WO2024036484A1

WO2024036484A1 - Drill chuck and power tool

Info

Publication number: WO2024036484A1
Application number: PCT/CN2022/112813
Authority: WO
Inventors: 柳尧亭
Original assignee: 福比特精工科技有限公司
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2024-02-22

Abstract

A drill chuck and a power tool. In the drill chuck, a front body is provided with a plurality of clamping jaw grooves (102), and the plurality of clamping jaw grooves are uniformly distributed in an axial direction of the front body (103), such that after clamping jaws (100) are installed, the clamping jaws can easily apply uniform force to a drilling tool, thereby ensuring the stability and safety in the process of using the drilling tool. The directions of the guiding of the clamping jaw grooves are radially set along the front body, such that the plurality of clamping jaws can be driven by a rear body (104) to directionally move under the limitation of the corresponding clamping jaw grooves, and radial movement of the clamping jaws along the front body is conducive to widening the range of diameter of the drilling tool that matches the drill chuck and shortening the lengths of the clamping jaws, and thus helps to reduce the overall axial length of the drill chuck.

Description

Drill chucks and power tools

Technical field

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

Background technique

Drill chuck is an indispensable fixture for machining and power tools. The function of the drill chuck is to serve as a fixture to hold drilling tools (drilling tools can be drill bits, taps, etc.) during mechanical processing or power tools. The size of the drill chuck is generally small, which is easy to disassemble from the power shaft, and its cost is relatively low compared with large clamps. There are three main types of drill chucks, namely hand-tightening drill chucks, wrench drill chucks, and self-tightening drill chucks. The inventor found that the jaws of a drill chuck are mostly driven through the rear body, so that the jaws move along the drill chuck. The axial movement of the head makes the overall length of the drill chuck longer; in addition, it also limits the maximum diameter of the drill tools that the drill chuck can be installed, making the diameter range of the drill tools suitable for the drill chuck smaller.

It should be noted that the information disclosed in the above background section is only used to enhance understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to those of ordinary skill in the art.

technical problem

The purpose of the disclosed embodiments is to provide a drill chuck and a power tool, aiming to solve the problem discovered by the inventor that the clamping jaws of the drill chuck are mostly driven through the rear body, so that the clamping jaws move along the axial direction of the drill chuck. , which makes the overall length of the drill chuck longer; in addition, it also limits the maximum diameter of the drill tools that the drill chuck can be installed, making the drill chuck suitable for a smaller diameter range of drill tools.

Technical solutions

The technical solution adopted by this disclosure is to provide a drill chuck, which includes:

Clamps, the number of the clamps is multiple;

The precursor is provided with a plurality of clamping claw grooves, the plurality of clamping claw grooves are evenly distributed around the axis of the precursor, the guiding direction of the clamping claw grooves is arranged along the first direction, and the first The direction is perpendicular to the axis of the front body, and the jaw sliding is limited in the jaw groove; and

The rear body is used to drive the clamping jaw to move in the first direction in the clamping jaw slot so that the clamping jaw can move away from or approach the axis of the front body.

Further, the drill chuck further includes a clutch assembly, and the clutch assembly is configured to maintain a relative fixation between the front body and the rear body or to maintain a relative fixation between the front body and the rear body. capable of relative rotation.

Further, the first direction is parallel to the radial direction of the precursor, and the guide direction of the clamping claw groove is parallel to the radial direction of the precursor; one end surface of the clamping claw has a first plane thread, One end surface of the rear body has a second plane thread that matches the first plane thread, so that when the rear body rotates relative to the front body, the clamping jaw can move in the first direction.

Further, the first plane thread is a plane rectangular thread, and the second plane thread is a plane rectangular thread.

Further, the drill chuck further includes an end cover, the end cover is fixedly connected to the end surface of one end of the front body, the front body has an axial receiving hole, and the rear body is limited by the end cover. Located in the axial receiving hole, the end cap has a first through hole, and the opposite end of the rear body passes through the first through hole.

Further, the rear body has a first shoulder, a plurality of rolling elements are provided between the end surface of the first shoulder and the end surface of the end cover, and the rolling elements are located in the axial receiving hole. ; At least one of the end surface of the first shoulder and the end surface of the end cap is in contact with the rolling element.

Further, the clamping claw groove includes a first limiting part, a second limiting part and a third limiting part that are connected in sequence, and the width of the axial cross-section of the first limiting part is greater than that of the second limiting part. The width of the axial cross-section of the second limiting part is smaller than the width of the axial cross-section of the third limiting part;

The clamping jaw includes a first sub-part, a second sub-part and a third sub-part that are connected in sequence. The first sub-part is adapted to the first limiting part, and the second sub-part is adapted to the first limiting part. The second limiting part is adapted to fit, and the third sub-part is adapted to the third limiting part.

Further, the clutch assembly includes a first joint and a second joint, the first joint is configured to rotate synchronously with the front body, and the second joint is configured to rotate with the rear body. The body rotates synchronously;

The first joint and the second joint have a joint state that enables the front body and the rear body to maintain a relatively fixed joint state;

The first joint and the second joint also have a separation state that enables relative rotation between the front body and the rear body.

Further, the first joint and the second joint are configured to achieve switching between the engaged state and the separated state by reducing the spacing or increasing the spacing.

Further, the first joint is circumferentially fixed to the front body, the first joint is axially fixed to the front body, the second joint is circumferentially fixed to the rear body, and the The second joint is axially movable along the rear body.

Further, the first joint is circumferentially fixed to the front body, the first joint is movable along the axial direction of the front body, and the second joint is circumferentially fixed to the rear body, And the second connector is axially fixed to the rear body.

Further, the drill chuck further includes an elastic return member, and the elastic return member is configured to allow the first joint member and the second joint member to move from the separated state to the engaged state. Switching tendencies;

The first joint has an opposite inner side and an outer side, the second joint has an opposite inner side and an outer side, the inner side of the first joint is opposite to the inner side of the second joint, and the first joint has an inner side opposite to an inner side of the second joint. The inner surface of the joint has a first tooth structure, and the inner surface of the second joint has a second tooth structure that meshes with the first tooth structure;

The elastic return component is located outside the first joint, or the elastic return component is located outside the second joint.

Further, the drill chuck further includes a clutch rotating sleeve, the front body, the rear body and the clutch rotating sleeve are coaxially arranged, and the clutch rotating sleeve is configured to be able to rotate relative to the rear body. , to change the distance between the first joint and the second joint.

Further, the inner surface of the first joint also has a plurality of rolling grooves, the depth of the rolling grooves gradually increases from one end to the other end; the rolling grooves accommodate balls; and the clutch rotation sleeve The rotation can cause the ball to reciprocate between one end and the other end of the rolling groove, so that the first joint and the second joint are engaged or separated.

Further, there is a concave and convex limiting structure between the end cap and the first joint, so that the first joint can move axially relative to the end cap, and there is a gap between the first joint and the end cap. Circumferentially fixed, wherein the concave and convex limiting structure includes: a first convex block and a first groove provided on the end cover, and a second convex block and a second groove provided on the first joint, so The first protruding block extends into the second groove, and the second protruding block extends into the first groove.

Further, the precursor has one emergency hole in its circumferential direction, or multiple emergency holes are symmetrically arranged in the circumferential direction of the precursor.

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

Further, the end surface of the rear end of the rear body has a mounting shaft hole or a handle-like structure; the installation shaft hole matches the driving shaft or the handle-like structure matches the driving shaft to drive the vehicle through the driving shaft. The drill chuck rotates.

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

The handle-like structure has an external thread or a cross-section of the handle-like structure is polygonal.

beneficial effects

The drill chuck and power tool provided by the present disclosure are provided with multiple clamping claw grooves on the front body, and the multiple clamping claw grooves are evenly distributed around the axis of the precursor body, so that after the clamping jaws are installed, the drilling chuck is facilitated. The uniform force application of the tool ensures the stability and safety during use of the drilling tool, and the guide direction of the clamping claw groove is set along the radial direction of the front body, so that multiple clamping jaws can be driven by the rear body in their corresponding positions. It moves directionally under the constraints of the clamping jaw groove, and because the clamping jaw moves in the radial direction of the front body, this is conducive to increasing the diameter range of the drill tool that the drill chuck is adapted to, and is conducive to shortening the length of the clamping jaw, thereby conducive to Reduce the overall axial length of the drill chuck.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings in the following description are only illustrations of the present disclosure. For some embodiments, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram (half-section) of a drill chuck in one or more embodiments of the present disclosure;

Figure 2 is a schematic structural diagram of a precursor in one or more embodiments of the present disclosure;

Figure 3 is a top view of the precursor in Figure 2;

Figure 4 is a bottom view of the front body in Figure 2;

Figure 5 is an axial cross-sectional view of a precursor in one or more embodiments of the present disclosure;

Figure 6 is a schematic structural diagram (cross-section) of the rear body in one or more embodiments of the present disclosure;

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

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

Figure 9 is a left side view of the clamping jaw in Figure 8;

Figure 10 is a bottom view of the clamping jaw in Figure 8;

Figure 11 is a schematic structural diagram of the first adapter in one or more embodiments of the present disclosure;

Figure 12 is a cross-sectional view of the rolling groove at the first joint in one or more embodiments of the present disclosure;

Figure 13 is a structural diagram of a second adapter in one or more embodiments of the present disclosure;

Figure 14 is a schematic structural diagram of a clutch rotating sleeve in one or more embodiments of the present disclosure;

Figure 15 is a schematic structural diagram of the clutch rotating sleeve in one or more embodiments of the present disclosure from another perspective;

Figure 16 is another structural schematic diagram of a drill chuck in one or more embodiments of the present disclosure;

Figure 17 is a schematic structural view of the rear body of the drill chuck in Figure 16;

Figure 18 is a top view of the rear body in Figure 17;

Figure 19 is a schematic structural diagram of an end cap in one or more embodiments of the present disclosure;

Figure 20 is another structural schematic diagram of the first adapter in one or more embodiments of the present disclosure;

Figure 21 is a top view of the first joint in Figure 20;

Figure 22 is another structural schematic diagram of the second adapter in one or more embodiments of the present disclosure;

Fig. 23 is another structural schematic diagram of the second adapter in Fig. 22.

The details of the labels involved in the above drawings are as follows:

100. Clamp; 102. Clamp groove; 103. Front body; 104. Rear body; 105. First plane thread; 106. Second plane thread; 107. First limiting part; 108. Second limiting part ; 109. The third limiting part; 110. The first sub-part; 111. The second sub-part; 112. The third sub-part; 113. End cover; 114. Axial receiving hole; 115. Drilling tool receiving hole; 116 , first shoulder; 117, second shoulder; 118, rolling element; 119, first joint; 120, second joint; 121, first tooth structure; 122, second tooth structure; 123, elastic reset 124. Clutch rotating sleeve; 125. Rolling groove; 126. Ball; 127. Bump structure; 128. Fourth through hole; 129. Rear top cover; 130. Spline; 131. Spline groove; 132. Snap spring ; 133. Limiting step; 134. First bump; 135. First groove; 136. Second bump; 137. Second groove; 138. Circular through hole; 139. Emergency hole; 200. Installation Shaft hole.

Embodiments of the invention

In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present disclosure and are not intended to limit the present disclosure.

It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings. They are only for convenience of description and do not indicate or imply the device to which they are referred. Or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the disclosure. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "first" and "second" are only used for convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. "Plural" means two or more, unless otherwise expressly and specifically limited.

In order to illustrate the technical solutions provided by the present disclosure, detailed descriptions are given below with reference to specific drawings and embodiments.

Referring to Figure 1, in one or more embodiments, the present disclosure provides a drill chuck including: a clamping jaw 100, a front body 103 and a rear body 104; the number of clamping jaws is multiple; the front body 103 A plurality of clamping claw grooves 102 are provided, the plurality of clamping claw grooves 102 are evenly distributed around the axis of the front body 103, that is, the plurality of clamping claw grooves 102 are evenly distributed around the circumferential direction of the front body, and the guiding direction of the clamping claw grooves 102 is along the first direction. It is set that the first direction is perpendicular to the axis of the front body, and the sliding movement of the clamping jaw is limited in the clamping jaw slot 102; the rear body 104 is used to drive the clamping jaw to move in the first direction in the clamping jaw slot 102, so that the clamping jaw can move away from or Close to the axis of the precursor 103 .

The drill chuck provided by the present disclosure is provided with multiple jaw grooves 102 on the front body 103, and the multiple jaw grooves 102 are evenly distributed around the axis of the front body 103, so that after the clamp jaws are installed, the jaw alignment is facilitated. The uniform force application of the drilling tool ensures the stability and safety of the drilling tool during use. The guide direction of the clamping claw groove 102 is set along the radial direction of the front body 103, so that the clamping claw can be driven by the rear body 104 and move directionally under the restriction of the clamping claw groove 102, and because the clamping claw is along the front body 103 The radial movement is beneficial to increasing the diameter range of the drill tool to which the drill chuck is adapted, and is beneficial to shortening the length of the clamping jaw, thereby conducive to reducing the overall axial length of the drill chuck.

Referring to FIGS. 2 to 5 , in some embodiments, multiple clamping jaw slots 102 are provided in one-to-one correspondence with multiple clamping jaws, that is, the number of clamping jaw slots 102 is equal to the number of clamping jaws; one clamping jaw slot 102 A clamping jaw is installed in the front body; the clamping jaw groove 102 is used to guide the movement of the clamping jaw, so that the clamping jaw can move along the guiding direction of the clamping jaw slot 102, that is, the clamping jaw moves along the radial direction of the front body 103; multiple clamping jaws It can be driven by the rear body 104 to synchronously approach the axis of the front body 103 or to synchronously move away from the axis of the front body 103, so that multiple clamping jaws can move away from each other to achieve loosening of the drilling tool, or between multiple clamping jaws Close to each other to achieve clamping of the drilling tools. The rear body 104 rotates around the axis of the rear body 104 relative to the front body 103 to drive the plurality of clamping jaws so that the plurality of clamping jaws move 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 guide direction of the clamping jaw groove 102 is set along the radial direction of the front body 103 , and the rear body 104 is used to drive the clamping jaw forward in the clamping jaw slot 102 . The radial movement of the body 103 enables the jaws to move away from or closer 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 maintain a relative fixation between the front body 103 and the rear body 104 or to maintain a relative fixation between the front body 103 and the rear body 104 . Relative rotation can occur; when the clutch assembly keeps the front body 103 and the rear body 104 relatively fixed, it is beneficial to lock the drilling tool on the front body 103, and the forward and reverse rotation of the drill chuck can be realized, and When the drill chuck rotates forward and reverse, the drilling tool is not easy to loosen. In one embodiment, when the rear body 104 rotates forward relative to the front body 103, the rear body 104 realizes the clamping movement of the clamping jaws on the drilling tool. When the front body 103 and the rear body 104 rotate forward at the same time, the clamping jaws clamp the drilling tool. The locking force increases, so that the drill chuck has a self-tightening function; the drill tool has a relative front end and a rear end. The front end of the drill tool processes the same processing object, while the rear end of the drill tool is inserted into the drill chuck. , the rear end of the drill tool is clamped by multiple clamping jaws of the drill chuck, so that the drill tool can be detachably fixed on the drill chuck, so that the drill tool can rotate together with the drill chuck. When the drill tool is installed on the drill chuck, when viewed from the rear 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 counterclockwise rotation direction of the drill chuck is The direction is the reverse direction of the drill chuck. When the rear body 104 rotates in the forward direction of the drill chuck, the multiple clamping jaws clamp the drill tool; when the rear body 104 rotates in the reverse direction of the drill chuck, the multiple clamping jaws clamp the drill tool. Tools for loosening operation. Bidirectional rotation of the drill chuck can be achieved through the clutch combination, so that the drilling tool can work in both directions.

Referring to Figures 3 and 4, it is shown that in one embodiment, the number of clamping claw grooves 102 is three. Among the three clamping claw grooves 102, the corresponding center of the circle between two adjacent clamping claw grooves 102 is The angle is 60 degrees.

Referring to Figures 1 and 5, it is shown that in some embodiments, the guiding direction of the clamping jaw groove 102 is parallel to the radial direction of the front body 103; one end surface of the clamping jaw has a first plane thread 105, and the rear body 104 One end surface has a second flat thread 106 that matches the first flat thread 105, so that when the rear body 104 rotates relative to the front body 103, the clamping jaw can move in the radial direction of the front body 103. The clamping jaw has opposite front and rear ends, and the first flat thread 105 is located on the end surface of the rear end of the clamping jaw. The rear body 104 has an opposite front end and a rear end, and the second planar thread 106 is located on the end surface of the front end of the rear body 104 . In one embodiment, the front-to-back direction of each component of the drill chuck is consistent with the front-to-back direction of the drill chuck, and the drilling tool is installed from the front end of the drill chuck. The first flat thread 105 on the clamping jaw meshes with the second flat thread 106 on the rear body 104, so that when the rear body 104 rotates relative to the front body 103, the first flat thread 105 and the second flat thread 106 are realized. The rotational motion of the rear body 104 is converted into the linear motion of the clamping jaw along the clamping jaw groove 102; the first plane thread 105 is a plane rectangular thread, and the second plane thread 106 is a plane rectangular thread. The rotation movement can be better realized by the plane rectangular thread. Conversion between linear motion and linear motion improves transmission efficiency.

Referring to FIG. 1 , in some embodiments, the jaw groove 102 includes a first limiting part 107 , a second limiting part 108 and a third limiting part 109 that are connected in sequence. The axial direction of the first limiting part 107 The width of the cross-section is greater than the width of the axial cross-section of the second limiting part 108, and the width of the axial cross-section of the second limiting part 108 is smaller than the width of the axial cross-section of the third limiting part 109; the clamping jaws include successively connected The first sub-part 110, the second sub-part 111 and the third sub-part 112, the first sub-part 110 is adapted to the first limiting part 107, the second sub-part 111 is adapted to the second limiting part 108, The third sub-portion 112 is adapted to the third limiting portion 109 . Through the design of the clamping jaw slot 102 and the clamping jaw, the clamping jaw is limited to the clamping jaw slot 102 to ensure that the clamping jaw moves in the radial direction of the front body 103 and the clamping jaw is not easy to shake in the clamping jaw slot 102.

Referring to Figure 1, in some embodiments, the drill chuck also includes an end cap 113. The end cap 113 is fixedly connected to the end surface of one end of the front body 103. The front body 103 has an axial receiving hole 114, and the rear body 104 passes through the end surface. The cover 113 is limited in the axial receiving hole 114. The end cover 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 drilling tool receiving hole 115 connected to the axial receiving hole 114 for inserting the drilling tool and clamping the drilling tool through the clamping jaw. The direction from the rear end of the front body 103 to the front end of the front body 103 is the axial receiving hole 114 and the drilling tool receiving hole 115 in order. A stepped surface is formed between the axial receiving hole 114 and the drilling tool receiving hole 115 to limit the position of the rear body 104, so that the rear body 104 cooperates with the stepped surface of the front body 103 and the end cover 113 to realize the rear body 104. is limited to the precursor 103.

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

Referring to FIG. 6 , in some embodiments, the rear body 104 has a first shoulder 116 , and a plurality of rolling elements 118 are disposed between the end surface of the first shoulder 116 and the end surface of the end cover 113 , and the rolling elements 118 are located In the axial receiving hole 114 , at least one of the end surface of the first shoulder 116 and the end surface of the end cover 113 is in contact with the rolling element 118 . By arranging the rolling body 118, it is convenient to realize the rotation of the rear body 104 relative to the front body 103, and with the cooperation of the end cover 113 and the rolling body 118, the axial fixation of the rear body 104 and the front body 103 is achieved, that is, the rear body 104 will not face each other. The front body 103 moves axially, but the rear body 104 can rotate relative to the front body 103 .

As shown in FIG. 1 , in one embodiment, the rolling element 118 is a ball, and the material of the ball is steel, that is, the rolling element 118 is a steel ball; the end surface of the first shoulder 116 and the end surface of the end cover 113 are uniformly aligned with the rolling element 118 contact.

It should be noted that in some other embodiments, the rolling element 118 may also be a needle roller, and the needle roller is a needle roller in a needle roller bearing. In some other embodiments, multiple rolling elements 118 may be installed on a cage to achieve spaced arrangement between the multiple rolling elements 118 , and the multiple rolling elements 118 and the cage form a thrust bearing.

Referring to FIGS. 1 , 11 , 13 and 13 , in some embodiments, the clutch assembly includes a first engagement 119 and a second engagement 120 , the first engagement 119 being configured to be synchronized with the front body 103 Rotate, the second joint 120 is 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 maintain a relatively fixed joint state; The first joint 119 and the second joint 120 also have a separated state that enables relative rotation between the front body 103 and the rear body 104 . The coupling or disconnection between the rear body 104 and the front body 103 is achieved through the first coupling element 119 and the second coupling element 120 , that is, when the first coupling element 119 and the second coupling element 120 are coupled, the rear body 104 and the front body 103 are engaged. The bodies 103 can rotate synchronously to realize the bidirectional rotation of the drill chuck. When the first joint 119 and the second joint 120 are disconnected, the rear body 104 can rotate relative to the front body 103, thereby realizing the driving of the rear body 104 The clamping jaw clamps or loosens the drilling tool.

In some embodiments, the first joint 119 and the second joint 120 are configured to achieve switching between the engaged state and the separated state by reducing the distance or increasing the distance. When the first joint 119 When the distance between the first joint 119 and the second joint 120 is reduced to the first set value, the first joint 119 and the second joint 120 are joined; 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, the phases are disconnected.

Referring to FIG. 1 , in some embodiments, the first joint 119 is circumferentially fixed to the front body 103 , the first joint 119 is axially fixed to the front body 103 , and the second joint 120 is circumferentially fixed to the rear body 104 , and the second joint 120 can move along the axial direction of the rear body 104, so that the second joint 120 moves relative to the rear body 104 along the axial direction of the rear body 104 to realize the connection between the first joint 119 and the second joint. The distance changes, thereby realizing the engagement or separation between the first connector 119 and the second connector 120 . In one embodiment, the first joint 119 and the end cover 113 are fixed on the front body 103 by screws. The second connector 120 has a second through hole. The hole wall of the second through hole has splines. The rear body 104 has a spline groove 131 that matches the spline 130 on the second connector 120. The second connector 120 It is sleeved on the rear body 104, so that the circumferential fixation between the second joint 120 and the rear body 104 is achieved through the cooperation of the splines and the spline grooves 131, and the second joint 120 can move along the axial direction of the rear body 104. .

It should be noted that in some other embodiments, the first joint 119 and the end cover 113 are an integral structure; in other embodiments, the first joint 119 , the end cover 113 and the front body 103 are an integral structure. In some other embodiments, the second through hole is a waist-shaped hole, and the rear body 104 has a cross-sectional shape matching the waist-shaped hole, so that the second joint 120 can also move along the axial direction of the rear body 104 .

Referring to Figures 16, 17, 18, 19 and 20, in some other embodiments, the first joint 119 is circumferentially fixed to the front body 103, and the first joint 119 can be along the axis of the front body 103. When moving in the direction, the second joint 120 and the rear body 104 are circumferentially fixed, and the second joint 120 and the rear body 104 are fixed axially. There is a concave and convex limiting structure between the end cap and the first joint, so that the first joint moves axially relative to the end cap, and the first joint and the end cap are circumferentially fixed; wherein the concave and convex limiting structure includes : The first protrusion 134 and the first groove 135 provided on the end cover, the second protrusion 136 and the second groove 137 provided on the first joint, the first protrusion extends into the second groove, The second protrusion extends into the first groove. The side of the end cover facing the first joint has a plurality of first protrusions extending along the axial direction of the end cap. The plurality of first protrusions extend along the circumference of a set circle. They are arranged at even intervals, the center of the setting circle is concentric with the center of the end cover, and a first groove is formed between two adjacent first protrusions. The outer side of the first joint has a plurality of second bumps extending along the axial direction of the first joint. The plurality of second bumps are evenly spaced along the circumferential direction of a set circle. The center of the set circle is equal to the center of the circle. The center of the first joint is concentric, and a second groove is formed between two adjacent second protrusions; the first joint and the end cover are coaxially arranged. The holes opened on the first joint and the end cover are smooth circular through holes 138 for the rear body to pass through.

Referring to FIG. 1 , in some embodiments, the drill chuck further includes an elastic return member 123 , and the elastic return member 123 is configured to cause the first joint 119 and the second joint 120 to move from a separated state to an engaged state. Switching tendency; the first joint 119 has an opposite inner side and an outer side, the second joint 120 has an opposite inner side and an outer side, the inner side of the first joint 119 is opposite to the inner side of the second joint 120, and the first joint 119 has an opposite inner side and an outer side. The inner surface of 119 has a first tooth structure 121, and the inner surface of the second joint 120 has a second tooth structure 122 meshing with the first tooth structure 121; both the first tooth structure 121 and the second tooth structure 122 can be In the form of end face teeth, when the first tooth structure 121 meshes with the second tooth structure 122, the engagement state between the first joint 119 and the second joint 120 is achieved. When the first tooth structure 121 and the second After the tooth structure 122 is completely separated, the separation state between the first joint 119 and the second joint 120 is achieved.

Referring to FIG. 1 , in some embodiments, the elastic restoring member 123 is located outside the second joint 120 . The elastic restoring member 123 is sleeved on the rear body 104 . The elastic return member 123 is a wave spring.

Referring to FIG. 16 , in some other embodiments, the elastic return member 123 is located outside the first joint 119 . Specifically, the elastic return member 123 is located between the first joint 119 and the end cover 113, and is sleeved on the rear body. When the first joint is circumferentially fixed through the concave and convex limiting structure between the end cover and the first joint and can move along the axial direction of the front body, the elastic return member causes the first joint to be in contact with the second joint. When separated, the first protrusion still extends into the second groove, and the second protrusion still extends into the first groove.

In some embodiments, the drill chuck further includes a clutch rotating sleeve 124. The front body 103, the rear body 104 and the clutch rotating sleeve 124 are coaxially arranged. The clutch rotating sleeve 124 is configured to be able to rotate relative to the rear body 104 to change the third The distance between one joint 119 and the second joint 120.

Referring to Figures 11, 12, 15, 20 and 21, in some embodiments, the inner surface of the first joint 119 also has a plurality of rolling grooves 125, and the plurality of rolling grooves 125 are formed in the first joint. The inner surface of the element 119 is evenly arranged around a circle, and the center of the circle passes through the center of the first joint element 119 . Both the first connector 119 and the second connector 120 adopt a sheet structure. 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, so that the ball 126 is located between the first joint 119 and the second joint 120. When the ball 126 is located at the deepest part of the rolling groove 125, the first joint 119 and the second joint 120 When the ball 126 moves from the other end of the rolling groove 125 to one end of the rolling groove 125, the ball 126 gradually increases the distance between the first joint 119 and the second joint 120. When the second joint 120 When the distance between the first joint 119 and the first joint 119 is greater than or equal to the second set value, the first tooth structure 121 and the second tooth structure 122 are no longer in mesh, thereby realizing the first joint 119 and the second joint 120 separation between. The inner wall of the clutch rotating sleeve 124 is provided with a plurality of bump structures 127 protruding in the radial direction of the clutch rotating sleeve 124. The bump structures have fourth through holes 128. The number of the bump structures is equal to the number of the rolling grooves 125. The rolling grooves The number of 125 is equal to the number of balls 126. The ball 126 is limited in the fourth through hole 128, and the axial height of the ball 126 is greater than the axial height of the bump structure, which facilitates the change of the distance between the first joint 119 and the second joint 120 through the ball 126. . The rotation of the clutch rotating sleeve 124 drives the ball 126 to move in the rolling groove 125, so that the ball 126 moves back and forth between one end and the other end of the rolling groove 125, thereby realizing the joint between the first joint 119 and the second joint 120. or separation. When the clutch rotating sleeve 124 rotates in the forward direction of the drill chuck, the first joint 119 and the second joint 120 are separated. When the clutch rotating sleeve 124 rotates in the reverse direction of the drill chuck, the first joint 119 is separated from the second joint 120 . 119 is engaged with the second adapter 120 .

Referring to FIG. 1 , in one embodiment, the ball 126 is in the shape of a sphere. When viewed from the inside of the first joint 119 to the outside of the first joint 119 , the rolling groove 125 is basically in the shape of a drop, which facilitates the passage of the ball 126 . The separation between the first joint 119 and the second joint 120 is achieved. Optionally, the number of rolling grooves 125 is three, and the number of rolling balls 126 is three. It should be noted that in some other embodiments, the ball 126 may also be conical or truncated.

Referring to FIG. 1 , in some embodiments, the drill head further includes a rear top cover 129 having a third through hole, and the rear body 104 has a second shoulder 117 , and the second shoulder 117 is close to the rear body 104 The rear end of the rear top cover 129 is limited to the rear body 104 through the second shoulder 117. The third through hole is a waist-shaped hole. The rear end of the rear body 104 has a cross-section that is similar to the waist-shaped hole, so that the rear end of the rear body 104 has a cross-section similar to the waist-shaped hole. The body 104 and the rear top cover 129 are circumferentially fixed. The rear body 104 also has a latching slot, and a circlip 132 is installed in the latching slot, so that the rear top cover 129 is located between the circlip 132 and the elastic return member 123, and the second joint 120 is located between the first joint 119 and the elastic return member. between 123. The first connector 119 is located between the end cover 113 and the second connector 120 .

Referring to Figures 16, 17, 22 and 23, in some other embodiments, the first joint 119 is circumferentially fixed to the front body 103, and the first joint 119 can move along the axial direction of the front body 103. , the second joint 120 and the rear body 104 are circumferentially fixed, and when the second joint 120 and the rear body 104 are fixed axially, the second joint has a waist-shaped hole, and the rear body has a waist-shaped hole consistent with the second joint The cross section of the hole is similar to that of the hole, so that the rear body and the second joint are circumferentially fixed. At the same time, the second joint is limited by the second shoulder 117 on the rear body, and the rear top cover and the rear body are circumferentially fixed. ; The rear top cover 129 and the second joint are axially limited to the rear body through the retaining spring 132 and the second shoulder, so that the second joint is axially fixed relative to the rear body. When the clutch rotating sleeve 124 is rotated, the ball 126 is driven to move in the rolling groove 125, so that the ball 126 moves back and forth between one end and the other end of the rolling groove 125, thereby realizing the axial movement of the first joint along the front body to overcome the problem. The force of the elastic return member or the action of the elastic return member causes the first joint to move relative to the end cover, so that the first joint and the second joint are separated or joined. When the force of the elastic return member is overcome, When the distance between the first joint and the end cover is reduced, the first joint and the second joint are separated. Similarly, under the action of the elastic return member, the distance between the first joint and the end cover is reduced. The distance can be reduced so that the first joint engages the second joint.

Referring to FIG. 14 , in some examples, the two ends of the inner wall of the clutch rotation sleeve 124 are respectively provided with limiting steps 133 , so that the rear top cover 129 abuts the step surface of one of the limiting steps 133 , so that the front body 103 The end surface of the rear end abuts the step surface of another limiting step 133, thereby achieving axial fixation of the clutch rotating sleeve 124, and the clutch rotating sleeve 124 can rotate relative to the rear body 104 around the axial direction of the rear body 104.

Referring to Figure 1, Figure 2 and Figure 16, in some embodiments, the front body has an emergency hole 139 or multiple emergency holes symmetrically arranged in the circumferential direction, and a screwdriver or hook wrench is inserted into the emergency hole to implement the drill chuck. of clamping or loosening. After setting the emergency hole in this way, the initial clamping force of the drill chuck can be increased, and the drill chuck can also be loosened under the action of a round-shank screwdriver.

In one or more embodiments, the present disclosure also provides a power tool, which includes: a driving shaft and a drill chuck in any embodiment; the driving shaft is connected to the rear body 104 for driving the rear body 104 Turn. The end surface of the rear end of the rear body 104 has a mounting shaft hole. The mounting shaft hole matches the driving shaft. The rear body 104 is driven to rotate by the driving shaft. When the first joint 119 and the second joint 120 are engaged, the rear body 104 is realized. Synchronous rotation with the front body 103 . The mounting shaft hole 200 is a hole or a threaded hole with a polygonal cross section, and the driving shaft is installed in the mounting shaft hole. It should be noted that in some other embodiments, the rear end of the rear body may have an externally threaded handle structure, or a handle structure with a polygonal cross-section, to cooperate with the drive shaft to realize the drive shaft driving the drill chuck. Turn.

The above are only optional embodiments of the present disclosure and are not used to limit the present disclosure. Various modifications and variations may occur to the present disclosure to those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this disclosure shall be included in the scope of the claims of this disclosure.

Claims

A drill chuck, which is characterized in that it includes:

Clamps, the number of the clamps is multiple;

The precursor is provided with a plurality of clamping claw grooves, the plurality of clamping claw grooves are evenly distributed around the axis of the precursor, the guiding direction of the clamping claw grooves is arranged along the first direction, and the first The direction is perpendicular to the axis of the front body, and the jaw sliding is limited in the jaw groove; and

The rear body is used to drive the clamping jaw to move in the first direction in the clamping jaw slot so that the clamping jaw can move away from or approach the axis of the front body.
The drill chuck of claim 1, further comprising a clutch assembly configured to maintain relative fixation between the front body and the rear body or to enable the front body and the rear body to remain relatively fixed. The rear bodies can rotate relative to each other.
The drill chuck of claim 2, wherein the first direction is parallel to the radial direction of the front body, and the guide direction of the jaw groove is parallel to the radial direction of the front body; An end surface of the clamping jaw has a first plane thread, and an end surface of the rear body has a second plane thread that matches the first plane thread, so that when the rear body rotates relative to the front body, The clamping jaw is allowed to move in the first direction.
The drill chuck of claim 3, wherein the first plane thread is a plane rectangular thread, and the second plane thread is a plane rectangular thread.
The drill chuck according to claim 1, further comprising an end cover fixedly connected to an end surface of one end of the front body, the front body having an axial receiving hole, and the rear body The end cap is limited in the axial receiving hole, the end cap has a first through hole, and the opposite end of the rear body passes through the first through hole.
The drill chuck of claim 5, wherein the rear body has a first shoulder, and a plurality of rolling elements are provided between the end surface of the first shoulder and the end surface of the end cap, and The rolling element is located in the axial receiving hole; at least one of the end surface of the first shoulder and the end surface of the end cover is in contact with the rolling element.
The drill chuck according to claim 1, wherein the jaw groove includes a first limiting part, a second limiting part and a third limiting part that are connected in sequence, and the first limiting part has The width of the axial cross-section is greater than the width of the axial cross-section of the second limiting part, and the width of the axial cross-section of the second limiting part is smaller than the width of the axial cross-section of the third limiting part;

The clamping jaw includes a first sub-part, a second sub-part and a third sub-part that are connected in sequence. The first sub-part is adapted to the first limiting part, and the second sub-part is adapted to the first limiting part. The second limiting part is adapted to fit, and the third sub-part is adapted to the third limiting part.
The drill chuck of claim 2, wherein the clutch assembly includes a first engagement element and a second engagement element, the first engagement element being configured to rotate synchronously with the front body, and the The second joint is configured to rotate synchronously with the rear body;

The first joint and the second joint have a joint state that enables the front body and the rear body to maintain a relatively fixed joint state;

The first joint and the second joint also have a separation state that enables relative rotation between the front body and the rear body.
The drill chuck of claim 8, wherein the first joint and the second joint are configured to reduce or increase the distance between each other to achieve the joint state and the second joint. switching between the separation states.
The drill chuck of claim 9, wherein the first joint is circumferentially fixed to the front body, the first joint is axially fixed to the front body, and the second joint is fixed to the front body axially. The second joint is circumferentially fixed to the rear body, and the second joint can move axially along the rear body.
The drill chuck according to claim 9, wherein the first joint is circumferentially fixed to the front body, the first joint is movable along the axial direction of the front body, and the third joint is axially movable along the front body. The two connectors are circumferentially fixed to the rear body, and the second connector is axially fixed to the rear body.
The drill chuck according to claim 10 or 11, further comprising an elastic return member configured to ensure that there is a gap between the first joint and the second joint. The tendency of the separation state to switch to the engagement state;

The first joint has an opposite inner side and an outer side, the second joint has an opposite inner side and an outer side, the inner side of the first joint is opposite to the inner side of the second joint, and the first joint has an inner side opposite to an inner side of the second joint. The inner surface of the joint has a first tooth structure, and the inner surface of the second joint has a second tooth structure that meshes with the first tooth structure;

The elastic return component is located outside the first joint, or the elastic return component is located outside the second joint.
The drill chuck according to claim 9, further comprising a clutch rotating sleeve, the front body, the rear body and the clutch rotating sleeve are coaxially arranged, and the clutch rotating sleeve is configured to be able to oppose each other. The rear body is rotated to change the distance between the first joint and the second joint.
The drill chuck of claim 13, wherein the inner surface of the first joint further has a plurality of rolling grooves, and the groove depth of the rolling grooves gradually increases from one end to the other end; The rolling groove accommodates balls; the rotation of the clutch rotating sleeve can cause the balls to reciprocate between one end and the other end of the rolling groove, so that the first joint and the second joint Interphase joining or separation.
The drill chuck according to claim 5 or 6, characterized in that there is a concave and convex limiting structure between the end cover and the first joint, so that the first joint can move axially relative to the end cover, And the first joint and the end cover are circumferentially fixed, wherein the concave and convex limiting structure includes: a first bump and a first groove provided on the end cover, and a first joint There are a second protrusion and a second groove on the sub-assembly, the first protrusion extends into the second groove, and the second protrusion extends into the first groove.
The drill chuck according to claim 11, wherein the front body has one emergency hole in its circumferential direction, or a plurality of emergency holes are symmetrically arranged in the circumferential direction of the front body.
A power tool, characterized in that it includes: a driving shaft and a drill chuck according to any one of claims 1 to 16; the driving shaft is connected to the rear body and is used to drive the rear body Turn.
The power tool according to claim 17, wherein the end surface of the rear end of the rear body has a mounting shaft hole or a handle-shaped structure; the mounting shaft hole matches the driving shaft or the handle-shaped structure matches the driving shaft. The driving shaft cooperates to drive the drill chuck to rotate through the driving shaft.
The power tool according to claim 18, wherein the mounting shaft hole is a threaded hole or a hole with a polygonal cross-section;

The handle-like structure has an external thread or a cross-section of the handle-like structure is polygonal.