WO2014022987A1

WO2014022987A1 - Drill chuck

Info

Publication number: WO2014022987A1
Application number: PCT/CN2012/079824
Authority: WO
Inventors: 柳尧亭; 徐桂洪
Original assignee: 威海达旺五金制品有限责任公司
Priority date: 2012-08-08
Filing date: 2012-08-08
Publication date: 2014-02-13
Also published as: WO2014022987A8

Abstract

Disclosed is a drill chuck, provided with a front body (1), a rear body (2), a clamping jaw (3), a nut (5), and a rear socket (10), wherein the clamping jaw is provided with an external clamping jaw thread (18), and the nut is provided with an internal nut thread (19), with the external clamping jaw thread mutually cooperating with the internal nut thread; the nut is fixedly connected to the rear socket, and the rear socket is fixedly connected to the rear body; and the helix angle α between the external clamping jaw thread and the internal nut thread is in the range of 1.43°≤α≤19.12°. The drill chuck has a large clamping force, and is not only able to be opened conveniently but is also able to protect the tool, and has a simple structure and relatively low costs.

Description

New drill chuck

Technical field

The invention relates to a clamp for a machining tool, in particular to a clamping force and a convenient opening and protection tool, a simple structure, a large volume and a small volume, and a low cost, and can widely replace the existing wrench and hand tightness. New drill chucks with self-tightening chucks.

Background technique

Drilling and milling are often used in production and processing activities, such as machine tools and electric drills. Drill chucks for holding drills, milling cutters, etc. on the working axes of these equipments have experienced long-term application and improvement. However, there are still many shortcomings.

Nowadays, the most commonly used on the market is the wrench drill chuck. The drill chuck is used to increase the clamping force of the drill chuck by special auxiliary tools. When the drill bit is replaced, the special auxiliary tool is also needed to release the drill chuck. Head, which can be used on some large, medium and small processing equipment. The advantage of this type of wrench drill chuck is that it has a wide range of applications. The disadvantage is that special auxiliary tools must be used. Once lost or damaged, the drill chuck cannot be used, and the drill is added by a special auxiliary tool such as a wrench. The clamping force of the chuck is limited by the strength of the human body, which sometimes causes the clamping force to fail to meet the requirements of some equipments, and the phenomenon of slipping and slipping during work does not affect the quality and precision of the workpiece.

The current wrench drill chuck has many variations, and it is changed to a self-tightening chuck to increase its clamping force. For example, the patent application with the authorization number CN2455421Y provides a self-tightening of the wrench drill chuck. Although the chuck chuck can be self-tight, the clamping force is difficult to control and is too large, and on the one hand, the cutter is easily damaged, and on the other hand, the disassembly is difficult. The above problem has been improved in the patent application with the publication number CN1390668A, but the structure is complicated and the cost is high.

Summary of the invention

The invention is directed to the technical problem that the existing wrench drill chuck has insufficient clamping force, and the clamping force is too large after the self-tightening the drill chuck, so that it cannot be opened and the tool is broken and the structure is complicated, and the utility model can provide a work time. Large enough clamping force, no need to use special tools to open, easy to operate, easy to operate and protect the tool, simple structure of the new drill chuck.

To this end, the present invention is provided with a front body, a rear body, a clamping jaw, a nut and a rear sleeve. The clamping jaw is provided with an external thread of the clamping jaw, and the nut is provided with a nut internal thread, and the external thread of the clamping jaw cooperates with the internal thread of the nut. The nut is fixedly connected with the rear sleeve, and the rear sleeve is fixedly connected with the rear body, and the spiral angle of the external thread of the jaw and the internal thread of the nut is: 1.43°≤α≤19.12°.

A preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is: 2.08 ° ≤ α ≤ 18.01 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is 3.28 ° ≤ α ≤ 16.84 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is 4.16 ° ≤ α ≤ 15.59 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is: 5.32 ° ≤ α ≤ 14.27 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is: 6.19 ° ≤ α ≤ 13.01 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is: 7.63 ° ≤ α ≤ 12.86 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is 8.05 ° ≤ α ≤ 11.41 °.

A further preferred technical solution of the present invention is that the helical lifting angle of the external thread of the jaw and the internal thread of the nut is: 9.76 ° ≤ α ≤ 10.54 °.

According to the invention, the nut and the nut sleeve are fixedly connected by the clamping jaw and the nut, the nut sleeve is fixedly connected with the rear sleeve, the rear sleeve is fixedly connected with the rear body, and the rotation of the rear body drives the rear sleeve, the nut sleeve and the nut to rotate, thereby The driving jaw moves up and down along the jaw hole to realize self-tightening, and the clamping force is controlled by the machine, thereby overcoming the problem that the clamping force of the original wrench chuck is insufficient.

In the technical solution of the present invention, the value of the helix angle α of the external thread of the jaw and the internal thread of the nut is a key point for realizing the technical effect of the present invention on the premise that the rest of the structure is determined. If the value of α is too small, the jaw and the nut will be in an over-tight state, which is easy to be stuck and requires a special tool to open; if the value of α is too large, the jaw and nut will be too loose, and the connection will not be Reliable, causing the equipment to fall off the equipment automatically due to the inability to clamp the drill bit during operation, so that the equipment cannot work normally. The invention selects the value of the helix angle of the external thread of the jaw and the internal thread of the nut reasonably, so that the jaw and the nut are in an ideal connection state required by the device, and there is no jamming and cannot be opened or connected. Reliable and not close to the tool. The invention can control the clamping force of the clamping jaw by adjusting the screwing angle of the internal thread of the nut and the external thread of the clamping jaw, and does not require other auxiliary devices, and the clamping force is too large or too small compared to other solutions. In terms of the method, the structure is simple and the cost is low.

DRAWINGS

Figure 1 is a general assembly view of the present invention;

Figure 2 is a schematic view showing the structure of the precursor of the present invention;

Figure 3 is a half cross-sectional view of the rear body of the present invention;

Figure 4 is a schematic view showing the structure of the jaw of the present invention;

Figure 5 is a cross-sectional view of the nut of the present invention;

Figure 6 is a cross-sectional view of the nut sleeve of the present invention;

Figure 7 is a plan view of the bearing of the present invention;

Figure 8 is a plan view of the bearing pad of the present invention;

Figure 9 is a schematic structural view of a front cover of the present invention;

Figure 10 is a schematic structural view of a back cover of the present invention;

Figure 11 is a plan view of the circlip of the present invention.

The symbols in the figure indicate:

1. precursor; 2. rear body; 3. jaw; 4. jaw hole; 5. nut; 6. nut sleeve; 7. bearing; 8. bearing pad; 9. front sleeve; 10. rear sleeve; Groove; 12. precursor hemispherical groove; 13. rear body hemispherical groove; 14. steel ball; 15. precursor spring groove; 16. rear body spring groove; 17. circlip; ; 19. nut internal thread; 20. bearing steel ball; 21. main body connection hole; 22. tool hole.

detailed description

As shown in Figures 1, 2 and 3, the invention mainly comprises a front body 1, a rear body 2, a jaw 3, a jaw hole 4, a nut 5, a nut sleeve 6, a front sleeve 9 and a rear sleeve 10. The rear body 2 is partially built into the front body 1, and the clamping jaw 3 is located in the jaw hole 4 of the front body 1. The clamping jaw 3 is provided with a thread which cooperates with the thread of the nut 5, and the nut 5 is fixed to the nut sleeve 6. The nut sleeve 6 is fixedly connected with the rear sleeve 10, and the rear sleeve 10 is fixedly connected with the rear body 2. The rotation of the rear body 2 drives the rear sleeve 10 to rotate, and then the nut sleeve 6 and the nut 5 are rotated, and the rotation of the nut 5 is passed through. The mutually cooperating jaws 3 move downward in the jaw holes 4, thereby clamping the cutters and completing the machining process.

Fig. 2-A is a cross-sectional view of the precursor 1 of the present invention, and Fig. 2-B is a plan view of the precursor 1 of the present invention. The inner end of the rear end of the front body 1 is provided with a groove 11, and when the rear body 2 is inserted into the front body 1, the rear body 2 just coincides with the groove 11. At the rear end of the precursor 1, a front hemispherical groove 12 is provided along the central axis, which corresponds to the rear body hemispherical groove 13 on the rear body 2, forming a completed ball groove. A steel ball 14 is disposed in the ball groove. When the rear body 2 rotates relative to the front body 1, the steel ball 14 rolls in place, and the friction between the rear body 2 and the front body 1 changes from the original sliding friction. Rolling friction greatly reduces the friction between the front body 1 and the rear body 2, making the entire drill chuck more flexible.

The front body 1 is provided with a front spring retaining groove 15 , and the rear body 2 is provided with a rear body spring groove 16 at a position corresponding to the front spring retaining groove 15 , and the two cooperate with each other to form a complete spring groove. A snap spring 17 is arranged in the spring groove. The circlip 17 is pinched into the rear body spring groove 16, and the current body 1 and the rear body 2 are engaged with each other, that is, when the front body spring groove 15 and the rear body spring groove 16 correspond to each other to form a complete circlip groove, the card The spring 17 is stretched and partially enters the front spring retaining groove 15, so that it acts as a limit, so that the rear body 2 can only rotate laterally relative to the front body 1 and cannot move radially relative to the front body 1. To ensure the stability of the structure.

The front body 1 is machined obliquely symmetrically with three jaw holes 4 extending through the upper and lower sides, and the jaws 3 are located in the jaw holes 4. As shown in FIG. 4, FIG. 4-A is a front view of the jaw 3, and FIG. 4-B is a plan view of the jaw 3, and the jaw 3 is provided with a jaw external thread 18. The entire drill chuck is also provided with a nut 5 which is tightly fitted over the front body 1. As shown in FIG. 5, the nut 5 is provided with a nut internal thread 19 which cooperates with the external thread 18 of the jaw on the jaw 3. When the nut 5 rotates, the jaw 3 will move up and down with the jaw hole 4 therein. motion. A bearing 7 and a bearing pad 8 are further disposed between the upper end of the nut 5 and the front body 1. As shown in Figs. 7 and 8, the bearing 7 is disposed at the upper end of the nut 5, and the upper end of the bearing pad 8 is in close contact with the front body 1, The lower end is directly attached to the bearing 7. Since the bearing 7 is provided with the bearing steel ball 20, when the nut 5 rotates, the friction between the nut and the front body 1 becomes rolling friction, which reduces the resistance between the two and increases the flexibility of the entire drill chuck. Sex.

The helix angle α between the external thread 18 of the jaw and the internal thread 19 of the nut is 10.54°.

The front end of the front body 1 is further provided with a cutter hole 22 larger than the diameter of the applicable tool. After the cutter is placed therein, the cutter is clamped or released by the up and down movement of the jaw 3.

A nut sleeve 6 is sleeved on the outer circumference of the nut 5. As shown in FIG. 6, the nut sleeve 6 and the nut 5 are connected by an interference fit, and other fixed link manners can also be adopted, and only the rotation of the nut sleeve 6 can be driven. The nut 5 can be rotated. Similarly, the front sleeve 9 and the rear sleeve 10 are fixedly coupled to the outer periphery of the nut sleeve 6, as shown in FIGS. 9 and 10, FIG. 10-A is a half cross-sectional view of the rear sleeve 10, and FIG. 10-B is a top view of the rear sleeve 10. The rear end of the rear sleeve 10 and the front end of the front sleeve 9 cooperate with each other, and they are fixedly connected with the nut sleeve 6 by an interference fit or other connection manner to ensure the stability of the entire drill chuck structure. As the back cover 10 rotates, the nut sleeve 6 that is fixedly coupled thereto will also rotate with it.

A cylindrical ring is bent inwardly along the central axis at the rear end of the rear sleeve 10, and is sleeved on the rear body 2, and is fixedly coupled to the rear body 2 by an interference fit or other means. The rear body 2 is provided with a main body connecting hole 21, which is connected with the working shaft of the main body. When the main working shaft rotates, the rear body 2 also rotates together, so that the rear sleeve 10 also rotates together, and the front sleeve 9 and the front sleeve 9 The precursor 1 is fixedly connected by an interference fit or other means.

The following describes the working process of the present invention:

Insert the cutter into the cutter hole 22 of the precursor 1, hold the back sleeve 10 with one hand, and hold the front sleeve 9 or the front body 1 with the other hand, because the front sleeve 9 is fixedly connected with respect to the front body 1, the rear body 2 is a fixed connection with respect to the rear sleeve 10, the rear sleeve 10 is fixedly connected with respect to the nut sleeve 6, the nut sleeve 6 is fixedly connected with respect to the nut 5, the nut internal thread 19 of the nut 5 and the external thread 18 of the jaw 3 of the jaw 3 Cooperating with each other, while the back sleeve 10 is held by hand without rotation, so the rotation of the front body 1 or the front sleeve 9 forces the three jaws 3 in the front body 1 to move downward along the jaw hole 4, three The gap between the lower ends of the jaws 3 is also reduced until the tool placed in the tool hole 22 is tightened.

The main body connecting hole 21 of the rear body 2 is connected with the working shaft of the main machine. At this time, the device motor is started, and the rear body 2 is rotated at a high speed by the main working shaft, because the rear sleeve 10, the nut sleeve 6, the nut 5 and the clamping jaw 3 The interaction between the static inertia has a strong impact force in the initial stage of the rotation of the rear body 2, forcing the nut 5 and the jaw 3 to rotate with it. This impact force further causes the three jaws 3 to clamp the tool, after which the tool The reaction force with the workpiece also forces relative rotation between the jaw 3, the nut 5, the nut sleeve 6 and the back sleeve 10, which also increases the clamping force of the three jaws 3 on the cutter, thus providing The self-tightening function makes the whole drill chuck have high precision and stability. As the motor rotates, the three 3 clamping tools gradually rotate together to complete the machining process.

In the present invention, the front body 1 and the rear body 2 are restrained by a snap spring, which can be modified in various ways. For example, the spring groove formed by the cooperation of the front body 1 and the rear body 2 is changed into a cylindrical pin hole, and a cylindrical pin is arranged in the cylindrical pin hole, which can also serve as a limit position. Of course, the cylindrical pin can also be set to any Other shapes can only be used as a limit. For example, the spring groove or the cylindrical pin hole can be omitted, and the steel ball originally disposed at the lateral contact position of the front and rear body can be directly moved to the position where the radial connection is connected, so that the limit position is ensured, and two The friction between the two is rolling friction, which maintains the flexibility of the drill chuck operation, and a plurality of rolling bearings can be arranged between the front and rear bodies. All manner of limitation between the front and rear bodies that can be conceived by a person of ordinary skill is within the scope of the present invention.

The power of the present invention is transmitted to the rear sleeve 10 through the rear body 2, and then the rear sleeve 10 is transmitted to the jaws 3 through a series of devices to drive the jaws 3 to move up and down in the jaw holes 4, which can also be used. The deformation, such as omitting the nut sleeve 6, directly connects the nut 5 and the rear sleeve 10 to each other. Regardless of the type of transfer, it is only necessary to ensure that the rotation of the back cover 10 can finally move the jaws 3 up and down within the jaw holes 4.

In the present invention, an annular oil pool may be provided at the front end of the precursor, which may be continuous or may be disposed corresponding to the three jaws 3, and may be in a discontinuous state. Grease is sealed in the annular oil pool, so that the grease can be cut into the jaws 3 during the up and down movement, so that the friction between the jaws 3 and the front body 1 is greatly reduced, and the jaws are extended. 3 flexible time, which in turn extends the life of the drill chuck. The outside of the annular oil pool is tightly fitted to the front sleeve 9 and the grease does not penetrate outward.

In order to make the positioning of the jaws 3 more accurate, it is also possible to provide a jaw positioning device between the jaws 3 and the front body 1 or other parts for enabling the jaws 3 to move up and down only along the jaw holes 4 without lateral Turn. In addition, the steel ball 14 and the bearing steel ball 20 used in the present invention are all made of a wear-resistant steel material, and other materials capable of performing the same function may be used instead.

Example 2:

The helix angle α between the external thread of the jaw and the internal thread of the nut is 1.43°.

Example 3:

The helix angle α between the external thread of the jaw and the internal thread of the nut is 2.08°.

Example 4:

The helix angle α between the external thread of the jaw and the internal thread of the nut is 3.28°.

Example 5:

The helix angle α between the external thread of the jaw and the internal thread of the nut is 4.16°.

Example 6

The helix angle α between the external thread of the jaw and the internal thread of the nut is 5.32°.

Example 7

The helix angle α between the external thread of the jaw and the internal thread of the nut is 6.19°.

Example 8

The helix angle α between the external thread of the jaw and the internal thread of the nut is 7.63°.

Example 9

The helix angle α between the external thread of the jaw and the internal thread of the nut is 8.05°.

Example 10:

The helix angle α between the external thread of the jaw and the internal thread of the nut is 9.76°.

Example 11

The helix angle α between the external thread of the jaw and the internal thread of the nut is 11.41°.

Example 12

The helix angle α between the external thread of the jaw and the internal thread of the nut is 12.23°.

Example 13

The helix angle α between the external thread of the jaw and the internal thread of the nut is 13.01°.

Example 14

The helix angle α between the external thread of the jaw and the internal thread of the nut is 14.27°.

Example 15;

The helix angle α between the external thread of the jaw and the internal thread of the nut is 15.59°.

Example 16:

The helix angle α between the external thread of the jaw and the internal thread of the nut is 16.84°.

Example 17

The helix angle α between the external thread of the jaw and the internal thread of the nut is 18.01°.

Example 18

The helix angle α between the external thread of the jaw and the internal thread of the nut is 19.12°.

The rest of the structures of Embodiment 2 to Embodiment 18 are the same as those of Embodiment 1.

Table 1 is the average value of the helix angle when the pitch is 2 mm to 12 mm and the number of thread heads is 1, 2, and 3, respectively. It should be noted that the pitch referred to in this table, regardless of which of the 1, 2, and 3 threads, is the distance between two adjacent threads, and the spiral angle is a single head. The helix angle of the thread.

Table 1:

螺距（mm） Pitch (mm)	2.00 2.00	3.00 3.00	4.00 4.00	5.00 5.00	6.00 6.00	7.00 7.00	8.00 8.00	9.00 9.00	10.00 10.00	11.00 11.00	12.00 12.00
头数 Head count	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00	1.00 1.00
导程（mm） Lead (mm)	2.00 2.00	3.00 3.00	4.00 4.00	5.00 5.00	6.00 6.00	7.00 7.00	8.00 8.00	9.00 9.00	10.00 10.00	11.00 11.00	12.00 12.00
小端中径（mm） Small end diameter (mm)	23.35 23.35	24.10 24.10	24.85 24.85	25.60 25.60	26.35 26.35	27.10 27.10	27.85 27.85	28.60 28.60	29.35 29.35	30.10 30.10	30.85 30.85
大端中径（mm） Large end diameter (mm)	28.07 28.07	28.82 28.82	29.57 29.57	30.32 30.32	31.07 31.07	31.82 31.82	32.57 32.57	33.32 33.32	34.07 34.07	34.82 34.82	35.57 35.57
平均中径（mm） Average diameter (mm)	25.71 25.71	26.46 26.46	27.21 27.21	27.96 27.96	28.71 28.71	29.46 29.46	30.21 30.21	30.96 30.96	31.71 31.71	32.46 32.46	33.21 33.21
小端螺旋升角 Small end spiral angle	1.56 1.56	2.27 2.27	2.93 2.93	3.56 3.56	4.15 4.15	4.70 4.70	5.22 5.22	5.72 5.72	6.19 6.19	6.64 6.64	7.06 7.06
大端螺旋升角 Big end spiral angle	1.30 1.30	1.90 1.90	2.47 2.47	3.00 3.00	3.52 3.52	4.01 4.01	4.47 4.47	4.91 4.91	5.34 5.34	5.74 5.74	6.13 6.13
平均螺旋升角 Average helix angle	1.43 1.43	2.08 2.08	2.70 2.70	3.28 3.28	3.83 3.83	4.35 4.35	4.85 4.85	5.32 5.32	5.76 5.76	6.19 6.19	6.59 6.59

螺距（mm） Pitch (mm)	2.00 2.00	3.00 3.00	4.00 4.00	5.00 5.00	6.00 6.00	7.00 7.00	8.00 8.00	9.00 9.00	10.00 10.00	11.00 11.00	12.00 12.00
头数 Head count	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00	2.00 2.00
导程（mm） Lead (mm)	4.00 4.00	6.00 6.00	8.00 8.00	10.00 10.00	12.00 12.00	14.00 14.00	16.00 16.00	18.00 18.00	20.00 20.00	22.00 22.00	24.00 24.00
小端中径（mm） Small end diameter (mm)	23.35 23.35	24.10 24.10	24.85 24.85	25.60 25.60	26.35 26.35	27.10 27.10	27.85 27.85	28.60 28.60	29.35 29.35	30.10 30.10	30.85 30.85
大端中径（mm） Large end diameter (mm)	28.07 28.07	28.82 28.82	29.57 29.57	30.32 30.32	31.07 31.07	31.82 31.82	32.57 32.57	33.32 33.32	34.07 34.07	34.82 34.82	35.57 35.57
平均中径（mm） Average diameter (mm)	25.71 25.71	26.46 26.46	27.21 27.21	27.96 27.96	28.71 28.71	29.46 29.46	30.21 30.21	30.96 30.96	31.71 31.71	32.46 32.46	33.21 33.21
小端螺旋升角 Small end spiral angle	3.12 3.12	4.53 4.53	5.85 5.85	7.09 7.09	8.25 8.25	9.34 9.34	10.36 10.36	11.33 11.33	12.24 12.24	13.10 13.10	13.91 13.91
大端螺旋升角 Big end spiral angle	2.60 2.60	3.79 3.79	4.92 4.92	5.99 5.99	7.01 7.01	7.97 7.97	8.89 8.89	9.76 9.76	10.58 10.58	11.37 11.37	12.12 12.12
平均螺旋升角 Average helix angle	2.86 2.86	4.16 4.16	5.39 5.39	6.54 6.54	7.63 7.63	8.66 8.66	9.63 9.63	10.54 10.54	11.41 11.41	12.23 12.23	13.01 13.01

螺距（mm） Pitch (mm)	2.00 2.00	3.00 3.00	4.00 4.00	5.00 5.00	6.00 6.00	7.00 7.00	8.00 8.00	9.00 9.00	10.00 10.00	11.00 11.00	12.00 12.00
头数 Head count	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00	3.00 3.00
导程（mm） Lead (mm)	6.00 6.00	9.00 9.00	12.00 12.00	15.00 15.00	18.00 18.00	21.00 21.00	24.00 24.00	27.00 27.00	30.00 30.00	33.00 33.00	36.00 36.00
小端中径（mm） Small end diameter (mm)	23.35 23.35	24.10 24.10	24.85 24.85	25.60 25.60	26.35 26.35	27.10 27.10	27.85 27.85	28.60 28.60	29.35 29.35	30.10 30.10	30.85 30.85
大端中径（mm） Large end diameter (mm)	28.07 28.07	28.82 28.82	29.57 29.57	30.32 30.32	31.07 31.07	31.82 31.82	32.57 32.57	33.32 33.32	34.07 34.07	34.82 34.82	35.57 35.57
平均中径（mm） Average diameter (mm)	25.71 25.71	26.46 26.46	27.21 27.21	27.96 27.96	28.71 28.71	29.46 29.46	30.21 30.21	30.96 30.96	31.71 31.71	32.46 32.46	33.21 33.21
小端螺旋升角 Small end spiral angle	4.68 4.68	6.78 6.78	8.74 8.74	10.56 10.56	12.27 12.27	13.86 13.86	15.34 15.34	16.73 16.73	18.02 18.02	19.24 19.24	20.38 20.38
大端螺旋升角 Big end spiral angle	3.89 3.89	5.68 5.68	7.36 7.36	8.95 8.95	10.45 10.45	11.86 11.86	13.20 13.20	14.46 14.46	15.66 15.66	16.79 16.79	17.86 17.86
平均螺旋升角 Average helix angle	4.28 4.28	6.23 6.23	8.05 8.05	9.76 9.76	11.36 11.36	12.86 12.86	14.27 14.27	15.59 15.59	16.84 16.84	18.01 18.01	19.12 19.12

Claims

The utility model relates to a novel drill chuck, which is provided with a front body, a rear body, a clamping jaw, a nut and a rear sleeve. The clamping jaw is provided with external claws of the clamping jaw, and the nut is provided with a nut internal thread, the external thread of the clamping jaw and the internal thread of the nut Cooperating with each other, the nut is fixedly connected with the rear sleeve, and the rear sleeve is fixedly connected with the rear body, wherein the outer angle of the external thread of the jaw and the internal thread of the nut is in a range of 1.43°≤α≤19.12°.
The novel drill chuck according to claim 1, wherein the outer angle of the external thread of the jaw and the internal thread of the nut has a spiral angle of the range of 2.08° ≤ α ≤ 18.01°.
The novel drill chuck according to claim 2, wherein the outer angle of the external thread of the jaw and the internal thread of the nut is in the range of 3.28 ° ≤ α ≤ 16.84 °.
The novel drill chuck according to claim 3, wherein the outer angle of the external thread of the jaw and the internal thread of the nut is in the range of 4.16 ° ≤ α ≤ 15.59 °.
The novel drill chuck according to claim 4, wherein the outer angle of the external thread of the jaw and the internal thread of the nut are in the range of 5.32 ° ≤ α ≤ 14.27 °.
The novel drill chuck according to claim 5, wherein the outer angle of the external thread of the jaw and the internal thread of the nut has a range of helix angle: 6.19 ° ≤ α ≤ 13.01 °.
The novel drill chuck according to claim 6, wherein the outer angle of the external thread of the jaw and the internal thread of the nut is in the range of 7.63 ° ≤ α ≤ 12.86 °.
The novel drill chuck according to claim 7, wherein the outer angle of the external thread of the jaw and the internal thread of the nut are in a range of 8.05 ° ≤ α ≤ 11.41 °.
The novel drill chuck according to claim 8, wherein the outer angle of the external thread of the jaw and the internal thread of the nut are in the range of 9.76 ° ≤ α ≤ 10.54 °.