JP2010002025A - Vibration-proof roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-proof roller including inner and outer metal fittings, a vibration-proof elastic body and an outer peripheral elastic body, having a variable radial spring constant. <P>SOLUTION: In this vibration-proof roller 1, the inner metal fitting 2 holding a bearing on the inner peripheral side and the outer metal fitting 4 disposed on the outer peripheral side thereof are connected to each other through the vibration-proof elastic body 5 disposed between both metal fittings, and the outer peripheral elastic body 6 is provided on the outer peripheral surface of the outer metal fitting 4. Both elastic bodies 5, 6 are respectively provided with hollow parts 5a, 6a, both hollow parts are communicated with each other through communicating passages 10, 11, and compressive fluid such as air is enclosed in both hollow parts. A plurality of communicating passages are provided, some of the communicating passages 10 are provided with a one-way valve 12 for allowing the fluid to flow from the outer hollow part 6a toward the inner hollow part 5a, the other communicating passages 11 are provided with an opposite one-way valve 13, and both communicating passages are provided to be different in flow characteristics of the fluid from each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotating roller having a vibration isolating function, that is, a vibration isolating roller. The anti-vibration roller of the present invention is used as, for example, a step roller for an escalator, a guide roller for guiding an elevator to be raised, a wheel for various carts, or a power transmission wheel for general industrial equipment.

  Conventionally, as shown in FIG. 5, an anti-vibration elastic body in which an inner metal fitting 51 holding a bearing on the inner peripheral side and an outer metal fitting 52 arranged on the outer peripheral side of the inner metal fitting 51 are arranged between the two metal fittings 51, 52. An anti-vibration roller having a structure in which an outer peripheral elastic body 54 is provided on the outer peripheral surface of the outer metal fitting 52 while being connected through the outer metal fitting 53 is known (see Patent Document 1).

  The anti-vibration roller operates so as to suppress vibration by suppressing the load and impact (hereinafter simply referred to as load) received from the counterpart component by the anti-vibration elastic body 53, and suppresses vibration particularly at low load. Operates to withstand the load, especially when loaded.

  However, in the anti-vibration roller, since the anti-vibration elastic body 53 and the outer peripheral elastic body 54 are both solid types having a solid structure, the vibration absorbing action is not sufficient, and it is suitable for either low load or high load. There is an inconvenience that can only be handled.

JP-A-5-215127

  In view of the above points, the present invention provides an anti-vibration roller having an inner / outer metal fitting, an anti-vibration elastic body, and an outer peripheral elastic body with a variable radial spring constant, a wide range of correspondence, and excellent vibration absorption. An object of the present invention is to provide an anti-vibration roller that can be used.

  In order to achieve the above object, an anti-vibration roller according to claim 1 of the present invention has an inner metal fitting for holding a bearing on the inner peripheral side and an outer metal fitting arranged on the outer peripheral side of the inner metal fitting between the two metal fittings. In the anti-vibration roller that is connected via the anti-vibration elastic body and provided with the outer peripheral elastic body on the outer peripheral surface of the outer metal fitting, a hollow portion is provided in each of the elastic bodies, and both the hollow portions are connected via the communication path. Communicating with each other, and compressing fluid such as air is enclosed in the hollow portions.

  The anti-vibration roller according to claim 2 of the present invention is the anti-vibration roller according to claim 1, wherein a plurality of communication paths are provided, and some of the communication paths are anti-vibration from a hollow portion inside the outer peripheral elastic body. It has a one-way valve that allows the flow of fluid toward the hollow part inside the elastic body and blocks the flow in the opposite direction, and the other communication path is reversed from the hollow part inside the vibration-proof elastic body to the outer peripheral elastic body. It has a one-way valve that allows the flow of fluid toward the inner hollow part and blocks the flow in the opposite direction, and the both communication paths are set so that the flow characteristics of the fluid are different from each other. To do.

  In the vibration isolating roller of the present invention having the above-described configuration, the inner metal fitting, the vibration isolating elastic body, the outer metal fitting, and the outer peripheral elastic body are not only arranged in this order, but both the elastic bodies are provided with hollow portions, respectively. Are communicated with each other via a communication path, and a compressive fluid such as air is enclosed in both hollow portions. Therefore, in addition to the vibration absorbing action due to the deflection of both elastic bodies, the following actions are exhibited.

  In other words, the inner bracket is attached to a mounting part such as a shaft via a bearing, and the outer peripheral elastic body is relatively displaced in the direction in which the counterpart part approaches the mounting part with its outer peripheral surface in contact with the counterpart part. When a radial load is input to the roller, the outer peripheral elastic body is elastically deformed so as to be recessed, and accordingly, the volume of the hollow portion inside the outer peripheral elastic body (hereinafter also referred to as the outer hollow portion) is reduced and the pressure is reduced. Get higher. Accordingly, since a pressure difference is generated between the outer hollow portion and the hollow portion inside the vibration-proof elastic body (hereinafter also referred to as the inner hollow portion), the fluid in the outer hollow portion moves to the inner hollow portion via the communication path. . When the input of the load is lost, the volume of the outer hollow portion is restored, the pressure is lowered, and a pressure difference opposite to the above is generated, so that the fluid returns from the inner hollow portion to the outer hollow portion.

  Further, at the beginning of the load input, both elastic bodies are not yet compressed and fluid easily moves from the outer hollow portion to the inner hollow portion, so that the deflection amount of the vibration-proof elastic body changes greatly, and therefore FIG. As shown in part A of the graph, the radial spring constant due to the correlation between load and deflection is set small. Thereafter, when the fluid continues, the pressure in the inner hollow portion increases and the fluid becomes difficult to move, so that the radial spring constant increases as shown in part B of FIG. Therefore, the radial spring constant rises greatly from the A part to the B part, and thereby the radial spring constant is variable. As described above, the variation of the radial spring constant is such that the spring constant is low when the input load is small and the spring constant is high when the input load is large. Therefore, the vibration characteristics of the anti-vibration roller are such that the vibration is suppressed by the low spring and the load is resisted by the high spring.

  In addition to this, a plurality of communication passages are provided, and a one-way valve that allows a flow of fluid from the outer hollow portion to the inner hollow portion and blocks a flow in the opposite direction is provided in a part of the communication passages, A one-way valve that allows the flow of fluid from the inner hollow part to the outer hollow part and blocks the flow in the opposite direction is provided in the other communication path, and the flow characteristics of the fluid in both communication paths are set differently Then, the flow path is different between the “going stroke” in which the fluid moves from the outer hollow portion to the inner hollow portion and the “return stroke” in which the fluid moves from the inner hollow portion to the outer hollow portion. Since the flow characteristics are also different, the state of the radial spring constant is changed based on the difference in characteristics. For example, if the flow rate per unit time in the “going stroke” is set large and the flow rate in the “returning stroke” is set small, as shown in the graph of FIG. The operating characteristics can be changed with this, so that the absorption of vibrations can be increased.

  The present invention has the following effects.

  That is, according to the present invention, since the movement of the fluid is added to the operation in addition to the deflection of the elastic body, the radial spring constant of the anti-vibration roller can be made largely variable, and the vibration can be suppressed with a low spring. The product characteristics of the anti-vibration roller that can withstand the load with a spring can be fully exhibited. Further, according to the second aspect, since the characteristics change between the “going stroke” and the “returning stroke” of the fluid movement, the vibration absorbing operation can be further increased.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a cross section of a vibration isolating roller 1 according to an embodiment of the present invention cut along a plane perpendicular to the central axis 0. FIG. 2 is a half-cut sectional view of the roller 1 cut along a plane including the central axis 0, and shows an enlarged section taken along the line EE in FIG.

  In the roller 1 according to this embodiment, as shown in the drawing, an inner metal fitting 2 that holds a bearing 3 on the inner peripheral side and an outer metal fitting 4 arranged on the outer peripheral side of the inner metal fitting 2 are arranged between both metal fittings 2 and 4. The outer elastic body 6 is provided on the outer peripheral surface of the outer metal fitting 4, and the elastic bodies 5 and 6 are provided with hollow portions 5a and 6a, respectively. The parts 5a and 6a communicate with each other through the communication passages 10 and 11, and air (not shown) is sealed as a compressible fluid in the hollow parts 5a and 6a.

  The inner metal fitting 2 is an annular body, and a required number of bearings 3 are held between an inward flange portion 2a provided at an inner peripheral portion at one end and a retaining ring 7 attached to an inner peripheral portion at the other end.

  The outer metal fitting 4 is also an annular body, and is arranged coaxially on the outer peripheral side of the inner metal fitting 2. Further, a radial through hole 4a for inserting and fixing an insertion fitting 9 to be described later is provided at one place on the circumference of the outer fitting 4.

  The anti-vibration elastic body 5 is formed in a ring shape by urethane rubber, and is baked and fixed to the inner metal fitting 2 with its inner peripheral surface, and is baked and fixed to the outer metal fitting 4 with its outer peripheral surface. In addition, an inner hollow portion (also referred to as an inner air chamber) 5a is provided in the antivibration elastic body 5 over the entire circumference. Further, a normally closed injection valve (also referred to as an air valve) 8 for injecting air into the inside is provided at one axial end surface portion. Hereinafter, the anti-vibration elastic body 5 is also referred to as anti-vibration urethane because of its material.

  The outer peripheral elastic body 6 is also formed in an annular shape from urethane rubber, and is baked and fixed to the outer metal fitting 4 with an inwardly flanged end surface portion 6b provided at the inner peripheral portion at one end and the inner peripheral portion at the other end. In addition, an outer hollow portion (also referred to as an outer air chamber) 6a is provided in the outer circumference elastic body 6 over the entire circumference. The outer peripheral surface of the outer peripheral elastic body 6 is a roller rolling surface 6c in operation. Hereinafter, the outer peripheral elastic body 6 is also referred to as outer peripheral urethane from its material.

  An insertion fitting 9 is inserted and fixed in a radial through hole 4a provided in the outer fitting 4, and a plurality of communication passages 10, 11 for communicating the outer hollow portion 6a and the inner hollow portion 5a with the insertion fitting 9 are provided. Is provided.

  The insertion fitting 9 is provided with a protruding portion 9b having an outward flange shape on the outer peripheral portion of one end of the cylindrical body 9a, and is press-fitted into the through hole 4a from the outside in the radial direction of the outer fitting 4. The front end portion 9c of the metal fitting 9 penetrates the outer peripheral film of the anti-vibration urethane 5 and reaches the inner hollow portion 5a.

  Of the plurality of communication passages 10 and 11, the first communication passage 10 is constituted by an inner peripheral hole of the cylindrical body 9a, and the inner opening thereof is directed from the outer hollow portion 6a to the inner hollow portion 5a. A first one-way valve 12 is provided that allows all air flow and blocks the opposite flow. For example, a reed valve is used as the one-way valve 12.

  Of the plurality of communication passages 10 and 11, the second communication passage 11 is constituted by a small hole provided in the thickness of the cylindrical body 9a, and the inner hollow portion 5a is formed in the outer opening thereof. There is provided a second one-way valve 13 that allows air to flow toward the outer hollow portion 6a and blocks the flow in the opposite direction. A plurality of second communication passages 11 are provided. In the drawing, two locations are provided at symmetrical positions on the circumference of the cylindrical body 9a, and a second one-way valve 13 is provided for each. For example, a reed valve is used as the one-way valve 13.

  The first communication path 10 and the second communication path 11 are set so that the flow characteristics are different from each other. Specifically, the first communication path 10 is more unit than the second communication path 11. The air flow rate per hour is set large.

  In the anti-vibration roller 1 having the above configuration, the inner metal fitting 2, the anti-vibration urethane 5, the outer metal fitting 4, and the outer urethane 6 are arranged in this order from the inner circumference side to the outer circumference side. Are provided with hollow portions 5a and 6a, respectively, and the hollow portions 5a and 6a communicate with each other through the communication passages 10 and 11, and air is sealed in the hollow portions 5a and 6a. Therefore, in addition to the vibration absorbing action due to the deflection of both urethanes 5 and 6, the following actions are exhibited.

  That is, the inner metal fitting 2 is attached to a shaft (not shown) via the bearing 3 and the outer peripheral urethane 6 is in contact with the counterpart component 21 at one place on the circumference with the rolling surface 6c of the outer peripheral surface. When the counterpart component 21 is relatively displaced in the direction approaching the shaft and a radial load is input to the roller 1, the outer peripheral urethane 6 is elastic so as to be recessed radially inward at one load input portion on the circumference. In response to this, the volume of the outer hollow portion 6a is reduced and the pressure is increased. Accordingly, since a pressure difference is generated between the outer hollow portion 6a and the inner hollow portion 5a, the air in the outer hollow portion 6a moves to the inner hollow portion 5a via the first communication passage 10. When the input of the load is lost, the volume of the outer hollow portion 6a is restored, the pressure is lowered, and a pressure difference opposite to the above is generated, so that the second communication passage 11 is formed from the inner hollow portion 5a. The air returns to the outer hollow portion 6a via.

  At the beginning of load input, both the urethanes 5 and 6 are not compressed so much, and air easily moves from the outer hollow part 6a to the inner hollow part 5a. As shown in part A of FIG. 3, the radial spring constant due to the correlation between load and deflection is set small. Thereafter, if the air continues, the pressure in the inner hollow portion 5a increases and the air becomes difficult to move, so that the radial spring constant gradually increases as shown in part B of FIG. Therefore, the radial spring constant rises greatly from the A part to the B part, and thus the radial spring constant is variable. As described above, the spring constant is variable when the input load is small and the spring constant is low, and when the input load is large, the spring constant is high. Therefore, it is consistent with the product characteristics of the anti-vibration roller 1 such that the low spring softly suppresses vibration and the high spring is hard and can withstand the load.

  In addition to this, first and second communication passages 10 and 11 are provided in parallel as communication passages, and air flows from the outer hollow portion 6a to the inner hollow portion 5a in the first communication passage 10. A first one-way valve 12 is provided, and a second one-way valve 13 is provided in the second communication passage 11 to allow air flow from the inner hollow portion 5a toward the outer hollow portion 6a. The air flow characteristics in both communication passages 10 and 11 are set to be different from each other. Specifically, the first communication passage 10 is set to have a larger air flow rate per unit time than the second communication passage 11. ing. Therefore, the flow path is different between the “going stroke” in which the air moves from the outer hollow portion 6a to the inner hollow portion 5a and the “return stroke” in which the air moves from the inner hollow portion 5a to the outer hollow portion 6a. Since the flow characteristics are also different, the state of the radial spring constant is changed based on the difference in characteristics. Specifically, as shown in FIG. Can be changed. Therefore, it is possible to further increase the vibration absorption performance.

  The operating characteristics of the roller 1 include the elasticity of the urethanes 5 and 6, the volume of the hollow portions 5 a and 6 a, the air pressure to be sealed, the flow rate of the communication passages 10 and 11, the throttle amount of the one-way valves 12 and 13, etc. It is possible to adjust by. The type of the elastic body is not necessarily limited to urethane, and may be other elastomers.

The longitudinal cross-sectional view of the vibration isolator which concerns on the Example of this invention Cross-sectional view of the anti-vibration roller Graph showing the characteristics of the anti-vibration roller Graph showing the characteristics of the anti-vibration roller Half-cut cross-sectional view of a conventional anti-vibration roller

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration roller 2 Inner metal fittings 2a Flange part 3 Bearing 4 Outer metal fittings 4a Through-hole 5 Anti-vibration elastic body (anti-vibration urethane)
5a Inner hollow part 6 Outer elastic body (outer peripheral urethane)
6a Outer hollow portion 6b End surface portion 6c Rolling surface 7 Retaining ring 8 Injection valve 9 Insertion fitting 9a Cylindrical body 9b Projection portion 9c Tip portion 10 Communication path (first communication path)
11 Communication path (second communication path)
12 One-way valve (first one-way valve)
13 One-way valve (second one-way valve)
21 Mating part 0 Center axis

Claims (2)

An inner metal fitting that holds the bearing on the inner circumference side and an outer metal fitting arranged on the outer circumference side of the inner metal fitting are connected via an anti-vibration elastic body arranged between the two metal fittings, and an outer circumference is provided on the outer circumferential surface of the outer metal fitting. In the vibration proof roller provided with an elastic body,
The anti-vibration roller according to the present invention, wherein both elastic bodies are provided with hollow portions, the hollow portions are communicated with each other via a communication path, and a compressive fluid such as air is sealed in the hollow portions. The anti-vibration roller according to claim 1,
A plurality of communication passages are provided, and some communication passages are one-way valves that allow fluid flow from the hollow portion inside the outer peripheral elastic body to the hollow portion inside the vibration-proof elastic body and block the flow in the opposite direction. On the other hand, the other communication path has a one-way valve that allows the flow of fluid from the hollow portion inside the vibration-proof elastic body to the hollow portion inside the outer peripheral elastic body and blocks the flow in the opposite direction. The anti-vibration roller is characterized in that the two communication passages are set so that the fluid flow characteristics are different from each other.

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