JP2009115109A - Vibration isolating connecting rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration isolating connecting rod having excellent strength and durability while reducing weight. <P>SOLUTION: This vibration isolating connecting rod 10 includes: a rod body 16 composed of a first cylindrical part and a second cylindrical part 14 which are provided at both ends in a longitudinal direction and a body connecting part 22 connecting both the cylindrical parts, and integrally molded by resin material; a first vibration isolating bush 18 arranged inside of the first cylindrical part; and a second vibration isolating bush 20 arranged inside of the second cylindrical part. A plurality of hole parts 42 sunk in an axial direction X is formed side by side in a peripheral direction C in the peripheral part 12A of the first cylindrical part on the side opposite to the body connecting part. By forming the plurality of hole parts 42, the peripheral part 12A of the first cylindrical part is composed of an inner sidewall 44 on an inner peripheral side, an outer sidewall 46 on an outer peripheral side, and a plurality of support walls 48 connecting the inner sidewall and the outer sidewall between the adjacent hole parts. <P>COPYRIGHT: (C)2009,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 rod body having a cylindrical portion at both ends in the longitudinal direction, and a pair of anti-vibration bushes provided in each cylindrical portion of the rod body with an inner cylinder and a rubber-like elastic portion. And is attached to the engine or the vehicle body using the inner cylinder as an attachment member.

In recent years, there is a strong demand for weight reduction of automobiles, and it has been proposed that the rod body is formed of a resin material as a means for reducing the weight (see Patent Documents 1 to 3 below).
JP 7-35127 A JP-A-7-197927 JP 2005-265123 A

  The resin-made vibration-proof connecting rod as described above is generally difficult to ensure strength and durability as compared with a metal-made anti-vibration connecting rod. In particular, it is necessary to secure sufficient strength in the large-diameter cylindrical portion provided with the large-diameter anti-vibration bush among the pair of anti-vibration bushes.

  Therefore, in order to ensure the strength, it is conceivable to increase the thickness of the peripheral wall of the cylindrical portion. However, if the thickness is increased in this way, the inside of the thick cylindrical portion is caused by shrinkage during molding with a resin material. There is a possibility that voids are generated in the steel, and the strength and durability are impaired. On the other hand, it is difficult to sufficiently secure the strength required for a torque rod of an automobile simply by providing a hole in a thick-walled cylindrical portion and suppressing the generation of voids.

  This invention is made | formed in view of the above point, and it aims at providing the anti-vibration coupling rod excellent in intensity | strength and durability, and attaining weight reduction.

  The anti-vibration connecting rod according to the present invention includes a first tubular portion provided at one end portion in the longitudinal direction, a second tubular portion provided at the other end portion in the longitudinal direction, and the first tubular portion. A rod body integrally formed of a resin material, a first inner cylinder, and a first rubber-like elastic part. The rod body is provided in the first cylinder part. A first anti-vibration bush, a second inner cylinder and a second anti-vibration bush provided in the second cylindrical part with a second rubber-like elastic part, and the first cylindrical part A plurality of holes recessed in the axial direction of the first tubular portion are provided side by side in the circumferential direction on the opposite side of the main body connecting portion in the first cylindrical portion, The circumferential portion of the cylindrical portion includes an inner wall portion on the inner circumferential side, an outer wall portion on the outer circumferential side, and the inner wall portion and the outer portion between the adjacent hole portions. Those comprised of a plurality of support walls connecting the wall.

  As described above, a plurality of holes are arranged in the circumferential portion on the opposite side to the main body connecting portion in the first tubular portion, and the circumferential portion is divided into an inner wall portion on the inner circumferential side and an outer wall on the outer circumferential side. Because it is composed of a part and a plurality of support wall parts that connect both wall parts, it is possible to sufficiently ensure the strength required as a torque rod for automobiles while suppressing the generation of voids due to shrinkage during molding of the resin material Can do. Therefore, it is possible to provide a vibration-isolating connecting rod that is excellent in strength and durability while achieving weight reduction.

  In such an anti-vibration connecting rod, a central support wall portion in the circumferential direction among the plurality of support wall portions is disposed at a circumferential position farthest from the main body connection portion in the first tubular portion. If the plurality of holes are provided, the strength of the first cylindrical portion can be further increased.

  Further, the plurality of hole portions include a pair of first hole portions provided with the central support wall portion interposed therebetween, and a pair of the support wall portions interposed on both sides in the circumferential direction of the pair of first hole portions. You may be comprised by four hole parts with a provided 2nd hole part. Thereby, it is possible to achieve both excellent moldability and strength.

  In addition, when the plurality of support wall portions are provided radially around the axis of the first cylindrical portion, the strength of the first cylindrical portion can be further increased.

  In addition, the plurality of holes are recessed from both one side and the other side in the axial direction in the circumferential portion of the first cylindrical part, and the inner side wall and the outer side wall are centered in the axial direction. If the portion is connected by the wall connecting portion, the strength of the first tubular portion can be further increased.

  According to the present invention, it is possible to improve the strength and durability of the vibration-isolating connecting rod while reducing the weight.

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

  1 to 7 show a torque rod 10 that is a vibration-proof connecting rod according to the 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 resin material. The first cylindrical portion 12 and the second cylindrical portion 14 are cylindrical portions provided such that both axes O1 and O2 are parallel to each other and perpendicular to the longitudinal direction L of the rod body 16, and the first cylinder The shape portion 12 is formed with a larger diameter.

  The main body connecting portion 22 has a width direction M as a direction perpendicular to the longitudinal direction L and the axial direction X of the first and second cylindrical portions 12 and 14, and has the same outer shape as the first cylindrical portion 12 at one end. It has a width dimension and is formed in a wide shape having the same width dimension as the outer shape of the second cylindrical portion 14 at the other end. And it has the ribs 24 and 26 extended in the longitudinal direction L in each of the both ends and center part of this width direction M, and has the thin part 28 between these ribs 24 and 26. As shown in FIG. As shown in FIG. 5, the thin portion 28 is provided so as to be biased to one side in the axial direction X. As a result, when the vehicle is mounted (mounted on the vehicle so that the upper side in FIG. 5 is directed downward), the body connecting portion 22 having a concave cross section is opened downward so that water does not collect in the concave portion. It is configured.

  The first vibration isolating bush 18 is provided between the first inner cylinder 30 and the first inner cylinder 30 which are arranged in parallel and coaxially in the first cylindrical portion 12, and between the first inner cylinder 30 and the first cylindrical portion 12. And a first rubber-like elastic portion 32 made of a rubber elastic body. The first inner cylinder 30 is a rigid member connected to either the vehicle body or the engine, for example, the vehicle body side.

  In this example, the first rubber-like elastic portion 32 is bonded and fixed to the outer peripheral surface of the first inner cylinder 30 and the inner peripheral surface of the first cylindrical portion 12, and the first inner cylinder in the longitudinal direction L is fixed. A pair of straight portions 34, 34 penetrating in the axial direction X are provided on both sides of the side 30, and a stopper rubber portion 36 is provided on each straight portion 34.

  The second anti-vibration bush 20 is provided between the second inner cylinder 38 and the second cylindrical section 14 which are arranged in parallel and coaxially in the second cylindrical section 14. And a second rubber-like elastic portion 40 made of a rubber elastic body. The second inner cylinder 38 is a rigid member connected to one of the engines of the vehicle body, for example, the engine side.

  In this example, the second rubber-like elastic portion 40 is adhesively fixed to the outer peripheral surface of the second inner cylinder 38 and the inner peripheral surface of the second cylindrical portion 14, and a cylinder that connects the two over the entire circumference. It is formed in a shape. That is, the rubber portion does not have a straight portion penetrating in the axial direction X.

  In the above-described configuration, the circumferential portion of the first cylindrical portion 12 on the large diameter side opposite to the main body connecting portion 22 (that is, the main body connecting portion 22 is connected to the end portion side of the rod main body 16). A plurality of holes 42 that are recessed in the axial direction X of the first cylindrical portion 12 are provided side by side in the circumferential direction C. Specifically, the circumferential portion 12A has a thicker peripheral wall than the side to which the main body connecting portion 22 is connected, and the plurality of hole portions 42 are recessed in the thick peripheral wall portion. Has been. The hole 42 is formed in a quadrangular shape with rounded corners in the plan view shown in FIG. By providing the plurality of hole portions 42 in this way, the circumferential portion 12A of the first tubular portion 12 has an inner wall portion 44 that has an arc shape in plan view on the inner peripheral side of the plurality of hole portions 42. A plurality of supports for connecting and supporting the inner wall portion 44 and the outer wall portion 46 between the adjacent hole portions 42 and 42, and the outer wall portion 46 having a circular arc shape in plan view on the outer peripheral side of the plurality of hole portions 42. It is comprised with the wall part 48. FIG.

  In this example, the plurality of hole portions 42 includes four hole portions. Accordingly, three support wall portions 48 defined between the adjacent hole portions 42 and 42 are provided. As shown in FIG. 2, the plurality of hole portions 42 are circumferential positions farthest from the main body connecting portion 22 in the first tubular portion 12, specifically, the first tubular portion in the circumferential portion 12 </ b> A. The center support wall 48A in the circumferential direction C among the three support walls is arranged at a position on the center line N that connects the centers of the 12 and the second cylindrical portion 14 (the axes O1 and O2). Is set to

  The plurality of hole portions 42 are provided symmetrically with respect to the center line N, and a pair of first hole portions 42A and 42A provided with the center support wall portion 48A interposed therebetween, and the pair of first holes 42A and 42A. It is constituted by a pair of second hole portions 42B and 42B provided on both sides in the circumferential direction C of the one hole portions 42A and 42A with the support wall portions 48B and 48B interposed therebetween. And these three support wall part 48A, 48B, 48B is formed so that it may extend radially centering on the axis | shaft O1 of the 1st cylindrical part 12, as shown in FIG.

  In this example, as shown in FIG. 2, the thick circumferential portion 12 </ b> A is limited to the end side of the rod body 16 with respect to the axis O <b> 1 of the first cylindrical portion 12. Both end portions are formed in a thin shape with respect to the central portion in the circumferential direction on the center line N. On the other hand, the thickness of the inner wall portion 44 and the outer wall portion 46 is set to be constant in the circumferential direction C, so that the hole portion 42 is closer to the end than the first hole portions 42A, 42A closer to the center. The two holes 42B and 42B are set to have smaller dimensions in the direction perpendicular to the axis.

  As shown in FIG. 6, the plurality of hole portions 42 are recessed from both the one surface 12A1 and the other surface 12A2 in the axial direction X in the circumferential portion 12A of the first cylindrical portion 12, and the inner wall The portion 44 and the outer wall portion 46 are connected by a wall connecting portion 50 at the central portion in the axial direction X.

  As shown in FIGS. 1, 4, and 7, two outer peripheral ribs 52, 52 extending along the longitudinal direction L are provided on the outer peripheral side surface of the rod body 16 at intervals in the axial direction X. . As shown in FIGS. 3 and 7, the outer peripheral surface of the second cylindrical portion 14 on the small diameter side is provided with a longitudinal rib 54 extending in the axial direction X connecting the two outer peripheral ribs 52, 52. The strength is increased.

  The torque rod 10 having the above configuration is manufactured as follows. That is, first, the first rubber-like elastic portion 32 is vulcanized and formed on the outer peripheral surface of the first inner cylinder 30, and the second rubber-like elastic portion 40 is vulcanized and formed on the outer peripheral surface of the second inner cylinder 38. Next, after applying an adhesive to the outer peripheral surfaces of the first rubber-like elastic portion 32 and the second rubber-like elastic portion 40, these vulcanized molded bodies are set in an injection mold, and a resin material is injected. By injecting through the hole 56 (see FIGS. 1 and 4), the rod body 16 is integrally injection-molded.

  In the torque rod 10 of the present embodiment, a plurality of holes 42 are arranged in parallel with the circumferential portion 12A on the end portion side of the first cylindrical portion 12 on the large diameter side, and the circumferential portion 12A is connected to the inner wall. Since it comprised with the part 44, the outer side wall part 46, and the some support wall part 48, the outstanding intensity | strength and durability can be ensured, suppressing generation | occurrence | production of the void by shrinkage | contraction at the time of shaping | molding of a resin material.

  In addition, since the hole 42 is not provided on the center line N and the central support wall 48A is disposed in this portion, the strength of the first cylindrical portion 12 can be further increased. In addition, since the plurality of support wall portions 48 are provided radially with the first cylindrical portion 12 as the center, the input of the first vibration isolating bush 18 due to relative displacement in the direction perpendicular to the axis of the first inner cylinder 30 is prevented. Thus, the strength of the first cylindrical portion 12 can be effectively increased. Further, since the inner wall portion 44 and the outer wall portion 46 are connected by the wall connecting portion 50 at the central portion in the axial direction X, the strength of the first tubular portion 12 can be improved. Further, since the plurality of hole portions 42 have the four-hole configuration as described above, an effective increase in strength can be achieved without impairing the flow of the resin material at the time of injection molding.

  FIG. 8 shows a torque rod 10A according to another embodiment. This example is characterized in that a surplus portion 60 is provided at a place where a weld is generated during resin molding. When a resin material is injection-molded from the injection hole 56, a weld may be generated at the circumferential position where the central support wall portion 48A is provided, thereby impairing strength and durability. Therefore, a surplus portion 60 protruding in the longitudinal direction L is set in this portion.

  The surplus portion 60 has a surplus portion main body 62 wider than the central support wall portion 48A, and protrudes in the longitudinal direction L with substantially the same width as the support wall portion 48A. It consists of a surplus connection part 64 that connects the outer peripheral surface of the part 12. Further, the surplus portion 60 is provided over the entire axial direction X of the first tubular portion 12.

  By providing such a surplus portion 60, welds are generated in the surplus portion 60. Therefore, by cutting off the surplus portion 60 after injection molding, the strength and durability of the rod body 16 are improved. In addition, quality can be stabilized. Moreover, since the surplus portion 60 is cut out after molding, the product outer shape does not increase. Other configurations are the same as those of the previous embodiment, and the same operational effects are achieved.

  In the above embodiment, the hole portion 42 is provided only in the first cylindrical portion 12, but the same configuration can also be adopted in the second cylindrical portion 14. Further, both the first vibration isolating bush 18 and the second vibration isolating bush 20 are configured to be integrally bonded to the rod main body 16 at the time of injection molding of the rod main body 16. The first anti-vibration bush 18 and the second anti-vibration bush 20 may be press-fitted and held. Furthermore, both the first vibration isolating bush 18 and the second anti-vibration bush 20 have a configuration without a rigid outer cylinder, but the outer cylinder is preliminarily molded on the outer periphery of the rubber-like elastic portion, You may comprise so that an outer cylinder may be press-fitted and hold | maintained at the 1st cylindrical part 12 or the 2nd cylindrical part 14. FIG. Further, in addition to the torque rod, it 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 embodiment Plan view of the anti-vibration connecting rod Bottom view of the anti-vibration connecting rod Side view of the anti-vibration connecting rod VV sectional view of FIG. Sectional view taken along line VI-VI in FIG. Side view seen from VII direction in FIG. Plan view of anti-vibration connecting rod according to another embodiment

Explanation of symbols

10, 10A ... Torque rod (anti-vibration connecting rod)
DESCRIPTION OF SYMBOLS 12 ... 1st cylindrical part, 12A ... Circumferential part, 12A1 ... One side, 12A2 ... The other side 14 ... 2nd cylindrical part 16 ... Rod main body 18 ... 1st anti-vibration bush 20 ... 2nd anti-vibration bush 22 ... Main body connecting part 30 ... first inner cylinder, 32 ... first rubber-like elastic part 38 ... second inner cylinder, 40 ... second rubber-like elastic part 42 ... hole, 42A ... first hole, 42B ... second hole Part 44 ... inner wall part, 46 ... outer wall part 48 ... support wall part, 48A ... center support wall part, 48B ... a pair of support wall parts 50 on both sides ... wall connecting part C ... circumferential direction, L ... longitudinal direction, O1 ... axis of the first cylindrical part, X ... axial direction

Claims (5)

A first cylindrical part provided at one end in the longitudinal direction, a second cylindrical part provided at the other end in the longitudinal direction, and a main body connection for connecting the first cylindrical part and the second cylindrical part. A rod body formed integrally with a resin material,
A first anti-vibration bushing provided in the first cylindrical part with a first inner cylinder and a first rubber-like elastic part;
A second vibration isolating bush provided in the second cylindrical portion with a second inner cylinder and a second rubber-like elastic portion;
With
A plurality of holes recessed in the axial direction of the first cylindrical portion are provided side by side in the circumferential direction on the side of the first cylindrical portion opposite to the main body connecting portion, and the plurality of holes The circumferential portion of the first tubular portion is formed between the inner wall portion on the inner peripheral side, the outer wall portion on the outer peripheral side, and the inner wall portion and the outer wall between the adjacent hole portions. Consists of a plurality of support walls connecting the parts,
Anti-vibration connecting rod   The plurality of hole portions are arranged such that a central support wall portion in the circumferential direction among the plurality of support wall portions is disposed at a circumferential position farthest from the main body connecting portion in the first tubular portion. The anti-vibration connecting rod according to claim 1 provided.   The plurality of hole portions are provided with a pair of first hole portions sandwiched between the central support wall portions and a pair of the support wall portions on both sides in the circumferential direction of the pair of first hole portions. The anti-vibration connecting rod according to claim 2, wherein the anti-vibration connecting rod is composed of four holes, a pair of second holes.   The anti-vibration connecting rod according to any one of claims 1 to 3, wherein the plurality of support wall portions are provided radially about an axis of the first cylindrical portion.   The plurality of hole portions are recessed from both one side and the other side in the axial direction in the circumferential portion of the first cylindrical portion, and the inner side wall portion and the outer side wall portion are at a central portion in the axial direction. The anti-vibration connecting rod according to any one of claims 1 to 4, connected by a wall connecting portion.

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