JP2002257183A - Liquid-sealed body mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a liquid-sealed body mount in which a stopper provided in a liquid chamber is capable of performing effective stopping operation with high rigidity and also improving durability. SOLUTION: The liquid-sealed body mount is comprised of an inner tube 1, an outer tube 2, a rubber elastic body 3 arranged between the inner tube 1 and outer tube 2, two liquid chambers 4a and 4b opposing each other by holding the inner tube 1 between them, and an orifice passage 6 connecting both liquid chambers. A stopper 7 in which a metal portion 71 extended from the inner tube 1 to a radial direction is buried in a rubber portion 72 integrated with the rubber elastic body is arranged in the inside of both the liquid chamber 4a and 4b. The pointed end surface of the stopper is formed in a projected state so as to have little clearance against the surface of the internal wall of the liquid chamber toward an outer peripheral side or so as to slightly touch with the internal wall of the liquid chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled body mount interposed between a body of a vehicle and a supporting frame such as a suspension to support the body in a vibration-proof manner.

[0002]

2. Description of the Related Art Conventionally, a body mount used for a rear suspension or the like of a vehicle such as an automobile has been connected and fixed to one of a vehicle body and a suspension-side frame supporting the body. Inner cylinder and an outer cylinder connected and fixed to the other, and these inner and outer cylinders are connected by a rubber elastic body disposed therebetween, and the inner and outer cylinders are further opposed to each other with the inner cylinder interposed therebetween. It is known that two liquid chambers formed between the two liquid chambers are provided, and these two liquid chambers are communicated with each other through an orifice passage so as to obtain an effect of vibration damping by a liquid flow effect of the two liquid chambers (for example, JP-A-2-38730 and JP-A-62-188832.

When a mount having such a structure is used with the liquid chamber positioned in the front-rear direction of the vehicle, there is an effect of lowering the dynamic spring constant in the vertical direction where the load of the body is received, and the mount is somewhat stable. Although it can exhibit anti-vibration characteristics,
The rigidity of the rubber portion of the end wall of the liquid chamber acts in the front-rear direction in which a large vibration acts during acceleration or braking such as when the vehicle starts, and the effect of suppressing the vibration is reduced. When the coefficient is set to about 4 N · s / mm, the dynamic spring constant around 100 Hz is 2000 N / m.
m or more, so that a sufficient vibration-proof function does not work, and further improvement is desired.

The present invention has been made in view of the above, and as a body mount of this type, a damping coefficient having a frequency of 15 Hz, for example, of 4N is mainly applied to vibration in the front-rear direction.
The object of the present invention is to provide a liquid-filled body mount capable of reducing the dynamic spring constant at about 100 Hz to about 1000 N / mm at about s / mm and obtaining sufficient vibration isolation characteristics.

[0005]

SUMMARY OF THE INVENTION The present invention is a liquid-filled body mount interposed between a vehicle body and a supporting frame to support the body in a vibration-proof manner. An inner cylinder fixed to one of the side frames; an outer cylinder fixed to the other frame; a rubber elastic body interposed between the inner and outer cylinders to elastically connect the two cylinders; A body having two liquid chambers formed between the inner and outer cylinders at portions opposed to each other with the inner cylinder interposed therebetween, and an orifice passage communicating the two liquid chambers, wherein the load input of the body is in the axial direction In the mount, the end walls in the axial direction of the two liquid chambers are formed by a part of the rubber film of the rubber elastic body, and the rubber film is inclined from the inner cylinder side to the outer cylinder in the axially outward direction. It is characterized by doing.

According to this body mount, when a vibration force is applied in a direction perpendicular to the axis in the direction opposite to the two liquid chambers, the rubber film forming the axial end walls of the two liquid chambers is inclined. Therefore, the vibration can be effectively attenuated by the action of the rubber film. For example, at a frequency of 15 Hz, the vibration coefficient is set to about 4 N · s / mm, and the dynamic spring constant is set to about 1000 N / mm. Can be lowered. Therefore, by using the body mount with the liquid chamber positioned in the front-rear direction of the vehicle, it is possible to exhibit good vibration proof characteristics against vibration in the front-rear direction or in the oblique front-rear direction.

In the above body mount, the angle of inclination of the end wall with respect to the axis of the rubber film is 15 ° to 70 °.
Are particularly preferred.

That is, even if the inclination angle is larger or smaller than the above range, the rigidity balance in the axial direction and the axial direction is lost, and the vibration transmission in each direction is adversely affected. Preferably, the angle is in the range of 30 ° to 60 °.

In the above liquid-filled body mount,
The end wall formed by the rubber film may extend in a substantially wavy shape in the radial direction from the inner cylinder side, and may have an expanded shape extending outward in the axial direction toward the outer cylinder side. In this case, the dynamic spring constant can be reduced in the same manner as described above, and the durability is improved by extending the free length of the rubber film.

The thickness of the end wall formed by the rubber film is 2 to 2.
It is preferably 6 mm. That is, when the thickness of the rubber film on the end wall is small, the transmission efficiency of the pressure of the liquid is reduced, and it is difficult to obtain the liquid sealing effect. On the other hand, if the rubber film is too thick, the rigidity of the rubber portion is increased, and the amount of vibration transmission to the liquid pressure is reduced, so that the effect of liquid sealing is hardly obtained.

Further, it is preferable that the both liquid chambers have a stopper radially projecting from the inner cylinder.
As a result, a large displacement exceeding a certain value can be prevented.

It is particularly preferable that the stopper is formed by embedding a metal portion fixed to the inner cylinder in a rubber portion integral with a rubber elastic body, since the impact can be reduced when the stopper acts.

The circumferential opening angle of the liquid chamber is not less than 60 ° and not more than 140 ° from the viewpoint that the area of the axial end wall formed by the rubber film can be increased and the durability can be improved. Are particularly preferred.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view taken along the line XY of FIG. 2 showing a first embodiment of the body mount of the present invention, and FIG.
1 is a cross-sectional view taken along line 1-X1, FIG. 3 is a partially cutaway side view of the same outer cylinder, FIG. 4 is a longitudinal side view excluding the outer cylinder, and FIG. FIG. 6 is a sectional view of FIG.
FIG. 7 is a cross-sectional view taken along the line X3, and FIG.

In the drawing, (1) is an inner cylinder which is connected and fixed to a vehicle body via a body-side mounting member (100), and has a relatively thick cylindrical shape. (100) is fastened and fixed by a fastening member (101) such as a bolt. (2) an outer cylinder which is mounted and fixed to the annular mounting member (103) of the frame (102) on the supporting side such as a suspension supporting the body by a press-fitting means or the like via a rubber layer (104); It is arranged substantially concentrically with the inner cylinder (1). These inner and outer cylinders (1) and (2) are usually made of metal such as aluminum or steel.

(3) is a rubber elastic body disposed between the inner cylinder (1) and the outer cylinder (2). Two liquid chambers (4a) formed between the inner and outer cylinders (1) and (2) at the portions (symmetrical positions) of the rubber elastic body (3) opposed to each other across the inner cylinder (1) and open to the outer periphery. ) And (4b), and these two liquid chambers (4a) and (4b) are connected to orifice passages (6) described later.
It is communicated by.

The rubber elastic body (3) has an inner periphery which is vulcanized and bonded to the inner cylinder (1), and an outer cylinder which is fitted inside the outer cylinder (2). (5) is vulcanized and adhered. The intermediate tube (5) has an outward flange portion (51) on the lower end side and the liquid chambers (4).
a) Windows (5a) and (5b) have openings corresponding to (4b). A rubber layer (31) for sealing integrated with the rubber elastic body (3) is provided on the outer peripheral surface of the intermediate cylinder (5), and a convex rib is provided on a part of the rubber layer (31). (32)
The intermediate cylinder (5) is provided with the outer cylinder (2).
The rubber elastic body (3) is hermetically fitted through the rubber layer (31) and the ridge rib (32) inside the rubber elastic body (3).
Are disposed between the inner and outer cylinders (1) and (2), and the liquid chambers (4a) and (4b) in which liquid is sealed are formed. The outer cylinder (2) has a flange (21) at the lower end thereof caulked and fixed to the flange (51) of the intermediate cylinder (5) in the fitted state.

Further, a groove (6a) in the circumferential direction extending between the openings (5a) and (5b) is provided on the outer peripheral portion of the intermediate cylinder (5), and the outer cylinder (2) is provided outside the intermediate cylinder (5). ) Is fitted to form the concave groove (6a) as an orifice passage (6) connecting the two liquid chambers (4a) and (4b).

The opening angle (θ) of the two liquid chambers (4a) and (4b) in the circumferential direction, that is, the opening angle (θ) of the liquid chamber defined by the openings (5a) and (5b) of the intermediate cylinder is a characteristic. Can be set to any angle depending on
° is set to the following range. Incidentally, in this embodiment, the opening angle (θ) is set to approximately 70 °. From the viewpoint of durability and the like, the angle is preferably 80 ° or more as described later.

A stopper (7) protrudes radially from the inner cylinder (1) in the liquid chambers (4a) and (4b). When a large displacement occurs in the protrusion direction of the stopper (7), The inner wall of the outer cylinder (2) is in contact with the inner wall surface of the outer cylinder (2) to restrict further displacement. The stopper (7) is formed such that its front end surface has a slight gap with respect to the chamber wall surface on the outer peripheral side of the liquid chamber, or is formed so as to protrude to such a degree that it comes into light contact with the liquid chamber. Is set to, for example, about 1 mm or smaller. For example, the distal end surface may be slightly in contact with the chamber wall surface. Further, the gap between the front end surface and the chamber wall surface also has an effect of giving a liquid flow resistance when vibrating in the vertical direction (axial direction).

The stopper (7) usually has a metal part (71) fixed to the inner cylinder (1) embedded in a rubber part (72) integral with the rubber elastic body (3) as shown in the figure. That is, it is formed so that the contact with the chamber wall surface is performed elastically.
The stopper (7) has a width in the circumferential direction,
By setting a large value including 1), excessive bending deformation can be suppressed, and durability can be improved.

In the body mount having the above-described structure, both end walls (40a) (41a), (40b) and (41b) of the two liquid chambers (4a) and (4b) in the axial direction are formed by the rubber elastic body ( 3) is formed of a rubber film having a required thickness integral with the rubber film, and the rubber film extends substantially linearly from the inner cylinder (1) toward the outer cylinder (2) in an obliquely outward direction in the axial direction. The liquid chambers (4a) and (4b) as a whole have a substantially Y-shaped vertical cross section on the outer peripheral side.

Both end walls (40a) (41a) of the rubber film,
(40b) The inclination angle of (41b) with respect to the axis is 15 ° to 7 °.
0 °, particularly preferably in the range of 30 ° to 60 °. Further, both end walls (40a) (41a) of the rubber film,
(40b) The thickness of (41b) is in the range of 2 to 6 mm.

The axial end faces of the rubber elastic body (3) between the liquid chambers (4a) and (4b) are end walls (40a) (41a) and (40b) made of the rubber film. It is not limited to the same linear or corrugated inclined surface as the outer surface of (41b). In particular, the axial end surface of the lower rubber elastic body (3) is shown in FIG.
As described in the above, the end walls (41a) and (41b) can be recessed so as to form a reverse inclined surface. (33a) shows the concave portion.

Further, a stopper rubber (81) integral with the rubber elastic body (3) is attached to the lower surface of the flange portion (51) of the intermediate cylinder (5) by vulcanization bonding means, and the vibration is accompanied by the vibration of the body. When the inner cylinder (1) is largely displaced upward, the engagement plate (82) fixed to the lower end of the inner cylinder (1) elastically abuts and engages, thereby restricting a certain displacement or more. It is provided in. In the mounting state shown in FIG. 1, a stopper member (85) provided with a stopper rubber (84) on a ring fitting (83) is provided on the inner cylinder (1) above the mounting member (103) of the frame (102). When the body is displaced downward, the lower surface of the mounting member (100) is elastically brought into contact with the body, thereby restricting the displacement to a certain value or more.

The liquid-filled body mount of the present invention having the above-described structure is used in a rear suspension or the like of a vehicle such as an automobile, as shown in FIG. The outer cylinder (2) is press-fitted and fixed to an annular mounting member (103) of a suspension frame (102) for use with a fastening member (101) such as a bolt. In particular, at this time, the two liquid chambers (4a) and (4b) are mounted and used so as to be positioned in the front-rear direction of the vehicle.

This body mount not only reduces the dynamic spring constant in the vertical direction of receiving the load of the body in the above-mentioned use, but also is perpendicular to the axis at which a large vibration is applied during acceleration or braking when starting the vehicle. Also in the front-rear direction and the oblique front-rear direction, the rubber films forming the both end walls (40a) (41a), (40b) and (41b) in the axial direction of the liquid chambers (4a) and (4b) are inclined. Therefore, the rigidity and elastic force against the vibration in the above-described direction become weaker than in the case of a rubber film perpendicular to the axis, and the dynamic spring constant is reduced by the effect of this rubber film, which is a factor of the two liquid chambers (4a). The vibration damping effect is enhanced in combination with the liquid flow effect during (4b).

For example, when the frequency is 15 Hz, the damping coefficient can be set to about 4 N · s / mm, and the dynamic spring constant at about 100 Hz can be reduced to about 1000 N / mm. As a result, it is possible to exhibit good vibration damping characteristics against vibration in the front-rear direction or in the oblique front-rear direction.

FIGS. 8 to 10 show a second embodiment of the present invention. The basic configuration of the second embodiment is the same as that of the above-described embodiment, and the same components are denoted by the same reference numerals. Detailed description is omitted.

In this embodiment, two liquid chambers (4a) and (4b) opposed to each other across the inner cylinder (1) of the rubber elastic body (3).
Axial end walls (40a) (41a), (40b) (41b)
The inner cylinder (1) alternately extends in the radial direction in the radial direction from the side of the inner cylinder (1) in a substantially wavy shape due to the continuation of the curved surface of the inverted round, and the outer cylinder (2) has an expanded shape extending outward in the axial direction. In this case, the inclination angle formed by the straight line connecting the connecting points of the inner cylinder (1) and the outer cylinder (2) of each of the end walls (40a) (41a), (40b) (41b) with respect to the axis is: It is preferable to form the same angle range as in the first embodiment. The same applies to the wall thickness.

As in this embodiment, both end walls (40a) (41
When a), (40b), and (41b) have a substantially corrugated shape, they form an end wall unlike linear or slightly curved and obliquely extending as shown in FIGS. By extending the free length of the rubber film, the stress at the time of bending deformation can be reduced, and the durability is improved.

In the case of the embodiment shown in FIGS.
The circumferential opening angle (θ) of the two liquid chambers (4a) and (4b) is
As shown in the figure, it is set to be as large as about 90 ° to 100 °. By setting the opening angle (θ) to a large value, preferably 80 ° or more, the area of the rubber film on both end walls (40a) (41a), (40b) (41b) in the liquid chamber axial direction can be increased. Thus, the durability can be further improved.

Further, in the case of this embodiment, the inner metal part (71) and the outer rubber part (72) both have a circumferential width of the stopper (7) projecting radially from the inner cylinder (1). It is formed large to improve durability.

The second embodiment is also mounted as shown in FIG. 10 and used in the same manner as in the first embodiment, so that the axial end walls of both the liquid chambers (4a) and (4b) can be used. The dynamic spring constant can be reduced by the effect of the rubber film forming (40a), (41a), (40b) and (41b), and the vibration damping can be achieved in conjunction with the liquid flow effect between both liquid chambers (4a) and (4b). Not only the effect can be enhanced, but also the durability can be greatly improved because the rubber film forming the end wall is substantially wavy, has a long free length and a large area.

For example, the body mount of the second embodiment in which the end wall in the axial direction of the liquid chamber is substantially corrugated, and the body mount of the first embodiment in which the end wall is straight, are equivalent to actual vehicle running. By comparing the bench tests, it was found that the second embodiment has a service life four times or more that of the first embodiment.

[0037]

As described above, according to the liquid-filled body mount of the present invention, when the vehicle is started when the vehicle is started, the shaft center is set in the vertical direction and both liquid chambers are positioned in the vehicle front-rear direction. In the front-rear direction in which a large vibration acts upon acceleration or braking, the damping coefficient at a frequency of 15 Hz can be set to about 4 N · s / mm, and the dynamic spring constant at about 100 Hz can be reduced to about 1000 N / mm. A large vibration damping effect and sufficient vibration isolation characteristics can be obtained. In particular, when the rubber film forming the end wall in the liquid chamber axial direction has a substantially corrugated shape, the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view taken along line XY of FIG. 2 showing a first embodiment of a body mount of the present invention.

FIG. 2 is a cross-sectional view taken along line X1-X1 of the previous figure.

FIG. 3 is a partially cut-away side view of the same outer cylinder in a separated state.

FIG. 4 is a longitudinal sectional side view excluding an outer cylinder.

FIG. 5 is a cross-sectional view taken along line X2-X2 of the previous figure.

FIG. 6 is a sectional view taken along line X3-X3 of the previous figure.

FIG. 7 is a bottom view excluding the outer cylinder of the above.

FIG. 8 is a longitudinal sectional view of a second embodiment of the present invention, excluding an outer cylinder.

FIG. 9 is a cross-sectional view excluding the above outer cylinder.

FIG. 10 is a longitudinal sectional view of the same mounting state.

[Explanation of symbols]

 (1) Inner cylinder (2) Outer cylinder (21) Flange (3) Rubber elastic body (31) Rubber layer for sealing (32) Convex rib (4a) (4b) Both liquid chambers (40a) (40b) Both ends Wall (5) Intermediate cylinder (51) Flange (6) Orifice passage (7) Stopper

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[Procedure amendment]

[Submission date] January 9, 2002 (2002.1.9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document name]

[Title of the Invention] Liquid-filled body mount

[Claims]

Wherein the metal portion of the stopper, liquid filled body mount according to claim 1 or 2 formed by forming the inner cylinder integrally.

Wherein said stopper is any circumferential width of claims 1 to 3, formed by larger, including the inside of the metal part
2. A liquid-filled body mount according to claim 1.

The distal end surface of claim 5, wherein said stopper is circumferentially opposite side portions
Is chamfered and the corners are rounded.
A liquid-filled body mount according to any one of the preceding claims.

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled body mount interposed between a body of a vehicle and a supporting frame such as a suspension to support the body in a vibration-proof manner.

[0002]

2. Description of the Related Art Conventionally, a body mount used for a rear suspension or the like of a vehicle such as an automobile has been connected and fixed to one of a vehicle body and a suspension-side frame supporting the body. Inner cylinder and an outer cylinder connected and fixed to the other, and these inner and outer cylinders are connected by a rubber elastic body disposed therebetween, and the inner and outer cylinders are further opposed to each other with the inner cylinder interposed therebetween. It is known that two liquid chambers formed between the two liquid chambers are provided, and these two liquid chambers are communicated with each other through an orifice passage so as to obtain an effect of vibration damping by a liquid flow effect of the two liquid chambers (for example, JP-A-2-38730 and JP-A-62-188832.

When a mount having such a structure is used with the liquid chamber positioned in the front-rear direction of the vehicle, there is an effect of lowering the dynamic spring constant in the vertical direction where the load of the body is received, and the mount is somewhat stable. Exhibits anti-vibration characteristics . Only
And, in the longitudinal direction a large vibration at the time or braking acceleration, such as when the vehicle starts to act, on the effect of vibration suppression is less
In addition, the displacement tends to increase due to the presence of the liquid chamber. So
Therefore, a stopper for preventing excessive displacement is provided in the liquid chamber.
Is provided. The present invention, in the body mount of this species
The structure of the stopper provided in the liquid chamber is improved to improve
An object of the present invention is to provide a liquid-filled body mount that performs a favorable stopper function .

[0004]

SUMMARY OF THE INVENTION The present invention provides a liquid filled body mount for vibration damping to support the body and interposed between the body and the support side of the frame of the vehicle, the support and the body An inner cylinder fixed to one of the side frames; an outer cylinder fixed to the other frame; a rubber elastic body interposed between the inner and outer cylinders to elastically connect the two cylinders; A body having two liquid chambers formed between the inner and outer cylinders at portions opposed to each other with the inner cylinder interposed therebetween, and an orifice passage communicating the two liquid chambers, wherein the load input of the body is in the axial direction in mounting, the said two liquid chambers, the inner cylinder
The metal part protruding more in the radial direction is integrated with the rubber elastic body.
And a stopper embedded in the
Has a slight gap with the chamber wall on the outer peripheral side of the liquid chamber
Or is formed to protrude to such an extent that it makes light contact . The tip end surface of the stopper and the chamber wall surface
Is preferably around 1 mm or smaller.
New According to this body mount, the when the vibration in the direction perpendicular to the axis in the opposite direction of both liquid chambers is applied, the tip of the stopper protruding from the inner cylinder in said two fluid chambers
Surface comes into contact with the opposite wall of the chamber, that is, the inner surface of the outer cylinder
By doing so, a stopper function is achieved, and a large displacement exceeding a certain level can be prevented.

[0005] At this time, the stopper, the fixed metal part to the inner cylinder is embedded in the rubber portion integral with the rubber elastic body
Because you are, Ru can mitigate the impact at the time of the stopper action.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view taken along the line XY of FIG. 2 showing a first embodiment of the body mount of the present invention, and FIG.
1 is a cross-sectional view taken along line 1-X1, FIG. 3 is a partially cutaway side view of the same outer cylinder, FIG. 4 is a longitudinal side view excluding the outer cylinder, and FIG. FIG. 6 is a sectional view of FIG.
FIG. 7 is a cross-sectional view taken along the line X3, and FIG.

In the drawing, (1) is an inner cylinder which is connected and fixed to a vehicle body via a mounting member (100) on the body side, and has a relatively thick cylindrical shape. (100) is fastened and fixed by a fastening member (101) such as a bolt. (2) an outer cylinder which is mounted and fixed to the annular mounting member (103) of the frame (102) on the supporting side such as a suspension supporting the body by a press-fitting means or the like via a rubber layer (104); It is arranged substantially concentrically with the inner cylinder (1). These inner and outer cylinders (1) and (2) are usually made of metal such as aluminum or steel.

(3) is a rubber elastic body provided between the inner cylinder (1) and the outer cylinder (2). Two liquid chambers (4a) formed between the inner and outer cylinders (1) and (2) at the portions (symmetrical positions) of the rubber elastic body (3) opposed to each other across the inner cylinder (1) and open to the outer periphery. ) And (4b), and these two liquid chambers (4a) and (4b) are connected to orifice passages (6) described later.
It is communicated by.

The rubber elastic body (3) has an inner periphery vulcanized and bonded to the inner cylinder (1), and has an outer periphery which is fitted inside the outer cylinder (2). (5) is vulcanized and adhered. The intermediate tube (5) has an outward flange portion (51) on the lower end side and the liquid chambers (4).
a) Windows (5a) and (5b) have openings corresponding to (4b). A rubber layer (31) for sealing integrated with the rubber elastic body (3) is provided on the outer peripheral surface of the intermediate cylinder (5), and a convex rib is provided on a part of the rubber layer (31). (32)
The intermediate cylinder (5) is provided with the outer cylinder (2).
The rubber elastic body (3) is hermetically fitted through the rubber layer (31) and the ridge rib (32) inside the rubber elastic body (3).
Are disposed between the inner and outer cylinders (1) and (2), and the liquid chambers (4a) and (4b) in which liquid is sealed are formed. The outer cylinder (2) has a flange (21) at the lower end thereof caulked and fixed to the flange (51) of the intermediate cylinder (5) in the fitted state.

Further, a circumferential groove (6a) extending between the openings (5a) and (5b) is provided in an outer peripheral portion of the intermediate cylinder (5), and an outer cylinder (2) is provided outside the intermediate cylinder (5). ) Is fitted to form the concave groove (6a) as an orifice passage (6) connecting the two liquid chambers (4a) and (4b).

The circumferential opening angle (θ) of the two liquid chambers (4a) and (4b), that is, the opening angle (θ) of the liquid chamber defined by the openings (5a) and (5b) of the intermediate cylinder is a characteristic. Can be set to any angle depending on
° is set to the following range. Incidentally, in this embodiment, the opening angle (θ) is set to approximately 70 °. From the viewpoint of durability and the like, the angle is preferably 80 ° or more as described later.

A stopper (7) projects radially from the inner cylinder (1) in the two liquid chambers (4a) and (4b). The inner wall of the outer cylinder (2) is in contact with the inner wall surface of the outer cylinder (2) to restrict further displacement. The stopper (7) is formed such that its front end surface has a slight gap with respect to the chamber wall surface on the outer peripheral side of the liquid chamber, or is formed so as to protrude to such a degree that it comes into light contact with the liquid chamber. Is set to, for example, about 1 mm or smaller. For example, the distal end surface may be slightly in contact with the chamber wall surface. Further, the gap between the front end surface and the chamber wall surface also has an effect of giving a liquid flow resistance when vibrating in the vertical direction (axial direction).

The stopper (7) is formed by embedding a metal part (71) integrally fixed to the inner cylinder (1) in a rubber part (72) integral with the rubber elastic body (3) as shown in the figure. That is, it is formed so that the contact with the chamber wall surface is performed elastically.
The stopper (7) has a width in the circumferential direction,
By setting a large value including 1), excessive bending deformation can be suppressed, and durability can be improved.

In the body mount having the above-described structure, both end walls (40a) (41a), (40b) and (41b) of the two liquid chambers (4a) and (4b) in the axial direction are formed by the rubber elastic body ( 3) is formed of a rubber film having a required thickness integral with the rubber film, and the rubber film extends substantially linearly from the inner cylinder (1) toward the outer cylinder (2) in an obliquely outward direction in the axial direction. The liquid chambers (4a) and (4b) as a whole have a substantially Y-shaped vertical cross section on the outer peripheral side.

Both end walls (40a) (41a) of the rubber film,
(40b) The inclination angle of (41b) with respect to the axis is 15 ° to 7 °.
0 °, particularly preferably in the range of 30 ° to 60 °. Further, both end walls (40a) (41a) of the rubber film,
(40b) The thickness of (41b) is in the range of 2 to 6 mm.

The end faces (40a), (41a) and (40b) of the rubber film are formed on both end faces in the axial direction of the rubber elastic body (3) between the liquid chambers (4a) and (4b). It is not limited to the same linear or corrugated inclined surface as the outer surface of (41b). In particular, the axial end surface of the lower rubber elastic body (3) is shown in FIG.
As described in the above, the end walls (41a) and (41b) can be recessed so as to form a reverse inclined surface. (33a) shows the concave portion.

Further, a stopper rubber (81) integral with the rubber elastic body (3) is attached to the lower surface of the flange portion (51) of the intermediate cylinder (5) by a vulcanization bonding means, and the vibration is accompanied by the vibration of the body. When the inner cylinder (1) is largely displaced upward, the engagement plate (82) fixed to the lower end of the inner cylinder (1) elastically abuts and engages, thereby restricting a certain displacement or more. It is provided in. In the mounting state of FIG. 1, a stopper member (85) provided with a stopper rubber (84) on a ring fitting (83) is provided on the inner cylinder (1) above the mounting member (103) of the frame (102). Is fitted, and the lower surface of the mounting member (100) elastically abuts when the body is displaced downward, so that the displacement is restricted to a certain degree or more.

The liquid-filled body mount of the present invention having the above-described structure is used in a rear suspension of a vehicle such as an automobile, as shown in FIG. 1, by connecting the inner cylinder (1) to the body-side mounting member (100). The outer cylinder (2) is press-fitted and fixed to an annular mounting member (103) of a suspension frame (102) for use with a fastening member (101) such as a bolt. In particular, at this time, the two liquid chambers (4a) and (4b) are mounted and used so as to be positioned in the front-rear direction of the vehicle.

In this use, the body mount not only reduces the dynamic spring constant in the vertical direction under load of the body in the above-mentioned use, but also makes a right angle to the axis where a large vibration is applied at the time of acceleration or braking when the vehicle starts. Also in the front-rear direction and the oblique front-rear direction, the rubber films forming the both end walls (40a) (41a), (40b) and (41b) in the axial direction of the liquid chambers (4a) and (4b) are inclined. Therefore, the rigidity and elastic force against the vibration in the above-described direction become weaker than in the case of a rubber film perpendicular to the axis, and the dynamic spring constant is reduced by the effect of this rubber film, which is a factor of the two liquid chambers (4a). The vibration damping effect is enhanced in combination with the liquid flow effect during (4b).

For example, when the frequency is 15 Hz, the damping coefficient can be set to about 4 N · s / mm, and the dynamic spring constant at about 100 Hz can be reduced to about 1000 N / mm. As a result, it is possible to exhibit good vibration damping characteristics against vibration in the front-rear direction or in the oblique front-rear direction.

The opposite direction of the two liquid chambers (4a) and (4b)
When the liquid vibrates, the stoppers in the liquid chambers (4a) and (4b)
(7) The end surface of the chamber is facing the wall surface, that is, the outer cylinder
By contacting the inner surface of (2), the stopper function is achieved.
However, a large displacement exceeding a certain level is prevented. 8 to 10
A second embodiment of the present invention is shown, and its basic configuration is common to the above-described embodiments, and the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

In this embodiment, two liquid chambers (4a) and (4b) opposed to each other across the inner cylinder (1) of the rubber elastic body (3).
Axial end walls (40a) (41a), (40b) (41b)
The inner cylinder (1) alternately extends in the radial direction in the radial direction from the side of the inner cylinder (1) in a substantially wavy shape due to the continuation of the curved surface of the inverted round, and the outer cylinder (2) has an expanded shape extending outward in the axial direction. In this case, the inclination angle formed by the straight line connecting the connecting points of the inner cylinder (1) and the outer cylinder (2) of each of the end walls (40a) (41a), (40b) (41b) with respect to the axis is: It is preferable to form the same angle range as in the first embodiment. The same applies to the wall thickness.

As in this embodiment, both end walls (40a) (41
When a), (40b), and (41b) have a substantially corrugated shape, they form an end wall unlike linear or slightly curved and obliquely extending as shown in FIGS. By extending the free length of the rubber film, the stress at the time of bending deformation can be reduced, and the durability is improved.

In the case of the embodiment shown in FIGS.
The circumferential opening angle (θ) of the two liquid chambers (4a) and (4b) is
As shown in the figure, it is set to be as large as about 90 ° to 100 °. By setting the opening angle (θ) to a large value, preferably 80 ° or more, the area of the rubber film on both end walls (40a) (41a), (40b) (41b) in the liquid chamber axial direction can be increased. Thus, the durability can be further improved.

Further, in the case of this embodiment, both liquid chambers (4a)
(4b) As for the stopper (7) projecting radially from the inner cylinder (1) in the inside (4b) , as shown in FIG.
Metal part protruding radially from inner cylinder (1) as in the example
The stopper (7), which is formed by embedding (71) in the rubber part (72),
The tip surface is slightly different from the chamber wall on the outer side of the liquid chamber.
With a small gap or protruding lightly
Is formed. The gap between the tip surface and the chamber wall is
For example, it is set to about 1 mm or smaller.
The inner metal part (71) and the outer rubber part (72)
However, both have a large circumferential width to improve durability. In the case of the figure, the tip surface of the stopper (7)
Has a bevel with slightly chamfered both sides in the circumferential direction,
And the corners are rounded. Also in the second embodiment, the two liquid chambers (4a) and (4b) are mounted as shown in FIG. 10 and used in the same manner as the first embodiment.
When the liquids vibrate in opposite directions, the liquid chambers (4a) and (4b)
The top surface of the topper (7) is the opposite wall of the chamber.
Contact with the inner surface of the outer cylinder (2)
To prevent large displacement exceeding a certain level. Then, Ryoekishitsu (4a) (4b) each of the axial end wall (40a) (41
a), (40b) (41b) The dynamic spring constant can be reduced by the effect of the rubber film, and the vibration damping effect can be enhanced in combination with the liquid flow effect between both liquid chambers (4a) and (4b). In addition to the above, the rubber film forming the end wall has a substantially wavy shape, a long free length and a large area, so that the durability can be greatly improved.

For example, the body mount of the second embodiment in which the end walls in the liquid chamber axial direction are substantially corrugated and the body mount of the first embodiment in which the end walls are straight are equivalent to the actual vehicle running. By comparing the bench tests, it was found that the second embodiment has a service life four times or more that of the first embodiment.

[0028]

As described above, according to the liquid-filled body mount of the present invention, when the vehicle is started when the vehicle is started, the shaft center is set in the vertical direction and both liquid chambers are positioned in the vehicle front-rear direction. In the front-rear direction where large vibration acts during acceleration or braking , that is, in the direction opposite to both liquid chambers,
When angular vibration is applied, the inner cylinder
The protruding tip surface of the stopper is opposite to the chamber wall.
Surface, that is, the inner surface of the outer cylinder,
It acts as a topper, prevents large displacements beyond a certain level,
Also excellent in durability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view taken along line XY of FIG. 2 showing a first embodiment of a body mount of the present invention.

FIG. 2 is a cross-sectional view taken along line X1-X1 of the previous figure.

FIG. 3 is a partially cut-away side view of the same outer cylinder in a separated state.

FIG. 4 is a longitudinal sectional side view excluding an outer cylinder.

FIG. 5 is a cross-sectional view taken along line X2-X2 of the preceding figure.

FIG. 6 is a cross-sectional view taken along line X3-X3 of the previous figure.

FIG. 7 is a bottom view without the outer cylinder.

FIG. 8 is a longitudinal sectional view of a second embodiment of the present invention, excluding an outer cylinder.

FIG. 9 is a cross-sectional view excluding the outer cylinder of the above.

FIG. 10 is a longitudinal sectional view of the same mounting state.

[Explanation of symbols] (1) Inner cylinder (2) Outer cylinder (21) Flange (3) Rubber elastic body (31) Sealing rubber layer (32) Convex rib (4a) (4b) Both liquid chambers (40a ) (40b) End walls (5) Intermediate cylinder (51) Flange (6) Orifice passage (7) Stopper

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiroyuki Takabayashi 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. F-term (reference) 3J047 AA05 AB01 CA02 FA03

Claims (3)

[Claims] An inner cylinder fixed to one of a body of a vehicle and a frame on a support side, an outer cylinder fixed to the other, and an inner cylinder interposed between the inner and outer cylinders to elastically couple the two cylinders. A rubber elastic body to be connected, and two liquid chambers formed between the inner and outer cylinders at portions opposed to each other across the inner cylinder of the rubber elastic body,
An orifice passage communicating these two liquid chambers is provided, and in a body mount in which the load input of the body is made in the axial direction, a metal portion radially protruding from the inner cylinder is integrated with the rubber elastic body in the two liquid chambers. It has a stopper embedded in the rubber part, and the stopper has a slight gap with respect to the chamber wall on the outer peripheral side of the liquid chamber or is formed so as to protrude to such a degree that the stopper slightly touches the chamber wall. Features a liquid-filled body mount. 2. The liquid-filled body mount according to claim 1, wherein the metal portion of the stopper is formed integrally with the inner cylinder. 3. The liquid-filled body mount according to claim 1, wherein the stopper is formed to have a large circumferential width including an internal metal part.