JP2016217395A - Fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strengthen fastening force and to reduce worker's burden in a fastening device such as a one side bolt and the like.SOLUTION: A fastening device 1 has a power transmission portion 25 disposed between a first rotary portion and a second rotary portion 15, 20 and a holding portion 10 for transmitting axial force, a depth-direction seat portion 21 opposed to a depth side, a depth-side engagement portion 60 axially held between the power transmission portion 25 and the holding portion 10, and a screwing portion 30 for converting into axial relative movement of the holding portion 10 and the power transmission portion 25. The depth-side engagement portion 60 has an easily deformable region 620 easily deformed by external force, and a hardly deformable region 640 hardly deformed by the external force in comparison with the easily deformable region 620. The hardly deformable region 640 is projected radially outward and forms a front-direction seat portion opposed to a front side by deformation of the easily deformable region 620 by axial approach of the holding portion 10 and the power transmission portion 25, and is engaged with a fastened member by utilizing the front-direction seat portion 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. (See Non-Patent Document 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>

  The conventional 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 problems, and provides a fastening device that can tighten the fastening force and at the same time reduce the burden on the operator. Objective.

  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, a back-side engaging portion that is held in the axial direction between the power transmission portion and the holding portion, the first turning portion, and the second turning portion A screwing portion that converts the relative rotation of the pinching portion and the power transmission portion into the axial relative movement, and the back side engagement portion is easily deformable with respect to external force. The region and a hard deformation region that is harder to deform than the easy deformation region with respect to the external force, and by causing the clamping portion and the power transmission portion to approach in the axial direction, By deforming the easily deformable region of the side engaging portion, at least the hardly deformable region protrudes radially outward from the sandwiching portion and the power transmitting portion to form a front facing seat portion facing the near side, The fastening device uses the front-facing seat portion and the back-facing seat portion to engage with a fastened member.

  In relation to the fastening device, the easily deformable region and the hardly deformable region are made of materials having different physical properties.

  In relation to the fastening device, the easily deformable area and the hardly deformable area have different shapes.

  In relation to the fastening device, the easily deformable region is thin and the hardly deformable region is thick.

  In relation to the fastening device, the easily deformable region and the hardly deformable region are continuous in the axial direction.

  In relation to the fastening device, the hard-to-deform regions are respectively arranged on both outer sides in the axial direction of the easy-to-deform regions.

  In relation to the fastening device, the easily deformable region and the hardly deformable region are continuous in the circumferential direction.

  In relation to the fastening device, the plurality of easily deformable regions and the plurality of hardly deformable regions are alternately continued in the circumferential direction.

  In relation to the fastening device, the power transmission portion is configured to move in the axial direction inside the member to be fastened when an axial force that exceeds the axial force acting when the rear engagement portion is deformed or displaced is applied. It has a contraction mechanism that contracts in length.

  In relation to the fastening device, the power transmission section includes a first power transmission piece located on the back side and a second power transmission piece located on the near side, the first power transmission piece and the second power transmission piece. The length of the power transmission portion in the axial direction contracts by sliding the power transmission piece in the axial direction.

  In relation to the fastening device, the power transmission part is constituted by a member that is extendable in the axial direction.

  In relation to the fastening device, the power transmission part is constituted by a cylindrical member having a plurality of notches extending in a direction perpendicular to the axis.

  In relation to the fastening device, the power transmission section is constituted by a member that is elastically deformable in the axial direction.

  In relation to the fastening device, the power transmission portion, the back side engagement portion, and the clamping portion are configured to engage with each other in the circumferential direction so as to be freely rotatable.

  In relation to the fastening device, the power transmission unit, the back side engagement unit, and the clamping unit are integrally configured.

  In relation to the fastening device, the shaft includes a shaft portion extending in the axial direction that can be rotated with the first rotating portion and has a male screw portion, and the clamping portion has a female screw portion that is screwed with the male screw portion. The second rotating part and the power transmission part can be rotated, and the clamping part and the power transmission part are rotated between the clamping part and the power transmission part, It is provided with the interlocking mechanism which moves a clamping part and the said power transmission part relatively to an axial direction, It is characterized by the above-mentioned.

  In relation to the fastening device, the difficult-to-deform region of the back-side engaging portion has the front-facing seat portion facing the front side before being deformed or displaced, and the clamping portion and The easily deformable region is deformed by approaching the power transmitting portion, the front facing seat portion of the hard deformable region moves radially outward, and the front facing seat portion is the clamping portion and the power transmitting portion. It protrudes to the outside in the radial direction.

  According to the present invention, it is possible to achieve both an increase in fastening force and a reduction in the burden on the operator.

In the fastening device according to the first embodiment of the present invention, (A) an overall front partial sectional view in a reduced diameter state, (B) an entire front partial sectional view in an enlarged diameter state, (C) FIG. CC sectional drawing, (D) is DD sectional drawing of FIG. 1 (A). It is the whole front fragmentary sectional view in the diameter-expanded state after the fastening of the fastening device. According to a modification of the fastening device, (A) and (C) are front partial sectional views in the vicinity of the rear engagement portion in the reduced diameter state, and (B) and (D) are the rear engagement portions in the expanded diameter state. It is a front fragmentary sectional view of the vicinity. 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. In the modified example of the fastening device, (A) a plan view of the back side engaging portion in the reduced diameter state, (B) a whole front partial sectional view in the reduced diameter state, (C) a back side engaging portion in the expanded diameter state (D) Whole front partial sectional view in the diameter-expanded state, (E) EE arrow sectional view of FIG. 5 (B), (F) is FF arrow view of FIG. 5 (B). It is sectional drawing. It is the whole front fragmentary sectional view in the diameter-expanded state after the fastening of the fastening device. (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. 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 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 modification of the fastening device, (B) The whole front fragmentary sectional view in the diameter-expansion state. (A) is an overall front partial cross-sectional view and bottom view in which the right half is in a reduced diameter state and the left half is in an enlarged diameter state according to the fastening device of the second embodiment of the present invention, and (B) is the fastening It is the whole front fragmentary sectional view and bottom view in which the right half is a diameter-reduced state and the left half is a diameter-expanded state, according to a modification of the device. (A) is a front fragmentary sectional view of a clamping part, a back side engaging part, and a power transmission part according to the fastening device, and (B) is a clamping part, a back side engaging part and a modification according to a modification of the fastening device. The front view of a power transmission part, and BB arrow sectional drawing of a front view, (C) is the front view of a clamping part, a back side engaging part, and a power transmission part which concerns on the modification of the fastening device, and a front It is CC sectional view taken on the line of the figure. (A) is a front view of a clamping part, a back side engaging part, and a power transmission part according to a modification of the fastening device, and a cross-sectional view taken along the line AA in the front view, and (B) is a modification of the fastening device. It is the front view of a clamping part, a back side engaging part, and a power transmission part which concerns on an example, and BB arrow sectional drawing of a front view. It is AA arrow sectional drawing of the front view, side view, and front view of a clamping part, a back side engaging part, and a power transmission part which concern on the modification of the fastening device. It is the front view in the middle of the production process of the clamping part, back side engagement part, and power transmission part which concerns on the modification of the fastening device, the front view after completion of production, and the AA arrow sectional view of the front view. (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 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) to (L) Perspective views of a power transmission unit and the like to which these structures are applied It is. (A) thru | or (C) and (E) are front sectional views showing the 2nd rotation part concerning the modification of the fastening device, the power transmission part, the back side engagement part, and the clamping part, (D ) Is a perspective view of the same portion, and (F) is a perspective view according to a modification 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.

  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.

  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.

  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 comprised by the plane which becomes a right angle to an axial direction, a cone-shaped taper surface may be sufficient.

  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.

  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.

  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. 1C, 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.

  When the first and second rotating portions 15 and 20 are relatively rotated, the relative rotation is converted into relative movement in the axial direction of the sandwiching portion 10 and the power transmitting portion 25 by the screwing portion 30.

  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 integrated is illustrated here, both may be separate.

  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 power transmission unit 25 employs a contraction structure whose length can be contracted inside the hole HP of the fastened member H. As the contraction / shrinkage 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 second power transmission piece 28B is 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. 1D, a groove or a row of protrusions extending in the axial direction and engaging with each other 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. 1 (B), after the clamping unit 10 is moved to the near side and the rear side engagement unit 60 is expanded in diameter, an external force is further applied so as to further contract the power transmission unit 25 in the axial direction. Then, as shown in FIG. 2, 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.

  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 rear side engaging portion 60 is expanded in diameter, the transmission portion 25 is not contracted in the axial direction, only the clamping portion 10 is slid in the axial direction, and a larger axial force (that is, When an axial force at the time of fastening) is applied, the shearing portion 29 is actively broken and the power transmission portion 25 is contracted.

  The back side engaging portion 60 is a deformable sleeve here, and by easily buckling toward the outside in the radial direction, the front facing seat portion 64 is expressed using the side surface of the deformed sleeve after deformation. Let

  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.

  As shown in FIG. 1 (A), the back side engaging portion 60 is an annular member, and has a contact surface 63 facing the front side in the axial direction and a holding portion 10 facing the back side in the axial direction. It has a back-side engagement surface 66 that contacts the receiving portion 11.

  The back side engaging portion 60 has an easily deformable region 620 that is easily deformed with respect to an external force, and a difficultly deformable region 640 that is less easily deformed than an easily deformable region 640 with respect to an external force. The easily deformable region 620 and the hardly deformable region 640 are made of materials having different physical properties. For example, in this embodiment, the easily deformable region 620 is made of a metal raw material, and at least a part (or all in some cases) of the hardly deformable region 640 is made of hardened steel. In addition, although the case where the physical properties differ from each other is illustrated here depending on the quenched state of the metal material, the present invention is not limited to this. For example, the easily deformable region 620 may be made of carbon steel for mechanical structure (for example, S45C) and the hardly deformable region 640 may be made of chrome molybdenum steel, and may be integrated by joining them together. Alternatively, the easily deformable region 620 may be a resin material or a rubber material, the hardly deformable region 640 may be a metal material, and both may be integrally molded.

  Both the easily deformable region 620 and the hardly deformable region 640 are ring-shaped regions, which are continuous in the axial direction. Specifically, the hard deformation regions 640 and 640 are arranged on both outer sides in the axial direction of the easy deformation region 620, respectively.

  As a result, as shown in FIG. 1B, when the clamping unit 10 and the power transmission unit 25 approach each other, the easily deformable region 620 on the center side in the axial direction buckles preferentially and expands outward in the radial direction. The difficult deformation region 640 tilts radially outward. As a result, the side surface of the hard-to-change deformation region 640 serves as a forward facing seat portion 64 and comes into contact with the back side end surface 26 on the back side in the axial direction of the power transmission portion 25 and the fastened member H.

  According to the fastening device 1 of this embodiment, since the back side engaging part 60 has the easily deformable region 620, the back side engaging part 60 can be easily deformed (or buckled). . On the other hand, since the back side engaging part 60 has the hard deformation area | region 640, it becomes possible to raise the intensity | strength or rigidity of the back side engaging part 60 after a deformation | transformation. As a result, it is possible to reduce both the burden on the worker during fastening and increase the fastening force.

  Further, according to the fastening device 1 of the present embodiment, the distance (shrinkage distance) M between which the first power transmission piece 28A and the second power transmission piece 28B slide is equal to or more than a quarter of the total length of the power transmission section 25. It is possible to make it preferably one third or more. 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.

  Furthermore, according to the fastening device 1 of the present embodiment, when the first rotating portion 15 and the second rotating portion 20 are relatively rotated in the reduced diameter state of FIGS. The shaft portion 5 rotates together with the portion 15, and the clamping portion 10 rotates together with the second rotation portion 20. As a result, as shown in FIGS. 1C and 1D, the clamping portion 10 is moved to the near side by the screwing portion 30 between the shaft portion 5 and the clamping portion 10, and the back side engaging portion 60 is moved. The diameter can be increased. 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.

  In addition, in the said embodiment, although the case where the easily deformable area | region 620 was arrange | positioned only in the center of the back side engaging part 60 was illustrated, this invention is not limited to this. For example, as shown in FIG. 3A, in the back side engaging portion 60, it is also preferable that a plurality of easily deformable regions 620 and a plurality of hardly deformable regions 640 are alternately arranged along the axial direction. If it does in this way, as shown in FIG.3 (B), it will become possible to buckle only the specific location of the back side engaging part 60, and to expand it to a radial direction outer side easily.

  Further, in the above embodiment, the case where the shape of the easily deformable region 620 and the hardly deformable region 640 is the same (particularly, the cross-sectional shape in the direction perpendicular to the axis is the same) is illustrated, but the present invention is not limited to this. For example, as illustrated in FIG. 3C, the easy-deformation region 620 and the hardly-deformable region 640 that are continuous in the axial direction can have different shapes. Thereby, even if the material has the same physical properties, the mechanical characteristics of the easily deformable region 620 and the hardly deformable region 640 are made different.

  In FIG. 3 (A), an annular slit having a depth in the radial direction is provided on the inner peripheral surface or the outer peripheral surface of the cylindrical member, and by this slit, an easily deformable region 620A that is vulnerable to an external force, 620B and 620C are formed.

  Here, a slit is formed on the outer peripheral surface side to form an easily deformable region 620A on the inner peripheral surface side in the central portion to be buckled so as to protrude outward in the radial direction, and the hardly deformable region 640 is formed from the easily deformable region 620A. On both outer sides separated in the axial direction, slits are formed on the inner peripheral surface side, and easily deformable regions 620B and 620C are formed on the outer peripheral surface side. As a result, when the back side engaging part 60 is clamped in the axial direction by the clamping part 10 and the power transmission part 25, as shown in FIG. 3 (B), the slits are opened so that the easily deformable regions 620A, 620B, 620C is bent, and the hard deformation region 640 can be tilted.

  On the other hand, as shown in FIG. 4 (A), a wide slit is formed on the inner peripheral surface side and an easily deformable region 620A is formed on the outer peripheral surface side in the central portion to be buckled so as to protrude outward in the radial direction. Even if both outer sides separated in the axial direction from the easily deformable region 620A via the hardly deformable region 640, wide slits are formed on the outer peripheral surface side, and the easily deformable regions 620B and 620C are formed on the inner peripheral surface side. good. As a result, when the back side engaging part 60 is clamped in the axial direction by the clamping part 10 and the power transmission part 25, the wide slits are closed as shown in FIG. , 620C is bent, and the hard deformation region 640 can be tilted. That is, in these cases, the mechanical strength is made different by making the easily deformable region 620 thin and the hard deformable region 640 thick.

  In the above-described embodiment, the case where the easily deformable region 620 and the hardly deformable region 640 are continuous in the axial direction is illustrated. However, the present invention is not limited to this and can be continued in the circumferential direction. The case will be described in detail below.

  In the back side engaging portion 60 shown in FIG. 5, the back side engaging 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 rear end surface 26 on the rear side in the axial direction of the power transmission portion 25 in advance. 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. 5A, a plurality of (three in this case) rear side engaging portions 60 are arranged in the circumferential direction, and each has a front side 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 rear engagement piece 62 is thick and has high rigidity, and corresponds to the hardly deformable region 640. On the other hand, the protrusion restricting portion 70 is thin and easily deformable, and corresponds to the easily deformable region 620.

  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 member that is folded in the circumferential direction by being bent 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. 5 (C), if 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. 5D, 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.

  Thereafter, as shown in FIG. 6, the shearing portion 29 is sheared, the second power transmission piece 28 </ b> B enters the outside of the first power transmission piece 28 </ b> A, and the total length of the power transmission portion 25 is shortened. The fastened member H is fastened by the part 60 and the second rotating part.

  In this example, the continuous ring portion 72 that becomes the easily deformable region 620 and the back side engaging piece 62 that becomes the hardly deformable region 640 are alternately continued in the circumferential direction. Therefore, even if the back side engaging piece 62 side, which is a washer after diameter expansion, is designed to be thick, the connecting portion 72 can be easily deformed, so that the burden on the operator when tightening is reduced.

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

  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.

  Moreover, the back side engagement piece 62 can be thickened in the radial direction and the axial 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.

  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. 7, 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. 9, 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-described 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. Although illustrated, this invention is not limited to this. For example, as shown in FIG. 10, the receiving part 11 is a first receiving part 11a that is a tapered surface on the inner peripheral side, and a second that is disposed on the outer peripheral side of the first receiving part 11a and is a flat surface that 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 the diameter reduction of FIG. 10 (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. 10 (B), 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. 11, stepped 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. 12, 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 face 26 abut each other in the expanded diameter state of FIGS. 5C and 5D is illustrated, but the present invention is not limited to this. . For example, as shown in FIG. 13B, 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. In this way, the fastening amount (tightening amount) by the back side engaging portion 60 and the second rotating portion 20 can be increased by a distance T that allows the power transmission portion 25 to enter the back side engaging portion 60. Thus, it becomes possible to flexibly cope with a change in the thickness of the fastened member H.

  In addition, in the said embodiment, the screwing part 30 is arrange | positioned between the axial part 5 and the clamping part 10, and the clamping part 10 moves to the near side and illustrates the case where the back side engaging part 60 is expanded in diameter. However, the present invention is not limited to this.

  For example, as shown in FIG. 14A, a male screw part 32 is arranged on the front side of the shaft part 5 to form a female screw body, a second rotating part 20 is used as a nut, and a female screw part 31 is arranged on the inner peripheral surface. The screwing portion 30 can be configured by screwing the male screw portion 32 and the female screw portion 31 together.

  In this case, the first rotating unit 15, the shaft unit 5, and the holding unit 30 are integrally configured, and the second rotating unit 20 and the first rotating unit 15 are relatively rotated, whereby the holding unit 30. And the power transmission part 25 can be made to approach in an axial direction, and the back side engaging part 60 can be expanded in diameter (refer FIG. 14 (B)). In addition, although the 2nd rotation part 20 and the power transmission part 25 are comprised separately from here, you may integrate.

  The power transmission portion 25 does not necessarily have to be contracted in the axial direction (see FIG. 16 for an example thereof), but as shown in FIG. When the part 20 and the first rotating part 15 are relatively rotated to move the clamping part 30 to the front side, the shearing part 29 of the power transmission part 25 is sheared, and the second power transmission part 28 </ b> A is moved to the second side. The power transmission piece 28 </ b> B enters and the total length of the power transmission unit 25 can be shortened. If it does in this way, it can respond flexibly to the thickness fluctuation of member to be fastened H.

  Further, as shown in FIG. 15, the diameter of the second power transmission piece 28 </ b> B arranged on the front side is set larger than the hole HP, and the second power transmission piece 28 </ b> B 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 portion of the first power transmission piece 28A is caused to enter the inner peripheral side of the second power transmission piece 28B so that the total length of the power transmission portion 25 is reduced (FIG. 15B). reference).

  14 and 15, 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.

  Further, for example, as shown in FIG. 16A, as the back side engaging portion 60, the back side engaging piece 62 (hardly deformable region 640) and the continuous ring portion 70 (easy deformable region 620) shown in FIGS. It is also possible to arrange the deformable sleeve 80 shown in FIG. 1 to FIG. At this time, the buckling load in the axial direction of the deformation sleeve 80 is preferably set to be smaller than the diameter expansion load of the back side engaging portion 60.

  That is, 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 provided with the front side seat portion 64. 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 piece 62 expands in diameter, and the front facing seat portion 64 extends in the axial direction with the fastened member H. Move to the engaging position. In this way, the fastening force can be further increased.

  At this time, in the deformable sleeve 80, the easily variable region 620 located in the center in the axial direction is made of a soft material (for example, a metal raw material), and the hard deformable region 640 that expresses the front facing seat portion 64 after the buckling is completed. For example, it is preferable to use hardened steel. While making the deformation easy, the strength or rigidity after the deformation can be increased.

  Next, with reference to FIG. 17, the fastening apparatus 1 which concerns on 2nd embodiment is demonstrated. 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.

  As shown in FIG. 17A, in the fastening device 1, the second rotating unit 20, the power transmitting unit 25, the back side engaging unit 60, and the clamping unit 10 are integrally configured in the axial direction. Therefore, the turning force applied from the outside to the second rotating unit 20 can be transmitted to the clamping unit 10. In addition, the 2nd rotation part 20, the power transmission part 25, the back side engaging part 60, and the clamping part 10 can also be comprised, for example by injection-molding a resin material, and also cuts a metal material. Or by press molding, or by molding a metal or other powder material.

  The back side engaging portion 60 is a deformable sleeve that approaches the outer peripheral surface of the shaft portion 5 and can be easily buckled outward in the radial direction. The thickness of the deformation sleeve in the radial direction is smaller than the thickness of the sandwiching portion 10 and / or the power transmission portion 25. Therefore, as shown in the left half of FIG. 17A, when the first rotating portion 15 and the second rotating portion 20 are relatively rotated to bring the clamping portion 10 and the power transmitting portion 25 closer, the back side engagement is achieved. The joint portion 60 buckles and deforms outward in the radial direction to form a so-called washer having a front-facing seat portion 64.

  Although not shown in FIG. 17, the power transmission unit 25 employs a contraction structure that can contract in the axial direction. This will be described later.

  In addition, while the back side engaging part 60 of this embodiment is comprised integrally between the clamping part 10 and the power transmission part 25, while being able to rotate the clamping part 10 and the power transmission part 25, a clamping part 25 and the power transmission unit 25 also serve as an interlocking mechanism that relatively moves in the axial direction.

  The back side engaging portion 60 is located at the boundary between the center easily deformable region 620 </ b> A located at the center in the axial direction, the front easily deformable region 620 </ b> B located at the boundary with the power transmission portion 25, and the clamping portion 30. An easily deformable region 620C is provided, which is a soft material, a thin material, or a fragile material. On the other hand, the portion where the front-facing seat 64 is formed (expressed) after buckling is completed, that is, the hard deformation regions 640 and 640 on both outer sides in the axial direction of the central easy deformation region 620A are made of a hard material, a thick material, or a highly rigid material. Material. This is because the strength or rigidity after the deformation can be increased while facilitating the deformation.

  When these are made of a metal material, for example, they have a center easily deformable region 620A, a front easily deformable region 620B, and a back easily deformable region 620C, and these are soft materials, thin-walled materials, or fragile materials. And On the other hand, at least a part (or all in some cases) of buckling can be made of a metal raw material, and at least a part (or all in some cases) of the hardly deformable regions 640 and 640 can be made of hardened steel.

  In addition, although the case where the back side engaging part 60 approached the outer peripheral surface of the axial part 5 was illustrated in FIG. 17 (A), this invention is not limited to this. For example, as shown in FIG. 17 (B), the rear side engaging portion 60 is disposed at a position where a clearance is provided in the radial direction from the shaft portion 5 within a range where buckling is possible by the sandwiching portion 10 and the power transmission portion 25. May be.

  Next, the axial contraction structure of the power transmission unit 25 will be described. For example, as shown in FIG. 18 (A), it is preferable that the power transmission section 25 is formed in a so-called bellows shape and is expanded and contracted in the axial direction. The load at the time of expansion / contraction of the power transmission portion 25 is set to be larger than the buckling load in the axial direction of the back side engagement portion 60. In this way, after the buckling of the back side engaging portion 60 is completed, when the clamping portion 10 and the power transmission portion 25 are brought closer to each other with a stronger force, the power transmission portion 25 contracts and the fastened member H It is possible to engage in the axial direction.

  As another example, as shown in FIG. 18 (B), the power transmission portion 25 has a V-shaped first slit 226A and first slits 226A and 180 in the side view from the radially outer side to the inner side with respect to the cylindrical member. It is also preferable to form the second slits 226B having a phase difference of degrees alternately in the axial direction. In this way, when the power transmission unit 25 is viewed from the side, the first and second slits 226A and 226B form a so-called jagged shape (zigzag) having a gap in the axial direction. It becomes possible to contract in the direction.

  The phase and the number of the slits are not particularly limited. As shown in FIG. 18C, the first slit 226A having a V-shape in a side view from the radially outer side toward the inner side with respect to the cylindrical member, A second slit 226B having a phase difference of 180 degrees from one slit 226A, a first slit 226A, 226B, a third slit 226C having a phase difference of 90 degrees, and a third slit 226C having a phase difference of 180 degrees. A fourth slit 226D serving as a phase difference may be formed. The first and second slits 226A, 226B are in the same position in the axial direction, and the third and fourth slits 226C, 226D are in the same position in the axial direction, but with respect to the first and second slits 226A, 226B Placed at a position shifted in the axial direction. Even in this case, it is possible to contract in the axial direction by the gap formed in the axial direction.

  Furthermore, the shape of the slit is not particularly limited. A transmission portion 25 shown in FIG. 19A, which is an application of FIG. 18B, includes first and second slits 226A and 226B having parallel shapes that are parallel to the direction perpendicular to the axis and form a gap in the axial direction. Have. 19B, which is an application of FIG. 18C, and first to fourth slits 226A, 226B, 226C, and 226D having parallel shapes. Also in these cases, it is possible to contract in the axial direction by the gap formed in the axial direction in the power transmission unit 25.

  Furthermore, the depth (depth) of the slit is not particularly limited. For example, like the power transmission unit 25 shown in FIG. 20 which is an application of FIG. 19A, the innermost portions (re-rear surfaces) of the first and second slits 226A and 226B are opposite in phase to the opening side of the slit. It is good also as a shape where the innermost part extends in the radial direction so as to wrap around to the (180 degree phase difference) side. If it does in this way, the rigidity of power transmission part 25 will fall and it can contract flexibly in the direction of an axis.

  Furthermore, like the power transmission unit 25 shown in FIG. 21 which is an application of FIG. 19B, the first to fourth slits 226A, 226B, 226C having a parallel shape that forms a fine axial gap with respect to the tubular member, After forming 226D (see FIG. 21A), the first to fourth slits 226A, 226B, 226C, and 226D are extended so as to be plastically deformed in the axial direction (see FIG. 21B). Can be extended in the axial direction, resulting in a V-shaped slit in side view.

  In addition, the contraction structure of the axial direction of the power transmission part 25 demonstrated in FIG. 18 thru | or FIG. 21 is applicable to the power transmission part 25 of the fastening apparatus 1 demonstrated in 1st embodiment.

  As described above, in the first embodiment, the case where the material itself of the power transmission unit 25 does not expand and contract in the axial direction is illustrated, but the present invention is not limited to this. For example, as shown in FIG. 22, the power transmission portion 25 may include a cylindrical thin portion 25 </ b> A that approaches the outer peripheral surface of the shaft portion 5. 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.

  22B, 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. 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. Although illustration of a 2nd rotation part is abbreviate | omitted, as shown to FIG. 23 (A), both ends of the thin part 25A approach the hole HP of the to-be-fastened member H, and the center side is on the outer peripheral surface of the axial part 5. It can also be a curved cylindrical shape approaching. As shown in FIG. 23 (B), both end portions 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. 23 (C), 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. 23D, the thin portion 25A may have a cylindrical structure with 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. 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.

  Further, as shown in FIG. 23E, the power transmission portion 25 is formed by laminating wave ring pieces in which a ring-shaped member is formed into 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.

  22 and FIG. 23, the axial force required when the rear side engaging portion 60 is deformed or displaced prevents the power transmission portion 25 from contracting in the axial direction. When force (that is, axial force at the time of fastening) is applied, the force is positively contracted.

  Here, the case where the number of deformation sleeves of the back side engaging portion 60 is one is illustrated, but a plurality of deformation sleeves are arranged separately or integrally in the axial direction, and each of the deformation sleeves is buckled to thereby provide a multi-stage washer. It is also possible to make it.

  Furthermore, in the modified example of the first embodiment, the receiving portion 11 of the clamping portion 10 and the back side engaging surface 66 of the back side engaging portion 60 are used as tapered surfaces, and the back side engagement is performed using this tapered surface. Although the case where the back side engaging piece 62 of the part 60 is moved to the radial direction outer side was illustrated, this invention is not limited to this.

  For example, as shown in FIG. 24 and FIG. 25, 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. Further, an elastically variable restricting portion 610 that surrounds the back side engaging pieces 660 and 680 in an annular shape may be provided. The restricting portion 610 is made of a material such as rubber, for example, and biases the back side engaging pieces 660 and 680 radially inward. In addition, the back side engagement pieces 660 and 680 come to the hard deformation area, and the restricting portion 610 corresponds to the hard deformation area.

  Here, similarly to the modified examples shown in FIGS. 14 to 16, the male screw portion 32 is disposed on the front side of the shaft portion 5 to form a female screw body, the second rotating portion 20 is used as a nut, and the female screw is provided on the inner peripheral surface. A case is shown in which a threaded portion is formed by arranging a portion and screwing the male screw portion 32 and the female screw portion.

  As shown in FIG. 28, 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. 28, the first back side engagement piece 660 is in a posture reversed in the axial direction and the diameter direction.

  The first back side engagement piece 660 and the second back side engagement piece 680 are slidable in the radial direction by the length of the oval hole in a state where the shaft portion 5 is passed through the through holes 661 and 681. . 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.

  Referring back to FIG. 24, the first back side engaging piece 660 and the second back side engaging piece 680 have a common shape, but are in a state where they are reversed in the axial direction and reversed in the diametrical direction, that is, the 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.

  Therefore, as shown in FIGS. 26 and 27, 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 close to each other, the urging force of the regulation unit 610 is resisted. However, the first back side engagement piece 660 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, according to the fastening device of this embodiment, it is possible to make the rotation direction of the relative rotation of the first rotation unit 15 and the second rotation unit 20 opposite to the tightening direction. Then, the first back side engagement piece 660 and the second back side engagement piece 680 can be returned to the original coaxial positions by the contraction force of the restricting portion 610 in the biased state with respect to the contraction direction. It is also possible to remove the fastening device 1 that was in the fastening body with respect to the fastened member H from the fastened member H.

  24 to 28 exemplify a case where the rear side engaging portion 60 is disposed in a state in which the inner side engaging portion 60 can rotate relative to the clamping portion 10 and the power transmission portion 25 in the circumferential direction. However, the present invention is not limited to this.

  For example, as shown in FIGS. 29 and 35, the receiving guide guide irregularities 11 x extending in the oval direction of the through holes 661 and 681 (diameter direction of the shaft portion 5) are formed with respect to the receiving portion 11 in the clamping portion 10. In addition, engagement piece guide irregularities 664 and 684 extending in the diameter direction of the shaft portion 5 are formed on the respective back side engagement surfaces 66 of the first back side engagement piece 660 and the second back side engagement piece 680. Then, the receiving portion guide unevenness 11x and the engaging piece guide unevenness 664, 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.

  That is, as in the case shown in FIG. 1 and the like, when the screw portion 30 is formed between the shaft portion 5 and the sandwiching portion 10 and the sandwiching portion 10 and the shaft portion 5 are relatively rotated, Since the part 60 exists between the clamping part 10 and the power transmission part 25 and can be rotated together, it can also serve as the interlocking mechanism in the present invention.

  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. 30, the rotational force of the power transmission unit 25 can be transmitted to the clamping unit 10 via the back-side engagement unit 60, and thus also serves as the interlocking mechanism 90 shown in the first embodiment ( Can be omitted).

  As shown in FIGS. 31 and 32, 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 26x and the seat portion guide unevenness are obtained. 64x, inner guide unevenness 663a, 683a, engagement piece guide unevenness 664, 684, receiving portion guide unevenness 11x, while being guided in the diametrical direction, the first back side engagement against the urging force of the restricting portion 610 The 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.

  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 it separates was illustrated, this invention is not limited to this, For example, the front facing seat part 64 of each back side engaging piece 62 of the back side engaging part 60 shown in 1st embodiment of 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.

  Furthermore, in the first to second embodiments, the case where the back side engaging portion 60 is mainly arranged in the axial direction is exemplified, but for example, as shown in FIG. 36, the back side engaging 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. These back side engagement pieces 690A, 690B, and 690C serve as a hardly deformable region, and a continuous ring portion (not shown) serves as a readily deformable region.

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

  FIGS. 37A to 37C 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 the back side engaging part 60. FIG. Therefore, the in-plane of the triangle becomes a hardly deformable region, and each side or each vertex of the triangle can constitute an easily deformable region that can be easily deformed by a fold.

  FIGS. 37D to 37F 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 the back side engaging part 60. FIG. Accordingly, the trapezoidal plane is a hardly deformable region, and each side or each vertex of the trapezoid can constitute an easily deformable region that can be easily deformed by a fold. It is also possible to use a parallelogram instead of the trapezoid. For reference, FIG. 37G 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. 37 (H) 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. 37 (I) shows an example in which the telescopic tube structure D is applied to a part of the power transmission portion 25, the remaining portion is a straight polygonal tube, and the telescopic tube structure D is applied to the rear engagement portion 60. It is. Note that a constriction is formed at the boundary between the power transmission portion 25 and the rear side engagement portion 60. 37 (J) and (K) are examples in which the expansion / contraction tube structure D is applied to the power transmission portion 25 and the expansion / contraction tube structure D is also applied to the back side engagement portion 60. FIG. As for, it forms a confinement at the boundary.

  FIG. 37 (L) is an example in which the second rotating portion 20, the power transmission portion 25, the back side engagement portion 60, and the sandwiching portion 10 are integrally formed, and the PCCP shell structure P is applied to the power transmission portion 25. The telescopic tube structure D is applied to the back side engaging portion 60.

  FIG. 38 (A) is an example in which the second turning portion 20, the power transmission portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, further, a slit in the circumferential direction is formed on the outer peripheral surface of the central portion in the axial direction of the back side engaging portion 60 to form an easily deformable region 620A, and further on the both outer sides in the axial direction of the easily deformable region 620A. The easily deformable regions 620B and 620C are formed by a constricted structure.

  FIG. 38B is an example in which the second rotating portion 20, the power transmitting portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, in the rear side engaging portion 60, the axially central side is curved outward in the radial direction, and a circumferential slit is formed on the outer peripheral surface of the axially central portion to form the easily deformable region 620.

  38 (C) and 38 (D) are examples in which the second rotating portion 20, the power transmitting portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, further, the back side engaging portion 60 is curved so that the center in the axial direction is curved outward in the radial direction, and the thickness is made thinner toward the protruding end. In addition, a plurality of notches extending in the axial direction are formed in the axial direction central portion in the circumferential direction, so that the axial central portion serves as an easily deformable region 620. In addition, the power transmission unit 25 forms a fragile region that is easily buckled or deformed in the axial direction by forming a plurality of openings 25D in a matrix in the middle of the axial direction.

  FIG. 38E shows an example in which the second rotating portion 20, the power transmitting portion 25, the back side engaging portion 60, and the clamping portion 10 are integrally formed. Here, further, in the rear side engaging portion 60, the axially central side is curved outward in the radial direction so that the wall thickness decreases toward the protruding end. Due to this thin structure, the central portion in the axial direction is an easily deformable region 620.

  FIG. 38 (F) 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 (17)

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 back side engaging portion that is clamped in the axial direction between the power transmission portion and the clamping portion;
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;
The back side engaging portion has an easily deformable region that is easily deformed with respect to an external force, and an easily deformable region that is less likely to be deformed than the easily deformable region with respect to the external force.
By causing the sandwiching portion and the power transmission portion to approach each other in the axial direction, the easily deformable region of the back engagement portion is deformed, so that at least the difficult deformation region is more than the sandwiching portion and the power transmission portion. Protruding outward in the radial direction to form a front facing seat facing the front side,
Utilizing the front-facing seat and the back-facing seat, it engages with a fastened member,
Fastening device. The easily deformable region and the hardly deformable region are made of materials having different physical properties,
The fastening device according to claim 1. The easily deformable region and the hardly deformable region have different shapes from each other,
The fastening device according to claim 1 or 2. The easily deformable region is thin, and the difficult deformable region is thick,
The fastening device according to any one of claims 1 to 3. The easily deformable region and the hardly deformable region are continuous in the axial direction,
The fastening device according to any one of claims 1 to 4. The hard deformation region is disposed on both outer sides in the axial direction of the easy deformation region,
The fastening device according to claim 5. The easily deformable region and the hardly deformable region are continuous in the circumferential direction,
The fastening device according to any one of claims 1 to 6. The plurality of easily deformable regions and the plurality of hardly deformable regions are alternately continuous in the circumferential direction,
The fastening device according to claim 7. The power transmission portion includes a contraction mechanism in which an axial length contracts inside the fastened member when an axial force exceeding an axial force acting when the back side engaging portion is deformed or displaced is applied. Characterized by having,
The fastening device according to any one of claims 1 to 8. The power transmission unit includes a first power transmission piece located on the back side and a second power transmission piece located on the near side,
The axial length of the power transmission portion contracts by sliding the first power transmission piece and the second power transmission piece in the axial direction.
The fastening device according to claim 9. The power transmission part is constituted by a member that is extendable in the axial direction,
The fastening device according to claim 9 or 10. The power transmission part is constituted by a cylindrical member having a plurality of notches extending in a direction perpendicular to the axis.
The fastening device according to any one of claims 9 to 11. The power transmission part is constituted by a member that is elastically deformable in an axial direction,
The fastening device according to any one of claims 9 to 12. The power transmission portion, the back side engagement portion, and the clamping portion are configured to engage with each other in the circumferential direction so as to be freely rotatable.
The fastening device according to any one of claims 1 to 13. The power transmission unit, the back side engagement unit and the clamping unit are configured integrally,
The fastening device according to any one of claims 1 to 14. An axial portion extending in the axial direction that can be rotated with the first rotating portion and has an external thread portion;
The clamping part has a female screw part screwed with the male screw part,
The second rotating part and the power transmission part can be rotated,
Between the said clamping part and the said power transmission part, while providing the said clamping part and the said power transmission part, it is provided with the interlocking mechanism which carries out relative movement of this clamping part and the said power transmission part to an axial direction. Features
The fastening device according to any one of claims 1 to 15. The hard deformation region of the back side engaging portion has the front facing seat portion facing the front side before being deformed or displaced,
The easily deformable region is deformed when the sandwiching portion and the power transmitting portion approach each other, the forward facing seat portion of the difficult deformable region moves radially outward, and the forward facing seat portion is the sandwiching portion and It protrudes radially outward from the power transmission part,
The fastening device according to any one of claims 1 to 16.

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