JP4158897B2 - Liquid-filled vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a vibration-proof 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 fitted into the outer cylinder, and the vibration-proof base is sandwiched between them. A pair of liquid chambers and an orifice for communicating the two liquid chambers are formed, a pair of ring portions that press-contact the intermediate cylinder to the outer cylinder, and the ring portions are connected to each other to vulcanize the rubber-like elastic body. A pair of connecting walls to be bonded,
A first fitting recess is formed on one end side in the width direction of one connecting wall, a second fitting recess is formed on one end side in the width direction of the other connecting wall, and the other end in the width direction of the one connecting wall. Forming a third fitting recess on the side, and forming a fourth fitting recess on the other end side in the width direction of the other connecting wall;
To form the orifice, a first fitting end portion on one end side of a first orifice forming member formed in an arc shape is used as the first fitting recess portion, and a second fitting end portion on the other end side is used as the second fitting end portion. A third fitting end on one end side of the second orifice forming member that is fitted in the fitting recess and formed in an arc shape is formed in the third fitting recess, and a fourth fitting end on the other end side is formed in the first. The present invention relates to a liquid-filled vibration isolator that is fitted in a four-fitting recess and communicates a first orifice groove of the first orifice forming member and a second orifice groove of the second orifice forming member.
[0002]
[Prior art]
When manufacturing this type of liquid-filled vibration isolator, 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 cylinders are attached. The outer cylinder is inserted into the outer cylinder in the liquid, and the outer cylinder is reduced in diameter.
[0003]
The liquid-filled vibration isolator thus obtained is provided, for example, between a suspension member of an automobile and a differential mechanism, etc., and elastically deforms a rubber-like elastic body by the input of vibration, and the volume of both liquid chambers The liquid is made 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 arc-shaped and formed in substantially the same size. The first to fourth fitting end portions can be fitted to any of the first to fourth fitting recesses.
[0005]
[Problems to be solved by the invention]
According to the above-described conventional configuration, the first orifice forming member and the second orifice forming member are mistaken, and their fitting end portions are fitted into the fitting recesses of the intermediate cylinder, or the first orifice forming member (or the first orifice forming member (or the first orifice forming member)). 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, 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]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a liquid-filled vibration isolator capable of preventing an assembly error between the first orifice forming member and the second orifice forming member to the intermediate cylinder. It is in.
[0008]
[Means for Solving the Problems]
The configuration of the invention according to claim 1 is the liquid-filled vibration isolator described at the beginning.
The first fitting end, the second fitting end, the third fitting end, and the fourth fitting end are the first fitting recess, the second fitting recess, the third fitting recess, The first fitting end, the second fitting end, and the third fitting end so that they cannot be fitted into the other three fitting recesses that are not to be fitted among the four fitting recesses. Forming 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 and at the same position in the axial direction of the inner and outer cylinders, and the second fitting recess and the fourth fitting recess are The first fitting recess and the third fitting recess are different from each other in width and set to have the same width and at the same position in the axial direction of the inner and outer cylinders, and the first and second cylinders in the axial direction of the inner and outer cylinders. And one inner wall of the third fitting recess and one inner wall of the second and fourth fitting recess are set at the same position in the axial direction of the inner and outer cylinders,
The first fitting end portion is configured by projecting one end portion in the circumferential direction of the first orifice forming member outward in the width direction to form a convex portion,
The third fitting end portion is configured by projecting one end portion in the circumferential direction of the second orifice forming member outward in the width direction to form a convex portion ,
The first orifice groove includes a first groove portion and a second groove portion along a circumferential direction of the first orifice forming member,
Of the first groove portion and the second groove portion, the first groove portion on the convex side in the width direction is opened at both ends in the circumferential direction of the first orifice forming member .
[0009]
With this configuration, the first fitting end portion and the second fitting end portion of the first orifice forming member are reversed and fitted into the first fitting recess and the second fitting recess, or the third fitting recess. And fitting into the third fitting recess and the fourth fitting recess by reversing the first fitting end and the second fitting end. .
[0010]
Further, the third fitting end portion and the fourth fitting end portion of the second orifice forming member are reversed to be fitted into the third fitting concave portion and the fourth fitting concave portion, or the first fitting concave portion and the first fitting concave portion are It becomes impossible to fit into the first fitting concave portion and the second fitting concave portion by fitting into the two fitting concave portions and by reversing the third fitting end portion and the fourth fitting end portion.
[0011]
That is, unless the first fitting end and the second fitting end are fitted to the first fitting recess and the second fitting recess, respectively, which are the fitting objects, the first orifice forming member is in the middle. Can not be attached to the tube. Similarly, unless the third fitting end and the fourth fitting end are fitted to the third fitting recess and the fourth fitting recess, respectively, which are the fitting targets, the second orifice forming member is It cannot be attached to the intermediate cylinder.
[0013]
Further, according to the first aspect, the first mating end of the first orifice-forming member, can not be fitted to the different second fitting recess and the fourth fitting recess widths and this . The third fitting end has the same width as the first fitting recess that is the fitting target of the first fitting end, but the first fitting end is intended 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 because 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 are set 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 different from the fitting recess to be fitted. The same state as described above is obtained even when fitted to.
[0015]
Although the first to fourth fitting recesses have different widths (and correspondingly change the widths of the first to fourth fitting end portions), the same effect as described above can be obtained. Compared with the means, the configuration according to claim 1 has the following advantages.
[0016]
In this type of liquid-filled vibration isolator, the width of the orifice forming member may not be increased due to restrictions on each part of the device. In such a case, the fitting recess is set to four different widths. Then, the difference between the widths becomes small. Since these fitting recesses are generally formed of a rubber member, the first fitting end portion (or the second to fourth fitting end portions) is wider than the first fitting recess portion to be fitted. If it is pushed into the second fitting recess (or the first, third, and fourth fitting recesses) that has only a small difference, there is a problem that the second fitting recess is elastically deformed and fitted.
[0017]
On the other hand, according to the configuration of claim 1 , 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 problems. be able to.
[0018]
The configuration of the invention according to claim 2 is the configuration of the invention according to claim 1, said second groove, causes open at one end of said first orifice forming member, one through the first opening in the other end Communicate with the liquid chamber,
Forming the second orifice groove into a partial spiral groove that communicates the open end of the second groove with the end of the first groove on the other end of the first orifice forming member;
The second orifice forming member is formed with a second opening that communicates the end of the first groove on one end of the first orifice forming member with the other liquid chamber.
[0019]
With this configuration, the orifice can be formed in a long spiral shape. And in the structure provided with such a helical orifice, there can exist an effect | action similar to the said effect | action by the structure of Claim 1 .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a horizontal type cylindrical liquid-filled type vibration isolation device provided on the rear side of a pair of front and rear vibration isolation devices provided between a front suspension member and a lower arm (both not shown) of the automobile. The device is shown.
[0021]
The structure will be described. An antivibration 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 into the outer cylinder 2 to prevent A pair of liquid chambers 4 positioned with the vibration base 3 interposed therebetween, and an orifice 5 for communicating the two liquid chambers 4 are formed. This liquid-filled vibration isolator is press-fitted into a bracket that is bolted to the vehicle body, and a pin protruding from 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 pressed against the outer cylinder 2, and a pair of connecting walls 15 and 17 that connect the ring portions 22 to each other on the side corresponding to the radially inner side thereof. (See FIGS. 3 and 5).
[0023]
The pair of connecting walls 15 and 17 are positioned point-symmetrically with respect to the axis O of the intermediate cylinder 16, and the rubber-like elastic body 8 includes a pair of connecting walls 15 and 17 and inner cylinder portions 1A and 1B facing these. It has been vulcanized. Further, 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 (the outer cylinder 2 is not shown), the first fitting recess 33 is provided on the one end 15 </ b> A side in the width direction of one connecting wall 15, and the width direction of the other connecting wall 17 is shown. The second fitting recess 35 is formed of a rubber member on the one end 17A side, the third fitting recess 39 on the other end 15B side in the width direction of one of the connecting walls 15, and the other in the width direction of the other connecting wall 17. The fourth fitting recesses 41 are each formed of a rubber member on the end 17B side. The first fitting recess 33, the second fitting recess 35, the third fitting recess 39, and the fourth fitting recess 41 are all notched.
[0025]
As shown in FIG. 2, the liquid chamber 4 has a 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. Each is covered with a pair of rubber walls 10 facing each other from both outer sides in the core direction. The rubber wall 10 is integrally vulcanized with the rubber-like elastic body 8. The inner circumferential surface of the ring portion 22 and the inner cylinder portion between the rubber-like elastic bodies 8 are vulcanized and bonded to each other in the circumferential direction of the inner and outer cylinders 1 and 2.
[0026]
A stopper portion 11 that protrudes into the liquid chamber 4 from the inner cylinder portion between the pair of rubber walls 10 is provided. This stopper portion 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 the first fitting end 32 on the one end 31 </ b> A side of the first orifice forming member 31 in the first fitting recess 33 and the second fitting on the other end 31 </ b> B side. The end 34 is fitted into the second fitting recess 35, the third fitting end 38 on the one end 37A side of the second orifice forming member 37 is set to the third fitting recess 39, and the fourth on the other end 37B 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 have an arc shape.
[0028]
Accordingly, the first orifice groove 30 formed on the back portion of the first orifice forming member 31 and the second orifice groove 36 formed on the back portion of the second orifice forming member 37 are formed on the back side of the connecting wall 21. Communicate through the path 50.
[0029]
The first orifice groove 30 includes a first groove portion 42 and a second groove portion 44 that extend along the circumferential direction of the first orifice forming member 31. Further, the first groove portion 42 is opened at both ends 31A and 31B of the first orifice forming member 31, and the second groove portion 44 is opened at one end side 31A of the first orifice forming member 31 and at the other end 31B side. One liquid chamber 4 is communicated with each other through one opening 43.
[0030]
The second orifice groove 36 is formed as a partial spiral groove that communicates the open end portion 44A of the second groove portion 44 with the end portion 42A of the first groove portion 42 on the other end 31B side of the first orifice forming member 31. It is. The second orifice forming member 37 is formed with a second opening 45 that allows the end 42B of the first groove 42 on the 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 are connected to the first fitting recess 33, the second fitting recess 35, and the third fitting. The first fitting end portion 32 and the second fitting end portion 34 are arranged so that the fitting recess 39 and the fourth fitting recess 41 cannot be fitted into the other three fitting recesses that are not to be fitted, respectively. A third fitting end 38, a fourth fitting end 40, 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 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 are set. The joint recess 41 is set to have the same width as the first fitting recess 33 and the third fitting recess 39, and at the same position in the axial direction of the inner and outer cylinders 1, 2. One inner wall 33A, 39A of the first and third fitting recesses 33, 39 and one inner wall 35A, 41A of the second and fourth fitting recesses 35, 41 in the axial direction of 1, 2 , 2 are set at the same position in the axial direction.
[0033]
As shown in FIG. 5, the first fitting end portion 32 is configured such that one end portion in the circumferential direction of the first orifice forming member 31 protrudes outward in the width direction to form a convex portion 46. The second fitting end portion 34 has the same width as the intermediate portion in the circumferential direction of the first orifice forming member 31. The third fitting end portion 38 is configured by projecting one end portion in the circumferential direction of the second orifice forming member 37 outward in the width direction to form a convex portion 48. The fourth fitting end portion 40 has the same width as the intermediate portion in the circumferential direction of the second orifice forming member 37.
[0034]
The first orifice forming member main body excluding the first convex portion 46 in the circumferential direction of the first orifice forming member 31 and the second orifice forming member main body excluding the second convex portion 48 in the circumferential direction of the second orifice forming member 37. Are the same width and constant width. The first convex portion 46 and the second convex portion 48 protrude 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. 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 subjected to diameter reduction processing in the liquid in a state where the intermediate cylinder 16 and the like are accommodated, and the upper and lower ends are bent radially inward. As a result, 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 vibration isolator having the above structure, the vibration isolating 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 to change the volume of both liquid chambers 4, and 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 action.
[0037]
[Another embodiment]
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 all made different in width, and the first fitting end is made corresponding to this. The widths of the combined recess 33, the second fitting recess 35, the third fitting recess 39, and the fourth fitting recess 41 may be different.
[0038]
The “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 obtained.
[0039]
【The invention's effect】
According to the configuration of the first aspect, it is possible to provide a liquid filled type vibration isolator capable of preventing an assembly error between the first orifice forming member and the second orifice forming member to the intermediate cylinder.
[0041]
According to the configuration of the second aspect , it is possible to provide a liquid-filled type vibration damping device that includes a spiral orifice and can obtain the same effect as the configuration of the first aspect .
[Brief description of the drawings]
FIG. 1 is a plan view of a liquid-filled vibration isolator. FIG. 2 is a cross-sectional view taken along the line A-O-A in FIG. 1. FIG. 3 is a rear view showing first and second orifice forming members and their attachment parts. FIG. 5 is a plan view showing the first and second orifice forming members and their attaching portions. FIG. 5 is a front view showing the first and second orifice forming members and their attaching portions. 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 Anti-vibration base | substrate 4 Liquid chamber 5 Orifice 8 Rubber-like elastic body 15 One connection wall 15A The one end 15B of the one connection wall in the width direction The other end 16 of the one connection wall in the width direction 16 The intermediate cylinder 17 The other connecting wall 17A One end 17B in the width direction of the other connecting wall The other end 22 in the width direction of the other connecting wall Ring part 30 First orifice groove 31 First orifice forming member 31A One end 31B of the first orifice forming member First The other end 32 of the 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 Second fitting end 35 Second fitting Joint recess 35A One inner wall 36 of second fitting recess 37 Second orifice groove 37 Second orifice forming member 37A One end 37B of second orifice forming member 38 Other end 38 of second orifice forming member Third fitting end 39 Third Mating Concave portion 39A One inner wall 39B of the third fitting concave portion The other inner wall 40 of the third fitting concave portion Fourth fitting end portion 41 Fourth fitting concave portion 41A One inner wall 42 of the fourth fitting concave portion First groove portion 42A End portion 42B of one groove portion End portion 43 of the first groove portion on one end side of the first orifice forming member 43 First opening 44 Second groove portion 44A End portion 45 on the open side of the second groove portion Second opening

Claims (2)

A pair of liquid chambers located between the inner cylinder and an intermediate cylinder surrounding the intermediate cylinder, with a vibration-proof base made of a rubber-like elastic body interposed between the inner cylinder and the outer cylinder. And a pair of ring portions that press the intermediate cylinder in pressure contact with the outer cylinder, and a pair of vulcanized and bonded rubber-like elastic bodies by connecting the ring sections together. Composed of connecting walls,
A first fitting recess is formed on one end side in the width direction of one connecting wall, a second fitting recess is formed on one end side in the width direction of the other connecting wall, and the other end in the width direction of the one connecting wall. Forming a third fitting recess on the side, and forming a fourth fitting recess on the other end side in the width direction of the other connecting wall;
To form the orifice, a first fitting end portion on one end side of a first orifice forming member formed in an arc shape is used as the first fitting recess portion, and a second fitting end portion on the other end side is used as the second fitting end portion. A third fitting end on one end side of the second orifice forming member that is fitted in the fitting recess and formed in an arc shape is formed in the third fitting recess, and a fourth fitting end on the other end side is formed in the first. 4 is a liquid-filled vibration isolator that is fitted in a fitting recess and communicates the first orifice groove of the first orifice forming member and the 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 are the first fitting recess, the second fitting recess, the third fitting recess, The first fitting end, the second fitting end, and the third fitting end so that they cannot be fitted into the other three fitting recesses that are not to be fitted among the four fitting recesses. Forming 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 and at the same position in the axial direction of the inner and outer cylinders, and the second fitting recess and the fourth fitting recess are The first fitting recess and the third fitting recess are different from each other in width and set to have the same width and at the same position in the axial direction of the inner and outer cylinders, and the first and second cylinders in the axial direction of the inner and outer cylinders. And one inner wall of the third fitting recess and one inner wall of the second and fourth fitting recess are set at the same position in the axial direction of the inner and outer cylinders,
The first fitting end portion is configured by projecting one end portion in the circumferential direction of the first orifice forming member outward in the width direction to form a convex portion,
The third fitting end portion is configured by projecting one end portion in the circumferential direction of the second orifice forming member outward in the width direction to form a convex portion ,
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 liquid-filled vibration isolator in which the first groove portion on the convex side in the width direction of the first groove portion and the second groove portion is opened on both ends in the circumferential direction of the first orifice forming member . Said second groove, causes open at one end of said first orifice forming member, in communication with the one liquid chamber via the first opening at the other end,
Forming the second orifice groove into a partial spiral groove that communicates the open end of the second groove with the end of the first groove on the other end of the first orifice forming member;
2. The liquid-filled type according to claim 1, wherein the second orifice forming member is formed with a second opening communicating the end of the first groove on one end side of the first orifice forming member with the other liquid chamber. Anti-vibration device.

Images