Locking-mode-selectable lock bolt and nut device

Abstract

A locking-mode-selectable lock bolt and nut device comprises a bolt and a nut, the main fastening nut is arranged on the bolt in a sleeving manner; the fixed locknut is arranged on the bolt in a sleeving manner and is positioned above the main fastening nut; wherein a bolt locking groove is formed in the outer wall of one side of the bolt in the length direction, the section of the bolt locking groove is triangular, an acute angle is formed by two side faces in the bolt locking groove, one side face is arranged in the radial direction of the bolt, and the other side face is an inclined face; mounting through holes are symmetrically formed in two opposite surfaces of the fixed locknut, and a screw hole, a round hole and a square hole are sequentially formed in each mounting through hole from outside to inside; the inner diameter of the round hole is larger than that of the screw hole, and the width of the square hole is smaller than that of the round hole. And the two locking assemblies are respectively inserted into the two mounting through holes of the fixed locknut.

Description

Technical Field

[0001] This utility model relates to the field of bolt connection technology, and specifically to a bolt and nut device with optional locking method to prevent loosening. Background Technology

[0002] When bolts and nuts are connected, a double-nut structure is often used for fastening in situations with minimal vibration; this is also known as a counter-nut anti-loosening method. Once the two counter-nuts are tightened, there is always an interactive pressure between them. For either nut to rotate, it must overcome the friction between the engaged threads. Even if the external load changes, if specialized technical measures are used to ensure the upper nut does not loosen, the pressure between the counter-nuts remains constant, thus preventing loosening.

[0003] In existing double-nut anti-loosening technology, under conditions of significant vibration, the anti-loosening nut usually loosens first, followed by the main fastening nut, ultimately leading to connection failure. Summary of the Invention

[0004] The purpose of this invention is to design an anti-loosening bolt and nut device with optional locking method, which effectively prevents the fastening bolt from loosening, has a good anti-loosening effect, and can be widely used in the connection of equipment with large vibration.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An optional locking mechanism for preventing loosening of bolts and nuts includes,

[0007] Bolts can be inserted into two connecting plates;

[0008] The main fastening nut is fitted onto the bolt;

[0009] A locking nut is fitted onto the bolt and positioned above the main fastening nut; wherein,

[0010] The bolt has a bolt locking groove on one side of its outer wall along its length. The length of the bolt locking groove is less than the thickness of the two connecting plates plus the thickness of the main fastening nut. The cross-section of the bolt locking groove is triangular, and the two sides inside the bolt locking groove form an acute angle. One side is set along the radial direction of the bolt, and the other side is an inclined surface.

[0011] The fixing anti-loosening nut has two symmetrical mounting through holes on its opposite sides. The mounting through holes are provided with a screw hole, a round hole and a square hole from the outside to the inside. The inner diameter of the round hole is larger than the inner diameter of the screw hole, and the width of the square hole is smaller than the inner diameter of the round hole.

[0012] Two locking components are respectively inserted into the two mounting through holes of the fixing anti-loosening nut; the locking components include...

[0013] A one-way locking pin has a triangular body at the front that matches the bolt locking groove, a cube or cuboid in the middle that matches the square hole, and a first short shaft protruding from the center of the rear end face of the cube or cuboid.

[0014] The locking pin screw has an outer diameter that matches the screw hole. A second short shaft protrudes from the center of the front end face of the locking pin screw. The second short shaft is positioned opposite to the first short shaft and maintains a gap.

[0015] The spring is fitted onto the first short shaft and the second short shaft.

[0016] Preferably, the gap between the second short shaft and the first short shaft is greater than the depth of the bolt locking groove of the bolt, and also greater than the external thread length of the locking pin screw.

[0017] Preferably, the internal thread length of the screw hole in the mounting through hole of the fixing anti-loosening nut is less than or equal to the external thread length of the locking pin screw in the locking assembly.

[0018] In the optional locking method anti-loosening bolt and nut device described in this utility model,

[0019] The locking assembly includes a one-way locking pin, a spring, and a locking pin screw. Installed on a locking nut, the one-way locking pin is first installed in the square hole with its bevel facing the locking nut. Then, the spring is installed on the rear boss of the one-way locking pin. Finally, the locking pin screw is screwed into the threaded part of the locking nut, with the first short axis of the locking pin screw embedded in the spring. The locking pin screw is screwed into the locking nut thread until its outer surface is flush with the outer surface of the locking nut. The distance between the first and second short axes of the one-way locking pin and the locking pin screw is designed to be greater than the depth of the bolt locking groove on the bolt, and also greater than the set thread length of the locking pin screw. The locking pin screw has a dedicated Phillips head groove for screwdrivers.

[0020] The lockable variable thread anti-loosening bolt and nut device of this utility model is characterized by the position of the locking pin screw as a selection of the nut locking method. In the first locking method, when the locking pin screw is flush with the fixed anti-loosening nut, the spring pushes the one-way locking pin into the bolt locking groove on the bolt. The fixed anti-loosening nut can still be rotated clockwise normally, but cannot be tightened in the reverse direction. During normal use, the bolt and anti-loosening nut are locked after the one-way locking pin enters the bolt locking groove and is tightened. If the locking pin screw is removed at this point, the spring and one-way locking pin of the locking system can also be removed, allowing the fixed anti-loosening nut and main fastening nut to be removed. In the second locking method, after the fixed anti-loosening nut is tightened, the one-way locking pin continues to be screwed into the bolt locking groove until it is completely unscrewed from the fixed anti-loosening nut thread. At this point, the locking pin screw cannot be removed, and the one-way locking pin is permanently fixed in the bolt locking groove, permanently locking the bolt and anti-loosening nut. This invention can effectively prevent bolts from loosening, has a good anti-loosening effect, and can be widely used in the connection of equipment with large vibrations.

[0021] Compared with the prior art, the advantages of this utility model are:

[0022] This utility model uses the change of the thread position of the threaded pin and the one-way locking pin of the locking system to be embedded in the bolt locking groove of the bolt to fix the anti-loosening nut, so that the anti-loosening nut and the bolt achieve an anti-loosening structure; at the same time, the anti-loosening nut is fixed in position by screwing the locking pin screw into the fixed anti-loosening nut, so that the fixed anti-loosening nut is in a locked state, a disassembled state, and a permanently locked state.

[0023] This utility model has a simple structure, effectively prevents the fastening bolts from loosening, has a good anti-loosening effect, and has low manufacturing cost. It can be widely used for connecting equipment with large vibrations. Attached Figure Description

[0024] Figure 1 This is a front view of an embodiment of the present utility model;

[0025] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0026] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0027] Figure 4 This is a schematic diagram of the bolt structure in an embodiment of this utility model;

[0028] Figure 5 This is a top view of the bolt in an embodiment of this utility model;

[0029] Figure 6 for Figure 5 AA section view;

[0030] Figure 7 This is a schematic diagram of the structure for fixing the anti-loosening nut in an embodiment of this utility model;

[0031] Figure 8 for Figure 7 BB section view;

[0032] Figure 9 for Figure 7 CC section view;

[0033] Figure 10 This is an enlarged structural schematic diagram of the locking component in an embodiment of this utility model. Detailed Implementation

[0034] See Figures 1-10 The optional locking method anti-loosening bolt and nut device of this utility model includes,

[0035] Bolt 1 can be inserted into the two connecting plates 100;

[0036] Main fastening nut 2 is fitted onto bolt 1;

[0037] The locking nut 3 is fitted onto the bolt 1 and positioned above the main fastening nut 2; wherein,

[0038] The bolt 1 has a bolt locking groove 11 on one side of its outer wall along the length direction. The length L11 of the bolt locking groove 11 is less than the thickness of the two connecting plates 100 plus the thickness of the main fastening nut 2. The cross-section of the bolt locking groove 11 is triangular, and the two sides inside the bolt locking groove 11 form an acute angle. One side is arranged radially along the bolt 1, and the other side is an inclined surface.

[0039] The fixing anti-loosening nut 3 has two opposite faces symmetrically provided with mounting through holes 31 and 31'. The mounting through hole 31 (taking the mounting through hole 31 as an example, the same below) is provided with a screw hole 311, a round hole 312 and a square hole 313 from the outside to the inside; wherein, the inner diameter of the round hole 312 is larger than the inner diameter of the screw hole 311, and the width of the square hole 313 is smaller than the inner diameter of the round hole 312.

[0040] Two locking components 4 and 4' are respectively inserted into the two mounting through holes 31 of the fixing anti-loosening nut 3; the locking component 4 (taking the locking component 4 as an example, the same below) includes,

[0041] The one-way locking pin 41 has a triangular body 411 at the front that matches the bolt locking groove 11, a cube 412 or cuboid at the middle that matches the square hole 313, and a first short shaft 413 protruding from the center of the rear end face of the cube 412 or cuboid.

[0042] The locking pin screw 42 has an outer diameter that matches the screw hole 311. A second short shaft 421 protrudes from the center of the front end face of the locking pin screw 42. The second short shaft 421 is arranged opposite to the first short shaft 413 and maintains a gap H. Preferably, the internal thread length L311 of the screw hole 311 is the same as or less than the external thread length L42 of the locking pin screw 42.

[0043] Spring 43 is sleeved on the first short shaft 413 and the second short shaft 421.

[0044] Preferably, the gap H between the second short shaft 421 and the first short shaft 413 is greater than the depth h of the bolt locking groove 11 of the bolt 1, and is also greater than the external thread length L42 of the locking pin screw 42.

[0045] In use, tighten the main fastening nut 2 and bolt 1 onto the equipment or facility, and after the pre-tightening requirement is met, screw the anti-loosening nut 3 completely into the bolt 1 until one of the locking components 4 holes of the anti-loosening nut 3 overlaps with the bolt locking groove 11. Install the one-way locking pin 41 with its bevel facing the anti-loosening nut 3 into the square hole, and then install the spring on the first short shaft at the rear of the one-way locking pin 41. Finally, screw the locking pin screw 42 into the thread of the anti-loosening nut 3, while the second short shaft of the locking pin screw 42 is embedded in the spring. After the other locking component 4' hole overlaps with the bolt locking groove 11, install another set of locking components 4 as described above. The distance H between the first and second short axes of the one-way locking pin 41 and the locking pin screw 42 is designed to be greater than the depth h of the bolt locking groove 11 opened by the bolt 1. The one-way locking pin 41 ensures that the locking nut 3 is screwed in normally. Continue to screw the locking nut 3 in until the locking nut 3 is tightened in place. The one-way locking pin 41 of one set of locking components 4 is embedded in the bolt locking groove 11. At this time, the locking nut 3 will not rotate due to vibration and external force, ensuring that the bolt and nut are locked.

[0046] To disassemble the bolt and nut mechanism, first unscrew the locking pin screw 42 of the locking assembly 4, then remove the spring 43 and the one-way locking pin 41; then remove the other locking assembly 4. The anti-loosening nut 3 can then be unscrewed, and finally the main fastening nut 2 can be removed.

[0047] If the bolt and nut need to be permanently locked on-site and will not be removed in the future, the locking pin screw 42 of the locking assembly 4 must be screwed in first until the locking pin screw 42 is fully screwed into the internal thread of the locking screw that secures the anti-loosening nut 3. At this point, the locking pin screw 42 cannot be screwed out, and the one-way locking pin 41 is permanently embedded in the bolt locking groove 11 (see...). Figure 3 This prevents the locking nut 3 from rotating, ensuring that the bolt and nut are locked in place.

Claims

1. A bolt and nut anti-loosening device with optional locking method, comprising, Bolts can be inserted into two connecting plates; The main fastening nut is fitted onto the bolt; A locking nut is fitted onto the bolt and positioned above the main fastening nut; its characteristic is that... The bolt has a bolt locking groove on one side of its outer wall along its length. The length of the bolt locking groove is less than the thickness of the two connecting plates plus the thickness of the main fastening nut. The cross-section of the bolt locking groove is triangular, and the two sides inside the bolt locking groove form an acute angle. One side is set along the radial direction of the bolt, and the other side is an inclined surface. The fixing anti-loosening nut has two symmetrical mounting through holes on its opposite sides. The mounting through holes are provided with a screw hole, a round hole and a square hole from the outside to the inside. The inner diameter of the round hole is larger than the inner diameter of the screw hole, and the width of the square hole is smaller than the inner diameter of the round hole. Two locking components are respectively inserted into the two mounting through holes of the fixing anti-loosening nut; the locking components include... A one-way locking pin has a triangular body at the front that matches the bolt locking groove, a cube or cuboid in the middle that matches the square hole, and a first short shaft protruding from the center of the rear end face of the cube or cuboid. The locking pin screw has an outer diameter that matches the screw hole. A second short shaft protrudes from the center of the front end face of the locking pin screw. The second short shaft is positioned opposite to the first short shaft and maintains a gap. The spring is fitted onto the first short shaft and the second short shaft.

2. The optional locking method anti-loosening bolt and nut device as described in claim 1, characterized in that, The gap between the second short shaft and the first short shaft is greater than the depth of the bolt locking groove of the bolt, and also greater than the external thread length of the locking pin screw.

3. The optional locking method anti-loosening bolt and nut device as described in claim 1, characterized in that, The internal thread length of the screw hole in the mounting through hole of the fixed anti-loosening nut is less than or equal to the external thread length of the locking pin screw in the locking assembly.

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