JP2009236225A - Dynamic damper device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper device having an adequate vibration absorbing effect on a member whose vibration frequency is changed. <P>SOLUTION: The dynamic damper device 1 comprises a mount member 10 to be mounted on a vibration absorbed member 4 whose vibration frequency is changed, a mass member 20 isolated from the mount member 10, an elastic body 30 elastically connecting the mount member 10 to the mass member 20, a gravity center variable actuator 22 for changing a gravity center G1 of the mass member 30, and a control part 3 for controlling the gravity center variable actuator 22 in accordance with the vibration frequency of the vibration absorbed member 4 and the vibration frequency of a vibration generating source which imparts vibration to the vibration absorbed member 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dynamic damper device including a dynamic damper main body to which a mass member is attached via an elastic body.

  The resonance frequency of the dynamic damper is uniquely determined by the shape and mass of the mass member, the shape of the elastic body, and the spring constant. As a characteristic of the dynamic damper, high vibration proof performance is exhibited against vibration at the resonance frequency of the dynamic damper, but vibration may be worsened in a frequency band deviated from the resonance frequency. Accordingly, it is important to determine the shape of the mass member so that the resonance frequency of the dynamic damper is surely adapted to the frequency of the vibration isolation target corresponding to the attachment site.

However, many dynamic dampers so far have not been able to change the resonance frequency. Therefore, once determined, the design change could not be accommodated. With respect to this problem, a dynamic damper capable of changing the resonance frequency is described in Japanese Patent No. 2662108 (Patent Document 1).
Japanese Patent No. 2662108

  However, the dynamic damper described in Patent Document 1 can only change the resonance frequency at the time of initial setting. Therefore, it is effective as long as the vibration isolation frequency in the vibration isolation target member is always constant, but it cannot be applied to a member whose vibration frequency changes. That is, when the vibration frequency of the vibration isolation target member deviates from the set resonance frequency of the dynamic damper, there is a possibility that the vibration is also deteriorated.

  This invention is made | formed in view of such a situation, and it aims at providing the dynamic damper apparatus which can exhibit the vibration isolating effect appropriately with respect to the member from which a vibration frequency changes.

  Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.

(Means 1) A dynamic damper device according to means 1 comprises:
An attachment member attached to a vibration isolation target member whose vibration frequency changes;
A mass member spaced apart from the mounting member;
An elastic body for elastically connecting the mounting member and the mass member;
An actuator for changing the center of gravity of the mass member;
A control unit that controls the actuator for varying the center of gravity based on a vibration frequency of the vibration isolation target member or a vibration frequency of a vibration generation source that applies vibration to the vibration isolation target member;
It is characterized by providing.

  Here, when the center of gravity of the mass member changes, the resonance frequency of the dynamic damper main body constituted by the mass member and the elastic body changes. That is, according to this means, the resonance frequency of the dynamic damper main body can be freely changed by the control unit. Therefore, when the vibration frequency of the vibration isolation target member changes, the resonance frequency of the dynamic damper main body can be matched with the vibration frequency. As a result, even if the vibration frequency of the vibration isolation target member changes, the vibration of the vibration isolation target member can be reliably suppressed.

(Means 2) In the dynamic damper device of means 1, the elastic body may be subjected to shear deformation when the vibration isolation target member vibrates.
According to the means 2, the resonance frequency of the dynamic damper main body can be reliably varied by changing the center of gravity of the mass member.

(Means 3) In the dynamic damper device of Means 1 or 2, the direction connecting the center of gravity of the mass member and the elastic center of the elastic body is set to be different from the vibration direction of the vibration isolation target member. Good.
According to the means 3, the resonance frequency of the dynamic damper main body can be reliably varied.

(Means 4) In the dynamic damper device according to any one of the means 1 to 3, the center-of-gravity varying actuator may constitute a part of the mass member.
According to the means 4, the mass of the center-of-gravity variable actuator itself can be used effectively.

(Means 5) In the dynamic damper device according to any one of means 1 to 4, the mass member may include a fixed member attached to the elastic body and a movable member movable relative to the fixed member.
According to the means 5, the center of gravity of the mass member can be reliably varied by changing the relative position of the movable member with respect to the fixed member.

(Means 6) In the dynamic damper device of means 5, the mass member may include a guide member that is provided on the fixed member and guides the movement of the movable member relative to the fixed member.
According to the means 6, the movement of the movable member can be restricted only in the direction guided by the guide member. Accordingly, the center of gravity of the mass member can be moved to the target position.

(Means 7) In the dynamic damper device of means 5 or 6, the mass member may include a protective cover that is provided on the fixed member and covers the movable member.
According to the means 7, it can prevent that a foreign material and water penetrate | invade into the site | part which a movable member moves with respect to a fixed member. Furthermore, the protective cover also functions as a mass member. That is, the mass of the protective cover itself can be used effectively.

(Means 8) In the dynamic damper device of any one of means 1 to 7, the center-of-gravity varying actuator may be a positionable motor.
According to the means 8, it can be performed reliably and easily. In addition, as this motor, the linear stepping motor etc. which can move a shaft member to an axial direction are suitable.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of a dynamic damper device according to the invention will be described with reference to the drawings.

<First embodiment>
A dynamic damper device 1 according to a first embodiment will be described with reference to FIGS. FIG. 1 is a configuration diagram of a dynamic damper device 1 according to the first embodiment. 2 is a cross-sectional view taken along the line AA in FIG. FIGS. 3A to 3C are cross-sectional views taken along line BB in FIG. 2, and are state diagrams in which the position of the movable member 23 of the mass member 20 is changed.

  Here, in the present embodiment, consider a case where the vibration-proof target member 4 vibrates in the vertical direction in FIG. The vibration isolation target member 4 is a member whose vibration frequency changes. The vibration isolation target member 4 is, for example, a torque rod that connects the vehicle engine and the vehicle body, a subframe that supports the engine, an exhaust pipe, a transmission, and the like. These are members that vibrate mainly due to engine vibration. That is, the vibration generating source that applies vibration to the vibration isolation target member is an engine or the like.

  As shown in FIG. 1, the dynamic damper device 1 includes a dynamic damper main body 100, a vibration sensor 2, and a control unit 3. The dynamic damper main body 100 includes a mounting member 10, a mass member 20, and an elastic body 30.

  The attachment member 10 is formed of a rectangular flat plate and is attached to the vibration isolation target member 4 with a plurality of bolts 5. The mass members 20 are arranged apart from each other in the normal direction of the mounting member 10 (the left-right direction in FIG. 1). The elastic body 30 is elastically connected between the mounting member 10 and the mass member 20. That is, when the vibration isolation target member 4 vibrates in the vertical direction in FIG. 1, the elastic body 30 undergoes shear deformation.

  Details of the mass member 20 will be described below. The mass member 20 includes a fixing member 21, an actuator 22 for changing the center of gravity, a variable member 23, a guide member 24, and a protective cover 25.

  It is formed in the bottomed rectangular frame shape provided with the fixing member 21 and a recessed part. The outer surface of the bottom portion of the fixing member 21 is bonded to the elastic body 30. That is, the opening of the fixing member 21 opens in the normal direction of the mounting member 10.

  The center-of-gravity varying actuator 22 is an actuator that changes the center of gravity G1 of the mass member 20. The center-of-gravity variable actuator 22 is a linear stepping motor, and is housed in a recess of the fixing member 21 and fixed to the fixing member 21. The linear stepping motor includes a stator 22a around which a coil is wound and a through hole, and is disposed in the through hole of the stator 22a. The linear stepping motor is movable in the axial direction with respect to the stator 22a by supplying current to the coil. It is a motor provided with the rod 22b. Specifically, the rod 22b can be positioned in the axial direction with respect to the stator 22a based on the current supplied to the coil. And the stator 22a is being fixed to the fixing member 21 so that the rod 22b of a linear stepping motor can move to the normal direction (left-right direction of FIG. 1) of the attachment member 10 with respect to the stator 22a.

  The movable member 23 has a rectangular parallelepiped shape and is connected to the rod 22b. That is, the movable member 23 is provided so as to be movable relative to the fixed member 21 in the normal direction of the mounting member 10. That is, when the movable member 23 moves with respect to the fixed member 21, the center of gravity G1 of the entire mass member 20 changes. In the present embodiment, as shown in FIGS. 3A to 3C, the center of gravity G <b> 1 of the mass member 20 changes in the normal direction of the mounting member 10. That is, no matter where the movable member 23 is located, the direction connecting the center of gravity G1 of the mass member 20 and the elastic center G2 of the elastic body 30 is set to be different from the vibration direction of the vibration isolation target member 4. Yes. Furthermore, two guide holes are formed in the movable member 23.

  The guide member 24 has a flat plate shape or a rod shape. Two guide members 24 are fixedly provided on the fixing member 21 such that each guide member 24 extends in the normal direction of the mounting member 10. Specifically, one end of each of the two guide members 24 is fixed to the right end surface of the stator 22a of the center-of-gravity varying actuator 22 in FIG. In the present embodiment, two flat guide members 24 are provided substantially in parallel so that the rod 22b is located in the middle. The guide member 24 is inserted into the guide hole of the movable member 23 so as to be slidable. That is, the guide member 24 guides the movement of the movable member 23 relative to the fixed member 21. Therefore, the movable member 23 can be reliably moved in a fixed direction with respect to the fixed member 21.

  The protective cover 25 is attached to the outer peripheral surface of the opening side of the fixed member 21 and covers the movable member 23 and the guide member 24. The protective cover 25 is made of resin, rubber or the like. The protective cover 25 can prevent foreign matter and water from entering the inside.

  The vibration sensor 2 is attached to the vibration isolation target member 4 and detects the vibration frequency of the vibration isolation target member 4. Here, the vibration sensor 2 is attached to the vibration isolation target member 4 itself, but may be attached to a position where the vibration frequency of a vibration generation source that applies vibration to the vibration isolation target member 4 can be detected.

  Based on the vibration frequency detected by the vibration sensor 2, the control unit 3 controls the linear stepping motor that is the center-of-gravity varying actuator 22. Specifically, the center of gravity G1 of the mass member 20 is changed so that the resonance frequency of the dynamic damper main body 100 matches the vibration frequency of the vibration isolation target member 4.

  Here, when the center of gravity G1 of the mass member 20 is changed, a change in the resonance frequency of the dynamic damper main body 100 will be described with reference to FIGS. 3 (a) to 3 (c) and FIG. FIG. 4 shows the frequency characteristics of the dynamic damper body 100, and (a), (b), and (c) correspond to FIGS. 3 (a), (b), and (c), respectively.

  As shown in FIG. 3A, when the movable member 23 is at the position closest to the bottom surface of the fixed member 21, that is, when the center of gravity G1 of the mass member 20 is closest to the elastic center G2 of the elastic body 30, The resonance frequency of the dynamic damper main body 100 is increased. As shown in FIG. 3B, when the movable member 23 is moved to a position away from the bottom surface of the fixed member 21 as compared with the state of FIG. 3A, that is, the center of gravity G1 of the mass member 20 is an elastic body. When moving to a position away from the elastic center G2 of 30, the resonance frequency of the dynamic damper main body 100 decreases. Furthermore, as shown in FIG. 3C, when the movable member 23 is moved further away from the bottom surface of the fixed member 21 than in the state of FIG. 3B, that is, the center of gravity G1 of the mass member 20 Is moved further away from the elastic center G2 of the elastic body 30, the resonance frequency of the dynamic damper main body 100 is further reduced.

  Thus, the resonance frequency of the dynamic damper main body 100 changes according to the relative position of the movable member 23 with respect to the fixed member 21. The relative position of the movable member 23 is determined by controlling the current supplied to the coil wound around the stator 22a of the center-of-gravity varying actuator 22. That is, the control unit 3 can change the resonance frequency of the dynamic damper main body 100 by controlling the current supplied to the coil. And by making the resonance frequency of the dynamic damper main body 100 coincide with the vibration frequency of the vibration isolation target member 4, it is possible to always exhibit a high vibration isolation effect for the vibration isolation target member 4 whose vibration frequency changes.

  In addition to the fixed member 21 and the movable member 23, the center-of-gravity varying actuator 22, the guide member 24, and the protective cover 25 also constitute the mass member 20. Therefore, the masses of the center-of-gravity varying actuator 22, the guide member 24, and the protective cover 25 can be effectively used.

<Second embodiment>
A dynamic damper main body 200 according to the second embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view showing the dynamic damper main body 200 of the second embodiment. In the dynamic damper main body 200 of the second embodiment, the same components as those of the dynamic damper main body 100 of the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The dynamic damper main body 200 includes the attachment member 10, the mass member 220, and the elastic body 30. The mass member 220 includes a fixing member 221, an actuator 222 for changing the center of gravity, a variable member 23, a guide member 24, and a protective cover 225.

  The fixing member 221 is formed in a rectangular plate shape, and one surface of the fixing member 221 is bonded to the elastic body 30. The center-of-gravity varying actuator 222 is a linear stepping motor, as in the first embodiment. The stator of the center-of-gravity varying actuator 222 is fixed to various surfaces of the fixing member 221 with bolts. The protective cover 225 has the same shape as the protective cover 25 of the first embodiment, and is attached to the outer peripheral surface of the center-of-gravity varying actuator 222.

  Even when the dynamic damper main body 200 configured as described above is applied, the same effects as those of the first embodiment can be obtained.

<Third embodiment>
A dynamic damper main body 300 according to a third embodiment will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a dynamic damper main body 300 of the third embodiment. In the dynamic damper main body 300 of the third embodiment, the same components as those of the dynamic damper main body 100 of the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  The dynamic damper main body 300 includes the attachment member 10, the mass member 320, and the elastic body 30. The mass member 320 includes a fixed member 321, an actuator 22 for changing the center of gravity, and a variable member 23. That is, the dynamic damper body 300 of the third embodiment is different from the dynamic damper body 100 of the first embodiment in that the shape of the fixing member 321 is different and the guide member 24 and the protective cover 25 are not provided. .

  The fixing member 321 is formed in a bottomed rectangular frame shape having a recess. The outer surface of the bottom of the fixing member 321 is bonded to the elastic body 30. That is, the opening of the fixing member 321 opens in the normal direction of the mounting member 10. Further, when the movable member 23 moves relative to the fixed member 321, the outer surface of the movable member 23 slides on the inner peripheral surface of the fixed member 321. That is, the inner peripheral surface of the fixed member 321 exhibits the guide function of the movable member 23. Further, even when the movable member 23 is at the position farthest from the bottom surface of the fixed member 321, the movable member 23 is in contact with the inner peripheral surface of the fixed member 321. Therefore, the inside of the fixing member 321 is always isolated from the fixing member 321. That is, foreign matter and water can be prevented from entering the area where the stator 22a and the rod 22b are disposed.

  Moreover, since the other structure is the same as that of 1st embodiment, when the dynamic damper main body 300 of this embodiment is applied, there exists an effect similar to 1st embodiment.

<Fourth embodiment>
A dynamic damper main body 400 according to a fourth embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a dynamic damper main body 400 of the fourth embodiment. The dynamic damper body 400 of the fourth embodiment differs from the dynamic damper body 300 of the third embodiment in the direction in which the center of gravity G1 of the mass member 420 changes. Specifically, the configuration of the mass member 420 is the same as the configuration of the mass member 320 of the third embodiment, but the outside of the side surface of the fixing member 321 constituting the mass member 420 is bonded to the elastic body 30 instead of the bottom surface. Has been. Accordingly, the movable member 23 moves in a direction parallel to the attachment member 10 with respect to the fixed member 321 in a state where the vibration isolation target member 4 is not vibrating.

  Here, in this embodiment, in all the states in which the movable member 23 is moved with respect to the fixed member 321, the direction connecting the center of gravity G1 of the mass member 420 and the elastic center G2 of the elastic body 30 is as shown in FIG. It is set so as to be different from the horizontal direction and the vertical direction of FIG. Therefore, even if the vibration isolation target member 4 vibrates in the vertical direction in FIG. 7 or in the horizontal direction in FIG. 7, even if the vibration frequency of the vibration isolation target member 4 changes. Proper anti-vibration effect can be demonstrated.

<Others>
In the above embodiment, the control unit 3 controls the center-of-gravity variable actuator using the vibration sensor 2, but the present invention is not limited to this. For example, when the vibration source is an engine or the like, the control unit 3 can control the actuator for varying the center of gravity based on information from a controller that controls the engine.

It is a block diagram of the dynamic damper apparatus 1 of 1st embodiment. It is AA sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line B-B in FIG. The frequency characteristic of the dynamic damper main body 100 is shown, (a) (b) (c) respond | corresponds to Fig.3 (a) (b) (c), respectively. It is sectional drawing which shows the dynamic damper main body 200 of 2nd embodiment. It is sectional drawing which shows the dynamic damper main body 300 of 3rd embodiment. It is sectional drawing which shows the dynamic damper main body 400 of 4th embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Dynamic damper apparatus, 2: Vibration sensor, 3: Control part, 4: Anti-vibration object member 100,200,300,400: Dynamic damper main body 10: Mounting member 20,220,320,420: Mass member 21,221 , 321: fixed member, 22 and 222: actuator for changing center of gravity 22a: stator, 22b: rod 23: movable member, 24: guide member, 25 and 225: protective cover 30: elastic body

Claims (8)

An attachment member attached to a vibration isolation target member whose vibration frequency changes;
A mass member spaced apart from the mounting member;
An elastic body for elastically connecting the mounting member and the mass member;
An actuator for changing the center of gravity of the mass member;
A control unit that controls the actuator for varying the center of gravity based on a vibration frequency of the vibration isolation target member or a vibration frequency of a vibration generation source that applies vibration to the vibration isolation target member;
A dynamic damper device comprising:   The dynamic damper device according to claim 1, wherein the elastic body undergoes shear deformation when the vibration isolation target member vibrates.   The dynamic damper device according to claim 1 or 2, wherein a direction connecting a center of gravity of the mass member and an elastic center of the elastic body is set to be different from a vibration direction of the vibration isolation target member.   The dynamic damper device according to claim 1, wherein the center-of-gravity varying actuator constitutes a part of the mass member.   5. The dynamic damper device according to claim 1, wherein the mass member includes a fixed member attached to the elastic body and a movable member movable relative to the fixed member.   The dynamic damper device according to claim 5, wherein the mass member includes a guide member that is provided on the fixed member and guides the movement of the movable member with respect to the fixed member.   The dynamic damper device according to claim 5, wherein the mass member includes a protective cover that is provided on the fixed member and covers the movable member.   The dynamic damper device according to claim 1, wherein the center-of-gravity varying actuator is a positionable motor.

Images