JP2017096395A - Vibration reduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration reduction device capable of improving dustproofness and waterproofness of a housing.SOLUTION: A vibration reduction device includes a first cover member 12 attached to one side surface 10a of a rotor 10, and a second cover member 13 attached to the other side surface 10b of the rotor 10. The first cover member 12 and the second cover member 13 respectively have outer peripheral side tongue piece parts 26, 28 extending outward in a radial direction of the rotor 10 with respect to a region where a rolling body 17 reciprocates, and inner peripheral side tongue piece parts 27, 29 extending inward in the radial direction with respect to the region. The first cover member 12 and the second cover member 13 respectively fastens the outer peripheral side tongue piece parts 26, 28 to the one side surface 10a, and the inner peripheral side tongue piece parts 27, 29 to the other side surface 10b. Coupling rigidity of the two cover members 12, 13 is enhanced to set a resonance frequency higher than a primary frequency band of an engine.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration reducing apparatus for reducing torsional vibration, and more particularly to a vibration reducing apparatus in which a rotating body capable of rotating relative to the rotating body is accommodated in a rotating body that receives torque and rotates. It is.

  2. Description of the Related Art Conventionally, there has been known a vibration reducing device in which an inertial mass body is configured as a rolling element, and the rolling element reciprocates along a rolling surface formed on the rotating body to reduce torsional vibration of the rotating body. (For example, refer to Patent Document 1). For example, a vibration reducing device uses a resilient damper that reduces the vibration of torque output from a power source by utilizing the elastic action of a spring and a pendulum damper provided on a rotating body on the output side of the resilient damper. It is configured to reduce and transmit fluctuations in torque output from the source.

  The pendulum damper is disposed, for example, inside the torque converter, and the rolling element and the rolling surface are sealed or sealed in a watertight manner by the housing so that the reciprocating motion of the rolling element is not hindered by the hydraulic pressure in the torque converter. Has been. The housing is composed of, for example, an annular input side plate disposed on the engine side and an annular output side plate disposed on the turbine runner side, for example. The input side plate and the output side plate are rotated by receiving torque generated by the engine. A center plate is disposed between the input side plate and the output side plate. The center plate is provided to be rotatable relative to the input side plate and the output side plate via a spring that functions as an elastic damper. The input side plate and the output side plate are provided with a receiving portion that is formed by bending the cross section into a “U” shape with the open side facing the inner peripheral side. The center plate holds a rolling element for a pendulum damper that reciprocates in the rotation direction due to a change in torque. The input side plate and the output side plate are connected to the center plate in such a manner that the accommodating portion covers the region where the rolling element reciprocates so as not to contact the rolling element.

International Publication No. 2013/128590

  By the way, the rotating body that transmits the driving force output from the power source, such as the center plate, inevitably vibrates due to input torque fluctuation, load fluctuation, friction, or the like. The frequency of vibration changes according to the number of rotations, and higher-order vibrations higher than the secondary vibrations are also generated. Therefore, the amplitude increases due to resonance, which causes noise and durability reduction.

  The vibration reducing device has a configuration in which the input side plate and the output side plate constituting the housing are connected to one plate and bent into a U-shaped cross section, that is, a bag shape. In such a configuration, it has been found that the low-order rotation of the housing generated during rotation, for example, the vibration frequency of the primary component occurs in a relatively low frequency region. For this reason, if the resonance frequency of the housing is included in the low-order rotation order of the engine, for example, the vibration frequency region of the primary component, the vibration transmissibility is amplified at the resonance frequency of the housing. If it becomes like this, the vibration from an engine will be easily transmitted to a housing, and there exists a possibility that the dustproofness and waterproofness of a housing may be impaired.

  The present invention has been made by paying attention to the above technical problem, and an object of the present invention is to provide a vibration reducing device capable of improving the dustproof and waterproof properties of the housing.

  In order to solve the above-described problems, the present invention is configured such that a rotating body for vibration damping that reciprocates in the rotation direction of the rotating body due to the fluctuation of the torque is held on the rotating body that receives torque and rotates. In the vibration reduction apparatus in which a cover that covers a region where the moving body reciprocates so as not to contact the rolling body is attached to the rotating body, the cover includes a first cover member attached to one side surface of the rotating body; A second cover member attached to the other side surface of the rotating body, wherein the first cover member and the second cover member are arranged in a radial direction of the rotating body from the region in which the rolling element reciprocates. An outer peripheral tongue piece extending outward, and an inner peripheral tongue piece extending inward in the radial direction of the rotating body from the region where the rolling element reciprocates, the first cover member and the Second cover part Is attached to the rotating body in a state of covering the region by fastening the outer peripheral side tongue piece to the one side surface and the inner peripheral side tongue piece portion to the other side surface. is there.

  According to the present invention, the first cover member and the second cover member that cover the area where the rolling element held by the rotating body rolls are formed on the outer peripheral side tongue piece portion extending outward from the area and the inner side extending inward. A tongue piece, and a first cover member and a second cover member are fastened to the rotating body using the outer tongue piece and the inner tongue piece. As a result, the connection rigidity of the first cover member and the second cover member with respect to the rotating body is increased, and the resonance frequency of the first cover member and the second cover member when the rotating body is rotated is set to the low order of rotation of the engine, for example, the first order. It can be set higher than the frequency region of the component. For this reason, the dust-proof property and waterproofness of a 1st cover member and a 2nd cover member can be improved.

It is sectional drawing which shows an example of the pendulum damper used for the vibration reduction apparatus which concerns on this invention, and has fastened the rotary body and the cover member with the bolt nut fastening body. It is a side view which shows the principal part of the pendulum damper demonstrated in FIG. It is sectional drawing which shows the other example of the pendulum damper used for the vibration reduction apparatus which concerns on this invention, and has fastened the rotary body and the cover member with the rivet. It is a side view which shows the principal part of the pendulum damper demonstrated in FIG. It is sectional drawing which shows an example of the vibration reduction apparatus which concerns on this invention. It is sectional drawing which shows the other example of the vibration reduction apparatus which concerns on this invention.

  Hereinafter, an example of the vibration reducing apparatus according to the present invention will be described. FIG. 1 shows an example of a pendulum damper 9 used in a vibration reducing device. The vibration reducing device using the pendulum damper 9 is, for example, the inside of a torque converter or between a power source, for example, an engine output shaft and an input shaft such as a transmission, or in a hybrid vehicle, an engine output shaft and a motor / generator. Between the rotary shafts of the two.

  As shown in FIG. 1, the rotating body 10 that constitutes the pendulum damper 9 receives, for example, torque output from the engine and rotates about the rotating shaft 11. A first cover member 12 formed in an annular shape is attached to one side surface 10a of the rotating body 10, and a second cover formed in an annular shape on the other side surface 10b opposite to the one side surface. A member 13 is attached. That is, the first cover member 12 and the second cover member 13 are attached so as to sandwich the rotating body 10. The first cover member 12 is formed with an annular first recess 14 that is recessed by one step. The second cover member 13 is formed with an annular second recess 15 that is recessed by one step. Since the 1st recessed part 14 and the 2nd recessed part 15 function as what is called a rib, even if plate | board thickness is thin, the rigidity of the 1st cover member 12 and the 2nd cover member 13 can be improved.

  A plurality of insertion holes 16 are formed in the rotating body 10 at predetermined intervals in the circumferential direction, and a rolling element 17 is inserted into each insertion hole 16. In order to prevent the rolling element 17 from being detached from the insertion hole 16, the outer diameters of both end portions 18 and 19 are formed larger than the width of the insertion hole 16. In other words, the intermediate shaft portion 20 formed with a diameter smaller than the outer diameter of the both end portions 18 and 19 of the rolling element 17 is inserted into the insertion hole 16. The rolling element 17 is reciprocated through the insertion hole 16 in accordance with the torsional vibration of the rotating body 10.

In the insertion hole 16, the inner wall surface 21 on the outer peripheral side is formed in an arc shape, for example, and the rolling element 17 rolls along the inner wall surface 21. That is, the rolling element 17 is inserted into the insertion hole 16 so as to rotate in the same direction as the rotation of the rotating body 10 and to rotate relative to the rotating body 10. As for the shape of the inner wall surface 21, the inner wall surface 21 is formed so that the rolling element 17 rolls according to the order of the torque vibration input into the rotary body 10, for example. That is, the square root of a value obtained by dividing the distance R from the center of rotation of the rolling element 17 to the center of rotation of the rotating body 10 by the distance L from the center of gravity of the rolling element 17 to the center of rotation of the rolling element 17. However, the inner wall surface 21 of the insertion hole 16 formed in the rotating body 10 is formed so as to be the order n of the torque vibration input to the rotating body 10. The relationship is shown in the following equation.
n = √ (R / L)

  In addition, if the inner wall surface 21 of the insertion hole 16 is formed so that the vibration order in which the rolling element 17 rolls and the vibration order in which vibration is reduced by rolling the rolling element 17 coincide with each other. Therefore, the shape of the wall surface facing the inner wall surface 21 is not particularly limited. Further, the shape of the rolling element 17 is not limited to the shape having the intermediate shaft portion 20 as described above. For example, the rolling element 17 can be configured to roll along the inner wall surface 21 in the insertion hole 16. It only has to be done. Furthermore, the rolling element 17 rolls along the inner wall surface 21. For this reason, in order to improve the lubricity between the rolling element 17 and the inner wall surface 21, the surface of the rolling element 17 may be coated with resin, and the outer peripheral surface of the rolling element 17 or the inner wall surface 21 of the insertion hole 16 is greased. May be applied.

  The 1st cover member 12 and the 2nd cover member 13 are attached to the rotary body 10 in the direction where the 1st recessed part 14 and the 2nd recessed part 15 oppose. The first recess 14 and the second recess 15 constitute an accommodation portion 23 that accommodates the insertion hole 16 and the rolling element 17. The accommodating portion 23 is provided in an annular shape and covers an area where the plurality of rolling elements 17 reciprocate so as not to contact the rolling elements 17.

  By the way, when the vibration reducing device is used in, for example, a torque converter, the torque converter is filled with oil, and the rolling elements 17 constituting the pendulum damper 9 are immersed in the oil. Therefore, when the rolling element 17 receives the viscous resistance of the oil, the vibration order of the rolling element 17 may change, and the vibration reduction effect may be reduced. Therefore, the first cover member 12 and the second cover member 13 function as a housing 25 in order to keep the inside of the housing portion 23 in a dry state, that is, a state where no lubricating oil is supplied. The housing 25 is an example of a cover.

  In addition, although the 1st cover member 12 and the 2nd cover member 13 which comprise the housing 25 are each demonstrated as single, it is not restricted to this, For example, you may be comprised by multiple. For example, a plurality of first cover members that individually cover the respective regions where the rolling elements 17 roll are fastened to one side surface 10a of the rotating body 10, and a plurality of second cover members are formed in the same or similar manner to the one side surface 10a. The housing 25 may be configured by fastening the cover member to the other side surface 10b.

  The first cover member 12 includes an outer peripheral tongue piece 26 that extends outward in the radial direction of the rotating body 10 from the region in which the rolling element 17 reciprocates, and an inner peripheral tongue that extends inward in the radial direction from the region. One piece 27 is provided integrally. The second cover member 13 integrally includes an outer peripheral tongue piece 28 extending outward in the radial direction from the region and an inner peripheral tongue piece 29 extending inward in the radial direction from the region. ing. The outer peripheral side tongue pieces 26 and 28 and the inner peripheral side tongue pieces 27 and 29 function as attachment allowances for attachment to the rotating body 10. Each of the outer peripheral side tongue pieces 26, 28 and the inner peripheral side tongue pieces 27, 29 is a belt-like tongue piece provided continuously connected in the circumferential direction of the rotating body 10, or partially provided. A plurality of formed tongue pieces.

  Through holes 30 and 31 are formed in the outer peripheral side tongue pieces 26 and 28, respectively. A through hole 32 is formed in the rotating body 10 at a position corresponding to the through holes 30 and 31. Through holes 33 and 34 are formed in the inner peripheral tongue pieces 27 and 29, respectively. A through hole 35 is formed in the rotating body 10 at a position corresponding to the through holes 33 and 34.

  A fastening member, for example, a bolt and nut fastening body 36 is attached to the through holes 30 to 32 on the outer peripheral side. A bolt and nut fastening body 37 is attached to the through holes 33 to 35 on the inner peripheral side. In the bolt and nut fastening bodies 36 and 37, for example, a bolt 38 is inserted along one direction from the through holes 30 and 33 of the first cover member 12 toward the through holes 31 and 34 of the second cover member 13, and the nut 39 is inserted. It is fastened to the screw portion of the bolt 38 from the other direction opposite to the one direction. As a result, the first cover member 12, the rotating body 10, and the second cover member 13 can be viewed from both sides in the axial direction of the bolt 38 at two positions on the outer peripheral side and the inner peripheral side in the radial direction with respect to the housing portion 23. In a pressed state, that is, in a state where a compressive force is applied, they are connected and rotated together. In addition, if the space | interval in the radial direction of two positions fastened with the bolt nut fastening bodies 36 and 37 is shortened, since connection rigidity will become higher, the vibration of the housing 25 can further be reduced.

  FIG. 2 is a side view of the pendulum damper 9 described in FIG. 1 as viewed from the second cover member 13 side. As shown in FIG. 2, the bolt-nut fastening body 36 on the outer peripheral side is constituted by a plurality of bolt-nut fastening bodies 36 a, 36 b... Provided at predetermined intervals in the circumferential direction. The inner periphery side bolt and nut fastening body 37 is configured by a plurality of bolt and nut fastening bodies 37a, 37b,... Provided at predetermined intervals in the circumferential direction. In addition, if the space | interval in the circumferential direction of two positions fastened with the bolt nut fastening bodies 36 and 37 is shortened, since connection rigidity becomes higher, the vibration of the housing 25 can further be reduced.

  As described above, in the pendulum damper 9 described with reference to FIGS. 1 and 2, the positions to be fastened by the bolt and nut fastening bodies 36 and 37 are set at two locations on the outer peripheral side and the inner peripheral side with the accommodating portion 23 interposed therebetween and in the circumferential direction. Are provided at predetermined intervals. For this reason, compared with what was demonstrated by the prior art, the connection rigidity of the housing 25 is improved and the resonant frequency of the housing 25 can be set higher than the engine low rotation order, for example, the frequency range of a primary component. . Thereby, the dustproofness and waterproofness of the housing 25 can be improved.

  FIG. 3 shows another example of the pendulum damper used in the vibration reducing device of the present invention. As shown in FIG. 3, the first cover member 12 and the second cover member 13 constituting the pendulum damper 40 are the same as or similar to those described in FIG. Single pieces 27 and 29 are provided. The outer peripheral side tongue pieces 26 and 28 are fastened to the rotating body 10 by fastening members, for example, rivets 41. The inner peripheral tongue pieces 27 and 29 are fastened to the rotating body 10 by rivets 42. The rivet 41 includes a head portion and a body portion without a screw portion. The rivet 41 is inserted into the through holes 30 to 32 on the outer peripheral side from one direction of the axial direction, for example, and is crimped with a dedicated tool. The rotating body 10 and the outer peripheral side tongue pieces 26 and 28 are fastened by plastically deforming the portions. Further, the rivet 42 is inserted into the through holes 33 to 35 on the inner peripheral side in the same or similar manner as the fastening of the rivet 41, and fastens the rotating body 10 and the inner peripheral tongue pieces 27 and 29. Thereby, the 1st cover member 12, the rotary body 10, and the 2nd cover member 13 are connected in the state pressed from both the axial directions of the rivets 41 and 42, ie, the state in which the compression force acted, and rotate integrally. To do. In FIG. 3, the same members as those described in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted here.

  FIG. 4 is a side view of the pendulum damper 40 described in FIG. 3 as viewed from the second cover member 13 side. As shown in FIG. 4, the outer rivet 41 includes a plurality of rivets 41a, 41b,... The inner rivet 42 includes a plurality of rivets 42a, 42b,... Provided at predetermined intervals in the circumferential direction. Thereby, the vibration reduction apparatus using the pendulum damper 40 can increase the connection rigidity of the housing 25. Thereby, the resonance frequency of the housing 25 can be set higher than the rotational order of the engine, for example, the frequency region of the primary component, and thus the dustproof and waterproof properties of the housing 25 can be improved.

  FIG. 5 shows another example of the vibration reducing apparatus 50 according to the present invention. As shown in FIG. 5, the vibration reducing device 50 is attached, for example, inside the torque converter, and includes an elastic damper 51 and a pendulum damper 52. The elastic damper 51 includes a flywheel 53, a primary side plate 54, a first secondary side plate 55, a second secondary side plate 56, a hub 57, and an elastic member 58. For example, vibration of torque output by the engine Is reduced by utilizing the elastic action of the elastic member 58. For example, a spring is used as the elastic member 58.

  The flywheel 53 is connected to an output shaft 59 of the engine, for example, and rotates around the rotation shaft 60 of the output shaft 59 when, for example, torque output from the engine is input. The hub 57 is spline-coupled to, for example, an output shaft 62 that serves as an input shaft of the transmission, and is provided so as to be rotatable about a rotation center shaft 63 of the output shaft 62. The rotation center axis 63 is set coaxially with the rotation axis 60. The primary side plate 54 is provided so as to be rotatable relative to the hub 57, is connected to the flywheel 53 on the outer peripheral side, and is rotated integrally with the flywheel 53. The first secondary plate 55 and the second secondary plate 56 are disposed with a predetermined gap on both sides of the primary plate 54, and the inner peripheral side is connected to the hub 57 so as to be integrated with the hub 57. Rotated.

  The elastic member 58 is engaged with the primary side plate 54, the first secondary side plate 55, and the second secondary side plate 56. Engagement locations are provided at a plurality of locations in the circumferential direction with respect to the primary side plate 54, the first secondary side plate 55, and the second secondary side plate 56. For example, when a spring is used as the elastic member 58, the primary side plate 54 is rotated when the rotational speed of the primary side plate 54 increases or decreases with respect to the first secondary side plate 55 and the second secondary side plate 56. And the first secondary plate 55 and the second secondary plate 56 are arranged so that the spring is compressed in the circumferential direction.

  The pendulum damper 52 includes a first cover member 12, a second cover member 13, a rotating body 10, a rolling element 17, an outer rivet 69, and an inner rivet 70, and includes a first secondary plate 55 and a second rivet 70. 2 to the secondary side plate 56. In FIG. 5, members that are the same as or similar to the members described in FIG. 3 are given the same reference numerals, and detailed descriptions thereof are omitted here. The first cover member 12 and the second cover member 13 are disposed on both sides of the rotating body 10, and the first recess 14 and the second recess 15 constitute an accommodating portion 23 that accommodates the insertion hole 16 and the rolling element 17. . The rivet 69 on the outer peripheral side includes the second cover member 13, the rotating body 10, the first cover member 12, the spacer 72, the second secondary plate 56, and the first secondary plate 55 as a first member to be fastened. And compressive force along the axial direction is applied to the first member to be fastened. The spacer 72 is inserted between the first cover member 12 and the second secondary plate 56, and maintains a constant distance therebetween. A plurality of outer rivets 69 are provided at predetermined intervals in the circumferential direction.

  The primary plate 54 is formed with a long hole 73 extending in the circumferential direction so as to allow the outer rivet 69 to escape so that the compressive force of the outer rivet 69 does not act. The length of the long hole 73 in the circumferential direction is a length that allows relative rotation between the primary side plate 54, the first secondary side plate 55, and the second secondary side plate 56. The inner rivet 70 fastens the first cover member 12, the rotating body 10 and the second cover member 13 as a second fastened member, and applies a compressive force along the axial direction to the second fastened member. Give. A plurality of inner rivets 70 are provided for each angle corresponding to the interval between the outer rivets 69 in the circumferential direction.

  For example, when the output shaft 59 rotates by the driving force output from the engine, the flywheel 53 rotates. The primary side plate 54 rotates integrally with the flywheel 53 by the rotation of the flywheel 53. Further, when the elastic member 58 rotates together with the primary side plate 54, the first secondary plate 55 and the second secondary plate 56 engaged with the elastic member 58 rotate together with the hub 57. . As a result, the driving force input to the flywheel 53 is transmitted to the output shaft 62 coupled to the hub 57. In the power transmission path during this time, the torque output from the engine is fluctuated by the elastic member 58 interposed between the primary side plate 54, the first secondary side plate 55, and the second secondary side plate 56. Absorbed.

  Further, a pendulum damper 52 is attached to the first secondary plate 55 and the second secondary plate 56 which are output members of the elastic damper 51. The pendulum damper 52 reduces the torque vibration of the rotating member that rotates integrally with the first secondary plate 55 and the second secondary plate 56 as the rolling element 17 rolls. In addition, as a rotary body member, the rotary body which comprises the transmission connected with the output shaft 59, the flywheel 53, the primary side plate 54, the output shaft 62, and the output shaft 62 is included, for example.

  In the embodiment described with reference to FIG. 5, the rivet 41 for fixing the first secondary plate 55 and the second secondary plate 56 can be used together with the rivet 41 on the outer peripheral side. Become. The first cover member 12, the rotating body 10, and the second cover member 13 are fastened to the first secondary plate 55 and the second secondary plate 56 by rivets 69 on the outer peripheral side. For this reason, the centering operation | work of the 1st cover member 12, the rotary body 10, and the 2nd cover member 13 with respect to the 1st secondary side plate 55 and the 2nd secondary side plate 56 can be performed easily.

  FIG. 6 shows another example of the vibration reducing apparatus 80 according to the present invention. As shown in FIG. 6, in the vibration reducing device 80, compared to the vibration reducing device 50 described in FIG. 5, the first fastening member is fastened to the housing portion 23 by the inner peripheral rivet 81. The rivet 81 on the circumferential side gives a compressive force to the first member to be fastened. Further, the second fastened member is fastened by the bolt and nut fastening body 82 on the outer peripheral side with respect to the housing portion 23, and the bolt and nut fastened body 82 on the outer peripheral side exerts a compressive force on the second fastened member. Has been granted. In FIG. 6, members that are the same as or similar to those described in FIG. 5 are given the same reference numerals, and detailed descriptions thereof are omitted here.

  A pendulum damper 52 is integrally attached to the first secondary plate 55 and the second secondary plate 56 which are output members of the elastic damper 51 by rivets 81 on the inner peripheral side. The pendulum damper 52 reduces torque vibration transmitted from the rotating member that rotates integrally with the first secondary plate 55 and the second secondary plate 56 by the rolling element 17 rolling. Let In addition, as a rotary body member, the transmission connected with the output shaft 59, the flywheel 53, the primary side plate 54, the output shaft 62, and the output shaft 62 is included, for example.

  In the embodiment described with reference to FIG. 6, the rivet for fixing the first secondary plate 55 and the second secondary plate 56 can be used together with the rivet 81 on the inner peripheral side. It becomes. Further, the first cover member 12, the rotating body 10, and the second cover member 13 are fastened to the first secondary plate 55 and the second secondary plate 56 by rivets 81 on the inner peripheral side. For this reason, the centering operation | work of the 1st cover member 12, the rotary body 10, and the 2nd cover member 13 with respect to the 1st secondary side plate 55 and the 2nd secondary side plate 56 can be performed easily.

  Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications are made without departing from the spirit of the present invention. For example, in each of the above-described embodiments, the first secondary plate 55, the second secondary plate 56, the first cover member 12, the rotating body 10, and the second cover member 13 are connected to the bolt and nut fastening body 36, 37, 82 and rivets 41, 42, 69, 70, 81 and other fastening members. However, in this invention, it is not restricted to a fastening member, For example, you may fasten by spot welding instead of a fastening member. Further, the vibration reducing device according to the present invention may be used for a fluid transmission device or a fluid coupling other than a torque converter having a torque amplifying action.

  DESCRIPTION OF SYMBOLS 9,40 ... Pendulum damper, 10 ... Rotating body, 17 ... Rolling body, 12, 13 ... Cover member, 25-30 ... Through-hole, 26, 28 ... Outer peripheral side tongue piece part, 27, 29 ... Inner peripheral side tongue piece 50, 80 ... vibration reducing device.

Claims (1)

A rotating body for damping vibration that reciprocates in the rotation direction of the rotating body due to fluctuations in the torque is held on the rotating body that receives torque, and a region in which the rolling body reciprocates does not come into contact with the rolling element. In the vibration reducing device in which the cover that covers the rotating body is attached to the rotating body,
The cover includes a first cover member attached to one side surface of the rotating body, and a second cover member attached to the other side surface of the rotating body,
The first cover member and the second cover member include an outer peripheral tongue piece extending outward in the radial direction of the rotating body from the region in which the rolling element reciprocates, and the region in which the rolling element reciprocates. An inner peripheral tongue piece extending inward in the radial direction of the rotating body,
The first cover member and the second cover member cover the region by fastening the outer peripheral tongue piece to the one side surface and the inner peripheral tongue piece portion to the other side surface, respectively. The vibration reducing device is attached to the rotating body.

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