JPH084827A - Liquid sealed vibration control device - Google Patents

Abstract

PURPOSE:To improve durability of a diaphragm by improving the contour structure of the peripheral end parts of a contact frame member and a partition wall member, and provide cost reduction in a junction method between the contact frame member and the partition wall member. CONSTITUTION:The peripheral end part of a partition wall member 17 which partitions the liquid chamber of a liquid sealed vibration control device into a pressure receiving liquid chamber 20 and a sub liquid chamber 15 is covered with the peripheral end part of a contact frame member 16 which forms the sub liquid chamber 15 in cooperation with a diaphragm 14 by forming a restricting passage 18 which allows the pressure receiving liquid chamber 20 to communicate with the sub liquid chamber 15 to prevent stress concentration at a close contact surface on the contact frame member side of the diaphragm, improve durability of the diaphragm, and provide cost reduction in a junction method between the partition wall member 17 and the contact frame member 16.

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 provided between a vibration generating part and a vibration receiving part for absorbing vibration, and particularly to durability of components forming a sub liquid chamber. Regarding the improvement of.

[0002]

2. Description of the Related Art As a vibration isolator used for an engine mount, a body mount, etc. of a vehicle such as an automobile, there is a liquid filled vibration isolator 100 as shown in FIG.

As shown in FIG. 3, this conventional vibration isolator 100 has a base plate 111 as a lid member, which is pressed by a thick metal plate, and which is a base plate 11.
1, a mounting bolt 112 is provided upright so that the mounting bolt 112 can be mounted on the vibrating portion or the vibration receiving portion.

A diaphragm 114 made of a polymer material is disposed above the base plate 111 to form an air chamber 113 with the inner surface of the base plate.

Further, on the upper side of the diaphragm 114, there is disposed a contact frame plate 116 made by pressing a thin metal plate which forms the sub liquid chamber 115 together with the diaphragm. On the upper side of the contact frame plate 116, a partition member 117, which is similarly formed by pressing a thin metal plate, is arranged to form a limiting passage 118 together with the contact frame plate 116.

An elastic body 119 is arranged above the partition member 117 to form a pressure receiving liquid chamber 120 together with the partition member 117. The pressure receiving liquid chamber 120 communicates with the sub liquid chamber 115 by the limiting passage 118. The liquid chamber and the restriction passage are filled with a liquid such as water or oil, and are collectively referred to as a liquid chamber.

The above-mentioned base plate 111, diaphragm 114, abutment frame plate 116, partition member 117,
A cylindrical metal outer frame 121 as a frame member that surrounds the elastic body 119 and the like is disposed by vulcanization adhesion to the elastic body 119, and the lower end portion of the outer frame 121 is bent. To form a flange portion 122, and the end of the lower end portion is crimped firmly from the peripheral portion of the base plate 111 to form a diaphragm 114, an abutting frame plate 116, and a partition member together with the base plate 111. The peripheral portions of 117 are sandwiched to secure the airtightness of the peripheral portions.

Further, a connecting plate 123, which is a thick metal plate as a connecting member, is disposed on the upper side of the elastic body by being vulcanized and bonded to the elastic body 119. At the center of the connecting plate 123, a mounting bolt 124 that is connected to the vibration generating portion or the vibration receiving portion is erected.

The metal fitting 125 is formed by pressing a metal plate and has communication holes formed in the bottom and side portions of the metal 125.
It has a function of limiting the deformation of the elastic body 119 when it is embedded in the inside and is input with vibration from the outside, but is not directly related to the present invention.

[0010]

By the way, in the above conventional vibration isolator, the metal contact frame plate 116 and the peripheral edge of the partition member 117 are overlapped and welded to each other. As shown in FIG. 3, the peripheral edge portions of the metal plate have exposed corners 126 of the metal plate, and are covered with rubber diaphragms. . When the vibration isolation device 100 is attached to a main part of a vehicle body and is used, a vibration input from the vibration generating part causes the rubber diaphragm to repeatedly expand and contract,
Therefore, there has been a problem that the rubber of the portion covering the angled cutting edge 126 of the metal plate repeats contact friction with the angle of the cutting edge and eventually fatigue cracks occur.

Further, as one of the measures for reducing the manufacturing cost of the vibration isolator, attention has been paid to the reduction of the manufacturing cost of the member constituting the restricted passage, and in particular, the contact frame plate and the partition member as the constituent members. Reassessment of the conventional high-cost welding method has been an issue due to the cost reduction of the joining method.

In view of the above situation, an object of the present invention is to improve the structure of the limiting passage forming member, particularly the shape of the peripheral portions of the abutting frame member and the partition member to improve the durability of the diaphragm. At the same time, the cost of the method of joining the contact frame member and the partition member can be reduced.

[0013]

In order to achieve the above object, in the liquid-filled type vibration damping device of the present invention, as described in claim 1, a coupling connected to one of the vibration generating portion and the vibration receiving portion. A member, a tubular frame member that is connected to the other of the vibration generating portion or the vibration receiving portion, an elastic body that is disposed between the connecting member and the frame member and is deformable when vibration occurs, and the frame A liquid chamber provided in the member, a partition member for partitioning the liquid chamber, a pressure receiving liquid chamber capable of expanding and contracting the partition member and the elastic body as a part of the partition, and installed inside the partition member. A contact frame member that forms a restriction passage, a sub liquid chamber that communicates with the pressure receiving liquid chamber through a restriction passage provided in the partition member, and the sub liquid chamber between the contact frame member. And a diaphragm that allows expansion and contraction of the auxiliary liquid chamber and is connected to the frame member. Therefore, a vibration isolator comprising the partition wall member and a lid member that holds the peripheral edge of the contact frame member together with the peripheral edge of the diaphragm, wherein the peripheral edge of the contact frame member is folded back toward the connecting member. The peripheral edge portion of the partition member is encapsulated.

[0014]

When vibration is input to the vibration isolator according to the present invention,
The elastic body is deformed to change the pressure of the pressure receiving liquid chamber so that the liquid moves back and forth through the restriction passage, and the liquid receives passage resistance or resonates in the restriction passage to absorb the vibration. At this time, when the elastic body is deformed and the liquid is forced into the sub liquid chamber through the restriction passage due to the pressure change of the pressure receiving liquid chamber, the diaphragm expands to the air chamber side to increase the volume of the sub liquid chamber and to store the liquid. Accommodate. When the elastic body restores its deformation, the diaphragm contracts and restores its original shape. Therefore, the diaphragm repeatedly expands and contracts in response to the vibration input to the vibration isolator, and the tensile stress is repeatedly generated in each part inside the diaphragm.

In the liquid-filled vibration damping device of the present invention, since the peripheral edge of the contact frame member is folded back toward the connecting member to cover and enclose the peripheral edge end of the partition member, the peripheral edge ends of both members on the diaphragm side. It is formed so that the angled cut end of is not exposed. Therefore, when the diaphragm expands and contracts as described above, the peripheral edge portion of the diaphragm is repeatedly subjected to extension stress, but since this peripheral edge portion is in contact with the smooth surface of the abutting frame member, cutting with an angle as in the conventional example. Fatigue durability is significantly improved without extreme stress concentration at the edges.

Further, according to the present invention, the peripheral edge of the contact frame member is folded back toward the connecting member to cover and enclose the peripheral edge end of the partition wall member, and the peripheral edge of the folded back contact frame member is hardened. Since the contact frame member and the partition member member are joined and integrated, it is possible to reduce the manufacturing cost without requiring a special welding process for removing residual strain as in the conventional case.

In the liquid-filled type anti-vibration rubber to which the present invention is applied, it is the connection member, the frame member, and the frame member that are connected to the vibration generating portion such as the engine and the vehicle body of the automobile and receive various severe external forces. These are lid members, and these members need to be manufactured from thick metal plates. On the other hand, since a large amount of force does not act on the partition member and the contact frame member, they are relatively low in rigidity and easy to process. A material such as a thin metal plate can be used, and the above-mentioned folding and wrapping can be accurately and easily performed.

[0018]

Embodiments of the present invention will be described in detail with reference to FIG. As shown in FIG. 1, the liquid-filled type vibration damping device 10 is attached to a vehicle body (not shown) such as an automobile by a mounting bolt 12 fixed to the lower central portion of a base plate 11 serving as a lid member.

The base plate 11 is formed of a thick metal plate for supporting the load of the engine, and has a reverse hat-shaped cross section.

A diaphragm 14, an abutment frame member 16, a partition member 17, and a cylindrical outer frame 21 as a frame member are arranged above the base plate 11.

Like the base plate 11, the outer frame 21 is also formed of a thick metal plate to support the load of the engine. The upper end of the outer frame 21 is expanded in a taper shape, and the outer peripheral portion of the truncated cone-shaped elastic body 19 is vulcanized and adhered to the inner peripheral portion. The upper surface of the elastic body 19 is vulcanized and adhered to a connecting plate 23 as a connecting member, and a mounting bolt 24 for fixing an automobile engine (not shown) is erected on the central upper end of the connecting plate 23.

The lower end portion of the outer frame 21 is bent outward to form a recessed portion inside to form a flange portion 22, and together with the base plate 11, the diaphragm 14, the contact frame member 16 and the partition member 17. Holds the peripheral edge.

An air chamber 13 is formed between the base plate 11 and the diaphragm 14. A space defined by the elastic body 19, the outer frame 21, and the diaphragm 14 is a liquid chamber filled with a liquid such as oil or water, and the liquid chamber is separated by the partition member 17 from the pressure receiving liquid chamber 20 and the sub liquid. It is divided into a chamber 15.

The partition member 17 is a thin metal plate press-molded into a hat shape. A cylindrical portion 28 extends from the outer peripheral end of a disk-shaped partition wall portion 27 of the partition wall member 17, and a flange portion 29 projects radially outward from the lower portion of the cylindrical portion 28.

The outer peripheral surface of the tubular portion 28 is in close contact with the elastic body 19 which is thinly extended on the inner peripheral surface of the outer frame 21.

As shown in FIGS. 1 and 2, the contact frame member 16 is in close contact with the lower surface of the partition wall 27, and the contact frame member 16 is
A tubular portion 30 is integrally extended to the outer peripheral end of the top of the head portion, and a flange portion 34 projects radially outward from the lower portion of the tubular portion 30.

A recess is formed in a part of the outer periphery of the cylindrical portion 28 of the partition member 17 to form a baffle wall 31. An opening 32 is provided in a part of the partition wall of the partition member 17. An opening 33 is also provided in a part of the outer peripheral portion of the tubular portion of the contact frame member 16. When the contact frame member 16 is incorporated into the partition member 17, a ring-shaped gap partially blocked by the baffle wall 31 is formed between the cylindrical portions of both members, and this serves as the restriction passage 18.

The restricted passage 18 is formed by the openings 32 and 3
3, the pressure receiving liquid chamber 20 and the sub liquid chamber 15 communicate with each other, and the pressure receiving liquid chamber 20 and the sub liquid chamber 15 communicate with each other via a restriction passage 18.

When the contact frame member 16 is incorporated into the partition wall member 17 and the top surface of the contact frame member 16 comes into close contact with the lower surface of the partition wall portion 27, the flange portion 29 which is the peripheral edge portion of the partition wall member 17 contacts. The frame member 16 is intimately stacked on the flange portion 34 which is the peripheral edge portion. Here, as shown in FIGS. 1 and 2, the end portion of the flange portion 34 of the abutting frame member 16 is at the end of the flange portion 29 from the diaphragm side so as to completely cover the flange portion 29 of the partition member 17. The flange portion 29 is folded back toward the partition member side, and the flange portion 29 is sandwiched, and the upper portion thereof is firmly crimped.

Since the material of the contact frame member 16 is a thin metal plate, it can be easily and accurately folded back, and both flange portions of the contact frame member 16 and the partition wall member 17 are tightly crimped by caulking. Can be integrated. Therefore, it is possible to reduce the manufacturing cost without the need for special welding as in the conventional case.

Further, the contact frame member 1 formed as described above
The diaphragm 14 is disposed on the lower surface of the flange portion 34 of FIG. 6 so that the upper surface of the peripheral edge portion thereof is in close contact, and the flange ends of the partition wall member 17 and the contact frame member 16 are not present on the close contact surface of the diaphragm. Instead, the contact surface of the diaphragm is in contact with the lower surface of the flange portion 34 of the smooth contact frame member 16.

Next, the operation of the present invention will be described. When the vibration is transmitted from the engine or the vehicle body side of the vehicle to the vibration isolator via the connecting plate 23 or the outer frame 21, the elastic body 19 is deformed and the liquid in the pressure receiving liquid chamber 20 is pushed out, and the limiting passage 1
8 to fill the sub liquid chamber 15 to expand the diaphragm 14. Due to this expansion, tensile stress is generated in each portion inside the diaphragm 14. However, in the present invention,
As described above, the flange portion 29 is formed so that the peripheral edge portion of the contact frame member 16 completely covers the flange portion 29 of the partition wall member 17.
Since the end of the diaphragm is folded back from the diaphragm side toward the partition member side, the flange end of the partition member 17 and the abutting frame member 16 does not exist on the close contact surface side of the diaphragm. Therefore, the close contact of the diaphragm is prevented. Surface does not cause excessive stress concentration. Further, due to the expansion stress caused by the expansion and contraction of the diaphragm, the close contact surface of the diaphragm is not repeatedly worn and damaged due to repeated friction at the cut end corners of the flange ends of the partition wall member 17 and the contact frame member 16. Therefore, the fatigue durability of the diaphragm is significantly improved.

[0033]

According to the present invention, the structure of the restricted passage constituting member, in particular, the shape structure of the peripheral portions of the contact frame member and the partition wall member is improved, the durability of the diaphragm is remarkably improved, and the contact frame is also improved. It is possible to provide a liquid-filled type vibration damping device that can reduce the cost of a method for joining a member and a partition member.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a liquid filled type vibration damping device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a partition wall member and a contact frame member.

FIG. 3 is a vertical sectional view of a conventional liquid-filled type vibration damping device.

[Explanation of symbols]

 10 Vibration Isolator 11 Base Plate 12 Mounting Bolt 13 Air Chamber 14 Diaphragm 15 Sub-Liquid Chamber 16 Abutting Frame Member 17 Partition Member 18 Limiting Passage 19 Elastic Body 20 Pressure-receiving Liquid Chamber 21 Outer Frame 22 Outer Frame Flange 23 Connecting plate 24 Mounting bolt 25 Metal fitting 26 Angular cut end of metal plate 27 Partition part 28 Partition part tube part 29 Partition part flange part 30 Abutting frame member part part 31 Baffle wall 32 Opening part 33 Opening part 34 Flange part of the frame member

Claims (1)

[Claims] 1. A connecting member connected to one of the vibration generating portion or the vibration receiving portion, a tubular frame member connected to the other of the vibration generating portion or the vibration receiving portion, the connecting member and the frame member. An elastic body that is disposed between and is deformable when vibration occurs,
A liquid chamber provided in the frame member, a partition member for partitioning the liquid chamber, a pressure receiving liquid chamber capable of expanding and contracting the partition member and the elastic body as a part of the partition, and incorporated inside the partition member. And a sub-liquid chamber communicating with the pressure-receiving liquid chamber via a restriction passage provided in the partition member, and the sub-frame between the contact frame member and the contact frame member. A diaphragm that constitutes a liquid chamber and is capable of expanding and contracting the auxiliary liquid chamber; and a lid member that holds the peripheral edge portions of the partition wall member and the contact frame member together with the peripheral edge portion of the diaphragm by connecting with the frame member. A vibration-damping device including a liquid-filled vibration-damping device, characterized in that the peripheral edge of the contact frame member is folded back toward the connecting member to enclose the peripheral edge of the partition member.