JP2010053966A - Dynamic damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper restraining vibration from being amplified by a resonance frequency of three directions of translation while preventing an installation space and costs from being increased. <P>SOLUTION: The dynamic damper forms an inner tubular member 12 in different shapes in X and Y directions so that a clearance between the inner tubular member 12 and a mass member 13 differs in X direction and Y direction differs in magnitude from each other, and forms, on an inner peripheral portion of the mass member 13, a protuberance 15 which extends in peripheral direction and includes an inclined surface 15a on which the protuberance 15 inclines back and forth with respect to Z direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dynamic damper, and more particularly to a dynamic damper that can suppress amplification of vibration due to a resonance frequency of a member to be damped.

  2. Description of the Related Art Conventionally, in order to suppress vibration amplification due to a resonance frequency, a member provided with a dynamic damper on a vibration suppression target member is known. In this dynamic damper, the mass body is elastically supported via the elastic body with respect to the vibration suppression target member, and the natural frequency of the dynamic damper is tuned to the resonance frequency of the vibration suppression target member. Thus, a damping effect is exhibited with respect to vibrations in a specific frequency range. Specifically, the natural frequency of the dynamic damper is tuned by appropriately setting the mass of the mass body and the rigidity (spring constant) of the elastic body.

  By the way, the resonance frequency and the input direction of vibration input from the vibration suppression target member may be variously different. For example, when a torque rod that connects an internal combustion engine mounted on a vehicle such as an automobile and a vehicle body is used as a damping target member, the torque rod is translated in the X, Y, and Z directions orthogonal to each other. Since there are six directions of rigid body resonance in three directions and three directions of rotation around the X axis, around the Y axis, and around the Z axis, it is necessary to suppress amplification of vibration due to a plurality of resonance frequencies.

As a dynamic damper capable of suppressing the amplification of vibration due to a plurality of resonance frequencies in this way, there is one in which the resonance frequencies in the horizontal direction and the vertical direction are made different (for example, see Patent Document 1).
JP-A-9-112533

  However, in such a conventional dynamic damper, it is only possible to suppress resonance in the two translational directions in the horizontal direction and the vertical direction, and the horizontal direction (for example, the X direction) and the vertical direction (for example, the Y direction). In order to suppress resonance in a direction orthogonal to () (for example, the Z direction), a new dynamic damper is required.

  For this reason, the number of parts of the dynamic damper increases, the installation space for the dynamic damper increases, and the cost of the dynamic damper increases due to the necessity of a large number of dynamic dampers. Resulting in.

  The present invention has been made to solve the above-described conventional problems, and can suppress amplification of vibration due to resonance frequencies in three translational directions while preventing an increase in installation space and cost. The purpose is to provide a dynamic damper.

  In order to achieve the above object, the dynamic damper according to the present invention includes (1) an inner cylinder member attached to a vibration suppression target member, and a cylindrical shape provided coaxially with the inner cylinder member around the inner cylinder member. A dynamic damper provided between the mass body and the inner cylinder member and the mass body, and elastically connecting the mass body and the inner cylinder member, the inner cylinder member and the The inner cylinder member or the mass body is placed in the first direction and the second direction so that the gap between the mass bodies is different in the first direction and the second direction orthogonal to the first direction. And is engaged with either the inner peripheral part of the mass body or the outer peripheral part of the elastic body on one of the inner peripheral part of the mass body or the outer peripheral part of the elastic body. A projection portion that forms a first direction and the projection portion. And a material having an inclined surface inclined in the longitudinal direction with respect to a third direction perpendicular to the second direction.

  With this configuration, the inner cylinder member or the mass body is made to have a size different between the first direction and the second direction orthogonal to the first direction so that the gap between the inner cylinder member and the mass body is different. The shape of the elastic body interposed between the inner cylinder member and the mass body is adjusted by adjusting the size of the gap between the inner cylinder member and the mass body. Can have different shapes in the first direction and the second direction. For this reason, the rigidity of the elastic body can be made different between the first direction and the second direction.

  Also, a protrusion that engages either the inner periphery of the mass body or the outer periphery of the elastic body is formed on either the inner periphery of the mass body or the outer periphery of the elastic body. Since it has the inclined surface which inclines in the front-back direction with respect to the 3rd direction orthogonal to the 1st direction and the 2nd direction, when the inclination angle of the inclined surface of a projection part is made small, it is an elastic body to a projection part. The contact area of the elastic body to the protrusion is increased when the contact area of the protrusion is adjusted to reduce the rigidity of the elastic body in the third direction and the inclination angle of the inclined surface of the protrusion is increased. It can be adjusted so as to increase the rigidity of the elastic body in the third direction.

  For this reason, the rigidity of the elastic body, that is, the resonance frequency can be made different in the first direction, the second direction, and the third direction orthogonal to each other, and vibration amplification due to different resonance frequencies in the three translational directions is suppressed. can do. In addition, since a single dynamic damper can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, it is possible to prevent an increase in installation space and cost of the dynamic damper.

  In order to achieve the above object, the dynamic damper according to the present invention includes (2) an inner cylinder member attached to a vibration suppression target member, and a cylindrical shape provided coaxially with the inner cylinder member around the inner cylinder member. And a dynamic damper that is provided between the inner cylinder member and the mass body and elastically connects the mass body and the inner cylinder member. Having a hole facing the inner cylinder member in a second direction orthogonal to the direction of 1, and either the inner peripheral portion of the mass body or the outer peripheral portion of the elastic body, A protrusion that engages with the other of the peripheral part or the outer peripheral part of the elastic body is formed, and the protrusion is front and rear with respect to the first direction and the third direction orthogonal to the second direction. It is comprised from what has the inclined surface which inclines in a direction.

  With this configuration, since the elastic body has a hole facing the inner cylinder member in a second direction orthogonal to the first direction, the inner cylinder member and the mass body can be adjusted by adjusting the size of the hole. The rigidity of the elastic body interposed between the first direction and the second direction can be made different.

  Also, a protrusion that engages either the inner periphery of the mass body or the outer periphery of the elastic body is formed on either the inner periphery of the mass body or the outer periphery of the elastic body. Since it has the inclined surface which inclines in the front-back direction with respect to the 3rd direction orthogonal to the 1st direction and the 2nd direction, when the inclination angle of the inclined surface of a projection part is made small, it is an elastic body to a projection part. The contact area of the elastic body to the protrusion is increased when the contact area of the protrusion is adjusted to reduce the rigidity of the elastic body in the third direction and the inclination angle of the inclined surface of the protrusion is increased. It can be adjusted so as to increase the rigidity of the elastic body in the third direction.

  For this reason, the rigidity of the elastic body, that is, the resonance frequency can be made different in the first direction, the second direction, and the third direction orthogonal to each other, and vibration amplification due to different resonance frequencies in the three translational directions is suppressed. can do. In addition, since a single dynamic damper can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, it is possible to prevent an increase in installation space and cost of the dynamic damper.

  In the dynamic damper according to the above (1) or (2), (3) the thickness of the mass body is different in the first direction and the second direction, and the outer periphery of the elastic body is An engaging portion is provided, and the engaging portion has an inclined surface that engages with the inner peripheral portion of the mass body with respect to the axis around the third direction as the rotation center.

  With this configuration, since the thickness of the mass body is made different in the first direction and the second direction, the mass body rotates around an axis with the first direction and the second direction as the rotation center. Can be adjusted, and the resonance frequencies around the axes with the first direction and the second direction as the rotation center can be made different.

  In addition, an engaging portion is provided on the outer peripheral portion of the elastic body, and the engaging portion has an inclined surface that engages with the inner peripheral portion of the mass body with respect to the axis around the third direction as the rotation center. When the inclination angle of the inclined surface of the portion is reduced, the contact area when the elastic body comes into contact with the mass body is reduced to reduce the rigidity of the elastic body around the axis with the third direction as the center of rotation. When the inclination angle of the inclined surface of the engaging portion is increased, the contact area when the elastic body contacts the mass body is increased, and the elastic body around the axis with the third direction as the rotation center It can be adjusted so as to increase the rigidity. For this reason, the resonance frequency around the axis with the third direction as the rotation center can be adjusted.

  As a result, it is possible to suppress amplification of vibration due to different resonance frequencies in the three translational directions using a single dynamic damper, and it is possible to suppress amplification of vibration due to different resonance frequencies in the three rotation directions.

  ADVANTAGE OF THE INVENTION According to this invention, the dynamic damper which can suppress the amplification of the vibration by the resonant frequency of three translational directions can be provided, preventing installation space and cost increasing.

Hereinafter, embodiments of a dynamic damper according to the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 and FIG. 2 are views showing a first embodiment of a dynamic damper according to the present invention.
First, the configuration will be described.
In FIG. 1, a torque rod 1 elastically connects a power unit 4 and a vehicle body 5 via elastic bodies 2 and 3 provided at both ends in the longitudinal direction. The power unit 4 is an integral part of an engine, which is an internal combustion engine mounted on a vehicle such as an automobile, and a transmission. For example, the power unit 4 is placed horizontally in an FF (front drive / front axle) vehicle.

  In the torque rod 1, cylindrical portions 6 and 7 at both ends in the longitudinal direction are connected via a shaft portion 10, and inner peripheral portions of the cylindrical portions 6 and 7 are connected to an inner cylinder portion 8 via elastic bodies 2 and 3, respectively. The inner cylinder portions 8 and 9 are attached to the power unit 4 and the vehicle body 5 by bolts (not shown).

  Further, the torque rod 1 constitutes a vibration suppression member, and a dynamic damper 11 is attached to the shaft portion 10 of the torque rod 1. The dynamic damper 11 is tuned to resonance frequencies that are input to the torque rod 1 through the power unit 4 in the X direction, the Y direction, and the Z direction, which are orthogonal to each other. It exhibits a damping effect against vibrations in a specific frequency range, and absorbs vibrations input from the power unit 4 to the vehicle body 5.

  As shown in FIG. 2, the dynamic damper 11 includes an inner cylinder member 12 attached to the torque rod 1, and a mass that is a cylindrical mass body provided coaxially with the inner cylinder member 12 around the inner cylinder member 12. A member 13 and a rubber member 14 provided between the inner cylinder member 12 and the mass member 13 and elastically connecting the mass member 13 and the inner cylinder member 12. The outer peripheral part of the inner cylinder member 12 and the inner peripheral part of the mass member 13 are vulcanized and bonded.

  Further, the inner cylinder member 12 is provided with a bolt hole 12a, and the mass member 13 is elastically attached to the torque rod 1 via the rubber member 14 by screwing the bolt into the torque rod 1 through the bolt hole 12a. It is connected to. In FIG. 1, the bolt holes 12 a are illustrated with the bolts omitted.

  On the other hand, the gaps A1 and A2 between the inner cylinder member 12 and the mass member 13 are the first direction, the X direction (the vertical direction of the vehicle), and the second direction perpendicular to the first direction (the vehicle The inner cylinder member 12 is formed in a different shape in the X direction and the Y direction so as to have different sizes.

  That is, the inner cylinder member 12 is formed horizontally so that the gap A1 is longer than the gap A2, and the mass member 13 is formed in a circular shape. For this reason, the rubber member 14 has a longer width in the X direction than a width in the Y direction across the inner cylinder member 12.

  Further, a protrusion 15 is formed on the inner peripheral portion of the mass member 13, and the protrusion 15 extends in the circumferential direction of the mass member 13. Further, a groove portion 16 is formed on the outer peripheral portion of the inner cylinder member 12, and this groove portion 16 extends in the circumferential direction of the inner cylinder member 12 so as to face the protruding portion 15.

  The protrusion 15 and the groove 16 have inclined surfaces 15a and 16a that are inclined in the front-rear direction (Z direction) with respect to the Z direction (vehicle width direction), which is a third direction orthogonal to the X direction and the Y direction. Each has.

  In the present embodiment, when the torque rod 1 vibrates in the X direction, Y direction, and Z direction via the power unit 4, the mass member 13 vibrates via the rubber member 14, so that the X direction, Y direction, and It absorbs vibrations caused by the resonance frequency in the Z direction.

  That is, in the present embodiment, the inner cylinder member 12 is formed in a different shape in the X direction and the Y direction so that the gap between the inner cylinder member 12 and the mass member 13 has different sizes in the X direction and the Y direction. Therefore, by adjusting the size of the gaps A1 and A2 between the inner cylinder member 12 and the mass member 13, the shape of the rubber member 14 interposed between the inner cylinder member 12 and the mass member 13 is changed to the X direction. And different shapes in the Y direction. For this reason, the rigidity of the rubber member 14 can be made different between the X direction and the Y direction.

  In addition, since the protruding portion 15 extending in the circumferential direction is formed on the inner peripheral portion of the mass member 13 and the protruding portion 15 is provided with the inclined surface 15a inclined in the front-rear direction with respect to the Z direction, When the angle of inclination of the inclined surface 15a is reduced, the contact area of the rubber member 14 with the protruding portion 15 is reduced so that the rigidity of the rubber member 14 in the Z direction is reduced, and the inclined surface of the protruding portion 15 is adjusted. When the inclination angle of 15a is increased, the contact area of the rubber member 14 to the protrusion 15 can be increased to adjust the rigidity of the rubber member 14 in the Z direction.

  For this reason, the rigidity of the rubber member 14, that is, the natural frequency can be made different in the X direction, the Y direction, and the Z direction orthogonal to each other, and the amplification of vibration due to the different resonance frequencies in the three translational directions can be suppressed. .

  Further, in the present embodiment, since a single dynamic damper 11 can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, an increase in installation space and cost of the dynamic damper 11 can be prevented. can do.

  Further, in the present embodiment, the protrusion 15 is provided on the inner periphery of the mass member 13, the groove 16 is provided on the outer periphery of the inner cylinder member 12, and the rubber member 14 is sandwiched between the protrusion 15 and the groove 16. Therefore, it is possible to prevent the rubber member 14 from slipping out in the Z direction.

  In the present embodiment, the protrusion 15 is provided on the inner peripheral portion of the mass member 13, but the protrusion is provided on the outer peripheral portion of the rubber member 14, and the inclination angle of the inclined surface of the protrusion is adjusted. Thus, the rigidity of the rubber member 14 may be adjusted.

(Second Embodiment)
FIG. 3 is a diagram showing a second embodiment of the dynamic damper according to the present invention. In the present embodiment, only the configuration of the dynamic damper attached to the torque rod 1 is different, and the other configurations are the same as those in the first embodiment.

  In FIG. 3, the dynamic damper 21 includes an inner cylinder member 22 attached to the torque rod 1, and a mass member 23 that is a cylindrical mass body provided coaxially with the inner cylinder member 22 around the inner cylinder member 22. The rubber member 24 is provided between the inner cylinder member 22 and the mass member 23 and elastically connects the mass member 23 and the inner cylinder member 22. The rubber member 24 includes the inner cylinder The outer peripheral portion of the member 22 and the inner peripheral portion of the mass member 23 are vulcanized and bonded.

  Further, the inner cylinder member 22 is provided with a bolt hole 22a, and the mass member 23 is elastically attached to the torque rod 1 through the rubber member 24 by screwing the bolt into the torque rod 1 through the bolt hole 22a. It is connected to.

  A rubber member 24 as an elastic body provided between the mass member 23 and the inner cylinder member 22 is an X direction (vertical direction of the vehicle) that is a second direction orthogonal to the Y direction (the longitudinal direction of the vehicle) that is the first direction. A hole 24a that faces the inner cylinder member 22 is formed in the direction). Further, the mass member 23 and the inner cylinder member 22 are both formed in a circular shape.

  In addition, a protrusion 25 is formed on the inner peripheral portion of the mass member 23, and the protrusion 25 extends in the circumferential direction of the mass member 23. Further, a groove portion 26 is formed on the outer peripheral portion of the inner cylinder member 22, and this groove portion 26 extends in the circumferential direction of the inner cylinder member 22 so as to face the protruding portion 25.

  The protrusion 25 and the groove 26 have inclined surfaces 25a and 26a inclined in the front-rear direction (Z direction) with respect to the Z direction (vehicle width direction), which is a third direction orthogonal to the X direction and the Y direction. Each has.

  In the present embodiment, the rubber member 24 has a hole 24a facing the inner cylinder member 22 in the X direction, so that the size of the hole 24a is adjusted so that the gap between the inner cylinder member 22 and the mass member 23 is increased. The rigidity of the rubber member 24 interposed between the X direction and the Y direction can be made different.

  Further, the protrusion 25 extending in the circumferential direction is formed on the inner peripheral portion of the mass member 23, and the protrusion 25 is provided with the inclined surface 25a inclined in the front-rear direction with respect to the Z direction. When the angle of inclination of the surface 25a is reduced, the rubber member 24 is adjusted so as to reduce the rigidity of the rubber member 24 in the Z direction by reducing the contact area of the rubber member 24 to the protrusion 25. Can be adjusted to increase the rigidity of the rubber member 24 in the Z direction by increasing the contact area of the rubber member 24 with the protrusion 25.

  For this reason, the rigidity of the rubber member 24, that is, the natural frequency can be made different in the X direction, the Y direction, and the Z direction orthogonal to each other, and the amplification of vibration due to different resonance frequencies in the three translational directions can be suppressed. .

  Further, in the present embodiment, since a single dynamic damper 21 can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, an increase in installation space and cost of the dynamic damper 21 can be prevented. can do.

  In the present embodiment, the protrusion 25 is provided on the inner periphery of the mass member 23. However, the protrusion is provided on the outer periphery of the rubber member 24, and the inclination angle of the inclined surface of the protrusion is adjusted. Thus, the rigidity of the rubber member 24 may be adjusted.

  Moreover, although the hole 24a which opposes on both sides of the inner cylinder member 22 in the X direction of the rubber member 24 is formed, you may form the hole which opposes on both sides of the inner cylinder member 22 in the Y direction of the rubber member 24. .

(Third embodiment)
FIG. 4 is a diagram showing a third embodiment of a dynamic damper according to the present invention. In the present embodiment, only the configuration of the dynamic damper attached to the torque rod 1 is different, and the other configurations are the same as those in the first embodiment.

  On the other hand, the gaps B1 and B2 between the inner cylinder member 32 and the mass member 33 are the first direction X direction (the vertical direction of the vehicle) and the second direction orthogonal to the first direction (the vehicle The mass members 33 are formed in different shapes in the X direction and the Y direction so as to have different sizes.

  That is, the mass member 33 is formed in a vertically long shape so that the gap B1 is longer than the gap B2, and the inner cylinder member 32 is formed in a circular shape. For this reason, the rubber member 34 has a width in the X direction longer than a width in the Y direction across the inner cylinder member 32.

  In addition, a protrusion 35 is formed on the inner peripheral portion of the mass member 33, and the protrusion 35 extends in the circumferential direction of the mass member 33. A groove 36 is formed on the outer peripheral portion of the inner cylinder member 32, and the groove 36 extends in the circumferential direction of the inner cylinder member 32 so as to face the protrusion 35.

  The protrusion 35 and the groove 36 have inclined surfaces 35a and 36a that are inclined in the front-rear direction (Z direction) with respect to the Z direction (vehicle width direction), which is a third direction orthogonal to the X direction and the Y direction. Each has.

  In the present embodiment, the mass member 33 is formed in a different shape in the X direction and the Y direction so that the gap between the inner cylinder member 32 and the mass member 33 has different sizes in the X direction and the Y direction. By adjusting the size of the gaps B1 and B2 between the inner cylinder member 32 and the mass member 33, the shape of the rubber member 34 interposed between the inner cylinder member 32 and the mass member 33 is changed to the X direction and the Y direction. And different shapes. For this reason, the rigidity of the rubber member 34 can be made different between the X direction and the Y direction.

  In addition, since the protruding portion 35 extending in the circumferential direction is formed on the inner peripheral portion of the mass member 33 and the protruding portion 35 is provided with the inclined surface 35a inclined in the front-rear direction with respect to the Z direction, When the inclination angle of the inclined surface 35a is reduced, the contact area of the rubber member 34 with the protruding portion 35 is reduced so that the rigidity of the rubber member 34 in the Z direction is reduced, and the inclined surface of the protruding portion 35 is adjusted. When the inclination angle of 35a is increased, the contact area of the rubber member 34 to the protrusion 35 can be increased to adjust the rigidity of the rubber member 34 in the Z direction.

  For this reason, the rigidity of the rubber member 34, that is, the natural frequency can be made different in the X direction, the Y direction, and the Z direction orthogonal to each other, and vibration amplification due to different resonance frequencies in the three translational directions can be suppressed. .

  Further, in the present embodiment, since a single dynamic damper 31 can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, an increase in installation space and cost of the dynamic damper 31 can be prevented. can do.

  In this embodiment, the protrusion 35 is provided on the inner periphery of the mass member 33. However, the protrusion is provided on the outer periphery of the rubber member 34, and the inclination angle of the inclined surface of the protrusion is adjusted. Thus, the rigidity of the rubber member 34 may be adjusted.

(Fourth embodiment)
5 and 6 are views showing a fourth embodiment of the dynamic damper according to the present invention. In the present embodiment, only the configuration of the dynamic damper attached to the torque rod 1 is different, and the other configurations are the same as those in the first embodiment.

  5 and 6, the dynamic damper 41 includes an inner cylinder member 42 attached to the torque rod 1, and a mass that is a cylindrical mass body provided coaxially with the inner cylinder member 42 around the inner cylinder member 42. A member 43 and a rubber member 44 that is provided between the inner cylinder member 42 and the mass member 43 and elastically connects the mass member 43 and the inner cylinder member 42. The outer peripheral portion of the inner cylinder member 42 and the inner peripheral portion of the mass member 43 are vulcanized and bonded.

  Further, the inner cylinder member 42 is provided with a bolt hole 42 a, and the mass member 43 is elastically attached to the torque rod 1 through the rubber member 44 by screwing the bolt into the torque rod 1 through the bolt hole 42 a. It is connected to.

  On the other hand, the gaps C1 and C2 between the inner cylinder member 42 and the mass member 43 are the first direction X direction (the vertical direction of the vehicle) and the second direction perpendicular to the first direction (the vehicle The inner cylinder member 42 is formed in a different shape in the X direction and the Y direction so as to have different sizes.

  That is, the inner cylinder member 42 is formed horizontally so that the gap C1 is longer than the gap C2. For this reason, the rubber member 44 has a longer width in the X direction than the width in the Y direction with the inner cylinder member 42 interposed therebetween.

  Further, a protrusion 45 is formed on the inner peripheral portion of the mass member 43, and this protrusion 45 extends in the circumferential direction of the mass member 43. A groove 46 is formed on the outer peripheral portion of the inner cylinder member 42, and the groove 46 extends in the circumferential direction of the inner cylinder member 42 so as to face the protrusion 45.

  The protrusion 45 and the groove 46 have inclined surfaces 45a and 46a that are inclined in the front-rear direction (Z direction) with respect to the Z direction (vehicle width direction), which is a third direction orthogonal to the X direction and the Y direction. Each has. Moreover, the thickness of the mass member 43 is different in the X direction and the Y direction, and the thickness C3 of the mass member 43 in the X direction is smaller than the thickness C4 of the Y direction.

  Further, protrusions 47 as engagement parts are provided on the outer peripheral part of the rubber member 44, and the protrusions 47 are provided at equal intervals in the circumferential direction of the rubber member 44. In addition, a groove portion 48 is provided in the inner peripheral portion of the mass member 43, and a protrusion 47 is engaged with the groove portion 48.

  The protrusion 47 has an inclined surface 47a that engages with the groove 48 around the axis about the Z direction as a rotation center, and the groove 48 has an inclined surface 48a having the same inclination angle as the inclined surface 47a. ing. Since the protrusion 45 is provided in the central portion of the mass member 43 in the Z direction, the groove 48 is provided on the inner peripheral portion of the mass member 43 excluding the protrusion 45.

  In the present embodiment, the torque rod 1 via the power unit 4 has an X direction, a Y direction, a Z direction, and an X axis as the rotation center, an Y axis as the rotation center and the Z direction as the rotation center. When the mass member 43 vibrates through the rubber member 44, the X direction, the Y direction, the Z direction, the X direction around the axis, and the Y direction as the rotation center Vibrations due to resonance frequencies around the axis and around the axis about the Z direction are absorbed.

  That is, in the present embodiment, the inner cylinder member 42 is formed in a different shape in the X direction and the Y direction so that the gap between the inner cylinder member 42 and the mass member 43 has different sizes in the X direction and the Y direction. Therefore, the shape of the rubber member 44 interposed between the inner cylinder member 42 and the mass member 43 is adjusted in the X direction by adjusting the size of the gaps C1 and C2 between the inner cylinder member 42 and the mass member 43. And different shapes in the Y direction. For this reason, the rigidity of the rubber member 44, that is, the natural frequency can be made different between the X direction and the Y direction.

  In addition, the protrusion 45 extending in the circumferential direction is formed on the inner peripheral portion of the mass member 43, and the inclined surface 45a inclined in the front-rear direction with respect to the Z direction is provided on the protrusion 45. When the inclination angle of the inclined surface 45a is reduced, the contact area of the rubber member 44 with the protruding portion 45 is reduced to adjust the rigidity of the rubber member 44 in the Z direction, and the inclined surface of the protruding portion 45 is adjusted. When the inclination angle of 45a is increased, the contact area of the rubber member 44 with the protrusion 45 can be increased to increase the rigidity of the rubber member 44 in the Z direction. The natural frequency of the direction can be adjusted.

  Further, since the thickness of the mass member 43 is made different in the X direction and the Y direction, it is possible to adjust the moment of inertia when the mass member 43 rotates around the axis about the X direction and the Y direction. The natural frequency around the axis can be varied with the X direction and the Y direction as rotation centers.

  Further, a protrusion 47 is provided on the outer peripheral portion of the rubber member 44, and the protrusion 47 has an inclined surface 47a that engages with the inner peripheral portion of the mass member 43 with respect to the axis about the Z direction as a rotation center. When the inclination angle of the inclined surface 47a of the portion 47 is reduced, the contact area when the rubber member 44 contacts the mass member 43 is reduced, and the rigidity of the rubber member 44 around the axis with the Z direction as the rotation center is reduced. When the angle of the inclined surface 47a of the projecting portion 47 is adjusted to be small and the inclination angle of the inclined surface 47a is increased, the contact area when the rubber member 44 is in contact with the mass member 43 is increased, and the axis having the Z direction as the rotation center Adjustment can be made to increase the rigidity of the surrounding rubber member 44. For this reason, the natural frequency around the axis about the Z direction can be adjusted.

  As a result, a single dynamic damper 41 can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, and in addition, vibration amplification due to different resonance frequencies in the three rotation directions can be suppressed. It is possible to prevent the installation space and cost of the dynamic damper 41 from increasing.

  In the present embodiment, the protrusion 45 is provided on the inner peripheral portion of the mass member 43, but the protrusion is provided on the outer peripheral portion of the rubber member 44, and the inclination angle of the inclined surface of the protrusion is adjusted. Thus, the rigidity of the rubber member 44 may be adjusted.

(Fifth embodiment)
7 and 8 are views showing a fifth embodiment of a dynamic damper according to the present invention. In the present embodiment, only the configuration of the dynamic damper attached to the torque rod 1 is different, and the other configurations are the same as those in the first embodiment.

  7 and 8, the dynamic damper 51 includes an inner cylinder member 52 attached to the torque rod 1, and a mass that is a cylindrical mass body provided coaxially with the inner cylinder member 52 around the inner cylinder member 52. A member 53, and a rubber member 54 provided between the inner cylinder member 52 and the mass member 53, and elastically connecting the mass member 53 and the inner cylinder member 52. The outer peripheral portion of the inner cylinder member 52 and the inner peripheral portion of the mass member 53 are vulcanized and bonded.

  Further, the inner cylinder member 52 is provided with a bolt hole 52a. When the bolt is screwed into the torque rod 1 through the bolt hole 52a, the mass member 53 is elastically attached to the torque rod 1 via the rubber member 54. It is connected to.

  A rubber member 54 as an elastic body provided between the mass member 53 and the inner cylinder member 52 is an X direction (vertical direction of the vehicle) that is a second direction perpendicular to the Y direction (the longitudinal direction of the vehicle) that is the first direction. In the direction), a hole 54a is formed opposite to the inner cylinder member 52. The inner cylinder member 52 is formed in a circular shape.

  Further, a protrusion 55 is formed on the inner peripheral portion of the mass member 53, and the protrusion 55 extends in the circumferential direction of the mass member 53. In addition, a groove 56 is formed on the outer peripheral portion of the inner cylinder member 52, and the groove 56 extends in the circumferential direction of the inner cylinder member 52 so as to face the protrusion 55.

  The protrusion 55 and the groove 56 have inclined surfaces 55a and 56a inclined in the front-rear direction (Z direction) with respect to the Z direction (vehicle width direction), which is a third direction orthogonal to the X direction and the Y direction. Each has. Further, the thickness of the mass member 53 is different in the X direction and the Y direction, and the thickness C3 of the mass member 53 in the X direction is smaller than the thickness C4 of the Y direction.

  Further, the outer peripheral portion of the rubber member 54 is provided with protruding portions 57 as engaging portions, and the protruding portions 57 are provided at equal intervals in the circumferential direction of the rubber member 54. Further, a groove portion 58 is provided on the inner peripheral portion of the mass member 53, and a projection portion 57 is engaged with the groove portion 58.

  The protrusion 57 has an inclined surface 57a that engages with the groove 58 around the axis about the Z direction as the rotation center, and the groove 58 has an inclined surface 58a having the same inclination angle as the inclined surface 57a. ing. Since the protrusion 55 is provided in the center of the mass member 53 in the Z direction, the groove 58 is provided on the inner peripheral portion of the mass member 53 excluding the protrusion 55.

  In the present embodiment, the rubber member 54 has a hole 54a that is opposed to the inner cylinder member 52 in the X direction. Therefore, by adjusting the size of the hole 54a, the rubber member 54 is positioned between the inner cylinder member 52 and the mass member 53. The rigidity, that is, the natural frequency of the rubber member 54 interposed between the X direction and the Y direction can be made different.

  In addition, since the protruding portion 55 extending in the circumferential direction is formed on the inner peripheral portion of the mass member 53, and the protruding portion 55 is provided with the inclined surface 55a inclined in the front-rear direction with respect to the Z direction, When the inclination angle of the inclined surface 55a is reduced, the rubber member 54 is adjusted so as to reduce the rigidity of the rubber member 54 in the Z direction by reducing the contact area of the rubber member 54 to the protrusion 55. When the inclination angle of 55a is increased, the contact area of the rubber member 54 with the protrusion 55 can be increased to adjust the rigidity of the rubber member 54 in the Z direction. The natural frequency of the direction can be adjusted.

  Further, since the thickness of the mass member 53 is made different in the X direction and the Y direction, it is possible to adjust the moment of inertia when the mass member 43 rotates around the axis about the X direction and the Y direction. It is possible to vary the natural frequency around the axis with the X direction and the Y direction as the rotation centers.

  Further, a protrusion 57 is provided on the outer peripheral portion of the rubber member 54, and the protrusion 57 has an inclined surface 57a that engages with the inner peripheral portion of the mass member 53 with respect to the axis around the Z direction. When the inclination angle of the inclined surface 57a of the portion 57 is reduced, the contact area when the rubber member 54 comes into contact with the mass member 53 is reduced, and the rigidity of the rubber member 54 around the axis with the Z direction as the rotation center is reduced. When the angle of the inclined surface 57a of the protrusion 57 is adjusted to be small and the inclination angle of the inclined surface 57a is increased, the contact area when the rubber member 54 contacts the mass member 53 is increased, and the axis having the Z direction as the rotation center Adjustment can be made to increase the rigidity of the surrounding rubber member 54. For this reason, the natural frequency around the axis about the Z direction can be adjusted.

  As a result, a single dynamic damper 51 can be used to suppress vibration amplification due to different resonance frequencies in the three translational directions, and in addition, vibration amplification due to different resonance frequencies in the three rotation directions can be suppressed. Further, it is possible to prevent the installation space and cost of the dynamic damper 51 from increasing.

  In this embodiment, the protrusion 55 is provided on the inner peripheral portion of the mass member 53. However, the protrusion is provided on the outer peripheral portion of the rubber member 54, and the inclination angle of the inclined surface of the protrusion is adjusted. Thus, the rigidity of the rubber member 54 may be adjusted.

(Sixth embodiment)
9 and 10 are views showing a sixth embodiment of a dynamic damper according to the present invention. In the present embodiment, only the configuration of the dynamic damper attached to the torque rod 1 is different, and the other configurations are the same as those in the first embodiment.

  9 and 10 are views showing a fourth embodiment of a dynamic damper according to the present invention. In the present embodiment, only the configuration of the dynamic damper attached to the torque rod 1 is different, and the other configurations are the same as those in the first embodiment.

  9 and 10, the dynamic damper 61 includes an inner cylinder member 62 attached to the torque rod 1, and a mass that is a cylindrical mass body provided coaxially with the inner cylinder member 62 around the inner cylinder member 62. A member 63; and a rubber member 64 provided between the inner cylinder member 62 and the mass member 63 and elastically connecting the mass member 63 and the inner cylinder member 62. The outer peripheral portion of the inner cylinder member 62 and the inner peripheral portion of the mass member 63 are vulcanized and bonded.

  Further, the inner cylinder member 62 is provided with a bolt hole 62a. When the bolt is screwed into the torque rod 1 through the bolt hole 62a, the mass member 63 is elastically attached to the torque rod 1 via the rubber member 64. It is connected to.

  On the other hand, the gaps D1 and D2 between the inner cylinder member 62 and the mass member 63 are the first direction X direction (the vertical direction of the vehicle) and the second direction perpendicular to the first direction (the vehicle The mass member 63 is formed in a different shape in the X direction and the Y direction so as to have different sizes.

  That is, the mass member 63 is formed in a horizontally long shape so that the gap D1 is shorter than the gap D2, and the inner cylinder member 62 is formed in a circular shape. For this reason, the rubber member 64 has a width in the X direction shorter than a width in the Y direction across the inner cylinder member 62.

  Further, a protrusion 65 is formed on the inner periphery of the mass member 63, and the protrusion 65 extends in the circumferential direction of the mass member 63. Further, a groove portion 66 is formed on the outer peripheral portion of the inner cylinder member 62, and this groove portion 66 extends in the circumferential direction of the inner cylinder member 62 so as to face the protruding portion 65.

  The protrusion 65 and the groove 66 have inclined surfaces 65a and 66a that are inclined in the front-rear direction (Z direction) with respect to the Z direction (vehicle width direction), which is a third direction orthogonal to the X direction and the Y direction. Each has. The thickness of the mass member 63 is different in the X direction and the Y direction, and the thickness D3 of the mass member 63 in the X direction is smaller than the thickness D4 in the Y direction.

  Further, the outer peripheral portion of the rubber member 64 is provided with protrusions 67 as engaging portions, and the protrusions 67 are provided at equal intervals in the circumferential direction of the rubber member 64. Further, a groove portion 68 is provided on the inner peripheral portion of the mass member 63, and a protrusion 67 is engaged with the groove portion 68.

  The protrusion 67 has an inclined surface 67a that engages with the groove 68 around the axis about the Z direction as a rotation center, and the groove 68 has an inclined surface 68a having the same inclination angle as the inclined surface 67a. ing. Since the projection 65 is provided at the center of the mass member 63 in the Z direction, the groove 68 is provided on the inner peripheral portion of the mass member 63 excluding the projection 65.

  In the present embodiment, since the inner cylinder member 62 is formed in a different shape in the X direction and the Y direction so that the gap between the inner cylinder member 62 and the mass member 63 has different sizes in the X direction and the Y direction. By adjusting the size of the gaps D1 and D2 between the inner cylinder member 62 and the mass member 63, the shape of the rubber member 64 interposed between the inner cylinder member 62 and the mass member 63 is changed to the X direction and the Y direction. Different shapes can be used depending on the direction. For this reason, the rigidity of the rubber member 64, that is, the natural frequency can be made different between the X direction and the Y direction.

  In addition, since the protrusion 65 extending in the circumferential direction is formed on the inner peripheral portion of the mass member 63 and the protrusion 65 is provided with the inclined surface 65a inclined in the front-rear direction with respect to the Z direction, When the inclination angle of the inclined surface 65a is reduced, the rubber member 64 is adjusted so as to reduce the rigidity of the rubber member 64 in the Z direction by reducing the contact area of the rubber member 64 with the protrusion 65. When the inclination angle of 65a is increased, the contact area of the rubber member 64 with the protrusion 65 can be increased to increase the rigidity of the rubber member 64 in the Z direction. The natural frequency of the direction can be adjusted.

  Further, since the thickness of the mass member 63 is made different in the X direction and the Y direction, it is possible to adjust the moment of inertia when the mass member 63 rotates around the axis about the X direction and the Y direction. It is possible to vary the natural frequency around the axis with the X direction and the Y direction as the rotation centers.

  In addition, a protrusion 67 is provided on the outer peripheral portion of the rubber member 64, and the protrusion 67 has an inclined surface 67a that engages with the inner peripheral portion of the mass member 63 with respect to the axis around the Z direction. When the inclination angle of the inclined surface 67a of the portion 67 is reduced, the contact area when the rubber member 64 contacts the mass member 63 is reduced, and the rigidity of the rubber member 64 around the axis with the Z direction as the rotation center is reduced. When the angle of the inclined surface 67a of the protrusion 67 is adjusted to be small, the contact area when the rubber member 64 contacts the mass member 63 is increased, and the axis with the Z direction as the rotation center Adjustment can be made to increase the rigidity of the surrounding rubber member 64. For this reason, the natural frequency around the axis about the Z direction can be adjusted.

  As a result, it is possible to suppress vibration amplification due to different resonance frequencies in the three translational directions using the single dynamic damper 61, and it is possible to suppress vibration amplification due to different resonance frequencies in the three rotation directions. It is possible to prevent the installation space and cost of the dynamic damper 61 from increasing.

  In the present embodiment, the protrusion 65 is provided on the inner periphery of the mass member 63, but the protrusion is provided on the outer periphery of the rubber member 64, and the inclination angle of the inclined surface of the protrusion is adjusted. Thus, the rigidity of the rubber member 64 may be adjusted.

  In this embodiment, the dynamic damper is applied to the torque rod as a vibration suppression member, but as the vibration suppression member, at least three translational directions or three translational directions and a rotational direction like a drive shaft of an automobile. You may apply to what vibrates. When the dynamic damper is attached to the drive shaft or the like, the inner cylinder member is attached to the drive shaft so as to surround the drive shaft.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

  As described above, the dynamic damper according to the present invention has an effect of suppressing vibration amplification due to the resonance frequency in the three translational directions while preventing an increase in installation space and cost. This is useful as a dynamic damper or the like that can suppress the amplification of vibration due to the resonance frequency of the target member.

It is a figure showing a 1st embodiment of a dynamic damper concerning the present invention, and is a principal part lineblock diagram of a vehicle which has a torque rod to which a dynamic damper was attached. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the dynamic damper based on this invention, (a) is a front view of a dynamic damper, (b) is side sectional drawing of a dynamic damper. It is a figure which shows 2nd Embodiment of the dynamic damper based on this invention, (a) is a front view of a dynamic damper, (b) is side sectional drawing of a dynamic damper. It is a figure which shows 3rd Embodiment of the dynamic damper based on this invention, (a) is a front view of a dynamic damper, (b) is side sectional drawing of a dynamic damper. It is a figure which shows 4th Embodiment of the dynamic damper which concerns on this invention, and is a front view of a dynamic damper. It is a figure which shows 4th Embodiment of the dynamic damper based on this invention, (a) is AA direction sectional drawing of FIG. 5, (b) is BB direction sectional drawing of FIG. . It is a figure which shows 5th Embodiment of the dynamic damper which concerns on this invention, and is a front view of a dynamic damper. It is a figure which shows 5th Embodiment of the dynamic damper based on this invention, (a) is AA direction sectional drawing of FIG. 7, (b) is BB direction sectional drawing of FIG. . It is a figure which shows 6th Embodiment of the dynamic damper which concerns on this invention, and is a front view of a dynamic damper. It is a figure which shows 6th Embodiment of the dynamic damper based on this invention, (a) is AA direction sectional drawing of FIG. 9, (b) is BB direction sectional drawing of FIG. .

Explanation of symbols

1 Torque rod (member for vibration control)
11, 21, 31, 41, 51, 61 Dynamic damper 12, 22, 32, 42, 52, 62 Inner cylinder member 13, 23, 33, 43, 53, 63 Mass member (mass body)
14, 24, 34, 44, 54, 64 Rubber member (elastic body)
15, 25, 35, 45, 55, 65 Protruding part 24a, 54a Hole 47, 57, 67 Protruding part (engaging part)

Claims (3)

Provided between the inner cylinder member and the mass body, an inner cylinder member attached to the vibration suppression target member, a cylindrical mass body provided coaxially with the inner cylinder member around the inner cylinder member In a dynamic damper comprising an elastic body that elastically connects the mass body and the inner cylinder member,
The inner cylinder member or the mass body is the first cylinder and the mass body so that the gap between the inner cylinder member and the mass body is different in a first direction and a second direction orthogonal to the first direction. And a different shape in the second direction,
A protrusion that engages either the inner periphery of the mass body or the outer periphery of the elastic body is formed on either the inner periphery of the mass body or the outer periphery of the elastic body, and the protrusion The dynamic damper is characterized in that the portion has an inclined surface that inclines in the front-rear direction with respect to the first direction and a third direction orthogonal to the second direction. Provided between the inner cylinder member and the mass body, an inner cylinder member attached to the vibration suppression target member, a cylindrical mass body provided coaxially with the inner cylinder member around the inner cylinder member In a dynamic damper comprising an elastic body that elastically connects the mass body and the inner cylinder member,
The elastic body has a hole facing the inner cylinder member in a second direction orthogonal to the first direction,
A protrusion that engages either the inner periphery of the mass body or the outer periphery of the elastic body is formed on either the inner periphery of the mass body or the outer periphery of the elastic body, and the protrusion The dynamic damper is characterized in that the portion has an inclined surface that inclines in the front-rear direction with respect to the first direction and a third direction orthogonal to the second direction. The thickness of the mass body is made different in the first direction and the second direction, and an engaging portion is provided on an outer peripheral portion of the elastic body, and the engaging portion has the third direction as the rotation center. The dynamic damper according to claim 1, further comprising an inclined surface that engages with an inner peripheral portion of the mass body around the axis.

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