JP2007147063A - Partition member for liquid filled vibration control device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a partition member for a liquid filled vibration control device, capable of achieving greatly reduced manufacturing cost with no need for adhesive while securing joint strength between an orifice member and an elastic partition membrane, and to provide its manufacturing method. <P>SOLUTION: The elastic partition membrane having at least one through-hole is molded in a vulcanizing molding process, and the elastic partition membrane is inserted into a resin injection mold in an inserting process so that a portion including the through-hole is located in an injection space. In a resin molding process, a resin material is injected into the injection space of the resin injection mold to mold the orifice member integrally with the elastic partition membrane. Thus, manufacturing cost is greatly reduced with no need for adhesive. Furthermore, a resin material for the orifice member is filled into the through-hole of the elastic partition membrane to form in its filled portion a means for preventing the come-off of the elastic partition membrane from the orifice member, therefore reliably securing joint strength between both members. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a partition member for a liquid-filled vibration isolator and a method for manufacturing the partition member for the liquid-filled vibration-proof device.

  As shown in FIG. 6, a conventional liquid-filled vibration isolator 200 is composed of a first elastic fitting 201 attached to the engine side and a second fitting 202 attached to the vehicle body frame side, which are made of a rubber-like elastic body. A liquid sealing chamber 206 is formed between the diaphragm 205 and the vibration isolating base 203 that are connected by the vibration isolating base 203 and attached to the second fixture 202.

  The liquid sealing chamber 206 is partitioned into a main liquid chamber 206A and a sub liquid chamber 206B by a partition member 207, and the main and sub liquid chambers 206A and 206B are communicated with each other by an orifice 220. As a result, the vibration damping function and the vibration insulating function can be achieved by the fluid flow effect between the main and sub liquid chambers 206A and 206B by the orifice 220 and the vibration damping effect of the vibration isolation base 203.

  Further, as shown in FIG. 6, the partition member 207 includes an orifice member 208 made of a resin material, and an elastic partition film 209 made of a rubber-like elastic body. As described above, the elastic partition membrane 209 divides the main and sub liquid chambers 206A and 206B, and the fluid pressure fluctuation between the two liquid chambers is absorbed by the reciprocating displacement of the elastic partition membrane 209. The low dynamic spring characteristics can be obtained.

  However, in this liquid-filled vibration isolator 200, the partition member 207 is configured by vulcanizing and bonding the elastic partition film 209 and the orifice member 208. Therefore, in the manufacturing process of the orifice member 207, an adhesive coating process and a drying process are required, and there is a problem that the manufacturing cost increases accordingly.

  In addition, due to the structure in which the bonded portion is immersed in the liquid, there is a problem that the liquid easily enters the bonded portion interface with the reciprocating displacement of the elastic partition film 209, and the bonded portion is easily peeled off. Therefore, it is necessary to use a liquid-resistant and heat-resistant adhesive in order to ensure the reliability of the bonded portion against peeling, and there is a problem that the material cost increases accordingly. Further, the resin material that can be used for the orifice member 208 is limited to a material that can ensure adhesiveness, and there is a problem that the selection range is narrowed.

Therefore, a structure that does not require an adhesive has been proposed. For example, in Japanese Patent Laid-Open No. 5-248479, an orifice member is made of a thermoplastic resin and divided into an outer member 84 and an inner member 88, and the outer peripheral edge of the rubber plate 94 is interposed between these members 84 and 88. A technique for manufacturing the partition member 40 (partition member for liquid-filled vibration isolator) by integrating the mating surfaces of the members 84 and 88 by ultrasonic welding after being sandwiched is described. According to this technique, since the rubber plate 94 is held between the members 84 and 88, no adhesive is required.
Japanese Patent Laid-Open No. 5-248479 (for example, paragraphs [0047], [0050], FIG. 6 to FIG. 9)

  However, in the technique of dividing the orifice member into two parts as described above, the injection molding process in which each of the two divided parts 84 and 88 is injection-molded, and the assembly process in which the rubber plate 94 is sandwiched between the respective members 84 and 88 and assembled. In addition, a process called a welding process for welding the unit assembled in the assembly process by the ultrasonic transmission means is required, and there is a problem that the equipment cost and the work cost are extremely increased.

  In addition, it is necessary to select a resin material suitable for ultrasonic welding, and there is a problem that the selection range of the resin material is narrowed accordingly. Further, since the orifice member is divided into two parts, it is necessary to injection-mold each of the members 84 and 88, and the number of resin injection molds to be taken is reduced, resulting in an increase in molding cost.

  The present invention has been made in order to solve the above-described problems, and achieves a significant reduction in the manufacturing cost by eliminating the need for an adhesive while ensuring the bonding strength between the orifice member and the elastic partition membrane. It is an object of the present invention to provide a partition member for a liquid-filled vibration isolator and a method for manufacturing the partition member for the liquid-filled vibration-proof device.

  In order to achieve this object, the method for manufacturing a partition member for a liquid-filled vibration isolator according to claim 1 divides a liquid-filled chamber into which a liquid is filled into a main liquid chamber and a sub-liquid chamber. An elastic partition membrane that is disposed at a position to relieve a hydraulic pressure difference between the main and sub liquid chambers, and an orifice member that forms an orifice that communicates the main and sub liquid chambers partitioned by the elastic partition membrane, The orifice member is made of a resin material and the elastic partition membrane is made of a rubber-like elastic body. A vulcanization molding step for vulcanizing and molding the elastic partition membrane into the formed substantially disk shape, and a portion including at least the through hole of the elastic partition membrane vulcanized and molded by the vulcanization molding step is the orifice member of An insertion step of inserting the elastic partition membrane into the resin injection mold so as to be located in an injection space having a shape, and the resin injection mold in which the elastic partition membrane is inserted by the insertion step A resin molding step of injecting a resin material into the injection space and molding the orifice member integrally with the elastic partition membrane, and filling the through hole of the elastic partition membrane with the resin material of the orifice member The filling portion forms a means for preventing the elastic partition film from coming off from the orifice member.

  The method for producing a partition member for a liquid-filled type vibration isolator according to claim 2 is the method for producing a partition member for a liquid-filled type vibration-proof device according to claim 1, wherein the vulcanization molding step comprises: The elastic partition membrane is vulcanized and molded into a substantially disk shape having a larger diameter than the outer diameter of the side surface of the orifice member, and the insert step is performed on the side surface of the orifice member by the vulcanization molding step. The outer peripheral portion of the elastic partition film formed to have a larger diameter than the outer diameter is held by the holding portion of the resin injection mold.

  The method for producing a partition member for a liquid-filled vibration isolator according to claim 3 is the method for producing a partition member for a liquid-filled vibration-proof device according to claim 1 or 2. In the vulcanization molding process, the vulcanization molding process adds the elastic partition membrane so that at least a part of the portion embedded in the orifice member is thicker than the membrane portion for reducing the hydraulic pressure fluctuation. It is to be vulcanized.

  The partition member for a liquid filled type vibration isolator according to claim 4 is manufactured by the manufacturing method according to any one of claims 1 to 3.

  According to the method for manufacturing a partition member for a liquid-filled vibration isolator according to claim 1, the elastic partition film molded in the vulcanization molding process is inserted into the resin injection mold in the insert process, and the orifice in the resin molding process By molding the member integrally with the elastic partition membrane, the partition member for the liquid filled type vibration isolator can be manufactured.

  Therefore, unlike the conventional product manufactured by vulcanizing and bonding the elastic partition membrane and the orifice member, an adhesive application process and a drying process are not required, so the work process can be simplified. Accordingly, there is an effect that the work cost can be greatly reduced.

  Further, since no adhesive is required, there is an effect that the material cost can be reduced accordingly. Similarly, since there is no adhesive part due to the adhesive, there is an effect that the problem that the adhesive part is peeled off can be solved and the reliability can be improved. Furthermore, since it is not necessary to consider the adhesiveness between the adhesive and the resin material, there is an effect that the selection range of the resin material is expanded.

  On the other hand, it is not necessary to divide the orifice member into two parts and perform injection molding on each other, unlike the conventional product in which the elastic partition membrane is narrowed by the orifice member divided into two and integrated by ultrasonic welding. There is an effect that the injection space of the mold can be efficiently used, and the number of pieces can be increased accordingly.

  In addition, unlike the conventional product, there is no need for an assembly process in which an elastic partition membrane is sandwiched between two divided orifice members and a welding process in which units assembled by the assembly process are ultrasonically welded. The production facility can be simplified, and the work cost and the facility cost can be significantly reduced accordingly.

  According to the manufacturing method of the present invention, the resin material of the orifice member can be filled in the through hole of the elastic partition membrane, and the elastic partition membrane can be prevented from coming off from the orifice member at the filling portion. Therefore, since sufficient bonding strength between the orifice member and the elastic partition membrane can be obtained, there is an effect that dynamic characteristics and durability performance can be surely ensured.

  According to the method for producing a partition member for a liquid-filled type vibration isolator according to claim 2, in addition to the effect exhibited by the method for producing the partition member for a liquid-filled type vibration-proof device according to claim 1, The elastic partition membrane is vulcanized and molded into a substantially disk shape having a larger diameter than the outer diameter of the side surface of the orifice member. Therefore, in the insert process, the outer peripheral part of the elastic partition film can be held by the holding part of the resin injection mold, so that the elastic partition film can be positioned with higher accuracy. As a result, the position accuracy of the elastic partition film with respect to the orifice member can be increased, and accordingly, the effect of being able to manufacture a partition member for a liquid-filled vibration isolator that ensures dynamic characteristics and durability performance. is there.

  According to the method for producing a partition member for a liquid-filled type vibration isolator according to claim 3, in addition to the effect exhibited by the method for producing the partition member for a liquid-filled type vibration-proof device according to claim 1 or 2, vulcanization molding In the process, the elastic partition membrane is vulcanized and molded so that at least a part of the portion embedded in the orifice member is thicker than the membrane portion for relaxing the hydraulic pressure fluctuation. That is, the elastic partition membrane is molded so that the portion located in the injection space in the insert process is thicker, so that the amount of resin material injected into the injection space in the resin molding process is reduced. The material cost can be reduced accordingly.

  According to the partition member for a liquid filled type vibration isolator according to claim 4, the same as the partition member for a liquid filled type vibration isolator manufactured by the manufacturing method according to any one of claims 1 to 3. The effect of.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a liquid-filled vibration isolator 100 according to one embodiment of the present invention.

  This liquid-filled vibration isolator 100 is a vibration isolator for supporting and fixing an automobile engine so as not to transmit the engine vibration to the vehicle body frame, and is attached to the engine side as shown in FIG. A first mounting bracket 1, a cylindrical second mounting bracket 2, and a vibration isolating base 3 that connects both the brackets 1 and 2 and is made of a rubber-like elastic body are mainly provided.

  As shown in FIG. 1, the first mounting bracket 1 is made of an aluminum alloy in a substantially cylindrical shape, and the upper end surface (upper side surface in FIG. 1) has a female thread portion 11 directed downward (downward in FIG. 1). It is recessed. Further, a flange-like stoppered portion 12 is formed projecting outward in the radial direction at a substantially intermediate portion in the longitudinal direction (the vertical direction in FIG. 1) of the first mounting bracket 1.

  As shown in FIG. 1, the second mounting bracket 2 is formed in a cylindrical shape having upper and lower ends (upper and lower sides in FIG. 1) opened from a steel material. The second mounting bracket 2 is configured to have a step, the upper side of the step (upper side in FIG. 1) is a large diameter cylindrical portion 2a, and the lower side of the step (lower side in FIG. 1) is a small diameter cylinder. Part 2b.

  As shown in FIG. 1, the vibration isolator base 3 is formed from a rubber-like elastic body in a substantially truncated cone shape, and has a lower end side (lower side in FIG. 1) of the first mounting bracket 1 and an upper end of the second mounting bracket 2 ( It is vulcanized and bonded between the inner periphery of the upper side in FIG.

  As shown in FIG. 1, a stopper rubber portion 31 that covers the stopper portion 12 of the first mounting bracket 1 is connected to the upper end portion (upper side of FIG. 1) of the vibration isolating base 3, and this stopper rubber portion 31 Is configured to obtain a stopper action at the time of large displacement by abutting against a stopper metal fitting 4 described later.

  On the other hand, as shown in FIG. 1, a rubber film 32 covering the inner peripheral surface of the second mounting bracket 2 is connected to the lower end portion (lower side in FIG. 1) of the vibration isolating base 3. An orifice forming wall 81 of the orifice member 8 to be described later and an attachment fitting 51 of the diaphragm 5 are in close contact with each other.

  As shown in FIG. 1, a stopper fitting 4 is press-fitted into the upper end portion (large diameter cylindrical portion 2a) of the second mounting fitting 2. As described above, the stopper fitting 4 is a member for restricting the displacement of the stopper rubber portion 31 to obtain a stopper action, and is configured in a substantially cup shape from a steel material.

  As shown in FIG. 1, a liquid drain hole 41 is formed in the side surface of the stopper fitting 4. The liquid drain hole 41 is a discharge hole for discharging the liquid stored in the inner peripheral space of the stopper fitting 4 and is a height that substantially coincides with the upper edge (the upper side in FIG. 1) of the second mounting fitting 2. It is open. When liquid is stored in the inner peripheral space of the stopper fitting 4 during the assembly process or traveling of the liquid-filled vibration isolator 100, the liquid is discharged to the outside through the liquid drain hole 41. The

  As shown in FIG. 1, the diaphragm 5 is formed from a rubber-like elastic body into a rubber film shape having a partial spherical shape, and the lower end of the second mounting bracket 2 (small-diameter cylindrical portion 2b) (lower side in FIG. 1) ) Is attached. As a result, a liquid sealing chamber 6 is formed between the upper surface side of the diaphragm 5 and the lower surface side of the vibration isolating base 3.

   The liquid enclosure 6 is filled with an antifreeze liquid (not shown) such as ethylene glycol. Further, as shown in FIG. 1, the liquid sealing chamber 6 includes a main liquid chamber 6A on the side of the vibration isolating base 3 (upper side in FIG. 1) and a diaphragm by a partition member 7 (orifice member 8 and elastic partition film 9) described later. It is divided into two chambers, a secondary liquid chamber 6B on the 5 side (lower side in FIG. 1).

  The diaphragm 5 is vulcanized and bonded to a donut-shaped mounting bracket 51 when viewed from above, and as shown in FIG. 1, the lower end of the second mounting bracket 2 (the lower side in FIG. 1) ) Is attached.

  As shown in FIG. 1, the partition member 7 divides the liquid sealing chamber 6 into a main liquid chamber 6A and a sub liquid chamber 6B, an orifice member 8 configured in a substantially cylindrical shape from a resin material, and a rubber-like member And an elastic partition membrane 9 configured in an approximately disc shape from an elastic body. The elastic partition membrane 9 is disposed at a position that partitions the main and sub liquid chambers 6A and 6B.

  As a result, when a relatively small amplitude is input, the elastic partition membrane 9 is reciprocally displaced, thereby reducing the hydraulic pressure difference between the liquid sealing chambers 6 (main and auxiliary liquid chambers 6A and 6B), Low dynamic spring characteristics can be obtained.

  Here, the partition member 7 is configured by insert molding of the orifice member 8 and the elastic partition film 9. Therefore, an adhesive for vulcanizing and bonding the members 8 and 9 as in the conventional product is not required. Further, the partition member 7 is provided with means for preventing the elastic partition film 9 from coming off from the orifice member 8, so that the joint strength between the members 8 and 9 is sufficiently secured. The detailed configuration of the drop prevention means will be described later.

  As shown in FIG. 1, orifice forming walls 81 and 82 are respectively formed on the upper and lower ends (upper and lower sides of FIG. 1) of the orifice member 8 so as to project outward in the radial direction. An orifice 20 is formed between the opposing surfaces of the walls 81 and 82 (that is, between the outer peripheral surface side of the orifice member 8 and the inner peripheral surface side (rubber film 32) of the second mounting member 2). The orifice 20 is an orifice channel that communicates the main liquid chamber 6A and the sub liquid chamber 6B.

  Note that the orifice 20 communicates with the main liquid chamber 6A via a notch 81a (see FIG. 3) formed in the upper orifice forming wall 81 (see FIG. 3). The sub liquid chamber 6B is communicated with through an opening 85 (see FIG. 3) formed through the side surface.

  Here, the assembly of the liquid-filled vibration isolator 100 is performed by first fitting the partition member 7 and the diaphragm 5 in order from the lower end side (lower side in FIG. 1) of the second mounting bracket 2 and then the second mounting bracket. This is performed by reducing (drawing) the entire two small-diameter cylindrical portions 2b in the radial direction (left-right direction in FIG. 1).

   The drawing process is performed using a drawing die having a plurality of movable die blades. Specifically, the plurality of drawing operations are performed so as to surround the entire outer peripheral surface of the small-diameter cylindrical portion 2b of the second mounting bracket 2. By arranging the die blade and moving the die blade toward the center, the entire small diameter cylindrical portion 2b is uniformly reduced in the radial direction.

  As a result, as shown in FIG. 1, the partition member 7 (orifice member 8) is provided with a partition body receiving portion 33 provided on the vibration isolation base 3 and the diaphragm 5 so that the axial direction ( It is clamped and fixed in the vertical direction of FIG. Note that the partition body receiving portion 33 is formed as a step portion at a plurality of locations on the lower surface side of the vibration isolating base 3, and receives the upper end surface (upper side surface in FIG. 1) of the orifice member 8 by the step portion.

  Here, in this assembled state, the partition body receiving portion 33 is compressed and deformed, and the elastic restoring force of the partition body receiving portion 33 is applied to the upper end surface of the partition member 7 as a holding force of the partition member 7. Yes. As a result, even when a large amplitude or a high frequency amplitude is input, the partition member 7 is firmly and stably held and fixed, and the influence on the dynamic characteristics due to the positional deviation or resonance of each member Can be avoided.

  Next, the partition member 7 will be described with reference to FIGS. FIG. 2 (a) is a top view of the partition member 7, and FIG. 2 (b) is a cross-sectional view of the partition member 7 taken along line IIb-IIb in FIG. 2 (a). FIG. 3 is a side view of the partition member 7 as seen from the direction of arrow A in FIG.

  As described above, the partition member 7 includes the orifice member 8 and the elastic partition film 9, and both the members 8 and 9 are integrated by insert molding. A method for manufacturing the partition member 7 will be described later.

  As shown in FIGS. 2 and 3, the orifice member 8 is formed in a substantially cylindrical shape having an axis O from a resin material. At the upper and lower ends in the axial direction of the orifice member 8 (upper and lower sides in FIG. 2 (b)), substantially flange-shaped orifice forming walls 81 and 82 are formed to project outward in the radial direction. The aforementioned orifice 20 is formed between the opposed surfaces of the orifice forming walls 81 and 82 (see FIG. 1).

  As shown in FIG. 2 (a) and FIG. 3, the upper orifice-forming wall is formed with a notch 81a having a substantially U-shape as viewed from above. The notch 81a is an opening functioning as an orifice inlet / outlet, and the orifice 20 communicates with the main liquid chamber 6A via the notch 81a as described above.

  Further, as shown in FIG. 3, a vertical wall 83 extending in the axial center O direction (the vertical direction in FIG. 3) is formed to project outward in the radial direction at one place on the side surface of the orifice member 8. The vertical wall 83 defines the orifice 20 (see FIG. 1). The overhanging dimension of the vertical wall 83 is substantially the same as that of the orifice forming walls 81 and 82.

  As shown in FIGS. 2 and 3, an opening 85 is formed through the side surface of the orifice member 8 and on the side of the vertical wall 83. The opening 85 functions as an orifice entrance / exit, and the orifice 20 is communicated with the sub liquid chamber 6B through the opening 85 as described above.

  As shown in FIG. 2, a support wall 86 is formed on the inner peripheral side of the orifice member 8 so as to protrude radially inward. In the support wall 86, the peripheral edge of the elastic partition membrane 9 is embedded. The wall 86 is formed thicker than the body of the orifice member 8 and the wall thickness of the orifice forming walls 81 and 82. Therefore, in the resin injection process to be described later, the flow space of the resin material can be secured and the resin material can be reliably filled in the injection space, so that the yield can be improved.

  The elastic partition membrane 9 is formed of a rubber-like elastic body in a substantially disc shape, and the peripheral edge thereof is embedded in the orifice member 8 as shown in FIG. Thus, the elastic partition membrane 9 is disposed at a position that divides the liquid sealing chamber 6 into the main and sub liquid chambers 6A and 6B. Here, the detailed configuration of the elastic partition film 9 will be described with reference to FIG.

   4 (a) is a top view of the elastic partition membrane 9, and FIG. 4 (b) is a cross-sectional view of the elastic partition membrane 9 taken along the line IVb-IVb in FIG. 4 (a).

  As shown in FIG. 4, the elastic partition membrane 9 is a rubber membrane configured from a rubber-like elastic body in a substantially disc shape having an axis P, and as described above, the peripheral portion thereof is in the orifice member 8. By being embedded (see FIG. 2), it is disposed at a position that divides the main liquid chamber 6A and the sub liquid chamber 6B (see FIG. 1), and alleviates the hydraulic pressure difference between the main and sub liquid chambers 6A and 6B. Demonstrate the function.

  In the film portion 91 of the elastic partition membrane 9, as shown in FIG. 4, a plurality (12 in this embodiment) of through-holes 92 are provided in the plate thickness direction (see FIG. (a) Perforated in the direction perpendicular to the paper surface. As will be described later, the through-hole 92 is filled with a resin material constituting the orifice member 8, thereby forming a means for preventing the elastic partition film 9 from coming off from the orifice member 8.

  In the present embodiment, as shown in FIG. 4, the cross-sectional shape of the through-hole 92 is formed in a substantially circular shape, and each through-hole 92 is approximately equally spaced in the circumferential direction (approximately every 30 degrees). It is arranged. Thereby, when the elastic partition film 91 is reciprocally displaced, the load on each through-hole 92 can be reduced and equalized, and durability can be improved.

  A thick portion 93 is formed in a substantially annular shape at the peripheral edge of the elastic partition membrane 9. This thick portion 93 is a portion embedded in the orifice member 8 together with the above-described through hole 92 (see FIG. 2). Since the thickness dimension of the thick portion 93 (Fig. 4 (b) vertical thickness) is configured to be thicker than the membrane portion 91, the amount of resin material that constitutes the orifice member 8 is reduced accordingly. Less material costs can be achieved.

  Further, by forming the thick part 93 thicker than the film part 91, a step can be formed at the boundary between the film part 91 and the thick part 93. As a result, when the elastic partition membrane 9 is reciprocally displaced, such a step (inner peripheral surface of the thick portion 93) can function as a means for preventing the elastic partition membrane 9 from coming off from the orifice member 8, and Thus, the load on the through hole 92 and the resin filled in the through hole 92 can be reduced.

  Here, the elastic partition membrane 9 is formed so that its outer diameter dimension Dr is larger than the outer diameter dimension Do (see FIG. 2 (b)) on the side surface of the orifice member 8, and the outer peripheral side of the thick wall portion 93 is the orifice member. It is configured to protrude from the side surface of 8 (see FIGS. 2 and 3). Thereby, in the insert step described later, the outer peripheral side of the thick portion 93 can be held by the holding portions 73a and 74a of the resin injection mold 70, so that the elastic partition film 9 is positioned with higher accuracy. (See FIG. 5).

  Next, a method for manufacturing the partition member 7 will be described with reference to FIG. FIG. 5 is a schematic view schematically showing a cross section of the resin injection mold 70.

  When manufacturing the partition member 7, first, in the vulcanization molding step, the elastic partition membrane 9 is vulcanized into the shape described above (see FIG. 4). After the elastic partition membrane 9 is vulcanized and molded in the vulcanization molding process, the process proceeds to the insert process.

  In the inserting step, as shown in FIG. 5, the elastic partition membrane 9 is inserted into the resin injection mold 70. Thereby, the through hole 92 and the thick portion 93 (see FIG. 4) of the elastic partition membrane 9 are arranged in the injection space 75.

The resin injection mold 70 includes a lower mold 71, an upper mold 72, and slide molds 73 and 74.
By closing the mold 74, an injection space 75 that matches the shape of the orifice member 8 described above is formed.

  As shown in FIG. 5, the slide dies 73 and 74 include holding portions 73a and 74a that are formed to have a U-shaped cross section. The thick portions 93 of the elastic partition film 9 are formed by the holding portions 73a and 74a. Hold. As a result, positioning of the elastic partition membrane 9 can be performed with higher accuracy, and the positional accuracy of the elastic partition membrane 9 with respect to the orifice member 8 can be increased, and the partition member 7 that ensures dynamic characteristics and durability performance is manufactured. be able to.

  After the elastic partition film 9 is inserted into the resin injection mold 70 by the insert process, the process proceeds to the resin molding process. In the resin molding step, the resin material is injected into the injection space 75 from the state shown in FIG. 5 via the gate 72a, and the orifice member 8 is molded integrally with the elastic partition film 9 (insert molding).

  In this case, the elastic partition membrane 9 is inserted into the resin injection mold 70 so that the through hole 92 is located in the injection space 75 in the above-described insert process. Can be filled in the through-hole 92, and a means for preventing the elastic partition film 9 from coming off from the orifice member 8 can be formed at the filled portion. Therefore, sufficient bonding strength between the orifice member 8 and the elastic partition membrane 9 can be obtained, and as a result, dynamic characteristics and durability can be reliably ensured.

  Here, as described above, since the through hole 92 is formed at a position in contact with the thick wall portion 93 (see FIG. 4), it is possible to prevent the narrow space portion from being formed in the injection space 75, and As well as ensuring fluidity, it is possible to avoid the occurrence of stress concentration. As a result, the yield can be improved.

  After the orifice member 8 and the elastic partition film 9 are integrally molded (insert molding) by the resin molding process, the molded product is taken out from the resin injection mold 70, and the manufacture of the partition member 7 is completed.

  Thus, according to the manufacturing method of the present invention, the partition member 7 is manufactured by insert-molding the orifice member 8 and the elastic partition membrane 9, so that the conventional product in which the elastic partition membrane and the orifice member are vulcanized and bonded together. As described above, an adhesive application step, a drying step, and the like are not required. As a result, the work process can be simplified and the work cost can be greatly reduced.

  Further, since the adhesive is not required, the material cost can be reduced correspondingly, and the problem that the bonded portion is peeled off can be solved and the reliability can be improved. Furthermore, since it is not necessary to consider the adhesiveness between the adhesive and the resin material, the selection range of the resin material can be expanded.

  In addition, according to the manufacturing method of the present invention, it is also necessary to divide the orifice member into two parts and perform injection molding as in the conventional product in which the elastic partition membrane is sandwiched between the two divided orifice members and integrated by ultrasonic welding. Absent. Therefore, the injection space 75 can be efficiently formed in the resin injection mold 70, and the number of the injection spaces can be increased.

  Also, unlike the conventional product, there is no need for an assembly process in which an elastic partition film is sandwiched between two orifice members, and a welding process in which units assembled by the assembly process are ultrasonically welded. Equipment can be simplified, and work costs and equipment costs can be significantly reduced accordingly.

  The present invention has been described above based on the embodiments. However, 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. It can be easily guessed.

  For example, in the above-described embodiment, the case where the shape of the through-hole 92 is formed to have a circular cross section has been described. However, the shape is not necessarily limited to this, and other shapes are naturally possible. For example, a long hole shape along the thick portion 93 (that is, a shape obtained by radially dividing an annular hole along the circumferential direction) is exemplified.

  In the above embodiment, the through-hole 92 has been described as an example of a component of the elastic partition membrane 9 removal prevention means. However, the present invention is not necessarily limited to this. For example, at least one side of the elastic partition membrane 9 is used. It may be a concave portion or a convex portion provided on the surface.

  That is, if the recess is a recess, the recess is filled with the resin material of the orifice member 8, and if the recess is a recess, the protrusion is surrounded by the resin material of the orifice member 8. A means for preventing the film 9 from coming off can be configured.

[Industrial applicability]
It is possible to eliminate the need for an adhesive while securing the bonding strength of the partition member for a liquid-filled vibration isolator composed of an orifice member made of a resin material and an elastic partition film made of a rubber-like elastic material.

1 is a cross-sectional view of a liquid filled type vibration isolator according to an embodiment of the present invention. (a) is a top view of the partition member, and (b) is a cross-sectional view of the partition member taken along line IIb-IIb in FIG. 2 (a). FIG. 3 is a side view of the partition member viewed from the direction of arrow A in FIG. 2 (a). (a) is a top view of the elastic partition membrane, and (b) is a cross-sectional view of the elastic partition membrane taken along line IVb-IVb in FIG. 4 (a). It is the schematic diagram which showed typically the cross section of the metal mold | die for resin injection. It is sectional drawing of the conventional liquid enclosure type vibration isolator.

Explanation of symbols

100 liquid filled vibration isolator
6 Liquid enclosure
6A Main liquid chamber
6B Secondary liquid chamber
7 Partition member (Partition member for liquid-filled vibration isolator)
8 Orifice member
9 Elastic partition membrane
91 Membrane
92 Through hole
93 Thick part
20 Orifice
70 Resin injection mold
73a, 74a Holding part
75 Injection space
Do Outer diameter on side of orifice member
Dr Outer diameter of elastic partition membrane

Claims (4)

An elastic partition membrane that is disposed at a position that divides a liquid sealing chamber into which a liquid is sealed into a main liquid chamber and a sub liquid chamber and that relaxes the hydraulic pressure difference between the main and sub liquid chambers, and is partitioned by the elastic partition membrane And an orifice member that forms an orifice that allows the main and sub liquid chambers to communicate with each other. The orifice member is made of a resin material, and the elastic partition membrane is made of a rubber-like elastic body. In the manufacturing method of the partition member for
A vulcanization molding step of vulcanizing and molding the elastic partition membrane into a substantially disc shape in which at least one or more through-holes are formed in the peripheral portion;
The elastic partition membrane is placed on the resin injection mold so that at least a portion including the through hole of the elastic partition membrane vulcanized and formed by the vulcanization molding step is located in an injection space having the shape of the orifice member. An insert process for inserting into the mold;
A resin molding step of injecting a resin material into an injection space of the resin injection mold in which the elastic partition membrane is inserted by the insert step, and molding the orifice member integrally with the elastic partition membrane;
A liquid-filled vibration isolator comprising filling the resin material of the orifice member into a through-hole of the elastic partition membrane and forming a means for preventing the elastic partition membrane from coming off from the orifice member at the filled portion. A method for manufacturing a partition member.   In the vulcanization molding step, the elastic partition membrane is vulcanized and molded into a substantially disk shape having a larger diameter than the outer diameter of the side surface of the orifice member, and the insert step is performed by the vulcanization molding step. The first aspect of the present invention is that the outer peripheral portion of the elastic partition film formed to have a larger diameter than the outer diameter dimension on the side surface of the orifice member is held by a holding portion of the resin injection mold. The manufacturing method of the partition member for liquid enclosure type vibration isolators of description.   The vulcanization molding step vulcanizes and molds the elastic partition membrane so that at least a part of the portion embedded in the orifice member is thicker than the membrane portion for relaxing the hydraulic pressure fluctuation. 3. A method for manufacturing a partition member for a liquid-filled type vibration damping device as defined in claim 1 or claim 2, wherein   A partition member for a liquid-filled vibration isolator, which is manufactured by the manufacturing method according to any one of claims 1 to 3.

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