High strength self-locking drill chuck

Abstract

The utility model provides a kind of high-strength self-locking drill chuck, including rotating sleeve, drill body, nut, clamping jaw, gasket, a circle of ball, self-locking structure, the outside of gasket has the arc-shaped bending flanging of forward, and the tooth of self-locking structure is set in the outside of arc-shaped bending flanging, the arc-shaped bending flanging can be extruded by the circle of ball to outside when drill chuck works.The utility model can use gasket as the base body of gear ring setting, and adopt external tooth structure, improve structural strength, and, compared with end external tooth, the tooth surface is large using the structure of the utility model, in work, gear ring is also extruded by bearing steel ball and has the tendency to outward, and the engagement force with spring piece lock end is stronger, and, in work, the extrusion force of bearing steel ball received by ring-like component is the inward direction opposite to the force acting on gear ring, can further improve the engagement effect of spring piece and gear ring in work, improve self-locking performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to a self-locking drill chuck. BACKGROUND

[0002] The drill chuck is provided with a drill body, a clamping jaw, a nut and a rotating sleeve, the nut is threadedly connected with the clamping jaw, the rotating sleeve is directly connected with the nut or connected with the nut through a connecting structure, the rotating sleeve is manually operated to rotate the nut so as to drive the clamping jaw to move forward or backward to clamp or release the drill bit.

[0003] At present, the common self-locking structure has a gear ring directly arranged on the drill body, but the hardness of the drill body is quite different from that of the elastic sheet, and the gear is prone to wear and failure. At present, there is a scheme of arranging the gears on the gasket by taking advantage of the fixed connection between the gasket and the drill body, but the self-locking force is limited when the gears are arranged as internal gears, or the gears are arranged on the outer side surface of the gasket, and the cooperation effect needs to be improved. SUMMARY

[0004] The utility model discloses a high-strength self-locking drill chuck, which can further improve the cooperation effect of the self-locking structure in which the gears are arranged on the gasket and cooperate with the locking end of the elastic sheet. To this end, the utility model adopts the following technical scheme A high-strength self-locking drill chuck comprises a rotating sleeve, a drill body, a nut, a clamping jaw, a gasket, a circle of balls and a self-locking structure. The gasket is arranged on the middle step of the drill body and positioned on the drill body in the circumferential direction and cannot rotate relative to the drill body. The self-locking structure comprises a circle of gears and an elastic sheet. The elastic sheet is provided with a locking end. The elastic sheet is arranged on a circle-shaped component. The circle-shaped component and the nut are connected together. The nut is supported on the middle step through the circle of balls and the gasket. The gasket is characterized in that the outer side of the gasket is provided with an arc-shaped bent flange in the forward direction, and the circle of gears is arranged on the outer side of the arc-shaped bent flange. The arc-shaped bent flange can be extruded outward by the circle of balls when the drill chuck is working.

[0005] On the basis of the above technical scheme, the utility model can also adopt the following further technical schemes, or use these further technical schemes in combination: The ring-shaped component and the elastic sheet are integrally formed on the same plate, the ring-shaped component has a side wall and a front platform inside the ring of balls, the side wall and the front platform are connected by a circular arc, the side wall and the front platform together with the gasket with the arc-shaped bent flange internally enclose the ring of balls, and the ring-shaped component is matched with the rear part of the nut at the front platform of the ring of balls.

[0006] The gasket has a ring of overhangs over the middle step, so that the arc-shaped bent flange is bent forward at the overhangs, and at least part of the balls are located at the overhangs.

[0007] The ring-shaped component further has a second elastic sheet, the second elastic sheet has a positioning protrusion radially outward, the inner wall of the rotating sleeve has a first groove and a second groove matched with the positioning protrusion, when the self-locking chuck is in the self-locking state, the positioning protrusion is located in the first groove, and when the positioning protrusion is located in the second groove, the self-locking chuck is in the unlocked state.

[0008] The rear end surface of the nut is provided with an arc surface facing outward and forms a sunken platform surface, the arc surface is matched with the circular arc between the side wall and the front platform, and the sunken platform surface is matched with the platform.

[0009] The hardness of the gasket is higher than that of the drill body.

[0010] The front section of the ring-shaped component is a nut sleeve, the nut sleeve is wrapped outside the nut and fixedly connected with the nut The ring-shaped component is provided with a key, the key is matched with a groove on the nut to connect the ring-shaped component and the nut in the circumferential direction.

[0011] The key is cantilevered and bent forward on the ring-shaped component, the outer side of the key protrudes radially beyond the groove, there is a gap for the key to be deformed under pressure relative to the bottom of the groove, and the outer side surface of the key abuts against the inner surface of the rotating sleeve.

[0012] The side wall and the surface of the nut facing each other form a radial positioning matching structure of the ring-shaped component.

[0013] By adopting the technical solution of this utility model, the present utility model can use a washer as the base for setting the toothed ring and adopt an external tooth structure. Compared with the drill body, the material of the washer is closer to that of the spring, resulting in good compatibility and improved structural strength. Furthermore, with the structure of this utility model, the tooth surface is larger than that of the end external teeth. During operation, the toothed ring will also be squeezed outward by the bearing steel balls, resulting in a stronger meshing force with the locking end of the spring. Moreover, during operation, the squeezing force of the bearing steel balls on the ring-shaped component is in the inward direction opposite to the force acting on the toothed ring, which can further improve the meshing effect of the spring and the toothed ring during operation and improve the self-locking performance. Attached Figure Description

[0014] Figure 1 This is an exploded view of the structure of an embodiment of the present utility model.

[0015] Figure 2 for Figure 1 A cross-sectional view of the embodiment shown.

[0016] Figure 3 for Figure 1 A schematic diagram of the combination of the nut and locking structure in the embodiment shown.

[0017] Figure 4 for Figure 1 A schematic diagram of the washer in the illustrated embodiment.

[0018] Figure 5 for Figure 1 A schematic diagram of the ring-shaped component in the illustrated embodiment.

[0019] Figure 6 When in a self-locking state, Figure 2 AA sectional view.

[0020] Figure 7 When in the unlocked state, Figure 2 AA sectional view.

[0021] Figure 8 This is a schematic diagram of an implementation method for combining a ring-shaped component with a nut sleeve.

[0022] Figure 9 This is a schematic diagram of another embodiment of the ring-shaped component combined with a nut.

[0023] Figure 10 for Figure 9 A sectional view.

[0024] Figure 11 This is a cross-sectional view of another embodiment of the present invention.

[0025] Figure 12 for Figure 11 A schematic diagram of the combination of the nut and locking structure in the embodiment shown.

[0026] Figure 13 For Figure 11 The sectional view of the combined structure of the nut and the locking structure of the embodiment shown.

[0027] Figure 14 For Figure 11 The B-B sectional view.

[0028] Figure 15 For another embodiment based on the embodiment shown in Figures 11-14 The combined schematic diagram of the nut and the locking structure of another embodiment of the utility model. DETAILED DESCRIPTION

[0029] With reference to the drawings. The utility model provides a kind of high-strength self-locking drill chuck, including rotating sleeve, drill body 1, nut 3, jaw 4, washer 5, a circle of ball 6, self-locking structure, the rotating sleeve includes shell 21 and inner sleeve 22 fixed together.

[0030] The washer 5 is positioned on the drill body middle step 10 and cannot rotate relative to drill body in circumferential direction, and specifically can be positioned in circumferential direction by the cooperation of the key 51 and the groove on the drill body 1.

[0031] The self-locking structure includes a circle of teeth 52 and spring piece 71, the spring piece 71 is provided with lock end 710, the spring piece 71 is arranged on the ring component 7, in implementation, the spring piece can be arranged multiple, is evenly arranged along circumferential direction, the ring component 7 and nut 3 are connected together, and the nut 3 is supported on the middle step 10 by the a circle of ball 6 and washer 5.

[0032] The washer 5 has a circle of arc-shaped bending flanging 53 towards the outside, and the a circle of teeth 52 is arranged on the outside of the arc-shaped flanging, to form the tooth ring with washer function, and the hardness of the metal plate used by the washer 5 is higher than that of the drill body 1, so as to automatically enhance the hardness of the tooth ring and increase the self-locking structure. By using the structure of the utility model, the arc-shaped bending flanging 53 can be extruded outward by the a circle of ball 6 when the drill chuck works. The tooth ring with washer function is provided with jaw accommodating hole 54 to reduce the outer diameter, so that the spring piece 71 can have better space to cooperate with the a circle of teeth 52.

[0033] The ring component 7 and the spring piece 71 thereon are integral structure formed on the same plate material, the ring component 7 has inner wall 72 located on the inside of the a circle of ball 6 and platform portion 721 on front side to wrap the a circle of ball inside together with the washer 5 provided with arc-shaped flanging 53, and the platform portion 721 of the ring component 7 on the front side of the a circle of ball is padded behind the nut 3.

[0034] The gasket 5 has a ring of overhangs 55 overhanging the middle step 10, so that the arc-shaped bent-over flange 53 is bent over forward of the overhangs 55, and at least some of the balls are located in the overhangs 55.

[0035] The ring-shaped member 7 is provided with keys 73 which cooperate with the slots 31 in the nut 3 to connect the ring-shaped member 7 to the nut 3 in the circumferential direction.

[0036] The ring-shaped member 7 is also provided with a second spring 8 which is provided with a radially outwardly directed positioning projection 81, and the inner wall of the rotating sleeve is provided with a first recess 75 and a second recess 76 which cooperate with the positioning projection 81, when the chuck is in the self-locking state, the positioning projection 81 is located in the first recess 75 to strengthen the holding force of the locking structure in the self-locking position, and when the positioning projection 81 is located in the second recess 76, the chuck is in the unlocked state.

[0037] As shown in Figure 8 , as another embodiment, the front end of the ring-shaped member 7 is a nut sleeve 9 which is wrapped around the outside of the nut 3 and is fixedly connected to the nut 3.

[0038] Referring to Figure 9 , 10 , in this embodiment, the rear end face of the nut 3 is provided with an outwardly facing arc surface 32 to form a counterbore surface 33, the arc surface 32 cooperates with the circular arc 722 between the side wall 72 and the front platform portion 721, and the counterbore surface 33 cooperates with the platform portion 721, thereby further improving the stability of the ring-shaped member 7 and the spring 71 and improving the self-locking performance, Figure 9 , Figure 10 , the other parts are the same as the relevant parts in the embodiment shown in Figures 1-7 .

[0039] The ring-shaped member 7 is provided with keys 73a which cooperate with the slots 31 in the nut 3 to connect the ring-shaped member 7 to the nut 3 in the circumferential direction. The keys 73a are cantilevered and bent over forward of the ring-shaped member 7 to have radial elasticity, and the keys 73a are provided with a plurality of radially extending grooves 73b which cooperate with the slots 31 in the nut 3 to connect the ring-shaped member 7 to the nut 3 in the circumferential direction. Figures 11-14In this embodiment, the outer radial side of the key 73a protrudes from the groove 31, and there is a gap 730 relative to the bottom 310 of the groove 31 for the key 73a to deform under pressure. The outer surface of the key 73a abuts against the inner surface of the rotating sleeve (the inner surface of the inner sleeve 22), thereby increasing the unlocking force, improving the stability of the rotating sleeve, and reducing vibrations to the self-locking structure, thus mitigating the risk of loosening under extreme conditions. Alternatively, the outer diameter of the ring-shaped component can be made slightly larger so that the outer radial side of the key 73a protrudes from the groove 31 and has a gap 730 between it and the bottom 310; or, the bending angle of the key 73a can be slightly less than 90° so that its outer radial side protrudes from the groove 31.

[0040] The rear end face of the nut 3 has an outward-facing arc surface 32 forming a recessed platform surface 33. The arc surface 32 mates with the arc 722 between the side wall 72 and the front platform portion 721. The recessed platform surface 33 mates with the platform portion 721. The side wall 72 and the nut surface 34 it faces (which may also include a part of the arc surface 32) form a radial positioning mating structure for the ring-shaped component 7, thereby further improving the stability of the ring-shaped element 7 and the spring piece 71 and enhancing the self-locking performance. Figures 11-14 Other parts of the illustrated embodiment and Figures 1-7 as well as Figure 9 , Figure 10 The relevant parts in the embodiments described are consistent.

[0041] Reference Figure 15 In this embodiment, the length of key 73b is greater than that of key 73b. Figures 11-14 The key 73a in the embodiment shown is short, but still has radial elasticity. It still protrudes out of the groove 31 on the outside and is stuck in the groove 31 on the inside. There is a gap 730 between the key 73a and the bottom of the groove 310 for the key 73b to be deformed by pressure.

[0042] In this embodiment, the rotating sleeve drives the nut 3 in a series of movements and structures, including clamping the drill bit, entering a self-locking state and continuing to clamp the drill bit, as well as unlocking and loosening the nut. The cam surface provided in the inner sleeve 22 of the rotating sleeve controls the spring 7 to approach the protrusion 74 of the locking end 710 to control the locking end 710. These are all existing technologies and are not the focus of this utility model. The implementation structures of these in self-locking drill chucks can all be applied to this utility model.

[0043] The above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the protection scope of the present utility model.

[0044] It should be noted that the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the above drawings are intended to cover a non-exclusive inclusion. The terms "mounting", "setting", "providing", "connecting", "connecting", "sleeving" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the description of the present application, it should be understood that the terms "one end", "the other end", "outer side", "inner side", "horizontal", "end", "length", "outer end", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second" are only used for simplicity in description, and do not indicate or imply relative importance.

[0046] In addition, in the practice of the claims of the present application, those skilled in the art can understand and affect the changes of the disclosed embodiments by studying the drawings, disclosure and attached claims. In addition, in the claims, the description, "including", "containing" and the like do not exclude other elements or steps, and the singular does not exclude its plural form.

Claims

1. A high-strength self-locking drill chuck, comprising a rotating sleeve, a drill body (1), a nut (3), a jaw (4), a washer (5), a ring of balls (6), and a self-locking structure, wherein the washer (5) is disposed on a step (10) in the middle of the drill body and is circumferentially positioned on the drill body and cannot rotate relative to the drill body, the self-locking structure comprises a ring of teeth (52) and a spring (71), the spring (71) being provided with a locking end (710), the spring (71) being disposed on a ring-shaped component (7), the ring-shaped component (7) and the nut (3) being connected together, the nut (3) being supported on the step (10) in the middle by the ring of balls (6) and the washer (5); characterized in that, The outer ring of the washer (5) has a forward-curved flange (53), and a ring of teeth (52) is provided on the outer side of the curved flange (53). The curved flange (53) can be squeezed outward by the ring of balls (6) when the drill chuck is working.

2. The high-strength self-locking drill chuck as described in claim 1, characterized in that, The ring-shaped component (7) and the spring piece (71) thereon are integral structures formed on the same piece of plate. The ring-shaped component (7) has a side wall (72) located inside the ring of balls (6) and a platform portion (721) on the front side. The side wall (72) and the platform portion (721) on the front side are connected by an arc. The side wall (72) and the platform portion (721) on the front side together with the washer (5) with an arc-shaped bend flange (53) enclose the ring of balls (6) inside. The platform portion of the ring-shaped component (7) located in front of the ring of balls (6) cooperates with the rear part of the nut.

3. A high-strength self-locking drill chuck as described in claim 1, characterized in that, The washer (5) has a suspended portion (55) that is suspended above the central step, such that the arc-shaped bend flange (53) is turned forward in the suspended portion (55), and at least a portion of the ball is located in the suspended portion (55).

4. A high-strength self-locking drill chuck as described in claim 1, characterized in that, The ring-shaped component (7) is also provided with a second spring plate (8), and the second spring plate (8) is provided with a radially outward positioning protrusion (81). The inner wall of the rotating sleeve is provided with a first groove (75) and a second groove (76) that cooperate with the positioning protrusion. When the self-locking drill chuck is in the self-locking state, the positioning protrusion (81) is located in the first groove (75). When the positioning protrusion (81) is located in the second groove (76), the self-locking drill chuck is in the unlocked state.

5. A high-strength self-locking drill chuck as described in claim 2, characterized in that, The rear end face of the nut is provided with an outward-facing arc surface (32) and forms a recessed platform surface (33). The arc surface (32) is engaged with the arc (722) between the side wall (72) and the front platform portion (721). The recessed platform surface (33) is engaged with the platform portion (721).

6. A high-strength self-locking drill chuck as described in claim 1, characterized in that, The washer (5) is harder than the drill body (1).

7. A high-strength self-locking drill chuck as described in claims 1, 2, 3, 4, 5, or 6, characterized in that, The front section of the ring-shaped component (7) is a nut sleeve (9), which wraps around the outside of the nut (3) and is fixedly connected to the nut (3).

8. A high-strength self-locking drill chuck as described in claim 1, 2, 3, 4, 5, or 6, characterized in that, A key (73) is provided on the ring-shaped component (7), and the key (73) cooperates with the groove (31) on the nut (3) to connect the ring-shaped component (7) and the nut (3) in the circumferential direction.

9. A high-strength self-locking drill chuck as described in claim 8, characterized in that, The key (73) is bent forward in a cantilever shape on the ring-shaped component (7), the outer side of the key protrudes radially from the groove (31), and there is a gap (730) relative to the bottom of the groove (310) for the key (73) to be deformed by pressure, and the outer side of the key (73) abuts against the inner surface of the rotating sleeve.

10. A high-strength self-locking drill chuck as described in claim 5, characterized in that, The sidewall (72) and the nut surface it faces form a radial positioning fit structure for the ring-shaped component (7).

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