Seismic isolation or vibration control mechanism

Abstract

To provide a seismic isolation or vibration damping mechanism for seismic isolation or vibration damping.SOLUTION: In place of a conventional seismic isolation or vibration damping mechanism for seismic isolation or damping, a mechanism includes a pedestal having a pedestal body and rail members, and a bogie having a bogie body, an axle shaft, and rolling elements, the mechanism further has N (N=2, 3 ...) axle outer diameters, where the outer circumference, which is the portion of the axle that passes through and rotatably supports the rolling elements, has at least two outer diameters that are stepped along the direction of extension of the rotation shaft center; also has N (N=2, 3 ...) rolling element bores, where the inner circumference, which is the portion of the rolling element that is penetrated and supported by the axle, has at least two bores that are stepped along the direction of extension of the rotation axis center; the mechanism moves along the specific direction guided by the rail member with the rolling elements rolling and sliding between the outer and inner circumference surfaces in contact with the rail surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seismic isolation or vibration control mechanism that supports a supported object, and more particularly to a seismic isolation or vibration control mechanism that supports a supported object and isolates or controls movement in a specific direction. [Background technology]

[0002] Seismic isolation or damping mechanisms may be used to support a support structure or structures. For example, a device is used which includes a rolling element supported so as to be able to roll only around a predetermined axis on one side of either the supported object or the support, and a guide member attached to the other side of the supported object or the support, contacting the rolling element and extending in the rolling direction, and in which, when the supported object moves horizontally relative to the support, the distance between the rolling axis of the rolling element and a horizontal plane fixed to the guide member gradually increases as the rolling element rolls at least within a predetermined range from the smallest reference position. A wheel consists of an axle and rolling elements. The outer periphery of the axle passes through the inner periphery of the rolling elements, and the axle supports the rolling elements for free rotation about the rotation axis. In this way, as the wheel moves horizontally from the reference position, a restoring force is generated that returns the wheel to the reference position, and this acts as a spring element in a vibration system. When a friction member such as a bush is inserted between the rolling element and the axle, it acts as a damper element in the vibration system. When an earthquake or the like occurs and vibration acceleration acts on the support, the spring element and the damper element absorb and damp the vibration energy, thereby suppressing the acceleration acting on the supported object.

[0003] By selecting the characteristics of the spring and damper elements, desired vibration characteristics can be selected. There has been a demand for a seismic isolation or vibration control mechanism with better damping characteristics than the above-mentioned structures. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been devised in view of the above-mentioned problems, and aims to provide a seismic isolation or vibration control mechanism that can exert a seismic isolation or vibration control function with a simple configuration. [Means for solving the problem]

[0005] In order to achieve the above object, a seismic isolation or vibration control mechanism according to the present invention supports a supported object and isolates or controls movement in a specific direction, the mechanism comprising: a platform having a platform body and a rail member fixed to the platform body and forming a rail surface extending in a specific direction as viewed from above; a bogie body and a wheel axle supported by the bogie body, the wheel axle extending in a direction perpendicular to the specific direction as viewed from above; and a rolling body supported by the axle so as to be rotatable about the rotation axis, the rolling body having a circumferential rolling surface guided in contact with the rail surface and capable of rolling freely in the specific direction, wherein one of the platform or the bogie supports the supported object. The outer circumferential portion, which is the portion of the axle that penetrates the rolling element and supports it for free rotation, has at least two outer diameters, N (N = 2, 3,...), which are staggered along the direction of the rotation axis, and the inner circumferential portion, which is the portion of the rolling element that is penetrated by and supported by the axle, has at least two inner diameters, N (N = 2, 3,...), which are staggered along the direction of the rotation axis, and the rolling element rolls with the rolling surface in contact with the rail surface, and the outer circumferential portion and the inner circumferential portion slide against each other, and is guided by the rail member to move along the specific direction.

[0006] According to the above-mentioned configuration of the present invention, the pedestal has a pedestal body and a rail member fixed to the pedestal body and forming a rail surface extending in a specific direction as viewed from above. The bogie has a bogie body, an axle extending in a direction perpendicular to the specific direction as viewed from above and supported by the bogie body, and a rolling element supported by the axle for rotation around the rotation axis and guided with a circumferential rolling surface in contact with the rail surface, and capable of rolling freely in the specific direction. One of the pedestal or the bogie supports a supported body. The outer periphery of the axle, which is a portion that penetrates the rolling element and rotatably supports it, has at least two outer diameters, N (N=2, 3...) axle outer diameters that are stepped along the direction of the rotation axis. The inner periphery of the rolling element, which is a portion that penetrates and is supported by the axle, has at least two inner diameters, N (N=2, 3...) rolling inner diameters that are stepped along the direction of the rotation axis. The rolling element rolls with the rolling surface in contact with the rail surface, and the outer circumferential portion slides against the inner circumferential portion, and is guided by the rail member to move along the specific direction. As a result, the outer peripheral portion of the axle, which has N axle outer diameters, slides against the inner peripheral portion of the rolling elements, which has N rolling inner diameters, and as it moves along a specific direction, it acts as a damper element in a vibration system.

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention includes any one of the embodiments described below, or a combination of two or more of the embodiments described below.

[0008] In the seismic isolation or vibration control mechanism according to an embodiment of the present invention, a circumferentially extending groove is formed in the rolling body, dividing the rolling surface into N partial rolling surfaces along the axis of rotation at positions corresponding to the staggered positions of the N rolling body inner diameters of the inner circumference. With the configuration of the above embodiment, the rolling element is formed with a circumferentially extending groove that divides the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the staggered positions of the N rolling body inner diameters of the inner circumference. As a result, the rolling elements can easily elastically deform along the grooves, and the outer periphery of the sliding axle, which has N axle outer diameters, comes into contact with the inner periphery of the rolling elements, which has N rolling inner diameters, and as they move along a specific direction, they act as a damper element in a vibration system.

[0009] In an embodiment of the seismic isolation or vibration control mechanism of the present invention, the rolling body is formed with a circumferentially extending groove that divides the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the N staggered positions of the outer diameter of the axle on the outer periphery. With the configuration of the above embodiment, the rolling element is formed with a circumferentially extending groove that divides the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the N staggered positions of the axle outer diameter on the outer periphery. As a result, the rolling elements can easily elastically deform along the grooves, and the outer periphery of the sliding axle, which has N axle outer diameters, comes into contact with the inner periphery of the rolling elements, which has N rolling inner diameters, and as they move along a specific direction, they act as a damper element in a vibration system.

[0010] The seismic isolation or vibration control mechanism according to an embodiment of the present invention has N partial rolling elements, each of which forms N partial rolling surfaces that are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N rolling inner diameters of the inner circumference, and which can rotate freely relative to each other. With the configuration of the above embodiment, the N partial rolling bodies of the rolling body each form N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the stepped positions of the N rolling body inner diameters of the inner circumference, and can rotate freely relative to each other. As a result, the N partial rolling bodies become easily tilted, and the outer peripheral portion of the sliding axle, which has N axle outer diameters, comes into contact with the inner peripheral portion of the rolling body, which has N rolling inner diameters, and as they move along a specific direction, they act as a damper element in a vibration system.

[0011] The seismic isolation or vibration control mechanism according to an embodiment of the present invention has N partial rolling bodies that can rotate freely relative to each other, each of which forms N partial rolling surfaces, which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N outer diameters of the axles on the outer periphery. With the configuration of the above embodiment, the N partial rolling bodies of the rolling body each form N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N axle outer diameters of the outer periphery, and can rotate freely relative to each other. As a result, the N partial rolling bodies become easily tilted, and the outer peripheral portion of the sliding axle, which has N axle outer diameters, comes into contact with the inner peripheral portion of the rolling body, which has N rolling inner diameters, and as they move along a specific direction, they act as a damper element in a vibration system.

[0012] The seismic isolation or vibration control mechanism according to an embodiment of the present invention has N partial rolling bodies each having N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N inner diameters of the inner circumference of the rolling bodies and which can rotate freely relative to each other, and N-1 thrust washers fitted to the N partial rolling bodies. With the configuration of the above embodiment, The N partial rolling bodies of the rolling body each form N partial rolling surfaces that are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N inner diameters of the inner periphery, and can rotate freely relative to each other. The N-1 thrust washers of the rolling body are fitted into the N partial rolling bodies. As a result, the N partial rolling bodies become easily tilted, and the outer peripheral portion of the sliding axle, which has N axle outer diameters, comes into contact with the inner peripheral portion of the rolling body, which has N rolling inner diameters, and as they move along a specific direction, they act as a damper element in a vibration system.

[0013] The seismic isolation or vibration control mechanism of an embodiment of the present invention has N partial rolling bodies that each form N partial rolling surfaces, which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N axle outer diameters on the outer periphery, and can rotate freely relative to each other, and N-1 thrust washers that are fitted into the N partial rolling bodies. According to the configuration of the above embodiment, the N partial rolling bodies of the rolling body each form N partial rolling surfaces that are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the positions of the N axle outer diameter steps of the outer periphery, and can rotate freely relative to each other. The N-1 thrust washers of the rolling body are fitted into the N partial rolling bodies. As a result, the N partial rolling bodies become easily tilted, and as the outer periphery of the sliding axle, which has N axle outer diameters, comes into contact with the inner periphery of the rolling body, which has N rolling inner diameters, and moves along a specific direction, it realizes the function of a damper element in a vibration system.

[0014] In the seismic isolation or vibration control mechanism of an embodiment of the present invention, when viewed from above, within the stroke that the rolling body can move on the rail member, the position of the support point where the rail member contacts the rolling surface of the rolling body to support the rolling body changes along a direction perpendicular to the specific direction as it moves along the specific direction. With the configuration of the above embodiment, when viewed from above, within the stroke that the rolling body can move on the rail member, the position of the support point where the rail member contacts the rolling surface of the rolling body and supports the rolling body changes along a direction perpendicular to the specific direction as it moves along the specific direction. As a result, the function of a so-called damper element in a vibration system changes as it moves along a specific direction.

[0015] In the seismic isolation or vibration control mechanism of an embodiment of the present invention, when viewed from above, within a stroke during which the rolling body can move on the rail member, the position of the support point where the rail member contacts the rolling surface of the rolling body to support the rolling body changes between a position supporting one of the N partial rolling surfaces and a position supporting the other of the N partial rolling surfaces as the position moves along the specific direction. With the configuration of the above embodiment, when viewed from above, within the stroke that the rolling body can move on the rail member, the position of the support point where the rail member contacts the rolling surface of the rolling body to support the rolling body changes between a position supporting one of the N partial rolling surfaces and a position supporting the other of the N partial rolling surfaces as it moves along the specific direction. As a result, the function of a so-called damper element in a vibration system changes as it moves along a specific direction.

[0016] In the seismic isolation or vibration control mechanism according to an embodiment of the present invention, when viewed from above, within a stroke during which the rolling body can move on the rail member, the position of a support point at which the rail member contacts the rolling surface of the rolling body to support the rolling body changes between a position supporting one of the N partial rolling surfaces, a position supporting another of the N partial rolling surfaces, and a position supporting a plurality of the N partial rolling surfaces as the support point moves along the specific direction. With the configuration of the above embodiment, when viewed from above, within the stroke in which the rolling body can move on the rail member, the position of the support point where the rail member contacts the rolling surface of the rolling body to support the rolling body changes between a position supporting one of the N partial rolling surfaces, a position supporting another of the N partial rolling surfaces, and a position supporting a plurality of the partial rolling surfaces of the N partial rolling surfaces as the support point moves along the specific direction. As a result, the function of a so-called damper element in a vibration system changes as it moves along a specific direction.

[0017] In the seismic isolation or vibration control mechanism according to the embodiment of the present invention, when viewed from above, the rail member is fixed to the rack body, and the rail surface member is supported in contact with the base surface of the base member and forms the rail surface, and the rail surface member is replaceably attached to the base member. According to the configuration of the above embodiment, the rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member that is supported in contact with the base surface of the base member and forms the rail surface. The rail surface member is replaceably attached to the base member. As a result, it is possible to easily change the damping performance of a damper element whose damping function in a vibration system changes.

[0018] The seismic isolation or vibration control mechanism according to the embodiment of the present invention includes, as viewed from above, a base member to which the rail member is fixed to the rack body and which forms a base surface, and a rail surface member to which the rail surface is supported in contact with the base surface of the base member and which forms the rail surface, The base surface is flat, and when viewed along a horizontal axis perpendicular to a specific direction, the rail surface curves along a circular arc with the center of curvature on the side where the rolling elements are located. According to the configuration of the above embodiment, the rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member that is supported in contact with the base surface of the base member and forms the rail surface. The base surface is flat. When viewed along a horizontal axis perpendicular to a specific direction, the rail surface curves along an arc having a center of curvature on the side where the rolling elements are located. As a result, a so-called spring element of a vibration system can be realized.

[0019] In a seismic isolation or vibration control mechanism according to an embodiment of the present invention, when viewed from above, the rail member is fixed to the rack body and has a base member that forms a base surface, and a rail surface member that is supported in contact with the base surface of the base member and forms the rail surface, and when viewed along a horizontal axis perpendicular to a specific direction, the base surface is curved along an arc having a center of curvature on the side where the rolling elements that roll on the rail surface are located, and the rail surface member is a plate-like member having a certain thickness. According to the configuration of the above embodiment, the rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member that is supported in contact with the base surface of the base member and forms the rail surface. When viewed along a horizontal axis perpendicular to a specific direction, the base surface curves along an arc having a center of curvature on the side where the rolling elements that roll on the rail surface are located. The rail surface member is a plate-like member with a certain thickness. As a result, a so-called spring element of a vibration system can be realized.

[0020] When viewed from above, the seismic isolation or vibration control mechanism according to an embodiment of the present invention has a rolling element body in which the rolling element forms the rolling surface, and a friction member made of a friction material and fixed to the rolling element body to form the inner peripheral portion. According to the configuration of the above embodiment, the rolling element has a rolling element body which forms the rolling surface, and a friction member which is made of a friction material and fixed to the rolling element body to form the inner peripheral portion. As a result, the damping performance of the damping element of the vibration system is stabilized.

[0021] When viewed from above, the seismic isolation or vibration control mechanism of an embodiment of the present invention has an axle body in which the axle is supported by the bogie body, and a friction member made of friction material and fixed to the axle body to form the outer periphery. According to the configuration of the above embodiment, the axle has an axle body supported by the bogie body, and a friction member made of a friction material and fixed to the axle body to form the outer circumferential portion. As a result, the damping performance of the damping element of the vibration system is stabilized. Effect of the Invention

[0022] As described above, the seismic isolation or vibration control mechanism according to the present invention has the following effects due to its configuration. Either a base having a rail member or a bogie having rolling bodies supported by an axle supports a supported body, and the axle has N axle outer shapes on its outer periphery that are staggered along the direction in which the rotation axis extends, and the rolling bodies have N rolling inner diameters on its inner periphery that are staggered along the direction in which the rotation axis extends, and the rolling bodies roll with their rolling surfaces in contact with the rail surface, and the outer and inner portions slide against each other, guided by the rail member and moving along the specific direction, so that a damper element in a vibration system can be realized as the outer periphery of the axle with N axle outer shapes slides against the inner portion of the rolling bodies with N rolling inner diameters and moves along the specific direction. The rolling elements are formed with circumferentially extending grooves that divide the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the staggered positions of the N rolling inner diameters of the inner circumference, so that the rolling elements can easily elastically deform along the grooves, and as the outer periphery, which has N axle outer diameters, of the sliding axle comes into contact with the inner periphery, which has N rolling inner diameters of the rolling elements, and moves along a specific direction, a so-called damper element in a vibration system can be realized. The rolling elements are designed to have circumferentially extending grooves that divide the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the staggered positions of the N axle outer diameters on the outer periphery, so that the rolling elements can easily elastically deform along the grooves, and the outer periphery, having N axle outer diameters, of the sliding axle comes into contact with the inner periphery, having N rolling inner diameters of the rolling elements, and as they move along a specific direction, a damper element in a vibration system can be realized. The N partial rolling bodies of the rolling body are each formed with N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N rolling inner diameters of the inner circumference and are made to rotate freely relative to each other, so that the N partial rolling bodies can easily tilt, and the outer periphery having the N axle outer diameters of the sliding axle comes into contact with the inner periphery having the N rolling inner diameters of the rolling body, and as it moves along a specific direction, a so-called damper element in a vibration system can be realized. The N partial rolling elements of the rolling element are each formed with N partial rolling surfaces which are surfaces which divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N axle outer diameters on the outer periphery, and are allowed to rotate freely relative to each other. This makes it possible for the N partial rolling elements to tilt easily, and the outer periphery with the N axle outer diameters of the sliding axle comes into contact with the inner periphery with the N rolling inner diameters of the rolling element, thereby realizing a so-called damper element in a vibration system as it moves along a specific direction. The N partial rolling bodies of the rolling body each form N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N rolling inner diameters of the inner circumference, and can rotate freely relative to each other. The N-1 thrust washers of the rolling body are fitted into the N partial rolling bodies, so that the N partial rolling bodies can easily tilt, and the outer periphery having the N axle outer diameters of the sliding axle comes into contact with the inner periphery having the N rolling inner diameters of the rolling body, and as it moves along a specific direction, a damper element in a vibration system can be realized. The N partial rolling bodies of the rolling body each form N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the staggered positions of the N axle outer diameters of the outer periphery, and can rotate freely with respect to each other, and the N-1 thrust washers of the rolling body are fitted into the N partial rolling bodies, so that the N partial rolling bodies can easily tilt, and as the outer periphery with the N axle outer diameters of the sliding axle comes into contact with the inner periphery with the N rolling inner diameters of the rolling body and moves along a specific direction, a damper element in a vibration system can be realized. Within the stroke that the rolling body can move on the rail member, the position of the support point changes along a direction perpendicular to the specific direction as it moves along the specific direction, thereby realizing a damper element whose damping function in a vibration system changes as it moves along the specific direction. Within the stroke that the rolling body can move on the rail member, the position of the support point changes between a position supporting one of the N partial rolling surfaces and a position supporting the other of the N partial rolling surfaces as it moves along the specific direction, thereby realizing a damper element whose damping function in a vibration system changes as it moves along the specific direction. When viewed from above, within the stroke that the rolling body can move on the rail member, the position of the support point changes between a position supporting one of the N partial rolling surfaces, a position supporting another of the N partial rolling surfaces, and a position supporting a plurality of the N partial rolling surfaces as it moves along the specific direction, thereby realizing a damper element whose damping function in a vibration system changes as it moves along the specific direction. Since the rail member forming the rail surface is replaceably attached to the base member having a base surface, the damping performance of the damper element, which changes its damping function in the vibration system, can be easily changed. The rail member has a base member fixed to the frame body and forming a planar base surface, and a rail member supported in contact with the base surface and forming the rail surface. When viewed along a horizontal axis perpendicular to a specific direction, the rail surface curves along an arc with a center of curvature on the side where the rolling elements are located, thereby realizing a so-called spring element of a vibration system. The rail member is fixed to the frame body and comprises a base member which forms a base surface that curves along an arc with a center of curvature on the side where the rolling elements that roll on the rail surface are located, and a rail surface member which is supported in contact with the base surface and forms the rail surface.Since the rail member is a plate-like member with a constant thickness, a so-called spring element of a vibration system can be realized. Since the rolling element has a rolling element body which forms the rolling surface, and a friction member which is made of a friction material and is fixed to the rolling element body to form the inner peripheral portion, the damping performance of the so-called vibration system damper element is stabilized. Since the axle has an axle body supported by the bogie body and a friction member made of friction material and fixed to the axle body to form the outer periphery, the damping performance of the so-called vibration system damper element is stabilized. Therefore, it is possible to provide a seismic isolation or vibration control mechanism that can exert a seismic isolation or vibration control function with a simple configuration. [Brief description of the drawings]

[0023] [Figure 1] 1 is an overall view of a seismic isolation or vibration damping mechanism according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a partial view of a seismic isolation or vibration control mechanism according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a second partial view of the seismic isolation or vibration control mechanism according to an embodiment of the present invention. [Figure 4] FIG. 3 is a partial view of the seismic isolation or vibration control mechanism according to an embodiment of the present invention. [Diagram 5] FIG. 4 is a partial view of the seismic isolation or vibration control mechanism according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described. First, a seismic isolation or vibration control device according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an overall view of a seismic isolation or vibration damping mechanism according to an embodiment of the present invention. Fig. 2 is a partial view No. 1 of a seismic isolation or vibration damping mechanism according to an embodiment of the present invention. Fig. 3 is a partial view No. 2 of a seismic isolation or vibration damping mechanism according to an embodiment of the present invention. Fig. 4 is a partial view No. 3 of a seismic isolation or vibration damping mechanism according to an embodiment of the present invention. Fig. 5 is a partial view No. 4 of a seismic isolation or vibration damping mechanism according to an embodiment of the present invention.

[0025] The seismic isolation or vibration control device according to the embodiment of the present invention is a device that supports a supported body 50 and isolates or controls movement in a specific direction. The seismic isolation or vibration control device according to the embodiment of the present invention is composed of a base 100 and a cart 200. Either the platform 100 or the dolly 200 supports the supported object. FIG. 1 shows how a carriage 200 supports a supported object 50 .

[0026] The mount 100 is composed of a mount body 110 and a rail member 120 . The mount 100 may be composed of a mount body 110 and a plurality of rail members 120 . FIG. 1 shows a mount 100 that is composed of one mount body 110 and two rail members 120. As shown in FIG.

[0027] The bogie 200 is composed of a bogie body 210, an axle 220, and a rolling element 230. The bogie 200 may be composed of a bogie body 210 , a number of axles 220 , and a number of rolling elements 230 . One axle 220 supports one rolling element 230 so as to be rotatable about a rotation axis. FIG. 1 shows that a bogie 200 is composed of one bogie body 210, four axles 220, and four rolling elements 230.

[0028] The gantry body 110 is the main structure of the gantry 100 . The rail member 120 is a member that is fixed to the gantry body 110 and forms a rail surface S that extends in a specific direction X when viewed from above.

[0029] The carriage body 210 is the main structure of the carriage 200 . The axle 220 extends in a direction perpendicular to the specific direction X with a rotation axis Z when viewed from above, and is supported by the carriage body 210 . The rolling element 230 is supported by the axle 220 so as to be rotatable about a rotation axis Z, and has a circumferential rolling surface H which is guided in contact with the rail surface S so as to be capable of rolling freely in a specific direction X.

[0030] The outer periphery K of the axle 220 has at least two outer diameters N (N=2, 3, . . . ) axle outer diameters r1, r2, . . . that are staggered along the direction in which the rotation axis Z extends. Here, the outer circumferential portion K is a portion that penetrates the rolling element 230 and supports it rotatably. The inner periphery L of the rolling element 230 has at least two inner diameters q1, q2, . . . that are staggered along the direction in which the rotation axis Z extends. Here, the inner periphery L is the portion through which the axle 220 penetrates and is supported. An outer circumferential portion K of the axle 220 slidably supports an inner circumferential portion L of the rolling element 230 . The N rolling element inner diameters q1, q2, . . . of the outer periphery of the axle 220 respectively support the N rolling element inner diameters q1, q2, . The rolling element 230 rolls with its rolling surface H in contact with the rail surface S, and its outer circumferential portion K and its inner circumferential portion L slide against each other, and moves along the specific direction X while being guided by the rail member 120. 3(A), (B), and (C) show how the outer circumferential portion K of the axle 220 has axle outer diameters r1 and r2 that are two outer diameters that are staggered along the extension direction of the rotation axis Z, and how the inner circumferential portion L of the rolling element 230 has rolling inner diameters q1 and q2 that are two inner diameters that are staggered along the extension direction of the rotation axis Z. The two rolling inner diameters q1 and q2 on the outer circumferential portion of the axle 220 are shown to slidably support the two rolling inner diameters q1 and q2 on the inner circumferential portion L of the rolling element 230.

[0031] The rolling body 230 may be formed with a circumferentially extending groove M that divides the rolling surface H into N partial rolling surfaces along the rotation axis Z at positions corresponding to the stepped positions of the N rolling body inner diameters of the inner circumference L. For example, the rolling body 230 is formed with a circumferentially extending groove M that divides the rolling surface H into N partial rolling surfaces along the rotation axis Z at a position that approximately coincides with the staggered positions of the N rolling inner diameters of the inner circumference L along the rotation axis Z. FIG. 3(B) shows that the rolling body 230 has a circumferentially extending groove M formed at a position corresponding to the stepped positions of the N rolling body inner diameters q1, q2 of the inner circumference L of the rolling surface H, dividing the rolling body 230 into two partial rolling surfaces H1, H2 along the rotation axis Z.

[0032] The rolling body 230 may be formed with a circumferentially extending groove M that divides the rolling surface H into N partial rolling surfaces along the rotation axis Z at positions corresponding to the N stepped positions of the axle outer diameter on the outer periphery. For example, the rolling body 230 is formed with a circumferentially extending groove M that divides the rolling surface H into N partial rolling surfaces along the rotation axis Z at a position that approximately coincides with the rotation axis Z at the N staggered positions of the outer diameter of the axle on the outer periphery. FIG. 3(B) shows how the rolling body 230 is formed with a circumferentially extending groove M that divides the rolling surface H into two partial rolling surfaces H1, h2 along the rotation axis Z at a position corresponding to the staggered positions of the N axle outer diameters r1, r2 on the outer periphery.

[0033] The rolling body 230 may have N partial rolling bodies each having N partial rolling surfaces that are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the stepped positions of the N rolling body diameters of the inner circumference L, and that can rotate freely relative to each other. For example, the rolling body 230 has N partial rolling surfaces, which are surfaces that divide the rolling surface H along the rotation axis Z at positions that approximately coincide with the rotation axis Z at staggered positions of the N rolling body diameters of the inner circumference L, and has N partial rolling bodies that can rotate freely relative to each other. FIG. 3(C) shows that the rolling element 230 has two partial rolling surfaces H1, H2, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the two rolling inner diameters q1, q2 of the inner circumference L, and has two partial rolling elements 231, 232 that can rotate freely relative to each other.

[0034] The rolling body 230 may have N partial rolling bodies that can rotate freely relative to each other, each of which forms N partial rolling surfaces that are surfaces that divide the rolling body 230 along the rotation axis Z at positions on the rolling surface H corresponding to the N stepped positions of the axle outer diameter of the outer periphery K. For example, the rolling body 230 has N partial rolling surfaces, which are surfaces that divide the rolling body 230 along the rotation axis Z, at positions on the rolling surface H that approximately coincide with the staggered positions of the N axle outer diameters of the outer periphery K along the rotation axis Z, and has N partial rolling bodies that can rotate freely relative to each other. FIG. 3(C) shows that rolling body 230 has two partial rolling bodies 231, 232 that each form two partial rolling surfaces H1, h2, which are surfaces that divide rolling surface H along rotation axis Z at positions corresponding to the staggered positions of the two axle outer diameters r1, r2 of outer periphery K, and can rotate freely relative to each other.

[0035] The rolling body 230 may have N partial rolling surfaces, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the N rolling body diameters of the inner circumference L, each of which can rotate freely relative to one another, and N-1 thrust washers fitted to the N partial rolling bodies. Figure 3(C) shows that the rolling element 230 has two partial rolling surfaces H1, h2 that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the two rolling inner diameters q1, q2 of the inner circumference L, and has N partial rolling elements 231, 232 that can rotate freely relative to each other, and one thrust washer 231c that is fitted between the N partial rolling elements 231, 232.

[0036] The rolling body 230 may have N partial rolling surfaces, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the N staggered positions of the axle outer diameter of the outer periphery K, and may have N partial rolling bodies that can rotate freely relative to each other, and N-1 thrust washers that are fitted to the N partial rolling bodies. Figure 3(C) shows that the rolling body 230 has two partial rolling surfaces H1, H2 that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the two axle outer diameters r1, r2 of the outer periphery K, and has two partial rolling bodies 231, 232 that can rotate freely relative to each other, and one thrust washer 231c that is fitted between the two partial rolling bodies 231, 232.

[0037] When viewed from above, within the stroke that the rolling element 230 can move on the rail member 120, the position of the support point P changes along a direction perpendicular to the specific direction X as it moves along the specific direction X. The support point P is a point where the rail member 120 comes into contact with the rolling surface K of the rolling element 230 and supports the rolling element 230 . At points outside the support points P, the rail member 120 does not come into contact with the rolling surfaces K of the rolling elements 230.

[0038] When viewed from above, within the stroke that the rolling body 230 can move on the rail member 120, the position of the support point P may change between a position supporting one partial rolling surface of the N partial rolling surfaces and a position supporting the other partial rolling surface of the N partial rolling surfaces as it moves along a particular direction.

[0039] When viewed from above, within the stroke that the rolling body 230 can move on the rail member 120, the position of the support point P may change as it moves along the specific direction X between a position supporting one partial rolling surface of the N partial rolling surfaces, a position supporting another partial rolling surface of the N partial rolling surfaces, and a position supporting multiple partial rolling surfaces of the N partial rolling surfaces. FIG. 2 shows how the position of the support point P changes as it moves along a specific direction X between a position supporting one partial rolling surface of the two partial rolling surfaces H1, H2, a position supporting another partial rolling surface of the N partial rolling surfaces H1, H2, and a position supporting multiple partial rolling surfaces H1, H2 of the two partial rolling surfaces H1, H2.

[0040] The rail member 120 may be composed of a base member 121 and a rail surface member 122 . The base member 121 is a member that is fixed to the gantry body 110 and forms the base surface B. The rail surface member 122 is a member that forms a rail surface S by being supported in contact with the base surface B of the base member. The rail surface member 122 may be replaceably attached to the base member 121 . The rail surface member 122 may be attached to the base member 121 in a replaceable manner by bolting it on.

[0041] The base surface B may be flat, and the rail surface S may be curved along a circular arc having a center of curvature Q on the side of the rolling elements rolling on the rail surface when viewed along a horizontal axis perpendicular to a specific direction. FIG. 4(A) shows that the base surface B is flat and that, when viewed along a horizontal axis perpendicular to a specific direction, the rail surface S is curved along an arc having a center of curvature Q on the side of the rolling element 230 rolling on the rail surface S.

[0042] When viewed along a horizontal axis perpendicular to the specific direction X, the base surface B is curved along an arc having a center of curvature Q on the side of the rolling element 230 rolling on the rail surface S, and the rail surface member 122 may be a plate-like member having a constant thickness. FIG. 4(B) shows that, when viewed along a horizontal axis perpendicular to a specific direction X, the base surface B curves along an arc having a center of curvature Q on the side of the rolling element 230 rolling on the rail surface S, and the rail surface member 122 is a plate-like member having a constant thickness.

[0043] The rolling element 230 may be composed of a rolling element main body 230a and a friction member 230b. The rolling element main body 230a is a member that forms the rolling surface H. The friction member 230b is a member that is made of a friction material and is fixed to the rolling element main body 230a to form the inner periphery L. The rolling element 230 may be composed of a rolling element body 230a and a friction member 230b, and the axle 220 may be composed of an axle body 220a. In this case, the friction member 230b and the axle body 220a slide against each other, generating a frictional force.

[0044] The axle 220 may be comprised of an axle body 220a and a friction member 220b. The axle body 220a is a member supported by the bogie body 210. The friction member 220b is a member that is made of a friction material and is fixed to the axle body 220a to form the outer circumferential portion K. The rolling element 230 may be composed of a rolling element body 230a, and the axle 220 may be composed of an axle body 220a and a friction member 220b. In this case, the rolling element main body 230a and the friction member 220b slide against each other, generating a frictional force.

[0045] The rolling element 230 may be composed of a rolling element body 230a and a friction member 230b, and the axle 220 may be composed of an axle body 220a and a friction member 220b. In this case, the friction members 230b and 220b slide against each other, generating a frictional force.

[0046] As described above, the use of the seismic isolation or vibration control mechanism according to the embodiment of the present invention has the following effects. Either the base 100 having the rail member 120 or the carriage 200 having rolling elements supported by the axle 220 supports a supported object, and the axle 220 having N axle outer diameters that are staggered on its outer periphery along the direction of extension of the rotation axis Z rotatably supports, on its inner periphery, rolling elements 230 having N rolling inner diameters that are staggered on their outer periphery along the direction of extension of the rotation axis Z, and the rolling elements 230 roll with their rolling surface H in contact with the rail surface S, and the outer and inner peripheries slide against each other to move along the specific direction X while being guided by the rail member 120. Therefore, as the outer periphery of the axle 220 having N axle outer diameters slides against the inner periphery of the rolling elements 230 having N rolling inner diameters, and moves along the specific direction X, a so-called damper element in a vibration system can be realized. The rolling element 230 is formed with a circumferentially extending groove M that divides the rolling surface H into N partial rolling surfaces H along the rotation axis Z at positions corresponding to the staggered positions of the N rolling inner diameters on the inner circumference, so that the rolling element 230 can easily elastically deform along the groove M, and the outer circumference having N axle outer diameters of the sliding axle 220 comes into contact with the inner circumference having N rolling inner diameters of the rolling element 230, thereby realizing a so-called damper element in a vibration system as it moves along the specific direction X. The rolling element 230 is formed with a circumferentially extending groove M that divides the rolling surface H into N partial rolling surfaces H along the rotation axis Z at positions corresponding to the staggered positions of the N axle outer diameters on the outer periphery. This makes it easy for the rolling element 230 to elastically deform along the groove M, and the outer periphery having the N axle outer diameters of the sliding axle 220 comes into contact with the inner periphery having the N rolling inner diameters of the rolling element 230, thereby realizing a so-called damper element in a vibration system as it moves along the specific direction X. The N partial rolling bodies of the rolling body 230 are each formed with N partial rolling surfaces H, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the N rolling inner diameters of the inner circumference, and are made to be able to rotate freely relative to each other. As a result, the N partial rolling bodies can easily tilt, and the outer periphery of the sliding axle 220, which has N axle outer diameters, comes into contact with the inner periphery of the rolling body 230, which has N rolling inner diameters, and as it moves along the specific direction X, a so-called damper element in a vibration system can be realized. The N partial rolling bodies of rolling body 230 are each formed with N partial rolling surfaces H, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the N axle outer diameters on the outer periphery, and are made to be able to rotate freely relative to each other. As a result, the N partial rolling bodies can easily tilt, and the outer periphery having N axle outer diameters of sliding axle 220 comes into contact with the inner periphery having N rolling inner diameters of rolling body 230, and as it moves along the specific direction X, a so-called damper element in a vibration system can be realized. The N partial rolling bodies of the rolling body 230 each form N partial rolling surfaces H, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the N rolling inner diameters of the inner circumference, and can rotate freely relative to each other. Since the N-1 thrust washers of the rolling body 230 are fitted into the N partial rolling bodies, the N partial rolling bodies can easily tilt, and the outer periphery of the sliding axle 220, which has N axle outer diameters, comes into contact with the inner periphery of the rolling body 230, which has N rolling inner diameters, and as it moves along the specific direction X, a so-called damper element in a vibration system can be realized. The N partial rolling bodies of the rolling body 230 each form N partial rolling surfaces H, which are surfaces that divide the rolling surface H along the rotation axis Z at positions corresponding to the staggered positions of the N axle outer diameters on the outer periphery, and can rotate freely relative to each other. Since the N-1 thrust washers of the rolling body 230 are fitted into the N partial rolling bodies, the N partial rolling bodies can easily tilt, and as the outer periphery of the sliding axle 220 having the N axle outer diameters comes into contact with the inner periphery of the rolling body 230 having the N rolling inner diameters and moves along the specific direction X, a so-called damper element in a vibration system can be realized. Within the stroke that the rolling body 230 can move on the rail member 120, the position of the support point P is made to change along a direction perpendicular to the specific direction X as it moves along the specific direction X, thereby realizing a damper element whose damping function in a vibration system changes as it moves along the specific direction X. Within the stroke that the rolling body 230 can move on the rail member 120, the position of the support point P changes between a position supporting one partial rolling surface H1, H2... of the N partial rolling surfaces H and a position supporting the other partial rolling surface H of the N partial rolling surfaces H1, H2... as it moves along the specific direction X, so that a damper element whose damping function in a vibration system changes as it moves along the specific direction X can be realized. As viewed from above, within the stroke that the rolling body 230 can move on the rail member 120, the position of the support point P changes as it moves along the specific direction X between a position supporting one partial rolling surface H1, H2... of the N partial rolling surfaces H1, H2..., a position supporting another partial rolling surface H1, h2... of the N partial rolling surfaces H1, H2..., and a position supporting a plurality of partial rolling surfaces H1, H2... of the N partial rolling surfaces H1, H2..., so that a damper element whose damping function in a vibration system changes as it moves along the specific direction X can be realized. Since the rail member 120 forming the rail surface S is designed to be replaceably attached to the base member 121 having the base surface B by bolting on, the damping performance of the damper element, whose damping function in the so-called vibration system changes, can be easily changed. Rail member 120 has base member 121 fixed to frame body 110 and forming a flat base surface B, and rail member 120 abuts against and is supported by base surface B to form rail surface S. When viewed along a horizontal axis perpendicular to specific direction X, rail surface S is curved along an arc having a center of curvature Q on the side where rolling body 230 is located, so that a so-called spring element of a vibration system can be realized. Rail member 120 is fixed to frame body 110 and comprises base member 121 which forms base surface B curved along an arc having center of curvature Q on the side of rolling body 230 which rolls on rail surface S, and rail member 120 which is supported in contact with base surface B and forms rail surface S. Since rail member 120 is a plate-like member having a constant thickness, a so-called spring element of a vibration system can be realized. Since the rolling element 230 has the rolling element body 230a which forms the rolling surface H, and the friction body 230b which is made of a friction material and is fixed to the rolling element body 230a to form the inner periphery, the damping performance of the so-called vibration system damper element is stabilized. Since the axle 220 has an axle body 220a supported by the bogie body 210 and a friction member 220b made of a friction material and fixed to the axle body 220a to form the outer periphery, the damping performance of the so-called vibration system damper element is stabilized.

[0047] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the invention. [Explanation of symbols]

[0048] X Specific direction Z rotation axis S Rail surface H Rolling surface H1, H2 partial raceway K Outer periphery L inner circumference R radius of curvature P Support point M groove B Foundation surface Q center of curvature r1 First axle outer diameter r2 Second axle outer diameter q1 First rolling inner diameter q2 Second rolling element inner diameter 50 Supported object 100 Mount 110 Stand body 120 Rail parts 121 Foundation members 122 Rail surface member 200 Carts 210 Cart Body 220 Axle 220a axle body 220b Friction member 230 Rolling elements 230a Rolling body 230b Friction member 231 First partial rolling element 231a First part rolling element body 231b First friction member 232 Second partial rolling element 232a Second partial rolling element body 232b Second friction member 231c Thrust washer [Prior art documents] [Patent documents]

[0049] [Patent Document 1] Special table 2011-38628

Claims

1. A seismic isolation or vibration control mechanism that supports a support and isolates or controls movement in a specific direction, a rack having a rack body and a rail member fixed to the rack body and forming a rail surface extending in a specific direction as viewed from above; a bogie having a bogie body, an axle supported by the bogie body, the axle having a rotation axis extending in a direction perpendicular to a specific direction when viewed from above, and a rolling body supported by the axle so as to be rotatable about the rotation axis, the rolling body having a circumferential rolling surface guided in contact with the rail surface, and capable of rolling freely in the specific direction; Equipped with One of the frame or the dolly supports a support body, The outer periphery of the axle, which is a portion that penetrates the rolling elements of the axle and rotatably supports them, has at least two outer diameters, N (N=2, 3, . . . ), that are staggered along the direction of the rotation axis, The inner periphery of the rolling element, which is a portion that is penetrated and supported by the axle, has at least two inner diameters, N (N=2, 3, . . . ), that are staggered along the direction of the rotation axis, the rolling body rolls with the rolling surface in contact with the rail surface, the outer circumferential portion slides against the inner circumferential portion, and is guided by the rail member to move along the specific direction; A seismic isolation or vibration control mechanism comprising:

2. The rolling element is provided with a circumferentially extending groove dividing the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the stepped positions of the N rolling inner diameters of the inner periphery.

2. The seismic isolation or vibration control mechanism according to claim 1.

3. The rolling element is formed with a circumferentially extending groove dividing the rolling surface into N partial rolling surfaces along the rotation axis at positions corresponding to the N positions of the outer circumferential portion of the axle outer diameter that are staggered.

2. The seismic isolation or vibration control mechanism according to claim 1.

4. The rolling elements have N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the stepped positions of the N rolling inner diameters of the inner periphery, and the N partial rolling elements can rotate freely relative to each other.

2. The seismic isolation or vibration control mechanism according to claim 1.

5. The rolling elements each have N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the N positions of the outer periphery where the axle outer diameter is stepped, and N partial rolling elements which can rotate freely relative to each other are formed.

2. The seismic isolation or vibration control mechanism according to claim 1.

6. The rolling elements each have N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the stepped positions of the N inner diameters of the inner periphery, and the N partial rolling elements can rotate freely relative to each other, and N-1 thrust washers are fitted to the N partial rolling elements.

2. The seismic isolation or vibration control mechanism according to claim 1.

7. The rolling elements each have N partial rolling surfaces which are surfaces that divide the rolling surface along the rotation axis at positions corresponding to the N positions of the outer circumferential surface of the axle, and the N partial rolling elements can rotate freely relative to each other, and N-1 thrust washers are fitted to the N partial rolling elements.

2. The seismic isolation or vibration control mechanism according to claim 1.

8. When viewed from above, within a stroke during which the rolling element can move on the rail member, a position of a support point, which is a point where the rail member comes into contact with the rolling surface of the rolling element and supports the rolling element, changes along a direction perpendicular to the specific direction as the position moves along the specific direction.

8. A vibration isolation or damping mechanism according to claim 1.

9. When viewed from above, within a stroke during which the rolling body can move on the rail member, a position of a support point at which the rail member comes into contact with the rolling surface of the rolling body to support the rolling body changes along a direction perpendicular to the specific direction between a position supporting one of the N partial rolling surfaces and a position supporting the other of the N partial rolling surfaces as the support point moves along the specific direction.

8. A vibration isolation or damping mechanism according to claim 2.

10. as viewed from above, within a stroke that the rolling body can move on the rail member, a position of a support point where the rail member comes into contact with the rolling surface of the rolling body to support the rolling body changes among a position supporting one of the N partial rolling surfaces, a position supporting another of the N partial rolling surfaces, and a position supporting a plurality of the N partial rolling surfaces as the rolling body moves along the specific direction.

10. The vibration isolation or damping mechanism according to claim 9.

11. The rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member abutting against and supported on the base surface of the base member and forming the rail surface, The rail surface member is replaceably attached to the base member.

11. The vibration isolation or damping mechanism according to claim 10.

12. The rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member abutting against and supported on the base surface of the base member and forming the rail surface, The base surface is flat, When viewed along a horizontal axis perpendicular to a specific direction, the rail surface curves along a circular arc having a center of curvature on the side where the rolling elements rolling on the rail surface are located.

12. The vibration isolation or damping mechanism according to claim 11.

13. The rolling element has a rolling element body forming the rolling surface, and a friction member made of a friction material and fixed to the rolling element body to form the inner peripheral portion.

13. A vibration isolation or damping mechanism according to claim 12.

14. The axle has an axle body supported by the bogie body and a friction member made of a friction material and fixed to the axle body to form the outer circumferential portion.

14. The vibration isolation or damping mechanism according to claim 13.

15. The rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member abutting against and supported on the base surface of the base member and forming the rail surface, The base surface is flat, When viewed along a horizontal axis perpendicular to a specific direction, the rail surface curves along a circular arc having a center of curvature on the side where the rolling elements rolling on the rail surface are located.

2. The seismic isolation or vibration control mechanism according to claim 1.

16. The rolling element has a rolling element body forming the rolling surface, and a friction member made of a friction material and fixed to the rolling element body to form the inner peripheral portion.

2. The seismic isolation or vibration control mechanism according to claim 1.

17. The axle has an axle body supported by the bogie body and a friction member made of a friction material and fixed to the axle body to form the outer circumferential portion.

2. The seismic isolation or vibration control mechanism according to claim 1.

18. A seismic isolation or vibration control mechanism that supports a support and isolates or controls movement in a specific direction, a rack having a rack body and a rail member fixed to the rack body and forming a rail surface extending in a specific direction as viewed from above; a bogie having a bogie body, an axle supported by the bogie body, the axle having a rotation axis extending in a direction perpendicular to a specific direction when viewed from above, and a rolling body supported by the axle so as to be rotatable about the rotation axis, the rolling body having a circumferential rolling surface guided in contact with the rail surface, and capable of rolling freely in the specific direction; Equipped with One of the frame or the dolly supports a support body, When viewed from above, within a stroke during which the rolling element can move on the rail member, a position of a support point, which is a point where the rail member comes into contact with the rolling surface of the rolling element and supports the rolling element, changes along a direction perpendicular to the specific direction as the position moves along the specific direction. A seismic isolation or vibration control mechanism comprising:

19. The inner periphery of the rolling element, which is a portion that is penetrated and supported by the axle, has at least two inner diameters, N (N=2, 3, . . . ), that are staggered along the direction of the rotation axis, The rolling element divides the rolling surface into N partial rolling surfaces along a rotation axis at positions corresponding to the stepped positions of the N rolling inner diameters of the inner periphery, When viewed from above, within a stroke during which the rolling body can move on the rail member, a position of a support point at which the rail member comes into contact with the rolling surface of the rolling body to support the rolling body changes between a position supporting one of the N partial rolling surfaces and a position supporting the other of the N partial rolling surfaces as the support point moves along the specific direction.

20. The vibration isolation or damping mechanism according to claim 18.

20. The rolling elements each have N partial rolling surfaces which are surfaces dividing the rolling surface along the rotation axis, and N partial rolling elements which can rotate freely relative to each other, When viewed from above, within a stroke during which the rolling body can move on the rail member, a position of a support point at which the rail member comes into contact with the rolling surface of the rolling body to support the rolling body changes between a position supporting one of the N partial rolling surfaces and a position supporting the other of the N partial rolling surfaces as the support point moves along the specific direction.

20. The vibration isolation or damping mechanism according to claim 18.

21. The inner periphery of the rolling element, which is a portion that is penetrated and supported by the axle, has at least two inner diameters, N (N=2, 3, . . . ), that are staggered along the direction of the rotation axis, The rolling element divides the rolling surface into N partial rolling surfaces along a rotation axis at positions corresponding to the stepped positions of the N rolling inner diameters of the inner periphery, as viewed from above, within a stroke that the rolling body can move on the rail member, a position of a support point where the rail member comes into contact with the rolling surface of the rolling body to support the rolling body changes among a position supporting one of the N partial rolling surfaces, a position supporting another of the N partial rolling surfaces, and a position supporting a plurality of the N partial rolling surfaces as the rolling body moves along the specific direction.

20. The vibration isolation or damping mechanism according to claim 18.

22. The rolling elements each have N partial rolling surfaces which are surfaces dividing the rolling surface along the rotation axis, and N partial rolling elements which can rotate freely relative to each other, as viewed from above, within a stroke that the rolling body can move on the rail member, a position of a support point where the rail member comes into contact with the rolling surface of the rolling body to support the rolling body changes among a position supporting one of the N partial rolling surfaces, a position supporting another of the N partial rolling surfaces, and a position supporting a plurality of the N partial rolling surfaces as the rolling body moves along the specific direction.

20. The vibration isolation or damping mechanism according to claim 18.

23. The rail member has a base member fixed to the rack body and forming a base surface, and a rail surface member abutting against and supported on the base surface of the base member and forming the rail surface, The rail surface member is replaceably attached to the base member.

20. The vibration isolation or damping mechanism according to claim 18.

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