JP3812304B2 - Anti-vibration support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-vibration support structure such as a lower arm of a vehicle front suspension.
[0002]
[Prior art]
The front suspension in the vehicle employs an independent suspension system in which the left and right wheels independently move up and down, and a strut type as shown in FIG. 4 is well known.
[0003]
This is because the L-shaped lower arm 1 in plan view has a ball joint portion 3 connected to the knuckle of the wheel 2 on the outer side of the front end, and is connected and fixed to the body 4 via a bush on the inner side of the front end. It has a cylindrical front end support portion 5, and has a cylindrical rear end support portion 6 connected and fixed to the body 4 via a bush described later at the rear end portion.
[0004]
As shown in FIG. 5, the rear end support portion 6 includes a bush 100 having an axial center arranged in the vertical direction. This bush 100 has conventionally been made of a natural rubber-based vulcanized adhesive between the inner cylinder 101 and the outer cylinder 102 from the viewpoint of impact input mitigation (riding comfort) when overcoming protrusions and the like and ensuring durability. A hollow straight portion 104 penetrating vertically in the rubber member 103 is formed at a point-symmetrical position.
[0005]
That is, the bush 100 receives a twisting input (see the arrow B in FIG. 4) during the stroke of the front suspension (see the arrow B in FIG. 4). Therefore, if the straight portion 104 is not present, the rubber member 103 is distorted. It becomes excessive and the durability is lowered, so that it cannot withstand long-term use.
[0006]
[Problems to be solved by the invention]
However, the conventional lower arm support structure as described above has the following problems because the straight portion 104 is formed on the bush 100 of the rear end support portion 6.
(1) From the aspect of handling stability, high spring characteristics are required from the beginning, but this is impaired by the presence of the straight portion 104.
(2) A high damping characteristic is required at the time of minute displacement from shimmy and harshness damping properties, but it is damaged by the presence of the straight portion 104.
(3) In order to absorb the shock input smoothly, the characteristic change between the tickling characteristic and the rubber characteristic should be smoothed as much as possible.
[0007]
By the way, in Japanese Utility Model Publication No. 6-35701, the bushing of the rear end support part of the lower arm as described above forms a straight part on the base of a natural rubber-based rubber material, while the outer part of the vehicle is located in the outer direction. Only high-damping rubber material has been combined to suppress the handle shimmy phenomenon, but with this, the high-damping rubber material is compounded over the entire length in the axial direction of the bush. Therefore, there is a problem that the durability of the high-damping rubber material is remarkably impaired due to distortion caused by a twisting input.
[0008]
Accordingly, an object of the present invention is to provide an anti-vibration support structure capable of improving the durability of the bush while having high anti-vibration support performance.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an anti-vibration support structure according to the present invention includes a bush obtained by vulcanizing and bonding a rubber member having a hollow curled portion between an inner cylinder and an outer cylinder, and the bush. And a support arm having a cylindrical portion, wherein the straight portion is provided at two symmetrical points of the rubber member, and a central portion corresponding to the straight portion of the outer tube and the rubber member. Openings communicating with the same curving part are provided at two locations, and a high-attenuation rubber member is partially projected from the opening and fitted into the opening and the curling part .
[0010]
According to this, it is possible to realize high spring characteristics, high damping characteristics, soft contact, and smooth connection characteristics by having effective portions of the high damping rubber member while having a straight portion, while durability of the high damping rubber member is achieved. Can improve the performance.
[0011]
Further, when the bush is arranged with its axis oriented in the vertical direction, it is suitable for supporting the rear end of the lower arm in the strut type vehicle front suspension.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the vibration-proof support structure according to the present invention will be described in detail with reference to the accompanying drawings.
[0013]
[Example]
FIG. 1 is a cross-sectional view of a rear end support portion of a lower arm in a vehicle front suspension showing an embodiment of the present invention, FIG. 2 is a side view of the bush before press-fitting, and FIG. 3 is a plan view of the bush before press-fitting. is there.
[0014]
As shown in FIG. 1, a bush 10 is press-fitted into a cylindrical rear end support portion 6 of a lower arm 1 in a vehicle front suspension with its axis oriented in the vertical direction.
[0015]
As shown in FIGS. 2 and 3 showing the state before press-fitting, the bush 10 is formed in a hollow shape on a natural rubber rubber member 13 vulcanized and bonded between the inner cylinder 11 and the outer cylinder 12. The straight portion 14 is formed at two point-symmetrical locations.
[0016]
And the opening part 12a, 13a connected to the said straight part 14 is provided in two places of the center parts corresponding to the said straight part 14 of the said outer cylinder 12 and the rubber member 13, and the said straight part through this opening part 12a, 13a A block-like high damping rubber member 15 such as urethane rubber or butyl rubber is fitted into 14.
[0017]
Other configurations are the same as those in FIG. 4, and therefore, a duplicate description is omitted here with reference to FIG. 4.
[0018]
Due to such a configuration, the following actions and effects can be obtained by the effective arrangement of the high damping rubber member 15.
(1) The initial (small) displacement characteristics are not staggered like the quick characteristics, and are supported by the high damping rubber member 15 , so that high spring characteristics and high damping characteristics can be obtained, so that steering stability, shimmy, harshness damping characteristics Can be improved.
(2) At the time of impact input, the high-attenuation rubber member 15 softly hits and absorbs the impact, and the connection from the quick characteristics to the rubber characteristics can be made smooth.
(3) Since the high-damping rubber member 15 is inserted into the central portion of the bush, the high-damping rubber member 15 is mainly subjected to compression input, and since the squeezing input is small, durability is improved.
(4) Since the high-attenuation rubber member 15 is fitted into the straight portion 14 through the openings 12a and 13a, a metal fitting or the like for holding the high-attenuation rubber member 15 is unnecessary, and the cost and preparation costs are low.
(5) There is a degree of freedom in the size and arrangement (including the number ) of the high-damping rubber member 15, and the characteristics can be easily tuned.
[0019]
Needless to say, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. For example, the bushing 10 can be arranged with the axis centered in the horizontal (lateral) direction, or the present structure can be applied not only to a suspension but also to an engine mount or the like.
[0020]
【The invention's effect】
As described above, according to the vibration-proof support structure of the present invention, a bush obtained by vulcanizing and bonding a rubber member having a hollow straight portion between an inner cylinder and an outer cylinder, and a cylinder on which the bush is mounted In the anti-vibration support structure provided with a support arm having a shape portion, the straight portion is provided at two points symmetrical with respect to the rubber member, and two central portions corresponding to the straight portion of the outer cylinder and the rubber member An opening communicating with the straight part is provided , and a high-damping rubber member is partially protruded and fitted into the opening and the straight part, so that the effect of the high-damping rubber member has a straight part. Through the interposition, high spring characteristics, high damping characteristics, soft contact and smooth connection characteristics can be realized, while durability of the high damping rubber member can be improved.
[0021]
Further, when the bush is arranged with its axis oriented in the vertical direction, it is suitable for supporting the rear end of the lower arm in the strut type vehicle front suspension.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rear end support portion of a lower arm in a vehicle front suspension according to an embodiment of the present invention.
FIG. 2 is a side view of the bush before press-fitting.
FIG. 3 is a plan view of the bush before press-fitting.
FIG. 4 is a perspective view of a strut type vehicle front suspension.
FIG. 5 is an explanatory view of the structure of a conventional bush.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower arm 2 Wheel 3 Ball joint part 4 Body 5 Front end support part 6 Rear end support part 10 Bush 11 Inner cylinder 12 Outer cylinder 12a Opening part 13 Straight part 13a Opening part 14 Straight part 15 High damping rubber member

Claims (2)

In an anti-vibration support structure comprising: a bush obtained by vulcanizing and bonding a rubber member having a hollow curb portion between an inner cylinder and an outer cylinder; and a support arm having a cylindrical portion to which the bush is attached ,
While providing the straight portion at two points symmetrical to the rubber member,
An opening communicating with said barrel and the hollow portion in the center two positions corresponding to the hollow portion of the rubber member is provided,
A vibration-damping support structure, wherein a high-attenuation rubber member is partly projected from the opening and fitted into the opening and the straight part .   The anti-vibration support structure according to claim 1, wherein the bush is disposed with its axis oriented in the vertical direction.

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