Self-locking type hand-tight drill chuck

Abstract

The utility model provides a self-locking type hand-tight drill chuck which comprises a drill body, a clamping jaw, a nut and a rotating sleeve, the nut is in threaded connection with the clamping jaw, the rotating sleeve is connected with the nut through a connecting structure, the drill chuck is provided with a self-locking structure, the self-locking structure comprises an elastic piece and teeth, the elastic piece and the nut rotate together, and the teeth are fixed relative to the drill body. The elastic sheet is also connected with the rotary sleeve; an axial rear limiting structure is arranged on the inner wall of the rotating sleeve and can drive the elastic piece to move forwards, so that the situation that connection between the elastic piece and the rotating sleeve is affected by axial relative movement is prevented. When the whole structure or the local structure of the rotary sleeve moves forwards, the elastic piece is correspondingly driven to move forwards, connection between the rotary sleeve and the elastic piece is kept, and the risk of self-locking failure caused by axial relative displacement of the rotary sleeve and the elastic piece is prevented.

Description

Technical Field

[0001] The utility model relates to a self-locking hand-tight drill chuck. Background Art

[0002] A drill body, clamping jaws, a nut, and a rotating sleeve are provided in a hand-tight drill chuck. The nut is in threaded connection with the clamping jaws. 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 jaws to move forward or backward, so that the clamping jaws clamp or release the drill bit. A self-locking hand-tight drill chuck is a hand-tight drill chuck with a self-locking mechanism added, which has a self-locking function. The self-locking mechanism includes a spring piece. The spring piece is arranged to be connected with the nut to rotate together and is also connected with the rotating sleeve. From the non-clamping state to the clamping state of the drill chuck, the rotating sleeve drives the nut to rotate through the spring piece. When rotating from the clamping state to the self-locking state and when loosening from the clamping state, the rotating sleeve drives the nut to rotate through keyway cooperation. The spring piece is provided with a locking end, and the locking end cooperates with a tooth ring provided on the drill body through a control cooperation part provided on the spring piece to prevent the nut from rotating in the reverse direction. Since the shape of the rotating sleeve is generally similar to a horn, and the inner wall of the front part is thick while the inner wall of the part cooperating with the control cooperation part is thin. When the rotating sleeve rotates to the maximum extrusion position of the control cooperation part by the control structure, under the action of the rebound force, there will be a tendency for the rear part of the rotating sleeve to deform and open, causing the rotating sleeve to be extruded and moved forward. There is a risk that the cooperation between the rotating sleeve and the spring piece will be disengaged front and back and cannot be automatically restored, resulting in the failure of the self-locking function. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a self-locking hand-tight drill chuck, which can avoid the risk of self-locking failure caused by the forward movement of the rotating sleeve during work. For this purpose, the utility model adopts the following technical solutions:

[0004] The self-locking hand-tight drill chuck includes a drill body, clamping jaws, a nut, and a rotating sleeve. The nut is in threaded connection with the clamping jaws. The rotating sleeve is connected to the nut through a connecting structure. The drill chuck is provided with a self-locking structure. The self-locking structure includes a spring piece that rotates together with the nut and teeth fixed relative to the drill body. The spring piece is also connected to the rotating sleeve. It is characterized in that an axially rearward limiting structure is arranged on the inner wall of the rotating sleeve. The rearward limiting structure can prevent the axial relative movement from affecting the connection between the spring piece and the rotating sleeve by driving the spring piece to move forward.

[0005] On the basis of adopting the above technical solutions, the utility model can also adopt the following further technical solutions, or use these further technical solutions in combination:

[0006] The rearward limiting structure cooperates with the spring piece, or with a structure arranged on the spring piece, or performs a limiting cooperation with a component provided with the spring piece.

[0007] The shrapnel has a protrusion towards the outside, and the rear limit structure cooperates with the protrusion.

[0008] The self-locking structure includes a control part arranged on the inner wall of the rotating sleeve, and a locking end and a control cooperation part on the shrapnel in the self-locking structure; a groove that cooperates with the protrusion when the rotating sleeve rotates to the self-locking state or the unlocking state of the drill chuck is arranged on the inner wall of the rotating sleeve, and behind the groove, at the position corresponding to the protrusion when it is located in the groove, the rear limit structure is arranged.

[0009] The protrusion is a protrusion for circumferentially positioning or limiting the rotating sleeve.

[0010] Beside the part of the rear of the groove blocked by the rear limit structure, there is also an opening towards the rear for the protrusion to slide into the groove during installation.

[0011] The rotating sleeve includes a lining sleeve, and the lining sleeve is provided with a structure connected to the shrapnel and the rear limit structure.

[0012] The shrapnel is arranged on a ring-shaped locking piece, the locking piece is sleeved outside the drill body, located in front of or behind the nut, and is axially limited, and the locking piece is synchronous with the nut in the circumferential direction.

[0013] The locking piece is provided with a locking end in the self-locking structure and a control cooperation part that cooperates with the control part arranged on the inner wall of the rotating sleeve; the drill chuck is also provided with a toothed ring sleeved on the drill body, the toothed ring is fixed to the drill body and cannot rotate relatively, the teeth are internal teeth arranged on the toothed ring, and the internal teeth are outside the periphery of the locking end. When the control part arranged on the inner wall of the rotating sleeve presses the control cooperation part, the tooth end in the self-locking structure leaves the tooth and is in the unlocking state. When the control part on the rotating sleeve rotates away from the control cooperation part or weakens the pressure on the control cooperation part, the tooth end inserts into the tooth and is in the self-locking state.

[0014] The self-locking type hand-tight drill chuck is a normally closed self-locking type hand-tight drill chuck, that is, when the control part arranged on the inner wall of the rotating sleeve presses the control cooperation part of the self-locking structure, the tooth end in the self-locking structure leaves the tooth and is in the unlocking state. When the control part arranged on the inner wall of the rotating sleeve leaves the control cooperation part or weakens the pressure on the control cooperation part, the tooth end in the self-locking structure inserts into the tooth and is in the self-locking state.

[0015] Due to adopting the technical solution of the present invention, when the overall structure or partial structure of the rotating sleeve moves forward, the shrapnel will also be correspondingly driven to move forward, so as to maintain the connection between the rotating sleeve and the shrapnel, and prevent the risk of self-locking failure caused by the axial relative displacement between the rotating sleeve and the shrapnel. Description of the Drawings

[0016] Figure 1 It is an exploded view of the structure of an embodiment of the present utility model.

[0017] Figure 2 It is a sectional view of an embodiment of the present utility model.

[0018] Figure 3 It is a schematic structural view of the bushing in the rotating sleeve in an embodiment of the present utility model.

[0019] Figure 4 is Figure 3 a sectional view of the shown bushing.

[0020] Figure 5 It is a schematic view of the lock ring in an embodiment of the present utility model.

[0021] Figure 6 It is an indication diagram of an embodiment of the present utility model.

[0022] Figure 7 In the self-locking state, Figure 6 sectional view A-A of

[0023] Figure 8 In the unlocked state, Figure 6 sectional view A-A of Detailed Description of the Invention

[0024] The self-locking hand-tight drill chuck provided by the present utility model includes a drill body 1, a chuck jaw 4, a nut 3, and a rotating sleeve 2. The nut 3 is sleeved outside the drill body 1, and the rotating sleeve 2 is sleeved outside the drill body 1 and the nut 3. The nut 3 is threadedly connected to the chuck jaw 4, and the rotating sleeve 2 is connected to the nut 3 through a connection structure. The drill chuck is provided with a self-locking structure, and the self-locking structure includes a spring piece 51 that rotates together with the nut and a tooth 11 that is fixed relative to the drill body. The spring piece 51 is also connected to the rotating sleeve 2; an axial rear limiting structure is provided on the inner wall of the rotating sleeve 2, and the rear limiting structure can prevent the axial relative movement from affecting the connection between the spring piece 51 and the rotating sleeve 2 by driving the spring piece 51 to move forward.

[0025] In this embodiment, the rotating sleeve 2 includes a lining sleeve 21 and a metal shell 22, which are connected together.

[0026] In this embodiment, the drill chuck is further provided with a toothed ring 53, and the toothed ring 53 and the drill body can be fixed by interference fit, keyway fit, etc. and cannot rotate relative to each other.

[0027] In this embodiment, the elastic piece 51 is arranged on the ring-shaped locking member 5. The locking member 5 is synchronized with the nut 3 in the circumferential direction through keyway fitting. The locking member 5 includes a base ring 52. The base ring 52 is axially restricted between the nut 3 and a ring of bearing steel balls 50. The ring of steel balls 50 is included between the base ring 52 and a gear ring 53, and the gear ring 53 is located on a step 12 in the middle of the drill body 1. The nut 3 is placed on the base ring 52 through an annular arc surface 31 at the rear thereof that matches the base ring 52. The front part of the nut 3 is in axial limit fit with a step at the front part of the bushing 21, and the front part of the bushing 21 is limited by a front end cap 6 fixedly connected to the drill body 1.

[0028] The elastic piece 51 has a protrusion 511 facing outward, and the rear limit structure cooperates with the protrusion 511. The protrusion 511 is a protrusion for circumferentially positioning or limiting the rotating sleeve 2. The inner wall of the bushing 21 is provided with a groove 211 that cooperates with the protrusion 511 when the rotating sleeve 2 rotates to the self-locking state and a groove 212 corresponding to the unlocking state.

[0029] A key 54 is arranged on the locking member 5, and the key 54 and a groove 32 on the nut 3 are used for the keyway fitting to be synchronized in the circumferential direction. The elastic piece 51 can be divided into two sections, which are respectively located on both sides of the key 54. One side is provided with the protrusion 511, and the other side is provided with a locking end 512 that cooperates with the tooth 11 and a control cooperation part, i.e., a protrusion 513, that cooperates with a control part, i.e., a cam structure 213, on the rotating sleeve 2 (bushing 21).

[0030] The self-locking type hand-tight drill chuck in this embodiment adopts a normally closed self-locking type hand-tight drill chuck. That is, when a control part, i.e., a cam structure 213, arranged on the inner wall of the rotating sleeve presses a control cooperation part, i.e., a protrusion 513, of the self-locking structure, the tooth end 512 in the self-locking structure leaves the tooth 11 and is in the unlocking state. When the control part, i.e., the cam structure 213, arranged on the inner wall of the rotating sleeve leaves the control cooperation part, i.e., the protrusion 513, or weakens the pressure on the control cooperation part, i.e., the protrusion 513, the tooth end 512 in the self-locking structure inserts into the tooth 11 and is in the self-locking state.

[0031] The tooth 11 is an internal tooth arranged on the gear ring 53 and can be arranged on the inner wall 521 of the lock ring 53. The inner wall 531 extends forward to the periphery of the locking end 512.

[0032] Preferably, the position of the protrusion 511 when the bushing 21 is correspondingly located in the groove 212, i.e., the position of the protrusion 511 in the unlocked state, is where the rear limit structure is provided behind the groove 211. The rear limit structure 7 can be a block integrally formed with the bushing 21 or connected through a connection structure. When the rotating sleeve 2 moves forward due to the action of the protrusion 513, the rear limit structure 7 can also correspondingly drive the elastic piece 51 (and the locking member 5) to move forward. Further, beside the part of the rear of the groove 212 blocked by the rear limit structure 7, there is an opening 214 towards the rear for the protrusion 511 to slide into the groove 212 during installation.

[0033] One advantage of using the rear limit structure 7 to cooperate with the protrusion 51 is that it does not increase the functional structure of the elastic piece 51. In order to form the rear limit structure 7, only the rear part of the originally grooved part inside the rotating sleeve 2 (bushing 21) does not need to be fully open, and the non-open part constitutes the rear limit structure, thus facilitating manufacturing and assembly, and the structure is also simple.

[0034] The use of the structure of a normally closed self-locking hand-tight drill chuck can contribute to the installation of the above structure.

[0035] In addition, protruding parts can also be provided at other parts of the key 54 or the locking member 5 to perform the above-mentioned limiting cooperation with the rear limit structure 7 on the rotating sleeve 2. The structure on the bushing 21 can also be a separate component and be incorporated during the manufacturing of the set. The rotating sleeve 2 can also be a single integral sleeve.

[0036] The above are only specific embodiments of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the protection scope of the present invention.

[0037] It should be noted that the terms "including" and "having" in the description, claims and above-mentioned drawings of the present invention, as well as any variations thereof, are intended to cover non-exclusive inclusion. The terms "installed", "set", "provided with", "connected", "connected together", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can 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 invention can be understood according to specific circumstances.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "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. It 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. Therefore, it should not be construed as a limitation to the present utility model. The terms "first" and "second" are also only used for simplicity in description and do not indicate or imply relative importance.

Claims

1. A self-locking hand-tightened drill chuck, comprising a drill body, a clamping jaw, a nut, and a rotating sleeve, wherein the nut and the clamping jaw are threadedly connected, and the rotating sleeve is connected to the nut through a connecting structure, and the drill chuck is provided with a self-locking structure, wherein the self-locking structure comprises a spring piece connected to the nut for rotation and a tooth fixed relative to the drill body, and the spring piece is also connected to the rotating sleeve; characterized in that An axial rear limit structure is arranged on the inner wall of the rotating sleeve, and the rear limit structure can prevent the axial relative movement from affecting the connection between the elastic sheet and the rotating sleeve by driving the elastic sheet to move forward.

2. The self-locking hand-tight drill chuck according to claim 1, characterized in that The rear limiting structure cooperates with the spring sheet or with a structure arranged on the spring sheet or with a component on which the spring sheet is arranged to perform limiting cooperation.

3. The self-locking hand-tight drill chuck according to claim 1, characterized in that The spring sheet has a protrusion facing outward, and the rear limiting structure cooperates with the protrusion.

4. The self-locking hand-tight drill chuck according to claim 3, characterized in that The self-locking structure includes a control portion arranged on the inner wall of the rotating sleeve, and a locking end and a control matching portion on the spring sheet in the self-locking structure; the inner wall of the rotating sleeve is provided with a groove that matches with the protrusion when the rotating sleeve is rotated to the self-locking state or the unlocking state of the drill chuck, and the rear limiting structure is provided behind the groove at the position corresponding to the protrusion when it is located in the groove.

5. The self-locking hand-tight drill chuck according to claim 3, characterized in that The protrusion is a protrusion for circumferentially positioning or limiting the rotating sleeve.

6. The self-locking hand-tight drill chuck according to claim 4, characterized in that The rear portion of the groove is provided with an opening toward the rear beside the portion blocked by the rear limiting structure, so as to allow the protrusion to slide into the groove during installation.

7. The self-locking hand-tight drill chuck according to claim 1, characterized in that The rotating sleeve comprises an inner sleeve, and the inner sleeve is provided with a structure connected with the spring sheet and the rear limiting structure.

8. The self-locking hand-tight drill chuck according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that The spring piece is arranged on a ring-shaped locking piece, the locking piece is sleeved outside the drill body, located at the front or rear of the nut, and is axially limited, and the locking piece is synchronized with the nut in the circumferential direction.

9. The self-locking hand-tight drill chuck according to claim 8, characterized in that The locking element is provided with a locking end in a self-locking structure and a control matching portion that matches with a control portion provided on the inner wall of the rotating sleeve, and the control matching portion and the locking end are provided on a spring piece in the locking element; The drill chuck is also provided with a gear ring sleeved on the drill body, the gear ring is fixed to the drill body and cannot rotate relatively, the teeth are internal teeth arranged on the gear ring, and the internal teeth are located at the periphery of the locking end, when the control part arranged on the inner wall of the rotating sleeve presses the control matching part, the tooth end in the self-locking structure leaves the teeth and is in an unlocked state, and when the control part of the rotating sleeve leaves the control matching part or reduces the pressure on the control matching part, the tooth end is inserted into the teeth and is in a self-locking state.

10. The self-locking hand-tight drill chuck according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that The self-locking hand-tight drill chuck is a normally closed self-locking hand-tight drill chuck, that is, when the control portion provided on the inner wall of the rotating sleeve compresses the control matching portion of the self-locking structure, the tooth end in the self-locking structure leaves the tooth and is in an unlocked state; when the control portion provided on the inner wall of the rotating sleeve leaves the control matching portion or weakens the pressure on the control matching portion, the tooth end in the self-locking structure inserts into the tooth and is in a self-locking state.

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