JP2022087722A - Vibration insulation device - Google Patents

Abstract

To provide a vibration isolation device having a novel structure which can obtain a soft spring characteristic at the abutment of a stopper, and can prevent the generation of vibration, an impact or the like caused by abrupt highly-dynamic springiness.SOLUTION: In a vibration isolation device 10 in which a first attachment member 12 having a cylindrical part 18 into which an inner bracket 56 is inserted and fixed is connected to a second attachment member 14 by a main body rubber elastic body 16, and which has a stopper mechanism 80 having stopper rubber 42, an open window 28 penetrating a peripheral wall is formed at the cylindrical part 18, the stopper rubber 42 is constituted by including charging rubber 44 firmly adhering to an internal peripheral face of the open window 28 and blocking the open window 28, and protrusion rubber 46 protruding toward an outer periphery of the cylindrical part 18 from the charging rubber 44, and an area of a tip portion of the protrusion rubber 46 located above the open window 28 is set smaller than an area of the charging rubber 44 in the projection of the open window 28 in an insertion direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vibration isolator used for, for example, an automobile engine mount, a motor mount, a differential mount, and the like.

Conventionally, a vibration isolator having a structure in which a first mounting member and a second mounting member are connected by a rubber elastic body of the main body is known, and is used as a mount for a vehicle, for example. Further, as in Japanese Patent Application Laid-Open No. 2015-096754 (Patent Document 1), a vibration isolator having a structure in which an inner bracket is inserted from the side into a tubular portion provided on the first mounting member is also proposed. Has been done.

By the way, the vibration isolator may be provided with a stopper mechanism for limiting the relative displacement amount of the first mounting member and the second mounting member to improve the durability of the rubber elastic body of the main body. In the structure of Patent Document 1, a stopper rubber is fixed to the outer peripheral surface of the tubular portion of the first mounting member, and the tubular portion of the first mounting member and the outer bracket fixed to the second mounting member are used. The stopper mechanism is configured by abutting with the stopper rubber.

JP-A-2015-096754

However, in Patent Document 1, when the distance between the cylindrical portion of the first mounting member and the outer bracket is limited due to the limitation of the arrangement space of the vibration isolator, the thickness of the stopper rubber is increased. It may be difficult to secure enough. In such a case, the spring constant of the stopper rubber may suddenly increase due to compression due to the input of the stopper load, and vibration, impact, or the like may occur due to the sudden increase in the dynamic spring of the vibration isolator.

The problem to be solved of the present invention is to provide a vibration isolator having a novel structure capable of realizing a soft spring characteristic at the time of contact with a stopper and preventing the generation of vibration, impact, etc. due to a sudden increase in high motion spring. It is in.

Hereinafter, preferred embodiments for grasping the present invention will be described, but each of the embodiments described below is described as an example, and not only can be appropriately combined with each other and adopted, but also described in each embodiment. The plurality of components of the above can be recognized and adopted independently as much as possible, and can be appropriately adopted in combination with any of the components described in another embodiment. Thereby, in the present invention, various other embodiments can be realized without being limited to the embodiments described below.

In the first aspect, the first mounting member provided with the tubular portion into which the inner bracket is inserted and fixed is connected to the second mounting member by the main body rubber elastic body, and is connected to the first mounting member. A stopper mechanism that limits the relative displacement between the first mounting member and the second mounting member is configured by contact with the second mounting member side via a stopper rubber fixed to the tubular portion. In the anti-vibration device, an opening window penetrating the peripheral wall is formed in the tubular portion of the first mounting member, and a filling rubber which is fixed to the inner peripheral surface of the opening window and closes the opening window is provided. In addition to being provided, a protruding rubber that protrudes from the filled rubber toward the outer periphery of the tubular portion is provided, and the stopper rubber is configured by including the filled rubber and the protruding rubber, and the opening window. The area of the tip portion of the protruding rubber located on the opening window in the projection in the penetration direction is smaller than the area of the filled rubber.

According to the anti-vibration device having a structure according to this aspect, the dimension of the stopper rubber in the stopper contact direction is larger by the amount of the filled rubber as compared with the case where the stopper rubber is provided so as to project from the outer peripheral surface of the tubular portion. Will be done. Therefore, the spring constant at the time of contact with the stopper rubber is reduced, and the generation of vibration, impact, etc. due to the sudden increase in high-speed spring at the time of contact with the stopper is avoided.

In the region overlapping the opening window in the projection in the penetrating direction of the opening window, the area of the protruding rubber is smaller than the area of the filling rubber, and the filling rubber has a relief portion located away from the protruding rubber. When the protruding rubber comes into contact with the second mounting member such as the outer bracket and the filling rubber is compressed, the filling rubber is deformed in the opening window because the filling rubber is allowed to bulge and deform at the relief portion. It is difficult to be in a restricted restraint state (rubber to death). Therefore, it is possible to prevent a rapid increase in the spring constant of the filled rubber with respect to the compression of the stopper rubber, effectively improve the cushioning performance of the stopper rubber by the filled rubber, and prevent the occurrence of vibration, impact, etc. can.

The second aspect is that in the vibration isolator described in the first aspect, the length dimension of the opening window in the axial direction of the tubular portion is 1/3 or more of the length dimension of the tubular portion. It is 4/5 times or less.

According to the anti-vibration device having a structure according to this aspect, by providing the opening window with a sufficient length in the tubular portion, it becomes easy to obtain a large area of the filled rubber arranged in the opening window, and the stopper can be obtained. It is possible to obtain a large area of the tip portion of the protruding rubber constituting the pressure receiving surface of the rubber. Since the opening window is not too long with respect to the tubular portion, the decrease in strength of the tubular portion due to the formation of the opening window is suppressed, and damage to the tubular portion due to the insertion of the inner bracket, for example, is prevented.

The third aspect is that in the vibration isolator according to the second aspect, the tubular portion has a rectangular tubular shape, and the opening window is provided on the side wall portion of the tubular portion. The width dimension of the opening window is ½ or more of the width dimension of the side wall portion in the circumferential direction of the shaped portion.

According to the anti-vibration device having a structure according to this aspect, it is easy to obtain a large area of the filled rubber arranged in the opening window by providing the opening window with a sufficiently large width dimension in the side wall portion of the tubular portion. Therefore, it is possible to obtain a large area of the tip portion of the protruding rubber constituting the pressure receiving surface of the stopper rubber.

The fourth aspect is that in the vibration isolator described in any one of the first to third aspects, the opening shape of the opening window is substantially quadrangular.

According to the vibration isolator having a structure according to this aspect, it is possible to efficiently secure a large opening area of the opening window as compared with an opening window having a circular opening shape or the like. When an opening window with a rectangular opening shape is adopted, it is desirable that the protruding rubber of the stopper rubber also has a shape that protrudes in a square cross section, and the pressure receiving area of the stopper load is increased while realizing the soft spring characteristics of the filled rubber. It can be secured to a large extent.

A fifth aspect is the area of the tip portion of the protruding rubber located on the opening window in the projection in the penetrating direction of the opening window in the vibration isolator according to any one of the first to fourth aspects. Is more than 1/2 times the area of the entire tip portion of the protruding rubber.

According to the anti-vibration device having a structure according to this embodiment, since more than half of the protruding rubber is located on the opening window, the portion of the stopper rubber located on the opening window where the soft spring characteristics of the filled rubber can be easily set is provided. , It can greatly contribute to the spring characteristics of the entire stopper rubber.

A sixth aspect is that in the vibration isolator according to any one of the first to fifth aspects, a fitting rubber covering the inner peripheral surface of the tubular portion is provided, and the fitting rubber is provided. It is provided integrally with the filling rubber to form the stopper rubber.

According to the anti-vibration device having a structure according to this aspect, since the inner peripheral surface of the tubular portion is covered with the fitting rubber, the inner bracket is used when the inner bracket is inserted and fixed to the tubular portion. It is possible to prevent galling of the tubular part and facilitate the assembly work. Further, the height dimension of the stopper rubber in the input direction of the stopper load is the filling rubber arranged in the opening window of the tubular portion, the protruding rubber arranged on the outer periphery of the tubular portion, and the inner circumference of the tubular portion. With the fitting rubber arranged in, it becomes easier to secure a larger size.

According to the present invention, it is possible to realize a soft spring characteristic at the time of contact with the stopper and prevent the generation of vibration, impact, etc. due to the sudden increase in high motion spring.

A perspective view showing an engine mount as a first embodiment of the present invention in a state where a bracket is attached. FIG. 1 is a cross-sectional view of an engine mount with a bracket shown in FIG. 1, which corresponds to a cross section of II-II in FIG. Section III-III sectional view of FIG. IV-IV sectional view of FIG. Perspective view of the engine mount shown in FIG. Perspective view of the inner shaft member constituting the engine mount shown in FIG. Right side view of the inner shaft member shown in FIG. Partial right side view of the engine mount shown in FIG. Partial right side view of the engine mount as another embodiment of the present invention

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

1 to 4 show, as the first embodiment of the vibration isolator having a structure according to the present invention, an engine mount 10 for an automobile is attached with brackets 56 and 58 described later. As shown in FIG. 5, the engine mount 10 has a structure in which the first mounting member 12 and the second mounting member 14 are elastically connected by the main body rubber elastic body 16. Further, in the following description, as a general rule, the vertical direction refers to the vertical direction in FIG. 2, which is the mount axis direction, and the horizontal direction refers to the horizontal direction in FIG. 2.

As shown in FIG. 6, the first mounting member 12 includes a tubular portion 18 extending in a direction perpendicular to the axis. The tubular portion 18 has a substantially rectangular tubular shape as a whole. The peripheral wall of the tubular portion 18 includes a pair of side wall portions 20, 20, an upper wall portion 22 that connects the upper ends of the side wall portions 20, 20 to each other, and a lower wall portion 24 that connects the lower ends of the side wall portions 20, 20 to each other. Is equipped. The side wall portions 20, 20 and the upper wall portion 22 and the lower wall portion 24 are smoothly continuous without forming corners, and the cross-sectional shape of the tubular portion 18 in the direction perpendicular to the axis is a substantially rounded rectangular shape. .. A circular hole is formed through the lower wall portion 24 of the tubular portion 18, and a tubular fixing portion 26 extending downward from the periphery of the circular hole is provided integrally with the tubular portion 18. There is. The first mounting member 12 including the tubular portion 18 and the fixing portion 26 integrally can be obtained, for example, by pressing a metal plate material.

As shown in FIGS. 6 and 7, the tubular portion 18 includes an opening window 28 penetrating the side wall portion 20. The opening window 28 penetrates the central portion of the side wall portion 20 in the facing direction of the pair of side wall portions 20, 20 (the left-right direction which is the direction orthogonal to the paper surface in FIG. 7). The opening window 28 has a substantially quadrangular opening shape with rounded corners. The opening window 28 has a length dimension (dimension in the left-right direction in FIG. 7 which is the axial direction of the tubular portion 18) L1 and a width dimension (dimension in the vertical direction in FIG. 7 which is the circumferential direction of the tubular portion 18). ) It has a substantially rectangular opening shape larger than W1. The length dimension L1 of the opening window 28 is preferably 1/3 times or more and 4/5 times or less with respect to the axial length dimension L2 of the tubular portion 18. The width dimension W1 of the opening window 28 is preferably ½ times or more the width dimension W2 of the side wall portion 20 in the circumferential direction of the tubular portion 18. As a result, it is possible to suppress a decrease in the strength of the tubular portion 18 due to the formation of the opening window 28 while obtaining a large opening area of the opening window 28. In the present embodiment, the opening windows 28 are provided on the pair of side wall portions 20, 20, respectively, and the opening windows 28, 28 have substantially the same shape and size.

As shown in FIGS. 2 and 3, the second mounting member 14 has a substantially cylindrical shape, and an inner flange-shaped portion 30 projecting toward the inner circumference is provided at the lower end portion. The second mounting member 14 is arranged downward on substantially the same central axis with respect to the first mounting member 12, and the main body rubber elasticity is provided between the first mounting member 12 and the second mounting member 14. The body 16 is arranged.

The main body rubber elastic body 16 has a substantially truncated cone shape, and the upper portion on the small diameter side is vulcanized and adhered to the fixing portion 26 of the first mounting member 12, and the outer peripheral surface of the lower portion on the large diameter side. Is vulcanized and adhered to the second mounting member 14. The main body rubber elastic body 16 is provided with a recess 32 that opens to the lower surface and has a small diameter upward. The recess 32 is located below the fixing portion 26 of the first mounting member 12, and is opened downward on the inner circumference of the inner flange-shaped portion 30 of the second mounting member 14.

A fitting rubber 34 integrally formed with the main body rubber elastic body 16 is fixed to the inside of the first mounting member 12. The fitting rubber 34 covers the inner peripheral surface of the tubular portion 18, is filled in the inner circumference of the fixing portion 26, and is provided with a bracket mounting hole 36 that penetrates the inner circumference of the tubular portion 18. There is.

An upper stopper rubber 38 is fixed to the upper wall portion 22 of the tubular portion 18 of the first mounting member 12. The upper stopper rubber 38 has a substantially quadrangular cross section, and protrudes upward from the upper surface of the upper wall portion 22. The upper stopper rubber 38 has a tapered shape that gradually contracts upward. The upper stopper rubber 38 is formed with a concave groove 40 extending linearly in the axial direction of the tubular portion 18 on the tip surface, and the unevenness of the tip surface due to the concave groove 40 exerts a buffering action when the stopper is contacted, which will be described later. It has become like.

A side stopper rubber 42 as a stopper rubber is fixed to the side wall portion 20 of the tubular portion 18 of the first mounting member 12. The side stopper rubber 42 includes a filling rubber 44 that is fixed to the inner peripheral surface of the opening window 28 and is provided so as to close the opening window 28, and a protruding rubber that protrudes from the filling rubber 44 toward the outer periphery of the tubular portion 18. It is equipped with 46.

The filling rubber 44 fills the inner circumference of the opening window 28. The filled rubber 44 is integrally formed with the fitting rubber 34 in this embodiment. The portion of the fitting rubber 34 that overlaps with the filling rubber 44 in the projection in the penetrating direction (left-right direction in FIG. 2) of the opening window 28 constitutes the side stopper rubber 42. The filled rubber 44 of the present embodiment is filled in the entire inner peripheral region of the opening window 28, but may be thinner than the length in the penetrating direction of the opening window 28, for example.

The protruding rubber 46 is a rubber elastic body having a substantially rectangular block shape, and protrudes from the outer peripheral surface of the tubular portion 18 toward the outer peripheral surface. The protruding rubber 46 of the present embodiment is substantially entirely located on the opening window 28 and is connected to the filling rubber 44. The protruding rubbers 46 are provided on the outer surfaces of the pair of side wall portions 20 and 20 in the facing direction, respectively, and project linearly toward the outside of the pair of side wall portions 20 and 20 in the facing direction. The tip surface of the protruding rubber 46 is formed with a plurality of concave grooves 48 extending in the axial direction of the tubular portion 18, so that the unevenness of the tip surface due to the concave grooves 48 exerts a buffering action when the stopper is contacted, which will be described later. It has become.

The side stopper rubber 42 is composed of the filling rubber 44, the protruding rubber 46, and the fitting rubber 34. The side stopper rubber 42 is provided so as to penetrate the tubular portion 18 through the opening window 28, and the height dimension H in the penetrating direction of the opening window 28 is increased.

In the projection in the penetrating direction (left-right direction in FIG. 2) of the opening window 28 shown in FIG. 8, the area A of the tip portion of the protruding rubber 46 is made smaller than the area B of the filled rubber 44. As a result, the filled rubber 44 includes a pressure receiving portion 50 that overlaps with the tip portion of the protruding rubber 46 in projection in the penetrating direction of the opening window 28, and a relief portion 52 that is located outside the pressure receiving portion 50. In the present embodiment, the entire tip portion of the protruding rubber 46 protruding outward in the left-right direction from the covering rubber 54 described later is located on the opening of the opening window 28 in the projection in the penetrating direction of the opening window 28. Therefore, the area A of the entire tip portion of the protruding rubber 46 is the same as the area of the portion of the tip portion of the protruding rubber 46 located on the opening window 28. For example, when the tip portion of the protruding rubber 46 partially extends outward from the opening window 28 and the tip portion of the protruding rubber 46 is partially located on the opening window 28. The area of the portion of the tip of the protruding rubber 46 located on the opening window 28 is made smaller than the opening area B of the opening window 28, that is, the area B of the filled rubber 44.

In the present embodiment, the length dimension L3 of the tip portion of the protruding rubber 46 is smaller than the length dimension L1 of the opening window 28, and the width dimension W3 of the tip portion of the protruding rubber 46 is the width dimension of the opening window 28. It is made smaller than W1. As a result, in the filling rubber 44 that fills the opening window 28, the relief portion 52 that does not overlap with the tip portion of the protruding rubber 46 in the projection in the penetrating direction of the opening window 28 is annularly formed over the entire circumference of the opening window 28 in the circumferential direction. It is provided continuously.

The protruding rubber 46 of the present embodiment has an inclined shape in which the base end portion widens toward the base end, and a part of the widened portion is located outside the opening window 28. However, since the widened portion is not a portion on which the stopper load acts to form the stopper rubber but is provided for the purpose of alleviating stress concentration, the protruding rubber 46 is substantially entirely the opening window 28. It can be considered to be located above. Further, the widened portion of the protruding rubber 46 allows the bulging deformation of the relief portion 52 of the filling rubber 44 in the input state of the stopper load described later.

The upper stopper rubber 38 and the side stopper rubber 42 are integrally provided with each other, and both are integrally formed with the main body rubber elastic body 16. That is, a coated rubber 54 integrally formed with the main body rubber elastic body 16 is provided so as to cover the tubular portion 18, and the upper stopper rubber 38 and the side stopper rubber 42 include a part of the coated rubber 54. They are integrally connected by 54. The upper stopper rubber 38 and the side stopper rubber 42 project to the outer peripheral side of the tubular portion 18 from the covering rubber 54, and the tip portion is located on the outer peripheral side of the tubular portion 18 from the covering rubber 54. However, the upper stopper rubber 38 and the side stopper rubber 42 may be provided independently of each other, or may not be integrated with the main body rubber elastic body 16.

In the engine mount 10, the first mounting member 12 is mounted to a power unit (not shown) via the inner bracket 56, and the second mounting member 14 is mounted to a vehicle body (not shown) via the outer bracket 58.

The inner bracket 56 is a highly rigid member made of iron or the like, and is integrally formed with a substantially rectangular rod-shaped fitting portion 60 and one end of the fitting portion 60, as shown in FIGS. 3 and 4. It is provided with a mounting portion 62. The fitting portion 60 has an outer peripheral surface shape corresponding to the inner peripheral surface shape of the tubular portion 18, and is inserted into the bracket mounting hole 36 of the fitting rubber 34 to form the first mounting member 12. It is fixed to the tubular portion 18. The mounting portion 62 includes a plurality of bolt holes 64 penetrating in the vertical direction, and is fixed to the power unit by bolts (not shown) inserted through the bolt holes 64.

The outer bracket 58 is a highly rigid member made of iron or the like, and is fixed to the cylindrical mounting portion 66 externally fitted and fixed to the second mounting member 14 and to the tubular mounting portion 66 by means such as welding. It is equipped with a gate-shaped portion 68 that has been welded. The portal portion 68 includes a pair of side leg portions 70, 70 fixed to the outer peripheral surface of the tubular mounting portion 66, and an upper connecting portion 72 that connects the upper ends of the side leg portions 70, 70 to each other. ing. The pair of side legs 70, 70 each have a mounting piece 74 at the lower end thereof, and is fixed to the vehicle body by a bolt (not shown) inserted into a bolt hole 76 penetrating the mounting piece 74. The upper connecting portion 72 of the portal portion 68 is arranged so as to straddle the upper part of the engine mount 10 attached to the tubular mounting portion 66, and the tip surface of the upper stopper rubber 38 is separated from the upper connecting portion 72. Facing each other. The side leg portions 70, 70 of the portal portion 68 are arranged on both outer sides in the left-right direction facing the side wall portions 20, 20 of the tubular portion 18, and the tip surfaces of the side stopper rubbers 42, 42 are on the side. It faces the square legs 70, 70 apart from each other. The surface of the side leg 70 facing the side stopper rubber 42 is a flat surface extending substantially orthogonal to the left-right direction, and faces the tip surface of the protruding rubber 46 of the side stopper rubber 42 substantially parallel to the surface. ing. The gate-shaped portion 68 extends in a groove-shaped cross section, and at both ends in the groove width direction (left-right direction in FIG. 3), reinforcing ribs 77 projecting outward to form a side wall of the groove-shaped cross section. Are provided to improve the load bearing capacity of the portal portion 68 with respect to the input of the stopper load. The reinforcing rib 77 continuously extends to the mounting pieces 74 and 74 provided at both ends of the portal portion 68.

When the vibration isolation target vibration is input in the vertical direction between the first mounting member 12 and the second mounting member 14 in the mounted state of the engine mount 10 on the vehicle, the first mounting member 12 and the second mounting member 12 The main body rubber elastic body 16 connecting the mounting member 14 is elastically deformed, and the desired anti-vibration effect is exhibited based on the energy damping action due to the internal friction of the main body rubber elastic body 16 and the vibration insulation action due to the low motion spring. Will be done.

When vertical vibration with a significantly large amplitude is input and the first mounting member 12 is largely displaced upward with respect to the second mounting member 14, the upper wall portion of the tubular portion 18 of the first mounting member 12 22 and the upper connecting portion 72 of the outer bracket 58 fixed to the second mounting member 14 are indirectly in contact with each other via the upper stopper rubber 38. As a result, the relative displacement amount of the first mounting member 12 and the second mounting member 14 is limited, and damage due to excessive deformation of the main body rubber elastic body 16 is avoided. As described above, in the engine mount 10, the upper stopper mechanism 78 that limits the amount of upward relative displacement of the first mounting member 12 with respect to the second mounting member 14 in the mounted state on the vehicle is on the tubular portion 18. It is configured by contact between the wall portion 22 and the upper connecting portion 72 of the outer bracket 58 via the upper stopper rubber 38.

Further, when a vibration in the left-right direction having a remarkably large amplitude is input and the first mounting member 12 is largely displaced in the left-right direction with respect to the second mounting member 14, the tubular portion 18 of the first mounting member 12 is subjected to. The fitting portion 60 of the fitted inner bracket 56 and the side leg portion 70 of the outer bracket 58 fixed to the second mounting member 14 are indirectly in contact with each other via the side stopper rubber 42. As a result, the relative displacement amount of the first mounting member 12 and the second mounting member 14 is limited, and damage due to excessive deformation of the main body rubber elastic body 16 is avoided. As described above, the side stopper mechanism 80 as a stopper mechanism for limiting the amount of relative displacement of the first mounting member 12 to the second mounting member 14 in the left-right direction is the fitting portion 60 of the inner bracket 56 and the outer bracket. It is configured by contact with the side leg 70 of 58 via the side stopper rubber 42. In the present embodiment, the side stopper mechanism 80 is provided on both the left and right sides.

The side stopper rubber 42 constituting the side stopper mechanism 80 is provided so as to penetrate the opening window 28 of the tubular portion 18 and is overlapped with the fitting portion 60 of the inner bracket 56. Therefore, the height dimension H of the side stopper rubber 42 in the input direction of the stopper load is filled as compared with the side stopper rubber of the conventional structure provided in a state of being overlapped on the outer surface of the side wall portion of the tubular portion. It is increased by the amount of the rubber 44 and the fitting rubber 34. As a result, the spring constant of the side stopper rubber 42 at the initial stage of inputting the stopper load can be reduced, and the soft spring characteristics at the initial stage of contact of the side stopper rubber 42 can be realized. As a result, when the tip portion of the side stopper rubber 42 abuts on the outer bracket 58, abrupt changes in the spring characteristics of the engine mount 10 are avoided, and vibration and impact are avoided when the stopper abuts. Will be done.

The protruding rubber 46 of the side stopper rubber 42 is filled so that the contact area A of the tip portion with the outer bracket 58 is filled in the opening window 28 in the projection in the penetration direction (stopper load input direction) of the opening window 28. It is made smaller than the area B of the rubber 44. As a result, the filled rubber 44 is provided with not only a pressure receiving portion 50 that integrally constitutes the side stopper rubber 42 with the protruding rubber 46, but also a relief portion 52 that is detached from the pressure receiving portion 50. Then, when the stopper load is input to the protruding rubber 46, the pressure receiving portion 50 is compressed in the input direction by the stopper load, and the pressure receiving portion 50 tends to bulge and deform in the direction orthogonal to the input direction of the stopper load. The bulging deformation of the pressure receiving portion 50 is allowed by the deformation of the relief portion 52 located around the pressure receiving portion 50, and the bulging deformation is performed on the left and right outer surfaces where the relief portion 52 is a free surface. In short, since the bulging deformation of the relief portion 52 is allowed on the left and right outer surfaces, the spring constant of the pressure receiving portion 50 in the input direction of the stopper load is reduced, and the side stopper rubber 42 including the pressure receiving portion 50 is low. Spring is planned. Therefore, when the side stopper rubber 42 comes into contact with the outer bracket 58, the side stopper rubber 42 having a small spring constant exerts an excellent buffering action, and vibration and impact at the time of contact are reduced.

The side stopper rubber 42 of the present embodiment has a higher height dimension H by including a part of the fitting rubber 34, and the cushioning performance is improved. Further, since the fitting rubber 34 is connected to the relief portion 52 of the filling rubber 44, the spring of the fitting rubber 34 is reduced in the same manner as the pressure receiving portion 50 of the filling rubber 44, and the side stopper rubber is used. The excellent cushioning performance of 42 is effectively exhibited.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific description thereof. For example, in the above embodiment, the structure of the present invention is applied to the side stopper mechanism 80, but for example, the structure of the present invention can be applied to the upper stopper mechanism 78.

The opening shape of the opening window 28 is not limited to a substantially square shape, and may be, for example, a circular shape, a polygonal shape other than a square shape, a modified shape, or the like. Further, the cross-sectional shape of the stopper rubber 42 in the direction orthogonal to the protruding direction of the protruding rubber 46 is not limited to a substantially square shape, and may be, for example, a circular shape, a polygonal shape other than a square shape, or a modified shape. It is desirable that the opening shape of the opening window 28 and the cross-sectional shape in the direction orthogonal to the protruding direction of the protruding rubber 46 correspond to each other, but the shapes may be different from each other.

In the above embodiment, an example is shown in which the entire tip portion of the protruding rubber 46 is located on the opening window 28 in the projection in the penetrating direction of the opening window 28. For example, as shown in FIG. 9, the protruding rubber The tip portion of 46 may be located partially off the opening window 28. In this case, in the projection in the penetrating direction of the opening window 28, the area A1 of the portion located on the opening window 28 at the tip portion of the protruding rubber 46 is larger than the area A of the filling rubber 44 (opening area of the opening window 28) B. Be made smaller. Further, in the projection of the tip portion of the protruding rubber 46 in the penetrating direction of the opening window 28, the area A1 of the portion located on the opening window 28 is ½ or more of the total area A (A1 ≧ A / 2). Is desirable. As a result, the spring characteristics of the side stopper rubber 42 are greatly affected by the portion where the height dimension is largely secured by the filled rubber 44 and the fitting rubber 34, and the soft spring characteristics can be realized. Further, the region where the tip portion of the protruding rubber 46 is partially displaced from the opening window 28 makes it possible to expand the tuned range including the improvement of the stopper rigidity of the side stopper rubber 42. In FIG. 9, the portion of the tip of the protruding rubber 46 located on the opening window 28 is colored in gray.

The protruding rubber may have a tapered stepped shape or a tapered shape, and the area of the stopper contact surface at the tip portion of the protruding rubber may be smaller than the area of the filled rubber. In this case, the bulging deformation of the relief portion of the filled rubber is allowed by the portion of the protruding rubber that is off the stopper contact surface and the action of the stopper load is small.

Further, the contact surface of the outer bracket 58 with the protruding rubber 46 is not necessarily limited to a flat surface, and for example, unevenness, a step, a taper, or the like may be set. When the tip portion of the protruding rubber 46 partially abuts on the contact surface at the initial stage of contact due to the unevenness of the contact surface on the second mounting member 14 side of the stopper mechanism 80, the protruding rubber 46 The contact area of the portion of the tip of the rubber that comes into contact with the contact surface at the initial stage of contact is made smaller than the area of the filled rubber 44.

As shown as the concave groove 48 in the above embodiment, regarding the unevenness for improving the initial hitting characteristics such as buffering and reducing the tapping sound provided at the tip portion of the protruding rubber 46, the presence or absence of the unevenness indicates the area of the protruding tip portion. Does not affect. Similarly, the presence or absence of widening of the base end portion of the protruding rubber 46 does not affect the area of the protruding tip portion of the protruding rubber 46. The area of the protruding tip portion of the protruding rubber 46 is the area of the region that is in contact with the second mounting member (outer bracket 58) when the stopper function is substantially started (the shape of the region before deformation). (Area converted to), and specifically, for example, it can be grasped as the area of the contact area with the second mounting member in the linear region of the spring characteristic of the stopper rubber 42. Further, for example, as the area of the contact area with the second mounting member at the time of inputting a load of 1/5 of the planned or assumed stopper input load in the stopper rubber 42, or the maximum allowable in the stopper rubber 42. It is also possible to specifically grasp the area of the contact area with the second mounting member in the deformed state of 1/5 of the deformation amount.

Further, it is desirable that the outer peripheral surface of the protruding rubber 46 does not have an overhang or an undercut shape. Preferably, in consideration of the punching taper, it is preferable that the outer peripheral surface of the protruding rubber 46 is inclined so that the cross section becomes slightly smaller in the protruding direction. Thereby, it is preferable that the cross-sectional area of the protruding rubber 46 is the same as or larger than the area of the protruding tip portion.

Further, the area of the filled rubber 44 larger than the area of the tip portion of the protruding rubber 46 protrudes in the input direction of the stopper load to the protruding rubber 46 (or the penetrating direction of the opening window 28 or the protruding direction of the protruding rubber 46). It is desirable to be secured by a region located on the outer periphery of the tip portion of the rubber 46. Specifically, for example, as in the first embodiment, in the projection of the protruding rubber 46 in the protruding direction, the filled rubber 44 (or the opening window 28) is slightly larger around the entire tip portion of the protruding rubber 46. The filled rubber 44 (or the opening window 28) is partially around the tip portion of the protruding rubber 46, or by projection in the protruding direction of the protruding rubber 46, for example as in another embodiment. This can be realized by widening the protruding rubber 46 toward the outer peripheral side of the tip portion.

In the above embodiment, an example in which only one opening window 28 is provided on the side wall portion 20 of the tubular portion 18, but for example, two or more opening windows 28 may be formed on the side wall portion 20. According to this, it is possible to obtain a large total opening area of the opening window 28 while ensuring the deformation rigidity of the tubular portion 18.

The tubular portion 18 of the first mounting member 12 is not limited to a square cylinder, and may be, for example, a cylinder, a polygonal cylinder other than a square cylinder, a deformed cylinder, or the like. Further, the fitting rubber 34 fixed to the inner peripheral surface of the tubular portion 18 may not be provided, and the inner bracket 56 may be directly press-fitted into the tubular portion 18 to be fixed. In that case, the stopper rubber 42 is composed of the protruding rubber 46 and the filling rubber 44.

In the above embodiment, a solid type anti-vibration device having no internal fluid chamber, active anti-vibration device, or the like has been exemplified. The present invention can also be applied to a vibration isolator, an active fluid-filled vibration isolator provided with an active vibration damping device such as a vibration isolator, and the like.

10 Engine mount (vibration isolation device)
12 First mounting member 14 Second mounting member 16 Main body rubber elastic body 18 Cylindrical part 20 Side wall part 22 Upper wall part 24 Lower wall part 26 Fixed part 28 Opening window 30 Inner flange-shaped part 32 Recessed part 34 Fitting rubber 36 Bracket mounting hole 38 Upper stopper rubber 40 Recessed groove 42 Side stopper rubber (stopper rubber)
44 Filling rubber 46 Protruding rubber 48 Concave groove 50 Pressure receiving part 52 Relief part 54 Covered rubber 56 Inner bracket 58 Outer bracket 60 Fitting part 62 Mounting part 64 Bolt hole 66 Cylindrical mounting part 68 Gate shape part 70 Side leg part 72 Upper Connecting part 74 Mounting piece 76 Bolt hole 77 Reinforcing rib 78 Upper stopper mechanism 80 Side stopper mechanism (stopper mechanism)

Claims (6)

The first mounting member having a cylindrical portion into which the inner bracket is inserted and fixed is connected to the second mounting member by a rubber elastic body of the main body.
The relative displacement amount between the first mounting member and the second mounting member is determined by the contact between the first mounting member and the second mounting member side via the stopper rubber fixed to the tubular portion. It is a vibration isolation device that has a stopper mechanism to limit it.
An opening window penetrating the peripheral wall is formed in the cylindrical portion of the first mounting member.
A filling rubber that is fixed to the inner peripheral surface of the opening window and closes the opening window is provided, and a protruding rubber that protrudes from the filling rubber toward the outer periphery of the tubular portion is provided, and the filling rubber is provided. The stopper rubber is configured to include the protruding rubber and the protruding rubber.
A vibration isolator in which the area of the tip portion of the protruding rubber located on the opening window is made smaller than the area of the filled rubber in the projection in the penetrating direction of the opening window. The vibration isolator according to claim 1, wherein the length dimension of the opening window in the axial direction of the tubular portion is 1/3 times or more and 4/5 times or less the length dimension of the tubular portion. The tubular portion has a rectangular tubular shape, the opening window is provided on the side wall portion of the tubular portion, and the width dimension of the opening window in the circumferential direction of the tubular portion is the width dimension of the side wall portion. The anti-vibration device according to claim 2, which is more than 1/2 times the size of the vibration isolator. The anti-vibration device according to any one of claims 1 to 3, wherein the opening shape of the opening window is substantially quadrangular. Claims 1 to 1 in which the area of the tip portion of the protruding rubber located on the opening window is 1/2 times or more the area of the entire tip portion of the protruding rubber in the projection in the penetrating direction of the opening window. The anti-vibration device according to any one of 4. A fitting rubber that covers the inner peripheral surface of the tubular portion is provided.
The vibration isolator according to any one of claims 1 to 5, wherein the fitting rubber is provided integrally with the filling rubber to form the stopper rubber.

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