JP4545343B2 - Liquid seal vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid seal vibration isolator used for an engine mount or the like, and relates to a cylindrical bush unit and a combination of a cylindrical bush and a conical mount.
[0002]
[Prior art]
A first attachment member attached to the vibration generating side, a second attachment member attached to the vibration receiving side, and a substantially conical elastic body member connecting the first attachment member and the second attachment member A liquid chamber having the elastic main body member as a part of the elastic wall portion is provided inside the elastic main body member, and the liquid chamber is partitioned into a main liquid chamber and a sub liquid chamber by a partition member, and both liquid chambers are provided. Conical mounts are known which are connected by a first orifice passage.
[0003]
A cylindrical bush is also known in which cylindrical inner and outer cylinders are connected by an elastic member, a plurality of liquid chambers partitioned by an elastic member in the circumferential direction are provided, and the liquid chambers are connected by an orifice passage.
[0004]
Further, the applicant of the present application has applied for a liquid seal vibration isolator in which a cylindrical bush and a conical mount are integrated (Japanese Patent Application No. 2000-284387). 10 and 11 show this, FIG. 10 is a plan view, and FIG. 11 is a sectional view taken along line 11-11. In the following description, the left-right direction in the illustrated state of FIG. 10 (front-rear direction when mounted on the vehicle body), the up-down direction (left-right direction when mounted on the vehicle body), and the up-down direction in FIG. The X-axis direction, Y-axis direction, and Z-axis direction are assumed. The structure of this liquid seal vibration isolator will be outlined below.
[0005]
As shown in FIG. 11, this engine mount is formed by integrally forming a conical mount portion 1 and a cylindrical bush portion 2, and the conical mount portion 1 is a first attachment member 3 attached to the engine side. A second mounting member 5 configured as a rigid cylindrical outer frame surrounding the periphery of the first mounting member 3 and the second mounting member 5 with a space therebetween, and a substantially conical shape that connects between the first mounting member 3 and the second mounting member 5. The elastic main body member 7 is provided. One end of a stopper 4 having a substantially L-shaped cross section is attached to the first attachment member 3. A vehicle body side bracket 6 attached to the vehicle body side is welded to the second attachment member 5.
[0006]
A substantially conical space opened downward in the figure in the elastic main body member 7 is formed, a partition member 8 and a diaphragm 9 are attached to the lower opening side, and a main liquid chamber 10 partitioned inside by the partition member 8 and The auxiliary liquid chamber 11 is used as a damping orifice that constantly communicates between the two liquid chambers via a first orifice passage 15 formed in the partition member 8 and absorbs vibrations in a large-amplitude low-frequency region during general traveling of the vehicle. .
[0007]
The cylindrical bush portion 2 has a pair of side liquid chambers 20 whose outer walls are part of the elastic wall on the outer periphery of the elastic main body member 7 at intervals of 180 ° in the circumferential direction. The chamber cover 22 is hermetically sealed, and the liquid chamber cover 22 is formed with a second orifice passage 24 extending in the circumferential direction between the second mounting member 5 and always communicating between the opposing side liquid chambers 20. The damping orifice is the same as that of the first orifice passage 15.
[0008]
Between the opposing side liquid chambers 20, there is provided a straight part 25 which is a concave part opened upward in FIG. 11 and is surrounded by a thin part 26, an elastic partition wall 27 and a side wall 28. The thin portion 26 forms a bottom portion of the straight portion 25 and a part of the elastic main body member 7 is made into a special thin portion, and generates membrane resonance by vibration input in the middle frequency region. The elastic partition walls 27 partition the side liquid chambers 20 and are formed in the radial directions as shown in FIG. 10 and have the same membrane resonance characteristics as the thin portion 26.
[0009]
[Problems to be solved by the invention]
By the way, the cylindrical bush part 2 acts as a rubber spring by the elastic member which comprises, In this example, it has a spring value intrinsic | native in the front-back direction and the left-right direction, respectively.
However, when the straight portion 25 is provided, the spring value in the direction in which the straight portion 25 is provided, that is, in this example, the spring value in the left-right direction is decreased. Therefore, in order to improve riding comfort, the spring value in the left-right direction is increased. It is necessary. For this purpose, it is conceivable to increase the rigidity by increasing the thickness of the elastic partition wall 27. However, the elastic partition wall 27 is elastically deformed with respect to the vibration input in the front-rear direction, thereby making the volume of the side liquid chamber 20 variable. Therefore, it is not possible to increase the rigidity without limitation, and it is required to form a film structure that increases the rigidity only against vibration in the left-right direction. Therefore, the present invention aims to realize such a demand.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the first invention related to the liquid seal vibration isolator of the present application is the first attachment member attached to either the vibration generating side or the vibration receiving side, and attached to either one side. A second mounting member that surrounds the first mounting member in a substantially cylindrical shape; and a substantially conical elastic body member that couples the first and second mounting members. A conical mount portion in which a liquid chamber is provided as a part of an elastic wall, the interior is divided into a main liquid chamber and a sub liquid chamber by a partition member, and the main liquid chamber and the sub liquid chamber are communicated by a first orifice passage. And providing
A plurality of side liquid chambers that share the elastic main body member as a part of the elastic wall are provided at predetermined intervals in the circumferential direction on the outer peripheral portion of the elastic main body member, and a space between the side liquid chambers is a second orifice passage. Provided with a cylindrical bush portion in communication , and this cylindrical bush portion and the conical mount portion are integrated,
A direction in which the first and second mounting members are coupled by compressing the first or second mounting member by pressing the elastic partition wall toward the first or second mounting member; and The spring ratio in a direction substantially orthogonal to this is adjusted.
[0012]
According to a second aspect of the present invention, in the first aspect of the present invention, a protrusion that fits the pressure contact end portion of the elastic partition wall is provided on the seat portion to which the elastic partition wall is press-contacted, and the protrusion and the elastic partition wall are provided between A predetermined gap is provided.
[0013]
【The invention's effect】
According to the first invention, the liquid seal vibration isolator is compressed between the first or second mounting members because the elastic partition wall of the cylindrical bush portion is pressed against the first or second mounting member. And the spring value in the direction (henceforth a Y-axis direction) which connects the said 1st and 2nd attachment member is raised. As a result, when the spring in the Y-axis direction, which tends to have a low spring value, is strengthened and the direction orthogonal to this is defined as the X-axis direction, the spring ratio in the two orthogonal axes can be easily controlled.
[0014]
In addition, since the cylindrical bush portion is integrated with the conical mount portion, if the main vibration input direction of the conical mount portion is the Z axis orthogonal to the XY axis, the spring ratio in the three orthogonal directions is easy. Can be controlled.
[0015]
According to the second invention, since the gap is provided between the pressing portion of the elastic partition wall and the protrusion provided on the seat portion, when the elastic partition wall is elastically deformed, the amount of elastic deformation is reduced with respect to small vibrations. Set the spring value so that it can be increased, and if the elastic partition wall comes into contact with the protrusion during large vibration, the spring value can be changed nonlinearly by restricting further elastic deformation and increasing the spring value. Become.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment configured as an engine mount of a vehicle will be described with reference to the drawings. Figure 1 is a plan view showing the engine mount from the vehicle body mounting during the above side of the Z-axis direction, FIG. 2 is the total 90 ° difference sectional view (sectional view taken along line 2-2 in FIG. 1), 3 2 FIG. 4 is a perspective view of an insertion body in which the first mounting portion and the elastic member are integrated, FIG. 5 is a plan view of the insertion body, and FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6 , FIG. 8 is an enlarged view of a portion A in FIG. 7, and FIG. 9 is a view showing a modification of the same portion as FIG. In addition, a common code | symbol is used for the part which is common in FIG.10 and FIG.11.
[0017]
In these drawings, the engine mount is formed by integrally forming a conical mount portion 1 and a cylindrical bush portion 2, and the conical mount portion 1 includes a first mounting member 3 attached to the engine side, A second mounting member 5 configured as a rigid cylindrical outer frame that surrounds the periphery with a space therebetween, and a substantially conical elasticity that connects between the first mounting member 3 and the second mounting member 5. A main body member 7 is provided.
[0018]
The first mounting member 3 has an axial direction that coincides with the Z-axis direction, which is the main vibration input direction in the conical mount portion 1, and a portion embedded in the elastic body member 7 has a cylindrical shape, The lower part is made thinner than the step part provided in the upper part, and it extends long along the Z-axis direction. A portion of the first mounting member 3 protruding from the elastic main body member 7 forms a flat portion and is connected to a stopper (not shown) (see FIGS. 10 and 11).
[0019]
The substantially conical space formed by the elastic main body member 7 forms a liquid chamber and is opened downward in FIG. 2, and the partition member 8 and the diaphragm 9 are attached to the open portion, and the inner wall and the partition member of the elastic main body member 7 are attached. 8, the elastic main body member 7 is a main liquid chamber 10 having a part of the elastic wall, the partition member 8 and the diaphragm 9 are sub liquid chambers 11, and the partition member 8 divides the liquid chamber into the main liquid chamber 10 and the sub liquid chamber 11. The liquid chamber 11 is partitioned.
[0020]
The elastic main body member 7 is an elastic wall that covers the main liquid chamber 10 and is formed to be relatively thin, and its film characteristics are set so as to generate a film resonance by vibration input in the middle frequency range. Yes. The partition member 8 includes a cylindrical portion 12 made of resin as appropriate, and a pressing plate 13 having a smaller diameter and fitting from the auxiliary liquid chamber 11 to the inside thereof. A first orifice passage 15 is formed on the outer periphery of the cylindrical portion 12. The main liquid chamber 10 and the sub liquid chamber 11 are always in communication and function as a damping orifice.
[0021]
The through hole 31 in the wall 30 on which is formed on the upper portion of the cylindrical portion 12 is provided, the elastic membrane 32 between the upper wall 30 and the pressing plate 13, in response to the hydraulic pressure of the surrounding fixed and the main liquid chamber 10 It is provided so as to be elastically deformable, thereby absorbing the internal pressure of the main liquid chamber 10.
[0022]
The cylindrical bush 2 has a plurality of side liquid chambers 20 (a pair of front and rear in this embodiment) whose outer wall is a part of the elastic wall on the outer periphery of the elastic main body member 7. The side liquid chamber 20 is open to the side and forms a substantially triangular space. The side liquid chamber 20 is integrally formed with the elastic body member 7 and is fitted into the end wall 21 and the side opening that extend in the substantially horizontal direction. The resin liquid chamber cover 22 to be joined is sealed.
[0023]
As shown in FIG. 3, the liquid chamber cover 22 is brought into close contact with the inner peripheral surface of the second mounting member 5 in an arc shape with a width of about ½ circumference. A groove 23 extending in the circumferential direction is provided on a surface (hereinafter referred to as an outer surface) of the liquid chamber cover 22 that is in contact with the second mounting member 5 and is opened to the second mounting member 5 side. A second orifice passage 24 is formed between the two.
[0024]
The second orifice passage 24 is formed in the circumferential direction along the inner surface of the second mounting member 5, and is an entrance that opens between the pair of side liquid chambers 20, 20 into the front side liquid chamber 20. 33 and the outlet 34 which opens to the side liquid chamber 20 on the rear side, is always in communication, and functions as a damping orifice similar to the first orifice passage 15.
[0025]
A pair of side liquid chambers 20, 20 facing each other is partitioned by an elastic partition wall 27. The elastic partition wall 27 extends to the opposite side on the Y axis at an interval of 180 ° with respect to the center portion, and the tip end portion is compressed and pressed to a seat portion 35 formed integrally with the liquid chamber cover 22. The liquid chamber cover 22 is divided into front and rear portions by a seat portion 35, and a notch portion 36 is formed at each connection end portion, and the tip end portion of the elastic partition wall 27 is fitted and fixed in the notch portion 36. Is done.
[0026]
Unlike the case of FIGS. 10 and 11, the elastic partition wall 27 is not formed with a straight portion, the upper portion is continuous with the end wall 21, and the lower portion is continuous with the elastic main body member 7. The elastic partition wall 27 is formed as a thin elastic wall having the same membrane resonance characteristics as the elastic main body member 7.
[0027]
A ring 37 having a U-shaped cross section is embedded and integrated at the tip of the elastic main body member 7. The ring 37 is positioned by abutting on the step portion 38 formed on the outer periphery of the cylindrical portion 12 constituting the partition member 8 with only the lower surface exposed, and the inner surface of the second mounting member 5 and the liquid chamber cover. The tip of the elastic main body 7 is in close contact with the lower end of the 22 and is sealed.
Further, a ring 39 is embedded and integrated in the outer peripheral portion of the end wall 21 and is fixed by a caulking portion 40 in which the upper end of the second mounting member 5 is bent inward.
[0028]
A portion of the second mounting member 5 below the partition member 8 forms a small diameter portion, and is provided on the outer peripheral edge portion of the partition member 8 to a step portion 42 formed at a boundary portion between the small diameter portion 41 and the upper portion thereof. A ring 37 is placed. The liquid chamber cover 22 is sandwiched between the upper and lower rings 37 and 39 and fixed by an upper caulking portion 40 . On the small diameter portion 41 side, the cylindrical portion 12 and the pressing plate 13 are stacked under the ring 37, and the enlarged portion formed on the outer periphery of the diaphragm 9 is stacked on the lower end portion of the pressing plate 13 to form the crimping portion 43. It is integrated.
[0029]
The elastic main body member 7, the end wall 21, and the elastic partition wall 27 constituting the cylindrical bush portion 2 are all continuously and integrally formed of the same single elastic member. Further, since these elastic materials are shared with the conical mount portion 1, the elastic material portion of the conical mount portion 1 excluding the diaphragm 9 and the elastic material portion of the cylindrical bush portion 2 are integrally formed. It becomes the insertion body 45 (FIG. 4), and can be handled as a single item when the engine mount is assembled.
[0030]
4 to 9 show the insert 45, and the end wall 21 is formed in a single disk shape, and as shown in FIG. Although not shown, the partition wall 8 and the diaphragm 9 are inserted from below and the upper and lower ends of the second mounting member 5 are crimped to be integrated.
[0031]
At this time, as shown in FIG. 8, the elastic partition wall 27 is formed long so as to be an imaginary line position protruding outward from the assembly position indicated by the solid line, and is pressed into the second mounting member 5 to be a solid line. Compressed toward the center in this state. Therefore, the dimension d shown in FIG. 8 is a tightening allowance, and the elastic partition wall 27 is compressed in the Y-axis direction and hardened by this tightening allowance, and the spring value in the left-right direction (Y-axis direction) is increased.
[0032]
This spring value can be arbitrarily adjusted by setting the tightening allowance, and is determined in relation to the respective spring ratios in the front-rear direction (X-axis direction) and the vertical direction (Z-axis direction) of the liquid seal vibration isolator as a whole. In the case of this embodiment, as an example, each spring ratio is
Up and down: Front and back: Left and right = 1.0: 1.0 to 1.3: 1.0 to 3.0
It is set to become. However, this spring ratio can be freely set depending on the vehicle to be mounted. However, it is desirable to adjust the left and right spring ratios in the range of 1.5 to 2.5.
[0033]
The spring value in the left-right direction is mainly when the elastic partition wall 27 is elastically deformed in the left-right direction due to left-right vibration of the vehicle. Similarly, the spring value in the front-rear direction is mainly when the elastic partition wall 27 is elastically deformed in the front-rear direction. The spring value in the vertical direction is that when the elastic body 7 is elastically deformed in the vertical direction.
[0034]
Next, the operation of this embodiment will be described. As shown in FIGS. 7 and 8, the elastic partition wall 27 is not provided with a straight portion but is made solid, and the end wall 21 is formed so as to form a single disk as a whole, and the elastic partition wall is assembled at the time of assembly. Since 27 is compressed in the center direction, the spring value in the left-right direction can be increased.
[0035]
In addition, the spring value in the left-right direction can be arbitrarily set by adjusting the tightening allowance. Therefore, it is possible to freely control the spring ratio in each direction of up / down: front / rear: left / right. Moreover, the sealing performance at the joint between the liquid chamber cover 22 and the elastic partition wall 27 can be enhanced by pressing the tip of the elastic partition wall 27 to the seat.
[0036]
FIG. 9 shows a modification of the fixing structure for the tip of the elastic partition wall 27. In this example, a protrusion 46 is provided that protrudes from the seat and engages the tip of the elastic partition wall 27. The inner surface 47 is tapered so that the space formed between the elastic partition walls 27 forms a taper angle α such that the space gradually decreases outward.
[0037]
In this way, when the elastic partition wall 27 is elastically deformed in the front-rear direction, the spring value is set so that the amount of elastic deformation can be increased for small vibrations. When in contact, the spring value can be changed nonlinearly by restricting further elastic deformation and increasing the spring value. In addition, the spring value at the time of a large vibration can be arbitrarily set by adjusting the taper angle of the inner surface and the amount of inward protrusion.
[0038]
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, it is also effective in a liquid seal vibration isolator having only the cylindrical bush portion 2 without the conical mount portion 1. In this case, in the state of use as in the above embodiments, the front and rear and left and right directions 2 The spring ratio of the direction can be controlled.
[0039]
Further, the cylindrical bush portion 2 can be arranged arbitrarily. For example, the cross-sectional direction of the elastic partition wall 27 in FIG. 7 can be arranged in the front-rear direction or the vertical direction of the vehicle body. Is different from the above.
[0040]
Furthermore, the seat portion can be provided on the first attachment portion 3 side, and the elastic partition wall 27 can be pressed against the first attachment portion 3 side. Further, the elastic partition wall 27 can be formed separately from the elastic main body portion 7 and can be brought into pressure contact with the first attachment portion 3 and the second attachment portion 5 respectively.
[Brief description of the drawings]
1 is a plan view of an engine mount according to an embodiment. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 5 is a plan view of the insert body. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. 5. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. FIG. 10 is a diagram showing the same part as FIG. 8 according to another embodiment. FIG. 10 is a diagram similar to FIG. 1 according to the preceding example. FIG. 11 is a sectional view taken along line 11-11 in FIG.
1: Conical mount portion, 2: Cylindrical bush portion, 3: First mounting member, 5: Second mounting member, 7: Elastic body member, 8: Partition member, 10: Main liquid chamber, 11: Sub Liquid chamber, 15: first orifice passage, 20: side liquid chamber, 21: end wall, 22: liquid chamber cover, 24: second orifice passage, 35: seat, 45: insert

Claims (4)

A first attachment member attached to either the vibration generating side or the vibration receiving side; a second attachment member attached to either one of the sides and surrounding the first attachment member in a substantially cylindrical shape ; A substantially conical elastic main body member for connecting the first and second mounting members, a liquid chamber having the elastic main body member as a part of an elastic wall, and a partition member configured to form a main liquid chamber. A conical mount portion is provided which is divided into sub liquid chambers and communicates between the main liquid chamber and the sub liquid chambers through a first orifice passage, and the elastic main body member is attached to the outer peripheral portion of the elastic main body member. A plurality of side liquid chambers shared as a part are provided at predetermined intervals in the circumferential direction, and a cylindrical bush part is provided by connecting each of these side liquid chambers by a second orifice passage. While integrating the conical mount part By providing an elastic partition wall that divides the plurality of side liquid chambers and connects the first and second mounting members, and presses the elastic partition wall toward the first or second mounting member side. , Compressing between the first or second mounting members to adjust the spring ratio in the direction connecting the first and second mounting members and the direction substantially orthogonal thereto , and the elastic partition wall is the elastic A liquid seal vibration isolator which is continuous with an outer peripheral portion of a main body member . 2. The liquid seal vibration isolator according to claim 1 , wherein a protrusion for fitting the pressure contact end portion of the elastic partition wall is provided on a seat portion to which the elastic partition wall is pressed, and the protrusion and the elastic partition wall are provided between the protrusion and the elastic partition wall. A liquid seal vibration isolator characterized in that a predetermined gap is provided on the surface. The input direction of the main vibration of the conical mount part is the Z-axis direction, the two axis directions orthogonal to each other and the two axis directions orthogonal to each other are the XY axis direction, and the cross section orthogonal to the Z-axis direction direction of the cylindrical bush part When the direction connecting the first and second mounting members is the Y-axis direction,
The side liquid chamber is surrounded by the elastic main body member and an end wall facing the elastic main body member, and the elastic partition wall extends in the Z-axis direction continuously to the outer peripheral portion of the elastic main body member and the end wall. The liquid seal vibration isolator according to claim 1 . The side liquid chamber is closed at the opening by a liquid chamber cover, and the liquid chamber cover is provided in a pair of semicircular circles, and the elastic partition wall is fitted at the mating portion of both liquid chamber covers 2. The liquid seal vibration isolator according to claim 1, wherein the liquid seal vibration isolator is compressed.

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