JPH0328192Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vibration-proof bushing for a vehicle, and more particularly to the structure of a vibration-proof bushing used in a connecting portion of a strut bar.

[Conventional technology]

A conventional example of a vibration-proof bushing used for a strut bar is shown in FIG. In the figure, anti-vibration bushings 1A and 1B are fitted into mounting holes 2a of a bracket 2 provided in the vehicle frame through both openings, and the thickness of each anti-vibration bushing 1A and 1B gradually increases toward the outer end. It is a cylindrical body whose inner ends are positioned adjacent to each other.

An inner cylinder 11 is penetrated and joined to the inner periphery of each of the vibration isolating bushes 1A and 1B, and a small diameter portion 41 at one end of the strut bar 4 is inserted into the communicating inner cylinder 11. Each of the vibration isolating bushes 1A and 1B is held by a retainer plate 43 provided on the small diameter portion 41 in contact with the outer end surface, and the strut bar 4 is held by a nut 42 screwed onto the small diameter portion 41.
It is held by the bracket 2 via A and 1B.

At the outer ends of the anti-vibration bushings 1A and 1B, there is a cylindrical insert 3' that curves outward and expands inside near the outer periphery.
is buried, and this is used to protect the vibration isolating bush 1 from the load input from the strut bar 4, especially in the axial direction.
This prevents deformation of A and 1B and improves their durability.

[The problem that the idea aims to solve]

By the way, holding the strut bar allows its posture to change relatively freely in the longitudinal direction of the vehicle, which is the axial direction, and in the vertical direction of the vehicle, which is perpendicular to the axis.
In order to ensure steering stability, it is necessary to restrict changes in attitude of the vehicle in the left and right directions perpendicular to the axis.

Therefore, as shown in Fig. 5, anti-vibration bushing 1
Insert plates 31'a and 31'b are embedded in parallel to the strut bar 4 at the inner end portions of A and 1B, approximately at the center of the wall thickness on both sides of the strut bar 4,
It is conceivable to increase the spring constant of the anti-vibration bushings 1A and 1B in the lateral direction of the vehicle, but this would increase the number of components and complicate the mold structure for holding the insert plate during molding of the anti-vibration bushings. This results in increased costs.

The present invention solves this problem by increasing the spring constant of the anti-vibration bushing in a predetermined direction perpendicular to the axis at low cost without complicating the mold structure or increasing the number of components, thereby improving the quality of the strut bar. The object of the present invention is to provide an anti-vibration bushing for a vehicle.

[Means to solve the problem]

To explain the configuration of the present invention with a diagram, the bracket 2
Cylindrical anti-vibration bushings 1A and 1B are fitted into the mounting hole 2a from both openings, respectively, and one end of a vehicle strut bar 4 is inserted and held in these anti-vibration bushings 1A and 1B.

A cylindrical insert 3 is embedded in the outer end of each of the vibration isolating bushes 1A, 1B, the diameter of which decreases inward from the flange portion 32 at the outer end with an enlarged diameter, and The insert 3
At the inner end of the anti-vibration bushing 1, approximately the center of the wall thickness of the anti-vibration bushings 1A and 1B is placed from opposite positions in the radial direction.
A, 1B toward the inner end of the strut bar 4
A pair of projecting pieces 31a, 31b are extended substantially parallel to the above.

[Effect]

In the present invention, each protrusion 31a, 31b extending from the radially opposite position of the cylindrical insert 3 is
Since the anti-vibration bushings 1A and 1B are interposed approximately parallel to the strut bar 4 at the center of their wall thickness, the anti-vibration bushings 1A and 1B are
The spring constant of is sufficiently large to effectively restrict the attitude change of the strut bar 4 in this direction.

Since the projecting pieces 31a and 31b are integrally formed with the insert 3, the number of parts does not increase and the mold does not become complicated.

Furthermore, since the insert is provided with a flange portion, the insert can be easily held within the mold.

〔Example〕

In FIG. 1, vibration-proof bushings 1A and 1B of the same shape are fitted symmetrically into a mounting hole 2a of a bracket 2 provided in a vehicle frame through both openings, and their inner ends are in contact with each other. Each of the anti-vibration bushings 1A and 1B is a cylindrical body whose wall thickness gradually increases from the inner end toward the outside. , the diameter decreases toward the outer end surface.

An inner cylinder 11 is penetrated and joined to the inner circumferential surface of each of the vibration isolating bushes 1A, 1B, and a small diameter portion 41 at one end of the strut bar 4 is inserted through the inner cylinders 11 which communicate with each other. This small diameter portion 41 is provided with retainer plates 43 at the base end and the distal end thereof, and these retainer plates 43 abut against the outer end surfaces of the vibration isolating bushes 1A and 1B to hold them. The strut bar 4 is fixedly connected by a nut 42 screwed onto the tip of a small diameter portion 41.

An insert 3 is embedded in each of the vibration-proof bushings 1A and 1B. Each insert 3 is a cylindrical body as shown in FIGS. 2 and 3, and its outer end is curved and expanded outward to form a flange portion 32, and a vibration-proofing bushing is attached along the opening edge of the bracket mounting hole 2a. It extends into the large diameter flange portions of 1A and 1B, and a portion of the tip is exposed. The inner end of the insert 3 is bent toward the center of the cylinder to reduce its diameter, and a pair of projecting pieces 31a and 31b extend horizontally from the inner end at radially symmetrical positions. The projecting pieces 31a, 31b have an arcuate cross section, and extend approximately parallel to the strut bar 4 at approximately the center of the wall thickness of the inner end of the vibration isolating bushings 1A, 1B.

Note that since the insert has a flange portion in a part thereof, the insert can be easily held within the mold during rubber molding.

With the anti-vibration bushings 1A and 1B installed, the direction in which the protrusions 31a and 31b are connected is aligned with the left-right direction of the vehicle.

The vibration-proof bushings 1A and 1B having such a structure have a relatively small spring constant in the axial direction of the strut bar 4 and in the vertical direction of the vehicle perpendicular to the axis. Therefore,
The strut bar 4 can be moved relatively freely in the axial direction and pried in the vertical direction of the vehicle. Especially when the strut bar 4 moves in the axial direction, a larger load is applied to the anti-vibration bushings 1A and 1B.
Deformation of the anti-vibration bushings 1A, 1B is effectively prevented by the cylindrical insert 3, and its durability is maintained.

On the other hand, since the anti-vibration bushings 1A and 1B have projections 31a and 31b located inside the vehicle in the left-right direction, the spring constant in this direction is sufficiently large, and the strut bar 4 in this direction has a sufficiently large spring constant. Pry displacement is reliably regulated.

[Effect of idea]

As described above, the anti-vibration bushing of the present invention increases the spring constant of the anti-vibration bushing in the radial direction by extending the projecting pieces at symmetrical positions in the radial direction of the cylindrical insert provided inside. , it is possible to effectively restrict the posture change of the strut bar in this direction.

Since the projecting piece is integrally formed with the cylindrical insert, there is no need to embed a separate member, and an increase in the number of parts and a complicated mold during molding can be avoided.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, with Figure 1 being a cross-sectional view of the strut bar connection section provided with the anti-vibration bushing, Figure 2 being a side view of the insert, and Figure 3 being its front view. , FIG. 4, and FIG. 5 are sectional views of a strut bar connecting portion showing conventional examples. 1A, 1B... Anti-vibration bushing, 2... Bracket, 2a... Mounting hole, 3... Insert, 31
a, 31b...projection piece, 32...flange part, 4...
...strut bar.

Claims (1)

[Scope of utility model registration request] A cylindrical anti-vibration bushing is inserted into each of the mounting holes of the bracket through both openings thereof, and one end of the vehicle strut bar is inserted and held within these anti-vibration bushes, and each of the above-mentioned anti-vibration bushes has a
A cylindrical insert whose diameter decreases inward from the flange part at the outer end with an enlarged diameter is embedded, and at the inner end of the insert there is a cylindrical insert whose diameter is reduced from the radially opposite position to A vibration-proof bushing for a vehicle, characterized in that a pair of protrusions extend substantially parallel to the strut bar with the substantially center thereof facing the inner end of the vibration-proof bushing.