Hand-tight drill chuck with locking function

Abstract

The hand-tight drill chuck with the locking function comprises a locking piece and an inner gear ring, the locking piece is provided with an elastic piece, the elastic piece is provided with a locking end warped outwards, the inner gear ring comprises a first ring-shaped base body, the first ring-shaped base body is provided with an inner gear piece which can elastically deform towards the outer side in the radial direction to be matched with a rotary sleeve in an extrusion mode, and the first ring-shaped base body is provided with a second ring-shaped base body. The outer side face of the inner tooth piece is provided with wave-shaped arc-shaped protrusions in the circumferential direction, the inner tooth piece is provided with inner ratchets facing the radial inner side, the inner ratchets are matched with the lock end, the rotating sleeve is provided with a structure for controlling the lock end, and an extrusion structure is arranged between the nut and the step. The extrusion structure extrudes the inner gear ring backwards and towards the radial outer side based on reverse thrust borne by the nut, the inner tooth pieces are pushed and extruded to be elastically deformed and opened towards the radial outer side, and therefore the wave-shaped arc-shaped protrusions and the inner wall of the rotating sleeve are tightly extruded. The anti-inertia self-loosening unlocking performance of the hand-tight drill chuck with the locking function is improved, and abrasion of the rotating sleeve can be reduced while the anti-inertia self-loosening performance is high.

Description

Technical Field

[0001] The utility model relates to a drill chuck, in particular to a hand-tight drill chuck with a locking function. Background Art

[0002] A hand-tight drill chuck is provided with a drill body, a clamping jaw, a nut, and a rotating sleeve. The nut is threadedly connected to the clamping jaw, and the rotating sleeve is directly or connected to the nut through a connecting structure. By manually operating the rotating sleeve, the nut is rotated to drive the clamping jaw to move forward or backward, so that the clamping jaw clamps or loosens the drill bit. There is also a hand-tight drill chuck provided with a locking structure. The locking structure generally includes a toothed ring fixed on the surface of the drill body and an elastic piece connected to the nut. The elastic piece is located radially outside the toothed ring and enters the locked state under the control of the rotating sleeve.

[0003] With the development of lithium battery technology, the rotational speed of electric drills is getting faster and faster. When drilling holes, when the electric drill stops from a high rotational speed, inertia will be generated instantaneously. The drill chuck will loosen itself due to the sudden stop of the electric drill, which is manifested as the unlocking of the rotating sleeve under the action of inertia, resulting in the nut rotating in the direction of opening the clamping jaw of the drill chuck due to inertia, causing the drill bit to loosen. And even if a locking structure is provided, under the current lithium battery technology, the locked state of the drill chuck may fail. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hand-tight drill chuck with enhanced locking force during operation, thereby improving the anti-inertia self-loosening and unlocking performance of the hand-tight drill chuck with a locking function, and being able to reduce the wear of the rotating sleeve while having high anti-inertia self-loosening performance. For this purpose, the utility model adopts the following technical solutions:

[0005] A hand-tight drill chuck with a locking function is provided with a drill body, a clamping jaw, a nut, and a rotating sleeve. The nut is threadedly connected to the clamping jaw, and the rotating sleeve is connected to the nut through a connecting structure to drive the nut to rotate. The nut is sleeved outside the drill body and supported on a step in the middle of the drill body. The hand-tight drill chuck is provided with a locking structure; characterized in that,

[0006] The locking mechanism comprises a locking piece and a positioned inner gear ring, the locking piece being connected to the nut and rotating synchronously with the nut around the central axis of the drill body, the locking piece is provided with a spring plate, the spring plate having a locking end tilted outward, the inner gear ring comprising a first ring-shaped base, the first ring-shaped base being sleeved on the drill body, the first ring-shaped base being provided with an inner gear piece which can be elastically deformed radially outward and squeezed into engagement with the rotating sleeve, the outer side surface of the inner gear piece being circumferentially provided with a wavy arc protrusion, the inner gear piece being provided with an inner ratchet facing radially inward, the inner ratchet cooperating with the locking end, the rotating sleeve being provided with a structure for controlling the locking end, the hand-tight drill chuck being provided with an extrusion structure between the nut and the step, the extrusion structure being pressed backward and radially outward based on the reverse thrust received by the nut during the rotation operation of the drill chuck, pushing the inner gear piece to elastically deform and open radially outward, so that the wavy arc protrusion is squeezed tightly against the inner wall of the rotating sleeve.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] The top angle of the locking end is less than or equal to 90°, the bottom angle of the inner ratchet is less than or equal to 90°, and the bottom angle of the inner ratchet is greater than or equal to the top angle of the locking end.

[0009] The top angle of the locking end is 60-75°.

[0010] The tooth groove depth t on the inner gear ring is ≥ 40% of the total thickness T of the inner gear ring. The total thickness refers to the radius difference between the circumscribed circle and the inscribed circle of the inner gear ring. The tooth groove depth refers to the difference between the distance from the bottom of the inner ratchet tooth to the center of the inner gear ring and the radius of the inscribed circle of the inner gear ring.

[0011] The depth t≥0.5mm.

[0012] The inner gear ring is an integral inner gear ring formed by cold extrusion.

[0013] The nut is an integral nut, the drill chuck is provided with a clamping ring, the clamping ring is provided at the front end of the nut, the clamping ring includes an integral continuous pressure ring body and a plurality of elastic cards located around the inner hole of the pressure ring body, and an annular groove cooperating with the elastic cards is provided on the drill body.

[0014] The inner gear pieces are in an arc shape. A circle of inner gear pieces is provided on the first ring-shaped base of the inner gear ring, and a plurality of vertical gaps are provided in the circle of inner gear pieces.

[0015] The first ring-shaped base of the inner gear ring is placed on the step, and the first ring-shaped base of the inner gear ring has a radially outer hollow portion, and the inner tooth piece is bent and arranged at the outer edge of the hollow portion.

[0016] There is an annular bearing steel ball cavity between the internal gear ring and the nut. Bearing steel balls are arranged in the bearing steel ball cavity. The bearing steel ball cavity has working surfaces facing backward and radially outward. When working, it extrudes the bearing steel balls radially outward and causes the internal tooth pieces to elastically deform radially outward.

[0017] The locking part includes a second annular base body. The second annular base body of the locking part is located between the first annular base body of the internal gear ring and the rear end of the nut. The second annular base body of the locking part and the internal gear ring enclose the annular bearing steel ball cavity. The second annular base body of the locking part is provided with the working surfaces facing backward and radially outward.

[0018] The internal gear ring forms a circumferential anti-relative rotation fit with the drill body through the radially inward protrusion of the inner hole wall of its first annular base body.

[0019] A plurality of arc grooves are formed on the drill body by axially punching holes at its edge. The first annular base body of the internal gear ring is a sheet-like ring body, and arc protrusions matching the arc grooves are formed around its inner hole.

[0020] The locking part includes a second annular base body. Multiple groups of locking structures are arranged on the second annular base body of the locking part. Each group of locking structures includes the elastic piece and an outward control protrusion connected to the elastic piece. The end of the elastic piece is the outwardly warped locking end. The inner wall of the rotating sleeve is provided with a cam surface for controlling cooperation with the outward control protrusion. The locking part is also provided with an outward connection protrusion integrated with the locking part. The rotating sleeve is provided with a connection groove for cooperating with the outward connection protrusion.

[0021] The internal gear ring is subjected to heat treatment hardening after forming.

[0022] Due to the adoption of the technical solution of the present invention, under the combined action of the centrifugal force generated by high-speed rotation and the reaction force received by the drill chuck during the drilling process, the present invention can extrude the internal gear ring backward and outward, causing the internal tooth pieces on the internal gear ring to open outward. Through the wave-shaped arc protrusions being tightly pressed against the inner wall of the rotating sleeve, the locking effect and performance of the locking structure are ensured, ensuring that the drill chuck will not fail to lock. At the same time, it not only has a better anti-loosening effect, but also avoids the cutting loss of the inner wall of the rotating sleeve, ensuring the service life. Further, the axial limit of the overall nut is also prevented from loosening by the snap ring of the present invention, further ensuring the locking effect and performance of the locking structure and ensuring that the drill chuck will not fail to lock. Description of the Drawings

[0023] Figure 1 It is an exploded view of the structure of an embodiment of the present invention.

[0024] Figure 2 It is a cross-sectional view of an embodiment of the present invention before entering the locked state.

[0025] Figure 3 and Figure 4 are respectively the top view and the perspective view of the internal gear ring in the embodiment of the present utility model.

[0026] Figure 5 is an enlarged view of part I in 3.

[0027] Figure 6 is a combined schematic view of the internal gear ring and the lock ring in the embodiment of the present utility model.

[0028] Figure 7 is the top view of the internal gear ring and the lock ring in the embodiment of the present utility model.

[0029] Figure 8 is a cross-sectional view of the embodiment of the present utility model in the locked state.

[0030] Figure 9 is Figure 8 the C-C cross-sectional view of.

[0031] Figure 10 is a schematic view of the drill body in the embodiment of the present utility model.

[0032] Figure 11 is a schematic view of another embodiment of the internal gear ring in the embodiment of the present utility model.

[0033] Figure 12 is a cross-sectional view of the embodiment of the present utility model after adding damping oil.

[0034] Figure 13 is Figure 12 the D-D cross-sectional view of. Specific Embodiment

[0035] Referring to the attached Figures 1-8 . A hand-tight drill chuck with a locking function provided by the present utility model is provided with a drill body 1, a jaw 2, a nut 3, a rotating sleeve, and a snap ring 8. The nut 3 is threadedly connected to the jaw 2. The rotating sleeve includes an outer sleeve 41 and a bushing 42 fixed to the outer sleeve 41 and adapted to be configured. The bushing 42 in the rotating sleeve is connected to the nut 3 through a connecting structure and can drive the nut 3 to rotate. The nut 3 is sleeved outside the drill body 1 and supported on a step 11 in the middle of the drill body.

[0036] The locking drill chuck is provided with a locking structure, which includes a locking member 5 and a positioned inner gear ring 6. The locking member 5 is connected to the nut 3 and rotates synchronously with the nut 3 around the central axis of the drill body 1. The locking member 5 is provided with a spring piece 51, and the spring piece 51 has a locking end 52 that is tilted outward. The inner gear ring 6 includes a first ring-shaped base 60. The first ring-shaped base 60 is provided with an inner tooth piece 61 that can elastically deform radially outward and be squeezed into fit with the rotating sleeve. The outer side surface of the inner tooth piece 61 is provided with a wavy arc-shaped protrusion 64 along the circumferential direction. The inner tooth piece 61 is provided with an inner ratchet 611 facing radially inward, and the inner ratchet 611 is aligned with the locking end 52. In cooperation, the bushing 42 in the rotating sleeve is provided with a structure for controlling the locking end 52 so that the locking end 52 leaves the inner ratchet 611 or is inserted into the inner ratchet 611. The drill chuck is provided with an extrusion structure between the nut 3 and the step 11. The reverse thrust received by the drill chuck during operation causes the nut 3 to move backward. The reverse thrust received by the nut 3 is transmitted to the extrusion structure. The extrusion structure extrudes the inner gear ring 6 backward and radially outward, causing the inner gear ring 6 to bend backward and radially outward (obliquely to the rear and outside), pushing and squeezing the inner tooth piece 61 to elastically deform and open radially outward, and the wavy arc protrusion 64 is tightly squeezed against the inner wall of the rotating sleeve (the inner wall of the bushing 42 in this embodiment) ( Figure 8 Because the two are in a squeezed state, Figure 2 When the nut 3 and the rotary sleeve 42 are not in operation, the inner tooth piece 61 rebounds and the two are disengaged, thereby being constrained, thereby enhancing the overall locking force of the drill chuck and preventing the nut 3 and the rotary sleeve 42 from loosening by themselves.

[0037] To improve the performance of the locking end padlock during self-locking, the top angle A of the locking end 52 is less than or equal to 90°, the bottom angle B of the inner ratchet tooth 611 is less than or equal to 90°, and the bottom angle of the inner ratchet tooth 611 is greater than or equal to the top angle of the locking end 52. Preferably, the top angle A of the locking end 52 is 60-75°, and the bottom angle B of the inner ratchet tooth 611 is 75-85°.

[0038] To improve the internal gear ring's deformation resistance and ease manufacturing, the tooth groove depth t on the internal gear ring should be ≥ 40% of the total thickness T of the internal gear ring. The total thickness refers to the difference in radius between the circumscribed circle C1 and the inscribed circle C2 of the internal gear ring. The tooth groove depth is the difference between the distance from the bottom of the inner ratchet tooth to the center of the internal gear ring (i.e., the radius of the circle C3 on which the bottom of the inner ratchet tooth lies) and the radius of the inscribed circle C2 of the internal gear ring. The depth t is preferably 0.6-0.9 mm.

[0039] The structure of the inner gear ring 6 of the present invention is suitable for cold extrusion manufacturing. Preferably, in this embodiment, the inner gear ring is an integral inner gear ring formed by cold extrusion to ensure both structural strength and efficient manufacturing.

[0040] A indexing groove 31 can be provided on the nut 3, and the groove walls 32 on both sides of the indexing groove can cooperate with the keys on the inner wall of the rotating sleeve (the bushing 42 in the rotating sleeve in this embodiment), and the rotating sleeve 42 and the nut 3 are connected during the tightening process in the locked state and the loosening process after unlocking.

[0041] The inner tooth piece (61) is arc-shaped. In this embodiment, a circle of inner tooth pieces 61 is provided on the first ring-shaped base body 60 of the inner tooth ring 6, and vertical gaps 62 are provided in the inner tooth pieces 61. Refer to Figure 11 , or the inner tooth pieces 61 are not provided with gaps 62, and elastic deformation can also occur radially outward within a certain range (for example, due to the deformation of the inner tooth pieces themselves, or / and, due to the overall elastic deformation of the inner tooth ring, tilting outward).

[0042] The first ring-shaped base body 60 of the inner tooth ring 6 is placed on the step 11, and the inner tooth ring 6 is axially positioned by the part in front of it pressing on the drill body 1. The first ring-shaped base body 60 of the inner tooth ring 6 has a radially outer overhanging part 63, and the inner tooth pieces 61 are bent and arranged on the outer edge of the overhanging part 63, which can reduce the diameter of the drill body 1 while increasing the elastic deformation effect.

[0043] As Figure 12 、 13 As shown, damping oil 9 can be provided between the inner tooth pieces 61 and the inner wall of the rotating sleeve. The damping oil 9 can be coated on the outer side surface of the inner tooth pieces 61 during the assembly of the drill chuck. The damping oil 9 has high viscosity, and high-viscosity dimethyl silicone oil with a viscosity of 500,000 - 3,000,000 cs can be used, etc. It will not slide off between the gaps between the inner tooth pieces and the inner wall of the rotating sleeve. Every time the inner tooth pieces 61 squeeze the inner wall of the rotating sleeve, it will adaptively deform and fill the gaps between the inner tooth pieces 61 and the inner wall of the rotating sleeve, increasing the friction area and improving the anti-loosening effect. At the same time, it also plays a role in protecting the inner wall of the rotating sleeve and preventing it from being cut.

[0044] The locking part 5 includes a second ring-shaped base body 50. The second ring-shaped base body 50 of the locking part 5 is located between the first ring-shaped base body 60 of the inner tooth ring 6 and the rear end of the nut 3. The second ring-shaped base body 50 of the locking part 5 and the inner tooth ring 6 enclose a ring-shaped bearing steel ball cavity, and bearing steel balls 7 are arranged in the bearing steel ball cavity. The second ring-shaped base body 50 has a working surface 501 that acts backward and radially outward, and squeezes the bearing steel balls 7 radially outward during work, causing the inner tooth pieces 61 to elastically deform radially outward.

[0045] The inner gear ring 6 is positioned so as not to rotate relative to the drill body 1. A plurality of arc grooves 12 are formed on the drill body 1 by axially punching holes on its edge. The first ring-shaped base 60 of the inner gear ring 6 is a sheet-shaped ring body. During punching, an arc protrusion 65 is formed around the inner hole to cooperate with the arc groove 12 to form a circumferential fit to prevent relative rotation. Whether manufacturing the groove 12 or manufacturing and installing the inner gear ring 6, it is very convenient.

[0046] The lock element 5 has multiple locking structures disposed on its second annular base 50. Each structure comprises a spring 51 and an outward-directed control protrusion 53 connected to the spring 51. The end of the spring 51 forms a locking end 52 that tilts outward (i.e., away from the center of the circle). The inner wall of the rotating sleeve (in this embodiment, the bushing 42 within the rotating sleeve) is provided with a cam surface that engages with the outward-directed control protrusion 53, causing the locking end 52 to move away from or into the inner ratchet teeth 611. The lock element 5 also has an outward-directed connection protrusion 54 integral with the lock element, and the rotating sleeve (in this embodiment, the bushing 42 within the rotating sleeve) is provided with a connecting groove that engages with the outward-directed connection protrusion. The lock element 5 is connected to the nut 3 by a key 55 on the lock element 5 that engages with a groove 33 on the nut 3.

[0047] The nut 3 is an integral nut, and the retaining ring 8 is arranged at the front end of the nut 3. The retaining ring 8 includes an integral, continuous pressure ring body 81 and a plurality of elastic clips 82 located in a circle around the inner hole of the pressure ring body 81. The drill body 1 is provided with an annular groove 13 that cooperates with the elastic clips. The retaining ring 8 includes a pressure ring body to axially limit the nut 3. For structures using an integral nut, the axial limit of the nut usually adopts a connection method of interference fit between the rotating sleeve and the nut. In high impact and vibration environments, the nut will usually loosen, causing the claw to fall off and the overall function to fail. The retaining ring 8 structure of the utility model is not only easy to assemble but also reliable in axially limiting the integral nut, preventing the nut 3 from loosening and ensuring high output of the backward extrusion force, thereby ensuring the combination performance of the inner tooth plate 61 and the spring plate 51.

[0048] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the field of the present invention are included in the protection scope of the present invention.

[0049] It should be noted that the terms "comprising", "having" and any variations thereof in the description, claims and the above-mentioned drawings of the present utility model are intended to cover non-exclusive inclusion. The terms "mounted", "arranged", "provided with", "connected", "coupled", "socketed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "one end", "the other end", "outer side", "inner side", "horizontal", "end portion", "length", "outer end", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. The terms "first" and "second" are also used only for the sake of brevity in description, and do not indicate or imply relative importance.

Claims

1. A hand-tightening drill chuck with a locking function, which is provided with a drill body (1), a jaw (2), a nut (3), and a rotating sleeve. The nut (3) is threadedly connected to the jaw (2), and the rotating sleeve is connected to the nut (3) through a connecting structure and can drive the nut (3) to rotate. The nut is sleeved outside the drill body (1) and supported on the step in the middle of the drill body. The hand-tightening drill chuck is provided with a locking structure; it is characterized in that the locking structure includes a locking member (5) and a positioned internal gear ring (6). The locking member (5) is connected to the nut (3) and rotates synchronously with the nut (3) around the central axis of the drill body (1). The locking member (5) is provided with a spring piece (51), and the spring piece (51) has a locking end (52) that warps outward. The internal gear ring (6) includes a first ring-shaped base body (60), and the first ring-shaped base body is sleeved outside the drill body. The first ring-shaped base body (60) is provided with internal gear pieces (61) that can elastically deform radially outward and are in extrusion fit with the rotating sleeve. The outer side surface of the internal gear piece (61) is provided with a wavy arc-shaped protrusion (64) along the circumferential direction. The internal gear piece (61) is provided with internal ratchet teeth (611) facing radially inward. The internal ratchet teeth (611) cooperate with the locking end (52). The rotating sleeve is provided with a structure for controlling the locking end (52). An extrusion structure is provided between the nut (3) and the step of the drill chuck. During the rotation operation of the drill chuck, the extrusion structure squeezes the internal gear ring backward and radially outward based on the reaction force received by the nut, pushing the internal gear piece (61) to elastically deform and open radially outward, so that the wavy arc-shaped protrusion (64) is tightly pressed against the inner wall of the rotating sleeve.

2. The hand-tight drill chuck with a locking function according to claim 1, characterized in that, The apex angle of the locking end (52) is less than or equal to 90°, the base angle of the internal ratchet teeth is less than or equal to 90°, and the base angle of the internal ratchet teeth (611) is greater than or equal to the apex angle of the locking end (52).

3. The hand-tight drill chuck with a locking function according to claim 2, characterized in that, The apex angle of the locking end (52) is 60 - 75°.

4. A hand-tightening drill chuck with a locking function according to claim 1, 2 or 3, characterized in that, The depth t of the tooth groove on the internal gear ring is ≥ 40% of the total thickness T of the internal gear ring. The total thickness refers to the radius difference between the circumscribed circle and the inscribed circle of the internal gear ring, and the depth of the tooth groove refers to the difference between the distance from the bottom of the internal ratchet teeth to the center of the circle of the internal gear ring and the radius of the inscribed circle of the internal gear ring.

5. The hand-tight drill chuck with a locking function according to claim 4, characterized in that, The depth t ≥ 0.5 mm.

6. A hand-tightening drill chuck with a locking function according to claim 1, 2 or 3, characterized in that The internal gear ring is an integrally formed internal gear ring formed by cold extrusion.

7. The hand-tight drill chuck with a locking function according to claim 1, characterized in that, The nut (3) is an integral nut. The drill chuck is provided with a snap ring (8), and the snap ring (8) is arranged at the front end of the nut (3). The snap ring (8) includes an integrally formed and non-disconnected pressing ring body (81) and a plurality of elastic cards (82) arranged in a circumferential circle in the inner hole of the pressing ring body (81). The drill body (1) is provided with an annular groove (13) that cooperates with the elastic cards (82).

8. The hand-tightening drill chuck with a locking function according to claim 1, characterized in that, The internal gear piece (61) is arc-shaped. A circle of internal gear pieces is arranged on the first ring-shaped base body (60) of the internal gear ring (6), and a plurality of vertical gaps (62) are arranged in the circle of internal gear pieces (61) to form the internal gear piece (61).

9. The hand-tightening drill chuck with a locking function according to claim 1, characterized in that, The first ring-shaped base (60) of the inner gear ring (6) is placed on the step; the first ring-shaped base (60) of the inner gear ring (6) has a radially outer hollow portion (63), and the inner tooth piece (61) is bent and arranged at the outer edge of the hollow portion (63).

10. A hand-tightening drill chuck with a locking function according to claim 9, characterized in that, A ring-shaped bearing steel ball cavity is provided between the inner gear ring (6) and the nut (3), and a bearing steel ball (7) is arranged in the bearing steel ball cavity. The bearing steel ball cavity has an action surface facing backward and radially outward, and when working, the bearing steel ball is squeezed radially outward and the inner gear piece (61) is elastically deformed radially outward.

11. A hand-tight drill chuck with a locking function according to claim 10, characterized in that, The locking member (5) includes a second annular base (50), the second annular base (50) of the locking member (5) is located between the first annular base (60) of the inner gear ring (6) and the rear end of the nut (3), the second annular base (50) of the locking member (5) and the inner gear ring (6) together enclose the annular bearing steel ball cavity, and the second annular base (50) of the locking member (5) is provided with the rearward and radially outward action surface (501).

12. The hand-tightening drill chuck with a locking function according to claim 1, characterized in that, The inner gear ring (6) forms a circumferential fit with the drill body (1) to prevent relative rotation through the radially inward protrusion of the inner hole wall of its first ring-shaped base (60).

13. A locking drill chuck with a locking function as described in claim 12, characterized in that, The drill body (1) is provided with a plurality of arc grooves (12) by axially punching holes at its edge. The first ring-shaped base (60) of the inner gear ring (6) is a sheet-shaped ring body, and an arc protrusion (65) is formed around its inner hole to match the arc grooves (12).

14. The hand-tight drill chuck with a locking function according to claim 1, characterized in that, The locking element (5) comprises a second ring-shaped base (50), and a plurality of locking structures are arranged on the second ring-shaped base (50) of the locking element (5), each locking structure comprising the spring piece (51) and an outward control protrusion (53) connected to the spring piece (51), the end of the spring piece (51) being the outward-curved locking end (52), the inner wall of the rotating sleeve being provided with a cam surface for controlling and cooperating with the outward control protrusion (53), the locking element (5) being further provided with an outward connecting protrusion (54) integral with the locking element, and the rotating sleeve being provided with a connecting groove for cooperating with the outward connecting protrusion (54).

15. A hand-tightening drill chuck with a locking function according to claim 1, characterized in that, The inner gear ring (6) is subjected to a heat treatment and hardening treatment after forming.

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