Combined lock nut

Abstract

The utility model discloses a combined lock nut. An internal thread matched with a screw rod is arranged in the nut; arc-shaped ball grooves are formed in the axial direction and used for installing balls, at least one pair of arc-shaped ball grooves are symmetrically arranged, the balls and the screw roll in a friction mode from shallow to deep in the thread screwing direction, and a nut inner plug is arranged and plugged into a hole from one end of the nut to limit the balls; and the screw rod is screwed into the nut from one end without the inner plug and is screwed in after pressing the ball tightly. The inner plug is pushed out or retained in the nut; when the nut slightly rotates in a natural phenomenon, the friction force generated by close fit of the nut and the screw forces the ball to roll from the deep position of the groove to the shallow position, and the screw, the ball and the groove are forced to be further compressed and cannot rotate. No special tool is needed for installation. When the nut needs to be detached, the ball is extruded to deform and then the nut can be unscrewed only by applying a certain rotation torsion force to a common wrench. The screw thread of the screw nut is not damaged and can be repeatedly used.

Description

Technical Field

[0001] The utility model provides a combined anti-loosening nut, which belongs to the technical field of nuts and is suitable for use on all bolts and nut products, and is particularly suitable for use on transmission towers and other occasions where the nut is required not to be loose and no special tools are required. Background Art

[0002] There are many types of anti-loosening nuts on the market, but on transmission towers, basically a nut is added to the original nut to prevent the nut from loosening. However, the nut added later does not have the anti-loosening function and cannot prevent loosening. At present, there is no ideal product that will never loosen naturally for use on power fittings or transmission towers. For the safety of power transmission, a solution is urgently needed. Utility Model Content

[0003] The utility model provides a combined anti-loosening nut, which aims to solve the technical problem that the nut has no anti-loosening function and needs a special tool to unscrew it.

[0004] The technical solution of the utility model is achieved in this way:

[0005] A combined anti-loosening nut, comprising a nut, wherein the nut is provided with an internal thread matched with a screw rod; characterized in that:

[0006] An open ball groove is provided in the threaded part of the nut hole, which is deep into the threaded part and deep into the nut wall, and a ball is installed in the ball groove, and the ball and the ball groove are in rolling cooperation; a nut inner plug is provided, and the inner plug is inserted into the hole from one end of the inner hole of the nut to limit and fix the ball;

[0007] The screw is screwed into the nut from the end without the inner plug, and after pressing the ball, the screw is screwed out of the other end of the nut, and the inner plug is pushed out or retained in the nut;

[0008] The ball groove is an arc-shaped groove opened along the thread rotation direction or along the circumferential direction, and at least one pair is symmetrically arranged. The arc-shaped groove gradually deepens along the direction of thread tightening, and the length of the arc-shaped groove along the circumference does not exceed 2.5 times the diameter of the ball;

[0009] The diameter of the ball is not greater than 1.2 times the pitch, and the depth of the arcuate groove at the deepest radial part is set in such a way that 1 / 3 of the diameter of the placed ball is in the nut thread and the remaining part of the ball is inside the nut side wall behind the nut thread; the arcuate groove is set at the thread groove between two threads, and the ball rolls in cooperation with the arcuate groove.

[0010] A combined anti-loosening nut as described above, wherein the inner plug is an upper plug, and the upper plug is provided with a cylindrical plug body and a flange-type annular edge extending outward at its upper end, a card extending outward is provided on the outer edge of the cylindrical plug body, and a plurality of vertical side edges protruding from the cylindrical surface are provided on the cylindrical surface of the cylindrical plug body, and the bottom of the cylindrical plug body is recessed upward to form a circular ring bottom edge; the upper plug is inserted into the nut hole from the upper end of the nut, and the flange-type annular edge at the upper end is clamped at the upper end outside the nut to limit the position, the card is clamped in the ball groove to limit the ball, and the side edges are pressed and clamped on the internal thread of the nut; the screw is screwed into the nut from the lower end without the inner plug, and after pressing the ball, the other end of the nut is screwed out, and the upper plug is pushed out of the nut at the same time; the screw and the ball are tightly matched, and the upper plug is a plastic plug.

[0011] The described combined anti-loosening nut, wherein the inner plug is a lower plug, and the lower plug is composed of four columns arranged on an annular cover body, wherein a pair of symmetrical columns are limit columns, and the other pair of symmetrical columns are positioning columns, the limit columns are inclined columns with an arc-shaped surface at the upper end, and the nut is provided with an accommodating groove on the internal thread corresponding to the columns, the limit column and the positioning column are embedded in their respective accommodating grooves, the limit column extends into the ball groove and its arc-shaped surface buckles the ball to limit, the annular cover body is clamped on the outer end surface of the lower end of the nut to limit, the screw rod passes through the circular hole of the annular cover body of the lower plug from the lower end and is screwed into the nut, the limit column and the ball are pressed and the other end of the nut is screwed out, the screw rod and the ball are tightly matched, and the lower plug is a plastic plug; the arc length of the arc surface is not greater than 1 / 2 of the diameter of the ball.

[0012] In the combined anti-loosening nut, the ball is a spherical ball or a cylindrical roller.

[0013] In the combined anti-loosening nut, the ball is a flexible ball.

[0014] In the combined anti-loosening nut, the flexible ball is an aluminum alloy ball.

[0015] Beneficial effects of the utility model:

[0016] If the nut of the utility model is loose, the ball will roll into the shallow groove, thereby further pressing the screw rod, and the screw rod and the nut will no longer be loosened, so it has a good anti-loosening effect, and no special tools are used, and only an ordinary wrench is needed to unscrew the nut and reuse it, which is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a bottom view of a nut according to Embodiment 1 of the present utility model.

[0018] Figure 2 For Example 1 Figure 1 AA section view, schematic diagram of the plug and ball inserted into the nut,

[0019] Figure 3 For Example 1 Figure 2 BB cross-section diagram,

[0020] Figure 4 This is a cross-sectional schematic diagram of the upper plug and the ball inserted into the nut of the second embodiment of the utility model.

[0021] Figure 5 Example 2 Figure 4 Schematic diagram of CC cross section,

[0022] Figure 6 This is a bottom view of the upper plug of the utility model.

[0023] Figure 7 This is a top view of the lower plug of the utility model.

[0024] Figure 8 This is a cross-sectional schematic diagram of the upper plug and the ball inserted into the nut of Example 3 of the utility model.

[0025] Fig. 9 Example 3 Figure 8 Schematic diagram of DD cross section.

[0026] Description of Figure Numbers

[0027] Nut 1, accommodating groove 101, internal thread 102, ball groove 2, ball 3, upper plug 4, cylindrical plug body 401, card 402, side edge 403, lower plug 5, annular cover body 501, limiting column 502, positioning column 503. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0029] See also Figure 1-9 As shown, the specific implementation of the utility model is as follows: a combined anti-loosening nut includes a nut 1, and an internal thread 102 matching with a screw rod is provided in the nut;

[0030] An open ball groove 2 is provided at the threaded part of the nut hole, which penetrates into the threaded part and the nut wall, and a ball 3 is installed in the ball groove 2, and the ball 3 and the ball groove 2 are in rolling cooperation; a nut inner plug is provided, and the inner plug is inserted into the hole from one end of the inner hole of the nut to limit and fix the ball;

[0031] The screw is screwed into the nut from the end without the inner plug, and after pressing the ball, the screw is screwed out of the other end of the nut, and the inner plug is pushed out or retained in the nut;

[0032] The ball groove is an arc-shaped groove opened along the thread rotation direction or along the circumferential direction, and at least one pair is symmetrically arranged. The arc-shaped groove gradually deepens along the direction of thread tightening, and the length of the arc-shaped groove along the circumference does not exceed 2.5 times the diameter of the ball;

[0033] The diameter of the ball is not greater than 1.2 times the pitch, and the depth of the arc-shaped groove at the deepest radial position is set in such a way that 1 / 3 of the diameter of the ball is placed in the nut thread, and the remaining part of the ball is inside the nut side wall behind the nut thread; the arc-shaped groove is set at the thread groove between two threads, and the ball and the arc-shaped groove are in rolling cooperation. Alternatively, the proportion of the part of the ball placed in the nut thread can be adjusted according to the hardness of the ball material used, which can be slightly smaller or slightly larger than the 1 / 3 diameter part.

[0034] In the combined anti-loosening nut, the ball is a spherical ball or a cylindrical roller.

[0035] In the combined anti-loosening nut, the ball is a flexible ball.

[0036] In the combined anti-loosening nut, the flexible ball is an aluminum alloy ball.

[0037] The ball groove 2 can accommodate the deformation of the ball without hindering the free rolling of the ball;

[0038] Embodiment 1,

[0039] See also Figure 1-3 As shown in , 7, the described combined anti-loosening nut is based on the aforementioned embodiment and further exemplified as follows: the inner plug is a lower plug 5, and the lower plug is composed of four columns arranged on an annular cover body 501, wherein a pair of symmetrical columns are limiting columns 502, and the other pair of symmetrical columns are positioning columns 503, the limiting columns 502 are inclined columns with an arc-shaped surface at the upper end, and the nut is provided with a receiving groove 101 on the internal thread corresponding to the column, and the limiting column and the positioning column are embedded in their respective receiving grooves, the limiting column 502 extends into the ball groove 2 and its arc-shaped surface buckles the ball to limit, the annular cover body 501 is clamped on the outer end surface of the lower end of the nut to limit, the screw rod passes through the circular hole of the annular cover body 501 of the lower plug 5 from the lower end and is screwed into the nut, and the limiting column and the ball are pressed and then the other end of the nut is screwed out, the screw rod and the ball are tightly matched, and the lower plug is a plastic plug; the arc length of the arc surface is not greater than 1 / 2 of the diameter of the ball.

[0040] Embodiment 2,

[0041] See also Figure 4-6As shown, the described combined anti-loosening nut is based on the aforementioned embodiment and further exemplified as follows: the inner plug is an upper plug 4, the upper plug is provided with a cylindrical plug body 401, and a flange-type annular edge extending outward is provided at its upper end, a card 402 extending outward is provided on the outer edge of the cylindrical plug body 401, a plurality of vertical side edges 403 protruding from the cylindrical surface are provided on the cylindrical surface of the cylindrical plug body 401, and the bottom of the cylindrical plug body 401 is recessed upward to form the bottom edge of the circular ring; the upper plug 4 is inserted into the nut hole from the upper end of the nut, the flange-type annular edge at the upper end is clamped at the outer upper end of the nut to limit the position, the card 402 is clamped in the ball groove 2 to limit the ball, and the side edge 403 is pressed and clamped on the inner thread of the nut; the screw is screwed into the nut from the lower end without the inner plug, and after pressing the ball, the other end of the nut is screwed out, and the upper plug 4 is pushed out of the nut at the same time; the screw and the ball are tightly matched, and the upper plug is a plastic plug.

[0042] Embodiment 3,

[0043] See also Figure 8-9 As shown, the described combined anti-loosening nut is based on the aforementioned embodiment 2. As a further example, the difference between this nut and embodiment 2 is that the nut is not provided with a receiving groove 101, and the rest is the same as embodiment 2 and will not be repeated.

[0044] The working principle of this utility model:

[0045] When installing the nut on the screw, insert the screw into the nut from the end without the plug, and tighten it until the screw extends out of the nut. If it is an upper plug 4, it will be pushed out. If it is a lower plug 5, tighten it together and keep it in the nut hole. The lower plug is made of plastic and can be deformed without affecting the screwing in of the screw. Since the screw and the ball are set to be tightly matched, when the screw is screwed into the nut, the ball is a flexible ball with a lower hardness than the screw and the nut. The extrusion amount is preset to be 1 / 3 of the ball diameter. The screw is squeezed and deformed when it is screwed in, and the screw will be smoothly screwed into the nut.

[0046] When the screw and nut become loose, the ball will roll in the ball groove 2. Since the ball groove is an arc-shaped sloped groove, its depth gradually increases along the tightening direction. As the screw and the nut rotate relative to each other, the ball will roll from the deep groove to the shallow groove, and the pressure exerted by the ball on the screw will gradually increase until the screw and nut are locked to the maximum pressure and friction is generated to prevent the screw from loosening due to rotation, thereby preventing the nut from loosening.

[0047] When the nut needs to be disassembled, you can use an ordinary wrench to add a certain amount of turning torque. The ball will deform and the nut can be easily unscrewed. The threads of the nut and bolt will not be damaged and can be reused.

[0048] The utility model has been tested by the quality supervision and testing center for universal parts of the machinery industry, and it has been verified that the utility model has an anti-loosening effect.

Claims

1. A combined anti-loosening nut, comprising a nut, wherein the nut is provided with an internal thread matched with a screw rod; characterized in that: An open ball groove is provided in the threaded part of the nut hole, which is deep into the threaded part and deep into the nut wall, and a ball is installed in the ball groove, and the ball and the ball groove are in rolling cooperation; a nut inner plug is provided, and the inner plug is inserted into the hole from one end of the inner hole of the nut to limit and fix the ball; The screw is screwed into the nut from the end without the inner plug, and after pressing the ball, the screw is screwed out of the other end of the nut, and the inner plug is pushed out or retained in the nut; The ball groove is an arc-shaped groove opened along the thread rotation direction or along the circumferential direction, and at least one pair is symmetrically arranged. The arc-shaped groove gradually deepens along the direction of thread tightening, and the length of the arc-shaped groove along the circumference does not exceed 2.5 times the diameter of the ball; The diameter of the ball is not greater than 1.2 times the pitch, and the depth of the arcuate groove at the deepest radial part is set in such a way that 1 / 3 of the diameter of the placed ball is in the nut thread and the remaining part of the ball is inside the nut side wall behind the nut thread; the arcuate groove is set at the thread groove between two threads, and the ball rolls in cooperation with the arcuate groove.

2. A combined anti-loosening nut according to claim 1, characterized in that: The inner plug is an upper plug, and the upper plug is provided with a cylindrical plug body and a flange-like annular edge extending outward at its upper end. A card extending outward is provided on the outer edge of the cylindrical plug body. A plurality of vertical side edges protruding from the cylindrical surface are provided on the cylindrical surface of the cylindrical plug body, and the bottom of the cylindrical plug body is recessed upward to form a circular bottom edge; the upper plug is inserted into the nut hole from the upper end of the nut, and the flange-like annular edge at the upper end is clamped at the outer upper end of the nut to limit the position, the card is clamped in the ball groove to limit the ball, and the side edges are pressed and clamped on the inner thread of the nut; the screw is screwed into the nut from the lower end without the inner plug, and after pressing the ball, the other end of the nut is screwed out, and the upper plug is pushed out of the nut at the same time; the screw and the ball are tightly matched, and the upper plug is a plastic plug.

3. A combined anti-loosening nut according to claim 1, characterized in that: The inner plug is a lower plug, and the lower plug is composed of four columns arranged on an annular cover body, wherein a pair of symmetrical columns are limit columns, and the other pair of symmetrical columns are positioning columns. The limit columns are inclined columns with an arc-shaped surface at the upper end. The nut is provided with an accommodating groove on the internal thread corresponding to the column, and the limit column and the positioning column are embedded in their respective accommodating grooves. The limit column extends into the ball groove and its arc-shaped surface buckles the ball to limit the position. The annular cover body is clamped on the outer end surface of the lower end of the nut to limit the position. The screw passes through the circular hole of the annular cover body of the lower plug from the lower end and is screwed into the nut. After tightening the limit column and the ball, the other end of the nut is screwed out. The screw and the ball are tightly matched, and the lower plug is a plastic plug; the arc length of the arc surface is not greater than 1 / 2 of the diameter of the ball.

4. A combined anti-loosening nut according to claim 1, characterized in that: The balls are spherical balls or cylindrical rollers.

5. The combined anti-loosening nut according to claim 1, characterized in that: The ball is a flexible ball.

6. A combined anti-loosening nut according to claim 5, characterized in that: The flexible ball is an aluminum alloy ball.

Images