CN219888471U - Locking structure with self-locking internal thread - Google Patents

Abstract

The utility model relates to a locking structure with self-locking internal threads, which comprises a body, wherein an internal thread hole and at least one containing groove are axially arranged, the internal thread hole is provided with an internal thread bottom diameter and an internal thread inner diameter along a radial direction, a contact area is formed between the internal thread bottom diameter and the internal thread inner diameter in a surrounding way, the containing groove is intersected with the contact area and communicated with the internal thread hole, and the groove wall of the containing groove is separated from the internal thread inner diameter along the radial direction by a distance; the fixing screw piece stretches into the containing groove and is fixed on the body, threads of the fixing screw piece are intersected with the contact area, and the hardness of the material of the fixing screw piece is lower than that of a bolt and the body. Therefore, the bolt is screwed into the inner thread hole to be combined with the body, and an outer thread peak of the bolt contacts and presses the threads of the fixed screw through the contact area, so that the threads of the fixed screw are deformed to generate a biting force between the bolt and the fixed screw along the radial direction.

Description

Locking structure with self-locking internal thread

Technical Field

The utility model relates to a locking structure, in particular to a locking structure with self-locking internal threads, wherein the edge of an internal thread hole is provided with a fixed screw, when a body is combined with a bolt, the threads of the fixed screw are deformed to generate a biting force between the bolt and the fixed screw along the radial direction, and the thread peak of the internal thread hole is still complete and continuous threads.

Background

While the bolt-and-nut assembly is effective in bonding or securing two workpieces, the bolt-and-nut assembly can be undesirably loosened when the bolt-and-nut assembly is subjected to prolonged vibration or high load, such as in a vehicle or machining equipment with severe vibration, and may have irreparable consequences once loosened.

There is a nut which is not easily loosened by Japanese patent publication No. JPA-2022122222A, in which a notch is formed in the nut after the nut is coupled to the screw, and a self-tapping screw is inserted into the notch, thereby preventing the nut from being loosened. Although the above mentioned prior art can effectively prevent the nut from rotating relative to the screw, when the nut is to be disassembled, the self-tapping screw needs to be disassembled first, which is inconvenient in use. Furthermore, the screw body may be damaged during the processing of the notch, which is slightly impractical.

So, there is a nut with a screw hole for preventing the nut from loosening in China patent publication No. CN 203856854U; at least one containing groove axially arranged on the hole wall of the screw hole along the screw hole of the screw cap; at least one clamping piece is arranged in the containing groove of the nut. According to the utility model, at least one clamping piece is arranged in the accommodating groove of the nut along the axial direction of the nut, and when the nut is in threaded connection with the screw/bolt, the clamping piece elastically clamps the screw/bolt, so that an elastic tightening effect is formed between the nut and the screw, and the nut is prevented from loosening.

The screw can be screwed in or out according to the requirement, so that the screw is convenient to assemble and disassemble, but the containing groove is arranged on the wall of the screw hole and is completely communicated with the screw hole, namely, the screw hole is provided with a part which is not provided with screw threads, so that the screw teeth are in a discontinuous state.

Furthermore, when the clamping piece is arranged in the containing groove, the clamping piece protrudes out of the containing groove, the screw/bolt is ready to be screwed into the nut, the screw/bolt needs to push the clamping piece to the outer side of the containing groove and simultaneously screw into the nut, and the situation that the clamping piece is unsmooth to install and can not be engaged easily occurs in use.

Disclosure of Invention

Therefore, in order to make the nut itself still have a complete thread and make the clamping member (i.e. the fixing screw member in the present case) installed in the accommodating groove not protrude from the inner diameter of the inner screw thread, when the screw and the nut body are disassembled or installed, the situation that the screw thread is not smooth and the assembly or disassembly is difficult is not caused, and a locking structure with a self-locking inner thread is proposed, and the locking structure with a self-locking inner thread is used together with a bolt, and comprises:

the body is axially provided with an inner screw hole and at least one containing groove, the inner screw hole is radially provided with an inner screw bottom diameter and an inner screw inner diameter, a contact area is formed between the inner screw bottom diameter and the inner screw inner diameter in a surrounding mode, the containing groove is intersected with the contact area and communicated with the inner screw hole, and the groove wall of the containing groove is radially separated from the inner screw inner diameter by a distance; the fixing screw piece stretches into the containing groove and is fixed on the body, threads of the fixing screw piece are intersected with the contact area, and the hardness of the material of the fixing screw piece is lower than that of the material of the bolt and the body; the screw bolt is screwed into the inner screw thread hole to be combined with the body, and the outer screw thread crest of the screw bolt contacts and presses the screw thread of the fixed screw through the contact area, so that the screw thread of the fixed screw is deformed to generate a biting force between the screw bolt and the fixed screw in the radial direction.

Further, the accommodating groove is a round hole, the outer diameter of the fixing screw piece is larger than the aperture of the round hole, and the fixing screw piece stretches into and is tightly matched with the round hole.

Further, the threads of the fixing screw member contact the inner wall of the circular hole to be extruded and deformed, so that a friction force is generated between the fixing screw member and the inner wall of the circular hole.

Further, there are a plurality of holding grooves and a plurality of fixing screws, each fixing screw stretches into each holding groove respectively, each holding groove surrounds this interior screw tooth hole setting, and adjacent arbitrary two holding grooves regard this interior screw tooth hole as the center to press from both sides an contained angle mutually.

Further, there are six pockets and six fixing screws, the included angle being sixty degrees.

Further, a half of the receiving groove radially intersects the contact area, and the outer thread crest of the bolt passes through the contact area so that the outer thread crest contacts and presses the thread of the fixing screw in a half of the radial direction.

Further, the body is a nut.

Further, the fixing screw is one of a screw and a screw.

The following effects can be achieved according to the technical characteristics:

1. the thread peak of the inner thread hole is still a complete and continuous thread, the bolt is easy to install and disassemble when rotating relative to the body, and the occurrence of slipping or unsmooth assembly can be reduced.

2. The edge of the fixed screw piece arranged in the containing groove can not protrude out of the thread crest of the inner thread hole, when the bolt is rotationally combined with the body, the tooth root of the bolt can not contact with the fixed screw piece, and only the thread crest of the bolt can contact with the fixed screw piece, so that the situation of unsmooth assembly can be avoided.

3. When the biting force is insufficient or lost, the position of the locking screw piece can be changed along the axial direction, or the deformed fixing screw piece can be directly replaced, and the original body is reserved, so that the body can be reused.

Drawings

Fig. 1 is a perspective view of the present utility model.

Fig. 2 is an exploded view of the present utility model.

Fig. 3 is a top view of the body of the present utility model.

Fig. 4 is a perspective cross-sectional view of the body of the present utility model.

Fig. 5 is a perspective cross-sectional view of the present utility model.

Fig. 6 is a cross-sectional view of the present utility model engaged with a bolt.

Fig. 7 is an enlarged view of a portion at vii of fig. 6.

FIG. 8 is a schematic view of the present utility model in use with the fixture screw placed in another position in the body.

FIG. 9 is a schematic view showing the placement of the fixing screw in another position of the body according to the present utility model.

Fig. 10 is a cross-sectional view of another embodiment of the present utility model.

FIG. 11 is a cross-sectional view of another embodiment of the present utility model with the fixture screw positioned in another location on the body.

Reference numerals illustrate:

1, body 11, inner screw tooth hole 111, inner screw tooth root diameter

112 inner diameter 113 contact area 114 inner thread peak

12 containing groove

2 fixing screw 21, deformation part

3 bolt 31, outer thread crest

4 gap

Width W1-distance

D1 axial direction D2 radial direction

1A, a processed workpiece 11A, an inner screw thread hole 12A and a container groove

2A, fixing screw 3A and bolt.

Detailed Description

In view of the above technical features, the main effects of the locking structure with self-locking internal threads of the present utility model will be apparent from the following embodiments.

Referring to fig. 1 and 2, the present utility model has a locking structure with self-locking internal threads, which is used with a bolt 3, and comprises a body 1 and a plurality of fixing screws 2.

Referring to fig. 3 and 4, the body 1 is provided with an inner thread hole 11 and a plurality of grooves 12 along an axial direction D1, the inner thread hole 11 has an inner thread bottom diameter 111 and an inner thread inner diameter 112 along a radial direction D2, a contact area 113 is formed between the inner thread bottom diameter 111 and the inner thread inner diameter 112, the grooves 12 intersect with the contact area 113 and are communicated with the inner thread hole 11, and the groove walls of the grooves 12 are separated from the inner thread inner diameter 112 along the radial direction D2 by a distance W2, wherein the distance W2 is the closest position between the groove walls of the grooves 12 and the inner thread inner diameter 112; specifically, the body 1 is a nut, and has a hexagonal shape, a top surface and a bottom surface opposite to each other along the axial direction D1, and six side surfaces between the top surface and the bottom surface, six grooves 12 are disposed along the axial direction D1 and extend through the top surface to the bottom surface, the grooves 12 are circular holes, each groove 12 is disposed around the center of the inner screw hole 11, and any two adjacent grooves 12 form an included angle with the center of the inner screw hole 11, and the included angle is sixty degrees. The contact area 113 has a width W1 along the radial direction D2, and the width W1 is the offset of the inner thread bottom diameter 111 from the radial direction D2 to the inner thread inner diameter 112. The distance W2 is between 40% and 60% of the width W1, that is, the inner side of the groove wall of the accommodating groove 12 protrudes toward the inner diameter 112 along the radial direction D2 and is cut at the inner thread root diameter 111, so that the accommodating groove 12 communicates with the inner thread hole 11 to intersect at the contact area 113, and an inner thread peak 114 of the inner thread hole 11 is a complete and continuous thread.

Referring to fig. 3, 4 and 5, the fixing screws 2 respectively extend into the grooves 12 and are fixed to the body 1, so that the threads of the fixing screws 2 intersect the contact area 113, and the hardness of the fixing screws 2 is lower than that of the bolts 3 and the body 1; specifically, the outer diameter of the fixing screw 2 is larger than the aperture of the round hole, the length of the fixing screw 2 is half of the depth of the round hole, the end of the fixing screw 2 is tapered or flat, which is not limited herein, for example, a screw or a bolt, in this embodiment, the end of the fixing screw 2 is tapered, when the fixing screw 2 is inserted into and tightly fitted into the round hole, the tapered end is aligned with and placed into the round hole, the screw thread of the fixing screw 2 contacts the inner wall of the round hole to be pressed, and when the screw thread of the fixing screw 2 is deformed, a friction force is generated between the fixing screw 2 and the inner wall of the round hole, so that the fixing screw 2 is fixed to the body 1, and the fixing screw 2 is not separated from the body 1 due to external force. In the present embodiment, two fixing screws 2 are included, but the present utility model is not limited thereto, and can be adjusted according to requirements, for example, six, five, four, three or one according to the vibration of the machine during operation.

Referring to fig. 3, 6 and 7, when the bolt 3 is fixed to the body 1 by the internal and external screw threads, a small gap 4 is formed between the bolt 3 and the internal screw thread hole 11, so that the internal and external screw threads can be easily locked and combined, which is described as a conventional technology of the internal and external screw thread combination. By placing the fixing screw 2 into the accommodating groove 12 and making the fixing screw 2 intersect with the area of the inner screw root of the inner screw hole 11, when the bolt 3 is screwed into the inner screw hole 11 and combined with the body 1, an outer screw crest 31 of the bolt 3 passes through the contact area 113, the outer screw crest 31 sequentially bites along the inner screw of the inner screw hole 11 along the normal force, and simultaneously, the outer screw crest 31 of the bolt 3 contacts and presses the screw thread of the fixing screw 2 placed in the accommodating groove 12, wherein in the best mode, about half of the outer screw crest 31 contacts the screw thread of the fixing screw 2, too much contact can make the bolt 3 difficult to be screwed into the inner screw hole 11, and too little contact can make the bolt 3 unable to have proper contact area with the fixing screw 2 after being screwed into the inner screw hole 11. The external thread crest 31 is contacted and pressed to generate a deformation part 21 on the thread of the fixed screw 2, and the deformation part 21 of the fixed screw 2 is further filled in the gap 4 between the bolt 3 and the internal thread hole 11, so that when the body 1 is rotated and moved relative to the bolt 3, namely, when the internal thread and the external thread are mutually locked, a biting force is generated between the external thread crest 31 of the bolt 3 and the fixed screw 2 in the radial direction D2 through the deformation part 21 of the fixed screw 2, and the bolt 3 and the body 1 are not loosened and separated due to external force vibration along the axial direction D1. Specifically, in actual use, the engagement force can be generated by only inserting the fixing screw 2 into the groove 12 at half the depth.

Referring to fig. 8 and 9, when the body 1 is repeatedly detached to make the engagement force insufficient or lose the engagement force, the fixing screw 2 placed in the half depth of the receiving groove 12 can be completely driven into the receiving groove 12 along the axial direction D1, and when the bolt 3 is re-combined with the body 1, the threads on the fixing screw 2 need to be re-matched with the outer screw crest 31 of the bolt 3 and be pressed and deformed by the outer screw crest 31, so that the threads on the fixing screw 2 are pressed and re-fill the gap 4, thereby, the engagement force is re-obtained between the outer screw crest 31 of the bolt 3 and the fixing screw 2 along the radial direction D2, so that the bolt 3 and the body 1 cannot be loosened and separated due to external force vibration along the axial direction D1.

Referring to fig. 10 and 11, in another embodiment, the present disclosure may be disposed on a workpiece 1A, where the workpiece 1A has an inner thread hole 11A and a plurality of grooves 12A, and is combined with a bolt 3A to the workpiece 1A, and the assembly manner is the same as the previous embodiment, so that, for example, a plurality of fixing screws 2A may be first placed in half of the depth of the grooves 12A, and when the bolt 3A and the workpiece 1A gradually lose the engagement force after long-term use, the fixing screws 2A may be completely driven into the grooves 12A, so that the engagement force between the bolt 3A and the fixing screws 2A is obtained again. Accordingly, the corresponding bolt 3A locked on the processing workpiece 1A is not easy to loosen and shake due to external force vibration.

The operation, use and efficacy of the present utility model will be fully understood from the description of the embodiments given above, which are merely preferred embodiments of the utility model, but do not limit the scope of the utility model, i.e., the utility model is not limited to the claims and the description of the utility model, but is capable of modification in accordance with the simple equivalent arrangements and the equivalent arrangements.

Claims (8)

1. A locking structure with self-locking internal threads for use with a bolt, the locking structure with self-locking internal threads comprising:

the body is axially provided with an inner screw hole and at least one containing groove, the inner screw hole is radially provided with an inner screw bottom diameter and an inner screw inner diameter, a contact area is formed between the inner screw bottom diameter and the inner screw inner diameter in a surrounding mode, the containing groove is intersected with the contact area and communicated with the inner screw hole, and the groove wall of the containing groove is radially separated from the inner screw inner diameter by a distance;

the fixing screw piece stretches into the containing groove and is fixed on the body, threads of the fixing screw piece are intersected with the contact area, and the hardness of the material of the fixing screw piece is lower than that of the material of the bolt and the body;

the screw bolt is screwed into the inner screw thread hole to be combined with the body, and the outer screw thread crest of the screw bolt contacts and presses the screw thread of the fixed screw through the contact area, so that the screw thread of the fixed screw is deformed to generate a biting force between the screw bolt and the fixed screw in the radial direction.

2. The locking structure with self-locking internal thread according to claim 1, wherein the receiving groove is a circular hole, the outer diameter of the fixing screw is larger than the aperture of the circular hole, and the fixing screw extends into and is tightly matched with the circular hole.

3. The locking structure with self-locking internal thread according to claim 2, wherein the threads of the fixing screw contact the inner wall of the circular hole to be deformed by extrusion, so that a friction force is generated between the fixing screw and the inner wall of the circular hole.

4. The locking structure with self-locking internal threads according to claim 1, wherein the locking structure comprises a plurality of accommodating grooves and a plurality of fixing screw members, each fixing screw member extends into each accommodating groove, each accommodating groove is arranged around the internal screw hole, and any two adjacent accommodating grooves form an included angle with the internal screw hole as a center.

5. The locking structure with self-locking internal threads of claim 4, wherein there are six pockets and six retaining screws, the included angle being sixty degrees.

6. A locking structure with self-locking internal threads as recited in claim 1, wherein half of said pocket radially intersects said contact area, and said male thread crest of said bolt passes through said contact area such that said male thread crest radially half contacts and presses against the threads of said retaining screw.

7. The locking structure with self-locking internal threads as recited in claim 1, wherein the body is a nut.

8. The locking structure with self-locking internal thread according to claim 1, wherein said fixing screw is one of a screw and a bolt.