JP6489833B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator used for, for example, an automobile.

  As a conventional vibration isolator, a cylindrical outer mounting member (for example, a bracket) that is attached to one of a vibration generating unit and a vibration receiving unit (for example, an engine), and among a vibration generating unit and a vibration receiving unit An inner mounting member attached to the other (for example, the vehicle body), and a main body member having an elastic member fixed around the inner mounting member and inserted on the inner peripheral side of the outer mounting member. Is known (for example, Patent Document 1).

JP 2011-89630

  In the vibration isolator as described above, when a load in the axial direction is input, a metal mounting member (hereinafter referred to as “partner”) of the vibration generating unit and the vibration receiving unit to which the inner mounting member is mounted is attached. Member ") may interfere with the end face in the axial direction of the metal outer mounting member, and the metal interference sound at the time of interference becomes noise, so it is desirable to be suppressed. As a method for reducing such interference noise, for example, it is conceivable to cover, in advance, a portion of the end face in the axial direction of the outer mounting member that is expected to contact the mating member with an elastic part. . However, in that case, there has been a problem that with the addition of the elastic body parts, the number of parts is increased, leading to an increase in cost.

  The present invention is for solving the above-described problems, and provides a vibration isolator capable of reducing interference noise between an end surface in the axial direction of an outer mounting member and a counterpart member while suppressing an increase in cost. It is for the purpose.

The vibration isolator of the present invention includes a cylindrical outer mounting member attached to one of the vibration generating portion and the vibration receiving portion, and an inner mounting attached to the other of the vibration generating portion and the vibration receiving portion. A member, and a main body elastic member fixed to the outer peripheral surface of the inner mounting member, and is inserted into the inner peripheral side of the outer mounting member, and is formed integrally with the main body elastic member, A cover elastic member that covers at least a part of the end surface in the axial direction of the outer mounting member, and the main body elastic member is fixed around the outer peripheral surface of the inner mounting member; and A leg portion extending from the outer periphery to the inner peripheral surface of the outer mounting member, and the covering elastic member is disposed so as not to overlap the leg portion in the axial projection plane. It is characterized by being.
According to the vibration isolator of the present invention, it is possible to reduce interference sound between the end surface in the axial direction of the outer mounting member and the counterpart member while suppressing an increase in cost.

  In the vibration isolator of the present invention, the main body elastic member has a plurality of the leg portions, and the covering elastic member has a plurality of the plurality of leg portions with respect to a predetermined virtual plane including a central axis of the inner mounting member. It is suitable if it is arranged on the side opposite to the leg. Thereby, the main body member can be easily inserted into the inner peripheral side of the outer mounting member when the vibration isolator is manufactured.

  In the vibration isolator of the present invention, the covering elastic member is provided on each side in the axial direction of the main body elastic member, and extends along a direction perpendicular to the axial direction. It is preferable that at least a part of each end face on both sides in the axial direction of the outer mounting member is covered with the covering elastic member. Thereby, the interference sound with an other party member can be reduced effectively in the end surface of the axial direction both sides of an outside attachment member.

  According to this invention, it is possible to provide a vibration isolator capable of reducing the interference noise between the end surface in the axial direction of the outer mounting member and the counterpart member while suppressing an increase in cost.

It is a perspective view which shows one Embodiment of the vibration isolator of this invention in the use condition. It is a perspective view which shows the main body member and cover elastic member of FIG. It is a figure for demonstrating an example of the process of inserting the main body member of FIG. 1 in the inner peripheral side of an outer side attachment member. FIG. 4A to FIG. 4C are enlarged perspective views of main parts for explaining different modified examples of the elastic covering member.

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

  1 to 3 show a vibration isolator 1 according to an embodiment of the present invention. As shown in FIG. 1, the vibration isolator 1 of this embodiment is inserted into a cylindrical outer mounting member 10 attached to a vibration generating unit (for example, an engine) and an inner peripheral side of the outer mounting member 10. The main body member 20 and two covering elastic members 30 made of rubber, for example, each covering at least a part (only a part in the example in the figure) of the end faces 10b on both sides in the axial direction of the outer mounting member 10 are provided. . The main body member 20 includes an inner attachment member 21 attached to a vibration receiving portion (for example, a vehicle body) and a main elastic member 22 made of rubber, for example, fixed to the outer peripheral surface of the inner attachment member 21. The cover elastic member 30 is formed integrally with the main body elastic member 22 by, for example, molding.

In the present specification, the “axial direction” refers to a direction along the central axis of the inner mounting member 21 (the chain line in FIGS. 1 and 2). In this specification, for convenience of explanation, the axial direction is the X-axis direction in the figure, and the first axis perpendicular direction and the second axis perpendicular direction that are orthogonal to each other in a plane perpendicular to the axis direction are respectively the Y-axis in the figure. Direction and the Z-axis direction (vertical direction in FIG. 1).
Further, in this specification, that the covering elastic member 30 “covers” at least a part of the end surface 10b in the axial direction of the outer mounting member 10 means that the covering elastic member 30 is outside the axial direction of the outer mounting member 10. That is, it is in contact with at least a part of the end face 10b in the axial direction of the outer mounting member 10 or in close proximity to the axial direction.

In this example, the outer mounting member 10 is configured as a metal bracket, and the end surface 10b in the axial direction is substantially parallel to a plane perpendicular to the axial direction (YZ plane).
The inner mounting member 21 is formed in a solid rod shape in this example, but may be formed in a cylindrical shape.
Note that the outer attachment member 10 may be attached to the vibration receiving portion, and the inner attachment member 21 may be attached to the vibration generating portion.

  In the example shown in FIG. 1, the end portions on both sides in the axial direction of the inner mounting member 21 protrude outward in the axial direction from the outer mounting member 10. And each protrusion part of the inner side attachment member 21 is respectively the one side of a 2nd axis | shaft direct direction with respect to the inner side attachment member 21 via the fastening member 40 extended in a 2nd axis | shaft direct direction (Z-axis direction), respectively. It is attached to a counterpart member 41 which is an attachment member on the vibration receiving portion side (lower side in FIG. 1).

Further, in the example of FIG. 1, each covering elastic member 30 is on one side in the second axial direction with respect to the inner mounting member 21 of the end surfaces 10 b on the corresponding side in the axial direction of the outer mounting member 10. It arrange | positions so that the part (lower side of FIG. 1) may be covered. Thereby, the covering elastic member 30 is interposed between the end surface 10b in the axial direction of the outer mounting member 10 and the counterpart member 41 in the axial direction.
By providing the covering elastic member 30, when the mating member 41 is relatively displaced toward the outer mounting member 10 in response to an input of an axial load, the mating member 41 is disposed only through the covering elastic member 30. It is possible to interfere with the end surface 10b in the axial direction of the ten. Thereby, it can be prevented that the mating member 41 directly interferes (contacts) with the end face 10b in the axial direction of the outer mounting member 10 to generate a metal interference sound, and the interference sound at the time of interference can be reduced.

The main body elastic member 22 is fixed around the outer peripheral surface of the inner mounting member 21 by, for example, vulcanization adhesion, and extends from the fixing portion 200 to the outer peripheral side to the inner peripheral surface of the outer mounting member 10. And two leg portions 201 extending up to.
In this example, the fixed portion 200 extends around the outer peripheral surface of the inner mounting member 21, that is, has an annular shape, and is spaced from the inner peripheral surface of the outer mounting member 10 to the inner peripheral side. .
Further, in this example, the leg portions 201 are press-fitted into the recess portions 10a formed on the inner peripheral surface of the outer mounting member 10 at the tip portions on the outer peripheral side, and are fitted into the recess portions 10a. It has a fitting part 201b, and a bridge part 201a that extends in a substantially radial direction between the fitting part 201b and the fixing part 200 and connects the fitting part 201b and the fixing part 200 to each other. . The fitting part 201b of the leg part 201 is press-fitted into the hollow part 10a of the outer mounting member 10 and is fitted to the hollow part 10a, whereby the fitting part 201b is firmly fixed in the hollow part 10a. Even when a load is input, the fitting part 201b is prevented from moving in either the axial direction or the axial direction with respect to the recessed part 10a.
Only one leg 201 may be provided, or three or more legs 201 may be provided.

  In this example, the cover elastic members 30 are each formed in a substantially plate shape, and are perpendicular to the axial direction from the corresponding ends of the fixing portion 200 of the main body elastic member 22 in the axial direction. It extends substantially parallel to the axial end surface 10b of the outer mounting member 10 along the axial direction (the YZ plane direction in the figure). More specifically, the cover elastic member 30 of the present example has a second axial direction (Z-axis direction) from both ends in the first axial direction (Y-axis direction) at the axial end of the fixed part 200. Two substantially columnar connecting portions 31 extending toward one side (the lower side in FIG. 1) and a width substantially the same as the outer diameter of the fixed portion 200, further from the two connecting portions 31 in the second axial direction And a flat plate portion 32 extending toward the one side. The fixing portion 200, the two connecting portions 31, and the flat plate portion 32 define the opening 30 a of the covering elastic member 30. Since the cover elastic member 30 has the opening 30a, the cover elastic member 30 can easily bend and deform from the YZ plane to the XY plane (that is, bend deformation toward the outside in the axial direction) with the position of the opening 30a as a base point. Has been.

  In the example shown in FIG. 1, in the axial projection plane (that is, in the projection plane onto the YZ plane), one end of the covering elastic member 30 in the direction perpendicular to the second axis (lower end in FIG. 1) is The outer mounting member 10 is located on one side (the lower side in FIG. 1) in the second axial direction from the end surface 10b in the axial direction.

An example of the step of inserting the main body member 20 into the inner peripheral side of the outer mounting member 10 during the manufacture of the vibration isolator 1 having the above-described configuration will be described with reference to FIG. FIG. 3 shows each component of the vibration isolator 1 when the main body member 20 is inserted into the outer mounting member 10 in a cross section in the XZ plane direction including the central axis of the inner mounting member 21. First, of the two covering elastic members 30 on both sides in the axial direction, the covering elastic member 30 facing the outer mounting member 10 side is bent approximately 90 degrees outward in the axial direction at the position of the opening 30a. And approximately parallel. The bending operation of the cover elastic member 30 may be performed manually or using a jig. The cover elastic member 30 may be bent toward the inner side in the axial direction.
Then, while maintaining the state in which the cover elastic member 30 is bent, the main body member 20 is inserted from one side in the axial direction (left side in FIG. 3) to the inner peripheral side of the outer mounting member 10, while the two leg portions 201 are moved. The respective fitting portions 201b are press-fitted into the recessed portions 10a (see FIG. 1) of the outer mounting member 10 while being compressed and deformed in the radial direction. The main body member 20 is inserted using, for example, a jig. Thereafter, when the covering elastic member 30 on the front side in the insertion direction (right side in FIG. 3) comes out on the other side (right side in FIG. 3) in the axial direction with respect to the outer mounting member 10, the axial direction of the main body member 20 with respect to the outer mounting member 10. And the bending action of the cover elastic member 30 on the front side in the insertion direction is eliminated, and the cover elastic member 30 is again extended along the axial direction (YZ plane direction). At this time, as shown in FIG. 1, the covering elastic members 30 on both sides in the axial direction respectively cover part of the end surfaces 10 b on the corresponding side in the axial direction of the outer mounting member 10.

  According to the present embodiment, the covering elastic member 30 configured to cover at least a part of the end surface 10b in the axial direction of the outer mounting member 10 is formed integrally with the main body elastic member 22. Compared with the case where an elastic body part for covering at least a part of the end surface 10b in the axial direction is provided as a separate member from the main body elastic member 22, the number of parts can be reduced, and the manufacturing cost can be reduced. Therefore, according to the present embodiment, it is possible to reduce the interference sound between the end surface 10b in the axial direction of the outer mounting member 10 and the counterpart member 41 while suppressing an increase in cost.

  In the present embodiment, the covering elastic members 30 are arranged so as not to overlap any of the leg portions 201 in the axial projection plane. Thereby, the covering elastic member 30 does not hinder the insertion work of the main body member 20 into the outer mounting member 10, and the insertion work can be easily performed.

Further, in this example, the covering elastic member 30 is in a predetermined virtual plane including the central axis of the inner mounting member 21 (in the example shown, a virtual plane in the XY plane direction including the central axis of the inner mounting member 21). The two legs 201 are disposed on the opposite side. More specifically, in the example of the figure, the covering elastic member 30 is disposed on one side in the Z-axis direction (the lower side in FIG. 1) with respect to the virtual plane in the XY plane direction including the central axis of the inner mounting member 21. The two leg portions 201 are arranged on the other side in the Z-axis direction (upper side in FIG. 1) with respect to the virtual plane. Thus, by disposing the covering elastic member 30 away from the two leg portions 201, the operation of inserting the main body member 20 into the outer mounting member 10 can be made easier.
Further, in this case, as in this example, a virtual plane including the central axis of the inner mounting member 21 and passing through the center position in the circumferential direction of the two leg portions 201 (in the example of the figure, the central axis of the inner mounting member 21 is It is more preferable that the two leg portions 201 and the cover elastic member 30 are arranged so that the virtual plane in the XZ plane direction in the drawing includes a central position in the circumferential direction of the cover elastic member 30. Thereby, the insertion operation | work in the outer side attachment member 10 of the main body member 20 can be made still easier.
From the same viewpoint, even when three or more leg portions 201 are provided, the covering elastic member 30 is opposite to all the leg portions 201 with respect to a predetermined virtual plane including the central axis of the inner mounting member 21. It is preferably arranged on the side. Furthermore, in this case, when the virtual plane including the central axis of the inner attachment member 21 and passing through the center position in the circumferential direction of all the leg portions 201 passes through the center position in the circumferential direction of the covering elastic member 30, More preferred.
Further, from the same viewpoint, when only one leg 201 is provided, a virtual plane including the central axis of the inner mounting member 21 and passing through the central position in the circumferential direction of the leg 201 is the circumference of the covering elastic member 30. It is more preferable to pass through a central position in the direction.

In this example, the cover elastic members 30 are provided on both sides of the main body elastic member 22 in the axial direction, respectively, and extend along the axial direction, whereby each of the end surfaces 10b on both sides in the axial direction of the outer mounting member 10 is provided. Since at least a part is covered with the covering elastic member 30, when the mating member 41 is disposed to face the end surfaces 10b on both sides in the axial direction of the outer mounting member 10, respectively, as in this example, This is particularly advantageous in that the interference sound with the mating member 41 can be reduced at each end face 10b.
However, the covering elastic member 30 may be provided only on one side in the axial direction of the main body elastic member 22.

  In this example, since the opening 30a is provided in the covering elastic member 30, the covering elastic member 30 can be easily bent and deformed toward the outside in the axial direction at the position of the opening 30a, so that the outer mounting member of the main body member 20 can be bent. 10 can be easily inserted. Further, even if the cover elastic member 30 is bent at the position of the opening 30a due to the presence of the opening 30a, the thickness of the cover elastic member 30 is not enlarged at the bent portion, so that when the main body member 20 is inserted into the outer mounting member 10 Further, the covering elastic member 30 is prevented from being rubbed and worn against the inner peripheral surface of the outer mounting member 10.

In addition, the vibration isolator of this invention is not restricted to what was mentioned above, Various modifications are possible.
For example, the covering elastic member 30 may not be provided with the opening 30a, but may be formed in a plate shape having a substantially uniform thickness throughout the whole.
Alternatively, as in the modification shown in FIG. 4A, the covering elastic member 30 has, in place of the opening 30a, a thin portion 30b having a thin plate thickness in a part thereof, thereby reducing the thickness of the thin portion 30b. The bending deformation toward the outside in the axial direction at the position may be facilitated.
4B, the covering elastic members 30 are arranged at substantially equal intervals in the first axis straight direction (Y-axis direction), and the fixing portions 200 of the main body elastic member 22 are arranged. May be composed of a plurality of divided pieces 30c extending along the second axis perpendicular direction (Z-axis direction).
Alternatively, as in the modification shown in FIG. 4C, the covering elastic member 30 has a narrow width extending from the fixing portion 200 of the main body elastic member 22 along the second axis perpendicular direction (Z-axis direction). It may be formed as a substantially pin-shaped member. 4B and 4C, the covering elastic member 30 can be easily bent toward the outside in the axial direction.

  In the vibration isolator 1 of the above-described example, the outer mounting member 10 is configured as a bracket, and the main body member 20 is directly press-fitted (inserted) into the bracket without passing through the outer cylinder. It is configured as. However, the vibration isolator 1 is not limited to this, and the vibration isolator 1 may be configured as a type of vibration isolator in which the main body member 20 is inserted into the outer cylinder, and then the main body member 20 and the outer cylinder are press-fitted into the bracket. In this case, the outer mounting member 10 is composed of an outer cylinder and a bracket.

  DESCRIPTION OF SYMBOLS 1: Anti-vibration apparatus, 10: Outer attachment member, 10a: Depression part, 10b: End surface of an axial direction, 20: Main body member, 21: Inner attachment member, 22: Main body elastic member, 30: Cover elastic member, 30a: Opening Part, 30b: thin part, 30c: divided piece, 31: connecting part, 32: flat plate part, 30a: opening, 40: fastening member, 41: mating member, 200: fixing part, 201: leg part, 201a: bridge part 201b: fitting portion

Claims (5)

A cylindrical outer mounting member attached to either one of the vibration generating portion and the vibration receiving portion;
An inner mounting member attached to the other of the vibration generating portion and the vibration receiving portion, and a main body elastic member fixed to the outer peripheral surface of the inner mounting member, and inserted into the inner peripheral side of the outer mounting member A body member,
A cover elastic member formed integrally with the main body elastic member and covering at least a part of the end surface in the axial direction of the outer mounting member;
With
The body elastic member is
A fixed portion fixed around the outer peripheral surface of the inner mounting member;
Legs extending from the fixed part to the outer peripheral side and reaching the inner peripheral surface of the outer mounting member;
Have
In the axial projection plane, the covering elastic member is disposed so as not to overlap the leg portion ,
The vibration-proof device, wherein the covering elastic member includes an easily deformable portion . A cylindrical outer mounting member attached to either one of the vibration generating portion and the vibration receiving portion;
An inner mounting member attached to the other of the vibration generating portion and the vibration receiving portion, and a main body elastic member fixed to the outer peripheral surface of the inner mounting member, and inserted into the inner peripheral side of the outer mounting member A body member,
A cover elastic member formed integrally with the main body elastic member and covering at least a part of the end surface in the axial direction of the outer mounting member;
With
The body elastic member is
A fixed portion fixed around the outer peripheral surface of the inner mounting member;
Legs extending from the fixed part to the outer peripheral side and reaching the inner peripheral surface of the outer mounting member;
Have
In the axial projection plane, the covering elastic member is disposed so as not to overlap the leg portion,
The anti-vibration device according to claim 1, wherein the covering elastic member includes one or a plurality of pin-like members extending from the fixed portion along a direction perpendicular to the axial direction. The vibration isolator according to claim 2, wherein the covering elastic member includes a plurality of the pin-shaped members. The main body elastic member has a plurality of the leg portions,
The said covering elastic member is arrange | positioned on the opposite side to these several leg parts with respect to the predetermined | prescribed virtual plane containing the center axis line of the said inner side attachment member. Anti-vibration device. The covering elastic members are respectively provided on both sides of the main body elastic member in the axial direction, and extend along directions perpendicular to the axial direction, respectively. The vibration isolator as described in any one of Claims 1-4 with which at least one part of each end surface is covered with the said covering elastic member.

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