JP6426247B1 - Nut loosening prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut loosening prevention device which has a simple structure, can be manufactured at low cost, and can be easily attached to existing bolts and nuts. SOLUTION: A nut loosening prevention device (1) for preventing a nut screwed into a bolt from loosening is formed in a plate shape by a metal plate, and a bolt (30) is formed on one end side portion of the nut loosening prevention device (1). And an engaging portion (2) that can be engaged from the orthogonal direction orthogonal to the axis, and a gripping portion (3) that can be grasped by hand on the other end side portion, and the engaging portion (2) The U-shaped notch (5) into which the bolt (30) can be introduced, and the screw thread (30a) of the bolt (30) formed at the far end of the peripheral edge of the U-shaped notch (5) The screw valleys (30b) of the bolt (30) are introduced from both sides on both sides parallel to the bolt introduction direction of the contactable abutment part (6) and the peripheral vicinity of the U-shaped notch (5) And a pair of engaging teeth (7, 8) formed so as to be pinchable in a direction perpendicular to the direction and in line contact. [Selected figure] Figure 3

Description

  The present invention relates to a nut looseness prevention device, and more particularly to a nut looseness prevention device formed in a plate shape by a metal plate and having a simple structure and capable of being easily attached to a bolt and a nut in a tightened state.

In the case of bolts and nuts that sandwich and fasten members to each other, it is known that the nuts loose and fall off when vibrational load and vibration repeatedly act on the bolts and nuts, and the following various techniques are adopted as a countermeasure It is done.
[Dual nut]: The technique of putting another nut (double nut) on top of the nut fastened to the bolt is widely adopted, but it is disadvantageous in cost.

  [Lock Nut]: A lock nut of a special structure is also known, but is disadvantageous in cost. [Nut Loosen Locking Device]: Various types of nut looseness locking devices have been proposed, but like the nut, those mounted from above or below (axially parallel) the bolt, and the side of the bolt It can be divided into those mounted from the (axially orthogonal direction).

[Axle parallel mounting type nut loosening prevention device]:
In the open ring-shaped retaining device described in Patent Document 1, a screw thread of one pitch is formed on the inner peripheral portion of the open ring of the outer shape hexagon, and the screw thread of the open ring is screwed into the thread valley portion of the bolt. After being engaged, by forcibly rotating even after contact with the surface of the nut, the helical shape is deformed into a broken state so as to be non-rotatable to prevent the nut from coming off.

  In the open ring-shaped retaining device described in Patent Document 2, a screw thread (a screw thread having a diameter smaller than the diameter of the thread valley portion of a bolt) is formed on the inner peripheral portion of the open ring of the external hexagonal shape. The end portions on both sides of the open portion of the open ring are formed smaller in diameter than the screw portion, and a frictional force is exerted between one thread portion and both end portions to make it non-rotatable to prevent the nut from coming off.

  In the nut locking ring of Patent Document 3, two parallel faces for turning a tool on the outer periphery of a spring washer-like spiral ring are formed, and a triangular tooth closely attached to the screw valley of a bolt on the inner periphery of the spiral ring. And the screw ring is screwed onto the thread valley of the bolt to prevent the nut from being loosened.

[Shaft perpendicular mounting type nut loosening prevention device]:
In Patent Document 4, the clip for preventing nut detachment is formed by bending an elastic metal wire. The clip includes hook-shaped first and second portions extending from the annular portion on both sides, a housing portion capable of receiving a bolt formed between the first and second portions, and the first and second portions. It has the 1st, 2nd tip contact parts etc. which are formed in the tip part and contact the screw part of a bolt.

  In the case of mounting on a bolt, the opening at the tip of the housing is made to approach the bolt, the bolt is introduced into the housing through elastic deformation of the clip, and the first and second tip contact parts are screw valleys of the bolt Engage in Thus, since the clip is engaged with the screw portion, it is possible to prevent the nut from coming off even when the nut is loosened.

JP, 2013-130254, A Japanese Utility Model Application Publication No. 2-69111 Japanese Patent Application Laid-Open No. 55-115613 JP 2011-174600 A

  The retainer of Patent Document 1 is manufactured by punching and forming a metal plate having a thickness of 2 and 3 mm, but the manufacturing cost is high and the screw groove of the bolt is also attached when mounting to a bolt. It takes a long time to mount because it needs to be rotated several times and finally it is necessary to tighten the tool more strongly.

  The retaining tool of Patent Document 2 and the nut locking ring of Patent Document 3 have almost the same problems as the retaining tool of Patent Document 1.

Since the clip for preventing nut detachment in Patent Document 4 is manufactured by bending a metal wire into a complicated shape, special manufacturing equipment is also required, and the manufacturing cost becomes expensive.
Since the first and second tip contact portions are in point contact with the screw valleys of the bolt, the frictional force acting between the clip and the bolt is insufficient, and the clip is entangled when the nut rotates There is a risk that the nut may come off, and it is difficult to strengthen the loosening prevention function of the nut.
SUMMARY OF THE INVENTION An object of the present invention is to provide a nut loosening prevention device which has a simple structure and can be manufactured inexpensively and can be easily attached to existing bolts and nuts.

The nut loosening prevention device according to claim 1 is a nut loosening prevention device for preventing loosening of a nut screwed to a bolt, wherein the nut loosening prevention device is formed of a metal plate in a plate shape, and the nut loosening prevention device The bolt is formed at one end portion thereof with an engaging portion engageable in an orthogonal direction orthogonal to the axis of the bolt, and at the other end portion is formed with a gripping portion which can be gripped by hand; A U-shaped notched portion into which the bolt can be introduced, an abutting portion formed at the far end of the peripheral portion of the U-shaped notched portion and capable of abutting on the screw thread portion of the bolt, and the U-shaped notched portion A pair of engaging teeth formed on both sides parallel to the bolt introducing direction of the peripheral edge portion of the bolt so as to be able to sandwich the screw valleys of the bolt orthogonally to the bolt introducing direction from both sides in linear contact form; comprising, contacting face abutting the nut is formed in one side of the engaging portion, A first bent portion is formed at the boundary between the holding portion and the engaging portion, and the holding portion is bent at an angle of 20 ° to 40 ° at the first bent portion to the opposite side to the contact surface. It is characterized in that it is formed in an inclined shape .

According to the above configuration, the nut loosening prevention device is made to approach the bolt in a direction orthogonal to the axis of the bolt, and the engaging portion is engaged with the bolt to introduce the bolt into the U-shaped notch portion. Engaging teeth are pinched in a thread valley portion of a bolt so as to be orthogonal to and in line contact with the bolt introduction direction.
Thereafter, the nut loosening prevention device is rotated in the right screw direction, and when one engagement tooth of the pair of engagement teeth is engaged between the screw thread portion and the nut, the nut prevents the nut from loosening. It is locked by a tool and it will be in a locking state.

This nut looseness prevention tool can be manufactured easily and inexpensively by punching and forming a metal plate, and even when attached to a bolt or nut, it can be easily operated in a simple operation from the direction perpendicular to the axis of the bolt. It can be worn on
And since the said holding part is bent 20 degrees-40 degrees in the 1st bending part, and is formed in slope shape on the opposite side to a contact surface, a nut looseness prevention from the member fastened with a bolt and a nut is prevented. By securing the distance to the grip portion of the tool, the operability at the time of turning the nut looseness prevention tool can be enhanced.

In the nut looseness prevention device according to claim 2 , in the invention according to claim 1, when introducing the bolt into the U-shaped notch portion, the bolt is inserted into the inlet portion opposite to the back end portion in the U-shaped notch portion. It is characterized in that a pair of inclined guide portions for guiding is formed.
According to the above configuration, the bolt can be smoothly introduced into the U-shaped notch while being guided by the pair of inclined guides.

According to a third aspect of the present invention, there is provided the nut looseness prevention device according to the first aspect, wherein the engagement portion is formed on both sides of the U-shaped notch so as to include the pair of engagement teeth. It has a joint wall part, and it is characterized by having formed a pair of division notch parts which continue in a U-shaped notch part in the bolt introduction direction both sides of the engagement tooth among each engagement wall part.

  According to the above configuration, the parting notch closer to the contact portion causes a failure from the portion where the engagement tooth engages with the thread valley portion to the portion where the contact portion abuts against the thread portion A continuous part can be realized.

In the nut loosening prevention device according to claim 4 , in the invention according to claim 3 , bolts are introduced into a pair of engaging wall portions at a position of the dividing notch portion opposite to the back end portion among the pair of dividing notch portions. direction and a second bent portion perpendicularly of is formed, 3 the front end wall portion of the front end side of the second bent portion of the engaging wall portions of the pair is Te said second bent portion odor 0 It is characterized in that it is bent by 40 to 40 degrees and formed in an inclined shape to the side opposite to the contact surface.

According to the above configuration, when the nut loosening prevention device is engaged with the bolt, the pair of the end wall portions are engaged with the bolt and then the pair of engagement wall portions and the pair of engagement teeth are to engage the bolt. When the tip wall is inclined as described above, when engaging the pair of tip walls with the bolt, the distance from the member fastened by the bolt and the nut to the grip portion of the nut loosening prevention device is By enlarging it, the operability at the time of engaging the nut loosening prevention device with the bolt can be enhanced.

  According to the invention of the present application, various effects as described above can be obtained.

It is a top view of the nut looseness prevention tool concerning Example 1 of the present invention. It is a side view of a nut looseness prevention tool. Enlarged plan view for explaining the nut looseness prevention device (A) is a perspective view of a state where the nut looseness prevention device is mounted on the bolt and the nut, and (b) is a perspective view of a state where the engaging portion of the nut looseness prevention device is engaged with the bolt and the nut; c) is a perspective view of a state in which the nut loosening prevention device is rotated. It is a top view of the nut looseness prevention tool concerning Example 2. FIG.

  Hereinafter, the form for carrying out the present invention is explained based on an example.

The nut looseness prevention device 1 of Example 1 is demonstrated based on FIGS. 1-4.
The nut loosening prevention device 1 is for preventing the loosening of the nut 31 screwed into the bolt 30 and is formed into a plate shape using a plate material of 0.5 mm thickness made of, for example, SUS301. It is formed flat. In addition, this nut looseness prevention tool 1 is formed in the size according to the size of bolt 30, and this example is an example of the nut looseness prevention tool for the bolt of M10, for example.

The nut loosening prevention device 1 has an engaging portion 2 which can be engaged with the bolt 30 from an orthogonal direction orthogonal to the axis at one end side portion, and a gripping portion 3 which can be gripped by hand at the other end side. Have. An abutment surface 2a to be in contact with the nut 31 is formed on one surface (lower surface) of the engagement portion 2, and a first bent portion 4 is formed at the boundary between the grip portion 3 and the engagement portion 2 The portion 3 is bent at an angle α at the first bending portion 4 and is formed to be inclined to the opposite side to the contact surface 2a. The above-mentioned angle α is preferably about 20 ° to 40 °, and most preferably about 30 °.

  The engaging portion 2 is formed on the U-shaped notch 5 into which the bolt 30 can be introduced and at the far end of the peripheral edge of the U-shaped notch 5 and can be in contact with the screw thread 30 a of the bolt 30 Thread valleys 30b of the bolt 30 on both sides parallel to the bolt introducing direction D of the abutting part 6 and the peripheral vicinity of the U-shaped notch 5 are orthogonal to the bolt introducing direction D and in line contact from both sides And a pair of engaging teeth 7 and 8 formed to be able to be held.

  The engaging portion 2 has a pair of engaging wall portions 9 and 10 formed on both sides of the U-shaped notch 5 so as to include a pair of engaging teeth 7 and 8, each engaging wall portion A pair of split notches 11, 12; 13, 14 connected to the U-shaped notch 5 is formed on both sides of the engaging teeth 7, 8 of the 9, 10 in the bolt introduction direction D.

13 and 14 in a position opposite to the rear end 6 of the parting cut-outs 12 and 14 orthogonal to the bolt introduction direction D in the pair of engaging wall parts 9 and 10 The second bent portions 15, 16 are formed, and the first and second distal end wall portions 17, 18 on the tip side of the second bent portions 15, 16 of the pair of engagement wall portions 9, 10 are formed. There are formed in the angle β in the second bent portions 15 and 16 (e.g., 3 0 ° ~40 °) inclined shape is bent to the contact face 2a opposite.
In the case of the present embodiment, the bending angle β1 of the first front end wall portion 17 is set to, for example, 40 °, and the bending angle β2 of the second front end wall portion 18 is set to, for example, 30 °.

As shown in FIG. 3, the distance from the tip of the engagement tooth 7 to the tip of the engagement tooth 8 is set to be approximately equal to the diameter of the thread valley portion 30 b of the bolt 30.
In the case of the nut loosening prevention device 1 of the present embodiment, the engagement teeth 7 and 8 are formed in a rectangular shape elongated in the circumferential direction, and the circumferential width of the engagement teeth 7 and 8 is 3 to 4 mm. The tips 7 and 8 are formed in an arc shape so as to make line contact with the thread valleys 30 b of the bolt 30.

  As shown in FIG. 3, in the state where the nut loosening prevention device 1 is engaged with the bolt 30, the contact portion 6 makes a point contact with the screw thread portion 30a, and the pair of engagement teeth 7, 8 are in the bolt introducing direction. The screw valleys 30b are held in a shape of line contact orthogonal to D and in line contact. In addition, since the clearances 19 and 20 were formed in the both sides of the contact part 6, the nut loosening prevention tool 1 only contacts the bolt 30 in three places of the contact part 6 and a pair of engaging teeth 7 and 8. Therefore, the acting frictional force can be reduced.

  The inner edge of the first tip wall portion 17 is set to correspond approximately to the middle between the thread valley 30b and the thread 30a. The dividing notches 11 and 12; 13 and 14 can be omitted because they are not essential.

Next, the operation and effects of the nut looseness prevention device 1 described above will be described.
When attaching the above-mentioned nut looseness prevention tool 1 to the bolt 30 and the nut 31 in a state where the members 32, 33 are fastened, the engaging portion 2 of the nut looseness prevention tool 1 is engaged with the bolt 30 A bolt 30 is introduced into the notch 5, the abutment 6 is abutted against the thread 30a, and the pair of engagement teeth 7, 8 sandwich the thread valley 30b, and then the nut loosening prevention device 1 is The screwing direction is pivoted to the limit, and one of the pair of engaging teeth 7 and 8 is engaged between the screw thread 30 a and the nut 31.

The mounting method of the above-mentioned nut looseness prevention tool 1 is concretely explained based on FIG.
FIG. 4A shows a state in which the member 32 and the member 33 are fastened by the bolt 30 and the nut 31, and shows a mounting start state in which the nut loosening prevention device 1 is mounted. First, the grip portion 3 of the nut loosening prevention device 1 is gripped by hand, the grip portion 3 is directed to the opposite side to the members 32, 33, and the first and second tip wall portions 17, 18 of the nut loosening prevention device 1 are Insert in the direction of arrow A to engage bolt 30 near the surface of nut 31.

Next, as shown in FIG. 4 (b), while pressing the grip 3 toward the members 32, 33, the nut loosening prevention device 1 is moved in parallel in the direction of the arrow B, and a pair of engaging teeth The screw valley portion 30b is held from both sides by 7 and 8 and the contact portion 6 is brought into contact with the screw thread portion 30a.
Next, as shown in FIG. 4C, the gripping teeth 3 are gripped by hand and the nut loosening prevention device 1 is rotated in the direction of arrow C with sufficient torque to the rotation limit, so that the engaging teeth are engaged. 7 or the engagement tooth 8 is engaged between the screw thread 30a and the nut 31 while being in contact with the screw valley 30b.

  As a result, even if vibration load or vibration acts on the bolt 30 or the nut 31, the nut loosening prevention device 1 frictionally contacts the bolt 30 with the pair of engagement teeth 7 and 8, or the engagement teeth 7 or Since the engagement teeth 8 are engaged between the screw thread 30a and the nut 31 while being in contact with the thread valleys 30b, the nut looseness prevention device 1 can not be rotated. Thus, the nut 31 is prevented from rotating in the loosening direction.

As described above, the nut loosening prevention device 1 can be easily attached to the existing bolt 30 and nut 31 fastening the member 32 and the member 33 from the side perpendicular to the bolt axis by retrofitting. it can.
The nut loosening prevention device 1 is used to lock nuts 31 of bolts 30 and nuts 31 used to fasten members to members in various mechanical devices, various automobiles, vehicles, railway vehicles, various structures, facilities, etc. Can be applied as a means of

  For example, since vibration due to wind pressure acts on the bolt 30 and the nut 31 fixing the solar panel to the mount, it is necessary to prevent the nut 31 from being loosened with respect to the existing solar panel. In such a case, it is necessary to lock the huge number of bolts 30 / nuts 31 as there are four bolts 30 / nuts 31 in each of several hundreds of thousands of solar panels. The nut loosening prevention device 1 is most suitable for the above needs.

The nut loosening prevention device 1 can be easily and inexpensively manufactured by punching and forming a metal plate, and also when attached to the bolt 30 and the nut 31, from the side orthogonal to the axial center of the bolt 30 It can be attached in one touch by the operation.
From the part where the engaging teeth 7 and 8 engage with the thread valley part 30b by the parting cutouts 11 and 13 closer to the contact part 6, the part from the part where the contact part 6 abuts with the thread part 30a A continuous part can be realized.

  In the nut loosening prevention device 1 of the present invention, since the grip portion 3 is formed to be inclined to the opposite side to the contact surface 2 a via the first bending portion 4, the member 32 fastened by the bolt 30 and the nut 31 It is possible to secure an interval from 33 to the grip portion 3 of the nut looseness prevention device 1 and to enhance operability when rotating the nut looseness prevention device 1.

  When the first and second end wall portions 17 and 18 are inclined to the side opposite to the contact surface 2 a, the bolt 30 and the first and second end wall portions 17 and 18 are engaged with the bolt 30. By increasing the distance from the members 32 and 33 fastened by the nut 31 to the grip portion 3, the operability at the time of engaging the nut loosening prevention device 1 with the bolt 30 can be enhanced.

  Further, in the state of FIG. 4C, when trying to rotate the nut looseness prevention device 1 beyond the rotation limit, the inner edge of the first front end wall portion 17 engages with the screw thread portion 30a, In this case, the mounting error of the nut loosening prevention device 1 is less likely to occur.

  In the case of the present embodiment, the bending angle β1 of the first end wall portion 17 is set to, for example, 40 °, and the bending angle β2 of the second end wall portion 18 is set to, for example, 30 °. As shown in a), when the first and second end wall portions 17 and 18 are engaged with the bolt 30, the first and second thread valleys 30a are not separated from each other without separating the screw thread portion 30a of the bolt 30. The two end wall portions 17 and 18 can be engaged. Therefore, when rotating the nut looseness prevention tool 1 like FIG.4 (c), it can be made to rotate smoothly. Moreover, since the first and second end wall portions 17 and 18 elastically engage with the thread valley portion 30b, the nut loosening prevention device is obtained even when the hand is removed from the grip portion 3 in the state of FIG. 4 (a). 1 will never fall.

  It is the nut looseness prevention tool 1 of the present embodiment, and two types of nut looseness prevention tools 1 for M8 and M10 are prepared, and 30,000 and 60000 times with a plurality of load conditions using a predetermined testing machine. As a result of conducting an impact vibration experiment of the above, the nut loosening prevention device 1 of the present invention obtained the same result as the double nut. However, the details of the test method and the details of the test data will not be described in the present specification.

A nut loosening prevention device 1A according to a second embodiment will be described based on FIG.
The nut loosening prevention device 1A is formed of a metal plate in a plate shape.
An engaging portion 2A engageable with the bolt 30 from an orthogonal direction orthogonal to the axis is formed on the bolt 30 at one end side portion of the nut loosening prevention device 1A, and a gripping portion 3A which can be gripped by hand at the other end side Is formed. A first bent portion 4A is formed at the boundary between the engaging portion 2A and the gripping portion 3A, and the gripping portion 3A is formed in the same manner as the gripping portion 3 in an inclined manner.

  The engaging portion 2A is formed at a deep end of a U-shaped notch 5A into which the bolt 30 can be introduced and a peripheral edge of the U-shaped notch 5A and can abut against the screw thread 30a of the bolt 30. Capable of holding thread valleys 30b of the bolt 30 on both sides parallel to the bolt introducing direction in the vicinity of the contact portion 6A and the U-shaped notch 5A in a line contact perpendicular to the bolt introducing direction from both sides A pair of engaging teeth 7A, 8A formed, a pair of engaging walls 9A, 10A formed on both sides of the U-shaped notch 5A, and a tip of the pair of engaging walls 9A, 10A And a pair of tip wall portions 17A, 18A formed on the

  One pair for guiding the bolt 30 when introducing the bolt into the U-shaped notch 5A at the inlet (the inner side of the pair of tip wall portions 17A, 18A) opposite to the deep end in the U-shaped notch 5A The inclined guide portions 21A and 22A are formed. Therefore, the bolt 30 can be smoothly introduced into the U-shaped notch 5A while being guided by the pair of inclined guides 21A and 22A.

  In the nut loosening prevention device 1A, the divided notches 11, 12; 13, 14 and the second bent portions 15, 16 are omitted, but the other configuration is substantially the same as that of the nut loosening prevention device 1 . The operation and effects of the nut loosening prevention device 1A are substantially the same as those of the above-described nut loosening prevention device 1, and thus the description thereof will be omitted.

Next, a modification in which the embodiment is partially changed will be described.
1) In the nut loosening prevention device 1 of the first embodiment, the first bent portion 4 and the second bent portions 15 and 16 may be omitted because they are not essential. Moreover, since the division | segmentation notch parts 11 and 12; 13,14 are not essential, they may be abbreviate | omitted.

2) In the nut loosening prevention device 1A of the second embodiment, the first bent portion 4A may be omitted because it is not essential.
3) In addition, those skilled in the art can implement the embodiment with partial modifications without departing from the spirit of the present invention, and the present invention includes such modifications.

1, 1 A Nut loosening prevention device 2, 2A Engaging portion 2a Abutment surface 3, 3A Gripping portion 4, 4A First bent portion 5, 5A U-shaped notch 6, 6A Contacting portion 7, 8 Engaging tooth 7A , 8A Engaging tooth 9, 10 Engaging wall 9A, 10A Engaging wall 11-14 Divided notch 15, 16 Second bent part 17, 18 Tip wall 17A, 18A Tip wall 21A, 22A Inclined guide Part 30 Bolt 30a Thread 30b Thread valley 31 Nut

Claims (4)

In a nut loosening prevention device which prevents a nut screwed into a bolt from loosening,
The nut loosening prevention device is formed of a metal plate in a plate shape.
While forming an engaging portion which can be engaged with the bolt from an orthogonal direction orthogonal to the axis of the bolt at one end side portion of the nut loosening prevention tool, a handgrip which can be gripped by hand at the other end side is formed.
The engagement portion is
A U-shaped notch into which the bolt can be introduced;
An abutment portion formed at a deep end portion of the peripheral edge portion of the U-shaped notch portion and capable of abutting on a screw thread portion of the bolt;
A pair of screw valleys of the bolt formed on both sides in the vicinity of the periphery of the U-shaped notch in parallel to the bolt introduction direction so as to be orthogonal to the bolt introduction direction and in linear contact form With engaging teeth ,
An abutment surface is formed on one surface of the engagement portion to be in contact with the nut,
A first bent portion is formed at a boundary portion between the grip portion and the engagement portion, and the grip portion is bent at an angle of 20 ° to 40 ° at the first bent portion to be opposite to the contact surface. A nut loosening prevention device characterized in that it is formed in an inclined shape . The inlet portion opposite to the deep end portion of the U-shaped notch portion is provided with a pair of inclined guide portions for guiding the bolt when introducing the bolt into the U-shaped notch portion. The nut looseness prevention tool according to Item 1. The engagement portion has a pair of engagement wall portions formed on both sides of the U-shaped notch so as to include the pair of engagement teeth, and the engagement portion of each engagement wall portion The nut loosening prevention device according to claim 1, characterized in that a pair of divided notches continuous with the U-shaped notched portion are formed on both sides in the bolt introduction direction of the joint tooth . A second bent portion orthogonal to the bolt introduction direction is formed in the pair of engaging wall portions at the position of the dividing notch portion on the opposite side to the back end portion of the pair of dividing notch portions,
The tip end wall portion on the tip end side of the second bending portion of the pair of engaging wall portions is bent by 30 ° to 40 ° at the second bending portion to the opposite side to the contact surface The nut loosening prevention device according to claim 3 , characterized in that it is formed in an inclined shape .