Anti-loosening nut assembly, anti-loosening system and fastening method thereof

Abstract

The present invention provides a locking nut assembly, comprising a fixing nut, a fastening nut, and a synchronous sleeve sleeved over the fixing nut and the fastening nut to cause them to rotate synchronously. The fixing nut and the fastening nut are provided with internal threads with opposite spiral directions. The synchronous sleeve is provided with a regular hexagonal through hole along its axial direction. The through hole is clearance-matched with the fixing nut and the fastening nut, and the clearance is zero. The fastening nut is provided with at least one positioning hole, and the synchronous sleeve is provided with at least one positioning strip corresponding to the position of the positioning hole. The present invention can effectively improve the connection and tightening of the fixing nut, the fastening nut, and the double-pressure screw, and can prevent loosening even under strong vibration conditions.

Description

Technical Field

[0001] The present invention relates to the field of anti-loosening nuts and fastening technology, and in particular to an anti-loosening nut assembly, an anti-loosening system comprising the anti-loosening nut assembly, and a fastening method for the anti-loosening system. Background Art

[0002] The double-thread screw is provided with two threads with opposite spiral directions. The anti-loosening effect is improved by connecting two nuts to the double-thread screw. The two nuts are provided with opposite internal threads and respectively cooperate with the positive and negative threads of the double-thread screw. Since the two nuts will produce displacements in different directions when rotating, loosening is reduced. However, this structure is used in a long-term vibration environment. During the vibration process, the nut on the outer side will gradually loosen under the action of vibration because it is not blocked or limited by other factors. When the nut on the outer side is loosened, the nut on the inner side will still gradually loosen under the action of vibration, resulting in poor stability. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides an anti-loosening nut assembly, an anti-loosening system and a fastening method thereof, which can effectively prevent two nuts from loosening one after another and ensure their stability.

[0004] According to an embodiment of the present invention, a locking nut assembly is provided, comprising a fixing nut, a fastening nut, and a synchronous sleeve which is sleeved on the fixing nut and the fastening nut and causes them to rotate synchronously, the fixing nut and the fastening nut being provided with internal threads with opposite spiral directions, the synchronous sleeve being provided with a regular hexagonal through hole along its axial direction, the through hole being clearance-matched with the fixing nut and the fastening nut and the clearance being zero, the fastening nut being provided with at least one positioning hole, and the synchronous sleeve being provided with at least one positioning strip corresponding to the position of the positioning hole.

[0005] Preferably, the fixing nut is provided with at least one positioning groove evenly distributed along its circumference on the end face close to the fastening nut, the fastening nut is provided with at least one positioning protrusion on the end face close to the fixing nut, and the lower part of the side wall of the through hole is provided with a limiting groove that cooperates with the edge of the fixing nut.

[0006] Further preferably, the positioning groove is a long strip groove arranged along the radial direction of the fastening nut, and the cross section of the positioning groove perpendicular to its length direction is an arc surface.

[0007] Further preferably, there are 12 positioning grooves, and there are 3 positioning protrusions that are evenly distributed along the circumference.

[0008] Further preferably, a limiting groove is provided at the lower portion of each side wall of the through hole, and the limiting groove is located at the vertical center line of the side wall of the through hole.

[0009] Preferably, the length of the synchronization sleeve is greater than the length of the fixing nut, and less than the sum of the lengths of the fixing nut and the fastening nut.

[0010] Further preferably, the positioning hole is provided on a side wall of the fastening nut, and the positioning strip is provided at an end portion of the synchronization sleeve close to the fastening nut.

[0011] Further preferably, there are three positioning holes and they are evenly distributed along the circumference of the fastening nut, the three positioning holes are respectively located on the vertical center lines of the three side walls of the fastening nut, and there are six positioning strips and they are respectively located on the vertical center lines of the six side walls of the through hole.

[0012] According to an embodiment of the present invention, an anti-loosening system is also provided, comprising any one of the above-mentioned anti-loosening nut assemblies and a double-thread screw, wherein the double-thread screw is provided with positive and negative external threads, the fixing nut and the fastening nut are connected to the double-thread screw and respectively cooperate with the positive and negative external threads thereof, and when the fixing nut and the fastening nut rotate in the same direction, they produce a movement tendency towards each other or away from each other.

[0013] According to an embodiment of the present invention, a fastening method applicable to the above-mentioned anti-loosening system is also provided;

[0014] The fixing nut cooperates with the double-thread screw, and the fixing nut is rotated and screwed in until the fixing nut contacts the fastener to be fastened of the double-pressure screw;

[0015] The fastening nut is matched with the double-thread screw, and the fastening nut is screwed in the opposite direction to the fixing nut until the fastening nut contacts the fixing nut;

[0016] Sleeve the synchronization sleeve onto the fixing nut and the fastening nut;

[0017] Bend the positioning strip into the positioning hole.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By providing a synchronization sleeve, the rotational movement of the fixing nut and the fastening nut is restricted, so that the fixing nut and the fastening nut can only rotate synchronously and cannot rotate in opposite directions. When rotating synchronously, the fixing nut and the fastening nut can only move toward each other or away from each other. In both movement trends, the fixing nut and the fastening nut cannot move away from the fastener to be fastened, thereby ensuring the stability of the connection;

[0020] 2. By setting the positioning strips and positioning holes, the synchronous sleeve cannot produce axial displacement. After the installation is completed, the synchronous sleeve will not separate from the fixing nut and the fastening nut, thereby ensuring that the synchronous sleeve can always have a restrictive effect on the fixing nut and the fastening nut, thereby ensuring the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of an anti-loosening system of the present invention.

[0022] Figure 2 This is a schematic structural diagram of a synchronization sleeve in a locking nut assembly of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of a fastening nut in a locking nut assembly of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of a fixing nut in a locking nut assembly of the present invention;

[0025] Figure 5 This is a structural schematic diagram of a locking nut assembly of the present invention when mated;

[0026] In the above drawings: 1. fixing nut; 2. fastening nut; 3. synchronization sleeve; 4. positioning strip; 5. positioning groove; 6. positioning protrusion; 7. through hole; 8. limiting groove; 9. positioning hole; 10. double-thread screw. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0028] Example 1:

[0029] like Figure 1 , as shown, an anti-loosening system includes a anti-loosening nut assembly and a double-thread screw 10, the double-thread screw 10 is provided with positive and negative external threads, wherein the anti-loosening nut assembly includes a fixing nut 1, a fastening nut 2, and a synchronous sleeve 3 which is sleeved on the fixing nut 1 and the fastening nut 2 and makes them rotate synchronously, the fixing nut 1 and the fastening nut 2 are the same size, the fixing nut 1 and the fastening nut 2 are provided with internal threads with opposite spiral directions, the synchronous sleeve 3 is provided with a regular hexagonal through hole 7 along its axial direction, the through hole 7 can be clearance-matched with the fixing nut 1 and the fastening nut 2 and the fitting clearance is zero, the fastening nut 2 is provided with at least one positioning hole 9, the synchronous sleeve 3 is provided with at least one positioning strip 4 corresponding to the position of the positioning hole 9, the fixing nut 1 and the fastening nut 2 are connected to the double-thread screw 10 and respectively cooperate with its positive and negative external threads, and the fixing nut 1 and the fastening nut 2 have a movement tendency towards each other or away from each other when they rotate in the same direction;

[0030] When in use, firstly, the fixing nut 1 is matched with the double-thread screw 10, and the fixing nut 1 is rotated and screwed in until the fixing nut 1 and the fastener to be fastened of the double-thread screw 10 are in conflict;

[0031] Then, the fastening nut 2 is matched with the double-thread screw 10, and the fastening nut 2 is screwed in in the opposite direction to the fixing nut 1 until the fastening nut 2 contacts the fixing nut 1;

[0032] Then, insert the synchronization sleeve 3 onto the fixing nut 1 and the fastening nut 2;

[0033] Finally, use a tool to bend the positioning strip 4 into the positioning hole 9. Under the action of the positioning strip 4 and the positioning hole 9, the synchronous sleeve 3 will not produce axial movement. Therefore, even if it is tilted and inverted, the synchronous sleeve 3 will not separate from the fixing nut 1 and the fastening nut 2.

[0034] When disassembling, use tools to break out the positioning strip 4;

[0035] After installation, the fixing nut 1 and the fastening nut 2 can only generate synchronous rotational motion in the same direction under the action of the synchronization sleeve 3. Moreover, since the fixing nut 1 and the fastening nut 2 cooperate with the double-thread screw 10, the fixing nut 1 and the fastening nut 2 have a tendency to move toward each other or away from each other when rotating in the same direction.

[0036] When the fixing nut 1 and the fastening nut 2 have a tendency to move away from each other, the fixing nut 1 is in conflict with the fastener and cannot generate axial displacement toward the fastener, and thus cannot generate rotational motion. Under the restraining effect of the synchronizing sleeve 3, the fastening nut 2 is also unable to generate rotational motion, so the fastening nut 2 will not generate axial displacement away from the fixing nut 1, thereby causing loosening.

[0037] When the fixing nut 1 and the fastening nut 2 have a tendency to move toward each other, since the fastening nut 2 is in a tendency to axially displace toward the fixing nut 1, and the fixing nut 1 is in a tendency to axially displace toward the fastening nut 2, the fixing nut 1 and the fastening nut 2 restrict each other, so that neither the fixing nut 1 nor the fastening nut 2 can produce axial displacement, so the fixing nut 1 cannot move away from the fastener to be fastened, and thus will not loosen;

[0038] like Figure 3 、 Figure 4As shown, in order to facilitate the synchronization sleeve 3 to be inserted into the fixing nut 1 and the fastening nut 2 when the edges of the fixing nut 1 and the fastening nut 2 are staggered, the end surface of the fixing nut 1 close to the fastening nut 2 is provided with at least 12 positioning grooves 5 evenly distributed along its circumference, the end surface of the fastening nut 2 close to the fixing nut 1 is provided with at least one positioning protrusion 6, and the lower portion of the side wall of the through hole 7 is provided with a limiting groove 8 that cooperates with the edge of the fixing nut 1;

[0039] The positioning protrusion 6 only needs to rotate from one positioning groove 5 to another adjacent positioning groove 5 by an angle of less than 30°. Since the threads of the double-thread screw 10 can produce a certain range of deformation without being damaged, even when the fixing nut 1 and the fastening nut 2 conflict with each other, the positioning protrusion 6 is located between the two positioning grooves 5. The fastening nut 2 can still be screwed on to make the positioning protrusion 6 enter the positioning groove 5, so that the limiting groove 8 can cooperate with the edge of the fixing nut 1, making it easier for the synchronizing sleeve 3 to be inserted into the fastening nut 2 and the fixing nut 1.

[0040] In order to facilitate the positioning protrusion 6 to smoothly enter the positioning groove 5, as shown in FIG. Figure 4 As shown, the positioning groove 5 is a long strip groove arranged along the radial direction of the fastening nut 2, and the cross section of the positioning groove 5 perpendicular to its length direction is an arc surface.

[0041] Example 2:

[0042] Under the premise of being conducive to processing and facilitating adjustment of the fastening nut 2, on the basis of Example 1, the positioning grooves 5 are provided with 12, the positioning protrusions 6 are provided with 3 and are evenly distributed along the circumference thereof, the positioning grooves 5 and the positioning protrusions 6 are respectively arranged on the vertical center lines of the sides of the fixing nut 1 and the fastening nut 2, and the lower part of each side wall of the through hole 7 is provided with a limiting groove 8, and the limiting groove 8 is located at the vertical center line position of the side wall of the through hole 7;

[0043] like Figure 5 As shown, in order to facilitate the processing of the positioning strip 4 and to facilitate the positioning strip 4 to enter the positioning hole 9, the length of the synchronization sleeve 3 is greater than the length of the fixing nut 1 and less than the sum of the lengths of the fixing nut 1 and the fastening nut 2; the positioning hole 9 is provided on the side wall of the fastening nut 2, and the positioning strip 4 is provided at the end of the synchronization sleeve 3 close to the fastening nut 2;

[0044] When the synchronization sleeve 3 is installed, the end without the positioning strip 4 contacts the fastener to be fastened, and the height of the positioning strip 4 is just consistent with the positioning hole 9;

[0045] Specifically, there are three positioning holes 9 and they are evenly distributed along the circumference of the fastening nut 2. The three positioning holes 9 are respectively located on the vertical center lines of the three side walls of the fastening nut 2. There are six positioning bars 4 and they are respectively located on the vertical center lines of the six side walls of the through hole 7.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A locking nut assembly, characterized in that: The invention comprises a fixing nut (1), a fastening nut (2), and a synchronous sleeve (3) which is sleeved on the fixing nut (1) and the fastening nut (2) and causes them to rotate synchronously, wherein the fixing nut (1) and the fastening nut (2) are provided with internal threads with opposite spiral directions, the synchronous sleeve (3) is provided with a regular hexagonal through hole (7) along its axial direction, the through hole (7) and the fixing nut (1) and the fastening nut (2) are clearance-matched and the clearance is zero, the fastening nut (2) is provided with a positioning hole (9), the synchronous sleeve (3) is provided with a positioning strip (4) corresponding to the position of the positioning hole (9), three positioning holes (9) are provided and are evenly distributed along the circumference of the fastening nut (2), the three positioning holes (9) are respectively located on the vertical center lines of the three side walls of the fastening nut (2), and the positioning strip (4) is arranged on the synchronous sleeve ( 3) close to the end of the fastening nut (2), and the positioning strips (4) are provided with six and respectively located on the vertical center lines of the six side walls of the through hole (7), the fixing nut (1) is provided with 12 positioning grooves (5) uniformly distributed along its circumference on the end face close to the fastening nut (2), the fastening nut (2) is provided with a positioning protrusion (6) on the end face close to the fixing nut (1), the positioning protrusion (6) is arranged on the vertical center line of the side of the fastening nut (2), the positioning protrusion (6) is provided with three and uniformly distributed along its circumference, the positioning protrusion (6) can be rotated from one positioning groove (5) to another adjacent positioning groove (5), each side wall of the through hole (7) is provided with a limiting groove (8) cooperating with the edge of the fixing nut (1), and the limiting groove (8) is located at the vertical center line position of the side wall of the through hole (7).

2. The anti-loosening nut assembly according to claim 1, characterized in that: The positioning groove (5) is a long strip groove arranged along the radial direction of the fastening nut (2), and the cross section of the positioning groove (5) perpendicular to its length direction is an arc surface.

3. The anti-loosening nut assembly according to claim 1, characterized in that: The length of the synchronization sleeve (3) is greater than the length of the fixing nut (1) and less than the sum of the lengths of the fixing nut (1) and the fastening nut (2).

4. An anti-loosening system, characterized in that: The invention comprises a locking nut assembly according to any one of claims 1 to 3, and a double-thread screw (10), wherein the double-thread screw (10) is provided with positive and negative external threads, the fixing nut (1) and the fastening nut (2) respectively cooperate with the positive and negative external threads of the double-thread screw (10), and when the fixing nut (1) and the fastening nut (2) rotate in the same direction, they have a movement tendency of approaching toward each other or moving away from each other.

5. A method for fastening an anti-loosening system according to claim 4, characterized in that: First, the fixing nut (1) is matched with the double-thread screw (10), and the fixing nut (1) is rotated and screwed in until the fixing nut (1) and the fastener to be fastened of the double-thread screw (10) are in conflict; Then, the fastening nut (2) is matched with the double-thread screw (10), and the fastening nut (2) is screwed in in the opposite direction to the fixing nut (1) until the fastening nut (2) contacts the fixing nut (1); Then, the synchronization sleeve (3) is inserted into the fixing nut (1) and the fastening nut (2); Finally, a tool is used to bend the positioning strip (4) into the positioning hole (9).

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