JP2002323079A - Anti-vibration bush and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent rubber burrs on a fastening surface of a flange provided at an end of an inner cylinder of an anti-vibration bush. SOLUTION: Body panel 1 and suspension member 2
A rubber elastic body 16 is fixed to the outer periphery of the inner cylinder 12 by vulcanization molding, and a fastening surface 18 to the vehicle body panel 1 is attached to an end of the inner cylinder 12. A non-fastening surface portion 28 is provided at a peripheral portion of the fastening surface via a step 26 so that the pressing surface portion 64 provided on the molding die 50 is not fastened during vulcanization molding of the rubber elastic body. Pressing against the surface portion 28 prevents the rubber from entering the fastening surface 18 inside the surface portion 28.

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 for automobiles and the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, for example, in a suspension mechanism of an automobile, a cylindrical vibration-isolating bush has been used as a vibration-isolating device for connecting a vehicle body and a suspension member in a vibration-isolating manner. It is used.

FIG. 6 shows such a conventional anti-vibration bush 100.
2 shows a cross-section of a vulcanized product during vulcanization molding. The anti-vibration bush 100 includes an inner cylinder 101 and an outer cylinder 10 which are arranged concentrically.
2 and a rubber elastic body 103 interposed therebetween. One end of the inner cylinder 101 has a fastening surface 10 to the vehicle body panel.
A flange 105 having four is provided. When vulcanizing the anti-vibration bush 100, one of the left and right dies 11
A mold 110 including the first and second molds 112 and an intermediate upper mold 113 and an intermediate lower mold 114 therebetween is used. On the other hand, the mold 111 is provided with a concave portion 115 for receiving the flange 105 of the inner cylinder 101, and vulcanization molding is performed with the peripheral wall of the flange 105 being surrounded by the side surface of the concave portion 115.

However, in this case, it is necessary to secure a certain gap between the side surface of the concave portion 115 and the peripheral wall of the flange 105 in consideration of the workability of closing the mold and the like. The rubber invades the fastening surface 104 after getting over, and the rubber burr 120
There is a problem that occurs.

FIG. 7 shows a vibration isolating bush 1 according to another conventional example.
It is sectional drawing at the time of vulcanization | molding molding of No. 30, In this example,
Rubber is also molded on the outer periphery of the flange 105. In this case, only the contact between the fastening surface 104 of the flange 105 and the wall surface of the concave portion 115 in the one-sided mold 111 causes
Since rubber is prevented from entering the fastening surface 104, rubber burrs 120 are likely to occur on the fastening surface 104.

[0006] The rubber burr 12 on such a fastening surface 104
In the case of No. 0, if it is assembled to a mating part as it is, the fastening is loosened due to the set of rubber, so it is necessary to remove it after vulcanization molding, which is a factor that increases the processing cost.

The present invention has been made in view of such a point, and an object of the present invention is to prevent rubber burrs on a fastening surface of a flange provided at an end of an inner cylinder.

[0008]

According to the present invention, there is provided an anti-vibration bush for connecting a first member and a second member in an anti-vibration manner, the outer periphery of an inner cylinder attached to the first member. A rubber elastic body is fixed by vulcanization molding, a flange having a fastening surface to the first member is provided at an end of the inner cylinder, and a non-fastening surface portion is provided at a peripheral portion of the fastening surface via a step portion. It is provided.

In the method of manufacturing a vibration-isolating bush according to the present invention, when the rubber elastic body is vulcanized, a pressing surface provided on a molding die is pressed against the non-fastening surface.
Rubber is prevented from entering the fastening surface inside.

[0010] With this vibration-isolating bush, since the non-fastening surface portion dropped through the step portion is provided on the peripheral portion of the fastening surface at the end of the inner cylinder, the vulcanization molding of the rubber elastic body is performed. This non-fastening surface portion can act as a sealing surface portion to block the intrusion of rubber that tries to intrude into the fastening surface over the flange from inside the cavity of the mold, and rubber burrs on the fastening surface can be prevented. . That is,
The pressing surface portion of the mold is pressed against the non-fastening surface portion to prevent the rubber from entering the fastening surface, but since the object to be pressed is the non-fastening surface, even if the pressing causes surface roughness, the first member and Does not affect the conclusion of Therefore, a sealing projection extending in the circumferential direction can be provided on the pressing surface of the molding die, and the projection can be pressed against the non-fastening surface, whereby the rubber can be more effectively prevented from entering the fastening surface.

The vibration isolating bush of the present invention includes an outer cylinder attached to the second member, the outer cylinder surrounding the inner cylinder in an axially parallel manner, and the rubber elastic body being formed on the inner periphery by vulcanization molding. The outer cylinder may be fixed, and the outer cylinder may be provided with a flange facing the flange of the inner cylinder, and a part of the rubber elastic body may be interposed between the two flanges.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of an anti-vibration bush 10 according to an embodiment of the present invention in a vehicle assembled state, FIG. 2 is a plan view of the anti-vibration bush 10, and FIG. It is sectional drawing.

An anti-vibration bush 10 connects the vehicle body panel 1 and the suspension member 2 in an anti-vibration manner, and includes a metal inner cylinder 12 concentrically arranged at a distance.
And an outer cylinder 14, and a rubber elastic body 16 interposed between the inner and outer cylinders 12, 14 by vulcanization molding and integrally connecting the two cylinders.

At one end of the inner cylinder 12 attached to the vehicle body panel 1, a fastening surface (that is, a coupling surface) to the vehicle body panel 1 is provided.
A flange 20 having an axially outer portion 18 is provided. The flange 20 is erected radially outward on the entire circumference of the inner cylinder 12. The inner cylinder 12 is provided with the mounting hole 3
And an insertion portion 22 to be inserted into the device. A nut 4 is welded to the mounting hole 3 of the vehicle body panel 1. With the bolt 5 inserted into the inner cylinder 12, the leading end insertion portion 22 is inserted into the mounting hole 3, and the fastening surface 18 of the flange 20 is Mounting hole 3
The inner cylinder 12 is attached and fixed to the vehicle body panel 1 by tightening the bolt 5 together with the nut 4 against the peripheral edge of the inner cylinder 12.

A flange 24 is provided at one end of the outer cylinder 14 attached to the suspension member 2 so as to face the flange 20 of the inner cylinder 12 in the axial direction. Outer cylinder 14
Is fixed by press-fitting the inside of the collar 6 of the suspension member 2 having a similar shape.

The rubber elastic body 16 is fixed to both the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the outer cylinder 14 by vulcanization bonding means. The rubber elastic body 16 is also interposed between the flange 20 of the inner cylinder 12 and the flange 24 of the outer cylinder 14, and the outer cylinder 14 with respect to the inner cylinder 12 is formed by the two flanges 20, 24 and the rubber 16a interposed therebetween. Is operated as a stopper for restricting the axial displacement. The rubber elastic body 16 is molded behind the flange 20 of the inner cylinder 12 by the stopper rubber 16a, and the outer periphery of the flange 20 is surrounded by the rubber elastic body 16.

As shown in FIGS. 1 and 2, the flange 20 of the inner cylinder 12 is provided with a non-fastening surface portion 28 which is dropped through a step 26 at the peripheral portion of the fastening surface 18 to the vehicle body panel 1. ing. The non-fastening surface portion 28 is a surface that surrounds the entire circumference of the fastening surface 18 perpendicular to the axial direction of the inner cylinder 12 over the entire circumference, is one step lower than the fastening surface 18, and is arranged in an annular shape parallel to the fastening surface 18. It is a surface part. Therefore, as shown in FIG. 1, the non-fastening surface portion 28 is in a non-contact state with the surface of the vehicle body panel 1 in a state where the inner cylinder 12 is fixed to the vehicle body panel 1, and is opposed to a small gap. Be placed.

The anti-vibration bush 10 is manufactured by setting an inner cylinder 12 and an outer cylinder 14 in a mold 50 and vulcanizing and molding a rubber elastic body 16 therebetween.

In the vulcanization molding, as shown in FIG.
One-sided mold 52 which can receive one end including the second flange 20
A second mold 54 for receiving the other end of the inner cylinder 12 and an upper and lower intermediate mold 5 for fixing the outer periphery of the outer cylinder 14 therebetween.
6 and 58 are used.

The one mold 52 has a flange 20 of the inner cylinder 12.
A concave portion 60 for receiving one end portion including the insertion portion 22 and the insertion portion 22 is provided.
The peripheral surface of a is molded. In the other mold 54, the rubber elastic body 1
6 is provided with a projection 62 for molding the end face.

A pressing surface 64 for pressing the non-fastening surface 28 of the flange 20 of the inner cylinder 12 is provided in the concave portion 60 of the mold 52. When the pressing surface 64 is closed,
It is provided so as to be pressed not on the fastening surface 18 but on the non-fastening surface portion 28 on the outer periphery thereof. Then, by pressing the pressing surface portion 64 against the non-fastening surface portion 28 in this manner,
The rubber is prevented from entering the inner fastening surface 18.

Specifically, as shown in FIG. 4, the height a of the pressing surface 64 is preferably set to be slightly larger than the step b between the fastening surface 18 and the non-fastening surface 28. The surface portion 64 can be effectively pressed against the non-fastening surface portion 28. Further, it is preferable to secure a certain gap g between the inner peripheral edge of the pressing surface portion 64 and the step portion 26.

According to the above-described embodiment, in the inner cylinder 12 having the flange 20 on which the stopper rubber 16a is molded on the surface opposite to the fastening surface 18, the peripheral portion of the inner cylinder 12 on the flange fastening surface 18 is formed. Is provided with a non-fastening surface portion 28 via a step portion 26, and the non-fastening surface portion 28 is used as a sealing surface portion when the rubber elastic body 16 is vulcanized and molded.
The pressing surface portion 64 of the mold 50 is pressed against the inner surface, so that the rubber can be prevented from entering the fastening surface 18 on the inner periphery thereof.
Further, since the sealing surface portion pressed by the mold 50 during the vulcanization molding is the non-fastening surface portion 28, even if the surface is roughened by pressing, the fastening surface 18 is not roughened. 1 can be sufficiently fastened.

FIG. 5 shows the pressing surface 6 in the above embodiment.
In this example, a sealing projection 7 having a substantially triangular cross section extending in the circumferential direction on the pressing surface portion 64 is shown.
The projection 70 is pressed against the non-fastened surface 28 to make it bite. In addition, the projection 7 for sealing is used.
The cross-sectional shape of 0 is not limited to a triangular shape, but a semi-circular shape,
It may be rectangular.

When the projection 70 is cut into the surface, the pressed surface has irregularities due to the depression. However, the non-fastened surface portion 28 does not affect the fastening to the vehicle body panel 1. By invading the sealing projections 70 in this manner, the intrusion of rubber into the fastening surface 18 can be more effectively blocked, and rubber burrs on the fastening surface 18 can be more effectively prevented.

In the above-described embodiment, the inner cylinder 12 having the flange 20 for fastening only at one end has been described. However, the present invention is not limited to the one end, and flanges are provided at both ends. A similar seal configuration may be employed. In the above embodiment, the case where the rubber elastic body 16 is fixed to both the inner cylinder 12 and the outer cylinder 14 by vulcanization molding has been described.
Is fixed only to the outer periphery of the inner cylinder 12 by vulcanization molding, and is similarly applicable to a vibration-proof bush of a type in which a rubber elastic body is pressed into a collar of a support member such as a suspension member and used. .

[0028]

According to the present invention, since the non-fastening surface portion dropped through the step portion is provided at the peripheral portion of the fastening surface at the end of the inner cylinder, the non-fastening portion is formed during vulcanization molding of the rubber elastic body. The fastening surface portion can function as a sealing surface portion that blocks rubber from entering the fastening surface, and rubber burrs on the fastening surface can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an anti-vibration bush according to an embodiment of the present invention in a vehicle assembled state.

FIG. 2 is a plan view of the vibration-isolating bush.

FIG. 3 is a cross-sectional view of the vibration-isolating bush during vulcanization molding.

FIG. 4 is an enlarged sectional view of a main part of FIG.

FIG. 5 is an enlarged sectional view of a main part at the time of vulcanization molding in another embodiment.

FIG. 6 is a cross-sectional view of a conventional vibration-isolating bush during vulcanization molding.

FIG. 7 is a cross-sectional view of another conventional vibration-isolating bush during vulcanization molding.

[Explanation of symbols]

 10 Vibration-proof bushing 12 Inner cylinder 14 Outer cylinder 16 Rubber elastic body 18 Fastening surface 20 Flange 26 Stepped portion 28 Non-fastened surface portion 50 Mold 64 Pressing surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J048 AA01 BA19 EA15 3J059 AA04 AD05 BA42 BC06 BD01 CB03 CB16 DA15 EA03 EA06 GA02

Claims (4)

[Claims] 1. A bush for dampingly connecting a first member and a second member, wherein a rubber elastic body is fixed to an outer periphery of an inner cylinder attached to the first member by vulcanization molding, An anti-vibration bush, wherein a flange having a fastening surface to the first member is provided at an end of the inner cylinder, and a non-fastening surface portion is provided at a peripheral portion of the fastening surface via a step. 2. An outer cylinder attached to the second member, the outer cylinder surrounding the inner cylinder in an axially parallel manner, and the rubber elastic body is fixed to an inner periphery of the outer cylinder by vulcanization molding. The vibration isolating bush according to claim 1, wherein a flange is provided on the cylinder, the flange being opposed to the flange of the inner cylinder, and a part of the rubber elastic body is interposed between the two flanges. 3. The method for manufacturing a vibration-isolating bush according to claim 1, wherein when the rubber elastic body is vulcanized, a pressing surface provided on a molding die is pressed against the non-fastening surface. The method of manufacturing a vibration-isolating bush, wherein rubber is prevented from entering the fastening surface on the inside thereof. 4. The method of manufacturing a vibration-proof bush according to claim 3, wherein a sealing projection extending in a circumferential direction is provided on the pressing surface portion, and the projection is pressed against the non-fastening surface portion.