JP4881848B2 - Anti-vibration connecting rod - Google Patents

Description

  The present invention relates to an anti-vibration connecting rod having an anti-vibration bush, which is preferably employed as a torque rod for anti-vibration connection of a power unit to a support frame in an automobile, for example.

  Conventionally, an anti-vibration connecting rod is generally used as a kind of rod member that is interposed between two members and connects them with anti-vibration. The anti-vibration connecting rod has, for example, a structure in which both ends of the rod body having a longitudinal shape are provided with a connecting portion, and the connecting portion is attached to one of the members to be anti-vibrated and connected. . Such an anti-vibration connecting rod is employed, for example, as a torque rod for automobiles, and is also disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2007-57070).

  By the way, in the anti-vibration connecting rod, in order to suppress the transmission of the load between the members to be connected, a structure including a rubber bush on at least one of the connecting portions is suitably employed. That is, in the vibration proof connecting rod having such a structure, a rubber bush having a structure in which an inner shaft metal fitting attached to a member to be connected and an outer cylinder metal fitting fixed to the rod main body are connected by a main rubber elastic body is provided on at least one of the connecting portions. Thus, the rod main body is attached to the connection target member via the main rubber elastic body. And at the time of load input, the load transmission between connection object members is suppressed using the anti-vibration effect exhibited based on the elastic deformation of the main rubber elastic body.

  However, in the vibration-proof connecting rod having the conventional structure, the vibration-proofing effect is exerted exclusively on the basis of the elastic deformation of the main rubber elastic body constituting the rubber bush, so that the required vibration-proof characteristics are sufficiently and stable. In some cases, it was difficult to achieve. For example, when the size and shape of the rubber bush are limited by the allowable arrangement space, it may be difficult to ensure a sufficient linear region in the spring characteristics of the main rubber elastic body. In such a case, if the load input to the anti-vibration connecting rod increases, the amount of deformation of the main rubber elastic body increases and the spring constant increases non-linearly. There was a possibility that the decrease in the temperature would be a problem.

  In view of this, the present applicant has proposed a structure in which a coil spring extending in the longitudinal direction of the rod body is arranged and the input load is shared and supported by the coil spring in Patent Document 1, which is the previous application. That is, since the coil spring can obtain linear spring characteristics over a relatively large deformation stroke, by sharing the input load with the coil spring, the spring constant can be adjusted even when a large load is input. Non-linear rise can be prevented, and transmission of load between the members to be connected can be effectively suppressed.

  However, it has been clarified by experiments and examinations of the present inventors that a new problem may occur in the vibration-isolating connecting rod described in Patent Document 1. That is, when the coil spring is directly accommodated and arranged in the rod main body, which is a hard member made of metal or synthetic resin, the coil spring is accompanied by expansion and contraction in the axial direction of the coil spring due to input of a load. In some cases, a frictional sound caused by sliding of the rod body and a hitting sound caused by contact may occur, which may impair the quietness of the passenger compartment.

  Furthermore, in Patent Document 1, in the structure in which the coil spring is disposed outside the rubber bush in the longitudinal direction of the rod body, the lid fitting for closing one opening in the longitudinal direction of the accommodation hole for accommodating the coil spring is a screw. However, in such a structure, the screwing operation becomes complicated, and it is difficult to realize sufficient mass productivity, which is not practical.

  In addition, since one end of the cylindrical coil spring is configured to directly abut against the abutting rubber portion formed of a rubber elastic body, the coil spring is in the abutting rubber portion. It is difficult to ensure sufficient durability of the rubber elastic body constituting the abutting rubber part because the abutting part is easily damaged due to wear.

  The anti-vibration connecting rod disclosed in Patent Document 1 has a structure in which a coil spring is built in the rod body, and the inner shaft fitting is brought into contact with the coil spring via the contact rubber portion when a load is input. Therefore, the relative displacement amount of the inner shaft bracket relative to the outer tube bracket is not sufficiently limited, and the main rubber elastic body may be damaged by a large load input.

JP 2007-57070 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is an elastic deformation of the coil spring in the anti-vibration connecting rod that uses the excellent spring characteristics of the coil spring. A new anti-vibration connecting rod that can prevent the occurrence of abnormal noise due to contact with the coil spring and prevent damage to the rubber elastic body of the main body due to the contact of the coil spring with excellent mass productivity. There is to do.

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

  That is, according to the present invention, connecting portions are provided at both longitudinal ends of the rod main body, and at least one of the connecting portions is an elastic rubber body with an inner shaft member inserted into the outer cylinder portion. In the anti-vibration connecting rod composed of anti-vibration bushes that are elastically connected to each other, a through slit is formed in the main rubber elastic body of the anti-vibration bush in the longitudinal direction outward of the rod main body. A spring receiving hole is formed in a portion of the outer cylinder portion that is located outwardly in the longitudinal direction of the rod body with respect to the through slit, so that the spring housing hole extends in the longitudinal direction of the rod body. The inner peripheral surface of the hole is covered with a shock absorbing rubber layer integrally formed with the main rubber elastic body, and the opening on the outer cylinder portion side of the spring accommodating hole is the main rubber. Are closed by an abutting rubber part integrally formed with the sex body, and an opening on the opposite side to the outer cylinder part side is closed by a lid fitting that is caulked and fixed to the rod body. A coil spring is disposed between the abutting rubber portion and the facing surface of the lid fitting and is accommodated in the spring accommodating hole, while a first retainer member is overlaid on one axial end of the coil spring, and The second retainer member is superposed on the other axial end of the coil spring, and the first retainer member is made of resin, and the first retainer member has an outer peripheral edge portion. Is provided with a cylindrical guide portion that extends in the axial direction and covers the outer peripheral surface of the coil spring, and the inner shaft member corresponds to the input of a tensile load in the longitudinal direction of the rod body. Characterized in that said coil spring is adapted to be compressively deformed by being brought into contact with the rubber portion.

  In the anti-vibration connecting rod having the structure according to the present invention, the coil spring is disposed so as to extend in the longitudinal direction of the rod body, so that the input load is shared by the coil spring and the coil spring is prevented from being elastically deformed. A vibration effect can be obtained. In other words, by sharing the input load with a coil spring whose spring constant is linearly changed according to the amount of elastic deformation, even if the input load is large, the anti-vibration performance deteriorates due to a significant increase in the spring constant. This prevents the load from being transmitted between the members to be connected.

  Therefore, in the vibration-isolating connecting rod according to the present invention, the first retainer member and the second retainer member are attached to the axial end of the coil spring, and the cylindrical guide is attached to the first retainer member. Is provided. As a result, the coil spring can be prevented from coming into direct contact or sliding contact with the spring housing hole and the lid fitting, and noises such as striking sound due to these contact and friction sound due to sliding contact can be reduced. Or can be avoided.

  Further, a cylindrical guide portion is provided on the first retainer member made of resin, and the cylindrical guide portion covers the outer peripheral surface at the axial end portion of the coil spring. Thereby, it can prevent that the outer peripheral surface of a coil spring is directly slidably contacted with the inner peripheral surface of a spring accommodation hole, and can prevent the friction sound which arises between a coil spring and a spring accommodation hole. At the same time, the shock absorbing rubber layer covering the inner peripheral surface of the spring accommodating hole can prevent damage and wear due to contact of the coil spring.

  Furthermore, when a load is input in a direction inclined with respect to the central axis direction of the coil spring by providing the cylindrical guide portion so as to cover the outer peripheral surface of the coil spring in the first retainer member. However, when the guide action of the cylindrical guide portion is exhibited, the coil spring is compressed and deformed into a predetermined shape in the axial direction without causing bending or the like, and the intended vibration isolation effect is effectively exhibited. .

  Further, by interposing one of the first retainer member and the second retainer member between the end surface of the coil spring and the facing surface of the contact rubber portion, an external force due to contact with the coil spring in the contact rubber portion. Can be increased, and the acting force (pressure) per unit area can be reduced. Therefore, it is possible to prevent the contact rubber part from being partially damaged due to wear or the like and to improve the durability.

  Further, since the lid fitting is caulked and fixed to the rod body, the lid fitting can be easily attached to the rod body and the coil spring can be accommodated in the spring accommodation hole. This makes it possible to manufacture the torque rod according to the present invention, which has excellent effects, with excellent mass productivity.

  Further, in the vibration-isolating connecting rod according to the present invention, a central recess is formed in the central portion of the lid fitting that opens toward the inside in the longitudinal direction of the rod main body, and the center recess is It is desirable that any one of the first retainer member and the second retainer member is fitted.

  By providing such a central recess in the lid fitting, either the first retainer member or the second retainer member is positioned and fitted in the radial direction with respect to the lid fitting. Thereby, it is possible to effectively prevent the generation of noise due to striking or friction between the first retainer member or the second retainer member and the lid fitting.

  In the vibration-isolating connecting rod according to the present invention, preferably, a central convex portion is formed at a central portion of at least one of the first retainer member and the second retainer member, and the central convex portion is The coil spring is fitted into the end of the central hole.

  In this way, by inserting the central convex portion provided on at least one of the first and second retainer members into the central hole of the coil spring, the resin retainer member including the coil spring and the central convex portion can be formed in the radial direction. Easy positioning. Further, the resin retainer member is fixedly assembled to the coil spring by the insertion of the central convex portion, thereby effectively preventing the contact hitting sound and the friction sound between the coil spring and the resin retainer member. I can do it.

  In the vibration-isolating connecting rod according to the present invention, the second retainer member may be made of resin.

  Thus, by making the second retainer member, which is superimposed on the end of the coil spring opposite to the outer cylindrical portion, made of resin, friction and contact between the coil spring and the spring accommodating hole and the second retainer member are achieved. It is possible to reduce or avoid the generation of abnormal noise. In addition, a cylindrical guide portion that covers the outer peripheral surface of the coil spring may be provided on the second retainer member in the same manner as the first retainer member, and noise due to friction between the coil spring and the spring accommodation hole is more effective. Can be prevented.

  In the vibration-isolating connecting rod according to the present invention, the first retainer member is overlapped with an end portion of the coil spring on the outer tube portion side, and the second retainer member is attached to the coil spring. It is desirable to overlap the end portion on the opposite side to the outer cylinder portion.

  In this way, the retainer member that is overlapped with the end portion on the outer tube portion side of the coil spring that is reciprocated in accordance with the displacement of the inner shaft member is a first retainer member that is made of resin and has a cylindrical guide portion. Thus, the sliding friction with respect to the spring accommodating hole is reduced when the coil spring is deformed. Therefore, generation of frictional noise due to sliding contact between the first retainer member and the spring accommodation hole and wear of the buffer rubber layer covering the inner peripheral surface of the spring accommodation hole are reduced.

  In addition, since the cylindrical guide portion is provided so as to cover the outer peripheral surface of the outer cylindrical portion side end portion of the coil spring that is easily deformed by the input of a load, the coil spring can be inclined or bent by the action of an external force. It can be prevented more effectively.

  In the vibration-isolating connecting rod according to the present invention, the inner-side contact portion of the inner shaft member that is positioned opposite to the outer cylinder portion in the longitudinal direction of the rod body at a portion off the contact rubber portion. May be provided.

  According to this, when the inner shaft member is relatively displaced in the longitudinal direction of the rod main body with respect to the outer cylinder portion by the input of a large load, the inner side contact portion is brought into contact with the outer cylinder portion. Thus, the relative displacement between the inner shaft member and the outer cylinder portion is limited. Thereby, it can prevent that a big stress acts with respect to a main body rubber elastic body by the excessive relative displacement of an inner shaft member and an outer cylinder part, and can improve durability of a main body rubber elastic body.

  Furthermore, in the vibration-isolating connecting rod according to the present invention, when adopting a structure in which the inner side contact portion is provided with respect to the inner shaft member, a pair of the inner side contact portions is provided, A pair of inner side abutting portions may be positioned opposite to each other in the longitudinal direction of the rod body with respect to the portion of the outer cylinder portion where the abutting rubber portion is deviated on both sides in the circumferential direction.

  If such a structure is adopted, the inner side abutting portion and the outer cylinder portion are brought into contact with each other on both sides of the abutting rubber portion, so that the inner side abutting portion and the outer cylinder portion are in contact with each other. It is possible to prevent the rotational moment due to contact with the shaft member from acting, and to reduce or avoid stress in the twisting direction or twisting direction acting on the main rubber elastic body. Thereby, the durability of the main rubber elastic body can be improved.

  In the vibration-isolating connecting rod according to the present invention, any one of the connecting portions is a first rubber in which the first inner shaft member and the first outer cylinder portion are elastically connected by the first main rubber elastic body. A second bushing is formed by elastically connecting the second inner shaft member and the second outer cylinder portion with a second main rubber elastic body. In addition, at least one of the first rubber bush and the second rubber bush may be the anti-vibration bush.

  According to this, since both ends of the rod body are elastically attached to the connection target member via the rubber bush, the transmission of the load between the connection target members can be more effectively suppressed.

  In addition, in the vibration-proof connecting rod according to the present invention, when the structure in which the first and second rubber bushes are disposed with respect to the connecting portion is adopted, the rod body is formed of the first plate-like metal fitting. The second plate-shaped metal fitting is configured by overlapping and fixing, and the first outer cylindrical portion and the first plate-shaped metal fitting are disposed between the overlapping surfaces of the first plate-shaped metal fitting and the second plate-like metal fitting. A connecting space extending in the longitudinal direction of the rod body is formed between the two outer cylinder portions, and the first main rubber elastic body and the second body are formed by a rubber elastic body filled in the connecting space. The main rubber elastic body is formed as an integral molded structure, and the spring accommodating hole is formed so as to extend between the overlapping surfaces of the first plate-like metal fitting and the second plate-like metal fitting. Also good.

  Thus, the rod body can be easily formed by press working or the like by making the rod body a divided structure composed of the first and second plate-shaped metal fittings. Further, a connecting space is provided between the first and second plate-shaped metal fittings, the connecting space is filled with a rubber elastic body, and the first main rubber elastic body and the second body are filled with the rubber elastic body. By forming the main rubber elastic body as an integral molding structure, the first and second main rubber elastic bodies can be vulcanized and molded at the same time, and productivity can be improved.

  Furthermore, by forming the spring accommodating hole between the overlapping surfaces of the first plate-shaped metal fitting and the second plate-shaped metal fitting, the spring accommodating hole having a predetermined shape can be easily formed at the target position.

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

  First, FIGS. 1 to 3 show a torque rod 10 for an automobile as an embodiment of an anti-vibration connecting rod having a structure according to the present invention. The torque rod 10 has a structure provided with a first rubber bush 14 and a second rubber bush 16 as connecting portions at both end portions of the rod body 12. The first rubber bushing 14 is attached to a power unit of an automobile (not shown), and the second rubber bush 16 is attached to the body of an automobile (not shown), so that the power unit is mounted between the power unit and the vehicle body. The torque reaction force of the power unit is bufferedly transmitted to the vehicle body while suppressing vibration transmission from the vehicle body to the vehicle body. The longitudinal direction of the rod body 12 is a linear direction connecting the first rubber bush 14 and the second rubber bush 16, and in the following description, it refers to the left-right direction in FIG. 1.

  More specifically, as shown in FIG. 3, the rod main body 12 is fixed by superposing the upper divided plate fitting 18 and the lower divided plate fitting 20 having substantially the same structure on each other in the thickness direction. It is a divided structure. The upper divided plate metal fitting 18 and the lower divided plate metal fitting 20 are assembled as shown in FIG. 1 in a plan view in the assembled state and in FIG. 3 in a longitudinal sectional view in the assembled state. In the present embodiment, all of them are high-rigidity members formed of a metal material such as iron or aluminum alloy.

  The upper and lower divided metal plates 18 and 20 are formed with circular small-diameter openings 22 and 24 at corresponding positions near one end in the longitudinal direction, while near the other end in the longitudinal direction. At the corresponding positions, large-diameter openings 26 and 28 that are substantially oval are formed.

  Further, as shown in FIG. 3, the upper divided plate metal member 18 has a first upper divided cylindrical portion 30 that protrudes at a predetermined height upward from the opening peripheral edge of the small-diameter opening 22. A second upper divided cylindrical portion 32 that is integrally formed and projects upward at a predetermined height from the opening peripheral edge of the large-diameter opening 26 is integrally formed. Further, an upper divided connecting portion 34 extending between the first upper divided cylindrical portion 30 and the second upper divided cylindrical portion 32 is integrally formed at the center in the width direction of the upper divided metal plate 18. Yes. The upper divided connecting portion 34 has a concave groove shape that opens downward. In the present embodiment, the upper divided connecting portion 34 gradually becomes wider toward the opening side (downward in FIG. 3).

  Further, as shown in FIG. 3, the lower divided plate member 20 has a first lower divided cylindrical portion that protrudes downward at a predetermined height from the opening peripheral edge of the small-diameter opening 24. 36 is integrally formed, and a second lower divided cylindrical portion 38 that protrudes downward from the peripheral edge of the large-diameter opening 28 at a predetermined height is integrally formed. Furthermore, a lower divided connecting portion 40 extending between the first lower divided cylindrical portion 36 and the second lower divided cylindrical portion 38 is provided at the center in the width direction of the lower divided metal plate 20. It is integrally formed. The lower divided connecting portion 40 has a concave groove shape that opens downward. In the present embodiment, the lower divided connecting portion 40 gradually becomes wider toward the opening side (upward in FIG. 3).

  The upper and lower divided metal parts 18 and 20 having such a structure are formed by punching a flat metal plate such as stainless steel into an appropriate shape and pressing the upper and lower first and second divided cylinders. The shape portions 30, 32, 36, 38, the upper and lower divided connecting portions 34, 40, and the upper and lower divided accommodating portions 74, 76 described later can be formed advantageously by press molding. In particular, by forming the upper and lower divided metal brackets 18 and 20 with such press fittings, the rod body 12 can be formed thin and compact while ensuring sufficient strength and dimensional accuracy. Moreover, excellent mass productivity can be realized. Moreover, in addition to being able to arbitrarily set the size of the upper and lower first and second divided cylindrical portions 30, 32, 36, and 38 in the radial direction and the axial direction, the upper and lower divided connections The shapes and forming positions of the portions 34 and 40 and the upper and lower divided housing portions 74 and 76 are set with a large degree of freedom, and they can be easily formed.

  As shown in FIG. 3, the upper and lower divided metal parts 18 and 20 are stacked one above the other in the thickness direction, and the upper and lower divided metal parts 18 and 20 constitute the rod body 12. Yes. In the rod body 12 formed in this way, the opening edge portions of the upper and lower divided connection portions 34 and 40 are overlapped with each other, and a tunnel-like connection space 42 extending in the longitudinal direction of the rod body 12 is formed. Has been.

  Further, in the rod main body 12, the first outer part extending on one axis orthogonal to the overlapping surface of the upper and lower divided plate fittings 18 and 20 by the cooperation of the first upper and lower divided cylindrical portions 30 and 36. An outer cylinder formed with a cylindrical portion 44 and extending on a single axis perpendicular to the overlapping surfaces of the upper and lower divided plate metal members 18 and 20 by the cooperation of the second upper and lower divided cylindrical portions 32 and 38. A second outer cylinder portion 46 is formed as a portion. In the present embodiment, the bush assembly hole is configured by the large-diameter openings 26 and 28 aligned with each other under the assembly of the upper and lower divided plate members 18 and 20.

  Further, an inner cylinder fitting 48 is inserted through the first outer cylinder portion 44. The inner cylinder fitting 48 is a highly rigid member formed of a metal such as iron or aluminum alloy, and has a substantially cylindrical shape with a thick and small diameter as compared to the first outer cylinder portion 44. In the present embodiment, the axial dimension is made larger than that of the first outer cylinder part 44, and the inner cylinder fitting 48 is protruded from both axial sides of the first outer cylinder part 44.

  A first main rubber elastic body 50 is interposed between the first outer cylinder portion 44 and the inner cylinder fitting 48. The first main rubber elastic body 50 is formed of a thick rubber elastic body having a substantially cylindrical shape, and its outer peripheral surface is vulcanized and bonded to the inner peripheral surface of the first outer cylinder portion 44. The inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner cylinder fitting 48, so that the first outer cylinder portion 44 and the inner cylinder fitting 48 are elastically connected.

  As described above, the first rubber bush 14 having a structure in which the first outer cylinder portion 44 and the inner cylinder fitting 48 are elastically connected to the one end portion in the longitudinal direction of the rod main body 12 by the first main rubber elastic body 50. Is formed. The inner cylinder 48 is attached to the power unit of the automobile, so that one end of the rod body 12 is attached to the power unit via the first rubber bush 14.

  On the other hand, the inner shaft fitting 52 is inserted through the second outer cylinder portion 46. The inner shaft fitting 52 is a highly rigid member made of the same material as that of the inner cylinder fitting 48 and has a columnar shape having a substantially oval cross section with a smaller diameter than the second outer cylinder portion 46. ing. In the present embodiment, the inner shaft fitting 52 is slightly larger in the axial dimension than the second outer cylinder portion 46, and the inner shaft fitting 52 extends from both axial sides of the second outer cylinder portion 46. It is protruding.

  Further, the inner shaft fitting 52 is formed with an attachment hole 54 and a lightening hole 56. The mounting hole 54 has a substantially constant circular cross section and is formed through the inner shaft fitting 52 in the axial direction. As shown in FIGS. 1 and 2, the lightening hole 56 has a rectangular cross section with rounded corners, and is inward in the longitudinal direction of the rod body 12 with respect to the mounting hole 54. Are formed so as to penetrate the inner shaft fitting 52 in the axial direction.

  Furthermore, the inner shaft fitting 52 is formed with a pair of stopper protrusions 58, 58 as inner side contact portions. The stopper protrusion 58 is integrally formed at the outer end in the longitudinal direction of the rod body 12 in the inner shaft fitting 52, and protrudes on both sides in the width direction of the rod body 12. Further, as shown in FIG. 1, the side surface of the stopper protrusion 58 is smoothly connected to the outer peripheral surface of the inner shaft fitting 52, and the protruding tip portion is substantially arc-shaped in plan view. The whole is composed of a smooth curved surface having no corners. As a result, when the stopper protrusion 58, which will be described later, is brought into contact with the second outer cylinder portion 46, the contact area can be gradually increased to exert a buffering stopper effect, and local stress concentration can be achieved. Damage due to can be avoided.

  A second main rubber elastic body 60 is interposed between the second outer cylinder portion 46 and the inner shaft fitting 52. It has a thick cylindrical shape having a substantially oval cross section, and its outer peripheral surface is vulcanized and bonded to the inner peripheral surface of the second outer cylindrical portion 46, and its inner peripheral surface is the inner shaft fitting 52. By vulcanizing and adhering to the outer peripheral surface, the second outer cylinder portion 46 and the inner shaft fitting 52 are elastically connected.

  As described above, the second outer cylinder portion 46 and the inner shaft fitting 52 are elastically connected by the second main rubber elastic body 60 to one end portion in the longitudinal direction of the rod main body 12. Two rubber bushings 16 are formed. The inner shaft member 52 is attached to the body of the automobile, so that the other end of the rod body 12 is attached to the vehicle body via the second rubber bush 16.

  Further, a first slit 62 is formed in the second main rubber elastic body 60. The first slit 62 is formed inward in the longitudinal direction of the rod main body 12 with respect to the inner shaft fitting 52, and the dimension in the width direction (vertical direction in FIG. 1) of the rod main body 12 is the second outer. The size reaches a later-described covering rubber layer 70 fixed to the cylindrical portion 46.

  Further, a stopper rubber 64 is projected from the second outer cylinder portion 46 toward the first slit 62. The stopper rubber 64 is formed integrally with the second main rubber elastic body 60 and protrudes toward the outer side in the longitudinal direction of the rod main body 12 at the central portion in the axial direction. It is located opposite to each other with a predetermined distance.

  The second main rubber elastic body 60 has a second slit 66 as a through slit. The second slit 66 is formed outside in the longitudinal direction of the rod body 12 with respect to the inner shaft fitting 52, and the dimension in the width direction of the rod body 12 is fixed to the second outer cylinder portion 46. The size reaches a covering rubber layer 70 described later. In this embodiment, as shown in FIGS. 1 and 2, the second slit 66 extends to both sides of the inner shaft member 52 in the width direction.

  Further, in the present embodiment, the connecting rubber 68 is filled in the connecting space 42 formed between the overlapping surfaces of the upper divided plate member 18 and the lower divided plate member 20 in the rod body 12, and the first rubber is formed. The first main rubber elastic body 50 constituting the bush 14 and the second main rubber elastic body 60 constituting the second rubber bush 16 are formed as an integral molded structure connected by a connecting rubber 68. Yes. In other words, in this embodiment, the first main rubber elastic body 50, the second main rubber elastic body 60, and the connecting rubber 68 are integrally formed.

  Further, in the present embodiment, a covering rubber layer 70 is formed on the rod body 12 by adhesion. The covering rubber layer 70 is a thin rubber elastic body and is formed so as to cover the outer surface of the rod body 12. As shown in FIG. 3, the covering rubber layer 70 of this embodiment is integrally formed with the first and second main rubber elastic bodies 50 and 60 and the connecting rubber 68. In the present embodiment, the first and second main rubber elastic bodies 50 and 60, the connecting rubber 68, the covering rubber layer 70, and the buffer rubber layer 78 described later are provided on the upper and lower divided plate fittings 18 and 20, respectively. It is formed as an integrally vulcanized molded product provided with an inner cylinder fitting 48 and an inner shaft fitting 52.

  On the other hand, in the rod main body 12, an accommodation cylinder portion 72 is formed on the outer side in the longitudinal direction of the rod main body 12 with respect to the second rubber bush 16. The housing cylinder portion 72 has a substantially cylindrical shape extending in the longitudinal direction of the rod body 12, and has an integrated structure with the second outer cylinder portion 46. In the second outer cylinder portion 46, a circular through hole is formed in a portion located on the outer side in the longitudinal direction of the rod body 12 with respect to the second slit 66, and the central hole of the accommodation cylinder portion 72 is formed. It is connected.

  Further, in the present embodiment, the accommodating cylinder portion 72 includes a substantially semicircular upper divided accommodating portion 74 formed in the central portion in the width direction of the upper divided plate metal member 18 and a central portion in the width direction of the lower divided plate metal member 20. The lower divided housing portion 76 having a substantially semicircular shape formed in the above is combined. As can be understood from FIGS. 1 and 6, in the upper and lower divided housing portions 74 and 76 constituting the housing cylinder portion 72, the portions outside the intermediate portion in the longitudinal direction of the rod body 12 are semicircular cross sections. And a flange-like portion extending outward in the width direction from the opening edge of the upper and lower divided housing portions 74 and 76 is provided on the inner side of the intermediate portion in the longitudinal direction. Yes.

  In addition, a buffer rubber layer 78 formed of a thin rubber elastic body is attached and formed on the inner peripheral surface of the housing cylinder portion 72 so as to cover substantially the entire surface. In the present embodiment, the buffer rubber layer 78 is integrally formed with a covering rubber layer 70 that covers the outer surface of the rod body 12 as shown in FIG.

  Further, one opening (left end in FIG. 1) in the axial direction of the housing cylinder 72 is provided in the second slit 66 through a circular through hole formed in a part of the circumference of the second outer cylinder 46. It is opened toward. Thereby, the spring accommodation hole in this embodiment is formed by cooperation of the center hole of the accommodation cylinder part 72, and this through-hole formed in the 2nd outer cylinder part 46. FIG. The through hole formed in the second outer cylinder portion 46 has substantially the same diameter as the central hole of the accommodation cylinder portion 72, and one end portion in the axial direction of the accommodation cylinder portion 72 is the second outer cylinder. The unit 46 is integrally connected.

  Further, the opening on the second outer cylinder part 46 side of the accommodation cylinder part 72 is covered with a contact rubber film 80 as a contact rubber part integrally formed with the second main rubber elastic body 60. The abutting rubber film 80 has a thin, substantially bottomed cylindrical shape, and its opening peripheral edge extends over the entire periphery with respect to the opening peripheral edge on the second outer cylinder part 46 side of the accommodation cylinder part 72. As a result, the one opening of the accommodating cylinder 72 is closed by the contact rubber film 80.

  The inner shaft fitting 52 is opposed to the contact rubber film 80 at a predetermined distance in the longitudinal direction of the rod body 12. Further, the rod body with respect to the second outer cylinder portion 46 at a position where the tip portions of the stopper projections 58, 58 formed integrally with the inner shaft metal fitting 52 are disengaged from both sides of the contact rubber film 80 in the circumferential direction. 12 are opposed to each other at a predetermined distance in the longitudinal direction.

  Further, a caulking portion 82 is integrally formed on the opening peripheral edge portion of the housing cylinder portion 72 opposite to the second outer cylinder portion 46. The caulking portion 82 has a flange shape that expands toward the outer peripheral side at the other end in the axial direction of the housing cylinder portion 72 and is continuously formed over the entire circumference.

  Further, the opening on the side where the caulking portion 82 is provided in the accommodating cylinder portion 72 is closed by a lid fitting 84. The lid fitting 84 has a generally shallow dish shape as a whole, and a caulking piece 86 is integrally formed at the periphery of the opening. Further, in the present embodiment, a central recess 88 is formed in the central portion in the radial direction of the lid fitting 84 and is opened toward the inner side in the longitudinal direction of the rod body 12, and the radial direction of the central recess 88 is provided. A through hole 90 is formed through the central portion.

  The lid fitting 84 having such a structure is overlapped with the housing cylinder 72 in the longitudinal direction of the rod main body 12, in other words, in the central axis direction of the housing cylinder 72, and the end of the housing cylinder 72 is The caulking piece 86 provided on the lid metal fitting 84 is inserted into the lid metal fitting 84 and fixed to the caulking part 82 provided on the accommodation cylinder portion 72, thereby being attached to the accommodation cylinder portion 72. Yes.

  In this way, one opening of the housing cylinder 72 is closed with the contact rubber film 80 and the other opening is closed with the lid fitting 84, thereby On the side, an accommodation space 91 separated from the external space is formed between the facing surfaces of the contact rubber film 80 and the lid fitting 84. As is clear from the above contents, the accommodation space 91 is formed between the overlapping surfaces of the upper and lower divided metal plates 18 and 20.

  A coil spring 92 is housed in the housing space 91 formed on the inner peripheral side of the housing cylinder portion 72. The coil spring 92 in the present embodiment is a general spiral metal spring, and extends in a spiral shape with a substantially constant cross-sectional shape having a square shape with rounded corners as shown in FIG. ing. The coil spring 92 is formed with an outer diameter that is slightly smaller than the inner dimension in the radial direction of the accommodation space 91.

  Here, a first resin retainer member 94 as a first retainer member is attached to one end of the coil spring 92 in the axial direction. The first resin retainer member 94 has a plate-like portion 95 having a substantially disk shape, and the plate-like portion 95 is overlapped with the end surface of the coil spring 92 on the contact rubber film 80 side.

  Further, in the first resin retainer member 94, a central convex portion 96 is formed so as to protrude from the central portion in the radial direction of the plate-like portion 95. The central convex portion 96 has a circular cross section having a diameter corresponding to the central hole of the coil spring 92, and is protruded in the longitudinal direction of the rod main body 12 from the surface on the side overlapped with the coil spring 92. Yes. In the present embodiment, the first convex retainer member 94 is attached to the coil spring 92 by fitting the central convex portion 96 into the central hole of the coil spring 92 from the abutting rubber film 80 side. And is fixedly fitted to one end of the coil spring 92.

  Further, a guide tube portion 98 as a tubular guide portion is integrally formed on the outer peripheral edge portion of the first resin retainer member 94. The guide tube portion 98 has a substantially cylindrical shape having an inner diameter that is slightly larger than the outer diameter of the coil spring 92 and an outer diameter that is slightly smaller than the inner peripheral surface of the buffer rubber layer 78. The spring 92 extends about half as long. Further, the protruding tip portion of the guide tube portion 98 has a tapered shape that gradually becomes smaller in diameter toward the protruding tip side. The first resin retainer member 94 is attached to one end of the coil spring 92 in the axial direction, so that the guide tube portion 98 surrounds the outer peripheral side of the end of the coil spring 92 on the contact rubber film 80 side. Yes. Thus, one end of the coil spring 92 is positioned between the central convex portion 96 and the guide tube portion 98 in the radial direction and is positioned in the radial direction.

  The material of the first resin retainer member 94 is desirably a synthetic resin having a sufficiently large rigidity and a self-lubricating property with a small friction coefficient on the surface. Specifically, for example, polyoxymethylene (POM), polyamide (PA), fluororesin-based polytetrafluoroethylene (PTFE), polyimide resin, and the like can be suitably employed. By employing such a low-friction synthetic resin, it is possible to reduce or avoid frictional noise generated between the first resin-made retainer member 94 and the accommodating cylinder portion 72 or the coil spring 92.

  On the other hand, a second resin retainer member 100 as a second retainer member is attached to the other axial end of the coil spring 92. The second resin retainer member 100 has a plate-like portion 101 having a substantially disc shape, and the plate-like portion 101 is overlapped with the end surface of the coil spring 92 on the lid fitting 84 side. In the present embodiment, the second resin-made retainer member 100 is formed from a low friction synthetic resin that is substantially the same as the first resin-made retainer member 94.

  Further, in the second resin retainer member 100, a central convex portion 102 is formed so as to protrude from the central portion in the radial direction of the plate-like portion 101. The central convex portion 102 has a circular cross section having a diameter corresponding to the central hole of the coil spring 92, and is protruded in the longitudinal direction of the rod main body 12 from the surface on the side overlapped with the coil spring 92. Yes. In the present embodiment, the center convex portion 102 is fitted into the center hole of the coil spring 92 from the lid fitting 84 side, so that the second resin retainer member 100 has a diameter relative to the coil spring 92. It is positioned in the direction and is fixedly fitted to the other end of the coil spring 92.

  In the second resin retainer member 100, a vent hole 104 is formed at the radial center of the central protrusion 102. The vent hole 104 is a circular hole having a shape corresponding to the through hole 90 formed in the lid fitting 84, and penetrates the second resin retainer member 100 in the axial direction. And in the attachment state of the 2nd resin retainer member 100 with respect to the cover metal fitting 84 mentioned later, the through-hole 90 and the vent hole 104 are aligned, and the accommodation space 91 is made into external space through the through-hole 90 and the vent hole 104. It is communicated. Thereby, the spring by the air in the accommodation space 91 acts on the basis of the elastic deformation of the contact rubber film 80 which constitutes a part of the wall portion of the accommodation space 91, in other words, the expansion and contraction deformation of the coil spring 92. Can be prevented.

  The coil spring 92 to which the first and second resin retainer members 94 and 100 having such a structure are attached is disposed between the facing surfaces of the abutting rubber film 80 and the lid fitting 84, and accommodates a space. 91. Further, under the state in which the coil spring 92 is disposed in the accommodation space 91, the first resin retainer member 94 is fitted into the contact rubber film 80 having a substantially bottomed cylindrical shape and overlapped. At the same time, the second resin retainer member 100 is fitted into and fixed to the central recess 88 of the lid fitting 84. As a result, the first resin retainer member 94 is allowed to be displaced relative to the rod body 12 in the longitudinal direction by the elastic deformation of the contact rubber film 80 and the coil spring 92, and the second resin retainer 94 The member 100 is fixed to and supported by the rod body 12.

  Further, the tip end portion of the guide cylinder portion 98 integrally formed on the outer peripheral edge portion of the first resin retainer member 94 is positioned between the radially opposing surfaces of the accommodating cylinder portion 72 and the coil spring 92, and the buffer The housing cylinder 72 to which the rubber layer 78 is fixed and the coil spring 92 are prevented from being brought into direct contact with each other.

  The longitudinal direction of the rod body 12 with respect to the inner cylinder fitting 48 and the inner shaft fitting 52 of the first and second rubber bushes 14 and 16 under the mounting state of the torque rod 10 having the above-described structure in the automobile. When the vibration load is input, the vibration isolation effect is exhibited based on the elastic deformation of the first and second main rubber elastic bodies 50 and 60 in the first and second rubber bushes 14 and 16. ing.

  Further, when the inner shaft fitting 52 is displaced in a direction away from the inner tube fitting 48 by the input of a large load, the inner shaft fitting 52 is brought into contact with the coil spring 92 via the contact rubber film 80. The coil spring 92 can be compressed and deformed. As described above, the input load is shared by the coil spring 92 in which the change in the spring characteristic with respect to the deformation amount is shared, so that a significant increase in the spring constant can be avoided even when a large load is input, It is possible to effectively prevent transmission of vibration between the power unit and the vehicle body.

  Further, when the inner shaft fitting 52 is displaced larger toward the outside in the longitudinal direction of the rod body 12 by the input of a larger load, the stopper protrusion 58 provided on the inner shaft fitting 52 becomes the second outer cylinder portion 46. Against each other. Thereby, the relative displacement with respect to the 2nd outer cylinder part 46 of the inner shaft metal fitting 52 is restrict | limited. In particular, in this embodiment, the outer peripheral surface of the stopper protrusion 58 and the inner peripheral surface of the second outer cylinder portion 46 are respectively covered with a part of the second main rubber elastic body 60. Therefore, the stopper effect due to the contact between the stopper projection 58 and the second outer cylinder portion 46 is expressed in a buffer manner.

  Here, in the torque rod 10 having the structure according to the present embodiment, first and second resin retainer members 94 and 100 made of synthetic resin are attached to both ends of the coil spring 92. Direct contact between the rod body 12 and the lid fitting 84 is prevented. Further, the inner peripheral surface of the accommodating cylinder portion 72 in which the coil spring 92 is accommodated is covered with the cushioning rubber layer 78 over the entire surface, and the first resin retainer member 94 and the accommodating cylinder portion 72 are composed of the cushioning rubber layer. It is made to contact | abut via 78. FIG.

  Thereby, when the coil spring 92 is elastically deformed by the contact of the inner shaft fitting 52, it is possible to effectively generate abnormal noise due to contact or sliding contact between the coil spring 92 and the inner wall surface of the housing space 91. Can be prevented. In addition, since the inner peripheral surface of the housing cylinder portion 72 is covered with the buffer rubber layer 78, the generation of noise due to the contact between the first resin retainer member 94 and the housing cylinder portion 72 is prevented.

  Furthermore, since the first and second resin retainer members 94 and 100 are formed of a synthetic resin having excellent slidability, in other words, having a small friction coefficient, Generation of abnormal noise due to friction of the coil spring 92 can be prevented. Moreover, the guide tube portion 98 inserted between the housing tube portion 72 on which the buffer rubber layer 78 is attached and the coil spring 92 is brought into sliding contact with the buffer rubber layer 78 and the coil spring 92. It is possible to effectively prevent the generation of abnormal noise.

  Further, by providing a guide cylinder portion 98 at the outer peripheral edge portion of the first resin retainer member 94 so as to surround the outer peripheral side of the coil spring 92 with the guide cylinder portion 98, the axial direction of the coil spring 92 can be reduced. Even when a load in the inclined direction is input, it is possible to prevent the coil spring 92 from inclining and coming into contact with the housing cylinder portion 72, and to more effectively prevent the generation of abnormal noise.

  Further, in the torque rod 10 according to the present embodiment, the rod body 12 has a divided structure in which the upper and lower divided plate members 18 and 20 are overlapped, and the first rubber bush 14 and the second rubber bush 16. The connecting rubber 68 is filled in the middle portion in the width direction. Thereby, the damping force by the connecting rubber 68 can be applied to the metal rod main body 12, and more excellent vibration isolation performance can be realized. Furthermore, since the rod body 12 has a divided structure, the coil spring 92 can be easily disposed in the accommodation space 91.

  In addition, since the lid fitting 84 is caulked and fixed to the rod main body 12, the assembling work of the lid fitting 84 to the rod main body 12 can be made extremely simple and high mass productivity can be realized. I can do it.

  As mentioned above, although one Embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, in the above-described embodiment, a structure in which the rubber bushes 14 and 16 are provided at both ends of the rod body 12 is shown. However, the rubber bush may be provided at at least one end of the rod body 12. . Specifically, for example, the first outer cylinder portion 44 and the inner cylinder fitting 48 are connected to each other by a hard member, and the inner cylinder fitting 48 is subjected to a twist displacement or a central axis with respect to the first outer cylinder portion 44. A ball joint structure that is allowed to rotate around can also be used as the connecting portion. Further, for example, one end of the rod body 12 is elastically attached to the connection target member via a rubber bush, and the other end is fixed to the connection target member by bolt fixing, welding, engagement. It may be rigidly joined by means such as a stop.

  Furthermore, the second rubber bush 16 shown in the embodiment is an example of the vibration isolating bush according to the present invention, and the structure of the anti-vibration bush is the second rubber bush 16 shown in the embodiment. Is not to be construed as limiting. That is, a rubber bush having various known structures can be employed as the anti-vibration bush. For example, a ball bush having a structure as shown in FIG. 6 of Japanese Patent Laid-Open No. 2001-41234 is employed. It is also possible.

  Moreover, in the said embodiment, although the rubber bushes 14 and 16 are formed using the rod main body 12, the rubber bush which has a structure which connected the inner shaft member and the outer cylinder member with the main body rubber elastic body, for example, The rubber bushing is formed separately from the rod body, and the rubber bushing is fixed to the rod by pressing the outer cylinder member of the rubber bushing into the bushing assembly hole formed at the longitudinal end of the rod body. It can also be provided at the end of the body.

  Moreover, in the said embodiment, although the structure which provided the anti-vibration bush (2nd rubber bush 16) provided with the coil spring 92 in the one end of the longitudinal direction of the rod main body 12 is shown, You may provide the anti-vibration bush provided with the coil spring 92 in both ends. Specifically, for example, anti-vibration bushes having a structure according to the second rubber bush 16 in the above embodiment may be provided at both ends of the rod body 12.

  Moreover, in the said embodiment, although the rod main body 12 extended linearly is illustrated, the rod main body may be curved thru | or bent in the intermediate part. Furthermore, in the above-described embodiment, one linearly extending rod body 12 is shown. For example, as shown in each figure of JP-A-8-332858, the longitudinal direction of the rod body is shown. The present invention can be similarly applied to a longitudinal connecting rod in which one end or both ends are branched to form a T shape or an H shape as a whole. Are also included in the technical scope of the present invention.

  Further, the rod body does not necessarily have to be a divided structure as shown in the above embodiment, for example, like the rod body shown in FIG. 12 of Japanese Patent Application Laid-Open No. 2007-57070. A structure in which a caulking portion is provided on a rod body formed by means such as die casting and a lid fitting is caulked and fixed can also be employed. Further, at least a part of the rod body has a divided structure in which the first divided metal fitting and the second divided metal fitting are overlapped, and the first divided metal fitting and the second divided metal fitting are overlapped in the divided structure portion. You may employ | adopt the structure in which the spring accommodation hole was formed between the mating surfaces.

  Further, the inner shaft fitting 52 shown in the embodiment has a structure that can effectively exert a stopper effect at the time of inputting a tensile load, but the specific structure of the second inner shaft fitting is described above. It is not limited to what was shown in the embodiment. For example, it may have a substantially cylindrical shape similar to the inner cylinder fitting 48.

  Further, the inner shaft fitting 52 is formed with stopper protrusions 58 on both sides of the contact rubber film 80 in the circumferential direction, and the inner shaft is supported by the contact between the stopper protrusion 58 and the second outer cylinder portion 46. A stopper mechanism for limiting relative displacement of the metal fitting 52 to the second outer cylinder portion 46 is realized, but the stopper mechanism is not necessarily realized only by the stopper protrusion 58 having the structure shown in the above embodiment. Is not to be done. Specifically, for example, the stopper mechanism can be configured by providing a stopper protrusion at a portion of the inner shaft member where the abutting rubber film 80 deviates outward in the axial direction. Further, for example, the stopper protrusion may be formed so as to protrude from the outer tube portion side toward the inner shaft member side.

  Moreover, in the said embodiment, although the structure which provided the guide cylinder part 98 in the 1st resin-made retainer member 94 attached to the contact rubber film 80 side edge part of the coil spring 92 is shown, for example, FIG. 1, the first resin retainer member 94 may include a guide tube portion 98, and the second resin retainer member 106 may include a guide tube portion 108. . In short, the cylindrical guide portion may be provided on both the first retainer member and the second retainer member so that the axial end portions of the coil springs are respectively surrounded by the cylindrical guide portion. Note that the protruding heights of the guide tube portion 98 and the guide tube portion 108 are not necessarily the same. Moreover, the cylindrical guide part may be provided only in the retainer member overlapped with the axial direction end surface of the coil spring on the lid fitting side.

  Further, the second retainer member that is superimposed on the end of the coil spring opposite to the outer cylinder portion does not necessarily have to be made of resin. For example, as shown in FIG. The formed second retainer member 110 can also be employed. Even when the second retainer member 110 formed of such a rubber elastic body is employed, it is possible to effectively reduce the hitting sound caused by the contact between the coil spring and the lid fitting. In the case where the second retainer member is formed of a rubber elastic body, the spring constant is relatively large in order to advantageously realize the durability of the second retainer member and the prevention of the inclination of the coil spring. It is desirable to form a hard rubber elastic body. Further, by forming the second retainer member with a rubber elastic body having self-lubricating property, the slidability between the second retainer member and the coil spring or the spring accommodating hole may be improved.

  Further, the central recess 88 formed in the lid fitting 84 does not necessarily have to be formed. For example, a portion of the lid fitting that covers the opening of the housing cylinder portion 72 may have a flat plate shape. In addition, the lid fitting is provided with a protrusion that protrudes inward in the longitudinal direction of the rod body 12, and a recess is provided at a position corresponding to the protrusion in the second resin retainer member 100. The second resin retainer member 100 may be positioned with respect to the lid fitting by being inserted into the recess.

  The present invention also relates to a fluid-filled vibration-proof connecting rod having, for example, a pressure receiving chamber and an equilibrium chamber in which an incompressible fluid is sealed, and an orifice passage that communicates the two chambers with each other. It can be adopted. As a result, it is possible to obtain an anti-vibration effect based on the fluid flow action against the compressive load, and to suppress vibration transmission by sharing the load with the coil spring against the tensile load.

  Further, the present invention is not only applied to the torque rod, but can be applied to various vibration-proof connecting rods. Furthermore, the present invention is not necessarily applied only to the anti-vibration connecting rod for automobiles, and can be suitably applied to anti-vibration connecting rods used for purposes other than automobiles such as trains. .

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

The top view which shows the torque rod as one Embodiment of this invention. II-II sectional drawing of FIG. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. VV sectional drawing of FIG. VI-VI sectional drawing of FIG. Sectional drawing which shows the torque rod as another one Embodiment of this invention. Sectional drawing which shows the torque rod as another one Embodiment of this invention.

Explanation of symbols

10: Torque rod for automobile, 12: Rod body, 14: First rubber bush, 16: Second rubber bush, 18: Upper divided plate bracket, 20: Lower divided plate bracket, 22: Small diameter opening, 24 : Small-diameter opening, 26: large-diameter opening, 28: large-diameter opening, 42: coupling cavity, 44: first outer cylinder, 46: second outer cylinder, 48: inner cylinder fitting, 50 : First main rubber elastic body, 52: inner shaft metal fitting, 58: stopper protrusion, 60: second main rubber elastic body, 66: second slit, 68: connecting rubber, 72: housing cylinder, 78 : Buffer rubber layer, 80: contact rubber film, 84: lid fitting, 88: central recess, 92: coil spring, 94: first resin retainer member, 98: guide tube, 100: second resin Retainer member made of 104, accommodation space

Claims (9)

The connecting portions are provided at both longitudinal ends of the rod body, and at least one of the connecting portions is elastically connected to each other by the main rubber elastic body with the inner shaft member inserted into the outer cylinder portion. In the anti-vibration connecting rod composed of the anti-vibration bush having a structure,
In the main rubber elastic body of the anti-vibration bush, a through slit is formed on the outer side in the longitudinal direction of the rod main body, and in the outer cylinder portion, on the outer side in the longitudinal direction of the rod main body with respect to the through slit. A spring receiving hole is formed at a position so as to extend in the longitudinal direction of the rod main body, and an inner peripheral surface of the spring receiving hole is covered with a buffer rubber layer integrally formed with the main rubber elastic body. Further, the opening on the outer cylinder part side of the spring accommodation hole is closed by a contact rubber part integrally formed with the main rubber elastic body, and the opening on the opposite side to the outer cylinder part side Is closed by a lid fitting that is caulked and fixed to the rod body, and a coil spring is disposed between the abutting rubber portion and the facing surface of the lid fitting and accommodated in the spring accommodating hole. On the other hand, a first retainer member is overlaid on one axial end of the coil spring, and a second retainer member is overlaid on the other axial end of the coil spring. One retainer member is made of resin, and the first retainer member is provided with a cylindrical guide portion that extends in the axial direction at the outer peripheral edge portion and covers the outer peripheral surface of the coil spring, An anti-vibration connecting rod, wherein the coil spring is compressed and deformed by causing the inner shaft member to abut against a corresponding rubber contact portion when inputting a tensile load in the longitudinal direction of the rod body.   A central recess is formed in the central portion of the lid fitting and opens toward the inside in the longitudinal direction of the rod body, and the first retainer member and the second retainer member are formed with respect to the central recess. The vibration-isolating connecting rod according to claim 1, wherein either one is fitted.   A central convex portion is formed at a central portion of at least one of the first retainer member and the second retainer member, and the central convex portion is fitted into an end portion of the central hole of the coil spring. Item 3. An antivibration connecting rod according to item 1 or 2.   The vibration isolating connecting rod according to any one of claims 1 to 3, wherein the second retainer member is made of resin.   The first retainer member is overlaid on an end portion of the coil spring on the outer tube portion side, and the second retainer member is overlaid on an end portion of the coil spring opposite to the outer tube portion. The vibration-isolating connecting rod according to any one of claims 1 to 4.   The inner shaft member is provided with an inner-side contact portion that is positioned opposite to the outer cylinder portion in the longitudinal direction of the rod body at a portion that is away from the contact rubber portion. The anti-vibration connecting rod according to claim 1.   A pair of inner-side contact portions are provided, and the pair of inner-side contact portions is the longitudinal length of the rod body with respect to a portion where the contact rubber portion of the outer cylinder portion is deviated on both sides in the circumferential direction. The anti-vibration connecting rod according to claim 6, wherein the anti-vibration connecting rod is opposed to each other in a direction.   Any one of the connecting portions is constituted by a first rubber bush in which the first inner shaft member and the first outer cylinder portion are elastically connected by the first main rubber elastic body, and any of the connecting portions The other is composed of a second rubber bushing in which the second inner shaft member and the second outer cylinder part are elastically connected by a second main rubber elastic body, the first rubber bush and the second rubber. The anti-vibration connecting rod according to any one of claims 1 to 7, wherein at least one of the bushes is the anti-vibration bush.   The rod body is configured by overlapping and fixing the first plate-shaped metal fitting and the second plate-shaped metal fitting, and the overlapping surface of the first plate-shaped metal fitting and the second plate-shaped metal fitting. A connecting space extending in the longitudinal direction of the rod body is formed between the first outer tube portion and the second outer tube portion, and a rubber elastic body filled in the connecting space The first main rubber elastic body and the second main rubber elastic body are formed into an integral molded structure, and the spring accommodating hole is formed between the first plate-like metal fitting and the second plate-like metal fitting. The anti-vibration connecting rod according to claim 8, wherein the anti-vibration connecting rod is formed so as to extend between the overlapping surfaces.

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