CN219188663U

CN219188663U - Self-tightening drill chuck

Info

Publication number: CN219188663U
Application number: CN202320141290.6U
Authority: CN
Inventors: 柳尧亭
Original assignee: Weihai Dawang Machinery Technology Co ltd
Current assignee: Weihai Dawang Machinery Technology Co ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2023-06-16
Anticipated expiration: 2033-01-30

Abstract

The application provides a self-tightening drill chuck, including: the rear body is connected to the driving shaft of the driver and synchronously rotates along with the driving shaft; a front body, wherein a plurality of clamping jaws are arranged, the front body is connected with the rear body, the clamping jaws mutually clamp the drilling tool when the front body rotates forwards along with the rear body, and the clamping jaws mutually unclamp the drilling tool when the front body rotates reversely relative to the rear body; the clutch assembly comprises a ratchet ring which is annular and fixedly arranged with one of the rear body and the front body, a plurality of pawls which are arranged around the central axis of the ratchet ring and are arranged on the other of the rear body and the front body in a unidirectional rotation manner, an elastic piece for applying elastic force to enable the pawls to abut against ratchets on the ratchet ring, and a separating piece arranged on the front body or the rear body; the separating piece is used for pushing the pawl to be separated from the ratchet ring. The self-tightening drill chuck provided by the application has the advantages that the meshing force between the pawl and the ratchet is large, and the stopping capability of the drill chuck is high.

Description

Self-tightening drill chuck

Technical Field

The application belongs to the technical field of mechanical drilling processing, and particularly relates to a self-tightening drill chuck.

Background

The self-tightening drill chuck includes a gear self-tightening drill chuck, a flat claw self-tightening drill chuck, and the like, and generally includes a front body and a rear body that can be switched between a relatively rotating state and a relatively stationary state.

In particular, a plurality of jaws for clamping a drilling tool are provided in the front body, and a clutch assembly is provided between the front body and the rear body. The clutch assembly is a combined structure comprising a pawl, a ratchet ring and a driving piece for driving the ratchet ring to be meshed with or separated from the pawl, namely, the ratchet ring is fixedly arranged on the rear body, and the pawl is rotatably arranged on the front body.

In the clutch assembly, the number of the pawls is limited, and the meshing force between the pawls and the ratchet teeth is limited, so that in the drilling process, when the front body is static relative to the rear body due to larger cutting resistance or the front body is reversed relative to the rear body due to misoperation during assembly of the drilling tool, the pawls are very easy to loosen so as to separate from the ratchet teeth, namely, the stopping capacity of the drill chuck is weak, and the clamping jaw is unstable to the drilling tool.

Disclosure of Invention

The embodiment of the application aims to provide a self-tightening drill chuck, which aims to solve the technical problem that the backstop capability of the drill chuck is weak due to limited meshing force between a pawl and a ratchet in the prior art.

In order to achieve the above object, a technical solution adopted in an embodiment of the present application is to provide a self-tightening drill chuck, which includes:

the rear body is connected to the driving shaft of the driver and synchronously rotates along with the driving shaft;

a front body, wherein a plurality of clamping jaws are arranged, the front body is connected with the rear body, the clamping jaws clamp a drilling tool mutually when the front body rotates along with the rear body in the forward direction, and the clamping jaws loosen the drilling tool mutually when the front body rotates in the reverse direction relative to the rear body;

the clutch assembly comprises a ratchet ring which is annular and fixedly arranged with one of the rear body and the front body, a plurality of pawls which are arranged around the central axis of the ratchet ring and are arranged on the other of the rear body and the front body in a unidirectional rotation way, an elastic piece for applying elastic force to enable the pawls to abut against ratchets on the ratchet ring, and a separating piece arranged on the front body or the rear body; the separator is used for pushing the pawl to be separated from the ratchet ring.

Optionally, the ratchet ring is formed on an outer peripheral 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 annularly arranged on the inner side annular wall of the rear sleeve.

Optionally, the clutch assembly further includes a switch sleeve rotatably disposed on the precursor, and the separating member is formed on the switch sleeve; when the switch sleeve rotates, the separating piece pushes the pawl to be separated from the ratchet ring.

Optionally, a receiving groove for receiving the separator is provided on an outer circumferential surface of the precursor in a circumferential direction; when the separating piece is in a first position where the pawl is meshed with the ratchet ring or in a second position where the pawl is separated from the ratchet ring, the separating piece is respectively abutted with two circumferential end side walls on the accommodating groove.

Optionally, a limit structure is provided between the precursor and the switch sleeve, the limit structure being for holding the separator in the first or second position.

Optionally, the precursor comprises a connecting seat and a pawl seat, and the pawl seat can slide along the axial direction of the connecting seat relative to the connecting seat; each pawl is rotatably arranged on the end face of the pawl seat; the separating piece is used for pushing the pawl seat to slide along the axial direction of the connecting seat so as to enable the pawl to be engaged with and/or disengaged from the ratchet ring.

Optionally, a reset piece is connected between the connecting seat and the pawl seat, and the reset piece is used for pushing the pawl seat to move along the axial direction of the connecting seat so as to enable the ratchet to be in ring-holding engagement with the ratchet.

Optionally, the precursor comprises a jaw seat and a pawl seat, and the pawl seat can slide along the axial direction of the jaw seat relative to the jaw seat; each pawl is rotatably arranged on the end face of the pawl seat; the separator is in an axial sliding motion for pushing the pawl seat along the jaw seat so as to engage and/or disengage the pawl with the ratchet ring.

Optionally, a reset piece is connected between the clamping jaw seat and the pawl seat, and the reset piece is used for pushing the pawl seat to move along the axial direction of the clamping jaw seat so as to enable the ratchet to be in ring-shaped engagement with the ratchet.

Optionally, an end cover is fixedly arranged on the end face of the clamping jaw seat, the pawl seat is axially sleeved on the end cover in a sliding manner, and the reset piece is arranged between the end cover and the pawl seat.

Optionally, the reset element is a spring.

Optionally, a guide groove is circumferentially arranged on the end surface of the pawl seat, and the bottom of the guide groove is provided with a continuously variable depth in the circumferential direction on the pawl seat; at least part of the separating piece is abutted with the bottom of the guide groove and can move along the circumferential direction relative to the guide groove.

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

Optionally, an angle limiting structure is disposed between the pawl seat and the pawl, and the angle limiting structure is used for limiting the rotation angle of the pawl.

Optionally, the angle limiting structure includes a positioning pin disposed on one of the pawl seat and the pawl, and a positioning slot disposed on the other one of the pawl seat and the pawl and having an arc shape, where the positioning slot is used for inserting the positioning pin.

Optionally, the pawl is rotatably disposed on an end surface of the precursor; the limiting structure is a ball socket arranged on the precursor corresponding to the first position and the second position, and a collision bead arranged on the switch sleeve, wherein the collision bead can be clamped in the ball socket.

Optionally, the elastic element is a torsion spring or a tension spring.

Optionally, the self-tightening drill chuck is a gear self-tightening drill chuck or a flat claw self-tightening drill chuck.

The self-tightening drill chuck provided by the embodiment of the application has the following beneficial effects:

a plurality of pawls are rotatably provided on the front body or the rear body around the ratchet ring, and an elastic member for engaging with the ratchet ring is provided corresponding to each pawl. Therefore, when the front body and the rear body need to rotate synchronously, each pawl can keep a stable meshing state with the ratchet ring under the pulling of the elastic piece, so that the stability of the synchronous rotation of the front body and the rear body is improved, the front body can be prevented from being easily reversed relative to the rear body, and the self-tightening drill chuck has strong stopping capability; and when the front body needs to rotate reversely relative to the rear body, the ratchet teeth and the ratchet ring are separated from the meshing state by operating the separating piece, so that the clamping jaw can be loosened.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a flat jaw self-tightening drill chuck in accordance with some embodiments of the present application;

FIG. 2 is a cross-sectional view of the self-tightening drill chuck of the flat jaw of the embodiment of FIG. 1;

FIG. 3 is a perspective view of the self-tightening flat-jaw drill chuck of the embodiment of FIG. 1;

FIG. 4 is an exploded view of the coupling seat and clutch assembly of the embodiment of FIG. 1;

FIG. 5 is a perspective view of a pawl seat in some embodiments of the present application;

FIG. 6 is a perspective view of the embodiment of FIG. 5 showing the first position of the retaining groove and the second position of the retaining groove;

FIG. 7 is a perspective view of a pawl in some embodiments of the present application;

FIG. 8 is a perspective view of a rear sleeve in some embodiments of the present application;

FIG. 9 is an exploded view of a flat jaw self-tightening drill chuck according to further embodiments of the present application;

FIG. 10 is a cross-sectional view of the flat jaw self-tightening drill chuck of the embodiment of FIG. 9;

FIG. 11 is a perspective view of the flat jaw self-tightening drill chuck of the embodiment of FIG. 9;

FIG. 12 is an exploded view of the coupling seat and clutch assembly of the embodiment of FIG. 9;

FIG. 13 is a perspective view of a switch cover in some embodiments of the present application;

FIG. 14 is a perspective view of the switch cover of the embodiment of FIG. 13 from another perspective;

FIG. 15 is an exploded view of a gear self-tightening drill chuck in accordance with some embodiments of the present application;

FIG. 16 is a cross-sectional view of the gear self-tightening drill chuck of the embodiment of FIG. 15;

FIG. 17 is a perspective view of the gear self-tightening drill chuck of the embodiment of FIG. 15;

FIG. 18 is an exploded view of the jaw housing and clutch assembly of the embodiment of FIG. 15;

FIG. 19 is an exploded view of a gear self-tightening drill chuck according to further embodiments of the present application;

FIG. 20 is a cross-sectional view of the gear self-tightening drill chuck of the embodiment of FIG. 19;

fig. 21 is a perspective view of the gear self-tightening drill chuck of the embodiment of fig. 19.

Wherein, each reference sign in the figure:

100. a rear body; 110. a drive bevel gear;

200. a precursor; 201. a receiving groove; 202. a ball socket; 203. a chute; 204. a mating hole;

210. a connecting seat; 220. a pawl seat; 221. a guide groove; 222. a limit groove; 231. pulling nails; 232. a clamping jaw body; 233. a front taper sleeve; 240. a clamping jaw seat; 241. a gear groove; 250. a reset member; 260. an end cap; 271. a driven bevel gear;

300. a clamping jaw;

400. a clutch assembly; 401. a ratchet ring;

410. a rear sleeve; 420. a pawl; 421. a positioning groove; 430. a switch sleeve; 431. a separating member; 432. a ball; 433. a through hole; 440. an elastic member; 450. and (5) positioning pins.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

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

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

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 21, a self-tightening drill chuck according to an embodiment of the present application will be described.

Referring to fig. 1-3, 9-11, 15-17, and 19-21, the self-tightening drill chuck described herein includes a front body 200, a rear body 100, and a clutch assembly 400.

Specifically, the rear body 100 is used to connect to a drive shaft of a driver, which may be a tool such as a machine tool, a percussion drill, or an electric hand drill.

The front body 200 is rotatably provided to the rear body 100, and can maintain a synchronous rotation state or a relative rotation state with the rear body 100, the relative rotation state including forward rotation and reverse rotation.

A plurality of jaws 300 (typically three) are provided in the precursor 200, each jaw 300 being capable of clamping to and unclamping from each other, each jaw 300 being adapted to hold a drilling tool, which may be understood to include, but is not limited to, a drill, a tapping tool, etc.

When the front body 200 rotates forward relative to the rear body 100, the clamping jaws 300 clamp each other so as to tightly clamp the drilling tool; when the front body 200 is inverted relative to the rear body 100, the jaws 300 are released from each other, thereby releasing the drill.

It will be appreciated that the self-tightening drill chuck according to the embodiments of the present application may be a gear self-tightening drill chuck or a flat claw self-tightening drill chuck, with reference to fig. 1 to 3, 9 to 11, 15 to 17, and 19 to 21.

Referring to fig. 1 to 3 and 9 to 11, when the self-tightening drill chuck is a flat jaw self-tightening drill chuck, the precursor 200 includes a connection base 210, a blind rivet 231, a jaw body 232, and a front cone sleeve 233. Wherein:

the connecting seat 210 is sleeved on the outer peripheral surface of the rear body 100 and is rotationally connected with the rear body 100; the external thread is arranged on the outer peripheral surface of the blind rivet 231, a threaded hole is arranged on the bottom surface of the rear body 100, and the blind rivet 231 is in threaded connection with the threaded hole of the rear body 100; clamping jaw bodies 232 are sleeved on the outer sides of the blind nails 231 and are in threaded connection with the connecting seats 210, the clamping jaw bodies 232 and the blind nails 231 are arranged in a relatively fixed mode in the circumferential direction, but can move relatively in the axial direction, clamping jaws 300 are arranged in the clamping jaw bodies 232 in a sliding mode and can slide in the clamping jaw bodies 232 in the axial direction and the radial direction simultaneously, and meanwhile, the tops of the clamping jaws 300 are matched with the blind nails 231 in the sliding mode in the radial direction; the front cone sleeve 233 is screwed with the connection base 210 and encloses the clamping jaw body 232 therein.

When the front body 200 rotates forward relative to the rear body 100, the connecting seat 210, the blind rivet 231, the clamping jaw bodies 232, the clamping jaws 300 and the front taper sleeve 233 rotate synchronously, and as the blind rivet 231 is in threaded connection with the rear body 100, the blind rivet 231 moves along the axial direction close to the top end of the rear body 100 in the forward rotation process, so that the clamping jaws 300 are pulled to move along the radial direction to be close to each other, namely, the clamping jaws 300 clamp each other; the opposite is true when the front body 200 is inverted relative to the rear body 100.

Referring to fig. 15 to 17 and 19 to 21, when the self-tightening drill chuck is a gear self-tightening drill chuck, the front body 200 includes a jaw holder 240, and the jaw holder 240 is rotatably disposed on the rear body 100. The clamping jaw seat 240 is provided with sliding ways with the same number as the clamping jaws 300, the sliding ways are symmetrically arranged along the center of the axis of the precursor 200, the sliding ways are arranged at an included angle with the axis of the precursor 200, each clamping jaw 300 is arranged in each sliding way in a sliding way, and external threads are arranged on the outer peripheral surface of each clamping jaw 300; meanwhile, a gear groove 241 is formed on the outer circumferential surface of the jaw seat 240, each gear groove 241 is communicated with each slideway, the gear groove 241 is used for installing a driven bevel gear 271, the driven bevel gear 271 is in threaded connection with the jaw 300, and when the driven bevel gear 271 rotates, the driven bevel gear 271 drives the jaw 300 to move along the axial direction of the slideway; meanwhile, a drive bevel gear 110 is integrally formed on the bottom peripheral surface of the rear body 100, and each driven bevel gear 271 in the gear groove 241 of the jaw holder 240 is engaged with the drive bevel gear 110 on the rear body 100.

When the jaw holder 240 rotates forward relative to the rear body 100, each driven bevel gear 271 on the jaw holder 240 rotates under the drive of the drive bevel gear 110 of the rear body 100, and since the driven bevel gear 271 is in threaded connection with the jaw 300, when the driven bevel gear 271 rotates forward, the jaw 300 moves in the axial direction close to the rear body 100 under the drive of the threads, that is, each jaw 300 clamps each other; the opposite is true when the jaw mount 240 is inverted relative to the rear body 100.

Referring to fig. 2, 10, 16 and 20, a clutch assembly 400 is provided between the front body 200 and the rear body 100 for controlling a connection state of the front body 200 and the rear body 100, i.e., a synchronous rotation state or a relative rotation state therebetween.

Referring to fig. 1, 3 to 5, 9, 11 and 12, 15, 17 and 18, 19 and 21, the clutch assembly 400 includes a ratchet ring 401 annularly and fixedly disposed in a circumferential direction with one of the rear body 100 and the front body 200, a plurality of pawls 420 rotatably disposed at the other of the rear body 100 and the front body 200 around the array of ratchet rings 401, an elastic member 440 for applying an elastic force to urge the pawls 420 against ratchet teeth on the ratchet ring 401, and a separating member 431 disposed at the front body 200 or the rear body 100; the separator 431 is used to directly or indirectly push the pawls 420 to disengage from the ratchet ring 401 so that the front body 200 can reversely rotate with respect to the rear body 100.

Specifically, in the following embodiments, the ratchet ring 401 is fixedly provided to the rear body 100 in the circumferential direction, and the pawls 420 are rotatably provided to the front body 200.

For example, referring to fig. 9 to 11 and 19 to 21, the ratchet ring 401 may be directly fixedly provided to the rear body 100; alternatively, referring to fig. 1 to 3 and 15 to 17, the ratchet ring 401 may be axially sleeved on the rear body 100.

Each of the pawls 420 is rotatably provided on an end face of the front body 200 adjacent to the rear body 100, and the pawl 420 may be fixedly provided on the front body 200 in the axial direction or may be movably provided on the front body 200 in the axial direction. The elastic member 440 connects the front body 200 and the pawl 420 such that the pawl 420 can be stably engaged with the ratchet ring 401 when the pawl 420 and the ratchet ring 401 are at the same axial position, thereby stabilizing the synchronous rotation state between the front body 200 and the rear body 100 to improve the stopping ability of the self-fastening drill chuck.

A separator 431 is provided to the front body 200 or the rear body 100, which is movable, e.g., radially, axially or circumferentially movable, with respect to the front body 200 or the rear body 100 for directly or indirectly pushing the pawls 420 to disengage from the ratchet ring 401.

It will be appreciated that there are a variety of ways in which the pawl 420 can be disengaged from the ratchet ring 401. For example, it may be that the two are moved relative to each other in the axial direction to be offset from each other (e.g., pushing the ratchet ring 401 to move in the axial direction, or pushing the pawls 420 to move in the axial direction) so as to achieve the disengagement; for another example, it is also possible that the pawl 420 rotates relative to the ratchet ring 401 such that the engagement end of the pawl 420 is away from the ratchet ring 401.

When the separator 431 is provided to be movable in the radial direction, the separator 431 may be a wedge which, when moved in the radial direction, can push the pawls 420 or the ratchet ring 401 to be moved in the axial direction directly or indirectly so as to be disengaged from each other.

When the separator 431 is provided to be movable in the axial direction, it may be provided in any shape, and when it is moved in the axial direction, it can push the pawl 420 or the ratchet ring 401 to be directly or indirectly pushed to be moved in the axial direction.

When the separator 431 is provided to be movable in the circumferential direction, it may be in a block shape for directly pushing the pawl 420 to rotate so as to be disengaged from the ratchet ring 401; it may also be provided for indirectly pushing the pawl 420 to move axially or directly pushing the ratchet ring 401 to move axially.

The clutch assembly 400 is configured as follows:

first, a plurality of pawls 420 are disposed around the array of ratchet rings 401 such that each pawl 420 can be simultaneously engaged with the ratchet ring 401. Compared with the arrangement mode that only one pawl is arranged in the related art, the engaging force between the front body 200 and the rear body 100 can be provided by the pawls 420, so that the stability of the front body 200 and the rear body 100 during synchronous rotation is greatly improved, namely the backstop capability of the self-tightening drill chuck is greatly improved.

Secondly, the ratchet ring 401 is fixedly arranged on the rear body 100 in the circumferential direction, and the pawl 420 is rotatably arranged on the front body 200, so that the rear body 100 is closer to the driving shaft of the driver, and the self-tightening drill chuck can be conveniently assembled and disassembled.

In some embodiments, the ratchet ring 401 is fixedly disposed on the rear body 100, and various manners can be used.

In some arrangements, referring to fig. 9 to 11, 19 to 21, a ratchet ring 401 is formed on the outer peripheral surface of the rear body 100. So set up, the spare part of self-tightening drill chuck is less, and its each spare part assembly is comparatively simple and convenient.

In yet other arrangements, referring to fig. 1-3 and 15-17, the clutch assembly 400 further includes a rear sleeve 410 fixedly sleeved on the rear body 100, and the ratchet ring 401 is formed on an inner annular wall of the rear sleeve 410. By processing and forming the ratchet ring 401 and the rear body 100 respectively, the ratchet ring 401 and the rear body 100 are processed and formed respectively, and the finished product rate is easy to control.

Referring to fig. 1-4, 9-14, and 15-21, in some embodiments, the clutch assembly 400 further includes a switch sleeve 430 rotatably disposed on the front body 200, and the separator 431 is disposed on the switch sleeve 430; when the switch cover 430 is rotated, the separator 431 can directly or indirectly push the pawl 420 to be separated from the ratchet ring 401.

It can be understood that, in the arrangement mode that the self-tightening drill chuck is a flat claw self-tightening drill chuck, referring to fig. 1 to 4 and fig. 9 to 14, the switch sleeve 430 is rotatably disposed on the outer peripheral surface of the connection seat 210; in the arrangement where the self-tightening drill chuck is a gear self-tightening drill chuck, referring to fig. 15 to 21, the switch sleeve 430 is directly rotatably disposed on the outer circumferential surface of the jaw holder 240.

When the separating member 431 is used to push the ratchet ring 401 to move in the axial direction, the separating member 431 is configured to have a continuous guiding slope parallel to the radial direction, and at the same time, a mating structure is also provided on the ratchet ring 401 corresponding to the guiding slope, and it should be understood that the mating structure is also in a slope shape. When the switch cover 430 rotates, different positions of the guide inclined surface on the separating member 431 are abutted with the matching structure on the ratchet ring 401, so that the ratchet ring 401 is pushed to move axially.

When the separating member 431 is used to push the pawl 420 to rotate, it is simply provided in a block structure.

When the separator 431 is used to push the pawl 420 to move in the axial direction, a guide slope may be provided on the pawl 420 or the separator 431, which will be described in detail in the following embodiments.

By arranging the separating member 431 on the switch cover 430, when the pawl 420 is required to be separated from the ratchet ring 401, only the switch cover 430 is required to be rotated, and the operation is simple and convenient without other auxiliary tools.

Specifically, when it is desired to release the jaws 300 from each other, the switch sleeve 430 is rotated so that the separator 431 pushes the pawl 420 to be separated from the ratchet ring 401, and then the precursor 200 is rotated in the opposite direction to release the jaws 300 from each other.

Referring to fig. 3 to 4, 10 to 12, 15, 18 to 19, and 21, in addition to the above-described arrangement of the switch cover 430, an engagement hole 204 capable of engaging with a crescent wrench is provided in the outer peripheral surface of the front body 200. Thus, when the switch sleeve 430 pushes the pawls 420 to disengage from the ratchet ring 401, if the jaws 300 in the front body 200 are still difficult to release at this time, a crescent wrench can be installed in the mating hole 204 to facilitate rotation of the front body 200, so that the jaws 300 are released; similarly, when the switch sleeve 430 pushes the pawls 420 into engagement with the ratchet ring 401, a crescent wrench can be installed in the mating hole 204 to facilitate rotation of the front body 200, so that the jaws 300 can grip each other more tightly.

Specifically, referring to fig. 3 to 4 and 10 to 12, in the flat jaw self-tightening drill chuck, the fitting hole 204 is provided on the connection base 210; referring to fig. 15, 18-19 and 21, in the gear self-tightening drill chuck, the mating hole 204 is disposed on the jaw seat 240.

Referring to fig. 19 and 21, it will be appreciated 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 that can be in communication with the mating hole 204 on the jaw mount 240. When the switch housing 430 is rotated to the first position or the second position, the through hole 433 communicates with the fitting hole 204, thereby enabling the crescent wrench to be assembled.

In some embodiments, a limit structure is provided between the precursor 200 and the switch sleeve 430 for maintaining the separator 431 in a first position engaging the pawl 420 with the ratchet ring 401 or in a second position disengaging the pawl 420 from the ratchet ring 401.

It is understood that the limit structure includes, but is not limited to, a combination of a groove and a bump, a ball socket 202 and a steel ball, etc. By providing a spacing 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 and disassembled, so that the clamping jaw 300 can be maintained in a clamped or unclamped state to improve the safety of the self-tightening drill chuck.

Referring to fig. 4, 12 to 14, 15 and 19, in some embodiments, a receiving groove 201 for receiving the separator 431 is provided in the circumferential direction at the outer circumferential surface of the precursor 200. This is the case: on the one hand, the accommodating groove 201 is used for accommodating the separating member 431, so that the assembly between the front body 200 and the switch sleeve 430 is more compact after the switch sleeve 430 and the front body 200 are rotatably arranged in a whole; on the other hand, the switch cover 430 can be rotated together with the precursor 200 after the separating member 431 is rotated to abut against the side wall of the accommodating groove 201.

Referring to fig. 4 and 12 to 14, in the flat jaw self-tightening drill chuck, a receiving groove 201 is provided on an outer circumferential surface of a connection base 210 and communicates with an upper end surface of the connection base 210; referring to fig. 15 and 19, in the gear self-tightening drill chuck, the accommodation groove 201 is provided on the outer circumferential surface of the jaw holder 240 and communicates with the upper end surface of the jaw holder 240.

Specifically, when the separating member 431 rotates forward along the circumferential direction to the first position along with the switch sleeve 430, the separating member 431 abuts against the side wall of the accommodating groove 201 on the front body 200, and when the switch sleeve 430 continues to rotate, the switch sleeve 430 pushes the front body 200 to rotate forward along the circumferential direction together, so that each clamping jaw 300 on the front body 200 can be continuously clamped under the driving of the front body 200, and thus each clamping jaw 300 can be prevented from suddenly loosening, and the safety of the self-tightening drill chuck is improved.

Similarly, when the separating member 431 rotates around the switch sleeve 430 to the second position, the separating member 431 abuts against the side wall of the other end of the accommodating 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 around the second position, so that the clamping jaws 300 on the precursor 200 can be continuously loosened under the driving of the precursor 200, and the clamping jaws 300 can be fully loosened, so that the assembly and disassembly of the drilling tool are facilitated.

The self-tightening drill chuck of the present application will be described in detail below in terms of two embodiments in which the separator 431 is used to move the pawl 420 axially relative to the ratchet ring 401, and the separator 431 is used to urge the pawl 420 to rotate relative to the ratchet ring 401.

Referring to fig. 1 to 8 and 15 to 18, in the embodiment of the first aspect, the separator 431 is used to push the pawls 420 to move axially with respect to the ratchet ring 401.

Referring to fig. 1 to 3 and 15 to 18, it can be appreciated that in the present embodiment, the ratchet ring 401 is formed on an inner annular wall of the rear case 410, the rear case 410 is fixedly sleeved on an outer circumferential surface of the rear body 100, and the rear case 410 is in interference fit with the rear body 100.

Specifically, referring to fig. 1 to 8, in the flat jaw self-tightening drill chuck, the precursor 200 further includes a pawl holder 220, the pawl holder 220 is slidably disposed on an upper end surface of the connection holder 210 in an axial direction, a sliding groove 203 is axially disposed on an end surface of the connection holder 210, and the pawl holder 220 is slidably disposed in the sliding groove 203 in the axial direction of the connection holder 210, so that the pawl holder 220 can slide along the axial direction of the connection holder 210 relative to the connection holder 210.

Referring to fig. 15 to 18, in the gear self-tightening drill chuck, the precursor 200 includes a jaw holder 240 and a pawl holder 220, and the pawl holder 220 is axially movable with respect to the jaw holder 240.

It should be understood that, referring to fig. 15 to 18, in the gear self-tightening drill chuck, the precursor 200 further includes an end cover 260 fixedly disposed on an upper end surface of the jaw holder 240, a sliding groove 203 is disposed on the end cover 260 along an axial direction of the jaw holder 240, and the pawl holder 220 is slidably disposed in the sliding groove 203 along the axial direction of the jaw holder 240, so that the pawl holder 220 can slide along the axial direction relative to the connection holder 210. Thus, the machining and forming of the clamping jaw seat 240 are simple and convenient, and the yield is easy to control.

It will be appreciated that, either in a flat-jaw self-tightening drill chuck or a gear self-tightening drill chuck, each pawl 420 is rotatably disposed on an end face of the pawl seat 220; the separating member 431 is used to push the pawl seat 220 to slide in the axial direction.

It will be appreciated that the pawl seat 220 may be provided for each pawl 420; alternatively, the pawl seat 220 may be annular, and the pawl seat 220 is provided with a mounting groove for mounting the pawl 420, and each pawl 420 is rotatably disposed in each mounting groove, which is not limited thereto. In the following description of the embodiments, the pawl seat 220 is exemplified by a ring shape.

The separator 431 is used to push the pawl seat 220 to slide axially, which may be a unidirectional axial slide to disengage the pawl 420 from the ratchet ring 401; or may slide axially in both directions, i.e., disengage the pawl 420 from the ratchet ring 401 and engage the pawl 420 with the ratchet ring 401.

When the separating member 431 is used for pushing the pawl seat 220 to slide in one direction along the axial direction, a guiding inclined plane is disposed on one side end surface of the pawl seat 220, and the separating member 431 has a block structure abutting against the guiding inclined plane.

Meanwhile, in the flat claw self-tightening drill chuck, a reset piece 250 is connected between the connection seat 210 and the pawl seat 220; in the gear self-tightening drill chuck, a reset member 250 is connected between the jaw housing 240 and the pawl housing 220. The guide inclined surface is used for the separating piece 431 to push the pawl seat 220 to axially slide so as to separate the pawl 420 from the ratchet ring 401; and the reset member 250 is used to drive the pawl holder 220 to slide along the axial direction of the connection holder 210 or the jaw holder 240 so as to reset, so that the pawl 420 is engaged with the ratchet ring 401.

It should be understood that, in the specific application of the gear self-tightening drill chuck, in the case that the end cover 260 is fixedly disposed on the end surface of the jaw seat 240, the pawl seat 220 is slidably sleeved on the end cover 260 in the axial direction, and the reset member 250 is disposed between the end cover 260 and the pawl seat 220. In this way, the assembly of the reset member 250 is simple and convenient.

In a specific application, referring to fig. 1 and 2, fig. 4, fig. 15-16 and fig. 18, the return member 250 is a spring. In the flat claw self-tightening drill chuck, two ends of a spring are respectively connected with a pawl seat 220 and a connecting seat 210; in the gear self-tightening drill chuck, the two ends of the spring are connected to the pawl seat 220 and the end cap 260, respectively.

When the separating member 431 is used for pushing the pawl seat 220 to slide along the axial direction, the separating member 431 is a spiral groove formed on the inner annular wall of the switch sleeve 430, and a driven member capable of being inserted into the spiral groove is disposed on the side wall of the pawl seat 220. When the switch sleeve 430 is rotated, the driven member on the pawl seat 220 is located at a different axial position of the helical groove, i.e., the pawl seat 220 slides axially, thereby effecting engagement or disengagement of the pawl 420 with the ratchet ring 401.

In some embodiments, referring to fig. 5-6, the following illustrated engagement is employed between the separator 431 and the pawl seat 220.

Namely: a guide groove 221 is formed on the end surface of the pawl seat 220 in a circumferential direction in an extending manner, and the groove bottom of the guide groove 221 has a continuously variable depth in the circumferential direction on the pawl seat 220; the separating member 431 is a rod formed on the inner circumferential wall of the switch sleeve 430, at least part of the rod is abutted against the bottom of the guide groove 221 and can move circumferentially relative to the guide groove 221.

When the switch sleeve 430 rotates, the rod rotates to different circumferential positions, that is, to different positions in the guide groove 221 under the driving of the switch sleeve 430, and the pawl seat 220 moves circumferentially under the extrusion of the rod due to the fact that the pawl seat 220 can only move axially and the guide groove 221 has a continuously variable depth in the circumferential direction, so that the pawl 420 is separated from the ratchet ring 401.

It can be understood that, referring to fig. 5 to 6, on the basis of the arrangement of the guide groove 221, the specific arrangement manner of the above-mentioned limiting structure is as follows: the two ends of the guiding groove 221 are provided with limiting grooves 222, the limiting grooves 222 are in a concave arc shape, one limiting groove 222 is arranged corresponding to a first position (namely a position 2221 in fig. 6), and the other limiting groove 222 is arranged corresponding to a second position (namely a position 2222 in fig. 6); the limiting groove 222 is used for accommodating the rod.

By providing the limiting grooves 222 at both ends of the guiding groove 221, when the rod member following the switch sleeve 430 rotates to be clamped in the limiting grooves 222, the rod member is located at the first position where the pawl 420 is engaged with the ratchet ring 401, or the rod member is located at the second position where the pawl 420 is disengaged from the ratchet ring 401. Because the limiting groove 222 is in a concave arc shape, the rod piece needs a certain external force when leaving the limiting groove 222, so that the rod piece can be kept limited in the limiting groove 222 under the action of no external force, and the pawl 420 and the ratchet ring 401 can be kept in the first position or the second position.

In some embodiments, referring to fig. 1, 4, 15 and 18, the resilient member 440 is a torsion spring connecting the pawl seat 220 and the pawl 420.

In some embodiments, an angular limiting structure is provided between the pawl seat 220 and the pawl 420 for limiting the rotational angle of the pawl 420.

Through setting up angle limit structure for pawl 420 can only rotate in the angle within range that angle limit structure allowed, when pawl 420 axially moved to with ratchet ring 401 engaged with, pawl 420 can smoothly block into between two adjacent ratchets on ratchet ring 401, in order to avoid ratchet and pawl 420 to block and lead to the meshing unsmooth.

Referring to fig. 1, 4, 5, 8, 15 and 18, in some embodiments, the angle limiting structure includes a positioning pin 450 disposed on one of the pawl seat 220 and the pawl 420, and a positioning groove 421 disposed on the other of the pawl seat 220 and the pawl 420 around a rotation axis of the pawl 420, where the positioning groove 421 is configured to allow the positioning pin 450 to be inserted and arc-shaped.

In a specific application, referring to fig. 1, 4, 5, 8, 15 and 18, the positioning pin 450 is disposed on the pawl seat 220, the positioning slot 421 is disposed on the pawl 420, and the central angle of the positioning slot 421 is the maximum rotation angle of the pawl 420.

The torsion spring is used for pushing the pawl 420 to rotate so that the positioning pin 450 abuts against one end of the positioning groove 421, and therefore when the pawl 420 and the ratchet ring 401 are located at the same axial position, the pawl 420 can keep a stable meshed connection relationship with the ratchet ring 401.

Referring to fig. 9-14, 19-21, in some embodiments of the second aspect, a separator 431 is used to urge the pawl 420 to rotate, thereby separating the pawl 420 from the ratchet ring 401.

Referring to fig. 9, 11 to 14, 19 and 21, it can be understood that in the present embodiment, the ratchet ring 401 is integrally formed on the outer peripheral surface of the rear body 100; meanwhile, the separating member 431 is a block structure disposed on an inner circumferential wall of the switch housing 430.

Referring to fig. 9, 11 and 12, in the flat jaw self-tightening drill chuck, a pawl 420 is rotatably provided at an upper end surface of the connection base 210; referring to fig. 19 to 21, in the gear self-tightening drill chuck, an end cover 260 is provided on an upper end surface of the jaw holder 240, and a pawl 420 is rotatably provided on the end cover 260.

Specifically, the middle portion of the pawl 420 is rotatably connected to the connecting base 210 or the end cap 260, and the radially inward end of the pawl 420 engages the ratchet ring 401, and the radially outward end of the pawl 420 is configured to abut the separator 431. When the separating member 431 rotates forward in the circumferential direction under the driving of the switch sleeve 430, the separating member 431 can abut against the pawl 420 and push the pawl 420 to rotate so that the pawl 420 is separated from the ratchet ring 401; when the separating member 431 is rotated reversely in the circumferential direction by the switch cover 430, the separating member 431 is separated from the pawl 420, and the pawl 420 is pulled by the elastic force of the elastic member 440 to restore the engaged state with the ratchet ring 401.

Referring to fig. 9, 11 and 12, and 19 to 21, in some embodiments, the elastic member 440 is a tension spring connecting the precursor 200 and the pawls 420, and each pawl 420 is provided with a tension spring. Specifically, in the flat jaw self-tightening drill chuck, the tension spring connects the pawl 420 and the connection base 210; in the gear self-tightening drill chuck, the tension spring connects the end cap 260 and the pawl 420.

Referring to fig. 12, in some embodiments, the aforementioned limiting structure is a ball socket 202 disposed at the front body 200 corresponding to the first position and the second position, and a ball 432 disposed at the switch sleeve 430, where the ball 432 can be snapped into the ball socket 202.

By arranging the limit structure in such a way, when the switch sleeve 430 rotates forward in the circumferential direction to the second position (i.e., the position where the pawls 420 are disengaged from the ratchet ring 401), the clamping jaws 300 on the front body 200 are mutually released to enable the drilling tool to be assembled and disassembled, and at this time, the latching beads 432 on the switch sleeve 430 can be clamped in the ball sockets 202 to keep the switch sleeve 430 in the second position (i.e., the position 2022 in fig. 12); when the switch sleeve 430 is circumferentially reversed to a first position (i.e., where the pawls 420 engage the ratchet ring 401), the jaws 300 on the precursor 200 grip each other to secure the drill, and the ball 432 on the switch sleeve 430 can then snap into the socket 202 to retain the switch sleeve 430 in the first position (i.e., 2021 in fig. 12).

It will be appreciated that the ball socket 202 and the ball 432 may be arranged as follows.

For example, the ball socket 202 may be disposed on an outer peripheral surface of the front body 200 (i.e., the connection base 210 of the flat-jaw self-tightening drill chuck and the jaw base 240 of the gear self-tightening drill chuck), and the bump 432 is correspondingly disposed on an inner annular wall of the switch sleeve 430.

For another example, the ball socket 202 may be disposed on an upper end surface of the precursor 200 (i.e., the connection base 210 of the flat-jaw self-tightening drill chuck and the end cap 260 of the gear self-tightening drill chuck), and the bump 432 may be disposed on the separating member 431 correspondingly.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims

1. A self-tightening drill chuck, comprising:

2. The self-tightening drill chuck of claim 1, wherein: the ratchet ring is formed on the outer peripheral 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 annularly arranged on the inner side annular wall of the rear sleeve.

3. The self-tightening drill chuck of claim 2, wherein: the clutch assembly further comprises a switch sleeve rotatably arranged on the precursor, and the separating piece is formed on the switch sleeve; when the switch sleeve rotates, the separating piece pushes the pawl to be separated from the ratchet ring.

4. A self-tightening drill chuck as in claim 3, wherein: a receiving groove for receiving the separating member is provided in the circumferential direction on the outer circumferential surface of the precursor; when the separating piece is in a first position where the pawl is meshed with the ratchet ring or in a second position where the pawl is separated from the ratchet ring, the separating piece is respectively abutted with two circumferential end side walls on the accommodating groove.

5. The self-tightening drill chuck of claim 4, wherein: a spacing structure is provided between the precursor and the switch sleeve for maintaining the separator in the first or second position.

6. The self-tightening drill chuck of claim 5, wherein: the precursor comprises a connecting seat and a pawl seat, wherein the pawl seat can slide along the axial direction of the connecting seat relative to the connecting seat; each pawl is rotatably arranged on the end face of the pawl seat; the separating piece is used for pushing the pawl seat to slide along the axial direction of the connecting seat so as to enable the pawl to be engaged with and/or disengaged from the ratchet ring.

7. The self-tightening drill chuck of claim 6, wherein: a reset piece 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 enable the ratchet to be meshed with the ratchet ring.

8. The self-tightening drill chuck of claim 5, wherein: the precursor comprises a clamping jaw seat and a pawl seat, wherein the pawl seat can slide relative to the clamping jaw seat along the axial direction of the clamping jaw seat; each pawl is rotatably arranged on the end face of the pawl seat; the separator is used for pushing the pawl seat to slide along the axial direction of the clamping jaw seat so as to enable the pawl to be engaged with and/or disengaged from the ratchet ring.

9. The self-tightening drill chuck of claim 8, wherein: a reset piece 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 enable the ratchet to be meshed with the ratchet ring.

10. The self-tightening drill chuck of claim 9, wherein: an end cover is fixedly arranged on the end face of the clamping jaw seat, the pawl seat is axially sleeved on the end cover in a sliding mode, and the reset piece is arranged between the end cover and the pawl seat.

11. The self-tightening drill chuck according to claim 7 or 9, wherein: the reset piece is a spring.

12. A self-tightening drill chuck according to any one of claims 6 to 10, wherein: a guide groove is formed in the end face of the pawl seat along the circumferential direction, and the bottom of the guide groove is provided with a continuously variable depth in the circumferential direction of the pawl seat; at least part of the separating piece is abutted with the bottom of the guide groove and can move along the circumferential direction relative to the guide groove.

13. The self-tightening drill chuck of claim 12, wherein: the limiting structure comprises limiting grooves which are formed at two ends of the guide groove respectively, and the limiting grooves are used for accommodating the separating pieces.

14. A self-tightening drill chuck according to any one of claims 6 to 10, wherein: an angle limiting structure is arranged between the pawl seat and the pawl and used for limiting the rotating angle of the pawl.

15. The self-tightening drill chuck of claim 14, wherein: the angle limiting structure comprises a locating pin arranged on one of the pawl seat and the pawl, and a locating groove which is arc-shaped and is arranged on the other one of the pawl seat and the pawl, and the locating groove is used for inserting the locating pin.

16. The self-tightening drill chuck of claim 5, wherein: the pawl is rotatably arranged on the end face of the precursor; the limiting structure is a ball socket arranged on the precursor corresponding to the first position and the second position, and a collision bead arranged on the switch sleeve, wherein the collision bead can be clamped in the ball socket.

17. The self-tightening drill chuck of claim 1, wherein: the elastic piece is a torsion spring or a tension spring.

18. The self-tightening drill chuck of claim 1, wherein: the self-tightening drill chuck is a gear self-tightening drill chuck or a flat claw self-tightening drill chuck.