JP2011252573A - Locking washer and locking fastener using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking washer capable of being fastened in a small number of processes and successfully achieving a high locking effect and a locking fastener using the same.SOLUTION: The locking washer 1, which is fastened with a locking nut 2 formed with a tapered circular inclined depression 22 on the seating surface side, includes a washer hole 11 in which a threaded shaft 4 is inserted, a circular arc-shaped inclined projection 12 formed along the washer hole 11 in a circular arc-shape and in a projected and tapered shape an outer circumferential surface diameter reduced in the projecting direction, and a thread groove engagement portion 13 formed along the inner circumference of the circular arc-shaped inclined projection 12 to be engaged with the thread groove of the threaded shaft 4.

Description

  The present invention relates to a locking washer that exhibits a high locking effect and a locking fastener using the same.

  Conventionally, a locking nut that has a locking effect has been proposed. For example, a lock nut described in Japanese Utility Model Publication No. 50-36123 is composed of an upper nut and a lower nut each having a tapered convex portion and a concave portion that are fitted to each other (Patent Document 1). And the center of the convex part or recessed part of both nuts is eccentric with respect to the axial center line of a fastening bolt. Accordingly, when the upper and lower nuts are tightened, the convex portion and the concave portion come into contact with each other to generate a radial shearing force on the screw shaft, thereby exhibiting a loosening prevention effect.

  Further, in the locking nut described in Japanese Patent Application Laid-Open No. 2002-195236, an abutting portion projects from a position below the side surface of the upper nut (Patent Document 2). Since the tightening tool comes into contact with the contact portion, it is supposed that the rotation of the upper nut can be visually recognized by the position of the contact portion while preventing the lower nut from rotating together.

  Furthermore, the fastening structure for preventing loosening described in Japanese Patent Application Laid-Open No. 2005-69347 includes a nut, a bolt, and a washer, and the contact portion between the nut and the washer is more loosened than when it is fastened. A rotation resistance portion that increases the force required for rotation is provided (Patent Document 3).

Japanese Utility Model Publication No. 50-36123 JP 2002-195236 A JP 2005-69347 A

  However, in the conventional locking nuts including the upper and lower nuts including the inventions described in Patent Document 1 and Patent Document 2, the upper nut must be further tightened after the lower nut is tightened, and the work process is two. It becomes a process. In addition, in each process, since proper torque management is required, there is a problem that it takes a considerable time and the work efficiency is poor.

  Further, since the conventional locking nuts are tightened with the upper nut and the lower nut stacked one above the other, a large space in the axial direction is required for mounting. For this reason, the place where it is attached is limited, and there is a problem that it is difficult to work in a place where the work space is small or that fastening work cannot be performed.

  Furthermore, the locking nut described in Patent Document 2 has a high manufacturing cost because the contact portion projects from the upper nut. Moreover, since the contact portion of the upper nut protrudes from the side portion of the lower nut even after fastening, the appearance is impaired.

  Further, in the fastening structure described in Patent Document 3, when the nut is tightened, the inner peripheral edge portion of the washer hole bites into the bolt shaft. For this reason, once fastened, it is difficult to remove. Even if it can be removed, the deformed washer cannot be reused, which is not preferable from the viewpoint of resource saving.

  The present invention has been made to solve such problems, and is capable of fastening with a small number of work steps, and can provide a high locking effect and a locking fastener using the same. The purpose is to provide.

  The locking washer according to the present invention is a locking locking washer that is fastened together with a locking nut having a tapered circular inclined recess formed on the seat surface side, and is equipped with a washer hole through which a screw shaft is inserted, and along the washer hole. Arc-shaped and convex, and the outer peripheral surface of the circular-arc-shaped inclined convex portion formed in a tapered shape whose diameter decreases in the convex direction, and the screw formed along the inner periphery of the circular-arc-shaped inclined convex portion. A thread groove engaging portion that engages along the thread groove of the shaft.

  Moreover, as an aspect of the locking washer according to the present invention, the arcuate inclined convex portion may be formed within a subarc arc along the washer hole.

  Moreover, the locking fastener according to the present invention is constituted by the locking washer according to claim 1 and the locking nut.

  According to the present invention, it can be fastened with a small number of work steps, and a high locking effect can be achieved.

It is a perspective view showing one embodiment of (a) a locking nut and (b) a locking washer according to the present invention. It is a top view which shows (a) locking nut of this embodiment, and (b) locking stopper washer. It is the (a) 3A-3A sectional view taken on the line in FIG. 2, and (b) 3B-3B sectional view taken on the line. In this embodiment, (a) It is sectional drawing which shows the state which penetrated the locking washer to the screw shaft, and (b) the state which tightened the locking nut. It is (a) perspective view, (b) top view, and (c) 5C-5C sectional view taken on the line in FIG.5 (b) which show other embodiment of the locking washer based on this invention.

  Hereinafter, embodiments of a locking washer 1 and a locking fastener 3 using the same will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the loosening prevention fastener 3 of the present embodiment mainly includes a locking nut 2 and a loosening prevention washer 1 that is fastened together with the locking nut 2. Hereinafter, each component will be described in detail.

  The locking nut 2 is fastened together with the locking washer 1 to exhibit a locking function. In this embodiment, the locking nut 2 is formed in a hexagonal nut shape as shown in FIGS. 1 (a) and 2 (a), and has a screw hole 21 to be screwed with a screw shaft 4 such as a bolt. is doing. Further, a circular inclined concave portion 22 concentric with the screw hole 21 is formed in a concave shape on the seating surface side of the locking nut 2. As shown in FIG. 3A, the circular inclined recess 22 is formed in a tapered shape whose inner peripheral surface is reduced in diameter upward.

  On the other hand, as shown in FIGS. 1B, 2B and 3B, the locking washer 1 is formed in a flat washer shape, and is mainly a washer hole 11 through which the screw shaft 4 is inserted. And an arc-shaped inclined convex portion 12 provided along the washer hole 11 and a thread groove engaging portion 13 formed along the inner periphery of the arc-shaped inclined convex portion 12.

  The washer hole 11 is for inserting the screw shaft 4 screwed into the screw hole 21 of the locking nut 2. In the present embodiment, as shown in FIG. 2B, the thread groove engaging portion 13 is formed along the washer hole 11 with the axis C as the center. Therefore, in the present embodiment, in order to allow the screw shaft 4 to be inserted through the washer hole 11 without being obstructed by the screw groove engaging portion 13, as shown in FIG. , It is formed at a position eccentric to the opposite side of the arcuate inclined convex portion 12 with respect to the axis C.

  The shape of the washer hole 11 is not limited to the above-described configuration, and may be any as long as the washer hole 11 can be inserted through the screw shaft 4 without being caught by the thread groove engaging portion 13. For example, the center C1 of the washer hole 11 may be aligned with the axis C and may be formed with a slightly larger inner diameter.

  The arc-shaped inclined convex portion 12 of the locking washer 1 cooperates with the circular inclined concave portion 22 of the locking nut 2 to generate a shearing force in the radial direction on the screw shaft 4 to generate a locking function. In the present embodiment, the arc-shaped inclined convex portion 12 is formed in an arc shape and a convex shape along the washer hole 11, as shown in FIGS. 1B, 2B, and 3B. The outer peripheral surface is formed in a taper shape whose diameter is reduced in the convex direction.

  Further, in the present embodiment, the arc-shaped inclined convex portion 12 is formed within a range of an arc smaller than the semicircle of the washer hole 11 as shown in FIG. . If it is in the range of a subarc, it can be inserted without screwing into the screw shaft 4 and screwed from the side when tightened with the locking nut 2. In addition, it is more preferable to form the circular arc length of the circular-arc-shaped inclined convex part 12 in the circular arc length slightly shorter than a semicircle. This is because the surface in contact with the locking nut 2 and the screw shaft 4 can be enlarged, and the locking effect can be enhanced.

  In the present embodiment, the arc-shaped inclined convex portion 12 has an outer peripheral surface on the upper end side that is formed with a smaller diameter than the circular inclined concave portion 22 and becomes larger in diameter than the circular inclined concave portion 22 toward the lower end. The diameter has been expanded. For this reason, the arc-shaped inclined convex portion 12 is easy to fit into the circular inclined concave portion 22, and generates a shearing force in the radial direction (direction perpendicular to the axis) between the circular inclined concave portion 22 and the circular inclined concave portion 22 as it is fitted therein. It has become.

  The thread groove engaging portion 13 plays a role of preventing the locking nut 2 from being locked during tightening and preventing the screw shaft 4 from being damaged. In the present embodiment, the thread groove engaging portion 13 is provided in the form of a female screw on the inner peripheral surface of the arc-shaped inclined convex portion 12, and the winding direction, the shape of the thread groove, the diameter, and the pitch are the locking nut 2. Are formed substantially the same as the screw hole 21. This prevents the thread groove engaging portion 13 from engaging and locking along the thread groove of the screw shaft 4 when the locking washer 1 is tightened with the locking nut 2, and the thread groove is deformed or the like. To prevent damage.

  In the present embodiment, the thread groove engaging portion 13 is formed in a female screw shape in consideration of the strength of the arc-shaped inclined convex portion 12. However, the thread groove engaging portion 13 may be formed in another shape as long as it is formed along the inner periphery of the arc-shaped inclined convex portion 12 and engages along the thread groove of the screw shaft 4. . With such a shape, since the thread groove engaging portion 13 slides along the thread groove, there is no possibility of crushing the thread, and the locking nut 2 is prevented from being locked during tightening. .

  Moreover, in this embodiment, since the locking washer 1 is manufactured quickly and inexpensively by pressing, the inner peripheral surface of the arc-shaped inclined convex portion 12 is formed in a tapered shape. However, the manufacturing method is not limited to pressing, and manufacturing by cutting, powder metallurgy, injection with various materials, or the like is also possible. In these cases, the inner peripheral surface of the arc-shaped inclined convex portion 12 is: It does not have to be tapered.

  Next, operations of the locking washer 1 of the present embodiment having the above-described configuration and the locking fastener 3 using the same will be described with reference to the drawings.

  In the present embodiment, as shown in FIG. 4, a case where the loosening prevention fastener 3 of the present embodiment is fastened to the screw shaft 4 inserted through the fastening member 5 and the fastened member 6 will be described.

  First, as shown in FIG. 4A, the locking washer 1 is inserted through the screw shaft 4 with the arcuate inclined convex portion 12 facing upward. At this time, since the washer hole 11 is inserted through the screw shaft 4 at once, it can be inserted quickly and easily until the locking washer 1 comes into contact with the member to be fastened 6 without being caught by the thread groove engaging portion 13. Further, unlike the conventional locking nut composed of two upper and lower nuts, the tightening operation of the lower nut is unnecessary, so that the operation time is shortened and the workability is improved.

  Next, as shown in FIG. 4A, the locking nut 2 is screwed onto the screw shaft 4 with the circular inclined recess 22 facing downward, and is rotated manually or by a fastening tool or the like. Then, the locking nut 2 is screwed downward to come into contact with the locking washer 1 and the circular inclined concave portion 22 starts to insert the arc-shaped inclined convex portion 12. At this time, the arc-shaped inclined convex portion 12 that is slightly smaller than the circular inclined concave portion 22 is smoothly inserted into the circular inclined concave portion 22.

  Further, when the locking nut 2 is tightened and screwed downward, the circular inclined concave portion 22 is gradually inserted while pressing the arc-shaped inclined convex portion 12 as shown in FIG. At this time, the outer peripheral surface of the arc-shaped inclined convex portion 12 receives a radial pressing force from the inner peripheral surface of the circular inclined concave portion 22, and the inner peripheral surface of the circular inclined concave portion 22 reacts as an arc-shaped inclined convex portion. 12 receives a pressing force in the opposite direction from the outer peripheral surface. Thereby, since the shearing force of radial direction is provided with respect to the screw shaft 4, a high locking effect is exhibited and it continues.

  Further, when the locking nut 2 is tightened, as shown in FIG. 4B, since the thread groove engaging portion 13 is screwed onto the screw shaft 4, the locking nut 2 is prevented from being locked during the tightening. Furthermore, since the female thread-like thread groove engaging portion 13 is in close contact with the male screw of the screw shaft 4 and disperses the radial pressing force, the locking washer 1 and the screw shaft 4 are damaged. To prevent.

According to the locking washer 1 of the present embodiment as described above and the locking fastener 3 using the same, the following effects can be obtained.
1. It can be fastened with a small number of work steps and can maintain a high locking effect.
2. By using the locking washer 1, the size can be reduced, and it can be installed in a narrow space.
3. Breakage of the locking washer 1 and the screw shaft 4 can be prevented and reused repeatedly.
4). Locking during tightening can be prevented and the locking nut 2 can be tightened with a desired torque.
5). It is fastened with the same appearance as a conventional nut and washer fastened, and can have a simple aesthetic appearance.
6). Since the locking washer 1 can be manufactured by press working, it can be mass-produced in a short time and the manufacturing cost can be reduced.

  Next, another embodiment of the locking washer according to the present invention will be described. Note that, among the configurations of the other embodiments, configurations that are the same as or equivalent to the configurations of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

  A feature of the locking washer 1B according to another embodiment is that it is formed in a shape suitable for pressing. Specifically, as shown in FIG. 5, the arc-shaped inclined convex portion 12 is formed so as to protrude by pressing a thin steel plate. The upper end portion of the inner periphery of the arc-shaped inclined convex portion 12 functions as the thread groove engaging portion 13. However, since it is inferior in strength as compared with the locking washer 1 of the above-described embodiment, it is preferable to manufacture with a material having high strength.

  When the locking washer 1B according to another embodiment as described above is tightened with the locking nut 2, the thread groove engaging portion 13 slides along the thread groove of the screw shaft 4. For this reason, similarly to the above-described embodiment, there is no fear of crushing the thread of the screw shaft 4, and the locking nut 2 is prevented from being locked during tightening. Therefore, it is possible to achieve substantially the same operational effects while having a shape more suitable for press working than the embodiment described above.

  In addition, the locking washer 1 and the locking fastener 3 using the same according to the present invention are not limited to the above-described embodiment, and can be appropriately changed.

  For example, in the above-described embodiment, the arc-shaped inclined convex portion 12 is formed to be slightly larger than the circular inclined concave portion 22 and the center thereof is made coincident with the axial center of the locking washer 1, but this is limited to this configuration. It is not a thing. That is, when the locking nut 2 is tightened, the arc-shaped inclined convex portion 12 is formed to be approximately the same size as the circular inclined concave portion 22 as long as a radial shearing force is generated between the circular inclined concave portion 22 and the circular inclined concave portion 22. The center may be decentered from the axis of the locking washer 1.

  In the above-described embodiment, the looseness washer 1 having a circular outer shape has been described. However, the present invention is not limited to this shape. Further, the outer shape of the locking nut 2 is not limited to a hexagonal shape as long as it functions as a nut, and may be a polygonal shape or a circular shape.

1 Locking washer 1B Locking washer (another embodiment)
2 Locking nut 3 Locking fastener 4 Screw shaft 5 Fastening member 6 Fastened member 11 Washer hole 12 Arc-shaped inclined convex portion 13 Screw groove engaging portion 21 Screw hole 22 Circular inclined concave portion C Center axis C1 Center of washer hole

The locking washer according to the present invention is a locking locking washer that is fastened together with a locking nut having a tapered circular inclined recess formed on the seat surface side, and is equipped with a washer hole through which a screw shaft is inserted, and along the washer hole. An arc-shaped inclined convex portion formed in an arc shape and a convex shape within the range of an inferior arc and whose outer peripheral surface is tapered in a convex direction, and along the inner periphery of the arc-shaped inclined convex portion formed possess a thread groove engagement portions which engage along the thread groove of the screw shaft Te, said washer hole configuration in the shape that can be inserted without the screw shaft is caught by the thread groove engagement portion Has been.

As one aspect of the locking washer according to the present invention, the thread groove engaging portion may be formed in a female thread shape that is screwed into the thread groove of the screw shaft .

Moreover, the locking fastener according to the present invention includes the locking washer according to claim 1 or 2 , and the locking nut.

Moreover, the locking fastener according to the present invention is constituted by the locking washer according to claim 1 and the locking nut.

Claims (3)

A locking washer that is fastened together with a locking nut formed with a tapered circular inclined recess on the seat surface side,
A washer hole that passes through the screw shaft, an arc-shaped inclined convex portion that is formed in an arc shape and a convex shape along the washer hole, and whose outer peripheral surface is reduced in diameter in the convex direction, and the arc shape A locking washer having a thread groove engaging portion that is formed along the inner periphery of the inclined convex portion and engages along the thread groove of the screw shaft.   2. The locking washer according to claim 1, wherein the arcuate inclined convex portion is formed within the range of a subarc along the washer hole.   A locking fastener comprising the locking washer according to claim 1 and the locking nut.

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