JP5912072B2 - Dynamic vibration absorber - Google Patents

Description

  The present invention relates to a dynamic vibration absorber that attenuates vibration associated with torque fluctuation input from a power source such as an engine.

  As described in Patent Document 1, the dynamic vibration absorber includes a dynamic vibration absorber body in which a plurality of rolling chambers are arranged along the circumferential direction, and each rolling chamber has a disk-shaped rolling element. It is housed in a rollable state. When the dynamic vibration absorber body rotates at a constant speed, the rolling element is in a state of being in contact with the outermost portion of the outer edge of the rolling chamber (hereinafter also referred to as “outer edge”). It is designed to rotate integrally with the vessel body. Here, the “outermost position of the outer edge portion” refers to a portion located on the outermost radial direction at the outer edge portion.

  On the other hand, when torque fluctuation is input to the dynamic vibration absorber, the rotational speed of the dynamic vibration absorber body changes. At this time, the rolling element moves relative to the dynamic vibration absorber main body along the outer edge from the outermost position. Such relative movement of the rolling elements suppresses a change in the rotational speed of the dynamic vibration absorber body, and attenuates vibration associated with torque fluctuations.

  In the dynamic vibration absorber described in Patent Literature 1, the radius of curvature of the outer edge portion is substantially elliptical. Therefore, when the moving body moves along such an outer edge, the linear distance connecting the center of gravity of the moving body and the center of curvature of the outermost position gradually increases as the moving body moves away from the outermost position in the circumferential direction. It's getting longer.

  By the way, as the shape of the outer edge portion, various shapes different from the shape of the outer edge portion of the dynamic vibration absorber described in Patent Document 1 are conceivable. An example of such an outer edge is one that gradually increases the radius of curvature from the outermost position in the circumferential direction. According to this, when the rolling element swings with respect to the dynamic vibration absorber main body along the outer edge due to the input of torque fluctuation to the dynamic vibration absorber main body, the rolling edge is less than the case where the outer edge has an arc shape. The moving body can be largely moved relative to the dynamic vibration absorber body. For this reason, it is possible to expect an improvement in vibration damping efficiency associated with torque fluctuation.

JP 2000-18329 A

As a method for further increasing the damping efficiency of vibration accompanying torque fluctuation, there are a first method for increasing the number of rolling elements used and a second method using a heavy rolling element.
In order to employ the first method, the number of rolling chambers provided along the circumferential direction in the dynamic vibration absorber body is increased. However, if the outer edge is formed into a shape in which the radius of curvature gradually increases as it moves away from the outermost position in the circumferential direction, the width in the circumferential direction of the rolling chamber is such that the outer edge is formed in an arc shape with a constant curvature. Compared to wider. That is, a large space is required to provide one rolling chamber. Therefore, there is a possibility that the number of rolling chambers that can be provided in the dynamic vibration absorber body may be reduced, and the number of rolling elements used may be reduced.

  Moreover, in order to employ | adopt a 2nd method, since a large rolling element will be used, it is preferable to widen the space | interval of each rolling chamber adjacent to each other in the circumferential direction. However, as described above, the width of the rolling chambers having the above-described configuration in the circumferential direction is wide, so that the number of rolling chambers that can be provided in the dynamic vibration absorber body may be reduced by widening the interval between the rolling chambers. There is. In this case, even if a heavy rolling element is used, the number of rolling elements used decreases, so it is difficult to say that the damping efficiency of vibration associated with torque fluctuation can be increased.

  The present invention has been made in view of such circumstances. An object of the present invention is to provide a dynamic vibration absorber capable of increasing the damping efficiency of vibration accompanying torque fluctuation.

In the following, means for achieving the above object and its operation will be described.
One aspect of the present invention includes a dynamic vibration absorber body that rotates around a predetermined axis and includes a plurality of rolling chambers along the circumferential direction, and the rolling chamber has an outer edge in the radial direction. Is assumed to be a dynamic vibration absorber that accommodates rolling elements that can roll along. The radially outer edge includes a first region in which the radius of curvature gradually increases as the outermost position located on the outermost side in the radial direction is the center in the circumferential direction, and the distance from the outermost position increases in the circumferential direction. And a second region formed with a radius of curvature smaller than the radius of curvature of the circumferentially outer portion of the first region.

According to the above arrangement, the minute the entire radially outer edge, compared to the radius of curvature is gradually larger shape with distance from the outermost portion in the circumferential direction, providing the second region, The width in the circumferential direction of one rolling chamber can be narrowed. As a result, it is possible to increase the number of rolling chambers arranged along the circumferential direction, that is, to increase the number of rolling elements that can be used, or to increase the spacing between the rolling chambers adjacent to each other in the circumferential direction. It can be used without reducing the number of uses. Therefore, it is possible to increase the damping efficiency of vibration accompanying torque fluctuation.

  In the above configuration, when the curvature radius at the outermost position of the first region is the first curvature radius and the curvature radius of the second region is the second curvature radius, the second curvature radius is the first curvature radius. It is preferable to set the radius or less. Thereby, the width | variety in the circumferential direction of one rolling chamber can be narrowed compared with the case where a 2nd curvature radius is larger than a 1st curvature radius.

  In addition, it is preferable to provide the second regions on both sides in the circumferential direction of the first region. Thereby, the width | variety in the circumferential direction of one rolling chamber can be narrowed compared with the case where a 2nd area | region is provided only in the circumferential direction of a 1st area | region.

In addition, as a shape of a 1st area | region, it is preferable to set it as a shape where the movement locus | trajectory of the gravity center of the rolling element which moves along this 1st area | region becomes a hanging curve shape.
Moreover, you may provide a pair of axial part which protrudes in the rolling element on both sides in an axial direction. In this case, the dynamic vibration absorber is disposed on both sides in the axial direction of the dynamic vibration absorber body, and a pair of support members that support the rolling element so as to roll freely through the shaft portion, and the movement of the rolling element in the axial direction. It is preferable to further comprise limiting means for limiting

  According to the said structure, the sliding contact of the side surface of a rolling element and the side surface of a support member is suppressed by the movement to the axial direction of a rolling element being restrict | limited. As a result, when a torque fluctuation is input to the dynamic vibration absorber, the rolling element can be moved relatively relative to the dynamic vibration absorber body, and the damping efficiency of the vibration accompanying the torque fluctuation can be increased. become.

  In addition, as a limiting means, while being provided in the edge part of the radial direction outer side of a rolling chamber over the perimeter of the surrounding surface of the rolling element provided along the extending direction of this edge part, and a rolling element, And a groove portion having a width wider than the width in the axial direction of the ridge portion. Thereby, the movement of the rolling element in the axial direction is restricted, and the sliding contact between the side surface of the rolling element and the side surface of the support member can be suppressed.

  And in such a structure, it is preferable to make the depth dimension of a groove part longer than the height dimension of a protrusion part. Thereby, when the rolling element relatively moves along the edge, sliding contact between the tip of the protrusion and the bottom of the groove is avoided. As a result, when the rotational speed of the dynamic vibration absorber body changes due to the input of torque fluctuation, compared to the case where the tip of the ridge portion is in sliding contact with the bottom surface of the groove portion, the rotation that moves relative to the dynamic vibration absorber main body is performed. The moving body can efficiently apply force to the dynamic vibration absorber main body, and the change in the rotational speed of the dynamic vibration absorber main body can be easily suppressed. Therefore, it is possible to increase the damping efficiency of vibration associated with torque fluctuation.

  Further, when the width in the axial direction of the rolling element is wider than the width in the axial direction of the dynamic vibration absorber body, the limiting means is provided over the entire circumference of the rolling element, and the dynamic vibration absorber The structure including the groove part which has a width | variety wider than the width | variety in the axial direction of a main body may be sufficient. As a result, the radially outer edge is positioned in the groove of the rolling element, and the movement of the rolling element in the axial direction is restricted by the engagement between the edge and the groove, thereby supporting the side surface and the support of the rolling element. It is possible to suppress sliding contact with the side surface of the member.

  In addition, the limiting means is provided on the annular protrusion provided over the entire circumference of the peripheral surface of the rolling element and the radially outer edge along the extending direction of the edge, and the protrusion And a groove portion having a width wider than the width in the axial direction of the portion. As a result, the protrusion of the rolling element is located in the groove provided on the radially outer edge of the rolling chamber, and the axial engagement of the rolling element by the engagement of the protrusion and the groove. The movement is limited, and the sliding contact between the side surface of the rolling element and the side surface of the support member can be suppressed.

  And in such a structure, you may make the depth dimension of a groove part shorter than the height dimension of a protrusion part. As a result, when the rolling element moves relative to the edge, the tip of the protrusion is in sliding contact with the bottom surface of the groove, while the portion and the edge are located on both sides of the protrusion on the circumferential surface of the rolling element. Sliding contact with is avoided. As a result, when the rotational speed of the dynamic vibration absorber body changes due to the input of torque fluctuation, compared to the case where the portions located on both sides of the ridge portion on the peripheral surface of the rolling element also slide in contact with the edge portion, this dynamic vibration absorption The rolling element that moves relative to the main body of the vibrator can efficiently apply force to the main body of the dynamic vibration absorber, and the change in the rotational speed of the main body of the dynamic vibration absorber can be easily suppressed. Therefore, it is possible to increase the damping efficiency of vibration associated with torque fluctuation.

  Moreover, you may make the depth dimension of a groove part longer than the height dimension of a protrusion part. As a result, when the rolling element moves relatively along the edge, the tip of the protrusion does not slide on the bottom surface of the groove, while the portions located on both sides of the protrusion on the circumferential surface of the rolling element are edges. Touch the part. As a result, when the rotational speed of the dynamic vibration absorber body changes due to the input of torque fluctuation, the tip of the ridge portion also moves relative to the dynamic vibration absorber body as compared with the case where the tip of the ridge portion also slides on the bottom surface of the groove portion. The rolling element can efficiently apply a force to the dynamic vibration absorber main body, and the change in the rotation speed of the dynamic vibration absorber main body can be easily suppressed. Therefore, it is possible to increase the damping efficiency of vibration associated with torque fluctuation.

  Further, the rolling element is configured to gradually become thicker or thinner as it goes inward in the axial direction, and the radially outer edge of the rolling chamber has a shape corresponding to the peripheral surface of the rolling element. May have. In this case, the limiting means is constituted by the peripheral surface of the rolling element and the outer edge of the radial direction. By adopting such a configuration, it is possible to limit the movement of the rolling element in the axial direction, and to suppress sliding contact between the side surface of the rolling element and the side surface of the support member.

  The restricting means includes a contact portion that is provided on both the support members, and that contacts the tip of the shaft portion with a gap interposed between the side surface of the support member and the side surface of the rolling element. May be. Thereby, even if the rolling element tries to move in the axial direction, the tip of the shaft part comes into contact with the abutting part before the side surface of the rolling element comes into contact with the opposing surface of the support member, and further movement of the rolling element in the axial direction. Is regulated. As a result, it is possible to suppress sliding contact between the side surface of the rolling element and the opposing surface of the support member.

The top view which shows one Embodiment of the dynamic vibration damper of this invention. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. The enlarged view to which a part of dynamic vibration absorber was expanded. The top view which shows the dynamic vibration damper main body of a comparative example. The top view which shows the dynamic vibration damper main body of embodiment. (A) is an enlarged view which shows a part of dynamic vibration absorber of another embodiment, (b) is a 6-6 line arrow directional cross-sectional view of Fig.6 (a). (A) is an enlarged view which shows a part of dynamic vibration absorber of another embodiment, (b) is a 7-7 line arrow directional cross-sectional view of Fig.7 (a). (A) is an enlarged view showing a part of a dynamic vibration absorber of another embodiment, (b) is a cross-sectional view taken along line 8-8 in FIG. 8 (a). (A) is an enlarged view showing a part of a dynamic vibration absorber of another embodiment, (b) is a cross-sectional view taken along line 9-9 in FIG. 9 (a). (A) is an enlarged view showing a part of a dynamic vibration absorber of another embodiment, (b) is a sectional view taken along line 10-10 in FIG. 10 (a). (A) is an enlarged view showing a part of a dynamic vibration absorber of another embodiment, (b) is a sectional view taken along line 11-11 in FIG. 11 (a).

An embodiment embodying the present invention will be described with reference to FIGS. The direction in which the axis S extends is referred to as the “axis direction”.
As shown in FIG. 1, the dynamic vibration absorber 21 of the present embodiment includes a dynamic vibration absorber body 22 having a substantially annular shape in plan view that rotates about an axis S orthogonal to the paper surface in FIG. 1. The dynamic vibration absorber body 22 of the present embodiment is composed of a single plate material having a relatively large thickness. The dynamic vibration absorber body 22 is formed with a plurality of rolling chambers 23 arranged at substantially equal intervals along the circumferential direction. Each of the rolling chambers 23 is open to the inner peripheral edge 221 side of the dynamic vibration absorber body 22. A partition wall 24 that partitions each rolling chamber 23 is provided between the rolling chambers 23 adjacent to each other in the circumferential direction.

  As shown in FIGS. 1 and 2, the dynamic vibration absorber 21 of the present embodiment includes a roller 30 as an example of a rolling element that rolls in a rolling chamber 23. The roller 30 has a circular shape in plan view, and is thicker than the dynamic vibration absorber body 22. In addition, the roller 30 of this embodiment may be comprised from one board | plate material, and the structure which laminated | stacked the several board | plate material may be sufficient as it.

  In the circumferential surface 31 of the roller 30, an annular groove 32 is provided over the entire circumference in the center in the axial direction. The width dimension (that is, the length dimension in the axial direction) of the groove 32 is slightly larger than the thickness dimension (that is, the length dimension in the axial direction) of the dynamic vibration absorber body 22. At least a part of the radially outer edge (hereinafter also referred to as “outer edge 25”) of the rolling chamber 23 is located in the groove 32. The engagement between the outer edge 25 and the groove 32 restricts the movement of the roller 30 in the axial direction. Therefore, in the present embodiment, the outer edge portion 25 and the groove portion 32 constitute “a restricting means for restricting the movement of the rolling element in the axial direction”.

A shaft portion 33 protrudes in the axial direction from the center from both side surfaces 301 that are substantially orthogonal to the axial direction of the roller 30.
On both sides of the dynamic vibration absorber main body 22 in the axial direction, guide members 40 as examples of support members are provided. The pair of guide members 40 form an annular shape and are fixed so as to rotate integrally with the dynamic vibration absorber body 22. A support portion 41 that supports the shaft portion 33 of the roller 30 is formed on the outer peripheral side of the guide member 40. In other words, the pair of guide members 40 supports the roller 30 via the shaft portion 33 so as to roll freely in the rolling chamber 23.

  The side surface 401 of the guide member 40 faces the side surface 301 of the roller 30 with a gap interposed therebetween. In this embodiment, since the movement of the roller 30 in the axial direction is limited by the engagement between the outer edge 25 and the groove 32, the sliding contact between the side surface 301 of the roller 30 and the side surface 401 of the guide member 40 is avoided. Has been.

Next, the shape of the outer edge 25 will be described in detail with reference to FIG.
As shown in FIG. 3, the outer edge 25 is configured such that a plurality of regions 51 and 52 are continuous along the circumferential direction. That is, the center in the circumferential direction in the outer edge 25 is the outermost position P1 located on the outermost side in the radial direction. The first region 51 including the outermost position P1 is formed such that the radius of curvature gradually increases as the distance from the outermost position P1 in the circumferential direction increases. The first region 51 of the present embodiment is formed such that the movement locus of the center of gravity C of the roller 30 has a suspended curve shape.

  Moreover, the 2nd area | region 52 located in the both sides in the circumferential direction of the 1st area | region 51 becomes circular arc shape formed with a fixed curvature. Specifically, the radius of curvature at the outermost position P1 is defined as “first radius of curvature”, the radius of curvature at the second region 52 is defined as “second radius of curvature”, and the first region The radius of curvature at the outermost position P3 in the circumferential direction 51 is referred to as a “third radius of curvature”. In the present embodiment, the second curvature radius is smaller than the first and third curvature radii. Thereby, the width | variety in the circumferential direction of the one rolling chamber 23 becomes narrow.

Here, the dynamic vibration absorber main body 22A of the comparative example and the dynamic vibration absorber main body 22 of the present embodiment will be compared with reference to FIG. 4 and FIG.
In the dynamic vibration absorber main body 22A of the comparative example shown in FIG. 4, the outer edge 25A is formed so that the radius of curvature gradually increases as it moves away from the outermost position P1 in the circumferential direction. That is, no region corresponding to the second region is formed in the outer edge portion 25A. In this case, compared with the case of this embodiment, the width in the circumferential direction of one rolling chamber 23A will become wide.

  As a result, as is clear from FIGS. 4 and 5, the number of rolling chambers 23A that can be arranged along the circumferential direction in the dynamic vibration absorber main body 22A of the comparative example is the same as that of the dynamic vibration absorber main body 22 of the present embodiment. The number is less than the number of rolling chambers 23 that can be arranged along the direction. In other words, in this embodiment, the number of rolling chambers 23 that can be arranged along the circumferential direction can be increased without changing the interval between the rolling chambers adjacent to each other in the circumferential direction. As a result, the number of rollers 30 that can be used in the dynamic vibration absorber 21 of the present embodiment is greater than the number of rollers 30 that can be used in the dynamic vibration absorber of the comparative example.

Next, the effect | action of the dynamic vibration damper 21 of this embodiment is demonstrated.
When the dynamic vibration absorber main body 22 rotates at a constant speed by inputting torque to the dynamic vibration absorber 21, the roller 30 is positioned in the vicinity of the outermost position P1 of the outer edge 25 by the centrifugal force acting on itself. Rotate substantially integrally with the dynamic vibration absorber body 22. When torque fluctuation is input to the dynamic vibration absorber 21 in this state, the rotational speed of the dynamic vibration absorber body 22 varies.

  At this time, the roller 30 moves relative to the dynamic vibration absorber body 22 along the outer edge 25. That is, the roller 30 comes into sliding contact with the outer edge 25 at a position with a small radius of curvature. As a result, even when the rocking range of the roller 30 is wide, slippage hardly occurs between the roller 30 and the contact portion of the outer edge 25 with the roller 30, and the roller 30 has a constant outer edge 25. It becomes easier to move along the outer edge 25 than in the case of curvature. Therefore, the vibration accompanying the torque fluctuation is effectively damped.

Further, as the number of rollers 30 used increases as in this embodiment, the damping efficiency of vibration associated with torque fluctuation is further improved.
As described above, in the present embodiment, the following effects can be obtained.

  (1) Compared with the comparative example, the width of one rolling chamber 23 in the circumferential direction can be reduced by providing the second region 52 on the outer side in the circumferential direction of the first region 51. As a result, the number of rolling chambers 23 arranged along the circumferential direction, that is, the rollers 30 can be increased. Therefore, it is possible to increase the damping efficiency of vibration accompanying torque fluctuation.

  (2) In the present embodiment, the rolling chamber 23 is formed so that the second radius of curvature is smaller than the first radius of curvature. Therefore, compared with the case where the rolling chamber 23 is formed so that the second radius of curvature is larger than the first radius of curvature, the width in the circumferential direction of one rolling chamber 23 can be reduced.

  (3) Further, the outer edge 25 of the present embodiment has a configuration in which the second regions 52 are provided on both sides in the circumferential direction of the first region 51. Therefore, the width of one rolling chamber 23 in the circumferential direction can be reduced as compared with the case where the second region 52 is provided only on one side in the circumferential direction of the first region 51.

  (4) Further, in this embodiment, the groove 30 having a shape that can accommodate the outer edge 25 is provided on the peripheral surface 31 of the roller 30 over the entire circumference, so that the movement of the roller 30 in the axial direction is limited. The As a result, sliding contact between the side surface 301 of the roller 30 and the side surface 401 of the guide member 40 can be avoided. Thereby, when the roller 30 moves relative to the dynamic vibration absorber main body 22 along the outer edge 25 by the input of torque fluctuation, it is possible to reduce a frictional force that prevents the roller 30 from moving relative to the roller 30. Therefore, the roller 30 can be significantly swung along the outer edge 25, and the damping efficiency of vibration accompanying torque fluctuation can be increased.

The above embodiment may be changed to another embodiment as described below.
-As shown to Fig.6 (a), the structure provided with the disk shaped dynamic vibration absorber main body 122 may be sufficient as a dynamic vibration absorber. In this case, the rolling chamber 123 is configured by a through hole formed in the dynamic vibration absorber main body 122. Even in such a rolling chamber 123, the outer edge 25 includes a first region 51 and a second region 52 located outside the first region 51 in the circumferential direction.

  As shown in FIGS. 6A and 6B, the outer edge 25 of the dynamic vibration absorber main body 122 is provided with a protrusion 61 extending along the outer edge 25 at the center in the axial direction. Also good. In this case, the circumferential surface 31 of the roller 30 may be provided with an annular groove 62 that can engage the protrusion 61 over the entire circumference. Thereby, the movement of the roller 30 in the axial direction is limited. That is, the protruding portion 61 and the groove portion 62 constitute a “restricting means”.

  Further, the height dimension H1 of the protrusion 61 may be shorter than the depth dimension H2 of the groove 62. When such a configuration is adopted, the tip of the protrusion 61 does not contact the bottom surface of the groove 62. As a result, the roller 30 abuts on the dynamic vibration absorber body 122 at a portion having a large diameter, while the roller 30 does not contact the dynamic vibration absorber body 122 at a portion having a small diameter. By adopting such a configuration, the dynamic vibration absorber main body at the time of movement along the outer edge 25 of the roller 30 as compared with the case where a plurality of portions having different diameters contact the dynamic vibration absorber main body 122 in the roller 30. Slip of the roller 30 with respect to 122 can be suppressed. That is, the force accompanying the relative movement of the roller 30 can be efficiently transmitted to the dynamic vibration absorber main body 122. Therefore, it is possible to increase the damping efficiency of vibration accompanying torque fluctuation.

In another embodiment shown in FIG. 6, the height dimension H <b> 1 of the protrusion 61 may be longer than the depth dimension H <b> 2 of the groove 62.
As shown in FIGS. 7A and 7B, an annular ridge 66 is provided over the entire circumference in the center of the peripheral surface 31 of the roller 30 in the axial direction, and You may provide the groove part 67 which can accommodate the protrusion part 66. FIG. In this case, the protruding portion 66 and the groove portion 67 constitute a “restricting means”. And you may make the height dimension H3 of the protrusion part 66 longer than the depth dimension H4 of the groove part 67. FIG.

8A and 8B, the height dimension H3 of the ridge 66 may be shorter than the depth dimension H4 of the groove 67.
The roller 30 may be configured to gradually increase in thickness toward the inner side in the axial direction, and the outer edge 25 may have a shape corresponding to the peripheral surface of the roller 30.

  For example, as shown in FIGS. 9A and 9B, the roller 30 is configured such that the cross-sectional shape of the peripheral surface 131 is tapered, and the outer edge 25 is opposed to the peripheral surface 131 of the roller 30. It is good also as a shape.

  Further, as shown in FIGS. 10A and 10B, the roller 30 is configured so that the cross-sectional shape of the peripheral surface 131 forms an arc shape, and the outer edge 25 is opposed to the peripheral surface 131 of the roller 30. It is good also as a shape.

Even if comprised in this way, the movement to the axial direction of the roller 30 can be restrict | limited. In this case, the circumferential surface 131 and the outer edge 25 of the roller 30 constitute a “limiter”.
The roller 30 may be configured so as to become gradually thinner toward the inner side in the axial direction, and the outer edge 25 may have a shape corresponding to the peripheral surface of the roller 30.

  As shown in FIGS. 11A and 11B, the guide member 40 may be provided with a contact portion 70 that contacts the tip of the shaft portion 33 of the roller 30. Accordingly, a state in which a gap is interposed between the side surface 301 of the roller 30 and the side surface 401 of the guide member 40 is maintained. In this case, the contact portion 70 functions as a “limiter”.

The outer edge may have a configuration in which the second region 52 is provided only on one side in the circumferential direction of the first region 51.
-You may comprise the 2nd area | region 52 so that a 2nd curvature radius may become the same value as a 1st curvature radius.

  In addition, if the second radius of curvature is smaller than the third radius of curvature, the second region 52 may be configured so that the second radius of curvature is larger than the first radius of curvature. Even if comprised in this way, the width | variety in the circumferential direction of the rolling chamber 23 can be narrowed compared with the dynamic vibration damper of a comparative example. As a result, the interval between the rolling chambers 23 adjacent to each other in the circumferential direction can be widened, and a roller having a large diameter, that is, a roller having a heavy weight can be used. In this case, it becomes possible to increase the damping efficiency of vibration accompanying torque fluctuation.

  DESCRIPTION OF SYMBOLS 21 ... Dynamic vibration absorber, 22, 122 ... Dynamic vibration absorber main body, 23, 123 ... Rolling chamber, 25 ... Outer edge part (radially outer edge part) which comprises a limiting means, 30 ... Roller as a rolling element, DESCRIPTION OF SYMBOLS 301 ... Side surface, 31 ... Circumferential surface, 32 ... Groove part which comprises a limiting means, 33 ... Shaft part, 40 ... Guide member as a supporting member, 401 ... Side surface, 51 ... 1st area | region, 52 ... 2nd area | region, 61 ... a ridge part constituting the restriction means, 62 ... a groove part constituting the restriction means, 66 ... a ridge part constituting the restriction means, 67 ... a groove part constituting the restriction means, 70 ... a contact part as the restriction means, 131: Peripheral surface constituting limiting means, C: Center of gravity, P1: Outermost position, S: Axis.

Claims (11)

A dynamic vibration absorber body that rotates about a predetermined axis and has a plurality of rolling chambers along the circumferential direction is provided, and the rolling chamber can roll along a radially outer edge. In a dynamic vibration absorber that accommodates various rolling elements,
The radially outer edge is
A first region in which the radius of curvature gradually increases as the outermost position located on the outermost side in the radial direction is the center in the circumferential direction and the distance from the outermost position is increased in the circumferential direction;
A second region that is continuous with the outer circumferential portion of the first region and is formed with a smaller radius of curvature than that of the outer portion of the first region. . When the outermost radius of curvature of the first region is a first radius of curvature and the radius of curvature of the second region is a second radius of curvature, the second radius of curvature is the first radius of curvature. The dynamic vibration absorber according to claim 1, wherein the dynamic vibration absorber is not more than a curvature radius. The dynamic vibration absorber according to claim 1 or 2, wherein the second regions are respectively provided on both sides in the circumferential direction of the first region. The said 1st area | region is formed so that the movement locus | trajectory of the gravity center of the said rolling element which moves along the said 1st area | region may become a catenary curve shape. Dynamic vibration absorber. The rolling element is provided with a pair of shaft portions protruding on both sides in the axial direction,
A pair of support members that are disposed on both sides in the axial direction of the dynamic vibration absorber body and support the rolling element so as to roll freely via the shaft portion;
The dynamic vibration absorber according to any one of claims 1 to 4, further comprising a limiting unit that limits movement of the rolling element in an axial direction. The limiting means is
A ridge provided on the radially outer edge along the extending direction of the edge,
A groove having a width wider than the width in the axial direction of the protrusion, and provided over the entire circumference of the peripheral surface of the rolling element,
The dynamic vibration absorber according to claim 5, wherein a depth dimension of the groove part is made longer than a height dimension of the protrusion part. The width in the axial direction of the rolling element is wider than the width in the axial direction of the dynamic vibration absorber body,
The dynamic vibration absorber according to claim 5, wherein the limiting means includes a groove having a width wider than a width in the axial direction of the dynamic vibration absorber main body while being provided over the entire circumference of the rolling element. vessel. The limiting means is
An annular ridge provided over the entire circumference of the circumferential surface of the rolling element;
The outer edge of the radial direction is provided along the direction in which the edge extends, and includes a groove having a width wider than the width in the axial direction of the ridge.
The dynamic vibration absorber according to claim 5, wherein a depth dimension of the groove portion is made shorter than a height dimension of the protruding portion. The limiting means is
An annular ridge provided over the entire circumference of the circumferential surface of the rolling element;
The outer edge of the radial direction is provided along the direction in which the edge extends, and includes a groove having a width wider than the width in the axial direction of the ridge.
The dynamic vibration absorber according to claim 5, wherein a depth dimension of the groove part is made longer than a height dimension of the protrusion part. The rolling element is configured to gradually become thicker or thinner as it goes inward in the axial direction, and the radially outer edge has a shape corresponding to the circumferential surface of the rolling element,
The dynamic vibration absorber according to claim 5, wherein the limiting means is configured by a peripheral surface of the rolling element and an edge portion on the radially outer side. The restricting means is provided on both the support members and includes an abutting portion with which the tip of the shaft portion abuts with a gap interposed between a side surface of the supporting member and a side surface of the rolling element. The dynamic vibration absorber according to claim 5.