JPH0771510A - Fluid charged vibrationproofing device - Google Patents

Abstract

PURPOSE:To drastically reduce time for fitting parts together, storing parts, etc., in the case of a fluid charged vibrationproofing device suitable for engine mount and the like by forming an auxiliary fluid room outside a thin rubber wall and making it possible to form not only a vibrationproofing rubber body but also the thin rubber wall by injection molding of a rubber material. CONSTITUTION:A vibrationproofing rubber body 2 is formed by injection molding of a rubber material on the upper half of the inner space in a cylindric insert plate 1 and an inner cylinder 3 is pierced into and embedded in the center near the bottom wall of the vibrationproofing rubber body 2 which has a recessed part 21 formed in the center leading from the outside circumference to near the inner cylinder 3 leaving the wall on both sides and a main fluid room A is formed by pressing in and fixing an insert plate 1, which has an opening 11 provided in the position corresponding to the recessed part 21, into an outer cylinder 4. A cave-in part 12 provided in the center of the insert plate 1 has auxiliary fluid rooms B, C partitioned therein by partitioning thin rubber walls 51, 52. The insert plate 1 also has a grooves 53 formed in the center of its outer circumference and the grooves 53, which becomes a cross section, is caused to function as a throttle passage F communicating with fluid rooms A, B, C with the insert plate 1 closed in the inserted state intake the outer cylinder 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled vibration damping device,
Particularly, the present invention relates to a structural improvement of a tubular liquid-filled vibration isolator in which a vibration-proof rubber body having a liquid chamber is arranged between inner and outer double cylinders.

[0002]

2. Description of the Related Art A cylindrical vibration damping device has been proposed as a liquid filled vibration damping device that exhibits a good vibration damping action in a compact shape and is suitable for use in engine mounts and the like. 6 shows.

In the figure, an anti-vibration rubber body 2 is joined in the upper half of a cylindrical insert plate 1 which is press-fitted in an outer cylinder 4, and an inner cylinder 3 for connecting and supporting the vibrating body is penetratingly embedded near the bottom wall thereof. I am doing it. The anti-vibration rubber body 2 is formed into a main liquid chamber A by leaving the front and rear (vertical direction in the plane of the drawing) side walls and recessing the central portion thereof from the outer peripheral surface of the upper half to a position closer to the inner cylinder 3. The insert plate 1 is recessed at the center of the outer periphery of the entire circumference, and a ring-shaped throttle member 71 is disposed in this portion, and an opening formed in the throttle member 71 is provided in the lower half of the insert plate 1 which is further recessed. The outer periphery of the thin rubber wall 72 is sandwiched between the opening edges of the above, a sub liquid chamber B is formed above it, and an air chamber D is below.

The main liquid chamber A and the sub liquid chamber B are communicated with each other by a throttle channel F formed in the throttle member 71.
In the main liquid chamber A, a stopper member 73 having a similar shape to this is formed.
However, cushioning rubber plates 74 are arranged below the bottom wall of the vibration-proof rubber body 2 through which the inner cylinder 3 penetrates.

When vibration is input and the vibration-proof rubber body 2 is deformed, the enclosed liquid flows between the main liquid chamber A and the sub-liquid chamber B through the throttle channel F, and a large vibration damping force is generated.

[0006]

In such a conventional liquid filled vibration damping device, the thin rubber wall 72 is manufactured separately from the vibration damping rubber body 2, and is sandwiched between the diaphragm member 71 and the outer cylinder 4 in the liquid. After wearing
The liquid accumulated in the air chamber D is drained from a pair of left and right through holes 41, 42 provided in the outer cylinder 4. As a result, it takes time and labor to manufacture the thin rubber wall 72 such as storage and assembly, draining, and the like, resulting in high cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid-filled anti-vibration device that is simple and inexpensive to manufacture.

[0008]

To explain the structure of the present invention, a rubber material is injection-molded in the upper half of the inner space of a cylindrical insert plate 1 to form a vibration-proof rubber body 2. An inner cylinder 3 is embedded in a central portion near the bottom wall of the body 2, and a recess 21 extending from the outer periphery to the inner cylinder 3 is formed in the center of the anti-vibration rubber body 2 leaving both side walls. The insert plate 1 having the opening 11 at a position corresponding to the recess 21 is attached to the outer cylinder 4
The main liquid chamber A is formed in a state of being press-fitted therein, and the insert plate 1 is formed such that the center of the plate surface of the lower half portion is recessed with respect to the inner cylinder 3 at a predetermined interval, A thin rubber wall 5 is formed by injection-molding a rubber material in the recessed part 12 and opens outward with a predetermined distance from the bottom wall of the recessed part 12.
1, 52 are defined to form the insert plate 1 and the outer cylinder 4
The thin rubber wall 5 is secured between the outer cylinder 4 and the inner cylinder while being press-fitted and fixed.
Sub-liquid chambers B and C having chamber walls 1, 52 are formed, and a groove portion 53 is formed at the center of the outer periphery of the insert plate 1, and the insert plate 1 is closed while being press-fitted and fixed in the outer cylinder 4. The groove 53, which is a cross section, serves as a throttle flow passage F that connects the main liquid chamber A and the sub liquid chambers B and C.

[0009]

In the above structure, since the auxiliary liquid chamber B is formed outside the thin rubber walls 51, 52, not only the vibration isolating rubber body 2 constituting the main liquid chamber A but also the thin rubber Wall 51,
52 can also be formed by injection molding of a rubber material prior to press-fitting the insert plate 1 in the liquid. Therefore, as compared with the conventional case where the thin-walled rubber wall 5 is manufactured separately and assembled in liquid, the labor for assembling, storing parts, etc. is significantly reduced.

Further, the vibration-proof rubber body 2 and the thin-walled rubber walls 51, 5
By simply press-fitting the insert plate 1 formed with 2 into the outer cylinder 4 in the liquid, the main liquid chamber A, the sub liquid chamber B, and the throttle channel F connecting these are formed, and no labor such as draining is required. Is.

Further, since the thin rubber walls 51, 52 are provided in the recess 12 of the insert plate 1 and are separated from the inner cylinder 3, the inner cylinder 3 which moves up and down by the vibration input becomes the thin rubber walls 51, 52. There is no problem of collisions and fatigue. Then, the thin rubber walls 51 and 52 are formed in the recess 12
Since it is arranged at a predetermined distance from the bottom wall of the above, the expansion deformation due to the liquid inflow from the main liquid chamber A is regulated by abutting against the bottom wall 12, and the durability is deteriorated due to the excessive deformation. Does not happen.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall side view of a liquid filled vibration damping device, FIG. 2 shows its longitudinal section, and FIG. 3 shows its transverse section. In FIG. 1, a cylindrical insert plate 1 is press-fitted and fixed in an outer cylinder 4 which is press-fitted and fixed in a holder (not shown), and an anti-vibration rubber is provided in an upper half portion of the cylindrical space of the insert plate 1. The body 2 is injection molded. An inner cylinder 3 for connecting and supporting the vibrating body is embedded in the center of the vibration-proof rubber body 2 near the bottom wall protruding downward in a mountain shape (FIG. 2).

The anti-vibration rubber body 2 has a recess 21 whose central portion extends from the outer periphery to the vicinity of the inner cylinder 3 while leaving front and rear (left and right in FIG. 2) side walls.
The recess 21 faces the opening 11 provided in the peripheral surface of the insert plate 1. Then, when the insert plate 1 is press-fitted into the outer cylinder 4 in the liquid, the recess 21 is closed to become the main liquid chamber A. A resin stopper member 73 having a substantially similar shape (FIG. 3) is inserted in the main liquid chamber A.

The insert plate 1 is recessed in the central portion in the width direction of the outer circumference to form a space between the insert plate 1 and the outer cylinder 4 (FIG. 3). Has become. The recessed portion 12 is curved along the bottom surface of the anti-vibration rubber body 2 and faces the inner cylinder 3 at a predetermined interval via a space 63.

A rubber material is injected into the recessed central portion of the outer periphery of the insert plate 1 to form a rubber layer 5, and the thickened rubber layer 5 in the recessed portion in the lower half is located at the left and right positions in FIG. Recesses 54 that open outwards, leaving the walls 51, 52,
55 is formed. Behind these rubber walls 51 and 52, one is an elongated hole 61 penetrating in the width direction (the direction perpendicular to the paper surface), and the other is an elongated recess 62 defined by a partition formed at the center in the width direction. ing. The right recess 55 is divided by the partition wall to form a pair in the width direction (in FIG. 3, only one is shown by a broken line).

The rubber layer 5 also has a groove portion 53 having a rectangular cross section (FIG. 2) at the center of the outer periphery thereof and a portion 58 (FIG. 3) in the circumferential direction.
It is formed except for the above, and this extends from the recess 21 forming the main liquid chamber A to the recess 54. From this recess 54, large-diameter grooves 56 and 57 (FIG. 2) having a substantially U-shaped cross section extend from two positions in the width direction in the circumferential direction across the groove 53 to reach the respective recesses 55. When the insert plate 1 is press-fitted into the outer cylinder 4 in the liquid, the recess 54
Is closed to become the sub-liquid chamber B, and the above-mentioned recesses 55
Is a sub-liquid chamber C that is substantially integrated with the sub-liquid chamber B by the flow path through which the sealing liquid is formed, which is formed by closing the groove portions 56 and 57. At the same time, the closed groove portion 53 has a closed cross section and serves as a throttle channel F connecting the main liquid chamber A and the sub liquid chamber B.

However, when the inner cylinder 3 moves up and down due to the vibration input, the internal pressure of the main liquid chamber A increases and decreases, and the enclosed liquid flows into the sub liquid chamber B through the throttle flow passage F, so that a large vibration damping force is exerted. Occurs. At this time, the excessive movement of the inner cylinder 3 causes the stopper member 7 to move.
3 is abutted and regulated, while downward movement is abutted and regulated in the recess 12 of the insert plate 1. Therefore, the inner cylinder 3 does not come into direct contact with the thin rubber walls 51, 52, and the deterioration of durability due to the abrasion thereof is prevented.

Further, the thin rubber walls 51, 5 at the time of liquid inflow
The expansion deformation of No. 2 is regulated by reducing and eliminating the punched hole 61 or the concave portion 62 and bringing the thin rubber walls 51 and 52 into contact with the bottom wall of the concave portion 12. Thus, excessive deformation is prevented, and this also prevents deterioration of the durability of the thin rubber walls 51, 52. As a result of preventing the deterioration of durability in this way, the same natural rubber as that of the vibration-proof rubber body 2 can be used as the rubber material of the thin rubber walls 51, 52, and simultaneous injection molding becomes easy.

Here, FIG. 4 shows a side view with the outer cylinder 4 removed. The rubber layer 5 formed on the outer periphery of the insert plate 1 is provided with seal ribs 59 along the entire periphery along both side edges (only one is shown), and a part 58 thereof not forming the groove portion 53 has Seal rib 5
Parallel seal ribs 5 extending in the width direction with a space between them 9
81 and 582 are formed.

As shown in FIG. 5, the insert plate 1 is formed by roll-forming a plate material and then welding and connecting the abutting ends 13 into a tubular shape, which is press-formed into a predetermined shape.
The rubber material is injection-molded by positioning in the mold by the notches 14 provided on both side edges of the abutting end 13. Thereby, the abutting end 13 of the insert plate 1 is accurately positioned in the space surrounded by the seal ribs 581 and 582 of the rubber layer 5 (FIG. 4). Since the bead rises at the welded butt end 13, the surface pressure of the seal rib 59 in contact with the outer cylinder 4 changes at this portion, the sealing performance deteriorates, and air enters the main liquid chamber A that has become a negative pressure. However, this is surely prevented by the seal ribs 581 and 582 provided in the width direction.

Thus, since the insert plate 1 can be formed from a plate material, the cost can be reduced as compared with the case where a pipe material is used. If the positioning of the insert plate 1 in the mold is performed at the edge of the opening 11 of the insert plate 1 instead of at the notch 14, the notch 1
It is not necessary to provide 4.

[0022]

As described above, according to the liquid filled vibration damping device of the present invention, the vibration damping rubber body and the thin rubber wall can be simultaneously injection-molded on the insert plate in advance by using the same kind of rubber material. At the same time, the main liquid chamber, the sub-liquid chamber, and the throttle channel connecting these are formed only by press-fitting such an insert plate into the outer cylinder in the liquid, which significantly reduces the time and cost of assembly and manufacturing. be able to.

[Brief description of drawings]

FIG. 1 is an overall front view of a liquid filled vibration damping device of the present invention.

FIG. 2 is an overall vertical cross-sectional view of the liquid-filled vibration damping device taken along the line II-II in FIG.

3 is an overall cross-sectional view of the liquid-filled vibration isolator taken along line III-III in FIG.

FIG. 4 is a side view of a half portion after the rubber material is injection-molded, as seen from the X direction in FIG.

FIG. 5 is an overall side view of an insert plate before press molding.

FIG. 6 is an overall cross-sectional view of a conventional liquid filled vibration damping device.

[Explanation of reference symbols] 1 insert plate 11 opening 2 anti-vibration rubber body 21 recess 3 inner cylinder 4 outer cylinder 51, 52 thin rubber wall 53 groove part A main liquid chamber B, C sub liquid chamber F throttle channel

Claims (1)

[Claims] 1. A rubber material is injection-molded into an upper half of an inner space of a cylindrical insert plate to form a vibration-proof rubber body, and an inner cylinder is embedded in a central portion near the bottom wall of the vibration-proof rubber body. In addition, the anti-vibration rubber body is formed with a recess extending from the outer circumference to the vicinity of the inner cylinder in the center while leaving both side walls, and the insert plate having an opening at a position corresponding to the recess is provided in the outer cylinder. The main plate is formed so as to form a main liquid chamber in a state of being press-fitted in, and the insert plate is formed such that the center of the plate surface of the lower half portion is recessed at a predetermined interval with respect to the inner cylinder, and Is injection-molded with a rubber material to form a thin rubber wall that opens outward with a predetermined distance from the bottom wall of the recessed portion, and the insert plate is press-fitted into the outer cylinder and fixed between it and the outer cylinder. A sub-liquid chamber with a thin rubber wall as the chamber wall is formed, and a groove is formed in the center of the outer periphery of the insert plate. And a vibration sealing device for liquid filling, wherein the groove portion having a closed cross section in a state in which the insert plate is press-fitted and fixed in the outer cylinder is formed as a throttle flow passage communicating the main liquid chamber and the sub liquid chamber. .