JP2016080056A - Liquid sealed type vibration-proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid sealed type vibration-proof device capable of increasing a degree of freedom in design in a short-circuited path while restricting a product cost.SOLUTION: An end surface in a peripheral direction of an orifice forming member 50 is provided with a recessed groove 62. Thus, end surfaces of a pair of orifice forming members 50 in their peripheral directions are abutted to each other under attitude in which they are reversed upside-down, the short-circuited paths for communicating orifices can be formed by recessed groove 62. As a result, a structure of molding die does not become complex as found in the prior art product and the recessed groove 62 can be molded by mold. Post-processing with a drill or pressing of another member becomes unnecessary. With this arrangement, it is possible to reduce product cost. In addition, it is optionally possible to set a shape of the recessed groove 62. Accordingly, it is possible to increase a degree of freedom in design of the short-circuited paths.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a liquid-filled vibration isolator, and more particularly to a liquid-filled vibration isolator that can increase the degree of freedom in designing a short-circuit path while suppressing product cost.

  As a liquid-filled vibration isolator used in an automobile, Patent Document 1 discloses a plurality of fluid chambers (liquid chambers) inside a first mounting member 12 and a second mounting member 16 connected by a rubber-like elastic body 28. And an orifice passage 44 that allows fluid flow between the fluid chambers, and a short-circuit path 46 that directly connects the opening portions at both ends of the orifice passage 44 are disclosed.

  Further, in Patent Document 2, a partition fitting 17 is press-fitted into the orifice fitting 16, and between the two ends of the orifice 25 between the end surface portion 23 a 1 of the first vertical wall 23 a of the orifice fitting 16 and the lower surface of the partition fitting 17. What provided the short circuit path | route SC which connects is disclosed.

  According to the techniques disclosed in these Patent Documents 1 and 2, when a relatively small amplitude is input, the fluid flows through the short-circuit paths 46 and SC, thereby reducing the flow rate of the orifices (orifice passage 46 and orifice 25). Thus, while the dynamic spring constant can be reduced, when a relatively large amplitude is input, the flow amount of the orifice (orifice passage 46, orifice 25) can be secured and a high damping effect can be exhibited.

Japanese Laid-Open Patent Publication No. 04-203631 (for example, the upper left, second to ninth lines on page 6, FIG. 6) No. 2005-106283 (for example, page 9, line 11 to line 13, FIG. 7)

  However, in the technique of Patent Document 1 described above, the short circuit path 46 is formed as a through hole that communicates with the partition wall 88 of the partition member 72. Therefore, when the partition member 72 is molded, there is a problem that the structure of the molding die becomes complicated and the product cost increases accordingly. In this case, even if the through hole is formed by cutting with a drill after the partition member 72 is molded, the number of steps is increased and the number of steps is increased, resulting in an increase in product cost.

  Further, in the technique of Patent Document 2 described above, since the short-circuit path SC is formed by press-fitting the partition fitting 17 into the orifice fitting 16, the partition fitting 17 is required in addition to the orifice fitting 16, and the parts As the number of points increases, the man-hours increase by the press-fitting process, resulting in an increase in product cost.

  Furthermore, in the technique of Patent Document 1 described above, the short circuit path 46 is formed of a through-hole, and in the technique of Patent Document 2, the space between the opposing surfaces of the first standing wall 23a and the partition fitting 17 is the short circuit path SC. The short-circuit paths 46 and SC are limited to a linear shape, and there is a problem that the degree of freedom in design is low.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a liquid-filled vibration isolator capable of increasing the degree of freedom in designing a short-circuit path while suppressing product cost. Yes.

Means for Solving the Problems and Effects of the Invention

  According to the liquid-filled vibration isolator according to claim 1, since the recessed groove is formed in the circumferential end surface of at least one of the orifice forming members, the pair of orifice forming members. By forming a state in which the circumferential end faces of each other are abutted with each other, a short-circuit path is formed between the circumferential end faces so that the orifices communicate with each other or the orifice and the liquid chamber communicate with each other. be able to. Therefore, in the case of molding, the structure of the molding die can be simplified, and the mold structure does not become complicated unlike conventional products. Further, in the case of molding, post-processing with a drill or press-fitting of another member is not required. As a result, the product cost can be reduced.

  Moreover, since the recessed groove is recessed in the circumferential end surface of the orifice forming member, the shape of the recessed groove can be arbitrarily set using the circumferential end surface. Therefore, the freedom degree of design of a short circuit path | route can be raised.

  According to the liquid-filled vibration isolator of claim 2, in addition to the effect exhibited by the liquid-filled vibration isolator of claim 1, the first recessed groove is formed in the end face of one orifice forming member. In addition, when the second recessed groove is formed in the end surface of the other orifice forming member and the end surface of the one orifice forming member and the end surface of the other orifice forming member are in contact with each other, Since the end side and the other end side of the second recessed groove are overlapped and a short circuit path is formed by the first recessed groove and the second recessed groove, the end surfaces are overlapped in the middle of the short circuit path. A portion bent in the direction can be formed. As a result, when a relatively large amplitude is input, the liquid can hardly flow through the short-circuit path, and the flow amount of the orifice can be ensured accordingly, so that the damping effect can be enhanced.

  According to the liquid-filled vibration isolator according to claim 3, in addition to the effect exerted by the liquid-filled vibration isolator according to claim 2, at least one of the first recessed groove or the second recessed groove has one end and Since at least one portion between the other end is bent, the end face can be formed in the short-circuit path in addition to the end face bent in the overlapping direction. As a result, when a relatively large amplitude is input, the liquid can hardly flow through the short-circuit path, and the flow amount of the orifice can be secured correspondingly, so that the damping effect can be further enhanced.

  According to the liquid-filled vibration isolator of claim 4, in addition to the effect exhibited by the liquid-filled vibration isolator of claim 2, the first recessed groove and the second recessed groove have one end and the other end. Since the gap extends linearly, the shapes of the first concave groove and the second concave groove can be simplified, and the yield in manufacturing the orifice forming member can be improved accordingly. In this case, in a state where the end face of one orifice forming member and the end face of the other orifice forming member are abutted, the extending direction of the first recessed groove and the extending direction of the second recessed groove are viewed from the front of the end face. Since the direction is set to a different direction, it is possible to make it difficult for the liquid to flow through the short-circuit path by using the change in the extending direction. That is, the liquid can hardly flow through the short-circuit path when a relatively large amplitude is input. Therefore, since the flow amount of the orifice can be ensured accordingly, the damping effect can be further enhanced.

  According to the liquid-filled vibration isolator according to claim 5, in addition to the effect exerted by the liquid-filled vibration isolator according to any one of claims 2 to 4, one orifice forming member and the other orifice forming member Are formed in the same shape as each other, so that the end surfaces of the first recessed groove and the second side of the first recessed groove are aligned with each other in a posture in which the directions of the one side and the other side in the axial direction are opposite to each other. A short circuit path can be formed by overlapping the other end of the recessed groove. Therefore, compared with the case where the pair of orifice forming members is composed of two types of orifice forming members having different shapes, the number of parts can be reduced, and the product cost can be reduced correspondingly. Further, when the pair of orifice forming members is composed of two types of orifice forming members having different shapes, one of the two types of orifice forming members is combined and assembled as a pair of orifice forming members. According to the present invention, it is possible to avoid the occurrence of such an incorrect assembly.

  According to the liquid-filled vibration isolator according to claim 6, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 1, the end surface of one of the orifice forming members is recessed. The groove is recessed, and the end surface of the other orifice forming member of the pair of orifice forming members is not formed with a recessed groove, and the first recessed groove has one end and the other end of the one end. Since it is connected to the outer edge of the end face of the orifice forming member, a short-circuit path can be formed only by the recessed groove of one of the orifice forming members.

  Here, for example, when one concave forming groove of one orifice forming member and the concave groove of the other orifice forming member are connected to form one short-circuit path, the two concave grooves are at positions where they can be connected. Therefore, it is necessary to ensure the accuracy of the formation position of each recessed groove and the assembly accuracy of the pair of orifice forming members. On the other hand, according to the present invention, it is not necessary to consider the connection between the recessed grooves, and accordingly, the accuracy of the formation position of the recessed grooves and the assembly accuracy of the pair of orifice forming members are moderated accordingly. Can do. As a result, the product cost can be reduced.

  In addition, for example, when one concave forming groove of one orifice forming member and the concave groove of the other orifice forming member are connected to form one short-circuit path, vibration during running and deterioration with time of the vibration-proof base As a result, when the relative position of the pair of orifice forming members is displaced, the connection state between one recessed groove and the other recessed groove (that is, the state of the short-circuit path) changes, and dynamic May affect other characteristics. On the other hand, according to the present invention, even if a positional shift occurs between the relative positions of the pair of orifice forming members, the state of the short-circuit path is hardly changed, and the dynamic characteristics can be suppressed from being affected.

  According to the liquid filled type vibration isolator of claim 7, in addition to the effect exhibited by the liquid filled type vibration isolator of claim 6, the recessed groove is bent at least at one point between one end and the other end. Therefore, it can be formed in a short circuit path having a bent portion. As a result, when a relatively large amplitude is input, the liquid can hardly flow through the short-circuit path, and the flow amount of the orifice can be secured correspondingly, so that the damping effect can be further enhanced.

  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 any one of claims 1 to 7, the pair of orifice forming members is formed by casting or injection molding. Since it is formed, the product cost can be reduced.

(A) is a top view of the liquid enclosure type vibration isolator in 1st Embodiment, (b) is a front view of a liquid enclosure type vibration isolator. (A) is sectional drawing of the liquid-filled type vibration isolator in the IIa-IIa line of FIG. 1 (a), FIG.2 (b) is a liquid-filled type vibration isolator in the IIb-IIb line of FIG. It is sectional drawing. FIG. 3 is a cross-sectional view of the liquid-filled vibration isolator taken along line III-III in FIG. It is a perspective view of an orifice formation member. (A) is an expanded sectional view in the Va section of Drawing 2 (b), and (b) is an expanded sectional view in the Vb-Vb line of Drawing 5 (a). (A) is a side view of a molded object, (b) is a front view of a molded object. (A) is a front view of the molded body in which the orifice forming member is assembled, and (b) is a rear view of the molded body in which the orifice forming member is assembled. (A) is sectional drawing of the liquid enclosure type vibration isolator in 2nd Embodiment, (b) is sectional drawing of the liquid enclosure type vibration isolator in the VIIIb-VIIIb line | wire of Fig.8 (a). (A) is sectional drawing of the liquid filled type vibration isolator in 3rd Embodiment, (b) is sectional drawing of the liquid filled type vibration isolator in 4th Embodiment. (A) is sectional drawing of the liquid filled type vibration isolator in 5th Embodiment, (b) is sectional drawing of the liquid filled type vibration isolator in the Xb-Xb line | wire of Fig.10 (a). (A) is sectional drawing of the liquid filled type vibration isolator in 6th Embodiment, FIG.11 (b) is sectional drawing of the liquid filled type vibration isolator in the XIb-XIb line | wire of Fig.11 (a). is there. (A) is sectional drawing of the liquid filled type vibration isolator in 7th Embodiment, FIG.12 (b) is sectional drawing of the liquid filled type vibration isolator in the XIIb-XIIb line | wire of Fig.12 (a). is there.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1A is a plan view of the liquid filled vibration isolator 100 according to the first embodiment, and FIG. 1B is a front view of the liquid filled vibration isolator 100. As shown in FIGS. 1A and 1B, the liquid-filled vibration isolator 100 includes an inner member 10 formed in an annular shape, an annular outer member 20 that concentrically surrounds the inner member 10, and And an antivibration base 30 interposed between the outer member 20 and the inner member 10.

  2A is a cross-sectional view of the liquid-filled vibration isolator 100 taken along the line IIa-IIa in FIG. 1A, and FIG. 2B is a liquid taken along the line IIb-IIb in FIG. 1 is a cross-sectional view of a sealed vibration isolator 100. FIG. FIG. 3 is a cross-sectional view of the liquid-filled vibration isolator 100 taken along line III-III in FIG.

  As shown in FIG. 2A, the inner member 10 includes a cylindrical portion 11 formed in a cylindrical shape, and a radial direction (FIG. 2A) from the center of the cylindrical portion 11 in the axial direction (vertical direction in FIG. 2A). ) Left and right direction) It has a bulging portion 12 that bulges outward in a substantially spherical shape.

  The outer member 20 is a cylindrical member that concentrically surrounds the inner member 10. The outer member 20 is vulcanized and bonded to the cylindrical portion 21 and the inner peripheral surface of the inner cylinder 21, and from a rubber-like elastic body. A rubber film 22 is provided, and an intermediate cylinder 40 on which the cylinder portion 21 is fitted.

  The anti-vibration base 30 is a member that connects the inner member 10 and the outer member 20 and is made of a rubber-like elastic body. The anti-vibration base 30 includes a pair of radial partition walls 31 formed in an annular shape on both axial sides of the inner member 10 and the outer member 20, and a rubber film portion 32 formed between the pair of radial partition walls 31. I have. The radial partition wall 31 and the rubber film portion 32 are integrally vulcanized and molded, and the inner periphery of the radial partition wall 31 is vulcanized and bonded to the outer periphery of the cylindrical portion 11. The outer periphery of the radial partition wall 31 is vulcanized and bonded to the inner periphery of the fitting peripheral wall 41 of the intermediate cylinder 40 that concentrically surrounds the inner member 10. Liquid chambers 71 and 72 are formed by closing both axial ends of the outer member 20 by the pair of radial partition walls 31. The liquid chambers 71 and 72 are filled with an antifreeze liquid (liquid) such as ethyl glycol.

  As shown in FIG. 2B, the intermediate cylinder 40 connects the pair of ring-shaped fitting peripheral walls 41 to which the cylindrical portion 21 is fitted and the fitting peripheral walls 41 to each other and has a diameter larger than that of the fitting peripheral wall 41. And a connecting wall 42 having an arcuate cross section in the axial direction. The connecting wall 42 is formed by vulcanizing and bonding a pair of axial partition walls 33 formed by vulcanization integrally with the radial partition wall 31 to the inner peripheral surface. The connecting wall 42 has a rubber film-like outer surface portion 34 that is integrally vulcanized with the radial partition wall 31 and is vulcanized and bonded to the outer peripheral surface.

  Wall portions 36 and 38 made of a rubber-like elastic body are formed on both axial sides of the outer peripheral surface 34. The wall surface portions 36 and 38 are disposed on the radially outer side of the axial partition wall 33 with the inner member 10 interposed therebetween, and extend toward the radially outer side. In the pair of wall surface portions 36, the axial distance between the wall surface portions 36 is set to be larger than the axial distance of the wall surface portion 38.

  As shown in FIG. 3, the liquid chambers 71 and 72 are partitioned in the circumferential direction by an axial partition 33 that connects the radial partition 31 in the axial direction. As a result, two substantially symmetric liquid chambers 71 and 72 facing each other with the inner member 10 interposed therebetween are formed. As shown in FIGS. 2 and 3, a pair of orifice forming members 50 are disposed between the inner member 10 and the outer member 20 (tubular portion 21). The orifice forming member 50 is a member for forming an orifice 73 (see FIG. 3) communicating with the liquid chambers 71 and 72.

  Next, the orifice forming member 50 will be described with reference to FIG. FIG. 4 is a perspective view of the orifice forming member 50. As shown in FIG. 4, the orifice forming member 50 is formed in a main body portion 51 formed in an arc shape in cross section, and on the radially inner side of the main body portion 51 and at the direction perpendicular to the axis of the rubber film portion 32 (inner member 10). A stopper 52 having a circular cross section disposed in the left-right direction (FIG. 3), and a first protrusion 53 and a second protrusion 58 that protrude on both sides in the circumferential direction of the main body 51 are provided. The orifice forming member 50 is integrally molded from synthetic resin by injection molding. Therefore, a recessed groove 62 to be described later can be formed without performing another process regardless of its shape. Therefore, for example, the product cost can be reduced as compared with the case where the recessed groove 62 is formed by cutting.

  The first protrusion 53 is a pair of a bottom surface 54 formed in a curved shape, and a pair of extending in the circumferential direction while being erected radially outward on both side edges in the width direction (axial direction) of the bottom surface 54. There are provided a standing portion 55 and a partition portion 56 that is provided between the pair of standing portions 55 and is provided on the bottom surface portion 54 so as to extend radially outward while extending in the circumferential direction. When the standing portion 55 and the partitioning portion 56 are erected on the bottom surface portion 54, first and second concave grooves 57 a and 57 b that are adjacent in the axial direction with the partitioning portion 56 interposed therebetween are formed. The first concave groove 57 a and the second concave groove 57 b open at the circumferential end of the first protrusion 53.

  The partition portion 56 is provided with a recessed groove 62 having a substantially U-shaped cross section on the end surface in the circumferential direction. The concave groove 62 is connected at one end to the outer edge (the second concave groove 57b side, the lower side in FIG. 4) of the end surface of the partitioning portion 56 (that is, the internal space of the concave groove 62 becomes the internal space of the second concave groove 57b. The other end is positioned within the end face of the partition 56 and extends linearly along the axial direction (vertical direction in FIG. 4) of the partition 56 (orifice forming member 50). In the present embodiment, the extending length of the recessed groove 62 is set to approximately 2/3 of the width dimension (thickness dimension, vertical dimension in FIG. 4) of the partition portion 56.

  The second protrusion 58 is a curved bottom surface 59, and a pair of radial protrusions extending from both sides of the bottom surface 59 in the width direction (axial direction) and extending in the circumferential direction. The standing part 60 is provided. When the standing portion 60 is erected on the bottom surface portion 59, the second concave groove 57b is formed. The second recessed groove 57b is formed over the circumferential direction of the orifice forming member 50 (the first protrusion 53, the main body 51, and the second protrusion 58). The first concave groove 57 a provided in the first projection 53 has a communication opening 61 formed near the second projection 58 of the main body 51 at the end, and opens in the axial direction of the main body 51. .

  The pair of orifice forming members 50 has a posture in which the directions of one side (upper side in FIG. 4) and the other side (lower side in FIG. 4) are opposite to each other (one orifice forming member 50 is changed to the other orifice forming member 50). The end surfaces of the first protrusions 53 and the end surfaces of the second protrusions 58 are brought into contact with each other in a posture that is turned upside down, and are disposed between the connecting wall 42 and the cylindrical portion 21 (see FIG. 3). In the present embodiment, as shown in FIG. 2B, the first protrusion 53 (bottom surface portion 54) is disposed on the inner side in the axial direction of the pair of wall surface portions 36, and the second protrusion 58 (bottom surface portion 59). ) Is disposed inside the pair of wall surface portions 38 in the axial direction. When the first protrusion 53 and the second protrusion 58 are abutted with each other, an orifice 73 is formed inside the cylindrical portion 21 (rubber film 22) by the first concave groove 57a and the second concave groove 57b.

  Further, when the end surfaces of the first projecting portions 53 of the pair of orifice forming members 50 are abutted with each other, the other end side of the recessed groove 62 formed in the partition portion 56 of the one orifice forming member 50 and the other The other end side of the recessed groove 62 formed in the partition portion 56 of the orifice forming member 50 is overlapped, and a short-circuit path 74 that connects the two points of the orifice 73 is formed. The detailed configuration of the short-circuit path 74 will be described with reference to FIGS. 5 (a) and 5 (b).

  FIG. 5A is an enlarged cross-sectional view taken along the line Va in FIG. 2B, and FIG. 5B is an enlarged cross-sectional view taken along the line Vb-Vb in FIG. In FIG. 5A, for the sake of easy understanding, the other recessed groove 62 superimposed on the one recessed groove 62 illustrated in FIG. 5A is illustrated using a broken line.

  As described above, the recessed groove 62 has one end connected to the edge on the second recessed groove 57b side and a straight line from the one end toward the first recessed groove 57a side on the circumferential end surface of the partition 56. The length dimension from one end to the other end is set to approximately 2/3 of the width dimension (axial dimension, vertical dimension in FIG. 5A) of the partition 56 (see FIG. 4).

  As a result, as shown in FIGS. 5A and 5B, the pair of orifice forming members 50 are turned upside down with respect to each other, and the end surfaces of the first protrusions 53 (partitions 56) are mutually connected. When abutted, the other end side of the recessed groove 62 formed in one partition 56 and the other end side of the recessed groove 62 formed in the other partition 56 are circumferential (see FIG. 5B). ) Are overlapped in the left-right direction), and the internal spaces of both concave grooves 62 communicate with each other, whereby a short-circuit path 74 that is smaller than the cross-sectional area of the orifice 73 and shorter in length than the orifice 73 is formed. .

  According to the liquid-filled vibration isolator 100 configured as described above, when a relatively large amplitude is input in the direction perpendicular to the axis, the axial partition is elastically deformed, and the inner member 10 and the outer member 20 are separated. Relative displacement. As a result, the axial partition 33 that divides the liquid chambers 71 and 72 is deformed, so that the liquid pressure in the liquid chambers 71 and 72 changes, and the liquid in the liquid chambers 71 and 72 flows through the orifice 73.

  In this case, when a relatively large amplitude is input, the flow rate of the liquid passing through the orifice 73 is relatively fast, so that it is difficult for the liquid to pass through the short-circuit path 74 formed with a cross-sectional area smaller than the cross-sectional area of the orifice 73. Therefore, it is possible to secure the circulation (flow amount) of the orifice 73 and enhance the damping effect.

  On the other hand, when a relatively small amplitude is input, the flow rate of the liquid is relatively slow, and the liquid easily passes through the short-circuit path 74. Therefore, the flow rate of the orifice 73 can be reduced, and the fluid flow effect (liquid column resonance) is correspondingly reduced. ) Can be suppressed. As a result, the dynamic spring constant during anti-resonance can be reduced.

  In particular, in the present embodiment, in a state where the end surface of the partition portion 56 in one orifice forming member 50 and the end surface of the partition portion 56 in the other orifice forming member 50 are abutted, the other end side of the one recessed groove 62. And the other end of the other recessed groove 62 are overlapped with each other, and a short-circuit path 74 is formed by the both recessed grooves 62, so that the end faces of the partition portion 56 are arranged in the middle of the short-circuit path 74 (on the flow path). Can be formed that bends in the overlapping direction (the left-right direction in FIG. 5B). As a result, when a relatively large amplitude is input, the liquid can hardly flow through the short-circuit path 74, and the flow amount of the orifice 73 can be secured correspondingly, so that the damping effect can be enhanced.

  Next, with reference to FIG.6 and FIG.7, the manufacturing process of the liquid filled type vibration isolator 100 is demonstrated. FIG. 6A is a side view of the molded body 80, and FIG. 6B is a front view of the molded body 80. FIG. 7A is a front view of the molded body 80 in which the orifice forming member 50 is assembled, and FIG. 7B is a rear view of the molded body 80 in which the orifice forming member 50 is assembled.

  The molded body 80 is obtained by attaching the inner member 10 and the intermediate cylinder 40 to a molding die (not shown) and then vulcanizing and adhering the vibration-proof base 30 to the inner member 10 and the intermediate cylinder 40. It is formed by. The formed molded body 80 is pre-compressed to the vibration-proof base 30 by reducing the diameter of the intermediate tube 40. 6A and 6B show a state after the diameter reduction processing.

  Next, as shown in FIGS. 7A and 7B, the pair of orifice forming members 50 are assembled to the molded body 80. That is, as shown in FIG. 7A, the bottom surface portions 54 of the pair of orifice forming members 50 are fitted between the pair of wall surface portions 36. On the other hand, as shown in FIG. 7B, the bottom surface portions 59 of the pair of orifice forming members 50 are fitted between the pair of wall surface portions 38.

  Next, the molded body 80 in which the pair of orifice forming members 50 are assembled is covered with the cylindrical portion 21 in a liquid, and then the cylindrical portion 21 is reduced in diameter, and both end portions thereof are bent inward to form the outer member 20. Deploy. By reducing the diameter of the cylindrical portion 21, the gap between the bottom surface portions 54 and 54 of the pair of orifice forming members 50 and the clearance between the bottom surface portions 59 and 59 are filled. Thereby, each end surface of the 1st protrusion 53 and 53 and each end surface of the 2nd protrusion 58 and 58 are abutted. As a result, the first concave groove 57a and the second concave groove 57b are connected in communication between the wall surface portions 36, and the second concave groove 57b is connected in communication between the wall surface portions 38, whereby the orifice 73 is formed. At the same time, a short circuit path 74 is formed. Thereby, the liquid-filled vibration isolator 100 is formed.

  In the liquid-filled vibration isolator 100, the liquid chambers 71 and 72 are communicated with each other by an orifice 73 extending in the circumferential direction. Specifically, the communication opening 61 that opens to one liquid chamber 71 and the communication opening 61 that opens to the other liquid chamber 72 communicate with each other through the first groove 57a, the second groove 57b, and the first groove 57a. Is done. As a result, the orifice forming member 50 forms an orifice 73 having a length substantially opposite to the inner circumferential side of the outer member 20.

  According to the liquid-filled vibration isolator 100, the pair of orifice forming members 50 (one orifice forming member 50 and the other orifice forming member 50) are formed in the same shape. Therefore, for example, compared with the case where one orifice forming member and the other orifice forming member are made of two types of orifice forming members having different shapes, the number of parts can be reduced, and the product cost can be reduced accordingly. be able to.

  Further, when one orifice forming member and the other orifice forming member are composed of two types of orifice forming members having different shapes, a combination of one of the two types of orifice forming members is paired. However, according to the present invention, it is possible to avoid the occurrence of such an incorrect assembly.

  Next, a second embodiment will be described with reference to FIG. FIG. 8A is a cross-sectional view of the liquid filled vibration isolator 200 according to the second embodiment, and FIG. 8B is a liquid filled vibration isolator 200 taken along line VIIIb-VIIIb in FIG. FIG. FIG. 8A corresponds to FIG. Further, the same parts as those of the first embodiment are denoted by the same reference numerals and the following description is omitted.

  As shown in FIGS. 8A and 8B, the liquid-filled vibration isolator 200 according to the second embodiment is the end face of the partition portion 256 in the orifice forming member 250 on one side (right side in FIG. 8B). On the other hand, the recessed groove 262 is recessed, but the recessed groove is not formed on the end face of the partition portion 256 in the orifice forming member 250 on the other side (left side in FIG. 8B).

  The concave groove 262 has one end and the other end connected to the edge on the first concave groove 57a side and the edge on the second concave groove 57b side on the end surface of the partition portion 256 in one orifice forming member 50, respectively. The one end and the other end extend linearly along the axial direction (vertical direction in FIG. 8A) of the partition portion 256 (orifice forming member 250).

  As a result, the pair of orifice forming members 250 are turned upside down, and the end surfaces of the partition portion 256 are abutted with each other, so that the cross-sectional area of the orifice 73 is smaller and the flow path length than the orifice 73 is. Is a short flow path, and a short-circuit path 274 that communicates between two points of the orifice 73 can be formed.

  Here, as in the first embodiment, the other ends of the recessed groove 62 of one orifice forming member 50 and the recessed groove 62 of the other orifice forming member 50 are connected to form a short circuit path 74. In this case, it is necessary that the two concave grooves 62 be arranged at a position where the other ends can be connected to each other. Therefore, the accuracy of the formation positions of the concave grooves 62 and the assembly accuracy of the pair of orifice forming members 50 are required. It is necessary to ensure. On the other hand, according to this embodiment, it is not necessary to consider the connection between the recessed grooves, and accordingly, the accuracy of the formation position of the recessed grooves 262 and the assembly accuracy of the pair of orifice forming members 250 are moderated accordingly. It can be. As a result, the product cost can be reduced.

  Further, as in the first embodiment, the other ends of the recessed groove 62 of one orifice forming member 50 and the recessed groove 62 of the other orifice forming member 50 are connected to form a short circuit path 74. In this case, if a displacement occurs in the relative position of the pair of orifice forming members 50 due to vibration during running or deterioration with time (sagging) of the vibration-proof base 30, one concave groove 62 and the other are formed. There is a possibility that the connection state between the other ends of the recessed groove 62 (that is, the state of the short-circuit path 74) changes and affects dynamic characteristics. On the other hand, according to the present embodiment, even if a positional deviation occurs between the relative positions of the pair of orifice forming members 250, the state of the short-circuit path 274 is hardly changed, and the dynamic characteristics are suppressed from being affected. it can.

  Next, with reference to FIG. 9A and FIG. 9B, the liquid filled type vibration isolator 300, 400 in the third embodiment and the fourth embodiment will be described.

  FIG. 9A is a cross-sectional view of a liquid-filled vibration isolator 300 according to the third embodiment, and FIG. 9B is a cross-sectional view of a liquid-filled vibration isolator 400 according to the fourth embodiment. 9A and 9B correspond to FIG. 8A.

  As in the case of the second embodiment described above, one of the liquid-filled vibration isolator 300 and 400 in the third embodiment and the fourth embodiment (FIG. 9 (a) and FIG. 9 (b) on the back side of the paper surface). Recessed grooves 362 and 462 are recessed only on the end surfaces of the partition portions 356 and 456 of the orifice forming members 350 and 450, and the recessed grooves are formed on the end surface of the partition portion of the other (not shown) orifice forming member. Not formed.

  As shown in FIG. 9A, the recessed groove 362 of the liquid filled type vibration isolator 300 in the third embodiment has one end and the other end on the edge on the first groove 57a side and the second groove 57b side. The one end and the other end are linearly extended while being inclined with respect to the axial direction of the partition portion 356 (orifice forming member 350) (vertical direction in FIG. 9A). Established. Thereby, the flow path length of the short circuit path 374 can be made into a long dimension compared with the case of 2nd Embodiment mentioned above.

  As shown in FIG. 9B, the recessed groove 462 of the liquid filled type vibration damping device 400 in the fourth embodiment has one end and the other end on the edge on the first groove 57a side and the second groove 57b side. The two edges between the one end and the other end are bent and formed. As a result, the short-circuit path 474 can be formed in a shape having bent portions at two locations (that is, a crank shape in which two flow paths that are bent at substantially right angles are alternately connected). As a result, when a relatively large amplitude is input, the liquid can hardly flow through the short-circuit path 474, and the flow amount of the orifice 73 can be secured correspondingly, so that the damping effect can be enhanced.

  Next, a liquid-filled vibration isolator 500 according to the fifth embodiment will be described with reference to FIGS. 10 (a) and 10 (b).

  FIG. 10A is a cross-sectional view of a liquid filled vibration isolator 500 according to the fifth embodiment, and FIG. 10B is a liquid filled vibration isolator 500 taken along line Xb-Xb of FIG. FIG. In FIG. 10A, for easy understanding, the other recessed groove 562 superimposed on the one recessed groove 562 illustrated in FIG. 10A is illustrated using a broken line.

  As shown in FIGS. 10A and 10B, the recessed groove 562 of the liquid filled type vibration damping device 500 according to the fourth embodiment has one end at the outer edge (second recessed groove 57b) of the end face of the partition portion 556. 10a (the lower side of FIG. 10A) (that is, the internal space of the recessed groove 562 communicates with the internal space of the second recessed groove 57b) and the other end is located within the end surface of the partition portion 556, Two portions between one end and the other end are bent and formed. That is, the recessed groove 562 is formed in a shape having bent portions at two locations (a crank shape in which two flow paths bent at substantially right angles are alternately connected).

  Therefore, when the pair of orifice forming members 550 are in an upside down posture and the end surfaces of the partitioning portion 556 are abutted with each other, the other end side of the recessed groove 562 formed in one partitioning portion 556, The other end side of the recessed groove 562 formed in the other partition portion 556 is overlapped in the circumferential direction (FIG. 10 (b) left and right direction), and the internal spaces of the both recessed grooves 562 communicate with each other. A short-circuit path 574 that is smaller than the cross-sectional area of the orifice 73 and shorter than the orifice 73 and that communicates between two points of the orifice 73 can be formed.

  In this case, in the present embodiment, a part of the short-circuit path 74 that is bent in the overlapping direction (the left-right direction in FIG. 10B) between the end faces of the partition portion 556 is provided in the middle of the short-circuit path 74 (on the flow path). The other end of the recess groove 562 and the other end of the other recessed groove 562 can be formed on each other, and a portion that is bent at two positions between one end and the other end of each recessed groove 562 can be formed. Can be formed. That is, the short-circuit path 74 can be formed into a shape having portions bent at five places as a whole. As a result, when a relatively large amplitude is input, the liquid can hardly flow through the short-circuit path 574, and the flow amount of the orifice 73 can be secured correspondingly, so that the damping effect can be enhanced.

  Next, with reference to FIG. 11A and FIG. 11B, a liquid filled type vibration damping device 600 according to the sixth embodiment will be described.

  FIG. 11A is a cross-sectional view of a liquid-filled vibration isolator 600 according to the sixth embodiment, and FIG. 11B is a liquid-filled vibration isolator 600 taken along the line XIb-XIb in FIG. FIG. In FIG. 11A, for easy understanding, the other recessed groove 662 superimposed on one recessed groove 662 illustrated in FIG. 11A is illustrated using a broken line.

  As shown in FIGS. 11 (a) and 11 (b), the recessed groove 662 of the liquid filled type vibration damping device 600 in the sixth embodiment has a circumferential end surface of the partition portion 656 as a substantially spherical concave surface. It is formed as a recessed part (groove) provided as a recess.

  In this case, the recessed groove 662 has one end connected to the edge on the second recessed groove 57b side and the other end (the end on the first recessed groove 57a side) on the circumferential end surface of the partition portion 656. 11 (a) (upper end in FIG. 11 (a)) is set to approximately 2/3 of the width dimension (length in the axial direction, vertical dimension in FIG. 11 (a)) of the partition 656. . Therefore, when the pair of orifice forming members 650 are vertically inverted from each other and the end surfaces of the partition portion 656 are abutted with each other, the other end side of the recessed groove 662 formed in one partition portion 656, The other end side of the recessed groove 662 formed in the other partitioning portion 656 is overlapped in the circumferential direction (FIG. 11 (b) left and right direction), and the internal spaces of the both recessed grooves 662 communicate with each other. A short-circuit path 674 that is smaller than the cross-sectional area of the orifice 73 and has a shorter flow path length than the orifice 73 is formed.

  According to this embodiment, as in the case of the first embodiment described above, in the middle of the short-circuit path 674 (on the flow path), in the overlapping direction of the end faces of the partition portion 656 (FIG. 11 (b) left-right direction). Since the bent portion can be formed, the liquid can hardly flow through the short-circuit path 674 when a relatively large amplitude is input, and accordingly, the flow amount of the orifice 73 can be secured and the damping effect can be enhanced. .

  In addition, as described above, the shape of the recessed groove 662 is formed as a recessed portion (groove) in which the circumferential end surface of the partitioning portion 656 is formed as a substantially spherical recessed surface, so that the orifice forming member 650 is formed. In the molding die (not shown) to be formed, it is possible to suppress the formation of an acute portion (angular shape) at the protruding portion for forming the recessed groove 662. Thereby, chipping and wear of the protruding portion can be suppressed, and the durability of the molding die can be improved accordingly. In addition, since formation of an acute portion (angular shape) is suppressed, when the orifice forming member 650 is formed by casting or injection molding, the material in the vicinity of the recessed groove 662 of the partition portion 656 is reduced. The liquidity can be secured and the yield can be improved.

  Next, with reference to FIG. 12A and FIG. 12B, a liquid filled type vibration damping device 700 according to the seventh embodiment will be described.

  FIG. 12A is a cross-sectional view of a liquid-filled vibration isolator 700 according to the seventh embodiment, and FIG. 12B is a liquid-filled vibration isolator 700 taken along the line XIIb-XIIb in FIG. FIG. In FIG. 12A, for easy understanding, the other recessed groove 762 superimposed on the one recessed groove 762 illustrated in FIG. 12A is illustrated using a broken line.

  As shown in FIG. 12A and FIG. 12B, the recessed groove 762 of the liquid-filled vibration isolator 700 in the seventh embodiment extends linearly between one end and the other end. When the end face of the partition 756 in one orifice forming member 750 and the end face of the partition 756 in the other orifice forming member 750 are in contact with each other, the end face is viewed from the front (that is, the state shown in FIG. 12A). ), The extending direction of one recessed groove 762 and the extending direction of the other recessed groove 762 are set to different directions (that is, intersecting in a substantially V shape).

  In this case, the recessed groove 762 has one end connected to the edge on the second recessed groove 57b side on the circumferential end surface of the partition 756 and the partition 756 (orifice forming member 750) from one end thereof. Inclined with respect to the axial direction (FIG. 12 (a) vertical direction), it extends linearly to a position exceeding the center in the width direction (axial dimension, FIG. 12 (a) vertical dimension) of the partition 56. .

  Therefore, when the pair of orifice forming members 750 are in an upside-down posture and the end surfaces of the partition portion 756 are abutted with each other, the other end side of the recessed groove 762 formed in one partition portion 756, The other end side of the recessed groove 762 formed in the other partition portion 756 is overlapped in the circumferential direction (FIG. 12 (a) perpendicular to the paper surface), and the internal spaces of the both recessed grooves 762 are communicated with each other. A short-circuit path 774 that is smaller than the cross-sectional area of the orifice 73 and shorter in length than the orifice 73 is formed.

  According to the present embodiment, as in the case of the first embodiment described above, in the middle of the short-circuit path 774 (on the flow path), in the overlapping direction of the end surfaces of the partition portion 756 (FIG. 12B, left-right direction). Since the bent portion can be formed, the liquid can hardly flow through the short-circuit path 774 when a relatively large amplitude is input, and the amount of flow of the orifice 73 can be secured correspondingly, and the damping effect can be enhanced. .

  In addition, as described above, in a state where the end surface of one partition 756 and the end surface of the other partition 756 are abutted, in front view of the end surface (that is, the state illustrated in FIG. 12A). Since the extending direction of the one recessed groove 762 and the extending direction of the other recessed groove 762 are set in different directions (that is, intersecting in a substantially V shape), the change in the extending direction is performed. By utilizing (substantially V-shaped intersection), the liquid can hardly flow through the short-circuit path 774. That is, when a relatively large amplitude is input, the liquid is less likely to flow through the short-circuit path 774, and the flow amount of the orifice can be ensured accordingly, so that the damping effect can be further enhanced.

  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.

  It is naturally possible to combine part or all of the configuration in each of the above embodiments with part or all of the configuration in the other embodiments.

  In the first embodiment, the fifth embodiment, the sixth embodiment, and the seventh embodiment, the case where the pair of orifice forming members 50, 550, 650, and 750 are formed in the same shape is described. However, the present invention is not limited to this, and the pair of orifice forming members 50, 550, 650, and 750 may not have the same shape.

  That is, when the recessed groove of one orifice forming member and the recessed groove of the other orifice forming member have different shapes, and the end surfaces of the partition portions of the one and other orifice forming members are abutted with each other Alternatively, a part of the concave grooves of each other (the other ends) may overlap to form a short circuit path.

  In the second embodiment, the third embodiment, and the fourth embodiment, the concave grooves 262, 362, and 462 are provided only in one orifice forming member 250, 350, and 450, and the other orifice forming member 250, 350, and 450 are provided. However, the present invention is not necessarily limited to this, and the orifice forming members 250, 350, and 450 are not necessarily provided with the concave grooves 262, 362, and 462. 362 and 462 may be provided. That is, the liquid-filled vibration isolator 200, 300, 400 may be formed by combining two orifice forming members 250, 350, 450 having the recessed grooves 262, 362, 462 formed therein. Thereby, since the number of parts can be reduced by using one kind of orifice forming member, the product cost can be reduced accordingly.

  In this case, in the third embodiment and the fourth embodiment, one and the other recessed grooves 362 and 462 partially intersect (overlap), so that two of the flow paths partially intersect (communicate). However, since the short-circuit path has a smaller cross-sectional area and a shorter flow path length than the orifice 73, the same effect as that described above (relatively small amplitude vibration input) In some cases, the dynamic spring constant can be reduced and the damping effect can be increased when a relatively large amplitude vibration is input.

  In each of the above-described embodiments, the case where the short-circuit paths 74 to 674 are formed as flow paths that communicate between two points of the orifice 73 (the first concave groove 57a and the second concave groove 57b) has been described. The flow path is not limited, and the orifice 73 (the first concave groove 57 a or the second concave groove 57 b) and the liquid chamber 71 or the liquid chamber 72 may be formed as a flow path.

  In this case, the concave groove is not formed in the partitioning portions 56 to 756 but in the circumferential end surface of the standing portion 55 in the first protrusion 53 or in the circumferential direction of the standing portion 60 in the second protrusion 58. In addition to being formed (concave) on the end surface, a channel for communicating the concave groove (short-circuit path) with the liquid chamber 71 or the liquid chamber 72 is formed in the wall surface portions 36 and 38 of the vibration-proof base 30.

  In each of the above-described embodiments, the case where the orifice forming members 50 to 750 are formed of synthetic resin has been described. However, the present invention is not necessarily limited thereto, and may be formed of other materials. Examples of other materials include iron and aluminum alloys.

  In each of the embodiments described above, the case where the orifice forming members 50 to 750 in which the recessed grooves 62 to 762 are recessed is formed by casting or injection molding is not necessarily limited to this. For example, The orifice forming members 50 to 750 are molded by casting or injection molding in a state where the recessed grooves 62 to 762 are not formed, and the recessed grooves 62 to 762 are formed in another process (for example, cutting, grinding, laser processing, etc.). May be formed. In this case, a short-circuit path having a different shape can be set for each vehicle type while diverting the molding die.

  In the above embodiments, except for the sixth embodiment, the shape of the recessed grooves 62 to 562 and 762 in the front view of the end faces of the partition portions 56 to 556 and 756 is a straight line or a combination of straight lines. Although the case has been described, the present invention is not necessarily limited thereto, and may be a shape formed of a curve or a combination of a straight line and a curve.

  In each of the above embodiments, except for the sixth embodiment, the case where the recessed grooves 62 to 562 and 762 have a U-shaped cross section has been described. However, the present invention is not necessarily limited to this, and other cross sectional shapes are used. May be. Examples of other cross-sectional shapes include a circular arc shape, a semicircular cross-section, a U-shaped cross-section, a V-shaped cross-section, and a trapezoidal cross-section.

100, 200, 300, 400, 500, 600, 700 Liquid-sealed vibration isolator 10 Inner member (inner cylinder)
20 Outer member (outer cylinder)
30 Anti-vibration base 50, 250, 350, 450, 550, 650, 750 Orifice forming member 262, 362, 462 Recessed groove 62, 562, 662, 762 Recessed groove (first recessed groove, second recessed groove) )
71,72 Liquid chamber 73 Orifice 74,274,374,474,574,674,774 Short circuit path

Claims (8)

An inner cylinder formed in a cylindrical shape, an outer cylinder surrounding an outer peripheral side of the inner cylinder, a vibration isolating base that connects the inner cylinder and the outer cylinder and is made of a rubber-like elastic body, and the vibration isolating base The two liquid chambers that are partitioned at positions facing each other with the inner cylinder interposed therebetween, and the end faces in the circumferential direction are abutted with each other and disposed between the outer cylinder and the inner cylinder, and the two liquids In a liquid-filled vibration isolator comprising a pair of orifice forming members that form orifices that allow the chambers to communicate with each other,
A recessed groove recessed in the end face of at least one of the pair of orifice forming members;
In a state where the end faces of the pair of orifice forming members are in contact with each other, a flow path between the end faces having a smaller cross-sectional area and a shorter flow path length than the orifices. The liquid-filled vibration isolator is characterized in that a short-circuit path for communicating the orifice or the liquid chamber is formed by the recessed groove. The recessed groove is
A first recessed groove that is recessed in the end surface of one of the pair of orifice forming members;
A second recessed groove recessed in the end face of the other orifice forming member of the pair of orifice forming members,
The first recessed groove has one end connected to the outer edge of the end surface of the one orifice forming member and the other end positioned in the end surface of the one orifice forming member,
The second recessed groove has one end connected to the outer edge of the end surface of the other orifice forming member and the other end located in the end surface of the other orifice forming member,
In a state where the end face of the one orifice forming member and the end face of the other orifice forming member are abutted, the other end side of the first recessed groove and the other end side of the second recessed groove are overlapped, 2. The liquid-filled vibration isolator according to claim 1, wherein the short-circuit path is formed by the first concave groove and the second concave groove.   The liquid-filled type prevention according to claim 2, wherein at least one of the first concave groove or the second concave groove is formed by bending at least one portion between the one end and the other end. Shaker. The first concave groove and the second concave groove are linearly extended between the one end and the other end,
In a state where the end surface of the one orifice forming member and the end surface of the other orifice forming member are in contact with each other, the extending direction of the first recessed groove and the extending direction of the second recessed groove are viewed from the front of the end surface. The liquid-filled vibration isolator according to claim 2, wherein the installation direction is set in a different direction.   The one orifice forming member and the other orifice forming member are formed in the same shape as each other, and the end surfaces are abutted against each other in a posture in which the directions on one side and the other side in the axial direction are opposite to each other. The other end side of the first recessed groove and the other end side of the second recessed groove are overlapped to form the short circuit path. Liquid-filled vibration isolator. The recessed groove is formed in the end surface of one orifice forming member of the pair of orifice forming members, and the end surface of the other orifice forming member of the pair of orifice forming members includes the The recessed groove is not formed,
The liquid-filled vibration isolator according to claim 1, wherein one end and the other end of the recessed groove are continuous with an outer edge of an end surface of the one orifice forming member.   The liquid filled type vibration damping device according to claim 6, wherein the recessed groove is formed by bending at least one portion between the one end and the other end.   The liquid-filled vibration isolator according to any one of claims 1 to 7, wherein the pair of orifice forming members are formed by casting or injection molding.

Images