JP3846688B2 - Anti-vibration support device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-vibration support device used as a cab mount, a member mount, a body mount, or the like in a vehicle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a vehicle having a full frame structure, for example, when a body (cabin) is attached to a vehicle body frame, an anti-vibration support device such as a cab mount has been adopted so that the body is supported by anti-vibration. As such cab mounts, there are known a compression type utilizing a compression deformation of a rubber elastic body and a shearing type utilizing a shear deformation of a rubber elastic body.
[0003]
The compression type cab mount illustrated in FIG. 4 is formed in a cylindrical shape and has an inner member 101 having flange portions 112, 112 at both ends thereof, and both flange portions are arranged coaxially at a distance from the outer side of the inner member 101. The outer member 102 having a ring-shaped support portion 127 disposed between the flange portions 112 and 112 between the two flange portions 112 and 112, and the flange member 112 and the support portion 127 having both ends fitted into the outer side of the inner member 101. A cylindrical first rubber elastic body 103 disposed so as to be fixed to and supported by compression in the axial direction, and fitted to the outside of the inner member 101 and fixed at one end to the other flange portion 112 and the other The cylindrical second rubber elastic body 104 is arranged so that the end is pressed against the support portion 127 and is compressed and supported in the axial direction.
[0004]
In addition, the shear type cab mount illustrated in FIG. 5 is formed in a cylindrical shape and has an inner member 201 having a flange portion 212 at one end thereof, and a cylindrical shape that is coaxially disposed at a distance from the outer side of the inner member 201. An outer member 202 having a portion 222, and a cylindrical rubber elastic body 203 which is fixed to the inner member 201 and the cylindrical portion 222 and is sheared and supported in the axial direction by the inner member 201 and the cylindrical portion 222; , Is composed of.
[0005]
In both types of cab mounts, the inner members 101 and 201 are fixed to one of the vehicle body frame and the body, and the outer members 102 and 202 are fixed to the other of them, so that the axial direction thereof is vertically Used to be installed in the direction. By attaching a large number of cab mounts in this way, the body is mounted on the vehicle body frame in a state where it is supported in an anti-vibration manner.
[0006]
When vibration is generated on the vehicle body frame side due to the operation of the engine or the like, the vibration is absorbed through elastic deformation of the rubber elastic bodies 103, 104, and 203, and is transmitted from the vehicle body frame to the body. Vibration is effectively reduced. That is, by appropriately setting the characteristics of the rubber elastic bodies 103, 104, and 203 in accordance with the frequency of the vibration intended to be reduced, it is possible to effectively eliminate the humming noise that makes the passenger uncomfortable and the unpleasant vibration that causes the body to shake. Reduced to It should be noted that the low elastic springs of the rubber elastic bodies 103, 104, and 203 are effective for booming noise, and the high attenuation of the rubber elastic bodies 103, 104, and 203 are effective for unpleasant vibrations that tremble. It is.
[0007]
Further, rolling (rolling) of the body with respect to the body frame, pitching (swing in the front-rear direction), and the like, which are generated when the vehicle is running, are effectively suppressed by elastic deformation of the rubber elastic bodies 103, 104, and 203.
[0008]
[Problems to be solved by the invention]
By the way, the compression type cab mount is configured such that the first and second rubber elastic bodies 103 and 104 are compressed and supported in the axial direction (up and down direction), and therefore the axial direction mainly serving as the compression direction. Increased rigidity. For this reason, the first and second rubber elastic bodies 103 and 104 have a structure that cannot secure sufficient rigidity in the radial direction (left and right and front and rear directions of the vehicle). Therefore, it is difficult to set the characteristics of the first and second rubber elastic bodies 103 and 104 in a well-balanced manner so that rolling and pitching that occur when the vehicle is running can be satisfactorily suppressed.
[0009]
On the other hand, the shear type cab mount is configured such that the rubber elastic body 203 is sheared and supported by the inner member 201 and the cylindrical portion 222 in the axial direction (vertical direction). Since the portion 222 is 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), rigidity in the radial direction that is the compression direction is increased. Therefore, in the case of the shear type cab mount, the rigidity in the radial direction of the rubber elastic body 203 can be made sufficiently higher than that of the compression type cab mount.
[0010]
However, in the shear type cab mount, 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 flanged between these portions. It has a structure that is interposed between the portion 212 and the cylindrical portion 222 in a state of being fixed. Therefore, a tensile action is applied to that portion of rubber elastic body 203 (portion indicated by arrow A in FIG. 5) particularly when vibration in the rebound direction (the direction in which inner member 201 and outer member 202 move away in the axial direction) is input. Is input to the flange portion 212 and the cylindrical portion 22, so that a large elongation occurs. If such a pulling action is repeatedly input, a crack occurs in the rubber elastic body 203, and durability may be insufficient.
[0011]
The present invention has been devised in view of the above circumstances, and provides an anti-vibration support device that can be set so as to suppress both axial and radial vibrations in a well-balanced manner and has excellent durability. This is a problem to be solved.
[0012]
[Means for solving the problems, actions and effects of the invention]
An anti-vibration support device according to the first aspect of the present invention that solves the above-described problem is arranged in a coaxial shape with an inner member formed in a cylindrical shape and having a flange portion at one end thereof, and at a distance from the outer side of the inner member. A cylindrical portion that is provided on the flange portion side of the cylindrical portion, extends in a centripetal direction from the cylindrical portion, and is disposed opposite to the flange portion, and an outer peripheral end of the support portion An outer member having a cylindrical holding portion extending toward the flange portion side, and fixed to the inner member and the cylindrical portion and supported by shearing in the axial direction by the inner member and the cylindrical portion. The cylindrical first rubber elastic body arranged in such a manner as to be fitted between the inner member and the holding portion and arranged so that both ends thereof are compressed and supported in the axial direction by the support portion and the flange portion. And at least one of its ends There has been adopted a second rubber elastic body cylindrical, which is a non-adhesive, a means that is composed of.
[0013]
The anti-vibration support device of the present invention is compressed and supported by the first rubber elastic body arranged to be sheared and supported by the cylindrical portions of the inner member and the outer member, and the flange portion of the inner member and the support portion of the outer member. Since the first rubber elastic body secures the necessary rigidity in the radial direction and the second rubber elastic body has the necessary rigidity in the axial direction. Secured by the body. As a result, it is possible to set so that vibrations in both the axial direction and the radial direction are suppressed in a well-balanced manner.
[0014]
Further, since the second rubber elastic body arranged so as to be compressed and supported in the axial direction has at least one of both ends thereof not bonded, when vibration in the rebound direction is input to the second rubber elastic body. No pulling action is input. Therefore, the risk of cracks and the like occurring in the second rubber elastic body is avoided, and the durability is improved.
[0015]
In the vibration isolating support device of the present invention, since the first rubber elastic body and the second rubber elastic body are separated and formed separately, different rubber materials suitable for their arrangement structure are used. They can be formed. As a result, it is possible to easily set the overall characteristics of the first rubber elastic body and the second rubber elastic body to be optimal, and to suppress vibrations in both the axial direction and the radial direction in a balanced manner. It is advantageous to set.
[0016]
Therefore, the anti-vibration support device of the present invention can be easily set so as to suppress the vibration in both the axial direction and the radial direction in a balanced manner, and is excellent in durability.
[0017]
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 made of a rubber having a higher damping property than the first rubber elastic body. The method is adopted.
[0018]
According to this means, by making only the second rubber elastic body have a high damping property, the overall characteristics of the first rubber elastic body and the second rubber elastic body can be improved without increasing the dynamic spring characteristics. It becomes possible to enhance the attenuation. As a result, it is possible to realize both a low dynamic spring effective for an unpleasant sound such as a humming sound generated in the vehicle body and a high attenuation effective for an unpleasant vibration of the vehicle body.
[0019]
As the rubber material forming the second rubber elastic body, for example, diene rubber such as butadiene rubber (BR) or styrene / butadiene rubber (SBR), butyl rubber, or the like can be preferably used.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a cross-sectional view taken along the axial direction of the vibration isolating support device according to the present embodiment, and is a cross-sectional view taken along the line II of FIG. 2, and FIG. 2 is a plan view of the vibration isolating support device.
[0022]
The anti-vibration support device of this embodiment is used as a cab mount that provides anti-vibration support for a cabin installed on a vehicle frame. The vibration-damping support device, as shown in FIGS. 1 and 2, a cylindrical inner member 1 having a flange 12 at one end, a tubular portion 22 which is coaxially disposed outside of the inner member 1, the holding Compression support is provided by the outer member 2 having the portion 26 and the support portion 27, the first rubber elastic body 3 disposed so as to be sheared and supported by the inner member 1 and the cylindrical portion 22, and the support portion 27 and the flange portion 12. The second rubber elastic body 4 is arranged as described above.
[0023]
The inner member 1 is formed of a ferrous metal into a cylindrical shape, and has a cylindrical main body portion 11 and a ring-shaped flange portion that is coupled to one end of the main body portion 11 and protrudes in the centrifugal direction from the outer peripheral surface of the main body portion 11. Twelve. The inner member 1 is provided with a shaft hole 13 extending in the axial direction for inserting a mounting bolt (not shown) or the like.
[0024]
The outer member 2 is formed in a substantially cylindrical shape by an iron-based metal plate, and is coupled to the first member 21 having the cylindrical portion 22 and one end of the first member 21 ( end on the flange portion 12 side) . The second member 25 includes a holding portion 26, a support portion 27, and a mounting flange portion 28. The first member 21 has a cylindrical portion 22 that is formed in a cylindrical shape that is larger than the main body portion 11 of the inner member 1 by a predetermined dimension and that is coaxially disposed outside the main body portion 11 at a distance. A ring-shaped connecting portion 23 extending in the centripetal direction is provided at one end of the cylindrical portion 22 ( end on the flange portion 12 side) . In addition, a ring-shaped bent portion 24 extending in the centrifugal direction is provided at the other end of the tubular portion 22 (end opposite to the flange portion 12) .
[0025]
The second member 25 has a holding part 26 formed in a cylindrical shape slightly larger in diameter and shorter than the cylindrical part 22, and a ring extending in the centripetal direction from one end (end part on the cylindrical part 22 side) of the holding part 26. And a mounting flange portion 28 extending in the centrifugal direction from the other end (end portion on the flange portion 12 side) of the holding portion 26 and having an outer peripheral shape formed in a substantially rhombus shape. The support portion 27 is formed in a ring shape wider than the connecting portion 23 of the first member 21 and is coupled to the outer end surface of the connecting portion 23 by welding. Mounting holes 28a and 28a for inserting mounting bolts (not shown) and the like are provided on both sides in the longitudinal direction of the mounting flange 28, and mounting flanges 28a and 28a are provided around the mounting holes 28a and 28a. Reinforcing rings 29 and 29 are fixed so that the portion 28 is thick. Further, the outer peripheral edge portion of the mounting flange portion 28 is bent to the opposite side to the first member 21.
[0026]
The first rubber elastic body 3 is formed in a substantially cylindrical shape by vulcanizing and molding a rubber material whose main component is natural rubber. The first rubber elastic body 3 is vulcanized and bonded to the outer peripheral surface of the body portion 11 of the inner member 1 and the outer peripheral surface is added to the inner peripheral surface of the cylindrical portion 22 of the outer member 2. Sulfur bonded. Thereby, the 1st rubber elastic body 3 is arrange | positioned so that the inner member 1 and the cylindrical part 22 may carry out shearing support in the axial direction. The first rubber elastic body 3 arranged in this manner sufficiently secures the necessary rigidity in the radial direction.
[0027]
On both end faces of the first rubber elastic body 3, ring-shaped concave portions 31 and 32 are formed in order to adjust the spring constant in the axial direction. Further, a stopper portion 33 is formed at the end portion of the first rubber elastic body 3 on the concave portion 32 side so as to protrude on the outer end surface of the bent portion 24 of the outer member 2.
[0028]
The second rubber elastic body 4 is formed in a substantially cylindrical shape by vulcanizing and molding a highly-damping rubber material mainly composed of styrene-butadiene rubber (SBR). The second rubber elastic body 4 is fitted between the main body portion 11 of the inner member 1 and the holding portion 26 of the outer member 2 so that the inner peripheral surface and the outer peripheral surface of the second rubber elastic body 4 are in contact with them. The both end surfaces are assembled in a state in which they are in contact with the flange portion 12 of the inner member 1 and the support portion 27 of the outer member 2. Thus, the second rubber elastic body 4 is compressed and supported in the axial direction by the flange portion 12 and the support portion 27 of the outer member 2 in a state where the lateral displacement in the radial direction is restricted by the main body portion 11 and the holding portion 26. Are arranged to be. The second rubber elastic body 4 arranged in this way ensures necessary rigidity in the overall axial direction of the first and second rubber elastic bodies 3 and 4.
[0029]
Note that the pulling action is not input to the second rubber elastic body 4 when vibration in the rebound direction (direction in which the flange portion 12 and the support portion 27 move away in the axial direction) is input to both end surfaces of the second rubber elastic body 4. Thus, the support part 27 and the flange part 12 are not bonded.
[0030]
It should be noted that the second rubber elastic body 4 and the first rubber elastic body 3 appropriately have comprehensive characteristics in the axial direction and the radial direction in accordance with the frequency of vibration for the purpose of reducing a booming noise or unpleasant vibration. Is set.
[0031]
The anti-vibration support device of the present embodiment configured as described above is provided on the inner side of a vehicle body frame or body of a vehicle by a mounting bolt (not shown) or the like inserted through the shaft hole 13 of the inner member 1. The member 1 is fixed, and 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 thereof is the vertical direction. It is done. By attaching a large number of anti-vibration support devices in this way, the body is installed on the body frame in a state where the anti-vibration support is provided.
[0032]
Then, when vibration is generated on the vehicle body frame side due to the operation of the engine or the like, the vibration is absorbed through elastic deformation of the first and second rubber elastic bodies 3 and 4, so that the body frame is moved to the body. The transmitted vibration is effectively reduced. That is, humming noise and unpleasant vibration generated in the body are effectively reduced. Further, rolling or pitching of the body with respect to the vehicle body frame, which occurs when the vehicle travels, is effectively suppressed by elastic deformation of the first and second rubber elastic bodies 3 and 4.
[0033]
As described above, the anti-vibration support device of the present embodiment secures the necessary rigidity in the radial direction by the first rubber elastic body 3 disposed so as to be sheared and supported in the axial direction, and compresses in the axial direction. Since the second rubber elastic body 4 arranged so as to be supported is configured to ensure the necessary rigidity in the axial direction, it is set so as to suppress vibrations in both the axial direction and the radial direction in a balanced manner. can do.
[0034]
Further, the second rubber elastic body 4 is configured such that both end faces thereof are non-adhered and the pulling action is not input even when vibration in the rebound direction is input to the second rubber elastic body 4. (2) It is possible to avoid the occurrence of cracks in the rubber elastic body 4, and the durability is excellent.
[0035]
Furthermore, since the first rubber elastic body 3 and the second rubber elastic body 4 are formed separately from each other in the vibration isolating support device of this embodiment, the first rubber elastic body 3 and the second rubber elastic body 4 are integrated. Different rubber materials can be used to optimize the specific 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 damping rubber material mainly composed of SBR. Therefore, it is possible to realize both a low dynamic spring effective for an unpleasant sound such as a humming noise generated in the vehicle body and a high attenuation effective for an unpleasant vibration of the vehicle body.
[0036]
In the present embodiment, both end surfaces of the second rubber elastic body 4 are not bonded to the support portion 27 and the flange portion 12, but only one of the end surfaces is not bonded. May be.
[0037]
In addition, the outer member 2 of the above-described embodiment is formed by joining the first member 21 and the second member 25 formed separately to each other by welding. For example, a single substantially cylindrical metal By subjecting the material to press working or the like, as shown in FIG. 3, it is possible to form the outer member 2A in which the first member 21A and the second member 25A are integrated from the beginning. In this way, the production 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 taken along the axial direction of a vibration isolating support device according to an embodiment of the present invention, and is a cross-sectional view taken along the line II in FIG.
FIG. 2 is a plan view of the anti-vibration support device according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view along the 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 vibration isolating support device.
FIG. 5 is a cross-sectional view taken along the axial direction of another conventional anti-vibration support device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 101, 201 ... Inner member 2, 102, 202 ... Outer member 3, 103 ... 1st rubber elastic body 4,104 ... 2nd rubber elastic body 203 ... Rubber elastic body 11 ... Main-body part 12, 112, 212 ... Flange Part 13: Shaft hole 21 ... First member 22, 222 ... Cylindrical part 23 ... Connection part 24 ... Bending part 25 ... Second member 26 ... Holding part 27, 127 ... Supporting part 28 ... Mounting flange part 28a ... Mounting hole 29 ... Reinforcing rings 31, 32 ... Recess 33 ... Stopper

Claims (2)

An inner member formed in a cylindrical shape and having a flange portion at one end thereof;
A cylindrical portion arranged coaxially with a distance outside the inner member, and provided on the flange portion side of the cylindrical portion and extending in a centripetal direction with respect to the cylindrical portion so as to face the flange portion An outer member having a ring-shaped support portion and a cylindrical holding portion extending from the outer peripheral end of the support portion toward the flange portion side;
A cylindrical first rubber elastic body fixed to the inner member and the cylindrical portion and arranged to be sheared and supported in the axial direction by the inner member and the cylindrical portion;
A cylindrical shape that is fitted between the inner member and the holding portion and arranged so that both ends thereof are 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. A second rubber elastic body,
An anti-vibration support device comprising:   The anti-vibration support device according to claim 1, wherein the second rubber elastic body is made of rubber having a higher damping property than the first rubber elastic body.

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