JP2001020992A - Liquid-sealed type vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost of a liquid-sealed type vibration isolator favourably securing reliability, functions, a mounting property and an assembling property of a product by making manufacture of constitution of a partition body by vulcanizing molding in simple structure. SOLUTION: A partition body to partition a liquid sealing chamber 5 in a vibration isolator main body 1 into a main liquid chamber 5a and an auxiliary liquid chamber 5b is constituted of an orifice forming member 10a on an outer periphery of which a rubber type member is installed on an inner peripheral part of a ring member 11 on which a first orifice 9 is formed and a partition plate member 13 connected to and provided on its lower surface side, a second diaphragm 16 and a second auxiliary liquid chamber 17 are provided inside of a ring inwall part 12a to divide an inner periphery of the second orifice 15 of the rubber member of the orifice forming member 10a, the ring inwall part 12a is vulcanized and adhered on a circular inner peripheral end part of the ring member 11, and a bulkhead part forming a passage end of the second orifice 15 by extending outward from a part of the ring inwall part 12a is engaged and adhered by non-adhesion by an irregular engagement means by a groove type recessed part 18 of a groove surface for the second orifice of the member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device mainly used for vibration-proof mounting of a power unit such as an engine of an automobile.

[0002]

2. Description of the Related Art Conventionally, a liquid-filled anti-vibration mount device has been interposed between members constituting a vibration transmission system such as an engine and connected in a vibration-proof manner. A liquid filling chamber formed between the vibration isolating base of the vibration isolator main body and the first diaphragm opposed thereto,
A partition is provided for partitioning the main liquid chamber on the vibration-isolating substrate side and the sub-liquid chamber on the first diaphragm side, and an orifice is provided for communicating both liquid chambers with the partition, and the liquid flow in the two liquid chambers due to this orifice is provided. 2. Description of the Related Art There is known a liquid-filled type vibration damping device that exerts a vibration damping effect by an effect.

[0003] In such a liquid-filled type vibration damping device, there is a device in which two orifices (double orifices) are formed in the partition so as to correspond to different frequency vibrations such as shake vibration and idle vibration. (For example, JP-A-9-100866 and JP-A-9-210117).

By the way, in the liquid filled type vibration damping device in which the two orifices are provided to improve the vibration damping effect against the shake vibration and the idle vibration, the orifice length and the orifice sectional area of the partition, especially Not only is the elastic modulus of the two diaphragms an important factor in exhibiting the desired vibration damping function, but also the durability and sealing properties for maintaining the vibration damping function. Furthermore, the incorporation of the partition into the body must also be considered.

In view of the above, the inventors of the present invention disclose a partition member which is provided in the vibration isolator main body and forms the two orifices, and an upper partition member which forms a first orifice on the outer peripheral side surface. A rubber-like member forming a second orifice on the inner peripheral side of the upper partition member, and a lower partition plate member provided in contact with the lower surface side of the upper partition member. While press-fitting the member into the vibration isolator main body, the outer peripheral end of the lower partition plate member is extended radially outward,
We proposed a liquid-filled type vibration damping device that can be easily assembled while securing the reliability, functionality, and mountability of the product, as a configuration in which the extended portion is caulked and fixed to the mounting bracket of the vibration damping device main body. (Japanese Patent Application No. 10-352404).

In the above proposed device, the rubber-like member sandwiched between the upper partition member and the lower partition plate member is added to one of the upper partition member and the lower partition plate member. Although sulfur bonding is used, in this case, if all bonding surfaces are to be bonded, the manufacturing process of the rubber member becomes complicated,
Increases cost.

For example, when the partition wall forming the passage end of the second orifice is integrally formed with the annular inner wall defining the inner periphery of the second orifice by a practical rubber member, the partition wall is formed together with the annular inner wall. In order to vulcanize and bond to the orifice groove surface of the upper partition member, it is necessary to apply an adhesive accurately to a predetermined position of the orifice groove surface, which is a troublesome operation that is troublesome in manufacturing. become.

In the present invention, in particular, the structure of the partition body is made to be a structure that can be easily manufactured by vulcanization molding, and the reliability of the product is improved.
An object of the present invention is to provide a liquid-filled type vibration damping device which ensures good functionality, mountability and assemblability at low cost.

[0009]

According to the present invention, there is provided a flow sealing type vibration damping device comprising a liquid filling chamber formed between a vibration damping base of a vibration damping device main body and a first diaphragm opposed thereto. A liquid filling type vibration damping device comprising a main liquid chamber on the vibration isolating substrate side and a sub liquid chamber on the side of the first diaphragm, and a partition having an orifice for communicating these two liquid chambers. The partition body is formed of a rubber-like member having an inner periphery of a second orifice formed on an inner periphery of an annular member having a first orifice formed on an outer peripheral side surface thereof and having a second diaphragm formed on an inner side thereof. An orifice forming member attached thereto; and a partition plate member provided in contact with a lower surface side of the orifice forming member to close a lower surface side of the second orifice, and an inner periphery of the second orifice in the rubber member From the annular inner wall A second sub-liquid chamber that communicates with the second orifice is formed in one end of the annular member; the annular inner wall of the rubber member is vulcanized and bonded to an inner peripheral end of the annular member; A partition wall extending outwardly from a part of the portion and forming a passage end of the second orifice is non-adheredly engaged with the groove surface for the second orifice of the annular member by means of concave and convex engaging means. Features.

In the case of this liquid filled type vibration damping device, the first orifice and the first diaphragm on the sub liquid chamber side, and the second orifice,
By setting the orifice and the second diaphragm on the side of the second sub-liquid chamber so as to effectively exhibit the vibration damping action in different frequency ranges, for example, the vibration in the two frequency ranges of the shake vibration and the idle vibration is respectively achieved. The damping action is well exhibited.

In the orifice forming member in the structure of the partition in the vibration isolator main body, the rubber-like member attached to the inner peripheral portion of the annular member has an annular inner wall portion defining the inner periphery of the second orifice. The vulcanized adhesive is applied only to the inner peripheral end of the annular member, and the partition wall extending outward from the annular inner wall to form the passage end of the second orifice is adhered to the orifice groove surface of the annular member. Since there is no need to apply an adhesive to the portion of the orifice groove surface where the partition wall is joined during vulcanization molding, there is no need to apply an adhesive. Since it is only necessary to apply the adhesive only to the peripheral end portion, the application of the adhesive does not require much accuracy, and the vulcanization molding operation is facilitated. In addition, the partition is securely engaged and fixed at a predetermined position on the orifice groove surface by the concave / convex engaging means without fear of detachment.

In particular, a concave groove is formed in the groove surface for the second orifice of the annular member to which the partition of the rubber member is engaged, and a part of the partition is inserted into the concave groove by vulcanization molding. In the case where the partition wall is fastened and engaged, the concave groove can prevent the displacement, the partition wall can be fixed with good stability, the sealing performance of the partition wall can be maintained well, and the passage end of the second orifice can be fixed. Short circuit at the partition wall portion can be reliably prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the embodiments shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a liquid-filled type vibration damping device according to the present invention, FIG. 2 is a perspective view showing a part of a partition body cut off, and FIG. 3 is an orifice constituting the partition body. FIG. 4 is a plan view of the lower surface side of the orifice forming member, FIG. 5 is a cross-sectional view taken along line XX of the previous figure, and FIG.
7 is a sectional view taken along line ZZ.

The liquid filled type vibration damping device (A) of this embodiment is
As shown in the figure, an upper mounting bracket (2) mounted on a vibration source side such as an engine, a lower mounting bracket (3) mounted on a vehicle body side, and these two mounting brackets (2) and (3) are connected to each other. Liquid between the vibration-proof base (4) made of a rubber elastic body and the vibration-proof base (4) disposed on the side of the lower mounting bracket (3) opposite to the vibration-proof base (4). A first diaphragm (6) constituting a chamber (5), and these constitute a vibration isolator main body (1).

In the case shown in the figure, the vibration-isolating substrate (4) has a substantially truncated cone shape, and its upper end on the small diameter side is vulcanized and bonded to the upper mounting bracket (2), and the outer periphery on the lower large diameter side. The part is vulcanized and adhered to the cylindrical body fitting (7), and the cylindrical body fitting (7)
Is caulked and fixed to the lower mounting bracket (3).

Further, in the vibration isolator main body (1), the liquid filling chamber (5) is provided with a main liquid chamber (5a) on the vibration isolating base (4) side and on the first diaphragm (6) side. Sub liquid chamber (5
b) is provided. The partition body (10) is fitted in an airtight state around the inner periphery of the cylindrical main body (7) via a seal rubber layer (41) integrally formed with the vibration-proof base (4). The partition (10) has two orifices (9) and (15) as described later.
And the second diaphragm (16) and the second auxiliary liquid chamber (17)
The two orifices are provided so as to exhibit a vibration damping function in different frequency ranges by the two orifices and a vibration insulating function by the vibration-proof base.

The upper mounting member (2) has a flat plate shape, and a mounting bolt (21) fixed by press-fitting means or welding means is protruded upward from the center thereof.
(22) is a positioning projection. Then, the projection (22) is moved with respect to the power unit of the automobile (not shown).
And fixed by the mounting bolts (21). Reference numeral (23) denotes a stabilizer fixed to the upper mounting bracket (2) by welding means or the like, and the upper mounting bracket (2) due to deformation of the vibration-proof base (4).
At the time of large displacement, abuts against the overhanging portion (42) provided on a part of the large-diameter side of the vibration-proof base (4) so as to perform a stopper action for restricting further vertical displacement. It is provided in.

The lower mounting member (3) has a substantially cylindrical shape with a bottom, and a lower end portion (71) of the cylindrical main body (7) is swaged with respect to a flange-shaped opening edge (31). Fixed. A mounting bolt (33) to the vehicle body side is provided on the bottom wall (32) of the lower mounting bracket (3) so as to project downward by press-fitting means. An air chamber (8) is formed between the lower mounting member (3) and the first diaphragm (6).

The first diaphragm (6) has a flexible rubber film, and the inner end of an annular support (61) is buried and integrated with the outer periphery by vulcanization bonding. A metal fitting (61) is placed on the flange-shaped opening edge (31) of the lower mounting metal (3) and, as will be described later, together with the outer peripheral end of the partition (10), the lower end of the cylindrical metal fitting (7). The part (71) is fixed by caulking.

And, regarding the partition (10),
As shown in FIGS. 2 to 7, an orifice forming member (10) constituted by an annular member (11) and a rubber-like member (12).
a) and a lower partition plate member (13) that covers the lower surface thereof, and has the following configuration.

The annular member (11) is a molded product of a metal or resin such as aluminum or the like, and has an annular shape as shown in the figure, and has a cylindrical main body of the vibration isolator main body (1) on its outer peripheral surface. A groove (90) for forming the first orifice (9) is formed with the metal fitting (7), and has a substantially U-shaped cross section. A communication portion (9) for communicating the first orifice (9) with the main liquid chamber (5a) side is provided at an upper edge (11a) of the second orifice groove (90).
a) is formed, and the lower edge portion (11b) is connected to the communication portion (9a) by the vertical wall portion (9) provided in the groove (90).
A communication portion (9b) for communicating the first orifice (9) with the auxiliary liquid chamber (5b) is provided at a position opposite to the side of (1). Further, the annular member (11) is provided with an inner flange-shaped central plate (14) having a circular central opening at the upper part on the inner side of the groove bottom wall (92).

The central plate (14) of the annular member (11)
A rubber-like member (12) forming a groove serving as a second orifice (15) with a lower opening between the inner peripheral end (14a) and the groove bottom wall (92) is formed by vulcanization bonding means. Has been worn,
Thus, an orifice forming member (10a) is formed.

The rubber-like member (12) is made of rubber or resin elastomer, has an annular inner wall (12a) defining the inner periphery of the second orifice (15), and has a second diaphragm (16) inside thereof. ) Is formed, and further surrounded by the second diaphragm (16) and the lower partition plate member (13) inward of the annular inner wall portion (12a),
And the second orifice (1) through the communication portion (17a).
A second sub liquid chamber (17) communicating with 5) is formed.
The rubber-like member (12) has the annular inner wall portion (12
Part (a), for example, a partition part (15a) extending outward along the communication part (17a) and forming a passage end of the second orifice (15) is integrally formed. The second orifice (15) is in communication with the communication portion (17a).
a) at a position on the opposite side with respect to the communication portion (9b) of the first orifice (9).
It communicates with the auxiliary liquid chamber (5b) and the first orifice (9) through b).

As the means for attaching the rubber-like member (12) to the annular member (11), the annular inner wall portion (12a) includes a central plate portion (14) of the annular member (11).
Vulcanized and bonded to the circular inner peripheral end (14a) of
The partition part (15a) is non-adhered to the groove surface for the second orifice of the annular member (11), that is, the groove side surface (15b) and the groove bottom surface (15c) facing downward by the concave and convex engaging means. ing. In the case of the figure, the base of the annular inner wall portion (12a) is bonded from the lower surface side of the inner peripheral end (14a) of the central plate portion (14) to the inner peripheral surface.

Specifically, when the rubber-like member (12) is vulcanized and bonded to the annular member (11), the base of the annular inner wall portion (12a) of the annular member (11) is The adhesive is applied only to a predetermined range to be bonded, that is, from the lower surface side of the inner peripheral end portion (14a) of the central plate portion (14) to the inner peripheral surface. At this time, if the inner peripheral end (14a) is circular, the adhesive can also be applied mechanically by rotating the annular member (11). (B) shows an adhesive application range. As shown in FIGS. 4, 6 and 7, the partition wall (15a) is formed on the groove side surface (15b) and the groove bottom surface (15c), which are the groove surfaces for the second orifice of the annular member (11). A groove-shaped concave portion (18) extending continuously in the transverse direction is formed at a predetermined location where is engaged.

Thus, the second orifice (15), the second orifice (15)
Diaphragm (16) and second sub-liquid chamber (17)
Are integrally vulcanized and molded by a predetermined vulcanization mold.
As a result, in the rubber member (12), only the base of the annular inner wall (12a) defining the inner periphery of the second orifice (15) is integrated with the inner peripheral end (14a) of the annular member (11). On the other hand, at the partition (15a),
A part of the rubber of the partition wall portion (15a) is part of the recess (1) with respect to the groove bottom surface (15c) of the groove side surface (15b) for the second orifice.
8), it is engaged with the concave and convex, and is engaged at a predetermined position in a non-adhered state.

As described above, the partition wall (15a) of the rubber-like member (12) is engaged without bonding, so that during the vulcanization molding, the partition wall (15a) adheres to a portion other than the inner peripheral end (14a). It is not necessary to apply the agent accurately, the work is easy, the manufacturing process can be simplified, and the manufacturing cost can be reduced. Moreover, the rubber is inserted into and engaged with the groove-shaped concave portion (18), whereby the partition wall portion (15a) can be stably held without a risk of displacement, and the sealing property is also held satisfactorily. A short circuit at the partition end (15a) at the passage end of the second orifice (15) can be reliably prevented.

Although it is possible to form the concave portion (18) intermittently, it is desirable to form the concave portion (18) in a continuous groove shape in the illustrated embodiment from the viewpoint of sealing performance.
If the concave portion (18) is formed in a dovetail shape, the partition (15a) is more securely and securely fixed to the annular member.

The lower partition plate member (13) has a substantially disk shape formed by press-forming a metal flat plate.
The lower surface of the second orifice (15) and the lower surface of the second auxiliary liquid chamber (17) which press the annular member (11) and the rubber-like member (12) against the lower surface of the orifice forming member (10a) and open downward. The side is closed. The partition plate member (13) is provided with an opening (13a) at a location corresponding to the communication portion (9b), and communicates with the sub liquid chamber (5b).
The outer peripheral edge of the partition plate member (13) extends radially outward, and the extended portion (13b) is connected to the opening edge (31) of the lower mounting bracket (3) and the first diaphragm (6). ) And the lower end (71) of the tubular main body (7) together with the support (61).

A liquid-filled type vibration damping device having the above structure (1)
To assemble, the lower opening side of the cylindrical main body fitting (7) connected to the upper mounting fitting (2) via the vibration isolating base (4) is set upward in the liquid, and With the air removed, the orifice forming member (10a) composed of the upper annular member (11) and the rubber-like member (12) manufactured as described above is attached to the cylindrical main body (7). Around the periphery of the upper edge portion (11
a) is press-fitted to a position where it comes into contact with the notch step (43) of the vibration-proof base (4). Further, from above, the partition plate member (13) is placed inside the lower end portion (71) of the tubular main body metal fitting (7) in the expanded state (the chain line in FIG. 1) before caulking.
2) is press-fitted or inserted to a position where it comes into contact with the orifice forming member (10a), and then the support fitting (61) of the first diaphragm (6) is press-fitted or inserted.

Thus, the first diaphragm (6)
After the liquid is sealed in the inner chamber between the base and the vibration isolating base (4), the residual liquid is adjusted, and the liquid is taken out to the atmosphere, and the lower end (71) of the cylindrical main body (7) is lowered. The opening edge (31) of the side mounting bracket (3) is fitted and caulked and fixed at the lower end (71) to complete the assembly.

In this way, the partition body (10) is formed by the notch step (43) of the vibration isolating base (4) and the lower mounting bracket (3).
And the first orifice (9) and the second orifice (15) having a predetermined length and cross-sectional area can be liquid-sealed and easily assembled. be able to.

In particular, an orifice forming member (10a) composed of an upper annular member (11) and a rubber-like member (12) integrated by vulcanization molding, and a lower partition plate member (1).
3) can be separately press-fitted or inserted in the liquid layer and can be caulked and fixed in the atmosphere, so that no special jig is required, the assembly process can be simplified, and highly reliable liquid-filled vibration damping is achieved. A device can be obtained.

In the liquid filled type vibration damping device (1) of the present invention having the above structure, the upper mounting bracket (2) is connected to a power unit such as an engine, and the lower mounting bracket (3) is connected to the vehicle body side member. Used by attaching to

In this state of use, when vibration is transmitted from a vibration generator such as an engine mounted on and supported by the upper mounting member (2), the main liquid is caused by the elastic deformation of the vibration isolating base (4) made of a rubber elastic body. The liquid in the chamber (5a) and the sub liquid chamber (5b) is supplied to the first orifice (9) and the second orifice (1).
5), and the vibration isolation effect is exhibited by the liquid column resonance action and the liquid pressure damping action in the orifice due to the flow.

The first orifice (9) and the first diaphragm (6), and the second orifice (15) and the second
The diaphragm (16) is set so that the vibration damping action can be effectively exerted in different frequency ranges. For example, the cross-sectional area and length of the first orifice (9) are used for measures against low-frequency large-amplitude vibration of 10 to 15 Hz such as shake vibration, and the cross-sectional area of the second orifice (15) is used. And length, 30 ~ such as idle vibration
It is set as a countermeasure for medium frequency vibration of 40 Hz. As a result, the anti-vibration effect can be satisfactorily exhibited in both the frequency ranges of the shake vibration and the idle vibration.

In particular, since the second orifice (15) and the second diaphragm (16) are integrally formed by the rubber-like member (12), their dimensions can be easily changed, and the required characteristics can be changed. Can be easily handled.

[0039]

As described above, according to the present invention, it is easy to incorporate a partition body in which the second orifice and the second diaphragm are set inward in the vibration isolator main body, and to take measures against shake vibration. Further, it is possible to easily obtain a liquid-filled type vibration damping device provided with two orifices and a diaphragm for countermeasures for idle vibration and having excellent reliability, functionality, and mountability.

In particular, the orifice forming member constituting the partition member is formed by vulcanizing a rubber-like member attached to the inner peripheral portion of the annular member to the annular member only at the annular inner wall defining the inner periphery of the second orifice. The partition wall, which is adhered and extends outward from the annular inner wall to form the passage end of the second orifice, is configured to be non-adheredly engaged by the concave-convex engagement means, so that it is troublesome to accurately apply the adhesive. No application is required, the application operation can be performed easily, and the manufacturing cost can be reduced. Moreover, since the partition is securely fixed to the predetermined position of the orifice groove surface by the concave and convex engaging means without fear of detachment, it does not affect the function as the partition and deteriorates reliability. I won't let you.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a liquid filled type vibration damping device of the present invention.

FIG. 2 is a perspective view, partially cut away, showing an orifice forming member and a partition plate member which constitute a partition body of the vibration isolator.

FIG. 3 is a perspective view of the orifice forming member turned upside down in the embodiment.

FIG. 4 is a plan view of the lower surface side of the orifice forming member.

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is a sectional view taken along line YY of FIG. 4;

FIG. 7 is a sectional view taken along the line ZZ of FIG. 4;

[Description of Signs] (A) Liquid-filled vibration damping device (1) Vibration damping device main body (2) Upper mounting bracket (3) Lower mounting bracket (4) Vibration-proof base (5) Liquid filling chamber (5a) Main Liquid chamber (5b) Sub-liquid chamber (6) Second diaphragm (7) Cylindrical body fitting (8) Air chamber (9) First orifice (10) Partition body (11) Annular member (12) Rubber member (12a) ) Annular inner wall part (13) Partition plate member (14) Central plate part (14a) Inner peripheral end part (15) Second orifice (15a) Partition part (16) Second diaphragm (17) Second auxiliary liquid chamber (18) ) Groove-shaped recess (71) Crimped lower end

Claims (2)

[Claims] A liquid filling chamber formed between a vibration isolating base of a vibration isolator main body and a first diaphragm opposed thereto is provided with a main liquid chamber on the vibration isolating base side and a first diaphragm side. In a liquid-filled type vibration isolator provided with a partition having an orifice for partitioning between a sub-liquid chamber and communicating the two liquid chambers, the partition has an annular shape in which a first orifice is formed on an outer peripheral side surface thereof. An orifice forming member having an inner periphery defining a second orifice inner periphery and a rubber-like member having a second diaphragm formed on the inner periphery thereof; and a lower surface side of the orifice forming member And a partition plate member that is provided in contact with the second orifice and closes a lower surface of the second orifice. The rubber-like member has an annular inner wall defining an inner periphery of the second orifice at an inner peripheral end of the annular member. Vulcanized and adhered to the annular inner wall Partition wall which forms a passage end of the second orifice extending outward from a portion of a second of said annular member
A liquid-filled type vibration damping device characterized by being non-adheredly engaged with a groove surface for an orifice by a concave and convex engaging means. 2. A groove-shaped concave portion is formed in a groove surface for a second orifice of an annular member to which a partition portion of the rubber member is engaged, and a part of the partition portion is filled in the concave portion by vulcanization molding. 2. The liquid-filled type vibration damping device according to claim 1, which is inserted and engaged.