JP2003172390A - Annular composite - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular composite capable of preventing generation of play by permanent deformation even when it is left for a long time in a condition that load due to loading is applied, capable of being produced at a low cost, and capable of being used as a vibration-isolating roller or a vibration-isolating bush. <P>SOLUTION: A first annular body 10 formed by a polymer material exhibiting high rigidity has a structure wherein a boss part 11 on an inner peripheral side is connected to an outer ring part 12 on an outer peripheral side through a plurality of flexible spoke shaped connection parts 13 and 14. A second annular body 20 formed by a foamed polymer material exhibiting lower rigidity intervenes between the boss part 11 and the outer ring part 12. The first annular body 10 hardly receives deformation, and the second annular body 20 formed by the foamed polymer material and exhibiting low rigidity rapidly restores even when receiving large deformation. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration roller that has a vibration-proof structure and rotates while receiving a load, such as a guide roller of a conveyance machine or a paper feed roller of OA equipment. The present invention relates to an annular composite body that can be used as a supporting anti-vibration bush or the like.

[0002]

2. Description of the Related Art A roller having a composite structure using a rubber-like elastic material is used for a roller of a conveyor machine such as a conveyor in order to obtain a vibration-proof property and a cushioning property. FIG. 4 and FIG. 5 are cross-sectional views showing a conventional annular composite body cut along a plane passing through an axis O thereof.

First, the annular composite 100 shown in FIG.
The outer elastic layer 102 made of a rubber-like elastic material having low rigidity, that is, a soft elastic material is annularly molded and integrated with the outer periphery of the metal boss portion 101 rotatably mounted on the outer periphery of the support shaft via a bearing. Have a structure. That is, the outer elastic layer 102 in contact with the mating member is made of a rubber-like elastic material having a low rigidity, so that the outer elastic layer 102 exerts a good absorbing action against vibration and impact load input from the mating member during rotation.

However, according to the ring-shaped composite body 100 having this structure, under the condition that the deformation force due to the load is constantly applied even when the equipment is stopped, that is, even when the ring-shaped composite body 100 is stopped, the outer elasticity is generated when it is stopped for a long time. In the layer 102, a permanent strain due to a load is generated at a position where it is pressed against the mating material. For this reason,
There is a problem that the circularity of the outer peripheral surface of the outer elastic layer 102 is impaired, and when the device is started after being stopped for a long time, the annular composite body 100 itself as a vibration-proof roller causes vibration due to rattling. It was

The ring-shaped composite body 110 shown in FIG. 5 is an improvement of this kind of point, and has a low rigidity between the metal boss portion 111 and the metal inner sleeve 112 arranged on the outer periphery thereof. Inner elastic layer 113 made of rubber-like elastic material
Are integrally molded in an annular shape, and are fitted to the outer circumference of the inner sleeve 112 with an appropriate interference, and the outer sleeve 114 is made of metal.
The outer elastic layer 115 made of a high-rigidity rubber material is integrally molded in an annular shape on the outer periphery of the. That is, since the outer elastic layer 115 that contacts the mating member is made of a highly rigid rubber-like elastic material, the annular composite body 11 is under load.
Even if the rotation of 0 is stopped for a long time, permanent strain is unlikely to occur, and vibration during rotation is absorbed by the inner elastic layer 113 made of a rubber-like elastic material having low rigidity.

However, the ring-shaped composite body 11 having such a structure is used.
0 has a large number of parts, and in manufacturing, a step of molding the inner elastic layer 113 between the boss portion 111 and the inner sleeve 112 to obtain a molded body 116 on the inner peripheral side, and an outer peripheral surface of the outer sleeve 114. Since the step of molding the elastic layer 115 to obtain the molded body 117 on the outer peripheral side and the step of fitting and molding the molded bodies 116 and 117 together are required, the number of steps is large and the manufacturing cost is high.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its technical problem is that it has excellent vibration damping properties and long-lasting in a state where a load is applied. Even if left for a long time, it is difficult to cause rattling due to permanent distortion,
Another object of the present invention is to provide a cyclic composite that can be manufactured at low cost.

[0008]

The conventional technical problems can be effectively solved by the present invention. That is, the annular composite body according to the invention of claim 1 comprises a first annular body formed of a polymer material having a relatively high rigidity and a second annular body formed of a polymer material having a relatively low rigidity. A structure in which the first annular body is formed by connecting a boss portion on the inner peripheral side and an outer ring portion on the outer peripheral side, which are concentrically arranged, through a plurality of connecting portions having appropriate flexibility. And the second annular body is interposed between the boss portion and the outer ring portion.

Further, the annular composite according to the invention of claim 2 is characterized in that, in the constitution described in claim 1, the polymer material having relatively low rigidity is a foamed polymer material. Is.

According to a third aspect of the present invention, in the annular composite body according to the first or second aspect, the connecting portion of the first annular body is formed in a spoke shape, and the connecting portion of the boss portion and the outer ring portion is formed. It connects the both ends in the axial direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a preferred first embodiment of a ring-shaped composite body according to the present invention, in which (A) is a view seen from a direction parallel to the axis O, (B). ) Is B in (A)
It is sectional drawing cut | disconnected and shown by the line -OB '. That is, the ring-shaped composite body 1 of the present embodiment includes the first ring-shaped body 10 and the second ring-shaped body 20.

In the first annular body 10, an inner peripheral boss portion 11 and an outer peripheral outer ring portion 12 which are arranged concentrically with each other have a plurality of connecting portions 13 and 14 between their axial ends. It has a continuous structure via the whole, and is entirely molded of a solid type polymer material, that is, typically polyurethane rubber, nitrile rubber, or the like. This polymer material has a relatively high rigidity and has a characteristic that permanent strain is unlikely to occur, that is, it is easily recovered even when strain is applied.

Connection parts 13, 1 in the first annular body 10
Numeral 4 is formed in the shape of an elongated rod and therefore has appropriate flexibility. One of the connecting portions 13 is
Along the one axial end surface 20a of the second annular body 20, the second annular body 20 extends in the radial direction at equal phase intervals (intervals of 45 ° in the circumferential direction in the illustrated example), and the other connecting portion 14 has the second annular shape. Body 20
Along the other end surface 20b in the axial direction, the radial directions are extended at the same phase interval as that of the connecting portion 13, that is, the spokes are formed in the shape of a spoke extending radially about the axis O of the annular composite body. Further, the one connecting portion 13 is on an intermediate phase between the other connecting portions 14 and 14, and therefore the other connecting portion 14 is also on an intermediate phase between the one connecting portions 13 and 13, that is, the connecting portions. The parts 13 and 14 are the second annular body 2
Are present alternately on both sides in the circumferential direction.

The second annular body 20 is formed of a foamed polymer material, typically urethane foam, polyurethane foam, or foamed nitrile rubber, and the boss portion 11 of the first annular body 10 is formed. And the outer ring portion 12 are interposed in a filled state. That is, the second annular body 20 is
Since there are an extremely large number of voids due to air bubbles inside, the rigidity is relatively lower than that of the first annular body 10. Therefore, it is flexibly deformed by vibration or impact load inputted from the outside, and has a buffering action or a vibration absorbing action. In addition, the presence of an extremely large number of voids due to air bubbles has the characteristic that the recovery after deformation is fast.

The first annular body 10 and the second annular body 2
0 is integrated into the shape shown in the drawing in the molding process, but the foamed urethane and the like forming the second annular body 20 has adhesiveness itself, so that it is formed during molding. It is not necessary to bond the first annular body 10 with an adhesive. Further, each of the plurality of connecting portions 1 in the first annular body 10
3, 14 also exert an action of pressing the second annular body 20 from both sides in the axial direction to prevent the second annular body 20 from being displaced or dropped from the first annular body 10.

The annular composite body 1 having the above-mentioned structure is
For example, it is used as an anti-vibration roller for a transport machine or the like, and is not shown via a bearing such as a ball bearing fitted into the inner peripheral hole 11a of the boss portion 11 of the first annular body 10. It is rotatably mounted on the outer periphery of the support shaft, and when the device is driven, the outer peripheral surface 12a of the outer ring portion 12 of the first annular body 10 is rotated while being in contact with the moving counterpart material. Then, when vibration or shock is input from the mating material due to the rotation, the outer ring portion 1
2 is displaced while the connecting portions 13 and 14 and the second annular body 20 are deformed, and effectively absorbs transmission vibration and impact load.

At this time, since the connecting portions 13 and 14 are slower in recovering from deformation than the second annular body 20 made of a foamed polymer material, the action of suppressing the deformation recovering operation of the second annular body 20 is suppressed. Have. And thereby, good vibration damping performance can be exhibited.

In addition, even when the equipment is stopped, if the deformation load due to the load is continuously input from the mating material with which the outer peripheral surface 12a of the outer ring portion 12 is in contact,
Since the amount of deformation of the outer ring portion 12 due to this is small, the second annular body 20 is mainly eccentric to the first annular body 1.
Although it is in a state of being deformed in one direction between the boss portion 11 of 0 and the outer ring portion 12, since the second annular body 20 has an extremely large number of voids due to bubbles inside thereof, Even if it undergoes a large deformation, it is quickly restored after unloading, and permanent set is unlikely to occur. Moreover, since the outer ring portion 12 of the first ring-shaped body 10 made of a solid type polymer material also has a small amount of deformation, permanent strain is unlikely to occur and roundness is less likely to be impaired. As a result, rattling and vibration are less likely to occur even when the engine is started after being stopped for a long time.

Therefore, the annular composite body 1 of the present embodiment can be preferably applied to a vibration-proof roller or the like that rotates while receiving a load due to a load and that the load acts even during a stop, and has excellent cushioning property and It is a vibration proof. Moreover,
Since the parts are only the first annular body 10 and the second annular body 20 and the bonding step, the press-fitting step, etc. are not necessary, the parts can be manufactured at low cost.

The characteristics of the ring-shaped composite 1 such as vibration absorption, damping, deformation recovery, load bearing capacity, etc. are determined by the number, thickness and shape of the connecting portions 13 and 14 in the first ring-shaped body 10, By changing the cell density of the foamed polymer material forming the second annular body 20, it can be appropriately set according to the usage conditions and the like. 2 and 3 show the connecting portion 13,
14 shows another embodiment in which 14 has a shape different from that shown in FIG.

Of these, FIG. 2 shows a second embodiment of the ring-shaped composite body according to the present invention, which is BO-O- in FIG. 1 (A).
FIG. 2 is a cross-sectional view cut at a position corresponding to the line B ′, and the annular composite body 2 according to this embodiment has a shape in which the connecting portions 13 and 14 of the first annular body 10 meander in a wavy manner and extend. , Is embedded in the vicinity of both axial ends of the second annular body 20. The configuration of the other parts is the same as that of the annular composite body 1 shown in FIG. 1 described above.

That is, according to the annular composite body 2 shown in FIG. 2, since the connecting portions 13 and 14 are formed in a wavy shape, the deformability when a load is applied is further improved, and the connecting portions 13 and 14 are twisted in the torsional direction. The degree of freedom of is also increased.

FIG. 3 shows a third embodiment of the cyclic composite according to the present invention, which is B--O--B 'in FIG. 1 (A).
It is sectional drawing cut and shown in the position corresponding to a line. In the annular composite body 3 according to this mode, the connecting portions 13 and 14 of the first annular body 10 extend in the directions opposite to each other so that the projected shapes in the circumferential direction are X-shaped intersecting shapes. It has a shape and is embedded in the second annular body 20. In other words, one connecting portion 13 that extends obliquely between the outer peripheral portion 11b on one end of the boss portion 11 and the inner peripheral portion 12b on the other end of the outer ring portion 12, the outer peripheral portion 11c on the other end of the boss portion 11, and the outer ring portion. One of the connecting portions 14 that extends obliquely between the inner peripheral portion 12c at one end of 12 is formed alternately in the circumferential direction at equal phase intervals. The configuration of the other parts is the same as that of the annular composite body 1 shown in FIG. 1 described above.

That is, according to the annular composite body 3 shown in FIG. 3, the connecting portions 13 and 14 form a projected shape in the circumferential direction intersecting with each other in an X shape, and connect the boss portion 11 and the outer ring portion 12. Therefore, the supporting force of the connecting portions 13 and 14 against the load is increased.

In the above-mentioned embodiments, the annular composite body of the present invention has been described as being used as a vibration isolating roller of a conveyor machine, but it is always subjected to a load,
Other annular bodies for vibration isolation, such as vibration isolation bushes, casters for transportation, etc., where a load acts even while stopped,
It can be applied suitably.

[0026]

According to the ring-shaped composite body of the first aspect of the present invention, the ring-shaped composite body includes only the first ring-shaped body and the second ring-shaped body.
Since the number of parts is small and the number of manufacturing processes is also small, it can be provided at low cost. Further, since the outer ring portion of the first ring-shaped body formed of a high-rigidity polymer material comes into contact with the mating member, permanent strain is unlikely to occur even under use conditions in which it is continuously deformed by a load in a stopped state. It is possible to effectively prevent rattling and vibration when starting after a stop of time, and to prevent external impact load and vibration from being generated by the second low-rigidity polymeric material. The annular body and the connecting portion connecting the boss portion and the outer ring portion of the first annular body to each other can be absorbed and attenuated by the repeated deformation operation.

According to the second aspect of the present invention, since the low-rigidity polymeric material forming the second annular body is a foamed polymeric material, it is not deformed by a load in a stopped state. Even under the conditions of continuous use, since a large number of bubbles are present inside, permanent distortion is unlikely to occur, and since the foamed polymer material itself has adhesiveness, use an adhesive during molding. Since it is not necessary to bond the first annular body, it can be provided at a lower cost.

According to the annular composite body of the third aspect of the present invention, the connecting portion of the first annular body is formed in a spoke shape and connects the axial ends of the boss portion and the outer annular portion. The characteristics of the cyclic composite can be appropriately set according to the usage conditions by the number, thickness, and connection form.

[Brief description of drawings]

FIG. 1 shows a preferred first embodiment of a ring-shaped composite according to the present invention, (A) is a view seen from a direction parallel to the axis, and (B) is B- in (A). It is sectional drawing cut | disconnected and shown by the OB 'line.

FIG. 2 is a sectional view showing a second embodiment of a ring-shaped composite body according to the present invention by cutting it at a position corresponding to a line B-O-B 'in FIG. 1 (A).

FIG. 3 is a cross-sectional view showing a third embodiment of a ring-shaped composite body according to the present invention by cutting it at a position corresponding to the line B-O-B 'in FIG. 1 (A).

FIG. 4 is a cross-sectional view showing an annular composite body according to a conventional technique, taken along a plane passing through an axis O thereof.

FIG. 5 is a cross-sectional view showing another example of the annular composite body according to the conventional technique, taken along a plane passing through the axis O thereof.

[Explanation of symbols]

1,2,3 cyclic complex 10 First annular body 11 Boss 12 Outer ring 13,14 Connection part 20 Second annular body

Continued front page    F-term (reference) 3F033 GA08 GC04 GC05 GC06 GD04                       GE04                 3J059 BC04 BC11 BD07 BD08 CB01                       GA50

Claims (3)

[Claims] 1. A first annular body (10) formed of a polymer material having a relatively high rigidity and a second annular body (20) formed of a polymer material having a relatively low rigidity. In the first annular body (10), the inner peripheral boss portion (11) and the outer peripheral outer ring portion (12) arranged concentrically with each other are connected to each other with appropriate flexibility. The second annular body (20) has a structure continuous through the portions (13, 14), and is interposed between the boss portion (11) and the outer ring portion (12). And a circular complex. 2. The annular composite according to claim 1, wherein the polymer material having a relatively low rigidity is a foamed polymer material. 3. The connecting portions (13, 14) of the first annular body (10) are formed in a spoke shape and have a boss portion (1).
The annular composite according to claim 1 or 2, wherein the axially opposite ends of the outer ring part (12) are connected to each other.