screw

Abstract

The present disclosure provides a bolt for joining a first member and a second member, the bolt being capable of correcting the position of the second member relative to the first member. A bolt (1) for joining a first member (7) and a second member (8) to a first hole (71) and a second hole (81) includes a flange portion (2), a threaded portion (3), a head portion (4), and a centering portion (5) having a centering portion body (52) and a plurality of blade portions (51), each blade portion (51) having an outer diameter increasing portion (53) in which the distance from the axis to the outer edge gradually increases toward the direction of the side opposite the tightening rotation direction of the bolt (1) and the distance from the axis to the outer edge gradually increases along the axis direction toward the flange portion (2).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a bolt. BACKGROUND

[0002] Conventionally, a bolt that joins a first member and a second member is known. In particular, a bolt that is used to correct the position of the second member with respect to the first member in a process of joining the first member and the second member using the bolt is known. For example, in Japanese Patent Application Laid-Open No. 2014-500444, a scheme is described in which a bolt with a centering cone, which is a circular truncated cone-shaped portion, is inserted into a hole of the first member and a hole of the second member, and the first member and the second member are joined while correcting the deviation between the axis of the hole of the first member and the axis of the hole of the second member. SUMMARY

[0003] PROBLEMS TO BE SOLVED BY THE INVENTION

[0004] In the bolt described in Japanese Patent Application Laid-Open No. 2014-500444, the face that divides the hole of the second member is brought into contact with the face of the centering cone that is the circular truncated cone-shaped portion, by inserting the bolt into the hole of the first member and the hole of the second member. Further, the second member slides along the face of the centering cone. Thus, the position of the second member with respect to the first member is corrected. However, in order to correct the position of the second member with respect to the first member by the bolt described in Japanese Patent Application Laid-Open No. 2014-500444, a strong force needs to be applied when the bolt is inserted into the hole of the first member and the hole of the second member in order to make the second member slide along the face of the centering cone. Therefore, a bolt that can more easily correct the position of the second member with respect to the first member is desired.

[0005] The present disclosure has been made in view of these circumstances, and aims to provide a bolt that joins a first member and a second member, and that can correct the position of the second member with respect to the first member.

[0006] MEANS FOR SOLVING THE PROBLEMS

[0007] In the bolt of the present disclosure,

[0008] has an axis, and is installed in a first hole of a first member and a second hole of a second member in order to join the first member and the second member, wherein the bolt includes:

[0009] a flange portion that abuts against the second member;

[0010] a threaded portion that is connected to the flange portion and is inserted into the first hole of the first member;

[0011] a head provided on a side of the flange portion opposite the threaded portion side; and

[0012] a centering portion provided between the flange portion and the threaded portion and inserted into the second hole of the second member,

[0013] the centering portion has a centering portion body and a plurality of blade portions provided on an outer periphery of the centering portion body and extending in a circumferential direction,

[0014] each blade portion has an outer diameter increasing portion in which a distance from the axis to an outer edge gradually increases toward a direction of a side opposite a fastening rotation direction of the bolt and a distance from the axis to the outer edge gradually increases in an axial direction toward the flange portion.

[0015] In the bolt of the present disclosure, it is preferable that

[0016] the outer diameter increasing portion has a first inclined surface and a second inclined surface located on the threaded portion side of the axial direction compared to the first inclined surface,

[0017] in a cross section of the bolt passing through the axis, the first inclined surface has a first angle θ1 inclined with respect to the axis, and the second inclined surface has a second angle θ2 inclined with respect to the axis,

[0018] the second angle θ2 is greater than the first angle θ1.

[0019] In the bolt of the present disclosure, it is preferable that

[0020] the first inclined surface and the second inclined surface are connected at an inclined surface ridge line,

[0021] the inclined surface ridge line is inclined in such a way as to move away from the flange portion toward the fastening rotation direction.

[0022] In the bolt of the present disclosure, it is preferable that

[0023] the centering portion has 3 or more and 6 or less of the blade portions.

[0024] In the bolt of the present disclosure, it is preferable that

[0025] a width of the blade portion in the axial direction is 0.7 mm or less.

[0026] In the bolt of the present disclosure, it is preferable that

[0027] a width of the blade portion in the axial direction is 0.8 times or more and 1 times or less of a thickness of the second member.

[0028] In the bolt of the present disclosure, it is preferable that

[0029] The maximum distance from the axis to the outer edge of the blade portion is 0.95 times or more and 1 times or less of the radius of the second hole.

[0030] Effects of Invention

[0031] According to the present disclosure, it is possible to provide a bolt that joins a first member and a second member, and the bolt can correct the position of the second member relative to the first member. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a perspective view showing one example of the bolt of the embodiment of the present disclosure.

[0033] Figure 2 is a perspective view showing one example of the bolt of the embodiment of the present disclosure.

[0034] Figure 3 is a cross-sectional view showing one example of the state in which the bolt of the embodiment of the present disclosure joins a first member and a second member.

[0035] Figure 4 is a cross-sectional view showing another example of the state in which the bolt of the embodiment of the present disclosure joins a first member and a second member.

[0036] Figure 5 is a cross-sectional view showing still another example of the state in which the bolt of the embodiment of the present disclosure joins a first member and a second member.

[0037] Figure 6 is a plan view showing one example of the bolt of the embodiment of the present disclosure.

[0038] Figure 7 is a cross-sectional view of the bolt of the embodiment of the present disclosure along Figure 6 the line VIIA-VIIA.

[0039] Figure 8 is a side view showing one example of the bolt of the embodiment of the present disclosure.

[0040] Figure 9 is a view showing the action of the bolt of the embodiment of the present disclosure.

[0041] Figure 10 is a cross-sectional view of the bolt of the embodiment of the present disclosure along Figure 7 the line X-X.

[0042] Figure 11 is a cross-sectional view of the bolt of the embodiment of the present disclosure along Figure 7 the line XI-XI.

[0043] Figure 12 is a side view showing a bolt of a comparative example.

[0044] Figure 13 is a cross-sectional view showing one example of a state in which the bolt of the modified example joins a plurality of members.

[0045] BRIEF DESCRIPTION OF DRAWINGS

[0046] 1 bolt; 2 flange portion; 3 threaded portion; 31 external thread; 32 threaded portion body; 4 head portion;

[0047] 5 centering portion; 51 blade portion; 52 centering portion body; 53 outer diameter increasing portion;

[0048] 531 outer diameter increasing surface; 532 first inclined surface; 533 second inclined surface; 534 inclined surface ridge line;

[0049] 54 connecting portion; 541 outer diameter decreasing surface; 55 ridge line; 7 first member; 71 first hole;

[0050] 72 internal thread; 8 second member; 81 second hole. DETAILED DESCRIPTION

[0051] First, referring to Figures 1 to 11 , a bolt of the embodiment of the present disclosure will be described. The bolt of the embodiment of the present disclosure is a bolt 1 that joins a first member 7 having a first hole 71 and a second member 8 having a second hole 81 as described later and enables correction of the position of the second member 8 with respect to the first member 7. The purpose of the bolt 1 is centering. That is, as described later, the bolt 1 has a function of correcting the position of the second member 8 with respect to the first member 7.

[0052] Here, Figure 1 is a perspective view showing the bolt 1. Figure 2 is a perspective view showing a state of the bolt 1 observed from a direction different from the observation direction in Figure 1 . As shown in Figure 1 and Figure 2 , the bolt 1 has an axis LA, and the bolt 1 includes a flange portion 2 that abuts against the second member, a threaded portion 3 that is linked to the flange portion 2 and is inserted into the first hole 71 of the first member 7, a head portion 4 that is provided on the side of the flange portion 2 opposite the threaded portion 3 side, and a centering portion 5 that is provided between the flange portion 2 and the threaded portion 3 and is inserted into the second hole 81 of the second member 8. In the example shown in Figure 1 and Figure 2 , the flange portion 2, the threaded portion 3, the head portion 4, and the centering portion 5 that constitute the bolt 1 are integrally formed. As shown in Figure 1 and Figure 2As shown, the threaded portion 3 has an external thread 31. The material of the bolt 1 is, for example, the same metal material as that of a common bolt.

[0053] The bolt 1 is rotated about the axis LA when the first member 7 and the second member 8 are joined. The direction of the axis LA is referred to as an axial direction DA, and the direction of rotation about the axis LA is referred to as a circumferential direction DB. In addition, in the axial direction DA, the direction in which the bolt 1 is entered when the bolt 1 is tightened is referred to as an entering direction SA1, and the direction in which the bolt 1 is retreated when the bolt 1 is loosened is referred to as a retreating direction SA2. In addition, the radial direction of the bolt 1 is referred to as a radial direction DC.

[0054] In the circumferential direction DB, the direction of rotation of the bolt 1 when the bolt 1 is tightened is referred to as a tightening rotation direction SB1. In addition, in the circumferential direction DB, the direction of rotation of the bolt 1 when the bolt 1 is loosened is referred to as a loosening rotation direction SB2.

[0055] Figure 3 is a cross-sectional view showing one example of a state in which the bolt 1 joins the first member 7 and the second member 8. Figure 3 The broken line shown is a line that simply shows the boundaries of the flange portion 2, the threaded portion 3, the head portion 4, and the centering portion 5. In Figure 3 In the example shown, as described above, the first member 7 has the first hole 71, and the second member 8 has the second hole 81. In Figure 3 In the example shown, the first member 7 and the second member 8 have a plate-like shape. As Figure 3 As shown, the bolt 1 is installed in the first hole 71 and the second hole 81 in order to join the first member 7 and the second member 8. The materials of the first member 7 and the second member 8 are not particularly limited as long as they are materials that can be joined by the bolt 1. The first member 7 and the second member 8 include, for example, at least one of a metal and a resin.

[0056] A thread 72 is provided on at least a portion of the inner wall of the first hole 71. In Figure 3 In the example shown, the first member 7 is a plate-like member that is formed integrally. In addition, in Figure 3In the example shown, the internal thread 72 is provided on the entire inner wall of the first hole 71. The second hole 81 has a size that allows the threaded portion 3 to pass therethrough. The second hole 81 has a diameter that is larger than the maximum width of the threaded portion 3 in the radial direction DC. Further, the threaded portion 3 has a threaded portion body 32 and an external thread 31 provided on the threaded portion body 32, as will be described later. In the present embodiment, the threaded portion 3 is caused to enter the first hole 71 from the front end on the entering direction SA1 side, and the bolt 1 is rotated in the fastening rotation direction SB1, whereby the external thread 31 is caused to engage with the internal thread 72, and the bolt 1 is fastened with respect to the first member 7. The threaded portion 3 is caused to pass through the inside of the second hole 81, and the external thread 31 is caused to engage with the internal thread 72, whereby the bolt 1 is fastened with respect to the first member 7. Thus, the first member 7 and the second member 8 can be joined by the bolt 1. Further, in a state where the first member 7 and the second member 8 have been joined by the bolt 1 as shown in Figure 3 the first member 7 and the second member 8 have been joined by the bolt 1 as shown in

[0057] In a state where the first member 7 and the second member 8 have been joined by the bolt 1 as shown in Figure 3 the first member 7 is an integrally formed plate-like member and has the internal thread 72 provided on the inner wall of the first hole 71, the first member 7 is made of, for example, metal. In a case where the first member 7 is made of metal, when a force is applied to the internal thread 72, such as when the external thread 31 is caused to engage with the internal thread 72, the durability of the internal thread 72 is improved.

[0058] Note that the form of the first member 7 is not limited to Figure 3 the form shown in FIG. 1. Further, among the forms of the first member 7, there is also included a form in which the first member 7 is made of resin or the like that has low mechanical strength, and the internal thread 72 is not cut out in the first hole 71 before the threaded portion 3 is inserted into the first hole 71, but the internal thread 72 is formed in the first hole 71 by inserting the threaded portion 3 into the first hole 71 and fastening the bolt 1. Figure 4 is a cross-sectional view showing a form in which the bolt 1 joins the first member 7 and the second member 8, which is different from Figure 3 . Further, Figure 5 is a cross-sectional view showing a form in which the bolt 1 joins the first member 7 and the second member 8, which is different from Figure 3 and Figure 4 . Further, Figure 4 and Figure 5 the dashed lines shown in FIG. 1 are lines that simply show the boundaries of the flange portion 2, the threaded portion 3, the head portion 4, and the centering portion 5.

[0059] InFigure 4 In the example shown, the first component 7 has a component body 73 and a nut 74. The component body 73 has a plate-like shape. Additionally, the component body 73 has a body hole 731. The body hole 731 is sized to allow the threaded portion 3 of the bolt 1 to pass through. Figure 4 In this case, no internal thread 72 is provided on the inner wall of the body hole 731. The nut 74 is, for example, a nut of a general shape. The nut 74 has a nut hole 741. An internal thread 72 is provided on the inner wall of the nut hole 741. Figure 4 As shown, the nut 74 is positioned such that the nut hole 741 coincides with the body hole 731, and is fixed to the component body 73 by welding or other means. Thus, the body hole 731 and the nut hole 741 constitute the first hole 71. As described above, since the inner wall of the nut hole 741 has an internal thread 72, but the inner wall of the body hole 731 does not have an internal thread 72, an internal thread 72 is provided on a portion of the inner wall of the first hole 71. Figure 4 In the first component 7 shown, the material of the component body 73 is, for example, metal. The material of the nut 74 is, for example, metal.

[0060] exist Figure 5 In the example shown, the first component 7 has a component body 73 and an insert nut 75. In Figure 5 In the example shown, the component body 73 has a recessed hole 76. An insert nut 75 is recessed in the recessed hole 76. The contact surface between the insert nut 75 and the inner wall of the recessed hole 76 has an uneven shape. Because the contact surface between the insert nut 75 and the inner wall of the recessed hole 76 has an uneven shape, it is possible to prevent the insert nut 75 from dislodging from the recessed hole 76. Figure 5 In the example shown, the first hole 71 is provided in the insert nut 75 in the first component 7. In addition, the internal thread 72 is provided on the entire inner wall of the first hole 71 (the first hole 71 is provided in the insert nut 75).

[0061] exist Figure 5 The method of forming the first component 7 having a component body 73 and an insert nut 75 embedded in the embedding hole 76 of the component body 73 is not particularly limited. Figure 5 The first component 7 shown, having a component body 73 and an insert nut 75, can be formed, for example, by flaring, pressing, hot pressing, or simultaneous molding. Figure 5 In the first component 7 shown, the material of the component body 73 is, for example, resin. The material of the insert nut 75 is, for example, metal.

[0062] like Figure 5As shown, according to the first member 7 having the member body 73 and the insert nut 75, the material of the insert nut 75 provided with the first hole 71 can be metal. Thus, the material of the member body 73 can be a material other than metal, such as resin, and the inner wall of the first hole 71 provided with the internal thread 72 can be composed of metal, thereby enabling improvement of the durability of the internal thread 72.

[0063] In Figure 4 and Figure 5 the examples shown, after passing the threaded portion 3 through the second hole 81, the external thread 31 of the threaded portion 3 can be engaged with the internal thread 72 provided in the first hole 71, thereby enabling the first member 7 and the second member 8 to be joined by the bolt 1.

[0064] As one example, the planar shape of the first member 7 is larger than the planar shape of the second member 8. In Figures 3 to 5 the example shown, the first member 7 and the second member 8 have a plate-like shape. In addition, the thickness of the first member 7 is larger than the thickness of the second member 8. In addition, the area of the largest face of the first member 7 is larger than the area of the largest face of the second member 8. As one example, the first member 7 is a member used in the formation of the outer shape of a product to be manufactured, such as the body and frame of an automobile, and the housing of a machine or electronic device, using the bolt 1. In this case, the second member 8 is a member mounted to the example first member 7.

[0065] Next, each structural element of the bolt 1 will be described further.

[0066] First, the flange portion 2 of the bolt 1 will be described. As shown in Figures 3 to 5 , the flange portion 2 abuts against the second member 8. In Figures 1 to 5 the example shown, the flange portion 2 has a first face 2a on the retreat direction SA2 side of the bolt 1, a second face 2b on the approach direction SA1 side of the bolt 1, and a third face 2c forming the outer surface in the radial direction DC. As shown in Figures 3 to 5 , the flange portion 2 abuts against the second member 8 at the second face 2b.

[0067] Figure 6 is a plan view showing the shape of the bolt 1 as viewed from the axial direction DA. Figure 6 Particularly, the shape of the bolt 1 as viewed from the threaded portion 3 side is shown. In Figure 6 , the illustration of the external thread 31 of the threaded portion 3 of the bolt 1 is omitted, and the outer shape of the threaded portion body 32 in the threaded portion 3 is illustrated. As shown in Figure 6 , as viewed from the threaded portion 3 side, the flange portion 2 has a circular profile centered on the axis LA.

[0068] Next, the threaded portion 3 of the bolt 1 will be described. The threaded portion 3 is connected to the flange portion 2 and is inserted into the first hole 71 of the first member 7. As shown in Figures 3 to 5 , at least a part of the threaded portion 3 is positioned in the first hole 71 of the first member 7 in a state where the first member 7 and the second member 8 are joined by the bolt 1. As shown in Figures 3 to 5 , the threaded portion 3 is positioned on the entering direction SA1 side of the flange portion 2 and is connected to the flange portion 2 via the centering portion 5. In the example shown in Figures 3 to 5 , the threaded portion 3 has a part positioned in the first hole 71 and a part positioned in the second hole 81. Although not shown, the threaded portion 3 can also not have a part positioned in the second hole 81 in a state where the first member 7 and the second member 8 are joined by the bolt 1.

[0069] As described above, the threaded portion 3 has a threaded portion body 32 and an external thread 31 provided to the threaded portion body 32. The threaded portion body 32 has a substantially cylindrical shape extending in the axial direction DA. The threaded portion body 32 has a rotationally symmetrical shape with the axis LA as the center. The external thread 31 is provided to the side surface of the threaded portion body 32. The external thread 31 is provided in a spiral shape around the threaded portion body 32.

[0070] Next, the head portion 4 will be described. The head portion 4 is provided to the side of the flange portion 2 opposite the side of the threaded portion 3. In other words, the head portion 4 is provided to the retreating direction SA2 side of the flange portion 2. As one example, when the bolt 1 is rotated to engage the external thread 31 with the internal thread 72 so as to tighten the bolt 1 with respect to the first member 7, the head portion 4 is held by a tool or the like in order to apply a rotational force to the bolt 1. As one example, a common tool for rotating a bolt, such as a common wrench, can be used to hold the head portion 4. In the example shown in Figure 2 , the head portion 4 has a substantially hexagonal prism shape extending in the axial direction DA. Therefore, the head portion 4 can be held by a hexagonal socket of a common socket wrench. Therefore, by using a socket wrench having a hexagonal socket, the head portion 4 is held by the hexagonal socket and the socket wrench is operated, the bolt 1 can be rotated.

[0071] In the example shown in Figures 1 to 5 , the surface of the head portion 4 is connected to the first face 2a of the flange portion 2. Although not shown, in the case where the bolt 1 is viewed from the head portion 4 side, the outer shape of the head portion 4 and the outer shape of the flange portion 2 can be identical, and the outer surface of the head portion 4 can be connected to the third face 2c of the flange portion 2. In this case, the flange portion 2 does not have the first face 2a. For example, the head portion 4 and the flange portion 2 can be integrated and form a substantially cylindrical shape or a substantially prismatic shape as a whole.

[0072] Next, the centering portion 5 will be described. The centering portion 5 is provided between the flange portion 2 and the threaded portion 3 and is inserted into the second hole 81 of the second member 8. As shown inFigures 3 to 5 As shown, at least a part of the centering portion 5 is positioned within the second hole 81 of the second member 8 in a state where the first member 7 and the second member 8 are joined by the bolt 1. The centering portion 5 is provided between the flange portion 2 and the threaded portion 3, and links the flange portion 2 and the threaded portion 3 as described above. In Figures 1 to 5 In the example shown, the centering portion 5 is connected to the second face 2b of the flange portion 2.

[0073] The centering portion 5 has a centering portion body 52 and a plurality of, for example, three or more to six or less, vane portions 51 provided at an outer periphery of the centering portion body 52 and arranged equidistantly or approximately equidistantly in the circumferential direction DB at a prescribed interval. It is appropriate for the vane portions 51 to be arranged equidistantly, but they can also be arranged approximately equidistantly within a tolerance range of ±5°. Figure 7 is a partial cross-sectional view of the centering portion 5 in a cross section of the bolt 1 taken along the line VIIA-VIIA of Figure 6 is a partial cross-sectional view of the centering portion 5 in a cross section of the bolt 1 taken along the line VIIA-VIIA of Figure 7 is a cross-sectional view corresponding to a cross section of the bolt 1 taken through the axis LA. In addition, Figure 7 is a cross-sectional view corresponding to a cross section of the bolt 1 taken through the axis LA. In addition, Figure 3 is a view in which the cross section of the bolt 1 in the range enclosed by the dotted line marked VIIB in Figure 7 The dotted lines shown are lines that simply show the boundary between the centering portion body 52 and the vane portions 51, and the boundary between the flange portion 2 and the centering portion 5.

[0074] Figure 1 and Figure 7 The centering portion body 52 shown has a cylindrical shape that is rotationally symmetrical about the axis LA. As one example, the centering portion body 52 and the threaded portion body 32 are integral, and form a substantially cylindrical shape as a whole.

[0075] The plurality of vane portions 51 are arranged along the circumferential direction DB on a side face of the centering portion body 52 having a cylindrical shape.

[0076] Each vane portion 51 provided at an outer periphery of the centering portion body 52 has an outer diameter increasing portion 53 in which the distance w6 from the axis LA to the outer edge gradually increases in a direction toward the side opposite to the tightening rotation direction SB1 of the bolt 1 (in the loosening rotation direction SB2), and gradually increases in the axial direction DA toward the flange portion 2 (in the retreat direction SA2). Also, as shown in Figure 7 The distance w6 corresponds to the distance between the outer edge of the outer diameter increasing portion 53 in the radial direction DC and the axis LA, as shown in

[0077] In addition, in Figure 1 , Figure 6 and Figure 7In the present embodiment, the blade portion 51 is constituted by a protrusion that protrudes in the radial direction DC. The blade portion 51 constituted by the protrusion has an outer diameter increasing surface 531 that corresponds to the outer edge of the outer diameter increasing portion 53, and an outer diameter decreasing surface 541 that corresponds to the outer edge of the connecting portion 54 as described later. The outer diameter increasing surface 531 is provided at a position closer to the fastening rotation direction SB1 side than the outer diameter decreasing surface 541.

[0078] As shown in FIG. 6, the outer diameter increasing surface 531 is provided at a portion of the region Al in which one blade portion 51 is provided in the circumferential direction DB. Also, the blade portion 51 has the outer diameter increasing portion 53 having the outer diameter increasing surface 531, and the connecting portion 54 having the outer diameter decreasing surface 541, wherein the outer diameter increasing portion 53 is provided at a region A2 that forms a portion of the region Al. In addition, the connecting portion 54 is provided at a region A3 that is outside the region A2 in the region Al. Figure 6

[0079] As shown in FIG. 6, the outer diameter increasing surface 531 is inclined with respect to the circumferential direction DB such that the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the loosening rotation direction SB2. Thus, the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the loosening rotation direction SB2, in other words, toward the direction of the side opposite to the fastening rotation direction SB1 of the bolt 1. In addition, the outer diameter increasing surface 531 is inclined with respect to the axial direction DA such that the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the retreat direction SA2. In this way, the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the retreat direction SA2, in other words, along the axial direction DA toward the flange portion 2. Figure 1 Figure 7 As shown in FIG. 6, the outer diameter increasing surface 531 is inclined with respect to the circumferential direction DB such that the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the loosening rotation direction SB2. Thus, the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the loosening rotation direction SB2, in other words, toward the direction of the side opposite to the fastening rotation direction SB1 of the bolt 1. In addition, the outer diameter increasing surface 531 is inclined with respect to the axial direction DA such that the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the retreat direction SA2. In this way, the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases toward the retreat direction SA2, in other words, along the axial direction DA toward the flange portion 2.

[0080] The connecting portion 54 is a portion that connects the centering portion body 52 and the outer diameter increasing portion 53 in the blade portion 51. The shape of the connecting portion 54 is not particularly limited as long as it does not significantly interfere with the function of the outer diameter increasing portion 53 as described later. The connecting portion 54 is preferably not in contact with the inner wall of the second hole 81 when the centering portion 5 is inserted into the second hole 81 of the second member 8 and the bolt 1 is rotated in the fastening rotation direction SB1. The outer diameter decreasing surface 541 is inclined with respect to the circumferential direction DB such that the distance w7 from the axis LA to the outer edge of the connecting portion 54 gradually decreases toward the loosening rotation direction SB2. In addition, the outer diameter decreasing surface 541 is inclined with respect to the axial direction DA such that the distance w7 from the axis LA to the outer edge of the connecting portion 54 gradually increases toward the retreat direction SA2. As shown in FIG. 6, the distance w7 corresponds to the distance in the radial direction DC between the outer edge of the connecting portion 54 and the axis LA. Figure 7

[0081] ​​​The "gradual increase" of the distance w6 and the distance w7 means that the distance w6 and the distance w7 increase without changing to decrease. The expression that the distance w6 and the distance w7 "gradually increase" does not exclude the presence of a region in which the distance w6 and the distance w7 are constant (a region in which the distance w6 and the distance w7 do not change). That is, the manner in which the distance w6 and the distance w7 "gradually increase" includes a manner in which there are a first increase region and a second increase region in which the distance w6 and the distance w7 increase, and a constant region between the first increase region and the second increase region in which the distance w6 and the distance w7 are constant. In addition, the "gradual decrease" of the distance w6 and the distance w7 means that the distance w6 and the distance w7 decrease without changing to increase. The expression that the distance w6 and the distance w7 "gradually decrease" does not exclude the presence of a region in which the distance w6 and the distance w7 are constant (a region in which the distance w6 and the distance w7 do not change). That is, the manner in which the distance w6 and the distance w7 "gradually decrease" includes a manner in which there are a first decrease region and a second decrease region in which the distance w6 and the distance w7 decrease, and a constant region between the first decrease region and the second decrease region in which the distance w6 and the distance w7 are constant.

[0082] In Figure 1 In the example shown, the outer diameter increasing surface 531 of the outer diameter increasing portion 53 is connected to the second surface 2b of the flange portion 2 and the side surface of the centering portion body 52. In addition, the outer diameter decreasing surface 541 of the connecting portion 54 is connected to the second surface 2b of the flange portion 2 and the side surface of the centering portion body 52. In addition, the outer diameter increasing surface 531 and the outer diameter decreasing surface 541 are connected at the ridge line 55 of the blade portion 51 composed of the protrusions.

[0083] The outer diameter increasing portion 53 has a first inclined surface 532 and a second inclined surface 533.

[0084] As Figure 1As shown, the outer diameter increasing surface 531 of the outer diameter increasing portion 53 has a first inclined surface 532 inclined with respect to the axis LA and a second inclined surface 533 located on the threaded portion 3 side in the axis direction DA as compared with the first inclined surface 532. The second inclined surface 533 is located on the entry direction SA1 side as compared with the first inclined surface 532, in other words, on the threaded portion 3 side in the axis direction DA as compared with the first inclined surface 532. The angle at which the first inclined surface 532 is inclined with respect to the axis LA and the angle at which the second inclined surface 533 is inclined with respect to the axis LA are different. That is, in the cross section of the bolt 1 passing through the axis LA, the first inclined surface 532 is inclined at a first angle θ1 with respect to the axis LA, and the second inclined surface 533 is inclined at a second angle θ2 with respect to the axis LA.

[0085] As described above, Figure 7 A cross-sectional view corresponding to the cross section of the bolt 1 passing through the axis LA is shown.

[0086] As Figure 7 shown, the second angle θ2 of the second inclined surface 533 is larger than the first angle θ1 of the first inclined surface 532. To be more specific, in the cross section of the bolt 1, the angle at which the second inclined surface 533 is inclined with respect to the axis LA, that is, the second angle θ2, is larger than the angle at which the first inclined surface 532 is inclined with respect to the axis LA, that is, the first angle θ1.

[0087] As one example, the first inclined surface 532 is a smooth curved surface. The first inclined surface 532 and the second inclined surface 533 are each inclined with respect to the circumferential direction DB so as to gradually increase the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 toward the loosening rotation direction SB2. In addition, the first inclined surface 532 and the second inclined surface 533 are each inclined with respect to the axis direction DA so as to gradually increase the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 toward the retreat direction SA2.

[0088] Figure 8 is a side view showing the shape of the periphery of the centering portion 5 of the bolt 1 as viewed from the radial direction DC. As Figure 1 and Figure 8 shown, the first inclined surface 532 and the second inclined surface 533 are connected at an inclined surface ridge line 534. Also, as Figure 1 and Figure 8 shown, the inclined surface ridge line 534 is inclined so as to be away from the flange portion 2 as toward the tightening rotation direction SB1. In Figure 8 the example shown, the inclined surface ridge line 534 is inclined with respect to the axis direction DA so as to be away from the flange portion 2 as toward the tightening rotation direction SB1. In addition, the inclined surface ridge line 534 is inclined with respect to the circumferential direction DB so as to be close to the axis LA as toward the tightening rotation direction SB1.

[0089] InFigure 1 Figure 7 Figure 8 In the example shown in Figs. 32, 33, and 34, the first inclined surface 532 is connected to the second surface 2b of the flange portion 2. In the example shown in Figs. 35, 36, and 37, the second inclined surface 533 is connected to the side surface of the centering portion body 52. Figure 1 Figure 7 Figure 8 In the example shown in Figs. 35, 36, and 37, the second inclined surface 533 is connected to the side surface of the centering portion body 52.

[0090] As one example, the centering portion 5 has three or more and six or less blade portions 51. In the example shown in Figs. 32, 33, and 34, the centering portion 5 has three blade portions 51. As one example, the plurality of blade portions 51 have the same shape. In the example shown in Figs. 35, 36, and 37, the plurality of blade portions 51 have different shapes. Figure 1 Figure 6 In the example shown in Figs. 35, 36, and 37, the plurality of blade portions 51 have different shapes. Figure 6

[0091] (Action)

[0092] Next, the action of the bolt 1 configured by such a structure will be described. In particular, the action of the bolt 1 when the first member 7 and the second member 8 having a plate-like shape are joined by the bolt 1 will be described. First, the first member 7 having the first hole 71 and the second member 8 having the second hole 81 are prepared. Figure 3 Next, as shown in Fig. 30, the first member 7 and the second member 8 are arranged in superposition in a manner that the first hole 71 and the second hole 81 are opposed to each other. In the example shown in Fig. 31, the first member 7 and the second member 8 having a plate-like shape are arranged so as not to be parallel to the horizontal plane G. In particular, the first member 7 and the second member 8 are arranged so as to be perpendicular to the horizontal plane G. In the example shown in Fig. 32, the first member 7 is supported by the horizontal plane G, and the second member 8 is away from the horizontal plane G.

[0093] Figure 9 Next, as shown in Fig. 30, the first member 7 and the second member 8 are arranged in superposition in a manner that the first hole 71 and the second hole 81 are opposed to each other. In the example shown in Fig. 31, the first member 7 and the second member 8 having a plate-like shape are arranged so as not to be parallel to the horizontal plane G. In particular, the first member 7 and the second member 8 are arranged so as to be perpendicular to the horizontal plane G. In the example shown in Fig. 32, the first member 7 is supported by the horizontal plane G, and the second member 8 is away from the horizontal plane G. Figure 9 Figure 9

[0094] Next, after passing the threaded portion 3 of the bolt 1 from the leading end on the entering direction SA1 side through the second hole 81, the external thread 31 of the threaded portion 3 is partially engaged with the internal thread 72 provided in the first hole 71. For example, after holding and fixing the first member 7 and the second member 8, the leading end on the entering direction SA1 side of the threaded portion 3 of the bolt 1 is made to approach the first hole 71, and the bolt 1 is rotated in the fastening rotation direction SB1, whereby the external thread 31 can be partially engaged with the internal thread 72. The operation of partially engaging the external thread 31 of the threaded portion 3 with the internal thread 72 provided in the first hole 71 is performed, for example, manually by the user of the bolt 1.

[0095] ​​​​​​​​​Next, the bolt 1 is further rotated in the fastening rotation direction SB1. By this, the bolt 1 is fastened to the first member 7, and the bolt 1 enters in the entering direction SA1 relative to the first member 7. In the case where the bolt 1 is further rotated in the fastening rotation direction SB1, the bolt 1 can be rotated, for example, using a tool capable of holding the head 4 of the bolt 1. In the case where the bolt 1 has the head 4 of the approximate hexagonal prism shape as shown, a socket wrench having a hexagonal socket can be used as the tool to rotate the bolt 1. Figure 2

[0096] In the case where the bolt 1 is rotated in the fastening rotation direction SB1, first, the first member 7 contacts the second member 8, and then the flange portion 2 of the bolt 1 contacts the second member 8 at the second face 2b position. By this, as shown in Figure 3 , the second member 8 is clamped between the flange portion 2 of the bolt 1 and the first member 7, so that the position of the second member 8 relative to the first member 7 is fixed. By this, the first member 7 and the second member 8 are joined by the bolt 1.

[0097] By rotating the bolt 1 in the fastening rotation direction SB1 and making the bolt 1 enter in the entering direction SA1 relative to the first member 7, the position of the second member 8 relative to the first member 7 can be corrected by the action of the centering portion 5. In particular, in the case where the first member 7 and the second member 8 are orthogonal to the horizontal plane G as shown, and the second member 8 is apart from the horizontal plane G, the second member 8 is likely to deviate downward due to the action of gravity. In this case, too, the position of the second member 8 relative to the first member 7 can be corrected by the action of the centering portion 5. Figure 9

[0098] The action of the centering portion 5 of the bolt 1 will be described below. By rotating the bolt 1 in the fastening rotation direction SB1 and making the bolt 1 enter in the entering direction SA1 relative to the first member 7, the centering portion 5 enters the second hole 81 of the second member 8. After the centering portion 5 enters the second hole 81, the outer diameter increasing portion 53 of the blade portion 51 contacts the inner wall of the second hole 81. In particular, after the centering portion 5 sufficiently enters the second hole 81, the outer diameter increasing portion 53 of each of the plurality of blade portions 51 contacts the inner wall of the second hole 81 at the outer diameter increasing face 531. As one example, the outer diameter increasing portion 53 of each of the plurality of blade portions 51 contacts the inner wall of the second hole 81 at the first inclined face 532.

[0099] When the centering portion 5 enters the second hole 81 from the front end on the entering direction SA1 side until the position of the X-X line of Figure 7 , the outer diameter increasing portion 53 of each of the plurality of blade portions 51 contacts the inner wall of the second hole 81 at the outer diameter increasing face 531. By further rotating the bolt 1 in the fastening rotation direction SB1, the centering portion 5 further enters the second hole 81 until the position of the Y-Y line of Figure 7 ​​the position of the XI-XI line of FIG. 1.

[0100] The function of the centering portion 5 of the bolt 1 at this time is further explained using the drawings. Here, Figure 10 is a cross-sectional view showing the shape of the portion on the side where the flange portion 2 of the bolt 1 is located, taken along the X-X line of FIG. 1, as viewed from the threaded portion 3 side. Figure 7 is a cross-sectional view showing the shape of the portion on the side where the flange portion 2 of the bolt 1 is located, taken along the XI-XI line of FIG. 1, as viewed from the threaded portion 3 side. Figure 11 is a cross-sectional view showing the shape of the portion on the side where the flange portion 2 of the bolt 1 is located, taken along the XI-XI line of FIG. 1, as viewed from the threaded portion 3 side. Figure 7 Figure 10 Figure 11 In FIGS. 1, 2, 3, and 4, only the periphery of the centering portion 5 in the bolt 1 is shown.

[0101] Figure 10 The dotted line shown in FIG. 1 is a circumscribed circle Cl of the outline of the cross section of the centering portion 5 in FIG. 2, which shows the cross section of the centering portion 5 at the X-X line of FIG. 1. Figure 7 The dotted line shown in FIG. 3 is a circumscribed circle C2 of the outline of the cross section of the centering portion 5 in FIG. 4, which shows the cross section of the centering portion 5 at the XI-XI line of FIG. 1. In the example shown in FIGS. 1 to 4, the circumscribed circle Cl and the circumscribed circle C2 are in contact with each outer diameter increasing portion 53 of the plurality of blade portions 51. In particular, the circumscribed circle Cl and the circumscribed circle C2 are in contact with each outer diameter increasing portion 53 at the first inclined surface 532. Figure 10 Figure 11 As shown in FIG. 1, the distance w6 from the axis line LA to the outer edge of the outer diameter increasing portion 53 gradually increases along the axis direction DA toward the flange portion 2. Therefore, Figure 7 Figure 11 The radius w3 of the circumscribed circle C2 of the outline of the cross section of the centering portion 5 shown in FIG. 3 is larger than the radius w2 of the circumscribed circle Cl of the outline of the cross section of the centering portion 5 shown in FIG. 2. Therefore, by further advancing the entry of the centering portion 5 into the second hole 81 from the state where each outer diameter increasing portion 53 of the plurality of blade portions 51 is in contact with the inner wall of the second hole 81 at the outer diameter increasing surface 531, the following effects can be obtained. That is, the portion of the centering portion 5 where the outer diameter is larger enters the second hole 81, and the centering portion 5 is more firmly in close contact with the second hole 81, so that the position of the second member 8 relative to the centering portion 5 can be corrected. Since the bolt 1 is fastened to the first member 7 and the position of the second member 8 relative to the centering portion 5 is corrected, the position of the second member 8 relative to the first member 7 can be corrected. Figure 10 Figure 11

[0102] Figure 7 Figure 11 Figure 10

[0103] ​​​​​​​​​​Further, the distance w6 from the axis line LA to the outer edge of the outer diameter increasing portion 53 gradually increases in the direction toward the side opposite to the fastening rotation direction SB1 of the bolt 1. In the present embodiment, since the distance w6 from the axis line LA to the outer edge of the outer diameter increasing portion 53 gradually increases, the following effects can be obtained. Hereinafter, the effects of the present embodiment will be described by comparison with a comparative example. As the comparative example, a bolt 100 having the same shape as the bolt 1 of the present embodiment is used except that the centering portion 5 is not provided and a circular truncated cone shaped portion 105 is provided in place of the centering portion 5. Figure 12 is a side view showing the shape of the bolt 100 of the comparative example as viewed from the radial direction DC. Figure 12 The broken line shown is a line simply showing the boundary of the flange portion 102, the threaded portion 103, the head portion 104, and the circular truncated cone shaped portion 105 in the bolt 100 of the comparative example. As shown in Figure 12 As shown, the circular truncated cone shaped portion 105 of the bolt 100 of the comparative example has a side surface 105a inclined in such a manner that the outer diameter of the circular truncated cone shaped portion 105 gradually increases in the retreat direction SA2.

[0104] In the bolt 100 of the comparative example, the bolt 100 is rotated in the fastening rotation direction SB1 and, as the bolt 100 is made to enter the second member 8 in the entering direction SA1, the circular truncated cone shaped portion 105 enters the second hole 81 of the second member 8. By making the circular truncated cone shaped portion 105 enter the second hole 81, the side surface 105a of the circular truncated cone shaped portion 105 is pressed against the inner wall of the second hole 81 from the axis line direction DA. Thereby, the position of the second member 8 with respect to the circular truncated cone shaped portion 105 is corrected. In the bolt 100 of the comparative example, since the bolt 100 is fastened to the first member 7 and the position of the second member 8 with respect to the circular truncated cone shaped portion 105 is corrected, the position of the second member 8 with respect to the first member 7 is corrected.

[0105] However, in the bolt 100 of the comparative example, since the side surface 105a is pressed against the inner wall of the second hole 81 from the axis line direction DA, there is a risk that the inner wall of the second hole 81 and the side surface 105a are deformed. In order to suppress the deformation of the inner wall of the second hole 81 and the side surface 105a, it is also conceivable to form an inclination corresponding to the inclination of the side surface 105a in the inner wall of the second hole 81 so that the force applied to the inner wall of the second hole 81 and the side surface 105a is reduced when the side surface 105a is pressed against the inner wall of the second hole 81. However, in this case, performing the processing of forming the inclination in the inner wall of the second hole 81 would correspondingly result in an increase in the number of manufacturing processes of the second member 8. Further, if the thickness of the second member 8 is small, it is difficult to form the inclination in the inner wall of the second hole 81. Therefore, the second member 8 that can be engaged with the first member 7 using the bolt 100 of the comparative example is limited to a member having a thickness of a certain size or more.

[0106] In the bolt 1 of this embodiment, the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases along the axial direction DA toward the flange portion 2. Furthermore, the distance w6 from the axis LA to the outer edge of the outer diameter increasing portion 53 gradually increases in the direction opposite to the tightening rotation direction SB1 of the bolt 1. Therefore, after the bolt 1 is rotated along the tightening rotation direction SB1, the outer diameter increasing portion 53 contacts the inner wall of the second hole 81. Since the outer diameter increasing portion 53 contacts the inner wall of the second hole 81, the position of the second component 8 relative to the centering portion 5 can be corrected by a cam action that transmits the rotational force of the bolt 1 from the outer diameter increasing portion 53 to the inner wall side of the second hole 81 as a force toward the radial direction DC.

[0107] Specifically, with each of the multiple outer diameter increase portions 53 of the multiple blade portions 51 in contact with the inner wall of the second hole 81, by rotating the bolt 1 in the tightening rotation direction SB1, the rotational force of the bolt 1 can be transmitted from each of the multiple outer diameter increase portions 53 to multiple points on the inner wall of the second hole 81. Thus, the rotational force of the bolt 1 can be used particularly efficiently to correct the position of the second component 8 relative to the centering portion 5.

[0108] According to the bolt 1 of the present disclosure, the position of the second component 8 relative to the centering portion 5 can be corrected by using the force of pressing the centering portion 5 against the inner wall of the second hole 81 from the axial direction DA and by using the rotational force of the bolt 1. Therefore, even if the force of pressing the centering portion 5 against the inner wall of the second hole 81 from the axial direction DA is not greater than the force of pressing the side surface 105a of the frustum-shaped portion 105 in the comparative example bolt 100 against the inner wall of the second hole 81 from the axial direction DA, the position of the second component 8 relative to the centering portion 5 can still be corrected. Thus, in the bolt 1 of the present disclosure, the force of pressing the centering portion 5 against the inner wall of the second hole 81 from the axial direction DA is reduced, thereby suppressing the deformation of the inner wall of the second hole 81 and the centering portion 5. In addition, in the bolt 1 of the present disclosure, it is not necessary to form an inclination in the inner wall of the second hole 81. Therefore, it is possible to suppress the increase in the number of manufacturing steps of the second component 8. Furthermore, as the second component 8, a component with a relatively small thickness that is difficult to form an inclination on the inner wall of the second hole 81 can be used.

[0109] In particular, in such Figure 9 When the first component 7 and the second component 8 are configured to be non-parallel to the horizontal plane G, and the second component 8 is prone to deviating downward due to gravity, the downward deviation of the second component 8 can be corrected by using the rotational force of the bolt 1.

[0110] Furthermore, in the bolt 1 of the present disclosure, the position of the second component 8 relative to the centering portion 5 can be corrected by utilizing the force of pressing the centering portion 5 against the inner wall of the second hole 81 from the axial direction DA and by utilizing the rotational force of the bolt 1. Therefore, Figure 8 The width w4 of the blade portion 51 shown in the axial direction DA is... Figure 12 The comparative example bolt 100 has a smaller width w5 in the axial direction DA of its frustum-shaped portion 105, while still achieving the effect of the centering portion 5 in correcting the position of the second component 8 relative to the centering portion 5. Therefore, even when using a component with a smaller thickness, the effect of the centering portion 5 in correcting the position of the second component 8 relative to the centering portion 5 can be sufficiently obtained for the second component 8. The width w4 of the blade portion 51 in the axial direction DA is, for example, 0.7 mm or less. Furthermore, even when… Figure 3 When the thickness w8 of the second component 8 shown is small, the width w4 of the blade portion 51 in the axial direction DA can be set to be less than or equal to the thickness w8 of the second component 8. As an example, the width w4 of the blade portion 51 in the axial direction DA is more than 0.8 times and less than 1 times the thickness w8 of the second component 8. It should be noted that the width w4 of the blade portion 51 in the axial direction DA can also be greater than the thickness w8 of the second component 8.

[0111] in addition, Figure 6 The maximum distance w9 from the axis LA to the outer edge of the blade portion 51 shown is preferably... Figure 3 The radius w10 of the second hole 81 of the second component 8 shown is more than 0.95 times and less than 1 times. Since the distance w9 is more than 0.95 times and less than 1 times the radius w10, the blade portion 51 can be produced more efficiently to correct the position of the second component 8 relative to the centering portion 5.

[0112] Furthermore, in the bolt 1 of the embodiment of this disclosure, the outer diameter increasing portion 53 has a first inclined surface 532 and a second inclined surface 533 located on the threaded portion 3 side in the axial direction DA compared to the first inclined surface 532. In a cross-section of the bolt 1 through the axis LA, the first inclined surface 532 is inclined at a first angle θ1 relative to the axis LA. Furthermore, in a cross-section of the bolt 1 through the axis LA, the second inclined surface 533 is inclined at a second angle θ2 relative to the axis LA. Moreover, the second angle θ2 is greater than the first angle θ1. Therefore, the following effects can be obtained.

[0113] First, when the bolt 1 is inserted into the first hole 71 of the first component 7 and the second hole 81 of the second component 8, the centering part 5 of the bolt 1 is initially inserted into the second hole 81 of the second component 8 at the second inclined surface 533. In this case, the second angle θ2 of the inclination of the second inclined surface 533 is set to be greater than the first angle θ1 of the inclination of the first inclined surface 532. Therefore, it is easy to make... Figure 6 As shown, when viewing the bolt 1 from the threaded portion 3 side, the area of ​​the second inclined surface 533 is larger than the area of ​​the first inclined surface 532. Therefore, since the second angle θ2 is greater than the first angle θ1, the following effect can be obtained. First, consider the following situation: when the position of the second component 8 relative to the first component 7 is significantly deviated, and the threaded portion 3 of the bolt 1 is pushed through the second hole 81 to tighten the bolt 1 relative to the first component 7. If the bolt 1 is rotated in the tightening rotation direction SB1 to tighten the bolt 1 relative to the first component 7, the centering portion 5 of the bolt 1 approaches the second hole 81 of the second component 8 in the entry direction SA1. In this case, if the position of the second component 8 is significantly deviated from the first component 7, the inner wall of the second hole 81 can be prevented from contacting the first inclined surface 532 simply by bringing the centering portion 5 close to the second hole 81 in the entry direction SA1. According to this embodiment, the blade portion 51 has a second inclined surface 533, and since the second angle θ2 is greater than the first angle θ1, the inner wall of the second hole 81 easily contacts the second inclined surface 533. Furthermore, after the inner wall of the second hole 81 comes into contact with at least a portion of the second inclined surface 533, by further tightening the bolt 1 relative to the first component 7, the inner wall of the second hole 81 can slide along the second inclined surface 533 and come into contact with the first inclined surface 532.

[0114] Next, the centering portion 5 of bolt 1 contacts the inner wall of the second hole 81 of the second component 8 at the first inclined surface 532. At this time, the first angle θ1 of the first inclined surface 532 is set to be smaller than the second angle θ2 of the second inclined surface 533. The smaller the first angle θ1, the larger the distance between the first inclined surface 532 and the axis LA in the radial direction DC at the position away from the flange portion 2. Thus, even at the position away from the flange portion 2, the first inclined surface 532 can easily contact the inner wall of the second hole 81. With each outer diameter increase portion 53 of the plurality of blade portions 51 in contact with the inner wall of the second hole 81 at the first inclined surface 532, by rotating bolt 1 in the tightening rotation direction SB1, the rotational force of bolt 1 can be transmitted from each outer diameter increase portion 53 to the inner wall of the second hole 81. Thus, the rotational force of bolt 1 can be used efficiently to correct the position of the second component 8 relative to the centering portion 5.

[0115] Further, in the bolt 1 of the embodiment of the present disclosure, the inclined edge 534 formed by the first inclined surface 532 and the second inclined surface 533 being connected is inclined in such a manner as to be away from the flange portion 2 as it goes toward the fastening rotation direction SB1. Therefore, on the side of the outer diameter increasing surface 531 closer to the advance direction SA1, the proportion of the first inclined surface 532 is smaller and the proportion of the second inclined surface 533 is larger with respect to the entire outer diameter increasing surface 531. Further, on the side of the outer diameter increasing surface 531 closer to the retreat direction SA2, the proportion of the first inclined surface 532 is larger and the proportion of the second inclined surface 533 is smaller with respect to the entire outer diameter increasing surface 531. Therefore, on the side of the centering portion 5 closer to the advance direction SA1, the inner wall of the second hole 81 more easily comes into contact with the second inclined surface 533. Thereby, on the side of the centering portion 5 closer to the advance direction SA1, it is more easily obtained the effect exerted by the outer diameter increasing surface 531, particularly the second inclined surface 533. That is, on the side of the centering portion 5 closer to the advance direction SA1, it is more easily made the inner wall of the second hole 81 slide along the second inclined surface 533 in the case where the position of the second member 8 largely deviates, and come into contact with the first inclined surface 532. On the other hand, on the side of the centering portion 5 closer to the retreat direction SA2, the inner wall of the second hole 81 more easily comes into contact with the first inclined surface 532. Thereby, on the side of the centering portion 5 closer to the retreat direction SA2, it is more easily obtained the effect exerted by the outer diameter increasing surface 531, particularly the first inclined surface 532. That is, it is made each of the outer diameter increasing portions 53 of the plurality of blade portions 51 come into contact with the inner wall of the second hole 81 on the first inclined surface 532, and it is possible to efficiently utilize the rotation force of the bolt 1 to correct the position of the second member 8 with respect to the centering portion 5.

[0116] Further, in the bolt 1 of the embodiment of the present disclosure, as described above, the centering portion 5 has 3 or more and 6 or less blade portions 51.

[0117] Since the number of the blade portions 51 that the centering portion 5 has is 3 or more, when the bolt 1 is rotated in the fastening rotation direction SB1 and the centering portion 5 is made to advance into the second hole 81, it is possible to make the inner wall of the second hole 81 come into contact with the blade portions 51 at 3 or more places. Thereby, when the bolt 1 is further rotated in the fastening rotation direction SB1, it is possible to maintain the state where the inner wall of the second hole 81 is supported by the centering portion 5 having the blade portions 51 at 3 or more places, and thereby it is possible to stably correct the position of the second member 8 with respect to the centering portion 5.

[0118] On the other hand, since the number of the blade portions 51 of the centering portion 5 is six or less, the following effects can be obtained. The length of each of the blade portions 51 in the circumferential direction DB can be increased. In particular, the length of each of the outer diameter increasing portions 53 in the circumferential direction DB can be increased. Thus, the effect of the blade portions 51 on correcting the position of the second member 8 with respect to the centering portion 5 can be more efficiently produced. In addition, due to deformation of the shape of the bolt 1, the second hole 81 of the second member 8, or the like, the blade portions 51 that do not contact the inner wall of the second hole 81 can be generated when the centering portion 5 is made to enter the second hole 81. By setting the number of the blade portions 51 to six or less, the number of the blade portions 51 that do not contact the inner wall of the second hole 81 can be suppressed from increasing, and the effect of the centering portion 5 on correcting the position of the second member 8 with respect to the centering portion 5 can be more efficiently produced.

[0119] Note that various modifications can be applied to the embodiment described above. One example of a modification will be described below with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals are used for portions that can be similarly constituted as in the above-described specific example, and repetitive description will be omitted.

[0120] (Modified Example)

[0121] In the embodiment described above, an example in which the two members, the first member 7 and the second member 8, are joined by the bolt 1 has been described. However, the object to be joined by the bolt 1 is not limited to this. Three or more members including the first member 7 and the second member 8 can be joined by the bolt 1.

[0122] Figure 13 is a cross-sectional view showing one example of a state in which three or more members including the first member 7 and the second member 8 are joined by the bolt 1 of the modified example. Figure 13 The broken line shown is a line that simply shows the boundary of the flange portion 2, the threaded portion 3, the head portion 4, and the centering portion 5. In the example shown, the first member 7 and the second member 8 are joined by the bolt 1. Figure 13 In the example shown, the first member 7 and the second member 8 are joined by the bolt 1 together with the third member 9.

[0123] Among the plurality of members joined by the bolt 1, the third member 9 other than the first member 7 and the second member 8 has a third hole 91 into which a portion of the bolt 1 is inserted. The third hole 91 of the third member 9 is into which at least one of the threaded portion 3 and the centering portion 5 of the bolt 1 is inserted. In the example shown, the third member 9 has the same configuration as the above-described second member 8, unless there is a conflict. Figure 13

[0124] ​Three or more components including the first component 7 and the second component 8 can be joined by the bolt 1 according to the following method. First, the first component 7 and the second component 8 are overlapped in such a manner that the first hole 71, the second hole 81, and the third hole 91 of the third component 9 are aligned, and the third component 9 is sandwiched between the first component 7 and the second component 8. Next, the threaded portion 3 of the bolt 1 is passed through the second hole 81 and the third hole 91 of the third component 9 from the front end on the entering direction SA1 side. Next, the bolt 1 is rotated in the fastening rotation direction SB1, the external thread 31 of the threaded portion 3 is engaged with the internal thread 72 provided in the first hole 71, and the bolt 1 is fastened to the first component 7. By the above method, three or more components including the first component 7 and the second component 8 can be joined by the bolt 1. In Figure 13 In the example shown, the third component 9 is sandwiched between the first component 7 and the second component 8, and the first hole 71, the second hole 81, and the third hole 91 are aligned. In addition, the threaded portion 3 of the bolt 1 is passed through the second hole 81 and the third hole 91, and the bolt 1 is fastened to the first component 7.

[0125] In the above modification example, the centering portion 5 can also be inserted into the third hole 91 of the third component 9 at the same time as being inserted into the second hole 81. In particular, the outer diameter increasing portion 53 of the blade portion 51 in the centering portion 5 can be positioned inside the third hole 91 of the third component 9. By this, the outer diameter increasing portion 53 of the blade portion 51 can be brought into contact with the wall surface of the third hole 91 of the third component 9. Therefore, for the third component 9, the position of the third component 9 with respect to the centering portion 5 can be corrected by the effect of the centering portion 5, and thus the position of the third component 9 with respect to the first component 7 can be corrected.

[0126] In Figure 13 In the example shown, a part of the centering portion 5 is inserted into the third hole 91 of the third component 9. In particular, the outer diameter increasing portion 53 of the blade portion 51 in the centering portion 5 is positioned inside the third hole 91. In this case, the outer diameter increasing portion 53 of the blade portion 51 is brought into contact with the wall surface of the third hole 91 of the third component 9, and thus the position of the third component 9 with respect to the centering portion 5 is corrected by the effect of the centering portion 5. In the above modification example, an example in which the third component 9 as a component other than the first component 7 and the second component 8 is interposed between the first component 7 and the second component 8 is shown, but it is not limited thereto, and the third component 9 and a fourth component as components other than the first component 7 and the second component 8 can be provided, and the third component 9 and the fourth component can be interposed between the first component 7 and the second component 8.

[0127] The plurality of structural elements disclosed in the above embodiment and modification examples can be appropriately combined as needed. Alternatively, several structural elements can be deleted from all the structural elements shown in the above embodiment and modification examples.

Claims

1. A bolt having an axis, said bolt being installed to a first hole of a first member having the first hole and a second hole of a second member having the second hole in order to join the first member and the second member, wherein, The bolt includes: a flange portion that abuts the second member; a threaded portion that is joined to the flange portion and is inserted into the first hole of the first member; a head portion that is provided on a side of the flange portion opposite the threaded portion; and a centering portion that is provided between the flange portion and the threaded portion and is inserted into the second hole of the second member; the centering portion has a centering portion body and a plurality of blade portions that are provided on an outer periphery of the centering portion body and extend in a circumferential direction, each blade portion has an outer diameter increasing portion in which a distance from the axis to an outer edge gradually increases toward a direction of a side opposite a tightening rotation direction of the bolt and a distance from the axis to the outer edge gradually increases in an axial direction toward the flange portion, the outer diameter increasing portion has a first inclined surface and a second inclined surface that is located on the threaded portion side of the axial direction compared to the first inclined surface, the first inclined surface and the second inclined surface are connected at an inclined surface ridge line, the inclined surface ridge line is inclined in such a way as to move away from the flange portion toward the tightening rotation direction.

2. The bolt according to claim 1, wherein, in a cross section of the bolt that passes through the axis, the first inclined surface has a first angle (θ1) that is inclined with respect to the axis and the second inclined surface has a second angle (θ2) that is inclined with respect to the axis, the second angle (θ2) is greater than the first angle (θ1).

3. The bolt according to claim 1 or 2, wherein, the centering portion has 3 or more and 6 or less of the blade portions.

4. The bolt according to claim 1 or 2, wherein, a width of the blade portion in the axial direction is 0.7 mm or less.

5. The bolt according to claim 1 or 2, wherein, a width of the blade portion in the axial direction is 0.8 times or more and 1 times or less of a thickness of the second member.

6. The bolt according to claim 1 or 2, wherein, a maximum distance from the axis to an outer edge of the blade portion is 0.95 times or more and 1 times or less of a radius of the second hole.

Images