JP2006342849A - Liquid sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a sufficient orifice length for a main orifice in a liquid sealed vibration control device provided with an auxiliary orifice provided with a rubber valve. <P>SOLUTION: An intermediate cylinder 32 positioned between an inner and an outer cylinders 12 and 14 is structured of fitting peripheral walls 34 and 46 in both ends and connecting walls 38 and 40 between them. A vibration control base 16 formed by connecting the connecting walls and the the inner cylinder divides a first liquid chamber and a second liquid chamber, and the fitting peripheral walls and the inner cylinder are connected by an end wall 42 formed from a rubber-like elastic body, and the outer peripheral sides of the connecting walls are provided with pressure-contact parts 44 and 46 corresponding to the outer cylinder. The pressure-contact parts are respectively provided with fitting recessed parts 48 and 54. Main orifice forming members 60 and 70 respectively provided with grooves 64 and 74 in the outer peripheral surfaces thereof are arranged inside the first liquid chamber and the second liquid chamber, and fitting projections 66, 68, 76 and 78 formed in both ends of the main orifice members are fitted in the fitting recessed parts to form the main orifice 22 for communicating the first liquid chamber with the second liquid chamber. Width W11 and W10 of the fitting projection and the recessed part on one end side and width W21 and W20 of the fitting projection and the recessed part on the other end side are set to a different dimension. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Conventionally, as a liquid-filled vibration isolator, Patent Document 1 below sandwiches an inner cylinder, an outer cylinder, a vibration isolating base made of a rubber-like elastic body interposed between both cylinders, an intermediate cylinder, and an inner cylinder. A bush-type vibration isolator is disclosed that includes a first liquid chamber and a second liquid chamber provided on both sides, and a main orifice that communicates both liquid chambers. In this vibration isolator, the intermediate cylinder is positioned between the pair of ring-shaped fitting peripheral walls on both ends in the axial direction with which the outer cylinder is fitted, and the axis of the intermediate cylinder, and the pair of fitting peripheral walls The main orifice is formed by forming an orifice groove in a rubber portion provided on the outer peripheral surface side of the connection wall and covering this with an outer cylinder.

  Further, in Patent Document 2 below, in the liquid-filled vibration isolator having the above-described structure, a first liquid is circulated only from the first liquid chamber side to the second liquid chamber side via the first rubber valve. And a second sub-orifice for allowing liquid to flow only from the second liquid chamber side to the first liquid chamber side via the second rubber valve, and the first sub-orifice on the outer peripheral surface side of the connecting wall A second sub-orifice is disclosed. In this liquid-filled vibration isolator, when the hydraulic pressure difference between the first liquid chamber and the second liquid chamber becomes a set value and becomes a set value, the first rubber valve or the second rubber valve is elastically deformed and opened. When the liquid flows through the first sub-orifice or the second sub-orifice, the hydraulic pressure difference is alleviated.

In the above conventional liquid-filled vibration isolator, each of the main orifices is simply formed by forming an orifice groove in a rubber portion provided on the outer peripheral surface side of the connecting wall and covering this with an outer cylinder. It was.
JP 2003-184941 A WO 03/033936 A1

  In the conventional structure described above, the main orifice is provided in the rubber portion provided on the outer peripheral surface side of the connecting wall of the intermediate cylinder, so that it is difficult to ensure a sufficient orifice length corresponding to the required vibration isolation characteristics. It was. In particular, when the first sub-orifice and the second sub-orifice are formed on the outer peripheral surface of the connecting wall as well as the first sub-orifice and the second sub-orifice on the outer peripheral surface of the connecting wall as in the above-described vibration isolator of Patent Document 2, the main orifice is formed. Sufficient space cannot be secured.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid-filled vibration isolator capable of ensuring a sufficient orifice length for the main orifice.

  A liquid-filled vibration isolator according to the present invention includes an inner cylinder, an outer cylinder that surrounds the inner cylinder in an axis-parallel manner, and a vibration-damping base that includes a rubber-like elastic body interposed between the inner cylinder and the outer cylinder, An intermediate cylinder positioned between the inner cylinder and the outer cylinder, a first liquid chamber and a second liquid chamber positioned with the inner cylinder interposed therebetween, and a main orifice that communicates the first liquid chamber and the second liquid chamber. Prepare. The intermediate cylinder is positioned between a pair of ring-shaped fitting peripheral walls on both end sides in the axial direction to which the outer cylinder is fitted, and the inner cylinder, and is positioned radially inward from the fitting peripheral wall. A pair of connecting walls that connect the pair of fitting peripheral walls, and the anti-vibration base couples an inner surface of the pair of connecting walls and an outer peripheral surface of the inner cylinder facing the inner surface. The first liquid chamber and the second liquid chamber are partitioned in the circumferential direction, and an end wall made of a rubber-like elastic body is provided between the pair of fitting peripheral walls and the inner cylinder, The end walls form chamber walls at the axial ends of the first liquid chamber and the second liquid chamber. In addition, a first pressure contact portion made of a rubber-like elastic body that is in pressure contact with the inner peripheral surface of the outer cylinder is provided on the outer surface side of one of the connection walls, and a first fitting recess is provided in the first pressure contact portion, A second pressure contact portion made of a rubber-like elastic body that is in pressure contact with the inner peripheral surface of the outer cylinder is provided on the outer surface side of the other connecting wall, and a second fitting recess is provided in the second pressure contact portion. In the first liquid chamber, a first main orifice forming member having a first main orifice groove communicating with the first liquid chamber through the first opening on the outer peripheral surface is disposed. Fitting protrusions are provided at both ends in the circumferential direction, and the first main orifice groove is opened outward in the circumferential direction at one of the fitting protrusions. By fitting the one fitting projection into the first fitting recess and the other fitting projection into the second fitting recess, the first pressure contact portions on both sides in the first liquid chamber And the second press-contact portion. Further, the outer peripheral surface of the first main orifice forming member is in pressure contact with the inner peripheral surface of the outer cylinder, and the first main orifice groove is communicated with the second liquid chamber side in the first press contact portion, thereby the main orifice. Is formed. Here, the width of the first fitting recess and the one fitting projection fitted to the first fitting recess is the width of the second fitting recess and the other fitting projection fitted to the second fitting recess. Different dimensions are set.

  According to this configuration, since the main orifice is formed by the first main orifice forming member mounted inside the first liquid chamber, a sufficient orifice length for the main orifice can be ensured. The liquid flow action by the orifice can be effectively exhibited. Moreover, this 1st main orifice formation member fits the fitting protrusion of both ends to the 1st and 2nd fitting recessed part provided in the 1st and 2nd press-contact part of the outer surface side of a connection wall. Since it is arranged in the first liquid chamber, assembly work is also easy. Furthermore, the width of the first fitting recess of the first main orifice forming member and the first fitting recess in which it is fitted, the width of the second fitting recess in which the other fitting projection is fitted, By setting the different widths, it is possible to prevent the first main orifice forming member from being assembled in a wrong direction. That is, from the viewpoint of workability at the time of manufacturing the vibration isolator, the main orifice forming member is easy to mount and it is extremely important to prevent erroneous mounting. As described above, both ends are set to different widths. Accordingly, it is possible to completely prevent erroneous mounting without impairing workability.

  In the liquid-sealed vibration isolator of the present invention, a main orifice forming member can be provided in the second liquid chamber as well as the first liquid chamber. That is, a second main orifice forming member provided on the outer peripheral surface with a second main orifice groove communicating with the second liquid chamber through the second opening may be disposed in the second liquid chamber. In this case, fitting protrusions are provided at both ends in the circumferential direction of the second main orifice forming member, and the second main orifice groove is opened outward in the circumferential direction at one of the fitting protrusions. The second main orifice forming member is configured to fit the one fitting projection into the first fitting recess and the other fitting projection into the second fitting recess, respectively. The two liquid chambers are arranged in a state of being spanned between the first press contact portion and the second press contact portion on both sides. The outer peripheral surface of the second main orifice forming member is pressed against the inner peripheral surface of the outer cylinder, and the first main orifice groove and the second main orifice groove are connected in communication at the first press contact portion. The main orifice is formed, and the width of the first fitting recess and the one fitting protrusion fitted to the first fitting recess is the second fitting recess and the other fitting fitted to the second fitting recess. The width of the protrusion is set to a different dimension. As described above, by mounting the second main orifice forming member as well, the orifice length for the main orifice can be secured more sufficiently, and the liquid flow action by the main orifice can be effectively exhibited.

  In the liquid-filled vibration isolator of the present invention, an inner stopper that protrudes radially outward from the inner cylinder side is provided in the first liquid chamber and / or the second liquid chamber, and the first main orifice forming member In addition, the second main orifice forming member may be provided with an outer stopper that protrudes radially inward facing the inner stopper.

  In the case of providing a stopper that limits the relative displacement of the inner and outer cylinders within a predetermined range, it can be configured only by a stopper that protrudes radially outward from the inner cylinder side as described in Patent Documents 1 and 2 above. However, when the stopper is formed only from the inner cylinder side, the stopper comes into contact with the end wall and is damaged when displaced in a twisting direction in which the axis of the outer cylinder is inclined with respect to the axis of the inner cylinder. There is a fear. On the other hand, by dividing the stopper into the inner stopper from the inner cylinder side and the outer stopper from the first and second main orifice forming members as described above, the end wall at the time of displacement in the twisting direction Breakage can be prevented. In other words, according to the present invention, the member for forming the main orifice also acts as a stopper, thereby ensuring the orifice length for the main orifice without increasing the number of parts and the end wall of the stopper. Damage can be prevented.

  The liquid-filled vibration isolator of the present invention includes a first sub-orifice for allowing liquid to flow only from the first liquid chamber side to the second liquid chamber side via the first rubber valve, and a second via the second rubber valve. And a second sub-orifice that allows the liquid to flow only from the liquid chamber side to the first liquid chamber side. In this case, a first sub-orifice groove extending in the circumferential direction is provided in at least one of the first pressure-contact portion and the second pressure-contact portion, and between the first sub-orifice groove and the inner peripheral surface of the outer cylinder. The first sub-orifice is formed, and a second sub-orifice groove extending in the circumferential direction is provided in at least one of the first pressure-contact portion and the second pressure-contact portion, and the second sub-orifice groove and the inner cylinder The second sub-orifice is formed between the peripheral surface and the first sub-orifice groove is provided with the rubber film-shaped first rubber valve, and the top of the first rubber valve is the inner peripheral surface of the outer cylinder. The first rubber valve is formed in an inclined posture in which the first rubber valve is positioned on the downstream side of the first sub-orifice toward the top, and the rubber film-like second rubber valve is formed in the second sub-orifice groove. So that the top of the second rubber valve is in pressure contact with the inner peripheral surface of the outer cylinder. Made is, the second rubber valve is formed in an inclined posture positioned on the downstream side of the second sub-orifice as the top side. Further, in this case, a bulging portion having an arcuate cross section that is in pressure contact with the inner peripheral surface of the outer cylinder is formed at the tops of the first rubber valve and the second rubber valve over the entire width of the top rubber part. The bulge portion of the first rubber valve bulges outward from the film surface corresponding to the upstream side of the first sub-orifice of the pair of film surfaces of the first rubber valve, and the second rubber valve. Preferably, the bulging portion of the second rubber valve bulges outward from the film surface corresponding to the upstream side of the second sub-orifice of the pair of film surfaces of the second rubber valve.

  Thus, by providing the top part of the 1st rubber valve and the 2nd rubber valve with the bulging part of the section circular arc shape press-contacting to the inner peripheral surface of an outer cylinder, the fluid pressure difference of the 1st liquid chamber and the 2nd liquid chamber Becomes the set value, the bulging part urges the swinging of the first rubber valve or the second rubber valve toward the opening side. For example, the first rubber valve and the second rubber valve are simply rubber having a constant thickness. The opening speed of the first rubber valve or the second rubber valve is faster than the structure formed in a film shape. Thereby, the time for lowering the hydraulic pressure difference between the two liquid chambers to a desired value can be shortened.

  In the present invention, the first pressure contact portion is provided with the first fitting recess at the axial center portion, and the first sub-orifice groove is provided on at least one side of both sides thereof. A rubber-made end portion of the first rubber valve provided in the width direction and a side portion of a rubber-made annular seal lip extending in the circumferential direction provided on the outer peripheral surface of the fitting peripheral wall. A seal lip may be formed on the outer peripheral surface of the first pressure contact portion. In addition, the second pressure contact portion is provided with the second fitting recess in the axial center portion, the second sub-orifice groove is provided on at least one side of both sides, and the second sub-orifice groove is provided. A rubber seal lip connected to one end portion in the width direction of the bulging portion of the second rubber valve thus formed and a side portion of a circumferential annular rubber seal lip provided on the outer peripheral surface of the fitting peripheral wall However, it may be formed on the outer peripheral surface of the second pressure contact portion.

  By adopting such a configuration, the liquid can flow outwardly in the width direction of the first rubber valve or the second rubber valve between the outer peripheral surface of the first press contact portion or the second press contact portion and the inner peripheral surface of the outer cylinder. Can be prevented by an annular seal lip. When the first rubber valve or the second rubber valve is closed, the first rubber valve or the second rubber is interposed between the outer peripheral surface of the first press contact portion or the second press contact portion and the inner peripheral surface of the outer cylinder. The first rubber valve can prevent the trouble that the liquid flows in the direction along the first sub-orifice and the second sub-orifice on the outer side in the width direction of the valve by the annular seal lip and the above-described seal lip. In addition, it is possible to avoid the problem that the first sub-orifice portion and the second sub-orifice portion on both sides of the second rubber valve are in communication.

  As described above, the liquid-filled vibration isolator of the present invention ensures a sufficient orifice length for the main orifice even in the liquid-filled vibration-proof device provided with the sub-orifice having a rubber valve. Can do. Moreover, it is excellent in the assembly workability | operativity of the member for forming a main orifice, and the incorrect assembly | attachment can be prevented reliably.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 to 6 show a liquid-filled vibration isolator 10 according to an embodiment of the present invention. As shown in FIG. 15, the liquid-filled vibration isolator 10 is a bush type vibration isolator that couples between a lower link 1 of a suspension of a front wheel of an automobile and a vehicle body frame. In FIG. 15, reference numeral 2 represents a tire, and reference numeral 3 represents a ball joint.

  The vibration isolator 10 includes a cylindrical inner cylinder 12 connected to the vehicle body frame, a cylindrical outer cylinder 14 that coaxially surrounds the inner cylinder 12 and is press-fitted into the press-fitting hole of the lower link 1. And an anti-vibration base 16 made of a rubber-like elastic body interposed therebetween.

  Between the inner cylinder 12 and the outer cylinder 14, a first liquid chamber 18 and a second liquid chamber 20 having a vibration-proof base 16 as a chamber wall are formed so as to face both sides of the inner cylinder 12. Yes. The first liquid chamber 18 and the second liquid chamber 20 are communicated with each other via the main orifice 22. In addition, a first sub-orifice between the first liquid chamber 18 and the second liquid chamber 20 allows the liquid to flow only from the first liquid chamber 18 side to the second liquid chamber 20 side via the first rubber valve 24. 26 and a second sub-orifice 30 through which liquid flows only from the second liquid chamber 20 side to the first liquid chamber 18 side via the second rubber valve 28.

  Between the inner cylinder 12 and the outer cylinder 14, an intermediate cylinder 32 having a circular cross section that surrounds the inner cylinder 12 coaxially is disposed. The intermediate cylinder 32 is positioned on both sides of the inner cylinder 12 with the pair of ring-shaped fitting peripheral walls 34 and 36 on both ends in the axial direction on which the outer cylinder 14 is fitted, and more than the fitting peripheral walls 34 and 36. A pair of connecting walls 38 and 40 having an arcuate cross section are provided on the inner side in the radial direction and connecting the pair of fitting peripheral walls 34 and 36 to each other.

  As shown in FIGS. 2 and 5, the anti-vibration base 16 is provided between the inner side surface 38 </ b> A of the first connection wall 38, which is one of the connection walls, and the outer peripheral surface 12 </ b> A of the inner cylinder 12 facing this, and A pair of anti-vibration base bodies 16 are vulcanized and formed between the inner side surface 40A of the second connecting wall 40, which is a connecting wall, and the outer peripheral surface 12A of the inner cylinder 12 opposite to the inner side surface 40A. , 16 divides the first liquid chamber 18 and the second liquid chamber 20 in the circumferential direction.

  As shown in FIGS. 1 and 6, between the first fitting peripheral wall 34 that is one fitting peripheral wall and the inner cylinder 12 and between the second fitting peripheral wall 36 and the inner cylinder 12 that are the other fitting peripheral walls. The end walls 42, 42 made of a rubber-like elastic body are provided between them, and the pair of end walls 42, 42 are chamber walls at both axial ends of the first liquid chamber 18 and the second liquid chamber 20. Is forming. As shown in FIG. 6, the end wall 42 is formed in an inwardly curved shape, and more specifically, a cross-sectional curved shape in which a central portion 42 </ b> A in the height direction projects most toward the center in the axial direction. Is formed. As a result, when a load is input in a direction perpendicular to the axis P (a direction perpendicular to the axis O), the end wall 42 is bent inwardly in the compression-side liquid chamber, thereby deforming the compression-side liquid chamber. The volume change is increased to enhance the liquid flow action at the main orifice 22.

  As shown in FIG. 2, on the outer surface 38B side of the first connection wall 38, a first pressure contact portion 44 that is in pressure contact with the inner peripheral surface 14A of the outer cylinder 14 is formed of a rubber-like elastic body, and the second connection wall On the outer surface 40B side of 40, a second press-contact portion 46 that press-contacts the inner peripheral surface 14A of the outer cylinder 14 is provided by a rubber-like elastic body.

  As shown in FIGS. 7 and 8, the first press contact portion 44 is provided with a first fitting recess 48 extending in the circumferential direction at the central portion in the axial direction, and a pair of first extending in the circumferential direction on both sides in the axial direction. Sub-orifice grooves 50, 50 are formed. The first fitting recess 48 and the first sub-orifice groove 50 have a U-shaped cross section that opens outward in the radial direction, and are formed over the entire circumferential direction of the first connecting wall 38.

  The first sub-orifice 26 is formed by pressing the inner peripheral surface 14A of the outer cylinder 14 against the first sub-orifice groove 50. In this embodiment, the first sub-orifice 26 has two pieces in the first press-contact portion 44. First sub-orifices 26, 26 are provided in parallel to each other. The first rubber valves 24, 24 are respectively vulcanized and formed in the pair of first sub-orifice grooves 50, 50 so that the top 24A of the first rubber valve 24 is in pressure contact with the inner peripheral surface 14A of the outer cylinder 14. It is configured. In addition, the first rubber valve 24 is set to an inclined posture that is located on the downstream side of the first sub-orifice 26 toward the top portion 24A (see FIGS. 5 and 14).

  As shown in FIG. 14, the first rubber valve 24 is formed in a rubber film shape, and a bulging portion 52 having an arcuate cross section that is in pressure contact with the inner peripheral surface 14A of the outer cylinder 14 is formed over the entire width of the top portion 24A. Has been. The bulging portion 52 bulges from the membrane surface 24B on the side corresponding to the upstream side of the first sub-orifice 26 of the pair of membrane surfaces 24B, 24C of the first rubber valve 24 to the outer side R of the membrane surface 24B. ing. As shown in FIG. 8, the bulging portions 52 and 52 of the pair of first rubber valves 24 and 24 are located at the center in the circumferential direction of the first connecting wall 38. In addition, the bulging part 52 does not necessarily need to be the center of the circumferential direction of the 1st connection wall 38, and may shift | deviate from this center.

  As shown in FIG. 9, the second press-contact portion 46 is provided with a second fitting recess 54 extending in the circumferential direction at the central portion in the axial direction, and a pair of second sub-orifices extending in the circumferential direction on both sides in the axial direction. Grooves 56 and 56 are formed. The second fitting recess 54 and the second sub-orifice groove 56 have a U-shaped cross section that opens outward in the radial direction, and are formed over the entire circumferential direction of the second connecting wall 40. However, the 2nd fitting recessed part 54 is interrupted | blocked by the interruption | blocking part 58 in the center part of the circumferential direction, and is divided | segmented into the circumferential direction.

  The second sub-orifice 30 is formed by pressing the inner peripheral surface 14A of the outer cylinder 14 against the second sub-orifice groove 56. In this embodiment, the second sub-orifice 30 has two Second sub-orifices 30 are provided in parallel to each other. The second rubber valves 28, 28 are vulcanized and formed in the pair of second sub-orifice grooves 56, 56, respectively, so that the top portion 28A of the second rubber valve 28 is in pressure contact with the inner peripheral surface 14A of the outer cylinder 14. It is configured. In addition, the second rubber valve 28 is set in an inclined posture that is positioned on the downstream side of the second sub-orifice 30 toward the top portion 28A (see FIGS. 5 and 14).

  The second rubber valve 28 has the same shape and size as the first rubber valve 24. That is, as shown in FIG. 14, the second rubber valve 28 is formed in a rubber film shape and includes the bulging portion 52 at the top portion 28 </ b> A, and the bulging portion 52 is a pair of membrane surfaces of the second rubber valve 28. 28B and 28C bulge from the film surface 28B on the side corresponding to the upstream side of the second sub-orifice 30 to the outer side R of the film surface 28B. As shown in FIG. 9, the bulging portions 52 and 52 of the pair of second rubber valves 28 and 28 are located at the center in the circumferential direction of the second connecting wall 40. In addition, the bulging part 52 does not necessarily need to be the center of the circumferential direction of the 2nd connection wall 40, and may shift | deviate from this center.

  As shown in FIGS. 4 to 6, a first main orifice forming member 60 for forming the main orifice 22 is disposed in the first liquid chamber 18. As shown in FIGS. 10 and 13, the first main orifice forming member 60 has an arc shape, and a first main orifice groove 64 communicating with the first liquid chamber 18 through the first opening 62 on the outer peripheral surface thereof. Is provided. At both ends of the first main orifice forming member 60, a pair of fitting protrusions 66 and 68 are formed so as to protrude outward along the circumferential direction. The first main orifice groove 64 opens from the first opening 62 at the center in the circumferential direction of the first main orifice forming member 60 toward the outside in the circumferential direction at one fitting protrusion 66 so as to communicate with the outside. Is formed.

  An arc-shaped second main orifice forming member 70 similar to the first main orifice forming member 60 is also arranged in the second liquid chamber 20, and as shown in FIGS. A second main orifice groove 74 communicating with the second liquid chamber 20 via the second opening 72 is provided on the surface, and a pair of fittings formed to protrude outward along the circumferential direction at both ends. Protrusions 76 and 78 are provided. Similar to the first main orifice groove 64, the second main orifice groove 74 opens from the second opening 72 toward the outer side in the circumferential direction at one fitting protrusion 76.

  In the present embodiment, the first main orifice forming member 60 and the second main orifice forming member 70 are the same parts having the same shape and size, and thus by making the parts common, productivity and parts are improved. The cost is improved. Further, as the shape of the first main orifice groove 64 and the second main orifice groove 74, for example, in order to further extend the orifice length, the groove extending in the circumferential direction is folded once or a plurality of times and then fitted into one. The projections 66 and 76 can be provided so as to communicate with the outside.

  The first main orifice forming member 60 and the second main orifice forming member 70 are fitted to the respective fitting recesses 48 and 54 by fitting the pair of fitting protrusions 66 and 68; 76 and 78 to the respective liquid chambers. 18 and 20 are arranged in a state of being spanned between the first press contact portion 44 and the second press contact portion 46 on both sides.

  Specifically, as shown in FIGS. 8, 9, and 13, the one fitting projection 66 of the first main orifice forming member 60 is fitted into the first fitting recess 48 of the first pressure contact portion 44, The other fitting projection 68 is fitted into the second fitting recess 54 of the second pressure contact portion 46. Also, as shown in FIGS. 8, 9, and 12, the one fitting protrusion 76 of the second main orifice forming member 70 is fitted into the first fitting recess 48 of the first pressure contact portion 44, and the other The fitting protrusion 78 is fitted into the second fitting recess 54 of the second pressure contact portion 46.

  The width of the one fitting projection 66, 76 and the first fitting recess 48 in which it fits is larger than the width of the other fitting projection 68, 78 and the second fitting recess 54 in which it fits. It is set large. Specifically, as shown in FIGS. 11 and 13, the width W11 of the one fitting protrusions 66 and 76 is set to be approximately the same as the width W10 of the first fitting recess 48 so that the fitting fits snugly. Further, the width W21 of the other fitting protrusions 68 and 78 is set to be approximately the same as the width W20 of the second fitting recess 54, so that the two fitting protrusions 68 and 78 can be fitted tightly. It has become so. The former widths W11 and W10 and the latter widths W21 and W20 are set to different dimensions, and in this embodiment, the fitting protrusion side having the opening ends 63 and 73 of the main orifice grooves 64 and 74 is arranged. The widths W11 and W10 are set larger.

  By assembling as described above, the outer peripheral surfaces of the first main orifice forming member 60 and the second main orifice forming member 70 are in pressure contact with the inner peripheral surface 14A of the outer cylinder 14, respectively. Further, in the first fitting recess 48 of the first pressure contact portion 44, the opening end 63 of the one fitting projection 66 of the first main orifice forming member 60 and the one fitting of the second main orifice forming member 70 are arranged. The opening end 73 of the mating protrusion 76 is abutted (see FIG. 8), and the first main orifice groove 64 and the second main orifice groove 74 are connected in communication. Thus, the main orifice 22 that communicates the first liquid chamber 18 and the second liquid chamber 20 is formed. The fitting recess 54 of the second press-contact portion 46 is not provided with a groove for forming an orifice in the fitting protrusions 68 and 78 inserted as described above, and the fitting recess 54 is a blocking portion. The first liquid chamber 18 and the second liquid chamber 20 are not communicated with each other in the fitting recess 54 because they are blocked at 58.

  As shown in FIGS. 4 and 6, inner stoppers 80 are provided in the first liquid chamber 18 and the second liquid chamber 20 so as to protrude radially outward from the inner cylinder 12 side. The inner stopper 80 is formed by covering a bulge portion provided over the entire circumference in the axially central portion of the inner cylinder 12 with a rubber film 82 integrally extending from the vibration-isolating base 16, and its tip The surface is formed into a convex curved surface. The inner stopper 80 may be formed in a protruding shape only on the first liquid chamber 18 and the second liquid chamber 20 side instead of the bulge shape of the entire circumference.

  In the first liquid chamber 18 and the second liquid chamber 20, outer stoppers 84 are provided on the radially outer side of the inner stopper 80, respectively. The outer stopper 84 is provided on each of the first main orifice forming member 60 and the second main orifice forming member 70, and radially inwardly facing the inner stopper 80 on the inner peripheral side of each member 60, 70. Protrusions are formed. The distal end surface of the outer stopper 84 facing the inner stopper 80 is formed in a concave curved surface having substantially the same curvature as that of the distal end surface of the inner stopper 80.

  As shown in FIGS. 7 to 9, a pair of rubber annular seal lips 86 and 88 extending in the circumferential direction are provided on the outer peripheral surfaces of the first and second fitting peripheral walls 34 and 36, respectively, at both ends in the axial direction. Is provided. Of these, the outer annular seal lip 86 is provided over the entire circumference in the circumferential direction. As shown in FIGS. 12 and 13, the inner annular seal lip 88 is provided over the entire circumference except for the notch portions 89 at only two locations facing the first liquid chamber 18. By providing the notch 89 in this way, the liquid that has entered between the two annular seal lips 86 and 88 when the liquid is sealed is inserted into the first liquid chamber 18 when the outer cylinder 14 is pressed into the press-fitting hole of the lower link. It can guide and can prevent the liquid leakage to the outside. Moreover, by opening only to the 1st liquid chamber 18 side, it can prevent that a liquid flows between both the liquid chambers 18 and 20 through the outer peripheral surface of the fitting surrounding walls 34 and 36. FIG.

  As shown in FIGS. 7 and 8, in the first pressure contact portion 44, one end in the width direction of the bulging portion 52 of the first rubber valve 24 provided in the first sub-orifice groove 50 adjacent to the first fitting peripheral wall 34. The first seal lip 90 made of rubber is connected to the side portion of the annular seal lip 88 on the inner side of the first fitting peripheral wall 34 and is vulcanized and formed on the outer peripheral surface 44 </ b> A of the first press-contact portion 44. Further, one end portion in the width direction of the bulging portion 52 of the first rubber valve 24 provided in the first sub-orifice groove 50 adjacent to the second fitting peripheral wall 36 and the inner annular shape of the second fitting peripheral wall 36. A rubber-made second seal lip 92 connected to the side of the seal lip 88 is vulcanized and formed on the outer peripheral surface 44 </ b> A of the first press-contact portion 44. The first seal lip 90, the bulging portion 52 of the pair of first rubber valves 24, and the second seal lip 92 are aligned in a straight line. As shown in FIG. 14, in the state before the first pressure contact portion 44 and the outer cylinder 14 are assembled, the bulging portion 52 of the first rubber valve 24 is formed on the outer peripheral surface 44 </ b> A (the outer cylinder 14) of the first pressure contact portion 44. Projecting radially outward S from the pressure contact surface of the first pressure contact portion 44 with respect to the inner peripheral surface 14A. Similarly, the annular seal lip 88 and the first and second seal lips 90 and 92 protrude outward from the outer peripheral surface 44A.

  As shown in FIG. 9, in the second pressure contact portion 46, one end portion in the width direction of the bulging portion 52 of the second rubber valve 28 provided in the second sub-orifice groove 56 adjacent to the first fitting peripheral wall 34, A third seal lip 94 made of rubber that is continuous with the side portion of the inner annular seal lip 88 of the first fitting peripheral wall 34 is vulcanized and formed on the outer peripheral surface 46 </ b> A of the second press-contact portion 46. Further, one end portion in the width direction of the bulging portion 52 of the second rubber valve 28 provided in the second sub-orifice groove 56 adjacent to the second fitting peripheral wall 36, and the inner annular shape of the second fitting peripheral wall 36. A rubber-made fourth seal lip 96 connected to the side of the seal lip 88 is vulcanized on the outer peripheral surface 46 A of the second press-contact portion 46. Furthermore, a rubber-made fifth seal lip 98 is formed on the outer peripheral surface of the blocking portion 58 and is located between the bulging portions 52 of the pair of second rubber valves 28. The third seal lip 94, the bulging portion 52 of the pair of second rubber valves 28, the fourth seal lip 96, and the fifth seal lip 98 are aligned in a straight line. As shown in FIG. 14, the bulging portion 52 of the second rubber valve 28 is more radial than the outer peripheral surface 46 </ b> A of the second pressure contact portion 46 before the second pressure contact portion 46 and the outer cylinder 14 are assembled. It protrudes outward S. Similarly, the annular seal lip 88 and the third, fourth, and fifth seal lips 94, 96, and 98 protrude outward from the outer peripheral surface 46A.

  The vibration isolator 10 of this embodiment is manufactured as follows. That is, a rubber molded body composed of the inner cylinder 12, the vibration isolation base 16 and the intermediate cylinder 32 is vulcanized and molded, and the resulting rubber molded body is fitted with the fitting peripheral walls 34 and 36 and the connecting walls 38 and 40 of the intermediate cylinder 32. By pressing the fitting recesses 48 and 54 and reducing the diameter of the intermediate cylinder 32, pre-compression is applied to the vibration-proof base 16. Next, as shown in FIG. 10, the main orifice forming members 60 and 70 are mounted, the outer cylinder 14 is covered with the liquid, the outer cylinder 14 is reduced in diameter, and both ends thereof are curled so that the vibration isolator 10 is can get.

  As shown in FIG. 15, the obtained vibration isolator 10 is configured such that the outer cylinder 14 is a press-fitting hole at the rear end of the lower link 1 with the axial direction (axial center O) of the inner cylinder 12 facing the vehicle vertical direction. The inner cylinder 12 is connected to the vehicle body frame. In this case, when the tire 2 is displaced in the front-rear direction T, a load in the direction perpendicular to the axis P in the left-right direction of the vehicle is input to the vibration isolator 10 and becomes the main load input direction. Therefore, the vibration isolator 10 is mounted so that the first liquid chamber 18 and the second liquid chamber 20 face each other in this direction P. On the other hand, when the tire 2 is displaced in the vertical direction, a force that tries to rotate around the line L passing through the connecting portion at the front and rear of the lower link 1 acts, so the vibration isolator 10 has an axis O of the inner cylinder 12. In contrast, a load in the twisting direction Q that causes the axis of the outer cylinder 14 to tilt is input (see FIG. 6).

  In the vibration isolator 10, when the hydraulic pressure difference between the first liquid chamber 18 and the second liquid chamber 20 is less than a set value, the first rubber valve 24 and the second rubber valve 28 are kept closed, and the interior of the main orifice 22 is maintained. The liquid flows and the vibration is absorbed by the flowing action. When the fluid pressure difference between the fluid chambers 18 and 20 becomes a set value, the fluid pressure on the first fluid chamber 18 side is high, and the fluid pressure on the second fluid chamber 20 side is low, the first rubber valve 24 is elastically deformed by the fluid pressure. Then, the liquid passes between the bulging portion 52 of the first rubber valve 24 and the inner peripheral surface 14 </ b> A of the outer cylinder 14, and the liquid flows from the first liquid chamber 18 to the second liquid chamber 20. As a result, the fluid pressure in the first fluid chamber 18 is lowered, so that the end wall 42 that is curved inwardly can be prevented from warping outward, and its durability can be prevented from decreasing. When the fluid pressure on the second fluid chamber 20 side is high and the fluid pressure on the first fluid chamber 18 side is low, the second rubber valve 28 is elastically deformed and opened by the fluid pressure, and the second rubber valve 28 bulges. The liquid passes between the portion 52 and the inner peripheral surface 14 </ b> A of the outer cylinder 14, and the liquid flows from the second liquid chamber 20 to the first liquid chamber 18. As a result, the hydraulic pressure in the second liquid chamber 20 is lowered, and similarly, the durability of the end wall 42 forming the second liquid chamber 20 is prevented from being lowered.

  Further, in the vibration isolator 10, the first main orifice forming member 60 and the second main orifice forming member 70 provided in the first liquid chamber 18 and the second liquid chamber 20 are used for the main orifice 22. A sufficient length of the orifice can be ensured, and the resulting fluid flow action can be exhibited effectively. Further, the first and second main orifice forming members 60 and 70 are excellent in assembling workability, and the widths of the fitting protrusion and the fitting recess are made different from each other at both ends. Assembling of 60 and 70 in the wrong direction can be prevented.

  Further, stoppers for limiting the relative displacement of the inner and outer cylinders 12 and 14 within a predetermined range are an inner stopper 80 from the inner cylinder 12 side and an outer stopper 84 from the first and second main orifice forming members 60 and 70. By dividing, it is possible to prevent the end wall 42 from being damaged at the time of displacement in the twisting direction Q. In particular, in this embodiment, although the end wall 42 is curved inward, contact between the end wall 42 and the stopper during displacement in the twisting direction Q can be effectively avoided. For such an operational effect, it is preferable to set the height (diameter dimension) of the outer stopper 84 to be equal to or greater than the height of the inner stopper 80.

  Furthermore, a bulging portion 52 that presses against the inner peripheral surface 14A of the outer cylinder 14 is formed on the top of the first rubber valve 24 and the second rubber valve 28 so as to bulge outward R. When the hydraulic pressure difference between the first and second fluid chambers 20 reaches a set value, the swollen portion 52 urges the swinging of the first rubber valve 24 or the second rubber valve 28 toward the opening side, and the opening speed thereof is increased. It becomes faster, and the time for lowering the hydraulic pressure difference between both liquid chambers to a desired value can be shortened.

  Further, when the first rubber valve 24 is kept in the closed state, the width of the first rubber valve 24 outwards between the outer peripheral surface 44A of the first pressure contact portion 44 and the inner peripheral surface 14A of the outer cylinder 14. The annular seal lip 88 and the first and second seal lips 90, 92 can prevent the liquid from flowing in the direction along the first sub-orifice 26. It is possible to avoid the problem that the first sub-orifice groove 50 is in a communicating state. Similarly, when the second rubber valve 28 is kept in the closed state, the second rubber valve 28 is located outside the second rubber valve 28 in the width direction between the outer peripheral surface 46A of the second press-contact portion 46 and the inner peripheral surface 14A of the outer cylinder 14. On the other side, the annular rubber seal lip 88 and the third, fourth and fifth seal lips 94, 96, 98 can prevent the liquid from flowing in the direction along the second sub-orifice 30, and the second rubber. A problem that the second sub-orifice groove 56 portions on both sides of the valve 28 are in communication can be avoided.

  Further, when the rubber valves 24 and 28 are molded by a molding die (not shown), a first mold disposed on one film surface side and a second mold disposed on the other film surface side are respectively provided. Although the mold is pulled out to the outside of the membrane surface, the bulging portion 52 of both the rubber valves 24 and 28 is formed on the side of the membrane surface corresponding to the upstream side of the sub-orifices 26 and 30 as described above. Since it bulges outward 24R from 24B, 28B, a part of the 1st type and the 2nd type is not caught on the bulging part 52 at the time of demolding, and demolding can be performed smoothly. Further, in the state before the outer cylinder 14 is assembled, the bulging portions 52 of both the rubber valves 24 and 28 are radially outward from the pressure contact surfaces of the pressure contact portions 44 and 46 with respect to the inner peripheral surface 14A of the outer cylinder 14. Therefore, the pressure contact force of the bulging portion 52 against the inner peripheral surface 14A of the outer cylinder 14 can be increased. Therefore, liquid leakage from between the bulging portion 52 and the inner peripheral surface 14A of the outer cylinder 14 when the hydraulic pressure difference is less than the set value can be prevented more reliably.

  In the above embodiment, the first pressure contact portion 44 is provided with two first sub-orifice grooves 50, 50, and the second pressure contact portion 46 is provided with two second sub-orifice grooves 56, 56. The second sub-orifice groove 56 may be provided in the first pressure contact portion 44, and the first sub-orifice groove 50 may be provided in the second pressure contact portion 46. Also, the first pressure contact portion 44 may be provided with the first and second sub-orifice grooves 50 and 56, and the second pressure contact portion 46 may be provided with the first and second sub-orifice grooves 50 and 56. In addition, only one of the first sub-orifice groove 50 and the second sub-orifice groove 56 can be provided in each pressure contact portion 44, 46.

The side view of the liquid enclosure type vibration isolator which concerns on one Embodiment of this invention. II-II sectional view taken on the line of FIG. The front view of the vibration isolator. IV-IV sectional view taken on the line of FIG. VV sectional view taken on the line of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 3. The front view which shows the state before attaching a main orifice formation member to the rubber molding containing the inner cylinder and intermediate | middle cylinder of the vibration isolator. The front view which shows the state after the assembly | attachment of FIG. The figure which looked at the state of FIG. 8 from back. The side view which shows the state before attaching a main orifice formation member to this rubber molding. The front view which shows the state before attaching a main orifice formation member to this rubber molding. The front view which shows the state after the assembly | attachment of FIG. The figure which looked at the state of FIG. 12 from back. The figure which shows a rubber valve. Schematic which shows the mounting state to the vehicle of the said vibration isolator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator, 12 ... Inner cylinder, 12A ... Outer peripheral surface of inner cylinder, 14 ... Outer cylinder, 14A ... Inner peripheral surface of outer cylinder, 16 ... Antivibration base, 18 ... First liquid chamber, 20 2nd fluid chamber, 22 ... Main orifice, 24 ... 1st rubber valve, 24A ... Top part of 1st rubber valve, 24B, 24C ... Film surface of 1st rubber valve, 26 ... 1st suborifice, 28 ... 2nd Rubber valve, 28A: Top portion of second rubber valve, 28B, 28C ... Film surface of second rubber valve, 30 ... Second suborifice, 32 ... Intermediate cylinder, 34 ... First fitting peripheral wall, 36 ... Second fitting Peripheral wall, 38 ... first connection wall, 38A ... inner side surface of first connection wall, 38B ... outer surface of first connection wall, 40 ... second connection wall, 40A ... inner side surface of second connection wall, 40B ... second connection Outer wall surface, 42 ... end wall, 44 ... first press contact part, 44A ... outer peripheral surface of first press contact part, 46 ... second press contact part, 46A ... outer peripheral surface of second press contact part 48 ... first fitting recess, 50 ... first sub-orifice groove, 52 ... bulging portion, 54 ... second fitting recess, 56 ... second sub-orifice groove, 58 ... blocking portion, 60 ... first main orifice formation Member, 62 ... first opening, 64 ... first main orifice groove, 66, 68 ... fitting protrusion of the first main orifice forming member, 70 ... second main orifice forming member, 72 ... second opening, 74 ... first 2 main orifice groove, 76, 78 ... fitting protrusion of the second main orifice forming member, 80 ... inner stopper, 84 ... outer stopper, 88 ... annular seal lip, 90 ... first seal lip, 92 ... second seal lip 94 ... third seal lip, 96 ... fourth seal lip

Claims (6)

An inner cylinder (12), an outer cylinder (14) surrounding the inner cylinder in an axially parallel manner, a vibration-proof base (16) made of a rubber-like elastic body interposed between the inner cylinder and the outer cylinder, and the inner cylinder An intermediate cylinder (32) positioned between the first cylinder and the outer cylinder, a first liquid chamber (18) and a second liquid chamber (20) positioned across the inner cylinder, the first liquid chamber and the second liquid chamber A main orifice (22) for communicating with
The intermediate cylinder (32) is positioned between a pair of ring-shaped fitting peripheral walls (34, 36) on both end sides in the axial direction to which the outer cylinder is fitted, and the inner cylinder between the fitting peripheral walls. A pair of connecting walls (38, 40) that are located on the radially inner side and connect the pair of fitting peripheral walls.
The anti-vibration base (16) combines the inner surface (38A, 40A) of the pair of connecting walls and the outer peripheral surface (12A) of the inner cylinder facing the inner surface, and the first liquid chamber The second liquid chamber is partitioned in the circumferential direction, and end walls (42, 42) made of a rubber-like elastic body are provided between the pair of fitting peripheral walls and the inner cylinder, A wall forms a chamber wall at an axial end of the first liquid chamber and the second liquid chamber;
A first pressure contact portion (44) made of a rubber-like elastic body that is in pressure contact with the inner peripheral surface of the outer cylinder is provided on the outer surface (38B) side of one of the connecting walls, and a first fitting is performed on the first pressure contact portion. A recess (48) is provided, and a second press-contact portion (46) made of a rubber-like elastic body that presses against the inner peripheral surface of the outer cylinder is provided on the outer surface (40B) side of the other connecting wall. A second fitting recess (54) is provided in the two pressure contact parts,
A first main orifice forming member (60) having a first main orifice groove (64) communicating with the first liquid chamber through a first opening (62) in the outer periphery of the first liquid chamber (18). Are provided, and fitting protrusions (66, 68) are provided at both ends in the circumferential direction of the first main orifice forming member, and the first main orifice groove is surrounded by one of the fitting protrusions (66). Opening toward the outside of the direction,
The first main orifice forming member has the one fitting projection (66) as the first fitting recess (48) and the other fitting projection (68) as the second fitting recess (54). ) Are respectively fitted to each other in the first liquid chamber (18) so as to be spanned between the first press contact portion (44) and the second press contact portion (46) on both sides, The outer peripheral surface of the first main orifice forming member (60) is in pressure contact with the inner peripheral surface of the outer cylinder (14), and the first main orifice groove (64) is in the second press contact portion (44). The main orifice (22) is formed by communicating with the liquid chamber (20) side,
The width of the first fitting recess (48) and the one fitting projection (66) that fits into the first fitting recess is equal to the second fitting recess (54) and the second fitting recess. A liquid-filled vibration isolator having a size different from the width of the other fitting protrusion (68) fitted to the outer wall.   An inner stopper (80) protruding radially outward from the inner cylinder (12) side is provided in the first liquid chamber (18), and the first main orifice forming member (60) The liquid-filled vibration isolator according to claim 1, further comprising an outer stopper (84) that protrudes inward in the radial direction so as to face the inner stopper. A second main orifice forming member (70) having a second main orifice groove (74) communicating with the second liquid chamber through a second opening (72) in the outer peripheral surface in the second liquid chamber (20). Are provided, and fitting protrusions (76, 78) are provided at both ends in the circumferential direction of the second main orifice forming member, and the second main orifice groove is formed around one of the fitting protrusions (76). Opening toward the outside of the direction,
The second main orifice forming member has the one fitting projection (76) as the first fitting recess (48) and the other fitting projection (78) as the second fitting recess (54). ) Are respectively fitted in the second liquid chamber (20), and are arranged in a state of being spanned between the first press contact part (44) and the second press contact part (46) on both sides, The outer peripheral surface of the second main orifice forming member (70) is brought into pressure contact with the inner peripheral surface of the outer cylinder (14), and the first main orifice groove (64) and the second main surface in the first press contact portion (44). The main orifice (22) is formed by communicating with the main orifice groove (74),
The width of the first fitting recess (48) and the one fitting protrusion (76) fitted into the first fitting recess is equal to the second fitting recess (54) and the second fitting recess. The liquid-filled vibration isolator according to claim 1 or 2, wherein the other fitting protrusion (78) fitted to the width is set to a different size.   An inner stopper (80) protruding radially outward from the inner cylinder (12) side is provided in the second liquid chamber (20), and the second main orifice forming member (70) 4. The liquid filled type vibration damping device according to claim 3, further comprising an outer stopper (84) that protrudes inward in the radial direction so as to face the inner stopper. A first sub-orifice (26) through which liquid flows only from the first liquid chamber side to the second liquid chamber side via the first rubber valve (24), and the second via the second rubber valve (28). A second sub-orifice (30) for allowing the liquid to flow only from the liquid chamber side to the first liquid chamber side,
A first sub-orifice groove (50) extending in the circumferential direction is provided in at least one of the first pressure-contact portion and the second pressure-contact portion, and between the first sub-orifice groove and the inner peripheral surface of the outer cylinder. The first sub-orifice (26) is formed;
A second sub-orifice groove (56) extending in the circumferential direction is provided in at least one of the first press-contact portion and the second press-contact portion, and between the second sub-orifice groove and the inner peripheral surface of the outer cylinder. The second sub-orifice (30) is formed;
The first sub-orifice groove (50) is provided with the rubber film-shaped first rubber valve (24) so that the top (24A) of the first rubber valve is in pressure contact with the inner peripheral surface of the outer cylinder. Configured, the first rubber valve is formed in an inclined posture located on the downstream side of the first sub-orifice (26) toward the top side,
The second sub-orifice groove (56) is provided with the rubber film-like second rubber valve (28) so that the top (28A) of the second rubber valve is in pressure contact with the inner peripheral surface of the outer cylinder. And the second rubber valve is formed in an inclined posture located on the downstream side of the second sub-orifice (30) toward the top side,
A bulging portion (52) having an arcuate cross section that is in pressure contact with the inner peripheral surface of the outer cylinder is formed on the top portions of the first rubber valve and the second rubber valve over the entire width of the top rubber portion. The bulging portion extends from the membrane surface (24B) on the side corresponding to the upstream side of the first sub-orifice of the pair of membrane surfaces (24B, 24C) of the first rubber valve to the outer side (R ) And the bulging portion of the second rubber valve has a membrane surface (28B) on the side corresponding to the upstream side of the second sub-orifice of the pair of membrane surfaces (28B, 28C) of the second rubber valve. The liquid filled type vibration damping device according to claim 1, wherein the liquid filled type vibration damping device bulges outward (R) from the film surface. The first press contact portion (44) is provided with the first fitting recess (48) in the axial center portion, and the first sub-orifice groove (50) is provided on at least one side of both sides of the first fitting recess. ) And one end in the width direction of the bulging portion (52) of the first rubber valve (24) provided in the first sub-orifice groove, and a circumference provided on the outer peripheral surface of the fitting peripheral wall. A rubber seal lip (90) connected to a side portion of a rubber annular seal lip (88) extending in a direction is formed on an outer peripheral surface of the first pressure contact portion;
The second press-contact portion (46) is provided with the second fitting recess (54) in the axially central portion, and the second sub-orifice groove (56) on at least one side of both sides of the second fitting recess. ) And one end in the width direction of the bulging portion (52) of the second rubber valve (28) provided in the second sub-orifice groove, and a circumference provided on the outer peripheral surface of the fitting peripheral wall. 6. A rubber seal lip (94) connected to a side portion of a rubber annular seal lip (88) extending in a direction is formed on an outer peripheral surface of the second press-contact portion. Liquid-filled vibration isolator.

Images