JP2014005859A - Coupling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling structure adjustable in attenuation characteristics for vibration.SOLUTION: A coupling structure 1 includes a first member 2, and a second member 3 coupled to the first member 2 in contact. The coupling structure 1 further includes a rigidity adjustment part 3a formed of a part of the first member 2 or the second member 3 and capable of adjusting rigidity of the part of the first member 2 or the second member 3, thereby changing a friction loss amount on a part of a contact face between the first member 2 and the second member 3.

Description

  The present invention relates to a bonded structure.

  2. Description of the Related Art Conventionally, in machines, building structures, and the like, joint structures having two joined members are used everywhere. In such a coupling structure, two members are coupled by a method such as bolting, adhesion, or welding. For example, in a joint structure that employs bolt fastening, as shown in Patent Document 1, these two members are joined by fastening two members with bolts that pass through the two members.

JP 2012-72913 A

  In a machine or a building structure, vibration is generated by driving an internal mechanism or transmitting from the outside. However, the conventional coupling structure does not have any positive approach to such vibration. For example, when a vibration is applied, a part of the coupled members rubs and a part of vibration energy is dissipated as a friction loss. Therefore, the coupling structure generally has a function of damping the vibration. doing. However, no proposal has been made to adjust the attenuation.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a coupling structure that can adjust the vibration damping characteristics.

  The present invention adopts the following configuration as means for solving the above-described problems.

  1st invention is a coupling structure provided with the 1st member and the 2nd member couple | bonded in contact with the said 1st member, Comprising: It consists of a part of said 1st member or said 2nd member, A rigidity adjusting unit that can change a friction loss amount in at least a part of a contact surface between the first member and the second member by adjusting the rigidity of the part of the first member or the second member; A configuration of providing is adopted.

  According to a second invention, in the first invention, the rigidity adjusting portion adjusts the rigidity in a direction in which the first member and the second member are coupled or in a direction perpendicular to the coupling direction. .

  According to a third aspect of the present invention, in the first or second aspect of the invention, when the contact surface is subjected to a vibration that attempts to move the first member and the second member relative to each other, A structure in which a fixing region where the second member does not slide and a sliding region where the first member and the second member slide are divided, and the rigidity adjusting portion is provided at a fixing portion whose surface is the fixing region. Is adopted.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, a configuration is adopted in which the rigidity in the sliding direction of the sliding portion having the sliding region as a surface is higher than the rigidity in the sliding direction of the rigidity adjusting portion.

  According to a fifth invention, in the third or fourth invention, a configuration is adopted in which the sliding portion has elasticity in the coupling direction.

  According to a sixth invention, in any one of the third to fifth inventions, the rigidity adjusting portion includes a plurality of slits arranged in the amplitude direction of the vibration, and the fastening property at the fixing portion is improved. adopt.

  A seventh invention is the material according to any one of the third to fifth inventions, wherein the rigidity adjusting portion is made of a material having an elastic modulus different from that of the forming material of the first member or the second member abutting through a contact surface. Therefore, a configuration is adopted in which the amount of friction loss in the slip portion is changed by adjusting the slip amount in the slip portion.

  In an eighth aspect based on the seventh aspect, the rigidity adjusting portion is different in an elastic modulus in a coupling direction between the first member and the second member and an elastic modulus in a direction orthogonal to the coupling direction. The configuration is adopted.

  According to the present invention, the rigidity of one of the two members to be coupled is adjusted by the rigidity adjusting unit, and the ease of sliding on a part of the contact surface of these members can be adjusted. For this reason, it becomes possible to change the amount of friction loss generated when vibration is applied. Therefore, according to the present invention, it is possible to adjust the damping characteristic of vibration.

It is a schematic block diagram of the fastening structure which concerns on 1st Embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view. (A) is a longitudinal cross-sectional view which shows schematic structure of the fastening structure which concerns on 2nd Embodiment of this invention, (b) is the bolted plate with which the fastening structure which concerns on 2nd Embodiment of this invention is provided. FIG. It is a longitudinal cross-sectional view which shows schematic structure in the modification of the fastening structure which concerns on 2nd Embodiment of this invention. (A) is a longitudinal cross-sectional view which shows schematic structure of the fastening structure which concerns on 3rd Embodiment of this invention, (b) shows schematic structure of the fastening structure which concerns on 4th Embodiment of this invention. It is a longitudinal cross-sectional view. (A) is a longitudinal cross-sectional view which shows schematic structure of the fastening structure which concerns on 5th Embodiment of this invention, (b) shows schematic structure of the fastening structure which concerns on 6th Embodiment of this invention. It is a longitudinal cross-sectional view. (A) And (b) is a longitudinal cross-sectional view which shows schematic structure of the modification of the fastening structure which concerns on 6th Embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the fastening structure which concerns on 2nd Embodiment of this invention.

  Hereinafter, an embodiment of a coupling structure according to the present invention will be described with reference to the drawings. In the present embodiment, a description will be given using a fastening structure in which two members are joined by fastening with bolts. However, the present invention is not limited to a coupling structure fastened by a bolt, and can also be applied to a coupling structure in which two members are joined by adhesion or welding.

(First embodiment)
Drawing 1 is a schematic structure figure of fastening structure 1 concerning a 1st embodiment of the present invention, (a) is a longitudinal section and (b) is a top view. As shown in these drawings, the fastening structure 1 of this embodiment includes a base plate 2 (first member), a bolted plate 3 (second member), and a bolt 4.

  The base plate 2 is a plate material made of, for example, a disk-like metal, and has a bolt hole through which the bolt 4 is inserted. The bolted plate 3 is a disk-like plate material smaller than the base plate 2 and has a bolt hole through which the bolt 4 is inserted. The bolt 4 is inserted into the bolt hole between the base plate 2 and the bolted plate 3 that are arranged in an overlapping manner, and fastens the base plate 2 and the bolted plate 3 together. In addition, the shape of the base plate 2 and the bolted plate 3 is an example, and actually becomes a shape according to the component shape to be fastened.

  As described above, the fastening structure 1 of the present embodiment includes the base plate 2, the bolted plate 3 coupled in contact with the base plate 2, and the bolt 4 that fastens them. Contact stress resulting from the fastening force of the bolt 4 acts on the contact surface 5 between the base plate 2 and the bolted plate 3. The closer the bolt 4 is, the stronger the fastening force of the bolt 4 is. Therefore, the contact stress has a distribution that becomes weaker in the radial direction around the bolt 4. When such a fastening structure 1 is subjected to vibrations that cause the base plate 2 and the bolted plate 3 to move relative to each other, the base plate 2 and the bolt in the region near the center where the contact stress is strong on the contact surface 5. In the outer region where the contact stress is weak, slip between the base plate 2 and the bolted plate 3 occurs. Note that the present invention can also be applied to a fastening structure in which a slip occurs in a region near the center and no slip occurs in an outer region.

  In the paper published by the inventor of this application “Analysis and Quantitative Prediction of Friction Damping at the Joint of Mechanical Structures Shinki Shinagawa, Eiji Shamoto, Japan Society of Mechanical Engineers, Manuscript Acceptance 01/03/2012” It is described in detail that the attenuation characteristics can be accurately obtained by simulation by considering the surface 5 separately as the fixing region and the sliding region. From the accuracy of such simulation, it is appropriate to consider that the contact surface is also divided into a fixed region and a slip region when vibration is applied even in an actual fastening structure.

  Hereinafter, a region in the contact surface 5 where the base plate 2 and the bolted plate 3 do not slip within a vibration cycle when a predetermined vibration is applied is referred to as a fixing region Ra, and the vibration is generated when the predetermined vibration is applied. A region where the base plate 2 and the bolted plate 3 slide within the period is referred to as a slip region Rb. The calculation method of the position of the boundary between the fixed region Ra and the slip region Rb is described in the above paper, and detailed description thereof is omitted here. Note that when vibration is applied, the boundary between the region that is actually slipping and the region that is not slipping is greatly displaced according to the magnitude of the vibration displacement. That is, at the moment when the amplitude displacement of the vibration is zero, there is no actual sliding region. However, the “boundary between the fixed region Ra and the slip region Rb” in the present embodiment does not mean the boundary between the actually sliding region and the non-sliding region as described above, but a predetermined amplitude. A region where no slip occurs in the vibration period when the vibration is applied is defined as a fixing region Ra, and a region where slip occurs in the vibration period even in a short time is defined as a slip region Rb, which means a boundary between them. . Note that the amplitude and period of the predetermined vibration are set in consideration of the conditions under which the fastening structure 1 is used.

  Further, in the following description, a portion of the base plate 2 having the fixing region Ra on the contact surface 5 as a surface is referred to as a fixing portion 2a, and a portion of the base plate 2 having the sliding region Rb of the contact surface 5 as a surface is referred to as a sliding portion 2b. . Further, a portion of the bolted plate 3 having the fixing region Ra of the contact surface 5 as a surface is referred to as a fixing portion 3a, and a portion of the bolted plate 3 having the sliding region Rb of the contact surface 5 as a surface is referred to as a sliding portion 3b.

  In the fastening structure 1 of the present embodiment, the sliding portion 3b of the bolted plate 3 is formed of the same metal material as the base plate 2, and the fixing portion 3a of the bolted plate 3 has a smaller elastic modulus than the sliding portion 3b. Is formed by. For example, when the sliding part 3b of the bolted plate 3 is formed of iron, the fixing part 3a of the bolted plate 3 can be formed of copper, aluminum, or plastic. As a result, the fixing part 3a of the bolted plate 3 is a part having lower rigidity than the sliding part 3b. That is, in this embodiment, normally, the fixing part 3a of the bolted plate 3 formed of the same material as the sliding part 3b of the base plate 2 or the bolted plate 3 is changed to a material having a small elastic modulus. Thus, the rigidity of the fixing portion 3a is adjusted to be low.

  Low rigidity means that it is easy to deform. In other words, when the vibration that swings in the direction perpendicular to the axial direction of the bolt 4 is applied so that the base plate 2 and the bolted plate 3 are relatively displaced, the fixing portion 3 a of the bolted plate 3 is fixed to the base plate 2. It deforms following the displacement of the fixing part 2a. For this reason, when a vibration having a vibration amplitude larger than a predetermined vibration amplitude considered for setting the fixing portion 2a and the sliding region 2b occurs, or when the fastening force by the bolt 4 is reduced for some reason. Even if it exists, it will become difficult to produce the sliding of the adhering site | part 2a of the baseplate 2, and the adhering site | part 3a of the bolted plate 3. FIG. Therefore, compared with the case where the rigidity of the fixing part 3a of the bolted plate 3 is not adjusted low, the fastening property in the fixing region Ra can be improved. Such a fixed portion 3a of the bolted plate 3 is formed of a part of the bolted plate 3, and by adjusting the rigidity of a part of the bolted plate 3, the fastening property between the base plate 2 and the bolted plate 3 is improved. As described later, the friction loss amount in the sliding region Rb can be increased (changed) as will be described later. That is, in the fastening structure 1 of the present embodiment, the fixing portion 3a of the bolted plate 3 functions as the rigidity adjusting portion of the present invention. Here, the fastening property means that it is difficult for slippage to occur on the contact surface between the base plate 2 and the bolted plate 3 when an external force is applied.

  Moreover, if it is the fastening structure by the volt | bolt 4 like the fastening structure 1 of this embodiment, the fixation area | region Ra will arise in the volt | bolt 4 side, and the sliding area | region Rb will arise on the outer side of the fixation area | region Ra. For this reason, without knowing the boundary between the actual fixing region Ra and the sliding region Rb, the bolt 4 side portion of the bolted plate 3 is adjusted to be a fixing portion 3a, and the rigidity is adjusted to be low, and the outer portion is set as the sliding portion 3b. You may employ | adopt the structure which makes rigidity higher than the adhering site | part 3a.

  According to the fastening structure 1 of the present embodiment as described above, one of the bolted plates 3 out of the base plate 2 and the bolted plate 3 to be coupled by the fixing portion 3a of the bolted plate 3 that functions as a rigidity adjusting portion. The rigidity of the part is adjusted low. As described above, the rigidity of the fixing portion 3a of the bolted plate 3 is lowered, so that the ease of sliding in the fixing region Ra that is a part of the contact surface 5 is reduced, and the fastening property between the base plate 2 and the bolted plate 3 is improved. Can be increased. Thus, by improving the fastening property between the base plate 2 and the bolted plate 3, the necessity to obtain the fastening property at the sliding portion 3b is reduced, and the base plate 2 and the bolted plate 3 are actively slid at the sliding portion 3b. It becomes possible to make it. Then, by sliding the base plate 2 and the bolted plate 3 largely at the sliding portion 3b, the friction loss amount at the sliding portion 3b is greatly increased, and the vibration damping characteristic can be increased. According to such a fastening structure 1 of the present embodiment, the setting range of the slip amount between the base plate 2 and the bolted plate 3 in the sliding portion 3b can be widened, and the vibration damping characteristic can be arbitrarily set within the range. It becomes possible to adjust.

  Further, according to the fastening structure 1 of the present embodiment, the rigidity in the sliding direction (vibration amplitude direction) of the sliding portion 3b of the bolted plate 3 is higher than the rigidity in the sliding direction of the rigidity adjusting portion. For this reason, when the vibration is applied, the sliding portion 3b of the bolted plate 3 is less likely to be deformed than the fixing portion 3a of the bolted plate 3 that is the rigidity adjusting portion, and the sliding portion 3b can be surely slid largely. It becomes possible. For this reason, it is possible to increase the friction loss amount and obtain a large frictional damping.

  Further, as shown in FIG. 1A, it is preferable to form a notch 3c at a boundary portion between the fixing portion 3a and the sliding portion 3b. As a result, the fixing region Ra and the sliding region Rb are separated, and the base plate 2 and the bolted plate 3 can slide over the entire sliding region Rb without being affected by the fixing region Ra. Therefore, it is possible to further increase the friction loss amount.

  In the present embodiment, a configuration is adopted in which the amount of friction loss in the fixing region Ra is reduced by adjusting the rigidity of the fixing portion 3a of the bolted plate 3 to be low. However, instead of adjusting the rigidity of the fixing part 3a of the bolted plate 3 to be low, the rigidity of the fixing part 2a of the base plate 2 may be adjusted to be low. In this case, the fixing portion 2a of the base plate 2 functions as the rigidity adjusting portion of the present invention, and similarly, the amount of friction loss in the fixing region Ra is reduced.

  It is also conceivable to adjust the rigidity of the sliding part 3b of the bolted plate 3 to be high instead of adjusting the rigidity of the fixing part 3a of the bolted plate 3 to be low. In such a case, if the same vibration is applied, the deformation amount of the sliding part 3b of the bolted plate 3 due to the vibration is reduced, and the sliding part 2b of the base plate 2 and the sliding part 3b of the bolted plate 3 Becomes easy to slip. As a result, the amount of friction loss in the slip region Rb is increased, and the amount of vibration attenuation can be increased. Even when the rigidity of the sliding portion 2b of the base plate 2 is adjusted to be high, the friction loss amount in the sliding region Rb is similarly increased.

  Further, for example, it is conceivable to use CFRP (Carbon Fiber Reinforced Plastics) having anisotropy in elastic modulus for the fixing portion 3a and the sliding portion 3b. CFRP is a material formed by impregnating a fabric made of carbon fiber with plastic, and the elastic modulus differs depending on the direction of the carbon fiber. Using such a CFRP, for example, the fixing part 3a is made highly rigid in the joining direction of the base plate 2 and the bolted plate 3 and low in the direction perpendicular to the joining direction, and the sliding part 3b is made of the base plate 2 and the bolted plate. 3 has a low rigidity in the connecting direction and a high rigidity in a direction perpendicular to the connecting direction. In such a case, the fixing portion 3a is displaced without slipping and the sliding portion 3b is deformed due to vibrations in the left-right front-rear direction and the torsion direction (that is, the direction in the plane perpendicular to the coupling direction). Therefore, it is possible to realize a configuration that slides greatly. Note that CFRP is merely an example. Even other than CFRP, any one having anisotropy in elastic modulus can be used instead of CFRP.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

  FIG. 2A is a longitudinal sectional view showing a schematic configuration of the fastening structure 11 according to this embodiment, and FIG. 2B is a bottom view of the bolted plate 13 provided in the fastening structure 11. As shown in FIG. 2A, the fastening structure 11 of this embodiment includes a base plate 12, a bolted plate 13, and bolts 14.

  The base plate 12 is a plate material made of, for example, a disk-like metal, and has a bolt hole through which the bolt 14 is inserted. The bolted plate 13 is a disk-like plate material having a smaller diameter than the base plate 12, and has a bolt hole through which a bolt 14 is inserted. The bolts 14 are inserted through bolt holes of the base plate 12 and the bolted plate 13 that are arranged in contact with each other so as to overlap each other, and fasten the base plate 12 and the bolted plate 13 together.

  The bolted plate 13 includes a fixing part 13a that is a part on the bolt 14 side and a sliding part 13b that is a part outside the fixing part 13a. The lower surface of the fixing portion 13 a is in contact with the upper surface of the base plate 12. This lower surface constitutes a part of the contact surface 15 where the base plate 12 and the bolted plate 13 are in contact with each other, and forms a fixing region Rc of the contact surface 15. The fixing region Rc is the same as the fixing region Ra of the first embodiment when a vibration for moving the base plate 12 and the bolted plate 13 relative to the fastening structure 11 is applied. Further, the base plate 12 and the bolted plate 13 do not slide. As described above, the fixing portion 13a is formed of a part of the bolted plate 13 whose surface is the fixing region Rc.

  Further, as shown in FIG. 2B, the fixing portion 13a includes a plurality of concentric slits 13c and radial slits 13d on the lower surface side. The concentric slits 13 c are annular slits centered on the bolts 14, and a plurality of concentric slits 13 c are arranged in the radial direction centered on the bolts 14. These concentric slits 13 c are formed deeper as the distance from the bolt 14 increases. The radial slits 13d are linear slits extending in the radial direction with the bolt 14 as the center, and a plurality of radial slits 13d are arranged in the circumferential direction with the bolt 14 as the center. Note that the concentric slits 13 c do not necessarily have to be formed deeper as the distance from the bolt 14 increases. Further, the arrangement interval of the concentric slits 13 c may be narrowed as the distance from the bolt 14 increases. Alternatively, the arrangement interval of the concentric slits 13c may be constant, and the slit width may be increased as the distance from the bolt 14 increases.

  Such a fixing portion 13a has a structure that is easily deformed in the radial direction around the bolt 14 by being provided with the concentric slit 13c. In other words, the fixing portion 13a has a low rigidity in the radial direction (the direction perpendicular to the axial direction of the bolt 14 that is the connecting direction of the base plate 12 and the bolted plate 13) due to the concentric slit 13c. It is adjusted as follows. Further, the fixing portion 13a has a structure that is easily deformed in the circumferential direction around the bolt 14 by providing the radial slit 13d. That is, the fixing portion 13a has a radial slit 13d so that the rigidity in the circumferential direction around the bolt 14 (the direction orthogonal to the axial direction of the bolt 14 that is the coupling direction of the base plate 12 and the bolted plate 13) is lowered. It is adjusted to.

  The sliding portion 13b is composed of a disc-shaped leaf spring 13e and a block 13f. The leaf spring 13e is an annular spring member connected to the outer edge of the fixing portion 13a when viewed from the bolt 14. The leaf spring 13e is formed in a thin plate shape in the axial direction of the bolt 14 so that the leaf spring 13e is bent in the axial direction of the bolt 14 and hardly bent in the direction orthogonal to the axial direction. Such a leaf spring 13 e can be bent in the axial direction of the bolt 14. For this reason, the sliding part 13b has elasticity in the axial direction of the bolt 14 (the coupling direction of the base plate 12 and the bolted plate 13). The block 13 f is connected to the outer edge of the leaf spring 13 e, and the lower surface thereof is in contact with the upper surface of the base plate 12. This lower surface constitutes a part of the contact surface 15 where the base plate 12 and the bolted plate 13 are in contact with each other, and forms a sliding region Rd of the contact surface 15. Note that the slip region Rd is the base plate 12 when vibration is applied to the fastening structure 11 so as to move the base plate 12 and the bolted plate 13 relative to each other, like the slip region Rb of the first embodiment. And a region where the bolted plate 13 slides. As described above, the slip portion 13b is composed of a part of the bolted plate 13 whose surface is the slip region Rd.

  The contact surface 15 is a surface where the base plate 12 and the bolted plate 13 are in contact with each other. The fixing region Rc where the fixing portion 13a and the base plate 12 are in contact with each other, and the sliding portion 13b (block 13f) and the base plate 12 are in contact with each other. And a sliding region Rd.

  In the fastening structure 11 of the present embodiment, as described above, the fixing portion 13a of the bolted plate 13 has a structure that is easily deformed in the radial direction centered on the bolt 14 by being provided with the concentric circular slit 13c. . That is, in this embodiment, normally, the fixing portion 13a in which the concentric slit 13c is not formed has low rigidity in the linear direction orthogonal to the axial direction of the bolt 14 by forming the concentric slit 13c. It is adjusted to become.

  In such a fastening structure 11 according to the present embodiment, when a vibration having an amplitude in a linear direction orthogonal to the axial direction of the bolt 14 is applied, the fixing portion 13 a of the bolted plate 13 follows the displacement of the base plate 12. And easily deformed. For this reason, when a vibration having a vibration amplitude larger than a predetermined vibration amplitude considered for setting the fixing portion 13a and the sliding region 13b occurs, or when the fastening force by the bolt 14 is reduced for some reason. Even if it exists, the fixed part 13a of the bolted plate 13 becomes difficult to slide with respect to the base plate 12, and compared with the case where the rigidity of the fixed part 13a of the bolted plate 13 is not adjusted, a high fastening property can be obtained. .

  Further, in the fastening structure 11 of the present embodiment, the fixing portion 13a of the bolted plate 13 is easily deformed in the circumferential direction around the bolt 14 by providing the radial slit 13d as described above. Yes. That is, in the present embodiment, normally, the radial slit 13d is formed in the fixing portion 13a where the radial slit 13d is not formed, so that the rigidity of the fixing portion 13a is twisted around the bolt 14. It is adjusted to be lower with respect to the direction.

  Therefore, when the vibration that swings in the torsional direction around the bolt 14 is applied to the fastening structure 11 of the present embodiment, the fixing portion 13 a of the bolted plate 13 follows the displacement of the base plate 12. And deform. For this reason, when a vibration having a vibration amplitude larger than a predetermined vibration amplitude considered for setting the fixing portion 13a and the sliding region 13b occurs, or when the fastening force by the bolt 14 is reduced for some reason. Even if it exists, the fixed part 13a of the bolted plate 13 becomes difficult to slide with respect to the base plate 12, and compared with the case where the rigidity of the fixed part 13a of the bolted plate 13 is not adjusted, high fastening property can be obtained. .

  As described above, the fixing portion 13a of the bolted plate 13 is formed of a part of the bolted plate 13, and the fastening property in the fixing region Rc is improved by adjusting the rigidity of a part of the bolted plate 13. As a result, the slip portion 13b can be actively slid in the slip region Rd, and the amount of friction loss in the slip region Rd can be increased. That is, in the fastening structure 11 of the present embodiment, the fixing portion 13a of the bolted plate 13 functions as the rigidity adjusting portion of the present invention.

  According to the fastening structure 11 of the present embodiment as described above, one of the bolted plates 13 out of the base plate 12 and the bolted plate 13 to be coupled by the fixing portion 13a of the bolted plate 13 functioning as a rigidity adjusting portion. The rigidity of the part is adjusted low. As described above, the rigidity of the fixing portion 13a of the bolted plate 13 is reduced, so that the ease of sliding in the fixing region Rc that is a part of the contact surface 15 is reduced, and the fastening property between the base plate 12 and the bolted plate 13 is improved. Can be increased. Thus, by improving the fastening property between the base plate 12 and the bolted plate 13, the necessity to obtain the fastening property at the sliding portion 13b is reduced, and the base plate 12 and the bolted plate 13 are actively slid at the sliding portion 13b. It becomes possible to make it. Then, by sliding the base plate 12 and the bolted plate 13 largely at the sliding portion 13b, the amount of friction loss at the sliding portion 13b is greatly increased, and the vibration damping characteristic can be increased. According to such a fastening structure 11 of the present embodiment, the setting range of the slip amount between the base plate 12 and the bolted plate 13 in the sliding portion 13b can be widened, and the vibration damping characteristic can be arbitrarily set within the range. It becomes possible to adjust.

  Further, in the fastening structure 11 of the present embodiment, by providing the leaf spring 13e, the sliding portion 13b of the bolted plate 13 has elasticity in the connecting direction of the base plate 12 and the bolted plate 13. Therefore, the block 13f is always pressed against the upper surface of the base plate 12, and the magnitude of the vertical drag between the block 13f and the base plate 12 can be stabilized. Since the amount of friction loss generated in the slip region Rd varies depending on the magnitude of the vertical drag between the block 13f and the base plate 12, the magnitude of the vertical drag between the block 13f and the base plate 12 is stabilized by the leaf spring 13e. By doing so, the amount of friction loss can be stabilized, and the amount of vibration attenuation can always be kept constant.

  Further, in the fastening structure 11 of the present embodiment, the fixing portion 13a of the bolted plate 13 is orthogonal to the axial direction of the bolt 14 by concentric slits 13c and radial slits 13d arranged in a direction orthogonal to the axial direction of the bolt 14. In this direction, the rigidity is low, but the rigidity is maintained in the axial direction of the bolt 14. For this reason, the fastening property between the base plate 12 and the bolted plate 13 can be maintained.

  In addition, since the amount of friction loss generated in the sliding region Rd varies depending on the magnitude of the normal force between the block 13f and the base plate 12, the spring force and the displacement of the leaf spring 13e are adjusted to adjust the normal force. Thus, it is possible to easily adjust the friction loss amount generated in the slip region Rd.

  In the present embodiment, the concentric slit 13c is shallow at the central portion where the fastening force of the bolt 14 is strongly transmitted and deepened outside where the contact stress is reduced. For this reason, in the region where the contact stress is low and the limit of fixation (static friction coefficient) is low, the fixing portion 13a is more flexibly deformed and absorbs vibration, thereby reducing the shear stress acting on the fixing region Rc. Therefore, it is possible to prevent the base plate 12 and the bolted plate 13 from slipping more in the fixing region Rc.

  In the present embodiment, a configuration in which concentric slits 13c and radial slits 13d are formed with respect to the fixing portion 13a of the bolted plate 13 is employed. However, the present invention is not limited to this, and concentric slits and radial slits may be provided for the fixing portion on the base plate 12 side. In this case, the fixing portion of the base plate 12 becomes a portion where the rigidity is adjusted, and functions as a rigidity adjusting portion. Further, a plurality of linear slits may be provided in two directions perpendicular to the axial direction of the bolt 14 and perpendicular to each other, and the slits may be arranged in a lattice pattern.

  In the present embodiment, the configuration in which the bolted plate 13 includes the leaf spring 13e and the block 13f has been described. However, the present invention is not limited to this. For example, as shown in FIG. 3, the leaf spring 13 e and the block 13 f are deleted from the bolted plate 13, and an annular disc spring 16 having a lower end in contact with the base plate 12 and an upper end fixed to the bolted plate 13 is installed. You may do it. In such a case, the surface where the disc spring 16 and the base plate 12 come into contact becomes the sliding region Rd of the contact surface 15, and the disc spring 16 performs the same function as the leaf spring 13e and the block 13f. In such a case, the second member of the present invention is composed of the bolted plate 13 and the disc spring 16.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

  Fig.4 (a) is a longitudinal cross-sectional view which shows schematic structure of the fastening structure 21 of this embodiment. As shown in this figure, the fastening structure 21 of this embodiment includes a base plate 22, a bolted plate 23, and bolts 24.

  The base plate 22 is a plate material made of a metal divided so as to be able to spread in the radial direction around the bolt 24, for example, and has a bolt hole through which the bolt 24 is inserted. The bolted plate 23 is a plate material wider than the base plate 22 and has a bolt hole through which the bolt 24 is inserted. The bolts 24 are inserted into bolt holes of the base plate 22 and the bolted plate 23 that are arranged in an overlapping manner, and fasten the base plate 22 and the bolted plate 23 together. Further, in the present embodiment, the bolt 24 penetrates the base plate 22 and is screwed to the base X, whereby the base plate 22 is sandwiched between the bolted plate 23 and the base X, and the fastening structure. 21 is fixed on the base X.

  The base plate 22 includes a fixing part 22a that is a part on the bolt 24 side and a sliding part 22b that is a part outside the fixing part 22a.

  The upper surface of the fixing portion 22 a is in contact with the lower surface of the bolted plate 23. This upper surface constitutes a part of the contact surface 25 where the base plate 22 and the bolted plate 23 are in contact with each other, and forms a fixing region Re of the contact surface 25. The fixing region Re is a region in which the base plate 22 and the bolted plate 23 do not slip when the vertical vibration is applied to the fastening structure 21, as in the fixing region Ra of the first embodiment. It is. As described above, the fixing portion 22a includes a part of the base plate 22 having the fixing region Re as a surface.

  Further, as shown in FIG. 4A, the fixing portion 22 a includes a plurality of oblique slits 22 c that are inclined with respect to the axis of the bolt 24. As shown in FIG. 4A, these oblique slits 22 c are inclined so as to go outward as viewed from the bolts 24 as they go from the surface of the base plate 22 in the depth direction. In the fixing portion 22a, these oblique slits 22c reduce the rigidity in the normal direction of the oblique slits 22c (the direction perpendicular to the oblique side indicated by the cross-sectional shape of the oblique slits 22c). In other words, in the present embodiment, the rigidity of the fixing portion 22a is adjusted in two directions, that is, the coupling direction between the base plate 22 and the bolted plate 23 and the direction orthogonal to the coupling direction. When the fixing portion 22 a is pushed from the axial direction of the bolt 24, the fixing portion 22 a is deformed so as to protrude outward as viewed from the bolt 24, exceeding deformation due to the Poisson's ratio.

  The slip portion 22b includes a connecting portion 22d, a leaf spring 22e, and a block 22f. The connecting portion 22d is connected to the outer edge of the fixing portion 22a when viewed from the bolt 24, and is an annular member having high rigidity in a direction orthogonal to the axial direction of the bolt 24 so as to be pushed out by deformation of the fixing portion 22a. The leaf spring 22e is connected to the outer edge of the connecting portion 22d and is shaped so as to bend in the axial direction of the bolt 24. In addition, as shown to Fig.4 (a), the leaf | plate spring 22e is installed one each on the upper and lower sides of the connection part 22d. The block 22f is connected to the connection portion 22d via a leaf spring 22e. One block 22f is also installed above and below the connecting portion 22d. The upper surface of the block 22 f installed on the upper side of the connection portion 22 d is in contact with the lower surface of the bolted plate 23. This upper surface constitutes a part of the contact surface 25 where the base plate 22 and the bolted plate 23 are in contact with each other, and forms a sliding region Rf of the contact surface 25. Note that the slip region Rf is a region where the base plate 22 and the bolted plate 23 slide when the vertical vibration is mainly applied to the fastening structure 21, similarly to the slip region Rb of the first embodiment. As described above, the slip portion 22b is formed of a part of the base plate 22 having the slip region Rf as a surface.

  The contact surface 25 is a surface where the base plate 22 and the bolted plate 23 are in contact, the fixing region Re where the fixing portion 22a and the bolted plate 23 are in contact, and the sliding portion 22b and the bolted plate 23 are in contact. And a sliding region Rf.

  In the fastening structure 21 of the present embodiment, as described above, the fixing portion 22a of the base plate 22 has a structure that is easily deformed in the normal direction of the oblique slit 22c by including the oblique slit 22c. That is, in the present embodiment, normally, the fixing portion 22a where the oblique slit 22c is not formed has low rigidity in the normal direction of the oblique slit 22c due to the formation of the oblique slit 22c.

  In such a fastening structure 21 of the present embodiment, when a vibration that vibrates in the axial direction of the bolt 24 is applied, the fixing portion 22a of the base plate 22 is expanded and contracted in the axial direction of the bolt 24, thereby fixing the fixing portion 22a. Expands and contracts in a direction perpendicular to the axial direction of the bolt 24. For example, the fixing portion 22a extends in a direction orthogonal to the axial direction of the bolt 24 when crushed in the axial direction of the bolt 24, and contracts in a direction orthogonal to the axial direction of the bolt 24 when pulled in the axial direction of the bolt 24. . By such expansion and contraction in the direction orthogonal to the axial direction of the bolt 24 of the fixing portion 22a, the block 22f is greatly moved in the direction orthogonal to the axial direction of the bolt 24 via the connecting portion 22d and the leaf spring 22e, and the sliding region Rf The amount of friction loss at can be increased.

  As described above, the fixing portion 22a of the base plate 22 is a part of the base plate 22, and is a part of the contact surface 25 between the base plate 22 and the bolted plate 23 by adjusting the rigidity of a part of the base plate 22. Increase (change) the friction loss amount in the slip region Rf. That is, in the fastening structure 21 of the present embodiment, the fixing portion 22a of the base plate 22 functions as the rigidity adjusting portion of the present invention.

  According to the fastening structure 21 of the present embodiment as described above, the rigidity of a part of the base plate 22 is lowered in the normal direction of the oblique slit 22c by the fixing portion 22a of the base plate 22 that functions as the rigidity adjusting portion. It has been adjusted. As described above, the rigidity of the fixing portion 22a of the base plate 22 is lowered in the normal direction of the oblique slit 22c, thereby preventing the sliding at the fixing portion 22a and improving the fastening performance, and is a part of the contact surface 25. The amount of movement of the block 22f in the slip region Rf can be increased, and the amount of friction loss in the slip region Rf can be increased. Therefore, according to the fastening structure 21 of the present embodiment, it is possible to increase the amount of vibration attenuation in which the direction of the amplitude coincides with the axial direction of the bolt 24.

  In the fastening structure 21 of the present embodiment, the base plate 22 includes a block 22f on the base X side. For this reason, friction loss also occurs between the block 22f and the base X, and the attenuation amount of vibration whose amplitude direction matches the axial direction of the bolt 24 can be further increased.

  Further, in the fastening structure 21 of the present embodiment, by providing the leaf spring 22e, the sliding portion 22b of the base plate 22 has elasticity in the connecting direction of the base plate 22 and the bolted plate 23. For this reason, the block 22f is always pressed against the lower surface of the bolted plate 23, and the magnitude of the vertical drag between the block 22f and the bolted plate 23 can be stabilized. Since the amount of friction loss generated in the sliding region Rf varies depending on the magnitude of the normal force between the block 22f and the bolted plate 23, the normal force between the block 22f and the bolted plate 23 is changed by the leaf spring 22e. By stabilizing the size, the amount of friction loss can be stabilized, and the amount of vibration attenuation can always be kept constant.

  Further, since the amount of friction loss generated in the sliding region Rf changes depending on the magnitude of the vertical drag between the block 22f and the bolted plate 23, the vertical drag is adjusted by adjusting the spring constant and displacement of the leaf spring 22e. By doing so, it is possible to easily adjust the amount of friction loss generated in the slip region Rf.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

  FIG. 4B is a longitudinal sectional view showing a schematic configuration of the fastening structure 31 according to the present embodiment. As shown in this figure, the fastening structure 31 of this embodiment includes a base plate 32, a bolted plate 33, and bolts 34.

  The base plate 32 is a plate material made of, for example, a disk-shaped metal, and has a bolt hole through which a bolt 34 is inserted. The bolted plate 33 is a plate material wider than the base plate 32, and has a bolt hole through which the bolt 34 is inserted. The bolt 34 is inserted into the bolt hole of the base plate 32 and the bolted plate 33 that are arranged in an overlapping manner, and fastens the base plate 32 and the bolted plate 33. In the present embodiment, the bolt 34 penetrates the base plate 32 and is screwed to the base X, whereby the base plate 32 is sandwiched between the bolted plate 33 and the base X. 31 is fixed on the base X.

  The base plate 32 includes a fixing part 32a which is a part on the bolt 34 side and a sliding part 32b which is a part outside the fixing part 32a.

  The upper surface of the fixing portion 32 a is in contact with the lower surface of the bolted plate 33. This upper surface constitutes a part of the contact surface 35 where the base plate 32 and the bolted plate 33 are in contact with each other, and forms a fixing region Rg of the contact surface 35. The fixing region Rg is a region where the base plate 32 and the bolted plate 33 do not slip when vibration is applied to the fastening structure 31, as in the fixing region Ra of the first embodiment. As described above, the fixing portion 32a includes a part of the base plate 32 having the fixing region Rg as a surface.

  Further, the fixing portion 32a is formed of a material having a small (different) elastic modulus (for example, copper, aluminum, plastic, etc.). When the fixing portion 32a is pressed from the axial direction of the bolt 34, the fixing portion 32a is greatly deformed in the axial direction of the bolt 34, and is deformed so as to protrude outward as viewed from the bolt 34.

  The slip portion 32b is composed of a leaf spring 32c and a block 32d. The leaf spring 32c is connected to the outer edge of the fixing portion 32a, and is shaped so as to bend in the axial direction of the bolt 34. In addition, as shown in FIG.4 (b), the leaf | plate spring 32c is spaced apart in the axial direction of the volt | bolt 34, and is installed one each up and down. The block 32d is connected to the fixing part 32a via the leaf spring 32c. The blocks 32d are also installed one above the other. The upper surface of the block 32 d installed on the upper side is in contact with the lower surface of the bolted plate 33. This upper surface constitutes a part of the contact surface 35 where the base plate 32 and the bolted plate 33 are in contact with each other, and forms a sliding region Rh of the contact surface 35. Note that the slip region Rh is a region where the base plate 32 and the bolted plate 33 slide when vibration is applied to the fastening structure 31, similarly to the slip region Rb of the first embodiment. As described above, the slip portion 32b is formed of a part of the base plate 32 having the slip region Rh as a surface.

  The contact surface 35 is a surface where the base plate 32 and the bolted plate 33 are in contact with each other. The fixing region Rg where the fixing portion 32a and the bolted plate 33 are in contact with each other, and the sliding portion 32b and the bolted plate 23 are in contact with each other. And a sliding region Rh.

  In the fastening structure 31 of the present embodiment, the fixing portion 32a of the base plate 32 is adjusted to be low in rigidity by being formed of a material having a low elastic modulus as described above, and the axial direction of the bolt 34 When it is pressed, it protrudes greatly in the direction orthogonal to the axial direction of the bolt 34. In other words, in the present embodiment, the rigidity of the fixing portion 32a is adjusted to include two directions, that is, the coupling direction between the base plate 32 and the bolted plate 33 and the direction orthogonal to the coupling direction.

  In the fastening structure 31 according to the present embodiment, when a vibration that vibrates in the axial direction of the bolt 34 is applied, the fixing portion 32a of the base plate 32 is expanded and contracted in the axial direction of the bolt 34, thereby fixing the fixing portion 32a. Expands and contracts in a direction perpendicular to the axial direction of the bolt 34. For example, the fixing portion 32a extends in a direction orthogonal to the axial direction of the bolt 34 when crushed in the axial direction of the bolt 34, and contracts in a direction orthogonal to the axial direction of the bolt 34 when pulled in the axial direction of the bolt 34. . By such expansion and contraction in the direction orthogonal to the axial direction of the bolt 34 of the fixing portion 32a, the block 32d is greatly moved in the direction orthogonal to the axial direction of the bolt 34 via the leaf spring 32c, and the friction loss amount in the sliding region Rh Can be increased.

  As described above, the fixing portion 32a of the base plate 32 is a part of the base plate 32, and is a part of the contact surface 35 between the base plate 32 and the bolted plate 33 by adjusting the rigidity of a part of the base plate 32. Increase (change) the amount of friction loss in the slip region Rh. That is, in the fastening structure 31 of the present embodiment, the fixing portion 32a of the base plate 32 functions as the rigidity adjusting portion of the present invention.

  According to the fastening structure 31 of the present embodiment as described above, the rigidity of a part of the base plate 32 is adjusted by the fixing portion 32a of the base plate 32 that functions as a rigidity adjusting portion. As the rigidity of the fixing portion 32a of the base plate 32 is thus reduced, the amount of movement of the block 32d in the sliding region Rh that is a part of the contact surface 35 can be increased, and the amount of friction loss in the sliding region Rh can be increased. . Therefore, according to the fastening structure 31 of the present embodiment, it is possible to increase the attenuation amount of the vibration whose amplitude direction matches the axial direction of the bolt 34.

  In the fastening structure 31 of the present embodiment, the base plate 32 includes a block 32d on the base X side. For this reason, friction loss also occurs between the block 32d and the base X, and the amount of vibration attenuation in which the direction of the amplitude coincides with the axial direction of the bolt 34 can be further increased.

  Further, in the fastening structure 31 of the present embodiment, by providing the leaf spring 32 c, the sliding portion 32 b of the base plate 32 has elasticity in the connecting direction of the base plate 32 and the bolted plate 33. For this reason, the block 32d is always pressed against the lower surface of the bolted plate 33, and the magnitude of the vertical drag between the block 32d and the bolted plate 33 can be stabilized. Since the amount of friction loss generated in the sliding region Rh varies depending on the magnitude of the normal force between the block 32d and the bolted plate 33, the leaf spring 32c causes the normal force between the block 32d and the bolted plate 33 to increase. By stabilizing the size, the amount of friction loss can be stabilized, and the amount of vibration attenuation can always be kept constant.

  In addition, since the amount of friction loss generated in the sliding region Rh varies depending on the magnitude of the normal force between the block 32d and the bolted plate 33, the normal force is adjusted by adjusting the spring constant and displacement of the leaf spring 32c. It is possible to easily adjust the amount of friction loss generated in the slip region Rh.

(Fifth embodiment)
In the third and fourth embodiments, when the amplitude direction of the applied vibration is the axial direction of the bolt, the vibration direction is converted into a direction orthogonal to the axial direction of the bolt by the fixing portion, thereby causing the slip. In this configuration, the slip amount in the region is increased. As another form of such a configuration, a form as shown in FIG.

  A fastening structure 41 shown in FIG. 5A includes a base plate 42, a bolted plate 43, an elastic member 44, a disc spring 45, a block 46, and a bolt 47. In the present embodiment, the bolted plate 43, the elastic member 44, the disc spring 45, and the block 46 are integrated to form a collective structure 49 (second member in the present invention).

  The base plate 42 is a plate material made of, for example, a disk-like metal, and has a bolt hole through which a bolt 47 is inserted. The bolted plate 43 is a plate material smaller than the base plate 42 and has a bolt hole through which a bolt 47 is inserted. The bolt 47 is inserted into the bolt hole of the base plate 42 and the bolted plate 43, and the bolted plate 43, the elastic member 44, the disc spring 45, and the aggregate structure 49 of the block 46 and the bolted plate 43 are connected. It is concluded.

  The elastic member 44 is a tubular member having a bellows 44 a and is disposed between the base plate 42 and the bolted plate 43 in a state of being fixed to the bolted plate 43 so as to surround the bolt 47. The elastic member 44 can be expanded and contracted only by the bellows 44 a in the axial direction of the bolt 47. In other words, the elastic member 44 has a structure having low rigidity in the axial direction of the bolt 47 and high rigidity in a direction orthogonal to the axial direction of the bolt 47. The lower surface of the elastic member 44 is in contact with the upper surface of the base plate 42. The lower surface of the elastic member 44 constitutes a part of the contact surface 48 between the collective structure 49 and the base plate 42, and is a fixing region Ri. Note that the fixing region Ri is a region where the assembly structure 49 and the base plate 42 do not slip when vibration is applied to the fastening structure 41, similarly to the fixing region Ra of the first embodiment. Thus, the elastic member 44 is a part of the aggregate structure 49 and has the fixing region Ri as a surface.

  The disc spring 45 is disposed outside the elastic member 44 when viewed from the bolt 47, and its upper end is fixed to the bolted plate 43. The disc spring 45 is shaped so that its longitudinal section is inclined in the axial direction of the bolt 47. The disc springs 45 arranged obliquely as described above can be said to be members whose rigidity in the normal direction of the hypotenuse indicated by the cross-sectional shape is low and whose rigidity in the direction orthogonal to the normal direction is adjusted to be high. When such a disc spring 45 is pushed from the axial direction of the bolt 47, the outer edge (lower end) side is deformed so as to spread outward as seen from the bolt 47. The block 46 is connected to the outer edge of the disc spring 45, and the lower surface thereof is in contact with the upper surface of the base plate 42. This lower surface constitutes a part of the contact surface 48 between the base plate 42 and the aggregate structure 49, and forms a sliding region Rj of the contact surface 48. Note that the slip region Rj is a region where the base plate 42 and the collective structure 49 slide when vibration is applied to the fastening structure 41, similarly to the slip region Rb of the first embodiment. As described above, the disc spring 45 and the block 46 are formed of a part of the aggregate structure 49, and the block 46 has the slip region Rj as a surface.

  The contact surface 48 is a surface where the collective structure 49 and the base plate 42 are in contact with each other, a fixing region Ri where the elastic member 44 and the base plate 42 are in contact, and a sliding region Rj where the block 46 and the base plate 42 are in contact with each other. It is composed of

  In such a fastening structure 41 of the present embodiment, the outer edge of the disc spring 45 moves in a direction orthogonal to the axial direction of the bolt 47 when vibration that swings in the axial direction of the bolt 47 is applied. For example, the outer edge of the disc spring 45 moves so as to expand in a direction orthogonal to the axial direction of the bolt 47 when crushed in the axial direction of the bolt 47, and the axial direction of the bolt 47 when pulled in the axial direction of the bolt 47. It moves so that it shrinks in the direction orthogonal to. By such movement of the outer edge of the disc spring 45, the block 46 is greatly moved in the direction orthogonal to the axial direction of the bolt 47 via the disc spring 45, and the amount of friction loss in the sliding region Rj can be increased.

  In this way, the disc spring 45 included in the assembly structure 49 adjusts the rigidity of a part of the assembly structure 49, so that the disc spring 45 is part of the contact surface 48 between the assembly structure 49 and the base plate 42. The friction loss amount in a certain sliding region Rj is increased (changed). That is, in the fastening structure 41 of the present embodiment, the disc spring 45 functions as the rigidity adjusting portion of the present invention.

  According to the fastening structure 41 of the present embodiment as described above, the rigidity of a part of the collective structure 49 is adjusted by the disc spring 45 that functions as a rigidity adjusting unit. By changing the rigidity of a part of the aggregate structure 49 in this way, the amount of movement of the block 46 in the sliding region Rj that is a part of the contact surface 48 can be increased, and the amount of friction loss in the sliding region Rj can be increased. it can. Therefore, according to the fastening structure 41 of the present embodiment, it is possible to increase the amount of vibration attenuation in which the direction of the amplitude coincides with the axial direction of the bolt 47.

  Further, in the fastening structure 41 of the present embodiment, the collective structure 49 has elasticity in the connecting direction of the base plate 42 and the collective structure 49 by the disc spring 45. For this reason, the block 46 is always pressed against the upper surface of the base plate 42, and the magnitude of the vertical drag between the block 46 and the base plate 42 can be stabilized. Since the amount of friction loss generated in the sliding region Rj varies depending on the magnitude of the vertical drag between the block 46 and the base plate 42, the disc spring 45 stabilizes the magnitude of the vertical drag between the block 46 and the base plate 42. By doing so, the amount of friction loss can be stabilized, and the amount of vibration attenuation can always be kept constant.

  Further, since the amount of friction loss generated in the slip region Rj varies depending on the magnitude of the vertical drag between the block 46 and the base plate 42, the upper thrust drag is adjusted by adjusting the spring constant and displacement of the disc spring 45. And the amount of friction loss generated in the sliding region Rj can be easily adjusted.

  Further, in the fastening structure 41 of the present embodiment, the elastic member 44 includes a bellows 44 a for expanding and contracting in the axial direction of the bolt 47. For this reason, the bolted plate 43 can be moved greatly with respect to the base plate 42 when the vibration that is amplified in the axial direction of the bolt 47 is applied, the amount of deflection of the disc spring 45 is increased, and the movement of the block 46 is increased. A larger amount can be secured. Therefore, it is possible to further increase the amount of friction loss that occurs in the slip region Rj.

  Further, for example, the elastic member 44 can be formed of a material having a low elastic modulus like the fixing portion 3a of the first embodiment. As a result, it becomes a fixing portion that allows all vibrations of up and down, left and right, front and rear, and rotation, and it is possible to ensure a large amount of movement of the disc spring 45 and the block 46 no matter what vibration is applied. And a large friction loss can be obtained in the sliding region Rj.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. In the description of the present embodiment, the description of the same parts as those of the first embodiment is omitted or simplified.

  FIG.5 (b) is a longitudinal cross-sectional view which shows schematic structure of the fastening structure 51 of this embodiment. As shown in FIG. 5 (b), the fastening structure 51 of this embodiment includes a base plate 52, a bolted plate 53, and bolts 54.

  The base plate 52 is a plate material made of, for example, a disk-shaped metal, and has a bolt hole through which a bolt 54 is inserted. The bolted plate 53 is a plate material smaller than the base plate 52 and has a bolt hole through which a bolt 54 is inserted. The bolts 54 are inserted into bolt holes of the base plate 52 and the bolted plate 53 that are arranged in an overlapping manner, and fasten the base plate 52 and the bolted plate 53 together.

  The bolted plate 53 includes an inner part 53a that is a part on the bolt 54 side and an outer part 53b that is a part outside the inner part 53a. The lower surface of the inner portion 53 a is in contact with the upper surface of the base plate 52. This lower surface constitutes a part of the contact surface 55 where the base plate 52 and the bolted plate 53 come into contact. The lower surface of the outer portion 53 b is in contact with the upper surface of the base plate 52. This lower surface constitutes a part of the contact surface 55 where the base plate 52 and the bolted plate 53 come into contact. Further, as shown in FIG. 5B, the outer portion 53b includes a plurality of concentric slits 53c on the lower surface side. The concentric slits 53 c are annular slits centered on the bolt 54, and a plurality of concentric slits 53 c are arranged in the radial direction centered on the bolt 54.

  Such an outer portion 53b has a structure that is easily deformed in the radial direction centered on the bolt 54 by including the concentric slit 53c. In other words, the outer portion 53b has low rigidity in the radial direction centered on the bolt 54 (direction perpendicular to the axial direction of the bolt 54, which is the connecting direction of the base plate 52 and the bolted plate 53), due to the concentric slit 53c. It is adjusted as follows.

  In the fastening structure 51 of the present embodiment, as described above, the outer portion 53b of the bolted plate 53 has a structure that is easily deformed in the radial direction around the bolt 54 by including the concentric circular slit 53c. . That is, in the present embodiment, normally, the outer portion 53b where the concentric slit 53c is not formed has low rigidity in the linear direction perpendicular to the axial direction of the bolt 54 by forming the concentric slit 53c. It is adjusted to become.

  In such a fastening structure 51 of the present embodiment, the outer portion 53 b of the bolted plate 53 follows the displacement of the base plate 52 when a vibration that vibrates in a linear direction orthogonal to the axial direction of the bolt 54 is applied. And easily deformed. For this reason, it is difficult for the outer portion 53b of the bolted plate 53 to slide relative to the base plate 52, and the entire contact surface 55 becomes the fixing region Rk. The fixing region Rk is a region where the bolted plate 53 and the base plate 52 do not slip when vibration is applied to the fastening structure 51, like the fixing region Ra of the first embodiment.

  As described above, the outer portion 53b of the bolted plate 53 includes a part of the bolted plate 53, and by adjusting the rigidity of a part of the bolted plate 53, friction between the outer portion 53b, the base plate 52, and the contact area is achieved. Reduce (change) the amount of loss. That is, in the fastening structure 51 of the present embodiment, the outer portion 53b of the bolted plate 53 functions as the rigidity adjusting portion of the present invention.

  According to the fastening structure 51 of the present embodiment as described above, one of the bolted plates 53 out of the base plate 52 and the bolted plate 53 to be coupled by the outer portion 53b of the bolted plate 53 that functions as a rigidity adjusting portion. The rigidity of the part is adjusted low. As described above, the rigidity of the outer portion 53b of the bolted plate 53 is reduced, so that the slippage in the contact portion with the outer portion 53b, the base plate 52 is reduced, and the vibration damping characteristics in the fastening structure 51 of the present embodiment are reduced. It can be lowered. According to such a fastening structure 51 of the present embodiment, it is possible to transmit vibrations applied from the outside to other members without being attenuated.

  As the contact pressure decreases, the interval between the concentric slits 53c is narrowed toward the outside as shown in FIG. 6A, or the depth of the concentric slits 53c is increased as shown in FIG. 6B. You may let them. Further, the arrangement interval of the concentric slits 53c may be constant, and the slit width may be increased toward the outside.

  In addition to the concentric slits 53c, radial slits may be provided on the lower surface of the outer portion 53b. This reduces the rigidity of the outer portion 53b also in the torsional direction centered on the bolt 54. Therefore, even if the fastening structure 51 of the present embodiment is subjected to vibration that swings in the torsional direction centered on the bolt 54, slippage occurs in the contact region between the outer portion 53b and the base plate 52. It is possible to prevent the vibration damping characteristics of the fastening structure 51 of the present embodiment from being lowered.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, in the said embodiment, the fastening structure body in which two members were fastened with the volt | bolt was demonstrated. However, the present invention is not limited to this, and the present invention can be applied to a general joined structure in which two members are joined by other methods such as rivets, an adhesive, and welding.

  Further, as shown in FIG. 7, in the second embodiment, for example, the lower portion of the sliding portion 13b may be a diaphragm-like leaf spring structure 13g. Even in such a structure, the fastening portion 13a has low rigidity in the horizontal direction (the direction orthogonal to the axis of the bolt 14), thereby improving the fastening performance, and the sliding portion 13g in the vertical direction (the axial direction of the bolt 14). By having low rigidity, it is possible to stably obtain a large amount of friction loss.

  DESCRIPTION OF SYMBOLS 1 ... Fastening structure (joining structure), 2 ... Base plate (1st member), 2a ... Adhering part, 2b ... Sliding part, 3 ... Bolted plate (2nd member), 3a ... Adhering Part 3b ... Sliding part 4 ... Bolt 5 ... Contact surface 11 ... Fastening structure (joining structure) 12 ... Base plate (first member) 13 ... Bolted plate (second Member), 13a... Fixed portion, 13b... Sliding portion, 13c... Concentric slit, 13d... Radial slit, 13e... Leaf spring, 13f. 15 ... Contact surface, 21 ... Fastening structure (bonding structure), 22 ... Base plate (first member), 22a ... Fixed part, 22b ... Sliding part, 22c ... Slit, 22d ... Connecting part , 22e ... , 22f... Block, 23... Bolted plate, 24... Bolt, 25 .. Contact surface, 31... Fastening structure (joint structure), 32 ... Base plate (first member), 32a. Part, 32b ... Slip part, 32c ... Plate spring, 32d ... Block, 33 ... Bolted plate (second member), 34 ... Bolt, 35 ... Contact surface, 41 ... Fastening structure, 42 ...... Base plate (first member), 43... Bolted plate, 44 .. elastic member, 44 a .. bellows, 45 .. disc spring, 46 ....... block, 47 .. bolt, 48. ... Assembly structure (second member), 51 ... Fastening structure (joint structure), 52 ... Base plate (first member), 53 ... Bolted plate (second member), 53a ... Inside part , 53b ...... outside 53c... Concentric slit, 54... Bolt, 55 .. contact surface, Ra... Fixed region, Rb... Slip region, Rc... Fixed region, Rd. Rf: slip region, Rg: fixing region, Rh: slip region, Ri: fixing region, Rj: slip region, Rk: fixing region, X: base

Claims (8)

A coupling structure comprising a first member and a second member coupled in contact with the first member,
It consists of a part of the first member or the second member, and at least a contact surface between the first member and the second member by adjusting the rigidity of the part of the first member or the second member. A coupling structure comprising a rigidity adjusting portion that can change a friction loss amount in a part.   2. The coupling structure according to claim 1, wherein the rigidity adjusting unit adjusts rigidity in a coupling direction of the first member and the second member or in a direction orthogonal to the coupling direction. The contact surface is a fixed region where the first member and the second member do not slip when vibration is applied to move the first member and the second member relative to each other; It is divided into a sliding area where the second member slides,
The coupling structure according to claim 1, wherein the rigidity adjusting portion is provided at a fixing portion having the fixing region as a surface.   The coupling structure according to claim 3, wherein a rigidity in a sliding direction of a sliding part having the sliding region as a surface is higher than a rigidity in a sliding direction of the rigidity adjusting portion.   The coupling structure according to claim 3 or 4, wherein the sliding portion has elasticity in the coupling direction.   The coupling structure according to any one of claims 3 to 5, wherein the rigidity adjusting unit includes a plurality of slits arranged in an amplitude direction of the vibration, and improves fastening characteristics at the fixing portion.   The rigidity adjusting portion is made of a material having an elastic modulus different from that of the forming material of the first member or the second member abutting through a contact surface, and the friction at the sliding portion is adjusted by adjusting the slip amount at the sliding portion. The coupling structure according to any one of claims 3 to 5, wherein the loss amount is changed.   The coupling structure according to claim 7, wherein the rigidity adjusting portion has an elastic modulus in a coupling direction between the first member and the second member that is different from an elastic modulus in a direction orthogonal to the coupling direction. .

Images