JPS6330623A - Liquid damping type vibro-isolating mount - Google Patents

Abstract

PURPOSE:To avoid rapid rise of liquid pressure so as to attempt easement of impact by providing a switching passage at a partitioning member by means of a fixed side supporting member and a mobile side partitioning plate, in a chamber filled with liquid. CONSTITUTION:A chamber of a closed structure is formed in a body 1 and partitioned into two chambers 8 and 9 by a partitioning member 7. The partitioning member 7 is constituted by a partitioning plate 10 having a mobile plate 19 and a ring-shaped supporting member 11, and the mobile plate 19 is engagingly locked on the partitioning plate 10. Moreover, the partitioning plate 10 and the supporting member 11 have a switching passage 16 and, an orifice 15 is provided at the ring part of the supporting member 11. When this vibro- isolating mount receives an input accompanied by its rapid change, the partitioning plate 10 moves against a spring 14 toward the chamber 9 opposite to the chamber 8 in which pressure has rapidly become positive, and the switching passage 16 is opened, so that transfer of liquid between the both chambers 8 and 9 is executed rapidly and any increase in a dynamic spring constant is prevented in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid-damped vibration-isolating mount used to support a vibrating body such as an automobile engine in a vibration-isolating manner.

(Prior art) This type of liquid damping vibration isolation mount was
As is known from Japanese Patent No. 15806, a pair of substrates, one of which is connected to the engine side and the other to the vehicle body frame, a cylindrical mount rubber inserted and fixed between the bases, and a cylindrical mount rubber inserted and fixed between the bases, and It consists of two chambers that are formed in a chamber and filled with a working fluid and that communicate with each other through a hole that acts as an orifice, and a partition plate that partitions these two chambers, and that is fixed to one of the substrates. A communication hole is provided in the partition plate to communicate the two chambers, and a valve made of a rigid thin plate is provided on the partition plate to cover the communication hole and float above the partition plate, and the orifice is provided independently of the communication hole. It has a structure in which a hole is provided in the partition plate to act as a bridge, and when the engine vibrates, the valve remains open and the communication hole opens, so the internal pressure in both chambers is balanced and the vibration is absorbed by the mount rubber. On the other hand, large-amplitude vibrations are damped by the elastic deformation of the valve, and as the valve closes, the fluid in the high-pressure side chamber moves to the other chamber through the orifice, which provides an effective vibration damping function. High
It exhibits anti-vibration properties against low-frequency vibrations.

(Problems to be Solved by the Invention) Although the conventional anti-vibration mount described above works effectively against various steady vibrations, it is difficult to apply sudden changes in human force to the anti-vibration mount during acceleration, etc. In this case, the valve closes and liquid flows only through the orifice, and the internal pressure of the anti-vibration mount rapidly increases, the dynamic spring constant becomes extremely large, and the pressure becomes negative. There was a problem with cavitation.

The present invention has been developed by focusing on the unsolved problem, and provides an opening/closing passageway that enables smooth flow of fluid between the two chambers only when a sudden change of input is applied. It is therefore an object of the invention to solve the above-mentioned problems in response to rapid pressure changes.

(Means for solving the problem) Therefore, the present invention provides a main body (
1) The chamber provided inside is divided into two chambers (8) by a partition member (7).
).

The chambers (8) and (9) communicate with each other through an orifice provided in the partition member (7), and a liquid is sealed in each chamber (8) and (9). This is characterized by an improved configuration of the partition member (7) in a liquid damping type vibration isolating mount, which includes 12 through holes penetrating in the plate thickness direction and a movable plate that opens and closes the through holes (2 holes). O(
The partition member (7) is formed by a partition plate 0ω having a support) and an annular support member αD that is coaxial and circumscribed around the partition plate aω, and a joint part between the partition plate 0ω and the support member (11). , respectively, cylindrical sliding surfaces [12), Q3) that are in surface contact with each other and can slide relative to each other while maintaining airtightness within a predetermined length range in a direction perpendicular to the plate surface of the partition plate 0ω. A spring element α is provided so as to press the partition plate α facing each other from both sides of the partition plate α.

At the same time, the support member αD is fixed to the neutral position with respect to the support member (11) through the support member (11).
Further, while the orifice 05) is independently provided in the support member (11), the support member αυ and the partition plate (10) are opened in a state where the relative deviation between the support member αυ and the partition plate (10) is maximized. The rain shelter is characterized in that an opening/closing passage Q61 that can communicate the two chambers (81, (9)) is provided in relation to the rain shelter contact surface Q21.03+.

(Function) By configuring the partition member (7) as described above, the present invention can prevent the partition plate (10) from reaching the maximum value with respect to the support member at+, especially when a rapidly changing input is applied to the vibration isolation mount. Since it moves until it becomes deviated, the opening and closing passage 0ω provided at Oj, which is in contact with the rain shelter, opens, and both rooms (81,!8
), (9) can be prevented from occurring, and cavitation phenomenon can also be prevented.

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

The anti-vibration mount according to the example of the present invention illustrated in FIG. 1 has a main component (1), a metal fitting (5), a diaphragm (6), and a partition member (7) as main components.

The main body (1) is a metal block (1) that has one end of a coaxially arranged metal cylinder (3) and a mounting pole (21) protruding from it.
It has a structure in which a rubber vibration isolation base (2) is integrally fixed with vulcanization adhesive between the peripheral edge of the rubber vibration isolation base (2) and the rubber vibration isolation base (2) is made of a thick rubber elastic body. When a supporting body such as an engine vibrates, this rubber vibration isolating base (2) is subjected to dynamic compressive deflection.

On the other hand, the metal fitting (5) is shaped like a hat, has a mounting bolt (22) protruding from the center and fixed therein, and has air holes (23) bored at appropriate locations. The periphery of the flange is attached to the metal cylinder (3) of the main body (1).
) and then swage it to the end of the main body (
1) to be fixed and integrated.

Next, the diaphragm (6) consists of a rubber membrane and a metal tube integrally fixed around the rubber membrane, and the metal tube (3)
The metal tube is attached to a metal tube (3) so as to cover the opening end of the metal tube.
), and by sandwiching the flange of the metal cylinder between the flange of the metal cylinder (3) and the metal fitting (5), the peripheral edge is fixed to the main body +1) in an airtight manner.

The anti-vibration mount constructed in this manner has inside the main body (1) the inner surface of the anti-vibration base (2), the inner wall surface of the metal cylinder (3) to which the rubber film is adhered, the inner surface of the metal block (4), and the diaphragm (
A chamber with a sealed structure is formed with one side of 6) as a peripheral wall surface, and a partition member (7) is provided transversely in this chamber,
This partition member (7) partitions the chamber into two vertically adjacent chambers (81, +8) and (9).

The partition member (7) includes a partition plate (1) having a movable plate α.
0, and an annular support member αυ coaxial with and airtightly circumscribed around the partition plate (10), and the partition plate GQI is formed by attaching a ring to the periphery of the disk-shaped plate. It has an integral edge that is bent in a right angle direction and further bent at a right angle toward the center of the plate, and one or more through holes 12 (11 are drilled in the disk-shaped plate). It is set up.

Said movable plate Q9) provided in relation to this partition plate aO+
consists of two plate parts that can closely follow a disc-shaped plate body having two holes (two holes), and a connecting part that connects each central part to hold the plate parts parallel to each other. The connecting part passes through a hole provided at the center of the partition plate 0ω, while the two plate parts are arranged in parallel with a slight gap on both sides of the disc-shaped plate. The movable plate 0 (to) is latched to the partition plate (10) by connecting the movable plate 0 (to) with the connecting portion in a state where they face each other.

One of the two plate parts of the movable plate α comes into contact with the disc-shaped plate of the partition plate aψ, and both the drawing board parts move so that they can be separated with a slight gap. It is necessary that the distance between the two plate parts be set to an appropriate value in relation to the thickness of the disc-shaped plate.

On the other hand, the support member (11) includes a cylindrical portion with a U-shaped cross section that can be circumscribed concentrically with an edge provided on the outer periphery of the partition plate (10), and a ring that is press-fitted into the inner wall of the metal cylindrical body (3). By appropriately determining the axial length of the cylindrical part, which has a U-shaped cross section and is integrally connected with the cylindrical part, it is possible to move the edge of the partition plate 0ω that is inscribed in this cylindrical part. Range is limited.

Thus, the edge of the partition plate αφ and the cylindrical portion of the support member αυ have a cylindrical shape that can mutually slide in an airtight manner in a direction perpendicular to the plate surface of the partition plate OO by making surface contact with each other. Sliding surface CL
2), αυ is formed, and when the support member αυ is fixed to the middle part of the metal cylinder (3) as described above, the partition plate (1
01 is movably supported within a range limited by the length of the sliding surface αm in the cylindrical portion of the support member 0υ in the cylindrical axis direction.

An appropriate number of spring elements such as coil springs (10) are distributed and interposed between the edge of the partition plate (10) and the cylindrical portion of the support member qυ on both upper and lower sides sandwiching the edge. This spring element Q4), Q4) is the partition plate (10)
On the other hand, the partition plate (10) acts counter to the support member (1) with balanced elasticity from both sides.
1), it is elastically locked at a neutral position, that is, at an intermediate position of the cylindrical portion.

Therefore, the partition plate (10 and the support member αυ constituting the partition member (7) are provided with an opening and closing passage 0 in relation to the rain shelter contact surface 0), and the ring portion of the support member αυ An orifice (15) is provided in the.

As an example of the structure of the opening/closing passage aO is shown in the figure, a plurality of holes (17+,
The holes (171, 0) are provided in a single-stage arrangement that equally divides the circumference, while the holes (171, 0) are provided on the sliding surface of the support member QO.
A plurality of holes (18A), (18
A), (18m), and (18++) are installed in the same way through the upper and lower tiers, and the partition plate 0ψ is connected to the chamber (8).
When the chambers (81, (IL) are moved upward to the limit to reduce the volume of the chambers (81, (IL)), the holes (81, (IL)
'i1 is now communicated through this communication path,
On the other hand, when the partition plate (10) is moved downward as much as possible to expand the volume of the chamber (9), the holes 07) and (
18A), and similarly connects the chamber (81, i'+1), and in normal use, the balanced elasticity of the spring elements Q41 and Q4 causes the partition plate QQI to It goes without saying that the pores Q71; (18A) and (18B) are closed since they are in the neutral position shown in the figure.

Therefore, the condition for opening the opening/closing passage 06) is that the partition plate (10) is pushed by an external force against the elasticity of the spring element α on one side.

On the other hand, the orifice α, as shown in cross section in FIG. It is divided by the plate part to form an annular passage extending almost all around the circumference, and a hole is provided that passes through the ring part from the lower end and faces one chamber (8), and similarly from the other end to the other chamber (8). The structure has a hole facing the chamber (9),
A resistance passage from one hole to the other hole via an annular passage is formed in the ring portion of the support member 0υ, and this resistance passage always connects the upper and lower chambers (8), (8), and (9). ing.

The vibration isolating mount having the structure described above has the above-mentioned chambers (8).
, (9) is filled with a liquid such as antifreeze, thus completing a liquid damping vibration isolation mount.

When this anti-vibration mount is used as an engine support in a car, for example, high-frequency vibrations during driving are basically absorbed by the rubber anti-vibration base (2).

On the other hand, low and medium frequency vibrations such as idling vibrations are +81. (8), (9) liquid through orifice 05)
It is absorbed more effectively by flowing reversibly through

The vibration in this case has a large amplitude, so it is movable (anti-Q8),
One of the plate parts of (9) continues to block the through hole (2ω) of the partition plate (10), and the through hole (201) is almost never open, so the liquid can only flow through the orifice 09. It will be done.

By the way, in the high-frequency vibration region, the amplitude of vibration is small and the liquid pressure in both chambers (8), (8), and (9) usually increases, but the movable plate α is likely to vibrate, and this vibration causes penetration. The hole Qllll remains open for a long time, and the liquid also flows through the through hole (2II), so
The fluid pressure in chambers (8) and [9] decreases.

Therefore, the dynamic spring constant becomes small, and muffled sound and transmitted sound are absorbed, making it possible to suppress intrusion into the vehicle interior.

In this way, it exhibits good vibration isolation characteristics against vibrations in a wide range of low, medium, and high frequencies, but if there is a sudden change in input to this vibration isolation mount, the partition plate (10) The chamber (8) or (
9), the temporary limit-cup partition (10) moves in the direction of the cough room, opening the opening/closing passage OQ (see Figure 2), and the room (8) or ( 9), the partition plate (10) is placed in the direction of the opposite chamber (9) or (8).
(see Fig. 3), both chambers +81. Since the fluid movement between (8) and (9) is quickly carried out via the opening/closing passage 061, cavitation phenomenon and an increase in the dynamic spring constant are prevented, the impact is alleviated, and the vibration isolating mount is damaged. It can be prevented.

(Effects of the Invention) As is clear from the above description, the present invention includes a partition member (7) for partitioning the chambers (8), +8), and (9) filled with liquid, and for starting communication with the orifice (15). )
is formed by the support member OTJ on the fixed side and the partition plate QOI on the movable side, and an opening/closing passage αQ is provided in the partition member (7) that opens when the partition member (7) shifts against elasticity. Therefore, if a sudden input is applied to the vibration isolation mount, the chamber (1111, (8)
) and (9), a rapid increase in liquid pressure can be avoided, and cavitation due to negative pressure can be prevented.

In this way, an excellent effect of preventing the vibration-proof mount from being damaged and alleviating the impact can be achieved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of an example of the present invention, and FIGS. 2 and 3 are enlarged views of the main parts of the partition member in FIG. 1, showing the operating state when negative pressure and positive pressure are applied. Show each. (11...Main body, (2)...Rubber vibration isolation base, (7)...Partition member, +81 ('
l)......room, 0's...partition plate, 0υ
...Supporting member, 0 of 01...Sliding surface,
a41... Spring element, (10)...
Orifice, 0ω, old...Opening/closing passage, 0cm...
- Movable plate, (20)...through hole. Figure 1

Claims (1)

[Claims] 1. A chamber provided in the main body (1) facing the rubber vibration isolating base (2) is partitioned into two chambers (8) and (9) by a partition member (7). 9) The partition member (7)
) communicates through an orifice (15) provided in the
In a liquid damping type vibration isolating mount in which liquid is sealed in each chamber (8), (9), a through hole (2
0) and a movable plate (19) for opening and closing the through-hole (20); (7), the partition plate (10) and the support member (1
1), a cylindrical sliding surface that can make surface contact with the partition plate (10) and slide relative to the partition plate (10) while maintaining airtightness within a predetermined length range in a direction perpendicular to the plate surface of the partition plate (10). (12) and (13) are provided, respectively, and the partition plate (10) is pressed via spring elements (14) and (14) that can face each other from both sides of the partition plate (10).
The support member (11) is locked in a neutral position and the support member (11) is fixed to the main body (1), and the orifice (15) is independent of the support member (11). an opening/closing passageway (16) which opens and connects the two chambers (8) and (9) when the relative displacement between the support member (11) and the partition plate (10) is maximized; A liquid damping type anti-vibration mount, characterized in that: is provided in relation to both sliding contact surfaces (12) and (13).