JP2011202720A - Vibration damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping device of special structure as a novel means for enhancing the rigidity of a vehicle without requiring a great increase in body weight and addition of a special reinforcing member.SOLUTION: The vibration damping device 10 including a fluid chamber 48 filled with a viscous fluid inside with at least a part of a wall part being formed of a rubber elastic body 16, is mounted between an opening/closing body 56 and a body 54 and elastically deformed abutting on the body 54 or the opening/closing body 56. An internal protrusion 50 is provided projecting into the fluid chamber 48 from a portion (28) formed of the rubber elastic body 16 in the wall part, and the moving direction of the internal protrusion 50 following elastic deformation is a direction different from the moving direction of an abutting part 25 toward the body 54 or the opening/closing body 56.

Description

  The present invention relates to a vibration damping device that holds an opening / closing body against a main body such as a white body in a closed state of the opening / closing body such as a door in an automobile.

  Conventionally, as a member provided between an opening / closing body such as a door and a body (a so-called white body excluding an opening / closing body such as a door) in a vehicle, disclosed in JP-A-2003-237379 (Patent Document 1) and the like. Weathered strips are known. This weather strip is interposed between the door and the body for the purpose of preventing rainwater and the like from entering the vehicle interior through the gap between the door and the body. It is designed to be pinched between the bodies.

  By the way, weatherstrip not only seals between the door and the opening edge of the body, but also functions as a shock absorber that absorbs shock when the door is closed, reducing sound and vibration when the door is opened and closed It has come to be.

  However, in the conventional weather strip, the dynamic damping performance is hardly taken into consideration, and the structure has no dynamic damping effect. Therefore, an opening / closing body such as a door is merely an addition to the body and cannot contribute to dynamic rigidity in the body. As a result, in order to improve the rigidity of the body, it is necessary to increase the weight of the body and to add a special reinforcing member such as a strut tower bar, etc., and the body rigidity can be improved with a simple structure. A mechanism was sought.

JP 2003-237379 A

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is to increase the rigidity of the vehicle without requiring a significant increase in the body weight or the addition of a special reinforcing member. As a new means, a vibration damping device having a special structure is provided.

  That is, the first aspect of the present invention includes a fluid chamber in which at least a part of the wall portion is formed of a rubber elastic body and in which a viscous fluid is sealed, and is mounted between the opening / closing body and the main body. In the vibration damping device that is elastically deformed in contact with the main body or the opening / closing body, an internal projection that projects into the fluid chamber from a portion formed of the rubber elastic body in the wall portion is provided, and is elastic The moving direction of the internal protrusion is different from the moving direction of the contact portion to the main body or the opening / closing body in accordance with the deformation.

  According to the first aspect, since the internal protrusion moves in a direction different from the contact portion to which the load is input, the internal protrusion is efficiently displaced greatly when the load is input. A damping effect based on the fluid friction of the viscous fluid sealed in the chamber is advantageously exhibited. As a result, a large damping effect can be expected even when a minute amplitude vibration is input, and an opening / closing body such as a door can act as a reinforcing member for a main body such as a white body with a high damping force. Therefore, it is not necessary to add a separate reinforcing member, and the dynamic rigidity of the main body such as a white body can be improved by making good use of an opening / closing body such as a door.

  In addition, since the shearing action of viscous fluid, the fluid friction effect by stirring, and the like are utilized, the intended damping effect is stably exhibited against input vibrations in a wide frequency range. Thus, in a wide frequency range, the dynamic rigidity of the main body can be improved by causing the opening / closing body such as the door to act as a reinforcing member against the dynamic deformation of the main body such as the white body.

  In addition, since the vibration damping device of the present invention can ensure sufficient flexibility and low damping against a static load, for example, when a seal member such as a weather strip is separately provided between the main body and the opening / closing body. However, adverse effects on the seal member and the like are avoided.

  According to a second aspect of the present invention, in the vibration damping device according to the first aspect, the internal protrusion is partially provided with respect to a portion formed of a rubber elastic body in the wall portion. .

  According to the second aspect, even when there is a difference in the input load due to variations in the mounting position or device size, the portion of the rubber elastic body where the internal protrusion is not provided is easily deformed. By being absorbed by the deformation, the intended damping effect is stably exhibited. In addition, for example, when closing an opening / closing body such as a door, even when an input load is different, problems such as difficulty in closing the opening / closing body such as a door are avoided.

  Furthermore, since the deformation of the non-formed portion can be facilitated as compared with the portion where the internal protrusion is formed, the region where the non-viscous fluid escapes when deformed so as to be crushed by the external force action is outside the non-formed portion of the internal protrusion. It becomes possible to ensure easily by the bulging deformation to the direction. In addition, by elastically bulging and deforming the non-formed part of the internal protrusion outward, the flow amount of the viscous fluid when the external force acts between the formed part and the non-formed part of the internal protrusion is more effectively It is possible to ensure the damping effect and further improve the damping effect based on the flow friction of the viscous fluid.

  According to a third aspect of the present invention, in the vibration damping device described in the first or second aspect, a portion formed of the rubber elastic body in the wall portion includes a pair of opposing side walls, and the pair of side walls. And at least one of the pair of side walls is different from the protrusion forming portion provided with the internal protrusion and the moving direction of the corresponding contact portion. And a deformation allowing portion that allows the movement of the internal protrusion in the direction.

  According to the third aspect, when the external force is input to the contact portion and the deformation allowing portion is deformed, the internal protrusion provided on the protrusion forming portion can be moved in a direction different from the direction of movement of the contact portion. I can do it.

  According to a fourth aspect of the present invention, in the vibration damping device according to the third aspect, the protrusion forming portion is connected to the input portion, and the internal protrusion provided in the protrusion forming portion is In addition to extending to the input portion, the deformation allowing portion is continuously provided on the opposite side of the protrusion forming portion to the input portion.

  According to the fourth aspect, the input portion and the protrusion forming portion are continuously provided on the side wall, and the internal protrusion extends from the protrusion forming portion to the input portion, so that the load is input to the contact portion. Thus, the internal protrusion can be moved efficiently from the initial stage where the input portion starts to deform. Therefore, the vibration damping action is effectively exhibited even when a vibration with a small amplitude is input.

  In addition, since the end of the internal projection opposite to the input portion can be moved greatly by the deformation of the deformation allowing portion, the vibration damping action based on the viscous resistance due to the movement of the internal projection in the viscous fluid is achieved. Effectively demonstrated.

  According to a fifth aspect of the present invention, in the vibration damping device according to any one of the first to fourth aspects, the wall portion has a longitudinal cylindrical peripheral wall extending in a constant section, and both longitudinal ends of the peripheral wall. And a plurality of the inner protrusions are formed at a predetermined interval in the length direction of the peripheral wall, and the inner protrusions are respectively disposed at opposing portions of the peripheral wall. The internal protrusions are provided in a staggered manner so as to overlap each other in the longitudinal projection of the peripheral wall, and the overlapping portions of the internal protrusions are located on the line of the external force acting on the contact portion. It is what you are doing.

  According to the fifth aspect, the narrowed region is formed in the overlapping portion of the adjacent internal protrusions, so that the fluid friction of the viscous fluid is ensured more and the damping action is more effectively exhibited.

  According to a sixth aspect of the present invention, in the vibration damping device according to any one of the first to fifth aspects, the wall portion has a longitudinal cylindrical peripheral wall extending in a constant cross section, and both longitudinal ends of the peripheral wall. A plurality of the inner protrusions are formed at a predetermined interval in the length direction of the peripheral wall, and a portion that supports the plurality of inner protrusions on the peripheral wall is formed. A restricting portion for restricting deformation of the peripheral wall is provided.

  According to the sixth aspect, when the dynamic load is input, the plurality of internal protrusions are constrained in a state where the relative displacement is restricted by the restricting portion and are integrally displaced. The viscous fluid enclosed in the chamber is agitated, and the damping effect due to fluid friction or the like is more efficiently exhibited.

  According to a seventh aspect of the present invention, in the vibration damping device according to any one of the first to sixth aspects, the connecting portion between the load input portion and the support portion of the internal protrusion in the wall portion is a load. An outwardly projecting shape is formed by deforming the support portion of the inner protrusion in the wall portion so as to open outward by input.

  According to the seventh aspect, when the load is input, the supporting portion of the internal protrusion in the wall portion is efficiently deformed, and a large amount of displacement of the internal protrusion is ensured. Therefore, a damping effect based on shear shearing is advantageous. To be demonstrated.

  According to an eighth aspect of the present invention, in the vibration damping device according to the seventh aspect, the cross-sectional shape of the load input portion in the wall portion is a curved shape.

  According to the eighth aspect, even when there is a variation in the input direction of the load due to a variation in the mounting direction, a shape error of the vibration damping device itself, a time-dependent deformation of the rubber elastic body in the vibration damping device, etc. By forming a wall portion having a contact portion to which a load is input with a curved cross section, variation in the load input direction can be allowed and the intended damping performance can be exhibited stably.

  According to a ninth aspect of the present invention, in the vibration damping device according to any one of the first to eighth aspects, the main body is a vehicle body and the opening / closing body is a vehicle door. And are mounted between the vehicle body and the door.

  According to the ninth aspect, the dynamic rigidity of the white body is effectively increased by using the door as a reinforcing member, and excellent maneuverability is realized by improving the body rigidity with respect to the roll.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration damping device which has the softness | flexibility with respect to a static load, the low damping performance, and the high damping performance with respect to a dynamic load is realizable. Therefore, while avoiding problems such as doors and other open / close bodies becoming difficult to close and adversely affecting the sealing mechanism, the dynamic load during travel is effectively attenuated, and doors and other open / close bodies are It can function as a reinforcing member for the main body. In particular, by making the movement direction of the internal protrusion different from the input direction of the load and ensuring a large amount of displacement of the internal protrusion efficiently, a damping action based on the fluid friction of viscous fluid can be achieved even when small amplitude vibration is input. Effectively demonstrated.

The perspective view which shows the vibration damping device as one Embodiment of this invention. The front view of the vibration damping device shown in FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. Sectional drawing which shows the integral vulcanization molded product which comprises the vibration damping device shown by FIG. VI-VI sectional drawing of FIG. VII-VII sectional drawing of FIG. FIG. VIII arrow view of FIG. Explanatory drawing which shows the mounting state to the vehicle of the vibration damping device shown in FIG. It is a figure explaining a deformation | transformation of the vibration damping apparatus shown by FIG. 1, Comprising: (a) shows the state before a deformation | transformation, (b) shows the state after a deformation | transformation. Explanatory drawing which shows the inside of the rubber elastic body of the deformation | transformation state shown by FIG.10 (b). Sectional drawing which shows the principal part of the vibration damping apparatus as another one Embodiment of this invention. Sectional drawing which shows the principal part of the vibration damping apparatus as another one Embodiment of this invention. Sectional drawing which shows the principal part of the vibration damping apparatus as another one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 4 show a vibration damping device 10 as an embodiment of the present invention. The vibration damping device 10 is constituted by an integrally vulcanized molded product 12 and a lid fitting 14.

  More specifically, the integrally vulcanized molded product 12 has a rubber elastic body 16 and a caulking metal fitting 18 as shown in FIGS. The rubber elastic body 16 is substantially thin as a whole, and has a longitudinal action wall portion 20 and end wall portions 22 integrally formed at both ends in the longitudinal direction (left and right direction in FIG. 2) of the action wall portion 20. It has.

  The working wall portion 20 is formed of a thin rubber extending in the longitudinal direction with a substantially constant U-shaped cross section, and the bottom wall portion (left end portion in FIG. 3) has an arc-shaped cross section that protrudes outward. The input unit 24 is used. Further, a contact portion 25 that extends linearly continuously in the longitudinal direction is provided at the center of the cross section of the input portion 24 (the center in the vertical direction in FIGS. 2 and 3). Thus, a load due to contact with a door 56 to be described later is input. The contact portion 25 refers to a contact portion of the input unit 24 with the door 56 and is the center of the input unit 24 in the present embodiment, but the vibration damping device 10 is mounted on the vehicle. It can be set at an arbitrary position in the input unit 24 according to the above.

  In addition, a pair of side walls 26 and 26 are integrally formed at both ends of the input unit 24 and extend in a tangential direction of the input unit 24 and are provided substantially parallel to each other. In other words, one end portions of the pair of side walls 26, 26 arranged to face each other are connected by the input unit 24. As shown in FIG. 6, the side wall 26 has a structure in which a protrusion forming portion 28, a deformation allowing portion 30, and a fixing portion 32 are connected in order from the input portion 24 side. In FIG. 6, A indicates the range of the protrusion forming portion 28, B indicates the range of the deformation allowing portion 30, and C indicates the range of the fixing portion 32. However, in the present embodiment, since the protrusion forming portion 28, the deformation allowing portion 30, and the fixing portion 32 are integrally formed of a rubber elastic body, they are not necessarily clearly distinguished.

  The projection forming part 28 has a thin and substantially flat plate shape, and the pair of projection forming parts 28a and 28b face each other with a predetermined distance therebetween, and one end of the pair of projection forming parts 28a and 28b. Are connected to both ends of the input unit 24. The deformation allowing portion 30 is a thin, substantially flat plate shape like the protrusion forming portion 28, and extends from the end of the protrusion forming portion 28 opposite to the input portion 24, and will be described later with an internal protrusion 50 and a restricting portion. It is provided at a position deviating from the formation site of 52. The fixing portion 32 is provided so as to extend from an end portion (left end in FIG. 3) opposite to the protrusion forming portion 28 in the deformation allowing portion 30, and is fixed to an end portion on the boundary side with the deformation allowing portion 30. The protrusion 34 is integrally formed, and the seal portion 36 is integrally formed at the end opposite to the deformation allowing portion 30.

  On the other hand, as shown in FIG. 5, the end wall portion 22 is formed of a thin rubber as a whole, the upper end portion has a hemispherical shell shape, and the lower end portion is similar to the working wall portion 20. The fixed portion 32 is provided, and an intermediate portion having a semi-cylindrical cross section is formed between the upper end portion and the lower end portion. The upper end portion, the intermediate portion, and the lower end portion are integrally connected, the longitudinal end opening of the input portion 24 of the working wall portion 20 is closed by the upper end portion of the end wall portion 22, and the working wall portion. The longitudinal end openings of the 20 side walls 26 are closed by the middle and lower ends of the end walls 22.

  A caulking metal fitting 18 is vulcanized and bonded to the rubber elastic body 16. The caulking metal fitting 18 is a high-rigidity member having a substantially rectangular annular shape as a whole, and has an annular stepped portion 38 that spreads perpendicularly to the main vibration input direction. Further, the caulking metal fitting 18 protrudes from the inner peripheral edge of the stepped portion 38 so as to be substantially orthogonal to the stepped portion 38 and extends from the outer peripheral edge of the stepped portion 38 to the opposite side of the fixed piece 40. The caulking piece 42 is integrally provided, and the adhering piece 40 is superimposed on the outer peripheral surface of the adhering portion 32 of the rubber elastic body 16 and vulcanized and bonded. Thus, the rubber elastic body 16 is formed as the integrally vulcanized molded product 12 provided with the caulking metal fitting 18. One caulking piece 42 is provided for each piece of the stepped portion 38, and the four caulking pieces 42 are separated from each other in the circumferential direction at the corner of the stepped portion 38.

  The fixing piece 40 of the caulking metal fitting 18 is fixed to the fixing portion 32 by being fixed in a state where the tip portion is embedded in the fixing protrusion 34 provided on the fixing portion 32 of the rubber elastic body 16. It is fixed to. Further, the seal portion 36 provided at the fixing portion 32 of the rubber elastic body 16 is vulcanized and bonded to the step portion 38 of the caulking metal fitting 18 and protrudes on the same side as the caulking piece 42.

  Further, a lid fitting 14 is attached to the integrally vulcanized molded product 12. The lid metal fitting 14 is a substantially square metal plate with rounded corners, and the peripheral part is bent to one surface side over substantially the entire circumference, whereby a reinforcing part 46 for increasing bending rigidity is provided. Is formed. Then, after the lid fitting 14 is inserted from the protruding tip side of the caulking piece 42 in the caulking fitting 18 and overlapped with the stepped portion 38 of the caulking fitting 18, the caulking piece 42 is bent and deformed, and the lid fitting 14 is The lid metal fitting 14 is fixed to the caulking metal fitting 18 by being sandwiched between the stepped portion 38 and the tip end portion of the caulking piece 42. In addition, the opening part by the side of the caulking metal fitting 18 in the action wall part 20 is covered with the cover metal fitting 14, and the longitudinal cylindrical surrounding wall is comprised. Moreover, the end wall of this embodiment is comprised by the end wall part 22 and a part of crimping metal fitting 18. FIG.

  Further, in the assembled state of the lid fitting 14 to the caulking fitting 18, the reinforcing portion 46 of the lid fitting 14 is directly superimposed on the stepped portion 38, and the inner periphery of the lid fitting 14 is stronger than the reinforcing portion 46. The portion is indirectly overlapped with the stepped portion 38 via the seal portion 36. Thereby, between the lid metal fitting 14 and the rubber elastic body 16, a fluid chamber 48 is formed in which a part of the wall portion is formed of the rubber elastic body 16 and is fluid-tightly closed to the outside.

  The fluid chamber 48 is filled with a viscous fluid. The viscous fluid sealed in the fluid chamber 48 is not particularly limited, but highly viscous silicone oil, a highly viscous dispersion system solution (colloidal solution) or the like is preferably employed, and the liquid is a granular material. Viscosity can be increased by mixing. Preferably, the viscous fluid sealed in the fluid chamber 48 has a kinematic viscosity in the range of 100,000 cSt to 1 million cSt. In this embodiment, the viscous fluid is added to the high viscosity silicone oil. A mixture of these is used.

  A plurality of internal protrusions 50 protrude from the fluid chamber 48. As shown in FIGS. 7 and 8, the internal protrusion 50 has a substantially constant isosceles trapezoidal cross section that becomes gradually narrower toward the protruding tip, and the protrusion forming portion 28 in the rubber elastic body 16. Are integrally formed. Further, one end (the left end in FIG. 3) of the internal protrusion 50 extends to the input unit 24 and is integrally formed with the input unit 24, and the other end (the right end in FIG. 3) extends to the deformation allowing portion 30. The end of the fluid chamber 48 is a free end and is provided partially with respect to the rubber elastic body 16 constituting the wall portion of the fluid chamber 48. That is, the internal protrusions 50 are respectively formed on the opposing inner surfaces of both side wall portions (side walls 26, 26) extending in the length direction in parallel with each other in the rubber elastic body 16 having a substantially bag structure in the opposite direction that opens downward. It is integrally formed with a size from the bottom portion (input portion 24) to the middle portion in the wall height direction (depth direction).

  In addition, a plurality of internal protrusions 50a protrude from one protrusion forming portion 28 of the rubber elastic body 16, and a plurality of internal protrusions 50b protrude from the other protrusion forming portion 28. The internal protrusion 50a and the internal protrusion 50b Have substantially the same cross-sectional shape. Furthermore, a plurality of internal protrusions 50 a and internal protrusions 50 b are formed at substantially constant intervals in the longitudinal direction of the working wall portion 20, and the plurality of internal protrusions 50 are provided in parallel.

  Further, the plurality of internal protrusions 50a and internal protrusions 50b are provided alternately, and as shown in FIGS. 7 and 8, the internal protrusions 50b and the internal protrusions 50b are adjacent to each other between the protruding tips of the internal protrusions 50b and 50b. The protrusion tip of the protrusion 50a is arranged so as to enter. Then, as shown in FIG. 7, the projecting tip portions of the inner protrusion 50a and the inner protrusion 50b overlap each other at a predetermined wrap margin: t. Further, the overlapping portion of the internal protrusion 50a and the internal protrusion 50b is an external force acting direction line (virtual line (surface) extending from the abutting portion 25 in the external force acting direction to the contact portion 25 described later. And is located on the one-dot chain line in FIGS. A gap d (see FIG. 4) between the adjacent internal protrusions 50a and 50b is set according to the viscosity of the viscous fluid sealed in the fluid chamber 48, the size of the internal protrusions 50, and the like, which will be described later. Due to the relative displacement between the inner protrusion 50a and the inner protrusion 50b, the inner protrusion 50a is set so small that the damping action based on the fluid friction of the viscous fluid is effectively exhibited.

  Further, as shown in FIGS. 1 to 3, 6, and 7, the pair of protrusion forming portions 28 a and 28 b are respectively provided with restricting portions 52. The restricting portion 52 is a rubber elastic body having a longitudinal block shape that protrudes on the opposite side to the internal protrusion 50, and is integrally formed with the protrusion forming portion 28. The restricting portion 52 has a substantially constant rectangular cross section and extends in the longitudinal direction of the rubber elastic body 16, and is continuously formed at least in the formation region of the internal protrusion 50 in the protrusion forming portion 28. In the formation part of such a restricting part 52, the protrusion forming part 28 is thickened, the deformation of the protrusion forming part 28 is restricted, and a plurality of internal protrusions 50 provided in parallel in the longitudinal direction are The relative displacement is restricted by the restricting portion 52.

  As shown in FIG. 9, the vibration damping device 10 having such a structure is such that the lid 14 is fixed to the peripheral edge of the door opening of the body 54, which is the main body, with bolts, clips, or the like. Therefore, it is disposed between a body 54 as a vehicle body and a door 56 as an opening / closing body. The vibration damping device 10 is mounted without being deformed in the opened state of the door 56, and when the door 56 is closed, the door 56 comes into contact with the input portion 24 of the rubber elastic body 16, and the load is applied. It is designed to be entered. Therefore, in the vibration damping device 10, the input portion 24 and the deformation allowing portion 30 of the thin rubber elastic body 16 are easily deformed with respect to the input of a static load. Attenuation is realized. Therefore, inconveniences such as difficulty in closing the door 56 can be avoided, and deterioration of the sealing effect by the seal member (weather strip) arranged in parallel with the vibration damping device 10 can be prevented. Note that the body 54 does not necessarily need to be configured as a single white body, and may include an accessory such as a garnish attached to the periphery of the door opening.

  On the other hand, when the automobile is running, the dynamic input vibration from the door 56 is effectively damped by the vibration damping device 10. That is, as apparent from FIGS. 10 and 11, in the vibration damping device 10, when a load directed rightward in FIG. 10 due to the vibration of the door 56 is input to the contact portion 25 of the input portion 24, As shown in FIGS. 10B and 11, the input unit 24 and the deformation allowing unit 30 are elastically deformed. Based on the elastic deformation of the input portion 24 and the deformation allowing portion 30, the internal protrusion 50 moves in a direction different from the load input portion (abutment portion 25), thereby damping based on the fluid friction of the viscous fluid. The effect has come to be demonstrated.

  More specifically, when a load is applied to the abutting portion 25 of the input unit 24 by being pressed by the door 56, the abutting portion 25 is substantially in the same direction as the acting direction of the load (the moving direction of the door 56). Move to the right (in FIG. 10). On the other hand, the input section 24 having a convex curved cross section on the outside is elastically deformed so as to be crushed by the action of a load, and in other words, the input sections 24 of the pair of protrusion forming sections 28a and 28b. The side end portions are displaced away from each other toward the outside in the facing direction of the pair of projection forming portions 28a and 28b. Further, the deformation allowing portion 30 is elastically deformed, and the end portion of the deformation allowing portion 30 on the projection forming portion 28 side is displaced in the same direction as both end portions of the input portion 24. As a result, the internal protrusion 50a and the internal protrusion 50b are displaced outwardly in the opposing direction (vertical direction in FIG. 10) of the pair of protrusion forming portions 28a and 28b, respectively, and are also slightly displaced in the inclination direction with respect to the load input direction. It has become. In particular, the free end (the right end in FIG. 10) of the internal protrusion 50a and the internal protrusion 50b is largely separated by the parallel movement and the twisting movement.

  As described above, the internal protrusion 50 is efficiently displaced greatly in accordance with the deformation of the rubber elastic body 16 due to the input of the load, and even with respect to the small amplitude vibration input from the door 56 side during traveling. In addition, an excellent damping effect using fluid friction or the like is effectively exhibited. Therefore, the door 56 functions as a reinforcing member for the body 54, and deformation such as twisting of the body 54 is restrained by the door 56. As a result, the dynamic rigidity of the body 54 is improved without requiring the addition of a special member using the door 56, and an improvement in maneuverability based on a reduction in rolls is realized.

  In particular, a load input part (contact part 25) is set in the input part 24 of the rubber elastic body 16, and when an external force is applied to the load input part, the side wall extends substantially in parallel from the upper bottom part toward the opening part. 26 and 26 are elastically deformed so as to be spaced apart from each other and bulge outward. Since the side projections 50a and 50b are formed on the side walls 26 and 26 so as to extend from the input portion 24 to the intermediate portion in the depth direction, The protrusions 50a and 50b are displaced relative to each other so as to open apart from each other toward both sides of the contact portion 25 with the contact portion 25 of the input portion 24 as the center. As described above, when the inner protrusions 50a and 50b are displaced in a direction away from the contact portion 25 in a direction different from the load input direction (a direction substantially orthogonal), the inner protrusions 50a and 50b accompanying the load input are changed. While avoiding crushing, it is possible to efficiently secure a large relative displacement amount of the internal protrusions 50a and 50b, and further improve the damping effect based on the flow of the viscous fluid. In addition, the contact portion 25 of the input portion 24 of the rubber elastic body 16 serving as the load input portion is formed so that the internal protrusions 50a and 50b on both sides overlap each other. The strength can also be improved.

  The increase in the amount of displacement of the internal protrusion 50 due to the displacement of the internal protrusion 50 in a direction different from the contact portion 25 also contributes to the deformation of the input portion 24 and the deformation allowing portion 30 due to the input of a load. . That is, when the input portion 24 and the deformation allowing portion 30 are crushed and deformed in the load input direction, the entire inner protrusion 50 is displaced outwardly in the opposing direction of the pair of protrusion forming portions 28a and 28b, and the inner protrusion 50 The end portion on the deformation allowable portion 30 side is displaced more greatly. As a result, the internal protrusion 50 moves so as to incline with respect to the moving direction of the contact portion 25 (displacement), so that the amount of displacement increases, particularly at the end on the deformation-permitting portion 30 side. An effective damping action is exhibited even with respect to amplitude vibration.

  Furthermore, the internal protrusions 50a and the internal protrusions 50b are alternately formed, and the protruding tips of the internal protrusions 50a and 50b overlap each other with a predetermined distance. As a result, a constricted region is formed between the tip portions of the internal protrusion 50a and the internal protrusion 50b, and the viscous fluid filled in the constricted region is displaced between the adjacent internal protrusion 50a and the internal protrusion 50b. As a result, a damping action based on shear shear or the like is more effectively exhibited between the internal protrusions 50a and the internal protrusions 50b.

  In addition, the plurality of internal protrusions 50a are restricted in relative displacement by the restricting portion 52a so as to be integrally displaced, and the plurality of internal protrusions 50b are restricted in relative displacement by the restricting portion 52b, It is designed to be displaced integrally. As a result, not all of the internal protrusions 50 are displaced, but all of the internal protrusions 50 are displaced to stir the viscous fluid, so that a damping action based on fluid friction of the fluid is more efficiently exhibited. The

  Moreover, in the vibration damping device 10, as described above, the damping action is exhibited by using the fluid friction of the viscous fluid sealed in the fluid chamber 48. The effective damping action is stably exhibited.

  Moreover, the input part 24 which abuts on the door 56 and inputs a load has an arcuate curved cross section that protrudes outward. Therefore, when a load is input, the input portion 24 is crushed and the end portions on the input portion 24 side of the pair of projection forming portions 28a and 28b are displaced in a direction away from each other. Thereby, the amount of displacement of the internal protrusion 50 protruding from the protrusion forming portion 28 is efficiently ensured, and the damping action due to the fluid friction of the viscous fluid is effectively exhibited. In addition, since the input portion 24 has an arcuate curved cross section that protrudes outward, a contact portion (load load) of the input portion 24 with the door 56 may be caused by a dimensional error or a mounting error of the vibration damping device 10. Even when a deviation occurs in the input direction), the deviation is allowed and the intended attenuation performance is stably exhibited.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the above embodiment, the internal protrusion 50 having a substantially isosceles trapezoidal cross section is shown, but the shape of the internal protrusion is not particularly limited. Specifically, the internal protrusions 60, 70, 80, etc. having the structure shown in FIGS.

  More specifically, the internal protrusion 60 shown in FIG. 12 has a substantially semicircular cross section as a whole, and gradually becomes narrower toward the protruding tip side. Also, as is apparent from FIG. 12, the internal protrusion 60a and the internal protrusion 60b are separated from each other in the opposing direction of the pair of protrusion forming portions 28a and 28b, and the protruding tip of the internal protrusion 60a and the internal protrusion 60b are separated from each other. The protruding tip does not overlap. Even such an internal protrusion 60 shown in FIG. 12 effectively exhibits a damping action based on fluid friction of viscous fluid.

  The internal protrusion 70 shown in FIG. 13 has an isosceles trapezoidal cross section in which the base end portion becomes narrower toward the protruding front end side, and the front end portion has a rectangular cross section whose width dimension is substantially constant. Furthermore, an intermediate protrusion 72 that protrudes outward in the width direction is integrally formed at the intermediate portion. The intermediate protrusion 72 has a protrusion height that gradually decreases toward the outside in the protrusion direction of the internal protrusion 70, and is configured by an inclined plane whose surface is inclined with respect to the protrusion direction of the internal protrusion 70. Even such an internal protrusion 70 shown in FIG. 13 effectively exhibits a damping action based on the fluid friction of viscous fluid. In addition, since the intermediate protrusion 72 is provided, the surface area of the internal protrusion 70 is increased, the frictional resistance due to the displacement of the internal protrusion 70 in the viscous fluid is increased, and the damping action is more effective. Is demonstrated.

  The internal protrusion 80 shown in FIG. 14 has an isosceles trapezoidal cross section in which the base end portion becomes narrower toward the protruding front end side, and the front end portion has a circular cross section. According to the internal protrusion 80 shown in FIG. 14 as described above, the damping action based on the fluid friction of the viscous fluid and the like is effectively exerted, and the tip portion has a circular cross section, thereby increasing the surface area. The damping action can be obtained more effectively.

  In addition, a plurality of internal protrusions are not necessarily formed, and only one internal protrusion may be provided. Furthermore, in the embodiment, the internal protrusion 50a is formed so as to protrude from the protrusion forming portion 28a and the internal protrusion 50b is formed so as to protrude from the protrusion forming portion 28b. You may form so that it may protrude only from any one protrusion formation part 28. FIG. Furthermore, when the internal protrusion 50a protrudes from the protrusion forming portion 28a and the internal protrusion 50b protrudes from the protrusion forming portion 28b, the internal protrusion 50a and the internal protrusion 50b do not need to be provided alternately.

  In the above embodiment, the restricting portion 52 is integrally formed with the rubber elastic body 16. However, the restricting portion is, for example, a hard member formed of a metal or the like separate from the rubber elastic body 16. The rubber elastic body 16 may be fixed. Thus, by making the restricting portion a separate member from the rubber elastic body 16, the deformation restricting action of the protrusion forming portion 28 by the restricting portion can be obtained more effectively, and the size of the restricting portion can be reduced. However, sufficient rigidity can be secured. In addition, a control part is not essential in this invention, and can also be abbreviate | omitted.

  In addition, it is desirable that the input portion to which the load is input has an outwardly convex curved cross-sectional shape as shown in the embodiment, for example. A bent cross-sectional shape that forms a mountain shape toward the outside can also be used.

  In the above embodiment, the viscous fluid sealed in the fluid chamber 48 is exemplified by a mixture of powdered particles in high viscosity silicone oil, but the type of viscous fluid is a specific example of the embodiment. It is not limited by.

  The vibration damping device of the present invention is not limited to the one mounted between the body of the automobile and the door, and is mounted between the main body requiring rigidity and the opening / closing body additionally attached to the main body and opened / closed. Just do it. In addition, the present invention provides not only a vibration damping device mounted between the body and the door for getting on and off, but also a vibration damping mounted between the body and the opening / closing body attached thereto, such as a trunk hood. It can be applied to the device. Moreover, it does not necessarily need to be attached to the main body side, and may be attached to the opening / closing body side so that the input unit comes into contact with the main body.

10: vibration damping device, 12: integrally vulcanized molded product, 14: lid fitting, 16: rubber elastic body, 20: working wall portion (portion formed of rubber elastic body in the wall portion of the fluid chamber), 22: end Wall part (part formed of rubber elastic body in wall part of fluid chamber), 24: input part (input part of load in wall part), 25: contact part, 26: side wall, 28: protrusion forming part (wall) 30: deformation allowing portion, 32: fixing portion, 48: fluid chamber, 50, 60, 70, 80: internal projection, 52: regulating portion, 54: body (main body), 56: Door (opening / closing body)

Claims (9)

The wall is provided with a fluid chamber in which at least a part is formed of a rubber elastic body and a viscous fluid is sealed therein, and is mounted between the opening / closing body and the body to be in contact with the body or the opening / closing body. In a vibration damping device that is elastically deformed,
An internal protrusion that protrudes from the portion formed of the rubber elastic body in the wall portion to the fluid chamber is provided, and the direction in which the internal protrusion moves along with the elastic deformation is applied to the main body or the opening / closing body. A vibration damping device characterized in that the direction is different from the moving direction of the contact portion.   The vibration damping device according to claim 1, wherein the internal protrusion is partially provided on a portion of the wall portion formed of a rubber elastic body. A portion formed of a rubber elastic body in the wall portion includes a pair of opposing side walls, and an input portion that connects the pair of side walls and is provided with the contact portion.
At least one of the pair of side walls includes a protrusion forming portion provided with the internal protrusion, and a deformation allowing portion that allows movement of the internal protrusion in a direction different from the moving direction of the contact portion. Item 3. The vibration damping device according to Item 2. The protrusion forming portion is connected to the input portion, the internal protrusion provided in the protrusion forming portion extends to the input portion, and
The vibration damping device according to claim 3, wherein the deformation allowing portion is continuously provided on the opposite side of the projection forming portion to the input portion.   The wall portion is composed of a longitudinal cylindrical peripheral wall extending in a constant cross section and a pair of end walls that closes openings at both ends in the longitudinal direction of the peripheral wall, and the internal projections extend in the length direction of the peripheral wall. A plurality of internal projections are formed at predetermined intervals, and the internal projections are provided to be opposed to each other on the peripheral wall, and the internal projections are alternately provided so as to overlap each other in the projection in the longitudinal direction of the peripheral wall. The vibration damping device according to any one of claims 1 to 4, wherein an overlapping portion of the internal protrusions is located on a direction line of an external force exerted on the contact portion.   The wall portion is composed of a longitudinal cylindrical peripheral wall extending in a constant cross section and a pair of end walls that closes openings at both ends in the longitudinal direction of the peripheral wall, and the internal projections extend in the length direction of the peripheral wall. 6. The device according to claim 1, wherein a plurality of portions are formed at a predetermined interval, and a restriction portion that restricts deformation of the peripheral wall is provided at a portion of the peripheral wall that supports the plurality of internal protrusions. Vibration damping device.   The connecting portion between the load input portion of the wall portion and the support portion of the internal protrusion is convex outward so as to deform the load portion so as to open the support portion of the internal protrusion outward of the wall portion. The vibration damping device according to claim 1, wherein the vibration damping device has a protruding shape.   The vibration damping device according to claim 7, wherein a cross-sectional shape of a load input portion in the wall portion is a curved shape.   The vibration damping device according to any one of claims 1 to 8, wherein the main body is a vehicle body and the opening / closing body is a door of the vehicle, and is mounted between the vehicle body and the door. .

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