CN220178200U - Drill chuck - Google Patents

Abstract

The present disclosure relates to the field of power tools, and more particularly, to a drill chuck. Comprising the following steps: the drill body, clamping jaw movably set up in the drill body in order to realize pressing from both sides tightly and unclamping to the processing tool, and the clamping jaw is close to one side of processing tool and is equipped with the margin, and the margin includes first clamping part and second clamping part, is formed with step structure on the margin. The working tool in the present disclosure has a cylindrical portion at the front end and a polygonal portion at the rear end. The outer diameter sizes of the front end cylinder and the rear end polygon of tools with different specifications are different, and the axial lengths of the rear end polygons are inconsistent. Through forming the cascaded structure on the clamping jaw margin, the cascaded structure of margin and the cascaded structure of processing tool can gomphosis, can effectively prevent that processing tool from taking place to skid at the course of working and become flexible to improve the reliability and the commonality of drill chuck.

Description

Drill chuck

Technical Field

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

Background

With the improvement of life quality, the use of electric tools for multifunctional work is increasing, for example, the electric tools are used for processing by using tools such as drill chucks for mounting flat shovels, screw taps and the like, but the clamping parts of part of the tools are different from common drills, and the clamping parts of the tools consist of front-end cylindrical structures and rear-end polygonal structures, so that the clamping parts are diversified. Because the clamping rear end of the tool adopts a polygonal structure, the effective clamping length of the cutting edges of the clamping jaws of the drill chuck is reduced, and thus the clamping reliability is reduced. In order to ensure that the electric tool is reliably clamped in use, the electric tool is prevented from slipping relative to the clamping part in the working process and cannot work normally, higher working efficiency is pursued, abrasion waste is reduced, and the electric tool is a new research direction in the field of drill chucks.

Disclosure of Invention

In order to solve the technical problems, the present disclosure provides a drill chuck.

The present disclosure provides a drill chuck comprising:

a drill body;

clamping jaw, the clamping jaw is movably set up in the brill body in order to realize pressing from both sides tightly and unclamping to the processing tool, the clamping jaw is close to one side of processing tool is equipped with the margin, the margin includes first clamping part and second clamping part, be formed with step structure on the margin.

Optionally, the first clamping portion and the second clamping portion are arranged in parallel, and the height of the first clamping portion is smaller than that of the second clamping portion.

Optionally, the ratio of the length of the second clamping portion to the total length of the margin is greater than or equal to 15% and less than or equal to 30%.

Optionally, when the number of the drill chuck jaws is two, a difference in height between the first grip portion and the second grip portion is 0.2mm or more and 0.5mm or less.

Optionally, when the number of the drill chuck jaws is three, a difference in height between the first grip portion and the second grip portion is 0.1mm or more and 0.3mm or less.

Optionally, the drill bit further comprises a locking piece, wherein the locking piece is sleeved on the periphery of the clamping jaw, the locking piece is provided with internal threads, and the clamping jaw is matched with the locking piece through threads so that the clamping jaw is movably arranged in the drill bit body;

the drill body, the locking piece and the clamping jaw are all arranged in the shell.

Optionally, the locking device further comprises a supporting piece, wherein the supporting piece is arranged in the shell and is used for supporting the locking piece; and the bearing is arranged in the accommodating space formed by the locking piece and the supporting piece.

Optionally, a radial cross-section of the jaw at the margin is a scalloped configuration.

Optionally, the shell includes a front sleeve and a rear sleeve, the front sleeve is disposed at an end close to the processing tool, the rear sleeve is disposed at an end far away from the processing tool, and the front sleeve and the rear sleeve jointly form a space for accommodating the drill body, the locking member and the clamping jaw.

Optionally, the locking piece is matched with the front sleeve, the front sleeve rotates to drive the locking piece to rotate, and the locking piece drives the clamping jaw to move.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the present disclosure provides a drill chuck comprising: the drill body, the clamping jaw, clamping jaw part setting is in the drill body, clamping jaw movably sets up in the drill body in order to realize pressing from both sides tightly and unclamping to the processing tool, and the clamping jaw is close to one side of processing tool and is equipped with the margin, and the margin includes first clamping part and second clamping part, is formed with step structure on the margin. The drill chuck clamping jaw cutting edge is arranged to be of a two-section ladder-shaped structure and comprises the first clamping part and the second clamping part, so that the tool can be effectively prevented from rotating, slipping and loosening during working. The machining tools with different specifications have different outer diameter sizes of the front end cylinder and the rear end polygon, the axial lengths of the rear end polygons are inconsistent, and the machining tools can be effectively prevented from slipping and loosening in the working process by reasonably selecting the length of the clamping jaw cutting edge and the height difference of the clamping jaw cutting edge of the drill chuck, so that the reliability and the universality of the drill chuck are improved, the working efficiency is improved, and the waste in the machining process is prevented.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a cross-sectional view of a drill chuck holding tap according to an embodiment of the disclosure;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a cross-sectional view of a drill chuck holding tap with a second holding portion having a length of 0% of the total length of the margin according to an embodiment of the disclosure;

FIG. 4 is an enlarged view of FIG. 3 at B;

FIG. 5 is a cross-sectional view of a drill chuck holding tap with a second holding portion having a length less than 15% of the total length of the margin according to an embodiment of the disclosure;

FIG. 6 is an enlarged view of FIG. 5 at C;

FIG. 7 is a cross-sectional view of a drill chuck holding tap with a second holding portion having a length greater than 30% of the total length of the margin according to an embodiment of the disclosure;

FIG. 8 is an enlarged view of FIG. 7 at D;

FIG. 9 is an overall block diagram of a drill chuck according to an embodiment of the present disclosure;

FIG. 10 is a cross-sectional view taken at E-E of FIG. 9;

FIG. 11 is a cross-sectional view taken at F-F in FIG. 9;

fig. 12 is an overall block diagram of a jaw according to an embodiment of the present disclosure.

Wherein, 1, a drill body; 2. a clamping jaw; 21. a margin; 211. a first clamping part; 212. a second clamping portion; 3. a machining tool; 4. a locking member; 5. a housing; 51. a front sleeve; 52. a rear sleeve; 6. a support; 7. and (3) a bearing.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.

The present disclosure provides a drill chuck comprising: a drill body 1; the clamping jaw 2 is movably arranged in the drill body 1 to clamp and unclamp the processing tool 3, one side of the clamping jaw 2 close to the processing tool 3 is provided with a cutting edge 21, the cutting edge 21 comprises a first clamping part 211 and a second clamping part 212, and a stepped structure is formed on the cutting edge 21.

In this embodiment, the machining tool 3 is usually a flat spade, a tap or the like, and since the machining tool 3 has a cylindrical portion at the front end and a polygonal portion at the rear end, the stepped structure of the margin 21 and the stepped structure of the machining tool 3 can be engaged by forming the stepped structure on the margin 21, so that slipping and loosening of the machining tool 3 during operation can be effectively prevented, and the reliability and versatility of the drill chuck can be improved.

In particular to the margin 21, as shown in fig. 1, 2 and 12, the first clamping portion 211 and the second clamping portion 212 are disposed in parallel, and the height of the first clamping portion 211 is smaller than the height of the second clamping portion 212 to form a stepped structure. Wherein the first clamping portion 211 is used for clamping a cylindrical portion of the processing tool 3 and the second clamping portion 212 is used for clamping a polygonal portion of the processing tool 3. It should be noted that the first clamping portion 211 and the second clamping portion 212 are disposed in parallel, including an absolute parallel arrangement and an approximately parallel arrangement.

In this embodiment, the ratio of the length of the first clamping portion 211 to the total length of the margin 21 is greater than or equal to 15% and less than or equal to 30%, so as to ensure the best clamping effect, improve the anti-rotation performance of the drill chuck for clamping a specific tool, and effectively maintain the clamping torque of the drill chuck. The longer the second clamping portion 212 is within a certain range, the lower the machining cost and the better the clamping effect, but the longer the second clamping portion 212 is beyond a certain range, the too short the length of the first clamping portion 211 may result, thereby reducing the clamping reliability of the drill chuck. Fig. 3-8 are schematic illustrations of the ratio of the first clamping length to the total length of the margin 21 ranging from 0%, 15% and 30%, respectively. Setting different values for the ratio of the length of the second clamping part 212 of the drill chuck to the total length of the cutting edge 21, counting 10 groups of M4-M13 taps respectively clamped by the drill chuck, counting the number of taps reliably clamped by the drill chuck in the process of machining 100 threaded holes of each tap, and recording as B; the above test is performed by selecting a drill chuck having a second clamping portion 212 of the drill chuck accounting for 0% of the total length of the margin 21, counting the number of reliable clamping taps of the drill chuck, and recording as a. Through researches, the reliable clamping rate of the drill chuck at different length ratios is 1=b/a. As shown in table 1:

TABLE 1 reliable clamping Rate 1 for drill chucks with different length ratios

Also in the present embodiment, it is necessary to limit the difference in height between the first clamping portion 211 and the second clamping portion 212, and if the difference in height is too large, there may be a case where the second clamping portion 212 has clamped the polygonal portion of the processing tool 3, but the first clamping portion 211 has not been in contact with the cylindrical portion of the processing tool 3; if the height difference is too small, the torsion resistance of the holding jaw 2 is poor, and the intended effect cannot be achieved. In order to determine a proper height difference range, under the condition that the second clamping part 212 occupies a certain total length ratio of the cutting edge 21, different values are set for the height difference of the cutting edge 21 of the clamping jaw 2 of the drill chuck, 10 groups of M4-M13 taps are respectively clamped by the drill chuck, the number of taps reliably clamped by the drill chuck in the process of machining 100 threaded holes of each tap is counted, and the number is marked as C; the test is performed by selecting a drill chuck with the second clamping portion 212 of the drill chuck accounting for 0% of the total length ratio of the cutting edge 21 of the clamping jaw 2, and the number of reliable clamping taps of the drill chuck is counted and marked as A. Through researches, the reliable clamping rate 2=C/A of the drill chuck under different height differences is obtained. As shown in table 2, the clamping reliability 2 is obtained by the difference in height between the margins 21 of the two clamping jaws 2, and thus, when the number of the clamping jaws 2 of the drill chuck is two, the difference in height between the first clamping portion 211 and the second clamping portion 212 is 0.2mm or more and 0.5mm or less can be defined, thereby increasing the number of effective clamping cycles of the drill chuck.

Table 2 reliable clamping rate 2 of drill chuck under different height differences of two-jaw drill chuck margins

As described above, when the number of the jaws 2 is three, it was studied to obtain a reliable grip rate 2=c/a of the drill chuck at different height differences. As shown in table 3, for the clamping reliability 2 of the three clamping jaws 2, the difference in height between the first clamping portion 211 and the second clamping portion 212 is defined to be 0.1mm or more and 0.3mm or less when the drill chuck has three clamping jaws 2, so as to ensure reliable clamping and versatility of the product.

Table 3 reliable clamping rate 2 of drill chuck under different height differences of three-jaw drill chuck margins

Further, the drill bit further comprises a locking piece 4, the locking piece 4 is sleeved on the periphery of the clamping jaw 2, the locking piece 4 is provided with internal threads, and the clamping jaw 2 and the locking piece 4 are matched through threads so that the clamping jaw 2 can be movably arranged in the drill bit body 1; the casing 5, the drill body 1, the locking member 4 and the clamping jaw 2 are all arranged in the casing 5. The rotation of the locking member 4 along the clamping jaw 2 can drive the clamping jaw 2 to move along the axial direction of the locking member 4, so that the clamping jaw of the drill chuck can be opened and closed. Also in this embodiment, there is a housing 5, the housing 5 having the function of protecting the internal components.

Still further, a support 6 is also included, the support 6 being provided in the housing 5, and the support 6 being for supporting the lock 4. Specifically, the support 6 in the present embodiment may be a steel pad. Also included are bearings 7, the bearings 7 being arranged in the accommodation space formed by the locking member 4 and the support member 6, the bearings 7 being arranged for better rotation of the locking member 4.

In this embodiment, the radial cross section of the jaw 2 at the margin 21 is a fan-shaped structure. As shown in fig. 9 to 11, when the number of the drill chuck jaws is 3, the drill chuck grips the working tool. Fig. 10 shows the second clamping portion of the clamping jaw in contact with the polygonal portion of the machining tool, wherein only two of the 3 clamping jaws are in contact with the machining tool. Fig. 11 shows the first clamping portion of the clamping jaw in contact with the cylindrical portion of the working tool. Furthermore, the fan-shaped structure can enable the contact position of the cutting edge 21 and the processing tool 3 to be in a line, so that the contact area is minimized, the pressure intensity is maximized, and the clamping reliability of the clamping jaw 2 on the processing tool 3 is improved.

Specifically, to the housing, the housing 5 includes a front case 51 and a rear case 52, the front case 51 being disposed at an end close to the processing tool 3, the rear case 52 being disposed at an end remote from the processing tool 3, the front case 51 and the rear case 52 together forming a space for accommodating the drill body 1, the locking member 4, and the holding jaw 2. The front sleeve 51, the drill body 1 and the rear sleeve 52 in this embodiment are coaxially arranged, and the front sleeve 51 and the rear sleeve 52 can jointly provide a protective function for the drill body 1, the locking member 4 and the clamping jaw 2.

In this embodiment, the locking member 4 is matched with the front sleeve 51, and the front sleeve 51 rotates to drive the locking member 4 to rotate, and the locking member 4 drives the clamping jaw 2 to move. The specific working principle is as follows: after the components are mounted in place, the front sleeve 51 is rotated to drive the locking piece 4 to rotate, and the locking piece 4 rotates along the clamping jaw 2 to drive the clamping jaw 2 to move along the axial direction of the locking piece 4, so that the clamping jaw 1 of the drill chuck is opened and closed. It should be noted that the clamping jaw having this structure and/or size requirement is equally applicable to wrenches, self-tightening drill chucks.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown and described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A drill chuck, comprising:

a drill body (1);

clamping jaw (2), clamping jaw (2) movably set up in order to realize pressing from both sides tight and unclamping to processing instrument (3) in the drilling body (1), clamping jaw (2) are close to one side of processing instrument (3) is equipped with margin (21), margin (21) are including first clamping part (211) and second clamping part (212), be formed with step structure on the margin (21).

2. The drill chuck according to claim 1, characterized in that the first clamping portion (211) and the second clamping portion (212) are arranged in parallel, the height of the first clamping portion (211) being smaller than the height of the second clamping portion (212).

3. The drill chuck according to claim 1, characterized in that the ratio of the length of the second clamping portion (212) to the total length of the margin (21) ranges from 15% or more to 30% or less.

4. The drill chuck according to claim 1, characterized in that when the number of the clamping jaws (2) is two, the difference in height between the first clamping portion (211) and the second clamping portion (212) is greater than or equal to 0.2mm and less than or equal to 0.5mm.

5. The drill chuck according to claim 1, characterized in that when the number of the clamping jaws (2) is three, the difference in height between the first clamping portion (211) and the second clamping portion (212) is 0.1mm or more and 0.3mm or less.

6. The drill chuck according to claim 1, further comprising a locking member (4), the locking member (4) being sleeved on the outer periphery of the clamping jaw (2), the locking member (4) being provided with an internal thread, the clamping jaw (2) being in threaded engagement with the locking member (4) such that the clamping jaw (2) is movably arranged in the drill body (1);

the drill body (1), the locking piece (4) and the clamping jaw (2) are all arranged in the shell (5).

7. Drill chuck according to claim 6, characterized by further comprising a support (6), the support (6) being provided in the housing (5) and the support (6) being adapted to support the locking member (4);

and a bearing (7), wherein the bearing (7) is arranged in a containing space formed by the locking piece (4) and the supporting piece (6).

8. Drill chuck according to claim 1, characterized in that the radial cross section of the jaws (2) at the margin (21) is of a fan-shaped structure.

9. Drill chuck according to claim 6, characterized in that the housing (5) comprises a front sleeve (51) and a rear sleeve (52), the front sleeve (51) being arranged at an end close to the working tool (3), the rear sleeve (52) being arranged at an end remote from the working tool (3), the front sleeve (51) and the rear sleeve (52) together forming a space for accommodating the drill body (1), the locking member (4) and the clamping jaw (2).

10. Drill chuck according to claim 9, characterized in that the locking member (4) cooperates with the front sleeve (51), the front sleeve (51) being rotated to rotate the locking member (4), the locking member (4) moving the clamping jaw (2).