JPH0266335A - Cylinder-formed liquid sealing vibrationproofing mount - Google Patents

Abstract

PURPOSE:To cut off the transmission of vibration and improve the absorption of impact energy by providing a block member or a piston member with narrow passages for communicating a first chamber with a second and a third chambers. CONSTITUTION:The liquid filled in a second and a third chambers 8, 9 with variable volumes flows in arrow passages 6 formed as orifices especially against the low frequency vibration applied in the small diameter direction of a piston member 4, of the low frequency vibrations applied in the right-angled direction against an axis member 1 and the axis of an outer cylinder 2. A block member 3 and the piston member 4 play a role of a stopper against a large input attempting to provide a big deformation. The transmission of vibration is thus cut off and the absorption of impact energy is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is suitable for an automobile engine support mount, and is a cylindrical liquid-filled mount that can exert a large damping effect on vibrations applied in one direction perpendicular to the axis. Regarding anti-vibration mount.

(Prior art) In a front-wheel drive vehicle in which the engine is disposed in the engine compartment at the front of the vehicle to drive the front wheels, transmission, acceleration and deceleration,
It is a well-known fact that liquid-filled vibration-isolating mounts, which effectively dampen vibrations applied in one direction perpendicular to the axis, are often used to support engines in a vibration-isolating manner during braking. An example of this type of anti-vibration mount is
It is disclosed in Japanese Patent No. 65935.

(Problem to be Solved by the Invention) This disclosed anti-vibration mount has a single part facing an outer sleeve that is press-fitted into an outer cylinder to form a liquid chamber.
A structure in which a pair of windows is provided is essential, and problems such as an increase in the cost of metal fittings and a complicated rubber mold are unavoidable.

In addition, since the initial spring characteristics are determined by the rubber elastic body filled between the inner cylinder and the outer sleeve and surrounding the liquid chamber, it is difficult to provide very soft initial spring characteristics, and attempts are made to make them more flexible. Then, it is necessary to reduce the thickness of the rubber elastic body or use a material with low rubber hardness, and this rubber elastic body becomes an important wall member of the liquid chamber. Since the rubber layer also serves as a support member connecting the inner cylinder and the outer cylinder, making the rubber layer thin or using a material with low hardness poses reliability problems from the viewpoint of liquid sealing.

Focusing on these problems, the present invention was made to improve the problem, and it has a very soft initial spring characteristic, a low dynamic spring constant against high frequency vibration, and a liquid for sealing the liquid. It is an object of the present invention to provide a vibration-proof mount of this type that can easily configure a chamber and has high reliability at a low cost.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a shaft member made of a cylindrical body, etc., a shaft member made of a cylindrical body etc. with respect to this shaft member, and a shaft member concentric with this shaft member. an outer cylinder disposed in the outer cylinder; at least two ring-shaped block members fitted into the outer cylinder with a predetermined distance between them; and an elastic body that can be brought into close contact with the inner wall of the outer cylinder; Formed into an elongated circular plate having a large diameter part and a small diameter part larger than the inner diameter of the block member,
A piston member whose center part is fitted into the shaft member and which is sandwiched between adjacent block members so as to be slidable in the direction of the small diameter part, and which surrounds the piston member and the block member from both sides to form an outer cylinder. A pair of flexible outer wall materials that maintain airtightness between the shaft member, the outer wall material, the outer cylinder, the block member, and the piston member on both sides of the piston member. A pair of first chambers exist, a second and third chambers are surrounded by the outer cylinder, an adjacent block member and a piston member and are symmetrical with respect to the shaft member, and the first chamber is a second chamber.
A narrow passage provided in the block member or the piston member for communication between the chamber and the third chamber, and a narrow passage provided in the block member between the surface facing the first chamber and the surface facing the second and third chambers. It is characterized by comprising a diaphragm whose facing surface is movable in a direction perpendicular to the vibration direction of the piston member, and a liquid sealed in the first to third chambers.

(Function) Since the present invention has a structure in which a pair of outer wall materials are independently used as wall materials for the liquid chamber, it has the advantage that it can be changed to a flexible material or a material with high hardness at will, and the initial spring characteristics are Both soft and hard items can be manufactured easily.

In particular, in response to vibrations applied in the direction of the small diameter portion of the piston member, volume changes occur in the second and third chambers, causing the sealed liquid to flow through the narrow passage.
Since it moves through the first chamber, large attenuation is obtained, and
When an input that results in a large deformation is applied, the block member and the piston member can act as a stop and absorb energy.

In addition, since the diaphragm body is displaced according to the vibration of the liquid when vibrations in a high frequency range are applied, it is necessary to prevent the internal pressure from increasing in the second or third chamber and to lower the dynamic spring constant during high frequency vibrations. This helps reduce high-frequency vibration transmission.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In Fig. 1, (1) is a shaft member made of a highly rigid cylindrical body such as a steel pipe, (2) is an outer cylinder arranged concentrically with respect to the shaft member (1), and the outer cylinder (2) is a highly rigid cylinder. The body is empty.

(3) is a block member in the shape of two or more rings, which is formed from a ballistic body such as a hard synthetic resin, a highly rigid steel plate, or an elastic hard rubber, and has an outer diameter of It is shaped like a donut plate with an inner diameter that is large enough to be press-fitted into the outer cylinder (2), and whose inner diameter is considerably larger than that of the shaft member (1), and the thickness of the piston member (4) to be described later. They are fitted into the outer cylinder (2) with a predetermined pitch corresponding to the distance between them, and are arranged coaxially with each other.

(4) is a piston member formed into an elliptical plate made of an elastic material such as hard rubber, and has a large diameter portion that is large enough to come into close contact with the inner wall of the outer cylinder (2), and a block member (3). It has a small diameter part that is larger than the inner diameter of the block member (
3) It is sandwiched between the parts so as to be slidable in the direction of the small diameter part, and
The shaft member (11) is externally fitted through a through hole provided at the center of the plate.

Since this piston member (4) is arranged to be interposed between the block members (3), in this case, one fewer piston member than the block members (3) is required.

With this configuration, the outer cylinder (2) is surrounded by a pair of adjacent block members (31, (3) and the piston member (4), and is arranged symmetrically with respect to the shaft member (1). A sealed second chamber (8) and a third chamber (9) each having a crescent-shaped cross section perpendicular to the axis are formed.

(5) is an outer wall material, which is made of a flexible material and spans between the end of the shaft member (1) and the end of the outer cylinder (2), and both ends are connected to the member (1). ), (21), and is arranged so that the block member (3) and piston member (4) are enclosed so that they cannot be seen from the outside.

In the example shown in Fig. 1, the outer wall material is a ring-shaped rubber bellows having concentric folds, and the outer sleeve 0ω and the inner sleeve Qll are integrally attached to the outer and inner peripheral edges by vulcanization adhesive treatment. exists,
Both sleeves 00), αυ to outer cylinder (2) and shaft member (1)
It is firmly and airtightly attached by press-fitting it.

The outer wall material (5) has a shaft member (11) and a pair extending between both ends of the outer cylinder (2), and thus includes the shaft member +11, the outer cylinder (2), and the bellows (5). a first chamber (71, 71,
(7) are formed as a pair on both sides of the piston member (4).

The vibration-proof mount thus constructed allows the required amount of liquid to be sealed in the first chamber (7), second chamber (8), and third chamber (9).

The above-mentioned mount needs to communicate the first chamber (7) with the second chamber (8) and the third chamber (9), and in the above embodiment, the sliding contact between the block member (3) and the piston member (4) is required. A narrow passageway (6) consisting of an arcuate groove is recessed in the surface facing the second chamber (8) and the third chamber (9).

The passage (6) is provided so as to extend from the inner edge to the outer edge of the block member (3) and open into the first chamber (7) at the inner edge. For example, a modification in which a groove is provided on the piston member (4) side is also possible as long as it can function.

Furthermore, the pair of block members (3) and +31 are provided with a diaphragm body (b) inside the wall, but in the example shown in FIG. 1, the block member ( 3), and is connected to this cavity Q4),
And the block member (3) is placed in the first chamber (7) and the second chamber (8).
In addition, a large number of thin through-holes a0 extending between and penetrating the first chamber (7) and the third chamber (9) are bored, so that a diaphragm having a ring plate shape is formed in the cavity a0. It has a structure that stores the body side.

The diaphragm body (b) is a plate body made of metal, synthetic resin, or hard rubber, and is housed in the cavity Q4) so as to be movable in parallel in the axial direction of the shaft member (1). By appropriately setting the thickness, it is formed so that the amount of parallel movement is approximately several tenths of a crane.

In addition, the diaphragm body (2) has a plurality of circular through holes (13)' provided dispersedly in the block member (3), as shown in an enlarged view in FIG. A ring-shaped diaphragm body made of hard rubber or the like and having an H-shaped radial cross section (
12)' through hole (
13)' may have a structure interposed therebetween.

In addition, as illustrated in FIG. 4, the through hole q3)
By recessing circular grooves a''; It is also possible to form a thin partitioning wall and use this wall as the diaphragm body (12)''.This example differs from the other two examples in which the block member (3) and the diaphragm body are constructed separately. In contrast, the only difference is that it can be integrally constructed with the block member (3), and there is no functional difference.

The structure of the anti-vibration mount is as described above, and when this is installed in a car, such as a front-wheel drive car, as an engine support, the shaft member +11 and the axis of the outer cylinder (2) are horizontal, and the small diameter part is placed between the vehicle body and the engine so that the large diameter portion is perpendicular to the rolling direction of the engine of the vehicle body.

When the engine rotates in a rolling direction due to starting, acceleration, deceleration, braking, etc. of the vehicle, the shaft member (11) and the outer cylinder (2) become eccentric, and as a result, the piston member (4) naturally moves eccentrically.

This eccentric movement causes a change in volume of the second chamber (8) and the third chamber (9), with one increasing and the other decreasing.

At this time, a large damping effect is exerted because the liquid moves through the narrow passage (6) serving as an orifice.

In addition, if a force that causes large deformation is applied to the vibration isolating mount, the block member (3) and the piston member (
4) acts as a stopper that comes into contact with the shaft member (1) and the outer cylinder (2), thereby absorbing a large amount of impact energy.

However, in the example shown in Figure 1, the outer wall material (5) is made of rubber tongue.
Since the initial spring characteristics depend on the outer wall material (5), a very soft material can be obtained.

On the other hand, in the case of a structure that does not require soft initial spring characteristics, the outer wall material (5) is formed of an elastic block, and a narrow passage (6) as an orifice is provided on the piston member (4) side. You can also do it.

Furthermore, in order to greatly exert the vibration damping effect by the liquid, it is possible to increase the number of block members (3) and piston members (4) to form a multi-row structure, and such a modification is also within the scope of the present invention. It is included.

By the way, when high-frequency vibrations of 10011z or more propagate to the anti-vibration mount, this vibration will cause damage to each chamber (?), (81
Vibration plate body (2), (12) via the liquid in ゜(9)
' , (12)'', and the diaphragm body is displaced in a direction perpendicular to the vibration direction of the piston member (4), thereby preventing an increase in the internal pressure in the second chamber (8) or the third chamber (9). Been,
The dynamic spring constant can be lowered, effectively blocking vibration transmission.

(Effects of the Invention) The present invention provides low-frequency vibrations applied in a direction perpendicular to the axes of the shaft member (1) and outer cylinder (2), especially those applied in the direction of the small diameter portion of the piston member (4). As a result of the liquid filling the second chamber (8) and the third chamber (9), which change in volume, flowing through the narrow passage (6) serving as an orifice, a large damping effect is produced, thereby blocking vibration transmission. It has a remarkable effect on

Furthermore, since the block member (3) and the piston member (4) play the role of a stopper against a large input that attempts to cause a large deformation, the impact energy can be well absorbed.

Further, in the present invention, if the outer wall material (5) is formed of bellows, it is possible to easily provide a material having very soft initial spring characteristics.

Moreover, for high frequency vibration, the diaphragm @ each chamber (8)
, (9) because it suppresses the increase in internal pressure and contributes to a decrease in the dynamic spring constant, it effectively acts to block vibrations and has an excellent vibration-proofing effect against a wide range of vibrations.

Furthermore, since each component of the present invention is either a cylinder or a plate, the structure and assembly are simple, so manufacturing costs can be kept low.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an axial cross section according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line nn in FIG. 1, and FIGS. 3 and 4 are enlarged sectional views of block member portions on each side of the present invention. +11...shaft member, (2)...outer cylinder, (3)...
・Block member, (4)...Piston member, (5)...Outer wall material, (6)...Narrow passage, (7)...First chamber, (8)...Second chamber , (9)...Third chamber, (12)', (12)''...Vibration plate body.

Claims (1)

[Claims] 1. A shaft member made of a cylindrical body or the like, an outer cylinder arranged concentrically with the shaft member, and at least two ring-shaped blocks fitted inside the outer cylinder with a predetermined pitch maintained between them. The member is formed into an elongated circular plate having a large diameter part that can be brought into close contact with the inner wall of the outer cylinder by an elastic body and a small diameter part larger than the inner diameter of the block member, the center part of which is fitted into the shaft member, and which are adjacent to each other. A piston member is sandwiched between block members so as to be able to slide in the direction of the small diameter part, and the piston member and the block member are surrounded from both sides to maintain airtightness between the outer cylinder and the shaft member. a pair of first chambers surrounded by a pair of flexible outer wall materials, a shaft member, an outer wall material, an outer cylinder, a block member, and a piston member and existing on both sides of the piston member;
A second chamber and a third chamber are surrounded by the block member and the piston member adjacent to the outer cylinder and are symmetrical with respect to the shaft member.
chamber, a narrow passage provided in the block member or the piston member to communicate the first chamber with the second chamber and the third chamber; 3
A cylinder comprising a diaphragm whose surface facing the chamber is displaceable in a direction perpendicular to the vibration direction of the piston member, and a liquid sealed in the first to third chambers. Liquid-filled anti-vibration mount.