JP2004169793A - Conical spring washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conical spring washer capable of obtaining sufficient locking effect with a small tightening force, and enhancing setting resistance. <P>SOLUTION: A conical spring washer 1 is compressed between two members, and comprises a plurality of first notched portions 4 formed with a circumferential interval so as to part a circumferential edge on a small diameter side and a plurality of second notched portions 5 formed with a circumferential interval so as to part a circumferential edge on a large diameter side. The first notched portions 4 and the second notched portions 5 are disposed along the circumferential direction in a zigzag manner. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disc spring washer compressed between two members.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of disc spring washer, there has been known an annular plate made of spring steel, which is formed into a truncated conical shape by performing press working (for example, see Non-Patent Document 1).
[0003]
[Non-patent document 1]
JIS Term Dictionary, published on November 20, 1995, page 668, right column.
[0004]
[Problems to be solved by the invention]
The disc spring washer has the advantage of being the simplest in shape and inexpensive, but on the other hand, the elastic deformation area due to tightening is narrow, so that when the tightening force is small, a sufficient locking effect cannot be obtained. If the tightening force is large, there is a problem that the disc spring washer is permanently deformed over time, causing sag.
[0005]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a disc spring washer capable of obtaining a sufficient locking effect with a small tightening force and having improved sag resistance.
[0006]
According to the present invention, there is provided a disc spring washer compressed between two members, wherein a plurality of first washers are formed at circumferential intervals so as to divide a small diameter side peripheral edge. A notch portion, and a plurality of second notch portions formed at circumferential intervals so as to divide the periphery on the large-diameter side, wherein the first notch portion and the second notch portion are provided. Are provided in a zigzag pattern along the circumferential direction.
[0007]
With this configuration, the elastic deformation area of the disc spring washer can be expanded as compared with the conventional example, and the lever ratio can be increased, so that a sufficient locking effect can be obtained with a relatively small tightening force. Further, since the surface pressure on the large diameter side becomes larger than that of the conventional example due to the presence of the plurality of second notches, the sag resistance is reduced by the stepping force on the large diameter side and the action of expanding the elastic deformation region. Can be improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2, a disc spring washer 1 is compressed between two members 2 and 3 and is formed into a truncated conical shape by pressing an annular plate made of spring steel. A plurality of first notches 4 formed at equal intervals on the circumference so as to divide the periphery of the plurality of notches, and a plurality of first notches 4 formed at equal intervals on the circumference so as to divide the periphery on the large diameter side. That is, the first notch 4 and the same number of second notches 5 are provided, and the first notch 4 and the second notches 5 are arranged in a zigzag shape along the circumferential direction. ing.
[0009]
As described above, when the plurality of first and second notches 4 and 5 are formed on the small and large diameter sides, respectively, the elastic deformation region of the disc spring washer 1 can be expanded.
[0010]
Further, when the disc spring washer 1 is sandwiched between the two members 2 and 3 and a tightening force is applied to the disc spring washer 1 via one member 2 from the small diameter side thereof, in FIG. When the action point a is taken at the bisected position of each ridge 6 which is located between the first notches 4 and contacts one of the members 2, the first and second notches 4, 5 are arranged in a zigzag shape. Therefore, the fulcrum s is located between the two adjacent second notches 5 and is a bisecting position of each ridge 7 in contact with the other member 3. That is, the fulcrum s is located at a position circumferentially deviated from the intersection of the circumference c passing through each ridge 7 and the extension line L connecting the action point a and the center o of the large and small diameters. the distance between the point a and the fulcrum s becomes D _1.
[0011]
In the case of the conventional example, since the first and second notches 4 and 5 are not provided as described above, the elastic deformation region is narrow, and the action point a in FIG. and take the same position, the fulcrum s ₁ is at the intersection of the circumference c and extension L, the distance between the point a and the fulcrum s ₁ becomes D _2. Therefore, the distance _{D 1} of the inter-working point a and the fulcrum s examples, than the distance _{D 2} of the prior art large, that is, _D 1> _{D 2.}
[0012]
As described above, in the embodiment, since the elastic deformation region can be expanded and the lever ratio can be increased as compared with the conventional example, a sufficient locking effect can be obtained with a relatively small tightening force. In addition, since the surface pressure on the large diameter side becomes larger than that of the conventional example due to the presence of the plurality of second notches 5, the sag resistance is increased by the stepping force on the large diameter side and the action of expanding the elastic deformation region. Can be improved.
[0013]
When the disc spring washer 1 is used as a conductor for electrically connecting the two members 2 and 3, each of the ridges between the adjacent first notches 4 and contacting one of the members 2 is provided. the circumferential length L ₁ of 6, phase Tonariru there between both second notch 5 and the circumferential length L ₂ of each ridge 7 which contacts the other member 3 L _{1 =} L ₂ (Including L ₁ ≒ L ₂ ). With this configuration, the contact resistance between the disc spring washer 1 and the two members 2 and 3 can be reduced as much as possible.
[0014]
Also, as shown in FIGS. 3 and 4, in the disc spring washer 1 obtained by performing a cutting process on each of the ridges 6 and 7, one of the members 2 is located between the adjacent first cutouts 4. in the area a ₁ of the contact surface 8 in contact, phase Tonariru there between both second notch 5, the area a ₂ of the contact surface 9 in contact with the other member 3 a _{1 =} a ₂ (including A ₁ ≒ A ₂ ), the contact resistance between the disc spring washer 1 and both members 2 and 3 can be reduced as much as possible, and a large current can be passed between the two members. Becomes possible.
[0015]
4, the height of the conical spring washer 1 is h, whereas, when the outer diameter of the large diameter side and the d _1, the ratio h / d ₁ is preferably set to h / d ₁ ≦ 0.5 . For example, in a disc spring washer 1 having an outer diameter d ₁ = 19.6 mm on the large diameter side, an inner diameter d ₂ = 11 mm on the small diameter side, a height h ≒ 1.8 mm, and a thickness t = 0.6 mm, the ratio h / d ₁ is h / d ₁ ≒ 0.09. This is the same for the examples of FIGS.
[0016]
FIG. 5 shows an example in which the disc spring washer 1 is applied to the electric double layer capacitor 10 as a conductor. The bottomed cylindrical body 11 of the capacitor 10 is made of an Al alloy, and contains a positive electrode and a negative electrode wound in a cylindrical shape in an insulated state. A part of the Al alloy cylinder 12 is fitted and welded to the opening of the container 11. The body 11 and the cylinder 12 function as a negative electrode terminal.
[0017]
An annular insulator 13 made of synthetic resin is integrally provided on the inner peripheral surface of the cylindrical body 12 on the side of the body 11, and a positive electrode terminal 14 is provided on the inner peripheral surface of the annular insulator 13 and an annular end surface facing the interior of the cylindrical body 12. Is held. The disc spring washer 1 shown in FIGS. 3 and 4 is mounted on the circular end surface of the positive electrode terminal 14, and a positive bus bar connecting member 15 made of an Al alloy is mounted thereon. The connecting member 15 has a cylindrical portion 17 having a female screw hole 16 and a flange portion 18 at one end thereof for covering the disc spring washer 1. The connecting member 15 is covered with a synthetic resin cylindrical insulator 19. The cylindrical insulator 19 is fitted on the outer peripheral surface of the flange portion 18 and extends to the vicinity of the annular insulator 13. It has a small diameter portion 21 fitted to the cylindrical portion 17 and an annular portion 22 connecting the large and small diameter portions 20, 21.
[0018]
The annular portion 24 of the negative electrode bus bar 23 is placed on the annular end surface of the cylindrical body 12, and the annular portion 18 is closely attached to the cylindrical body 12 by the negative bus bar connecting member 25 and is electrically connected. The connecting member 25 has a threaded cylindrical portion 26 having an external thread that meshes with an internal thread on the inner peripheral surface of the cylindrical body 12, and a flange portion provided at one end thereof for pressing the annular portion 24 of the negative electrode bus bar 23 against the annular end surface of the cylindrical body 12. 27, and an annular projecting portion 28 which is located on the inner peripheral surface of the screw tube portion 26 and presses the positive bus bar connecting member 15 against the disc spring washer 1 via the cylindrical insulator 19.
[0019]
An annular plate-shaped insulator 29 made of synthetic resin is placed on the flange portion 27 of the connection member 25, and the hole 30 is fitted in the cylindrical portion 17. The positive bus bar 31 is placed on the annular plate-shaped insulator 29, the mounting bolt 34 is screwed into the female screw hole 16 of the cylindrical portion 17 through the bolt hole 33 existing in the connection portion 32 of the positive bus bar 31, and the flange portion is formed. The connecting portion 32 of the positive electrode bus bar 31 is sandwiched between 35 and the annular end surface of the cylindrical portion 17.
[0020]
In the above configuration, the electrical connection between the positive electrode terminal 14 and the connection member 15 is maintained for a long period of time by the loosening effect of the disc spring washer 1 and good set resistance.
[0021]
【The invention's effect】
According to the first aspect of the present invention, by providing the above-described structure, it is possible to provide a disc spring washer having a sufficient locking effect with a small tightening force and having improved set resistance. Can be.
[0022]
According to the second aspect of the present invention, in addition to the above-described effects, it is possible to provide a disc spring washer capable of minimizing the contact resistance between the two members when electrically connecting the two members. it can.
[0023]
According to the third aspect of the present invention, in addition to the above-described effects, a disc spring washer capable of flowing a large current between two members can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view of an example of a disc spring washer.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a plan view of another example of a disc spring washer.
FIG. 4 is a sectional view taken along line 4-4 of FIG. 3;
FIG. 5 is a sectional view of a main part of the electric double layer capacitor.
[Explanation of symbols]
1... Disc spring washer 2... Member 3... Member 4... First notch 5... Second notch 6... Ridge 7. Surface 9 Contact surface

Claims (3)

A plurality of first notches (1), which are disc spring washers (1) compressed between two members (2, 3), and are formed at circumferential intervals so as to divide the small diameter side periphery. 4), and a plurality of second notches (5) formed at circumferential intervals so as to divide the periphery on the large diameter side, and the first notch (4) and the second notch (5) are provided. The disc spring washer, wherein the second notch (5) and the second notch (5) are arranged in a zigzag shape along the circumferential direction. In the interphase Tonariru both first notch (4),-out circumferential length L _1, phase Tonariru both second cut of each edge (6) in contact with one of said members (2) _2. The dish according to claim 1, wherein a circumferential length L ₂ of each ridge (7) between the portions (5) and in contact with the other member (3) has a relationship of L ₁ = L _2. Spring washer. In the interphase Tonariru both first notch (4), one of the respective contact surfaces in contact with the member (2) and the area A ₁ (8), the phase Tonariru both second notch ( 5. The disc spring washer according to claim 1, wherein an area A _{2 of} each contact surface (9) between the contact surfaces (9) that contacts the other member (3) has a relationship of A ₁ = A ₂ .

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