Seal washer and attachment method thereof

Abstract

To provide a seal washer which can smoothly perform a fastening operation of a fixture, and is high in seal performance, and an attachment structure thereof.SOLUTION: A seal washer 10 comprises: an annular core material 11; an outside seal part 13 formed of an elastic material which firmly adheres to an end part of the core material 11 at an external peripheral side; and an inside seal part 14 formed of an elastic material which firmly adheres to an end part of the core material 11 at an internal peripheral side. The core material 11 comprises: a core material main body 11a; and a seal base part 11b extending from the core material main body 11a to the external peripheral side, the outside seal part 13 is arranged so as to protrude to a face oriented to a mating member side out of two faces of the seal base part 11b in a thickness direction rather than a surface of the core material main body 11, and the inside seal part 14 is arranged so as to protrude to an end face 14d of the core material main body 11a at an internal peripheral side toward further inside, and to protrude toward a fastening part side rather than the surface of the core material main body 11a. An inside diameter of the outside seal part 13 is set larger than a diameter of an insertion hole, the diameter of the insertion hole is set larger than an inside diameter of the core material 11, and an outside diameter of the fastening part is set larger than the inside diameter of the core material 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seal washer and an attachment structure thereof. [Background technology]

[0002] Some conventional sealing washers include an annular core material, an outer sealing portion made of an elastic material and fixed to the outer end of the core material, and an inner sealing portion made of an elastic material and fixed to the inner end of the core material (see, for example, Patent Document 1).

[0003] This type of seal washer is configured such that the outer seal portion seals between the seal washer and the mating member by elastically contacting the mating member, while the inner seal portion seals between the seal washer and the fastening portion of the fixing device by elastically contacting the fastening portion (a ring washer in Patent Document 1), thereby preventing moisture from entering the insertion hole of the mating member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2014 / 080511 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the technology described in the above document, when the target component is fixed with the fixing device, as the rotation operation progresses and the elastic contact of the outer seal portion with the mating component and the elastic contact of the inner seal portion with the fastening portion progresses, the seal washer comes into a state in which a pressing force due to the elastic contact acts on both the mating component and the fixing device, making it difficult to rotate the fixing device thereafter.

[0006] The present invention has been proposed to solve such problems, and its object is to provide a seal washer with high sealing properties that allows smooth fastening operations of a fastener, and an attachment structure thereof. [Means for solving the problem]

[0007] In order to achieve the above object, the seal washer of the present invention is a seal washer arranged between a fastening portion of a fixture having a fastening portion and a shaft portion, and a mating member having an insertion hole through which the shaft portion passes, the seal washer comprising an annular core material, an outer seal portion made of an elastic material fixed to an end portion on an outer circumferential side of the core material, and an inner seal portion made of an elastic material fixed to an end portion on an inner circumferential side of the core material, the core material comprising a core material main body and a seal base portion extending outward from the core material main body, the outer seal portion being formed on the seal base the inner seal portion is arranged on the surface of the core material body facing the opposing member, of the two surfaces in the thickness direction of the portion, so as to protrude further inward, and is arranged on the inner end face of the core material body so as to protrude further inward and further than the surface of the core material body toward the fastening portion, the inner diameter of the outer seal portion is larger than the diameter of the insertion hole, the diameter of the insertion hole is larger than the inner diameter of the core material, and the outer diameter of the fastening portion is larger than the inner diameter of the core material.

[0008] Furthermore, the mounting structure of the seal washer of the present invention is characterized in that the seal washer mounting structure is arranged between a fastening portion of a fixture having a fastening portion and a shaft portion, and a mating member having an insertion hole through which the shaft portion is inserted, and the seal washer of the present invention is used.

[0009] The seal washer and the mounting structure for the seal washer according to the present invention may further include two or more configurations selected from the following configurations (1) to (3) in a combinable manner. Configuration (1): The inner seal portion further includes an engaging piece protruding inward from the inner peripheral end face thereof, the engaging piece being a plate-like piece thinner than the inner seal portion, and the tip of the engaging piece engaging with the peripheral surface of the shaft portion at least when the inner seal portion is not elastically deformed. Configuration (2): The engagement pieces are formed discontinuously along the circumferential direction. Configuration (3): A screw groove is formed in the shaft portion, and the tip of the engagement piece can engage with the screw groove. Effect of the Invention

[0010] Since the seal washer and its mounting structure of the present invention are configured as described above, when a mating member is mounted using a fastener, the sealing performance can be improved and the fastener can be smoothly tightened. [Brief description of the drawings]

[0011] [Figure 1] 1A is a plan view of the seal washer according to an embodiment of the present invention, FIG. 1B is a vertical cross-sectional view taken along line AA of the seal washer, and FIG. 1C is a vertical cross-sectional view taken along line A'-A' of the seal washer. [Diagram 2] 1A is a cut-away end view and a partially enlarged view showing a usage pattern (chronological order, 1 / 2) of the seal washer. FIG. [Diagram 3] 1A is a cut-away end view and a partially enlarged view showing a usage pattern (chronological order, 2 / 2) of the seal washer. FIG. [Figure 4] 13(a) and (b) are cross-sectional end views showing a usage pattern of a seal washer according to another embodiment. [Diagram 5] 13(a) to 13(e) are cross-sectional end views of a seal washer according to still another embodiment. [Figure 6] 5A and 5B are explanatory views of a seal washer according to still another embodiment, in which (a) is a plan view of the seal washer, and (b) is a vertical cross-sectional view taken along line BB of the seal washer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. First, a common basic configuration of the seal washers 10, 10A to 10G according to the multiple embodiments illustrated in Figs.

[0013] The seal washers 10, 10A to 10G are disposed between a fastening portion 31 of a fixture 30 having a fastening portion 31 and a shaft portion 32, and a mating member 1 having an insertion hole 2 through which the shaft portion 32 is inserted.

[0014] Each of the seal washers 10, 10A to 10G comprises an annular core material 11, an outer seal portion 13 made of an elastic material affixed to an outer peripheral end of the core material 11, and an inner seal portion 14 made of an elastic material affixed to an inner peripheral end of the core material 11. The core material 11 comprises a core material main body 11a and a seal base portion 11b extending outward from the core material main body 11a.

[0015] The outer seal portion 13 is disposed on one of the two thickness-wise surfaces of the seal base 11b facing the mating member 1 so as to protrude beyond the surface (mating surface) 11ab of the core body 11a, and the inner seal portion 14 is disposed on an end face 14d on the inner periphery side of the core body 11a so as to protrude further inward and beyond the surface (fixed surface) 11aa of the core body 11a toward the fastening portion 31. The inner diameter r1 of the outer seal portion 13 is larger than the diameter r3 of the insertion hole 2, the diameter r3 of the insertion hole 2 is larger than the inner diameter r4 of the core material 11, and the outer diameter r2 of the fastening portion 31 is larger than the inner diameter r4 of the core material 11.

[0016] Next, the seal washer 10 and its mounting structure according to the embodiment shown in Fig. 1 will be described with reference to Figs. 1 to 3. Fig. 1(a) is a plan view of the seal washer 10, Fig. 1(b) is a vertical cross-sectional view taken along line AA, and Fig. 1(c) is a vertical cross-sectional view taken along line A'-A'. Figs. 2 and 3 are views showing the mounting structure of the seal washer 10, Fig. 2 is a cut-away end view and a partially enlarged view showing a usage pattern of the seal washer 10 (chronological order, 1 / 2), and Fig. 3 is a cut-away end view and a partially enlarged view showing a usage pattern of the seal washer 10 (chronological order, 2 / 2).

[0017] In the following description of the seal washer 10, the side of the fastening portion 31 of the fixing device 30 of the seal washer 10 will be referred to as the "fixed side," and the side of the mating member 1 of the seal washer 10 will be referred to as the "mating side." The same applies to seal washers 10A to 10G shown in Figs. 4 to 6, which are explanatory diagrams of other embodiments.

[0018] The seal washer 10 in Fig. 1 is an annular body as shown in Fig. 1(a), and is integrally composed of an annular core material 11 made of metal, an elastic seal portion 12 made of an elastic material, and an engagement piece 15 made of an elastic material. Materials for the core material 11 include metal materials such as iron, copper, and aluminum, as well as hard synthetic resin materials. Examples of elastic materials include rubber and soft synthetic resins having elasticity.

[0019] The core material 11 comprises a core material body 11a and a seal base 11b provided on the outer periphery of the core material body 11a. The core material body 11a has a substantially uniform thickness and is generally rectangular in cross section. The seal base 11b is an annular plate piece having a thickness of about 1 / 3 of the core material body 11a, and is formed so as to extend generally parallel to the core material body 11a outward from the approximate center in the thickness direction of the outer periphery of the core material body 11a.

[0020] The elastic seal portion 12 comprises an outer seal portion 13 disposed on the outer periphery of the seal washer 10, and an inner seal portion 14 disposed on the inner periphery of the seal washer 10. An engagement piece 15 consisting of an annular plate-like piece that protrudes inwardly from approximately the center in the thickness direction of the end face 14d and generally parallel to the core body 11a is provided on an end face 14d on the inner periphery side. In this illustrated example, the engagement piece 15 is made by integral molding from the same elastic material as the elastic seal portion 12.

[0021] The engagement piece 15 may be any piece that engages with the shaft portion 32 of the fastener (bolt) 30, which is disposed so as to penetrate the space (circular opening 18) inside the engagement piece 15 when the seal washer 10 is used. That is, the engagement piece 15 may lightly press the shaft portion 32 from the periphery, or the tip 15a of the engagement piece 15 may enter the thread groove 33a of the male screw portion 33, or the tip 15a of the engagement piece 15 may be caught in the thread 33b of the male screw portion 33, so that the engagement piece 15 embraces the shaft portion 32 and the seal washer 10 and the bolt 30 are provisionally fixed to each other. The engagement piece 15 in the example of FIG. 1 is formed in a substantially semicircular shape so that the tip 15a can easily enter the thread groove 33a.

[0022] Therefore, the diameter of the opening 18 surrounded by the engagement piece 15 is approximately the same as or slightly smaller than the diameter of the shaft portion 32 of the bolt 30 to which the seal washer 10 is attached. Note that engagement by the engagement piece 15 may be with the neck portion 34 (non-threaded portion) of the shaft portion 32.

[0023] It is sufficient that the tip 15a of this engaging piece 15 engages with the circumferential surface of the shank 32 of the bolt 30 at least before elastic deformation of the inner seal portion 14 occurs during the fixing operation of the counterpart member 1. Note that the engagement between (the engaging piece 15 of) the seal washer 10 and (the shank 32 of) the bolt 30 may be such that the engagement is released as the fixing of the counterpart member 1 to the mounting member 20 by the bolt 30 progresses, as will be described later.

[0024] In other words, the engaging piece 15 only needs to be capable of temporarily integrating the bolt 30 and the seal washer 10 at least in the stage prior to the fixing operation of the mating member 1 to the mounting member 20. In other words, this temporary integration allows the set of members consisting of the bolt 30 and the seal washer 10 to be handled as one unit in a temporarily integrated state, and as a result, it is possible to prevent the two members from being separated and one of the members from being lost during storage or transportation of the set of members prior to the operation.

[0025] In addition, the core material 11, outer seal portion 13, inner seal portion 14 and engaging piece 15 of the seal washer 10 in this illustrated example are symmetrical on the front and back, and the seal washer 10 as a whole is also symmetrical on the front and back.

[0026] The outer seal portion 13 is fixed in a separated state to both thickness-wise surfaces (the fixed side surface and the mating side surface) of the seal base 11b, and as shown in Figures 1(b) and (c), the outer seal (fixed side) 13a protrudes beyond the fixed side surface 11aa of the core material body 11a, and the outer seal (mating side) 13b protrudes beyond the mating side surface 11ab of the core material body 11a.

[0027] In addition, the inner seal portion 14 has an inner seal body 14a, and on the fixed side of the inner seal body 14a, it has a fixed side convex portion 14b that protrudes beyond the fixed side surface 11aa of the core body 11a, and on the mating side of the inner seal body 14a, it has a mating side convex portion 14c that protrudes beyond the mating side surface 11ab of the core body 11a.

[0028] In addition, regarding the degree of protrusion in the thickness direction of the outer seal portion 13 and the inner seal portion 14, in the example shown in the figure, the degree of protrusion of the inner seal portion 14 is slightly greater than the degree of protrusion of the outer seal portion 13, but is not limited to this.

[0029] The seal washer 10 may be manufactured by integrally forming the core material 11, the elastic seal portion 12, and the engagement piece 15 by two-color molding using an injection molding die, but it may also be manufactured by attaching the elastic seal portion 12 and the engagement piece 15, which are separately molded, to the core material 11 later. Note that, since the seal washer in this figure is manufactured by two-color molding, the inner seal portion 14 and the outer seal portion 13 are connected by a connecting portion 12a that appears on the front and back surfaces (see FIGS. 1(a) and (c)).

[0030] As shown in Figure 2, the bolt 30 and the seal washer 10 are used to fix a plate-shaped mating member 1 having an insertion hole 2 through which the shaft portion 32 of the bolt 30 is inserted, to an attachment member 20 having a female threaded portion (embedded nut portion) 21.

[0031] That is, the male threaded portion 33 (see the enlarged view in FIG. 1) of the shaft portion 32 of the bolt 30 is in a screw-fit relationship with the female threaded portion 21 of the mounting member 20, and the mating member 1 is fixed so as to be sandwiched between the fastening portion (bolt head) 31 of the bolt 30 and the mounting member 20. The seal washer 10 is used by being disposed between the back surface of the bolt head 31 and the surface of the mating member 1.

[0032] Fig. 2 is a diagram showing a state in the middle of a fastening operation, in which the male threaded portion 33 of the bolt 30 and the female threaded portion 21 of the mounting member 20 are in a screwed state, and the seal washer 10 is sandwiched between the bolt head 31 and the mating member 1. Fig. 3 is a diagram showing a state in which the bolt 30 has been screwed forward from the state shown in Fig. 2, and the mating member 1 has been fixed to the mounting member 20.

[0033] In this mounting structure for the seal washer 10, the dimensional relationship between the seal washer 10, the mating member 1, and the bolt 30 is expressed by the following relational expressions. Note that the diameter, inner diameter, and outer diameter in each relational expression are radii, that is, dimensions from the central axis L (see FIG. 2(a)).

[0034] Inner diameter r1 of outer seal portion 13 > outer diameter r2 of bolt head 31 Inner diameter r1 of the outer seal portion 13 > diameter r3 of the insertion hole 2 of the mating member 1 Diameter r3 of insertion hole 2 of counterpart member 1 > inner diameter r4 of core material 11 (outer diameter of inner seal portion 14) Outer diameter r2 of bolt head 31 > inner diameter r4 of core material 11 Although the relationship between the outer diameter r2 of the bolt head 31 and the diameter r3 of the insertion hole 2 is not defined, in this illustrated example, r2>r3.

[0035] The above relational equation expresses that the outer seal portion 13 does not face the bolt head 31 on the front surface side (i.e., the front surface side of the outer seal portion 13 is space), the outer seal portion 13 faces the surface of the mating member 1 on the back surface side, the inner seal portion 14 faces the back surface of the bolt head 31 on the front surface side, and the inner seal portion 14 faces the space created by the insertion hole 2 on the back surface side.

[0036] 2, the outer seal (mating side) 13b of the outer seal portion 13 is in contact with the surface 1a of the mating member 1, while the fixed side convex portion 14b of the inner seal portion 14 is in contact with the back surface of the bolt head 31. Then, by further advancing the screwing, it becomes impossible to screw in any further, and the state of FIG. 3 is reached in which all the members are fixed to each other.

[0037] 3, the outer seal (mating side) 13b of the outer seal portion 13 is in elastic contact with and compressed by the surface 1a of the mating member 1. At this time, the shape of the outer seal (fixed side) 13a does not change compared to the state in FIG.

[0038] In this elastic contact state, the outer seal (mating side) 13b of the outer seal portion 13 is backed up from the fixed side by the seal base 11b in the thickness direction of the seal washer 10, so the reaction force (elastic contact force, elastic return force) becomes large, and as a result, the outer seal portion 13 of the seal washer 10 is firmly in contact with the surface of the mating member 1.

[0039] In this way, the seal washer 10 prevents moisture from entering the insertion hole 2 over the entire circumference of the annular portion surrounding the insertion hole 2, thereby fulfilling a sealing role.

[0040] Meanwhile, the fixed side convex portion 14b of the inner seal portion 14 elastically contacts the back surface of the bolt head 31, and at the same time, the entire inner seal portion 14 is pressed by the bolt 30 toward the space side of the insertion hole 2, elastically deforming, and part of it enters the insertion hole 2.

[0041] In other words, since the inner seal portion 14 is not structured to be backed up by a core (seal base 11b) like the outer seal (mating side) 13b of the outer seal portion 13, only a small elastic restoring force is generated by pressing, and therefore the reaction force is small, so that it deforms more than the outer seal (mating side) 13b of the outer seal portion 13, and collapses into the space of the insertion hole 2. In this way, the insertion hole 2 is positioned as an escape space for the inner seal portion 14.

[0042] As the inner seal portion 14 falls into the insertion hole 2, the fixed side convex portion 14b of the inner seal portion 14 elastically deforms due to pressure from the back surface of the bolt head 31, and its surface becomes approximately flush with the fixed side surface 11aa of the core body 11a, so that the bolt head 31 comes into approximately uniform contact with the core material 11 (see Figure 3).

[0043] In this way, the gap S (see FIG. 2) that was formed between the bolt head 31 and the seal washer 10 in the state shown in FIG. 2 is almost completely eliminated. Since the gap S is almost completely eliminated in this way, water intrusion from the surface side of the seal washer 10 can also be suppressed.

[0044] Furthermore, since the outer seal portion 13 is positioned outside the bolt head 31 and does not come into direct contact with the bolt 30 and does not form an elastic relationship, the outer seal portion 13 does not prevent water from entering from the surface side of the seal washer 10. However, instead, the inner seal portion 14 acts as described above and can prevent water from entering from the surface side.

[0045] Furthermore, as in the state shown in Figure 2, even if the seal washer 10 is sandwiched in contact between the mating member 1 (mounting member 20) and the bolt head 31 and a large reaction force is continuously generated by the outer seal portion 13, the inner seal portion 14 falls into the insertion hole 2, which is the escape space, and the screwing of the bolt 30 proceeds smoothly.

[0046] In short, by arranging the inner seal portion 14 radially inward of the insertion hole 2 of the mating member 1, no large force is required at the final stage of tightening the bolt 30, making the operation easier, and as a result, the tightening of the bolt 30 can be completed smoothly.

[0047] In this embodiment, in order to allow the inner seal portion 14 to fall smoothly into the insertion hole 2, the outer seal portion 13 is arranged outboard of the bolt head 31 as described above, and is configured so as not to interfere with the operation of the inner seal portion 14 in its relationship with the bolt head 31, but is not limited to this relationship (inner diameter r1 of the outer seal portion 13 > outer diameter r2 of the bolt head 31).

[0048] In order to achieve smooth collapse of the inner seal portion 14 into the insertion hole 2, it is sufficient that there is a mutual relationship such that at least the outer seal portion 13 is not in elastic contact with the bolt head 31. This relationship will be described later with reference to Figures 5(b) and (c).

[0049] Furthermore, by the inner seal portion 14 falling toward the insertion hole 2, the engagement of the engagement piece 15 with the shaft portion 32 is released, as shown in the enlarged views of Figures 2 and 3. As a result, the reaction force caused by the engagement between the engagement piece 15 and the shaft portion 32 disappears, which also makes it easier to screw in the bolt 30 and also prevents the seal washer from rotating with the rotation of the bolt 30.

[0050] Furthermore, in order to allow the engaging piece 15 to perform its original function (temporary integration of the bolt 30 and the seal washer 10), the reaction force due to the engagement between the engaging piece 15 and the shaft portion 32 may be sufficiently smaller than the reaction force of the outer seal portion 13, and if the engagement force is such a weak one, there is no problem even if the engagement is not released even when the bolt 30 is screwed in.

[0051] 1 is symmetrical in the thickness direction, meaning that there is almost no distinction between the fixed side and the mating side. Therefore, the seal washer 10 can be used without worrying about the front and back.

[0052] As described above, in order to maintain high sealing performance and smoothly fix the mating member 1 by screwing the bolt 30, it is sufficient that the dimensional relationship between the seal washer 10, the mating member 1, and the bolt 30 is established, as described above.

[0053] That is, Inner diameter r1 of outer seal portion 13 > outer diameter r2 of bolt head 31 Inner diameter r1 of the outer seal portion 13 > diameter r3 of the insertion hole 2 of the mating member 1 Diameter r3 of insertion hole 2 of counterpart member 1 > inner diameter r4 of core material 11 (outer diameter of inner seal portion 14) Outer diameter r2 of bolt head 31 > inner diameter r4 of core material 11 That's fine.

[0054] The mounting structure of the seal washer 10A shown in Fig. 4 also satisfies the above relational expression. In this example, the diameter r3 of the insertion hole 2 of the mating member 1 is larger than that in Fig. 1, but since the above relational expression is satisfied, the same effect as that in Fig. 1 can be achieved.

[0055] As shown in this example, the outer diameter r2 of the bolt head 31 and the diameter r3 of the insertion hole 2 may have a relationship of r2≦r3. In other words, even when a mating member 1 having a diameter r3 of the insertion hole 2 larger than the outer diameter r3 of the bolt head 31 is attached and fixed, the same effect as that of Figure 1 can be achieved as long as the above relationship is satisfied.

[0056] In addition, the seal washer 10A shown in FIG. 4 differs from that shown in FIG. 1 in that the outer seal portion 13 is made up of only the outer seal (mating side) 13b (there is no outer seal (fixed side) 13a), and the inner seal portion 14 does not have a mating side convex portion 14c.

[0057] Even with such a seal washer 10A, there are no particular problems with the elastic contact of the outer seal portion 13 with the mating member 1, the falling of the inner seal portion 14 into the insertion hole 2, and the flushing of the fixed side convex portion 14b with the core body 11a, and the same effect as that of the seal washer 10 in Figure 1 is achieved.

[0058] The shape of the seal washers 10, 10A is not limited to that shown in Figs. 1 and 4, but may be seal washers 10B to 10F shown in Figs. 5(a) to (e) according to other embodiments.

[0059] 5(a), the outer seal part 13 includes an outer seal (fixed side) 13a and an outer seal (mating side) 13b, and further includes a connecting part 13c that connects the outer seal (fixed side) 13a and the outer seal (mating side) 13b. This connecting part 13c is disposed so as to cover the end face on the outer circumferential side of the seal base part 11b.

[0060] The outer seal (mating side) 13b protrudes from the mating surface 11ab of the core body 11a, and the outer seal (fixed side) 13a protrudes from the fixed side surface 11aa of the core body 11a. The inner seal portion 14 is the same as that shown in FIG. 1(a).

[0061] Since the outer seal portion 13 is provided with the connecting portion 13c and is integral with the front and back, it is easy to attach the outer seal portion 13, which is molded separately from the core material 11, to the core material 11 afterwards. For example, this is convenient when the outer seal portion 13 is made of an elastic material different from that of the inner seal portion 14, or when a plurality of outer seal portions 13 are prepared so as to be replaceable with different degrees of protrusion of the outer seal portion 13 toward the mating member 1 in accordance with the type of mating member 1, etc.

[0062] 5(b), the outer seal part 13 includes an outer seal (fixed side) 13a and an outer seal (mating side) 13b, and the surface of the outer seal (fixed side) 13a is substantially flush with the fixed side surface 11aa of the core body 11a. The outer seal (mating side) 13b protrudes from the mating surface 11ab of the core body 11a.

[0063] Since the outer seal portion 13 has such a shape, it is possible to reduce the amount of elastic material used. Also, since the surface outside the inner seal portion 14 is approximately flush, even if a bolt 30 is used in which the bolt head 31 covers the outer seal portion 13 from above, there is almost no risk that the outer seal (fixed side) 13a will elastically contact the bolt head 31 during the work of fixing the mating member 1, and the inner seal portion 14 can be smoothly collapsed into the insertion hole 2. The inner seal portion 14 is the same as that shown in Fig. 1(a).

[0064] 5(c), the outer seal part 13 of the seal washer 10D does not include the outer seal (fixed side) 13a, but only includes the outer seal (mating side) 13b protruding from the mating surface 11ab of the core body 11a. The fixed side surface of the seal base 11b is formed substantially flush with the fixed side surface 11aa of the core body 11a.

[0065] Since the outer seal portion 13 is thus composed only of the outer seal (mating side) 13b, the amount of elastic material can be reduced. Also, since there is no outer seal (fixed side) 13a and the surface outside the inner seal portion 14 is substantially flush, even if a bolt 30 is used in which the bolt head 31 covers the outer seal portion 13 from above, there is almost no risk of the outer seal portion 13 elastically contacting the bolt head 31 during the fixing operation of the mating member 1, and the inner seal portion 14 can be smoothly collapsed into the insertion hole 2. The inner seal portion 14 is the same as that shown in Fig. 1(a).

[0066] In this way, in the case of seal washers 10C and 10D shown in Figures 5(b) and (c), the relationship between the seal washer 10 and the bolt 30 does not necessarily require the dimensional relationship of inner diameter r1 of the outer seal portion 13 > outer diameter r2 of the bolt head 31 as shown in Figure 2, etc.

[0067] In other words, even when these seal washers 10C, 10D are used with a bolt 30 in which the bolt head 31 covers the outer seal portion 13 from above, the inner seal portion 14 can be smoothly folded down into the insertion hole 2.

[0068] A seal washer 10E in FIG. 5(d) has an outer seal portion 13 similar to that in FIG. 1, and includes an outer seal (fixed side) 13a and an outer seal (mating side) 13b.

[0069] The core body 11a of the core 11 has a clamped portion 11ac for connecting the inner seal portion 14 to the inner peripheral end. The clamped portion 11ac is an annular plate piece similar to the seal base 11b, and has a thickness of about 1 / 3 of the core body 11a, and is provided so as to extend inward from approximately the center in the thickness direction of the inner peripheral end of the core body 11a. The inner seal body 14a, the fixed side protrusion 14b, and the mating side protrusion 14c are provided on the inner peripheral side of the clamped portion 11ac.

[0070] The inner seal portion 14 has an inner seal main body 14a, a fixed side convex portion 14b, and a mating side convex portion 14c, as well as a fixed side clamping piece 14e and a mating side clamping piece 14f, and is fixed to the core body 11a so that the fixed side clamping piece 14e and the mating side clamping piece 14f clamp the clamped portion 11ac of the core body 11a.

[0071] Since the inner seal portion 14 has a pair of clamping pieces on the front and back sides, when the inner seal portion 14 is molded separately, it can be easily attached to the core material 11 later. For example, this is easy to use when the inner seal portion 14 is made of an elastic material different from that of the outer seal portion 13, or when the degree to which the inner seal portion 14 protrudes toward the fastener 30 is varied in accordance with the type of fastener 30.

[0072] The clamped portion 11ac of the core body 11a has a different function from the seal base 11b, and does not back up the elastic contact behind the elastic material like the seal base 11b. However, it is possible to vary the degree of collapse of the inner seal portion 14 (inner seal body 14a, fixed side convex portion 14b, and mating side convex portion 14c) by varying the clamping mode by adjusting the thickness of the clamping pieces.

[0073] The seal washer 10F in Figure 5(e) is approximately the same as that in Figure 1 in terms of overall silhouette, but differs from that in Figure 1 in that the engagement piece 15 is molded separately and that its material is not the elastic material that constitutes the inner seal portion 14.

[0074] The engaging piece 15 is an annular plate made of a synthetic resin material, such as hard PET, that is more rigid than the material of the inner seal portion 14. The annular plate acts as the engaging piece 15 by being inserted into an insertion groove 14g provided on an inner peripheral end face 14d of the inner seal body 14a of the inner seal portion 14.

[0075] This engagement piece 15 has lower elasticity than the engagement piece 15 used in Figure 1, etc., and the elastic deformation of the engagement piece 15 itself when the inner seal portion 14 elastically deforms is smaller than that of the inner seal portion 14. However, the entire inner seal portion 14 bends so as to fall into the space of the insertion hole 2, and as a result of this movement, the engagement is released and the piece tilts, as in Figure 3(b).

[0076] Since the engaging piece 15 is molded separately in this manner, the dimensions of the engaging piece 15 can be varied and the engaging piece 15 can be replaced to match the diameter of the shaft portion 32 of the bolt 30.

[0077] 5, i.e., the mounting structure to the bolt 30 and the mating member 1. For these seal washers 10B to 10F, the above-mentioned relational expressions need only be satisfied between the diameters r1 and r4 of the respective parts, the diameter r3 of the insertion hole 2 of the mating member 1, and the diameter r2 of the bolt head 31. As mentioned above, for the seal washers 10B and 10C shown in Fig. 5(b) and (c), the relation of inner diameter r1 of outer seal portion 13 > outer diameter r2 of bolt head 31 does not necessarily have to be satisfied.

[0078] Also, as shown in FIG. 6, a seal washer 10G in which the engagement pieces 15 are formed intermittently along the circumferential direction, that is, in which the engagement pieces 15 are composed of a plurality of separation pieces 16, can be used.

[0079] If the engagement pieces 15 are formed intermittently along the circumferential direction in this way, the engagement of the bolt 30 with the shank 32 is easily released as the bolt 30 is screwed in, reducing the reaction force of the engagement pieces 15 and making it easier to use. In particular, if a separately molded hard separation piece 16 is used, it is convenient because the separation makes it easier to release the engagement. Also, in the case of a separately molded engagement piece 15, the separation piece 16 makes it easier to attach, which is convenient.

[0080] 6 is generally similar to that of FIG. 1 except for the shape and configuration of the engagement piece 15, the same components are given the same reference numerals in FIG. 6 and the description thereof will be omitted.

[0081] In the above embodiment, an example has been shown in which the fastening portion 31 of the fixing device 30 is the bolt head 31, but the fastening portion 31 may be a nut or a ring washer. In other words, the seal washer 10, 10A to 10G may be disposed between the nut or ring washer and the mating member 1.

[0082] Furthermore, the female thread portion 21 of the mounting member 20 may be a female thread portion 21 formed by burring instead of a recessed nut portion. It goes without saying that the seal washers 10, 10A to 10G and the mounting structures of the seal washers 10, 10A to 10G according to the above-described embodiments are merely examples, and the configurations and shapes can be appropriately changed to those other than those shown in the drawings. [Explanation of symbols]

[0083] 1 Counterpart 1a surface 2 Insertion hole 10, 10A~10G Seal washer 11 Core material 11a Core body 11aa Fixed side surface 11ab Counterpart surface 11b Seal base 12 Elastic seal part 12a Joint 13 Outer seal 13a Outer seal (fixed side) 13b Outer seal (mating side) 14 Inner seal 14a Inner seal body 14b Fixed side protrusion 14c Convex part on the other side 14d Inner circumference end face 15 Engagement piece 15a Tip 16 Separation piece 20 Mounting material 21 Female thread part (embedded nut part) 30 Fixtures (bolts) 31 Fastening part (bolt head) 32 Shaft r1 Inner diameter of outer seal r2 Outer diameter of fastening part (bolt head) r3 Diameter of the insertion hole of the mating part r4 Inner diameter of core

Claims

1. A seal washer is disposed between a fastening portion of a fixture having a fastening portion and a shaft portion and a mating member having an insertion hole through which the shaft portion is inserted, The seal member includes an annular core material, an outer seal portion made of an elastic material and attached to an outer peripheral end portion of the core material, and an inner seal portion made of an elastic material and attached to an inner peripheral end portion of the core material, The core material includes a core material body and a seal base portion extending outward from the core material body, The outer seal portion is disposed on one of two thickness-wise surfaces of the seal base, the surface facing the mating member, so as to protrude from a surface of the core body, the inner seal portion is disposed on an end surface on an inner circumferential side of the core body so as to protrude further inward and protrude beyond a surface of the core body toward the fastening portion, A seal washer characterized in that the inner diameter of the outer seal portion is larger than the diameter of the insertion hole, the diameter of the insertion hole is larger than the inner diameter of the core material, and the outer diameter of the fastening portion is larger than the inner diameter of the core material.

2. In claim 1, The inner seal portion further includes an engagement piece protruding inward from an end surface on an inner circumferential side thereof, A seal washer characterized in that the engaging piece is a plate-shaped piece thinner than the inner seal portion, and its tip engages with the circumferential surface of the shaft portion at least when the inner seal portion is not elastically deformed.

3. In claim 2, The seal washer is characterized in that the engagement pieces are formed intermittently along a circumferential direction.

4. In claim 2, A seal washer characterized in that a screw groove is formed on the shaft portion, and a tip of the engagement piece can engage with the screw groove.

5. A mounting structure for a seal washer is provided between a fastening portion of a fastener having a fastening portion and a shaft portion, and a mating member having an insertion hole through which the shaft portion is inserted, A mounting structure for a seal washer, comprising the seal washer according to any one of claims 1 to 4.

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