JP2020097965A - Dynamic vibration absorber - Google Patents

Abstract

To provide a dynamic vibration absorber capable of suppressing resonance of not only vibration in a rotating direction of a rotating shaft but also vibration in an inclination direction of the rotating shaft to a center axis of the rotating shaft, while suppressing occurrence of imbalance.SOLUTION: An outer peripheral face side of a slide bearing 120 is provided with an annular projecting portion 121 of which a cross-sectional shape obtained by cutting a slide bearing 120 at a face including a center axis of the slide bearing 120 is a circular arc shape projecting to a radial outer side, an inner peripheral face side of a vibration ring 130 is provided with an annular recessed portion 132a of which a cross-sectional shape obtained by cutting a vibration ring 130 at a face including a center axis of the vibration ring 130 is a circular arc shape recessed to a radial outer side, and the outer peripheral face of the annular projecting portion 121 and the inner peripheral face of the annular recessed portion 132a are slidably kept into contact with each other.SELECTED DRAWING: Figure 3

Description

The present invention relates to a dynamic vibration reducer that suppresses resonance phenomena in a rotating shaft in a plurality of directions.

For example, a propeller shaft (rotary shaft) provided in a vehicle body of an automobile is generally provided with a dynamic vibration reducer (dynamic damper) in order to suppress a resonance phenomenon at a specific frequency. A conventional dynamic vibration reducer will be described with reference to FIG. FIG. 9 is a schematic cross-sectional view of a dynamic vibration reducer according to a conventional example.

A dynamic vibration reducer 500 according to a conventional example connects a hub 510 attached to a propeller shaft, a vibration ring 530 provided concentrically with the hub 510 on the outer peripheral surface side of the hub 510, and the hub 510 and the vibration ring 530. It is provided with a pair of elastic body units 540. Further, the dynamic vibration reducer 500 includes an annular slide bearing 520 provided at a position between the pair of elastic body units 540 and a position between the outer peripheral surface of the hub 510 and the inner peripheral surface of the vibration ring 530. ..

The vibrating ring 530 integrally includes a cylindrical portion 531 and an annular convex portion 532 that extends radially inward from the center of the cylindrical portion 531. Elastic body units 540 are provided on both sides of the annular convex portion 532. The elastic unit 540 includes a first cylindrical member 541 fitted and fixed to the outer peripheral surface of the hub 510, and a second cylindrical member 542 fitted and fixed to the inner peripheral surface of the cylindrical portion 531 of the vibration ring 530. , And an elastic body portion 543 made of an elastic body such as rubber that is fixed to each of these. The slide bearing 520 is fitted and fixed to the outer peripheral surface of the hub 510 and is slidably provided on the inner peripheral surface of the annular convex portion 532 of the vibrating ring 530 or the annular convex portion of the vibrating ring 530. It is fitted and fixed to the inner peripheral surface of the portion 532 and slidably provided on the outer peripheral surface of the hub 510.

In the dynamic vibration reducer 500 configured as described above, when vibration of a frequency at which the propeller shaft resonates is transmitted, the vibration ring 530 vibrates, thereby exhibiting a function of suppressing resonance of the propeller shaft. In the dynamic vibration reducer 500 according to this conventional example, the vibration ring 530 is designed to suppress resonance of the propeller shaft with respect to vibration in the rotation direction (twisting direction) of the propeller shaft.

However, as the vehicle speed increases and the number of revolutions of the propeller shaft increases, the centrifugal force acting on the vibration ring 530 increases, and the vibration ring 530 may move away from the central axis of the hub 510. Such a behavior is generally called imbalance. When the imbalance occurs, the dynamic vibration reducer 500 not only cannot sufficiently exhibit its original vibration suppressing function, but also has a problem that the durability of the elastic body portion 543 is impaired. It should be noted that the types of vibrations transmitted to the propeller shaft may include vibrations of a relatively low frequency, and as a countermeasure, the spring constant of the elastic body portion 543 may be set low. In such a case, the problem of imbalance as described above becomes more apparent. Therefore, as described above, the dynamic vibration reducer 500 is provided with the slide bearing 520 to restrict the radial movement of the vibration ring 530 with respect to the hub 510.

According to the dynamic vibration reducer 500 configured as described above, it is possible to suppress the vibration of the propeller shaft in the rotational direction and to prevent the imbalance of the vibration ring 530 from occurring.

However, the vibration transmitted to the propeller shaft is not limited to the vibration in the rotation direction, and suppressing the resonance in the rotation direction by the dynamic vibration reducer 500 may not be sufficient as a countermeasure against the resonance. For example, during acceleration from the start of the automobile, the propeller shaft undergoes a vibration called windup vibration in the process of once deforming so as to sink and then returning to the original state. This vibration is a low-frequency vibration, and includes vibration in a direction (twisting direction) inclined with respect to the central axis of the propeller shaft. Therefore, it is desirable that the dynamic vibration reducer 500 also suppresses resonance with respect to the vibration. However, in the above-described conventional structure, the vibration ring 530 has a limited degree of freedom in the movement direction with respect to the hub 510, and can hardly move in the direction inclined with respect to the central axis of the propeller shaft. Therefore, in the dynamic vibration reducer 500 according to the conventional example, it is not possible to suppress the resonance with respect to the vibration in the direction tilted with respect to the central axis of the propeller shaft (twisting direction).

Japanese Utility Model Publication No. 63-171744 International Publication No. 2018/088103

An object of the present invention is to suppress the occurrence of imbalance while suppressing the resonance not only in the rotation direction vibration of the rotation shaft but also in the tilt direction vibration of the rotation shaft with respect to the central axis of the rotation shaft. To provide a dynamic vibration reducer.

The present invention adopts the following means in order to solve the above problems.

That is, the dynamic vibration reducer of the present invention,
A hub attached to the rotating shaft,
On the outer peripheral surface side of the hub, a vibration ring provided concentrically with the hub,
A pair of elastic body units connecting the hub and the vibration ring,
An annular slide bearing fitted to the outer peripheral surface of the hub and slidably provided with respect to the vibration ring at a position between the pair of elastic body units;
A dynamic vibration reducer comprising:
On the outer peripheral surface side of the slide bearing, a cross-sectional shape obtained by cutting the slide bearing at a surface including the central axis of the slide bearing has an arcuate annular protrusion protruding radially outward, and, On the inner peripheral surface side of the vibrating ring, a cross-sectional shape of the vibrating ring cut along a plane including the central axis of the vibrating ring has an arcuate annular concave portion that is recessed radially outward,
The outer peripheral surface of the annular protrusion and the inner peripheral surface of the annular recess are slidably in contact with each other.

According to the present invention, since the hub and the vibrating ring are connected by the pair of elastic body units, resonance of vibration in the rotation direction of the rotating shaft can be suppressed. Further, since the annular slide bearing fitted to the outer peripheral surface of the hub and slidably provided with respect to the vibration ring is provided, the radial movement of the vibration ring with respect to the hub is restricted. As a result, the occurrence of imbalance can be suppressed. Further, in the present invention, since the outer peripheral surface of the annular protruding portion on the outer peripheral surface side of the plain bearing and the inner peripheral surface of the annular concave portion on the inner peripheral surface side of the vibrating ring slidably contact, the vibrating ring is The hub is allowed to move in a direction inclined with respect to its central axis. Therefore, according to the dynamic vibration reducer of the present invention, it is possible to suppress resonance with respect to vibration in the tilt direction of the rotary shaft with respect to the central axis of the rotary shaft.

It is preferable that the vibrating ring is composed of two members divided on both sides in the central axis direction of the vibrating ring so that these two members can be attached from both sides of the slide bearing.

In addition, another dynamic vibration absorber of the present invention,
A hub attached to the rotating shaft,
On the outer peripheral surface side of the hub, a vibration ring provided concentrically with the hub,
A pair of elastic body units connecting the hub and the vibration ring,
An annular slide bearing fitted to the inner peripheral surface of the vibrating ring and provided slidably with respect to the hub at a position between the pair of elastic body units,
A dynamic vibration reducer comprising:
On the outer peripheral surface side of the hub, a cross-sectional shape obtained by cutting the hub along a surface including a central axis of the hub has an arcuate annular protrusion protruding outward in the radial direction, and the slide bearing The inner peripheral surface of is composed of a cylindrical surface,
An outer peripheral surface of the annular protrusion and an inner peripheral surface of the slide bearing are slidably in contact with each other.

Also in the present invention, since the hub and the vibrating ring are connected by the pair of elastic body units, resonance of vibration in the rotation direction of the rotating shaft can be suppressed. Since the annular slide bearing fitted to the inner peripheral surface of the vibration ring and slidably provided to the hub is provided, the radial movement of the vibration ring with respect to the hub is restricted. .. As a result, the occurrence of imbalance can be suppressed. Further, in the present invention, since the outer peripheral surface of the annular protruding portion on the outer peripheral surface side of the hub and the inner peripheral surface of the slide bearing slidably contact each other, the vibrating ring is attached to the hub with respect to the central axis thereof. It is allowed to move in a tilting direction. Therefore, also in the dynamic vibration reducer of the present invention, it is possible to suppress resonance of vibration in the tilt direction of the rotary shaft with respect to the central axis of the rotary shaft.

An annular groove that forms a gap with the outer peripheral surface of the slide bearing may be provided on the inner peripheral surface side of the vibration ring.

As a result, the slide bearing is allowed to deform so as to enter the annular groove, so that it is possible to prevent the sliding resistance between the slide bearing and the hub from increasing.

As described above, according to the present invention, resonance of not only vibration in the rotation direction of the rotation shaft but also vibration in the tilt direction of the rotation shaft with respect to the central axis of the rotation shaft is suppressed while suppressing the occurrence of unbalance. It can be suppressed.

1 is a front view of a dynamic vibration reducer according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the dynamic vibration reducer according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an assembly procedure of the dynamic vibration reducer according to the first embodiment of the present invention. FIG. 4 is an operation explanatory diagram of the dynamic vibration reducer according to the first embodiment of the present invention. FIG. 5 is a front view of the dynamic vibration reducer according to the second embodiment of the present invention. FIG. 6 is a schematic sectional view of a dynamic vibration reducer according to a second embodiment of the present invention. FIG. 7 is an operation explanatory diagram of the dynamic vibration reducer according to the second embodiment of the present invention. FIG. 8 is a schematic sectional view of a dynamic vibration reducer according to a third embodiment of the present invention. FIG. 9 is a schematic cross-sectional view of a dynamic vibration reducer according to a conventional example.

MODES FOR CARRYING OUT THE INVENTION Modes for carrying out the present invention will be exemplarily described in detail below based on embodiments with reference to the drawings. However, the dimensions, materials, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. ..

(Example 1)
A dynamic vibration damper (dynamic damper) according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is a front view of a dynamic vibration reducer according to a first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the dynamic vibration reducer according to the first embodiment of the present invention, which is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a diagram illustrating an assembly procedure of the dynamic vibration reducer according to the first embodiment of the present invention. In addition, in FIG. 3, each member is shown in a cross-sectional view. FIG. 4 is an operation explanatory diagram of the dynamic vibration reducer according to the first embodiment of the present invention. In addition, in FIG. 4, main members are shown in a cross-sectional view.

<Application example of dynamic vibration absorber>
The dynamic vibration reducer 100 according to the present embodiment can be suitably used, for example, for suppressing resonance of a propeller shaft (rotating shaft) provided in a vehicle body of an automobile. As described in the background art, the propeller shaft may generate vibration in each of the rotation direction (twisting direction) and the tilt direction (twisting direction) with respect to the central axis of the propeller shaft. By attaching the dynamic vibration reducer 100 according to this embodiment to the propeller shaft, resonance in each of these directions can be suppressed. In addition, the dynamic vibration reducer according to the present invention is not limited to such an application, and for various devices including a rotating shaft capable of generating vibrations in a plurality of directions as described above, resonance in each direction of the rotating shaft. Can be applied to suppress.

<Structure of dynamic vibration absorber>
In particular, the dynamic vibration reducer 100 according to the present embodiment will be described in more detail with reference to FIGS. 1 and 2. The dynamic vibration reducer 100 according to the present embodiment includes a hub 110 attached to a rotary shaft such as a propeller shaft, a vibration ring 130 provided concentrically with the hub 110 on the outer peripheral surface side of the hub 110, the hub 110 and the vibration ring. It includes a pair of elastic body units 140 that connect 130 to each other. The dynamic vibration reducer 100 also includes an annular slide bearing 120 fitted to the outer peripheral surface of the hub 110 and provided slidably with respect to the vibration ring 130 at a position between the pair of elastic body units 140. I have it.

The hub 110 is made of metal and includes a cylindrical portion 111 and an inward flange portion 112 provided at one end of the cylindrical portion 111. The rotary shaft is inserted inside the inner peripheral surface 112a at the tip of the inward flange portion 112. The slide bearing 120 is made of a resin-made substantially cylindrical member. A dry bearing can be preferably used as the slide bearing 120. The inner peripheral surface of the plain bearing 120 is a cylindrical surface, and the inner diameter thereof is designed to be substantially the same as the outer diameter of the outer peripheral surface of the cylindrical portion 111 of the hub 110. Accordingly, the slide bearing 120 can be fixed to the outer peripheral surface of the cylindrical portion 111 by fitting.

The vibrating ring 130 is composed of an annular member made of metal. More specifically, the vibrating ring 130 includes a cylindrical portion 131 and an annular convex portion 132 that extends radially inward from the center of the cylindrical portion 131. Therefore, the sectional shape of the vibrating ring 130 taken along a plane including the central axis of the vibrating ring 130 is substantially T-shaped as shown in FIG. Further, the vibrating ring 130 according to the present embodiment is composed of two members divided on both sides in the central axis direction of the vibrating ring 130 from the viewpoint of assembly. For convenience of explanation, the two members will be referred to as a first vibrating ring component 130A and a second vibrating ring component 130B, respectively. The inner peripheral surface of the annular convex portion 132 in the vibrating ring 130 configured as described above is slidably provided on the outer peripheral surface of the slide bearing 120.

Then, in the dynamic vibration reducer 100, when vibration of a frequency at which the rotary shaft resonates is transmitted, the vibration ring 130 vibrates, thereby exhibiting a function of suppressing resonance of the rotary shaft. In the dynamic vibration reducer 100 according to the present embodiment, with respect to each vibration of the rotating shaft in the rotating direction (twisting direction) and in the tilting direction of the rotating shaft with respect to the central axis of the rotating shaft (twisting direction), The vibrating ring 130 is designed to suppress the resonance of the rotating shaft.

Further, elastic body units 140 are provided on both sides of the annular convex portion 132 of the vibrating ring 130, respectively. The elastic unit 140 includes a first cylindrical member 141 fitted and fixed to the outer peripheral surface of the cylindrical portion 111 of the hub 110, and a second cylindrical member 141 fitted and fixed to the inner peripheral surface of the cylindrical portion 131 of the vibration ring 130. The member 142 and the elastic body portion 143 made of an elastic body such as rubber and fixed to the member 142. Each of the first cylindrical member 141 and the second cylindrical member 142 is composed of a metal ring having an L-shaped cross section. The elastic body portion 143 is obtained by vulcanization molding, and is vulcanized and adhered to the first cylindrical member 141 and the second cylindrical member 142, respectively. Further, the elastic body portion 143 has a shape in which the center bulges outward in the axial direction.

Then, on the outer peripheral surface side of the slide bearing 120 according to the present embodiment, a cross-sectional shape of the slide bearing 120 cut along a plane including the central axis of the slide bearing 120 has an arcuate annular protrusion 121 that protrudes outward in the radial direction. have. Further, on the inner peripheral surface side of the vibrating ring 130, a cross-sectional shape obtained by cutting the vibrating ring 130 along a plane including the central axis of the vibrating ring 130 has an arcuate annular recess 132a that is recessed radially outward. Further, in the dynamic vibration reducer 100 according to the present embodiment, the outer peripheral surface of the annular protrusion 121 and the inner peripheral surface of the annular recess 132a are slidably in contact with each other. In addition, in the cross-sectional shape of the plain bearing 120 cut along a plane including the central axis of the plain bearing 120, a cross section obtained by cutting the vibrating ring 130 along a radius of curvature of the outer shape of the annular protrusion 121 and a plane including the central axis of the vibrating ring 130. In terms of shape, the arc-shaped annular recess 132a that is recessed radially outward is designed to have the same radius of curvature. As a result, the outer peripheral surface of the annular protrusion 121 and the inner peripheral surface of the annular recess 132a are slidable.

<How to assemble the dynamic vibration absorber>
A method for assembling the dynamic vibration reducer 100 according to the present embodiment will be described with reference to FIG. First, the slide bearing 120 is fixed to the outer peripheral surface of the cylindrical portion 111 of the hub 110 by fitting. Then, the first vibrating ring component 130A and the second vibrating ring component 130B are attached from both sides of the plain bearing 120 (see arrows S1 and S2 in FIG. 3). The first vibrating ring component 130A is provided with a fitting concave portion 130A1, and the second vibrating ring component 130B is provided with a fitting convex portion 130B1. By fitting the fitting concave portion 130A1 and the fitting convex portion 130B1, the first vibrating ring component 130A and the second vibrating ring component 130B are fixed, and the vibrating ring 130 is obtained. Finally, the elastic body units 140 are attached from both sides of the vibration ring 130 (see arrows T1 and T2 in FIG. 3).

<Operation of dynamic vibration absorber>
The operation of the dynamic vibration reducer 100 according to the present embodiment will be described with reference to FIG. Note that, in FIG. 4, only the main components are shown and the hatching and depth lines are omitted as appropriate for the sake of easy understanding of the operation. As described above, the outer peripheral surface of the annular protrusion 121 on the outer peripheral surface side of the bearing 120 and the inner peripheral surface of the annular recess 132a on the inner peripheral surface side of the vibrating ring 130 slidably contact each other. As a result, the vibration ring 130 is allowed to move with respect to the bearing 120 in a direction inclined with respect to these central axes (direction of arrow X in FIG. 4 ).

<Advantages of the dynamic vibration reducer according to this example>
According to the dynamic vibration reducer 100 of this embodiment, since the hub 110 and the vibration ring 130 are connected by the pair of elastic body units 140, resonance of vibration in the rotation direction of the rotation shaft is suppressed. can do. Further, since the annular slide bearing 120 fitted to the outer peripheral surface of the hub 110 and provided slidably with respect to the vibration ring 130 is provided, the vibration ring 130 moves in the radial direction with respect to the hub 110. Is regulated. As a result, the occurrence of imbalance can be suppressed.

Further, as described above, the vibration ring 130 is allowed to move with respect to the hub 110 in a direction inclined with respect to the central axis line thereof. Therefore, according to the dynamic vibration reducer 100 of the present embodiment, resonance can be suppressed even for vibration in the tilt direction of the rotary shaft with respect to the central axis of the rotary shaft.

(Example 2)
Second Embodiment A dynamic vibration reducer (dynamic damper) according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a front view of the dynamic vibration reducer according to the second embodiment of the present invention. 6 is a schematic cross-sectional view of a dynamic vibration reducer according to a second embodiment of the present invention, which is a BB cross-sectional view in FIG. FIG. 7 is an operation explanatory diagram of the dynamic vibration reducer according to the second embodiment of the present invention. In addition, in FIG. 7, main members are shown in a cross-sectional view.

An application example of the dynamic vibration reducer 100X according to the present embodiment is the same as that of the above-described first embodiment, and thus the description thereof will be omitted.

<Structure of dynamic vibration absorber>
In particular, the dynamic vibration reducer 100X according to the present embodiment will be described in more detail with reference to FIGS. 5 and 6. The dynamic vibration reducer 100X according to the present embodiment includes a hub 110X attached to a rotating shaft such as a propeller shaft, a vibration ring 130X provided concentrically with the hub 110X on the outer peripheral surface side of the hub 110X, the hub 110X and the vibration ring. It is provided with a pair of elastic body units 140X for connecting with 130X. Further, the dynamic vibration reducer 100X is fitted on the inner peripheral surface of the vibration ring 130X and is an annular slide bearing 120X slidably provided with respect to the hub 110X at a position between the pair of elastic body units 140X. Is also equipped. A gap is provided between the plain bearing 120X and the elastic body unit 140X as shown in FIG. As a result, the plain bearing 120X is allowed to move in the central axis direction.

The hub 110X is made of a substantially cylindrical member made of metal. The rotary shaft is inserted inside the cylindrical hub 110X. The plain bearing 120X is made of a resin-made substantially cylindrical member. A dry bearing can be suitably used as the slide bearing 120X. The outer peripheral surface of the plain bearing 120X is formed of a cylindrical surface, and its outer diameter is designed to be substantially the same as the inner diameter of the inner peripheral surface of the vibrating ring 130X (the inner peripheral surface of the annular convex portion 132X). ing. As a result, the slide bearing 120X can be fixed to the inner peripheral surface of the vibration ring 130X by fitting.

The vibrating ring 130X is composed of an annular member made of metal. More specifically, the vibrating ring 130X includes a cylindrical portion 131X and an annular convex portion 132X extending radially inward from the center of the cylindrical portion 131X. Therefore, the sectional shape of the vibrating ring 130X taken along a plane including the central axis of the vibrating ring 130X is substantially T-shaped as shown in FIG.

Then, in the dynamic vibration reducer 100X, when vibration of a frequency at which the rotary shaft resonates is transmitted, the vibration ring 130X vibrates, thereby exhibiting a function of suppressing resonance of the rotary shaft. In the dynamic vibration reducer 100X according to the present embodiment, vibrations in the rotation direction (twisting direction) of the rotary shaft, vibrations in the axial direction of the rotary shaft, and tilt directions (twisting direction) in the rotary shaft with respect to the central axis of the rotary shaft. The vibration ring 130X is designed so as to suppress the resonance of the rotating shaft for each vibration.

Further, elastic body units 140X are provided on both sides of the annular convex portion 132X in the vibration ring 130X. The elastic unit 140X includes a first cylindrical member 141X fitted and fixed to the outer peripheral surface of the hub 110X, and a second cylindrical member 142X fitted and fixed to the inner peripheral surface of the cylindrical portion 131X of the vibrating ring 130X. , And an elastic body portion 143X made of an elastic body such as rubber fixed to each of these. Each of the first cylindrical member 141X and the second cylindrical member 142X is composed of a metal ring having a rectangular cross section. The elastic body portion 143X is obtained by vulcanization molding, and is vulcanized and adhered to the first cylindrical member 141X and the second cylindrical member 142X, respectively.

Then, on the outer peripheral surface side of the hub 110X according to the present embodiment, a cross-sectional shape of the hub 110X cut along a plane including the central axis of the hub 110X has an arcuate annular protruding portion 111X protruding radially outward. ing. Further, the inner peripheral surface of the slide bearing 120X is formed of a cylindrical surface. In the dynamic vibration reducer 100X according to the present embodiment, the outer peripheral surface of the annular protruding portion 111X and the inner peripheral surface of the slide bearing 120 are slidably in contact with each other.

<Operation of dynamic vibration absorber>
The operation of the dynamic vibration reducer 100X according to the present embodiment will be described with reference to FIG. 7. Note that in FIG. 7, only the main components are shown and the hatching and depth lines are omitted as appropriate for the sake of easy understanding of the operation. As described above, the outer peripheral surface of the annular protrusion 111X on the outer peripheral surface side of the hub 110X and the inner peripheral surface of the slide bearing 120X are slidably in contact with each other. As a result, the vibration ring 130X is allowed to move integrally with the slide bearing 120X in the direction inclined with respect to the central axis of the hub 110X (direction of arrow Y in FIG. 7).

<Advantages of the dynamic vibration reducer according to this example>
According to the dynamic vibration reducer 100X of the present embodiment, since the hub 110X and the vibration ring 130X are connected by the pair of elastic body units 140X, the resonance of vibration in the rotation direction of the rotating shaft is suppressed. can do. Since the annular slide bearing 120X fitted to the inner peripheral surface of the vibration ring 130X and slidably provided with respect to the hub 110X is provided, the radial direction of the vibration ring 130X with respect to the hub 110X is increased. Movement is restricted. As a result, the occurrence of imbalance can be suppressed.

Further, as described above, the vibrating ring 130X is allowed to move with respect to the hub 110X in a direction inclined with respect to the central axis thereof. Therefore, according to the dynamic vibration reducer 100X according to the present embodiment, it is possible to suppress resonance with respect to vibration in the tilt direction of the rotary shaft with respect to the central axis of the rotary shaft.

(Example 3)
FIG. 8 shows Embodiment 3 of the present invention. In the present embodiment, a configuration in which a part of the configuration in the above-mentioned Embodiment 2 is changed is shown. Since the basic configuration and operation are the same as those of the second embodiment, the same reference numerals are given to the same components and the description thereof will be omitted.

FIG. 8 is a schematic sectional view of a dynamic vibration reducer according to a third embodiment of the present invention. The dynamic vibration reducer 100Y according to the present embodiment also includes the hub 110X, the slide bearing 120X, the vibrating ring 130Y, and the pair of elastic body units 140X, as in the case of the second embodiment. The configurations of the hub 110X, the sliding bearing 120X, and the pair of elastic body units 140X are the same as the configurations of the dynamic vibration reducer 100X in the above-described first embodiment, and therefore description thereof will be omitted.

The vibrating ring 130Y according to the present embodiment is also composed of an annular member made of metal. More specifically, the vibrating ring 130Y includes a cylindrical portion 131Y and an annular convex portion 132Y extending inward in the radial direction from the center of the cylindrical portion 131Y. Therefore, the cross-sectional shape of the vibrating ring 130Y taken along a plane including the central axis of the vibrating ring 130Y is substantially T-shaped as shown in FIG.

Also in the dynamic vibration reducer 100Y according to the present embodiment, when vibration of a frequency at which the rotary shaft resonates is transmitted, the vibration ring 130Y vibrates, thereby exhibiting a function of suppressing resonance of the rotary shaft. In the dynamic vibration reducer 100Y according to the present embodiment, vibrations in the rotation direction (twisting direction) of the rotary shaft, vibrations in the axial direction of the rotary shaft, and tilt directions (twisting direction) in the rotary shaft with respect to the central axis of the rotary shaft. The vibrating ring 130Y is designed so as to suppress the resonance of the rotating shaft for each vibration.

Here, an annular groove 133Y that forms a gap with the outer peripheral surface of the slide bearing 120X is provided on the inner peripheral surface side of the annular convex portion 132Y in the vibrating ring 130Y according to the present embodiment. The dynamic vibration reducer 100Y according to the present embodiment differs from the dynamic vibration reducer 100X according to the second embodiment only in that the annular groove 133Y is provided.

It goes without saying that the dynamic vibration absorber 100Y according to the present embodiment configured as described above can also achieve the same effects as those of the dynamic vibration absorber 100X according to the second embodiment. Further, in the dynamic vibration reducer 100Y according to the present embodiment, since the annular groove 133Y is provided on the inner peripheral surface of the vibrating ring 130Y, the sliding bearing 120X is allowed to deform so as to enter the annular groove 133Y. .. Therefore, it is possible to prevent the sliding resistance between the slide bearing 120X and the hub 110X from increasing.

(Other)
The elastic body unit included in the dynamic vibration reducer of the present invention is not limited to the configurations of the elastic body units 140 and 140X shown in the above embodiments, and various known techniques can be adopted. Therefore, in the dynamic vibration absorber 100 shown in the first embodiment, the elastic body unit 140X shown in the second and third embodiments can be applied instead of the elastic body unit 140. Similarly, in the dynamic vibration reducers 100X and 100Y shown in the second and third embodiments, the elastic body unit 140 shown in the first embodiment can be applied instead of the elastic body unit 140X.

100,100X,100Y Dynamic vibration absorber 110,110X Hub 111 Cylindrical part 111X Annular protrusion part 112 Inward flange part 112a Inner peripheral surface 120,120X Bearing 121 Annular protrusion part 130,130X,130Y Vibratory ring 130A First vibrating ring part 130A1 Fitting recess 130B Second vibrating ring part 130B1 Fitting convex part 131, 131X, 131Y Cylindrical part 132, 132X, 132Y Annular convex part 132a Annular recess 133Y Annular groove 140, 140X Elastic body unit 141, 141X First cylindrical member 142,142X 2nd cylindrical member 143,143X elastic body part

Claims (4)

A hub attached to the rotating shaft,
On the outer peripheral surface side of the hub, a vibration ring provided concentrically with the hub,
A pair of elastic body units connecting the hub and the vibration ring,
An annular slide bearing fitted to the outer peripheral surface of the hub and slidably provided with respect to the vibration ring at a position between the pair of elastic body units;
A dynamic vibration reducer comprising:
On the outer peripheral surface side of the slide bearing, a cross-sectional shape obtained by cutting the slide bearing at a surface including the central axis of the slide bearing has an arcuate annular protrusion protruding radially outward, and, On the inner peripheral surface side of the vibrating ring, the cross-sectional shape of the vibrating ring cut along a plane including the central axis of the vibrating ring has an arcuate annular concave portion that is recessed radially outward,
A dynamic vibration absorber, wherein an outer peripheral surface of the annular protruding portion and an inner peripheral surface of the annular concave portion are slidably in contact with each other. The vibrating ring is composed of two members divided on both sides in the central axis direction of the vibrating ring so that these two members can be attached from both sides of the slide bearing, respectively. The dynamic vibration reducer according to claim 1. A hub attached to the rotating shaft,
On the outer peripheral surface side of the hub, a vibration ring provided concentrically with the hub,
A pair of elastic body units connecting the hub and the vibration ring,
An annular slide bearing fitted to the inner peripheral surface of the vibrating ring and slidably provided with respect to the hub at a position between the pair of elastic body units,
A dynamic vibration reducer comprising:
On the outer peripheral surface side of the hub, a cross-sectional shape obtained by cutting the hub along a surface including a central axis of the hub has an arcuate annular protrusion protruding outward in the radial direction, and the slide bearing The inner peripheral surface of is composed of a cylindrical surface,
A dynamic vibration absorber, wherein an outer peripheral surface of the annular protruding portion and an inner peripheral surface of the slide bearing are slidably in contact with each other. The dynamic vibration reducer according to claim 3, wherein an annular groove that forms a gap with the outer peripheral surface of the slide bearing is provided on the inner peripheral surface side of the vibration ring.

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