JP4315706B2 - Liquid seal vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine mount used for an engine mount or the like, and more particularly to a highly practical structure of an elastic flexible member.
[0002]
[Prior art]
Liquid seal engine mounts that provide a plurality of liquid chambers and that isolate vibrations by liquid column resonance of orifices that connect these liquid chambers are well known, and furthermore, the liquid chambers are designed to absorb a change in internal pressure and reduce the dynamic springs. A device provided with an elastic flexible member is also known.
[0003]
[Patent Document 1]
Japanese Patent No. 2817570 [Patent Document 2]
JP 2002-70929 A [Patent Document 3]
Japanese Patent Laid-Open No. 2002-310223
FIG. 4 shows an example of this, and an elastic flexible member 6 is sandwiched and fixed between an upper part 4 and a lower part 5 forming a partition member 3 that partitions the liquid chamber into a main liquid chamber 1 and a sub liquid chamber 2. A ring-shaped first stopper 7 is integrally provided on the outer peripheral portion of the lower surface of the elastic flexible member 6, and abuts against a receiving portion 8 that is integrally formed from the lower portion 5. When the elastic flexible member 6 is elastically deformed to the sub liquid chamber 2 side by vibration input from the main liquid chamber 1 side, the first stopper 7 is gradually strongly compressed to the receiving portion 8, and the elastic flexible member 6 is nonlinear. The spring constant is formed.
[0005]
FIG. 5 shows still another example. Similarly, the elastic flexible member 6 sandwiched between the upper part 4 and the lower part 5 of the partition member 3 is integrally formed with a second stopper 10 projecting vertically at the center part. Then, the respective tips are brought into contact with the partition member 3 and the contact support portions 11 and 12 of the upper portion 4. When there is vibration input from the main liquid chamber 1 side, the second stopper 10 is supported by the abutting support portions 11 and 12 on the central side of the elastic flexible member 6 so that it is not easily deformed. A constant can be obtained.
[0006]
[Problems to be solved by the invention]
In the example of FIG. 4, the whole is a low dynamic spring and the first stopper 7 is always in contact with the receiving portion 8 so that no hitting sound is generated. In a region where a large spring constant is required to obtain damping, it is difficult to obtain sufficient damping performance.
On the other hand, in the example of FIG. 5, a sufficiently large attenuation can be exhibited even in a region where the high attenuation is necessary as described above, but due to a large increase in internal pressure when receiving a large engine behavior at the time of engine start and stop, The part 13 is greatly elastically deformed, and inevitably collides with the upper part 4 and the lower part 5 to generate a hitting sound, which may generate a practically difficult level of noise.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an elastic flexible member that can realize both high damping and low dynamic springs and that does not generate hitting sound.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the liquid seal vibration isolator according to claim 1 divides the liquid chamber into two chambers by a partition member, and divides the partition member into an upper part and a lower part, and elastically flexes between the upper and lower parts. In the liquid seal vibration isolator which sandwiches the adhesive member and absorbs the change in the internal pressure of the liquid chamber by this elastic flexible member,
The elastic flexible member is a fixed portion that is sandwiched between an upper end portion of a receiving portion that stands upright at the upper portion and the lower portion of the elastic flexible member. A first stopper that abuts against the receiving part in a continuous ring shape and a pair of second stoppers that protrude from the central part in the vertical direction with an equal length, respectively,
One of the pair of second stoppers protrudes downward longer than the first stopper, and the lower end thereof is abutted and supported at the center of the lower part.
The other is protruded upward, and the upper end of the other is brought into contact with and supported by the central portion of the raised portion that protrudes upward from the position of the fixed portion at the central portion of the upper portion.
The upper and lower portions of the elastic flexible member that overlap with the elastic flexible member in the vertical direction are arranged apart from the fixed portion up and down as much as the protruding length of the second stopper, respectively .
Further, the outer peripheral portion of the elastic flexible member (6) is deformed in the diameter reducing direction, and is an intermediate portion that is a portion between the fixed portion (26) and the central portion where the second stopper (10) is provided. The part (13) is bent to form a bent part (27) .
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the second stopper positioning portions are provided on the contact support portions of the second stopper provided on the upper and lower portions of the partition member, respectively.
[0010]
According to a third aspect of the present invention, in the first aspect, the thickness of the lower surface between the first stopper and the second stopper of the elastic flexible member is thin at the intermediate portion between the first stopper and the second stopper. 2. The liquid seal vibration isolator according to claim 1, wherein the liquid seal vibration isolator is curved so as to become.
[0011]
【The invention's effect】
According to the first aspect, in a region where a low dynamic spring is required, the elastic flexible member is elastically deformed while generating a non-linear spring constant by the first stopper to absorb the change in internal pressure, thereby reducing the dynamic spring. In a region requiring high damping at the time of large input via a suspension due to road surface unevenness, the second stopper can prevent the elastic flexible member from being excessively elastically deformed to obtain sufficient damping performance. In addition, the second stopper protrudes in the vertical direction of the elastic flexible member, and the contact support portions of the second stopper at the upper and lower portions of the partition member are located away from the outer peripheral surface of the elastic flexible member. Therefore, even if the middle part of the elastic flexible member is elastically deformed due to a large increase in internal pressure when it receives a large engine behavior at the start or stop of the engine, it does not collide with the partition member side and makes a hitting sound. Does not occur.
Therefore, it satisfies all the necessary conditions required for the elastic flexible member, such as a low dynamic spring, high damping and no hitting sound, and has sufficient practicality.
In addition, since the elastic flexible member is bent in advance by the tightening allowance, the initial spring constant can be lowered to obtain a low dynamic spring characteristic with more remarkable non-linearity.
[0012]
According to the second aspect, since the positioning portion of the second stopper is provided in the contact support portion of the partition member, the second stopper is not displaced even when elastically deformed, and stable performance can be exhibited.
[0014]
According to claim 3 , the lower surface between the first stopper and the second stopper of the elastic flexible member is curved so that the thickness at the intermediate portion between the first stopper and the second stopper becomes thin. Therefore, the elastic rigidity of the elastic flexible member can be reduced by reducing the film rigidity of the elastic flexible member, effectively absorbing the hydraulic pressure at the time of small input, and making the elastic deformation of the elastic flexible member smoother. The first stopper can be effectively elastically deformed to exhibit attenuation during large input.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments will be described below with reference to the drawings. 1 is a top view of the engine mount, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of an elastic flexible member portion. The same parts as those in the conventional example are denoted by the same reference numerals. Further, in the present application, the vertical and horizontal directions are based on the arrangement shown in FIG.
[0016]
In FIG. 1, the engine mount 20 connects a first mounting bracket 21 for mounting to an engine (not shown) as a vibration source and a second mounting bracket 22 for mounting to a vehicle body (not shown) on the vibration receiving side. An insulator 23 made of vibration-proof rubber or the like is provided.
[0017]
As shown in FIG. 2, a liquid chamber is formed inside the insulator 23, and the inside is further divided into a main liquid chamber 1 and a sub liquid chamber 2 by a partition member 3. The partition member 3 is divided into an upper part 4 and a lower part 5, and a damping orifice 24 that connects the main liquid chamber 1 and the sub liquid chamber 2 is formed therebetween.
[0018]
The elastic flexible member 6 is supported by being sandwiched between the upper portion 4 and the lower portion 5 at the central portion of the partition member 3. The damping orifice 24 is set so as to resonate with the liquid column at the time of a large input via a suspension caused by road surface unevenness. Reference numeral 25 denotes a diaphragm.
[0019]
FIG. 3 shows an enlarged central portion of the partition member 3, and the elastic flexible member 6 is made of a material rich in elasticity such as rubber and has a receiving portion 8 erected from the upper portion 4 and the lower portion 5. The sandwiched portion is referred to as a fixed portion 26. A second stopper 10 is integrally formed so as to protrude vertically at the center of the elastic flexible member 6.
[0020]
The second stopper 10 protrudes from the surface of the central portion of the elastic flexible member 6 with a substantially equal length L in the vertical direction. The outer peripheral part forms a fixed part 26 sandwiched between the upper part 4 and the upper end of the receiving part 8 .
[0021]
The upper surface side of the intermediate portion 13 that is a portion between the fixing portion 26 of the elastic flexible member 6 and the central portion where the second stopper 10 is provided is in a direction in which the diameter of the elastic flexible member 6 is reduced in advance. By being elastically deformed, the bent portion 27 is recessed from an imaginary line that is an extension of the surface of the outer peripheral portion of the fixed portion 26 . The lower surface of the outer peripheral portion of the elastic flexible member 6 is formed so as to form a substantially ring-shaped first stopper 7 is continued communication to the extended Amane Shikatsu direction downwards. The first stopper 7 has an arm shape whose cross section is slanted, and its tip abuts against the receiving portion 8. The lower surface of the intermediate portion 13 between the first stopper 7 and the second stopper 10 forms a curved portion 28 so that the thickness at the intermediate portion is reduced .
[0022]
The central portion of the upper portion 4 overlaps with the elastic flexible member 6 in the upper and lower portions of the figure, and forms a raised portion 14 having a dimension of about L and protruding from the general surface 4a into the upper main liquid chamber 1. An inner surface side of the abutting support portion 11 formed at the center portion forms a concave curved positioning portion 15, and a curved surface portion which is an upper end of the upper second stopper 10 is fitted therein. Around the positioning portion 15, a hole portion 16 communicating with the main liquid chamber 1 is formed.
[0023]
The central portion of the lower surface of the lower portion 5 extends substantially flush with the general surface 5a and overlaps the elastic flexible member 6 in the vertical direction in the figure, and the contact support portion 12 provided at the central portion also has a positioning portion similar to the upper portion. 17 is formed, and the tip of the lower second stopper 10 is fitted in the recess. A hole 18 that communicates with the auxiliary liquid chamber 2 is formed in a portion overlapping the elastic flexible member 6 around the positioning portion 17.
[0024]
Next, the operation will be described. When vibration in a region requiring a low dynamic spring is input to the main liquid chamber 1, the intermediate portion 13 of the elastic flexible member 6 is elastically deformed to absorb the change in internal pressure. At this time, since the initial spring constant is lowered by the bending portion 27 by the tightening margin with respect to the elastic flexible member 6 and the non-linear remarkable elastic deformation is performed by the first stopper 7, the internal pressure change is absorbed. A low dynamic spring can be realized.
[0025]
In areas where high damping is required, such as during large inputs with suspension due to road surface irregularities, the second stopper 10 prevents the elastic deformation of the central portion of the elastic flexible member 6 and increases the spring constant to increase the middle. The elastic deformation of the part 13 is also reduced. Thereby, the liquid flow rate of the damping orifice 24 can be increased to obtain a sufficient damping performance.
[0026]
Moreover, the second stopper 10 protrudes in the vertical direction longer than the outer peripheral surface of the elastic flexible member 6 as a dimension L, and the second stopper contact support portion 11 at the upper portion 4 and the lower portion 5 of the partition member 3. Since 12 is located at a position far away from the outer peripheral surface of the elastic flexible member 6, the elastic flexible member 6 is caused by a large increase in internal pressure when receiving a large engine behavior at the time of starting or stopping the engine. Even if the intermediate portion 13 is elastically deformed, it does not collide with the partition member 3 and no hitting sound is generated.
[0027]
Therefore, it satisfies all the necessary requirements for the elastic flexible member 6 that it does not generate a low dynamic spring, high damping and hammering sound, and has sufficient practicality.
[0028]
In addition, since the second stopper positioning portions 15 and 17 are provided in the contact support portions 11 and 12 of the partition member 3, respectively, even if the elastic flexible member 6 is elastically deformed, the position of the second stopper 10 is increased. There is no deviation and stable performance can be demonstrated.
[0029]
In addition, since the elastic flexible member 6 is preliminarily bent by the tightening allowance and the bending portion 27 is provided, the initial spring constant can be lowered to obtain a low dynamic spring characteristic with more remarkable non-linearity.
[0030]
In addition, since the portion of the elastic flexible member 6 that faces the first stopper 7 is curved to form the curved portion 28, the membrane rigidity of the elastic flexible member 6 is reduced and the hydraulic pressure at the time of small input is effective. The first stopper 7 can be effectively elastically deformed by making the elastic deformation of the elastic flexible member 6 smoother and exhibit attenuation at the time of large input. Can do.
[0031]
Note that the present invention is not limited to the above-described embodiments, and various modifications and applications can be made within the principle of the invention. For example, the application object of the present invention is not limited to the engine mount, and various liquid seal vibration isolators are possible.
[Brief description of the drawings]
1 is a top view of an engine mount. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1. FIG. 3 is an enlarged cross-sectional view of an elastic flexible member. FIG. 5 is an enlarged sectional view showing an elastic flexible member portion in another conventional example.
1: main liquid chamber, 2: sub liquid chamber, 3: partition member, 4: upper part, 5: lower part, 6: elastic flexible member, 7: first stopper, 8: contact support part, 10: first part 2 stoppers, 11: contact support part, 12: contact support part, 15: positioning part, 17: positioning part, 27: deflection part, 28: bending part

Claims (3)

The liquid chamber is divided into two chambers by a partition member, and the partition member is divided into an upper part and a lower part, and an elastic flexible member is sandwiched between the upper and lower parts, and the internal pressure change of the liquid chamber is changed by the elastic flexible member. In the liquid seal vibration isolator designed to absorb,
The elastic flexible member (6) has an outer peripheral portion as a fixing portion (26) sandwiched between an upper end portion of a receiving portion (8) provided upright on the upper portion (4) and the lower portion (5). The first stopper (7) projecting downward on the lower surface in the vicinity of the inside of the fixed portion and forming a ring shape continuous in the circumferential direction and contacting the receiving portion (8) is equivalent to the center portion in the vertical direction. A pair of second stoppers (10) protruding in length are provided integrally,
One of the pair of second stoppers (10) is protruded downward longer than the first stopper (7) and the lower end thereof is contacted and supported at the center of the lower part (5), and
The other is protruded upward, and its upper end is contacted and supported by the central part of the raised part (14) raised upward from the position of the fixed part (26) at the central part of the upper part (4),
The portions of the upper portion (4) and the lower portion (5) that overlap the elastic flexible member (6) in the vertical direction are approximately the same as the protruding length of the second stopper (10) from the fixing portion (26). Placed up and down ,
Further, the outer peripheral portion of the elastic flexible member (6) is deformed in the diameter reducing direction, and is an intermediate portion that is a portion between the fixed portion (26) and the central portion where the second stopper (10) is provided. A liquid seal vibration isolator characterized by bending the portion (13) into a flexible portion (27) .   The second stopper positioning portions (15), (12) are provided on the contact stoppers (11), (12) of the second stopper (10) provided on the upper part (4) and the lower part (5) of the partition member, respectively. The liquid seal vibration isolator according to claim 1, further comprising (17). Intermediate of said first stopper (7) and the second of said first stopper under surface between the stopper (10) and (7) a second stopper of the elastic flexible member (6) (10) The liquid seal vibration isolator according to claim 1, wherein the liquid seal vibration isolator is curved so as to be thin in the portion (13) .

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