JP4491790B2 - Anti-vibration connecting rod - Google Patents

Description

  The present invention relates to an anti-vibration connecting rod incorporating an anti-vibration bush, which is preferably used for, for example, a torque rod for isolating and connecting a power unit to a support frame in an automobile.

  Conventionally, anti-vibration connecting rods are known as various rod members that are interposed between two members such as a torque rod in an automobile and connect them in anti-vibration manner. In such an anti-vibration connecting rod, in order to connect the two members while suppressing vibration transmission, the anti-vibration bush is generally structured to have an anti-vibration bush assembled to the end of the hard rod body. It is designed to be attached to each member via a vibration isolating bush. Such an anti-vibration connecting rod is shown, for example, in FIG. 4 of Japanese Patent Application Laid-Open No. 2004-316798.

  By the way, in such an anti-vibration connecting rod, an anti-vibration bush in which the inner shaft metal fitting and the outer cylinder metal fitting are connected by a rubber elastic body is adopted, and the outer cylinder metal fitting is fixed to the rod main body, while the inner shaft member Is attached to the connection target member. And the anti-vibration effect with respect to a vibration is exhibited by the elastic deformation effect | action of the main body rubber elastic body of this anti-vibration bush.

  However, with such a conventional anti-vibration connecting rod, since the anti-vibration effect is only exhibited by the rubber elastic body of the anti-vibration bush, the required anti-vibration characteristics are sufficiently and stable. And sometimes difficult to achieve. In particular, in the vibration-proof rubber bush, it is difficult to sufficiently secure a linear region of the spring characteristic of the main rubber elastic body due to the size restriction due to the allowable arrangement space. For this reason, when the input load to the vibration isolating connecting rod increases, the spring constant of the main rubber elastic body increases nonlinearly, resulting in a problem that the vibration isolating performance is remarkably lowered due to the high dynamic spring.

  In order to realize the improvement of the vibration isolation effect, Patent Document 2 (Japanese Utility Model Laid-Open No. 61-120602) proposes that the rod body has a fluid sealing structure including a cylinder mechanism. However, if the rod body has a hollow fluid sealing structure, the structure becomes complicated and manufacturing becomes extremely difficult, the strength of the rod body tends to decrease, and maintenance and durability against leakage of the sealed fluid are problematic. It is easy to become. For this reason, such a fluid sealing structure is not realistic.

JP 2004-316798 A Japanese Utility Model Publication No. 61-120602

  Here, the present invention has been made in the background as described above, and the problem to be solved is to avoid an increase in the size and weight of the rod body with a simple structure, while applying a load. Can improve the linearity of the spring characteristics, and by effectively realizing a low dynamic spring under the input of a heavy load, it has a novel structure that can exhibit an excellent anti-vibration effect. It is to provide a connecting rod.

  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 first aspect of the present invention, a connecting portion is provided at each end portion in the longitudinal direction of the rod body, and at least one of the connecting portions has a bush assembly hole. In the anti-vibration connecting rod in which the anti-vibration bush is assembled and the inner shaft member constituting the anti-vibration bush is elastically connected to the rod body by the main rubber elastic body, the inner shaft member is sandwiched in the direction perpendicular to the axis. it is located on at least one side, with the central axis with respect to a straight line connecting the connecting portion of the both end portions is a coil spring disposed in parallel in the rod body, the said vibration damping bushing In the main rubber elastic body, a pocket portion is formed by opening on the outer peripheral surface thereof, and one end portion of the coil spring is inserted into the pocket portion to be accommodated. Are, when the inner shaft member is caused to relative displacement in the axis-perpendicular direction with respect to the bushing assembly hole, the load in the compression direction with respect to the coil spring with the rubber elastic body is brought into elastic deformation It is characterized in that

  In the anti-vibration connecting rod having such a structure according to this aspect, by arranging the coil spring, at least a part of the axial load applied to the rod body is shared by the coil spring. Yes. As a result, it is possible to reduce the elastic deformation of the main rubber elastic body and the non-linear high dynamic spring of the coil spring as a whole when a large load is applied. In other words, by using a coil spring that can obtain the linearity of the spring characteristics in a long stroke region at a high level and easily, the load is shared by the coil spring, so that the spring constant can be rapidly increased even under a large load input. The rise can be prevented.

  The coil spring is applied to an anti-vibration connecting rod having an anti-vibration bush attached to at least one end, and the coil spring is centered in the axial direction of the rod body (the linear extension direction connecting the pair of connecting portions). Since the shaft is arranged to extend, it is possible to avoid a load from acting in a direction inclined with respect to the central axis of the coil spring. Therefore, the stable expression of the target spring constant can be achieved, and the stable display of the excellent anti-vibration performance can be realized.

  The second aspect of the present invention is the anti-vibration connecting rod according to the first aspect, wherein the main rubber elastic body is provided on both sides of the inner shaft member of the anti-vibration bush sandwiched in one direction perpendicular to the axis. It is characterized in that a hollow portion penetrating in the axial direction is formed.

  In the anti-vibration connecting rod having the structure according to this aspect, by forming the hollow portion penetrating the main rubber elastic body in the axial direction so as to sandwich the inner shaft member in one direction perpendicular to the axis, The contribution of the spring component of the main rubber elastic body can be reduced or avoided, and the spring of the coil spring becomes more dominant. Therefore, it is possible to more advantageously prevent a rapid increase in the spring constant particularly when a heavy load is applied.

  According to a third aspect of the present invention, in the anti-vibration connecting rod according to the second aspect, the coil spring is disposed on the opposite side of the inner shaft member across the lightening portion, and the coil The spring is spaced from the inner shaft member, and the end surface of the coil spring on the inner shaft member side is covered with the main rubber elastic body.

  In the anti-vibration connecting rod having such a structure according to this aspect, the coil spring is disposed so as to be separated from the inner shaft member in the direction perpendicular to the axis, so that when a small load is input, the anti-vibration rod is provided. A low dynamic spring can be achieved by deformation of the main rubber elastic body in the bush. Therefore, the vibration reduction effect at the time of inputting a small amplitude vibration can be more effectively exhibited. In addition, when the end surface on the inner shaft member side of the coil spring is covered with the main rubber elastic body, even when the coil spring and the inner shaft member are relatively displaced so as to approach and come into contact with each other by the input of a load, It is possible to effectively prevent the occurrence of contact sound.

  According to a fourth aspect of the present invention, in the vibration isolating connecting rod according to any one of the first to third aspects, the main rubber elastic body in the vibration isolating bush includes the main rubber elastic body. A pocket portion that is open to the outer peripheral surface is formed, while the rod body is formed with an accommodation recess connected to the opening of the pocket portion that opens to the inner peripheral surface of the bushing assembly hole. The coil spring is disposed in the accommodated state across both the pocket portion and the accommodating recess.

  In the anti-vibration connecting rod having the structure according to this embodiment, the free length in the axial direction of the coil spring can be set large without increasing the diameter of the anti-vibration bush. Therefore, it is possible to ensure a large degree of freedom in designing the coil spring and the vibration isolating bush.

  Further, according to a fifth aspect of the present invention, in the vibration proof connecting rod according to any one of the first to fourth aspects, the vibration proof bush is assembled to any one of the connecting portions. A ball joint is provided on either one of the connecting portions.

  In the anti-vibration connecting rod having such a structure according to this aspect, the anti-vibration bush is assembled to one of the connecting portions, and the ball joint is provided to the other, so that it acts on the rod body. The load to be damped can be more advantageously limited in the axial direction of the rod body, and the load can be more skillfully received by the coil spring. Therefore, the low dynamic spring can be realized more advantageously, and the vibration isolation performance can be improved.

  According to a sixth aspect of the present invention, in the vibration proof connecting rod according to any one of the first to fifth aspects, the vibration proof bush includes an outer cylinder member on an outer peripheral surface of the main rubber elastic body. Is fixed, and the outer cylinder member is press-fitted and fixed to the bushing assembly hole.

  In the anti-vibration connecting rod having the structure according to this aspect, the anti-vibration bush can be easily assembled to the rod body by fixing the outer cylinder member to the outer peripheral surface of the main rubber elastic body.

  In particular, this aspect can be adopted in combination with the fourth aspect. In such a combination with the fourth aspect, a window portion formed through the outer cylinder member is provided, and the window portion is aligned with a pocket portion formed in the main rubber elastic body. As a result, the pocket portion is opened to the outer peripheral surface of the outer cylindrical member through the window portion, and the inner peripheral surface of the bushing assembly hole in the housing recess in the assembled state of the outer cylindrical member with respect to the bushing assembly hole. The opening of the pocket portion and the opening of the receiving recess are communicated with each other through the window formed in the outer cylindrical member, and the coil extends over both the pocket portion and the receiving recess. It is possible to adopt a mode in which the spring is disposed in the accommodated state.

  According to a seventh aspect of the present invention, in the vibration proof connecting rod according to any one of the first to sixth aspects, at least a part of the rod body is configured by overlapping two press fittings. The coil spring is disposed in the accommodated state between the overlapping surfaces of the two press fittings.

  In the anti-vibration connecting rod having the structure according to this aspect, a rod body that tends to have a complicated shape can be obtained relatively easily by configuring the rod body by overlapping two press fittings. .

  In addition, according to an eighth aspect of the present invention, in the vibration-isolating connecting rod according to any one of the first to sixth aspects, the rod main body is configured as an integrally molded product, and the rod main body includes A mounting hole extending outward from the bushing assembly hole is formed therethrough, and a cover member that covers an outer opening of the mounting hole is fixed to the rod body, and one end in the axial direction is secured by the cover member. The coil spring is arranged in a state of being inserted into the mounting hole in a supported state.

  In the anti-vibration connecting rod having such a structure according to the present embodiment, the rod body can be easily obtained without providing a special reinforcing structure by configuring the rod body as an integrally molded product. I can do it.

  In addition, the coil spring is inserted and disposed in the mounting hole formed in the rod body, and the coil spring can be easily attached to the rod body in the accommodated state by mounting a cover member that covers the opening of the mounting hole. I can do it. Therefore, productivity can be improved.

  As is clear from the above description, the vibration-isolating connecting rod having the structure according to the present invention has a simple structure and avoids an increase in the size and weight of the rod body, and the linearity of the spring characteristics under load input. In particular, it is possible to exhibit an excellent anti-vibration effect by effectively realizing a low dynamic spring under the input of a large load.

  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 4 show a torque rod 10 for an automobile which is an anti-vibration connecting rod as a first embodiment of the present invention. The torque rod 10 has a first rubber bush 14 as a vibration isolating bush attached to one side in the longitudinal direction with respect to the longitudinal rod main body 12 and the vibration damping bush as the other side in the longitudinal direction. The second rubber bush 16 is attached. And while the 1st rubber bush 14 is attached to the power unit of the motor vehicle which is not illustrated, the torque rod 10 is attached between the power unit and the vehicle body by the second rubber bush 16 being similarly mounted on the vehicle body of the motor vehicle which is not illustrated. It is mounted so that the torque reaction force of the power unit is bufferedly transmitted to the vehicle body while suppressing vibration transmission from the power unit to the vehicle body. In the following description, the vertical direction means the vertical direction in FIG.

  More specifically, the rod main body 12 according to the present embodiment has an upper divided plate metal member 18 and a lower divided plate metal member 20 as press fittings each having substantially the same shape throughout the whole. It is set as the division | segmentation structure comprised by overlapping. Each of these upper and lower divided metal parts 18 and 20 is shown in a plan view in the assembled state as shown in FIG. 1 and as shown in FIG. 4 in a longitudinal sectional view in the assembled state. The whole has a substantially constant thin plate shape, and has a substantially long flat plate shape as a whole. Note that each of the divided plate metal members 18 and 20 has one longitudinal side on which the first rubber bush 14 is provided (the right side in FIGS. 1 to 4) and the other longitudinal direction on which the second rubber bush 16 is provided. The plate width dimension is gradually reduced toward this side (left side in FIGS. 1 to 4).

  The upper and lower divided metal plates 18 and 20 have circular large-diameter openings 22 and 24 formed at corresponding positions near one end portion in the longitudinal direction, and near the other end portion in the longitudinal direction. Circular small-diameter openings 26 and 28 are formed at positions corresponding to each other.

  Furthermore, in the upper and lower divided plate metal members 18 and 20, arrangement portions 30 and 32 extending in the longitudinal direction with a substantially semicircular cross section are opened in the overlapping surface at positions corresponding to substantially central portions in the longitudinal direction. It is formed as follows. The end portions on one side in the longitudinal direction of the placement portions 30 and 32 are connected to the large diameter openings 22 and 24. The openings in the overlapping surfaces of the disposing portions 30 and 32 are covered with each other by overlapping the upper and lower divided metal plates 18 and 20, thereby accommodating recesses extending in the longitudinal direction of the rod body 12 with a substantially circular cross section. An arrangement recess 34 is formed on the rod body 12. Further, the arrangement recess 34 is opened by connecting the other end in the longitudinal direction to the large-diameter openings 22 and 24.

  Further, the upper divided plate member 18 is integrally formed with a first upper divided cylindrical portion 36 that protrudes upward at a predetermined height from the inner peripheral edge of the large-diameter opening 22 and has a small-diameter opening. A second upper divided cylindrical portion 38 that protrudes upward from the inner peripheral edge of the portion 26 at a predetermined height is integrally formed.

  On the other hand, the lower divided plate member 20 is integrally formed with a first lower divided cylindrical portion 40 that protrudes downward from the inner peripheral edge of the large-diameter opening 24 at a predetermined height. Further, the lower divided plate member 20 is integrally formed with a second lower divided cylindrical portion 42 that protrudes downward from the inner peripheral edge of the small-diameter opening 28 at a predetermined height.

  Here, the upper and lower divided plate fittings 18 and 20 having the above-described structure are formed by punching a metal plate such as a stainless steel plate having a flat shape into an appropriate shape, and by pressing the upper and lower first and second divided plates. The cylindrical portions 36, 38, 40, 42 and the upper and lower arrangement portions 30, 32 are formed advantageously by press molding. In particular, by forming the upper and lower divided plate fittings 18 and 20 with such a press fitting, the rod body 12 can be formed thin and compact while ensuring sufficient strength and dimensional accuracy, and excellent. High productivity can be realized. Moreover, in addition to the fact that the upper and lower first and second divided cylindrical portions 36, 38, 40, 42 can be arbitrarily set in the radial dimension, the axial dimension, etc., the upper and lower arrangement portions 30, 32 It is possible to set the shape and position to be formed with a large degree of freedom and easily form it.

  As shown in FIG. 4, the upper and lower divided plate brackets 18 and 20 are superposed vertically in the thickness direction over the entire surface and fixed to each other, whereby an integral rod A main body 12 is formed. At the time of such superposition, the upper and lower divided plate fittings 18 and 20 are bonded to each other by spot welding or the like, so that the upper and lower divided plate fittings 18 and 20 are fixed inseparably.

  The rod body 12 formed in this manner is on a single axis orthogonal to the overlapping surfaces of the upper and lower divided plate metal members 18 and 20 by the cooperation of the first upper and lower divided cylindrical portions 36 and 40. A first assembling cylinder portion 44 is formed as an extending large-diameter cylindrical bushing assembling hole, and the upper and lower divided plate metal fittings are cooperated by the second upper and lower divided cylindrical portions 38 and 42. A second assembly cylinder portion 46 is formed as a small-diameter cylindrical bush assembly hole extending on one axis orthogonal to the overlapping surface. Thereby, the connection part is formed in the longitudinal direction both ends of the rod main body 12, and the bush assembly | attachment hole is each formed in each connection part especially in this embodiment.

  In addition, a bush body 48 that constitutes the second rubber bush 16 is set in the second assembly cylinder portion 46.

  As shown in FIGS. 3 and 4, the bush main body 48 is spaced a predetermined distance radially outward from the inner tube fitting 50 as an inner shaft member having a thick and small-diameter cylindrical shape. An outer cylinder fitting 52 as an outer cylinder member having a thin-walled large-diameter cylindrical shape is disposed on substantially the same central axis, and between the inner cylinder fitting 50 and the outer cylinder fitting 52 in the radial direction. A main rubber elastic body 54 having a substantially thick cylindrical shape is interposed, and an inner cylinder metal fitting 50 and an outer cylinder metal fitting 52 are vulcanized and bonded to the inner and outer peripheral surfaces of the main rubber elastic body 54, respectively. It is formed as a product. In the present embodiment, the inner cylindrical metal fitting 50 has an axial dimension larger than that of the outer cylindrical metal fitting 52, and the inner cylindrical metal fitting 50 projects from the openings on both axial sides of the outer cylindrical metal fitting 52. Has been.

  The bush body 48 is press-fitted and fixed to the upper and lower small-diameter openings 26 and 28 in the upper and lower divided metal plates 18 and 20. Thereby, the bush main body 48 has the outer cylinder fitting 52 fitted to the second assembled cylinder part 46 and is fixedly assembled to the second assembled cylinder part 46. is there. Note that, in such an assembled state, the inner cylinder fitting 50 is elastically connected to the rod main body by the main rubber elastic body 54.

  Furthermore, a bush body 56 constituting the first rubber bush 14 is set in the first assembly cylinder portion 44.

  As shown in FIGS. 3 and 4, the bush main body 56 is thin with a predetermined distance radially outward from the inner tube fitting 58 as an inner shaft member having a thick and small-diameter cylindrical shape. An outer cylindrical member 60 as an outer cylindrical member having a large-diameter cylindrical shape is disposed, and a generally thick cylindrical shape is formed between the radially opposing surfaces of the inner cylindrical member 58 and the outer cylindrical member 60 as a whole. The main rubber elastic body 62 is interposed, and is formed as an integrally vulcanized molded product in which the inner cylinder fitting 58 and the outer cylinder fitting 60 are vulcanized and bonded to the inner and outer peripheral surfaces of the main rubber elastic body 62, respectively. In the present embodiment, the inner cylinder fitting 58 and the outer cylinder fitting are arranged such that the central axis of the inner cylinder fitting 58 is offset from one side in the longitudinal direction of the rod body 12 with respect to the center axis of the outer cylinder fitting 60. 60 are positioned relative to each other.

  Also, the main rubber elastic body 62 has a first slit 64 as a hollow portion that is located on one side of the inner cylinder 58 in the direction perpendicular to the axis and extends in the circumferential direction with a predetermined length of less than a half circumference. On the other side in the direction perpendicular to the axis across the inner cylinder fitting 58, there is a second slit 66 as a hollow portion extending with a predetermined length of less than a half circumference in the circumferential direction. It is formed to penetrate in the axial direction.

  Further, the main rubber elastic body 62 is formed with a pocket portion 68 so as to be located on the other side of the second slit 66 sandwiched in the direction perpendicular to the axis. The pocket portion 68 is formed so as to extend in the radial direction with a substantially circular cross section, and is formed so that an end portion on one side thereof does not reach the second slit 66, and on the other side. The end is opened on the peripheral wall surface of the main rubber elastic body 62. Thereby, in the main rubber elastic body 62, the portion constituting the bottom wall surface of the pocket portion 68 (the portion that partitions the pocket portion 68 and the second slit 66 in the direction perpendicular to the axis) is made thin. In addition, a window portion 70 is formed in the outer tube fitting 60 at a position corresponding to the opening portion of the pocket portion 68, and the pocket portion 68 is opened to the outer peripheral surface of the bush main body 56 through the window portion 70. .

  The bush main body 56 is attached to the rod main body 12 by press-fitting the bush main body 56 into the upper and lower large-diameter openings 22 and 24 in the upper and lower divided metal plates 18 and 20. Thereby, the bush main body 56 has its outer cylindrical fitting 60 fixedly assembled to the first assembled cylindrical portion 44. Note that, in such an assembled state, the inner cylinder fitting 58 is elastically connected to the rod main body 12 by the main rubber elastic body 62.

  Further, under the assembled state of the bushing body 56 with respect to the rod body 12, the bushing body 56 is rotated around its central axis so that the opposing direction of the first and second slits 64, 66 of the bushing body 56 is the longitudinal direction of the rod body 12. Is aligned with the rod body 12 in the circumferential direction.

  Further, under the assembled state of the bush main body 56 with respect to the rod main body 12, the pocket portion 68 (window portion 70) of the bush main body 56 is positioned to open toward the first assembled cylinder portion 44 in the longitudinal direction of the rod main body 12. It has been. Further, in the present embodiment, the shape and size of the opening of the pocket portion 68 and the window portion 70 are the same as the shape and size of the opening of the arrangement recess 34 formed in the rod body 12, Under the assembled state of the bushing body 56 with respect to the rod body 12, the bushing body 56 is positioned in the circumferential direction around its central axis, whereby the pocket portion 68 is connected to the arrangement recess 34 through the window portion 70. ing. Thereby, in the rod main body 12 and the bush main body 56, an accommodating portion 72 extending in the longitudinal direction of the rod main body 12 with a substantially constant circular cross section is formed.

  Here, a compression type coil spring 74 is disposed in the accommodating portion 72 in the accommodated state. The coil spring 74 has a substantially constant rectangular cross-sectional shape, and as is apparent from the above description, is disposed between the overlapping surfaces of the upper and lower divided plate members 18 and 20 constituting the rod body 12. Has been. The coil spring 74 is disposed on one side of the first rubber bush 14 that sandwiches the inner cylinder fitting 58 in the direction perpendicular to the axis, and the central axis thereof is the large-diameter openings 22, 24 and the small-diameter openings 26, 28 is arranged so as to extend in the longitudinal direction of the rod main body 12 (the axial direction of the rod main body 12), which is a direction parallel to the straight line connecting the two.

  The coil spring 74 has one axial end projecting from the pocket portion 68, and one axial end surface is in contact with the main rubber elastic body 62 at the pocket 68. The other end portion in the direction is accommodated in the arrangement recess 34, and the other end surface in the axial direction is brought into contact with the upper and lower divided metal plates 18 and 20 in the arrangement recess 34. Thereby, the deformation in the extension / contraction direction of the coil spring 74 in the longitudinal direction of the rod body 12 is allowed by the relative displacement of the inner cylinder fitting 58 and the outer cylinder fitting 60 in the direction perpendicular to the axis at the time of vibration input. Yes.

  In particular, the coil spring 74 in the present embodiment is disposed on the opposite side of the inner cylinder fitting 58 with the second slit 66 sandwiched in the direction perpendicular to the axis, and is thinned by providing the second slit 66. The coil spring 74 and the inner cylinder fitting 58 are spaced apart in the direction perpendicular to the axis via a part of the main rubber elastic body 62. Furthermore, in the present embodiment, the coil spring 74 in the assembled state has a substantially free length, so that stress and deformation that are applied to the main rubber elastic body 62 by being pressed by the coil spring 74 are reduced. Thus, the durability of the main rubber elastic body 62 can be improved. In addition, the coil spring 74 is disposed such that the outer peripheral surface thereof is slightly spaced from the peripheral wall surface constituting the accommodating portion 72 over the entire circumference. As a result, the sliding friction at the time of expansion / contraction deformation of the coil spring 74 can be reduced or avoided, and smooth deformation can be realized.

  Thus, in the torque rod 10 having the above-described structure, the rod main body 12 is interposed between the inner cylinder fitting 50 and the inner cylinder fitting 58 of the first and second rubber bushes 14 and 16 in the mounted state. When vibration is exerted in the longitudinal direction, a vibration-proofing effect based on the elastic deformation of the main rubber elastic bodies 54 and 62 in the first and second rubber bushes 14 and 16 is exhibited. In addition, in particular, the inner cylinder fitting 50 and the inner cylinder fitting 58 of the first and second rubber bushes 14 and 16 are arranged in the longitudinal direction of the rod body 12 (the main vibration input direction, the first rubber bushing 14 and the second rubber bushing 14 being the main vibration input direction). The inner cylinder fitting 58 and the outer cylinder fitting 60 (first assembled cylinder portion 44) of the second rubber bush 16 are connected to the rod body. Since the coil spring 74 is relatively displaced in the longitudinal direction 12 and is compressed and deformed in the axial direction, a vibration isolation effect based on the elastic deformation of the coil spring 74 is exhibited.

  In the torque rod 10 having such a structure according to the present embodiment, the input load applied in the axial direction (longitudinal direction) of the rod body 12 is applied to each of the first rubber bush 14 and the second rubber bush 16. Not only the elastic deformation of the main rubber elastic bodies 54 and 62 but also the coil spring 74 disposed on the rod main body 12 is elastically shared and supported. Here, the coil spring 74 is highly and easily obtained in a long stroke region in which the linearity of the spring characteristics is long. Therefore, the spring component of the torque rod 10 (main rubber elastic bodies 54 and 62, particularly when large amplitude vibration is input). And the spring constant of the coil spring 74 as a whole) can be prevented from increasing in a non-linear manner, and excellent vibration isolation performance can be obtained.

  In the present embodiment, the coil spring 74 extends in the longitudinal direction of the rod body 12, which is a linear extending direction connecting the central axis of the first rubber bush 14 and the central axis of the second rubber bush 16 in the direction perpendicular to the axis. A compression type coil spring 74 is assembled to the rod body 12 so that the central axis extends. Therefore, in the torque rod 10 in which the load is applied mainly in the axial direction, it is advantageously avoided that the load applied to the coil spring 74 is applied in an inclined direction with respect to the central axis direction of the coil spring 74. Thus, the effect of linearizing the spring constant by arranging the coil spring 74 can be stably obtained.

  Further, in the main rubber elastic body 62 of the first rubber bush 14, the first and second main rubber elastic bodies 62 are penetrated in the axial direction on both sides of the rod main body 12 sandwiching the inner cylinder fitting 58 in the longitudinal direction. Two slits 64 and 66 are formed. Thereby, the contribution of the spring component of the main rubber elastic body 62 in the longitudinal direction of the rod main body 12, which is the load input direction, can be reduced or avoided. Furthermore, the elastic deformation of the main rubber elastic body 62 at the time of load input can provide a substantially linear spring characteristic over a relatively wide stroke area by forming the first and second slits 64 and 66. Therefore, it is possible to realize a low dynamic spring over a wide stroke region more advantageously. In addition, since the spring component due to the shear deformation is smaller than the spring component in the case of compressive deformation or tensile deformation, the contribution rate of the coil spring 74 can be further increased, and linear spring characteristics can be obtained.

  Further, the rod main body 12 is configured by superposing the upper divided plate fitting 18 and the lower divided plate fitting 20 which are press fittings. Thereby, the rod main body 12 which has a complicated shape can be obtained easily. In particular, in the present embodiment, the arrangement recess 34 in which the coil spring 74 is accommodated is also formed between the overlapping surfaces of the upper divided plate metal member 18 and the lower divided plate metal member 20. By assembling 74 before the upper divided plate metal member 18 and the lower divided plate metal member 20 are overlapped, it can be easily assembled to the rod body 12 in the accommodated state.

  Further, in the present embodiment, a pocket portion 68 is provided for the main rubber elastic body 62, and the pocket portion 68 is communicated with the disposition recess 34 through the window portion 70 formed in the outer cylinder fitting 60. An accommodating portion 72 for accommodating and arranging the coil spring 74 is formed. Thereby, the free length in the axial direction of the coil spring 74 can be set with a large degree of freedom, and the setting of the spring characteristics corresponding to the required characteristics can be advantageously realized.

  Next, FIGS. 5 to 9 show a torque rod 76 for an automobile which is an anti-vibration connecting rod as a second embodiment of the present invention. In the torque rod 76, an integrally formed metal fitting formed by die casting or the like is employed as the rod body 78 having a long shape. In the following description, members or parts that are substantially the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed descriptions thereof are given. Is omitted.

  More specifically, the rod main body 78 has a long thick plate shape extending substantially linearly as a whole, and in particular in the present embodiment, the rod main body 78 is formed as an integrally molded product made of a metal material such as aluminum. The rod body 78 is provided with a first assembly cylinder portion 82 as a large-diameter cylindrical bush assembly hole having a circular large-diameter opening 80 in the vicinity of one end portion in the longitudinal direction. A first rubber bushing 84 is formed as an anti-vibration bushing in the present embodiment by using the first assembly cylinder portion 82, and a circular small-diameter opening 86 is formed in the vicinity of the other end portion in the longitudinal direction. A second assembly cylinder portion 88 as a small-diameter cylindrical bush assembly hole is provided, and the second assembly cylinder portion 88 is used as a second vibration isolation bush in this embodiment. A rubber bush 90 is formed. The first assembly cylinder portion 82 and the second assembly cylinder portion 88 are connected by the arm portion 92 formed integrally with the first assembly cylinder portion 82 and the second assembly cylinder portion 88. As a result, the rod body 78 according to the present embodiment is formed. The arm portion 92 is formed so as to gradually become narrower in a plan view from the first assembly cylinder portion 82 side to the second assembly cylinder portion 88 side, and is gradually thicker in a side view. It is formed to be meat. In addition, the arm portion 92 is provided with a flange-shaped reinforcing portion 94 that extends to both sides in the width direction (up and down in FIG. 5) in plan view.

  In addition, an arrangement hole 96 as a mounting hole is provided on the end surface on one side in the longitudinal direction of the rod body 78. The arrangement hole 96 is a circular hole extending in the longitudinal direction of the rod body, and one end portion in the longitudinal direction is opened on the end surface on one side in the longitudinal direction of the rod body 78 and the other end portion in the longitudinal direction. Is connected to the large-diameter opening 80.

  Further, as described above, the second rubber bushing 90 in the present embodiment is formed using the second assembled cylinder portion 88. As shown in FIGS. 8 and 9, the second rubber bush 90 has an inner cylindrical metal fitting 98 as an inner shaft member having a thick and small-diameter cylindrical shape with respect to the first assembled cylindrical portion 82. The main rubber elastic body 100 having a substantially thick cylindrical shape as a whole is disposed between the radially inner surfaces of the inner cylindrical fitting 98 and the first assembled cylindrical portion 82. It is formed by interposing.

  Furthermore, the bush main body 56 constituting the first rubber bush 84 is set in the first assembly cylinder portion 82. Since the bush main body 56 has substantially the same structure as the bush main body (56) shown in the first embodiment, the description thereof is omitted here to avoid redundant description. In this embodiment, the bush main body 56 is assembled to the rod main body 78 so as to be displaced from the first embodiment by about 180 degrees in the circumferential direction. The rod body 78 is formed on the other side in the longitudinal direction of the rod body 78 (second rubber bushing 90 side), and the second slit 66 is disposed in the longitudinal direction of the rod body 78 with the inner cylinder bracket 58 interposed therebetween. It is formed on one side (first rubber bush 84 side).

  Then, the bush main body 56 is press-fitted into the large-diameter opening 80 in the rod main body 78, so that the outer cylinder fitting 60 is fitted to the first assembled cylinder 82, and the bush main body 56 is connected to the rod. It is attached to the main body 78. In this embodiment, as shown in FIGS. 8 and 9, the direction of the central axis of the first rubber bush 84 and the direction of the central axis of the second rubber bush 90 are shifted by approximately 90 degrees. Each rubber bush 84, 90 is provided.

  In addition, when the bush body 56 is assembled to the rod body 78, the bush body 56 has its central axis so that the opposing direction of the first and second slits 64, 66 of the bush body 56 is the longitudinal direction of the rod body 78. It is aligned with the rod body 78 in the circumferential direction.

  Further, under the assembled state of the bush main body 56 with respect to the rod main body 78, the longitudinal direction in which the pocket portion 68 (window portion 70) in the bush main body 56 is on the first assembled cylinder portion 82 side in the longitudinal direction of the rod main body 78. The bush main body 56 is positioned in the circumferential direction so as to open toward one side, and is assembled to the rod main body 78. Further, in this embodiment, the shape and size of the opening of the pocket portion 68 and the window portion 70 are the same as the shape and size of the opening of the arrangement hole 96 formed in the rod main body 78, and the bush Under the assembled state of the main body 56 with respect to the rod main body 78, the pocket portion 68 is connected to the arrangement hole 96 through the window portion 70.

  Here, a coil spring 74 is disposed in the disposition hole 96. The coil spring 74 is disposed so that the central axis of the coil spring 74 extends in the longitudinal direction of the rod body 78, and the end of one side in the axial direction of the coil spring 74 is disposed in the disposition hole 96 in the rod body 78. And the end on the other side in the axial direction is projected from the mounting hole 96 in the rod main body 78 toward the other side in the longitudinal direction. It is accommodated in a pocket portion 68 connected to 96.

  Further, a cover member 102 that is superposed in the longitudinal direction is attached to an end face on one side (right side in FIG. 5) of the rod body 78 in the axial direction. The cover member 102 is substantially cup-shaped in the lateral direction, and is attached so as to cover a portion of the coil spring 74 that protrudes from the rod body 78 in the state in which the coil spring 74 is disposed on the rod body 78. . In addition, a fixing portion 104 having a substantially rectangular flange shape that extends outward in the width direction (vertical direction in FIG. 5) is integrally formed in the opening, and the fixing portion 104 is formed on one side of the rod body 78. The cover member 102 is fixedly assembled to the rod main body 78 by being superposed on the end face on the side and being bolted to the four corners of the rod main body 78. As a result, the opening on one side in the axial direction of the arrangement hole 96 is covered with the cover member 102, and the accommodating portion 106 is formed by the cooperation of the cover member 102, the pocket portion 68, and the arrangement hole 96. ing. And the coil spring 74 is arrange | positioned with respect to this accommodating part 106 and the rod main body 78 in the accommodated state. In the present embodiment, one end face in the axial direction of the coil spring 74 is brought into contact with the main rubber elastic body 62 in the pocket portion 68 and the other end face in the axial direction is brought into contact with the cover member 102. The expansion and contraction of the coil spring 74 is allowed in the longitudinal direction of the rod main body 78 in accordance with the elastic deformation of the main rubber elastic body 62.

  Also in the torque rod 76 structured according to this embodiment, the coil spring 74 is disposed on the rod body 78 in substantially the same manner as in the first embodiment, so that it is linear even when a large load is input. The input load is shared by the coil spring 74 having excellent spring characteristics that exhibit the characteristics, and a low dynamic spring can be realized when a large load is input.

  In particular, in the present embodiment, the rod main body 78 is an integrally molded product obtained by die casting or the like, while the arrangement hole 96 is provided on the end surface on one side of the rod main body 78, The coil spring 74 is disposed in the inserted state, and the cover member 102 is attached to the end surface on one side of the rod body 78 so as to cover the opening of the disposition hole 96, whereby the coil spring 74 is disposed in the accommodated state. It is set up. Thereby, the assembly in the accommodation state of the coil spring 74 with respect to the rod main body 78 can be performed easily.

  Moreover, by making the rod main body 78 into an integrally molded product, a high-strength rod main body 78 can be easily obtained, and durability and reliability can be improved.

  Next, FIGS. 10 and 11 show a torque rod 108 for an automobile which is an anti-vibration connecting rod as a third embodiment of the present invention. The torque rod 108 according to this embodiment is provided at substantially both ends in the longitudinal direction of the rod body 12 which is a divided structure configured by superposing the upper divided plate fitting 18 and the lower divided plate fitting 20. In the first assembly cylinder portion 44 and the second assembly cylinder portion 46, the first assembly cylinder portion 44 is provided with the first rubber bush 14, while the second assembly cylinder portion 44. 46 is provided with a ball joint 110. In the following description, members or portions that are substantially the same as those of the first or second embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  More specifically, the ball joint 110 includes a joint cylinder fitting 112 and a holder cylinder member 114. The joint cylinder fitting 112 has a substantially cylindrical shape with a thick and small diameter as a whole. In addition, the outer dimensions of the axial center portion of the joint tube fitting 112 are gradually increased toward the axial center, and the axial center portion of the joint tube bracket 112 is a spherical portion 116 having a substantially spherical curved surface. Yes. In the present embodiment, the inner diameter dimension of the joint tube fitting 112 is substantially constant over the entire length in the axial direction.

  Further, the holder cylinder member 114 has a thin cylindrical shape with a large diameter as a whole, and is formed of a hard synthetic resin material particularly in the present embodiment. In addition, a ball-shaped fitting concave groove 118 having a shape corresponding to the surface shape of the spherical portion 116 formed in the central portion of the joint tube fitting 112 is formed in the central portion of the holder tube member 114 in the axial direction. Yes.

  The joint cylinder fitting 112 and the holder cylinder member 114 are arranged substantially coaxially, and the joint cylinder fitting 112 is inserted into the holder cylinder member 114. In short, the spherical portion 116 in the joint tube fitting 112 and the fitting groove 118 in the holder tube member 114 are fitted together, whereby the joint tube fitting 112 and the holder tube member 114 are assembled to each other, and the ball in the present embodiment. A joint 110 is configured. Note that both end portions in the axial direction of the holder tube member 114 are spaced apart from each other in the direction perpendicular to the axis of the joint tube fitting 112, so that the displacement of the joint tube member 112 in the twisting direction is easily allowed. Yes.

  The ball joint 110 having such a structure is fitted in an inserted state, for example, when the holder cylinder member 114 is press-fitted into the second assembly cylinder portion 46 of the rod body 12. In the present embodiment, the joint cylinder fitting 112 and the holder cylinder member 114 constituting the ball joint 110 are both formed of a hard material, and the joint cylinder fitting 112 and the holder cylinder member 114 are formed of the spherical portion 116. At least a part of the fitting groove 118 is directly overlapped and assembled to each other. Moreover, the holder cylinder member 114 which comprises the ball joint 110 is directly assembled | attached with respect to the rod main body 12 (2nd assembly cylinder part 46). In other words, the ball joint 110 is configured to include a hard joint barrel metal fitting 112 and a holder barrel member 114 assembled without substantially interposing a buffer member such as a rubber elastic body. On the other hand, it is attached without using a buffer member such as a rubber elastic body.

  Then, under such a mounting state of the ball joint 110, the first rubber bush 14 provided at one end in the longitudinal direction of the rod body 12 is attached to a power unit of an automobile not shown, and the other end in the longitudinal direction. Similarly, the ball joint 110 attached to the part is attached to the vehicle body of the automobile (not shown), so that the torque rod 108 is assembled to the automobile as in the first embodiment.

  In the torque rod 108 having such a structure according to the present embodiment, one end of the torque rod 108 is assembled to the automobile by the ball joint 110 so that a load applied to the rod body 12 is applied to the shaft of the torque rod 108. Therefore, the load sharing by the coil spring 74 can be realized more advantageously. Therefore, it is possible to more advantageously realize a low dynamic spring particularly under a large load input.

  In the present embodiment, the joint cylinder fitting 112 and the holder cylinder member 114 of the ball joint 110 are both formed of a hard material, and the joint cylinder fitting 112 and the holder cylinder member 114 are provided with a cushioning material or the like. It is connected so that it can be slid directly. And the holder cylinder member 114 is directly assembled | attached to the 2nd assembly cylinder part 46 of the rod main body 12 formed with the hard material, without passing through a shock absorbing material etc. As a result, it is possible to advantageously avoid rigid resonance of the torque rod 108, which is likely to cause a problem when vibration is input in a specific frequency range. That is, the ball joint 110 having the above-described structure is provided for the second assembly cylinder portion 46 that is one of the connecting portions, and one end of the torque rod 108 is attached to the vehicle body by the ball joint 110. As a result, the rigidity in the axial direction of the torque rod 108 (longitudinal direction of the rod body 12) at the location where the ball joint 110 is disposed is sufficiently increased, and the resonance frequency at which rigid body resonance occurs is substantially increased. It can be set to a high frequency range that cannot be a problem.

  Next, FIGS. 12 and 13 show a torque rod 120 for an automobile which is an anti-vibration connecting rod as a fourth embodiment of the present invention. In the torque rod 120 according to the present embodiment, the first assembly cylinder portion 82 and the second assembly cylinder portion 88 provided at substantially both ends in the longitudinal direction of the rod body 122 that is an integrally molded product, One assembly cylinder portion 82 is provided with a first rubber bush 84, while the second assembly cylinder portion 88 is provided with a ball joint 110. In the following description, members or parts that are substantially the same as those in any of the first to third embodiments are denoted by the same reference numerals in the drawings, and the description is given here. Omitted.

  More specifically, the rod main body 122 has a structure in which the first assembly cylinder portion 82 and the second assembly cylinder portion 88 are connected by the arm portion 92, similarly to the rod main body 78 in the second embodiment. have. Moreover, in the rod main body 122 in the present embodiment, unlike the rod main body 78 in the second embodiment, the central axis of the first assembly cylinder portion 82 and the central axis of the second assembly cylinder portion 88 are substantially parallel. These assembly cylinder parts 82 and 88 are formed so as to be. The first assembly cylinder portion 82 is provided with a first rubber bushing 84 having substantially the same structure as that of the second embodiment, and the second assembly cylinder portion 88 is provided with the third assembly. A ball joint 110 having the structure shown in the embodiment is provided, and both end portions in the longitudinal direction of the rod main body 122 are not shown in the figure through the first rubber bush 84 and the ball joint 110, respectively. Connected to the body.

  Even in the torque rod 120 having the structure according to this embodiment, the same effects as those shown in the second and third embodiments are effectively exhibited.

  As mentioned above, although some 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 first to fourth embodiments, the rod main bodies 12 and 78 extending substantially linearly are illustrated, but the rod main body does not necessarily have a linear shape and is curved. May be. When a curved rod body is employed, the rod body is parallel to a straight line connecting the central axes of the large diameter openings 22 and 24 and the small diameter openings 26 and 28 formed at both ends in the longitudinal direction of the rod body. By arranging the coil spring 74 on the rod body so that the central axis extends in the direction, the main input load can be effectively shared by the coil spring 74.

  Further, as shown in the first to fourth embodiments, the main rubber elastic body 62 constituting the first rubber bushes 14 and 84 has the first and second slits 64 and 66 in the main body. Although it is desirable to form the rubber elastic body 62 so as to penetrate in the axial direction in order to obtain an effect such as linearization of the spring characteristics, the slits 64 and 66 may be omitted.

  In addition, the shape, size, cross-sectional shape, and the like of the coil spring 74 are appropriately set according to the required spring characteristics and the like, and are limited by specific examples in the above embodiments. It is not a thing.

  Further, in the first and third embodiments, the rod body 12 is a divided structure formed by the upper divided plate metal fitting 18 and the lower divided plate metal fitting 20 over the entire body. In the case of a split structure, it is not always necessary to have a split structure over the entire rod body, and a part of the rod body may have a split structure. Specifically, for example, only the portion where the coil spring is disposed in the rod main body can be formed as a divided structure, and the upper divided plate metal fitting can be formed as a lid-like member that covers the housing portion. According to this, since the rod body is formed of an integrally molded product over substantially the whole, the strength of the rod body can be obtained advantageously, and the coil spring housing portion has a split structure, so that the coil spring Can be easily assembled to the rod body in the accommodated state.

  Further, when the ball joint is employed, in order to effectively obtain the effect of preventing the rigid body resonance, it does not have a spring component like the ball joint 110 shown in the third and fourth embodiments. Although it is desirable, not only a ball joint having a structure not including a spring component is necessarily employed. For example, a ball joint in which a buffer layer is provided between the spherical contact portion 116 of the joint tube fitting 112 and the sliding contact surface of the fitting groove 118 of the holder tube member 114, or the outer peripheral surface of the holder tube member 114 and the second assembled tube It is also possible to employ a ball joint or the like in which a buffer layer is disposed between the fitting surfaces of the portions 46 and 88 with the inner peripheral surface.

  Further, the number of the coil springs 74 disposed on the rod main bodies 12, 78, 122 is not necessarily one, and a plurality of coil springs 74 may be provided. Specifically, for example, in the torque rod 10 shown in the first embodiment, the arrangement recess 34 is provided on the inner peripheral surfaces of the large diameter openings 22 and 24 to which the first rubber bush 14 is assembled. And a second disposition recess that opens in a portion that is opposed to the surface in the radial direction, and is similar to the housing portion 72 of the first disposition recess 34 with respect to the second disposition recess. It is also possible to accommodate and arrange the coil spring while forming the accommodating portion. As a result, in the first rubber bush 14, one coil spring 74 is assembled on each side in the direction perpendicular to the axis across the inner cylinder fitting 58. Further, even when the inner cylinder fitting 58 is relatively displaced to either side in the rod central axis direction, the compression elastic force by the coil spring can be exhibited.

  Further, in the torque rod 10 shown in the first embodiment, a coil spring can be incorporated into the second rubber bush 16. In that case, for example, a second rubber bush having the same structure as that of the first rubber bush 14 may be employed. Alternatively, in the second rubber bush 16, a through window is formed in the outer cylinder fitting 52, and a pocket portion is formed in the rod body 12 so as to open to the inner surface of the small diameter opening portion 28 in the rod central axis direction. A coil spring is accommodated in the pocket portion. This urging force of the coil spring can be exerted via the main rubber elastic body 54 when the inner tubular fitting 50 is relatively displaced in the direction perpendicular to the axis in the rod central axis direction.

  In each of the above embodiments, the bush body 56 formed by connecting the inner cylinder fitting 58 and the outer cylinder fitting 60 with the main rubber elastic body 62 is formed separately from the rod bodies 12, 76, 108, 120. The first rubber bushes 14 and 84 are configured by press-fitting and fixing the bush main body 56 to the rod main bodies 12, 76, 108 and 120. 56 does not necessarily need to include the outer tube fitting 60.

  Specifically, for example, a bush main body formed by attaching a thick, substantially cylindrical main rubber elastic body 62 to the inner cylinder fitting 58 with respect to the first assembly cylinder portion 44 of the rod main body 12. It is also possible to constitute the first rubber bush by press-fitting and fixing. Such a structure is particularly effective when the rod body 12 having a divided structure as shown in the first embodiment is employed. In the case where the first rubber bush has a structure that does not have the outer cylinder fitting 60 as described above, the main rubber elastic body 100 in the second embodiment shown in FIG. Protrusions that project in the direction perpendicular to the axis are provided at both ends of the rubber elastic body in the axial direction, and the projecting parts are overlapped in close contact with the first assembly cylinder portion 44 in the axial direction, whereby the bushing body is rod It can be positioned and fixed advantageously in the axial direction with respect to the main body 12.

  Further, by directly vulcanizing and bonding the main rubber elastic body to the rod main body, it is also possible to obtain a first rubber bush in which the inner cylinder fitting and the rod main body are elastically connected by the main rubber elastic body. Specifically, for example, a state in which the inner cylinder fitting 58 is arranged at a predetermined distance from the first assembly cylinder part 82 on the inner peripheral side of the first assembly cylinder part 82 formed in the rod body 78. Then, the rod body 78 and the inner cylinder fitting 58 are set in a molding die, and the body rubber elastic body 62 is vulcanized between the opposing surfaces of the rod body 78 and the inner cylinder fitting 58, whereby the rod body 78 and the inner cylinder fitting 58 are formed. You may comprise the 1st rubber bush to which the cylinder metal fitting 58 was elastically connected. Such a structure is suitable when a rubber bush that does not have the outer cylinder fitting 60 is employed in the rod body 78 formed by an integrally molded product as shown in the second embodiment.

  In each of the above embodiments, the coil spring 74 is disposed in the rod main body 12, 76, 108, 120 in the accommodated state, but the coil spring 74 is, for example, the inner cylinder fitting 58 and the outer cylinder in the bush main body 56. It may be disposed between the surfaces facing the metal fitting 60 in the direction perpendicular to the axis. By adopting such a structure, the operation of assembling the coil spring 74 to the rod body 12, 76, 108, 120 is not required, and the bush body 56 is assembled to the rod body 12, 76, 108, 120. The coil spring 74 can be easily assembled to the rod main bodies 12, 76, 108, 120.

  In each of the above embodiments, the coil spring 74 is disposed outward in the direction perpendicular to the bush axis with respect to the second slit 66 formed in the main rubber elastic body 62. It may be disposed between the inner cylinder fitting 58 and the second slit 66 in the direction perpendicular to the axis.

  The coil spring 74 does not necessarily have a substantially free length in an assembled state without load input, and may be assembled in a compressed state, for example.

  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.

It is a top view which shows the torque rod as 1st embodiment of this invention. It is a side view which shows the torque rod shown by FIG. FIG. 3 is a transverse sectional view showing the torque rod shown in FIG. 1, corresponding to a section taken along line III-III in FIG. 2. It is a longitudinal cross-sectional view which shows the torque rod shown by FIG. 1, Comprising: It is a figure corresponded in the IV-IV cross section in FIG. It is a top view which shows the torque rod as 2nd embodiment of this invention. FIG. 6 is a side view showing the torque rod shown in FIG. 5. FIG. 6 is a rear view showing the torque rod shown in FIG. 5. FIG. 7 is a transverse sectional view showing the torque rod shown in FIG. 5, corresponding to a VIII-VIII section in FIG. 6. It is a longitudinal cross-sectional view which shows the torque rod shown by FIG. 5, Comprising: It is a figure equivalent to the IX-IX cross section in FIG. It is a cross-sectional view showing a torque rod as a third embodiment of the present invention, and is a view corresponding to the XX cross section in FIG. FIG. 11 is a cross-sectional view showing the torque rod shown in FIG. 10, corresponding to a XI-XI cross section in FIG. 10. FIG. 14 is a transverse sectional view showing a torque rod as a fourth embodiment of the present invention, and is a view corresponding to the XII-XII section in FIG. 13. FIG. 13 is a transverse cross-sectional view showing the torque rod shown in FIG. 12, corresponding to the XIII-XIII cross section in FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Torque rod 12 Rod main body 14 1st rubber bush 16 2nd rubber bush 34 Disposition recess 44 1st assembly cylinder part 46 2nd assembly cylinder part 56 Bushing body 58 Inner cylinder metal fitting 62 Main body rubber elasticity Body 74 Coil spring

Claims (8)

A connecting portion is provided at each longitudinal end portion of the rod body, and at least one of the connecting portions has a bush assembly hole, and a vibration isolating bush is assembled to the bush assembly hole. In an anti-vibration connecting rod in which an inner shaft member constituting the anti-vibration bush is elastically connected to the rod body by a main rubber elastic body,
Located on at least one side across the inner shaft member in a direction perpendicular to the axis, the coil spring so that the central axis is parallel arranged with respect to a straight line connecting the connecting portion of both end portions in the rod body and along with that,
In the main rubber elastic body of the vibration isolating bush, an opening is formed on the outer peripheral surface thereof to form a pocket portion, and one end portion of the coil spring is inserted into and accommodated in the pocket portion,
When the inner shaft member is relatively displaced in the direction perpendicular to the shaft with respect to the bushing assembly hole, the main rubber elastic body is elastically deformed and a load in the compression direction is applied to the coil spring. Anti-vibration connecting rod, characterized in that
  2. The anti-vibration connecting rod according to claim 1, wherein a hollow portion penetrating the main rubber elastic body in the axial direction is formed on both sides of the inner anti-vibration bush sandwiching the inner shaft member in one direction perpendicular to the axis. .   The coil spring is disposed on the opposite side of the inner shaft member with the lightening portion interposed therebetween, and the coil spring is spaced from the inner shaft member, and the inner shaft member of the coil spring is disposed. The vibration-isolating connecting rod according to claim 2, wherein an end face on the side is covered with the main rubber elastic body.   The main rubber elastic body in the vibration isolating bush has a pocket portion that opens to the outer peripheral surface of the main rubber elastic body, while the rod main body has an accommodation recess connected to the opening of the pocket portion. The opening is formed in the inner peripheral surface of the bushing assembly hole, and the coil spring is disposed in the accommodated state across both the pocket portion and the accommodating recess. The vibration-isolating connecting rod according to any one of 3.   The anti-vibration connection according to any one of claims 1 to 4, wherein the anti-vibration bush is assembled to any one of the connection parts, and a ball joint is provided to the other one of the connection parts. rod.   6. The vibration isolating bushing, wherein an outer cylinder member is fixed to an outer peripheral surface of the main rubber elastic body, and the outer cylinder member is press-fitted and fixed to the bushing assembly hole. The anti-vibration connecting rod according to claim 1.   The at least one part of the said rod main body is comprised by overlapping two press metal fittings, The said coil spring is arrange | positioned in the accommodation state between the overlapping surfaces of these two press metal fittings. The anti-vibration connecting rod according to any one of 6. The rod body is formed as an integrally molded product, and a mounting hole extending outward from the bushing assembly hole is formed in the rod body, and a cover member that covers an outer opening of the mounting hole is provided. The coil spring is disposed in the mounting hole in a state of being fixed to the rod body and having one end in the axial direction supported by the cover member. The anti-vibration connecting rod according to Item.

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