Method of manufacturing laminated rubber bearing

Abstract

By reducing the risk of internal peeling or air mixing, it is possible to suppress a decrease in function as a product.SOLUTION: The laminated rubber support includes a lower steel plate, an upper steel plate, a plurality of plate-shaped rubber members stacked in the vertical direction between the lower steel plate and the upper steel plate, an inner layer steel plate disposed between the rubber members adjacent to each other in the vertical direction, and a lead plug which has a columnar shape, penetrates the lower steel plate, the rubber members, the inner layer steel plate, and the upper steel plate in the vertical direction, has a side surface entirely exposed to lead, and is disposed such that the side surface is in close contact with the lower steel plate, the rubber members, the inner layer steel plate, and the upper steel plate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminated rubber bearing and a method for manufacturing the laminated rubber bearing. [Background technology]

[0002] As a laminated rubber bearing, a lead plug laminated rubber bearing in which a columnar lead plug is embedded is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-169698 Summary of the Invention [Problem to be solved by the invention]

[0004] The laminated rubber bearing described in Patent Document 1 is molded by wrapping the covering rubber around the lead plug, which creates gaps between the lead and the covering rubber. Furthermore, during the lamination process, a space is required between the wrapped covering rubber and the main rubber, which also creates gaps in that area. This increases the risk of peeling or air intrusion within the product, potentially reducing its functionality.

[0005] The present invention has been made in consideration of the above, and aims to provide a laminated rubber bearing and a method for manufacturing a laminated rubber bearing that can suppress functional degradation as a product by reducing the risk of internal delamination and air entrapment. [Means for solving the problem]

[0006] The laminated rubber bearing of the present invention comprises a lower steel plate and an upper steel plate, plate-shaped rubber members stacked in multiple layers in the vertical direction between the lower steel plate and the upper steel plate, an inner layer steel plate arranged between adjacent rubber members in the vertical direction, and a columnar lead plug that penetrates the lower steel plate, the rubber member, the inner layer steel plate and the upper steel plate in the vertical direction, with lead exposed on the entire side surface and arranged so that the side surface is in close contact with the lower steel plate, the rubber member, the inner layer steel plate and the upper steel plate, respectively.

[0007] The manufacturing method of the laminated rubber bearing according to the present invention includes a lower steel plate arranging step of arranging a lower steel plate having a through hole penetrating in the vertical direction; a lead plug arranging step of inserting a columnar lead plug having lead exposed on the entire side surface into the through hole of the lower steel plate so that the side surface is in close contact with the inner peripheral surface of the through hole; a laminating step of stacking a plurality of plate-shaped pre-vulcanized rubber members so that they are in close contact around the side surface of the lead plug, and arranging inner layer steel plates between vertically adjacent pre-vulcanized rubber members so that they are in close contact around the side surface of the lead plug; an upper steel plate arranging step of arranging an upper steel plate having a through hole penetrating in the vertical direction on top of the pre-vulcanized rubber member of the topmost layer so that the side surface of the lead plug is in close contact with the inner peripheral surface of the through hole of the upper steel plate; and a vulcanization step of, after the upper steel plate arranging step, applying heat and pressure to a laminate obtained by stacking the lower steel plate, the pre-vulcanized rubber member, the inner layer steel plate, and the upper steel plate to vulcanize the pre-vulcanized rubber member. [Effects of the Invention]

[0008] According to the present invention, the risk of internal peeling and air inclusion can be reduced, thereby suppressing deterioration of the product's functionality. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing an example of a laminated rubber bearing according to this embodiment. [Figure 2] FIG. 2 is a plan view showing an example of the laminated rubber bearing according to this embodiment. [Figure 3] FIG. 3 is a diagram showing the configuration along the cross section AA in FIG. [Figure 4] FIG. 4 is a flowchart showing an example of a manufacturing method for a laminated rubber bearing. [Figure 5] FIG. 5 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 6] FIG. 6 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 7] FIG. 7 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 8] FIG. 8 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 9] FIG. 9 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 10] FIG. 10 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 11] FIG. 11 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 12] FIG. 12 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 13] FIG. 13 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 14] FIG. 14 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 15] FIG. 15 is a diagram showing an example of a manufacturing process for a laminated rubber bearing. [Figure 16] FIG. 16 is a graph schematically showing the relationship between the heating temperature and the pressure in the vulcanization process. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of a laminated rubber bearing and a manufacturing method for a laminated rubber bearing according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical.

[0011] FIG. 1 is a perspective view showing an example of a laminated rubber bearing according to this embodiment. FIG. 2 is a plan view showing an example of a laminated rubber bearing according to this embodiment. FIG. 3 is a view showing the configuration along the AA cross section in FIG. 2. The laminated rubber bearing 100 shown in FIGS. 1 to 3 is installed in the foundation of a structure or the like to serve as a bearing. As shown in FIGS. 1 to 3, the laminated rubber bearing 100 comprises a lower steel plate 10, an upper steel plate 20, a rubber member 30, an inner layer steel plate 40, a lead plug 50, and a covering rubber 60. In the laminated rubber bearing 100 according to this embodiment, the lead plug 50 is used as a damping body.

[0012] The lower steel plate 10 and the upper steel plate 20 are formed using, for example, rectangular steel plates. The lower steel plate 10 and the upper steel plate 20 have through holes 11 and 21, respectively. The through holes 11 and 21 are provided for inserting lead plugs 50, which will be described later. In addition, an insertion hole 12, which is used when manufacturing the laminated rubber bearing 100, is formed in the lower surface 10a of the lower steel plate 10. Similarly, an insertion hole 22, which is used when manufacturing the laminated rubber bearing 100, is formed in the upper surface 20b of the upper steel plate 20. In addition, the upper steel plate 10 has a circular shear key 23 in its center when viewed from above.

[0013] A plurality of rubber members 30 are stacked in the vertical direction between the lower steel plate 10 and the upper steel plate 20. The rubber members 30 have through holes 31.

[0014] The inner layer steel plates 40 are disposed between the vertically adjacent rubber members 30. Each of the inner layer steel plates 40 has a through hole 41.

[0015] The lead plug 50 has a columnar shape, such as a cylindrical shape. The lead plug 50 penetrates the lower steel plate 10, the rubber member 30, the inner layer steel plate 40, and the upper steel plate 20 in the vertical direction. The lead plug 50 has lead exposed on the entire side surface 51. The lead plug 50 is arranged so that the side surface 51 is in close contact with the lower steel plate 10, the rubber member 30, the inner layer steel plate 40, and the upper steel plate 20, respectively. In other words, the lead plug 50 is arranged without any gaps between the lower steel plate 10, the rubber member 30, the inner layer steel plate 40, and the upper steel plate 20. As shown in the enlarged view of the dashed line portion in FIG. 3 , the lead plug 50 has a shape in which a portion (51a) of the side surface 51 that is in close contact with the rubber member 30, i.e., the rubber-intimate contact portion 51a that is in close contact with the inner wall of the through-hole 31 of the rubber member 30, expands radially. The lower end surface 50a of the lead plug 50 is flush with the lower surface 10a of the lower steel plate 10. The upper end surface 50 b of the lead plug 50 is flush with the upper surface 20 b of the upper steel plate 20 .

[0016] The covering rubber 60 is arranged so as to cover the side surfaces of the lower steel plate 10, the rubber member 30, the inner layer steel plate 40, and the upper steel plate 20. The covering rubber 60 is used to suppress ozone degradation during manufacturing (vulcanization), for example.

[0017] Next, a method for manufacturing the laminated rubber bearing 100 configured as described above will be described. Figure 4 is a flowchart showing an example of a method for manufacturing a laminated rubber bearing. Figures 5 to 15 are diagrams showing an example of a manufacturing process for a laminated rubber bearing.

[0018] As shown in FIG. 4, the manufacturing method of the laminated rubber bearing 100 includes a lower steel plate arrangement process S10, a lead plug arrangement process S20, a lamination process S30, a covering rubber arrangement process S40, an upper steel plate arrangement process S50, an upper support iron plate arrangement process S60, and a vulcanization process S70.

[0019] In the lower steel plate placement process S10, a lower steel plate 10 having a through hole 11 is placed on a lower support iron plate 70, and a locking member 75 is used to lock the lower steel plate 10 and the lower support iron plate 70 together. An insertion hole 12 for inserting the locking member 75 is formed in advance on the underside 10a of the lower steel plate 10. An insertion hole 71 for inserting the locking member 75 is also formed in advance in the lower support iron plate 70. When placing the lower steel plate 10 on the lower support iron plate 70, as shown in FIG. 5, a columnar locking member 75 is inserted into the insertion hole 12 so that a portion of the locking member 75 protrudes from the insertion hole 12. From this state, as shown in FIG. 6, the protruding portion of the locking member 75 is aligned with the position of the insertion hole 71 in the lower support iron plate 70, allowing the locking member 75 to be inserted into the insertion hole 71. By inserting the locking member 75 into the insertion hole 12 and the insertion hole 71, the lower steel plate 10 and the lower support iron plate 70 can be locked together by the locking member 75. This makes it possible to restrict lateral positional deviation between the lower steel plate 10 and the lower support iron plate 70.

[0020] In the lead plug placement step S20, a columnar lead plug 50 with lead exposed on the entire surface of its side surface 51 is inserted into the through hole 11 of the lower steel plate 10. At this time, as shown in FIG. 7, the lead plug 50 is inserted so that the side surface 51 is in close contact with the inner circumferential surface of the through hole 11. The lead plug 50 is inserted so that the lower end surface 50a of the lead plug 50 corresponds to the lower surface 10a of the lower steel plate 10 (for example, is flush with the lower steel plate 10). By inserting the lead plug 50 as described above, the lead plug 50 is placed in a state where it protrudes upward from the lower steel plate 10.

[0021] In the lamination step S30, first, as shown in FIG. 8, a plate-shaped pre-vulcanized rubber member 35 is laminated on the upper surface 10b of the lower steel plate 10. The pre-vulcanized rubber member 35 is arranged so as to be penetrated by the lead plug 50 while being in close contact with the side surface of the lead plug 50 around the circumference. A through hole 36 that penetrates the lead plug 50 is formed in the pre-vulcanized rubber member 35 in advance. Then, in the lamination step S30, the pre-vulcanized rubber member 35 is laminated so as to penetrate the lead plug 50 into the through hole 36. After arranging one layer of the pre-vulcanized rubber member 35 in this manner, an inner layer steel plate 40 is arranged on the pre-vulcanized rubber member 35 as shown in FIG. 9. Similarly, the inner layer steel plate 40 is arranged so as to be penetrated by the lead plug 50 while being in close contact with the side surface of the lead plug 50 around the circumference. A through hole 41 that penetrates the lead plug 50 is formed in the inner layer steel plate 40 in advance. Then, in the lamination step S30, the inner layer steel plates 40 are laminated so that the lead plug 50 passes through the through hole 41. After the inner layer steel plates 40 are laminated, the pre-vulcanized rubber members 35 and the inner layer steel plates 40 are laminated alternately. In this way, in the lamination step S30, a plurality of pre-vulcanized rubber members 35 are laminated so as to be in close contact around the side surface 51 of the lead plug 50, and the inner layer steel plates 40 are arranged between vertically adjacent pre-vulcanized rubber members 35 so as to be in close contact around the side surface 51 of the lead plug 50. In the lamination step S30, the pre-vulcanized rubber members 35 are laminated so as to be in close contact around the side surface 51 of the lead plug 50. Note that in the lamination step S30, the pre-vulcanized rubber members 35 are laminated to be the uppermost layer, as shown in FIG. 10 .

[0022] 11, in the upper steel plate placement process S40, an upper steel plate 20 having a through hole 21 is placed on top of the uppermost pre-vulcanized rubber member 35 so that the side surface 51 of the lead plug 50 is in close contact with the inner circumferential surface of the through hole 21. This forms a laminate 90 in which the lower steel plate 10, pre-vulcanized rubber member 35, inner layer steel plate 40, and upper steel plate 20 are stacked. After the upper steel plate 20 is placed, a columnar locking member 85 is inserted into an insertion hole 22 formed in advance in the upper surface 20b of the upper steel plate 20 so that a portion of it protrudes from the insertion hole 22.

[0023] In the covering rubber placement process S50, as shown in Figure 12, covering rubber 60 is placed so as to cover the sides of the formed laminate 90, i.e., the sides of the lower steel plate 10, rubber member 30, inner layer steel plate 40 and upper steel plate 20, and to seal the gap with the lower support iron plate 70.

[0024] In the upper support iron plate placement process S60, as shown in FIG. 13 , the upper support iron plate 80 is placed on the upper surface 20b of the upper steel plate 20 so as to seal the stack 90 between the lower support iron plate 70 and the covering rubber 60, and a locking member 85 is used to lock the upper steel plate 20 and the upper support iron plate 80. This seals the stack 90 between the covering rubber 60, the lower support iron plate 70, and the upper support iron plate 80. Note that an insertion hole 81 for inserting the locking member 85 is formed in advance in the upper support iron plate 80. When placing the upper support iron plate 80, the insertion hole 81 is aligned to correspond to the position of the protruding portion of the locking member 85, so that the locking member 85 can be inserted into the insertion hole 81. By inserting the locking member 85 into the insertion hole 22 and the insertion hole 81, the upper steel plate 20 and the upper support iron plate 80 can be locked by the locking member 85. This makes it possible to restrict lateral positional deviation between the upper steel plate 20 and the upper support iron plate 80.

[0025] In the vulcanization step S70, heat and pressure are applied to a laminate 90 formed by stacking the lower steel plate 10, the pre-vulcanization rubber member 35, the inner layer steel plate 40, and the upper steel plate 20, to vulcanize the pre-vulcanization rubber member 35. When performing the vulcanization step S70, a lower supporting iron plate 70 is placed on the lower surface 10a of the lower steel plate 10, and an upper supporting iron plate 80 is placed on the upper surface 20b of the upper steel plate 20, with the lower steel plate 10 and the lower supporting iron plate 70 and the upper steel plate 20 and the upper supporting iron plate 80 locked together by locking members 75 and 85, respectively. Furthermore, the sides of the laminate 90 are covered with covering rubber 60 so as to seal the laminate 90 between the lower supporting iron plate 70 and the upper supporting iron plate 80. 14, while the side surfaces of the lower supporting iron plate 70 and the upper supporting iron plate 80 are supported by a mold 95, the laminate 90 is heated and pressurized to be vulcanized.

[0026] During heating in the vulcanization step S70, because lead is exposed on the entire side surface 51 of the lead plug 50, heat is easily transferred to the pre-vulcanized rubber member 35 and the inner layer steel plate 40 via the lead plug 50. This allows the pre-vulcanized rubber member 35 and the inner layer steel plate 40 to be heated efficiently.

[0027] Furthermore, heating in the vulcanization step S70 causes thermal expansion of the lead plug 50. The side surface 51 of the lead plug 50 has a portion in close contact with the lower steel plate 10, a portion in close contact with the pre-vulcanization rubber member 35, a portion in close contact with the inner layer steel plate 40, and a portion in close contact with the upper steel plate 20. Radial thermal expansion of the side surface 51 is restricted in the portion in close contact with the lower steel plate 10, the portion in close contact with the inner layer steel plate 40, and the portion in close contact with the upper steel plate 20. On the other hand, radial thermal expansion is permitted in the portion in close contact with the pre-vulcanization rubber member 35. Therefore, the portion of the side surface 51 in close contact with the pre-vulcanization rubber member 35 of the lead plug 50 expands in the radial direction (see FIG. 3).

[0028] By applying heat and pressure in the vulcanization step S70, a compressive force is applied to the laminate 90 in the vertical direction from the lower support iron plate 70 and the upper support iron plate 80. This compressive force causes the lower surface 10a of the lower steel plate 10 to be flush with the lower end surface 50a of the lead plug 50. Similarly, the upper surface 20b of the upper steel plate 20 to be flush with the upper end surface 50b of the lead plug 50.

[0029] In the vulcanization step S70, the lower steel plate 10 and the lower support iron plate 70 are locked with the locking member 75, the upper steel plate 20 and the upper support iron plate 80 are locked with the locking member 85, and the side surfaces of the lower support iron plate 70 and the upper support iron plate 80 are supported by the mold 95, so that lateral displacement of each layer is suppressed during vulcanization. Therefore, misalignment of the lead plug 50 is suppressed.

[0030] FIG. 16 is a graph showing a relationship between the heating temperature and pressure in the vulcanization step S70. The horizontal axis of FIG. 16 indicates the passage of time, the vertical axis (left axis) indicates temperature, and the vertical axis (right axis) indicates pressure. The solid line G1 indicates the change in temperature, and the dashed-dotted line G2 indicates the change in pressure. As shown in FIG. 16, in the vulcanization step S70, the laminate 90 is heated so that the heating temperature increases stepwise. In addition, in the vulcanization step S70, the laminate 90 is pressurized so that the applied pressure decreases stepwise. As shown in FIG. 16, after the start of vulcanization, the heating temperature is first increased in multiple steps while the applied pressure is maintained constant. After the heating temperature is increased in multiple steps, the applied pressure is decreased. Thereafter, the increase in heating temperature and the decrease in applied pressure are alternately performed. In addition, the applied pressure is set to 0 before the time Te at which vulcanization is completed. Note that the timing of changing the heating temperature and applied pressure is not limited to the above.

[0031] After the vulcanization step S70, the integrated assembly of the coated rubber 60, lower supporting iron plate 70, upper supporting iron plate 80, and laminate 90 is removed from the mold, and the lower supporting iron plate 70 and upper supporting iron plate 80 are removed. The laminate 90 provided with the coated rubber 60 is then allowed to cool naturally, thereby forming the laminated rubber bearing 100 described above, as shown in Figure 15.

[0032] As described above, the laminated rubber bearing 100 of this embodiment comprises a lower steel plate 10, an upper steel plate 20, plate-shaped rubber members 30 stacked in multiple layers in the vertical direction between the lower steel plate 10 and the upper steel plate 20, an inner layer steel plate 40 arranged between adjacent rubber members 30 in the vertical direction, and a columnar lead plug 50 that is arranged so that it penetrates the lower steel plate 10, rubber member 30, inner layer steel plate 40 and upper steel plate 20 in the vertical direction, with lead exposed on the entire side surface and is in close contact with the lower steel plate 10, rubber member 30, inner layer steel plate 40 and upper steel plate 20, respectively.

[0033] According to this configuration, lead is exposed on the entire side surface 51 of the lead plug 50, and the lead plug 50 is arranged so that the side surface 51 is in close contact with the lower steel plate 10, the rubber member 30, the inner layer steel plate 40, and the upper steel plate 20, thereby reducing the risk of internal peeling and air intrusion during manufacturing. As a result, it is possible to provide a laminated rubber bearing that has sufficient functionality as a product.

[0034] In the laminated rubber bearing 100 of this embodiment, the portion of the side surface 51 of the lead plug 50 that comes into close contact with the rubber member 30 has a shape that is radially expanded compared to the portions that come into close contact with the lower steel plate 10, the inner layer steel plate 40, and the upper steel plate 20.

[0035] This configuration ensures stronger adhesion between the side surface 51 of the lead plug 50 and the rubber member 30. Therefore, the risk of internal peeling and air intrusion during manufacturing is further reduced.

[0036] In the laminated rubber bearing 100 according to this embodiment, the lead plug 50 is arranged so as to be flush with the lower surface 10 a of the lower steel plate 10 and the upper surface 20 b of the upper steel plate 20 .

[0037] This configuration makes it possible to provide a laminated rubber bearing that functions satisfactorily as a product.

[0038] The manufacturing method of the laminated rubber bearing according to this embodiment includes a lower steel plate arrangement step S10 of arranging a lower steel plate 10 having a through hole arranged so as to be flush with the lower surface 10a of the lower steel plate 10 and the upper surface 20b of the upper steel plate 20; a lead plug arrangement step S20 of inserting a columnar lead plug 50 having lead exposed on the entire side surface into the through hole of the lower steel plate 10 so that the side surface is in close contact with the inner peripheral surface of the through hole; and a step S21 of stacking a plurality of plate-shaped pre-vulcanized rubber members 35 so that they are in close contact around the side surface of the lead plug 50, and inserting the pre-vulcanized rubber members 35 adjacent in the vertical direction. The process includes a lamination process S30 in which an inner layer steel plate 40 is placed between the lower steel plate 10 and the upper steel plate 20 so that the inner layer steel plate 40 is in close contact with the entire side of the lead plug 50, between the lower steel plate 10 and the upper steel plate 20, and an upper steel plate arranging process S40 in which an upper steel plate 20 having a through hole passing through in the vertical direction is placed on top of the uppermost pre-vulcanized rubber member 35 so that the side of the lead plug 50 is in close contact with the inner surface of the through hole in the upper steel plate 20, and a vulcanization process S70 in which, after the upper steel plate arranging process, the laminate formed by stacking the lower steel plate 10, pre-vulcanized rubber member 35, inner layer steel plate 40 and upper steel plate 20 is heated and pressurized to vulcanize the pre-vulcanized rubber member 35.

[0039] According to this configuration, the vulcanization step S70 is performed with the lead-exposed side surface 51 of the lead plug 50 in close contact with the lower steel plate 10, the pre-vulcanized rubber member 35, the inner layer steel plate 40, and the upper steel plate 20, respectively. This prevents gaps from forming between the lead plug 50 and the lower steel plate 10, the pre-vulcanized rubber member 35, the inner layer steel plate 40, and the upper steel plate 20. This reduces the risk of internal delamination and air intrusion, and suppresses deterioration of product performance. Furthermore, the heat generated in the vulcanization step S70 reduces the viscosity of the pre-vulcanized rubber member 35, thereby reducing the resistance of the pre-vulcanized rubber member 35. Furthermore, because the lead plug 50 is inserted when the stack is still high at room temperature before vulcanization, the lead plug 50 is less likely to be crushed during vulcanization and penetrates evenly. This stabilizes the product performance of the manufactured laminated rubber bearing 100. Furthermore, in the vulcanization step S70, the pre-vulcanization rubber member 35 flows and vulcanizes in accordance with the shape of the lead plug 50, so that the risk of damage to the vulcanized rubber member 30 can be avoided.

[0040] In the manufacturing method of the laminated rubber bearing according to this embodiment, in the vulcanization step S70, the laminate is heated so that the heating temperature is increased in stages.

[0041] According to this configuration, by appropriately heating in the vulcanization step S70, it is possible to manufacture a laminated rubber bearing that has sufficient functionality as a product.

[0042] In the manufacturing method of the laminated rubber bearing according to this embodiment, in the vulcanization step S70, the laminate is pressurized so that the pressurizing pressure decreases stepwise.

[0043] According to this configuration, by applying appropriate pressure in the vulcanization step S70, it is possible to manufacture a laminated rubber bearing that has sufficient functionality as a product.

[0044] In the manufacturing method of the laminated rubber bearing according to this embodiment, in the lower steel plate arrangement step S10, a lower support iron plate 70 is arranged on the underside 10a of the lower steel plate 10, and the lower steel plate 10 and the lower support iron plate 70 are locked with a locking member 75. After the stacking step S30 and before the upper steel plate arrangement step S50, a covering rubber arrangement step S40 is carried out in which the side of the laminate 90 is covered with covering rubber 60 so as to surround the laminate 90 between the lower support iron plate 70 and the upper steel plate After the steel plate placement process S50 and before the vulcanization process S70, an upper support iron plate 80 is placed on the upper surface of the upper steel plate 20 so as to seal the laminate 90 between the lower support iron plate 70 and the covering rubber 60, and an upper support iron plate placement process S60 is performed in which the upper steel plate 20 and the upper support iron plate 80 are locked with a locking member 85.In the vulcanization process S70, vulcanization is performed while the side of the lower support iron plate 70 and the side of the upper support iron plate 80 are supported by a mold 95.

[0045] According to this configuration, in the vulcanization step S70, the mold 95 supports the side surfaces of the lower support iron plate 70 and the upper support iron plate 80, thereby suppressing lateral displacement between the lower steel plate 10 and the upper steel plate 20. This makes it possible to suppress misalignment of the lead plug 50.

[0046] The technical scope of the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0047] 10 Lower steel plate 10a Bottom side 10b,20b top surface 11, 21, 36, 41 through holes 12, 22, 71, 81 Insertion holes 20 Top steel plate 30 Rubber parts 35 Pre-vulcanized rubber material 40 Inner layer steel plate 50 lead plugs 50a Lower end surface 50b Upper end surface 51 Side 60 Coated Rubber 70 Lower support iron plate 75,85 Locking member 80 Upper support iron plate 90 laminate 95 Molds 100 Laminated rubber bearing S10 Lower steel plate placement process S20 Lead plug placement process S30 lamination process S40 Upper steel plate placement process S50 Covering rubber placement process S60 Upper support steel plate placement process S70 vulcanization process

Claims

1. a lower steel plate and an upper steel plate; a plurality of plate-shaped rubber members stacked in the vertical direction between the lower steel plate and the upper steel plate; an inner layer steel plate disposed between the rubber members adjacent to each other in the vertical direction; a lead plug that is columnar, penetrates the lower steel plate, the rubber member, the inner layer steel plate, and the upper steel plate in the vertical direction, has lead exposed on the entire side surface, and is arranged so that the side surface is in close contact with the lower steel plate, the rubber member, the inner layer steel plate, and the upper steel plate, respectively; A laminated rubber bearing comprising:

2. The lead plug has a shape in which a portion of the side surface that comes into close contact with the rubber member is expanded in the radial direction compared to portions that come into close contact with the lower steel plate, the inner layer steel plate, and the upper steel plate. The laminated rubber bearing according to claim 1.

3. The lead plug is arranged so as to be flush with the lower surface of the lower steel plate and the upper surface of the upper steel plate. The laminated rubber bearing according to claim 1.

4. a lower steel plate arranging step of arranging a lower steel plate having a through hole; a lead plug placement step of inserting a columnar lead plug having lead exposed on the entire side surface into the through hole of the lower steel plate so that the side surface is in close contact with the inner circumferential surface of the through hole; a lamination process in which a plurality of plate-shaped pre-vulcanized rubber members are laminated so as to be in close contact with one periphery of the side surface of the lead plug, and an inner layer steel plate is disposed between adjacent pre-vulcanized rubber members in the vertical direction so as to be in close contact with one periphery of the side surface of the lead plug; an upper steel plate arrangement step of arranging an upper steel plate having a through hole penetrating in the up-down direction on the uppermost pre-vulcanized rubber member so that the side surface of the lead plug is in close contact with the inner peripheral surface of the through hole of the upper steel plate; a vulcanization step of applying heat and pressure to a laminate obtained by stacking the lower steel plate, the pre-vulcanization rubber member, the inner layer steel plate, and the upper steel plate after the upper steel plate arranging step to vulcanize the pre-vulcanization rubber member; A method for manufacturing a laminated rubber bearing, comprising:

5. In the vulcanization step, the laminate is heated so that the heating temperature is increased stepwise. A method for manufacturing the laminated rubber bearing according to claim 4.

6. In the vulcanization step, the laminate is pressurized so that the pressure decreases stepwise. A method for manufacturing the laminated rubber bearing according to claim 4.

7. In the lower steel plate arrangement step, a lower support iron plate is arranged on a lower surface of the lower steel plate, and a first locking member is used to lock the lower steel plate and the lower support iron plate together. After the lamination step, but before the upper steel plate arrangement step, a covering rubber arrangement step is carried out in which a covering rubber is arranged so as to cover the side surface of the stack and to seal the gap between the stack and the lower support iron plate; After the upper steel plate arrangement step and before the vulcanization step, an upper supporting iron plate arrangement step is performed in which an upper supporting iron plate is arranged on the upper surface of the upper steel plate so as to seal the laminate between the lower supporting iron plate and the coating rubber, and the upper steel plate and the upper supporting iron plate are locked with a second locking member; In the vulcanization step, the vulcanization is performed in a state where the side surfaces of the lower support iron plate and the upper support iron plate are supported by a mold. A method for manufacturing the laminated rubber bearing according to claim 4.

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