Compression assembly type lock bolt

Abstract

The application discloses a combined anti-loosening bolt for pressure, which comprises a bolt (1) and an inner rod (2). The outer surface of the bolt (1) is the same as that of the existing product. A hole is drilled in the bolt (1). A cross line is formed on the outer surface of the taper hole. The screw rod is cut into four equal parts. The hole has a thread at the end of the bolt (1) head and a taper hole at the other end. The inner rod (2) has a taper at one end and a thread at the other end. The end is square. In use, the inner rod (2) is inserted into the taper hole of the bolt (1). After the two connected parts are placed, the bolt (1) is inserted into the thread of the parts and is screwed. The inner rod (2) is rotated and moves towards the head of the bolt (1). The taper surface of the inner rod (2) presses the taper hole surface of the bolt (1). The thread in the hole of the connected parts is pressed. The pressure of the thread is increased. The friction between the connected parts and the bolt (1) is increased. The bolt (1) is not easy to loosen.

Description

Technical Field

[0001] This invention relates to bolts for connecting two components together. background

[0002] When using existing bolts to connect two components, one method involves tapping threads into one component, placing the other component on top, and then threading a bolt through a hole in the upper component and into the threaded hole in the lower component. Another method involves drilling holes in both components, passing the bolt through these holes, and then screwing on a nut. These methods are generally fine for connections under normal conditions. However, they may loosen under conditions of vibration, dynamic loads, or alternating loads. Summary of the Invention

[0003] The problem this invention aims to solve is to provide a robust method that ensures bolts will not loosen when connecting parts under conditions such as vibration, dynamic load, and alternating load.

[0004] To solve the above problems, the working principle of this invention is as follows: A groove is cut into the threaded end of the bolt, and a through hole is drilled in the middle of the bolt; the grooved end is a tapered hole, and the other end is a threaded hole; one end of the inner rod is a tapered surface, and the other end is a threaded rod, with the end being a cuboid (square or hexagonal, etc.). After inserting the inner rod into the inner hole of the bolt and rotating it, the threads on the inner rod enter the threads in the bolt hole, but the tapered surface of the inner rod does not contact the tapered hole in the bolt hole; the two parts to be fastened are placed, the bolt is screwed into the threaded hole of the parts, and after the two parts are pressed together, the cuboid end of the inner rod is clamped and rotated. The tapered truncated cone of the inner rod presses against the tapered hole cut by the bolt, and the threads on the outer surface of the bolt press against the threads on the workpiece, increasing the friction between the threads of the bolt and the workpiece, making it difficult to loosen the fastened parts.

[0005] Alternatively, instead of tapping the bolt's inner hole, the inner rod can be passed through, and then a small nut can be used to interact with the inner rod.

[0006] After using the above method, the two parts are tightened and will not loosen when subjected to external vibration. Attached Figure Description

[0007] Appendix Figure 1 This is a structural diagram of the first embodiment of the anti-loosening bolt of the present invention.

[0008] Appendix Figure 2 This is a partial structural diagram of the second embodiment of the anti-loosening bolt of the present invention.

[0009] Appendix Figure 3 This is a partial structural diagram of the third embodiment of the anti-loosening bolt of the present invention. Example

[0010] In the appendix Figure 1In the first embodiment shown, the anti-loosening bolt of the present invention includes a bolt (1) and an inner rod (2). The bolt (1) has the same appearance as existing products. An inner hole is drilled in the bolt (1). A cross line is opened at the position of the lead screw outside the conical hole. The lead screw is cut into four equal parts. The inner hole has a thread at one end near the head of the bolt (1), and the other end is a conical hole. One end of the inner rod (2) is conical; the other end has a thread and the end is square. In use, insert the inner rod (2) through the conical hole end of the bolt (1) and screw it in a certain distance so that the conical surface of the inner rod (2) does not contact the conical hole surface of the bolt (1). After placing the two interconnected parts, insert the bolt (1) into the threaded hole of the part and tighten it. Then, rotate the square body at the end of the inner rod (2). The inner rod (2) moves towards the head of the bolt (1). The conical surface of the inner rod (2) presses against the conical hole surface of the bolt (1). After the conical hole surface is compressed, the bolt (1) end, which is divided into four parts, is squeezed into the thread in the threaded hole of the connected part, thereby increasing the pressure of the thread. The increased thread pressure increases the friction between the connected part and the bolt (1), making the bolt (1) less likely to loosen. In addition, the thread at the end of the bolt (1) is cut into four equal parts, which can eliminate machining errors and make the bolt (1) less likely to loosen.

[0011] In the appendix Figure 2 The second embodiment shown differs from the first embodiment in that a small nut (3) is added, and there are no threads in the inner hole of the bolt (1). One end of the inner rod (2) passes through the hole of the bolt (1), and then the small nut (3) is screwed onto the threads at the end of the inner rod (2). This achieves the purpose of the first embodiment.

[0012] In the appendix Figure 3 In the third embodiment shown, it differs from the first embodiment in that a nut (4) is added. When the two parts are placed together, the bolt (1) passes through the holes on them, the nut (4) is inserted to press them together, and then the inner rod (2) is rotated so that the tapered surface of the inner rod (2) presses against the tapered hole surface of the bolt (1), thereby causing the opening of the bolt (1) to deform slightly outward, and its threads press against the threads on the nut (4)...; thus achieving the effect of the first embodiment.

[0013] This invention is not limited to the above forms. When the first embodiment is not a cross line but a straight line, or is cut into six or eight equal parts; when there is an elastic washer between the small nut (3) and the fastened part in the second embodiment; and when the above forms are combined to form new forms, all of these are included in this invention.

Claims

1. A type of anti-loosening bolt with a compression fitting, wherein the bolt (1) has a groove at the threaded end and the threaded rod is cut into four equal parts, characterized in that: An inner hole is drilled in the bolt (1). The inner hole has a thread at one end near the head of the bolt (1) and a tapered hole at the other end. One end of the inner rod (2) is tapered, and the other end has a thread and a square end. When in use, the inner rod (2) is inserted through the tapered hole end of the bolt (1) and then screwed in a certain distance so that the truncated cone surface of the inner rod (2) does not contact the tapered hole surface of the bolt (1). After the two interconnected parts are placed, the bolt (1) is inserted into the threaded hole of the part and tightened. Then, the square body at the end of the inner rod (2) is rotated, and the inner rod (2) moves towards the bolt. (1) The rod head moves in the direction of the cone. The cone surface of the inner rod (2) presses against the cone hole surface of the bolt (1). After the cone hole surface is pressed, the ends of the bolt (1) which are divided into four parts are squeezed into the threads in the threaded holes of the connected parts, thereby increasing the pressure of the threads. With the increase of the thread pressure, the friction between the connected parts and the bolt (1) increases, and the bolt (1) is not easy to loosen. In addition, the threads at the end of the bolt (1) are cut into four equal parts, which can eliminate the processing error and make the bolt (1) not easy to loosen.

2. A type of anti-loosening bolt with a compression fitting, wherein the bolt (1) has a groove at the threaded end and the threaded rod is cut into four equal parts, characterized in that: The bolt (1) has an inner hole drilled in it, and the other end is a tapered hole. The inner rod (2) has a tapered end and a wire on the other end, with a square end. When in use, the inner rod (2) is inserted through the tapered hole end of the bolt (1) and then screwed in a certain distance so that the conical surface of the inner rod (2) does not contact the conical hole surface of the bolt (1). The small nut (3) is screwed into the thread at the end of the inner rod (2); after the two interconnected parts are placed, the bolt (1) is inserted into the threaded hole of the part and tightened, the small nut (3) is clamped, and the square body at the end of the inner rod (2) is rotated. The inner rod (2) moves towards the head of the bolt (1). The conical surface of the inner rod (2) presses against the conical hole surface of the bolt (1). After the conical hole surface is pressed, the bolt (1) end, which is divided into four parts, is squeezed into the thread in the threaded hole of the connected part, thereby increasing the pressure of the thread; the thread pressure increases, the friction between the connected part and the bolt (1) increases, and the bolt (1) is not easy to loosen; in addition, the thread at the end of the bolt (1) is cut into four equal parts, so as to eliminate the processing error and make the bolt (1) not easy to loosen.

3. A type of anti-loosening bolt with a compression fitting, wherein the bolt (1) has a groove at the threaded end and the threaded rod is cut into four equal parts, characterized in that: An inner hole is drilled in the bolt (1). The inner hole has a thread at one end near the head of the bolt (1) and a tapered hole at the other end. One end of the inner rod (2) is tapered, and the other end has a thread and a square end. When in use, the inner rod (2) is inserted through the tapered hole end of the bolt (1) and then screwed in a certain distance so that the truncated cone surface of the inner rod (2) does not contact the tapered hole surface of the bolt (1). After the two interconnected parts are placed, the bolt (1) passes through the holes of the two parts, the nut (4) is inserted, and it is tightened. The square body at the end of the inner rod (2) is rotated. (2) Move towards the head of the bolt (1), the conical surface of the inner rod (2) presses against the conical hole surface of the bolt (1). After the conical hole surface is pressed, the ends of the bolt (1) which are divided into four parts are squeezed into the threads in the threaded hole of the nut (1), thereby increasing the pressure of the threads. With the increase of the thread pressure, the friction between the nut (4) and the bolt (1) increases, and the bolt (1) is not easy to loosen. In addition, the threads at the end of the bolt (1) are cut into four equal parts, which can eliminate the processing error and make the bolt (1) not easy to loosen.

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