JP2010137709A - Vibration control connecting rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a mold structure of an injection molding mold, while securing sealing property of a resin material during injection molding of a rod body. <P>SOLUTION: A first vibration control bush 18 is provided in a first cylindrical part 12 of the rod body 16 made of the resin material. The first vibration control bush 18 is provided with an outer cylinder metal fitting 30. The outer cylinder metal fitting 30 is connected and held to the inside of the first cylindrical part 12 by injection molding of the rod body 16. Swollen parts 43 swollen to the outside of an axial direction X1 from the axial direction end face 12A of the first cylindrical part 12 are provided at both end parts 30A of the axial direction of the outer cylinder metal fitting 30. Each of the swollen parts 43 is made as a seal part of the resin material during the injection molding of the rod body 16, a mold surface 68 of the injection molding mold 60 is pressed on an outer peripheral surface 43A of each swollen part 43, and the first cylindrical part 12 is injected and molded, while sealing the resin material over the entire periphery between the outer peripheral surface and the mold surface 68. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an anti-vibration connecting rod that can be used as, for example, a torque rod for connecting an automobile engine to a vehicle body while preventing vibration.

  An anti-vibration connecting rod called a torque rod is provided between an automobile body and an engine which is a vibration generation source in order to suppress movement and vibration in the roll direction of the engine. Such an anti-vibration connecting rod generally includes a pair of anti-vibration rods provided in each cylindrical portion of the rod body, including a rod body having cylindrical portions at both ends in the longitudinal direction, an inner cylindrical bracket and a rubber-like elastic portion. A bush, and is attached to the engine or the vehicle body using the inner cylinder fitting as an attachment member.

  In recent years, there has been a strong demand for weight reduction of automobiles, and it has been proposed that the rod body be formed of a resin material as a means for reducing the weight (see Patent Document 1 below). When the rod body is made of a resin material, the vibration-proof bushing is set in the mold with a vibration-proof base made of a rubber elastic body pre-cured on the outer peripheral surface of the inner cylinder fitting. Is molded and held integrally in the cylindrical portion.

  This type of anti-vibration connecting rod includes a parallel type in which the pair of anti-vibration bushes are oriented in the same direction and an orthogonal type in which the pair of anti-vibration bushes are oriented in a direction perpendicular to each other. . Among these, in the case of a parallel type anti-vibration connecting rod, the mold dividing direction of the injection mold of the rod body can be set in the axial direction in both the pair of anti-vibration bushes or cylindrical portions, so the mold structure is There is no problem of complexity.

  On the other hand, in the case of the orthogonal type anti-vibration connecting rod, when the dividing direction of the pair of anti-vibration bushes or cylindrical parts is set in the axial direction, the dividing directions of both are 90 degrees different from each other. The injection mold of the main body becomes complicated. In Patent Document 2 below, in order to solve this problem, the shape of the rubber elastic body in the vibration isolating bush on the small diameter side is set such that at least the outer surface in the axial direction of the outer peripheral portion is axially outer than the axial end surface of the cylindrical portion of the rod body. It has been proposed to form a substantially solid shape that does not have a straight portion. However, with this measure, it is not possible to provide a straight portion on the vibration isolating base in the vibration isolating bush on the small diameter side. Further, since the mold is not split in the axial direction on the small diameter side, the cylindrical portion cannot be formed. Therefore, it is not possible to make a press fit type in which the vibration isolating bush on the small diameter side is press-fitted after the injection molding of the rod body. Thus, in the measure of Patent Document 2, the configuration of the vibration isolating bush on the small diameter side is limited.

Patent Document 3 below discloses a configuration in which an outer cylinder fitting is added to the vibration-proof bushing and is joined and held in the resin cylindrical portion via the outer cylinder fitting. However, in Patent Document 3, the outer cylinder fitting of the vibration-proof bushing held in the cylindrical portion of the rod body is formed such that the axial end is expanded radially outwardly in a flange shape, and this flange portion is the cylindrical portion. It is molded so as to be embedded inside. Therefore, when the rod body is injection-molded, the resin material is sealed against the vibration-proof bushing by pressing the injection mold against the end of the rubber vibration-proof base. Therefore, the sealing performance may be impaired. Further, the torque rod disclosed in Patent Document 3 is of the parallel type, and the above problem that the mold structure of the injection molding die of the rod body is complicated does not occur in the first place.
Japanese Patent Laid-Open No. 8-233030 JP 2005-265122 A JP 2006-292074 A

  The present invention has been made in view of the above points, and in the orthogonal type anti-vibration connecting rod, while providing a degree of freedom in the configuration of one anti-vibration bush (for example, the anti-vibration bush on the small diameter side) An object of the present invention is to simplify the mold structure of an injection mold while ensuring the sealing performance of a resin material at the time of injection molding of a rod body.

The vibration-isolating connecting rod according to the present invention includes a rod body made of a resin material having a first cylindrical portion at one end and a second cylindrical portion at the other end, and a first body provided in the first cylindrical portion. An anti-vibration connection comprising an anti-vibration bush and a second anti-vibration bush provided in the second cylindrical portion, wherein the first anti-vibration bush and the second anti-vibration bush are oriented in a direction perpendicular to each other In the rod
The first anti-vibration bush includes a first inner cylinder fitting that is arranged in parallel to the first cylindrical portion, an outer cylinder fitting that surrounds the first inner cylinder fitting, and the first inner fitting. And a first anti-vibration base made of a rubber-like elastic body that is interposed between the outer cylindrical fittings and connects the two,
The outer cylinder fitting is joined and held in the first cylindrical portion by injection molding of the rod body, and both axial ends of the outer cylinder fitting are axially outward from the axial end face of the first cylindrical portion. It is characterized by being protruded on the side.

  In the anti-vibration connecting rod having such a configuration, the protruding portions at both axial end portions of the outer cylinder fitting are injected onto the outer peripheral surface of the protruding portion as a sealing portion of the resin material at the time of injection molding of the rod body. The first cylindrical portion can be injection-molded while pressing the mold surface of the mold and sealing the resin material over the entire circumference between the outer peripheral surface and the mold surface. Therefore, for the first cylindrical portion that holds the first vibration isolating bush, the mold splitting direction can be set in the direction perpendicular to the axis. Therefore, in the second cylindrical portion provided with the second vibration isolating bush, The direction can be set to the axial direction. Therefore, in the second vibration isolating bush, the second vibration isolating base can be provided with an axial straight portion, or the second tubular portion can be formed first, so that the second vibration isolating bush can be a press-fit type. Therefore, it is possible to simplify the mold structure of the injection mold while providing a degree of freedom in the configuration of the second anti-vibration bush while being an anti-vibration connecting rod of the orthogonal type.

  In particular, when the resin material is sealed by directly pressing the mold surface of the injection mold onto the protruding part of the rigid outer cylinder fitting, sealing performance is ensured without losing the injection pressure of the resin material. Can enhance the effect.

  In the vibration-isolating connecting rod, the outer peripheral surface of the outer cylindrical metal fitting is covered with an elastic film made of a rubber-like elastic body, and the outer peripheral surface of the outer cylindrical metal fitting is inside the first cylindrical portion via the elastic film. You may join to a surrounding surface. In this way, by interposing the elastic film between the outer cylindrical fitting and the first cylindrical portion made of resin, the difference in expansion coefficient between the resin and the metal is absorbed, and the outer cylindrical fitting and the first cylindrical portion are The bonding strength between the two can be increased.

  In this way, when the outer peripheral surface of the outer cylinder fitting is covered with the elastic film, the outer circumference of the protruding portion at both axial ends of the outer cylinder fitting may be covered with the elastic film. In this case, by pressing the mold surface of the injection mold against the outer peripheral surface of the protruding portion through an elastic film, the first material is sealed between the protruding portion and the mold surface while sealing the resin material over the entire circumference. The cylindrical part can be injection molded.

  In the above-described anti-vibration connecting rod, the first anti-vibration base includes the first inner base on both sides of the first inner cylindrical metal fitting in a direction perpendicular to the opposing direction of the first cylindrical portion and the second cylindrical portion. It has a pair of elastic connecting portions that connect and support between the cylindrical metal fitting and the outer cylindrical metal fitting, and the outer cylindrical metal fitting is more in the direction perpendicular to the opposing direction than in the opposing direction. May have a cylindrical shape with a large non-circular cross section.

  Thus, when the outer cylinder fitting has a cylindrical shape with a non-circular cross section, the outer cylinder fitting coupled and held in the first cylindrical portion can be prevented from rotating in the circumferential direction, and durability can be improved. That is, when the outer cylinder fitting is a simple circular cylinder, when an excessive load is applied and a rotational force is applied to the outer cylinder fitting, the bonding between the outer cylinder fitting and the first cylindrical portion is performed. Although there is a possibility of breaking, this can be solved by making the cross section non-circular. In addition, since the outer metal fitting is set to have a large difference in the direction perpendicular to the opposing direction in which the elastic coupling portion of the first vibration isolating base is provided, the length of the elastic coupling portion is increased. The durability of the vibration-proof substrate can also be improved. Therefore, the durability of the first vibration-proof substrate can be improved while providing the rotation prevention function by the shape of the outer cylindrical fitting.

  The outer cylinder fitting may be bent and formed in a diameter-enlarged cylinder part or a diameter-reduced cylinder part in which both end parts in the axial direction are expanded or reduced in diameter than the central part in the axial direction via a stepped part. In this way, by providing the enlarged diameter cylindrical portion or the reduced diameter cylindrical portion via the stepped portions at both ends of the outer cylindrical fitting, it is possible to prevent the outer cylindrical fitting from coming off from the first cylindrical portion in the axial direction. At the same time, the strength of the outer tube fitting itself can be increased.

  According to the present invention, while being an anti-vibration connecting rod of an orthogonal type, the degree of freedom of the configuration of the second anti-vibration bush is provided, and the sealing performance of the resin material during the injection molding of the rod body is ensured. The mold structure of the injection mold can be simplified.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show a torque rod (upper torque rod) 10 which is a vibration-proof connecting rod according to an embodiment. The torque rod 10 is assembled between the body of an automobile and an engine that is a vibration generation source, and suppresses movement and vibration in the roll direction of the engine.

  The torque rod 10 is provided in the first cylindrical portion 12 with a rod body 16 provided with a first cylindrical portion 12 having a large diameter and a second cylindrical portion 14 having a small diameter at both ends in the longitudinal direction L. The first vibration isolating bush 18 and the second vibration isolating bush 20 provided in the second cylindrical portion 14.

  The rod main body 16 includes the first cylindrical portion 12, the second cylindrical portion 14, and a main body connecting portion 22 that extends in the longitudinal direction L that connects both the cylindrical portions 12 and 14, which are made of polyamide or the like. It is integrally formed of a thermoplastic resin material. The first cylindrical portion 12 and the second cylindrical portion 14 are provided with their axes O1 (see FIG. 5) and O2 (see FIG. 4) perpendicular to the longitudinal direction L of the rod body 16, and the first cylindrical portion. The axis O1 of the part 12 and the axis O2 of the second cylindrical part 14 are also provided vertically. Therefore, the torque rod 10 is an orthogonal type connecting rod in which the first anti-vibration bush 18 and the second anti-vibration bush 20 are oriented in a direction perpendicular to each other.

  The main body connecting portion 22 is provided with a plurality of (here, three) reinforcing ribs 24 extending in the longitudinal direction L. These reinforcing ribs 24 extend from the main body connecting portion 22 toward the first cylindrical portion 12, and are provided over the entire circumference on the outer peripheral surface of the first cylindrical portion 12. Reference numeral 26 denotes an injection gate serving as a molten resin injection port when the rod body 16 is injection-molded.

  The first anti-vibration bush 18 provided in the first cylindrical portion 12 includes a first inner cylindrical fitting 28 arranged in parallel in the first cylindrical portion 12 and an axial parallel of the first inner cylindrical fitting 28. And a first anti-vibration base 32 made of a rubber elastic body interposed between the first inner cylinder fitting 28 and the outer cylinder fitting 30 to connect them.

  Further, the second vibration isolating bush 20 provided in the second cylindrical portion 14 having a smaller diameter than the first cylindrical portion 12 is a second inner cylindrical metal fitting 34 disposed in the second cylindrical portion 14 in an axially parallel manner. And a second anti-vibration base 36 made of a rubber elastic body interposed between the second inner cylindrical fitting 34 and the second cylindrical portion 14.

  The second cylindrical portion 14 has a circular cross section, and a second inner cylindrical fitting 34 is provided on the axis O2. The second vibration isolation base 36 is a cylindrical rubber member provided over the entire circumference between the second inner cylindrical fitting 34 and the second cylindrical portion 14, and is vulcanized and bonded to the outer peripheral surface of the second inner cylindrical fitting 34. Are integrally provided. Then, the second vibration isolating bush 20 having the second vibration isolating base 36 vulcanized and formed on the outer periphery of the second inner cylindrical metal fitting 34 is press-fitted in the axial direction with respect to the second cylindrical portion 14 of the rod body 16. It is installed by.

  On the other hand, the first vibration isolating bush 18 is coupled and held in the first cylindrical portion 12 by injection molding of the rod body 16. That is, after the first vibration-proof base 32 is vulcanized and molded between the first inner cylinder fitting 28 and the outer cylinder fitting 30, the vulcanized molded body is set in an injection mold, and the resin material is injected from the injection gate 26. By injection molding, the rod body 16 is formed integrally with the first vibration isolating bush 18, and thereby, the outer cylinder fitting 30 is configured to be coupled and held in the first cylindrical portion 12. Details of the injection mold and the injection molding method will be described later.

  As shown in FIG. 2, the outer cylindrical fitting 30 of the first vibration isolating bush 18 is different in the opposing direction of the first cylindrical portion 12 and the second cylindrical portion 14 (that is, the longitudinal direction L of the main body connecting portion 22). The cross section D2 in the direction M perpendicular to the longitudinal direction L is larger than the cross section D1, and has a cylindrical shape with a non-circular cross section. In this example, the cross section (that is, the diameter) D1 in the longitudinal direction L is smaller than the cross section (that is, the diameter) D2 in the direction M perpendicular to the longitudinal direction. The oval shape may be a track shape composed of two opposing semicircular portions and a pair of linear portions connecting between the two semicircular portions as shown in FIG. 6, or may be an elliptical shape.

  Further, as shown in FIGS. 7 and 8, the outer tube fitting 30 has an enlarged cylindrical portion 38 in which both axial end portions 30A and 30A are larger in diameter than the axial central portion 30C via stepped portions 30B and 30B. , 38 are bent. The enlarged diameter cylindrical portion 38 is formed over the entire circumference at both axial end portions 30 </ b> A and 30 </ b> A of the outer cylindrical fitting 30. As a result, the outer tubular fitting 30 is formed in a concave shape in which the axial central portion 30C is recessed inward in the direction perpendicular to the axis in the cross-sectional shape along the axial direction X1.

  A rectangular opening window 40 penetrating the inside and the outside is provided on the side wall on the main body connecting portion 22 side in the axial center portion 30C of the outer tube fitting 30 (see FIGS. 5, 7, and 8). As a result, an outer peripheral surface 30 </ b> D of the outer cylinder fitting 30 is covered with an elastic film 42 made of a rubber elastic body that is continuous with the first vibration isolation base 32. As shown in FIGS. 4 and 7, the elastic film 42 is formed on the outer peripheral surface 30 </ b> D of the outer tube fitting 30 with the axial center portion 30 </ b> C, the step portions 30 </ b> B and 30 </ b> B on both sides thereof, and the outer diameter-enlarged tube portions 38 and 38. It is formed over substantially the whole of the axial direction X1 including a part thereof and in the circumferential direction over the entire circumference. By providing the elastic film 42 in this way, as shown in FIGS. 4 and 5, the outer cylindrical member 30 has its outer peripheral surface 30 </ b> D joined to the inner peripheral surface of the first cylindrical portion 12 via the elastic film 42. Has been.

  As shown in FIGS. 1 and 5, the outer cylindrical fitting 30 has both axial end portions 30 </ b> A and 30 </ b> A all around the axially opposite end surfaces 12 </ b> A and 12 </ b> A of the first cylindrical portion 12. The protrusion part 43 is formed by protruding over. The protruding portion 43 is a portion that forms the tip of each of the axial end portions 30A, 30A, and its outer peripheral surface 43A is exposed without being covered with the elastic film 42, and is made of resin that covers the elastic film 42 The first cylindrical portion 12 is provided so as to protrude in the axial direction X1 so as to be exposed.

  As shown in FIG. 2, the first anti-vibration base 32 of the first anti-vibration bush 18 has a first inner cylinder fitting 28 on both sides of the first inner cylinder fitting 28 in the direction M perpendicular to the longitudinal direction L. And a pair of upper and lower elastic connecting portions 44, 44 that connect and support the outer cylindrical fitting 30. Specifically, as shown in FIGS. 6 and 7, the first vibration isolation base 32 includes a pair of hollow portions 46 that penetrate in the axial direction X1 on both sides of the first inner cylindrical fitting 28 in the longitudinal direction L. 46, whereby a pair of upper and lower elastic connecting portions 44, 44 connecting the pair of upper and lower side surfaces of the first inner cylinder fitting 28 and the upper and lower inner peripheral surfaces of the outer cylinder fitting 30 opposed thereto are provided. Is provided. Accordingly, the elastic connecting portion 44 connects the first inner cylinder fitting 28 and the outer cylinder fitting 30 on the larger delivery D2 side of the outer cylinder fitting 30.

  The pair of hollow portions 46, 46 are provided with stopper rubber portions 48, 50, respectively, and the stopper rubber portion 48 on the main body connecting portion 22 side has two straight portions 52 in the axial direction X1 having a circular cross section. One is provided.

  In manufacturing the torque rod 10 having the above-described configuration, first, the first vibration isolating bush 18 shown in FIGS. 6 and 7 is vulcanized and molded, and then the first vibration isolating bush 18 is set in the injection mold 60. Then, the rod body 16 is formed by injecting a resin material. 9 to 13 show the injection mold 60.

  The injection mold 60 is a mold that is divided into two with the mold dividing direction as the axial direction X2 of the second cylindrical portion 14, and includes a first mold 62 and a second mold 64. By setting the axial direction X2 of the second cylindrical portion 14 as the dividing direction, the cores 62A and 64A for forming the hollow portion of the second cylindrical portion 14 are respectively formed in the first mold 62 and the second mold 64. The first mold 62 and the second mold 64 are provided with grooves 62B and 64B for forming the reinforcing ribs 24 on the upper and lower surfaces of the main body connecting portion 22 and the outer peripheral surface of the first cylindrical portion 12. It has been.

  By setting the mold dividing direction to the axial direction X2 of the second cylindrical portion 14, the first cylindrical portion 12 provided with the first vibration isolating bush 18 has a direction (axial orthogonal direction) Y1 (a direction perpendicular to the axis) Y1 ( The same as the direction M perpendicular to the longitudinal direction L) is the dividing direction. That is, the first molding portion 66 of the injection mold 60 that molds the first cylindrical portion 12 is divided in the direction perpendicular to the axis Y1. Therefore, in the first molded portion 66, a seal structure is configured as follows in order to prevent the resin material from entering the inside of the first vibration isolating bush 18.

  That is, the protruding portions 43 and 43 at the axial end portions 30A and 30A of the outer cylindrical metal fitting 30 are shown in FIGS. 9A, 12 and 13 as a sealing portion of the resin material when the rod body 16 is injection molded. In this way, the mold surface 68 of the first molding portion 66 is pressed against the outer peripheral surface 43A of the protruding portion 43, and the resin material is sealed between the outer peripheral surface 43A and the mold surface 68 over the entire circumference.

  As shown in FIG. 13, the mold surface 68 of the first molding portion 66 pressed against the outer peripheral surface 43 </ b> A of the protruding portion 43 is the axial direction of the first molding portion 66 that molds the axial end surface 12 </ b> A of the first cylindrical portion 12. A step is provided at the end of X 1, and the inner peripheral surface of the step 70 is the mold surface 68. As shown in FIG. 12, the mold surface 68 is provided in each of the first mold 62 and the second mold 64, and is formed into an oval annular shape that surrounds the protruding portion 43 over the entire circumference by combining both.

  Using the above-described injection mold 60, the anti-vibration bush 18 is set in the first molding portion 66 of the injection mold 60 as shown in FIGS. 9A, 10A, and 11-13. To do. The anti-vibration bushing 18 is held in a state where the outer cylinder fitting 30 is sandwiched in the direction perpendicular to the axis Y1 at both end portions 30A and 30A by closing the first mold 62 and the second mold 64, and in this state, The mold surface 68 of the first molding portion 66 is pressed against the protruding portion 43 of the both end portions 30A to seal the entire circumference. Thereafter, by injecting the resin material from the injection gate 26 into the injection mold 60, the rod body 16 is injection-molded as shown in FIG. 9B and FIG. Divide the mold and remove the molded product. Then, the torque rod 10 shown in FIGS. 1-5 is obtained by press-fitting the second vibration isolating bush 20 separately vulcanized into the second cylindrical portion 14.

  In the torque rod 10 constructed as described above, the first inner cylinder fitting 28 is connected to either the vehicle body or the engine, and the second inner cylinder fitting 34 is connected to either the vehicle body or the engine. Specifically, in this example, the longitudinal direction L is the front-rear direction, and the direction M perpendicular to the longitudinal direction L is the up-down direction, and the first inner cylinder fitting 28 is on the engine side and the second inner cylinder fitting 34 is on the vehicle body side. Combined.

  In the torque rod 10 of this embodiment, the protruding portions 43 are provided at both axial end portions 30 </ b> A of the outer cylinder fitting 30, and the protruding portions 43 are injection molded as resin material seal portions when the rod body 16 is injection molded. The mold surface 68 of the mold 60 is pressed against it. Therefore, the first dividing portion for the first tubular portion 12 divided in the direction perpendicular to the axis Y1 is set while the dividing direction of the injection mold 60 is set to the axial direction X2 of the second tubular portion 14. In the molding part 66, the sealing performance of the resin material can be ensured. In particular, since the resin material is sealed by pressing the mold surface 68 of the injection mold 60 against the protruding portion 43 of the outer cylindrical metal fitting 30 that is a rigid body, excellent sealing performance is ensured without losing the injection pressure of the resin material. be able to. Therefore, while being a torque rod of an orthogonal type, the injection molding die while ensuring the sealing performance of the resin material at the time of injection molding of the rod body 16 while giving the configuration of the second vibration isolating bush 20 flexibility. 60 mold structures can be simplified.

  Further, in the torque rod 10 of the present embodiment, the outer cylinder fitting 30 of the first vibration isolating bush 18 on the large diameter side has a cylindrical shape with an oval cross section, and is thus coupled to the first cylindrical portion 12. The rotation of the held outer cylinder fitting 30 in the circumferential direction can be prevented. Therefore, it is possible to improve the durability by preventing adhesion failure between the outer tubular fitting 30 and the first tubular portion 12.

  In addition, since the outer cylinder fitting 30 has a large difference in the direction M perpendicular to the longitudinal direction L in which the elastic connection portion 44 of the first vibration isolation base 32 is provided (D2> D1), the elastic connection The durability of the first vibration isolation base 32 can be improved by increasing the length of the portion 44. Therefore, the durability of the first anti-vibration base 32 can be improved while the anti-rotation function is provided by the shape of the outer cylinder fitting 30.

  In addition, since the rotation preventing function can be provided with a relatively simple shape of a cylindrical body having an oval cross section, the cost can be reduced. The cross-sectional shape of the outer cylinder fitting 30 is not limited to such an oval shape (track shape, oval shape), and various noncircular shapes such as a rectangular shape with rounded corners are applied. be able to.

  In the torque rod 10 of the present embodiment, since the diameter-expanded cylindrical portions 38, 38 are provided at the axial both ends 30A, 30A of the outer cylindrical fitting 30 via the step portions 30B, 30B, The outer tubular fitting 30 can be prevented from coming off from the first tubular portion 12. Further, by adopting such a bent shape, it is possible to increase the strength of the outer tubular fitting 30, and it is possible to improve durability from this point.

  In the torque rod 10 of the present embodiment, the elastic film 42 is interposed between the outer tubular fitting 30 and the first cylindrical portion 12 made of resin, so that the difference in expansion coefficient between the resin and the metal is reduced. It can be absorbed by the elastic film 42 to increase the bonding strength between the outer tubular fitting 30 and the first cylindrical portion 12, and the durability can be improved also in this respect.

  14 to 16 show other embodiments (however, the illustration of the second vibration-proof bushing is omitted in FIG. 14). In this embodiment, the shape of the outer cylinder fitting 30 and the covering range of the elastic film 42 covering the outer peripheral surface of the outer cylinder fitting 30 are different from those in the above embodiment.

  That is, in this example, the outer cylinder fitting 30 is bent and formed into a reduced diameter cylindrical portion 80 whose one end portion in the axial direction is reduced in diameter than the central portion 30C in the axial direction through the step portion 30B. The other end is bent and formed in a diameter-expanded cylindrical portion 82 whose diameter is larger than that of the central portion 30C in the axial direction through the step portion 30B.

  Further, the protruding portions 43 and 43 at both ends in the axial direction of the outer cylindrical metal fitting 30 are covered with an elastic film 42 on the outer peripheral surface 43A over the entire circumference. Therefore, the elastic film 42 is formed so as to cover the outer peripheral surface of the outer cylindrical fitting 30 over the entire axial direction X1. The protruding portion 43 is provided so as to protrude in the axial direction X1 from the first cylindrical portion 12 made of resin in a state where it is covered with the elastic film 43.

  In this embodiment, the outer peripheral surface 43A of the protruding portion 43 of the outer cylindrical metal fitting 30 is covered with the elastic film 42. Therefore, when the rod body 16 is injection molded, as shown in FIG. The elastic film 42 is interposed between the mold surface 68 of the mold 60. Therefore, the resin material is sealed over the entire circumference between the protruding portion 43 and the mold surface 68 by pressing the mold surface 68 of the injection mold 60 against the outer peripheral surface 43A of the protruding portion 43 via the elastic film 42. can do. That is, although the elastic film 42 is present, the inner side thereof is backed up by the protruding portion 43 of the outer cylindrical metal fitting 30 which is a rigid body, so that sealing performance can be ensured without losing the injection pressure of the resin material. it can. In particular, since the tip of the protruding portion 43 is covered with the axial end surface 72 of the injection mold 60 perpendicular to the mold surface 68, it is pressed radially inward by the injection pressure of the mold surface 68 and the resin material. It is possible to prevent the end of the elastic film 42 in the axial direction from escaping inward beyond the tip of the protruding portion 43, and thus exhibiting excellent sealing performance.

  In addition, since the outer cylinder fitting 30 is formed with the reduced diameter cylindrical portion 80 at one end and the enlarged diameter cylindrical portion 82 at the other end, the expanded cylindrical portion 38 is provided at both ends. Compared to the case, it is easier to form the outer cylinder fitting 30 by drawing. Of course, as with the above embodiment, it is possible to prevent the outer tube fitting from coming off and to increase the strength. Instead of providing the enlarged diameter cylindrical portion 38 at both ends or combining the reduced diameter cylindrical portion 80 and the enlarged diameter cylindrical portion 82 as in the above embodiment, a stepped portion is provided at both axial ends of the outer cylinder fitting. A diameter-reduced cylindrical portion having a diameter smaller than that of the central portion in the axial direction may be bent and formed. Thereby, the outer cylinder fitting is formed in a convex shape in which the central portion in the axial direction swells outward in the direction perpendicular to the axis in the cross-sectional shape along the axial direction. As described above, even when the reduced-diameter cylindrical portions are provided at both ends, it is possible to prevent the outer tube fitting from coming off and increase the strength.

  In the embodiment shown in FIGS. 14 to 16, other configurations and operational effects are basically the same as those of the above-described embodiment shown in FIGS. 1 to 13, and the same operational effects are achieved.

  In the above-described embodiment, the configuration in which the outer cylindrical metal fitting 30 is provided only in the first vibration isolating bush 18 provided in the first cylindrical portion 12 is employed, but the second cylindrical portion 14 on the small diameter side is provided. The second vibration isolating bush 20 may be provided with an outer cylinder fitting. Furthermore, the second vibration isolating bush 20 may be vulcanized and molded in advance, and the rod body 16 may be injection molded by setting the second vibration isolating bush 20 in the injection mold 60.

  In addition to the torque rod, the present invention can be applied as various anti-vibration connecting rods such as a stabilizer link rod and a suspension rod. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

The perspective view of the vibration isolating connecting rod which concerns on one Embodiment of this invention. Side view of the anti-vibration connecting rod Plan view of the anti-vibration connecting rod Sectional view taken along line IV-IV in FIG. VV sectional view of FIG. Side view of the first anti-vibration bush of the anti-vibration connecting rod VII-VII line sectional view of FIG. Perspective view of the outer cylinder fitting of the first anti-vibration bush (A) Cross-sectional view of injection mold for vibration-proof connecting rod (cross-sectional view corresponding to IX-IX in FIG. 10), (b) Cross-sectional view after injection (A) XX sectional view of FIG. 9, (b) sectional view after injection XI-XI line sectional view of FIG. XII-XII sectional view of FIG. XIII-XIII line sectional view of FIG. Cross-sectional view of a vibration-isolating connecting rod according to another embodiment Sectional view of the first anti-vibration bush of the anti-vibration connecting rod An enlarged cross-sectional view of the main part during injection molding of the anti-vibration connecting rod

Explanation of symbols

10 ... Torque rod (anti-vibration connecting rod)
DESCRIPTION OF SYMBOLS 12 ... 1st cylindrical part, 12A ... Axial direction end surface 14 ... 2nd cylindrical part 16 ... Rod main body 18 ... 1st anti-vibration bush 20 ... 2nd anti-vibration bush 28 ... 1st inner cylinder metal fitting 30 ... Outer cylinder metal fitting , 30A ... axial end, 30B ... stepped portion, 30C ... axial central portion, 30D ... outer peripheral surface 32 ... first vibration isolating base 34 ... second inner cylinder fitting 36 ... second anti-vibration base 38 ... diameter-expanded cylinder Part 42 ... Elastic film 43 ... Projection part, 43A ... Outer peripheral surface 60 ... Injection mold 68 ... Mold surface 80 ... Reduced diameter cylindrical part 82 ... Increased diameter cylindrical part L ... Longitudinal direction (first and second cylindrical parts) Facing direction)
M ... direction perpendicular to the longitudinal direction (opposite direction) D1 ... difference in the longitudinal direction of the outer cylinder fitting D2 ... difference in the direction perpendicular to the longitudinal direction of the outer cylinder fitting X1 ... axial direction of the first cylindrical portion

Claims (7)

A rod body made of a resin material having a first tubular portion at one end and a second tubular portion at the other end;
A first vibration isolating bush provided in the first tubular portion;
A second anti-vibration bush provided in the second tubular portion;
An anti-vibration connecting rod in which the first anti-vibration bush and the second anti-vibration bush are oriented in a direction perpendicular to each other;
The first anti-vibration bush includes a first inner cylinder fitting that is arranged in parallel to the first cylindrical portion, an outer cylinder fitting that surrounds the first inner cylinder fitting, and the first inner fitting. And a first anti-vibration base made of a rubber-like elastic body that is interposed between the outer cylindrical fittings and connects the two,
The outer cylinder fitting is joined and held in the first cylindrical portion by injection molding of the rod body, and both axial ends of the outer cylinder fitting are axially outward from the axial end face of the first cylindrical portion. An anti-vibration connecting rod characterized by being protruded on the side.   The protruding portions at both axial end portions of the outer cylinder fitting are used as sealing portions for the resin material at the time of injection molding of the rod body, and the mold surface of the injection mold is pressed against the outer peripheral surface of the protruding portion. The vibration-isolating connecting rod according to claim 1, wherein the first cylindrical portion is injection-molded while sealing a resin material over the entire circumference with the mold surface.   The second anti-vibration bush includes a second inner cylinder fitting disposed axially parallel to the second cylindrical portion, and a rubber-like elastic body integrally provided on the outer peripheral surface of the second inner cylinder fitting. The anti-vibration connecting rod according to claim 1 or 2, further comprising: 2 anti-vibration bases, wherein the anti-vibration connecting rod is mounted by being press-fitted into the second cylindrical portion after injection molding of the rod body.   The outer peripheral surface of the outer tubular metal fitting is covered with an elastic film made of a rubber-like elastic body, and the outer peripheral surface of the outer cylindrical metal fitting is joined to the inner peripheral surface of the first cylindrical portion via the elastic film. The vibration-isolating connecting rod according to any one of 1 to 3.   The outer peripheral surface of the protruding portion at both axial ends of the outer cylinder fitting is covered with the elastic film, and the mold surface of the injection mold is pressed against the outer peripheral surface of the protruding portion via the elastic film. The vibration-isolating connecting rod according to claim 4, wherein the first cylindrical portion is injection-molded while sealing the resin material over the entire circumference between the protruding portion and the mold surface. The first anti-vibration base includes the first inner cylindrical bracket and the outer cylindrical bracket on both sides of the first inner cylindrical bracket in a direction perpendicular to the opposing direction of the first cylindrical portion and the second cylindrical portion. It has a pair of elastic connecting parts that connect and support between,
The said outer cylinder metal fitting makes | forms the cylinder shape of a non-circular cross section in which the difference in the direction perpendicular | vertical to this opposing direction is larger than the difference in the said opposing direction. The anti-vibration connecting rod according to Item.   The outer cylinder fitting is formed by bending a diameter-enlarged cylinder part or a diameter-reduced cylinder part in which both end parts in the axial direction are expanded or reduced in diameter from the central part in the axial direction through a stepped part. The vibration-isolating connecting rod according to any one of the above.

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