JP2017081539A - Damping material for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damping material for a vehicle which attains damping effect with a simple structure and achieves easiness of attachment workability and low costs.SOLUTION: A damping material (1) for a vehicle includes a mass body housing part (11), in which a hollow part (11a) is formed, and a grip part (12) which sandwiches a vehicle member (a reinforcement frame 100). The mass body housing part (11) and the grip part (12) are formed by elastic bodies, and a mass body (an iron core 13) is inserted into the hollow part (11a).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vibration damping material for a vehicle that is attached to a vehicle member including a door portion of an automobile or the like.

  Conventionally, various measures have been taken in order to reduce vibration and impact sound generated in a door portion of an automobile or the like. For example, Patent Document 1 discloses an automobile door structure in which a door reinforcing member is floatingly supported on a door inner plate via an attachment member and an elastic body, and the door reinforcing member is a dynamic damper structure. In Patent Document 2, a hollow tube-shaped sealing portion made of a compressible material containing a wire-shaped metal material along its length direction and a frame around a door opening of an automobile or the like are grasped. A sealing strip having a groove-like grip portion supporting the sealing portion as described above is disclosed.

Japanese Patent Laid-Open No. 5-246244 (published September 24, 1993) JP 9-300962 A (published on November 25, 1997)

  However, the door reinforcing member disclosed in Patent Document 1 is configured to be attached to a base member between a door inner plate and a door outer plate of an automobile, and is attached to another member of the automobile. I can't. In addition, since the door reinforcing member is fixed to the base member using bolts and nuts, it takes time and labor to install and remove, and the number of parts for mounting increases, resulting in high costs. It was.

  Moreover, the sealing strip disclosed by patent document 2 is a member for sealing opening parts, such as a door part of a motor vehicle, The installation location is limited to the opening part which needs to be sealed. Therefore, the above-described sealing strip is not configured to be attached to another member such as an automobile other than the opening. In addition, since the metal material is tightly fixed inside the sealing portion, the above-mentioned sealing strip is fixed with a gap between the metal material and the inner wall of the sealing portion, and the metal material is sealed. There is a problem that a sufficient vibration control effect cannot be obtained as compared with a configuration in which the inside of the section can be freely moved.

  The present invention has been made to solve each of the above-mentioned problems, and an object of the present invention is to obtain a vibration control effect with a simple configuration, and to various vehicle members with simple work and low cost. It is to realize a vibration damping material for a vehicle that can be attached.

  In order to solve the above problems, a vehicle vibration damping material according to one aspect of the present invention is a vehicle vibration damping material attached to a vehicle member, and has a hollow portion for accommodating a mass body. A mass body storage portion, and a grip portion for fixing the vehicle damping material to the vehicle member by sandwiching the vehicle member, and the mass body storage portion and the grip portion are elastic. The mass body is inserted into the hollow portion.

  According to the above configuration, the vehicle damping material according to the present invention includes the mass body housing portion in which the hollow portion is formed and the grip portion for fixing the vehicle damping material to the vehicle member. Moreover, a mass body accommodating part accommodates a mass body by inserting a mass body in a hollow part. Therefore, when the vehicle damping material according to the present invention is attached to the vehicle member, the vibration or impact sound generated in the vehicle member propagates to the mass body storage portion via the grip portion. At this time, since the mass body storage portion is formed of an elastic body, a portion substantially facing the grip portion of the mass body storage portion mainly serves as a spring. Therefore, the mass body stored in the mass body storage portion absorbs vibration or impact sound and vibrates instead of the vehicle member.

  As described above, the vehicle damping material according to the present invention can obtain a damping effect with a simple configuration without separately providing an elastic portion such as a spring.

  Moreover, according to the said structure, while the grip part is formed of the elastic body, it has the shape which pinches | interposes a vehicle member. Therefore, the vibration damping material for a vehicle according to the present invention does not need to be riveted, welded, or screw-fixed when attached to the vehicle member, and can be attached to the vehicle member with simple work and low cost. Moreover, since the vehicle damping material according to the present invention can be fixed simply by sandwiching the vehicle member at the grip portion, it can be attached to vehicle members of various shapes and sizes.

  Moreover, in order to solve said subject, in the vehicle damping material which concerns on 1 aspect of this invention, it is preferable that the space is formed between the internal wall surface in the said hollow part, and the said mass body.

  According to the above configuration, in the vehicle vibration damping material according to the present invention, a space is formed between the inner wall surface and the mass body in the hollow portion. Therefore, the mass body can freely move inside the hollow portion. For this reason, vibration can be absorbed also by the energy loss which arises when a mass body collides with the wall surface inside a hollow part.

  Therefore, as compared with the case where the space is not formed, the mass body can absorb more vibration generated in the vehicle member. From the above, it is possible to realize a vehicle damping material that can obtain a higher damping effect.

  In order to solve the above problem, in the vehicle vibration damping material according to one aspect of the present invention, the grip portion is provided with a support portion that elastically supports the mass body storage portion, It is preferable that the mass body storage portion, the support portion, and the grip portion are formed continuously.

  According to the said structure, the support part which elastically supports a mass body accommodating part is provided in the grip part. Therefore, when vibration or impact sound is generated in the vehicle member, the damping effect can be obtained by the support portion serving as a spring.

  Further, according to the above configuration, since the mass body storage portion, the support portion, and the grip portion are formed continuously, even when the support portion is provided in the vehicle vibration damping material according to the present invention, it is possible to perform extrusion molding or the like. It can be formed into a long shape.

  Moreover, in order to solve said subject, in the vehicle damping material which concerns on 1 aspect of this invention, it is preferable that the core material is embedded at the said grip part.

  According to the above configuration, since the core member is embedded in the grip portion, the rigidity of the grip portion is increased as compared with the case where the core member is not embedded. Therefore, since the surface of the vehicle member sandwiched between the grip portions is more strongly pressed, the grip portion can be more securely fixed to the vehicle members. Therefore, a vehicle damping material that can be more securely fixed to the vehicle member can be realized.

  In order to solve the above-described problem, in the vehicle damping material according to one aspect of the present invention, the grip portion includes a protrusion for fixing the vehicle damping material to the vehicle member. It is preferable that the grip portion is provided so as to protrude from at least one of the two inner surfaces facing each other.

  According to the said structure, the projection part is provided so that it may protrude from at least one of the two inner surfaces which mutually oppose in a grip part. Accordingly, since at least one of the surfaces of the vehicle member sandwiched between the grip portions is pressed by the protrusions, the grip portion can be more reliably fixed to the vehicle members.

  Moreover, since the protrusion is also formed of an elastic body, the vehicle member can be easily sandwiched by the grip portion. Therefore, even if there is no protrusion, the ease of attaching the vehicle damping material is not impaired.

  As described above, it is possible to realize a vehicle damping material that can be more reliably fixed to a vehicle member while ensuring ease of attachment work.

  In order to solve the above-described problem, in the vehicle vibration damping material according to one aspect of the present invention, another mass body having a mass different from that of the mass body can be inserted into the hollow portion. It is preferable.

  According to the said structure, the user can insert the mass body of the mass which exhibits the damping effect with respect to the vibration of the frequency for which he desires the reduction | decrease suitably in a hollow part. Therefore, the vibration damping material for a vehicle according to the present invention can accurately exhibit a vibration damping effect against vibrations of various frequencies generated in the vehicle member.

  In order to solve the above problem, in the vehicle vibration damping material according to one aspect of the present invention, the grip portion includes a sealant for fixing the vehicle vibration damping material to the vehicle member. It is preferable that a clamping space formed by two inner surfaces facing each other in the grip portion and an inner surface intersecting the two inner surfaces is filled.

  According to the above configuration, the sealant is filled in the clamping space formed in the grip portion. Since the sealant has an adhesive effect, when the vehicle member is sandwiched by the grip portion, the grip portion can be more securely fixed to the vehicle member by inserting the vehicle member into the sealant.

  The vibration damping material for a vehicle according to one aspect of the present invention can obtain a vibration damping effect with a simple configuration and can be attached to a vehicle member with simple work and low cost.

(A) is a perspective view which shows typically the state by which the damping material for vehicles which concerns on this invention was attached to the reinforcement frame. (B) is sectional drawing which shows schematically the structure of the door for motor vehicles in which the damping material for vehicles which concerns on this invention was attached. It is sectional drawing which cut | disconnected the damping material for vehicles which concerns on one Embodiment of this invention by the plane orthogonal to the X-axis. (A) is a perspective view which shows typically the state by which the vehicle damping material which concerns on one Embodiment of the vehicle damping material which concerns on this invention was attached to the vehicle member. (B) is a perspective view schematically showing a state in which a vehicle damping material according to another embodiment of the vehicle damping material according to the present invention is attached to a reinforcing frame. It is sectional drawing which cut | disconnected the damping material for vehicles which concerns on other embodiment of the damping material for vehicles which concerns on this invention by the plane orthogonal to an X-axis. (A)-(e) is a perspective view which shows typically the damping material for vehicles which concerns on other embodiment of the damping material for vehicles which concerns on this invention. (A) is a figure which shows the test method about the damping effect obtained when the damping material for vehicles which concerns on one Embodiment of this invention is attached to a reinforcement frame. (B) is a graph which shows the result of having carried out the above-mentioned test method. (A) And (b) is the test method about the damping effect obtained when the vehicle damping material which concerns on other embodiment of the vehicle damping material which concerns on this invention is attached to the jig for a test. FIG. It is a graph which shows the result of having implemented the test method shown in FIG.

<Vehicle damping material installation example>
First, the structure of an automobile door 500 to which a vehicle damping material 1 according to an embodiment of the present invention is attached will be described with reference to FIG. As shown in FIGS. 1A and 1B, the vehicle damping material 1 is attached to a reinforcing frame (vehicle member) 100 provided on a door outer panel 501 of an automobile door 500, thereby being used for an automobile. Vibration and impact sound generated in the door 500 are reduced. Specifically, as shown in FIG. 1 (b), the vehicle damping material 1 has a protrusion 101 arranged on the lowest vertical side among the three protrusions provided on the reinforcing frame 100. It is attached. The vehicle damping material 1 may be attached to any one of the two protruding portions other than the protruding portion 101. 1 is merely an example, and the vehicle vibration damping material 1 protrudes from various vehicle members constituting an automobile (not shown) in addition to the reinforcing frame 100. It can also be attached to parts.
<Structure of vehicle damping material>
Next, with reference to FIG. 2, the structure of the vibration damping material 1 for vehicles which concerns on one Embodiment of this invention is demonstrated. As shown in FIG. 2, the vehicle damping material 1 includes a mass body housing part 11 and a grip part 12 formed of an elastic body, a cylindrical iron core (mass body) 13, and a core material 14. . Moreover, the mass body storage part 11 and the grip part 12 are formed in a row.

  The mass body storage portion 11 has a substantially rhombic cross-sectional shape cut by a plane orthogonal to the X axis in FIG. 2, and a hollow portion 11 a for storing the iron core 13 is formed. The hollow portion 11a has a substantially oval cross-sectional shape cut by a plane orthogonal to the X axis, and the mass body storage portion 11 stores the hollow portion 11a by inserting the iron core 13 into the hollow portion 11a.

  In addition, the said cross-sectional shape of the mass body accommodating part 11 is not necessarily limited to a substantially rhombus shape, For example, various cross-sectional shapes, such as circular shape and square shape, are employable. Further, the cross-sectional shape of the hollow portion 11a is not limited to a substantially elliptical shape, and the mass body according to the cross-sectional shape and size of the iron core 13 cut along a plane orthogonal to the X axis in FIG. The storage part 11 should just be the cross-sectional shape which can store the iron core 13. FIG.

  In addition, as shown in FIG. 2, a space 11 c is formed between the inner wall surface 11 b and the iron core 13 in the hollow portion 11 a in a state where the iron core 13 is inserted into the hollow portion 11 a. Therefore, when vibration is generated in the automobile door 500, the portion of the mass body storage portion 11 that substantially faces the grip portion 12 and the portion that forms the space 11c play a role of absorbing vibration.

  As shown in FIG. 2, the grip portion 12 fixes the vehicle damping material 1 to the reinforcing frame 100 by sandwiching the protruding portion 101 of the reinforcing frame 100. Further, the grip portion 12 has two protrusions 12a for fixing the vehicle damping material 1 to the reinforcing frame 100, two from each of the two inner surfaces 12b facing each other in the grip portion 12 (four in total). 2 are provided so as to protrude substantially along the X-axis in FIG.

  The sealant 15 is in contact with the inner surface 12c in the clamping space 12d formed by the two inner surfaces 12b of the grip portion 12 and the inner surface 12c that is substantially orthogonal to (intersects) the two inner surfaces 12b. So that it is filled. By inserting the protrusion 101 into the sealant 15, the vehicle damping material 1 is more firmly fixed to the reinforcing frame 100. A polyisobutylene sealant is used as the sealant material. The filling mode of the sealant 15 is not limited to the above case. For example, the sealing space 12d may be filled in a state of being held only by the two inner surfaces 12b without contacting the inner surface 12c. (Not shown). Further, since the sealant 15 is a member for strengthening the fixing force of the grip portion 12 to the last, it is not an essential component for the vehicle damping material 1.

  The number, shape, arrangement, and the like of the protrusions 12a are arbitrary depending on the thickness of the protruding portion 101 of the reinforcing frame 100, the shape and size of the vehicle member when attached to a vehicle member other than the reinforcing frame 100, and the like. Can be designed to For example, although not shown, the protruding portion 12a may protrude from only one side of the two inner surfaces 12b of the grip portion 12, or three or more protruding portions 12a may be provided for each inner surface 12b. In addition, the angle at which the protrusion 12a is inclined with respect to the inner surface 12b can be appropriately designed in consideration of ease of attachment and whether or not the fixing is more reliable.

  Further, by forming the shape of the grip portion 12 such that the separation width of the two inner surfaces 12b and the thickness of the protruding portion 101 in the grip portion 12 are substantially the same, the vibration damping material 1 for a vehicle is provided without providing the projection portion 12a. Can be fixed to the reinforcing frame 100. Therefore, it is not essential to provide the protruding portion 12 a on the grip portion 12.

  The mass body storage part 11, the grip part 12, and the projection part 12a are all formed of the same elastic body. Examples of the elastic body used for forming these materials include natural rubber or rubber materials mainly composed of CR (chloroprene rubber), EPDM (ethylene-propylene-diene copolymer rubber), various thermoplastic elastomers, urethane, PVC ( Polyvinyl chloride).

  In addition, the material of the mass body accommodating part 11 and the material of the grip part 12 do not need to be the same, and you may differ both materials. Further, the material of the protrusion 12a and the material of the grip 12 do not have to be the same, and the materials of both may be different. That is, the protrusion 12a only needs to be formed of an elastic body that makes the vehicle damping material 1 fixed to the reinforcing frame 100 more reliable.

  The iron core 13 is a mass body that absorbs vibration generated in the automobile door 500 and vibrates by itself. In addition to the iron core 13, for example, a mass body made of a metal other than iron may be used. Moreover, the shape of the iron core 13 is not limited to a cylindrical shape, and may be, for example, a rectangular column shape including a rectangular parallelepiped shape. Furthermore, for example, by adopting a configuration in which the openings at both ends of the hollow portion 11a are closed by a freely openable / closable member such as a lid, a configuration in which the iron core 13 and the inner wall surface 11b of the hollow portion 11a are in close contact, etc. It becomes possible to insert the iron core 13 having various masses into the hollow portion 11a. By changing the mass of the iron core 13 in this way, it is possible to reduce vibrations of various frequencies generated in the automobile door 500.

  The core member 14 is a member for increasing the rigidity of the grip portion 12 and improving the fixing force of the grip portion 12 by being embedded in the grip portion 12. The core member 14 has a substantially U-shaped cross-section cut along a plane orthogonal to the X axis in FIG. The core member 14 is made of a material that increases the rigidity of the grip portion 12, such as various metals including iron or hard resin.

  The thickness of the core member 14 may be arbitrarily designed according to the grip portion fixing force required by the user, the cost, the weight of the vehicle damping material 1, and the like. Moreover, since the core material 14 is a member for strengthening the fixing force of the grip portion 12 to the last, it is not an essential component for the vehicle vibration damping material 1.

  Next, points to be considered when setting the length in the X-axis direction in FIG. 2 in the vehicle damping material 1 (hereinafter simply referred to as “length”) will be described with reference to FIG.

  First, as shown in FIG. 3 (a), when a long vehicle damping material 1 that can be mounted over the entire long protrusion provided on a vehicle member is manufactured, Since the absorption rate by which the iron core 13 absorbs the vibration generated in the door 500 increases, a high vibration damping effect can be obtained. Next, as shown in FIG. 3B, when the vehicle-shaped vibration damping material 1 having a short shape that can be attached to a part of the protruding portion 101 of the reinforcing frame 100 is manufactured, the vehicle vibration damping material 1 is manufactured. Therefore, the user can easily grip the vehicle damping material 1 with both hands, and therefore can easily perform the attaching operation and the detaching operation.

  From the above, after considering the merit when the vehicular damping material 1 is elongated and the merit when it is shortened according to the length of the vehicle member to be attached including the reinforcing frame 100, respectively. Thus, the vibration damping material 1 for vehicles having various lengths in the X-axis direction can be manufactured and attached to the vehicle member.

  Next, as an embodiment of the vehicle damping material 1 according to the present invention, not only the above-described vehicle damping material 1 but also various variations are assumed. Will be described.

  As shown in FIG. 4, the vehicle damping material according to the present invention has the structure in which the grip portion 12 is provided with a support portion 21 that elastically supports the mass body storage portion 11. Is included as an embodiment. By providing the support portion 21, when vibration occurs in the automobile door 500, the support portion 21 serves as a spring. Here, the spring in the vehicular damping material 2 has a role of a spring in the vehicular damping material 1 and is compared with the portion that substantially faces the grip portion 12 in the mass body housing portion 11 and the portion that forms the space 11c. The portion serving as a role (that is, the support portion 21) has a wider area. Therefore, a higher damping effect can be obtained by attaching the vehicle damping material 2. As the length of the support portion 21 in the Y-axis direction is increased, the region serving as a spring is expanded, and the vibration damping effect is further enhanced.

  In the vehicle damping material 2, the material that forms the support portion 21 is the same elastic body as the elastic body that forms the mass body storage portion 11 and the grip portion 12, but both are made of different materials. It may be formed.

  Further, as shown in FIG. 5 (a), the vehicle vibration damping material according to the present invention has a structure in which a support portion 31 having the same role as the support portion 21 is provided. 3 is included as an embodiment. Further, as shown in FIG. 5B, the vehicle vibration damping material according to the present invention has a structure in which a support portion 41 having the same role as the support portion 21 is provided. 4 is included as an embodiment.

  The support part 31 is a part having substantially the same shape and size as the mass body housing part 11, and no mass body such as an iron core is inserted into the hollow part 31a. The support portion 41 has a shape obtained by further extending the support portion 21 in the Y-axis direction (see FIG. 4), and is formed of sponge-like rubber.

  The support portion 31 and the support portion 41 are softer than the support portion 21 and have a shape that is easily elastically deformed. Therefore, by providing the support portion 31 or the support portion 41, the iron core 13 stored in the mass body storage portion 11 vibrates more greatly than when the support portion 21 is provided. Therefore, the vehicular damping materials 3 and 4 can obtain a larger resonance peak than the vehicular damping materials 1 and 2, and can obtain a higher damping effect.

  Specifically, as shown in FIGS. 5A and 5B, even when the protruding portion 101 of the reinforcing frame 100 protrudes vertically upward, the vehicle damping material 3 is provided on the protruding portion 101. Alternatively, by attaching 4, it is possible to effectively suppress not only the horizontal vibration of the protrusion 101 but also the vertical vibration.

  Further, as shown in FIG. 5C, the vehicle damping material according to the present invention has a structure in which one mass body storage portion 11 is provided on one of the side walls 12e of the grip portion 12. The vehicle damping material 5 is included as an embodiment. Thus, by providing the mass body storage portion 11 on the side wall 12 e of the grip portion 12, the mass body storage portion 11 is more prominent than the mass body storage portion 11 of the vehicle damping material 1. It becomes easy to vibrate in the stretching direction.

  Therefore, as shown in FIG. 5C, even when the protrusion 101 of the reinforcing frame 100 protrudes vertically upward, by attaching the vehicle damping material 5 to the protrusion 101, in particular, Vibration in the vertical direction of the protrusion 101 (that is, the extending direction of the protrusion 101) can be effectively suppressed.

  Further, as shown in FIG. 5 (d), in the vehicle damping material according to the present invention, one of the two mass body storage portions 11 is provided on one of the side walls 12e of the grip portion 12, and the two mass bodies are provided. The embodiment includes a vehicle damping material 6 having a structure in which the other storage portion 11 is provided on the other side wall 12e. Thus, by providing the mass body storage portion 11 on each of the side walls 12 e of the grip portion 12, these two mass body storage portions 11 can be reinforced frame like the mass body storage portion 11 of the vehicle damping material 5. It becomes easy to vibrate in the extending direction of 100 protrusions 101.

  Furthermore, since the two mass body storage portions 11 are arranged so as to be substantially symmetrical in the horizontal direction with respect to the grip portion 12, the case where there is one mass body storage portion 11 (vehicle damping material 5). In comparison with the increase in the amount of vibration absorption, the two mass body storage portions 11 can absorb the vibration in a well-balanced manner. Therefore, as shown in FIG. 5D, even when the protruding portion 101 of the reinforcing frame 100 protrudes vertically upward, by attaching the vehicle damping material 6 to the protruding portion 101, in particular, The vibration in the vertical direction of the protrusion 101 can be more effectively suppressed.

  Further, as shown in FIG. 5E, the vehicle damping material according to the present invention has a structure in which a support portion 71 that plays the same role as the support portion 21 of the vehicle damping material 2 is provided. A vehicle damping material 7 is included as an embodiment. The support part 71 is a part having substantially the same shape and size as the support part 21, and extends obliquely from the side wall 12 e of the grip part 12 toward the vertical upper side. In other words, the support portion 71 includes a plane including a plurality of axes L1 in the protruding direction of the protruding portion 101 and a short length of the supporting portion 71 in a state where the vehicle damping material 7 is attached to the protruding portion 101 of the reinforcing frame 100. A plane including a plurality of axis lines L2 in the hand direction is provided so as to cross obliquely.

  By providing such a support portion 71, the support portions 21, 31, and 41 (extending in the same direction as the extending direction of the protruding portion 101 of the reinforcing frame 100) or the direction orthogonal to the extending direction of the protruding portion 101 are extended. Compared to the supporting portion (not shown), the horizontal vibration and the vertical vibration of the protruding portion 101 can be suppressed in a balanced manner.

  As described above, the vehicle damping material according to the present invention can be obtained by appropriately changing the shape / size / extension direction / arrangement of the support portion relative to the grip portion, the arrangement relative to the grip portion of the mass body storage portion, Irrespective of the structure of the member, it is possible to suppress vibrations in all directions generated in the vehicle member.

  Although not shown in the drawings, as another embodiment of the vehicle damping material according to the present invention, the hollow portion 11a is not formed with the space 11c, and the two inner surfaces 12b of the grip portion 12 each have three or more protrusions. The thing provided with the part 12a, the thing by which the some core material 14 is embedded in the grip part 12, etc. are assumed.

<Vibration damping effect obtained when vehicle damping material is attached>
Next, with reference to FIG. 6, the vibration damping effect obtained when the vehicle damping material 1 is attached to the reinforcing frame 100 will be described.

  (1) When nothing is attached to the reinforcing frame 100 (not shown), (2) As shown in FIG. 6A, when the vehicle damping material 1 is attached to the reinforcing frame 100, By outputting white noise from a speaker (not shown) arranged outside the automobile toward the automobile door 500, acoustic excitation is performed on the automobile door 500. The sound pressure level was measured at a sound measurement position S provided in the space formed between the door outer panel 501 and the door inner panel and on the vertical upper side of the reinforcing frame 100. In this measurement, one-third octave analysis was performed, and the sound pressure levels for each frequency were compared.

  As shown in the graph of FIG. 6B, (1) when nothing was attached to the reinforcing frame 100, at the sound measurement position S, a sound pressure level of about 80 dB was measured at a frequency of 160 Hz. On the other hand, (2) when the vehicle damping material 1 is attached to the reinforcing frame 100, at the sound measurement position S, a sound pressure level of about 77 dB was measured at a frequency of 160 Hz. Therefore, it has been found that the sound pressure level is reduced by about 3 dB by attaching the vehicle damping material 1 to the reinforcing frame 100.

  Also from this test result, it was found that a high damping effect can be obtained by attaching the vehicle damping material 1 to a vehicle member such as the reinforcing frame 100. Specifically, by storing the iron core 13 in the mass body storage portion 11 formed of an elastic body, the portion of the mass body storage portion 11 that substantially faces the grip portion 12 functions as a spring, and the iron core 13 Has been found to effectively absorb vibration.

  Next, referring to FIG. 7 and FIG. 8, the vibration damping obtained when the vehicle damping material 3 is attached to the test jig and when the vehicle damping material 5 is attached to the test jig. The effect will be described.

  As a test method, the central excitation method was adopted among the vibration damping characteristics test method (JIS K7391) of the unconstrained vibration-damping composite beam. That is, as shown in FIG. 7A, after attaching the test jig to the impedance head (Bruel & Kjaer: Type 8001) of the vibrator (Bruel & Kjaer (Bruel Care): Type 4810), (1) test In addition to the case where nothing is attached to the jig, (2) when the vehicle damping material 1 is attached to the test jig, (3) when the vehicle damping material 3 is attached, (4) for the vehicle For each of the cases where the damping material 5 is attached, the vibrator is vibrated for a predetermined time. Next, the resonance frequency in each of the cases (1) to (4) was determined from the graph of the frequency response function (impedance) obtained by vibrating the vibrator for a predetermined time.

  Specifically, as shown in FIG. 7 (b), an iron plate having a thickness of 1.6 mm formed into a concave cross section (width / height: 30 mm) was used as a test jig. Further, the test was performed by attaching the bottom wall of the test jig to the impedance head and attaching the vehicle damping material 5 to the side wall of the test jig. In FIG. 7B, only the case where the vehicle damping material 5 is attached to the test jig is shown, but the same applies to the vehicle damping materials 1 and 3 as well. Attach to the side wall.

  As shown in the graph of FIG. 8, (1) When nothing is attached to the test jig, the frequency response function is the largest and fluctuates by about 1 dB in the frequency range of about 120 Hz. ) When the vehicle damping material 1 is attached, the frequency response function varies by about 11 dB in the frequency range of about 110 Hz to about 120 Hz.

  On the other hand, when (3) the vehicle damping material 3 is attached to the test jig, the frequency response function fluctuates by about 20 dB in the frequency range of about 35 Hz to about 50 Hz, and (4) the vehicle damping material 5 is attached. In this case, the frequency response function fluctuates by about 20 dB in the frequency range of about 105 Hz to about 140 Hz.

  As described above, when the vehicle damping material 3 or 5 is attached to the test jig, the frequency response function fluctuates about twice as compared with the case where the vehicle damping material 1 is attached, and a larger resonance peak is generated. It turns out that it is obtained. That is, in the vehicle damping material according to the present invention, the hollow cylindrical support portion 31 (see FIG. 5A) is provided, or the mass body storage portion 11 is provided on the side wall 12e of the grip portion 12 (see FIG. 5). 5 (c)), it was found that the vibration in the vertical direction generated in the vehicle member protruding in the vertical direction can also be effectively suppressed. Note that such a vibration damping effect against vertical vibration can also be obtained by using, for example, the vehicle damping material 4, 6 or 7.

1, 2, 3, 4, 5, 6, 7 Vehicle damping material 11 Mass body storage portion 11a Hollow portion 11b Internal wall surface 11c Space 12 Grip portion 12a Projection portion 12b Inner surface 12c Inner side surface 12d Clamping space 13 Iron core (Mass body)
14 Core material 15 Sealant 100 Reinforcement frame (vehicle member)

Claims (7)

A vibration damping material for a vehicle attached to a vehicle member,
A mass body housing portion in which a hollow portion for housing the mass body is formed; and a grip portion for fixing the vehicle damping material to the vehicle member by sandwiching the vehicle member. ,
The vehicle mass damping member, wherein the mass body storage portion and the grip portion are formed of an elastic body, and the mass body is inserted into the hollow portion.   The vehicle damping material according to claim 1, wherein a space is formed between an inner wall surface in the hollow portion and the mass body. The grip portion is provided with a support portion that elastically supports the mass body storage portion,
The vehicle damping material according to claim 1 or 2, wherein the mass body storage portion, the support portion, and the grip portion are formed in a row.   The vehicular damping material according to any one of claims 1 to 3, wherein a core material is embedded in the grip portion.   The grip portion is provided with a protrusion for fixing the vehicular damping material to the vehicle member so as to protrude from at least one of two opposing inner surfaces of the grip portion. The vehicle damping material according to any one of claims 1 to 4.   The vehicular damping material according to any one of claims 1 to 5, wherein another mass body having a mass different from that of the mass body can be inserted into the hollow portion.   In the grip portion, a sealant for fixing the vehicle damping material to the vehicle member is formed by two inner surfaces facing each other in the grip portion and an inner surface intersecting the two inner surfaces. The vehicular damping material according to any one of claims 1 to 6, wherein the clamping space is filled.

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