JP2019060393A - Axial direction input type fluid-encapsulated cylindrical vibration control device - Google Patents

Abstract

To provide an axial direction input type fluid-encapsulated cylindrical vibration control device in a novel structure capable of realizing excellent vibration control performance while reducing the number of vulcanized moldings.SOLUTION: A main body rubber elastic body 16 fixed to an inner shaft member 12 comprises outer wall rubbers 40 and 42 and a partition wall rubber 46, and fluid chambers 68 and 70 are provided at both sides of the partition wall rubber 46 in an axial direction. In an intermediate sleeve 20 fixed to the main body rubber elastic body 16, on the other hand, annular parts 22 and 24 that are fixed to the outer wall rubbers 40 and 42, at both sides in the axial direction and coupling parts 26 and 28 which couple the annular parts 22 and 24 are formed. Circumferential groove parts 58 and 59 extending in the annular parts 22 and 24 in a circumferential direction and fluid chamber connection groove parts 60 and 61 extending to the coupling parts 26 and 28 and connecting the circumferential groove parts 58 and 59 to the fluid chambers 68 and 70 are formed on an outer peripheral surface of the intermediate sleeve 20. The circumferential groove parts 58 and 59 and the fluid chamber connection groove parts 60 and 61 are covered by an outer cylinder member 14, and an orifice passage 72 is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid-filled cylindrical vibration damping device applied to a cab mount of an automobile, and more particularly to an axial direction input fluid-filled cylindrical vibration damping device that exhibits vibration damping performance against an axial input. It is a thing.

  BACKGROUND ART Conventionally, an axial input type fluid-filled cylindrical vibration-damping device applied to a cab mount or the like of an automobile is known. As shown in Japanese Patent No. 5552059 (Patent Document 1) and the like, an axial input type fluid-filled cylindrical vibration-damping device is formed by inserting an inner shaft member into an outer cylinder member, and the inner shaft members And the outer cylinder member are connected by the main rubber elastic body, and two fluid chambers are provided on both sides in the axial direction in which relative pressure fluctuation is generated at the time of axial vibration input, and these fluid chambers are mutually It has a structure in which an orifice passage that communicates is provided.

  By the way, the axial direction input type fluid-filled cylindrical vibration damping device disclosed in Patent Document 1 includes a partition rubber separating two fluid chambers, and an orifice forming an orifice passage in the inner peripheral portion of the partition rubber. It has a structure in which the members are fixed.

  However, in the structure of Patent Document 1, the partition wall rubber is separated from the outer wall rubbers on both sides in the axial direction that constitute the main rubber elastic body, and the outer wall rubbers forming the axial wall portions of the two fluid chambers are added. Since the vulcanized molded product and the vulcanized molded product of the partition wall rubber become separate parts from each other, the number of parts increases, and there is a problem that the number of processes increases in the vulcanization molding process and the assembly process.

  Further, in the structure of Patent Document 1, since the orifice member forming the orifice passage is provided on the inner peripheral portion of the partition rubber, it is difficult to secure a long passage length of the orifice passage extending in the circumferential direction. In order to obtain the vibration effect effectively, it was easy to narrow the frequency range in which the orifice passage can be tuned.

Patent 5552059 gazette

  The present invention has been made against the background described above, and the problem to be solved is a novel structure capable of realizing excellent vibration-proofing performance while reducing the number of parts of a vulcanized molded article. It is an object of the present invention to provide a fluid filled cylindrical vibration damping device of the axial input type.

  The following describes aspects of the present invention made to solve such problems. In addition, the component employ | adopted in each aspect described below can be employ | adopted as much as possible in arbitrary combination.

  That is, in the first aspect of the present invention, the inner shaft member and the outer cylindrical member are connected by the main rubber elastic body, and provided on both sides in the axial direction to cause relative pressure fluctuation at the time of axial vibration input. In the axial direction input fluid-sealed cylindrical vibration-damping device having a plurality of fluid chambers and an orifice passage communicating the fluid chambers, the main rubber elastic body is fixed to the inner shaft member. The outer wall rubber on both sides in the axial direction and the partition rubber in the middle portion in the axial direction, and the fluid chambers are provided on both sides in the axial direction of the partition rubber, A sleeve is fixed, and in the intermediate sleeve, an annular portion on both sides in the axial direction fixed to the outer peripheral surface of the outer wall rubber and a connecting portion for connecting the annular portion on both sides in the axial direction are formed. On the outer peripheral surface of the intermediate sleeve A circumferential groove extending in the circumferential direction of the annular portion; and a fluid chamber connecting groove extending from the circumferential groove to the connecting portion and connecting the circumferential groove to the plurality of fluid chambers. The orifice passage is formed by covering the circumferential groove and the fluid chamber connection groove with the outer cylinder member.

  According to the fluid input type cylindrical vibration isolation device of the axial direction input type having the structure according to the first aspect, the main rubber elastic body comprises the outer wall rubber on both sides in the axial direction and the partition rubber in the axial intermediate portion. By having them, the outer wall rubber and the partition rubber can be formed as one vulcanized molded product. Therefore, as compared with the conventional structure in which the outer wall rubber and the partition rubber are separated, the number of vulcanized molded articles can be reduced, and the number of steps of vulcanization molding can be reduced, and the parts The reduction of points also simplifies the assembly process.

  Further, since the orifice passage is formed by covering the circumferential groove formed on the outer peripheral surface of the intermediate sleeve and the opening of the fluid chamber connection groove with the outer cylindrical member, the orifice passage is formed. There is no need to provide an orifice member. Moreover, by providing the orifice passage so as to extend on the outer peripheral surface of the intermediate sleeve, the passage length of the orifice passage can be easily secured long, and the tuning frequency of the orifice passage can be set with a large degree of freedom. The vibration damping effect by the passage can be effectively obtained. In addition, since the circumferential groove is connected to the fluid chamber by the fluid chamber connecting groove extending out to the connecting portion, the passage length of the orifice passage can be easily secured longer by the fluid chamber connecting groove.

  According to a second aspect of the present invention, in the axial input type fluid-filled cylindrical anti-vibration device described in the first aspect, an axial direction between the annular portions on both axial sides of the intermediate sleeve is An intermediate fixing portion fixed to the outer peripheral surface of the partition rubber is formed.

  According to the second aspect, the outer peripheral surface of the partition rubber is fixed to the intermediate fixing portion of the intermediate sleeve, whereby the outer peripheral end of the partition rubber is firmly fixed to the outer cylindrical member side, and the vibration in the axial direction is input. On the other hand, the internal pressure fluctuation of the fluid chamber formed between the outer wall rubber and the partition rubber is stably induced.

  According to a third aspect of the present invention, in the axial direction input fluid-filled cylindrical vibration-damping device described in the first or second aspect, a partition reinforcing portion in which the inner shaft member is fixed to the partition rubber Are provided.

  According to the third aspect, the amount of deformation of the partition rubber with respect to the vibration input in the axial direction is limited by the partition reinforcing portion, and the difference between the amounts of deformation of the outer wall rubber and the partition rubber becomes large. It is produced bigger. Thereby, the fluid flow between the fluid chambers through the orifice passage is efficiently generated, and the vibration damping effect by the fluid flow action is advantageously exhibited.

  According to a fourth aspect of the present invention, in the axial direction input fluid-filled cylindrical anti-vibration device described in any one of the first to third aspects, the circumferential groove portion has the annular shape on both sides in the axial direction. It is formed in the part.

  According to the fourth aspect, by forming the orifice passage by including the circumferential grooves respectively provided in the annular portions on both axial sides, it is possible to obtain an orifice passage having a long passage length in a space efficient manner.

  According to a fifth aspect of the present invention, in the axial direction input fluid-filled cylindrical vibration damping device described in any one of the first to fourth aspects, the intermediate sleeve includes three central axes. Is considered to be a rotationally symmetric object of 180 ° with respect to each of the above.

  According to the fifth aspect, for example, when setting the intermediate sleeve in the mold for vulcanizing and forming the main body rubber elastic body, the orientation of the intermediate sleeve can be easily determined.

  In the intermediate sleeve of the structure according to the present embodiment, for example, the circumferential groove is formed in the annular portion on both sides in the axial direction, and the fluid chamber connection groove portion is formed in the rubber elastic body fixed on the outer peripheral surface of the connecting portion. Can be obtained by

  According to the present invention, the main rubber elastic body connecting the inner shaft member and the outer cylindrical member has the outer wall rubber on both axial sides constituting the wall portion of the fluid chamber and the partition rubber in the axial middle portion. The outer wall rubber and the partition rubber are formed as one vulcanized molded product. Therefore, as compared with the conventional structure in which the outer wall rubber and the partition rubber are separated, the number of vulcanized molded articles can be reduced, and the number of steps of vulcanization molding can be reduced, and the parts The reduction of points also simplifies the assembly process. In addition, since the orifice passage is formed by covering the circumferential groove formed on the outer peripheral surface of the intermediate sleeve and the opening of the fluid chamber connection groove with the outer cylindrical member, a special method for forming the orifice passage is provided. It is possible to form an orifice passage having a long passage length without providing an orifice member, and it is possible to effectively obtain the vibration damping effect by the orifice passage while setting the tuning frequency of the orifice passage with a large degree of freedom.

FIG. 1 is a cross-sectional view showing a lower mount as a first embodiment of the present invention. II-II sectional drawing of FIG. III-III sectional drawing of FIG. FIG. 2 is a perspective view of an intermediate sleeve that constitutes the lower mount shown in FIG. 1; FIG. 5 is a front view of the intermediate sleeve shown in FIG. 4; FIG. 5 is a right side view of the intermediate sleeve shown in FIG. 4; VII-VII sectional drawing of FIG. VIII-VIII sectional drawing of FIG. FIG. 2 is a perspective view of an integrally vulcanized molded product constituting the lower mount shown in FIG. 1; FIG. 10 is a plan view of the integrally vulcanized molded article shown in FIG. 9; The front view of the integral vulcanization molded article shown in FIG. FIG. 10 is a rear view of the integrally vulcanized molded article shown in FIG. 9; FIG. 10 is a right side view of the integrally vulcanized molded article shown in FIG. 9; The left view of the integral vulcanization molded article shown in FIG. XV-XV sectional drawing of FIG. XVI-XVI sectional drawing of FIG. XVII-XVII sectional drawing of FIG. XVIII-XVIII sectional drawing of FIG. Sectional drawing of the integrally vulcanized molded article which comprises the lower side mount as another one Embodiment of this invention.

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

  FIGS. 1 to 3 show a lower mount 10 constituting a cab mount as a first embodiment of an axial direction input fluid-filled cylindrical vibration-damping device having a structure according to the present invention. The lower mount 10 has a structure in which the inner shaft member 12 and the outer cylindrical member 14 are elastically connected by the main rubber elastic body 16. In the following description, the up and down direction basically refers to the up and down direction in FIG. 1 which is the axial direction.

  More specifically, the inner shaft member 12 is formed of metal or the like, and has a substantially cylindrical shape with a small diameter extending linearly. Further, at an axially intermediate portion of the inner shaft member 12, a reinforcing plate member 18 as a partition reinforcing portion projecting to the outer periphery is fixed. The reinforcing plate member 18 of the present embodiment is a hard member formed of a synthetic resin, metal or the like, has a substantially annular plate shape, and is fixed to the inner shaft member 12 in an externally fitted state. Thus, the inner shaft member 12 projects from the outer peripheral surface of the inner shaft member 12 to the outer periphery over the entire periphery.

  Furthermore, the inner shaft member 12 is disposed to be inserted into the intermediate sleeve 20. As shown in FIGS. 4-8, the intermediate sleeve 20 has a thin-walled large-diameter, substantially cylindrical shape, and upper and lower annular portions 22 and 24 provided on both sides in the axial direction, and the upper and lower annular portions 22, A pair of front and rear connecting portions 26, 28 are provided to connect the two 24 together. Further, between the circumferential direction of the pair of connecting portions 26 and 28 in the intermediate sleeve 20, a pair of window portions 29a and 29b penetrating in the left-right direction is formed.

  The axially outer end portions of the upper and lower annular portions 22 and 24 and the opening edge portions of the pair of window portions 29a and 29b are expanded in diameter and project outward. Thus, the upper and lower annular portions 22 and 24 are groove-shaped at a portion deviating in the circumferential direction from the connection portion to the connecting portions 26 and 28, and the upper and lower annular portions 22 and 24 extend in the circumferential direction on the outer peripheral surface of the intermediate sleeve 20. The circumferential grooves 30, 32 are provided. The outer peripheral surfaces of the pair of connecting portions 26 and 28 are at substantially the same radial positions as the bottom wall surfaces of the upper and lower circumferential grooves 30 and 32 in the upper and lower annular portions 22 and 24. The surface and the bottom wall surfaces of the upper and lower circumferential grooves 30, 32 are smoothly continuous without any step or the like.

  Furthermore, between the axial directions of the upper and lower annular parts 22 and 24 in the intermediate sleeve 20, intermediate fixed parts 34a and 34b extending so as to straddle each one of the windows 29a and 29b in the circumferential direction are provided. Both circumferential end portions of the intermediate fixing portion 34 are connected to one of the pair of connecting portions 26 and 28. Further, by providing the intermediate fixing portion 34 in each window portion 29, each window portion 29 is divided into upper and lower portions by the intermediate fixing portion 34. The outer peripheral surfaces of the intermediate fixing portions 34a and 34b are with respect to the outer peripheral surfaces of the axially outer end portions expanded in the upper and lower annular portions 22 and 24 and the upper and lower opening edges of the pair of windows 29a and 29b. In the radial direction, they are at substantially the same position and project outward from the outer peripheral surface of the connecting portions 26 and 28.

  The intermediate sleeve 20 is disposed outside the inner shaft member 12, and a main rubber elastic body 16 is disposed between the inner shaft member 12 and the intermediate sleeve 20 in the radial direction. The main rubber elastic body 16 has a generally cylindrical shape as a whole as shown in FIGS. 9 to 18, and the inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner shaft member 12, and the outer peripheral surface is intermediate It is vulcanized and bonded to the inner peripheral surface of the sleeve 20. Thus, the main rubber elastic body 16 of the present embodiment is formed as an integrally vulcanized molded article 36 including the inner shaft member 12 and the intermediate sleeve 20.

The intermediate sleeve 20 of this embodiment includes a vertical central axis l ₁ shown in FIG. 7, a longitudinal center axis l ₂ of Figure 8 which extends back and forth up and down the center, left and right center axis of Figure 8 extending to the left and right upper and lower central It is considered to be a 180 ° rotational symmetric body with respect to each of three orthogonal axes with l ₃ . Thus, for example, when the intermediate sleeve 20 is set in a mold for vulcanization molding of the main rubber elastic body 16 and the main rubber elastic body 16 is vulcanized and formed, the intermediate sleeve 20 is oriented in the correct direction and the gold for vulcanization molding is formed. The work of setting in the mold becomes easy.

  The body rubber elastic body 16 is provided with a pair of pocket portions 38a and 38b corresponding to the pair of window portions 29a and 29b so as to open toward both sides in the radial direction. The opening edges of the pockets 38a and 38b in the main rubber elastic body 16 are fixed to the opening edges of the windows 29a and 29b, and the pockets 38a and 38b are opened to the outer peripheral side through the windows 29a and 29b. ing.

  Further, in the main rubber elastic body 16, portions constituting wall portions on both sides in the axial direction of the pocket portions 38a and 38b are upper and lower outer wall rubbers 40 and 42, and annular portions of the inner shaft member 12 and the intermediate sleeve 20 It extends continuously between 22 and 24 in the radial direction. The outer wall rubbers 40 and 42 according to the present embodiment are flat surfaces extending in the axial direction substantially in the axial direction, and the recessed portions 44 are provided on the outer surface in the axial direction, and the recessed portions 44 are formed. In the portion, the thickness dimension is reduced, and the axially outer surface is a tapered surface which inclines inward axially toward the outer periphery.

  Further, a partition rubber 46 which extends in a direction substantially perpendicular to the axis is provided between the upper and lower outer wall rubbers 40 and 42 in the main rubber elastic body 16 in the axial direction. The partition rubber 46 is provided between the inner shaft member 12 and the intermediate fixing portions 34 a and 34 b of the intermediate sleeve 20 in the radial direction, and the inner peripheral end is fixed to the inner shaft member 12 and the outer peripheral end is It is fixed to the intermediate fixing portions 34 a and 34 b of the intermediate sleeve 20. Further, a reinforcing plate member 18 fixed to the inner shaft member 12 is fixed in a buried state to the inner peripheral portion of the partition rubber 46 so that the deformation rigidity of the inner peripheral portion of the partition rubber 46 is enhanced by the reinforcing plate member 18 It is done.

  The pocket portions 38 a and 38 b are respectively divided into upper and lower portions by the partition rubber 46, and a pair of upper and lower upper groove-shaped portions 48 a and 48 b are formed on the upper side of the partition rubber 46. A pair of left and right lower groove portions 50a, 50b are formed.

  Further, upper communication holes 52, 52 are formed in the upper groove-shaped portions 48a, 48b. The upper communication hole 52 is a hole which penetrates the bottom wall portion of the upper groove portions 48a and 48b in the radial direction (vertical direction in FIG. 18) in which the upper groove portions 48a and 48b are disposed. In this case, two are formed apart in the length direction (the left and right direction in FIG. 18) of the upper groove shaped portions 48a and 48b. Similarly, lower communication holes 54, 54 having substantially the same structure as the upper communication holes 52, 52 of the upper groove portions 48a, 48b are formed in the lower groove portions 50a, 50b.

  Further, groove forming rubbers 56 and 57 of the main rubber elastic body 16 are fixed to the outer peripheral surface of the connecting portions 26 and 28 of the intermediate sleeve 20. The upper circumferential groove 30 is divided into two in the circumferential direction by the groove forming rubbers 56 and 57, and a circumferential groove 58a and a circumferential groove 58b are formed, each having a length of less than a half circumference. Further, a part of the lower circumferential groove 32 in the circumferential direction is separated in the circumferential direction by the groove forming rubber 57, and a circumferential groove portion 59 having a C-shape as a whole is formed.

  Further, as shown in FIG. 11, the groove forming rubber 56 is formed with a connecting groove 60 connecting one circumferential end of the upper circumferential groove 58a and one circumferential end of the upper groove 48a. A connection groove 61 is formed to connect the other circumferential end of the upper circumferential groove 58b and the other circumferential end of the lower groove 50b. On the other groove forming rubber 57, as shown in FIG. 12, a connection groove 62 connecting the other end in the circumferential direction of the upper circumferential groove portion 58a and the other end in the circumferential direction of the lower circumferential groove portion 59 is formed A connection groove 64 is formed which connects one circumferential end of the upper circumferential groove 58b and one circumferential end of the lower circumferential groove 59b.

  In short, the upper circumferential grooves 58a and 58b, the lower circumferential grooves 59, the upper grooves 48a and 48b, and the lower grooves 50a and 50b are formed by the connection grooves 60, 61, 62 and 64, respectively. It is connected in series.

  The upper and lower annular portions 22 and 24 of the intermediate sleeve 20 are fixed to the outer wall rubbers 40 and 42 on both sides in the axial direction of the main rubber elastic body 16, and the outer peripheral surfaces of the upper and lower annular portions 22 and 24 The groove inner surfaces of the circumferential groove portions 58 and 59 and the opening edge portions on both axial direction both end portions and the axial direction both sides of the window portions 29a and 29b are exposed from the outer wall rubbers 40 and 42. Further, the outer peripheral surfaces of the intermediate fixing portions 34 a and 34 b are exposed from the partition rubber 46 of the main rubber elastic body 16.

  The outer cylindrical member 14 is mounted on the integrally vulcanized molded product 36 of the main rubber elastic body 16 having such a structure. The outer cylindrical member 14 has a thin-walled, large-diameter, substantially cylindrical shape as shown in FIGS. 1 to 3, and a seal rubber layer 66 is formed on the inner peripheral surface.

  Then, the outer cylindrical member 14 is subjected to diameter reduction processing such as octagonal drawing in a state of being extrapolated to the integrally vulcanized molded product 36 of the main body rubber elastic body 16 to configure the integrally vulcanized molded product 36 Is fitted onto the outer peripheral surface of the intermediate sleeve 20. Further, a seal rubber layer 66 is disposed between the inner peripheral surface of the outer cylindrical member 14 and the outer peripheral surface of the intermediate sleeve 20, and the seal rubber layer 66 is a fluid between the fitting surfaces of the outer cylindrical member 14 and the intermediate sleeve 20. It is tightly sealed.

  In this embodiment, in addition to the annular portions 22 and 24 fixed to the outer peripheral surface of the outer wall rubbers 40 and 42, the intermediate sleeve 20 includes intermediate fixed portions 34a and 34b fixed to the outer peripheral surface of the partition rubber 46 Since the outer cylinder member 14 is fixed to the outer peripheral end of the outer wall rubbers 40 and 42, the outer cylindrical member 14 is also fixed to the outer peripheral end of the partition rubber 46.

  Further, as shown in FIG. 1, the outer peripheral openings of the upper groove-shaped portions 48a and 48b are closed in a fluid-tight manner by the attachment of the outer cylindrical member 14, and the upper fluid chambers 68a and 68b are formed. In the present embodiment, the upper fluid chambers 68a and 68b formed on both sides in the radial direction communicate with each other through the upper communication holes 52 and 52, and substantially constitute one fluid chamber (see FIG. 3). ).

  Further, the outer peripheral openings of the lower groove-shaped portions 50a and 50b are closed in a fluid-tight manner by the attachment of the outer cylindrical member 14, and the lower fluid chambers 70a and 70b are formed, and the upper fluid chambers 68a and 68b and the lower are formed. The side fluid chambers 70 a and 70 b are provided on both sides in the axial direction of the partition rubber 46. In the present embodiment, the lower fluid chambers 70a and 70b formed on both sides in the radial direction communicate with each other through the lower communication holes 54 and 54, and substantially constitute one fluid chamber.

  The upper fluid chambers 68a and 68b and the lower fluid chambers 70a and 70b according to the present embodiment are both configured by the main rubber elastic body 16 at a part of the wall portion, and a pressure receiving chamber that causes internal pressure fluctuation at the time of vibration input It is done. Incompressible fluid is enclosed in the upper fluid chambers 68a and 68b and the lower fluid chambers 70a and 70b. The filling fluid is not particularly limited, but is preferably a low viscosity liquid such as water, ethylene glycol, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof.

  Further, circumferential grooves 58 and 59 provided on the upper and lower annular portions 22 and 24 of the intermediate sleeve 20 and connection grooves 60 provided on the coupling portions 26 and 28 of the intermediate sleeve 20 by the groove forming rubbers 56 and 57, The outer peripheral openings 61, 62 and 64 are closed in a fluid-tight manner by the attachment of the outer cylindrical member 14. As a result, an orifice passage 72 for connecting the upper fluid chamber 68a and the lower fluid chamber 70b to each other is constituted by the upper and lower circumferential groove portions 58, 59 and the connection grooves 60, 61, 62, 64. The orifice passage 72 is appropriately tuned by adjusting the ratio of the passage cross sectional area to the passage length, which is the resonance frequency of the fluid flow. Further, in the present embodiment, the fluid chamber connection grooves extending to the connecting portions 26 and 28 and connecting the upper and lower circumferential grooves 58 and 59 to the fluid chambers 68 and 70 are the upper circumferential groove 58a and the upper fluid chamber 68a. And a connection groove 61 connecting the upper circumferential groove 58b and the lower fluid chamber 70b.

  An upper axial direct orifice passage is formed by upper communication holes 52, 52 communicating upper fluid chambers 68a, 68b formed on both sides in the radial direction, and lower fluid chambers 70a, 70b formed on both sides in the radial direction. The lower communicating holes 54, 54 can communicate with each other to form a lower axial straight orifice passage. According to this, it is also possible to obtain the vibration isolation effect by the axial straight orifice passage with respect to the radial vibration input in which the upper fluid chambers 68a and 68b and the lower fluid chambers 70a and 70b are disposed.

  In the lower mount 10 having such a structure, the inner shaft member 12 is attached to a cab housing of an automobile by a fixing bolt (not shown) inserted through the inner hole, and the outer cylindrical member 14 is For example, it is mounted on a vehicle by being mounted on a vehicle body via a bracket (not shown). In addition to the lower mount 10, the cab mount may be provided with an upper mount that mainly supports an axial load, depending on required characteristics and the like. That is, an upper mount such as the cab mount load support body mount (102) disclosed in Japanese Patent No. 5552059 may be disposed between the cab housing and the upper and lower of the vehicle body.

  In the vehicle mounted state, when axial vibration is input, the hydraulic pressure difference between the upper fluid chamber 68 and the lower fluid chamber 70 is caused by the difference in the amount of deformation between the outer wall rubbers 40 and 42 and the partition rubber 46. Is born. The fluid flow based on the hydraulic pressure difference between the upper and lower fluid chambers 68 and 70 is generated in the orifice passage 72 which connects the upper fluid chamber 68 and the lower fluid chamber 70 to each other, thereby preventing the fluid flow action. The shaking effect is exhibited.

  In the present embodiment, both the annular portions 22 and 24 fixed to the outer peripheral surface of the outer wall rubbers 40 and 42 and the intermediate fixed portions 34 a and 34 b fixed to the outer peripheral surface of the partition rubber 46 Since it is fixed, the outer peripheral end portions of the outer wall rubbers 40 and 42 and the partition rubber 46 are prevented from being displaced in the axial direction with respect to the outer cylindrical member 14 at the time of axial vibration input. Therefore, in the fluid chambers 68, 70 formed between the outer wall rubbers 40, 42 and the partition rubber 46 in the axial direction, relative pressure fluctuations are effectively induced, and the fluid flow rate of the orifice passage 72 is efficiently made. Since it is ensured, the vibration damping effect based on the fluid flow action can be advantageously obtained.

  Further, in the present embodiment, the reinforcing plate member 18 fixed to the inner shaft member 12 is fixed to the partition rubber 46 of the main rubber elastic body 16, and the deformation rigidity of the inner peripheral portion of the partition rubber 46 is a reinforcing plate Due to the increase by 18, the substantial radial free length of the partition rubber 46 is shortened. Thereby, at the time of axial vibration input, the volume change amount of the upper and lower fluid chambers 68, 70 due to the deformation of the outer wall rubbers 40, 42 and the volume change amount of the upper and lower fluid chambers 68, 70 due to the deformation of the partition rubber 46 The difference is made to be large. Therefore, at the time of axial vibration input, the hydraulic pressure difference between the upper and lower fluid chambers 68, 70 is largely produced, and the fluid flow in the orifice passage 72 based on the hydraulic pressure difference between the upper and lower fluid chambers 68, 70 is efficient. Evoked.

  In the present embodiment, an example in which the partition reinforcing portion is formed of the reinforcing plate member 18 separately formed from the inner shaft member 12 is shown, but the partition reinforcing portion is, for example, an intermediate portion in the axial direction of the inner shaft member 12 It is also possible to provide it integrally as a partial diameter expansion part.

  Here, in the lower mount 10 of the present embodiment, since the orifice passage 72 includes the circumferential groove portions 58 and 59 provided in the upper and lower annular portions 22 and 24 of the intermediate sleeve 20, the orifice passage is formed. The length 72 is secured long without increasing the diameter of the intermediate sleeve 20. As a result, it is possible to set the tuning frequency of the orifice passage 72 to a lower frequency while sufficiently securing the passage sectional area of the orifice passage 72 and effectively obtaining the vibration damping effect based on the fluid flow action. Thus, the degree of freedom in tuning the orifice passage 72 can be obtained.

  In particular, in the present embodiment, since the circumferential groove portions 58 and 59 constituting the orifice passage 72 are respectively formed in the annular portions 22 and 24 on both sides in the axial direction, the passage length of the orifice passage 72 is secured longer. The tuning frequency of the orifice passage 72 can be set with a greater degree of freedom.

  Furthermore, since the orifice passage 72 includes the connection grooves 60, 61, 62, 64 provided on the connection portions 26, 28, the space between the annular portions 22, 24 in the axial direction is effectively utilized. Thus, the passage length of the orifice passage 72 can be made longer.

  The upper and lower circumferential grooves 58, 59 and the connecting grooves 60, 61, 62, 64 constituting the orifice passage 72 are all provided on the integrally vulcanized molded article 36 of the main rubber elastic body 16, and the orifice passage is formed. There is no need to provide an orifice member for forming 72 separately from the integrally vulcanized molded article 36. Therefore, in the axial input type fluid-filled cylindrical anti-vibration device (lower mount 10) provided with the partition rubber 46 separating the upper and lower fluid chambers 68, 70, the upper and lower fluid chambers 68, 70 are mutually The communicating orifice passage 72 can be formed with a small number of parts. The lower mount 10 of this embodiment is constituted by two vulcanized molded articles of the outer cylindrical member 14 provided with the integrally vulcanized molded article 36 of the main rubber elastic body 16 and the seal rubber layer 66, and the process of vulcanization molding As the number is reduced, the number of steps for assembling these vulcanized molded articles is also reduced.

  Although the embodiments of the present invention have been described above in detail, the present invention is not limited by the specific description. For example, although the circumferential groove portions 58 and 59 are formed in the annular portions 22 and 24 on both sides in the axial direction in the above embodiment, the circumferential groove portions may be formed in only one of the annular portions. Specifically, for example, a circumferential groove extending in the circumferential direction is formed with a length of one or less, and both ends of the circumferential groove are connected to each one fluid chamber by a fluid chamber connection groove extending out to the connecting portion. It is good. Furthermore, when circumferential grooves are provided in the annular portions on both sides, each circumferential groove has a length of about a half circumference, and one end of each circumferential groove is connected to a connection groove provided in one of the connection portions. The other end of each circumferential groove can also be connected to one fluid chamber by means of a fluid chamber connection groove provided in the other connection.

  Further, only one connecting portion 26 of the intermediate sleeve 20 may be provided in the circumferential direction, or three or more may be provided. When three or more connecting parts are provided, all of the fluid chamber connecting groove connecting the circumferential groove to the fluid chamber, the connecting groove connecting the circumferential grooves on both axial sides, etc. It does not have to be provided at the connecting part.

  Further, the circumferential groove portions 58 and 59 are not limited to the aspect formed by the circumferential grooves 30 and 32 directly formed on the annular portions 22 and 24 of the intermediate sleeve 20, for example, the outer periphery of the annular portions 22 and 24 It may be formed of a rubber elastic body fixed to a surface, and in this case, it is not necessary to make the annular parts 22 and 24 into a grooved cross section. On the other hand, for example, the connecting portions 60, 61, 62, 64 of the intermediate sleeve 20 are processed by processing the connecting portions 26, 28 of the intermediate sleeve 20 so as to have grooved cross sections corresponding to the connecting grooves 60, 61, 62, 64. It can also be formed directly on the connection parts 26, 28 of

  In the above embodiment, the seal rubber layer 66 separate from the main rubber elastic body 16 is provided on the inner peripheral surface of the outer cylindrical member 14, but the inner peripheral surface of the outer cylindrical member 14 and the intermediate sleeve 20 are illustrated. A seal structure that seals between the outer circumferential surfaces can also be provided on the intermediate sleeve 20 side. Specifically, for example, as in the case of an integrally vulcanized molded article 80 of the main rubber elastic body 16 shown in FIG. 19, circumferential groove portions 58, 59 and connection grooves 60, 61, 62, 64 in the outer peripheral surface of the intermediate sleeve 20. The seal rubber portion 82 may be fixed to a portion out of the formation portion of. The seal rubber portion 82 shown in FIG. 19 is provided with a seal lip 84 projecting to the outer peripheral surface, and the seal performance is improved. Although the seal rubber portion 82 can realize a better sealing performance by being formed separately from the main rubber elastic body 16, it is integrated with the main rubber elastic body 16 as shown in FIG. The formation can also facilitate the manufacture. When the seal rubber portion 82 is provided on the intermediate sleeve 20 side as shown in FIG. 19, the seal rubber layer 66 on the outer cylindrical member 14 side can be omitted, and the number of vulcanized molded articles can be reduced. It is possible to reduce the number of vulcanization molding steps.

10: lower mount (axial input type fluid-filled cylindrical vibration-damping device), 12: inner shaft member, 14: outer cylindrical member, 16: main body rubber elastic body, 18: reinforcing plate member (partition wall reinforcing portion) 20: middle sleeve 22 24: annular part 26, 28: connection part 58, 59: circumferential groove part 34: middle fixed part 40, 42: outer wall rubber 46: partition rubber 60, 61: Connection groove (fluid chamber connection groove), 68: upper fluid chamber (fluid chamber), 70: lower fluid chamber (fluid chamber), 72: orifice passage

Claims (5)

The inner shaft member and the outer cylinder member are connected by the main rubber elastic body, and are provided on both sides in the axial direction so as to generate relative pressure fluctuation at the time of axial vibration input, and the plurality of fluids In an axial input type fluid-filled cylindrical anti-vibration device provided with an orifice passage communicating with a chamber,
The main rubber elastic body is fixed to the inner shaft member and has an outer wall rubber on both axial sides and a partition rubber in an axial intermediate portion, and the fluid chambers are provided on both axial sides of the partition rubber On the other hand, an intermediate sleeve is fixed to the outer peripheral surface of the main rubber elastic body, and in the intermediate sleeve, an annular portion on both axial sides fixed to the outer peripheral surface of each outer wall rubber and the annular portion on both axial directions A circumferential groove extending in the circumferential direction on the outer circumferential surface of the intermediate sleeve is formed on the outer peripheral surface of the intermediate sleeve and extends from the circumferential groove to the circumferential portion on the outer peripheral surface of the intermediate sleeve. And a fluid chamber connection groove portion connecting the plurality of fluid chambers, and the orifice passage is formed by covering the circumferential groove portion and the fluid chamber connection groove portion with the outer cylindrical member. Axial direction characterized by Force type fluid-filled cylindrical vibration damping device.   The fluid input type of axial direction input type according to claim 1, wherein an intermediate fixed portion fixed to the outer peripheral surface of the partition rubber is formed between the axial direction of the annular portions on both axial sides of the intermediate sleeve. Tubular vibration control device.   The fluid-filled cylindrical vibration-damping device of axial direction input type according to claim 1 or 2, wherein the inner shaft member is provided with a partition reinforcing portion fixed to the partition rubber.   The fluid-filled cylindrical vibration-damping device of axial direction input type according to any one of claims 1 to 3, wherein the circumferential groove is formed in the annular portion on both axial sides.   5. An axially input fluid-filled cylindrical anti-vibration device according to any one of claims 1 to 4, wherein said intermediate sleeve is a rotational symmetry of 180 degrees with respect to each of three orthogonal axes including the central axis. .

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