JP2009210062A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control device capable of improving installation performance in a gasket, and capable of preventing generation of an abnormal sound when an outside metal fitting abuts on a vehicle body panel. <P>SOLUTION: A strut mount insulator 1 has a gasket 50 having an annular abutting part 51 set larger in an inner diameter R1 than an outer diameter (an outer diameter of a cylindrical part 31) r2 in a cylindrical part side end part 36A of a corner part 36 of the outside metal fitting 30, bored with an inner peripheral hole 52 set smaller than an inner diameter r1 of an insertion hole 2B of the vehicle body panel 2 and interposed between a flange part 33 of the outside metal fitting 30 and an abutting part 2A of the vehicle body panel 2, and a plurality of projections 53 constituted so as to be elastically deformable and abutting on an outer peripheral surface 36C of the corner part 36 of the outside metal fitting 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is interposed between a piston rod of a shock absorber and a vehicle body panel, and in particular, can improve the assembling property of the gasket, and the outer metal fitting and the vehicle body panel are in contact with each other. The present invention relates to a vibration isolator capable of preventing occurrence of abnormal noise.

  In general, a so-called strut mount insulator is interposed between a piston rod of a shock absorber and a vehicle body panel for the purpose of absorbing vibration propagating from the piston rod side of the shock absorber to the vehicle body panel side.

  Such a conventional strut mount insulator is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-310281. A strut mount insulator is formed of a core member fixed to one end of a piston rod of a shock absorber, an insulator rubber that covers the core member, and a cylindrical member that accommodates the core member and the insulator rubber therein. Cross-sectional shape of the outer peripheral surface including the cylindrical portion inserted through the drilled insertion hole, the flat flange portion fixed to the vehicle body panel, and the flange portion and the cylindrical portion and including the axial center of the cylindrical portion And an outer metal fitting having a corner portion inclined with respect to the axis. Since the insulator rubber absorbs the shock and vibration transmitted from the wheel side, it is prevented that the shock and vibration on the wheel side are directly transmitted to the vehicle body.

Since the vehicle body panel and the outer metal fitting are made of metal, when the vehicle body panel and the outer metal fitting come into direct contact with each other due to an impact propagated from the piston rod, an abnormal noise (metal sound) is generated between the vehicle body panel and the outer metal fitting. To do. In order to prevent the occurrence of this abnormal noise, it is effective to interpose a gasket having an annular contact portion with an inner peripheral hole between the vehicle body panel and the outer bracket of the strut mount insulator. In order to accurately position the gasket with respect to the outer metal fitting, the outer diameter of the cylindrical portion of the outer metal fitting and the inner diameter of the inner peripheral hole of the gasket are matched.
JP 2000-310281 A

  However, if the inner diameter of the inner peripheral hole of the gasket is matched with the outer diameter of the cylindrical portion of the outer metal fitting, when the inner peripheral hole of the gasket is inserted into the cylindrical portion of the outer metal fitting, Since there is no clearance between the cylindrical part of the metal fitting, there was a problem that the assembling property of the gasket deteriorated.

  On the other hand, in order to improve the assembly property of the gasket, it is effective to set the inner diameter of the inner peripheral hole larger than the outer diameter of the cylindrical portion.

  However, if the inner diameter of the inner peripheral hole is set larger than the outer diameter of the cylindrical part, a clearance is generated between the inner peripheral hole and the outer peripheral surface of the cylindrical part, and the gasket is accurately positioned with respect to the outer metal fitting. Can not do it. Therefore, when the inner peripheral hole of the gasket is inserted through the cylindrical part of the outer metal fitting, the corner part is squeezed over the gasket (the state where the end part on the inner peripheral hole side of the abutting part of the gasket rides on the outer peripheral surface of the corner part) Therefore, the mounting position of the gasket with respect to the outer metal fitting is shifted, and a part of the metal surface of the flange portion is exposed from the gasket. As a result, when an impact from the piston rod propagates to the vehicle body side, the vehicle body panel and the outer metal fitting come into direct contact with each other, and an abnormal noise (metal sound) is generated between the vehicle body panel and the flange portion of the outer metal fitting. There was a point.

  The present invention has been made to solve the above-described problems, and can improve the assembly of the gasket and prevent the outer metal fitting and the vehicle body panel from coming into contact with each other to generate abnormal noise. It aims at providing the vibration isolator which can do.

  In order to achieve this object, a vibration isolator according to claim 1 includes a core member fixed to one end of a piston rod of a shock absorber, an insulator rubber covering the core member, the core member and the insulator rubber. A cylindrical portion that is formed by a cylindrical member that is housed therein and is inserted into an insertion hole that is formed in the vehicle body panel, a flat flange portion that is fixed to the vehicle body panel, and the flange portion and the cylindrical shape And an outer metal fitting having a corner portion in which the cross-sectional shape of the outer peripheral surface including the shaft center of the cylindrical portion is inclined with respect to the shaft center, and the body panel and the piston rod of the shock absorber. An inner peripheral hole that is interposed between the inner peripheral hole and is set to be larger than the outer diameter of the cylindrical portion of the outer metal fitting and smaller than the inner diameter of the insertion hole of the vehicle body panel. An annular contact portion provided between the flange portion of the outer metal fitting and the vehicle body panel, and an inner peripheral hole side end edge of the contact portion, and is configured to be elastically deformable. And a gasket having a plurality of protrusions that come into contact with the outer peripheral surface of the corner of the outer metal fitting when the cylindrical portion of the outer metal fitting is inserted into the inner circumferential hole.

  The anti-vibration device according to claim 2 is the anti-vibration device according to claim 1, wherein at least three of the plurality of protrusions are formed in the same shape and are arranged at substantially equal intervals in the circumferential direction of the inner peripheral hole. The inner diameter of the inner peripheral hole is set to be larger than the outer diameter at the flange side end of the corner, and the diameter of the virtual circle that is a virtual circle formed by connecting the tips of the plurality of protrusions is The outer diameter of the corner portion is set to be larger than the outer diameter at the end portion on the cylindrical portion side, and the outer diameter is set to be smaller than the outer diameter of the end portion on the flange portion side of the corner portion.

  The vibration isolator according to claim 3 is the vibration isolator according to claim 2, wherein the protrusion is formed in a mountain shape when viewed from the axial direction of the inner peripheral hole, and the top of the protrusion is the inner peripheral hole. It is formed in a curved shape that is convex toward the axial center side.

  The vibration isolator according to claim 4 is the vibration isolator according to claim 3, wherein the flange portion of the outer metal fitting is an end located on the opposite side of the cylindrical portion with the corner portion interposed therebetween. A flange portion side mounting hole that is drilled on the front end side of the flange portion and through which a shaft portion of a mounting bolt that fixes the flange portion to the vehicle body panel is inserted, and is formed around the flange portion side mounting hole. A seat that is pressed by the head, and extends in a tapered shape so that the width becomes narrower as it approaches the tip, and the cylindrical portion of the outer metal fitting is used as an inner peripheral hole of the gasket. When inserted, the seat portion of the flange portion of the outer metal fitting is arranged at a predetermined interval from the outer edge of the contact portion of the gasket.

  According to the vibration isolator of claim 1, the core material fixed to one end of the piston rod of the shock absorber, the insulator rubber that covers the core material, and the cylindrical material that accommodates the core material and the insulator rubber inside. A cylindrical portion that is formed of a member and is inserted into an insertion hole that is formed in the vehicle body panel, a flat flange portion that is fixed to the vehicle body panel, and the flange portion and the cylindrical portion are connected to each other and the axis of the cylindrical portion is connected. The outer peripheral surface of the outer peripheral surface including the outer metal fitting having a corner portion inclined with respect to the shaft center, and after inserting the tubular portion into the insertion hole formed in the vehicle body panel, the plate-like flange portion is attached to the vehicle body. The vibration and vibration transmitted from the piston rod of the shock absorber are absorbed by fixing the panel to a vibration isolator between the body panel and the piston rod of the shock absorber. It is prevented from being propagated to the panel.

  According to the vibration isolator of the first aspect, the annular contact portion is provided between the flange portion of the outer metal fitting and the vehicle body panel, and the end of the contact portion on the inner peripheral hole side. A gasket having a plurality of protrusions protruding from the edge and configured to be elastically deformable, the contact portion being set larger than the outer diameter of the cylindrical portion of the outer metal fitting and the inner diameter of the insertion hole of the vehicle body panel When an inner peripheral hole having an inner diameter that is set smaller is drilled and the cylindrical part of the outer metal fitting is inserted into the inner peripheral hole, a plurality of protrusions abut on the outer peripheral surface of the corner of the outer metal fitting. As a result, the outer metal fitting and the vehicle body panel can be prevented from coming into contact with each other to prevent abnormal noise from being generated.

  That is, the inner diameter of the inner peripheral hole of the gasket is set to be larger than the outer diameter of the cylindrical part of the outer metal fitting, and elastically deformed by contacting the outer peripheral surface of the corner of the outer metal fitting from the edge of the inner peripheral hole of the gasket. A plurality of protrusions configured to be possible are provided. Therefore, even when the gasket is in contact with the cylindrical portion of the outer metal fitting when the inner peripheral hole of the gasket is inserted into the cylindrical portion of the outer metal fitting, a plurality of protrusions are formed instead of the edge of the inner peripheral hole of the gasket. It contacts the cylindrical part of the outer metal fitting. Even in this case, since the protrusion is elastically deformed along the outer peripheral surface of the cylindrical portion of the outer metal fitting, the inner peripheral hole of the gasket can be easily inserted into the cylindrical portion of the outer metal fitting. Adhesiveness can be improved.

  In addition, since the plurality of protrusions abut on the outer peripheral surface of the corner portion of the outer metal fitting, the movement of the inner peripheral hole in the inner diameter direction is restricted and the gasket is positioned with respect to the outer metal fitting. Therefore, even when the inner peripheral hole is set larger than the outer diameter of the cylindrical portion of the outer metal fitting and smaller than the inner diameter of the insertion hole of the vehicle body panel, a part of the metal surface of the flange portion of the outer metal fitting Can be prevented from being exposed from the contact portion of the gasket.

  Therefore, it is possible to prevent the vehicle body panel and the outer metal fitting from coming into direct contact with each other, and it is possible to prevent an abnormal sound (metal sound) from being generated due to the contact between the vehicle body panel and the outer metal fitting.

  Furthermore, since the protrusion is elastically deformed, the protrusion can be bent along the outer peripheral surface of the corner of the outer metal fitting, and the outer peripheral surface of the corner of the outer metal fitting can be brought into contact with the lower surface of the protrusion. Therefore, since it is possible to prevent a gap from being generated between the gasket contact portion and the outer metal flange portion, the gasket contact portion can be brought into close contact with the outer metal flange portion.

  In addition, even when the protrusion is peeled off at the corner of the outer metal fitting, it is elastically deformed, so that wrinkles are not generated, and the durability of the gasket can be improved.

  According to the vibration isolator of claim 2, in addition to the effect of the vibration isolator of claim 1, the plurality of protrusions are formed in the same shape with at least three or more and substantially in the circumferential direction of the inner peripheral hole. Arranged at equal intervals, the inner diameter of the inner peripheral hole is set to be larger than the outer diameter at the end on the flange portion side of the corner, and the diameter of the virtual circle that is a virtual circle formed by connecting the tips of the plurality of protrusions is Since the outer diameter of the corner portion is set larger than the outer diameter at the end portion on the cylindrical portion side, and the outer diameter is set smaller than the outer diameter at the end portion of the corner portion on the flange portion side, It is possible to accurately position the gasket with respect to the outer metal fitting and to prevent the gasket from wrinkling only by being inserted through the portion.

  That is, since the plurality of protrusions are formed in the same shape and at least three or more and are arranged at substantially equal intervals in the circumferential direction of the inner peripheral hole, the diameter of the inner peripheral hole is larger than that in the case of two or less protrusions. The movement of the gasket in the direction can be restricted, and the gasket can be accurately positioned with respect to the outer metal fitting.

  In addition, the inner diameter of the inner circumferential hole is set to be larger than the outer diameter at the flange side end of the corner, and the diameter of the virtual circle that is a virtual circle formed by connecting the tips of the plurality of protrusions is the corner Is set to be larger than the outer diameter at the end portion on the cylindrical portion side and smaller than the outer diameter at the end portion on the flange portion side of the corner portion, so that the inner peripheral hole of the gasket is inserted into the cylindrical portion of the outer metal fitting. In this case, only the plurality of protrusions can be brought into contact with the outer peripheral surface of the corner portion without causing the edge of the inner peripheral hole side of the contact portion of the gasket to come into contact with the outer peripheral surface of the corner portion. Therefore, the center of the cylindrical part and the center of the inner peripheral hole can be aligned by simply inserting the inner peripheral hole of the gasket into the cylindrical part of the outer metal fitting, so the gasket is accurately positioned with respect to the outer metal fitting. can do.

  In addition, since the edge of the gasket contact part on the inner peripheral hole side does not contact the outer peripheral surface of the corner part, the corner part prevents the end part of the gasket contact part on the inner peripheral hole side. There is an effect that can be done. Therefore, it is possible to prevent wrinkles from occurring on the inner peripheral hole side of the abutting portion of the gasket, it is possible to prevent a decrease in fastening force when fastening the outer metal fitting to the vehicle body panel, and durability of the gasket. There is an effect that can be improved.

  According to the vibration isolator according to claim 3, in addition to the effect of the vibration isolator according to claim 2, the protrusion is formed in a mountain shape when viewed from the axial direction of the inner peripheral hole, and the top of the protrusion is the inner Since it is formed in a curved shape that is convex toward the axial center side of the peripheral hole, there is an effect that the gasket can be accurately positioned with respect to the outer metal fitting.

  That is, the top of the protrusion is formed in a mountain shape when viewed from the axial direction of the inner peripheral hole, and is formed in a curved shape that protrudes toward the axial center of the inner peripheral hole. The length can be set longer. Thereby, it can prevent that the top part of a processus | protrusion bends, and can contact | abut the top part of a processus | protrusion to the outer peripheral surface of an outer metal fitting reliably. Therefore, the gasket can be accurately positioned with respect to the outer metal fitting.

  According to the vibration isolator of claim 4, in addition to the effect of the vibration isolator according to claim 3, the flange portion of the outer metal fitting is an end portion located on the opposite side to the cylindrical portion with the corner portion interposed therebetween. A front end portion, a front end portion of the flange portion, and a flange portion side mounting hole through which a shaft portion of a mounting bolt for fixing the flange portion to the vehicle body panel is inserted, and formed around the flange portion side mounting hole. And a flange that is pressed by the head of the mounting bolt, and the flange portion of the outer metal fitting extends in a tapered shape so that the width becomes narrower as it approaches the tip end side. When the gasket is inserted into the inner peripheral hole of the gasket, the seat part of the flange part of the outer metal fitting is arranged at a predetermined interval from the outer edge of the gasket abutting part. The part is easily bent by the thickness of the gasket. Rukoto can, there is an effect that the flange portion can be firmly fixed to the vehicle body panel.

  In other words, the seat portion of the flange portion of the outer metal fitting is formed around the flange portion side mounting hole, and this flange portion side mounting hole is drilled on the distal end side of the flange portion. It is arranged on the tip side. Since the front end portion of the flange portion is formed in a tapered shape, it is easier to bend than the cylindrical portion side of the flange portion. Further, when the cylindrical portion of the outer metal fitting is inserted into the inner peripheral hole of the gasket, the seat portion of the flange portion of the outer metal fitting is arranged at a predetermined interval from the outer edge of the abutting portion of the gasket. Therefore, by tightening the mounting bolt, the tip of the flange portion can be easily bent toward the vehicle body panel by the head of the mounting bolt, so the gasket generated between the outer edge of the gasket contact portion and the seat portion It is possible to fill the gap corresponding to the thickness of the film relatively easily. Therefore, the flange portion can be firmly fixed to the vehicle body panel.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a strut mount insulator 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the strut mount insulator 1 taken along the line II-II in FIG. In FIG. 2, the vehicle body panel 2 on the vehicle body side, the shock absorber S on the suspension (not shown) side, and the axis O <b> 1 of the piston rod 3 of the shock absorber S are illustrated by two-dot chain lines. With reference to FIG.1 and FIG.2, the whole structure of the strut mount insulator 1 is demonstrated.

  As shown in FIG. 2, the strut mount insulator 1 is a vibration isolator interposed between the vehicle body panel 2 and the piston rod 3 of the shock absorber S, and is attached to the upper end 3A of the piston rod 3 of the shock absorber S. A fixed core member 10, an insulator rubber 20 that covers the core member 10, and an outer metal fitting 30 that accommodates the core member 10 and the insulator rubber 20 therein are provided. The strut mount insulator 1 prevents vibration attenuated by the shock absorber S from propagating to the vehicle body panel 2 via the piston rod 3.

  The vehicle body panel 2 includes an abutting portion 2A with which a flange portion 33 of an outer metal fitting 30 to be described later abuts, an insertion hole 2B formed in a substantially central portion of the abutting portion 2A, and an insertion hole 2B side of the abutting portion 2A. And an upright portion 2C extending in the direction of the axis O1 of the piston rod 3 (vertical direction in FIG. 2). The outer metal fitting 30 together with the inner metal fitting 5 joined to the lower surface of the outer metal fitting 30 is fixed to the vehicle body panel 2 with mounting bolts (not shown).

  Thereby, the strut mount insulator 1 can be interposed between the vehicle body panel 2 and the piston rod 3 of the shock absorber S. The inner diameter of the insertion hole 2B is set to r1, and a seal rubber 40 described later is interposed between the standing portion 2C and the outer metal fitting 30. A through hole 5A is formed in the inner metal fitting 5, and a spring seat 6 is fitted to the inner peripheral side of the through hole 5A.

  The piston rod 3 is an operating shaft of a shock absorber S that is a device that absorbs shock and vibration on the wheel side, and a core member 10 is attached to the upper end 3A. A cap 4 is attached (screwed) to the upper end 3 </ b> A of the piston rod 3, and the cap 4 prevents the core material 10 from coming off from the upper end 3 </ b> A of the piston rod 3.

  The core member 10 is interposed between the piston rod 3 and the insulator rubber 20, and has a fastening hole 12 through which the upper end 3 </ b> A of the piston rod 3 is inserted and is vertically moved (vertical direction in FIG. 2). A cylindrical tube portion 11 penetrating through and an annular collar portion 13 covered with the insulator rubber 20 is formed, and is formed in a T shape in a cross section including the axis O1 of the piston rod 3. With this core material 10, an insulator rubber 20 can be interposed between the piston rod 3 and the outer metal fitting 30.

  The insulator rubber 20 is an annular rubber member that absorbs shocks and vibrations propagated from the piston rod 3, and includes an inner peripheral surface 36 </ b> D of a cylindrical portion 31 of the outer metal fitting 30 and an upper surface of the inner metal fitting 5, which will be described later. It is in contact with.

  Since the thinned portion 21 is provided on the outer peripheral surface of the insulator rubber 20 disposed in the longitudinal direction (left and right direction in FIG. 1) of the outer metal fitting 30, the rigidity (spring constant) of the insulator rubber 20 is the outer metal fitting 30. It is set smaller in the longitudinal direction of the outer metal fitting 30 than the short direction (vertical direction in FIG. 1) of the outer metal fitting 30 perpendicular to the longitudinal direction (left and right direction in FIG. 1). Thereby, the insulator rubber 20 is easily elastically deformed in the longitudinal direction of the outer metal fitting 30, and the riding comfort of the vehicle body is improved.

  As shown in FIGS. 1 and 2, the outer metal fitting 30 is formed in a rhombus shape in plan view, and has a substantially hat shape in which a central portion projects upward (upward in FIG. 2) in a cross section including the axis O <b> 1 of the piston rod 3. And is connected to the shock absorber S via the piston rod 3. The length of the outer metal fitting 30 in the longitudinal direction (left and right direction in FIG. 1) is set to L1, and the length in the short direction (vertical direction in FIG. 1) perpendicular to the longitudinal direction of the outer metal fitting 30 is set to L2 shorter than L1. ing.

  Further, the outer metal fitting 30 is inserted from the lower side (the lower side in FIG. 2) into an insertion hole 2 </ b> B that is formed of a cylindrical member that accommodates the core material 10 and the insulator rubber 20 therein and is formed in the vehicle body panel 2. A cross-sectional shape that includes the cylindrical portion 31, a flat flange portion 33 that is fixed to the abutting portion 2 </ b> A of the vehicle body panel 2, and the flange portion 33 and the cylindrical portion 31, and includes the axial center O <b> 2 of the cylindrical portion 31. Is provided with a corner portion 36 inclined with respect to the axis O2. The axial center O2 of the cylindrical portion 31 is set to coincide with the axial center O1 of the piston rod 3.

  As shown in FIG. 2, the cylindrical portion 31 extends in the vertical direction (the vertical direction in FIG. 1) and closes the upper end side of the cylindrical portion 31 with an annular upper portion 32. The upper portion 32 is provided with a rod insertion hole 32A, and the upper end 3A of the piston rod 3 is protruded above the upper portion 32 of the outer metal fitting 30 (upper side in FIG. 2).

  Further, the outer diameter of the cylindrical portion 31 is set larger on the lower end side than the upper end side (upper side in FIG. 2), and the outer diameter on the lower end side (corner portion 36 side, lower side in FIG. 2) of the cylindrical portion 31 is The outer diameter r2 at the cylindrical portion side end portion 36A of the corner portion 36 is set to be smaller than the inner diameter r1 of the insertion hole 2B. Therefore, the cylindrical part 31 can be easily inserted through the insertion hole 2B.

  As shown in FIGS. 1 and 2, the flange portion 33 is formed of a flat plate-like member, and is disposed below the contact portion 2 </ b> A of the vehicle body panel 2 when the outer metal fitting 30 is attached to the vehicle body panel 2. Is done. Further, the flange portion 33 is located on the opposite side of the cylindrical portion 31 with the corner portion 36 interposed therebetween, and the width thereof becomes narrower as it approaches the distal end side (the right side and the left side in FIG. 1) around the cylindrical portion 31. The flange portion 33 is fixed to the vehicle body panel 2 and a shaft portion (not shown) of a mounting bolt is inserted on the tip portion 33A side of the flange portion 33. A pair of flange portion side mounting holes 34 is formed, and a seat portion 35 that is pressed around the flange portion side mounting hole 34 by a head (not shown) of a mounting bolt is provided. An axis O2 of the cylindrical portion 31 is disposed on a line including the center of the pair of flange portion side mounting holes 34 (see FIG. 1).

  As shown in FIG. 2, the corner portion 36 is connected to the cylindrical portion side end portion 36 </ b> A that is a connection portion with the lower end of the cylindrical portion 31 and the inner end (end portion of the cylindrical portion 31) of the flange portion 33. The inner peripheral surface 36D and the outer peripheral surface 36C provided between the cylindrical portion side end portion 36A and the flange portion side end portion 36B are configured to include a cylindrical portion. The cross-sectional shape including 31 axial centers O2 is formed in an inclined shape, specifically, an arc shape.

  The outer diameter r <b> 2 at the cylindrical portion side end 36 </ b> A of the corner portion 36 is set to be the same as the outer diameter at the lower end of the cylindrical portion 31. Further, the outer diameter r3 at the flange portion side end portion 36B of the corner portion 36 is set smaller than the inner diameter r1 of the insertion hole 2B, and the outer diameter at the lower end of the cylindrical portion 31 (the cylindrical portion side end of the corner portion 36). The outer diameter r2) of the portion 36A is set larger.

  Next, the seal rubber 40 will be described with reference to FIGS. 3 and 4. 3 is a front view of the seal rubber 40, and FIG. 4 is a cross-sectional view of the seal rubber 40 taken along line IV-IV in FIG.

  As shown in FIGS. 3 and 4, the seal rubber 40 is an annular ring member formed of an elastic member (rubber-like elastic body) and coincides with the axis O1 (see FIG. 2) of the piston rod 3. A cylindrical portion 41 that extends in a cylindrical shape in the axial center O3 direction (the vertical direction in FIG. 4) of the seal rubber 40, an inner peripheral surface 41A is provided on the inner peripheral side, and an outer peripheral surface 41B is provided on the outer peripheral side; 41, an opening hole 42 provided on the inner peripheral surface 41A side, an annular inner protrusion 43 projecting inwardly from the inner peripheral surface 41A of the cylindrical portion 41 (on the axis O3 side of the seal rubber 40), and the cylindrical portion 41 An annular first outer projection 44 projecting outward from the outer peripheral surface 41B obliquely upward, and positioned below the outer first projection 44 (downward in FIG. 4) from the outer peripheral surface 41B of the cylindrical portion 41 in a substantially horizontal direction. An outer second protrusion 45 protruding outward from the outer first protrusion 44; It is configured Te.

  The inner projection 43 is brought into contact with the outer surface 31C (see FIG. 2) of the cylindrical portion 31 of the outer metal fitting 30, and the tip of the outer second projection 45 is brought into contact with the standing portion 2C (see FIG. 2) of the vehicle body panel 2. At the same time, the lower surface of the outer second protrusion 45 that protrudes downward is brought into contact with the flange portion 33 (see FIG. 2) of the outer metal fitting 30 so that the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2). The water tightness between the two is ensured.

  Further, due to the inner protrusion 43, the inner peripheral surface 41A of the seal rubber 40 is in line contact with the outer peripheral surface 31C (see FIG. 2) of the cylindrical portion 31 at two locations on the outer peripheral surface 31C (see FIG. 2) of the cylindrical portion 31. Therefore, the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2) are compared to the case where the inner circumferential surface 41A of the seal rubber 40 and the outer circumferential surface 31C (see FIG. 2) of the cylindrical portion 31 are in surface contact. ) Can be improved.

  Further, since the outer first protrusion 44 and the outer second protrusion 45 are projected outwardly from the outer peripheral surface 41B of the cylindrical portion 41 with a predetermined interval, the outer first protrusion 44 and the outer second protrusion 45 are compressed. The deformed portion can be moved when deformed, and the outer first protrusion 44 and the outer second protrusion 45 can be brought into close contact with the standing portion 2C (see FIG. 2) of the vehicle body panel 2 to ensure water tightness. be able to.

  Next, the gasket 50 will be described with reference to FIG. FIG. 5 is a front view of the gasket 50. As shown in FIG. 5, the gasket 50 is interposed between the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2), and the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 5). 2) to prevent abnormal noise (metal sound) due to direct contact with the flange portion 33 (see FIG. 2) of the outer metal fitting 30 and the vehicle body panel 2. A contact portion 51 interposed between the contact portion 2A (see FIG. 2) and a plurality of protrusions 53 configured to be elastically deformable and in contact with the outer peripheral surface 36C of the corner portion 36 of the outer metal fitting 30. Configured.

  When the cylindrical portion 31 of the outer metal fitting 30 is inserted into the inner peripheral hole 52 of the gasket 50, the plurality of protrusions 53 abut on the outer peripheral surface 36 </ b> C of the corner portion 36 of the outer metal fitting 30. In addition to the improvement, it is possible to prevent the outer metal fitting 30 and the vehicle body panel 2 from coming into contact with each other and generating abnormal noise.

  The contact portion 51 is formed in an annular shape by drilling an inner peripheral hole 52 having an inner diameter R1, and includes an inner edge 51A that is an inner peripheral hole 52 side (inner peripheral side) edge and an outer peripheral end edge. It has an outer edge 51B. The inner diameter R1 of the inner peripheral hole 52 is set to be larger than the outer diameter r2 (see FIG. 2) at the cylindrical portion side end 36A of the corner portion 36 of the outer metal fitting 30, and the inner diameter of the insertion hole 2B of the vehicle body panel 2 It is set smaller than r1 (see FIG. 2). The outer diameter R2 of the outer edge 51B of the contact portion 51 is set to be smaller than L2 (see FIG. 1) which is the length of the outer metal fitting 30 in the short direction (vertical direction in FIG. 1).

  As described above, the inner diameter R1 of the inner peripheral hole 52 of the gasket 50 is set larger than the outer diameter r2 at the cylindrical portion side end portion 36A of the corner portion 36 which is the maximum outer diameter of the cylindrical portion 31 of the outer metal fitting 30. A plurality of protrusions 53 that protrude from the inner edge 51A of the inner peripheral hole 52 of the gasket 50 to the outer peripheral surface 36C of the corner portion 36 of the outer metal fitting 30 and are elastically deformable are provided. Therefore, even when the gasket 50 comes into contact with the cylindrical portion 31 of the outer metal fitting 30 when the inner peripheral hole 52 of the gasket 50 is inserted into the cylindrical portion 31 of the outer metal fitting 30, A plurality of protrusions 53 abut on the cylindrical portion 31 of the outer metal fitting 30 instead of the inner edge 51A. Even in this case, since the protrusion 53 is elastically deformed along the outer peripheral surface 31C of the cylindrical portion 31 of the outer metal fitting 30, the inner peripheral hole 52 of the gasket 50 is simply inserted into the cylindrical portion 31 of the outer metal fitting 30. Thus, the assembling property of the gasket 50 can be improved.

  Therefore, it is possible to prevent the vehicle body panel 2 and the outer metal fitting 30 from directly contacting each other, and it is possible to prevent the body panel 2 and the outer metal fitting 30 from contacting each other to generate an abnormal sound (metal sound). .

  In addition, since the plurality of protrusions 53 abut on the outer peripheral surface 36 </ b> C of the corner 36 of the outer metal fitting 30, the movement of the inner peripheral hole 52 in the inner diameter direction is restricted and the gasket 50 is positioned with respect to the outer metal fitting 30. . Therefore, the inner peripheral hole 52 is set larger than the outer diameter of the cylindrical portion 31 of the outer metal fitting 30 (the outer diameter r2 at the cylindrical portion side end portion 36A of the corner portion 36) and the inner diameter of the insertion hole 2B of the vehicle body panel 2 Even if it is set to be smaller than r1, a part of the metal surface of the flange portion 33 of the outer metal fitting 30 can be prevented from being exposed from the contact portion 51 of the gasket 50.

  Further, since the protrusion 53 is elastically deformed, it can be bent along the outer peripheral surface 36C (see FIG. 2) of the corner portion 36 of the outer metal fitting 30. Therefore, it is possible to prevent a gap from being generated between the contact portion 51 of the gasket 50 and the flange portion 33 of the outer metal fitting 30, and the contact portion 51 of the gasket 50 is replaced with the flange portion 33 of the outer metal fitting 30 (see FIG. 2). In addition, even when the protrusion 53 is separated from the corner portion 36 (see FIG. 2) of the outer metal fitting 30, it is possible to prevent the protrusion 53 from being wrinkled. The durability of can be improved.

  Further, since the gasket 50 can be positioned with respect to the outer metal fitting 30 (see FIG. 2), a part of the metal surface of the flange portion 33 (see FIG. 2) of the outer metal fitting 30 is separated from the contact portion 51 of the gasket 50. Exposure can be prevented. Accordingly, it is possible to prevent the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2) from coming into direct contact with each other, and the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2) It is possible to prevent abnormal noise (metal sound) from being generated due to contact.

  The protrusion 53 protrudes from the inner edge 51A of the contact portion 51 with a length L3 and is formed in a mountain shape when viewed from the direction of the axis O4 of the inner peripheral hole 52. The top 53A of the protrusion 53 is the axis of the inner peripheral hole 52. It is formed in a curved shape that is convex toward the center O4 side. Further, at least three or more protrusions 53 (four in the first embodiment) are formed, and are arranged at substantially equal intervals in the circumferential direction of the inner peripheral hole 52. That is, the four protrusions 53 are arranged so that the lines connecting the pair of protrusions 53 are orthogonal to each other.

  The diameter of the virtual circle 55, which is a virtual circle formed by connecting the tips of the protrusions 53 (tips of the top portion 53A), is the outer diameter of the cylindrical portion side end portion 36A of the corner portion 36 of the outer metal fitting 30. It is set to be larger than r2 (see FIG. 2) and smaller than the outer diameter r3 (see FIG. 2) at the flange side end 36B of the corner 36 of the outer metal fitting 30.

  The plurality of protrusions 53 are thus formed in the same shape and at least three or more are arranged at substantially equal intervals in the circumferential direction of the inner peripheral hole 52, and the inner diameter R <b> 1 of the inner peripheral hole 52 is a flange portion of the corner portion 36. A diameter R3 of a virtual circle 55 which is set larger than the outer diameter r3 (see FIG. 2) at the side end portion 36B and is formed by connecting the tips of the plurality of protrusions 53 is a cylindrical portion of the corner portion 36. Since the outer diameter r2 (see FIG. 2) at the side end 36A is set larger than the outer diameter r3 (see FIG. 2) at the flange side end 36B of the corner 36, the gasket 50 The gasket 50 can be accurately positioned with respect to the outer metal fitting 30 (see FIG. 2) simply by inserting the inner peripheral hole 52 into the cylindrical portion 31 (see FIG. 2) of the outer metal fitting 30, and the assembling property is improved. Can be improved, It is possible to prevent the wrinkles in the gasket 50.

  More specifically, since the plurality of protrusions 53 are formed in at least three or more with the same shape and are arranged at substantially equal intervals in the circumferential direction of the inner peripheral hole 52, the movement of the gasket 50 in the radial direction of the inner peripheral hole 52. The gasket 50 can be positioned with respect to the outer metal fitting 30 (see FIG. 2).

  In addition, the inner diameter R1 of the inner peripheral hole 52 is set to be larger than the outer diameter r3 (see FIG. 2) at the flange portion side end portion 36B of the corner portion 36, and is formed by connecting the tips of the plurality of protrusions 53. The diameter R3 of the virtual circle 55, which is a circle, is set to be larger than the outer diameter r2 (see FIG. 2) at the cylindrical portion side end portion 36A of the corner portion 36, and the outer diameter at the flange portion side end portion 36B of the corner portion 36. It is set smaller than the diameter r3 (see FIG. 2).

  Therefore, when the inner peripheral hole 52 of the gasket 50 is inserted into the cylindrical portion 31 (see FIG. 2) of the outer metal fitting 30, the protrusion 53 of the gasket 50 becomes the outer peripheral surface 36C of the corner 36 of the outer metal fitting 30 (see FIG. 2). Therefore, the inner edge 51A of the contact portion 51 of the gasket 50 does not contact the outer peripheral surface 31C of the cylindrical portion 31 and the outer peripheral surface 36C of the corner portion 36 (see FIG. 2). The protrusion 53 can be brought into contact with the outer peripheral surface 36 </ b> C (see FIG. 2) of the corner portion 36.

  Therefore, the center of the cylindrical portion 31 (see FIG. 2) of the outer metal fitting 30 and the inner circumference of the gasket 50 can be obtained simply by inserting the inner peripheral hole 52 of the gasket 50 into the cylindrical portion 31 (see FIG. 2) of the outer metal fitting 30. Since the center of the hole 52 can be made coincident, the gasket 50 can be accurately positioned with respect to the outer metal fitting 30 (see FIG. 2).

  Further, since the inner edge 51A of the contact portion 51 of the gasket 50 is not brought into contact with the outer peripheral surface 36C (see FIG. 2) of the corner portion 36 of the outer metal fitting 30, the corner portion 36 (see FIG. 2) of the outer metal fitting 30 is not. It is possible to prevent the inner edge 51A of the contact portion 51 of the gasket 50 from striking.

  Therefore, wrinkles can be prevented from occurring at the inner edge 51A of the contact portion 51 of the gasket 50, and the fastening force is reduced when the outer metal fitting 30 (see FIG. 2) is fastened to the vehicle body panel 2 (see FIG. 2). Can be prevented, and the durability of the gasket 50 can be improved.

  The protrusion 53 is formed in a mountain shape when viewed from the direction of the axis O4 of the inner peripheral hole 52, and the top 53A of the protrusion 53 is formed in a curved shape that protrudes toward the axis of the inner peripheral hole 52. The gasket 50 can be accurately positioned with respect to 30 (see FIG. 2).

  That is, the top portion of the protrusion 53 is formed in a mountain shape when viewed from the axial direction of the inner peripheral hole 52 and is formed in a curved shape that protrudes toward the axial center side of the inner peripheral hole 52. The length in the circumferential direction can be set long.

  Accordingly, the top 53A of the protrusion 53 can be prevented from being bent, and the top 53A of the protrusion 53 can be reliably brought into contact with the outer peripheral surface 36C (see FIG. 2) of the corner portion 36 of the outer metal fitting 30. Therefore, the gasket 50 can be accurately positioned with respect to the outer metal fitting 30 (see FIG. 2).

  Further, when the inner peripheral hole 52 (see FIG. 2) of the gasket 50 is inserted through the cylindrical portion 31 (see FIG. 2) of the outer metal fitting 30, that is, when the gasket 50 is attached to the outer metal fitting 30 (see FIG. 2). Further, a seat portion 35 (see FIG. 2) of the flange portion 33 of the outer metal fitting 30 is disposed at a predetermined interval from the outer edge 51B of the contact portion 51 of the gasket 50.

  Moreover, the flange part 33 (refer FIG. 2) of the outer metal fitting 30 is extended in the taper shape so that a width | variety may become narrow as it approaches the front-end | tip part 33A (refer FIG. 2) side. Therefore, by fastening a mounting bolt (not shown), the seat portion 35 (see FIG. 2) can be easily bent by the thickness of the gasket, and the flange portion 33 (see FIG. 2) is attached to the vehicle body panel 2 (see FIG. 2). (See FIG. 2).

  That is, since the tip end portion of the flange portion 33 (see FIG. 2) is formed in a tapered shape, it is easier to bend than the cylindrical portion 31 (see FIG. 2) side of the flange portion 33. Therefore, by fastening a mounting bolt (not shown), the tip of the flange portion 33 (see FIG. 2) can be easily moved to the vehicle body panel 2 (see FIG. 2) side by the head (not shown) of the mounting bolt. Since it can be bent, a gap corresponding to the thickness of the gasket 50 generated between the outer edge 51B of the contact portion 51 of the gasket 50 and the seat portion 35 (see FIG. 2) of the outer metal fitting 30 can be filled relatively easily. it can. Accordingly, the flange portion 33 (see FIG. 2) of the outer metal fitting 30 can be firmly fixed to the vehicle body panel 2.

  Next, with reference to FIGS. 6 to 8, the mounting process of the gasket 50 will be described. 6 to 8 are enlarged cross-sectional views of the strut mount insulator 1 taken along a cross-sectional line including the axial center O2 of the cylindrical portion 31 of the outer metal fitting 30, and FIG. 7 shows a state in which the inner peripheral hole 52 is inserted, FIG. 7 shows a state in which the opening hole 42 of the seal rubber 40 is inserted into the cylindrical portion 31 of the outer metal fitting 30, and FIG. A state in which 30 cylindrical portions 31 are inserted through the insertion holes 2B of the vehicle body panel 2 is shown.

  First, as shown in FIG. 6, the inner peripheral hole 52 (see FIG. 5) of the gasket 50 is inserted through the cylindrical portion 31 of the outer metal fitting 30. The diameter R3 (see FIG. 5) of the virtual circle 55, which is a virtual circle formed by connecting the tips of the protrusions 53 of the gasket 50 (tips of the top 53A), is the cylindrical side end of the corner 36 of the outer metal fitting 30. Since the outer diameter r2 (see FIG. 2) in the portion 36A is set larger than the outer diameter r3 (see FIG. 2) in the flange side end portion 36B of the corner portion 36 of the outer metal fitting 30, the gasket The top 53 </ b> A of the 50 protrusions 53 abuts on the outer peripheral surface 36 </ b> C of the corner 36 of the outer metal fitting 30.

  In this case, the inner edge 51A of the contact portion 51 is disposed on the outer peripheral side (right side in FIG. 6) of the flange portion side end portion 36B of the corner portion 36 of the outer metal fitting 30. Thereafter, the protrusion 53 is elastically deformed and bends along the outer peripheral surface 36C of the corner portion 36, whereby the inner edge 51A of the contact portion 51 is outside the flange portion side end portion 36B of the corner portion 36 of the outer metal fitting 30. It contacts the flange portion 33 of the outer metal fitting 30.

  Thus, the inner diameter R1 (see FIG. 5) of the inner peripheral hole 52 of the contact portion 51 is set larger than the outer diameter (see FIG. 2) at the cylindrical portion side end portion 36A of the corner portion 36 of the outer metal fitting 30. Therefore, the inner peripheral hole 52 of the gasket 50 can be easily inserted into the cylindrical portion 31 of the outer metal fitting 30.

  In addition, since the top 53A of the protrusion 53 of the gasket 50 abuts on the outer peripheral surface 36C of the corner 36 of the outer metal fitting 30, the gasket 50 can be positioned with respect to 30.

  Therefore, it is possible to prevent the contact portion 51 of the gasket 50 from protruding from the flange portion 33 of the outer metal fitting 30 in the short direction of the flange portion 33 (the left-right direction in FIG. 1). Thereby, it is possible to prevent a part of the metal surface of the flange portion 33 (see FIG. 2) of the outer metal fitting 30 from being exposed from the contact portion 51 of the gasket 50. Accordingly, it is possible to prevent the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2) from coming into direct contact with each other, and the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30 (see FIG. 2) It is possible to prevent abnormal noise (metal sound) from being generated due to contact.

  Further, since the contact portion 51 of the gasket 50 does not protrude from the flange portion 33 of the outer metal fitting 30 in the short direction (left and right direction in FIG. 1) of the flange portion 33, when attaching to the vehicle body 2 (see FIG. 2), etc. It is possible to prevent the contact portion 51 of the gasket 50 from being bent and becoming a defective product.

  Furthermore, since the inner edge 51A of the contact portion 51 contacts the flange portion 33 of the outer metal fitting 30 on the outer side (right side in FIG. 6) of the corner portion 36 of the outer metal fitting 30 on the outer side (right side in FIG. 6). It is possible to prevent 36 from striking the inner edge 51 </ b> A side of the contact portion 51 of the gasket 50. Thereby, wrinkles can be prevented from occurring on the inner edge 51 </ b> A side of the contact portion 51 of the gasket 50.

  Therefore, it is possible to prevent a decrease in fastening force when fastening the outer metal fitting 30 to the vehicle body panel 2 (see FIG. 2) with a mounting bolt (not shown), and to improve the durability of the gasket 50. .

  Further, since the protrusion 53 is elastically deformed, it can be bent along the outer peripheral surface 36 </ b> C of the corner portion 36 of the outer metal fitting 30. Therefore, since the contact part 51 of the gasket 50 can be prevented from floating, the contact part 51 of the gasket 50 can be brought into close contact with the flange part 33 of the outer metal fitting 30. In addition, since the protrusion 53 comes into contact with the outer peripheral surface 36C of the corner portion 36 of the outer metal fitting 30, the protrusion 53 can be prevented from wrinkling even in this case. Durability can be improved.

  Next, as shown in FIG. 7, when the projection 53 is bent along the outer peripheral surface 36 </ b> C of the corner portion 36, the lower surface of the projection 53 and the outer peripheral surface 36 </ b> C of the corner portion 36 come into contact with each other. It is attached. Thereafter, when the opening hole 42 of the seal rubber 40 is inserted into the cylindrical portion 31 of the outer metal fitting 30, the annular inner protrusion 43 of the seal rubber 40 and the outer peripheral surface of the cylindrical portion 31 of the outer metal fitting 30 come into contact with each other. The lower surface of the outer second protrusion 45 of the seal rubber 40 and the contact portion 51 of the gasket 50 abut.

  The tip of the top portion 53A of the projection 53 is disposed between the cylindrical portion side end portion 36A and the flange portion side end portion 36B on the outer peripheral surface 36C of the corner portion 36. That is, the protrusion amount L3 of the protrusion 53 is set so that the protrusion 53 contacts the outer peripheral surface 36C of the corner portion 36 and does not contact the outer peripheral surface 31C of the cylindrical portion 31.

  For example, when the inner diameter R1 of the inner peripheral hole 52 of the contact portion 51 is set larger than the outer diameter r2 (see FIG. 2) of the cylindrical portion side end portion 36A on the outer peripheral surface 36C of the corner portion 36, the contact portion 51. Compared with the case where the inner diameter R1 (see FIG. 5) of the inner peripheral hole 52 is the same as the outer diameter r2 (see FIG. 2) of the cylindrical portion side end portion 36A of the outer peripheral surface 36C of the corner portion 36, the protrusion 53 protrudes. The installation amount L3 is set large.

  That is, when the inner diameter R1 of the inner peripheral hole 52 of the contact portion 51 is set larger than the outer diameter r2 (see FIG. 2) of the cylindrical portion side end portion 36A of the outer peripheral surface 36C of the corner portion 36, the inner edge of the gasket 50 is set. 51A approaches the upright portion 2C (see FIG. 2) side of the vehicle body panel 2 (away from the corner portion 36), so that the protrusion amount L3 of the protrusion 53 is brought into contact with the outer peripheral surface 36C of the corner portion 36. Must be set larger.

  Therefore, since the protrusion amount L3 of the protrusion 53 is set so that the protrusion 53 does not contact the outer peripheral surface 31C of the cylindrical portion 31, the protrusion 53 and the outer peripheral surface 31C of the cylindrical portion 31 of the outer metal fitting are sealed rubber. It is possible to prevent the contact with the 40 annular inner protrusions 43 from being hindered.

  The width of the protrusion 53 in the circumferential direction is set so that the protrusion 53 can be elastically deformed. That is, the circumferential width of the protrusion 53 is set to be larger than the protrusion amount L3 of the protrusion 53, but is set to be smaller than twice the protrusion amount L3 of the protrusion 53. In addition, a gap is set between adjacent protrusions 53, and the width in the circumferential direction of the gap is set larger than the width in the circumferential direction of the protrusion 53. Therefore, when the inner peripheral hole 52 of the gasket 50 is inserted through the cylindrical portion 31 of the outer metal fitting 30, even if the protrusion 53 comes into contact with the outer peripheral surface 31C of the cylindrical portion 31 of the outer metal fitting 30, the protrusion 53 is elastically deformed. Therefore, the inner peripheral hole 52 of the gasket 50 can be easily inserted into the cylindrical portion 31 of the outer metal fitting 30, and the assemblability is improved.

  If the gap set between the adjacent protrusions 53 is set to be narrower than the width of the protrusion 53, even if the protrusion 53 comes into contact with the outer peripheral surface 31C of the cylindrical portion 31 of the outer metal fitting 30, the protrusion 53 Without being elastically deformed, the inner peripheral hole 52 of the gasket 50 cannot be easily inserted into the cylindrical portion 31 of the outer metal fitting 30, and the assemblability deteriorates.

  Further, the lower surface of the outer second protrusion 45 of the seal rubber 40 and the contact portion 51 of the gasket 50 are in contact with the outer peripheral side (right side in FIG. 6) of the inner edge 51A of the contact portion 51 of the gasket 50. 53 is not in contact with the lower surface of the seal rubber 40.

  Therefore, the outer peripheral side (right side in FIG. 6) of the inner edge 51A of the abutting portion 51 of the gasket 50, that is, the gasket 50 abuts against the seal rubber 40 at the abutting portion 51 and presses the abutting portion 51. The contact area between the gasket 50 and the seal rubber 40 can be ensured.

  Therefore, even after the gasket 50 is attached to the outer metal fitting 30, when the seal rubber 40 is attached to the outer metal fitting 30, the seal rubber 40 presses the contact portion 51 of the gasket 50 from the upper side (the upper side in FIG. 6). Since the movement of 50 can be regulated, the displacement of the gasket 50 with respect to the outer metal fitting 30 can be prevented.

  Further, since the gasket 50 is shipped in a state of being attached to the outer metal fitting 30, that is, in a state of being interposed between the outer metal fitting 30 and the seal rubber 40, the gasket 50 is attached to the outer metal fitting 30 by the seal rubber 40. The position shift of the gasket 50 can be prevented. Therefore, even when the outer metal fitting 30 is transported with the gasket 50 attached, the gasket 50 does not protrude from the flange portion 33 of the outer metal fitting 30 during the transportation or the like, and the gasket 50 is bent. Can be prevented.

  In a state where the gasket 50 is attached to the outer metal fitting 30, a seal rubber 40 is interposed between the inner edge 51 A side portion of the contact portion 51 of the gasket 50 and the contact portion 2 A of the vehicle body panel 2. Therefore, the inner edge 51A side portion of the contact portion 51 and the contact portion 2A of the vehicle body panel 2 are not in direct contact. Therefore, even when the protrusion 53 is projected from the inner edge 51A of the contact portion 51, the noise (metal) generated between the function of the gasket 50 (the vehicle body panel 2 (see FIG. 2) and the outer metal fitting 30). Sound) is not obstructed.

  Finally, as shown in FIG. 9, the cylindrical portion 31 of the outer metal fitting 30 is inserted into the insertion hole 2 </ b> B of the vehicle body panel 2, and the lower surface of the contact portion 2 </ b> A of the vehicle body panel 2 and the upper surface of the contact portion 51 of the gasket 50. And a shaft portion (not shown) of a mounting bolt is inserted into the flange portion side mounting hole 34 (see FIG. 1) of the outer metal fitting 30 and the seat portion 35 is brought into contact with the flange portion 33 so that the outer metal fitting is inserted. 30 is attached to the vehicle body panel 2.

  As described above, when the outer metal fitting 30 is attached to the vehicle body panel 2, the insertion hole 2B side of the standing portion 2C of the vehicle body panel 2 and the distal end portion of the outer second protrusion 45 of the seal rubber 40 come into contact with each other. Since the 40 annular inner protrusions 43 and the outer peripheral surface of the cylindrical portion 31 of the outer metal fitting 30 come into contact with each other, watertightness between the vehicle body panel 2 and the outer metal fitting 30 is ensured.

  Further, the protrusion 53 of the gasket 50 is not in contact with the lower surface of the seal rubber 40, and a gap is set between the upper surface of the protrusion 53 of the gasket 50 and the lower surface of the cylindrical portion 41 of the seal rubber 40. . Since the seal rubber 40 can be elastically deformed using this gap, the watertightness between the vehicle body panel 2 and the outer metal fitting 30 can be improved.

  Note that at least one of the upper inner protrusion 43 and the lower inner protrusion 43 is in contact with the outer peripheral surface of the cylindrical portion 31 of the outer metal fitting 30 with the outer metal fitting 30 attached to the vehicle body panel 2. It is sufficient that at least one of the outer first protrusion 44 and the outer second protrusion 45 is in contact with the insertion hole 2B side of the standing portion 2C of the vehicle body panel 2. Thereby, the watertightness between the vehicle body panel 2 and the outer metal fitting 30 is ensured.

  Further, when the gasket 50 is attached to the outer metal fitting 30, the seat portion 35 (see FIG. 2) of the flange portion 33 of the outer metal fitting 30 is disposed at a predetermined interval from the outer edge 51B of the contact portion 51 of the gasket 50. ing.

  Therefore, since the gasket 50 is not disposed around the seat portion 35 (see FIG. 2) of the flange portion 33 of the outer metal fitting 30, the outer metal fitting 30 is attached to the vehicle body panel 2 (see FIG. 2) by a mounting bolt (not shown). A decrease in fastening force when fastening can be prevented.

  In addition, the seat portion 35 of the flange portion 33 is disposed on the distal end portion 33A side of the flange portion 33. Since the distal end portion of the flange portion 33 is formed in a tapered shape, the tubular portion 31 side of the flange portion 33 is formed. It is easier to bend than. Therefore, by fastening the mounting bolt (not shown), the tip end portion of the flange portion 33 can be easily bent toward the vehicle body panel 2 by the head (not shown) of the mounting bolt. A gap corresponding to the thickness of the gasket 50 generated between the outer edge 51B of the contact portion 51 and the seat portion 35 can be filled relatively easily. Therefore, the flange portion 33 can be firmly fixed to the vehicle body panel 2.

  Next, the gasket 150 in 2nd embodiment is demonstrated with reference to FIG. FIG. 9 is a front view of the gasket 150 in the second embodiment. The rest of the configuration excluding the gasket 150 is the same as in the first embodiment. In addition, the same code | symbol is attached | subjected to the part same as above-described 1st embodiment, and the description is abbreviate | omitted.

  The gasket 50 in the first embodiment has four protrusions 53 protruding from the inner edge 51A on the inner peripheral hole 52 side of the contact portion 51 of the gasket 50, whereas the gasket 150 in the second embodiment is As shown in FIG. 9, three protrusions 153 protrude from the inner edge 151 </ b> A on the inner peripheral hole 152 side of the contact portion 151 of the gasket 150.

  Therefore, in the second embodiment, the number of protrusions 153 can be set smaller than in the first embodiment.

  As described above, the present invention has been described based on each embodiment, but the present invention is not limited to each embodiment described above, and various improvements and modifications can be made without departing from the spirit of the present invention. Something can be easily guessed.

  For example, in each embodiment of the present invention, the strut mount insulator 1 is provided with the gasket 50, but the strut mount insulator 1 is not limited to the strut mount insulator 1 and may be a vibration isolation device between the piston rod 3 and the vehicle body panel 2. For example, it is not limited to struts, and other types may be used.

  In each embodiment of the present invention, the contact portion 51 of the gasket 50 is formed in an annular shape. However, the present invention is not limited to this, and the contact portion 51 of the gasket 50 should be matched with the flange portion 33 of the outer metal fitting 30. The diamond shape may be formed. In this case, in order to prevent a decrease in fastening force when the outer metal fitting 30 is fastened to the vehicle body panel 2 (see FIG. 2) with a mounting bolt (not shown), the flange portion 33 side mounting of the flange portion 33 of the outer metal fitting 30 is performed. It is desirable to cut out portions corresponding to the hole 34 and the seat portion 35. Further, the seat portion 35 is protruded upward by the thickness of the gasket 50, and the notched portion is fitted to the protruding portion of the seat portion 35, so that the gasket 50 is accurately attached to the outer metal fitting 30. Can be positioned.

It is a top view of a strut mount insulator. It is sectional drawing of the strut mount insulator in the II-II line | wire of FIG. It is a front view of a seal rubber. It is sectional drawing of the seal rubber in the IV-IV line of FIG. It is a front view of a gasket. It is an expanded sectional view of the strut mount insulator in the section line including the center of the cylindrical part of an outside metal fitting, and shows the state where the inner peripheral hole of a gasket was inserted in the cylindrical part of an outside metal fitting. It is an expanded sectional view of the strut mount insulator in the section line containing the center of the cylindrical part of an outside metal fitting, and shows the state where the opening hole of seal rubber was inserted in the cylindrical part of the outside metal fitting. It is an expanded sectional view of the strut mount insulator in the section line including the center of the cylindrical part of an outside metal fitting, and shows the state where the cylindrical part of an outside metal fitting was inserted in the penetration hole of a body panel. It is a front view of the gasket in 2nd embodiment.

Explanation of symbols

1 Strut mount insulator (vibration isolation device)
S shock absorber 2 body panel 2B insertion hole 3 piston rod 3A upper end of piston rod (one end of piston rod)
DESCRIPTION OF SYMBOLS 10 Core material 20 Insulator rubber 30 Outer metal fitting 31 Cylindrical part 33 Flange part 33A Tip part 34 Flange part side attachment hole 35 Seat part 36 Corner part 36A Corner part 36A of corner part End part of flange part side of corner part 36C Outer peripheral surface 50, 150 Gasket 51, 151 Contact part 52, 152 Inner peripheral hole 51A, 151A Inner edge (edge on inner peripheral hole side)
51B, 151B Outer edge (outer edge of contact part)
53, 153 Protrusions 53A, 153A Top 55, 155 Virtual circle r1 Inner diameter r2 of insertion hole of vehicle body panel Outer diameter at outer side of cylindrical part (outer diameter of cylindrical part)
r3 Outside diameter R1 at the flange side end of the corner part Inner diameter R3 of the inner circumferential hole O3 Diameter of the virtual circle O2 Center of the cylindrical part O4 Center of the inner circumferential hole

Claims (4)

A core member fixed to one end of a piston rod of a shock absorber, an insulator rubber that covers the core member, and a cylindrical member that accommodates the core member and the insulator rubber therein, and is formed in a body panel. A cylindrical portion inserted through the insertion hole, a flat flange portion fixed to the vehicle body panel, and a cross-section of an outer peripheral surface connecting the flange portion and the cylindrical portion and including an axis of the cylindrical portion An anti-vibration device comprising an outer metal fitting having a corner portion whose shape is inclined with respect to the axis, and interposed between the vehicle body panel and a piston rod of the shock absorber;
An inner peripheral hole having an inner diameter set larger than an outer diameter of the cylindrical portion of the outer metal fitting and set smaller than an inner diameter of the insertion hole of the vehicle body panel is formed, and the flange portion of the outer metal fitting and the vehicle body panel are formed. An annular contact portion interposed between the inner peripheral hole and the inner peripheral hole side end edge of the contact portion so as to be elastically deformable and the cylindrical portion of the outer metal fitting as the inner peripheral hole An anti-vibration device comprising a gasket having a plurality of protrusions that come into contact with the outer peripheral surface of the corner of the outer metal fitting when inserted into the outer metal fitting. The plurality of protrusions are formed in at least three or more in the same shape and are arranged at substantially equal intervals in the circumferential direction of the inner peripheral hole,
The inner diameter of the inner peripheral hole is set larger than the outer diameter at the flange-side end of the corner, and the diameter of a virtual circle that is a virtual circle formed by connecting the tips of the plurality of protrusions is 2. The vibration isolator according to claim 1, wherein the vibration isolator is set to be larger than the outer diameter at the end portion on the cylindrical portion side of the portion and smaller than the outer diameter at the end portion on the flange portion side of the corner portion.   The protrusion is formed in a mountain shape when viewed from the axial direction of the inner peripheral hole, and the top of the protrusion is formed in a curved shape that protrudes toward the axial center of the inner peripheral hole. Item 3. The vibration isolator according to item 2. A flange portion of the outer metal fitting is formed at a front end portion that is an end portion located on the opposite side of the cylindrical portion with the corner portion interposed therebetween, and a front end portion side of the flange portion, and the flange portion is connected to the body panel. A flange portion side mounting hole through which a shaft portion of a mounting bolt to be fixed is inserted, and a seat portion formed around the flange portion side mounting hole and pressed by the head of the mounting bolt, and the tip portion It extends in a tapered shape so that the width becomes narrower as it approaches the side,
When the cylindrical portion of the outer metal fitting is inserted into the inner peripheral hole of the gasket, the seat portion of the flange portion of the outer metal fitting is disposed at a predetermined interval from the outer edge of the contact portion of the gasket. The vibration isolator according to claim 3.

Images