JP3775086B2 - Liquid filled vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid-filled vibration isolator, and more particularly to a liquid-filled vibration isolator suitable for industrial vehicles such as excavators and automobile mounts.
[0002]
[Prior art]
Conventionally, as this type of liquid-filled vibration isolator, for example, the one shown in FIG. 7 is known. The vibration isolator is a rod-shaped support fitting 1 having an injection through-hole 6 penetrating in the axial direction, and is arranged coaxially so as to be spaced apart from the outer periphery thereof, and extends radially outward to one axial end. The outer peripheral side, which is fixed to the other end side of the support metal fitting 1 with a flange portion 2a and the other end of the outer metal fitting 2 with a gap, is curved downward. A substantially cylindrical rubber elastic body 4 that is vulcanized and formed between the outer metal fitting 2 and the support metal fitting 1 to connect the attenuation plate 3 and a space between the attenuation plate 3; A bottomed cylindrical metal container disposed outside the outer metal fitting 2 is provided with a container metal fitting 5 having an outer flange portion 5a on the open end. The outer metal fitting 2 is press-fitted through the rubber elastic body 4 provided, and both the flange portions 2a and 5a are fixed. It is assembled form. A liquid, for example, silicon oil, is injected into the container fitting 5 while removing air from the injection through hole 6, and the through hole 6 is sealed with a predetermined amount of air remaining after the injection. It is formed in the device. As the liquid to be sealed, a liquid such as highly viscous silicone oil having a viscosity of about 5,000 to 300,000 cSt (centistokes) is used.
[0003]
Further, as shown in FIG. 8, another liquid-filled vibration isolator having the same shape is provided with a shaft on the bottom wall of the container fitting 6 and the horizontal portion of the damping plate 3 instead of providing the injection through hole in the support fitting 1. Through holes 7 and 8 are provided on the same axis in the direction, respectively, and a liquid syringe is inserted into the through holes 7 and 8 to inject liquid while venting air.
[0004]
This liquid-filled vibration isolator is used for, for example, a large industrial vehicle such as a hydraulic excavator, and the container fitting 5 is fixed to the vehicle body side of the hydraulic excavator car and the support fitting 1 is fixed to the cabin chamber side. It is designed to prevent vibration from the vehicle body side from reaching the cabin by the elastic action of the rubber elastic body and the elastic action of the highly viscous liquid, and is usually used for applications that require high damping characteristics. ing.
[0005]
[Problems to be solved by the invention]
However, since all of the above-mentioned liquid-filled vibration isolators must be vented together with the injection operation for each vibration isolator, injection equipment such as a large number of liquid injectors is necessary for mass production. Cost becomes expensive. Furthermore, since the liquid is highly viscous, there is a problem in that the time for injecting the liquid into the vibration isolator including the air vent becomes long, so that the productivity is low and the manufacturing cost is high. In addition, liquid leakage tends to occur with liquid injection, and the trouble of wiping the liquid is complicated. Furthermore, if liquid adheres to the outside of the metal fitting due to liquid leakage, there is also a problem that pretreatment is required because the adhesion of the paint to the metal fitting becomes worse in the rust preventive coating in the subsequent process.
The present invention is intended to solve the above-described problem. A liquid-filled vibration isolator capable of preventing liquid leakage by eliminating the need for liquid injection equipment, reducing the equipment cost, facilitating assembly, low production cost, and preventing liquid leakage. The purpose is to provide.
[0006]
[Means for Solving the Problems and Effects of the Invention]
In order to achieve the above object, the structural feature of the invention described in claim 1 is that it is arranged in a coaxial manner spaced apart from the outside of the support metal fitting and the support metal fitting, and has a diameter on one end side in the axial direction. A disk-shaped outer metal fitting having a first flange portion extending outward in a direction and a disc-like member that is fixed to the other end of the support metal fitting and spaced from the other end of the outer metal fitting. The damper plate is vulcanized between the outer bracket and the support bracket to connect the two brackets, while closely contacting the outer periphery of the damper plate and forming an annular space between the damper plate on the radially inner side. A cylindrical rubber elastic body provided with a vent hole that communicates with the outside in at least one place in the circumferential direction at a portion that is formed and in close contact with the damping plate, and a thin rubber layer provided on the outer peripheral surface of the outer metal fitting An outer rubber which is provided with a groove in a portion communicating with the vent hole and extending from the vent hole to the intermediate position in the axial direction. Intermediate components comprising a Lumpur portion and, a bottomed cylindrical metal container having an inner diameter smaller than the outer diameter of the outer rubber seal portion, a second flange portion extending radially outwardly to an open end A liquid-filled vibration isolator comprising a container fitting provided with an air vent at an intermediate position in the axial direction of the cylindrical side wall, wherein the container fitting contains a predetermined amount of liquid. The intermediate component is press-fit until the first flange portion comes into contact with the second flange portion with the vent hole and the air vent hole aligned in the axial direction coaxially from the attenuation plate side, and the intermediate component and the container The metal fitting is fixed liquid-tightly via the outer rubber seal portion, and then the air vent hole is sealed.
[0007]
In the invention of claim 1 configured as described above, the intermediate component is coaxially arranged from the damping plate side in the container fitting containing the liquid, and the ventilation hole of the rubber elastic body and the air vent hole of the container fitting are axial. By press-fitting until the first flange part abuts on the second flange part in a state aligned in the direction, excess air accumulated in the space between the damping plate and the rubber elastic body in the container fitting is changed according to the press-fitting. The air can be smoothly discharged from the air vent hole through the vent hole and the groove. In addition, since the amount of liquid stored in the container fitting is adjusted to a predetermined amount in advance , leakage of liquid from the air vent hole to the outside of the container can be prevented during press fitting.
[0008]
As a result, according to the first aspect of the present invention, since the air inside the container fitting is also released at the same time by press-fitting the intermediate component into the container fitting, a complicated liquid injection facility becomes unnecessary, and the equipment cost can be reduced. . Furthermore, since the air is smoothly vented simultaneously with the press-fitting operation, the time for assembling the intermediate component including the liquid filling to the container fitting can be greatly shortened, and the manufacturing cost can be reduced. Further, since leakage of the liquid to the outside can be prevented, the liquid does not adhere to the container fitting or the like, so that the trouble of wiping off the liquid can be saved and the fitting can be reliably applied.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a cab mount (liquid-filled vibration isolator) for a hydraulic excavator according to the embodiment in plan and sectional views. 3 and 4 show a vulcanized product constituting the cab mount with a plan view and a cross-sectional view.
[0010]
The cab mount is composed of a support fitting 10, an intermediate fitting 15 spaced coaxially on the outer peripheral side, a coaxial fitting spaced outwardly, and radially outward on one axial end. A cylindrical outer metal fitting 20 having a first flange portion 22 extending in the direction, a rubber elastic body 30 vulcanized and connected between the outer metal fitting 20 and the support metal fitting 10, and a rubber elastic body 30. The vulcanized rubber molded body M formed of the outer rubber seal portion 40 formed on the outer peripheral surface of the outer metal fitting 20 by vulcanization molding is fixed to the other end of the support metal fitting 10 and connected to the other end of the outer metal fitting 20. An intermediate component N including an attenuation plate 16 disposed to face the entire circumference, and a bottomed cylindrical metal container having an inner diameter slightly smaller than the outer diameter of the outer rubber seal portion 40 and a shaft Having a second flange 53 extending radially outward at one end in the direction Finished products N is a container housing 50 to be press-fitted.
[0011]
The support metal fitting 10 is a substantially cylindrical metal fitting, and as shown in FIG. 4, a main body 11 in which a mounting hole 12 having a screw groove at an axial center position is formed on one end side in the axial direction (upper end in the figure), and a shaft A cylindrical fixing portion 13 that protrudes coaxially on the other end side in the direction (lower end in the figure) is provided. The outer diameter of the fixed portion 13 is substantially half of the outer diameter of the main body 11. On the outer side of the main body 11 of the support metal 10, a cylindrical and thin intermediate metal 15 is coaxially disposed between both ends of the main body 11 and spaced from the main body. In addition, a cylindrical outer metal fitting 20 is coaxially disposed on the outer side of the intermediate metal fitting 15 so as to be separated from the intermediate metal fitting 15.
[0012]
The outer metal fitting 20 is provided with a cylindrical portion 21 and a square plate-like first flange portion 22 extending radially outward at one axial end thereof, and the axial length is shorter than that of the intermediate metal fitting 15. The other end in the axial direction is located slightly outward (downward in the drawing) from the other end of the intermediate fitting 15. Attachment holes 23 are provided at the four corners of the first flange portion 22. Further, on the other end side of the outer metal fitting 20, an end hole 24 cut out in a substantially inverted U shape toward the axial direction is provided at one predetermined circumferential position. A cylindrical rubber elastic body 30 is provided between the support fitting 10 and the outer fitting 20 including the intermediate fitting 15, and these are integrally connected.
[0013]
The rubber elastic body 30 has one end in the axial direction located in the vicinity of one end side of the body 11 of the support fitting 10 above the one end in the axial direction of the intermediate fitting 15, and the other end in the axial direction from the other end in the axial direction of the outer fitting 20. It is located at the same position as the other end of the main body 11 which is the lower side. Further, the rubber elastic body 30 has an outer periphery on one end side in the axial direction positioned substantially in the middle of the first flange portion 22 in the radial direction, and an outer peripheral position on the other end side is set to the same position as the outer peripheral position of the outer metal fitting 20. ing. The rubber elastic body 30 has annular recesses 31 and 32 in which the inner portions in the radial direction are slightly recessed from the inner peripheral surface of the outer metal fitting 20 in the axial direction at both ends in the axial direction. In addition, the cross-sectional shape perpendicular to the axes of the recesses 31 and 32 is substantially W-shaped through the intermediate fitting 15. The outer sides in the radial direction of the concave portions 31 and 32 on both ends in the axial direction of the rubber elastic body 30 are annular convex portions 33 and 34. Further, as shown in detail in FIG. 5, the annular convex portion 34 on the other end side (the lower side in the drawing) is located at the position of the end hole 24 of the outer metal fitting 20, and at the position of the end hole 24 approximately half the axial length. A vent hole 35 extending in the radial direction is formed.
[0014]
Further, on the outer peripheral side of the outer metal fitting 20, a thin outer rubber seal portion 40 is provided at a portion extending from the radial intermediate position of the first flange portion 22 to the end of the annular convex portion 34. The outer rubber seal portion 40 is provided with a groove portion 41 that extends in the axial direction from the vent hole 35 and from which the portion of the outer metal fitting 20 that reaches a substantially intermediate position in the axial direction is removed. The outer rubber seal portion 40 is provided with two ring-shaped seal ring portions 42 that protrude coaxially in the radial direction at a position slightly away from the tip of the groove portion 41 toward one end side in the axial direction. The outer rubber seal portion 40 is integrally formed with the rubber elastic body 30 by performing vulcanization molding in a state where the support metal fitting 10, the intermediate metal fitting 15 and the outer metal fitting 20 are set in a molding die, and the vulcanization shown in FIG. It is formed as a rubber molded body M.
[0015]
In this vulcanized rubber molded body M, as shown in FIG. 6, a damping plate 16 which is a metal disk and has a through hole 16b in at least one place is provided on the fixing portion 13 on the other end side of the support fitting 10. It is mounted by inserting the center hole 16a, and is fixed to the support metal fitting 10 by bending the tip of the fixing portion 13 to the outside, and is formed as an intermediate component N. Thereby, a space 37 is formed between the damping plate 16 and the recess 32, and the space 37 communicates with the vent hole 35 of the rubber elastic body 30.
[0016]
The container fitting 50 is a bottomed cylindrical metal container, and has a cylindrical main body 51 whose inner diameter is larger than the outer diameter of the outer fitting 20 and smaller than the outer rubber seal portion 40, and the other end side in the axial direction. And a convex plate-like bottom plate portion 52 that is provided integrally with the first flange portion 22 that extends outward in the radial direction at the opening end on the one end side in the axial direction. Two flange portions 53 are provided. The second flange portion 53 is also provided with mounting holes (not shown) at the four corners. Further, an air vent hole 54 penetrating the side wall is formed at an axially intermediate position of the side wall of the main body 51. In addition, a pair of locking pieces 55 (bent in FIGS. 1 and 2) protruding outward are provided at an intermediate position between two opposing sides of the second flange portion 53.
[0017]
Next, the assembly of the cab mount will be described.
In the state where the liquid L such as highly viscous silicone oil having a viscosity of 5,000 to 300,000 cSt is accommodated in the container fitting 50 in an adjusted amount, the intermediate component N is placed from the attenuation plate 16 side into the container fitting. 50 is press-fitted coaxially. This press-fitting operation is performed with the first flange portion 22 and the second flange portion 53 in a state where the air vent hole 54 of the container fitting 50 and the vent hole 35 of the intermediate component N are aligned on the same line in the axial direction. It is done until it touches. Therefore, during the press-fitting operation, excess air accumulated in the container fitting 50 and the space 37 of the intermediate component N passes through the vent hole 35 of the rubber elastic body 30 and further continues to the vent hole 35. And is smoothly discharged to the outside through the air vent hole 54 provided in the container fitting 50. Further, since the amount of the liquid L accommodated in the container fitting 50 is adjusted to a predetermined amount, it is possible to prevent leakage of the liquid L to the outside of the container fitting 50 in the press-fitting.
[0018]
Thereafter, the pair of locking pieces 55 of the container fitting 50 are folded back and locked to the first flange portion 22, whereby the intermediate component N is fixed to the container fitting 50 via the outer rubber seal portion 40 in a liquid-tight manner. Further, by sealing the air vent hole 54 of the container fitting 50 with a stopper, a cab mount in which the liquid L is sealed while leaving a predetermined amount of air inside is formed.
[0019]
The cab mount assembled in this way is supported by fixing the first and second flange portions 22 and 53 of the outer metal fitting 20 and the container metal fitting 50 to the vehicle body side of the hydraulic excavator car via the mounting holes 23 by screws or the like. The metal fitting 10 is fixed to the cabin chamber side by screws. Then, the vibration is prevented so that the vibration from the vehicle body does not reach the cabin due to the elastic action of the rubber elastic body or the elastic action of the highly viscous liquid.
[0020]
As described above, in the above embodiment, the intermediate component N is coaxially arranged from the damping plate 16 side and the vent hole 35 of the rubber elastic body 30 and the container fitting in the container fitting 50 containing the liquid L. By inserting the first flange portion 22 into contact with the second flange portion 53 in a state where the 50 air vent holes 54 are aligned in the axial direction, there is no need to accumulate in the space portion 37 on the damping plate 16 in the container fitting 50. The air can be smoothly discharged from the air vent hole 54 to the outside through the vent hole 35 and the groove portion 41 according to the press-fitting.
[0021]
As a result, when the intermediate component N is press-fitted into the container fitting 50, the air inside the container fitting 50 is also vented at the same time, so that no liquid injection facility including air venting is required, and the equipment cost can be reduced. Further, since air is smoothly vented during press-fitting, the time for assembling the intermediate component N to the container fitting 50 can be greatly shortened, and the manufacturing cost can be reduced. Further, since the leakage of the liquid L to the outside of the container fitting 50 can be prevented, the liquid does not adhere to the container fitting 50 and the like, the labor of wiping off the liquid can be saved, and the fitting can be reliably applied. .
[0022]
In the above embodiment, one vent hole 35 and one air vent hole 54 are provided, but two or more vent holes 35 and air vent holes 54 may be provided.
Further, the specific structure and the like of the liquid-filled vibration isolator shown in the above embodiment are not limited to this, and can be changed as appropriate.
[Brief description of the drawings]
FIG. 1 is a plan view schematically showing a cab mount according to an embodiment of the present invention.
2 is a cross-sectional view taken along line II-II shown in FIG.
FIG. 3 is a front view schematically showing a vulcanized rubber molded body obtained by performing rubber vulcanization molding integrally with a support metal fitting, an intermediate metal fitting and an outer metal fitting.
4 is a cross-sectional view taken along line IV-IV shown in FIG.
5 is an arrow view in the X-ray direction and the Y-ray direction shown in FIG. 4, which is a main part of a vulcanized rubber molded body.
FIG. 6 is a cross-sectional view showing an intermediate component.
FIG. 7 is a cross-sectional view showing a conventional cab mount.
FIG. 8 is a cross-sectional view showing a cab mount as another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Support metal fitting, 11 ... Main body, 13 ... Fixing part, 15 ... Intermediate metal fitting, 16 ... Damping plate, 16b ... Through-hole, 20 ... Outer metal fitting, 21 ... Cylindrical part, 22 ... 1st flange part, 24 ... End part Holes 30 ... Rubber elastic bodies 31, 32 ... Recesses 33, 34 ... Annular projections 35 ... Vent holes 37 ... Space parts 40 ... Outer rubber seal parts 41 ... Groove parts 50 ... Container fittings 51 ... Main body 53 ... 2nd flange part, 54 ... Air vent hole, 55 ... Locking piece, L ... Liquid, M ... Vulcanized rubber molded object, N ... Intermediate component.

Claims (1)

A rod-shaped support bracket;
A cylindrical outer metal fitting having a first flange portion that is coaxially disposed apart from the outer side of the support metal fitting and extends radially outward at one axial end;
A disc-shaped damping plate that is fixed to the other end of the support fitting and disposed with a gap between the other end of the outer fitting;
While being vulcanized and formed between the outer metal fitting and the support metal fitting to connect the two metal fittings, the annular space portion is in close contact with the outer peripheral side of the attenuation plate and radially inwardly between the attenuation plate. A cylindrical rubber elastic body provided with a vent hole that communicates the space portion with the outside in at least one place in the circumferential direction at a portion in close contact with the damping plate;
An intermediate component comprising a thin rubber layer provided on an outer peripheral surface of the outer metal fitting, and an outer rubber seal portion provided with a groove portion in a portion communicating with the vent hole and extending from the vent hole to an axially intermediate position. When,
A bottomed cylindrical metal container having an inner diameter smaller than the outer diameter of the outer rubber seal portion, having a second flange portion extending radially outward at the opening end, and an axially intermediate position of the side wall of the tube portion A liquid-filled vibration isolator comprising a container fitting provided with an air vent hole,
In the container fitting in which a predetermined amount of liquid adjusted in advance is stored, the intermediate component is coaxial from the attenuation plate side, and the vent hole and the air vent hole are aligned in the axial direction. The first flange portion is press-fitted until it abuts on the second flange portion, the intermediate component and the container fitting are fixed in a liquid-tight manner via the outer rubber seal portion, and then the air vent hole is sealed. A liquid-filled vibration isolator characterized by comprising:

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