Locking drill chuck
By introducing the axial limit and radial drive parts of the locking mechanism into the drill chuck and combining them with friction-reducing parts, the problem of balancing locking performance and flexibility is solved, a more stable locking and anti-loosening effect is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202422822645.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The locking performance and flexibility of existing locking drill chucks are difficult to balance. Insufficient elastic force of the pawl of the locking mechanism affects the locking performance, while excessive elastic force of the pawl affects the flexibility of the drill chuck.
By setting a locking mechanism between the drill body and the front sleeve, including an axial limiting part and a radial driving part, the nut is threadedly connected to the clamping jaw, and combined with a friction reducing part, the synchronous rotation and axial limiting of the clamping jaw are achieved, thereby improving the locking performance and anti-loosening effect.
The locking performance and anti-loosening effect of the drill chuck are improved, the stability and safety of the drill chuck during use are ensured, accidental loosening is avoided, and the structure is simple and the cost is low.
Smart Images
Figure CN223368287U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of drill chucks, and more particularly relates to a locking drill chuck. Background Art
[0002] In the prior art, the locking drill chucks that appear on the market usually have a complex structure, and the end face tooth locking mechanism of the drill chuck and the connected ratchet are not limited in the axial direction and can move axially, so that they can be freely separated during the movement. As a result, the elastic force of the locking pawl of the locking mechanism needs to be made weaker, which in turn affects the locking performance of the drill chuck. If the elastic force of the pawl is set to be stronger, the flexibility of the drill chuck will be affected. Utility Model Content
[0003] The utility model aims to solve the technical problems existing in the prior art and provides a locking drill chuck.
[0004] In order to solve the above technical problems, the utility model includes a drill body, a nut, a clamping claw and a front sleeve. A locking mechanism is arranged between the drill body and the front sleeve. The locking mechanism is connected to the nut. The locking mechanism is sleeved on the outer periphery of the drill body. The locking mechanism is provided with an axial limiting portion and a radial driving portion that cooperate with the nut. The inner peripheral side of the nut is threadedly connected to the clamping claw, and the outer peripheral side of the nut is press-fitted with the axial limiting portion of the locking mechanism through a limiting matching portion. A friction reducing part is arranged between the locking mechanism and the nut.
[0005] Preferably, the locking mechanism includes a locking ring, the locking ring includes a ring gasket body, the ring gasket body is a circular ring structure, the axial limiting portion is an axial limiting structure arranged on the inner circumference of the ring gasket body and engaged with the nut, and there is at least one axial limiting structure.
[0006] Preferably, the nut is provided with a ratchet that is meshed with the radial drive portion of the locking mechanism. The ratchet is arranged along the circumference of the nut, and the arrangement direction of the ratchet is parallel to the rotation axis of the nut. When the radial drive portion is pressed against the ratchet, the end of the radial drive portion forms a tight fit with the contact surface of the ratchet.
[0007] Preferably, the limiting fitting portion is a groove or a protruding structure provided on the outer peripheral side of the nut, and the limiting fitting portion is arranged around the circumference of the nut and fits with the axial limiting portion.
[0008] Preferably, the radial driving portion is a pawl arranged at the end of the ring gasket body, the pawl is movably connected to the nut, the pawl is an arc-shaped plate structure arranged along the circumference of the ring gasket body, and the end of the pawl is engaged with the ratchet on the nut.
[0009] Preferably, the locking ring is an integral structure, a plurality of pawls are provided and the plurality of pawls are distributed along the circumference of the ring gasket body, and the axial limiting portion and the radial driving portion are alternately distributed along the circumference of the ring gasket body.
[0010] Preferably, the axial limiting portion is a limiting protrusion provided on the inner peripheral side of the ring gasket body, the limiting protrusion is extended along the radial direction of the ring gasket body, and the limiting protrusion is matched and connected with the outer peripheral side of the nut.
[0011] Preferably, the axial limiting portion is a limiting flange provided on the inner peripheral side of the ring gasket body, the limiting flange is a folded or raised edge structure, and the limiting flange is cooperatively connected with the outer peripheral side of the nut.
[0012] Preferably, the axial limiting portion is a limiting indentation provided on the inner circumference of the ring gasket body, the limiting indentation is cooperatively connected with the outer circumference of the nut, and the limiting indentation is provided on the inner circumferential surface of the radial driving portion close to its center side.
[0013] Preferably, the nut is installed in the nut groove of the drill body, the end of the nut is connected to the inner peripheral side of the locking mechanism, and the outer peripheral side of the nut is connected to the front sleeve through the driving groove to achieve synchronous rotation.
[0014] Preferably, the friction reducing member is a bearing, a first end face of the bearing is connected to the nut, and a second end face of the bearing is connected to the locking mechanism.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] The utility model realizes the locking and loosening operation of the drill bit through the mutual cooperation of the front sleeve, the nut, the drill body and the clamping jaws, and the front sleeve is rotated to drive the nut, the locking mechanism and the friction reducing member to rotate synchronously to realize the closing of the clamping jaws. The axial limiting part of the locking mechanism cooperates with the nut to limit the axial movement of the locking mechanism and the nut, thereby increasing the elastic force of the radial driving part of the locking mechanism, thereby improving the locking performance of the drill chuck; and the anti-loosening effect of the drill chuck is improved by the cooperation between the radial driving part of the locking mechanism and the nut. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0018] Figure 1 This is a schematic diagram of the main structure of the drill chuck embodiment of the utility model;
[0019] Figure 2 For this utility model Figure 1 Cross-sectional view in the AA direction;
[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the nut according to an embodiment of the present utility model;
[0021] Figure 4 This is a schematic diagram of the main structure of the nut according to an embodiment of the utility model;
[0022] Figure 5 This is a schematic diagram of the three-dimensional structure of the first embodiment of the locking ring of the utility model;
[0023] Figure 6 This is a schematic diagram of the main structure of the locking ring embodiment 1 of the present utility model;
[0024] Figure 7 This is a schematic diagram of the three-dimensional structure of the second embodiment of the locking ring of the utility model Figure 1 ;
[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the second embodiment of the locking ring of the utility model Figure 2 ;
[0026] Figure 9 This is a schematic diagram of the three-dimensional structure of the locking ring embodiment of the present invention Figure 1 ;
[0027] Figure 10 This is a schematic diagram of the three-dimensional structure of the locking ring embodiment of the present invention Figure 2 .
[0028] Explanation of symbols in the figure:
[0029] 1. Drill body; 2. Nut; 21. Drive groove; 22. Limit groove; 23. Ratchet; 3. Clamping jaw; 4. Front sleeve; 5. Locking mechanism; 51. Locking ring; 52. Ring washer body; 53. Ratchet; 54. Limiting protrusion; 55. Limiting flange; 56. Limiting indentation; 6. Friction reducing member; 61. Bearing; 7. Rear sleeve; 8. Circlip. DETAILED DESCRIPTION
[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0031] See also Figure 1 、 Figure 2The utility model provides a locking drill chuck, comprising a drill body 1, a nut 2, a clamping jaw 3 and a front sleeve 4. A locking mechanism 5 is provided between the drill body 1 and the front sleeve 4. The locking mechanism 5 is connected to the nut 2. The locking mechanism 5 is sleeved on the outer periphery of the drill body 1. The locking mechanism 5 is provided with an axial limiting portion and a radial driving portion that cooperate with the nut 2. The inner periphery of the nut 2 is threadedly connected to the clamping jaw 3, and the outer periphery of the nut 2 is press-fitted with the axial limiting portion of the locking mechanism 5 through a limiting matching portion. A friction reducing member is provided between the locking mechanism 5 and the nut 2.
[0032] The utility model realizes the locking and loosening operation of the drill bit through the mutual cooperation of the front sleeve 4, the nut 2, the drill body 1 and the clamping jaw 3. The front sleeve 4 is rotated to drive the nut 2, the locking mechanism 5 and the friction reducing member 6 to rotate synchronously to realize the closing of the clamping jaw 3. The axial limiting portion of the locking mechanism 5 cooperates with the nut 2 to limit the axial movement of the locking mechanism 5 and the nut 2, thereby improving the elastic force of the radial driving portion of the locking mechanism 5, thereby improving the locking performance of the drill chuck; and the radial driving portion of the locking mechanism 5 cooperates with the nut, thereby improving the anti-loosening effect of the drill chuck.
[0033] In this embodiment, the nut 2 is mounted on the drill body 1, and the jaws 3 are mounted inside the drill body 1. A threaded transmission mechanism is formed between the nut 2 and the jaws 3 through a thread. The end of the nut 2 is connected to the inner circumference of the locking mechanism 5, and the outer circumference of the nut 2 is connected to the front sleeve 4 through a driving groove 21 to achieve synchronous rotation. Rotating the front sleeve 4 can drive the nut 2 to rotate, and the jaws 3 are driven by the nut 2 to move back and forth through threaded rotation to clamp or release the drill tool.
[0034] Specifically, such as Figure 3 、 Figure 4 As shown, the nut 2 is an annular cam structure with different outer diameters at the top and bottom. The outer diameter of the upper portion of the nut 2 is smaller than that of the lower portion. The inner circumference of the nut 2 is provided with an internal thread, which is threadedly connected to the clamping jaw 3. A drive groove 21 is provided on the outer circumference of the lower end of the nut 2. The cross-sectional shape of the drive groove 21 matches the connection structure on the inner circumference of the front sleeve 4. It can be a square or U-shaped structure to achieve an adaptive connection with the inner circumference of the front sleeve 4. A total of six drive grooves 21 are provided on the end of the nut 2, and the six drive grooves 21 are evenly distributed along the circumference of the nut 2.
[0035] Furthermore, a plurality of driving grooves 21 are evenly distributed along the circumferential direction of the nut 2. The specific shape and number of the driving grooves 21 can be adjusted according to actual needs, and the driving grooves 21 are adapted to the inner circumferential structure of the front sleeve 4 to achieve a stable connection between the nut 2 and the front sleeve 4 and realize synchronous rotation.
[0036] The limiting fitting part is arranged on the upper periphery of the nut 2, and the limiting fitting part is a limiting groove 22 arranged on the periphery of the nut 2. The nut 2 is connected with the axial limiting part of the locking mechanism 5 through the limiting groove 22. The axial limitation of the locking mechanism 5 and the nut 2 is realized through the axial connection between the limiting groove 22 and the axial limiting part, which is convenient for applying pre-tightening force between the locking mechanism 5 and the nut 2.
[0037] In this embodiment, the limiting groove 22 is an annular groove structure arranged around the circumference of the nut 2. The shape of the limiting groove 22 is adapted to the structure of the axial limiting portion on the locking mechanism 5, and the limiting groove 22 is a regular groove structure. The cross-sectional shape of the limiting groove 22 can be set to a rectangular, square or U-shaped structure.
[0038] Furthermore, the nut 2 is provided with a ratchet 23 which is meshed with the radial driving portion of the locking mechanism 5. The ratchet 23 is arranged in the axial lower part of the limiting groove 22. The ratchet 23 is arranged along the circumference of the nut 2. The radial driving portion of the locking mechanism 5 is movably connected to the ratchet 23. When the radial driving portion is pressed against the ratchet 23, the end of the radial driving portion forms a tight fit with the contact surface of the ratchet 23, with a certain amount of compression.
[0039] Specifically, the ratchet teeth 23 are evenly distributed along the circumference of the nut 2, and the arrangement direction of the ratchet teeth 23 is parallel to the rotation axis of the nut 2. The ratchet teeth 23 face the axial direction of the nut 2, so that when the nut 2 rotates, the ratchet teeth 23 and the radial drive part of the locking mechanism 5 are axially engaged or separated; and the angles of the ratchet surfaces on both sides of the ratchet teeth 23 are different, so that when the nut 3 is tightened or loosened, the rotational resistance between the locking mechanism 5 and the nut 2 is different. When tightening, the radial drive part slides along the ratchet surface with a small angle of the ratchet teeth 23, and the torque loss is small, which can make the chuck input a larger torque; when loosening, the radial drive part slides on the ratchet surface with a large angle of the ratchet teeth 23. At this time, it needs to overcome a larger resistance before it can slide, thereby playing a role in preventing loosening.
[0040] In this embodiment, Figure 5 As shown, the locking mechanism 5 includes a locking ring 51, and the locking ring 51 includes a ring gasket body 52. The ring gasket body 52 is a circular ring structure. The axial limiting portion and the radial driving portion are both arranged on the ring gasket body 52. The axial limiting portion is an axial limiting structure arranged on the inner circumference of the ring gasket body 52 and engaged with the nut 2. There is at least one axial limiting structure; the radial driving portion is a pawl 53 arranged at the end of the ring gasket body 52, and the pawl 53 is movably connected to the nut 2.
[0041] Specifically, the locking ring 51 of the present invention has multiple implementations, and the specific structure is as follows.
[0042] Example 1
[0043] like Figure 5 、 Figure 6 As shown, in this embodiment, the axial limiting portion is a limiting protrusion 54 arranged on the inner circumference of the ring gasket body 52. The limiting protrusion 54 is a protrusion or a snap-fit structure extending radially along the ring gasket body 52. The protruding size of the limiting protrusion 54 is adapted to the depth of the limiting groove of the nut 2, and the limiting protrusion 54 can abut against the upper end surface of the limiting groove 22 of the nut 2, thereby limiting the axial movement of the two during rotation.
[0044] Specifically, in this embodiment, the pawl 53 of the radial driving part is arranged at the lower end of the ring gasket body 52, and at least one pawl 53 is provided, and the pawl 53 is an arc-shaped plate structure arranged along the circumference of the ring gasket body 52, and the arc of the pawl 53 is the same as the circumferential arc of the ring gasket body 52; one end of the pawl 53 is connected to the ring gasket body 52, and the other end of the pawl 53 is a tooth-like structure protruding radially downward along the ring gasket body 52. When the locking ring 51 is pressed against the nut 2, there is a certain amount of compression between the pawl 53 of the locking ring 51 and the ratchet teeth 23 of the nut 2, and the end of the pawl 53 forms a tight fit with the contact surface of the ratchet teeth 23, and the end of the pawl 53 is engaged with the ratchet teeth 23 of the nut 2 to form an axially limited locking structure.
[0045] Furthermore, in this embodiment, three limiting protrusions 54 are evenly distributed in the circumferential direction on the ring gasket body 52, and three pawls 53 are also evenly distributed along the circumference of the ring gasket body 52, and the three limiting protrusions 54 and the three pawls 53 are alternately distributed in the circumferential direction of the ring gasket body 52.
[0046] Example 2
[0047] like Figure 7 、 Figure 8 As shown, in this embodiment, the axial limiting portion is a limiting flange 55 arranged on the inner circumference of the ring gasket body 52. The size of the limiting flange 55 is adapted to the size of the nut limiting groove 22, and the limiting flange 55 is clamped in the limiting groove 22 of the nut 2, thereby limiting the axial movement of the two during rotation.
[0048] Specifically, in this embodiment, the pawl 53 of the radial driving part is arranged at the lower end of the ring gasket body 52, and at least one pawl 53 is provided, and the pawl 53 is an arc-shaped plate structure arranged along the circumference of the ring gasket body 52, and the arc of the pawl 53 is the same as the circumferential arc of the ring gasket body 52; one end of the pawl 53 is connected to the ring gasket body 52, and the other end of the pawl 53 is a tooth-like structure protruding radially downward along the ring gasket body 52. When the locking ring 51 is pressed against the nut 2, there is a certain amount of compression between the pawl 53 of the locking ring 51 and the ratchet teeth 23 of the nut 2, and the end of the pawl 53 forms a tight fit with the contact surface of the ratchet teeth 23, and the end of the pawl 53 is engaged with the ratchet teeth 23 of the nut 2 to form an axially limited locking structure.
[0049] Furthermore, in this embodiment, three limiting flanges 55 are evenly distributed in the circumferential direction on the ring gasket body 52, and three pawls 53 are also evenly distributed along the circumference of the ring gasket body 52, and the three limiting flanges 55 and the three pawls 53 are alternately distributed in the circumferential direction of the ring gasket body 52.
[0050] Furthermore, the limiting flange 55 can be a folded or raised edge structure arranged radially inward along the ring gasket body 52. The limiting flange 55 is connected with the limiting groove 22 of the nut 2 to achieve axial locking and limiting.
[0051] Example 3
[0052] like Figure 9 、 Figure 10 As shown, in this embodiment, the axial limiting portion is a limiting indentation 56 arranged on the inner circumferential side of the ring gasket body 52, and the limiting indentation 56 is a long protrusion structure that convexes radially inward along the ring gasket body 52. The limiting indentation 56 is a square protrusion structure with an arc arranged circumferentially along the ring gasket body 52. The size of the limiting indentation 56 is compatible with the size of the nut limiting groove 22, and the limiting indentation 56 can be snapped into the limiting groove 22 of the nut 2, so that the axial movement of the two can be limited during rotation.
[0053] Specifically, in this embodiment, the pawl 53 of the radial driving part is arranged at the lower end of the ring gasket body 52, and at least one pawl 53 is provided, and the pawl 53 is an arc-shaped plate structure arranged along the circumference of the ring gasket body 52, and the arc of the pawl 53 is the same as the circumferential arc of the ring gasket body 52; one end of the pawl 53 is connected to the ring gasket body 52, and the other end of the pawl 53 is a tooth-like structure protruding radially downward along the ring gasket body 52. When the locking ring 51 is pressed against the nut 2, there is a certain amount of compression between the pawl 53 of the locking ring 51 and the ratchet teeth 23 of the nut 2, and the end of the pawl 53 forms a tight fit with the contact surface of the ratchet teeth 23, and the end of the pawl 53 is engaged with the ratchet teeth 23 of the nut 2 to form an axially limited locking structure.
[0054] Furthermore, in this embodiment, the limiting indentation 56 is set on the inner peripheral side of the pawl 53, and the number of the limiting indentations 56 matches the number of the pawls 53. The limiting indentation 56 is stably engaged with the limiting groove 22 of the nut 2 to achieve axial limitation.
[0055] Furthermore, in this embodiment, three limiting indentations 56 are evenly distributed in the circumferential direction on the ring gasket body 52, and three pawls 53 are also evenly distributed along the circumference of the ring gasket body 52. The limiting indentations 56 are arranged on the inner circumferential side of the ring gasket body 52, and the limiting indentations 56 are arranged on the inner circumferential surface of the pawl 53 close to its center side.
[0056] Furthermore, as a preferred embodiment of the present invention, Figure 5-10 As shown, the locking ring 51 is an integrated structure. By pressing the limiting protrusion, flange or indentation on the locking ring 51 against the limiting groove 22 of the nut 2, the axial movement thereof is limited by the connection between the two, and the pawl 53 on the locking ring 51 is connected to the ratchet 23 on the nut 2 to generate a pre-tightening force. The integrated structure of the locking ring 51 can further increase the elastic performance of the pawl 53 and improve the locking performance of the drill chuck.
[0057] Furthermore, as a preferred embodiment of the present invention, the locking ring 51 is provided with multiple protrusions, flanges or indentations serving as axial limiting parts and radial driving parts and pawls 53, and the number of settings can be adjusted as needed, and the specific setting shape and the setting position relationship between the axial limiting part and the radial driving part can also be adapted and adjusted according to the structure and setting form of the upper limit groove 22 and the ratchet 23 on the nut 2.
[0058] Furthermore, as a preferred embodiment of the present invention, the limiting fitting portion provided on the nut 2 can also be a limiting protrusion structure, the limiting protrusion is provided on the outer periphery of the nut 2 and is arranged in a ring around the nut 2 in the circumferential direction to fit with the axial limiting portion, the axial limiting portion is an annular groove structure adapted to the limiting protrusion, and the annular groove structure is provided on the inner circumference of the locking ring 51.
[0059] In this embodiment, the friction-reducing member 6 arranged between the nut 2 and the locking ring 51 is a bearing 61. The bearing 61 plays a friction-reducing role. In the axial direction, the lower end face of the bearing 61 is connected to the nut 2, and the upper end face of the bearing 61 is connected to the locking ring 51; in the radial direction, the outer periphery of the bearing 61 is connected to the inner peripheral side of the locking ring 51, and the inner periphery of the bearing 61 is arranged against the drill body 1, realizing the axial connection of the nut 2, the bearing 61, and the locking ring 51 in the axial direction.
[0060] Furthermore, Figure 2As shown, the drill chuck of the present invention further comprises a rear sleeve 7, and a retaining spring 8 is provided between the front sleeve 4 and the drill body 1, which ensures the stability and durability of the drill chuck connection and prevents the drill body from loosening due to impact.
[0061] Working principle of this utility model:
[0062] When the drill chuck is in use, the drill chuck is initially in a free state. The front sleeve 4 is manually rotated, and the front sleeve 4 drives the nut 2 to rotate. The rotation of the nut 2 realizes the forward and backward movement of the clamping jaws 3 to achieve clamping or loosening of the tool. Since the protrusion, flange or indentation of the axial limiting portion of the locking ring 51 will be stuck in the limiting groove 22 of the nut 2, the axial connection between the nut 2, the bearing 61 and the locking ring 51 is achieved, and the pawl 53 on the locking ring 51 is engaged with the ratchet 23 on the nut 2 to generate the necessary preload force, so that when the nut 2 rotates, it drives the locking ring 51 and the bearing 61 to rotate together. As the closing force of the jaws 3 gradually increases, when the closing force of the jaws 3 reaches a certain level, the friction between the locking ring 51 and the drill body 1 is large enough, and the locking ring 51 stops rotating. Under the friction-reducing effect of the bearing 61, the nut 2 can continue to rotate. During this process, the pawl 53 on the locking ring 51 will slide on the ratchet teeth 23 of the nut 2 and make a "clicking" locking sound, indicating that the drill chuck is in the locking process.
[0063] When the front sleeve 4 is rotated to loosen the clamping jaw 3, due to the connection between the ratchet 23 of the nut 2 and the pawl 53 of the locking ring 51, the angles of the ratchet surfaces on both sides of the ratchet 23 are different. When the drill chuck is tightened, the pawl 53 slides along the ratchet surface with a smaller angle, which can reduce torque loss and allow a larger torque to be input; and when the drill chuck needs to be loosened, the pawl 53 slides along the ratchet surface with a larger angle. At this time, the drill chuck needs to overcome the greater friction generated between the locking ring 51 and the drill body 1, and thus needs to overcome a larger resistance before the drill chuck can be loosened, thereby realizing the anti-loosening function of the drill chuck.
[0064] When the drill chuck is loosened, the pawl 53 on the locking ring 51 must slide across multiple ratchet teeth 23, creating an axial fluctuation. This fluctuation generates an axial force that pushes the nut 2 forward, driving the jaws 3 forward, thereby tightening the grip on the tool. The pawl 53 has a strong elastic structure and reliable anti-loosening performance, further enhancing the stability and safety of the drill chuck and preventing accidental loosening and jaw loss during use.
[0065] The utility model works reliably and has stable locking performance. The locking and loosening operations of the drill bit are realized by the mutual cooperation of the front sleeve 4, the nut 2, the drill body 1 and the clamping jaw 3. The front sleeve 4 is driven to drive the nut 2, the locking ring 51 and the bearing 61 to rotate synchronously to realize the closing of the clamping jaw 3. The axial limiting portion of the locking ring 51 cooperates with the nut 2 to limit the axial movement of the locking ring 51 and the nut 2, thereby improving the elastic force of the pawl 53 on the locking ring 51, thereby improving the locking performance of the drill chuck; and the cooperation of the pawl 53 on the locking ring 51 and the nut 2 improves the anti-loosening effect of the drill chuck.
[0066] The present invention limits axial displacement of the locking ring 51 and the nut 2 by means of a pressing connection between the two, thereby strengthening the elastic force of the pawl 53 on the locking ring 51 and improving locking performance. Furthermore, the present invention eliminates the need for separate components for positioning or preventing loosening, reducing the number of parts in the drill chuck and thus reducing the size of the drill chuck. The simplified structure not only reduces production costs but also meets customer demand for small-diameter locking drill chucks.
[0067] In the description of the present invention, it should be understood that terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 understood as a limitation on the present application.
[0068] In addition, in the description of the present application, “a plurality of” means two or more, unless otherwise clearly and specifically defined.
[0069] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A locking drill chuck comprising a drill body, a nut, a clamping jaw, and a front sleeve, wherein a locking mechanism is provided between the drill body and the front sleeve, and the locking mechanism is connected to the nut, characterized in that: The locking mechanism is sleeved on the periphery of the drill body, and the locking mechanism is provided with an axial limiting portion and a radial driving portion that cooperate with the nut. The inner peripheral side of the nut is threadedly connected to the clamping claw, and the outer peripheral side of the nut is press-fitted with the axial limiting portion of the locking mechanism through a limiting matching portion. A friction reducing part is provided between the locking mechanism and the nut.
2. A locking drill chuck according to claim 1, characterized in that: The locking mechanism includes a locking ring, which includes a ring gasket body. The ring gasket body is a circular ring structure. The axial limiting portion is an axial limiting structure arranged on the inner circumference of the ring gasket body and engaged with the nut. There is at least one axial limiting structure.
3. A locking drill chuck according to claim 1, characterized in that: The nut is provided with a ratchet that is meshed with the radial driving part of the locking mechanism. The ratchet is arranged along the circumference of the nut, and the arrangement direction of the ratchet is parallel to the rotation axis of the nut. When the radial driving part is pressed against the ratchet, the end of the radial driving part forms a tight fit with the contact surface of the ratchet.
4. A locking drill chuck according to claim 1, characterized in that: The position-limiting fitting portion is a groove or a protruding structure arranged on the outer peripheral side of the nut. The position-limiting fitting portion is arranged in a ring around the nut in the circumferential direction and fits with the axial position-limiting portion.
5. A locking drill chuck according to claim 2, characterized in that: The radial driving part is a pawl arranged at the end of the ring gasket body, the pawl is movably connected to the nut, the pawl is an arc-shaped plate structure arranged along the circumference of the ring gasket body, and the end of the pawl is engaged with the ratchet on the nut.
6. A locking drill chuck according to claim 2, characterized in that: The axial limiting portion is a limiting protrusion provided on the inner peripheral side of the ring gasket body. The limiting protrusion is extended along the radial direction of the ring gasket body, and the limiting protrusion is matched and connected with the outer peripheral side of the nut.
7. The locking drill chuck according to claim 2, characterized in that: The axial limiting portion is a limiting flange arranged on the inner peripheral side of the ring gasket body. The limiting flange is a folded or raised edge structure. The limiting flange is cooperatively connected with the outer peripheral side of the nut.
8. The locking drill chuck according to claim 2, characterized in that: The axial limiting portion is a limiting indentation arranged on the inner circumference of the ring gasket body, the limiting indentation is matched with the outer circumference of the nut, and the limiting indentation is arranged on the inner circumferential surface of the radial driving portion close to its center side.
9. The locking drill chuck according to claim 5, characterized in that: The locking ring is an integral structure, a plurality of pawls are provided and the plurality of pawls are distributed along the circumference of the ring gasket body, and the axial limiting portion and the radial driving portion are alternately distributed along the circumference of the ring gasket body.
10. The locking drill chuck according to claim 1, characterized in that: The friction reducing member is a bearing, a first end surface of the bearing is connected to the nut, and a second end surface of the bearing is connected to the locking mechanism.