Self-tightening drill chuck

Abstract

The application provides a self-tightening drill chuck, which comprises a rear body, a front body, a clutch assembly and a separating element. The rear body is used for being connected to a driving shaft of a driver and rotating synchronously with the driving shaft. The front body is connected to the rear body and is provided with a plurality of clamping jaws. Each clamping jaw is clamped to a drill tool when the front body rotates forward with the rear body, and each clamping jaw is loosened to the drill tool when the front body rotates reversely relative to the rear body. The clutch assembly comprises a ratchet ring arranged in a ring shape and fixed to one of the rear body and the front body, a plurality of pawls arranged around a central axis of the ratchet ring and arranged in one-way rotation on the other of the rear body and the front body, an elastic member used for applying elastic force to make the pawls abut against ratchets of the ratchet ring, and the separating element arranged on the front body or the rear body. The separating element is used for pushing the pawls to be separated from the ratchet ring. The self-tightening drill chuck provided by the application has a larger meshing force between the pawls and the ratchets, and has a stronger retreat-stopping capacity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mechanical drilling processing, and more particularly to a self-tight drill chuck. BACKGROUND

[0002] The self-tight drill chuck includes a gear self-tight drill chuck and a flat jaw self-tight drill chuck, and generally comprises a front body and a rear body capable of switching between relative rotation and relative static state.

[0003] Specifically, a plurality of clamping jaws for clamping a drill are arranged in the front body, and a clutch assembly is arranged between the front body and the rear body. The clutch assembly is a combined structure comprising a pawl, a ratchet ring, and a driving member for driving the ratchet ring and the pawl to engage or disengage, that is, the ratchet ring is fixedly arranged on the rear body, and the pawl is rotatably arranged on the front body.

[0004] In the foregoing clutch assembly, due to the limited number of pawls, the engagement force between the pawls and the ratchet teeth is limited. Therefore, during the drilling process, when a larger cutting resistance suddenly causes the front body to be static relative to the rear body, or when the front body is reversed relative to the rear body due to misoperation during assembly of the drill, the pawl is prone to loosen and disengage from the ratchet teeth, that is, the drill chuck has weak anti-backout capability, resulting in unstable clamping of the drill by the clamping jaws. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a self-tight drill chuck to solve the technical problem of weak anti-backout capability of the drill chuck caused by limited engagement force between the pawl and the ratchet tooth in the prior art.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the embodiments of the present application is to provide a self-tight drill chuck, which comprises:

[0007] a rear body for connecting to a driving shaft of a driver and rotating synchronously with the driving shaft;

[0008] a front body, wherein a plurality of clamping jaws are arranged, the front body is connected to the rear body, and each of the clamping jaws clamps a drill relative to each other when the front body rotates in the same direction as the rear body, and each of the clamping jaws releases the drill relative to each other when the front body rotates in the opposite direction to the rear body;

[0009] a clutch assembly, comprising a ratchet ring arranged in a ring shape and fixedly arranged on one of the rear body and the front body, a plurality of pawls arranged around the central axis of the ratchet ring and rotatably arranged on the other of the rear body and the front body, a resilient member for applying a resilient force to make the pawl abut against the ratchet teeth of the ratchet ring, and a separating member arranged on the front body or the rear body; the separating member is used to push the pawl and the ratchet ring to disengage.

[0010] Optionally, the ratchet ring is formed on the outer circumferential surface of the rear body; or the clutch assembly further comprises a rear sleeve fixedly sleeved on the rear body, and the ratchet ring is formed on the inner circumferential wall of the rear sleeve.

[0011] Optionally, the clutch assembly further comprises a switch sleeve rotationally arranged on the front body, and the separating member is formed on the switch sleeve; when the switch sleeve rotates, the separating member pushes the pawl to disengage from the ratchet ring.

[0012] Optionally, a containing groove for containing the separating member is circumferentially arranged on the outer circumferential surface of the front body; when the separating member is in the first position where the pawl engages with the ratchet ring or the second position where the pawl disengages from the ratchet ring, the separating member respectively abuts against the two end walls circumferentially arranged on the containing groove.

[0013] Optionally, a limiting structure is arranged between the front body and the switch sleeve, and the limiting structure is used for keeping the separating member in the first position or the second position.

[0014] Optionally, the front body comprises a connecting seat and a pawl seat, the pawl seat is capable of sliding along the axial direction of the connecting seat relative to the connecting seat, each pawl is rotationally arranged on the end surface of the pawl seat, and the separating member is used for pushing the pawl seat to slide along the axial direction of the connecting seat so as to make the pawl engage with and / or disengage from the ratchet ring.

[0015] Optionally, a restoring member is connected between the connecting seat and the pawl seat, and the restoring member is used for pushing the pawl seat to move along the axial direction of the connecting seat so as to keep the ratchet ring engaged with the pawl.

[0016] Optionally, the front body comprises a clamping jaw seat and a pawl seat, the pawl seat is capable of sliding along the axial direction of the clamping jaw seat relative to the clamping jaw seat, each pawl is rotationally arranged on the end surface of the pawl seat, and the separating member is used for pushing the pawl seat to slide along the axial direction of the clamping jaw seat so as to make the pawl engage with and / or disengage from the ratchet ring.

[0017] Optionally, a restoring member is connected between the clamping jaw seat and the pawl seat, and the restoring member is used for pushing the pawl seat to move along the axial direction of the clamping jaw seat so as to keep the ratchet ring engaged with the pawl.

[0018] Optionally, an end cover is fixedly arranged on the end surface of the clamping jaw seat, the pawl seat is axially slidably sleeved on the end cover, and the restoring member is arranged between the end cover and the pawl seat.

[0019] Optionally, the restoring member is a spring.

[0020] Optionally, a guide groove is arranged on the end surface of the pawl seat in the circumferential direction, the groove bottom of the guide groove has a continuously changing depth in the circumferential direction on the pawl seat; at least part of the separating piece abuts against the groove bottom of the guide groove and can move in the circumferential direction relative to the guide groove.

[0021] Optionally, the limiting structure comprises limiting grooves respectively formed at two ends of the guide groove, and the limiting grooves are used for accommodating the separating piece.

[0022] Optionally, an angle limiting structure is arranged between the pawl seat and the pawl, and the angle limiting structure is used for limiting the rotation angle of the pawl.

[0023] Optionally, the angle limiting structure comprises a positioning pin arranged on one of the pawl seat and the pawl, and an arc-shaped positioning groove arranged on the other one of the pawl seat and the pawl, and the positioning groove is used for inserting the positioning pin.

[0024] Optionally, the pawl is arranged on the end surface of the front body in a rotatable manner; the limiting structure is a ball socket arranged on the front body corresponding to the first position and the second position, and a bumping ball arranged on the switch sleeve, and the bumping ball can be clamped in the ball socket.

[0025] Optionally, the elastic piece is a torsion spring or a tension spring.

[0026] Optionally, the self-tightening drill chuck is a gear self-tightening drill chuck or a flat jaw self-tightening drill chuck.

[0027] The self-tightening drill chuck provided by the embodiments of the present application has at least the following beneficial effects:

[0028] A plurality of pawls are arranged on the front body or the rear body around the ratchet ring in a rotatable manner, and an elastic piece for keeping each pawl in engagement with the ratchet ring is arranged corresponding to each pawl. In this way, when the front body and the rear body need to be rotated synchronously, each pawl can keep stable engagement with the ratchet ring under the pulling of the elastic piece, thereby improving the stability of synchronous rotation of the front body and the rear body, and avoiding easy reverse rotation of the front body relative to the rear body, and the self-tightening drill chuck has strong anti-backout capability; when the front body needs to be rotated reversely relative to the rear body, the ratchet and the ratchet ring can be disengaged by operating the separating piece, so that the clamping jaw can be loosened. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0030] Figure 1 This is an exploded view of the flat-jaw self-tightening drill chuck in some embodiments of this application;

[0031] Figure 2 for Figure 1 A cross-sectional view of the flat-jaw self-tightening drill chuck in the embodiment;

[0032] Figure 3 for Figure 1 A perspective view of the self-tightening drill chuck with flat claws in the embodiment;

[0033] Figure 4 for Figure 1 Exploded view of the connecting seat and clutch assembly in the embodiment;

[0034] Figure 5 This is a perspective view of the pawl mount in some embodiments of this application;

[0035] Figure 6 for Figure 5 The embodiment shows a perspective view of the limiting groove at the first position and the limiting groove at the second position;

[0036] Figure 7 This is a perspective view of the pawl in some embodiments of this application;

[0037] Figure 8 This is a perspective view of the rear sleeve in some embodiments of this application;

[0038] Figure 9 This is an exploded view of the flat-jaw self-tightening drill chuck in some other embodiments of this application;

[0039] Figure 10 for Figure 9 A cross-sectional view of the self-tightening drill chuck with flat claws in the embodiment;

[0040] Figure 11 for Figure 9 A perspective view of the self-tightening drill chuck with flat claws in the embodiment;

[0041] Figure 12 for Figure 9 Exploded view of the connecting seat and clutch assembly in the embodiment;

[0042] Figure 13 This is a perspective view of the switch sleeve in some embodiments of this application;

[0043] Figure 14 for Figure 13 A perspective view of the switch sleeve from another angle in the embodiment;

[0044] Figure 15 This is an exploded view of a gear-driven self-tightening drill chuck in some embodiments of this application;

[0045] Figure 16 forFigure 15 A cross-sectional view of the gear self-tightening drill chuck in an embodiment;

[0046] Figure 17 A perspective view of the gear self-tightening drill chuck in an embodiment; Figure 15 A cross-sectional view of the gear self-tightening drill chuck in an embodiment;

[0047] Figure 18 A perspective view of the gear self-tightening drill chuck in an embodiment; Figure 15 An exploded view of the jaw seat and clutch assembly in an embodiment;

[0048] Figure 19 An exploded view of the gear self-tightening drill chuck in another embodiment of the present application;

[0049] Figure 20 A cross-sectional view of the gear self-tightening drill chuck in an embodiment; Figure 19 A cross-sectional view of the gear self-tightening drill chuck in an embodiment;

[0050] Figure 21 A perspective view of the gear self-tightening drill chuck in an embodiment; Figure 19 A perspective view of the gear self-tightening drill chuck in an embodiment.

[0051] In the drawings:

[0052] 100, rear body; 110, driving bevel gear;

[0053] 200, front body; 201, accommodating groove; 202, ball socket; 203, sliding groove; 204, matching hole;

[0054] 210, connecting seat; 220, pawl seat; 221, guide slot; 222, limiting slot; 231, pull pin; 232, jaw body; 233, front cone sleeve; 240, jaw seat; 241, gear slot; 250, reset member; 260, end cover; 271, driven bevel gear;

[0055] 300, jaw;

[0056] 400, clutch assembly; 401, ratchet ring;

[0057] 410, rear sleeve; 420, pawl; 421, positioning slot; 430, switch sleeve; 431, separating member; 432, impact bead; 433, through hole; 440, elastic member; 450, positioning pin. DETAILED DESCRIPTION

[0058] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects clearer, the present application will be further described in detail below with reference to the drawings and embodiments.

[0059] It should be understood that the specific embodiments described herein are merely intended to explain the present application and are not intended to limit the present application.

[0060] It should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or indirectly on the other element.

[0061] When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0062] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0063] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0064] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0065] Please refer to Figures 1 to 21 , now the self-tightening drill chuck provided by the embodiments of the present application will be described.

[0066] Referring to Figures 1 to 3 , Figures 9 to 11 , Figures 15 to 17 , and Figures 19 to 21 , the self-tightening drill chuck described in the present application comprises a front body 200, a rear body 100 and a clutch assembly 400.

[0067] Specifically, the rear body 100 is used to connect with the driving shaft of a driver, which can be a machine tool, an impact drill, a hand drill or the like.

[0068] The front body 200 is rotatably arranged on the rear body 100, which can be in a synchronous rotation state or a relative rotation state with the rear body 100, and the relative rotation state includes forward rotation and reverse rotation.

[0069] A plurality of clamping jaws 300 (generally three) are arranged in the front body 200, each clamping jaw 300 can be clamped or released relative to each other, and each clamping jaw 300 is used to clamp a drill tool, which can be understood as including but not limited to a drill bit, a tapping tool and the like.

[0070] When the front body 200 rotates relative to the rear body 100 in a forward direction, the clamping jaws 300 are clamped to each other so as to tightly hold the drill; when the front body 200 rotates relative to the rear body 100 in a reverse direction, the clamping jaws 300 are loosened to each other so as to release the drill.

[0071] It can be understood that, with reference to Figures 1 to 3 、 Figures 9 to 11 、 Figures 15 to 17 , and Figures 19 to 21 , the self-tightening drill chuck described in the embodiments of the present application can be a gear self-tightening drill chuck or a flat jaw self-tightening drill chuck.

[0072] With reference to Figures 1 to 3 、 Figures 9 to 11 , when the self-tightening drill chuck is a flat jaw self-tightening drill chuck, the front body 200 comprises a connecting seat 210, a pull pin 231, a clamping jaw body 232, and a front taper sleeve 233. Wherein:

[0073] The connecting seat 210 is sleeved on the outer circumferential surface of the rear body 100 and is rotationally connected with the rear body 100; the outer circumferential surface of the pull pin 231 is provided with external threads, the bottom surface of the rear body 100 is provided with a threaded hole, and the pull pin 231 is threadedly connected in the threaded hole of the rear body 100; the clamping jaw body 232 is sleeved on the outer side of the pull pin 231 and is threadedly connected with the connecting seat 210, the clamping jaw body 232 and the pull pin 231 are fixedly arranged in the circumferential direction but can move relative to each other in the axial direction, each clamping jaw 300 is slidingly arranged in the clamping jaw body 232 and can simultaneously slide in the axial and radial directions in the clamping jaw body 232, and the top of each clamping jaw 300 is slidingly fitted with the pull pin 231 in the radial direction; the front taper sleeve 233 is threadedly connected with the connecting seat 210 and covers the clamping jaw body 232 therein.

[0074] When the front body 200 rotates relative to the rear body 100 in a forward direction, the connecting seat 210, the pull pin 231, the clamping jaw body 232, each clamping jaw 300, and the front taper sleeve 233 rotate synchronously, and since the pull pin 231 is threadedly connected with the rear body 100, during the forward rotation, the pull pin 231 moves in the axial direction close to the top end of the rear body 100, thereby pulling each clamping jaw 300 to move in the radial direction to approach each other, that is, each clamping jaw 300 is clamped to each other; when the front body 200 rotates relative to the rear body 100 in a reverse direction, the reverse is true.

[0075] With reference to Figures 15 to 17 、 Figures 19 to 21When the self-tightening drill chuck is a gear self-tightening drill chuck, the front body 200 comprises a jaw seat 240 which is rotationally arranged on the rear body 100. The jaw seat 240 is provided with a plurality of slide channels which are consistent with the number of the jaws 300, each of the slide channels is symmetrically arranged along the central axis of the front body 200, and each of the slide channels is arranged at an angle with the central axis of the front body 200. Each of the jaws 300 is slidingly arranged in each of the slide channels, and the outer side circumferential surface of each of the jaws 300 is provided with external threads. Meanwhile, a gear groove 241 is formed on the outer side circumferential surface of the jaw seat 240, each of the gear grooves 241 is in communication with each of the slide channels, and the gear groove 241 is used for mounting a driven bevel gear 271 which is threadedly connected with the jaw 300. When the driven bevel gear 271 rotates, it drives the jaw 300 to move along the axial direction of the slide channel. Meanwhile, a driving bevel gear 110 is integrally formed on the bottom circumferential surface of the rear body 100, and each of the driven bevel gears 271 in the gear groove 241 of the jaw seat 240 is in meshing engagement with the driving bevel gear 110 on the rear body 100.

[0076] When the jaw seat 240 rotates in the forward direction relative to the rear body 100, each of the driven bevel gears 271 on the jaw seat 240 rotates under the driving of the driving bevel gear 110 on the rear body 100. Since the driven bevel gear 271 is threadedly connected with the jaw 300, when the driven bevel gear 271 rotates in the forward direction, the jaw 300 moves along the axial direction towards the rear body 100 under the driving of the threads, that is, each of the jaws 300 is clamped to each other. When the jaw seat 240 rotates in the reverse direction relative to the rear body 100, the reverse is true.

[0077] Referring to Figure 2 , Figure 10 , Figure 16 and Figure 20 , the clutch assembly 400 is arranged between the front body 200 and the rear body 100, and is used for controlling the connection state of the front body 200 and the rear body 100, that is, the synchronous rotation state or the relative rotation state between the two.

[0078] Referring to Figure 1 , Figures 3 to 5 , Figure 9 , Figure 11 and Figure 12 , Figure 15 , Figure 17 and Figure 18 , Figure 19 and Figure 21The clutch assembly 400 comprises a ratchet ring 401 fixedly arranged in the circumferential direction of one of the rear body 100 and the front body 200, a plurality of pawls 420 rotatably arranged on the other of the rear body 100 and the front body 200, a resilient member 440 for applying a resilient force to make the pawls 420 abut against the ratchet teeth of the ratchet ring 401, and a separating member 431 arranged on the front body 200 or the rear body 100; the separating member 431 is used to directly or indirectly push the pawls 420 away from the ratchet ring 401, so that the front body 200 can be reversely rotated relative to the rear body 100.

[0079] Specifically, in the following embodiments, the ratchet ring 401 is fixedly arranged in the circumferential direction of the rear body 100, and the pawls 420 are rotatably arranged on the front body 200.

[0080] For example, referring to Figures 9 to 11 , Figures 19 to 21 , the ratchet ring 401 can be directly fixedly arranged on the rear body 100; or referring to Figures 1 to 3 , Figures 15 to 17 , the ratchet ring 401 can also be axially sleeved on the rear body 100.

[0081] Each pawl 420 is rotatably arranged on the end face of the front body 200 close to the rear body 100, and the pawl 420 can be fixedly arranged in the axial direction of the front body 200 or movably arranged in the axial direction of the front body 200. The resilient member 440 connects the front body 200 and the pawl 420, so that when the pawl 420 and the ratchet ring 401 are in the same axial position, the pawl 420 can stably engage with the ratchet ring 401, thereby stabilizing the synchronous rotation state between the front body 200 and the rear body 100, and improving the anti-backout capability of the self-tightening drill chuck.

[0082] The separating member 431 is arranged on the front body 200 or the rear body 100 and can move relative to the front body 200 or the rear body 100, for example, move in the radial direction, move in the axial direction or rotate in the circumferential direction, to directly or indirectly push the pawls 420 away from the ratchet ring 401.

[0083] It can be understood that the pawls 420 and the ratchet ring 401 can be separated in various ways. For example, the pawls 420 and the ratchet ring 401 can be moved relative to each other in the axial direction to be staggered (for example, the ratchet ring 401 is pushed to move in the axial direction, or the pawls 420 are pushed to move in the axial direction) to achieve separation; for another example, the pawls 420 can be rotated relative to the ratchet ring 401 to make the engagement end of the pawls 420 away from the ratchet ring 401.

[0084] When the separating member 431 is arranged to be movable in the radial direction, the separating member 431 can be a wedge, which can push the pawls 420 or the ratchet ring 401 to move in the axial direction to be separated from each other when it moves in the radial direction.

[0085] When the separator 431 is configured to be movable along the axial direction, it can be configured to be of any shape. When it moves along the axial direction, it can push the pawl 420 or the ratchet ring 401 to move axially, either directly or indirectly.

[0086] When the separating member 431 is configured to move circumferentially, it can be block-shaped to directly push the pawl 420 to rotate and thus disengage from the ratchet ring 401; it can also be configured to indirectly push the pawl 420 to move axially, or directly push the ratchet ring 401 to move axially.

[0087] Clutch assembly 400 is configured as follows:

[0088] First, multiple pawls 420 are arranged in an array around the ratchet ring 401, so that each pawl 420 can engage with the ratchet ring 401 synchronously. Compared with the arrangement of only one pawl in related technologies, the meshing force between the front body 200 and the rear body 100 can be provided by multiple pawls 420, thereby greatly improving the stability when the front body 200 and the rear body 100 rotate synchronously, that is, greatly improving the anti-backlash capability of the self-tightening drill chuck.

[0089] Secondly, the ratchet ring 401 is fixedly mounted on the rear body 100 in the circumferential direction, and the pawl 420 is rotatably mounted on the front body 200. Since the rear body 100 is closer to the drive shaft of the driver, it is convenient to disassemble and assemble the self-tightening drill chuck.

[0090] In some embodiments, the ratchet ring 401 is fixedly disposed on the rear body 100, and there are various ways in which it can be disposed.

[0091] In some settings, refer to Figures 9 to 11 , Figures 19 to 21 The ratchet ring 401 is formed on the outer circumferential surface of the rear body 100. With this configuration, the self-tightening drill chuck has fewer parts, and the assembly of its parts is simpler and more convenient.

[0092] In other settings, refer to Figures 1 to 3 , Figures 15 to 17 The clutch assembly 400 also includes a rear sleeve 410 fixedly sleeved on the rear body 100, and a ratchet ring 401 formed on the inner ring wall of the rear sleeve 410. By machining the ratchet ring 401 and the rear body 100 separately, the machining of the ratchet ring 401 and the rear body 100 is simple and convenient, and the yield is easy to control.

[0093] refer to Figures 1 to 4 , Figures 9 to 14 , Figures 15 to 21In some embodiments, the clutch assembly 400 further comprises a switch sleeve 430 rotatably arranged on the front body 200, and a separating piece 431 arranged on the switch sleeve 430; when the switch sleeve 430 is rotated, the separating piece 431 can directly or indirectly push the pawl 420 to disengage from the ratchet ring 401.

[0094] It can be understood that, in the arrangement mode of the self-tightening drill chuck as the flat-jaw self-tightening drill chuck, referring to Figures 1 to 4 、 Figures 9 to 14 , the switch sleeve 430 is rotatably arranged on the outer side circumferential surface of the connecting seat 210; and in the arrangement mode of the self-tightening drill chuck as the gear self-tightening drill chuck, referring to Figures 15 to 21 , the switch sleeve 430 is directly rotatably arranged on the outer side circumferential surface of the jaw seat 240.

[0095] When the separating piece 431 is used to push the ratchet ring 401 to move axially, the separating piece 431 is arranged to have a continuous guide slope in parallel to the radial direction, and a matching structure is arranged on the ratchet ring 401 corresponding to the guide slope; it should be understood that the matching structure is also a slope. When the switch sleeve 430 is rotated, different positions of the guide slope on the separating piece 431 abut against the matching structure on the ratchet ring 401, thereby pushing the ratchet ring 401 to move axially.

[0096] When the separating piece 431 is used to push the pawl 420 to rotate, it can be directly arranged as a block structure.

[0097] When the separating piece 431 is used to push the pawl 420 to move axially, a guide slope can be arranged on the pawl 420 or the separating piece 431, which will be described in detail in the following embodiments.

[0098] By arranging the separating piece 431 on the switch sleeve 430, when it is needed to disengage the pawl 420 from the ratchet ring 401, only the switch sleeve 430 needs to be rotated, which is simple and convenient to operate and does not require other auxiliary tools.

[0099] Specifically, when it is needed to loosen the jaws 300 from each other, the switch sleeve 430 is first rotated to make the separating piece 431 push the pawl 420 to disengage from the ratchet ring 401, and then the front body 200 is reversely rotated to loosen the jaws 300 from each other.

[0100] Referring to Figures 3 to 4 、 Figures 10 to 12 、 Figure 15 、 Figures 18 to 19 、 Figure 21On the basis of the foregoing arrangement of the switch sleeve 430, a cooperating hole 204 capable of cooperating with the crescent wrench is arranged on the outer circumferential surface of the front body 200. In this way, when the switch sleeve 430 pushes the pawl 420 to disengage from the ratchet ring 401, if the clamping jaws 300 in the front body 200 are still difficult to loosen at this time, the crescent wrench can be installed in the cooperating hole 204 to facilitate the rotation of the front body 200, so that the clamping jaws 300 are loosened; similarly, when the switch sleeve 430 pushes the pawl 420 to engage with the ratchet ring 401, the crescent wrench can be installed in the cooperating hole 204 to facilitate the rotation of the front body 200, so that the clamping jaws 300 can be clamped more tightly.

[0101] In particular, with reference to Figures 3 to 4 、 Figures 10 to 12 , in the flat-jaw self-tightening drill chuck, the cooperating hole 204 is arranged on the connecting seat 210; with reference to Figure 15 、 Figures 18 to 19 、 Figure 21 , and in the gear self-tightening drill chuck, the cooperating hole 204 is arranged on the clamping jaw seat 240.

[0102] With reference to Figure 19 and Figure 21 , it should be understood that in some embodiments of the gear self-tightening drill chuck, the outer side wall of the switch sleeve 430 is provided with a through hole 433 capable of communicating with the cooperating hole 204 on the clamping jaw seat 240. When the switch sleeve 430 is rotated to the first position or the second position, the through hole 433 communicates with the cooperating hole 204, so that the crescent wrench can be assembled.

[0103] In some embodiments, a limiting structure is arranged between the front body 200 and the switch sleeve 430, and the limiting structure is used to keep the separating piece 431 in the first position in which the pawl 420 engages with the ratchet ring 401, or in the second position in which the pawl 420 disengages from the ratchet ring 401.

[0104] It can be understood that the limiting structure includes but is not limited to a combination of a groove and a protrusion, a ball socket 202 and a steel ball, etc. By arranging the limiting structure between the front body 200 and the switch sleeve 430, the circumferential position of the front body 200 relative to the rear body 100 can be fixed when the drill is assembled or disassembled, so that the clamping jaws 300 can be kept in the clamped or loosened state, thereby improving the safety of the self-tightening drill chuck.

[0105] With reference to Figure 4 、 Figures 12 to 14 、 Figure 15 and Figure 19In some embodiments, the outer circumferential surface of the precursor 200 is provided with a receiving groove 201 for receiving the separating piece 431 in the circumferential direction. In this way: on the one hand, the receiving groove 201 is used for receiving the separating piece 431, so that after the switch sleeve 430 is rotationally arranged in one body with the precursor 200, the assembly between the precursor 200 and the switch sleeve 430 is more compact; on the other hand, it also makes the switch sleeve 430 able to rotate with the precursor 200 after the separating piece 431 is rotated to abut against the side wall of the receiving groove 201.

[0106] Reference Figure 4 、 Figures 12 to 14 In the flat jaw self-tightening drill chuck, the receiving groove 201 is arranged on the outer circumferential surface of the connecting seat 210 and communicates with the upper end surface of the connecting seat 210; reference Figure 15 and Figure 19 In the gear self-tightening drill chuck, the receiving groove 201 is arranged on the outer circumferential surface of the jaw seat 240 and communicates with the upper end surface of the jaw seat 240.

[0107] Specifically, when the separating piece 431 follows the switch sleeve 430 to rotate forward in the circumferential direction to the first position, the separating piece 431 abuts against the side wall of the receiving groove 201 on the precursor 200, and when the switch sleeve 430 continues to rotate, the switch sleeve 430 pushes the precursor 200 to rotate forward in the circumferential direction together, so that each jaw 300 on the precursor 200 can continue to be clamped under the driving of the precursor 200, thereby preventing the sudden loosening of each jaw 300 and improving the safety of the self-tightening drill chuck.

[0108] Similarly, when the separating piece 431 follows the switch sleeve 430 to rotate reversely in the circumferential direction to the second position, the separating piece 431 abuts against the side wall of the other end of the receiving groove 201 on the precursor 200, and when the switch sleeve 430 continues to rotate, the switch sleeve 430 pushes the precursor 200 to rotate reversely in the circumferential direction together, so that each jaw 300 on the precursor 200 can continue to be loosened under the driving of the precursor 200, thereby enabling each jaw 300 to be fully loosened to facilitate the disassembly of the drill.

[0109] The following will describe the self-tightening drill chuck of the present application in two aspects of embodiments of the separating piece 431 for moving the pawl 420 relative to the ratchet ring 401 in the axial direction and the separating piece 431 for pushing the pawl 420 to rotate relative to the ratchet ring 401.

[0110] Reference Figures 1 to 8 、 Figures 15 to 18 In the first aspect of the embodiment, the separating piece 431 is used for pushing the pawl 420 to move relative to the ratchet ring 401 in the axial direction.

[0111] Reference Figures 1 to 3 、 Figures 15 to 18It can be understood that in the embodiment of the present aspect, the ratchet ring 401 is formed on the inner side wall of the rear sleeve 410, the rear sleeve 410 is fixedly sleeved on the outer side circumferential surface of the rear body 100, and the rear sleeve 410 is in interference fit with the rear body 100.

[0112] Specifically, referring to Figures 1 to 8 In the flat jaw self-tightening drill chuck, the front body 200 further comprises a pawl seat 220, which is arranged in the axial sliding manner on the upper end surface of the connecting seat 210, and the end surface of the connecting seat 210 is provided with a sliding groove 203 in the axial direction, and the pawl seat 220 is arranged in the sliding groove 203 in the axial sliding manner of the connecting seat 210, so that the pawl seat 220 can slide in the axial direction of the connecting seat 210 relative to the connecting seat 210.

[0113] Referring to Figures 15 to 18 In the gear self-tightening drill chuck, the front body 200 comprises a jaw seat 240 and a pawl seat 220, and the pawl seat 220 can move in the axial direction relative to the jaw seat 240.

[0114] It should be understood that referring to Figures 15 to 18 In the gear self-tightening drill chuck, the front body 200 further comprises an end cover 260 fixedly arranged on the upper end surface of the jaw seat 240, and the end cover 260 is provided with a sliding groove 203 in the axial direction of the jaw seat 240, and the pawl seat 220 is arranged in the sliding groove 203 in the axial sliding manner of the jaw seat 240, so that the pawl seat 220 can slide in the axial direction relative to the connecting seat 210. In this way, the machining of the jaw seat 240 is relatively simple and convenient, and the yield is easy to control.

[0115] It can be understood that in the flat jaw self-tightening drill chuck or the gear self-tightening drill chuck, each pawl 420 is arranged in rotation on the end surface of the pawl seat 220, and the separating piece 431 is used to push the pawl seat 220 to slide in the axial direction.

[0116] It can be understood that the pawl seat 220 can be arranged corresponding to each pawl 420, or the pawl seat 220 can be annular, and the pawl seat 220 is provided with a mounting groove for mounting the pawl 420, and each pawl 420 is arranged in rotation in each mounting groove, and the specific manner is not limited thereto. In the following embodiment description, the pawl seat 220 is taken as an example in the annular form.

[0117] The separating piece 431 is used to push the pawl seat 220 to slide in the axial direction, which can be in the axial one-way sliding manner to make the pawl 420 disengage from the ratchet ring 401, or in the axial two-way sliding manner, that is, to make the pawl 420 disengage from the ratchet ring 401 and engage with the ratchet ring 401.

[0118] When the separating piece 431 is used to push the pawl seat 220 to slide in one direction along the axis, a guide slope is arranged on one side end surface of the pawl seat 220, and the separating piece 431 is in a block structure abutting against the guide slope.

[0119] Meanwhile, in the flat jaw self-tightening drill chuck, the reset piece 250 is connected between the connecting seat 210 and the pawl seat 220; and in the gear self-tightening drill chuck, the reset piece 250 is connected between the jaw seat 240 and the pawl seat 220. The guide slope is used to push the pawl seat 220 to slide in the axis direction by the separating piece 431, so that the pawl 420 is disengaged from the ratchet ring 401; and the reset piece 250 is used to drive the pawl seat 220 to slide in the axis direction of the connecting seat 210 or the jaw seat 240 to reset, so that the pawl 420 is engaged with the ratchet ring 401.

[0120] It should be understood that, in the specific application of the gear self-tightening drill chuck, the end cover 260 is fixedly arranged on the end surface of the jaw seat 240, the pawl seat 220 is sleeved on the end cover 260 in the axis direction, and the reset piece 250 is arranged between the end cover 260 and the pawl seat 220. In this way, the reset piece 250 is simple and convenient to assemble.

[0121] In specific applications, referring to Figure 1 and Figure 2 , Figure 4 , Figures 15 to 16 and Figure 18 , the reset piece 250 is a spring. In the flat jaw self-tightening drill chuck, the two ends of the spring are connected with the pawl seat 220 and the connecting seat 210 respectively; and in the gear self-tightening drill chuck, the two ends of the spring are connected with the pawl seat 220 and the end cover 260 respectively.

[0122] When the separating piece 431 is used to push the pawl seat 220 to slide in two directions along the axis, the separating piece 431 is a spiral groove formed on the inner side wall of the switch sleeve 430, and the driven piece arranged on the side wall of the pawl seat 220 is capable of being inserted into the spiral groove. When the switch sleeve 430 rotates, the driven piece on the pawl seat 220 is located at different axial positions of the spiral groove, that is, the pawl seat 220 slides in the axis direction, so as to realize the engagement or disengagement of the pawl 420 and the ratchet ring 401.

[0123] In some embodiments, referring to Figures 5 to 6 , the separating piece 431 and the pawl seat 220 adopt the following cooperation mode.

[0124] That is, the end surface of the pawl seat 220 is provided with a guide groove 221 extending in the circumferential direction, and the groove bottom of the guide groove 221 has a continuously changing depth in the circumferential direction of the pawl seat 220; the separating piece 431 is a rod member formed on the inner side wall of the switch sleeve 430, and at least part of the rod member abuts against the groove bottom of the guide groove 221 and is capable of moving in the circumferential direction relative to the guide groove 221.

[0125] When the switch sleeve 430 rotates, the rod is driven by the switch sleeve 430 to rotate to different circumferential positions, that is, to different positions in the guide groove 221. Since the pawl seat 220 can only move in the axial direction and the guide groove 221 has a continuously changing depth in the circumferential direction, the pawl seat 220 moves in the circumferential direction under the extrusion of the rod, so that the pawl 420 is disengaged from the ratchet ring 401.

[0126] It can be understood that, with reference to Figures 5 to 6 , on the basis of the arrangement of the aforementioned guide groove 221, the aforementioned limiting structure is specifically arranged as follows: a limiting groove 222 is arranged at each end of the guide groove 221, and the limiting groove 222 is a concave arc shape. One limiting groove 222 is arranged corresponding to the first position (that is, the position of 2221 in Figure 6 ), and the other limiting groove 222 is arranged corresponding to the second position (that is, the position of 2222 in Figure 6 ). The limiting groove 222 is used to accommodate the rod.

[0127] By arranging the limiting groove 222 at each end of the guide groove 221, when the rod rotates with the switch sleeve 430 to be clamped in the limiting groove 222, it means that the rod is located at the first position where the pawl 420 engages with the ratchet ring 401, or the rod is located at the second position where the pawl 420 disengages from the ratchet ring 401. Since the limiting groove 222 is a concave arc shape, a certain external force is required for the rod to leave the limiting groove 222, so that the rod can be kept limited in the limiting groove 222 under the action of no external force, so that the pawl 420 and the ratchet ring 401 can be kept at the first position or the second position.

[0128] In some embodiments, with reference to Figure 1 , Figure 4 , Figure 15 and Figure 18 , the elastic member 440 is a torsion spring connected to the pawl seat 220 and the pawl 420.

[0129] In some embodiments, an angle limiting structure is arranged between the pawl seat 220 and the pawl 420, and the angle limiting structure is used to limit the rotation angle of the pawl 420.

[0130] By arranging the angle limiting structure, the pawl 420 can only rotate within the angle range allowed by the angle limiting structure. When the pawl 420 moves in the axial direction to engage with the ratchet ring 401, the pawl 420 can smoothly clamp between two adjacent teeth of the ratchet ring 401, so as to avoid the engagement being not smooth due to the jamming of the teeth and the pawl 420.

[0131] With reference to Figure 1 , Figure 4 , Figure 5 ,Figure 8 、 Figure 15 and Figure 18 In some embodiments, the angle limiting structure comprises a positioning pin 450 arranged on one of the pawl seat 220 and the pawl 420, and a positioning slot 421 arranged on the other one of the pawl seat 220 and the pawl 420 around the rotation axis of the pawl 420, the positioning slot 421 being used for inserting the positioning pin 450 and being arc-shaped.

[0132] In specific applications, referring to Figure 1 、 Figure 4 、 Figure 5 、 Figure 8 、 Figure 15 and Figure 18 the positioning pin 450 is arranged on the pawl seat 220, and the positioning slot 421 is arranged on the pawl 420, the central angle of the positioning slot 421 being the maximum rotation angle of the pawl 420.

[0133] The torsion spring is used to push the pawl 420 to rotate so that the positioning pin 450 abuts against one end of the positioning slot 421, thereby enabling the pawl 420 to maintain a stable meshing connection with the ratchet ring 401 when the pawl 420 and the ratchet ring 401 are in the same axial position.

[0134] Referring to Figures 9 to 14 、 Figures 19 to 21 In some embodiments of the second aspect, the separating piece 431 is used to push the pawl 420 to rotate, thereby separating the pawl 420 from the ratchet ring 401.

[0135] Referring to Figure 9 、 Figures 11 to 14 、 Figure 19 and Figure 21 It can be understood that in the embodiments of the present aspect, the ratchet ring 401 is integrally formed on the outer circumferential surface of the rear body 100; at the same time, the separating piece 431 is a block structure arranged on the inner side ring wall of the switch sleeve 430.

[0136] Referring to Figure 9 、 Figure 11 and Figure 12 In the flat jaw self-tightening drill chuck, the pawl 420 is rotationally arranged on the upper end surface of the connecting seat 210; referring to Figures 19 to 21 In the gear self-tightening drill chuck, the end cover 260 is arranged on the upper end surface of the jaw seat 240, and the pawl 420 is rotationally arranged on the end cover 260.

[0137] Specifically, the middle part of the pawl 420 is rotatably connected to the connecting seat 210 or the end cap 260. The radially inward end of the pawl 420 engages with the ratchet ring 401, and the radially outward end of the pawl 420 abuts against the separating member 431. When the separating member 431 rotates forward in the circumferential direction under the drive of the switch sleeve 430, the separating member 431 abuts against the pawl 420 and pushes the pawl 420 to rotate, thereby disengaging the pawl 420 from the ratchet ring 401. When the separating member 431 rotates backward in the circumferential direction under the drive of the switch sleeve 430, the separating member 431 moves away from the pawl 420, and the pawl 420 returns to the engaged state with the ratchet ring 401 under the elastic pull of the elastic member 440.

[0138] refer to Figure 9 , Figure 11 and Figure 12 ,as well as Figures 19 to 21 In some embodiments, the elastic element 440 is a tension spring connecting the front body 200 and the pawl 420, and each pawl 420 is provided with a corresponding tension spring. Specifically, in the flat pawl self-tightening drill chuck, the tension spring connects the pawl 420 and the connecting seat 210; while in the gear self-tightening drill chuck, the tension spring connects the end cap 260 and the pawl 420.

[0139] refer to Figure 12 In some embodiments, the aforementioned limiting structure is a ball socket 202 provided on the front body 200 corresponding to the first position and the second position, and a ball catcher 432 provided on the switch sleeve 430, the ball catcher 432 being able to be engaged in the ball socket 202.

[0140] By configuring the limiting structure in this way, when the switch sleeve 430 rotates circumferentially to the second position (i.e., the position where the pawl 420 disengages from the ratchet ring 401), the jaws 300 on the front body 200 disengage from each other, allowing for the assembly and disassembly of the drill bit. At this time, the ball bearing 432 on the switch sleeve 430 can be engaged in the ball socket 202, thus keeping the switch sleeve 430 in the second position (i.e., Figure 12 (position 2022 in the middle); when the switch sleeve 430 is reversed circumferentially to the first position (that is, the position where the pawl 420 and the ratchet ring 401 are engaged), the pawls 300 on the front body 200 clamp each other to fix the drill bit. At this time, the ball bearing 432 on the switch sleeve 430 can be locked in the ball socket 202, thus keeping the switch sleeve 430 in the first position (that is, the position 2022 in the middle); when the switch sleeve 430 is reversed circumferentially to the first position (that is, the position where the pawl 420 and the ratchet ring 401 are engaged), the pawls 300 on the front body 200 clamp each other to fix the drill bit. At this time, the ball bearing 432 on the switch sleeve 430 can be locked in the ball socket 202 to keep the switch sleeve Figure 12 (The position of 2021 in the text).

[0141] Understandably, the ball socket 202 and the ball toucher 432 can be configured in the following ways.

[0142] For example, the ball socket 202 can be arranged on the outer circumferential surface of the front body 200 (i.e. the connecting seat 210 of the flat jaw self-tightening drill chuck, and the jaw seat 240 of the gear self-tightening drill chuck), and the impact bead 432 is correspondingly arranged on the inner annular wall of the switch sleeve 430.

[0143] For another example, the ball socket 202 can be arranged on the upper end surface of the front body 200 (i.e. the connecting seat 210 of the flat jaw self-tightening drill chuck, and the end cover 260 of the gear self-tightening drill chuck), and the impact bead 432 is correspondingly arranged on the separation piece 431.

[0144] The above description is merely preferred embodiments of the present application, but not to limit the present application. Any modification, equivalent replacement and improvement made within the principle and spirit of the present application shall fall within the scope of the present application.

Claims

1. A self-tightening drill chuck, characterized by, The application relates to a self-tight drill chuck, comprising: a rear body for being connected to a driving shaft of a driver and rotating synchronously with the driving shaft; wherein the driver is a machine tool, an impact drill or a hand drill; wherein the self-tight drill chuck is a gear self-tight drill chuck or a flat jaw self-tight drill chuck; a front body provided with a plurality of clamping jaws, the front body being connected to the rear body, each of the clamping jaws being capable of clamping a drill tool when the front body rotates in a forward direction with the rear body, and each of the clamping jaws being capable of releasing the drill tool when the front body rotates in a reverse direction relative to the rear body; a clutch assembly comprising a ratchet ring arranged in a ring shape and fixed to one of the rear body and the front body, a plurality of pawls arranged around a central axis of the ratchet ring and rotatably arranged on the other one of the rear body and the front body, an elastic member for applying an elastic force to make the pawls abut against the ratchet of the ratchet ring, and a separating member arranged on the front body or the rear body; the separating member is used for pushing the pawls to disengage from the ratchet ring; wherein the elastic member is a torsion spring or a tension spring; the front body comprises a connecting seat and a pawl seat, the pawl seat being capable of sliding along an axial direction of the connecting seat; each of the pawls is rotatably arranged on an end surface of the pawl seat; the separating member is used for pushing the pawl seat to slide along the axial direction of the connecting seat so as to make the pawls engage with and / or disengage from the ratchet ring; a reset member is connected between the connecting seat and the pawl seat, and is used for pushing the pawl seat to move along the axial direction of the connecting seat so as to make the ratchet keep engaging with the ratchet ring; or the front body comprises a clamping jaw seat and a pawl seat, the pawl seat being capable of sliding along an axial direction of the clamping jaw seat; each of the pawls is rotatably arranged on an end surface of the pawl seat; the separating member is used for pushing the pawl seat to slide along the axial direction of the clamping jaw seat so as to make the pawls engage with and / or disengage from the ratchet ring; a reset member is connected between the clamping jaw seat and the pawl seat, and is used for pushing the pawl seat to move along the axial direction of the clamping jaw seat so as to make the ratchet keep engaging with the ratchet ring. The ratchet ring is formed on an outer circumferential surface of the rear body; or the clutch assembly further comprises a rear sleeve fixedly sleeved on the rear body, and the ratchet ring is formed on an inner circumferential wall of the rear sleeve.

2. The self-tightening chuck as set forth in claim 1, wherein: The clutch assembly further comprises a switch sleeve rotatably arranged on the front body, and the separating member is formed on the switch sleeve; when the switch sleeve rotates, the separating member pushes the pawls to disengage from the ratchet ring.

3. The self-tightening chuck as set forth in claim 2, wherein: An accommodating groove for accommodating the separating member is arranged on an outer circumferential surface of the front body in a circumferential direction; when the separating member is in a first position in which the pawls engage with the ratchet ring or a second position in which the pawls disengage from the ratchet ring, the separating member abuts against two end walls in the circumferential direction of the accommodating groove respectively.

4. The self-tightening chuck as set forth in claim 3, wherein: A limiting structure is arranged between the front body and the switch sleeve, and is used for keeping the separating member in the first position or the second position.

5. The self-tightening chuck as set forth in claim 4, wherein: ​ 6. The self-tightening chuck as set forth in claim 5, wherein: An end cover is fixedly arranged on an end surface of the jaw seat, the pawl seat is axially sleeved on the end cover, and the reset member is arranged between the end cover and the pawl seat.

7. The self-tightening chuck as set forth in claim 1, wherein: The reset member is a spring.

8. The self-tightening chuck as set forth in claim 6, wherein: A guide groove is circumferentially arranged on an end surface of the pawl seat, a groove bottom of the guide groove has a continuously changing depth in the circumferential direction of the pawl seat, and at least part of the separation member abuts against the groove bottom of the guide groove and can move in the circumferential direction relative to the guide groove.

9. The self-tightening chuck as set forth in claim 8, further characterized by: The limiting structure includes limiting grooves respectively formed at two ends of the guide groove, and the limiting grooves are used for accommodating the separation member.

10. The self-tightening chuck as set forth in claim 6, wherein: An angle limiting structure is arranged between the pawl seat and the pawl, and the angle limiting structure is used for limiting a rotation angle of the pawl.

11. The self-tightening chuck as set forth in claim 10, further characterized by: The angle limiting structure includes a positioning pin arranged on one of the pawl seat and the pawl, and an arc-shaped positioning groove arranged on the other one of the pawl seat and the pawl, and the positioning groove is used for inserting the positioning pin.

12. The self-tightening chuck as set forth in claim 5, wherein: The pawl is rotationally arranged on an end surface of the front body, the limiting structure is a ball socket arranged on the front body and corresponding to the first position and the second position, and a bumping ball arranged on the switch sleeve, and the bumping ball can be clamped in the ball socket.

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