JP4187147B2 - Liquid-filled vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, a vibration isolating base made of a rubber-like elastic body is interposed between an inner cylinder and an outer cylinder, and a pair of liquid chambers positioned with the inner cylinder sandwiched between the inner cylinder and the outer cylinder, A liquid which is provided so as to be deformable in accordance with the relative displacement of the inner cylinder and the outer cylinder, forms an orifice for communicating both liquid chambers, and is provided with stopper means for suppressing the relative displacement between the inner cylinder and the outer cylinder within a predetermined range. The present invention relates to a sealed vibration isolator.
[0002]
[Prior art]
As an example of the above-described vibration isolator, there is a liquid filled type vibration isolator provided between a suspension member and a lower arm of an automobile. In this liquid filled type vibration isolator, the vibration isolating base is elastically deformed by vibration, and the inner cylinder and the outer cylinder are relatively displaced. Along with this, the volume of both liquid chambers changes and the liquid flows through the orifice, and an excellent vibration damping effect is obtained by a liquid flow effect such as a resonance action. The stopper means prevents excessive relative displacement between the inner cylinder and the outer cylinder.
[0003]
As shown in FIGS. 6 and 7, the stopper means 6 generally comprises a stopper portion 11 on the inner cylinder 1 side and a stoppered portion 12 on the outer cylinder 2 side. Conventionally, an inner cylinder portion 13 having a constant outer diameter is provided. A stopper portion 11 is formed by covering with a covering portion 14 made of a rubber-like elastic body and having a certain thickness, and an inner peripheral surface of a ring-shaped orifice forming member 15 fitted in the outer tube 2 is formed on the inner tube portion 13. (FIG. 6 and FIG. 7, 3 is an anti-vibration base made of a rubber-like elastic body, 4 is a liquid chamber, 5 is an orifice, and 10 is a rubber. It is a liquid chamber forming wall made of an elastic body.
[0004]
[Problems to be solved by the invention]
For example, among a pair of front and rear vibration isolator provided between the suspension member and the lower arm, in a vertically placed type (type whose axis is along the vertical direction) provided on the rear side, FIG. As shown in FIG. 9, the outer cylinder 2 changes its position in the radial direction while being inclined with respect to the inner cylinder 1 by the input of vibration, and the stopper portion 11 and the stopper portion 12 abut against each other in an inclined posture.
[0005]
According to the above-described conventional configuration, the stopper portion 11 is configured by covering the inner cylinder portion 13 having a constant outer diameter with the covering portion 14 having a certain thickness made of a rubber-like elastic body, and is fitted into the outer cylinder 2. Since the inner peripheral surface of the ring-shaped orifice forming member 15 is formed in a curved surface corresponding to the inner cylinder portion 13 to constitute the stopper portion 12, the outer cylinder is formed as shown in FIGS. When the position is changed in the radial direction while 2 is inclined with respect to the inner cylinder 1, the corner portion 19 of the stopper portion 12 is easy to crush and damage the covering portion 14.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid-filled vibration isolator capable of extending the life of the covering portion made of a rubber-like elastic body or the like provided in the stopper means. It is in.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, a vibration isolating base made of a rubber-like elastic body is interposed between the inner cylinder and the outer cylinder, and a pair of the inner cylinder is sandwiched between the inner cylinder and the outer cylinder. Stopper means for providing a liquid chamber so as to be deformable in accordance with the relative displacement of the inner cylinder and the outer cylinder, forming an orifice for communicating both liquid chambers, and suppressing the relative displacement between the inner cylinder and the outer cylinder within a predetermined range The stopper means comprises a spherical stopper portion and a stoppered portion that is recessed in a partial spherical shape so as to be distributed between the inner cylinder side and the outer cylinder side. Citea is, the stopper portion, causes bulging of the inner cylinder portion of the side corresponding to the liquid chamber spherically coating of constant thickness formed of the outer peripheral surface of the inner cylinder part spherical shape from a rubber-like elastic body The stopper portion is formed by a cover having an orifice forming groove on the outer peripheral portion. The grayed-shaped orifice forming member is fitted in the outer cylinder, the inner circumferential portion of the orifice forming member is formed by recessing the partially spherical lies in Ru tare.
[0010]
According to a second aspect of the present invention, in the structure of the first aspect of the present invention, the anti-vibration base is composed of a pair of anti-vibration base portions sandwiching the inner cylinder, and the liquid chamber is formed around the inner and outer cylinders. Between the two anti-vibration base portions in the direction, a pair of opposing liquid chamber forming walls made of a rubber-like elastic body are formed so as to cover from the outer side in the axial direction of the inner and outer cylinders.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, among a pair of front and rear vibration isolation devices provided between a front suspension member and a lower arm (both not shown) of the automobile, a vertically installed type (type whose axis is along the vertical direction) provided on the rear side ) Is shown. Incidentally, the anti-vibration device on the front side is a horizontal type in which the axis is along the front-rear direction.
[0012]
The liquid-filled vibration isolator comprises a rubber-like elastic body between a thick inner cylinder 1 through which a mounting bolt to a suspension member is inserted and a thin outer cylinder 2 press-fitted into a lower arm side mounting hole. A pair of liquid chambers 4 located between the inner cylinder 1 and the outer cylinder 2 with the vibration base 3 interposed therebetween can be freely deformed with the relative displacement of the inner cylinder 1 and the outer cylinder 2 (details). The volume is freely changeable), an orifice 5 for communicating the two liquid chambers 4 is formed, and a stopper means 6 is provided for suppressing the relative displacement between the inner cylinder 1 and the outer cylinder 2 within a predetermined range.
[0013]
The anti-vibration base 3 is composed of a pair of anti-vibration base portions 8 positioned with the inner cylinder 1 in between, and one end face side of both the anti-vibration base portions 8 in the radial direction of the inner and outer cylinders 1 and 2 is vulcanized and bonded to the inner cylinder 1. It is. Then, the other end surface side of both vibration isolating base portions 8 is vulcanized and bonded to a pair of opposing vertical walls 21 of the intermediate cylinder 16 that is press-contacted to the outer cylinder 1 and a pair of upper and lower ring portions 22 that are continuous with the vertical wall 21. It is. The pair of vertical walls 21 of the intermediate cylinder 16 are located slightly on the axial center side with respect to the ring portions 22. In addition, an opening is formed between the vertical walls 21 in the circumferential direction of the intermediate cylinder 16.
[0014]
The liquid chamber 4 is formed between a pair of opposing liquid chamber forming walls 10 made of a thin rubber-like elastic body between the anti-vibration base portions 8 in the circumferential direction of the inner and outer tubes 1 and 2. It is formed so as to cover from the outside in the direction. One end face side of the liquid chamber forming wall 10 in the radial direction of the inner and outer cylinders 1 and 2 is vulcanized and bonded to the inner cylinder 1 integrally with the vibration isolating base 3, and the other end face side is added to the pair of ring portions 22 of the intermediate cylinder 16. Sulfur bonded. Both end surfaces of the liquid chamber forming wall 10 in the circumferential direction of the inner and outer cylinders 1 and 2 are integrally connected to the vibration isolating base portion 8.
[0015]
The orifice 5 includes a pair of semi-ring-shaped orifice forming members 15 provided with one or two rows of orifice forming grooves along the circumferential direction on the outer peripheral portion, and the orifice forming grooves are formed on the back surface of the vertical wall 21 of the intermediate cylinder 16 and the outer cylinder. In a state of communicating with the space between the two vertical walls 21, the outer cylinder portion between the two vertical walls 21 is individually fitted inside. Reference numerals 17 and 18 denote openings of the orifice 5 with respect to the liquid chamber 4. The liquid flows into the liquid chamber 4 through the openings 17 and 18, or the liquid is discharged from the liquid chamber 4.
[0016]
In the manufacturing process of the present apparatus, the outer cylinder 2 is subjected to diameter reduction processing in a liquid while accommodating the intermediate cylinder 16 and the like, and both upper and lower ends are bent radially inward. As a result, the intermediate cylinder 16 is pressed against the outer cylinder 2 as described above, and the liquid is sealed in the liquid chamber 4.
[0017]
The stopper means 6 includes a spherical stopper portion 11 and a stoppered portion 12 that is recessed in a partial spherical shape so as to be distributed on the inner cylinder 1 side and the outer cylinder 2 side. Specifically, the inner cylinder portion 13 on the side corresponding to the liquid chamber 4 is swelled in a spherical shape, and is covered with a first covering portion 14 having a certain thickness made of a rubber-like elastic body to constitute a stopper portion 11. The stopper portion 12 is formed by denting the inner peripheral portion of the forming member 15 into a partial spherical shape.
[0018]
The outer peripheral part of the inner cylinder part outside the liquid chamber forming wall 10 is covered with a second covering part 20 made of a thin rubber-like elastic body. The anti-vibration base 3, the liquid chamber forming wall 10, the first covering portion 14, and the second covering portion 20 are integrally vulcanized. Therefore, they are connected together.
[0019]
With the above configuration, when vibration is input, the vibration-proof base 3 is elastically deformed and the inner cylinder 1 and the outer cylinder 2 are relatively displaced. Along with this, the volume of both liquid chambers 4 changes and the liquid flows through the orifice 5, so that an excellent vibration damping effect can be obtained due to the liquid flow effect such as resonance action.
[0020]
As shown in FIGS. 3 to 5, when the outer cylinder 2 is inclined with respect to the inner cylinder 1 and the position thereof is changed in the radial direction by the input of the vibration, the stopper portion 12 of the outer cylinder 2 is a rubber-like elastic body. The first covering portion 14 made of is crushed. In this case, since the stopper portion 11 is formed in a spherical shape and the stopper portion 12 is recessed in a partial spherical shape, the stopper surface and the surface to be stopped can be brought into surface contact (actually, the first crushed portion between the two). 1 covering portion 14 is interposed). As a result, the pressure contact force from the stopper portion 12 to the first covering portion 14 can be dispersed to avoid stress concentration, and damage to the first covering portion 14 can be prevented.
[0022]
In the above-described embodiment, the vertical type liquid-filled vibration isolator provided on the rear side of the pair of front and rear vibration isolator provided between the suspension member and the lower arm has been described as an example. The present invention can also be applied to a liquid-filled type vibration isolator provided in other than the above-described parts.
[0023]
【The invention's effect】
According to the present invention, it is possible to provide a liquid-filled vibration isolator capable of extending the life of the covering portion made of a rubber-like elastic body or the like provided on the stopper means.
[0024]
When the stopper portion is configured by expanding the inner cylinder portion on the side corresponding to the liquid chamber in a spherical shape and covering with a rubber-like elastic body, a structure in which a spherical ring member as a stopper member is externally fitted to the inner cylinder, etc. In comparison, the structure can be simplified.
[0025]
A ring-shaped orifice forming member having an orifice forming groove on the outer peripheral portion is fitted into the outer cylinder, and the stopper portion is formed by recessing the inner peripheral portion of the orifice forming member into a partial spherical shape. The structure can be simplified as compared with the case where the stopper portion is formed of a member.
[0026]
The anti-vibration base is composed of a pair of anti-vibration bases located between the inner cylinders, and a pair of opposing liquid chambers made of a rubber-like elastic body is formed between the two anti-vibration bases in the circumferential direction of the inner and outer cylinders. If the liquid chamber is formed by covering the inner and outer cylinders from the axially outer side with a wall, the structure can be simplified, and the liquid chamber can be reliably and securely associated with the relative displacement of the inner and outer cylinders. It can be smoothly deformed and vibration can be easily suppressed.
[Brief description of the drawings]
1 is a view of a liquid-filled vibration isolator as viewed from the axial direction. FIG. 2 is a longitudinal sectional view of the liquid-filled vibration isolator. FIG. 3 is a diagram showing a relative displacement between an inner cylinder and an outer cylinder. FIG. 5 shows the relative displacement between the inner cylinder and the outer cylinder. FIG. 5 shows the relative displacement between the inner cylinder and the outer cylinder. FIG. 6 shows the conventional liquid-filled vibration isolator as viewed from the axial direction. FIG. 8 is a longitudinal sectional view of a conventional liquid-filled vibration isolator. FIG. 8 is a diagram showing a relative displacement between a conventional inner cylinder and an outer cylinder. FIG. 9 is a diagram showing a relative displacement between a conventional inner cylinder and an outer cylinder. ] Diagram showing relative displacement between conventional inner and outer cylinders [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Anti-vibration base | substrate 4 Liquid chamber 5 Orifice 6 Stopper means 10 Liquid chamber formation wall 11 Stopper part 12 Stopper part 13 Inner cylinder part 15 Orifice formation member

Claims (3)

An anti-vibration base made of a rubber-like elastic body is interposed between the inner cylinder and the outer cylinder, and a pair of liquid chambers located between the inner cylinder and the outer cylinder with the inner cylinder sandwiched between the inner cylinder and the outer cylinder. Liquid-filled vibration proofing provided with stoppers that are provided so as to be deformable in accordance with the relative displacement of the cylinder, form an orifice that communicates both liquid chambers, and suppress the relative displacement between the inner cylinder and the outer cylinder within a predetermined range. A device,
The stopper means includes a stopper portion of the spherical, Ri and the stopper portion recessed partially spherical constructed by distributing disposed within said cylinder side and the outer tube side Thea,
The stopper portion is configured to bulge the inner cylinder portion on the side corresponding to the liquid chamber in a spherical shape and to cover the outer peripheral surface of the spherical inner cylinder portion with a covering portion having a certain thickness made of a rubber-like elastic body. And
The stopper portion is a liquid formed by fitting a ring-shaped orifice forming member having an orifice forming groove on the outer peripheral portion thereof into the outer cylinder, and recessing the inner peripheral portion of the orifice forming member into a partial spherical shape. Enclosed vibration isolator. The anti-vibration base comprises a pair of anti-vibration bases located between the inner cylinders, and the liquid chamber comprises a pair of rubber-like elastic bodies between the anti-vibration bases in the circumferential direction of the inner and outer cylinders. The liquid-filled vibration isolator according to claim 1 , wherein the liquid-filled vibration isolating device is formed so as to cover from the outer side in the axial direction of the inner and outer cylinders with the opposing liquid chamber forming walls. The liquid-filled vibration isolator according to claim 1 or 2, wherein the liquid-filled vibration isolator is a vertically-installed liquid-filled vibration isolator having an axial center provided vertically between a front suspension member and a lower arm of an automobile.

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