JPH1163086A - Cylinder shaped vibration proof apparatus and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate management of a sealing liquid quantity, and at the same time improve durability of a diaphragm. SOLUTION: A main spring part 11 inserts an substantially elliptical intermediate ring 13 with its outer diameter equal to an inner diameter of an outer cylinder 3, and varies rigidity in two orthogonal directions each other, a diaphragm 35 is shaped in a substantially true circle, and is successively formed around a full circumference, and at its outer circumference an outer circumference sleeve 14 whose initial outer diameter is greater than the inner diameter of the outer cylinder 3 is integrally provided. After the outer circumference sleeve 14 is narrowed more than the inner diameter of the outer cylinder 3, when an interior body 2 is inserted into an exterior body 1, a main liquid chamber 16 is formed between a side wall part 5 and the main spring part 11, and this chamber and a subsidiary liquid chamber 17 communicating with an orifice passage 18 of the main spring part 11 are formed between the main spring part 11 and the diaphragm part 12, the excess liquid of the main liquid chamber is ejected from a gap between the outer circumference sleeve 14 and the outer cylinder 3 through the orifice passage 18; and thereafter sealing is completed by narrowing the outer cylinder 3 around the outer circumference sleeve 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular liquid-sealed vibration isolator used for a subframe of an automobile and a method for manufacturing the same.

[0002]

2. Description of the Related Art Such a tubular liquid-sealed vibration isolator is known. For example, Japanese Patent Application Laid-Open No. Hei 3-20138 discloses an inner cylinder having a bottomed cylindrical main body formed around an inner cylinder. One end is divided into an outer cylinder covered by a side wall, and the body rubber has a spring stiffness that changes hard and soft in the orthogonal radial direction in the axial orthogonal cross section, and the hard part is formed at an axially symmetric position. The soft portion is formed of a diaphragm portion which is axially symmetrically shifted from the thin portion by approximately 90 ° in the circumferential direction. The diaphragm portion is formed as a thin wall portion by engraving a thick portion of the main rubber in the axial direction to form a sub liquid chamber.

When the inner cylinder is fitted into the outer cylinder from the open end of the outer cylinder such that the open side of the sub-liquid chamber is at the top, a main liquid chamber is formed between the end of the main rubber and the side wall. The partitioning member provided in the main liquid chamber communicates with the sub liquid chamber via an orifice passage. In this state, one end of the inner cylinder is pressed into the periphery of a concentric projection formed at the center of the side wall portion of the outer cylinder to provide an integrated cylindrical liquid seal vibration isolator.

Japanese Utility Model Publication No. 5-34350 discloses a similar cylindrical liquid seal vibration isolator comprising an outer body having a bottomed cylindrical shape and an inner body fitted inside the outer body. This exterior body has a cylindrical outer cylinder and a diaphragm formed so as to form a bottom substantially closing one end in the axial direction, and the diaphragm has a substantially perfect circular shape when viewed from the axial direction of the outer cylinder. As described above, a cylindrical member for fitting is integrally formed at a central portion thereof.

On the other hand, the inner body is connected to the inner body intermediate sleeve fitted into the outer cylinder, the inner cylinder concentrically arranged inside the inner sleeve, and the inner cylinder and the intermediate sleeve at an interval of about 180 ° in the circumferential direction. A main spring portion extending in the shape of an arm in the radial direction, the inner body is fitted into the outer cylinder, and the tip of the inner cylinder is pressed into a cylindrical member formed at the center of the diaphragm portion, and the outer cylinder is Are integrated by caulking the open end of the inner sleeve to the intermediate sleeve, and a liquid chamber is formed between the outer body and the inner body.

[0006]

A preferred function of the diaphragm in such a tubular liquid-sealed vibration isolator is to realize a change in the capacity of the sub-liquid chamber without affecting the dynamic spring characteristics of the entire device. Therefore, it is required to make the diaphragm portion as soft as possible.
However, in the case of the structure described in Japanese Patent Application Laid-Open No. Hei 3-20138, the diaphragm portion is formed integrally with the main spring portion,
In addition, since the diaphragm is formed by being divided into a size of about 1/4 circumference at intervals of about 180 degrees in the circumferential direction, the diaphragm portion is relatively hard, and the dynamic spring characteristics are high (hard). On the other hand, if this part is softened to facilitate deformation of the diaphragm part and lower (soften) the dynamic spring characteristic,
This time the overall durability will be reduced.

Therefore, for this purpose, as in Japanese Utility Model Publication No. 5-34350, it is necessary to form the diaphragm portion separately from the main spring portion and to form a substantially circular shape over the entire circumference. Preferably, in this case, the durability of the diaphragm portion itself is also improved. However, such a structure causes a very difficult problem in managing the amount of the sealed liquid, which has a very significant effect on the performance of the cylindrical liquid seal vibration isolator.

That is, when the inner cylinder is fitted to the cylindrical member of the diaphragm and the outer periphery of the intermediate sleeve is fitted to the inner surface of the outer cylinder during assembly in the liquid, the liquid between the outer body and the inner body is sealed. After that, the escape area is lost.However, since the space volume between the exterior body and the interior body is further reduced by press-fitting, etc. from this point in time, it is usually fixed by caulking, so the actual amount of sealed liquid increases. As a result, it is extremely difficult to adjust the amount of liquid at the time of sealing so that the initial value of the internal pressure of the liquid chamber falls within the range of an appropriate set value.

Therefore, the main spring portion changes the spring stiffness mutually in two radial directions orthogonal to each other, and the diaphragm portion is formed so as to be separated from the main spring portion and to form a substantially perfect circle around the entire circumference. It would be desirable to be able to assemble with accurate volume control. The main purpose of the present application is to solve such a problem.

[0010]

In order to solve the above problems, a cylindrical liquid seal vibration isolator according to claim 1 of the present invention comprises: an inner cylinder; an outer cylinder formed coaxially around the inner cylinder; A main spring portion made of an elastic member provided between the inner and outer cylinders, a side wall portion attached between one axial end portions of the inner and outer cylinders to form a main liquid chamber between the main spring portions, and an axial direction of the inner and outer cylinders. A diaphragm portion, which is attached between the other ends and forms a sub-liquid chamber between itself and the main spring portion, and has a thin-film diaphragm that is easily elastically deformed, and the main liquid chamber and the sub-liquid chamber are connected so as to communicate with each other. In a cylindrical liquid seal vibration isolator having an orifice passage formed in the axial direction of the liquid chamber, the main spring portion and the diaphragm portion are divided and formed, and the diaphragm is formed continuously over the entire circumference, Adjust the outer diameter of the diaphragm to the part of the outer cylinder where the main spring is fitted. Than the large inner diameter, characterized in that the small diameter.

According to a second aspect of the present invention, there is provided a cylindrical liquid-sealed vibration isolator according to the first aspect,
It is characterized in that the main spring portion has at least an intermediate portion in the axial direction having a cross section of a different diameter, and the diaphragm has a substantially perfect circular shape.

According to a third aspect of the present invention, there is provided the cylindrical liquid-sealed vibration isolator according to the first aspect,
A first seal for sealing between the outer cylinder and the outer peripheral portion of the diaphragm portion
And a double seal structure is provided by providing a second seal portion between the diaphragm portion and the main spring portion.

According to a fourth aspect of the present invention, there is provided a cylindrical liquid-sealing vibration isolator according to the first aspect of the invention.
The main spring portion is characterized in that a cylindrical intermediate ring having a substantially elliptical cross section in the direction perpendicular to the axis is insert-molded in an elastic member.

According to a fifth aspect of the present invention, there is provided a cylindrical liquid-sealing vibration isolator according to the fourth aspect,
The orifice passage is constituted by a through hole that passes through the thickness of the thick portion formed inside the intermediate ring that forms the substantially elliptical shape of the main spring portion in the axial direction, and from the inner peripheral side or the outer peripheral side of the through hole. A stopper portion protruding toward the opposite side is integrally formed.

According to a sixth aspect of the present invention, there is provided a cylindrical liquid-sealed vibration isolator according to the first aspect of the invention.
The side wall portion has a substantially funnel-shaped caulking positioning fitting fitted into one end opening of the outer cylinder, and the caulking positioning metal fitting is formed by lamination with a plate-like member.

According to a seventh aspect of the present invention, there is provided a cylindrical liquid-sealed vibration isolator according to the sixth aspect, wherein:
The positioning metal fitting at the time of crimping is constituted by a pair of press parts which are divided in half in the circumferential direction.

According to a second aspect of the present invention, there is provided a method of manufacturing a cylindrical liquid-sealed vibration isolator, comprising: forming an exterior body comprising an outer cylinder and a side wall attached to one end thereof; Forming an interior body with a main spring part whose middle part has a different diameter cross section and a maximum outer diameter that is approximately the same as the inner diameter of the outer cylinder, and a substantially circular shape and a diaphragm part whose outer diameter is smaller than the inner diameter of the outer cylinder And
After inserting the inner body into the outer body in the liquid from the open end side, one end of the inner cylinder and the side wall are press-fitted to form a main liquid chamber between the side wall and the main spring. In addition, a sub liquid chamber communicating with the main liquid chamber and the orifice passage is formed between the main spring part and the diaphragm part, and then a part of the outer cylinder is drawn to seal the outer peripheral part of the diaphragm part. It is characterized by doing.

According to a ninth aspect of the present invention, in the method of manufacturing a cylindrical liquid-sealed vibration isolator, the inner body is slid in the axial direction of the inner cylinder. Forming with a pair of slide dies and an open / close die that opens and closes in the direction perpendicular to the axis to form a gap between the outer peripheral sides of the main spring portion and the diaphragm portion and adjacent ends of the main spring portion and the diaphragm portion. Features.

According to a tenth aspect of the present invention, there is provided a method for manufacturing a cylindrical liquid-sealed vibration isolator according to the eighth aspect. The outer peripheral sleeve also has a large diameter, and an initial drawing is performed so that the outer peripheral sleeve has a diameter smaller than the inner diameter of the outer cylinder before fitting the outer peripheral sleeve into the outer cylinder.

According to a method for manufacturing a cylindrical liquid-sealed vibration isolator according to claim 11 of the present invention, the method for manufacturing a cylindrical liquid-sealed vibration isolator according to claim 10 is performed after drawing the outer cylinder around the outer peripheral sleeve. The end portion of the outer cylinder is fixed to the diaphragm portion by caulking so as to press the diaphragm portion toward the main spring portion.

[0021]

According to the first aspect of the present invention, the intermediate portion forms the main spring portion and the diaphragm portion on the common inner cylinder, and the outer diameter of the outer peripheral sleeve of the diaphragm portion is changed to the main spring portion of the outer cylinder. Since the diameter is smaller than the inner diameter of the part to be fitted, when assembling in the liquid tank, excess liquid can be discharged from the gap between the outer peripheral sleeve of the diaphragm part and the outer cylinder. It is possible to accurately control the amount of liquid sealed in the main liquid chamber, which has a very significant effect on performance.

According to the second aspect of the present invention, since the diaphragm portion is separated from the main spring portion, the diaphragm portion can be formed continuously around the entire circumference, and the diaphragm portion affects the dynamic spring characteristics of the main spring portion. It can be easily deformed and durable.

In addition, by making the main spring portions have different diameter sections, the spring stiffness can be mutually changed in two radial directions orthogonal to each other, and the diaphragm portion has a substantially perfect circular shape which is preferable for the highest durability. Can be
It is possible to simultaneously provide the directionality and the durability of the spring rigidity.

According to the third aspect of the present invention, the first seal formed on the outer periphery of the diaphragm portion is brought into close contact with the inner surface of the throttle portion of the outer cylinder, and the end surface of the diaphragm portion is pressed against the end surface of the main spring portion. In addition, since the two sealing end surfaces are sealed with the second seal, even if a dividing portion is formed between the diaphragm portion and the main spring portion, the sealing can be reliably performed.

According to the fourth aspect of the present invention, when the main spring portion is formed of an elastic body, the intermediate ring having a substantially elliptical cross section is insert-molded. By changing the thickness of the member, the spring rigidity can be easily changed in two directions orthogonal to the radial direction in the cross section orthogonal to the axis of the main spring portion.

According to the fifth aspect of the present invention, since the stopper protruding from the outer peripheral side or the inner peripheral side is provided in the orifice passage, the spring rigidity can be easily adjusted by the amount of protrusion of the stopper.

According to the sixth aspect of the present invention, the positioning metal fitting at the time of crimping is laminated on the outer flange of the outer cylinder so that the inner metal pipe and the intermediate ring are inserted into the outer cylinder and assembled by caulking. Since the end surface protruding into the outer cylinder abuts on the end face of the intermediate ring and positions it, the intermediate ring and the diaphragm portion are accurately positioned in the axial direction of the inner cylinder, and there is little variation during assembly,
In addition, since the change in the amount of the filled liquid is reduced, the quality is stabilized.

According to the invention of claim 7, since the positioning metal fitting at the time of caulking is constituted by a pair of halves which form a substantially funnel shape when combined, each half is press-formed from a plate-like member. It can be easily formed.

According to the method of the eighth aspect, a gap is formed between the periphery of the diaphragm and the outer cylinder, and the end of the outer cylinder overlapping the diaphragm after the main liquid chamber is formed is narrowed to reduce the throttle. Since the gap is formed and the gap is sealed, the surplus liquid can be quickly discharged from the gap to make the amount of the sealed liquid accurate.

According to the ninth aspect of the present invention, when the inner body is formed so as to form a gap between the adjacent ends of the main spring portion and the diaphragm portion, a pair of slides that slide in the axial direction of the inner cylinder. The mold can be molded with an open / close mold that opens and closes in the direction perpendicular to the axis to simultaneously form the outer peripheral sides of the main spring portion and the diaphragm portion and the gap between the split portions.
The diaphragm portion and the main spring portion having different structures can be molded at once in the same process on a common inner cylinder by using a common molding die.

According to the method of the tenth aspect, the initial outer diameter of the outer peripheral sleeve is formed larger than the inner diameter of the outer cylinder, and the inner sleeve is squeezed smaller than the inner diameter of the outer cylinder before inserting the inner body into the outer body. The gap between the outer periphery of the diaphragm portion and the outer cylinder can be easily formed, and the diaphragm portion can be greatly curved in a radial cross section so as to be easily deformed by squeezing the diaphragm portion. Is formed, the formation of the curved portion can be further facilitated.

According to the eleventh aspect, after the outer cylinder around the outer peripheral sleeve is squeezed, one end of the outer cylinder is fixed by caulking so that the diaphragm is pressed toward the main spring. The opening can be prevented from being formed between the diaphragm and the main spring due to the squeezing, which often occurs when the caulking is performed before the outer cylinder is squeezed.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A subframe to which the present invention is applied will be described with reference to FIGS. FIG. 1 is a diagram showing the subframe assembling process in cross section of each component, FIG. 2 is an external side view of the subframe, FIG. 3 is a plan view thereof (a direction indicated by an arrow A in FIG. 2), and FIG. FIG. 5 is a cross-sectional view (cross-sectional view taken along line 4-4 in FIG. 3), FIG. 5 is a cross-sectional view of this subframe (cross-sectional view along line 5-5 in FIG. 2), and FIG. Bottom view of the body (direction of arrow C in FIG. 7),
FIG. 7 is a cross-sectional view of the interior body at a difference of 90 ° along the axial direction.
9 is a cross-sectional view along the axial direction of the exterior body, FIG. 9 is a view showing the flange portion of the outer cylinder from the direction indicated by the arrow F in FIG. 8, FIG. 10 is a partially enlarged view of the B section shown in FIG. FIG. 9 is a partially enlarged view of a D part and an E part shown in FIG. 8.

First, the schematic structure of the subframe will be described. As shown in FIG. 1, this subframe is obtained by assembling two parts of an intermediate body composed of an exterior body 1 and an interior body 2 fitted inside the exterior body.

As is clear from FIG. 1 and FIGS. 2 to 5 showing the completed state, the exterior body 1 has a metal outer cylinder 3 and an outer flange 4 formed at one end thereof, and a side wall portion 5 integrated therewith. A flange 6 having a flange parallel to the outer flange 4 is integrated with the side wall 5.

The flange 6 has a substantially funnel-like shape, and has a press-fit portion 7 whose central portion is cylindrical and extends in the axial direction inside the outer cylinder 3. The other end of the outer cylinder 3 has a narrowed portion 8 formed so as to have a diameter smaller than the outer diameter of the general portion by a small dimension S, and the other end is a caulked portion 9 (FIG. 4).

The inner body 2 includes an inner cylinder 10 disposed substantially coaxially inside the outer cylinder 3 and a main spring portion 11 and a diaphragm portion 12 formed therearound. It is fixed inside the outer cylinder 3 by an intermediate ring 13 and an outer ring 14 provided on the outer peripheral portion.

One end of the inner tube 10 forms a small-diameter portion 15, which is press-fitted into the press-fitting portion 7 of the flange fitting 6, and the caulking portion 9 of the outer tube 3 is provided at the other end in the axial direction with the diaphragm portion 12.
The exterior body 1 and the interior body 2 are integrated by fixing the end surface to the outer peripheral ring 14 of FIG.

A space surrounded by the side wall portion 5 and one end of the main spring portion 11 forms a main liquid chamber 16 formed continuously around the entire circumference.
A space surrounded by the diaphragm portion 12 and the other end of the main spring portion 11 similarly has a sub-liquid chamber 17 formed continuously around the entire circumference.
Make

An orifice passage 18 communicating between the main liquid chamber 16 and the sub liquid chamber 17 is formed to penetrate in the axial direction of the main spring portion 11, and a stopper portion 19 is formed in the orifice passage 18 from the outer peripheral side of the peripheral wall surface. It is formed to protrude integrally with a substantially trapezoidal cross section toward the inner peripheral side (FIG. 5).

Next, the detailed structure of each part will be described. First, as shown in FIG. 6 and FIG.
1 and the diaphragm part 12 are simultaneously formed around the inner cylinder 10 with the same rubber material, but the dividing part 2 which keeps an interval in the axial direction.
It is divided by 0 in the axial direction.

The dividing portion 20 has a relatively large gap having a dimension G, and a diaphragm from the end of the main spring portion 11 at one end in the axial direction to the other end of the inner body 2 in a state before assembly. The length L0 to the end of the part 12 is longer by G than the same length L at the time of assembly (FIG. 4).

The dividing portion 20 is essential for simultaneously forming the main spring portion 11 and the diaphragm portion 12 in the same molding step, and is provided in a part of a pair of split dies 21 for opening the dividing portion 20 in a direction perpendicular to the axis. Due to the formed portion 22 formed to project in the axial direction, a side curved concave portion 23 facing the dividing portion 20 of the diaphragm portion 12, a first seal 24 on the diaphragm portion 12 side described later, and a second seal on the main spring portion 11 side 25 are integrally formed.

The side curved concave portion 23 is formed to have a depth in the axial direction that can be formed by the molded portion 22 that opens in a direction perpendicular to the axis with respect to relatively soft rubber, and is smaller than the depth when used as an actual diaphragm. It is shallow.

The main spring portion 11 and the diaphragm portion 12 except for the portion facing the dividing portion 20 are formed by a pair of slide dies 26 and 27 which are slidable in the axial direction, and eventually, the main spring portion 11 and the diaphragm portion are formed. The rubber portion 12 is formed by these split molds 21, 26 and 27.

The inner cylinder 10 is a cast product, and the inner peripheral portion of the shaft hole 28 formed substantially over the entire length excluding the small diameter portion 15 has a substantially elliptical shape, and the thickness of this portion is in the Y direction (front-back direction). Is thin,
The thickness is deviated with directionality so that the thickness in the X direction (left-right direction) is increased.

However, the outer diameter of the inner cylinder 10 and the outer diameter of the small-diameter portion 15 at the shaft hole 28 are both substantially circular.
The small-diameter shaft hole 29 formed in the axial center of the small-diameter portion 15 is also a perfect circle. A mounting shaft (not shown) is passed through these shaft holes 28 and 29.

The intermediate ring 13 provided on the main spring portion 11 is a metal tubular member, and is provided over the entire length of the main spring portion 11 in the axial direction. However, a narrowed portion 30 is formed by narrowing an opposing position sandwiching the inner cylinder 10 in the Y direction at the intermediate portion in the axial direction,
As is apparent from FIG. 5, the cross-section has a substantially elliptical shape with a different diameter.

A through-hole 31 is formed in the constricted portion 30, through which a part of the main spring portion 11 extends outside the constricted portion 30 to form a filling portion 32. This is a portion for simply filling the space between the throttle portion 30 and the outer cylinder 3 without much affecting the overall dynamic spring characteristics.

On the other hand, the inner cylinder 10 inside the throttle 30
A thin portion 33 having high spring stiffness is formed between these portions, and this portion is a portion that generates a high dynamic spring in the Y-direction vibration. However, the radius R1 (FIG. 7) from the axis to the outer peripheral portion of the main spring portion 11 as a whole is constant, and the entire outer shape of the main spring portion 11 itself including a portion that does not significantly affect the dynamic spring characteristics is substantially a perfect circle. It is in a state.

In the X direction of the main spring portion 11, the intermediate ring 13 is located at or near the outer diameter of the main spring portion 11, and the thickness of the rubber portion is increased. However, in this portion, the orifice passage 18 is formed so as to extend in the axial direction with a substantially 1/4 arc-shaped cross section. The orifice passage 18 is formed in a part of the slide die 27 by a protruding portion 27a that projects in the axial direction toward the slide die 26 (FIG. 7).

The outer peripheral portion of the inner cylinder 10 except for the small diameter portion 15 is covered with a rubber covering portion 34 which is continuous with the inner peripheral portions of the main spring portion 11 and the diaphragm portion 12.
5 is also covered with the extended end 34a of this portion.

The diaphragm portion 12 has a substantially perfect circular shape as seen from the axial direction of the inner cylinder 10, as is apparent from FIGS.
The outer sleeve 14 is also substantially circular. The diaphragm 35 constituting the diaphragm portion 12 is a substantially disk-shaped elastic thin film that connects the inner cylinder 10 and the outer peripheral sleeve 14 and protrudes in the radial direction.

When the diaphragm 35 is in the state of the interior body 2 before assembly, it does not exhibit a bent shape (FIG. 4) as in assembly, but extends substantially radially outward in a substantially flat plate shape over the entire circumference. It is formed continuously, and the initial outer diameter R2 (FIG. 7) from the center of the inner cylinder 10 to the outer circumference of the outer peripheral sleeve 14 at this time is larger than the outer diameter R1 of the main spring portion 11 (R1 < R
2).

As is apparent from FIG. 10, which is an enlargement of the portion B in FIG. 7, a first seal 24 protrudes outward in the radial direction and is integrated with an outer peripheral portion of the diaphragm portion 12 in the vicinity of the main spring portion 11. In addition, a second seal 25 is formed on the end face of the main spring portion 11 facing the diaphragm portion 12 so as to protrude integrally in the axial direction and is formed on the entire circumference.

As is clear from FIG. 8, the side wall 5 is formed of the same rubber as the main spring 11 and the diaphragm 12, and has a cylindrical shape so that the outer flange 4 and the flange 6 are spaced apart in the axial direction. And a wall rubber 40 for connection.

The wall rubber 40 connects the inner surface of the end of the outer flange 4 and the outer periphery of the press-fitting portion 7 of the flange fitting 6 so as to form a substantially U-shaped cross section. As shown in FIG. 10, a third seal 41 projects in the axial direction and is formed on the entire circumference at a portion which covers the innermost side of the end portion in the direction and as shown in FIG.

As shown in FIG. 11, the end of the wall rubber 40 which covers the outer periphery of the press-fitting portion 7 protrudes further in the axial direction than the tip of the press-fitting portion 7 and is formed so as to surround the entire circumference. A fourth seal 42 is formed.

A concave portion 43 for forming the main liquid chamber 16 is formed between the inner side of the wall rubber 40 and the outer peripheral side of the press-fitting portion 7, and the outer peripheral side of the wall rubber 40 is formed along the flange fitting 6. 44 and a portion 45 along the outer flange 4 and a recess 46 formed between both portions are formed, and the recess 46 serves to form a thin portion for facilitating the axial deformation of the wall rubber 40. ing.

A part of a portion 45 of the wall rubber 40 along the outer flange 4 is an outer peripheral covering portion 47 that covers the opposite side of the outer flange 4 and the outer peripheral portion of the outer cylinder 3. However, the outer peripheral covering portion 47 is formed intermittently at predetermined intervals in the circumferential direction.

A positioning metal fitting 50 for crimping is integrated on the outer flange 4 by welding. As shown in FIG. 9, the positioning metal fitting 50 at the time of crimping is composed of a pair of half members 51 formed in an axially symmetric and half-split shape, each of which has a flange portion 52 overlapping the outer flange 4 and an inner peripheral portion thereof. The semi-cylindrical portion 53 is bent at a substantially right angle on the side and overlaps the inner peripheral side of the outer cylinder 3.

Each of the positioning metal fittings 50 at the time of caulking has a plate-like member so as to form a substantially funnel-like shape fitted inside the outward flange 4 of the outer cylinder 3 when the respective halves 51 face each other. Formed by press molding,
Welded portion 54 formed concentrically on flange portion 52
Are integrated with the outer flange 4 by welding. Reference numeral 55 in FIGS. 8 and 9 denotes a joint end face between the adjacent flange portions 52.

In order to assemble this cylindrical liquid seal vibration isolator, first, in FIG.
The outer peripheral sleeve 14 is squeezed, and a radius R3 having a diameter smaller than the outer diameter R1 of the main spring portion 11 by about S from the initial radius R2.
About. Thereby, the diaphragm 35 is curved,
It is easy to bend and has a diaphragm shape with low spring property.

Next, the exterior body 1 and the interior body 2 are placed in a liquid tank, and the interior body 2 is inserted from the opening opposite to the side wall 6 of the exterior body 1 so that the small-diameter portion 15 side is at the top. Then, the small diameter portion 15 is press-fitted inside the press-fit portion 7.

The liquid in the outer cylinder 3 is pushed out of the press-fitting portion 7 into the liquid tank by the insertion of the main spring portion 11,
The outflow from the press-fitting portion 7 stops when the tip of 5 fits into the press-fitting portion 7, and is surrounded by one end surface of the main spring portion 11, the inner surface of the outer cylinder 3, the outer peripheral surface of the inner cylinder 10, and the side wall portion 5. A space having a volume substantially similar to the main liquid chamber 16 is formed.

At this time, since the outer peripheral sleeve 14 of the diaphragm portion 12 is narrowed, approximately S
A small gap is formed, and the gap communicates with the space before the main liquid chamber through the orifice passage 8.

Then, when the small diameter portion 15 of the inner cylinder 10 is further press-fitted into the press-fitting portion 7, it stops when the shoulder portion 15 a of the small diameter portion 15 abuts on the tip of the press-fitting portion 7 with the coating extension end 34 a interposed therebetween. A liquid chamber 16 is formed, and a contact portion between the main spring portion 11 and each end surface of the outer flange 4 and a contact portion between the shoulder portion 15a of the small-diameter portion 15 and the end surface of the press-fitting portion 7 are formed by the third seal 41 and the third seal 41, respectively. 4 seal 42.

In this press-fitting step, the excess liquid generated as the volume of the main liquid chamber is reduced toward the final volume is passed through the orifice passage 8 to the outer sleeve 14 of the diaphragm 12 and the outer cylinder 3. The liquid is quickly discharged into the liquid tank through the gap between them, and the liquid amount remaining inside the main liquid chamber 16 at the same time as the formation of the main liquid chamber 16 becomes a predetermined liquid amount.

Therefore, the exterior body 1 and the interior body 2 in this state are
Out of the liquid tank, and presses the diaphragm portion 12 in the axial direction toward the main spring portion 11 to discharge the liquid in the gap G and eliminate the gap G, and at the same time, the diaphragm portion 12 and the main spring body The outer cylinder 3 is secondarily narrowed from above so as to include the joint portion 11 to form the narrowed portion 8.

In this diaphragm, the outer cylinder 3 on the side of the main spring portion 11 is narrowed by about S, which is smaller than the general inner diameter, so that the outer diameter of the main spring portion 11 is the same as the outer diameter of the outer peripheral sleeve 14 of the diaphragm portion 12. The first seal 24 formed on the outer periphery of the diaphragm portion 12 is simultaneously brought into close contact with the inner surface of the throttle portion 8.

Subsequently, the opening end side of the outer cylinder 3 is moved inward by approximately 90 degrees.
゜ Fix and fix it so that it can be folded. As a result, a sub-frame in which the end surface of the diaphragm portion 12 is pressed against the end surface of the main spring portion 11 and the two joint end surfaces are tightly fixed with the second seal 42 sealed therebetween is assembled.

Next, the operation of the present embodiment will be described. As is apparent from FIG. 4, a main spring portion 11 whose middle portion has a different diameter cross section and a substantially circular diaphragm portion 12 are provided on a common inner cylinder 10.
And the outer diameter R3 of the outer peripheral sleeve 14 of the diaphragm portion 12 is smaller than the inner diameter (approximately R1) of the portion of the outer cylinder 3 where the main spring portion 11 is fitted. Since the excess liquid can be discharged from the gap provided in the tank, the amount of the sealed liquid in the main liquid chamber 16, which has a very significant effect on the performance of the cylindrical liquid seal vibration isolator, can be accurately controlled.

At this time, since the diaphragm portion 12 is separated from the main spring portion 11 by the dividing portion 20, the diaphragm portion 12 can be formed continuously over the entire circumference, and the diaphragm portion 12 is connected to the main spring portion 1
1 can be easily deformed and durable without affecting the dynamic spring characteristics.

In addition, by making the main spring portion 11 have different diameter cross sections, the spring rigidity can be changed mutually in two radial directions orthogonal to each other, and the diaphragm portion 12 can be formed into a substantially perfect circle which is preferable for maximum durability. Thus, it is possible to simultaneously provide the directionality in the spring rigidity and improve the durability.

Further, the first seal 24 formed on the outer periphery of the diaphragm portion 12 is
And the end face of the diaphragm portion 12 is pressed against the end face of the main spring portion 11 and the two seal end faces are sealed with the second seal 42. Therefore, even if the dividing portion 20 is formed, the seal can be surely made. it can.

The dividing portion 20 is used when the diaphragm portion 12 and the main spring portion 11 having different structures are formed at once in the same process on the common inner cylinder 10 using the common forming dies 21, 26 and 27. Indispensable at this time,
By the forming part 22 of, even the side curved concave part 23 can be integrally formed.

Moreover, when the main spring portion 11 is formed of an elastic body, the intermediate ring 13 having a substantially elliptical cross section is insert-molded. Therefore, the thickness of the elastic member between the inner ring 10 and the inner ring 10 surrounded by the intermediate ring 13 is formed. Due to the thickness change, the main spring 11
The spring rigidity can be easily changed in two directions orthogonal to the radial direction in the cross section perpendicular to the axis, for example, by hardening the Y direction (front-rear direction) where the thin-walled portion 33 is formed, and by approximately 90 ° in the circumferential direction. By forming the orifice passage 18 as a hole that penetrates through the thickness of the main spring portion 11 in the axial direction in the difference portion, the X direction (left-right direction) can be softened.

In addition, since the stopper portion 19 protruding from the outer peripheral side is provided in the orifice passage 18, the spring rigidity in the X direction can be easily adjusted by the amount of protrusion of the stopper portion 19.

Furthermore, the positioning metal fitting 50 is laminated on the outer flange 4 of the outer cylinder 3 to insert the inner cylinder 10 and the intermediate ring 13 into the outer cylinder and assemble them by caulking. Since the end surface projecting into the outer cylinder 3 abuts on the axial end surface of the intermediate ring 13 and positions the same, the intermediate ring 13 and the diaphragm portion 12 are accurately positioned in the axial direction of the inner cylinder 10 and the Since the dispersion is small and the change in the amount of the sealed liquid is small, the quality is stable. In addition, since the positioning metal fitting 50 at the time of caulking is composed of a pair of halves 51 which form a substantially funnel shape when combined, each half 51
Can be easily formed from a plate-like member by press molding.

Further, according to the assembling method of this embodiment, a gap is formed between the periphery of the diaphragm portion 12 and the outer cylinder 3, and the end of the outer cylinder 3 overlapping the diaphragm portion 12 after the main liquid chamber 16 is formed. Since the gap is sealed by forming the squeezed portion 8 by squeezing the portion, the surplus liquid can be quickly discharged from the gap to make the amount of the sealed liquid accurate.

At this time, the initial outer diameter R of the outer peripheral sleeve 14 is
2 is formed to be larger than the inner diameter R1 of the outer cylinder 3, and the inner body 2 is squeezed to an inner diameter R3 smaller than the inner diameter R1 of the outer cylinder 3 before the outer body 1 is inserted into the outer body 1. The gap between the cylinders 3 can be easily formed, and the diaphragm 35 can be greatly curved in the radial cross section so as to be easily deformed by narrowing the diaphragm portion 12. In this case, the curved concave portion 23 is formed in advance. The formation of this curved portion can be further facilitated.

Further, after the outer cylinder 3 around the outer peripheral sleeve 14 is squeezed, one end of the outer cylinder 3 is fixed by caulking so that the diaphragm portion 12 is pressed against the main spring portion 11.
The diaphragm portion 12 can be finally brought into close contact with the main spring portion 11, and the opening between the diaphragm portion 12 and the main spring portion 11 due to the contraction, which tends to occur when the caulking is performed before the outer cylinder 3 is contracted, is formed. Can be prevented.

The present invention is not limited to the above-described embodiment, but can be variously modified. For example, the diaphragm 12 is formed completely separately from the main spring portion 11 and is fitted onto the inner cylinder 10 later. However, in this case, the material may be different. The orifice passage 18 may be a groove formed in the outer peripheral surface of the main spring portion 11 in the axial direction and forming a passage with the outer cylinder 3. Further, the application is not limited to the subframe, and various types of cylindrical vibration dampers known for vehicles can be used.

[Brief description of the drawings]

FIG. 1 is a view showing a process of assembling a subframe according to an embodiment in cross section of each component.

FIG. 2 is an external side view of the subframe.

FIG. 3 is a plan view (a view in the direction of arrow A in FIG. 2).

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along the line 5-5 in FIG. 2;

6 is a view in the direction of arrow C in FIG. 7;

FIG. 7 is a cross-sectional view of the interior body at a difference of 90 ° along the axial direction.

FIG. 8 is a cross-sectional view of the exterior body along the axial direction.

9 is a view showing a flange portion of the outer cylinder from a direction indicated by an arrow F in FIG. 8;

10 is a partially enlarged view of a portion B shown in FIG. 7;

11 is a partially enlarged view of a portion D shown in FIG.

12 is a partially enlarged view of a portion E shown in FIG.

[Explanation of symbols]

1: exterior body, 2: interior body, 3: outer cylinder, 5: side wall, 7:
Press-in section, 8: throttle section, 9: caulking section, 10: inner cylinder, 1
1: Main spring part, 12: Diaphragm part, 13: Intermediate ring, 14: Outer peripheral sleeve, 15: Small diameter part, 16: Main liquid chamber, 17: Sub liquid chamber, 18: Orifice passage, 19: Stopper part, 20: Splitting part, 35: diaphragm, 50: positioning metal fitting for crimping, 51: half body

Claims (11)

[Claims] An inner cylinder, an outer cylinder formed coaxially around the inner cylinder, a main spring portion made of an elastic member provided between the inner and outer cylinders, and an axially attached one end of the inner and outer cylinders. A side wall portion that forms a main liquid chamber between the main spring portion, and a sub-liquid chamber that is attached between the other ends of the inner and outer cylinders in the axial direction and forms a sub-liquid chamber between the main spring portion and a thin film that is easily elastically deformed. In a cylindrical liquid seal vibration isolator provided with a diaphragm portion having a diaphragm and an orifice passage formed in an axial direction of the main liquid chamber so as to communicate with the main liquid chamber and the sub liquid chamber, a main spring portion is provided. The diaphragm part is formed by dividing it, and the diaphragm is formed continuously around the entire circumference, and the outer diameter of the diaphragm part is made smaller than the maximum inner diameter of the part where the main spring part of the outer cylinder is fitted. A cylindrical liquid ring vibration isolator. 2. The liquid-vibration isolator according to claim 1, wherein the main spring portion has at least an intermediate portion in the axial direction having a different diameter cross section, and the diaphragm has a substantially perfect circular shape. . 3. A double seal structure wherein a first seal portion for sealing between the outer cylinder and the outer cylinder is provided on an outer peripheral portion of the diaphragm portion, and a second seal portion is provided between the diaphragm portion and the main spring portion. 2. The cylindrical liquid seal vibration isolator according to claim 1, wherein: 4. The cylindrical liquid seal according to claim 1, wherein the main spring portion is formed by insert-molding a cylindrical intermediate ring having a substantially elliptical cross section in a direction perpendicular to the axis into an elastic member. Anti-vibration device. 5. The orifice passage is constituted by a through-hole penetrating in the axial direction through the thickness of the thick portion formed inside the substantially elliptical intermediate ring of the main spring portion, and the inner periphery of the through-hole. The cylindrical liquid seal vibration isolator according to claim 4, wherein a stopper portion protruding from the side or the outer peripheral side to the opposite side is integrally formed. 6. The side wall portion has a substantially funnel-shaped crimping positioning fitting fitted into one end opening of the outer cylinder, and the crimping positioning metal fitting is formed by lamination with a plate-like member. 2. The cylindrical liquid seal vibration isolator according to 1. 7. The liquid-vibration isolator according to claim 6, wherein the positioning metal fitting at the time of crimping is constituted by a pair of press parts which are divided in half in the circumferential direction. 8. An exterior body comprising an outer cylinder and a side wall attached to one end of the outer cylinder, wherein at least an intermediate portion in the axial direction has a different diameter cross section around the inner cylinder, and a maximum outer diameter is equal to an inner diameter of the outer cylinder. Forming an inner body having a diaphragm part that is substantially circular with a substantially similar main spring part and whose outer diameter is smaller than the inner diameter of the outer cylinder,
After inserting the inner body into the outer body in the liquid from the open end side, one end of the inner cylinder and the side wall are press-fitted to form a main liquid chamber between the side wall and the main spring. In addition, a sub liquid chamber communicating with the main liquid chamber and the orifice passage is formed between the main spring part and the diaphragm part, and then a part of the outer cylinder is drawn to seal the outer peripheral part of the diaphragm part. A method for producing a cylindrical liquid-sealed vibration isolator. 9. The inner body has a pair of slide slidable in the axial direction of the inner cylinder, and open / closed in a direction orthogonal to the axis, outer peripheral sides of the main spring portion and the diaphragm portion, and adjacent ends of the main spring portion and the diaphragm portion. 9. The method for producing a cylindrical liquid seal vibration isolator according to claim 8, wherein the molding is performed by an opening / closing die that forms a gap between divided portions. 10. The diaphragm portion has an outer peripheral sleeve on the outer peripheral portion having a diameter larger than the inner diameter of the outer cylinder, and before the outer sleeve is fitted into the outer cylinder, the initial aperture is reduced to be smaller than the inner diameter of the outer cylinder. 9. The method for producing a cylindrical liquid-sealed vibration isolator according to claim 8, wherein: 11. The diaphragm according to claim 10, wherein after the outer cylinder around the outer peripheral sleeve is drawn, the end of the outer cylinder is fixed by caulking so as to press the diaphragm toward the main spring. Manufacturing method of a cylindrical liquid ring vibration isolator.