JPS62215139A - Liquid containing vibration isolating device - Google Patents

Abstract

PURPOSE:To carry out the tuning of a damping force to a loss factor by providing a first orifice pipe and a second orifice pipe between two bag bodies which are filled with liquid and making said liquid flow between said bag bodies in response to vibration. CONSTITUTION:The elastic force of an elastic body 18 is applied to a pressing body 19, and a predetermined pressure is applied to liquid 3 in bag bodies 11, 12. In this condition, if a vertical vibration is applied to a supporting shaft 20, the vibration is applied to the pressing body 19 causing a liquid 3 in the bag body 11 to flow into the bag body 12 through a first orifice pipe 13 or a second orifice pipe 23. Thereupon, the bag body 12 absorbs the vibration while expanding in the range of a space 17. Since the second orifice pipe 23 is larger in length than the first orifice 13, it is possible to change the loss factor of a vibration isolating device by making the fluid 3 pass through the second orifice pipe 23 by means of a switching cock 24.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid-filled vibration isolating device for supporting vibrations caused by road surfaces or engines while a vehicle is running.

BACKGROUND TECHNOLOGY In general, as an anti-aircraft device for a dynamic body, it is common to use an elastic body structure made of rubber or the like between the vibrating body and the support body to provide elastic support. A vibration isolation structure, commonly referred to as a dynamic damper, is known in which a vibrating body is fixed to one end of a damper, and an elastic body sound is interposed between a separately installed solid mass body and the vibrating body. In the above dynamic damper, J:f'L is the natural frequency of one mass body due to the vibration of the vibrating body? Does it maintain vibration, dampen vibrations, and reduce muffled noise in engines, etc.? bring.

On the other hand, various liquid-filled vibration isolators have been developed in recent years and are widely used. The above-mentioned liquid-filled vibration isolator [appropriate for TK dynamic dampers and shown in proportional IJ&4 and Figure 5]. 1 in the figure is a first housing n7'c composed of an upper case la and a lower case 1b, and the side extension support shaft 2
is inserted. A liquid 3 made of ethylene glycol or the like is sealed in the lower case lb, and a bag body 4 made of an elastic material such as rubber is filled, and an orifice pipe 5 is inserted through the lower end of the core bag body 4 into the lower case 1bγπ. It is a meeting.

- 10,000 is the same upper case 6a and lower case 6b as above.
A7 is the 271st using, and the second
A bag body 1 made of an elastic material such as rubber is filled with a liquid 8 sealed inside the housing 6, and the orifice pipe 5 is attached through the upper end of the bag body 7 through an upper case 8akW. That is, the orifice pipe 5 is installed to communicate between the bag body 4 in the first housing 1 and the bag body 7 in the second housing 6, and is set to an appropriate length by the bent portion 5a. Housing 6? It is a connecting pipe that connects. In addition, it is configured as above and the anti-vibration system #? In addition to the dynamic damper, if the damper is used in a vibration-proof connection mechanism between the vibrating body and the support body, the above-mentioned 2). Link.

With such a configuration, the liquid 8 flows between the bags 4 and 7 through the entire orifice pipe 5 to counteract the vibrations applied to the support shaft 2, thereby damping the vibrations caused by the resonance effect. Power? can occur and increase the loss factor.

Problems that the invention attempts to solve However, this method does not solve the problems of conventional liquid-filled vibration isolators.
For example, since the metal bodies constituting the first housing 1 and the second housing 6 and the bags 4 and γ made of elastic bodies such as rubber are bonded using vulcanization adhesive means, the assembly operation must be done carefully. However, the disadvantage is that the manufacturing cost is high. - Since the hardness, that is, the elastic force of the bags 4 and 7 remains constant at the initial setting of 72, the damping force and loss factor? There is a problem in that it is not possible to tune to zero as desired.

Therefore, the present invention solves the problems that conventional liquid-filled vibration isolators have, and simplifies the assembly operation. It is intended for use as a support tray for liquid-filled vibration isolators.

problem? Means liquid to solve? two bags made of an elastic material such as rubber filled, a first orifice pipe provided between the cough bags to allow the liquid to flow between the bags in response to vibration; and the first orifice. The flow of the liquid is branched from the middle part of the pipe so that it can be switched.
C%n communicated with the bag body on one side n-z approximately spiral-shaped second
The orifice tube and the two bags mentioned above? A housing that is housed integrally and has surplus spaces above and below, an NFT support shaft that is inserted into the upper space from the side of the housing, and a bag that is fixed to the support shaft. The bag is configured to include a pressing body that comes into contact with the body, and an elastic member that is housed in the upper space of the housing and applies a pressing force to the pressing body in the direction of the bag body.

A pressing plate fixed to the supporting shaft presses one of the bag bodies by using vibrations transmitted to the supporting shaft inserted into the upper space,
All the valves of the first orifice pipe or the second orifice pipe are opened to allow liquid to flow between the two bags, thereby damping the sluggish motion. At this time, is there a pressing force on the suppression plate toward the bag body? Elastic force of the elastic member applying force? While it is possible to set the attenuation level by positioning the attenuator at a fixed position, it is also possible to tune the loss factor by selecting the position of the first or second orifice.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, various embodiments of a liquid-filled vibration isolator according to the present invention will be explained with reference to all the drawings.

In the first embodiment shown in FIG. 1, 11 and 12 are bags made of an elastic material such as rubber, and a first orifice pipe 18 is connected between them. The inside of the bag 11, 12 is filled with a liquid 8 such as ethylene glycol. 14
1 is a housing that integrally accommodates the bags 11 and 12, the first orifice pipe 18, and an elastic member 18 to be described later, and a neck C portion 1411 is formed approximately in the center of the housing 14. Further, extra spaces 16 and 17 are formed above and below the internal space of the housing 14, respectively, and an elastic member 18 is accommodated in the upper space 16. In the illustrated example, a rubber bag filled with gas at a predetermined pressure is used as the elastic member 18. Reference numeral 19 denotes a pressing body inserted between the bag body 11 and the elastic member 18, and a primary support shaft 20 inserted from the side of the housing 14 is fixed to the pressing body 19. Reference numeral 21 denotes an elongated hole bored on the side wall of the housing 14, and the support shaft 20 is inserted into the elongated hole 21. In other words, within the range of the elongated hole 21 extending in the vertical direction, the support shaft 2
0 is movable in the vertical direction. Further, the elastic force of the elastic member 18 is applied to the pressing body 19 to apply a predetermined pressing force to the bag body 11. Further, a locking portion 22 is provided from the lowest end of the housing 14, and is configured to be connectable to a support or the like.

On the other hand, a spiral second orifice pipe 2 is provided between the bag body 11 and the bag body 12 from the middle part of the 7'C first orifice pipe 18.
8 are all branched and connected, and the second orifice pipe 28
The lower end of? It communicates with the bag body 12. Switch cock to 24?
As shown, the liquid 8 can be switched from the outside of the flow path between the bags 11 and 12. That is, by operating the switching cock 24, the liquid 8 is transferred to the bag body 1 through all valves of either the first orifice pipe 18 or the second orifice pipe.
1. Within 12 minutes? A circulating O is created.

With such a configuration, the elastic force of the elastic member 18 can be applied to the pressing body 1.
9, a predetermined hydraulic pressure is applied to the liquid 8Ic in the bags 11 and 12 in advance. In this state, when external vibration is applied to the support shaft 20 to move the support @20 in the vertical direction,
This vibration is applied to the pressing body 19, and the liquid 8 filled in the bag 11 flows into the bag 12 located below via the first orifice pipe 1B or the second orifice pipe 23. Then, the bag body 12 expands within the range of the space 17 formed below and stops receiving the vibration,
And absorb.

During the above action, since the length of the second orifice pipe 28 is longer than that of the first orifice pipe 1111, the switching cock 24 is operated to switch between 8 vil of liquid and the inside of the second orifice pipe. Orifice length by making it flow? Since it can be changed, it is possible to completely change the loss factor of the vibration isolator. In the experiment J:lf'L first orifice 18
When the liquid 8 is passed through the first orifice 18 with a pipe length of 800 nm/m, the loss factor is 6.0 Hz,
On the other hand, assuming that the pipe length of the second orifice 28 is '5500 m/cn, the liquid 8? When distributed, the loss factor was maximum at 48 Hz.

FIG. 2a Second embodiment of the present invention? In the figure, the same components as in the first embodiment are indicated by the same reference numerals. In the case of this second embodiment, the neck portion 14a' of the housing 14? 25.26? instead of the neck n part 14aK, the support platen is attached to the inner wall of the housing 14). It stuck and the bag body 11°12 was removed @? This is the configuration that prevents this.

Reference numeral 14' represents an upper lid body, and a spring elastic member 18 is conveniently used in place of the elastic member of the bag body. Note that the operation is the same as that of the first embodiment.

Is Fig. 8 the eighth embodiment of the present invention? In the case of this embodiment, the second orifice pipe 2g7 branched from the first orifice pipe 18 protrudes from the outer periphery of the housing 14, and the neck n portion 14a? ! - After winding, the structure is connected again to the bag body 12 inside the housing 14. By modifying the above structure, it is possible to make the second orifice pipe 23 even longer.

In addition, without the neck part 14a't- of the second implementation, the second
The orifice tube 28 may be wound around the outer periphery of the generally flat housing 14. Friend, the bag 11° - the orifice 13.2B - does not need to be connected in a straight line to the bag 12, and may be bent to fit the attachment part.

Effects of the Invention As described above in detail, the liquid-filled vibration isolator according to the present invention includes two bags made of an elastic material such as rubber filled with liquid, and a device provided between the bags to prevent vibrations. a first orifice pipe for causing the liquid to flow between the respective bag bodies according to the configuration; and a first orifice pipe that is switchably branched from a midway part of the first orifice pipe to allow the liquid to flow between the bag bodies on one side. Connected C-shaped spiral second
The orifice pipe and the two bags are housed together, and the excess space 1:tV is provided above and below. a shaft, a pressing body that is fixed to the support shaft and comes into contact with one of the bags, and a pressing body that is stored in the upper space of the housing and applies a full pressing force to the pressing body in the direction of the bag. Since the structure is made of an elastic member, it has the following effects.

That is, there are two bags and a first bag inside the housing. Since the second orifice pipe can be sealed integrally, one assembly is extremely easy, productivity is improved, and manufacturing costs can be reduced. Further power to the above? By appropriately determining the transmission selection, it is possible to set the level of damping of the impression to the desired one shift, and tuning is easy. In addition, as soon as the cock is operated, it is necessary to install the LV bag between the bodies. The advantage is that by connecting some of the second orifice pipes to one side, the entire length of the orifice pipe itself can be changed, making it possible to detune the loss factor, and having a wide range of uses as a vibration isolator. have.

[Brief explanation of drawings]

FIG. 1 is a first embodiment of a liquid-filled anti-photography device according to the present invention.
FIG. 2 is a cross-sectional view of the main part shown in the second embodiment of the present invention, and FIG. 8 is a cross-sectional view of the main part shown in the eighth embodiment of the present invention. FIG. 4 is a cross-sectional view of the main part of an example of a conventional liquid-filled barrier device, and FIG. 5 is an exploded perspective view of the same. 8...Liquid, 11.12...Bag body, 13...First
Orifice pipe, 14...Housing, 16.17...
- Between 9 parts, 18... Elastic member, 19... Pressing body, 2
0...Support shaft, 21...Elongated hole, 28...Second orifice pipe, 24...Switching cock. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) two bags made of an elastic material such as rubber filled with liquid, and a first orifice pipe provided between the bags to allow the liquid to flow between the bags in response to vibration; A substantially spiral second orifice pipe that is branched from the middle of the first orifice pipe so that the flow of the liquid can be switched and communicated with the bag body on either side, and the two bag bodies are integrated. a housing having surplus spaces above and below; a support shaft inserted into the upper space from the side of the housing; and a bag body fixed to the support shaft on the one side. 1. A liquid-filled vibration isolator comprising: a pressing body that comes into contact with the housing; and an elastic member that is housed in an upper space of a housing and applies a pressing force to the pressing body in the direction of the bag body.