JP2003294084A - Anti-vibration bush - Google Patents

Abstract

(57) [Problem] To provide a light-weight and low-cost stopper for limiting excessive displacement in the axial direction of a mounting cylinder part in a vibration-isolating bush attached to a vehicle-body-side coupling portion of a lower arm. SOLUTION: A core member 12 having mounting holes 24 at both ends 22 and a vibration-proof base 14 made of a rubber-like elastic body fixed to the outer periphery of a columnar body 20 of the core member are provided. At the vibration isolating bush 10 which is press-fitted into the mounting cylinder portion 6 and fixed to the lower arm and fixed to the vehicle body 3 with bolts 30 passing through the mounting holes 24, it is mounted at one axial end of the body portion 20 of the core member 12. A stopper flange 26 for limiting the displacement of the cylindrical portion 6 to one side in the axial direction is integrally protruded, and the other end of the body portion 20 in the axial direction limits the displacement of the mounting cylindrical portion 6 to the other side in the axial direction. The stopper ring 18 was fixed by press fitting.

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 in a connecting portion between a vibration source and a vehicle body in a vehicle such as an automobile.

[0002]

2. Description of the Related Art Conventionally, for example, in a suspension of an automobile, it is arranged at a vehicle body side connecting portion of a lower arm (also referred to as a transverse link) that supports wheels with respect to the vehicle body. As a vibration-proof bush for vibration-proofly connecting the lower arm and the vehicle body, a core member having mounting holes for the vehicle body at both ends and a columnar body portion in the center portion, and fixed to the outer periphery of the body portion by vulcanization molding. There is a bush consisting of a vibration-proof base.

FIG. 8 shows an example thereof, in which a vibration-proof bushing 100 has a core member 101 extending in the axial direction,
An anti-vibration substrate 103 made of a rubber-like elastic material is fixed to the outer periphery of the columnar body 102 at the center by vulcanization molding. The vibration-proof bushing 100 is press-fitted into the mounting cylinder part 110 so that the mounting cylinder part 110 of the lower arm is mounted on the outer periphery of the vibration-proof base 103, and thereby fixed to the lower arm. Further, mounting holes 104, 104 penetrating in a direction perpendicular to the axis are provided at both ends of the core member 101 in the axial direction,
Bolts 111, 111 are inserted through these mounting holes to make the vehicle body 1
The vibration-proof bushing 100 is fixed to the vehicle body 112 by tightening together with the nuts 113 on the 12 side.

By the way, in this type of vibration-proof bushing, it is necessary to limit excessive displacement in the axial direction of the mounting cylinder portion of the lower arm to prevent it from coming off. Therefore, in the example shown in FIG. 8, a stopper flange 105 is integrally provided on one end side of the body portion 102 of the core member 101 in the axial direction. However, on the other end side in the axial direction, the stopper flange cannot be integrally provided on the core member 101 in this way. As described above, since the vibration-proof bushing 100 is press-fitted in the lower arm mounting cylinder portion 110 in the axial direction to be mounted, if the stopper flanges are provided at both ends of the body portion 102 in the axial direction, the mounting cylinder portion 110 cannot be mounted. This is because press fitting cannot be performed. Therefore, on the other end side in the axial direction, a stopper fitting 106 that is separate from the core member 101 is used, and this is fixed by the bolt 111.

However, the stopper fitting 1
When 06 is fixed to the core member 101 with the bolt 111, the stopper fitting 106 has a fixing surface portion 107 for fixing with the bolt 111 and a connecting portion 108 for connecting the fixing surface portion 107 and the stopper body. It becomes necessary to complicate the shape of the parts, resulting in high part cost and heavy part weight. Also, the vibration-proof bush 10
When attaching 0 to the vehicle body 112, the stopper metal fitting 106
Must be fastened with the bolts 111, which impairs the mounting workability.

The present invention has been made in view of the above points, and has a lightweight and low-cost structure for a stopper that limits excessive displacement of the mounting cylinder in the axial direction, and is excellent in workability for mounting on a vehicle body or the like. The purpose is to provide an anti-vibration bush.

[0007]

A vibration-proof bushing according to the present invention comprises a core member having mounting holes at both ends in the axial direction and a columnar body in the center, and a rubber fixed to the outer periphery of the body. A vibration-damping base made of elastic body, is press-fitted into a mounting cylinder of a first member of a vehicle and fixed to the first member, and
An anti-vibration bush fixed to a second member of a vehicle by a bolt that passes through the mounting hole and vibration-proofly coupled to the first member and the second member. A stopper flange for integrally restricting the displacement of the mounting cylinder portion to one side in the axial direction is integrally projected at one end in the direction, and a stopper for restricting the displacement of the mounting cylinder portion to the other side in the axial direction at the other end in the axial direction. The ring is fixed by press fitting.

In the vibration-proof bushing of the present invention, a press-fitting type stopper ring is used as a stopper for limiting the displacement of the mounting cylinder portion to the other side in the axial direction, and the body portion of the core member is press-fitted into the stopper ring. The stopper ring is fixed to the core member. Therefore, the stopper no longer requires the fixing surface portion for the bolt as in the conventional case, so that the shape of the parts is simplified and the cost and the weight are reduced. In addition, when attaching the anti-vibration bush to the vehicle body or the like, it is not necessary to fasten the bolt while the separate stopper is directed, unlike in the conventional case described above, so that the attaching workability is not impaired.

In the vibration-proof bushing of the present invention, the vibration-proof base may be embedded with an intermediate cylinder that concentrically surrounds the core member. By burying such an intermediate cylinder,
The rigidity of the vibration-proof bushing in the direction perpendicular to the axis can be increased.

In the vibration-proof bushing of the present invention, an outer cylinder concentrically surrounding the core member may be provided, and the outer cylinder and the core member may be coupled by the vibration-proof base body interposed therebetween. In this case, the mounting cylinder portion of the first member is mounted on the outer circumference of the outer cylinder, and compared with the case where the mounting cylinder portion is directly mounted on the vibration-isolating base, the input in the circumferential direction from the mounting cylinder portion is performed. It is possible to reduce the friction factor with respect to and reduce the loss factor.

In the vibration-proof bushing of the present invention, the stopper ring may be provided with a stopper rubber on the inner surface side in the axial direction. As a result, it is possible to prevent the rigid bodies from contacting each other between the stopper ring and the mounting cylinder portion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An anti-vibration bush 10 according to a first embodiment of the present invention will be described with reference to FIGS.

The anti-vibration bush 10 is used as a front bush in the lower arm 1 of the front suspension shown in FIG. The lower arm 1 is a member that supports the wheels 2 with respect to the vehicle body 3. The lower arm 1 includes a mounting portion 5 for a ball joint at one end of an arm portion 4 extending in the vehicle width direction, and a front bush 10 is mounted at the other end. And a mounting portion 8 for a rear bush at the tip of a branch arm 7 that branches from the arm portion 4 and extends rearward of the vehicle.

As shown in FIG. 1, the vibration-proof bushing 10 is
It is composed of a metal core member 12 extending in the axial direction, a vibration-damping base body 14 made of a rubber-like elastic body, a metal intermediate cylinder 16, and a metal stopper ring 18.

The core member 12 is composed of a cylindrical body portion 20 as a central portion, and both end portions 22, 22 formed on both axial sides thereof to be flatter than the body portion 20. Both ends 2
Mounting holes 24, 24 are formed in the shafts 2, 22 so as to penetrate in a direction perpendicular to the axis and in parallel with each other.

The vibration-proof substrate 14 is fixed to the outer periphery of the body portion 20 of the core member 12 by vulcanization molding. An intermediate cylinder 16 which surrounds the core member 12 concentrically and in parallel with the axis is embedded at a substantially intermediate position in the thickness direction (axis-perpendicular direction) of the vibration-isolating base 14, whereby the vibration-isolating bush 10 in the axis-perpendicular direction. The rigidity is set high.

A stopper flange 26 is integrally provided on the body portion 20 of the core member 12 at one axial end thereof to limit the excessive displacement of the mounting cylinder portion 6 toward the one axial side. The stopper flange 26 is arranged at a predetermined interval in the axial direction between the stopper flange 26 and the mounting tubular portion 6, and abuts when the mounting tubular portion 6 is excessively displaced in the axial direction toward the flange 26. , Which limits displacement further. The stopper flange 26 has an annular shape so as to receive the mounting tubular portion 6 over the entire circumference thereof, and its outer diameter is set to be approximately the same as the outer diameter of the mounting tubular portion 6.

At the other end of the core member 12 in the axial direction (the end portion on the side opposite to the stopper flange 26) of the body portion 20, the excessive displacement of the mounting cylinder portion 6 to the other side in the axial direction is restricted. The stopper ring 18 is fixed by press fitting. The stopper ring 18 is similar to the stopper flange 26 in that
And the mounting cylinder 6
Abut on the ring 18 when it is displaced in the axial direction, and limit the further displacement, so that the mounting cylinder portion 6 can be received over the entire circumference.

The stopper ring 18 is configured such that the body portion 20 of the core member 12 is axially press-fitted into the hollow portion of the stopper ring 18.
It is fixed to the outer peripheral surface of 0. Therefore, the hollow portion of the stopper ring 18 is larger than the end portion 22 of the core member 12 so that the end portion 22 of the core member 12 can be inserted freely, and the hollow portion of the body portion 20 is fixed to the outer periphery by press fitting. It is set to almost the same size as. The outer diameter of the stopper ring 18 is set to be approximately the same as the outer diameter of the mounting tube portion 6.

Between the axial ends of the mounting cylinder portion 6 and the stopper flange 26 and the stopper ring 18 which face the axial ends, in order to prevent rigid bodies from contacting each other between the mounting cylinder portion 6 and these stoppers, A stopper rubber 28 is provided. The stopper rubber 28 is integrally extended from the anti-vibration substrate 14 and is in contact with the end surface of the mounting tubular portion 6 so as to support both ends of the mounting tubular portion 6, and a gap is provided between the stopper flange 26 and the stopper ring 18. Is secured.

Before the stopper ring 18 is fitted, the vibration-proof bushing 10 of this embodiment is press-fitted into the mounting cylinder portion 6 of the lower arm, and thereby fixed to the lower arm. Then, the end portion 22 of the core member 12 is attached to the stopper ring 1
8 and the stopper ring 18 is press-fitted and fixed to the outer periphery of the body 20 of the core member 12. Next, as shown in FIG. 1, the anti-vibration bush 10 is attached to the vehicle body 3 using bolts 30 and nuts 32. Specifically, the mounting holes 24, 24 of the both end portions 22, 22 of the core member 12 are
By inserting the bolts 30, 30 into the vehicle body and tightening them together with the nuts 32, 32 welded to the vehicle body 3 in advance, the core member 1
Both ends 22, 22 of 2 are fixed to the vehicle body 3. As a result, the lower arm and the vehicle body are vibrationally coupled via the vibration isolation bushing 10.

The vibration-proof bushing 1 of this embodiment having the above-mentioned configuration
When it is 0, the stopper for limiting the excessive axial displacement of the mounting cylinder portion 6 on the side opposite to the stopper flange 26 is constituted by the press-fitting type stopper ring 18, so that the shape of the stopper component is simplified, Cost reduction and weight reduction can be achieved. Further, when the vibration-proof bushing 10 is attached to the vehicle body 3, it is not necessary to fasten the bolts while the separate stopper is addressed, so that the attaching workability is not impaired.

Next, an anti-vibration bush 40 according to the second embodiment will be described with reference to FIGS. However, the first
The parts denoted by the same reference numerals as those in the embodiment have the same configuration unless otherwise specified, and the description thereof will be omitted.

In the second embodiment, the outer cylinder 42 surrounding the core member 12 and the intermediate cylinder 16 coaxially and concentrically is provided, and the vibration-proof base 14 is interposed between the outer cylinder 42 and the core member 12. Then, the outer cylinder 42 and the core member 12 are elastically coupled by the vibration-proof base 14. Therefore, in this embodiment, the mounting cylinder portion 6 of the lower arm is fitted to the outer peripheral surface of the outer cylinder 42, whereby the friction against the circumferential input from the mounting cylinder portion 6 is reduced and the loss factor is reduced. can do.

Further, in this embodiment, the end surface of the vibration-proof substrate 14 on the stopper ring 18 side is axially arranged between the outer cylinder 42 and the intermediate cylinder 16 and between the intermediate cylinder 16 and the core member 12. The recesses 44 and 46 that are depressed are provided to improve the durability of the anti-vibration substrate 14. The recesses 44 and 46 can be formed by forming the stopper for restricting the displacement of the mounting tube portion 6 to the other side by the press-fitting type stopper ring 18. That is, since the stopper ring 18 is press-fitted after the vulcanization molding of the vibration-proof substrate 14 and does not exist during vulcanization molding, the recess 44,
A mold for molding 46 can be placed and this can be axially withdrawn after vulcanization. On the other hand, the end face of the vibration-proof base 14 on the stopper flange 26 side cannot be provided with such a recess because of the relationship with the die-drawing direction, and is therefore formed flat.

In the second embodiment, the stopper ring 18
The stopper rubber on the side is provided separately from the vibration isolating substrate 14, and more specifically, a stopper rubber 48 fixed by vulcanization molding is provided on the inner surface of the stopper ring 18 in the axial direction. The stopper rubber 48 has an annular shape similar to the stopper ring 18, and is arranged so as to secure a gap in the axial direction between the stopper rubber 48 and the mounting tubular portion 6. The outer diameter of the stopper rubber 48 is set to be approximately the same as the outer diameter of the mounting tubular portion 6 in order to prevent the rigid bodies from contacting each other between the stopper ring 18 and the mounting tubular portion 6. Further, the inner diameter is set to be equal to or less than the inner diameter of the intermediate cylinder 16 so as to prevent the rigid bodies from contacting each other between the outer cylinder 42 and the intermediate cylinder 16 and the stopper ring 18.

The stopper rubber 50 on the stopper flange 26 side is integral with the vibration-proof base 14 as in the first embodiment, but in this embodiment, it is vulcanized and bonded to the axially inner surface of the stopper flange 26. A gap is secured in the axial direction between the stopper rubber 50 and the mounting cylinder portion 6.

[0028]

According to the vibration-proof bushing of the present invention, since the press-fitting type stopper ring is used as the stopper for limiting the axial displacement of the mounting cylinder portion, the shape of the stopper component is simplified and the cost is reduced. It is lightweight and has excellent workability when attaching the anti-vibration bush to the vehicle body.

[Brief description of drawings]

FIG. 1 is a sectional view of an anti-vibration bush according to a first embodiment of the present invention.

FIG. 2 is a plan view of the vibration damping bush.

FIG. 3 is a side view of the vibration damping bush.

FIG. 4 is a cross-sectional view of an anti-vibration bush according to a second embodiment.

FIG. 5 is a plan view of the vibration damping bush.

FIG. 6 is a side view of the vibration isolation bush.

FIG. 7 is a plan view of a lower arm of the front suspension.

FIG. 8 is a cross-sectional view of a conventional vibration damping bush.

[Explanation of symbols]

10,40 ... Anti-vibration bush 12: Core member 14 ... Anti-vibration substrate 16 ... Intermediate tube 18 ... Stopper ring 20 ... Body of core member 22 ... End of core member 24: Mounting hole 26: Stopper flange 30 ... bolt 42 ... Outer cylinder 48: stopper rubber

Continued front page    F-term (reference) 3D001 AA18 BA01 CA01 DA08                 3J048 AA01 BA19 BD05 CB07 EA15                 3J059 AA04 BA42 BA54 BB01 BD05                       BD08 BD09 CB03 DA14 GA02

Claims (4)

[Claims] 1. A core member having mounting holes at both ends in the axial direction and a columnar body in the center, and a vibration-proof base body made of a rubber-like elastic body fixed to the outer periphery of the body. And is press-fitted into the mounting cylinder portion of the first member of the vehicle to be fixed to the first member, and is fixed to the second member of the vehicle with a bolt that passes through the mounting hole. In an anti-vibration bush that couples two members in an anti-vibration manner, a stopper flange that restricts displacement of the mounting cylinder portion to one axial side is integrally projected at one axial end of the body portion of the core member. An anti-vibration bush is provided, wherein a stopper ring for restricting displacement of the mounting cylinder portion to the other side in the axial direction is fixed to the other end in the axial direction by press fitting. 2. A vibration-isolating bush according to claim 1, wherein an intermediate cylinder that concentrically surrounds the core member is embedded in the vibration-isolating base. 3. An outer cylinder concentrically surrounding the core member, wherein the outer cylinder and the core member are coupled by the vibration-proof substrate interposed therebetween. Anti-vibration bush described. 4. A stopper rubber is provided on the inner surface side of the stopper ring in the axial direction thereof.
The vibration-proof bush according to any one of 3 to 3.