JP2002333045A - Vibration controlling bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration controlling bush capable of being easily pressed into a collar member with no inclination or offset and kept in a stably pressed-in and fixed condition. SOLUTION: The vibration controlling bush comprises a cylindrical bush fitting 1 and a cylindrical rubber elastic body 2 vulcanized and bonded to the outer periphery face of the bush fitting 1 with flange edges 3 formed at both axial ends, the rubber elastic body 2 having a main rubber portion 4 located at both flange edges 3, 3 and pressed and fixed into the mounting collar member C, wherein axial grooves 6 are provided in the outer periphery face of the main rubber portion 4 of the rubber elastic body 2 at required spaces in the peripheral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration bush used mainly in a suspension mechanism of an automobile.

[0002]

2. Description of the Related Art Conventionally, in a suspension of a vehicle such as an automobile, a connecting portion between a member on a vehicle body and a member on a supporting side of the suspension, for example, a member such as a link or an arm, is provided. An anti-vibration bush is used for the purpose of buffering.

As such a vibration-proof bush, for example, FIG.
As shown in (1), a bush is known in which a cylindrical rubber elastic body (52) having a circular cross section of a required thickness is fixed to the outer peripheral surface of a cylindrical inner cylindrical fitting (51) by vulcanization bonding means. ing. The rubber isolator (52) is press-fitted and fixed to a mounting hole of a support-side member such as the arm via a collar member (C) also serving as an outer cylinder.
Usually, flange edges (53) are provided at both ends in the axial direction of the rubber elastic body (52) to facilitate axial positioning when press-fitting the collar member and to suppress excessive axial displacement in the assembled state. ) Is provided.

In the above-mentioned vibration-proof bush, the outer diameter of the main rubber portion (54) between the flange edges (53) and (53) of the rubber elastic body (52), which is a press-fit portion to the collar member (C). Is formed slightly larger than the inner diameter of the collar member (C), that is, the press-fitting diameter, and the main rubber portion (54) is compressed so that the stability of the press-fitting state can be secured. A peripheral groove (55) is formed between the main rubber portion (54) and the flange edge (53) so that the flange edge (53) can escape during the press-fitting.

If the main rubber portion (54) as the press-fit portion has the same diameter over the entire length, the larger the outer diameter becomes, the larger the press-fit diameter (the inner diameter of the collar member) becomes. The rubber volume is too large,
Pressing into the collar member becomes difficult, and there is a risk of rubber cracking or breakage. On the other hand, if the outer diameter of the main rubber portion is reduced, the fixed state by press fitting becomes unstable.

Therefore, in order to facilitate the press-fitting and to secure the fixed state, as shown in FIG. 6, a circumferential groove is formed in the axially intermediate portion of the main rubber portion (54) serving as the press-fitting portion. It has been proposed to form (56) and reduce the rubber volume while securing the outer diameter.

However, in this case, in the process of press-fitting the collar member in the axial direction, there is a convex portion having a large outer diameter and the concave groove portion (56) having a smaller diameter than the convex portion. There is a possibility that the axis of the vibration bush is inclined and eccentric with respect to the axis of the collar member. If the eccentricity occurs, there arises a problem that a connecting member such as a bolt cannot be inserted into the inner cylinder fitting (51).

The present invention has been made in view of the above, and is capable of easily press-fitting a collar member without fear of tilting or eccentricity and maintaining a stable press-fit fixed state. .

[0009]

According to the present invention, there is provided an anti-vibration bush according to the present invention, comprising: a cylindrical inner cylinder; a vulcanized adhesive on an outer peripheral surface of the inner cylinder; A vibration-proof bush comprising a cylindrical rubber elastic body having a flange edge formed thereon, wherein a main rubber portion between both flange edges of the rubber elastic body is press-fitted and fixed to a mounting collar member, An axial groove is provided on the outer peripheral surface of the main rubber portion of the rubber elastic body at required intervals in the circumferential direction.

According to this vibration-isolating bush, the rubber volume of the main rubber portion of the rubber elastic body at the outer peripheral portion is reduced by the axial groove, so that when the rubber member is pressed into the mounting collar member. In spite of the fact that the outer diameter of the main rubber portion is larger than the inner diameter of the collar member, the rubber portion between the grooves is compressed so as to crush the space of the groove, so that the rubber member can be securely pressed into the collar member without any problem. Is done.

Particularly, since the groove on the outer periphery of the main rubber portion is formed in the axial direction, the main rubber portion is substantially uniformly compressed and pressed at any position in the axial direction. For this reason, at the time of press-fitting, the bushing axis is inclined with respect to the axis of the collar member, and the press-fitting can be performed without fear of eccentricity, and a good and stable press-fitting state can be obtained. In addition, the axial length of the collar member can be increased, and a more stable press-fit state can be maintained.

In the above-described press-fit state, the flange edges at both ends are positioned in contact with both end surfaces of the collar member.

In the above-mentioned vibration-proof bush, it is preferable that a peripheral groove is formed between the main rubber portion of the rubber elastic body and both flange edges to absorb a bending deformation of the flange edge at the time of press-fitting. Thereby, at the time of press-fitting to the collar member, the flange edge can be elastically bent and deformed into the portion of the peripheral groove so that the flange can be press-fitted without any problem. Since a plurality of grooves in the direction are formed, press-fitting can be performed without causing inclination or eccentricity as described above. Also, the axial groove is
It is preferable that the groove is formed at an interval of about twice or more the width of the groove, and is formed so that the portion between the grooves is crushed by press-fitting the collar member. Accordingly, there is no gap between the main rubber portion of the rubber elastic body and the collar member due to the groove, and the press-fit state is further stabilized.

Further, the depth of each groove in the axial direction is set such that the diameter of a circle inscribed in the bottom surface is slightly smaller than the inner diameter of the collar member smaller in diameter than the outer diameter of the main rubber portion. Are preferred. Thereby, a strong and stable press-fit state is obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of a vibration isolating bush according to the present invention, before press-fitting into a mounting collar member, and FIG.
3 is a cross-sectional view taken along the line II-II, FIG. 3 is a vertical cross-sectional view in a state where the collar member is press-fitted, and FIG.

The anti-vibration bush (A) of this embodiment has a required thickness on the outer peripheral surface of a cylindrical inner tube fitting (1) mainly attached to a member (B) such as a connecting rod on the vehicle body side of an automobile. A cylindrical rubber elastic body (2) having a circular cross section is vulcanized and bonded. At both ends in the axial direction of the rubber elastic body (2), in order to facilitate axial positioning at the time of press-fitting the collar member (C) also serving as an outer cylinder, and to suppress excessive axial displacement in an assembled state. Flange edge of (3) (3)
Are formed integrally, and the flange edges (3) and (3)
The portion between them is formed as a main rubber portion (4) to be a press-fit portion to the collar member (C). A circumferential groove (5) is provided between flange edges (3) and (3) at both axial ends of the main rubber portion (4) to absorb bending deformation of the flange edges (3) and (3) during the press-fitting. (5) is formed. The collar member (C) forms a mounting hole in a support-side member such as an arm of a suspension.

In the vibration isolating bush (A), the outer peripheral surface of the main rubber portion (4), which is a press-fit portion of the rubber elastic body (2), has an axial groove (6) extending over its entire length. A plurality is provided at each required interval in the direction, preferably at equal angular intervals.

The main rubber portion (4) has a press-fit diameter whose outer diameter is the press-fitting diameter in consideration of the stability in a press-fit state of the collar member (C) in relation to rubber hardness. It is formed slightly larger than the inner diameter of (C).

Further, the axial groove (6) is
The groove depth is set such that the diameter of the circle inscribed in the bottom surface is substantially the same as or slightly smaller than the inner diameter of the collar member (C).

Further, the number and intervals of the axial grooves (6) can be set arbitrarily, but in practice, they are formed at intervals of at least about twice the groove width in the circumferential direction, and the collar member is formed. It is preferable that the portion between the grooves (6) and (6) be elastically crushed by press-fitting into (C). In particular, it is preferable that the rubber volume is formed at four or more positions at equal angular intervals because the rubber volume in the circumferential direction is uniform.

The anti-vibration bush (A) of the above embodiment is shown in FIG.
As described above, the support member such as the arm of the suspension is press-fitted and fixed to the collar member (C) provided to form the mounting hole. Then, a member (B) such as a connecting rod on the vehicle body side is inserted into and fixed to the inner cylinder fitting (1).

When press-fitting the collar member (C),
The flange edge (3) of the rubber elastic body (2) is elastically deformed and pushed into the inner circumferential groove (5) so as to be bent, and further has a main diameter larger than the inner diameter of the collar member (C). The rubber part (4) is press-fitted while being elastically compressed. The flange edge (3) is exposed from the end of the collar member (C) by pushing out.

In the press-fitting process, since an axial groove (6) is formed on the outer peripheral portion of the main rubber portion (4), the rubber volume is smaller than that of a groove having substantially the same diameter and having no groove. Therefore, despite the fact that the outer diameter of the main rubber portion (4) is larger than the inner diameter of the collar member, the rubber portion between the grooves (6) and (6) occupies the space of the groove (6). It is compressed so as to be crushed, and is securely pressed into the collar member (C) without any problem. In particular, since the groove (6) is formed in the axial direction, the main rubber portion (4) is substantially uniformly compressed and pressed at any position in the axial direction. Therefore, the bush axis is inclined with respect to the axis of the collar member (C), so that the bush can be directly press-fitted without causing eccentricity.
In particular, even if the length of the collar member (C) in the axial direction is increased, press-fitting can be similarly performed. Therefore, a good and stable press-fit state can be obtained. Particularly, as shown in FIG. 4, the rubber elastic body (2) is compressed so that no gap is formed between the main rubber portion (4) and the collar member (C) by the groove (6). , And the press-fit state becomes more stable.

In the state where the press-fitting is completed, the flange edges (3) and (3) at both ends are positioned by being in contact with the end face of the collar member (C).

In the above-described embodiment, the case where the anti-vibration bush (A) of the present invention is directly press-fitted into the collar member (C) provided on the support side member such as the arm has been described. The same applies to the case of press-fitting into a collar member as an outer tube fitting.

[0027]

As described above, according to the vibration isolating bush of the present invention, the main rubber portion of the rubber elastic body forming the outer peripheral portion is accurately and easily pressed into the collar member without fear of inclination or eccentricity. As a result, it is possible to obtain a press-fit fixed state with good stability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an anti-vibration bush according to the present invention, before press-fitting a mounting collar member.

FIG. 2 is a cross-sectional view taken along the line II-II of the previous figure.

FIG. 3 is a longitudinal sectional view showing a state in which the vibration-isolating bush is press-fitted into a collar member.

FIG. 4 is a cross-sectional view taken along the line IV-IV in the previous figure.

FIG. 5 is a longitudinal sectional view showing an example of a conventional anti-vibration bush before being press-fitted into a mounting collar member.

FIG. 6 is a longitudinal sectional view showing another example of a conventional anti-vibration bush before being press-fitted into a mounting collar member.

[Description of sign]

 (A) Anti-vibration bush (B) Body side member (C) Collar member (1) Inner tube fitting (2) Rubber elastic body (3) Flange rim (4) Main rubber part (5) Circumferential groove (6) Shaft Directional groove

Continued on front page F-term (reference) 3J048 AA01 BA19 EA17 3J059 AA03 AD05 BA54 BA58 BA73 BC06 BD01 CA14 CB16 DA14 EA14 GA02

Claims (4)

[Claims] The rubber elastic body comprises a cylindrical inner cylinder fitting, and a cylindrical rubber elastic body which is vulcanized and bonded to the outer peripheral surface of the inner cylinder fitting and has flange edges formed at both ends in the axial direction. A main rubber portion between the two flange edges of the body is a vibration-isolating bush that is press-fitted and fixed to a mounting collar member, and an axial groove is formed on an outer peripheral surface of the main rubber portion of the rubber elastic body in a circumferential direction. A vibration-isolating bush is provided at every required interval. 2. The vibration-isolating bush according to claim 1, wherein a circumferential groove is formed between the main rubber portion of the rubber elastic body and both flange edges to absorb bending deformation of the flange edge during press-fitting. 3. The axial groove is formed at an interval of at least about twice the groove width, and is formed so as to be crushed at a portion between the grooves by press fitting into a collar member. Or the vibration isolating bush according to 2. 4. The depth of each of the grooves in the axial direction is set such that the diameter of a circle inscribed in the bottom surface is slightly smaller than the inner diameter of a collar member smaller in diameter than the outer diameter of the main rubber portion. The anti-vibration bush according to any one of claims 1 to 3.