JP2016217392A - Fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase fastening force in a fastening device such as a one-side bolt and the like.SOLUTION: A fastening device 1 has: a holding portion 10 disposed at a depth side; first and second rotary portions 15, 20 disposed at a front side and relatively rotatable to each other; a power transmission portion 25 disposed between the first and second rotary portions 15, 20 and the holding portion 10 for transmitting axial force; a depth-direction seat portion 21 formed on at least one of the first rotary portion and the second rotary portion; a depth-side engagement portion 60 axially held between the power transmission portion 25 and the holding portion 10; and a screwing portion 30. The front-direction seat portion 64 of the depth-side engagement portion 60 is moved radially outward to be projected radially outward by axial approach of the holding portion 10 and the power transmission portion 25, and engaged with a fastened member H by utilizing the front-direction seat portion 64 and the depth-direction seat portion 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fastening device that fastens a body to be fastened.

  Conventionally, a screw fastening body is used in various scenes to fasten a body to be fastened. The screw fastening body includes a male screw body (male fastening body) in which a spiral groove is formed on a columnar outer periphery, and a female screw body (female fastening body) in which a spiral groove is formed on the inner periphery of the cylindrical member. It is the structure which screwes together.

  By the way, some objects to be fastened cannot work from both sides. For example, when a screw fastening body is fastened to a hole formed in the wall surface, the work can be performed from the front side of the wall surface, but the work may not be performed from the back surface. In addition, when fastening a screw fastening body to a hole extending in and out of the circumferential surface of a long column steel or pipe steel, the work can be performed from the surface, but the work may not be performed from the inside. In such a case, a so-called one-side bolt that can realize a fastening operation including only the other side by a fastening operation only on one side of the body to be fastened is used.

  Conventional one-side bolts function as a washer on the back side by buckling the easily deformable valve sleeve inserted in the back side of the fastened body in the radial direction by crushing it in the axial direction with the core pin and grip sleeve. Let (Refer nonpatent literature 1).

Lobtex Fastening System Co., Ltd., company web page "Home / Product catalog one → One side bolt → Hack high strength one side bolt", [online], [Search April 29, 2015], Internet <URL http: // www .lobfs.com / pages / p47.html>

  This one-side bolt has a structure in which the axial force at the time of fastening is received by the washer (valve sleeve) because the valve sleeve is crushed into a flat state to function as a washer. Therefore, there is a problem that the fastening is released when the washer is deformed. On the other hand, if the valve sleeve is thickened or a hard material is selected to increase the strength of the washer, there is a problem that it is difficult to buckle in the axial direction.

  The present invention has been made by the inventor's earnest research in view of the above-described problems, and an object thereof is to provide a fastening device capable of increasing the fastening force.

  The present invention that achieves the above-described object includes a sandwiching portion that is disposed on the back side in the axial direction, a first rotating portion and a second rotating portion that are disposed on the near side in the axial direction and are capable of rotating relative to each other, At least one of the first rotation unit and the second rotation unit, the power transmission unit disposed between the first rotation unit and the second rotation unit, and the clamping unit and transmitting axial force, and the first rotation unit and the second rotation unit A back-facing seat portion that is formed and faces the back side; and a back-side engaging portion that has a front-facing seat portion that is sandwiched in the axial direction between the power transmission portion and the sandwiching portion and faces the front side in advance. A screwing part that converts relative rotation of the first rotating part and the second rotating part into relative movement in the axial direction of the clamping part and the power transmission part, and the clamping part and the transmission part. As the force portion approaches in the axial direction, the front-facing seat portion moves radially outward, and the front-facing seat portion moves radially outward from the sandwiching portion and the power transmission portion. Out, utilizing as the hand forward seat the inner facing seat, characterized by engagement with the fastened member, a fastening device.

  In relation to the fastening device, the forward-facing seat portion protrudes radially outward while sliding with respect to the end surface on the axially back side of the power transmission portion.

  In relation to the fastening device, at least one of the front-facing seat portion and the end surface is a tapered surface inclined with respect to a direction perpendicular to the axis.

  In relation to the fastening device, the back side engaging portion has a back side engaging surface that comes into contact with a receiving portion facing the front side in the holding portion, and the back side engaging surface is the holding portion of the holding portion. By sliding with respect to the receiving portion, both the back-side engaging surface and the forward facing seat portion protrude outward in the radial direction.

  In relation to the fastening device, at least one of the back side engaging surface and the receiving portion is a tapered surface inclined with respect to the direction perpendicular to the axis.

  In relation to the fastening device, a plurality of the back side engaging portions are arranged in the circumferential direction, and each of the back side engaging pieces each having the front facing seat portion and the front facing seat portion radially outward. And a protrusion restricting portion that defines a movement limit when moving.

  In relation to the fastening device, the protrusion restricting portion is a connecting portion that connects the plurality of back side engaging pieces in the circumferential direction.

  In relation to the fastening device, the continuous ring portion changes the circumferential distance of the adjacent back side engagement knitting by deforming itself.

  In relation to the fastening device, the back side engaging piece translates radially outward.

  In relation to the fastening device, a shaft portion extending in the axial direction, a male screw portion in which the shaft portion is formed, and the sandwiching portion and the power transmission portion are configured. And an interlocking mechanism that relatively moves the clamping part and the power transmission part in the axial direction, and the clamping part is disposed on the back side in the axial direction of the shaft part and is screwed with the male screw part. The first rotating part is disposed on the near side in the axial direction of the shaft part and is rotated with the shaft part, and the second rotating part is rotated with the power transmission part. It is characterized by doing.

  In relation to the fastening device, the power transmission portion is axially arranged inside the member to be fastened when an axial force exceeding the axial force acting when the front-facing seat portion protrudes radially outward acts. It has the contraction mechanism in which the length of contracts.

  According to the present invention, it is possible to increase the fastening force while maintaining good operability while reducing costs by reducing the number of parts and the number of assembly steps.

In the fastening device which concerns on 1st embodiment of this invention, (A) The top view of the back side engaging part in a diameter-reduced state, (B) The whole front fragmentary sectional view in a diameter-reduced state, (C) In a diameter-expanded state It is a top view of a back side engaging part, (D) Front partial sectional drawing of the whole in a diameter expansion state. (A) a plan view of the back side engaging portion in the reduced diameter state, (B) a front partial sectional view in the vicinity of the back side engaging portion in the reduced diameter state, and (C) in the expanded diameter state according to a modification of the fastening device. It is a top view of a back side engaging part, (D) The front fragmentary sectional view of the back side engaging part vicinity in a diameter-expanded state. (A) a plan view of the back side engaging portion in the reduced diameter state, (B) a front partial sectional view in the vicinity of the back side engaging portion in the reduced diameter state, and (C) in the expanded diameter state according to a modification of the fastening device. It is a top view of a back side engaging part, (D) The front fragmentary sectional view of the back side engaging part vicinity in a diameter-expanded state. (A) a plan view of a back side engaging portion in a reduced diameter state according to a modification of the fastening device, (B) a cross-sectional plan view of the back side engaging portion in a reduced diameter state as seen from the arrow BB in FIG. (C) Front sectional view taken along line CC of (A) in the vicinity of the back side engaging portion in the reduced diameter state, (D) DD arrow in (A) near the back side engaging portion in the reduced diameter state. (E) Plan view of the back side engaging portion in the expanded diameter state, (F) Plan view of the back side engaging portion in the expanded diameter state, taken along the line FF of (G), (G) ) GG arrow front partial cross-sectional view in the vicinity of the back side engaging portion in the expanded diameter state, (H) HH arrow front view in the vicinity of the back side engaging portion in the expanded diameter state. It is a fragmentary sectional view. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is the whole front fragmentary sectional view in the (A) diameter-reduction state which concerns on the modification of the fastening device, (B) The whole front fragmentary sectional view in the diameter-expansion state. (A) Whole front partial sectional view in a reduced diameter state according to a modification of the fastening device, (B) Front sectional view showing only a modification of the power transmission part, (C) Only a modification of the power transmission part is shown. It is front sectional drawing. (A)-(C) Front sectional view showing only power transmission part, (D) Top view, front sectional view and XX arrow plane sectional view showing only power transmission part, according to modification of same fastening device (E) It is the top view which shows only a power transmission part, a front view, and a right view. It is the whole front fragmentary sectional view in the (A) diameter-reduction state which concerns on the modification of the fastening device, (B) The whole front fragmentary sectional view in the diameter-expansion state. It is the whole front fragmentary sectional view in the (A) diameter reduction state which concerns on the fastening device of 2nd embodiment of this invention, (B) The whole front fragmentary sectional view in the diameter expansion state. (A) A cross-sectional plan view taken along line AA of (B) of the interlocking mechanism in the reduced diameter state, (B) Whole front partial cross-sectional view in the reduced diameter state, (C) Enlargement, according to a modification of the fastening device. It is the whole front fragmentary sectional view in a diameter state. (A) Whole front partial sectional view in the reduced diameter state, (B) Whole front partial sectional view in the diameter expanded state before fastening, (C) (A) of the contraction mechanism according to the modification of the fastening device It is a CC arrow cross-sectional top view. It is the whole front fragmentary sectional view in the diameter-expanded state after the fastening based on the modification of the fastening device. It is the whole front fragmentary sectional view in the (A) diameter-reduction state which concerns on the modification of the fastening device, (B) The whole front fragmentary sectional view in the diameter-expansion state. It is the front view in a diameter-reduced state which concerns on the modification of the fastening device, (B) The rear view in a diameter-reduced state, (C) The side view in a diameter-reduced state. It is a perspective view in the diameter-reduced state which concerns on the modification of the fastening device. It is the (A) front view in the diameter-expanded state which concerns on the modification of the fastening device, (B) The rear view in the diameter-expanded state, (C) The side view in the diameter-expanded state. It is a perspective view in the diameter-expanded state which concerns on the modification of the fastening device. It is the (A) perspective view which shows the components of the back side engaging part which concerns on the modification of the fastening device, (B) Top view or bottom view, (C) Side view. It is the front view in a diameter-reduced state which concerns on the modification of the fastening device, (B) The rear view in a diameter-reduced state, (C) The side surface partial sectional view in a diameter-reduced state. It is a perspective view in the diameter-reduced state which concerns on the modification of the fastening device. They are (A) the front view in the diameter-expanded state which concerns on the modification of the fastening device, (B) the rear view in the diameter-expanded state, and (C) the side surface partial sectional view in the diameter-expanded state. It is a perspective view in the diameter-expanded state which concerns on the modification of the fastening device. It is (A) sectional perspective view, (B) perspective view, (C) front view, (D) front sectional view, and (E) bottom view which show the clamping part concerning the modification of the fastening device. (A) perspective view, (B) side view, (C) front view or back view, (D) top view or bottom view, showing parts of the back side engaging portion according to a modification of the fastening device, (E) It is a rear view or a front view. It is (A) top view, (B) side view, (C) front view, (D) perspective view which shows the power transmission part which concerns on the modification of the fastening device. It is the front partial sectional view of the back side engaging part vicinity in the (A) diameter-reduced state which concerns on the modification of the fastening device, (B) The front partial sectional view of the back side engaging part vicinity in the diameter-expanded state. It is (A) perspective view which shows the PCCP shell structure which concerns on the modification of the fastening device, (B) Front view, (C) Top view, (D) Perspective which shows the expansion-contraction tube structure which concerns on the modification of the fastening device (E) Front view, (F) Top view, (G) Perspective view showing these contracted states, (H) and (I) are front views of a power transmission unit to which these structures are applied. (F) is a perspective view according to a modified example of the fastening device.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a fastening device 1 according to the first embodiment. The fastening device 1 includes a shaft portion 5 that extends in the axial direction, a clamping portion 10 that is disposed on the back side in the axial direction of the shaft portion 5, and a first rotating portion 15 that is disposed on the front side in the axial direction of the shaft portion 5. The second rotating unit 20 disposed on the near side and relatively rotated with the first rotating unit 15 and the power transmitting unit disposed on the clamping unit 10 side with respect to the second rotating unit 20 and transmitting axial force 25, and a rear side engaging portion 60 that is clamped in the axial direction between the power transmission portion 25 and the clamping portion 10. In addition, although the case where these components or members are comprised with a metal is illustrated in this 1st embodiment, you may comprise with members other than a metal, and you may comprise combining different materials.

  The first rotation unit 15 is engaged with a tightening tool (not shown) and receives a turning force. For example, in order to engage with the spanner, the outer shape of the first rotating portion 15 is hexagonal, polygonal including convex and concave, or the like. In order to engage with a tightening tool such as a hexagonal wrench, a hole having a shape corresponding to the tightening tool such as a hexagonal hole or a hexagonal wrench is formed on the end surface of the first rotating portion 15. That's fine.

  The second rotating unit 20 is engaged with a tightening tool (not shown) and receives a turning force. There are various methods for engaging with the tightening tool. For example, in order to engage with the spanner, the outer shape of the second rotating portion 20 may be a hexagon.

  Here, the first rotating portion 15 is integrally provided at the front end portion of the shaft portion 5. Accordingly, the first turning portion 15 and the shaft portion 5 are rotated.

  The shaft portion 5 is a columnar member (it is not necessarily a columnar shape and may be a columnar member), and acts on the sandwiching portion 10, the screwing portion 30, the first rotating portion 15, and the like. Transmits axial force. In addition, in this embodiment, the axial part 5 transmits axial force between the clamping part 10 and the screwing part 30 (it mentions later for details) formed in itself. The shaft portion 5 is set longer than the thickness of the fastened member H.

  The clamping part 10 is integrally and coaxially provided at the back end part of the shaft part 5. Therefore, the rotational force of the first rotation part 15 is transmitted to the clamping part 10 via the shaft part 5, and these rotate together.

  The sandwiching portion 10 is a member having an outer shape larger than the diameter of the shaft portion 5, that is, a member that protrudes outward in the radial direction with respect to the shaft portion 5. Specifically, in the present embodiment, the outer shape of the clamping unit 10 is a column, a cylinder, or a cone.

  The clamping part 10 protrudes radially outward with respect to the shaft part 5, thereby forming a receiving part 11 facing the front side. Here, although the receiving part 11 is a conical taper surface, it may be a plane perpendicular to the axial direction.

  A screwing portion 30 is provided between the second rotating portion 20 and the shaft portion 5. Specifically, the screwing part 30 is formed on the inner periphery of the second rotating part 20 and the male screw part formed on the outer periphery at least on the near side of the shaft part 5 and screwed with the female screw part 31. 32. Therefore, the 2nd rotation part 20 becomes a cylindrical internal thread body, and the axial part 5 becomes an external thread body.

  Moreover, the 2nd rotation part 20 has the back direction seat part 21 which opposes a back side (the back side engaging part 60 side). The back-facing seat portion 21 engages with the near-side end surface 27 of the power transmission portion 25 in the axial direction and abuts with the near-side surface of the fastened member H. Note that the back-facing seat portion 21 may be in contact with a washer (not shown), and may be engaged with the power transmission portion 25 and the fastened member H in the axial direction via this washer.

  When the first and second rotating portions 15 and 20 are relatively rotated, the relative rotation is converted into the axial movement of the shaft portion 5 and the second rotating portion 20 by the screwing portion 30. The relative movement between the shaft part 5 and the second rotation part 20 is the relative movement between the clamping part 10 and the power transmission part 25.

  Here, the transmission portion 25 is a substantially cylindrical sleeve member, and the shaft portion 5 is inserted therein. The length of the power transmission part 25 is set to be equal to or greater than the thickness of the fastened member H and is set to be shorter than the shaft part 5. The power transmission unit 25 is disposed between the second rotation unit 20 and the back side engagement unit 60 and transmits an axial force like a so-called refilling rod. Although the case where the 2nd rotation part 20 and the power transmission part 25 are separate bodies is illustrated here, both may be united.

  The maximum outer diameter of the power transmission part 25, the maximum outer diameter of the clamping part 10, and the maximum outer diameter of the rear side engaging part 60 before the diameter expansion are set so as to match or approximate. This is because it is necessary to insert all of these into the hole HP of the fastened member H from the front side.

  The back side engaging part 60 is an annular member, and is a front side seating part 64 facing the front side in the axial direction, and a back side engaging part facing the back side in the axial direction and the receiving part 11 of the clamping part 10. It has a mating surface 66.

  In the rear side engaging portion 60, the front-facing seat portion 64 moves outward in the radial direction due to the axial approach of the sandwiching portion 10 and the power transmitting portion 25, and the front facing seat portion 64 serves as the sandwiching portion 10 and the power transmitting portion. Projects radially outward from 25. Therefore, as shown in FIG. 1C, when the back side engaging portion 60 is viewed from the whole, the diameter is increased.

  As a result, the fastening device 1 can be fastened to the fastened member H using the front-facing seat portion 64 of the sandwiching portion 10 and the back-facing seat portion 21 of the second rotating portion 20. In addition, although the case where the front facing seat portion 64 and the back facing seat portion 21 are brought into direct contact with the fastened member H and fastened is illustrated, the present invention is fastened indirectly through a washer or the like. Including cases.

  The back side engaging portion 60 will be described in more detail.

  The back side engagement surface 66 is a tapered surface inclined with respect to the direction perpendicular to the axis. Accordingly, the axial force is converted into an expanding force toward the outside in the radial direction by pressing the receiving portion 11 and the back engagement surface 66 that are also tapered surfaces in the axial direction.

  The front-facing seat portion 64 abuts on the back end surface 26 on the back side in the axial direction of the power transmission portion 25. The front-facing seat portion 64 moves radially outward while sliding with respect to the back-side end surface 26.

  As a result, when the back side engaging surface 66 slides radially outward with respect to the receiving part 11, the front-facing seat part 64 slides radially outward with respect to the back side end face 26 in conjunction therewith. When both the back-side engaging surface 66 and the front-facing seat portion 64 move outward in the radial direction, they protrude outward in the radial direction from the sandwiching portion 10 and the power transmission portion 25. Since the back side engaging part 60 does not incline at the time of diameter expansion, it can be moved parallel to the outside in the radial direction without changing the axial dimension.

  As shown in FIG. 1A, a plurality of (three in this case) rear side engaging portions 60 are arranged in the circumferential direction, and each has a front facing seat portion 64 and a rear side engaging surface 66. The engagement piece 62 and the protrusion restricting portion 70 that defines a movement limit when the front-facing seat portion 64 moves radially outward are provided.

  The back side engagement piece 62 is a member having a partial arc shape when seen in a plan view, and a plurality of the rear side engagement pieces 62 are arranged in the circumferential direction so as to be substantially cylindrical except for the location of the continuous ring portion 72.

  The protrusion restricting portion 70 serves as a connecting portion 72 that connects the plurality of back side engaging pieces 62 in the circumferential direction. The link portion 72 is a member that can be easily deformed, and the dimension in the link direction, that is, the dimension (distance) in the circumferential direction is variable. Moreover, the upper limit is set to the circumferential direction dimension of the continuous ring part 72, and when the upper limit is reached, the distance does not further increase.

  Specifically, the connecting portion 72 is a thin-walled member that is folded in the circumferential direction by bending so as to reciprocate in the radial direction when the rear side engaging portion 60 in FIG. . Moreover, the continuous ring part 72 connects the outer peripheral side vicinity of the back side engaging part 60 mutually, and is bent toward the radial inside. Therefore, as shown in FIG. 1 (C), when the continuous ring portion 72 is elastically or plastically deformed in the circumferential direction until the upper limit is reached, the distance between the back side engaging pieces 62 adjacent in the circumferential direction increases, The side engaging piece 62 translates radially outward while maintaining the axial direction. When the continuous ring portion 72 is fully extended, the movement of the back side engagement piece 62 stops.

  As shown in FIG. 1 (D), when the first and second rotating portions 15 and 20 are relatively rotated and the fastened member H is fastened, the reaction force is a front facing seat of the back side engaging piece 62. It is transmitted to the receiving part 11 of the clamping part 10 via the part 64. As a result, each of the rear side engaging pieces 62 tries to move further outward in the radial direction, but further movement is restricted by the tension of the continuous ring portion 72, and the reaction force can be received.

  In the present embodiment, the case where the thin-walled continuous portion 72 is bent in the radial direction is exemplified in the plan view, but the thin-walled continuous portion 72 is bent in the axial direction and folded in the circumferential direction. You can also.

  According to the fastening device 1 of the present embodiment, since it is not necessary to buckle in the axial direction unlike a conventional valve sleeve (corresponding to the back side engaging portion), the back side engaging piece 62 is arranged in the radial direction and the shaft. Can be thick in the direction. Further, since the forward facing seat portion 64 of the back side engagement piece 62 can be moved as it is in the radial direction and the reaction force of the fastened member H can be received by the forward facing seat portion 64, the rigidity is enhanced. The fastening force can be increased.

  In particular, in the back side engaging part 60 of this embodiment, since the back side engaging piece 62 side is not elastically or plastically deformed by exclusively arranging the continuous ring part 72 that is deformed when the diameter is expanded, the wall thickness is further increased. Design becomes possible. Since the connecting portion 72 can be easily deformed, the burden on the operator when fastening is reduced.

  Further, if the continuous ring portion 72 is an elastic member that can be restored after deformation, it is possible to return to the reduced diameter state by separating the clamping portion 10 and the power transmission portion 55 after fastening, and the fastening device 1 It can be easily taken out from the fastened body H.

  Although the back side engaging part 60 of the said embodiment illustrated the case where the back side engaging piece 62 and the protrusion control part 70 (continuous ring part 72) were formed integrally, this invention is not limited to this, For example, As shown in FIG. 2, it is possible to combine different members. In this case, the rear engagement piece 62 may be made of a metal material whose surface hardness is increased by quenching or the like, and the continuous ring portion 72 may be made of a normal metal material or a metal material that can be easily elastically deformed. Of course, resin materials other than metals may be combined.

  Although the back side engaging part 60 of the said embodiment illustrated the case where the three back side engaging pieces 62 are arrange | positioned, the number is not specifically limited, For example, as shown in FIG. You may arrange | position above. Two may be sufficient. Moreover, although the continuous ring part 72 of the back side engaging part 60 of the said embodiment illustrated the case where the outer peripheral side vicinity of the back side engaging part 60 was mutually connected, as shown in FIG. It is also preferable that the vicinity of the inner peripheral side of the side engaging portion 60 is connected to each other and bent outward in the radial direction. If it does in this way, the movement distance to the radial direction outer side engagement piece 62 by expansion | extension of the continuous ring part 72 can be enlarged.

  The back side engaging part 60 of the said embodiment illustrates the case where it is comprised so that the front facing seat part 64 and the back side engaging surface 66 of the back side engaging piece 62 may not exist in the place where the continuous ring part 72 exists. However, the present invention is not limited to this. For example, as shown in FIG. 4, in the back side engaging piece 62, the vicinity of the front facing seat portion 64 and / or the back side engaging surface 66 can be expanded in the circumferential direction. That is, you may arrange | position so that the continuous ring part 72 and the front facing seat part 64 and / or the back side engaging surface 66 may overlap in an axial direction. If it does in this way, it will become possible to enlarge the area of the front facing seat part 64 and / or the back side engaging surface 66.

  The fastening device 1 of the above embodiment has a structure that receives the reaction force of the fastened member H by the tapered surfaces of the receiving portion 11 and the back-side engagement surface 66 in the diameter-expanded state of FIGS. 1 (C) and 1 (D). Although illustrated, this invention is not limited to this. For example, as shown in FIG. 5, the receiving portion 11 includes a first receiving portion 11 a that is a tapered surface on the inner peripheral side, and a second flat surface that is disposed on the outer peripheral side of the first receiving portion 11 a and extends in the direction perpendicular to the axis. A two-stage structure including the receiving portion 11b is adopted. Moreover, the back side engaging surface 66 is a first back side engaging surface 66a that is a tapered surface on the outer peripheral side, and a plane that is disposed on the inner peripheral side of the first back side engaging surface 66a and extends in the direction perpendicular to the axis. A two-stage structure including a second back side engagement surface 66b. If it does in this way, at the time of diameter reduction of FIG. 5 (A), the 1st receiving part 11a and the 1st back side engagement surface 66a will contact | abut, and axial force will be converted into expansion force by a taper structure, and back side engagement will be carried out. The diameter of the part 60 is expanded. At the end of the diameter expansion, as shown in FIG. 5B, the contact between the first receiving portion 11a and the first back side engagement surface 66a is released, and the second receiving portion 11b and the second back side engagement are released. The surface 66b abuts to complete the movement of the back side engagement piece 62 in the radial direction. Therefore, the second receiving portion 11b and the second back side engaging surface 66b can be defined as a part of the protrusion restricting portion 70 in the present invention.

  Further, the second receiving portion 11b and the second back side engaging surface 66b can receive the axial reaction force from the fastened member H on a vertical plane. At the same time, since the tension acting on the continuous ring portion 72 can be reduced or released in the expanded diameter state, fatigue of the continuous ring portion 72 can be suppressed. In addition, although the case where the receiving part 11 and the back side engaging surface 66 are made into a two-step structure was illustrated here, for example, when making the back side end surface 26 and the front facing seat part 64 into a taper structure, this is made into two steps. A structure is also possible.

  Further, as shown in FIG. 6, step portions 11 c and 66 c that are engaged with each other in the radial direction when the diameter expansion operation is completed (in the diameter expansion state) can be formed on the receiving portion 11 and the back side engagement surface 66. . Similarly, the back end face 26 and the forward facing seat portion 64 can be formed with step portions 26c and 64c that are engaged with each other in the radial direction when the diameter expansion operation is completed. Since these step portions can restrict the movement of the back side engagement piece 62 in the radial direction, these step portions can also be defined as a part of the protrusion restricting portion 70 in the present invention. .

  In the present embodiment, the front-facing seat portion 64 and the back-side end surface 26 are configured as a plane parallel to the direction perpendicular to the axis, but the present invention is not limited to this. For example, as shown in FIG. 7, it is also preferable to convert the axial pressing force into an expansion force that moves the front-facing seat portion 64 radially outward by using the front-facing seat portion 64 and the back end surface 26 as tapered surfaces. .

  In the present embodiment, the case where the front-facing seat portion 64 and a part of the back end surface 26 abut each other in the expanded diameter state of FIGS. 1C and 1D is illustrated, but the present invention is not limited to this. . For example, as shown in FIG. 8B, in the diameter-expanded state, the contact between the front facing seat portion 64 and the back side end surface 26 is released, and the back side end surface 26 of the power transmission unit 25 is connected to the back side. It is also preferable to enter the inner peripheral side of the joint portion 60. If it does in this way, since the transmission part 25 can ensure the fastening amount (tightening amount) by the back side engaging part 60 and the 2nd rotation part 20 only the distance T which can approach in the back side engaging part 60. Thus, it becomes possible to flexibly cope with a change in the thickness of the fastened member H.

  In this embodiment, although the case where the axial direction length of the power transmission part 25 was constant was illustrated, this invention is not limited to this, The length of the power transmission part 25 is the inside of the hole HP of the to-be-fastened member H. It is preferable to employ a shrinkage structure that can be shrunk with a. For example, as shown in FIG. 9 (A), the power transmission part 25 includes a cylindrical thin part 25A that approaches the outer peripheral surface of the shaft part 5, and a rear end face 26 and a front side formed in a flange shape at both ends thereof. An end face 27 may be provided. Thereby, since the margin clearance S can be ensured between the power transmission portion 25 and the hole HP of the fastened member H, the thin portion 25A is deformed in the radial direction in the margin clearance S, and the axial dimension is reduced. It becomes possible to shorten. As a result, since the fastening amount by the back side engaging part 60 and the 2nd rotation part 20 is securable, it becomes possible to respond flexibly to the thickness change of the to-be-fastened member H. Here, the thin-walled portion 25A has a cylindrical shape, but a plurality of rod-like members extending in the axial direction may have a bowl shape arranged in the circumferential direction.

  9B, the thin portion 25A may be brought closer to the hole HP side of the fastened member H, and one end portion of the thin portion 25A may be used as shown in FIG. 9C. Can be in the shape of a slanted cylinder so that the end HP approaches the hole HP of the fastened member H and the other end approaches the outer peripheral surface of the shaft portion 5. As shown in FIG. 10 (A), both end portions of the thin portion 25 </ b> A may approach the hole HP of the fastened member H, and the center side may have a curved cylindrical shape that approaches the outer peripheral surface of the shaft portion 5. As shown in FIG. 10 (B), both ends of the thin portion 25A approach the outer peripheral surface of the shaft portion 5, and the center side may have a curved cylindrical shape approaching the hole HP of the fastened member H. it can. As shown in FIG. 10C, a certain range from both ends of the thin portion 25A toward the center approaches the hole HP of the fastened member H, and the center side except these approaches the outer peripheral surface of the shaft portion 5. It can also be set as a curved shape.

  Further, as shown in FIG. 10D, the thin portion 25A may have a cylindrical structure having a non-circular cross section. For example, the cross-sectional shape can be a star shape, a polygonal shape, a sawtooth shape continuous in the circumferential direction, a jagged shape, a zigzag shape, or a wave shape. If it does in this way, end face itself of thin part 25A can be used as back end face 26 and near side end face 27. At this time, by forming the opening 25D in the middle of the thin portion 25A, the fragile region 25E that is easily buckled or deformed in the axial direction can be formed.

  As shown in FIG. 10 (E), the power transmission portion 25 is formed by laminating wave ring pieces in which a ring-shaped member is formed in a wave shape in multiple stages in the axial direction, or by winding a wire while spirally winding a wire. It can also be a so-called wave spring configured by stacking in a shape. If it does in this way, it can expand and contract by elastically deforming in the axial direction. A so-called coil spring may be used instead of the wave spring.

  9 and 10, the axial force required when the rear side engaging portion 60 expands in diameter prevents the power transmission portion 25 from contracting in the axial direction, and the axial force larger than that. When (that is, the axial force at the time of fastening) is applied, it is positively shrunk.

  Furthermore, as shown in FIG. 11, as a contraction structure of the power transmission section 25, a cylindrical first power transmission piece 28A located on the back side and a cylindrical second power transmission piece 28B located on the near side are provided. Thus, a structure in which the first power transmission piece 28A and the second power transmission piece 28B are slid in the axial direction is also preferable. Here, the outer diameter of the second power transmission piece 28B is set smaller than the inner diameter of the first power transmission piece 28A, and the second power transmission piece 28B enters inside the first power transmission piece 28A. The entire length of the power transmission unit 25 is contracted.

  As shown in FIG. 11 (A), the shearing part (sher washer) 29 is fixed to the outer periphery of the second power transmission piece 28B, and the power transmission part 25 is longest before the first power transmission piece 28A. The side end portion comes into contact with the shearing portion 29. When an external force is applied in a direction in which the power transmission portion 25 is contracted in the axial direction, the shearing portion 28 is sheared as shown in FIG. 11B, and the second power transmission piece is placed inside the first power transmission piece 28A. 28B enters, and the entire length of the transmission portion 25 is shortened. Particularly in this example, both the first power transmission piece 28A and the second power transmission piece 28B are set to have an outer diameter smaller than the hole HP of the fastened member H, and both are inserted into the hole HP. Further, the outer diameter of the shearing portion 29 is also set smaller than the hole HP (or set to be equal to or smaller than the maximum outer diameter of the power transmission portion 25), and is arranged near the center of the power transmission portion 25 in the axial direction. Sometimes it is located in the hole HP.

  If it does in this way, the distance (shrinkage distance) M which the 1st power transmission piece 28A and the 2nd power transmission piece 28B slide will be 1/4 or more of the full length of the power transmission part 25, Preferably it is 1/3 or more. It becomes possible to. As a result, the single fastening device 1 can flexibly cope with the thickness variation of the fastened member H. Specifically, the variation allowable amount Ex of the thickness E of the member to be fastened can be 0.2 L or more with respect to the total axial length L of the fastening device 1, preferably 0.3 L or more, and more desirably. Can be 0.4 L or more. In addition, the maximum value that can be selected by the thickness E at this time can be 0.7 L or more, and more desirably 0.8 L or more. In other words, it is possible to flexibly cope with the thickness variation of the fastened member H while the entire length of the fastening device 1 is configured to be compact.

  Also, as shown in FIG. 12, the diameter of the second power transmission piece 28B arranged on the front side is set larger than the hole HP, and this second power transmission piece 28B is arranged on the front side of the fastened member H. In addition, the second rotating unit 20 may function as a seat (washer). In this case, the front end of the first power transmission piece 28A is caused to enter the inner peripheral side of the second power transmission piece 28B, thereby reducing the total length of the power transmission part 25 (FIG. 12B). reference).

  11 and 12, the axial force when the shearing portion 29 shears is set to be larger than the axial force required when the rear side engaging portion 60 expands in diameter. That is, until the inner side engagement portion 60 is expanded in diameter, the transmission portion 25 is prevented from contracting in the axial direction, and if a larger axial force (that is, an axial force during fastening) is applied, the shearing portion 29 is It breaks positively and the power transmission part 25 shrinks.

  Next, the fastening device 1 according to the second embodiment will be described with reference to FIG. In addition, about what has a function in common with the components, members, etc. of the fastening device shown in the first embodiment, the description and illustration are appropriately omitted by matching the names and / or symbols in the second embodiment, The differences are mainly explained.

  In the fastening device 1, a screwing portion 30 is formed between the shaft portion 5 and the clamping portion 10. Specifically, the screw part 30 includes an internal thread part 31 formed on the inner periphery of the clamping part 10 and an external thread part 32 formed on the outer periphery at least on the back side of the shaft part 5 and screwed with the internal thread part 31. It is prepared for. Therefore, the clamping part 10 becomes a cylindrical internal thread body, and the axial part 5 becomes an external thread body.

  Between the clamping part 10 and the power transmission part 25, while the clamping part 10 and the power transmission part 25 are rotated, the interlocking mechanism 90 which relatively moves this clamping part 10 and the power transmission part 25 to an axial direction is comprised. . The interlocking mechanism 90 includes an interlocking sleeve 92 that is provided in the sandwiching portion 10 and extends in the axial direction on the inner side of the back side engaging portion 60, and a sleeve accommodation hole 94 that is provided in the power transmission portion 25 and accommodates the interlocking sleeve 92. Have. As shown in FIG. 13A, grooves or line-shaped protrusions extending in the axial direction and engaging with each other in the circumferential direction are formed on the outer circumferential surface of the interlocking sleeve 92 and the inner circumferential surface of the sleeve receiving hole 94 in the circumferential direction. More than one series, preferably a plurality are formed. Therefore, the interlocking sleeve 92 and the sleeve receiving hole 94 are slidable in the axial direction and engage in the circumferential direction. Although not particularly shown here, it is also possible to form the sleeve accommodation hole 94 in the back side engaging portion 60 and form the interlocking sleeve 92 in the power transmission portion 25.

  The 2nd rotation part 20 rotates together by integrating with the power transmission part 25. FIG. Therefore, when the second rotation unit 20 is rotated, the clamping unit 10 is rotated via the power transmission unit 25 and the interlocking mechanism 90.

  The first rotation unit 15 and the second rotation unit 20 rotate relative to each other and engage in the axial direction. In the present embodiment, the front side end face 22 of the second rotating portion 20 and the back seat portion 16 of the first rotating portion 15 are engaged in the axial direction.

  When the first rotating unit 15 and the second rotating unit 20 are relatively rotated in the reduced diameter state of FIGS. 13A and 13B, the fastening device 1 together with the first rotating unit 15 has the shaft portion 5. Rotates, and the clamping unit 10 rotates together with the second rotation unit 20. As a result, as shown in FIG. 13C, the screwing portion 30 between the shaft portion 5 and the pinching portion 10 moves the pinching portion 10 toward the near side, thereby expanding the diameter of the back side engaging portion 60. Can do. Therefore, even after the fastening, the shaft portion 5 does not protrude toward the front side, so that it does not get in the way.

  Also in the fastening device 1 of the second embodiment, as shown in FIGS. 14 and 15, a contraction structure is employed in which the length of the transmission portion 25 can be contracted inside the hole HP of the fastened member H. It is preferable. As the contraction structure, for example, a cylindrical first power transmission piece 28A located on the back side and a cylindrical second power transmission piece 28B located on the near side are provided, and the first power transmission piece 28A and the first power transmission piece 28A The two power transmission pieces 28B are engaged in the circumferential direction while sliding in the axial direction. At this time, the inner diameter of the second power transmission piece 28B is set larger than the outer diameter of the first power transmission piece 28A, and the second power transmission piece 28B enters the outside of the first power transmission piece 28A. The entire length of the force portion 25 is contracted. As shown in FIG. 14C, a groove or a row of protrusions extending in the axial direction and engaging in the circumferential direction is provided between the outer periphery of the first power transmission piece 28A and the inner periphery of the second power transmission piece 28B. By forming a plurality in the circumferential direction, the rotation of the second rotation unit 20 can be transmitted to the clamping unit 10.

  The shearing part (shear washer) 29 is fixed to the outer periphery of the first power transmission piece 28 </ b> A. When the power transmission part 25 is the longest, the rear end of the second power transmission piece 28 </ b> B contacts the shearing part 29. Touch. As shown in FIG. 14 (B), after the clamping part 10 is moved to the near side and the rear side engaging part 60 is expanded in diameter, an external force is applied so as to further shrink the power transmission part 25 in the axial direction. Then, as shown in FIG. 15, the shearing portion 29 is sheared, the second power transmission piece 28B enters the outside of the first power transmission piece 28A, and the total length of the power transmission portion 25 is shortened. Particularly in this example, both the first power transmission piece 28A and the second power transmission piece 28B are set to have an outer diameter smaller than the hole HP of the fastened member H, and both are inserted into the hole HP. Further, the outer diameter of the shearing portion 29 is also set smaller than the hole HP (or set to be equal to or smaller than the maximum outer diameter of the power transmission portion 25), and is arranged near the center of the power transmission portion 25 in the axial direction. Sometimes it is located in the hole HP.

  In the fastening device 1 according to the first and second embodiments, the front facing seat portion 64 of the back side engaging portion 60 moves outward in the radial direction and directly contacts the back side surface of the fastened member H. Although illustrated, this invention is not limited to this. For example, as shown in FIG. 16A, a deformable sleeve 80 that can be easily buckled toward the outside in the radial direction can be disposed between the back side engaging portion 60 and the power transmitting portion 25. The buckling load in the axial direction of the deformation sleeve 80 is preferably set smaller than the diameter expansion load of the back side engaging portion 60.

  As shown in FIG. 16B, when the clamping unit 10 and the power transmission unit 25 are brought close to each other, the deformable sleeve 80 is first buckled to form a so-called washer. After the buckling is completed, when the clamping portion 10 and the power transmission portion 25 are brought closer to each other with a stronger force, the rear side engagement portion 60 is expanded in diameter, and the front-facing seat portion 64 is engaged with the fastened member H in the axial direction. Move to the matching position. If it does in this way, it becomes possible to arrange | position a washer (deformation sleeve 80) between the front-facing seat part 64 and the to-be-fastened member H, and it becomes possible to raise fastening force further.

  At this time, in the deformable sleeve 80, the buckling region 82 located in the center in the axial direction is made of a soft material (for example, a metal raw material), and the portion that receives the front-facing seat 64 after the buckling is completed, that is, the buckling region 82. The non-buckling regions 84 on both axial outer sides are preferably made of a hard material (for example, hardened steel). While making the deformation easy, the strength or rigidity after the deformation can be increased.

  Furthermore, in 1st embodiment, the receiving part 11 of the clamping part 10 and the back side engaging surface 66 of the back side engaging part 60 are made into a taper surface, and the back side engaging part 60 is utilized using this taper surface. Although the case where it moved to the radial direction outer side was illustrated, this invention is not limited to this.

  For example, as shown in FIGS. 17 and 18, the back side engaging portion 60 has a first back side engaging piece 660 disposed on the near side and a second back side engaging piece 680 disposed on the back side. You may make it provide.

  As shown in FIG. 21, the first back-side engagement piece 660 and the second back-side engagement piece 680 have a common shape, and have through holes 661 and 681 extending in the axial direction, respectively. When viewed from the axial direction, the holes 661 and 681 have a long hole shape extending in the radial direction. In FIG. 21, the first back side engagement piece 660 has a posture reversed in the axial direction and the diameter direction.

  The first back side engaging piece 660 and the second back side engaging piece 680 are slidable in the radial direction by the length of the oval hole in a state where the shaft portion (not shown) is passed through the through holes 661 and 681. It has become. Further, the first back side engagement piece 660 and the second back side engagement piece 680 have contact surfaces 663 and 683 that contact (oppose) each other, and the contact surfaces 663 and 683 pass through. The holes 661 and 681 are inclined in the long hole direction.

  Returning to FIG. 17, the first back-side engagement piece 660 and the second back-side engagement piece 680 have a common shape, but are in an axially inverted state and a diametrically inverted state, that is, a contact surface. 663 and 683 are arranged in a point-symmetric state so as to face each other. As a result, the back side engaging surface 66 of the back side engaging portion 60 and the forward facing seat portion 64 are parallel to the direction perpendicular to the axis, and the contact surfaces 663 and 683 are inclined.

  Accordingly, as shown in FIGS. 19 and 20, when the clamping force is applied to the contact surfaces 663 and 683 by bringing the clamping unit 10 and the power transmission unit 25 closer, the first back side engagement piece 660 is moved. It moves to one side in the diameter direction, and the second back side engagement piece 680 moves to the other side in the diameter direction. That is, the first back side engagement piece 660 and the second back side engagement piece 680 are separated from each other in the diametrical direction. As a result, the front-facing seat portions 64 respectively formed on the first back-side engagement piece 660 and the second back-side engagement piece 680 move outward in the radial direction and protrude from the power transmission portion 25. As described above, it is also preferable that the back side engaging portion 60 is constituted by a plurality of members and the plurality of members are separated outward in the radial direction by disposing a tapered surface inside.

  In addition, in a state where no external force is applied to the contact surfaces (tapered surfaces) 663 and 683, the first back side engagement piece 660 and the second back side engagement piece 680 are prevented from moving in the radial direction due to vibration or dead weight. For this purpose, a winding member such as a rubber ring is arranged around these members, the contact surfaces (tapered surfaces) 663 and 683 are temporarily fixed with an adhesive, the first back side engagement piece 660 and the second It is also preferable to attract the back side engagement piece 680 by magnetic force. When a restricting member such as a rubber ring is disposed, the first back side engaging piece 660 can be moved in a direction opposite to the tightening direction by rotating the relative rotating direction of the first rotating member 15 and the second rotating member 20. The second back side engagement piece 680 can be returned to the original coaxial position, and therefore the fastening device 1 that is in the fastening body with respect to the fastened member H can be detached from the fastened member H. Become.

  17 to 21 exemplify the case where the back side engaging portion 60 is disposed in a state in which it can be relatively rotated in the circumferential direction with respect to the sandwiching portion 10 and the power transmitting portion 25. However, the present invention is not limited to this.

  For example, as a modification of FIG. 13 of the first embodiment, as shown in FIGS. 22 and 28, the oval direction of the through holes 661 and 681 (the diameter of the shaft portion 5) with respect to the receiving portion 11 in the clamping portion 10. ) In the diameter direction of the shaft portion 5 with respect to the respective back side engaging surfaces 66 of the first back side engaging piece 660 and the second back side engaging piece 680. Extending engaging piece guide irregularities 664 and 684 are formed, and the receiving portion guide unevenness 11x and the engaging piece guide irregularities 664 and 684 can be slidable in the diameter direction and engaged in the circumferential direction. If it does in this way, since the 1st back side engaging piece 660 and the 2nd back side engaging piece 680 engage with the receiving part 11 in the circumferential direction, this back side engaging part 60 is the clamping part 10. Rotational power can be transmitted.

  Further, the inner guide irregularities 663a, 683a extending in the same direction as the engagement piece guide irregularities 664, 685 with respect to the contact surfaces 663, 683 of the first rear side engagement piece 660 and the second rear side engagement piece 680, respectively. , And the internal guide irregularities 663a and 683a can be slidable in the diametrical direction and engaged in the circumferential direction. In this case, the first back side engaging piece 660 and the second back side engaging piece 680 are slidable in the diametrical direction and engaged in the circumferential direction. Rotational power can be transmitted between the back side engaging pieces 680.

  Further, a seat guide irregularity 64x is formed on the front-facing seat portion 64 of the first back-side engagement piece 660 and the second back-side engagement piece 680, and the back-side end surface 26 of the power transmission portion 25 is formed. On the other hand, it is possible to form the power guide guiding unevenness 26x extending in the diametrical direction, and to allow the seat guide guiding unevenness 64x and the power transmitting portion guide unevenness 26x to be slidable in the diameter direction and engaged in the circumferential direction. it can. If it does in this way, since the 1st back side engagement piece 660 and the 2nd back side engagement piece 680 engage with the power transmission part 25 in the circumferential direction, the power transmission part 25 will be the back side engagement part. Rotational power can be transmitted to 60. With the above configuration, as shown in FIG. 23, the rotational force of the power transmission unit 25 can be transmitted to the clamping unit 10 via the back side engagement unit 60, so that it also serves as the interlocking mechanism 90 shown in the first embodiment ( Can be omitted).

  As shown in FIGS. 24 and 25, when the holding portion 10 and the power transmission portion 25 are brought close to each other and the holding force is applied to the contact surfaces 663 and 683, the power transmission portion guide unevenness 26 x and the seat portion guide unevenness are obtained. 64x, inner guide unevennesses 663a and 683a, engagement piece guide unevennesses 664 and 684, and receiving portion guide unevenness 11x while being guided in the diameter direction, the first back side engagement piece 660 and the second back side engagement piece 680 Are diametrically separated from each other. As a result, the front-facing seat portions 64 respectively formed on the first back-side engagement piece 660 and the second back-side engagement piece 680 move outward in the radial direction and protrude from the power transmission portion 25.

  In the modification, the two first back side engagement pieces 660 and the second back side engagement pieces 680 are engaged in the diameter direction while being engaged with the transmission portion 25 and the sandwiching portion 10 in the circumferential direction. Although the case where they are separated is illustrated, the present invention is not limited to this. For example, the front-facing seat portion 64 of each back-side engagement piece 62 of the back-side engagement portion 60 shown in FIG. A guide unevenness extending in the radial direction is formed on the rear engagement surface 66, and the guide unevenness is engaged with the guide unevenness formed in the same direction with respect to the power transmission portion 25 and the receiving portion 11. You may make it let it. That is, the back side engaging portion 60 may transmit the rotational force of the power transmission portion 25 to the clamping portion 10 by forming guide irregularities radially on the mutual contact surfaces.

  In addition, as the shape of the guide unevenness that is slidable in the radial direction and engaged in the circumferential direction, various modes such as a sawtooth shape in cross section, a rectangular shape in cross section, and dovetail grooves that cannot be separated from each other can be selected.

  Further, in the first to second embodiments, the case where the back side engagement portion 60 is mainly arranged in the axial direction is exemplified, but for example, as shown in FIG. 29, the back side engagement portion 60 is set in the axial direction. A plurality of multi-stage back side engagement pieces 690A, 690B, and 690C are provided, and the back side engagement pieces 690A, 690B, and 690C are radially outwardly contracted while being axially contracted by a nested structure or a telescopic structure. Expansion is also preferred. If the back side engagement pieces 690A, 690B, 690C are engaged in the axial direction in the expanded state, only the innermost back side engagement piece 690C is sandwiched between the holding part 10 and the power transmission part 25. The inner side engagement piece 690A disposed on the outermost side can be held in the axial direction. As a result, the moving amount in the radial direction of the back side engaging piece 690A arranged on the outermost side can be set large.

  Next, another modification of the fastening device of the first or second embodiment will be described.

  30A to 30C show an axial contraction structure or a radial expansion structure applicable to the power transmission section 25 (or the back side engagement section 60). This contraction or expansion structure is a so-called PCCP shell (Pseudo-Cylindrical Concave Polyhedral Shell) structure P in which trusses (triangular skeleton structures) are three-dimensionally combined. A portion (bottom portion) that protrudes radially outward and contacts the bottoms extending in the direction perpendicular to the axis is recessed radially inward. A portion where the oblique sides of the triangle are in contact with each other (the transition portion) connects the apex portion and the bottom portion. With this polyhedron, a pseudo cylinder can be formed. The PCCP shell structure P can be contracted (deformed) in the axial direction, and at that time, the apex portion protrudes radially outward. You may apply this PCCP shell structure P to the power transmission part 25 (or back side engaging part 60). Therefore, in the plane of the triangle, a region having high strength and difficult to deform is formed, and each side or each vertex of the triangle can constitute a region that can be easily deformed by a fold.

  30D to 30F show an axial contraction structure or a radial expansion structure applicable to the power transmission section 25 (or the back side engagement section 60). This contraction or expansion structure is a telescopic tube structure D in which a truss (skeleton structure) using a trapezoid is three-dimensionally combined, and a portion (short side portion) where the short sides of the trapezoid extending in the direction perpendicular to the axis intersect. A portion (long side portion) that protrudes radially outward and contacts long sides extending in the direction perpendicular to the axis is recessed radially inward. The part (transition part) where the oblique sides contact each other connects the short side part and the long side part. With this polyhedron, a pseudo cylinder can be formed. The telescopic tube structure D can be contracted (deformed) in the axial direction, and at that time, the short side portion projects outward in the radial direction. You may apply this expansion-contraction pipe structure D to the power transmission part 25 (or back side engaging part 60). Accordingly, the trapezoidal plane is a region that is strong and difficult to deform (hard deformation region), and each side or each vertex of the trapezoid forms a region that can be easily deformed by a fold (easy deformation region). Is possible. It is also possible to use a parallelogram instead of the trapezoid. For reference, FIG. 30G shows a state in which this type of PCCP shell structure or telescopic tube structure is contracted in the axial direction. In general, the telescopic tube structure D can be more easily deformed in the axial direction than the PCCP shell structure P.

  FIG. 30H is an example in which both the PCCS shell structure P and the telescopic tube structure D are applied to the power transmission unit 15. In this case, the telescopic tube structure D shrinks preferentially. FIG. 30I is an example in which the telescopic tube structure D is applied to a part of the power transmission section 25, and the remaining portion is a straight cross-sectional polygonal cylinder. Note that a constriction is formed at the boundary between the power transmission portion 25 and the rear side engagement portion 60.

  FIG. 30J is an example in which five or more back side engagement pieces 62 are arranged in the circumferential direction in the back side engagement part 60 and the continuous ring part 72 is arranged therebetween.

  As described above, the present invention can take various configurations, and is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Fastening device 5 Shaft part 10 Clamping part 11 Receiving part 11a First receiving part 11b Second receiving part 11c Step part 15 First turning part 16 Backward facing seat part 20 Second turning part 21 Backward facing seat part 22 Front side End face 25 Power transmission part 25A Thin part 25D Opening 25E Fragile area 26 Back side end face 26c Step part 27 Front side end face 28A First power transmission piece 28B Second power transmission piece 29 Shearing part 30 Screwing part 60 Back side engagement part 62 Back side engagement piece 64 Seat portion 66 Back side engagement surface 66a First back side engagement surface 66b Second back side engagement surface 70 Protrusion restricting portion 72 Interlocking portion 80 Deformation sleeve 82 Buckling region 84 Non-buckling region 90 Interlocking mechanism 92 Interlocking sleeve 94 Sleeve receiving hole H Fastened member HP hole

Claims (11)

A clamping part arranged on the back side in the axial direction;
A first rotating part and a second rotating part which are arranged on the near side in the axial direction and are rotatable relative to each other;
A power transmission unit disposed between the first rotation unit and the second rotation unit and the clamping unit to transmit axial force;
A back-facing seat portion formed on at least one of the first rotating portion and the second rotating portion and facing the back side;
A rear side engaging portion having a front facing seat portion that is sandwiched in the axial direction between the power transmission portion and the sandwiching portion and faces the front side in advance;
A threaded portion that converts relative rotation of the first rotating portion and the second rotating portion into relative movement in the axial direction of the clamping portion and the power transmitting portion;
Due to the axial approach of the sandwiching part and the power transmission part, the front facing seat part moves outward in the radial direction, and the front seat part protrudes radially outward from the sandwiching part and the power transmission part. ,
Utilizing the front-facing seat and the back-facing seat, it engages with a fastened member,
Fastening device. The front-facing seat portion protrudes radially outward while sliding with respect to the end surface on the axially back side in the power transmission portion,
The fastening device according to claim 1. At least one of the front-facing seat portion and the end surface is a tapered surface inclined with respect to the direction perpendicular to the axis,
The fastening device according to claim 2. The back side engaging part has a back side engaging surface that comes into contact with the receiving part facing the near side in the clamping part,
The back side engaging surface slides with respect to the receiving part of the clamping part, so that both the back side engaging surface and the front facing seat part protrude radially outward.
The fastening device according to any one of claims 1 to 3. At least one of the back side engagement surface and the receiving portion is a tapered surface inclined with respect to a direction perpendicular to the axis,
The fastening device according to claim 4. The back side engaging portion is
A plurality of circumferentially arranged rear engagement pieces each having the front-facing seat portion;
A protrusion restricting portion that defines a movement limit when the forward facing seat portion moves radially outward; and
It is characterized by having
The fastening device according to any one of claims 1 to 5. The protrusion restricting portion is a connecting portion that connects the plurality of back side engaging pieces in the circumferential direction.
The fastening device according to claim 6. The continuous ring portion changes a circumferential distance of the adjacent back side engagement knitting by deforming itself,
The fastening device according to claim 7. The back engagement piece translates radially outward,
The fastening device according to any one of claims 6 to 8. An axial portion extending in the axial direction;
A male screw portion formed with the shaft portion;
An interlocking mechanism configured between the sandwiching portion and the power transmission portion, rotating the sandwiching portion and the power transmission portion, and relatively moving the sandwiching portion and the power transmission portion in the axial direction;
The clamping portion has a female screw portion that is arranged on the inner side in the axial direction of the shaft portion and is screwed with the male screw portion,
The first rotating portion is arranged on the near side in the axial direction of the shaft portion and is rotated with the shaft portion,
The second rotating part is arranged with the power transmission part,
The fastening device according to any one of claims 1 to 9. The power transmission portion is a contraction mechanism in which the axial length contracts inside the fastened member when an axial force exceeding the axial force acting when the front-facing seat portion protrudes radially outward is applied. It is characterized by having
The fastening device according to any one of claims 1 to 10.

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