JPS61286632A - Liquid filled type mount rubber - Google Patents

Abstract

PURPOSE:To enable the increase in the passage resistance in an orifice even in the case of a small size by arranging a weight substituting for the mass of liquid in the orifice in a resonant orifice arranged on a division wall which divides a fluid chamber into two parts. CONSTITUTION:On a division wall 7 which divides a void chamber 6 being a fluid chamber into two parts, a cylindrical resonant orifice 8 which communicates both chambers is provided, and a weight 9 consisting of metal and the like whose mass is larger than that of filled liquid is housed in it so as to be freely movable in the axial direction of the cylinder. And in a specific vibration frequency band, the liquid and weight 9 in the interior of resonant orifice 8 resonates integratedly to perform a damping action.

Description

DETAILED DESCRIPTION OF THE INVENTION A1.Objective of the invention [Industrial application field] The present invention is directed to the installation of an engine, suspension frame, etc. to the body of an automobile. This relates to a mount rubber that is filled with water (generally water mixed with antifreeze).

[Conventional technology]

A liquid-filled type mount rubber provided with a resonance orifice is known as a mount rubber for mounting an engine. Its structure is such that a rubber block that absorbs high-frequency vibrations well is attached with an expandable and deflated liquid chamber divided into two by a partition wall, and an orifice with a long effective length is provided in the partition wall to communicate the two chambers.

This mount rubber has a damping effect due to the resonance of the liquid generated inside the orifice due to the resonance of the mass of the liquid inside the orifice and the stiffness of the diaphragm in the direction of swelling due to the liquid pressure as a spring. It has the advantage of improving the damping effect in a specific vibration frequency band (in the case of engine mounts, usually matched to the natural frequency of the engine mount system) determined by the length and effective area.

[Problem that the invention seeks to solve]

In the conventional liquid-filled mount rubber with a resonant orifice, it is necessary to appropriately set the orifice length and orifice area to ensure a sufficient mass of the liquid within the orifice.

The above requirements can be easily met with a sufficiently large mount rubber and a good effect can be obtained, but the effect is weak with a small mount rubber.

When the mount rubber is made smaller, the resonant mass of the liquid within the orifice is kept at a constant value, and in order to make the resonance frequency the same as a large mount rubber, a narrower orifice area and a longer orifice length are required. This is because the flow path resistance within the orifice increases and the liquid does not resonate smoothly within the orifice.

In view of the above-mentioned problems that conventional liquid-filled mount rubbers with resonant orifices have when miniaturized, the present invention aims to reduce the mass of the liquid in the orifice, which is difficult to secure due to miniaturization, by partially using other mass elements. The purpose of the present invention is to provide a mount rubber that secures sufficient mass and exhibits a good damping effect by replacing the mount rubber.

Summary: Structure of the Invention [Means for Solving the Problems] In order to achieve the above object, the present invention has the following structure. That is, the liquid-filled mount rubber according to the present invention is a liquid-filled mount rubber in which a liquid chamber divided into two by a partition wall is communicated with each other by a resonance orifice provided in the partition wall.

A weight made of a material having a mass greater than the enclosed liquid is housed within the resonant orifice so as to be movable in the direction of the flow path.

[For production]

When vibration acts on the mount rubber of the present invention and the pulsating pressure of the enclosed liquid rises, and reaches a specific vibration frequency band, the liquid inside the orifice and the weight resonate together, producing a damping effect. .

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

1st embodiment (see Fig. 1) A conical rubber block 4 with a mounting port 3 embedded in the top is fixed to one end of a short cylinder 2 with a mounting seat l protruding from the periphery. It constitutes a swinging rubber.

A rubber diaphragm 5 is stretched over the other end of the short cylinder 2 to form a cavity 6 between it and the rubber block 4, and a partition wall 7 provided at the center of the short cylinder 2 separates the cavity 6 from the rubber block 4 side to the diaphragm 5. It is divided into two rooms on the side. The empty chamber 6 is filled with water containing antifreeze.

A cylindrical resonance orifice 8 is provided in the center of the partition wall 7 to communicate the two chambers, and a weight 9 made of metal, hard synthetic resin, or other material whose mass is larger than the sealed liquid is provided in the center of the partition wall 7.
is housed so as to be freely movable in the axial direction of the cylinder.

The effective area and effective length of the resonant orifice 8 and the weight of the weight 9 are set in accordance with the target vibration frequency range in which the damping action is to be performed.

Stoppers 10- are provided on the inner peripheral surface of both ends of the orifice 8 to prevent the weight 9 from escaping from the orifice 8 due to excessive hydraulic pressure.
There are 10. Reference numeral 11-11 denotes a balance spring for placing the weight 9 in a neutral position within the orifice 8, and a compression coil spring having a spring constant small enough not to interfere with the resonance action of the weight 9 is used.

The stopper 10 also serves as a spring receiver.

Second Embodiment (See Figures 2 and 3) Instead of the cylindrical resonant orifice 8 of the first embodiment, the second embodiment has a resonant orifice 8 within the wall thickness of the partition wall 7 along its surface direction. It is provided in an arcuate tunnel shape, and one opening 8A of the
is opened on the rubber block side, and the other opening 8B is opened on the diaphragm side, and a bar-shaped weight 9 bent in an arc shape is accommodated therein so as to be freely movable in the arc direction.

Stoppers 10 are provided in the vicinity of the openings at both ends of the orifice 8 to cross the orifice.

Third embodiment (see Figures 4 and 5) Similar to the second embodiment, an arcuate tunnel-shaped resonant orifice 8
A weight 9 of the same shape is housed in the orifice 8, and steps 10 are formed on the inner wall near both ends of the orifice 8 to serve as stoppers. A weak compression coil spring 11 is provided between the stopper 10 as a spring holder and the end face of the weight 9.

Fourth Embodiment (See FIGS. 6 and 7) A fan-shaped flat resonance orifice 8 is provided within the wall thickness of the partition wall 7 along its surface direction, and a scrap-like weight 9 is placed inside it at the key position. It is housed so that it can rotate freely about the provided shaft 14 as a fulcrum. A stopper 10-10 is provided protruding from the inner wall in front of the openings 8A and 8B at both ends of the fan-shaped orifice 8. Then, a spring bar spring 11 is provided on the axis of the fulcrum shaft 13, and the weight 9
remains neutral.

Fifth Embodiment (See Figure 8) A weight 9 is placed in a resonant orifice 8 provided within the wall thickness of a partition wall 7, and is freely swung in a vertical direction using a horizontal shaft 12 provided above its center of gravity as a fulcrum. It is installed on.

Sixth embodiment (see 9y!J and FIG. 10) A gear pump consisting of a pair of gears 9A and 9B is built into the wall thickness of the partition wall 7, and the gear chamber 8 is used as an orifice, and the gears 9A and 9B are engaged with each other.
9B is used as a weight, and the kinetic energy of the liquid due to resonance is converted into the rotational energy of the gears 9A and 9B, which functions in the same way as increasing the mass of the liquid in the orifice.

The mount rubbers of the present invention, for example, as shown by the symbol R in FIG. 11, when attaching the engine E to the center beam B of the body, the mount rubbers can be arranged in pairs on both sides of the engine E in the vibration direction and tightened with bolts. It is something that sticks. Engine E
The center of the bottom surface of the beam B is positioned by a stop rubber S. It may also be used when attaching a suspension frame to the body.

C1 Effects of the Invention The liquid-filled mount rubber of the present invention has the following features:
Since a weight 9 made of a material having a mass larger than the enclosed liquid is housed in the resonant orifice 8 so as to be able to move in the direction of the flow path, a part of the liquid in the resonant orifice 8 is replaced by the weight 9. Even if the mass inside the orifice increases and the size of the mount rubber is small, the necessary resonance mass can be easily secured without increasing the flow path resistance inside the orifice. Even mold mount rubber has the effect of providing sufficient damping action.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional front view of the first embodiment of the mount rubber of the present invention, FIG. 5 is a longitudinal sectional front view and a partially cutaway plan view of the resonant orifice portion of the third embodiment, and FIGS. 6 and 7 are a longitudinal sectional front view and partially cutaway plan view of the resonant orifice portion of the fourth embodiment. Figure 8 is the fifth
FIGS. 9 and 10 are longitudinal sectional front views of the sixth embodiment, transverse plan views of the resonant orifice portion, and FIGS.
Figure 1 is a side view showing how the mount rubber is used. 2 is a short cylinder, 4 is a rubber block, 5 is a diaphragm, 6
is a vacant chamber, 7 is a partition wall, 8 is a resonant orifice, 9 is a weight, lO
is a stopper, and 11 is a spring.

Claims (5)

[Claims] (1) In a liquid-filled mount rubber in which a liquid chamber divided into two by a partition wall is communicated by a resonance orifice provided in the partition wall, a weight made of a material with a mass larger than the enclosed liquid is moved in the direction of the flow path into the resonance orifice. A liquid-filled mount rubber characterized by being accommodated so that it can be used. (2) The liquid-filled mount rubber according to claim 1, wherein the movable range of the weight is regulated by a stopper provided in the resonance orifice. (3) The liquid-filled mount rubber according to claim 1, wherein the weight is supported within the resonant orifice by a spring component having a small spring constant. (4) The liquid-filled mount rubber according to claim 1, wherein the weight is supported in a freely swinging manner by a fulcrum provided above the center of gravity within the resonant orifice. (5) The liquid-filled mount rubber according to claim 1, wherein the weight is comprised of a pair of freely rotatable gears meshed like a gear pump.