JPWO2017126692A1 - Sliding bearing device - Google Patents

Abstract

  The sliding bearing device is interposed between the lower structure and the upper structure disposed above the lower structure, and is fixed to one of the upper structure and the lower structure, and the sliding bearing body. A first sliding member provided and having a sliding surface with respect to the other of the upper structure and the lower structure; and interposed between the sliding support body and the first sliding member, and holding the first sliding member; And a holding member provided with a through hole (deformation allowing portion) that allows the member to be deformed in a direction away from the other of the upper structure and the lower structure.

Description

  The present disclosure relates to a sliding bearing device.

  Japanese Patent Laid-Open No. 2001-59544 discloses a seismic isolation system in which a first sliding member and a second sliding member made of a low friction resin mainly composed of tetrafluoroethylene resin are brought into surface contact with each other so as to be slidable relative to each other. A sliding bearing for the device is disclosed. The first sliding member includes a plurality of openings having the same area in an arbitrary cross section that is open on the first sliding surface that is the upper surface of the first sliding member and that is in contact with the second sliding member and that is parallel to the opening and the first sliding surface. The bottomed hole is provided. Each bottomed hole is filled with a fluid lubricant, and a lubricant film is formed on the contact surface due to the seepage of the lubricant, thereby reducing the friction coefficient.

  Japanese Patent Laid-Open No. 2002-81496 discloses a slip isolation device that uses a slip material in which a fibrous compounding agent is blended with a polytetrafluoroethylene (PTFE) resin. Furthermore, Japanese Patent Application Laid-Open No. 2003-253073 discloses an abrasion resistant resin composition in which a filler such as fiber and a polymer resin are mixed with crosslinked PTFE. Japanese Patent Application Laid-Open No. 2013-32484 discloses a resin composition containing a fluororesin and polyester, a molded body formed from the resin composition, and a sliding member formed using the molded body. Yes.

  However, as in the conventional example described in the above-mentioned JP-A-2001-59544, in order to provide a bottomed hole for the first sliding member mainly composed of resin, a dedicated mold can be used, It is necessary to drill holes in the resin. Further, in such a sliding bearing, the first sliding member that receives the load of the building is deformed by the vertical load, but is lubricated so that the lubricant is not scraped off by the deformed portion of the outer edge and the friction does not increase. It is necessary to adjust the amount of the agent used.

  In view of the above fact, the present disclosure aims to maintain the low frictional property of the first sliding member over a long period of time.

  A sliding bearing device according to the present disclosure is interposed between a lower structure and an upper structure disposed above the lower structure, and is fixed to one of the upper structure and the lower structure. A main body, a first sliding member provided on the sliding bearing body and having a sliding surface with respect to the other of the upper structure and the lower structure, and interposed between the sliding bearing body and the first sliding member; And a holding member provided with a deformation allowing portion that holds the first sliding member and allows the first sliding member to be deformed in a direction away from the other of the upper structure and the lower structure. .

  According to the sliding bearing device according to the present disclosure, it is possible to obtain an excellent effect that the low friction property of the first sliding member can be maintained over a long period of time.

It is sectional drawing which shows the sliding bearing apparatus which concerns on 1st Embodiment. It is a principal part expanded sectional view which shows the sliding bearing apparatus which concerns on 1st Embodiment. It is a front view which shows the holding member in which the through-hole was provided in one place of the center part. It is a front view which shows the holding member in which the through-hole was provided in the several places of a peripheral part. It is a diagram which shows the repetition number of the friction which concerns on Test Example 1, and the change of a friction coefficient. It is a schematic diagram which shows the sliding bearing apparatus which concerns on 2nd Embodiment. It is an enlarged view which shows the A section of FIG. It is an enlarged view which shows the comparative example corresponded to the A section of FIG. In 2nd Embodiment, it is a figure which shows the pressure sensitive paper which was pinched | interposed and pressed between the 2nd sliding member and the 1st sliding member. In a comparative example, it is a figure which shows the pressure sensitive paper pinched and pressurized between the 2nd sliding member and the 1st sliding member. It is a figure which shows the repetition friction characteristic of 2nd Embodiment and a comparative example, and is a figure which shows the comparison on the basis of the sliding friction coefficient of the 1st cycle. It is a figure which shows the repetition friction characteristic of 2nd Embodiment and a comparative example, and is a figure which shows the comparison on the basis of the friction coefficient of the 3rd cycle. It is a figure which shows the comparison of the friction coefficient ratio when the sliding friction coefficient is set to 1 in the hysteresis curve of 2nd Embodiment and a comparative example. It is a figure which shows the comparison of a friction coefficient in the hysteresis curve of 2nd Embodiment and a comparative example.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[First Embodiment]
In FIG. 1, a sliding bearing device 10 according to the present embodiment includes a sliding bearing body 12, a first sliding member 14, and a holding member 16.

  The sliding bearing body 12 is interposed between the lower structure 18 and the upper structure 20 disposed above the lower structure 18, and is attached to one of the upper structure 20 and the lower structure 18, for example, the upper structure 20. Fixed. The upper structure 20 is a supported body such as a building, a tank, or a water tank. The lower structure 18 is a foundation portion made of, for example, concrete and is installed on the ground (not shown).

  The sliding bearing body 12 is configured by fixing an upper mounting plate 26 to the upper end of the laminate 22 and fixing a connecting plate 28 to the lower end. The laminated body 22 is formed in a cylindrical shape by alternately laminating a plurality of disk-shaped metal plates 30 and a plurality of disk-shaped rubbers 34 in the thickness direction, and the center of the upper mounting plate 26. Is arranged. The metal plate 30 is a steel plate, for example. The metal plate 30 and the rubber 34 are firmly integrated by vulcanization adhesion. Thereby, it has a predetermined rigidity with respect to a load in the vertical direction (arrow V direction), and exerts a spring function and secures a predetermined deformation amount with respect to a load in the horizontal direction (arrow H direction). It is possible.

  The upper mounting plate 26 and the connecting plate 28 are each made of a thick disk-shaped steel plate. The outer diameter of the upper mounting plate 26 is larger than the outer diameter of the sliding bearing body 12, and is bolted to the upper structure 20 (not shown). The outer diameter of the connecting plate 28 is set to be equal to the outer diameter of the metal plate 30, and a covering rubber 36 is arranged in a cylindrical shape on the outer periphery of the laminate 22 and the connecting plate 28. Since the outer edge of the metal plate 30 is covered with the covering rubber 36, the metal plate 30 and the connecting plate 28 are not exposed to the outside, and their deterioration is prevented.

  In FIG. 1, the sliding bearing body 12 receives a load from the upper structure 20, and the rubber 34 is slightly compressed and deformed so that the length in the vertical direction is shorter than that in the unloaded state. In this state, when the upper structure 20 moves relative to the lower structure 18 in the horizontal direction, the vibration energy of this relative movement is partially absorbed by the shear deformation of the sliding bearing body 12.

  The first sliding member 14 is a low friction member provided on the sliding bearing body 12 and having a sliding surface 14 </ b> A for the other of the upper structure 20 and the lower structure 18. The material of the first sliding member 14 is, for example, a low friction resin mainly composed of tetrafluoroethylene resin. The first sliding member 14 is provided, for example, on the lower end side of the sliding bearing body 12 via the holding member 16.

  The material of the first sliding member 14 is, for example, one of the following (1) to (5). These are formulations that can reduce both the friction coefficient of the first sliding member 14 and the mechanical strength.

(1) A tetrafluoroethylene resin composition containing an aromatic polyester or polyimide.
(2) A tetrafluoroethylene resin composition containing 5 to 30 wt% of aromatic polyester.
(3) A tetrafluoroethylene resin composition containing 5 to 30 wt% of polyimide.
(4) In any one of the above 1) to 3), further containing at least one of carbon fiber, graphite, glass fiber, molybdenum disulfide, potassium titanate, and bronze.
(5) In any one of the above 1) to 3), further containing one or more of carbon fiber, graphite, glass fiber, molybdenum disulfide, potassium titanate, and bronze exceeding 0 and not exceeding 5 to 20 wt% .
In the above (4) and (5), graphite and molybdenum disulfide are preferable to other materials from the viewpoint of friction characteristics.

  The friction coefficient of the first sliding member 14 when the surface pressure is 20 MPa is, for example, 0.01 or less, and more preferably 0.08 or less. The amount of compressive strain of the first sliding member 14 when the surface pressure is 80 MPa is, for example, 40% or less.

  The first sliding member 14 is formed in a disk shape, for example, and is fitted in the recess 16 </ b> A of the holding member 16. Therefore, the outer diameter of the first sliding member 14 is smaller than the outer diameter of the holding member 16. Further, the recess 16A is formed shallower than the thickness of the first sliding member 14. Thereby, the first sliding member 14 protrudes below the holding member 16. The first sliding member 14 is fixed to the holding member 16 by, for example, adhesion. Further, the outer diameter of the first sliding member 14 is not limited to the case where it is smaller than the outer diameter of the holding member 16, and the outer diameter of the first sliding member 14 may be substantially equal to the outer diameter of the holding member 16. It may be larger than the outer diameter of the member 16.

  The holding member 16 is interposed between the sliding bearing body 12 and the first sliding member 14 and holds the first sliding member 14. The holding member 16 is made of a metal such as stainless steel, and is formed in a disk shape. A circular recess 16A into which the first sliding member 14 is fitted is formed at the lower end of the holding member 16 (the end portion on the first sliding member 14 side). The holding member 16 is engaged with the connecting plate 28 in the horizontal direction via, for example, a key plate 38. The holding member 16 may be fastened to the connecting plate 28 with a bolt or the like (not shown).

  The holding member 16 has a plurality of through holes 40 as deformation allowing portions that allow the first sliding member 14 to deform in the direction away from the other of the upper structure 20 and the lower structure 18, for example, the lower structure 18. Is provided. The through hole 40 is, for example, a circular hole.

  As shown in FIG. 3A, the through hole 40 may be provided at one position in the holding member 16 corresponding to the center portion of the first sliding member 14. Further, as shown in FIG. 3B, the through-hole 40 is, for example, at eight positions (a plurality of positions) along the circumferential direction of the holding member 16 at positions corresponding to the peripheral edge of the first sliding member 14 in the holding member 16. ) May be provided. In the case where one through hole 40 is provided, it is desirable to make the diameter larger than in the case where a plurality of through holes 40 are provided.

  The other of the upper structure 20 and the lower structure 18 is provided with a second sliding member 24 having a sliding surface 24 </ b> A with respect to the first sliding member 14. The material of the second sliding member 24 is, for example, the same as that of the first sliding member 14, but stainless steel or the like can also be used. As shown in FIG. 2, a lubricant 42 is disposed between the first sliding member 14 and the second sliding member 24. The lubricant 42 mainly accumulates in the dimple 44 and the second sliding member 24 formed at the position of the through hole 40.

(Function)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 1, the sliding support device 10 according to the present embodiment is fixed to one of the upper structure 20 and the lower structure 18, for example, the upper structure 20, and between the upper structure 20 and the lower structure 18. Intervene. Then, a load acts on the lower structure 18 from the upper structure 20 through the sliding support body 12, and the first sliding member 14 held by the holding member 16 receives a compressive load.

  At this time, as shown in FIG. 2, since the through hole 40 of the holding member 16 is not in contact with the first sliding member 14, a part of the compressed first sliding member 14 is in the through hole 40. Deforms to enter. Since the outer edge of the first sliding member 14 is fitted in the recess 16A of the holding member 16, the first sliding member 14 is prevented from spreading outside the recess 16A. Therefore, it deform | transforms so that a part of 1st sliding member 14 may enter also into the through-hole 40 of the peripheral part of the holding member 16. FIG.

  Thereby, the 1st sliding member 14 deform | transforms in the direction away from the lower structure 18 in this embodiment in the other of the upper structure 20 and the lower structure 18 in the position of the through-hole 40. FIG. As a result, a dimple 44 capable of storing the lubricant 42 is formed between the first sliding member 14 and the second sliding member 24 (the other of the lower structure 18). In the example shown in FIG. 1, a plurality of through holes 40 are provided, so that a plurality of dimples 44 are also formed. Since the dimple 44 is naturally formed at a position corresponding to the through hole 40 of the holding member 16 when the first sliding member 14 receives a compressive load, a dedicated die is used to provide the dimple 44. There is no need to post-process the first sliding member 14.

  In the present embodiment, since the deformation allowing portion is the through hole 40, the deformation allowing portion can be easily provided when the first sliding member 14 is formed, and even when the deformation allowing portion is provided in the post-processing, the processing is easy. It is. Further, since the through hole 40 is a circular hole, the through hole 40 can be easily formed by drilling or the like.

  In the present embodiment, since the lubricant 42 is accumulated between the dimple 44 formed on the first sliding member 14 and the second sliding member 24, the lubricant 42 is between the first sliding member 14 and the second sliding member 24. Low friction can be maintained over a long period of time. When the upper structure 20 moves due to an action such as an earthquake, the first sliding member 14 slides with respect to the second sliding member 24, thereby reducing the horizontal acceleration acting on the upper structure 20. it can. At this time, the lubricant 42 in the dimple 44 is supplied between the sliding surface of the first sliding member 14 and the sliding surface of the second sliding member 24. When the first sliding member 14 slides with respect to the second sliding member 24, the horizontal acceleration acting on the upper structure 20 can be reduced.

  As shown in FIG. 3A, when the through hole 40 is provided in the central portion of the holding member 16, a dimple 44 capable of storing the lubricant 42 is formed in the central portion of the first sliding member 14. Is done. In addition, as shown in FIG. 3B, when the through holes 40 are provided at a plurality of locations of the holding member 16, dimples 44 that can store the lubricant 42 are formed at a plurality of locations of the first sliding member 14. Is done.

  In the sliding support device 10 according to the present embodiment, the first sliding member 14 slides with respect to the lower structure 18, but the first sliding member 14 is turned upside down so that the first sliding member 14 is the upper structure 20. It is good also as a structure which slides with respect to.

  The shape of the through hole 40 is not limited to a circle, and may be an ellipse, an oval, a polygon, or the like. Further, the deformation allowing portion is not limited to the through hole 40 and may be a non-penetrating recess. This recess can be shaped like a cylinder, a cone, a groove or the like.

  A sliding surface for the first sliding member 14 may be provided on the other of the upper structure 20 and the lower structure 18 without providing the second sliding member 24.

(Test Example 1)
The case where the holding member having the configuration shown in FIG. 3A is used, the case where the holding member having the configuration shown in FIG. 3B is used, and the holding member (not shown) having no through hole, The amount of change of the friction coefficient with respect to the number of repetitions of sliding (sliding) of one sliding member was examined.

  In the holding member having the configuration shown in FIG. 3A, one through hole having a diameter of 8 mm is provided at the central portion of the recess. In the holding member 16 shown in FIG. 3B, eight through-holes having a diameter of 2.8 mm are equally provided in the peripheral portion of the recess. The pitch circle diameter of this through hole is 80 mm.

  The material of the first sliding member is a resin mainly composed of tetrafluoroethylene resin, and the material of the second sliding member is SUS404. The dimensions of the first sliding member and the second sliding member are as shown in Table 1. The amount of lubricant used is 2.5 g. The test conditions are as shown in Tables 2 and 3. The test results are as shown in FIG. From FIG. 4, when the through hole is not provided in the holding portion, the amount of change in the friction coefficient increases with an increase in the number of repetitions, but when the through hole is provided in the holding portion, the repetition is repeated. It can be seen that even if the number increases, the amount of change in the friction coefficient is small. Particularly, in the case of a through hole having a diameter of 8 mm, the amount of change in the friction coefficient is smaller than that in the case of a through hole having a diameter of 2.8 mm. Therefore, the diameter of the through hole is preferably 8 mm rather than 2.8 mm.

  When the through hole is not provided in the holding part, the coefficient of friction increases as the number of repetitions increases. However, when the through part is provided in the holding part, the number of repetitions increases. Even so, the coefficient of friction is kept low.

(Test Example 2)
In Tables 4 to 6, the difference in the coefficient of friction and the amount of compressive strain due to the difference in the composition of the first holding member was tested. Common test conditions are as follows.

Base resin: Polytetrafluoroethylene (tetrafluoroethylene resin, PTFE)
<Friction test>
Tester: Dynamic friction tester Material of second sliding member: SUS304
Surface pressure: 20 MPa
Speed: 100mm / s
Amplitude: 200 mm
<Compression strain>
Tester: Compression tester Surface pressure: 80MPa
Speed: 1.3mm / min
Specimen shape: 30mm diameter x 5mm thickness

The test conditions that are not common are as follows.
Lubricant: Silicone oil

  The target value of the friction coefficient is 0.01 or less. The target value for the amount of compressive strain is 40% or less. It is desirable that both the target value of the friction coefficient and the target value of the amount of compressive strain are satisfied. The amount of compressive strain was defined as ((d1-d2) / d1) × 100 (%). Here, d1 is the thickness before the test of the first holding member, and d2 is the thickness after the test of the first holding member.

  From Table 4 and Table 5, even if the material mix | blended with a 1st holding member is any of aromatic polyester or a polyimide, when each compounding ratio is 5-30 wt%, a friction coefficient and a compressive-strain amount are shown. It was found that the target value was achieved together. Further, from Table 6, it was found that the target values of the coefficient of friction and the amount of compressive strain were achieved when the graphite addition amount was 20 wt% or less.

[Second Embodiment]
In FIG. 5, a sliding support device 110 according to the present embodiment is provided between a foundation formed on the ground and a building, supports the building on the foundation, and suppresses shaking of the building due to an earthquake or the like. Has a seismic function.

  The sliding support device 110 according to the present embodiment is provided at a portion where a lower structure 112 which is a foundation formed on the ground and an upper structure 114 which is a building provided on the foundation are opposed to each other. Yes. Further, the upper structure 114 and the lower structure 112 are configured to be relatively movable in the horizontal direction, and the movement range is limited by, for example, a damper (not shown).

  The sliding bearing device 110 includes a second sliding member 116 fixed to the lower structure 112, and the second sliding member 116 is made of, for example, a stainless steel plate. The second sliding member 116 is configured by a flat plate. The shape of the second sliding member 116 is not particularly limited, such as a rectangular plate shape or a disc shape.

  The upper surface of the second sliding member 116 constitutes a sliding surface 118. The sliding surface 118 may be constituted by a stainless steel surface constituting the second sliding member 116, or may be constituted by a laminated structure in which a resin agent or the like is laminated on the stainless steel surface. As shown in FIGS. 6A and 6B, the sliding surface 118 is coated with a lubricant for reducing the friction coefficient, and a lubricating film 120 is formed.

  In the present embodiment, the case where the lubricating film 120 is formed on the sliding surface 118 of the second sliding member 116 by coating with a lubricant will be described, but the present invention is not limited to this. For example, a bottomed hole is provided in the second sliding member 116 or a first sliding member 122 described later, and the bottomed hole is filled with a lubricant so that the lubricant that has exuded is slidable on the sliding surface 118 of the second sliding member 116. Alternatively, the lubricating film 120 may be formed.

  A first sliding member 122 is disposed on the second sliding member 116. The first sliding member 122 is not fixed to the second sliding member 116, the second sliding member 116 is provided on the lower structure 112 side, and the upper components including the first sliding member 122 are the upper structure. 114 side. In addition, regarding the first sliding member 122, the material, the friction coefficient when the surface pressure is 20 MPa, and the amount of compressive strain when the surface pressure is 80 MPa are the same as those of the first sliding member 14 in the first embodiment.

  Although the lubricating film 120 is interposed between the first sliding member 122 and the second sliding member 116, a region in which the lubricating film 120 is thin or lubricated due to a vertical load applied to the first sliding member 122. A region where the film 120 does not exist is formed. The first sliding member 122 is made of a low friction resin mainly composed of tetrafluoroethylene resin, and the surface direction along the sliding surface 118 of the second sliding member 116 by the material and the lubricating film 120. It is possible to slide to. For this reason, this 1st sliding member 122 can be paraphrased, for example as a low friction resin, a low friction member, and a friction reduction member.

  The 1st sliding member 122 is also comprised with the flat plate. The shape of the first sliding member 122 is not particularly limited, such as a rectangular plate shape or a disk shape, but a circular shape is used to facilitate movement in all directions along the surface of the second sliding member 116. It is desirable to have a plate shape. In addition, since the first sliding member 122 is slidable with respect to the second sliding member 116, the area thereof is configured to be smaller than the area of the second sliding member 116.

  A holding member 130 is provided on the upper portion of the first sliding member 122. The holding member 130 is made of metal, but may be made of other materials such as synthetic resin. The holding member 130 is formed in a shape corresponding to the first sliding member 122. An inner fitting portion 130 </ b> A is recessed on the lower surface of the holding member 130.

  The internal fitting portion 130 </ b> A is formed in a cylindrical recess shape having a low height for accommodating the upper portion of the first sliding member 122, and is configured to accommodate the first sliding member 122. The depth dimension of the recessed inner fitting portion 130 </ b> A is set to a value smaller than the thickness dimension of the first sliding member 122. The lower surface side of the first sliding member 122 protrudes from the inner fitting portion 130A and can be held by the holding member 130 in a state where the upper surface and the upper portion of the side surface of the first sliding member 122 are closely attached to the inner fitting portion 130A. It is configured.

  Thereby, the holding member 130 can be paraphrased as a holder or an attachment member, for example. In addition, in this specification, the state accommodated in the state which the site | part which opposes mutually_contact | adhered mutually is set as internal fitting.

  As shown in FIGS. 6A and 6B, an extending portion 130 </ b> B is formed on the outside of the inner fitting portion 130 </ b> A by the side wall surface of the holding member 130. The extending portion 130B extends in a state in which the first sliding member 122 is accommodated in the inner fitting portion 130A, so that the portion covering the outer peripheral portion of the first sliding member extends along the side surface 122A of the first sliding member 122. It is a part. In the present specification, the extended state is defined as the extended state.

  The extending portion 130B extends to the central portion in the thickness direction of the first sliding member 122, and the side surface 122A of the first sliding member 122 is surrounded over the entire circumference with the extending portion 130B in close contact. Yes. Thus, the first sliding member 122 can be prevented from being detached from the holding member 130 when the holding member 130 is horizontally moved in the lateral direction.

  In the present embodiment, the case where the entire circumference of the side surface 122A of the first sliding member 122 is surrounded by the extending portion 130B will be described as an example, but the holding means is not limited to this. For example, the extending portion 130 </ b> B, which is a plurality of protruding portions, is provided on the outer edge portion of the holding member 130 at a predetermined interval in the circumferential direction, and the extending portion 130 </ b> B extends to the side surface 122 </ b> A side of the first sliding member 122. Accordingly, the peripheral edge of the first sliding member 122 may be partially held at intervals.

  In the present embodiment, the case where the first sliding member 122 is surrounded and held by the extending portion 130B of the side surface 122A will be described as an example, but the present invention is not limited to this. For example, a holding structure in which the first sliding member 122 is bonded and held on the lower surface of the holding member 130 may be employed. In addition, as a holding structure in which a key plate is fitted in a recess provided on the opposing surface of the holding member 130 and the first sliding member 122, the holding member 130 and the first sliding member 122 are connected and held. Good.

  A concave portion 132 that is recessed upward is formed on the outer edge portion of the top surface 130 </ b> C of the inner fitting portion 130 </ b> A of the holding member 130. The recess 132 extends over the entire periphery of the outer edge of the top surface 130C, and as shown in FIGS. 6A and 6B, the recess 132 extends along the inside of the extension 130B. A groove having a rectangular cross section is formed.

  Accordingly, the recess 132 is provided at a portion corresponding to the upper surface of the outer edge portion 122 </ b> B of the first sliding member 122 in a state where the first sliding member 122 is accommodated in the holding member 130. Further, when the first sliding member 122 is deformed, the deformation is allowed so that the outer edge portion 122B of the first sliding member 122 can be deformed upward, which is a direction away from the sliding surface 118 of the second sliding member 116. The deformation allowing portion is constituted by the recess 132.

  In the holding member 130, a region inside the recess 132 in the top surface 130 </ b> C of the inner fitting portion 130 </ b> A is in surface contact with the first sliding member 122. Thereby, the vertical load applied to the 1st sliding member 122 from the holding member 130 is comprised so that it may be transmitted from this surface contact part. The transmission of the load to the first sliding member 122 is configured to be transmitted from the central portion in surface contact with the top surface 130C. A transmission structure that can transmit more load of the upper structure 114 than the outer edge portion 122B of the first sliding member 122 from the central portion located inside thereof is formed.

  Thereby, this deformation | transformation permission part can be paraphrased as a deformation | transformation permission structure and a pressure suppression structure, for example. Further, since the deformation allowing portion is constituted by the concave portion 132 that is retracted upward on the top surface 130C of the inner fitting portion 130A, it has a step with respect to the top surface 130C. For this reason, a deformation | transformation permission part can be paraphrased as a stepped part.

  In addition, although the case where the recessed part 132 which comprises this deformation | transformation permission part is formed in the cross-sectional rectangular shape is mentioned as an example, it demonstrates and it is not limited to this. For example, other cross-sectional shapes such as a semicircular cross-section and a triangular cross-section may be used.

  Further, when the first sliding member 122 is held by the holding member 130 by bonding or the like, the portion of the holding member 130 that faces the outer edge portion 122B of the first sliding member 122 is cut out from the side so that the extending portion 130B is formed. It is good also as a deformation | transformation allowance part omitted. Further, the outer dimension of the holding member 130 is made smaller than that of the first sliding member 122 so that the outer edge 122B of the first sliding member 122 can be deformed in a direction away from the sliding surface 118 of the second sliding member 116. A deformation allowing portion may be formed. In addition, these deformation | transformation permission parts also comprise the transmission structure for transmitting more load of the upper structure 114 from the center part located in the inner side rather than the outer edge part 122B of the 1st sliding member 122. FIG.

  Further, the recess 132 constituting the deformation allowing portion may be any space as long as the outer edge portion 122B of the first sliding member 122 can be deformed in a direction away from the sliding surface 118 of the second sliding member 116, and is not necessarily a space. There is no need. For example, as long as the deformation of the first sliding member 122 can be permitted, a soft body such as a sponge may be accommodated. And the recessed part 132 which comprises a deformation | transformation permission part does not need to be formed continuously over the perimeter of the holding member 130, and may be intermittently formed partially.

  As shown in FIG. 5, an elastic support 136 is provided on the upper portion of the holding member 130, and the elastic support 136 is formed in a columnar shape. The elastic support 136 includes a thick disc-shaped connecting steel plate 138 at the lower portion, and the connecting steel plate 138 is disposed on the holding member 130. The upper end portion of the key plate 140 is fitted in the lower surface hole 138A of the connecting steel plate 138, and the lower end portion of the key plate 140 is fitted in the upper surface hole 130D of the holding member 130. Accordingly, the connecting steel plate 138 of the elastic support 136 is prevented from being laterally displaced while being connected to the holding member 130, and the elastic support 136 and the holding member 130 are coupled.

  A plurality of disk-shaped rubber layers 142 and disk-shaped metal plates 144 are alternately stacked on the upper portion of the connecting steel plate 138, and the rubber layer 142 is provided on the top. The connecting steel plate 138, the metal plate 144, and the rubber layer 142 are surrounded by a rubber peripheral wall 146 made of rubber that forms the rubber layer 142, and the front end of the rubber peripheral wall 146 is joined to the peripheral surface of the holding member 130. ing. Thereby, the entire surface of the elastic support 136 is covered with the rubber and the holding member 130, and water tightness is ensured.

  The connecting steel plate 138 and the metal plate 144, the rubber layer 142 and the rubber peripheral wall 146 are firmly fixed by vulcanization adhesion, and a laminated structure in which the connecting steel plate 138, the metal plate 144 and the rubber layer 142 are integrated. It is configured. Thereby, it has predetermined rigidity with respect to a load in the vertical direction. Further, it is configured so as to exert a spring function and to secure a predetermined deformation amount with respect to a load in the horizontal direction. Therefore, the elastic support body 136 is configured to be able to absorb the energy with respect to a small sway.

  A mounting plate 150 is fixed to the upper part of the elastic support 136. The mounting plate 150 is fixed to the upper structure 114 by bolts at a portion not shown. Thereby, the elastic bearing body 136, the holding member 130 fixed to the lower part of the elastic bearing body 136, and the first sliding member 122 held by the holding member 130 are provided on the upper structure 114 side.

(Function)
Next, the operation of this embodiment will be described. In the embodiment according to the above configuration, the holding member 130 is formed with a deformation allowing portion that allows deformation in a direction away from the sliding surface 118 of the outer edge portion 122B of the first sliding member 122 by the recessed portion 132. For this reason, as shown in FIG. 6A, for example, when the vertical load from the upper structure 114 is transmitted to the central portion of the first sliding member 122 and the first sliding member 122 is deformed, the outer edge portion 122B slides. Deforms upward away from the surface 118.

  Therefore, when the lower structure 112 and the upper structure 114 move relative to each other in the horizontal direction, as shown in FIG. 6B, as in the comparative example in which the recess 132 is not formed on the top surface 130C of the inner fitting portion 130A of the holding member 130. In addition, the outer edge 122B of the first sliding member 122 is not deformed so as to enter the sliding surface 118 side, and the acute edge 122C is not formed. Therefore, as compared with the comparative example in which the edge 122C is formed, the edge 122C pushes the lubricant on the outer peripheral portion of the first sliding member 122 out of the moving range of the first sliding member 122. The lubricant can be maintained at the return position of the sliding member 122.

  Thereby, the lubricating film 120 maintained when the 1st sliding member 122 returned to the predetermined position can be used repeatedly. For this reason, as shown to FIG. 6A, even if the 1st sliding member 122 slides, the reduction | decrease of the lubricant which can be utilized can be suppressed.

  Therefore, the lubricant film 120 having a predetermined thickness can be maintained without taking measures such as selecting the specification and type of the lubricant and increasing the amount of the lubricant retained, thereby suppressing an increase in the friction coefficient. As a result, the friction coefficient of the first sliding member 122 can be stabilized, and the repetition characteristics during sliding can be improved.

  Further, the outer edge portion 122B of the first sliding member 122 is deformed in a direction away from the sliding surface 118 as shown in FIG. 6A. Therefore, the first sliding member 122 is deformed upward in the outer edge portion 122B of the first sliding member 122 so that the lower surface on the sliding surface 118 side is separated from the sliding surface 118, and the outer edge portion 122B of the first sliding member 122 has an outer edge. It is also possible to be deformed upward as it goes to become the deformed portion 122D.

  In such a case, since the corner portion can be rounded, the lubricant between the first sliding member 122 and the sliding surface 118 is formed by the gap formed between the deforming portion 122D and the sliding surface 118. Can be taken up. Therefore, an increase in the friction coefficient between the first sliding member 122 and the sliding surface 118 can be suppressed.

  Further, the holding member 130 is provided with an extending portion 130 </ b> B that extends along the side surface 122 </ b> A of the first sliding member 122. For this reason, when the first sliding member 122 moves horizontally with respect to the sliding surface 118 by the relative movement of the lower structure 112 and the upper structure 114 in the horizontal direction, the extending portion 130B is moved to the first sliding member. 122 can be brought into contact with the side surface. Thereby, since the 1st sliding member 122 can be supported from this side by this extension part 130B, the retention strength of the 1st sliding member 122 by the holding member 130 at the time of sliding can be heightened.

  7A and 7B are experimental results when a pressure sensitive paper is sandwiched between the second sliding member 116 and the first sliding member 122 and the pressure is applied at 20 MPa in the sliding support device 110 according to the present embodiment and the comparative example. FIG. FIG. 7A shows the pressure-sensitive paper used in the present embodiment in which the holding member 130 is provided with the concave portion 132, and FIG. 7B shows the pressure-sensitive paper used in the comparative example in which the holding member 130 is not provided with the concave portion 132. It is shown.

  According to this experimental result, in the comparative example of FIG. 7B, a dark portion appears on the outer peripheral portion 200 of the pressure-sensitive paper, the pressure at the outer peripheral edge portion of the first sliding member 122 is high, and the outer edge of the first sliding member 122 It was confirmed that the portion 122B was deformed toward the sliding surface 118, and an acute edge 122C was formed.

  On the other hand, in the present embodiment of FIG. 7A, a light-colored portion appears on the outer peripheral portion 210 of the pressure-sensitive paper, the pressure at the outer peripheral edge portion of the first sliding member 122 is low, and the outer edge of the first sliding member 122 It can be seen that the portion 122B is deformed in a direction away from the sliding surface 118.

  8A and 8B are diagrams showing repeated friction characteristics between the sliding bearing device 110 according to this embodiment and the comparative example. As this embodiment, the holding member 130 provided with a recess 132 is used. As a comparative example, a holding member 130 having no recess 132 is used.

  FIG. 8A is a diagram showing a comparison based on the sliding friction coefficient of the first cycle when the first sliding member 122 is moved in the horizontal direction with respect to the second sliding member 116. According to this experimental result, in the comparative example, when the number of repetitions exceeds a predetermined value, the friction coefficient increases. However, in this embodiment, no increase in the coefficient of friction was recognized even when the number of repetitions increased.

  FIG. 8B is a diagram showing a comparison based on the friction coefficient of the third cycle when the first sliding member 122 is moved in the horizontal direction with respect to the second sliding member 116. According to this experimental result, in the comparative example, when the number of repetitions exceeds a predetermined value, the friction coefficient increases. However, in this embodiment, no increase in the coefficient of friction was recognized even when the number of repetitions increased.

  FIG. 9 is a diagram showing a hysteresis curve (one cycle) between the sliding support device 110 according to the present embodiment and the comparative example. In the present embodiment, the holding member 130 is provided with a recess 132, and the comparative example is a holding member. The thing in which the recessed part 132 was not provided in 130 was used.

  FIG. 9A shows a comparison of the friction coefficient ratio when the sliding friction coefficient is 1, and the ratio of the friction coefficient when the first sliding member 122 is moved in the horizontal direction with respect to the second sliding member 116 is shown. It is shown. In FIG. 9A, the horizontal axis indicates the horizontal displacement, and the vertical axis indicates the ratio of the friction coefficient when the friction coefficient of the sliding start is 1.

  According to this experimental result, it can be seen that in the comparative example, the change in the friction coefficient ratio is large with respect to the horizontal movement position, and the friction coefficient is not stable. On the other hand, in this embodiment, it can be seen that the friction coefficient ratio is small with respect to the horizontal movement position, and the friction coefficient is stable.

  FIG. 9B is a diagram showing comparison of hysteresis curves (one cycle), and shows the amount of change in the friction coefficient when the first sliding member 122 is moved in the horizontal direction with respect to the second sliding member 116. In FIG. 9B, the horizontal axis represents the horizontal displacement, and the vertical axis represents the friction coefficient.

  According to this experimental result, it can be seen that in the comparative example, the friction coefficient changes greatly with respect to the horizontal movement position, and the friction coefficient is not stable. On the other hand, in this embodiment, it can be seen that there is little change in the friction coefficient with respect to the horizontal movement position, and the friction coefficient is stable.

  From these, the sliding bearing device 110 according to the present embodiment has improved repetition characteristics and stabilized hysteresis characteristics as compared with the comparative example, and thereby the effect of reducing friction was recognized.

  In the present embodiment, the case where the holding member 130 is provided on the upper structure 114 side and the sliding surface 118 is set on the lower structure 112 side has been described. However, the present invention is not limited to this. The sliding surface 118 may be set on the upper structure 114 side, and the holding member 130 may be provided on the lower structure 112 side.

  As mentioned above, although embodiment of this invention was described, embodiment of this invention is not limited above, In addition to the above, in the range which does not deviate from the main point, it can implement variously. Of course. Moreover, you may combine the structure as described in the said embodiment suitably.

The disclosures of Japanese Patent Application No. 2016-8928 filed on January 20, 2016 and Japanese Patent Application No. 2006-55906 filed on March 18, 2016 are hereby incorporated by reference in their entirety. Is taken in.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually described to be incorporated by reference, Incorporated herein by reference.

Claims (17)

A sliding bearing body interposed between the lower structure and the upper structure disposed above the lower structure, and fixed to one of the upper structure and the lower structure;
A first sliding member provided on the sliding bearing body and having a sliding surface for the other of the upper structure and the lower structure;
The first sliding member is interposed between the sliding bearing body and the first sliding member, and the first sliding member is deformed in a direction away from the other of the upper structure and the lower structure. A holding member provided with a deformation allowing portion for allowing
Sliding bearing device having   The sliding bearing device according to claim 1, wherein the deformation allowing portion is a through hole.   The sliding bearing device according to claim 2, wherein the through hole is a circular hole.   The sliding support device according to claim 2 or 3, wherein the through hole is formed at a position corresponding to a center portion of the first sliding member.   The sliding bearing device according to any one of claims 2 to 4, wherein a plurality of the through holes are formed. The other of the upper structure and the lower structure is provided with a second sliding member having a sliding surface with respect to the first sliding member,
The sliding bearing device according to any one of claims 1 to 5, wherein a lubricant is disposed between the first sliding member and the second sliding member. Holding members provided on either one of the upper structure and the lower structure that face each other and are relatively movable in the horizontal direction;
A first sliding member that is held by the holding member and slides along a sliding surface provided on one of the upper structure and the lower structure;
A deformation allowing portion that is provided in any one of the upper structure and the lower structure and allows deformation of an outer edge portion of the first sliding member in a direction away from the sliding surface;
Sliding bearing device having   The sliding bearing device according to claim 7, wherein the deformation allowing portion is configured by forming a recess in a portion of the holding member corresponding to an outer edge portion of the first sliding member.   The sliding support device according to claim 7 or 8, wherein the holding member has an extending portion that extends to a side surface side of the first sliding member. A second sliding member provided on the lower structure side and provided with a sliding surface;
A first sliding member that slides on the second sliding member;
A holding member that holds the first sliding member from the upper structure side, and that transmits the load of the upper structure more to the center than to the outer edge of the first sliding member;
Sliding bearing device having   The sliding bearing device according to any one of claims 1 to 10, wherein the first sliding member is a tetrafluoroethylene resin composition containing aromatic polyester or polyimide.   The sliding support device according to any one of claims 1 to 10, wherein the first sliding member is a tetrafluoroethylene resin composition containing 5 to 30 wt% of aromatic polyester.   The sliding support device according to any one of claims 1 to 10, wherein the first sliding member is a tetrafluoroethylene resin composition containing 5 to 30 wt% of polyimide.   The sliding bearing according to any one of claims 11 to 13, wherein the first sliding member further contains at least one of carbon fiber, graphite, glass fiber, molybdenum disulfide, potassium titanate, and bronze. apparatus.   The first sliding member further contains one or more of carbon fiber, graphite, glass fiber, molybdenum disulfide, potassium titanate, and bronze in excess of 0 and 20 wt% or less. The sliding bearing device according to item 1.   The sliding bearing device according to any one of claims 11 to 15, wherein a friction coefficient when the first sliding member has a surface pressure of 20 MPa is 0.01 or less.   The sliding bearing device according to any one of claims 11 to 15, wherein the amount of compressive strain when the first sliding member has a surface pressure of 80 MPa is 40% or less.