JP2005009626A - Vibration isolator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably maintain a specified vibration isolation performance over a long period by minimizing the entry of solid foreign matter such as gravel into a first mounting member by simply improving a stopper rubber. <P>SOLUTION: This vibration isolator is formed such that a vibration isolating base body 3 is interposed between the first mounting member 1 and a second mounting member 2 disposed on the axis thereof and the stopper rubber 6 is installed on the inner peripheral surface of the first mounting member 1 oppositely to the outer peripheral surface of a stopper flange 6 formed projectedly from the second mounting member 2 in a direction perpendicular to a shaft. Annular rubber membranes 6B1 and 6B2 are integrally formed on the stopper rubber 6 extendedly inward from the rubber portion 6A of the first mounting member 1 covering an inward bent flange part 14, and the inner peripheral end edges of the annular rubber membranes 6B1 and 6B2 are brought into elastic contact with the outer peripheral surface of the second mounting member 2 to form a two-stage seal structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator typified by an engine mount used mainly between an engine and a vehicle body in order to reduce transmission of vibration from an automobile engine to the vehicle body.
[0002]
[Prior art]
As an engine mount which is a typical example of this type of vibration isolator, the present applicant has previously applied for a patent having a structure described in Japanese Patent Application No. 2003-45061. As shown in FIGS. 3 to 5, the engine mount 50 for which a patent application has been made earlier includes a cylindrical first mounting member 1 mounted on the vehicle body side, and a bolt mounted coaxially with the first mounting member 1. A substantially cylindrical second mounting member 2 mounted on the engine 42 side via 41, a vibration isolating base 3 made of a rubber-like elastic body interposed between the first and second mounting members 1 and 2, and An annular gap 5 in the direction perpendicular to the axis is formed between the substantially disc-shaped stopper flange 4 projecting from the second mounting member 2 in a direction perpendicular to the axial direction thereof and the outer periphery of the stopper flange 4. A stopper rubber 6 provided on the entire inner peripheral surface of the first mounting member 1 is provided.
[0003]
The first mounting member 1 includes a cylindrical main body metal fitting 11, a cup-shaped metal fitting 12 that accommodates the main body metal fitting 11, and a cylindrical stopper metal fitting 13 that is caulked and fixed to the upper end of the main body metal fitting 11. On the upper end side of the stopper fitting 13, there is a flange portion 14 that is bent inwardly. The center portion of the upper surface opening 15 of the first mounting member 1 formed by the inner peripheral edge of the flange portion 14 is the above-mentioned. The 2nd attachment member 2 is penetrated.
[0004]
A diaphragm 16 made of a rubber film is attached to the body fitting 11 of the first mounting member 1 so as to face the vibration isolating base 3, and a liquid sealing chamber 17 is formed between the diaphragm 16 and the vibration isolating base 3. ing. The liquid sealing chamber 17 is partitioned up and down by a partition plate 18 having an elastic film 18 a, and both the upper and lower chambers communicate with each other via an orifice 19 provided on the outer periphery of the partition plate 18.
[0005]
The stopper flange 4 is formed in a substantially elliptical shape having a short axis in one direction perpendicular to the axis, specifically the longitudinal direction X side of the vehicle, and a long axis in the other direction, specifically the left and right direction Y side of the vehicle. Thus, the curvature radius R1 of the outer peripheral edge of the flange portion 4X that contacts the stopper rubber 6 by the impact load input from the front-rear direction X of the vehicle is set to be equal to or less than the curvature radius R of the inner peripheral surface of the first mounting member 1. Has been. In the stopper rubber 6, the rubber thickness of the rubber portion 6X facing the front-rear contact portion 4X of the stopper flange 4 is larger than the rubber thickness of the rubber portion 6Y facing the left-right contact portion 4Y. Of the two thick rubber portions 6X, 6X that are set thick and face each other in the diametrical direction across the axis Z, the inner peripheral surface of the thick rubber portion 6X on the front side of the vehicle has a plurality of circumferential directions. The convex portions 7 having a mountain-shaped cross section and the concave portions 8 having a V-shaped cross section are formed in a concavo-convex shape formed alternately with the apex of each convex portion 7 and the bottom of each concave portion 8 being arranged on a single arc. The inner peripheral surface of the thick rubber portion 6X on the rear side of the vehicle is formed in a curved surface shape without unevenness.
[0006]
Further, a flange-covered rubber portion 6A that covers both the upper and lower surfaces and the inner peripheral edge of the flange portion 14 of the stopper fitting 13 in the first mounting member 1 is integrally formed on the upper portion of the stopper rubber 6. A lip-shaped annular rubber film 6B that closes the upper surface opening 15 extends inward from the upper end portion of the covering rubber portion 6A, and the inner peripheral edge of the annular rubber film 6B is extended to the second end. By elastically contacting the outer peripheral surface of the mounting member 2, water or the like passes through the upper surface opening 15 between the stopper metal 13 of the first mounting member 1 and the second mounting member 2, and the stopper metal 13 in the first mounting member 1. A seal structure for preventing intrusion into the inside has been configured.
[0007]
[Problems to be solved by the invention]
The engine mount of the prior patent application by the present applicant having the above-described configuration receives the main impact load by the abutment of the stopper flange 4 among the impact loads input from the direction perpendicular to the axis as in the longitudinal direction of the vehicle. The thickness of the stopper rubber portion 6X corresponding to the direction to be applied is made larger than the thickness of the other portions, and a plurality of convex portions 7 and concave portions 8 are alternately arranged in the circumferential direction on at least one side of the thick rubber portion 6X. By providing a concave-convex shape to the stopper rubber 6, the stopper rubber 6 can be uniformly distorted, and the stopper rubber 6 can be damaged by cracks and the like due to running on a rough road for a long time. Generation | occurrence | production is suppressed and it has the advantage that predetermined | prescribed anti-vibration performance can be ensured over a long term.
[0008]
On the other hand, in the engine mount of the prior patent application, the flange-covered rubber portion 6A is used as a seal structure for preventing water and the like from entering the stopper fitting 13 through the upper opening 15 of the stopper fitting 13 in the first mounting member 1. A one-stage seal structure is adopted in which the inner peripheral edge of a single lip-shaped annular rubber film 6B integrally extending inward from the upper end of the second member is brought into elastic contact with the outer peripheral surface of the second mounting member 2. In addition, the annular rubber film 6B itself does not impair the vibration-proofing action caused by the relative displacement in the direction perpendicular to the axis between the first mounting member 1 and the second mounting member 2 when an impact load is input. For example, solid foreign matter such as gravel may fly and the annular rubber film 6B may be damaged, or even if it is not damaged, the annular rubber film may be broken due to the weight of the solid foreign matter. The film 6B is deformed inwardly of the shaft, and solid foreign matter enters the stopper fitting 13 in the first mounting member 1, and as a result, the stopper rubber 6 and the vibration isolating base 3 are damaged, resulting in predetermined vibration isolating. The performance was impaired, and the improvement that could shorten the durability life of the engine mount itself was left.
[0009]
The present invention has been made in view of the above circumstances, and by making a simple improvement to the rubber for the stopper, it is possible to suppress the intrusion of solid foreign matters such as gravel into the first mounting member as much as possible. It aims at providing the vibration isolator which can maintain performance stably over a long period of time.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a vibration isolator according to the present invention is a cylindrical first mounting member, and is disposed coaxially with the first mounting member and outward through one end opening of the first mounting member. A protruding cylindrical second mounting member, a vibration-proof base made of a rubber-like elastic body interposed between the first and second mounting members, and a right angle with respect to the axial direction of the second mounting member Rubber for stopper provided on the entire inner peripheral surface of the first mounting member so as to form an annular clearance perpendicular to the axis between the stopper flange projecting in the direction and the outer periphery of the stopper flange In the vibration isolator, the stopper rubber is integrally provided with a flange-covered rubber portion that covers a flange portion that is bent inwardly on one end opening side of the cylindrical first mounting member. This flange cover is formed A lip-shaped annular rubber film for closing the opening is inwardly extended from a plurality of axial portions of the rubber portion inwardly, and inner peripheral edges of the plurality of the annular rubber films are formed on the second mounting member. A plurality of stages of seal structures are formed in the axial direction between the first mounting member and the second mounting member in elastic contact with the outer peripheral surface.
[0011]
According to the present invention having the above-described configuration, a part of the rubber for stopper is improved such that a plurality of lip-shaped annular rubber films are extended inward from the flange-covered rubber portion covering the flange portion of the first mounting member. By simply doing, a multi-stage seal structure can be easily configured in the axial direction between the first mounting member and the second mounting member, and this multi-stage seal structure not only prevents water from entering, but also gravel, etc. Even if the solid foreign matter flies, it is possible to suppress the occurrence of the situation where the solid foreign matter enters the first mounting member as much as possible. As a result, it is possible to greatly reduce the durability of the vibration isolator as a whole by greatly reducing that the rubber for a stopper and the vibration isolator base are damaged by solid foreign matters and the predetermined vibration isolating performance is impaired.
[0012]
As the annular rubber film in the vibration isolator according to the present invention, a seal structure having three or more stages in the axial direction may be formed by extending inward from three or more locations in the axial direction of the flange-covered rubber portion. However, if the number of the annular rubber films is too large, the relative displacement resistance in the direction perpendicular to the axis between the first mounting member and the second mounting member at the time of input of the impact load increases, and the predetermined vibration isolating function may be impaired. Therefore, as described in claim 2, two annular rubber films are extended inward from both ends in the axial direction of the flange-covered rubber portion, and the two annular rubber films It is most desirable to form a two-stage seal structure in the axial direction between the first mounting member and the second mounting member.
[0013]
Further, in the vibration isolator according to the present invention, as described in claim 3, at least the inner side of the first mounting member among the plurality of annular rubber films constituting the axially plural-stage or two-stage seal structure It is desirable to form one annular rubber film located in a conical shape gradually outward in the axial direction toward the inner peripheral edge side elastically contacting the outer peripheral surface of the second mounting member with respect to the base end portion. In this case, while increasing the elastic contact area and elastic contact force of the inner peripheral edge of the annular rubber film formed in the conical shape with respect to the outer peripheral surface of the second attachment member to enhance the sealing effect, The relative displacement resistance in the direction perpendicular to the axis with respect to the mounting member can be reduced. In addition, even if the annular rubber film located on the outermost side in the axial direction is damaged and solid foreign matter such as gravel enters, the intruding solid foreign matter is separated from the conical annular rubber membrane and the axially outer side thereof. Can be accommodated and retained in an annular space formed by the annular rubber film and the outer peripheral surface of the second mounting member, and the effect of preventing solid foreign matter from entering the first mounting member can be further enhanced. it can.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a main part of a liquid-filled automobile engine mount which is a typical example of a vibration isolator according to the present invention. In this engine mount 50, a flange-covered rubber portion 6A of a stopper rubber 6 is shown. Two lip-shaped annular rubber films 6B1 and 6B2 that close the upper surface opening 15 of the stopper fitting 13 are extended integrally from both ends in the axial direction, that is, from the upper and lower ends to the inside. The inner peripheral edges of the rubber films 6B1 and 6B2 are brought into elastic contact with the outer peripheral surface of the second mounting member 2 so that the upper surface opening 15 is passed between the stopper fitting 13 of the first mounting member 1 and the second mounting member 2. A seal structure that prevents solid foreign matters such as water or gravel from entering the stopper fitting 13 in the first mounting member 1 is formed in two stages in the axial direction.
[0015]
Of the two annular rubber films 6B1 and 6B2 constituting the two-stage seal structure in the axial direction, the annular rubber film 6B1 at the upper end is formed in a disc shape along a substantially horizontal plane, and the inner side of the stopper fitting 13 The annular rubber film 6B2 at the lower end located on the side has a conical shape such that the inner peripheral edge side elastically contacting the outer peripheral surface of the second mounting member 2 is gradually positioned outward in the axial direction with respect to the base end thereof. The conical annular rubber film 6B2, the disc-shaped annular rubber film 6B2 at the upper end, and the outer peripheral surface of the second mounting member 2 whose inner peripheral edges are in elastic contact with each other, A butterfly-shaped sealed annular space 20 is formed.
[0016]
Except for the configuration of the sealing structure described above, the configuration is exactly the same as the conventional engine mount shown in FIGS. 3 to 5 (the prior patent application filed by the present applicant), and a detailed description thereof will be omitted here. .
[0017]
The stopper rubber 6 is integrally vulcanized with the stopper fitting 13 of the first mounting member 1. In this case, the flange portion 14 of the stopper fitting 13 is formed with a through hole 10 for positioning the stopper rubber 6 and the stopper fitting 13 by part of the vulcanized rubber entering during the integral vulcanization molding. Accordingly, two thick rubber portions opposed to each other in the diametrical direction in the stopper rubber 6, that is, the uneven thick rubber portion 6 </ b> X and the curved thick rubber portion 6 </ b> X having no unevenness are front and rear in the stopper flange 4. The stopper rubber 6 is fixed to the stopper fitting 13 in a state of facing the contact portions 4X in the direction. Instead of such integral vulcanization molding, the stopper rubber 6 is vulcanized and molded separately from the first mounting member 1 and the vulcanized molding of the stopper rubber 6 is a stopper of the first mounting member 1. You may make it attach to the metal fitting 13 by a fitting type.
[0018]
In the engine mount 50 configured as described above, when an impact load is input from the front-rear direction X of the vehicle, particularly from the front side of the vehicle, as the vehicle travels, the abutting portion of the front side of the stopper flange 4 4X is received by contacting the apexes of the plurality of convex portions 7 formed at regular intervals in the circumferential direction on the thick rubber portion 6X of the stopper rubber 6. Even if the impact load in the direction perpendicular to the axis is repeatedly input due to vibration caused by running on a rough road for a long time without distortion, it is possible to suppress the occurrence of damage such as cracks in the stopper rubber 6 and Therefore, it is possible to suppress the generation of abnormal noise and vibration associated with the contact between the stopper flange 4 and the inner peripheral surface of the first mounting member 1 even when an impact load is input from the front side when the vehicle is accelerated. Can .
[0019]
In addition, the stopper rubber 6 is integrally formed so as to close the upper surface opening 15 of the stopper fitting 13 inward from the flange-covered rubber portion 6A covering the flange portion 14 of the stopper fitting 13 in the first mounting member 1. Two extended lip-shaped annular rubber films 6B1 and 6B2 form a two-stage seal structure between the stopper fitting 13 and the second mounting member 2 in the axial direction. In addition to preventing muddy water, etc., scattered from the front, etc., from entering the inside of the stopper fitting 13 at times, even if solid foreign objects such as gravel fly, they are prevented in two steps. Thus, the occurrence of a situation in which solid foreign matter such as gravel penetrates into the stopper fitting 13 and damages the stopper rubber 6 and the vibration isolating base 3 can be suppressed as much as possible to maintain a predetermined vibration isolating performance. Both can be increased engine mount 50 the whole service life.
[0020]
Particularly, of the two annular rubber films 6B1 and 6B2, the annular rubber film 6B2 at the lower end located on the inner side of the stopper fitting 13 elastically contacts the outer peripheral surface of the second mounting member 2 with respect to the base end thereof. Since it is formed in a conical shape such that the inner peripheral edge is gradually located outward in the axial direction, the elastic contact area of the inner peripheral end of the conical annular rubber film 6B2 with respect to the outer peripheral surface of the second mounting member 2 In addition, it is easy to increase the elastic contact force and enhance the sealing effect, and the relative displacement resistance in the direction perpendicular to the axis between the first mounting member 1 and the second mounting member 2 can be reduced to ensure a predetermined vibration isolating performance.
[0021]
Further, the conical annular rubber film 6B2, the disk-shaped annular rubber film 6B2 at the upper end, and the outer peripheral surface of the second mounting member 2 in which the inner peripheral edge thereof is in elastic contact are sealed in a substantially butterfly cross section. Since the annular space portion 20 is formed, even if the annular rubber film 6B1 positioned on the outermost side in the axial direction is damaged and solid foreign matters such as gravel enter, the intruding solid foreign matter enters the annular space portion 20. It can be accommodated and retained, and the effect of preventing solid foreign matter from entering the stopper fitting 13 in the first mounting member 1 can be further enhanced.
[0022]
In the above embodiment, the two annular rubber films 6B1 and 6B2 form a two-stage seal structure in the axial direction. However, as shown in FIG. 2A, three annular rubber films 6B1 to 6B3 are formed. The three-stage seal structure may be configured by using, and as shown in (b), among the three annular rubber films 6B1, 6B2, 6B3 constituting the three-stage seal structure, the lowermost ring rubber The film 6B3 may be formed in a conical shape as described above, and further, as shown in (c), the two annular rubber films 6B1 and 6B2 constituting the two-stage seal structure are both formed in a conical shape. Also good.
[0023]
Moreover, in the said embodiment, among the two thick rubber parts 6X and 6X which oppose in a diameter direction on both sides of the shaft center Z, the inner peripheral surface of the thick rubber part 6X of the vehicle front side is plural in the circumferential direction. Are formed in an uneven shape in which convex portions 7 having a mountain-shaped cross section and concave portions 8 having a V-shaped cross section are alternately provided, and the inner peripheral surface of the thick rubber portion 6X on the rear side of the vehicle is formed in a curved surface shape having no unevenness. As shown in the figure, the entire surface of the inner surface of the stopper rubber 6 may be provided with convex portions having a mountain-shaped cross section and concave portions having a V-shaped cross section, which are formed in an uneven shape on the entire circumference.
[0024]
【The invention's effect】
In short, according to the present invention, a plurality of lip-shaped annular rubber films are extended inward from the flange-covered rubber portion that covers the flange portion of the first mounting member, so that the first mounting member and the second mounting Since a multi-stage seal structure is formed between the member and the member in the axial direction, it is possible to prevent intrusion of muddy water, etc., and even if solid foreign matter such as gravel can fly, the solid foreign matter is the first mounting member. Occurrence of a situation that enters the inside can be suppressed as much as possible. Therefore, the rubber for the stopper and the anti-vibration base can be prevented from being damaged by the solid foreign matter by simple and inexpensive means that only improve a part of the rubber for the stopper instead of using a special sealing member. There is an effect that a predetermined vibration isolating performance can be ensured over a long period of time and the durability life of the entire vibration isolating apparatus can be increased.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a configuration of a main part of a liquid-filled automobile engine mount which is a typical example of a vibration isolator according to the present invention.
FIGS. 2 (a) to 2 (c) are enlarged vertical sectional views of a main part showing another embodiment of an engine mount.
FIG. 3 is a longitudinal sectional view showing a configuration of a conventional automobile engine mount previously filed by the present applicant.
4 is a plan view of FIG. 3;
5 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st attachment member 2 2nd attachment member 3 Anti-vibration base | substrate 4 Stopper flange 5 Annular gap 6 Stopper rubber 6A Flange coating rubber part 6B1-6B3 Annular rubber film 14 Flange part 15 Upper surface opening part 50 Engine mount

Claims (3)

A cylindrical first mounting member, a columnar second mounting member arranged coaxially with the first mounting member and projecting outward through one end opening of the first mounting member, and the first and second 2. A vibration-proof base made of a rubber-like elastic body interposed between the mounting members, a stopper flange protruding from the second mounting member in a direction perpendicular to the axial direction thereof, and an outer periphery of the stopper flange In the vibration isolator comprising a stopper rubber provided on the entire inner peripheral surface of the first mounting member so as to form an annular gap in the direction perpendicular to the axis between the first and second parts,
The stopper rubber is integrally formed with a flange-covered rubber portion that covers a flange portion that is bent inwardly on one end opening side of the cylindrical first mounting member. A lip-shaped annular rubber film that closes the opening from a plurality of axial directions to the inside is integrally extended, and an inner peripheral edge of the plurality of annular rubber films is an outer peripheral surface of the second mounting member. A vibration isolator comprising a plurality of stages of seal structures in the axial direction between the first mounting member and the second mounting member. Two annular rubber films are extended inward from both ends in the axial direction of the flange-covered rubber portion, and the shaft is interposed between the first mounting member and the second mounting member by the two annular rubber films. The vibration isolator according to claim 1, wherein a two-stage seal structure is formed in the direction. Among the plurality of annular rubber films constituting the seal structure, at least one annular rubber film positioned on the inner side of the first mounting member is in an inner surface that is elastically contacted with the outer peripheral surface of the second mounting member with respect to the base end portion. The anti-vibration device according to claim 1, wherein the vibration isolator is formed in a conical shape that gradually moves outward in the axial direction toward the peripheral edge.

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