KR102301433B1 - An anti-loosening nut - Google Patents

Abstract

The present invention relates to an anti-loosening nut in which a spring providing an anti-loosening action can be installed at any position in the circumferential direction within a body. The anti-loosening nut comprises: a body having a threaded part forming a female thread; a spring built into the body and forming a part of the female thread; and a ring cap that covers the spring so as not to be separated from the body. An object of the present invention is to provide the anti-loosening nut with improved processability and productivity compared to a conventional anti-loosening nut.

Description

An anti-loosening nut

The present invention relates to an anti-loosening nut, and relates to a nut structure having a built-in anti-loosening function in which a friction force with a bolt is reduced or increased while a diameter is enlarged or reduced depending on a rotation direction and interference with surrounding structures. .

A bolt-nut is a type of fastening element and has the advantage of easy fastening and no deformation of the base material, so it is widely used not only in static structures but also in dynamic mechanical devices.

In bolt-nut coupling, a clamping force is generated by tightening the bolts to the extent that tension is applied to the bolts in a state in which they are engaged with each other with threads. A bolt-nut connection can loosen over time for a number of reasons, one of which is a dynamic load applied periodically or aperiodically. In particular, it is very important to prevent loosening of the bolt-nut coupling because such a dynamic load is inevitably accompanied in a transportation device such as an automobile or a train or a mechanical production facility.

Conventionally, many techniques have been utilized in which various types of functions are added to the nut to prevent loosening of the bolt-nut coupling. One of them is Nylock, which was developed by Windsor in the United States, and a special nylon is inserted inside the nut to prevent loosening. Another one is a hard lock developed in Japan, and by fastening the normal nut and the eccentric nut together, the loosening prevention function is realized by the wedge effect between the two nuts. In addition, technologies such as Viblock developed in France and Nord Lock developed in Sweden are also being used.

In addition, the applicant of the present application has proposed a nut structure having an anti-loosening function in Korean Patent Registration No. 10-2048264. The anti-loosening nut proposed by the applicant of the present application through a registered patent is "a body having a through-hole for fastening with a bolt, and a coil-shaped spring fastened to the bolt together with the body, and the direction in which the bolt is inserted into the body. A screw thread portion positioned at a lower portion, a spring room positioned on the upper portion of the screw thread portion and into which the spring is inserted, is formed, and an anchor bent outward in a radial direction is formed at an upper end of the spring, the anchor of the body The upper end is inserted into the notch formed by indenting in the vertical direction and is supported in the circumferential direction, the spring room has a shape surrounding the outer periphery of the spring, and a lower jaw portion extending radially from the upper end of the screw thread portion; A side wall portion extending upwardly from the lower jaw portion, a side wall extension portion having a diameter larger than that of the side wall portion at the upper end of the side wall portion, and radially extending from the upper end of the side wall extension portion toward the central axis of the body, the spring a stopper that includes an upper jaw that covers the upper periphery, and the lower end of the spring is caught and supported when the bolt is loosened by a rotational force greater than or equal to a predetermined threshold in the spring room; A supporter is formed symmetrically to support the bottom surface of the spring, the stopper and the supporter are formed through forging, and have a shape protruding from the lower jaw portion and the side wall portion, and the anchor is the furnace The distance the lower end of the spring is spaced apart from the stopper in the circumferential direction in the state inserted into the tooth is longer than the length of the anchor. However, since the anti-loosening nut has a structure in which the anchor of the upper end of the spring is fixed to the notch portion, the spring must be installed at a constant position on the body, and accordingly, the position of the screw thread formed in the body must be constant. That is, there is a problem that the position in the circumferential direction at which the spring is installed on the body is always constantly fixed, and accordingly, the formation position of the screw thread must also be constant along the circumferential direction. This limitation increased the difficulty of the tapping process for forming the thread on the body and acted as a factor to decrease productivity.

Korean Patent Registration No. 10-2048264

An object of the present invention is to provide an anti-loosening nut with improved processability and productivity compared to the conventional anti-loosening nut to solve these problems.

In addition, an object of the present invention is to provide an anti-loosening nut having no restriction on a spring installation position in the anti-loosening nut including a spring embedded in the nut body to provide an anti-loosening function.

Another object of the present invention is to provide an anti-loosening nut that can be reused while providing an anti-loosening function.

An anti-loosening nut according to the present invention for achieving this object includes a body having a threaded portion forming a female screw, a spring built into the body and forming a part of the female screw, and a ring cap covering the spring so as not to be separated from the body and the body includes a spring room portion forming a space to receive the spring at the rear of the screw thread portion, the ring cap is coupled to the upper end of the spring room portion, and the spring is located at an arbitrary position in the circumferential direction within the spring room portion can be installed in, and the spring is limited in movement by interference with adjacent structures within the spring room, so that when the nut rotates relative to the bolt to be fastened in the locking direction, the rear end of the spring becomes a fixed end state and the radius When the force is applied in this expanding direction, the frictional force between the bolt and the spring is reduced, and when the nut is rotated in the loosening direction while the bolt is fastened to the bolt, the rear end of the spring is in a fixed end state By maintaining a force in the direction in which the radius of the spring is reduced, the frictional force between the bolt and the spring increases to maintain the anti-loosening action, and when the rear end of the spring is converted to a free end state by a rotational force greater than or equal to a threshold, the spring is the bolt It becomes possible to rotate in the loosening direction with and a lower jaw portion extending radially outward from the upper end of the threaded portion, and a first side wall portion extending upwardly along the axial direction from the outer periphery of the lower jaw portion, an upper end bent portion formed by being bent inwardly in a radial direction from an upper portion of the first sidewall portion, an anchor protruding outwardly toward the first sidewall portion is formed at the rear end of the spring, and an upper portion of the first sidewall portion A plurality of locking grooves are formed in which the anchor is caught and supported when rotating in the locking direction. A plurality of locking projections are formed on the lower portion of the first side wall portion so that the lower end of the spring is hooked and supported when rotating in the release direction.

In addition, the locking groove and the locking jaw are formed by a side wall groove formed by indenting radially outward from the first side wall portion.

In addition, the spring room part includes a middle chin part extending radially outwardly from the upper end of the first side wall part and a second side wall part extending upward in the axial direction from the outer periphery of the middle chin part, and the upper bent part is the second side wall part. It is configured at the upper end of the second side wall portion, and the ring cap is provided in the form of a circular ring on a plate and is supported so as not to flow in the vertical direction by the intermediate jaw portion and the upper bent portion.

In addition, the present invention for achieving the above object is a body having a threaded portion forming a female screw, a spring wound around a bolt that is built into the body and fastened to form a part of the female screw, and a ring cap that covers the spring so as not to be separated from the body. In the anti-loosening nut containing When the spring is rotated relative to the bolt to be fastened in the locking direction, the rear end of the spring becomes a fixed end state and receives a force in the direction in which the radius is expanded to reduce the frictional force between the bolt and the spring, and in a state in which the nut is fastened to the bolt In a state in which a rotational force less than a threshold value is applied when rotating in the loosening direction, the rear end of the spring maintains a fixed end state and receives a force in a direction in which the spring radius is reduced. is maintained, and when the rear end of the spring is converted to a free end state by a rotational force greater than or equal to a critical value, the spring becomes rotatable in the unlocking direction together with the bolt, The front end of the spring becomes a fixed end state and receives a force in a direction in which the radius of the spring expands to reduce the frictional force between the bolt and the spring, the spring is installed on the same axis as the body, and the spring is the It can be installed at any position in the circumferential direction within the spring room, and the loosening prevention nut includes a plurality of locking grooves in which an anchor formed at the rear end of the spring is hooked so that the rear end of the spring becomes a fixed end state when rotating in the locking direction; and a plurality of locking projections caught on the front end of the spring so that the front end of the spring becomes a fixed end state when rotating in the direction, wherein the plurality of locking grooves and the plurality of locking projections are on a side wall portion forming the spring room portion. characterized in that it is formed.

In addition, the plurality of engaging grooves are radially arranged at equal intervals, and the plurality of engaging projections are also radially arranged at equal intervals.

In addition, the locking groove and the locking jaw are characterized in that formed by a side wall groove formed by indenting radially outward from the side wall portion.

In the anti-loosening nut according to the present invention, a plurality of locking grooves that provide an action to prevent loosening by being caught by an anchor of the spring are arranged at equal intervals, and a plurality of engaging jaws to which the lower end of the spring is caught are arranged at equal intervals. There is an advantage in that it can act the same regardless of which position is installed in the circumferential direction within the spring room.

Therefore, as compared to the conventional anti-loosening nut, the machining position is not restricted in the thread tapping process, and thus workability and productivity can be improved.

In addition, in the case of the conventional anti-loosening nut, in order to release the anti-loosening function, a rotational force large enough to damage or deform the anchor must be applied. The anti-loosening nut according to the present invention has the advantage that the spring anchor part is not damaged in spite of the rotational force greater than or equal to the critical value, so that it can be used again after unfastening.

1 is a perspective view showing an anti-loosening nut according to a first embodiment of the present invention;
Figure 2 is a partial cross-sectional view of the anti-loosening nut according to the first embodiment of the present invention from the front.
Figure 3 is an exploded perspective view showing the loosening prevention nut according to the first embodiment of the present invention.
Figure 4 is a partial cross-sectional exploded perspective view of the anti-loosening nut according to the first embodiment of the present invention viewed from the front.
Figure 5 is a view showing the front and bottom of the ring cap constituting the loosening prevention nut according to the first embodiment of the present invention.
6 is a view showing a side cross-section and a planar cross-section of a portion of the body constituting the anti-loosening nut according to the first embodiment of the present invention.
7 is an enlarged view showing an anchor and a ring cap portion in the anti-loosening nut according to the first embodiment of the present invention.
Figure 8 is an enlarged view showing the lower end of the spring and the lower jaw portion in the anti-loosening nut according to the first embodiment of the present invention.
Figure 9 is a perspective view showing a loosening prevention nut according to a second embodiment of the present invention.
Figure 10 is a partial cross-sectional view of the anti-loosening nut according to the second embodiment of the present invention from the front.
11 is an exploded perspective view showing a loosening prevention nut according to a second embodiment of the present invention;
12 is a partial cross-sectional exploded perspective view of the anti-loosening nut according to the second embodiment of the present invention as viewed from the front;
13 is a perspective view showing the bottom surface of the ring cap of the anti-loosening nut according to the second embodiment of the present invention.
14 is a cross-sectional view showing a state in which the anchor of the upper end of the spring is caught on the ring cap in the anti-loosening nut according to the second embodiment of the present invention.
15 is a perspective view showing a loosening prevention nut according to a third embodiment of the present invention.
Figure 16 is a partial cross-sectional view of the anti-loosening nut according to the third embodiment of the present invention from the front.
17 is an exploded perspective view showing a loosening prevention nut according to a third embodiment of the present invention;
18 is a partial cross-sectional exploded perspective view of the anti-loosening nut according to the third embodiment of the present invention as viewed from the front;
Fig. 19 is a plan sectional view showing a portion cut along the line D-D' in Fig. 16;
Fig. 20 is a plan sectional view showing a portion taken along line E-E' in Fig. 16;
21 is a view showing various modifications of the locking jaw portion 121a and the inclined surface portion 121b in the anti-loosening nut according to the first and second embodiments of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings. Various modifications may be made to the embodiments described below by those of ordinary skill in the art to which the present invention pertains. The embodiments described below are not described to limit the present invention to the embodiments. It should be understood that the present invention includes various modifications, substitutions, and equivalents within the scope of the technical spirit understood from the entire specification as well as the following examples.

It should be understood that expressions such as “including”, “consisting of” and “having” that may be used below do not exclude additional components or functions.

The “first…” which may be used hereinafter ”, “Second… Expressions such as ”, “first”, and “second” should not be construed as limiting the order or importance between elements unless explicitly stated.

Expressions such as “coupled” and “connected” that may be used hereinafter should be understood as not only directly coupled or connected, but also other components present or intervening, unless explicitly stated otherwise. do.

In the use of terms hereinafter, it should be understood that a singular expression does not exclude a plural expression unless explicitly stated otherwise.

The anti-loosening nut according to the present invention relates to a fastening element that can be reused after loosening in some cases while having an anti-loosening action in a fastened state with a bolt. Hereinafter, an anti-loosening nut according to preferred embodiments of the present invention will be described in detail with reference to the drawings.

<First embodiment>

1 to 4, the anti-loosening nut 1 (hereinafter, also abbreviated as "nut") according to the first embodiment of the present invention includes a body 10, a spring 20, and a ring cap 30. includes The spring 20 is built into the body 10 , and the ring cap 30 prevents the spring 20 from being separated to the upper part of the body 10 . The anti-loosening nut 1 is placed so that the lower part of the drawing faces the bolt to be fastened.

In the case of a normal right-hand screw, the anti-loosening nut is fastened while rotating in a clockwise direction (W direction in FIG. 1) with respect to the bolt, and is loosened while rotating in a counterclockwise direction (CW direction in FIG. 1). Hereinafter, the rotation in the locking direction refers to a direction in which the bolt and the nut are relatively rotated in the direction in which they are fastened. That is, the direction in which the bolt rotates counterclockwise with respect to the nut or the nut rotates clockwise with respect to the bolt. And the rotation in the loosening direction means the relative rotation direction in the direction in which the bolt and the nut are released. That is, the direction in which the bolt rotates clockwise with respect to the nut or the nut rotates counterclockwise with respect to the bolt. Hereinafter, in the present embodiment, a case of a right-hand screw will be described as an example for convenience, but it goes without saying that the present invention can be equally applied to a case of a left-hand screw. In the following, for convenience of explanation, the direction parallel to the central axis O shown in FIG. 1 is the axial direction, the direction closer or farther from the central axis O is the radial direction, and the central axis O is the rotational axis. is set in the circumferential direction. In addition, for convenience of description, the downward direction in FIG. 1 is referred to as downward or forward in the sense of entering toward the bolt. And the upward direction on the drawing is called upward or backward in the sense of the direction away from the bolt.

The body 10 has an outer peripheral surface in the form of a hexagonal column. A user may use a tool such as a wrench or a spanner to apply force to the outer circumferential surface of the body 10 to rotate the nut 1 to fasten the nut 1 to the bolt, or to loosen the bolt from the bolt. A hole penetrating in the vertical direction is formed in the center of the body 10 . Inside the body 10, a threaded portion 11 forming a female screw and a spring room portion 12 forming a space for accommodating the spring 20 are configured. The spring room part 12 has an enlarged diameter than the screw thread part 11 and is located on the upper part of the thread part 11 . The spring room part 12 has several steps whose diameter increases toward the top. The spring room portion 12 includes a lower jaw portion 121 extending radially outward from the upper end of the screw thread portion 11, and a first side wall portion 122 extending upward from the outer end of the lower jaw portion 121 in the axial direction. And, the middle jaw portion 123 that extends outward again in the radial direction from the upper end of the first side wall portion 122, and the second side wall portion 124 that extends upward again along the axial direction from the outer end of the intermediate jaw portion 123 again. ), the upper jaw portion 125 extending radially outward from the upper end of the second side wall portion 124 , and the third side wall portion 126 extending upward from the outer end of the upper jaw portion 125 in the axial direction. ) and an upper bent portion 127 bent inward in the radial direction from the upper end of the third side wall portion 126 . The spring 20 is installed on the inner space of the first, second, and third side wall parts 122 , 124 , 126 .

The spring 20 is installed on the upper part of the screw thread part 11 and acts as a part of the female thread. The spring 20 is wound around the bolt to which the inner circumferential surface is fastened to provide a fastening force. In this embodiment, the number of turns (the number of turns) of the spring 20 is twice, but may be smaller or larger than that if necessary.

The spring 20 is placed vertically above the lower jaw portion 121 (see FIG. 2 ). The lower end (front end) of the spring 20 is disposed vertically above the lower jaw portion 121 . The spring 20 is formed along the same rotational direction as the threaded portion 11 so as to act as a part of the female thread together with the threaded portion 11 . The bolt is rotated relative to the nut 1 in the locking direction, enters from the bottom of the threaded portion 11 upwards, and is fastened through the spring 20 .

In a state where the spring 20 is fastened to the outer circumferential surface of the bolt and does not receive any restraint, the spring 20 rotates integrally with the bolt. However, when the upper end (rear end) or lower end (front end) of the spring 20 interferes with the surrounding structure and the position is limited, the diameter of the spring 20 is expanded or reduced, and the frictional force with the outer peripheral surface of the bolt is reduced or increased. The anti-loosening nut according to the present invention can prevent the bolt from loosening by the action of such a spring, and operates to allow loosening again under certain conditions.

2 to 4 , the spring 20 has an anchor 21 bent vertically upward at its upper end (rear end). When fastening with the bolt, the anchor 21 may be deformed radially outwardly by being pushed by the screw thread of the bolt. The second side wall portion 124 is formed to expand in a radial direction than the first side wall portion 122 so that a space in which the anchor 21 is deformed to the outside can be secured. And it is preferable that the upper end of the anchor 21 forms a horizontal plane.

The ring cap 30 is installed on the spring 20 . The ring cap 30 has a lower peripheral portion supported by the upper jaw portion 125 of the spring room portion 12, and the upper portion of the ring cap 30 is supported by the upper bent portion 127 and does not flow in the vertical direction. ) is united with Before forming the upper bent portion 127 in the machining process, in a state where the ring cap 30 is seated on the upper jaw 125, the upper periphery of the body 10 is bent inward by a caulking method to form the upper bent portion ( 127), a structure as shown in FIG. 2 can be formed. In order to enable the caulking process of the upper part of the body 10, the upper part of the body 10 is formed to have a predetermined height and a thin thickness, and the outer peripheral surface of the hexagonal column shape is formed in the lower part. In some cases, the ring cap 30 may not be formed as a separate part, but may be integrally manufactured by forming irregularities on the inner peripheral surface of the upper end of the body 10 and then caulking.

5, the ring cap 30 has a ring shape having a hollow part. A plurality of engaging grooves 31 recessed vertically upward (rear) are formed on the bottom surface of the ring cap 30 . As shown, a plurality of locking grooves 31 are arranged at equal intervals. In the present embodiment, 12 locking grooves 31 are formed, but the number may vary according to need, and may be, for example, 6, 9, 18, or the like. A plurality of locking grooves 31 are radially arranged at equal intervals with respect to the central axis. The locking groove 31 acts as a structure in which the anchor 21 is fitted while the spring 20 rises together with the bolt. To enable this action, the width Wb in the circumferential direction of the locking groove 31 should be larger than the width Wa in the circumferential direction of the anchor 21 . A plurality of locking grooves 31 are arranged at equal intervals, so that the anchor 21 can act the same no matter where it is caught.

And referring to FIG. 6 , the aforementioned lower jaw part 121 forms an inclined surface whose height is gradually lowered along the clockwise rotation direction. As shown, the lower jaw portion 121 is divided into six sections at intervals of 60°, and each section repeats the same inclined surface portion 121b. In the present embodiment, the inclined surface portion 121b of the lower jaw portion 121 is divided into 6 pieces, but may be changed to 9 pieces, 12 pieces, 18 pieces, etc. as needed. A portion where the adjacent inclined surface portions 121b meet forms a locking jaw portion 121a protruding upward (rear). That is, at the lower end of each inclined surface portion 121b, a locking jaw portion 121a protruding in the axial direction is formed. The locking jaw portion 121a acts as a portion where the lower end of the spring 20 relatively rotates in the release direction is caught. A plurality of locking jaws (121a) are arranged at equal intervals, so that the lower end of the spring (20) can act the same no matter where it is caught. In this embodiment, the lower jaw portion 121 is configured with the engaging jaw portion 121a and the inclined surface portion 121b, but in some cases, the lower jaw portion 121 is configured only with the engaging jaw portion 121a without the inclined surface portion 121b. can be That is, as shown in Fig. 21 (a), the inclined surface portion 121b may be omitted by configuring the engaging jaw portion 121a in a shape protruding in a simple concavo-convex shape on the lower jaw portion 121 . The locking jaw portion 121a and the inclined surface portion 121b may be variously deformed, and may be configured, for example, in a shape as shown in (b) or (c) of FIG. 21 .

The anti-loosening nut 1 of the present invention is not limited to the installation position of the spring 20, unlike the anti-loosening nut according to the prior art described above. That is, in the conventional anti-loosening nut, there is a limitation that the anchor at the top of the spring must be seated and coupled to a predetermined notch, but the anti-loosening nut 1 according to the present invention is a structure for fixing the upper end of the spring 20 . Since this does not exist, the spring 20 may be installed anywhere in the spring room portion 12 at any position in the circumferential direction. The anchor 21 at the top of the spring 20 can operate equally no matter which one of the plurality of locking grooves 31 is caught, and the lower end of the spring 20 is the same regardless of which of the several locking jaws 121a is caught. can

The operation of the anti-loosening nut 1 according to the present invention will be described in more detail as follows.

The bolts are fastened from the bottom to the top in the drawing. When rotating in the locking direction, the bolt rotates counterclockwise (CW direction in FIG. 1) with respect to the nut (1). The bolt comes into contact with the spring 20 while ascending through the threaded portion 11 of the body 10 . The spring 20 is pushed up while integrally rotating in the same direction as the bolt since it is not constrained in the rotational direction within the spring room 12 . The spring 20 is pushed up until the upper end of the anchor 21 comes into contact with the bottom surface of the ring cap 30 . In this state, when the spring 20 is further pushed up, the front edge 21a of the top of the anchor 21 is caught on the front side wall 31a forming the locking groove 31, and the rotation of the spring 20 is limited ( Figure 7 (see position A). That is, the anchor 21 is in a fixed end state in the locking direction. In this way, when the bolt is additionally rotated while the anchor 21 of the upper end of the spring 20 is fixed, the spring 20 receives a force extending outward in the radial direction. As the spring 20 is expanded, the frictional force applied to the bolt is reduced, and the bolt can be easily fastened.

When a rotational force is applied so that relative rotation occurs in the loosening direction in a state in which the bolt and the nut 1 are fastened, the spring 20 rotates at a predetermined angle in the loosening direction integrally with the bolt, and then the rear edge 21b of the anchor 21 is The rear side wall 31b constituting the locking groove 31 is caught and the rotation is restricted again (refer to the position B in Fig. 7). That is, the anchor 21 is in a fixed end state even in the loosening direction. In this way, when an additional rotational force is applied in the release direction while the anchor 21 of the upper end of the spring 20 is fixed, the spring 20 receives a radially inwardly contracting force. That is, as the spring 20 is contracted in the radial direction, the frictional force with the bolt is increased to prevent loosening.

7, when a weak force is applied in the loosening direction while the anchor 21 at the top of the spring 20 is supported by the locking groove 31, the anchor 21 sets the fixed end state in the loosening direction. Therefore, as described above, the frictional force between the spring 20 and the bolt increases while a force preventing loosening is applied. However, when a stronger force is applied in the loosening direction, it can reach a state of being separated from the locking groove 31 by elastic deformation of the anchor 21 portion. When the anchor 21 is separated from the locking groove 31, the anchor 21 is converted to a free end state in the loosening direction, so that the spring 20 and the bolt rotate together in the loosening direction. The spring 20 descends to the lower part of the nut 1 while rotating with the bolt. The lower end of the descending spring 20 moves along the inclined surface forming the lower jaw portion 121 and is caught by the engaging jaw portion 121a formed by protruding from the end of the inclined surface portion. That is, the lower end of the spring 20 is in a fixed end state in the loosening direction. When the rotation in the release direction is continued while the lower end of the spring 20 is caught by the locking jaw portion 121a, the spring 20 expands outward and the frictional force between the spring 20 and the bolt is reduced, and the bolt is reduced. It can be easily loosened by rotational force.

In a state in which the anchor 21 is hung in the locking groove 31, the anchor 21 is in a fixed end state in the loosening direction to prevent loosening. On the other hand, in order to separate the anchor 21 from the locking groove 31, a rotational force (torque) of a predetermined size (hereinafter referred to as a threshold value or a threshold value) or more must be applied. The anchor 21 is switched to the free end state in the loosening direction by the rotational force greater than the threshold, and the loosening prevention function is released.

In the case of the above-described conventional anti-loosening nut, in order to release the anti-loosening function, a rotational force large enough to damage or deform the anchor must be applied. On the other hand, the anti-loosening nut 1 according to the present invention has the advantage that the anchor 21 portion of the spring 20 is not damaged in spite of the rotational force greater than or equal to the threshold value, so that it can be used again after releasing the fastening.

<Second embodiment>

Next, the anti-loosening nut 2 according to the second embodiment of the present invention will be described.

9 to 12, the anti-loosening nut 2 according to the second embodiment of the present invention includes a body 10, a spring 20, and a ring cap 30 as in the first embodiment described above. . In the anti-loosening nut 2 according to this embodiment, the structure of the anchor 21 at the top of the spring 20 and the ring cap 30 for hanging the anchor 21 is structurally different from that of the first embodiment described above. have Hereinafter, the anti-loosening nut 2 according to the second embodiment will be described with reference to these structural differences.

The anti-loosening nut 2 comprises a body 10 having a threaded portion 11 . The body 10 includes a spring room portion 12 that forms a space for accommodating the spring 20 at the rear of the screw thread portion 11 . The spring 20 is installed in the spring room part 12 . The spring 20 is installed coaxially with the body 10 in the spring room portion 12, but may be installed at any position in the circumferential direction without being limited by the installation position. As in the first embodiment, a lower jaw portion 121 extending radially from the upper end (rear end) of the screw thread portion 11 is formed in the lower portion of the spring room portion 12 . The lower jaw portion 121 is formed with a locking jaw portion 121a protruding in the axial direction to hang the lower end (front end) of the spring 20 . Six locking jaws (121a) are radially arranged at equal intervals. The number of the locking jaws 121a may vary according to need, for example, may be composed of 9, 12, or the like. A surface between the adjacent locking jaws 121a forms an inclined surface portion 121b that is inclined. The inclined surface portion 121b is inclined downward (forward) toward the loosening direction.

13 and 14 , a plurality of locking grooves 31 recessed radially outward are formed on the inner circumferential surface of the ring cap 30 . At the upper end (rear end) of the spring 20, an anchor 21 that is hooked and fixed to the locking groove 31 is configured. In the present embodiment, the anchor 21 has a shape that protrudes outward in the radial direction as shown in FIG. In the first embodiment described above, the anchor has a shape that is bent upward (rearward) toward the bottom of the ring cap, whereas in this embodiment, the anchor has a shape that protrudes outward in the radial direction There is a structural difference. .

The locking groove 31 has a cross-sectional shape in which the width becomes narrower toward the outside in the radial direction. In this embodiment, the locking groove 31 may be divided into a front inclined side wall 31e, an outer wall 31f, and a rear inclined side wall 31g (see FIG. 14). The anchor 21 protruding outwardly acts to be caught in the locking groove 31 . In more detail, when the bolt and the nut 2 are rotated relative to each other in the locking direction, the spring 20 rotates integrally with the bolt, and as shown in FIG. 14, the front inclined side wall 31e and the outer wall 31f are It is fixed by hanging on the corners where it meets. In this state, the anchor 21 is in a fixed end state in which rotation is restricted in the locking direction. When the bolt rotation continues in the locking direction in a state in which the anchor 21 is switched to the fixed end, the spring 20 receives a radially expanding force, thereby reducing the frictional force between the spring 20 and the bolt, and is necessary for locking. rotational force is reduced.

As shown, in the state in which the anchor 21 is caught in the locking groove 31, the anchor 21 is supported by the inner edge of the rear inclined side wall 31g at an outside point (see FIG. 14 “C”). become in a state of being In this state, when a rotational force is applied in the loosening direction, the anchor 21 receives a radially inwardly increasing force, so that the fixed end state is maintained without departing from the engaging groove 31 . When a force is applied in the loosening direction of the anchor 21 in the fixed end state, the spring 20 receives a radially contracting force, and the frictional force between the spring 20 and the bolt increases to maintain the loosening prevention action. On the other hand, when the rotational force in the loosening direction increases and a strong force greater than the critical value is applied, the anchor 21 is displaced from the locking groove 31 while rotating in the loosening direction together with the bolt in the radially inwardly deformed state. After that, when the rotation in the release direction continues, the lower end of the spring 20 is caught by the locking jaw part 121a and the rotation in the unlocking direction is restricted to a fixed end state. When a rotational force is applied in the loosening direction of the lower end of the spring 20 in the state of the fixed end, the spring 20 receives a radially expanding force, and the frictional force between the spring 20 and the bolt is reduced. The nut 2 can be easily loosened from the bolt, and unlike the anti-loosening nut according to the related art, there is no deformation or damage to the spring 20 and thus can be reused.

<Third embodiment>

Next, the loosening prevention nut 3 according to the third embodiment of the present invention will be described.

The anti-loosening nut 3 according to the third embodiment has the same operation method as the anti-loosening nuts 1 and 2 according to the first and second embodiments described above. However, when rotating in the release direction, the locking jaw for hooking the lower end of the spring is configured on the first side wall of the spring room, and the locking groove for restraining the operation of the spring anchor is on the first side wall of the spring room. It has a structural difference from the previous embodiments in that it is integrally configured. This structural difference will be described in more detail below with reference to the drawings.

15 to 20, the anti-loosening nut 3 according to the third embodiment of the present invention has a body 10, a spring 20, and a ring cap as in the first and second embodiments described above. (30).

The body 10 has an outer peripheral surface in the form of a hexagonal column. A through hole for inserting the bolt is formed along the central axis direction of the body 10 . The inner peripheral portion of the body 10 is configured with a threaded portion 11 forming a female screw and a spring room portion 12 forming a space for accommodating the spring 20 . The spring 20 is installed coaxially with the body 10 in the spring room portion 12, and may be installed at any position in the circumferential direction without being limited by the installation position. The spring room part 12 is located in the upper part (rear) of the thread part 11, and has a shape extending in the radial direction of the thread part 11.

The spring room portion 12 includes a lower jaw portion 121 extending radially outward from the upper end of the screw thread portion 11 , and a first side wall portion 122 extending upwardly along the axial direction from the outer periphery of the lower jaw portion 121 . ), an intermediate jaw portion 123 extending radially outward again from the upper end of the first side wall portion 122, and a second side wall portion extending upward in the axial direction from the outer periphery of the intermediate jaw portion 123 again ( 124 , and an upper bent portion 127 bent inward in the radial direction from the upper end of the second side wall portion 124 .

The spring 20 is installed on the inner space of the first side wall part 122 , and the ring cap 30 supports the upper part of the spring 20 so that the spring 20 does not come off to the upper part. The ring cap 30 has a circular ring shape in the form of a plate. The ring cap 30 is formed integrally with the body 10 without flowing in the vertical direction as the bottom circumferential portion of the ring cap 30 is supported by the middle chin portion 123 , and the upper circumferential portion is supported by the upper bent portion 127 . In the machining process, before forming the upper bent portion 127, the upper periphery of the body 10 is bent inward in a caulking manner in a state where the ring cap 30 is seated on the middle chin portion 123, and the upper bent portion ( 127), a structure as shown in Fig. 16 can be formed. This structure is the same as the upper bending part processing method described in the first embodiment.

As shown in Fig. 19, an anchor 21 having a shape protruding outward in the radial direction is configured at the upper end of the spring 20. As shown in Figs. And on the first side wall portion 122 constituting the spring room portion 12, a locking groove 131 for restricting the circumferential movement of the anchor 21 is formed. In the second embodiment, the locking groove 31 was formed on the inner circumferential surface of the ring cap 30, whereas in this embodiment, the locking groove 131 forms the spring room part 12 on the first side wall part ( 122), there is a difference in that it is integrally formed.

The actions of the anchor 21 and the locking groove 131 are the same as in the second embodiment described above. That is, the locking groove 131 has a cross-sectional shape that becomes narrower toward the outside in the radial direction. The locking groove 131 may include a front inclined side wall 131e, an outer wall 131f, and a rear inclined side wall 131g. The anchor 21 protruding outward in the radial direction is caught in the locking groove 131 . That is, when the bolt and the nut 3 are rotated relative to each other in the locking direction, the end of the anchor 21 is hung and supported on the front inclined side wall 131e. That is, the anchor 21 is in a fixed end state in which rotation is restricted in the locking direction. On the other hand, when rotating in the loosening direction, the anchor 21 is supported by the inner edge portion (the “C” part of FIG. 19 ) of the rear inclined side wall 131a and is in a state of receiving a force in the direction preventing the loosening. That is, the anchor 21 maintains the fixed end state with respect to the rotational force in the loosening direction below a predetermined threshold. Therefore, loosening is prevented by the action of a force that prevents loosening. In this state, when a rotational force is applied in the loosening direction of a predetermined threshold or more, the anchor 21 is rotated in the loosening direction together with the bolt while being deformed in the radial direction to be separated from the locking groove 131, and the anchor is converted to a free end state. In the present embodiment, 12 locking grooves 131 are radially arranged at equal intervals, but may be changed to 6, 9, 18, or the like.

Referring to FIG. 20 , on the first sidewall 122 constituting the spring room portion 12 , a locking jaw portion 141 for restricting the circumferential movement of the lower end of the spring 20 is formed. The locking jaw part 141 acts to limit rotation in the release direction by engaging the lower end of the spring 20 rotating in the release direction. That is, as shown in FIG. 20 , when the spring 20 moves to a position indicated by a dotted line in a state in which it rotates together with the bolt in the loosening direction, the outer edge of the lower end of the spring 20 forms the locking jaw portion 141 . is caught, and the lower end of the spring 20 is converted to a fixed end state. It is preferable that the lower end of the spring 20 has a shape bent to a predetermined degree outward in the radial direction so that the latching action is easy. In the first and second embodiments described above, the locking jaw portion 121a for fixing the lower end of the spring 21 is formed on the lower jaw portion 121 for supporting the bottom of the spring 20, whereas this embodiment In the example, there is a structural difference in that the locking jaw portion 141 for fixing the lower end of the spring 20 is formed on the first side wall portion 122 . In the present embodiment, six locking jaws 141 are radially arranged at equal intervals, but the number may be changed to 9, 12, or the like.

Referring to FIGS. 17 and 18 , a first sidewall groove 122a and a second sidewall groove 122b which are indented outward in the radial direction are formed on the inner circumferential surface constituting the first sidewall part 122 . The first sidewall grooves 122a and the second sidewall grooves 122b are alternately arranged along the circumferential direction. The first sidewall groove 122a is formed long from the top to the bottom of the first sidewall portion 122 , and the second sidewall groove 122b is formed from the top of the first sidewall portion 122 to a predetermined depth. . That is, the first sidewall groove 122a is formed to be deeper than the second sidewall groove 122b. The upper end of the first side wall groove 122a may function as the above-described engaging groove 131 , and the lower end thereof may function as the above-described engaging projection 141 . That is, one first side wall groove 122a may act as both the locking groove 131 and the locking jaw 141 . On the other hand, since the second sidewall groove 122b is formed to have a short depth, it can act only as the locking groove 131 . In this embodiment, the first sidewall grooves 122a and the second sidewall grooves 122b having different depths are alternately configured, but in some cases, the first sidewall grooves 122a without the second sidewall grooves 122b. It may consist of only

1, 2, 3: Anti-loosening nut 10: Body
11: thread part 12: spring room part
20: spring 21: anchor
30: ring cap 31, 131: locking groove

Claims (6)

In the anti-loosening nut comprising a body having a threaded portion forming a female screw, a spring embedded in the body to form a part of the female screw, and a ring cap covering the spring so as not to be separated from the body,
The body includes a spring room portion forming a space for accommodating the spring at the rear of the screw thread portion, and the ring cap is coupled to an upper end of the spring room portion,
The spring can be installed at any position in the circumferential direction within the spring room,
The spring is limited in movement by interference with adjacent structures in the spring room portion, so that when the nut rotates relative to the bolt to be fastened in the locking direction, the spring becomes a fixed end state at the rear end of the spring in a direction in which the radius is expanded In a state in which the frictional force between the bolt and the spring is reduced by receiving a force, and a rotational force less than a threshold value is applied when the nut is rotated in the loosening direction in a state in which the bolt is fastened to the bolt, the rear end of the spring maintains a fixed end state, so that the spring The anti-loosening action is maintained by increasing the friction force between the bolt and the spring by receiving a force in the direction in which the radius is reduced. It becomes rotatable, and when the rear end of the spring is rotated in the release direction in a state in which it is converted to the free end, the front end of the spring becomes a fixed end state and receives a force in the direction in which the radius of the spring expands between the bolt and the spring. acts to reduce friction,
The spring room portion is a lower jaw extending radially outwardly from the upper end of the screw thread portion, a first side wall portion extending upwardly along the axial direction around the outer periphery of the lower jaw portion, and bending inward in a radial direction from an upper portion of the first side wall portion Including an upper bent portion formed by
An anchor protruding outwardly toward the first side wall is formed at the rear end of the spring, and a plurality of locking grooves are formed in the upper portion of the first side wall to catch and support the anchor when rotating in the locking direction, An anti-loosening nut having a plurality of engaging projections formed on the lower portion of the first side wall to be supported by the lower end of the spring when rotated in the loosening direction. According to claim 1,
The locking groove and the locking jaw are anti-loosening nuts formed by a side wall groove formed by indenting outward in a radial direction from the first side wall part. 3. The method of claim 2,
The spring room part includes a middle chin part extending radially outward from the upper end of the first side wall part and a second side wall part extending upwardly along the axial direction from the outer periphery of the middle chin part,
The upper bent part is configured on the upper end of the second side wall part,
The ring cap is provided in the form of a circular ring on a plate and is supported so as not to flow in the vertical direction by the intermediate jaw portion and the upper bent portion. In the anti-loosening nut comprising a body having a threaded portion forming a female screw, a spring wound around a bolt that is built into the body and fastened to form a part of the female screw, and a ring cap that covers the spring so as not to be separated from the body,
The body includes a spring room portion forming a space in which the spring is to be embedded, and the spring is limited in movement by interference with an adjacent structure within the spring room portion, so that the nut is relative to the bolt to be fastened in the locking direction. When the spring rotates, the rear end becomes a fixed end state and receives a force in the direction in which the radius is expanded, thereby reducing the frictional force between the bolt and the spring. In this applied state, the rear end of the spring maintains the fixed end state and receives a force in the direction in which the radius of the spring is reduced, and the friction force between the bolt and the spring increases to maintain the loosening prevention action, and the When the rear end of the spring is switched to the free end state, the spring becomes rotatable in the loosening direction together with the bolt. Acts to reduce the frictional force between the bolt and the spring by receiving a force in the direction in which the radius of the spring expands,
The spring is installed on the same axis as the body, and the spring can be installed at any position in the circumferential direction within the spring room part,
The anti-loosening nut includes a plurality of locking grooves through which an anchor formed at the rear end of the spring is hooked so that the rear end of the spring is in a fixed end state when rotating in the locking direction, and the front end of the spring is in a fixed end state when rotating in the unlocking direction. Including a plurality of locking jaws caught on the front end of the spring,
The plurality of locking grooves and the plurality of locking jaws are anti-loosening nuts, characterized in that formed on a side wall portion constituting the spring room portion. 5. The method of claim 4,
The plurality of engaging grooves are radially arranged at equal intervals,
The anti-loosening nut, characterized in that the plurality of locking jaws are also radially arranged at equal intervals. 6. The method of claim 5,
The locking groove and the locking jaw are anti-loosening nut, characterized in that formed by a side wall groove formed by indenting radially outward from the side wall portion.

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