JP2004183676A - Vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damper of light weight and low cost having a stopper mechanism to excessive displacement in upward and horizontal directions of a vibration damper base body. <P>SOLUTION: A first installation member 10 provided with an inner cylinder 16 and a second installation member 12 provided with an opening part 30 surrounding the inner cylinder are coupled by the vibration damper base body 14. An upper surface of the vibration damper base body 14 is bonded to a flange part 22 at an upper end of the inner cylinder 16, while an inner circumferential surface of it is kept unbonded to a circumferential surface of the inner cylinder 16. A plurality of protruded parts 42 are provided to be axially extended on the inner circumferential surface. A stopper rubber 46 is provided on an inner circumferential surface of a cylindrical part 36 extended from the opening part 30, while a gap 48 is secured. A first stopper part 50 to limit horizontal displacement of the inner cylinder 16 is provided. Between an extended part 54 provided on the inner cylinder 16 and a lower end of the cylinder part 36, a stopper rubber 56 is provided, while a gap 58 is secured. A second stopper part 60 to limit displacement of the inner cylinder 16 upward is provided. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device mainly used to support a vibration body such as an automobile engine in a vibration-proof manner.
[0002]
[Prior art]
In a vibration isolator such as a mount that supports a vibrating body such as an automobile engine so that the vibration is not transmitted to a support body such as a vehicle body, in order to prevent deformation of a vibration isolating base, which is a rubber elastic body, beyond a certain limit. Is provided with a stopper mechanism, and various structures have been conventionally proposed (for example, see Japanese Patent Application Laid-Open No. 10-9330).
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. Hei 10-9330.
[0004]
FIG. 3 shows an example of a conventional vibration isolator. This vibration isolator includes an upper mounting member 101 mounted on the engine side which is a vibrating body, a lower mounting member 102 mounted on the vehicle body side which is a support body, and an upper mounting member 101 and a lower mounting member 102. And an anti-vibration base 103 made of a rubber-like elastic body which couples the two members. The upper anti-vibration base 103 elastically supports the upper mounting member 101 with respect to the lower mounting member 102 in the vertical direction. It is configured as follows. On the upper part of the upper mounting member 101, a stopper projection 105 projecting outward and covered with a stopper rubber 104 is provided. A substantially Ω-shaped stopper metal fitting 106 is provided so as to cover the upper surface and both side surfaces of the stopper projection 105 with a predetermined gap therebetween. To be fixed against.
[0005]
In this conventional vibration isolator, the side surface of the stopper projection 105 is provided with a stopper fitting against an excessive displacement of the upper mounting member 101 and the lower mounting member 102 in the horizontal direction, more specifically, in the longitudinal direction of the vehicle. By contacting the side wall 106 </ b> A of 106, the displacement of a certain degree or more is regulated. In addition, when the upper mounting member 101 is excessively displaced upward, the upper surface of the stopper projection 105 comes into contact with the upper wall 106B of the stopper fitting 106, so that the displacement of a certain degree or more is restricted.
[0006]
[Problems to be solved by the invention]
2. Description of the Related Art In recent years, there has been a strong demand for low fuel consumption and low cost in automobiles, and accordingly, demands for lighter weight and lower cost of vehicle parts from automobile manufacturers have also become stricter every day. Under such circumstances, in the above-mentioned conventional vibration isolator, since the stopper action against excessive displacement in the upward and horizontal directions is exerted by the Ω-type stopper fitting, it is sufficient for the demand for weight reduction and cost reduction. Can not respond to
[0007]
The present invention has been made in view of such a point, and an object of the present invention is to provide an anti-vibration device having a stopper mechanism against excessive displacement in the horizontal direction and above the anti-vibration base at a light weight and at low cost. I do.
[0008]
[Means for Solving the Problems]
The vibration damping device of the present invention includes a first mounting member that is provided on the vibrating body side with a shaft portion arranged with the axial direction directed in the up-down direction, and is mounted on the support body side with an opening surrounding the shaft portion. A second mounting member, and a first mounting member which is interposed between the first mounting member and the opening of the second mounting member and is connected to the second mounting member so that the first mounting member is vertically movable with respect to the second mounting member; A vibration-proof base made of a rubber-like elastic body elastically supported on the shaft part, an outward flange is provided at an upper end of the shaft part, and an upper surface of the vibration-proof base is adhered to a lower surface of the flange part, The inner peripheral surface of the vibration isolating base is not adhered to the peripheral surface of the shaft portion, and a plurality of convex portions extending in the axial direction are formed on the inner peripheral surface of the vibration isolating base. A cylindrical portion extends downward from the opening edge, and a first stopper rubber is provided on an inner peripheral surface of the cylindrical portion. A predetermined gap is provided between the first stopper rubber and the shaft portion in a direction perpendicular to the axis, so that displacement of the first mounting member and the second mounting member in the horizontal direction is limited. A first stopper portion is provided, and an extending portion extending downward from the lower end of the shaft portion toward the lower side of the cylindrical portion is provided, between the extending portion and the lower end of the cylindrical portion. A second stopper rubber is provided to limit upward displacement of the first mounting member with respect to the second mounting member by securing a predetermined gap in the axial direction. Things.
[0009]
According to the anti-vibration device of the present invention, the first anti-horizontal displacement of the anti-vibration base in the horizontal direction between the shaft portion of the first mounting member and the tubular portion of the second mounting member surrounding the first mounting member. In addition to the provision of the stopper portion, the second stopper portion for restricting the upward displacement of the vibration-proof base between the extending portion extending from the lower end of the shaft portion and the lower end of the cylindrical portion is provided. It is no longer necessary to provide a conventional Ω-type stopper fitting, so that the weight and cost of the vibration isolator can be reduced.
[0010]
Further, the upper surface of the vibration isolating base is adhered to a flange portion provided at the upper end of the shaft portion of the first mounting member, and the inner peripheral surface of the vibration isolating substrate is not adhered to the peripheral surface of the shaft portion. Can be improved in durability. Here, the term “adhesion” means that both are fixed by a vulcanization bonding means or an adhesive, and the term “non-adhesion” means that they are not fixed by such means. Therefore, the simply contacted state is included in non-adhesion.
[0011]
Furthermore, by providing a plurality of projections extending in the axial direction on the inner peripheral surface of the vibration-proof base, while the inner peripheral surface of the vibration-proof base is not bonded to the peripheral surface of the shaft portion as described above, A sudden increase in contact pressure between the vibration isolating base and the shaft is prevented, and generation of abnormal noise can be prevented. In addition, since the plurality of protrusions extend in the axial direction, the protrusions do not have an undercut shape when the vibration isolating base is formed, and the mold can be removed after the formation. In order to more effectively prevent the sudden increase in the contact pressure as described above, the inner peripheral surface of the vibration-isolating base is provided with the convex portions and the concave portions alternately in the circumferential direction to form a horizontal cross-sectional waveform. Preferably, it is formed.
[0012]
In the vibration damping device according to the present invention, the first stopper rubber is provided so as to cover the inner peripheral surface of the cylindrical portion with rubber continuous from the vibration damping base, and the second stopper rubber is formed of the first stopper rubber. May be provided so as to cover the lower surface of the cylindrical portion with a rubber continuous from. By forming the first stopper rubber and the second stopper rubber with the integral rubber continuous from the vibration isolating base, further cost reduction can be achieved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an anti-vibration device according to an embodiment of the present invention will be described with reference to the drawings.
[0014]
The anti-vibration device of the embodiment is an engine mount that supports the right side portion of the engine of the FF vehicle to a member on the vehicle body side in an anti-vibration manner. This vibration isolator includes a first metal attachment member 10 attached to an engine that is a vibrator, a second metal attachment member 12 that is attached to a vehicle body member that is a support, and a first attachment member 10 and a second attachment member 10. And a vibration isolating base made of a rubber elastic body interposed between the mounting member and the mounting member.
[0015]
The first mounting member 10 is an inner cylinder 16 that is a shaft portion that stands upright, a bracket 18 that connects the inner cylinder 16 and the engine, and a state that is sandwiched between the inner cylinder 16 and the bracket 18. And a flange-shaped plate 20 interposed therebetween. The inner cylinder 16 is made of a metal cylinder, and is arranged with its axial direction facing up and down. The plate 20 is formed in a disk shape having a diameter larger than the outer diameter of the inner cylinder 16, and is fixed to the upper surface of the inner cylinder 16, so that the upper end of the inner cylinder 16 faces outward, that is, a flange that spreads radially outward. The part 22 is formed. The flange portion 22 is formed in a stepped shape downward in detail. A bolt 24 is inserted into the inner cylinder 16 from below, and the bolt 24 passes through a through hole 26 at the center of the plate 20 and is fastened to the female screw portion 28 of the bracket 18 so that the upper end of the inner cylinder 16 The bracket 18 is fixed with the interposition of the bracket 20.
[0016]
The second mounting member 12 has a flat plate shape, a substantially circular opening 30 into which the inner cylinder 16 is inserted, and a mounting surface portion 32 for attaching to the vehicle body at two radially opposed positions. Have been. The peripheral portion 34 of the second mounting member 12 is formed in a flange shape bent upward for reinforcement.
[0017]
The opening 30 of the second mounting member 12 surrounds the inner cylinder 16 substantially coaxially, and a short cylindrical part 36 extends downward from the opening edge thereof. The lower end of 36 is formed as a flange portion 38 bent outward.
[0018]
The anti-vibration base 14 has a cylindrical shape that spreads in a reverse taper shape downward, and connects the above-described plate 20 and the opening 30 of the second mounting member 12, whereby the first mounting member 10 is The second mounting member 12 is elastically supported in the up-down direction. More specifically, the vibration-isolating base 14 has its upper surface fixed to the lower surface of the flange portion 22 of the plate 20 and its lower end fixed to the periphery of the opening 30 of the second mounting member 12 by vulcanization bonding means. Since the upper surface of the vibration-proof base 14 is bonded to the lower surface of the flange portion 22, the flange portion 22 can effectively receive a downward load from the engine.
[0019]
The inner peripheral surface of the vibration-proof base 14 is not vulcanized and bonded to the peripheral surface of the inner cylinder 16, and in consideration of insertability when assembling the inner cylinder 16, the inner peripheral surface and the inner cylinder 16 are not bonded. And a slight gap 40 is secured between them. On the inner peripheral surface of the vibration-proof base 14, a plurality of (in detail, ten) convex portions 42 and concave portions 44 extending in the axial direction are alternately and circumferentially arranged at equal intervals in the circumferential direction as shown in FIG. It is formed. The convex portion 42 protrudes in a curved surface radially inward, and the concave portion 44 is concave in a curved surface radially outward, so that the inner peripheral surface of the vibration-proof base 14 has a horizontal cross-section. It is formed in a shape.
[0020]
1 and 2 show an unloaded state where no load is applied to the engine. In a state where the load is applied to the engine, the vibration isolating base 14 is elastically deformed. May be configured such that the inner peripheral surface thereof and the peripheral surface of the inner cylinder 16 are partially or entirely in contact with each other.
[0021]
A stopper rubber 46 is provided between the cylindrical portion 36 of the second attachment member 12 and the inner cylinder 16, and a predetermined gap 48 is ensured in a direction perpendicular to the axis, so that the inner cylinder 16 and the second attachment 16 are secured. A first stopper portion 50 for limiting excessive displacement in the horizontal direction with the member 12 is provided. The stopper rubber 46 is provided so as to cover the inner peripheral surface of the cylindrical portion 36 with rubber continuous from the vibration isolating base 14, and a stopper clearance is provided between the inner peripheral surface of the stopper rubber 46 and the peripheral surface of the inner cylinder 16. Is set.
[0022]
A stopper fitting 52 is fixed to the lower end of the inner cylinder 16 by the bolt 24. The stopper fitting 52 has a disk shape and includes an extension 54 extending outward below the flange 38 at the lower end of the cylindrical portion 36. A stopper rubber 56 is provided between the extending portion 54 and the flange portion 38, and a predetermined gap 58 is secured in the axial direction, whereby the second mounting member 12 of the inner cylinder 16 is provided. A second stopper portion 60 for limiting an excessive upward displacement with respect to is provided. The stopper rubber 56 is provided so as to cover the lower surface of the flange portion 38 with rubber continuous from the stopper rubber 46 covering the inner peripheral surface of the cylindrical portion 36.
[0023]
FIG. 1 shows an unloaded state where no load is applied to the engine as described above. The gap 58 is set so that a predetermined dimension is secured when the load is applied to the engine. Just fine. Therefore, when no load is applied, the stopper rubber 56 and the extending portion 54 may be in contact with each other.
[0024]
A block-shaped stopper rubber 62 is provided on the upper surface of the second mounting member 12 near the opening 30. The stopper rubber 62 is provided in a region from the opening 30 of the second mounting member 12 to two mounting surfaces 32 on the vehicle body outside the opening 30. The stopper rubber 62 is provided by rubber continuous from the vibration isolating base 14, and thus is fixed to the upper surface of the second mounting member 12 by vulcanization bonding means.
[0025]
The bracket 18 of the first mounting member 10 is provided with a stopper receiving portion 64 which is opposed to the stopper rubber 62 via a predetermined gap and protrudes downward. The stopper rubber 62 and the stopper receiving portion 64 provide a third stopper portion 66 for limiting the downward displacement of the first mounting member 10 with respect to the second mounting member 12. FIG. 1 also shows an unloaded state in which the engine load is not applied to the third stopper portion 66, and the gap between the stopper rubber 62 and the stopper receiving portion 64 is loaded with the engine load. What is necessary is just to set so that a predetermined dimension is ensured when it is performed.
[0026]
In the vibration isolator according to the present embodiment as described above, in the assembled state, the gap 58 between the second stopper portion 60 and the gap between the third stopper portion 66 becomes a predetermined size when the load of the engine is applied. Only secured. For example, both gaps can be set to about 7 mm each. The gap 48 of the first stopper 50 hardly changes depending on the presence or absence of the load of the engine, and can be set to, for example, about 5 mm.
[0027]
In use, the vibration isolator can attenuate normal vibration from the engine or the vehicle body by the vibration isolator 14.
[0028]
When an excessive displacement occurs in the horizontal direction with respect to the inner cylinder 16, the inner cylinder 16 in the first stopper portion 50 comes into contact with the outer cylindrical portion 36 via the stopper rubber 46, so that a stopper action is performed. Is performed, and further displacement is limited. At this time, since the first stopper portion 50 is provided over the entire circumference of the inner cylinder 16, the first stopper portion 50 acts as a stopper not only for the excessive displacement in the longitudinal direction of the vehicle but also for the excessive displacement in the lateral direction as in the conventional case. Can be fulfilled.
[0029]
When an excessive upward displacement of the inner cylinder 16 occurs, the extended portion 54 of the stopper fitting 52 at the lower end of the inner cylinder 16 in the second stopper portion 60 is connected to the upper flange portion via the stopper rubber 56. Abutment with 38 acts as a stopper, limiting upward displacement.
[0030]
Further, when an excessive downward displacement occurs with respect to the inner cylinder 16, the stopper receiving portion 64 of the bracket 18 in the third stopper portion 66 comes into contact with the stopper rubber 62 below the third stopper portion 66, so that the stopper effect is achieved. And downward displacement is limited.
[0031]
According to the vibration isolator of the present embodiment described above, the stopper function for limiting excessive displacement in the horizontal direction can be exhibited by the simple structure provided on the second mounting member 12, and the first mounting member 10 By the compact stopper fitting 52 provided on the inner cylinder 16, a stopper function for restricting excessive upward displacement can be exerted. For this reason, a stopper function against excessive displacement in the upper and horizontal directions of the vibration isolating base 14 can be exerted by a structure that is much more compact and lighter than the conventional structure.
[0032]
Further, since the inner peripheral surface of the vibration isolating base 14 has a non-adhesive structure to the peripheral surface of the inner cylinder 16, the durability of the rubber on the vibration isolating base 14 can be improved. That is, in a case where the inner peripheral surface of the vibration isolating base 14 is bonded to the peripheral surface of the inner cylinder 16, in order to secure the gap 48 of the first stopper 50, the lower surface of the vibration isolating base 14 in FIG. It is necessary to provide the concave portion X as shown by a two-dot chain line. The concave portion X has to reduce the radius of curvature at the bottom in order to make the stopper clearance a predetermined size, and therefore the free length of the rubber near the bottom is short, which may cause a problem in the durability of the rubber. There is. On the other hand, with the non-adhesive structure of the present embodiment, such a problem does not occur and the durability is excellent.
[0033]
By the way, when the inner peripheral surface of the anti-vibration base 14 has a non-adhesive structure to the peripheral surface of the inner cylinder 16, the inner peripheral surface of the anti-vibration base 14 is caused by the vertical displacement or the horizontal displacement of the first mounting member 10. Will repeatedly contact and detach with the peripheral surface of the inner cylinder 16, and this contact will cause abnormal noise. In the present embodiment, the provision of the irregularities 42 and 44 on the inner peripheral surface of the vibration-proof base 14 prevents a sudden increase in the contact pressure between the vibration-proof base 14 and the inner cylinder 16. Generation of abnormal noise can be prevented.
[0034]
In addition, since the irregularities 42 and 44 provided to prevent the generation of abnormal noise extend in the axial direction, the anti-vibration base 14 does not assume an undercut shape during vulcanization molding, and can be released from the mold after molding. is there. In addition, since the irregularities 42 and 44 extend in the axial direction, the air between the inner peripheral surface of the vibration-isolating base 14 and the peripheral surface of the inner cylinder 16 is displaced along the concave portion 44 extending in the axial direction when they contact each other. It is possible to escape downward, thereby preventing generation of abnormal noise due to air entrapment.
[0035]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the anti-vibration device of this invention, the anti-vibration device which has a stopper mechanism with respect to the excessive displacement of an anti-vibration base above and in the horizontal direction can be provided at low weight and low cost. This can contribute to cost reduction. In addition, the durability of the vibration-proof substrate can be improved, and generation of abnormal noise can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a vibration isolator according to one embodiment of the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a sectional view of a conventional vibration isolator.
[Explanation of symbols]
10 first mounting member 12 second mounting member 14 anti-vibration base 16 inner cylinder 22 flange 30 opening 36 cylindrical part 42 convex part 44 concave part 46 ... stopper rubber (first stopper rubber)
50 first stopper portion 54 extended portion 56 stopper rubber (second stopper rubber)
60 second stopper part

Claims (3)

A first attachment member that is attached to the vibrating body side with a shaft portion that is arranged with the axial direction facing up and down,
A second mounting member that has an opening surrounding the shaft and is mounted on the support body side;
A rubber member interposed between the first mounting member and the opening of the second mounting member and elastically supporting the first mounting member vertically with respect to the second mounting member by connecting the two. A vibration-proof base made of an elastic body,
An outward flange portion is provided at the upper end of the shaft portion, and an upper surface of the vibration-proof base is adhered to a lower surface of the flange portion, and an inner peripheral surface of the vibration-proof substrate is arranged with respect to a peripheral surface of the shaft portion. A plurality of protrusions extending in the axial direction are formed on the inner peripheral surface of the vibration-proof base,
A cylindrical portion extends downward from an opening edge of the opening portion, a first stopper rubber is provided on an inner peripheral surface of the cylindrical portion, and an axis perpendicular to the axis is provided between the first stopper rubber and the shaft portion. When a predetermined gap is secured in the direction, a first stopper portion for limiting displacement of the first mounting member and the second mounting member in the horizontal direction is provided,
An extended portion is provided extending from the lower end of the shaft portion outwardly below the tubular portion, and a second stopper rubber is provided between the extended portion and the lower end of the tubular portion. An anti-vibration device, wherein a second stopper portion is provided to limit upward displacement of the first mounting member with respect to the second mounting member by securing a predetermined gap in the direction. The first stopper rubber is provided so as to cover an inner peripheral surface of the cylindrical portion with rubber continuous from the vibration isolating base, and the second stopper rubber is provided on a lower surface of the cylindrical portion with rubber continuous from the first stopper rubber. 2. The vibration damping device according to claim 1, wherein the vibration damping device is provided by coating. 3. An anti-vibration device according to claim 1, wherein an inner peripheral surface of the anti-vibration base has a horizontal cross-sectional waveform in which the convex portions and the concave portions are alternately provided in a circumferential direction.

Images