JP7763131B2 - Cylindrical laminated rubber and axle box support device for railway vehicles - Google Patents

Description

This disclosure relates to a cylindrical laminated rubber bearing provided in an axle box support device of a railway vehicle, and to a railway vehicle axle box support device using the cylindrical laminated rubber bearing.

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.

Japanese Patent Application Laid-Open No. 2008-247229 JP 2012-77799 A

In the conventional cylindrical laminated rubber described above, the restricting member is provided on only one of the inner and outer cylinder sides, which makes the restricting member long in the radial direction. This raises the risk of the restricting member deforming (buckling) or shifting its contact position with the other side.

The present disclosure therefore aims to provide a cylindrical laminated rubber bearing and a railway vehicle axle box support device that prevents deformation of the restricting member that prevents large displacement and does not cause misalignment of the contact position.

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 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 .
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 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.
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 that is 1/3 to 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 described in any one of the first configurations are arranged between an axle box body that supports the wheel set and a bogie frame above it.

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 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, the opposing surface of the inner regulating member has a larger area than the opposing surface of the outer regulating member, so that the larger area of the opposing surface can absorb any relative misalignment between the opposing surfaces.
According to the first alternative configuration , in addition to the above-mentioned 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.
Furthermore , since the opposing surface of the inner restricting member is longer in the axial direction of the outer cylinder than the opposing surface of the outer restricting member, relative misalignment in the axial direction can be effectively compensated for.
According to the first alternative configuration , in addition to the above-mentioned effects, the inner and outer restricting members are made of a core material and a covering elastic member, so that an impact cushioning effect is obtained when the two restricting members initially come into contact, and any deviation in the angle of contact between them can be absorbed by the covering elastic member. Furthermore, the two restricting members can be vulcanization-bonded to the inner and outer tubes via the covering elastic member.
According to the first alternative configuration , in addition to the above-mentioned effects, the innermost elastic member and inner restricting member of the stacked 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 that damage to the elastic members and both restricting members is suppressed. Furthermore, because both restricting members are shorter than the length of the elastic member, both restricting members do not hinder axial deformation of the stacked portion.
According to another aspect of the present disclosure, in addition to the above-described effects, when the laminated portions are deformed and come into contact with each other, the opposing surfaces are located at a position that is 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 to have 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.

FIG. 2 is a plan view of a cylindrical laminated rubber member. FIG. 2 is a front view of the cylindrical laminated rubber. 2 is a cross-sectional view taken along line AA in FIG. 1. 2 is a cross-sectional view taken along line BB in FIG. 1. 3 is a cross-sectional view taken along line CC in FIG. 2.

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 A-A in Fig. 1, and Fig. 4 is a cross-sectional view taken along line B-B in Fig. 1. 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 bearing 1 comprises an inner cylinder 2 that is circular in plan view and located at the center, and an outer cylinder 3 that is also 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.

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, which are concentrically arcuate with the inner tube 2 in a plan view, from the inner tube 2 side, in the radial direction of the outer tube 3. 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 than the inner tube 2 and longer than the outer tube 3 in the vertical direction, 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 that order.
The laminated portions 4, 4 are fan-shaped in plan view and are arranged in left-right point symmetry positions 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, symmetrically in the front-rear direction centered on the inner tube 2.

An inner restricting member 10 and an outer restricting member 20 are provided in each gap 7 .
The inner restricting member 10 is composed of an inner core 11 and a covering rubber 12 that covers the outer surface of the inner core 11. As shown in Figures 3 and 5, the inner core 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 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 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 11 so as to cover the front, rear, left, and right outer surfaces of the inner core 11 except for the upper and lower end surfaces of the inner core 11. In the covering rubber 12, an inner covering portion 13 located radially inside the inner core 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 at 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 outward of the inner core material 11 forms an inner opposing surface 14 a that is parallel to the flat surface 11 b of the inner core material 11 .

The outer restricting member 20 is composed 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 of the outer core material 21 on the radially outer side forms a bulging surface 21a that is concentric with the outer peripheral surface of the opposing outer tube 3. The outer surface of the outer core material 21 on the radially inner side 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 outward of 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 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 5 C, 5 C of the laminated portion 4 via thin rubber portions 25 , 25 adhered to the inner peripheral surface of the outer cylinder 3 .

The inner and outer restricting members 10 and 20 have the same width in the left-right direction, but the length in the up-down direction of the inner restricting 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 restricting member 20 (L4 shown in FIG. 3: the actual length defined by the outer core material 21). The inner and outer core materials 11 and 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 that of 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 tube 2 and the amount of protrusion (radial distance) of the outer regulating member 20 from the inner peripheral surface of the outer tube 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 tube 2 and the inner peripheral surface of the outer tube 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.

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 material 11 and the radial thickness t4 of the inner covering portion 23 between the outer tube 3 and the outer core material 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 with the outer circumferential surface of the inner tube 2 and the length L3 of the inner restricting member 10 are shorter than the length L1 of the inner tube 2. Furthermore, the length L3 of the inner restricting 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 attached 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 regulating member 20 is shorter than the length L2 of the outer tube 3. Furthermore, the length L4 of the outer regulating member 20 is shorter than the length L6 of the adhesive portion of the outermost rubber 5C.

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 in which a coil spring is provided between an axle box supporting the wheelset and the bogie frame above it, and which receives loads mainly in the vertical direction. 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-rear direction, the laminated portions 4, 4 undergo shear deformation, and when a load is applied in the left-right direction, the laminated portions 4, 4 undergo compression deformation, thereby exerting a buffering 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 and outer restricting members 10, 20, located at either the front or rear of the inner cylinder 2, approach each other, causing the inner and outer opposing surfaces 14a, 24a to come into contact with each other. This makes it possible to suppress large displacements of the cylindrical laminated rubber 1.

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 compressive strain in the radial direction when they are in abutting contact 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 restricting members 10 and 20 protrude from the outer peripheral surface of the inner tube 2 and the inner peripheral surface of the outer tube 3 by the same amount, and the inner opposing surface 14a of the inner restricting member 10 and the outer opposing surface 24a of the outer restricting member 20 abut against each other at approximately half the radial distance between the inner tube 2 and the outer tube 3. This shortens the radial lengths of the inner restricting member 10 and the outer restricting member 20, making it less likely that the two restricting 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.

Thus, 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 restraining member that suppresses large displacement is divided into two, the inner restraining member 10 and the outer restraining member 20, and each is shorter in the radial direction. This prevents deformation (buckling) of the inner restraining member 10 and the outer restraining member 20 and prevents misalignment of the contact positions of the two restraining members 10, 20. This also increases the degree of freedom in designing the two restraining 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 restraining member.

In particular, the inner facing surface 14a and the outer facing 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 14 a has a larger area than the outer facing surface 24 a, the inner facing surface 14 a can absorb the relative misalignment of the outer facing surface 24 a. Since the inner facing surface 14 a is longer in the vertical direction than the outer facing surface 24 a, the relative misalignment in the vertical direction can be effectively accommodated.
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 a position that is 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 planar surfaces parallel to each other, so that the two restricting members 10 and 20 can easily come into surface contact with each other even if the relative positions of the restricting members 10 and 20 change.

The inner and outer restricting members 10 and 20 are made of inner and outer core materials 11 and 21, respectively, and rubber coverings 12 and 22 (elastic covering 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 restricting members 10 and 20 initially contact each other, and the rubber coverings 12 and 22 can absorb any misalignment in the contact angle. Furthermore, the restricting members 10 and 20 can be bonded to the inner and outer tubes 2 and 3 by vulcanization via the rubber coverings 12 and 22. This also helps prevent corrosion of the metal inner and outer core materials 11 and 21.
The inner core member 11 and the outer core member 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 restricting 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 restricting 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 restricting 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 restricting members 10, 20 due to stress concentration is suppressed.

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 material 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 material 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 makes it possible to prevent deformation and damage due to stress concentration in the low-rigidity portions when the two regulating members 10, 20 abut against each other.

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. Furthermore, 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 in the laminated portion 4 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 L6 of the contact portion of the rubber 5C with the inner peripheral surface of the outer tube 3. In other words, because the rubber 5A and inner regulating member 10 are shorter than the inner tube 2, and the rubber 5C and outer regulating member 20 are the same length as or shorter than the outer tube 3, damage to the rubbers 5A and 5C and the regulating members 10 and 20 is suppressed. Furthermore, by making the length of both restricting members 10, 20 shorter than that of the rubber members 5A, 5C, the restricting members 10, 20 do not impede the axial deformation of the laminated portion 4.

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 be tapered (trapezoidal in plan view) so that the width decreases from the fixed side with the inner or outer tube toward the opposing surface. The same applies to the core (including the inner core and outer core, hereinafter).

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.

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 regulating member is shorter than the length L5 of the contact portion of the innermost rubber of the laminated portion with the outer circumferential surface of the inner tube, but the length L3 of the inner regulating member may be the same as the length L5 of the innermost rubber. The length L5 of the contact 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.

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.

1... Cylindrical laminated rubber, 2... Inner cylinder, 3... Outer cylinder, 4... Laminated portion, 5A-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 Restriction 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 restricting member, L4... vertical length of outer restricting 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 (11)

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 . 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 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. 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 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. 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 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, A cylindrical laminated rubber member as described in any one of claims 1 to 4, characterized in that when the laminated portions deform and come into contact with each other, 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. A cylindrical laminated rubber bearing according to any one of claims 1 to 5, characterized in that each of the opposing surfaces is a plane parallel to each other. 4. The cylindrical laminated rubber according to claim 3 , wherein the core material is made of a material harder than the covering elastic member. 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. 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. 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. 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.