JPH1172134A - Liquid sealed vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a main vibration input directional clearance of a main liquid chamber side stopper part of a liquid sealed vibration control device. SOLUTION: A liquid sealed vibration control device is provided with an inner cylinder metal fitting 10 and an intermediate medal fitting 30 which has a first stopper part 22 protrusively arranged in the main vibration input direction in a part of its outer periphery and a pair of ring parts on the shaft directional both ends to surround both and has first connecting parts 32a and 32c to connect both ring parts to each other in radial directional both side positions slightly dislocated in the circumferential direction to the protruding direction of the first stopper part 22 and second connecting parts 32b and 32d to connect both ring parts to each other in radial directional both side positions almost orthogonal to the first stopper part 22, and is provided with a rubber elastic body having a seal part 41 fixed to an outer periphery of the intermediate metal fitting 30, a first recessed part 43 opening on the first stopper part 22 side and a second recessed part 44 opening on the second stopper part side and an installing metal fitting which is pressed in the outside of the intermediate metal fitting 30 through the seal part and forms a main liquid chamber 51 and a sub-liquid chamber 52 between both recessed parts and forms an orifice passage to communicate both liquid chambers between the second connecting parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device used for an engine mount of a vehicle or the like.

[0002]

2. Description of the Related Art Conventionally, this type of liquid-filled type vibration damping device is
For example, as shown in FIGS. 8 and 9, a rod-shaped stopper portion 2 (device) protruding in the direction perpendicular to the axis of the outer periphery of the inner cylindrical fitting 1.
The intermediate metal fitting 3 is provided so as to surround the stopper portion 2 and the inner cylindrical metal fitting 1 so that the axial direction is parallel to the axial direction of the inner cylindrical metal fitting. The intermediate fitting 3 has a pair of ring portions 3a at both ends in the axial direction.
A pair of long plate-shaped first connecting portions 3b and 3c connecting the two ring portions 3a at both radial positions in the projecting direction of the stopper portion 2 between the two ring portions 3a, and the stopper portion 2 And a pair of long plate-shaped second connecting portions 3d and 3e connecting between the two ring portions 3a at radially opposite side positions substantially orthogonal to each other.
A window is formed between the connecting portions 3b to 3e.

A substantially cylindrical rubber elastic body 4 for integrally connecting the intermediate fitting 3 and the inner tubular fitting 1 is provided. The rubber elastic body 4 includes a seal portion 4 fixed to the outer periphery of the intermediate metal member 3.
a and the first concave portion 4 which opens on the side of the stopper portion 2 and on the opposite side thereof
b and the second concave portion 4c. Further, on the outside of the intermediate fitting 3, a cylindrical portion (outer tubular fitting) of a cylindrical mounting fitting is provided.
5 are fitted by press fitting. The cylindrical portion 5 is coaxially disposed outside the intermediate metal fitting 3 via a seal portion 4a, and
The main liquid chamber 6a and the sub liquid chamber 6b are formed between the first concave part 4b and the second concave part 4c by closing the openings of the concave part 4b and the second concave part 4c in a liquid-tight manner. Main liquid chamber 6a and sub liquid chamber 6b
Is filled with a liquid such as water, and an orifice passage 6 provided between the cylindrical portion 5 and the second connecting portions 3d and 3e.
They communicate with each other via c and 6d. A mounting portion (not shown) for mounting the liquid filled type vibration damping device to an engine or the like is integrally mounted outside the cylindrical portion 5.

In this liquid-filled type vibration damping device, for example, an inner cylinder fitting 1 is connected to a support member on the vehicle body side, and a mounting portion provided on a tubular portion 5 is connected to a support member on the engine side. The stopper portion 2 is arranged upward in the main vibration input direction, and the main liquid chamber 6a and the sub liquid chamber 6b are arranged vertically. When a vehicle vibration is generated between the inner cylindrical member 1 and the cylindrical portion 5, the vibration is effectively performed by the elastic action of the rubber elastic body 4 and the liquid column resonance action of the liquid flowing through the orifice passages 6c and 6d. Is attenuated.

[0005]

By the way, in the above-mentioned liquid filled type vibration damping device, the first connecting portion 3b is located above the stopper portion 2 which protrudes into the main liquid chamber 6a. 2, the clearance in the main vibration input direction is reduced by the thickness of the first connecting portion 3b and the upper and lower rubber layers sandwiching the first connecting portion 3b. Therefore, there is a problem in that the degree of freedom of the design of the vibration isolator is lost, for example, the limited range of the size of the stopper portion 2 becomes narrower, and the size of the entire liquid-sealed type vibration isolator must be increased. Also, the stopper 2
The first connecting portion 3b is liable to be damaged by the increase of the surface pressure of the first connecting portion 3b.
If the width of is increased, the thickness of the rubber layer must be further increased, and the clearance becomes smaller.
An object of the present invention is to provide a liquid-filled type vibration damping device which has a large durability in a main vibration input direction of a stopper portion protruding toward a main liquid chamber and has excellent durability. With the goal.

[0006]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to the first aspect is that an inner cylinder connected to one of a vehicle body and an engine of a vehicle. A bracket, a stopper protruding on one side toward the main vibration input direction from the engine on the outer periphery of the inner cylinder, and an axial direction surrounding the inner cylinder including the stopper is the axial direction of the inner cylinder. A first pair which is parallel to each other, has a pair of ring portions at both ends in the axial direction, and connects between the pair of ring portions at a position slightly shifted in a circumferential direction with respect to a projecting direction of the stopper portion between the pair of ring portions; A tubular intermediate fitting having a connecting portion and a pair of second connecting portions connecting the two ring portions at both radial positions substantially orthogonal to the projecting direction of the stopper portion between the pair of ring portions; Connect the metal fitting to the inner cylinder, and fix it to the outer A cylindrical rubber elastic body having a sealing portion, a first concave portion opened between the two ring portions on the stopper portion side, and a second concave portion opened between the two ring portions on the opposite side of the stopper portion; A main liquid chamber and a sub liquid chamber which are fixed to the outer periphery via a seal portion and which are liquid-tightly closed at openings of the first and second concave portions and filled with liquid between the first and second concave portions; And a tubular portion forming an orifice passage communicating the main fluid chamber and the sub fluid chamber with the second connecting portion, and provided outside the tubular portion and connected to the other of the vehicle body and the engine. And a mounting bracket having a mounting portion to be mounted.

In the first aspect of the present invention, the first connecting portion of the intermediate metal fitting is provided at a radial position slightly shifted in the circumferential direction from the main vibration input direction, so that the main vibration input is provided. The clearance on the bounding side of the stopper portion facing the direction is widened by an amount excluding the first connecting portion and the rubber layer provided around the first connecting portion. As a result, according to the first aspect of the invention, large vibrations applied in the main vibration input direction can be efficiently absorbed. Further, by providing the first connecting portion at a radial position slightly shifted in the circumferential direction from the main vibration input direction, the first connecting portion can avoid an impact due to the collision of the stopper portion, and is not damaged. Absent.

According to a second aspect of the present invention, there is provided the liquid filled type vibration damping device according to the first aspect, wherein the tip end surface of the stopper portion is a convex curved surface corresponding to the inner surface of the cylindrical portion. In addition to the shape, the notch portion is provided in a portion of the distal end surface of the stopper portion that faces the first connecting portion in the radial direction.

In the invention according to claim 2 configured as described above, since the distal end surface of the stopper portion is formed into a convex curved shape in conformity with the inner peripheral surface of the cylindrical portion, the surface pressure is dispersed and the relative Can be reduced. As a result, the liquid-filled type vibration damping device can withstand a large load and its durability is enhanced. Further, the collision of the first connecting portion with the stopper portion is more reliably prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are cross-sectional views of a liquid-filled type vibration damping device according to the embodiment. (Excluding parts) and longitudinal sectional views (excluding mounting brackets). The liquid-filled vibration damping device has a cylindrical inner cylinder fitting 10.
A stopper member 20 is fitted by a cylindrical portion 21 at an axially intermediate position on the outer periphery of the inner cylinder fitting 10. At the center of the outer periphery of the cylindrical portion 21, a rod-shaped first stopper portion 22 protruding in a direction perpendicular to the axis is provided. On the distal end side of the first stopper portion 22, a convexly curved head portion 2 which swells substantially in the circumferential direction and whose distal end surface corresponds to the inner surface of a tubular portion 61 described later.
2a is provided. A cutout portion 22b is formed in a portion of the tip portion of the head portion 22a on the side perpendicular to the axis, that is, on a portion of the first connecting portion 32a described later. On the radially opposite side of the outer periphery of the cylindrical portion 21 from the first stopper portion 22, second stopper portions 23 slightly protruding in the direction perpendicular to the axis are provided at two positions on both ends in the axial direction. The direction in which the stopper member 20 projects is defined as the main vibration input direction of the liquid-filled type vibration damping device.

Outside the inner cylindrical member 10 including the stopper member 20, a cylindrical intermediate member 30 is arranged so as to be separated from the outer end of the stopper member 20 and its axis is parallel to the axis of the inner cylindrical member 10. ing. The intermediate fitting 30 is shown in FIGS.
As shown in FIG. 2, a pair of ring portions 31 are provided at both ends in the axial direction, and between the ring portions 31, four long plate-shaped connecting portions 32a to 32d extending in the axial direction form the ring portion 31. The ring part 31 and each connecting part 3
Four windows 33 are formed between 2a to 32d.

As shown in FIG. 1, one of the first connecting portions 32a and 32c is connected to the first stopper portion 22.
On the other hand, the other first connecting portion 32c corresponds to the second stopper portion 23 and is disposed at a position slightly shifted in the circumferential direction with respect to the stopper member 20 oriented in the main vibration input direction. . The first connecting portions 32a and 32c have substantially the same width, the first connecting portion 32a is flush with the ring portion 31 and has no step, and the first connecting portion 32c has an orifice passage for providing a ring. The connecting portion has a step with respect to the surface of the portion 31 and is provided with a slight depression toward the center.

The second connecting portions 32b and 32d are disposed at positions corresponding to the stopper member 20 in a direction substantially perpendicular to the stopper member 20. One second connecting portion 32b is connected to the first connecting portion 3
It is approximately three times wider than 2a and 32c, and has a step at the connecting portion with respect to the surface of the ring portion 31 to provide the orifice passage, and is provided with a slight depression toward the center. I have. The other second connecting portion 32d is connected to the first
It is approximately twice as wide as the connecting portions 32a and 32c, is flush with the surface of the ring portion 31, and is provided with no step at the connecting portion. The intermediate fitting 30 is formed by punching a metal band-shaped plate material having a constant thickness having spring elasticity, and bending the formed punched material into a cylindrical shape. The inner cylindrical member 10 and the intermediate member 30 are integrally connected by a substantially cylindrical rubber elastic body 40.

The rubber elastic body 40 is constituted by a thin seal portion 41 outside the outer peripheral portion of the intermediate metal fitting 30, and a thick layer filled in a portion between the inner peripheral portion and the inner cylindrical metal fitting 10. As shown in FIG. 2, an end rubber portion 42 is provided between the both ring portions 31 and the inner cylinder fitting 10. As shown in FIG. 1, a second connecting portion 32 is provided between the two ring portions 31.
A portion (above the thin layer on the front surface side of the first stopper portion 22) above the horizontal position from the upper ends of the b and 32d is a first concave portion 43 opened to the window portion 33. The opposite side of the first concave portion 43 is a second concave portion 44 which is lower than the lower ends of the second connecting portions 32b and 32d and opens to the window 33 in a belt shape along the outer periphery of the intermediate fitting 30. Both recesses 43, 44
The space between the end rubber portion 42 and the center rubber portion 45 surrounding the inner cylinder fitting 10, the first stopper portion 22, and the second stopper portion 23 follows the end rubber portion 42.

In the center rubber portion 45, a second connecting portion 32b is provided.
Via the lower side of the second stopper portion 23 from the second connecting portion 3
A strip-shaped hollow portion 46 is provided near 2d,
The thin rubber layer below the hollow portion 46 serves as a diaphragm portion 47 including the first connecting portion 32c. 2nd connection part 32b
Outside the first recess 43 and the second recess 4
A first orifice passage 48a is provided for communicating the first orifice 4 with the first orifice. The outside of the first connecting portion 32c is
Only the thin rubber layer is provided, and the second orifice passage 48b is provided so as to communicate between the two divided second concave portions 44.

Further, outside the second connecting portion 32d, a third orifice passage 48c penetrating through the seal portion 41 and communicating the first concave portion 43 and the second concave portion 44 is provided. The rubber elastic body 40 is integrally formed by performing rubber vulcanization molding in a state in which the inner cylinder fitting 10 and the intermediate fitting 30 are set in a molding die (not shown). A rubber vulcanized molded product 70 that is an intermediate product including the cylindrical metal fitting 10 and the intermediate metal fitting 30 is configured.

FIG. 6 shows the outer periphery of the rubber vulcanized molded product 70.
And as shown in FIG. 7, the mounting bracket 60 is mounted. The mounting bracket 60 includes a cylindrical portion 61 and an odd-shaped mounting portion 62 mounted on the outer periphery of the cylindrical portion 61 by welding. Further, the mounting portion 62 includes a first mounting portion 63 and a second mounting portion 64. The first mounting portion 63 has a wide, substantially rectangular shape, and has a curved side edge portion near the mounting end 63a1 to the cylindrical portion 61, and has a reduced width. The first mounting portion 63 is located on the opposite side from an intermediate position of the mounting end 63a1. A flat plate portion 63a formed with a V-shaped portion 63a2 cut out in a substantially equilateral triangle, and a side edge portion 63b1 which is bent at right angles to both side edges thereof and attached to the cylindrical portion 61 are concaved in an arc shape. The formed bent portion 63b is provided. The flat plate portion 63a is provided with a mounting hole 63a3 for screwing the mounting bracket 60 to a mating member.

The second mounting portion 64 is formed by bending a substantially pentagonal metal plate into two at a middle bending portion 64a in the width direction, and bending the metal plate in a substantially rectangular shape in the longitudinal direction so that the inner edge 64b becomes an arc shape. It is formed as follows. The bending angle at the bent portion 64a is large at the one end 64c, that is, the degree of bending is small, and is gradually reduced toward the other end 64d.
In 4d, the angle is approximately 60 °. The first mounting portion 63 and the second
The other end 64d of the second mounting portion 64 is fixed to and integrated with the V-shaped portion 63a2 of the first mounting portion 63 by welding to the mounting portion 64. The mounting bracket 60 is formed by fixing the arc-shaped mounting side edge portion 63b1 and the inner edge 64b of the integrated first mounting portion 63 and second mounting portion 64 to the outer peripheral surface of the cylindrical portion 61 by welding. Is done.

A mounting bracket 60 for the rubber vulcanized molded article 70
Is assembled in a liquid tank filled with liquid to be filled in a main liquid chamber 51 and a sub liquid chamber 52 to be described later.
Then, the mounting bracket 60 is immersed, and in this state, the rubber vulcanized molded product 70 is press-fitted into the tubular portion 61 of the mounting bracket 60 and fitted.
As the liquid, a non-compressed fluid such as water, alkylene glycol, or silicone oil is used. Thereby, the mounting bracket 60 is fixed in a state where the inner peripheral surface of the cylindrical portion 61 is in close contact with the outer peripheral surface of a portion corresponding to the rubber seal portion 41 of the rubber elastic body 40 on the outer peripheral portion of the rubber vulcanized molded product 70. A liquid is sealed in the main liquid chamber 51 at the same time that the main liquid chamber 51 is formed between the cylindrical part 61 and the first concave part 43, and a sub-liquid is formed between the cylindrical part 61 and the second concave part 44. The liquid is sealed in the sub liquid chamber 52 at the same time when the chamber 52 is formed. At the same time, the first, second,
Third orifice passages 48a to 48c are also formed, and liquid is sealed in the passages. Thereafter, the assembled rubber vulcanized molded product 70 and the mounting bracket 60 are taken out of the liquid tank,
By performing the post-processing, a liquid-filled type vibration damping device as shown in FIGS. 6 and 7 is obtained.

In the liquid filled type vibration damping device constructed as described above, for example, the inner cylinder fitting 10 is connected to the mounting member on the vehicle body side of the automobile, and the mounting fitting 6 is mounted on the engine side mounting member.
The main liquid chamber 51 and the sub liquid chamber 52 are disposed in the direction in which the stopper member 20 protrudes, that is, in the vertical direction, which is the main vibration input direction of the engine. When vehicle vibration occurs between the inner cylinder fitting 10 and the mounting fitting 60, the elastic action of the rubber elastic body 40 and the first
The vibration of the liquid flowing through the third orifice passages 48a, 48b, 48c is effectively attenuated by the liquid column resonance action.

At this time, in the liquid filled type vibration damping device, the first connecting portion 32a is provided at a radial position slightly displaced in the circumferential direction from the main vibration input direction, so that the first connecting portion 32a faces the main vibration input direction. The clearance of the stopper portion 22 on the bound-bound side is widened by an amount excluding the first connecting portion 32a and the rubber layer provided around the first connecting portion 32a. As a result, large vibration applied in the main vibration input direction can be absorbed. Further, the distal end surface of the first stopper portion 22 has a convex curved shape that matches the inner peripheral surface of the cylindrical portion 61, so that the first stopper portion 22 has a first curved surface.
The surface pressure applied to the distal end surface of the stopper portion 22 can be dispersed and suppressed. As a result, the liquid-filled type vibration damping device can withstand a large load, and its durability is enhanced.

Further, the first connecting portion 32a is provided at a radial position slightly displaced in the circumferential direction from the main vibration input direction, and the distal end surface of the first stopper portion 22 is radially opposed to the first connecting portion 32a. By providing the cutout portion 22b larger than the first connecting portion 32a in the portion, the first connecting portion 32
a is reliably prevented from contacting the first stopper portion 22.
As a result, the first connecting portion 32a can avoid an impact due to the movement of the first stopper portion 22, and can prevent damage due to a collision. The specific external shape and the like of the liquid-filled type vibration damping device of the present invention are not limited to those shown in the above embodiment, but can be changed as appropriate.

[Brief description of the drawings]

FIG. 1 schematically shows a liquid-filled type vibration damping device (excluding a part of a mounting bracket) according to an embodiment of the present invention, taken along line II-II of FIG.
It is sectional drawing of a line direction.

FIG. 2 is a cross-sectional view of the liquid-filled type vibration damping device (excluding a mounting bracket) in a direction II in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of FIG. 4, showing an intermediate fitting used in the liquid-filled type vibration damping device.

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, showing an intermediate fitting used in the liquid-filled type vibration damping device.

FIG. 5 is a cross-sectional view taken along the line IV-IV of FIG. 3, showing an intermediate fitting used in the liquid-filled type vibration damping device.

FIG. 6 is a plan view schematically showing the liquid-filled type vibration damping device.

FIG. 7 is a front view schematically showing the liquid-filled type vibration damping device.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 9 schematically showing a conventional liquid-filled type vibration damping device (excluding a part of a mounting bracket).

FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8 of a conventional liquid-filled type vibration damping device (excluding a mounting bracket).

[Explanation of symbols]

10 ... inner cylinder fitting, 20 ... stopper member, 21 ... cylindrical part,
Reference numeral 22: first stopper portion, 22a: head portion, 22b: notch portion, 23: second stopper portion, 30: intermediate fitting, 31: ring portion, 32a, 32c: first connecting portion, 32b, 32d
.., A second connecting portion, 33, a window, 40, a rubber elastic body, 41,
Seal portion, 42 end rubber portion, 43 first concave portion, 44 second concave portion, 45 central rubber portion, 46 hollow portion, 47 diaphragm portion, 48a first orifice passage, 48b second orifice passage , 48c... Third orifice passage, 51
... Main liquid chamber, 52 ... Sub liquid chamber, 60 ... Mounting fitting, 61 ... Cylindrical part, 62 ... Mounting part, 63 ... First mounting part, 64 ... Second mounting part.

Claims (2)

[Claims] An inner cylinder connected to one of a vehicle body and an engine; and a stopper protruding from one side of an outer periphery of the inner cylinder in a main vibration input direction from the engine. And an axial direction surrounding the inner cylindrical member including the stopper portion is parallel to an axial direction of the inner cylindrical member, and has a pair of ring portions at both ends in the axial direction. A first connecting portion for connecting the two ring portions at a position slightly shifted in a circumferential direction with respect to a projecting direction of the stopper portion, and a radial direction substantially orthogonal to the projecting direction of the stopper portion between the pair of ring portions. A pair of second connecting members between both ring portions at both side positions of
A cylindrical intermediate metal fitting having a connecting part, a seal part connecting the intermediate metal fitting and the inner cylindrical metal fitting and being fixed to an outer periphery of the intermediate metal fitting, and an opening between the two ring parts on the stopper part side; A cylindrical rubber elastic body having a first concave portion to be formed and a second concave portion opened between the two ring portions on a side opposite to the stopper portion; and being fixed to an outer periphery of the intermediate fitting via the seal portion,
The first and second recesses are liquid-tightly closed to form a main liquid chamber and a sub liquid chamber filled with liquid between the first and second recesses. A cylindrical portion forming an orifice passage communicating the main liquid chamber and the sub liquid chamber between the two connecting portions, and a mounting portion provided outside the cylindrical portion and connected to the other of the vehicle body and the engine And a mounting bracket having the following. 2. The liquid-filled type vibration damping device according to claim 1, wherein the distal end surface of the stopper portion has a convex curved surface shape corresponding to the inner surface of the cylindrical portion, and the distal end surface of the stopper portion has A liquid-sealed vibration isolator, wherein a cutout portion is provided in a portion radially opposed to the first connecting portion.