Staggered joint occlusion type locknut

Abstract

The utility model belongs to the technical field of nuts, and particularly relates to a staggered joint occlusion type locknut which comprises a nut assembly, a screw rod, an upper fastening plate and a lower fastening plate, and the screw rod penetrates through the upper fastening plate and the lower fastening plate to be connected with the nut assembly pressed on the surface of the upper fastening plate. The backing ring is arranged on the bottom face of the lower nut, and an eccentric pushing mechanism is arranged between the backing ring and the lower nut. According to the self-locking nut, the nut assembly and the eccentric pushing mechanism are used in cooperation, the upper meshing teeth and the lower meshing teeth on the nut assembly achieve the self-locking function after meshing, and therefore the upper nut and the lower nut form rotating stress linkage. And meanwhile, the eccentric pushing mechanism can generate circumferential pushing on the lower nut through the matching effect of an eccentric groove and an eccentric pushing convex ring, so that the thread extrusion force between the lower nut and the screw rod is enhanced, and meanwhile, the staggered extrusion force between the upper occlusion teeth and the lower occlusion teeth is increased. By means of the structural design, the triple locking effect is achieved, and the shockproof and anti-loosening performance is remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of nut technology, specifically relating to a staggered interlocking anti-loosening nut. Background Technology

[0002] In the field of mechanical connections, nuts are among the most commonly used fasteners, and their anti-loosening performance directly affects the safety and reliability of equipment operation. Traditional anti-loosening nuts often employ double-nut structures or add elastic washers to improve their anti-loosening effect, but these methods still have significant shortcomings in practical applications. Especially in operating conditions subjected to severe vibration or alternating loads, existing anti-loosening nuts are prone to loosening after prolonged use. The main reason for this is that the traditional double-nut structure relies solely on the simple superposition of thread preload, lacking an effective locking mechanism; while the elastic washer is prone to losing elasticity due to material fatigue, leading to a decline in anti-loosening performance. Therefore, this invention proposes a staggered-lock anti-loosening nut to solve the above-mentioned technical problems. Utility Model Content

[0003] The purpose of this invention is to provide a staggered interlocking anti-loosening nut that can solve the above-mentioned technical problems.

[0004] The specific technical solution adopted by this utility model is as follows:

[0005] This utility model provides a staggered interlocking anti-loosening nut, including a nut assembly, a screw, an upper fastening plate and a lower fastening plate, wherein the screw passes through the upper fastening plate and the lower fastening plate and is connected to the nut assembly pressed on the surface of the upper fastening plate;

[0006] The nut assembly includes an upper nut, a lower nut, and a washer. The bottom surface of the upper nut is fixed with a plurality of upper engagement teeth distributed at 7.5° intervals around the nut center. The surface of the lower nut is fixed with a plurality of lower engagement teeth distributed at 7.5° intervals around the nut center. The opposing surfaces of the upper and lower engagement teeth are provided with mutually symmetrical inclined surfaces. The upper engagement teeth are in-between with two adjacent lower engagement teeth.

[0007] The washer ring is disposed on the bottom surface of the lower nut, and an eccentric pushing mechanism is provided between them.

[0008] Preferably, the eccentric pushing mechanism includes an eccentric groove and an eccentric pushing protrusion. The eccentric pushing protrusion is inserted into the eccentric groove. The eccentric groove is located on the bottom surface of the lower nut. The eccentric pushing protrusion is integrally fixed on the surface of the washer, and both the eccentric pushing protrusion and the washer are movably sleeved on the screw.

[0009] Preferably, the bottom surface of the washer is integrally fixed with a plurality of conical teeth evenly distributed around the washer, and the conical teeth abut against the surface of the upper fastening plate.

[0010] Preferably, the inclination angle of the ramps on the upper and lower occlusal teeth is set between 5 and 7°.

[0011] Preferably, the eccentric gap between the eccentric groove and the outer diameter of the eccentric push ring is set between 3 and 15 mm.

[0012] Preferably, the depth of the eccentric groove is set to 1.5 times the height of the eccentric thrust ring, and the height of the eccentric thrust ring is set to one-third of the height of the lower nut.

[0013] The beneficial effects are:

[0014] This invention utilizes a nut assembly in conjunction with an eccentric pushing mechanism. The upper and lower engagement teeth on the nut assembly achieve a self-locking function after engagement, thus creating a rotational force linkage between the upper and lower nuts. Simultaneously, the eccentric pushing mechanism, through the interaction of the eccentric groove and the eccentric pushing ring, can circumferentially push the lower nut, thereby enhancing the thread compression force between the lower nut and the screw, and increasing the staggered compression force between the upper and lower engagement teeth. This structural design achieves a triple locking effect, significantly improving shock resistance and anti-loosening performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model after installation;

[0016] Figure 2 This is a schematic diagram of the nut assembly in the separated state of this utility model;

[0017] Figure 3 This is a schematic diagram of the nut assembly of this utility model in a separated state, viewed from an oblique angle.

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of the nut assembly of this utility model.

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1. Upper nut; 11. Upper engagement tooth; 2. Lower nut; 21. Lower engagement tooth; 22. Eccentric groove; 1.1. Inclined surface; 3. Washer ring; 31. Eccentric thrust ring; 32. Tapered tooth; 4. Screw; 5. Upper fastening plate; 6. Lower fastening plate. Detailed Implementation

[0021] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0022] like Figure 1-4 As shown, a staggered interlocking anti-loosening nut includes a nut assembly, a screw 4, an upper fastening plate 5 and a lower fastening plate 6. The screw 4 passes through the upper fastening plate 5 and the lower fastening plate 6 and is connected to the nut assembly pressed against the surface of the upper fastening plate 5.

[0023] The nut assembly includes an upper nut 1, a lower nut 2, and a washer 3. The bottom surface of the upper nut 1 is fixed with a plurality of upper engagement teeth 11 distributed at 7.5° intervals around the center of the nut 1. The surface of the lower nut 2 is fixed with a plurality of lower engagement teeth 21 distributed at 7.5° intervals around the center of the lower nut 2. The opposing surfaces of the upper engagement teeth 11 and the lower engagement teeth 21 are provided with mutually symmetrical inclined surfaces 1.1. The upper engagement teeth 11 are internally engaged with two adjacent lower engagement teeth 21.

[0024] The washer 3 is located on the bottom surface of the lower nut 2, and an eccentric pushing mechanism is provided between them.

[0025] As an optional implementation, the eccentric pushing mechanism includes an eccentric groove 22 and an eccentric pushing protrusion 31. The eccentric pushing protrusion 31 is inserted into the eccentric groove 22. The eccentric groove 22 is opened on the bottom surface of the lower nut 2. The eccentric pushing protrusion 31 is integrally fixed on the surface of the washer 3. Both the eccentric pushing protrusion 31 and the washer 3 are movably sleeved on the screw 4. In this way, the eccentric pushing mechanism can cooperate with the nut assembly to perform staggered engagement of the upper nut 1 and the lower nut 2 of the nut assembly, and then perform eccentric pushing, thereby achieving secondary tightening of the lower nut 2 and effectively improving the anti-vibration and anti-loosening effect of the nut assembly.

[0026] See attached document Figure 3 and attached Figure 4 The bottom surface of the washer 3 is integrally fixed with multiple conical teeth 32 evenly distributed around the washer 3. The conical teeth 32 abut against the surface of the upper fastening plate 5. This allows the conical teeth 32 on the bottom surface of the washer 3 to contact the surface of the upper fastening plate 5 when the washer 3 is pressed against the surface of the upper fastening plate 5 by the lower nut 2, forming a multi-point pressing contact, thereby improving the anti-slip effect of the washer 3. At the same time, it can also provide support for the eccentric pushing movement when the eccentric push protrusion ring 31 and the eccentric groove 22 are inserted and rotated.

[0027] Furthermore, the inclination angle of the inclined surface 1.1 on the upper occlusal tooth 11 and the lower occlusal tooth 21 is set between 5-7°. This allows the upper occlusal tooth 11 and the lower occlusal tooth 21 to be pressed and pressed together when the upper nut 1 rotates and engages with the lower nut 2. This causes the two symmetrical inclined surfaces 1.1 to be pressed and misaligned, thereby achieving a state in which the upper nut 1 continuously rotates and drives the upper occlusal tooth 11 and the lower occlusal tooth 21 to engage in a staggered manner, improving the force linkage effect between the upper nut 1 and the lower nut 2.

[0028] Furthermore, the eccentric gap between the eccentric groove 22 and the outer diameter of the eccentric push ring 31 is set between 3-15mm. This design allows the eccentric push ring 31 to rotate when inserted into the eccentric groove 22, thereby pushing the lower nut 2 to produce circumferential displacement, thus increasing the thread extrusion force with the screw 4 and enhancing the anti-loosening effect.

[0029] Furthermore, the depth of the eccentric groove 22 is set to 1.5 times the height of the eccentric thrust ring 31, and the height of the eccentric thrust ring 31 is set to one-third of the height of the lower nut 2. This design allows the lower nut 2 to reduce the number of rotations required when rotating downwards, and effectively enhances the downward pressing force on the washer ring 3, thereby making the conical tooth 32 press more firmly against the surface of the upper fastening plate 5, achieving a reliable braking effect.

[0030] Using the above structure, the following steps are included:

[0031] 1. Pre-installation stage:

[0032] The screw 4 is passed through the lower fastening plate 6 and the upper fastening plate 5 in sequence, so that the nut assembly is initially screwed into the screw 4. At this time, the upper nut 1 and the lower nut 2 are not engaged, and the tapered teeth 32 of the washer 3 are initially in contact with the surface of the upper fastening plate 5.

[0033] 2. Initial tightening stage:

[0034] Use a wrench to rotate the upper nut 1, causing it to move downwards along the thread of the screw 4. When the bottom surface of the upper nut 1 contacts the top surface of the lower nut 2, the upper engagement tooth 11 begins to contact the inclined surface 1.1 of the lower engagement tooth 21. Continue rotating the upper nut 1, and guided by the 5-7° inclined surface 1.1, the upper engagement tooth 11 gradually engages in the gap between two adjacent lower engagement teeth 21, achieving staggered engagement.

[0035] 3. Occlusal locking phase:

[0036] As the upper nut 1 continues to rotate, the upper jaw 11 and the lower jaw 21 fully engage, forming the first layer of locking. At this time, the rotational force of the upper nut 1 is transmitted to the lower nut 2 through the jaws, causing the upper and lower nuts 2 to form a linkage and tightening effect, completing the second layer of locking.

[0037] 4. Eccentric pushing stage:

[0038] Keep the upper nut 1 fixed, and use a special tool to rotate the upper nut 1 and the lower nut 2 so that the eccentric groove 22 is inserted into the eccentric thrust ring 31, and push the washer ring 3 down to abut against the surface of the upper fastening plate 5. As the upper nut 1 and the lower nut 2 continue to rotate, the braking effect on the tapered tooth 32 and the upper fastening plate 5 is increased. At the same time, due to the 5-15mm eccentricity between the eccentric thrust ring 31 and the eccentric groove 22, a radial thrust is generated during rotation, which pushes the lower nut 2 to produce circumferential displacement, further enhancing the preload of the threaded pair of the lower nut 2, forming a third locking.

[0039] This installation process gradually increases the locking force in stages, first establishing a locking engagement, then enhancing pre-tightening through an eccentric mechanism, ultimately achieving triple anti-loosening protection. During operation, it is important to perform each step in sequence to ensure that each locking mechanism functions effectively.

[0040] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. This application is mainly used to protect mechanical devices. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, are implemented according to conventional methods in the field.

Claims

1. A staggered interlocking anti-loosening nut, characterized in that: It includes a nut assembly, a screw (4), an upper fastening plate (5) and a lower fastening plate (6), wherein the screw (4) passes through the upper fastening plate (5) and the lower fastening plate (6) and is connected to the nut assembly pressed against the surface of the upper fastening plate (5); The nut assembly includes an upper nut (1), a lower nut (2), and a washer (3). The bottom surface of the upper nut (1) is fixed with a plurality of upper teeth (11) arranged at 7.5° intervals around the center of the nut (1). The surface of the lower nut (2) is fixed with a plurality of lower teeth (21) arranged at 7.5° intervals around the center of the nut (2). The opposing surfaces of the upper teeth (11) and the lower teeth (21) are provided with mutually symmetrical inclined surfaces (1.1). The upper teeth (11) are in-between with the two adjacent lower teeth (21). The washer (3) is located on the bottom surface of the lower nut (2), and an eccentric pushing mechanism is provided between them.

2. The staggered interlocking anti-loosening nut according to claim 1, characterized in that: The eccentric pushing mechanism includes an eccentric groove (22) and an eccentric pushing ring (31). The eccentric pushing ring (31) is inserted into the eccentric groove (22). The eccentric groove (22) is opened on the bottom surface of the lower nut (2). The eccentric pushing ring (31) is integrally fixed on the surface of the washer (3). Both the eccentric pushing ring (31) and the washer (3) are movably sleeved on the screw (4).

3. The staggered interlocking anti-loosening nut according to claim 2, characterized in that: The bottom surface of the washer (3) is integrally fixed with a plurality of conical teeth (32) evenly distributed around the washer (3) as the center, and the conical teeth (32) abut against the surface of the upper fastening plate (5).

4. The staggered interlocking anti-loosening nut according to claim 3, characterized in that: The inclination angle of the ramp (1.1) on the upper occlusal tooth (11) and the lower occlusal tooth (21) is set between 5 and 7°.

5. The staggered interlocking anti-loosening nut according to claim 4, characterized in that: The eccentric gap between the eccentric groove (22) and the outer diameter of the eccentric thrust ring (31) is set between 3 and 15 mm.

6. The staggered interlocking anti-loosening nut according to claim 5, characterized in that: The depth of the eccentric groove (22) is set to 1.5 times the height of the eccentric thrust ring (31), and the height of the eccentric thrust ring (31) is set to one-third of the height of the lower nut (2).

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