JP2007064248A - Liquid-sealed vibration damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damper hardly allowing foreign matter to enter between an elastic membrane member and a cover member covering the elastic membrane member in the liquid-sealed vibration damper having the elastic membrane member absorbing the volumetric change of a liquid chamber. <P>SOLUTION: A plurality of projections are formed on the upper surface outer peripheral part of a diaphragm 32. With the cover member 36 installed to cover the upper side of the diaphragm 32, the projections abut on the cover member 36 and clearances are formed at areas where the projections are absent. The clearances form communication passages 39 for communicating a space part 38 formed between the diaphragm 32 and the cover member 36 near the axis of the vibration damper 1 to the outside. A swelled part swelling to the radial outer side is formed at the outer peripheral end of the diaphragm 32, and the hook parts 36a, 36a, ... formed at the outer peripheral end of the cover member 36 are engaged with the swelled part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator mainly for supporting a vibration generator such as an automobile engine, and more particularly to an elastic membrane member for absorbing volume change of a liquid chamber and a cover member covering the elastic membrane member Belongs to the technical field of structure.

  Conventionally, as this type of liquid-filled vibration isolator, for example, as disclosed in Patent Document 1, a first mounting member connected to a vibration receiving side (support side) such as a vehicle body frame, and a vibration of an engine or the like The second mounting member connected to the source side (supported body side) is connected by an elastic member so that a liquid chamber is defined between them, and vibration from the vibration source side is caused by elastic deformation of the elastic member. It is known to absorb water. Generally, in such a liquid filled type vibration isolator, an elastic film member is provided for absorbing the volume change of the liquid chamber, and foreign substances such as water and dust are not attached to the elastic film member. A cover member for covering this from above is provided.

Further, when a cover member that covers the elastic membrane member is provided as described above, in order to prevent an air layer between the elastic membrane member and the cover member from adversely affecting the deformation of the elastic membrane member, for example, Patent Document 2 As described above, a through hole for venting air is provided in the cover member.
Japanese Patent Publication No. 6-29635 JP-A 63-195444

  However, when a through hole is provided in the cover member as in Patent Document 2, foreign matter or the like may enter the space between the elastic membrane member and the cover member from the through hole and cause a problem. For example, when water enters the space from the through hole, there is a problem that the water accumulates in the space and generates a strange odor.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a liquid-filled vibration isolator including an elastic film member that absorbs a change in volume of a liquid chamber. An object of the present invention is to provide an anti-vibration device in which foreign matter is unlikely to enter the space between the elastic film member and the cover member by devising the structure of the cover member.

  In order to achieve the above object, in the liquid filled type vibration damping device according to the present invention, a space is formed between the elastic film member that partitions the liquid chamber in the cylindrical member or the elastic member, and the elastic film member. Thus, a gap for communicating the space portion with the outside was formed between the elastic membrane member and the cover member covering the elastic membrane member from above.

  Specifically, in the first aspect of the present invention, a connecting member connected to either the support side or the supported side, a cylindrical member connected to the other side of the support side or the supported side, and the connection An elastic member that elastically connects the member and the cylindrical member and relatively displaces both the members by elastic deformation, and covers the opening of the cylindrical member, and fills the inside of the cylindrical member or the elastic member with liquid. A cover member that covers the elastic film member from above while forming a space for allowing deformation of the elastic film member between the elastic film member that partitions the liquid chamber and the elastic film member; The elastic membrane member and the cover member are configured such that a gap that communicates the space portion with the outside is formed between both members in a part of the peripheral edge portion that is joined to each other.

  According to this configuration, the elastic film member is allowed to deform between the elastic film member that partitions the liquid chamber inside the cylindrical member or the elastic member and the cover member that covers the elastic film member from above. Not only the space part but also a gap for communicating the space part to the outside is formed, and the air in the space part can be vented through the gap, so that the cover member can be vented like the conventional structure. There is no need to provide a through hole. Thereby, it can prevent reliably that a foreign material penetrate | invades in a space part.

  In the above-described configuration, a plurality of protrusions spaced apart from each other in the circumferential direction are provided at a joint portion between the elastic film member and the cover member (invention of claim 2). Thus, by providing a plurality of protrusions on the surface of the elastic membrane member on the cover member side, when the cover member is brought into contact with the protrusions of the elastic film member, the portion where the protrusions are not provided Since a gap connected to the outside is formed between the cover member and the elastic membrane member, a gap that allows the space portion to communicate with the outside can be obtained reliably and easily.

  In addition, a bulging portion that bulges outward from the outer surface of the tubular member is formed at the peripheral portion of the elastic film member, while the bulging portion of the elastic film member is formed at the peripheral portion of the cover member It is preferable that a flange that can be engaged with is formed (the invention of claim 3).

  In this way, the cover member can be manually attached to the vibration isolator, eliminating the need for special equipment during assembly, and caulking and fixing the peripheral edge of the cover member together with the peripheral edge of the elastic membrane member to the casing, etc. The manufacturing cost can be reduced as compared with the conventional structure. Moreover, since the cover member that is made of metal in the case of caulking and fixing can be made of resin, it is possible to reduce the weight and cost of the apparatus.

  In addition, since the flange portion of the cover member is engaged with the bulging portion provided in the elastic membrane member, a moderation feeling at the time of engagement can be obtained, so the cover member is securely assembled to the vibration isolator. Can do.

  In addition, the tubular member is bent so that the side wall on the elastic membrane member side is curved inward in the radial direction, and the outer side of the curved portion increases as the thickness on the tubular member decreases downward. You may be covered with the bulging part of the elastic film member formed so that it might become small (invention of Claim 4).

  Thereby, since the bulging part of the elastic membrane member becomes thinner along the curved part of the tubular member, the bulging part of the cover member is engaged with the bulging part of the elastic film member. The flange moves from the thick and large deformation amount portion of the bulging portion to the thin and small deformation amount portion, that is, gradually expands along the curved portion of the tubular member. Then, it is possible to smoothly engage the bulging portion while gradually expanding the heel portion in the horizontal direction, and the engagement of the ridge portion to the bulging portion is facilitated. On the other hand, since the engaging portion of the bulging portion is formed relatively thin, the deformation amount of the bulging portion in a state in which the flange portion of the cover member is engaged can be reduced. It is possible to prevent the engagement with the flange from being easily disengaged.

  As described above, according to the liquid-filled vibration isolator according to the present invention, a gap is formed between the elastic membrane member and the cover member so that the space portion communicates with the outside. For this reason, it is not necessary to form a through hole for this purpose, and foreign matter can be reliably prevented from entering the space. In particular, if a plurality of protrusions are provided on the surface of the elastic membrane member on the cover member side so that a gap is formed between the cover member and the elastic film member by the protrusion, a gap for air venting is provided. It can be obtained reliably and easily.

  In addition, a bulging portion that bulges outward from the outer surface of the case member is provided at the peripheral portion of the elastic film member, while a collar portion that can be engaged with the bulging portion is formed at the peripheral portion of the cover member. By doing so, the work of attaching the cover member to the elastic membrane member is facilitated, and the manufacturing cost can be reduced. In particular, the bulging portion of the elastic membrane member is formed in the curved portion of the cylindrical member so that the thickness thereof becomes thinner as it goes downward, so that the flange portion of the case member is bulged out of the elastic membrane member. Engagement with the part is easy, and engagement can be made difficult to disengage in the engaged state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the following description of the embodiment is merely illustrative in nature, and does not mean that the present invention, its application, or its use is limited.

  As shown in FIG. 1, an anti-vibration mount device 1 (anti-vibration device) according to this embodiment is disposed between a power plant (supported side) composed of an engine or the like and a vehicle body (support side), for example. The connecting member 5 fixed to the lower side of the anti-vibration mount device 1 is integrally formed on the outer surface of the case 2 (tubular member) of the anti-vibration mount device 1 on the vehicle body side. 2c is connected to the power plant side. In addition, in the case 2 of the anti-vibration mount apparatus 1, as shown in FIG. 2, a mount main body portion 10 including a connection fitting 12 (connection member) connected to the connection member 5 at the lower end is housed. Yes.

  Specifically, as shown in FIG. 2, the mount main body 10 includes a metal cylindrical member 11 that is caulked and connected to the case 2, and the connection fitting 12 is formed by a rubber elastic body 13 (elastic member). Concatenated. The cylindrical member 11 has a cylindrical main body portion 11a disposed so as to extend in the up-down direction, and a flange portion 11b that extends by bending its upper side radially outward.

  As shown in FIG. 2, the connecting metal fitting 12 has a substantially conical shape with an upper portion formed in a conical shape and a lower portion formed in a substantially cylindrical shape. A bulging portion 12a that bulges radially outward is formed.

  Here, a stopper rubber 21 is provided on the bulging portion 12a formed on the connecting metal fitting 12 so as to be connected to the rubber elastic body 13 so as to cover the bulging portion 12a. The stopper rubber 21 is formed such that the outer peripheral surface side and the lower surface side of the bulging portion 12a are thicker than the upper surface side, and the case 2 connected to the power plant side has a horizontal direction and an upward direction. When these are greatly displaced, these rubbers come into contact with the inner peripheral surface and the bottom of the case 2 to restrict the displacement of the case 2.

  2 shows a state in which no load is applied to the mount body 10. In this state, the stopper rubber 21 of the mount body 10 and the bottom of the case 2 are close to each other. In the 1G state in which the vibration mount device 1 is attached to the vehicle body and the static load of the power plant is applied to the mount body 10, the rubber elastic body 13 is bent and the case 2 is displaced downward, although not shown, A predetermined interval is formed between the stopper rubber 21 and the stopper rubber 21.

  The upper end portion of the connection fitting 12 is disposed substantially coaxially so as to be positioned below the cylindrical member 11 and at the approximate center of the lower end opening, and a rubber elastic body 13 is disposed on the side surface portion of the upper recess. Is provided. On the other hand, the lower part of the connecting metal 12 is inserted through a hole 2b having a diameter larger than that of the lower part of the connecting metal 12 formed at the bottom of the case 2, and the lower end surface of the connecting metal 12 is on the vehicle body side. It joins with the volt | bolt 15 on the upper surface of the said connection member 5 connected (refer FIG. 2).

  The rubber elastic body 13 has a mortar-shaped concave portion formed on the inner peripheral side of the lower portion thereof, and the peripheral surface of the concave portion is attached to the tapered side surface portion of the connection fitting 12. Further, the rubber elastic body 13 is formed in a substantially truncated cone shape so as to expand radially outward from the entire circumference of the connection fitting 12 and to extend obliquely upward, and its upper portion is directed upward. It is open.

  A main body portion 11 a of the cylindrical member 11 is embedded in the upper portion of the rubber elastic body 13, while the flange portion 11 b of the cylindrical member 11 has a diameter over the entire circumference of the rubber elastic body 13. It protrudes outward in the direction, and is caulked by a flange portion 2a provided at an opening end portion of the bottomed cylindrical case 1 disposed so as to cover the mount main body portion 10 from below.

  As shown in FIG. 3, a resin-made orifice board 31 is disposed on the upper portion of the mount body 10 so as to cover the opening of the upper portion of the rubber elastic body 13 and covers the upper part thereof. A diaphragm 32 (elastic film member) is arranged as described above, and a liquid chamber 33 in which a buffer solution is sealed is constituted by the rubber elastic body 13 and the diaphragm 32.

  A part of an annular metal fitting 37 (case member) formed in a substantially hat shape and provided with a through-hole is embedded in the outer peripheral portion of the diaphragm 32. Specifically, the annular metal fitting 37 has a cylindrical side wall in which the top plate portion 37a in which the through hole is formed is embedded in the diaphragm 32 and extends downwardly from the outer peripheral end of the top plate portion 37a. The diaphragm 32 is bonded and fixed only to the inner peripheral surface side of the portion 37b. And the outer peripheral edge part of the collar part 37c extended toward the circumferential direction outward from the lower end of the said side wall part 37b is caulked with the flange part 11b of the cylindrical member 11 of the mount main-body part 10 to the flange part 2a of the case 2. .

  Further, in the space formed above the mount main body 10 by the annular metal fitting 37, the orifice plate 31 is sandwiched between the metal fitting 37 and the open end of the rubber elastic body 13 on the outer peripheral side thereof. Accordingly, the liquid chamber 33 is partitioned into a pressure receiving chamber 33a on the rubber elastic body 13 side and an equilibrium chamber 33b on the diaphragm 32 side.

  The two liquid chambers 33 a and 33 b defined by the orifice plate 31 communicate with each other through an orifice passage 34 formed in a spiral shape on the periphery of the orifice plate 31. Then, the buffer solutions in the pressure receiving chamber 33a and the equilibrium chamber 33b flow through each other through the orifice passage 34, so that low-frequency vibrations acting on the pressure receiving chamber 33a from the rubber elastic body 13 are attenuated. Yes. At this time, the diaphragm 32 is deformed so as to absorb the volume change of the equilibrium chamber 33b accompanying the flow of the buffer solution.

  The orifice disc 31 includes a main body portion 31a that forms a spiral orifice passage 34, and a disc-shaped lid portion 31b disposed so as to be in contact with the upper surface of the main body portion 31a. A plurality of through holes are formed in the lower surface of the main body portion 31a and the lid portion 31b, and a concave portion 31c for the movable plate is formed in the central portion on the upper surface side of the main body portion 31a. A movable plate 35 for absorbing high-frequency vibrations is fitted into the recess 31c, and is prevented from falling off by the lid portion 31b.

  Here, as shown in FIGS. 2 and 3, the diaphragm 32 is covered with a substantially hat-shaped resin cover member 36 so that foreign matter such as water and dust adheres to the diaphragm 32. In addition, a space portion 38 for absorbing deformation of the diaphragm 32 is formed between the diaphragm 32 and the cover member 36 and in the vicinity of the shaft center of the vibration-proof mount device 1. .

  Below, the structure of the said diaphragm 32 and the cover member 36 which are the characterizing parts of this invention is demonstrated in detail.

  As shown in FIG. 4A, a plurality of diaphragms 32 are arranged in the circumferential direction so as to be arranged in the circumferential direction on the upper surface of the outer peripheral portion (peripheral portion). Three projections 32a, 32a,... Are provided. These protrusions 32a, 32a,... Are formed so as to contact the cover member 36 in a state where the cover member 36 is disposed so as to cover the diaphragm 32. A gap 39 for communicating the space 38 with the outside is formed in a portion where the projections 32a, 32a,... 2 and 3).

  The diaphragm 32 has a bulging portion 32b that bulges outward in the radial direction over the entire circumference at a curved portion between the top plate portion 37a and the side wall portion 37b of the annular fitting 37 embedded in the diaphragm 32. The flange part 32b of the cover member 36 mentioned later engages with this bulging part 32b.

  Specifically, the bulging portion 32b of the diaphragm 32 is a curved portion between the top plate portion 37a and the side wall portion 37b of the annular metal fitting 37, and is formed so that the thickness decreases toward the lower side. Yes. Thereby, when engaging the collar part 36a of the said cover member 36 with the bulging part 32b, since the thickness is thick and the deformation | transformation amount is large, it is from the part which does not need to expand the collar part 36a largely radially outward. The flange 36a can be gradually expanded in accordance with the curvature of the annular fitting 37 and can be externally fitted to the side wall 37b of the annular fitting 37. The flange 36a can be easily fitted to the bulging portion 32b of the diaphragm 32. Can be engaged. On the other hand, in a state in which the flange portion 36a of the cover member 36 is engaged with the bulging portion 32b of the diaphragm 32, the engagement portion of the bulging portion 32b is thin and the deformation amount is small. The engagement of the flange 36a is not easily disengaged due to the deformation of the protruding portion 32b.

  As shown in FIG. 4B, an injection hole 32 c for injecting a buffer solution into the liquid chamber 33 is formed on the outer peripheral side of the diaphragm 32. The injection hole 32c is formed so as to penetrate the relatively thick outer peripheral portion of the diaphragm 32 in the thickness direction, and a ball (not shown) functioning as a stopper is inserted in the injection hole 32c in the middle thereof. A spherical space to hold is formed.

  As shown in FIG. 5, the cover member 36 is provided with a cylindrical portion 36 b extending in the cylindrical axis direction so as to overlap with a part of the cylindrical side wall portion 37 b of the annular fitting 37 embedded in the diaphragm 32. A flange 36a that engages with the bulging portion 32b of the diaphragm 32 is provided on the lower end side of the cylindrical portion 36b. The flange portion 36a is provided in a predetermined range in the circumferential direction of the substantially hat-shaped cover member 36 (in this embodiment, a predetermined range in three circumferential directions), and is a portion where the flange portion 36a is not provided. The gap 39 communicates with the outside. And the elongate hole 36c, 36c, ... long in the circumferential direction is formed in the eaves part of the cover member 36 corresponding to the cylindrical part 36 in which the said eaves part 36a, 36a, ... is provided.

  Because of the configuration of the cover member 36, the rigidity of the portion where the flange portions 36a, 36a,... Are provided is lower than the portion where the flange portions 36a, 36a,. When the flange portions 36a, 36a,... Of 36 are engaged with the bulging portion 32b of the diaphragm 32, deformation of the portions of the flange portions 36a, 36a,. It can be easily attached. In the present embodiment, the long holes 36c, 36c,... Are provided in order to reduce the rigidity of the portions where the flanges 36a, 36a,... Are provided. Any structure may be used as long as it reduces the rigidity.

  Further, as described above, by engaging the flange portions 36a, 36a,... Of the cover member 36 with the bulging portion 32b of the diaphragm 32, the flange portions 36a, 36a,. When this is done, a sense of moderation is obtained by the deformation of the flange portions 36a, 36a,.

  Further, since the cylindrical portion 36b of the cover member 36 is provided so as to overlap with the side wall portion 37b of the annular metal fitting 37, as shown in FIGS. 2 and 3, it is provided between the diaphragm 32 and the cover member 36. The gap 39 that communicates the space portion 38 with the outside opens toward the lower side, so that foreign matters and the like can be more reliably prevented from entering the space portion 38.

  With the above configuration, when the cover member 36 is assembled on the diaphragm 32, the cover member 36 comes into contact with the plurality of protrusions 32a, 32a,... Formed on the diaphragm 32, thereby forming the protrusions 32a, 32a,. A gap 39 is formed in the portion that is not formed, and the space 39 formed between the diaphragm 32 and the cover member 36 can be communicated to the outside by the gap 39. It is no longer necessary to form a through hole for venting air. Accordingly, it is possible to reliably prevent foreign matter from entering the space 38.

  Further, as described above, since the plurality of protrusions 32a, 32a,... Are formed on the diaphragm 32 and the gap 39 is formed between the cover member 36, the gap 39 can be reliably and easily formed. it can.

  Further, by engaging the flanges 36a, 36a,... Of the cover member 36 with the bulging portion 32b of the diaphragm 32, the cover member 36 can be attached to the diaphragm 32. Compared to the conventional structure in which the portion is caulked and fixed to the case 2 or the like, the assembly workability can be improved. In addition, in the case of caulking as in the prior art, it is necessary to use the metal cover member 36. However, as described above, the flange portions 36a, 36a,. If engaged, the cover member 36 can be made of resin, and the vibration-proof mount device 1 can be reduced in weight and manufacturing cost can be reduced.

(Other embodiments)
The configuration of the present invention is not limited to the above embodiment, and includes various other configurations. That is, in the above-described embodiment, the protrusions 32a, 32a,... Are provided at three positions in the circumferential direction on the upper surface of the diaphragm 32 so as to be arranged three at regular intervals. Projections 32a, 32a,... May be provided so as to be arranged at equal intervals.

It is a perspective view of an anti-vibration mount apparatus. It is a figure which shows a part of vibration isolating mount apparatus in a cross section. It is a partial expanded sectional view which expands and shows the attachment part of the cover member of an anti-vibration mount apparatus. It is the (a) top view of a diaphragm, (b) III-III sectional view taken on the line. It is (a) perspective view of a cover member, (b) VV sectional view taken on the line.

Explanation of symbols

1 Anti-vibration mount device (liquid-filled anti-vibration device)
2 Case (tubular member)
10 Mount Body 12 Connecting Bracket (Connecting Member)
13 Rubber elastic body (elastic member)
31 Orifice panel 32 Diaphragm (elastic membrane member)
32a Protrusion (protrusion)
32b bulging portion 33 liquid chamber 36 cover member 36a flange 37 annular metal fitting (tubular member)
38 Space 39 Clearance

Claims (4)

A connecting member connected to either the support side or the supported side;
A cylindrical member connected to the other of the support side or the support side;
An elastic member that elastically connects the connecting member and the tubular member and relatively displaces the two members by elastic deformation;
An elastic membrane member that covers an opening of the cylindrical member and defines a liquid chamber filled with liquid in the cylindrical member or the elastic member;
A cover member that covers the elastic membrane member from above while forming a space for allowing deformation of the elastic membrane member between the elastic membrane member,
The elastic membrane member and the cover member are configured so that a gap that communicates the space portion with the outside is formed between both members in a part of the peripheral edge portion to be joined to each other. Type vibration isolator. In claim 1,
A liquid-filled vibration isolator having a plurality of protrusions spaced apart from each other in a circumferential direction at a joint between the elastic film member and the cover member. In any one of Claim 1 or 2,
A bulging portion that bulges outward from the outer surface of the cylindrical member is formed at the peripheral portion of the elastic membrane member, while the peripheral portion of the cover member is engaged with the bulging portion of the elastic film member. A liquid-sealed vibration isolator characterized in that a possible collar is formed. In claim 3,
The tubular member is bent so that the side wall on the elastic membrane member side is curved inward in the radial direction, and the outer side of the curved portion is reduced as the thickness on the tubular member is lowered. A liquid-filled vibration damping device, which is covered with a bulging portion of an elastic film member formed on the surface.

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