JPH09217726A - Elastic washer for fastening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase vertical rigidity of an elastic washer formed by layering a sheet shaped topping code, and obviate the need of layering another metal washer at the time of using. SOLUTION: An intermediate plate 12 made of a steel plate is layered on the intermediate part of a reinforcing rubber part 11 made of a plurality of sheet shaped topping codes formed by topping the rubber on multiple reinforcing codes which are formed in parallel, an upper flange 13 and a lower flange 14 which are made of steel plates respectively are layered on the most upper layer and the most lower layer, and those steel plates are integrated by cure sticking with the topping code.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening elastic washer.

[0002]

2. Description of the Related Art An elastic washer having a modulus between a metal washer and a rubber washer and having a wide range of longitudinal rigidity and lateral rigidity can be selected. A plurality of sheet-shaped topping cords obtained by topping rubber on the rubber are singly or alternately laminated with the rubber sheets, and integrated by vulcanization. It is known that they are equally divided in different directions such as 90 degree intervals and 45 degree intervals (see Japanese Utility Model Publication No. 7-8898).

[0003]

The elastic washer formed by stacking the above-mentioned sheet-shaped topping cords adjusts the arrangement density of the reinforcing cords so that the lateral rigidity is hardly changed and only the longitudinal rigidity is adjusted over a wide range. It is possible to set the ratio of longitudinal rigidity to lateral rigidity arbitrarily, but since the metal plate is not used at all, the modulus in the axial direction, that is, the longitudinal rigidity may be insufficient depending on the purpose. . Also, since the upper and lower end surfaces are made of rubber, when actually used, it is necessary to overlap the metal washers on the upper and lower surfaces to prevent the bolt heads and nuts from contacting the rubber, which is troublesome. Since the metal washers of No. 1 are simply overlapped with each other, slippage easily occurs between the metal washers and the surface of the elastic washer, the binding force of the surface of the elastic washer, that is, the pressure receiving surface is reduced, and the rigidity does not increase so much, and There is a problem that stress relaxation easily occurs during use.

The present invention improves the elastic washer formed by stacking the above-mentioned sheet-like topping cords, further increases the vertical rigidity, and eliminates the need for stacking another metal washer or the like.

[0005]

The elastic washer for fastening of the present invention comprises a plurality of sheet-like topping cords obtained by topping rubber on a large number of juxtaposed reinforcing cords. Are 90 degrees apart from above, 4
When stacking so as to be equally distributed in different directions such as 5 ° intervals, an upper flange and a lower flange made of steel sheets are respectively laminated on the uppermost layer and the lowermost layer, and an intermediate plate made of a steel sheet is laminated in the middle. The steel plate of 1 is integrated with the topping cord by vulcanization adhesion.

Since the topping cords are laminated and the adjacent topping cords are in contact with each other by the rubber layer on the surface, the slipperiness between the topping cords, that is, the lateral rigidity is almost the same as that of the layer made of only rubber, and the compressive elasticity in the axial direction, that is, the longitudinal stiffness. Rigidity is intermediate between rubber and metal washers.
Moreover, since the intermediate plate made of a steel plate is interposed between the layers of the topping cords, the longitudinal rigidity, that is, the spring constant in the axial direction is increased as compared with the laminated body having only the topping cords.

Since the upper and lower flanges made of steel plate are vulcanized and adhered to the topping cords of the uppermost layer and the lowermost layer, respectively, the end faces of the topping cords of the uppermost layer and the lowermost layer, that is, the pressure receiving faces are restrained by the above-mentioned flanges. As a result, the vertical rigidity is further increased and the upper and lower flanges are present, so that the top and bottom topping cords can be used as bolt heads and nuts without using other metal washers at the time of fastening. It will not be damaged by the contact, and the conventional metal washer becomes unnecessary and the fastening work will be easy.

The reinforcing cord is a steel cord or a filament made of nylon, polyester, polypropylene, rayon, aramid fiber, glass, carbon or the like or its twisted yarn, and has a thickness of 0.1 to 5 mm,
Especially, 0.2 to 1.5 mm is preferable. Steel cord
The fiber cords are used in parallel, and the fiber cord is used by weaving it into a blind fabric or a mesh fabric and then topping with rubber. The arrangement pitch of these chords is
It is preferably 1 to 5 times the cord diameter.

As the rubber, natural rubber and synthetic rubber such as ethylene propylene rubber, nitrile rubber, halogenated rubber, chloroprene rubber, ethylene propylene diene rubber, butadiene rubber and polyurethane can be used, and these rubbers are used as the above-mentioned blinds. A dopping cord is manufactured by topping a woven fabric or a mesh woven fabric, the topping cord is punched into a desired shape, and a required number of the laminated topping cords are laminated.

The upper flange laminated on the uppermost topping cord, the lower flange laminated on the lowermost topping cord, and the intermediate plate interposed between the intermediate topping cords are made by punching steel plates. However, it is preferable that the upper flange has a larger thickness than the intermediate plate and the lower flange. In this case, when the upper flange is used on the side in contact with the bolt head or the nut, the deformation is small, so that the topping cord The compression is even. The lower flange and the intermediate plate may be mild steel plates, but especially when the upper flange is made of hardened and tempered hard steel plate, the deformation when the upper flange is used on the side in contact with the bolt head or nut is smaller. Therefore, it becomes possible to reduce the thickness of the upper flange.

The upper flange and the lower flange are punched to form a flange by covering the end surface of the laminated body of topping cords. That is,
The outer diameters of the upper and lower flanges are larger than the outer diameter of the topping cord, and the inner diameter is preferably equal to or smaller than the inner diameter of the topping cord.
In addition, it is preferable that the inner plate has a larger inner diameter and a smaller outer diameter than the topping cord so that it is not exposed after lamination, but it is punched to a size equal to the topping cord, and after lamination, the inner surface and the outer surface are covered with rubber. Maybe,
In this case, the upper and lower flanges can also be punched to have the same inner diameter as the topping cord, and after laminating, the entire inner surface of the upper and lower flanges can be covered with rubber.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 A topping cord is made by topping rubber on a blind fabric made of polyester cord, and the obtained topping cord is punched into a circular ring shape to form a ring-shaped topping cord. On the other hand, a mild steel plate having a thickness of 0.5 to 3 mm is punched into the same size as the ring-shaped topping cord to form an intermediate plate. Further, a mild steel plate having a thickness of 0.5 to 5 mm is punched into a ring shape having a smaller inner diameter and a larger outer diameter than the ring-shaped topping cord to form a lower flange. Further, an unquenched hard steel plate having a thickness of 1 to 15 mm is punched into the same shape as the lower flange and quenched to form an upper flange.

2 to 50 of the ring-shaped topping cord
Stack the sheets one above the other, sandwich the intermediate plates one by one at positions that divide them into multiple groups, and wrap a weather resistant rubber sheet on the inner and outer surfaces of this laminate to provide the top surface of the top ring-shaped topping cord. The upper flange, and the lower flange on the lower surface of the lowermost ring-shaped topping cord. However, when stacking the above-mentioned ring-shaped topping cords, the cord direction of the ring-shaped topping cord that continues below the second layer, the third layer, etc. is clockwise by 45 degrees with respect to the cord direction of the uppermost ring-shaped topping cord. Make it slip. An adhesive is applied in advance to the surfaces of the intermediate plate, the upper flange, and the lower flange that are in contact with the ring-shaped topping cord.

The laminated body obtained by the above-mentioned lamination is vulcanized under pressure to bond the ring-shaped topping cord, the intermediate plate, the upper flange, the lower flange and the rubber sheet to each other and integrate them into a fastening elastic washer. FIG. 1 shows a vertical cross section of the obtained elastic washer 10 for fastening, 11 is a reinforcing rubber portion composed of a ring-shaped topping cord and a wound rubber sheet, 12 is an intermediate plate, 13 is an upper flange, 14 is a lower flange, Reference numeral 15 is a central hole for inserting a bolt.

FIG. 2 shows the use state of the above-mentioned elastic washer 10 for fastening, 21 and 22 are structures, and when these two structures 21 and 22 are fastened with the bolt 23 and the nut 24, Under the head 23a of the bolt 23, there is one elastic washer 10 for fastening, the upper flange 13 of which is the bolt head 2.
3a, the lower flange 14 is attached so as to contact one of the structures 21, and the second fastening elastic washer 10 is attached.
The upper flange 13 is in contact with the nut 24 and the lower flange 14 is in contact with the other structure 22, and the nut 24 is rotated.

Embodiment 2 A steel cord is used instead of the polyester cord of Embodiment 1, the inner diameters of the upper and lower flanges are made equal to those of the ring-shaped topping cord, and the entire inner surface of the laminate extending over the upper and lower flanges is covered with weather resistant rubber. Except for this, the fastening elastic washer is made in the same manner as in the first embodiment.

[0017]

EXAMPLE Polyester cords (1500 denier, 2 strands, thickness: 1.0 mm) are arranged at a density of 20 strands / inch, and EPDM is topped on a woven fabric.
The obtained topping cord with a thickness of 1.0 mm has an inner diameter of 35 m.
A ring-shaped topping cord was punched out in a ring shape having an m and an outer diameter of 59 mm. On the other hand, mild steel plate with a thickness of 0.5 mm (SS
Material) with an inner diameter of 35 mm and an outer diameter of 59 mm
And Also, a mild steel plate (SS material) with a thickness of 1 mm has an inner diameter of 35
mm, outer diameter 63 mm, punched into a ring shape and lower flange 1
And 4. Furthermore, a hard steel plate with a thickness of 6 mm before quenching (S4
5C material) was punched out into a ring shape having the same size as the lower flange, and then quenched to obtain the upper flange 13.

The ring-shaped topping cord, the intermediate plate 12, the upper flange 13 and the lower flange 14 are combined and laminated as shown in Table 1 below, and the ring-shaped topping cord and the intermediate plate 12 are laminated on the outer surface and the upper and lower portions. The inner surface of the entire laminate extending over the flanges 13 and 14 was covered with a rubber sheet made of CR and having a thickness of 1 mm, and integrated by vulcanization to fabricate the elastic washers of Comparative Example 1, Example 1 and Example 2 as a shaft, The spring constant and the stress relaxation rate in the direction were measured and are also shown in Table 1. However, when laminating the ring-shaped topping cords, the orientation of the polyester cords was shifted by 45 degrees. Further, the intermediate plate 12 is arranged in the middle of the topping cord layer in the first embodiment, and is arranged in a position where the topping cord layer is divided into three equal parts in the second embodiment. As for the stress relaxation rate, a regression equation was created by plotting the measured values for 100 hours on a graph, and the stress relaxation rate corresponding to 100 years was calculated.

Table 1 Comparative Example 1 Example 1 Example 2 Number of layers of topping cord 14 14 14 Number of intermediate plates 0 1 2 Height of elastic washer (mm) 20 20 20 Axial spring constant (ton / cm) 80 110 130 Stress relaxation rate (%) 30 27 25

[0020]

According to the invention described in claim 1, an upper flange and a lower flange made of steel sheets are respectively provided on the uppermost layer and the lowermost layer of a laminated body of a plurality of sheet-shaped topping cords, and an intermediate portion made of steel sheets is provided in the middle. Since the elastic washers for fastening are made by laminating and integrating plates, the rigidity in the axial direction is improved and the stress relaxation rate is reduced compared to the conventional washer made of a laminated body with only topping cords. Will be easier.

According to a second aspect of the present invention, in the elastic washer for fastening according to the first aspect, the upper flange is made of a hard steel plate having a larger thickness than the lower flange, and the lower flange and the intermediate plate are made of a mild steel plate. Therefore,
When the upper flange contacts the bolt head or nut for fastening and the lower flange contacts the structure,
The curvature and deformation of the upper flange are significantly reduced, and the rigidity in the axial direction is improved accordingly, and the thickness can be reduced by using a hard steel plate for the upper flange.

According to a third aspect of the present invention, in the elastic washer for fastening according to the first or second aspect, the outer surface of the laminated portion of the topping cord and the intermediate plate is covered with weather resistant rubber. In addition, it is possible to use a rubber having poor weather resistance such as natural rubber, and the material cost can be saved accordingly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a fastening elastic washer.

FIG. 2 is a sectional view showing a use state.

[Explanation of symbols]

10: elastic washer for fastening, 11: reinforced rubber portion, 12:
Intermediate plate, 13: upper flange, 14: lower flange, 1
5: center hole, 21, 22: structure, 23: fastening bolt, 23a: bolt head, 24: nut.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Norihiko Tatsumi 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. (72) Inventor Yoshikazu Kido 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo No. Kumagai Gumi Tokyo Head Office (72) Inventor Tatsuya Okamoto 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagai Gumi Tokyo Head Office

Claims (3)

[Claims] 1. A plurality of sheet-shaped topping cords obtained by topping a large number of reinforcing cords arranged in parallel with each other, the reinforcing cords having 90 ° intervals, 45 ° intervals, etc. when viewed from above. When stacking so as to be equally distributed in different directions, upper and lower flanges made of steel sheets are stacked on the uppermost layer and the lowermost layer, respectively, and an intermediate plate made of steel sheet is laminated in the middle, and these steel sheets are topped with a topping cord. An elastic washer for fastening, which is integrated by vulcanization and adhesion. 2. The elastic washer for fastening according to claim 1, wherein the upper flange is made of a hard steel plate having a thickness larger than that of the lower flange, and the lower flange and the intermediate plate are made of a mild steel plate. 3. The elastic washer for fastening according to claim 1 or 2, wherein the outer surface of the laminated portion of the topping cord and the intermediate plate is covered with weather resistant rubber.