JP2012013211A - Vibration damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent relative displacement exceeding a set maximum stroke amount, in a vibration damper which connects a body to be supported in a power plant or the like and a vehicle body.SOLUTION: A torque rod 1 includes a stopper 55 having a first guide 551 which is inclined with respect to up-and-down directions of the vehicle body at one side in the up-and-down directions of the vehicle body with a reference shaft A sandwiched therebetween, and a second guide 552 which is inclined with respect to the up-and-down directions of the vehicle body in a reverse direction with respect to the first guide 551 at the other side of the up-and-down directions of the vehicle body with the reference shaft A sandwiched therebetween. By this arrangement, when the side of a second internal cylindrical body 4 abuts on the stopper 55 by being displaced from the reference shaft A, the side of the second internal cylindrical body 4 relatively moves along the first guide 551 or the second guide 552 so as to approximate the reference shaft A. Finally, the second internal cylindrical body 4 is located on the reference shaft A. By this arrangement, the turn of a bracket 2 is avoided.

Description

  The present invention relates to a vibration isolator that connects a support body such as a power plant of an automobile and a vehicle body.

  Conventionally, for example, in a front engine / front drive (FF) type vehicle, generally, a power plant in which an engine and a transmission are connected in series is placed in an engine room so that a longitudinal direction thereof is a vehicle width direction. On the other hand, a so-called horizontal mounting method that is disposed horizontally is adopted. As an example of the horizontal mounting system, both ends in the longitudinal direction of the power plant are elastically supported with respect to the side frame of the vehicle by vibration isolating mounts, and these two vibration isolating mounts are used as the main spindle (roll axis) of the power plant. There is a so-called pendulum mount system in which the power plant is supported so as to be swingable like a pendulum around a swing support shaft connecting the support points of the loads of each vibration-proof mount by disposing the power plant at a higher position. In the Pendulum mount system, for example, when a large driving reaction force is applied, such as during a sudden acceleration / deceleration of an automobile, the power plant tends to shake greatly in the longitudinal direction of the body like a pendulum. The lower end of the plant and the vehicle subframe located behind the vehicle body of the power plant are regulated by being connected via a torque rod (vibration isolation device) as disclosed in Patent Document 1, for example. Yes.

  The torque rod disclosed in Patent Document 1 has a first cylindrical portion having relatively small cylindrical holes at both ends in the longitudinal direction thereof, and opens in the same direction as the cylindrical hole of the first cylindrical portion. And a second cylindrical portion having a relatively large cylindrical hole. A first inner cylindrical body is disposed in the cylindrical hole of the first cylindrical portion, and the first inner cylindrical body and the first cylindrical portion are connected by a rubber elastic body. The cylinder hole of the second cylindrical part has a substantially octagonal shape when viewed in the cylinder axis direction, and the second inner cylinder is parallel to the cylinder axis of the first inner cylinder at a substantially central position thereof. It is arranged like this. And the 2nd inner cylinder and the 2nd cylindrical part are connected by the elastic body. The elastic body has a through-hole penetrating the elastic body in the cylinder axis direction of the second inner cylinder on both sides in the longitudinal direction (the direction perpendicular to the cylinder axis of the second inner cylinder) across the second inner cylinder. As a result, a main spring portion extending in a substantially radial direction from the second inner cylindrical body toward the second cylindrical portion is formed.

  When the torque rod configured as described above is applied to the pendulum mount system, the longitudinal direction thereof is the longitudinal direction of the vehicle body (main load input direction), and the short direction perpendicular to the longitudinal direction is the vehicle body. The first inner cylinder is connected to the power plant (supported body) so as to be in the vertical direction, while the second inner cylinder is connected to the subframe (vehicle body) of the vehicle.

  Thus, of the inner peripheral surface of the octagonal second cylindrical part, the installation part facing the second cylindrical part on the first cylindrical part side is substantially flat in the lateral direction. In this installation portion, a stopper made of a rubber elastic body is provided with a substantially constant thickness. Accordingly, the stopper is formed to be opposed to the second inner cylinder in the longitudinal direction through the through hole and substantially flat in the short direction (substantially flat in the orthogonal direction orthogonal to the main load input direction). ing. When the second inner cylinder and the second cylindrical part are relatively displaced in the longitudinal direction, the stopper is a second inner cylinder (more precisely, an elastic body part surrounding it, and in the following, 2 inner cylinder and the elastic body part surrounding the inner cylinder may be referred to as the second inner cylinder side), and thereby the second inner cylinder and the second cylindrical portion Has a function of restricting relative displacement in the longitudinal direction to a predetermined amount.

Japanese Patent No. 4046072

  Like the torque rod disclosed in Patent Document 1, the cylindrical hole shape of the second cylindrical portion is polygonal when viewed in the cylinder axial direction, which improves the tuning width of the spring characteristics and enlarges the free length of the main spring. This is advantageous in diversifying the stopper shapes.

  However, in the torque rod having such a polygonal cylindrical hole shape, the inventors of the present application input a load to the torque rod so that the second cylindrical portion and the second inner cylindrical body are largely opposed in the longitudinal direction of the vehicle body. It has been found that when a displacement occurs, a phenomenon may occur in which the displacement exceeds the maximum stroke amount determined by the stopper. If the relative displacement exceeds the maximum stroke amount, the power plant will be displaced more than the setting, which may cause interference between the power plant and other parts or parts.

  The present invention has been made in view of the above points, and an object thereof is to provide a relative displacement exceeding a set maximum stroke amount in a vibration isolator that connects a support body such as a power plant and a vehicle body. This is to surely prevent this.

  The inventors of the present application have examined the above phenomenon, and as a result, the vibration isolator having a polygonal cylindrical hole shape, in particular, the installation portion provided with the stopper becomes substantially flat in the orthogonal direction perpendicular to the main load input direction. In the vibration isolator, when the relative displacement between the second cylindrical portion and the second inner cylindrical body is along the main load input direction, in other words, the cylindrical shaft of the first inner cylindrical body and the second cylindrical portion. If the second inner cylinder is relatively displaced on a reference axis that extends in the main load input direction by connecting it to the cylinder axis and abuts against an installation part (stopper) orthogonal to the main load input direction, The relative displacement of the second inner cylinder after contact is restricted, and an increase in the stroke amount beyond that is avoided.

  On the other hand, when the direction of the load input to the vibration isolator is deviated and the second inner cylinder is deviated from the reference axis and is relatively displaced and comes into contact with the stopper of the installation portion, the bracket rotates. The inventors of the present application have found that the second inner cylinder further displaces in the main load input direction by the amount of rotation of the bracket.

  Accordingly, the present invention has been completed by paying attention to preventing the bracket from rotating even if the second inner cylinder is displaced relative to the reference axis.

  The vibration isolator of the present invention is intended for a vibration isolator that connects a supported body and a vehicle body.

  In the first aspect of the invention, the vibration isolator is disposed on the vehicle body side with a first cylindrical portion disposed on the supported body side and an interval in the main load input direction with respect to the first cylindrical portion. And a bracket having a second cylindrical portion disposed on the first cylindrical portion, a connecting portion connecting the first cylindrical portion and the second cylindrical portion, and a cylindrical hole of the first cylindrical portion. And a first inner cylinder that is elastically connected to the first cylindrical part and connected to the supported body, and a cylinder shaft of the first inner cylinder in a cylindrical hole of the second cylindrical part. A second inner cylindrical body connected to the vehicle body, a rubber elastic body connecting the second cylindrical portion and the second inner cylindrical body, and the second Of the inner peripheral surface of the cylindrical portion, the second cylindrical portion and the second cylindrical portion are provided in an installation portion that is a portion facing the second inner cylindrical body in the main load input direction and the load is input. A stopper that regulates the relative displacement by abutting against the second inner cylinder when the inner cylinder is relatively displaced in the main load input direction, and the stopper includes the first inner cylinder. The reference axis on one side in the orthogonal direction perpendicular to the main load input direction, sandwiching a reference axis extending in the main load input direction so as to connect the cylinder axis of the body and the cylinder axis of the second cylindrical portion The first guide portion inclined with respect to the orthogonal direction and the orthogonal direction across the reference axis so as to move away from the cylindrical axis of the second cylindrical portion as approaching the reference axis from the side away from On the other side, there is a second guide portion that is inclined with respect to the orthogonal direction in a direction opposite to the first guide portion, and the second inner cylindrical body side of the stopper is caused by the input load. When the first guide portion or the second guide portion abuts, the second inner cylinder Side is, the first guide portion or along the second guide portion is configured to relative movement closer to the reference axis.

  Here, the “second inner cylinder side” includes not only the second inner cylinder itself but also the elastic body when the elastic body is integrally provided on the surface of the second inner cylinder. Meaning.

  According to this configuration, when, for example, a load from the supported body (load in the main load input direction) is input to the vibration isolator, the second cylindrical portion and the second inner cylinder are relative to each other in the main load input direction. The second inner cylinder side and the stopper come into contact with each other after being displaced.

  On the other hand, when the second inner cylinder is displaced relative to the reference axis and is displaced relative to the reference axis, the first of the stopper When it comes into contact with the guide and shifts to the other side perpendicular to the reference axis, it comes into contact with the second guide of the stopper. Here, since the first guide portion is inclined with respect to the orthogonal direction so as to be away from the cylindrical axis of the second cylindrical portion as it approaches the reference axis from the side away from the reference axis, the second inner cylinder side is After coming into contact with the first guide portion, the second inner cylinder body is finally positioned on the reference axis by relatively moving along the first guide portion. In addition, since the second guide portion is inclined with respect to the orthogonal direction in the opposite direction to the first guide portion, the second guide portion after the second inner cylindrical body abuts against the second guide portion. In this case, the second inner cylinder is finally positioned on the reference axis.

  Thus, when the second inner cylinder is displaced relative to the reference axis and is in contact with the first or second guide portion, the position of the second inner cylinder is moved by the first or second guide portion. Since it is corrected to be on the reference axis, the bracket is prevented from rotating. As a result, relative displacement of the second inner cylinder exceeding the maximum stroke amount is reliably prevented.

  In the second invention, the vibration isolator is disposed on the vehicle body side with an interval in the main load input direction with respect to the first tubular portion disposed on the supported body side and the first tubular portion. A second cylindrical part, a bracket having a connecting part for connecting the first cylindrical part and the second cylindrical part, and disposed in a cylindrical hole of the first cylindrical part, A first inner cylindrical body that is elastically connected to the first cylindrical portion and connected to the supported body, and a cylinder axis of the first inner cylindrical body in a cylindrical hole of the second cylindrical portion. A second inner cylinder connected to the vehicle body, a rubber elastic body connecting the second cylindrical portion and the second inner cylinder, and the second cylindrical shape. The second cylindrical portion and the second inner portion are provided in an installation portion which is a portion opposed to the second inner cylindrical body in the main load input direction and the load is input. Cylinder A stopper that restricts the relative displacement by abutting against the second inner cylinder side when it is relatively displaced in the main load input direction, and the installation portion is a cylinder of the first inner cylinder body A reference axis extending in the main load input direction so as to connect the shaft and the cylinder axis of the second cylindrical portion is spaced apart from the reference axis on one side in an orthogonal direction perpendicular to the main load input direction. On the other side of the orthogonal direction across the reference axis and the first installation surface inclined with respect to the orthogonal direction so as to move away from the cylindrical axis of the second cylindrical portion as approaching the reference axis from the other side And a second installation surface that is inclined with respect to the orthogonal direction in a direction opposite to the first installation surface, and the stopper is provided along the first installation surface and the second installation surface. And the second inner cylinder side is caused to move by the input load. When in contact with the Tsu path it is configured such that the second inner cylinder side is the relative movement closer to the reference axis along the first installation surface or the second installation surface.

  Here, the “second inner cylinder side” includes not only the second inner cylinder itself but also the elastic body when the elastic body is integrally provided on the surface of the second inner cylinder. Meaning.

  According to this configuration, when the second inner cylinder body is displaced relative to one side in the orthogonal direction from the reference axis, the second inner cylinder abuts on the stopper on the first installation surface side in the installation part, and on the other side in the orthogonal direction. When the relative displacement occurs, the contact is made with the stopper on the second installation surface side in the installation part. The first installation surface is inclined with respect to the orthogonal direction so as to move away from the tube axis of the second tubular portion as approaching the reference axis from the side away from the reference axis, like the first guide portion. Therefore, when it comes into contact with the stopper on the first installation surface side, it moves relative to the stopper along the first installation surface so that the second inner cylinder is finally positioned on the reference axis. become. In addition, since the second installation surface is inclined with respect to the orthogonal direction in the opposite direction to the first installation surface, the second installation surface is in contact with the second installation surface after the second installation surface is in contact with the second installation surface. The relative movement on the stopper is performed along the surface, and at this time, the second inner cylinder is finally located on the reference axis.

  Thus, also in the second invention, similarly to the first invention, when the second inner cylinder is displaced relative to the reference axis, the second inner cylinder is moved by the first installation surface or the second installation surface. Since the position of the body is corrected to be on the reference axis, the rotation of the bracket is avoided, and the relative displacement of the second inner cylinder exceeding the maximum stroke amount is reliably prevented.

  In a third invention, in the first or second invention, the second inner cylindrical body, the second cylindrical portion, and the rubber elastic body are integrally formed by vulcanization.

  As one method of disposing the second inner cylindrical body in the cylindrical hole of the second cylindrical portion, there is a method of press-fitting a rubber bush having the second inner cylindrical body and the outer cylindrical body into the second cylindrical portion. is there. In this method of press-fitting the rubber bush, the shape of the cylindrical hole of the second cylindrical portion needs to be circular or elliptical when viewed in the cylinder axial direction so that the rubber bush can be press-fitted. On the other hand, if the second cylindrical portion, the second inner cylindrical body, and the rubber elastic body are formed by vulcanization integral molding, the cylindrical hole shape of the second cylindrical portion is circular or elliptical when viewed in the cylinder axial direction. It is not necessary to have a shape, and it can be a desired shape. For example, it has a polygonal cylindrical hole shape that is advantageous for improving the tuning range of the spring characteristics, expanding the free length of the main spring, and diversifying the stopper shape. A 2nd cylindrical part can be implement | achieved.

  As described above, in the vibration isolator of the present invention, when the second inner cylinder side is displaced from the reference axis and comes into contact with the stopper, the position of the second inner cylinder is corrected to be on the reference axis. Thus, since the pivot of the bracket is avoided, it is possible to reliably prevent relative displacement exceeding the set maximum stroke amount.

1 is a perspective view showing a schematic configuration of an automobile engine mount system. FIG. FIG. 3 is a side view of the torque rod according to the first embodiment. 6 is a side view of a torque rod according to Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.
(Embodiment 1)
FIG. 1 is a perspective view showing a schematic configuration of an automobile engine mount system according to an embodiment. In FIG. 1, the symbol P is a power plant in which an engine E and a transmission T are connected in series.

  The power plant P is disposed horizontally with respect to the engine room so that the longitudinal direction thereof is the vehicle width direction. The power plant P is provided with anti-vibration mounts M1 and M2 disposed at both ends in the longitudinal direction. The side frame S is elastically supported. Thus, the two vibration isolating mounts M1 and M2 are respectively disposed at positions higher than the inertia main shaft (roll axis) of the power plant P, and thus the power plant P has two vibration isolating mounts. It can be swung like a pendulum around a swinging support shaft connecting the load supporting points of the mounts M1 and M2.

  In this engine mounting system, for example, when a large driving reaction force is applied, such as during a sudden acceleration / deceleration of an automobile, the power plant P tends to shake greatly in the longitudinal direction of the vehicle body like a pendulum. The lower end portion of the power plant P and the vehicle subframe F located behind the vehicle body of the power plant P are regulated by being connected via the torque rod 1. The power plant P constitutes a supported body, and the subframe F constitutes a vehicle body. In this engine mount system, the main load input direction is the vehicle longitudinal direction, and the orthogonal direction perpendicular to the vehicle longitudinal direction is the vehicle vertical direction.

  As shown in FIG. 2, the torque rod 1 has a first cylindrical portion 21 having a relatively small cylindrical hole, and is spaced from the first cylindrical portion 21 in the main load input direction (that is, the longitudinal direction of the vehicle body). And a second cylindrical portion 22 having a relatively large cylindrical hole that opens in the same direction as the cylindrical hole of the first cylindrical portion 21, and the first cylindrical portion 21 and the second cylinder. The bracket 2 having a substantially bowl-like shape in a side view is provided. The bracket 21 is connected to the power plant P, and the second cylindrical portion 22 side is a subframe. Connected to F.

  The first cylindrical portion 21 has a cylindrical shape, and the rubber bush 3 is fitted into the cylindrical hole so as to be coaxial.

  The rubber bush 3 has a first inner cylinder 31 and a rubber elastic body integrally provided on the outer periphery of the first inner cylinder 31.

  The first inner cylinder 31 is a cylindrical member, and is connected to the lower end of the power plant P by a bolt (not shown) inserted through the cylinder hole, whereby the first cylindrical part of the torque rod 1 is connected. The 21 side is connected to the power plant P.

  The second cylindrical portion 22 is formed so that the cylindrical hole is octagonal in a side view, and the second inner cylindrical body 4 is located at a substantially central position in the cylindrical hole. It is arrange | positioned so that it may become parallel with 31 cylinder axes. Thus, the second inner cylindrical body 4 and the second cylindrical portion 22 are connected by the rubber elastic body 5. Thus, in order to connect the 2nd inner cylinder 4 and the 2nd cylindrical part 22 with the rubber elastic body 5, what is necessary is just to carry out vulcanization integral molding, for example, specifically with respect to an injection mold. Then, after the bracket 2 is installed, the second inner cylindrical body 4 is installed inside the second cylindrical portion 22 of the bracket 2, and after the mold clamping, the second inner cylindrical body 4 and the second cylindrical portion 22 During this time, the unvulcanized rubber elastic body 5 may be injected and heated and vulcanized to vulcanize and bond the rubber elastic body 5 to the second inner cylindrical body 4 and the second cylindrical portion 22. Employing vulcanization integral molding eliminates the restriction that the shape of the cylindrical hole of the second cylindrical portion 22 must be a circular shape or an elliptical shape, and can increase the degree of freedom of the shape. Making the cylindrical hole shape of the second cylindrical portion 22 polygonal when viewed in the cylinder axial direction is advantageous for improving the tuning width of the spring characteristics, increasing the free length of the main spring, and diversifying the stopper shape. . Here, although the shape of the cylindrical hole of the second cylindrical portion 22 is an octagon, it is not limited to this and may be another polygonal shape.

  The second inner cylinder 4 is a cylindrical member, and is connected to the subframe F by a bolt or the like (not shown) inserted through the cylinder hole, whereby the second cylindrical portion 22 side of the torque rod 1 is connected to the subframe F. Connected to frame F. Thus, by connecting the first inner cylinder 31 to the power plant P and connecting the second inner cylinder 4 to the subframe F, the subframe F and the powerplant P connect the torque rod 1 to each other. Connected through.

  The rubber elastic body 5 is provided with the rubber elastic body 5 on both sides in the longitudinal direction of the vehicle body (in the direction perpendicular to the cylinder axis of the second inner cylinder body 4) with the second inner cylinder body 4 interposed therebetween. Through holes 51 and 52 penetrating in the cylinder axis direction (vehicle width direction) are formed. Thereby, the two main spring parts 53 and 53 extended in a substantially radial direction toward the 2nd cylindrical part 22 from the 2nd inner cylinder 4 are formed.

  The through hole 51 on the rear side of the vehicle body is provided with a stopper 54 made of a rubber elastic body protruding from the inner peripheral surface of the second cylindrical portion 22 toward the front of the vehicle body, while the through hole 52 on the front side of the vehicle body is provided in the through hole 52 on the front side of the vehicle body. A stopper 55 made of a rubber elastic body is provided along the inner peripheral surface of the second cylindrical portion 22. These stoppers 54 and 55 are provided so as to face the second inner cylinder 4 in the main load input direction with the second inner cylinder 4 interposed therebetween, in other words, in the longitudinal direction of the vehicle body.

  As will be described later, when the second inner cylinder 4 and the second cylindrical portion 22 are relatively displaced in the longitudinal direction of the vehicle body, the stopper 55 is the second inner cylinder 4 (more precisely, the portion of the elastic body surrounding it). In the following description, the second inner cylinder 4 and the elastic body portion surrounding the second inner cylinder 4 may be referred to as the second inner cylinder 4 side). (2) It has a function of regulating the relative displacement between the inner cylindrical body 4 and the second cylindrical portion 22 in the longitudinal direction of the vehicle body to a predetermined amount.

  Specifically, the stopper 55 is formed so as to face the second inner cylinder 4 on the front side of the vehicle body and to be flat in the vertical direction of the vehicle body, out of the inner circumferential surface of the octagonal second cylindrical portion 22. It is provided on the inner peripheral surface so as to extend over the installed portion 221 and two surfaces adjacent to the installed portion 221. The stopper 55 is continuous with the first guide portion 551 inclined so that the upper side is the rear side of the vehicle body and the lower side is the front side of the vehicle body, the lower end of the first guide portion 551, and the first guide portion 551. Has a second guide portion 552 that is inclined so that the upper side is the front side of the vehicle body and the lower side is the rear side of the vehicle body, so that the first inner side from the second inner cylindrical body 4 side. It is formed to be concave toward the cylindrical body 31.

  Thus, the stopper 55 is configured so that the first guide portion 551 and the second guide portion 552 connect the cylinder axis of the first inner cylindrical body 31 and the cylinder axis of the second cylindrical portion 22 in the longitudinal direction of the vehicle body. It is formed so as to be line symmetric with respect to a reference axis A extending in the direction. That is, the first guide portion 551 is inclined so as to move away from the cylindrical axis of the second cylindrical portion 22 as it approaches the reference axis A from the side (upper side) away from the reference axis A on the upper side across the reference axis A. On the other hand, the second guide portion 552 also has a cylinder of the second cylindrical portion 22 as it approaches the reference axis A from the side (lower side) away from the reference axis A on the lower side across the reference axis A. It inclines so that it may leave | separate from an axis | shaft, and it inclines in the reverse direction to the 1st guide part 551 by this. Thus, the first guide portion 551 and the second guide portion 552 are configured to be substantially V-shaped, and the reference axis A passes through the bottom of the V-shaped stopper 55.

  The torque rod 1 is configured as described above. Next, the function and effect of the torque rod 1 will be described.

  For example, when the automobile suddenly decelerates, a large driving reaction force causes a load to be input from the power plant P to the torque rod 1 through the first inner cylinder 31, and the bracket 2 moves to the rear of the vehicle body. Since the second inner cylinder 4 is fixed to the subframe F, the second inner cylinder 4 hardly moves, and as a result, the second cylindrical portion 22 and the second inner cylinder 4 are largely displaced in the longitudinal direction of the vehicle body. . Then, when the second inner cylinder body 4 relatively moves along the reference axis A and the second inner cylinder body 4 side and the stopper 55 come into contact with each other, the second inner cylinder body 4 side becomes V It contacts the bottom of the letter-shaped stopper 55. At this time, further relative movement between the second cylindrical portion 22 and the second inner cylindrical body 4 is restricted.

  On the other hand, when the load input to the torque rod 1 includes not only the main load input direction but also a component orthogonal to the main load input direction, the second inner cylinder 4 is displaced relative to the reference axis A. Thus, the second inner cylinder 4 side comes into contact with the first guide portion 551 or the second guide portion 552 of the stopper 55.

  Here, in the torque rod in which the installation portion 221 is formed so as to be flat in the vertical direction of the vehicle body, but the inclined first and second guide portions 551 and 552 are not provided, the second inner cylinder When the body 4 side comes into contact with the stopper 55 at a position shifted from the reference axis A, the bracket 2 can rotate around the first cylindrical portion 21 side. By providing the inclined first and second guide portions 551 and 552, when the second inner cylindrical body 4 side comes into contact with the first or second guide portions 551 and 552, the second along the inclination. The inner cylinder 4 side moves relative to the reference axis A, and finally the second inner cylinder 4 side is sandwiched between the first and second guide portions 551 and 552. It is located on the reference axis A. Thereby, the rotation of the bracket 2 is avoided.

Thus, according to the torque rod 1, when the second inner cylinder 4 side is displaced from the reference axis A and contacts the stopper 55, the first inner guide 551 and the second guide 552 cause the second inner cylinder. Since the position 4 is corrected so as to be the reference axis A, the rotation of the bracket 2 can be avoided. Accordingly, it is possible to prevent displacement exceeding a predetermined maximum stroke amount, and thus it is possible to reliably avoid the power plant P from interfering with other members in the engine room.
(Embodiment 2)
Next, the torque rod 101 according to the second embodiment of the present invention will be described.

  As shown in FIG. 3, the torque rod 101 according to the second embodiment is different from the first embodiment in the configuration of the second cylindrical portion and the stopper. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted as appropriate, and components different from those in the first embodiment will be mainly described.

  Unlike the torque rod 1 having the installation portion 221 that is a flat surface in the vertical direction shown in FIG. 2, the torque rod 101 has installation surfaces that are inclined on both the upper and lower sides across the reference axis A. Have.

  Specifically, the second cylindrical portion 24 is formed such that its cylindrical hole is heptagonal when viewed from the side, and the second inner cylinder is located within the inner peripheral surface of the heptagonal second cylindrical portion 24. The installation portion 241 composed of two surfaces facing the body 4 on the front side of the vehicle body has a first installation surface 241a inclined so that the upper side is the rear side of the vehicle body and the lower side is the front side of the vehicle body, and the first installation surface 241a. And a second installation surface 241b that is inclined in a direction opposite to the first installation surface 241a, that is, an upper side thereof is inclined to the front side of the vehicle body and a lower side thereof is set to the rear side of the vehicle body. Therefore, it is formed to be concave from the second inner cylinder 4 side toward the first inner cylinder 31.

  Thus, the installation portion 241 is configured such that the first installation surface 241a approaches the reference axis A from the side (upper side) away from the reference axis A on the upper side across the reference axis A. While the second installation portion 241b is inclined so as to be away from the cylinder axis, the second installation portion 241b also has a second side as it approaches the reference axis A from the side away from the reference axis A (lower side) with respect to the reference axis A. The first installation surface 241 a and the second installation surface 241 b are formed so as to be line-symmetric with respect to the reference axis A.

  The stopper 56 is provided on the first installation portion 241a so as to have a substantially constant thickness, so that the first inclination portion 561 is inclined in the same direction as the inclination direction of the first installation portion 241a. The second installation part 241b has a second inclined part 562 that is inclined in the same direction as the inclination direction of the second installation part 241b by being provided with a substantially constant thickness. ing. Accordingly, the stopper 56 is formed to be concave from the second inner cylinder 4 side toward the first inner cylinder 31.

  The torque rod 101 of the second embodiment is configured as described above. Next, the function and effect of the torque rod 101 will be described.

  When the load inputted to the torque rod 101 includes a component in the vertical direction, when the second inner cylinder 4 is displaced relative to the reference axis A, the second inner cylinder 4 side is The stopper 56 contacts the first inclined portion 561 or the second inclined portion 562.

  At this time, since the first installation surface 241a and the second installation surface 241b of the installation part 241 are inclined in the vertical direction, the second inner cylinder 4 side is the same as the torque rod 1 shown in FIG. Then, relative movement is made toward the reference axis A along the first installation surface 241a (first inclined portion 561 of the stopper) or the second installation surface 241b (second inclined portion 562), and finally the second The inner cylinder 4 side is positioned on the reference axis A so as to be sandwiched between the first inclined portion 561 and the second inclined portion 562. As a result, also in this torque rod 101, it can avoid that the bracket 2 rotates, and can prevent displacement exceeding the predetermined maximum stroke amount. When the torque rod 1 shown in FIG. 2 and the torque rod 101 shown in FIG. 3 are compared, in the torque rod 1 shown in FIG. 2, the stopper 55 made of a rubber elastic body connects the first and second guide portions 551 and 552. However, the inclination of the mounting surfaces 241a and 241b is not deformed in the torque rod 101 shown in FIG. The anti-rotation function of 2 becomes higher.

As described above, in the torque rod according to the embodiment, when the second inner cylinder side is displaced from the reference axis and contacts the stopper, the position of the second inner cylinder is corrected to be on the reference axis. Therefore, it is possible to avoid the bracket from rotating and reliably prevent displacement beyond the maximum stroke amount.
<< Other Embodiments >>
The present invention may be configured as follows with respect to the embodiment.

  That is, in the said embodiment, although the 2nd inner cylinder is made into the cylindrical member, it is not restricted to this, For example, you may make it an elliptical cylindrical member.

  Moreover, although the 1st guide part and the 2nd guide part (or 1st inclination part and 2nd inclination part) are formed so that it may become symmetrical with respect to a reference line, it is not restricted to this, For example, 1st guidance You may form so that the inclination angle of a part and the inclination angle of a 2nd guide part may differ. The first guide part and the second guide part do not have to be formed to extend to the reference line. For example, the first guide part and the second guide part are provided at the position on the reference line in the stopper, and the first and second guides are provided at the opening edge of the recess part. You may form so that a guide part may continue.

  Further, since the rotation of the bracket is likely to occur at the time of deceleration, the torque rod according to the embodiment includes a stopper having a first guide portion and a second guide portion (or a first inclined portion and a second inclined portion), Although provided on the front side of the vehicle body with respect to the second inner cylinder, it may be provided on the rear side of the vehicle body in order to obtain the same effect as described above during acceleration, or the same as described above in both acceleration and deceleration. In order to obtain an effect, it may be provided on both the front and rear sides of the vehicle body.

  Since the vibration isolator of the present invention can avoid the rotation of the bracket after the second inner cylinder side comes into contact with the stopper, it is applied as a torque rod of a power plant supported by a pendulum mount system, for example. This is useful in that the power plant can reliably avoid interference with other members in the engine room.

1,101 Torque rod (anti-vibration device)
2 Bracket 21 1st cylindrical part 22,24 2nd cylindrical part 221,241 installation part 241a 1st installation surface 241b 2nd installation surface 23 connection part 31 1st inner cylinder 4 2nd inner cylinder 5 Rubber elastic body 55, 56 Stopper 551 1st guide part 552 2nd guide part 561 1st inclined part 562 2nd inclined part A Reference axis F Subframe (vehicle body)
P Power plant (supported body)

Claims (3)

A vibration isolator for connecting a supported body and a vehicle body,
A first tubular portion disposed on the supported body side, a second tubular portion disposed on the vehicle body side with an interval in the main load input direction with respect to the first tubular portion, and the first A bracket having a cylindrical portion and a connecting portion that connects the second cylindrical portion;
A first inner cylinder disposed in the cylindrical hole of the first cylindrical portion and elastically connected to the first cylindrical portion and connected to the supported body;
A second inner cylinder disposed in the cylinder hole of the second cylindrical portion so as to be parallel to the cylinder axis of the first inner cylinder, and connected to the vehicle body;
A rubber elastic body connecting the second cylindrical portion and the second inner cylindrical body;
Of the inner peripheral surface of the second cylindrical portion, the second cylindrical shape is provided in an installation portion which is a portion opposed to the second inner cylindrical body in the main load input direction, and a load is input. A stopper that regulates the relative displacement by contacting the second inner cylinder when the portion and the second inner cylinder are relatively displaced in the main load input direction,
The stopper is orthogonal to the main load input direction across a reference axis extending in the main load input direction so as to connect the cylinder axis of the first inner cylinder and the cylinder axis of the second cylindrical portion. On one side of the direction, the first guide part inclined with respect to the orthogonal direction so as to move away from the cylinder axis of the second cylindrical part as approaching the reference axis from the side away from the reference axis; On the other side of the orthogonal direction across the reference axis, it has a second guide part inclined with respect to the orthogonal direction in the opposite direction to the first guide part,
When the second inner cylinder side comes into contact with the first guide part or the second guide part of the stopper by the input load, the second inner cylinder side is brought into contact with the first guide part or the second guide part. An anti-vibration device configured to move relative to the reference axis along the axis. A vibration isolator for connecting a supported body and a vehicle body,
A first tubular portion disposed on the supported body side, a second tubular portion disposed on the vehicle body side with an interval in the main load input direction with respect to the first tubular portion, and the first A bracket having a cylindrical portion and a connecting portion that connects the second cylindrical portion;
A first inner cylinder disposed in the cylindrical hole of the first cylindrical portion and elastically connected to the first cylindrical portion and connected to the supported body;
A second inner cylinder disposed in the cylinder hole of the second cylindrical portion so as to be parallel to the cylinder axis of the first inner cylinder, and connected to the vehicle body;
A rubber elastic body connecting the second cylindrical portion and the second inner cylindrical body;
Of the inner peripheral surface of the second cylindrical portion, the second cylindrical shape is provided in an installation portion which is a portion opposed to the second inner cylindrical body in the main load input direction, and a load is input. A stopper that regulates the relative displacement by contacting the second inner cylinder when the portion and the second inner cylinder are relatively displaced in the main load input direction,
The installation portion is orthogonal to the main load input direction with a reference axis extending in the main load input direction so as to connect the cylinder axis of the first inner cylinder and the cylinder axis of the second cylindrical portion. On the one side in the orthogonal direction, a first installation surface that is inclined with respect to the orthogonal direction so as to move away from the cylinder axis of the second cylindrical portion as it approaches the reference axis from the side away from the reference axis; On the other side of the orthogonal direction across the reference axis, it has a second installation surface that is inclined with respect to the orthogonal direction in a direction opposite to the first installation surface,
The stopper is provided along the first installation surface and the second installation surface,
When the second inner cylinder side comes into contact with the stopper by the input load, the second inner cylinder side is relatively moved so as to approach the reference axis along the first installation surface or the second installation surface. An anti-vibration device configured to move. In the vibration isolator according to claim 1 or 2,
The vibration isolator, wherein the second inner cylindrical body, the second cylindrical portion, and the rubber elastic body are integrally formed by vulcanization.

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