 125 accommodates the ball 126 such that the ball 126 is positioned between the first clutch 119 and the second clutch 120, the first clutch 119 is engaged with the second clutch 120 when the ball 126 is positioned at the deepest portion of the rolling groove 125, the ball 126 makes the distance between the first clutch 119 and the second clutch 120 gradually increase when the ball 126 moves from the other end of the rolling groove 125 to one end of the rolling groove 125, and the first tooth structure 121 is not engaged with the second tooth structure 122 when the distance between the second clutch 120 and the first clutch 119 is greater than or equal to a second set value, thereby achieving the separation between the first clutch 119 and the second clutch 120. The inner wall of the clutch rotating sleeve 124 is provided with a plurality of lug structures 127 which protrude along the radial direction of the clutch rotating sleeve 124, each lug structure is provided with a fourth through hole 128, the number of the lug structures is equal to the number of the rolling grooves 125, and the number of the rolling grooves 125 is equal to the number of the balls 126. The ball 126 is limited in the fourth through hole 128, and the axial height of the ball 126 is greater than that of the bump structure, which facilitates the change of the distance between the first adapter 119 and the second adapter 120 by the ball 126. The rotation of the clutch-rotating sleeve 124 drives the balls 126 to move in the rolling grooves 125, so that the balls 126 reciprocate between one end and the other end of the rolling grooves 125, thereby achieving engagement or disengagement between the first clutch 119 and the second clutch 120. When the clutch rotating sleeve 124 rotates along the forward rotation direction of the drill chuck, the first engaging piece 119 is separated from the second engaging piece 120, and when the clutch rotating sleeve 124 rotates along the reverse rotation direction of the drill chuck, the first engaging piece 119 is engaged with the second engaging piece 120.

Referring to fig. 1, in one embodiment, the balls 126 are formed in a spherical shape, and the rolling grooves 125 are formed in a substantially drop shape when viewed from the inside of the first clutch 119 to the outside of the first clutch 119, which facilitates the separation between the first clutch 119 and the second clutch 120 by the balls 126. Alternatively, the number of the rolling grooves 125 is 3, and the number of the balls 126 is 3. It should be noted that in some other embodiments, the balls 126 may also be conical or frustoconical.

Referring to fig. 1, in some embodiments, the drill bit further comprises a rear cap 129, the rear cap 129 has a third through hole, the rear body 104 has a second shoulder 117, the second shoulder 117 is near the rear end of the rear body 104, the rear cap 129 is retained on the rear body 104 by the second shoulder 117, the third through hole is a kidney-shaped hole, and a portion of the rear end of the rear body 104 has a cross section which is similar to the kidney-shaped hole, so that the rear body 104 and the rear cap 129 are circumferentially fixed. The rear body 104 is further provided with a clamping groove, a clamping spring 132 is installed in the clamping groove, so that the rear top cover 129 is located between the clamping spring 132 and the elastic reset piece 123, and the second joint 120 is located between the first joint 119 and the elastic reset piece 123. The first joint 119 is located between the end cap 113 and the second joint 120.

Referring to fig. 16, 17, 22 and 23, in some other embodiments, when the first adapter 119 is fixed circumferentially to the front body 103, the first adapter 119 is able to move axially along the front body 103, the second adapter 120 is fixed circumferentially to the back body 104, and the second adapter 120 is fixed axially to the back body 104, the second adapter has a kidney-shaped hole, the back body has a cross section that is contoured to the kidney-shaped hole on the second adapter, so that the back body is fixed circumferentially to the second adapter, and at the same time, the second adapter is retained by the second shoulder 117 on the back body, and the back cap is fixed circumferentially to the back body; the rear top cover 129 and the second adapter are axially limited on the rear body by a clamp spring 132 and a second shoulder, so that the second adapter is axially fixed relative to the rear body. When the clutch rotating sleeve 124 is rotated, the balls 126 are driven to move in the rolling grooves 125, so that the balls 126 reciprocate between one end and the other end of the rolling grooves 125, and thus the first clutch moves along the axial direction of the front body, so as to overcome the force of the elastic resetting member or under the action of the elastic resetting member, so that the first clutch moves relative to the end cover, so as to separate or join the first clutch from the second clutch, and when the distance between the first clutch and the end cover is reduced by overcoming the force of the elastic resetting member, the first clutch and the second clutch are separated, and similarly, under the action of the elastic resetting member, the distance between the first clutch and the end cover can be reduced, so that the first clutch and the second clutch are joined.

Referring to fig. 14, in some examples, the clutch rotating sleeve 124 has limiting steps 133 at both ends of the inner wall, so that the rear top cover 129 abuts against the step surface of one limiting step 133, so that the end surface of the rear end of the front body 103 abuts against the step surface of the other limiting step 133, thereby axially fixing the clutch rotating sleeve 124, and the clutch rotating sleeve 124 can rotate around the rear body 104 in the axial direction relative to the rear body 104.

Referring to fig. 1, fig. 2 and fig. 16, in some embodiments, the front body has one emergency hole 139 in the circumferential direction or a plurality of emergency holes are symmetrically arranged, and the drill chuck is clamped or loosened by a screwdriver or a hook wrench extending into the emergency holes. After the emergency hole is formed, the initial clamping force of the drill chuck can be increased, and the drill chuck can be loosened under the action of the round-handle screwdriver.

In one or more embodiments, the present disclosure also provides a power tool including: a drive shaft and a drill chuck in any embodiment; the drive shaft is connected to the rear body 104 for driving the rear body 104 to rotate. The rear end of the rear body 104 has a mounting shaft hole at its end surface, which is engaged with a driving shaft for driving the rear body 104 to rotate, and when the first engaging member 119 is engaged with the second engaging member 120, the rear body 104 and the front body 103 are rotated synchronously. The mounting shaft hole 200 is a hole or a threaded hole having a polygonal cross section, and the driving shaft is mounted in the mounting shaft hole. It should be noted that, in some other embodiments, the rear end of the rear body may have a handle-like structure with an external thread or a handle-like structure with a polygonal cross section, so as to cooperate with the driving shaft to drive the drill chuck to rotate.

The above description is intended only to serve as an alternative embodiment of the disclosure, and not as a limitation on the disclosure, and any modification, equivalent replacement, and improvement made within the spirit and principle of the disclosure should be included in the scope of the disclosure.

Claims (19)

1. A drill chuck, comprising:

the clamping jaws are multiple in number;

the front body is provided with a plurality of clamping jaw grooves which are evenly distributed around the axis of the front body, the guiding directions of the clamping jaw grooves are arranged along a first direction, the first direction is perpendicular to the axis of the front body, and the clamping jaws are limited in the clamping jaw grooves in a sliding mode; and

a rear body for driving the jaws in a first direction in the jaw slots to enable the jaws to move away from or towards the axis of the front body.

2. The drill chuck according to claim 1, further comprising a clutch assembly configured to enable relative fixation between the front body and the back body or relative rotation between the front body and the back body.

3. The drill chuck according to claim 2, wherein the first direction is parallel to a radial direction of the precursor body, and the direction of the guiding of the clamping jaw groove is parallel to the radial direction of the precursor body; one end face of the clamping jaw is provided with a first plane thread, and one end face of the rear body is provided with a second plane thread matched with the first plane thread so that the clamping jaw can move along a first direction when the rear body rotates relative to the front body.

4. The drill chuck according to claim 3, wherein the first planar threads are planar rectangular threads and the second planar threads are planar rectangular threads.

5. The drill chuck according to claim 1, further comprising an end cap fixedly coupled to an end face of one end of the front body, the front body having an axial receiving hole, the rear body being retained in the axial receiving hole by the end cap, the end cap having a first through hole, the opposite end of the rear body passing through the first through hole.

6. The drill chuck according to claim 5, wherein the back body has a first shoulder, a plurality of rolling elements are disposed between an end face of the first shoulder and an end face of the end cap, and the rolling elements are located in the axial receiving hole; at least one of an end surface of the first shoulder and an end surface of the end cap is in contact with the rolling body.

7. The drill chuck according to claim 1, wherein the jaw groove includes a first stopper portion, a second stopper portion and a third stopper portion which are sequentially communicated, a width of an axial cross section of the first stopper portion is greater than a width of an axial cross section of the second stopper portion, and a width of an axial cross section of the second stopper portion is less than a width of an axial cross section of the third stopper portion;

the clamping jaw comprises a first sub-part, a second sub-part and a third sub-part which are sequentially connected, the first sub-part is matched with the first limiting part, the second sub-part is matched with the second limiting part, and the third sub-part is matched with the third limiting part.

8. The drill chuck according to claim 2, wherein the clutch assembly includes a first clutch configured to be capable of rotating synchronously with the front body and a second clutch configured to be capable of rotating synchronously with the rear body;

the first joint and the second joint have a joint state which enables the front body and the back body to keep relatively fixed;

the first joint and the second joint are also in a separated state which enables the front body and the rear body to rotate relatively.

9. The drill chuck according to claim 8, wherein the first engaging member and the second engaging member are configured to be switched between the engaged state and the disengaged state by decreasing a pitch or increasing a pitch.

10. The drill chuck according to claim 9, wherein the first clutch is circumferentially fixed with the front body, the first clutch is axially fixed with the front body, the second clutch is circumferentially fixed with the back body, and the second clutch is axially movable along the back body.

11. The drill chuck according to claim 9, wherein the first engager is circumferentially fixed with the front body, the first engager is movable in an axial direction of the front body, the second engager is circumferentially fixed with the back body, and the second engager is axially fixed with the back body.

12. The drill chuck according to claim 10 or 11, further comprising an elastic return member configured to have a tendency to switch between the first and second engagers from the disengaged state to the engaged state;

the first joint has an inner side and an outer side which are opposite, the second joint has an inner side and an outer side which are opposite, the inner side of the first joint is opposite to the inner side of the second joint, the surface of the inner side of the first joint is provided with a first tooth structure, and the surface of the inner side of the second joint is provided with a second tooth structure which is meshed with the first tooth structure;

the elastic resetting piece is positioned on the outer side of the first joint, or the elastic resetting piece is positioned on the outer side of the second joint.

13. The drill chuck according to claim 9, further comprising a clutch rotating sleeve, the front body, the rear body and the clutch rotating sleeve being coaxially disposed, the clutch rotating sleeve being configured to be rotatable relative to the rear body to change a spacing between the first clutch and the second clutch.

14. The drill chuck according to claim 13, wherein the inner side surface of the first adapter further has a plurality of rolling grooves, the groove depth of the rolling grooves gradually increasing from one end to the other end; the rolling groove accommodates a ball; the rotation of the clutch rotating sleeve can make the ball move between one end and the other end of the rolling groove in a reciprocating mode, so that the first clutch and the second clutch are connected or separated.

15. The drill chuck according to claim 5 or 6, wherein the end cap and the first adapter have a positive and negative limiting structure therebetween such that the first adapter moves axially relative to the end cap and the first adapter and the end cap are fixed circumferentially therebetween, wherein the positive and negative limiting structure comprises: the first lug and the first groove are arranged on the end cover, and the second lug and the second groove are arranged on the first joint.

16. The drill chuck according to claim 11, wherein the precursor body has one emergency hole in a circumferential direction thereof, or a plurality of emergency holes are symmetrically arranged in the circumferential direction thereof.

17. A power tool, comprising: a drive shaft and a drill chuck according to any one of claims 1-16; the driving shaft is connected with the rear body and used for driving the rear body to rotate.

18. The power tool of claim 17, wherein the end face of the rear end of the rear body has a mounting shaft hole or a shank-like structure; the mounting shaft hole is matched with the driving shaft or the handle-shaped structure is matched with the driving shaft so as to drive the drill chuck to rotate through the driving shaft.

19. The power tool of claim 18, wherein said mounting socket is a threaded hole or a hole having a polygonal cross-section;

the handle-shaped structure is provided with external threads or the cross section of the handle-shaped structure is polygonal.

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