JP2008094248A - Torque rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque rod capable of reducing manufacturing cost by simplifying the fitting process of a dynamic damper. <P>SOLUTION: First and second vibration-isolating base bodies 13, 23 of first and second bushes 10, 20 are integrally vulcanization-molded with a connection vibration-isolating base body 32 of a dynamic damper 30 via a covering rubber part 62. Thus, troublesome works that a torque rod and a dynamic damper are separately manufactured (vulcanization-molded) like a conventional product, and the dynamic damper is fastened to the torque rod by caulking or the like after the manufacturing step need not be performed. A torque rod 100 with a dynamic damper 30 being fitted thereto can be easily manufactured (vulcanization-molded) in the step 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a torque rod to which a dynamic damper is mounted, and more particularly to a torque rod that can simplify the mounting process of the dynamic damper and reduce the manufacturing cost.

  Conventionally, for example, in an FF type vehicle, a torque rod is installed between the engine side and the vehicle body side of the vehicle, and the torque rod receives torque from the engine so Displacement is regulated. The torque rod also has a function of insulating vibration between the engine side and the vehicle body side.

  The torque rod is generally provided with a rod member (connecting member) made of a metal material, and anti-vibration bushes (first bush, second bush) connected to both ends of the rod. A rubber-like elastic material (first vibration isolation base, second vibration isolation base) is interposed between the inner cylinder and the outer cylinder.

  By the way, when the natural frequency of the torque rod matches the natural frequency of the vehicle body side member (body member), when the torque rod resonates due to, for example, idling vibration of the engine, the torque rod As a result, the vehicle body side member also resonates and causes noise and vibration, which causes discomfort to the passenger.

Therefore, for example, in Patent Document 1, a dynamic damper is provided on the rod member, and the natural frequency of the torque rod is made different from the natural frequency of the vehicle body side member, thereby suppressing the vehicle body side member from resonating. Is disclosed.
WO2002 / 042662 publication

  However, the above-described conventional torque rod has a configuration in which the dynamic damper and the rod member are fastened by caulking and fixing the engaging piece and inserting the engaging pin into the engaging hole. For this reason, the torque rod and the dynamic damper are manufactured separately (vulcanization molding), and then the dynamic damper is fastened and attached to the torque rod, so that the manufacturing process becomes complicated and the manufacturing cost increases accordingly. was there.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a torque rod capable of simplifying the mounting process of the dynamic damper and reducing the manufacturing cost.

  In order to achieve this object, the torque rod according to claim 1 includes a first bush attached to the engine side, a second bush attached to the vehicle body side, and a connection for connecting the first bush and the second bush to each other. A member and a dynamic damper attached to the connecting member, the displacement of the engine in the roll direction is restricted, and the first bush is a first inner cylinder attached to the engine side; A first outer cylinder located on the outer peripheral side of the first inner cylinder; and a first vibration isolation base interposed between the first inner cylinder and the first outer cylinder and made of a rubber-like elastic material. The second bush is interposed between the second inner cylinder attached to the vehicle body side, the second outer cylinder positioned on the outer peripheral side of the second inner cylinder, and the second inner cylinder and the second outer cylinder. And rubber elastic material And the connection member is a flat body configured integrally with the first outer cylinder and the second outer cylinder, and the first outer cylinder and the second outer cylinder. The dynamic damper includes a mass member configured as a mass body, a mass member configured as a mass body, and a mass member that covers an outer peripheral surface of the cylinder and the connection member. A first anti-vibration base and a second anti-vibration base, and the connected anti-vibration base is provided via the covering rubber portion. , Integrally vulcanized.

  A torque rod according to a second aspect is the torque rod according to the first aspect, wherein an outer peripheral surface of the mass member is covered with the covering rubber portion.

  The torque rod according to claim 3 is the torque rod according to claim 1 or 2, wherein the connecting member is formed by drilling the flat plate-like body in the plate thickness direction, and the first outer cylinder and the first rod. 2 having an opening located between facing the outer cylinder, the mass member being disposed at a position facing the opening, and a overlapping portion overlapping the upper surface of the connecting member in a top view of the connecting member The connection vibration isolating base is interposed between the upper surface of the connection member and the overlapping portion of the mass member.

  The torque rod according to claim 4 is the torque rod according to claim 3, wherein the mass member is formed in a rectangular parallelepiped shape, and the longitudinal direction of the rectangular parallelepiped is defined by the first inner cylinder and the second inner cylinder. Are arranged in the direction of the imaginary line connecting the two.

  The torque rod according to claim 5 is the torque rod according to claim 1 or 2, wherein the connecting member is formed by drilling the flat plate-like body in the plate thickness direction and the first outer cylinder. An opening located between the second outer cylinders, the mass member is located on an inner peripheral side of the opening, and the connection vibration isolating base includes an inner peripheral surface of the opening and the mass It is interposed between the outer peripheral surfaces of the members.

  According to the torque rod of the first aspect, when the torque rod is manufactured, first, the connecting member in which the first and second outer cylinders are integrally formed, the first and second inner cylinders, and the mass member are provided. After being placed in a vulcanization mold and clamped, a rubber-like elastic material is then injected into the vulcanization mold and vulcanized.

  As a result, the first and second inner cylinders and the first and second anti-vibration bases and the second anti-vibration base and the connected anti-vibration base are integrally vulcanized through the covering rubber portion. And the first and second bushes in which the first and second vibration isolation bases are interposed between the second outer cylinders, and the dynamic damper in which the connection vibration isolation base is interposed between the mass member and the connection member. Each is manufactured, and simultaneously with the manufacture, the operation of mounting the dynamic damper to the torque rod is completed.

  As described above, according to the torque rod of the present invention, the first and second vibration isolating bases of the first and second bushes and the connection vibration isolating base of the dynamic damper are integrally vulcanized and molded. It is necessary to manufacture the torque rod and the dynamic damper separately like each other (vulcanization molding), and after the manufacturing process, it is necessary to perform a complicated operation of fastening the dynamic damper to the torque rod by caulking or the like. In addition, a torque rod equipped with a dynamic damper can be easily manufactured (vulcanized) in one process. As a result, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  Here, the conventional product has a configuration in which the dynamic damper is fastened to the torque rod by caulking and engaging pins, etc., so that the fastening portion is liable to be loosened or displaced due to vibration, and the reliability is low. In addition, there is a problem in that the natural frequency changes accordingly and the vibration absorbing function as a dynamic damper cannot be exhibited stably.

  On the other hand, according to the torque rod of the present invention, since the connecting vibration-proof base of the dynamic damper is fixed directly to the connecting member of the torque rod by vulcanization adhesion, it is possible to cause loosening and displacement due to vibration. There is an effect that reliability can be improved by avoiding. As a result, there is an effect that the vibration absorption function as a dynamic damper can be stably exhibited by suppressing a change in the natural frequency due to loosening or the like.

  Further, according to the torque rod of the present invention, the covering rubber covers the connecting member between the first vibration isolating base of the first bush, the second vibration isolating base of the second bush, and the connection vibration isolating base of the dynamic damper. Therefore, when vulcanization molding is performed, only one injection hole is provided in the vulcanization mold, and each anti-vibration base is provided with a rubber covering portion. A rubber-like elastic material can be supplied. Therefore, there is no need to provide an injection hole for each vibration-proof substrate, and accordingly, the structure of the vulcanization mold can be simplified.

  According to the torque rod of the second aspect, in addition to the effect of the torque rod according to the first aspect, the outer peripheral surface of the mass member is covered by the covering rubber portion, so that the rust prevention treatment to the mass member is unnecessary. Therefore, there is an effect that the material cost and processing cost of the rust inhibitor can be reduced.

  According to the torque rod according to claim 3, in addition to the effect of the torque rod according to claim 1 or 2, the connecting member has an opening, and the mass member is arranged at a position facing the opening. Therefore, the mass member can be held and positioned through the opening of the connecting member in the vulcanization mold. For example, the first holding part of the lower mold holds the connecting member, and the second holding part of the lower mold passes through the opening of the connecting member and is positioned on the upper surface side of the connecting member. By configuring and holding the mass member with the second holding portion, the vulcanization mold can be divided vertically. As a result, even when the torque rod (first bush and second bush) and the dynamic damper are vulcanized and molded at the same time, the structure of the vulcanization mold is simplified to reduce the manufacturing cost and increase the production efficiency. There is an effect that improvement can be achieved.

  Further, according to the present invention, the mass member includes the overlapping portion that overlaps the upper surface of the connecting member in a top view of the connecting member, and the connection vibration isolating base is interposed between the overlapping portion and the upper surface of the connecting member. Therefore, there is an effect that the vibration absorbing function of the dynamic damper can be exhibited by utilizing the compression / tensile deformation of the coupled vibration-proof base with respect to the vibration input in the vehicle vertical direction.

  In other words, when the mass member is located between the first and second bushes (first and second outer cylinders), the connected vibration-isolating base is compared with the vibration input (displacement of the mass member) in the vehicle vertical direction. When it is necessary to have a large spring constant, tuning of the spring constant (natural frequency) can be facilitated by adopting a configuration in which such a connected vibration-proof base is subjected to compression / tensile deformation instead of shear deformation. In particular, when the first and second bushes (first and second vibration isolating bases) and the dynamic damper (connected vibration isolating base) are vulcanized and molded using the same rubber-like elastic material as in the present invention. This configuration is particularly effective for facilitating tuning.

  Although the mass member can be positioned not on the upper surface side of the connecting member but on the inner peripheral side of the opening, in this case, the opening is opened at least in an area larger than the outer shape of the mass member. Since it is necessary, it is difficult to secure the strength of the connecting member, and the durability is lowered. On the other hand, as in the present invention, if the mass member is positioned on the upper surface side of the connecting member, the opening area of the opening may be a minimum area that can hold the mass member. It is possible to ensure sufficient strength and improve durability.

  In addition, according to the present invention, the mass member is positioned between the first and second bushes (first and second outer cylinders), that is, the dynamic damper is disposed in a portion that originally becomes a dead space. The space rod can be effectively used to prevent the torque rod from becoming large.

  According to the torque rod of the fourth aspect, in addition to the effect produced by the torque rod according to the third aspect, the mass member is formed in a rectangular parallelepiped shape, and the longitudinal direction of the rectangular parallelepiped is defined by the first inner cylinder and the second inner cylinder. Therefore, there is an effect that it is possible to improve the vibration absorbing function of the dynamic damper while suppressing an increase in the size of the torque rod.

  According to the torque rod according to claim 5, in addition to the effect of the torque rod according to claim 1 or 2, the mass member is arranged at a position sandwiching the second outer cylinder between the first outer cylinder, That is, since the mass member is arranged at a position farther from the first outer cylinder (first bush), the vibration absorbing function can be improved while suppressing the increase in size and weight of the torque rod. effective.

  That is, in the torque rod, since the first bush has a relatively high spring constant compared to the second bush, the connecting member is a mode in which the second bush side is displaced in the vehicle vertical direction with the first bush as a fulcrum. It vibrates in (so-called swing mode).

  Therefore, by arranging the mass member at a position farther from the first outer cylinder (first bush) serving as the fulcrum (outside of the second bush), vibration in the swing mode can be efficiently performed with a mass member having a smaller mass. Has the effect of being able to be absorbed. As a result, the mass member can be reduced in size and weight, and accordingly, the torque rod as a whole can be reduced in size and weight.

  Here, when the mass member (dynamic damper) is arranged outside the second bush, the dynamic damper mounting structure needs to be downsized for the purpose of avoiding interference with other components. According to this configuration, the connecting member is provided with the opening, and the mass member is positioned (stored) on the inner peripheral side of the opening. Therefore, for example, compared to the case where the mass member is positioned on the upper surface of the connecting member. The space can be utilized more effectively while securing the mass of the mass member, and as a result, the dynamic damper mounting structure can be reduced in size.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a top view of the torque rod 100 according to the first embodiment of the present invention, and FIG. 2 is a bottom view of the torque rod 100. In the present embodiment, as an application target of the present invention, a torque rod that regulates displacement in the roll direction and the front-rear direction of the engine when the engine of the FF type vehicle is supported by three-point suspension will be described as an example.

  As shown in FIGS. 1 and 2, the torque rod 100 includes a first bush 10 attached to the engine side (right side of FIGS. 1 and 2, not shown) and a vehicle body side (left side of FIGS. 1 and 2, illustration). 2), a connecting member 61 (see FIG. 5) for connecting the first bush 10 and the second bush 20 to each other, and a dynamic damper 30 attached to the connecting member 61. It is configured to be able to regulate displacement in the roll direction of the engine and displacement in the front-rear direction during acceleration.

  As shown in FIG.1 and FIG.2, the 1st bush 10 is the 1st inner cylinder 11 attached to an engine side, and the 1st outer cylinder 12 (refer FIG. 5) located in the outer peripheral side of the 1st inner cylinder. The first vibration isolation base 13 is provided between the first inner cylinder 11 and the first outer cylinder 12 and is made of a rubber-like elastic material.

  As shown in FIGS. 1 and 2, the first inner cylinder 11 is made of aluminum alloy in a cylindrical shape, and is fastened and fixed to the engine side with a bolt through a through hole formed in the center. The first outer cylinder 12 (see FIG. 5) is formed of a steel material in a cylindrical shape, is configured integrally with a connecting member 61 described later, and is positioned on the outer peripheral side of the first inner cylinder 11 with a predetermined interval. . The first anti-vibration base 13 connects the first inner cylinder 11 and the first outer cylinder 12 over the entire circumference in the circumferential direction, and is connected to a covering rubber portion 62 described later (see FIG. 5). ).

  As shown in FIGS. 1 and 2, the second bush 20 includes a second inner cylinder 21 attached to the vehicle body side, and a second outer cylinder 22 (see FIG. 5) positioned on the outer peripheral side of the second inner cylinder. And a second vibration isolation base 23 that is interposed between the second inner cylinder 21 and the second outer cylinder 22 and is made of a rubber-like elastic material.

  As shown in FIGS. 1 and 2, the second inner cylinder 21 is formed from an aluminum alloy into a columnar body having a triangular shape in a top view, and is fastened to the vehicle body side with a bolt through a through hole formed in the center. Fixed. The second outer cylinder 22 (see FIG. 5) is formed of a steel material in a cylindrical shape, is configured integrally with a connecting member 61 described later, and is positioned on the outer peripheral side of the second inner cylinder 21 with a predetermined interval. . The second anti-vibration base 13 is configured to expand in the shape of a letter C when viewed from above, and is configured as a pair of rubber legs that connect the second inner cylinder 21 and the second outer cylinder 22 at two locations. It is configured to be connected to a covering rubber portion 62 described later (see FIG. 5).

  The connecting member 61 (see FIG. 5) is a member whose entire outer surface is covered with the covering rubber portion 62, and the metal member 60 (see FIGS. 3 and 5) together with the first outer cylinder 12 and the second outer cylinder 22 described above. 4). Here, the detailed configuration of the metal member 60 will be described with reference to FIGS. 3 and 4.

  FIG. 3 is a top view of the metal member 60, and FIG. 4 is a cross-sectional view of the metal member 60 taken along the line IV-IV in FIG. The bracket member 60 is configured by stacking a pair of metal plates made of a steel material, and as described above, the connecting member 61, the first outer cylinder 12, and the second outer cylinder 22 are integrally configured. .

  Specifically, as shown in FIGS. 3 and 4, the pair of metal plates are configured as vertically symmetrical metal plates in which half of the first and second outer cylinders 12 and 22 are formed in a cylindrical shape. One metal plate (upper side in FIG. 4) and the other metal plate (lower side in FIG. 4) are overlapped with each other in the upside down direction, and the fitting portion 61b is press-molded in that state, so that a pair of metals The plates are connected to form a metal member 60.

  As a result, as shown in FIGS. 3 and 4, the metal fitting member 60 includes the first and second outer cylinders 12 and 22 formed in a cylindrical shape, and the first and second outer cylinders 12 and 22 are flat plates. They are connected by a connecting member 61 having a shape. In addition, as shown in FIG. 3, the connecting member 61 has an opening 61a that has a long hole shape in a top view and is formed in the thickness direction.

  Returning to FIG. 1 and FIG. As shown in FIGS. 1 and 2, a dynamic damper 30 is mounted on the upper surface side (front side in FIG. 1) of the connecting member 61 (see FIG. 5) between the first bush 10 and the second bush 20. Has been. Here, the dynamic damper 30 will be described with reference to FIGS. 5 and 6.

  5 is a cross-sectional view of the torque rod 100 taken along the line VV of FIG. 1, and FIG. 6 is a cross-sectional view of the torque rod 100 taken along the line VI-VI of FIG. The dynamic damper 30 is a damper device for exhibiting a vibration absorbing function, and includes a mass member 31 and a connected vibration-proof base 32.

  The mass member 31 plays a role as a mass body, and is formed of a steel material in a rectangular parallelepiped shape. As shown in FIG. 6, the bottom surface of the rectangular parallelepiped (lower side surface in FIG. 6) is connected to the connecting member 61. It arrange | positions in the state spaced apart from the upper surface (upper side surface of FIG. 6) in parallel, and is arrange | positioned in the state spaced apart, and the connection anti-vibration base | substrate 32 mentioned later is interposed between this opposition.

  As shown in FIGS. 5 and 6, the mass member 31 is a virtual connecting the first inner cylinder 11 and the second inner cylinder 21 in the longitudinal direction of the rectangular parallelepiped (the horizontal direction in FIG. 5, the vertical direction in FIG. 6). It is arranged in the line direction (left and right direction in FIG. 5, vertical direction in FIG. 6) (see FIG. 1), and is arranged at a position corresponding to the opening 61 a of the connecting member 61.

  Here, the mass member 31 has an area (longitudinal dimension and width dimension) of the bottom surface (lower side surface in FIG. 6) from an opening area (longitudinal dimension and width dimension) of the opening 61 a opened in the connecting member 61. Is also configured to have a large area (long dimension value). Therefore, the mass member 31 has a portion (overlap portion) overlapping the upper surface (upper side surface in FIG. 6) of the connecting member 61 on the bottom surface (lower side surface in FIG. 6) in the top view of the connecting member 61. A connection anti-vibration base 32 to be described later is interposed between the upper surface of the member 61.

  The connection vibration isolating base 32 is an elastic body for elastically supporting the mass member 31 with respect to the connection member 61, and is composed of a rubber-like elastic material. As shown in FIGS. 5 and 6, the bottom surface of the mass member 31 is provided. (The lower side surface in FIG. 6) and the upper surface (the upper side surface in FIG. 6) of the connecting member 61 are connected to each other. That is, the connection vibration isolating base 32 is interposed between the overlapping portion formed in a frame shape in front view on the bottom surface of the mass member 31 and the upper surface of the connection member 61 as described above.

  As described above, according to the torque rod 100 in the present embodiment, the mass member 31 includes the overlapping portion that overlaps the upper surface of the connecting member 61 in the top view of the connecting member 61, and the overlapping portion and the upper surface of the connecting member 61. Since the coupled anti-vibration base 32 is interposed between the upper and lower sides (that is, the frame-like region in the top view), the compression of the coupled anti-vibration base 32 with respect to vibration input in the vehicle vertical direction (vertical direction in FIG. 6). The vibration absorbing function of the dynamic damper 30 can be exhibited using the tensile deformation.

  That is, when the mass member 31 is positioned between the first and second bushes 10 and 20 (first and second outer cylinders 12 and 22) as in the torque rod 100 in the present embodiment, Where it is necessary to provide a relatively large spring constant for the connection vibration isolating base 32 with respect to vibration input in the vehicle vertical direction (displacement of the mass member 31), the connection vibration isolating base 32 is not subjected to shear deformation. By adopting a configuration in which compression and tensile deformation is performed, tuning of the spring constant (natural frequency) can be facilitated.

  In particular, like the torque rod 100 in the present embodiment, the first and second bushes 10 and 20 (first and second vibration isolation bases 13 and 23) and the torque rod 100 (coupled vibration isolation base 32) are the same. In the case of vulcanization molding using a rubber-like elastic material, this configuration is particularly effective for facilitating tuning.

  Here, the mass member 31 can be positioned not on the upper surface side (or lower surface side) of the connecting member 61 but on the inner peripheral side of the opening 61a. In this case, at least the outer shape of the mass member 31 is used. It is necessary to open the opening 61a with an area larger than (longitudinal dimension and width dimension). Therefore, it is difficult to ensure the strength of the connecting member 61, and durability is reduced.

  On the other hand, if the mass member 31 is positioned on the upper surface side of the connecting member 61 as in the torque rod 100 in the present embodiment, the opening area of the opening 61a will be described later. As long as it has a minimum area that can be held in the vulcanization mold, the strength of the connecting member 61 can be sufficiently secured to improve the durability.

  Further, according to the torque rod 100 in the present embodiment, the mass member 31 is positioned between the first and second bushes 10 and 20 (first and second outer cylinders 12 and 22), that is, originally a dead space. Since the dynamic damper 30 is arranged at the portion to be, the space can be effectively utilized and the increase in the size of the torque rod 100 can be suppressed.

  Next, a method for manufacturing the torque rod 100 will be described with reference to FIGS. When manufacturing the torque rod 100, first, the connecting member 61 (that is, the metal fitting member 60 (see FIGS. 3 and 4)) in which the first and second outer cylinders 12 and 22 are integrally formed, and the first and second 2 After the inner cylinders 11 and 21 and the mass member 31 are installed in a vulcanization mold and clamped, a rubber-like elastic material is then injected into the vulcanization mold and vulcanized.

  As a result, as shown in FIGS. 5 and 6, the first anti-vibration base 13 and the second anti-vibration base 23 and the connected anti-vibration base 32 are integrally vulcanized through the covering rubber portion 62. As a result, the first and second antivibration bases 13 and 23 are interposed between the first and second inner cylinders 11 and 21 and the first and second outer cylinders 12 and 22. Each of the second bushes 10 and 20 and the dynamic damper 30 in which the connection vibration isolating base 32 is interposed between the mass member 31 and the connection member 61 can be manufactured. At the same time, the dynamic damper 30 is manufactured. The operation of mounting the to the torque rod 100 can also be completed.

  Thus, according to the torque rod 100 in the present embodiment, the first and second vibration isolation bases 13 and 23 of the first and second bushes 10 and 20 and the connection vibration isolation base 32 of the dynamic damper 30 are integrated. It is the structure which vulcanizes and molds. Therefore, as with conventional products, the torque rod and the dynamic damper are manufactured separately (vulcanization molding), and after the manufacturing process, the dynamic damper is fastened to the torque rod by caulking or the like. The torque rod 100 to which the dynamic damper 30 is attached can be easily manufactured (vulcanized) in one process. As a result, the manufacturing process can be simplified and the manufacturing cost can be reduced.

  In addition, the conventional product has a configuration in which the dynamic damper is fastened to the torque rod by caulking, engaging pins, or the like, so that the fastening portion is liable to be loosened or displaced due to vibration, and the reliability is low. At the same time, the natural frequency changes, and there is a problem that the vibration absorbing function as a dynamic damper cannot be stably exhibited.

  On the other hand, according to the torque rod 100 in the present embodiment, the connection vibration isolating base 32 of the dynamic damper 30 is directly fixed to the connection member 61 of the torque rod 100 by vulcanization adhesion. The occurrence of misalignment can be avoided and the reliability can be improved. As a result, it is possible to suppress the change in the natural frequency due to loosening and the like, and to stably exhibit the vibration absorbing function as the dynamic damper.

  Further, according to the torque rod 100 in the present embodiment, the first vibration isolation base 13 of the first bush 10, the second vibration isolation base 23 of the second bush 20, and the connected vibration isolation base 32 of the dynamic damper 30 are provided. Is vulcanized and molded integrally through the covering rubber portion 62 that covers the connecting member 61. Therefore, when vulcanizing and molding, only one injection hole is provided in the vulcanizing mold. A rubber-like elastic material can be supplied to the anti-vibration bases 13, 23 and 32 via the covering rubber part 62. Therefore, it is not necessary to provide an injection hole for each of the vibration isolating bases 13, 23, 32, and accordingly, the structure of the vulcanization mold can be simplified.

  Furthermore, since the outer peripheral surface of the mass member 31 can be covered with the covering rubber portion 62, the rust prevention treatment to the mass member 31 is not required, and the material cost and processing cost of the rust preventive agent are reduced accordingly. be able to.

  Here, according to the torque rod 100 in the present embodiment, the connecting member 61 includes the opening 61a, and the mass member 31 is disposed at a position facing the opening 61a. Inside, the mass member 31 can be held and positioned through the opening 61 a of the connecting member 61.

  For example, the connecting member 61 is held by the first holding portion of the lower die, and the second holding portion of the lower die passes through the opening 61a of the connecting member 61 in the holding state, and the upper surface side of the connecting member 61 ( A vulcanization mold can be made into a vertically divided structure by having a structure in which the mass member 31 is held by the second holding portion. As a result, even when the torque rod 100 (the first bush 10 and the second bush 20) and the dynamic damper 30 are vulcanized and molded at once, the structure of the vulcanization mold is simplified and the manufacturing cost is reduced. And improvement of production efficiency.

  Next, a second embodiment will be described with reference to FIGS. In the torque rod 100 in the first embodiment, the dynamic damper 30 is disposed between the first and second bushes 10 and 20 facing each other. However, in the torque rod 200 in the second embodiment, the dynamic damper 30 is the second. It is arranged outside the bush 20. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 7 is a top view of the torque rod 200 in the second embodiment. As shown in FIG. 7, the torque rod 200 in the second embodiment includes a first bush 10 attached to the engine side and a second bush 20 attached to the vehicle body side, as in the case of the first embodiment. And a connecting member 261 (see FIG. 9) for connecting the first bush 10 and the second bush 20 to each other, and a dynamic damper 230 mounted on the connecting member 261. It is comprised so that the displacement of the front-back direction can be controlled.

  The connecting member 261 (see FIG. 9) is a member whose entire outer surface is covered with the covering rubber portion 262, and is configured as a part of the metal fitting member 260 together with the first outer cylinder 12 and the second outer cylinder 22. Yes. Here, a detailed configuration of the metal fitting member 260 will be described with reference to FIGS. 8 and 9.

  8 is a top view of the metal fitting member 260, and FIG. 9 is a cross-sectional view of the metal fitting member 260 taken along the line IX-IX in FIG. Similarly to the case of the first embodiment, the metal fitting member 260 is configured by overlapping a pair of metal plates made of steel materials in opposite directions, and the connecting member 261, the first outer cylinder 12, and the second outer member. The tube 22 is integrally formed.

  Here, in the second embodiment, as shown in FIGS. 8 and 9, the metal fitting member 260 includes the third outer cylinder 242. The third outer cylinder 242 is an opening for accommodating the mass member 231, and is located with the second outer cylinder 22 sandwiched between the first outer cylinder 12. That is, as shown in FIG. 8, the third outer cylinder 242 is located on a virtual line connecting the first outer cylinder 12 and the second outer cylinder 22, and is disposed at a position that is outside the second outer cylinder 22. Has been.

  Returning to FIG. As shown in FIG. 7, a dynamic damper 230 is attached to the connecting member 61 (see FIGS. 8 and 9) outside the second bush 20. Here, the dynamic damper 230 will be described with reference to FIG.

  10 is a cross-sectional view of the torque rod 200 and corresponds to the cross-sectional view taken along the line IX-IX in FIG. Similar to the case of the first embodiment, the dynamic damper 230 is a damper device that exhibits a vibration absorbing function, and includes a mass member 231 and a connected vibration-isolating base 232.

  The mass member 231 serves to serve as a mass body, is formed of a steel material in a columnar shape, and is disposed on the inner peripheral side of the third outer cylinder 242 as shown in FIG. The connection vibration isolating base 232 is an elastic body for elastically supporting the mass member 231 with respect to the connection member 261, and is made of a rubber-like elastic material. A circumferential direction is formed between the mass member 231 and the third outer cylinder 242. It is connected to the covering rubber part 262 while being connected over the entire circumference.

  As described above, according to the torque rod 200 in the present embodiment, the configuration in which the mass member 231 is disposed at the position where the second outer cylinder 22 is sandwiched between the first outer cylinder 12, that is, the mass member 231 is the first one. Since it is the structure arrange | positioned in the position farther away from the 1 outer cylinder 12 (1st bush 10), the vibration absorption function can be improved, suppressing the enlargement and weight increase of the torque rod 200.

  That is, in the torque rod 200, since the first bush 10 has a relatively high spring constant compared to the second bush 20, the connecting member 261 uses the first bush 10 as a fulcrum and the second bush 20 side is the vehicle. It vibrates in a mode (so-called swing mode) that is displaced in the vertical direction (vertical direction in FIG. 10).

  Therefore, by arranging the mass member 231 at a position farther from the first outer cylinder 12 (first bush 10) serving as a fulcrum (outside of the second bush 20, left side of FIG. 10), vibration in the swing mode can be further reduced. The mass member 231 having a small mass can be efficiently absorbed. As a result, the mass member 231 can be reduced in size and weight, and accordingly, the torque rod 200 as a whole can be reduced in size and weight.

  Here, when the mass member 231 (dynamic damper 200) is disposed outside the second bush 20, it is necessary to reduce the mounting structure of the dynamic damper 230 for the purpose of avoiding interference with other components. According to the torque rod 200 in the present embodiment, the connecting member 261 is provided with the opening (the third outer cylinder 242), and the mass member 231 is positioned (accommodated) on the inner peripheral side of the third outer cylinder 242. Since it is a structure, compared with the case where the mass member 231 is located on the upper surface of the connection member 261, for example, space can be utilized more effectively while ensuring the mass of the mass member 231. As a result, dynamic The mounting structure of the damper 200 can be reduced in size.

  The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  For example, the numerical values given in the above embodiments are merely examples, and other numerical values can naturally be adopted.

  In the first embodiment, the connection vibration isolating base 32 is configured in a frame shape when the connection member 61 is viewed from above, that is, the four sides of the bottom surface of the mass member 31 are connected to the connection member 61 by the connection vibration isolation base 32. However, the present invention is not necessarily limited to this. For example, two sides (both ends in the longitudinal direction or both ends in the width direction) of the mass member 31 may be connected to the connecting member 61 by the connecting anti-vibration base 32. good.

  Although the case where the width dimension of the mass member 31 is configured to have the same width has been described in the first embodiment, the present invention is not necessarily limited thereto. For example, the width dimension of the mass member 31 is changed from one end side in the longitudinal direction. You may make it gradually widen toward the other end side. In this case, the wide side is disposed on the second bush 20 side, and the narrow side is disposed on the first bush 10 side. Accordingly, the vibration absorbing function can be more effectively exhibited by effectively utilizing the dead space and suppressing the enlargement of the torque rod 100 and bringing the center of gravity of the mass member 31 closer to the second bush 20 side. Can do.

  In the second embodiment, the case in which the connection vibration isolating base 232 connects the mass member 231 and the third outer cylinder 242 over the entire circumference in the circumferential direction has been described. The coupled vibration isolation base 232 may be configured as a rubber leg that couples the member 231 and the third outer cylinder 242 at a plurality of locations.

It is a top view of the torque rod in a 1st embodiment of the present invention. It is a bottom view of a torque rod. It is a top view of a metal fitting member. It is sectional drawing of the metal fitting member in the IV-IV line of FIG. It is sectional drawing of the torque rod in the VV line | wire of FIG. It is sectional drawing of the torque rod in the VI-VI line of FIG. It is a top view of the torque rod in 2nd Embodiment. It is a top view of a metal fitting member. It is sectional drawing of the metal fitting member in the IX-IX line of FIG. It is sectional drawing of a torque rod.

Explanation of symbols

100, 200 Torque rod 10 First bush 11 First inner cylinder 12 First outer cylinder 13 First vibration isolation base 20 Second bush 21 Second inner cylinder 22 Second outer cylinder 23 Second vibration isolation base 30, 230 Dynamic damper 31,231 Mass members 32,232 Linked vibration isolation base 61,261 Connection member 61a Opening 62,262 Covered rubber portion 242 Third outer cylinder (positioned with the second outer cylinder between the first outer cylinder and the second outer cylinder) Aperture)

Claims (5)

A first bush attached to the engine side; a second bush attached to the vehicle body; a connecting member that connects the first bush and the second bush to each other; and a dynamic damper attached to the connecting member, In the torque rod that regulates the displacement of the engine in the roll direction,
The first bush is interposed between a first inner cylinder attached to the engine side, a first outer cylinder located on the outer peripheral side of the first inner cylinder, and the first inner cylinder and the first outer cylinder. And a first vibration isolating base composed of a rubber-like elastic material,
The second bush is interposed between the second inner cylinder attached to the vehicle body side, the second outer cylinder located on the outer peripheral side of the second inner cylinder, and the second inner cylinder and the second outer cylinder. And a second vibration isolating base composed of a rubber-like elastic material,
The connecting member is a flat body configured integrally with the first outer cylinder and the second outer cylinder, and covers the outer peripheral surfaces of the first outer cylinder, the second outer cylinder, and the connecting member, and is rubbery. It has a covering rubber part made of elastic material,
The dynamic damper includes a mass member configured as a mass body, and a connection vibration isolating base interposed between the mass member and the connection member and configured from a rubber-like elastic material,
The torque rod, wherein the first vibration isolation base, the second vibration isolation base, and the connection vibration isolation base are integrally vulcanized through the covering rubber portion.   The torque rod according to claim 1, wherein an outer peripheral surface of the mass member is covered with the covering rubber portion. The connecting member includes an opening that is formed by drilling the flat plate member in the thickness direction and is positioned between the first outer cylinder and the second outer cylinder.
The mass member is disposed at a position facing the opening, and includes a superposed portion that overlaps the upper surface of the connecting member in a top view of the connecting member,
3. The torque rod according to claim 1, wherein the connection vibration isolating base is interposed between an upper surface of the connection member and an overlapping portion of the mass member.   The mass member is configured in a rectangular parallelepiped shape, and the longitudinal direction of the rectangular parallelepiped is arranged in a direction of an imaginary line connecting the first inner cylinder and the second inner cylinder. The torque rod according to claim 3. The connecting member includes an opening that is formed by drilling the plate-like body in the thickness direction and is positioned with the second outer cylinder between the first outer cylinder,
The mass member is located on the inner peripheral side of the opening,
3. The torque rod according to claim 1, wherein the coupling vibration-proof base is interposed between an inner peripheral surface of the opening and an outer peripheral surface of the mass member.

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