JP2014088914A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an abrupt increase in spring constant while fixing a stopper plate to a cylindrical part without welding.SOLUTION: A first stopper part 12 comprises a stopper body part 52 made of a rubber elastic body projecting from a part, opposed to the first cylindrical part 10 in a main load input direction, of an inner peripheral surface of a first cylindrical part 3 toward a first inner cylinder body 10, and a stopper plate 13 which is buried in the stopper body part 52 and has both ends opposed to the opposite side from the first inner cylinder body 10 in the main load input direction. At both the ends of the stopper plate 13, insertion plate parts 13a are formed respectively which extend to the opposite side from the first inner cylinder body 10 in the main load input direction. An insertion hole 30 is formed in a part, opposed to each insertion plate part 13 a, of the first cylindrical part 3. Each insertion plate part 13a is inserted into each insertion hole 30 with a gap left with the insertion hole 30, and elastically supported in the insertion hole 30.

Description

  The present invention provides an outer member having a tubular portion, an inner tubular body disposed in the tubular portion and connected to an inner peripheral surface of the tubular portion via an elastic member, and the tubular portion. And a stopper for restricting a relative displacement amount of the inner cylindrical body in the main load input direction with respect to the outer member.

  An outer member having a cylindrical part, an inner cylinder disposed in the cylindrical part and connected to an inner peripheral surface of the cylindrical part via an elastic member, and provided in the cylindrical part, with respect to the outer member An anti-vibration device including a stopper portion that regulates the relative displacement amount of the inner cylinder in the main load input direction is known as a conventional technique.

  For example, a torque rod as an anti-vibration device shown in Patent Literature 1 includes a rod body as an outer member having first and second cylindrical portions arranged at intervals in the main load input direction, and the first A first inner cylinder disposed in the cylindrical portion and connected to an inner peripheral surface of the first cylindrical portion via a first elastic member; and a second inner cylinder disposed in the second cylindrical portion. A second inner cylindrical body connected to the inner peripheral surface of the cylindrical portion via a second elastic member, and a relative displacement amount of the first inner cylindrical body in the main load input direction with respect to the rod body provided in the first cylindrical portion. And a stopper portion for restricting. The first elastic member is integrally formed on the inner peripheral surface of the first cylindrical portion and the outer peripheral surface of the first inner cylindrical body, and the stopper portion is a main load among the inner peripheral surfaces of the first cylindrical portion. From a stopper main body portion that bulges the portion facing the first inner cylindrical body in the input direction radially inward of the first cylindrical portion, and an elastic body disposed on the distal end surface of the stopper main body portion And a stopper elastic portion.

JP 2012-97878 A

  By the way, in the torque rod shown in the above-mentioned Patent Document 1, when the rod body is made of aluminum die cast, the rod body becomes light, and thus there is a problem that gear noise and in-car noise are likely to occur.

  In order to solve this problem, as shown in FIG. 7, it is conceivable that the rod body “a” is made of an iron sheet metal. In this torque rod b, the stopper part c is constituted by a stopper main body part d made of an elastic body and a stopper plate e embedded in the stopper main body part d. The stopper plate e is welded to the inner peripheral surface of the first tubular portion f because the rod body a is made of sheet metal and cannot be integrally formed with the rod body a.

However, in the torque rod b shown in FIG. 7, the stopper plate e is welded to the first tubular portion f, so that there is a problem that the rubber adhesiveness is deteriorated. Moreover, in order to avoid this weld part g, the thickness of the stopper main body part d becomes large, and the free length of the main spring part h becomes short with this, and there exists a subject that durability performance falls.
Further, when the relative displacement amount of the first inner cylinder i in the main load input direction becomes equal to or larger than the set amount, the first inner cylinder i comes into contact with the stopper main body d, and the stopper main body d is connected to the first inner cylinder. It is sandwiched between the body i and the first tubular part f and is compressed and deformed. At this time, since the stopper plate e is welded to the first tubular portion f, there is also a problem that the spring constant rapidly increases.

  This invention is made in view of this point, and the place made into the subject exists in suppressing a rapid raise of a spring constant, fixing a stopper plate to a cylindrical part, without using welding. .

  In order to solve the above-described problems, the present invention is configured to insert the insertion portion of the stopper plate into the insertion hole of the cylindrical portion with a gap between the insertion hole and elastic support in each insertion hole. It is characterized by that.

  Specifically, the present invention includes an outer member having a tubular portion, an inner tubular body disposed in the tubular portion and connected to an inner peripheral surface of the tubular portion via an elastic member, The following solution was taken for an anti-vibration device provided in the cylindrical portion and provided with a stopper portion that regulates the relative displacement amount of the inner cylindrical body in the main load input direction with respect to the outer member.

  That is, according to a first aspect of the present invention, the outer member is made of sheet metal, and the stopper portion is formed from a portion of the inner peripheral surface of the cylindrical portion facing the inner cylindrical body in the main load input direction. A stopper main body made of an elastic body projecting to the body side, and a stopper plate embedded in the stopper main body, with both end portions facing away from the inner cylindrical body in the main load input direction. Insertion portions extending on the opposite side to the inner cylindrical body in the main load input direction are respectively formed at both ends of the cylindrical portion, and insertion holes are formed in portions facing the insertion portions in the cylindrical portion, respectively. The insertion portions are inserted into the insertion holes in a state where a gap is provided between the insertion holes and elastically supported by the insertion holes.

  According to this, the insertion part extending to the opposite side to the inner cylinder in the main load input direction is formed at both ends of the stopper plate, respectively, and the insertion hole is formed in the part facing each insertion part in the cylindrical part. Since each insertion portion is inserted into each insertion hole with a gap between each insertion hole and elastically supported in each insertion hole, the stopper plate is not welded to the cylindrical portion. Can be fixed to. As a result, there is no problem that the rubber adhesiveness is deteriorated or the free length of the main spring portion is shortened and the durability performance is lowered.

  Further, since each insertion portion is inserted into each insertion hole with a gap between the insertion holes and elastically supported in each insertion hole, when the stopper main body portion is compressed and deformed, The stopper plate is displaced relative to the outer member in the main load input direction. Thereby, a rapid increase in the spring constant can be suppressed.

  According to a second aspect, in the first aspect, a through-hole penetrating in the axial direction of the cylindrical portion is formed in a portion of the stopper main body portion between the cylindrical portion and the stopper plate. It is what.

  According to this, since the through hole penetrating in the axial direction of the cylindrical portion is formed in the portion between the cylindrical portion and the stopper plate in the stopper main body portion, the spring constant can be reduced.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the outer member is a rod body having first and second cylindrical portions that are spaced from each other in the main load input direction. An inner cylinder is disposed in the first cylindrical part, and is connected to an inner peripheral surface of the first cylindrical part via a first elastic member, and in the second cylindrical part. And a second inner cylindrical body connected to the inner peripheral surface of the second cylindrical portion via a second elastic member, and the stopper portion is provided in the first cylindrical portion. Restricting a relative displacement amount of the first inner cylindrical body in the main load input direction with respect to the rod main body, and the stopper main body portion of the inner peripheral surface of the first cylindrical portion in the main load input direction. The stopper plate protrudes from the portion facing the inner cylinder toward the first inner cylinder, and both ends of the stopper plate are in the main load input direction. Orientation on the opposite side of the Oite said first inner cylinder, each through hole is being formed respectively in a portion opposed to the respective insertion portions in the first tubular portion.

  According to this, this invention is applicable to the torque rod as a vibration isolator.

  According to the present invention, the insertion portions extending to the opposite side of the inner cylindrical body in the main load input direction are formed at both ends of the stopper plate, and the insertion holes are formed in the portions facing the respective insertion portions in the cylindrical portion. Since each insertion portion is inserted into each insertion hole with a gap between each insertion hole and elastically supported in each insertion hole, the stopper plate is welded to the cylindrical portion. In addition, there is no problem that the rubber adhesion deteriorates or the free length of the main spring part becomes shorter and the durability performance deteriorates, and the stopper body part is compressed and deformed. Then, the stopper plate can suppress a rapid increase in the spring constant by being relatively displaced in the main load input direction with respect to the outer member.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle engine mount system provided with a torque rod as a vibration isolator according to Embodiment 1 of the present invention, as viewed from an obliquely upper side behind the vehicle. It is a figure which shows the torque rod of Embodiment 1, (a) is a perspective view, (b) is the side view seen from the cylinder axial direction of the 1st cylindrical part. It is a figure which shows the torque rod of Embodiment 1 in the state except the 1st-3rd elastic member, (a) is a perspective view, (b) is the side view seen from the cylinder axial direction of the 1st cylindrical part, (C) is the front view seen from the main load input direction. It is a figure which shows the stopper plate of Embodiment 1, (a) is a perspective view, (b) is the side view seen from the cylinder axial direction of the 1st cylindrical part. It is a graph which shows the outline of the displacement-load characteristic curve of a torque rod. It is a figure which shows the torque rod of Embodiment 2, (a) is a perspective view, (b) is the side view seen from the cylinder axial direction of the 1st cylindrical part. It is the side view which looked at the conventional torque rod from the cylinder axis direction of the 1st cylindrical part.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

(Embodiment 1)
FIG. 1 shows an engine mount system for a vehicle provided with a torque rod 1 as a vibration isolator according to Embodiment 1 of the present invention. 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 mount system, when a large driving reaction force is applied, for example, when the vehicle is suddenly accelerated or decelerated, the power plant P tends to swing greatly in the longitudinal direction of the vehicle body like a pendulum. Such shaking in the longitudinal direction of the vehicle body is restricted by connecting the lower end portion of the power plant P and the vehicle subframe F located behind the vehicle body of the power plant P via the torque rod 1. Thus, the torque rod 1 according to the present embodiment is mainly input with the load in the vehicle longitudinal direction.

  As shown in FIGS. 2 and 3, the torque rod 1 has a rod main body 2 (first and second cylindrical portions 3 and 4) arranged at intervals in the main load input direction (that is, the vehicle longitudinal direction). An outer member), a first inner cylindrical body 10 disposed in the first cylindrical portion 3 and connected to an inner peripheral surface of the first cylindrical portion 3 via a first elastic member 5; 2nd which is arrange | positioned in the 2 cylindrical part 4, is attached to the power plant P (other to-be-connected member), and is connected to the internal peripheral surface of this 2nd cylindrical part 4 via the 2nd elastic member 6. An inner cylinder 11 and a third elastic member 7 that covers the outer peripheral surface of the rod body 2 and both end surfaces of the cylindrical portions 3 and 4 in the cylinder axis direction are provided. Thus, by covering the rod body 2 with the third elastic member 7, it is possible to avoid applying the anticorrosive paint to the rod body 2.

  The rod body 2 is composed of two iron sheet metals 2a and 2b so that the overall shape is bowl-shaped, and is arranged so that the longitudinal direction thereof coincides with the vehicle longitudinal direction. The first cylindrical portion 3 and the second cylindrical portion 4 are formed at both ends in the longitudinal direction of the rod body 2 and are connected to each other via a pair of connecting plate portions 8. The two metal plates 2a and 2b overlap each other at the end on the first tubular portion 3 side in the longitudinal direction of the rod body 2, whereas they are abutted against each other at the end on the second tubular portion 4 side. Yes. Thus, the strength of the end of the rod body 2 on the first tubular portion 3 side in the longitudinal direction can be increased by overlapping the two metal plates 2a and 2b. A connecting cylinder 9 is disposed between the connecting plate portions 8 so as to fit between them. The connecting cylinder 9 is composed of two sheets of metal so that the overall shape is rectangular, and is arranged so that the long side direction coincides with the vehicle front-rear direction. Thus, by arranging the connecting cylinder 9 between the connecting plate portions 8, the strength of the connecting portion between the first cylindrical portion 3 and the second cylindrical portion 4 can be increased.

  The 1st cylindrical part 3 and the 2nd cylindrical part 4 are arrange | positioned so that a cylindrical hole may open in the same direction. The second cylindrical portion 4 is formed in a substantially circular shape when viewed from the cylindrical axis direction, whereas the first cylindrical portion 3 has an outer shape when viewed from the cylindrical axis direction. It is formed into a polygonal cylindrical shape. The first tubular portion 3 has a relatively large tubular hole as compared to the second tubular portion 4. A stopper main body 52, which will be described later, is formed on the inner peripheral surface of the first cylindrical portion 3 on the rear side of the vehicle. The stopper main body 52 is formed of a rubber elastic body.

  The first inner cylinder 10 and the second inner cylinder 11 are made of a cylindrical metal member. Both the inner cylinders 10 and 11 are arranged in parallel to each other, and the rod body 2 has the first inner cylinder 10 in the side view of the rod (that is, viewed from the cylinder axis direction of the first cylindrical portion 3). Are symmetrical with respect to a straight line C passing through the axis of the second inner cylinder 11 and the axis of the second inner cylinder 11.

  The first inner cylinder 10 is disposed at a position slightly offset to the second inner cylinder 11 side (vehicle front side) from the center position in the main load input direction in the first cylindrical portion 3. The first inner cylinder 10 is elastically connected to the inner peripheral surface of the first cylindrical portion 3 through the first elastic member 5 as described above. The first inner cylinder 10 is connected to the subframe F by a bolt (not shown) inserted through the cylinder hole, whereby the first cylindrical portion 3 side of the torque rod 1 is connected to the subframe F.

  The first elastic member 5 is composed of a rubber elastic body. The first elastic member 5 includes a pair of elastic arm portions 50 extending radially outward from the first inner cylindrical body 10 and a frame-like portion covering the inner peripheral surface of the first cylindrical portion 3 in a thin skin shape over the entire circumference. 51. The frame-like portion 51 includes a rubber stopper main body 52 that constitutes a part of the first stopper portion 12 and a rubber-made rubber positioned on the opposite side of the first stopper portion 12 with the first inner cylinder 10 interposed therebetween. The second stopper portion 53 is integrally formed.

  The pair of elastic arm portions 50 are arranged symmetrically with respect to the straight line C so as to be substantially V-shaped in a side view of the rod. More specifically, each elastic arm portion 50 has a main load input direction with respect to a direction orthogonal to the main load input direction (vehicle longitudinal direction) from the outer peripheral surface of the first inner cylinder 10 toward the radially outer side. It extends so as to incline toward one side (rear side of the vehicle) and is connected to the inner peripheral surface of the first cylindrical portion 3. Thus, the spring constant of each elastic arm part 50 can be raised by extending each elastic arm part 50 in the direction inclined with respect to the direction orthogonal to the main load input direction. Further, it is possible to increase the length of each elastic arm portion 50 in the extending direction and improve its durability. The pair of elastic arm portions 50 function as a main spring portion that absorbs vibration input to the torque rod 1.

  The first elastic member 5 is integrally formed with the first inner cylindrical body 10 and the first cylindrical portion 3 by vulcanization molding. Specifically, after the rod main body 2 is installed with respect to the injection mold, the first inner cylindrical body 10 is placed inside the first cylindrical portion 3 of the rod main body 2, and the second cylindrical portion 4. The second inner cylinder 11 is set inside, and after clamping, the cavity of the injection mold (between the first inner cylinder 10 and the first cylindrical portion 3 and the second inner cylinder 11 and the second The rod body 2 and the first to third elastic members 5 to 7 are integrated by vulcanization adhesion by injecting an unvulcanized rubber elastic body between the cylindrical portion 4 and the like and heating and vulcanizing. Has been. Thereby, the 1st inner cylinder 10, the 1st elastic member 5, and the 1st cylindrical part 3 are integrated by vulcanization adhesion. By adopting vulcanization integral molding in this way, for example, the degree of freedom of shape of the first cylindrical portion 3 is increased compared to the case where a bush type vulcanized molded product is press-fitted into the first cylindrical portion 3. Can do. Therefore, the shape of the first cylindrical portion 3 is not limited to a cylindrical shape, and can be a relatively complicated shape as in this embodiment. Furthermore, the manufacturing cost can be reduced by omitting the outer cylinder, which is necessary when the bush press-fitting method is adopted.

  The second inner cylindrical body 11 is coaxially disposed in the second cylindrical portion 4 and is connected to the inner peripheral surface of the second cylindrical portion 4 via the second elastic member 6 as described above. Yes. The second elastic member 6 is formed over the entire circumference so as to surround the outer peripheral surface of the second inner cylindrical body 11. Similarly to the first elastic member 5, the second elastic member 6 in the second cylindrical portion 4 is also integrally formed with the second inner cylindrical body 11 and the second cylindrical portion 4 by vulcanization joining. The second cylindrical portion 4 is not limited to vulcanized integral molding of a rubber elastic body. For example, a method of press-fitting a bush type vulcanized molded product may be adopted.

  The second inner cylindrical body 11 is connected to the lower end portion of the power plant P by a bolt (not shown) inserted through the cylindrical hole, whereby the second cylindrical portion side of the torque rod 1 is connected to the power plant P. The Thus, when the first inner cylinder 10 is connected to the subframe F and the second inner cylinder 11 is connected to the power plant P, the subframe F and the power plant P connect the torque rod 1 to each other. Connected through.

  The third elastic member 7 is composed of a rubber elastic body. The third elastic member 7 has a thick portion on one side (vehicle rear side portion) facing the first inner cylinder 10 in the main load input direction (vehicle longitudinal direction) of the outer peripheral surface of the first cylindrical portion 3. Thick wall portion 70 that covers the wall, a first cover portion 71 that covers the outer peripheral surface of the first cylindrical portion 3 other than the rear portion of the vehicle in a thin skin shape, and an insertion hole through which the insertion plate portion 13a is inserted. 30 (the insertion plate portion 13a and the insertion hole 30 will be described later), a second covering portion 73 covering the outer peripheral surface of the second tubular portion 4 in a thin skin shape over the entire circumference, and a rod A third covering portion 74 that covers both end surfaces of the first and second cylindrical portions 3 and 4 of the main body 2 in the cylindrical axis direction in a thin skin shape, and a connecting cylindrical body 9 disposed between both connecting plate portions 8. It has the 2nd closing part 75 which closes the clearance gap between these both connection board parts 8 so that it may embed. The thick portion 70 is connected to the stopper main body 52 via the first closing portion 72. A second stopper portion 53 is integrally formed in a portion (a vehicle rear side portion) of the second closing portion 72 that faces the first inner cylinder 10 in the main load input direction (vehicle longitudinal direction). The third elastic member 7 is also integrally formed with the rod body 2 by vulcanization joining, similarly to the first and second elastic members 5 and 6. The third elastic member 7 is also integrally formed with the first and second elastic members 5 and 6.

  The first stopper portion 12 provided in the first cylindrical portion 3 regulates the amount of relative displacement of the first inner cylindrical body 10 relative to the rod body 2 toward the vehicle rear side during vehicle acceleration, for example. Of the inner peripheral surface of the one cylindrical portion 3, from the one side portion (the vehicle rear side portion) facing the first inner cylinder body 10 in the main load input direction (vehicle longitudinal direction) to the first inner cylinder body 10 side. A stopper main body 52 made of a protruding rubber elastic body, and embedded in the stopper main body 52, both end portions in the length direction are opposite to the first inner cylinder 10 in the main load input direction (rear side of the vehicle). It is comprised with the stopper plate 13 which faces. The second stopper portion 53 restricts the amount of relative displacement of the first inner cylinder 10 with respect to the rod body 2 toward the vehicle front side when the vehicle is decelerated, for example, and is composed only of a rubber elastic body.

  The stopper main body 52 is formed in a substantially trapezoidal shape that gradually widens toward the rear side of the vehicle in a side view of the rod. The distal end surface of the stopper main body 52 is formed in a curved surface shape in which the central portion in the direction orthogonal to the main load input direction (vehicle longitudinal direction) protrudes toward the first inner cylinder 10 side from both ends.

  The stopper plate 13 is formed in a substantially M shape when viewed from the side of the rod. As shown in FIG. 4, the first inner cylinder 10 in the main load input direction (vehicle front-rear direction) is provided at the center in the cylinder axial direction of the first cylindrical portion 3 at both ends in the length direction of the stopper plate 13. Insertion plate portions 13a (insertion portions) are integrally formed as legs extending to the opposite side (rear side of the vehicle). Each insertion plate part 13a is formed in a substantially rectangular shape. The length of the first cylindrical portion 3 in each insertion plate portion 13a in the cylinder axis direction is shorter than the length of the first cylindrical portion 3 in the stopper plate 13 in the cylinder axis direction. The upper insertion plate portion 13a is shorter in the vehicle front-rear direction than the lower insertion plate portion 13a.

  Insertion holes 30 penetrating in the thickness direction are formed in portions of the first tubular portion 3 facing the respective insertion plate portions 13a. More specifically, one insertion hole 30 is formed in a portion other than the overlapping portion in one sheet metal 2 a constituting the rod body 2, whereas the other insertion hole 30 constitutes the rod body 2. The other sheet metal 2b is formed at a portion other than the overlapping portion. Each insertion hole 30 is formed in a substantially rectangular shape. The length of the first cylindrical portion 3 in the insertion hole 30 in the cylinder axis direction is longer than the length of the first cylindrical portion 3 in the insertion plate portion 13a in the cylinder axis direction. Although the length of the insertion hole 30 is determined according to desired stopper characteristics, it is preferably 3 mm or more longer than the length of the insertion plate portion 13a in terms of rubber moldability. The width of the first cylindrical portion 3 in the insertion hole 30 in the direction perpendicular to the cylinder axis direction (the direction perpendicular to the main load input direction) is the thickness of the insertion plate portion 13a in the direction perpendicular to the cylinder axis direction of the first cylindrical portion 3. Bigger than. The width of the insertion hole 30 is determined according to desired stopper characteristics, but is preferably 3 mm or more larger than the thickness of the insertion plate portion 13a in terms of rubber moldability.

  Each insertion plate portion 13 a is inserted into each insertion hole 30 with a gap between the insertion holes 30, and is elastically supported in each insertion hole 30 via a first rubber closing portion 72. ing. The gap between the insertion plate portion 13a and the insertion hole 30 is preferably 1.5 mm or more over the entire circumference in terms of rubber moldability. The distal end portion of the insertion plate portion 13 a protrudes from the insertion hole 30 toward the vehicle rear side and is embedded in the thick portion 70 of the third elastic member 7.

  2 is a first straight portion penetrating in the cylinder axis direction of the first cylindrical portion 3 disposed on the vehicle front side of the first inner cylindrical body 10, and 15 is the first inner cylindrical body 10. It is the 2nd straight part which penetrates in the cylinder axis direction of the 1st cylindrical part 3 arrange | positioned by the vehicle rear side.

  Next, the operation of the torque rod 1 will be described. For example, when the vehicle is decelerated, a load directed to the rear side of the vehicle is input to the torque rod 1 through the second inner cylinder 11, and the rod body 2 is displaced to the rear side of the vehicle together with the second inner cylinder 11. Since the first inner cylinder 10 is fixed to the subframe F, the first inner cylinder 10 hardly moves, and as a result, the first inner cylinder 10 is displaced relative to the rod body 2 toward the vehicle front side. This relative displacement amount is regulated by the second stopper portion 53.

  On the other hand, when the vehicle is accelerated, the power plant P is swung to the front side of the vehicle by the inertial force. Therefore, a load directed to the front side of the vehicle is input to the torque rod 1 through the second inner cylindrical body 11, and the rod body 2 11 and the front side of the vehicle. Since the first inner cylinder 10 is fixed to the sub-frame F, it hardly moves, and as a result, the first inner cylinder 10 is displaced relative to the rod body 2 toward the rear side of the vehicle. When the relative displacement amount is less than a preset set amount d1 (see FIG. 5), there is a gap between the first inner cylinder 10 and the first stopper portion 12, and the first inner cylinder The body 10 is displaced to the vehicle rear side while being supported by the pair of elastic arm portions 50 with respect to the rod body 2. When the relative displacement amount of the first inner cylindrical body 10 is equal to or larger than the set amount d1, the first inner cylindrical body 10 comes into contact with the stopper main body 52, and the stopper main body 52 is connected to the first inner cylindrical body 10 and the first inner cylindrical body 10. It is sandwiched between one cylindrical part 3 and is compressed and deformed. At this time, the insertion plate portion 13a is inserted into the insertion hole 30 with a gap between the insertion hole 30 and elastically supported by the insertion hole 30 as described above. When 52 is compressed and deformed, the stopper plate 13 is displaced relative to the rod body 2 toward the rear side of the vehicle. In this way, the first stopper portion 12 prevents the first inner cylinder 10 from being excessively displaced toward the vehicle rear side.

-Effect-
As described above, according to the present embodiment, the insertion plate portions 13a extending on the opposite side to the first inner cylindrical body 10 in the main load input direction are formed at both ends in the length direction of the stopper plate 13, respectively. Insertion holes 30 are respectively formed in portions of the portion 3 facing the insertion plate portions 13a, and the insertion plate portions 13a are inserted into the insertion holes 30 with a gap between the insertion holes 30. Since each insertion hole 30 is elastically supported, the stopper plate 13 can be fixed to the first cylindrical portion 3 without using welding. As a result, there is no problem that the rubber adhesiveness is deteriorated or the free length of the elastic arm portion 50 as the main spring portion is shortened and the durability performance is lowered.

Further, since each insertion plate portion 13a is inserted into each insertion hole 30 with a gap between each insertion hole 30 and elastically supported in each insertion hole 30, the stopper main body portion 52 is When being compressed and deformed, the stopper plate 13 is displaced relative to the rod body 2 in the main load input direction. Thereby, a rapid increase in the spring constant can be suppressed.
More specifically, as shown by the two-dot chain line in FIG. 5, the displacement-load characteristic of the conventional torque rod 1 is that of the elastic arm portion in the region where the relative displacement amount of the first inner cylinder is less than the set amount d1. According to the spring characteristics, the input load (input load to the rod body) increases linearly in proportion to the displacement of the first inner cylinder, while the relative displacement of the first inner cylinder is set. In the region of the amount d1 or more, the non-linear characteristic in which the spring constant rises rapidly and the slope of the graph rises steeply is shown.

  On the other hand, in the torque rod 1 of the above embodiment, the insertion plate portion 13 a is inserted into the insertion hole 30 with a gap between the insertion hole 30 and elastically supported by the insertion hole 30. As a result, the stopper plate 13 can be displaced relative to the rod body 2 toward the rear of the vehicle, and a rapid increase in the spring constant at the initial stage of stopper operation (section L in FIG. 5) can be suppressed. As a result, it is possible to reduce the NVH of the vehicle in the initial stage of the stopper operation.

  Furthermore, since the relative displacement of the stopper plate 13 in the direction other than the main load input direction with respect to the rod body 2 is restricted by the insertion hole 30, the spring constant in the direction other than the main load input direction can be increased.

(Embodiment 2)
The present embodiment is different from the first embodiment in that a straight portion 52a is formed on the stopper main body 52, but the other points are the same as those in the first embodiment. Therefore, in the following description, the same components as those of the first embodiment will be described using the same reference numerals.

  As shown in FIG. 6, a third straight portion 52 a penetrating in the cylinder axis direction of the first cylindrical portion 3 is formed in a portion of the stopper main body 52 between the first cylindrical portion 3 and the stopper plate 13. Has been. The third curb portion 52 a is formed in a substantially U shape so as to follow the stopper plate 13. The width of the third curb portion 52a in the main load input direction is determined according to a desired stroke end.

-Effect-
As described above, according to the present embodiment, the same operational effects as those of the first embodiment can be obtained.
Further, a third straight portion 52a as a through hole penetrating in the cylinder axis direction of the first cylindrical portion 3 is formed in a portion between the first cylindrical portion 3 and the stopper plate 13 in the stopper main body 52. Therefore, the spring constant can be reduced.

(Other embodiments)
In each of the above embodiments, the present invention is applied to the torque rod 1, but the present invention is not limited thereto. For example, the outer cylinder and the outer cylinder are provided with an elastic member on the inner peripheral surface of the outer cylinder. May be applied to a rubber bush provided with an inner cylindrical body connected via the outer cylindrical body and a stopper portion that is provided in the outer cylindrical body and restricts a relative displacement amount of the inner cylindrical body in the main load input direction with respect to the outer cylindrical body. .

  Further, in each of the above embodiments, the two metal plates 2a and 2b are overlapped with each other at the end of the rod body 2 on the first cylindrical portion 3 side in the longitudinal direction, but may be abutted with each other.

Furthermore, in each said embodiment, although the rod main body 2 was comprised with two sheet metal 2a, 2b, you may comprise with one sheet or 3 or more sheet metals.
Moreover, in each said embodiment, although the stopper plate 13 was formed in the substantially M shape, you may form not only in this but in a substantially U shape or a substantially trapezoid shape, for example.
Furthermore, in each said embodiment, although the connection cylinder 9 was arrange | positioned between both the connection board parts 8, not only this but a solid body may be arrange | positioned at the point of intensity | strength.

  As described above, the vibration isolator according to the present invention is applied to applications that need to suppress a rapid increase in the spring constant while fixing the stopper plate to the cylindrical portion without using welding. Can do.

1 Torque rod (anti-vibration device)
2 Rod body (outer member)
3 1st cylindrical part 30 Insertion hole 4 2nd cylindrical part
5 First elastic member
52 Stopper body
6 Second elastic member
7 Third elastic member
10 first inner cylinder
11 Second inner cylinder
12 First stopper
13 Stopper plate
13a Insertion plate part (insertion part)

Claims (3)

An outer member having a cylindrical part, an inner cylinder disposed in the cylindrical part and connected to an inner peripheral surface of the cylindrical part via an elastic member, and provided in the cylindrical part, the outer part A vibration isolator including a stopper portion that regulates a relative displacement amount in a main load input direction of the inner cylindrical body with respect to a member,
The outer member is made of sheet metal,
The stopper portion includes a stopper main body portion formed of an elastic body protruding toward the inner cylinder body from a portion facing the inner cylinder body in the main load input direction on the inner peripheral surface of the cylindrical portion; Embedded in the both ends of the main load input direction facing the opposite side of the inner cylinder body, and a stopper plate,
At both ends of the stopper plate, there are formed insertion portions that extend to the opposite side of the inner cylindrical body in the main load input direction, respectively.
Insertion holes are respectively formed in portions facing the respective insertion portions in the cylindrical portion,
The anti-vibration device according to claim 1, wherein each of the insertion portions is inserted into each of the insertion holes with a gap between the insertion holes and is elastically supported by the insertion holes. The vibration isolator according to claim 1, wherein
An anti-vibration device, wherein a through-hole penetrating in the axial direction of the cylindrical portion is formed in a portion of the stopper main body portion between the cylindrical portion and the stopper plate. The outer member is a rod body having first and second cylindrical portions arranged at intervals in the main load input direction,
The inner cylindrical body is disposed in the first cylindrical portion, and is connected to the inner peripheral surface of the first cylindrical portion via a first elastic member, and the second cylindrical shape. A second inner cylinder disposed in the portion and connected to the inner peripheral surface of the second cylindrical portion via a second elastic member,
The stopper portion is provided in the first cylindrical portion and regulates a relative displacement amount in a main load input direction of the first inner cylindrical body with respect to the rod body,
The stopper main body protrudes from the portion of the inner peripheral surface of the first cylindrical portion facing the first inner cylindrical body in the main load input direction toward the first inner cylindrical body,
The stopper plate has its both end portions facing away from the first inner cylinder in the main load input direction,
Each said insertion hole is formed in the part facing each said insertion part in said 1st cylindrical part, respectively, The vibration isolator characterized by the above-mentioned.

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