JP6347367B2 - Locking nut - Google Patents

Description

  The present invention relates to a locking nut.

  Conventionally, as a locking nut, for example, an annular caulking portion is provided on the upper end surface of a nut body in which a screw hole penetrating in the axial direction is formed in the center portion, and a flat plate horizontally concentrically with the screw hole inside the caulking portion. The convex elastic washer is fixed by caulking, and two convex engagements are formed on the inner peripheral surface of the elastic washer so as to protrude flush with each other radially inward as shown in FIGS. 17 and 18, for example. The pieces a, a ′ and the two notched recesses b, b ′ are alternately formed at equal intervals of 90 °, and the inner peripheral surfaces of the convex engaging pieces a, a ′ are screw holes. The inner circumferential surface of each notch recess b, b 'is formed in an arc shape larger in diameter than the valley diameter of the screw hole.

  When the locking nuts are screwed into the bolts, the convex engaging portions a and a ′ having a 90 ° arc width on one side of the elastic washer are used for searching for the screw thread of the bolt. The screw thread of the bolt is strongly pressed while elastically deforming the convex engagement pieces a and a ′ having a 90 ° arc width on the other side while preventing the natural rotation. Friction torque (hereinafter referred to as pre-leveling torque) is generated to prevent the nut from loosening.

  By the way, the above-described elastic washer having the above-described configuration is formed by punching a flat plate, for example, and has two convex engagement pieces a having a circular outer periphery and an arc width of 90 ° at the center thereof. , A ′ and two notch recesses b, b ′ are formed alternately, and has a simple flat plate shape as shown in FIG. Therefore, when the convex engagement pieces a and a ′ having an arc width of 90 ° are elastically deformed and brought into contact with the screw threads of the bolts, both ends on the protruding side of the convex engagement pieces a and a ′ The corners are forced to elastically deform while screwing into the screw threads. As a result, the convex engagement pieces a and a ′ are difficult to smoothly enter between the screw threads of the bolt, and there is a problem that workability is poor. Moreover, the projecting side end corners of the projecting engagement pieces a and a ′ are liable to damage the screw thread of the bolt, and it is a major disadvantage that it causes corrosion and seizure due to plating peeling. is there. Moreover, if the screw thread of the bolt is damaged by the projecting side end corners of the convex engagement pieces a, a ′, there is a problem that the reuse becomes impossible. There was also a problem that the plating could cause corrosion due to peeling or burnt, making it impossible to reuse.

  Therefore, the present invention aims to improve workability by easily screwing into the bolt by devising the shape of the protruding corner portion of the convex engaging portion piece of the elastic washer in the locking nut, It is an object of the present invention to develop a locking nut that is difficult to damage the screw thread of the bolt, prevents corrosion due to plating peeling, prevents seizure, and reliably maintains the locking effect of the nut by the convex engagement piece.

In the invention according to claim 1 of the present application, an annular caulking portion is provided on the upper end surface of the nut body in which a screw hole penetrating in the axial direction is formed in the center portion, and the caulking portion is horizontally concentric with the screw hole. In a locking nut with a flat elastic washer fixed by caulking, the inner surface of the elastic washer protrudes radially inward and the protruding inner surface is formed in an arc shape having substantially the same diameter as the inner diameter of the screw hole. On the other hand, a plurality of convex engagement pieces are formed alternately with a plurality of cutout recesses whose inner surface is formed in an arc shape having a diameter larger than the valley diameter of the screw hole. A curved guide portion that curves upward is formed at the projecting peripheral edge portion that is all the projecting tip portions of the pieces, and each curved guide portion is from one side end to the other side end of the convex engagement piece. Is formed continuously over the entire circumference of the protruding inner peripheral edge, and all Curved guide unit is characterized by being formed to exhibit the same end face shape at the same height as viewed from the side.

The invention according to claim 2 of the present application is the configuration according to claim 1, wherein the plurality of convex engaging pieces formed on the inner peripheral surface of the elastic washer are formed with their arc width angles different from each other. It is characterized by being.

In the invention according to claim 3 of the present application, in the configuration according to claim 1 or claim 2, the plurality of cutout recesses formed on the inner peripheral surface of the elastic washer are formed by making the arc width angles different from each other. Thus, the formation position of the adjacent convex engagement piece is changed, and the torque at the time of screwing is reduced or increased.

According to the invention described in claim 1 of the present application, the curved guide portion that curves upward to the protruding peripheral edge portion that is the protruding tip portion of all of the plurality of convex engaging portion pieces in the flat elastic washer for preventing loosening. Each curved guide portion is formed continuously over the entire circumference of the protruding inner peripheral end from one side end to the other side end of the convex engagement piece piece, and all the curved guide portions are in side view. Since it is formed so as to exhibit the same end face shape at the same height, when the respective convex engaging pieces are inserted between the screw threads of the bolt, the curved guide portions that are curved upward are more actively used. It can be guided to get in between the threads. As a result, the protruding side corner portion of the convex engagement piece hits the screw thread, and it is not only eliminated that the protruding engagement corner piece enters the screw thread while being in the bumped state. The convex engagement piece is guided into the curved surface and is smoothly screwed between the bolt threads. Therefore, the screwing operation can be remarkably enhanced, and the protrusion side corners of the convex engagement piece can be prevented from damaging the screw thread of the bolt, and corrosion and seizure from the wound can be prevented. be able to. In addition, since the screw thread of the bolt is not damaged by the protruding side corner of the convex engagement piece, the bolt and the locking nut can be reused.

Further, according to the invention described in claim 2 of the present application, in addition to the above-described effect, for example, two first convex engagement portions and a second convex engagement portion in a flat elastic washer for preventing loosening. Among the pieces, a large contact area and a large shaft can be obtained by widening the angle of the first convex engagement portion piece that generates a pre-belting torque that prevents natural rotation by strongly pressing the screw thread while being elastically deformed. The screw thread of the bolt can be strongly pressed by the amount of deformation in the direction. As a result, when the pre-leveling torque value of the flat elastic washer is set to be the same as the required pre-torque torque value, the thickness of the washer can be reduced compared to the thickness of the conventional flat elastic washer.
Therefore, by setting the thickness of the flat elastic washer to be thin, it is possible to enter it while being easily elastically deformed even by manual work. A synergistic effect with the effect can be obtained, and the work can be further enhanced. In addition, the screw thread of the bolt is hardly damaged, and corrosion and seizure from the damaged part can be suppressed. Therefore, a synergistic effect with the above-described effect of the curved guide portion can be obtained, and the work can be further enhanced.

Further, according to the invention described in claim 3 of the present application, in addition to the effect of the curved guide portion described above, for example, two first concave notch portions and second concave notch portions in a flat elastic washer for preventing loosening. By adopting a configuration in which the arc width is made different, it is possible to reduce or increase the torque at the time of screwing by changing the formation position of the first convex engagement portion piece with respect to the second convex engagement portion piece. As a result, the hardness of the convex engagement piece can be adjusted more broadly while being elastically deformed and brought into contact with the screw thread of the bolt. As a result, by changing the formation position of the convex engagement piece in addition to the curved guide part of the convex engagement piece, the angle of the convex engagement piece, and the thickness of the elastic washer, Work can be significantly enhanced.

It is a top view of the locking nut which concerns on this invention. It is a partially cutaway front view of the nut. It is a top view of a flat elastic washer. It is an AA line expanded sectional view of FIG. It is sectional drawing which shows a use condition. It is a top view of another flat elastic washer. FIG. 7 is an enlarged sectional view taken along line B-B in FIG. 6. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of another flat elastic washer. It is a top view of the conventional flat elastic washer. It is the CC sectional view taken on the line of FIG.

  Hereinafter, a locking nut according to the present invention will be described with reference to the drawings.

  1 and 2 show a locking nut according to the present invention. The locking nut N includes a nut main body 1 having a screw hole 1a penetrating in the axial direction in the center, and an upper surface of the nut main body 1. And a plate-like elastic washer 2 that is crimped. An annular caulking portion 11 that is concentric with the screw hole 1 a and larger than the root diameter of the screw hole 1 a is provided on the upper surface of the nut body 1, and a seat portion 12 is provided at the lower portion of the nut body 1. . The shape of the nut body 1 is a hexagonal shape in plan view as shown in FIG. 2, and may be a polygon or a cylinder such as a quadrangle or an octagon, for example. A bowl-shaped seat (not shown) or the like may be provided.

  The flat elastic washer 2 is made of a metal elastic plate as shown in FIG. 3, and protrudes radially inward on the inner peripheral surface thereof, and its protruding end is in an arc shape having the same diameter as the inner diameter of the screw hole 1a. Two formed first and second convex engaging pieces 21, 22 and two first and second concave notches formed on the inner surface in an arc shape having a diameter larger than the valley diameter of the screw hole. The portions 23 and 24 are alternately formed.

  And, in the flat elastic washer 2 of the present invention, as shown in FIGS. 3 and 4, the entire projecting inner peripheral end from each side end of the first and second convex engaging pieces 21, 22 is shown. Curvature guide portions 21a and 22a that are curved upward are formed around the circumference. The curved guide portions 21a and 22a make use of the characteristics of the curved shape to allow the convex engaging pieces 21 and 22 to enter between the screw threads 3a of the bolt 3 described later, or from the bolt 3 to prevent the loosening nut N. When removing the first and second projecting engagement pieces 21 and 22, the protruding side end corners are prevented from abutting against the thread 3 a and are actively guided to smoothly move between the threads. It is for entering and moving smoothly between the threads.

  Here, in the embodiment shown in FIGS. 1 to 5, one of the first and second convex engaging portion pieces 21 and 22 is one first convex engaging portion piece 21 and the other second convex engaging portion. The angle is 180 ° larger than that of the piece 22 and formed into a convex engagement piece having a wide arc width, and the other second convex engagement piece 22 has a small angle of 90 ° and a narrow arc width. It is formed on the convex engagement piece. Further, the first and second concave cutout portions 23 and 24 interposed between the first convex engagement piece 21 and the second convex engagement piece 22 have an arc width of 45 °, respectively. Is formed.

  Further, the thickness of the flat elastic washer 2 is formed to be thinner than the thickness of the conventional elastic washer, so that the convex engaging parts 21 and 22 can be easily inserted between the bolt threads by hand. It is possible to make it. In other words, the arc width (180 °) of the first convex engagement piece 21 is set twice as large as the arc width (90 °) of the second convex engagement piece 22. If it is the same thickness as the thickness, the pre-leveling torque is set to be large accordingly. For this reason, when the pre-leveling torque value of the flat elastic washer 2 is set to be the same as the required pre-ringing torque value, the thickness of the flat elastic washer 2 is reduced compared to the thickness of the conventional elastic washer. As a result, it is possible to easily allow the convex engagement pieces 21 and 22 to easily enter between the screw threads of the bolt.

  The flat elastic washer 2 formed in this way is caulked and fixed in the annular caulking portion 11 in a horizontal manner concentric with the screw hole 1a.

  Specifically, when the plate-like elastic washer 2 is caulked and fixed to the upper surface of the nut body 1, a counterbore (not shown) is formed on the upper end surface of the nut body 1 concentrically with the screw hole 1a in advance. The flat elastic washer 2 is positioned and placed concentrically with the screw hole 1a on the bottom surface of the hole, and then the flat elastic washer 2 is fixed to the bottom surface of the counterbored hole by caulking the peripheral wall of the counterbore hole. The

  Next, the operation of the locking nut configured as described above will be described.

  At the time of use, as shown in FIG. 5, a locking nut N is manually screwed into the bolt 3, and then the locking nut N is tightened with a proper tightening tool to firmly tighten the object to be tightened (not shown). Tighten. During the screwing, the curved guide that curves upward from the both side ends of the first convex engaging piece 21 and the second convex engaging piece 22 of the elastic washer 2 over the entire circumference of the protruding inner peripheral end. Since the portions 21a and 22a are formed, when the first and second convex engaging pieces 21 and 22 are inserted between the screw threads 3a of the bolt 3, the bending guide portions 21a that bend upward are provided. It can be actively guided by 22a so as to enter between the threads. As a result, the protruding side corners of the first and second convex engaging pieces 21 and 22 hit the screw thread 3a as in the prior art, and enter between the screw threads in the abutted state. The first and second convex engaging pieces 21 and 22 are smoothly screwed between the screw threads 3a of the bolt 3 by being guided by the curved surfaces of the curved guide portions 21a and 22a. It will be. Therefore, the screwing operation can be remarkably enhanced, and the protruding side corners of the first and second convex engaging pieces 21 and 22 can be prevented from damaging the thread 3a of the bolt 3. Corrosion and seizure from scratches can be prevented. In addition, since the thread 3a of the bolt 3 is not damaged by the protruding side corners of the first and second convex engaging pieces 21, 22, the bolt 3 and the locking nut N can be reused. It becomes possible.

  Moreover, in the Example shown in FIGS. 1-5, the angle of the circular arc width of the 1st convex engagement part piece 21 is larger than 180 degrees, and the angle of the circular arc width of the 2nd convex engagement part piece 22 is larger than 90 degrees. And the angle of the arc width of the first and second concave cutouts 23 and 24 interposed between the first convex engagement piece 21 and the second convex engagement piece 22 is 45 respectively. Therefore, in addition to the effects of the curved guide portions 21a and 22a described above due to its unique shape, it can be easily screwed in by the following manual operation.

  First, by using the first concave notch 23 of the flat elastic washer 2 thinned manually, the second convex engagement piece 22 is searched for the rise of the screw 3a of the bolt 3, and from this rise the first The two convex engaging piece 22 is inserted between the threads and screwed. At this time, the second convex engagement piece 22 has an angle of 90 °, a narrow arc width, and is screwed between the threads with almost no deformation, so it does not function as a spring for preventing loosening.

  Next, by continuing to manually rotate the locking nut N to the bolt 3, the screw 3a of the bolt 3 is lifted up from the gap of the second notch recess 24 of the flat elastic washer 2 to the first convex engagement. The joint piece 21 is inserted and screwed. As a result, the first convex engagement piece 21 having an angle of 180 ° and a wide arc width is screwed in while being elastically deformed between the threads.

  When the first convex engagement piece 21 is screwed between the threads, the first convex engagement piece 21 is 180 ° and its arc width is 2 of the arc width of the second convex engagement piece 22. Since it is formed so as to be doubled, the screw thread of the bolt can be strongly pressed with a large contact area and a large amount of deformation in the axial direction. As a result, when the pre-balancing torque value for obtaining the pre-baling torque value of the flat elastic washer 2 is set, the thickness of the washer can be reduced compared to the thickness of the conventional flat elastic washer.

  Therefore, by setting the thickness of the flat elastic washer to be thin, it is possible to enter it while being easily elastically deformed even by manual work. The effect of such a unique shape and the curved guide portion 21a described above can be obtained. , 22a and a synergistic effect can be obtained, and the work can be further enhanced.

  Further, the arc width and the number of the convex engaging piece and the concave notch of the flat elastic washer 2 are not limited to those of the above-described embodiment, and the type and size of the bolt to be used. Or you may form by selecting suitably according to a use etc.

  For example, as shown in FIGS. 6 and 7, the first and second convex engaging portions 21 and 22 in the flat elastic washer 2 and the first. The second concave notches 23 and 24 may be alternately formed with arc widths of equal intervals of 90 °.

  Further, the first convex engagement piece 21 is formed in an arc width in the range of 150 ° to 240 °, and the other second convex engagement piece 22 is formed in an arc width in the range of 60 ° to 90 °. Further, the first and second concave cutout portions 23 and 24 interposed between the first convex engagement portion piece 21 and the second convex engagement portion piece 22 are arcs in the range of 30 ° to 60 °, respectively. The width may be selected as appropriate.

  Specifically, as shown in FIG. 8, the arc width of the first convex engagement piece 21 is increased to 180 °, and then the arc width of the second convex engagement piece 22 is set to 60 °. Further, the arc width of the first and second concave cutouts 23 and 24 is formed to 60 °, or the arc width of the first convex engagement piece 21 is increased to 120 ° as shown in FIG. The arcuate width of the second convex engaging piece 22 is 60 ° and the arcuate widths of the first and second concave cutouts 23 and 24 are 90 °. As shown in FIG. The arcuate width of the first engagement portion 21 is increased to 120 °, the arc width of the second convex engagement portion 22 is increased to 90 °, and the arcs of the first and second concave notches 23 and 24 As shown in FIG. 11, the first convex engagement piece 21 has an arc width of 150 °, the second convex engagement piece 22 has an arc width of 90 °, as shown in FIG. 1st and 2nd concave The arcuate widths of the notches 23 and 24 are formed to 60 °, and the arcuate width of the first convex engagement piece 21 is increased to 240 ° as shown in FIG. The arcuate width of the engagement piece 22 may be 60 °, and the arc widths of the first and second concave cutouts 23 and 24 may be 30 °.

  Thus, by appropriately selecting the arc widths of the first and second convex engaging portion pieces 21 and 22 and the first and second concave notched portions 23 and 24, the type, size, or application of the bolt to be used. It is possible to set the thickness of the flat elastic washer 2 to an optimum state while obtaining a pre-leveling torque obtained in a shape adapted to the above. As a result, the locking nut N can be screwed into the bolt by hand more easily according to the type, size, or application of the bolt to be used. The effect of such a unique shape and the above-described curved guide portion 21a, A synergistic effect with the effect of 22a can be obtained, and the work can be further enhanced. In addition, the screw thread of the bolt is hardly damaged, and corrosion and seizure from the damaged part can be suppressed.

  Furthermore, the arc width of the first and second concave notches 23 and 24 is not limited to the same arc width as in the above-described embodiment, and the first notch recess 23 and the second notch recess 24 are Either one of the notch recesses may be formed in a notch recess having a larger angle than the other notch recess and having a larger arc width than the other notch recess. This changes the formation position in the circumferential direction of the first convex engagement part piece 21 with respect to the second convex engagement part piece 22, and reduces the torque at the time of screwing by making use of the characteristics depending on the formation position, Or you may make it increase.

  Specifically, for example, as shown in FIG. 13, the arc width of the first convex engagement piece 21 is increased to 120 ° and the arc width of the second convex engagement piece 22 is formed to 60 °. The first concave notch 23 has an arc width of 120 °, and the second concave notch 24 has an arc width of 60 °, and the first convex notch 23 has a large arc width. By screwing the engaging piece 21, the torque at the time of screwing can be reduced. Further, as shown in FIG. 14, the arc width of the first convex engaging piece 21 is increased to 150 ° and the arc width of the second convex engaging piece 22 is formed to 60 °, while the first concave shape The arcuate width of the notch 23 is formed at 60 °, and the arcuate width of the second concave notch 24 is formed at 90 °, and the first convex engaging piece is formed via the first concave notch 23 having a narrow arc width. The torque at the time of screwing can be increased by screwing 21.

  Thus, by making the arc widths of the first concave notch 23 and the second concave notch 24 different, the circumferential direction of the first convex engaging piece 21 with respect to the second convex engaging piece 22 is made. The forming position can be changed to reduce or increase the torque at the time of screwing. As a result, the hardness of the convex engagement piece can be adjusted more broadly while being elastically deformed and brought into contact with the screw thread of the bolt. As a result, the curved guide portions 21a and 22a are changed by widely changing the formation position of the convex engagement piece in addition to the angle of the convex engagement piece and the thickness of the flat elastic washer 2 for preventing loosening. As a result, the work can be further enhanced, and the screw thread of the bolt is hardly damaged, and corrosion and seizure from the damaged part can be suppressed.

  As described above, when the two convex engaging pieces and the concave notch are formed in a unique shape, the thickness of the flat elastic washer 2 is, for example, the plate thickness of a conventional flat elastic washer is 0. .3 mm, the plate thickness is reduced to 0.2 mm, or the plate thickness of the conventional flat elastic washer is 0.2 mm, the plate thickness is reduced to 0.15 mm, or the conventional plate elastic If the plate thickness of the washer is 0.15 mm, the plate thickness is reduced to 0.1 mm.

  On the other hand, as the number of the convex engagement portion pieces and the concave cutout portions of the flat elastic washer 2, for example, as shown in FIGS. 15 and 16, the convex engagement piece pieces and the concave cutout portions in the elastic washer 2 are used. Of course, it is possible to use three each.

FIG. 15 shows that the three arcuate engagement portions 21, 22, 21 ′ and the three concave notches 23, 24, 23 ′ are each 60 ° in arc width, and they are equally spaced from each other. In FIG. 16, the three convex engaging portions 21, 22, 21 ′ are formed with an arc width of 90 °, and the three concave cutouts 23 are formed. , 24, and 23 'are formed at 30 ° arc widths.
Thus, even when the number of the convex engagement part pieces and the concave notch parts is three, the curved guide parts 21a, 22a, 21'a formed on the respective convex engagement part pieces 21, 22, 21 '. Thus, the same excellent effects as those of the above-described embodiment can be obtained.

  The curved guide portions 21a, 22a, and 21'a extend from the both side ends of the first and second convex engaging pieces 21 and 22 to the entire circumference of the protruding inner peripheral end as in the various embodiments described above. Of course, in addition to forming a curve so as to face upward, for example, the first and second convex engagement pieces 21 and 22 may be formed continuously from the both corners to the projecting inner peripheral edge.

N Locking nut 1 Nut body 1a Screw hole 11 Ring caulking portion 2 Elastic washer 21 First convex engagement portion piece 21a Curved guide portion 21 'Convex engagement portion piece 21'a Curved guide portion 22 Second convex engagement Joint piece 22a Curved guide portion 23 First concave notch 24 Second concave notch

Claims (3)

An annular caulking portion is provided on the upper end surface of the nut body, in which a screw hole penetrating in the axial direction is formed at the center, and a flat elastic washer is caulked and fixed concentrically with the screw hole inside the caulking portion. In the locking nut, a plurality of convex engaging pieces protruding radially inwardly on the inner peripheral surface of the elastic washer and having the protruding inner peripheral surface formed in an arc shape having substantially the same diameter as the inner diameter of the screw hole, The plurality of notch recesses formed in an arc shape whose inner surface is formed in an arc shape larger than the valley diameter of the screw hole are alternately formed, and are all projecting tip portions of the plurality of projecting engagement pieces. A curved guide portion that curves upward is formed at the protruding peripheral edge portion, and each curved guide portion is continuously formed over the entire circumference of the protruding inner peripheral end from one end of the convex engagement piece to the other end. And all curved guides are in side view Locking nut, characterized in that it is formed to exhibit the same end face shape in one height.   2. The locking nut according to claim 1, wherein the plurality of convex engaging pieces formed on the inner peripheral surface of the elastic washer are formed with different arc width angles.   A plurality of cutout recesses formed on the inner peripheral surface of the elastic washer are formed with different arc width angles, thereby changing the formation position of adjacent convex engagement pieces, and when screwing The loosening prevention nut according to claim 1 or 2, wherein the torque is reduced or increased.

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