JP2002235784A - Anti-vibration support device - Google Patents

Abstract

(57) [Problem] To provide an anti-vibration support device which can be set so as to suppress vibration in both the axial direction and the radial direction in a well-balanced manner and has excellent durability. An inner member (1) formed in a cylindrical shape, and an outer member (2) coaxially arranged outside the inner member (1) at a distance from the inner member (1).
And a first rubber elastic body 3 and a second rubber elastic body 4 interposed between the inner member 1 and the outer member 2.
The first rubber elastic body 3 is fixed to the main body 11 of the inner member 1 and the tubular portion 22 of the outer member 2 and is arranged so as to be sheared and supported in the axial direction by the inner member 1 and the tubular portion 22. I have. The second rubber elastic body 4 is a main body 1 of the inner member 1.
1 and the holding portion 26 of the outer member 2, and both ends thereof are arranged so as to be compressed and supported in the axial direction by the support portion 27 of the outer member 2 and the flange portion 12 of the inner member 1. Non-adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration support device used in a vehicle, for example, as a cab mount, a member mount, a body mount, or the like.

[0002]

2. Description of the Related Art Conventionally, for example, in a vehicle having a full frame structure, when a body (cabin) is mounted on a vehicle body frame, an anti-vibration support device such as a cab mount is provided to support the body in an anti-vibration manner. Has been adopted. As such a cab mount, a compression type using a compression deformation of a rubber elastic body and a shear type using a shear deformation of a rubber elastic body are known.

A compression type cab mount illustrated in FIG. 4 is formed in a cylindrical shape and has flange portions 112, 1 at both ends thereof.
12, an inner member 101 having an inner surface 12 and two flange portions 112 disposed coaxially at a distance outside the inner member 101.
Outer member 102 having a ring-shaped support portion 127 disposed between two flange portions 112 and 112 so as to face each other.
A cylindrical first rubber elastic body 103 fitted to the outside of the inner member 101 and fixed at both ends thereof to the one flange portion 112 and the support portion 127 so as to be compressed and supported in the axial direction; A cylindrical second rubber elastic member which is fitted to the outside of the inner member 101 and has one end fixed to the other flange portion 112 and the other end pressed against the support portion 127 so as to be axially compressed and supported. Body 104,
It is composed of

[0004] A shear-type cab mount illustrated in FIG. 5 is formed in a cylindrical shape and has a flange portion 21 at one end thereof.
2, an outer member 202 having a cylindrical portion 222 disposed coaxially at a distance outside the inner member 201, and an inner member 201 fixed to the inner member 201 and the cylindrical portion 222. And a cylindrical rubber elastic body 203 arranged so as to be sheared and supported in the axial direction by the cylindrical portion 222.

The above two types of cab mounts have inner members 101, 2 attached to either one of the body frame and the body.
By fixing the outer member 102, 202 to one of the other members while fixing the other member 01, the member is used in such a manner that the axial direction thereof is the up and down direction. By mounting a large number of cab mounts in this manner, the body is mounted on the vehicle body frame in a state where the body is supported by vibration isolation.

When vibration is generated on the vehicle body frame side due to operation of the engine or the like, the vibration is generated by the rubber elastic body 1.
The vibration transmitted from the vehicle body frame to the body is effectively reduced by being absorbed through the elastic deformations of the members 03, 104, and 203. That is, by appropriately setting the characteristics of the rubber elastic bodies 103, 104, and 203 in accordance with the frequency of the vibration for the purpose of reduction, the muffled sound that is uncomfortable for the occupant and the uncomfortable vibration that causes the body to tremble effectively are effective. To be reduced. It is effective to reduce the elasticity of the rubber elastic bodies 103, 104 and 203 for the muffled sound, and for the unpleasant vibration trembling with the rubber elastic body 1.
It is effective to increase the attenuation of 03, 104 and 203.

[0007] Further, it is generated when the vehicle is running.
Rolling (rolling) and pitching (forward-backward swing) of the body relative to the body frame are also performed by the rubber elastic body 103,
It is effectively suppressed by the elastic deformation of 104 and 203.

[0008]

By the way, the compression type cab mount is composed of first and second rubber elastic bodies 10.
Since the members 3 and 104 are configured to be compressed and supported in the axial direction (vertical direction), the rigidity in the axial direction mainly serving as the compression direction increases. Therefore, the first and second rubber elastic bodies 103 and 104 have a structure in which sufficient rigidity in the radial direction (left and right and front and rear directions of the vehicle) cannot be secured. Therefore, the first and the second rolling members are controlled so that the rolling and pitching that occur when the vehicle is running can be satisfactorily suppressed.
In addition, it is difficult to set the characteristics of the second rubber elastic bodies 103 and 104 in a well-balanced manner.

On the other hand, in the above-mentioned shear type cab mount, the rubber elastic body 203 is made of the inner member 201 and the cylindrical portion 222.
Are configured to be sheared and supported in the axial direction (vertical direction) by the inner member 201 and the cylindrical portion 222.
Are arranged so as to compress the rubber elastic body 203 in the radial direction (left and right and front and rear directions of the vehicle), so that the rigidity in the radial direction as the compression direction is increased. Therefore, in the case of the shear type cab mount, the rigidity of the rubber elastic body 203 in the radial direction can be made sufficiently higher than that of the compression type cab mount.

However, the cab mount of the shear type is
The flange portion 212 of the inner member 201 and the cylindrical portion 222 of the outer member 202 are arranged at a distance in the axial direction, and a part of the rubber elastic body 203 is also provided between the flange portion 212 and the intermediate portion.
And the cylindrical part 222 is interposed in a state of being fixed. Therefore, that portion of the rubber elastic body 203 (FIG. 5)
(Part indicated by arrow A in FIG. 3), when a vibration in the rebound direction (direction in which the inner member 201 and the outer member 202 move away from each other in the axial direction) is input, a pulling action is input, and the flange portion 212 and the cylindrical portion 22 are input. Large elongation occurs because they are fixed to the substrate. If such a pulling action is repeatedly input, a crack may be generated in the rubber elastic body 203 and durability may be insufficient.

The present invention has been devised in view of the above situation, and is provided with an anti-vibration support device which can be set to suppress both axial and radial vibrations in a well-balanced manner and has excellent durability. Is an issue to be solved.

[0012]

According to a first aspect of the present invention, there is provided an anti-vibration support device which is formed in a cylindrical shape and has a flange at one end thereof. A tubular portion disposed coaxially at a distance outside the inner member, a ring-shaped support portion provided at one end of the tubular portion and opposed to the flange portion, and an outer peripheral end of the support portion An outer member having a cylindrical holding portion extending from the inner member to the flange portion side, and being secured to the inner member and the cylindrical portion by shearing in the axial direction by the inner member and the cylindrical portion. Cylindrical first
A rubber elastic body is fitted between the inner member and the holding portion, and both ends thereof are arranged so as to be compressed and supported in the axial direction by the support portion and the flange portion, and at least one of the both ends is not bonded. And a cylindrical second rubber elastic body.

[0013] The anti-vibration support device of the present invention comprises a first rubber elastic body arranged to be sheared and supported by the cylindrical portions of the inner member and the outer member, and a flange portion of the inner member and a support portion of the outer member. Since it is configured to have the second rubber elastic body arranged to be supported by compression, the required rigidity in the radial direction is secured by the first rubber elastic body, and the required rigidity in the axial direction is obtained by the second rubber elastic body. 2 Secured by rubber elastic body. This makes it possible to set the vibration in both the axial direction and the radial direction in a well-balanced manner.

[0014] Further, since the second rubber elastic body disposed so as to be compressed and supported in the axial direction has at least one of both ends non-adhered, vibration in the rebound direction is applied to the second rubber elastic body. No pull action is input when input. Therefore, the risk of cracks or the like occurring in the second rubber elastic body is avoided, and the durability is improved.

Since the first rubber elastic body and the second rubber elastic body are separated and formed separately from each other, the vibration isolating support device of the present invention uses different rubber materials adapted to their arrangement structure. They can be used to form. This makes it possible to easily set the overall characteristics of the first rubber elastic body and the second rubber elastic body so as to be optimal,
This is advantageous for setting such that vibrations in both the axial direction and the radial direction are suppressed with good balance.

Therefore, the anti-vibration support device of the present invention can be easily set so as to suppress vibrations in both the axial direction and the radial direction with good balance, and is excellent in durability.

According to a second aspect of the present invention, in the vibration damping support device according to the first aspect, the second rubber elastic body is formed of rubber having a higher damping property than the first rubber elastic body. The means that have been adopted.

According to this means, the overall characteristics of the first rubber elastic body and the second rubber elastic body are improved by making only the second rubber elastic body have a high damping property. Without this, it is possible to enhance the attenuation. As a result, it is possible to realize both a low dynamic spring effective for unpleasant noise such as a muffled sound generated in the vehicle body and a high attenuation effective for uncomfortable vibration of the vehicle body.

As the rubber material forming the second rubber elastic body, for example, a diene rubber such as butadiene rubber (BR) or styrene-butadiene rubber (SBR), or butyl rubber can be suitably used. .

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the anti-vibration support device according to the present embodiment along the axial direction, and is a cross-sectional view taken along line II of FIG. 2, and FIG. 2 is a plan view of the anti-vibration support device. It is.

The anti-vibration support device of the present embodiment is used as a cab mount for supporting a cabin installed on a vehicle frame in an anti-vibration manner. As shown in FIGS. 1 and 2, the vibration isolating support device has a flange 12 at one end.
, An outer member 2 having a cylindrical portion 22 and a support portion 27 disposed coaxially outside the inner member 1, and being sheared and supported by the inner member 1 and the cylindrical portion 22. Rubber elastic body 3 arranged in such a manner that
7 and a second rubber elastic body 4 arranged to be compressed and supported by the flange portion 12.

The inner member 1 is formed in a cylindrical shape from an iron-based metal, and has a cylindrical main body 11 and a ring-shaped body coupled to one end of the main body 11 and protruding in a centrifugal direction from the outer peripheral surface of the main body 11. And the flange portion 12 of FIG. This inner member 1
Has an axial hole 13 through which a mounting bolt (not shown) or the like is inserted.

The outer member 2 is formed in a substantially cylindrical shape from an iron-based metal plate, and includes a first member 21 having a cylindrical portion 22;
The first member 21 includes a second member 25 having a holding portion 26, a support portion 27, and a mounting flange portion 28 coupled to one end of the first member 21. The first member 21 has a cylindrical portion 22 that is formed in a cylindrical shape larger than the main body portion 11 of the inner member 1 by a predetermined dimension and that is coaxially arranged outside the main body portion 11 at a distance. At one end of the cylindrical portion 22, a ring-shaped connecting portion 23 extending in the centripetal direction is provided. The cylindrical portion 22
A ring-shaped bent portion 2 extending in the centrifugal direction
4 are provided.

The second member 25 includes a cylindrical holding portion 26 having a diameter slightly larger than the cylindrical portion 22 and a short length.
Ring-shaped support portion 27 extending in the centripetal direction from one end of
And a mounting flange portion 28 extending in the centrifugal direction from the other end of the holding portion 26 and having an outer peripheral shape formed in a substantially rhombic shape. The support portion 27 is formed in a ring shape wider than the connection portion 23 of the first member 21, and is connected to an outer end surface of the connection portion 23 by welding. Mounting holes 28a, 28a for inserting mounting bolts (not shown) and the like are provided on both sides in the longitudinal direction of the mounting flange portion 28, and mounting flanges are provided around the mounting holes 28a, 28a. Reinforcing rings 29, 29 are fixed so that the portion 28 becomes thick. Further, the outer peripheral edge of the mounting flange portion 28 is bent to a side opposite to the first member 21.

The first rubber elastic body 3 is formed in a substantially cylindrical shape by vulcanizing and molding a rubber material mainly composed of natural rubber. The first rubber elastic body 3 has its inner peripheral surface vulcanized and bonded to the outer peripheral surface of the main body 11 of the inner member 1 and has its outer peripheral surface bonded to the inner peripheral surface of the cylindrical portion 27 of the outer member 2. Sulfur adhesive. Thereby, the first rubber elastic body 3 becomes
It is arranged so as to be sheared and supported in the axial direction by the inner member 1 and the cylindrical portion 27. The first rubber elastic body arranged as described above sufficiently secures the required rigidity in the radial direction.

Ring-shaped concave portions 31 and 32 are formed on both end surfaces of the first rubber elastic body 3 in order to adjust the spring constant in the axial direction. The bent portion 2 of the outer member 2 is provided at the end of the first rubber elastic body 3 on the concave portion 32 side.
The stopper portion 33 is formed so as to protrude on the outer end surface of the fourth member 4.

The second rubber elastic body 4 is formed in a substantially cylindrical shape by vulcanizing and molding a high damping rubber material mainly composed of styrene-butadiene rubber (SBR). The second rubber elastic body 4 is fitted between the main body 11 of the inner member 1 and the holding portion 26 of the outer member 2 such that the inner peripheral surface and the outer peripheral surface of the second rubber elastic body 4 are in contact therewith. The two end faces are assembled with the flange portion 12 of the inner member 1 and the support portion 27 of the outer member 2 in contact with each other. As a result, the rubber elastic body 4 holds the flange portion 12 in a state where the lateral displacement in the radial direction is regulated by the main body portion 11 and the holding portion 26.
The support member 27 of the outer member 2 is arranged so as to be compressed and supported in the axial direction. The second rubber elastic body 4 arranged in this way ensures the required rigidity of the first and second rubber elastic bodies 3 and 4 in the overall axial direction.

Note that both end surfaces of the second rubber elastic body 4 are in the rebound direction (the flange portion 12 and the support portion 2 in the axial direction).
7 so that the pulling action is not applied to the second rubber elastic body 4 when a vibration in the direction of moving away from the supporting member 7 is input.
7 and the flange portion 12 are not adhered.

The second rubber elastic body 4 and the first rubber elastic body 4
The rubber elastic body 3 is appropriately set with overall characteristics in the axial direction and the radial direction in accordance with the frequency of vibration for the purpose of reducing muffled noise and unpleasant vibration.

The anti-vibration support device of the present embodiment configured as described above has a mounting bolt (not shown) inserted into the shaft hole 13 of the inner member 1 in one of the vehicle body frame and the body. By fixing the inner member 1 by means of the above, the mounting flange portion 28 of the outer member 2 is fixed to one of the other members by a mounting bolt (not shown) or the like, so that the axial direction is the vertical direction. And can be mounted. By attaching a large number of anti-vibration devices in this manner, the body is installed on the vehicle body frame in a state where the vibration is supported.

When vibration is generated on the vehicle body frame side due to the operation of the engine or the like, the vibration is generated by the first and second vibrations.
By being absorbed through the elastic deformation of the rubber elastic bodies 3 and 4, the vibration transmitted from the vehicle body frame to the body is effectively reduced. That is, muffled sound and unpleasant vibration generated in the body are effectively reduced. In addition, the rolling and pitching of the body with respect to the body frame, which occur when the vehicle is running, and the like, also cause the first and second rubber elastic bodies 3 and 4
Is effectively suppressed by the elastic deformation of.

As described above, the anti-vibration support device of the present embodiment ensures the required rigidity in the radial direction by the first rubber elastic body 3 arranged so as to be sheared and supported in the axial direction. Since the required rigidity in the axial direction is ensured by the second rubber elastic body 4 arranged to be compressed and supported in the direction, vibrations in both the axial direction and the radial direction are suppressed in a well-balanced manner. It can be set as follows.

The second rubber elastic body 4 has both end faces non-adhered, so that even when vibration in the rebound direction is applied to the second rubber elastic body 4, the pulling action is not input. Therefore, generation of cracks in the second rubber elastic body 4 can be avoided, and the durability is excellent.

Further, the anti-vibration support device of this embodiment has the first rubber elastic body 3 and the second rubber elastic body since the first rubber elastic body 3 and the second rubber elastic body 4 are formed separately. 4 can be formed of different rubber materials so as to optimize the overall characteristics. Specifically, the first rubber elastic body 3 is formed of a rubber material mainly composed of natural rubber, and the second rubber elastic body 4 is formed of a high attenuation rubber material mainly composed of SBR. Therefore, it is possible to realize both a low dynamic spring effective for unpleasant noise such as a muffled sound generated in the vehicle body and a high attenuation effective for uncomfortable vibration of the vehicle body.

In this embodiment, both ends of the second rubber elastic body 4 are supported by the support portion 27 and the flange portion 12.
And non-adhesive, but only one of the end surfaces may be non-adhesive.

The outer member 2 of the above-described embodiment is formed by integrating the first member 21 and the second member 25 formed separately by welding, for example, one substantially cylindrical member. By pressing the metal material in the shape of a press, etc.
As shown in (1), it is also possible to form the outer member 2A in which the first member 21A and the second member 25A are integrated from the beginning. By doing so, the manufacturing of the outer member 2A can be simplified, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view along an axial direction of an anti-vibration support device according to an embodiment of the present invention, which is a cross-sectional view taken along line II of FIG.

FIG. 2 is a plan view of an anti-vibration support device according to the embodiment of the present invention.

FIG. 3 is a sectional view along an axial direction of an outer member according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view along the axial direction of a conventional anti-vibration support device.

FIG. 5 is a cross-sectional view along the axial direction of another conventional anti-vibration support device.

[Explanation of symbols]

1, 101, 201 ... inner member 2, 102, 20
2, outer member 3, 103, first rubber elastic body 4, 104, second rubber elastic body 203, rubber elastic body 11, body part 12, 112, 212, flange part 13, shaft hole 21, first member 22, 222 ... cylindrical part 23
... Connecting part 24 ... Bend part 25 ... Second member 26 ... Holding part 27,127 ... Support part 28 ... Mounting flange part
28a: mounting hole 29: reinforcing ring 31, 32: concave portion 33:
Stopper section

Claims (2)

[Claims] 1. An inner member formed in a cylindrical shape and having a flange portion at one end, a cylindrical portion arranged coaxially at a distance outside the inner member, and provided on one end side of the cylindrical portion. An outer member having a ring-shaped support portion disposed to face the flange portion and a cylindrical holding portion extending from the outer peripheral end of the support portion toward the flange portion side; the inner member and the tube A cylindrical first rubber elastic body fixed to the cylindrical portion and arranged to be sheared and supported in the axial direction by the inner member and the cylindrical portion; and fitted between the inner member and the holding portion. And a cylindrical second rubber elastic body whose both ends are disposed so as to be compressed and supported in the axial direction by the support portion and the flange portion, and at least one of the both ends is non-adhesive. Anti-vibration support device characterized by that . 2. The anti-vibration support device according to claim 1, wherein said second rubber elastic body is formed of rubber having a higher damping property than said first rubber elastic body.