JPH06257638A - Liquid-sealed rubber mount - Google Patents

Abstract

PURPOSE:To maintain a vibrationproof liquid-sealed rubber mount in such state as ensuring high vibration isolation characteristics in medium and high frequency bands, freedom from the induction of a resonance with a shock vibration over a wide frequency band, and less rolling. CONSTITUTION:A liquid sealing chamber 20 is fixed to one end of a mount case 11, end a damper plate 22 is housed therein. A guide shaft 14 having a bolt 27 is fastened to the damper plate 22 with a nut 24, and the guide shaft 14 and the case 11 are jointed to each other with a cushion rubber 28 having cylindrical lamination plates 29 clamped inside. The cushion rubber 28 has hardness Hs between 45 and 60 degrees for keeping a small spring constant. Also, high attenuation liquid having viscosity between 50,000 cst and 150,000 cst is sealed in the chamber 20. According to this construction, a spring constant for a vertical vibration becomes small, thereby providing high vibrationproof characteristics in a high frequency band. Also, no resonance is induced with a shock vibration, due to the existence of the high attenuation liquid. In addition, the cushion rubber 28 has a cylindrical and laminated form. Thus, a spring constant in a horizontal direction becomes large, thereby enabling rolling to be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-proof liquid-filled rubber mount, and more particularly to a liquid-filled rubber mount for vibration-proof mounting of a driver's cab of an industrial vehicle or the like on a vehicle body.

[0002]

2. Description of the Related Art FIG. 1 shows the overall structure of a cab mount for a dump truck. Brackets 3 and 4 fixed to a frame 2 of the dump truck 1 are provided with a vibration proof mount 10.
The floor 6 of the cab 5 is mounted via the cab 5 to prevent the vibration from the road surface or the like from being directly transmitted to the cab 5.

FIG. 2 is a detailed view of a portion A in FIG. 1. A case 11 of a vibration proof mount 10 is fastened to a bracket 4 with bolts 12 and nuts 13. Anti-vibration mount 1
The guide shaft 14 of No. 0 is fastened to the floor 6 by a nut 15 to mount the cab 5 on a vibration-proof.

As a conventional liquid-filled mount, a liquid-filled mount 50 shown in a side sectional view of FIG. 9 and FIG.
The viscous mount 60 shown in the side sectional view of FIG.

In the liquid mount 50 shown in FIG. 9, the case 51 and the boss 53 having the bolt 52 are connected by a cushion rubber 54. A rubber diaphragm 55 having an orifice 56 therein is attached to the tip of the boss 53, and the periphery of the diaphragm 55 is fixed to the case 51.

The diaphragm 55 divides the case 51 into an A chamber 57 and a B chamber 58. A liquid is sealed in the A chamber 57 and the B chamber 58, and both chambers communicate with each other through an orifice 56.

When a load is applied in the vertical direction, the case 51 and the boss 53 are relatively displaced while deforming the cushion rubber 54. At that time, the liquid passes through the orifice 56 and the chamber A 5
7 and the B chamber 58, and the vibration is damped by the resistance force when passing through the orifice 56.

In the viscous mount 60 shown in FIG. 10, a liquid sealing chamber 62 is fixed to one end of a case 61, and a damper plate 63 having a stopper rubber 64 is housed therein.

A guide shaft 65 having a bolt 66 is fastened to the damper plate 63 by a bolt 67. The guide shaft 65 and the case 61 have a hardness H _S 7
It is joined by a cushion rubber 68 of about 0 °.

The liquid enclosure 62 has a viscosity of 50,000 to 1
A high damping liquid of about 00000 cst is enclosed, and when a load is applied in the vertical direction, the damper plate 63 agitates the damping liquid and damps the vibration by the damping force generated at that time.

[0011]

The damping characteristics of the liquid-filled mount depend on the orifice diameter and the flow rate through the orifice. FIG. 11 is a graph showing the damping characteristic with the input amplitude of the liquid-filled mount as a parameter, where the horizontal axis is the frequency,
The vertical axis is the damping coefficient.

As can be seen from FIG. 11, a large vibration damping effect can be obtained at a specific frequency, but vibration is induced and vibration is generated for input vibration in a wide frequency band such as shock vibration. Further, there is a problem that lateral damping is not obtained and lateral vibration occurs.

FIG. 12 is a graph showing the loss factors of the liquid-filled mount and the viscous mount, where the horizontal axis is the frequency and the vertical axis is the loss factor. As is clear from the figure, the loss factor of the viscous mount is larger in the wider frequency band than the liquid-filled mount, and resonance is not induced even when shock vibration is applied, but it is necessary for low vibration and noise reduction. Among them, there is a problem that the vibration damping effect is large due to large attenuation even in the high frequency range.

As a countermeasure against this, if the hardness of the mount rubber is reduced and the spring constant is reduced to improve the vibration damping effect in the middle and high frequency ranges, the deflection against the lateral load becomes large, and the rolling occurs. There's a problem.

Further, the viscous mount structurally has a problem that lateral damping occurs due to poor lateral damping.

FIG. 13 is a side sectional view of the viscous mount 60, and FIG. 14 is a view taken in the direction of arrows D--D in FIG. As shown in the figure, both the liquid sealing chamber 62 and the damper plate 63 are circular.

A large damping force can be obtained because the damping force acts on the area of the diameter d of the damper plate 63 with respect to the vertical displacement, but the thickness of the stopper rubber 64 with respect to the lateral displacement. The damping force acts only on the projected area of b, and when the damper plate 63 is displaced to the dotted line position as shown in FIG. 14, the liquid is smoothed from the E portion to the F portion along the circumference as indicated by the arrow. Since it moves to, almost no damping force can be obtained.

The present invention has been made by paying attention to the above-mentioned problems, and exhibits an excellent vibration damping effect in a high frequency range among the requirements for low vibration and noise reduction, and when driving on a bad road. It is an object of the present invention to provide a liquid-filled rubber mount that does not resonate against shock vibrations in a wide frequency band and that causes less rolling.

[0019]

[Means for Solving the Problems] To achieve the above object,
The first invention of the liquid-filled rubber mount according to the present invention is
One member and the other member, which are independent of each other, are connected via a cylindrical mounting rubber, and the damping liquid and the other member are fixed to the liquid sealing chamber fixed to the one member. In a liquid-filled type vibration damping mount including a damper plate, the cylindrical mounting rubber is provided with a cylindrical plate which is sandwiched inside to form a laminated shape. In the first invention, the hardness of the cylindrical mounting rubber is H.
It is characterized by exceeding _S 45 ° and H _S 60 ° or less. In the third invention, in the first or second invention, the damping liquid to be sealed in the liquid sealing chamber has a viscosity of 5 or less.
It is characterized in that it exceeds 0000 cst and is less than or equal to 150000 cst. In the fourth invention, one independent member and the other independent member are connected via a cylindrical mounting rubber, and the one member In a liquid-filled type vibration-proof mount in which a damping liquid and a damper plate fixed to the other member are contained in a liquid-filled chamber fixedly attached to the liquid-filled chamber, the polygonal damper plate is built-in in the liquid-filled chamber. Is characterized by.

[0020]

According to the first, second and third aspects of the invention, since the laminated cylindrical plates are provided inside, the spring constant in the horizontal direction is increased and the rolling is reduced. Further, by setting the hardness of the cylindrical mount rubber of the liquid-filled rubber mount to H _S 45 ° to 60 °, the spring constant in the vertical direction is small, and the vibration damping property in the middle and high frequency regions is improved. Further, since the viscosity of the damping liquid is set to 50,000 to 150,000 cst, high damping property is exhibited in a wide frequency band.

According to the fourth aspect of the invention, since the damper plate contained in the liquid sealing chamber in which the damping liquid is sealed is formed in a polygonal shape, a high damping force is exerted against displacement in a direction perpendicular to each side of the polygonal shape. And reduce rolling.

[0022]

Embodiments of the liquid-filled rubber mount according to the present invention will be described in detail below with reference to the drawings. 3 is a side sectional view of a first embodiment of the liquid-filled rubber mount according to claims 1 and 2, and FIG. 4 is a plan view seen from B of FIG.

A liquid sealing chamber 20 having a stopper plate 21 at the tip of the case 11 of the liquid sealing rubber mount 10.
Is stuck. A rubber stopper 2 is provided in the liquid filling chamber 20.
3 and a damper plate 22 having a hole 26 are housed therein, and a gap 25 is provided between the periphery of the damper plate 22 and the liquid filling chamber.

A guide shaft 14 having a bolt 27 is fastened to the damper plate 22 by a nut 24. The guide shaft 14 and the case 11 are connected by a cushion rubber 28 in which a cylindrical laminated plate 29 is sandwiched. The hardness of the cushion rubber 28 is H _S 45 ° ~
It is 60 °.

A high-viscosity damping liquid having a viscosity of 50,000 to 150,000 cst, such as a silicon liquid, is enclosed in the liquid sealing chamber 20.

When the vehicle starts traveling, the case 11 and the guide shaft 14 are displaced relative to each other due to vibrations from the road surface, etc. However, since the hardness of the cushion rubber 28 is lowered, the spring constant in the vertical direction becomes small, and the medium and high frequency ranges are reduced. Anti-vibration against the vibration of.

Further, as shown in FIG. 4, since the cushion rubber 28 is formed into a cylindrical laminated shape by the laminated plate 29,
The spring constant in the horizontal direction is increased to reduce the occurrence of roll of the cab.

When the case 11 and the guide shaft 14 are displaced relative to each other in the vertical direction, the damper plate 22 vertically stirs in the liquid sealing chamber 20, and the stirred high-viscosity damping liquid passes through the gap 25 and the hole 26. As it moves, a large damping force is generated.

Therefore, a damping force higher than that of the conventional Viscos mount is exerted in a wide frequency band, and resonance is not induced even for input vibration in a wide frequency band such as impact vibration.

FIGS. 5 and 6 are graphs showing the effect. FIG. 5 shows the vertical vibration transmissibility, the vertical axis represents the vertical vibration transmissibility, and the horizontal axis represents the frequency. In the graph, the thick solid line indicates the liquid-filled rubber mount of the present invention, and the thin solid line indicates the conventional viscous mount.

FIG. 6 shows the horizontal vibration transmissibility, the vertical axis is the horizontal vibration transmissibility, and the horizontal axis is the frequency. In the graph,
The thick solid line shows the liquid-filled rubber mount of the present invention, and the thin solid line shows the conventional viscous mount.

In any case, compared to the conventional viscous mount, the vibration transmissibility of the liquid-filled rubber mount of the present invention is lowered over the entire frequency range, which shows the effect of vibration damping and roll reduction. .

FIG. 7 is a side sectional view of a second embodiment of the liquid-filled rubber mount according to claim 3, and FIG. 8 is a sectional view taken along line C- of FIG.
It is C sectional drawing. Liquid sealed rubber mount case 3
A quadrangular liquid-filled chamber 32 having a stopper 33 is fixed to the tip of 1.

A quadrangular outer damper plate 40 having a stopper rubber 41 is accommodated in the liquid sealing chamber 32 with each side corresponding. The width of one side of the outer damper plate 40 is W, and the height thereof is H. A gap 42 is provided between the outer damper plate 40 and the liquid filling chamber 32. Further, the outer damper plate 40 is fastened to the guide shaft 34 having the bolt 35 by a nut 44.

Inside the outer damper plate 40, a quadrangular inner damper plate 43 is arranged with its sides inclined by 45 °, and is fixed to the bottom of the liquid sealing chamber 32.

The guide shaft 34 and the case 31 are connected by a cushion rubber 36.

With respect to the vibration in the vertical direction, since the outer damper plate 40 has a downward U-shape, the damping force in the direction in which the damping liquid is confined becomes larger than that of the conventional one.

With respect to the displacement in the horizontal direction, the outer damper plate 40 is a quadrangle and is a plane having one side having an area of W × H, and is parallel to the wall of the liquid sealing chamber 32. A damping force is generated to prevent rolling.

Since the inner damper plate 43 is inclined 45 ° with respect to the outer damper plate 40, a damping force in the P direction of FIG. 8 can be obtained.

The inner damper plate may be provided as needed, and the shape of the damper plate may be a polygon other than a quadrangle.

[0041]

As described in detail above, in the liquid-filled rubber mount of the first invention, the hardness of the cylindrical mount rubber of the liquid-filled rubber mount for the purpose of vibration isolation is set to H _S 4
The viscosity of the damping liquid to be encapsulated is 5000
A high-viscosity damping liquid of 0 to 150,000 cst was used.

Therefore, the spring constant in the vertical direction becomes small, and the vibration resistance in the middle and high frequency regions required for preventing vibration and noise is excellent.

Moreover, a high damping property is obtained in a wide frequency range, and resonance is not induced even for input vibration in a wide frequency band such as impact vibration.

Further, since the mounting rubber is laminated, the spring constant in the horizontal direction becomes large, and it is possible to prevent the rolling.

In the liquid-filled rubber mount of the second invention, since the damper plate built in the liquid-filled chamber has a polygonal shape, a large damping force is generated against horizontal vibration to prevent lateral vibration. You can

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a cab mount of a dump truck.

FIG. 2 is a detailed view of a portion A in FIG. 1, and is a detailed view of mounting a mount.

FIG. 3 is a side sectional view of the first embodiment of the liquid-filled rubber mount according to the present invention.

FIG. 4 is a plan view of the first embodiment of the liquid-filled rubber mount according to the present invention.

FIG. 5 is a graph of vertical vibration transmissibility of the rubber mount according to the first embodiment.

FIG. 6 is a graph of horizontal vibration transmissibility of the rubber mount according to the first embodiment.

FIG. 7 is a side sectional view of a second embodiment of the liquid-filled rubber mount according to the present invention.

FIG. 8 is a bottom sectional view of a second embodiment of the liquid-filled rubber mount according to the present invention.

FIG. 9 is a side sectional view of a conventional liquid-filled mount.

FIG. 10 is a side sectional view of a conventional viscous mount.

FIG. 11 is a damping characteristic curve of a conventional liquid-filled mount.

FIG. 12 is a loss factor curve of a conventional liquid-filled mount and a viscous mount.

FIG. 13 is a side sectional view of a conventional viscous mount.

FIG. 14 is a bottom sectional view of a conventional viscous mount.

[Explanation of symbols]

10, 30 Liquid filled rubber mount 40 Outer damper plate 11, 31 Case 43 Inner damper plate 14, 34 Guide shaft 20, 32 Liquid filled chamber 22 Damper plate 28, 36 Cushion rubber 29 Laminated plate

Claims (4)

[Claims] 1. An independent member and another member are connected to each other via a cylindrical mounting rubber, and a damping liquid and the other member are provided in a liquid sealing chamber fixed to the one member. A liquid-filled type vibration damping mount including a damper plate fixed to a member, characterized in that the cylindrical mounting rubber comprises a cylindrical plate that is sandwiched inside to form a laminated shape. Liquid filled rubber mount. 2. The liquid-filled rubber mount according to claim 1, wherein the cylindrical mounting rubber has a hardness of more than H _s 45 ° and not more than H _s 60 °. 3. The liquid-filled rubber mount according to claim 1, wherein the damping liquid to be filled in the liquid filling chamber has a viscosity of more than 50,000 cst and not more than 150,000 cst. 4. One independent member and the other member, which are independent of each other, are connected via a cylindrical mounting rubber, and a damping liquid and a damper plate are opposed to a liquid sealing chamber fixed to the one member. In a liquid-filled type vibration-proof mount having a built-in resistance plate and a damper plate fixed to the other member, a liquid-filled rubber mount, wherein the polygonal damper plate is built in the liquid filled chamber.