JP4173607B2 - Liquid-filled vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid-filled vibration isolator used mainly for supporting a vibration generator such as an automobile engine.
[0002]
[Prior art]
As a liquid-filled vibration isolator such as an engine mount that supports the vibration of a vibration generating body such as an automobile engine so as not to be transmitted to the vehicle body side, an upper mounting bracket attached to the engine side and a cylindrical shape attached to the vehicle body side A liquid chamber formed between a lower mounting bracket, a vibration-proof base made of a rubber-like elastic body that connects both the mounting brackets, and a diaphragm on the vibration-proof base and the lower mounting bracket side is divided into a main liquid chamber and a sub-mounting chamber. A partition for partitioning from the liquid chamber;
The partition is provided with an orifice formed so as to communicate the main liquid chamber and the sub liquid chamber, and exhibits a vibration damping function and a vibration insulation function by the vibration isolating substrate due to the liquid flow effect of both liquid chambers by the orifice. What is made to let you do is known.
[0003]
The lower mounting bracket of the above-mentioned liquid-filled vibration isolator is formed by caulking and fastening a cylindrical barrel having an upper side and a lower side expanded and a middle barrel formed by drawing, and a bottomed cylindrical bracket on the lower side. The partition body inserted into the body part, which is the smallest diameter part of the tubular body fitting, is in contact with the liquid chamber side peripheral surface of the vibration isolating base, and the lower end is tubular. It is fastened together with the diaphragm to the caulking fastening portion of the metal fitting, and is positioned in the height direction.
[0004]
[Problems to be solved by the invention]
By the way, the cylindrical body bracket of the lower mounting bracket is a cylindrical body whose upper and lower ends are expanded and the intermediate body portion is formed by drawing. The size of the orifice formed in the body is also limited, affecting the vibration damping characteristics. In addition, the drawing mold of the cylindrical body fitting tends to be expensive.
[0005]
[Means for Solving the Problems]
As a result of reviewing and examining the structure of the cylindrical lower mounting bracket, the present inventors focused on the above problems, and as a result, divided the cylindrical barrel fitting into which the partition body is inserted into the lower mounting bracket into two in the vertical direction. In the structure, it has been found that each of the divided metal parts may be drawn separately, and the drawing height, thickness, and material can also be set freely and inexpensively.
[0006]
Further, if the joining portion of each divided metal fitting is bent inward in the radial direction to form a joining flange, and this joining flange is joined to each other, joining can be performed easily. The joining means of the divided metal fittings is not particularly limited, and can be exemplified by welding or caulking.
[0007]
The location of the joint flange can be set as appropriate in the height direction of the vibration isolator base, but the upper side of the joint flange is the main rubber part of the vibration isolator base, and the lower side of the joint flange forms a peripheral wall of the liquid chamber. It is preferable that the liquid chamber rubber portion be a body insertion portion. Further, if the partition body is brought into contact with the lower liquid chamber rubber portion of the joining flange, it is not necessary to take a compression allowance due to the pressure contact of the partition body with the main body rubber portion, and the distortion of the liquid chamber R portion with which the partition body abuts. , And positioning and fixing of the partition body can be easily and stably secured.
[0008]
The structure and material of the partition in this case are not particularly limited, and any of metal and resin can be adopted as the material, and either a one-piece structure or an upper and lower divided structure can be adopted. The number of orifices formed in the partition may be either singular or plural (for example, two). For example, a partition body in which a second diaphragm is bonded to a central portion of an aluminum casting body having a first orifice formed on the outer peripheral portion, and the second orifice is formed in cooperation with the second diaphragm. Can be mentioned.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
FIG. 1 is a cross-sectional view of a liquid-filled vibration isolator, and FIG. 2 is a perspective view of a partition. The liquid-filled vibration isolator 1 according to the present embodiment includes an upper mounting bracket 2 that is attached to a vibration generator such as an engine, a lower mounting bracket 3 that is attached to a vehicle body, and both the mounting brackets 2 and 3. A vibration isolating base 4 made of a rubber-like elastic body to be connected, and a first mounting chamber 3 facing the anti-vibration base 4 on the lower mounting bracket 3 side and constituting the liquid chamber 5 with the anti-vibration base 4. A diaphragm 6, a partition body 7 that divides the liquid chamber 5 into a main liquid chamber 5 a and a sub-liquid chamber 5 b, and two orifices 8 and 9 formed in the partition body 7, 9 exhibits a vibration damping function in different frequency ranges and a vibration insulating function by the vibration isolating substrate 4.
[0010]
The upper mounting bracket 2 is formed in a flat plate shape, and a mounting bolt 10 that protrudes upward and supports an engine or the like is fixed to the center of the upper mounting bracket 2. Further, in order to absorb a large displacement, a base end portion of a stopper bracket 11 (stabilizer bracket) having a cross-section protruding in a lateral direction is positioned and fixed on the upper surface of the upper mounting bracket 2 by screws 12. Yes.
[0011]
The lower mounting bracket 3 has an outer flange 13a that is widened at the upper end, a bottomed cylindrical metal fitting 13 having a mounting bolt 15 fixed to the vehicle body at the bottom, and a lower end portion of the outer flange 13a. It is comprised from the cylindrical trunk | drum 14 fastened from the outside.
[0012]
The cylindrical shell 14 is divided into two in the vertical direction at the body portion which is the smallest diameter portion, and is composed of an upper divided bracket 16 and a lower divided bracket 17. Are joined to each other, and the joining flange portions 18 and 19 are welded to each other.
[0013]
The upper end of the upper divided metal member 16 is expanded outwardly in a tapered shape, and a stopper flange 20 is formed at a part of the upper end of the expanded portion 16a so as to face the tip of the stopper metal member 11.
[0014]
A fastening flange 17 a is expanded at the lower end of the lower split metal fitting 17, and the first diaphragm 6 and the partition 7 are interposed between the fastening flange 17 a and the outer flange 13 a of the bottomed tubular metal fitting 13. The outer periphery of the lower partition member 31 is sandwiched. A fastening portion 23 extends from the distal end of the fastening flange 17a. The fastening portion 23 is caulked and fastened so that the outer flange 13a of the bottomed tubular metal fitting 13 is inserted into the fastening flange 17a so as to surround from the outside. As a result, the cross-section has a U-shaped cross section.
[0015]
Each of the joining flanges 18 and 19 is bent inward at substantially right angles from the ends of the divided metal fittings 16 and 17, and the protruding length of the inner end is the length of the cross-sectional width of the first orifice 8 on the outer peripheral side. It is set to substantially the same length, and also serves as a reinforcing metal fitting for preventing the upward displacement of the partition 7.
[0016]
Each of the divided metal parts 16 and 17 is formed by drawing the body part, bending the joint flanges 18 and 19 by press forming or the like, and fixing them by welding to complete the cylindrical body part 14. To do. Any of the divided metal fittings 16 and 17 may be appropriately selected according to the required characteristics and the mounting height.
[0017]
The anti-vibration base 4 has a rubber-like elastic body formed in an umbrella shape, and is vulcanized and bonded to the upper mounting bracket 2 and the lower mounting bracket 3. Specifically, a rubber-like elastic body is vulcanized and bonded between the lower surface of the upper mounting bracket 2 and the inner surface of the cylindrical body bracket 14, and further includes the joining flanges 18 and 19 and the inner surface of the lower divided bracket 17. The thin rubber elastic body is vulcanized and bonded. The upper rubber-like elastic body from the joining flanges 18 and 19 constitutes the main body rubber part, and the lower rubber-like elastic body from the joining flanges 18 and 19 constitutes the liquid chamber rubber part 24 into which the partition body 7 is inserted. is doing. The upper surface of the outer periphery of the partition 7 is brought into contact with the thin film rubber portion below the joining flanges 18 and 19 so as to be positioned in the upward direction.
[0018]
Further, the rubber-like elastic body surrounds the stopper flange 20 of the cylindrical body fitting 16 and extends to a position facing the inner surface of the tip end of the stopper fitting 11, and this extending portion serves as a large displacement absorbing stopper portion 25. Yes. A reinforcing metal fitting 26 is embedded in the stopper portion 25 between the stopper flange 20 and the stopper metal fitting 11.
[0019]
The first diaphragm 6 has a flexible rubber-like elastic film, and an inner end of an annular diaphragm fitting 28 is embedded and integrated in the outer peripheral portion thereof. The fitting 28 is an outer flange of the bottomed tubular fitting 13. 13a. The space surrounded by the first diaphragm 6, the lower surface portion of the vibration isolating base 4 and the liquid chamber rubber portion 24 is defined as a liquid chamber 5, and a partition body 7 is disposed so as to partition the liquid chamber 5 vertically. ing.
[0020]
As shown in FIGS. 1 and 2, the partition body 7 includes three members, that is, an upper partition member 30, a lower partition member 31, and a rubber-like member 32, and an outer peripheral end portion of the lower partition member 31 is radially outward. The extended portion 31 a is caulked and fixed to the fastening portion 16 of the lower mounting bracket 3, while the upper peripheral edge of the upper partition member 30 is pressed by the lower rubber portion of the joining flanges 18 and 19. The partition 7 is positioned.
[0021]
The upper partition member 30 is an annular molded product made of aluminum, and is formed with a first orifice groove 33 having a U-shaped cross-section opened in the peripheral side surface thereof in a substantially circumferential direction, and its peripheral wall 37 and top wall 38. In addition, a second orifice groove 40 having an open U-shaped cross section is formed by the peripheral wall 39 of the rubber member 32.
[0022]
A space surrounded by the first orifice groove 33 and the inner peripheral wall of the liquid chamber rubber portion 24 of the vibration isolating base 4 is defined as the first orifice 8 inside the first orifice groove 33. The first orifice groove 33 has a main liquid chamber side inlet / outlet 34 formed in the upper end wall portion thereof, and a communication hole 35 communicating with the sub liquid chamber side in the lower end wall portion thereof. A partition vertical wall (not shown) that prevents a short circuit between the side entrance 34 and the communication hole 35 is formed so as to close the first orifice groove 33.
[0023]
The rubber-like member 32 is made of rubber or resin elastomer and has an annular peripheral wall 39 that forms a second orifice groove 40 between the upper partition plate member 30 and a circular arc on the main liquid chamber side on the inner side of the peripheral wall 39. A second flexible diaphragm-like diaphragm 41 formed in a concave shape is integrally vulcanized and molded, and the upper peripheral portion of the peripheral wall 39 is vulcanized and bonded to the inner surface of the top wall 38 of the upper partition member 30. Has been.
[0024]
The lower end portions of the peripheral walls of the upper partition member 30 and the rubber member 32 are pressed against the lower partition member 31 to close the second orifice groove 40, so that the space portion becomes the second orifice 9. The second orifice 9 communicates with the second sub-liquid chamber 5c surrounded by the second diaphragm 41 and the lower partition member 31 through an opening 42 formed in the peripheral wall 39 of the rubber member 32, and The first auxiliary liquid chamber 5 b communicates with the opening 43 formed in the lower partition member 31. The second orifice groove 40 has a rubber-like vertical wall (not shown) that prevents the second sub liquid chamber side opening 42 and the first sub liquid chamber side opening 43 of the peripheral wall 39 from short-circuiting. Is provided.
[0025]
The lower partition member 31 is a metal disk-shaped flat plate and has a function of closing the second orifice groove 40 of the rubber-like member 32 from the lower side on the inner side of the upper partition member 30. The outer peripheral portion is formed so as to be in contact with the lower surface of the upper partition member 30 (the lower end wall portion of the first orifice groove 33) so as to be pressed upward. An opening 44 is formed which communicates with the 33 communication holes 35 and opens into the first sub-liquid chamber 5b. Then, the outer peripheral side of the lower partition member 31 is extended and fixed by caulking to the fastening portion 23 of the lower mounting bracket 3.
[0026]
The above-described liquid-filled vibration isolator 1 includes an assembly formed by vulcanizing and bonding a cylindrical body bracket 14 formed by welding and fixing the divided brackets 16 and 17 and the upper mounting bracket 2 with a vibration-proof base 4 in a liquid. The upper partition member 30 to which the rubber-like member 32 is vulcanized and bonded is disposed along the liquid chamber rubber portion 24 in a state where the lower opening of the cylindrical shell 14 is set upward and the air inside is excluded. Press-fit until the outer peripheral edge of the upper end reaches the lower rubber part of the joint flanges 18, 19. From there, the lower partition member 31 and the first diaphragm 6 are press-fitted or inserted into the fastening part 23, these are taken out into the atmosphere and the residual liquid is adjusted, and then the bottomed cylindrical fitting 13 is placed in the fastening part 23. When the flanges 13a are fitted and fixed by caulking, the assembly is completed.
[0027]
In the liquid-filled vibration isolator 1, the cylindrical body fitting 14 into which the partition body 7 is inserted has an upper and lower divided structure. Therefore, the divided fittings 16 and 17 may be drawn separately, and the drawing height is reduced. In addition, the plate thickness and material can be set freely, and can be set at a low cost by sharing parts. Further, since the partition body 7 is brought into contact with the lower liquid chamber rubber portion of the thin film of the joining flanges 18 and 19, it is not necessary to take a compression allowance due to the pressure contact of the partition body 7 with the main body rubber portion of the vibration isolating base 4. In addition, the distortion of the liquid chamber R portion on the outer peripheral edge with which the partition 7 abuts can be reduced, and the alignment and fixing of the partition 7 can be performed easily and stably.
[0028]
[Second Embodiment]
FIG. 3 is a cross-sectional view showing a cylindrical metal fitting of the vibration isolator showing the second embodiment. As shown in the figure, in the present embodiment, the caulking and fixing method of both is adopted as the joining means of the divided metal members 16 and 17 of the cylindrical metal member 14.
[0029]
That is, in this embodiment, the inner end of the lower joint flange 19 is bent upward, and the joint flange 18 of the upper divided metal fitting 16 is clamped and fixed by the bent portion 46. As in the first embodiment, the dimensions of the divided bodies 16 and 17 can be selected as appropriate according to required characteristics and mounting height, and the cost can be reduced by sharing parts. Other configurations and operations are the same as those in the first embodiment.
[0030]
【The invention's effect】
As is apparent from the above description, according to the present invention, among the lower mounting brackets connected by the vibration isolating base, the cylindrical bracket for inserting the partition body is divided into two parts in the vertical direction, and each divided bracket is separated. The drawing height, plate thickness, and material can be freely set, and the contact portion of each divided bracket is bent inward in the radial direction to form a joint flange. Can also be done easily.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a liquid-filled vibration isolator showing a first embodiment of the present invention. FIG. 2 is a perspective view of the partition body. FIG. 3 is a perspective view of a cylindrical metal fitting showing a second embodiment. Sectional view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid enclosure type vibration isolator 2 Upper mounting bracket 3 Lower mounting bracket 4 Anti-vibration base 5 Liquid chamber 5a Main liquid chamber 5b Sub liquid chamber 6 First diaphragm 7 Partition 13 Bottomed cylindrical bracket 14 Cylindrical shell 16 Upper split bracket 17 Lower split bracket 18, 19 Joint flange

Claims (6)

An upper mounting bracket and a cylindrical lower mounting bracket are connected by a vibration-proof base made of a rubber-like elastic body, and a liquid chamber formed between the vibration-proof base and the diaphragm on the lower mounting bracket side is a main liquid. A liquid-filled vibration isolator provided with a partition that divides the chamber into a sub-liquid chamber,
Among the lower mounting brackets, the cylindrical body fitting that inserts the partition body is divided into two in the vertical direction, and a joining flange that is bent radially inward is formed at the contact portion of both divided fittings, A liquid-filled vibration isolator in which the joining flanges are joined together. The liquid-filled vibration isolator according to claim 1, wherein the joining flange is joined by welding. The liquid-filled vibration isolator according to claim 1, wherein the joining flange is joined by caulking. The upper side of the joint flange constitutes the main rubber part of the vibration isolating base, and the lower side of the joint flange part forms the peripheral wall of the liquid chamber, and constitutes the liquid chamber rubber part serving as the insertion part of the partitioning body. The liquid-filled vibration isolator according to claim 1, 2 or 3. The liquid-filled vibration isolator according to claim 4, wherein the partition is in contact with a lower liquid chamber rubber portion of the joint flange. The liquid-filled vibration isolator according to any one of claims 1 to 5, wherein the partition is formed with two orifices that communicate the main liquid chamber and the sub liquid chamber.

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