Fastening members and functional members

Abstract

This makes it difficult for functional members to peel off. [Solution] The fastening member (bolt 1) comprises a fastening portion (head 10) and a functional member (sealing function member 20) at least a portion of which is arranged between the fastening portion and the fastened surface, and the functional member comprises a flat portion (flat surface 21c) arranged so as to be able to come into contact with the fastened surface, and an inclined portion (inclined surface 21d) located closer to the outer periphery than the flat portion and inclined in a direction away from the fastened surface as it goes closer to the outer periphery.

Description

[Technical Field]

[0001] The present invention relates to a fastening member and a function-imparting member. [Background technology]

[0002] The following Patent Document 1 discloses a fastener body provided with a flange and a functional member provided with the flange. The functional member has multiple ribs formed thereon, and the tips of the ribs are positioned so as to contact the fastened members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7042948 Summary of the Invention [Problem to be solved by the invention]

[0004] When the fastener body disclosed in Patent Document 1 is tightened against the fastened members, the function-imparting member is pressed. At this time, the function-imparting member may bulge outward (in a direction intersecting with the pressing direction) due to the pressing force. When the function-imparting member bulges outward, the outer periphery of the function-imparting member may lift off the fastened members, causing curling.

[0005] In consideration of the above, the present disclosure aims to make it difficult for functional members to peel off. [Means for solving the problem]

[0006] The fastening member according to the first aspect of the present disclosure comprises a fastening portion and a function-imparting member, at least a portion of which is arranged between the fastening portion and the fastened surface, and the function-imparting member comprises a flat portion arranged so as to be in contact with the fastened surface, and an inclined portion provided on the outer periphery of the flat portion and inclined away from the fastened surface toward the outer periphery.

[0007] In the fastening member according to the first aspect of the present disclosure, when the function-imparting member is pressed when the fastened surface is fastened, the function of the function-imparting member (e.g., a waterproof function) is exerted when the flat portion and the fastened surface are in close contact with each other.

[0008] Furthermore, this function-imparting member has an inclined portion. If the function-imparting member does not have an inclined portion, when the function-imparting member is pressed, the pressed function-imparting member tends to bulge outward (in a direction intersecting the pressing direction). In contrast, if an inclined portion is formed, the inclined portion will be displaced in a direction approaching the fastened surface, but the function-imparting member is prevented from bulging outward until the inclined portion comes into contact with the fastened surface.

[0009] Therefore, compared to when the inclined portion is not formed, the function-imparting member is less likely to bulge outward and cause curling, thereby suppressing deterioration of the function (for example, deterioration of water-stopping properties) due to curling of the function-imparting member.

[0010] A fastening member according to a second aspect of the present disclosure is a fastening member according to the first aspect of the present disclosure, wherein the function-adding member is a sealing member having a sealing function that tightly contacts the fastened surface and prevents fluid from entering.

[0011] In the fastening member according to the second aspect of the present disclosure, deterioration of the water-stopping property and gas barrier property (airtightness) due to curling of the function-imparting member is unlikely to occur.

[0012] A fastening member according to a third aspect of the present disclosure is a fastening member according to the first aspect of the present disclosure, wherein the fastening portion has a shaft-side side surface arranged parallel to the fastened surface, and the flat portion is arranged in a position sandwiched between the fastened surface and the shaft-side side surface.

[0013] In the fastening member according to the third aspect of the present disclosure, the flat portion is pressed against the fastened surface from the shank-side side surface, thereby making it easier to ensure functionality compared to a configuration without a shank-side side surface.

[0014] A fastening member according to a fourth aspect of the present disclosure is a fastening member according to the third aspect of the present disclosure, wherein the fastening portion has a seat surface arranged parallel to the fastened surface, and before being tightened against the fastened surface, the distance between the upper end of the inclined portion and the fastened surface is equal to the distance between the seat surface and the fastened surface.

[0015] In the fastening member according to the fourth aspect of the present disclosure, a gap is less likely to occur between the outer periphery of the function-imparting member and the fastened surface, and functionality is less likely to be impaired, compared to when the separation distance between the upper end of the inclined portion and the fastened surface is "larger" than the separation distance between the seating surface and the fastened surface. Also, compared to when the seating surface and the fastened surface are "closer" than the separation distance, the outer periphery of the function-imparting member is less likely to be crushed and bulge outward, and functionality is less likely to be impaired.

[0016] A fastening member according to a fifth aspect of the present disclosure is a fastening member according to the fourth aspect of the present disclosure, wherein the seat surface is positioned inside the shaft side surface and closer to the fastened surface than the shaft side surface.

[0017] In the fastening member according to the fifth aspect of the present disclosure, the flat portion of the function-imparting member is pressed by the shaft-side surface on the outside of the seating surface, thereby allowing the function of the function-imparting member to be exerted on the outside of the seating surface.

[0018] A fastening member according to a sixth aspect of the present disclosure is a fastening member according to the first aspect of the present disclosure, in which the inclined portion is located at a position sandwiched between the outer peripheral edge of the fastening portion and the fastened surface.

[0019] In the fastening member according to the sixth aspect of the present disclosure, a portion of the fastening portion is located above the inclined portion, so that a pressing force (downward pressing force) from the fastening portion is reliably applied to the inclined portion, thereby deforming the inclined portion into a flat shape and contributing to improved watertightness.

[0020] A fastening member according to a seventh aspect of the present disclosure is a fastening member according to the first aspect of the present disclosure, wherein the functional member is molded using a first resin that is slidable relative to the fastening portion, and a second resin that is sandwiched between the first resin and the fastened surface and is softer than the first resin.

[0021] In a fastening member according to a seventh aspect of the present disclosure, the relatively hard first resin is slidable relative to the fastening portion, so that when the frictional force between the fastened surfaces and the second resin increases when the fastened surfaces are fastened, the interface between the first resin and the fastening portion slides, preventing excessive twisting of the second resin.

[0022] Furthermore, even when there is no large frictional force between the first resin and the fastened surface, the fastening portion slides against the first resin, making it difficult for the second resin to twist, and the function of the functional component (for example, water-stopping function) is maintained.

[0023] A fastening member according to an eighth aspect of the present disclosure is the fastening member according to the first aspect of the present disclosure, wherein the upper end surface of the function-imparting member is configured to be flush with the outer peripheral upper end surface of the fastening portion.

[0024] In the fastening member according to the eighth aspect of the present disclosure, pooling of water on the upper surface of the fastening portion can be suppressed compared to when the upper end surface of the function-imparting member is located at a higher position than the upper end surface of the fastening portion.

[0025] The functional member according to the ninth aspect of the present disclosure is a functional member at least a portion of which is arranged between a fastening portion and a fastened surface, and comprises a flat portion arranged so as to be able to come into contact with the fastened surface, and an inclined portion arranged on the outer periphery of the flat portion and inclined away from the fastened surface toward the outer periphery.

[0026] In the functional member according to the ninth aspect of the present disclosure, when the functional member is pressed when the fastening surface is tightened, the function of the functional member (e.g., waterproof function) is exerted when the flat portion and the fastening surface are in close contact with each other.

[0027] Furthermore, this function-imparting member has an inclined portion. If the function-imparting member does not have an inclined portion, the pressed function-imparting member tends to bulge outward. In contrast, if an inclined portion is formed, the inclined portion will be displaced in a direction approaching the fastened surface, but the function-imparting member is prevented from bulging outward until the inclined portion comes into contact with the fastened surface.

[0028] Therefore, compared to when the inclined portion is not formed, the function-imparting member is less likely to bulge outward and cause curling, thereby suppressing deterioration of the function (for example, deterioration of water-stopping properties) due to curling of the function-imparting member. [Effects of the Invention]

[0029] According to the present disclosure, it is possible to make it difficult for the functional member to curl up. [Brief explanation of the drawings]

[0030] [Figure 1] (A) is a front view showing a cross section of a sealing function-imparting member in a fastening member according to embodiment 1 of the present disclosure, (B) is a top view of the head side, and (C) is a cross section of the sealing function-imparting member. [Figure 2] FIG. 3 is a partially enlarged cross-sectional view of a sealing function-imparting member. [Figure 3] FIG. 1A is a front view showing a cross section of a sealing function-imparting member in a state where a bolt of a fastening member according to embodiment 1 of the present disclosure is screwed into a nut, and FIG. 1B is a cross section showing a state where the sealing function-imparting member is pressed. [Figure 4] FIG. 10 is a front view showing a cross section of a sealing function-imparting member in a fastening member according to a second embodiment of the present disclosure. [Figure 5] FIG. 10 is a front view showing an example in which a sealing function-imparting member shown in cross section is configured to be detachable from a bolt. [Figure 6] FIG. 10 is a cross-sectional view showing a sealing function-imparting member of a fastening member according to a third embodiment of the present disclosure. [Figure 7]FIG. 10 is a cross-sectional view showing a sealing function-imparting member of a fastening member according to a fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, a fastening member and a function-imparting member according to an embodiment of the present disclosure will be described with reference to the drawings. Components indicated by the same reference numerals in the various drawings are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0032] Furthermore, descriptions of overlapping configurations and symbols in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting configurations, replacing them with different configurations, or combining one embodiment with various modified examples, within the scope of the purpose of the present disclosure.

[0033] <Embodiment 1> 1 shows a screw fastener, which is a fastening member, according to a first embodiment of the present disclosure. In this first embodiment, the present disclosure is applied to a bolt 1, which is a male threaded member that constitutes a screw fastening portion. Note that the following description will be given taking as an example a form in which the bolt 1 is fastened to a fastened member 200 from above, but this is merely one example, and it goes without saying that the fastening direction of the bolt 1 relative to the fastening object may be set as appropriate, such as diagonally or left-right.

[0034] First, the overall configuration will be described with reference to Figures 1(A) and 1(B). Figure 1(A) is a front view showing a cross section of the sealing function-imparting member of bolt 1, and Figure 1(B) is a top view of the head side of the bolt.

[0035] The bolt 1 comprises a head 10 as a fastening portion having a bearing surface 17, and a shank 13. The shank 13 is formed with a male thread 13a that fastens the bearing surface 17 of the head 10 against the surface of a fastened member 200 (an example of a fastened surface in this disclosure). The bolt 1 is made of a metal such as steel, but is not limited to this, and may be made of a non-ferrous metal such as aluminum or copper, or may be made of resin.

[0036] The head 10 is provided with a flange-shaped annular protrusion 16 that protrudes outward (radially outward from the shaft 13). This annular protrusion 16 is formed on the head 10 on the side of the workpiece 200.

[0037] An annular sealing function-imparting member 20 serving as a function-imparting member is disposed between the annular protrusion 16 and the surface of the workpiece 200. The sealing function-imparting member 20 is a sealing member that is compressed when the seating surface 17 is tightened against the workpiece 200, and comes into close contact with the surface of the workpiece 200, thereby having a sealing function that inhibits (seals) the intrusion of fluids. Fluids that can be sealed by the sealing function-imparting member 20 include liquids such as water, and gases such as various gases and air.

[0038] The sealing function-imparting member 20 has at least a two-layer structure consisting of a sliding portion 22 as a first additional portion that contacts the annular protrusion 16, and a sealing portion 21 as a second additional portion that contacts the surface of the workpiece 200. The head portion 10 and the shank 13 that are provided with the annular protrusion 16 are made of, for example, metal.

[0039] The head 10 comprises a hexagonal prism-shaped head body 11 that transmits torque from the tightening tool, an annular protrusion 16 that extends out to a diameter greater than the diagonal distance of the head body 11, and a seat 17 that has a smaller diameter than the annular protrusion 16 and protrudes from the annular protrusion 16 toward the fastened member 200.

[0040] Next, with reference to Fig. 1(C), a detailed description will be given of the configuration of the sealing function adding member 20 and the mounting portion of the sealing function adding member 20. Fig. 1(C) is a partially enlarged cross-sectional view of the mounting portion of the sealing function adding member 20.

[0041] The annular protrusion 16 protrudes all around from the head body 11. A head body side surface 16a and a shank side surface 16b of the annular protrusion 16 are surfaces that are perpendicular to the central axis N. Furthermore, the outer peripheral surface 16c of the annular protrusion 16 is a surface that has an outwardly convex arc-shaped cross section when viewed in a cross section cut along a plane passing through the central axis N. The head body side surface 16a and the shank side surface 16b are flat surfaces that are arranged parallel to the surface of the workpiece 200.

[0042] Here, the term "flat surface" includes a completely flat surface, and also includes a plane having a degree of roughness that is acceptable in the technical field to which the present disclosure pertains. In addition, the entire flat portion does not need to be a flat surface, as long as a contact area sufficient to exhibit sealing properties is secured.

[0043] In addition, a seat surface 17 is formed on the shaft-side side surface 16b of the annular protrusion 16. The seat surface 17 is formed on the inside of the shaft-side side surface 16b of the annular protrusion 16, closer to the workpiece 200 than the shaft-side side surface 16b, and is a flat surface arranged parallel to the surface of the workpiece 200.

[0044] The fact that the head body side surface 16a, the shaft side surface 16b, and the seat surface 17 are "parallel" to the surface of the workpiece 200 means that they are parallel within the allowable error range. Therefore, the head body side surface 16a, the shaft side surface 16b, and the seat surface 17 may be inclined relative to the surface of the workpiece 200 at an angle not exceeding 2 degrees.

[0045] The shaft-side side surface 16b of the annular protrusion 16 is located a predetermined height closer to the head body 11 than the seat surface 17, and a second inclined surface 17a is formed between the outer edge of the seat surface 17 and the inner edge of the shaft-side side surface 16b of the annular protrusion 16, which gradually expands in diameter from the seat surface 17 side toward the annular protrusion 16.

[0046] Next, a description will be given of the sealing function-imparting member 20. The sliding portion 22 of the sealing function-imparting member 20 is slidable relative to the annular protrusion 16, and is formed using a first resin. Details of the first resin will be described later.

[0047] The sliding portion 22 is an annular member that fits onto the annular protrusion 16 and has a U-shape lying on its side. The sliding portion 22 has a first side surface covering portion 22a, a second side surface covering portion 22b, and an outer peripheral covering portion 22c. The outer peripheral covering portion 22c is a portion that covers the outer peripheral surface 16c of the annular protrusion 16. The first side surface covering portion 22a extends inward (toward the central axis N) from one end of the outer peripheral covering portion 22c and covers the outer portion of the head body side surface 16a of the annular protrusion 16. The second side surface covering portion 22b extends inward from the other end of the outer peripheral covering portion 22c and comes into contact with the shaft portion side surface 16b of the annular protrusion 16. The upper end surface of the first side surface covering portion 22a is formed at a position higher than the upper end surface of the annular protrusion 16 (here, the shaft portion side surface 16b).

[0048] The inner peripheral shape of outer peripheral covering portion 22c of sliding portion 22 corresponds to the outer peripheral shape of annular protrusion 16, and sealing function adding member 20 is able to slide in the rotational direction at the interface with annular protrusion 16. The inner peripheral surface of outer peripheral covering portion 22c has an arc-shaped cross section following the outer peripheral surface 16c of annular protrusion 16, and the inner surfaces of first side surface covering portion 22a and second side surface covering portion 22b are flat surfaces following the head body side surface 16a and shaft side surface 16b of annular protrusion 16, and sealing function adding member 20 slides smoothly in contact with annular protrusion 16.

[0049] Regarding the outer peripheral shape of the sliding portion 22, the outer peripheral surface of the outer peripheral covering portion 22c is a cylindrical surface, and the outer peripheral surfaces of the first side surface covering portion 22a and the second side surface covering portion 22b are surfaces that are perpendicular to the central axis N. A first notch 22d with an inverted radius (concave radius) is provided at the corner between the outer peripheral surface of the outer peripheral covering portion 22c and the outer peripheral surface of the first side surface covering portion 22a. Note that instead of the first notch 22d, a tapered C-chamfer or a radius chamfer may be formed at the corner between the outer peripheral surface of the outer peripheral covering portion 22c and the outer peripheral surface of the first side surface covering portion 22a. Alternatively, such first notch 22d or chamfer may be omitted, and the outer peripheral surface of the outer peripheral covering portion 22c and the outer peripheral surface of the first side surface covering portion 22a may intersect at a right angle.

[0050] In addition, a second notch 22e with an inverted radius is also provided at the corner between the outer peripheral surface of the outer peripheral covering portion 22c and the second side surface covering portion 22b. The corner between this second notch 22e and the second side surface covering portion 22b has a convex radius. Note that, instead of the second notch 22e, a tapered C-chamfer or a radius chamfer may be formed at the corner between the outer peripheral surface of the outer peripheral covering portion 22c and the second side surface covering portion 22b. Alternatively, such second notch 22e or chamfer may be omitted so that the outer peripheral surface of the outer peripheral covering portion 22c and the second side surface covering portion 22b intersect at a right angle.

[0051] The outer peripheral shape of this sliding portion 22 does not constitute a sliding surface, so that the cross-sectional shape perpendicular to the central axis N may be a polygonal shape such as a square or a triangle, or may be an uneven shape with serrations on the outer periphery, and various shapes can be selected.

[0052] The height of the outer surface of second side surface covering portion 22b is higher by a predetermined dimension than seat surface 17. In addition, the end of second side surface covering portion 22b has a rounded shape that follows the rounded shape of the corner between shaft-side side surface 16b of annular protrusion 16 and second inclined surface 17a, and is in close contact with the corner.

[0053] The seal portion 21 is an annular seal member that is joined to the second side surface covering portion 22b of the sliding portion 22. The seal portion 21 is disposed between the sliding portion 22 and the surface of the fastened member 200, and is formed using a second resin that is softer than the sliding portion 22. Details of the second resin will be described later.

[0054] The seal portion 21 has a first side surface 21a, a second side surface 21b, a flat surface 21c, and an inclined surface 21d. A corner between the first side surface 21a and the inclined surface 21d, a corner between the inclined surface 21d and the flat surface 21c, and a corner between the flat surface 21c and the second side surface 21b are chamfered.

[0055] The first side surface 21a and the second side surface 21b are surfaces along the central axis N. Of these, the first side surface 21a is configured to be flush with the outer peripheral surface of the outer peripheral covering portion 22c. In addition, the second side surface 21b is disposed outside the second inclined surface 17a.

[0056] The flat surface 21c is an example of a flat portion in the present disclosure, and is a surface that is arranged so as to be able to come into contact with the surface of the workpiece 200. The flat surface 21c is formed on the outer side of the second side surface 21b.

[0057] Inclined surface 21d is an example of an inclined portion in the present disclosure, and is a tapered surface connecting first side surface 21a and flat surface 21c. Inclined surface 21d is provided closer to the outer periphery than flat surface 21c, and is inclined so as to move away from the surface of workpiece 200 toward the outer periphery. Inclined surface 21d is formed in a flat shape (linear in cross-sectional view).

[0058] In addition, the inclined surface 21d is located at a position sandwiched between the outer peripheral edge of the annular protrusion 16 and the surface of the workpiece 200, i.e., below the outer peripheral surface 16c. More specifically, the inner end of the inclined surface 21d is located inside the outer peripheral surface 16c, and the outer end of the inclined surface 21d is located outside the outer peripheral surface 16c.

[0059] The upper surface of the seal portion 21 has a shape that follows the second side surface covering portion 22b and the second notch 22e of the sliding portion 22. In other words, the portion of the upper surface of the seal portion 21 that comes into contact with the second side surface covering portion 22b is flat, and the portion that comes into contact with the corner between the second notch 22e and the second side surface covering portion 22b has a concave, curved shape. Note that the shape of the seal portion 21 is not limited to that shown in the drawing. The shape of the portion of the seal portion 21 that comes into contact with the sliding portion 22 can be changed as appropriate depending on the shape of the second notch 22e and whether or not the second notch 22e is present.

[0060] The flat surface 21c is formed at a position that protrudes from the seat surface 17 toward the fastened member 200 when the bolt 1 is not fastened. When the protruding height of the flat surface 21c from the seat surface 17 is (H), the protruding height (H1) of the flat surface 21c from the seat surface 17 is preferably in the range of (H1 / H) = 5 to 70%, and more preferably in the range of 10 to 40%.

[0061] 2, the flat surface 21c is located between the surface of the workpiece 200 and the flat shank-side side surface 16b. That is, the outer end P2 of the flat surface 21c is located more inward than the outer end P3 of the shank-side side surface 16b. In other words, the lower end of the inclined surface 21d is located more inward than the outer end P3 of the shank-side side surface 16b.

[0062] Furthermore, before tightening against the surface of the workpiece 200, the distance between the upper end P1 of the inclined surface 21d and the surface of the workpiece 200 is approximately equal to the distance (protrusion height H1) between the seat surface 17 and the surface of the workpiece 200 (matches within the allowable error range).

[0063] The "state before tightening against the surface of the fastened member 200" refers to the state before tightening of the bolt 1, in which the flat surface 21c is in contact with the surface of the fastened member 200, and no pressing force is applied from the flat surface 21c to the surface of the fastened member 200 (the sealing portion 21 is not compressed).

[0064] The upper end P1 of the inclined surface 21d is the point where an extension of the first side surface 21a intersects with an extension of the inclined surface 21d. The distance between the upper end P1 of the inclined surface 21d and the surface of the workpiece 200 does not necessarily have to exactly match the distance (protrusion height H1) between the bearing surface 17 and the surface of the workpiece 200. The distance between the upper end P1 of the inclined surface 21d and the surface of the workpiece 200 may be approximately 0.3H1 to 2.0H1.

[0065] The above-mentioned seal portion 21 is a sealing material that comes into close contact with the surface of the fastened member 200, and various materials used for sealing can be used as the above-mentioned second resin. For example, general rubber materials such as nitrile rubber, silicone rubber, and urethane rubber, resin materials such as fluororesin and polyethylene, and thermoplastic elastomers such as thermoplastic vinyl vinyl polymer (TPV) can be used.

[0066] Furthermore, sliding portion 22 is a portion that has the function of sliding on the contact surface with annular protrusion 16 due to friction acting on seal portion 21 during tightening. As the material for sliding portion 22, the above-mentioned first resin can be used, for example, a general rubber material such as nitrile rubber, silicone rubber, or urethane rubber, a resin material such as fluororesin or polyethylene, or a thermoplastic elastomer such as thermoplastic vinyl vinyl polymer (TPV).

[0067] When the second resin forming the sealing portion 21 and the first resin forming the sliding portion 22 are formed from different materials, it is preferable to make the sealing portion 21 relatively soft (low in hardness) to provide flexibility, and the sliding portion 22 relatively hard to enhance slidability. The same applies when the same material, such as a thermoplastic elastomer, is used as the material for the sealing portion 21 and the sliding portion 22. Furthermore, the hardness is set appropriately taking into consideration slidability and additional performance (for example, watertightness), etc.

[0068] In this embodiment, although not shown, the seal portion 21 and the sliding portion 22 are formed by insert molding. First, the sliding portion 22 of the sealing function-imparting member 20 is molded on the annular protrusion 16 of the bolt 1 by insert molding.

[0069] The seal portion 21 is then molded by insert molding into the bolt intermediate body on which the sliding portion 22 is molded. This eliminates the need for an assembly step for the sealing function-imparting member 20, making manufacturing easier. The surface of the annular protrusion 16 is smooth, and the molded sliding portion 22 is not adhered, allowing it to rotate and slide.

[0070] The sealing portion 21 is not limited to such insert molding. For example, if the material is not suitable for injection molding, such as Si rubber, it may be attached to the sliding portion 22 with double-sided tape or adhesive, or may be joined by ultrasonic welding or heat welding.

[0071] Next, the operation of the bolt according to this embodiment will be described. Figure 3 illustrates an example of the fastening configuration of the bolt 1, where (A) is a schematic cross-sectional view of the overall configuration and (B) is an enlarged cross-sectional view of a main part.

[0072] 3(A), this fastening configuration is such that a fastened member 200 is placed on a fixing member 201, and the shank 13 of the bolt 1 is passed through holes 200a, 201a in the fixing member 201 placed on top of the fastened member 200, and is screwed into a nut 204 (such as a weld nut) fixed to the fixing member 201, thereby tightening and fixing the fastened member 200. The fastening configuration is not limited to the illustrated example, and a screw hole may be provided directly in the fixing member 201 without using the nut 204.

[0073] 3(B), before tightening against the surface of the workpiece 200, the tip of the seal portion 21 is in contact with the surface of the workpiece 200. As the workpiece 200 is tightened further, the seal portion 21 is compressed, and the seat surface 17 comes into contact with the surface of the workpiece 200. Finally, the workpiece 200 is tightened to a predetermined axial force, completing the tightening operation. In the tightened state, the flat surface 21c and the inclined surface 21d of the seal portion 21 come into contact with the surface of the workpiece 200, as shown by the solid line.

[0074] In this embodiment, when the frictional force between the surface of the fastened member 200 and the sealing portion 21 increases during tightening of the fastened member 200, the interface at the contact point between the sliding portion 22 and the annular protrusion 16 slips, preventing excessive twisting of the soft sealing portion 21 constituting the sealing function-added member 20.

[0075] Furthermore, even when there is no large frictional force between the sealing portion 21 and the surface of the fastened member 200, the annular protrusion 16 slides against the sliding portion 22, making it difficult for the sealing portion 21 to twist, and the sealing function is maintained.

[0076] In addition, the contact surface pressure at the contact point between the sliding portion 22 and the annular protrusion 16, i.e., the contact surface pressure at the interface between the shaft side surface 16b of the annular protrusion 16 and the second side surface covering portion 22b of the sliding portion 22, increases, resulting in a tight fit without any gaps, and preventing the intrusion of fluids such as water and air.

[0077] Furthermore, since the bearing surface 17 directly or indirectly contacts the surface of the workpiece 200, the appropriate axial force can be secured and set high. In addition, the seal portion 21 is compressed in the process of obtaining the appropriate load.

[0078] In addition, when the above-mentioned rubber material, elastomer, resin material, etc. are used as the material for the sealing portion 21 and the sliding portion 22, these materials are electrically insulating materials with high electrical resistance (high insulating properties), and the sealing function-added member 20 of this embodiment 1 has not only a sealing function but also an electrical insulating function.

[0079] This prevents contact corrosion (galvanic corrosion) at the contact point between the sealing function-imparting member 20 and the surface of the fastened member 200. Furthermore, if the surface of the fastened member 200 or the bearing surface 17 of the head 10 is coated with an insulating film such as a cationic coating, the head 10 and the fastened member 200 can be insulated from each other.

[0080] <Action and effect> As shown in Figure 3(A), when the sealing function-imparting member 20 is pressed when the surface of the fastened member 200 is tightened using a bolt 1 and a nut 204, the function of the function-imparting member (e.g., water-stopping function or airtight function) is exerted when the flat surface 21c and the surface of the fastened member 200 are in close contact with each other, as shown in Figure 3(B).

[0081] In addition, an inclined surface 21d is formed on this sealing function member 20. If the inclined surface 21d were not formed on the sealing function member 20, when the sealing function member 20 was pressed, the pressed sealing function member 20 would easily bulge outward. In contrast, when the inclined surface 21d is formed, the inclined surface 21d is displaced in a direction approaching the fastened member 200, but the sealing function member 20 is prevented from bulging outward until the inclined surface 21d comes into contact with the fastened member 200.

[0082] Therefore, curling due to outward swelling of the sealing function-imparting member 20 is unlikely to occur, thereby suppressing deterioration of the function of the sealing function-imparting member 20 (for example, deterioration in watertightness or airtightness) due to curling.

[0083] In addition, the head body 11 has a shaft side surface 16b, which is a flat surface arranged parallel to the fastened member 200, and the flat surface 21c of the sealing function-added member 20 is arranged in a position sandwiched between the fastened member 200 and the shaft side surface 16b.

[0084] As a result, the flat surface 21c is pressed from the shaft-side side surface 16b, so that the entire flat surface 21c is brought into close contact with the fastened member 200. Therefore, sealing performance is easier to ensure compared to a configuration in which the shaft-side side surface 16b, which is a flat surface, is not present.

[0085] Furthermore, as shown in Figure 2, before this sealing function-added member 20 is tightened against the surface of the fastened member 200, the distance between the upper end P1 of the inclined surface 21d and the surface of the fastened member 200 is equal to the distance (protrusion height H1) between the seat surface 17 and the surface of the fastened member 200.

[0086] As a result, when tightening the fastened member 200, a gap is less likely to occur between the outer periphery of the sealing function-added member 20 and the surface of the fastened member 200, and water-stopping properties are less likely to be reduced, compared to when the distance between the upper end P1 of the inclined surface 21d and the surface of the fastened member 200 is "larger" than the distance between the seat surface 17 and the surface of the fastened member 200.

[0087] Furthermore, compared to when the distance between the upper end P1 of the inclined surface 21d and the surface of the fastened member 200 is "closer" than the distance between the seat surface 17 and the surface of the fastened member 200, the outer periphery of the sealing function-added member 20 is less likely to be crushed and bulge outward, and the water-stopping properties are less likely to be reduced.

[0088] Furthermore, in this sealing function-imparting member 20, the inclined surface 21d is disposed at a position sandwiched between the outer peripheral surface 16c of the annular protrusion 16 and the surface of the fastened member 200. With this configuration, a part of the annular protrusion 16 is positioned above the inclined surface 21d, so that the pressing force (downward pressing force) from the annular protrusion 16 is reliably applied to the inclined surface 21d. This allows the inclined surface 21d to be deformed into a flat shape, which contributes to improving watertightness.

[0089] Furthermore, when this sealing function-imparting member 20 is used, the side surface of the annular protrusion 16 is covered with the sliding portion 22, which is made of a resin that is harder than the sealing portion 21. As a result, when the frictional force between the surface of the fastened workpiece 200 and the sealing portion 21 increases during tightening of the workpiece 200, the interface at the contact point between the sliding portion 22 and the annular protrusion 16 slides, preventing excessive twisting of the soft sealing portion 21 that constitutes the sealing function-imparting member 20.

[0090] Furthermore, even when there is no large frictional force between the sealing portion 21 and the surface of the fastened member 200, the annular protrusion 16 slides against the sliding portion 22, making it difficult for the sealing portion 21 to twist, and the sealing function is maintained.

[0091] Furthermore, the sealing portion 21, which is made of a resin that is softer than the sliding portion 22, is sandwiched between the sliding portion 22 and the fastened member 200, so it is easy to deform when fastened to the fastened member 200, making it easy to achieve waterproof performance.

[0092] <Embodiment 2> Next, a screw fastener, which is a fastening member according to embodiment 2 of the present disclosure, will be described. Fig. 4 shows the screw fastener according to embodiment 2 of the present disclosure. In this embodiment 2, the present disclosure is applied to a nut 101, which is an example of an internally threaded member.

[0093] The nut 101 includes a nut body 110 having a seat surface 117, and a threaded hole 113. The threaded hole 113 is formed with an internal thread 113a for fastening the seat surface 117 of the nut body 110 to the workpiece 200.

[0094] The nut body 110 is provided with a flange-shaped annular protrusion 116, and an annular sealing function-imparting member 20 is attached to this annular protrusion 116, so that when tightened, the sealing function-imparting member 20 comes into close contact with the fastened member 200 to prevent fluid from entering. In this second embodiment, the nut body 110 corresponds to the fastening portion of the fastening member of the present disclosure.

[0095] The nut body 110 includes a hexagonal cylindrical body 111 that transmits torque from a tightening tool, an annular protrusion 116 that projects out with a diameter larger than the diagonal distance of the cylindrical body 111, and a seating surface 117 that has a smaller diameter than the annular protrusion 116 and protrudes from the annular protrusion 116 toward the fastened member 200. The configurations of the annular protrusion 116 and the seating surface 117 are the same as those of the annular protrusion 16 and the seating surface 17 except that the above-mentioned screw hole 113 is formed, so a description thereof will be omitted.

[0096] In the above second embodiment, a hexagonal nut with a flange has been described as an example, but the present disclosure is not limited to hexagonal nuts and can also be applied to square nuts, cap nuts, wing nuts, etc. In short, the present disclosure can be widely applied to various types of female threaded members that have an internally threaded member body as a fastener body having a seating surface, a threaded hole with an internal thread that tightens the seating surface of the female threaded member body against a fastened member, and a flange portion provided on the female threaded member body, and in which an annular member with a sealing function is attached to the flange portion.

[0097] In the above-mentioned embodiments 1 and 2, the sealing function-imparting member 20 is integrally molded with the annular protrusion 16, but the sealing function-imparting member 20 may be molded separately from the bolt 1 and the nut 101 and then assembled to the bolt 1 and the nut 101 in a detachable manner.

[0098] For example, Figure 5 shows an example in which the sealing function adding member 20 is detachably attached to the annular protrusion 16 of the bolt 1. In this way, when the useful life of the sealing function adding member 20 has expired or when the sealing function adding member 20 is damaged, only the sealing function adding member 20 can be replaced, thereby saving resources.

[0099] <Embodiment 3> Next, a third embodiment of the present disclosure will be described. Fig. 6 shows a screw fastener, which is a fastening member according to the third embodiment of the present disclosure. In this third embodiment, the present disclosure is applied to a bolt, which is an example of a male threaded member.

[0100] In the example shown in this figure, the shaft-side side surface 16b of the annular protrusion 16 forms the bottom surface of the head body 11, and the seat surface 17 in the above embodiment is not formed.

[0101] Unlike the seat surface 17 in the first embodiment, this shaft-side side surface 16b does not seat on the fastened workpiece 200 during fastening. In the third embodiment, only the seal portion 21 comes into contact with the fastened workpiece 200 during fastening, and this seal portion 21 also functions as an insulating member, which can contribute to preventing electrolytic corrosion.

[0102] Furthermore, in this sealing function-imparting member 20, the seal portion 21 is in close contact with the surface of the workpiece 200, rather than the annular protrusion 16 of the head 10 or the seat surface 17 of the first embodiment. Therefore, even when the head 10 is harder than the workpiece 200, such as when the head 10 is made of metal and the workpiece 200 is made of resin, damage to the workpiece 200 can be suppressed.

[0103] Compared to the first embodiment, the second side surface covering portion 22b of the sliding portion 22 extends to the inside of the head body 11, and the flat surface 21c of the sealing portion 21 covers almost the entire lower surface of the second side surface covering portion 22b.

[0104] Since this seal portion 21 forms a bearing surface in close contact with the surface of the fastened member 200, it is preferable to make it from a material with rubber-like elasticity in order to obtain frictional force during fastening. Therefore, by having rubber-like elasticity, it is possible to provide not only an insulating function but also a sealing function.

[0105] The sealing material described in embodiment 1 can be used as the material for this seal portion 21. For example, general rubber materials such as nitrile rubber, silicone rubber, and urethane rubber, resin materials such as fluororesin and polyethylene, and thermoplastic elastomers such as thermoplastic vinyl vinyl polymer (TPV) can be used. These sealing materials have high resistivity and can be used as electrical insulating materials.

[0106] The configuration of the head body 11 not including the seat surface 17 and the configuration of the seal portion 21 functioning as an insulating function-imparting member can also be applied to the nut 101 shown in FIG.

[0107] Furthermore, although the sealing portion 21 in embodiments 1 and 3 has been described as having both water-stopping and insulating properties, the functional member in the present disclosure may be one that has, for example, either water-stopping or insulating properties.

[0108] <Embodiment 4> Next, a fourth embodiment of the present disclosure will be described. Fig. 7 shows a screw fastening portion which is a fastening member according to the fourth embodiment of the present disclosure. In the first embodiment, the upper end surface of the first side surface covering portion 22a is formed at a position higher than the upper end surface of the annular protrusion 16, but in the fourth embodiment, the upper end surface of the first side surface covering portion 22a is formed flush with the upper end surface of the annular protrusion 16 (is on the same plane).

[0109] According to this embodiment, pooling of water on the upper surface of the annular protrusion 16 can be suppressed compared to when the upper end surface of the first side surface covering portion 22a is located higher than the upper end surface of the annular protrusion 16.

[0110] <Other embodiments> In the above embodiment, the surface of the workpiece 200 is cited as an example of the fastening surface of the present disclosure, but the embodiment of the present disclosure is not limited to this. For example, the fastening surface may be the surface of a structure such as a wall, a pillar, or a slab. In this case, the bolt 1 can be placed by embedding an anchor nut into these structures.

[0111] In addition, in the above embodiment, the inclined surface 21d is formed in a flat shape (linear in cross section), but the embodiment of the present disclosure is not limited to this. The inclined surface 21d may be formed in a curved shape (curved in cross section) or in a stepped shape.

[0112] In the above embodiment, the bolt 1 (see FIG. 1) having the shank 13 and the nut 101 (see FIG. 4) have been described as fastening members of the present disclosure, but the fastening members of the present disclosure are not limited to these. For example, a function-imparting member such as the sealing function-imparting member 20 can also be applied to a rivet that is fastened using caulking.

[0113] Furthermore, in the above embodiment, the head body side surface 16a and the shank side surface 16b of the annular protrusion 16 are flat surfaces arranged parallel to the surface of the workpiece 200, but the embodiment of the present disclosure is not limited to this. For example, the shank side surface 16b may be inclined with respect to the surface of the workpiece 200. In other words, the flat surface 21c of the seal portion 21 does not need to be sandwiched between the surface of the workpiece 200 and a flat surface of the annular protrusion 16 that is parallel to that surface.

[0114] Furthermore, in the above embodiment, before tightening against the surface of the fastened member 200, the distance between the upper end P1 of the inclined surface 21d and the surface of the fastened member 200 is equal to the distance (protrusion height H1) between the seat surface 17 and the surface of the fastened member 200, but the embodiments of the present disclosure are not limited to this.

[0115] Furthermore, in the above embodiment, the seat surface 17 is formed on the inside of the shaft-side side surface 16b of the annular protrusion 16, i.e., the central portion of the head 10 (seat surface 17) protrudes downward relative to the outer periphery (annular protrusion 16), but the embodiments of the present disclosure are not limited to this.

[0116] For example, the outer periphery of the head 10 may protrude downward relative to the center. In this case, the sealing function-imparting member 20 may be provided on the protruding outer periphery or on the center.

[0117] In addition, in the above embodiment, the inclined surface 21d is disposed below the outer peripheral edge of the annular protrusion 16, i.e., below the outer peripheral surface 16c, but the embodiment of the present disclosure is not limited to this. For example, the inclined surface 21d may be disposed inside the outer peripheral surface 16c (below the shaft-side side surface 16b) or outside the outer peripheral surface 16c.

[0118] In the above embodiment, the second resin forming the seal portion 21 is softer than the first resin forming the sliding portion 22, but the embodiment of the present disclosure is not limited to this. For example, the hardness of these resins may be the same. Furthermore, when the hardness of these resins is the same, the sliding portion 22 and the seal portion 21 may be integrally formed.

[0119] In the above embodiment, the head 10 of the bolt 1 has a head body 11 in the shape of a hexagonal prism, but the embodiment of the present disclosure is not limited to this. For example, the head 10 may have a rounded shape, with a head body having an upwardly convex curved surface, or the head 10 may have a flat shape. The head 10 may also have a shape with a recess (for example, a cross-shaped recess) into which the tip of a tool fits.

[0120] Furthermore, in the above embodiment, the bolt 1 has been described as an example of a fastening member, but the technology of the present disclosure may of course also be applied to a general male screw.

[0121] Furthermore, in the above embodiment, an example of adding a sealing function or an insulating function has been described, but this is merely one example. The sealing function-adding member 20 may also contribute to adding a function of sandwiching another member (e.g., a resin panel member) between the fastened member 200 and the bolt 1. In this case, for example, a portion of the fastened member 200 (a portion facing the seat surface 17) protrudes toward the bolt 1 (embossed shape), and the panel member is arranged around it. The panel member is then pressed and sandwiched between the inclined surface 21d and flat surface 21c of the sealing function-adding member 20. Furthermore, the panel member is not limited to being made of resin, and may be a metal (e.g., aluminum) panel member or a CFRP panel member.

[0122] In these various embodiments, if the inclined surface 21d is provided on the outer circumferential side of the flat surface 21c, the effect of making the functional member less likely to curl up can be obtained compared to a configuration without the inclined surface 21d. [Industrial Applicability]

[0123] The fastening member and functional member of the present disclosure can be widely applied to prevent water intrusion, for example, in fastening parts for an automobile instrument panel hose to the body, fastening parts for a roof rail to the body, fastening parts for a rear spoiler to the body, fastening parts for a battery case to the body, and water-proofing parts for the inside of a battery case. They can also be widely applied to prevent gas leakage, for example, in attachment parts for covers that separate organic solvent gas from an environment where sparks are generated.

[0124] <Additional Notes> (1) A fastening portion; a functional member at least a portion of which is disposed between the fastening portion and the fastened surface; Equipped with The function-imparting member is a flat portion arranged to be able to come into contact with the fastened surface; an inclined portion provided on the outer periphery side of the flat portion and inclined so as to move away from the fastened surface toward the outer periphery side, Fastening member.

[0125] (2) The function-imparting member is a sealing member having a sealing function of tightly contacting the fastened surface to prevent the intrusion of fluid. (1) A fastening member as described above.

[0126] (3) The fastening portion has a shaft portion-side side surface that is arranged parallel to the fastened surface, The flat portion is disposed at a position sandwiched between the fastened surface and the shaft portion side surface. A fastening member according to (1) or (2).

[0127] (4) The fastening portion has a bearing surface disposed parallel to the fastened surface, Before being fastened to the fastening surface, the distance between the upper end of the inclined surface and the fastening surface is equal to the distance between the seat surface and the fastening surface. (3) A fastening member as described above.

[0128] (5) The seating surface is disposed inside the shaft portion side surface and closer to the fastened surface than the shaft portion side surface. (4) A fastening member according to the present invention.

[0129] (6) The inclined portion is located at a position sandwiched between an outer peripheral edge of the fastening portion and the fastened surface. A fastening member according to any one of (1) to (5).

[0130] (7) The function-imparting member is a first resin that is slidable relative to the fastening portion; a second resin that is sandwiched between the first resin and the fastening surface and is softer than the first resin; A fastening member according to any one of (1) to (6).

[0131] (8) The upper end surface of the function-imparting member is configured to be flush with the outer peripheral upper end surface of the fastening portion. A fastening member according to any one of (1) to (7).

[0132] (9) A functional member at least a part of which is disposed between the fastening portion and the fastened surface, a flat portion arranged to be able to come into contact with the fastened surface; an inclined portion provided on the outer periphery side of the flat portion and inclined so as to move away from the fastened surface toward the outer periphery side, Functionality-adding components. [Explanation of symbols]

[0133] 10 Head (fastening part) 11 Head body (fastening part) 16 Annular protrusion (fastening part) 17 Seat 20 Sealing function added parts (function added parts) 21 Sealing part (second resin) 21c flat surface 21d Slope 22 Sliding part (first resin) 101 Nut (fastening part) 110 Nut body (fastening part) 111 Cylindrical body (fastening part) 116 Annular protrusion (fastening part) 117 Seat 200 Parts to be fastened 204 Nut (fastening part)

Claims

1. A fastening portion; a functional member at least a portion of which is disposed between the fastening portion and the fastened surface; Equipped with The fastening portion is A shaft portion side surface, a bearing surface formed closer to the fastened surface than the shaft portion side surface and arranged parallel to the shaft portion side surface, The function-imparting member is a flat portion arranged at a position sandwiched between the fastened surface and the shaft portion side surface so as to be able to come into contact with the fastened surface; An inclined portion that connects the flat portion and the outer peripheral surface and is inclined toward the outer peripheral surface so as to move away from the fastened surface, Fastening member.

2. The function-imparting member is a sealing member having a sealing function of tightly contacting the fastened surface to prevent the intrusion of fluid. The fastening member according to claim 1 .

3. The shaft side surface is arranged parallel to the fastening surface, The fastening member according to claim 1 .

4. The seating surface is arranged parallel to the fastened surface, Before being fastened to the fastening surface, the distance between the upper end of the inclined portion and the fastening surface is equal to the distance between the seat surface and the fastening surface. The fastening member according to claim 3 .

5. The seat surface is disposed on the inner side of the shaft portion side surface. The fastening member according to claim 4 .

6. The inclined portion is located at a position sandwiched between an outer peripheral edge of the fastening portion and the fastened surface. The fastening member according to claim 1 .

7. The function-imparting member is a first resin that is slidable relative to the fastening portion; a second resin that is sandwiched between the first resin and the fastening surface and is softer than the first resin; The fastening member according to claim 1 .

8. The upper end surface of the function-imparting member is configured to be flush with the outer peripheral upper end surface of the fastening portion. The fastening member according to claim 1 .

9. A fastening portion; a functional member at least a portion of which is disposed between the fastening portion and the fastened surface; Equipped with The function-imparting member is a first resin that is slidable relative to the fastening portion; a second resin that is sandwiched between the first resin and the fastened surface and is softer than the first resin; The second resin is a flat portion arranged to be able to come into contact with the fastened surface; An inclined portion that connects the flat portion and the outer peripheral surface and is inclined toward the outer peripheral surface so as to move away from the fastened surface, Fastening member.

10. A fastening portion; a functional member at least a portion of which is disposed between the fastening portion and the fastened surface; Equipped with The function-imparting member is a flat portion arranged to be able to come into contact with the fastened surface; an inclined portion provided on the outer periphery side of the flat portion and inclined so as to move away from the fastened surface toward the outer periphery side, The fastening portion has a shaft portion-side surface, the flat portion is disposed at a position sandwiched between the fastened surface and the shaft portion side surface, The fastening portion has a seat surface, Before being fastened to the fastened surface, the distance between the upper end of the inclined portion and the fastened surface is equal to the distance between the seat surface and the fastened surface, The seating surface is disposed inside the shaft portion side surface and closer to the fastened surface than the shaft portion side surface. Fastening member.

11. A functional member at least a part of which is disposed between the fastening portion and the fastened surface, a first resin that is slidable relative to the fastening portion; a second resin that is sandwiched between the first resin and the fastened surface and is softer than the first resin; The second resin is a flat portion arranged to be able to come into contact with the fastened surface; An inclined portion that connects the flat portion and the outer peripheral surface and is inclined toward the outer peripheral surface so as to move away from the fastened surface, Functionality-adding components.

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