JP2008111558A - Fluid filled system toe correct bush and suspension mechanism using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toe correct bush of a new construction which can compatibly attain a demand profile of both a riding comfortability and a maneuvering stability demonstrated under an attachment condition to a suspension mechanism by higher order. <P>SOLUTION: A first fluid chamber 294 and a second fluid chamber 296 are formed radially on both sides which sandwiched inner cylinder metallic ornaments 212, and an orifice passage 298 is formed which communicates with these fluid chambers 294, 296. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a toe collect bush which is a kind of a suspension bush of an automobile and a suspension mechanism using the same, and more particularly, to a torsion beam type rigid axle type suspension mechanism and to a body side of left and right trailing arms. A new structure of the toe collect bush mounted on the mounting site and a suspension of a new structure that is realized by adopting such a toe collect bush and that achieves a high degree of both vehicle stability and riding comfort. It relates to the mechanism.

  Conventionally, in a torsion beam type rigid axle type suspension mechanism in an automobile, as a kind of suspension bush mounted on a body mounting side of left and right trailing arms connected by a torsion beam (also referred to as a twist beam), As disclosed in JP-A-9-104212, JP-A-11-247914, JP-A-11-257396, JP-A-2000-74117, etc., An inner inclined portion that is inclined outward in the axial direction and protrudes obliquely outward in one radial direction is provided, and at one end portion in the axial direction of the outer cylindrical metal member, the inner cylindrical inclined portion is inclined outward in the axial direction. Projecting diagonally outward in the direction and separated from each other by a facing surface substantially parallel to the inner inclined portion. The outer side inclined portion is formed, while the rubber elastic body is interposed between the radially opposed surfaces of the inner shaft metal fitting and the outer cylindrical metal fitting to elastically connect the two metal fittings, and the inner side inclined portion and the outer side inclined portion. There is known a to-collect bush having a structure in which a to-collect rubber elastic body interposed between the opposing surfaces of the main body and elastically connecting them is integrally formed with the main rubber elastic body. In such a to-collect bush, the center axis (the center axis of the inner shaft bracket and the outer tube bracket) is the vehicle lateral direction, and the direction perpendicular to the axis from which the inner side and outer side inclined portions project is the vehicle longitudinal direction. The characteristics of the vehicle greatly affect the displacement of the trailing arm and the wheels when the vehicle is running. The characteristics of the toe collect bush are tuned so as to be demonstrated.

  And, the target characteristic in such a torsion beam type suspension mechanism is a high level of both vehicle ride comfort and handling stability. Generally, in order to improve vehicle ride comfort, in the vehicle longitudinal direction, While a low dynamic spring characteristic for shocking vibration of harshness that is applied when stepping over a step, etc. and a high damping characteristic for subsequent bull feeling vibration are required respectively, to improve vehicle handling stability, when a cornering load is input It is important to prevent or reduce oversteer due to lateral force steering by suppressing the amount of displacement of the suspension member in the vehicle longitudinal direction.

  However, in the conventional to collect bush, only the spring characteristics and the load-displacement characteristics in the central axis direction and the direction perpendicular to the axis are considered in designing and evaluating the characteristics. In other words, the design and evaluation of riding comfort is performed based on the softness of the spring characteristics in the direction perpendicular to the axis, while the design and evaluation of steering stability is performed in accordance with the hardness of the spring characteristics in the direction of the central axis and the direction of the central axis. This is based on the suppression of the amount of displacement in the direction perpendicular to the axis (toe correction amount) accompanying the input of.

Therefore, in the toe collect bush having a conventional structure, as described in the above-mentioned publication, etc., the main rubber elastic body is simply connected elastically between the radially opposed surfaces of the inner shaft member and the outer cylindrical member. The spring characteristics in the longitudinal direction of the vehicle are set softly by forming a pair of slits extending in the axial direction on both side portions opposed to each other across the inner shaft member in the direction perpendicular to the axis that is the longitudinal direction of the vehicle, while In the axial direction which is the direction, by adjusting the inclination angle of the inclined surfaces parallel to each other in the inner side inclined portion and the outer side inclined portion elastically connected by the to-collect rubber, the hardness of the spring characteristics in the central axis direction, It was merely adjusting the amount of displacement in the direction perpendicular to the axis (the amount of to collect) accompanying the input in the central axis direction.
JP-A-9-104212 Japanese Patent Laid-Open No. 11-247914 JP-A-11-257396 JP 2000-74117 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is both riding comfort and steering stability that are exhibited when mounted on the suspension mechanism. It is an object of the present invention to provide a novel structure of a toe-collect bush and a suspension structure of a novel structure using the same that can achieve the required characteristics in a higher level.

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

  That is, according to the first aspect of the present invention, the inner shaft member and the outer cylindrical member spaced apart from the inner shaft member are connected by the main rubber elastic body interposed between the radially opposed surfaces, At one end in the axial direction of the inner shaft member, an inner side inclined portion that is inclined outward in the axial direction and protrudes obliquely outward in the radial direction is provided, while at the one end in the axial direction of the outer cylindrical member The outer side inclined portion is inclined outward in the axial direction and protrudes obliquely outward in the radial direction, and is positioned opposite to the inner side inclined portion. The inner side inclined portion and the outer side are provided. In a to-collect bush in which a to-collect rubber elastic body is interposed between opposing surfaces of the inclined portion, the main rubber elastic body and the to-collect rubber elastic body are configured as an integral vulcanized molded product, and the inner shaft Member and said outer Between the radially facing surfaces of the cylindrical member, the inner shaft member is located on both sides sandwiched in the radial direction where the inner inclined portion protrudes, and a part of the wall portion is configured by the main rubber elastic body, respectively. The first fluid chamber and the second fluid chamber in which an incompressible fluid is sealed are formed, and at least one of the elasticities in the axial direction formed by the main rubber elastic body in the first and second fluid chambers A wall portion is formed including an inclined wall portion extending inclined from the inner shaft member toward the outer cylindrical member with respect to a radial line, and the first fluid chamber and the second fluid chamber are mutually connected. It is characterized in that an orifice passage communicating with is provided.

  In the fluid-filled toe collect bush having the structure according to this embodiment, the relative displacement between the first fluid chamber and the second fluid chamber is caused by the elastic deformation of the main rubber elastic body at the time of radial vibration input. A pressure change is generated, and fluid flow is induced between the fluid chambers through the orifice passage. Therefore, the orifice passage can be made to flow against vibrations that cause problems during traveling such as shocking vibrations of harshness and vibrations with a bull feeling by tuning the length and cross-sectional area of the orifice passage appropriately. Based on the resonance action of the fluid, it is possible to obtain an excellent vibration-proofing effect due to the low dynamic spring effect and the high damping effect, so that the riding comfort of the vehicle can be improved.

  Here, the effect based on the resonance action of the fluid can be effectively exhibited against dynamic vibration loads in the tuning frequency range, and can exhibit a low dynamic spring effect, etc. The adverse effect on the spring characteristics with respect to the input lateral force or the like can be reduced or avoided, and as a result, the steering stability can be maintained at a high level.

  In particular, in the fluid-filled to collect bush according to this aspect, since an inclined portion is provided on the elastic wall portion formed by the main rubber elastic body defining the fluid chamber, when vibration is input in the direction perpendicular to the axis. The piston effect of the elastic wall portion with respect to the fluid chamber can be effectively exhibited, and the free length of the elastic wall portion can be advantageously ensured, whereby the fluid chamber accompanying the deformation at the time of input of the axial perpendicular direction load. Thus, the volume change can be generated efficiently or positively. As a result, the amount of fluid flowing through the orifice passage between the first fluid chamber and the second fluid chamber at the time of vibration input in the direction perpendicular to the axis can be more advantageously secured, and based on the resonance action of such fluid. Therefore, the anti-vibration effect exhibited can be exhibited more effectively.

  Further, in this aspect, for example, with respect to the spring characteristics against dynamic loads such as harshness that occur when a vehicle steps over a step, etc., the fluid that is caused to flow through the orifice passage caused by the elastic deformation of the main rubber elastic body The anti-vibration effect based on the resonance action can be dominant and can be effectively demonstrated. On the other hand, the resonance action of the fluid has an adverse effect on the spring characteristics against a static load such as a lateral force generated during vehicle cornering. In other words, the spring rigidity of the to-collect rubber elastic body can be effectively exhibited.

  The orifice passage is formed, for example, through a partition wall made of a rubber elastic body of the main body that partitions the first fluid chamber and the second fluid chamber, or extends in the circumferential direction along the outer peripheral surface of the inner shaft member. Although it may be formed by a passage, it is preferably constituted by a passage formed so as to extend in the circumferential direction along the inner peripheral surface of the outer cylinder member, and thereby the passage length of the orifice passage. Therefore, the degree of freedom in tuning the orifice passage is improved.

  Further, the first fluid chamber and the second fluid chamber protrude from one side of the inner shaft member side and the outer cylinder member side toward the other side at a predetermined height, and the other end is projected on the protruding tip surface. A block-shaped stopper portion that is opposed to the side at a predetermined distance can be formed as necessary. By adopting such a stopper portion, it is possible to limit the relative displacement amount in the radial direction between the inner shaft member and the outer cylindrical member, and to improve the durability of the main rubber elastic body associated therewith.

  Note that the to-collect rubber in the present invention exhibits a to-collect function by being compressed and deformed by an axial load input between the inner shaft member and the outer cylinder member in a state of being mounted on the vehicle. In the state before the mounting state in which no load is input between the member and the outer cylinder member, it is not necessary that the compression force (pre-compression) by the drawing process or the like of the outer cylinder member is exerted on the to-collect rubber.

  Further, the second aspect of the present invention is the fluid-filled to collect bush having the structure according to the first aspect, wherein a metal sleeve is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body, and the metal sleeve An opening window is formed on each side of the main rubber elastic body that opens to the outer peripheral surface through the opening window on both sides of the inner shaft member in the radial direction, and the outer cylindrical member is formed on the metal sleeve. The first fluid chamber and the second fluid chamber are formed by externally fixing and covering the pocket portions in a fluid-tight manner. In the fluid-filled toe collect bush configured according to this embodiment, the first fluid chamber has a simple structure in which the pocket portion formed in the main rubber elastic body is fluid-tightly covered by the outer cylindrical member. And the second fluid chamber can be formed with excellent fluid tightness. In this aspect, in order to improve the fluid tightness of the fluid chamber, for example, a structure in which the seal rubber layer is vulcanized and bonded to the outer peripheral surface of the metal sleeve or the inner peripheral surface of the outer cylindrical member is advantageous. Can be adopted.

  Further, a third aspect of the present invention is a fluid-filled to collect bush having a structure according to the second aspect, wherein, in the metal sleeve, two opening windows are radially opposed to each other. In addition, a concave groove extending between the opening windows in the circumferential direction is formed in the outer circumferential surface so as to extend in the circumferential direction along the inner circumferential surface of the outer cylindrical member in the concave groove. Thus, the orifice passage is formed. In the fluid-filled to collect bush configured according to this embodiment, since the orifice passage is formed between the metal sleeve and the outer cylindrical member, the rigidity of the member forming the orifice passage is improved. By preventing the deformation of the orifice passage due to the input load, it is possible to stably obtain a vibration isolation effect based on the intended fluid flow action.

  Here, the orifice member forming the orifice passage may be employed separately from the metal sleeve and the outer cylinder member, thereby improving the degree of freedom in designing the orifice passage. Specifically, for example, a rigid block-shaped orifice member is fixedly disposed between the metal sleeve and the outer cylinder member, and the concave groove formed in the orifice member is covered with the metal sleeve or the outer cylinder member. A structure or the like in which an orifice passage is formed can be suitably employed.

  According to a fourth aspect of the present invention, in the fluid-filled to collect bush configured according to the second or third aspect, the outer inclined portion is integrally formed with the metal sleeve. , Feature. In such a fluid-filled to collect bush according to this embodiment, the main rubber elastic body and the compression rubber elastic body can be integrally formed.

  According to a fifth aspect of the present invention, there is provided a fluid-filled to collect bush configured according to any one of the first to fourth aspects, wherein the shaft in the first fluid chamber or the second fluid chamber is provided. The elastic wall portions on both sides in the direction are gradually extended outward in the axial direction from the inner shaft member toward the outer cylindrical member, and the inclination angle of the intermediate portion in the radial direction becomes the largest. It is characterized by having a substantially S-shaped curved cross-sectional shape. In the fluid-filled toe collect bush having the structure according to this aspect, the free length of the elastic wall portion can be more advantageously secured while securing the volume of the fluid chamber, whereby the fluid The piston effect of the elastic wall portion with respect to the chamber can be improved, and a pressure change accompanying elastic deformation of the elastic wall portion can be efficiently generated. In addition, this aspect is suitably employed particularly in combination with the second aspect, and thereby the pocket part can be expanded outward in the radial direction, so that the main rubber forming the pocket part The structure of the elastic vulcanization mold can be simplified, and good die-cutting workability can be realized.

  According to a sixth aspect of the present invention, there is provided a fluid filled to collect bush having a structure according to any one of the first to fifth aspects, wherein the inner side inclined portion and the outer side inclined portion are opposed to each other. An intermediate constraining member that is spaced apart from the opposing surfaces of the respective inclined portions is disposed, and the intermediate constraining member is vulcanized and bonded to the toe collect rubber. In the fluid-filled to collect bush configured according to this embodiment, an intermediate constraining member is disposed between the opposing surfaces of the inner side inclined portion and the outer side inclined portion, and vulcanized and bonded to the to collect rubber elastic body. In the to collect rubber elastic body itself, the compression direction, that is, the inner side and the outer side is maintained while maintaining the soft shear direction, that is, the spring characteristics in the protruding direction of the inclined portions on the inner side and the outer side. The spring characteristics in the opposing direction of the inclined portions on the side are set to be hard. As a result, it is possible to set a larger value of the main shaft spring ratio as the whole fluid-filled toe collect bush.

  In this aspect, the opposing surfaces of the inner side inclined portion and the outer side inclined portion connected by the to-collect rubber elastic body, the opposing surfaces of the inner side and the outer side, and the opposing surfaces of the intermediate restraint member are not necessarily mutually. For example, the thickness of the intermediate restraint member is partially or gradually changed in consideration of the spring characteristics required in various directions such as the elastic main shaft direction, torsional direction, and twisting direction. Thus, the distance between the opposing surfaces, in other words, the thickness dimension of the to-collect rubber elastic body can be set partially or gradually different.

  In addition, the size of the intermediate restraining member is set according to the required required characteristics and is not particularly limited. Preferably, each of the inner side inclined portion and the outer side inclined portion is opposed to each other. More than half of the area of the surface is set, and more preferably, it is disposed over substantially the entire area between the opposed surfaces of the inner side inclined portion and the outer side inclined portion. Thus, by sufficiently securing the size of the intermediate restraining member, it is possible to more advantageously ensure the main shaft spring ratio in the fluid-filled toe collect bush.

  Furthermore, the length of the intermediate restraining member in the protruding direction is preferably at least half the length of the to collect rubber elastic body, and may be a length penetrating the to collect rubber elastic body. Moreover, in order to improve the setting workability of the to-collect rubber elastic body to the vulcanization mold, a part of the intermediate restraint member is embedded in the to-collect rubber elastic body and partially protrudes to the external space. Although it is effective, the whole may be embedded and arranged in the to-collect rubber elastic body.

  Further, as the material of the intermediate restraint member, a rigid material having a rigidity higher than at least the to-collect rubber elastic body is used, and specifically, a synthetic resin material, a metal, or the like is preferably used. Further, in order to connect the toe collect rubber elastic bodies disposed on both sides of the intermediate restraining member, it is possible to provide a communication hole penetrating in the plate thickness direction. Therefore, it is possible to achieve pressure equalization during the vulcanization of the to-collect rubber elastic bodies on both sides which have been divided by the above, improvement of the adhesive strength, and the like. In addition, a plurality of intermediate restraint members can be disposed in the elastic body of the to-collect rubber.

  Further, the present invention provides a suspension mechanism in which a suspension member in which left and right trailing arms are connected by a torsion beam is connected to an automobile body in a vibration-proof manner so that both left and right side portions of the suspension member on the front side of the vehicle are provided. On the other hand, fluid-filled to collect bushes having a structure according to any one of the first to sixth aspects are respectively mounted, and the suspension member is attached to the body via the fluid-filled to collect bushes. And the center axis of the fluid-filled to collect bush on both the left and right sides is disposed in the vehicle left-right direction so that the first fluid chamber and the second fluid chamber are arranged in the vehicle front-rear direction. It also features a suspension mechanism that is positioned oppositely.

  In such a suspension mechanism structured according to the present invention, based on the characteristics as described above in each fluid-filled toe collect bush, for example, with respect to vibration in the vehicle front-rear direction that occurs when the vehicle steps over, etc. Since the low dynamic spring effect and the high damping effect can be exhibited on the basis of the resonance action of the fluid flowing through the orifice passage communicating with the first and second fluid chambers, the vehicle ride comfort can be further improved. It can be advantageously achieved.

  Here, each fluid-filled toe collect bush may be disposed with the radial direction in which each pocket portion is formed positioned in the vehicle front-rear direction and the inner side and outer side inclined portions positioned on the vehicle center side. Desirably, this makes it possible to efficiently generate pressure fluctuations in each fluid chamber, and advantageously secures an amount of fluid that can flow through the orifice passage. As a result, the low dynamic spring effect and the high damping effect based on the resonance action of the fluid flowing through the orifice passage can be obtained more efficiently.

  Further, in the suspension mechanism of this aspect, in each fluid-filled toe collect bush, it is possible to set the main shaft spring ratio large while ensuring a high level of vibration isolation performance in the vehicle longitudinal direction based on the fluid flow action. Based on such characteristics, the displacement due to the external force of the suspension member at the time of vehicle cornering can be controlled in a direction close to the lateral direction of the vehicle, and the lateral force steer can be advantageously suppressed. Thus, it becomes possible to achieve good steering stability of the vehicle while ensuring the riding comfort of the vehicle.

  As is clear from the above description, in the fluid-filled to collect bush configured according to the present invention, the resonance action of the fluid that is caused to flow in the orifice passage between the first fluid chamber and the second fluid chamber. Based on this, an effective anti-vibration effect is exerted against the dynamic vibration load input in the direction perpendicular to the axis, so that the spring rigidity against the axial load exerted between the inner shaft member and the outer cylinder member, and the toe Preventing adverse effects on the desired elastic main shaft characteristics exhibited by the collect rubber elastic body, preventing such vibrations exerted in the direction perpendicular to the axis, while ensuring the desired axial spring rigidity and elastic main shaft characteristics. The vibration performance can be improved.

  Further, in the suspension mechanism according to the present invention employing such a fluid-filled toe collect bush, it is input in a direction perpendicular to the axis while ensuring effective spring rigidity against an axial load input during cornering or the like. It is possible to obtain an effective anti-vibration effect based on the resonant action of the fluid against vibration during running such as harshness, which makes it possible to achieve both a high level of driving stability and ride comfort of the vehicle. is there.

  Hereinafter, a fluid-filled to collect bush 210 according to an embodiment of the present invention will be described with reference to the drawings. In the fluid-filled toe collect bush 210, an inner cylinder fitting 212 as an inner shaft member and an outer cylinder fitting 214 as an outer cylinder member are arranged radially apart from each other. A main rubber elastic body 216 is interposed between the two metal parts 214, and both the metal fittings 212 and 214 are elastically connected.

  More specifically, the inner tube fitting 212 has a thick and small-diameter cylindrical shape, and a substantially curved plate-shaped fixing plate 218 is provided near one end in the axial direction (left side in FIG. 1). It is fixed. The fixing plate 218 is formed of a press fitting or the like, has a substantially fan-shaped curved plate shape, and an arc-shaped fitting notch 220 is provided in the central portion of the sector. Then, the inner cylinder fitting 212 is inserted into the fitting notch 220, and the fitting notch 220 is welded to the inner cylinder fitting 212, whereby the fixing plate 218 is fixed to the inner cylinder fitting 212.

  Here, the fixed plate 218 has a substantially fan shape that becomes wider as the distance from the inner tube fitting 212 increases. The fixing plate 218 is inclined outward in the axial direction with respect to the central axis 222 of the inner tube fitting 212 to be radially The fixed plate 218 protrudes toward one side (upward in FIGS. 1 and 2), and the inclined outer surface of the fixed plate 218 extends substantially obliquely outward with a substantially constant inclination angle with respect to the central axis 222. An inclined surface (242). Further, the fixed plate 218 has a width (a horizontal dimension in FIG. 2) at the center thereof that is approximately between the outer diameter of the inner tube fitting 212 and the inner diameter of the outer tube fitting 214. The largest width dimension of the projecting tip portion is set to a size substantially close to the inner diameter dimension of the outer cylinder fitting 214. Note that the protruding front end surface (outer peripheral surface) of the fixed plate 218 has an arcuate shape with the central axis 222 of the inner cylinder fitting 212 being substantially the center.

  A pair of stopper portions 224 and 224 projecting radially outward are integrally formed in the radial direction near the other axial end (right side in FIG. 1) of the inner tube fitting 212. Has been. Each of the pair of stopper portions 224 and 224 has a substantially rectangular block shape protruding outward in the radial direction. Further, the width dimension of each stopper part 224 (the dimension in the left-right direction in FIG. 5) is substantially the same as the outer diameter dimension of the inner cylinder fitting 212, and the axial dimension of each stopper part 224 is the inner cylinder. It is made sufficiently smaller than the axial dimension of the metal fitting 212.

  Further, the protruding heights of the stopper portions 224 and 224 are different from each other, and neither of the stopper portions 224 and 224 has a height that does not reach the outer tube fitting 214, and one of them (in FIGS. 1 and 5). The protrusion height of the upper stopper portion 224 is approximately twice as large as the protrusion height of the other (lower portion in FIGS. 1 and 5) stopper portion 224. Further, the protruding front end surface of each stopper portion 224 is curved in the circumferential direction, and the radius of curvature thereof is substantially the same as the radius of curvature of the inner peripheral surface of the outer cylinder fitting 214.

  Further, in the present embodiment, a positioning notch 226 for indicating the radial direction in which the pair of stopper portions 224 and 224 are formed is formed on one end surface (right side in FIG. 1) of the inner cylinder fitting 212 in the axial direction. Has been.

  In addition, a thin-walled large-diameter cylindrical metal sleeve 228 is disposed on the concentric shaft at a predetermined distance outside the inner cylindrical metal fitting 212 in the radial direction. The axial length of the metal sleeve 228 is smaller than the axial length of the inner cylinder fitting 212, and both axial ends of the inner cylinder fitting 212 protrude axially outward from the metal sleeve 228. . Furthermore, a circumferential groove 230 is formed in the central portion of the metal sleeve 228 in the axial direction.

  The circumferential groove 230 has a concave groove shape opened on the outer peripheral surface of the metal sleeve 228, and is formed over the entire circumference of the metal sleeve 228 with a substantially constant cross-sectional area. Further, the length of the circumferential groove 230 in the width direction (the axial direction of the metal sleeve 228) is made smaller than the axial length of the metal sleeve 228. Large-diameter fitting portions 231 and 231 are formed. Furthermore, the depth dimension of the circumferential groove 230 is approximately 略 of the distance between the radially facing surfaces of the metal sleeve 228 and the inner tube fitting 212 in the present embodiment.

  In addition, a pair of opening windows 232 and 232 are formed at the axially central portion of the metal sleeve 228 so as to face each other in one radial direction. Each of these opening windows 232 and 232 has a rectangular shape, and is formed through the metal sleeve 228. In addition, each opening window 232 has a circumferential length that is approximately 1/3 of the circumferential length of the metal sleeve 228, and an axial length of the opening window 232 is equal to the axial length of the metal sleeve 228. It is approximately 3/5. The pair of opening windows 232 and 232 are positioned outward in the protruding direction of the pair of stopper portions 224 and 224.

  In addition, a flange-like portion 234 that protrudes outward in the radial direction and continuously extends in the circumferential direction is integrally formed on the peripheral edge portion of the opening in one axial direction (left side in FIG. 1) of the metal sleeve 228. . A part of the periphery of the flange-shaped portion 234 (the upper portion in FIGS. 1 and 2) is inclined in the axial direction and extended obliquely outward in the radial direction. An inclined plate facing portion 236 is formed that is spaced outwardly in the oblique axis direction with respect to the fixed plate 218 and is positioned substantially parallel to the fixed plate 218. The inclined plate facing portion 236 defines the metal sleeve 228. An inclined surface that is inclined at a substantially constant angle with respect to the central axis 238 is formed. Here, the radial direction in which the inclined plate facing portion 236 protrudes coincides with the radial direction in which the pair of opening windows 232 and 232 are formed.

  As is clear from this, in this embodiment, the inner side inclined portion is configured by the fixing plate 218 of the inner cylindrical metal fitting 212, while the outer side inclined portion is configured by the inclined plate facing portion 236 of the metal sleeve 228. It is configured. Further, the inclined plate facing portion 236 has a protruding tip end surface 240 having an arcuate surface having a diameter larger than that of the fixed plate 218 and a circumferential length sufficiently larger than that of the fixed plate 218. And it protrudes and is located in the circumferential direction both sides of the fixed plate 218. In the present embodiment, the opposing surfaces 242 and 244 of the fixed plate 218 and the inclined plate opposing portion 236 form inclined surfaces that face each other, and the opposing surfaces 242 and 244 are substantially parallel to each other. Has been.

  Further, as shown in FIG. 1, an intermediate restraint plate 246 as an intermediate restraint member is disposed between the fixed plate 218 and the facing surfaces 242 and 244 of the inclined plate facing portion 236. This intermediate constraining plate 246 is made of metal, and as shown in FIGS. 6 and 7, as a single unit, the curved plate shape of a circular arc plate having a substantially constant plate thickness as a whole is curved. It is inclined radially outward with respect to the central axis 222 of the inner tube fitting 212 and protrudes obliquely toward one side in the radial direction (upward in FIG. 1). Further, the distal end portion 248 in the protruding direction is bent in a radially outward direction and has a fan shape that becomes wider as it goes outward in the radial direction, while its proximal end portion will be described later. The to-collect rubber elastic body 258 is positioned. The protruding tip surface 250 of the tip portion 248 has an arc shape that is substantially centered on the central axis 222 of the inner cylinder fitting 212 and has a smaller diameter than the protruding tip surface 240 of the inclined plate facing portion 236. The intermediate constraining plate 246 is disposed at a central portion between the opposing surfaces 242 and 244 of the fixed plate 218 and the inclined plate opposing portion 236, and both the front and back surfaces 252 and 252 of the intermediate constraining plate 246 are fixed plates. 218 and the inclined plate opposing portion 236 are positioned so as to be parallel to the opposing surfaces 242 and 244, respectively. Further, as shown in FIG. 7, a plurality (5 in this embodiment) of communication holes 254 are provided in the intermediate restraint plate 246.

  A main rubber elastic body 216 is disposed between the radially opposing surfaces of the inner tube fitting 212 and the metal sleeve 228. The main rubber elastic body 216 has a thick cylindrical shape as a whole, and is interposed between substantially the entire radial facing surfaces of the inner tube fitting 212 and the metal sleeve 228. The outer peripheral surface of the main rubber elastic body 216 is vulcanized and bonded to the inner peripheral surface of the metal sleeve 228, and the inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner tube fitting 212. As shown in FIGS. 8 to 12, the main rubber elastic body 216 is formed as an integrally vulcanized molded product 256 having the inner tube fitting 212 and the metal sleeve 228.

  Further, the main rubber elastic body 216 also extends between the opposing surfaces of the fixed plate 218, the intermediate constraining plate 246, and the inclined plate facing portion 236, so that the fixed plate 218, the intermediate constraining plate 246 and the inclined surface are inclined. A to-collect rubber elastic body 258 filled over the entire opposing surfaces of the plate facing portion 236 is formed integrally with the main rubber elastic body 216. Further, the toe collect rubber elastic bodies 258 on both sides sandwiching the intermediate restraint plate 246 are connected to each other by the communication hole 254 of the intermediate restraint plate 246. Here, only the front end portion 248 in the protruding direction of the intermediate restraint plate 246 is protruded from the outer peripheral side end face of the to-collect rubber elastic body 258 over the entire circumference. On the other hand, the inner peripheral side proximal end portion of the intermediate restraint plate 246 is positioned so as to extend to the vicinity of the inner peripheral side end portion between the opposing surfaces 242 and 244 of the fixed plate 218 and the inclined plate facing portion 236. Furthermore, the main rubber elastic body 216 has an axial end on the side of the to-collect rubber elastic body 258 extending in the axial direction to the fixed plate 218 along the outer peripheral surface of the inner cylinder fitting 212. Continuously connected from the radially opposing surfaces of the metal fitting 212 and the metal sleeve 228 to the to-collect rubber elastic body 258 between the opposing surfaces 242 and 244 of the fixed plate 218 and the inclined plate opposing portion 236. Yes. A rubber layer 260 integrally extends from the main rubber elastic body 216 on the outer peripheral surface of the fixed plate 218, and the fixed plate 218 is covered with the rubber layer 260.

  In addition, a pair of pocket portions 262 and 262 are formed in the axial central portion of the main rubber elastic body 216 on both sides of the inner cylinder fitting 212 in the radial direction from which the fixed plate 218 and the inclined plate facing portion 236 protrude. ing. The pair of pocket portions 262 and 262 are formed to open on the outer peripheral surface of the main rubber elastic body 216, respectively. Here, the axial length of each pocket portion 262 is approximately ½ of the axial length of the main rubber elastic body 216, respectively. Further, the depth dimension of each pocket portion 262 is set so as not to reach the inner cylinder fitting 212 slightly, and the circumferential dimension of each pocket portion 262 is the length in the circumferential direction of the main rubber elastic body 216. It is approximately 1/3. The pair of pocket portions 262 and 262 are opened on the outer peripheral surface of the metal sleeve 228 through the pair of opening windows 232 and 232 in the metal sleeve 228, respectively.

  In addition, a stopper portion 224 protrudes from the center of the bottom surface of the pocket portion 262 at a height that does not reach the opening window 232, and the surface of the stopper portion 224 is integrated with the main rubber elastic body 216. The rubber cushion layer 264 is formed by the rubber layer extending to the surface. In the coated cushioning rubber layer 264, the portion covering the protruding front end surface of the stopper portion 224 is thicker than the portion covering both the axial end surfaces and the circumferential end surfaces, Although not clearly shown in the drawing, the surface has protrusions formed on the entire surface.

  Here, the rubber wall portion 266 in one axial direction (right side in FIG. 1) of the pocket portion 262a formed on the fixed plate 218 side has a substantially constant wall thickness throughout, and has a high height. The base end portion and the tip end portion in the vertical direction (radial direction) extend substantially in the radial direction, but the intermediate portion in the height direction is inclined to extend outward in the axial direction as going outward in the radial direction. As a whole, it has a gentle, substantially S-shaped curved cross-sectional shape. The rubber wall portion 266 is sufficiently separated in the axial direction from the stopper portion 224 protruding in the pocket portion 262 so that interference with the stopper portion 224 during elastic deformation is avoided. Yes. Further, the radially outer tip portion of the rubber wall portion 266 is vulcanized and bonded to the inner peripheral edge portion of the opening window 232 in the metal sleeve 228, and radially inward from the inner peripheral edge portion of the opening window 232. Projected. In the present embodiment, the angle formed by the central portion in the height direction of the rubber wall portion 266 and the central axis 222 of the inner cylinder fitting 212 is approximately 45 degrees. Further, the rubber wall portion on the other side in the axial direction of the pocket portion 262 (toe collect rubber elastic body 258 side) has a vertical surface shape that extends substantially perpendicularly to the central axis 222 of the inner tube fitting 212 throughout. Yes.

  The rubber wall portions 266 and 266 on both sides in the axial direction of the other pocket portion 262b also have a substantially constant wall thickness over the entire surface in the same manner as the rubber wall portion 266 described above, and in the height direction ( (Radial direction) the proximal end portion and the distal end portion extend substantially in the radial direction, but the intermediate portion in the height direction is inclined so as to extend outward in the axial direction as going outward in the radial direction, The overall shape is a gentle, substantially S-shaped curved cross-sectional shape. The two rubber wall portions 266 and 266 have a relative shape that is axially separated from each other as they go radially outward, thereby forming between the opposing surfaces of the two rubber wall portions 266 and 266. The formed pocket portion 262b has a shape that expands toward the outer peripheral surface side.

  As is clear from these facts, in the present embodiment, the elastic wall portion is constituted by the rubber wall portions 266 constituting the axial wall portions of the pocket portions 262a and 262b.

  A circumferential groove 230 formed in the metal sleeve 228 and extending in the circumferential direction across the pair of pocket portions 262a and 262b is filled with a seal rubber 268 integrally formed by the main rubber elastic body 216. . Further, a fitting recess 270 is formed in the circumferential groove 230 extending across one circumferential direction of the pocket portions 262a and 262b, extending from the one pocket portion 262a side in the circumferential direction over a substantially half circumference. ing. On the other hand, a communication groove 288 that extends in the circumferential direction across both pocket portions 262a and 262b is formed in the portion of the circumferential groove 230 that extends across the other circumferential direction of the pocket portions 262a and 262b. Has been. Note that a slight step portion is formed on the bottom wall surface of the central portion in the longitudinal direction of the communication concave groove 288 for positioning the orifice fitting (274), which will be described later, in the circumferential direction. The pair of pocket portions 262 a and 262 b are connected to each other at the opening windows 232 and 232 formed in the metal sleeve 228 by the communication concave groove 288. A seal lip 272 is provided on the outer peripheral surface of the seal rubber 268 so as to extend in the axial direction of the seal rubber.

  Further, in such an integrally vulcanized molded product 256 of the main rubber elastic body 216, the orifice fitting 274 is assembled on the outer peripheral surface, and further on the outer peripheral surface of the orifice fitting 274, the outer cylinder fitting 214 is further provided. Are assembled to the metal sleeve 228 in an externally fitted state. As shown in FIG. 5, the orifice fitting 274 has a substantially semicircular block shape. The orifice fitting 274 is assembled from one side in the radial direction of the integrally vulcanized molded product 256, and is disposed across one opening window 232 (opening window on the pocket portion 262a side) of the metal sleeve 228 in the circumferential direction. Has been. The orifice fitting 274 is positioned and fixed in the circumferential direction and the axial direction by fitting both end portions in the circumferential direction into the fitting recess 270 and the communication recess groove 288.

  Here, as shown in FIG. 5, the orifice fitting 274 has a circumferential length of approximately half the circumference of the metal sleeve 228, and the other end of the metal fitting 274 is located near one end on the outer peripheral surface. A concave groove 276 extending continuously to the end is formed. The concave groove 276 is opened at one circumferential end surface of the orifice fitting 274 and, at the other circumferential end (dead end), penetrates the bottom wall portion to the inner circumferential surface of the orifice fitting 274. An open communication hole 278 is formed. Through the communication hole 278, one end of the groove 276 is opened and communicated with the pocket portion 262a. Further, the other end portion of the concave groove 276 is communicated with the other pocket portion 262 b through the communication concave groove 288.

  As shown in FIG. 13, axial projections 280 and 280 that project toward both sides in the axial direction are integrally formed at a substantially central portion in the circumferential direction of the orifice fitting 274. These axial protrusions 280 and 280 are formed to have a circumferential dimension smaller than the circumferential dimension of the opening window 232, and in this embodiment, the circumferential length of approximately one third of the opening window 232. Is formed. Further, the protruding height of the axial protrusion 280 is such that the distance between the protruding front end surfaces of the both axial protrusions is slightly smaller than the axial length of the opening window 232.

  The orifice fitting 274 assembled to the integrally vulcanized molded product 256 has the protruding tip surfaces of the axial projections 280 and 280 on both sides substantially in contact with the axially inner end surfaces of the metal sleeve 228, respectively. Has been. In particular, in the present embodiment, the protruding front end surfaces of the axial protrusions 280 and 280 of the orifice metal fitting 274 are provided on the opening window 232 via the seal rubber 268 covering the inner peripheral surface of the opening window 232 of the metal sleeve 228. It is in contact with the axial end face. As a result, the metal sleeve 228 is directly connected to each other at both ends in the axial direction divided by the opening window 232 via the orifice fitting 274 fitted between them.

  Further, both end portions in the circumferential direction of the orifice fitting 274, in other words, portions where the axial protrusions 280 and 280 are not formed have an axial width smaller than the axial length of the opening window 232, thereby On both sides of the opening window 232 in the circumferential direction, pocket openings 282 that allow the pockets 262 to open on the outer peripheral surface of the metal sleeve 228 are formed on both sides of the orifice fitting 274. That is, in the present embodiment, such pocket openings 282 are formed at the four corners of the opening window 232, respectively.

  On the other hand, as shown in FIG. 1, the outer cylinder fitting 214 has a thin large-diameter cylindrical shape, and the orifice fitting 274 is assembled to the integrally vulcanized molded product 256 of the main rubber elastic body 216. After being extrapolated after attachment, the diameter is reduced by an eight-way stop or the like, so that the metal sleeve 228 and the orifice fitting 274 are fitted and fixed to the outer peripheral surface. That is, the orifice fitting 274 is fixedly attached to the metal sleeve 228 by the outer cylinder fitting 214. A thin seal rubber 292 is vulcanized and bonded to the inner peripheral surface of the outer cylinder fitting 214 over almost the entire surface, and the seal rubber 292 allows the gap between the fitting surface of the metal sleeve 228 and the outer cylinder fitting 214 and The fitting surfaces of the orifice fitting 274 and the outer cylinder fitting 214 are sealed in a fluid-tight manner, respectively.

  Then, the orifice fitting 274 and the outer cylinder fitting 214 are assembled to such an integrally vulcanized molded product 256 of the main rubber elastic body 216 so that the openings of the pair of pocket portions 262a and 262b are fluid-tight. It is covered with. Thereby, in one pocket part 262b, a first fluid chamber 294 in which a part of the wall part is constituted by the main rubber elastic body 216 (rubber wall part 266) is formed, and in the other pocket part 262a, A second fluid chamber 296 is formed in which a part of the wall portion is constituted by the main rubber elastic body 216 (rubber wall portions 266 and 266). Furthermore, incompressible fluid is sealed in the first and second fluid chambers 294 and 296, respectively. As such an incompressible fluid, water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is employed. In order to advantageously obtain a vibration isolation effect based on the resonance action of the fluid described later, in this embodiment, the viscosity A low-viscosity fluid having a viscosity of 0.1 Pa · s or less is preferably employed. The first and second fluid chambers 294 and 296 change the internal pressure based on the elastic deformation of the main rubber elastic body 216 when a radial vibration is input in which the first and second fluid chambers 294 and 296 are formed. Can be born.

  The incompressible fluid is sealed in the first and second fluid chambers 294 and 296 by, for example, assembling the main rubber elastic body 216 with the integrally vulcanized molded product 256 in the incompressible fluid. In addition, for example, after such assembling is performed in the atmosphere, an incompressible fluid is filled through an injection hole penetrating the outer tube fitting, and then the injection hole is sealed with a sealing rivet or the like. It can also be done by closing or by inserting an injection needle or the like into the main rubber elastic body 216 and filling an incompressible fluid through the injection needle. Note that a seal rubber 292 is sandwiched between the fitting surfaces of the metal sleeve 228 and the outer cylinder fitting 214, and the fluid tightness of the first and second fluid chambers 294, 296 is improved.

  Furthermore, the recessed groove 276 formed in the orifice fitting 274 is fluid-tightly covered by the assembly of the outer cylinder fitting 214, and the orifice passage 298 that communicates the first and second fluid chambers 294 and 296 with each other is formed. Is formed. The outer peripheral surface of the orifice fitting 274 is fluid-tightly contacted with the metal sleeve 228 and the outer cylindrical fitting 214 via the seal rubbers 268 and 292, whereby the first through the gap on the outer peripheral surface of the orifice fitting 274. The short circuit between the fluid chamber 294 and the second fluid chamber 296 is prevented.

  In addition to the wall spring rigidity of the first and second fluid chambers 294 and 296, the orifice passage 298 has a respective passage length and passage cross-sectional area in consideration of the density of the enclosed incompressible fluid and the like. By setting appropriately, the vibration isolation effect based on the resonance action of the fluid flowing through the inside is tuned so as to be effectively exhibited against the vibration in the target frequency range. In the present embodiment, the orifice passage 298 has a high attenuation with respect to harshness (bull feeling) vibration corresponding to vibration in the frequency range of 14 to 16 Hz, based on the resonance action of the fluid that flows inside the orifice passage 298. It is tuned so that the vibration isolation effect is demonstrated.

  Further, in the first and second fluid chambers 294 and 296, the protruding tip end surface of the stopper portion 224 provided on the inner cylinder fitting 212 side faces the outer cylinder fitting 214 or the orifice fitting 274 with a predetermined distance therebetween. By being brought into contact with the outer cylinder fitting 214 directly or indirectly via the orifice fitting 274 via the covering cushioning rubber layer 264 covering the surface of the stopper portion 224, the inner The relative displacement amount in the direction perpendicular to the axis of the tubular fitting 212 and the outer tubular fitting 214 is limited in a buffering manner. In the present embodiment, since the embossed protrusion is provided over the entire surface of the covering cushioning rubber layer 264 that covers the protruding front end surface of the stopper portion 224, the stopper portion 224 can be The contact sound when contacting the orifice fitting 274 is reduced or prevented.

  Then, as shown in FIG. 14, the fluid-filled toe collect bush 210 having the above-described structure includes, for example, a pair of trailing arms 98 and 98 that support the left and right wheels in the vehicle width direction. A pair is assembled to the torsion beam suspension mechanism that is connected and fixed to each other by the extending torsion beam 100. That is, the outer cylinder fitting 214 is press-fitted and fixed to the mounting holes extending in the vehicle lateral direction formed in the vehicle front end portions of the left and right trailing arms 98, 98, while the inner cylinder fitting 212 is fixed to the rod or the like. 14, the vehicle is mounted in a state in which the left-right direction is the vehicle left-right direction and the up-down direction is the vehicle front-rear direction in FIG. Further, at the leading end portion of each trailing arm 98, the fixed plate 218 of the inner cylinder fitting 212 and the inclined plate facing portion 236 of the outer cylinder fitting 214 are respectively positioned inward in the vehicle width direction, and are oblique to the vehicle. They are mounted symmetrically with respect to each other across an axis of symmetry XX extending in the vehicle front-rear direction so as to protrude forward.

  In the present embodiment, one end (right side in FIG. 1) in the axial direction of the cylindrical portion of the outer tube fitting (214) is slightly reduced in diameter as compared with the other end. Thereby, workability when attaching the outer cylinder fitting (214) to the mounting hole of the trailing arm 98 is improved.

  Under such a mounted state, for example, when the vehicle steps over the vehicle, each fluid-filled toe collect bush 210 has a force F exerted from the tires 102, 102 in the vehicle front-rear direction to the center axis. In the vertical direction, an external force f is exerted between the inner and outer cylindrical fittings (212, 214). And by this external force: f, the main rubber elastic body (216) and the toe collect rubber elastic body (258) are elastically deformed, so that the inner and outer cylindrical metal fittings (212, 214) are relatively displaced, The entire suspension member 104 is displaced relative to the vehicle body.

  Then, in such a mounted state, in the fluid-filled toe collect bush 210 of the present embodiment, vibration is input in the radial direction that is the vehicle front-rear direction, and the main rubber elastic body 216 is elastically deformed, whereby the first A relative pressure change occurs between the first fluid chamber 294 and the second fluid chamber 296, and fluid flow through the orifice passage 298 is caused between the two fluid chambers 294 and 296. As a result, a high damping effect based on the resonance action of the fluid that can flow through the orifice passage 298 is exhibited, and it is possible to obtain excellent vibration-proofing performance against the bull-feel vibration that occurs after climbing over the step. Thus, the riding comfort of the vehicle can be improved. In addition, since the high damping effect based on the resonance action of the fluid flowing through the orifice passage 298 can be effectively exerted against dynamic vibration of the bull bull, the lateral force input at the time of cornering is substantially reduced. The adverse effect on the spring characteristics with respect to the static load can be reduced or avoided, so that the steering stability can also be maintained to a high degree.

  In particular, in the fluid-filled to collect bush 210 of the present embodiment, one axial wall portion of the first fluid chamber 294 and two axial wall portions of the second fluid chamber 296 are formed as described above. Since the rubber wall portions 266 and 266 are curved in a specific shape, the free length is advantageously ensured, and the deformation is easy to deform with respect to the load perpendicular to the axis. The volume change can be generated efficiently or positively. As a result, it is possible to advantageously ensure the amount of fluid flowing through the orifice passage 298 between the first fluid chamber 294 and the second fluid chamber 296 when the vibration is input in the longitudinal direction of the vehicle. The high attenuation effect exhibited based on the above can be exhibited more advantageously.

  Further, for example, with respect to spring characteristics with respect to dynamic loads such as shock vibration generated when the vehicle is stepped over as a harshness or the like, and subsequent bull feeling vibration, the main body rubber elastic body 216 is dominant, and the orifice passage The anti-vibration effect based on the resonance action of the fluid capable of flowing 298, particularly in this embodiment, the anti-vibration effect due to the high damping against the bull feeling vibration can be effectively exhibited, while the lateral force generated at the time of vehicle cornering With respect to the spring characteristics with respect to static loads such as the above, since the to-collect rubber elastic body 258 is dominant, the angle formed between the elastic main shaft in the compression direction and the central axis of the fluid-filled to-collect bush 210 is reduced. The spring characteristic in the longitudinal direction of the vehicle can be sufficiently softened and excellent riding comfort can be exhibited.

  Further, in the fluid-filled toe collect bush 210 of the present embodiment, the pair of pocket portions 262a and 262b are formed in the main rubber elastic body 216 in the radial direction that is the vehicle longitudinal direction. Since the rubber volume compressed / tensile deformed by the load is reduced and the spring characteristics in the longitudinal direction of the vehicle are softened, the excellent riding comfort can be exhibited more advantageously.

  In addition, since the fluid-filled toe collect bush 210 of the present embodiment includes the intermediate restraint plate 246 that is vulcanized and bonded to the to collect rubber elastic body 258, the ride comfort of the vehicle by the intermediate restraint plate 246 can be reduced. A higher level of handling stability can be achieved.

  Incidentally, FIG. 15 shows an example of the results of measuring the vibration isolating performance of the suspension mechanism equipped with the fluid filled toe collect bush 210 as described above. In such measurement, as shown in FIG. 14, after mounting the fluid-filled to collect bush 210 in the mounting hole of the trailing arm 98, the suspension mechanism is equivalent to stepping over the step in the vehicle longitudinal direction. The time-dependent change of the vibration transmission force in the vehicle longitudinal direction was measured by applying a shocking vibration load. Note that the same measurement was performed for a suspension mechanism equipped with a toe collect bush having a conventional structure without a fluid chamber, as described in JP-A-9-104212, etc. As shown in FIG.

  As is clear from the measurement results shown in FIG. 15, the example can suppress vibrations in a shorter time than the comparative example, and can exhibit excellent anti-vibration performance against harshness. Is recognized.

  As described above, the fluid-filled to collect bush as one embodiment of the fluid-filled toe collect bush according to the present invention has been described in detail. However, this is merely an example, and the present invention is a specific example in the embodiment. The description is not intended to be construed as limiting.

  For example, the inner shaft member and the outer cylinder member may be eccentrically positioned in a direction perpendicular to the axis under a non-load input state before mounting in consideration of a static load or the like exerted under the mounting state.

  In addition, the shape and size of the inclined surface that exerts a component force action on the input load in the axial direction and the direction perpendicular to the axial direction are appropriately changed and set according to the required characteristics. Is not to be done.

  Furthermore, the shape and thickness dimension of the rubber wall portion 266 are not limited to the shape and thickness dimension of the present embodiment. For example, one of the axial directions in the first and second fluid chambers 294 and 296 may be used. Only the wall portion may have an S-shaped curved cross-sectional shape as described above.

  Further, the orifice passage is formed directly between the metal sleeve 228 and the outer cylinder fitting 214 without employing an orifice member, or is formed along the inner circumferential surface of the outer cylinder fitting 214 in the entire circumferential direction. It is also possible to form a long orifice passage in the circumferential direction by employing an annular orifice member extending over the circumference.

  Moreover, in the said embodiment, although the magnitude | size of a pair of pocket part 262a, 262b and a pair of opening window 232,232 was mutually the same, you may make them mutually differ.

  In any of the above-described embodiments, the stopper portion 224 is fixed to the inner cylinder fitting 212, but other known various stopper structures can be employed. Specifically, for example, a mass block can be accommodated in the first and second fluid chambers 294 and 296, and a pair of stopper portions can be configured by the mass block.

  Furthermore, in the present invention, the shape and structure including the length and cross-sectional area of the orifice passage are appropriately set in consideration of required characteristics and the like, and needless to say, they are not limited at all. Yes.

  That is, the structure, length, cross-sectional area, tuning, and the like of the orifice passage can be appropriately set and changed according to required design conditions and vibration isolation performance. It is also effective to tune so that a low dynamic spring effect can be exhibited against shock vibrations. In the above embodiment, the concave groove 276 of the orifice fitting 274 is opened on the outer peripheral surface side of the orifice fitting 274. However, the concave groove is formed on the inner peripheral surface side or meandering. It is also possible to form a longer orifice passage with an orifice member extending into the fluid chamber.

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

It is a longitudinal cross-sectional view of the fluid-filling type to collect bush as one embodiment of the present invention, and is a view corresponding to the II cross section in FIG. FIG. 2 is a left side view of the fluid filled to collect bush shown in FIG. 1. FIG. 2 is a right side view of the fluid filled to collect bush shown in FIG. 1. It is IV-IV sectional drawing in FIG. It is VV sectional drawing in FIG. It is a longitudinal cross-sectional view of the intermediate | middle restraint board employ | adopted as the fluid enclosure type | mold toe collect bush shown by FIG. FIG. 7 is a perspective view of an intermediate restraint plate shown in FIG. 6. It is a longitudinal cross-sectional view of the integral vulcanization molding product of the main body rubber elastic body employ | adopted as the fluid filling type | mold toe collect bush shown by FIG. It is IX-IX sectional drawing in FIG. It is XX sectional drawing in FIG. FIG. 9 is a bottom view of the integrally vulcanized molded product shown in FIG. 8. FIG. 9 is a right side view of the integrally vulcanized molded product shown in FIG. 8. FIG. 9 is a bottom view after the orifice fitting is assembled to the integrally vulcanized molded product of the main rubber elastic body shown in FIG. 8. It is the schematic which shows the mounting state to the suspension mechanism of the fluid enclosure type | mold toe collect bush shown by FIG. FIG. 15 is a graph showing the results of measuring the vibration isolation characteristics of the vibration transmission force in the vehicle longitudinal direction in the suspension mechanism shown in FIG. 14.

Explanation of symbols

210 Fluid-filled to collect bush 212 Inner cylinder fitting 214 Outer cylinder fitting 216 Body rubber elastic body 218 Fixed plate 236 Inclined plate facing portion 258 To collect rubber elastic body 266 Rubber wall portion 294 First fluid chamber 296 Second fluid chamber 298 Orifice passage

Claims (7)

The inner shaft member and the outer cylinder member spaced apart from each other are connected by a main rubber elastic body interposed between the radially opposed surfaces, and one end of the inner shaft member in the axial direction is connected. An inner inclined portion that is inclined outward in the axial direction and protrudes obliquely outward in the radial direction, and is inclined in the axial direction outwardly at one end in the axial direction of the outer cylindrical member. An outer side inclined portion that protrudes outward and is opposed to and spaced from the inner side inclined portion is provided, and a to collect rubber elasticity is provided between the opposing surfaces of the inner side inclined portion and the outer side inclined portion. In the toe collect bush with the body interposed,
The main rubber elastic body and the to-collect rubber elastic body are formed of an integral vulcanized molded product, and the inner shaft member is disposed between the radially opposed surfaces of the inner shaft member and the outer cylindrical member. A first fluid chamber and a second fluid chamber, each of which is located on both sides sandwiched in the radial direction where the side inclined portion protrudes, each of which is part of a wall portion formed of the main rubber elastic body and in which an incompressible fluid is sealed. A fluid chamber is formed, and at least one elastic wall portion in the axial direction constituted by the main rubber elastic body in the first and second fluid chambers has a diameter from the inner shaft member toward the outer cylinder member. A fluid-filled toe characterized in that it includes an inclined wall portion extending inclined with respect to the direction line, and further provided with an orifice passage for communicating the first fluid chamber and the second fluid chamber with each other. Collect bush.   A metal sleeve is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body, an opening window is provided in the metal sleeve, and a pocket portion that opens to the outer peripheral surface of the main rubber elastic body through the opening window is attached to the inner shaft member. The outer cylinder member is formed on both sides sandwiched in the radial direction, and the outer cylindrical member is fitted and fixed to the metal sleeve to cover the pocket portions in a fluid-tight manner, whereby the first fluid chamber and the second fluid chamber are covered. The fluid-filled toe collect bush according to claim 1, wherein a fluid chamber is formed.   In the metal sleeve, the two opening windows are formed to be opposed to each other in the radial direction, and a groove extending between the opening windows in the circumferential direction is formed in the outer peripheral surface so as to be formed. The fluid-filled toe collect bush according to claim 2, wherein the orifice passage is formed so as to extend in a circumferential direction along an inner peripheral surface of the outer cylindrical member in a concave groove.   The fluid-filled toe collect bush according to claim 2 or 3, wherein the outer side inclined portion is integrally formed with the metal sleeve.   The elastic wall portions on both axial sides of the first fluid chamber or the second fluid chamber gradually extend outward in the axial direction from the inner shaft member toward the outer cylindrical member. The fluid-filled toe collect bush according to any one of claims 1 to 4, wherein a substantially S-shaped curved cross-sectional shape in which the inclination angle of the intermediate portion in the radial direction is maximized.   An intermediate restraining member that is located between the opposing surfaces of the inner inclined portion and the outer inclined portion and that spreads away from the opposing surfaces of the inclined portions is disposed, and the intermediate restricting member is disposed in the to collect. 6. The fluid-filled toe collect bush according to claim 1, which is vulcanized and bonded to rubber. In the suspension mechanism in which the suspension member in which the left and right trailing arms are connected by a torsion beam is connected to the body of the automobile in a vibration-proof manner,
The fluid-filled to collect bushes according to any one of claims 1 to 6 are respectively attached to the left and right side portions of the suspension member on the front side of the vehicle, The suspension member is connected to the body in an anti-vibration manner, and the left and right fluid-filled toe collect bushes are arranged with the central axis facing the vehicle left-right direction so that the first fluid chamber and the second fluid A suspension mechanism characterized in that the chambers are opposed to each other in the vehicle longitudinal direction.

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