JP2022073683A - Washer and fastening structure - Google Patents

Abstract

To eliminate burrs of a washer.SOLUTION: In a fastening structure 10, a front-side surface 20A of a washer 20 is pressed by a nut 18, and a fastening plate 16 is held between a rear-side surface 20B of the washer 20 and a mounting plate 12. Here, the washer 20 is provided with C-surfaces 20G formed on a corner portion between an outer peripheral surface 20C and the front-side surface 20A, a corner portion between the outer peripheral surface 20C and the rear-side surface 20B, a corner portion between an inner peripheral surface 20D and the front-side surface 20D, and a corner portion between the inner peripheral surface 20D and the rear-side surface 20B . Thus burrs 20F of the washer 20 can be eliminated.SELECTED DRAWING: Figure 1

Description

The present invention relates to a washer in which a second fastening object is sandwiched between the first fastening object and a fastening structure including the washer.

The thrust washer described in Patent Document 1 below is formed in the shape of an annular plate.

Here, this thrust washer is formed by punching from the front side, and is a corner portion between the outer peripheral surface and the back side surface of the thrust washer and a corner portion between the inner peripheral surface and the back side surface of the thrust washer. A burr is formed in.

Japanese Unexamined Patent Publication No. 2019-32031

In consideration of the above facts, an object of the present invention is to obtain a washer capable of eliminating burrs and a fastening structure provided with the washer.

In the washer of the first aspect of the present invention, the second fastening object is sandwiched between the front surface surface pressed by the fastening member and the first fastening object, and the first fastening object and the second fastening object are fastened. The back side surface, the corner portion between the outer peripheral surface and the front side surface, the corner portion between the outer peripheral surface and the back side surface, the corner portion between the inner peripheral surface and the front side surface, and the inner circumference. It includes a corner portion between the surface and the back surface, and an inclined surface provided on at least one of the surfaces.

In the washer of the second aspect of the present invention, the inclined surface is provided in the entire circumferential direction in the washer of the first aspect of the present invention.

The washer according to the third aspect of the present invention has a shape symmetrical with respect to the plane of symmetry between the front side surface and the back side surface in the washer according to the first aspect or the second aspect of the present invention.

The fastening structure of the fourth aspect of the present invention has a corner portion between the outer peripheral surface and the front surface surface, a corner portion between the outer peripheral surface and the back surface surface, and a corner portion between the inner peripheral surface and the front surface surface. A washer provided with an inclined surface on at least one of a corner portion between the inner peripheral surface and the back surface, a fastening member for pressing the front surface, and a washer arranged on the back surface side of the washer. A first fastening target and a second fastening target sandwiched between the back surface surface and the first fastening target and fastened to the first fastening target are provided.

In the washer of the first aspect of the present invention, the fastening member presses the front surface surface, and the second fastening object is sandwiched between the back surface surface and the first fastening object, so that the first fastening object and the second fastening object are formed. Is concluded.

Here, in the washer, the corner portion between the outer peripheral surface and the front surface surface, the corner portion between the outer peripheral surface and the back surface surface, and the corner portion between the inner peripheral surface and the front surface surface, and the inner peripheral surface and the back surface surface. An inclined surface is provided on at least one of the corners between and. Therefore, the washer burr can be eliminated.

In the washer of the second aspect of the present invention, an inclined surface is provided in the entire circumferential direction. Therefore, the burr of the washer can be effectively eliminated.

The washer of the third aspect of the present invention has a shape symmetrical with respect to the plane of symmetry between the front side surface and the back side surface. Therefore, even when the front side surface is arranged on the second fastening target side and the back side surface is arranged on the fastening member side, the configuration can be the same.

In the fastening structure of the fourth aspect of the present invention, the fastening member presses the front surface surface of the washer, and the second fastening object is sandwiched between the back surface surface of the washer and the first fastening object to form the first fastening object. The second fastening target is fastened.

Here, in the washer, the corner portion between the outer peripheral surface and the front surface surface, the corner portion between the outer peripheral surface and the back surface surface, and the corner portion and the inner peripheral surface between the inner peripheral surface and the front surface surface of the washer. An inclined surface is provided on at least one of the corners between the back surface and the back surface. Therefore, the washer burr can be eliminated.

It is sectional drawing which shows the fastening structure which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the time of formation by the punching process of a washer. (A) is a cross-sectional view showing a washer of the first embodiment of the present invention, (B) is a cross-sectional view showing a washer of the second embodiment of the present invention, and (C) is a cross-sectional view of the present invention. It is sectional drawing which shows the washer of 3rd Embodiment. (A) is a sectional view which shows the washer of the 4th Embodiment of this invention, and (B) is a sectional view which shows the washer of 5th Embodiment of this invention. (A) is a sectional view which shows the washer of the 6th Embodiment of this invention, and (B) is a sectional view which shows the washer of the 7th embodiment of this invention. (A) is a sectional view which shows the washer of the 8th Embodiment of this invention, and (B) is a sectional view which shows the washer of the 9th embodiment of this invention.

[First Embodiment]
FIG. 1 shows a cross-sectional view of the fastening structure 10 according to the first embodiment of the present invention. In the drawings, one side of the fastening structure 10 is indicated by an arrow A, and the other side of the fastening structure 10 is indicated by an arrow B.

As shown in FIG. 1, the fastening structure 10 according to the present embodiment is provided with a plate-shaped mounting plate 12 as a first fastening target, and the mounting plate 12 is, for example, various machines (moving means such as an automobile). Is installed in). Further, a circular mounting hole 12A as a first hole is formed through the mounting plate 12.

The mounting plate 12 is provided with a bolt 14 as a fastening partner. A disk-shaped or polygonal plate-shaped head 14A as a pressing portion is coaxially provided on the other side of the bolt 14, and the head 14A is fixed (for example, welded) to the other side of the mounting plate 12. At the same time, it is arranged coaxially with the mounting hole 12A of the mounting plate 12. A substantially columnar leg portion 14B is coaxially provided on one side of the bolt 14, and the leg portion 14B extends from the head portion 14A to one side and penetrates and fits into the mounting hole 12A. ing. Further, a male screw 14C is formed on the outer peripheral surface of the leg portion 14B.

A plate-shaped fastening plate 16 as a second fastening target is provided on one side of the mounting plate 12. A circular fastening hole 16A as a second hole is formed through the fastening plate 16, and the fastening hole 16A is arranged coaxially with the mounting hole 12A of the mounting plate 12, and the leg portion of the bolt 14 is formed. 14B is penetrated and fitted.

A cylindrical nut 18 as a fastening member is provided on one side of the fastening plate 16. The outer circumference of the nut 18 has a polygonal shape, and a female screw (not shown) is formed on the inner peripheral surface of the nut 18. The female screw is screwed with the male screw 14C of the bolt 14 (leg portion 14B), and the leg portion 14B is penetrated in the nut 18.

A washer 20 (washer) having a substantially annular plate shape is provided between the fastening plate 16 and the nut 18, and the leg portion 14B of the bolt 14 is penetrated and fitted in the washer 20. One side surface and the other side surface of the washer 20 are formed on the front side surface 20A and the back side surface 20B, respectively, and the front side surface 20A and the back side surface 20B are arranged on the nut 18 side and the fastening plate 16 side, respectively. As described above, the male screw 14C of the bolt 14 and the female screw of the nut 18 are screwed together, and the mounting plate 12, the fastening plate 16 and the washer 20 are sandwiched between the head 14A of the bolt 14 and the nut 18. The mounting plate 12 and the fastening plate 16 are fastened to each other, and the front side surface 20A of the washer 20 is pressed to the other side by the nut 18, and the fastening plate 16 is between the back side surface 20B of the washer 20 and the mounting plate 12. Is sandwiched.

The washer 20 is manufactured by pressing a metal plate material.

In this press working, first, a punching step from the front side of the metal plate material is performed to form the washer 20 in a substantially annular plate shape (see FIG. 2). As a result, a sagging surface 20E is formed in the entire circumferential direction at the corner portion between the outer peripheral surface 20C and the front side surface 20A of the washer 20 and the corner portion between the inner peripheral surface 20D and the front surface surface 20A of the washer 20. Therefore, the cross section of the sagging surface 20E perpendicular to the 20-circumferential direction of the washer is formed into a convex curved line. Further, burrs 20F are formed so as to protrude in the entire circumferential direction at the corner portion between the outer peripheral surface 20C and the back side surface 20B of the washer 20 and the corner portion between the inner peripheral surface 20D and the back side surface 20B of the washer 20. To.

Next, the surface pressing step of the washer 20 is performed (see FIG. 3A). As a result, the corner portion between the outer peripheral surface 20C and the front side surface 20A of the washer 20, the corner portion between the outer peripheral surface 20C and the back side surface 20B of the washer 20, and the inner peripheral surface 20D and the front side surface 20A of the washer 20. The C surface 20G as an inclined surface is uniformly formed at the corner portion between the corners and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire peripheral direction. The C surface 20G on the outer peripheral side of the washer 20 is inclined in the axially inward direction of the washer 20 toward the outer peripheral side of the washer 20, and the C surface 20G on the inner peripheral side of the washer 20 is inside the washer 20. The washer 20 is inclined inward in the axial direction toward the circumferential side. The cross section of the C surface 20G perpendicular to the washer 20 circumferential direction is a straight line, and is between the C surface 20G and the front side surface 20A, the back side surface 20B, the outer peripheral surface 20C, or the inner peripheral surface 20D adjacent to the C surface 20G. The angles of are all set to 135 °. The dimension L1 (depth dimension) in the washer 20 axis direction of the C surface 20G is all the same, and the washer 20 is shaped to be plane symmetric with respect to the symmetry plane S perpendicular to the axial direction in the center of the axial direction. ing.

Next, the operation of this embodiment will be described.

In the fastening structure 10 having the above configuration, the mounting plate 12 and the fastening plate 16 are fastened by the bolt 14 and the nut 18, and the front side surface 20A of the washer 20 is pressed to the other side by the nut 18 to the back side of the washer 20. The fastening plate 16 is sandwiched between the surface 20B and the mounting plate 12.

Here, in the washer 20, the corner portion between the outer peripheral surface 20C and the front side surface 20A, the corner portion between the outer peripheral surface 20C and the back side surface 20B, and the corner portion between the inner peripheral surface 20D and the front side surface 20A. Further, a C surface 20G is formed at a corner portion between the inner peripheral surface 20D and the back surface surface 20B. Therefore, the burr 20F of the washer 20 can be eliminated, and it is possible to prevent the burr 20F from damaging the fingers when assembling the fastening structure 10.

Further, a C surface 20G is formed in the entire circumferential direction of the washer 20. Therefore, the burr 20F of the washer 20 can be effectively eliminated. As a result, unlike the case where the back side of the washer 20 with the burr 20F needs to be arranged on the fastening plate 16 side, for example, when assembling the fastening structure 10 (especially when working with point lighting in a dark place at night). It is possible to eliminate the need to check the front side and the back side of the washer 20, improve the assembly workability of the fastening structure 10, and shorten the assembly time of the fastening structure 10. Moreover, when the mounting plate 12 and the fastening plate 16 are fastened with the bolts 14 and nuts 18, the fastening plate 16 (for example, a surface treatment layer such as plating and painting of the fastening plate 16) can be prevented from being damaged by the burr 20F. It is possible to prevent the machine in which the fastening structure 10 is installed from causing a problem due to the mixing of the burr 20F peeled from the washer 20.

Further, the washer 20 has a shape symmetrical with respect to the plane of symmetry S. Therefore, even when the front side surface 20A of the washer 20 is arranged on the fastening plate 16 side and the back side surface 20B of the washer 20 is arranged on the nut 18 side, the configuration of the fastening structure 10 can be the same. This makes it possible to effectively eliminate the need to check the front side and the back side of the washer 20 when assembling the fastening structure 10.

Further, the C surface 20G of the washer 20 is formed by the surface pressing step of the press working. Therefore, the C surface 20G can be formed on the washer 20 in the press working process, and the C surface 20G can be easily formed on the washer 20.

[Second Embodiment]
FIG. 3B shows a cross-sectional view of the washer 20 of the fastening structure 30 according to the second embodiment of the present invention.

The fastening structure 30 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 3B, in the fastening structure 30 according to the present embodiment, the outer peripheral surface 20C of the washer 20 is a corner portion between the outer peripheral surface 20C of the washer 20 and the front surface surface 20A due to the surface pushing step of the washer 20. At the corner between the washer 20 and the inner peripheral surface 20D of the washer 20 and the front side surface 20A, and at the corner between the inner peripheral surface 20D and the back surface 20B of the washer 20. The R surface 20H as an inclined surface is uniformly formed in the entire peripheral direction. The R surface 20H on the outer peripheral side of the washer 20 is inclined in the axially inward direction of the washer 20 toward the outer peripheral side of the washer 20, and the R surface 20H on the inner peripheral side of the washer 20 is inside the washer 20. The washer 20 is inclined inward in the axial direction toward the circumferential side. The cross section of the R surface 20H perpendicular to the washer 20 circumferential direction is a convex curved line (particularly an arc), and the front side surface 20A, the back side surface 20B, and the outer peripheral surface 20C adjacent to the R surface 20H and the R surface 20H are formed. Alternatively, the inner peripheral surface 20D is all smoothly continuous. The dimension L2 (depth dimension) in the washer 20 axis direction of the R surface 20H is all the same, and the washer 20 is shaped to be plane symmetric with respect to the symmetry plane S perpendicular to the axial direction in the center of the axial direction. ing.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

In the present embodiment, by the surface pushing step of the washer 20, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the corner portion between the inner peripheral surface 20D and the front side surface 20A of the washer 20 are formed. The R surface 20H is formed. However, at the corner between the outer peripheral surface 20C and the front side surface 20A of the washer 20 and the corner portion between the inner peripheral surface 20D and the front side surface 20A of the washer 20, the surface pressing step of the washer 20 is not performed and the washer 20 is sagging. The surface 20E may be the R surface 20H.

[Third Embodiment]
FIG. 3C shows a cross-sectional view of the washer 20 of the fastening structure 40 according to the third embodiment of the present invention.

The fastening structure 40 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 3C, in the fastening structure 40 according to the present embodiment, the outer peripheral surface 20C of the washer 20 is a corner portion between the outer peripheral surface 20C of the washer 20 and the front surface surface 20A due to the surface pressing step of the washer 20. At the corner between the washer 20 and the inner peripheral surface 20D of the washer 20 and the front side surface 20A, and at the corner between the inner peripheral surface 20D and the back surface 20B of the washer 20. The square surface 20I as an inclined surface is uniformly formed in the entire peripheral direction. The corner surface 20I on the outer peripheral side of the washer 20 is inclined in the direction toward the inside in the axial direction of the washer 20 toward the outer peripheral side of the washer 20, and the corner surface 20I on the inner peripheral side of the washer 20 is inside the washer 20. The washer 20 is inclined inward in the axial direction toward the circumferential side. The cross section of the corner surface 20I perpendicular to the washer 20 circumference direction is a straight line, and the angle between the corner surface 20I and the front side surface 20A or the back side surface 20B adjacent to the corner surface 20I is all larger than 135 °. The angles are the same, and the angles between the corner surface 20I and the outer peripheral surface 20C or the inner peripheral surface 20D adjacent to the corner surface 20I are all set to the same angle smaller than 135 °. The dimension L3 (depth dimension) of the square surface 20I in the washer 20 axial direction is all the same, and the washer 20 is shaped to be plane symmetric with respect to the symmetrical plane S perpendicular to the axial direction in the center of the axial direction. ing.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

[Fourth Embodiment]
FIG. 4A shows a cross-sectional view of the washer 20 of the fastening structure 50 according to the fourth embodiment of the present invention.

The fastening structure 50 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 4A, in the fastening structure 50 according to the present embodiment, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the outer circumference of the washer 20 are formed by the surface pressing step of the washer 20. At the corner between the surface 20C and the back side surface 20B, the C surface 20G similar to that of the first embodiment is uniformly formed in the entire circumferential direction, and the inner peripheral surface 20D and the front side surface 20A of the washer 20 are uniformly formed. The same R surface 20H as in the second embodiment is uniformly formed in the corner portion between the washer 20 and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire circumferential direction. ing. The dimension L1 (depth dimension) in the washer 20 axis direction of the C surface 20G and the dimension L2 (depth dimension) in the washer 20 axis direction of the R surface 20H are all the same, and the washer 20 is in the center in the axial direction. The shape is plane-symmetrical with respect to the plane of symmetry S perpendicular to the axial direction of.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

[Fifth Embodiment]
FIG. 4B shows a cross-sectional view of the washer 20 of the fastening structure 60 according to the fifth embodiment of the present invention.

The fastening structure 60 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 4B, in the fastening structure 60 according to the present embodiment, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the outer circumference of the washer 20 are formed by the surface pressing step of the washer 20. At the corner between the surface 20C and the back side surface 20B, the C surface 20G similar to that of the first embodiment is uniformly formed in the entire circumferential direction, and the inner peripheral surface 20D and the front side surface 20A of the washer 20 are uniformly formed. The same corner surface 20I as in the third embodiment is uniformly formed in the corner portion between the washer 20 and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire circumferential direction. ing. The dimension L1 (depth dimension) in the washer 20 axis direction of the C surface 20G and the dimension L3 (depth dimension) in the washer 20 axis direction of the square surface 20I are all the same, and the washer 20 is in the center in the axial direction. The shape is plane-symmetrical with respect to the plane of symmetry S perpendicular to the axial direction of.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

[Sixth Embodiment]
FIG. 5A shows a cross-sectional view of the washer 20 of the fastening structure 70 according to the sixth embodiment of the present invention.

The fastening structure 70 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 5A, in the fastening structure 70 according to the present embodiment, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the outer circumference of the washer 20 are formed by the surface pushing step of the washer 20. The same R surface 20H as in the second embodiment is uniformly formed at the corner between the surface 20C and the back side surface 20B in the entire circumferential direction, and the inner peripheral surface 20D and the front side surface 20A of the washer 20 are uniformly formed. The same C surface 20G as in the first embodiment is uniformly formed in the corner portion between the washer 20 and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire circumferential direction. ing. The dimension L2 (depth dimension) in the washer 20 axis direction of the R surface 20H and the dimension L1 (depth dimension) in the washer 20 axis direction of the C surface 20G are all the same, and the washer 20 is in the center in the axial direction. The shape is plane-symmetrical with respect to the plane of symmetry S perpendicular to the axial direction of.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

[7th Embodiment]
FIG. 5B shows a cross-sectional view of the washer 20 of the fastening structure 80 according to the seventh embodiment of the present invention.

The fastening structure 80 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 5B, in the fastening structure 80 according to the present embodiment, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the outer circumference of the washer 20 are formed by the surface pressing step of the washer 20. The same R surface 20H as in the second embodiment is uniformly formed at the corner between the surface 20C and the back side surface 20B in the entire circumferential direction, and the inner peripheral surface 20D and the front side surface 20A of the washer 20 are uniformly formed. The same corner surface 20I as in the third embodiment is uniformly formed in the corner portion between the washer 20 and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire circumferential direction. ing. The dimension L2 (depth dimension) of the washer 20 axis direction of the R surface 20H and the dimension L3 (depth dimension) of the washer 20 axis direction of the square surface 20I are all the same, and the washer 20 is the center in the axial direction. The shape is plane-symmetrical with respect to the plane of symmetry S perpendicular to the axial direction of.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

[Eighth Embodiment]
FIG. 6A shows a cross-sectional view of the washer 20 of the fastening structure 90 according to the eighth embodiment of the present invention.

The fastening structure 90 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 6A, in the fastening structure 90 according to the present embodiment, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the outer circumference of the washer 20 are formed by the surface pressing step of the washer 20. At the corners between the surface 20C and the back side surface 20B, the same corner surface 20I as in the third embodiment is uniformly formed in the entire circumferential direction, and the inner peripheral surface 20D and the front side surface 20A of the washer 20 are uniformly formed. The same R surface 20H as in the second embodiment is uniformly formed in the corner portion between the washer 20 and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire circumferential direction. ing. The dimension L3 (depth dimension) of the washer 20 axis of the square surface 20I and the dimension L2 (depth dimension) of the washer 20 axis direction of the R surface 20H are all the same, and the washer 20 is the center in the axial direction. The shape is plane-symmetrical with respect to the plane of symmetry S perpendicular to the axial direction of.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

[9th Embodiment]
FIG. 6B shows a cross-sectional view of the washer 20 of the fastening structure 100 according to the ninth embodiment of the present invention.

The fastening structure 100 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

As shown in FIG. 6B, in the fastening structure 100 according to the present embodiment, the corner portion between the outer peripheral surface 20C of the washer 20 and the front side surface 20A and the outer circumference of the washer 20 are formed by the surface pressing step of the washer 20. At the corners between the surface 20C and the back side surface 20B, the same corner surface 20I as in the third embodiment is uniformly formed in the entire circumferential direction, and the inner peripheral surface 20D and the front side surface 20A of the washer 20 are uniformly formed. The same C surface 20G as in the first embodiment is uniformly formed in the corner portion between the washer 20 and the corner portion between the inner peripheral surface 20D and the back surface 20B of the washer 20 in the entire circumferential direction. ing. The dimension L3 (depth dimension) of the washer 20 axis of the square surface 20I and the dimension L1 (depth dimension) of the washer 20 axis direction of the C surface 20G are all the same, and the washer 20 is the center in the axial direction. The shape is plane-symmetrical with respect to the plane of symmetry S perpendicular to the axial direction of.

Here, also in this embodiment, the same actions and effects as those in the first embodiment can be obtained.

In the first to ninth embodiments, the washer 20 has a shape symmetrical with respect to the plane of symmetry S. However, the washer 20 does not have to have a shape symmetrical with respect to the plane of symmetry S.

Further, in the first embodiment, the fourth embodiment to the sixth embodiment, and the ninth embodiment, the dimensions L1 of the C surface 20G in the washer 20 axis direction are all the same. However, the dimension L1 of the C surface 20G in the washer 20 axis direction may be different from each other.

Further, in the second embodiment, the fourth embodiment, and the sixth to eighth embodiments, the dimensions L2 of the R surface 20H in the washer 20 axis direction are all the same. However, the dimensions L2 of the R surface 20H in the washer 20 axis direction may be different from each other.

Further, in the third embodiment, the fifth embodiment, and the seventh to ninth embodiments, the dimensions L3 of the square surface 20I in the washer 20 axis direction are all the same. However, the dimensions L3 of the square surface 20I in the washer 20 axis direction may be different from each other.

Further, in the first to ninth embodiments, the corner portion between the outer peripheral surface 20C and the front side surface 20A of the washer 20 and the corner portion between the outer peripheral surface 20C and the back side surface 20B of the washer 20 are the same. The corner portion between the inner peripheral surface 20D and the front side surface 20A of the washer 20 and the corner portion between the inner peripheral surface 20D and the back side surface 20B of the washer 20 are made to be the same inclined surface. Will be done. However, the corner portion between the outer peripheral surface 20C and the front side surface 20A of the washer 20 and the corner portion between the outer peripheral surface 20C and the back side surface 20B of the washer 20 may have different inclined surfaces, and the inside of the washer 20 may be formed. The corner portion between the peripheral surface 20D and the front side surface 20A and the corner portion between the inner peripheral surface 20D of the washer 20 and the back surface surface 20B may be differently inclined surfaces.

Further, in the first to ninth embodiments, the corner portion between the outer peripheral surface 20C and the front side surface 20A of the washer 20, the corner portion between the outer peripheral surface 20C and the back side surface 20B of the washer 20, and the washer. Inclined surfaces are provided on both the corner portion between the inner peripheral surface 20D of 20 and the front side surface 20A and the corner portion between the inner peripheral surface 20D and the back side surface 20B of the washer 20. However, the corner portion between the outer peripheral surface 20C and the front side surface 20A of the washer 20, the corner portion between the outer peripheral surface 20C and the back side surface 20B of the washer 20, and the inner peripheral surface 20D and the front side surface 20A of the washer 20. An inclined surface may be provided on one of the corner portion between the corners and the corner portion between the inner peripheral surface 20D of the washer 20 and the back surface 20B.

Further, in the first to ninth embodiments, the washer 20 is sandwiched between the nut 18 and the fastening plate 16. However, the washer 20 may be sandwiched between the head portion 14A of the bolt 14 (fastening member) and the mounting plate 12 (second fastening target).

10 Fastening structure 12 Mounting plate (1st fastening target)
16 Fastening plate (second fastening target)
18 Nut (fastening member)
20 Washer 20A Front side surface 20B Back side surface 20C Outer peripheral surface 20D Inner peripheral surface 20G C surface (inclined surface)
20HR surface (inclined surface)
20I Square surface (inclined surface)
30 Fastening structure 40 Fastening structure 50 Fastening structure 60 Fastening structure 70 Fastening structure 80 Fastening structure 90 Fastening structure 100 Fastening structure

Claims (4)

The front side surface pressed by the fastening member and
The back surface where the second fastening target is sandwiched between the first fastening target and the first fastening target and the second fastening target are fastened.
A corner portion between the outer peripheral surface and the front surface surface, a corner portion between the outer peripheral surface and the back surface surface, a corner portion between the inner peripheral surface and the front surface surface, and the inner peripheral surface and the back surface surface. An inclined surface provided on at least one of the corners between and
A washer equipped with. The washer according to claim 1, wherein the inclined surface is provided in the entire circumferential direction. The washer according to claim 1 or 2, which has a shape symmetrical with respect to the plane of symmetry between the front side surface and the back side surface. A corner portion between the outer peripheral surface and the front surface surface, a corner portion between the outer peripheral surface and the back surface surface, a corner portion between the inner peripheral surface and the front surface surface, and the inner peripheral surface and the back surface surface. A washer with an inclined surface on at least one of the corners between
A fastening member that presses the front side surface and
With the first fastening target arranged on the back side surface side of the washer,
A second fastening object sandwiched between the back surface and the first fastening object and fastened to the first fastening object.
Fastening structure.

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