JP5427095B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator, and particularly to a vibration isolator capable of reducing inertance while reducing product cost.

  As a vibration isolator for supporting a vibration generating body such as an engine on a vehicle body, a mount device configured by connecting a lower member attached to the vehicle body side to an upper member by a vibration isolating base made of a rubber-like elastic body, and its mount 2. Description of the Related Art There is known a vibration isolator including a bracket member that is attached to the upper member of the device and has a tip end attached to the vibration generator side.

  In the vibration isolator having such a structure, for example, Patent Document 1 discloses a bracket member in order to regulate the relative displacement amount of the bracket member (connecting member) with respect to the lower member (second fixture) of the mounting device. A displacement restricting member that surrounds the front end side is fixed to the lower member of the mounting device, and a rubber elastic body is formed on the outer surface of the bracket member in order to mitigate an impact when the bracket member comes into contact with the displacement restricting member. A technique for covering the stopper rubber member is disclosed.

JP 2008-128410 A (FIG. 4 etc.)

  However, in the conventional vibration isolator described above, when the bracket member resonates and vibrates at a specific frequency, the stopper rubber member also vibrates integrally following the bracket member, so that the stopper rubber member acts as a mass body. As a result, there was a problem that the inertance deteriorated. Therefore, it is necessary to attach a dynamic damper to absorb the vibration energy of the bracket member as a substitute, and there is a problem that the product cost increases accordingly.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolator capable of reducing the inertance while reducing the product cost.

Means for Solving the Problems and Effects of the Invention

  According to the vibration isolator of claim 1, the mount device has the upper member and the lower member connected by the vibration isolating base made of a rubber-like elastic body, and the tip of the bracket member is connected to the upper member of the mount device. Since the lower side member is attached to the vehicle body side, and the base side of the bracket member is attached to the vibration generator side, the vibration generator is elastically supported by the vehicle body.

  In addition, a displacement regulating member that surrounds the front end side of the bracket member is fixed to the lower member of the mounting device, and at least the outer surface of the front end side of the bracket member is covered with a stopper rubber member made of a rubber-like elastic body. Therefore, when the bracket member abuts on the inner surface of the displacement regulating member, the relative displacement amount of the vibration generating body with respect to the vehicle body is regulated, and the impact when the bracket member abuts on the inner surface of the displacement regulating member is the stopper rubber. Relieved by the member.

  Here, the bracket leading end portion of the bracket member is attached to the upper member of the mounting device and supported by the vibration isolation base, so that the support rigidity is weaker than the bracket base portion attached to the vibration generator side. Therefore, when the bracket member resonates at a specific frequency, the bracket member is vibrated up and down in such a manner that the base side of the bracket base portion serves as a base point and the front end side of the bracket front end side has the maximum amplitude.

In this case, according to the vibration isolator according to claim 1, the stopper rubber member covers the outer surface of the bracket tip portion of the bracket member and functions as a stopper rubber when the vibration generator is largely displaced; A base rubber portion that is connected to the tip rubber portion and covers the outer surface of the bracket base portion of the bracket member and functions as a close contact portion that adheres closely to the outer surface of the bracket base portion and suppresses rattling; The bracket tip of the bracket member is formed in a rectangular parallelepiped shape with a rectangular cross section, and the tip rubber part of the stopper rubber member attached to the bracket tip of the rectangular parallelepiped has an opening size that exposes the entire lower surface of the bracket tip In addition, a gap is formed between the inner surface of the tip rubber portion and both side surfaces of the bracket tip portion. It is socket member there is an effect that it is possible to reduce the inertance when resonate at a specific frequency.

  That is, when the bracket member resonates at a specific frequency and the distal end side of the bracket distal end portion is displaced downward, the bracket distal end portion of the bracket member is moved from the opening formed in the distal rubber portion of the stopper rubber member. You can escape downward. In this case, force is transmitted from the both side surfaces of the bracket tip portion that is displaced downward to the inner surface of the stopper tip portion by the gap formed between the both side surfaces of the bracket tip portion and the stopper tip portion of the stopper rubber member. Can be suppressed. Thereby, it is possible to displace the bracket member downward while suppressing the stopper rubber member from following the bracket member, and to reduce the stopper rubber member from acting as a mass pair. On the other hand, when the tip end side of the bracket tip end portion is displaced upward, the tip end portion of the stopper rubber member is collided with the inner surface of the tip rubber portion of the stopper rubber member. Since the input in the direction opposite to the displacement can be relatively applied from the rubber portion to the bracket tip portion of the bracket member, the vibration of the bracket member can be attenuated. As a result, inertance can be reduced.

  In addition, if the inertance can be reduced in this way, there is no need to provide a dynamic damper for alternatively absorbing the vibration energy of the bracket member, so that the product cost can be reduced accordingly. is there.

Further , since the base rubber portion is in close contact with the outer surface of the bracket base portion when the front end side of the bracket front end portion is displaced, there is an effect that unnecessary rattling of the stopper rubber member can be suppressed. Incidentally, when the bracket member is resonant at a particular frequency, the tip end of the bracket tip end side root side of the bracket base portion as a base point bracket member in a manner that the maximum amplitude is vibrated up and down, scan Toppagomu member and the bracket member, that adheres to the portion where the amplitude called root rubber portion and the bracket base portion becomes smaller, while suppressing acting as a mass body to follow the stopper rubber member to the displacement of the upper and lower bracket members The rattling of the stopper rubber member can be efficiently suppressed.
In addition, when the bracket member resonates at a specific frequency and the tip end side of the bracket tip portion is displaced in the vertical direction, the tip end side of the bracket member becomes the maximum amplitude portion, but by providing a bracket opening on the tip end side, The tip side which is the maximum amplitude portion can be reduced in weight. Thereby, there exists an effect that generation | occurrence | production of abnormal noise when the bracket front-end | tip part collides with the inner surface of a stopper rubber member can be suppressed.
Furthermore, by providing the second recess at the position corresponding to the tip side of the bracket tip in the stopper rubber member (the tip surface connecting the pair of side surfaces and the upper surface), compared to the case where the second recess is not provided, The contactable area between the stopper rubber member and the bracket tip portion can be reduced on the tip surface portion side where the amplitude is maximized. Therefore, since the stopper rubber member can be prevented from following, the inertance can be reduced. Furthermore, by providing the bracket opening and the second recess, there is an effect that water or the like that has entered the bolt fixing portion can be discharged to the outside.

According to the vibration damping device according to claim 2, wherein, in addition to the effects of the anti-vibration device according to claim 1 Symbol placement, the recessed portion on the outer surface of the bracket member is recessed, the recess of the bracket member Since the fitting protrusion to be fitted protrudes from the inner surface of the stopper rubber member, the stopper rubber member is detached from the bracket member by fitting the recessed portion of the bracket member and the fitting protrusion of the stopper rubber member. There is an effect that can be made difficult. The bracket member is vibrated up and down in such a manner that the front end side of the bracket front end side has the maximum amplitude with the base side of the bracket base portion as a base point. However, since the base rubber part of the stopper rubber member and the bracket base part of the bracket member are formed in the portions where the amplitude is small, the stopper rubber member follows the vertical displacement of the bracket member and acts as a mass body. It is possible to easily maintain the fitting state between the fitting protrusion and the recessed portion while suppressing the stopper rubber member from being detached from the bracket member.

According to the vibration isolating device according to claim 3, in addition to the effects of the vibration damping device according to claim 1 or 2, the tip projecting portion is projected from the distal end surface of the bracket tip end portion of the bracket member, the bracket tip Since the tip recess that fits into the tip protrusion is recessed in the inner surface of the tip rubber part of the stopper rubber member, a gap is formed between the inner surface of the tip rubber part and both side surfaces of the bracket tip of the bracket member Even if it is, the relative position of the tip rubber part of the stopper rubber member with respect to the bracket tip part of the bracket member is maintained by fitting the tip protrusion of the bracket tip part and the tip recess part of the tip rubber part, It is possible to prevent the gap between the inner surface of the tip rubber portion and both side surfaces of the bracket tip portion from being biased to one side. That is, the tip rubber part of the stopper rubber member is displaced with respect to the bracket tip part of the bracket member, the gap is biased to one side surface of the bracket tip part, and the side on which the gap is biased (the side where the gap becomes large) If the side surface of the bracket tip of () abuts against the inner surface of the displacement regulating member, abnormal noise is generated. However, in claim 4, since the gap between the tip protrusion and the tip recess can be suppressed, bias deviation can be suppressed. There is an effect that the generation of abnormal noise can be prevented in advance.

  Further, the front end protrusion of the bracket front end portion extends in the vertical direction on the front end surface of the bracket front end portion, and the front end recessed portion of the front end rubber portion is formed by opening the lower surface side of the front end rubber portion. Therefore, when the bracket member resonates at a specific frequency and the tip end side of the bracket tip portion is displaced downward, the tip protrusion of the bracket tip portion is moved downward from the opening on the lower surface side of the tip rubber portion. You can get away. As a result, even when the front end protrusion of the bracket front end and the front end recess of the stopper rubber member are fitted to prevent the generation of abnormal noise (that is, gap deviation), the vertical displacement of the bracket member is reduced. There is an effect that it is possible to suppress the stopper rubber member from following and acting as a mass body.

It is a top view of the vibration isolator in 1st Embodiment of this invention. It is sectional drawing of the vibration isolator in the II-II line of FIG. (A) is a top view of a bracket member, (b) is a side view of the bracket member in the arrow IIIb direction view of FIG. 3 (a). It is a side view of the bracket member in the arrow IV direction view of Fig.3 (a). (A) is a top view of a stopper rubber member, (b) is a bottom view of a stopper rubber member. (A) is a side view of the stopper rubber member in the arrow VIa view of FIG. 5 (a), and (b) is a cross-sectional view of the stopper rubber member taken along the line VIb-VIb of FIG. 5 (a). It is sectional drawing of the stopper rubber member in the VII-VII line of Fig.5 (a). It is a top view of the bracket member with which the stopper rubber member was mounted | worn. It is a bottom view of the bracket member with which the stopper rubber member was mounted | worn. It is a side view of the bracket member with which the stopper rubber member was mounted | worn. FIG. 10 is a partially enlarged bottom view of the bracket member in the XI portion of FIG. 9. It is a partial cross section side view of a vibration isolator. It is a graph which shows the result of an impact test. (A) is a top view of the bracket member in 2nd Embodiment, (b) is a side view of the bracket member in the arrow XIVb view of Fig.14 (a). (A) is a top view of the stopper rubber member in 2nd Embodiment, (b) is a bottom view of a stopper rubber member. It is sectional drawing of the stopper rubber member in the XVI-XVI line | wire of FIG. It is a fragmentary sectional side view of the bracket member with which the stopper rubber member was mounted | worn. (A) is a top view of the bracket member in 3rd Embodiment, (b) is sectional drawing of the stopper rubber member in 3rd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the overall configuration of the vibration isolator 100 will be described with reference to FIGS. 1 and 2. FIG. 1 is a top view of the vibration isolator 100 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the vibration isolator 100 taken along the line II-II in FIG. In FIG. 2, a state in which a predetermined shared load is applied to the mounting apparatus 10 is illustrated.

  As shown in FIGS. 1 and 2, the vibration isolator 100 supports and fixes a vibration generating body (not shown) such as an engine of an automobile, and also generates vibration generated from the vibration generating body (not shown). Of the mounting device 10, the bracket member 20 that couples the mounting device 10 to the vibration generator side, the displacement restricting member 30 that surrounds the bracket member 20, and the bracket member 20. A stopper rubber member 40 that covers the outer surface is mainly provided.

  The mounting device 10 includes an upper member 11 formed in a tapered conical shape downward from the aluminum alloy (lower side in FIG. 2), and a lower member 12 positioned below the upper member 11 with a space therebetween. And an anti-vibration base 13 that connects the upper member 11 and the lower member 12 and is made of a rubber-like elastic body.

  In the upper member 11, the upper surface (upper side surface in FIG. 2) serving as a mounting surface of the bracket member 20 is formed as a flat surface, and a vibration-proof base is vulcanized and bonded to the outer peripheral surface and the lower surface. A female screw portion extending along the axis is formed at the center of the upper surface of the upper member 11, and the bracket member 20 is fastened and fixed to the upper member 10 by a bolt B screwed to the female screw portion.

  The lower member 12 is formed of a steel material in a cylindrical shape, and a cylindrical metal fitting 12a to which an anti-vibration base body 13 is vulcanized and bonded to an inner peripheral surface, and a cylindrical steel fitting in which the cylindrical metal fitting 12a is fitted on the inner peripheral side. And an outer metal fitting 12b formed of a material. The lower member 12 is fixed with mounting plate members 51 and 52 attached to the vehicle body side.

  A diaphragm 14 is attached to the lower end opening of the cylindrical member 12a of the lower member 12 to form a liquid sealing chamber in which a liquid such as ethylene glycol is sealed between the diaphragm 14 and the vibration isolating base 13. Has been. The liquid sealing chamber is partitioned by a partition 15 into a first liquid chamber 16a on the vibration-proof base side and a second liquid chamber 16b on the diaphragm 14 side, and the first liquid chamber 16a and the second liquid chamber 16b are The orifices 17 formed along the outer periphery of the partition 15 communicate with each other.

  The bracket member 20 is a connecting member for connecting the upper member 11 of the mounting device 10 to the vibration generator side, and is formed in a flat bar shape from an aluminum alloy. The bracket member 20 is fastened and fixed to the upper surface (upper side surface in FIG. 2) of the upper member 11 of the mounting apparatus 10 by bolts B at the tip side (upper side in FIG. 1, left side in FIG. 2). The right side of FIG. 2 is fastened and fixed to the vibration generator by a bolt (not shown). The detailed configuration of the bracket member 20 will be described later with reference to FIGS. 3 and 4.

  The displacement regulating member 30 is a stopper member for regulating the displacement of the bracket member 20, is formed of a steel material, and is fixed to the outer metal fitting 12 b of the lower member 12. The displacement regulating member 30 has an opening 30a formed on the side (the lower side in FIG. 1, the right side in FIG. 2), and is formed so as to cover the outer surface of the bracket member 20 inserted through the opening 30a. .

  That is, the inner surface of the displacement restricting member 30 includes the upper surface (front side surface in FIG. 1, front side surface in FIG. 2), both side surfaces (right side surface in FIG. 1, front side surface in FIG. 1 and the upper surface (left side surface in FIG. 2). Therefore, when a large amplitude vibration is input from the vibration generator to the vibration isolator 100, the portion surrounded by the displacement regulating member 30 of the bracket member 20 is brought into contact with the inner surface of the displacement regulating member 30. Thus, the relative displacement of the bracket member 20 with respect to the mounting device 10 is restricted.

  In addition, a flange portion 30b is formed to project outward from the periphery of the opening 30a of the displacement regulating member 30. A circular opening 30c having an inner diameter through which the head of the bolt B can be inserted is formed on the upper surface of the displacement regulating member 30. In addition, a bounce restricting member 31 is fixed to the opening 30a of the displacement restricting member 30 between the upper end of the outer metal fitting 12b of the lower member 12 and the bracket member 20, and the bracket member 20 is displaced downward. It is comprised so that it can regulate.

  The stopper rubber member 40 is a bottomed cylindrical body that is vulcanized and molded from a rubber-like elastic body separately from the bracket member 20, and the bracket member 20 is inserted into the cylindrical body from the front end side. The outer surface of the bracket member 20 is covered. Thereby, the impact when the bracket member 20 is brought into contact with the inner surface of the displacement regulating member 30 is reduced. The detailed configuration of the stopper rubber member 40 will be described later with reference to FIGS.

  Next, the detailed configuration of the bracket member 20 will be described with reference to FIGS. 3 and 4. FIG. 3A is a top view of the bracket member 20, and FIG. 3B is a side view of the bracket member 20 as viewed in the direction of arrow IIIb in FIG. FIG. 4 is a side view of the bracket member 20 as viewed in the direction of arrow IV in FIG.

  As shown in FIGS. 3 and 4, the bracket member 20 is surrounded by the inner surface of the displacement restricting member 30 and is fastened and fixed to the upper member 11 of the mount device 10 by bolts B, A bracket base portion 22 is provided that is connected to the bracket distal end portion 21 and protrudes from the opening 30a of the displacement regulating member 30 in a direction perpendicular to the axis of the mount device 10 and is attached to the vibration generator side ( (See FIG. 2).

  The bracket tip 21 is formed in a rectangular parallelepiped shape in which the cross-sectional shape perpendicular to the longitudinal direction (FIG. 3 (a) vertical direction, FIG. 4 horizontal direction) is rectangular, and the bottom surface of the rectangular parallelepiped shape (FIG. 4 (lower side surface in FIG. 4) is formed in a flat surface shape as a contact surface that contacts the upper surface of the upper member 11 of the mount device 10.

  On the upper surface of the bracket tip 21 (FIG. 3 (a), the front side of the paper, and the upper side of FIG. 4), a bolt fixing portion 21a having a circular shape when viewed from above is recessed toward the lower surface, and at the center of the bottom surface of the bolt fixing portion 21a. Are formed with concentrically circular bolt insertion holes 21b through which the shaft portion of the bolt B is inserted. The bottom surface of the bolt fixing portion 21a is formed in parallel with the lower surface of the bracket tip portion 21 and serves as a seating surface of the head of the bolt B.

  Both side surfaces of the bracket tip 21 (left and right surfaces in FIG. 3 (a), back side surface and front side surface in FIG. 4) are flat surfaces parallel to each other, and these both side surfaces are formed in a U-shaped cross section. Recessed grooves 21c extending in the vertical direction (the vertical direction in FIG. 3 (a), the vertical direction in FIG. 4) from the upper surface to the lower surface of the bracket tip 21 are respectively provided. The width dimension between both side surfaces of the bracket tip 21 is set to the dimension W. The height dimension between the upper and lower surfaces of the bracket tip 21 is set to the dimension H.

  The front end surface of the bracket front end portion 21 (upper side surface in FIG. 3A, right side surface in FIG. 4) is formed as a flat surface orthogonal to the upper and lower surfaces and both side surfaces of the bracket front end portion 21, and its width direction (FIG. 3). (A) Left and right direction) A tip protrusion 21d is partially provided in the center. The distance between the front end surface of the bracket front end portion 21 (surface formed as a flat surface) and the side surface (upper side surface in FIG. 3A) of the recessed groove 21c on the bracket front end portion 21 side is the dimension M. Is set.

  As shown in FIG. 3A, the tip protrusion 21d is formed in an arc shape concentrically with the bolt fixing portion 21a as shown in FIG. (A) It is extended in the paper surface perpendicular direction and the up-down direction of FIG.

  In addition, the bracket front-end | tip part 21 is provided with the opening part 21e formed by opening in the connection part of the bottom face of the volt | bolt fixing | fixed part 21a, and the front-end | tip protrusion 21d (refer FIG. 2). Thereby, the front end side of the bracket member 20 can be reduced in weight, and the resonance frequency can be lowered. Moreover, the water etc. which penetrate | invaded in the bolt fixing | fixed part 21a can be discharged | emitted outside.

  The bracket base portion 22 has a width dimension (dimension in the left-right direction in FIG. 3 (a)) larger than that of the bracket tip portion 21, and is aligned with the rear end face (lower side face in FIG. 3 (a), left side face in FIG. 4). A pair of mounting holes 22a are formed, and mounting bolts 22b are arranged from the lower surface side (the lower side in FIG. 3B) at the width direction end (the left side in FIGS. 3A and 3B). It protrudes downward.

  The bracket base portion 22 has a plate thickness on the side where the mounting bolt 22b is disposed thinner than a plate thickness on the side where the mounting bolt 22b is drilled. Except for the portion where the plate thickness is reduced, the height dimension (plate thickness) between the upper and lower surfaces of the bracket base portion 22 is equal to the height dimension between the upper and lower surfaces of the bracket tip 21 and is set to the dimension H. Has been.

  The bracket member 20 is configured such that bolts protruding from the vibration generator side are inserted into the pair of mounting holes 22a, the mounting bolt 22b is passed through the mounting holes on the vibration generator side, and these bolts are fastened and fixed with nuts. The bracket base portion 22 is attached to the vibration generator side.

  Next, the stopper rubber member 40 will be described with reference to FIGS. FIG. 5A is a top view of the stopper rubber member 40, and FIG. 5B is a bottom view of the stopper rubber member 40. 6A is a side view of the stopper rubber member 40 as viewed in the direction of arrow VIa in FIG. 5A, and FIG. 6B is a side view of the stopper rubber member 40 taken along the line VIb-VIb in FIG. It is sectional drawing. FIG. 7 is a cross-sectional view of the stopper rubber member 40 taken along the line VII-VII in FIG.

  As shown in FIG. 5 to FIG. 7, the stopper rubber member 40 includes an upper surface portion 41, a lower surface portion 42 that is arranged to face the upper surface portion 41 in parallel with a predetermined interval, and the upper surface portion 41 and the lower surface portion 42. A pair of side surface portions 43 that connect the pair of side surface portions 43 and a front end surface portion 44 that connects the top surface portion 41, and one side (the lower side in FIG. 5, the left side in FIG. 6) is formed by these surface portions 41 to 44. It is formed in an open substantially cylindrical shape. From the opening of the cylindrical body, the bracket member 20 is inserted from the distal end side, whereby the outer surface of the bracket member 20 is covered with the stopper rubber member 40 (see FIGS. 8 to 10).

  The upper surface portion 41 is disposed on the upper surface of the bracket member 20 (see FIGS. 8 to 10), and is a portion that functions as a stopper rubber when the vibration generator is greatly displaced in the rebound direction (upward in FIG. 2). It is formed in a flat plate shape having a substantially rectangular shape and a substantially constant plate thickness. A plurality of hemispherical protrusions 41b protrude from the upper surface of the upper surface portion 41, and a circular upper surface as viewed from above can be inserted into the center of the upper surface portion 41 through the head of the bolt B (see FIG. 2). An insertion hole 41a is formed. The upper surface insertion hole 41a is arranged concentrically with the bolt fixing portion 21a and the bolt insertion hole 21b of the bracket member 20 in a state where the stopper rubber member 40 is mounted on the bracket member 20.

  The lower surface portion 42 is a portion that is disposed on the lower surface of the bracket member 20 (see FIGS. 8 to 10) and functions as a stopper rubber when the vibration generator is greatly displaced in the bound direction (downward in FIG. 2). It is a substantially trapezoidal shape when viewed from the bottom, and is formed in a flat plate shape with a substantially constant plate thickness. The lower surface portion 42 is disposed in parallel with the upper surface portion 41. In addition, the lower surface portion 42 is concavely provided with an upper base (a side on the upper side in FIG. 5B) forming a part of an opening 45 to be described later curved in an arc shape when viewed from the lower surface shown in FIG. Has been.

  Further, the facing distance between the inner surfaces between the lower surface portion 42 and the upper surface portion 41 is set to a dimension L. This dimension L is equal to or slightly smaller (for example, 0.5 mm) than the dimension H (see FIG. 4) which is the height dimension of the bracket member 20. Therefore, when the stopper rubber member 40 is mounted on the bracket member 20, the inner surface of the upper surface portion 41 and the inner surface of the lower surface portion 42 of the stopper rubber member 40 are respectively formed on the upper surface of the bracket tip portion 21 and the lower surface of the bracket base portion 432. Abutted.

  The pair of side surface portions 43 are disposed on both side surfaces of the bracket member 20 (see FIGS. 8 to 10), and function as a stopper rubber when the vibration generator is greatly displaced in the horizontal direction (the vertical direction in FIG. 2). And a portion (side base portion 432) that functions as a close contact portion that is in close contact with the bracket member 20 and suppresses rattling of the stopper rubber member 40, and has a substantially trapezoidal shape in side view. The plate thickness is formed in a substantially constant plate shape.

  Each of the pair of side surface portions 43 has the entire upper base (side on the upper side in FIG. 6) connected to the upper surface portion 41 in the side view shown in FIGS. 6 (a) and 6 (b). A part of the lower side in FIG. 6 (a portion on the side opposite to the tip surface portion 44) is connected to the lower surface portion. That is, the side surface portion 43 is connected to the upper surface portion 41 and is formed in a substantially rectangular shape when viewed from the side, and the side surface tip portion 431 is connected to the side surface tip portion 431 and is connected to the lower surface portion 42. A side root portion 432 which is a portion formed in a substantially triangular shape in side view is provided.

  The pair of side surface tip portions 431 are arranged to face each other in parallel with a predetermined distance therebetween, and the pair of side surface root portions 432 correspond to the shapes of both side surfaces of the bracket root portion 22 (see FIG. 3) of the bracket member 20. Thus, they are arranged to face each other so that the distance between the faces increases as the distance from the front end surface portion 44 increases. As a result, in the pair of side surface portions 43, one (FIG. 6A, right side) side surface portion 43 is linearly formed in a top view, and the other (FIG. 6A left side) side surface portion is a top view. Is bent in a substantially square shape.

  In addition, the opposing space | interval of the inner surface of a pair of side surface front-end | tip part 431 is set to the dimension F. FIG. The dimension F is larger than the dimension W (see FIG. 3) which is the width dimension of the bracket tip portion 21 of the bracket member 20. Therefore, when the stopper rubber member 40 is mounted on the bracket member 20, a predetermined gap is formed between the both side surfaces of the bracket tip portion 21 and the inner surfaces of the pair of side surface tip portions 431.

  In addition, the facing distance between the inner surfaces of the pair of side surface base parts 432 is set to a dimension that is equal to or slightly smaller than the width dimension of the bracket base part 22 of the bracket member 20 (for example, 0.5 mm). Therefore, in a state where the stopper rubber member 40 is mounted on the bracket member 20, the inner surfaces of the pair of side surface root portions 432 are in close contact with both side surfaces of the bracket root portion 22.

  Plural ridges extending in the vertical direction (the vertical direction in FIG. 6A) are formed on the outer surfaces of the pair of side surface tip portions 431, and the outer surfaces of the side surface tip portions 431 are uneven by the plurality of ridges. It is formed in a shape. This protrusion is formed over the entire vertical direction of the side end portion 431.

  On the inner surfaces of the pair of side surface root portions 431, a fitting projection 431a extending along the vertical direction is provided so as to project. The fitting protrusion 431a is formed over the entire vertical direction of the side surface root portion 431. The fitting protrusion 431 a is a part that functions as a retaining portion for preventing the stopper rubber member 40 from falling off from the bracket member 20, and is fitted into a recessed groove 21 c that is recessed in the bracket member 20. (See FIG. 9).

  As shown in FIG. 5B, the fitting protrusion 431a makes it easy to insert the bracket member 20 into the stopper rubber member 40 and makes it difficult to remove the bracket member 20 after the insertion, as shown in FIG. 5 (b) upper side surface is formed at a substantially right angle to the inner surface of the side surface tip portion 431, and the side surface opposite to the tip surface portion 44 (lower side in FIG. 5 (b)) is closer to the tip surface portion 44 side toward the tip side. Inclined so as to be close to each other.

  The front end surface portion 44 is disposed on the front end surface of the bracket member 20 (see FIGS. 8 to 10), and functions as a stopper rubber when the vibration generator is greatly displaced in the horizontal direction (left side in FIG. 2) and also serves as a stopper rubber. The member 40 is a part that regulates the displacement of the member 40 in the horizontal direction (the left-right direction in FIG. 5A), and is formed in a flat plate shape that is substantially rectangular in front view and has a substantially constant plate thickness.

  The front end surface portion 44 has an upper side continuous to the upper surface portion 41 and both side sides continuous to the side surface front end portion 431 of the side surface portion 43, and the inner surface is orthogonal to the upper and lower surface portions 41 and 42 and the inner surface of the side surface portion 43. It is formed on a flat surface.

  In addition, the space | interval between the inner surface of the front end surface part 44 and the side surface (FIG.5 (b) upper side surface) by the side of the front end surface part 44 of the fitting protrusion 431a is set to the dimension N. FIG. This dimension N is equal to or slightly larger than the dimension M (see FIG. 3A), which is the distance between the tip surface of the bracket tip 21 and the recessed groove 21c described above (for example, 0.5 mm). ) Is set. Therefore, as will be described later, when the bracket tip portion 21 of the bracket member 20 is displaced downward, a gap is formed between the tip surface of the bracket tip portion 21 and the inner surface of the tip surface portion 44 (see FIG. 12). ).

  Here, the center of the front end surface portion 44 in the width direction (left and right direction in FIG. 5B) is a circle convex toward the front end side (upper side in FIG. 5B) as shown in the bottom view of FIG. It is curved in an arc shape. Thus, a tip recess 44 a that is curved in an arc shape is formed on the inner surface of the tip surface portion 44.

  The tip recess 44a is formed in a circular arc shape whose bottom view is concentric with the upper surface insertion hole 41a, and extends over the entire top and bottom direction of the tip surface portion 44 (FIG. 5 (b) perpendicular to the paper surface). The lower surface side (the front side of FIG. 5B) that is the opposite side is formed to be open. In addition, the front-end | tip protrusion 21d (refer FIG. 3) of the bracket member 20 is fitted by this front-end | tip recessed part 44a. Further, the inner diameter of the tip recess 44a is formed to be the same as or slightly larger than the outer diameter of the tip protrusion 21d (for example, 0.5 mm).

  The tip recess 44a is provided with a second recess 44b in a predetermined range (a substantially rectangular region shown in FIG. 7) including the opening side (the lower surface side opposite to the upper surface 41). In the region where 44b is provided as a recess, the thickness dimension of the tip surface portion 44 is thinner than the remaining portion. Thereby, the water etc. which penetrate | invaded in the bolt fixing | fixed part 21a of the bracket front-end | tip part 21 can be discharged | emitted outside through the opening part 21e (refer FIG. 2).

  Here, in the stopper rubber member 40, the lower surface portion 42 is connected to only the side surface root portion 432 of the side surface portion 43, that is, the front end surface portion 44 and the side surface front end portion 431 of the side surface portion 43 are on the upper side (see FIG. 6 and the upper side of FIG. 7 is connected to the upper surface portion 41, while the lower side (the lower side of FIGS. 6 and 7) is not connected to the lower surface portion 42. As shown in FIG. 5 (b), at least the bracket tip portion of the bracket member 20 is surrounded by the upper bottom of the lower surface portion 42, the side surface tip portion 431 of the pair of side surface portions 43, and the tip surface portion 44. An opening 45 having a size that exposes the entire lower surface of 21 is formed.

  Next, a state where the stopper rubber member 40 is attached to the bracket member 20 will be described with reference to FIGS. 8 to 11. 8 is a top view of the bracket member 20 to which the stopper rubber member 40 is attached, and FIG. 9 is a bottom view of the bracket member 20 to which the stopper rubber member 40 is attached. FIG. 10 is a side view of the bracket member 20 to which the stopper rubber member 40 is attached, and FIG. 11 is a partially enlarged bottom view of the bracket member at the XI portion in FIG.

  As shown in FIGS. 8 to 11, the stopper rubber member 40 is attached to the bracket member 20 from the opening on the side opposite to the front end surface portion 44 of the stopper rubber member 40 by moving the tip end portion of the bracket tip end portion 21 of the bracket member 20. The tip end face of the inserted bracket tip end portion 21 is brought into contact with the inner surface of the tip end face portion 44 of the stopper rubber member 40.

  Accordingly, the upper surface portion 41 of the stopper rubber member 40 is disposed on the upper surface of the bracket tip portion 21 of the bracket member 20, and the upper surface of the bracket tip portion 21 is covered with the upper surface portion 41 of the stopper rubber member 40. Similarly, the front end surface portion 44 of the stopper rubber member 40 is disposed on the front end surface of the bracket front end portion 21 of the bracket member 20, and the front end surface of the bracket front end portion 21 is covered with the front end surface portion 44 of the stopper rubber member 40.

  On the other hand, in the side surface portion 41 of the stopper rubber member 40, the side surface tip portion 431 and the side surface root portion 432 are disposed on both side surfaces of the bracket tip portion 21 and the bracket root portion 22 of the bracket member 20, respectively. Both side surfaces of the bracket root portion 22 are respectively covered with the side surface tip portion 431 and the side surface root portion 432 of the stopper rubber member 40. Further, the lower surface portion 42 of the stopper rubber member 40 is disposed on the lower surface of the bracket base portion 22 of the bracket member 20, and the lower surface of the bracket base portion 22 is covered with the lower surface portion 42 of the stopper rubber member 40.

  Here, the dimension L (see FIG. 6B) between the lower surface portion 42 and the upper surface portion 41 of the stopper rubber member 40 is equal to or slightly equal to the dimension H (see FIG. 4) which is the height dimension of the bracket member 20. Therefore, when the stopper rubber member 40 is mounted on the bracket member 20, the inner surface and the lower surface portion 42 of the upper surface portion 41 of the stopper rubber member 40 are disposed on the upper surface of the bracket tip portion 21 and the lower surface of the bracket root portion 432. The inner surface of each is closely attached.

  Further, a dimension F (refer to FIG. 5B) that is an interval between the inner surfaces of the pair of side surface tip portions 431 of the stopper rubber member 40 is a dimension W that is a width dimension of the bracket tip portion 21 of the bracket member 20 (see FIG. 3), when the stopper rubber member 40 is mounted on the bracket member 20, a gap is formed between both side surfaces of the bracket tip portion 21 and the inner surfaces of the pair of side surface tip portions 431. The

  On the other hand, the facing distance between the inner surfaces of the pair of side surface base portions 432 of the stopper rubber member 40 is set to a size equivalent to or slightly smaller than the width size of the bracket base portion 22 of the bracket member 20. In the state where the stopper rubber member 40 is mounted, the inner surfaces of the pair of side surface root portions 432 are in close contact with both side surfaces of the bracket root portion 22.

  In this case, a tip protrusion 21d that protrudes from the tip surface of the bracket tip portion 21 of the bracket member 20 is fitted in the tip recess 44a that is recessed in the inner surface of the tip surface portion 44 of the stopper rubber member 40. The position of the stopper rubber member 40 in the width direction (left and right direction in FIGS. 8 and 9) with respect to the bracket member 20 is positioned. As a result, both side surfaces of the bracket tip 21 of the bracket member 20 and the pair of side tips of the stopper rubber member 40 are positioned. Both gaps formed between the inner surface of the portion 431 are defined to have the same dimension t.

  In addition, it is preferable to set the dimension t of the gap within a range of 0.25 mm or more and 1.5 mm or less. If the dimension t is set to a value smaller than 0.25 mm, a rubber mold for vulcanizing and molding the stopper rubber member 40 is required to have high dimensional accuracy, the manufacturing cost increases, and the manufacturing dimension of the stopper rubber member 40 is increased. This is because the above-described gap may not be ensured due to variations. If the dimension t is set to a value larger than 1.5 mm, the gap becomes excessive, and both side surfaces of the bracket tip 21 of the bracket member 20 are connected to the displacement regulating member 30 via the side tip 431 of the stopper rubber member 40. This is because abnormal noise is generated at the time of collision.

  In addition, the tip protrusion 21 d that protrudes from the bracket tip 21 of the bracket member 20 is fitted into the tip recess 44 a that is recessed on the inner surface of the tip surface 44 of the stopper rubber member 40. The stopper rubber member 40 with respect to the bracket tip portion 21 of the bracket member 20 is formed when a gap of a dimension t is formed between both side surfaces of the bracket tip portion 21 and the inner surfaces of the pair of side surface tip portions 431 of the stopper rubber member 40. The relative position of the side surface tip portion 431 can be maintained, and the gap between the inner surface of the side surface tip portion 431 and both side surfaces of the bracket tip portion 21 can be suppressed to one side.

  That is, the side surface tip 431 of the stopper rubber member 40 is displaced with respect to the bracket tip 21 of the bracket member 20, and the gap is biased to one side of the bracket tip 21, and the side where the gap is biased (gap If the side surface of the bracket front end portion 21 on the side where the distance is increased comes into contact with the inner surface of the displacement regulating member 30, abnormal noise is generated. On the other hand, in the present embodiment, the gap between the tip protrusion 21d and the tip recess 44a can be prevented from being biased, so that abnormal noise can be prevented from occurring.

  In this case, the tip protrusion 21d of the bracket tip 21 extends in the vertical direction (vertical direction in FIG. 10) on the tip surface of the bracket tip 21 and the tip recess 44a of the tip surface 44 Since the lower surface side (the front side in FIG. 9 and the lower side in FIG. 10) is opened, the bracket member 20 resonates at a specific frequency, and the front end side of the bracket front end portion 21 (upper side in FIG. 9, FIG. 10). When the right side) is displaced downward, the tip protrusion 21d of the bracket tip 21 can be released downward from the opening on the lower surface side of the tip recess 44a. Thereby, even when the front end protrusion 21d of the bracket front end portion 21 and the front end recess 44a of the front end surface portion 44 are fitted to prevent abnormal noise generation (that is, gap deviation), the bracket member 20 It can be suppressed that the stopper rubber member 40 follows the vertical displacement and acts as a mass body.

  Next, with reference to FIG. 12, an aspect in the case where the bracket member 20 resonates at a specific frequency will be described. FIG. 12 is a partial cross-sectional side view of the vibration isolator 100, and illustrates a state in which the vibration generator is supported and fixed to the vehicle body. However, in FIG. 12, in order to simplify the drawing and facilitate understanding, the mounting device 10 fastened and fixed to the bracket tip portion 21 of the bracket member 20 and the displacement regulating member 30 fixed to the mounting device 10. And the members on the vibration generator side that are fastened and fixed to the bracket root portion 22 of the bracket member 20 are not shown. Moreover, the amplitude of the bracket member 20 is schematically illustrated in an enlarged manner than the actual amplitude.

  As described above, the vibration isolator 100 is connected to the upper member 11 of the mount device 10 in which the upper member 11 and the lower member 12 are connected by the anti-vibration base 13 made of a rubber-like elastic body. (The bracket tip 21) is attached, the lower member 12 of the mounting device 10 is attached to the vehicle body via the attachment plate members 51 and 52, and the base side of the bracket member 20 (the bracket base portion 22) generates vibration. The vibration generating body is elastically supported on the vehicle body while attached to the body side (see FIG. 2).

  Here, the bracket tip portion 21 of the bracket member 20 is fastened and fixed to a member (for example, made of an aluminum alloy) on the vibration generator side as much as it is attached to the upper member 11 of the mount device 10 and supported by the vibration isolation base 13. Support rigidity is weaker than the bracket base 22. Therefore, when the bracket member 20 resonates at a specific frequency, the base side of the bracket base portion 22 (left side in FIG. 12) is the base point, and the front end side of the bracket front end side 21 (right side in FIG. 12) has the maximum amplitude. In an aspect, the bracket member 20 is vibrated up and down.

  In this case, in the vibration isolator 100, the bracket tip portion 21 of the bracket member 20 is formed in a rectangular parallelepiped shape having a rectangular cross section, and the stopper rubber member 40 attached to the bracket tip portion 21 having the rectangular parallelepiped shape is at least the bracket tip portion 21. The opening 45 is formed on the lower surface side so that the entire lower surface is exposed, and between the inner surface of the side end portion 431 of the stopper rubber member 40 and both side surfaces of the bracket end portion 21 of the bracket member 20. A gap having a dimension t (see FIG. 11) is formed.

  Therefore, when the bracket member 20 resonates at a specific frequency and the distal end side of the bracket distal end portion 21 is displaced downward (lower side in FIG. 12), the opening formed on the lower surface side of the stopper rubber member 40 45, the lower surface side (lower side in FIG. 12) of the bracket tip portion 21 of the bracket member 20 can be released downward. In this case, the bracket front end portion 431 that is displaced downward is formed by a gap having a dimension t formed between both side surfaces of the bracket front end portion 21 of the bracket member 20 and the inner surface of the side surface front end portion 431 of the stopper rubber member 40. Transmission of force from both side surfaces to the inner surface of the side end portion 431 can be suppressed.

  Thereby, it is possible to displace the bracket member 20 downward while suppressing the stopper rubber member 40 from following the bracket member 20, and it is possible to reduce the stopper rubber member 40 from acting as a mass pair. That is, while maintaining the position of the stopper rubber member 40, only the bracket tip portion 21 of the bracket member 20 is easily displaced downward, so that the inner surface (lower side surface in FIG. 12) of the upper surface portion 41 of the stopper rubber member 40 and the bracket member A gap can be provided between the upper surface of the 20 bracket tips 21 (upper side surface in FIG. 12).

  On the other hand, when the front end side of the bracket front end portion 21 is displaced upward (upper side in FIG. 12), the upper surface of the bracket front end portion 21 that is displaced upward collides with the inner surface of the upper surface portion 41 of the stopper rubber member 40. As a result, an input in the direction opposite to the displacement can be relatively applied from the upper surface portion 41 of the stopper rubber member 40 to the bracket tip portion 21 of the bracket member 20, so that the vibration of the bracket member 20 can be attenuated. it can.

  As described above, the vibration isolator 100 can easily displace only the bracket tip portion 21 of the bracket member 20 downward, thereby suppressing the stopper rubber member 40 from acting as a mass body, and the stopper rubber member. Since the vibration of the bracket member 20 can be attenuated by the input from 40, the inertance can be reduced.

  In addition, if the inertance can be reduced as described above, it is not necessary to provide the bracket member 20 with a dynamic damper for substituting the vibration energy of the bracket member 20, so that the product cost is reduced accordingly. be able to.

  Here, the stopper rubber member 40 suppresses unnecessary rattling of the stopper rubber member 40 by bringing the inner surface of the side surface root portion 432 into close contact with the bracket root portion 22 of the bracket member 20 as described above. In this case, the portion where the stopper rubber member 40 and the bracket member 20 are in close contact with each other is on the base side of the bracket member 20 (the bracket base portion 22), that is, on the side where the amplitude is reduced. It is possible to efficiently suppress rattling of the stopper rubber member 40 while suppressing the stopper rubber member 40 from following and acting as a mass body.

  Next, with reference to FIG. 13, the result of the impact test of the vibration isolator 100 will be described. FIG. 13 is a graph showing the results of the impact test, showing the change in inertance [dB] with respect to frequency [Hz].

  In the impact test, the stopper rubber member 40 is attached to the bracket member 20, the bracket base portion 22 of the bracket member 20 is fastened and fixed to the vehicle body side, and the bracket tip portion 21 of the bracket member 20 is attached to the upper member 11 of the mount device 10. The bolt B is fastened and fixed (see FIG. 2), and the mount device 10 is suspended to be in a free vibration state, and the upper surface of the head of the bolt B (upper side surface in FIG. 2) is hit with an impulse hammer to cause free damping vibration. . By detecting this free vibration damping vibration with an acceleration pickup fixed to the head of the bolt B, a change in inertance with respect to frequency is measured. The inertance is calculated as acceleration a / hitting force F from the hitting force F measured by the impulse hammer and the acceleration a measured by the acceleration pickup.

  In FIG. 13, the experimental result of “invention product” is shown by a solid line, and the experimental result of “conventional product” is shown by a broken line. Here, the “invention product” corresponds to the vibration isolator 100 in the present embodiment, and the “conventional product” is a pair of stopper rubber members 40 with respect to the vibration isolator 100 that is the “invention product”. The dimension F (see FIG. 5B), which is the distance between the inner surfaces of the side surface tip portion 431, is reduced to eliminate the gap between both side surfaces of the bracket tip portion 21 and the side surface tip portion 431 (size t). = 0, see FIG. 11). That is, the “conventional product” has the same configuration as the “invention product” except that the facing distance between the inner surfaces of the side surface tip portion 431 is reduced.

  As shown in FIG. 13, as a result of measuring the acceleration of the bracket member 20 by the excitation of the impulse hammer, the inertance of the “invention product” is reduced from the inertance of the “conventional product” in the frequency range of about 700 Hz to about 800 Hz. The maximum reduction amount was about 10 dB at a frequency of about 750 Hz. By reducing the resonance vibration of the bracket member 20 in such a frequency region, it is possible to reduce high-speed booming noise in the vehicle interior caused by the resonance vibration.

  Next, a second embodiment will be described with reference to FIGS. In 1st Embodiment, although the recessed groove 21c and the fitting protrusion 431a demonstrated the case where it forms in the front end side (the bracket front-end | tip part 21 and the side surface front-end | tip part 431) of the bracket member 20 and the stopper rubber member 40, The recessed groove 2021c and the fitting protrusion 2431a in the second embodiment are formed on the base side of the bracket member 2020 and the stopper rubber member 2040 (the bracket root portion 2022, the upper surface root portion 2041, and the lower surface portion 42). In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 14A is a top view of the bracket member 2020 in the second embodiment, and FIG. 14B is a side view of the bracket member 2020 as viewed in the direction of arrow XIVb in FIG.

  The bracket member 2020 in the second embodiment is configured to include a bracket tip portion 2021 and a bracket root portion 2022 in the same manner as the bracket member 20 in the first embodiment. The bracket tip portion 2021 has the same configuration as the bracket tip portion 21 in the first embodiment except that the recessed groove 21c is not formed and the entire area of both side surfaces is a flat surface. Since the configuration is the same as that of the bracket root portion 22 in the first embodiment except that the recessed groove 2021c is recessed on the upper surface and the lower surface, description thereof will be omitted.

  The recessed groove 2021c is a recessed groove formed in a U-shaped cross section. The recessed groove 2021c is recessed on the upper surface and the lower surface of the bracket base portion 2022 (one upper surface and lower surface in FIG. 14 (b)). It extends in the left-right direction (FIG. 14A left-right direction) from one side surface of the root portion 2022 to the other side surface. The distance between the front end surface of the bracket front end portion 2021 (surface formed as a flat surface) and the side surface (upper side surface in FIG. 14A) of the recessed groove 2021c on the bracket front end portion 2021 side is the dimension P. Is set.

  FIG. 15A is a top view of the stopper rubber member 2040 in the second embodiment, and FIG. 15B is a bottom view of the stopper rubber member 2040. FIG. 16 is a cross-sectional view of the stopper rubber member 2040 taken along line XVI-XVI in FIG.

  The stopper rubber member 2040 according to the second embodiment is provided with a fitting protrusion 431a on the inner surface of the side surface tip 2431 and a point further provided with an upper surface root portion 2041 with respect to the stopper rubber member 40 according to the first embodiment. The fitting protrusions 2431a are formed on the inner surfaces of the upper surface base portion 2041 and the lower surface 42, respectively, in that the entire area of both inner surfaces is a flat surface, the side surface root portion 2432 is formed in a rectangular shape in side view. Except for the point formed, the other parts have the same configuration as that of the stopper rubber member 40 in the first embodiment, and thus the description thereof is omitted.

  The upper surface root portion 2041 is a portion disposed on the upper surface of the bracket root portion 2022 of the bracket member 2020. The upper surface root portion 2041 is connected to the upper surface portion 41 and the pair of side surface root portions 2432 and has the same thickness dimension ( 16 (vertical dimension in FIG. 16), and is arranged to face the lower surface 42 in parallel.

  Therefore, since the facing distance between the inner surfaces between the upper surface root portion 2041 and the lower surface portion 42 is set to the dimension L, the inner surfaces of the upper surface root portion 2041 and the inner surfaces of the lower surface portion 42 are provided on the upper surface and the lower surface of the bracket root portion 432. The stopper rubber member 2040 is mounted on the stopper member 20 in a state in which the stopper rubber members 20 are in contact with each other, whereby the stopper rubber member 40 is brought into close contact with the bracket member 20 and rattling can be suppressed.

  The fitting protrusion 2431a is a part that functions as a retaining portion for preventing the stopper rubber member 2040 from falling off from the bracket member 2020 by fitting into the recessed groove 2021c that is recessed in the bracket member 2020. Yes, it protrudes from the inner surface of the upper surface root portion 2041 and the inner surface of the lower surface 42 and extends in the left-right direction (the left-right direction in FIG. 15 and the vertical direction in FIG. 16).

  As shown in FIG. 16, the fitting protrusion 2431a facilitates insertion of the bracket member 2020 into the stopper rubber member 2040 and makes it difficult to remove it after insertion, as shown in FIG. Side surfaces of the upper surface base portion 2041 and the lower surface 42 are formed at a substantially right angle, and the side surface on the opposite side (left side in FIG. 16) from the front end surface portion 44 is inclined so that the front end side is closer to the front end surface portion 44 side. Is formed.

  Further, the distance between the inner surface of the tip surface portion 44 and the side surface (right side surface in FIG. 16) of the fitting projection 2431a on the tip surface portion 44 side is set to a dimension Q. This dimension Q is equal to or slightly larger than the dimension P (see FIG. 14A), which is the distance between the tip surface of the bracket tip 2021 and the recessed groove 2021c described above (for example, 0.5 mm). ) Is set. Therefore, when the bracket front end 2021 of the bracket member 2020 is displaced downward, a gap is formed between the front end surface of the bracket front end 2021 and the inner surface of the front end surface 44 (see FIG. 12).

  FIG. 17 is a partial sectional side view of the bracket member 2020 to which the stopper rubber member 2040 is attached. As shown in FIG. 17, when the stopper rubber member 2040 is attached to the bracket member 2020, the fitting protrusion 2431a is fitted into the recessed groove 2021c, and the fitting causes the bracket rubber 2020 to move from the bracket member 2020 of the stopper rubber member 2040. Is prevented from falling off.

  Here, since the bracket member 2020 is formed substantially the same as the bracket member 20 in the first embodiment, the front end side of the bracket front end side 2021 has the maximum amplitude with the base side of the bracket base portion 2022 as a base point. Then, it is vibrated up and down (see FIG. 12).

  In this case, in the second embodiment, the fitting protrusion 2431a and the recessed groove 2021c reduce the amplitude of the upper surface root portion 2041 and the lower surface 42 of the stopper rubber member 2040 and the bracket root portion 2022 of the bracket member 2020. Each part is formed.

  Therefore, when the bracket tip 2020 of the bracket member 2020 is released downward from the opening 45 of the stopper rubber member 2040, and the stopper rubber member 2040 is prevented from following the vertical displacement of the bracket member 2020 and acting as a mass body. Therefore, it is possible to reduce the inhibition effect due to the fitting between the fitting protrusion 2431a and the recessed groove 2021c. Further, it is easy to maintain the fitting state between the fitting protrusion 2431a and the recessed groove 2021c, and the stopper rubber member 2040 can be reliably suppressed from being detached from the bracket member 2020.

  Next, a third embodiment will be described with reference to FIG. In 1st Embodiment, although the recessed groove 21c and the fitting protrusion 431a demonstrated the case where it forms in the front end side (the bracket front-end | tip part 21 and the side surface front-end | tip part 431) of the bracket member 20 and the stopper rubber member 40, The recessed groove 3021c and the fitting protrusion 3431a in the third embodiment are formed on the base side (the bracket base part 3022 and the side base part 3432) of the bracket member 3020 and the stopper rubber member 3040. In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and the description is abbreviate | omitted.

  FIG. 18A is a top view of the bracket member 3020 in the third embodiment, and FIG. 18B is a cross-sectional view of the stopper rubber member 3040 in the third embodiment. FIG. 18 (b) corresponds to FIG. 6 (b).

  The bracket member 3020 in the third embodiment includes a bracket tip portion 3021 and a bracket root portion 3022 in the same manner as the bracket member 20 in the first embodiment. The bracket tip portion 3021 has the same configuration as the bracket tip portion 21 in the first embodiment except that the recessed groove 21c is not formed and the entire area of both side surfaces is a flat surface. Since the configuration is the same as that of the bracket root portion 22 in the first embodiment except that the recessed portions 3021c are respectively recessed on both side surfaces, description thereof will be omitted.

  The recessed portion 3021c is a recessed portion that is formed in a U-shaped cross section and is formed in a substantially oval shape when viewed from the front, and is formed on both side surfaces of the bracket root portion 3022 (FIG. 18 (a) front side surface and back side surface). Each one is recessed. The distance between the front end surface of the bracket front end portion 3021 (surface formed as a flat surface) and the side surface on the bracket front end portion 3021 side of the recessed portion 3021c (right side surface in FIG. 18A) is the dimension R. Is set.

  In the stopper rubber member 3040 in the third embodiment, the fitting protrusion 431a is not formed on the inner surface of the side end portion 3431, and the entire area of both inner surfaces is flat compared to the stopper rubber member 40 in the first embodiment. The rest of the configuration is the same as that of the stopper rubber member 40 in the first embodiment, except that the surface is a surface and the fitting protrusions 3431a are formed on the inner surfaces of the pair of side surface root portions 3432, respectively. Therefore, the description thereof is omitted.

  The fitting protrusion 3431a is a part that functions as a retaining portion for preventing the stopper rubber member 3040 from falling off from the bracket member 3020 by fitting into the recessed portion 3021c that is recessed in the bracket member 3020. Yes, it is formed as a substantially oval projection in front view that projects from the inner surface of the side surface root portion 3432.

  Note that the fitting protrusion 3431a has a distal end surface portion that is easy to insert the bracket member 3020 into the stopper rubber member 3040 and is difficult to come off after insertion, as in the first and second embodiments. The side surface on the 44th side (right side in FIG. 18) is formed substantially perpendicular to the inner surface of the side surface root portion 3432, and the side surface on the opposite side (left side in FIG. 18) from the front end surface portion 44 is closer to the front end surface portion 44 side. It is formed to be inclined.

  In addition, the distance between the inner surface of the tip surface portion 44 and the side surface (right side surface in FIG. 18) of the fitting projection 3431a on the tip surface portion 44 side is set to a dimension S. This dimension S is set to a dimension equivalent to or slightly larger than the dimension R (for example, 0.5 mm), which is the distance between the tip surface of the bracket tip part 3021 and the recessed part 3021c. Therefore, when the bracket tip portion 3021 of the bracket member 3020 is displaced downward, a gap is formed between the tip surface of the bracket tip portion 3021 and the inner surface of the tip surface portion 44 (see FIG. 12).

  As described above, in the third embodiment, the fitting protrusion 3431a and the recessed portion 3021c are respectively provided in the portions where the amplitude is reduced, that is, the side surface root portion 3432 of the stopper rubber member 3040 and the bracket root portion 3022 of the bracket member 3020. Is formed.

  Therefore, as in the case of the second embodiment, the bracket tip 3021 of the bracket member 3020 is released downward from the opening 45 of the stopper rubber member 3040, and the stopper rubber member 3040 follows the vertical displacement of the bracket member 3020. When suppressing the action as a mass body, it is possible to reduce that the suppression effect is inhibited by the fitting between the fitting protrusion 3431a and the recessed portion 3021c. Further, it is easy to maintain the fitting state between the fitting protrusion 3431a and the recessed portion 3021c, and it is possible to reliably suppress the stopper rubber member 3040 from being detached from the bracket member 3020.

  Further, by fitting the fitting protrusion 3431a and the recessed recess 3021c on the base side (the portion where the amplitude is reduced) of the bracket member 3020 in this way, the extension length (FIG. 18 (a) and Even when the length in FIG. 18B is shortened, the fitting state can be easily maintained, and the stopper rubber member 3040 can be prevented from being detached from the bracket member 3020. As a result, by reducing the extension length of the fitting protrusion 3431a and the recessed recess 3021c, the amount of rubber-like elastic body necessary for vulcanizing the stopper rubber member 3040 can be reduced, and the material The cost can be reduced, and the recessed amount of the bracket member 3020 can be reduced to increase its rigidity.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values given in the above embodiments are merely examples, and other numerical values can naturally be adopted. In addition, it is naturally possible to apply a part or all of the components described in the above embodiments to other embodiments.

  In each of the above-described embodiments, the case where the entire inner surfaces of the side surface base portions 432, 2432, and 3432 are in close contact with both side surfaces of the flange base portions 22, 2022, and 3022 has been described. The range can be adjusted as appropriate. That is, a gap may be provided between a part of the inner surfaces of the side surface root portions 432, 2432, 3432 on the tip surface portion 44 side and both side surfaces of the flange root portions 22, 2022, 3022.

  In particular, in the second embodiment, a range in which a gap is provided between both side surfaces of the flange base portion 2022 may be the entire inner surface of the side surface root portion 2432. This is because the bracket member 2020 can be sandwiched between the inner surface of the upper surface root portion 2041 and the inner surface of the lower surface 42 even if the gap is provided in this way, and rattling of the stopper rubber member 2040 can be suppressed. In this case, when the bracket member 2020 resonates, the problem that the stopper rubber member 40 follows and acts as a mass body can be efficiently suppressed by expanding the above-described range in which the gap is provided.

  In the second embodiment, the case where the fitting protrusion 2431a is provided on both inner surfaces of the upper surface root portion 2041 and the lower surface 42 has been described. However, the present invention is not limited to this, and either the upper surface root portion 2041 or the lower surface 42 is provided. You may provide only in one inner surface. This is because, in the case of the second embodiment, the bracket root portion 2042 of the bracket member 2020 can be sandwiched together with the lower surface portion 42 and the side surface root portion 2432 by providing the upper surface root portion 2041 and can be firmly adhered. Thereby, it can suppress that the stopper rubber member 2040 acts as a mass body, and can reduce the usage-amount of a rubber-like elastic body, and can aim at reduction of material cost. Moreover, the rigidity can be improved because the recessed amount of the recessed groove 2021c to the bracket member 2020 decreases.

  In the first and second embodiments, the case where the fitting protrusions 431a and 2431a and the recessed grooves 21c and 2021c are continuously provided up to the edge has been described. However, the present invention is not necessarily limited thereto. As in the case of the third embodiment, it may be partially formed (projected and recessed). Similarly, in the third embodiment, the case where the fitting protrusion 3431a and the recessed groove 3021c are partially provided has been described. However, the present invention is not necessarily limited to this, and the first and second embodiments are not necessarily limited thereto. As in the case of the form, it may be formed (projected and recessed) continuously to the edge.

  In each of the above embodiments, the case has been described in which the fitting protrusions 431a, 2431a, 3431a are protruded from the stopper rubber member 40, and the recessed grooves 21c, 2021c, 3021c are recessed in the bracket member 20. However, the present invention is not necessarily limited to this, and protrusions corresponding to the fitting protrusions 431a, 2431a, 3431a protrude from the bracket member 20, and recesses corresponding to the recessed grooves 21c, 2021c, 3021c are provided as stopper rubber members. 40 may be recessed.

  Although not described in the above embodiments, the dimensions N, Q and S in the stopper rubber members 40, 2040 and 3040 are larger than the dimensions M, P and R in the bracket members 20, 2020 and 3020. In this case, it is preferable to set the difference (ie, NM, QP, and SR) within the same range (0.25 mm to 1.5 mm) as the dimension t. By setting in this range, it is possible to reduce the manufacturing cost, secure the gap, and suppress the generation of abnormal noise as in the case of the dimension t.

DESCRIPTION OF SYMBOLS 1 Anti-vibration apparatus 10 Mount apparatus 11 Upper member 12 Lower member 13 Anti-vibration base | substrate 20,2020,3020 Bracket member 21,2021,3021 Bracket front-end | tip part 21c, 2021c Recessed groove (recessed part)
3021c Concave portion 21d Tip protrusions 22, 2022, 3022 Bracket root portion 30 Displacement regulating member 40, 2040, 3040 Stopper rubber member 41 Upper surface portion (part of tip rubber portion)
2041 Top surface root part (part of root rubber part)
42 Bottom surface (part of the base rubber)
431, 2431, 3431 Side tip (part of tip rubber)
431a Fitting protrusions 432, 2432, 3432 Side surface root portion (a part of the root rubber portion)
2431a, 3431a Fitting protrusion 44 Tip surface part (part of tip rubber part)
44a Tip recess 45 Opening

Claims (3)

A lower member attached to a vehicle body, an upper member disposed at an upper side of the lower member, and an anti-vibration base configured by connecting the upper member to the lower member and made of a rubber-like elastic body; A mounting device having
A bracket member whose tip side is attached to the upper surface of the upper member of the mounting device and whose root side is attached to the vibration generator side;
A displacement regulating member that surrounds the distal end side of the bracket member and is fixed to the lower member of the mounting device;
A vibration isolator comprising: a stopper rubber member that is mounted from the front end side of the bracket member and covers the outer surface of the bracket and is made of a rubber-like elastic body.
The bracket member is formed in a rectangular parallelepiped shape with a rectangular cross section, and a bracket front end portion attached to the upper surface of the upper member of the mount device, and a bracket front end portion connected to the bracket front end portion and attached to the vibration generator side. A bracket base, and
The stopper rubber member covers the outer surface of the bracket tip portion of the bracket member and functions as a stopper rubber when the vibration generating body is largely displaced, and is provided continuously with the tip rubber portion and the bracket. comprising a base rubber portion that acts as an adhesion portion for covering the outer surface of the bracket base portion of the member suppresses rattling in close contact with the outer surface of the bracket base portion,
The bracket front end includes a bolt fixing portion that is recessed from the upper surface to the lower surface, and a bracket opening that is formed at a connection portion between the bottom surface of the bolt fixing portion and the front end surface of the bracket front end. ,
The tip rubber portion, together comprises a distal end surface portion for connecting the pair of side portions and an upper surface portion, and an opening which is opened and formed to a size to expose the entire lower surface of the bracket tip end portion of the bracket member, the tip A gap is formed between the inner surface of the rubber part and both side surfaces of the bracket tip of the bracket member ,
A second recess is formed in the inner surface of the tip surface portion at a position corresponding to the bracket opening including the opening, and the thickness dimension of the tip surface portion is a region where the second recess is provided. There vibration damping device, characterized that you have been thinner relative to the remainder. The bracket member includes a recessed portion that is recessed on an outer surface of the bracket base portion,
The stopper rubber member according to claim 1 Symbol placing the vibration isolating device, comprising a fitting protrusion fitted to the recessed portion of the projecting from the inner surface of the base rubber portion and the bracket base portion. The bracket member includes a front end protrusion that protrudes from the front end surface of the bracket front end and extends along the vertical direction.
The stopper rubber member according to claim 1 or 2, characterized in that it comprises a tip recess lower surface is opened while being recessed in the inner surface of the tip rubber portion fitted to the tip protrusion of the bracket tip Anti-vibration device.

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