JPH10227328A - Liquid sealed type mount and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curtail the number of part items and make an assembling work easy by arranging the inner circumferential part of a diaphragm oppositely to an idle orifice through an inner circumference supporting ring fitted to the face on the opposite side to a liquid chamber on a partition wall. SOLUTION: In a diaphragm 7, when large displacement due to a shock is input to the main body part 7b surrounding a liquid chamber B on the outer circumferential side of a fitting part to the engaging step difference part 83 of an idle orifice D through an inner circumference supporting ring 72, sealed liquid L moves through a shock orifice C. Meanwhile, the inner circumferential part 7c facing to a liquid chamber A through the orifice D allows liquid column resonance at inputting vibration of small amplitude due to idling. Apart from a main body vulcanized molding constituted of an outer cylinder 1, a center boss 4, and an elastic body, three members, namely, a partition wall 8, the diaphragm 7, and a cup member 2 are temporarily assembled, and after excluding air from the respective inner spaces in a liquid tank, the sealed liquid L is enclosed and both are combined together. Hereby, a caulking work outside the tank is facilitated, and hence air extraction and liquid charge can be surely performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid-filled mount used as an anti-vibration support means of, for example, an engine of an automobile, and a method of assembling the mount.

[0002]

2. Description of the Related Art A liquid-filled mount for elastically supporting an engine on a vehicle body frame generally includes an elastic body integrally provided between an outer cylinder and a center boss, and a seal sealed on an inner periphery of the outer cylinder. A pair of upper and lower liquid chambers in which liquid is sealed are formed between the attached diaphragm and the upper and lower liquid chambers. The liquid chambers communicate with each other through an orifice flow path, and the pressure fluctuation of the liquid chamber on the elastic body side is within a predetermined fluctuation range. It has a structure in which a sub-diaphragm that absorbs light is provided. That is, when a large displacement is input due to a shock such as a bouncing of a vehicle body, the elastic body undergoes a large deformation, so that the filled liquid flows between the liquid chamber on the elastic body side and the liquid chamber on the diaphragm side. , And a large damping force is obtained by the flow resistance in the orifice passage at this time. Also, for a small amplitude vibration input due to engine vibration or the like during idling, the pressure fluctuation of the filled liquid is absorbed by the resonance movement of the sub-diaphragm, and the filled liquid hardly passes through the orifice flow path, and the dynamic spring constant And exhibits excellent vibration insulation properties (for example, see Japanese Utility Model Laid-Open No. 6-78644).

[0003]

However, the conventional liquid-filled mount has a vulcanized main body formed by integrally vulcanizing an elastic body made of an elastomer between an outer cylinder and a center boss. A diaphragm, a partition formed of a plurality of components defining an orifice flow path by defining a space between the vulcanized molded product and the diaphragm in two chambers, a sub-diaphragm held by the partition, and the diaphragm There is a problem that a cup member is provided to cover the outside of the device, and the number of parts is large.

[0004] This type of liquid-enclosed mount is assembled in a liquid chamber because it is necessary to enclose a hydraulic fluid in a liquid chamber. When the mount is set in a caulking device in the liquid, the mount is formed by assembly. In order to prevent air from being mixed into the liquid chamber, air must be vented by manually tilting the vulcanized main body, the partition walls and the diaphragm in the liquid. In addition, there is a problem that the four-part group of the vulcanized main body, the diaphragm, the partition holding the sub-diaphragm, and the cup member must be handled in a liquid, and the workability of assembly is poor.

The present invention has been made in view of the above circumstances, and the technical problem thereof is that the number of parts is reduced and the required vibration damping force and vibration insulation performance are obtained with a simple structure. An object of the present invention is to provide a liquid-filled mount that can be used and to facilitate its assembly.

[0006]

According to the present invention, there is provided a liquid-filled mount, comprising: an elastic body integrally provided between an outer cylinder and a center boss;
A diaphragm made of an elastomer that is displaceably sealed to the inner periphery of the outer cylinder, and an outer periphery fixed between the outer cylinder and the first liquid chamber on the elastic body side and the second liquid chamber on the diaphragm side. A partition wall, comprising a cup member arranged so as to cover the diaphragm from the outside and having an outer periphery fixed to the outer cylinder and closely fitted to the outer periphery of the diaphragm,
A shock orifice communicating between the two liquid chambers is formed between the partition and an outer peripheral portion of the diaphragm closely contacted with the partition, and an idle orifice having a smaller flow resistance than the shock orifice is opened in the partition, An inner peripheral portion of the diaphragm is disposed to face the idle orifice via an inner peripheral support ring fitted on a surface of the partition wall opposite to the first liquid chamber.

According to the above construction, the diaphragm surrounds the second liquid chamber on the outer peripheral side of the inner peripheral support ring fitted to the partition, and at the outer peripheral side, when a large displacement in a low frequency range is input. The diaphragm has the original function of allowing the sealed liquid to move through the shock orifice between the first liquid chamber and the second liquid chamber. Further, the inner peripheral portion of the diaphragm is arranged to face the idle orifice by the inner peripheral support ring so as to close the idle orifice. When the inner peripheral portion receives a small amplitude vibration due to engine vibration or the like at the time of idling, The same effect as the conventional sub-diaphragm that allows the liquid column resonance of the filled liquid in the one liquid chamber to pass through the idle orifice having a smaller flow resistance than the shock orifice and lowers the dynamic spring constant.

More preferably, the cup member has a support cylinder, and an inner peripheral support ring of a diaphragm fitted to a surface of the partition wall opposite to the first liquid chamber is supported by the support cylinder. So that With this configuration, the fitted state between the inner peripheral support ring and the partition wall is reliably maintained.

In assembling the liquid-filled mount, the diaphragm has an inner peripheral support ring and an outer peripheral support ring integrated at the time of molding on the inner peripheral part and the outer peripheral part thereof. The inner peripheral support ring is fitted to the inner peripheral surface of the fitting step formed toward the one liquid chamber side, and the outer peripheral support ring is fitted to the outer peripheral portion of the cup member, thereby temporarily assembling each other. The outer peripheral portions of the partition wall, the diaphragm and the cup member are caulked and fixed in a liquid to an outer cylinder in which the elastic support and the center boss are integrated.
According to this method, since the partition, the diaphragm, and the cup member are preliminarily assembled, in assembly in a liquid, the outer cylinder in which the elastic support and the center boss are integrated, the partition, the diaphragm and the Only the work of caulking the temporary assembly of the cup member is performed.

In particular, in the case where the inner peripheral support ring of the diaphragm is supported by the support cylindrical portion of the cup member, the interference between the fitting step of the partition and the inner peripheral support ring is reduced in the above-mentioned temporary assembly work. Then, it can be easily press-fitted by hand.

More preferably, in the above-mentioned assembling method, the partition has a plurality of openings in the circumferential direction in advance along the shock orifice, and the outer peripheral portions of the temporarily assembled partition, diaphragm and cup member are elastically fixed. When the body and the center boss are caulked and fixed in the liquid to the outer cylinder integrated with the outer cylinder, the opening located at a portion other than the open end of the shock orifice to the first liquid chamber is closed by the elastic body. To This makes it possible to easily perform the air bleeding operation when assembling in the liquid.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of a liquid-filled mount according to the present invention, wherein reference numeral 1 denotes an outer cylinder, and 2 denotes a lower part of the outer cylinder 1 which is integrated by caulking. The cup member 2 is connected to, for example, a vehicle body frame via a mounting bolt 3. Reference numeral 4 denotes a center boss arranged concentrically above the outer cylinder 1, and is connected to, for example, the engine side via mounting bolts 5 protruding from the upper surface. Between the center boss 4 and the outer cylinder 1, an elastic body 6 molded in an umbrella shape with an elastomer is vulcanized and bonded.

Reference numeral 7 denotes a diaphragm made of an elastomer, and a metal outer peripheral support ring 71 is embedded and integrated in the outer peripheral portion, and a metal inner peripheral support ring 72 is formed in the inner peripheral portion.
Are buried and integrated. Then, the outer peripheral support ring 71
The outer peripheral portion 7a of the diaphragm 7 reinforced by the above is pressed into the inner peripheral surface of the outer cylindrical portion 21 of the cup member 2 and is in a state of being in close contact therewith.

Reference numeral 8 is a partition wall made of a metal disk disposed above the diaphragm 7, and its outer peripheral flange portion 81 is made up of an outer peripheral flange portion 71a of an outer peripheral support ring 71 of the diaphragm 7 and a cup member below it. The outer peripheral flange 22 and the outer peripheral flange 22 are caulked and fixed to the lower caulking portion 1a of the outer cylinder 1. Thus, the sealed space in which the filling liquid L between the elastic body 6 and the diaphragm 7 is sealed is partitioned into a first liquid chamber A on the elastic body 6 side and a second liquid chamber B on the diaphragm 7 side.

Between the outer peripheral portion 7a of the diaphragm 7 reinforced by the embedding of the outer peripheral support ring 71 and the outer peripheral portion of the partition 8 closely contacted with the diaphragm 7, a substantially C-shape extends in the circumferential direction, and one end is formed by the partition. The shock orifice is opened to the first liquid chamber A through an opening 82 formed in the outer peripheral part of the diaphragm 8 and the other end is opened to the second liquid chamber B through a notch 73 formed in the outer peripheral part of the diaphragm 7. C is formed. The outer peripheral support ring 71 is formed in a substantially U shape so as to surround the inner wall surface of the shock orifice C. An idle orifice D having an opening area larger than the cross-sectional area of the passage of the shock orifice C is formed in the center of the partition 8.

The partition 8 has an annular fitting step 83 bent toward the first liquid chamber A on the outer peripheral side of the idle orifice D.
Having. The inner peripheral support ring 72 of the diaphragm 7 is fitted on the inner peripheral surface of the fitting step 83. For this reason, the second liquid chamber B is formed in an annular shape by the main body portion 7b of the diaphragm 7 that is bent in a fold shape on the outer peripheral side of the fitting portion between the fitting step portion 83 and the inner peripheral support ring 72. , And communicates with the first liquid chamber A via a thin and long shock orifice C on the outer peripheral side thereof.

A portion of the diaphragm 7 on the inner peripheral side of the inner peripheral support ring 72, that is, an inner peripheral portion 7c is arranged to oppose so as to close a space below the idle orifice D, and can be appropriately displaced in its thickness direction. In state. The inner peripheral portion 7c is appropriately thicker than the outer peripheral side, that is, the main body portion 7b forming the second liquid chamber B, and thereby a predetermined inertial mass is set. . In addition, a vent hole 23 is formed at the bottom of the cup member 2 so that the operation of the main body 7b and the inner peripheral portion 7c of the diaphragm 7 is not hindered.

In the liquid-filled mount according to the first embodiment, the outer cylinder 1 and the center boss 2 are repeated in the axial direction (vertical direction in FIG. 1) by vibration input between the body frame side and the engine side. And the elastic body 6 undergoes repeated deformation. When the input vibration is a displacement with a low frequency and a large amplitude due to a shock such as a bouncing of the vehicle body, the elastic body 6 is greatly deformed, and the first liquid chamber A accompanying this is deformed.
Due to the change in the volume of the liquid, the filled liquid L is changed to the shock orifice C.
The fluid flows between the first liquid chamber A and the second liquid chamber B from the side where the pressure is relatively high to the side where the pressure is relatively low. For this reason, in addition to the damping force due to the viscoelasticity of the elastic body 6 and the damping force due to the flow resistance when the filled liquid L flows through the thin and long shock orifice C, good shock absorbing performance against shock input is obtained and vibration is reduced. Stop by time.

When the input vibration is a continuous small-amplitude vibration displacement of medium / high frequency due to an idling operation of the engine or the like, the inner peripheral portion 7c of the diaphragm 7 having its periphery fixed by the inner peripheral support ring 72. Of the filled liquid L in the idle orifice D with the vibration displacement in the thickness direction of the
Of the liquid L in the first liquid chamber A due to vibration input is absorbed. On the other hand, since the liquid column resonance frequency at the shock orifice C is different from that of the idle orifice D, when the vibration is input in the frequency range during the idling operation, the filled liquid L due to liquid column resonance
No move. Since the idle orifice D causing liquid column resonance has a diameter sufficiently larger than that of the shock orifice C and a length corresponding to the plate thickness of the partition wall 8, the idle orifice D hardly attenuates. The constant is reduced, and the vibration insulation is improved.

That is, the diaphragm 7 has a main body portion 7b surrounding the second liquid chamber B on the outer peripheral side of the fitting portion of the idle orifice D with the fitting step portion 83 by the inner circumferential support ring 72.
However, when a large displacement due to a shock is input, the diaphragm L allows the filled liquid L to move through the shock orifice C, while the first liquid flows through the idle orifice D on the inner peripheral side of the fitting portion. The inner peripheral portion 7c facing the chamber A has the same function as a conventional sub-diaphragm that allows liquid column resonance in the idle orifice D when a small amplitude vibration is input in the frequency range due to idling. Therefore, there is no need to provide a sub-diaphragm as a separate member in addition to the diaphragm 7.

In the manufacture of the liquid-filled mount of the above embodiment, the metal parts such as the outer cylinder 1, the cup member 2, the center boss 4, and the partition 8 are manufactured, and the elastic body 6 is attached to the outer cylinder 1 and the center boss 4. The outer cylinder 1, the center boss 4, and the elastic body 6 are formed through a step of integrally vulcanizing and a step of vulcanizing and forming the diaphragm 7 in which the outer peripheral support ring 71 and the inner peripheral support ring 72 are embedded and integrated. Vulcanized main body 100, partition wall 8,
This is performed by assembling the diaphragm 7 and the cup member 2 in a liquid. In the present invention, prior to the assembly in the liquid, as shown in FIG. 2, the outer peripheral support ring 71 of the diaphragm 7 is press-fitted onto the inner peripheral surface of the outer cylindrical portion 21 of the cup member 2 outside the liquid in advance. At the same time, the inner peripheral support ring 72 of the diaphragm 7 is press-fitted onto the inner peripheral surface of a fitting step 82 formed on the outer peripheral side of the idle orifice D of the partition wall 8,
As a result, the three members of the partition wall 8, the diaphragm 7, and the cup member 2 are temporarily assembled to each other.

Next, a liquid for sealing is filled with the vulcanized molded body 100 composed of the outer cylinder 1, the center boss 4 and the elastic body 6, and the temporary assembly 200 of the partition 8, the diaphragm 7 and the cup member 2. Immersed in a tank (not shown). In the vulcanized main body 100, if the outer cylinder 1 is positioned upward in the liquid, the air in the space A 'which becomes the first liquid chamber A after assembly is discharged by buoyancy and the liquid (filled liquid) is discharged. L) is filled, and the temporary assembly 200 is immersed in the liquid such that the partition wall 8 is located on the upper side as shown in FIG. A liquid chamber B), a groove-shaped space C ′ on the outer peripheral side thereof (a space that becomes a shock orifice C after assembly), and a fitting step 8 of the partition 8.
The air is immediately discharged from the inner space E of 2 by buoyancy and is filled with the liquid (filled liquid L).

The outer peripheral portion of the temporary assembly 200, that is, the outer peripheral flange portion 22 of the cup member 2 and the diaphragm 7
The outer peripheral flange portion 71a of the outer peripheral support ring 71 and the outer peripheral flange portion 81 of the partition wall 8 are inserted in the liquid into the inner periphery of the caulking tube portion 1a 'of the outer tube 1 in the main vulcanized molded product 100. Since the cup member 2, the diaphragm 7, and the partition wall 8 are temporarily assembled, the work of inserting the caulking tube portion 1a 'in the liquid can be easily performed. Next, in this state, the caulking tubular portion 1a 'is bent inward by a caulking device (not shown) and caulked. Thereby, the temporary assembly 2
The outer cylinder 1 of the main body vulcanized molded product 100 with the outer peripheral flange portions 22, 71a, 81 of
The liquid-filled mount shown in FIG. 1 is assembled.

FIG. 3 shows a liquid-filled mount according to a second embodiment of the present invention. In this embodiment, a cylindrical support tube portion 24 protruding toward the partition wall 8 is formed integrally with the inner peripheral portion of the cup member 2.
The distal end portion 24a of the support tubular portion 24 supports the inner peripheral support ring 72 of the diaphragm 7 from below, and maintains the fitting state with the inner peripheral surface of the fitting step portion 82 of the partition 8. It is in. The inner periphery of the distal end portion 24a of the support tube portion 24 is formed as a circular opening 24b to open the lower space of the inner peripheral portion 7c of the diaphragm 7 to the atmosphere, so that the resonance operation of the inner peripheral portion 7c at the time of idle vibration input is performed. They are not disturbed. As shown in FIG. 4, the partition 8 has a plurality of (six in the illustrated example) openings 8 along the shock orifice C.
2a to 82f are provided at equal intervals in the circumferential direction, and one end of the shock orifice C (an end opposite to the end opened to the second liquid chamber B by the cutout 73) is provided.
Is opened to the first liquid chamber A through the notch 61 formed at one position in the circumferential direction on the lower end surface of the elastic body 6, and the other five openings 82b ~
82 f is closed by the lower end surface of the elastic body 6.

The other parts are different in the shape of the cup member 2 and the like due to the formation of the support cylinder 24, and the mounting bolts 3
Although there is a slight difference such as the number of items, it is basically similar to that of the first embodiment.

That is, according to the liquid-filled mount of this embodiment, at the time of assembling, as in the first embodiment, first, the outer peripheral portion 7a of the diaphragm 7 is firstly attached to the outer cylindrical portion 21 of the cup member 2. And the inner peripheral support ring 72 of the diaphragm 7 is press-fitted to the inner peripheral surface of a fitting step 82 formed on the outer peripheral side of the idle orifice D of the partition 8. , The partition 8, the diaphragm 7, and the cup member 2 are temporarily assembled to each other.
In this case, the interference between the outer cylindrical portion 21 of the cup member 2 and the outer periphery 7a of the diaphragm 7 and the interference between the fitting step 82 of the partition 8 and the inner peripheral support ring 72 are set relatively small. It is easy to press-fit by hand. This is because, in the assembled state shown in FIG. 3, the inner peripheral support ring 72 of the diaphragm 7 is
This is because it is not necessary to rely on the fitting force between the fitting step 82 and the inner peripheral surface.

Next, the main body vulcanized molded product of the outer cylinder 1, the center boss 4 and the elastic body 6, and the temporary assembly of the partition 8, the diaphragm 7 and the cup member 2 are manufactured by the method according to FIG. By caulking and fixing in the liquid, an assembly is made in the state shown in FIG. At this time, the partition 8 has a plurality of openings 82a to 82a.
Since 82f is opened, the filling of the filled liquid L into the space to be the second liquid chamber B or the shock orifice C after the assembly and the air bleeding are easily performed.

[0028]

According to the present invention, the following effects are realized. (1) The diaphragm is a sub-diaphragm that reduces the dynamic spring constant when a medium or high-frequency vibration such as idling vibration is input, along with the original function of the diaphragm that allows the filling liquid to move through the shock orifice when a low frequency large displacement is input. , The structure is simplified. (2) Prior to assembling in the liquid, the three members of the partition wall, the diaphragm and the cup member can be temporarily assembled to each other outside the liquid in advance. The work of caulking and integrating with the outer cylinder in which the support and the center boss are integrated becomes easy. (3) When the three members are immersed in the liquid, air bleeding and liquid filling are facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a liquid-filled mount according to the present invention.

FIG. 2 is an explanatory view showing an assembling process of the liquid-filled mount.

FIG. 3 is a sectional view showing a second embodiment of the liquid-filled mount according to the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Cup member 21 Outer cylinder part 22, 71a, 81 Outer flange part 23 Vent hole 24 Support cylinder part 3, 5 Mounting bolt 4 Center boss 6 Elastic body 7 Diaphragm 7a Outer part 7b Main part 7c Inner part 71 Outer peripheral support ring 72 Inner peripheral support ring 8 Partition 82, 82a to 82f Opening 83 Fitting step A A First liquid chamber B Second liquid chamber C Shock orifice D Idle orifice 100 Body vulcanized molded product 200 Temporary assembly

Claims (4)

[Claims] An elastic body (6) integrally formed between an outer cylinder (1) and a center boss (4) and made of an elastomer continuous in a circumferential direction, and an inner periphery of the outer cylinder (1). A diaphragm (7) made of an elastomer that is displaceably sealed to the outer cylinder (1), a first liquid chamber (A) on the elastic body (6) side fixed to the outer cylinder (1), and the diaphragm (7). A partition wall (8) for partitioning the second liquid chamber (B) from the side, and a diaphragm (7) arranged so as to cover the diaphragm (7) from the outside and having an outer periphery fixed to the outer cylinder (1) and the diaphragm (7). ), And a cup member (2) closely fitted to the outer periphery of the liquid chamber (2) between the partition wall (8) and the outer peripheral portion of the diaphragm (7) closely contacted with the partition wall (8). A, B)
A shock orifice (C) communicating between the shock orifices (C) is formed, an idle orifice (D) having a smaller flow resistance than the shock orifice (C) is opened in the partition wall (8), and an inner peripheral portion of the diaphragm (7) ( 7c) is disposed opposite to the idle orifice (D) via an inner peripheral support ring (72) fitted to a surface of the partition (8) opposite to the first liquid chamber (A). A liquid-filled mount characterized by the following. 2. The cup member (2) according to claim 1, wherein the cup member (2) has a support cylinder (24), and is fitted to a surface of the partition (8) opposite to the first liquid chamber (A). A liquid-filled mount, wherein an inner peripheral support ring (72) of a diaphragm (7) is supported by the support cylinder (24). 3. The manufacturing method of a liquid-filled mount according to claim 1, wherein the outer peripheral portion (7a) of the diaphragm (7) is fitted to the outer cylindrical portion (21) of the cup member (2). The inner peripheral surface of the diaphragm (7) is supported on the inner peripheral surface of the fitting step (83) formed on the outer peripheral side of the idle orifice (D) of the partition (8) toward the first liquid chamber (A). Ring (72)
The outer periphery of the partition wall (8), the diaphragm (7), and the cup member (2), which are temporarily assembled together, are separated from each other by the elastic body (6) and the center boss (4). A method for assembling a liquid-filled mount, comprising: caulking and fixing in a liquid to a cylinder (1). 4. The partition (8) according to claim 3, wherein the partition (8) has a plurality of openings (82a to 82f) in the circumferential direction in advance along the shock orifice (C), and the partition (8) is temporarily assembled. 8) When the outer peripheral portions of the diaphragm (7) and the cup member (2) are caulked and fixed in a liquid to the outer cylinder (1) in which the elastic body (6) and the center boss (4) are integrated, An opening (8) located at a portion other than the open end of the shock orifice (C) to the first liquid chamber (A)
2b to 82f) are closed by an elastic body (6).