JP5149773B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a dynamic damper that is attached to a vibrating body and suppresses the vibration.

  Conventionally, for example, an additional vibration system is attached to a vibration generation source such as an automobile engine, an engine mount, a suspension member such as a suspension member (hereinafter collectively referred to as a vibrating body), and a predetermined frequency range. There is known a dynamic damper which absorbs the vibration of the vibrating body and lowers the vibration level.

  For example, in Patent Document 1, a mass body is disposed in a U-shaped bracket having a bottom plate and a pair of opposing side plates erected on the bottom plate so as to be sandwiched between the side plates, and the mass There is disclosed a dynamic damper in which both sides of a body and each side plate are connected by a rubber connecting body.

When the bottom plate of the dynamic damper is fixed to the vibration generation source, the vibration of the vibrating body acts as a shearing force on the rubber coupling body, which is advantageous for setting the resonance frequency low.
JP 2005-188716 A

  By the way, when a dynamic damper having a mass body connected to a side plate standing on a bottom plate is attached to the vibrating body as in the case of Patent Document 1, a space for arranging the mass body in the vicinity of the vibrating body such as directly above the vibrating body cannot be secured. In many cases, the bottom plate protrudes from the vibrating body into an empty space around the vibrating body, a side plate is erected on the protruding portion, and the mass body is supported on the side plate via an elastic body.

  However, when the dynamic damper is attached to the vibrating body in such a cantilever state, there are the following problems. That is, when the vibration frequency of the vibrating body increases, the bottom plate of the bracket itself vibrates, and the dynamic damper becomes a two-degree-of-freedom vibration system of the mass body and the bracket, which is different from the frequency range originally intended for the dynamic damper. Therefore, it becomes difficult to absorb the vibration of the vibrating body in a target predetermined frequency range.

  When such a phenomenon occurs, it is difficult to move the resonance point formed by the mass body and the bracket to the target frequency range only by tuning, and in order to suppress the vibration of the bottom plate, Although it is conceivable to suppress the vibration of the bottom plate itself by increasing the thickness of the bottom plate, there is a limit to increasing the thickness of the bottom plate in a limited space, and the vibration of the bottom plate cannot be suppressed.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a technique for ensuring vibration damping characteristics even when a dynamic damper is attached to a vibrating body in a cantilever state. There is to do.

  In order to achieve the above object, in the present invention, a reinforcing wall portion is provided on a portion that is fixed to the bracket by being attached to the vibrating body, and a portion that becomes the free side of the bracket is projected from the vibrating body. By connecting, the reinforcing wall portion functions as a rib for the free side portion.

That is, the first invention is a dynamic damper that is attached to a vibrating body and suppresses the vibration, and a fixed portion that is fixed to the vibrating body, and the vibration that is cantilevered from the fixed portion. A bracket having a bottom wall portion projecting to the outside of the body, and a side wall portion erected substantially perpendicular to the bottom wall portion in parallel with the projecting direction of the bottom wall portion, and the bottom wall portion and A mass body connected to each of the side wall portions via a rubber elastic body, and the fixing portion includes a reinforcing wall portion extending in a protruding direction and connected to the side wall portion with respect to the fixing portion. The reinforcing wall portion is erected substantially vertically, and the reinforcing wall portion has a portion non-parallel to the side wall portion.

  According to the first invention, the fixing portion is fixed to the vibrating body to become a fixing side of the bracket, while the bottom wall portion protruding from the fixing portion to the outside of the vibrating body is connected to the free side of the bracket. Become.

  Then, the reinforcing wall portion extending in the overhanging direction is erected substantially perpendicular to the fixed portion, and the reinforcing wall portion is connected to the side wall portion erected substantially perpendicular to the bottom wall portion. The wall portion functions as a rib for increasing the rigidity in the direction perpendicular to the bottom wall portion with respect to the bottom wall portion. Accordingly, even when the dynamic damper is attached to the vibrating body in a cantilever state, the rigidity of the bottom wall portion is increased and the vibration is suppressed.

  In addition, since the reinforcing wall portion has a portion that is not parallel to the side wall portion, the reinforcing wall portion functions as a rib for increasing the rigidity in the direction perpendicular to the side wall portion with respect to the side wall portion. Thereby, the rigidity of the bottom wall part in the direction orthogonal to the side wall part is increased via the side wall part, and the vibration is suppressed.

  As described above, the rigidity of the entire bracket is improved by increasing the rigidity of the bottom wall part and the side wall part, and the dynamic damper approaches a vibration system with one degree of freedom, so that the frequency range different from the target frequency of the dynamic damper is obtained. The appearance of the resonance point can be suppressed. Therefore, even when the dynamic damper is attached to the vibrating body in a cantilever state, the vibration damping characteristics can be ensured.

  According to a second invention, in the first invention, the reinforcing wall portion is connected to an end portion of the side wall portion on the fixed portion side and is viewed from a direction orthogonal to the bottom wall portion. It is characterized by curving so as to swell from the end of the side wall to the opposite side of the mass body in a direction orthogonal to the side wall.

  According to the second invention, since the reinforcing wall portion is connected to the end portion on the fixed portion side in the side wall portion, for example, compared with the case where the reinforcing wall portion is connected on the surface on the side opposite to the mass body in the side wall portion. Thus, the dynamic damper itself can be made compact.

  Further, since the reinforcing wall portion is curved so as to swell to the side opposite to the mass body with respect to the side wall portion, the extending direction and the curved shape are combined, and the side wall portion and the bottom wall portion respectively. The rigidity of the whole bracket in the orthogonal direction can be further increased. Thereby, even when the frequency of the vibrating body is increased, it becomes easier to ensure the vibration damping characteristics of the dynamic damper.

  In a third aspect based on the second aspect, the lower end of the reinforcing wall is connected to the edge of the fixed portion, and the lower end is orthogonal to the side wall as viewed from the overhanging direction. It is characterized by curving so as to swell to the opposite side to the mass body in the direction of the movement.

  In this way, by bending the reinforcing wall portion in two directions, the rigidity of the bracket is further increased, and the vibration damping characteristics of the dynamic damper can be further ensured.

  According to a fourth invention, in any one of the first to third inventions, the reinforcing wall portion is formed integrally with the fixing portion and the side wall portion.

  According to the fourth invention, since the reinforcing wall portion is formed integrally with the fixing portion and the side wall portion, for example, each of these is compared with the case where the reinforcing wall portion is connected to the fixing portion and the side wall portion by welding. A reduction in the cross-sectional performance of the portion can be suppressed. Therefore, it is possible to reliably increase the rigidity of the bracket and suppress the vibration.

  According to the dynamic damper according to the present invention, the reinforcing wall portion having a portion not parallel to the side wall portion standing on the bottom wall portion is erected on the fixed portion, and the reinforcing wall portion is connected to the side wall portion. Since the reinforcing wall portion functions as a rib in the direction perpendicular to the side wall portion and the bottom wall portion, the vibration of the bracket itself in both directions is suppressed, and the vibration damping characteristic is also obtained when the frequency of the vibrating body is increased. Can be secured.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing an engine mount and a dynamic damper disposed above the engine mount. The engine mount 1 is interposed between an engine (not shown) and a vehicle body (not shown), supports a static load of the engine, and absorbs or attenuates vibrations from the engine. It has a function to suppress the transmission of vibration to. The engine mount 1 includes a substantially columnar connecting bracket 11 that is attached to an engine that is a supported body via an engine bracket 13, and a cylindrical supporting bracket 17 that supports the connecting bracket 11 from below via a rubber elastic body 23. And is fixed to a vehicle body frame (not shown) by leg portions 19 and 19 welded in the vehicle front-rear direction on the outer peripheral surface of the support fitting 17 and a vehicle body side bracket 21 extending in the vehicle width direction. Yes. The rubber elastic body 23 has a lower end closed by a diaphragm (not shown), a liquid chamber in which a liquid is sealed is formed, and the liquid chamber is divided into two upper and lower chambers by an orifice board (not shown).

  The engine bracket 13 is made of aluminum die-casting and is formed in a rounded shape as a whole as shown in FIGS. A through hole 13a penetrating in the vertical direction is formed at the outer end of the engine bracket 13 in the vehicle width direction, and the connecting fitting 11 of the engine mount 1 is fitted and attached to the through hole 13a. The engine bracket 13 extends downward from the portion where the through hole 13a is formed toward the inside in the vehicle width direction, and expands forward and rearward in the vehicle front-rear direction as it goes downward.

  The engine bracket 13 is formed with a pair of damper support portions 13b and 13b extending in the vehicle front-rear direction at the center in the vehicle width direction, while the vehicle front-rear is disposed at the inner end in the vehicle width direction. Three engine fixing portions 13d, 13d, and 13d that protrude downward in line with the direction are formed.

  The upper ends of the damper support portions 13b and 13b are formed flat so that a fixing portion 25 (two-dot chain line in FIG. 3B) of the dynamic damper 3 described later is placed horizontally. Further, bolt insertion holes 13c and 13c into which bolts 27 and 27 for fastening the dynamic damper 3 are screwed are formed in the damper support portions 13b and 13b, respectively.

  On the other hand, the upper ends of the engine fixing portions 13d, 13d, and 13d are formed flat so that the engine is placed horizontally. Further, bolt insertion holes 13e, 13e, 13e for inserting engine fastening bolts (not shown) are formed in the engine fixing portions 13d, 13d, 13d, respectively.

  The dynamic damper 3 is attached to the engine bracket (vibrating body) 13 and absorbs the vibration, thereby suppressing engine chain noise. 4 to 7, the dynamic damper 3 includes a metal damper bracket (bracket) 5, a metal mass body 7 supported by the damper bracket 5, and the mass body 7 as a damper. A rubber elastic body 9 connected to the bracket 5 is provided.

  The damper bracket 5 includes a fixing portion 25 fixed to the engine bracket 13, a bottom wall portion 15 flush with the fixing portion 25, and a pair of side wall portions 35, 35 erected on the bottom wall portion 15. And have.

  The fixing portion 25 includes a front-side fixing piece 25a and a rear-side fixing that are bifurcated in the vehicle front-rear direction so as to be along the outer peripheral surface of the coupling bracket 11 of the engine mount 1 (periphery of the through-hole 13a of the engine bracket 13). It has a piece 25b. More specifically, the fixing part 25 is formed in a contour that smoothly connects a semicircular arc along the outer peripheral surface of the connecting metal fitting 11 in the vehicle width direction and two arcs having a smaller diameter than the semicircular arc. Yes.

  Bolt insertion holes 25c and 25d for bolting the fixing portion 25 to the engine bracket 13 are formed in both the fixing pieces 25a and 25b, respectively. The damper bracket 5 is fastened and fixed to the engine bracket 13 by screwing and tightening the bolts 27 and 27 inserted through the bolt insertion holes 25c and 25d into the bolt insertion holes 13c and 13c of the damper support portions 13b and 13b. Is done. The bolt insertion hole 25d on the rear side in the vehicle front-rear direction is a long hole to absorb the tolerance of the bolt insertion holes 13c, 13c formed in the engine bracket 13.

  The bottom wall portion 15 is formed integrally with the fixed portion 25 and has a rectangular plate shape extending in the vehicle front-rear direction. As shown in FIG. 2, the bottom wall portion 15 protrudes from the fixing portion 25 to the outside of the engine bracket 13 (in the vehicle width direction) like a cantilever beam having the fixing portion 25 as a fixing point. .

  The pair of side wall portions 35, 35 includes a front side wall portion 35 a and a rear side wall portion 35 b, and is parallel to (along) the vehicle width direction (the protruding direction of the bottom wall portion 15). It is erected substantially perpendicular to the bottom wall portion 15. More specifically, the front side and rear side wall portions 35a and 35b are formed by bending the extended portions of the bottom wall portion 15 in the vehicle front-rear direction by 90 degrees by R processing, respectively, It extends upward from both ends in the direction. Thereby, as shown in FIG. 6, the damper bracket 5 is formed in a substantially U-shaped cross section in which corner portions are R-processed when viewed from the vehicle width direction.

  The mass body 7 is a metal rectangular parallelepiped extending in the vehicle front-rear direction. The bottom surface of the mass body 7 is on the top surface of the bottom wall portion 15 and the side walls 35a and 35b are opposed to the inner surfaces in the vehicle front-rear direction. Are connected to each other via rubber elastic bodies 9. In other words, the rubber elastic body 9b on the lower side of the mass body 7 is vulcanized and bonded to the bottom surface of the mass body 7 and the upper surface of the bottom wall portion 15, and the rubber elastic bodies 9a on the side of the mass body 7 are provided. 9a is vulcanized and bonded to both end surfaces of the mass body 7 in the vehicle front-rear direction and the inner side surfaces of the side wall portions 35a and 35b.

  In this way, by supporting the mass body 7 with the damper bracket 5 via the rubber elastic body 9, the rubber elastic bodies 9a and 9a are mainly sheared (vertical direction) against vibration in the vertical direction of the engine bracket 13. In the same manner, the bending in the shear direction (horizontal direction) of the rubber elastic body 9b functions as a damper for the horizontal vibration of the engine bracket 13 to attenuate the vibration in each direction. .

  Here, since the dynamic damper 3 is attached to the engine bracket 13 in a cantilever state with the fixing portion 25 as a fixing point, when the vibration frequency of the engine bracket 13 increases, the bottom wall portion 15 itself of the damper bracket 5 vibrates. The dynamic damper 3 becomes a vibration system with two degrees of freedom of the mass body 7 and the damper bracket 5, and a resonance point may appear in a frequency range lower than the frequency range originally intended for the dynamic damper 3 (FIGS. 8 and 8). 9).

  Accordingly, in the dynamic damper 3 of the present invention, the reinforcing wall portions 45 and 45 for improving the rigidity of the damper bracket 5 in particular by increasing the rigidity of the bottom wall portion 15 include the fixing portion 25 and the side wall portions 35a and 35b. It is integrally formed.

  The reinforcing wall portions 45, 45 are composed of a front reinforcing wall portion 45a and a rear reinforcing wall portion 45b in the vehicle front-rear direction, and the front and rear reinforcing wall portions 45a, 45b are arranged in the vehicle width direction (projecting direction). So as to extend substantially vertically and integrally with the front and rear fixing pieces 25a and 25b, respectively, and are integrally connected to the front and rear side wall portions 35a and 35b. And these front side and rear side reinforcement wall parts 45a and 45b have a part (curved part) non-parallel to side wall parts 35a and 35b, respectively.

  More specifically, the front reinforcing wall portion 45a is integrally connected to the end portion on the outer side in the vehicle width direction (fixed portion 25 side) of the front side wall portion 35a, and the outer side in the vehicle width direction (the protruding direction of the bottom wall portion 15). And in the plan view (viewed from the direction orthogonal to the bottom wall portion 15), the front side in the vehicle front-rear direction (side wall portion 35a) from the outer end in the vehicle width direction of the front side wall portion 35a. , 35b in a direction orthogonal to the mass body 7 in a direction perpendicular to the surface 35b. On the other hand, the rear reinforcing wall portion 45b is integrally connected to an end portion on the outer side in the vehicle width direction of the rear side wall portion 35b, extends outward in the vehicle width direction, and has a plan view of the rear side wall portion 35b. It curves so as to swell from the end in the vehicle width direction to the rear side in the vehicle longitudinal direction.

  In this way, by extending the reinforcing wall portions 45a and 45b outward in the vehicle width direction, the reinforcing wall portions 45a and 45b function as ribs for increasing the rigidity in the vertical direction with respect to the bottom wall portion 15, while reinforcing. By bending the wall portions 45a and 45b so as to swell forward and backward in the vehicle longitudinal direction, the reinforcing wall portions 45a and 45b have rigidity in the vehicle longitudinal direction with respect to the bottom wall portion 15 and the side wall portions 35a and 35b. Acts as a rib to raise. Therefore, the rigidity of the bottom wall portion 15 in the vehicle longitudinal direction and the vertical direction is increased, and the rigidity of the damper bracket 5 as a whole is improved. In addition, since the reinforcing wall portions 45a and 45b are curved outward rather than inside the opposing side wall portions 35a and 35b, when the rubber elastic body 9 is vulcanized and molded, the die-cutting operation becomes easy.

  Further, the lower end of the front reinforcing wall 45a is integrally connected to the front edge of the front fixing piece 25a in the front-rear direction of the vehicle, and the lower end of the front reinforcing wall 45a is viewed from the vehicle width direction (the protruding direction of the bottom wall 15). Is curved so as to swell to the front side in the vehicle front-rear direction (the side opposite to the mass body 7 in the direction orthogonal to the front side wall 35a). On the other hand, the lower side of the rear reinforcing wall 45b is integrally connected to the rear edge of the rear fixed piece 25b in the vehicle front-rear direction, and the lower end is rearward in the vehicle front-rear direction when viewed from the vehicle width direction. It is curved so as to swell to the side (the side opposite to the mass body 7 in the direction orthogonal to the rear side wall 35b). Thus, the rigidity of the entire damper bracket 5 is improved by bending the lower end portions of the reinforcing wall portions 45a and 45b to the front and rear sides in the vehicle front-rear direction.

  As described above, in the dynamic damper 3 according to the present invention, the reinforcing wall portions 45a and 45b are integrally formed with the fixing portion 25 and the side wall portions 35a and 35b, so that the dynamic damper 3 is attached to the engine bracket 13 in a cantilever state. Also in this case, the resonance frequency in the vertical direction and the vehicle front-rear direction is improved as shown in FIGS. 8 and 9 as compared with the dynamic damper in which the reinforcing wall portions 45a and 45b are not provided.

  FIG. 8 shows the vibration frequency of the vibrating body (sample mounting base) and the resonance of the dynamic damper obtained by vibrating the dynamic damper attached to the specimen mounting base of the vibrator (not shown) in the horizontal direction. FIG. 9 is a graph schematically showing the relationship with the magnification, and FIG. 9 shows the vibration of the vibrating body obtained by vibrating the dynamic damper attached to the specimen mounting base of the vibration exciter in the vertical direction. It is a graph which shows typically the relationship between a frequency and the acceleration of a dynamic damper. 8 and 9, the broken lines indicate measured values when a dynamic damper without the reinforcing wall portions 45a and 45b is attached to the specimen mounting base in a cantilevered state (hereinafter referred to as a conventional dynamic damper). The solid line shows the measured values when the dynamic damper 3 of the present embodiment is attached to the specimen mounting base in a cantilevered state.

  As shown in FIG. 8, in the conventional dynamic damper, when the vibration frequency is increased to some extent, the bottom wall portion and the side wall portion of the damper bracket vibrate in the horizontal direction, and the dynamic damper has two degrees of freedom between the mass body and the bracket. The two resonance points appear on the high frequency side and the low frequency side of the resonance frequency X originally intended for the dynamic damper 3. That is, the vicinity of the target resonance frequency X is minimized, and it is difficult to absorb the vibration of the vibrating body. In contrast, in the dynamic damper 3 of the present embodiment, horizontal vibrations of the bottom wall portion 15 and the side wall portions 35a and 35b of the damper bracket 5 are suppressed by the reinforcing wall portions 45a and 45b, and the dynamic damper 3 vibrates with one degree of freedom. As a result, a resonance frequency X as intended (as designed) was obtained.

  Further, as shown in FIG. 9, in the conventional dynamic damper, when the vibration frequency is increased to some extent, the bottom wall portion of the damper bracket itself vibrates up and down, so that the resonance in the vertical direction originally intended by the dynamic damper 3 is achieved. A resonance point appeared in a frequency region lower than the frequency Z. On the other hand, in the dynamic damper 3 of the present embodiment, since the reinforcing wall portions 45a and 45b are provided, the vertical vibration of the bottom wall portion 15 of the damper bracket 5 is suppressed, and a desired high resonance frequency Z is obtained. It was confirmed that it was obtained.

-Effect-
According to the present embodiment, the fixing portion 25 becomes the fixing side in the damper bracket 5 by being fixed to the engine bracket 13, while the bottom wall portion 15 protruding from the fixing portion 25 to the outside of the engine bracket 13 is It becomes the free side in the damper bracket 5.

  The reinforcing wall portions 45a and 45b extending in the vehicle width direction are erected substantially perpendicular to the fixed portion 25, and the reinforcing wall portions 45a and 45b are erected substantially perpendicular to the bottom wall portion 15. By connecting with the portions 35a and 35b, the reinforcing wall portions 45a and 45b function as ribs for increasing the rigidity in the vertical direction with respect to the bottom wall portion 15. Thereby, even when the dynamic damper 3 is attached to the engine bracket 13 in a cantilever state, the rigidity of the bottom wall portion 15 is increased, and the vibration is suppressed.

  In addition, since the reinforcing wall portions 45a and 45b have portions that are not parallel to the side wall portions 35a and 35b, the reinforcing wall portions 45a and 45b function as ribs for increasing the rigidity in the vehicle front-rear direction with respect to the side wall portions 35a and 35b. As a result, the rigidity of the bottom wall portion 15 in the vehicle front-rear direction is increased through the side wall portions 35a and 35b, and the vibration is suppressed.

  As described above, the rigidity of the bottom wall portion 15 and the side wall portions 35a and 35b is enhanced, so that the rigidity of the entire damper bracket 5 is improved and the dynamic damper 3 becomes a vibration system with one degree of freedom. It is possible to suppress the appearance of resonance points in a frequency range different from the frequency to be applied. Therefore, even when the dynamic damper 3 is attached to the engine bracket 13 in a cantilever state, the vibration damping characteristics can be ensured.

  Further, since the reinforcing wall portions 45a and 45b are connected to the end portions of the side wall portions 35a and 35b on the outer side in the vehicle width direction, for example, the reinforcing wall portions 45a and 45b may be connected on the front side surface in the vehicle front-rear direction. The dynamic damper 3 itself can be made compact compared to the case where the side wall portion 35b is connected to the rear surface in the vehicle longitudinal direction.

  Further, the front reinforcing wall 45a swells forward in the vehicle front-rear direction with respect to the front side wall 35a, and the rear reinforcing wall 45b swells rearward in the vehicle front-rear direction with respect to the rear side wall 35b. Since each is curved, the extending direction and the curved shape are combined, and the rigidity of the entire damper bracket 5 in the vertical direction and the vehicle longitudinal direction can be further enhanced. Thereby, even when the frequency of the engine bracket 13 becomes high, it becomes easier to ensure the vibration damping characteristics of the dynamic damper 3.

  Further, when viewed from the vehicle width direction, the front reinforcing wall portion 45a is curved so that its lower end portion swells to the front side in the vehicle front-rear direction, and at the edge of the front fixing piece 25a, and the rear reinforcing wall portion 45b is its lower end portion. Are curved so as to swell toward the rear side in the vehicle front-rear direction and are connected to the edge of the rear fixed piece 25b. Thus, by bending the reinforcing wall portions 45a and 45b in two directions, the rigidity of the damper bracket 5 is further increased, and the vibration damping characteristics of the dynamic damper 3 can be further ensured.

  Further, since the reinforcing wall portions 45a and 45b are integrally formed with the fixing portion 25 and the side wall portions 35a and 35b, for example, the reinforcing wall portions 45a and 45b are connected to the fixing portion 25 and the side wall portions 35a and 35b by welding. Compared with the existing one, the deterioration of the cross-sectional performance of each of the portions 25, 35a, and 35b is suppressed. Therefore, the rigidity of the damper bracket 5 can be reliably increased and its vibration can be suppressed.

(Other embodiments)
In the above embodiment, the damper bracket 5 having a U-shaped cross section is used. However, the present invention is not limited to this, and the damper bracket having an L-shaped cross section including the bottom wall portion 15 and the side wall portion 35 standing substantially vertically from one end thereof. 5 may be used.

  Moreover, in the said embodiment, although curved so that the front side reinforcement wall part 45a may swell to the vehicle front-back direction front side and the rear side reinforcement wall part 45b may swell to the vehicle front-back direction rear side, respectively, it is not restricted to this. The reinforcing wall portions 45a and 45b only need to have portions that are not parallel to the side wall portions 35a and 35b. For example, the reinforcing wall portions 45a and 45b extend outward in the vehicle width direction along the side wall portions 35a and 35b and then bend in the vehicle longitudinal direction. The reinforcing wall portions 45a and 45b may be formed as described above, or the reinforcing wall portions 45a and 45b may be formed so as to be inclined forward or rearward in the vehicle front-rear direction as going outward in the vehicle width direction.

  Furthermore, in the said embodiment, although the reinforcement wall parts 45a and 45b were integrally formed with the fixing | fixed part 25 and side wall parts 35a and 35b, it is not restricted to this, For example, the reinforcement wall parts 45a and 45b are fixed part 25 and You may form separately from either one or both of the side wall parts 35a and 35b.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for a dynamic damper or the like that is attached to a vibrating body in a cantilever state.

It is a perspective view which shows the attachment state to the engine bracket of the dynamic damper which concerns on this invention. It is a side view which shows the attachment state to the engine bracket of a dynamic damper. It is a figure which shows an engine bracket, The same figure (a) is a top view, The same figure (b) is arrow sectional drawing of the bb line | wire of the same figure (a). It is a perspective view of a dynamic damper. It is a top view of a dynamic damper. It is a side view of a dynamic damper. It is a bottom view of a dynamic damper. It is a graph which shows typically the relationship between the vibration frequency of the vibrating body in a horizontal direction, and the resonance magnification of a dynamic damper. It is a graph which shows typically the relationship between the vibration frequency of a vibrating body and the acceleration of a dynamic damper in an up-down direction.

3 Dynamic damper 5 Damper bracket (bracket)
7 Mass body 9 Rubber elastic body 13 Engine bracket (vibrating body)
15 bottom wall part 25 fixed part 35a front side wall part 35b rear side wall part 45a front side reinforcing wall part 45b rear side reinforcing wall part

Claims (4)

A dynamic damper that is attached to a vibrating body and suppresses the vibration,
A fixing portion fixed to the vibrating body; a bottom wall portion protruding from the fixing portion to the outside of the vibrating body so as to be in a cantilever state; and the bottom wall in parallel with a protruding direction of the bottom wall portion A bracket having a side wall portion erected substantially perpendicular to the portion;
A mass body connected to each of the bottom wall portion and the side wall portion via a rubber elastic body,
The fixing portion is provided with a reinforcing wall portion extending in the protruding direction and connected to the side wall portion so as to be substantially perpendicular to the fixing portion.
The dynamic damper, wherein the reinforcing wall portion has a portion non-parallel to the side wall portion. The dynamic damper according to claim 1,
The reinforcing wall portion is connected to an end portion of the side wall portion on the fixed portion side, and when viewed from a direction orthogonal to the bottom wall portion, a direction orthogonal to the side wall portion from the end portion of the side wall portion. A dynamic damper characterized in that it is curved so as to swell to the opposite side of the mass body. The dynamic damper according to claim 2,
The reinforcing wall portion has a lower end connected to the edge of the fixed portion, and the lower end portion swells on the opposite side of the mass body in a direction perpendicular to the side wall portion when viewed from the overhanging direction. Dynamic damper characterized by being curved In the dynamic damper as described in any one of Claims 1-3,
The dynamic damper, wherein the reinforcing wall portion is formed integrally with the fixing portion and the side wall portion.

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