Cylindrical laminated rubber and axle box support device for railway vehicles

Abstract

To prevent deformation of a regulation member for preventing large displacement, and deviation of a contact position.SOLUTION: A cylindrical laminated rubber 1 comprises: an inside regulation member 10 that includes an inner cylinder 2, an outer cylinder 3 coaxially arranged outside the inner cylinder 2, a lamination part 4 provided between the inner cylinder 2 and the outer cylinder 3 and formed by laminating rubbers 5A to 5C and support plates 6A, 6B alternately in a radial direction of the outer cylinder 3, and a cavity part 7 formed in the radial direction between the inner cylinder 2 and the outer cylinder 3, and that is fixed to the inner cylinder 2 in the cavity part 7, and extends in the radial direction toward the outer cylinder 3; and an outside regulation member 20 that is fixed to the outer cylinder 3 in the cavity part 7, and extends in the radial direction toward the inner cylinder 2. The inside regulation member 10 and the outside regulation member 20 face each other in the radial direction across the cavity, and as the lamination part 4 deforms, inner facing surfaces 14a and outer facing surfaces 24a can come into contact with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a cylindrical laminated rubber bearing provided in an axle box support device of a railway vehicle, and to an axle box support device of a railway vehicle using the cylindrical laminated rubber bearing. [Background technology]

[0002] Axle box suspensions for railway vehicles are provided to elastically support the bogie frame relative to the wheelset. These axle box suspensions are comprised of coil springs that primarily bear vertical loads and cylindrical laminated rubber bearings that primarily bear horizontal loads, arranged between an axle box that supports the wheelset and the bogie frame above it. As disclosed in Patent Documents 1 and 2, for example, a cylindrical laminated rubber bearing has a structure in which a pair of laminated sections, in which rubber and metal plates are alternately laminated in the radial direction, are interposed between a metal inner tube and an outer tube arranged coaxially with the inner tube. A pair of gaps are formed between the laminated sections in the circumferential direction, and stoppers (restricting members) such as rubber or pins are provided in the gaps, fixed to either the inner tube or the outer tube and extending radially to the other side. When the axle box is displaced significantly relative to the bogie frame, the stoppers come into contact with the other side, thereby preventing large displacement of the cylindrical laminated rubber bearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-247229 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-77799 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional cylindrical laminated rubber bearings described above, the restricting member is provided only on either the inner or outer cylinder side, which makes the restricting member long in the radial direction, and therefore there is a risk of the restricting member deforming (buckling) or shifting in the contact position with the other side.

[0005] Therefore, an object of the present disclosure is to provide a cylindrical laminated rubber and a railway vehicle axle box support device that do not cause deformation of a restricting member that prevents large displacement or shifting of the contact position. [Means for solving the problem]

[0006] In order to achieve the above object, a first configuration of the present disclosure is a cylindrical laminated rubber including an inner cylinder, an outer cylinder coaxially arranged outside the inner cylinder, a laminated portion provided between the inner cylinder and the outer cylinder and formed by alternately laminating elastic members and support members in a radial direction of the outer cylinder, and a gap portion formed in the radial direction between the inner cylinder and the outer cylinder, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, The inner and outer restricting members face each other across a gap in the radial direction, and their opposing surfaces can come into contact with each other as the laminated portion deforms. At the same time, the opposing surface of the inner regulating member has a larger area than the opposing surface of the outer regulating member. It is characterized by: Another first configuration is a cylindrical laminated rubber including an inner cylinder, an outer cylinder coaxially arranged outside the inner cylinder, a laminated portion provided between the inner cylinder and the outer cylinder and formed by alternately laminating elastic members and support members in a radial direction of the outer cylinder, and a gap portion formed in the radial direction between the inner cylinder and the outer cylinder, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, the inner regulating member and the outer regulating member face each other across a gap in the radial direction, and their facing surfaces can come into contact with each other as the laminated portion deforms, and the facing surfaces have different areas; The opposing surface of the inner regulating member is longer than the opposing surface of the outer regulating member in the axial direction of the outer cylinder. Another first configuration is a cylindrical laminated rubber including an inner cylinder, an outer cylinder coaxially arranged outside the inner cylinder, a laminated portion provided between the inner cylinder and the outer cylinder and formed by alternately laminating elastic members and support members in a radial direction of the outer cylinder, and a gap portion formed in the radial direction between the inner cylinder and the outer cylinder, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, The inner and outer regulating members face each other across a gap in the radial direction, and their facing surfaces can come into contact with each other as the laminated portion deforms. The inner and outer restricting members each include a core material and a covering elastic member that covers at least the opposing surface side of the core material to form the opposing surface. Another first configuration is a cylindrical laminated rubber including an inner cylinder, an outer cylinder coaxially arranged outside the inner cylinder, a laminated portion provided between the inner cylinder and the outer cylinder and formed by alternately laminating elastic members and support members in a radial direction of the outer cylinder, and a gap portion formed in the radial direction between the inner cylinder and the outer cylinder, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, The inner and outer regulating members face each other across a gap in the radial direction, and their facing surfaces can come into contact with each other as the laminated portion deforms. a length of a contact portion of the elastic member in the laminated portion with the outer peripheral surface of the inner tube and a length of the inner regulating member are equal to or less than a length of the inner tube in the axial direction of the inner tube, and the length of the inner regulating member is equal to or less than a length of a contact portion of the elastic member in the laminated portion with the outer peripheral surface of the inner tube, In the axial direction of the outer tube, the length of the contact portion of the elastic member in the stacked portion with the inner surface of the outer tube and the length of the outer regulating member are less than the length of the outer tube, and the length of the outer regulating member is less than the length of the contact portion of the elastic member in the stacked portion with the inner surface of the outer tube. Another aspect of the present disclosure is characterized in that, in the above configuration, when the laminated portions deform and abut against each other, each of the opposing surfaces is located at a position between 1 / 3 and 2 / 3 of the radial distance from the inner tube to the outer tube. Another aspect of the present disclosure is characterized in that, in the above configuration, the opposing surfaces are planes parallel to each other. Another aspect of the present disclosure is characterized in that, in the above configuration, the core material is formed of a material harder than the covering elastic member. In another aspect of the present disclosure, in the above configuration, the inner cylinder-facing surface of the core material of the inner regulating member is a curved surface that is concentric with the inner cylinder, The outer restricting member has a core member whose surface facing the outer cylinder is a concentric circular bulge formed on the outer cylinder. In another aspect of the present disclosure, in the above configuration, the covering elastic member of the inner regulating member is connected to the elastic member of the laminated portion at an outer peripheral surface of the inner tube, The covering elastic member of the outer regulating member is characterized in that it is connected to the elastic member of the laminated portion and the inner peripheral surface of the outer cylinder. Another aspect of the present disclosure is a device according to the above configuration, wherein the covering elastic member of the inner regulating member is also interposed between the inner tube and the core material, and the covering elastic member of the outer regulating member is also interposed between the outer tube and the core material, the thickness of each of the covering elastic members on each of the opposing surfaces is equal to or less than the thickness of the covering elastic member between the inner tube and the core material and the thickness of the covering elastic member between the outer tube and the core material, The covering elastic members on the opposing surfaces when in contact with each other, and the covering elastic members between the inner tube and the core material, and between the outer tube and the core material are arranged so that the radial compressive strain is approximately the same. The term "substantially the same" is intended to allow for some degree of error, including cases where the rubber strain is the same. In order to achieve the above object, the second configuration of the present disclosure is characterized in that a coil spring and a cylindrical laminated rubber according to any one of the first configurations are arranged between an axle box that supports a wheel set and a bogie frame above it. [Effects of the Invention]

[0007] According to the present disclosure, the restricting member that suppresses large displacement is divided into an inner restricting member and an outer restricting member, and each is therefore shorter in the radial direction. This suppresses deformation (buckling) of the inner restricting member and the outer restricting member, and the occurrence of misalignment of the contact positions of the two restricting members. In addition, the degree of freedom in designing the two restricting members (structure, strength, material) is increased. According to the first configuration In addition to the above effects, since the opposing surface of the inner regulating member has a larger area than the opposing surface of the outer regulating member, the larger area of ​​the opposing surface can absorb any relative misalignment between the opposing surfaces. According to another first configuration In addition to the above effects, since the areas of the opposing surfaces are different from each other, deviation of the contact position can be tolerated, and a constant contact area can be maintained even during deformation. Also Since the opposing surface of the inner regulating member is longer in the axial direction of the outer cylinder than the opposing surface of the outer regulating member, relative misalignment in the axial direction can be effectively compensated for. According to another first configuration In addition to the above effects, the inner and outer regulating members are made of a core material and a covering elastic member, which provides a shock absorbing effect when the two regulating members first come into contact, and any deviation in the contact angle between them can be absorbed by the covering elastic member. Furthermore, the two regulating members can be vulcanization bonded to the inner and outer tubes via the covering elastic member. According to another first configuration In addition to the above effects, the innermost elastic member and inner restricting member of the laminated portion are the same length as or shorter than the inner cylinder, and the outermost elastic member and outer restricting member are the same length as or shorter than the outer cylinder, so damage to the elastic members and both restricting members is suppressed. Also, because both restricting members are shorter than the length of the elastic member, both restricting members do not hinder axial deformation of the laminated portion. According to another aspect of the present disclosure, in addition to the above effects, when the laminated portions are deformed and come into contact with each other, the opposing surfaces are located at a position 1 / 3 to 2 / 3 of the radial distance from the inner tube to the outer tube, so that if both restricting members are formed with the same radial length, they can have the same strength. Furthermore, even if the radial lengths of both restricting members are different, it is easy to achieve the same strength by adjusting the shape and material of each. According to another aspect of the present disclosure, in addition to the above-described effects, the opposing surfaces are planar and parallel to each other, so that the surface contact between the two restricting members is facilitated even if the relative positions of the two restricting members change. According to another aspect of the present disclosure, in addition to the above-described effects, the core material is formed of a material harder than the covering elastic member, so that the strength of both restricting members can be maintained. According to another aspect of the present disclosure, in addition to the above-mentioned effects, the inner restricting member has a curved surface facing the inner tube on the core material, and the outer restricting member has a bulged surface facing the outer tube on the core material, making it easier to fix both restricting members to the inner and outer tubes. Furthermore, since the impact when the opposing surfaces come into contact with each other is transmitted evenly to the inner and outer tubes, damage to both restricting members due to stress concentration is suppressed. According to another aspect of the present disclosure, in addition to the above-mentioned effects, the covering elastic members of the inner and outer restricting members are connected to the elastic members of the laminated portion, which makes it easier to mold both restricting members and also helps prevent peeling of the covering elastic members. According to another aspect of the present disclosure, in addition to the above effects, the thickness of each covering elastic member on each opposing surface is less than the thickness of the covering elastic member between the inner tube and the core material and the thickness of the covering elastic member between the outer tube and the core material, and the covering elastic members on each opposing surface when in contact with each other, and the covering elastic members between the inner tube and the core material and between the outer tube and the core material are arranged so that the radial compressive strain is approximately the same, thereby making it possible to suppress deformation and damage due to stress concentration in the low rigidity portions when the two regulating members come into contact. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view of a cylindrical laminated rubber member. [Figure 2] FIG. 2 is a front view of the cylindrical laminated rubber. [Figure 3] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Figure 5] FIG. 3 is a cross-sectional view taken along line CC in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Fig. 1 is a plan view showing an example of a cylindrical laminated rubber bearing. Fig. 2 is a front view of the cylindrical laminated rubber bearing. Fig. 3 is a cross-sectional view taken along line AA in Fig. 1, and Fig. 4 is a cross-sectional view taken along line BB. For convenience, the upper side of Fig. 1 is the front, and the upper side of Fig. 2 is the top, defining the front-rear, left-right, and up-down directions. The cylindrical laminated rubber 1 comprises an inner cylinder 2 that is circular in plan view and located at the center, and an outer cylinder 3 that is circular in plan view and coaxially arranged outside the inner cylinder 2. The length L1 of the inner cylinder 2 in the vertical direction (axial direction) is longer than the length L2 of the outer cylinder 3 in the vertical direction. The outer cylinder 3 is located at approximately the middle position of the inner cylinder 2 in the vertical direction.

[0010] A pair of laminated sections 4, 4 is provided between the inner tube 2 and the outer tube 3. Each laminated section 4 is formed by alternately laminating rubbers 5A, 5B, 5C and support plates 6A, 6B in the radial direction of the outer tube 3, starting from the inner tube 2 side and forming a concentric arc shape with the inner tube 2 in a plan view. The rubbers 5A-5C are vulcanization-bonded to the support plates 6A, 6B. The innermost rubber 5A is vulcanization-bonded to the outer peripheral surface of the inner tube 2, and the outermost rubber 5C is vulcanization-bonded to the inner peripheral surface of the outer tube 3. The support plates 6A, 6B are shorter in the vertical direction than the inner tube 2 and longer than the outer tube 3, with the inner support plate 6A being longer than the outer support plate 6B. Of the rubbers 5A-5C, the innermost rubber 5A is the longest in the vertical direction, followed by the rubbers 5B, 5C in order of decreasing length. The laminated portions 4, 4 are fan-shaped in plan view and are arranged at positions symmetrical on the left and right sides of a point centered on the inner tube 2. Therefore, a pair of gaps 7, 7 are formed between the laminated portions 4, 4 between the inner tube 2 and the outer tube 3, symmetrical in the front and rear directions with the inner tube 2 as the center.

[0011] An inner restricting member 10 and an outer restricting member 20 are provided in each of the gaps 7 . The inner restricting member 10 is composed of an inner core material 11 and a covering rubber 12 that covers the outer surface of the inner core material 11. As shown in Figures 3 and 5, the inner core material 11 is a rectangular column that is rectangular in plan view and extends in the vertical direction. The radially inner outer surface of the inner core material 11 forms a curved surface 11a that is concentric with the outer peripheral surface of the opposing inner tube 2. The radially outer outer surface of the inner core material 11 forms a flat surface 11b that is defined by the vertical and horizontal directions. The covering rubber 12 is vulcanization bonded to the inner core material 11 so as to cover the front, rear, left and right outer surfaces of the inner core material 11 except for the upper and lower end surfaces of the inner core material 11. In the covering rubber 12, an inner covering portion 13 located radially inside the inner core material 11 is vulcanization bonded to the outer peripheral surface of the inner tube 2. Therefore, the inner restricting member 10 is supported in a state where it protrudes radially outward from the inner tube 2. The inner covering portion 13 is connected to the innermost rubbers 5A, 5A of each laminated portion 4 and the outer peripheral surface of the inner tube 2. In the covering rubber 12, the outer surface of the outer covering portion 14 located radially outside the inner core material 11 forms an inner opposing surface 14a that is parallel to the flat surface 11b of the inner core material 11.

[0012] The outer restricting member 20 is made up of an outer core material 21 and a covering rubber 22 that covers the outer surface of the outer core material 21. As shown in Figures 3 and 5, the outer core material 21 is a rectangular column that is rectangular in plan view and extends in the up-down direction. The outer surface on the radially outer side of the outer core material 21 forms a bulging surface 21a that is concentric with the outer peripheral surface of the opposing outer cylinder 3. The outer surface on the radially inner side of the outer core material 21 forms a flat surface 21b that is defined in the up-down and left-right directions. The covering rubber 22 is bonded to the outer core material 21 in a manner that covers the front, rear, left, and right outer surfaces of the outer core material 21 except for the upper and lower end surfaces of the outer core material 21. In the covering rubber 22, an inner covering portion 23 located radially outside the outer core material 21 is vulcanization bonded to the inner circumferential surface of the outer tube 3. Therefore, the outer restricting member 20 is supported in a state that it protrudes radially inward from the outer tube 3. In the covering rubber 22, the outer surface of the outer covering portion 24 located radially inside the outer core material 21 forms an outer facing surface 24a that is parallel to the flat surface 21b of the outer core material 21. Therefore, the inner facing surface 14a of the outer covering portion 14 of the inner restricting member 10 and the outer facing surface 24a of the outer covering portion 24 of the outer restricting member 20 are parallel to each other. The inner covering portion 23 is connected to the outermost rubber portions 5C, 5C of the laminate portion 4 via thin rubber portions 25, 25 adhered to the inner peripheral surface of the outer cylinder 3.

[0013] The inner regulating member 10 and the outer regulating member 20 have the same width in the left-right direction, but the length in the up-down direction of the inner regulating member 10 (L3 shown in FIG. 3: the actual length defined by the inner core material 11) is longer than the length in the up-down direction of the outer regulating member 20 (L4 shown in FIG. 3: the actual length defined by the outer core material 21). The inner core material 11 and the outer core material 21 also have the same width in the left-right direction, but the length in the up-down direction of the inner core material 11 is longer than the outer core material 21. In the vertical direction, the length L3 of the inner restricting member 10 is shorter than the length L1 of the inner cylinder 2. The length L4 of the outer restricting member 20 is shorter than the length L2 of the outer cylinder 3. The amount of protrusion (radial distance) of the inner regulating member 10 from the outer peripheral surface of the inner cylinder 2 and the amount of protrusion (radial distance) of the outer regulating member 20 from the inner peripheral surface of the outer cylinder 3 are equal to each other, and each protrusion amount is shorter than half the radial distance between the outer peripheral surface of the inner cylinder 2 and the inner peripheral surface of the outer cylinder 3. Therefore, the inner opposing surface 14a of the inner regulating member 10 and the outer opposing surface 24a of the outer regulating member 20 face each other with a predetermined radial gap maintained therebetween.

[0014] 5, the radial thicknesses t1 and t2 of the opposing outer covering portions 14 and 24 are equal to each other. Furthermore, the radial thicknesses t1 and t2 are thinner than the radial thickness t3 of the inner covering portion 13 between the inner tube 2 and the inner core member 11 and the radial thickness t4 of the inner covering portion 23 between the outer tube 3 and the outer core member 21. In addition, in the vertical direction, the length (L5 shown in FIG. 4) of the adhesive portion of the innermost rubber 5A in the laminated portion 4 to the outer circumferential surface of the inner tube 2 and the length L3 of the inner regulating member 10 are shorter than the length L1 of the inner tube 2. Furthermore, the length L3 of the inner regulating member 10 is shorter than the length L5 of the adhesive portion of the innermost rubber 5A. Furthermore, in the vertical direction, the length (L6 shown in FIG. 4) of the adhesive portion of the outermost rubber 5C in the laminated portion 4 bonded to the inner circumferential surface of the outer tube 3 is equal to the length L2 of the outer tube 3. Furthermore, the length L4 of the outer restricting member 20 is shorter than the length L2 of the outer tube 3. Furthermore, the length L4 of the outer restricting member 20 is shorter than the length L6 of the adhesive portion of the outermost rubber 5C.

[0015] The cylindrical laminated rubber bearing 1 configured as described above is provided in an axle box suspension of a railway vehicle to elastically support the bogie frame relative to the wheelset. The axle box suspension has a well-known structure with a coil spring that receives loads mainly in the vertical direction, placed between an axle box that supports the wheelset and the bogie frame above it. The cylindrical laminated rubber bearing 1 is arranged coaxially with the coil spring, between the axle box and the bogie frame, with the inner cylinder 2 fixed to the bogie frame and the outer cylinder 3 fixed to the axle box in the same longitudinal direction as in Figure 1. Therefore, the cylindrical laminated rubber 1 is subjected to a load mainly in the horizontal direction. When a load is applied in the front-to-rear direction, the laminated portions 4, 4 undergo shear deformation, and when a load is applied in the left-to-right direction, the laminated portions 4, 4 undergo compression deformation, thereby providing a cushioning effect. When the relative displacement of the axle box relative to the bogie frame in the longitudinal direction increases during acceleration or deceleration, the laminated portions 4, 4 undergo large shear deformation. As a result, the inner restricting member 10 and the outer restricting member 20, which are located at either the front or rear of the inner cylinder 2, approach each other, causing the inner opposing surface 14a and the outer opposing surface 24a to abut against each other. This makes it possible to suppress large displacements of the cylindrical laminated rubber 1.

[0016] In particular, the inner and outer restricting members 10 and 20 abut against each other at their outer covering portions 14 and 24, providing a cushioning effect. Furthermore, the outer covering portions 14 and 24, and the inner covering portions 13 and 23 are designed to have substantially the same radial compressive strain when in abutment with each other. Therefore, the covering portions 13, 14, 23, and 24 are elastically deformed evenly, making it difficult for localized stress concentrations to occur. The inner and outer regulating members 10 and 20 each have the same amount of protrusion from the outer peripheral surface of the inner tube 2 and the inner peripheral surface of the outer tube 3, and the inner opposing surface 14a of the inner regulating member 10 and the outer opposing surface 24a of the outer regulating member 20 abut against each other at approximately half the radial distance between the inner tube 2 and the outer tube 3. Therefore, the radial lengths of the inner and outer regulating members 10 and 20 are each shortened, making it less likely that the two regulating members 10, 20 will deform (buckle) or that the abutting positions of the inner opposing surfaces 14a and the outer opposing surfaces 24a will shift.

[0017] As described above, the cylindrical laminated rubber 1 of the above embodiment includes the inner cylinder 2, the outer cylinder 3 coaxially disposed outside the inner cylinder 2, a laminated portion 4 provided between the inner cylinder 2 and the outer cylinder 3 and formed by alternately laminating rubbers 5A to 5C (elastic members) and support plates 6A, 6B (support members) in the radial direction of the outer cylinder 3, and a gap 7 formed in the radial direction between the inner cylinder 2 and the outer cylinder 3. The cylindrical laminated rubber 1 further includes an inner regulating member 10 fixed to the inner cylinder 2 within the gap 7 and extending radially toward the outer cylinder 3, and an outer regulating member 20 fixed to the outer cylinder 3 within the gap 7 and extending radially toward the inner cylinder 2, the inner regulating member 10 and the outer regulating member 20 facing each other across a gap in the radial direction, and the inner opposing surfaces 14a and the outer opposing surfaces 24a (facing surfaces) of the inner and outer regulating members 10 and 20 can come into contact with each other as the laminated portion 4 deforms. According to this configuration, the restricting member that suppresses large displacement is divided into the inner restricting member 10 and the outer restricting member 20, and each is therefore shorter in the radial direction. This suppresses deformation (buckling) of the inner restricting member 10 and the outer restricting member 20 and the occurrence of misalignment of the contact positions of the two restricting members 10, 20. This also increases the degree of freedom in designing the two restricting members 10, 20 (structure, strength, material). Therefore, for example, it may be possible to use a material with lower strength than in the case of a single restricting member.

[0018] In particular, the inner opposing surface 14a and the outer opposing surface 24a have different areas, which allows for deviation of the contact position and makes it possible to maintain a constant contact area even during deformation. In this case, since the inner facing surface 14a has a larger area than the outer facing surface 24a, the inner facing surface 14a can absorb any relative misalignment of the outer facing surface 24a. Since the inner facing surface 14a is longer in the vertical direction than the outer facing surface 24a, the inner facing surface 14a can effectively accommodate any relative misalignment in the vertical direction. When the laminated portion 4 is deformed and comes into contact with each other, the inner opposing surface 14a and the outer opposing surface 24a are located at half the radial distance from the inner tube 2 to the outer tube 3. Therefore, both restricting members 10, 20 can be formed to have the same radial length, and can be designed to have the same strength, etc. The inner and outer opposing surfaces 14a and 24a are flat surfaces parallel to each other, which facilitates surface contact between the two restricting members 10 and 20 even if the relative positions of the restricting members 10 and 20 change.

[0019] The inner and outer regulating members 10 and 20 are made of inner and outer core materials 11 and 21, respectively, and covering rubber 12 and 22 (covering elastic members) that cover the inner and outer core materials 11 and 21 to form the inner and outer opposing surfaces 14a and 24a. This provides a shock-absorbing effect when the two regulating members 10 and 20 initially come into contact, and any deviation in the contact angle can be absorbed by the covering rubber 12 and 22. Furthermore, the two regulating members 10 and 20 can be bonded to the inner and outer tubes 2 and 3 by vulcanization via the covering rubber 12 and 22. This also helps prevent corrosion of the metallic inner and outer core materials 11 and 21. The inner core material 11 and the outer core material 21 are made of metal (a material harder than the covering rubbers 12 and 22), so that the strength of both the restricting members 10 and 20 can be maintained. The surface of the inner core material 11 of the inner regulating member 10 facing the inner tube 2 (inner tube facing surface) is a curved surface 11a that is concentric with the inner tube 2, and the surface of the outer core material 21 of the outer regulating member 20 facing the outer tube 3 (outer tube facing surface) is a bulging surface 21a that is concentric with the outer tube 3. This makes it easy to fix both regulating members 10, 20 to the inner tube 2 and the outer tube 3. Furthermore, since the impact generated when the inner facing surface 14a and the outer facing surface 24a come into contact is transmitted evenly to the inner tube 2 and the outer tube 3, damage to both regulating members 10, 20 due to stress concentration is suppressed.

[0020] The covering rubber 12 of the inner regulating member 10 is connected to the rubber 5A, 5A of the laminated portions 4, 4 on the outer peripheral surface of the inner tube 2, and the covering rubber 22 of the outer regulating member 20 is connected to the rubber 5C, 5C of the laminated portions 4, 4 on the inner peripheral surface of the outer tube 3 via the rubber 25, 25. This makes it easier to mold both regulating members 10, 20. It also helps prevent the covering rubber 12, 22 from peeling off. The covering rubber 12 of the inner regulating member 10 is also interposed as an inner covering portion 13 between the inner tube 2 and the inner core 11, and the covering rubber 22 of the outer regulating member 20 is also interposed as an inner covering portion 23 between the outer tube 3 and the outer core 21, and the thicknesses of the outer covering portion 14 of the inner opposing surface 14a and the outer covering portion 24 of the outer opposing surface 24a are equal to or less than the thicknesses of the inner covering portions 13, 23. Furthermore, the outer covering portions 14, 24 of the inner opposing surface 14a and the outer opposing surface 24a and the inner covering portions 13, 23 are arranged so that when they abut against each other, the radial compressive strains of these portions are approximately the same. This prevents deformation and damage due to stress concentration in the low-rigidity portions when the two regulating members 10, 20 abut against each other.

[0021] In the axial direction of the inner tube 2, the length L5 of the contact portion of the rubber 5A in the laminated portion 4 with the outer peripheral surface of the inner tube 2 and the length L3 of the inner regulating member 10 are shorter than the length L1 of the inner tube 2, and the length L3 of the inner regulating member 10 is shorter than the length L5 of the contact portion of the rubber 5A with the outer peripheral surface of the inner tube 2. In addition, in the axial direction of the outer tube 3, the length L6 of the contact portion of the rubber 5C with the inner peripheral surface of the outer tube 3 is equal to the length L2 of the outer tube 3, and the length L4 of the outer regulating member 20 is shorter than the length L2 of the outer tube 3. In other words, because the rubber 5A and the inner regulating member 10 are shorter than the inner tube 2, and the rubber 5C and the outer regulating member 20 are the same length as or shorter than the outer tube 3, damage to the rubbers 5A, 5C and the regulating members 10, 20 is suppressed. Furthermore, since the length of both the restricting members 10 and 20 is equal to or less than the length of the rubbers 5A and 5C, the restricting members 10 and 20 do not hinder the deformation of the laminated portion 4 in the axial direction.

[0022] An example of the modification will be described below. In the above embodiment, the inner opposing surface of the inner regulating member and the outer opposing surface of the outer regulating member have different areas so that the inner opposing surface is longer in the vertical direction, but the area may be different so that the inner opposing surface is larger in the circumferential direction by increasing the left-right width of the inner regulating member instead of the vertical direction. The area of ​​the inner opposing surface may be larger in both the vertical direction and the circumferential direction. Conversely, the area of ​​the outer opposing surface may be larger than the area of ​​the inner opposing surface, or the areas of the inner opposing surface and the outer opposing surface may be equal. The inner and outer restricting members are not limited to having the same width in the radial direction. For example, they may have a tapered shape (trapezoidal shape in plan view) in which the width decreases from the fixed side with the inner or outer tube toward the opposing surface. The same applies to the core material (including the inner core material and the outer core material, the same applies hereinafter).

[0023] The contact position between the inner and outer opposing surfaces is not limited to 1 / 2 of the radial distance between the inner and outer cylinders, but may be between 1 / 3 and 2 / 3. In this case, it is also possible to design both restricting members in a substantially similar manner. The inner and outer facing surfaces are not limited to being flat surfaces, and may not be parallel to each other as long as there is no effect of stress concentration. The covering rubber is not limited to covering the front, back, left, and right sides of the core material, but may also cover the top and bottom surfaces of the core material. The covering rubber needs to be on at least the opposing surfaces. Therefore, the inner covering portion may be omitted and the core material may be fixed directly to the inner and outer tubes. In this case, the core material may be formed integrally with the inner and outer tubes. The covering rubber itself may also be omitted. The core material is not limited to metal, and may be made of a material such as resin as long as it is harder than the covering rubber. A plurality of core materials and covering rubbers may be stacked in the radial direction. The surfaces of the core member facing the inner and outer cylinders do not have to be curved or bulged. For example, they may be flat. The inner and outer restricting members do not have to have the same structure. For example, one restricting member may have a structure without a core material or without a rubber covering, and so long as the desired cushioning effect is obtained, they may have different structures.

[0024] The inner covering portions of the inner and outer regulating members may be configured so as not to be connected to the rubber of the laminated portion. The relationship in radial thickness between the outer covering portion and the inner covering portion of the inner and outer restricting members is not limited to the above-described embodiment. For example, each outer covering portion may have the same thickness as each inner covering portion, or each outer covering portion may have a greater thickness than each inner covering portion. The compressive strain in the radial direction when the outer covering portions of the inner and outer restricting members come into contact with each other does not have to be the same as the compressive strain of each inner covering portion, provided that there is no effect of stress concentration. In the above embodiment, the vertical length L3 of the inner restraining member is shorter than the length L5 of the innermost rubber of the laminated portion where the innermost rubber abuts against the outer circumferential surface of the inner tube, but the length L3 of the inner restraining member may be the same as the length L5 of the innermost rubber. The length L5 of the abutting portion may be the same as the length L1 of the inner tube 2. The length L6 of the outermost rubber of the laminated portion where it abuts against the inner circumferential surface of the outer cylinder is equal to the length L2 of the outer cylinder, but the length L6 of the outermost rubber may be shorter than the length L2 of the outer cylinder. Furthermore, the length L4 of the outer restricting member may be equal to the length L6 of the outermost rubber.

[0025] In addition, the number (layers) of rubber and support plates in the laminated portion can be increased or decreased as appropriate, and the shape of the support plate can also be changed as appropriate. The shapes of the laminated portion and the gap portion are not limited to the above-described forms. [Explanation of symbols]

[0026] 1·· Cylindrical laminated rubber, 2·· Inner cylinder, 3·· Outer cylinder, 4·· Lamination portion, 5A to 5C, 25·· Rubber, 6A, 6B·· Support plate, 7·· Gap portion, 10·· Inner regulating member, 11·· Inner core material, 11a·· Curved surface, 11b, 21b·· Flat surface, 12, 22·· Covering rubber, 13, 23·· Inner covering portion, 14, 24·· Outer covering portion, 14a·· Inner opposing surface, 20·· Outer regulating member Control member, 21... outer core material, 21a... bulging surface, 24a... outer opposing surface, L1... vertical length of inner tube, L2... vertical length of outer tube, L3... vertical length of inner control member, L4... vertical length of outer control member, L5... vertical length of contact portion of innermost rubber with outer peripheral surface of inner tube, L6... vertical length of contact portion of outermost rubber with inner peripheral surface of outer tube.

Claims

1. A cylindrical laminated rubber comprising: an inner cylinder; an outer cylinder coaxially disposed outside the inner cylinder; a laminated portion provided between the inner cylinder and the outer cylinder, the laminated portion being formed by alternately laminating elastic members and support members in a radial direction of the outer cylinder; and a gap portion formed in the radial direction between the inner cylinder and the outer cylinder, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, The inner regulating member and the outer regulating member face each other in the radial direction via a gap, and their opposing surfaces can abut against each other as the laminated portion deforms, and the opposing surface of the inner regulating member has a larger area than the opposing surface of the outer regulating member.

2. A cylindrical laminated rubber comprising an inner tube, an outer tube arranged coaxially outside the inner tube, a laminated section provided between the inner tube and the outer tube and formed by alternately laminating elastic members and support members in the radial direction of the outer tube, and a void section formed in the radial direction between the inner tube and the outer tube, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, the inner regulating member and the outer regulating member face each other across a gap in the radial direction, and their facing surfaces can come into contact with each other as the laminated portion deforms, and the facing surfaces have different areas; The cylindrical laminated rubber bearing, wherein the opposing surface of the inner regulating member is longer than the opposing surface of the outer regulating member in the axial direction of the outer cylinder.

3. A cylindrical laminated rubber comprising an inner tube, an outer tube arranged coaxially outside the inner tube, a laminated section provided between the inner tube and the outer tube and formed by alternately laminating elastic members and support members in the radial direction of the outer tube, and a void section formed in the radial direction between the inner tube and the outer tube, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, The inner and outer regulating members face each other across a gap in the radial direction, and their facing surfaces can come into contact with each other as the laminated portion deforms. The cylindrical laminated rubber characterized in that the inner regulating member and the outer regulating member each comprise a core material and a covering elastic member that covers at least the opposing surface side of the core material to form the opposing surface.

4. A cylindrical laminated rubber comprising an inner tube, an outer tube arranged coaxially outside the inner tube, a laminated section provided between the inner tube and the outer tube and formed by alternately laminating elastic members and support members in the radial direction of the outer tube, and a void section formed in the radial direction between the inner tube and the outer tube, an inner regulating member fixed to the inner cylinder within the gap and extending in the radial direction toward the outer cylinder; an outer restricting member fixed to the outer cylinder within the gap and extending in the radial direction toward the inner cylinder, The inner and outer regulating members face each other across a gap in the radial direction, and their facing surfaces can come into contact with each other as the laminated portion deforms. a length of a contact portion of the elastic member in the laminated portion with the outer peripheral surface of the inner tube and a length of the inner regulating member are equal to or less than a length of the inner tube in the axial direction of the inner tube, and the length of the inner regulating member is equal to or less than a length of a contact portion of the elastic member in the laminated portion with the outer peripheral surface of the inner tube, a length of the outer regulating member and a length of the elastic member in the laminated portion that abuts against the inner peripheral surface of the outer cylinder in the axial direction of the outer cylinder, the length of the outer regulating member being equal to or less than the length of the outer cylinder, and the length of the outer regulating member being equal to or less than the length of the outer cylinder,

5. 5. The cylindrical laminated rubber according to claim 1, wherein each of the opposing surfaces is located at a position that is 1 / 3 to 2 / 3 of the radial distance from the inner tube to the outer tube when the laminated portions are deformed and come into contact with each other.

6. 6. The cylindrical laminated rubber bearing according to claim 1, wherein the opposing surfaces are flat surfaces parallel to each other.

7. 4. The cylindrical laminated rubber according to claim 3, wherein the core material is made of a material harder than the covering elastic member.

8. The inner cylinder-facing surface of the core material of the inner regulating member is a curved surface that is concentric with the inner cylinder, 8. The cylindrical laminated rubber according to claim 3, wherein the surface of the core material of the outer restricting member facing the outer cylinder is a bulging surface that is concentric with the outer cylinder.

9. the covering elastic member of the inner regulating member is connected to the elastic member of the laminated portion on the outer circumferential surface of the inner tube, 9. The cylindrical laminated rubber according to claim 3, wherein the covering elastic member of the outer restricting member is connected to the elastic member of the laminated portion on the inner peripheral surface of the outer cylinder.

10. the covering elastic member of the inner regulating member is also interposed between the inner tube and the core material, and the covering elastic member of the outer regulating member is also interposed between the outer tube and the core material, the thickness of each of the covering elastic members on each of the opposing surfaces is equal to or less than the thickness of the covering elastic member between the inner tube and the core material and the thickness of the covering elastic member between the outer tube and the core material, 10. The cylindrical laminated rubber according to claim 3, wherein the covering elastic members on the opposing surfaces in abutting contact with each other, the covering elastic members between the inner tube and the core material, and the covering elastic members between the outer tube and the core material are arranged so that the compressive strains in the radial direction are substantially the same.

11. 11. An axle box support device for a railway vehicle, comprising: an axle box supporting a wheel set; and a bogie frame above the axle box, wherein a coil spring and the cylindrical laminated rubber bearing according to claim 1 are disposed between the axle box and the bogie frame.

Images