JP6266955B2 - Torque rod - Google Patents

Description

  The present invention relates to a torque rod for connecting a power unit to a vehicle body in a vibration-proof manner, for example, in an automobile, and particularly to a torque rod having a synthetic resin rod body.

  2. Description of the Related Art Conventionally, a torque rod that supports a torque reaction force of a power unit by connecting the power unit and a vehicle body in a vibration-proof manner is known. The torque rod includes a first attachment portion and a second attachment portion that are attached to each of the power unit and the vehicle body at both ends of the rod body, and the first attachment portion and the second attachment portion. At least one has a bush structure. That is, at least one of the first mounting portion and the second mounting portion has an inner shaft member inserted into an outer tube portion provided in the rod body, and the outer tube portion and the inner shaft member are mutually connected by the main rubber elastic body. The anti-vibration effect is exhibited based on the energy attenuating action due to the elastic deformation of the main rubber elastic body.

  By the way, as disclosed in Japanese Patent Application Laid-Open No. 2013-19502 (Patent Document 1) and the like, a rod body made of a metal such as iron or aluminum alloy is used for the purpose of reducing the weight of the torque rod. Attempts have been made to use synthetic resins. When such a synthetic resin rod body is adopted, in order to further reduce the weight and simplify the structure, a rubber bush having a rubber elastic body vulcanized and bonded to the outer peripheral surface of the inner shaft member is used. A structure in which a rod main body is injection molded around and an outer cylinder portion formed as a part of the rod main body is fixed to the outer peripheral surface of the main rubber elastic body is also used. According to this, it is not necessary to provide a cylindrical metal fitting for press-fitting and fixing the rubber bush to the outer cylindrical portion of the rod main body on the outer peripheral surface of the main rubber elastic body, thereby reducing the number of parts and further reducing the weight.

  However, since the rod body made of synthetic resin has smaller deformation rigidity than the rod body made of metal, the rod body is easily deformed by an input of a load, and the outer cylinder portion of the rod body may be damaged by an input of a large load. In particular, in torque rods for automobiles, in order to achieve excellent vibration isolation performance, generally, a straight hole that penetrates the main rubber elastic body is formed on both sides of the rod main body in the length direction with respect to the inner shaft member. When a large load is input in the length direction of the rod body, the inner shaft member and the outer cylinder portion arranged with the straight hole interposed therebetween come into contact with each other with a small contact area. Damage to the tube was likely to be a problem.

  In addition, in the torque rod described in Patent Document 1, the strength is ensured by making the rod body thick, but the amount of the synthetic resin material to be used increases, which may cause an increase in cost. There was a possibility that the merit of weight reduction by adopting a synthetic resin rod body could be reduced, so it was difficult to say that it was effective.

JP 2013-19502 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution is to adopt a lightweight synthetic resin rod body, and to achieve a sufficient load resistance. It is to provide a torque rod having a structure.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

That is, according to the first aspect of the present invention, the first attachment portion and the second attachment portion are provided at both ends of the rod body made of synthetic resin, and the first attachment portion and the second attachment portion are provided. A structure in which an inner shaft member is inserted into an outer cylinder part integrally formed at an end of the rod body, and the outer cylinder part and the inner shaft member are elastically connected by a main rubber elastic body. In the torque rod having the inner shaft member, a straight hole penetrating the main rubber elastic body is formed in the axial direction of the inner shaft member on both sides of the inner shaft member in the length direction of the rod body. A curved plate-shaped reinforcing member extending along the inner peripheral surface of the outer cylindrical portion is disposed between at least one of the straight holes and the outer cylindrical portion, and the circumferential length of the reinforcing member is Saga, who length of the rod body Of which is a length exceeding the circumferential extent of the currant hole is crushed by the abutment to the outer tubular portion of the inner shaft member with the input, and, the circumferential direction length of the reinforcing member, the currant hole The outer circumferential surface of the main rubber elastic body located between the circumferential directions of the straight holes provided on both sides of the inner shaft member is not covered to the whole on both sides in the circumferential direction. To do.

  According to the torque rod having the structure according to the first aspect of the present invention, the outer cylinder in which the reinforcing member that is curved and spreads along the inner peripheral surface of the outer cylinder portion is subjected to a load due to the contact of the inner shaft member. It is arrange | positioned so that the load action area | region of a part may be covered over the whole circumferential direction. Thereby, since the site | part to which the load by contact | abutting of an inner shaft member is exerted in an outer cylinder part is reinforced by a reinforcement member, even if it is a synthetic resin outer cylinder part, damage is prevented effectively.

  Furthermore, if the inner shaft member and the outer cylinder part come into contact with each other in the direction in which the straight hole is formed, the contact load may be concentrated in a narrow range, but there is a reinforcing member between the inner shaft member and the outer cylinder part. By being arranged, the contact load is spread over a wider region in the circumferential direction, and damage due to the contact load of the outer cylinder portion is avoided.

  In particular, in the structure in which the straight hole for adjusting the spring characteristics is provided in the main rubber elastic body, there is a possibility that the inner shaft member and the outer cylinder part may abut against each other at a position where the straight hole is formed. By disposing the reinforcing member in the portion where the straight hole is formed, damage to the outer cylinder portion is advantageously prevented. In addition, since the reinforcing member is disposed between the straight hole closer to the outer cylindrical portion than the inner shaft member and the outer cylindrical portion, the effect of reinforcing the outer cylindrical portion by the reinforcing member is more advantageously exerted. Damage to the tube is avoided.

  In addition, in consideration of the load acting region in the outer tube portion, the curved plate-like reinforcing member is partially provided on the portion where the load acts on the circumference of the outer tube portion. The load resistance against the input load can be sufficiently ensured with a lighter and more compact structure than the reinforcement.

  Furthermore, since the rod body including the outer cylinder portion is made of synthetic resin, the weight can be reduced, and the load resistance of the outer cylinder portion can be enhanced by the reinforcing member, so that the outer cylinder can be secured to ensure the load resistance. There is no need to increase the thickness of the part itself, and the weight reduction is realized more advantageously.

  According to a second aspect of the present invention, in the torque rod described in the first aspect, the reinforcing member extends in the circumferential direction at a length equal to or longer than a half circumference of the inner shaft member on the outer peripheral side of the inner shaft member. Is.

  According to the second aspect, for example, in addition to the input to one side in the length direction of the rod body, the reinforcing effect of the outer cylinder portion by the reinforcing member is exerted also to the input to both sides in the width direction of the rod body. Thus, durability is ensured more advantageously.

  In addition, the deformation of the outer cylinder portion due to the contact load is effectively limited by the reinforcing member, and damage due to excessive deformation of the outer cylinder portion is prevented.

  According to a third aspect of the present invention, in the torque rod described in the first or second aspect, the reinforcing member extends over the entire circumference in the circumferential direction.

  According to the third aspect, since the reinforcing member is arranged so as to cover the outer peripheral side of the straight hole so as to cover the entire circumferential direction, the inner shaft member and the outer cylinder portion come into contact with each other in a small area, and the outer The reinforcing effect of the outer cylinder part by the reinforcing member is effectively exhibited at the position where the straight hole is formed where an impact load is easily input to the cylinder part, and the durability of the outer cylinder part is effectively ensured.

  According to a fourth aspect of the present invention, in the torque rod described in any one of the first to third aspects, the entire outer peripheral surface of the reinforcing member is overlapped with the inner peripheral surface of the outer cylinder portion. Is.

  According to the fourth aspect, by distributing the load input to the outer cylinder part by disposing the reinforcing member, the durability of the outer cylinder part can be advantageously obtained. The entire outer peripheral surface of the reinforcing member does not need to be overlapped in a state of being in direct contact with the inner peripheral surface of the outer cylinder portion, for example, between the outer peripheral surface of the reinforcing member and the inner peripheral surface of the outer cylindrical portion. A rubber layer may be provided partially or entirely.

  According to a fifth aspect of the present invention, in the torque rod described in any one of the first to fourth aspects, an outer peripheral surface of the reinforcing member is exposed on an outer peripheral surface of the main rubber elastic body, The reinforcing member is superimposed in direct contact with the inner peripheral surface of the outer cylinder portion.

According to the fifth aspect, since the reinforcing member is overlapped in a state of being in direct contact with the outer cylindrical portion, and the substantial thickness of the outer cylindrical portion is increased by the reinforcing member, the durability of the outer cylindrical portion is increased. It is secured advantageously. In addition, since the reinforcing member that is harder than the rubber elastic body and the outer cylinder part are brought into direct contact with each other, the load from the reinforcing member to the outer cylinder part is stably transmitted over the entire abutting surface. Decentralization is realized efficiently. Moreover, as compared with the case where the entire outer cylinder portion is thick, the load acting area in the outer cylinder portion is partially reinforced, so that an increase in weight is avoided and weight reduction is effectively realized. The
According to a sixth aspect of the present invention, in the torque rod described in any one of the first to fifth aspects, in the length direction of the rod body, the positions of the circumferential ends of the straight hole are the In addition to being positioned inside the center position of the inner shaft member, the positions of both ends in the circumferential direction of the reinforcing member are positioned inside the positions of both ends in the circumferential direction of the straight hole.

  According to the present invention, the curved plate-shaped reinforcing member along the inner peripheral surface of the outer cylindrical portion is disposed between the straight hole and the outer cylindrical portion, and the reinforcing member is disposed around the load acting region of the outer cylindrical portion. It extends to cover the whole direction. Therefore, when a load is input between the inner shaft member and the outer cylinder portion and the inner shaft member comes into contact with the outer cylinder portion, a reinforcing member is interposed between the inner shaft member and the outer cylinder portion, Since the contact load is distributed over a wide range with respect to the cylindrical portion, the durability of the outer cylindrical portion formed of synthetic resin is ensured.

  Further, the rod body including the outer cylinder portion is formed of synthetic resin, and the reinforcing member is partially provided, so that weight reduction is also effectively realized.

The top view which shows the torque rod as 1st embodiment of this invention. It is sectional drawing of the torque rod shown in FIG. 1, Comprising: The figure corresponded in the II-II cross section of FIG. III-III sectional drawing of FIG. FIG. 4 is a cross-sectional view illustrating a state in which a load in the rod axis direction is input to the torque rod illustrated in FIG. 1, corresponding to a cross section taken along line IV-IV in FIG. 5. VV sectional drawing of FIG. It is sectional drawing which shows the torque rod as 2nd embodiment of this invention, Comprising: The figure corresponded in the VI-VI cross section of FIG. VII-VII sectional drawing of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1-3 show a torque rod 10 as a first embodiment of the present invention. The torque rod 10 is provided with a first bush 14 as a first mounting portion at one end of the rod body 12 and a second as a second mounting portion at the other end of the rod body 12. The bush 16 is provided.

  More specifically, the rod body 12 is a longitudinal member formed of a hard synthetic resin, and includes a first outer cylinder portion 18 at one end and a first end at the other end. Two outer cylinder portions 20 are provided. In the present embodiment, the first outer cylinder portion 18 is substantially cylindrical, and the second outer cylinder portion 20 is irregularly shaped. Specifically, the second outer cylinder part 20 is generally a pentagonal cylinder with rounded corners as a whole, and the inner wall part in the length direction (vertical direction in FIG. 2) of the rod body 12 is in the rod width direction. And the wall portions on both sides in the width direction (left and right direction in FIG. 2) of the rod main body 12 are substantially flat plate shapes extending in the rod length direction. The wall portion on the outside in the length direction has a bent plate shape that gradually becomes narrower toward the outside in the rod length direction. The rod body 12 is preferably formed of, for example, a synthetic resin reinforced with glass fiber or carbon fiber to ensure high deformation rigidity.

  A first bush 14 is provided at one end in the length direction of the rod body 12 by using the first outer cylinder portion 18. The first bush 14 is inserted with a first inner shaft member 22 having a substantially cylindrical shape with a small diameter through the first outer cylinder portion 18, and the first outer cylinder portion 18 and the first inner shaft. The members 22 have a structure in which they are elastically connected to each other by a substantially cylindrical first main rubber elastic body 24. Further, the first outer cylindrical portion 18 is integrally formed with a first retaining protrusion 26 that protrudes toward the inner peripheral side with respect to both ends in the axial direction at the central portion in the axial direction. Both ends in the axial direction of 24 are locked to the first retaining projection 26 in the axial direction.

  A second bush 16 is provided at the other end in the length direction of the rod body 12 by using the second outer cylinder portion 20. The second bush 16 has a second inner shaft member 28 having a small diameter and a substantially cylindrical shape inserted through the second outer tube portion 20, and the second outer tube portion 20 and the second inner shaft. The members 28 have a structure in which they are elastically connected to each other by a second main rubber elastic body 30 having a thick and substantially cylindrical shape. Furthermore, the second outer cylindrical portion 20 is integrally formed with a second retaining protrusion 32 that protrudes inward from the axial end portions at the central portion in the axial direction. Both axial end portions of 30 are locked to the second retaining protrusion 32 in the axial direction.

  In this embodiment, the rod body 12 and the first and second inner shaft members 22 and 28 are set in the cavities of the molding dies of the first and second body rubber elastic bodies 24 and 30. The first and second main rubber elastic bodies 24 and 30 are vulcanized. As a result, the inner peripheral surface of the first main rubber elastic body 24 is vulcanized and bonded to the first inner shaft member 22, and the outer peripheral surface is bonded to the first outer cylinder portion 18, while the second The inner peripheral surface of the main rubber elastic body 30 is vulcanized and bonded to the second inner shaft member 28, and the outer peripheral surface is bonded to the second outer cylinder portion 20.

  Furthermore, the outer peripheral surface of the 1st, 2nd main body rubber elastic bodies 24 and 30 is formed with the circumferential groove which continues over the perimeter in the axial center part, The 1st, 2nd main body rubber By forming the first and second outer tube portions 18 and 20 on the outer peripheral surfaces of the elastic bodies 24 and 30, the first and second retaining projections 26 and 32 fitted in the respective circumferential grooves are formed. Is formed.

  Further, the second main rubber elastic body 30 is formed with an inner slit 34 and an outer slit 36 as a straight hole. The inner slit 34 is formed on the first bush 14 side, which is one side in the rod length direction with respect to the second inner shaft member 28, and fills a half circumference on the outer peripheral side of the second inner shaft member 28. It extends in the circumferential direction with a length that is not long, and penetrates through the second main rubber elastic body 30 in the inner central axis direction (left-right direction in FIG. 3). On the other hand, the outer slit 36 is formed on the other side in the rod length direction with respect to the second inner shaft member 28, and has a substantially half circumference length in the circumferential direction on the outer peripheral side of the second inner shaft member 28. While extending, it penetrates the second main rubber elastic body 30 in the inner central axis direction.

  By forming such inner and outer slits 34 and 36, the second main rubber elastic body 30 extends between the inner and outer slits 34 and 36 in the circumferential direction so that the second outer cylinder 20 and the second A pair of rubber legs 38, 38 for connecting the inner shaft member 28 is formed. As shown in FIG. 2, the rubber legs 38, 38 of the present embodiment extend while inclining in the rod length direction as they go outward in the rod width direction. The second main rubber elastic body 30 includes a cylindrical outer rubber layer 40 that covers the inner peripheral surface of the second outer cylinder portion 20 and a cylindrical inner cover that covers the outer peripheral surface of the second inner shaft member 28. The peripheral rubber layer 42 and a pair of rubber legs 38, 38 connecting the outer peripheral rubber layer 40 and the inner peripheral rubber layer 42 are integrally formed.

  A reinforcing member 44 is fixed to the second main rubber elastic body 30. The reinforcing member 44 is a member having a deformation rigidity larger than that of the second outer cylinder portion 20, and has a thin curved plate shape that extends along the inner peripheral surface of the second outer cylinder portion 20. The reinforcing member 44 may be formed of, for example, iron, but more preferably, is formed of a material having a small specific gravity such as an aluminum alloy or a synthetic resin for weight reduction. As is clear from the fact that the reinforcing member 44 is disposed on the second bush 16, the outer cylinder portion according to the present invention is constituted by the second outer cylinder portion 20 and the inner shaft member. Is constituted by the second inner shaft member 28, and the main rubber elastic body is constituted by the second main rubber elastic body 30.

  The reinforcing member 44 is disposed on the outer side in the rod length direction with respect to the second inner shaft member 28 and is embedded in the outer peripheral rubber layer 40 of the second main rubber elastic body 30. The outer cylinder portion 20 and the outer slit 36 spread in the circumferential direction. Further, the reinforcing member 44 is overlapped with the entire outer peripheral surface thereof in contact with the inner peripheral surface of the second outer cylinder portion 20 via the outer peripheral rubber layer 40. In the present embodiment, the distance between the opposing surfaces of the reinforcing member 44 and the second outer cylinder portion 20 is substantially constant throughout the reinforcing member 44. Furthermore, the reinforcing member 44 of the present embodiment is disposed opposite to the inner peripheral side of the second retaining projection 32 of the second outer cylinder portion 20.

  Further, both end portions in the circumferential direction of the reinforcing member 44 extend to the outer side in the circumferential direction than both end portions in the circumferential direction of the outer slit 36, and the reinforcing member 44 covers the entire outer periphery of the outer slit 36 in the circumferential direction. . The outer slit 36 extends in the circumferential direction so as to surround the outer peripheral side of the second inner shaft member 28 over a region longer than a half circumference, and the reinforcing member 44 extends the outer peripheral side of the second inner shaft member 28. It extends in the circumferential direction so as to surround a region longer than a half circumference. In other words, in the length direction of the rod main body 12, the position of the outer slit 36 in the circumferential direction (the two-dot chain line in FIG. 2) is the center position of the second inner shaft member 28 (three in FIG. 2). 2, the position of the circumferential end of the reinforcing member 44 (one-dot chain line in FIG. 2) is the position of the circumferential end of the outer slit 36 (two points in FIG. 2). It is located inside the chain line. On the other hand, the reinforcing member 44 extends in a circumferential length less than one round so as to partially cover the inner circumferential surface of the second outer cylinder portion 20 on the circumference. The outer cylinder part 20 extends in the circumferential direction so as to cover a region that is less than a half circumference.

  In the torque rod 10 having such a structure, the first inner shaft member 22 of the first bush 14 is attached to a vehicle body (not shown), and the second inner shaft member 28 of the second bush 16 is shown. Not attached to the power unit. Thereby, the torque reaction force of the power unit is supported by the vehicle body via the torque rod 10, and the roll displacement of the power unit is limited.

  In such a vehicle mounted state, when a large load in the rod length direction due to vehicle deceleration or the like is input to the torque rod 10, the second outer cylindrical portion that the second inner shaft member 28 faces with the inner slit 34 interposed therebetween. The amount of relative displacement between the second inner shaft member 28 and the second outer cylinder portion 20 is limited by contacting the inner portion of the 20 rod length direction. On the other hand, when a large load in the rod length direction due to vehicle acceleration or the like is input to the torque rod 10, the second inner shaft member 28 is opposed to the outer slit 36 with the second inner shaft member 28 therebetween, as shown in FIGS. The amount of relative displacement between the second inner shaft member 28 and the second outer cylinder portion 20 is limited by abutting against the outer portion of the second outer cylinder portion 20 in the rod length direction. Accordingly, stopper means for limiting the relative displacement amount of the second inner shaft member 28 and the second outer cylinder portion 20 in the rod length direction is provided.

  As shown in FIGS. 4 and 5, the second inner shaft member 28 and the second outer cylinder portion 20 are in contact with each other in the rod length direction outer portion via a reinforcing member 44. Here, the second outer cylinder portion 20 has a load acting region (region indicated by W in FIG. 4) to which a load due to the contact of the second inner shaft member 28 is directly applied. It spreads in the circumferential direction length that covers the entire load acting area of the second outer cylinder portion 20. As a result, the load acting region of the second outer cylinder portion 20 is reinforced by the reinforcing member 44, and damage to the second outer cylinder portion 20 due to the contact of the second inner shaft member 28 is prevented.

  In particular, since the reinforcing member 44 is disposed on the outer side in the rod length direction with respect to the second inner shaft member 28, the portion where the strength is likely to be small in the second outer cylindrical portion 20 is effectively reinforced. can do.

  Further, since the outer slit 36 is formed between the second inner shaft member 28 and the second outer cylinder portion 20, the second inner shaft member 28 and the second outer cylinder portion 20 are shocked. Although it can contact, the reinforcement of the second outer cylinder part 20 by the reinforcing member 44 prevents the second outer cylinder part 20 from being damaged. Accordingly, the spring constant in the rod length direction can be set small in the second bush 16 to achieve excellent vibration isolation performance, and damage to the second outer cylinder portion 20 can be prevented. In the present embodiment, since the reinforcing member 44 spreads so as to cover the entire outer periphery of the outer slit 36 in the circumferential direction, the second inner shaft member 28 and the second outer cylinder portion 20 are partially and shocking. The second outer cylinder portion 20 is effectively reinforced by the reinforcing member 44 at a portion where the outer slit 36 can be abutted.

  In addition, since the reinforcing member 44 has a shape along the inner peripheral surface of the second outer cylinder portion 20, the second inner shaft member 28 is in direct contact with the second outer cylinder portion 20. Thus, the contact load is distributed over a wide range of the second outer cylinder portion 20. Therefore, damage to the second outer cylinder portion 20 due to the action of a local heavy load is avoided, and durability is improved. Further, since the entire outer peripheral surface of the reinforcing member 44 is overlapped with the inner peripheral surface of the second outer cylinder portion 20 in an indirect contact state via the outer peripheral rubber layer 40, a wide range. The load can be effectively distributed, and the durability of the second outer cylinder portion 20 can be improved more advantageously. In addition, since the distance between the opposing surfaces of the reinforcing member 44 and the second outer cylinder portion 20 is substantially constant throughout, the contact load is not concentrated on the second outer cylinder portion 20. Due to the dispersing action, damage to the second outer cylinder part 20 is advantageously prevented.

  Furthermore, in the present embodiment, in the projection in the rod length direction, the reinforcing member 44 extends to the outside in the rod width direction with respect to the load acting region of the second outer cylinder portion 20. Therefore, when the contact load of the second inner shaft member 28 is exerted on the second outer cylinder portion 20 via the reinforcing member 44, the second inner shaft member 28 is dispersed and acted on the second outer cylinder portion 20. Damage to the outer cylinder 20 is advantageously avoided.

  Furthermore, since the reinforcing member 44 extends in the circumferential direction with a length of a half or more on the outer peripheral side of the second inner shaft member 28, the second inner shaft member 28 and the second outer cylinder portion 20 At the time of contact in the rod length direction, deformation of the second outer cylinder portion 20 is limited by the reinforcing member 44. Thereby, the damage by the excessive deformation | transformation of the 2nd outer cylinder part 20 is avoided, and durability improvement is achieved.

  Moreover, since the rod main body 12 is made of a synthetic resin, the torque rod 10 is lighter than a case where a metal rod main body is employed. Moreover, since the second outer cylinder portion 20 of the rod body 12 is partially reinforced by the reinforcing member 44 in consideration of the load input portion, it is lighter than the case where the entire circumference is thickened and reinforced. Is realized.

  Further, in the rod body 12 made of synthetic resin, a weak portion such as a weld or a resin injection hole is provided outside the second outer cylinder portion 20 in the rod length direction, and the weak portion is reinforced by the reinforcing member 44. By doing so, it is possible to prevent the partially weakened portion of the rod body 12 from being damaged and to improve durability.

  6 and 7 show a torque rod 50 as a second embodiment of the present invention. The torque rod 50 has a structure in which a first bush 14 as a first attachment portion and a second bush 52 as a second attachment portion are provided at both ends of the rod body 12. In addition, about the member and site | part substantially the same as 1st embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol in a figure.

  More specifically, the second bush 52 has a reinforcing member 54 fixed to the outer peripheral rubber layer 40 of the second main rubber elastic body 30. The reinforcing member 54 has a curved plate shape along the inner peripheral surface of the second outer cylinder portion 20, and is fixed in a state where it is exposed to the outer peripheral surface of the outer peripheral rubber layer 40. It is in direct contact with the inner peripheral surface of the material. In the present embodiment, the entire outer peripheral surface of the reinforcing member 54 is exposed from the outer peripheral rubber layer 40, and the entire outer peripheral surface of the reinforcing member 54 is in contact with the inner peripheral surface of the second outer cylinder portion 20. Yes.

  Also in the torque rod 50 having the structure according to the present embodiment, the second outer cylinder portion 20 is obtained by the reinforcing effect and the load dispersion by the reinforcing member 54 as in the torque rod 10 of the first embodiment. Damage can be avoided, and durability can be improved.

  Further, in the present embodiment, since the hard reinforcing member 54 and the hard second outer cylinder portion 20 are superposed in a direct contact state, the contact load is more efficiently distributed. Thus, the durability of the second outer cylinder portion 20 can be improved more advantageously.

  In addition, since the outer peripheral rubber layer 40 is provided with a large thickness only on the inner peripheral side of the reinforcing member 54, when the second inner shaft member 28 contacts the reinforcing member 54, the buffering action by the outer peripheral rubber layer 40 is provided. Effectively exerted, it is possible to reduce or avoid the deterioration of riding comfort due to the impact at the time of contact.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the structure of the present invention may be applied to at least one of the first and second mounting portions, and in the embodiment in which the structure of the present invention is applied to the second bush 16 as the second mounting portion. The structure of the first mounting portion can be changed as appropriate. Specifically, for example, a rigid structure to the vehicle body may be employed as the first attachment portion, or a bush having a different structure such as a pillow ball bush may be employed.

  Furthermore, the structure of the present invention can be applied to both the first and second attachment portions. That is, in the torque rod 10 of the above embodiment, the first bush may have the same structure arranged symmetrically with the second bush 16.

  Furthermore, in the torque rod 10 of the above-described embodiment in which only the second attachment portion has the structure of the present invention, the specific structure of the second bush 16 can be appropriately changed as long as the structure of the present invention is followed. Specifically, a liquid seal bush having a fluid chamber in which an incompressible fluid is sealed can be employed as the second bush.

  Furthermore, in the said embodiment, although the 2nd outer cylinder part 20 was made into the unusual shape cylinder shape (substantially rounded pentagonal cylinder shape), the shape of the 2nd outer cylinder part 20 is not specifically limited, For example, cylindrical shape It may be.

  The reinforcing member only needs to extend in the circumferential direction with a length that covers the entire load acting region in the outer cylinder portion, and the reinforcing member 44, the outer slit 36, and the second inner shaft member 28 described in the above embodiment. The relationship in the circumferential length is merely an example and is not essential. Further, as the reinforcing member, a C-shaped plate extending in a circumferential direction with a length that greatly exceeds a half circumference may be employed.

  Further, both end portions in the circumferential direction of the reinforcing member 44 may extend to the pair of rubber legs 38 in the second main rubber elastic body 30. Preferably, the circumferential length of the reinforcing member 44 extending around the outer periphery of the rubber legs 38, 38 is set to be not more than half of the circumferential length of the rubber legs 38, 38, and more preferably not more than 1/4. It is assumed. According to this, the restraint of the rubber legs 38, 38 by the reinforcing member 44 is avoided, and the durability of the rubber legs 38, 38 is improved by ensuring the free length.

  Moreover, in the said embodiment, although the structure where the reinforcement member 44 was arrange | positioned with respect to the 2nd inner shaft member 28 on the outer side of a rod length direction is illustrated, it is provided inside the rod length direction. Alternatively, reinforcing members may be provided on both the inner and outer sides. In addition, when providing a some reinforcement member, these reinforcement members are arrange | positioned so that a clearance gap may be made in at least one part on a periphery, without covering the inner peripheral surface of an outer cylinder part over a perimeter.

10, 50: Torque rod, 12: Rod body, 14: First bush (first mounting portion), 16, 52: Second bush (second mounting portion), 20: Second outer cylinder portion (Outer cylinder portion), 28: second inner shaft member (inner shaft member), 30: second main rubber elastic body (main rubber elastic body), 36: outer slit (straight hole), 44, 54: reinforcement Element

Claims (6)

A first mounting portion and a second mounting portion are provided at both ends of the rod main body formed of synthetic resin, and at least one of the first mounting portion and the second mounting portion is the rod main body. In the torque rod having a structure in which an inner shaft member is inserted into an outer cylindrical portion formed integrally with the end of the outer cylindrical portion, and the outer cylindrical portion and the inner shaft member are elastically connected by a main rubber elastic body,
On both sides of the inner shaft member sandwiched in the length direction of the rod main body, a straight hole penetrating the main rubber elastic body in the axial direction of the inner shaft member is formed, and at least one of the straight holes and A curved plate-shaped reinforcing member extending along the inner peripheral surface of the outer cylinder portion is disposed between the outer cylinder portions,
Circumferential length of the reinforcing member, is a length exceeding the circumferential extent of the currant hole is crushed by the abutment to the outer tubular portion of the inner shaft member with the input of the length direction of the rod body And
The length of the reinforcing member in the circumferential direction is such that the outer circumferential surface of the main rubber elastic body located between the circumferential directions of the straight holes provided on both sides of the inner shaft member on both sides in the circumferential direction of the straight holes. The torque rod is characterized in that the length is not covered .   2. The torque rod according to claim 1, wherein the reinforcing member extends in a circumferential direction over an area of a half circumference or more of the inner shaft member on an outer peripheral side of the inner shaft member.   The torque rod according to claim 1, wherein the reinforcing member extends so as to cover an entire outer periphery of the straight hole in the circumferential direction.   The torque rod as described in any one of Claims 1-3 with which the whole outer peripheral surface of the said reinforcement member is overlaid on the inner peripheral surface of the said outer cylinder part.   The outer peripheral surface of the reinforcing member is exposed on the outer peripheral surface of the main rubber elastic body, and the reinforcing member is in direct contact with and overlapped with the inner peripheral surface of the outer cylinder portion. The torque rod according to one item. In the length direction of the rod body, the positions of the circumferential end portions of the straight hole are located inside the center position of the inner shaft member, and the positions of the circumferential end portions of the reinforcing member are The torque rod as described in any one of Claims 1-5 located inside the position of the circumferential direction both ends of this straight hole.

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