JP2002340080A - Liquid filing type mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid filing type mount giving a vibration isolating property for the X-direction perpendicularly intersecting the loading direction and assuring enhancement of the durability of a resilient member 3 when an X-direction vibration is applied. SOLUTION: At the inside surface of a mount case 1 as a first mounting member, a stopper 6 is installed positioned at the periphery of a boss 2 as a second mounting member. The stopper 6 is formed ring-shapedly from a resilient rubber material having a high damping coefficient, and a clearance δ1 is reserved between the inside surface 6a and the peripheral surface of the boss 2. The stopper 6 has a tapered concave surface 6b so that its wall thickness reduces toward the inside surface and confronts the resilient member 3 with a clearance δ2 between. Therefore, if the amplitude of vibration in the X- direction becomes over the clearance δ1, the peripheral surface of the boss 2 abuts to the inside surface 6a of the stopper 6 to cause its deformation, and a vibration isolating effect is generated and the resilient member 3 is prevented from an excessive deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration technique, and is used, for example, as an anti-vibration support means for an automobile engine or the like, and uses a liquid resonance to reduce a dynamic spring constant by utilizing liquid resonance. About the expression mount.

[0002]

2. Description of the Related Art An automobile engine is elastically supported by a vehicle body via a vibration-proof mount in order to minimize the transmission of vibrations to the vehicle body. There is a liquid-filled mount that utilizes the flow resistance of a liquid in a flow path for vibration damping and reduces the dynamic spring constant by using the resonance of the liquid.

FIG. 3 is a cross-sectional view of a typical example of a conventional liquid-filled mount cut along a plane passing through an axis. That is, the liquid-filled mount according to the related art includes a mount case 101 mounted on the vehicle body frame side via mounting bolts 102, and a boss 103 arranged on the inner periphery of the upper portion and connected to the engine side via mounting bolts 104. And the mounting case 101 and the boss 10
An elastic body 105 made of a rubber-like elastic material which is provided integrally with the elastic member 3 and is continuous in a substantially conical shape in which the inner peripheral side is higher;
A diaphragm 106 made of a rubber-like elastic material and sealed below the elastic body 105 on the inner periphery of the mount case 101, and fixed to the inner periphery of the mount case 101 between the elastic body 105 and the diaphragm 106. Partition 107
And

The partition 107 is provided so as to partition the sealed space between the elastic body 105 and the diaphragm 106 into a first liquid chamber A on the elastic body 105 side and a second liquid chamber B on the diaphragm 106 side. A sub-diaphragm 108 is provided on the inner periphery. The first liquid chamber A and the second liquid chamber B are separated by a partition 10.
The first liquid chamber A, the second liquid chamber B, and the orifice C are filled with a working liquid having an appropriate viscosity through an orifice C formed at 7.

[0005] The liquid-filled mount is mounted on the orifice C in the Y direction (axial direction) parallel to the direction of the load of the engine, which is a supported body, by a shock such as a bouncing of the vehicle body. When a displacement with a large frequency is input, the first liquid chamber A, which undergoes a volume change forcibly due to the displacement of the elastic body 105, and the second liquid chamber B, whose volume change is allowed by the diaphragm 106, The working liquid repeatedly moves through the orifice C due to the liquid column resonance in the orifice C, and absorbs a change in the liquid pressure in the first liquid chamber A due to the vertical repetitive deformation of the elastic body 105. As a result, the dynamic spring constant is reduced to effectively insulate the transmission of vibration, and at the same time, the loss coefficient of vibration energy due to the flow resistance is increased. I do.

The input vibration in the Y direction is caused by the orifice C
In the case of continuous small-amplitude vibration in the middle and high frequency range due to engine vibration of the engine having a higher frequency than the liquid column resonance frequency in the inside, the working liquid does not flow through the orifice C, but the elastic body 105 is repeatedly deformed up and down Since the change in the liquid pressure of the first liquid chamber A accompanying this is absorbed by the deformation of the sub-diaphragm 108 in the thickness direction, the dynamic spring constant is reduced, and excellent vibration insulation is exhibited.

[0007]

However, in the above-described liquid-filled mount according to the prior art, the vibration damping effect and the vibration isolation described above are not applied to the vibration input in the Y direction parallel to the load of the engine. Although it is effective, for vibration input of the X direction component orthogonal to the direction of the load,
No remarkable anti-vibration effect was obtained. In addition, when the amplitude in the X direction increases, the deformation of the elastic body 105 between the mount case 101 and the boss 103, which are eccentrically moved, increases, and the durability thereof may be impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its technical object to provide a vibration-proof performance in a direction perpendicular to the direction of a load, and to provide an elastic body at the time of vibration input. To improve the durability of the device.

[0009]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the liquid-filled mount according to the invention of claim 1 is provided integrally with the first mounting member and the second mounting member disposed on the inner periphery thereof, and between the first mounting member and the second mounting member. And an elastic body which is continuous in a substantially conical shape whose inner peripheral side is higher, a diaphragm sealed to the inner periphery of the first attaching member, and a first elastic member fixed to the inner periphery of the first attaching member, A partition interposed between the liquid chamber and the second liquid chamber on the diaphragm side and provided with an orifice for communicating the first liquid chamber and the second liquid chamber with each other, and disposed on the outer peripheral side of the second mounting member. And a stopper fixed to the first mounting member side.

According to a second aspect of the present invention, in the liquid-filled mount according to the first aspect of the present invention, the second mounting member and the stopper are radially opposed via a clearance, and the elastic body and the stopper are axially connected via the clearance. Characterized in that they face each other. Here, the axial direction substantially coincides with the direction in which the supported load acts, and the radial direction substantially coincides with the direction orthogonal to the direction in which the supported load acts.

According to a third aspect of the present invention, in the liquid-filled mount according to the first or second aspect, the stopper is made of a rubber-like elastic material.

According to a fourth aspect of the present invention, in the liquid-filled mount according to the third aspect of the present invention, the stopper has a shape that is thinner toward the inner peripheral side.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid-filled mount according to the present invention will be described below with reference to FIGS. First, FIG. 1 is a longitudinal sectional view showing a liquid-filled mount according to the first embodiment. The direction indicated by Y in the drawing is the direction in which the load of the engine as the supported body acts, that is, the vertical direction (axial direction), and the direction indicated by X in the drawing is the direction in which the load acts. The direction is orthogonal, that is, the lateral direction (radial direction).

In this liquid-filled mount, reference numeral 1 denotes a mounting case as a first mounting member, which is not shown via mounting bolts 11 which are mounted on the vehicle body frame side via a bracket or the like not shown. A metal cup member 12 attached to the body frame side and a metal outer cylinder 13 above the metal cup member 12 have a structure in which they are connected to each other by caulking. The cup member 12 has a ventilation hole 12a.

Reference numeral 2 denotes a metal boss as a second mounting member concentrically disposed on the upper inner periphery of the mount case 1, and is provided integrally with the main body 21 at the upper end thereof to be supported. Mounting bolt 2 connected to the engine, which is the body
2 is provided.

The body 21 of the boss 2 and the mount case 1
An elastic body 3 formed of a rubber-like elastic material and formed in a conical annular shape whose inner peripheral side is raised toward the outside (upward) is integrally joined to the inner peripheral surface of the outer cylinder 13. This elastic body 3
Is a main body that elastically supports a load on the engine side, which is a supported body, and thus has a sufficiently large thickness. An elastic film portion 3 a extending from the outer peripheral end of the elastic body 3 covers the inner surface of the outer cylinder 13 of the mount case 1.

The cup member 12 in the mount case 1
A diaphragm 4 made of a rubber-like elastic material and a partition wall 5 disposed above the diaphragm 4 are fixed to the caulked portion 1a of the outer tube 13 and the outer tube 13. The diaphragm 4 is formed sufficiently thinner than the elastic body 3 and has a wavy cross-sectional shape so as to be easily displaceable.
The outer peripheral flange portion 12b of the cup member 12 in the mount case 1 is hermetically sandwiched between the outer peripheral portion of the lower surface of the partition wall 5 and the outer peripheral portions of the partition wall 5 and the cup member 12 and the caulked portion of the outer cylinder 13. Is sealed by the elastic film portion 3a.

The partition 5 is arranged so as to partition the sealed space between the elastic body 3 and the diaphragm 4 into a first liquid chamber A on the elastic body 3 side and a second liquid chamber B on the diaphragm 4 side. ,
An annular first plate 51 and a second plate 52 whose outer peripheral portions are clamped and fixed to the caulking portion 1a of the mount case 1 in a state of being overlapped with the diaphragm 4 in the axial direction.
And a sub-diaphragm 53 made of a rubber-like elastic material sealed on its inner periphery.

An orifice C having an end in the circumferential direction is formed between the opposing surfaces of the first plate 51 and the second plate 52 in the partition wall 5.
One end is provided with an opening 5 formed in the first plate 51.
1a, it is opened to the first liquid chamber A, and the other end is opened to the second liquid chamber B through an opening 52a opened in the second plate 52. Therefore, the first liquid chamber A and the second liquid chamber B communicate with each other via the orifice C.

First liquid chamber A, second liquid chamber B and orifice C
Is filled with an incompressible working liquid having an appropriate viscosity, such as silicone oil. The orifice C extends long in the circumferential direction, so that the liquid column resonance frequency of the working liquid existing inside the orifice C is low so that it substantially matches the frequency of vibration due to shock input such as bouncing of the vehicle body. The frequency range is set. When the working liquid flows at a high speed in the narrow and long flow path formed by the orifice C, an effective damping force is generated by viscous resistance. The sub-diaphragm 53 provided on the inner periphery of the partition 5 has an area from the first liquid chamber A sufficiently larger than the cross-sectional area of the orifice C.

At the lower end of the boss 2, a stirring plate 23 having a circular dish shape projected in the Y direction is attached. The stirring plate 23 is located in the first liquid chamber A. .
In the illustrated normal state in which only the load of the engine is applied to the elastic body 3 via the boss 2, a required gap is formed between the stirring plate 23 and the inner surface of the elastic body 3.

The upper portion 13a of the outer cylinder 13 in the mount case 1 extends above the bonding portion with the outer peripheral end of the elastic body 3, and the inner periphery thereof has the main body portion 21 of the boss 2 attached thereto.
An annular stopper 6 is provided so as to surround the outer peripheral surface of.

The stopper 6 is formed of a rubber-like elastic material having a high damping property, and its outer peripheral surface is press-fitted or adhered to the inner peripheral surface of the upper portion 13a of the outer cylinder 13 in the mount case 1, and A clearance δ1 is formed between the surface 6a and the outer peripheral surface of the boss body 21. The inner peripheral portion of the lower surface of the stopper 6 is a tapered concave surface 6b substantially corresponding to the tapered upper surface 3b of the elastic body 3 whose inner peripheral side is higher, and the tapered upper surface 3b is formed via a clearance δ2.
b.

On the upper surface of the stopper 6, a metal retaining ring 6 is provided.
1 is arranged. The inner diameter of the retaining ring 61 is appropriately larger than the inner diameter of the stopper 6, and the outer cylindrical portion is
The mounting case 1 is fixed to the outer peripheral surface of the upper end of the outer cylinder 13 by an appropriate method such as press fitting, welding, or screwing.

The working liquid in the closed space formed by the first liquid chamber A, the second liquid chamber B, and the main orifice C connecting the first liquid chamber A and the second liquid chamber B is formed by the elastic body 3, the boss 2, the stirring plate 23, and the outer cylinder 13. A part of the liquid is sealed when assembling the liquid-sealed mount by bonding the sulfur molded body, the diaphragm 4, the orifice member 5, and the cup member 12 in a liquid tank such as silicone oil. It is.

According to the liquid-filled mount of this embodiment, when vibration is input between the body frame side and the engine side in the direction of load (Y direction), the mount case 1 and the boss 2
Are repeatedly displaced relative to each other in the Y direction, so that the elastic body 3 undergoes repeated deformation between the two. When the input vibration is a large-amplitude vibration in a low-frequency range that causes a large change in hydraulic pressure in the first liquid chamber A, such as a bounce when the vehicle is running, the liquid column resonance frequency in the orifice C But,
Since it is set in the frequency range of such input vibration,
The working liquid is repeatedly moved in the orifice C toward the relatively low pressure side of the first liquid chamber A and the second liquid chamber B by the liquid column resonance while the diaphragm 4 is being displaced. Therefore, at this time, a high damping is generated due to the flow resistance in the orifice C, and a good damping property is obtained, and the relative repeated displacement of the mount case 1 and the boss 2 due to the input vibration is suppressed in a short time.

When the input vibration in the Y direction is a continuous vibration in the middle / high frequency range due to, for example, engine vibration of the engine, the working liquid in the orifice C has a large liquid column inertia. Although it does not flow, the hydraulic pressure change of the first liquid chamber A due to the elastic body 3 being repeatedly deformed in the Y direction is as follows.
The sub-diaphragm 53 provided on the inner periphery of the partition wall 5 is effectively absorbed by expansion deformation in the thickness direction. For this reason, the dynamic spring constant is reduced, and the transmission of vibration in the middle and high frequency regions can be effectively insulated.

The stirring plate 23 in the first liquid chamber A is vibrated and displaced integrally with the boss 2. Therefore, in the input of the vibration displacement in the Y direction as described above, the gap G between the elastic body 3 and the stirring plate 23 is repeatedly changed, and the working liquid existing there is repeatedly moved in the radial direction. Generates damping force. Then, when the frequency of the input vibration becomes a predetermined frequency, the working liquid in the gap G smoothly and repeatedly moves by the liquid column resonance, whereby the dynamic spring is lowered, and the transmission of vibration around this frequency is insulated. it can.

Since the required clearance δ2 is formed between the elastic body 3 and the stopper 6, the above-described deformation of the elastic body 3 in the Y direction is not hindered by the stopper 6. When the boss 2 is relatively displaced upward due to rebound or the like, the tapered upper surface 3 of the elastic body 3 is set when the displacement reaches a predetermined amount.
b elastically contacts the tapered concave surface 6b of the stopper 6. For this reason, the upward displacement of the boss 2 is limited, and excessive deformation of the elastic body 3 is prevented.

When vibration in the X-direction component orthogonal to the direction of the load is input, the mount case 1 and the boss 2 undergo relative vibration displacement so as to be eccentric to each other. When the vibration is small amplitude within the range of the clearance δ1, only the elastic body 3 is deformed. However, when the amplitude in the X direction becomes larger than the clearance δ1, the main body 2 of the boss 2 is deformed.
The outer peripheral surface of the stopper 1 comes into contact with the inner peripheral surface 6a of the stopper 6, and the stopper 6 is deformed. As a result, a high attenuation is generated due to the internal friction, and the vibration-proof effect is exhibited.

Here, the stopper 6 has a tapered concave surface 6b.
Is formed, the inner peripheral side becomes thinner and has lower rigidity, so that the boss 2 has a low spring at the initial stage of compression due to contact with the main body portion 21, and the larger the compression amount, that is, the more the boss 2 The spring constant increases as the relative displacement in the X direction increases. Therefore, while exhibiting an excellent buffering function due to such non-linearity, the relative displacement of the boss 2 in the X direction is limited, thereby preventing the elastic body 3 from being excessively deformed.

When the relative displacement of the boss 2 in the X direction is further increased, the outer peripheral surface of the main body 21 in the boss 2 comes into contact with the inner peripheral edge of the metal retaining ring 61. The relative displacement is suppressed, and the elastic body 3 and the stopper 6 are prevented from being damaged by excessive deformation.

FIG. 2 is a longitudinal sectional view showing a liquid-filled mount according to a second embodiment of the present invention.
The liquid-filled mount of the present embodiment differs from the first embodiment shown in FIG. 1 in the structure of the stopper 6.

That is, in this embodiment, the stopper 6
Is formed of an inner ring 62 made of a rubber-like elastic material and an outer ring 63 made of a metal or synthetic resin material. Inner ring 62
Is integrally joined to the inner peripheral surface of the outer ring 63 by bonding or integral molding. The outer ring 63 has its outer peripheral surface press-fitted or adhered to the inner peripheral surface of the upper part 13 a of the outer cylinder 13 in the mount case 1. I have. The inner diameter of the outer ring 63 is substantially equal to the inner diameter of the retaining ring 61.

The inner peripheral surface 62 of the inner ring 62 in the stopper 6
a between the boss body 21 and the outer peripheral surface of the boss body 21.
1 is formed. The lower surface of the inner ring 62 is a tapered concave surface 62b substantially corresponding to the tapered upper surface 3b of the elastic body 3 whose inner peripheral side is higher, and vertically faces the tapered upper surface 3b via a clearance δ2. .

The construction of the other parts is basically similar to that of the first embodiment shown in FIG.

According to the liquid-filled mount of this embodiment, Y
The operation for the input vibration in the direction is substantially the same as that of the first embodiment shown.

When the mount case 1 and the boss 2 are subjected to relative vibration displacement so as to be eccentric to each other due to the input of the vibration in the X direction, the clearance δ1
In the small-amplitude vibration within the range, only the elastic body 3 is deformed, but when the clearance δ1 or more is exceeded, the outer peripheral surface of the main body 21 of the boss 2
When the inner ring 62 is deformed by contacting the inner peripheral surface 62a of the second member 2, a high damping due to the internal friction is generated, and the vibration damping effect is exhibited.

Here, since the inner ring 62 constituting the inner peripheral portion of the stopper 6 is thinner and less rigid toward the inner peripheral side by the tapered concave surface 62b, the inner ring 62 is compressed by the contact of the boss 2 with the main body portion 21. The spring is initially low, and the spring constant increases as the compression amount increases, that is, as the X-direction relative displacement amount of the boss 2 increases. Moreover, the stopper 6
Since the outer ring 63 constituting the outer peripheral portion is made of a metal or a synthetic resin, the rate of increase in the spring constant is greater than in the first embodiment in which the entire stopper 6 is made of a rubber-like elastic material. Therefore, the function of limiting the relative displacement of the boss 2 in the X direction can be enhanced.

When the function of the stopper 6 is limited to preventing the elastic body 3 from being excessively deformed, the entire stopper 6 may be made of metal or synthetic resin having high rigidity.

[0041]

According to the liquid-filled mount according to the first aspect of the present invention, since the stopper fixed to the first mounting member is disposed on the outer peripheral side of the second mounting member, the supported load is reduced. When vibration is input in a direction perpendicular to the direction of action, the relative displacement between the first mounting member and the second mounting member in this direction is limited to within a predetermined amount of displacement, so that excessive deformation of the elastic body is prevented and its durability is reduced. Can be enhanced.

According to the liquid-filled mount according to the second aspect of the present invention, since a required clearance is formed between the second mounting member and the stopper and between the elastic body and the stopper, the elastic body is formed by vibration input. The vibration absorbing operation is not hindered by the stopper, and the stopper has a displacement limiting function for a predetermined amplitude or more.

According to the liquid-filled mount according to the third aspect of the present invention, since the stopper is made of a rubber-like elastic material, the second mounting member is moved by a vibration input in a direction perpendicular to the direction in which the supported load acts. When the stopper comes into contact with the stopper and undergoes deformation, high damping occurs due to internal friction of the stopper, and an anti-vibration effect is exerted in a direction perpendicular to the direction in which the supported load acts.

According to the liquid-filled mount according to the fourth aspect of the present invention, since the stopper has a shape that becomes thinner toward the inner peripheral side, the spring is low in the initial stage of compression due to contact with the second mounting member, and the compression is reduced. It has nonlinearity such that the spring constant increases as the amount increases. Therefore, while exhibiting an excellent cushioning function, the greater the relative displacement of the second mounting member in the direction orthogonal to the direction of action of the supported load, the greater the limiting force for this displacement, thereby causing excessive deformation of the elastic body. Can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a liquid-filled mount according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a liquid-filled mount according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a typical example of a liquid-filled mount according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mount case (1st mounting member) 2 Boss (2nd mounting member) 3 Elastic body 4 Diaphragm 5 Partition wall 53 Subdiaphragm 6 Stopper 6a, 62a Inner peripheral surface 6b, 62b Tapered concave surface 61 Suppression ring 62 Inner ring 63 Outer ring A First liquid chamber B Second liquid chamber C Orifice δ1, δ2 Clearance

Claims (4)

[Claims] 1. A first mounting member (1) and a second mounting member (2) disposed on an inner periphery thereof, and an integral part between the first mounting member (1) and the second mounting member (2). An elastic body (3) continuously provided in a substantially conical shape, the inner peripheral side of which is high, a diaphragm (4) sealed on the inner periphery of the first mounting member (1), and the first mounting member ( The first liquid is interposed between a first liquid chamber (A) on the elastic body (3) side and a second liquid chamber (B) on the diaphragm (4) side and fixed to the inner periphery of 1). A partition (5) provided with an orifice (C) for communicating the chamber (A) and the second liquid chamber (B) with each other, and the first mounting member ( (1) A liquid-filled mount comprising: a stopper (6) fixed to a side. 2. The second mounting member (2) and the stopper (6) radially oppose each other via a clearance (δ1), and the elastic body (3) and the stopper (6) are connected to each other via a clearance (δ2). 2. The liquid-filled mount according to claim 1, wherein the mount is opposed in a direction. 3. The liquid-filled mount according to claim 1, wherein the stopper is made of a rubber-like elastic material. 4. The liquid-filled mount according to claim 3, wherein the stopper has a shape that becomes thinner toward the inner peripheral side.