JP7329429B2 - 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 mounting a tubular mount body to a vehicle, an inner side bracket having a fixing portion that is press-fitted and fixed to an inner tubular member of the tubular mount body has been employed. For example, it is described in Japanese Patent Application Laid-Open No. 2015-064098 (Patent Document 1).

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

JP 2015-064098 A

However, as a result of examination by the present inventors, in a tubular vibration isolator with a bracket having a conventional structure in which the fixing portion of the inner side bracket is press-fitted into the inner tubular member halfway, as described in Patent Document 1, It was found that the functional mutual complementation of the inner tubular member and the fixed portion was not yet sufficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bracket-equipped cylindrical vibration isolator with a novel structure that can improve the functional mutual complementation of the inner cylindrical member and the fixing portion of the inner side bracket.

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 is a bracket including a tubular mount body in which an inner tubular member and an outer tubular member are elastically connected by a main rubber elastic body, and an inner side bracket having a fixing portion press-fitted into the inner tubular member. In the cylindrical vibration isolator, the cylindrical mount main body has an axially-direct stopper rubber that limits the amount of relative displacement between the inner cylindrical member and the outer cylindrical member in the axial direction intermediate the outer cylindrical member. and a position of the press-fit tip position of the fixed portion of the inner side bracket into the inner tubular member is set in the middle of the inner tubular member in the axial direction, and , reaches a region where the axially-direct stopper rubber is provided, and is positioned between an end edge of the axially-directed stopper rubber on the press-fitting distal end side and an edge on the press-fitting base end side, and A covering rubber is provided on the inner peripheral surface, and the fixing portion is directly press-fitted and fixed to the inner cylindrical member so as to compress the covering rubber in a radial direction, and the inner cylindrical member The fixing portion of the inner bracket press-fitted into the inner bracket is formed with a lightening recess, and the lightening recess extends in the axial intermediate portion of the fixing portion in the circumferential direction.

According to the tubular vibration-damping device with bracket constructed according to this mode, the press-fit tip position of the fixed portion of the inner side bracket is appropriately set midway in the axial direction of the inner tubular member. The weight of the inner side bracket can also be reduced by shortening the fixing portion while ensuring the press-fit fixing force to the cylindrical member. In addition, by setting the tip position of the press-fitting portion of the fixing portion to the inner cylindrical member so that the fixing portion of the inner side bracket reaches the region where the axial stopper is provided, in the region where the stopper load of the axial stopper acts. , the inner cylindrical member is reinforced by the fixed portion, and the load bearing performance is improved. In this way, the fixed portion is press-fitted into the inner cylindrical member up to the region where the axial stopper is provided, so that the intended function of securing the press-fit fixing force and load-bearing performance (deformation rigidity) can be achieved. This is effectively achieved by improving the functional mutual complementation of the cylindrical member and the fixing portion. Therefore, even if the fixed portion of the inner side bracket is press-fitted only halfway into the inner tubular member, it is possible to sufficiently satisfy the intended functions, and the fixed portion can be shortened to reduce the weight of the inner side bracket. It is possible to achieve the required performance while improving the
Further, according to the tubular vibration isolator with bracket constructed according to this aspect, the length of the fixing portion in the press-fitting direction is such that the tip position of the fixing portion press-fitted into the inner tubular member reaches the area where the axial stopper is provided. It is possible to further reduce the weight of the inner side bracket including the fixing portion while ensuring the rigidity.

According to a second aspect, in the tubular vibration-damping device with bracket according to the first aspect, the press-fit tip position of the inner side bracket is located in the middle of the outer tubular member in the axial direction. .

According to the tubular vibration-damping device with bracket constructed according to this mode, the inner tubular member can be reinforced by the inner side bracket in the region where the stopper load of the axial stopper acts, and the length of the fixing portion can be increased. By sufficiently shortening the length, the weight reduction of the inner side bracket can be realized more effectively.

ADVANTAGE OF THE INVENTION According to this invention, in a tubular vibration isolator with a bracket, it is possible to improve functional mutual complementation between the inner tubular member and the fixing portion of the inner side bracket.

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 an inner side bracket 14 and an outer side bracket 16 are attached to a cylindrical mount body 12 . Further, the tubular mount main body 12 has a structure in which the inner tubular member 18 and the outer tubular member 20 are connected by the main rubber elastic body 22 . 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 tubular member 18 is a hard member made of metal or synthetic resin and has a substantially cylindrical shape. The inner cylindrical member 18 has a substantially constant length dimension in the axial direction over the entire circumference. The inner tubular member 18 has a substantially constant thickness dimension over the entire circumference. The inner tubular member 18 may vary in thickness dimension and axial length dimension in the circumferential direction. The specific shape of the inner tubular member 18 is not limited to a cylindrical shape, and may be, for example, a tubular shape other than a cylinder such as a polygonal tubular shape.

The outer tubular member 20 is a hard member made of metal or synthetic resin. The outer tubular member 20 has a substantially cylindrical shape with a larger diameter than the inner tubular member 18, and has a substantially constant thickness dimension and a substantially constant axial dimension over the entire circumference. The outer tubular member 20 may vary in thickness dimension and axial length dimension in the circumferential direction. In the present embodiment, the inner tubular member 18 and the outer tubular member 20 have substantially the same axial dimension. , the length dimension in the axial direction may be different from each other.

As shown in FIG. 7, the inner tubular member 18 is inserted into the outer tubular member 20, and the main rubber elastic body 22 is provided between the inner tubular member 18 and the outer tubular member 20 in the radial direction. The main rubber elastic body 22 includes an inner covering portion 24 fixed to the surface of the inner tubular member 18, an outer covering portion 26 fixed to the inner peripheral surface of the outer tubular member 20, and the inner covering portion 24 and the outer covering portion. A pair of connecting portions 28, 28 for connecting 26 to each other are provided. In this embodiment, the inner covering portion 24 is provided so as to cover all of the inner peripheral surface, the outer peripheral surface, and the axial end surface of the inner cylindrical member 18 .

The connecting portions 28, 28 are provided on both sides in the left-right direction with respect to the inner cylindrical member 18 (the inner covering portion 24). The connecting portions 28 , 28 straddle between the inner covering portion 24 and the outer covering portion 26 and extend substantially in the radial direction. The connecting portions 28 , 28 have elastic central axes extending in the length direction (substantially radial direction) that gradually incline downward from the inner covering portion 24 toward the outer covering portion 26 . The connecting portions 28 , 28 are integrally formed with the inner covering portion 24 and the outer covering portion 26 .

A first hollow hole 30 is formed in the upper side of the connecting portions 28 and 28 so as to penetrate therethrough in the axial direction. A second hollow hole 32 is formed through the connecting portions 28, 28 in the axial direction.

A pair of stopper rubbers 34 , 34 are provided on the outer covering portion 26 of the main rubber elastic body 22 . The stopper rubber 34 is partially provided in the circumferential direction and has a projection shape projecting from the outer covering portion 26 toward the inner covering portion 24 . The stopper rubber 34 is narrowed in the circumferential direction and narrowed in the axial direction toward the projecting tip side, and has a tapered shape. A protruding tip surface of the stopper rubber 34 is formed as a substantially flat surface extending substantially perpendicularly to the vertical direction.

The stopper rubber 34 is partially provided in the axial direction midway of the outer covering portion 26 that covers the inner peripheral surface of the outer cylindrical member 20, and in the present embodiment, is provided in the axial center of the outer covering portion 26. are distributed. The stopper rubbers 34, 34 are arranged to face each other with the inner covering portion 24 (the inner cylindrical member 18) interposed therebetween in the vertical direction. The stopper rubbers 34, 34 are provided at positions separated from the inner covering portion 24 by a predetermined distance in the vertical direction.

The upper stopper rubber 34 protrudes into the first hollow hole 30 and the lower stopper rubber 34 protrudes into the second hollow hole 32 . A stopper clearance (gap) between the upper stopper rubber 34 and the inner covering portion 24 (inner cylindrical member 18) is provided by the first hollow hole 30. As shown in FIG. A stopper clearance between the lower stopper rubber 34 and the inner covering portion 24 is provided by the second hollow hole 32 .

An inner side bracket 14 and an outer side bracket 16 are attached to the cylindrical mount body 12 having such a structure.

The inner side bracket 14 is a highly rigid member made of metal, synthetic resin, or the like. The inner side bracket 14 is, for example, a molded product formed by metal casting, die casting, or the like. The inner side bracket 14 includes a fixing portion 36 and an inner mounting portion 38, as shown in FIG.

The fixed portion 36 has a shaft shape (columnar shape) that is press-fitted into the inner circumference of the inner cylindrical member 18 . The fixed portion 36 has an outer diameter dimension smaller than an inner diameter dimension of the inner cylindrical member 18 . In addition, the outer diameter dimension of the fixing portion 36 is made larger than the inner dimension of the inner covering portion 24 that covers the inner peripheral surface of the inner cylindrical member 18 . The outer diameter dimension of the fixing portion 36 referred to here is the outer diameter dimension of the portion outside the recessed portion 40 which will be described later.

The axial length dimension a of the fixed portion 36 is shorter than the axial length dimension b of the inner cylindrical member 18 . The axial length dimension a of the fixing portion 36 is set according to the required fixing strength between the inner cylindrical member 18 and the fixing portion 36 . The length dimension a in the axial direction of the fixed portion 36 is preferably 1/2 or more and 4/5 or less times the length dimension b in the axial direction of the inner cylindrical member 18 . As a result, both the fixing force of the inner tubular member 18 and the fixing portion 36 by press-fitting and the weight reduction of the inner side bracket 14 including the fixing portion 36 are effectively realized.

A lightening concave portion 40 is formed in the fixed portion 36 . The lightening recess 40 of the present embodiment is formed on the outer peripheral surface of the fixing portion 36 and has a concave groove shape extending in the circumferential direction of the fixing portion 36 . The lightening recess 40 may be provided so as to extend continuously over the entire circumference of the fixed portion 36, or have a length that is less than one circumference in the circumferential direction (for example, approximately half the circumference, approximately 1/4 the circumference, etc.). It may extend continuously over the A plurality of lightening recesses 40 are formed in parallel at predetermined distances from each other in the axial direction of the fixing portion 36 . In this embodiment, three lightening recesses 40 , 40 , 40 continuous over the entire circumference are provided in parallel at approximately equal intervals in the axial direction of the fixed portion 36 .

The specific shape and formation position of the lightening recess 40 may be changed as appropriate. Further, the lightening recess 40 of the present embodiment that opens to the outer peripheral surface of the fixing portion 36 and the recessed lightening recess that opens to the axial end surface of the fixing portion 36 can be used in combination.

An inner mounting portion 38 is integrally formed on one outer side of the fixed portion 36 in the axial direction. The inner attachment portion 38 extends axially outward with substantially the same circular cross-section as the fixed portion 36, and has a solid block-shaped axially outer portion, which is wider in the left-right direction than the length in the axial direction. The width dimension is increased. As shown in FIGS. 3 and 7, the lateral dimension of the inner mounting portion 38 is larger than the outer diameter of the outer tubular member 20, and the outer diameter of the tubular portion 44 of the outer side bracket 16, which will be described later. It is made even larger than the dimensions. As shown in FIGS. 2 and 4 , bolt holes 42 are formed through the inner mounting portion 38 in the left-right direction, respectively.

The outer side bracket 16 is a highly rigid member made of metal, synthetic resin, or the like. The outer side bracket 16 has a tubular portion 44 . The tubular portion 44 has a substantially cylindrical shape as a whole, and the inner peripheral surface thereof has a substantially circular cross section. The tubular portion 44 is thicker than the outer tubular member 20 and has a large deformation rigidity. The cylindrical portion 44 has a substantially constant length dimension in the axial direction over the entire circumference.

The outer side bracket 16 has an outer mounting portion 46 . As shown in FIGS. 1 and 7, the outer mounting portion 46 has a groove shape that opens upward as a whole and extends linearly in the left-right direction. The outer attachment portion 46 is formed, for example, by forming a metal base plate into a predetermined shape by pressing. The bottom wall portion 48 of the groove-shaped outer mounting portion 46 is formed with bolt holes 50 penetrating in the vertical direction at both end portions in the left-right direction. Further, an arcuate concave surface 54 corresponding to the outer peripheral surface of the outer cylindrical member 20 is formed at the central portion in the left-right direction of the side wall portions 52 , 52 of the outer mounting portion 46 . The outer mounting portion 46 is formed as a separate member from the cylindrical portion 44, and the outer peripheral surface of the cylindrical portion 44 overlaps the concave surface 54 of the outer mounting portion 46, so that the cylindrical portion 44 is welded or otherwise welded. It is fixed to the outer mounting portion 46 by means. The tubular portion 44 is provided across both side wall portions 52, 52 of the outer mounting portion 46, and the concave surfaces 54, 54 of the both side wall portions 52, 52 are both superimposed on the outer peripheral surface of the tubular portion 44. It is fixed by means such as welding.

The fixing portion 36 of the inner side bracket 14 is press-fitted and fixed to the inner tubular member 18 covered with the inner covering portion 24, and the outer tubular member 20 of the tubular mount body 12 is press-fitted into the tubular portion 44 of the outer side bracket 16. Fixed. As a result, the inner side bracket 14 and the outer side bracket 16 are attached to the tubular mount body 12 to form the engine mount 10 .

The fixing portion 36 of the inner side bracket 14 has a tapered surface in which the outer peripheral surface of the end on the press-fit tip side becomes smaller in diameter toward the press-fit tip side. The guiding action exerted by the abutment of the inner tubular member 18 against the tapered surface facilitates the positioning of the fixed portion 36 with respect to the inner tubular member 18 in the direction perpendicular to the axis. Press-fitting to 18 is supposed to be easy.

A press-fit position regulating portion that defines the axial press-fit position of the inner side bracket 14 into the inner tubular member 18 and a positioning portion that positions the inner side bracket 14 and the inner tubular member 18 in the circumferential direction may be provided. For example, the press-fitting position regulating portion may be configured by providing a projection at the end of the outer peripheral surface of the inner mounting portion 38 on the press-fitting tip side, and bringing the projection into contact with the axial end surface of the inner cylindrical member 18 . can. As the positioning portion, for example, the inner peripheral surface of the inner tubular member 18 and the outer peripheral surface of the fixed portion 36 may have mutually corresponding cross-sectional shapes other than a circular shape. It is also possible to provide a recess into which the protrusions forming the defining portion are fitted, and to engage the protrusions with the inner surface of the recess in the circumferential direction.

The axial length dimension a of the fixing portion 36 of the inner side bracket 14 is shorter than the axial length dimension b of the inner tubular member 18, and the tip position (Fig. 6) is located in the middle of the inner tubular member 18 in the axial direction. Since the fixed portion 36 has a length such that it is press-fitted into the inner tubular member 18 only halfway in the axial direction, the fixed portion 36 is press-fitted over the entire axial length of the inner tubular member 18 . The weight of the inner side bracket 14 can be reduced as compared with the structure.

The press-fit tip position P of the fixing portion 36 of the inner bracket 14 is desirably set in the middle of the outer tubular member 20 in the axial direction. According to this, for example, when the axial length dimension of the inner tubular member 18 is larger than the axial length dimension of the outer tubular member 20, the stopper rubbers 34, 34 move the press-fit tip position P of the fixing portion 36. The fixed portion 36 can be made sufficiently short to reduce the weight while reaching the provided area.

A lightening recess 40 is formed in the fixing portion 36 of the inner side bracket 14 to further reduce the weight of the inner side bracket 14 . Since the lightening recess 40 is formed so as to open to the outer peripheral surface in the axially intermediate portion of the fixing portion 36, the press-fit tip position P of the fixing portion 36 is shifted in the axial direction by the formation of the lightening recess 40. It will never change.

The inner mounting portion 38 is exposed axially outward from the inner tubular member 18 in a state in which the fixing portion 36 is press-fitted and fixed to the inner tubular member 18 . The inner mounting portion 38 has a solid block-shaped outer portion in which a bolt hole 42 is formed, which is located axially outwardly away from the cylindrical portion 44 of the outer side bracket 16 . Since the lateral dimension of the outer portion of the inner mounting portion 38 is set to be larger than the outer diameter of the cylindrical portion 44 , at least a portion of the inner mounting portion 38 extends from the axial end surface of the cylindrical portion 44 . are arranged facing each other. For example, by disposing a cushioning rubber between the facing surfaces of the inner mounting portion 38 and the cylindrical portion 44, the amount of relative displacement in the axial direction between the inner cylindrical member 18 and the outer cylindrical member 20 is controlled by the inner mounting portion 38 and the cylindrical portion. It is also possible to construct an axial stop that is limited by abutment via the cushioning rubber of 44 .

The axial length dimension of the outer tubular member 20 is substantially the same as the axial length dimension of the tubular portion 44, as shown in FIG. Therefore, substantially the entire outer cylindrical member 20 is press-fitted and fixed to the cylindrical portion 44 .

In the engine mount 10, the inner side bracket 14 is attached to the power unit 56 as shown in FIG. 6 by bolts (not shown) inserted through the bolt holes 42,42. In the engine mount 10, the outer side bracket 16 is attached to the vehicle body 58 by bolts (not shown) inserted through the bolt holes 50,50. The inner tubular member 18 is attached to the power unit 56 via the inner bracket 14 , and the outer tubular member 20 is attached to the vehicle body 58 via the outer bracket 16 . The power unit 56 is thereby attached to the vehicle body 58 via the engine mount 10 .

When the engine mount 10 is attached to the vehicle, the vibration damping effect and the vibration insulating effect due to the elastic deformation of the connecting portions 28, 28 of the main rubber elastic body 22 are exhibited. be.

The portions of the main rubber elastic body 22 where the connecting portions 28, 28 are provided are not expected to receive a large load input as much as the portions where the axis-perpendicular stoppers 60, 60, which will be described later, are provided. Therefore, even if the connecting portions 28 , 28 are fixed to the inner tubular member 18 from the press-fit tip position P of the fixing portion 36 to the press-fit tip side, the inner tubular member 18 is prevented from being deformed or the like. Therefore, it is possible to secure a large free length in the axial direction of the connecting portions 28, 28, and it is possible to set the characteristics such as spring and damping of the connecting portions 28, 28, durability, etc. with a large degree of freedom. .

When a large load is applied in the vertical direction, the inner tubular member 18 and the outer tubular member 20 are indirectly brought into contact via the stopper rubbers 34, 34 and the inner covering portion 24. The amount of relative displacement of the member 20 in the vertical direction is limited. As a result, the amount of deformation of the connecting portions 28, 28 is limited, and damage due to excessive deformation of the connecting portions 28, 28 is avoided. As described above, in the tubular mount body 12, the axial stoppers 60, 60 for limiting the amount of relative displacement of the inner tubular member 18 and the outer tubular member 20 in the direction perpendicular to the axis are configured including the stopper rubbers 34, 34. . The shaft-perpendicular stoppers 60, 60 are provided at the portions where the stopper rubbers 34, 34 are formed. Therefore, the area between both side surfaces of the stopper rubbers 34, 34 in the axial direction is a region in which the axial stoppers 60, 60 are provided in the axial direction.

The press-fit tip position P of the fixing portion 36 reaches the area where the stopper rubbers 34, 34 are arranged, that is, the area where the axis-perpendicular stoppers 60, 60 are provided. The press-fit tip position P is located on the press-fit tip side (left side in FIG. 6) from the edge p1 on the press-fit base end side (right side in FIG. 6) of the projecting tips of the stopper rubbers 34, 34. FIG. The press-fit tip position P may be located on the press-fit tip side from the viewpoint of weight reduction with respect to the press-fit tip end edge p2 at the protruding tip of the stopper rubbers 34, 34, or may be positioned on the press-fit tip side from the viewpoint of load resistance performance. It may be located on the proximal side.

In this manner, the fixed portion 36 of the inner side bracket 14 is press-fitted into the portion of the inner cylindrical member 18 on which the stopper load of the axial stoppers 60 , 60 acts. Therefore, the inner cylindrical member 18 is reinforced by the fixed portion 36 at the portion where the stopper load acts, thereby improving the load bearing performance. By press-fitting the fixed portion 36, which has a solid columnar shape and greater deformation rigidity than the inner tubular member 18, into the inner tubular member 18, the inner tubular member 18 is sufficiently reinforced by the fixed portion 36, and the stopper load is reduced. This prevents damage to the inner cylinder member 18 due to the input of .

By providing a plurality of lightening recesses 40, the opening area of each lightening recess 40 on the outer peripheral surface of the fixing portion 36 can be reduced. Therefore, the weight reduction of the inner side bracket 14 can be realized by providing the fixing portion 36 with the recessed portion 40, and the effect of reinforcing the inner cylindrical member 18 by the fixing portion 36 can be effectively obtained.

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 fixing portion 36 of the inner side bracket 14 is not limited to a substantially cylindrical shape, and may have a prismatic shape, a columnar shape with an irregular cross section, or the like. The shape of the inner peripheral surface of the inner tubular member 18 is set according to the shape of the outer peripheral surface of the fixing portion 36 . The specific shape of the inner mounting portion 38 of the inner side bracket 14, the number and arrangement of the bolt holes 42, and the like are appropriately changed according to, for example, the structure of the power unit 56 side.

In the fixing portion 36 of the inner side bracket 14, the lightening recess 40 may not be provided. The shape, number, size, arrangement, etc. of the lightening recesses 40 can be changed as appropriate.

In the above-described embodiment, the end surface of the inner side bracket 14 on the press-fit tip side is located halfway in the axial direction of the inner tubular member 18, but for example, the end surface of the inner side bracket 14 on the press-fit tip side It may protrude from 18 toward the press-fit tip side in the axial direction. In this case as well, the press-fit tip position P of the inner bracket 14 into the inner tubular member 18 is set in the middle of the inner tubular member 18 in the axial direction. For example, the tip side has a smaller diameter than that of the press-fit portion, so that the weight can be reduced.

The inner cylindrical member 18 does not need to have substantially constant inner diameter and outer diameter over the entire length in the axial direction. can. Similarly, the inner diameter and outer diameter of the outer tubular member 20 may change partially or entirely in the axial direction.

The outer tubular member 20 does not necessarily have to be press-fitted substantially entirely into the tubular portion 44 of the outer side bracket 16 . Specifically, for example, a notch is partially provided in the axial end portion of the tubular portion 44 in the circumferential direction, and the axial length of the tubular portion 44 extends to the outer tubular member 20 at the portion where the notch is formed. The outer cylindrical member 20 may be exposed to the outer periphery through the notch portion by making the outer cylindrical member 20 shorter than the length in the axial direction. According to this, the weight of the outer side bracket 16 can be reduced by forming the notch, and the press-fit fixing force between the outer tubular member 20 and the tubular portion 44 can be ensured in the portion outside the notch in the circumferential direction. It is desirable that the notch be formed at a position away from the portion where the axial stoppers 60, 60 are provided in at least one of the circumferential direction and the axial direction. As a result, the outer tubular member 20 is reinforced by the tubular portion 44 in the portions where the stopper load of the axially-direct stoppers 60, 60 is applied, thereby avoiding damage to the outer tubular member 20 due to the input of the stopper load.

For the outer side bracket 16, for example, the cylindrical portion 44 and the outer mounting portion 46 may be integrally formed. Alternatively, the outer side bracket 16 may be configured by an arm member having an arm eye provided on the vehicle body 58 or the like.

In the above-described embodiment, an example in which the axial stoppers 60 are provided at two locations in the circumferential direction was shown, but the axial stoppers 60 may be provided at only one location in the circumferential direction, or may be provided at three locations or more. may be provided in The stopper rubber 34 that constitutes the axial stopper 60 may be provided over substantially the entire length of the outer cylindrical member 20 in the axial direction.

The axis-perpendicular stopper 60 can also be configured by, for example, a stopper rubber projecting from the inner tubular member 18 toward the outer tubular member 20 . The axially-direct stopper 60 is not limited to a stopper rubber whose interior is also made of a rubber elastic body. can also be configured by a stopper member. For example, it is possible to provide the stopper member integrally with the inner tubular member 18 by partially expanding the diameter of the inner tubular member 18 in the middle in the axial direction. Also, the stopper rubber (stopper member) may have a separate structure that is not fixed to either the inner tubular member 18 or the outer tubular member 20 .

In the above-described embodiment, both the inner tubular member 18 and the outer tubular member 20 are fixed when the main rubber elastic body 22 is molded. It may be said that In this case, the inner cylindrical member 18 can be attached to the main rubber elastic body 22 without being fixed.

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 Inner side bracket 16 Outer side bracket 18 Inner cylindrical member 20 Outer cylindrical member 22 Main rubber elastic body 24 Inner coating portion 26 Outer coating portion 28 Connecting portion 30 First hollow hole 32 Second hollow hole 34 Stopper rubber 36 Fixing portion 38 Inner mounting portion 40 Lightening recess 42 Bolt hole 44 Cylindrical portion 46 Outer mounting portion 48 Bottom wall portion 50 Bolt hole 52 Side wall portion 54 Concave surface 56 Power unit 58 Vehicle body 60 Axial stopper

Claims (2)

a tubular mount main body in which an inner tubular member and an outer tubular member are connected by a main rubber elastic body;
A tubular vibration isolator with a bracket including an inner side bracket having a fixing portion press-fitted into the inner tubular member,
In the tubular mount body, an axial stopper rubber for limiting the amount of relative displacement in the axial direction between the inner tubular member and the outer tubular member is partially axially located in the axially intermediate portion of the outer tubular member. While provided
The end position of the fixing portion of the inner side bracket that is press-fitted into the inner tubular member is set in the middle of the inner tubular member in the axial direction, and reaches the region where the axial stopper rubber is provided. is located between the press-fit tip end edge and the press-fit base end edge of the axial stopper rubber, and
A covering rubber is provided on an inner peripheral surface of the inner cylindrical member, and the fixing portion is directly press-fitted and fixed to the inner cylindrical member so as to compress the covering rubber in a radial direction, and ,
A cylindrical shape with a bracket, wherein the fixing portion of the inner side bracket press-fitted into the inner tubular member is formed with a lightening recess, and the lightening recess extends in the circumferential direction at an axially intermediate portion of the fixing portion. Anti-vibration device. 2. The bracket-equipped tubular vibration isolator according to claim 1, wherein the press-fit tip position of the inner side bracket is located in the middle of the outer tubular member in the axial direction.

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