Spacing member and fastening member

Abstract

The present invention provides a spacing member and a fastening member that suppress the detachment of color bolts. [Solution] The spacing member 20a comprises a collar bolt 21, a multi-purpose member 22, and an adjuster nut 23. The collar bolt 21 has a male thread 21f on its outer surface that is in the opposite direction to the fastening bolt 10. The multi-purpose member 22 engages with the fastening bolt 10 below a predetermined torque to transmit the rotational torque of the fastening bolt 10 to the collar bolt 21, and disengages when the predetermined torque is exceeded. The multi-purpose member 22 also allows the collar bolt 21 to move by a predetermined stroke length L in the axial direction of the collar bolt 21 in the direction of pulling it out of the adjuster nut 23, and restricts the collar bolt 21 from moving beyond the predetermined stroke length L. The adjuster nut 23 has a female thread 23b on at least a part of the inner surface of the collar bolt hole 23a that screws onto the male thread 21f of the collar bolt shaft portion 21b.

Description

Technical Field

[0001] The present invention relates to a spacing member and a fastening member.

Background Art

[0002] Conventionally, a fastening member for fixing a first member and a second member with a space therebetween is known. The fastening member includes a fastening bolt, an adjuster nut, a collar bolt, torque transmission means, and a fastening nut. As such a fastening member, for example, the one described in Patent Document 1 is known.

[0003] An external thread is formed on the outer surface of the fastening bolt. The fastening bolt passes through the adjuster nut, the collar bolt, and the torque transmission means and is screwed with the fastening nut. An internal thread that is screwed with the external thread of the fastening bolt is formed on the inner surface of the fastening nut.

[0004] An internal thread in the opposite direction to the fastening bolt is formed on the inner surface of the adjuster nut. The collar bolt is inserted into the adjuster nut. An external thread that is screwed with the internal thread of the adjuster nut is formed on the outer surface of the collar bolt. The torque transmission means is disposed inside the collar bolt. The torque transmission means transmits the rotational torque of the fastening bolt to the adjuster nut by engaging with the fastening bolt.

[0005] When fixing the first member and the second member with the above-described fastening member, first, the torque transmission means is disposed inside the collar bolt. Next, the collar bolt in which the torque transmission means is disposed is screwed with the adjuster nut. The collar bolt and the adjuster nut in which the torque transmission means is assembled are disposed between the first member and the second member disposed with a space therebetween. Further, the fastening nut is disposed on the surface of the first member opposite to the second member.

[0006] The fastening bolt is inserted through the second member and then into the collar bolt. The fastening bolt engages with a torque transmission means located inside the collar bolt. When the fastening bolt is rotated clockwise, the torque transmission means engaged with the fastening bolt also rotates clockwise. This clockwise rotation is then transmitted to the collar bolt via the torque transmission means. As the collar bolt rotates clockwise, it moves in a direction that pulls it out of the adjuster nut. This causes the collar bolt to move toward the second member and then come into contact with it. As a result, the lift-up load, which is the load in the direction that pulls the collar bolt out of the adjuster nut, is received by the second member.

[0007] The lift-up load is supported by the second member, restricting the movement of the collar bolt. As a result, the collar bolt cannot rotate any further. Consequently, if the fastening bolt is rotated further, slippage occurs between the fastening bolt and the torque transmission means. Furthermore, if the fastening bolt is rotated clockwise, only the fastening bolt moves toward the first member. Since a fastening nut is positioned on the first member, the male thread of the fastening bolt and the female thread of the fastening nut engage. This fixes the first member and the second member with a gap between them. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Patent No. 5388290 [Overview of the project] [Problems that the invention aims to solve]

[0009] According to the above technology, as long as the fastening bolt and the torque transmission means remain engaged, a lift-up load will be continuously applied from the collar bolt to the second member. Therefore, for example, if the second member deforms because it cannot withstand the lift-up load, continuing to rotate the fastening bolt clockwise will cause the collar bolt to move in a direction that pulls it out of the adjuster nut. Ultimately, this raises concerns that the collar bolt may fall out of the adjuster nut.

[0010] This invention was made in view of the above background, and aims to provide a spacing member and a fastening member that suppress the detachment of color bolts. [Means for solving the problem]

[0011] One aspect of the present invention is, A spacing member that maintains the distance between a first member and a second member, A collar bolt has a collar bolt shaft portion having a fastening bolt hole through which a fastening bolt is inserted, and a male thread is formed on the outer surface of the collar bolt shaft portion in the direction opposite to that of the fastening bolt, and the collar bolt presses against the second member, A torque transmission member that, when the torque is below a predetermined level, engages with the fastening bolt to transmit the rotational torque of the fastening bolt to the collar bolt, and disengages when the torque exceeds the predetermined level. The first member has a collar bolt hole through which the collar bolt shaft is inserted, and at least a portion of the inner surface of the collar bolt hole has a female thread that screws onto the male thread of the collar bolt shaft, and the first member has an adjuster nut fixed to it. A stopper that allows the collar bolt to move a predetermined stroke length in the axial direction of the collar bolt in the direction of being pulled out of the adjuster nut, and restricts the collar bolt from moving beyond the predetermined stroke length, It is located in a spacing member equipped with the following features.

[0012] Furthermore, other embodiments of the present invention include: The above-mentioned spacing member, The fastening bolt has a fastening bolt shaft portion with male threads formed on its outer surface, The fastening member comprises a fastening nut having a female thread that engages with the male thread on the fastening bolt shaft. [Effects of the Invention]

[0013] According to one and other embodiments of the present invention, when rotation is applied to a fastening bolt inserted through a fastening bolt hole in a collar bolt, the rotation of the fastening bolt is transmitted to the collar bolt via a torque transmission member. As a result, the rotation of the collar bolt causes it to move in a direction that pulls it out of the adjuster nut. Consequently, the collar bolt is prevented from moving beyond a predetermined stroke length in the direction that pulls it out of the adjuster nut. This prevents the collar bolt from falling out of the adjuster nut.

[0014] The reference numerals in parentheses in the claims indicate the correspondence with the specific means described in the embodiments later, and do not limit the technical scope of the present invention. [Brief explanation of the drawing]

[0015] [Figure 1] This is a cross-sectional view showing the state in which the first member and the second member are fixed together by a fastening member while maintaining a predetermined distance from each other, in the first embodiment. [Figure 2] This is an exploded side view showing the collar bolt, adjuster nut, and multi-purpose member among the spacing-holding members in Embodiment 1. [Figure 3] This is a plan view showing the adjuster nut in Embodiment 1. [Figure 4] This is a bottom view showing the adjuster nut in Embodiment 1. [Figure 5] This is a plan view showing the multi-purpose member in Embodiment 1. [Figure 6] This is a bottom view showing the multi-purpose member in Embodiment 1. [Figure 7]It is a cross-sectional view showing a state in which a color bolt, an adjuster nut, and a dual-purpose member are assembled in Embodiment 1, and is a cross-sectional view showing a locking structure between an outer locking claw and an outer peripheral flange. [Figure 8] It is a cross-sectional view showing a state in which a color bolt, an adjuster nut, and a dual-purpose member are assembled in Embodiment 1, and is a cross-sectional view showing an engaging structure between a rotation preventing portion and a slit. [Figure 9] It is a cross-sectional view showing a state in which a spacing holding member is assembled to a first member in Embodiment 1. [Figure 10] It is a cross-sectional view showing a state in which a fastening bolt penetrates a second member and is engaged with a dual-purpose member in Embodiment 1. [Figure 11] It is a cross-sectional view showing a state in which the axial movement of the color bolt is restricted in Embodiment 1. [Figure 12] It is a cross-sectional view showing Modification 1 of Embodiment 1. [Figure 13] It is a cross-sectional view showing Modification 2 of Embodiment 1. [Figure 14] It is a cross-sectional view showing a state in which a first member and a second member are fixed while maintaining a predetermined interval by a fastening member in Embodiment 2. [Figure 15] It is an exploded side view showing a spacing holding member in Embodiment 2. [Figure 16] It is a cross-sectional view showing a state in which a first member and a second member are fixed while maintaining a predetermined interval by a fastening member in Embodiment 3. [Figure 17] It is a cross-sectional view showing a state in which a first member and a second member are fixed while maintaining a predetermined interval by a fastening member in Embodiment 4. [Figure 18] It is a plan view showing a torque transmission member in Embodiment 4. [Figure 19] It is a cross-sectional view showing a state in which a first member and a second member are fixed while maintaining a predetermined interval by a fastening member in Embodiment 5. [Figure 20]This is a cross-sectional view showing the state in which the first member and the second member are fixed together by a fastening member while maintaining a predetermined distance from each other, according to Embodiment 6. [Figure 21] This is a cross-sectional view showing the state in which the first member and the second member are fixed together by a fastening member while maintaining a predetermined distance from each other, according to Embodiment 7. [Figure 22] This is a cross-sectional view showing the state in which the first member and the second member are fixed together by a fastening member while maintaining a predetermined distance from each other, in the embodiment 8. [Figure 23] This is a cross-sectional view showing the state in which the spacing member is assembled to the first member in Embodiment 9. [Figure 24] This is a cross-sectional view showing the state in which the first member and the second member are fixed together by a fastening member while maintaining a predetermined distance from each other, according to Embodiment 9. [Modes for carrying out the invention]

[0016] The spacing member maintains the distance between the first member and the second member. The spacing member comprises a collar bolt, a torque transmission member, an adjuster nut, and a stopper. The collar bolt has a collar bolt shaft portion having a fastening bolt hole through which a fastening bolt is inserted, and a male thread is formed on the outer surface of the collar bolt shaft portion in the opposite direction to the fastening bolt, and presses against the second member. The torque transmission member transmits the rotational torque of the fastening bolt to the collar bolt by engaging with the fastening bolt when the torque is below a predetermined torque, and disengages when the torque exceeds the predetermined torque.

[0017] The adjuster nut has a collar bolt hole through which the collar bolt shaft is inserted, and at least a portion of the inner surface of the collar bolt hole has a female thread that screws onto the male thread of the collar bolt shaft, and is fixed to the first member. The stopper allows the collar bolt to move a predetermined stroke length in the axial direction of the collar bolt in the direction of pulling it out of the adjuster nut, and restricts the collar bolt from moving beyond the predetermined stroke length.

[0018] The stopper may be mounted on the collar bolt in a manner that restricts its axial movement, and may also be configured to restrict the collar bolt from moving beyond a predetermined stroke length by contacting the adjuster nut from the axial direction. The stopper is mounted on the collar bolt in a manner that restricts its axial movement. Therefore, by the stopper contacting the adjuster nut from the axial direction, the collar bolt can be restricted from moving beyond a predetermined stroke length.

[0019] The stopper may be configured to be fixed to the collar bolt in a way that restricts its rotation around the axis of the collar bolt. This restricts the relative movement of the stopper and the collar bolt, thereby further restricting the collar bolt from moving beyond a predetermined stroke length.

[0020] The stopper may be positioned inside the collar bolt hole of the adjuster nut, and the stopper may be configured to restrict the movement of the collar bolt beyond a predetermined stroke length by abutting against the inside of the collar bolt hole from the axial direction. As a result, since the stopper is positioned inside the collar bolt hole of the adjuster nut, it is possible to suppress the enlargement of the spacing member.

[0021] The adjuster nut may be configured such that it is formed in the same direction as the female thread formed in the collar bolt hole and has a counterbore with an inner diameter larger than the inner diameter of the female thread, and the stopper contacts the axial end face of the counterbore from the axial direction to restrict the collar bolt from moving beyond a predetermined stroke length. In this way, the stopper can restrict the collar bolt from moving beyond a predetermined stroke length by contacting the axial end face of the counterbore from the axial direction.

[0022] The stopper may be configured to have an outer elastic claw formed to be elastically deformable radially outward of the collar bolt, and the collar bolt may be configured to have an outer flange formed on the outer surface of the collar bolt, which the outer elastic claw engages with. This allows the stopper and the collar bolt to be easily assembled by engaging the locking claw of the stopper with the outer flange of the collar bolt.

[0023] The collar bolt hole may be configured to have a deformation space to avoid interference with the outer elastic claw that elastically deforms radially outward. This prevents interference between the outer elastic claw and the inner surface of the collar bolt hole when the outer elastic claw elastically deforms. As a result, the outer elastic claw does not need to be positioned outside the collar bolt hole when it elastically deforms. Consequently, the spacing member as a whole can be made smaller.

[0024] The torque transmission member and the stopper may be configured as a single, integrated component. This reduces the number of parts.

[0025] The multi-purpose component may be configured to have a cylindrical portion through which a fastening bolt can be inserted, and the stopper may be formed to protrude radially outward from the outer surface of the cylindrical portion relative to the collar bolt.

[0026] The fastening member comprises a spacing member as described in any one of the above, a fastening bolt having a fastening bolt shaft portion with male threads formed on its outer surface, and a fastening nut having female threads that engage with the male threads on the fastening bolt shaft portion.

[0027] (Embodiment 1) 1. Configuration of fastening member 1a 1.1.Overall structure The overall structure of the fastening member 1a according to Embodiment 1 will be described with reference to Figures 1 to 8. The fastening member 1a fixes the first member 2 and the second member 3 while maintaining the distance between them. The fastening member 1a comprises a fastening bolt 10, a spacing member 20a, and a fastening nut 30. The spacing member 20a comprises a collar bolt 21, a multi-purpose member 22, an adjuster nut 23, and a clip 24. The multi-purpose member 22 is a torque transmission member and a stopper.

[0028] 1.2. First member 2 and second member 3 As shown in Figure 1, the first member 2 and the second member 3 are arranged opposite each other with a gap between them. The first member 2 and the second member 3 according to Embodiment 1 are formed in a plate shape. However, the shapes of the first member 2 and the second member 3 are not particularly limited. The first member 2 has a first through hole 2a that penetrates the first member 2. The second member 3 also has a second through hole 3a that penetrates the second member 3. Fastening bolts 10 are passed through the first through hole 2a and the second through hole 3a.

[0029] The first member 2 has clip locking holes 2b around the first through hole 2a, into which a clip 24, described later, is locked. The clip locking holes 2b are formed by penetrating the first member 2. The number of clip locking holes 2b is not particularly limited; there may be one or two or more.

[0030] 1.3. Fastening bolts 10 As shown in Figure 1, the fastening bolt 10 has a fastening bolt head 10a and a fastening bolt shaft 10b. The diameter of the fastening bolt head 10a is larger than the diameter of the fastening bolt shaft 10b. The fastening bolt head 10a according to Embodiment 1 includes a flange 10c. However, the flange 10c may be omitted.

[0031] The fastening bolt shaft portion 10b has a male thread 10d formed on its outer surface. In Embodiment 1, the male thread 10d formed on the outer surface of the fastening bolt shaft portion 10b is a right-hand thread. The base end portion of the fastening bolt shaft portion 10b does not have a male thread 10d formed on it and is a small-diameter portion 10e smaller than the outer diameter dimension of the male thread 10d. In Embodiment 1, the male thread 10d is formed only on the tip side of the fastening bolt shaft portion 10b. However, the male thread 10d may be formed along the entire length of the fastening bolt shaft portion 10b, or it may be formed in the middle portion in the longitudinal direction of the fastening bolt shaft portion 10b.

[0032] 1.4. Fastening nut 30 As shown in Figure 1, the fastening nut 30 according to Embodiment 1 is fixed to the surface of the first member 2 opposite to the surface facing the second member 3. The fastening nut 30 is fixed to the edge of the first through hole 2a of the first member 2. The fastening nut 30 and the first member 2 are fixed by known methods such as welding, brazing, or press-fitting. However, the fastening nut 30 and the first member 2 may not be fixed together. The fastening nut 30 has an internal female thread 30a that engages with the male thread 10d of the fastening bolt shaft portion 10b.

[0033] As shown in Figure 1, the small-diameter portion 10e of the fastening bolt 10 and the cylindrical portion 25 of the multi-purpose member 22 are configured to be positioned at separate locations in the axial direction of the color bolt 21 when the fastening bolt 10 and the fastening nut 30 are screwed together.

[0034] 1.5. Spacing member 20a As shown in Figure 1, the spacing member 20a is positioned between the first member 2 and the second member 3. The spacing member 20a maintains the distance between the first member 2 and the second member 3.

[0035] 1.6. Color Bolt 21 As shown in Figures 2 to 4, the color bolt 21 comprises a flange portion 21a, a color bolt shaft portion 21b, a fastening bolt hole 21c, a slit 21d, and an outer flange 21e. The flange portion 21a is formed at the end of the color bolt shaft portion 21b on the side of the second member 3. The cross-sectional dimension of the flange portion 21a is formed to be larger than the diameter of the color bolt shaft portion 21b.

[0036] As shown in Figure 3, the flange portion 21a according to Embodiment 1 is formed in an octagonal shape with rounded corners. However, the shape of the flange portion 21a is arbitrary; for example, it may be disc-shaped, or a polygonal shape such as a hexagon, and can be any shape. With the spacing member 20a fixed to the first member 2 and the second member 3, the flange portion 21a presses the second member 3 from the axial direction of the collar bolt 21.

[0037] The collar bolt 21 has a fastening bolt hole 21c through which the fastening bolt 10 is inserted. The collar bolt shaft portion 21b has a male thread 21f formed on its outer surface in the opposite direction to the male thread 10d formed on the fastening bolt 10. In Embodiment 1, the male thread 21f formed on the outer surface of the collar bolt shaft portion 21b is a reverse thread. However, it is also possible to have a configuration where the male thread 10d formed on the outer surface of the fastening bolt 10 is a reverse thread, and the male thread 21f formed on the outer surface of the collar bolt shaft portion 21b is a standard thread.

[0038] As shown in Figures 2 and 4, the collar bolt shaft portion 21b has a slit 21d extending axially from the axial end face of the collar bolt 21 opposite to the flange portion 21a. The slit 21d is formed in the region between the axial end face of the collar bolt 21 opposite to the flange portion 21a and the male thread 21f. In Embodiment 1, as shown in Figure 4, two slits 21d are formed at the end of the collar bolt shaft portion 21b. However, the number of slits 21d may be one or three or more. In Embodiment 1, the two slits 21d are arranged symmetrically with respect to the axis C of the collar bolt 21. However, the arrangement of the slits 21d may be asymmetrical with respect to the axis C of the collar bolt 21.

[0039] The outer flange 21e is formed on the end of the collar bolt shaft portion 21b in the axial direction C, opposite to the flange portion 21a, and protrudes radially outward from the collar bolt 21. There is a gap in the axial direction of the collar bolt 21 between the male thread 10d formed on the collar bolt shaft portion 21b and the outer flange 21e. The outer diameter of the outer flange 21e is smaller than the outer diameter of the threads of the male thread 10d of the collar bolt 21.

[0040] 1.7. Adjuster nut 23 As shown in Figure 1, the adjuster nut 23 has a collar bolt hole 23a through which the collar bolt shaft portion 21b is inserted. At least a portion of the inner surface of the collar bolt hole 23a has a female thread 23b that screws onto the male thread 21f of the collar bolt shaft portion 21b. The adjuster nut 23 is fixed to the first member 2 via a clip 24, which will be described later, while in contact with the surface of the first member 2 that faces the second member 3.

[0041] The collar bolt hole 23a of the adjuster nut 23 has a female thread 23b and a counterbore 23c formed in the axial direction of the collar bolt 21. The counterbore 23c has an inner diameter larger than the inner diameter of the female thread 23b. The counterbore 23c is drilled from the end of the adjuster nut 23 on the first member 2 side toward the second member 3.

[0042] 1.8. Clip 24 As shown in Figure 1, the clip 24 comprises a holding portion 24a for holding the adjuster nut 23 and a leg portion 24b for locking onto the first member 2. The holding portion 24a is formed in a cylindrical shape that extends in the axial direction of the collar bolt 21. The holding portion 24a holds the adjuster nut 23 while restricting its rotation around the axial direction of the collar bolt 21. The holding portion 24a also has a locking portion 24c at the end opposite to the first member 2 that protrudes radially inward from the collar bolt 21. The locking portion 24c abuts against the axial end face of the adjuster nut 23. As a result, the holding portion 24a holds the adjuster nut 23 while restricting its movement along the axial direction of the collar bolt 21.

[0043] However, although not shown in detail, the portion of the holding portion 24a on which the locking portion 24c is formed can be configured such that, for example, two slits extending in the axial direction of the collar bolt 21 form an elastic piece that extends in the axial direction of the collar bolt 21 and is elastically deformable radially outward from the collar bolt 21. This allows the locking portion 24c to lock onto the adjuster nut 23 when the adjuster nut 23 is assembled to the clip 24 by the elastic piece elastically deforming and then returning to its original shape. Alternatively, the holding portion 24a as a whole may be configured to be elastically deformable radially outward from the collar bolt 21.

[0044] The leg portion 24b is inserted into the clip locking hole 2b formed in the first member 2, causing it to elastically deform in the radial direction of the collar bolt 21. As a result, the leg portion 24b locks onto the edge of the clip locking hole 2b. Consequently, the clip 24 is fixed to the first member 2. In this way, the adjuster nut 23 is fixed to the first member 2 via the clip 24.

[0045] 1.9. Dual-purpose component 22 In Embodiment 1, as shown in Figures 2 and 5-6, the torque transmission member and the stopper are configured as a single, integrated multi-purpose member 22. The multi-purpose member 22 comprises a cylindrical portion 25 and a base portion 26.

[0046] The multi-purpose component 22 is mainly composed of resin. Here, "main component" means that it accounts for 50% or more by mass of the multi-purpose component 22. Any resin can be appropriately selected as the resin constituting the multi-purpose component 22, such as polyolefins such as polypropylene, polyesters such as polybutylene terephthalate, and polyamides such as 6,6-nylon. The resin may contain additives such as antioxidants, or fillers such as talc. However, the multi-purpose component 22 may also be made of metal.

[0047] The cylindrical portion 25 is formed in a cylindrical shape that extends in the axial direction of the color bolt 21. As shown in Figure 5, the cylindrical portion 25 has protrusions 25a that project radially inward from the inner surface of the cylindrical portion 25. Multiple protrusions 25a are formed at intervals in the circumferential direction of the color bolt 21. In Embodiment 1, the cylindrical portion 25 has three protrusions 25a. However, the number of protrusions 25a may be one to two, or four or more.

[0048] The protruding portion 25a is configured to engage with the male thread 10d of the fastening bolt 10, which is inserted through the cylindrical portion 25. In this way, the male thread 10d of the fastening bolt 10 and the protruding portion 25a of the multi-purpose member 22 engage, and below a predetermined torque, the rotational torque of the fastening bolt 10 is transmitted to the multi-purpose member 22. When the predetermined torque is exceeded, the male thread 10d of the fastening bolt 10 advances while forming a female thread in the protruding portion 25a, and then protrudes out of the cylindrical portion 25 in the axial direction of the collar bolt 21. This disengages the fastening bolt 10 from the multi-purpose member 22.

[0049] As shown in Figure 2, the base portion 26 is positioned at the axial end of the collar bolt 21 within the cylindrical portion 25. The base portion 26 includes an outer elastic claw 26a and a rotation-preventing portion 26b.

[0050] The base portion 26 is formed to protrude in a disc shape radially outward from the outer surface of the cylindrical portion 25 relative to the color bolt 21. However, the shape of the base portion 26 is not particularly limited and may be formed in a polygonal shape when viewed from the axial direction of the color bolt 21.

[0051] The outer elastic claws 26a are formed on the surface of the base portion 26 on the cylindrical portion 25 side, spaced apart in the circumferential direction of the color bolt 21. In Embodiment 1, eight outer elastic claws 26a are formed. The number of outer elastic claws 26a is not particularly limited and may be 1 to 7, or 8 or more.

[0052] The outer elastic claw 26a is formed to extend axially from the base portion 26 to the collar bolt 21. The outer elastic claw 26a is formed to be elastically deformable radially outward from the collar bolt 21. The outer elastic claw 26a engages with the outer flange 21e of the collar bolt 21 from the axial direction of the collar bolt 21. As a result, the multi-purpose member 22 is attached to the collar bolt 21 in a state where the axial movement of the collar bolt 21 is restricted.

[0053] As shown in Figure 7, the collar bolt hole 23a has a deformation space S to avoid interference with the outer elastic claw 26a which is elastically deformed radially outward from the collar bolt 21.

[0054] As shown in Figure 5, two anti-rotation portions 26b are formed on the surface of the base portion 26 facing the cylindrical portion 25, at positions symmetrical to the axis C of the color bolt 21. The number of anti-rotation portions 26b is not particularly limited and may be one or three or more. The anti-rotation portions 26b are positioned between a plurality of outer elastic claws 26a arranged at intervals in the circumferential direction of the color bolt 21.

[0055] As shown in Figure 2, the anti-rotation portion 26b is formed extending from the base portion 26 in the axial direction of the collar bolt 21. The anti-rotation portion 26b is formed in a plate shape. The protruding height dimension of the anti-rotation portion 26b from the base portion 26 is set to be substantially the same as the protruding height dimension of the outer elastic claw 26a from the base portion 26. Substantially the same includes cases where they are the same, as well as cases where they are not the same but can be determined to be substantially the same.

[0056] The rotation-retaining portion 26b is configured to be inserted into the slit 21d of the color bolt 21 from the axial direction of the color bolt 21, while the multi-purpose member 22 is assembled to the color bolt 21. As shown in Figure 8, the rotation-retaining portion 26b contacts the inner wall of the slit 21d from the circumferential direction of the color bolt 21, thereby restricting the rotation of the multi-purpose member 22 around the axis C of the color bolt 21. As a result, the multi-purpose member 22 is fixed to the color bolt 21 in a state where its rotation around the axis C of the color bolt 21 is restricted. Consequently, the rotational torque of the fastening bolt 10 is transmitted from the fastening bolt 10 to the multi-purpose member 22, and then from the rotation-retaining portion 26b of the multi-purpose member 22 to the color bolt 21.

[0057] The cylindrical portion 25 is positioned inside the fastening bolt hole 21c of the collar bolt 21, with the outer elastic claw 26a locked onto the outer flange 21e of the collar bolt 21. The base portion 26 is positioned outside the collar bolt 21 and axially outward from the collar bolt 21, with the outer elastic claw 26a locked onto the outer flange 21e of the collar bolt 21. The tip of the outer elastic claw 26a and the tip of the anti-rotation portion 26b are positioned outside the collar bolt 21 and radially outward from the collar bolt 21.

[0058] As shown in Figure 1, the base portion 26 is positioned inside the collar bolt hole 23a of the adjuster nut 23. The outer elastic claw 26a and the anti-rotation portion 26b formed on the base portion 26 contact the inside of the collar bolt hole 23a from the axial direction of the collar bolt 21, as shown in Figure 1, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L (see Figures 9 and 10), which will be described later. In detail, the outer elastic claw 26a and the anti-rotation portion 26b contact the axial end face 23d of the counterbore portion 23c of the collar bolt 21 from the axial direction of the collar bolt 21. This restricts the movement of the collar bolt 21 beyond the predetermined stroke length L.

[0059] The outer elastic claw 26a contacts the axial end face 23d of the counterbore portion 23c of the color bolt 21 from the axial direction of the color bolt 21, thereby clamping the outer flange 21e of the color bolt 21 between the outer elastic claw 26a and the base portion 26. This firmly positions the color bolt 21 and the shared member 22.

[0060] However, the cylindrical portion 25 may be omitted. In this case, the base portion 26 may be configured to have a through hole through which the fastening bolt 10 can be inserted, and a projection that protrudes radially inward within this through hole. In this case, the base portion 26 is a torque transmission member and a stopper.

[0061] 2. Operation of fastening member 1a Next, the operation of the fastening member 1a according to Embodiment 1 will be described with reference to Figures 1, 7, and 9 to 11. Note that the operation of the fastening member 1a is not limited to the following description.

[0062] First, the assembly process for the spacing member 20 will be explained with reference to Figures 7 to 9.

[0063] As shown in Figure 7, the collar bolt 21 is screwed onto the adjuster nut 23 by rotating the collar bolt 21 in a counterclockwise direction. The collar bolt 21 is screwed on until the flange portion 21a of the collar bolt 21 contacts the axial end face of the adjuster nut 23. As a result, the tip of the collar bolt 21 protrudes from the adjuster nut 23 in the axial direction of the collar bolt 21.

[0064] As shown in Figure 7, the multi-purpose member 22 is attached to the tip of the collar bolt 21 protruding from the adjuster nut 23. Specifically, with the anti-rotation portion 26b of the multi-purpose member 22 and the slit 21d of the collar bolt 21 aligned, the cylindrical portion 25 of the multi-purpose member 22 is inserted into the fastening bolt hole 21c of the collar bolt 21. Then, the outer elastic claw 26a of the multi-purpose member 22 contacts the outer flange 21e of the collar bolt 21 from the axial direction of the collar bolt 21. Also, the anti-rotation portion 26b of the multi-purpose member 22 is inserted into the slit 21d of the collar bolt 21 from the axial direction of the collar bolt 21.

[0065] Furthermore, when the cylindrical portion 25 is inserted into the color bolt 21, the outer elastic claw 26a elastically deforms radially outward from the color bolt 21. Since a deformation space S is formed in the adjuster nut 23, interference between the outer elastic claw 26a and the inner wall of the adjuster nut 23 is avoided.

[0066] Furthermore, when the cylindrical portion 25 is inserted into the interior of the collar bolt 21, the outer elastic claw 26a overcomes the outer flange 21e and deforms back to its original shape. As a result, the outer elastic claw 26a of the multi-purpose member 22 locks onto the outer flange 21e of the collar bolt 21 from the axial direction of the collar bolt 21. This fixes the multi-purpose member 22 to the collar bolt 21 in a state where the axial movement of the collar bolt 21 is restricted. Also, as shown in Figure 8, the rotation-retaining portion 26b contacts the inner wall of the slit 21d from the radial direction of the collar bolt 21, thereby fixing the multi-purpose member 22 in a state where the rotation of the collar bolt 21 around its axis C is restricted.

[0067] By rotating the color bolt 21 clockwise, the color bolt 21 is moved in a direction that removes it from the adjuster nut 23. As a result, as shown in Figure 9, the axial end face of the shared member 22 and the axial end face of the adjuster nut 23 on the first member 2 side are set to be substantially flush.

[0068] The adjuster nut 23 is attached to the holding portion 24a of the clip 24. The legs 24b of the clip 24 are inserted into the clip locking hole 2b of the first member 2, and the legs 24b are locked to the edge of the clip locking hole 2b. This fixes the adjuster nut 23 of the spacing holding member 20a to the first member 2, as shown in Figure 9.

[0069] As shown in Figure 9, with the spacing member 20a fixed to the first member 2, the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the tip of the outer elastic claw 26a and the anti-rotation portion 26b of the multi-purpose member 22 is set to a predetermined stroke length L.

[0070] Next, the process of fixing the first member 2 and the second member 3 with fastening bolts 10 will be explained with reference to Figures 1 and 10-11.

[0071] First, the fastening bolt 10 is inserted into the second through-hole 3a of the second member 3. Once the tip of the fastening bolt 10 comes into contact with the multi-purpose member 22, the fastening bolt 10 is rotated clockwise. This causes the male thread 10d of the fastening bolt 10 to engage with the protruding portion 25a of the cylindrical portion 25, as shown in Figure 10.

[0072] Furthermore, by rotating the fastening bolt 10 clockwise, the rotational torque of the fastening bolt 10 is transmitted to the collar bolt 21 via the multi-purpose member 22. The clockwise rotation of the fastening bolt 10 causes the collar bolt 21 to rotate clockwise as well. As a result, the collar bolt 21 moves in a direction that pulls it out of the adjuster nut 23.

[0073] Furthermore, the fastening bolt 10 is rotated so that the flange portion 21a of the color bolt 21 comes into contact with the second member 3 from the axial direction of the color bolt 21, as shown in Figure 11.

[0074] In this state, the outer elastic claw 26a and the anti-rotation portion 26b of the multi-purpose member 22 come into contact with the axial end face 23d of the counterbore portion 23c of the adjustment nut from the axial direction. This restricts the collar bolt 21 from moving beyond a predetermined stroke length L.

[0075] Furthermore, when the fastening bolt 10 is rotated clockwise, the collar bolt 21 is restricted from moving axially, so the fastening bolt 10 bites into the protruding portion 25a of the cylindrical portion 25 and advances while forming an internal thread. When the fastening bolt 10 is rotated further clockwise, the male thread 10d of the fastening bolt 10 penetrates the cylindrical portion 25.

[0076] Furthermore, the fastening bolt 10 is rotated to screw it onto the fastening nut 30. As a result, the first member 2 and the second member 3 are fixed together with a predetermined distance between them, as shown in Figure 1.

[0077] 3. Effects of Embodiment 1 Next, the effects of Embodiment 1 will be described. The spacing member 20a according to Embodiment 1 maintains the distance between the first member 2 and the second member 3. The spacing member 20a comprises a collar bolt 21, a multi-purpose member 22, and an adjuster nut 23. The collar bolt 21 has a collar bolt shaft portion 21b having a fastening bolt hole 21c through which a fastening bolt 10 is inserted, and a male thread 21f is formed on the outer surface of the collar bolt shaft portion 21b in the opposite direction to the fastening bolt 10, and presses against the second member 3.

[0078] The dual-purpose member 22 engages with the fastening bolt 10 below a predetermined torque, thereby transmitting the rotational torque of the fastening bolt 10 to the collar bolt 21, and disengages when the predetermined torque is exceeded. The dual-purpose member 22 also allows the collar bolt 21 to move by a predetermined stroke length L in the axial direction of the collar bolt 21 in the direction of being pulled out of the adjuster nut 23, and restricts the collar bolt 21 from moving beyond the predetermined stroke length L. The adjuster nut 23 has a collar bolt hole 23a through which the collar bolt shaft portion 21b is inserted, and at least a part of the inner surface of the collar bolt hole 23a has a female thread 23b that screws onto the male thread 21f of the collar bolt shaft portion 21b, and is fixed to the first member 2.

[0079] Furthermore, the fastening member 1a according to Embodiment 1 comprises the above-mentioned spacing member 20a, a fastening bolt 10 having a fastening bolt shaft portion 10b with a male thread 10d formed on its outer surface, and a fastening nut 30 having a female thread 30a that screws into the male thread 10d of the fastening bolt shaft portion 10b.

[0080] According to Embodiment 1, when a clockwise rotation is applied to the fastening bolt 10 inserted through the fastening bolt hole 21c of the collar bolt 21, the clockwise rotation is transmitted to the collar bolt 21 via the multi-purpose member 22. As a result, the clockwise rotation of the collar bolt 21 causes it to move in a direction that pulls it out of the adjuster nut 23. According to Embodiment 1, the collar bolt 21 is restricted from moving beyond a predetermined stroke length L in the direction that pulls it out of the adjuster nut 23. This prevents the collar bolt 21 from falling out of the adjuster nut 23.

[0081] In Embodiment 1, the multi-purpose member 22 is attached to the collar bolt 21 in a state where its axial movement is restricted, and by contacting the adjuster nut 23 from the axial direction, it restricts the collar bolt 21 from moving beyond a predetermined stroke length L.

[0082] According to Embodiment 1, the multi-purpose member 22 is attached to the collar bolt 21 in a state where its axial movement is restricted. Therefore, by the multi-purpose member 22 contacting the adjuster nut 23 from the axial direction, the collar bolt 21 can be prevented from moving beyond a predetermined stroke length L.

[0083] In Embodiment 1, the multi-purpose member 22 is fixed to the color bolt 21 in a state in which its rotation around the axis C of the color bolt 21 is restricted.

[0084] According to Embodiment 1, since the relative movement of the shared member 22 and the color bolt 21 is restricted, the movement of the color bolt 21 beyond a predetermined stroke length L can be further restricted.

[0085] In Embodiment 1, the base portion 26, the outer elastic claw 26a, and the anti-rotation portion 26b are arranged inside the collar bolt hole 23a of the adjuster nut 23, and the outer elastic claw 26a and the anti-rotation portion 26b contact the inside of the collar bolt hole 23a from the axial direction, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L.

[0086] According to Embodiment 1, since the base portion 26, the outer elastic claw 26a, and the anti-rotation portion 26b are arranged inside the collar bolt hole 23a of the adjustment nut, it is possible to suppress an increase in the size of the spacing holding member 20a.

[0087] In Embodiment 1, the adjuster nut 23 includes a female thread 23b with a 30a formed on the inner wall of the collar bolt hole 23a, and a counterbore portion 23c formed in the collar bolt hole 23a adjacent to the female thread 23b in the axial direction and having an inner diameter larger than the inner diameter of the female thread 23b. The outer elastic claw 26a and the anti-rotation portion 26b contact the axial end face 23d of the counterbore portion 23c from the axial direction, thereby restricting the collar bolt 21 from moving beyond a predetermined stroke length L.

[0088] According to Embodiment 1, the outer elastic claw 26a and the anti-rotation portion 26b contact the axial end face 23d of the counterbore portion 23c from the axial direction, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L.

[0089] In Embodiment 1, the multi-purpose member 22 is provided with an outer elastic claw 26a that is elastically deformable outward in the radial direction of the color bolt 21, and the color bolt 21 is provided with an outer peripheral flange 21e formed on the outer surface of the color bolt 21 and which the outer elastic claw 26a engages with.

[0090] According to Embodiment 1, the dual-purpose member 22 and the color bolt 21 can be easily assembled by engaging the outer elastic claw 26a with the outer flange 21e of the color bolt 21.

[0091] In Embodiment 1, the outer elastic claw 26a abuts against the inside of the collar bolt hole 23a from the axial direction.

[0092] According to Embodiment 1, the outer elastic claw 26a abuts against the inside of the collar bolt hole 23a from the axial direction, thereby preventing the outer elastic claw 26a from coming off the outer flange 21e.

[0093] In Embodiment 1, multiple outer elastic claws 26a are formed at intervals in the circumferential direction of the color bolt 21.

[0094] According to Embodiment 1, the multi-purpose member 22 can be firmly attached to the color bolt 21 by engaging the multiple outer elastic claws 26a with the outer flange 21e.

[0095] In Embodiment 1, the collar bolt hole 23a has a deformation space S to avoid interference with the outer elastic claw 26a which is elastically deformed radially outward.

[0096] According to Embodiment 1, interference between the outer elastic claw 26a and the inner surface of the collar bolt hole 23a can be avoided when the outer elastic claw 26a undergoes elastic deformation. As a result, the outer elastic claw 26a does not need to be positioned outside the collar bolt hole 23a when the outer elastic claw 26a undergoes elastic deformation. Consequently, the spacing member 20a can be made smaller overall.

[0097] In Embodiment 1, the multi-purpose member 22 is fixed to the color bolt 21 in a state in which its rotation around the axis C of the color bolt 21 is restricted.

[0098] According to Embodiment 1, since the relative movement of the shared member 22 and the color bolt 21 is restricted, the movement of the color bolt 21 beyond a predetermined stroke length L can be further restricted.

[0099] In Embodiment 1, the color bolt 21 is provided with a slit 21d extending axially from the axial end face of the color bolt 21, and the multi-purpose member 22 is a projection inserted into the slit 21d and is provided with a rotation-retaining portion 26b that abuts against the inner wall of the slit 21d from the circumferential direction of the color bolt 21, thereby restricting the rotation of the multi-purpose member 22 around the axis C.

[0100] According to Embodiment 1, the relative misalignment between the shared member 22 and the color bolt 21 can be further suppressed.

[0101] In Embodiment 1, the anti-rotation portion 26b abuts against the inside of the collar bolt hole 23a from the axial direction.

[0102] According to Embodiment 1, the anti-rotation portion 26b contacts the inside of the collar bolt hole 23a, thereby suppressing relative misalignment between the multi-purpose member 22 and the adjuster nut 23. This further suppresses relative misalignment between the multi-purpose member 22, the collar bolt 21, and the adjuster nut 23.

[0103] In Embodiment 1, the torque transmission member and the stopper constitute a single, integrated member 22. This reduces the number of parts.

[0104] In Embodiment 1, the multi-purpose member 22 includes a cylindrical portion 25 through which a fastening bolt can be inserted, and the base portion 26, the outer elastic claw 26a, and the anti-rotation portion 26b are formed to protrude radially outward from the outer surface of the cylindrical portion 25 relative to the collar bolt 21.

[0105] In Embodiment 1, the cylindrical portion 25 has a projection 25a that protrudes radially inward from the inner surface of the cylindrical portion 25 and engages with the male thread 10d of the fastening bolt 10 inserted through the cylindrical portion 25.

[0106] According to Embodiment 1, the fastening bolt 10 is screwed into the projection 25a while engaging with it. As a result, the fastening bolt 10 transmits rotational torque while forming an internal thread in the projection 25a. By rotating the fastening bolt 10 clockwise, the collar bolt 21 moves in the axial direction away from the adjuster nut 23. When the axial movement of the shared member 22 is restricted, the axial movement of the adjuster nut 23 is also restricted. When the fastening bolt 10 is further rotated clockwise, the fastening bolt 10 advances axially while forming an internal thread in the projection 25a, and then the fastening bolt 10 is removed from the projection 25a. After that, the fastening bolt 10 is screwed into the fastening nut 30.

[0107] In Embodiment 1, the multi-purpose member 22 is composed mainly of resin.

[0108] According to Embodiment 1, manufacturing costs can be reduced compared to the case where the multi-purpose member 22 is made of metal.

[0109] In Embodiment 1, the base portion 26 is located at the axial end of the cylindrical portion 25.

[0110] According to Embodiment 1, it is possible to suppress the axial increase in size of the multi-purpose member 22.

[0111] In Embodiment 1, the base end portion of the fastening bolt shaft portion 10b does not have a male thread 10d formed on it, and is a small-diameter portion 10e smaller than the outer diameter dimension of the male thread 10d, and when the fastening bolt 10 and the fastening nut 30 are screwed together, the small-diameter portion 10e and the cylindrical portion 25 are separated.

[0112] According to Embodiment 1, the fastening bolt 10 rotates freely after being withdrawn from the cylindrical portion 25. This reduces the burden of the work of screwing the fastening bolt 10 and the fastening nut 30 together. Furthermore, the tightening torque of the fastening bolt 10 and the fastening nut 30 can be controlled.

[0113] (Modification 1 of Embodiment 1) In the fastening member 1a of Embodiment 1, the adjuster nut 23 is fixed to the first member 2 by a clip 24. Alternatively, as shown in Figure 12, in the fastening member 1a1 according to Modification 1 of Embodiment 1, the adjuster nut 23 can be fixed to the surface of the first member 2 facing the second member 3 by welding, brazing, press-fitting, etc. According to Modification 1 of Embodiment 1, the clip 24 can be omitted, thus reducing the number of parts in the fastening member 1a. In addition, the step of forming a clip locking hole 2b in the first member 2 can be omitted.

[0114] (Modification of Embodiment 1, Part 2) In the spacing member 20a of Embodiment 1, the adjuster nut 23 is configured to have a deformation space S. In addition, as shown in Figure 13, in the indirect holding member 20a2 according to deformation mode 2 of Embodiment 1, the adjuster nut 23 can also be configured not to have a deformation space S.

[0115] In the modified form 2 of Embodiment 1, the axial length dimension of the color bolt 21 is set to be larger than the axial length dimension of the color bolt 21 in Embodiment 1. As a result, even when the outer elastic claw 26a of the multi-purpose member 22 is elastically deformed radially outward when the flange portion 21a of the color bolt 21 is in contact with the axial end face of the adjuster nut 23, interference between the outer elastic claw 26a and the adjuster nut 23 is suppressed.

[0116] According to the modified form 2 of Embodiment 1, the inner diameter of the counterbore portion 23c of the adjuster nut 23 can be reduced.

[0117] In the modified form 2 of Embodiment 1, the multi-purpose member 22 abuts against the axial end face 23d of the counterbore portion 23c from the axial direction, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L. Furthermore, the multi-purpose member 22 according to the modified form 2 of Embodiment 1 can restrict the movement of the collar bolt 21 beyond a predetermined stroke length L by abutting against the threads of the female thread 23b of the collar bolt hole 23a from the axial direction.

[0118] (Embodiment 2) Next, Embodiment 2 will be described with reference to Figures 14 and 15. Note that, unless otherwise specified, reference numerals used in Embodiment 2 that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0119] As shown in Figure 14, the fastening member 1b in Embodiment 2 differs from the fastening member 1a in Embodiment 1 in that the torque transmission member 35 and the stopper 36 are formed separately.

[0120] As shown in Figure 15, the spacing member 20b according to Embodiment 2 comprises a collar bolt 21, a torque transmission member 35, a stopper 36, an adjuster nut 23, and a clip 24. The collar bolt 21, adjuster nut 23, and clip 24 are the same as those in Embodiment 1, so their description is omitted.

[0121] The torque transmission member 35 is mainly composed of resin. Any resin can be appropriately selected as the resin constituting the torque transmission member 35, including polyolefins such as polypropylene, polyesters such as polybutylene terephthalate, and polyamides such as 6,6-nylon. The resin may contain additives such as antioxidants, or fillers such as talc.

[0122] The torque transmission member 35 includes a cylindrical portion 35a that penetrates the collar bolt 21 in the axial direction. The cylindrical portion 35a is formed in a cylindrical shape that extends in the axial direction of the collar bolt 21. Although not shown in detail, the cylindrical portion 35a includes a projection that protrudes radially inward from the inner surface of the cylindrical portion 35a relative to the collar bolt 21. The configuration of the projection is the same as in Embodiment 1, so a redundant explanation will be omitted.

[0123] As shown in Figure 15, the cylindrical portion 35a is provided with a rotation-retaining portion 35b that protrudes radially outward from the outer surface of the cylindrical portion 35a relative to the collar bolt 21. The rotation-retaining portion 35b is formed in a plate shape that extends in the axial direction of the collar bolt 21. The rotation-retaining portion 35b is formed at a position corresponding to the slit 21d of the collar bolt 21. Two rotation-retaining portions 35b are formed at positions symmetrical with respect to the axis C of the collar bolt 21.

[0124] The outer diameter of the cylindrical portion 35a in Embodiment 2 is the same as, or slightly larger than, the inner diameter of the fastening bolt hole 21c of the color bolt 21. This configuration allows the cylindrical portion 35a to be press-fitted into the fastening bolt hole 21c of the color bolt 21. However, the torque transmission member 35 may also be configured to have a press-fitting projection that protrudes outward from the outer surface of the cylindrical portion 35a. This causes the press-fitting projection to be crushed when the cylindrical portion 35a is inserted into the fastening bolt hole 21c of the color bolt 21. As a result, the cylindrical portion 35a can be press-fitted into the fastening bolt hole 21c of the color bolt 21.

[0125] The rotation-retaining portion 35b is configured such that, with the torque transmission member 35 assembled to the collar bolt 21, it is inserted into the slit 21d of the collar bolt 21 from the axial direction of the collar bolt 21. The rotation-retaining portion 35b contacts the inner wall of the slit 21d from the circumferential direction of the collar bolt 21, thereby restricting the rotation of the torque transmission member 35 around the axis C of the collar bolt 21. As a result, the torque transmission member 35 is fixed to the collar bolt 21 in a state where its rotation around the axis C of the collar bolt 21 is restricted. Consequently, the rotational torque of the fastening bolt 10 is transmitted from the fastening bolt 10 to the torque transmission member 35, and then transmitted from the rotation-retaining portion 35b of the torque transmission member 35 to the collar bolt 21.

[0126] The stopper 36 according to Embodiment 2 is mainly composed of a rubber-like elastic material such as rubber or elastomer. Here, "main component" means that it accounts for 50% or more by mass of the stopper 36. In Embodiment 2, the material constituting the torque transmission member 35 and the material constituting the stopper 36 are different.

[0127] The stopper 36 is formed in a ring shape. The cross-sectional shape of the stopper 36 can be any shape that is appropriate, such as a circular shape, an elliptical shape, or a polygonal shape. As shown in Figure 14, the stopper 36 is configured to be fitted into the area between the male thread 21f and the outer flange 21e of the collar bolt shaft portion 21b of the collar bolt 21.

[0128] As shown in Figure 14, the stopper 36 is positioned inside the collar bolt hole 23a of the adjuster nut 23. As shown in Figure 14, the stopper 36 contacts the inside of the collar bolt hole 23a from the axial direction of the collar bolt 21, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L. In detail, the ring member contacts the axial end face 23d of the counterbore portion 23c of the collar bolt 21 from the axial direction of the collar bolt 21, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L. Furthermore, the stopper 36 engages with the female thread 23b of the adjuster nut 23, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L.

[0129] However, although not shown in detail in the figure, the predetermined stroke length L in Embodiment 2 is set to the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the stopper 36 when the spacing member 20b is fixed to the first member 2.

[0130] According to Embodiment 2, by using different materials for the torque transmission member 35 and the stopper 36, the degree of design freedom for the spacing holding member 20b can be improved.

[0131] According to Embodiment 2, the stopper 36 fitted to the outer surface of the color bolt 21 can prevent the color bolt 21 from coming out of the adjuster nut 23.

[0132] (Embodiment 3) Next, Embodiment 3 will be described with reference to Figure 16. Note that, unless otherwise specified, any reference numerals used in Embodiment 3 that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0133] As shown in Figure 16, in the fastening member 1c of Embodiment 3, the collar bolt 41 does not have an outer flange 21e. Furthermore, the stopper 46 is made of metal, is formed in a ring shape, and is fixed to the axial end face of the collar bolt 41. The fastening member 1c in Embodiment 3 differs from that in Embodiment 2 in the above configuration.

[0134] As shown in Figure 16, the spacing member 20c according to Embodiment 3 comprises a collar bolt 41, a torque transmission member 35, a stopper 46, an adjuster nut 23, and a clip 24. The adjuster nut 23 and the torque transmission member 35 are the same as those in Embodiment 2, so their description is omitted.

[0135] The stopper 46 is made of metal and is formed in a ring shape. The stopper 46 is fixed to the axial end face of the color bolt 41 in a state where its axial movement is restricted by known methods such as welding, brazing, bonding, or press-fitting. The metal constituting the stopper 46 can be any metal that can be appropriately selected, such as iron, stainless steel, copper, copper alloy, aluminum, or aluminum alloy.

[0136] As shown in Figure 16, the stopper 46 is positioned inside the collar bolt hole 23a of the adjuster nut 23. The stopper 46 restricts the movement of the collar bolt 21 beyond a predetermined stroke length L by contacting the inside of the collar bolt hole 23a from the axial direction of the collar bolt 21. More specifically, the stopper 46 restricts the movement of the collar bolt 41 beyond a predetermined stroke length L by contacting the axial end face 23d of the counterbore portion 23c of the collar bolt 21 from the axial direction of the collar bolt 41.

[0137] However, although not shown in detail in the figure, the predetermined stroke length L in Embodiment 3 is set to the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the stopper 46 when the spacing member 20c is fixed to the first member 2.

[0138] According to Embodiment 3, the stopper 46 fixed to the axial end face of the color bolt 41 can prevent the color bolt 41 from coming out of the adjustment nut.

[0139] (Embodiment 4) Next, Embodiment 4 will be described with reference to Figures 17 and 18. Note that, unless otherwise specified, reference numerals used in Embodiment 4 that are the same as those used in previously described embodiments represent the same components as those in the previously described embodiments.

[0140] In Embodiment 4, the fastening member 1d and the spacing member 20d are made of an elastically deformable metal. As shown in Figure 18, the torque transmission member 55 comprises a main body 55a, an elastic piece 55b, and a rotation-preventing piece 55c. The fastening member 1d in Embodiment 4 differs from that in Embodiment 3 in the above configuration.

[0141] As shown in Figure 18, the torque transmission member 55 is formed in a roughly C-shape overall when viewed from the axial direction of the color bolt 21. The torque transmission member 55 is formed by press-forming a metal sheet material into a predetermined shape.

[0142] The main body portion 55a is formed by bending a metal plate into a roughly C-shape. When viewed from the axial direction of the color bolt 21, the space enclosed by the main body portion 55a is the insertion space IS through which the fastening bolt 10 is inserted.

[0143] As shown in Figures 17 and 18, the elastic piece 55b is formed to protrude inward from the main body 55a into the insertion space IS. The elastic piece 55b is configured to be elastically deformable in the radial direction of the color bolt 21. Furthermore, as shown in Figure 17, the elastic piece 55b is configured to be in contact with the fastening bolt 10 inserted into the insertion space IS. A detailed explanation follows below.

[0144] When the fastening bolt 10 is inserted into the insertion space IS, the outer surface of the fastening bolt 10 and the elastic piece 55b come into contact. The elastic piece 55b is then pressed against the outer surface of the fastening bolt 10 and elastically deforms radially outward. This generates an elastic force in radially inward on the elastic piece 55b. This elastic force causes the elastic piece 55b to firmly engage with the outer surface of the fastening bolt 10. As a result, the rotational torque of the fastening bolt 10 is transmitted to the torque transmission member 35 via the elastic piece 55b.

[0145] As shown in Figure 18, the anti-rotation piece 55c is formed to protrude radially outward from the main body 55a. Although not shown in detail, the anti-rotation piece 55c engages with the inner surface of the fastening bolt hole 21c of the collar bolt 21. As a result, the rotational torque of the torque transmission member 35 is transmitted to the collar bolt 21 via the anti-rotation piece 55c. However, the anti-rotation piece 55c may be omitted if, for example, the main body 55a and the collar bolt shaft portion 21b are fixed by adhesive, brazing, or the like.

[0146] According to Embodiment 4, the elastic piece 55b of the torque transmission member 35 comes into contact with the fastening bolt 10, thereby transmitting rotational torque from the fastening bolt 10 to the collar bolt 21 via the torque transmission member 35.

[0147] Although not shown in detail in the figure, the predetermined stroke length L in Embodiment 4 is set to the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the stopper 46 when the spacing member 20d is fixed to the first member 2.

[0148] (Embodiment 5) Next, Embodiment 5 will be described with reference to Figure 19. Note that, unless otherwise specified, any reference numerals used in Embodiment 5 that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0149] In Embodiment 5, the fastening member 1e and the spacing member 20e have an outer flange 21e on the collar bolt 21, as shown in Figure 19. The stopper 66 is also made mainly of resin. The fastening member 1e in Embodiment 5 differs from that in Embodiment 4 in the above configuration.

[0150] The stopper 66 according to Embodiment 5 differs from the stopper 36 according to Embodiment 1 in that it does not have a cylindrical portion 25. However, the stopper 66 according to Embodiment 5 may or may not have the rotation-retaining portion 26b according to Embodiment 1. The stopper 66 according to Embodiment 5 is the same as that of Embodiment 1 in all other respects, so redundant explanations will be omitted.

[0151] The fastening member 1e according to Embodiment 5 provides the same effects as the fastening member 1a according to Embodiment 1 and the fastening member 1d according to Embodiment 4.

[0152] Although not shown in detail in the figure, the predetermined stroke length L in Embodiment 5 is set to the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the tip of the outer elastic claw 26a when the spacing member 20e is fixed to the first member 2.

[0153] (Embodiment 6) Next, Embodiment 6 will be described with reference to Figure 20. Note that, unless otherwise specified, any reference numerals used in Embodiment 6 that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0154] In the fastening member 1f and spacing member 20f according to Embodiment 6, the dual-purpose member 72, as shown in Figure 20, is equipped with an inner elastic claw 72a that is elastically deformable inward in the radial direction of the color bolt 71, instead of an outer elastic claw 26a. However, although not shown in detail, the inner elastic claw 72a may be formed in a strip shape by being surrounded by a substantially U-shaped slit formed in the cylindrical portion 25. This allows the inner elastic claw 72a to be easily elastically deformed.

[0155] The color bolt 71 is provided with an inner circumferential flange 71a formed on the inner surface of the fastening bolt hole 21c of the color bolt 71, and which engages with the inner elastic claw 72a. Embodiment 6 differs from Embodiment 1 in the above configuration.

[0156] In Embodiment 6, the inner elastic claw 72a abuts against the inner flange 71a of the collar bolt 71 from the axial direction. As a result, the multi-purpose member 72 is fixed to the collar bolt 71 in a state where its axial movement is restricted.

[0157] According to Embodiment 6, the inner elastic claw 72a elastically deforms radially inward of the collar bolt 71. This prevents the spacing member 20 from becoming larger overall in the radial direction.

[0158] However, although not shown in detail in the figure, the predetermined stroke length L in Embodiment 6 is set to the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the base portion 26 when the spacing member 20f is fixed to the first member 2.

[0159] (Embodiment 7) Next, Embodiment 7 will be described with reference to Figure 21. Note that, unless otherwise specified, any reference numerals used in Embodiment 7 that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0160] In the fastening member 1g and spacing member 20g according to Embodiment 7, as shown in Figure 21, the stopper 86 is positioned outside the adjuster nut 23 and outward in the axial direction. The stopper 86 is fixed to the axial end face of the collar bolt 21 by known methods such as bonding, welding, or brazing. The stopper 86 contacts the axial end face 23e of the adjuster nut 23, thereby restricting the movement of the collar bolt 21 beyond a predetermined stroke length L. The outer diameter of the stopper 86 in Embodiment 7 is smaller than the outer diameter of the adjuster nut 23. This configuration avoids interference between the stopper 86 and the ring member 23f, which will be described later.

[0161] A ring-shaped ring member 23f is positioned on the axial end face 23e of the adjuster nut 23, near the outer edge of the adjuster nut 23. The ring member 23f is made of metal. The ring member 23f is positioned between the first member 2 and the adjuster nut 23. The ring member 23f holds the adjuster nut 23 and the first member 2 at a predetermined distance. The ring member 23f may be fixed to the axial end face 23e of the adjuster nut 23, or it may be fixed to the first member 2. Alternatively, the ring member 23f may not be fixed to the adjuster nut 23 or the first member 2.

[0162] The fastening member 1g in Embodiment 7 differs from that in Embodiment 3 in the configuration described above. The other configurations are the same as in Embodiment 3, so redundant explanations are omitted.

[0163] According to Embodiment 7, the stopper 86 abuts against the axial end face 23e of the adjuster nut 23. This prevents the collar bolt 21 from moving beyond a predetermined stroke length L.

[0164] However, although not shown in detail in the figure, the predetermined stroke length L in Embodiment 7 is set to the distance between the axial end face 23d of the counterbore portion 23c of the adjuster nut 23 and the stopper 86 when the spacing member 20g is fixed to the first member 2.

[0165] (Embodiment 8) Next, Embodiment 8 will be described with reference to Figure 22. Note that, unless otherwise specified, reference numerals used in Embodiment 8 that are the same as those used in the previously described embodiments represent the same components as those in the previously described embodiments.

[0166] In the fastening member 1h and the spacing member 20h according to Embodiment 8, the clip 24 is omitted, as shown in Figure 22. The adjuster nut 93 according to Embodiment 8 is fixed to the surface of the second member 3 facing the first member 2 by known methods such as welding, brazing, or press-fitting.

[0167] A nut flange 93a is formed on the outer surface of the adjuster nut 93, which protrudes radially outward from the color bolt 21.

[0168] In Embodiment 8, the stopper 96 is located outside the adjuster nut 93 and is positioned outward in the axial direction. The stopper 96 is attached to the flange portion 21a of the color bolt 21. The stopper 96 is formed in a cylindrical shape that extends in the axial direction of the color bolt 21. The stopper 96 is mainly composed of resin.

[0169] One end of the collar bolt 21 of the stopper 96 is fixed to the flange portion 21a in such a way that the flange portion 21a restricts the collar bolt 21 from rotating around its axis C.

[0170] The other axial end of the stopper 96 of the collar bolt 21 protrudes radially inward from the collar bolt 21 and is equipped with a nut locking claw 96a that engages with the nut flange 93a of the adjuster nut 93. The nut locking claw 96a engages with the nut flange 93a from the axial direction of the collar bolt 21. As a result, the stopper 96 can restrict the movement of the collar bolt 21 beyond a predetermined stroke length L.

[0171] However, although not shown in detail in the figure, the predetermined stroke length L in Embodiment 8 is set to the distance between the surface of the nut flange 93a facing the first member 2 and the nut locking claw 96a when the spacing member 20h is fixed to the first member 2.

[0172] (Embodiment 9) Next, Embodiment 9 will be described with reference to Figures 23 to 24. Note that, unless otherwise specified, reference numerals used in Embodiment 9 that are the same as those used in previously described embodiments represent the same components as those in the previously described embodiments.

[0173] In the fastening member 1i and the spacing member 20i according to Embodiment 9, as shown in Figure 23, the stopper portion 106 (an example of a stopper) is formed integrally with the clip 104. The holding portion 24a of the clip 104 holds the adjuster nut 23.

[0174] In Embodiment 9, the stopper portion 106 is formed extending from the tip of the holding portion 24a of the clip 104 along the axial direction of the collar bolt 101. The stopper portion 106 is provided with a locking claw 106a at its tip that protrudes radially inward from the collar bolt 101. The radial thickness dimension of the stopper portion 106 relative to the collar bolt 101 is set to be smaller than the radial thickness dimension of the holding portion 24a of the clip 104 relative to the collar bolt 101. As a result, the stopper portion 106 is formed to be elastically deformable in the radial direction of the collar bolt 101.

[0175] On the flange portion 21a of the color bolt 101, a locking recess 101a is formed on the surface facing the second member 3, which engages with the locking claw 106a of the stopper portion 106. The locking recess 101a is formed near the edge of the flange portion 21a.

[0176] A contact projection 21g is formed on the upper surface of the flange portion 21a of the color bolt 101, projecting in the axial direction of the color bolt 101. As shown in Figure 23, when the spacing member 20i is fixed to the first member 2 and the color bolt 21 is in contact with the first member 2, the tip of the contact projection 21g is at the same height as the tip of the stopper portion 106, or slightly protruding. As shown in Figure 23, in embodiment 9, the predetermined stroke length L is the distance between the locking claw 106a and the locking recess 101a.

[0177] As shown in Figure 24, in Embodiment 9, when the fastening bolt 10 is screwed into the fastening nut 30, the locking claw 106a of the stopper portion 106 abuts against the locking recess 101a of the collar bolt 101 from the axial direction of the collar bolt 101.

[0178] According to Embodiment 9, the stopper portion 106, which is attached to the adjuster nut 23 in a state where its axial movement is restricted, abuts against the collar bolt 101 from the axial direction. This prevents the collar bolt 101 from moving beyond a predetermined stroke length L.

[0179] The present invention is not limited to the embodiments described above, and can be applied to various embodiments without departing from its spirit. [Explanation of symbols]

[0180] 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i: Fastening members, 2: First member, 3: Second member, 10: Fastening bolt, 10b: Fastening bolt shaft, 10e: Small diameter section, 10f: Male thread, 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i: Spacing members, 21, 41, 71, 101: Collar bolts, 21a: Flange section, 21b: Collar bolt shaft section, 21c: Fastening bolt hole, 21d: Slit, 21e: Outer flange, 22, 72: Multipurpose members, 23, 93 :Adjuster nut, 23a:Collar bolt hole, 23b:Female thread, 23c:Counterbore, 23d:Axial end face of counterbore, 23e:Axial end face of adjuster nut, 25:Cylinder, 25a:Protruding part, 26:Base part, 26a:Outer elastic claw, 26b:Rotation stopper, 30:Fastening nut, 35,55:Torque transmission member, 35a:Cylinder, 35b:Rotation stopper, 36,46,66,86,96:Stopper, 106:Stopper part, C:Axis, IS:Through space, L:Determined stroke length, S:Deformation space

Claims

1. Spacing members (20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h, 20i) that maintain the distance between the first member (2) and the second member (3), A collar bolt (21) is provided, which has a collar bolt shaft portion (21b) having a fastening bolt hole (21c) through which a fastening bolt (10) is inserted, and has a male thread (21f) formed on the outer surface of the collar bolt shaft portion in the opposite direction to the fastening bolt, and presses against the second member. A torque transmission member (22, 35, 55, 72) engages with the fastening bolt below a predetermined torque to transmit the rotational torque of the fastening bolt to the collar bolt, and disengages when the predetermined torque is exceeded. The collar bolt has a collar bolt hole (23a) through which the collar bolt shaft is inserted, and at least a part of the inner surface of the collar bolt hole has a female thread (23b) that screws onto the male thread of the collar bolt shaft, and the adjuster nut (23) is fixed to the first member, Stoppers (22, 36, 46, 66, 72, 86, 96, 106) that allow the collar bolt to move a predetermined stroke length (L) in the axial direction of the collar bolt in the direction of pulling it out of the adjuster nut, and that restrict the collar bolt from moving beyond the predetermined stroke length, A spacing member equipped with a spacing member.

2. The spacing member according to claim 1, wherein the stopper is attached to the collar bolt in a state in which its movement in the axial direction is restricted, and by contacting the adjuster nut from the axial direction, it restricts the collar bolt from moving beyond the predetermined stroke length.

3. The spacing member according to claim 2, wherein the stopper is fixed to the collar bolt in a state in which rotation around the axis (C) of the collar bolt is restricted.

4. The stopper is positioned inside the collar bolt hole of the adjuster nut. The spacing member according to claim 2, wherein the stopper contacts the inside of the collar bolt hole from the axial direction, thereby restricting the collar bolt from moving beyond the predetermined stroke length.

5. The adjuster nut comprises the female thread formed on the inner surface of the collar bolt hole and a counterbore (23c) formed in the axial direction and having an inner diameter larger than the inner diameter of the female thread, The spacing member according to claim 4, wherein the stopper contacts the axial end face (23d) of the counterbore from the axial direction, thereby restricting the collar bolt from moving beyond the predetermined stroke length.

6. The stopper comprises an outer elastic claw (26a) formed to be elastically deformable radially outward of the collar bolt, The spacing member according to claim 4, wherein the collar bolt is provided with an outer peripheral flange (21e) formed on the outer surface of the collar bolt and into which the outer elastic claw engages.

7. The spacing member according to claim 6, wherein the collar bolt hole has a deformation space (S) to avoid interference with the outer elastic claw which is elastically deformed radially outward.

8. The spacing member according to any one of claims 1 to 7, wherein the torque transmission member and the stopper constitute a dual-purpose member (22, 72) formed integrally.

9. The multi-purpose member has a cylindrical portion (25) through which the fastening bolt can be inserted, The spacing member according to claim 8, wherein the stopper is formed to protrude radially outward from the outer surface of the cylindrical portion relative to the collar bolt.

10. A spacing member according to any one of claims 1 to 7, The fastening bolt has a fastening bolt shaft portion (10b) on which a male thread (10d) is formed on the outer surface, A fastening member (1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i) comprising a fastening nut (30) having a female thread (30a) that engages with the male thread of the fastening bolt shaft.

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