JP7121719B2 - Cylindrical anti-vibration device with bracket - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bracket-equipped cylindrical vibration isolator used for an automobile engine mount or the like.

2. Description of the Related Art Conventionally, when a tubular mount body is attached to a vehicle, an outer bracket having a tubular portion into which the tubular mount body is press-fitted and fixed has been employed. For example, it is disclosed in Japanese Utility Model Laid-Open No. 6-054938 (Patent Document 1).

By the way, the axial length of the outer cylindrical member is designed according to the axial free length of the main rubber elastic body, which is determined by the required characteristics, and the pull-out resistance due to press-fitting and fixing to the cylindrical portion. On the other hand, the outer tubular member is relatively thin for manufacturing and processing reasons, and it may be difficult to achieve the required strength characteristics by itself. ing. In this way, the outer tubular member and the tubular portion of the outer side bracket are fixed to each other by press-fitting, so that it is considered that they complement each other functionally so as to exhibit their intended functions. .

Japanese Utility Model Laid-Open No. 6-054938

However, as a result of examination by the present inventors, it has been found that the bracket-equipped tubular vibration isolator having a conventional structure in which the entire outer tubular member is press-fitted and fixed to the tubular portion of the outer-side bracket, as described in Patent Document 1, , the knowledge that the functional mutual complementation of the outer tubular member and the tubular portion is not yet sufficient. In particular, in recent years, there has been a demand for weight reduction of members from the viewpoint of reducing environmental burden including improvement of fuel efficiency of vehicles. It became clear that the weight reduction of the member can also be achieved at the same time.

The problem to be solved by the present invention is to improve the functional mutual complementation of the outer tubular member and the tubular portion of the outer side bracket, and at the same time achieve weight reduction. To provide a type vibration isolator.

Hereinafter, preferred embodiments for understanding the present invention will be described. can be recognized and employed as independently as possible, and can also be employed in combination with any of the components described in other aspects as appropriate. Accordingly, the present invention can be implemented in various alternatives without being limited to the embodiments described below.

A first aspect has a tubular mount main body in which an inner member and an outer tubular member are connected by a main rubber elastic body, a tubular portion in which the outer tubular member is press-fitted and fixed, and an outer peripheral surface of the tubular portion. and an outer side bracket having a mounting portion projecting outward, wherein the cylindrical mount body limits relative displacement between the inner member and the outer cylindrical member in the direction perpendicular to the axis. A pair of axially-direct stoppers are partially provided in the circumferential direction, while the outer-side bracket has a pair of axially-directed stoppers on both sides in the circumferential direction at the axial ends of the cylindrical portion. A cutout portion is provided, and the pair of cutout portions are both positioned outside the mounting portion in the circumferential direction, and the axial length of the tubular portion is shortened by the pair of cutout portions. , the outer cylindrical member is exposed to the outer circumference through the cutouts .

According to the tubular vibration isolator with bracket constructed according to this mode, the axial length of the tubular portion of the outer side bracket is increased at the circumferential position corresponding to the axial stopper, so that the tubular The reinforcing function required for the part is realized. Furthermore, the press-fit fixing force is efficiently ensured at the portion of the cylindrical portion having a relatively large axial length. Therefore, even if the outer tubular member is exposed by providing a cutout portion in the tubular portion at a position away from the axis-perpendicular stopper in the circumferential direction, the load bearing performance against the stopper load and the press-fit fixation of the tubular mount main body to the tubular portion can be improved. The intended function such as securing of force (loosening resistance) is fully exhibited. In this way, by improving the functional mutual complementation of the tubular portion of the outer tubular member, it becomes possible to reduce the weight of the outer side bracket by forming the notch portion.

According to a second aspect, in the tubular vibration-damping device with a bracket according to the first aspect, the notches are formed at both ends in the axial direction of the tubular portion of the outer side bracket.

According to the tubular vibration-damping device with a bracket constructed according to this aspect, the notch is formed at both ends of the tubular portion of the outer bracket in the axial direction, thereby further reducing the weight of the outer bracket. is planned. In addition, since the notches are provided on both sides of the tubular portion in the axial direction, the press-fitting position of the outer tubular member with respect to the tubular portion becomes a position close to the center in the axial direction, and the fixing force due to the press-fitting is well-balanced in the axial direction. demonstrated.

A third aspect is the tubular vibration-damping device with bracket according to the first or second aspect, wherein the axial length of the outer tubular member is substantially constant over the entire circumference. .

According to the tubular vibration isolator with bracket constructed according to this aspect, for example, the directivity of the outer tubular member in the circumferential direction can be eliminated, which facilitates the manufacture of the tubular mount main body. Since the axial length of the outer tubular member is substantially constant in the circumferential direction, even if the outer side bracket is provided with a notch, the fixing area of the main rubber elastic body to the outer tubular member can be secured. be able to.

A fourth aspect is the tubular vibration isolator with bracket according to any one of the first to third aspects, wherein the tubular portion of the outer side bracket is thicker than the outer tubular member. It is what is done.

According to the tubular vibration damping device with bracket constructed according to this mode, the tubular portion of the outer side bracket is relatively thick, so that the portion where the axis-perpendicular stopper is provided has the tubular portion. Advantageously, the reinforcement of the load bearing performance is realized, and the damage to the outer cylindrical member and the cylindrical portion due to the input of the stopper load is avoided.

A fifth aspect is the tubular vibration isolator with a bracket according to any one of the first to fourth aspects, wherein the notch portion extends from the main rubber elastic body to the outer tubular member in the circumferential direction. The effective axial free length of the main rubber elastic body connecting the inner member and the outer tubular member is formed at a position including the fixed portion, and the notch portion in the tubular portion of the outer side bracket is It is made longer than the axial length of the formed portion.

According to the tubular vibration isolator with bracket constructed according to this aspect, even if the tubular portion of the outer side bracket is provided with the notch, the outer tubular member has the main rubber up to the portion exposed to the outer periphery through the notch. By fixing the elastic body, the fixing area of the main rubber elastic body to the outer cylindrical member is ensured. In addition, it is possible to secure a large free length in the axial direction of the main rubber elastic body while reducing the weight of the main rubber elastic body by means of the notch, so that vibration isolation characteristics such as spring characteristics and damping characteristics of the main rubber elastic body can be adjusted with a large degree of freedom. can be set. In addition, according to a sixth aspect, in the tubular vibration isolator with a bracket according to any one of the first to fifth aspects, both end portions in the circumferential direction of the notch are smoothly curved without corners. It is composed of a surface and is smoothly continuous with the axial end surface of the portion of the cylindrical portion that is outside the notch. A seventh aspect is the tubular vibration isolator with a bracket according to any one of the first to sixth aspects, wherein the main rubber elastic body has an elastic body extending from the inner member toward the outer tubular member. A pair of connecting portions extending obliquely downward are provided on both sides in the left-right direction, and the axis-perpendicular stoppers limit the amount of relative displacement in the vertical direction between the inner member and the outer cylindrical member, The outer side bracket is provided with the mounting portion in a portion in the circumferential direction, and is provided with the notch portion in both side portions in the left-right direction at positions displaced from the mounting portion in the circumferential direction. .

According to the present invention, in the tubular vibration-damping device with a bracket, it is possible to improve the functional mutual complementation of the outer tubular member and the tubular portion of the outer side bracket, and at the same time achieve weight reduction. .

1 is a perspective view showing an engine mount as a first embodiment of the invention; FIG. FIG. 2 is a perspective view showing the engine mount of FIG. 1 from another angle; Front view of the engine mount shown in FIG. A plan view of the engine mount shown in FIG. Right side view of the engine mount shown in FIG. VI-VI sectional view of FIG. VII-VII cross-sectional view of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 7 show an automobile engine mount 10 as a first embodiment of a tubular vibration damping device with a bracket constructed according to the present invention. The engine mount 10 has a structure in which a cylindrical mount body 12 is attached to an outer side bracket 14 . Furthermore, the cylindrical mount body 12 has a structure in which the inner member 16 and the outer cylindrical member 18 are connected by the main rubber elastic body 20 . In the following description, as a general rule, the up-down direction means the up-down direction in FIG. 3, and the left-right direction means the left-right direction in FIG.

As shown in FIGS. 6 and 7, the inner member 16 is a hard member made of metal or synthetic resin and has a substantially cylindrical shape. The inner member 16 has a substantially constant length dimension in the axial direction over the entire circumference. The inner member 16 has a substantially constant thickness dimension over the entire circumference. The specific shape of the inner member 16 is not particularly limited, and may be, for example, a solid shaft shape such as a cylindrical shape, or a polygonal tube shape other than a cylinder.

The outer tubular member 18 is a hard member made of metal or synthetic resin. The outer cylindrical member 18 has a substantially cylindrical shape with a larger diameter than the inner member 16 and is thinner than the inner member 16 . Both the inner diameter dimension and the outer diameter dimension of the outer tubular member 18 are substantially constant over the entire length in the axial direction. The outer cylindrical member 18 has a substantially constant thickness over the entire circumference. The axial length dimension of the outer cylindrical member 18 is substantially constant over the entire circumference. As shown in FIG. 6, the outer tubular member 18 has a smaller axial length dimension than the inner member 16 . The material for forming the outer tubular member 18 is preferably a metal such as iron in consideration of press-fitting and fixing the outer side bracket 14 to a tubular portion 34, which will be described later.

As shown in FIG. 7, the inner member 16 is inserted into the outer tubular member 18, and the main rubber elastic body 20 is provided between the inner member 16 and the outer tubular member 18 in the radial direction. The main rubber elastic body 20 includes an inner covering portion 22 fixed to the outer peripheral surface of the inner member 16, an outer covering portion 24 fixed to the inner peripheral surface of the outer tubular member 18, and the inner covering portion 22 and the outer covering portion. A pair of connecting portions 26, 26 for connecting 24 to each other are provided.

The connecting portions 26, 26 are provided on both sides in the left-right direction with respect to the inner member 16 (inner covering portion 22). The connecting portions 26 , 26 straddle between the inner covering portion 22 and the outer covering portion 24 and extend substantially in the radial direction. The connecting portions 26 , 26 have elastic central axes extending in the longitudinal direction (substantially radial direction) that are gradually inclined downward from the inner covering portion 22 toward the outer covering portion 24 . The connecting portions 26 , 26 are integrally formed with the inner covering portion 22 and the outer covering portion 24 .

A first hollow hole 28 is formed on the upper side of the connecting portion 26 so as to penetrate therethrough in the axial direction. A second hollow hole 30 is formed on the lower side of the connecting portion 26 so as to extend therethrough in the axial direction.

A pair of stopper rubbers 32 , 32 are provided on the outer covering portion 24 of the main rubber elastic body 20 . The stopper rubbers 32 , 32 are partially provided in the circumferential direction, and have a projection shape projecting from the outer covering portion 24 toward the inner covering portion 22 . The stopper rubbers 32, 32 are arranged to face each other with the inner covering portion 22 (the inner member 16) interposed therebetween in the vertical direction. The stopper rubbers 32, 32 are provided at positions separated from the inner covering portion 22 by a predetermined distance in the vertical direction. The stopper rubbers 32, 32 are narrowed in the circumferential direction and narrowed in the axial direction toward the protruding tip end side, and have a tapered shape. A protruding tip surface of the stopper rubber 32 is a substantially flat surface extending substantially perpendicularly to the vertical direction.

The upper stopper rubber 32 protrudes into the first hollow 28 and the lower stopper rubber 32 protrudes into the second hollow 30 . A stopper clearance (gap) between the upper stopper rubber 32 and the inner covering portion 22 (inner member 16 ) is provided by a first hollow hole 28 . A stopper clearance between the lower stopper rubber 32 and the inner covering portion 22 is provided by the second hollow hole 30 .

The tubular mount body 12 having such a structure is attached to the outer side bracket 14 . The outer side bracket 14 is a highly rigid member made of metal, synthetic resin, or the like. The outer side bracket 14 has a tubular portion 34 . The tubular portion 34 has a substantially cylindrical shape as a whole, and the inner peripheral surface thereof is a fitting surface 36 having a substantially circular cross section. The tubular portion 34 is thicker than the outer tubular member 18 and has a large deformation rigidity.

A plurality of notches 38 are formed at the axial end of the cylindrical portion 34, as shown in FIGS. The notch 38 has a recessed shape that opens to the axial end surface of the cylindrical portion 34 . The notch portion 38 is formed so as to penetrate the cylindrical portion 34 in the radial direction. The notch 38 is partially provided in the left and right sides of the cylindrical portion 34 in the circumferential direction. The inner surface of the notch 38 has a substantially planar central portion in the circumferential direction, and has smooth curved surfaces with no corners at both end portions in the circumferential direction. It is smoothly continuous with the axial end face of the part.

The notch portions 38 are formed at both ends of the tubular portion 34 in the axial direction. In this embodiment, the cutouts 38, 38 on both sides in the axial direction are formed in substantially symmetrical shapes. The tubular portion 34 has a portion (a short portion 42 to be described later) formed with the notches 38 in the circumferential direction and a portion (a long portion to be described later) that is outside the notches 38 in the circumferential direction. 40) in the axial direction.

As shown in FIGS. 2 and 5, the cylindrical portion 34 has a notch portion 38 so that the length dimension in the axial direction changes in the circumferential direction. That is, the cylindrical portion 34 is partially shortened in the circumferential direction by the cutout portion 38, and the axial length of the portion formed with the cutout portion 38 in the circumferential direction is is shorter than the axial length of the portion outside the notch 38 . As a result, the cylindrical portion 34 has a long portion 40 having a long axial length at a portion outside the notch 38 in the circumferential direction, and the portion at which the notch 38 is formed in the circumferential direction is A short portion 42 having a short axial length is formed.

By providing such a notch portion 38, the weight of the outer side bracket 14 including the tubular portion 34 is reduced. The length dimension of the long portion 40 in the axial direction is longer than the effective free length in the axial direction of the connecting portions 26, 26 of the main rubber elastic body 20, and the length dimension of the short portion 42 in the axial direction is shorter than the effective free length in the axial direction of the connecting portions 26, 26 of the main rubber elastic body 20. As shown in FIG.

The outer side bracket 14 has a mounting portion 44 . As shown in FIGS. 3 and 7, the mounting portion 44 extends downward from the cylindrical portion 34 and has a pair of fastening portions 46, 46 projecting to both the left and right sides at the lower end portion. The fastening portion 46 has a bolt hole 48 penetrating vertically. In this embodiment, the tubular portion 34 and the mounting portion 44 are integrally formed.

The cylindrical mount body 12 is attached to the outer side bracket 14 by press-fitting the outer cylindrical member 18 of the cylindrical mount body 12 into the cylindrical portion 34 of the outer side bracket 14, thereby forming the engine mount 10. there is The axial length dimension of the outer tubular member 18 is substantially the same as the axial length dimension of the long portion 40 of the tubular portion 34, as shown in FIG. Therefore, the axial length dimension of the outer tubular member 18 is larger than the axial length dimension of the short portion 42 of the tubular portion 34, as shown in FIG.

When the cylindrical mount main body 12 is attached to the outer side bracket 14, the notch 38 is provided at a position away from the stopper rubbers 32, 32 in the circumferential direction, as shown in FIGS. In other words, the stopper rubbers 32, 32 are positioned with respect to the elongated portions 40, 40 of the outer side bracket 14 in the circumferential direction. When the tubular mount body 12 is attached to the outer side bracket 14 , the notch 38 is provided at a position including the fixing portion of the connecting portion 26 to the outer tubular member 18 in the circumferential direction.

As shown in FIG. 6, the outer tubular member 18 attached to the tubular portion 34 of the outer-side bracket 14 is press-fitted substantially entirely in the axial direction into the elongated portion 40 of the tubular portion 34 . As shown in FIG. 5, the outer tubular member 18 attached to the tubular portion 34 has its axial center portion press-fitted into the short portion 42 of the tubular portion 34 . Both end portions in the axial direction protrude axially outward from the cylindrical portion 34 at the portion where the notch portion 38 is formed in the circumferential direction. In other words, the outer tubular member 18 is partially exposed to the outer peripheral side of the tubular portion 34 in the circumferential direction through the plurality of cutouts 38 at both ends in the axial direction.

The press-fitting area of the outer tubular member 18 into the tubular portion 34 is ensured to be larger at the long portion 40 of the tubular portion 34 than at the short portion 42 of the tubular portion 34 . As a result, a sufficient press-fit fixing force between the outer tubular member 18 and the tubular portion 34 is ensured at the elongated portion 40 even if the tubular portion 34 is provided with the plurality of notches 38 .

In addition, since the notch portions 38 are provided at both ends of the cylindrical portion 34 in the axial direction at the same position in the circumferential direction of the cylindrical portion 34 , the outer cylindrical member 18 is press-fitted into the short portion 42 of the cylindrical portion 34 . The portion to be formed is the central portion in the axial direction. Therefore, the fixing force of the outer tubular member 18 press-fitted into the tubular portion 34 is exerted over the entire circumference in a well-balanced manner in the axial direction.

In the engine mount 10, the inner member 16 is attached to a power unit (not shown), the outer side bracket 14 is attached to the vehicle body 50 by bolts (not shown) inserted through the bolt holes 48, 48, and the outer cylindrical member 18 is attached to the outer side. It is attached to the vehicle body 50 via the bracket 14 (see FIG. 5). A power unit (not shown) is thereby attached to the vehicle body 50 via the engine mount 10 . The inner member 16 can be attached to a power unit (not shown) via an inner bracket (not shown).

Then, with respect to the input of normal vibration, the vibration damping effect based on the vibration damping action and the vibration insulating action due to the elastic deformation of the connecting portions 26, 26 of the main rubber elastic body 20 is exhibited.

The portions of the outer cylindrical member 18 where the connection portions 26, 26 of the main rubber elastic body 20 are provided are not expected to receive a large load input as much as the portion where the shaft-perpendicular stoppers 52, 52 described later are provided. Therefore, as shown in FIG. 3, a notch portion 38 is provided in the cylindrical portion 34 of the outer side bracket 14 at the portion where the connecting portions 26, 26 are provided in the circumferential direction. In this manner, the connecting portions 26, 26 can be provided without avoiding the cutout portion 38 in the circumferential direction, and are provided at positions in the circumferential direction different from the stopper rubbers 32, 32 constituting the axis-perpendicular stoppers 52, 52. The connecting parts 26, 26 can be arranged with a large degree of freedom.

Moreover, since the outer cylindrical member 18 has a substantially constant axial dimension over the entire circumference, the fixing area of the connecting portions 26, 26 on the inner peripheral surface of the outer cylindrical member 18 is notched in the cylindrical portion 34. Even if the portion 38 is formed, it is not affected. Therefore, even if the connecting portions 26, 26 are arranged in the portions where the short portions 42, 42 are positioned in the circumferential direction, the fixing strength of the connecting portions 26, 26 to the outer cylindrical member 18 can be sufficiently secured.

In addition, the axial effective free length of the connecting portions 26, 26 connecting the inner member 16 and the outer tubular member 18 is equal to or longer than the axial length of the short portions 42, 42 of the outer side bracket 14. there is Therefore, characteristics such as spring and damping performance of the main rubber elastic body 20 can be set with a large degree of freedom.

The short portions 42 , 42 of the outer side bracket 14 are attached to the central portion of the outer tubular member 18 in the axial direction, and the portion where the tubular portion 34 is provided with the notch 38 extends axially of the outer tubular member 18 . A central portion is reinforced by a cylindrical portion 34 . As a result, the load bearing capacity of the outer tubular member 18 is reduced to This is sufficiently ensured by the reinforcing action of the tubular portion 34 .

When a large load is applied in the vertical direction, the inner member 16 and the outer tubular member 18 are indirectly brought into contact with each other via the stopper rubbers 32 and 32 and the inner covering portion 22 , so that the inner member 16 and the outer tubular member 18 relative displacement amount in the vertical direction is limited. As a result, the amount of deformation of the connecting portions 26, 26 is limited, and damage due to excessive deformation of the connecting portions 26, 26 is avoided. As described above, in the tubular mount body 12, the axial stoppers 52, 52 for limiting the amount of relative displacement of the inner member 16 and the outer tubular member 18 in the direction perpendicular to the axis are configured including the stopper rubbers 32, 32. As shown in FIG. The shaft-perpendicular stoppers 52, 52 are provided at the portions where the stopper rubbers 32, 32 are formed.

A cutout portion 38 is provided in a portion away from the stopper rubbers 32, 32 in the circumferential direction, and the axial dimension of the cylindrical portion 34 is increased in the portion where the stopper rubbers 32, 32 are provided in the circumferential direction. As a result, even if the stopper load is partially input to the outer cylindrical member 18 in the circumferential direction at the portions where the stopper rubbers 32, 32 are formed, the outer cylindrical member 18 is longer than the cylindrical portion 34 at the input portion of the stopper load. It is effectively reinforced by the portion 40 . Therefore, the load-bearing performance of the outer tubular member 18 is effectively enhanced by the tubular portion 34 at the portion where the stopper load directly acts, and damage to the outer tubular member 18 due to the input of the stopper load is avoided. .

In this way, by providing the tubular portion 34 with the cutout portion 38 avoiding the portions constituting the axial stoppers 52, 52 formed by the stopper rubbers 32, 32, the weight of the outer side bracket 14 can be reduced, and the outer tubular member 18 can be can be effectively reinforced at the input portion of the stopper load.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific descriptions. For example, the specific shape of the notch 38, such as the length and depth in the circumferential direction, can be changed as appropriate.

The notch 38 does not necessarily have to be provided at both ends in the axial direction. When the notches 38 are provided at both ends in the axial direction, the notches 38 on both sides in the axial direction may be provided at different positions in the circumferential direction.

In the above-described embodiment, an example in which the notches 38 are provided at two locations on the cylindrical portion 34 in the circumferential direction is shown, but the notch portion 38 is provided at only one location on the cylindrical portion 34 in the circumferential direction. may be provided, or may be provided at three or more locations.

In the above-described embodiment, an example in which the axial stoppers 52 are provided at two positions in the circumferential direction was shown, but the axial stoppers 52 may be provided at only one position in the circumferential direction, or at three or more positions. may be provided in

The axis-perpendicular stopper 52 can also be configured by, for example, a stopper rubber projecting from the inner member 16 toward the outer cylindrical member 18 . The axial stopper 52 is not limited to the stopper rubber whose inside is also made of a rubber elastic body. can also be configured by a stopper member. Also, the stopper rubber (stopper member) may have a separate structure that is not fixed to either the inner member 16 or the outer tubular member 18 .

The connecting portions 26 , 26 of the main rubber elastic body 20 may be fixed to the outer cylindrical member 18 at the portions outside the notch 38 in the circumferential direction. Accordingly, the effect of reinforcing the outer tubular member 18 by the tubular portion 34 is exerted over a wide range in the axial direction, even against the load exerted on the outer tubular member 18 from the connecting portions 26 , 26 .

In the outer side bracket 14 of the above-described embodiment, the tubular portion 34 and the mounting portion 44 are integrally formed, and the tubular portion 34 is integrally connected to the mounting portion 44 at a part in the circumferential direction. In the outer side bracket 14, the tubular portion and the mounting portion may be separate bodies. Specifically, for example, the cylindrical portion and the mounting portion are formed as separate bodies by fixing the cylindrical portion to the mounting portion formed of a press fitting or the like by means of welding or the like. An outer-side bracket having a structure that

Although the outer tubular member 18 of the above-described embodiment has a constant axial dimension over the entire circumference, the axial dimension of the outer tubular member may vary in the circumferential direction. In this case, the axial dimension of the portion press-fitted into the short portion 42 may be larger or smaller than the axial dimension of the portion press-fitted into the long portion 40 .

The outer tubular member 18 can protrude axially outward beyond the elongated portion 40 of the tubular portion 34 of the outer side bracket 14 at portions where the axial stoppers 52, 52 (stopper rubbers 32, 32) are provided.

The outer tubular member 18 does not need to be entirely straight, and for example, a flange-like portion protruding to the outer periphery may be provided at the end in the axial direction. According to this, the strength of the outer cylindrical member 18 can be improved, and the pull-out resistance against the outer side bracket 14 can be improved. Thus, the outer cylindrical member 18 does not need to have substantially constant outer diameter and inner diameter over the entire length in the axial direction. Further, the thickness dimension of the outer tubular member 18 may vary in the circumferential direction.

In the above-described embodiment, both the inner member 16 and the outer tubular member 18 are fixed when the main rubber elastic body 20 is molded. It's okay to be there. In this case, the inner member 16 can be attached to the main rubber elastic body 20 without being fixed.

In the above-described embodiment, the outer side bracket 14 is a separate component from the vehicle body 50, but the outer side bracket may be configured by a part of the vehicle body, for example. Specifically, for example, an arm member having an arm eye having a cylindrical inner peripheral surface is provided on the vehicle body, and the arm member, which is a part of the vehicle body, may constitute the outer bracket. can.

As the cylindrical mount body, a fluid-filled cylindrical vibration isolator having a fluid chamber filled with an incompressible fluid can be used.

10 Engine mount (cylindrical anti-vibration device with bracket)
12 Cylindrical mount main body 14 Outer side bracket 16 Inner member 18 Outer cylindrical member 20 Main body rubber elastic body 22 Inner coating portion 24 Outer coating portion 26 Connecting portion 28 First hollow hole 30 Second hollow hole 32 Stopper rubber 34 Cylindrical Part 36 Fitting surface 38 Notch 40 Long part 42 Short part 44 Mounting part 46 Fastening part 48 Bolt hole 50 Vehicle body 52 Axial stopper

Claims (7)

a tubular mount main body in which the inner member and the outer tubular member are connected by a main rubber elastic body;
A tubular vibration isolator with a bracket, comprising: an outer side bracket having a tubular portion to which the outer tubular member is press-fitted and fixed, and an outer side bracket having a mounting portion projecting from the outer peripheral surface of the tubular portion,
The tubular mount main body is partially provided with an axis-perpendicular stopper for limiting the amount of relative displacement between the inner member and the outer tubular member in the circumferential direction,
The outer side bracket is provided with a pair of cutouts at axial ends of the tubular portion at portions away from the axial stoppers on both sides in the circumferential direction,
Both of the pair of notch portions are positioned circumferentially out of the mounting portion,
A tubular vibration damping device with a bracket, wherein the axial length of the tubular portion is shortened by the pair of cutouts, and the outer tubular member is exposed to the outer periphery through the cutouts . 2. A tubular vibration damping device with a bracket according to claim 1, wherein said cutout portions are formed at both ends in the axial direction of said tubular portion of said outer side bracket. 3. A tubular vibration isolator with a bracket according to claim 1, wherein the axial length of said outer tubular member is substantially constant over the entire circumference. The tubular vibration isolator with bracket according to any one of claims 1 to 3, wherein the tubular portion of the outer side bracket is thicker than the outer tubular member. The cutout portion is formed at a position including a fixed portion of the main rubber elastic body to the outer cylindrical member in the circumferential direction,
The effective free length in the axial direction of the main rubber elastic body that connects the inner member and the outer tubular member is equal to or greater than the axial length of the portion of the tubular portion of the outer side bracket where the notch is formed. The cylindrical vibration isolator with a bracket according to any one of claims 1 to 4. 2. Both ends of the notch in the circumferential direction are formed by smooth curved surfaces without corners, and are smoothly continuous with axial end surfaces of portions of the tubular portion outside the notch. 6. The tubular vibration isolator with bracket according to any one of 1 to 5. The main rubber elastic body is provided with a pair of connecting portions extending obliquely downward from the inner member toward the outer cylindrical member on both sides in the left-right direction, and
While the axial stopper limits the amount of relative displacement in the vertical direction between the inner member and the outer cylindrical member,
2. The outer side bracket is provided with the mounting portion in a portion in the circumferential direction, and the cutout portion is formed in both side portions in the left-right direction at positions displaced from the mounting portion in the circumferential direction. 7. The tubular vibration isolator with bracket according to any one of 1 to 6.

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