JP4963100B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator, and more particularly to a vibration isolator capable of improving steering stability and durability.

  In general, a so-called strut mount is interposed between a suspension device such as an automobile and the vehicle body in order to absorb vibration propagating from the suspension device side to the vehicle body side. Here, a conventional strut mount will be described with reference to FIGS.

  8 is a front view of the strut mount 200, FIG. 9 is a plan view of the strut mount 200 viewed from the direction of the arrow IX in FIG. 8, and FIG. 10 is a strut mount 200 along line XX in FIG. FIG. 8 corresponds to the strut mount 200 viewed from the direction of the arrow VIII in FIG.

  As shown in FIG. 10, the strut mount 200 includes a first inner metal fitting 202 and a second inner metal fitting 203 fixed to the absorber rod 2, an outer metal fitting 204 fixed to a vehicle body (not shown), and a first inner metal fitting. A main body rubber 205 that is interposed between the metal fitting 202 and the outer metal fitting 204 and absorbs the vibration of the absorber rod 2 is provided.

  Further, as shown in FIGS. 8 to 10, in the strut mount 200, the first inner metal fitting 202 is provided by providing a straight portion 206 that is a gap disposed between the first inner metal fitting 202 and the outer metal fitting 204. The rigidity (spring constant) of the main body rubber 205 interposed between the outer metal fitting 204 and the outer metal fitting 204 is set to be small.

  As a result, the main body rubber 205 interposed between the first inner metal fitting 202 and the outer metal fitting 204 is easily elastically deformed to improve the riding comfort of the vehicle body.

  On the other hand, in order to improve the steering stability, the rigidity (spring constant) of the main rubber 205 needs to be set large in the left-right direction of the vehicle body (left-right direction in FIG. 9).

  That is, if the main rubber 205 is easily elastically deformed in the left-right direction of the vehicle body (left-right direction in FIG. 9), the main rubber 205 is greatly elastically deformed in the twisting direction, for example, when traveling on a curve.

  Therefore, since the inner metal fitting 202 also largely fluctuates in the twisting direction with respect to the outer metal fitting 204, the steering stability is inferior.

Therefore, as shown in FIGS. 8 to 10, in the strut mount 200, the straight portion 206 in the left-right direction of the vehicle body (left-right direction in FIG. 9) is filled and connected with the rubber block 205a, thereby 9), the rigidity (spring constant) of the main body rubber 205 is increased to improve the steering stability during curve traveling.
JP 2004-232824

  However, in the strut mount 200, in order to improve steering stability, when the straight portion 206 in the left-right direction of the vehicle body (left-right direction in FIG. 9) is connected by the rubber block 205a, the expansion and compression of the rubber block 205a are repeated. As a result, there is a problem that cracks are likely to occur from the connecting portion between the rubber block 205a and the main rubber 205, and the durability of the strut mount 100 is inferior due to damage to the main rubber 205.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vibration isolator capable of improving steering stability and durability.

In order to solve this object, the vibration isolator according to claim 1 includes an inner member to which an absorber rod is fixed, an outer member disposed outside the inner member and fixed to a vehicle body, and the inner member. And a main body rubber that connects the inner member and the outer member by being interposed between the inner member and the outer member and having a straight portion that is a gap disposed between the inner member and the outer member. The inner member includes a cup-shaped inner cylinder portion that opens in a direction away from the outer member in the axial direction of the absorber rod, and the left-right direction of the vehicle body. a pair of arcuate portions disposed in the inner cylinder portion upper from the so as to sandwich the absorber rod pairs while being extended in the direction of diameter outward in the radial direction of the absorber rod A pair of flange portions, and the outer member includes a cylindrical outer tube portion disposed outside the inner tube portion of the inner member, a fixed portion fixed to the vehicle body, and the outer tube Projecting from the fixed part toward the flange part in the axial direction of the absorber rod between the fixed part and the fixed part, and expanding from the upper end of the outer cylinder part outward in the radial direction of the absorber rod A protrusion extending to a position overlapping at least with the flange portion of the inner member in the direction, and the main body rubber includes a protrusion main body rubber portion formed on the protrusion of the outer member;
The flange main body rubber portion formed in the flange portion of the inner member and the flange main body rubber portion in the pair of arc portions have a certain width at the most protruding portion in the left-right direction of the vehicle in the front-rear direction of the vehicle. The flange is extended from the flange main body rubber portion of the pair of arc portions to the protrusion main body rubber portion side, and is relatively in the direction in which the inner cylinder portion of the inner member and the outer cylinder portion of the outer member approach each other. A protrusion that abuts against the protrusion main body rubber portion when displaced, and the straight portion is arcuate as viewed from a direction perpendicular to the axis of the absorber rod toward the inner cylinder portion from the protrusion. An arc-side straight portion extending in the front-rear direction of the vehicle body, and the vertical dimension of the arc-side straight portion on the inner cylinder portion side from the projection is defined as the arc in the projection portion. of side hollow portions up-and-down direction of the Is set greater than the modulus, the arcuate side hollow portion of the die cutting direction of the intermediate type set in the same direction to cure molding the longitudinal direction as the protruding portion of the protrusion to vulcanization molding by the intermediate mold, The protrusion is formed such that the width in the split surface direction becomes narrower as it is separated from the split surface of the intermediate mold, so that the end located on the front and rear sides of the vehicle as compared with the center side of the protrusion The inner side of the arc-side straightened portion is enlarged in the direction of the dividing surface in accordance with the separation from the dividing surface of the intermediate mold, so that the arc-side curled portion is separated from the dividing surface. wherein that have been formed as front and rear side of the vehicle becomes wider to.

Vibration isolating apparatus according to claim 2, wherein, in the vibration isolator of claim 1 Symbol mounting forms an abutment surface between the projection body rubber and the protrusion on the wave form.

Vibration isolating apparatus according to claim 3, wherein, in the vibration damping device according to claim 1 or 2, flat abutment surface of the projection body rubber side to form a contact surface of the protruding portion in a waveform shape It is formed in a shape.

  According to the vibration isolator of claim 1, the vibration isolator includes a main rubber interposed between the inner member to which the absorber rod is fixed and the outer member disposed outside the inner member. Therefore, the main body rubber absorbs the vibration propagated from the absorber rod and prevents the vibration from propagating to the vehicle body, and the main body rubber is a gap disposed between the inner member and the outer member. Since it is provided with a straight part, the rigidity (spring constant) of the main rubber can be reduced, and the ride comfort of the vehicle body is improved.

  Here, according to the vibration isolator according to the first aspect, the displacement amount of the main rubber can be suppressed in the facing direction of the pair of flange portions facing each other so as to sandwich the absorber rod, thereby improving the steering stability. In addition to the effect that the main body rubber is cracked from the inner peripheral side of the straight portion, the durability of the vibration isolator can be improved.

  More specifically, according to the vibration isolator of claim 1, the main body rubber includes a protrusion main body rubber portion formed on the protrusion of the outer member and a flange main body rubber formed on the flange portion of the inner member. And the flange main body rubber portion projecting from the flange main body rubber portion, and when the inner cylinder portion of the inner member and the outer cylinder portion of the outer member are relatively displaced toward each other, the protrusion A protrusion that abuts against the main body rubber, so that the inner tube portion of the inner member and the outer cylinder portion of the outer member are relatively displaced so that the protrusion comes into contact with the protrusion main body rubber portion. The rigidity (spring constant) of the main rubber can be increased in the same manner as when the protrusion main rubber part and the flange main rubber part are connected by the rubber block.

  Therefore, in the opposing direction of the pair of flange main body rubber portions, compared to the direction orthogonal to the opposing direction of the pair of flange main body rubber portions, between the flange main body rubber portion and the protruding main body rubber portion, that is, the inner member and the outer side. Since the main body rubber is hardly elastically deformed between the members, the relative displacement amount between the inner member and the outer member can be reduced.

  Therefore, since the relative displacement amount between the absorber rod fixed to the inner member and the vehicle body fixed to the outer member can be reduced, there is an effect that the steering stability can be improved as described above. is there.

  Furthermore, according to the vibration isolator of the first aspect, since the protrusion protruding toward the flange portion in the axial center direction of the absorber rod is provided, the rigidity of the outer member can be improved by the protrusion. Therefore, there is an effect that the deformation of the outer member can be prevented even when the protrusion is vigorously brought into contact with the protrusion main body rubber portion formed on the protrusion.

  According to the vibration isolator of claim 1, since the protrusion is brought into contact with the protrusion main body rubber portion formed on the protrusion, the protrusion is formed on the main rubber set at the same height as the fixed portion. Compared with the case where it abuts, the relative displacement amount between the inner member and the outer member can be set small, and as described above, there is an effect that the steering stability can be improved.

  On the other hand, according to the vibration isolator of claim 1, since the protruding portion is provided with a straight portion, that is, a gap is provided between the protruding portion and the protruding portion main body rubber portion, the inner metal fitting and the outer metal fitting are When the relative displacement is made in the separating direction, the protrusion is not stretched, and it is possible to prevent a crack from occurring at the connecting portion between the protrusion and the flange main body rubber part. This has the effect of improving the performance.

  In addition, according to the vibration isolator of claim 1, the straight portion includes an arcuate inner peripheral portion as viewed from a direction orthogonal to the axis of the absorber rod on the inner cylinder portion side of the protrusion, and the protrusion Further, the vertical dimension of the straight part on the inner cylinder part side is set larger than the vertical dimension of the straight part on the projection part.

  That is, since the straight part is provided on the inner cylinder part side from the protrusion part, the protrusion part comes into contact with the protrusion main body rubber part by relative displacement in the direction in which the inner cylinder part of the inner member and the outer cylinder part of the outer member approach. Up to this point, the main rubber can be easily elastically deformed, and the vibration propagated from the absorber rod can be absorbed by the main rubber.

  In addition, since the vertical dimension of the straight part on the inner cylinder part side of the protrusion is set larger than the vertical dimension of the straight part of the protrusion, when the protrusion is connected to the inner peripheral part of the straight part In comparison, the curvature of the arcuate inner peripheral portion of the straight portion can be set large.

  Therefore, even when the flange body rubber part is provided with a protrusion that protrudes toward the protrusion body rubber part, the flange body rubber part is compared with the case where the protrusion is connected to the inner peripheral part of the straight part. In addition, the arc-shaped inner peripheral portion of the curled portion can be formed with a large radius between the protruding main rubber portion, and the main rubber can be prevented from cracking from the inner peripheral side of the curled portion, As described above, there is an effect that the durability of the vibration isolator can be improved.

In addition, the protrusion is extended in the die-cutting direction of the intermediate mold that vulcanizes and molds the protrusion, as viewed from the axial direction of the absorber rod, and has a width in the split surface direction according to the separation from the split surface of the intermediate mold. Since the narrow portion is formed so that the die-cutting direction is vulcanized by an intermediate mold in which the die-cutting direction is set in the same direction as the longitudinal direction of the protrusion, the demolding property of the intermediate mold can be improved. There is an effect.

  More specifically, since the protrusion is extended so that the width in the split surface direction becomes smaller in accordance with the separation from the split surface of the intermediate mold in the mold release direction of the intermediate mold, the mold is removed without forcibly removing the intermediate mold. can do. Therefore, as described above, since the workability of the intermediate mold parting work is improved, there is an effect that it is possible to improve the demoldability of the intermediate mold for molding the protrusions.

According to the vibration damping device according to claim 2, wherein, in addition to the effects of the anti-vibration device according to claim 1 Symbol placement, since the formation of the contact surface between the protrusion and the protrusion main body rubber wave shape and projections Compared with the case where the contact surface with the protrusion main body rubber is formed flat, the contact area between the protrusion and the protrusion main body rubber can be reduced. Therefore, there is an effect that it is possible to prevent abnormal noise that occurs when the protrusion and the protrusion main body rubber abut.

According to the vibration isolator described in claim 3 , in addition to the effect produced by the vibration isolator described in claim 1 or 2, the contact surface on the protrusion side is formed in a wave shape and the contact on the protrusion main body rubber side. Since the contact surface is formed flat, the contact area between the protrusion and the protrusion main body rubber can be reduced compared to the case where the contact surface between the protrusion and the protrusion main body rubber is formed flat. There is an effect that can be done. Therefore, there is an effect that it is possible to prevent abnormal noise that occurs when the protrusion and the protrusion main body rubber abut.

  In addition, the corrugated contact surface is formed on the protrusion side instead of the protrusion body rubber side, so even if the intermediate mold is forcibly removed, the rubber part may be peeled off from the protrusion body rubber. There is an effect that it is difficult to cause the peeling and the demolding property of the intermediate mold can be improved.

  Specifically, the protrusion main body rubber side protrudes from the fixed portion to the flange portion side in the axial direction of the absorber rod between the outer cylinder portion and the fixed portion, and from the upper end portion of the outer cylinder portion to the radial direction of the absorber rod Since it is a part of the main rubber formed on the protrusion extending at least to the position overlapping with the flange portion of the inner member in the direction of expanding the diameter outward, the corrugated shape is applied to the contact surface on the protrusion main rubber side. If it forms, it will become easy to produce the rubber part of a protrusion main body rubber part, and the demolding property of the intermediate type which shape | molds a projection part will deteriorate.

  That is, since the protrusion main body rubber part has a rubber thickness smaller than that of the protrusion part, the protrusion main body rubber part is not easily elastically deformed. Therefore, when the intermediate mold is forcibly removed, peeling tends to occur, and when the intermediate mold is forcibly removed, a large force is required, and workability of the intermediate mold parting work is deteriorated.

  On the other hand, since the protrusion is extended further downward from the flange main body rubber portion formed with the same rubber thickness as the main protrusion rubber portion, the rubber thickness increases from the flange main body rubber portion. Compared to the flange main body rubber part, it is easily elastically deformed. Therefore, when the corrugation is formed on the abutment surface on the protrusion side, even if the intermediate mold is forcibly removed compared to the case where the corrugation is formed on the abutment surface on the protrusion main body rubber portion side. Since the protrusions are elastically deformed, it is difficult for peeling to occur, and the workability of the intermediate mold parting work is improved, so that there is an effect that the mold release property of the intermediate mold can be improved.

  Hereinafter, a strut mount 1 according to a preferred first embodiment of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG.1 and FIG.2, the whole structure of the strut mount 1 is demonstrated.

  FIG. 1 is a plan view of the strut mount 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of the strut mount 1 of FIG. The absorber rod 2 and the vehicle body (not shown) are for the purpose of absorbing vibration propagating from the absorber rod 2 side constituting a part of a suspension device (not shown) such as an automobile to the vehicle body (not shown) side. A strut mount 1 is interposed therebetween.

  As shown in FIG. 2, the strut mount 1 includes a first inner metal fitting 20 and a second inner metal fitting 30 fixed to the absorber rod 2, an outer metal fitting 40 fixed to the vehicle body, a first inner metal fitting 20 and an outer metal fitting. 40 and a main body rubber 50 interposed between the two.

  As shown in FIG. 2, the first inner metal fitting 20 is a metal member connected to the suspension device side via the absorber rod 2, and opens upward (upward in FIG. 2) and protrudes downward (downward in FIG. 2). This is a metal member having a substantially hat-shaped cross section including a cup-shaped portion and a collar-like portion extending horizontally outward from the upper end of the cylindrical portion.

  As shown in FIG. 1 or FIG. 2, the first inner metal fitting 20 is a fixed surface portion 21 to which the absorber rod 2 is fixed, and a cylinder that is formed continuously with the fixed surface portion 21 and that opens upward (upper side in FIG. 2). A cylindrical portion 22, and a linear portion 23 and an arc portion 24 that extend from the upper end portion of the cylindrical portion 22 in a direction (the left-right direction in FIG. 1) that expands radially outward of the absorber rod 2. ing.

  As shown in FIG. 2, the fixed surface portion 21 is an annular portion extending from the opening 21 a in a direction of expanding the diameter outward of the absorber rod 2, and has a second inner side which will be described later at the center. An opening 21a, which is a hole into which the fitting hole 31a of the metal fitting 30 is fitted, is formed. Note that a nut 2 a fitted to the upper end portion of the absorber rod 2 is in contact with the upper surface of the fixed surface portion 21.

  As shown in FIG. 2, the cylindrical portion 22 extends upward in the axial direction of the absorber rod 2 from the end portion (outer end portion) of the fixed surface portion 21 in the direction of expanding radially outward of the absorber rod 2 ( It is a cylindrical portion extending in a taper shape upward (upward in FIG. 2) in the axial direction of the absorber rod 2 so as to increase in diameter toward the upper side in FIG.

  As shown in FIG. 2, the plate thicknesses of the fixed surface portion 21 and the cylindrical portion 22 (dimensions in the direction orthogonal to the fixed surface portion 21 and the cylindrical portion 22) are the same as those of the fixed surface portion 31 and the cylindrical portion 32 of the second inner metal fitting 30 described later. The end portion located at the upper end in the axial direction of the absorber rod 2 of the cylinder portion 22 is formed thinner than the plate thickness (dimension in the direction orthogonal to the fixed surface portion 31 and the cylinder portion 32), and the absorber rod 2 of the cylinder portion 32 is the end portion. It is located inside (absorber rod 2 side) from the terminal portion located at the lower end in the axial direction.

  As shown in FIGS. 1 and 2, a pair of linear portions 23, 23 are disposed in the longitudinal direction of the vehicle body (vertical direction in FIG. 1), and a pair of arc portions in the lateral direction of the vehicle body (horizontal direction in FIG. 1). 24, 24 are arranged. The pair of arc portions 24 and 24 correspond to the pair of flange portions according to claim 1.

  Further, as shown in FIG. 2, the thickness of the straight portion 23 and the arc portion 24 (the dimension in the direction orthogonal to the straight portion 23 and the arc portion 24 (the dimension in the axial direction of the absorber rod 2)) is fixed to the fixed surface portion 21. And it is formed thicker than the plate | board thickness of the cylinder part 22 (dimension of the direction orthogonal to the fixed surface part 21 and the cylinder part 22). Therefore, the rigidity of the linear part 23 and the circular arc part 24 is strengthened compared to the rigidity of the fixed surface part 21 and the cylindrical part 22.

  That is, a rubber member is vulcanized and bonded to the linear portion 23 and the arc portion 24 as will be described later to form a linear portion side main body rubber portion 57 and an arc side main body rubber portion 56 which will be described later.

  The straight part side main body rubber part 57 and the arc side main part rubber part 56 function as a stopper, and come into contact with a projecting part main part rubber part 53 to be described later, so that the outer metal part 40 with respect to the first inner metal part 20 is contacted. Relative displacement can be regulated. Therefore, the straight part side main body rubber part 57 and the arc side main part rubber part 56 strongly collide with the protruding part main part rubber part 53 of the main body rubber 50.

  Therefore, by increasing the plate thickness of the straight portion 23 and the arc portion 24 (the dimension in the direction orthogonal to the straight portion 23 and the arc portion 24 (the dimension in the axial direction of the absorber rod 2)), the straight portion 23 and the arc portion are increased. Since the rigidity of 24 can be ensured, the straight portion 23 and the arc portion 24 can be prevented from being damaged by the strong impact described above.

  As shown in FIGS. 1 and 2, the pair of linear portions 23, 23 are extended from the upper end of the cylindrical portion 22 of the first inner metal fitting 20 in a direction of expanding the diameter outward of the absorber rod 2. In addition, the outer edge is a portion formed linearly in a direction connecting the pair of arc portions 24 and 24 when viewed from the axial direction of the absorber rod 2.

  As shown in FIG. 1, the extending amount of the linear portion 23 in the direction of expanding radially outward of the absorber rod 2 is set to be smaller as the distance from the arc portion 24 increases. That is, the amount of extension is set to be the smallest at the central portion of the straight line portion 23 and is set to be the largest at the end of the straight line portion 23 (connection portion with the arc portion 24). Further, the outer edges of the pair of straight portions 23, 23 are formed in a straight line parallel to each other.

  Since the straight edge 23 is formed in a straight line in the direction in which the outer edge connects the pair of arc portions 24, 24, the length of the outer edge of the straight portion 23 is set shorter than the length of the outer edge of the arc portion 24, which will be described later. The amount of rubber of the main body rubber 50 at the straight portion side main body rubber portion 57 is set to be smaller than that of the arc side main body rubber portion 56 of the main body rubber 50.

  As shown in FIG. 1 and FIG. 2, the arc portion 24 is a portion that extends from the upper end of the cylindrical portion 22 of the first inner metal fitting 20 in a direction of expanding the diameter outward of the absorber rod 2. As seen from the axial direction of the absorber rod 2, the outer edge of the arc portion 24 is formed in an arc shape along a protrusion main body rubber portion 53 of the main body rubber 50 described later.

  The length of the outer edge of the arc portion 24 is set to be longer than the length of the outer edge of the straight portion 23, and the rubber amount of the arc side main body rubber portion 56 of the main body rubber 50 described later is the straight portion side main body rubber portion of the main body rubber 50. It is set to be smaller than 57.

  As shown in FIG. 2, the second inner metal fitting 30 extends horizontally outward from the cup-shaped portion that opens downward (lower in FIG. 2) and protrudes upward (upward in FIG. 2) and the cylindrical portion. A metal member having a substantially hat-shaped cross section provided with a brim-shaped portion that is fixed to the fixing surface portion 21 of the first inner metal fitting 20. A main body rubber 50 described later is not vulcanized and bonded except for a part of the upper surface, and the metal surface is exposed.

  As shown in FIG. 2, the second inner metal fitting 30 has a fixed surface portion 31 to which the fixed surface portion 21 of the first inner metal fitting 20 is joined, and a cup-like shape that is formed continuously with the fixed surface portion 31 and opens downward. The cylinder part 32 and the linear part 33 and the circular arc part 34 which are extended from the upper end part of the cylinder part 32 in the direction which expands further to the radial direction outward of the absorber rod 2 are provided.

  As shown in FIG. 2, the fixed surface portion 31 has a fitting hole portion 31 a that protrudes upward in a cylindrical shape and is fitted into the opening portion 21 a of the fixed surface portion 21, and from the fitting hole portion 31 a to the absorber rod 2. The lower inner surface of the fixing surface portion 21 is joined to the upper surface of the fixing surface portion 31 so that the second inner metal fitting 30 is connected to the first inner metal fitting 20. It is fixed to.

  As shown in FIG. 2, the cylindrical portion 32 is downward in the axial direction of the absorber rod 2 from the end portion (outer end portion) of the fixed surface portion 31 in the direction of expanding radially outward of the absorber rod 2 (see FIG. 2). 2) is a cylindrical portion extending outwardly in a tapered shape so as to have a large diameter, and the absorber rod 2 and the absorber rod 2 are disposed in a portion surrounded by the inner peripheral surface of the cylindrical portion 32. A protective member 4 disposed on the outer periphery is disposed.

  As shown in FIG. 2, the straight portion 33 and the arc portion 34 are portions that are similarly formed corresponding to the straight portion 23 and the arc portion 24 of the first inner metal fitting 20.

  That is, as shown in FIG. 2, the pair of straight portions 33, 33 are extended from the lower end of the cylindrical portion 32 of the second inner metal fitting 30 in the direction of expanding the diameter outward of the absorber rod 2. As seen from the axial direction of the absorber rod 2, the outer edge is formed linearly in the direction connecting the pair of arc portions 34, 34.

  Further, as shown in FIG. 2, the arc portion 34 extends from the upper end of the cylindrical portion 32 of the second inner metal fitting 30 in the direction of expanding the diameter outward of the absorber rod 2, and the absorber rod 2. When viewed from the axial center direction, the outer edge is formed in an arc shape along a protruding end portion 41a of the outer metal fitting 40 described later.

  As shown in FIG. 2, a gap 3 that is a constant gap is provided between the second inner metal fitting 30 and the main body rubber 50 interposed between the first inner metal fitting 20 and the outer metal fitting 40. It has been.

  Specifically, as shown in FIG. 2, between the straight portion 33 and the arc portion 34 and the lower surface of the cylindrical portion 51 vulcanized and bonded to the inner peripheral surface of the outer cylindrical portion 41 of the outer metal fitting 40 described later. The first gap portion 3 a is formed along the outer peripheral surface of the cylindrical portion 32 and is an annular gap when viewed from the axial direction of the absorber rod 2.

  Further, as shown in FIG. 2, it is formed along the outer peripheral surface of the cylindrical portion 32 between the fixed surface portion 31 and the inner peripheral surface of the cylindrical portion 32, and has a cylindrical shape as viewed from the axial direction of the absorber rod 2. A second gap 3b that is a gap is provided.

  As shown in FIG. 2, the cylinder portion 51 is formed by vulcanizing and molding only a small amount of a rubber member into an outer cylinder portion 41 described later, and therefore, the absorber rod 2 on the linear portion 33 side compared to the arc portion 34 side. In the direction of the axis (vertical direction in FIG. 2) and the direction perpendicular to the axis of the absorber rod 2 (horizontal direction in FIG. 2).

  That is, since the amount of the rubber member vulcanized and bonded to the outer cylinder portion 41 is smaller on the straight portion 33 side than on the arc portion 34 side, the second gap portion 3b has a straight portion compared to the arc portion 34 side. The gap is set to gradually increase on the 33 side.

  As shown in FIGS. 1 and 2, the outer metal fitting 40 is a metal member fixed to the vehicle body, and is disposed outside the cylinder portion 22 of the first inner metal fitting 20 and the cylinder portion 32 of the second inner metal fitting 30. Projecting upward in the axial direction of the absorber rod 2 from the fixed portion 43 between the outer cylindrical portion 41 and the fixed portion 43 described later, and from the upper end of the outer cylindrical portion 41 A projecting portion 42 extending from the edge of the arc portion 24 in the axial direction of the absorber rod 2 in a direction in which the diameter of the absorber rod 2 is expanded outward, and a fixing portion 43 that is fixed to the vehicle body. A fastening surface portion 44 in which the fixing portion 43 is formed, and a non-fastening surface portion 45 formed so as to surround the fastening surface portion 44 along the fastening surface portion 44.

  As shown in FIG. 2, the outer cylinder part 41 is a cylindrical part formed so that the center part protrudes inward so that the center part is closer to the center side (absorber rod 2 side) than the upper end and the lower end. The arc portion 24 side is formed longer in the axial direction of the absorber rod 2 than the linear portion 23 side, and the lower end on the arc portion 24 side includes a projecting end portion 41a extending outward. ing.

  Since the outer cylinder part 41 is formed so that the center part protrudes inward in the axial center direction of the absorber rod 2, the rigidity can be improved and the outer cylinder part 41 extends in the axial center direction of the absorber rod 2. Compared to the case where they are formed to have the same diameter, the amount of rubber of a connecting portion 52 described later disposed between the outer cylinder portion 41 of the outer metal fitting 40 and the cylinder portion 22 of the first inner metal fitting 20 may be reduced. Therefore, the rigidity (spring constant) of the connecting portion 52 can be reduced.

  As shown in FIG. 2, the projecting portion 42 extends from the upper end portion of the outer cylindrical portion 41 to the outside of the outer edges of the linear portion 23 and the arc portion 24 in the direction of expanding the diameter outward of the absorber rod 2. And is formed in an annular shape that is slightly larger than the arc portion 24 when viewed from the axial direction of the absorber rod 2.

  As shown in FIG. 2, the protrusion 42 protrudes upward from the fixed portion 43 fixed to the vehicle body, so that the rigidity of the outer metal fitting 40 is improved. Therefore, even when the protrusion 58 described later is vigorously brought into contact with the protrusion main body rubber portion 53 vulcanized and bonded to the protrusion 42, the deformation of the outer metal fitting 40 can be prevented.

  Further, as shown in FIG. 2, the protrusion 42 protrudes upward from the fixing portion 43 fixed to the vehicle body, and therefore the protrusion 42 is arcuate from the fixing portion 43 in the axial direction of the absorber rod 2. It is arranged at a position close to the portion 24.

  As shown in FIGS. 1 and 2, the fixing portion 43 is a portion that is attached to the vehicle body, and includes an insertion hole 43 a that is a hole into which a fixing member (not shown) such as a bolt is inserted, and the absorber rod 2. A nut portion 43b protruding downward is provided integrally with the fastening surface portion 44 by burring along the insertion hole 43a in the axial direction.

  The fixing portion 43 is formed on the fastening surface portion 44 where the metal portion of the outer metal fitting 40 is exposed from the main body rubber 50. The fastening surface portion 44 is formed in a spherical shape that curves upward, and in the first embodiment, as shown in FIG.

  As shown in FIGS. 1 and 2, a non-fastening surface portion 45 dropped through a step is provided around the fastening surface portion 44 so as to surround the fastening surface portion 44. The non-fastening surface portion 45 is formed in a planar shape with respect to the fastening surface portion 44 having a spherical shape, and is formed one step lower than the fastening surface portion 44. Therefore, the non-fastening surface portion 45 is arranged in a state of being fixed to the vehicle body, being in a non-contact state with the vehicle body, and facing the vehicle body through a slight gap.

  As shown in FIG. 2, the portion connecting the non-fastening surface portion 45 and the protrusion 42 is formed in a bellows shape in which the cross-sectional shape in the axial direction of the absorber rod 2 is continuously curved up and down. Thereby, the outer metal fitting 40 is improving the rigidity of the part between the protrusion part 42 and the non-fastening surface part 45. FIG.

  As shown in FIG. 1 or FIG. 2, the main body rubber 50 is a rubber member that is mainly interposed between the first inner metal fitting 20 and the outer metal fitting 40 and absorbs vibration propagated from the absorber rod 2. It is interposed between the cylinder part 51 vulcanized and bonded to the inner peripheral surface of the lower part of the outer cylinder part 41 of the outer metal part 40, and the outer cylinder part 41 of the outer metal part 40 and the cylinder part 22 of the first inner metal part 20. The connecting portion 52, the protrusion main body rubber portion 53 vulcanized and bonded to the upper surface of the protrusion 42 of the outer metal fitting 40, the outer peripheral surface of the cylindrical portion 41 of the outer metal fitting 40 and the lower surface of the protrusion 42 of the outer metal fitting 40 are added. An outer peripheral portion 54 to be vulcanized and bonded, an arc side main body rubber portion 56 to be vulcanized and bonded to the arc portion 24, a straight portion side main body rubber portion 57 to be vulcanized and bonded to the straight portion 23, and an arc side main body rubber portion 56. Projecting from the projecting part main body rubber part 53 side, the first inner metal fitting 20 and the outer metal fitting 4 A protrusion that regulates the relative displacement of the first inner metal piece 20 with respect to the outer metal piece 40 by abutting against the protrusion 42 of the outer metal piece 40 when the first inner metal piece 20 is relatively displaced in a direction approaching the outer metal piece 40. Part 58.

  As shown in FIG. 2, the cylindrical portion 51 is a cylindrical rubber portion that is vulcanized and bonded to the inner peripheral surface of the outer cylindrical portion 41 of the outer metal fitting 40 along the cylindrical portion 32 of the second inner metal fitting 30. The arc portion 24 side is formed thicker in the direction perpendicular to the cylinder portion 51 than the straight portion 23 side (direction perpendicular to the axis of the absorber rod 2 (left and right direction in FIG. 2)), and the axial direction of the absorber lot 2 ( It is formed long in the vertical direction of FIG.

  As a result, the rigidity (spring constant) of the cylindrical portion 51 of the main rubber 50 is greater than the pair of linear portions 23, 23 in the opposite direction, that is, the longitudinal direction of the vehicle body (vertical direction in FIG. 1). 24 is set higher in the opposite direction, that is, in the left-right direction of the vehicle body (left-right direction in FIG. 1).

  Therefore, in the left-right direction of the vehicle body (left-right direction in FIG. 1), it is difficult to elastically deform the main body rubber 50, so that the vehicle body can be prevented from being greatly inclined in the left-right direction (left-right direction in FIG. 1) during curve driving. The steering stability can be improved and the main rubber 50 is easily elastically deformed in the longitudinal direction of the vehicle body (vertical direction in FIG. 1) to absorb the vibration propagated from the absorber rod 2. Riding comfort can be improved.

  As shown in FIG. 2, the connecting portion 52 is a rubber portion interposed between the inner peripheral surface of the upper portion of the outer cylindrical portion 41 of the outer metal fitting 40 and the outer peripheral surface of the cylindrical portion 22 of the first inner metal fitting 20. In addition, a tick part 60, which will be described later, is disposed at the top.

  As shown in FIGS. 1 and 2, the protrusion main body rubber portion 53 is a rubber portion that is vulcanized and bonded in an annular manner to the upper surface of the protrusion 42 of the outer metal fitting 40, and the outer edge of the protrusion main body rubber portion 53 is It is set to be slightly larger than the outer edge of the arc-side main body rubber portion 56.

  The protrusion main body rubber part 53 mainly restricts the relative displacement between the first inner metal fitting 20 and the outer metal fitting 40 by coming into contact with the arc-side main rubber part 56. Note that the upper surface of the protrusion main body rubber portion 53 serves as an abutting surface that abuts against a protrusion 58 described later.

  Further, the protrusion 58 is brought into contact with the protrusion main body rubber portion 53 vulcanized and bonded to the protrusion 42 protruding upward in the axial direction of the absorber rod 2. Therefore, the relative displacement amount between the first inner metal fitting 20 and the outer metal fitting 40 can be set smaller than in the case where the protrusion 42 is not protruded upward, and the steering stability can be improved.

  As shown in FIG. 2, the outer peripheral portion 54 is formed on the outer peripheral surface of the outer tubular portion 41 and the lower surface of the protruding portion 42 along the lower surface of the outer cylindrical portion 41 of the outer metallic member 40 and the protruding portion 42 of the outer metallic member 40. It is a rubber part that is vulcanized and bonded so as to be connected, and the rigidity of the outer metal fitting 40 is improved.

  As shown in FIGS. 1 and 2, the arc-side main body rubber portion 56 is a rubber portion that is vulcanized and bonded to the arc-shaped portion 24, and an arc-side straight portion 61, which will be described later, below the arc-side main body rubber portion 56. Is arranged. The arc-side main body rubber portion 56 corresponds to the flange main body rubber portion of claim 1.

  As described above, the rubber amount of the arc-side main body rubber portion 56 is set to be larger than that of the straight portion-side main body rubber portion 57 of the main body rubber 50.

  As a result, the arc-side main body rubber portion 56 abuts against the protruding portion main body rubber portion 53 as compared with the straight portion-side main body rubber portion 57, so that the displacement of the first inner metal fitting 20 relative to the outer metal fitting 40 is caused by the arc-side main rubber portion 56. Is regulated.

  Therefore, particularly when the vehicle is traveling on a curve, the vehicle body can be prevented from being greatly inclined in the left-right direction (left-right direction in FIG. 1), so that the steering stability can be improved.

  As shown in FIGS. 1 and 2, the straight portion side main body rubber portion 57 is a rubber portion that is vulcanized and bonded to the straight portion 23, and is a straight side straightening described below below the straight portion side main portion rubber portion 5. A portion 64 is provided.

  As described above, the outer edge of the straight portion 23 is formed in a straight line in the direction connecting the pair of arc portions 24, 24, so the length of the outer edge of the straight portion 23 is set shorter than the length of the outer edge of the arc portion 24. In addition, the rubber amount of the straight part side main body rubber part 57 of the main body rubber 50 to be described later is set to be smaller than that of the arc side main body rubber part 56 of the main body rubber 50.

  Thereby, compared with the arc-side body rubber part 56, the straight part-side body rubber part 57 does not come into contact with the protruding part body rubber part 53, so the first inner metal part 20 with respect to the outer metal part 40 by the straight part-side body rubber part 57. Displacement is not regulated.

  Therefore, since the vibration in the longitudinal direction of the vehicle body (vertical direction in FIG. 1) can be absorbed as compared with the lateral direction of the vehicle body (horizontal direction in FIG. 1), the riding comfort can be improved.

  Further, as shown in FIGS. 1 and 2, since the protruding portion 58 of the straight portion-side main body rubber portion 57 does not protrude, in the longitudinal direction () of the vehicle body, which is the opposing direction of the straight portion-side main portion rubber portion 57, The rigidity (spring constant) of the connecting portion 52 of the main rubber 50 is set to be smaller than the left-right direction of the vehicle body (the left-right direction in FIG. 1), which is the opposing direction of the arc-side main rubber portion 56.

  Therefore, the connecting portion 52 of the main rubber 50 is easily elastically deformed in the longitudinal direction of the vehicle body (vertical direction in FIG. 1), and in the longitudinal direction of the vehicle body (vertical direction in FIG. 1), Since vibration can be absorbed, riding comfort can be improved.

  As shown in FIGS. 1 and 2, the protrusion 58 is a rubber portion extending from the lower surface of the arc-side main body rubber portion 56 toward the upper surface of the protrusion main body rubber portion 53.

  As shown in FIG. 1 or FIG. 2, relative displacement occurs in a direction in which the cylindrical portion 22 of the first inner metal fitting 20 and the outer cylindrical portion 41 of the outer metal fitting 40 approach each other, and the protrusion 58 contacts the protrusion main body rubber portion 53. By contacting, the rigidity (spring constant) of the connecting portion 52 of the main rubber 50 can be increased in the same manner as when the protruding main rubber portion 53 and the arc-side main rubber portion 56 are connected by a rubber block.

  Next, the protrusion 58 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a front view of the strut mount 1 of FIG. 1 as viewed from the direction of arrow III, and FIG. 4 is a cross-sectional view of the strut mount 1 in which the portion A of FIG. 3 shows the left part of the strut mount 1. In FIG. 3, the non-fastening surface portion 45 and the fastening surface portion 44 of the outer metal fitting 40 are illustrated in a simplified manner. Moreover, the B part of FIG. 4 expands and shows the arc-side curled part 61.

  Here, returning to FIG. 1, the shape of the protrusion 58 will be described. As shown in FIG. 1, the protruding portion 58 extends along the outer edge of the arc-side main body rubber portion 56 in a direction orthogonal to the linear portion 23, and thus the protruding portion 58 is viewed from the axial center direction of the absorber rod 2. The outer edge is formed in an arc shape, and the inner edge of the projection 58 is formed in a straight line shape.

  That is, as shown in FIG. 1, the protrusion 58 has a certain width in the left-right direction of the vehicle body (left-right direction in FIG. 1) and extends in the front-rear direction of the vehicle body (up-down direction in FIG. 1). The width of the protruding portion 58 in the left-right direction of the vehicle body (the left-right direction in FIG. 1) is larger than that of the central portion side of the protruding portion where a split surface 72c (see FIG. 6) of the intermediate molds 72-1 and 72-2 described later is located. The end portion side (the connecting portion between the arc-side main body rubber portion 56 and the straight portion side main body rubber portion 57) of the protrusion 58 located on the front and rear side (upper and lower sides in FIG. 1) of the vehicle is narrowed. .

  Further, as shown in FIG. 1, the protruding portion 58 is formed in a portion that protrudes most in the left-right direction (left-right direction in FIG. 1) of the arcuate body rubber portion 56. Therefore, the main rubber 50 is set so as not to be elastically deformed in the twisting direction in the left-right direction of the vehicle body (left-right direction in FIG. 1), and thus the steering stability can be improved.

  Here, referring back to FIG. 3 or FIG. 4, the protrusion 58 becomes a protrusion main body rubber portion 53 due to relative displacement in a direction in which the tube portion 22 of the first inner metal fitting 20 and the outer tube portion 41 of the outer metal fitting 40 approach each other. The case of contact will be described.

  As shown in FIGS. 3 and 4, the protrusion 58 comes into contact with the protrusion main body rubber portion 53 by relative displacement in the direction in which the tube portion 22 of the first inner metal fitting 20 and the outer tube portion 41 of the outer metal fitting 40 approach each other. Accordingly, the rigidity (spring constant) of the connecting portion 52 of the main rubber 50 can be increased in the same manner as when the protruding main rubber portion 53 and the arc-side main rubber portion 56 are connected by the rubber block.

  Therefore, compared to the front-rear direction of the vehicle body (the front direction to the rear direction in FIG. 4), which is the opposing direction of the pair of linear portions 23, 23, the left-right direction of the vehicle body (FIG. 4) is the opposite direction of the pair of arc portions 24, 24. In the left-right direction), the connecting portion 52 of the main rubber 50 is hardly elastically deformed between the arc-side main rubber portion 56 and the protruding main rubber portion 53, that is, between the first inner metal fitting 20 and the outer metal fitting 40. Therefore, the relative displacement amount between the first inner metal fitting 20 and the outer metal fitting 40 can be reduced.

  Accordingly, it is possible to make it difficult for the connecting portion 52 of the main rubber member 50 to be elastically deformed when traveling on a curve or the like, so that the steering stability can be improved.

  As shown in FIGS. 3 and 4, the lower surface 58 a of the projecting portion 58 serves as an abutting surface that contacts the projecting body rubber portion 53, and the lower surface 58 a of the projecting portion 58 is orthogonal to the axis of the absorber rod 2. It is formed in a wave shape when viewed from the direction of the arc portion (front side in FIG. 3, right side in FIG. 4).

  Thereby, compared with the case where the lower surface 58a of the protrusion part 58 is formed in a flat shape, the contact area between the protrusion part 58 and the protrusion main body rubber part 53 can be reduced. Therefore, it is possible to prevent noise generated when the protrusion 58 and the protrusion main body rubber 53 come into contact with each other.

  In the first embodiment of the present invention, the lower surface 58a of the protrusion 58, which is the contact surface on the protrusion 58 side, is formed in a wave shape, but the contact surface on the protrusion main body rubber portion 53 side. Even when the upper surface 53a of the protrusion main body rubber portion 53 is formed in a wave shape, the same is true, and the noise generated when the protrusion 58 and the protrusion main body rubber 53 abut is prevented. Can do.

  That is, when the upper surface 53a of the protrusion main body rubber portion 53 is formed in a wave shape when viewed from the arc portion 24 side (the front side in FIG. 3 and the right side in FIG. 4) in the direction orthogonal to the axis of the absorber rod 2. Even if it exists, the abnormal noise which generate | occur | produces when the protrusion 58 part and the protrusion main body rubber | gum 53 contact | abut can be prevented.

  Further, as shown in FIG. 3 or FIG. 4, the protrusion 58 is extended from the lower surface of the arc-side main body rubber portion 56 with a certain dimension, so that the rubber thickness of the arc-side main body rubber portion 56 (the axis of the absorber rod 2 is reduced). The rubber thickness of the protrusion 58 (dimension in the axial direction of the absorber rod 2 (vertical direction in FIGS. 3 and 4)) is formed thicker than the central direction (dimension in the vertical direction in FIGS. 3 and 4). Therefore, the rigidity (spring constant) of the outer edge portion of the arc-side main body rubber portion 56 can be increased.

  Further, as shown in FIG. 4, an inner end 58 a 1 that is an inner end (left side in FIG. 4) of the protrusion 58 is formed in the axial direction of the lower surface portion 63 c of the second curb portion 63 and the absorber rod 2 described later. Overlapping positions are set. That is, the outer end of the lower surface portion 63c of the second curb portion 63 described later is set outside the outer end of the upper surface portion 63b of the second curb portion 63 described later.

  As shown in FIG. 3, the main rubber member 50 includes a straight portion 60 that is a gap disposed between the first inner metal fitting 20 and the outer metal fitting 40.

  As shown in FIG. 3, the straight portion 60 is formed by connecting the rubber portion of the connecting portion 52 of the main body rubber 50 that connects the cylindrical portion 22 of the first inner metal fitting 20 and the outer cylindrical portion 41 of the outer metal fitting 40 to the first inner metal fitting 20. It is a gap formed by hollowing out along the cylindrical portion 22 (see FIG. 2).

  As described above, since the straight portion 60 which is a gap disposed between the first inner metal fitting 20 and the outer metal fitting 40 is provided, the main body rubber 50 absorbs vibration propagated from the absorber rod 2 and The vibration can be prevented from propagating to the vehicle body, and the rigidity (spring constant) of the main rubber 50 can be reduced, so that the riding comfort of the vehicle body can be improved.

  As shown in FIG. 4, the curving portion 60 includes a straight curling portion 64 (see FIG. 2), an arc-side curling portion 61 having a first curling portion 62 on the outer peripheral side and a second curling portion 63 on the inner peripheral side. And. The straight-side curled portion 64 (see FIG. 2) is a gap disposed between the straight-portion-side main body rubber portion 57 and the protrusion main-body rubber portion 53.

  Further, since the straight side straight portion 64 and the second straight portion 63 described later of the arc side straight portion 61 are formed around the cylindrical portion 22 along the cylindrical portion 22 of the first inner metal fitting 20, The curvature of the inner peripheral portion 64a (see FIG. 2) of the side curled portion 64 is set to be the same as the curvature of the inner peripheral portion 63 of the second curled portion 63, which will be described later, of the arc-side curled portion 61.

  As shown in FIG. 3 or FIG. 4, the first straight portion 62 is disposed on the outer edge side of the arc-side main body rubber portion 56. The first curled portion 62 is a gap disposed between the upper surface 53 a of the projecting portion main rubber portion 53 and the lower surface 58 a of the projecting portion 58, and the projecting portion 58 is disposed on the first curled portion 62. By being provided, the vertical dimension of the first curb portion 62 is set smaller than the vertical dimension of the second curb portion 63.

  As shown in FIG. 4, a protrusion 58 is disposed in the first curb portion 62, that is, the protrusion 58 extends downward (lower side in FIG. 4) from the bottom surface of the arc-side main body rubber portion 56. As a result, the outer edge side of the arc-side main body rubber portion 56 is formed thicker in the vertical direction (the vertical direction in FIG. 4) than the cylindrical portion 22 side of the first inner metal fitting 20.

  Therefore, the relative displacement amount between the cylindrical portion 22 of the first inner metal fitting 20 and the outer cylindrical portion 41 of the outer metal fitting 40 in the left-right direction of the vehicle body (left-right direction in FIG. 4) compared to the case where the protrusion 58 is not provided. Can be set small.

  Thus, the direction in which the cylindrical portion 22 of the first inner metal fitting 20 and the outer cylindrical portion 41 of the outer metal fitting 40 approach each other (the first inner metal fitting 20 is downward (downward in FIG. 4), and the outer metal fitting 40 is upward (upper in FIG. 4). )) And the protrusion 58 comes into contact with the protrusion main body rubber portion 53, so that the protrusion main body rubber portion 53 and the arc portion main body rubber portion 56 are connected to each other by a rubber block. In the left-right direction (the left-right direction in FIG. 4), the rigidity (spring constant) of the main rubber 50 can be increased.

  Therefore, after the protrusion 58 comes into contact with the protrusion main body rubber portion 53, the first in the left-right direction of the vehicle body (the left-right direction in FIG. 4) compared to the front-rear direction of the vehicle body (from the front to the back in FIG. 4). Since the inner metal fitting 20 is less likely to be displaced relative to the outer metal fitting 40, for example, the connecting portion 52 of the main body rubber 50 is not greatly elastically deformed in the left-right direction of the vehicle body (the left-right direction in FIG. 4) when traveling on a curve. Steering stability is improved.

  In addition, as shown in FIG. 3 or FIG. 4, a certain clearance is provided by the first straight portion 62 between the upper surface 53 a of the protruding portion main rubber portion 53 and the lower surface 58 a of the protruding portion 58. . That is, the arc main body rubber part 56 and the protrusion main body rubber part 53 are not connected by the protrusion 58.

  Therefore, the direction in which the cylindrical portion 22 of the first inner metal fitting 20 and the outer cylindrical portion 41 of the outer metal fitting 40 are separated (the first inner metal fitting 20 is upward (upward in FIG. 4), and the outer metal fitting 40 is downward (lower in FIG. 4). )), The protrusion 58 moves upward along with the arc-side main rubber part 56, and the first straight part 62 becomes larger by the amount of the movement.

  Therefore, since the protrusion 58 does not extend, it is possible to prevent a crack from occurring at the connecting portion between the protrusion 58 and the arcuate body rubber part 56, and to improve the durability of the strut mount 1.

  Moreover, as shown in FIG. 4, the protrusion 58 is formed only on the outer edge side. In other words, the second curly portion 62 whose vertical dimension is set larger than that of the first curly portion 62 is formed on the arcuate body rubber portion 56 on the cylindrical portion 22 side of the first inner metal fitting 20.

  Therefore, the rigidity (spring constant) of the connecting portion 52 of the main rubber 50 is small and easily elastically deformed until the protrusion 58 contacts the protruding main rubber portion 53 in the left-right direction of the vehicle body. Has improved.

  Further, as shown in FIG. 4, the second curb portion 63 is located on the tube portion 22 side of the first inner metal fitting 20 from the projection portion 56, and the straight portion 23 in the direction orthogonal to the axis of the absorber rod 2 (see FIG. 2). As viewed from the side (the front side in FIG. 4), the vertical dimension of the second curb portion 63 is provided with an arc-shaped inner peripheral portion 63a and is a curb portion on the tube portion 22 side of the first inner metal fitting 20 from the protrusion 58. Is set to be larger than the vertical dimension of the first curb portion 62 which is the curb portion of the protrusion.

  Thereby, compared with the case where the projection part 58 is connected with the inner peripheral part 63a of the 2nd curling part 63, the curvature of the inner peripheral part 63a can be set large.

  Therefore, as shown in FIG. 3 or FIG. 4, the arc portion main body rubber portion 56 is provided with a protrusion 58 that protrudes toward the protrusion main portion rubber portion 53 to increase the rigidity (spring constant) of the arc portion main portion rubber portion. Even in this case, the arc-shaped inner peripheral portion 63a of the second straight portion 63 can be formed with a large radius compared to the case where the protrusion 58 is connected to the inner peripheral portion 63a of the second straight portion 63. it can.

  Therefore, it is possible to prevent the connecting portion 52 of the main rubber 50 from cracking from the arc-shaped inner peripheral portion 63a of the second straight portion 63, and the durability of the strut mount 1 can be improved.

  The second curb portion 63 will be described with reference to FIG. As shown in FIG. 4, the second curb portion 63 is disposed at a position overlapping the outer tube portion 41 in the axial direction of the absorber rod 2, and the inner peripheral portion 63 a on the tube portion 22 side of the first inner fitting 20. The lower surface portion 63c is formed continuously with the lower end of the inner peripheral portion 63a and is set below the upper surface 53a of the protrusion main body rubber portion 53 (downward in FIG. 4), and is continuous with the upper end of the inner peripheral portion 63a. And an upper surface portion 63b set above the lower surface 58a of the projection 58 (upward in FIG. 4).

  As shown in FIG. 4, the lower surface portion 63 c of the second curb portion 63 is formed in an arc shape when viewed from the linear portion 23 side (front side in FIG. 4) in the direction orthogonal to the axis of the absorber rod 2. At the same time, the upper surface portion 63b of the second curb portion 63 is formed in an L shape when viewed from the linear portion 23 side (the front side in FIG. 4) in the direction orthogonal to the axis of the absorber rod 2.

  Also, as shown in FIG. 4, the upper surface portion 63b of the second curly portion 63 is set above the lower surface 58a of the projection 58 (upward in FIG. 4). Compared with the case where the height is set to the same level as the lower surface 58a of the protrusion 58, the radius of the arc-shaped inner peripheral portion 63a can be set larger.

  Therefore, since the crack of the connecting portion 52 of the main body rubber 50 hardly occurs from the inner peripheral portion 63a side of the second straight portion 63, the durability of the strut mount 1 can be improved.

  As shown in FIG. 4, the lower surface portion 63c of the second curly portion 63 is set below the upper surface 53a of the protrusion main body rubber portion 53 (downward in FIG. 4). Can be set larger than the case where the height of the protrusion main body rubber portion 53 is set to the same height as the upper surface 53 a of the protrusion main body rubber portion 53.

  Thereby, since a crack is hard to be generated from the inner peripheral part 63a side of the second straight part 63 of the connecting part 52 of the main rubber 50, the durability of the strut mount 1 can be improved.

  In the first embodiment, the radius R1 of the inner peripheral portion 63a of the second curb portion 63 is set to 3 mm. The upper surface portion 63b of the second curb portion 63 is set to the same height as the lower surface 58a of the projection portion 58, and the lower surface portion 63c of the second curb portion 63 is set to the same height as the upper surface 53a of the protrusion main body rubber portion 53. Since the radius R2 of the virtual inner peripheral surface 62a hypothesized by this is 0.5 mm, the radius of the inner peripheral portion 63a of the second straight portion 63 is set larger than the radius of the virtual inner peripheral portion 62a. Yes.

  As shown in FIG. 4, the upper surface 63 b of the second curb portion 63 is formed in an L shape when viewed from the straight portion 23 side (the front side in FIG. 4) in the direction orthogonal to the axis of the absorber rod 2. However, the direction in which the cylindrical portion 22 of the first inner metal fitting 20 and the outer cylindrical portion 41 of the outer metal fitting 40 are separated (the first inner metal fitting 20 is upward (upward in FIG. 4), and the outer metal fitting 40 is downward (in FIG. 4). It is the inner peripheral portion 63a side of the connecting portion 52 of the main rubber 50 that expands when it is relatively displaced downward)).

  Therefore, since the rubber part of the upper surface 63b of the second curly part 63 does not expand as compared with the inner peripheral part 63a side of the connecting part 52 of the main rubber 50, the rubber part is expanded on the upper surface 63b of the second curly part 63. No damage will occur.

  However, the direction in which the tube portion 22 of the first inner metal fitting 20 and the outer tube portion 41 of the outer metal fitting 40 approach each other (the first inner metal fitting 20 is downward (downward in FIG. 4) and the outer metal fitting 40 is upward (upper in FIG. 4). ) And the protrusion 58 comes into contact with the protrusion main body rubber portion 53, and the protrusion 58 is compressed. Therefore, damage due to the compression occurs.

  Therefore, by forming the upper surface 63b of the second straight portion 63 in an arc shape, it is possible to prevent a crack from occurring at the corner portion of the upper surface 63b of the second straight portion 63 due to damage caused by compression. .

  Next, a method for manufacturing the strut mount 1 will be described with reference to FIGS. 5 and 6 show cases where the strut mount 1 is manufactured using a mold 70, respectively.

  5 is a cross-sectional view of the arc portion 24 of the mold 70. FIG. 6 is a first view of the intermediate mold 72 viewed from the axial direction of the absorber rod 2 with the upper mold 71 of the mold 70 removed. The top view of the inner metal fitting 20 and the intermediate mold 72 is shown. 5 corresponds to a cross section taken along line VV in FIG.

  As shown in FIG. 5, the mold 70 includes an upper mold 71 disposed on the upper side of the first inner metal fitting 20, a lower mold 73 disposed on the lower side of the outer metal fitting 40 and the first inner metal fitting 20, It is composed of a pair of intermediate molds 72-1 and 72-2 sandwiched between an upper mold 71 and a lower mold 73, and is formed of mold steel.

  As shown in FIG. 5, the upper mold 71, the intermediate molds 72-1 and 72-2, and the lower mold 73 are stacked one above the other with the first inner metal fitting 20 and the outer metal fitting 40 arranged on the lower mold 73. As a result, a cavity 74, which is a space in which the rubber member is filled into the molding die 70 and the main rubber 50 is molded, is formed.

  Since the pair of intermediate molds 72-1 and 72-2 are formed in the same manner with respect to the portion where the straight portion 60 is molded, the intermediate mold 72-1 will be described and the description of the intermediate mold 72-2 will be omitted. .

  As shown in FIG. 5, the intermediate die 72-1 includes a collar portion 72A that is disposed between the first inner metal fitting 20 and the outer metal fitting 40 to form the straight portion 60, and the collar portion 72A is an absorber rod. When viewed from the axial direction of 2, the portion opposed to the straight line portion 23 is formed in a substantially semicircular shape with a straight line cut out.

  As shown in FIG. 5 or FIG. 6, the collar portion 72A includes an outer edge portion 72d that forms the outer edge of the arc-side main rubber portion 56 together with the outer edge portion 71d of the upper mold 71, and an inner side from the outer edge portion 72d (center side in FIG. 5). And a projecting portion 72a extending from the connecting portion 72b2 to the inner side (center side in FIG. 5) to form the second curly portion 63. ing.

  As shown in FIG. 6, the outer edge portion 72 d of the intermediate mold 72 includes an arc portion 72 d 1 that molds the outer edge of the arc-side main body rubber portion 56 and a linear portion 72 d 2 that molds the linear portion-side main body rubber portion 57.

  As shown in FIG. 5, the connecting portion 72b2 is a recess formed on the upper surface of the intermediate mold 72-1 and is in a direction perpendicular to the split surface 72c from the split surface 72c of the intermediate mold 72-1 (upper and lower parts in FIG. 6). Direction). The connecting portion 72b2 includes a recess 72b1 that is a space on the upper side. The protrusion 58 (see FIG. 4) is molded by the recess 72b1.

  As shown in FIG. 5, the intermediate die 72-1 includes a pressing portion 72e that contacts the upper surface of the lower die 73, and the upper portion (upward in FIG. 5) is between the pressing portion 72e and the lower surface of the connecting portion 72b2. A curved surface 72f that is curved is formed. An upper surface 53a of the protrusion main body rubber portion 53 is formed by the curved surface 72f and the lower surface of the connecting portion 72b2.

  As shown in FIG. 5, the outer edge of the connecting portion 72b2 is formed in the arc portion 72d1 of the intermediate die 72-1, and the inner edge of the connecting portion 72b2 is the straight line portion of the outer edge of the protruding portion 72a of the intermediate die 72-1. Match.

  Next, with reference to FIG.5 and FIG.6, the shaping | molding method of the strut mount 1 is demonstrated. First, the outer metal fitting 40 and the first inner metal fitting 20 are set on the lower mold 73. In this case, the outer metal fitting 40 can be positioned at a relative position in the circumferential direction by fitting the nut portion 43 b of the fixing portion 43 into the concave portion 73 a of the lower mold 73.

  Thereafter, as shown in FIGS. 5 and 6, the protrusion 73 b of the lower mold 73 is fitted into the opening 21 a of the first inner metal fitting 20, and the left and right intermediate molds 72-1 and 72-2 are connected to the lower mold 73. It is made to approach from the both sides of the outer metal fitting 40 set to (1).

  Further, as shown in FIGS. 5 and 6, the arc portion 24 of the first inner metal fitting 20 and the arc portion 72d1 of the intermediate die 72 are fixed to each other while the non-fastening surface portion 45 and the pressing portion 72e are in contact with each other. After making it face in the state holding the gap and making the straight part 23 of the first inner metal fitting 20 and the straight part 72d2 of the intermediate die 72 face each other in a state of keeping a certain gap, the intermediate dies 72-1 and 72- By closing 2, the alignment of the first inner metal fitting 20 is completed.

  As shown in FIG. 5, after the positioning of the first inner metal fitting 20 is completed, the upper die 71 approaches the lower die 73 and the intermediate dies 72-1 and 72-2, and the mold is clamped, and the rubber material is cavityd. The main body rubber 50 is vulcanized and molded by filling in 74.

  After the vulcanization molding, the first inner metal fitting 20 and the outer metal fitting 40 are taken out via the main body rubber 50, and the second inner metal fitting 30 is caulked and fixed to the first inner metal fitting 20.

  As shown in FIG. 5, in the strut mount 1, when the main body rubber 50 is vulcanized, the pressing portion 72 e provided in the intermediate die 72 is pressed against the non-fastening surface portion 45, so that the rubber enters the fixing portion 43. To prevent.

  As shown in FIG. 5, since the non-fastening surface portion 45 dropped through the step portion is provided around the fastening surface portion 44 where the fixing portion 43 is formed, the cavity of the molding die is formed when the main rubber 50 is molded. The non-fastening surface portion 45 can act as a seal surface portion that seals the intrusion of the rubber that is about to enter the fixing portion 43 from inside 74, and the occurrence of rubber burrs in the fixing portion 43 can be prevented.

  Thus, although the non-fastening surface portion 45 is pressed against the pressing portion 72e of the intermediate mold 72, the object to be pressed is not a portion attached to the vehicle body. It does not affect the conclusion.

  As shown in FIG. 6, when viewed from the axial direction of the absorber rod 2 (see FIG. 2), the die-cutting direction of the intermediate mold 72 for vulcanizing the projection 58 (see FIG. 4) (the vertical direction in FIG. 6, That is, the intermediate mold 72-1 is aligned with the lower side of FIG. 6, the intermediate mold 72-2 is aligned with the upper side of FIG. 6 and the extending direction of the protrusion 58 (see FIG. 4). The width of the projecting portion 58 (see FIG. 4) in the split surface direction (left and right direction in FIG. 6) is narrowed according to the separation from the longitudinal direction of the projecting portion 58 (see FIG. 4). The vertical direction of FIG. 6 (that is, the intermediate mold 72-1 is the lower side of FIG. 6 and the intermediate mold 72-2 is the upper side of FIG. 6) is set in the same direction, and the straight portion 60 is vulcanized by the intermediate mold 72. Molded.

Therefore, as shown in FIGS. 5 and 6, the intermediate mold 72 can be removed without forcibly removing the width in the split surface direction (left and right direction in FIG. 6) of 58 (see FIG. 4). Therefore, the workability of the dividing work of the intermediate mold 72 is improved, so that the mold release property of the intermediate mold 72 for molding the protrusion 58 (see FIG. 4) can be improved. 4) is formed in a wave shape when viewed from the arc side main body rubber portion 56 side (the front side in FIG. 3) in the direction orthogonal to the axis of the absorber rod 2.

  The extending direction (longitudinal direction) of the crest 58b (see FIG. 3) forming a part of the wave shape of the lower surface 58a (see FIG. 4) of the projection 58 is the opposing direction of the pair of arc portions 24, 24 ( 5 is the left-right direction in FIG. 6 and the right-and-left direction in FIG. 6). On the other hand, the intermediate mold 72 is removed in the opposite direction of the pair of straight portions 23, 23 (from the front of FIG. is there.

  Therefore, the extending direction (longitudinal direction) of the crest 58b (see FIG. 3) and the removal direction of the intermediate mold 72 do not coincide with each other. Therefore, when the intermediate mold 72 is removed, the lower surface 58a (see FIG. 4), the intermediate mold 72 is forcibly removed.

  However, the protrusion 58 (see FIG. 4) is more easily elastically deformed due to an increased amount of rubber than the rubber portion of the arc-side main body rubber portion 56 (see FIG. 4) excluding the protrusion 58 (see FIG. 4). Yes.

  Therefore, even when the intermediate mold 72 is forcibly removed, the mold release performance is improved by the elasticity of the projections 58, so that the workability of the dividing work of the intermediate mold 72 can be improved.

  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the case where the bottom surface 58a of the projection 58 is formed in a wave shape when viewed from the arc portion 24 side (right side in FIG. 4) in the direction orthogonal to the axis of the absorber rod 2 has been described. The lower surface 158a of the protrusion 158 in the second embodiment is formed in a wave shape when viewed from the straight portion 23 side (the front side in FIG. 7B) in the direction orthogonal to the axis of the absorber rod 2. In addition, the same code | symbol is attached | subjected to the part same as above-described 1st embodiment, and the description is abbreviate | omitted.

  7A is an enlarged front view of the protrusion 158 of the strut mount 101, and FIG. 7B is an enlarged cross-sectional view of the strut mount 101, which corresponds to FIG. 4 of the first embodiment. It is.

  As shown in FIGS. 7A and 7B, the strut mount 101 includes an arc-side straight portion 161 having a first straight portion 162 on the outer peripheral side and a second straight portion 163 on the inner peripheral side. . The second curb portion 163 is formed continuously with the inner peripheral portion 163a on the cylindrical portion 22 side and the lower end of the inner peripheral portion 163a, and is below the upper surface 53a of the protrusion main body rubber portion 53 (FIG. 7A). And a lower surface 163c set below (below FIG. 7B) and an upper end of the inner peripheral portion 163a, and above the lower surface 158a of the projection 158 (see FIGS. 7A and 7B). and an upper surface portion 163b set above (b).

  As shown in FIG. 7B, the lower surface portion 163c is formed in an arc shape when viewed from the side of the linear portion 23 (the front side of FIG. 7B) in the direction orthogonal to the axis of the absorber rod 2. In addition, the upper surface portion 163b is formed in an L shape.

  As shown in FIGS. 7A and 7B, the strut mount 101 includes a main body rubber 150, and the main body rubber 150 projects from the bottom surface of the arc-side main body rubber portion 156 from the protruding main body rubber portion 53. A protrusion 158 is provided on the upper surface 53a side.

  The lower surface 158a of the projecting portion 158 is formed in a wave shape when viewed from the side of the straight portion 23 in the direction orthogonal to the axis of the absorber rod 2 (the front side of FIG. 7B).

  That is, as shown in FIG. 7B, the extending direction (longitudinal direction) of the crest 158b forming a part of the wave shape of the lower surface 158a of the projection 158 is the opposite of the pair of linear portions 23, 23. In contrast to the direction (FIG. 7 (b) from the front of the page to the back), the intermediate mold 72 is removed from the opposite direction of the pair of straight portions 23 and 23 (FIG. 7 (b) from the front of the page to the back). It is.

  Therefore, since the extending direction (longitudinal direction) of the peak portion 158b and the removal direction of the intermediate mold (not shown) coincide with each other, the intermediate mold (not shown) can be removed without forcibly removing it. In addition, the workability of the mold dividing work of the intermediate mold (not shown) is improved. Therefore, the demoldability can be further improved as compared with the first embodiment.

  In addition, as shown in FIG. 7B, the lower surface 158a of the projecting portion 158 is opposed to the pair of arc portions 24, 24, that is, in the left-right direction of the vehicle body (the left-right direction in FIG. 7B). The ridges 158b having the same height are continuously formed in a wave shape.

  Further, the inner end 158 a 1 of the protrusion 158 is set at a position where it overlaps with the lower surface portion 163 c of the second straight portion 163 in the axial direction of the absorber rod 2.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  In the above-described embodiment, the description has been given of the case where the protruding portion 58 is protruded at the most protruding portion in the direction orthogonal to the axis of the absorber rod 2 of the arc side main body rubber portion 56 (the left-right direction in FIG. 1). However, the protrusion 58 may be formed on the entire arc-shaped outer edge of the arc-side main body rubber portion 56.

  In addition, although the inner edge of the protrusion 58 is formed in a straight line, it may be formed in an arc along the arc-side main body rubber part 56.

  Further, the linear portion 23 is formed in a straight line in the direction in which the outer edge connects the pair of circular arc portions 24, 24. You may form in circular arc shape so that the width | variety of a split surface direction (FIG. 6 left-right direction) may become narrow according to separation from.

  In addition, the curvature of the inner peripheral portion 64a (see FIG. 2) of the straight side straight portion 64 and the curvature of the inner peripheral portion 63 of the second straight portion 63 of the arc side straight portion 61 are set to be the same. The curvature of the inner peripheral portion 64a (see FIG. 2) of the portion 64 (see FIG. 2) may be set larger than the curvature of the inner peripheral portion 63a of the second curving portion 63. Thereby, it can prevent that the connection part 52 of the main body rubber | gum 50 generate | occur | produces from the inner peripheral part 64a of the straight side straight part 64, and the durability of the strut mount 1 can be improved.

It is a top view of the strut mount of a first embodiment of the present invention. It is sectional drawing of the strut mount in the II-II line | wire of FIG. FIG. 3 is a front view of the strut mount as viewed from the direction of arrow III in FIG. 1. It is the A section expanded sectional view of FIG. It is sectional drawing in the circular arc part of a shaping | molding die. FIG. 6 is a plan view of the first inner metal fitting and the intermediate mold when the intermediate mold is viewed from the axial direction of the absorber rod in a state where the upper mold of the mold is removed. The strut mount of 2nd embodiment of this invention is shown, (a) is the elements on larger scale of the projection part of a strut mount, (b) is an expanded sectional view of a strut mount. It is a front view of the conventional strut mount. It is a top view of the strut mount seen from the arrow IX direction of FIG. FIG. 10 is a cross-sectional view of the strut mount taken along line XX in FIG. 9.

1,101 Strut mount (anti-vibration device)
2 Absorber rod 20 1st inner metal fitting (inner member)
21 Fixed surface (inner cylinder)
22 Tube (inner tube)
24 Arc part (flange part)
40 Outer bracket (outer member)
41 Outer cylinder part 42 Protrusion part 43 Fixing part 50 Main body rubber 53,153 Protrusion main body rubber parts 53a, 153a Upper surface (contact surface)
56,156 Arc side body rubber part (flange body rubber part)
58,158 Protrusions 58a, 158a Lower surface (contact surface)
60,160 Straightening part 61,161 Arc side straightening part (straightening part)
62,162 First curving part (the curling part on the inner cylinder side from the projecting part)
63, 163 Second curving portion (curling portion in the protruding portion)
62a, 162a Inner periphery 70 Intermediate mold 72c

Claims (3)

An inner member to which the absorber rod is fixed, an outer member that is disposed outside the inner member and is fixed to the vehicle body, and a straight portion that is a gap disposed between the inner member and the outer member And a main body rubber for connecting the inner member and the outer member by being interposed between the inner member and the outer member.
The inner member has a cup-shaped inner cylinder portion that is open in a direction away from the outer member in the axial direction of the absorber rod while the absorber rod is fixed;
A pair of arc portions disposed in the left-right direction of the vehicle body , extending from the upper end of the inner cylinder portion in a direction of increasing the diameter outward of the absorber rod, and sandwiching the absorber rod A pair of flange portions facing each other,
The outer member is a cylindrical outer cylinder disposed outside the inner cylinder of the inner member;
A fixing portion fixed to the vehicle body;
Projecting from the fixed portion to the flange portion side in the axial direction of the absorber rod between the outer tube portion and the fixed portion, and outward in the radial direction of the absorber rod from the upper end portion of the outer tube portion A protrusion extending to a position overlapping at least the flange portion of the inner member in the direction of expanding the diameter,
The main rubber is a protrusion main rubber portion formed on the protrusion of the outer member;
A flange main body rubber portion formed on the flange portion of the inner member;
Of the flange main body rubber portion in the pair of arc portions, the portion that protrudes most in the left-right direction of the vehicle has a certain width and extends in the front-rear direction of the vehicle, and the flange main body rubber portion in the pair of arc portions extends from the flange main body rubber portion. A protrusion that protrudes on the protrusion main rubber portion side and abuts against the protrusion main rubber portion when the inner cylinder portion of the inner member and the outer cylinder portion of the outer member are relatively displaced in a direction approaching each other. With
The curb portion has an arcuate inner peripheral portion extending in the front-rear direction of the vehicle body as viewed from a direction orthogonal to the axis of the absorber rod on the inner tube portion side from the projection portion. The vertical dimension of the arc-side straight part on the inner cylinder part side from the protrusion is set larger than the vertical dimension of the arc-side straight part on the protrusion ,
The longitudinal direction of the protruding portion and the die-cutting direction of the intermediate mold for vulcanizing the protruding portion are set in the same direction, and the arc-side straight portion is vulcanized and molded by the intermediate mold,
The protrusion is formed such that the width in the split surface direction becomes narrower as it is separated from the split surface of the intermediate mold, so that the end located on the front and rear sides of the vehicle as compared with the center side of the protrusion Formed so that the side is narrow,
By enlarging the inner peripheral side of the arc-side curled portion in the direction of the split surface according to the separation from the split surface of the intermediate mold, the arc-side curled portion becomes wider on the front and rear sides of the vehicle that are separated from the split surface. An anti-vibration device that is formed as described above . The protrusion and the protrusion abutting surface claim 1 Symbol placement of the anti-vibration apparatus is characterized in that the corrugated shape of the main body rubber.   The vibration isolator according to claim 1 or 2, wherein the abutment surface on the protrusion side is formed in a wave shape, and the abutment surface on the protrusion main body rubber side is formed in a flat shape.

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