CN208800797U - Drill chuck - Google Patents

Abstract

The utility model provides a kind of drill chuck, and drill chuck includes: drill body；Gripping portions are arranged in drill body, are provided with external screw thread on the outer wall of clamping jaw；The outside of drill body is arranged in locking member, and locking member is provided with internal screw thread, locking member and clamping jaw by being threadedly engaged so that clamping jaw is movably disposed in drill body；The outside of institute's locking member is arranged in driving assembly, and driving assembly is for driving locking member to rotate；Driving assembly is arranged between shell and locking member, and shell drives locking member rotation so that clamping jaw moves in drill body by driving assembly；For locking structure between shell and clamping jaw, locking structure has lockup state and evacuation state, and when locking structure is in lockup state, locking structure drives clamping jaw mobile for limiting driving assembly, to prevent the further clamp or release of clamping jaw.By technical solution provided by the utility model, it is able to solve the technical issues of self-locking can occur for drill chuck in the prior art in drilling.

Description

Drill chuck

Technical field

The utility model relates to drill chuck technical fields, in particular to a kind of drill chuck.

Background technique

Currently, drill chuck in the prior art can prevent drill chuck in drilling the case where clamping jaw loosening, so that drill point Head can work normally.But it is easy to cause clamping jaw the more to press from both sides the more tight using this drill chuck, in this way, after drilling, it will not Convenient for unclamping clamping jaw with more bit change.Therefore, self-locking situation is easy to happen using drill chuck in the prior art, is not easy to work Make the operation of personnel.

Utility model content

The utility model provides a kind of drill chuck, and self-locking can occur to solve drill chuck in the prior art in drilling The problem of.

The utility model provides a kind of drill chuck, and drill chuck includes: drill body；Clamping jaw, part are arranged in drill body, clamping jaw It is movably disposed in drill body and clamps and unclamp to realize, be provided with external screw thread on the outer wall of clamping jaw；Locking member, locking member are set It sets in the outside of drill body, locking member is provided with internal screw thread, and locking member is with clamping jaw by being threadedly engaged so that clamping jaw is movably set It sets in drill body；The outside of institute's locking member is arranged in driving assembly, and driving assembly is for driving locking member to rotate；Shell bores Body, clamping jaw, locking member and driving assembly are respectively provided with inside the shell, and driving assembly is arranged between shell and locking member, and shell is logical Component of overdriving drives locking member rotation so that clamping jaw moves in drill body；Locking structure is arranged inside the shell, and locking structure Between shell and clamping jaw, locking structure has lockup state and evacuation state, when locking structure is in lockup state, lock Only structure drives clamping jaw mobile for limiting driving assembly, to prevent the further clamp or release of clamping jaw.

Further, locking structure includes tooth-shape structure and clamping structure, and clamping structure is arranged on driving assembly, clamping Structure have lock position and evacuation position, when locking structure is in lockup state, clamping structure be in lock position with tooth Shape structure cooperation limits the rotation of driving assembly, when locking structure be in evacuation state, clamping structure be in avoid position with Driving assembly is set smoothly locking member to be driven to rotate.

Further, tooth-shape structure includes: the first tooth-shape structure, and the first tooth-shape structure includes multiple first tooth form units, First tooth form unit includes the first tooth and the second tooth, and the first tooth has the first inclined-plane and the second inclined-plane, and the second tooth has third oblique Face and the 4th inclined-plane, the first inclined-plane, the second inclined-plane, third inclined-plane and the 4th inclined-plane are sequentially connected setting, the length on the 4th inclined-plane Greater than the length on the second inclined-plane.

Further, tooth-shape structure includes: the second tooth-shape structure, and the second tooth-shape structure includes multiple third teeth, and adjacent two There is interval between a third tooth.

Further, the screw pitch of clamping jaw and the screw thread of locking member cooperation is T, and the number of teeth of tooth-shape structure is Z, 0.021 < T/Z ≤0.03。

Further, tooth-shape structure is outer toothing, and tooth-shape structure is arranged on the outer wall of drill body.

Further, driving assembly includes: sleeve, and inside the shell, sleeve is set in the outside of locking member, locking member for setting It is interference fit with sleeve, elastic component is arranged in sleeve, and elastic component part is pierced by sleeve and abuts with the inner wall of shell, Clamping structure is set on elastic component, and shell drives locking member to rotate by sleeve.

Further, the first groove, the second groove, third groove and the 4th have been sequentially arranged in the circumferential direction. on the inner wall of shell Groove, the first groove are connect with the second groove arc, groove depth of the groove depth less than the first groove of the second groove, third groove and Four groove intervals are arranged, and first through hole and the second through-hole are provided on sleeve, and elastic component has the first protrusion, the second protrusion and stops Baffle, the first protrusion are arranged in first through hole, and the second protrusion is arranged in the second through-hole, and stop tab forms clamping structure, when First protrusion setting is arranged in the second groove, the second protrusion in four grooves, and clamping structure is in lock position, when first convex It plays setting to be arranged in the first groove, the second protrusion in third groove, clamping structure is in evacuation position.

Further, drill chuck further include: supporting element, inside the shell and positioned at the lower section of locking member, supporting element is used for setting In support locking member.

Further, drill chuck further include: bearing is arranged inside the shell and between supporting element and locking member.

Using the technical solution of the utility model, by the way that locking structure is arranged between shell and clamping jaw, when the locking knot When structure is in lockup state, locking structure drives clamping jaw mobile for limiting shell by driving assembly, to prevent clamping jaw into one Clamp or release is walked, had not only been avoided that drill chuck clamping jaw in drilling loosened in this way, but also be avoided that drill chuck folder in drilling There is a situation where the more press from both sides the more tight pawl.Therefore, using the technical solution of the utility model, it is able to solve drill chuck in the prior art The technical issues of self-locking occurring in drilling.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model. In the accompanying drawings:

Fig. 1 shows the structural schematic diagram of drill chuck provided by the utility model；

Fig. 2 shows the structural schematic diagrams of clamping jaw provided by the utility model；

Fig. 3 shows the main view of clamping jaw provided by the utility model；

Fig. 4 shows the structural schematic diagram of sleeve provided by the utility model；

Fig. 5 shows the structural schematic diagram of elastic component provided by the utility model；

Fig. 6 shows the structural schematic diagram of driving assembly provided by the utility model；

Fig. 7 shows the side view of driving assembly provided by the utility model；

Fig. 8 shows the structural schematic diagram of shell provided by the utility model；

The locking structure that Fig. 9 shows the drill chuck with the first tooth-shape structure provided by the utility model is in evacuation shape Structural schematic diagram when state；

The locking structure that Figure 10 shows the drill chuck with the first tooth-shape structure provided by the utility model is in locking The structural schematic diagram that stop tab is abutted with the first inclined-plane when state；

Figure 11 shows the local signal amplification figure in Figure 10；

The locking structure that Figure 12 shows the drill chuck with the first tooth-shape structure provided by the utility model is in locking Stop tab is located at the structural schematic diagram at the 4th inclined-plane when state；

Figure 13 shows the local signal amplification figure in Figure 12；

The locking structure that Figure 14 shows the drill chuck with the second tooth-shape structure provided by the utility model is in evacuation Structural schematic diagram when state；

The locking structure that Figure 15 shows the drill chuck with the second tooth-shape structure provided by the utility model is in locking Structural schematic diagram when state；

Figure 16 shows the local signal amplification figure in Figure 15；

Locking member is arranged far from Figure 17 shows the first tooth-shape structure provided by the utility model and close to clamping jaw side Drill chuck；

Figure 18 shows the drill chuck that the first tooth-shape structure provided by the utility model is positioned close at locking member；

Figure 19 shows the first tooth-shape structure provided by the utility model and is arranged far from locking member and far from clamping jaw side Drill chuck.

Wherein, the above drawings include the following reference numerals:

10, drill body；20, clamping jaw；30, locking member；40, shell；41, the first groove；42, the second groove；43, third is recessed Slot；44, the 4th groove；51, the first tooth-shape structure；52, the second tooth-shape structure；61, sleeve；62, elastic component；621, first is convex It rises；622, the second protrusion；623, stop tab；70, supporting element；80, bearing；90, rear cover；100, front cover；110, circlip.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to this is practical Novel and its application or any restrictions used.Based on the embodiments of the present invention, those of ordinary skill in the art are not having Every other embodiment obtained under the premise of creative work is made, is fallen within the protection scope of the utility model.

As shown in Figure 1, the utility model embodiment provides a kind of drill chuck, the drill chuck include: drill body 10, clamping jaw 20, Locking member 30, driving assembly, shell 40 and locking structure.Wherein, 20 part of clamping jaw is arranged in drill body 10, and clamping jaw 20 is removable Ground, which is arranged in drill body 10, to be clamped and unclamps to realize, is provided with external screw thread on the outer wall of clamping jaw 20.The setting of locking member 30 is being bored The outside of body 10, locking member 30 are provided with internal screw thread, locking member 30 and clamping jaw 20 by being threadedly engaged so that clamping jaw 20 is removable Ground is arranged in drill body 10.The outside of institute's locking member 30 is arranged in driving assembly, and driving assembly is for driving locking member 30 to rotate. Drill body 10, clamping jaw 20, locking member 30 and driving assembly are arranged in shell 40, and driving assembly is arranged in shell 40 and locking member Between 30, shell 40 drives the rotation of locking member 30 so that clamping jaw 20 moves in drill body 10 by driving assembly.Locking structure is set It sets in shell 40, and locking structure, between shell 40 and clamping jaw 20, locking structure has lockup state and evacuation state, When locking structure is in lockup state, locking structure drives clamping jaw 20 mobile for limiting driving assembly, to prevent clamping jaw 20 Further clamp or release.Locking member 30 in the present embodiment can be screw.

Using drill chuck provided in this embodiment, by the way that locking structure is arranged between shell 40 and clamping jaw 20, when the lock When only structure is in lockup state, locking structure drives clamping jaw 20 mobile for limiting shell 40 by driving assembly, to prevent The further clamp or release of clamping jaw 20 had not only been avoided that drill chuck clamping jaw 20 in drilling loosened in this way, but also has been avoided that drill point In drilling, there is a situation where the more press from both sides the more tight clamping jaw 20 head.Therefore, it using the technical solution of the utility model, is able to solve existing The technical issues of self-locking can occur for the drill chuck in technology in drilling.

Specifically, locking structure includes tooth-shape structure and clamping structure, clamping structure is arranged on driving assembly, clamping knot Structure has lock position and evacuation position.When locking structure is in lockup state, clamping structure be in lock position with tooth Shape structure cooperates to limit the rotation of driving assembly；When locking structure is in evacuation state, clamping structure is in evacuation position So that driving assembly can smoothly drive locking member 30 to rotate.

Specifically, tooth-shape structure includes the first tooth-shape structure 51, the first tooth-shape structure 51 includes multiple first tooth form units, First tooth form unit includes the first tooth and the second tooth, and the first tooth has the first inclined-plane and the second inclined-plane, and the second tooth has third oblique Face and the 4th inclined-plane, the first inclined-plane, the second inclined-plane, third inclined-plane and the 4th inclined-plane are sequentially connected setting, the length on the 4th inclined-plane Greater than the length on the second inclined-plane.Wherein, the first inclined-plane and third inclined-plane are used to prevent clamping jaw 20 from unclamping, the second inclined-plane and the 4th Inclined-plane is used to prevent 20 self-locking of clamping jaw.

Specifically, the second inclined-plane and the 4th inclined-plane of corresponding length can be arranged according to actual working condition, so that should Tooth-shape structure plays the effect of good anti-self-locking.Brill is worked as using drill chuck provided in this embodiment using such setting When collet works in the case where lower severity vibration, clamping structure cannot cross the second inclined-plane, will not occur so self-locking Tight situation.When the working strength of drill chuck reaches certain value, clamping structure will extend over the second inclined-plane, but not cross the 4th Self-locking phenomenon will not occur in this way for inclined-plane.

Specifically, tooth-shape structure include the second tooth-shape structure 52, the second tooth-shape structure 52 include multiple third teeth, adjacent two There is interval between a third tooth.Using such setting, clamping structure passes through the interval between two neighboring third tooth It cooperates, can either prevent clamping jaw 20 from loosening in this way, and 20 self-locking of clamping jaw can be prevented.

As shown in Figures 2 and 3, the screw pitch for the screw thread that clamping jaw 20 and locking member 30 cooperate is T, and the number of teeth of tooth-shape structure is Z, 0.021 T/Z≤0.03 <.Using such setting, can be better played by the reasonable number of teeth of setting prevents self-locking Effect.When the number of teeth is smaller, such that the chamfer length of each tooth increases, or the distance at interval can be made larger.This Sample, when drill chuck, which drills, to be vibrated, although certain movement can occur under the influence of vibration for shell 40 and sleeve 61, at this point, if The length on the second inclined-plane and the 4th inclined-plane be respectively provided with it is longer, clamping structure can with tooth-shape structure cooperate play preferably prevent from The effect of locking, but clamping structure is likely to the middle part in the second inclined-plane or the 4th inclined-plane at this time, clamping structure will not In stable mated condition, that is, it is not easy to the abutting of clamping structure and the first inclined-plane and third inclined-plane, cannot thus stablized Play the effect for preferably preventing self-locking in ground.If the length on the first inclined-plane and third inclined-plane be respectively provided with it is longer, in this way will be unfavorable In the abutting of clamping structure and the first inclined-plane and third inclined-plane, the effect stable against loosening cannot be played.

In the present embodiment, tooth-shape structure is outer toothing, and tooth-shape structure is arranged on the outer wall of drill body 10.

As shown in Figures 4 to 7, in order to preferably drive the rotation of locking member 30, the driving assembly in the present embodiment includes: Sleeve 61 and elastic component 62.Wherein, sleeve 61 is arranged in shell 40, and sleeve 61 is set in the outside of locking member 30, locking member 30 be to be interference fitted with sleeve 61, so that sleeve 61 is able to drive the rotation of locking member 30.Elastic component 62 is arranged in sleeve 61, and 62 part of elastic component is pierced by sleeve 61 and abuts with the inner wall of shell 40.Clamping structure is provided on elastic component 62, shell 40 is logical Crossing sleeve 61 drives locking member 30 to rotate.

As shown in figure 8, it is recessed to be sequentially arranged in the circumferential direction. the first groove 41, the second groove 42, third on the inner wall of shell 40 Slot 43 and the 4th groove 44.42 circular sliding slopes of first groove 41 and the second groove, the groove depth of the second groove 42 is less than the first groove 41 groove depth, third groove 43 and the 4th groove 44 interval are arranged.First through hole and the second through-hole are provided on sleeve 61, elasticity Part 62 has first the 621, second protrusion 622 of protrusion and stop tab 623.First protrusion 621 is arranged in first through hole, and second is convex It plays 622 to be arranged in the second through-hole, the preferably band moving sleeve 61 of elastic component 62 can in this way rotated.Stop tab 623 forms card Binding structure, when 621 setting of the first protrusion is arranged in the second protrusion of groove 42, second 622 in four grooves 44, clamping structure by To the power towards tooth-shape structure direction, clamping structure is matched with tooth-shape structure so that clamping structure is in lock position, when One protrusion, 621 setting is arranged in first the 41, second protrusion of groove 622 in third groove 43, and clamping structure is in evacuation position. The first groove 41 in the present embodiment can be connected with the second groove 42 by arc section.

As shown in figure 9, the structure is the drill chuck with the first tooth-shape structure 51, when installing drill bit, at clamping structure In evacuation position, shell 40 is turned, shell 40 will drive elastic component 62 to move, while sleeve 61 will drive locking member 30 to rotate. As shown in FIG. 10 and 11, after drill chuck has clamped drill bit, continue to turn shell 40, when the torsion that shell 40 is subject to is greater than the When the deformation force of one protrusion 621, the first protrusion 621 will move in the second groove 42 from the first groove 41, and correspondingly second is convex The 4th groove 44 will be moved to by third groove 43 by playing 622, at this point, clamping structure is in lock position, complete lock in this way The process of tight drill bit.

When using have the first tooth-shape structure 51 drill chuck, when drill bit at work, shell 40 is affected by vibrations It can move, by the cooperation of clamping structure and tooth-shape structure, can either prevent drill chuck from loosening, can also prevent drill chuck Self-locking.Specifically, stop tab 623 will not loosen under the withstanding effect on the first inclined-plane and third inclined-plane, Tu10He Structural schematic diagram when stop tab 623 is abutted with the first inclined-plane is shown in Figure 11.Stop tab 623 is oblique on the second inclined-plane and the 4th Self-locking will not occur under the action of face, show the structure that stop tab 623 is located in the middle part of the 4th inclined-plane in Figure 12 and Figure 13 Schematic diagram the occurrence of avoiding self-locking, further avoids self-locking since stop tab 623 can not cross the 4th inclined-plane It is next to be not easy to unclamp clamping jaw 20.

As shown in figure 14, which is the drill chuck with the second tooth-shape structure 52, when installing drill bit, at clamping structure In evacuation position, shell 40 is turned, shell 40 will drive elastic component 62 to move, while sleeve 61 will drive locking member 30 to rotate. As shown in figs, after drill chuck has clamped drill bit, continue to turn shell 40, when the torsion that shell 40 is subject to is greater than the When the deformation force of one protrusion 621, the first protrusion 621 will move in the second groove 42 from the first groove 41, and correspondingly second is convex The 4th groove 44 will be moved to by third groove 43 by playing 622.At this point, stop tab 623 will be located at the interval of two neighboring third tooth Place, clamping structure are in lock position, complete the process of locking drill bit in this way.

When using have the second tooth-shape structure 52 drill chuck, when drill bit at work, shell 40 is affected by vibrations It can move, by the cooperation of clamping structure and tooth-shape structure, can either prevent drill chuck from loosening, can also prevent drill chuck Self-locking.Specifically, since the interval of two neighboring third tooth is arranged in stop tab 623, in this way, when shell 40 is due to vibration When moving, stop tab 623 will be vibrated in the interval of two neighboring third tooth, but due to by two neighboring The barrier effect of three teeth can be avoided stop tab 623 and cross the two adjacent third teeth, further avoid drill chuck Loosening or self-locking phenomenon.

In the present embodiment, drill chuck further includes supporting element 70, and supporting element 70 is arranged in shell 40 and is located at locking member 30 lower section, supporting element 70 are used to support locking member 30.Supporting element 70 in the present embodiment can be steel pad.

In order to rotate locking member 30 preferably, the drill chuck in the present embodiment further includes bearing 80, and bearing 80 is arranged In shell 40 and between supporting element 70 and locking member 30.

Drill chuck in the present embodiment further includes having rear cover 90, front cover 100 and circlip 110, one end of rear cover 90 and shell 40 connections, the other end of rear cover 90 are connect with drill body 10.One end of the separate rear cover of shell 40, front cover 100 is arranged in front cover 100 It is made of metal material, certain protection and positioning action can be played.

Specifically, tooth-shape structure can be arranged according to the actual situation at the different location of drill body 10, to meet difference Use demand.It is as shown in Figures 17 to 19 the drill chuck with the first tooth-shape structure 51, Figure 17 to Figure 19 is respectively illustrated First tooth-shape structure 51 is arranged at the different location of drill body 10.The first tooth-shape structure 51 is shown in Figure 17 is arranged far from lock Tight part 30 and the case where close to 20 side of clamping jaw, shows the feelings that the first tooth-shape structure is positioned close at locking member in Figure 18 Condition shows the first tooth-shape structure 51 in Figure 19 and is arranged far from locking member 30 and the case where far from 20 side of clamping jaw.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.

Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments Up to the unlimited the scope of the utility model processed of formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each shown in attached drawing The size of a part is not to draw according to actual proportionate relationship.For skill known to person of ordinary skill in the relevant Art, method and apparatus may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as awarding Weigh part of specification.In shown here and discussion all examples, any occurrence should be construed as merely example Property, not as limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar Label and letter similar terms are indicated in following attached drawing, therefore, once be defined in a certain Xiang Yi attached drawing, then with In attached drawing afterwards do not need that it is further discussed.

In the description of the present invention, it should be understood that the noun of locality such as " front, rear, top, and bottom, left and right ", " laterally, Vertically, vertically, it is horizontal " and " pushing up, bottom " etc. indicated by orientation or positional relationship be normally based on orientation or position shown in the drawings Relationship is set, is merely for convenience of describing the present invention and simplifying the description, in the absence of explanation to the contrary, these nouns of locality Do not indicate that and imply that signified device or element must have a particular orientation or be constructed and operated in a specific orientation, because This should not be understood as the limitation to scope of protection of the utility model；The noun of locality " inside and outside " refers to the wheel relative to each component itself Wide is inside and outside.

For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ", " ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction " Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and " in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and And respective explanations are made to the opposite description in space used herein above.

In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this The limitation of utility model protection range.

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of drill chuck, which is characterized in that the drill chuck includes:

Drill body (10)；

Clamping jaw (20), in the drill body (10), the clamping jaw (20) is movably disposed at the drill body (10) for part setting It is interior to clamp and unclamp to realize, external screw thread is provided on the outer wall of the clamping jaw (20)；

Locking member (30), the locking member (30) are arranged in the outside of the drill body (10), and the locking member (30) is provided with interior Screw thread, the locking member (30) and the clamping jaw (20) are by being threadedly engaged so that the clamping jaw (20) is movably disposed at institute It states in drill body (10)；

Driving assembly, setting is in the outside of institute's locking member (30), and the driving component is for driving the locking member (30) to rotate；

Shell (40), the drill body (10), the clamping jaw (20), the locking member (30) and the driving component are arranged at institute It states in shell (40), the driving component is arranged between the shell (40) and the locking member (30), the shell (40) Drive the locking member (30) rotation so that the clamping jaw (20) moves in the drill body (10) by the driving component；

Locking structure, setting is in the shell (40), and the locking structure is located at the shell (40) and the clamping jaw (20) between, the locking structure has lockup state and evacuation state, when the locking structure is in the lockup state, The locking structure drives the clamping jaw (20) mobile for limiting the driving component, to prevent the clamping jaw (20) further Clamp or release.

2. drill chuck according to claim 1, which is characterized in that the locking structure includes tooth-shape structure and clamping knot Structure, the clamping structure are arranged in the driving component, and the clamping structure has lock position and evacuation position, the lock When only structure is in the lockup state, the clamping structure is in the lock position and is limited with cooperating with the tooth-shape structure The rotation of the driving component processed, when the locking structure is in the evacuation state, the clamping structure is in the evacuation Position is so that the driving component can smoothly drive locking member (30) to rotate.

3. drill chuck according to claim 2, which is characterized in that the tooth-shape structure includes:

First tooth-shape structure (51), first tooth-shape structure (51) include multiple first tooth form units, the first tooth form list Member includes the first tooth and the second tooth, and first tooth has the first inclined-plane and the second inclined-plane, and second tooth has third inclined-plane With the 4th inclined-plane, first inclined-plane, second inclined-plane, the third inclined-plane and the 4th inclined-plane are sequentially connected setting, The length on the 4th inclined-plane is greater than the length on second inclined-plane.

4. drill chuck according to claim 2, which is characterized in that the tooth-shape structure includes:

Second tooth-shape structure (52), second tooth-shape structure (52) include multiple third teeth, the two neighboring third tooth it Between have interval.

5. drill chuck according to claim 3 or 4, which is characterized in that the clamping jaw (20) is matched with the locking member (30) The screw pitch of the screw thread of conjunction is T, and the number of teeth of the tooth-shape structure is Z, 0.021 T/Z≤0.03 <.

6. drill chuck according to claim 2, which is characterized in that the tooth-shape structure is outer toothing, the tooth form knot Structure is arranged on the outer wall of the drill body (10).

7. drill chuck according to claim 6, which is characterized in that the driving component includes:

Sleeve (61), in the shell (40), the sleeve (61) is set in the outside of the locking member (30), described for setting Locking member (30) and the sleeve (61) are interference fit；

Elastic component (62), setting in the sleeve (61), and the elastic component (62) be partially pierced by the sleeve (61) and with The inner wall of the shell (40) abuts, and the clamping structure is arranged on the elastic component (62), and the shell (40) passes through described Sleeve (61) drives locking member (30) rotation.

8. drill chuck according to claim 7, which is characterized in that be sequentially arranged in the circumferential direction. on the inner wall of the shell (40) Have the first groove (41), the second groove (42), third groove (43) and the 4th groove (44), first groove (41) with it is described Second groove (42) circular sliding slopes, the groove depth of second groove (42) are less than the groove depth of first groove (41), and described the Three grooves (43) and the 4th groove (44) interval are arranged, and are provided with first through hole and the second through-hole on the sleeve (61), The elastic component (62) has first raised (621), second raised (622) and stop tab (623), described first raised (621) It is arranged in the first through hole, described second raised (622) are arranged in second through-hole, stop tab (623) shape At the clamping structure, when described first raised (621) setting is set in second groove (42), second raised (622) It sets at the 4th groove (44), the clamping structure is in the lock position, when described first raised (621) setting exists First groove (41), described second raised (622) are arranged at third groove (43), and the clamping structure is in institute State evacuation position.

9. drill chuck according to claim 1, which is characterized in that the drill chuck further include:

Supporting element (70) is arranged in the shell (40) and is located at the lower section of the locking member (30), the supporting element (70) It is used to support the locking member (30).

10. drill chuck according to claim 9, which is characterized in that the drill chuck further include:

Bearing (80), setting is in the shell (40) and between the supporting element (70) and the locking member (30).