JPH0238115Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a fluid-containing mount, and particularly to an orifice structure thereof.

(Prior Art) In Japanese Patent Application No. 58-134826, the present applicant has proposed that a base member connected to a fixed member and a mounting member connected to a vibration source be connected by a shearing type elastic member, and the elastic member A fluid-filled mount has been disclosed which includes a partition plate having an orifice in the middle of the mount, and a diaphragm that makes the volume of one of upper and lower fluid chambers that communicate with each other through the orifice variable. According to this, damping (damping force) other than during resonance can also be obtained by the movable orifice.

(Problem to be solved by the invention) By the way, it is known that damping can be increased by increasing the resistance when fluid passes through an orifice, but the mount has a structure that generates damping by using resonance of the fluid. Therefore, thin plate 1
It is impossible to increase the damping in the required low frequency range (5 to 15 Hz) with an orifice length of about 100 Hz.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid-filled mount having an orifice with a long path length and high flow resistance to increase damping in the required low frequency range.

(Means for Solving the Problems) Therefore, the present invention combines a base member connected to a fixed member and a mounting member connected to a vibration source with an elastic member to form a fluid chamber therein. ,
In a fluid-filled mount that is provided with a partition member that partitions the fluid chamber into upper and lower sections and is formed with an orifice that communicates the upper and lower fluid chambers, the volume of one of the two fluid chambers is variable. A diaphragm is provided on the base member side or the mounting member side, and the partition member is provided in the middle part of the elastic member, and the partition member is floatingly supported with respect to the base member and the mounting member, and at least on the side where the diaphragm is provided. The elastic member of the fluid chamber is formed into an umbrella shape that can be elastically deformed in response to an axial force,
It is characterized in that the partition member is constituted by a cylindrical body having a spiral groove formed on its outer periphery, and a helical orifice formed by the groove is formed between the cylindrical body and the inner periphery of the elastic member.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

The drawing is a central longitudinal cross-sectional view of the fluid-filled mount of the present invention, in which an annular recess is formed at the lower end of a base member 10 in which a mounting flange 12 extending in the outer diameter direction is formed at the upper end of a tapered cylindrical body 11 whose diameter is expanded upward. 14 is bent and formed, the peripheral edge of the disc-shaped bottom plate 15 is inserted into the annular recess 14, the annular recess 14 is caulked, and the bottom of the cylindrical body 11 is closed by tightly joining. Incidentally, the flange 12 is formed with mounting holes 13, 13 facing each other to the fixing member.

On the other hand, an annular recess 22 is bent at the lower end of the base 21 of the mounting member 20, which is composed of an inverted cup-shaped base 21 and a tapered cylindrical body 25 whose diameter is expanded downward. Together with the outer flange 26 formed at the upper end, the peripheral edge of a thin rubber diaphragm 29 that bulges upward in a free state to form a hemispherical shape is inserted, the annular recess 22 is caulked, and the annular recess 22 is tightly joined to form a cylindrical body. 25 and diaphragm 2
9 and assemble. Incidentally, a mounting bolt 23 for attaching the vibration source to the vibration source is provided in the center of the base body 21.

Then, a thin metal sleeve 35 having a large diameter and long vertically is baked on the inner periphery 33 of the intermediate portion of the thick rubber substantially drum-shaped elastic member 30 consisting of the umbrella-shaped lower half 31 and the reverse umbrella-shaped upper half 32. . A cylindrical body 36 made of lightweight synthetic resin or aluminum and having a spiral groove 37 formed along its entire length on the outer periphery is press-fitted into the sleeve 35 and integrally connected.
A spiral orifice 39 is formed between the inner periphery of the sleeve 35 and the cylindrical body 36.

Such a spiral orifice 39 is connected to the inner circumference 33 of the intermediate portion.
The substantially drum-shaped elastic member 30 provided in the upper and lower cylinder bodies 25,
11, and attach the cylindrical body 36 to the base member 1.
0, floating support is provided to the mounting member 20. Thus, below the cylindrical body 36 constituting the partition member, there is a main fluid chamber 41 surrounded by the umbrella-shaped lower half 31 of the elastic member 30 and the bottom plate 15;
A sub-fluid chamber 42 surrounded by an inverted umbrella-shaped upper half 32 and a diaphragm 29 is defined above the diaphragm 6;
Both fluid chambers 41 and 42 are filled and sealed with liquid.

Since the orifice that communicates the upper and lower fluid chambers 41 and 42 is a spiral orifice 39 with a very long path length, the resistance when the liquid passes through the orifice 39 is large, resulting in large damping (damping force). I will do it.

Here, the experimental results show that the loss coefficient (tanδ) when the frequency is 15Hz and the mount displacement is ±0.5mm is:
A simple orifice installed in a conventional partition plate had a value of 0.3, but with the spiral orifice 39, a high value of 1.0 or more could be obtained.

Further, according to the present embodiment, when high frequency and minute amplitude vibrations are input, the diaphragm 29 absorbs pressure fluctuations in the fluid chamber 42 on the diaphragm 29 side, and vibration transmission can be effectively absorbed.

Furthermore, if the diaphragm 29 is placed on the upper mounting member 20 side as in the embodiment, even if air is generated in the mount, air exists in the upper auxiliary fluid chamber 42, so the mount displacement will not be affected by the air. The liquid acts on the lower main fluid chamber 41 without being absorbed, and the liquid passes through the orifice 39 to generate the desired damping.

Of course, the diaphragm may also be provided on the base member side.

(Effects of the invention) As described above, according to the fluid-filled mount of the present invention, the partition member is composed of a cylindrical body with a spiral groove formed on the outer periphery, and a spiral groove is formed between the inner periphery of the elastic member and the cylindrical body. Since the shaped orifice is formed, the damping performance in the required low frequency range can be increased, and the orifice length and diameter can also be tuned.

[Brief explanation of the drawing]

The drawing is a central longitudinal cross-sectional view of the fluid-containing mount. In the drawing, 10 is a base member, 12 is a mounting flange, 15 is a bottom plate, 20 is a mounting member, 23 is a mounting bolt, 29 is a diaphragm, 30 is an elastic member,
35 is a sleeve, 36 is a partition member, 37 is a spiral groove, 39 is an orifice, and 41, 42 are fluid chambers.

Claims (1)

[Scope of utility model registration request] A base member connected to a fixed member and a mounting member connected to a vibration source are combined with an elastic member to form a fluid chamber therein, and the fluid chamber is divided into upper and lower parts. In a fluid-filled mount comprising a partition member in which a communicating orifice is formed, a diaphragm that makes the volume of one of the two fluid chambers variable is provided on the base member side or the mounting member side, and the partition A member is provided at an intermediate portion of the elastic member to floatingly support the partition member with respect to the base member and the mounting member, and at least the elastic member of the fluid chamber on the side where the diaphragm is provided can be elastically deformed in response to an axial force. The partition member is formed into an umbrella shape, and the partition member is formed of a cylindrical body with a spiral groove formed on the outer periphery, and a spiral orifice is formed by the groove between the cylindrical body and the inner periphery of the elastic member. Features a fluid-filled mount.