JP2004218683A - Liquid seal type vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid seal type vibration damper capable of preventing errors in assembly of a first orifice forming member and a second orifice forming member to an intermediate cylinder. <P>SOLUTION: In the liquid seal type vibration damper, a first fitting end portion 32 of a first orifice forming member 31 is fitted to a first fitting recessed portion of an intermediate cylinder 16, a second fitting end portion 34 is fitted to a second fitting recessed portion 35, a third fitting end portion 38 of a second orifice forming member 37 is fitted to a third fitting recessed portion 39, and a fourth fitting end portion 40 is fitted to a fourth fitting recessed portion 41. The first fitting end portion 32, the second fitting end portion 34, the third fitting end portion 38, and the fourth fitting end portion 40, and the first fitting recessed portion 33, the second fitting recessed portion 35, the third fitting recessed portion 39, and the fourth fitting recessed portion 41 are formed so that the first fitting end portion 32, the second fitting end portion 34, the third fitting end portion 38, and the fourth fitting end portion 40 are not respectively fitted to other fitting recessed portions not to be fitted. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, an anti-vibration base made of a rubber-like elastic body is interposed between an inner cylinder and an intermediate cylinder surrounding the inner cylinder, and the intermediate cylinder is internally fitted to an outer cylinder, and is located with the anti-vibration base interposed therebetween. A pair of liquid chambers and an orifice for communicating the two liquid chambers are formed, a pair of ring portions for pressing the intermediate cylinder against the outer cylinder, and vulcanizing the rubber-like elastic body by connecting the two ring portions to each other. It consists of a pair of connecting walls to be bonded,
A first fitting recess is formed at one end in the width direction of one connecting wall, and a second fitting recess is formed at one end in the width direction of the other connecting wall, and the other end in the width direction of the one connecting wall. A third fitting recess is formed on the other side, and a fourth fitting recess is formed on the other end side in the width direction of the other connecting wall, and one end of the first orifice forming member formed in an arc shape to form the orifice. Of the second orifice forming member formed in an arc shape by fitting the first fitting end of the second side into the first fitting recess and the second fitting end of the other end into the second fitting recess. A third fitting end on one end side is fitted in the third fitting recess, and a fourth fitting end on the other end side is fitted in the fourth fitting recess. The present invention relates to a liquid filled vibration isolator in which an orifice groove communicates with a second orifice groove of the second orifice forming member.
[0002]
[Prior art]
When manufacturing this type of liquid filled type vibration damping device, the first orifice forming member and the second orifice forming member are attached to the intermediate cylinder in the liquid, and the integrated first and second orifice forming members / intermediate cylinder are assembled. It is manufactured by inserting the outer cylinder in the liquid and reducing the diameter of the outer cylinder.
[0003]
The liquid-filled type vibration damping device thus obtained is provided, for example, between a suspension member of an automobile and a differential mechanism and the like, and elastically deforms a rubber-like elastic body by input of vibration, so that the volume of both liquid chambers is increased. The liquid is caused to flow in accordance with the change, and an excellent vibration damping effect is exhibited by the flow effect.
[0004]
Conventionally, the first orifice forming member and the second orifice forming member are both formed in an arc shape and have substantially the same size. Then, the first to fourth fitting ends can be fitted into any of the first to fourth fitting recesses.
[0005]
[Problems to be solved by the invention]
According to the above conventional configuration, the first orifice forming member and the second orifice forming member are interchanged, and their fitting ends are fitted into the fitting concave portions of the intermediate cylinder, or the first orifice forming member (or the In some cases, the first fitting end and the second fitting end of the (2 orifice forming member) are reversed and fitted into the first fitting recess and the second fitting recess.
[0006]
As a result, there is a problem that the first orifice groove of the first orifice forming member and the second orifice groove of the second orifice forming member do not communicate with each other, resulting in a defective product.
[0007]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a liquid-filled type vibration damping device that can prevent a mistake in assembling a first orifice forming member and a second orifice forming member to an intermediate cylinder. It is in.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, in the liquid filling type vibration damping device described at the beginning, the first fitting end, the second fitting end, the third fitting end, and the fourth fitting end are provided. Out of the first fitting concave portion, the second fitting concave portion, the third fitting concave portion, and the fourth fitting concave portion, so as not to be fitted to another three fitting concave portions which are not the fitting targets. A first fitting end, a second fitting end, a third fitting end, a fourth fitting end, and the first fitting recess, the second fitting recess, the third fitting recess, and the third fitting recess. 4 in that a fitting recess is formed.
[0009]
With this configuration, the first and second fitting ends of the first orifice forming member can be reversed and fitted into the first and second fitting recesses, or the third fitting recess can be formed. And the fourth fitting recess, and the first fitting end and the second fitting end are reversed so that the third fitting recess and the fourth fitting recess cannot be fitted. .
[0010]
In addition, the third and fourth fitting ends of the second orifice forming member are reversed so as to be fitted into the third and fourth fitting recesses, It becomes impossible to fit into the 2nd fitting recess, and to fit into the 1st fitting recess and the 2nd fitting recess by inverting the 3rd fitting end and the 4th fitting end.
[0011]
In other words, unless the first fitting end and the second fitting end are individually fitted into the first fitting recess and the second fitting recess to be fitted with each other, the first orifice forming member is in the middle. It cannot be mounted on the cylinder. Similarly, as long as the third fitting end and the fourth fitting end are not separately fitted into the third fitting recess and the fourth fitting recess to be fitted with each other, the second orifice forming member is It cannot be mounted on the intermediate cylinder.
[0012]
According to a second aspect of the present invention, in the first aspect of the present invention, the first fitting concave portion and the third fitting concave portion have the same width and the same position in the axial direction of the inner and outer cylinders. The widths of the second fitting recess and the fourth fitting recess are different from the widths of the first fitting recess and the third fitting recess so as to have the same width, and the axial center direction of the inner and outer cylinders is set. And set one of the inner walls of the first and third fitting recesses and one of the inner walls of the second and fourth fitting recesses in the axial direction of the inner and outer cylinders in the axial direction of the inner and outer cylinders. In the same position.
[0013]
According to this configuration, the first fitting end of the first orifice forming member cannot be fitted into the second fitting recess or the fourth fitting recess having a different width. The third fitting end has the same width as the first fitting recess to be fitted with the first fitting end, but the first fitting end is to be fitted into the third fitting recess. Then, the other second fitting end of the first orifice forming member is displaced from the fourth fitting recess in the axial direction of the inner and outer cylinders, and cannot be fitted into the fourth fitting recess. This is achieved by setting one inner wall of the first and third fitting recesses and one inner wall of the second and fourth fitting recesses in the axial direction of the inner and outer cylinders at the same position in the axial direction of the inner and outer cylinders. Because there is.
[0014]
The second fitting end of the first orifice forming member, and the third fitting end and the fourth fitting end of the second orifice forming member are connected to different fitting recesses from the fitting recess to be fitted. Also, the same state as described above is obtained.
[0015]
Means for making the widths of the first to fourth fitting recesses different from each other (and making the widths of the first to fourth fitting ends different correspondingly) can also exert the same effect as described above. Compared with the means, the configuration according to claim 2 has the following advantages.
[0016]
In this type of liquid-filled type vibration damping device, the width of the orifice forming member may not be able to be increased due to the restriction of each component of the device. In such a case, the fitting recess is set to four different widths. Then, the difference between the widths is reduced. Since these fitting recesses are generally formed of a rubber member, the first fitting end (or the second to fourth fitting ends) is different in width from the first fitting recess to be fitted. If the second fitting recess is pushed into the second fitting recess (or the first, third, and fourth fitting recesses) having only a small difference, the second fitting recess is elastically deformed and fitted.
[0017]
On the other hand, according to the configuration of claim 2, it is only necessary to set the width of the fitting recess to two different widths, and the difference between the two widths can be increased, thereby avoiding the above-described problem. be able to.
[0018]
According to a third aspect of the present invention, in the configuration of the first or second aspect, the first orifice groove includes a first groove portion and a second groove portion along a circumferential direction of the first orifice forming member. The first groove is opened at both ends of the first orifice forming member, and the second groove is opened at one end of the first orifice forming member. Communicate with the liquid chamber,
The second orifice groove is formed as a partial helical groove that allows the open end of the second groove to communicate with the end of the first groove on the other end of the first orifice forming member,
The second orifice forming member is provided with a second opening for communicating an end of the first groove on one end side of the first orifice forming member with the other liquid chamber.
[0019]
With this configuration, the orifice can be formed spirally long. And in the structure provided with such a spiral orifice, the same operation as the above operation by the configuration of claim 1 or 2 can be achieved.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a horizontal cylindrical liquid-filled vibration damping device provided on the rear side of a pair of front and rear vibration damping devices provided between a front suspension member and a lower arm (both not shown) of an automobile. The device is shown.
[0021]
The structure will be described. The vibration-proof base 3 composed of a pair of rubber-like elastic bodies 8 is interposed between the inner cylinder 1 and the intermediate cylinder 16 surrounding the inner cylinder 1, and the intermediate cylinder 16 is fitted inside the outer cylinder 2 to prevent the vibration. A pair of liquid chambers 4 located on both sides of the vibration base 3 and an orifice 5 communicating the two liquid chambers 4 are formed. This liquid filled type vibration damping device is press-fitted into a bracket which is bolted to the vehicle body, and a pin coming out of the lower arm is inserted into the inner cylinder 1 and fixed to the suspension member.
[0022]
The intermediate cylinder 16 includes a pair of concentric ring portions 22 that are brought into pressure contact with the outer cylinder 2, and a pair of connection walls 15 and 17 that connect the two ring portions 22 to each other on a side corresponding to a radially inward side thereof. (See FIGS. 3 and 5).
[0023]
The pair of connecting walls 15 and 17 are located point-symmetrically with respect to the axis O of the intermediate cylinder 16, and the rubber-like elastic body 8 is connected to the pair of connecting walls 15 and 17 and the inner cylindrical portions 1 </ b> A and 1 </ b> B opposed thereto. Vulcanized. The outer peripheral surface of the ring portion 22 and the outer peripheral surfaces of the pair of connecting walls 15 and 17 are covered with a rubber film.
[0024]
As shown in FIGS. 3 and 5 (both not showing the outer cylinder 2), the first fitting recess 33 is provided on one end 15 </ b> A side in the width direction of one connecting wall 15, and the other connecting wall 17 is provided in the width direction. A second fitting concave portion 35 is formed of a rubber member on one end 17A side, and a third fitting concave portion 39 is formed on the other end 15B side of one connecting wall 15 in the width direction. Fourth fitting recesses 41 are formed of rubber members on the end 17B side. The first fitting concave portion 33, the second fitting concave portion 35, the third fitting concave portion 39, and the fourth fitting concave portion 41 are all notched.
[0025]
As shown in FIG. 2, the liquid chamber 4 divides the space between one rubber-like elastic body 8 and the other rubber-like elastic body 8 in the circumferential direction of the inner and outer cylinders 1, 2 with the axes of the inner and outer cylinders 1, 2. It is formed so as to be individually covered with a pair of opposing rubber walls 10 from both outer sides in the core direction. The rubber wall 10 is vulcanized and formed integrally with the rubber-like elastic body 8. The inner peripheral surface of the ring portion 22 and the inner cylindrical portion between the rubber-like elastic bodies 8 in the circumferential direction of the inner and outer cylinders 1 and 2 are vulcanized and bonded.
[0026]
A stopper portion 11 is provided which protrudes into the liquid chamber 4 from the inner cylindrical portion between the pair of rubber walls 10. The stopper 11 prevents excessive relative displacement between the inner cylinder 1 and the outer cylinder 2.
[0027]
As shown in FIGS. 3 to 7, the orifice 5 has a first fitting end 32 on one end 31A side of a first orifice forming member 31 and a second fitting on the other end 31B side. The mating end 34 is fitted into the second fitting recess 35, the third fitting end 38 on the one end 37 A side of the second orifice forming member 37 is fitted into the third fitting recess 39, and the fourth end on the other end 37 B side. The fitting end 40 is formed by fitting into the fourth fitting recess 41. Both the first orifice forming member 31 and the second orifice forming member 37 are arc-shaped.
[0028]
Thus, the first orifice groove 30 formed on the back of the first orifice forming member 31 and the second orifice groove 36 formed on the back of the second orifice forming member 37 are formed on the back side of the connecting wall 21. The communication is made via the road 50.
[0029]
The first orifice groove 30 is composed of a first groove 42 and a second groove 44 along the circumferential direction of the first orifice forming member 31. The first groove 42 is opened at both ends 31A and 31B of the first orifice forming member 31, the second groove 44 is opened at one end 31A of the first orifice forming member 31, and the second groove 44 is opened at the other end 31B. It is communicated with one liquid chamber 4 through one opening 43.
[0030]
The second orifice groove 36 is formed as a partial helical groove that connects the open end 44A of the second groove 44 and the end 42A of the first groove 42 on the other end 31B side of the first orifice forming member 31. It is. A second opening 45 is formed in the second orifice forming member 37 to allow the end 42B of the first groove 42 on one end 31A side of the first orifice forming member 31 to communicate with the other liquid chamber 4.
[0031]
The first fitting end 32, the second fitting end 34, the third fitting end 38, and the fourth fitting end 40 form a first fitting recess 33, a second fitting recess 35, and a third fitting. Of the mating concave portion 39 and the fourth fitting concave portion 41, the first fitting end portion 32 and the second fitting end portion 34 A third fitting end 38 and a fourth fitting end 40, and a first fitting recess 33, a second fitting recess 35, a third fitting recess 39, and a fourth fitting recess 41 are formed. .
[0032]
That is, the first fitting recess 33 and the third fitting recess 39 are set to have the same width as each other and the same position in the axial direction of the inner and outer cylinders 1 and 2, and the second fitting recess 35 and the fourth fitting recess The mating recess 41 is set to have the same width as each other, different from the widths of the first fitting recess 33 and the third fitting recess 39, and the same position in the axial direction of the inner and outer cylinders 1 and 2. The inner walls 33A and 39A of the first and third fitting recesses 33 and 39 and the inner walls 35A and 41A of the second and fourth fitting recesses 35 and 41 in the axial direction of the inner and outer cylinders 1 and 2, respectively. , 2 are set at the same position in the axial direction.
[0033]
As shown in FIG. 5, the first fitting end 32 is formed by projecting one end in the circumferential direction of the first orifice forming member 31 outward in the width direction to form a projection 46. The second fitting end 34 has the same width as the intermediate portion of the first orifice forming member 31 in the circumferential direction. The third fitting end 38 is formed by projecting one end in the circumferential direction of the second orifice forming member 37 outward in the width direction to form a projection 48. The fourth fitting end portion 40 has the same width as the circumferential middle portion of the second orifice forming member 37.
[0034]
A first orifice forming member main body portion excluding the first convex portion 46 in the circumferential direction of the first orifice forming member 31, and a second orifice forming member main body portion excluding the second convex portion 48 in the circumferential direction of the second orifice forming member 37. Is the same width and has a constant width. The first convex portion 46 and the second convex portion 48 project in the same direction in the axial direction of the intermediate cylinder 16, and the first convex portion 46 is formed on the other inner wall 33 </ b> B of the first fitting concave portion 33 by the second convex portion. The portion 48 is in pressure contact with the other inner wall 39B of the third fitting recess 39.
[0035]
The outer cylinder 2 is reduced in diameter in a liquid in a state in which the intermediate cylinder 16 and the like are housed, and both upper and lower ends are bent radially inward. Thereby, the ring portion 22 of the intermediate cylinder 16 is pressed against the outer cylinder 2, and the liquid is sealed in the liquid chamber 4.
[0036]
When vibration is input to the liquid filled type vibration damping device having the above structure, the vibration damping base 3 is elastically deformed, and the inner cylinder 1 and the outer cylinder 2 are relatively displaced. Along with this, the rubber wall 10 is elastically deformed and the volumes of the two liquid chambers 4 change, so that the liquid flows through the orifice 5. As a result, an excellent vibration damping effect can be obtained by a liquid flow effect such as a resonance effect.
[0037]
[Another embodiment]
The widths of the first fitting end 32, the second fitting end 34, the third fitting end 38, and the fourth fitting end 40 are all different from each other. The widths of the mating concave portion 33, the second fitting concave portion 35, the third fitting concave portion 39, and the fourth fitting concave portion 41 may be different.
[0038]
The terms “same width” and “same position” in the claims include “substantially the same width” and “substantially the same position” as long as the effects of the present invention can be achieved.
[0039]
【The invention's effect】
According to the configuration of the first aspect, it is possible to provide a liquid filled type vibration damping device capable of preventing an erroneous assembly of the first orifice forming member and the second orifice forming member to the intermediate cylinder.
[0040]
According to the configuration of claim 2, it is possible to provide a liquid-filled type vibration damping device that can more reliably prevent a mistake in assembling the first orifice forming member and the second orifice forming member to the intermediate cylinder.
[0041]
According to the configuration of the third aspect, it is possible to provide a liquid-filled type vibration damping device having a spiral orifice and capable of obtaining the same effect as the effect of the first or second aspect.
[Brief description of the drawings]
FIG. 1 is a plan view of a liquid filled type vibration damping device. FIG. 2 is a cross-sectional view taken along line AOA of FIG. 1. FIG. 3 is a rear view showing first and second orifice forming members and their mounting portions. FIG. 5 is a plan view showing first and second orifice forming members and their mounting portions. FIG. 5 is a front view showing first and second orifice forming members and their mounting portions. FIG. 6 is a front view showing first and second orifice forming members. FIG. 7 is a left side view showing the mounting portion. FIG. 7 is a right side view showing the first and second orifice forming members and the mounting portion.
DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Vibration-proof base 4 Liquid chamber 5 Orifice 8 Rubber-like elastic body 15 One connection wall 15A One end in the width direction of one connection wall 15B The other end in the width direction of one connection wall 16 Intermediate cylinder 17 The other connecting wall 17A One end 17B of the other connecting wall in the width direction The other end 22 of the other connecting wall in the width direction 22 Ring portion 30 First orifice groove 31 First orifice forming member 31A One end of first orifice forming member 31B First Other end 32 of orifice forming member First fitting end 33 First fitting recess 33A One inner wall 33B of the first fitting recess The other inner wall 34 of the first fitting recess 34 Second fitting end 35 Second fitting Joint recess 35A One inner wall 36 of the second fitting recess 36 Second orifice groove 37 Second orifice forming member 37A One end 37B of the second orifice forming member The other end 38 of the second orifice forming member 38 Third fitting end 39 Mating Recess 39A One inner wall 39B of the third fitting recess The other inner wall 40 of the third fitting recess 40 Fourth fitting end 41 Fourth fitting recess 41A One inner wall 42 of the fourth fitting recess 42 First groove 42A One groove end 42B First groove end 43 at one end of first orifice forming member 43 First opening 44 Second groove 44A Opening end 45 of second groove 45 Second opening

Claims (3)

A pair of liquid chambers interposed between the inner cylinder and the intermediate cylinder surrounding the vibration-proof substrate made of a rubber-like elastic body, the intermediate cylinder is fitted in the outer cylinder, and the vibration-proof substrate is sandwiched therebetween. And an orifice for communicating the two liquid chambers, forming a pair of ring portions for pressing the intermediate cylinder against the outer cylinder, and a pair of vulcanizing and bonding the rubber-like elastic bodies by connecting both ring portions to each other. It consists of a connecting wall and
A first fitting recess is formed at one end in the width direction of one connecting wall, and a second fitting recess is formed at one end in the width direction of the other connecting wall, and the other end in the width direction of the one connecting wall. A third fitting recess is formed on the other side, and a fourth fitting recess is formed on the other end side in the width direction of the other connecting wall, and one end of the first orifice forming member formed in an arc shape to form the orifice. Of the second orifice forming member formed in an arc shape by fitting the first fitting end of the second side into the first fitting recess and the second fitting end of the other end into the second fitting recess. A third fitting end on one end side is fitted in the third fitting recess, and a fourth fitting end on the other end side is fitted in the fourth fitting recess. A liquid-filled type vibration damping device in which an orifice groove communicates with a second orifice groove of the second orifice forming member,
The first fitting end, the second fitting end, the third fitting end, and the fourth fitting end include the first fitting recess, the second fitting recess, the third fitting recess, and the third fitting recess. Of the four fitting recesses, the first fitting end, the second fitting end, and the third fitting end are formed so as not to be fitted in the other three fitting recesses that are not the fitting targets. A liquid filling type vibration damping device having a fourth fitting end, and the first fitting recess, the second fitting recess, the third fitting recess, and the fourth fitting recess. The first fitting recess and the third fitting recess are set to have the same width as each other, and at the same position in the axial direction of the inner and outer cylinders. The widths of the first fitting concave portion and the third fitting concave portion are different from each other and are set to the same width, and set at the same position in the axial direction of the inner and outer cylinders, and the first fitting concave portion and the third fitting concave portion in the axial direction of the inner and outer cylinders are set. 2. A liquid-filled vibration isolator according to claim 1, wherein one inner wall of the third and the third fitting recesses and one inner wall of the second and the fourth fitting recesses are set at the same position in the axial direction of the inner and outer cylinders. apparatus. The first orifice groove is constituted by a first groove and a second groove along a circumferential direction of the first orifice forming member, and the first groove is opened at both ends of the first orifice forming member. The two groove portions are opened at one end of the first orifice forming member, and the other end is communicated with one of the liquid chambers via the first opening, so that the second orifice groove is opened on the open side of the second groove portion. Is formed in a partial helical groove that allows the end of the first orifice forming member to communicate with the end of the first groove on the other end side of the first orifice forming member;
3. The liquid according to claim 1, wherein the second orifice forming member has a second opening for communicating an end of the first groove on one end side of the first orifice forming member with the other liquid chamber. 4. Enclosed vibration damping device.

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