JP3004584B2 - Elastic stopper for anti-vibration device - Google Patents

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 such as an engine mount used for an automobile, which is mounted in advance, and is interposed between a bracket and an outer cylinder of the anti-vibration bush so that they do not directly contact each other. Related to elastic stoppers.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view showing a vibration isolator applied to a conventional automobile engine mount. This vibration isolator includes a cylindrical bracket 6 connected to the engine side.
A U-shaped bracket 7 fixed to the vehicle body 9, a vibration-proof bush 1 interposed between the cylindrical bracket 6 and the U-shaped bracket 7, a U-shaped bracket 7 and the vibration-proof bush 1, And elastic stoppers 10 and 10 interposed therebetween.

[0003] The vibration-isolating bush 1 is constructed by interposing a rubber elastic body 4 between an inner cylinder 2 and an outer cylinder 3 made of metal. Then, while the outer cylinder 3 is fitted inside the cylindrical bracket 6, the inner cylinder 2 is
Are fixed to the U-shaped bracket 7 via bolts 8 and the rubber elastic body 4 suppresses transmission of vibration to the power unit.

A through hole 12 is formed through each of the elastic stoppers 10, and the inner cylinder 2 is inserted through the through holes 12 so that the elastic stoppers 10, 10 are previously formed at both ends 2 of the inner cylinder 2.
a, 2a. The elastic stopper 10 is interposed between the U-shaped bracket 7 and the outer cylinder 3,
As a result, the rubber elastic body 4 is excessively deformed due to rapid acceleration or deceleration of the automobile or vertical vibration, and the vibration-proof bush 1 is excessively inclined, or the end of the outer cylinder 3 directly contacts the U-shaped bracket 7. To prevent that.

In this case, the elastic stopper 10 inserted into the inner cylinder 2 moves relative to the inner cylinder 2 during the transportation of the vibration-isolating bush 1 and falls off from the end 2a of the inner cylinder 2. Sometimes. Therefore, in the one disclosed in Japanese Utility Model Publication No. 5-9552, as shown in FIG.
The two elastic stoppers 10, 10 are connected by a string-shaped connecting member 14 having elasticity. When attaching the elastic stoppers 10, 10, first insert one elastic stopper 10 into one end 2 a of the inner cylinder 2, and then insert the other elastic stopper 10.
Is pulled against the tensile force of the connecting member 14 and inserted from the other end 2a. As a result, the connecting member 14 is appropriately pulled, so that the elastic stoppers 10, 10 are prevented from falling off.

[0006]

However, the structure disclosed in the above publication is complicated because the two elastic stoppers 10, 10 are connected. In addition, when attaching, connecting member 1
4 is an obstacle, and in particular, the elastic stopper 10 on the other side is subjected to a tensile force or the like via the connecting member 14, so that the mounting operation is complicated.

On the other hand, it is conceivable to fix the elastic stopper to the inner cylinder with an adhesive or the like. However, in this case, workability is deteriorated, and the cost is increased due to the use of the adhesive. .

The present invention has been made in view of the above-mentioned problems of the prior art, and can effectively prevent the vibration-isolating bush from falling off from the inner cylinder with a simple structure, and can easily insert and attach to the inner cylinder. An object of the present invention is to provide an elastic stopper for a vibration isolator having good characteristics.

[0009]

In order to solve the above-mentioned problems, an elastic stopper of a vibration isolator according to the present invention has a rubber elastic body disposed between an inner cylinder and an outer cylinder disposed on the outer periphery of the inner cylinder. The anti-vibration bush that is interposed and the end of the inner cylinder are
A bracket which is Attach, formed through a predetermined position
The bracket is previously attached to the inner cylinder through an insertion hole,
A vibration damping device having an elastic stopper, which is interposed between the socket and the outer cylinder, the inner peripheral surface of the insertion hole, the
Protruding toward the center of the insertion hole, when inserting the inner cylinder,
An elastic projection is provided along the outer peripheral surface of the inner cylinder so as to bend in the bracket direction.

The elastic projection according to the present invention projects inward from the inner peripheral surface of the insertion hole, and is bent and deformed so as to fall down in the insertion direction of the inner cylinder when the inner cylinder is inserted. Close contact with the outer peripheral surface of the cylinder. Therefore, when a force in the pull-out direction acts on the elastic stopper, the elastic protrusion goes back inward and the reaction force increases, effectively preventing the elastic stopper from moving relative to the inner cylinder in the pull-out direction. It is possible to effectively prevent the elastic stopper from falling off during the transportation and distribution process of the vibration isolating bush.

The elastic projection may be provided at any position in the axial direction of the insertion hole. However, claim 2
When the elastic projection is provided on the bracket-side edge of the insertion hole as in the invention described in the above paragraph, the elastic projection falls down outward from the insertion hole when the inner cylinder is inserted. It does not fold over the inner peripheral surface of the inner cylinder, and is superior in the insertability of the inner cylinder.

According to the third aspect of the present invention, the elastic projection portion is formed to extend annularly along the circumferential direction of the insertion hole. In this case, the elastic projections are almost uniformly and strongly adhered over the entire circumference of the inner cylinder, and the elastic stopper is more reliably prevented from falling off the inner cylinder.

Further, in the invention according to claim 4, in order to prevent a crack or breakage due to bending deformation of the elastic projection, a slit extending in a radial direction is formed in the elastic projection.

On the other hand, in the invention according to claim 5, a plurality of elastic projections are provided intermittently along the circumferential direction of the insertion hole, so that the elastic projections are less likely to crack or break.

The elastic stopper according to the present invention is attached to the vibration isolating bush in advance by inserting the inner cylinder through the insertion hole. For example, the elastic stopper is provided at both ends of the inner cylinder of the vibration isolating bush. The elastic stopper may have a circular shape, a rectangular shape, or another shape obtained by combining them.
For example, when the outer cylinder is circular and the bracket faces the entire surface of the outer cylinder, a circular thin plate-like elastic stopper larger than the outer cylinder is desirably used.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a sectional view of a vibration isolator according to a first embodiment in which the present invention is applied to an engine mount. In addition,
The same components as those in the related art will be described with the same reference numerals.

This vibration damping device is interposed between the cylindrical bracket 6 connected to the engine side, the U-shaped bracket 7 fixed to the vehicle body 9, and the cylindrical bracket 6 and the U-shaped bracket 7. A vibration isolating bush 1 as an engine mount, and elastic stoppers 20, 20 interposed between the U-shaped bracket 7 and the vibration isolating bush 1.

The anti-vibration bush 1 is constructed by fixing a rubber elastic body 4 between an inner cylinder 2 and an outer cylinder 3 made of metal. The outer cylinder 3 is arranged coaxially with the inner cylinder 2, and a cylindrical bracket 6 is fitted around the outer cylinder 3. The outer cylinder 3 has a shorter axial length than the inner cylinder 2.

The inner cylinder 2 projects axially from both ends of the outer cylinder 3 at both ends 2a. The inner cylinder 2 is disposed between the two plate portions 7a of the U-shaped bracket 7 having a substantially U-shape, and the bolt 8 is passed through the holes 7b of the both plate portions 7a and the inner cylinder 2 and fastened by the nut 8a. As a result, both ends 2a, 2a are firmly fixed to the U-shaped bracket 7.

The elastic stoppers 20, 20 are interposed between the plate portion 7a of the U-shaped bracket 7 and the distal end of the outer cylinder 3, respectively, so that when the rubber elastic body 4 is excessively deformed, the vibration isolating bush 1 itself is formed. It has a function of preventing an excessive inclination or an end of the outer cylinder 3 from directly contacting the U-shaped bracket 7.

Here, for the sake of simplicity, the structure of the elastic stopper 20 on the right side in the figure will be mainly described.

The elastic stopper 20 has a circular thin plate shape,
An insertion hole 22 through which the end 2a of the inner cylinder 2 is inserted is formed in the center thereof in advance while being attached to the end 2a of the inner cylinder 2 in advance.

On one side of the insertion hole 22, that is, on the edge of the U-shaped bracket 7 when attached to the vehicle body, an elastic projection 24 is integrally formed to protrude along the circumferential direction. In a state before the elastic stopper 20 is inserted into the vibration isolating bush 1, as shown in FIG. 2, the elastic projection 24 has a thin annular shape with a rectangular cross section, and the insertion hole 22 extends from the inner peripheral surface of the insertion hole 22. Projecting radially toward the center of the lens . The inner diameter of the insertion hole 22 is substantially equal to or slightly shorter than the outer diameter of the inner cylinder 2 so that the inner cylinder 2 can be inserted while sliding appropriately. The bracket side surface, that is, the outer side surface 24a (the right side surface in the figure) of the elastic projection portion 24 is formed substantially flush with the bracket side surface, that is, the outer surface 20a of the elastic stopper 20 main body.

The operation of inserting the elastic stopper 20 will be described.
4a, the elastic projection 24 is pressed by the tip of the inner cylinder 2 and bent and deformed toward the traveling direction of the inner cylinder 2 (the direction indicated by the arrow in the figure). Fall down.

When the elastic stopper 20 is attached to the inner cylinder 2, as shown in FIG. 3, the inner cylinder 2 is completely inserted through the insertion hole 22, and the elastic projection 24 is attached to the outer peripheral surface of the inner cylinder 2. The inner tube 2 is bent and deformed along the bracket, and projects toward the tip of the inner cylinder 2. Then, the entire inner side surface 24b of the elastic projection portion 24 comes into close contact with the outer peripheral surface of the inner cylinder 2 and makes strong elastic contact.
In the figure, the shape is simplified for easy understanding.

With such a configuration, the elastic stopper 20
When the elastic member 24 attempts to move relatively toward the distal end of the inner cylinder 2, the elastic protrusion 24 is held in a state of securely engaging with the outer peripheral surface of the inner cylinder 2 in an attempt to go back inside. The relative movement of the elastic stopper 20 is effectively prevented. Therefore, the elastic stopper 20 does not easily fall off the inner cylinder 2 during the transportation and distribution process of the vibration isolating bush 1.

Further, by merely inserting the elastic stopper 20 into the inner cylinder 2, the elastic stopper 20 is mounted without falling off from the inner cylinder 2, and workability is remarkably improved.

FIGS. 4 to 7 show second to fifth embodiments of the present invention. In the following embodiments, other configurations not shown are almost the same as those of the first embodiment, and the description thereof will not be repeated.

The elastic projection 3 according to the second embodiment shown in FIG.
Numeral 0 protrudes inward of the insertion hole 22 while being inclined outward from the insertion hole 22, that is, toward the bracket in the assembled state. For this reason, the elastic projections 30 are more likely to fall down, and the insertability of the inner cylinder 2 is further improved.

In the third embodiment shown in FIG. 5, a thin portion 32 is formed along the inner peripheral surface of the insertion hole 22 at the base end of the elastic projection 24. In this case also, the elastic projection 24 falls down. Easy and excellent in insertability.

In the fourth embodiment shown in FIG.
4 is slightly offset from the insertion hole 22 to the bracket side (the right side in the figure). That is, a tapered surface that gradually increases in thickness toward the insertion hole 22 is formed on the outer surface 20 a of the elastic stopper 20, and the outer surface 34 of the elastic protrusion 34 is formed.
a is continuous with the outer side surface 20 a of the elastic stopper 20.

In the fifth embodiment, as shown in FIG. 7, a groove 36 is formed along the circumferential direction on the outer side surface 20a near the elastic projection 24 so that the elastic projection 24 faces the bracket when the inner cylinder is inserted. It can fall down well.

It is apparent that the same effects as those of the first embodiment can be obtained in the second to fifth embodiments.

FIGS. 8 and 9 show sixth and seventh embodiments of the present invention. When the inner cylinder is inserted, the elastic projection portion 24 is greatly expanded and deformed particularly near the distal end.
A slit 38 extending in the radial direction is formed in the elastic projection 24 of the embodiment, so that the elastic projection 24 is less likely to be cracked or damaged due to the above-mentioned extension deformation.

In the seventh embodiment, as shown in FIG.
A plurality of elastic projections 40 are formed intermittently at equal intervals along the circumferential direction, and a gap 42 is formed between adjacent elastic projections 40. In such a case, similarly to the sixth embodiment, cracks and breaks are less likely to occur in the elastic projection 24.

The shape of the elastic stopper may be other than a circular shape as shown in the first embodiment. For example, as shown in FIG. The insertion hole 22 may be formed on the side. In this embodiment, an elastic projection 24 is formed to project from the insertion hole 22 as in the first embodiment, and a thick portion 44 a is formed on the circumferential side of the elastic stopper 44. Although not shown here, the thick portion 44a is interposed between the bracket attached to the vehicle body or the like and the outer cylinder of the vibration isolating bush.

[0038]

As described above, in the elastic stopper of the vibration isolator according to the present invention, the elastic projection which bends and deforms toward the bracket when the inner cylinder is inserted is provided on the inner peripheral surface of the penetrating insertion hole. In addition, it is possible to effectively prevent the elastic stopper from falling off the vibration isolating bush. Further, the elastic stopper is attached to the vibration isolating bush without falling off from the inner cylinder only by inserting the inner cylinder into the insertion hole of the elastic stopper, and the workability thereof is extremely good.

According to the second aspect of the present invention, when the elastic projection is provided on the bracket-side edge of the insertion hole,
When the inner cylinder is inserted, the elastic projection falls down outward from the insertion hole, so that the elastic projection does not fold on the inner peripheral surface of the insertion hole, and the insertability of the inner cylinder is further improved.

When the elastic protrusion extends annularly along the circumferential direction of the insertion hole as in the invention according to the third aspect, the elastic protrusion adheres substantially uniformly and strongly over the entire circumference of the inner cylinder. Thus, the elastic stopper is more reliably prevented from dropping from the inner cylinder.

According to a fourth aspect of the present invention, when the elastic projection has a slit extending in the radial direction,
Cracks and breakage due to bending deformation of the elastic projections are less likely to occur.

Further, when a plurality of elastic projections are provided intermittently along the circumferential direction of the insertion hole as in the invention according to the fifth aspect, cracks or breakage are less likely to occur in the elastic projections.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration isolator according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an anti-vibration bush and an elastic stopper before assembling the elastic stopper.

FIG. 3 is a sectional view showing a vibration-isolating bush to which an elastic stopper is attached.

FIG. 4 is a partial sectional view of a vibration isolator according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a vibration isolator according to a third embodiment of the present invention.

FIG. 6 is a partial sectional view of a vibration isolator according to a fourth embodiment of the present invention.

FIG. 7 is a partial sectional view of a vibration isolator according to a fifth embodiment of the present invention.

FIG. 8 is a partial front view of an elastic stopper according to a sixth embodiment of the present invention.

FIG. 9 is a partial front view of an elastic stopper according to a seventh embodiment of the present invention.

FIG. 10 is a diagram showing another example of the elastic stopper.

FIG. 11 is a cross-sectional view of the vicinity of an engine mount of an automobile.

FIG. 12 is a front view of a conventional elastic stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Anti-vibration bush 2 ... Inner cylinder 2a ... End part 3 ... Outer cylinder 4 ... Rubber elastic body 7 ... U-shaped bracket 20 ... Elastic stopper 20a ... Outer surface 22 ... Insertion hole 24 ... Elastic protrusion 24a ... Outer surface

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 1/38 B60K 5/12 F16F 15/08

Claims (5)

(57) [Claims] An anti-vibration bush comprising a rubber elastic body interposed between an inner cylinder and an outer cylinder disposed on the outer periphery of the inner cylinder; and a bracket to which an end of the inner cylinder is attached. ,
The inner cylinder is preliminarily inserted through a through hole formed at a predetermined position.
Mounted between the bracket and the outer cylinder.
A vibration damping device having an elastic stopper which Zaisa, the inner peripheral surface of the insertion hole, collision towards the center of the insertion hole
Out, upon insertion of the inner cylinder, the elastic stopper of the anti-vibration device, characterized in that resilient projections for deforming bending are provided on the bracket along the outer peripheral surface of the inner cylinder. 2. The elastic stopper according to claim 1, wherein the elastic projection is provided at an edge of the insertion hole on the bracket side. 3. The elastic stopper according to claim 1, wherein the elastic protrusion extends annularly along a circumferential direction of the insertion hole. 4. The elastic stopper according to claim 3, wherein a slit extending in a radial direction is formed in the elastic protrusion. 5. The elastic stopper according to claim 1, wherein a plurality of the elastic projections are provided intermittently along a circumferential direction of the insertion hole.