JPH0454099B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a fluid-filled cylindrical mount device for a cylindrical engine for a front-wheel drive vehicle, etc.
The present invention relates to a fluid-filled cylindrical mount device in which a change in the volume of a pressure receiving chamber is allowed by a change in volume of an equilibrium chamber.

(Prior Art) A cylindrical mount device such as a cylindrical engine mount for a front-wheel drive vehicle is generally required to exhibit a good damping effect against input vibrations in a low frequency range. Therefore, in recent years, such a fluid-filled cylindrical mount device has been developed to include (a) an inner cylinder member, (b) an outer cylinder member disposed outside the inner cylinder member, and (c) a combination of the inner cylinder member and the outer cylinder. (d) a rubber elastic body interposed between the inner cylinder member and the outer cylinder member to elastically connect them; (e) a pressure receiving chamber partially defined by the rubber elastic body, in which fluid pressure fluctuations are caused by input vibration; (f) an equilibrium chamber partially defined by a predetermined flexible membrane, which is communicated with the pressure receiving chamber through a predetermined throttle passage and allows fluid pressure fluctuations in the pressure receiving chamber; (g) A so-called fluid-filled cylindrical mounting device has been proposed, which includes a predetermined incompressible fluid sealed in each of the pressure receiving chamber and the equilibrium chamber.

According to the fluid-filled cylindrical mount device having such a structure, when vibration in the radial direction of the mount is input between the inner cylinder member and the outer cylinder member, a fluid pressure difference is caused between the pressure receiving chamber and the equilibrium chamber. Therefore, the incompressible fluids enclosed in the pressure receiving chamber and the equilibrium chamber are made to mutually flow through the throttle passage,
Therefore, input vibrations in a frequency range set (tuned) for the throttle passage can be effectively damped based on the liquid column resonance effect of the incompressible fluid flowing through the throttle passage. Therefore, by setting the tuning frequency of the throttle passage to a low frequency, it is possible to exhibit a good damping effect on input vibrations in a low frequency range corresponding to the tuning frequency.

(Problem) By the way, in this type of fluid-filled cylindrical mount device, in order to enhance the vibration damping effect based on the liquid column resonance of the incompressible fluid flowing through the throttle passage, it is necessary to It is desirable to allow a large amount of incompressible fluid to flow, but in this type of conventional fluid-filled cylindrical mount device, the rubber elastic partition wall in the mount axis direction of the pressure receiving chamber is connected to the mount axis. It is easy to deform outward in the axial direction (expansion deformation), and fluid pressure fluctuations in the pressure receiving chamber are easily absorbed by expansion and contraction deformation in the mount axis direction of the rubber elastic partition wall.
There is a problem that the incompressible fluid cannot be effectively flowed through the throttle passage, and therefore,
There was a problem in that the vibration damping effect based on the liquid column resonance effect of the incompressible fluid flowing through the throttle passage could not be sufficiently effectively exhibited.

(Solution Means) The present invention has been made in view of the above circumstances, and its gist is as described above: (a) an inner cylinder member; (b) an outer cylinder member; c) A fluid-filled cylindrical mount device comprising: a rubber elastic body; (d) a cavity; (e) a pressure receiving chamber; (f) an equilibrium chamber; and (g) an incompressible fluid. A flexible membrane is integrally molded with the rubber elastic body so as to be located within the through-hole so that the equilibrium chamber is formed within the through-hole and are opposed to each other at a predetermined distance. A substantially rectangular annular structure comprising a pair of substantially arc-shaped or substantially arch-shaped restraining parts and a pair of linear connecting parts extending in the mount axis direction and connecting the corresponding ends of the pair of restraint parts. the restraining member in a state in which the pair of restraint parts sandwich the mount radial intermediate part of the pressure receiving chamber in the mount axial direction, and in a state in which the pair of connecting parts sandwich the pressure receiving chamber in the mount circumferential direction; A pair of restraining portions of the restraining member is arranged so as to be integrally fixed to the rubber elastic body, and prevents deformation of the rubber elastic body partition wall portion of the pressure receiving chamber in the mount axis direction outward in the mount axis direction. This is due to the fact that it has been regulated accordingly.

(Operations/Effects) According to the fluid-filled cylindrical mount device according to the present invention, the substantially rectangular annular restraining member prevents the outward deformation of the rubber elastic partition wall portion of the pressure receiving chamber in the mount axis direction. Since it can be regulated by the restraining part of the rubber elastic body, it is possible to effectively prevent the expansion and contraction deformation of the rubber elastic partition wall part in the mount axis direction. It can be effectively changed depending on the situation. Therefore, the incompressible fluid can be effectively caused to flow through the throttle passage, and the vibration damping effect based on the liquid column resonance of the incompressible fluid flowing through the throttle passage can be sufficiently effectively suppressed. This makes it possible to make the most of it.

In addition, since the flexible membrane that defines the equilibrium chamber is located within the through-hole and is integrally formed with the rubber elastic body, the equilibrium chamber can be formed without using any special members. Therefore, the mounting structure can be made simpler, the productivity can be increased, and it can be manufactured economically.

(Examples) Hereinafter, in order to clarify the present invention more specifically, some examples thereof will be described in detail based on the drawings. Here, we will describe the case where the present invention is applied to a cylindrical mount for a front-wheel drive vehicle; however, the present invention is not limited to this, and it goes without saying that it can be applied to mounting devices other than such cylindrical engine mounts. It is.

First of all, FIGS. 1 to 3 show the structure according to the present invention.
An example of a cylindrical engine mount for FF vehicles is shown. In those figures, 10 and 12
are respectively an inner cylindrical metal fitting as an inner cylindrical member and an outer cylindrical metal fitting as an outer cylindrical member, which are arranged eccentrically by a predetermined amount in the radial direction of the mount, and a substantially semi-cylindrical shape interposed between them. They are elastically connected by a rubber elastic body 14. The engine mount of this embodiment is attached to the vehicle body side or the power unit including the engine at the inner tube fitting 10, and is attached to the power unit side or the vehicle body side at the outer tube fitting 12, so that the power unit is attached to the vehicle body. It is designed to provide anti-vibration support.

Note that the rubber elastic body 14 is interposed between the inner and outer cylinder fittings 10 and 12 on the side where the distance between them in the eccentric direction is larger, and the rubber elastic body 14 is interposed between the two metal fittings 10 and 12. A space 16 having a substantially arcuate cross section is formed on the side where the eccentric distance between the two is smaller, penetrating in the mount axis direction. Further, when the rubber elastic body 14 is attached to the power unit, it is compressed between the inner cylinder fitting 10 and the outer cylinder fitting 12 in their eccentric direction, so that when the power unit is installed, In this case, the inner cylindrical metal fitting 10 and the outer cylindrical metal fitting 12 are positioned substantially concentrically.

Here, the rubber elastic body 14 is
It is integrally vulcanized and bonded to 0. Further, a substantially cylindrical sealing sleeve 18 is integrally vulcanized and bonded to the outer peripheral surface of the rubber elastic body 14 so as to enclose the space 16 . The outer cylindrical metal fitting 12 is fitted onto the seal sleeve 18 in a fluid-tight manner.

Note that the rubber elastic body 14 is integrally molded with a rubber layer 20 of a predetermined thickness that extends around the cavity 16 side, as shown in the figure. Also, in the figure, 52
is a sealing rubber layer integrally vulcanized and formed on the inner circumferential surface of the outer cylindrical fitting 12 in order to ensure fluid tightness with the sealing sleeve 18.

The seal sleeve 18 vulcanized and bonded to the outer peripheral surface of the rubber elastic body 14 includes both the metal fittings 10 and 12.
A window 22 facing the rubber elastic body 14 and a window 24 facing the void 16 are formed so as to face each other in the eccentric direction. A pocket portion 26 having a predetermined depth is formed in the rubber elastic body 14 with the window portion 22 serving as an opening. Further, a bag-shaped rubber elastic membrane 28 as a flexible membrane integrally molded with the rubber elastic body 14 is integrally vulcanized and bonded to the seal sleeve 18 so as to close the window portion 24 from the inside. As a result, a recess 30 is formed with the window 24 serving as an opening. Then, the windows 22 and 24 of the seal sleeve 18 are fluid-tightly closed by the outer cylindrical fitting 12.
A pressure receiving chamber 32 and an equilibrium chamber 34 whose pocket portions 26 and recesses 30 serve as fluid storage spaces, respectively.
A predetermined incompressible fluid such as water, polyalkylene glycol, silicone oil, etc. is sealed in the pressure receiving chamber 32 and the equilibrium chamber 34.

A pair of circumferential grooves 36 are provided in the axially central portion of the seal sleeve 18 and open to the outer circumferential surface in such a manner that the corresponding circumferential ends of the windows 22 and 24 communicate with each other. 36 are formed. A cylindrical throttle passage forming member 40 having a circumferential U-shaped groove 38 on its outer circumferential surface is disposed with a part of the circumferential direction fluid-tightly accommodated in the pair of grooves 36, 36. The opening of the U-shaped groove 38 of the throttle passage forming member 40 is fluid-tightly closed by the outer cylindrical fitting 12, thereby forming a throttle that uses the space inside the U-shaped groove 38 as a fluid passage. A passage 42 is formed.

That is, when a fluid pressure difference is induced between the pressure receiving chamber 32 and the equilibrium chamber 34 due to the relative displacement in the radial direction of the mount between the inner cylinder fitting 10 and the outer cylinder fitting 12, the pressure difference in the pressure receiving chamber 32 and the equilibrium chamber 34 increases. The incompressible fluids are made to flow into each other through the throttle passages 42.
Based on the liquid column resonance effect of the incompressible fluid flowing through the throttle passage 2, input vibrations in a frequency range set for the throttle passage 42 are effectively damped.

Note that the throttle passage 42 is tuned to a low frequency here, and as a result, based on the liquid column resonance effect of the incompressible fluid flowing through the throttle passage 42, low frequency ranges such as engine shake can be prevented. Vibrations are effectively damped.

The throttle passage forming member 40 is made up of a pair of semi-cylindrical throttle passage forming fittings 44, 46, and the throttle passage 42 is formed through holes 48, 50 formed in the narrowing passage forming fittings 44, 46. The pressure-receiving chamber 32 and the equilibrium chamber 34 are communicated through the pressure-receiving chamber 32 and the equilibrium chamber 34, respectively.

By the way, as shown in FIGS. 1 to 3, the inner tube fitting 10 and the outer tube fitting 1 are located on the outer peripheral surface of the inner tube fitting 10 at the center in the axial direction.
A thick-walled annular stopper block 54 is fitted therein for regulating relative displacement of a certain amount or more in the eccentric direction with respect to the first and second parts. This stopper block 54 is
A trapezoidal stopper part 58 is located on one side of the opposing parts with the inner hole 56 in between, and a rectangular stopper part 60 is located on the other side. The inner cylindrical metal fitting is placed in a state in which the extending direction thereof coincides with the eccentric direction of the two metal fittings 10 and 12, and in a state in which the stopper portion 58 projects into the cavity 16 and the stopper portion 60 projects into the pressure receiving chamber 32. It is located at 10. Then, with respect to the distal end surface of the stopper part 60 projected into the pressure receiving chamber 32 of the stopper block 54, the first stopper part 60 is projected laterally by a predetermined distance from each side surface of the stopper part 60.
As shown in phantom lines in the figure, a stopper plate 64 is provided that forms an annular narrowed portion 62 with the inner wall of the pressure receiving chamber 32 .

When the inner cylindrical fitting 10 and the outer cylindrical fitting 12 move relative to each other in their eccentric directions, the incompressible fluid within the pressure receiving chamber 32 passes through the narrowed portion 62 between the stopper plate 64 and the inner wall of the pressure receiving chamber 32 and moves between the two fittings. 10 and 12, and based on the liquid column resonance effect of the incompressible fluid flowing through the narrowed portion 62, the narrowed portion 62
Input vibrations in the frequency range set (tuned) can be effectively blocked.

Note that the narrowed portion 62 is similar to the narrowed passage 42.
Similarly, based on the settings of the length in the flow direction of the incompressible fluid (here, the thickness of the stopper plate 64) and the cross-sectional area (the cross-sectional area in the direction perpendicular to the eccentric direction of both metal fittings 10 and 12). Here, the tuning frequency is set to a relatively high frequency, so that the narrowing portion 62
Input vibrations in a relatively high frequency range, such as muffled sounds, can be effectively blocked based on the liquid column resonance effect of the incompressible fluid flowing through.

In addition, the stopper plate 64 has a structure in which a buffer rubber layer 68 of a predetermined thickness is integrally vulcanized with a metal reinforcing plate 66, and the stopper plate 64 is fixed to the stopper plate by a mounting screw 70. It is fixed at 54.

Further, as is clear from FIGS. 1 and 2, the surface of the stopper portion 58 is covered with the rubber layer 20.

In this embodiment, in a cylindrical engine mount having such a structure, FIGS.
As shown in the figure, a substantially rectangular annular restraint fitting 72 as a restraining member is disposed on the rubber elastic body 14 so as to surround the approximately central portion of the pressure receiving chamber 32 in the radial direction of the mount. This effectively restricts the outward deformation (bulging deformation) of the rubber elastic partition wall portions 74, 74 in the mount axis direction of the pressure receiving chamber 32 in the mount axis direction.

More specifically, as shown in FIG. 4, the restraint fitting 72 includes a pair of arc-shaped restraint parts 76, 76 that face each other with a predetermined distance apart, and a pair of restraint parts 76, 76 that are opposite to each other. It consists of a pair of linear connecting parts 78, 78 that connect corresponding end parts, and here has a structure in which a rectangular annular flat metal fitting is curved into an arc shape. In this embodiment, as shown in FIGS. 1 and 2, the pair of restraining portions 76, 76 are mounted at substantially central portions in the radial direction of the mounts of the rubber elastic partition wall portions 74, 74. The pair of connecting portions 78, 78 are integrally vulcanized and bonded to the outer portion in the axial direction.
The restraint fitting 72 is integrally embedded in the vicinity of the pressure receiving chamber 32 at the approximate center in the radial direction of the mount of the rubber elastic body partition wall portions 80, 80 in the mount circumferential direction of the pressure receiving chamber 32.
4, thereby connecting the connecting portions 78,
The restraint parts 76, 7 of the restraint fitting 72 connected by 78
6 restricts the deformation of the rubber elastic partition wall portions 74, 74 outward in the mount axis direction of the pressure receiving chamber 32 in the mount axis direction.

According to the cylindrical engine mount having such a structure, the deformation of the rubber elastic partition wall portions 74, 74 in the mount axial direction of the pressure receiving chamber 32 in the mount axial direction outward is prevented by the pair of restraint parts 7 of the restraint fitting 72.
Since it is regulated by 6 and 76, both metal fittings 1
The fluid pressure in the pressure receiving chamber 32 is effectively changed according to the change in the vibration load input between 0 and 12, and therefore the incompressible fluid flows through the throttle passage 42 according to the vibration input. It is effectively made to flow. Therefore, based on the liquid column resonance effect of the incompressible fluid flowing through the throttle passage 42,
It is possible to sufficiently effectively dampen input vibrations in the low frequency range such as those caused by engine shake, and it is possible to exhibit a vibration damping effect that is significantly superior to conventional methods for input vibrations in the low frequency range. be.

Further, in the engine mount having such a structure, the rubber elastic membrane 28 as a flexible membrane is integrally molded with the rubber elastic body 14 so as to be located in the cavity 16 penetrating in the axial direction of the mount. Since the intended equilibrium chamber 34 is formed within the cavity 16, there is no need to separately produce the flexible membrane 28 for forming the equilibrium chamber 34, and the rubber elastic body 14 and It can be molded at the same time, which makes the mounting structure simpler, and the work of forming the equilibrium chamber 34 is more productive.
This made it possible to do so in an economically advantageous manner.

Furthermore, according to the engine mount of this embodiment, for the same reason as mentioned above, the stopper plate 6
4 and the inner wall of the pressure-receiving chamber 32, the flow rate of the incompressible fluid that flows into the narrowed portion 62 between the pressure receiving chamber 32 and the inner wall of the pressure-receiving chamber 32 increases significantly compared to the case where the restraint fitting 72 is not provided. The vibration isolation effect based on the liquid column resonance effect of the incompressible fluid is also greatly improved. Furthermore, for the same reason, the narrowing part 62
The change in the cross-sectional area of the narrowed portion 62 is well suppressed.
There is also an advantage that the tuning frequency of the constriction 62, that is, the liquid column resonance frequency of the incompressible fluid flowing through the constriction 62, is stably maintained at the frequency set at the design stage.

Although typical embodiments of the present invention have been described in detail above, these are literal illustrations, and the present invention
It goes without saying that the present invention is not limited to such specific examples, and can be implemented with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art without departing from the spirit thereof. By the way.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view (-cross-sectional view in FIG. 2) showing an example of a cylindrical engine mount for a FF vehicle according to the present invention, and FIGS. 2 and 3 are respectively - in FIG. 1. They are a sectional view and a - sectional view. FIG. 4 is a perspective view showing a restraint fitting in the engine mount of FIG. 1. 10: Inner tube fitting (inner tube member), 12: Outer tube fitting (outer tube member), 14: Rubber elastic body, 16: Blank space, 1
8: Seal sleeve, 28: Rubber elastic membrane (flexible membrane), 32: Pressure receiving chamber, 34: Equilibrium chamber, 40: Throttle passage forming member, 42: Throttle passage, 54: Stopper block, 62: Constriction part, 64: Stopper plate, 72: Restraint fitting (restraint member), 74: Rubber elastic body partition part (mount axis direction), 76: Restraint part, 78: Connection part, 80: Rubber elastic body partition part (mount circumferential direction) ).

Claims (1)

[Claims] 1. (a) an inner cylinder member, (b) an outer cylinder member disposed outside the inner cylinder member, and (c) an intervening device between the inner cylinder member and the outer cylinder member. (d) a mount axis formed between the inner cylinder member and the outer cylinder member at a portion not connected by the rubber elastic body; a void penetrating in the direction;
(e) a pressure receiving chamber partially defined by the rubber elastic body and in which fluid pressure fluctuations are caused by input vibration; and (f) communicating with the pressure receiving chamber through a predetermined throttle passage. (g) an equilibrium chamber partially defined by a predetermined flexible membrane, which allows fluid pressure fluctuations in the pressure receiving chamber; and a predetermined incompressible fluid,
In the fluid-filled cylindrical mounting device, the flexible membrane is integrally molded with the rubber elastic body so as to be located within the through-hole, and the equilibrium chamber is formed within the through-hole. a pair of substantially arc-shaped or substantially arch-shaped restraint parts facing each other with a predetermined distance apart; and a pair extending in the mount axis direction that connects corresponding ends of the pair of restraint parts. a substantially rectangular annular restraining member consisting of a straight connecting portion, the pair of restraining portions sandwiching the mount radially intermediate portion of the pressure receiving chamber in the mount axis direction, and the pair of connecting portions The pressure receiving chamber is sandwiched in the mount circumferential direction and is integrally fixed to the rubber elastic body, and the rubber elastic body partition portion of the pressure receiving chamber in the mount axis direction is directed outward in the mount axis direction. 1. A fluid-filled cylindrical mount device, characterized in that deformation of the cylindrical mount device is regulated by a pair of restraining portions of the restraining member.