JP2009264553A - Suspension support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exhibit a high damping characteristic by reducing the preliminary compression ratio of an elastic member composed of a foaming resin mold, while maintaining a static spring constant. <P>SOLUTION: A suspension support 10 has the annular elastic member 16 composed of a foaming urethan mold interposed between an inside member 12 and an outside member 14. The inside member 12 has a flange part 20. The outside member 14 has a cylindrical part 22, an upper sidewall part 24 and a lower sidewall part 26 for interposingly pressing the elastic member 16 in the axial direction X in both end parts in its axial direction. The elastic member 16 has an upper side elastic part 42 interposingly pressed and held between an upper surface 20A of the flange part and an under surface 24A of the upper sidewall part, and a lower side elastic part 44 interposingly pressed and held between an under surface 20B of the flange part and an upper surface 26A of the lower sidewall part. The lower side elastic part 44 is composed of a rubber elastic part 46 interposingly pressed between the flange part 20 and the lower sidewall part 26, and a foaming resin elastic part 72 composed of the foaming resin mold. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a suspension support for elastically coupling a piston rod of a shock absorber in a suspension mechanism of a vehicle such as an automobile to a vehicle body.

  2. Description of the Related Art Conventionally, in an automobile suspension mechanism, in order to suppress transmission of vibration from the wheel side to the vehicle body side, an inner member into which an upper end portion of a piston rod of a shock absorber is inserted and fixed, and an outer periphery of the inner member are surrounded. A suspension support including an outer member attached to the side and an annular elastic member interposed between the inner member and the outer member is used (see Patent Document 1 below).

As the elastic member, a rubber material is generally used, but recently, an attempt has been made to adopt a foamed resin material having an open cell structure such as foamed urethane (see Patent Document 2 below). Due to the material properties of urethane foam, it is possible to increase the damping performance while suppressing the dynamic magnification and to improve the riding comfort as compared with the rubber material.
JP 2003-278822 A JP 2003-184937 A

  The elastic member is used by being incorporated into the suspension support in a state of being pre-compressed in the axial direction. However, in order to effectively use the high damping characteristic of urethane foam, it is possible to use it with a reduced pre-compression rate. desirable. However, when the precompression ratio is low, the static spring constant (static spring constant in the axial direction) as the suspension support is low, and steering stability is impaired.

  In addition, in the elastic member made of urethane foam, the static spring constant at the time of displacement toward the bound side (that is, when the inner member is displaced upward) and the displacement at the rebound side (that is, downward of the inner member). It is difficult to make a difference with the static spring constant at the time of relative displacement.

  The present invention has been made in view of the above points, and while maintaining a static spring constant in the axial direction, lowers the precompression ratio of an elastic member made of a foamed resin molded body and exhibits high damping characteristics. It is an object to provide a suspension support that can.

  A suspension support according to the present invention includes an inner member into which an upper end portion of a piston rod of a shock absorber is inserted and fixed, an outer member that surrounds an outer periphery of the inner member and is attached to a vehicle body side, and the inner member and the outer member. An annular elastic member formed of a foamed resin molded body having an open cell structure interposed therebetween, and the inner member includes a flange portion projecting outward in the direction perpendicular to the axis of the piston rod, and the outer member A cylindrical portion containing the elastic member, and an upper side wall portion and a lower side wall portion that are formed inward in a direction perpendicular to the axial direction at both axial end portions of the cylindrical portion and clamp the elastic member in the axial direction. The elastic member includes an upper elastic portion held between the upper surface of the flange portion and the lower surface of the upper side wall portion, and between the lower surface of the flange portion and the upper surface of the lower side wall portion. A lower elastic portion that is held by pressure, and at least one of the upper elastic portion and the lower elastic portion is pinched between the flange portion and the upper or lower side wall portion. And a foamed resin elastic part made of the foamed resin molded body.

  As described above, the elastic part of at least one of the upper and lower sides of the flange part is configured by combining the rubber elastic part and the foamed resin elastic part. The characteristic can be exhibited. Further, the lack of the static spring constant due to the low precompression ratio can be compensated by the rubber elastic portion. Therefore, while maintaining the static spring constant in the axial direction, it is possible to exhibit high damping characteristics with the foamed resin elastic portion having a low preliminary compression rate, and it is possible to improve ride comfort and steering stability.

  In addition, for example, when one of the upper elastic portion and the lower elastic portion is constituted by a combination of a rubber elastic portion and a foamed resin elastic portion, and the other elastic portion is constituted by a foamed resin molded body, The difference in static spring constant between the one side and the other side can be made large.

  In the said structure, it is practically preferable from the point of the said effect that the rubber elastic part is provided with two or more with the foamed resin elastic part in the circumferential direction of an elastic member.

  In the above configuration, the rubber elastic portion is provided in a convex shape at a plurality of locations in the circumferential direction on the upper surface or the lower surface of the flange portion, and the plurality of foamed resin elastic portions are integrated by connecting an outer peripheral portion with an annular connecting portion. The flange portion may be provided with a regulating rubber portion that abuts on the inner peripheral edge of the foamed resin elastic portion and restricts the displacement of the foamed resin elastic portion in the direction perpendicular to the axis. In this case, the plurality of foamed resin elastic portions are formed as an annular integrated product, and an elastic member is formed by combining this with a rubber elastic portion on the flange portion. At that time, since the restriction rubber portion is provided in the flange portion, the positioning of the foamed resin elastic portion in the direction perpendicular to the axis can be ensured, and the performance variation can be eliminated.

  In the above configuration, the rubber elastic portion is provided at two locations facing in the direction perpendicular to the axis across the inner member and a plurality of circumferential positions other than the two locations, and rubber elasticity facing in the direction perpendicular to the axis. If the circumferential width of the part is set larger than that of the rubber elastic part at the other circumferential position, the following effects can be obtained. That is, in order to further improve the ride comfort, it is desirable to reduce the static spring constant in the twisting direction, which is the direction in which the axis of the inner member is inclined, but simply reducing the static spring constant in the twisting direction. The static spring constant in the axial direction is also reduced. On the other hand, by giving a difference in the circumferential width of the rubber elastic portion as described above, it is possible to give directionality to the twisting characteristics. Therefore, while maintaining the static spring constant in the axial direction, the static spring constant in the twisting direction (in particular, the twisting direction in the direction in which the axis of the inner member is inclined in the direction perpendicular to the axis perpendicular to the axis perpendicular direction). Can be reduced. Therefore, riding comfort can be improved without sacrificing steering stability.

  In the above configuration, when the air chamber is provided inside the rubber elastic portion and the air chamber is provided in communication with the outside air through the throttle passage, the following operational effects are obtained. That is, in this case, when the inner member is displaced relative to the outer member in the axial direction, the air chamber in the rubber elastic portion expands and contracts, so that air enters and exits through the throttle passage. Since the attenuation performance can be enhanced by the phase delay due to the entry and exit of air, the attenuation performance can be improved while suppressing the dynamic magnification. Therefore, even the rubber elastic part can exhibit the same damping performance as the foamed resin elastic part.

  In the above-described configuration, the air chamber is formed between a concave portion provided in a contact surface of the rubber elastic portion with the flange portion and the flange portion, and the throttle passage is formed by the rubber elastic portion. In the contact surface with the flange part, the groove part may be formed between the groove part and a groove extending inward in the direction perpendicular to the axis from the recessed part. In this case, the air chamber and the throttle channel can be easily formed, and the manufacturing cost can be suppressed.

  In the above configuration, one of the upper elastic portion and the lower elastic portion is constituted by the rubber elastic portion and the foamed resin elastic portion, and an air chamber is provided inside the rubber elastic portion. The air chamber is provided in communication with the outside air through the throttle passage, and the other elastic portion of the upper elastic portion and the lower elastic portion is formed of a foamed resin molded body having an open cell structure over the entire circumference, An air chamber communicating with the outside air through the open bubbles may be provided inside the other elastic portion. Thus, by providing the air chamber not only in the rubber elastic portion but also in the elastic portion made of the foamed resin molded body, further high attenuation characteristics can be exhibited.

  As described above, the suspension support of the present invention can exhibit a high damping characteristic by reducing the precompression ratio of the elastic member made of the foamed resin molding while maintaining the static spring constant.

(First embodiment)
FIG. 1 is a sectional view of a suspension support 10 according to the first embodiment of the present invention, and FIG. 2 is an exploded sectional view thereof. The suspension support 10 is a strut mount for an automobile, and includes a metal inner member 12 into which an upper end portion 1A of a shock absorber piston rod 1 is inserted and fixed, and a metal outer member that surrounds the outer periphery thereof and is attached to the vehicle body panel 2. The member 14 includes an annular elastic member 16 that is interposed between the inner member 12 and the outer member 14 and supports the inner member 12 against the outer member 14 in a vibration-proof manner. The suspension support 10 is provided with the axial direction X of the piston rod 1 as the vertical direction.

  The inner member 12 includes a cylindrical inner cylinder portion 18 into which the upper end portion 1A of the piston rod 1 is inserted from below, and a ring plate that protrudes to the outer side Yo in the direction perpendicular to the axis of the piston rod 1 at the upper end portion of the inner cylinder portion 18. And a flange portion 20 having a shape.

  The outer member 14 includes an elastic member 16 and a cylindrical portion 22 that concentrically surrounds the inner member 12, and is formed inwardly Yi in the direction perpendicular to the axis Y at both ends in the axial direction X of the cylindrical portion 22. The upper side wall part 24 and the lower side wall part 26 which clamp the elastic member 16 in the axial direction X are provided, and it is formed in the container shape which accommodates the elastic member 16 in an inside. Both the upper wall portion 24 and the lower wall portion 26 have a ring plate shape, and are provided with circular openings 28 and 30 at the center.

  In this example, the outer member 14 includes a bowl-shaped first outer member 32 that opens upward, and a flat plate-like second outer member 34 that covers the upper surface opening. A lower side wall portion 26 is formed, and an upper side wall portion 24 is formed by the second outer member 34.

  Specifically, as shown in FIG. 2, the first outer member 32 extends in a reverse-tapered cylindrical portion 22 formed with a slightly larger diameter toward the upper Xu, and an inward Yi flange shape at the lower end portion. The lower wall portion 26 provided and a lower flange 36 extending to the outer side Yo at the upper end of the cylindrical portion 22, for holding a bound stopper (not shown) on the lower surface side of the lower wall portion 26. A holding portion 38 is provided. The second outer member 34 includes an upper side wall 24 on the center side slightly raised through a step and an upper flange 40 on the outer peripheral side. The outer member 14 is fixed to the vehicle body panel 2 by overlapping the upper flange 40 and the lower flange 36 on the lower surface of the vehicle body panel 2 and fastening them with bolts 3 and nuts 4. ing.

  The elastic member 16 has a U-shaped cross section opened inwardly Yi so as to cover the upper surface 20A, the lower surface 20B and the outer peripheral surface 20C of the flange portion 20, and the upper surface 20A and the upper side wall portion of the flange portion 20 The annular upper elastic portion 42 held in the axial direction X between the lower surface 24A of the 24 and the lower surface 20B of the flange portion 20 and the upper surface 26A of the lower side wall portion 26 held in the axial direction X. An annular lower elastic portion 44 is provided.

  In this example, the upper elastic portion 42 is formed of a foamed urethane molded body having an open cell structure over the entire circumference, while the lower elastic portion 44 is sandwiched between the flange portion 20 and the lower side wall portion 26. A rubber elastic part 46 made of a pressure-held rubber material and a foamed resin elastic part 48 made of a foamed urethane molded body having an open cell structure are formed. As shown in FIG. 3C and FIG. 5C, the rubber elastic portion 46 is provided in plural (here, six pieces) alternately with the foamed resin elastic portion 48 in the circumferential direction C of the elastic member 16. In this example, the rubber elastic portion 46 and the foamed resin elastic portion 48 are set to be equal and the circumferential widths of both are set to be the same.

  As shown in FIG. 2, the upper elastic portion 42, the rubber elastic portion 46 of the lower elastic portion 44, and the foamed resin elastic portion 48 of the lower elastic portion 44 are separately molded. As shown in FIG. 4, the upper elastic portion 42 is an annular foamed urethane molded body having a constant thickness over the entire circumference in the circumferential direction C, and a shallow receiving recess that receives the flange portion 20 of the inner member 12 on the lower surface. 50.

  The rubber elastic portion 46 is vulcanized and formed integrally with the inner member 12 by being vulcanized and bonded to the flange portion 20 of the inner member 12. As shown in FIG. 3, the rubber elastic portion 46 is provided in a convex shape at a plurality of locations in the circumferential direction C on the lower surface 20 </ b> B of the flange portion 20 of the inner member 12. A protrusion 52 is provided for preventing a hitting sound with the side wall portion 26. In addition, the rubber layer 54 which continues from the rubber elastic body 46 is provided by vulcanization adhesion in a portion where the rubber elastic portion 46 is not provided in the upper surface 20A, the outer peripheral surface 20C, and the lower surface 20B of the flange portion 20. .

  As shown in FIG. 5, the foamed resin elastic portion 48 is formed in an integral annular shape as a whole by the outer peripheral portion being connected by an annular connecting portion 56. That is, the plurality of foamed resin elastic portions 48 are formed by molding urethane foam so as to have a shape protruding inward from the inner peripheral portion of the annular coupling portion 56. The circumferential width of the foamed resin elastic portion 48 is set so as to fit between the rubber elastic portions 46 without a gap. The height Hp of the foamed resin elastic portion 48 in the axial direction X is set to be larger than the height Hr of the rubber elastic portion 46 in the axial direction X so that a predetermined preliminary compression rate is given.

  As shown in FIG. 3C, the flange portion 20 is in contact with the inner peripheral edge 48 </ b> A (see FIG. 5C) of the foamed resin elastic portion 48 and is inwardly in the direction perpendicular to the axis of the foamed resin elastic portion 48. A restricting rubber portion 58 that restricts the displacement to is provided. The regulating rubber portion 58 is provided so as to protrude integrally with the rubber layer 54 in the circumferential direction sandwiched between the rubber elastic portions 46, and is formed in an elongated protrusion shape along the circumferential direction C.

  Reference numeral 60 denotes dents provided at predetermined intervals on the outer peripheral surface of the foamed resin elastic portion 48, and the dents 60 are convex portions provided at predetermined intervals in the circumferential direction in the cylindrical portion 22 of the outer member 14. The outer member 14 and the elastic member 16 are positioned in the circumferential direction C by being fitted to the unillustrated). Similarly, recesses 62 are provided at predetermined intervals in the rubber layer 54 covering the outer peripheral surface 20C of the flange portion 20.

  Further, a vertical wall portion 64 of the elastic member 16 is interposed between the outer peripheral surface 20C of the flange portion 20 and the cylindrical portion 22 over the entire circumferential direction. The vertical wall portion 64 is formed of a rubber layer 54 whose inner peripheral side covers the outer peripheral surface 20C of the flange portion 20, and the outer peripheral side integrally extends from the foamed resin elastic portion 48 of the upper elastic portion 42 and the lower elastic portion 44. The ring-shaped convex portions 66 and 68 (see FIGS. 4B and 5B) provided are formed by abutting each other.

  When the suspension support 10 is assembled, as shown in FIG. 2, the upper elastic portion 42 and the foamed resin elastic portion 48 are assembled from the upper and lower sides of the inner member 12 obtained by vulcanizing the rubber elastic portion 46. The outer member 32 is placed on the lower side wall portion 26, covered with the second outer member 34, and the upper end 1A of the piston rod 1 is inserted and fixed to the inner member 12 using the nut 5, and the first outer portion The flanges 36 and 40 of the member 32 and the second outer member 34 are overlapped on the lower surface of the vehicle body panel 2 and fastened and fixed using the bolt 3 and the nut 4. Accordingly, the upper elastic portion 42 and the lower elastic portion 44 are held in a state compressed in the axial direction X by the outer member 14. At that time, the foamed resin elastic portion 48 of the upper elastic portion 42 and the lower elastic portion 44 made of the urethane foam molded body is pre-compressed at a higher compression ratio than the rubber elastic portion 46.

  In the suspension support 10 configured as described above, the upper elastic portion 42 is composed only of a foamed urethane molded body, and the lower elastic portion 44 is a foamed resin elastic portion 48 composed of a rubber elastic portion 46 and a foamed urethane molded body. As shown in FIG. 6, the static spring constant at the time of displacement toward the upper Xu (that is, the bound side) and the static spring at the time of displacement toward the lower Xd (that is, the rebound side) as shown in FIG. A large difference from the constant can be taken. In FIG. 6, the curve shown by the two-dot chain line is a load-deflection curve when both the upper and lower elastic parts are foamed urethane molded bodies, whereas in the present embodiment, as shown by the solid line, on the rebound side The inclination of the load-deflection curve is remarkably large, and there is a large difference in inclination with the curve on the bounce side. By increasing the static spring constant on the rebound side in this way, it is possible to improve steering stability without impairing riding comfort.

  Further, by providing the rubber elastic portion 46, the foamed resin elastic portion 48 can be used in a region where the preliminary compression rate is low. If the pre-compression ratio is lowered, the static spring constant by the foamed resin elastic portion 48 is lowered. However, in this embodiment, the static spring constant can be supplemented by the rubber elastic portion 46. Therefore, while maintaining the static spring constant in the axial direction X, the foamed resin elastic portion 48 having a low precompression ratio can exhibit high damping characteristics, and ride comfort and steering stability can be improved. .

  Further, when an excessive displacement is input in the axial direction X, there is a concern about the impact sound between the rubber elastic portion 46 and the lower side wall portion 26. As described above, the rubber elastic portion 46 has the protrusion 52. In addition, since the foamed resin elastic portion 48 held in a compressed state exists between the rubber elastic portions 46, this also reduces the hitting sound.

  Further, since the restriction rubber portion 58 is provided on the flange portion 20, when the foamed resin elastic portion 48 is assembled to the rubber elastic portion 46 on the flange portion 20, the restriction rubber portion 58 causes the foamed resin elastic portion 48 to be perpendicular to the axis. Positioning in the direction Y can be ensured, and performance variations can be eliminated.

(Second Embodiment)
7 and 8 show a suspension support 10A and its components according to the second embodiment. In the second embodiment, the configuration of the restriction rubber portion 58 is different from that of the above embodiment.

  That is, in this embodiment, as shown in FIG. 7, the regulation rubber portion 58 is in contact with the inner peripheral edge 48 </ b> A over substantially the entire height of the foamed resin elastic portion 48 in the assembled state of the suspension support. It is formed in a wall shape protruding from the rubber layer 54. The height h1 of the wall-shaped regulating rubber portion 58 is larger than the height h2 of the protrusion 52 provided on the front end surface of the rubber elastic portion 46 as shown in FIG. It is preferable that the height is smaller than h3 (h2 <h1 <h3). Thereby, it is possible to reliably prevent the foamed resin elastic portion 48 from being displaced inwardly in the direction perpendicular to the axis Yi.

  Further, as shown in FIG. 8A, the regulation rubber portion 58 is connected to the rubber elastic portion 46 and formed over the entire circumference of the elastic member 16. By providing the rubber elastic portion 46 in this way, it is possible to improve the moldability of such a high wall-shaped regulating rubber portion 58. Other configurations and operational effects are the same as those of the first embodiment, and a description thereof will be omitted.

(Third embodiment)
FIG. 9 is a cross-sectional view of a suspension support 10B according to the third embodiment. The third embodiment differs from the first embodiment in that not only the lower elastic portion 44 but also the upper elastic portion 42 is composed of rubber and urethane foam.

  In other words, in the present embodiment, the upper elastic portion 42 is made of a rubber elastic portion 70 made of a rubber material held between the flange portion 20 and the upper side wall portion 24 and a foamed urethane molded body having an open cell structure. It is comprised with the foamed resin elastic part 72. FIG. The specific configurations of the rubber elastic portion 70 and the foamed resin elastic portion 72 of the upper elastic portion 42 are basically the same as the configurations of the rubber elastic portion 46 and the foamed resin elastic portion 48 of the lower elastic portion 44 described above. Yes, explanation is omitted.

  As described above, in this embodiment, since the upper and lower elastic portions 42 and 44 have a hybrid structure of the rubber elastic portions 70 and 46 and the foamed resin elastic portions 72 and 48, the bounce side and the rebound as in the first embodiment. Although the effect of increasing the difference in static spring constant from the side is not achieved, both the upper and lower elastic parts 42 and 44 are made of foamed resin elasticity while the rubber elastic parts 70 and 46 make up for the shortage of the static spring constant. The parts 70 and 48 can be used in a region where the preliminary compression rate is low, and high attenuation characteristics can be exhibited. Other configurations and operational effects are the same as those of the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
FIG. 10 is a bottom view of the inner member 12 to which the rubber elastic portion 46 constituting the suspension support according to the fourth embodiment is bonded by vulcanization. The fourth embodiment is different from the first embodiment in the configuration of the rubber elastic portion 46.

  In other words, in the present embodiment, the rubber elastic portions 46 constituting the lower elastic portion 44 are the first rubber elastic portions provided at two locations facing the first axis perpendicular direction Y1 across the axis of the inner member 12. 46A and the second rubber elastic portion 46B provided at other circumferential positions, and the circumferential width Wa of the first rubber elastic portion 46A is equal to the circumferential width Wb of the second rubber elastic portion 46B. Is set larger than. In this example, two second rubber elastic portions 46B are provided between the first rubber elastic portions 46A, and a total of four second rubber elastic portions 46B are provided in the second axis perpendicular direction Y2 orthogonal to the first axis orthogonal direction Y1. The second rubber elastic portion 46B is not provided. Further, the interval between the rubber elastic portions 46 with which the foamed resin elastic portion 48 is fitted (that is, the interval in the circumferential direction C) is the interval Db at the circumferential position opposite to the second axis perpendicular direction Y2. It is set larger than the distance Da at the position (Db> Da).

  In this way, by giving a difference in the circumferential width of the rubber elastic portion 46, it is possible to give directionality to the twisting characteristics. That is, in the first twisting direction K1 in which the axis of the inner member 12 is inclined in the first axis perpendicular direction Y1, the circumferential width Wa of the first rubber elastic portion 46A facing the first axis orthogonal direction Y1 is large. Large static spring constant. On the other hand, in the second twisting direction K2 in which the axis of the inner member 12 is inclined in the second axis perpendicular direction Y2, there is no rubber elastic portion 46 at a position facing the second axis perpendicular direction Y2, and the interval Db is also large. Therefore, the static spring constant is small.

  Accordingly, the amount of rubber by the rubber elastic portion 46 in the entire circumferential direction is secured, and the static spring constant in the axial direction X is secured, while the static in a specific direction (that is, the second twisting direction K2). The spring constant can be reduced. Therefore, for example, by mounting the second prying direction K2 so as to be the prying direction in the left-right direction of the vehicle, it is possible to improve ride comfort without sacrificing steering stability. Other configurations and operational effects are the same as those of the first embodiment, and a description thereof is omitted.

(Fifth embodiment)
11 to 15 show a suspension support 10C and its components according to the fifth embodiment. The fifth embodiment differs from the first embodiment in that an air chamber is provided in the upper elastic portion 42 and the rubber elastic portion 46.

  That is, in the present embodiment, each of the plurality of rubber elastic portions 46 of the lower elastic portion 44 is provided with a first air chamber 74 therein, and the first air chamber 74 is connected to the outside air via the throttle passage 76. It is provided in communication with. The throttle passage 76 is a passage having a flow resistance that has a small cross-sectional area so that when the first air chamber 74 expands or contracts, the air enters and exits with a phase delay with respect to the expansion and contraction. The sectional area (S) of the throttle passage 76 is not particularly limited, but is preferably S / V = 0.01 or less, more preferably S / V with respect to the volume (V) of the first air chamber 74. Is set within the range of 0.01 to 0.001.

  In order to form the first air chamber 74 and the throttle passage 76, the rubber elastic portion 46 is not vulcanized and bonded to the inner member 12, and as shown in FIG. 12 is attached. Specifically, an annular rubber molded body 78 in which a plurality of rubber elastic portions 46 are connected via the rubber layer 54 is vulcanized and molded, and an adhesive is applied from the lower surface 20B side of the flange portion 20 of the inner member 12. Use to fix. By adhering afterward, air can be prevented from leaking from places other than the throttle passage 76.

  The first air chamber 74 is formed between a recess 80 that is recessed downward on the upper surface 46U (see FIG. 12) of the rubber elastic portion 46 and the lower surface 20B of the flange portion 20. The recess 80 is formed in the shape of an elongated hole that is slightly elongated along the circumferential direction C (see FIG. 15). The throttle passage 76 is provided so as to communicate with the atmosphere on the inner peripheral side of the elastic member 16. In this example, as shown in FIGS. 12 and 15, the throttle passage 76 is formed on the upper surface 46 </ b> U of the rubber elastic portion 46. It is formed between the elongate concave groove 82 extending from the concave portion 80 in the direction perpendicular to the axis Yi and the lower surface 20B of the flange portion 20.

  In the present embodiment, a second air chamber 84 is provided inside the upper elastic portion 42 made of a foamed urethane molded body. The second air chamber 84 is not provided with a throttle passage as described above, and communicates with the outside air through open cells of the urethane foam molded body. As shown in FIG. 14, a plurality of the second air chambers 84 are provided independently from each other in the circumferential direction C of the upper elastic portion 42. In this example, the circumferential direction is the same as the first air chamber 74. Six pieces are provided at equal intervals in C, and are formed in the shape of a slightly elongated slot along the circumferential direction C.

  The second air chamber 84 is provided in a portion sandwiched between the flange portion 20 and the upper side wall portion 24 in the upper elastic portion 42. In this example, the second air chamber 84 is recessed upward on the lower surface 42A (see FIG. 13) of the upper elastic portion 42. It is formed between the formed recess 86 and the rubber layer 54 covering the upper surface 20 </ b> A of the flange portion 20.

  In the suspension support 10C of the present embodiment, when the inner member 12 is displaced upward Xu, the second air chamber 84 provided in the upper elastic portion 42 is compressed, and the first air chamber 84 passes through its own open bubbles. Air flows out. When the inner member 12 is displaced downward Xd from this state, the first air chamber 74 provided in the lower elastic portion 44 is now compressed, and the air in the first air chamber 74 flows out to the outside through the throttle passage 76. At the same time, in the upper elastic portion 42, the second air chamber 84 expands so that air flows. Next, when the inner member 12 is displaced upward Xu, the second air chamber 84 is compressed, and the first air chamber 74 of the lower elastic portion 44 is expanded, so that the first air chamber is passed through the throttle passage 76. Air flows into 74.

  In this way, when the inner member 12 is displaced up and down, the air chambers 84 and 74 provided in the upper elastic portion 42 and the lower elastic portion 44 expand and contract, so that air enters and exits through the open bubbles and the throttle passage 76. At that time, due to the flow resistance of the open bubbles and the throttle passage 76, a phase delay with respect to the input vibration occurs in the air in and out, and a damping effect is exhibited by the phase delay. Therefore, high attenuation performance can be exhibited. In particular, the rubber elastic portion 46 of the lower elastic portion 44 can obtain a low dynamic magnification high damping performance equivalent to urethane foam having an open-cell structure while being a rubber elastic body. Further, by providing the second air chamber 84 for the upper elastic portion 42 made of a urethane foam molded body, further high attenuation characteristics can be exhibited.

  Moreover, according to this embodiment, since the 1st air chamber 74 and the aperture | diaphragm | restriction channel | path 76 are provided by forming indentation in the contact surface 20B with the flange part 20 in the rubber elastic part 46, it is easy to mold. Manufacturing costs can be reduced. Other configurations and operational effects are the same as those of the first embodiment, and a description thereof will be omitted.

Sectional view of the suspension support according to the first embodiment (cross section corresponding to the line α-α in FIG. 3C) Exploded sectional view of the suspension support The figure of the inner member by which the rubber elastic part was fixed, (a) is a top view, (b) is sectional drawing, (c) is a bottom view Figure of the upper elastic part, (a) is a plan view, (b) is a sectional view, (c) is a bottom view The figure of a foamed resin elastic part, (a) is a top view, (b) is a sectional view, (c) is a bottom view A graph showing a load-deflection curve of the suspension support Sectional drawing of the suspension support which concerns on 2nd Embodiment (cross section equivalent to the beta-beta line of Fig.8 (a)) The figure of the inner member by which the rubber elastic part was fixed in 2nd Embodiment, (a) is a bottom view, (b) is sectional drawing. Sectional drawing of the suspension support which concerns on 3rd Embodiment The bottom view of the inner member by which the rubber elastic part which concerns on 4th Embodiment was fixed. Sectional drawing of the suspension support which concerns on 5th Embodiment Exploded sectional view of inner member and rubber elastic part in the fifth embodiment Exploded sectional view of the suspension support of the fifth embodiment The top view of the elastic member in a 5th embodiment The bottom view of the inner member by which the rubber elastic part in 5th Embodiment was fixed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Piston rod of shock absorber, 1A ... Upper end part 2 ... Body panel 10, 10A, 10B, 10C ... Suspension support 12 ... Inner member 14 ... Outer member 16 ... Elastic member 20 ... Flange part, 20A ... Upper surface, 20B ... Lower surface 24: upper side wall portion, 24A: lower surface 26: lower side wall portion, 26A ... upper surface 42 ... upper elastic portion 44 ... lower elastic portion 46, 70 ... rubber elastic portion, 46U ... upper surface (contact surface with flange portion)
48, 72 ... foamed resin elastic part, 48A ... inner peripheral edge 56 ... annular connecting part 58 ... regulating rubber part 74 ... first air chamber 76 ... first throttle passage 80 ... concave part 82 ... concave groove 84 ... second air chamber C ... Circumferential direction X ... Axial direction, Xu ... Upward, Xd ... Downward Y ... Axis perpendicular direction, Yo ... Outward side, Yi ... Inward

Claims (7)

An inner member in which an upper end portion of a piston rod of a shock absorber is inserted and fixed, an outer member surrounding the outer periphery of the inner member and attached to a vehicle body side, and an open cell structure interposed between the inner member and the outer member An annular elastic member made of a foamed resin molded body,
The inner member includes a flange portion that protrudes outward in the direction perpendicular to the axis of the piston rod,
The outer member includes a cylindrical portion including the elastic member, an upper side wall portion and a lower wall portion that are formed inward in a direction perpendicular to the axial direction at both axial end portions of the cylindrical portion and clamp the elastic member in the axial direction. A side wall,
The elastic member holds the upper elastic portion held between the upper surface of the flange portion and the lower surface of the upper side wall portion, and holds the pressure between the lower surface of the flange portion and the upper surface of the lower side wall portion. A lower elastic portion,
From at least one elastic part of the upper elastic part and the lower elastic part, a rubber elastic part sandwiched between the flange part and the upper side wall part or the lower side wall part, and the foamed resin molding Composed of foamed resin elastic part,
Suspension support characterized by that.   The suspension support according to claim 1, wherein a plurality of the rubber elastic portions are provided alternately with the foamed resin elastic portions in the circumferential direction of the elastic member.   The rubber elastic portion is provided in a convex shape at a plurality of locations in the circumferential direction on the upper surface or the lower surface of the flange portion, and the plurality of foamed resin elastic portions are provided integrally by connecting an outer peripheral portion with an annular connecting portion, The suspension support according to claim 2, wherein the flange portion is provided with a regulating rubber portion that abuts on an inner peripheral edge of the foamed resin elastic portion and restricts the displacement of the foamed resin elastic portion in the direction perpendicular to the axis.   The rubber elastic portion is provided at two locations facing in a direction perpendicular to the axis across the inner member and a plurality of circumferential positions other than the two locations. The suspension support according to claim 2, wherein a circumferential width is set to be larger than a rubber elastic portion at a circumferential position.   The suspension support according to claim 1, wherein an air chamber is provided inside the rubber elastic portion, and the air chamber is provided in communication with outside air through a throttle passage.   The air chamber is formed between a concave portion provided in a contact surface with the flange portion in the rubber elastic portion and the flange portion, and the throttle passage is formed with the flange portion in the rubber elastic portion. The suspension support according to claim 5, wherein the suspension support is formed between a concave groove extending inward in a direction perpendicular to the axis from the concave portion and the flange portion on the contact surface. One elastic part of the upper elastic part and the lower elastic part is composed of the rubber elastic part and the foamed resin elastic part, an air chamber is provided inside the rubber elastic part, and the air A chamber is provided in communication with the outside air through a throttle passage;
The other elastic part of the upper elastic part and the lower elastic part is formed of a foamed resin molded body having an open cell structure over the entire circumference, and communicates with the outside air through the open cell inside the other elastic part. An air chamber was provided,
The suspension support according to claim 1 or 2.

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