Self-locking drill chuck

Abstract

The utility model provides a kind of self-locking drill chuck, including rotating sleeve, drill body, nut, clamping jaw, self-locking structure, the drill chuck is also provided with positioning structure, the positioning structure includes spring piece and convex positioning block, the convex positioning block is located in the inner wall of rotating sleeve and protrudes to inboard, the spring piece is synchronous with nut in circumferential direction and from the inboard of the convex positioning block, the spring piece is located in the inboard of the convex positioning block, the spring piece is provided with the locking positioning inner groove of the bending formation corresponding the convex positioning block, the convex positioning block when drill chuck is in locking state, turn to fall into the locking positioning inner groove;The spring piece is also provided with the unlocking state cooperation groove of the bending formation corresponding the convex positioning block in the locking positioning inner groove, the convex positioning block when drill chuck is in unlocking position state, turn to fall into the unlocking state cooperation groove.The utility model can improve the positioning performance of positioning structure.

Description

Technical Field

[0001] This utility model relates to a self-locking drill chuck. Background Technology

[0002] In existing technology, drill chucks include a drill body, jaws, a nut, bearings, washers, and a rotating sleeve. The rotating sleeve drives the nut to rotate via a connecting structure, thereby driving the jaws to move forward or backward, thus clamping or releasing the drill bit. The self-locking structure in a drill chuck is designed to prevent the drill bit from loosening due to reaction forces during operation. It typically consists of a spring and external teeth located on the drill body or other fixed structures. However, with the continuous increase in the power of hand drills, the vibration experienced by the drill chuck during operation may not only cause the drill bit to loosen but may also cause it to become increasingly clamped, resulting in a situation where the drill bit cannot be disassembled after work is completed.

[0003] Currently, this problem is addressed using a positioning structure. The spring is equipped with a positioning protrusion, and the inner wall of the rotating sleeve has grooves corresponding to the locked and unlocked states. The positioning protrusion falls into the corresponding groove in the locked and unlocked states respectively to maintain the desired state. However, in practice, the edges of the grooves on the rotating sleeve experience concentrated stress during frequent rotation, and the injection-molded material is prone to wear due to repeated friction, reducing positioning accuracy. Furthermore, the small contact area between the groove and the mating component results in high unit pressure, accelerating wear. Additionally, due to the limited wall thickness of the rotating sleeve, insufficient groove depth or a shallow design can lead to insufficient positioning force. Metal shavings or dust can easily accumulate in the grooves of the rotating sleeve, hindering complete engagement of the positioning spring and leading to the risk of incomplete locking or accidental unlocking. Utility Model Content

[0004] The purpose of this invention is to provide a self-locking drill chuck that improves the positioning performance of the positioning structure. To this end, this invention adopts the following technical solution:

[0005] A self-locking drill chuck includes a rotating sleeve, a drill body, a nut, jaws, and a self-locking structure. The rotating sleeve is connected to the nut via a connecting structure and can drive the nut to rotate. The drill chuck also includes a positioning structure, characterized in that the positioning structure includes a spring and a convex positioning block. The convex positioning block is located on the inner wall of the rotating sleeve and protrudes inward. The spring moves synchronously with the nut in the circumferential direction and passes through the inner side of the convex positioning block. The spring is located inside the convex positioning block and has a locking positioning groove formed by the bending of the convex positioning block. When the drill chuck is in the locked state, the convex positioning block rotates and falls into the locking positioning groove. Next to the locking positioning groove, the spring also has an unlocking state mating groove formed by the bending of the convex positioning block. When the drill chuck is in the unlocked position, the convex positioning block rotates and falls into the unlocking state mating groove.

[0006] Based on the above technical solutions, the present invention may also adopt the following further technical solutions, or combine these further technical solutions:

[0007] The locking positioning groove and the unlocking groove are separated by an arc-shaped curved protrusion on the spring.

[0008] When the convex positioning block moves from the unlocked state into the locking positioning inner groove, a notch is provided on the top of the protrusion facing the arc-shaped curved protrusion.

[0009] The spring is mounted on a ring-shaped component, which is a nut or a component connected to a nut.

[0010] The spring is located at the front end of the nut.

[0011] The locking positioning groove and the unlocking state mating groove are configured as a continuous spring segment separated by the arc-shaped curved protrusion, and the two ends of the continuous spring segment are respectively connected to the two keys of the ring-shaped component and supported by the two keys. The connection part with the keys constitutes the other side of the groove wall of the locking positioning groove and the unlocking state mating groove, and the arc-shaped curved protrusion constitutes one side of the groove wall of the locking positioning groove and the unlocking state mating groove.

[0012] Both ends of the continuous spring segment are connected to the key from the radially outer side.

[0013] The convex positioning block is a sector-shaped block with an inner arc surface.

[0014] The central angle of the convex positioning block is 5°-12°.

[0015] The spring has multiple sets of locking and positioning grooves that engage with the unlocked state grooves.

[0016] This invention employs a spring plate on the nut to provide an inner groove, while a convex positioning block is provided on the inner wall of the rotating sleeve, forming the positioning structure. The positioning block is easier to enlarge, and its contact area with the mating parts is larger than in previous designs, effectively distributing loads and reducing localized stress. Furthermore, the depth of the inner groove of the spring plate on the nut, when positioned at the front end of the nut, offers greater flexibility. The positioning block forms a shearing motion trajectory with the mating surface, automatically scraping away surface contaminants during rotation. Contaminants are also less likely to accumulate in the radially outward-facing inner groove of the spring plate, maintaining the long-term reliability of the positioning structure. Moreover, this invention offers high machining tolerance; compared to the deep and narrow structure with positioning grooves on the inner wall of the rotating sleeve, the block-like feature makes tolerance control easier. In summary, the technical solution of this invention improves the performance of the positioning structure in multiple ways, making the drill chuck more reliable. Attached Figure Description

[0017] Figure 1 This is an exploded view of Embodiment 1 of this utility model.

[0018] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model.

[0019] Figure 3 , 4 These represent the locked and unlocked states of Embodiment 1 of this utility model, respectively. Figure 2 AA sectional view.

[0020] Figure 5 In Example 1, the spring is implemented in another way. Figure 2 AA sectional view.

[0021] Figure 6 This is an exploded view of Embodiment 2 of this utility model.

[0022] Figure 7 This is a cross-sectional view of Embodiment 2 of the present invention.

[0023] Figure 8 This is an exploded view of Embodiment 3 of this utility model.

[0024] Figure 9 This is a cross-sectional view of Embodiment 3 of the present invention. Detailed Implementation

[0025] See attached document Figure 1-4 This utility model provides a self-locking drill chuck, comprising a rotating sleeve 2, a drill body 1, a nut 3, a jaw 4, and a self-locking structure. The rotating sleeve 2 is connected to the nut via a connecting structure and can drive the nut to rotate. Reference numeral 20 in the attached drawing represents the outer shell of the rotating sleeve.

[0026] The drill chuck is also provided with a positioning structure, which includes a spring piece 5 and a convex positioning block 21. The convex positioning block 21 is located on the inner wall of the rotating sleeve 2 and protrudes inward. The spring piece 5 is synchronized with the nut 3 in the circumferential direction and passes through the inner side of the convex positioning block 21. The spring piece 5 is provided with a locking positioning inner groove 51 corresponding to the bending of the convex positioning block 21. When the drill chuck is in the locked state, the convex positioning block 21 rotates and falls into the locking positioning inner groove 51. Next to the locking positioning inner groove 51, the spring piece 5 is also provided with an unlocking state mating groove 52 corresponding to the bending of the convex positioning block 21. When the drill chuck is in the unlocked position, the convex positioning block 21 rotates and falls into the unlocking state mating groove 52.

[0027] The locking positioning groove 51 and the unlocked state mating groove 52 are separated by the arc-shaped curved protrusion 53 on the spring piece, which can be adjusted to the required full height and bending angle as needed, which is very convenient.

[0028] The spring piece 5 is mounted on the ring-shaped component. In this embodiment, the nut 3 is circumferentially positioned in the nut groove 11 in the middle of the drill body. The nut 3 has a two-part structure. After being installed in the nut groove 11, it is connected to the two-part nut by the nut sleeve 30 to form a complete nut. The spring piece 5 can be directly mounted on the nut or connected to the nut sleeve 30.

[0029] The spring piece 5 is located at the front end of the nut, and takes advantage of the smaller diameter of the front part of the drill body 1 to provide a larger inward deformation space for the spring piece 5. In this embodiment, several keys 31 are provided at the front end of the nut to install the spring piece 5.

[0030] The locking positioning groove 51 and the unlocking state mating groove 52 are configured as a continuous spring segment separated by the arc-shaped curved protrusion 53. Both ends of this continuous spring segment are connected to and supported by two keys 31 at the front end of the nut. The connecting portions 541 and 542 with the keys 31 form the other side wall of the locking positioning groove 51 and the unlocking state mating groove 52. The arc-shaped curved protrusion 53 forms one side wall of the locking positioning groove 51 and the unlocking state mating groove 52. Therefore, the above structure can also serve as a drive connection structure for the nut 3 and the rotating sleeve 2, and provides a more noticeable switching feel when switching between the locked and unlocked states. Furthermore, a notch 211 can be provided at the top of the protrusion facing the arc-shaped curved protrusion 53 when the convex positioning block 21 enters the locking positioning groove 51 from the unlocking state mating groove 52, further improving the smoothness of operation. This provides a drive connection function without hindering positioning performance.

[0031] The two ends 541 and 542 of the continuous spring segment are connected to the key 31 from the radially outer side.

[0032] The convex positioning block 21 is a fan-shaped block with an inner arc surface. It has better matching performance with the arc-shaped spring piece 5. By adopting the solution of this utility model, the convex positioning block can easily have a certain length, increasing the contact area with the mating parts. In this embodiment, the central angle of the convex positioning block can be made up to 12°.

[0033] like Figure 3 , 4 As shown, the spring piece 5 has multiple sets of locking and positioning grooves 51 and unlocked grooves 52.

[0034] The self-locking structure includes a spring plate, i.e., a locking end 55 disposed at the end of the spring plate, and a toothed ring 10 that cooperates with the locking end 54 of the spring plate. The toothed ring 10 is disposed at the front end of the drill body 1. Figure 3 , 4 The spring piece 5 can also serve as a self-locking spring piece. The spring piece 5 is a single piece, equipped with multiple sets of locking and positioning grooves 51 and unlocking grooves 52, and also includes the locking end 5. For example... Figure 5 As shown, the spring 5 can also be divided into multiple segments, one of which is equipped with a locking end 55.

[0035] In this embodiment, the nut 3 is supported on the central step 12 of the drill body 1 by a bearing ring 6 and a washer 7. Figure 6 , 7 As shown, in this embodiment, a lower retaining ring 81 and an upper retaining ring 82 are used to form an annular cavity, and a ring of steel balls 83 is set in the annular cavity. The nut 3 is supported on the step 12 in the middle of the drill body by this structure. Other parts of this embodiment are the same as those shown. Figure 1-5 The embodiments shown have the same structure.

[0036] Reference Figure 8 , 9 In this embodiment, the nut is a solid nut, with other parts being integrated with it. Figure 1-5 The embodiments shown have the same structure.

[0037] 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.

[0038] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this utility model are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "linked," and "sleeve" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In the description of this utility model, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this 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 self-locking drill chuck, comprising a rotating sleeve (2), a drill body (1), a nut (3), a jaw (4), and a self-locking structure, wherein the rotating sleeve (2) is connected to the nut (3) via a connecting structure and can drive the nut (3) to rotate; the drill chuck is further provided with a positioning structure, characterized in that, The positioning structure includes a spring piece (5) and a convex positioning block (21). The convex positioning block (21) is located on the inner wall of the rotating sleeve (2) and protrudes inward. The spring piece (5) moves synchronously with the nut (3) in the circumferential direction and passes through the inner side of the convex positioning block (21). The spring piece (5) is provided with a locking positioning inner groove (51) formed by the bending of the convex positioning block (21). When the drill chuck is in the locked state, the convex positioning block (21) rotates and falls into the locking positioning inner groove (51). The spring piece (5) is also provided with an unlocking state mating groove (52) formed by the bending of the convex positioning block (21) next to the locking positioning inner groove (51). When the drill chuck is in the unlocked position, the convex positioning block (21) rotates and falls into the unlocking state mating groove (52).

2. The self-locking drill chuck as described in claim 1, characterized in that, The locking positioning groove (51) and the unlocking state mating groove (52) are separated by the arc-shaped curved protrusion (53) on the spring.

3. A self-locking drill chuck as described in claim 2, characterized in that, The convex positioning block (21) has a notch (211) on the top of the protrusion facing the arc-shaped curved protrusion (53) when it enters the locking positioning inner groove (51) from the unlocked state mating groove (52).

4. A self-locking drill chuck as described in claim 2 or 3, characterized in that, The spring piece (5) is mounted on a ring-shaped component, which is a nut (3) or a component connected to a nut.

5. A self-locking drill chuck as described in claim 1, 2, or 3, characterized in that, The spring piece (5) is located at the front end of the nut (3).

6. A self-locking drill chuck as described in claim 4, characterized in that, The locking positioning groove (51) and the unlocking state mating groove (52) are configured as a continuous spring segment separated by the arc-shaped curved protrusion (53), and the two ends of the continuous spring segment are respectively connected to the two keys (31) of the ring component and supported by the two keys (31). The connection part with the key (31) constitutes the other side of the groove wall of the locking positioning groove (51) and the unlocking state mating groove (52). The arc-shaped curved protrusion (53) constitutes one side of the groove wall of the locking positioning groove (51) and the unlocking state mating groove (52).

7. A self-locking drill chuck as described in claim 6, characterized in that, Both ends of the continuous spring segment are connected to the key (31) from the radially outer side.

8. A self-locking drill chuck as described in claim 1, characterized in that, The convex positioning block (21) is a sector-shaped block with an inner arc surface.

9. A self-locking drill chuck as described in claim 1 or 8, characterized in that, The central angle of the convex positioning block (21) is 5°-12°.

10. A self-locking drill chuck as described in claim 9, characterized in that, The spring piece (5) has multiple sets of locking and positioning grooves (51) and unlocked state matching grooves (52).

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