JP3456407B2 - Manufacturing method of liquid filled type vibration damping device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a vibration damping effect by a liquid column resonance action caused by a liquid flowing through an orifice passage formed inside a rubber elastic body and connecting a first liquid chamber and a second liquid chamber. The present invention relates to a method for manufacturing a liquid filled type vibration damping device.

[0002]

2. Description of the Related Art As a liquid-filled type vibration damping device of this type,
For example, those shown in FIGS. 1 to 3 are known. In this vibration isolator, an intermediate metal fitting 12 is provided so as to surround the inner cylindrical metal fitting 11 and have an axial direction parallel to the axial direction of the inner cylindrical metal fitting. The inner cylindrical metal fitting 11 and the intermediate metal fitting 12 are vulcanized and bonded by a rubber elastic body. 20. The inner tubular metal fitting 11 is connected integrally with the intermediate metal fitting 20 in the opposite direction of the main vibration input (downward in the drawing).
It is arranged eccentrically. The intermediate metal fitting 12 is formed by punching and bending a thin metal plate.
As shown in FIG. 4, a pair of ring portions 1 is provided at both ends in the axial direction.
A long plate-like member having a predetermined width, which has three and fourteen, and is arranged between both ring portions 13 and 14 at a substantially symmetrical position in the circumferential direction to be slightly indented in the radial direction and parallel to the axial direction to connect the two. 2 has a pair of connecting portions 15 and 16, and window portions 17 and 18 are formed between the connecting portions 15 and 16.

The rubber elastic body 20 has a seal portion 21 fixed to the outer periphery of the intermediate metal fitting 12, and a side wall between the ring portions 13 and 14 and the inner tubular metal fitting 11 on the side of the one window portion 17 of the connecting portions 15 and 16. The parts 22a and 22b are provided. Side wall portions 22a, 2
A first recess 23 that opens to the window 17 is provided between the 2b. A second concave portion 24 that opens to the window portion 18 is provided in the rubber portion of the first concave portion 23 on the opposite side of the inner tubular metal member 11 with the inner tubular metal member 11 interposed therebetween. A slit 24a is formed in the rubber portion between the second recess 24 and the inner tubular member 11, and a thin diaphragm film (flexible film) 25 is formed outside the slit 24a.

Further, on the outer periphery of the tubular vulcanization molded article 10,
The outer cylindrical metal fitting (bracket) 30 is fitted by press fitting or the like. The outer cylindrical metal fitting 30 is coaxially arranged on the outer side of the intermediate metal fitting 12 with the seal portion 21 interposed therebetween, and the first recess 23
And the opening of the second recess 24 is liquid-tightly closed to close the first recess 2
A first liquid chamber 26 and a second liquid chamber 27 are formed between the third liquid chamber 26 and the second recess 24. First liquid chamber 26 and second liquid chamber 27
Is filled with a liquid such as water, and communicates with each other via orifice passages 28 and 29 provided between the outer cylindrical metal fitting 30 and the connecting portions 15 and 16.

This liquid-filled type vibration damping device is manufactured by integrally vulcanizing and molding the inner tubular metal member 11, the intermediate metal member 12 and the rubber elastic body 20 to form the tubular vulcanization molding shown in FIGS. 5 and 6. The product 10 is formed, and then the tubular vulcanization molded product 10 is pressed into the outer cylindrical metal fitting 30 by a pressing jig, or the outer cylindrical metal fitting 30 is drawn around the outer periphery of the tubular vulcanization molded product 10. It is done by fixing with.

In this liquid-filled type vibration damping device, for example, the inner tubular metal fitting 11 is connected to a support member on the vehicle body side, and a mounting portion (not shown) provided on the outer cylindrical metal fitting 30 is provided on the support member on the engine side. The first liquid chamber 26 and the second liquid chamber 27 are arranged so as to correspond to each other in the vertical direction, which is the main vibration input direction of the engine. For this reason,
The liquid-filled type vibration damping device, when mounted, is subjected to an initial load due to the weight of the engine or the like, the outer cylindrical metal fitting 30 moves downward with respect to the inner tubular metal fitting 11, and the inner tubular metal fitting 11 moves to the intermediate metal fitting 12. Is approximately the axial center position of. Then, when vehicle vibration occurs between the inner cylindrical metal member 11 and the outer cylindrical metal member 30, the elastic action of the rubber elastic body 20 and the orifice passages 28, 29.
The vibration is effectively damped by the liquid column resonance action of the liquid flowing in the column.

By the way, in the liquid-filled type vibration damping device, in the mounted state, the rubber elastic body 2 is subjected to the initial load.
Since 0 remains in a deformed state, its durability may be impaired. In order to avoid such defects,
When the outer cylindrical metal fitting 30 is attached to the outer periphery of the tubular vulcanized molded product 10 by drawing, the inner tubular metal fitting 11 is attached to the intermediate metal fitting 1.
2 is attached in an offset state in which it is forcibly moved to the position of approximately 2 axis. On the other hand, when the tubular vulcanization molded product 10 is fixed to the inner circumference of the outer cylindrical metal fitting 30 by press fitting, the first thin film diaphragm 25 of the rubber elastic body 20 is suppressed while pressing the first member. A liquid is filled in the liquid chamber 26 and the second liquid chamber 27. As a result, the insides of the first liquid chamber 26 and the second liquid chamber 27 are slightly negative pressure than the atmospheric pressure, and the deformation of the rubber elastic body 20 due to the initial load at the time of mounting can be suppressed in advance. The durability of 20 is ensured.

[0008]

However, the operation of pressing the thin diaphragm film 25 at the time of press-fitting is not preferable for maintaining the reliability of the diaphragm film 25, and is not particularly suitable as a measure for mass production. On the other hand, when the outer cylindrical metal fitting 30 is press-fitted onto the outer periphery of the tubular vulcanization molded product 10, if the inner tubular metal fitting 11 is forced to be in the offset state as used in the drawing process, the sealing portion 21 Since the rubber elastic body is partially subjected to excessive press-fitting resistance stress, it is difficult to make the inner tubular metal member 11 in the offset state in the case of press-fitting. That is, as a method of inserting the tubular vulcanization molded product into the inside of the outer cylindrical metal fitting, the method by press fitting does not require expensive equipment for drawing like the method of drawing the outer cylindrical metal fitting. Although it is a simple method, it has been difficult to use it for manufacturing a liquid-filled type vibration damping device of a type that requires a negative pressure state in the liquid chamber for the above reason.

The present invention is intended to solve the above-mentioned problems, while maintaining the reliability of the rubber elastic body when the tubular vulcanization molded article is inserted into the outer cylindrical metal fitting by press fitting. It is another object of the present invention to provide a method for manufacturing a liquid-filled type vibration damping device that can easily bring a liquid chamber into a negative pressure state with respect to atmospheric pressure.

[0010]

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 claim 1 is that the inner cylindrical metal member and the axial direction of the inner cylindrical metal member are surrounded by the inner cylindrical metal member. A cylinder that is parallel to the axial direction of the tubular fitting, has a pair of ring parts at both ends in the axial direction, and has a plurality of plate-shaped connecting parts that connect the pair of ring parts, and has a window part on the outer circumference. -Shaped intermediate metal fitting, and a cylindrical rubber elastic body that connects the intermediate metal fitting and the inner tubular metal fitting, and the rubber elastic body is partially formed with a concave portion that opens to the window portion, thereby A pair of side walls arranged on both sides in the axial direction, a flexible film connecting a pair of ring parts on the opposite sides of the inner tubular metal part of the recess, and a seal part fixed to the outer periphery of the intermediate metal fitting. And the tubular vulcanization molded article are integrally formed, and the tubular vulcanization molded article is placed in a liquid and The outer cylindrical metal fitting closes the opening of the recess in a liquid-tight manner to form a first liquid chamber filled with the liquid by press-fitting into the portion through the seal portion, and at the same time, the flexible film and the outer portion are formed. A liquid-filled type in which a second liquid chamber filled with liquid is formed between the cylindrical metal fittings, and at the same time, an orifice passage for communicating the first liquid chamber and the second liquid chamber is formed between the outer cylindrical metal fitting and the connecting portion. A method for manufacturing an anti-vibration device, comprising applying an axial load to the side wall portion on the press-fitting end side on the press-fitting end side of the tubular vulcanized molded product before at least the opening of the recess is substantially closed. This is to fill the inside of the recess with liquid in a state where the side wall portion is elastically deformed toward the inside of the recess to form the first liquid chamber and the second liquid chamber, and to release the axial load.

In the invention according to claim 1 configured as described above, at least before the opening of the recess is substantially closed, the axial load is applied to the side wall portion of the tubular vulcanized molded product on the press-fitting end side. In addition, since the liquid is filled in the first liquid chamber and the second liquid chamber in a state in which the thick side wall is elastically deformed toward the inside of the recess, the first liquid chamber is not damaged without damaging the side wall rubber. Also, the inside of the second liquid chamber can be brought to a slightly negative pressure state below atmospheric pressure.

As a result, according to the first aspect of the invention, when the liquid-filled type vibration damping device is mounted on the vehicle, the outer cylindrical metal member is moved downward with respect to the inner cylindrical metal member by applying an initial load such as an engine. The second metal chamber and the second liquid chamber are kept at a pressure slightly lower than the atmospheric pressure, so that the rubber against the initial load at the time of mounting is attached. The deformation of the elastic body can be suppressed in advance, and the durability of the rubber elastic body can be ensured.

Further, the structural feature of the invention according to claim 2 is that in the method for manufacturing a liquid filled type vibration damping device according to claim 1, a tubular pressing portion for pushing the intermediate metal fitting at one end, At the other end of the tubular pressing portion, a thick plate-shaped pressing plate portion that is axially movable to the tubular pressing portion by a predetermined distance and is non-pullable, and a cylinder attached to the inner surface of the pressing plate portion. -Shaped pressing portion including a rod-shaped rubber pressing portion protruding to one end side, and a spring member interposed between the cylindrical pressing portion and the pressing plate portion to urge the pressing plate portion outward in the axial direction. When a tubular vulcanization molded product is press-fitted into the outer cylindrical metal fitting by using a jig, the rubber pushing portion applies an axial load to the side wall portion on the press-fitting end side.

In the invention according to claim 2 configured as described above, when the tubular pressing portion is pressed against the intermediate fitting, the pressing plate portion presses the spring member and the spring member is elastically deformed. With a low pressure due to the elastic deformation of the spring member, the rubber pressing portion applies an axial load to the side wall portion of the tubular vulcanized molded product at the press-fitting end side to elastically deform the thick side wall portion toward the inside of the recess. In this state, the tubular vulcanization molded product is press-fitted into the outer cylindrical metal fitting. Then, before the openings of the first concave portion and the second concave portion are substantially closed, the tubular vulcanized molded article is press-fitted with high pressure,
The liquid is filled in the first liquid chamber and the second liquid chamber in a state where the side wall portion is elastically deformed toward the inside of the recess, and as a result, the first liquid chamber and the second liquid chamber interior without damaging the side wall portion. Can be brought to a slightly negative pressure state than atmospheric pressure.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIGS. 7 and 8 show the tubular vulcanization molded product 10 of the liquid filled type vibration damping device according to the embodiment. FIG. 3 is a side view and a cross-sectional view showing a pressing jig 40 used for press-fitting into the outer cylindrical metal fitting 30.

The pressing jig 40 includes a metallic cylindrical pressing portion 41 and a pressing plate portion 4 attached to one end of the cylindrical pressing portion 41.
2 and a coil spring (spring member) 47. The cylindrical pressing portion 41 is provided with a ring-shaped engagement convex portion 41a on the inner side in the radial direction by cutting out approximately half in the radial outer side at one end side (tip portion). Engagement protrusion 4
The outer diameter of 1a is equal to the ring portions 13 and 14 of the intermediate fitting 12.
Is slightly smaller than the inner diameter of the cylindrical vulcanization molded article 10, and when the cylindrical vulcanization molded product 10 is pushed, the engaging convex portion 41a is
It is adapted to be fitted in the inside of the No. 4. Cylindrical pressing part 4
On the other end side of 1 is a ring-shaped collar portion 4 protruding from the inner peripheral surface.
1b is provided. The inner diameter of the collar portion 41b is slightly larger than the outer diameter of the adjusting plate member 44 described later.
Further, recesses 41c for mounting the coil springs 47 are formed at a plurality of locations on the other end side surface of the tubular pressing portion 41.

The pressing plate portion 42 has an outer plate member 43, an adjusting plate member 44, and an inner plate member 45. The outer plate member 43 has substantially the same outer diameter as that of the tubular pressing portion 41, is provided with a mounting hole 43a for inserting a bolt in the center, and faces the concave portion 41c on the surface facing the tubular pressing portion 41. A recess 43b for mounting the coil spring 47 is provided. The adjustment plate member 44 is formed by stacking a plurality of metal plates, and has an outer diameter slightly smaller than the inner diameter of the collar portion 41b.
A mounting hole 44a is provided at the center. The adjusting plate member 44 is
By changing the number of metal plates, the rubber pushing portion 4 described later.
The pushing amount of 6 can be adjusted. The inner plate member 45 is provided with a mounting hole 45a having an outer diameter smaller than the inner diameter of the cylindrical pressing portion 41 and having a thread groove at the center, and a rubber rod-shaped rubber protruding vertically to the outer peripheral side of the outer side surface (lower side surface in the drawing). The pushing part 46 is integrally provided.

To assemble the pressing jig 40, the coil springs 47 are mounted in the plurality of recesses 41c of the cylindrical pressing portion 41, and the inner plate member 45 is inserted into the inside from one end side of the rubber pressing portion 46 toward the one end side. Then, the adjustment plate member 44 and the outer plate member 43 are superposed on the inner plate member 45 from the other end of the cylindrical pressing portion 41, and the coil spring 47 is attached to the recess 43 b of the outer plate member 43. Further, by inserting a bolt 48 into the mounting hole 43a of the outer plate member 43 and the mounting hole 44a of the adjustment plate member 44 and screwing the bolt 48 into the mounting hole 45a of the inner plate member 45, the pressing plate portion 42 is pushed. Then, the pressing jig 40 is assembled.

As a result, the pressing plate portion 42 is urged outward in the axial direction of the cylindrical pressing portion 41 by the coil spring 47, and the inner plate member 45 engages with the flange portion 41b of the cylindrical pressing portion 41. It is prevented by this. Then, by pressing the pressing plate portion 42 with the tubular pressing portion 41 fixed, the pressing plate portion 42 is moved to the coil spring 4 as shown in FIG.
7 is pushed until it is completely contracted, whereby the rubber pushing portion 46 of the pushing plate portion 42 largely projects from the one end side of the tubular pushing portion 41.

Next, the operation of the above embodiment will be described.
As shown in FIG. 10, the tubular vulcanization molded product 10 and the outer cylindrical metal fitting 30 are coaxially aligned, and one end of the tubular pressing portion 41 of the pressing jig 40 is placed in the middle of the tubular vulcanization molded product 10. Hit the metal fitting 12 and push. As a result, the pressing plate portion 42 causes the coil spring 4 to
7, the coil spring 47 is elastically deformed. Due to the elastic deformation of the coil spring 47, the rubber pushing portion 46 projects from the tubular pressing portion 41, and a low axial load of about 200 to 1000 N is applied to the side wall portion 22a of the tubular vulcanized molded product 10 on the press-fitting end side. Add. When the axial load is applied, the thick side wall portion 22a elastically deforms toward the inside of the first recess 23, and in this state, the tubular vulcanized molded product 10 is press-fitted into the outer cylindrical metal fitting 30.

Then, before the openings of the first recess 23 and the second recess 24 are substantially closed, the pressing jig 40 is used to
The intermediate metal fitting 12 of the tubular vulcanization molded product 10 is pushed by a high pressure of 000 to 10,000 N, and the tubular vulcanization molded product 10 is press-fitted and attached to the outer cylindrical metal fitting 30. Thereby, the side wall portion 22
In the state where the thick side wall 22a is elastically deformed toward the inside of the first recess 23 by applying an axial load to a, the first recess 23
The liquid is filled in the second recess 24, and the first liquid chamber 26 and the second liquid chamber 27 are formed. Therefore, the rubber pushing part 4
By releasing the axial load by 6, the first liquid chamber 2
6 and the inside of the second liquid chamber 27 can be brought to a state of slightly negative pressure than the atmospheric pressure. Further, since the side wall portion 22a is thick, it is not damaged even if it is pushed by the rubber pushing portion 46.

As a result, when the liquid-filled type vibration damping device is mounted on the vehicle, the outer cylindrical metal fitting 30 moves downward with respect to the inner cylindrical metal fitting 11 due to an initial load such as engine weight being applied. The tubular metal fitting 11 is arranged at a substantially axial center position of the intermediate metal fitting 12, but since the insides of the first liquid chamber 26 and the second liquid chamber 27 are slightly negative pressure from the atmospheric pressure, the initial load at the time of mounting is set. The deformation of the rubber elastic body 20 due to the above can be suppressed in advance, and the durability of the rubber elastic body 20 can be ensured.

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, and other forms may be used. In particular, as for the outer shape of the outer cylindrical metal fitting, any shape may be used as long as it has a circular hole into which the tubular vulcanization molded product can be inserted by press fitting. In addition, the liquid-filled type vibration damping device of the present invention can be used for other than vehicles.

[Brief description of drawings]

FIG. 1 is a front view showing a liquid filled type vibration damping device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the liquid-filled type vibration damping device taken along line II-II shown in FIG.

FIG. 3 is a sectional view of the liquid-filled type vibration damping device taken along line III-III in FIG.

FIG. 4 is a side view showing an intermediate fitting used in the liquid-filled type vibration damping device.

FIG. 5 is an axial cross-sectional view showing a tubular vulcanization molded product used in the liquid-filled type vibration damping device.

6 is a cross-sectional view of the same tubular vulcanization molded product taken along line VI-VI shown in FIG.

FIG. 7 is a front view showing a pressing jig used for manufacturing the liquid-filled type vibration damping device.

FIG. 8 is a sectional view showing the pressing jig.

FIG. 9 is a cross-sectional view showing a state where a pressing plate portion of the pressing jig is pressed.

FIG. 10 is an explanatory diagram illustrating a step of press-fitting a tubular vulcanization molded product into an outer cylindrical metal fitting using a pressing jig.

[Explanation of symbols]

11 ... Inner cylinder metal fitting, 12 ... Intermediate metal fitting, 13, 14 ... Ring part, 15, 16 ... Connection part, 20 ... Rubber elastic body, 21 ... Seal part, 22a, 22b ... Side wall part, 23 ... 1st recessed part, 2
4 ... 2nd recessed part, 25 ... Diaphragm film, 26 ... 1st liquid chamber, 27 ... 2nd liquid chamber, 28, 29 ... Orifice passage, 3
0 ... Outer cylindrical metal member, 33 ... Window portion, 40 ... Pressing jig, 4
DESCRIPTION OF SYMBOLS 1 ... Cylindrical pressing part, 41a ... Engagement convex part, 41b ... Collar part, 4
1c ... Recessed portion, 42 ... Pressing plate portion, 43 ... Outer plate member, 44 ...
Adjustment plate member, 45 ... Inner plate member, 46 ... Rubber pushing portion, 4
7 ... Coil spring, 48 ... Bolt.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16F 13/00-13/30 B60K 5/12 B29C 67/00

Claims (2)

(57) [Claims] 1. An inner tubular metal fitting, an axial direction surrounding the inner tubular metal fitting being parallel to an axial direction of the inner tubular metal fitting, having a pair of ring portions at both ends in the axial direction, and between the pair of ring portions. A tubular intermediate metal fitting having a plurality of plate-shaped connecting portions for connecting the above and a window portion on the outer periphery, and a tubular rubber elastic body connecting the intermediate metal fitting and the inner tubular metal fitting. The rubber elastic body is provided with a pair of side wall portions arranged on both sides in the axial direction of the concave portion by forming a concave portion opening to the window portion, and the inner tubular metal member of the concave portion. A tubular vulcanization molded article provided integrally with a flexible film that connects the pair of ring portions on opposite sides of the sandwich and a seal portion that is fixed to the outer periphery of the intermediate fitting is integrally formed. In the above, the tubular vulcanization molded article is press-fitted into the outer cylindrical metal fitting through the seal portion, whereby the outer cylindrical Thereby forming a first fluid chamber filled with a liquid therein to close the opening of the recess liquid-tight manner by fitting,
A second liquid chamber filled with a liquid is formed between the flexible film and the outer cylindrical metal fitting, and at the same time, the first liquid chamber and the second liquid chamber are provided between the outer cylindrical metal fitting and the connecting portion. A method for manufacturing a liquid-filled type vibration damping device that forms an orifice passage that communicates with each other, wherein the press-fitting end side of the tubular vulcanization molded article is at least before the opening of the recess is substantially closed, An axial load is applied to the side wall portion on the press-fitting end side so that the side wall portion is elastically deformed toward the inside of the recess to fill the inside of the recess with a liquid, thereby forming the first liquid chamber and the second liquid chamber. A method for manufacturing a liquid-filled type vibration damping device, characterized in that it is formed to release the axial load. 2. The method for manufacturing a liquid-filled type vibration damping device according to claim 1, wherein a tubular pressing portion that pushes the intermediate metal fitting at one end, and a tubular pressing portion at the other end of the tubular pressing portion. A thick plate-shaped pressing plate portion that is axially movable by a predetermined distance in the pressing portion and is non-pullable, and is attached to the inner side surface of the pressing plate portion and protrudes to one end side of the tubular pressing portion. A pressing jig including a rod-shaped rubber pressing portion and a spring member interposed between the cylindrical pressing portion and the pressing plate portion to urge the pressing plate portion outward in the axial direction is used. Of a liquid-filled type vibration damping device, characterized in that, when a cylindrical vulcanization molded article is press-fitted into the outer cylindrical metal fitting, an axial load is applied to the side wall portion on the press-fitting end side by the rubber pressing portion. Production method.