JP2001295886A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stopper abutting surface larger than a stopper rubber part integrated with a rubber elastic body at the end part on the tip side of a press-in direction, and to easily force a vibration control device without producing a bite. SOLUTION: This vibration control device is mounted by joining an inner cylinder bracket 1 to an outer cylinder bracket 2 by an elastic body 3 between them, and forcing the outer cylinder bracket 2 in the mounting hole 31 of one supporting member 30. A stopper rubber part 7 axially protruding from the end part of the outer cylinder bracket 2 is provided continuously from the rubber elastic body 3 at the end part on the tip side of the press-in direction to the mounting hole 31, and the outer rim part 7a of the stopper rubber part 7 is extended in a diameter direction from the press-in surface 2a of the outer periphery of the outer cylinder bracket. Thereby, a configuration deformable so as not to produce a bite of the outer rim part 7a when the outer cylinder bracket is forced in the mounting hole 31 can be obtained for the vibration control device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator mainly used as an engine mount or a suspension bush of an automobile.

[0002]

2. Description of the Related Art Conventionally, as an anti-vibration device used as an anti-vibration bush for an engine mount of an automobile or a suspension, an inner cylindrical fitting and an outer cylindrical fitting are interposed between the two fittings. It is known that they are connected by a rubber elastic body. Usually, the outer cylindrical fitting is press-fitted into a mounting hole in a support member such as a bracket provided on one of a vibration source side such as an engine and a support side such as a vehicle body, and the inner cylindrical fitting is inserted into the fitting hole. It is used by being attached to the other substantially U-shaped support member via the shaft member to be used.

In the vibration isolator having such a configuration, for example, when the device is used with the axial direction being the vehicle front-rear direction, in order to restrict the relative displacement of a certain value or more in the axial direction and to prevent interference between metals, A pair of rubber stoppers that contact the support member are provided at both ends in the axial direction.

Conventionally, as the stopper, as shown in FIG. 7, an inner cylindrical fitting (5) is provided via a rubber elastic body (53).
The stoppers (60) and (61) separate from the vibration isolator main body in which 1) and the outer tube fitting (52) are connected to each other are assembled. In this case, the stoppers (60) and (61) need to be separately vulcanized and formed, and when assembling to the vibration isolator main body, it is necessary to apply an adhesive. The cost was high.

In order to solve the above problems,
As shown in FIG. 8, as the stoppers (60) and (61),
It is also known that a rubber portion formed integrally with a rubber elastic body (53) between the inner cylinder (51) and the outer cylinder (52) is formed so as to protrude from the outer cylinder (52).

However, since the outer cylindrical fitting (52) is press-fitted into the mounting hole (31) of the one support member (30), the rear end of the press-fitting direction is shown in FIG. Thus, a stopper (60) extending radially along the outer surface of the flange (59) of the outer tube fitting (52) is provided,
Although a relatively large stopper contact surface (60a) can be set, at the end on the tip side in the press-fitting direction,
If a large stopper extending outward from the outer surface of the outer cylinder fitting (52) is provided, the protruding rubber portion is caught in the press-fitting portion on the outer periphery of the outer cylinder fitting, and is damaged or difficult to press-fit. There are problems such as.

For this reason, the stopper (6
Regarding 1), as shown in the figure, the stopper contact surface (61a) cannot be set large. Therefore, there is a problem that sufficient durability cannot be ensured against the repetition of the stopper action.

The present invention has been made in view of the above, and at the end on the distal end side in the press-fitting direction, a larger stopper contact surface can be set on a stopper rubber portion integral with a rubber elastic body. The press-fitting can be easily performed without causing such press-fitting at the press-fitting portion.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises an inner cylinder and an outer cylinder which is arranged to surround the outer cylinder. A vibration isolator, which is connected by a rubber elastic body interposed between metal fittings, wherein the outer cylindrical metal fitting is press-fitted into a mounting hole provided in one of the support members, and is press-fitted into the mounting hole. A stopper rubber portion is provided at an end on the front end side in the direction, which protrudes in an axial direction from an end of the outer cylinder fitting continuously from the rubber elastic body, and an outer edge of the stopper rubber portion is press-fitted around the outer cylinder fitting. It is characterized by being provided so as to extend in the radial direction from the surface and to be deformable so that the outer edge portion does not bite when pressed into the mounting hole.

According to this vibration isolator, when the outer cylinder is press-fitted into the mounting hole of one of the support members, the outer edge of the stopper rubber portion extending radially at the end on the front end side in the press-fitting direction. Since the portion is deformed in the diameter reducing direction at the same time as the press-fitting into the mounting hole, the press-fitting can be performed without causing biting. Moreover, as described above, the outer edge of the stopper rubber portion extends radially outward from the press-fit surface on the outer periphery of the outer cylinder, so that the stopper contact surface can be set to be large. Durability also improves.

In the above-mentioned vibration damping device, it is preferable that an end portion of the outer edge portion of the stopper rubber portion on the side of the stopper contact surface is chamfered. That is, when press-fitting into the mounting hole as described above, the chamfered portion acts as a guide for the mounting hole, and an inward pressing force acts on the outer edge portion with the press-fitting. This outer edge portion is easily deformed in the diameter reducing direction, so that the press-fitting can be easily performed without the possibility of biting.

The end of the outer cylinder is slightly reduced in diameter, and the stopper rubber portion is bent from the end of the outer cylinder and extends in the radial direction. It is particularly preferable that a small concave portion smaller in diameter than the press-fitting surface is formed on the outer periphery of the end portion.

According to this, when the outer edge is pushed down in a direction opposite to the press-fitting direction when the press-fitting into the mounting hole is performed, the outer peripheral portion is recessed from the press-fitting surface by the concave portion on the outer periphery of the end. As a result, it is held so as not to protrude to the other side, so that the press-fitting can be carried out without further encroachment.

It is preferable that the outer edge of the stopper rubber portion be extended radially outward by 1 mm or more from the press-fitting surface on the outer periphery of the outer cylinder, so that the stopper contact surface can be set large.

At the end on the rear end side in the press-fitting direction, a flange protruding in the radial direction is provided at the end of the outer cylindrical fitting, and the flange outer surface continuously protrudes in the axial direction from the rubber elastic body. It is preferable that a stopper rubber portion projecting in the radial direction is provided so as to face the stopper rubber portion on the distal end side, so that the contact surfaces of the stoppers at both ends can be set large.

Each of the stopper rubber portions may be provided at a position below the vehicle in the vertical direction.

[0017]

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 shows a vibration isolator (A) according to one embodiment of the present invention.
3 is a cross-sectional view taken along line XX of FIG. 3, FIG. 2 is an enlarged cross-sectional view of a part of the above, FIG.
FIG. 4 is a front view from the front end side in the press-fitting direction, and FIG.
FIG. 6 is a cross-sectional view taken along line Y, and FIG.

The anti-vibration device (A) of this embodiment has a relatively thick cylindrical inner cylinder (1) and an outer cylinder (2) arranged so as to surround the outside thereof. And are integrally connected by a rubber elastic body (3) as a vibration isolating base which is interposed between the two metal fittings and fixed by vulcanization bonding means. Usually, the outer cylinder (2) has substantially the same axial dimension as one of the support members (30) having the mounting holes (31), and the inner cylinder (1) has the outer cylinder (2) and the outer cylinder (2). It is slightly longer than the rubber elastic body (3).

In the case of the embodiment shown in the figure, the outer cylinder fitting (2) has a substantially elliptical shape which is long in the horizontal direction (the horizontal direction on the paper) in the used state in the front view of FIG. A metal fitting (1) is disposed eccentrically upward with respect to the outer cylindrical metal fitting (2), and is connected by the rubber elastic body (3). The rubber elastic body (3) is provided with cavities (4) and (5), respectively, above and below when the inner cylindrical fitting (1) is in use, and the inner cylindrical fitting (1) is connected to the rubber elastic body (3). It is provided so as to be supported on both side portions of. The lower cavity (5) is provided with a projection (6) projecting from the outer cylinder (2) side to the upper inner cylinder (1) side, and a stopper against large vertical displacement. It is provided to perform the function.

At the end on the tip side in the press-fitting direction with respect to the mounting hole (31) of the one support member (30), the outer cylindrical metal fitting (2) is continuously connected to the rubber elastic body (3).
A stopper rubber portion (7) protruding in the axial direction from an end of the outer rubber member (7) is provided. It is extended in the direction. The outer edge portion (7a) is formed so as to be deformable so as not to be caught when pressed into the mounting hole (31).

The outer edge portion (7) of the stopper rubber portion (7)
a) is deformed so that biting does not occur during the press-fitting, so that the stopper contact surface (7) of the outer edge portion (7a) is formed.
The end on the b) side is preferably chamfered. That is, when press-fitting into the mounting hole (31), the chamfered portion (7c) acts as a guide to the mounting hole (31), and the inner edge (7a) is pressed into the outer edge portion (7a) with the press-fitting. When the pressing force acts in the direction, the outer edge (7a)
Are easily deformed in the diameter reducing direction.

Further, the end of the outer cylinder fitting (2) is bent by using a drawing process in manufacturing the outer cylinder fitting so as to be bent in a tapered shape so as to bend slightly inward, thereby reducing the diameter. The outer edge (7a) of the stopper rubber portion (7) is bent from the end position of the outer cylinder fitting (2) on the round surface and extended in the radial direction, thereby extending the end of the outer cylinder fitting (2). A slightly concave portion (21) smaller in diameter than the press-fit surface (2a)
When the outer edge (7a) is pushed down in a direction opposite to the press-fitting direction during press-fitting into the mounting hole (31), the end of the outer cylinder fitting (2) is formed. Due to the concave portion (21) on the outer periphery, it is easily held so as not to protrude outward from the press-fitting surface (2a), and press-fitting can be performed without biting. Particularly, the combination of the concave portion (21) and the chamfered portion (7c) enhances the effect of preventing the bite.

The outer edge portion (7) of the stopper rubber portion (7)
In order to set the stopper contact surface (7b) to be larger than before, a) is a press-fit surface (2a) on the outer periphery of the outer cylinder fitting (2).
It is better to extend radially outward by 1 mm or more, but if the extension is too large, the mounting hole (3
The outer edge (7a) may be in close contact with the inner peripheral surface of the mounting hole (31) when it is press-fitted in 1), and it may be difficult to come out to the outside. .

That is, the mounting hole (31) in the support member (30) is provided for facilitating the press-fitting operation.
Normally, the inner peripheral surfaces at both ends in the axial direction are chamfered to increase the diameter. When the outer cylinder fitting (2) is pressed into the mounting hole (31) to a predetermined position, the stopper rubber portion is formed. The outer edge (7a) of (7) is attached to the mounting hole (31).
The dimensions of the chamfered portion (31a) are such that the chamfered portion (31a) can be easily detached from the inner peripheral surface and pulled out of the mounting hole (31). Further, the thickness of the outer edge portion (7a) in the axial direction is also set so as to enable the above-described extraction.

Further, a flange (9) for positioning to be in contact with an end face of the support member (30) is provided at an end on the rear end side in the press-fitting direction of the outer cylinder fitting (2), and the rubber is provided. The stopper rubber portion (8), which is integrally formed continuously with the elastic body (3), protrudes in the axial direction, and extends and joins in the radial direction along the axially outer surface of the flange (9). Is the stopper rubber part on the tip side (7)
Are provided opposite to each other.

In particular, in the case of the drawing, a flange extension extending further outward than the flange (9) is provided in a lower portion of the vehicle in the vertical direction (the short axis direction of the substantially elliptical shape) in use. A portion (9a) is provided, and an outer edge portion of the stopper rubber portion (8) is additionally provided so as to correspond to the outer surface of the extension portion (9a). (8a) is the stopper rubber portion (8)
Of the stopper, so that the stopper contact surface (8a)
Is set large.

The stopper rubber portions (7) at both ends are provided.
(8) is formed so as to have a substantially trapezoidal shape corresponding to the shape of the convex portion (6) of the inner rubber elastic body (3) at the lower portion in the vehicle vertical direction, and Although it is formed to hold the surfaces (7b) and (8b), it is not limited to this, and it is also possible to provide it on other parts or on the entire circumference according to the use form.

According to the vibration isolator (A) of this embodiment, the mounting hole (31) of one of the support members (30) on the side of the vibration source such as the engine or the wheel and the side of the support such as the vehicle body. The shaft member (4) fixed by press-fitting the outer tube fitting (2) and being held by the other support member (40) such as a substantially U-shaped bracket.
The inner cylinder fitting (1) is fitted and attached to 1) and used as an engine mount or a suspension bush.

Thus, when press-fitting the outer cylinder fitting (2) into the mounting hole (31), the outer edge portion (7a) of the stopper rubber portion (7) extending radially at the end on the tip side in the press-fitting direction.
Is a chamfer (31a) at the end of the mounting hole (31).
And it is pushed inward and deformed.

In particular, an inward pressing force is exerted by the chamfered portion (7c) of the outer edge portion (7a) on the side of the stopper contact surface (7b), and a slight outer periphery of the outer periphery of the end of the outer cylinder fitting (2). Despite the fact that the outer edge (7a) extends radially outward, the concave portion (21) can absorb and hold the portion that has been deformed so as to be pushed down in the direction opposite to the press-fitting direction. And can be easily contracted and deformed, and press-fitted without causing biting. In a state where the stopper rubber portion (7) is completely press-fitted to a predetermined position, the outer edge portion (7a) of the stopper rubber portion (7) separates from the mounting hole (31) of the support member (30) as shown in FIG. It is held in a state of protruding outside.

Further, as described above, the outer edge portion (7a) of the stopper rubber portion (7) on the distal end side in the press-fit direction extends radially outward from the press-fit surface on the outer periphery of the outer cylinder fitting (2). The stopper contact surface (7a) can be set large, and the durability against the repetition of the stopper action is improved accordingly.

In the above embodiment, the case where the outer cylinder (2) is substantially elliptical in front and the inner cylinder (1) is eccentrically arranged with respect to the outer cylinder (2) is shown. The outer tube fitting may be cylindrical, or the inner and outer tube fittings may be arranged concentrically.

[0034]

As described above, according to the vibration isolator of the present invention, the outer edge of the stopper rubber portion integral with the rubber elastic body is provided at the end on the distal end side in the press-fitting direction. Even if it is more radially extended, it can be easily press-fitted without causing biting. In addition, since the stopper contact surface can be set larger than in the related art, the durability against repetition of the stopper action is also improved.

[Brief description of the drawings]

FIG. 1 shows a vibration isolator according to one embodiment of the present invention.
It is sectional drawing of an X-ray.

FIG. 2 is an enlarged sectional view of a part of the above.

FIG. 3 is a front view from the rear end side in the press-fitting direction in the same.

FIG. 4 is a front view detail from the front end side in the press-fitting direction.

FIG. 5 is a sectional view taken along line YY of FIG. 3;

FIG. 6 is a cross-sectional view of the vibration isolator in the attached state.

FIG. 7 is a cross-sectional view illustrating an example of a conventional vibration damping device.

FIG. 8 is a cross-sectional view showing another example of the conventional vibration damping device.

[Explanation of symbols]

 (A) Anti-vibration device (1) Inner tube fitting (2) Outer tube fitting (2a) Press-fit surface (21) Recess (3) Rubber elastic body (4) (5) Cavity (6) Convex (7) Press-fit (7a) Outer edge (7b) Stopper contact surface (7c) Chamfered part (8) Stopper rubber part on the rear end side in the press-fitting direction (9) Flange (9a) Flange extension (30) One support member (31) Mounting hole (40) The other support member (41) Shaft member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D035 CA06 3J048 AA01 BA19 CB07 EA01 EA15 3J059 AA04 BA42 BA74 BD07 DA13 DA16 GA04 GA09

Claims (6)

[Claims] 1. An inner cylindrical member and an outer cylindrical member disposed so as to surround the outer part thereof are connected by a rubber elastic body interposed between the inner and outer metal members. A vibration isolator which is press-fitted into a mounting hole of the supporting member and is attached to the mounting hole at a front end in a press-fitting direction into the mounting hole. A stopper rubber portion that protrudes more in the axial direction is provided, and an outer edge portion of the stopper rubber portion extends in a radial direction from a press-fitting surface on an outer periphery of the outer cylindrical fitting, and the outer edge portion is press-fitted into the mounting hole. An anti-vibration device characterized by being provided so as to be deformable so as not to be caught. 2. An anti-vibration device according to claim 1, wherein an end of said outer peripheral portion of said stopper rubber portion on a surface in contact with said stopper is chamfered. 3. The outer cylindrical metal fitting has an end portion slightly reduced in diameter, and the stopper rubber portion is bent from an end position of the outer cylindrical metal member and extends radially. The vibration isolator according to claim 1, wherein a slight concave portion having a diameter smaller than that of the press-fitting surface is formed on an outer periphery of the end portion. 4. An anti-vibration device according to claim 1, wherein an outer edge portion of said stopper rubber portion extends radially outward by 1 mm or more from a press-fitting surface on an outer periphery of the outer cylinder. . 5. A flange which projects radially at an end of the outer cylindrical fitting at an end on the rear end side in the press-fitting direction, and which projects axially continuously from the rubber elastic body. The anti-vibration device according to any one of claims 1 to 4, wherein a stopper rubber portion extending radially outward along the outer side surface is provided to face the stopper rubber portion on the distal end side. 6. An anti-vibration device according to claim 1, wherein each of said stopper rubber portions is provided at a position below the vehicle in the vertical direction.