WO2006025111A1

WO2006025111A1 - Liquid-sealed vibration-isolating device

Info

Publication number: WO2006025111A1
Application number: PCT/JP2004/012749
Authority: WO
Inventors: Shingo Hatakeyama; Yukio Takashima
Original assignee: Toyo Tire & Rubber Co., Ltd.
Priority date: 2004-09-02
Filing date: 2004-09-02
Publication date: 2006-03-09
Also published as: JPWO2006025111A1; JP4266981B2

Abstract

A liquid-sealed vibration-isolating device enabling an increase in assemblage while stabilizing a variation in dynamic characteristics. In the device, upper and lower holding members (14) and (15) are formed of a thermoplastic resin material, a support plate member (16) is insert-molded into the lower holding member (15), and the joining faces of the upper holding member (14) and the lower holding member (15) holding the peripheral edge part of an elastic partition film (13) are fused to each other by a fusing means. Accordingly, a partition body (12) can be integrally formed of a plurality of members. As a result, since such complicated operations in a conventional liquid-sealed vibration-isolating device that a subsequent member is inserted into a second mounting fitting (2) while positioning its relative rotating direction to a first inserted member and the positioning of the inlet and outlet of an orifice is performed in a liquid tank is not needed, the assemblage can be remarkably increased accordingly, the instability of the positional relation between the outlet and inlet of the orifice can be avoided, and the variation in dynamic characteristics can be reduced accordingly.

Description

Specification

Liquid-filled vibration isolator

Technical field

[0001] The present invention relates to a liquid-filled vibration isolator.

Background art

A liquid-filled vibration isolator is known as an anti-vibration device that supports and fixes an automobile engine and does not transmit the engine vibration to the vehicle body frame.

[0003] In a liquid-filled vibration isolator, generally, a first attachment attached to the engine side and a second attachment attached to the body frame side are connected by an anti-vibration base made of a rubber-like elastic material. The Then, a liquid enclosure chamber is formed between the diaphragm attached to the second fixture and the vibration isolating base, and this liquid enclosure chamber is cut into a main liquid chamber and a sub liquid chamber by a partitioning means. The main and sub liquid chambers communicate with each other by an orifice.

[0004] According to this liquid-filled vibration isolator, the fluid flow effect between the main and sub liquid chambers by the orifice and the vibration damping effect of the vibration isolating substrate are superior to those obtained from the vibration isolating substrate alone. A vibration damping function and a vibration isolation function can be obtained.

[0005] In addition, the liquid-filled vibration isolator is further provided with various structures that can more suitably exhibit the fluid flow effect between the main and sub liquid chambers. Specifically, for example, by disposing the elastic partition membrane so as to partition between the main and sub liquid chambers and absorbing the hydraulic pressure fluctuation between the two liquid chambers by reciprocating deformation of the elastic partition membrane, It is a so-called movable membrane structure that obtains a low dynamic spring characteristic when a small amplitude is input.

However, when such a structure is adopted, the configuration (number of parts and shape) of partition means for partitioning the main and sub liquid chambers becomes complicated. For this reason, assembly of a liquid-filled vibration isolator that is simply a function and reliability is an important factor. In view of this, various techniques for improving the assemblability have been proposed.

[0007] For example, in Japanese Patent Application Laid-Open No. 2000-23600, a partition body is composed of an orifice member and a partition plate member to which a second diaphragm is vulcanized and bonded, and the partition plate member is used as a mounting bracket of the vibration isolator body. In addition to caulking and fixing, between the partition plate member and the holding part formed on the anti-vibration base A technique for improving the assemblability by holding the orifice member in the axial direction is disclosed (Patent Document 1).

[0008] Also, in Table 02/075128, the orifice member, the second diaphragm, and the partition plate member are configured separately from each other, and a concave groove formed in the peripheral portion of the second diaphragm is provided in the orifice member. Engage with the flange protruding inward, and hold the bottom wall of the groove between the flange and the partition plate member, avoiding problems such as adhesive peeling, and assembling A technique for improving the performance is disclosed (Patent Document 2).

Patent Document 1: Japanese Patent Laid-Open No. 2000-23600 (for example, paragraphs [0041-0047], FIG. 1 and FIG. 2)

Patent Document 2: No. 02-075128 (for example, Fig. 1 to Fig. 3)

Disclosure of the invention

Problems to be solved by the invention

However, in the conventional technique described above, after the lower mounting bracket is immersed in the liquid in the liquid tank so that the lower opening is directed upward, the cylinder of the lower mounting bracket is First, the orifice member (and the second diaphragm) is inserted into the cylindrical body, and then the partition plate member is inserted, which requires a two-step process. There was a problem that could not be achieved.

[0010] Further, when inserting the partition plate member into the cylindrical body portion of the lower mounting bracket, by inserting while positioning the relative rotational direction with respect to the previously inserted orifice member, It is necessary to align the orifice inlet / outlet, and as a result, it is not possible to sufficiently improve the assembly, and the positional relationship between the orifice inlet / outlet becomes unstable and the dynamic characteristics vary quickly. There was a point.

The present invention has been made to solve the above-described problems, and is a liquid-filled vibration isolator capable of improving assemblability while stabilizing variations in dynamic characteristics and the like. The purpose is to provide.

Means for solving the problem

In order to achieve this object, the liquid-filled vibration isolator according to claim 1 includes a first mounting tool, a cylindrical second mounting tool, the second mounting tool, and the second mounting tool. 1 Connect with fixture An anti-vibration base made of a rubber-like elastic material; a diaphragm attached to the second fixture to form a liquid enclosure chamber between the anti-vibration base; and the liquid enclosure chamber as the anti-vibration base. Partition means for partitioning into a main liquid chamber on the side and a sub liquid chamber on the diaphragm side, and a support plate member attached to the second fixture and sandwiching and fixing the partition means between the vibration isolating substrate, An orifice for communicating the main liquid chamber and the sub liquid chamber; and the partition means includes an elastic partition film formed of a rubber-like elastic body, and a peripheral portion of the elastic partition film. A pair of substantially annular sandwiching members that are sandwiched and fixed in the axial direction, and the pair of sandwiching members are made of a thermoplastic resin material, and the joining surfaces thereof are welded together by welding means, whereby the partition Means from the plurality of members Is the body to configured.

[0013] The liquid-filled vibration isolator according to claim 2 is the liquid-filled vibration isolator according to claim 1, wherein the support plate member is made of a metal material and the pair of The support plate member and the partition means are configured in a body-like manner by being insert-molded in one of the holding members.

[0014] The liquid-filled vibration isolator according to claim 3 is the liquid-filled vibration isolator according to claim 1 or 2, wherein the elastic partition film is disposed radially outward. A pair of sandwiching members, each including a first rubber portion configured to be thin and tapered, and a second rubber portion that is positioned radially outward from the first rubber portion and rises in the axial direction. A first stopper surface portion capable of receiving the first rubber portion of the elastic partition membrane, and a second rubber portion of the elastic partition membrane which is positioned so as to recede in the axial direction from the first stopper surface portion. A second stopper surface portion that can be stopped, and when the joint surfaces of the pair of clamping members are welded together by the welding means, the second stopper surface portion of the pair of clamping members is the elastic partition membrane. By pressing the second rubber part in the axial direction of the partition means, Precompression is configured to be applied to the second rubber portion of the elastic partition membrane.

The liquid-filled vibration isolator according to claim 4 is the liquid-filled vibration isolator according to claim 3, wherein the second stopper surface portion of the pair of clamping members is the partition means. The end portion on the radially inner side is curved in a circular arc shape in cross section.

[0016] The liquid-filled vibration isolator according to claim 5 is any one of claims 1 to 4. In the liquid-filled vibration isolator described above, the pair of holding members includes a projecting portion projecting from one joint surface and a recess projecting from the other joint surface to receive the projecting portion. A recessed portion, and is configured to be fitted together in the axial direction of the partition means, and is configured to be able to contact the top of the protruding portion and the bottom of the recessed portion.

[0017] The liquid-filled vibration isolator according to claim 6 is the liquid-filled vibration isolator according to any one of claims 2 to 5, wherein the support plate member includes the support plate member. The projecting wall is formed to project radially outward from one outer peripheral surface of the pair of sandwiching members, and the projecting wall facing the support plate member with a predetermined distance therebetween is one of the pair of sandwiching members or By being formed so as to project radially outward from the other side, an orifice groove having a substantially U-shaped cross section with an open peripheral side surface is formed on the outer peripheral portion of the partition means.

[0018] The liquid-filled vibration isolator according to claim 7 is the liquid-filled vibration isolator according to any one of claims 1 to 6, wherein the elastic partition membrane includes A thin plate member made of a metal material and embedded in a substantially thin plate shape, and an outer peripheral edge of the thin plate member is located on the radially outer side of the radially inner end surfaces of the pair of clamping members. It is configured to be located.

[0019] The liquid-filled vibration isolator according to claim 8 is the liquid-filled vibration isolator according to claim 7, wherein the elastic partition film has an opening formed substantially at the center. Thus, only the peripheral edge of the thin plate member is configured to be carried on the elastic partition film.

[0020] The liquid-filled vibration isolator according to claim 9 is the liquid-filled vibration isolator according to any one of claims 3 to 8, wherein the pair of clamping members The first stopper surface portion has at least a radially inner side of the partition means spaced apart from the first rubber portion of the elastic partition film, and a gap is formed between the first stopper surface portion and the first rubber portion. Have

[0021] The liquid-filled vibration isolator according to claim 10 is the liquid-filled vibration isolator according to any one of claims 3 to 9, wherein the pair of sandwiching members has a first 1 The stopper surface part is in contact with the first rubber part of the elastic partition film at least on the radially outer side of the partition means, The thin plate member is configured such that an outer peripheral edge thereof is positioned on the radially outer side with respect to a contact portion between the first stopper surface portion and the first rubber portion.

The invention's effect

[0022] According to the liquid-filled vibration isolator according to claim 1, the pair of clamping members is made of a thermoplastic resin material, and the joint surfaces thereof are welded by welding means. Therefore, the partition means can be formed integrally from a plurality of members.

[0023] Therefore, since the partitioning means can be inserted into the cylindrical body of the second fixture at once, a plurality of members constituting the partitioning means are provided as in the conventional liquid-filled vibration isolator. Since it is possible to simplify the insertion process that does not require multiple steps of insertion into the cylindrical body of the fixture, there is an effect that the assembly can be greatly improved accordingly. .

[0024] In addition, if the partition means can be formed integrally from a plurality of members outside the liquid tank in advance, it can be relative to the previously inserted member as in a conventional liquid-filled vibration isolator. As a result, it is not necessary to perform the complicated operation of positioning the orifice entrance and exit in the liquid tank by positioning the rear member in the cylindrical body while positioning the correct rotation direction. In addition, it is possible to prevent the positional relationship between the orifice inlet and outlet from becoming unstable, so that the variation in dynamic characteristics can be reduced accordingly.

[0025] In the liquid-sealed device of the present invention, since the pair of holding members are each made of a resin material, it is possible to achieve a significantly lighter partitioning means than that of a metal material. effective.

[0026] Since the joining surfaces of the pair of sandwiching members are configured to be welded by the welding means, for example, when the members made of metal material force are integrated by force, crimping means or welding means Compared to this, there is an effect that it can be integrated quickly and at a low cost.

[0027] In addition, the configuration integrated by the press-fitting means requires precise management of the dimensional tolerance of the press-fitted portion, and the management cost increases. Therefore, the present invention is configured to be integrated by the welding means. If the cost can be reduced, there is an effect. [0028] Furthermore, since the peripheral portion of the elastic partition membrane is sandwiched and fixed by the pair of sandwiching members, there is no need to vulcanize and bond the sandwiching member and the elastic partition membrane. Accordingly, it is possible to reduce the material cost by eliminating the need for an adhesive, and it is possible to avoid the deterioration of the function due to the adhesion peeling.

[0029] According to the liquid-filled vibration isolator according to claim 2, in addition to the effect of the liquid-filled vibration isolator according to claim 1, the support plate member is made of a metal material. Since both of them are insert-molded in one of the pair of clamping members, the supporting member and the partition means can be formed integrally.

[0030] Therefore, since the support member and the partitioning means can be inserted into the cylindrical body of the second fixture at once, a plurality of partitioning means constituting the partitioning means as in the conventional liquid-filled vibration isolator. This can simplify the insertion process without having to perform multiple processes by inserting each part into the cylindrical body of the fixture and then inserting the support plate member. There is an effect that the assemblability can be greatly improved.

[0031] Further, if the support plate member and the partitioning means can be integrally formed outside the liquid tank in advance, it can be relative to the previously inserted member as in a conventional liquid-filled vibration isolator. There is no need to perform the complicated operation of positioning the rotation direction and inserting the subsequent member into the cylindrical body and aligning the orifice inlet / outlet in the liquid tank. In addition, it is possible to prevent the positional relationship between the orifice inlet and outlet from becoming unstable, so that there is an effect that the variation in dynamic characteristics can be reduced accordingly.

[0032] Further, the insert plate of the support plate member into one of the pair of sandwiching members can effectively maintain the positional relationship between the pair of sandwiching members and the support plate member. .

That is, in the conventional liquid-filled vibration isolator, an orifice member (corresponding to a pair of clamping members) is clamped and fixed in the axial direction between the support plate member and the vibration isolating base holding portion. Yes, because the orifice member was not sufficiently fixed in the rotation direction, the orifice member shifted in the rotation direction during the insertion process of the support plate member or during travel, and the orifice flow path length changed from the specified length. There was a problem of end. [0034] On the other hand, in the present invention, since the support plate member is insert-molded to the clamping member, it is possible to prevent the clamping member from shifting in the rotation direction. As a result, the positional relationship between the orifice inlet and outlet can be stabilized and variations in dynamic characteristics can be reduced.

[0035] Here, in the configuration in which the support plate member is press-fitted into one of the sandwiching members and integrated, the positional relationship between the support plate member and the sandwiching member can be maintained firmly. In addition to the need for precise management, the management costs increase, and the press-fitting process is required, resulting in increased manufacturing costs.

[0036] On the other hand, if the structure is integrated by insert molding as in the present invention, the support plate member can be integrated with the sandwiching member simultaneously with the molding process of the sandwiching member, so the process is simplified. As a result, the manufacturing cost can be reduced correspondingly, and the management cost can be reduced.

[0037] According to the liquid-filled vibration isolator according to claim 3, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 1 or 2, the second of the elastic partition membrane The rubber part is configured to rise in the axial direction, and the second stopper surface part of the pair of clamping members is configured to retract in the axial direction from the first stopper surface part, so in the assembled state of the partitioning means, Since the second rubber portion enters the second stopper surface portion, there is an effect that it is possible to constitute a means for preventing the elastic partition film from coming off from the clamping member.

[0038] In addition, when the joint surfaces of the pair of sandwiching members are welded by the welding means, the second stopper surface portion of these sandwiching members serves as the center of the partitioning means for the second rubber portion of the elastic partition film. Since the second rubber portion of the elastic partition membrane is pre-compressed by pressing in the direction, the second rubber portion is filled between the second stubber surface portions. There is an effect that it is possible to suppress the formation of a gap between the two rubber parts.

[0039] Therefore, since it is possible to suppress the occurrence of air pockets, after integrating the partition means outside the liquid tank, the partition means is inserted into the cylindrical body of the second fixture in the liquid tank. However, it is possible to suppress the intrusion of air (bubbles) into the liquid enclosure, and as a result, there is an effect that the dynamic characteristics can be reliably ensured while improving the assemblability.

[0040] According to the liquid-filled type vibration isolator according to claim 4, the claim 3 In addition to the effects exhibited by the liquid-filled vibration isolator, the second stopper surface is configured such that the radially inner end of the partition means is curved in a circular arc shape so that the elastic partition film can be moved back and forth. While improving the dynamic characteristics (for example, lowering the dynamic spring), it suppresses the occurrence of wear and damage due to contact with the end of the second stopper surface, thereby improving the durability of the elastic partition membrane. There is an effect that improvement can be achieved.

[0041] According to the liquid-filled vibration isolator according to claim 5, in addition to the effects of the liquid-filled vibration isolator according to claims 1 to 4 of the claims, The pair of clamping members are provided with a projecting portion and a recessed portion on their joint surfaces, and are configured to be fitted together in the axial direction of the partition means, so that the joint surfaces of the sandwich members are welded to each other. In the case of welding by this, the welding work can be performed with the clamping member temporarily fixed, and the working efficiency can be improved. Further, since the pair of holding members can be relatively positioned in the radial direction by fitting in the axial direction, the positioning work in the radial direction when performing the welding operation can be omitted. There is.

[0042] Further, the protruding portion and the recessed portion provided on the joint surface are configured such that the top of the protruding portion and the bottom of the recessed portion can be brought into contact with each other. The contact surface position can be brought closer to one end surface of the holding member by the length (the depth of the recessed portion). Therefore, the vibration transmitter (horn) of the ultrasonic welding means and the laser irradiator of the laser welding means arranged on the end surface of the clamping member and the contact surface (the top of the projecting portion and the bottom of the recessed portion) Since the distance between the contact surface and the contact surface can be reduced, it is possible to perform welding reliably.

[0043] According to the liquid-filled vibration isolator according to claim 6, in addition to the effects of the liquid-filled vibration isolator according to claims 2 to 5, An orifice groove having a substantially U-shaped cross-section with an open peripheral side surface portion is formed on the outer peripheral portion of the pair of clamping members. Therefore, after assembling the partitioning means outside the liquid tank, Even when immersed in water, air can be easily discharged from the orifice groove, and as a result, the occurrence of air pockets can be reliably suppressed.

[0044] According to the liquid-filled vibration isolator according to claim 7, in addition to the effects exhibited by the liquid-filled vibration isolator according to claims 1 to 6, When a relatively small amplitude is input, a thin plate member made of a metal material is mounted on an elastic partition membrane. In addition, while maintaining the low dynamic spring characteristics, it is possible to ensure a high damping characteristic when a relatively large amplitude is input, and to avoid the occurrence of abnormal noise.

[0045] For example, V, a so-called elastic membrane structure (the elastic partition membrane is arranged between the main and sub liquid chambers, and the hydraulic pressure fluctuation between the two chambers is absorbed by the reciprocating displacement of the elastic partition membrane, In the case of a configuration that obtains a low dynamic spring characteristic at the time of amplitude input), since the rigidity of the elastic partition film is constant regardless of the amplitude, an attempt to obtain a low dynamic spring characteristic at the time of small amplitude input (for example, The film thickness is reduced, or the rubber hardness is softened.) When a large amplitude is input, the fluid pressure difference between the two chambers is over-relaxed by the elastic partition film, and the fluid flow effect is fully exhibited. (Ie, it becomes difficult for the liquid to flow to the orifice). As a result, there is a problem in that the attenuation characteristic is significantly reduced.

[0046] On the other hand, a so-called movable membrane structure (displacement restriction members are provided on both sides of the elastic partition membrane, and the amount of displacement of the elastic partition membrane is regulated from both sides to increase membrane stiffness, thereby increasing the high Since the elastic partition membrane abuts against the displacement restricting member (impacts), the displacement restricting member vibrates at the time of the collision, and the vibration is transmitted to the body frame. There was a problem that abnormal noise was generated by transmission. In addition, since the opening area for transmitting the hydraulic pressure of the main or sub liquid chamber to the elastic cutting membrane is narrowed by the displacement regulating member, it becomes difficult to absorb the hydraulic pressure difference, and low dynamic spring characteristics are obtained accordingly. There was also the problem of difficulty.

[0047] On the other hand, according to the liquid-filled vibration isolator of the present invention, when the elastic partition film is displaced with the input of a relatively large amplitude vibration, the thin plate member constituted by the metal material force is provided. Since the rigidity of the elastic partition membrane can be reinforced and the deformation of the elastic partition membrane as a whole can be restricted, the liquid can smoothly flow to the orifice, and the fluid flow effect can be sufficiently exerted. As a result, a high attenuation characteristic can be obtained without generating abnormal noise.

[0048] Furthermore, since the outer peripheral edge of the thin plate member is positioned on the radially outer side with respect to the radially inner end surface of the sandwiching member, the outer peripheral portion of the thin plate member when viewed in the axial direction of the partition means A pair of clamping members can be polymerized to facilitate control of the reciprocating displacement of the elastic partition membrane. As a result, it is possible to more reliably obtain a high damping characteristic when a relatively large amplitude vibration is input. S can. [0049] When a relatively small amplitude vibration is input, the elastic partition membrane is reciprocally displaced to absorb the hydraulic pressure difference between the main and sub liquid chambers and to achieve low dynamic spring characteristics. Obtainable. According to the liquid-filled vibration isolator of the present invention, since it is not necessary to provide a displacement regulating member, the opening area can be secured larger, and the hydraulic pressure difference can be absorbed more efficiently. Therefore, a low dynamic spring characteristic can be obtained with certainty.

[0050] Here, when the first rubber portion of the elastic partition membrane is formed in a taper shape that becomes thinner toward the radially outer side, the action of the taper shape makes the elastic partition membrane easily reciprocatingly displaced. Therefore, it is possible to obtain a further reduced dynamic spring of the spring characteristics when a relatively small amplitude vibration is input.

[0051] According to the liquid-filled vibration isolator according to claim 8, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 7, an opening is provided at a substantially central portion of the elastic partition membrane. Since the opening is formed and only the peripheral edge of the thin plate member is embedded in the elastic partition membrane, the amount of rubber-like elastic material used is reduced by the opening of the opening, and the material This has the effect of reducing costs.

[0052] In addition, by providing the opening at the substantially central portion of the elastic partition membrane as described above, the opening area of the opening can be changed and the rigidity of the entire elastic partition membrane can be adjusted as appropriate. effective. As a result, it is possible to facilitate tuning for obtaining desired dynamic characteristics (for example, high damping characteristics and low dynamic spring characteristics) and to reduce the tuning cost.

[0053] It should be noted that such a reduction in the amount of rubber-like elastic material used cannot be employed with conventional elastic partition membranes (that is, when the film thickness is reduced, the damping characteristics are reduced due to the reduction in film rigidity). On the other hand, if the rubber hardness is increased and the rigidity is increased, the low dynamic spring characteristics cannot be obtained.) As in the present invention, it is only possible to use a thin plate member mounted on the elastic partition membrane. It is. As a result, the material cost can be reduced, the weight can be reduced, and the dynamic characteristics (low dynamic spring characteristics and high damping characteristics) can be achieved at the same time.

[0054] According to the liquid-filled vibration isolator according to claim 9, in addition to the effect exhibited by the liquid-filled vibration isolator according to any of claims 3 to 8, the elastic partition There is a gap at least radially inward between the first rubber part of the membrane and the first staggered surface part of the clamping member. As a result, the elastic partition membrane is easily reciprocated and the low dynamic spring characteristics when a relatively small amplitude vibration is input can be obtained. ^{There is S.}

[0055] According to the liquid-filled vibration isolator according to claim 10, in addition to the effects of the liquid-filled vibration isolator according to claims 3 to 9 of the claims, The first rubber part of the elastic partition membrane and the first stubber surface part of the clamping member are in contact with each other at least on the radially outer side. Because it is configured to be located on the radially outer side of the part, the regulation of the reciprocating displacement of the elastic partition membrane is ensured, and the high damping characteristics when relatively large amplitude vibration is input There is an effect that can be obtained.

[0056] It should be noted that the first stopper surface portion may be configured to press the first rubber portion in the axial direction so that pre-compression is applied to the first rubber portion. As a result, the rigidity of only the first rubber portion of the elastic partition membrane is increased, and accordingly, the elastic partition membrane is more difficult to reciprocate and the damping characteristics can be further increased. .

Brief Description of Drawings

FIG. 1 is a cross-sectional view of a liquid-filled vibration isolator according to one embodiment of the present invention.

[FIG. 2] (a) is a top view of the elastic partition membrane, and (b) is a cross-sectional view of the elastic partition membrane along the lib-lib line in FIG. 2 (a).

FIG. 3 (a) is a top view of the upper clamping member, and FIG. 3 (b) is a cross-sectional view of the upper clamping member along the line IIIb_IIIb in FIG. 3 (a).

[FIG. 4] (a) is a top view of the lower holding member, and (b) is a cross-sectional view of the lower holding member taken along the line IVb-IVb in FIG. 4 (a).

FIG. 5 (a) is an exploded sectional view of the partition body 12, and (b) is a longitudinal sectional view of the partition body 12.

FIG. 6 is a partially enlarged sectional view of a partition body 12 in a modified example.

Explanation of symbols

[0058] 100 liquid filled vibration isolator

1 First mounting bracket (first mounting bracket) 2 Second mounting bracket (second mounting bracket)

6 Cylindrical bracket (part of second fixture)

7 Bottom bracket (part of second fixture)

3 Anti-vibration substrate

9 Tajyafram

11 Liquid enclosure

11A Main liquid chamber

11B Secondary liquid chamber

12 Partition (partitioning means)

13 Elastic partition membrane

13a opening

13c 1st rubber part

13d Second rubber part

31 Thin plate members

14 Upper clamping member (Clamping member)

15 Lower clamping member (Clamping member)

14c Overhanging wall

14a, 15a First stopper surface

14b, 15b Second stopper surface

14e Concave portion (joint surface)

14el bottom (part of joint surface)

15c Projection

14cl top (part of joint surface)

16 Support plate member

25 Orifice

d Orifice groove

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. Figure 1 1 is a cross-sectional view of a liquid-filled vibration isolator 100 according to an embodiment of the present invention.

[0060] The liquid-filled vibration isolator 100 is a vibration isolator for supporting and fixing the engine of the automobile and preventing the engine vibration from being transmitted to the vehicle body frame. As shown in FIG. A first mounting bracket 1 mounted on the engine side, a cylindrical second mounting bracket 2 mounted on the vehicle body frame side below the engine, and a vibration-isolating base 3 composed of a rubber-like elastic body that connects them. It is mainly equipped with.

[0061] The first mounting bracket 1 is formed in a substantially flat plate shape from a steel material or the like. As shown in FIG. 1, a mounting bolt 4 protrudes upward at a substantially central portion thereof. In addition, a positioning pin 5 for positioning a stabilizer fitting 8 to be described later projects from the side of the mounting bolt 4.

[0062] The second mounting bracket 2 includes a cylindrical metal fitting 6 on which the vibration-proof base 3 is vulcanized and a bottom metal fitting 7 attached to the lower side of the cylindrical metal fitting 6. As shown in FIG. 1, the cylindrical fixture 6 is formed in a cylindrical shape having an opening extending upward, and the bottom metal fitting 7 is formed in a cup shape from a steel material or the like. In addition, at the bottom of the bottom metal fitting 7, a positioning bolt 7 a is press-molded into a convex shape while a mounting bolt 4 is projected.

As shown in FIG. 1, the vibration isolator base 3 is formed from a rubber-like elastic body so as to have a substantially frustoconical cross section, and between the lower surface side of the first mounting bracket 1 and the upper end opening of the cylindrical bracket 6. Is vulcanized and bonded. Further, a rubber film 3a covering the inner peripheral surface of the cylindrical metal fitting 6 is connected to the lower end portion of the vibration isolating base 3. The rubber film 3a has a protruding wall 14c and a support plate member of a partition body 12 to be described later. 16 is in close contact.

[0064] As shown in FIG. 1, a protrusion 3b is formed at one end (right side of FIG. 1) of the vibration isolator base 3, and this protrusion 3b comes into contact with the stabilizer bracket 8 to It is configured to obtain a staggered action at the time. A part of the cylindrical metal fitting 6 that secures the rigidity and strength is supported on the protruding portion 3b.

The diaphragm 9 is formed from a rubber-like elastic body into a rubber film shape having a partial spherical shape, and is vulcanized and bonded to a donut-like mounting plate 10 as viewed from above. As shown in FIG. 1, the diaphragm 9 is attached to the second mounting bracket 2 by fixing the mounting plate 10 between the tubular bracket 6 and the bottom bracket 7. As a result, the upper surface side of this diaphragm 9 A liquid sealing chamber 11 is formed between the lower surface side of the base 3.

[0066] In the liquid sealing chamber 11, an antifreeze liquid (not shown) such as ethylene glycol is sealed. As shown in FIG. 1, the liquid sealing chamber 11 is divided into a main liquid chamber 11A on the vibration isolating base 3 side (upper side in FIG. 1) and a sub liquid chamber on the diaphragm 9 side (lower side in FIG. 1) by a partition 12 described later. It is divided into two rooms with 11B.

As shown in FIG. 1, the partition body 12 includes an elastic cutting film 13 configured from a rubber-like elastic body in a substantially disc shape, and the peripheral portion of the elastic partition film 13 as an axial center of the partition body 12. Upper and lower clamping members 14 and 15 that are clamped and fixed in the direction (vertical direction in FIG. 1), and a support plate member 16 that is insert-molded into the lower clamping member 15 are provided.

[0068] An orifice groove d having a substantially U-shaped cross section is formed on the outer peripheral surface side of the partition body 12, and covers the orifice groove d and the inner peripheral surface of the second mounting bracket 2 (tubular metal fitting 6). As shown in FIG. 1, an orifice 25 is formed between the rubber film 3a. The orifice 25 is an orifice channel that communicates the main liquid chamber 11A and the sub liquid chamber 11B.

[0069] The orifice 25 is communicated with the main liquid chamber 11A via the notch portion 14cl of the upper clamping member 14 and the sub liquid chamber via the through hole 16a of the support plate member 16 as described later. It communicates with 11B.

[0070] As shown in FIG. 1, the partition body 12 includes a partition body receiving portion 3c provided on the vibration isolating base 3 and a support plate member 16 in the axial center direction of the second mounting bracket 2 (upper and lower surfaces in FIG. 1). Direction).

That is, the partition body receiving portion 3c is formed as a stepped portion over the entire circumference on the lower surface side of the vibration isolating base 3, and the upper end surface of the upper clamping member 14 is locked by the stepped portion. In the assembled state of the liquid-filled vibration isolator 100, the partition receiving portion 3c is compressed and deformed, and the elastic restoring force of the partition receiving portion 3c acts on the upper clamping member 14 as a holding force. Thus, the partition body 12 can be clamped and fixed firmly and stably.

[0072] As shown in FIG. 1, the support plate member 16 has its inner peripheral side inserted into the lower clamping member 15, and its outer peripheral side has the second mounting bracket 2 (the cylindrical bracket 6 and the bottom). The partition 12 is firmly held by the partition receiving portion 3c in combination with the holding force. As a result, even when a large amplitude or a high frequency amplitude is input, chattering of each member constituting the partition 12 can be suppressed, which is caused by a positional deviation or resonance of each member. The influence on the dynamic characteristics can be avoided.

Next, the members 13, 14, 15 and 16 constituting the partition body 12 will be described with reference to FIGS. 2 to 5. 2 to 5 indicate the members 13, 14, 15, 1

6 axes.

[0075] First, the elastic partition film 13 will be described with reference to FIG. FIG. 2 (a) is a top view of the elastic partition membrane 13, and FIG. 2 (b) is a cross-sectional view of the elastic partition membrane 13 along the lib-lib line of FIG. 2 (a).

As shown in FIG. 2, the elastic partition film 13 is formed in a substantially disk shape from a rubber-like elastic body, and a thin plate member 31 formed in a substantially thin plate shape from a metal material is supported thereon. The thin plate member 31 is formed in a substantially disc shape concentric with the elastic partition film 13.

It should be noted that an opening 13a (see FIG. 2 (a)) that is substantially circular in the axial direction is formed on both sides at a substantially central portion of the elastic partition film 13, and the thin plate member 31 has a peripheral portion thereof. Only is embedded in the elastic partition membrane 13. Further, the outer peripheral edge of the thin plate member 13 is positioned at a boundary portion between a first rubber portion 13c and a second rubber portion 13d described later.

As shown in FIG. 2, the elastic partition film 13 includes a rubber film portion 13b in which a thin plate member 31 is embedded and formed to have a substantially constant thickness, and a radially outer side than the rubber film portion 13b. The first rubber portion 13c, which is formed in a tapered shape that is located on the side and becomes thinner toward the radially outer side (that is, constricted in the axial direction (Fig. 2 (b) vertical direction)) and the first rubber The second rubber portion 13d is located on the radially outer side of the portion 13c and rises in the axial direction to be higher than the first rubber portion 13c.

[0079] The elastic partition film 13 has the first and second rubber portions 13c, 13d as upper and lower clamping members.

14 and 15 are clamped (pressed) in the axial direction (Fig. 2 (b) vertical direction), and in the assembled state of the partition 12, the first and second rubber portions 13c and 13d are moved in the axial direction. Pre-compression is applied (see Figure 5).

[0080] Thus, by applying pre-compression to the first and second rubber portions 13c, 13d, the elastic partition membrane

13 to prevent gaps between the upper and lower clamping members 14, 15 Can be avoided.

That is, when a gap is provided between the elastic partition membrane 13 and the upper and lower holding members 14 and 15, when the partition body 12 is immersed in the liquid tank, the air enters the gap. Accumulation tends to occur, and the dynamic characteristics are seriously affected. Thus, it is difficult to completely remove the bubbles that have entered the gap in the liquid tank, and the work cost is increased accordingly.

Next, the upper holding member 14 will be described with reference to FIG. FIG. 3 (a) is a top view of the upper clamping member 14, and FIG. 3 (b) is a cross-sectional view of the upper clamping member 14 along the line IIIb_IIIb in FIG. 3 (a).

[0083] The upper holding member 14 is formed in a substantially annular shape from a thermoplastic resin material, and the bonding surface of the upper holding member 14 is welded by the welding means while holding the peripheral portion of the elastic partition film 13 together with the lower holding member 15 described later. It is welded and integrated with the lower clamping member 15 and the elastic partition film 13 (see FIG. 5).

As shown in FIG. 3, the upper clamping member 14 includes a first stopper surface portion 14a that presses the first rubber portion 13c of the elastic partition film 13, and a radially outward side from the first stopper surface portion 14a. And a second stopper surface portion 14b that is formed (recessed) so as to recede in the axial direction from the first stopper surface portion 14a. Note that the first stopper surface portion 14a is formed such that the radially inner end is curved in a circular arc shape in cross section.

Further, as shown in FIG. 3, a protruding wall 14c is formed on the outer peripheral side of the upper clamping member 14 so as to protrude radially outward. The overhanging wall 14 is an orifice forming wall for forming an orifice 25 (see FIG. 1), and is opposed to a later-described support plate member 16 with a predetermined interval (see FIG. 5).

[0086] In addition, the overhanging wall 14 is formed with a notch portion 14cl having a substantially U-shape when viewed from above. This notch 14cl is an orifice inlet / outlet for communicating the orifice 25 with the main liquid chamber 11A.

Here, as shown in FIG. 3 (b), the upper holding member 14 is provided with a recessed portion 14e on the radially outward side of the second stopper surface portion 14b. The inner surface of the portion 14e is a bonding surface that is welded to the lower clamping member 15 by welding means. As will be described later, the recessed portion 14e is configured to be able to fit in the axial direction with the protruding portion 15c (see FIG. 4) of the lower clamping member 15. Yes.

[0088] In the assembled state of the partition body 12 (see Fig. 5), the bottom portion 14el of the recessed portion 14e and the top portion 15cl of the protruding portion 15c are configured to be able to contact each other. 14el and top 15cl) are mainly welded by welding means.

[0089] Next, the lower clamping member 15 will be described with reference to FIG. 4 (a) is a top view of the lower clamping member 15, and FIG. 4 (b) is a lower clamping member 1 taken along the line IVb-IVb in FIG. 4 (a).

FIG.

[0090] The lower holding member 15 is formed in a substantially annular shape from a thermoplastic resin material. As described above, the lower holding member 15 holds the peripheral portion of the elastic partition film 13 together with the upper holding member 14 by the welding means. The joint surfaces are welded to each other, thereby being integrated with the upper clamping member 14 and the elastic partition film 13 (see FIG. 5).

[0091] As shown in Fig. 4, the lower clamping member 15 includes a first stopper surface portion 15a that presses the first rubber portion 13c of the elastic partition film 13, and a radially outer side than the first stopper surface portion 15a. And a second stopper surface portion 15b which is formed (recessed) so as to recede in the axial direction from the first stopper surface portion 15a. The first stopper surface portion 15a is formed such that the radially inner end is curved in a circular arc shape in cross section.

Here, as shown in FIG. 4 (b), the lower clamping member 15 is provided with a protruding portion 15c protruding outward in the radial direction of the second stopper surface portion 15b. The outer surface of the installation portion 14e is a bonding surface that is welded to the upper clamping member 14 by welding means. As described above, the projecting portion 15c is configured to be able to fit in the axial direction with the recessed portion 14e (see FIG. 3) of the upper clamping member 14.

[0093] In the assembled state of the partition body 12 (see Fig. 5), as described above, the top portion 15cl of the projecting portion 15c and the bottom portion 14el of the recessed portion 14e are configured to contact each other. The contact portions (the top portion 15c 1 and the bottom portion 14e 1) are mainly welded by the welding means.

As shown in FIG. 4, the lower clamping member 15 is formed by a support plate member 16 force S insert molding made of a metal material. The support plate member 16 is formed so as to project radially outward from the outer peripheral side of the lower clamping member 15, whereby the outer peripheral portion of the partition 12 has a substantially U-shaped cross-section with a peripheral side surface open. An orifice groove d is formed (see FIGS. 1 and 5). Note that the support plate member 16 is formed with a through hole 16a having a substantially elongated hole shape when viewed from above in the plate thickness direction (up and down direction in FIG. 4 (b)). The through hole 16a is an orifice inlet / outlet for communicating the orifice 25 with the sub liquid chamber 11B.

[0096] Further, a vertical wall 15d for isolating the orifice 25 in the circumferential direction is formed on the side of the through hole 16a (upper side in Fig. 4 (a)).

[0097] Next, a method for integrating the partition 12 from a plurality of members will be described with reference to FIG. FIG. 5 (a) is an exploded cross-sectional view of the partition body 12, and FIG. 5 (b) is a vertical cross-sectional view of the partition body 12. FIG.

As shown in FIG. 5 (a), the elastic partition film 13 is clamped by the upper and lower clamping members 14, 15 on both sides. In this case, first, temporary fixing and positioning in the radial direction (FIG. 5 (a) left-right direction) are performed by press-fitting (fitting) the convex portion 15c of the lower clamping member 15 into the concave portion 14e of the upper clamping member 14. Next, the upper clamping member 14 is further pushed toward the lower clamping member 15 in the axial direction, so that the joint surfaces of the upper and lower clamping members 14 and 15 (that is, the bottom of the recessed portion 14e) 14el and the top portion 15cl) of the projecting portion 15c are brought into contact with each other.

[0099] Thereby, the first and second stopper surface portions 14a, 14b, 15a, 15b of the upper and lower clamping members 14, 15 move the first and second rubber portions 13c, 13d of the elastic partition film 13 in the axial direction. (Fig. 5 (a) Up and down direction) Pre-compression is applied to the first and second rubber portions 13c and 13d which are applied with force. As a result, the first and second rubber portions 13c, 13d are filled in a space surrounded by the first and second stopper surface portions 14a-15b.

[0100] Then, the joining surfaces of the upper and lower holding members 14, 15 in contact with each other (that is, the bottom portion 14el of the recessed portion 14e and the top portion 15cl of the protruding portion 15c) are welded by the welding means. Thereby, as shown in FIG. 5 (b), the partitioning means 12 is integrally configured by the plurality of members 13-16.

Here, examples of the welding means include known techniques such as an ultrasonic welding method and a laser welding method. In the ultrasonic welding method, pressure and ultrasonic vibrations are applied to the joint surfaces of the upper and lower clamping members 14 and 15 (that is, the bottom 14el of the concave portion 14e and the top 15cl of the convex portion 15c), and the friction between them. The resin material on the bonding surface is melted and bonded by heat.

[0102] Further, in the laser welding method, the upper holding member 14 is made of a light-transmitting thermoplastic resin material. On the other hand, the lower holding member 15 is made of a light-absorbing thermoplastic resin material, and pressure is applied to the joining surfaces (that is, the bottom portion 14el of the concave portion 14e and the top portion 15cl of the convex portion 15c). By irradiating with the laser beam focused near the boundary, the top 15cl (light-absorbing resin material) of the projecting portion 15c generates heat and the heat is also transmitted to the bottom 14e 1 of the recessed portion 14e. Therefore, the joint surface is melted and joined.

[0103] It should be noted that the welding by the above-mentioned welding means on the joint surface may be performed partially in the circumferential direction (for example, four force points at 90 ° intervals in the circumferential direction) or all in the circumferential direction. It may be performed around the lap. If it is performed partially, the welding cost can be reduced. On the other hand, if it is performed all around, the reliability of the bonding strength can be ensured.

Here, in the assembled state of the partition body 12, as shown in FIG. 5 (b), the outer peripheral edge of the thin plate member 13 is the end face on the radially inner side of the upper and lower holding members 14, 15 It is comprised so that it may be located in the diameter direction outside rather than. Therefore, when viewed in the axial direction of the partition 12, the outer peripheral edge of the thin plate member 13 is configured to overlap with the upper and lower clamping members 14 and 15.

[0105] Although the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. Something can be easily guessed.

For example, in the above embodiment, as an application target of the present invention, the liquid filled type vibration isolator provided between the engine of the automobile and the vehicle body frame has been described as an example. However, the present invention is not necessarily limited thereto. However, it is naturally possible to apply the present invention to other liquid-filled vibration isolator. For example, the present invention may be applied to a liquid-filled vibration isolator provided between the transmission and the vehicle body frame.

[0107] In the above embodiment, the first rubber portion 13c of the elastic partition film 13 is pre-compressed in the axial direction from the first stopper surface portions 14a, 15a of the upper and lower clamping members 14, 15. Although the case where it is done was explained, it is not necessarily limited to this.

For example, in the assembled state of the partition body 12, a gap is provided between the first rubber part 13c of the elastic partition film 13 and the first staggered surface parts 14a, 15a of the upper and lower clamping members 14, 15 It can be configured as well. This facilitates reciprocating deformation of the elastic partition film 13. When a relatively small amplitude vibration is input, the low dynamic spring characteristic can be ensured.

[0109] Alternatively, these may be combined. Specifically, as shown in FIG. 6, on the radially inner side (left side in FIG. 6), the first rubber portion 13c of the elastic partition film 13 and the first staggered surface portions of the upper and lower clamping members 14, 15 While a gap is formed between 14a and 15a, on the radially outer side (right side in FIG. 6), the first rubber portion 13c of the elastic partition film 13 and the first of the upper and lower clamping members 14, 15 The staggered surface portions 14a and 15a are configured to abut (contact).

[0110] In this case, on the radially outer side, the first rubber portion 13c of the elastic partition film 13 may be configured to be pre-compressed in the axial direction. Further, as shown in FIG. 6, the outer peripheral edge of the thin plate member 31 is configured to be positioned radially outward from the contact portion between the first rubber portion 13c and the first stopper surface portions 14a and 15a. Also good. As a result, it is possible to obtain a high damping characteristic when a relatively large amplitude vibration is input while securing a low dynamic spring characteristic when a relatively small amplitude vibration is input.

Claims

The scope of the claims

[1] A first mounting tool, a cylindrical second mounting tool, the second mounting tool and the first mounting tool connected to each other, and a vibration isolating base made of a rubber-like elastic material; A diaphragm which is attached to a fixture and forms a liquid enclosure chamber with the vibration isolation substrate, and a partition which divides the liquid enclosure chamber into a main liquid chamber on the vibration isolation substrate side and a sub liquid chamber on the diaphragm side Means, a support plate member that is attached to the second fixture and clamps and fixes the partition means between the vibration-proof base and an orifice that communicates the main liquid chamber and the sub liquid chamber. In the enclosed vibration isolator,

The partition means includes an elastic partition film constituted by a rubber-like elastic body force, and a pair of substantially annular sandwiching members that sandwich and fix the peripheral edge portion of the elastic partition film in the axial direction of the partition means,

The pair of sandwiching members are made of a thermoplastic resin material, and the partitioning means is integrally constituted by the plurality of members by welding the joint surfaces of the pair of sandwiching members with a welding means. Liquid-filled vibration isolator.

[2] The support plate member has a metal material force and is insert-molded in one of the pair of clamping members, so that the support plate member and the partitioning unit are configured in a body. The liquid-filled type vibration damping device according to claim 1, wherein

[3] The elastic partition membrane has a first rubber portion configured to have a taper shape that is thinner toward a radially outer side thereof, and is positioned on a radially outer side than the first rubber portion, and in an axial direction. With a second rubber stand to stand up,

The pair of clamping members are positioned at a first stopper surface portion capable of receiving the first rubber portion of the elastic partition membrane, and retracted in the axial direction from the first stopper surface portion, and the elastic partition membrane A second staggered surface portion capable of receiving the second rubber portion,

When the joint surfaces of the pair of sandwiching members are welded by the welding means, the second stopper surface portion of the pair of sandwiching members serves as the second rubber portion of the elastic partition film in the axial direction of the partitioning means. 3. The liquid-filled vibration isolating device according to claim 1 or 2, wherein pre-compression is applied to the second rubber portion of the elastic partition membrane by pressing to the elastic partition membrane. apparatus.

[4] The second stopper surface portion of the pair of sandwiching members is formed such that ends on the radially inner side of the partition means are curved in a circular arc shape in cross section. The liquid-filled vibration isolator as described.

[5] The pair of clamping members include a projecting portion projecting from one joint surface and a recessed portion recessed in the other joint surface and capable of receiving the projecting portion. Claims 1 to 1 are characterized in that they are configured to be fitted in the axial direction of the means, and are configured such that the top of the projecting portion and the bottom of the recessed portion can contact each other. 5. The liquid-filled vibration isolator according to any one of items 4.

[6] The support plate member is formed to project radially outward from one outer peripheral surface of the pair of clamping members, and an overhanging wall facing the support plate member with a predetermined interval therebetween. An orifice groove having a substantially U-shaped cross-section with a peripheral side surface open at the outer peripheral portion of the partition means is formed by projecting radially outward from one or the other of the pair of clamping members. The liquid-filled vibration isolator according to any one of claims 2 to 5, characterized in that the liquid is formed.

[7] The elastic partition membrane is provided with a thin plate member formed in a substantially thin plate shape from a metal material,

The outer peripheral edge of the thin plate member is configured to be located on the radially outer side of the end surfaces on the radially inner side of the pair of clamping members. The liquid-filled vibration isolator according to any one of the items.

[8] The elastic partition membrane has an opening formed substantially in the center,

8. The liquid filled type vibration damping device according to claim 7, wherein only the peripheral edge portion of the thin plate member is supported on the elastic partition membrane.

[9] At least the radially inner side of the partition means is separated from the first rubber portion of the elastic partition film, and the first stopper surface portion and the first rubber portion of the first staggered surface portion of the pair of clamping members are separated from each other. 9. A liquid-filled vibration isolator according to claim 3 or 8, wherein a gap is formed between the first and second parts.

[10] At least the radially outer side of the partition means is in contact with the first rubber portion of the elastic partition film in the first staggered surface portion of the pair of clamping members, The thin plate member is configured such that an outer peripheral edge thereof is positioned on the radially outward side with respect to a contact portion between the first stopper surface portion and the first rubber portion. 10. The liquid filled type vibration damping device according to any one of items 3 to 9.