JP5061002B2 - Vibration control device for vehicle - Google Patents

Description

  The present invention relates to a vibration damping device for a vehicle that is attached to a vibration member such as a frame of a vehicle and suppresses vibration of the vibration member by using a damping effect based on sliding friction.

  Conventionally, as a method for reducing vibration at the time of resonance, which is a problem in a vibration member (vibration target member) such as an automobile frame, it is also described in, for example, Japanese Patent Application Laid-Open No. 2004-28124. As described above, a method of disposing a dynamic damper in which a mass member having a predetermined mass is elastically connected to a vibration member by a spring member is generally known.

  By the way, recently, a relatively low-rigidity member may be employed in an automobile for the purpose of absorbing impact force at the time of a collision or reducing the weight of the automobile. In such a low-rigidity member, the natural frequency is small compared to a high-rigidity member that has been conventionally used, and therefore the amplitude at the time of resonance tends to be large. Therefore, the vibration at the time of resonance of the low-rigidity member may be large enough to be felt by the occupant, and it is considered that effective vibration suppression is necessary.

  However, since the vibration to be controlled is a vibration in the low frequency range, if it is intended to achieve the desired damping effect with the dynamic damper of the conventional structure, the spring constant of the spring member is made sufficiently small or the mass member It is necessary to increase the mass of the spring sufficiently, and the durability of the spring member and the increase in the vehicle weight are likely to be problems.

JP 2004-28124 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is a wide range including a low frequency range while preventing a significant increase in the weight of the vehicle. An object of the present invention is to provide a vehicular vibration damping device having a novel structure capable of effectively preventing deterioration of a vibration state due to resonance of a vibration member in a frequency range.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. Further, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or an invention that can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized based on thought.

That is, the present invention is a vibration damping device that is attached to a vibration member of a vehicle, and includes a metal vibration member that is formed in a longitudinal shape along with the vibration member. It comprises a support portion attached to the vibrating member in the longitudinal direction of the intermediate portion of the longitudinal end portions in the vibrating member to the attachment is attached portion and該制vibration member of members, at least one of the mounting portion the vibrating Rutotomoni is relatively sliding displaceably sliding acceptable attachment portion is caused to abut against member, slidingly acceptable support portion to which the support portion is brought into relatively sliding displaceably abut against the vibrating member is, and with sliding portion to said vibration member in該滑dynamic permissible mounting portion and該滑kinematic acceptable support portion is formed of a foamed elastic member having a Young's modulus of 10～1000MPa,該滑dynamic permissible mounting portion and said The foamed elastic body of the dynamic allowable support portion and pressing means are provided to hold the abutment against against the vibrating member, and, together with the vibration member has a hollow cross-section, the hollow interior of the vibrating member The vibration damping member is housed and disposed, and the supporting portion is pressed against one of the opposing surfaces on the inner peripheral surface of the vibration member by utilizing the elastic force of the vibration damping member. The pressing means is configured by pressing the attachment portions at both ends of the vibration member against the other of the opposing surfaces on the inner peripheral surface of the vibration member .

In the vibration damping device having the structure according to the present invention as described above, the elastic member is bent and deformed at the time of vibration input, so that the elastic elastic body of the sliding permissible mounting portion and the sliding permissible support portion brought into contact with the vibration member. However, since the vibration energy is reduced based on the energy loss due to the sliding friction, the intended vibration damping effect can be exhibited. ing. That is, it is possible to obtain a more effective vibration suppression effect by both the damping due to friction between the sliding permissible mounting portion and the vibration member and the damping due to friction between the sliding permissible support portion and the vibration member. . In addition, since the support portion is supported by the vibration member, it is possible to avoid the intermediate portion of the vibration damping member from hitting the vibration member or another member and being damaged. Further, the pressing means is constituted by a damping member, and the pressing means can be realized without providing a special member, and the sliding allowable mounting portion and the sliding allowable support portion are brought into contact with the vibration member. Retained. Therefore, the number of parts of the vibration damping device can be reduced, and the vibration damping device according to the present invention can be realized with a simple structure.

In particular, since the sliding portion (contact portion) of the sliding permissible mounting portion and the sliding permissible support portion with respect to the vibration member is made of a foamed elastic body, the contact area between the foamed elastic body and the vibration member can be reduced. Thus, the sliding displacement of the foamed elastic body with respect to the vibration member can be efficiently expressed. In addition, by adopting a foamed elastic body, even if the abutting portions of the sliding allowance mounting portion and the sliding allowance support portion are worn by friction with the vibration member, the abutting surface is exposed by exposing the internal bubbles to the surface. Thus, it is possible to prevent the contact area between the elastic foam and the vibration member from increasing. Therefore, it is maintained with sliding permissible mounting portion and sliding acceptable support and the vibrating member in stable contact state of interest, therefore, upon input of vibration targeted for damping, for the vibration member of the sliding acceptable support portion The sliding displacement is generated with high accuracy and stability, and the intended vibration damping effect can be obtained efficiently.

Further, example embodiment, the abutment surface elastic foam sliding permissible mounting portion and sliding acceptable support portion is brought into abutment in the vibration member, or a rough surface having large irregularities, has a large strain, When the foamed elastic body is partially brought into contact with the vibration member, the foamed elastic body is partially worn, and as a result, the intended contact state over the entire surface can be expressed. . As a result, errors in the shape of the contact surface of the foamed elastic body with the vibration member and the contact surface of the vibration member with the foamed elastic body are allowed, and the foamed elastic body and the vibration member can be easily manufactured. It becomes.

Furthermore, since the Young's modulus of the foamed elastic body constituting the sliding permissible mounting portion and the sliding permissible support portion is 10 to 1000 MPa, the deformation of the foamed elastic body is sufficiently smaller than that of a general rubber elastic body. Since the sliding displacement with respect to the vibration member is effectively suppressed and deformation of the foamed elastic body is allowed as compared with a non-foamed hard synthetic resin material or the like, the vibration member The contact state with respect to can be stably maintained.

  In the vibration damping device according to the present invention, any of the attachment portions provided at both end portions in the longitudinal direction of the vibration damping member may be the sliding permissible attachment portion.

  As described above, since the mounting portions provided at both end portions in the longitudinal direction of the damping member are the sliding allowable mounting portions, each of the sliding allowable mounting portions becomes the vibrating member at the time of the vibration input in question. On the other hand, it is relatively displaced by sliding. As a result, attenuation due to sliding friction is exhibited at each sliding permissible mounting portion, and a damping effect can be obtained efficiently.

  On the other hand, in the vibration damping device according to the present invention, the attachment portion on one end side in the longitudinal direction of the vibration damping member is a fixed attachment portion fixed to the vibration member, and the length of the vibration damping member is The mounting portion on the other end side in the direction may be the sliding permissible mounting portion that is brought into contact with the vibrating member so as to be slidable.

  As described above, since the attachment portion on one end side in the longitudinal direction of the vibration damping member is a fixed attachment portion fixed to the vibration member, the entire vibration damping device moves relative to the vibration member. Thus, the vibration damping device can be held at the initial mounting position. When the vibration is input to the vibration member, the sliding allowable attachment portion, which is the attachment portion on the other end side in the longitudinal direction of the vibration suppression member, causes a predetermined slip displacement with respect to the vibration member, so that the desired vibration suppression effect is stable. Will be demonstrated.

  Further, the vibration member to which the vibration damping device according to the present invention is attached may be an automobile frame.

  Thus, since the vibration member is an automobile frame, the vibration member is sufficiently large, and bending deformation due to vibration input is greatly caused. Thereby, the sliding displacement between the foamed elastic body and the frame is sufficiently generated, and the intended vibration damping effect is effectively exhibited. In particular, by attaching a vibration damping device to an automobile frame configured by combining longitudinal frame members such as a ladder frame, the intended vibration damping effect can be more effectively exhibited.

  In the vibration damping device according to the present invention, it is desirable that the length of the vibration damping member is 1/10 or more of the free length in the vibration mode direction of the vibration member.

  According to this, the damping member is formed with a sufficient length with respect to the free length in the vibration mode direction of the vibrating member, and the sliding displacement between the foamed elastic body and the vibrating member is highly sensitive due to the bending deformation of the vibrating member. Be born. Therefore, the damping effect due to the sliding friction between the foamed elastic body and the vibration member is effectively exhibited. Note that the vibration mode direction refers to a direction in which the vibration modes of the vibration member continue.

  Further, the vibration damping device according to the present invention includes a plurality of the vibration damping members, and the plurality of vibration damping members are attached to the vibration member so as to extend in different directions. May be.

According to this, even when resonance in a plurality of directions different from each other becomes a problem in the vibration member, the sliding permissible mounting portion and the sliding permissible support attached to each vibration damping member against the resonance phenomenon in each direction. The vibration damping effect based on the sliding friction between the part and the vibration member can be obtained effectively.

  Furthermore, in the vibration damping device according to the present invention, it is preferable that the plurality of vibration damping members are arranged so as to extend in directions intersecting each other on one surface of the vibration member.

  In this way, by providing a plurality of damping members extending in mutually intersecting directions on the same plane, even if resonance in a plurality of different directions becomes a problem in the vibration member, any resonance phenomenon can be detected. Can also obtain an effective damping effect. Further, by arranging the plurality of damping members so as to cross each other, it is possible to realize a compact damping device that exerts an effect in a plurality of vibration mode directions.

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

  First, FIG. 1 shows a vehicle vibration damping device 10 as a first embodiment of the present invention. The vibration damping device 10 is attached to a frame member 12 as a vibration member, and includes a connecting metal fitting 14 as a vibration damping member. In the following description, the vertical direction means the vertical direction in FIG. 1 unless otherwise specified. Moreover, the longitudinal direction of the connection metal fitting 14 means the left-right direction in FIG.

  More specifically, the connection fitting 14 is formed of a thin metal plate (an iron plate in the present embodiment) having a long shape, and has a long and narrow rectangle when viewed in the vertical direction. Further, as shown in FIG. 1, the connecting metal fitting 14 has an intermediate portion in the longitudinal direction (left-right direction in FIG. 1) curved in the thickness direction, and both end portions in the longitudinal direction from the central portion. Is also positioned above. In addition, as for the connection metal fitting 14, it is desirable for the length in the longitudinal direction to be 1/10 or more with respect to the free length of the frame member 12 in the same direction.

  Moreover, the 1st foaming elastic body 16 is attached to the longitudinal direction both ends of the connection metal fitting 14, respectively. The first foamed elastic body 16 is a substantially rectangular foamed elastic body, and is fixed to the upper surface of the connection fitting 14. In the present embodiment, the first foamed elastic body 16 constitutes the attachment portion.

  Further, a second foamed elastic body 18 is attached to a central portion in the longitudinal direction of the connection fitting 14. The second foamed elastic body 18 is a foamed elastic body formed in a substantially rectangular parallelepiped like the first foamed elastic body 16, and is fixed to the lower surface of the connecting metal fitting 14 in the longitudinal center portion. In the present embodiment, the second foamed elastic body 18 constitutes a support portion.

  The first and second foamed elastic bodies 16 and 18 are made of a foam material having elasticity, and are not particularly limited. For example, foamed urethane or foamed rubber may be used as the material. desirable. The Young's modulus of the first and second foamed elastic bodies 16 and 18 is 10 to 1000 MPa, and more preferably 100 to 800 MPa. The first and second foamed elastic bodies 16 and 18 may be closed-cell foams in which bubbles are formed independently of each other, or open-cell foams in which a plurality of bubbles are continuous with each other. It may be the body. Furthermore, the first and second foamed elastic bodies 16 and 18 are formed with a sufficient thickness in order to ensure the durability of the vibration damping device 10 and achieve the stable performance of the desired vibration damping performance. The thickness is preferably 3 mm or more, more preferably 10 mm or more.

  As shown in FIG. 2, the vibration damping device 10 having such a structure is attached to a frame member 12 of an automobile. The frame member 12 is a member constituting a ladder frame or the like of an automobile, and has a structure in which a pair of frame halves 20 and 20 are combined with each other. This half frame 20 has a structure in which a rectangular flat plate-shaped flange portion 22 is protruded from both ends in the width direction of a metal plate having a long rectangular flat plate shape toward one side in the thickness direction. The steel material has a substantially U-shaped cross section as a whole. And the flame | frame member 12 which is a box-type steel material as a whole is comprised when the front-end | tips of the flange parts 22 and 22 of the frame half bodies 20 and 20 are mutually contacted, and are mutually fixed by welding. . In this embodiment, the frame member 12 has a substantially constant square cross section and extends linearly in the length direction.

  And the damping device 10 is arrange | positioned in the length direction approximate center part of the frame member 12 made into such a structure. That is, an opening portion is formed on the side surface of the frame member 12 at a portion where the vibration damping device 10 is mounted, and the vibration damping device 10 is inserted into the inner circumferential space of the frame member 12 from the opening portion. Thereafter, by closing the opening portion, the vibration damping device 10 can be accommodated and disposed in the inner peripheral space of the intermediate portion in the longitudinal direction of the frame member 12. In addition, the vibration damping device 10 is disposed so that the longitudinal direction of the coupling metal 14 is the same as the longitudinal direction of the frame member 12, and a pair of first fittings attached to both longitudinal ends of the coupling metal 14. These foamed elastic bodies 16 and 16 are positioned at a predetermined distance from each other in the longitudinal direction of the frame member 12.

  When the vibration damping device 10 is mounted on the frame member 12, the first and second foamed elastic bodies 16 and 18 are both in contact with the inner peripheral surface of the frame member 12. That is, the height H in the vertical direction of the vibration damping device 10 is set to be larger than the height h of the inner circumferential space of the frame member 12, and based on the elasticity of the connection metal 14 itself, the connection metal 14 The upper end surface of the first foamed elastic body 16 attached to both ends in the longitudinal direction of the frame member 12 is pressed against the upper wall portion of the frame member 12 and attached to the longitudinal center portion of the connecting fitting 14. The lower end surface of the second foamed elastic body 18 is pressed against the lower wall portion of the frame member 12. As is clear from the above, in this embodiment, the pressing means and the holding means are constituted by the coupling metal 14, and the first and second foamed elastic bodies 16, using the elastic force of the coupling metal 14, 18 is held in a contact state pressed against the frame member 12.

  Further, the first and second foamed elastic bodies 16 and 18 are pressed against the frame member 12 in a non-adhesive manner, thereby permitting relative sliding displacement with respect to the frame member 12 in the longitudinal direction of the connection fitting 14. It has come to be. Particularly, in the first and second foamed elastic bodies 16 and 18 in which a large number of bubbles are exposed on the surface, the contact area with the inner peripheral surface of the frame member 12 can be suppressed to be small. The sliding displacement of the foamed elastic bodies 16 and 18 with respect to the frame member 12 is efficiently allowed. As is clear from the above description, in the present embodiment, both of the attachment portions provided at both ends in the longitudinal direction of the coupling metal 14 are slidably brought into contact with the frame member 12 so as to be slidable. A support portion provided at an intermediate portion in the longitudinal direction of the connection fitting 14 is a sliding allowance support portion that is brought into contact with the frame member 12 so as to be slidable and displaceable. Further, the relative displacement between the first and second foamed elastic bodies 16 and 18 and the frame member 12 only needs to be allowed in the longitudinal direction of the connection fitting 14, and the width direction (in FIGS. 1 and 2) perpendicular to the longitudinal direction. It may be constrained in the direction orthogonal to the paper surface, or may be allowed to slide.

  When vibration of a low frequency range of about 10 Hz is input to the frame member 12 while the vibration damping device 10 is mounted on the frame member 12, the vertical direction in which the longitudinal direction is the vibration mode direction in the frame member 12. Bending resonance occurs. When the frame member 12 is bent in the vertical direction, the distance between any two points on the frame member 12 becomes shorter than that in the stationary state.

  In this case, the vibration damping device 10 is separated from the frame member 12 and is attached without being bonded, and the first foamed elastic bodies 16, 16 are attached to the frame member 12 in the longitudinal direction of the connection fitting 14. Therefore, when the distance between any two points in the frame member 12 is shortened, the first elastic foam body 16 slides relative to the frame member 12. It can be displaced. The input vibration energy is converted into heat due to the sliding friction between the first foamed elastic body 16 and the frame member 12, so that the intended vibration damping effect is exhibited and the frame member 12. Vibration is reduced. As a result, it is possible to improve riding comfort and to reduce damage or deterioration of the frame member 12 caused by repeated large bending deformation due to resonance.

  Furthermore, in the present embodiment, the second foamed elastic body 18 attached to the center in the longitudinal direction of the connection fitting 14 is brought into contact with the frame member 12 in a state in which relative sliding is allowed. . Therefore, even when the longitudinal center portion of the connecting metal fitting 14 is displaced relative to the frame member 12, the damping effect based on the sliding friction between the second foamed elastic body 18 and the frame member 12. Thus, the vibration of the frame member 12 can be reduced.

  In particular, since the first and second foamed elastic bodies 16 and 18 that are the contact portions of the vibration damping device 10 with respect to the frame member 12 are both formed of a foamed elastic body, the frame member 12 and the first and second The area of contact between the two foamed elastic bodies 16 and 18 is reduced, and the sliding displacement is stably generated. As a result, sliding friction is stably and efficiently induced against bending deformation of the frame member 12 due to vibration input, and the intended damping effect can be effectively exhibited.

  In the present embodiment, the first and second foamed elastic bodies 16 and 18 are formed with a sufficient thickness in the vertical direction. Therefore, even when the first and second foamed elastic bodies 16 and 18 are worn, the air bubbles inside are exposed on the surface, so that the contact surface with respect to the vibration member is maintained to be a substantially constant rough surface, and slipping occurs. A damping effect due to friction can be obtained stably over a long period of time.

  Further, the first and second foam elasticity can also be obtained when the contact surfaces of the frame member 12 with respect to the first and second foam elastic bodies 16 and 18 are non-flat surfaces having surface roughness and distortion. The bodies 16 and 18 are formed to have a sufficient thickness and are worn according to the shape of the abutted surface, so that the first and second foamed elastic bodies 16 and 18 and the frame member 12 are interposed. A target contact state is realized. Furthermore, even when the first and second foamed elastic bodies 16 and 18 have large irregularities and distortions on the contact surfaces with respect to the frame member 12, the first and second foamed elastic bodies 16 and 18 are worn by the wear. The contact state is realized. Accordingly, the first and second foamed elastic bodies 16, 18 can be formed without setting the shapes of the contact surfaces of the first and second foamed elastic bodies 16, 18 and the contacted surfaces of the frame member 12 with high accuracy. The first and second foamed elastic bodies 16 and 18 and the frame member 12 which can realize the contact between the frame member 12 and the frame member 12 in a desired state and can exhibit an effective vibration damping effect are easily obtained. Can be manufactured.

3 and 4 show a vehicle vibration damping device 24 as a first reference example of the present invention. The vibration damping device 24 has a structure in which attachment members 28 as attachment portions are attached to both end portions of the connection fitting 26 in the longitudinal direction. In addition, in the following description, about the member thru | or site | part essentially the same as the said embodiment, detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

As shown in FIGS. 3 and 4, the connecting metal fitting 26 is a metal plate having a long rectangular flat plate shape spreading in a substantially constant thickness. In this reference example , the connection fitting 26 is formed of iron, aluminum alloy, or the like. Has been. In addition, the connecting metal fitting 26 is allowed to bend and deform in the vertical direction, which is the thickness direction, and substantially cannot expand or contract in the left-right direction in FIG. 3 which is the longitudinal direction. Yes.

  Further, attachment members 28 are attached to both ends in the longitudinal direction of the connection fitting 26. The mounting member 28 is superposed on one surface (upper surface in FIG. 3) of the connecting metal fitting 26 and fixed on the foamed elastic body 16 and the other surface (lower surface in FIG. 3) of the connecting metal fitting 26. A pressing rubber 30 is provided as an urging member that is fixed. The pressing rubber 30 is formed of a rubber elastic body having a rectangular parallelepiped shape substantially the same as the foamed elastic body 16, and has a Young's modulus set smaller than that of the foamed elastic body 16.

  A fixing metal fitting 32 is superimposed on the pressing rubber 30. As shown in FIG. 4, the fixing metal fitting 32 has a substantially constant groove shape extending in the longitudinal direction of the connecting metal fitting 26, and the groove width at the upper end which is the opening edge of the groove shape. A pair of fixing flanges 34, 34 extending outward in the direction is integrally formed. Bolt holes 36 are formed through the fixing flanges 34, respectively.

  The vibration damping device 24 having such a structure is attached to the frame member 12. That is, the fixing flange 34 of the fixing bracket 32 is overlapped with the lower end surface of the frame member 12, and the screwing hole 38 formed in the frame member 12 and having a thread formed on the inner peripheral surface thereof is formed in the fixing flange 34. The fixing bracket 32 integrally provided with the fixing flange 34 is formed by aligning with the bolt hole 36 formed in the screw hole 36 and screwing the mounting bolt 40 inserted through the bolt hole 36 into the screwing hole 38. It is fixed with respect to the member 12. As a result, both ends in the longitudinal direction of the connection fitting 26 are supported by the frame member 12 via the foamed elastic body 16.

  Here, when the fixing bracket 32 is attached to the frame member 12, the foamed elastic body 16 and the connecting bracket 26 are provided between the center portion (bottom wall portion) in the width direction of the fixing bracket 32 having a groove shape and the opposing surface of the frame member 12. And the pressing rubber 30 are sandwiched. And the foaming elastic body 16 and the longitudinal direction edge part of the connection metal fitting 26 are urged | biased by the frame member 12 side with the elastic force of the press rubber 30, and the foaming elastic body 16 is pressed with respect to the frame member 12. It is abutted.

Further, one surface in the thickness direction of the connecting fitting 26 is overlapped with the fixing fitting 32 via the pressing rubber 30, and the connecting fitting 26 is fixed to the fixing fitting 32 by elastic deformation in the shearing direction of the pressing rubber 30. The relative displacement in the longitudinal direction is allowed, and the other surface in the thickness direction of the connection fitting 26 is overlapped with the frame member 12 through the foamed elastic body 16 in a non-adhering manner, thereby The metal fitting 26 is allowed to be displaced relative to the frame member 12 in the longitudinal direction. In particular, in the present reference example , both end surfaces in the width direction (left and right end surfaces in FIG. 4) of the connection fitting 26 are positioned with a gap of a predetermined distance in the width direction with respect to the fixing fitting 32. Displacement is efficiently allowed. As described above, similarly to the first embodiment, the foamed elastic body 16 is slid relative to the frame member 12 by bending deformation of the frame member 12 in the vertical direction by vibration input.

Also in the vibration damping device 24 having the structure according to this reference example , as in the first embodiment, low frequency vibration is input to the frame member 12, and the frame member 12 is moved in the vibration mode direction. When bending is deformed up and down in a certain longitudinal direction, the damping effect of the vibration energy is exhibited based on the friction caused by the relative sliding displacement between the frame member 12 and the foamed elastic body 16, and the intended damping effect is effective. It has come to be demonstrated.

Further, in the vibration damping device 24 according to this reference example , the elastic force of the pressing rubber 30 provided separately from the connecting metal fitting 26 as the pressing means for urging the foamed elastic body 16 in the pressing direction against the frame member 12. Is used. Thereby, the shape of the connecting metal fitting 26 can be designed with a high degree of freedom. For example, the connecting metal fitting 26 can be realized by a flat iron plate or the like as shown in the present reference example .

  The vibration damping device 24 is attached to the outer peripheral surface of the frame member 12. Therefore, it can be easily attached to and detached from the frame member 12. In particular, the vibration damping device 24 can be retrofitted to the frame member 12 having a conventional structure by a simple operation, and an excellent vibration damping effect by attaching the vibration damping device 24 can be easily provided. I can do it.

Next, FIG. 5 shows a vehicle vibration damping device 42 as a second reference example of the present invention. The vibration damping device 42 includes a connection fitting 14 as a damping member, and an attachment member 43 as a sliding allowable attachment portion for attaching the connection fitting 14 to the frame member 12.

The attachment member 43 has a buffer rubber layer 44 and a foamed elastic body 16, and the foamed elastic body 16 formed of foamed rubber or the like is fixed to the connection fitting 14 via the buffer rubber layer 44. The buffer rubber layer 44 is formed of a thin rubber elastic body, and is vulcanized and bonded so as to cover both the upper and lower surfaces and the outer surface in the longitudinal direction at both ends in the longitudinal direction of the connecting fitting 14. In addition, the foamed elastic body 16 formed of a rectangular block-shaped foamed elastic body is fixed to the upper surface of the buffer rubber layer 44. The foamed elastic body 16 and the shock absorbing rubber layer 44 may be formed separately from each other and fixed to each other by an adhesive, ultrasonic welding, or the like, or may be integrally formed by two-color molding. May be. As described above, the attachment portion in the present invention does not necessarily need to be entirely formed of a foamed elastic body. In the attachment portion, as in the buffer rubber layer 44 and the foamed elastic body 16 shown in this reference example , The sliding portion that is brought into contact with the frame member 12 only needs to be formed of a foamed elastic body.

Further, in the present reference example , a bolt hole 46 penetrating in the thickness direction is formed in the central portion of the connection fitting 14. The bolt hole 46 is a small-diameter circular hole having a diameter corresponding to a support bolt 50 described later, and penetrates through the center in the longitudinal direction (left-right direction in FIG. 5) and the width direction (direction perpendicular to the plane of FIG. 5). It is formed to do.

The vibration damping device 42 having such a structure is mounted in the accommodated state at the intermediate portion in the longitudinal direction of the frame member 12 in the same manner as the vibration damping device 42 shown in the first embodiment. Further, in the present reference example , the bolt holes 46 formed in the central portion of the connecting metal fitting 14 are aligned with the insertion holes 48 formed so as to penetrate the lower wall portion of the frame member 12, and the bolt holes 46 are aligned. The support bolt 50 is inserted into the insertion hole 48, and the nut 52 is screwed to the support bolt 50, so that the central portion of the connection fitting 14 is fixedly supported to the frame member 12. ing. In this reference example , the fixing support portion is configured at the longitudinal center portion of the connection fitting 14 by bolting the longitudinal center portion of the connection fitting 14 to the frame member 12.

  Then, when the vibration damping device 42 is mounted on the frame member 12, it is attached to both ends in the longitudinal direction of the connection fitting 14 based on the elastic force of the connection fitting 14 formed of a metal material and bent in the vertical direction. The foamed elastic body 16 is pressed against the upper wall portion of the frame member 12 and is brought into non-adhesive contact.

  Here, when low-frequency vibration is input to the frame member 12 and the frame member 12 is bent and deformed in the vertical direction, the distance between any two points in the length direction of the frame member 12 is shortened. The frame member 12 and the foamed elastic body 16 are relatively slid and displaced. And the damping effect which suppresses the vibration of the frame member 12 using the energy attenuation by the friction between the frame member 12 and the foaming elastic body 16 is exhibited.

Further, in this reference example , since the central portion of the connecting metal fitting 14 is fixed with respect to the frame member 12, it is possible to prevent the mounting position of the vibration damping device 42 from being shifted with respect to the frame member 12. It is possible to prevent the vibration control effect from being lowered due to the displacement of the mounting position. The relative sliding displacement amount of the frame member 12 and the foamed elastic body 16 can be increased as the bending displacement amount in the vertical direction of the frame member 12 at the mounting position of the damping device 42 is increased. The vibration damping device 42 is preferably mounted at a substantially central portion in the vibration mode direction (length direction) in which the amount of displacement in the vertical direction of the frame member 12 increases, but the entire vibration damping device 42 is attached to the frame member 12. On the other hand, when relative displacement is permitted, the mounting position of the vibration damping device 42 is shifted toward the end of the frame member 12, so that the relative displacement amount of the frame member 12 and the foamed elastic body 16 is changed. This is because the vibration damping effect exerted by using the sliding friction may be reduced.

  In addition, since the cushioning rubber layer 44 that is more easily deformed than the foamed elastic body 16 is interposed between the foamed elastic body 16 and the connecting metal fitting 14, deformation and displacement of the foamed elastic body 16 are relatively easy. Is allowed to. This is because the cover and the buffer rubber layer 44 are elastically deformed according to the shape of the abutted portion (unevenness, distortion, inclination, etc.) with which the foamed elastic body 16 abuts on the frame member 12. As a result, uneven wear of the foamed elastic body 16 is reduced, and the contact state of the foamed elastic body 16 with the frame member 12 can be stably maintained over a long period of time.

FIG. 6 shows a vibration damping device 54 as a second embodiment of the present invention. The vibration damping device 54 includes a connection fitting 14 as a damping member, and the first foamed elastic body 16 is attached only to one end in the longitudinal direction of the connection fitting 14, and the connection fitting A bolt hole 46 penetrating in the up-down direction, which is the thickness direction of the connection fitting 14, is formed at the other end portion in the longitudinal direction of 14. Further, the second foamed elastic body 18 is fixed to the central portion in the longitudinal direction of the connection fitting 14 as in the first embodiment.

  The vibration damping device 54 having such a structure is disposed in a housed state in the inner circumferential space of the frame member 12 as in the first embodiment. In addition, the bolt hole 46 formed through the other end of the connection fitting 14 is aligned with the insertion hole 48 formed through the upper wall portion of the frame member 12, and the bolt hole 46 and the insertion hole are aligned. As the support bolt 50 is inserted into the support bolt 50 and the nut 52 is screwed into the support bolt 50, the other end portion in the longitudinal direction of the connecting fitting 14 is bolted to the frame member 12. Yes. As a result, the attachment portion at one end of the connection fitting 14 is formed of the first foamed elastic body 16 to be a sliding allowance attachment portion that is allowed to slide relative to the frame member 12, and the connection fitting 14. The mounting portion at the other end of the connecting member 14 is a fixed mounting portion that is configured by the end portion of the coupling metal 14 and is fixed to the frame member 12.

  According to the vibration damping device 54 having the structure according to this embodiment, when the frame member 12 is bent and deformed in the vertical direction at the time of input of vibration, the first and second foamed elastic bodies 16 and 18 are moved. Each of the first and second foamed elastic bodies 16 and 18 and the frame member 12 is slid in contact with the frame member 12, and based on the damping effect due to the sliding friction between the first and second foamed elastic bodies 16 and 18, the intended damping effect It has come to be demonstrated.

  Further, since the other end portion in the longitudinal direction of the connecting metal fitting 14 is fixed to the frame member 12, the vibration damping device 54 is largely moved with respect to the frame member 12, so that the mounting position of the vibration damping device 54 is Can be prevented from shifting. Therefore, it is possible to prevent the vibration damping performance from being lowered due to the displacement of the vibration damping device 54, and to obtain the desired vibration damping effect stably.

FIG. 7 shows a state in which the vehicle vibration damping device 56 as a third reference example of the present invention is attached to the frame member 58. The vibration damping device 56 includes a pair of connection fittings 26 extending in different directions, and the attachment members 28 shown in the first reference example are attached to both ends of each connection fitting 26 in the longitudinal direction. It has been. Further, in the present reference example , the pair of connecting fittings 26 and 26 are arranged so as to cross each other. These attachment members 28 are attached to the upper surface of the frame member 58 (the surface on the front side in the direction orthogonal to the paper surface in FIG. 7).

  The frame member 58 is, for example, a member that constitutes a subframe. As schematically shown in FIG. 7, the upper surface of the frame member 58 is attached to both end portions of the connecting fittings 26 extending so as to cross each other. The attachment members 28, 28 are widened with a sufficiently large area to which both can be attached. In FIG. 7, for ease of understanding, the frame member 58 is shown as a flat surface. However, the frame member 58 is a member constituting a known subframe, and actually has unevenness, curvature, and the like. The shape has.

The attachment members 28 and 28 attached to the respective connection fittings 26 are attached to the surface of the frame member 58, whereby each connection attachment 26 is attached to the frame member 58. The vibration damping device 56 having a structure according to this reference example is mounted on one surface of the frame member 58.

When the vibration damping device 56 having the structure according to this reference example is mounted on the vehicle, vibration is input to the frame member 58 and relative sliding displacement between the frame member 58 and the foamed elastic body 16 is achieved. Is generated, the desired vibration damping effect is exhibited by the sliding friction between each foamed elastic body 16 and the frame member 58.

Here, the vibration damping device 56 according to the present reference example includes a pair of connection fittings 26 to which the foamed elastic body 16 is attached at both ends, and the direction in which the pair of connection fittings 26 and 26 are different from each other is the longitudinal direction. And crossing each other at the intermediate portion in the longitudinal direction. Further, the foamed elastic body 16 attached to the connection fitting 26 is allowed to slide in the longitudinal direction of the connection fitting 26 with respect to the frame member 58. Accordingly, even when vibration in two different directions becomes a problem in the frame member 58, relative sliding displacement of the foamed elastic body 16 and the frame member 58 with respect to deformation of the frame member 58 in each vibration mode direction. As a result, the desired damping effect using energy loss due to sliding friction is effectively exhibited.

Although several embodiments and reference examples of the present invention have been described above, these are merely examples, and the present invention is interpreted in a limited manner by specific descriptions in the embodiments. is not.

  For example, it is only necessary that at least a contact portion with the vibration member in the sliding allowable mounting portion or the sliding allowable supporting portion is formed of a foamed elastic body, and the entire sliding allowable mounting portion or the sliding allowable supporting portion is necessarily a foamed elastic body. You don't have to. Specifically, for example, the sliding allowance mounting portion may be configured by fixing a foamed elastic body to a metal base, and the base may be fixed to the vibration damping member by bolt fixing.

  Moreover, self-lubricating property can also be provided to a foamed elastic body by adding a lubricant such as silicone oil to the material of the foamed elastic body. According to this, when the vibration is input, the foamed elastic body in the sliding allowable attachment portion causes a sliding displacement with respect to the vibration member with high responsiveness, and the intended vibration damping effect is exhibited with higher responsiveness.

In the first reference example , a structure using a rubber elastic body as the urging member is shown. However, the urging member does not necessarily have to be formed of a rubber elastic body, for example, a coil By disposing the spring between the opposing surfaces of the coupling metal 26 and the fixing metal 32 in the first reference example, it is possible to realize the pressing force of the biasing member using the biasing force of the coil spring. In addition, a metal leaf spring or the like can be used as the biasing member.

Further, as the fixed mounting portion and the fixed support portion, in the second reference example and the second embodiment, the example in which the damping member is fixed to the vibrating member by the bolt is shown. The fixing means to the vibration member in the fixed support portion is not necessarily limited to bolt fixing, for example, even when a part of the damping member is fixed to the vibration member by means such as welding, A fixed mounting portion and a fixed support portion can be realized.

In the first and second embodiments and the second reference example , there is shown a structure in which only one support portion is provided at the center portion in the longitudinal direction of the damping member. A plurality of support portions may be provided in the longitudinal intermediate portion of the vibration member. Further, when a plurality of support portions are provided, all of the plurality of support portions may be fixed support portions or slidable support portions, and some of them may be fixed support portions and others may be slid. As an allowable support part, it is good also as a structure provided with both the fixed support part and the sliding allowable support part.

  Further, by forming a rubber layer or the like on the surface of the vibration damping member, the surface of the vibration damping member may be entirely or partially covered with the rubber layer or the like. According to this, for example, it may be possible to improve the corrosion resistance of the vibration damping member.

  Further, the method of attaching the vibration damping device to the vibration member is not limited to the method shown in the first to fifth embodiments. Specifically, for example, the vibration damping device 10 can be mounted by being inserted from the longitudinal end opening of the frame member 12 and pushed to a predetermined mounting position. Further, for example, in a state in which the vibration damping device 10 is disposed at a predetermined position with respect to at least one of the pair of frame halves 20 and 20, the frame halves 20 and 20 are fixed to each other in advance, thereby damping the vibration in advance. It is also possible to form a frame member 12 in which the device 10 is accommodated.

  Further, for example, both longitudinal edge portions of the vibration damping member may protrude outward in the longitudinal direction from the attachment portion.

  Further, when the vibration member is an automobile frame, the present invention is applied to various known frame structures such as a backbone frame and a perimeter frame in addition to the ladder frame and the subframe shown in the embodiment. It is possible to apply.

  Further, the present invention can be suitably applied not only to a vibration damping device for automobiles but also to a vibration damping device for various vehicles such as for trains and bicycles.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

1 is a cross-sectional view showing a vibration damping device as a first embodiment of the present invention. Sectional drawing which shows the mounting state to the frame member of the vibration damping device. The III-III sectional view of Drawing 4 showing the wearing state to the frame member of the damping device concerning the 1st reference example of the present invention. IV-IV sectional drawing of FIG. Sectional drawing which shows the mounting state to the frame member of the damping device which concerns on the 2nd reference example of this invention. Sectional drawing which shows the mounting state to the frame member of the damping device which concerns on 2nd embodiment of this invention. The top view which shows the mounting state to the frame member of the damping device which concerns on the 3rd reference example of this invention.

10, 24, 42, 54, 56: Damping device, 12 , 58: Frame member, 14 , 26: Connecting metal fitting, 16 : First foamed elastic body, 18 : Second foamed elastic body , 28 , 43 : mounting member, 30: pressing rubber, 50: support bolt, 52: nut

Claims (5)

A vibration damping device attached to a vibration member of a vehicle,
The vibration damping member has a metal damping member formed in a longitudinal shape along with the vibration member, and attachment portions attached to the vibration member at both end portions in the longitudinal direction of the vibration damping member and the vibration damping A support portion attached to the vibration member is provided at an intermediate portion in the longitudinal direction of the member ,
At least one of which is a sliding permissible mounting portion is caused to relatively sliding displaceably abut against the vibrating member Rutotomoni of the mounting portion,
The support portion is a sliding allowance support portion that is brought into contact with the vibrating member so as to be relatively slidable,
In addition, a sliding portion of the sliding permissible mounting portion and the sliding permissible support portion with respect to the vibration member is formed of a foamed elastic body having a Young's modulus of 10 to 1000 MPa, and the sliding permissible mounting portion and the sliding permissible support portion A pressing means for pressing the foamed elastic body against the vibrating member and holding the elastic member in a contact state ; and
The vibration member has a hollow cross section, and the damping member is accommodated in the hollow inside of the vibration member,
Using the elastic force of the damping member, the support portion is pressed against one of the opposing surfaces on the inner circumferential surface of the vibration member, and the attachment portions at both ends of the vibration damping member are The vehicular vibration damping device according to claim 1, wherein the pressing means is configured by being pressed against the other of the opposing surfaces on the inner peripheral surface of the member .   The vehicular vibration damping device according to claim 1, wherein any of the attachment portions provided at both end portions in the longitudinal direction of the vibration damping member is the sliding allowable attachment portion.   The attachment portion on one end side in the longitudinal direction of the damping member is a fixed attachment portion fixed to the vibration member, and the attachment portion on the other end side in the longitudinal direction of the damping member is the vibration member. The vehicular vibration damping device according to claim 1, wherein the sliding permissible mounting portion is brought into contact with a member so as to be slidably displaceable. The vehicular vibration damping device according to any one of claims 1 to 3 , wherein the vibration member is an automobile frame. The vehicular vibration damping device according to any one of claims 1 to 4 , wherein a length of the vibration damping member is at least 1/10 of a free length of the vibration member in a vibration mode direction.

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