Combined nut capable of achieving self-locking and looseness prevention

Abstract

The utility model discloses a self-locking anti-loosening combined nut which comprises an auxiliary nut and a main nut. The nut is characterized in that the main nut is composed of a main nut head, a screw cylinder, a connecting part and a conical cylinder, screw cylinder external threads are arranged on the outer wall of the screw cylinder, the main nut head is arranged at the lower end of the screw cylinder, the upper end of the screw cylinder is fixedly connected with the lower end of the conical cylinder through the connecting part, the central axis of the screw cylinder coincides with the central axis of the conical cylinder, and screw cylinder internal threads are arranged on the side walls of inner cavities of the screw cylinder and the main nut head. A transverse notch is formed between the upper end edge of the screw cylinder and the lower end edge of the conical cylinder; two vertical notches are formed in the circumferential wall of the conical cylinder; a conical pressing opening matched with the inclined face of the outer wall of the conical cylinder is formed in the side wall of an inner cavity of the upper end of the auxiliary nut. According to the utility model, the main nut is prevented from loosening on the screw rod through the locking effect of the auxiliary nut on the main nut, so that a part between the main nut and the screw rod is always in a clamped state.

Description

TECHNICAL FIELD

[0001] The utility model relates to an improvement of a nut, in particular to a combined nut capable of self-locking and preventing loosening. BACKGROUND

[0002] The nut is a fastener with internal thread, and its outer surface is usually hexagonal to facilitate rotation assembly with tools. The screw rod is a rod-shaped part with external thread, and its end is provided with a screw rod head. The outer wall of the screw rod body is provided with external thread for engaging with the internal thread of the nut. The outer surface of the screw rod head is usually hexagonal or round to facilitate rotation with tools. When used in bridges, steel structures, machinery, aerospace, machine tools and other equipment, the nut and the screw rod are assembled by engaging the internal thread of the nut with the external thread of the screw rod, and the axial force is generated by rotating the nut or the screw rod to clamp the components between them. The deficiency of the traditional nut is that when the nut and the screw rod are used as fasteners, the equipment in the use environment will vibrate, causing the nut to loosen, and the components between them cannot maintain the original clamping state, which may cause safety accidents and significant economic losses. SUMMARY

[0003] The utility model discloses a combined nut capable of self-locking and preventing loosening, which generates locking effect on the main nut through the secondary nut, prevents the main nut from loosening, makes the connection between the main nut and the screw rod more firm, and is convenient to install and use.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] The combined nut capable of self-locking and preventing loosening comprises a secondary nut and a main nut. The inner cavity side wall of the secondary nut is provided with a secondary nut internal thread. The main nut comprises a main nut head, a screw cylinder, a connecting part and a tapered cylinder. The outer wall of the screw cylinder is provided with a screw cylinder external thread for engaging with the secondary nut internal thread of the secondary nut. The lower end of the screw cylinder is fixedly provided with the main nut head. The upper end of the screw cylinder is connected and fixed with the lower end of the tapered cylinder through the connecting part on the side wall. The center axes of the screw cylinder and the tapered cylinder coincide. The inner cavity side wall of the screw cylinder and the main nut head is provided with a screw cylinder internal thread. The upper end of the screw cylinder is provided with a transverse gap between the lower end of the tapered cylinder. The outer wall of the tapered cylinder is a slope. The circumferential wall of the tapered cylinder is provided with two vertical gaps. One vertical gap is located at the middle part of the connecting part, and the other vertical gap is located on the side wall of the tapered cylinder above the transverse gap. The inner cavity side wall of the upper end of the secondary nut is provided with a tapered pressing opening matched with the slope of the outer wall of the tapered cylinder.

[0006] The width of the transverse gap is the same as the width of the connecting part.

[0007] The upper end outer wall of the taper cylinder is provided with a ring groove, and a snap spring is arranged in the ring groove.

[0008] The inner wall of the taper cylinder is provided with anti-skid lines.

[0009] The anti-skid lines are taper cylinder internal threads, and the specifications of the taper cylinder internal threads are the same as the specifications of the screw cylinder internal threads of the screw cylinder inner wall.

[0010] As an improvement, the anti-skid lines are spaced taper cylinder internal protrusions, and the taper cylinder internal protrusions are matched with the screw cylinder internal threads of the screw cylinder inner wall.

[0011] The utility model discloses the beneficial effect lies in: through the locking effect of the secondary nut to the main nut, the taper cylinder of the upper end of the main nut is locked on the screw rod, prevents the main nut from loosening on the screw rod, makes the component between the main nut and the screw rod always be in the state of being clamped, guarantees the fastening ability of the main nut and the screw rod continues high efficiency, and the installation and use are also more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the front view schematic drawing of the utility model;

[0013] Figure 2 It is the sectional view schematic drawing of the utility model;

[0014] Figure 3 It is the structure sectional view schematic drawing of the utility model after being assembled with the screw rod;

[0015] Figure 4 It is the structure overhead enlarged schematic drawing of the snap spring of the utility model;

[0016] Figure 5 It is the structure sectional view enlarged schematic drawing of the secondary nut of the utility model;

[0017] Figure 6 It is the structure front view enlarged schematic drawing of the main nut of the utility model;

[0018] Figure 7 It is the structure left view enlarged schematic drawing of the main nut of the utility model;

[0019] Figure 8 It is the structure overhead enlarged schematic drawing of the main nut in embodiment 1;

[0020] Figure 9 It is the structure bottom view enlarged schematic drawing of the main nut in embodiment 1;

[0021] Figure 10 It is the structure sectional view schematic drawing of the utility model along Figure 8 Direction A-A.

[0022] Figure 11 An enlarged schematic view of the structure of the main nut in Example 2 from above;

[0023] Figure 12 A schematic view of the structure of the present application along Figure 11 the B-B direction.

[0024] In the figure: 1, the secondary nut; 11, the internal thread of the secondary nut; 12, the conical pressing opening; 2, the main nut; 20, the transverse notch; 21, the head of the main nut; 22, the screw cylinder; 23, the tapered cylinder; 24, the external thread of the screw cylinder; 25, the connecting portion; 26, the annular groove; 27, the vertical notch; 28, the internal thread of the tapered cylinder; 281, the internal protrusion of the tapered cylinder; 29, the internal thread of the screw cylinder; 3, the circlip; 31, the opening; 4, the screw rod; 41, the external thread of the screw rod. DETAILED DESCRIPTION Example 1:

[0025] Referring to Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 the present application is manufactured. When assembled with the screw rod for use, as shown in Figure 3 .

[0026] The self-locking and anti-loosening combined nut comprises a secondary nut 1 and a primary nut 2, and the inner cavity side wall of the secondary nut 1 is provided with a secondary nut inner thread 11; characterized in that the primary nut 2 is composed of a primary nut head 21, a screw cylinder 22, a connecting part 25 and a tapered cylinder 23, the outer wall of the screw cylinder 22 is provided with a screw cylinder outer thread 24 which is engaged with the secondary nut inner thread 11 of the secondary nut 1, the lower end of the screw cylinder 22 is fixedly provided with the primary nut head 21, the upper end of the screw cylinder 22 is connected and fixed with the lower end of the tapered cylinder 23 through the connecting part 25 on the side wall, the central axes of the screw cylinder 22 and the tapered cylinder 23 coincide, the inner cavity side wall of the screw cylinder 22 and the primary nut head 21 is provided with a screw cylinder inner thread 29, the upper end of the screw cylinder 22 is provided with a transverse gap 20 between the lower end of the tapered cylinder 23, the outer wall of the tapered cylinder 23 is a slope, the circumferential wall of the tapered cylinder 23 is provided with two vertical gaps 27, one of which is located at the middle part of the connecting part 25, and the other is located on the side wall of the tapered cylinder 23 above the transverse gap 20, the inner cavity side wall of the upper end of the secondary nut 1 is provided with a tapered pressing opening 12 which is matched with the slope of the outer wall of the tapered cylinder 23, when the secondary nut 1 is rotated and tightened to the primary nut 2, the tapered pressing opening 12 of the upper end of the secondary nut 1 will extrude the tapered cylinder 23 inward, so that the tapered cylinder 23 is slightly deformed and tightly holds the outer wall of the screw rod 4, preventing the primary nut 2 from loosening.

[0027] The width of the transverse gap 20 is the same as the width of the connecting part 25, and the width of the transverse gap 20 refers to the distance between the upper end of the screw cylinder 22 and the lower end of the tapered cylinder 23.

[0028] The outer wall of the upper end of the tapered cylinder 23 is provided with a ring groove 26, the ring groove 26 is provided with a circlip 3, the circlip 3 is in the form of a ring, the circumference of the circlip 3 is provided with an opening 31, and the outer diameter of the circlip 3 is greater than the inner diameter of the screw hole of the secondary nut 1; after the primary nut 2 and the screw rod 4 are assembled, the secondary nut 1 is assembled to the primary nut 2, and finally the circlip 3 is embedded into the ring groove 26 of the tapered cylinder 23, so as to prevent the secondary nut 1 from loosening and falling off from the primary nut 2.

[0029] The inner wall of the tapered cylinder 23 is provided with anti-skid lines, such as Figure 8 , Figure 10As shown, the anti-skid thread is a tapered inner thread 28, the tapered inner thread 28 has the same specification as the screw inner thread 29 on the inner wall of the screw cylinder 22, so that the screw outer thread 41 on the outer wall of the screw rod 4 is engaged with the screw inner thread 29 of the main nut 2 and the tapered inner thread 28 of the tapered cylinder 23, which can easily rotate the main nut 2 to be installed on the screw rod 4, and then install the secondary nut 1 on the main nut 2, the tapered pressing opening 12 at the upper end of the secondary nut 1 will be inwardly extruded to the tapered cylinder 23, the tapered cylinder 23 will be slightly deformed, and the tapered inner thread 28 on the inner wall of the tapered cylinder 23 will be extruded with the screw outer thread 41 on the outer wall of the screw rod 4, thereby preventing the main nut 2 from loosening.

[0030] The outer surface of the secondary nut 1 is hexagonal, and the outer surface of the main nut head 21 of the main nut 2 is hexagonal, so as to facilitate rotation assembly. The two vertical notches 27 are symmetrically arranged on the circumferential wall of the tapered cylinder 23. Example 2:

[0031] As an improvement, as shown in Figure 11 、 Figure 12 As shown.

[0032] The inner wall of the tapered cylinder 23 is provided with an anti-skid thread, which is a tapered inner protrusion 281 arranged at intervals, the tapered inner protrusion 281 is matched with the screw inner thread 29 on the inner wall of the screw cylinder 22, and the inner diameter formed by all the tapered inner protrusions 281 is the same as the inner diameter of the screw inner thread 29 on the inner wall of the screw cylinder 22; so that the main nut 2 can be easily rotated and installed on the screw rod 4, and then the secondary nut 1 is installed on the main nut 2, the tapered pressing opening 12 at the upper end of the secondary nut 1 will be inwardly extruded to the tapered cylinder 23, the tapered cylinder 23 will be slightly deformed, and the tapered inner protrusion 281 on the inner wall of the tapered cylinder 23 will be extruded with the screw outer thread 41 on the outer wall of the screw rod 4, thereby preventing the main nut 2 from loosening.

Claims

1. A self-locking anti-loose combined nut, comprising a secondary nut (1) and a primary nut (2), an inner cavity side wall of the secondary nut (1) is provided with a secondary nut inner thread (11); characterized in that: The main nut (2) is composed of a main nut head (21), a screw cylinder (22), a connecting part (25) and a taper cylinder (23), the outer wall of the screw cylinder (22) is provided with a screw cylinder outer thread (24) which is engaged with the inner thread (11) of the secondary nut (1), the lower end of the screw cylinder (22) is fixedly provided with the main nut head (21), the upper end of the screw cylinder (22) is connected and fixed with the lower end of the taper cylinder (23) through the connecting part (25) on the side wall, the central axes of the screw cylinder (22) and the taper cylinder (23) coincide, the inner cavity side wall of the screw cylinder (22) and the main nut head (21) is provided with a screw cylinder inner thread (29), the upper end of the screw cylinder (22) is provided with a transverse notch (20) between the lower end of the taper cylinder (23), the outer wall of the taper cylinder (23) is a slope; the circumferential wall of the taper cylinder (23) is provided with two vertical notches (27), one of which is located at the middle part of the connecting part (25), and the other is located on the side wall of the taper cylinder (23) above the transverse notch (20); the inner cavity side wall of the upper end of the secondary nut (1) is provided with a tapered pressure port (12) which is matched with the slope of the outer wall of the taper cylinder (23).

2. A self-locking anti-loose combined nut according to claim 1, characterized in that: The width of the transverse notch (20) is the same as the width of the connecting part (25).

3. The self-locking anti-loose combined nut according to claim 1, characterized in that: The outer wall of the upper end of the taper cylinder (23) is provided with a ring groove (26), the ring groove (26) is provided with a circlip (3), the circlip (3) is annular, the circumference of the circlip (3) is provided with an opening (31), and the outer diameter of the circlip (3) is greater than the inner diameter of the screw hole of the secondary nut (1).

4. The self-locking anti-loose combined nut according to claim 1, characterized in that: The inner wall of the taper cylinder (23) is provided with anti-skid lines.

5. A self-locking anti-loose combined nut according to claim 4, characterized in that: The anti-skid lines are taper cylinder inner threads (28), and the specifications of the taper cylinder inner threads (28) are the same as those of the screw cylinder inner threads (29) on the inner wall of the screw cylinder (22).

6. The self-locking anti-loose combined nut according to claim 4, characterized in that: The anti-skid lines are taper cylinder inner protrusions (281) which are arranged at intervals and matched with the screw cylinder inner threads (29) on the inner wall of the screw cylinder (22).

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