JPH11280829A - Liquid-filled vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a diaphragm member or the like to a cylindrical bottom fixture for a liquid-filled vibration isolator at a low cost. SOLUTION: A conical surface slope which is expanded radially outward from a circular opening to one end side of a cylindrical bottom fixture, is provided on the other end side of the cylindrical bottom fixture, and is provided at its inner peripheral surface with a rubber elastic material thin wall part. A cylindrical bottom wall member 40 is inserted in the slope through the intermediary of the thin wall part so as to block the opening. A cylindrical rubber elastic member 21 vulcanized and bonded is provided on the one end side of the bottom fixture, surrounding the opening so as to block the latter. The rubber elastic member is fixed thereto with an attaching fixture 31. The bottom fixture, the rubber elastic member and the bottom wall member define a liquid chamber K surrounding thereby and charged therein with liquid for absorbing vibration. Further, a second cylindrical part 44 of the bottom wall member is enlarged so as to fix the bottom wall member to the slope of the bottom fixture.

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 used for an engine mount of a vehicle or the like.

[0002]

2. Description of the Related Art Conventionally, this type of liquid-filled type vibration damping device is
A cylindrical rubber elastic body is connected to one end of the cylindrical first metal fitting to close an opening at one end, and a second elastic member coaxially fixed to the first metal fitting is provided at the bottom of the rubber elastic material. Has metal fittings. The first metal fitting is provided with a thin rubber elastic body covering portion following the rubber elastic body on the inner peripheral surface, and the orifice member and the diaphragm member, which are the bottom wall members, are arranged in order from the inside in the axial direction on the other inner peripheral surface. It is attached, closes the opening at the other end, and seals the liquid chamber E disposed between the rubber chamber and the rubber elastic body. Then, the mounting member is attached to the other end side of the cylindrical metal member, and both members are fixed to the first metal member by caulking the orifice member and the diaphragm member.

[0003]

However, in the above-described liquid-filled type vibration damping device, a fitting for fixing the orifice member and the diaphragm member to the first fitting is separately required, and the fitting is attached to the first fitting. Since the mounting work is also required, there is a problem that the component cost and the manufacturing cost increase, and the product cost increases. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a liquid-filled type vibration damping device capable of fixing a diaphragm member or the like to a cylindrical first metal fitting at low cost.

[0004]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to the first aspect is characterized in that a first metal fitting having a cylindrical or annular shape is provided with a first metal fitting. An inner peripheral surface of the metal fitting is provided with a conical inclined portion which is radially outwardly extended from the circular first opening toward the other end of the first metal fitting, and a thin rubber is provided on the inner peripheral surface of the inclined portion. An elastic body covering portion is provided, a bottom wall member having a cylindrical outer metal fitting on the inclined portion is inserted through the rubber elastic body covering portion, the first opening is closed, and the other end of the first metal fitting is provided. The second opening is closed by providing a rubber elastic body that is vulcanized and bonded around the second opening of the first metal fitting and a second metal fitting fixed to the rubber elastic body,
What is claimed is: 1. A liquid-filled type vibration damping device comprising: a first metal fitting, a bottom wall member, and a vibration-absorbing liquid chamber filled with a liquid, which is surrounded by a rubber elastic body. The pipe is expanded and the bottom wall member is fixed to the inclined portion of the first metal fitting. The bottom wall member includes a diaphragm member, an orifice member, and the like.

[0005] In the invention according to claim 1 configured as described above, the bottom wall member is easily inserted by inserting the bottom wall member from the first opening of the first metal fitting into the inclined portion and expanding the outer metal fitting. Can be fixed to the inclined portion. Thereby, while the bottom wall member is firmly fixed to the first metal fitting,
The first opening can be liquid-tightly covered by the thin rubber elastic body covering portion for sealing.

As a result, according to the first aspect of the present invention, there is no need for a mounting member which is a separate member for fixing the bottom wall member to the first metal member, and a step for mounting the mounting metal member to the first metal member. Is also unnecessary, so that the product price can be reduced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show a front view, a plan view and a side view of a liquid-filled type vibration damping device according to the embodiment. And a sectional view. The liquid-filled type vibration damping device includes a vulcanized molded product main body 10 which is a rubber vulcanized molded product, and a bottom wall member 40 attached to the bottom side (the lower side in the figure) of the vulcanized molded product main body 10.

As shown in FIG. 5, the vulcanized molded article main body 10 has a bottom metal fitting 11 as a first metal fitting.
Is formed in a substantially cross shape by punching and bending a thick metal plate, and the center of the cross is a bulging portion 14 slightly bulging circularly upward (upward in the figure). A circular opening (first opening) 15 is provided at a concentric position near the outer periphery of the bulging portion 14. A pair of projecting portions 12 on one side of the cross shape of the bottom fitting 11 have a pair of mounting holes 12a and 12b provided at a center line position, with a longitudinal end projecting outward in a substantially triangular shape. Positioning projection 12c protruding to the back side on one side in the width direction with respect to the line
Is provided. A pair of protrusions 13 on the other side orthogonal to the protrusions 12 are provided with stoppers 13a which are bent at right angles to the front side at intermediate positions in the longitudinal direction, and at the center line positions, the stoppers 13a extend upward. A bulged rib 13b is provided. As shown in detail in FIG. 6, the inner peripheral surface of the bottom fitting 11 is a conical inclined portion 16 that extends radially outward from the opening 15 upward.

A cylindrical rubber elastic body 21 is provided around the opening (second opening) 17 on the upper surface side of the bottom metal fitting 11 by vulcanization bonding so as to close the opening 17. The rubber elastic body 21 is provided with a cylindrical portion 22 and a flat plate portion 23 for closing the upper end of the cylindrical portion 22. The inner diameter of the cylindrical portion 22 is substantially the same as the inner diameter of the opening 15. The lower end portion is a thin portion 22 a that covers the inner peripheral surface of the inclined portion 16. Further, from the cylindrical portion 22, there is provided a protective elastic body portion 25 which covers the stopper portion 13a via a connecting portion 24 which covers the surface of the rib 13b of the projecting portion 13.
A ring fitting 26 for reinforcing the cylindrical portion 22 is embedded at an intermediate position in the vertical direction of the cylindrical portion 22 so as to protrude from the outer periphery.

On the upper surface of the flat plate portion 23, a mounting fitting 31 as a second fitting is fixed. The mounting bracket 31 is a disk-shaped, rectangular flat portion 32 bulging upward in the center.
, And a flange 33 therearound. At the center of the flat portion 32, a mounting hole 32a is provided.
A bolt 34 is attached to 2a with its head down, and a screw portion is fixedly protruding from the upper surface. Mounting holes 32
a mounting hole 32b is provided on the opposite side of the centering line with respect to the positioning projection 12c, a positioning pin 35 is inserted into the mounting hole 32b with the head down, and the trunk is an upper surface. And is fixed.

As shown in FIGS. 7 and 8, the bottom wall member 40 is composed of a cylindrical diaphragm fitting 41 and an orifice member 51 inserted into the diaphragm fitting 41. As shown in FIGS. 9 and 10, the diaphragm fitting 41 has a first cylindrical portion 42 and a slightly smaller portion than the first cylindrical portion 42 with a step 43 provided near one end in the axial direction (near the lower end in the drawing) as a boundary. A second cylindrical portion 44 having a large diameter and a flange portion 45 protruding outward at an end of the second cylindrical portion 44 are provided coaxially. At the end of the first cylindrical portion 42, locking pieces 42a protruding in the axial direction are integrally provided at three places arranged at equal intervals in the circumferential direction. A thin rubber portion 46 is vulcanized and bonded to the inner peripheral surface of the first cylindrical portion 42, and expands from the position corresponding to the step portion 43 of the rubber portion 46 to the vicinity of the tip of the first cylindrical portion 42 integrally with the rubber portion 46. An exposed thin-walled bottomed diaphragm membrane 47 is provided.

The orifice member 51 is a cylindrical member made of resin, and has a flange portion 53 slightly protruding in the radial direction on the outer periphery of one end side of the cylindrical portion 52 as shown in FIGS. A passage groove 54 forming an orifice passage is provided on the outer peripheral surface of the portion 52. An opening 54 a of a passage groove 54 is provided in the flange portion 53, and an opening 54 b is provided at the other end of the passage groove 54 on an end surface of the cylindrical portion 52. The flange 54 is provided with locking recesses 55 cut out at three locations at equal intervals in the circumferential direction. A thick diaphragm portion 56 is vulcanized and bonded to the inner peripheral surface of the cylindrical portion 52 at a position near the flange portion 53. Diaphragm part 5
Numeral 6 is provided to lower the spring constant in a higher frequency range than the orifice passage.

[0013] The orifice member 51
It is inserted into the first cylindrical portion 42 side of the diaphragm fitting 41 from the opposite end side of the flange portion 53, and is positioned by the flange portion 53 hitting the tip of the first cylindrical portion 42. Furthermore, the orifice member 51 is positioned and fixed to the diaphragm fitting 41 by bending and locking the locking piece 42a of the diaphragm fitting 41 into the locking recess 55 of the flange portion 53, as shown in FIGS. Bottom wall member 40
Formed.

Further, the bottom wall member 40 is inserted into the vulcanized molded product main body 10 from the side of the bottom fitting 11 in the liquid, and the flange 45 contacts the rear surface of the bulging portion 14 of the bottom fitting 11 to position the insertion. Is performed. By expanding the second cylindrical portion 44 in this state, the second cylindrical portion 44 is expanded in diameter and deformed along the inclined portion 16 as shown in FIG. 16 is pressed tightly. Thereby, the bottom wall member 40 is firmly fixed to the bottom metal fitting 11, and the opening 15 can be closed in a liquid-tight manner by using the thin portion 22a as a seal portion, and the liquid chamber K is formed inside the liquid sealing type protection. A vibration device is obtained.

This liquid filled type vibration damping device has a bottom fitting 11
Is the mounting hole 12 on the body side (or engine side) of the vehicle.
It is fixed by bolting via a and 12b, and is fixed to a bracket on the engine side (or body side) by bolts 34 of the mounting bracket 31. for that reason,
According to the above-described embodiment, a mounting member which is a separate member for fixing the bottom wall member 40 to the bottom metal member 11 is not required, and a step for mounting the mounting metal member to the first metal member is not required. Can be inexpensive.

The specific external shape and the like of the liquid-filled type vibration damping device of the present invention are not limited to those shown in the above embodiment, and the bottom metal fitting is not a ring but a cylindrical type. As a result, the shapes of the rubber elastic body 21 and the mounting bracket 31 are also changed. Further, the shape of the bottom wall member and the like is not limited to the shape shown in the embodiment.

[Brief description of the drawings]

FIG. 1 is a front view showing a liquid filled type vibration damping device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the liquid-filled type vibration damping device.

FIG. 3 is a side view showing the liquid-filled type vibration damping device.

FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 2;

FIG. 5 is a sectional view showing a vulcanized molded product main body.

FIG. 6 is a sectional view showing a main part of a vulcanized molded product main body.

FIG. 7 is a plan view showing a bottom wall member.

8 is a sectional view taken along line VIII-VIII shown in FIG.

FIG. 9 is a plan view showing a diaphragm fitting.

FIG. 10 is a sectional view taken along line XX shown in FIG. 9;

FIG. 11 is a plan view showing an orifice member.

12 is a sectional view taken along line XII-XII shown in FIG.

FIG. 13 is a left side view showing the orifice member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Vulcanized molded product main body, 11 ... Bottom metal fitting, 13a ... Stopper part, 15 ... Opening part, 16 ... Inclined part, 21 ... Rubber elastic body, 22 ... Cylindrical part, 22a ... Thin part, 23 ... Flat part, 3
DESCRIPTION OF SYMBOLS 1 ... Mounting bracket, 34 ... Bolt, 40 ... Bottom wall member, 41 ...
Diaphragm metal fittings, 42... First cylindrical part, 43.
... Second cylinder part, 45 ... Flange part, 47 ... Diaphragm film, 51 ... Orifice member, 52 ... Cylinder part, 53 ... Flange part, 54 ... Path groove, 54a, 54b ... Opening.

Claims (1)

[Claims] 1. One end of a cylindrical or annular first metal fitting,
An inner peripheral surface of the first metal fitting is provided with a conical inclined part that is radially outwardly expanded from the circular first opening toward the other end of the first metal fitting, and an inner circumference of the inclined part is provided. A thin rubber elastic body covering portion is provided on the surface, and a bottom wall member having a cylindrical outer metal fitting is inserted into the inclined portion via the rubber elastic body covering portion to close the first opening, The other end side of the first metal fitting surrounds the second opening of the first metal fitting and has a rubber elastic body bonded and vulcanized and a second metal fitting fixed to the rubber elastic body to provide the second opening. Wherein a liquid chamber for absorbing vibration filled with a liquid is provided in an area surrounded by the first fitting, the bottom wall member, and the rubber elastic body. A liquid seal, wherein an outer fitting of a wall member is expanded and the bottom wall member is fixed to an inclined portion of the first fitting. Shikibofu apparatus.