JP5957632B2 - Locking nut - Google Patents

Description

  The present invention relates to a locking nut.

  Conventionally, as a locking nut, an annular caulking portion is provided at 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 a flat plate shape is concentric with the screw hole and horizontally inside the caulking portion. On the other hand, the elastic washer is fixed by caulking. On the inner peripheral surface of the elastic washer, as shown in FIG. 12, two convex engaging pieces a, a ′ and 2 projecting in a flush manner inward in the radial direction. The notch recesses b and b ′ are alternately formed at equal intervals of 90 °, and the inner peripheral surface of each convex engagement piece a is a circular arc having the same diameter as the inner diameter of the screw hole. And the inner peripheral surface of each notch recess b, b ′ is formed in an arc shape having a diameter larger than the valley diameter of the screw hole.

  When the locking nut is screwed into the bolt, the convex threaded portion of the 90 ° arc width on one side of the elastic washer is used to search for the screw thread of the bolt. Friction torque (hereinafter referred to as pre-leveling) that prevents the natural rotation of the bolt by applying pressure to the threaded portion of the bolt while elastically deforming the convex engaging piece with a 90 ° arc width on the other side. (Referred to as torque) to prevent the nut from loosening.

  However, in the conventional elastic washer having the above-described configuration, it is possible to manually insert the projecting engaging piece having a 90 ° arc width while being elastically deformed and in contact with the screw thread of the bolt. There is a problem that it is hard and difficult and the workability is very poor. Further, the projecting engagement piece is liable to damage the screw thread of the bolt, and causing a seizure is a major drawback and a problem.

  Therefore, the present invention is devised so that it can be easily screwed into the bolt even by manual work by devising the shape, forming position, thickness, and caulking fixing method of the convex engagement piece in the flat elastic washer for preventing loosening. As a result, it is necessary to develop a locking nut that improves workability, prevents the screw thread from being damaged, prevents seizure, and reliably maintains the locking effect of the nut by the convex engagement piece. And

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. While the flat elastic washer is caulked and fixed, two first convex engaging pieces and a second convex engaging piece protruding radially inward from the inner peripheral surface of the elastic washer And two first notch recesses and second notch recesses are alternately formed, and one of the first projecting engagement pieces and the second projecting engagement piece is the first projecting engagement. The piece has a larger angle than the other second convex engaging piece and is formed in a convex engaging piece having a wide arc width, and the other second convex engaging piece has a smaller angle. is formed in a narrow convex engaging piece having an arc width, the inner peripheral surface of each convex-like engaging piece is formed in a circular arc shape of substantially the same diameter as the inner diameter of the screw hole bets In, than the root diameter of the inner surface screw holes of each cutout recess is formed in an arc shape having a large diameter, and, among the first cutout recess and a second cutout recesses, one cutout recess or the other notch The angle is larger than that of the recess, and is formed in a notch recess having a larger arc width than the other notch recess, thereby changing the formation position of the first projecting engagement piece with respect to the second projecting engagement piece. To reduce or increase the torque at the time of screwing .

Of the two convex engaging pieces in the flat elastic washer for preventing loosening, a first convex engagement member that generates a pre-baling torque that strongly presses the screw thread of the bolt while elastically deforming to prevent natural rotation. By widening the angle of the joint piece, 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-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 plate-like elastic washer to be thin, it is possible to enter it while easily elastically deforming it manually. That is, the work can be remarkably enhanced, the screw thread of the bolt is hardly damaged, and the seizure can be suppressed. Moreover, by changing the arc width of the first concave notch and the second concave notch to change the formation position of the first convex engaging piece with respect to the second convex engaging piece, Torque during screwing can be reduced or increased. 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 work can be remarkably improved 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 for locking. In addition to making it difficult to damage the thread of the bolt, seizure can be suppressed.

It is a top view of the reference example of the locking nut provided with the composition used as the basis of the present invention. It is a partially notched front view of the nut of the reference example . It is a top view of the flat elastic washer of the reference example . It is sectional drawing which shows the use condition of the reference example . It is a top view of another flat elastic washer of the reference example . It is a top view of another flat elastic washer of the reference example . It is a top view of another flat elastic washer of the reference example . It is a top view of another flat elastic washer of the reference example . It is a top view of the flat elastic washer of the reference example . It is a top view of the flat elastic washer which concerns on this invention . It is a top view of another flat elastic washer concerning the present invention . It is a top view of the conventional flat elastic washer.

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

1 to 9 show a locking nut as a reference example provided with a basic structure of a locking nut according to the present invention . As shown in FIGS. 1 and 2, the locking locking nut N has a shaft at the center. A nut main body 1 in which a screw hole 1a penetrating in the direction is formed, and a plate-like elastic washer 2 crimped to the upper surface of the nut main body 1 are provided. 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) 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.

  Of the first and second convex engaging part pieces 21, 22, one first convex engaging part piece 21 has an angle of 180 ° larger than the other second convex engaging part piece 22. The other second convex engagement piece 22 is formed as a convex engagement piece with a small arc width and a narrow arc width. . 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.

  The thickness of the flat elastic washer 2 is formed to be thinner than the thickness of the conventional elastic washer, and the convex engagement pieces 21 and 22 can be easily inserted between the bolt threads by hand. Is possible. 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. A 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 caulked and fixed to the bottom surface of the counterbored hole by caulking the peripheral wall of the counterbore. The

The use state of the locking nut of the reference example configured as described above will be described.

  In use, as shown in FIG. 4, the 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. Since the flat elastic washer 2 is caulked and fixed to the upper surface of the locking nut N at the time of the screwing, first, the first concave notch 23 of the flat elastic washer 2 thinned manually is used. Then, the second convex engagement portion piece 22 is searched for the rise of the screw 3a of the bolt 3, and the second convex engagement portion piece 22 is inserted into the screw thread from this rise. 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 plate-like elastic washer to be thin, it is possible to enter it while easily elastically deforming it manually. That is, the work can be remarkably enhanced, the screw thread of the bolt is hardly damaged, and the seizure can be suppressed. In addition, the problem that it cannot be reused can be solved.

  Further, the arc widths of the first convex engagement piece 21 and the second convex engagement piece 22 are not limited to those of the above-described embodiment, and the type and size of the bolt used or Depending on the application and the like, the first convex engaging piece 21 in the flat elastic washer 2 has an arc width in the range of 150 ° to 240 °, and the other second convex engaging piece 22 is 60 ° to 90 °. The first and second concave cutouts 23 and 24 interposed between the first convex engagement piece 21 and the second convex engagement piece 22 are respectively 30. It may be formed by appropriately selecting an arc width in the range of ° to 60 °.

  Specifically, as shown in FIG. 5, 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 notches 23 and 24 is formed to 60 °, or the arc width of the first convex engaging 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 notches 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. 8, 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 cut The arc width of the notches 23 and 24 is formed to 60 °, and the arc width of the first convex engagement piece 21 is increased to 240 ° as shown in FIG. The arc width of the engaging piece 22 may be 60 °, and the arc widths of the first and second concave notches 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, it is possible to more easily perform the locking of the locking nut N into the bolt by hand according to the type, size, or application of the bolt to be used, and to securely exhibit the locking effect of the nut.

Next, the locking nut according to the present invention will be described.
First, the basic configuration is the same as that of the locking nut N of the reference example shown in FIGS. 1 to 4 described above. Although not shown, a screw hole 1a penetrating in the axial direction is formed at the center. An annular caulking portion 11 is provided on the upper end surface of the nut body 1, and a flat elastic washer 2 is caulked and fixed in the caulking portion 11 concentrically with the screw hole 1a as shown in FIG. It has the composition which becomes. (Please refer to FIGS. 1 to 4 because the same reference numerals are given)
Then, on the inner peripheral surface of the elastic washer 2 of the locking nut N configured as described above, two first convex engaging pieces 21 and a second convex shape projecting in the same radial direction inward. The engaging piece 22 and the two first cutout recesses 23 and the second cutout recesses 24 are alternately formed, and the first protruding engagement piece 21 and the second protruding engagement piece 22. The first convex engaging piece 21 has a larger angle than the other second convex engaging piece 22 and is formed into a convex engaging piece 21 having a wide arc width. The two convex engaging pieces 22 are formed in the convex engaging pieces 22 having a small angle and a narrow arc width, and the inner peripheral surfaces of the convex engaging pieces 21 and 22 are screw holes. The inner surface of each notch recess 23 is formed in an arc shape larger in diameter than the valley diameter of the screw hole 1a. Of the first notch recess 23 and the second notch recess 24, one of the notch recesses has a larger angle than the other notch recess and is formed in a notch recess having a larger arc width than the other notch recess. . Thus with the change in the formation position in the circumferential direction of the second convex engaging piece 22 first convex engaging piece 21 with respect to, and reduce the torque during screwing lend active properties due to the formation position Or configured to increase .

  Specifically, for example, as shown in FIG. 10, 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. 11, the arc width of the first convex engagement piece 21 is increased to 150 ° and the arc width of the second convex engagement 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 work can be further enhanced by changing the formation position of the convex engagement piece in a wide range in addition to the angle of the convex engagement piece and the thickness of the flat elastic washer 2 for preventing loosening. This makes it difficult to damage the screw threads of the bolts and suppresses seizure.

  Further, as the thickness of the flat elastic washer 2, for example, if the plate thickness of the 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 If the plate thickness is 0.2 mm, the plate thickness is reduced to 0.15 mm, or if the plate thickness of the conventional flat elastic washer is 0.15 mm, the plate thickness is reduced to 0.1 mm. .

N Locking nut 1 Nut body 1a Screw hole 11 Ring caulking portion 2 Flat elastic washer 21 First convex engagement piece 22 Second convex engagement piece 23 First concave cutout 24 Second concave cutout

Claims (1)

An annular caulking portion is provided on the upper end surface of the nut main body in which a screw hole penetrating in the axial direction is formed in the central portion, and a flat elastic washer is caulked and fixed concentrically with the screw hole inside the caulking portion. , Two first convex engaging pieces, two convex engaging pieces, two first cut-out concave portions, and two first cut-out concave portions projecting on the inner peripheral surface of the elastic washer in a radially inward direction. The two notch recesses are alternately formed, and one of the first convex engagement piece and the second convex engagement piece is one of the second convex engagement pieces. A convex engagement part having a larger angle than the joint piece and formed in a convex engagement part with a wide arc width, and the other second convex engagement part piece having a smaller angle and a narrow arc width. It is formed on one, together with the inner peripheral surface of each convex-like engaging piece is formed in a circular arc shape of substantially the same diameter as the inner diameter of the screw hole, the inner surface of the cutout recess screw Of which is formed into an arc shape having a larger diameter than the root diameter, and, among the first cutout recess and a second cutout recesses, one cutout recess either takes larger angle than the other cutout recess, the other than the cutout concave portion is formed in a wide cutout recess of the arc width, thereby with a change in the formation position of the first convex engaging piece to the second convex engaging piece, the torque during screwing A locking nut characterized in that it is reduced or increased .

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